JPS62110026A - Rotating power transmitting mechanism - Google Patents

Abstract

PURPOSE:To prevent generation of a crack, breakage, etc. by providing a projected part and a recessed part which are engaged with each other, on a rotary shaft and making the whole periphery of the side face of the projected or recessed part receive stress. CONSTITUTION:When a first rotary body 1 is rotated, projected bodies 11, 12 which are fitted in the groove 6 of the rotary body 1, are also rotated accompanying the rotation of the first rotary body 1. However, since the projected bodies 11, 12 are fitted in a second rotary body 2 rotatably by themselves, even if the side faces of the projected bodies 11, 12 which are in contact with the inner wall of the groove 6, are subjected to stress generated in the groove 6, the stress can be dispersed due to the rotation of the projected bodies themselves. Accordingly, as the stress can be relaxed, a crack will not be generated on the rotary body.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a slider shaft joint that transmits rotation from one shaft to another shaft, particularly to parallel shafts having different axes.

(Prior Art) Conventionally, as a means of transmitting rotation with a constant angular velocity from one axis to the other of mutually parallel axes, although the axes do not coincide,
There is an Oldham fitting. This is a combination of two joints shown in FIG. 9 to transmit rotation from one to the other. That is, one set has a groove (O) in a plane perpendicular to the rotation axis [F] of one rotating body (4), and the other rotating body (8) has a protruding lip 0 that fits into the groove 0. A protruding lip is similarly provided on the back surface of the rotating body (B), and this lip fits into the groove of the other rotating body. In Fig. 9, (a) shows the disassembled state and (b) shows the combined state.

(Problem to be solved by the invention) However, in the above case, due to the rotation of the rotating body (B),
The protruding lip 0 of this rotating body (2) contacts the groove (C), and stress is concentrated at the contact point furthest from the center of rotation of the inner wall of the groove 0. Due to this concentration, in the event of excessive torque,
Plastic deformation or cracks occur around that point. For this reason, the Oldham joint needs to have a certain diameter depending on the transmitted torque.
The disadvantage is that the moment of inertia increases, making it unsuitable for high-speed rotation.

The present invention aims to improve the above-mentioned drawbacks of the conventional joints, and provides a joint with a small diameter and a large transmission torque.

(Means for solving the problem) Protrusions and recesses that engage with each other are provided on opposing surfaces perpendicular to the rotation axis of the rotating body, and when one of them is engaged, it rotates at that position or faces the other. As something that can slide linearly along a surface, rotation is transmitted from one axis to the other.

(Function) With the above structure, when the protrusion and the recess are engaged and locked, one of them rotates or slides, so the stress is applied by the entire circumference of the side surface of the protrusion or the recess. When molded from metal, plastic deformation is prevented, and when molded from ceramic, cracks and destruction do not occur. , a small size and suitable for high speed rotation can be obtained.

(Example) This invention will be explained with reference to an example shown in the drawings. In the embodiments shown below, the same parts will be described using the same part numbers.

FIG. 1 shows a first embodiment of the present invention, which is an Oldham joint. (1) is a first rotating body having a groove (6) in the center, and (4) is its rotating shaft.

(2) is a second rotating body, which is formed into a disk, with circular holes provided on both sides perpendicular to the rotation axis, and a protruding body (7) so that it can rotate.
) (sr is not inserted, and its protruding body (71 (81) is formed with a rib 0η (2) that fits into the groove (6). Similarly, the opposite side of the second rotating body (2) There are protrusions (91
(101 is rotatably fitted, and its protruding body (91+10
1 forms a lip α] α fathom, and a rib (to) α4,
It is fitted into a # (to) provided on the opposing surface of the third rotating body (3). (5) is the rotational axis of the third rotating body (3), and although the axes do not coincide with the rotational axis (4) of the first rotating body (1), they are parallel to each other.

Thus, the first rotating body (1), the second rotating body (2), and the third rotating body
The rotating bodies (3) are meshed with each other, and the first rotating body (1
), the protrusion αυ fits into the groove (6).
(2) rotates in accordance with the rotation of the first rotating body (1), but since the protruding body (+1) is fitted into the second rotating body (21) so that it can rotate itself, 1ll( Even if the side surfaces of the protrusions α1)Q and 5 that come into contact with the inner wall of the groove (6) are subjected to the stress generated in the groove (6), the stress is dispersed and alleviated by their own rotation. Similarly, with respect to the third rotating body (3), the protruding body (9) and QO fitted on the opposite surface of the second rotating body (2) so as to be able to rotate are also prevented. )'s rib (2) a4 fits into H (1'J) of the third rotating body (3), so the rotation of the second rotating body (2) is smoothly transmitted to the third rotating body. becomes.

