Work vehicle having hydraulic stepless speed changing apparatus
US8007403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2008 |
| Grant date | Aug 30, 2011 |
| Priority date | — |
| Expiry date | Feb 27, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H59/54
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A work vehicle includes a hydraulic stepless speed changing apparatus and a gear type speed changing apparatus operable to receive output from the hydraulic stepless speed changing apparatus to convert it into a plurality of stages of speed. A return oil passage connected to a high-pressure side circuit of the hydraulic stepless speed changing apparatus is connected to a hydraulic tank. The return oil passage incorporates an unload valve and a throttle valve, between which an operably coupling mechanism is provided. This operably coupling mechanism switches over the unload valve to an unload condition in response to an operational displacement of a brake operating member for operating a brake to its braking side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.