DE102008023583A1 - Control valve unit - Google Patents

Abstract

The invention is based on a control valve unit, in particular a phaser of a camshaft, with at least one first check valve (11a, 11b) arranged in a resource inlet (10a, 10b) and at least one between at least two resource connections (12a, 13a, 14a; 13b, 14b) arranged second check valve (15a, 15b). It is proposed that the two non-return valves (11a, 15a, 11b, 15b) have at least one common, moving valve element (16a, 17a, 16b, 17b).

Description

The The invention relates to a control valve unit according to the preamble of claim 1.

It is already a control valve unit, in particular a Phasenverstellvorrichtung a camshaft, with at least one in a resource inlet arranged first check valve and with at least one arranged between at least two resource connections second check valve, known.

Of the Invention is in particular the object of a control valve to realize with a simple and compact design. she will according to the invention solved by the features of claim 1. Further embodiments emerge from the dependent claims.

The The invention is based on a control valve unit, in particular one Phase adjustment device of a camshaft, with at least one in a resource inlet arranged first check valve and with at least one disposed between at least two resource ports second check valve.

It It is proposed that the two check valves at least one have common, moving valve element. This can be done on one double version of valve elements used for the check valves necessary, are dispensed with, creating a simple and compact Construction for the control valve unit can be realized. Under a "common Valve element "is intended in particular a common functional valve element of the check valves be understood, such as a common valve body, a common valve spring, a common stop means. Under "common" shall be in In this context, in particular be understood that the valve element at least partially in one piece for both check valves is trained. Under a "moving" valve element should be understood in particular a valve element, the in its entirety for a movement is provided, such as the valve body, or that carries out a movement in itself, such as the valve spring, which is intended to compress to become.

Especially It is proposed that the control unit as a valve spring for two locking elements having trained valve element. This can be a second Valve spring are dispensed with, creating a particularly simple design can be achieved. Preferably, the valve spring is integral to both check valves educated.

Further It is proposed that the control valve unit as a stop means has trained valve element, which is intended to opening paths the check valves to limit. This allows a simple limitation of both opening paths be achieved. Under an "opening path" should thereby In particular, a space to be understood that for a Way of a valve body when opening the appropriate return valve provided is. Preferably, the stop means is integrally formed for both check valves.

Further It is suggested that the slingshot be at least partially rod-shaped accomplished is. As a result, a particularly space-saving arrangement can be found become.

advantageously, the stop means is intended to be axially displaced. This allows the switching behavior of the two check valves with each other be coupled. In particular, it is proposed, the slings axially between valve bodies the check valves to arrange.

In A particularly advantageous embodiment of the invention is proposed that at least one of the check valves having a valve body, at least partially in one piece is formed with the stop means. This can be a number of components are easily reduced.

Further it is proposed that at least one of the check valves has a valve spring guide, which at least partially in one piece executed with the stop means is. As a result, a number of components can be further reduced.

Preferably The control valve unit further includes an inner valve housing an operating volume, which is intended to at least to receive a valve element at least partially. This can a particularly simple and easy to install arrangement of the valve element found become. Under an "inner valve housing" is intended in particular a valve housing for at least one of the check valves be understood, preferably arranged within the STEU erventilgehäuses is. In particular, the volume of resources to be provided be to pick up the sling and the valve spring.

In a further embodiment, it is proposed that the control valve unit has at least one inner valve housing opening and at least one valve body of at least one of the non-return valves, which are designed to be at least partially axially overlapping. As a result, an advantageous resource flow can be achieved, the fast switching times of the phase advance direction allows. In this context, "axially overlapping" is to be understood in particular as meaning that the control valve unit has at least one cross-sectional plane perpendicular to an axial main extension direction, which has at least the valve body and the inner valve housing opening. An "inner valve housing opening" is to be understood in particular as an opening which is provided for the equipment.

In addition, will proposed that at least one of the check valves has a drop-shaped valve body. As a result, the flow of resources can be further improved, whereby the switching times can be further optimized.

Further is a Nockenwellenphasenverstelleinrichtung with a control valve unit according to the invention proposed. This can be a particularly simple and compact Camshaft phase adjusting be realized.

Preferably The Nockenwellenphasenverstelleinheit a Vorschaltventil which is intended to switch an operating mode. Thereby a camshaft phase adjusting unit can be provided, the particular about an entire speed spectrum of an internal combustion engine a particular having advantageous switching behavior.

