Transaxle unit with integrated power take-off unit and torque coupling device
US7857723B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 2005 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Oct 28, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K23/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A transaxle unit comprises a differential assembly having a differential mechanism, a power take-off unit and a torque-coupling device for selectively restricting differential rotation of a differential mechanism. The torque-coupling device includes a friction clutch assembly for selectively frictionally engaging and disengaging a differential case and one of output axle shafts and a hydraulic clutch actuator. The hydraulic clutch actuator includes a hydraulic pump and a variable pressure relief valve assembly fluidly communicating with the hydraulic pump to selectively control a hydraulic pressure generated by the hydraulic pump. The variable pressure relief valve assembly comprises a valve closure member, a valve seat complementary to the valve closure member and an electro-magnetic actuator for engaging the valve closure member and generating a variable electro-magnetic force urging selectively vary a release pressure of the pressure relief valve assembly based on a magnitude of an electric current supplied to the electro-magnetic actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.