JPH0262730B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to an Oldham joint, and includes a first main body on the input side and a second main body on the output side that constitute the Oldham joint, and the first main body and the second main body on the output side. In the engagement with the intermediate body interposed between the main body and the intermediate body, the heat dissipation generated in the sliding part in the direction perpendicular to the rotation axis is promoted, and the sliding part is overheated, resulting in poor transmission and reduced durability. This is to prevent

[Prior art and its problems] A normal Oldham joint is constructed as shown in FIG. 9, and includes a first main body 1 connected to the input shaft side,
It consists of a second main body 2 connected to the output shaft, and an intermediate body 3 that engages with these first and second main bodies 1 and 2. Similar protruding pieces 42 provided on the surfaces are orthogonal to each other, and one protruding piece 41 is placed in the groove 51 formed on the end face of the first main body 1, and the other protruding piece 41 is placed in the groove 52 formed on the other second main body 2. The pieces 42 are fitted into each other in a mating state, and when the first main body 1, intermediate body 3, and second main body 2 are engaged, the input shaft and the output shaft are in a stepped state as shown in FIG. Torque is transmitted even under conditions where the

However, this conventional Oldham joint has a problem in that the transmitted torque cannot be increased.

The parts of the protrusions 41, 42 that contribute most to torque transmission are their both ends, and since the protrusions 41, 42, including these parts, are only fitted into the grooves 51, 52, the parts that contribute most to torque transmission are the two ends. This is because the grooves 51 and 52 tend to be open, and this tendency is particularly noticeable at both ends of these grooves.

In order to solve this problem, we have already proposed Japanese Patent Application No. 60-20640, and this application includes the following:
A configuration as shown in FIGS. 11 and 12 has been proposed, in which the intermediate body 3 is configured to have a cross-shaped through hole 5, and the first main body 1 is provided with a protruding piece 41. The second main body 2 adopts a configuration in which projecting pieces 42 are respectively provided.

In this case, a hole portion 53 constituting the through hole 5,
The protruding piece 41 is fitted into the hole 53, and the protruding piece 42 is fitted into the other hole 54, 54 in a mating state, respectively, so that the same torque transmission effect as in the conventional example described above is obtained, and moreover, the most Since the outer periphery of the intermediate body 3, which has a large torque, is integrally connected, each hole is difficult to deform (the distance between opposing walls of the hole is difficult to widen), and the transmitted torque is large.

However, in the prior example, when the input shaft and the output shaft are at different levels during transmission, the protrusions 41 and 4
Frictional heat generated in the sliding portion between the holes 53 and 54 is difficult to dissipate, and the sliding portion is likely to be damaged. As a result, if smooth transmission operation is to continue, its durability will be low. This is because the outer periphery of the sliding portion between the projections 41, 42 and the holes 53, 54 is closed, and the heat capacity of the outer wall portion of the sliding portion is large.

[Technical Problem] The present invention is directed to the following: "The protruding piece 41 formed on the first main body 1 and the protruding piece 42 formed on the second main body 2 are made to face each other perpendicularly, and these protruding pieces In the Oldham joint, which is slidably fitted into a cross-shaped through hole 5 formed in the intermediate body 3, in order to improve durability, it is necessary to make it easier to dissipate the frictional heat generated in the sliding part. This is a technical issue.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned technical problem is ``a ventilation hole that opens to the outside in the flesh between the hole 53 and the hole 54 that constitute the through hole 5''. 3
1 was opened.

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

In the transmission state, the projecting piece 41 of the first main body 1 is slidably fitted into the holes 52 and 53 of the through hole 5,
The protruding piece 42 of the other second main body 2 has holes 54, 54.
When the input shaft and the output shaft are slidably fitted into the intermediate body 3 and the input shaft and the output shaft are at different levels, in the fitting portion, there is no relative sliding between the first main body 1 or the second main body 2 and the intermediate body 3. movement occurs, and frictional heat is generated. However, since there is a ventilation hole 31 in the flesh between the hole 53 and the hole 54 in the circumferential direction of the intermediate body 3, the air flow passing through the ventilation hole 3 is As a result, the meat portion is air-cooled and the heat dissipation effect is promoted.

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

Hole 53 and hole 5 in the circumferential direction of intermediate body 3
The meat part between 4 is the ventilation hole 3 provided in that part.
The meat part is air-cooled by the airflow passing through the body 1, and the heat dissipation effect of the frictional heat generated during transmission is promoted, so that the transmission part that meshes with the first and second main bodies 1 and 2 and the intermediate body 3 is not overheated. This makes it possible to prevent thermal damage to the relative sliding parts and improve durability.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 8.

In the first embodiment shown in FIGS. 1 and 2, ventilation holes 31, 31 formed in the intermediate body 3 are passed through in parallel to the axial direction of the intermediate body 3, and are formed in a cross shape. Two ventilation holes 31 are provided in each of the fan-shaped side wall portions 32, 32 formed between the hole portions 53, 53 and the hole portions 54, 54 constituting the hole 5, respectively.
31 is formed through it.

On the other hand, the first and second main bodies 1 and 2 are configured in a similar disk shape, and a pair of shaft bodies 40,
40 is caulked, and this shaft body 40,
40 is disposed on the diameter line of the main body portion to form the aforementioned protrusion piece 41 or protrusion piece 42. For this reason, as shown in FIG. 2, parallel surface portions S, S are formed on each of the shaft bodies 40, 40, and anti-friction sheets 6, 6 are attached to these parallel surface portions S, S. A plane connecting the parallel surface portions S, S on one side of the pair of shaft bodies 40, 40, and a parallel surface portion S, S on the other side.
The planes that connect each other are parallel to each other,
Moreover, it is set parallel to a line connecting the centers of the shaft bodies 40, 40. Further, the distance between the surfaces of the anti-friction sheets 6, 6 attached to the parallel surface portions S, S of each shaft body 40 is the same as the distance between the opposing walls constituting the hole 53 or hole 54 of the intermediate body 3. It has been matched.

