DE102019130728B3 - Pair of link plates for a link chain of a belt drive - Google Patents

Abstract

The invention relates to a pair of plates (1) for a plate chain (2) of a belt drive (3), having a front plate (4) and a rear plate (5), the plates (4, 5) together forming an eyelet (6), through which a pair of rocker pressure pieces (7) can be passed and the pair of plates (1) connects a tensile force (8) to each other in a transferring manner, the link chain (2) forming a closed looping circle (9) in use, the pair of rocker pressure pieces (7) at least one projection (10,11) with extension in the chain running direction (12) of the link chain (2) for axially securing the rocker pressure piece pair (7) in the eyelet (6), the links (4,5) being inclined relative to one another with a kink angle (15) and a kink angle (15) inwardly to the closed looping circle (9) is designated as positive and outwardly as negative. The pair of tabs (1) is primarily characterized in that the eyelet (6) is open at a predetermined negative buckling angle (16) and is otherwise closed, the pair of rocker pressure pieces (7) being removable only from the opened eyelet (6) The pair of tabs or rocker pressure piece proposed here provides increased security against loss, with no excessive welding energy with the risk of inadmissibly large heat affected zones on the rocker pressure piece being required.

Description

The invention relates to a pair of link plates for a link chain of a belt drive, a rocker pressure piece for a rocker pressure piece pair of a link chain, a rocker pressure piece pair with such a rocker pressure piece for a link chain of a belt drive, a plate chain with such a rocker pressure piece pair for a belt drive of a chain link chain, a belt drive a drive train, as well as a drive train with such a belt transmission. The invention also relates to an assembly method for a pair of link plates and a securing method for a link plate chain.

From the prior art, rocker pressure pieces for a rocker pressure piece pair of a link chain are known as belt means for belt transmissions, for example a so-called CVT [continuously variable transmission], as traction means. Such a CVT is, for example, from DE 100 17 005 A1 known. Such a link chain is set up for the transmission of high torques and high speeds, as are known, for example, from engine construction for motor vehicles. Because the gear noises are unusual and are generally perceived as annoying, it is a constant challenge to create a plate-link chain that emits as little noise as possible. At the same time, however, a long service life of the link chain, freedom of exchange as possible over the service life of a motor vehicle, and a high degree of efficiency are aimed for. Furthermore, the aim is to achieve the smallest possible effective circles (i.e. diameters effective for the transmission) on the conical pulley pairs of a belt drive, so that a large transmission ratio can be achieved in a small (radial) installation space. A link chain with rocker pressure pieces is for example from WO 2016/095 913 A1 or from DE 10 2018 132 382 A1 known.

The rocker pressure pieces or the tabs have previously been secured via welded-on securing elements, for example a welded-on thin wire. This prevents the rocker pressure pieces from falling out of the link assembly of the link chain or the outer link plates from falling. In individual cases, however, this securing method fails, that is, rocker pressure pieces can either fall off during production, during transport, when installing the link chain in the belt drive, or over running time due to insufficient shear strength. A missing rocker pressure piece usually leads to an early failure with breakdown at the end customer. One possible solution is to provide a larger welded connection between the securing element (for example wire) and the rocker pressure piece. This increases the strength and thus reduces the risk of lost rocker pressure pieces, but the increase in welding energy required for this increases the risk of impermissible heat-affected zones on the rocker pressure piece. Another method that is frequently used in practice with link chains is the caulking (plasticizing) of the pin ends of the rocker pressure pieces on both sides. However, there is usually no press fit with link chains. A significantly higher degree of deformation would therefore be required to ensure that no rocker pressure piece or tab is lost. Because the rocker pressure pieces have a very high degree of hardness, such high degrees of deformation cannot be implemented, or at least not cost-effectively.

Proceeding from this, the present invention is based on the object of at least partially overcoming the disadvantages known from the prior art. The features according to the invention emerge from the independent claims, for which advantageous configurations are shown in the dependent claims. The features of the claims can be combined in any technically meaningful manner, in which case the explanations from the following description and features from the figures, which include additional embodiments of the invention, can also be used.

The invention relates to a pair of link plates for a link chain of a belt drive
a front flap and a rear flap,
the plates jointly forming an eyelet through which a pair of rocker pressure pieces can be passed and the pair of plates connects a tensile force to one another in a manner that transmits a tensile force, the plate chain forming a closed looping circle when in use,
wherein the rocker pressure piece pair has at least one projection with extension in the chain running direction of the link chain for axially securing the rocker pressure piece pair in the eyelet,
wherein the tabs can be inclined relative to one another with a kink angle and a kink angle inwardly to the closed looping circle is designated as positive and outwardly as negative.

The pair of tabs is primarily characterized in that the eyelet is open at a predetermined negative kink angle and is otherwise closed, the rocker pressure piece pair being removable only from the opened eyelet.

Ordinal numbers used in the preceding and following description are used unless explicitly indicated to the contrary is pointed out, only for the sake of clear distinctness and do not reflect any order or ranking of the components identified. An ordinal number greater than one does not necessarily mean that another such component must be present.

The spatial directions used here are defined for the use of a plate-link chain in a belt drive. The radial direction is defined on the looping circle formed by a link chain, this shape being usually oval in use, i.e. two centers (with the axes of rotation of the conical pulley pairs) are formed, which are connected by a center line. The radial direction is defined as positive, starting from the center line (within the circle of wrap) and running outwards (to the outside of the circle of wrap). Inside the circle of wrap is referred to here as radially inside and outside of the circle of wrap is referred to here accordingly as radially outside. The third spatial direction is the chain running direction, which in use depends on the location in the looping circle and thus the three spatial directions mentioned here are to be viewed as a co-moving coordinate system, which is also individually defined for a (separate) component, for example in the respective center of gravity.

