Adjustable hydrostatic pump with additional pressure change control unit
US5980215A · kind A · utility
7Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jul 8, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/128
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An adjustable hydrostatic pump (10), in particular a piston pump, is proposed, whose cam ring (22) is adjustable via a hydromechanical adjusting assembly (35) and which has a device for active noise abatement. A pressure chamber (39) of a adjusting piston (37) acting upon the cam ring (22) is acted upon by pressure changes, via an additional control unit (47) parallel to the hydromechanical pressure controller (41), in such a way that the oscillating actions of power-train forces on the hydraulic fastening of the cam ring (22) are reduced, thus lessening the noise produced by the piston pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.