US3704696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve lifter
Assignee: Eaton Corp
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Filing: 1971-03-08
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Granted: 1972-12-05
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Expires: 1991-03-08
Abstract
Abstract A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine includes a body member, a plunger member located at least partially within the body member, and a face member located at least partially within the body member and having a cam engageable surface thereon. A fluid reservoir is located between the face member and the body member and a pressure chamber is disposed between the plunger member and the body member for taking up lash in the valve gear. A leakage passageway is provided between the face member and the body member and provides for the flow of lubricating fluid from the reservoir to the cam engaging surface of the face member to thereby provide for lubrication of the cam engaging surface and the cam. The leakage passageway also provides for air leakage from the lifter to prevent air lockup of the lifter.
Inventors
- 👤 Roy F Abell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:23
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; F01L1/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine comprising a body member, a face member located at least in part within said body member and having a cam engageable outer surface and an inner surface, a plunger member located at least partially within said body member, a fluid chamber defined in part by said body member for receiving lubricating fluid from a source of fluid under pressure, and a leakage passageway defined by said body member and said face member providing for fluid flow from said fluid chamber to said cam engageable outer surface of said face member, said leakage passageway providing for the flow of lubricating fluid to said cam engageable outer surface of said face member to effect lubrication of said cam engageable outer surface and permitting air flow from said fluid chamber to prevent air lockup of said hydraulic valve lifter.
Claim 2
Dependent Claim
155 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine comprising a body member, a face member located at least in part within said body member and having a cam engageable outer surface and an inner surface, a plunger member located at least partially within said body member, a fluid chamber defined in part by said body member for receiving lubricating fluid from a source of fluid under pressure, and a leakage passageway defined by said body member and said face member providing for fluid flow from said fluid chamber to said cam engageable outer surface of said face member, said leakage passageway providing for the flow of lubricating fluid to said cam engageable outer surface of said face member to effect lubrication of said cam engageable outer surface and permitting air flow from said fluid chamber to prevent air lockup of said hydraulic valve lifter.
Claim 3
Dependent Claim
63 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine as defined in claim 1 wherein said face member is slip fitted in an opening in said body member and said leakage passageway is defined by the outer diameter of said face member and the inner diameter of said opening in said body member.
Claim 4
Dependent Claim
47 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine as defined in claim 1 wherein said leakage passageway is defined by an outer peripheral surface of said face member and an inner surface of said body member.
Claim 5
Dependent Claim
49 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine as defined in claim 3 wherein said fluid chamber is a fluid reservoir defined by said inner surface of said face member and an internal surface of said body member.
Claim 6
Dependent Claim
99 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear of an internal combustion engine as defined in claim 4 further including a pressure chamber located between said body member and said plunger member, a fluid passageway disposed in said body member and providing fluid communication between said fluid reservoir and said pressure chamber, valve means for controlling the fluid flow through said fluid passageway from said fluid reservoir to said pressure chamber, and a leak-down passageway defined by said plunger member and said body member for providing for fluid flow from said pressure chamber.
Claim 7
Dependent Claim
170 words
A hydraulic valve lifter for use in a valve gear of an internal combustion engine comprising a body member, a plunger member located at least partially within said body member, a face member slip fitted in said body member, said face member having an outer cam engageable surface, an outer peripheral surface and an inner surface, a fluid reservoir defined by said inner surface of said face member and said body member, a pressure chamber located between said body member and said plunger member, a fluid passageway located within said body member and providing for fluid communication between said fluid reservoir and said pressure chamber, and a leakage passageway defined by said outer peripheral surface of said face member and said body member providing for fluid communication between said reservoir and said outer cam engageable surface of said face member, said leakage passageway providing fluid flow from said reservoir to said outer cam engageable surface of said face member, said fluid flow effecting lubrication of said outer cam engageable surface.
Claim 8
Dependent Claim
170 words
A hydraulic valve lifter for use in a valve gear of an internal combustion engine comprising a body member, a plunger member located at least partially within said body member, a face member slip fitted in said body member, said face member having an outer cam engageable surface, an outer peripheral surface and an inner surface, a fluid reservoir defined by said inner surface of said face member and said body member, a pressure chamber located between said body member and said plunger member, a fluid passageway located within said body member and providing for fluid communication between said fluid reservoir and said pressure chamber, and a leakage passageway defined by said outer peripheral surface of said face member and said body member providing for fluid communication between said reservoir and said outer cam engageable surface of said face member, said leakage passageway providing fluid flow from said reservoir to said outer cam engageable surface of said face member, said fluid flow effecting lubrication of said outer cam engageable surface.
Claim 9
Dependent Claim
43 words
A hydraulic valve lifter as defined in claim 6 further including check valve means disposed in said fluid passageway for controlling the fluid flow from said fluid reservoir to said pressure chamber to thereby control the axial extent of said hydraulic valve lifter.
Claim 10
Dependent Claim
120 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear with an internal combustion engine comprising a body member, a plunger member located at least partially within said body member, a fluid reservoir disposed in said body member for receiving lubricating fluid from a source of fluid under pressure, a face member disposed in an opening in said body member above said fluid reservoir when said hydraulic valve lifter is in a normal operating condition, said face member including a cam engageable surface and an outer peripheral surface, said outer peripheral surface cooperating with said body member opening to provide a leakage passageway providing fluid flow from said fluid reservoir to said cam engageable outer surface.
Claim 11
Dependent Claim
120 words
A hydraulic valve lifter for use in a direct acting overhead camshaft valve gear with an internal combustion engine comprising a body member, a plunger member located at least partially within said body member, a fluid reservoir disposed in said body member for receiving lubricating fluid from a source of fluid under pressure, a face member disposed in an opening in said body member above said fluid reservoir when said hydraulic valve lifter is in a normal operating condition, said face member including a cam engageable surface and an outer peripheral surface, said outer peripheral surface cooperating with said body member opening to provide a leakage passageway providing fluid flow from said fluid reservoir to said cam engageable outer surface.
Claim 12
Dependent Claim
87 words
A hydraulic valve lifter as defined in claim 8 further including a pressure chamber defined between said body member and said plunger member, a fluid passageway disposed in said body member and communicating at one end thereof with said fluid reservoir and the opposite end thereof with said pressure chamber, said fluid passageway providing for fluid flow from said fluid reservoir to said pressure chamber, and check valve means for controlling the fluid flow through said fluid passageway to thereby control the axial extent of said lifter.
Claim 13
Dependent Claim
23 words
A hydraulic valve lifter as defined in claim 8 wherein said face member is slip fitted in said opening in said body member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |