JP2000027878A - Shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft coupling having a new structure capable of excellently coping with eccentricity between the driving shaft side and the driven shaft side, a deflection angle and a thrust movement, capable of reducing the size, having excellent strength, easy in maintenance and simple in a structure and assembling. SOLUTION: A driving side member 2 has the driving side slide inside surface 3 in a plane parallel to the Y-Z surface formed of the side surfaces of shaft directional projections 3a, 3b ; 3c, 3d in a position separate from the rotational center 2'. A driven side member 4 has the driven side slide inside surface 5 in a plane parallel to the X-Z surface formed of the side surfaces of shaft directional projections 5a, 5b ; 5c, 5d in a position separate from the rotation center 4'. A torque transmitting member 6 interposed between the driving side member 2 and the driven side member 4 has the central part 7 and the extending parts 8a, 8b ; 9a, 9b extending outside in the radial direction, and the driving side and driven side slide inside surfaces 3, 5 and the respectively slidable side outside surfaces 8, 9 are formed on the side surfaces of these extending parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for transmitting a driving torque, and more particularly, to a structure capable of favorably dealing with eccentricity, declination and thrust movement between a driving shaft side and a driven shaft side. And a shaft coupling that is easy to assemble.

[0002]

2. Description of the Related Art Two rotary shafts (a driving shaft and a driven shaft) in various types of torque transmitting mechanisms.
Are connected by a joint. For example, the output rotation shaft of the motor and the input rotation shaft of the pump are connected by a joint. In this case, careful installation of the motor and the pump so that the output rotation axis of the motor and the input rotation axis of the pump are sufficiently aligned requires considerable effort. In addition, even if the installation is performed with due care for such alignment, some eccentricity and declination remain between the two rotating shafts, and furthermore, the motor and the pump generate vibration during operation, Conventionally, a flexible joint using a flexible member such as a spring or a wire has been used to absorb these at the joint portion. An Oldham coupling is used as a coupling capable of coping with eccentricity and declination.

The present invention can satisfactorily deal with eccentricity, declination and thrust movement between the driving shaft side and the driven shaft side, can be miniaturized, has good strength, and is simple in structure and assembly. It is an object of the present invention to provide a shaft coupling having a new structure.

Another object of the present invention is to provide a shaft coupling having the above-mentioned novel structure and easy maintenance.

[0005]

According to the present invention, in order to achieve the above object, a rotational force transmitting member is interposed between a driving side member and a driven side member, and the driving side member is provided with a rotating force transmitting member. It has two pairs of driving side projections projecting toward the rotational force transmitting member at a position separated from the rotation center, and the rotation center of the driving side member is defined by the side surface of each pair of driving side projections. And a driven side slide inner surface parallel to a surface in the first direction passing through the driven member, wherein the driven side member protrudes toward the rotational force transmitting member at a position separated from the rotation center thereof. The driven side slide inner surface parallel to the second direction surface passing through the rotation center of the driven side member is formed by the side surface of each pair of driven side projections, and the rotational force transmission is performed. The member is at the center and radially outward from the center Two first extending portions extending in opposite directions, and two second extending portions extending in opposite directions from the central portion outward in a radial direction different from the first extending portions. A first slide outer surface slidable on the driving side slide inner surface on a side surface of the first extension portion, and a driven side slide inner surface on a side surface of the second extension portion. And a second slide outer surface slidable with the shaft coupling is formed.

In one aspect of the present invention, the first extending portion and the second extending portion of the torque transmitting member are located at the same axial position.

In one embodiment of the present invention, the rotational force transmitting member includes a flat plate-like portion and ribs formed on both surfaces thereof so as to protrude toward the driving side member and the driven side member. .

In one aspect of the present invention, the driving side member has an axial through hole for receiving a driving shaft, and the driven side member has an axial through hole for receiving a driven shaft. ing.

In one embodiment of the present invention, the driving member and the driven member are made of metal, and the torque transmitting member is made of plastic.

In one embodiment of the present invention, the first direction is orthogonal to the second direction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft coupling according to the present invention, FIG. 2 is a perspective view of an assembled state thereof, and FIG. 3 is a sectional view thereof.

In these figures, reference numeral 2 denotes a driving side member, and reference numeral 2 'denotes a rotation center thereof. Reference numeral 4 denotes a driven side member, and reference numeral 4 'denotes a rotation center thereof. The driving-side member 2 and the driven-side member 4 are arranged so as to face each other, and to coincide with the rotation centers 2 ′ and 4 ′ in the Z direction. Each of the driving side member 2 and the driven side member 4 has a substantially cylindrical shape along the rotation centers 2 ′, 4 ′, and has an outer diameter R. A rotational force transmitting member 6 is interposed between the driving side member 2 and the driven side member 4.