Further, the distance between the tips of the holes 53, 53 and the distance between the tips of the holes 54, 54 are determined by the shaft 4.
0 and 40, so that the first main body 1 or the second main body 2 and the intermediate body 3 have a margin for mutual movement in the radial direction.

In the first embodiment, as shown in FIG.
Alternatively, if it is fitted into the holes 54, 54, it becomes an Oldham joint. In this embodiment, a through hole H for inserting a shaft fixture is formed in the center of the first and second main bodies 1 and 2, and the input shaft N and output shaft M are connected in a transmission state. To do this, use a shaft fixture that utilizes the taper fitting effect as shown in the figure.

This shaft fixing tool has inner rings 7 that are tapered fitted to each other.
1 and an outer ring 72, and when a plurality of tightening bolts 73, 73 interposed between the two are tightened, the inner ring 71 fitted on the input shaft N or the output shaft M is pressed against each shaft, and the other outer ring 72 is brought into pressure contact with the inner periphery of the through hole H of the first main body 1 or the second main body 2, and the frictional force of these pressure contact parts causes the torque transmission state to be established.

In the first embodiment, the protruding piece 41 or the protruding piece 42 is constructed by implanting the shaft bodies 40, 40 in the disk-shaped first main body 1 or second main body 2. Compared to the previously described conventional example in which protrusions are formed directly on the first main body 1 or the second main body 2, processing is easier and productivity is higher.

Next, in the second embodiment shown in FIG.
is formed through the intermediate body 3 in the radial direction at the flesh portion 32, and this embodiment also functions in the same manner as the first embodiment. Particularly in the case of this embodiment, a radial air flow passing through the ventilation holes 31 is likely to occur as the intermediate body 3 rotates, and the heat dissipation effect is higher than that of the first embodiment.

Next, in the third embodiment shown in FIGS. 5 to 8, the anti-friction sheet 6 and its mounting structure have been devised, and the anti-friction sheet 6 is attached to the surface of a thin metal plate. Composite anti-friction plate 6 having an anti-friction layer 62 formed thereon
3, this composite anti-friction plate was processed to have bent pieces 61, 61 at both ends as shown in FIG. It was designed to do so.

Therefore, in this embodiment, the composite anti-friction plate 6
3 has a structure in which a bronze layer 65 is formed on a base material 64 made of a steel plate, and a fluorine-based synthetic resin layer having an excellent anti-friction function is integrally attached to the surface of the bronze layer 65. Cut the grinding plate 63 into a predetermined size,
When bent into a predetermined shape by press working, it becomes an anti-friction member 66 having bent pieces 61, 61 as shown in FIG.

Next, in order to simplify the attachment of the anti-friction member 66, in this embodiment, recesses shallower than the thickness of the composite anti-friction plate 63 are formed on both end surfaces of the intermediate body 3.
As a result, slight step portions 33, 33 protruding toward the end surface are formed on the inner and outer peripheral portions of the intermediate body 3, and the distance between these step portions is adjusted by the anti-friction member 66.
It is adapted to the length of.

Therefore, when the anti-friction members 66, 66 are fitted between the step portions 33, 33 on the opposite walls of the holes 53, 54, and the protrusions corresponding to the holes 53, 54 are fitted, these anti-friction members 66, 66 are attached in a manner that prevents them from coming off, and the anti-friction layer provided on the anti-friction member 66 comes into contact with the side surfaces of the protrusions 41, 42.

In particular, in this embodiment, the anti-friction layer 62 is also provided on the surface side of the bent pieces 61, 61, and the stepped portion 3
3 and 33 are set to be thinner than the thickness of the composite antifriction plate 63, the end surface of the intermediate body 3 and the end surface of the first and second main bodies 1 and 2 are in direct contact with each other when the Oldham joint is assembled. When there is no friction and they can contact each other, they come into contact with each other with the anti-friction layer 62 interposed therebetween. Therefore, even if the axis of the Oldham joint is vertical, the first and second main bodies 1,
It is possible to prevent wear of the end faces due to direct contact between the intermediate body 2 and the intermediate body 3 and generation of noise due to the contact.

The attachment structure of this embodiment, in which the anti-friction member is bent and fitted in accordance with the thickness of the intermediate body 3, constitutes an invention separate from the invention described above.

[Brief explanation of drawings]

Fig. 1 is an exploded view of the first embodiment of the present invention, Fig. 2 is a perspective view of the shaft body 40, Fig. 3 is a sectional view of this embodiment in use, and Fig. 4 is used for the second embodiment. An explanatory diagram of the intermediate body 3, FIGS. 5 to 8 are explanatory diagrams of the third embodiment, FIGS. 9 and 10 are explanatory diagrams of the conventional example, and FIGS.
Fig. 1 and Fig. 12 are explanatory diagrams of a previous example which is an improvement of this conventional Oldham joint, and in the figures, 1...first main body, 2...second main body, 3...intermediate body, 31... Ventilation hole, 41, 42... protrusion, 5...
...Through hole, 53, 54... Hole portion.

Claims (1)

[Claims] 1 A cross-shaped through hole 5 formed in the intermediate body 3 by making the protruding piece 41 formed on the first main body 1 and the protruding piece 42 formed on the second main body 2 face each other perpendicularly, and forming these protruding pieces on the intermediate body 3. This Oldham joint is slidably fitted into the Oldham joint, and has a ventilation hole 31 opened to the outside in the flesh between a hole 53 and a hole 54 forming a through hole 5.