JP2004293637A - Shaft coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft coupling, of simplified structure, that can be easily manufactured, and that is capable of realizing large tolerance both for eccentricity and an angular bias. <P>SOLUTION: Slide grooves 22 and 42 in rotary members 2 and 4 on the drive side and the driven side are respectively provided with a pair of mutually facing slide inner surfaces 22a and 42a. A torque transmission member 6 has slide parts 62 and 64 to be respectively matched to the slide grooves 22 and 42 on the drive side and the driven side. They are respectively provided with a pair of slide outer surfaces 62a and 64a that are parallel to each other to be slidably applied to the slide inner surfaces 22a and 42a. They are perpendicular to each other. In the rotary members 2 and 4 on the drive side and the driven side, receiving grooves 24 and 44 are formed to respectively receive the slide parts 64 and 62 with clearance. The slide grooves 22 and 42 have same groove width, and the receiving grooves 24 and 44 have same groove width. The torque transmission member are formed spherical in both end surfaces 66 and 68. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of rotational force transmission, and particularly to an Oldham shaft coupling.
[0002]
Problems to be solved by the prior art and the invention
In the torque transmission system, a shaft coupling is used to connect the driving-side rotating shaft and the driven-side rotating shaft.Especially, even if the rotation centers of the driving-side and the driven-side do not coincide with each other, the rotating force is smoothly reduced. In order to transmit the force to the shaft, an Oldham shaft coupling having a relatively simple mechanism is used.
[0003]
However, the conventional Oldham coupling has considerable tolerance for the eccentricity in which the distance between the rotation centers is shifted while the driving-side rotation center and the driven-side rotation center are kept parallel to each other, but the driving-side rotation center and the driven-side rotation center Regarding the declination that forms an angle with the center of rotation, many of them did not take into account much tolerance. In addition, there is a demand for mass production of such a shaft coupling at low cost.
[0004]
Accordingly, an object of the present invention is to provide a shaft coupling that has a simplified structure, is easy to manufacture, and can realize a large tolerance in both eccentricity and eccentricity.
[0005]
[Means for Solving the Problems]
According to the present invention, as achieving the above objects,
A driving-side rotating member rotating around a driving-side rotation center and a driven-side rotating member rotating around a driven-side rotation center are arranged so as to face each other, and from the driving-side rotating member to the driven-side rotating member. And a shaft coupling in which a rotational force transmitting member is arranged between these so as to transmit the rotational force.
A driving side slide groove is formed in the driving side rotating member so as to face the rotational force transmitting member, and the driving side slide groove is a pair of opposing driving side slides parallel to a plane including the driving side rotation center. With an inner surface,
The driven-side rotating member has a driven-side slide groove facing the rotational force transmitting member, and the driven-side slide groove is a pair of opposed driven-side slides parallel to a plane including the driven-side rotation center. With an inner surface,
The rotational force transmitting member has a first slide portion adapted to the driving side slide groove and a second slide portion adapted to the driven side slide groove, wherein the first slide portion is the driving side slide groove. A pair of parallel first slide outer surfaces slidably in contact with the inner surface, and the second slide portion includes a pair of parallel second slide outer surfaces slidably in contact with the driven slide inner surface. The second slide outer surface is orthogonal to the first slide outer surface, and the rotational force transmitting member has a first slide portion in a cross section orthogonal to both the first slide outer surface and the second slide outer surface. And the second slide portion are shaped so as to form portions that are orthogonal to each other in a cross-shaped cross section,
The driving-side rotating member has a driving-side receiving groove for receiving the second slide portion of the rotational-force transmitting member with a margin, and the driven-side rotating member has the first slide of the rotational-force transmitting member. The driven side receiving groove is formed so that the part can be received with margin.
A shaft coupling, wherein the driving side slide groove and the driven side slide groove have substantially the same groove width,
Is provided.
[0006]
In one aspect of the present invention, the driving-side receiving groove and the driven-side receiving groove have substantially the same groove width. In one aspect of the present invention, the rotational force transmitting member is formed in a convex curved shape in which an end face facing the driving side rotating member and an end face facing the driven side rotating member have substantially the same shape. In one aspect of the present invention, both the driving side rotating member and the driven side rotating member are made of metal, and the rotating force transmitting member is made of synthetic resin.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
FIG. 1 is an exploded perspective view showing an embodiment of a shaft coupling according to the present invention, and FIG. 2 is a perspective view showing an assembled state thereof. FIG. 3 shows an exploded plan view of the present embodiment and a view of the driving-side rotating member, the driven-side rotating member, and the rotational force transmitting member viewed from the axial direction. FIG. 4 is a plan view showing an assembled state of the present embodiment.