The driving side member 2 has a through hole in the Z direction along the center of rotation 2 ', and the inner surface of the through hole is adapted to the outer peripheral surface of the end of the driving shaft (not shown). That is, the driving shaft rotates about the rotation center 2 '. As shown in the drawing, a slit 10 in a plane parallel to the XZ plane is formed in the driving side member 2 so as to reach the through hole from the outside. Bolt 11 in the direction
The driving side member 2 is attached to the end of the driving shaft. A pair of driving-side slide inner surfaces 3 parallel to the YZ plane are formed on an end surface of the driving-side member 2 facing the rotational force transmitting member 6, and the distance therebetween is L. The slide inner surface 3 is not formed in a range up to the diameter r, that is, the slide inner surface 3 has four axial protrusions 3a, 3b, 3c, which have a diameter between r and R with respect to the rotation center 2 '. It is formed on the 3d side surface. Opposing side surfaces of the axial protrusions 3a and 3b form a pair and form a slide inner surface.
Sides of c and 3d facing each other form a pair to form an inner slide surface. In this specification, "axial direction"
Refers to a direction along the rotation centers 2 ′, 4 ′, and “radial direction” refers to a direction along a radius with respect to the rotation centers 2 ′, 4 ′.

Similarly, the driven side member 4 has a through hole in the Z direction along the rotation center 4 ', and the inner surface of the through hole is adapted to the outer peripheral surface of the end of the driven shaft (not shown). That is,
The driven shaft rotates around the rotation center 4 '. As shown in the figure, the driven side member 4 is formed with a slit 12 in a plane parallel to the YZ plane so as to reach the through hole from the outside. The driven member 4 is attached to the end of the driven shaft by tightening the bolt 13 in the direction. A pair of driven side slide inner surfaces 5 parallel to the XZ plane are formed on an end surface of the driven side member 4 facing the rotational force transmitting member 6, and the interval between them is L. The slide inner surface 5 is not formed in a range up to the diameter r, that is, the slide inner surface 5 has four axial projections 5a, 5b, 5c, which have a diameter between r and R with respect to the rotation center 4 '. 5d. Opposing side surfaces of the axial projections 5a and 5b form a pair to form a slide inner surface, and the axial projections 5a and 5b
Sides of c and 5d facing each other form a pair to form a slide inner surface.

The rotational force transmitting member 6 has a central portion 7 having a diameter r 'smaller than the above-mentioned r and having a substantially cylindrical outer shape, and a radially outward direction from the central portion 7 in a direction opposite to the Y direction. Two projecting first extending portions 8a and 8b, and two projecting second extending portions 9a and 9b projecting from the central portion 7 outward in the radial direction in the X direction, respectively. Become.
Each of the extending portions 8a and 8b is formed with a pair of first slide outer surfaces 8 that are parallel to the YZ plane, and the distance between them is L. Each of the extending portions 9a and 9b is formed with a pair of second sliding outer surfaces 9 parallel to the XZ plane.
Their spacing is L. The first extending portions 8a and 8b and the second
The extension portions 9a and 9b are located at the same axial position.

As can be seen from FIGS. 2 and 3, the rotational force transmitting member 6 has a slide outer surface 8 formed on the extending portion 8a between the driving side member 2 and the driven side member 4, and has a sliding outer surface 8 formed between the driving side member 2 and the driven side member 4. Slidably abut against the slide inner surface 3 formed on the protrusions 3a, 3b of the driving member 2, and the slide outer surface 8 formed on the extension portion 8b is formed on the protrusions 3c, 3d of the driving side member 2. Slidably in contact with the extension 9a
The slide outer surface 9 formed on the
a and 5b are slidably in contact with the slide inner surface 5 formed on the extension member 9b, and the slide outer surface 9 formed on the extension portion 9b slides on the slide inner surface 5 formed on the protrusions 5c and 5d of the driven side member 4. It is movably abutted and arranged. That is, the projections 3a to 3d of the rotational force transmitting member 6 and the driving side member 2
And the projections 5a to 5d of the driven-side member 4 are located within substantially the same axial range, so that when the rotational force is transmitted, the compressive force, not the torsional force, is applied to the rotational force transmitting member 6 mainly. Therefore, even if the torque transmitting member 6 is made of plastic, a considerable amount of torque can be transmitted without damaging the torque transmitting member 6, and
The axial dimension of the joint can be minimized (i.e., downsized) without a reduction in transmitted torque.

