JPH07224847A - Oldham's coupling - Google Patents

Abstract

PURPOSE:To prevent separation and dismantlement of a coupling in a removed state. CONSTITUTION:An Oldham's coupling comprises a pair of hubs 1a and 1b; and a spacer 2 in the shape of a regular square arranged in the middle therebetween. The hubs 1a and 1b comprise a boss part 12 fitted in the ends of shafts; and a finger part 11 radially opened and connected to the boss part and paralleling the spacer 2 and slidably fitted in. A cover plate 3 slightly protruded internally is attached to the tip of the finger party 11 by means of bolts 4 and the head of the bolt 4 forms a stopper to prevent slip-off of the mating hub.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft joint attached to a drive shaft, and more particularly to an Oldham's joint that absorbs a deviation of a shaft center between a drive shaft and a driven shaft.

[0002]

2. Description of the Related Art The Oldham coupling is a kind of shaft coupling provided on a drive shaft, and is known to be capable of absorbing a deviation of a shaft center when a drive shaft and a driven shaft are kept in parallel. Examples of typical Oldham's joints are shown in FIGS. 8 and 9. In a narrow sense, the one shown in FIG. 8 may be called an Oldham's joint and the one shown in FIG. 9 may be called an American joint. 8 (a) and 9 (a) are states in which these Oldham joints are axially separated at their joint portions, and FIGS. 8 (b) and 9 (b) are perspective views showing the respective assembled states. is there.

The structure and operation will be described with reference to FIG. 8. A pair of hubs 5 and 5 mounted on the ends of the drive shaft and the driven shaft respectively have linear grooves 51 having a constant width in the diametrical direction. Are provided, and linear protrusions 61 that fit into the grooves 51 are provided on both sides of the disk-shaped spacer 6 inserted in the middle thereof, and the protrusions 61 are provided on both sides of the intermediate member 6. , 61 have a 90 ° phase difference, so even if the axis of the shaft changes while the driving shaft and the driven shaft remain parallel, the deviation is caused by the hubs 5, 5 and the intermediate member 6 with the groove 51. It is absorbed by sliding with the protrusion 61, and the torque is transmitted without any trouble.

The Oldham coupling (American joint) shown in FIG. 9 is a groove 51 of the hub in the Oldham coupling shown in FIG.
In addition, the width of the protrusion 61 of the spacer 6 is increased to eliminate the disk portion of the spacer 6 so that the spacer 6'has a square plate shape, and the hub 5'is connected to the boss portion fitted to the shaft end. It consists of diametrically opened fingers that slidably fit parallel opposite sides of 6 '. The basic functions of torque transmission and absorption of shaft misalignment are the same as those in Fig. 8, but the bearing length is short. Since the spacer 6'has a simple shape, it has the advantages of a simple structure and easy processing.

[0005]

By the way, FIG. 8 and FIG.
As can be seen from the above, the Oldham coupling is easily disassembled by separating the hubs on both sides in the axial direction.
Therefore, before and after being assembled to the drive shaft, the Oldham coupling is easily disassembled and disassembled when it is carried by itself or placed on a shelf. Further, even when one shaft is moved forward and backward like a mechanical clutch to use, the intermediate material falls off, which is inconvenient.

Further, although the deviation of the shaft core while the driving shaft and the driven shaft are kept parallel to each other can be absorbed, the bending of the shaft core, which is more likely to occur than the parallel deviation as the actual misalignment, cannot be dealt with. was there. The present invention solves these problems and is difficult to disassemble in the removed state,
Moreover, it is an object of the present invention to realize an Oldham coupling improved so as to absorb bending of the shaft.

[0007]

The first Oldham coupling of the present invention comprises a pair of hubs each attached to the shaft end of a driving shaft or a driven shaft, and a square plate member arranged in the middle thereof. An Oldham coupling comprising a spacer, the hub being a boss portion fitted to a shaft end, and a diametrically opening finger portion which is connected to the boss portion and slidably fits the parallel opposite sides. In the above, at the tip of the finger portion, a protruding portion slightly protruding inward is formed, and at the tip of the finger portion, a projection protruding in the axial direction is provided, and for example, at the tip of the finger portion, The inward projecting part is formed by attaching a cover plate protruding slightly inward to the tip of the finger part with a bolt, and projecting the head part of this bolt in the axial direction to form a shaft. Whether it is a projection toward the front or whether the inward projection of the tip of the finger part is formed integrally with the finger part and a projection projecting in the axial direction is provided at the tip. The boss and the hub body including the fingers are made of different materials and are integrally connected, or a spacer made of a square plate material is used in a slit, hole, or plate penetrating in the plate thickness direction. Voids such as grooves cut in the thickness direction are processed into a symmetrical shape with respect to a center line passing through the center of each side of a square or a diagonal line connecting each vertex.

[0008]

[Operation] According to the present invention, the spacer and the hub are axially separated, although the spacer and the hub are slidable in the radial direction by forming the projections that slightly project inward at the tips of the finger portions of the hub. In addition, by providing a projection protruding in the axial direction at the tip of the finger portion, this projection serves as a stopper that limits the radial movement of the hub on the other side and falls off due to the radial movement. Since there is no separation, even if the joint is carried around alone, there will be no trouble such as the parts coming apart.

[0009]

【Example】

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. This Oldham joint is an improvement of the Oldham joint (American joint) shown in FIG. 9. FIG. 1 is a front view of the assembled state, and FIG. 2 is a side view taken along the line AA of FIG.
1 (1a, 1b) is a hub, 2 is a spacer, 3 is a cover plate, 4 is a bolt, and S is a drive shaft or a driven shaft.

FIG. 3 is a front view with one hub removed for the sake of explanation, and FIG. 4 is a side view taken along the line BB of FIG. Hubs 1a and 1b having the same structure are assembled on both sides of the square spacer 2 with a 90 ° phase shift therebetween. At the tip of the finger portion 11 of the hub 1,
A crescent-shaped cover plate 3 is attached by bolts 4 so as to project slightly inward from the position 11. The spacer 2 is fitted in the finger portion 11 of the hub 1 so as to be slidable in the radial direction, but is restrained by the cover plate 3 in the axial direction.

However, with this alone, when the spacer 2 is moved in the radial direction until it comes off the finger portion 11 of the hub 1, the spacer 2 is also separated. In the state of FIG. 1, the hub on the left side
1a is slidable in the vertical direction in the figure, and the right hub 1b is slidable in the direction perpendicular to the paper surface. Taking the left hub 1a as an example, the head of the bolt 4 attached to the mating hub 1b is shown. The portion serves as a stopper in the sliding direction, and the hub 1a hits against this and cannot move any further. That is, the distance indicated by the dimension d in the figure is the movement allowance.

Therefore, the Oldham coupling of the present invention has a limited moving distance in the radial direction and will not fall out. That is, this Oldham coupling is restrained in both the axial direction and the radial direction in the assembled state, and is not separated or disassembled during handling. If the hub 1 is made of metal in consideration of reducing the frictional resistance of the sliding portion, lubricity, compressibility, etc., the spacer 2 is made of resin, for example, fluororesin or synthetic rubber. Is good.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a front view showing the hub 1'of this embodiment, and the cover plate 3 attached by the bolt 4 in the first embodiment.
Is formed integrally with the hub body. Whether such a hub is made of metal or resin, it can be machined or molded. However, if all the protrusions 13 are formed integrally with the hub body, the assembly work itself of this joint is difficult, so at least one of the four cover plates for at least one joint is bolted. Assembling is easy by using the mounting structure according to (1), and the spacer can be assembled by using a resin and using the flexure or by flexing the protruding portion 13 itself of the hub.