In the pair of link plates of a link chain proposed here, an eyelet is formed between a front and a rear link plate which has an opening size that is dependent on the bending angle present. At a predetermined negative kink angle, the eyelet is shaped in such a way that a rocker pressure piece pair with at least one projection can be removed from the eyelet. The projection is preferably formed in advance on the rocker pressure piece pair and the rocker pressure piece pair can be guided into the eyelet at the predetermined negative kink angle. At an angle deviating from the predetermined negative buckling angle, at least at a buckling angle equal to or greater than zero, the rocker pressure piece pair cannot be removed (non-destructively). When used in a belt drive, the link chain has a ring shape which forms the closed loop loop in which a negative bending angle does not occur or (for example in the case of strand vibrations) does not exceed a known negative bending angle limit. The predetermined negative articulation angle is greater than a permissible negative articulation angle during operation, that is to say the negative limit articulation angle. The eyelet is composed of two overlapping half-eyelets, for example a first front half-eyelet of the first tab of the pair of tabs and a second rear half-eyelet of the second tab of the pair of tabs, the eyelet being formed closed at least in the area of the intended force-transmitting surface of the rocker pressure piece pair (the tab contact surfaces) so that a tensile force in the link chain can be introduced as a compressive force into the rocker pressure piece pair.

It should be pointed out at this point that the predetermined negative kink angle is preferably set to a preferably very narrow angular range, for example ± 1 ° [plus / minus one degree of 360 °] to a maximum of ± 5 °. Thus, the eyelet is preferably closed again in the case of a negative kink angle, which is larger in terms of amount than the predetermined negative kink angle. For example, the predetermined negative buckling angle is -20 ° [minus ten degrees of 360 °] in relation to the direction of travel of the chain, that is to say with an inclination of the pair of link plates radially outwards based on the looping circle when the link chain is in use.

It is further proposed in an advantageous embodiment of the pair of tabs that the tabs each include two half-eyelets, the half-eyelets being oval-shaped and inclined toward one another with their main axis radially outward.

The pair of tabs proposed here comprises a first (or front in the chain running direction) tab and a second (or rear) tab, which each include two half-eyelets, so that a first tab comprises a (first) front half-eyelet and a (first) rear half-eyelet, as well the second tab comprises a (second) front half-eyelet and a (second) rear half-eyelet. In one embodiment, the two tabs of a pair of tabs are identical. In one embodiment, one of the plates is longer than the other plate in the chain running direction. In a preferred embodiment, the front half-eyelets and rear half-eyelets are each made the same. In a particularly preferred embodiment, the respective front half-eyelet and the respective rear half-eyelet of a respective tab are designed to be mirrored in relation to a radial direction of the tab. The half-eyelet is oval shaped (not exclusively in the mathematically exact sense), the shape of the contacting peripheral area being adapted to the shape and movement of the tab contact surface of the respective rocker pressure piece, which is in force-transmitting contact with the half-eyelet. The half-eyelet is preferably shaped in such a way that the largest possible force-transmitting contact surface is formed between the half-eyelet and the associated rocker pressure piece at every bending angle permissible during operation. The half-eyelet has a main axis which forms the longest axis, for example an axis of symmetry, of the oval half-eyelet. In the case of a mathematically elliptical shape of the Half eyelet corresponds to the main axis of the line that runs through the focal points. This main axis is not aligned parallel to the radial direction, but inclined to it. For a predetermined negative buckling angle, it is advantageous if the main axis of the two half-eyelets of a bracket are inclined towards one another radially outward. In a preferred embodiment, when a more positive kink angle is present than the predetermined negative kink angle, the main axes of the half-eyelets forming the eyelet of the tabs of a pair of tabs are crossed and, when the predetermined negative kink angle is present, they are brought into overlap. In this embodiment, the cross section of the eyelet is at a maximum. For example, the major axes are inclined by about 10 ° [ten degrees of 360 °]. As a result of the shape of the half-eyelets, the eyelet formed by the pair of tabs is smaller at a more positive buckling angle than the predetermined negative buckling angle, so that a projection of the rocker pressure piece pair, which is formed outside the tab contact surface, overlaps with the closed eyelet and thus is a rocker pressure piece pair or a single rocker pressure piece of a rocker pressure piece pair cannot be axially removed due to a closed eyelet.

According to an advantageous embodiment, at least one of the half eyelets deviates from perpendicular to the chain running direction in the strand, preferably both half eyelets deviate from perpendicular to the chain running direction in the strand.

• - eine Längenerstreckung, welche im Einsatz in einer Laschenkette in Axialrichtung ausgerichtet ist;
• - eine Höhenerstreckung, welche im Einsatz in einer Laschenkette in Radialrichtung ausgerichtet ist;
• - eine Breitenerstreckung, welche im Einsatz in einer Laschenkette in Kettenlaufrichtung ausgerichtet ist;
• - eine Laschenanlagefläche zum Kontakt mit einer Lasche im Einsatz in einer Laschenkette; und
• - eine Wälzfläche zum Kontakt mit einem weiteren Wiegedruckstück im Einsatz in einem Wiegedruckstückpaar,

wobei die Laschenanlagefläche zumindest einen Vorsprung umfasst,
wobei das Wiegedruckstück, bevorzugt zugleich mit dem anderen Wiegedruckstück des Wiegedruckstückpaars, mit dem Vorsprung durch die geöffnete Öse des Laschenpaars nach einer Ausführungsform gemäß der obigen Beschreibung hindurchführbar ist und in der geschlossenen Öse axial gesichert ist.According to a further aspect, a rocker pressure piece for a rocker pressure piece pair of a link chain is proposed, having at least the following components:

• - a length extension which is aligned in the axial direction in use in a link chain;
• - a vertical extension which is aligned in the radial direction in use in a link chain;
• - A width extension which, in use in a link chain, is aligned in the chain running direction;
• - A plate contact surface for contact with a plate in use in a plate link chain; and
• - a rolling surface for contact with another rocker pressure piece in use in a rocker pressure piece pair,

wherein the tab contact surface comprises at least one projection,
wherein the rocker pressure piece, preferably at the same time as the other rocker pressure piece of the rocker pressure piece pair, can be passed with the projection through the open eyelet of the pair of tabs according to an embodiment as described above and is axially secured in the closed eyelet.