FIG. 4 is a sectional view of the torque transmitting member 6.
As shown in FIG. 4, the rotational force transmitting member 6 is X-
It comprises a flat plate portion 16 parallel to the Y-plane and ribs 18 and 20 protrudingly formed on the driving member side and the driven member side of the flat plate portion. That is, the cylindrical outer shape of the central portion 7 of the rotational force transmitting member 6 mainly includes the ribs 18 and 2.
0, the extending portion 8 of the rotational force transmitting member 6
a, 8b, 9a, 9b, especially the slide outer surfaces 8, 9
Is also formed mainly by the ribs 18 and 20. That is, the flat plate portion 16 includes the central portion 7 and the extending portions 8a, 8b,
It has a function of reinforcing 9a and 9b. With such a configuration, it is possible to reduce the weight of the rotational force transmitting member 6 while maintaining the required strength.

The driving side member 2 and the driven side member 4 are made of a metal material such as an aluminum alloy. The torque transmitting member 6 is made of a plastic material. As the plastic material, a synthetic resin, such as a polyacetal resin or a polyamide resin, having an appropriate sliding property with respect to the metal material of the driving side member 2 and the driven side member 4 and having an appropriate strength can be used. The plastic rotational force transmitting member 6 has a self-lubricating property and continuously performs a lubricating action when it comes into contact with the slide inner surface 3 of the driving member 2 and the slide inner surface 5 of the driven member 4.

Thus, in the present embodiment, the rotational force transmitting member 6 is configured such that the first slide outer surface 8 slides in the Y direction, the Z direction slide movement and the X direction with respect to the slide inner surface 3 of the driving side member 2. The second sliding outer surface 9 can be moved relative to the driving side member 2 by performing
Performs relative movement with respect to the driven side member 4 by performing sliding movement in the X direction, sliding movement in the Z direction, and rotation about the Y direction with respect to the inner slide surface 5 of the driven side member 4.

Accordingly, in this embodiment, when the driving shaft rotates, the rotational force is transmitted from the driving member 2 to the driven member 4 via the rotational force transmitting member 6, and the driven shaft is rotated. When eccentricity, declination, or thrust movement occurs between the driving shaft and the driven shaft, the relative movement between the rotational force transmitting member 6 and the driving side member 2 and the rotational force transmitting member 6 and the driven side The relative movement between the member 4 and the member 4 can cope well. The distance between the driving side member 2 and the driven side member 4 may be appropriately determined according to the expected eccentricity, declination, or magnitude of the thrust movement.

In the present embodiment, even if the rotational force transmitting member 6 is broken, the protrusions 3a to 3a
3d and the projections 5a to 5d of the driven side member 4 are located within substantially the same axial range, so that they come into contact with each other and the transmission of rotational force from the driving side member 2 to the driven side member 4 is maintained. Is done.

The above-described shaft coupling of this embodiment can be easily manufactured by assembling the constituent members as shown in FIG. In particular, at the time of this assembling, since the driving side member 2 and the driven side member 4 are fixed to the driving shaft end and the driven shaft end by tightening, respectively, the phase (rotation angle) of the driving shaft end and the driven shaft end. It is not necessary to perform an operation to match the phase with the phase. In addition, the driving shaft end and the driven shaft end do not require any special processing, and may be cylindrical. Fig. 4
As shown in FIG. 3, concave portions (flat portions 16) formed at both sides in the axial direction at the center of the rotational force transmitting member 6 are formed.
And the ends of the driven shaft F and the driven shaft F, respectively.
The arrangement distance in the axial direction between the driving-side device and the driven-side device can be reduced.

At the time of disassembly, by moving one of the driving shaft end and the driven shaft end away from the other in the axial direction, the rotational force transmitting member 6 and the driving side member 2 and the driving-side member 2 after the release of the tightening are removed. The driven member 4 can be removed.

In the present embodiment, the driving member 2 is attached to the outer peripheral surface of the end of the driving shaft, and the driven member 4 is attached to the outer peripheral surface of the end of the driven shaft. In this way, the distance between the end of the driving shaft and the end of the driven shaft can be minimized, and the length in the axial direction can be reduced, so that downsizing can be achieved.

Further, in the present embodiment, the rotational force transmitting member 6
Exerts self-lubricating properties in sliding contact with the driving side member 2 and the driven side member 4, so that there is no need to use a lubricating oil and maintenance is easy.

