JPH0242130B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application and Summary of the Invention] The present invention relates to an Oldham joint, in which an intermediate body is interposed between a first main body on the input side and a second main body on the output side. In an Oldham joint in which two main bodies and an intermediate body are engaged so as to be movable relative to each other in a direction perpendicular to the axis, the transmission torque can be increased, the manufacture of the intermediate body is easy, and the assembly of the intermediate body is made possible. This improves the degree of freedom in attachment and facilitates reassembly during disassembly and repair.

[Prior art and its problems] As shown in FIG. 4, the Oldham joint has a flat rectangular prism-shaped projecting piece 41 projecting from the end face of a first main body 1 on the input side, and a second main body 2 on the output side. A flat quadrangular prism-shaped protruding piece 42 protruding from the end face of the
It engages with both end faces of the intermediate body 3, and this engagement portion allows sliding in a direction perpendicular to the axis of the joint.

Therefore, the input shaft M connected to the first main body and the second
Even if the output shaft N connected to the main body 2 is at a different level as shown in FIG. 5, torque can be transmitted.

In the most basic Oldham joint, the intermediate 3
In order to slidably engage the protruding pieces 41 and 42, grooves 51 and 52 extending in the diametrical direction are formed on both end faces thereof. The protruding pieces 41 and 42 slide along the inside of this groove.

In the above-mentioned type, since the groove is open to the periphery of the intermediate body 3, there is a problem in that the torque transmitted from the first main body 1 to the second main body 2 cannot be increased. At the engagement portion between the protruding end, which is the largest torque transmitting part, and the intermediate body 3, the concave groove end that engages with the protruding piece is open to the periphery of the intermediate body 3, so that when a large torque is applied, the concave groove This is because the opposing side walls tend to open with respect to each other, making it impossible to achieve a smooth torque transmission state.

As a solution to this problem,
There is a disclosure in Publication No. 8020, and in this one,
The groove in the portion corresponding to the intermediate body 3 does not open to its periphery. That is, the end of the groove is closed by the outer peripheral wall of the intermediate body 3. and,
When torque is applied from the ends of the protruding pieces 41 and 42, the outer circumferential wall prevents the opposing side walls at the ends of the groove from expanding with respect to each other.

However, with this conventional system, the entire assembly is troublesome, and transmission cannot be achieved when the input and output shafts are slightly bent, making disassembly and reassembly for repair and inspection extremely troublesome. There is a problem.

This means that the portion (mover) intervening in the meshing part between the first main body 1 and the intermediate body 3 and the meshing part between the second main body 2 and the intermediate body 3 is only allowed to move in a direction perpendicular to the axis. However,
This is because these movers are constructed separately from the first main body 1, the second main body 2, or the intermediate body 3.

In particular, the configuration for realizing the forward facing of the engaging portions is such that grooves are formed in the end faces of each main body and both end faces of the intermediate body 3, and a rectangular parallelepiped mover is advanced into the grooves. Since the first main body 1, the second main body 2, and the intermediate body 3 are disassembled, there is an inconvenience that the mover falls out of the groove. In addition, in assembling the entire assembly, there is a problem in that the mover must be accurately assembled in a predetermined position within the groove formed in the end faces of the three members.

The present invention has been made in view of this point, and includes a projecting piece 41 provided on the end surface of the first main body 1.
The protruding pieces 42 provided on the end face of the second main body 2 are disposed facing each other, and these protruding pieces are engaged with each other so as to allow sliding in the radial direction at both ends of the intermediate body 3. In the Oldham joint in which the sliding direction of the protruding piece 42 is perpendicular to that of the intermediate body 3, it is possible to transmit transmission in a manner in which the input shaft and the output shaft slightly intersect, and to generate a sufficiently large torque. In addition to making it possible to transmit the information, the overall assembly becomes easier, and
The objective is to improve the degree of freedom in assembling the intermediate body 3.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problems are as follows.
0, and a protruding piece 41 protruding from the end face of the first main body 1 and a protruding piece 42 protruding from the end face of the second main body 2 are fitted from both ends of the through hole 50, and the through hole 50 is The major axis of the cross section is set to be longer than the major axis of the cross section of each protruding piece, and the sum of the protruding lengths of the opposing parts of the protruding pieces is set to be smaller than the axial length of the through hole 50.

[Operation] The above technical means of the present invention operates as follows.

A through hole 50 with a cross-shaped cross section is formed in the intermediate body 3, and protruding pieces 41 are formed from both ends of the through hole 50.
When the protruding pieces 42 are inserted in positions perpendicular to each other, the first main body 1, the second main body 2, and the intermediate body 3 are assembled in a predetermined relationship.

Also, when disassembling the shaft coupling when used in a device where the output shaft side is fixed, if the first main body 1 is pulled out from the intermediate body 3, only the first main body 1 can be taken out, and it cannot be reused. When assembling, the protruding piece 41 may be inserted from the end of the through hole 50 as it is.

