Closed cavity piston for hydrostatic units
US6314864A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Jul 20, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/124
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A closed cavity piston assembly includes a piston body, a separately formed piston cap sealingly joined to the body, and an elongated stem integrally formed with one of the piston body or the cap. In one embodiment, the stem is integrally formed with the piston body. In another embodiment, the stem is integrally formed with the piston cap and slidably journaled in and sealed to a hole in the bottom of the piston body. The cap of the piston assembly also has a surface for engaging a slipper. In either case, a fluid passageway extends through the stem, body, and cap of the piston assembly. The passageway is remote from the side wall of the piston body and fluidly isolated from the main interior cavity of the hollow piston body once the cap and body are sealingly joined together. The piston assembly can be pivotally attached to a slipper that has its own fluid passageway, which registers with the passageway in the cap, to provide fluid for slipper lubrication and balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.