The rocker pressure piece proposed here can be used in a rocker pressure piece pair with another rocker pressure piece. The two rocker pressure pieces of a rocker pressure piece pair are each in force-transmitting contact with their rolling surface and, when used in a link chain, their plate contact surfaces are in force-transmitting contact with one (other) associated plate. It should be pointed out at this point that the entire surface is referred to in the respective extension as a rolling surface or as a plate contact surface, even if there, for example for geometric reasons, no such eponymous force transmission takes place. This applies in particular to the end sections of the respective rocker pressure piece which protrude from the axial overlap area with the tabs of an axial tab group. The extension of the tab contact surface there is also referred to herein as the tab contact surface.

A rocker pressure piece has a longitudinal extension which, in use, is parallel to the axial direction. The axial direction is defined as a direction parallel to the axes of rotation of the cone pulley pairs. The link plates of a link chain are suspended adjacent to one another in the axial direction on the rocker pressure piece pair or the majority of the rocker pressure piece pairs of the link chain. Furthermore, the rocker pressure piece has a vertical extent which is parallel to the radial direction. The width of the rocker pressure piece is parallel to the chain running direction. In a preferred embodiment, a rocker pressure piece has an approximately teardrop-shaped cross section (with the axial direction as the normal), the rocker pressure piece being narrow radially on the outside and wider radially on the inside. The two rocker pressure pieces of a rocker pressure piece pair together form an oval shape. The shape of the (open) eyelet of the respective pair of tabs is based on this oval shape and the projection. The height extension is defined as the maximum extension in the radial direction and the width extension as the maximum extension in the chain running direction (in a straight section of the link chain, i.e. in use in the ideally tensioned strand).

At the axial end, that is to say in a view in the axial direction, an end face is provided in each case, which is set up in force-transmitting, preferably frictional, contact with the corresponding (conical) surface of the conical disk pairs.

It is now proposed here that the rocker pressure piece has at least one projection on its tab contact surface. This projection is designed in such a way that it rises out of the plate contact surface in the chain running direction, so that an axial movement of the rocker pressure piece is not possible during use because the projection collides axially with the (closed) eye of the plate pair. The projection is designed so small at the same time that the rocker pressure piece can be axially passed through when the eyelet is open. Such a projection is preferably arranged radially outside of the rocker pressure piece (based on the looping circle when the link chain is in use), the eyelet further narrowing radially outside (i.e. in the area of the projection) at a positive kink angle compared to a zero position and / or the half-eyelets of a tab are connected to an opening, for example to save weight, and such a projection must always remain outside such an opening.

It is further proposed in an advantageous embodiment of the rocker pressure piece that the at least one projection is arranged to terminate axially at the end, preferably on both sides.

In this advantageous embodiment, it is proposed that such a projection is only arranged to close axially at the end. This has the advantage that a rocker pressure piece, which is always the same, at least with regard to the projection, can be used for a rocker pressure piece pair and / or for the entire link chain, without taking into account the arrangement of the axially adjacent link plates, which are usually over the course of the Link chain is designed differently.

In one embodiment, such a pair of tabs is formed only on one end side of the axially adjacent tabs in relation to a rocker pressure piece pair (a group of tabs), preferably on both sides of such a group of tabs.

In one embodiment, a rocker pressure piece is designed on one end side with a bolt head which cannot be passed through an open eye either. In a preferred embodiment, such a projection is provided on both sides, particularly preferably an identical projection, so that two identical rocker pressure elements (inserted mirrored on their rolling surface) can be used in a rocker pressure piece pair.

In one embodiment, a rocker pressure piece pair is designed with such a rocker pressure piece and another type of rocker pressure piece. For example, the different type of rocker pressure piece can first be inserted into the, preferably open, eyelet and then the rocker pressure piece according to the above description with the projection can then be introduced into the opened eyelet.

It is also proposed in an advantageous embodiment of the rocker pressure piece that the rocker pressure piece is formed in one piece, preferably by means of massive deformation.

In this advantageous embodiment, the axial securing of the rocker pressure piece or the rocker pressure piece pair is particularly robust because the projection is connected particularly firmly to the rest of the material of the respective rocker pressure piece. By means of a preferred manufacturing method comprising massive deformation to form at least the at least one projection, a solidification of the material is also achieved, so that a high strength is nevertheless achieved with a projection with a small cross section. This allows the mass and / or the dimensions of the link chain to be significantly reduced compared to a conventional link chain with welded-on securing means. If the cradle pressure piece is reshaped with thermal influence, this can be carried out before the mounting of the rocker pressure piece in the pair of tabs, so that hardening and / or tempering, which may be necessary, can be carried out after the (thermal) formation of a projection. Such a projection is preferably formed by means of cold forming, for example extrusion, particularly preferably before hardening and / or tempering of the rocker pressure piece.

According to a further aspect, a rocker pressure piece pair for a link chain of a belt drive is proposed, comprising two rocker pressure pieces according to an embodiment according to the above description, wherein the rocker pressure piece pair with the projections can be passed through the open eye of the plate pair according to an embodiment according to the above description and in the closed one Eyelet is secured axially.

The pair of rocker pressure pieces proposed here comprises two rocker pressure pieces according to an embodiment according to the preceding description, that is to say two projections are formed on the rocker pressure piece pair. The pair of rocker pressure pieces is preassembled before it is inserted into the opened eyelet, so that the axial extent of the pair of rocker pressure pieces in the chain running direction is already very large. Alternatively, a rocker pressure piece is already installed and a second rocker pressure piece is then inserted into the opened eyelet.

• - eine Vielzahl von Laschen, wobei zumindest ein Laschenpaar, bevorzugt ausschließlich Laschenpaare, nach einer Ausführungsform gemäß der obigen Beschreibung umfasst ist; und
• - eine korrespondierende Anzahl von Wiegedruckstückpaaren, bevorzugt nach einer Ausführungsform gemäß der obigen Beschreibung,

wobei mittels der Laschenkette ein Drehmoment zwischen einem ersten Kegelscheibenpaar und einem zweiten Kegelscheibenpaar reibschlüssig übertragbar ist,
wobei bevorzugt ein Übersetzungsverhältnis zwischen den Kegelscheibenpaaren stufenlos veränderbar ist.According to a further aspect, a link chain for a belt drive of a drive train is proposed, having at least the following components:

• a multiplicity of tabs, at least one pair of tabs, preferably exclusively pairs of tabs, being included according to one embodiment as described above; and
• - a corresponding number of rocker pressure piece pairs, preferably according to an embodiment according to the description above,

wherein by means of the link chain, a torque between a first pair of conical disks and a second pair of conical disks can be transmitted in a frictionally engaged manner,
wherein a transmission ratio between the conical pulley pairs is preferably continuously variable.

