JP2518934Y2 - Wave gear device with lubrication mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a wave gear device having a lubrication mechanism.

[Conventional technology]

If there is almost no clearance between the flexspline and the outer peripheral surface of the wave generator, if the lubricant continues to operate without sufficient supply, fine contact wear (fretting corrosion) easily occurs at the contact area between the two surfaces. . In order to prevent this slight wear, a groove may be provided on the inner surface of the flexspline or the outer peripheral surface of the bearing to store the lubricant, but if a groove is provided, slippage tends to occur between the two surfaces and sliding wear will occur. Cause of. Further, when the surface is perforated to form the groove, the thickness of the member becomes thin, and the strength of the flexspline or the bearing is lowered.

[Problems to be solved by the device]

In view of this point, an object of the present invention is to provide a wave gear device provided with a lubricating mechanism capable of preventing fine motion wear without causing slippage between the inner surface of the flexspline and the outer peripheral surface of the bearing.

[Means for solving the problem]

In order to achieve this object, the wave gear device according to the present invention is provided with a circular spline, a flexspline inside the circular spline, and a wave spline that flexes the flexspline in a non-circular shape and partially meshes with the circular spline. A generator, the wave generator comprising:
In a wave gear device including a non-circular member and a bearing fitted between the member and the flexspline, a concave portion or a convex portion is provided on at least one of the inner surface of the flexspline and the outer peripheral surface of the bearing. Is provided, and the feature is that the lubricant can be held between both surfaces by this mechanism.

〔Example〕

FIG. 1 shows an arc-shaped recess 2 provided on the inner surface 1 of the flexspline. The recesses 2 are irregularly provided on the entire flexspline inner surface 1, and the recesses may have any shape other than an arc shape. A similar recess may be provided on the outer peripheral surface of the bearing. If grease or other lubricant is applied to the inner surface of the flexspline and the outer peripheral surface of the bearing at the beginning of assembly, this grease is stored in the concave portion and supplied between the flexspline and the outer peripheral surface of the bearing during operation of the device.

FIG. 2 shows a rectangular convex portion 3 provided on the inner surface 1 of the flexspline. The convex portions 3 are also irregularly provided on the entire inner surface 1 of the flexspline, and the shape of the convex portions is not limited to a square shape, and may be an arc shape or another shape. A similar convex portion may be provided on the outer peripheral surface of the bearing. By providing this convex portion, a clear lath can be secured between the flex spline and the outer peripheral surface of the bearing, the grease is retained in the clearance, and lubrication is performed during operation of the device.

FIG. 3 shows the uneven portion 4 provided on the inner surface 1 of the flexspline. The concavo-convex portion 4 is irregularly provided on the entire flexspline inner surface 1, and the shape of the concave portion and the convex portion is arbitrary. Similar uneven portions may be provided on the outer peripheral surface of the bearing. The mechanism shown in FIG. 3 is a combination of the mechanisms shown in the previous two figures, and stores grease in the concave portion and holds the grease in the clearance between both surfaces formed by providing the convex portion. is there.

[Effect of device]

By providing the concave portion or the convex portion as described above, the lubricant can be constantly supplied between the inner surface of the flexspline and the outer peripheral surface of the bearing, and sufficient lubrication can be performed during the operation of the apparatus. This makes it possible to prevent fine movement wear. Further, the concave portions or the convex portions are irregularly provided on the entire surface, but since they are not continuous like the groove, there is no such phenomenon as slippage that occurs when the groove is provided.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of the inner surface of a flexspline provided with a recess, FIG. 1 (b) is a sectional view of the recess, and FIG. 2 (a) is a perspective view of the inner surface of a flexspline provided with a projection. FIG. 3B is a sectional view of the convex portion, FIG. 3A is a perspective view of the inner surface of the flexspline provided with the concave and convex portion, and FIG. 3B is a sectional view of the concave and convex portion. [Explanation of reference symbols] 1 ... flex spline inner surface, 2 ... recessed portion 3 ... convex portion, 4 ... uneven portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References: 60-129546 (JP, U): 58-151545 (JP, U): 60-65451 (JP, U): 61- 206154 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A circular spline, a flexspline inside the circular spline, and a wave generator that flexes the plexspline in a non-circular shape and partially meshes with the circular spline, the wave generator comprising: In a wave gear device including a non-circular member and a bearing fitted between the member and the flexspline, at least one of the inner surface of the flexspline and the outer peripheral surface of the bearing is provided. A wave gear device provided with a lubricating mechanism, characterized in that a plurality of concave portions or convex portions, or both of them are provided in a discontinuous, discrete and irregularly distributed state.