Furthermore, the entire outer periphery of the through hole 50 in the direction perpendicular to the axis is surrounded by a wall. Therefore, the torque at each meshing portion is transmitted through the entire surrounding wall of the through hole 50. Further, since the sizes of the protruding pieces 41 and 42 are set to predetermined values in relation to that of the through hole 50, the first main body 1 and the second main body 2 can slide against the intermediate body 3. Not only is it possible, but it can also be moved by swinging.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

The entire assembly can be properly assembled by simply inserting the protruding pieces 41 and 42 in mutually perpendicular positions, making the entire assembly easier than conventional ones. At this time, as long as the first main body 1 and the second main body 2 satisfy the above-mentioned conditions, there are no restrictions on the assembly posture of the intermediate body 3, so that no assembly errors occur.

Moreover, since nothing falls off from the first main body 1, second main body 2, and intermediate body 3 during disassembly, reassembly after disassembly is also easy.

Furthermore, the first main body 1 and the second main body 2 are intermediate 3
Since the input shaft and the output shaft can be slid against each other and can be oscillated, torque can be transmitted smoothly both when the input shaft and the output shaft are in a different level state and when they are in an crossed state.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

In this embodiment, as shown in FIG. 2, the intermediate body 3 has a cylindrical body formed with a through hole 50 that penetrates in the axial direction, and as shown in FIG. A protruding piece 41 of the first main body 1 and a protruding piece 42 of the second main body 2 are fitted.

As shown in FIG. 2, in the through hole 50, a pair of mutually opposing hole portions 53, 53 and another pair of mutually opposing hole portions 54, 54 are continuous at the center. The pair of holes 53,
Diametrically opposite walls 5,5 of the intermediate body 3 at 53
The mutual spacing and the pair of holes 54, 54 correspond to the through holes 5 described in the technical means section.
The major axis is 0.

On the other hand, the first main body 1 and the second main body 2 have the same configuration, and as shown in FIG. 1, a shaft connecting part A for connecting an input shaft or an output shaft is connected to one of the disc-shaped parts However, a flat rectangular prism-shaped protrusion piece 41 or protrusion piece 42 is made to protrude from the other side of the disc-shaped part. The length of each protruding piece in the diametrical direction of the disc-shaped portion becomes the major axis of the protruding piece described in the technical means section.

In this embodiment, the protruding pieces 41 and 42 are shaped to have a recess 40 at the center of their tips, and in this embodiment, the height from the base end of the protruding piece to the bottom surface of the recess is The length of the intermediate body 3 is set to be less than half, and the total height of each protruding piece is set to be greater than half the length of the intermediate body 3.

Therefore, as explained in the operation section, relative sliding similar to the conventional Oldham joint is possible, and the first main body 1 and the second main body 2 can swing relative to the intermediate body 3. .

Further, in this embodiment, both ends of the protruding piece 41 and the protruding piece 42 are in a state of being bitten into opposite sides. That is, both ends of each protruding piece are in a state of protruding toward the proximal end of the protruding piece rather than the distal end of the other protruding piece.

Therefore, in the case of this embodiment, the holes 53, 5
4 is in the torque transmission state 54
At this point, the tip of the protruding piece 41 and the tip of the protruding piece 42 are partially compressed, and from this point of view, it becomes difficult for the opposing walls of the wall surfaces forming the grooves 51 and 52 to spread out from each other. As a result, the transmitted torque becomes even larger.

In addition, in the Oldham joint, the projecting pieces 41, 42
The side surfaces of the grooves 51 and 52 (opposing wall surfaces) come into sliding contact with each other, but in the case of an Oldham joint that rotates at high speed, as shown in FIG. 3, the first and second main bodies 1, 2 and intermediate body 3 are made of aluminum or an alloy thereof, the sliding contact surface is coated with a low-frictional resistance resin immersion layer 60 impregnated to a certain depth with a low-frictional resistance resin such as tetrafluoroethylene. When formed, the sliding resistance between the protrusions 41 and 42 and the intermediate body 3 is reduced, the torque transmission efficiency is improved, and the product can withstand high-speed rotation.

As a similar sliding resistance reduction measure, instead of the low frictional resistance resin immersion layer 60, the protrusions 41, 42
It is also possible to adopt a configuration in which a spacer is interposed between the sliding surfaces of the intermediate body 3 and the intermediate body 3 to reduce frictional resistance. For this purpose, a plate-shaped spacer with low frictional resistance may be attached and fixed to either one of the mutually sliding surfaces.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of an intermediate body 3 used therein, Fig. 3 is a sectional view taken along line XX, and Figs. can be,
In the figure, 1... first main body, 2... second main body, 3... intermediate body, 41, 42... protruding piece, 50... through hole.

Claims (1)

[Claims] 1 The protruding piece 41 provided on the end face of the first main body 1 and the protruding piece 42 provided on the end face of the second main body 2 are arranged oppositely, and these protruding pieces are slidable in the radial direction at both ends of the intermediate body 3. In an Oldham joint of the type in which the sliding direction of the protruding piece 41 with respect to the intermediate body 3 is orthogonal to that of the protruding piece 42 with respect to the intermediate body 3, the intermediate body 3 is
A hollow body having a through hole 50 with a cross-shaped cross section,
The protruding piece 41 protruding from the end face of the first main body 1 and the protruding piece 42 protruding from the end face of the second main body 2 are fitted from both ends of the through hole 50, and the major axis of the cross section of the through hole 50 is adjusted to the length of each protruding piece. The Oldham joint is set to be longer than the major axis of the cross section, and the sum of the protruding lengths of the opposing parts of each protruding piece is set to be smaller than the axial length of the through hole 50.