[0009]
In these figures, the substantially cylindrical driving-side rotating member 2 can rotate around the driving-side rotation center 2 ′, and the substantially cylindrical driven-side rotating member 4 rotates around the driven-side rotation center 4 ′. The driving-side rotating member 2 and the driven-side rotating member 4 are arranged to face each other with the driving-side rotation center 2 ′ and the driven-side rotation center 4 ′ being coaxial in the Z direction. Between the driving side rotating member 2 and the driven side rotating member 4, a rotational force transmitting member 6 for transmitting a rotating force from the driving side rotating member 2 to the driven side rotating member 4 is arranged. The rotational force transmitting member 6 is arranged so that its center axis 6 'is coaxial with the driving side rotation center 2' and the driven side rotation center 4 'in the Z direction.
[0010]
The driving side rotating member 2 is formed with a driving side slide groove 22 extending in the Y direction and a driving side receiving groove 24 extending in the X direction, facing the rotational force transmitting member 6. All of these grooves extend through the driving side rotation center 2 '. The driving-side slide groove 22 includes a pair of opposing driving-side slide inner surfaces 22a that are parallel to a plane including the driving-side rotation center 2 ′ (a plane parallel to the YZ plane). The driving-side rotation center 2 ′ passes exactly between the inner surfaces of the pair of driving-side slides. The driving-side receiving groove 24 includes a pair of opposing driving-side receiving groove inner surfaces 24a that are parallel to a plane including the driving-side rotation center 2 ′ (a plane parallel to the XZ plane). The driving-side rotation center 2 ′ passes exactly between the pair of driving-side receiving groove inner surfaces 24 a. A through-hole 26 extending in the direction of the driving-side rotation center 2 ′ is formed in the center of the driving-side rotating member 2, and a driving-side rotation shaft (not shown) is inserted through the through-hole 26. The driving-side rotating member 2 is formed with a screw hole 28 extending from the outer peripheral surface to the through hole 26, and a screw (not shown) is fitted in the screw hole, thereby fixing the driving-side rotating shaft and driving the driving side. The driving side rotating member 2 is attached to the side rotating shaft.
[0011]
Similarly, the driven-side rotating member 4 is formed with a driven-side slide groove 42 extending in the X direction and a driven-side receiving groove 44 extending in the Y direction, facing the rotational force transmitting member 6. Each of these grooves extends through the driven-side rotation center 4 '. The driven-side slide groove 42 includes a pair of opposed driven-side slide inner surfaces 42a that are parallel to a plane including the driven-side rotation center 4 ′ (a plane parallel to the XZ plane). The driven-side rotation center 4 ′ passes through exactly the middle between the pair of driven-side slide inner surfaces. The driven-side receiving groove 44 includes a pair of opposing driven-side receiving groove inner surfaces 44a that are parallel to a plane including the driven-side rotation center 4 ′ (a plane parallel to the YZ plane). The driven-side rotation center 4 ′ passes exactly between the pair of driven-side receiving groove inner surfaces 44 a. A through-hole 46 extending in the direction of the driven-side rotation center 4 ′ is formed at the center of the driven-side rotating member 4, and a driven-side rotating shaft (not shown) is inserted into the through-hole. The driven side rotating member 4 is formed with a screw hole 48 which extends from the outer peripheral surface to the through hole 46, and a screw (not shown) is fitted in the screw hole, thereby fixing the driven side rotating shaft to the driven side. The driven side rotation member 4 is attached to the side rotation shaft.
[0012]
The rotational force transmitting member 6 has a first slide portion 62 adapted to the driving side slide groove 22 and a second slide portion 64 adapted to the driven side slide groove 42. The first slide portion 62 includes a pair of first slide outer surfaces 62a parallel and opposite to each other and slidably abutting on the drive side slide inner surface 22a of the drive side rotating member 2. The second slide portion 64 includes a pair of second slide outer surfaces 64a that are parallel and opposite to each other and slidably contact the driven-side slide inner surface 42a of the driven-side rotating member 4. The second slide outer surface 64a parallel to the XZ plane is orthogonal to the first slide outer surface 62a parallel to the YZ plane. In the rotational force transmitting member 6, the first slide portion 62 and the second slide portion 64 are orthogonal to each other in a cross-sectional shape in a cross section (XY cross section) orthogonal to both the first slide outer surface 62a and the second slide outer surface 64a. The first slide portion 62 and the second slide portion 64 are formed so as to intersect and be integrated on the central axis 6 '.