The link chain proposed here is set up as a traction device for a belt drive, for example for a CVT. In the case of a belt drive, a link chain forms a loop section on the transmission shafts and two strands between them, one being a tension strand or load strand and the other being a slack strand. The strands and the looping circle sections together form an (oval) looping circle, as explained above. As far as a circle of wrap is spoken of, this does not mean a circle with a constant radius, but a circumferentially closed structure. The shape is defined by the effective circles (set by means of a pulley spacing) of the conical pulley pairs of the belt drive. The spatial directions are also defined here as explained above.

The link chain has a chain width and over this chain width a plurality of link plates are generally arranged adjacent to one another and form a link plate group. In use, the chain width is aligned parallel to the alignment of the at least two transmission shafts. The chain width is defined by the width of the rocker pressure pieces, with the (axial) ends of the rocker pressure pieces protruding beyond the adjacent plates so that the plates do not come into frictional contact with the corresponding surface of the conical pulley pairs.

The link chain comprises a plurality of link plates, a plurality of link plate types preferably being provided for reduced noise emissions (as explained above), for example two link plate types, namely a short link plate and a long link plate. The straps connect two pairs of rocker pressure pieces to transmit tensile force. A rocker pressure piece pair has a fixed rocker pressure piece and a free rocker pressure piece in relation to a bracket. Two tabs are each connected to one another by means of a common pair of rocker pressure pieces in a manner that transmits tensile force, the designation as free or fixed rocker pressure piece then being reversed in each case for the other tab. The two rocker pressure pieces of a rocker pressure piece pair lie directly against each other in a force-transmitting manner due to the tensile force transmitted by the link plates of the link chain during operation of the belt drive and thus the link load acting on the rocker pressure piece pair (on both sides in the chain running direction). The two rocker pressure pieces of the rocker pressure piece pair transmit the tensile force of the tabs as a compressive force to each other and roll off each other during the movement in a belt transmission by means of their force-transmitting rolling surfaces lying against each other. The rolling surfaces are curved or kinked and thus describe a rocking movement on each other when the belt drive is in operation.

In a preferred embodiment, the link chain is set up as a belt for a continuously variable transmission and the end faces of the rocker pressure pieces of the link chain are in force-transmitting contact with the corresponding (conical) surfaces of the conical pulley pairs.

With the link chain proposed here, increased security against losing a rocker pressure piece and / or a link plate can be achieved. At the same time, the link chain or a link pair of the link chain is simple and can be mounted (secured) preferably without thermal impairment of the rocker pressure piece. The link chain proposed here can be used to replace a conventional link chain without additional measures.

• - ein erstes Kegelscheibenpaar mit einer ersten Rotationsachse und mit einem veränderbaren axialen ersten Scheibenabstand;
• - ein zweites Kegelscheibenpaar mit einer zweiten Rotationsachse mit einem veränderbaren axialen zweiten Scheibenabstand; und
• - eine Laschenkette nach einer Ausführungsform gemäß der obigen Beschreibung, wobei die beiden Kegelscheibenpaare mittels der Laschenkette, welche als in Richtung der Breitenerstreckung in jeweils einem Kegelscheibenpaar axial eingepresstes Zugmittel angeordnet ist, mit einem Übersetzungsverhältnis, welches von den eingestellten Scheibenabständen abhängig ist, drehmomentübertragend miteinander verbunden sind,

wobei bevorzugt das Übersetzungsverhältnis zwischen den Kegelscheibenpaaren stufenlos veränderbar ist.According to a further aspect, a belt transmission for a drive train is proposed, having at least the following components:

• - A first pair of conical disks with a first axis of rotation and with a variable axial first disk spacing;
• - A second pair of conical disks with a second axis of rotation with a variable axial second disk spacing; and
• A plate-link chain according to an embodiment according to the above description, the two pairs of conical pulleys being arranged by means of the plate-link chain as traction means axially pressed into a pair of conical pulleys in the direction of the widthwise extension are connected to each other in a torque-transmitting manner with a transmission ratio that is dependent on the set pulley spacings,

wherein the transmission ratio between the conical pulley pairs is preferably continuously variable.

The belt drive is set up for a drive train, for example a motor vehicle, and comprises at least one first pair of conical disks arranged on a first transmission shaft, for example the transmission input shaft, and a second conical disk pair arranged on a second transmission shaft, for example the transmission output shaft, as well as one for torque transmission between the conical disk pairs provided belt means, namely the link chain described above. A conical disk pair comprises two conical disks, which are aligned with corresponding (conical) surfaces and are axially movable relative to each other. In a preferred embodiment, the (first) conical disk, also referred to as a loose disk or movable disk, is displaceable (axially displaceable) along its axis of rotation and the (second) conical disk, also referred to as a fixed disk, is fixed (axially fixed) in the direction of the axis of rotation. This allows the respective disc spacing of the respective conical disc pair to be changed.

When the belt drive is in operation, the link chain is moved between an inner position (small or minimum effective circle) and an outer position (large or maximum effective circle) in a (based on) due to the (conical) surfaces of the two conical pulleys by means of a relative axial movement of the conical disks of a conical pulley pair the respective axis of rotation) shifted in the radial direction. The link chain thus runs on a variable effective circle, i.e. with a variable running radius. As a result, a different speed ratio and torque ratio can be set from one pair of conical pulleys to the other pair of conical pulleys, preferably continuously.

