Method of making a valve lifter
US7308760B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2006 |
| Grant date | Dec 18, 2007 |
| Priority date | — |
| Expiry date | Mar 14, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4998
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve lifter and a method of manufacture thereof is provided in which sliding properties of a cam on a cam-contacting sliding surface in an upper surface of a valve lifter are improved by forming the cam-contacting sliding surface as a concave surface to permit retention of lubricating oil therein. The cam-contacting sliding surface is integrally provided in an outer wall of an upper part of a valve lifter. The cam-contacting sliding surface is formed as a concave surface to provide better retention of the lubricating oil. The concave sliding surface is formed during high temperature oxidation of the valve lifter by permitting the natural slumping down of the upper part due to its own weight under the gravity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.