Piston-slide-valve
US5329841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Mar 12, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8671
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A piston-slide valve including a housing in which a piston with at least one oil groove and control edge is guided shiftable or slidable in a bore characterized thereby that the oil groove of the piston is manufactured via wire erosion. Also the control edges of the piston are manufactured by wire erosion. The bore of the sleeve bushing is manufactured by wire erosion. The piston is made out of a needle roller. The piston has a length of approximately 13 mm and a diameter of approximately 2 mm. The wire for eroding of the piston as well as the sleeve bushing has a diameter of approximately 2/10 mm. Longitudinal sides of a multiple edged groove base or bottom of the oil groove of the piston and control edges therewith are formed in a first working step procedure and the remaining longitudinal edges of the oil groove and the remaining control edges are formed in a further working step. The piston occupies one position and another working position displaced by 900.degree. from each other. Several needle rollers arranged in a multiple compartment holding device are produced via wire erosion in common with each other. During the machining or working of the bore of the bushing sleeve, th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.