The belt drive proposed here has a plate-link chain as described above, the cradle pressure pieces of the plate-link chain ensuring operational safety even with high axial forces (shear forces) due to the eye being closed during operation by means of the projection. The loss of a rocker pressure piece and / or a link plate of the link chain is excluded if the system is used as intended.

• - zumindest eine Antriebsmaschine;
• - zumindest einen Verbraucher; und
• - ein Umschlingungsgetriebe nach einer Ausführungsform gemäß der obigen Beschreibung,

wobei die zumindest eine Antriebsmaschine zur Drehmomentübertragung mittels des Umschlingungsgetriebes mit dem zumindest einen Verbraucher mit veränderbarer Übersetzung verbunden ist.According to a further aspect, a drive train is proposed having at least the following components:

• - at least one prime mover;
• - at least one consumer; and
• - a belt drive according to an embodiment according to the description above,

wherein the at least one drive machine for torque transmission is connected to the at least one consumer with a variable ratio by means of the belt drive.

The drive train, for example of a motor vehicle used to propel it via at least one propulsion wheel (consumer), is set up to include one of one or a plurality of drive machines, for example an internal combustion engine and / or an electrical machine, provided and via its respective drive shaft, for example that is, the combustion shaft and / or the rotor shaft, to transmit torque output for use by a consumer as required, that is, taking into account the required speed and the required torque. One use is, for example, an electrical generator to provide electrical energy or the transmission of torque to a propulsion wheel of a motor vehicle for propulsion.

In order to transmit the torque in a targeted manner and / or by means of a gearbox with different gear ratios, the use of the belt drive described above is particularly advantageous because the link chain enables a very high degree of torque transmission efficiency. The link chain proposed here also has a particularly high level of failure safety with a high transmittable torque, because the loss of a rocker pressure piece and / or a link is excluded in the operation of the belt drive according to the design.

1. a. Bereithalten des zumindest einen Laschenpaars nach einer Ausführungsform gemäß der obigen Beschreibung mit dem vorbestimmten negativen Knickungswinkel;
2. b. Einschieben und axiales Positionieren des Wiegedruckstückpaars, bevorzugt nach einer Ausführungsform gemäß der obigen Beschreibung, in die geöffnete Öse; und
3. c. Überführen des Laschenpaars in einen von dem vorbestimmten negativen Knickungswinkel abweichenden Knickungswinkel, bevorzugt in einen Knickungswinkel von null oder einen positiven Knickungswinkel.

According to a further aspect, an assembly method for a pair of tabs according to an embodiment according to the description above is proposed, the assembly method comprising at least the following steps in the order mentioned:

1. a. Holding ready the at least one pair of tabs according to an embodiment as described above with the predetermined negative kink angle;
2. b. Insertion and axial positioning of the rocker pressure piece pair, preferably according to an embodiment according to the description above, into the opened eyelet; and
3. c. Transferring the pair of tabs to a kink angle deviating from the predetermined negative kink angle, preferably to a kink angle of zero or a positive kink angle.

The assembly method proposed here for a pair of tabs allows a simple, safe and inexpensive assembly, wherein a rocker pressure piece pair with high shear strength can be used to prevent a tab and / or a rocker pressure piece from being lost. The assembly process can be carried out for a pair of link plates, preferably for most or all of the link plate pairs of a link chain. The assembly method can preferably be carried out repeatedly one after the other for a plurality of pairs of tabs simultaneously and / or in a flow production in close intervals.

In step a. the predetermined negative kink angle is set, preferably for all plate pairs of a plate group at the same time, so that according to step b. a rocker pressure piece or a rocker pressure piece pair can be inserted into the then opened eyelet without collision. The eyelet is then closed by in step c. a kink angle deviating from the predetermined negative kink angle is set, and is preferably fixed or secured until assembly. As an alternative, the predetermined negative kink angle is always set precisely for carrying out the rocker pressure piece or the rocker pressure piece pair and is preferably closed again immediately afterwards. In this respect, step a is considered for a group of tabs. and step b., as well as step c. carried out wandering in the axial direction through the group of tabs belonging to the rocker pressure piece pair. So with a first pair of tabs in the axial direction, step c. is completed, step b for the adjacent (second) pair of flaps. is carried out and for an adjacent (third) pair of tabs, step a. is carried out or is. The assembly process has not yet started for the (possibly existing) other adjacent pairs of tabs in the group of tabs.

1. i. mittels eines Sicherungsmittels Halten der vormontierten Laschenkette in einer Form, in welcher bei dem zumindest einen Laschenpaar nach einer Ausführungsform gemäß der obigen Beschreibung das Vorliegen des vorbestimmten negativen Knickungswinkels ausgeschlossen ist, bevorzugt in einem Knickungswinkel von null oder in einem positiven Knickungswinkel gehalten ist;
2. ii. Montieren der Laschenkette auf einem Umschlingungsgetriebe, bevorzugt nach einer Ausführungsform gemäß der obigen Beschreibung, wobei die Laschenkette auf dem Umschlingungsgetriebe derart vorgespannt wird, dass das Vorliegen des vorbestimmten negativen Knickungswinkels ausgeschlossen bleibt; und
3. iii. Entfernen des Sicherungsmittels.

According to a further aspect, a securing method for a link chain according to an embodiment according to the above description is proposed, the securing method comprising at least the following steps in the order mentioned:

1. i. by means of a securing means holding the preassembled link chain in a form in which the presence of the predetermined negative buckling angle is excluded in the at least one pair of link plates according to an embodiment according to the description above, is preferably held at a buckling angle of zero or at a positive buckling angle;
2. ii. Mounting the link chain on a belt drive, preferably according to an embodiment according to the above description, wherein the link chain is pretensioned on the belt drive in such a way that the presence of the predetermined negative bending angle is excluded; and
3. iii. Removal of the securing means.

The securing method proposed here for a plate-link chain allows simple handling and transport of the plate-link chain, with no risk of the plate-link chain dismantling itself due to an unintentional presence of the predetermined negative kink angle.

