Lash adjustment means for valve gear of an internal combustion engine
AssigneeEaton Corporation
InventorJohn J. Krieg
Life of this patent
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Abstract
A hydraulic lash adjuster for valve gear of an internal combustion engine, the lash adjuster being of the type which operates from oil received under pressure from a gallery provided in the engine lubricant supply system. The body of the adjuster has a movable plunger with a one-way check valve for admitting and retaining oil in a chamber between the adjuster body and the plunger. A portion of the plunger includes a pivot surface for pivotally engaging associated components of the valve gear with a reservoir formed in the plunger which communicates with a one-way valve for admitting oil to the chamber. An inlet metering means including an annular metering land provides exclusive lubricant communication to the reservoir from an oil entry port in the body.
Claims24
Hydraulic lash adjusting means for valve gear of an internal combustion engine comprising:
- (a) a body having a blind bore formed therein;
- (b) plunger means slidably received in said body bore and defining, in cooperation with the blind end of said bore, a cavity, said plunger means including,
- (i) means defining a pivot surface adapted to contact associated engine valve gear components,
- (ii) means defining a fluid reservoir, and
- (iii) one-way valve means permitting fluid flow from said reservoir to said cavity;
- (c) said body including inlet port means communicating with said bore and adapted for receiving fluid under pressure therein;
- (d) means defining a fluid passage communicating with said port means and exclusively providing fluid communication therefrom with said reservoir, said passage defining means including primary fluid metering means continuously metering all fluid to said reservoir, said primary metering means including a first annular collector groove and a first annular metering land fluidically downstream of said collector groove;
- (e) pressure relief means communicating with said fluid passage, said pressure relief means including secondary metering means including a second annular collector groove and a second annular metering land downstream of said second collector groove for metering fluid flow from said passage to the atmosphere wherein said first metering land is intermediate said first and second collector groove;
- and,
- (f) means biasing said plunger means outwardly of said cavity.
Hydraulic lash adjusting means for valve gear of an internal combustion engine comprising:
- (a) a body having a blind bore formed therein;
- (b) plunger means slidably received in said body bore and defining, in cooperation with the blind end of said bore, a cavity, said plunger means including,
- (i) means defining a surface adapted to contact associated engine valve gear components,
- (ii) means defining a fluid reservoir, and
- (iii) one-way valve means permitting fluid flow from said reservoir to said cavity;
- (c) said body including inlet port means communicating with said bore and adapted for receiving fluid under pressure therein;
- (d) means defining a fluid passage communicating with said port means and exclusively providing fluid communication therefrom with said reservoir, said passage defining means including primary fluid metering means continuously metering all fluid to said reservoir, said primary metering means including a first annular collector groove and a first annular metering land fluidically downstream of said collector groove;
- (e) pressure relief means communicating with said fluid passage, said pressure relief means including secondary metering means including a second annular collector groove and a second annular metering land downstream of said second collector groove for metering fluid flow from said passage to the atmosphere wherein said first metering land is intermediate said first and second collector groove;
- and,
- (f) means biasing said plunger means outwardly of said cavity.
Dependencies are inferred from the claim text.