Further Advantages are shown in the following description of the drawing. In the drawings are two embodiments of the invention shown. The drawings, the description and the claims contain numerous features in combination. The skilled person will become the characteristics expediently also consider individually and to meaningful further combinations sum up.

there demonstrate:

1 schematizes a camshaft phase adjuster with a control valve unit and a pilot valve,

2 the control valve unit in a first cross-sectional plane,

3 a cross-sectional drawing of the control valve unit along the level III-III 2 and

4 an alternative embodiment of a control valve unit.

1 schematically shows a camshaft phase adjusting device for a camshaft, not shown, of an internal combustion engine. The camshaft phase adjusting device has a Verstellaktuator 28a on, which is intended to adjust a phase angle of the camshaft with respect to a crankshaft, not shown. Furthermore, the camshaft phase adjusting device has a control valve unit 27a on, which is intended to the Verstellaktuator 28a head for. The control valve unit 27a is a pilot valve 26a upstream, by means of the two operating modes of the control valve unit 27a can be switched. Furthermore, the camshaft phase adjusting unit has a resource pump 29a which is intended to provide an operating medium pressure for the camshaft phase adjusting unit. In addition, the camshaft phase adjusting device has a resource tank 30a on, which is provided for a non-pressurized storage of a resource.

The adjusting actuator 28a is designed as a grand piano. The adjusting actuator 28a has an outer element 31a which is connected to the crankshaft via a suitable connecting device, such as a timing chain drive or a toothed belt drive. Next, the Verstellaktuator 28a an interior element 32a on, which is connected to the camshaft. The interior element 32a and the camshaft are rotatably connected.

Between the interior element 32a and the exterior element 31a are adjustment chambers 33a . 34a arranged. By means of the adjustment chambers 33a . 34a can the interior element 32a relative to the outer element 31a to be twisted. The adjustment chambers 33a . 34a are intended to the interior element 32a with firmly held outer element 31a to adjust in a first and a second adjustment directions. The adjustment chambers 33a . 34a are over a circumference of the inner element 32a arranged distributed and assigned in the circumferential direction alternately the adjustment directions.

The interior element 32a and the outer element 31a show wings 35a . 36a on, by means of which a gap between the inner element 32a and the exterior element 31a in the adjustment chambers 33a . 34a is divided. The wings 35a . 36a are alternately with the outer element 31a and the innermost element 32a connected. To the adjustment actuator 28a to adjust in the first adjustment, the adjustment chambers 33a filled with a resource and from the Verstellkammern 34a a resource is discharged. To the adjustment actuator 28a be adjusted in the opposite direction to the first adjustment second adjustment, the adjustment chambers 34a filled and from the adjustment chambers 33a the equipment is discharged.

The adjusting actuator 28a indicates an active mode of operation and a passive mode of operation on. In the active operating mode, the Verstellaktuator 28a by means of the by the resource pump 29a adjusted operating medium pressure adjusted. In the passive mode, the Verstellaktuator 28a adjusted by the camshaft moments.

To the adjustment actuator 28a be adjusted in the active mode in the first adjustment, the adjustment chambers 33a with the resource pump 29a connected and thereby acted upon by the operating medium pressure. At the same time the adjustment chambers 34a with the unpressurized resource tank 30a connected, whereby the resources from these adjustment chambers 34a is dissipated. Analog are for the second adjustment the adjustment chambers 34a with the resource pump 29a and the adjustment chambers 33a with the resource tank 30a connected.

To the adjustment actuator 28a in the passive mode of operation, the adjustment chambers become 33a . 34a directly connected. The passive operating mode is selected in particular when the camshaft has an alternating torque, with which the Verstellaktuator 28a is charged. By exploiting the alternating torque can be achieved that the resources of the one adjustment chambers 33a . 34a in the other adjustment chambers 34a . 33a is pumped. As a result, the phase position is adjusted, with an admission to one of the adjustment chambers 33a . 34a can be dispensed with the resource pressure of the resource pump.

The adjustment direction in which the Verstellaktuator 28a is adjusted, by means of the control valve unit 27a defined (from left to right) 2 and 3 ). The control valve unit 27a is designed as a 5/3-way proportional valve. The control valve unit 27a indicates a resource feed 10a on, which is intended to with the resource pump 29a to be connected. Next, the control valve unit 27a a resource exit 37a on, which is intended to with the resource tank 30a to be connected. Furthermore, the control valve unit 27a three resource connections 12a . 13a . 14a on that with the adjustment chambers 33a . 34a are connected. The two resources connections 12a . 14a are via a resource channel 50a connected with each other. Both equipment connections 12a . 14a are with the adjustment chambers 33a connected. The resource connection 13a is with the adjustment chambers 34a connected. The resource connection 14a forms an overflow groove.