In a preferred embodiment, the link chain is already in or before step i. closed to the final circle of wrap. The securing means is, for example, an oval in the shape of a later assembly, for example for a minimum effective circle and a maximum effective circle or equally large effective circles on the two pairs of conical pulleys of the belt, in which state the link chain is to be installed. The step i. is therefore carried out over a fairly long period of time after completion of production, before preparation for transport or before removal from a means of transport (for example a package). In principle, the shape of the securing means is arbitrary, but an oval shape is adapted to the effective circles present in the assembly. Adapted to the effective circles means, for example, that the effective circles are smaller by the radial dimensions of the securing means, so that the link chain with the securing means can be guided onto the (respective conical pulleys of the) conical pulley pairs.

In an alternative embodiment, the link chain is until it is reached, for example completed, from step ii. not yet closed to the final circle of wrap. Rather, the link chain is open and is only closed during assembly. In this case, the (or the plurality of) plate pair (s), which are still to be connected by means of a rocker pressure piece pair, are preferably connected by means of the assembly method according to the preceding description. In this embodiment, the securing means is at least partially flexible in the radial direction, for example like the link chain itself. In contrast to the link chain, however, the link chain in the state held by means of the securing means (in step i.) Cannot be transferred into the predetermined negative buckling angle because the securing means itself or (for example, due to the collision) in Cooperation with the link chain cannot be converted into the predetermined negative kink angle.

In one embodiment, an alternative securing means is provided which does not (alone) secure the link chain in the desired form, but (additionally or only) forms an axial securing means. For example, such an alternative securing means is a preferably flexible and / or axially unilaterally applied protective film or protective hood. Step ii is preferred here. and step iii. carried out according to the backup procedure proposed here.

Step ii. is carried out according to this security method, while according to step i. the securing means still keeps the link chain in the desired shape. In an alternative (transport securing) method, the securing means is removed before assembly in a belt drive, with the link chain then being secured differently during this assembly against the presence of the predetermined negative kink angle, for example by maintaining sufficient pretensioning of the link chain in the direction of chain extension. or the rocker pressure pieces and tabs are axially secured. The chain extension direction corresponds to the chain running direction or deviates from the chain running direction because the link chain is not yet closed to form a looping circle. If the link chain is pretensioned as long as the securing means is still attached, this means, in an embodiment with the radial installation space required by the securing means and / or great rigidity of the securing means, only a preparation for pretensioning the link chain, so that after step iii. there is just such a sufficient pretensioning of the link chain that the presence of the predetermined negative buckling angle is excluded.

In step iii. the securing means is now removed. Due to the pretensioning of the link chain by means of the set effective circles on the conical pulley pairs of the belt drive, the existence of the predetermined negative buckling angle is excluded from now on and for the entire operating time.

• 1: eine Lasche mit zwei Halbösen;
• 2: ein Laschenpaar mit zwei Laschen nach 1 mit dem vorbestimmten negativen Knickungswinkel;
• 3: ein Laschenpaar mit zwei Laschen nach 1 mit einem positiven Knickungswinkel;
• 4: ein Laschenpaar mit zwei Laschen nach 1 mit einem Knickungswinkel von null;
• 5: eine für den Transport und/oder die Montage gesicherte Laschenkette; und
• 6: ein Umschlingungsgetriebe in einem Antriebsstrang.

The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way restricted by the purely schematic drawings, it being noted that the drawings are not dimensionally accurate and are not suitable for defining size relationships. It is shown in

• 1 : a tab with two half-eyelets;
• 2 : a pair of tabs with two tabs after 1 with the predetermined negative kink angle;
• 3 : a pair of tabs with two tabs after 1 with a positive kink angle;
• 4th : a pair of tabs with two tabs after 1 with a kink angle of zero;
• 5 : a link chain secured for transport and / or assembly; and
• 6th : a belt drive in a drive train.

In 1 is a tab 4th , 5 shown, with a coordinate system here (optionally in the middle of the first main axis 21 , 22nd ) is shown. The coordinate system is three-dimensional. The horizontal axis as shown describes the chain running direction 12th and the vertical axis as shown, the radial direction 14th . The axial direction 13th points into the image plane. In the axial direction 13th points the tab 4th , 5 a length extension 25th and in the radial direction 14th a height extension 26th on. The tab 4th , 5 has a first front half eyelet 17th and a first rear half eyelet 18th on. If it is a first (in the chain running direction 12th front) tab 4th acts, the right half eyelet, as shown in the illustration, is the (first) front half eyelet 17th and the left half eyelet as shown is the (first) rear half eyelet 18th . If it is the second (in the chain running direction 12th rear) tab 5 is, the left half-eye as shown is the (second) rear half-eye 20th and the right half eyelet as shown, the (second) front half eyelet 19th . From this it can be seen that the first tab 4th and the second tab 5 in this preferred embodiment are the same and the only distinction is the position in a pair of tabs 1 depends. The tab shown is preferred 4th , 5 at the same time a front flap 4th of a rear pair of tabs 1 and a rear flap 5 of a front pair of tabs 1 . The same applies to the main axes 21 , 22nd so that here unifying only from a front main axis 21 and a rear main axis 22nd is spoken. The two main axes 21 , 22nd are to the radial direction 14th run inclined, for example by 10 °, the two main axes 21 , 22nd are inclined towards one another radially outwards. For a better overview, see the following 2 to 6th the coordinate system in only the second (rear) tab 5 shown. This also applies to the first (front) flap 4th . The above description of the coordinate system also applies. For better understanding (without excluding the general public) are the two tabs 4th , 5 of the plate pair 1 in 2 to 6th executed identically.

