Hydrostatic transmission with hydraulic bypass and air bleed
US5010733A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Mar 24, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/4043
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydrostatic transmission having a housing with a sump and a pair of hydraulic displacement units interconnected by first and second fluid passages. A pair of bypass valves can be opened to place said first and second fluid passages in fluid communication. A recess, formed in the lower part of the housing, holds make-up oil and communicates with said first and second fluid passages when the bypass valves are opened. A passage extends upwardly from the housing recess and has its upper end normally sealed by seal means. A manually operable bypass rod extends lengthwise of the passage into the area of the housing recess and has structure associated therewith for causing opening of the bypass valves. The seal means is in the form of a washer fastened to the bypass rod whereby upward movement of the bypass rod to open the bypass valves moves the washer away from the upper end of the passage whereby air bubbles that have collected in the upper part of the passage during a bypass operation can rise out of the passage and escape into the upper part of the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.