Next, the control valve unit 27a a first check valve 11a and a second check valve 15a on. The two check valves 11a . 15a are in a common inner valve housing 22a arranged. The inner valve housing 22a has three inner valve housing openings 24a . 38a . 39a on, by means of which the check valves 11a . 15a can be acted upon with the resources. The inner valve housing opening 38a is designed axially and at the same time forms the resource inlet 10a , that with the buoyant pump 29a connected is. The two other inner valve housing openings 24a . 38a are arranged radially and with the operating medium connections 12a . 13a . 14a and / or the resource exit 37a connectable. The radial inner valve housing opening 24a is approximately centrally radially in the inner valve housing 22a arranged. The inner valve housing opening 39a is at one end of the inner valve housing 22a arranged, that of the axial inner valve housing opening 38a opposite.

The first check valve 11a is intended for the active operating mode. The first check valve 11a is in the resource feed 10a arranged. The check valve 11a allows a resource flow from the axial inner valve housing opening 38a to the inner valve housing opening 24a which is approximately centrally radially in the inner valve housing 22a is arranged. It prevents fluid flow from the radial inner valve housing openings 24a to the axial inner valve housing opening 38a ,

The first check valve 11a is in the axial inner valve housing opening 38a and thus in the resource inflow 10a arranged. It has a valve body 20a on, by means of which the axial inner valve housing opening 38a can be closed. A valve seat 40a for the valve body 20a is integral with a first inner valve housing part 41a of the inner valve housing 22a executed. For the valve body 20a an opening path is provided extending in one of the inner valve housing opening 38a extends away. The valve body 20a has a teardrop shape. A rounded part of the valve body 20a is the inner valve housing opening 38a or the valve seat 40a facing. A pointed part of the valve body 20a is the resource volume 23a facing, or the valve seat 40a away.

The second check valve 15a is intended for the passive mode of operation. The non-return valve 15a allows a resource flow from the radial inner valve housing opening 39a at the end of the inner valve body 22a is arranged, to the inner valve housing opening 24a located in the middle of the inner valve body 22a is arranged. It prevents fluid flow from the axial inner valve housing opening 38a or the inner valve housing opening 24a to the inner valve housing opening 39a ,

The second check valve 15a is between the resource connections 12a . 13a . 14a arranged by means of a control slide 42a with the radial inner valve housing openings 24a . 39a are connectable. For the first adjustment of the Verstellaktuators 28a is the check valve 15a between the equipment connection 14a and the resource connection 13a arranged. For the second adjustment is the check valve 15a between the equipment connection 13a and the resource connection 12a arranged. The second check valve 15a is effective between the Verstellkammern 33a . 34a arranged.

The second check valve 15a has a valve body 25a resulting in an operating fluid flow between the two radial inner valve housing openings 24a . 39a of the inner valve housing 22a is arranged. It has a valve seat 43a on, which is integral with a second inner valve housing part 44a of the inner valve housing 22a is executed. For the valve body 25a an opening path is provided which extends in the direction of the valve body 20a the other check valve 11a extends. The middle inner valve housing opening 24a adjoins the valve seat 43a at. The inner valve housing opening 24a that is for the second check valve 15a is provided, and the valve body 25a of the second check valve 15a partially overlap in the axial direction.

Through the second check valve 15a becomes a resource volume 23a inside the inner valve body 22a into a first resource subvolume 45a and a second resource subvolume 46a divided up. The first resource part volume 45a that between the two check valves 11a . 15a is arranged, can essentially be assigned to the active operating mode, since a volume flow for filling the adjustment chambers 33a . 34a exclusively by the first resource partial volume 45a flows. The second resource subvolume 46a that on the first check valve 11a opposite side of the second check valve 15a is substantially attributable to the passive mode of operation, since it is intended exclusively for the passive mode of operation.

As a common, moving valve element 16a show the two check valves 11a . 15a a common valve spring 18a on. The valve spring 18a is axial between the valve bodies 20a . 25a the two check valves 11a . 15a arranged. It is supported at its ends on the two valve bodies 20a . 25a from. The opening paths of the two valve bodies 20a . 25a are in the direction of the valve spring 18a directed. This will give a force to the valve spring 18a on the valve body 20a . 25a exerts increases when one of the check valves 11a . 15a is open.

