Hydraulic motor device with displacement selector and a braking system
US6926372B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2001 |
| Grant date | Aug 9, 2005 |
| Priority date | — |
| Expiry date | Jan 11, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2063/3033
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Hydraulic motor drive apparatus having a cubic capacity selector (16) which has at least two positions, control means for controlling the selector, which means comprise a hydraulic control chamber (18) suitable for being fed with fluid via a control duct (20), and first opposing return means (17). The apparatus further comprises a brake system having a brake release chamber (38) and second opposing return means (39). The control duct (20) is suitable for being connected to the brake release chamber (38), and the first return means (17) are suitable for returning the cubic capacity selector to its large cubic capacity first position when the pressure in said chamber becomes lower than a first threshold pressure, whereas the second return means (39) return the brake means (36) to their braking position when the pressure in the brake release chamber becomes lower than a second threshold pressure, which is itself lower than said first threshold pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.