Eccentrically swinging reducer

Abstract

The invention provides an eccentrically swinging reducer, which cannot complicate the shape of an outer gear, has a low costs, and can be supply the lubricant for various parts in the reducer smoothly. The eccentrically swinging reducer (G1) is provided with a first outer gear and a second outer gear(22,24) capable of swinging; an inner gear (26) in an inner engagement with the first and the second outer gears; a first wheel rack body and a second wheel rack body (32,34), which are disposed on axial sides of the first and the second outer gears. Inner pin holes (22A,24A), which are through holes in the axial direction, are disposed in eccentric positions of a center O2 and O3 of the first and the second outer gears. The first and the second wheel rack bodies are disposed on a first angular contact ball bearing and a second angular contact ball bearing, namely main bearings(36,38)of a housing (31), and a gap delta 2 in the axial direction is arranged between the second angular contact ball bearing and the second outer gear. A protruding part (34F), which abuts against the second outer gear in the axial direction, is disposed in the second wheel rack body closer to the inner side in the radial direction than the inner pin hole (24A).

Description

Technical field [0001] The invention relates to an eccentric swing type speed reducer. Background technique [0002] Patent Document 1 discloses an eccentric swing type speed reducer including an external gear that swings by an eccentric body and an internal gear internally meshed with the external gear. [0003] In this eccentric swing type speed reducer, a pair of carrier bodies are provided on both axial sides of the external gear, and the relative rotation of the external gear and the internal gear (rotation component of the external gear) is output through the pair of carrier bodies. The pair of wheel carrier bodies are rotatably supported by the housing via a pair of main bearings, respectively. [0004] In this eccentric swing type speed reducer, two external gears are arranged side by side, and one of the external gears is restricted from moving in the axial direction by the outer ring of the main bearing on one side of the pair of main bearings. In addition, the axial posi...

AI Technical Summary

Problems solved by technology

However, in the eccentric oscillating speed reducer in which the movement of the external gear in the axial direction is restricted according to the above structure, there is a problem that even if the lubricant is supplied from the outside of the casing (the radially outside of the external gear), the movement of the external gear is restricted. The movement of the gear is limited, and the existence of the main bearing or the convex part that contacts the external gear significantly hinders the radial movement of the lubricant, and it is difficult for the lubricant to reach the radially inner bearing part

[0008] However, since the disclosed example of the above-mentioned Patent Document 1 is an example studied in order to make the lubricant flow to the external gear, there is a problem that the shape of the external gear, which is inherently difficult to manufacture, becomes more complicated and increases the cost.

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