As another common valve element 17a have the two check valves a common stop means 19a on, by means of which the opening paths of the check valves 11a . 15a are limited. The slings 19a is axially displaceable between the two valve bodies 20a . 25a angeord net. The slings 19a is designed rod-shaped. The slings 19a represents the opening paths of the check valves 11a . 15a depending on an operating parameter. A valve spring guide 21a for the valve spring 18a the two check valves 11a . 15a is integral with the slings 19a trained and thus also axially displaceable.

The slings 19a and the valve spring 18a are common in the first resource subvolume 45a between the two check valves 11a . 15a arranged. The valve spring 18a is designed as a coil spring. The rod-shaped stop means 19a is radially inside the valve spring 18a arranged.

The valve body 20a of the first check valve 11a is integral with the slings 19a educated. The tapered part of the valve body 20a goes into the rod-shaped stop means 19a above. The valve spring 18a rests on flanks of the pointed part of the valve body 20a from.

The control valve unit 27a has a neutral position and two switch positions. In the neutral position, the phase angle between the crankshaft and the camshaft is maintained. In the first switching position, the phase position is adjusted in the first switching direction. In the second switching position, the phase position is adjusted in the second switching direction.

For switching the neutral position or the switching positions, the control valve unit, the spool 42a on, by means of an actuator along an axial direction of the control valve unit 27a can be moved. The spool 42a is between the inner valve housing 22a the two check valves 11a . 15a and a control valve housing 47a the control valve unit 27a arranged. In the spool 42a are two tax cutouts 48a . 49a brought in. For switching the active operating mode or the passive operating mode, the camshaft phase adjusting the Vorschaltventil 26a on. The pilot valve 26a is by means of the by the resource pump 29a switched operating medium pressure switched. Of course, it is also conceivable to supply the pressure necessary for the switching of the valve via a separate line in order to be able to provide the switching pressure independently of the operating medium pressure. At a high operating pressure, the active operating mode is activated. at Low operating pressure activates the passive operating mode. The pilot valve 26a is between the resource exit 37a the control valve unit 27a and the resource tank 30a arranged. In the passive mode of operation are the resource exit 37a and the resource tank 30a separated from each other. In the active operating mode are the resource outlets 37a and the resource tank 30a connected with each other.

In the first switching position connects the control recess 48a the equipment connection 12a with the inner valve housing opening 24a and thus with the first resource part volume 45a that between the two check valves 11a . 15a is arranged. The control recess 49a connects the equipment connection 13a with the resource exit 37a , In addition, the control recess connects 49a the equipment connection 13a or the resource exit 37a with the inner valve housing opening 39a and thus with the second resource subvolume 46a , The resource connection 14a is deported in the first switching position.

In the active mode of operation, the resource flows in the first switching position from the resource inlet 10a through the first resource subvolume 45a , continue through the inner valve housing opening 24a , the control recess 48a to the resource connection 12a , This will make the adjustment chambers 33a filled with the equipment. At the same time, the operating medium flows from the operating medium connection 13a over the control recess 49a to the resource exit 37a , whereby the resources from the adjustment chambers 34a is dissipated. The two resource part volumes 45a . 46a are separated in the active mode of operation because the opened first check valve 11a by means of the common, axially displaceable stop means 19a and the resource pressure in the resource subvolume 45a the second check valve 15a closes.

In the passive mode of operation, the resource flows in the first switching position from the resource port 13a over the control recess 49a and the inner valve housing opening 39a in the second resource subvolume 46a , From there, the operating fluid flows through the second check valve 15a in the first resource subvolume 45a and from there via the inner valve housing opening 24a and the control recess 48a to the equipment connection 12a , An outflow of the equipment via the resource outlet 37a is through the pilot valve 26a avoided. The first check valve 11a is in this mode of operation by the common, axially displaceable stop means 19a closed.

In the second switching position connects the control recess 48a the equipment connection 13a with the inner valve housing opening 24a and thus with the first resource part volume 45a that between the two check valves 11a . 15a is arranged. The control recess 49a connects the equipment connection 14a with the resource exit 37a , In addition, the control recess connects 49a the equipment connection 14a or the resource exit 37a with the inner valve housing opening 39a and thus with the second resource subvolume 46a , The resource connection 12a is deported in the second switching position.