[0013]
The driving-side receiving groove 24 of the driving-side rotating member 2 receives the second slide portion 64 of the torque transmitting member 6 with a margin. That is, the groove width of the driving-side receiving groove 24 is larger than the thickness of the second slide portion 64. Accordingly, the rotational force transmitting member 6 is configured such that the first slide outer surface 62a slides in the YZ plane direction with respect to the driving-side slide inner surface 22a, thereby causing the driving-side rotating member 2 to move in the Y direction at a required stroke. Reciprocation, rotation at a required angular stroke around a rotation center parallel to the X direction, and reciprocation at an appropriate stroke in a direction parallel to the driving side rotation center 2 'are possible.
[0014]
Similarly, the driven-side receiving groove 44 of the driven-side rotating member 4 receives the first slide portion 62 of the rotational force transmitting member 6 with a margin. That is, the groove width of the driven receiving groove 44 is larger than the thickness of the first slide portion 62. Therefore, the rotational force transmitting member 6 is configured such that the second slide outer surface 64a slides in the XZ plane direction with respect to the driven-side slide inner surface 42a, thereby causing the driven-side rotary member 4 to move in the X direction at a required stroke. Reciprocal movement, rotation at a required angular stroke around a rotation center parallel to the Y direction, and reciprocation at an appropriate stroke in a direction parallel to the driven-side rotation center 4 'are possible.
[0015]
The driving-side slide groove 22 and the driven-side slide groove 42 have substantially the same groove width and other dimensions, and the driving-side receiving groove 24 and the driven-side receiving groove 44 have substantially the same groove width and other dimensions. That is, the driving side rotating member 2 and the driven side rotating member 4 have the same shape and dimensions.
[0016]
The rotational force transmitting member 6 has a convex curved surface having substantially the same shape as an end surface 66 facing the driving side rotating member 2 and an end surface 68 facing the driven side rotating member 4, for example, a convex centered on the center axis 6 '. It is formed in a spherical shape. Thus, the rotational force transmitting member 6 has a shape that is plane-symmetric with respect to a plane parallel to the XY plane, plane-symmetric with respect to a plane parallel with the XZ plane, and plane-symmetric with respect to a plane parallel with the YZ plane.
[0017]
The driving side rotating member 2 and the driven side rotating member 4 are both made of metal such as iron or brass, and the rotating force transmitting member 6 is made of synthetic resin such as polyacetal resin.
[0018]
In the shaft coupling of the present embodiment, when the driving-side rotating member 2 rotates around the driving-side rotation center 2 ′, the rotational force is transmitted from the first slide portion 62 to the rotational force transmitting member 6, and the rotational force is transmitted. The rotational force of the member 6 is transmitted from the second slide portion 64 to the driven-side rotating member 4. At that time, the eccentricity generated between the driving side rotating member 2 and the driven side rotating member 4 is caused by the rotation force transmitting member 6 moving in the direction of the driving side slide groove 22 with respect to the driving side rotating member 2 as described above. Then, it is absorbed by moving in the direction of the driven side slide groove 42 with respect to the driven side rotating member 4. Further, the declination generated between the driving side rotating member 2 and the driven side rotating member 4 is such that the rotational force transmitting member 6 is parallel to the driving side receiving member 24 with respect to the driving side rotating member 2 as described above. By being rotated around the rotation center and being rotated about the rotation center parallel to the driven-side receiving groove 44 with respect to the driven-side rotation member 4, the rotation is absorbed. FIG. 5 shows a state in which the declination θ has occurred. In the present embodiment, since both end surfaces of the rotational force transmitting member 6 have a convex curved surface shape, it is possible to increase the deflection angle θ. The axial movement (end play) generated between the driving side rotating member 2 and the driven side rotating member 4 is caused by the rotation force transmitting member 6 being moved relative to the driving side rotating member 2 by the driving side rotation center 2 as described above. ′, And is absorbed by moving in the direction of the driven-side rotation center 4 ′ with respect to the driven-side rotating member 4.
[0019]
In the present embodiment, the driving side rotating member 2 and the driven side rotating member 4 have the same shape and dimensions. That is, a plurality of objects having the same shape and dimensions are prepared, and one of them can be used as the driving side rotating member 2, and the other can be used as the driven side rotating member 4. In that case, the driving side slide groove 22 and the driven side slide groove 42 correspond, and the driving side receiving groove 24 and the driven side receiving groove 44 correspond. On the other hand, as the rotational force transmitting member 6, a long object having the same cross-sectional shape as that of the rotational force transmitting member 6 and extending long in the direction of the central axis 6 'is prepared. Those cut out so as to have a value can be used. At this time, both end faces may be processed into a required convex curved surface shape. Thus, the shaft coupling of the present embodiment can be easily mass-produced.
[0020]
【The invention's effect】
As described above, according to the present invention, there is provided a shaft coupling that has a simplified structure, is easy to manufacture, and can realize a large tolerance for both eccentricity and declination.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing one embodiment of a shaft coupling according to the present invention.
FIG. 2 is a perspective view showing an assembled state of one embodiment of the shaft coupling according to the present invention.
FIG. 3 is an exploded plan view of an embodiment of a shaft coupling according to the present invention, and a view seen from an axial direction of a driving side rotating member, a driven side rotating member, and a rotating force transmitting member.
FIG. 4 is a plan view showing an assembled state of one embodiment of the shaft coupling according to the present invention.
FIG. 5 is a plan view showing a state in which a deflection angle occurs in one embodiment of the shaft coupling according to the present invention.
[Explanation of symbols]
2 Driving-side rotating member 2 'Driving-side rotating center 4 Driving-side rotating member 4' Driving-side rotating center 6 Rotating-force transmitting member 6 'Center shaft 22 Driving-side slide groove 22a Driving-side slide inner surface 24 Driving-side receiving groove 24a Driving-side receiving Groove inner surface 26 Through hole 28 Screw hole 42 Drive side slide groove 42a Drive side slide inner surface 44 Drive side receiving groove 44a Drive side receiving groove inner surface 46 Through hole 48 Screw hole 62 First slide portion 62a First slide outer surface 64 Second slide portion 64a Second slide outer surfaces 66, 68 End surfaces

Claims (4)

A driving-side rotating member rotating around a driving-side rotation center and a driven-side rotating member rotating around a driven-side rotation center are arranged so as to face each other, and from the driving-side rotating member to the driven-side rotating member. And a shaft coupling in which a rotational force transmitting member is arranged between these so as to transmit the rotational force.
A driving side slide groove is formed in the driving side rotating member so as to face the rotational force transmitting member, and the driving side slide groove is a pair of opposing driving side slides parallel to a plane including the driving side rotation center. With an inner surface,
The driven-side rotating member has a driven-side slide groove facing the rotational force transmitting member, and the driven-side slide groove is a pair of opposed driven-side slides parallel to a plane including the driven-side rotation center. With an inner surface,
The rotational force transmitting member has a first slide portion adapted to the driving side slide groove and a second slide portion adapted to the driven side slide groove, wherein the first slide portion is the driving side slide groove. A pair of parallel first slide outer surfaces slidably in contact with the inner surface, and the second slide portion includes a pair of parallel second slide outer surfaces slidably in contact with the driven slide inner surface. The second slide outer surface is orthogonal to the first slide outer surface, and the rotational force transmitting member has a first slide portion in a cross section orthogonal to both the first slide outer surface and the second slide outer surface. And the second slide portion are shaped so as to form portions that are orthogonal to each other in a cross-shaped cross section,
The driving-side rotating member has a driving-side receiving groove for receiving the second slide portion of the rotational-force transmitting member with a margin, and the driven-side rotating member has the first slide of the rotational-force transmitting member. The driven side receiving groove is formed so that the part can be received with margin.
A shaft coupling, wherein the driving side slide groove and the driven side slide groove have substantially the same groove width. The shaft coupling according to claim 1, wherein the driving-side receiving groove and the driven-side receiving groove have substantially the same groove width. The shape of the end surface facing the driving side rotating member and the end surface facing the driven side rotating member of the rotating force transmitting member are formed in substantially the same convex curved shape. 3. The shaft coupling according to any one of 2. The shaft coupling according to any one of claims 1 to 3, wherein both the driving side rotating member and the driven side rotating member are made of metal, and the rotating force transmitting member is made of synthetic resin.

Images