In 2 is a pair of tabs 1 with a dashed (front) first tab 4th and a second flap shown with a solid line 5 shown. The first tab 4th has a first front half eyelet 17th and a first rear half eyelet 18th on. The second tab 5 has a second front half eyelet 19th and a second rear half eyelet 20th on. The first rear half loop 18th the first tab 4th and the second front half eyelet 19th the second tab 5 together form the eyelet 6th . This eyelet 6th is open because between the first flap 4th and the second tab 5 the predetermined negative kink angle 16 is present, which in the embodiment shown depends on the angle of inclination (for example 10 ° in each case) of the main axes 21 , 22nd depends (in this case, for example, is -20 °). In the shown (opened) eyelet 6th is a rocker pin pair 7th comprising a (right in the illustration) front rocker pressure piece 23 and a rear rocker pressure piece (on the left as shown in the illustration) 24 introduced. The front rocker pressure piece 23 has a front flap contact surface on the right in the illustration 28 and on the left a front rolling surface 30th on. The rear rocker pressure piece 24 has a rear flap contact surface on the right in the illustration 29 and on the left a rear rolling surface 31 on. The cradle pressure pieces 23 , 24 each have at least one projection 10 , 11 on, which at least on the end side of the rocker pressure pieces shown in the plane of the drawing 23 , 24 each radially on the outside of the respective tab contact surface 28 , 29 are arranged. The opened eyelet 6th forms an opening that is large enough that these protrusions 10 , 11 can be passed through without collision. This is the cradle pressure piece pair 7th this embodiment pre-assembled in the open eyelet 6th axially insertable.

In 3 is the pair of tabs 1 to 2 shown, with the pair of tabs 1 here with a positive (securing) kink angle 15th is shown. With a positive kink angle 15th is only a partial overlap of the two the eyelet (shown) 6th forming half-loops 18,19 guaranteed. The partial overlap is so smaller than the cross-sectional profile of the rocker pressure piece pair 7th so that the protrusions 10 , 11 from the (closed) loop 6th not collision-free, i.e. not non-destructive, can be axially guided out. This is the cradle pressure piece pair 7th in the eyelet 6th and so are the tabs 4th , 5 of the plate pair 1 axially secured. This is a limit state of the preferred embodiment of the tabs 4th , 5 with a breakthrough in the direction of travel of the chain 12th between the two half-loops 17th , 18th the first tab 4th or the two half-loops 19th , 20th the second tab 5 shown at which the front projection 10 of the front rocker plunger 23 with the corresponding section of the first rear half-eyelet 18th is in overlap and is thus axially secured.

In 4th is the pair of tabs 1 to 2 and 3 shown, with the pair of tabs 1 here with a different positive (securing) kink angle 15th is shown; namely is the pair of tabs 1 im (in the direction of chain travel 12th ) shown stretched state. Here, too, the partial overlap is also smaller than the cross-sectional profile of the rocker pressure piece pair 7th so that the protrusions 10 , 11 from the (closed) loop 6th not collision-free, i.e. not non-destructive, can be axially guided out. This is the cradle pressure piece pair 7th in the eyelet 6th and so are the tabs 4th , 5 of the plate pair 1 axially secured. This ensures reliable backup in all operating states.

In 5 is a plate chain 2 with pars-pro-toto two pairs of tabs 1 , each comprising a front (first) tab 4th and a rear (second) tab 5 shown. In the area of the link chain 2 a coordinate system is shown, which in the upper (first) strand as shown 42 aligned in the direction of chain travel 12th , preferably the direction of rotation of the link chain 2 , has. The radial direction 14th points radially outward of the link chain 2 formed circle of wrap 9 . The axial direction 13th points out of the picture plane. On the second run 43 shows the direction of travel of the chain 12th corresponding approximately to the left and the radial direction 14th roughly down. In the area of the (in use) effective circles of the conical pulley pairs 33 , 34 (compare 6th ) this (moving) coordinate system is aligned differently accordingly. This representation of the link chain 2 for a belt drive 3 is intended to illustrate that the individual pairs of tabs 1 secured by means of the securing means 41 , here as a rigid or sufficiently less flexible inner ring within the looping circle 9 formed, and in operation only a securing kink angle 15th (compare 3 and 4th ), so that the cradle pressure pieces are lost 23 , 24 of a rocker pressure piece pair 7th and / or a tab 4th , 5 is prevented.

In 6th is a belt drive 3 in a perspective view in a section of a drive train 32 shown in which a plate link chain 2 as a traction device on two pairs of conical pulleys 33 , 34 expires. The plate chain 2 has a chain width in the axial direction 13th (parallel to the axis of rotation) on which of the longitudinal extension 25th of the rocker pressure piece pair 7th corresponds to. Thus, a defined disc spacing 37, 38 results in interaction with the width extension 27 the plate chain 2 to a resulting effective circle on the respective conical pulley pair 33 , 34 . In this case the first is slice spacing 37 large and thus the first effective circle small and the second disc spacing 38 small and thus the second effective circle large. This is by means of the belt drive 3 from a first gear shaft 44 , for example a transmission input shaft, with a first axis of rotation 35 , to a second gear shaft 45 , for example a transmission output shaft, with a second axis of rotation 36 a torque ratio greater than 1, for example 2, is set.

The tabs are by means of the plurality of rocker pressure piece pairs 7th with each other (for the transmission of tensile force according to the tensile force shown 8th in the dreams 42,43) chained together to form a ring. There are a plurality of tabs 4th , 5 in the axial direction 13th arranged side by side. Here is a coordinate system in the first strand 42 shown, which corresponds to the coordinate system according to the previous figures. The chain running direction 12th lies in the plane of the ring of the link chain 2 . The axial direction 13th (corresponds to the direction of the chain width) is aligned parallel to the axes of rotation 35,36. The radial direction 14th points to the outside of the link chain 2 formed ring. The position of the coordinate system shown is at any point on the link chain 2 and the alignment of the chain running direction 12th and the radial direction 14th as well as the position of the axial direction 13th changes with the movement of the link chain 2 .

For example, is on the first gear shaft 44 a prime mover 39 connected, only the torque-absorbing input gear being shown here. For example, is on the second gear shaft 45 a consumer 40 , for example at least one drive wheel for a motor vehicle, connected, only the torque-emitting output gear is shown here.

With the pair of tabs or rocker pressure piece proposed here, increased security against loss is formed, with no excessive welding energy with the risk of inadmissibly large heat affected zones on the rocker pressure piece being required.