FIG. 5 is an exploded perspective view showing a second embodiment of the shaft coupling according to the present invention. In FIG. 5, FIG.
Members having the same functions as those in FIG. 4 are denoted by the same reference numerals. This embodiment differs from the first embodiment only in the means for attaching the driving side member 2 to the driving shaft and the means for attaching the driven side member 4 to the driven shaft.
That is, in the present embodiment, the driving side member 2 and the driven side member 4
No slits are provided, for example, a radial bolt hole (not shown) is formed in each of the driving side member 2 and the driven side member 4, and a bolt is screwed to reach the driving shaft end or the driven shaft end. By doing so, attachment to the driving shaft and attachment to the driven shaft can be performed. In this case, it is preferable to form an engaging hole for engaging the tip of the bolt at a predetermined position on the outer peripheral surface of the end of the driving shaft and the outer peripheral surface of the end of the driven shaft. Alternatively, the driving side member 2 and the driven side member 4 can be attached to the driving shaft end and the driven shaft end using a key or a spline.

According to this embodiment, the same functions and effects as those of the first embodiment can be obtained except that the driving side member 2 and the driven side member 4 are attached to the driving shaft and the driven shaft.

[0029]

As described above, according to the present invention, eccentricity, declination, and thrust movement between the driving shaft side and the driven shaft side can be well dealt with, miniaturization is possible, and good strength is achieved. Have
A shaft coupling having a novel structure that is simple in structure and assembly is provided. Further, according to the present invention, a shaft coupling having such a novel structure and easy to maintain is provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft coupling according to the present invention.

FIG. 2 is a perspective view of the assembled state of the first embodiment of the shaft coupling according to the present invention;

FIG. 3 is a sectional view of a first embodiment of a shaft coupling according to the present invention;

FIG. 4 is a sectional view of a torque transmitting member of the first embodiment of the shaft coupling according to the present invention.

FIG. 5 is an exploded perspective view showing a second embodiment of the shaft coupling according to the present invention.

[Explanation of symbols]

 2 Driving side member 2 'Driving side member rotation center 3 Driving side slide inner surface 3a, 3b, 3c, 3d Axial protrusion 4 Driving side member 4' Driving side member rotation center 5 Driving side slide inner surface 5a, 5b, 5c, 5d Shaft Direction protrusion 7 Central portion 8 First slide outer surface 8a, 8b First extension portion 9 Second slide outer surface 9a, 9b Second extension portion 10 Slit 11 Bolt 12 Slit 13 Bolt 16 Flat plate portion 18, 20 Rib 18, 20 D Drive shaft F Drive shaft

Claims (6)

[Claims] 1. A rotational force transmitting member is interposed between a driving side member and a driven side member, and the driving side member is directed toward the rotational force transmitting member at a position separated from a rotation center thereof. It has two pairs of protruding driving side projections, and a driving side slide inner surface parallel to a first direction surface passing through the rotation center of the driving side member is formed by the side surface of each pair of driving side projections. The driven-side member has two pairs of driven-side protrusions projecting toward the rotational force transmitting member at a position separated from the center of rotation, and a side surface of each pair of driven-side protrusions. And a driven-side slide inner surface parallel to a surface in the second direction passing through the rotation center of the driven-side member, wherein the rotational force transmitting member is opposite to a central portion and radially outward from the central portion. Two first extending portions extending in the directions and the central portion from the first extending portion. The first extending portion has two second extending portions that extend outward in opposite directions in a radial direction different from the first extending portion. A slidable first slide outer surface is formed, and a second slide outer surface slidable with the driven slide inner surface is formed on a side surface of the second extending portion. Shaft coupling. 2. A first extension part and a second extension part of the torque transmitting member.
The shaft coupling according to claim 1, wherein the extending portion is present at the same axial position. 3. The rotating force transmitting member is constituted by a flat plate portion and ribs formed on both surfaces thereof so as to protrude toward the driving side member and the driven side member. The shaft coupling according to claim 1. 4. The driving-side member has an axial through-hole for receiving a driving shaft, and the driven-side member has an axial through-hole for receiving a driven shaft. The shaft coupling according to any one of claims 1 to 3. 5. The shaft coupling according to claim 1, wherein the driving side member and the driven side member are made of metal, and the rotational force transmitting member is made of plastic. 6. The shaft coupling according to claim 1, wherein the first direction and the second direction are orthogonal to each other.