发明名称 |
Wheel drive unit |
摘要 |
A wheel drive unit includes a planetary gear mechanism including a planetary gear and an internally-toothed gear. A casing is integrated with the internally-toothed gear, a wheel is attached to the casing, and the casing transmits rotation of the internally-toothed gear to the wheel. A bearing is fitted to an inner circumferential surface of the casing at a position more toward an interior of a vehicle than the planetary gear and rotatably supports the casing. An inner diameter of an outer race of the bearing is larger than an outer diameter of the planetary gear. |
申请公布号 |
US9046154(B2) |
申请公布日期 |
2015.06.02 |
申请号 |
US201314080450 |
申请日期 |
2013.11.14 |
申请人 |
SUMITOMO HEAVY INDUSTRIES, LTD. |
发明人 |
Ishizuka Masayuki |
分类号 |
F16H1/28;B60K17/04;B60K7/00;F16H57/08 |
主分类号 |
F16H1/28 |
代理机构 |
Buchanan Ingersoll & Rooney PC |
代理人 |
Buchanan Ingersoll & Rooney PC |
主权项 |
1. A wheel drive unit for a vehicle, the wheel drive unit comprising:
a planetary gear mechanism including a sun gear, an internally toothed gear, and two or more planetary gears that mesh with the internally-toothed gear; a casing integrated with the internally-toothed gear, a wheel being attached to the casing, and the casing transmitting rotation of the internally-toothed gear to the wheel; a bearing fitted to an inner circumferential surface of the casing at a position more toward an interior of the vehicle than the planetary gears and rotatably supporting the casing; wherein an inner diameter of an outer race of the bearing is larger than the diameter of a circle having a radius extending from a central axis of the sun gear to a point where the internally-toothed gear meshes with the planetary gears; an oil seal fitted to the inner circumferential surface of the casing at a position more toward the interior of the vehicle than the bearing; wherein an inner diameter of the oil seal is larger than an outer diameter of an inner race of the bearing; a first carrier body located more toward the interior of the vehicle than the planetary gears and configured to support the planetary gears; wherein the first carrier body includes an oil seal seat surface internally meshing with the oil seal, a bearing seat surface to which the inner race of the bearing is fitted and which has a smaller diameter than the oil seal seat surface, and a connecting surface configured to join the oil seal seat surface and the bearing seat surface; and an axial gap is provided between the connecting surface and a lateral surface of the inner race toward the vehicle. |
地址 |
Tokyo JP |