Valve train hydraulic lash adjuster with partial recirculation feature
US9051854B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2014 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Mar 4, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/146
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic lash adjuster for a valve train of an internal combustion engine uses a partial recirculation feature in order to provide device cooling while also retaining many of the benefits associated with leak recirculation. The hydraulic lash adjuster includes a hollow piston that is received in an axial bore of a body component. The annular clearance area between the hollow piston and the body defines a plurality of leak escape paths and a plurality of leak recirculation paths. The portion of the leaked oil recirculated is on a same order of magnitude as the remaining portion of the leaked oil that is allowed to escape back to sump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.