Eccentric oscillating type speed reducer and method for manufacturing internal gear

A deceleration device and eccentric swinging technology, which is applied to the transmission device, gear transmission device, gear, etc., can solve the problems of difficult high-precision molding and the decrease of uniformity of internal gears, etc.
CN110107655BActive Publication Date: 2022-06-28SUMITOMO HEAVY IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUMITOMO HEAVY IND LTD
Publication Date
2022-06-28

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Abstract

The present invention provides an eccentric oscillating type speed reducer capable of increasing the types of resin materials constituting the internal gear and a method of manufacturing the internal gear. In the manufacturing method of the internal gear in the eccentric oscillating type reduction gear according to the present invention, the eccentric oscillating type reduction gear includes the internal gear, the first external gear and the second external gear internally meshed with the internal gear, and the first external gear And the eccentric body that oscillates with the second external gear. The internal gear is made of resin, and has: a first internal tooth set meshing with the first external gear; a second internal tooth set meshing with the second external gear; and an intermediate portion provided between the first internal tooth set and the second external gear No teeth are formed between the 2 inner tooth groups. The resin is injected from the radially inner side (Cin) of the internal gear than the position where the internal teeth are formed, and the resin is moved radially outward from a portion (CP2) corresponding to the gap between the first external gear and the second external gear, Thus forming the internal gear.
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Description

[0001] This application claims priority based on Japanese Patent Application No. 2018-016085 filed on February 1, 2018. The entire contents of the Japanese application are incorporated herein by reference. technical field

[0002] The invention relates to an eccentric swing type reduction gear and a manufacturing method of an internal gear. Background technique

[0003] Conventionally, there is an eccentric swing type reduction gear transmission including an internal gear, an external gear that meshes with the internal gear, and an eccentric body that oscillates the external gear. Patent Document 1 discloses that gears such as an internal gear and an external gear in an eccentric swing type reduction gear are made of resin.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 7-243486

[0005] When the annular internal gear is injection-molded using a resin material, if no measures are taken, there is a problem in that it is difficult to mold with high pre...

Claims

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