List of reference symbols

1

Pair of tabs

2

Plate chain

3

Belt drive

4th

first tab

5

second tab

6th

eyelet

7th

Cradle pressure piece pair

8th

traction

9

Looping circle

10

front ledge

11

rear ledge

12th

Chain running direction

13th

Axial direction

14th

Radial direction

15th

securing kink angle

16

predetermined negative kink angle

17th

first front half eyelet

18th

first rear half eyelet

19th

second front half eyelet

20th

second rear half eyelet

21

front main axis

22nd

rear main axis

23

front rocker pressure piece

24

rear rocker pressure piece

25th

Elongation

26th

Height extension

27

Extension of width

28

front flap contact surface

29

rear flap contact surface

30th

front rolling surface

31

rear rolling surface

32

Powertrain

33

first pair of conical disks

34

second pair of conical disks

35

first axis of rotation

36

second axis of rotation

37

first disc spacing

38

second disc spacing

39

Prime mover

40

consumer

41

Securing means

42

first dream

43

second dream

44

first gear shaft

45

second gear shaft

Claims (10)

Pair of link plates (1) for a link chain (2) of a belt drive (3) a front flap (4) and a rear flap (5), the flaps (4, 5) together forming an eyelet (6) through which a pair of rocker pressure pieces (7) can be passed and the pair of flaps (1) a tensile force (8 ) connects to each other in a transferring manner, the link chain (2) forming a closed looping circle (9) in use, the rocker pressure piece pair (7) at least one projection (10, 11) extending in the chain running direction (12) of the link chain (2) for axial securing of the rocker pressure piece pair (7) in the eyelet (6), the tabs (4, 5) being inclined relative to one another with a kink angle (15) and a kink angle (15) inwardly to the closed looping circle (9) as positive and after is labeled negative on the outside, characterized in that the eyelet (6) is open at a predetermined negative kink angle (16) and is otherwise closed, the rocker pressure piece pair (7) only being removable from the opened eyelet (6) t. Pair of tabs (1) Claim 1 wherein the tabs (4,5) each comprise two half-eyelets (17,18,19,20), the half-eyelets (17,18,19,20) being oval-shaped and with their main axis (21,22) radially outward to one another are inclined. Rocker pressure piece (23,24) for a rocker pressure piece pair (7) of a link chain (2), having at least the following components: - a length extension (25) which is aligned in the axial direction (13) in use in a link chain (2); - A vertical extension (26) which, in use in a link chain (2), is aligned in the radial direction (14); - A width extension (27) which, in use in a link chain (2), is aligned in the chain running direction (12); - A plate contact surface (28,29) for contact with a plate (4,5) in use in a plate link chain (2); and - a rolling surface (30,31) for contact with a further rocker pressure piece (24,23) in use in a rocker pressure piece pair (7), the tab contact surface (28,29) comprising at least one projection (10,11), the rocker pressure piece (23,24), preferably at the same time with the other rocker pressure piece (24,23) of the rocker pressure piece pair (7), with the projection (10,11) through the open eyelet (6) of the tab pair (1) Claim 1 or 2 can be passed through and is axially secured in the closed eyelet (6). Cradle pressure piece (23,24) after Claim 3 , wherein the at least one projection (10, 11) is arranged to terminate axially at the end, preferably on both sides. Pair of rocker pressure pieces (7) for a link chain (2) of a belt drive (3), having two rocker pressure pieces (23, 24) Claim 3 or 4th , wherein the rocker pressure piece pair (7) with the projections (10,11) through the opened eye (6) of the pair of tabs (1) Claim 1 or 2 can be passed through and is axially secured in the closed eyelet (6). Plate chain (2) for a belt drive (3) of a drive train (32), having at least the following components: a plurality of plates (4,5), with at least one plate pair (1), preferably exclusively plate pairs (1), after Claim 1 or 2 is included; and - a corresponding number of rocker pressure piece pairs (7), preferably according to Claim 5 , wherein a torque between a first pair of conical disks (33) and a second pair of conical disks (34) can be transmitted in a frictionally locking manner by means of the link chain (2), a transmission ratio between the conical disk pairs (33, 34) preferably being continuously variable. Belt drive (3) for a drive train (32), having at least the following components: - a first pair of conical pulleys (33) with a first axis of rotation (35) and with a variable axial first pulley spacing (37); - A second pair of conical disks (34) with a second axis of rotation (36) with a variable axial second disk spacing (38); and - a link chain (2) after Claim 6 , the two conical pulley pairs (33,34) being arranged by means of the link chain (2), which is arranged as traction means axially pressed into a conical pulley pair (33,34) in the direction of the widthwise extension (27), with a transmission ratio that depends on the set pulley spacings (37,38) are connected to each other in a torque-transmitting manner, the transmission ratio between the conical pulley pairs (33,34) preferably being continuously variable. Drive train (32) having at least the following components: - at least one drive machine (39); - At least one consumer (40); and - a belt drive (3) after Claim 7 , wherein the at least one drive machine (39) for torque transmission by means of the belt transmission (3) is connected to the at least one consumer (40) with a variable translation. Assembly method for a pair of tabs (1) according to Claim 1 or 2 , the assembly method comprises at least the following steps in the order listed: a. Keeping the at least one pair of tabs (1) ready Claim 1 or 2 with the predetermined negative kink angle (16); b. Insertion and axial positioning of the rocker pressure piece pair (7), preferably after Claim 5 into the open eyelet (6); and c. Transferring the pair of tabs (1) to a kink angle (15) deviating from the predetermined negative kink angle (16), preferably to a kink angle (15) of zero or a positive kink angle (15). Securing procedure for a plate link chain (2) according to Claim 6 , wherein the backup method comprises at least the following steps in the order mentioned: i. by means of a securing means (41) holding the preassembled link chain (2) in a form in which the at least one link pair (1) follows Claim 1 or 2 the presence of the predetermined negative kink angle (16) is excluded, is preferably held at a kink angle (15) of zero or at a positive kink angle (15); ii. Mount the link chain (2) on a belt drive (3), preferably after Claim 7 , wherein the link chain (2) is pretensioned on the belt drive (3) in such a way that the presence of the predetermined negative buckling angle (16) remains excluded; and iii. Remove the securing means (41).

Images