JPH0545880Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wave gear device with an improved wave generator.

[Conventional technology]

FIG. 1 shows a conventional wave generator. This wave generator 1 consists of a cylindrical member 2 having an elliptical inner surface.
A flexspline 3 is fitted into the elliptical inner surface of this cylindrical member 2, and the flexspline 3 is bent into an elliptical shape. However, this wave generator requires grinding the inner surface of the cylindrical member into an elliptical shape, which is not easy to process.

For this reason, the present applicant disclosed a wave gear device equipped with an improved wave generator in Utility Application No. 139017/1983. A wave generator according to this invention is shown in FIG. This wave generator 10 has a flex spline 11
an annular member 15 surrounding the outer periphery of the annular member 15;
and two supporting members 13 that are supported by screws 16 and protrude inside the annular member 15 to press the outer circumferential surface of the flexspline 11. The support member 13 has an elliptical surface and can be slid along the guide groove 14 in the short axis direction of the ellipse by means of a screw 16 . When this support member 13 is pressed against the outer peripheral surface of the flexspline 11, the flexspline 11
It bends into an oval shape.

[The problem that the idea attempts to solve]

However, although the wave generator shown in FIG. 3 does not need to grind the entire inner surface of the cylindrical member into an elliptical shape like the wave generator shown in FIG. 1, it is necessary to grind the surface of the support member into an elliptical shape. However, processing into an elliptical shape is still necessary. Furthermore, although this wave generator has a structure that directly presses and supports the flexspline, the support is only provided at two locations, so the force for holding the rotating flexspline in an elliptical shape is weak.

Therefore, in view of these points, the present invention is easy to manufacture by eliminating the need for processing into an elliptical shape.
Another object of the present invention is to provide a wave gear device equipped with a wave generator that can reliably maintain the deformation of a flexspline into an elliptical shape.

[Means to solve the problem]

In order to achieve this purpose, the strain wave gearing device of the present invention includes a circular spline, a flex spline on the outside of the circular spline, and a portion on the outside of the flex spline that bends the flex spline in a non-circular manner. In the wave gear device, the wave generator is configured to mesh with each other, and the wave generator is rotatable.
a first annular member made of an elastic material surrounding the outer periphery of the flexspline; a second annular member fitted on the outside of the first annular member; At least two support members protrude to press the outer circumferential surface of the first annular member, and the support members include means for adjusting the length of the support members protruding inward from the second annular member.

〔Example〕

First, a practical example of a wave gear device will be explained with reference to FIG.

The wave generator 1 is used, for example, as a phase adjuster. As shown in FIGS. 1 and 2, a flex spline 3 is attached to a cylindrical member 2 having an elliptical inner surface.
At the same time, the pair of circular splines 4a and 4b are engaged with the flexspline 3, and the flexspline 3 is fixed to the cylindrical member 2 with the bolt 5. As a result, the flexspline 3 meshes with the circular splines 4a and 4b while being bent into an elliptical shape. The circular spline 4a is set to have the same number of teeth as the flex spline, and the circular spline 4b is set to have a smaller number of teeth than the flex spline. Here, when the wave generator 1 is rotated with respect to the circular spline 4a, the circular spline 4a and the flexspline 3 have the same number of teeth, so no relative movement in the rotational direction occurs, but the circular spline 4b Since there is a difference in the number of teeth between the wave generator and the flex spline 3, the circular spline 4b rotates by a small angle in the same rotation direction as the rotation angle of the wave generator. In this way, the phase in the rotational direction between the circular splines 4a and 4b can be adjusted, and the phase of the cam, gear, etc. can be finely adjusted.

FIG. 4 shows an example of a wave gear device equipped with a wave generator according to the present invention. The wave gear device of the present invention includes an annular member 21, an elastic annular member 22 that fits inside the annular member 21 and is made of an elastic member, and an elastic annular member that extends through the annular member 21 and protrudes inside the annular member 21. A wave generator consisting of a pair of screws 23 arranged in the diametrical direction of the annular member 21 that presses the outer circumferential surface of the member 22 and an elastic annular member 2
2, and a circular spline 25 that meshes with the flexspline 24.

The wave gear device of the present invention having this configuration operates as follows.

Inside the annular member 21, an elastic annular member 22, a flex spline 24, and a circular spline 25 are arranged.
Fit in this order. Next, a pair of screws 23 are screwed into the annular member 21 from both directions so that they protrude from the inner surface of the annular member 21 by the same distance. Since the elastic annular member 22 is made of an elastic material, when it is pressed by the screw 23, it deforms into an elliptical shape whose minor axis is in the direction in which the screw 23 is located. Once the desired oval shape is obtained, the screw 23 is fixed in place with a double nut, adhesive, or the like.
When the elastic annular member 22 is deformed into an elliptical shape, the flex spline 24 fitted inside the elastic annular member 22 is also deformed into an elliptical shape and meshes with the circular spline 25. In this state, when the wave generator is rotated with respect to one circular spline, the other circular spline rotates by a small angle in the same rotation direction with respect to the rotation angle of the wave generator, and the distance between the two circular splines is The phase of can be adjusted. In addition,
In order to prevent the elastic annular member 22 from slipping against the annular member 21, two positions 26 are provided where both members touch.
In this case, both members may be fixed with an adhesive or the like. It is also possible to deform the elastic annular member 22 into an elliptical shape by fixing one of the pair of screws 23 and moving only the other.

[Effect of idea]

In the wave generator of the wave gear device according to the present invention, the flexspline is deformed into a non-circular shape without using any non-circular member, and there is no need to process the member into a non-circular shape.

Further, since the entire outer circumference of the flexspline is held by the elastic annular member, the force for keeping the flexspline in a non-circular shape is strong, and the engagement between the flexspline and the circular spline is also efficient.

[Brief explanation of the drawing]

FIG. 1 is an exploded view of a conventional strain wave gear device, FIG. 2 is a sectional view of the assembled strain wave gear device of FIG. 1, and FIG. 3 is a front view of another conventional strain wave gear device.
FIG. 4 is a front view of the wave gear device according to the present invention. Explanation of symbols, 1, 10... Conventional wave generator,
2... Cylindrical member, 3, 11... Flex spline, 4a, 4b, 12... Circular spline, 5... Bolt, 13... Support member, 14...
Guide groove, 15... Annular member, 16... Screw, 21
...Annular member, 22...Elastic annular member, 23...
Screw, 24...flex spline, 25...circular spline.

Claims (1)

[Scope of utility model registration request] This wave generator consists of a circular spline, a flex spline outside the flex spline, and a wave generator located outside the flex spline that bends the flex spline non-circularly and partially engages the circular spline. In the wave gear device which is rotatable, the wave generator includes a first annular member made of an elastic material surrounding the outer periphery of the flexspline, and a second annular member fitted on the outside of the first annular member. and supported by the second annular member,
at least two support members that protrude inside the second annular member and press the outer peripheral surface of the first annular member, and the support members are provided with means that can adjust the length of the support members that protrude inside the second annular member. A wave gear device characterized by: