Hydraulic lash adjuster
US6192845A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/24
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic lash adjuster (1) having a plunger assembly (3) including an upper plunger (4) and a lower plunger (5), the plungers being disposed within a body (2) defining a bore (2b,7), and in conventional leakdown plungers, cooperating with the bore to define a nominal diametral clearance. In accordance with one aspect of the invention, the plungers and the bore are provided with a reduced diametral clearance, substantially less than the nominal clearance, thus substantially improving the consistency of leakdown times. In accordance with another aspect of the invention, the upper plunger element (4) includes a center land (25) which defines a fluid passage (33), such as by having a flat (31) ground into the land, to insure the proper amount of lubrication fluid flowing out of the ball plunger (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.