US 12,460,701 B2
Speed reducer, joint module and robotic arm
Huizhong Yang, Hangzhou (CN); Yilin Yang, Hangzhou (CN); Zhaobo Qing, Hangzhou (CN); and Qiong Liu, Hangzhou (CN)
Assigned to T-MAX (HANGZHOU) TECHNOLOGY, CO., LTD., Zhejiang (CN)
Filed by T-MAX (HANGZHOU) TECHNOLOGY CO., LTD., Hangzhou (CN)
Filed on Dec. 10, 2024, as Appl. No. 18/976,170.
Claims priority of application No. 202410066636.X (CN), filed on Jan. 16, 2024.
Prior Publication US 2025/0230855 A1, Jul. 17, 2025
Int. Cl. F16H 1/32 (2006.01); F16D 59/00 (2006.01); F16D 121/16 (2012.01)
CPC F16H 1/32 (2013.01) [F16D 59/00 (2013.01); F16D 2121/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A speed reducer, comprising:
an inner gear having an inner gear hole;
an outer gear having an outer gear hole, and at least partially arranged in the inner gear hole and interfaced with the inner gear;
an eccentric wheel rotatably supported in the outer gear hole, wherein the eccentric wheel has a rotation axis that is coaxial with a central axis of the inner gear, and wherein the outer gear is configured to be driven by the eccentric wheel to revolve around the rotation axis of the eccentric wheel while rotating around its own axis;
a brake block arranged on the eccentric wheel to rotate together with the eccentric wheel, the brake block being movable relative to the eccentric wheel between a braking position where the brake block abuts against the outer gear and a release position where the brake block is separated from the outer gear;
an elastic member coupled to the eccentric wheel and the brake block, wherein the elastic member is configured to press the brake block towards the braking position; and
a drive member coupled to the eccentric wheel, wherein the drive member has a rotation axis that is coaxial with the rotation axis of the eccentric wheel, wherein, when the drive member rotates, the brake block moves to the release position relative to the eccentric wheel so that the drive member drives the eccentric wheel and the brake block to rotate together, and when the drive member stops rotating, the elastic member pushes the brake block to the braking position to prevent the eccentric wheel and the brake block from rotating together.