US 12,466,467 B2
Gear housing and electric assist device
Hansol Kim, Maebashi (JP); Yoshifumi Kurokawa, Maebashi (JP); and Kittipon Roongvashira, Maebashi (JP)
Assigned to NSK STEERING & CONTROL, INC., Tokyo (JP)
Appl. No. 18/703,087
Filed by NSK STEERING & CONTROL, INC., Tokyo (JP)
PCT Filed Oct. 6, 2022, PCT No. PCT/JP2022/037387
§ 371(c)(1), (2) Date Apr. 19, 2024,
PCT Pub. No. WO2023/074304, PCT Pub. Date May 4, 2023.
Claims priority of application No. 2021-173749 (JP), filed on Oct. 25, 2021.
Prior Publication US 2024/0416989 A1, Dec. 19, 2024
Int. Cl. B62D 5/04 (2006.01); F16H 57/03 (2012.01); F16H 57/039 (2012.01)
CPC B62D 5/0403 (2013.01) [B62D 5/0454 (2013.01); F16H 57/03 (2013.01); F16H 57/039 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A gear housing including
a wheel housing section that accommodates a worm wheel inside, and a worm housing section that accommodates a worm inside,
the wheel housing section having a tubular portion for wheel arranged around the worm wheel, a circular bottom portion for wheel extending from an end portion of the tubular portion for wheel on one side in an axial direction of the wheel housing section toward an inner side in a radial direction, and a fitting tubular portion for wheel connected to an end portion on the inner side in the radial direction of the bottom portion for wheel and into which a bearing for wheel for supporting the worm wheel is internally fitted,
the worm housing section having a tubular shape with at least an end portion on one side in an axial direction of the worm housing section is open, having a center axis arranged at a skewed position with respect to a center axis of the wheel housing section, and connected to a portion in a circumferential direction of an end portion on an outer side in the radial direction of the wheel housing section, and,
the worm housing section having fitting tubular portions for worm into which a bearing for worm for supporting the worm or a bearing holder holding the bearing for worm is internally fitted respectively at two locations separated in the axial direction of the worm housing section, wherein
the gear housing includes:
a one side rib that protrudes from a side surface of the bottom portion for wheel on the one side in the axial direction of the wheel housing section and connects the fitting tubular portion for wheel and a fitting tubular portion for worm on the one side in the axial direction of the worm housing section of the fitting tubular portions for worm at two locations, and
an other side rib that protrudes from a side surface of the bottom portion for wheel on the one side in the axial direction of the wheel housing section and connects the fitting tubular portion for wheel and a fitting tubular portion for worm on the other side in the axial direction of the worm housing section of the fitting tubular portion for worm at the two locations.