What is shown in FIG. 2 is a second embodiment, in which the first rotating body f
When transmitting rotation to the il and the second rotating body (2), the groove (
6), the first rotating body (1) is provided with a recess (6'x6') into which the ribs aη (6) of the two protrusions (7) fit, and as shown in Fig. 2(b). ), as shown in the above recessed hole (6
') (6') are provided to be offset to the left and right from a center line passing through the axial center of a plane perpendicular to the rotation axis.

Even with this configuration, rotation can be transmitted from the rotating shaft (4) on the same axis to the rotating shaft (5) as shown in FIG. 2.

The third embodiment in FIG. 3 shows a case where the first rotating body (1) is a sphere, and (a) is the first rotating body (1), a part of which is made into a flat surface. A groove (6) is provided, and a rotatable protrusion (71 (8)) is provided in a plane perpendicular to the rotation axis of the disc-shaped second rotating body (2), and each rib αυ (
6) into the groove (6), the second rotating body (2
It's number 1.

What is shown in Fig. 4 is a fourth embodiment of the Oldham joint, in which a protruding body (71 (81) of the second rotating body (2) is inserted into the groove (6) of the first rotating body (1). A concave hole (σ
A support α0αQ provided with The protruding body (71 (81) fits into the second rotating body (2)
A protruding body (9) protruding and fixed on the opposite surface of [++ is the same,
The support body is slidably fitted into the groove α of the third rotating body (3) and is fitted into the recessed hole (1) of the barrel αηα.

In this way, the groove (
6) While dispersing and relaxing the stress by sliding the support body (a) αQαf) at (to), the second rotating body (2)
4 protrusions (71 (81 (9) QO
Rotation is transmitted from IK.

In the fifth embodiment shown in FIG. 5, instead of the support (g) αQ sliding in the groove (6) of the first rotating body (1) in the fourth embodiment, A support (6') that is movably fitted into recessed holes (6') (6') provided on a plane perpendicular to the axis and located on opposite sides of a center line passing through the center of the rotation axis. To) αQ, and the support body (to) Q4
Fixed protrusions (7) (81) provided on a plane perpendicular to the rotational axis of the second rotary body (2) are fitted into the concave holes (6'') of No. 3, respectively.The operation thereof is similar to that of the fourth embodiment. It is the same as (a)
is an exploded view, and (b) is the first. A state in which the second rotating body is engaged is shown.

FIG. 7 is a front view of the first rotating body (1) in FIG. 4, and FIG. 8 shows a case where the first rotating body (1) is a sphere.

The sphere can also be configured as a cylinder.

In the embodiments described above, the constituent material can be made of ceramic. Ceramic generally has a low elastic modulus, so it is easy to concentrate stress, and if an Oldham joint, for example, is made of such a material, cracks will occur or breakage will occur. There is no rack or the like, it is compact and can transmit rotation with a large torque, and the characteristics of ceramic, such as light weight and heat resistance, can be fully utilized.

In addition, when it is made of metal, plastic deformation does not occur in the engaging portion, and it is of course possible to transmit rotation with a large torque in a small size as described above.

(Effects of the Invention) As described above, the present invention has the excellent effect of being able to transmit rotation with a large transmission torque in a small size, and also being able to use ceramic materials.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the first embodiment of the present invention, Fig. 2(a)
Co) (c) shows the second embodiment, Fig. 3 shows the spherical rotating body of the third embodiment, Fig. 4 shows the fourth embodiment, and Fig. 5 shows the fifth embodiment. Figure 6 shows Figure 5 and Figure 7.
The figures are a front view of the first rotating body in FIG. 4, FIG. 8 is a perspective view of a spherical one, and FIG. 9 shows a conventional Oldham joint. DESCRIPTION OF SYMBOLS 1... First rotating body, 2... Second rotating body, 3... Third rotating body, 4.5... Rotating shaft, 6.19... Groove, 6
'...Concave hole, σ'...Concave hole, 7, 8.9.10 ・
・Protruding body, 1), 12゜13.14 ・・・Rib,
15.16.17.18 ...Support. Patent applicant Representative patent attorney Miyuki Fujiki Figure 1 Figure 3 (o)
(b) Figure 2 (a) Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) A protrusion and a recess that engage with each other are provided on the opposing surfaces perpendicular to the rotation axis of the rotating body, and in the engaged state, one of them rotates at that position or slides along the opposing surface. A rotary power transmission mechanism that transmits rotation from one shaft to the other. (2) Claim 1 in which the rotating body is made of ceramic
The rotary power transmission mechanism described in .