In the active operating mode, the operating medium in the second switching position flows from the operating medium feed 10a through the first check valve 11a in the first resource subvolume 45a and further through the inner valve housing opening 24a and the control recess 48a to the equipment connection 13a , This will make the adjustment chambers 34a filled with the equipment. At the same time, the operating medium flows from the operating medium connection 14a to the resource exit 37a , whereby the resources from the adjustment chambers 33a is dissipated. The two resource part volumes 45a . 46a are separated in the active mode of operation because the opened first check valve 11a by means of the lifting gear 19a the second check valve 15a closes.

In the passive operating mode, the operating medium in the second switching position flows from the operating medium connection 14a over the control recess 49a and the inner valve housing opening 39a in the second resource subvolume 46a , From there, the operating fluid flows through the second check valve 15a in the first resource subvolume 45a and from there via the inner valve housing opening 24a and the control recess 48a to the equipment connection 13a , An outflow of the equipment via the resource outlet 37a is through the pilot valve 26a avoided. The first check valve 11a is in this mode of operation by the slings 19a closed.

In the passive operating mode can in both switch positions via the first check valve 11a Resources are tracked when an adjustment completed and the second check valve 15a closed is. As a result, for example, a leakage discharge of resources can be compensated.

In the 4 a further embodiment of the invention is shown. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the 1 to 3 by the letter b in the reference numerals of the embodiment in the 4 replaced. The following description is essentially limited to the differences from the embodiment in the 1 to 3 , wherein with respect to the same components, features and functions on the description of the embodiment in the 1 to 3 can be referenced.

4 shows an alternative embodiment of a control valve unit 27b for a camshaft phaser. In contrast to the first embodiment, the control valve unit 27b a first check valve 11b on, the one formed as a ball valve body 20b having. Furthermore, a stop means 19b that is axially between the valve body 20b and a valve body 25b a second check valve 15b is arranged, separated from the two valve bodies 20b . 25b executed. The slings 19b is rod-shaped and acts as a common stop means 19b for the two check valves 11b . 15b intended. It is in one piece as a valve spring guide 21b for a common valve spring 18b the two check valves 11b . 15b educated.

Claims (12)

Control valve unit, in particular a phase adjustment device of a camshaft, with at least one in a resource supply ( 10a ; 10b ) arranged first check valve ( 11a ; 11b ) and at least one between at least two resource connections ( 12a . 13a . 14a ; 12b . 13b . 14b ) arranged second check valve ( 15a ; 15b ), characterized in that the two check valves ( 11a . 15a ; 11b . 15b ) at least one common, moving valve element ( 16a . 17a ; 16b . 17b ) exhibit. Control valve unit according to claim 1, characterized by a valve spring ( 18a ; 18b ) formed valve element ( 16a ; 16b ). Control valve unit according to claim 1 or 2, characterized by a stop means ( 19a ; 19b ) formed valve element ( 17a ; 17b ), which is intended to opening paths of the check valves ( 11a . 15a ; 11b . 15b ) to limit. Control valve unit according to claim 3, characterized in that the stop means ( 19a ; 19b ) is executed at least partially rod-shaped. Control valve unit at least according to claim 3, characterized in that the stop means ( 19a ; 19b ) intended to be axially displaced. Control valve unit at least according to claim 3, characterized in that at least one of the check valves ( 11a ) a valve body ( 20a ), which at least partially integral with the stop means ( 19a ) is trained. Control valve unit at least according to claim 3, characterized in that at least one of the check valves ( 11a . 15a ; 11b . 15b ) a valve spring guide ( 21a ; 21b )) which at least partially integral with the stop means ( 19a ; 19b ) is executed. Control valve unit according to one of the preceding claims, characterized by an inner valve housing ( 22a ; 22b ) with a resource volume ( 23a ; 23b ), which is provided to the at least one valve element ( 16a . 17a ; 16b . 17b ) at least partially. Control valve unit according to one of the preceding claims, characterized by at least one inner valve housing opening ( 24a ; 24b ) and at least one valve body ( 25a ; 25b ) of at least one of the check valves ( 15a ; 15b ), which are designed at least partially axially overlapping. Control valve unit according to one of the preceding claims, characterized in that at least one of the check valves ( 11a ) a drop-shaped valve body ( 20a ) having. Camshaft phase adjusting device, in particular for a camshaft of an internal combustion engine, with a control valve unit ( 27a ; 27b ) according to any one of the preceding claims. Camshaft phase adjusting device according to claim 11, characterized by a pilot valve ( 26a ; 26b ), which is intended to switch an operating mode.