US 11,746,881 B2
Reduction gear
Masayuki Ishizuka, Kanagawa (JP); and Mitsuhiro Tamura, Kanagawa (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on May 23, 2022, as Appl. No. 17/751,229.
Application 17/751,229 is a division of application No. 16/691,151, filed on Nov. 21, 2019, abandoned.
Claims priority of application No. 2018-235146 (JP), filed on Dec. 17, 2018.
Prior Publication US 2022/0282780 A1, Sep. 8, 2022
Int. Cl. F16H 57/038 (2012.01)
CPC F16H 57/038 (2013.01) 18 Claims
OG exemplary drawing
 
1. A reduction gear comprising:
a reduction mechanism; and
a component which constitutes the reduction gear and in which a cavity portion is provided,
wherein the reduction mechanism is not provided in the cavity portion,
wherein the component comprises a reinforcement structure which is provided to partially fill an inside of the cavity portion and forms a void, which is filled with air or fluid, in the cavity portion,
wherein the cavity portion is provided so as to form a closed space inside the component, and
wherein the cavity portion is provided such that an inner wall surface of the cavity portion and reinforcing materials constituting the reinforcement structure are integrally formed.