Gear transmission device

Abstract

First outer teeth (14a) each have a first machined section (142) at one of the ends thereof, and the tooth surface of the first machined section (142) is machined so that the tooth surface extends inward in the radial direction as the tooth surface extends toward an end thereof in the axial direction. Second teeth (16a) each have a machined section (162) at one of the ends thereof, and the tooth surface of the second machined section (162) is machined so that the tooth surface extends inward in the radial direction as the tooth surface extends toward an end thereof in the axial direction. Inner tooth pins (3) are each provided with: a first reduced diameter section (31) provided at the portion of the inner tooth pin (3) which corresponds in the radial direction to an end of each of the first outer teeth (14a), the end being on the side on which the first machined section (142) is not provided; and a second reduced diameter section (32) provided at the portion of the inner tooth pin (3) which corresponds in the radial direction to an end of each of the second outer teeth (16a), the end being on the side on which the second machined section (162) is not provided.

Description

technical field [0001] The invention relates to a gear transmission device. Background technique [0002] Conventionally, there is known an eccentric oscillating type gear transmission in which an external gear meshed with an internal pin of the internal gear is oscillatingly rotated in conjunction with the eccentric rotation of the eccentric portion of the crankshaft, thereby achieving deceleration relative to the input rotational speed. The output rotation (for example, refer to Patent Document 1). [0003] In the gear transmission described in Patent Document 1, a plurality of internally toothed pins that mesh with two externally toothed gears are provided. Each internal tooth pin has a first engaging portion, a second engaging portion, and a connecting portion connecting the two engaging portions. Both ends in the axial direction of each engaging portion are subjected to drum finishing (Patent Document 1 image 3 ,Image 6). Accordingly, the edge stress generated betwe...

AI Technical Summary

Problems solved by technology

[0004] However, in Patent Document 1 image 3 And in the gear transmission shown in Figure 6, it is necessary to carry out drum-shaped finishing processing on both ends of the first meshing part in each internal gear pin, and carry out drum-shaped finishing processing on both ends of the second meshing part, and pass The connecting part connects these two meshing parts, so there is a problem that the cost increases

Furthermore, as shown in FIG. 7 of Patent Document 1, in the case where both ends of each externally toothed gear are crowned, the man-hours required for the crowning process increase and the cost increases.

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