In this case, it is necessary to attach a stopper 4'in place of the bolt 4 with an adhesive or the like in order to prevent it from falling off in the radial direction. Third Embodiment A third embodiment of the present invention will be described with reference to FIG. This figure is a cross-sectional view of the hub 1 "in this embodiment. When the spacer is made of metal, it is preferable that the hub side, which is the mating member of the sliding portion, be made of resin. It is divided into a boss portion 12 to be mounted and a hub body 10 including a finger portion 11, the boss portion 12 is made of metal, and the hub body 11 is made of resin. Are united together.

Embodiment 4 As described above, torque transmission in the Oldham coupling is performed through the spacer 2, but axial force transmission is not performed in principle. Therefore, a square plate-shaped spacer is used. By processing the voids 21 such as slits, holes, and grooves in the plate thickness direction, the compressibility in the plate thickness direction can be changed without impairing the rigidity in the rotation direction. Figure 7
(A) to (f) are spacers 2 that have been subjected to such processing.
It is a perspective view showing an example of, and various shapes other than this are conceivable. The processing of the void portion 21 may be performed by machining, but regardless of whether it is made of metal or resin, compression molding, sintering,
By injection molding (metal injection in the case of metal) or the like, processing can be performed at low cost and in an arbitrary shape.

In any case, the spacer 2 is bent or unevenly compressed by subjecting the center line passing through the center of each side of the square or the diagonal line connecting the vertices to a symmetrical shape. As a result, a bending displacement between the driving shaft and the driven shaft can be allowed, and a damping effect can be provided to damp the bending displacement.

[0017]

EFFECTS OF THE INVENTION According to the present invention, there is an excellent effect that an Oldham coupling improved so as not to be separated / disassembled even in a detached state and capable of absorbing bending of a shaft is realized.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is a front view showing a part of the first embodiment of the present invention.

FIG. 4 is a side view taken along the line BB of FIG.

FIG. 5 is a front view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a perspective view showing a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional technique.

FIG. 9 is a perspective view showing a conventional technique.

[Explanation of symbols]

 1 Hub 10 Hub Main Body 11 Finger Part 12 Boss 13 Projection Part 2 Spacer 21 Void Part 3 Cover Plate 4 Bolt 4'Stopper 5 Hub 51 Groove 6 Spacer 61 Projection

Claims (5)

[Claims] 1. A pair of hubs (1a, 1b), each of which is attached to a shaft end of a drive shaft or a driven shaft, and a spacer (2) made of a square plate material disposed in the middle thereof, The hub comprises a boss portion (12) fitted to the shaft end, and a diametrically open finger portion (11) slidably fitted to the opposite side parallel to the spacer (2) connected to the boss portion (12). In this Oldham coupling, the protrusion (3, 13) slightly protruding inward is formed at the tip of the finger (11), and the finger (11) is also formed.
An Oldham coupling characterized in that a projection (4, 4 ') protruding in the axial direction is provided at the tip of the. 2. The inward protruding portion of the tip of the finger portion (11) is formed by attaching a cover plate (3) slightly protruding inward to the tip of the finger portion with a bolt (4). The Oldham coupling according to claim 1, wherein the head of the bolt (4) is axially projected to form a projection in the axial direction. 3. An inwardly projecting portion (13) of the tip of the finger portion (11) is formed integrally with the finger portion (11), and a projection (4 ') projecting in the axial direction is provided at the tip thereof. The Oldham's joint according to claim 1. 4. A hub boss portion (12) and a finger portion (1)
The Oldham coupling according to any one of claims 1 to 3, wherein the hub body (10) including 1) is formed of a different material, and both are integrally connected. 5. A spacer (2) made of a square plate material.
, Symmetric with respect to the center line that passes through the center of each side of the square or the diagonal line that connects the vertices of the voids (21) such as slits, holes that penetrate in the plate thickness direction, or grooves that are cut in the plate thickness direction. The Oldham coupling according to any one of claims 1 to 4, which is processed into the shape of.