JPH02195023A - Oldham coupling - Google Patents

Abstract

PURPOSE:To precisely transfer the revolution by providing a spring means, which generates energizing force in the axial direction at an end surface on either side of the captioned coupling, thereby reducing the dimensions in the axial direction and preventing inclination of the coupled parts in the axial direction. CONSTITUTION:A coil spring 16, which generates energized force in the axial direction, is accommodated in a recess 28 located at the middle of an end surface on one side of the captioned coupling, so that an Oldham coupling main body 10 is pressed against a revolving shaft 12 on the opposite side with regard to another revolving shaft 14, which corresponds to the recess 28. A projected, engaging part 22, which is formed on the bottom surface of the Oldham coupling main body 10, is accommodated in the revolving shaft 14 on one side, while a groove 26, which the projected, engaging part 22 can slide with each other, is also formed in the revolving shaft 14 in the longitu dinal direction, or one direction perpendicular to the lengthwise direction of the shaft. In addition, a recess 30, which can accommodate a part of the coil spring 16, is formed in the revolving shaft 14. In the same manner as the conventional revolving shafts, a groove 24, which a projected, engaging part formed on the other end surface of the Oldham coupling main body 10 can slide with each other, is formed on the other revolving shaft 12.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an Oldham joint that connects two shafts.

The Oldham joint according to the present invention includes a servo motor, a detector,
Or it can be used to connect shafts in machine tools and general machines.

[Conventional technology]

Oldham's joint is a part that transmits rotational force between the corresponding shafts on both end faces, and has an engaging part that can slide relative to each shaft, and has an engaging part that can slide relative to each shaft. Generally, there is a gap in the axial direction between the shaft and the corresponding engaging portion.

Due to the existence of the above-mentioned axial clearance, the Oldham joint tends to tilt with respect to the axial direction of the connecting shaft (If the Oldham joint tilts, rotation cannot be accurately transmitted between the two shafts. In places where accuracy is required, such as when using the shaft as a component to connect the rotary shaft to the shaft of a rotation detector, the Oldham joint can be used by making the engagement part between the shaft and the Oldham joint longer in the axial direction. This prevented the joint from tilting.

[Problem to be solved by the invention]

However, due to space issues, it is often difficult to make the engaging portion long in the axial direction as described above.

Therefore, in order to solve these problems, the present invention aims to provide an Oldham joint that is short in the axial direction and is difficult to tilt.

[Means to solve the problem]

In view of the above object, the present invention provides an Oldham joint in which each end face is provided with a corresponding shaft and an engaging portion that can slide against each other in one direction within the plane of each end face. Provided is an Oldham joint characterized in that a spring means for generating a biasing force in the axial direction is provided on the end face of the Oldham joint.

[For production]

The engaging portion on each end face of the Oldham joint and the engaging portion on the corresponding shaft are configured with dimensions that create almost no gap in the lateral direction perpendicular to the mutual sliding direction, but there is no gap in the axial direction. The dimensions allow for plenty of room. Therefore, if the Oldham joint is pressed in the axial direction from one end side by the spring means, the engaging part of the Oldham joint and the engaging part of the corresponding shaft will come into contact with each other in the axial direction, so that the Oldham joint will It is possible to prevent tilting.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. FIG. 1 is an exploded perspective view showing an Oldham joint according to the present invention together with two rotating shafts to be connected.

On each end surface of the Oldham joint body 10, a convex engaging portion 20 or 22 is provided in a direction orthogonal to each other, and a recess is provided in the center of one end surface (lower surface in this figure). 28 are provided. This recess 28 accommodates a coil spring 16 that generates a biasing force in the axial direction, and can press the Oldham joint body 10 against the rotating shaft 12 on the opposite side with respect to the corresponding rotating shaft 14. . In this embodiment, one rotating shaft 14 accommodates a convex engaging portion 22 provided on the lower surface of the Oldham joint body 10, and extends in the longitudinal direction of the convex engaging portion 22, that is, along the shaft. In addition to forming grooves 26 that are slidable relative to each other in one direction perpendicular to the length direction, a recess 30 is also formed in which the coil spring 16 described above can be partially received. The other rotating shaft 12 is formed with a groove 24 that is slidable with respect to the convex engaging portion 20 on the other end surface of the Oldham joint body 10, similarly to the conventional rotating shaft. The depth h2 of the groove 24 is shallower than the height h1 of the convex engaging portion 20 of the Oldham joint body, and therefore, based on the biasing force of the coil spring 16, the Oldham joint body 10 is When pressed in the direction, the convex engaging portion 2
Since the upper surface 20a of the groove 24 is pressed against the bottom surface 24a of the groove 24, the Oldham joint main body is prevented from tilting in the axial direction. That is, the Oldham joint body 10 will not tilt unless a large external force is applied to overcome the biasing force of the coil spring 16.

In the above embodiment, the engaging portion provided on the Oldham joint body 10 is a convex engaging portion, and the rotating shaft 12 to be connected is
, 14 is provided with a concave engaging portion (groove), but conversely, a concave engaging portion is provided toward the Oldham joint body 10, and a convex engaging portion is provided toward the rotating shaft. It is permissible to provide (within the scope of the present invention).

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the engagement portion between the Oldham joint and the rotating shaft to be connected does not have to be set long in the axial direction, that is, the Oldham joint can be shortened in the axial direction. Even if it is, it can be prevented from being tilted with respect to the axial direction. Therefore, it can be used in places where space is limited, and rotation can be transmitted accurately.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an Oldham joint and a rotating shaft according to the present invention. DESCRIPTION OF SYMBOLS 10... Oldham joint body, 12, 14... Rotating shaft, 16... Coil spring, 28... Recess for accommodating coil spring, 30... Recess for accommodating coil spring on rotating shaft side .

Claims (1)

[Claims] 1. In an Oldham joint in which each end face is provided with a corresponding shaft and an engaging part that can slide against each other in one direction within the plane of each end face, on either side of the end face, in the axial direction An Oldham joint characterized by being provided with a spring means for generating a biasing force.