US 12,247,653 B2
Transmission gear box
Yuan Jiang, Guangdong (CN); Huoming Li, Guangdong (CN); and Xianghuai Qiu, Guangdong (CN)
Assigned to GUANGDONG ZHAOQING L&V CO. LTD., Guangdong (CN)
Appl. No. 17/905,044
Filed by GUANGDONG ZHAOQING L&V CO. LTD., Guangdong (CN)
PCT Filed Feb. 20, 2021, PCT No. PCT/CN2021/077030
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/169865, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 202010119253.6 (CN), filed on Feb. 26, 2020.
Prior Publication US 2023/0133002 A1, May 4, 2023
Int. Cl. F16H 57/02 (2012.01); B23K 26/20 (2014.01); B23K 33/00 (2006.01); B23K 37/06 (2006.01); F16H 57/031 (2012.01); B23K 26/28 (2014.01)
CPC F16H 57/031 (2013.01) [B23K 33/006 (2013.01); B23K 26/28 (2013.01); B23K 37/06 (2013.01); F16H 2057/02008 (2013.01); F16H 2057/02017 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A transmission gear box comprising:
a cylindrical box body, the box body having an axis therethrough and defining a cavity for gears;
an end cover fixed on at least one axially opened end of the cavity of the box body; and
a fitting structure extending at least in an axial direction of the box body and the end cover, the fitting structure including an inner fitting surface located on a surface of one of the box body and the end cover, and an outer fitting surface located on a surface of the other one of the box body and the end cover,
wherein a clearance fit area having interference fit areas located on both sides thereof is arranged between the inner fitting surface and the outer fitting surface, the inner fitting surface including a stepped inner rib having three steps extending circumferentially and the outer fitting surface including a stepped outer rib having two steps extending circumferentially such that one interference fit area of the interference fit areas is at a different radial distance than the other interference fit area of the interference fit areas and a molten body produced by melting of an interference fit area occupies a portion of the clearance fit area.