US3875910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for adjusting and holding the valve play in internal combustion engines
Assignee: Daimler Benz AG
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Filing: 1973-12-03
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Granted: 1975-04-08
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Expires: 1993-12-03
Abstract
Abstract A device for adjusting and retaining the valve play in internal combustion engines, especially in motor vehicle internal combustion engines in which a transmission member such as a rocker arm controlled by a cam cooperates with the valve stem by way of an adjusting member, for example, in such a manner that the rocking lever arm abuts with one end on the valve stem and with the other end on an abutment operating as adjusting member which is constructed in the manner of a piston sliding within an oil-filled cylinder and equipped with a check valve; the abutment thereby is formed by a first piston which dips into the housing and which receives with its inner end a second piston that is located in the connection between the pressure space and the reservoir space; the second piston accommodates a check valve closing off this connection; the second piston is also adapted to be fixed with respect to the first piston by a clamping device which is axially movable with respect to the first piston by the predetermined valve play.
Inventors
- 👤 Anton Zink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:11
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/2405
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
153 words
A valve play adjusting and maintaining device, in which a transmission means controlled by a cam cooperates by way of an adjusting means with a valve stem in such a manner that the transmission means rests with its one end on an abutment operable as adjusting means, characterized by a first piston means forming said abutment, a housing receiving said first piston means, said first piston means receiving at its inner end which immerses into said housing, a second piston means, said second piston means being disposed in the connection between a pressure space means and a reservoir space means operatively connected with each other, a second piston means accommodating a check valve means operable to close off said connection, said second piston means being fixable with respect to said first piston means by a clamping means which is axially movable with respect to the first piston means by a predetermined valve play.
Claim 2
Dependent Claim
153 words
A valve play adjusting and maintaining device, in which a transmission means controlled by a cam cooperates by way of an adjusting means with a valve stem in such a manner that the transmission means rests with its one end on an abutment operable as adjusting means, characterized by a first piston means forming said abutment, a housing receiving said first piston means, said first piston means receiving at its inner end which immerses into said housing, a second piston means, said second piston means being disposed in the connection between a pressure space means and a reservoir space means operatively connected with each other, a second piston means accommodating a check valve means operable to close off said connection, said second piston means being fixable with respect to said first piston means by a clamping means which is axially movable with respect to the first piston means by a predetermined valve play.
Claim 3
Dependent Claim
19 words
A device according to claim 1, characterized in that the oil filling is maintained by supply from the outside.
Claim 4
Dependent Claim
17 words
A device according to claim 1, characterized in that the transmission means is a valve rocker member.
Claim 5
Dependent Claim
66 words
A device according to claim 1, characterized in that the clamping means consists of a slotted clamping ring having conical end surfaces and disposed on the second piston means and of one sleeve means on each side of the clamping ring, said sleeve means being arranged in the first piston means and having conical end surfaces cooperating with the conical end surfaces of the clamping ring.
Claim 6
Dependent Claim
46 words
A device according to claim 4, characterized in that the second piston means includes at its inner end facing the pressure space means, a valve disk, the sleeve means arranged underneath the clamping ring forming with a cone surface thereof the seat for the valve disk.
Claim 7
Dependent Claim
43 words
A device according to claim 5, characterized in that the first piston means includes at its inner end facing the pressure space means an abutment ring and in that the clamping means has the predetermined axial play with respect to said abutment ring.
Claim 8
Dependent Claim
53 words
A device according to claim 6, characterized in that the sleeve means arranged below the clamping ring includes at its end facing the pressure space means, a double conical surface, whose radially inner cone surface serves as valve seat and whose radially outer cone surface serves as counter surface for the abutment ring.
Claim 9
Dependent Claim
53 words
A device according to claim 7, characterized in that the second piston means is provided with a central bore open only toward the inside of the first piston means, said central bore being in communication directly above the valve disk by way of radial openings with the surrounding space underneath the clamping means.
Claim 10
Dependent Claim
35 words
A device according to claim 8, characterized in that the reservoir space means is operatively connected by way of lateral bore with a groove means surrounding the first piston means and serving as oil-collecting means.
Claim 11
Dependent Claim
73 words
A device according to claim 9, which includes a ball head provided with an oil bore, arranged on the first piston means and serving as abutment for said transmission means, characterized in that said oil bore is closed off by a suction valve means arranged in the reservoir space means and in that said suction valve means is supported by means of a spring on a spring plate at the second piston means.
Claim 12
Dependent Claim
22 words
A device according to claim 10, characterized in that a compression spring is arranged between the clamping ring and the spring plate.
Claim 13
Dependent Claim
33 words
A device according to claim 11, characterized in that a rod projecting up to into the second piston means is secured at the suction valve means for pushing open the check valve means.
Claim 14
Dependent Claim
23 words
A device according to claim 12, characterized in that a small notch is provided in the sealing surface of the suction valve means.
Claim 15
Dependent Claim
17 words
A device according to claim 13, characterized in that the transmission means is a valve rocker member.
Claim 16
Dependent Claim
43 words
A device according to claim 4, characterized in that the first piston means includes at its inner end facing the pressure space means an abutment ring and in that the clamping means has the predetermined axial play with respect to said abutment ring.
Claim 17
Dependent Claim
53 words
A device according to claim 15, characterized in that the sleeve means arranged below the clamping ring includes at its end facing the pressure space means, a double conical surface, whose radially inner cone surface serves as valve seat and whose radially outer cone surface serves as counter surface for the abutment ring.
Claim 18
Dependent Claim
65 words
A device according to claim 1, characterized in that the second piston means includes a valve disk at its end facing the pressure space and is provided with a central bore open only toward the inside of the first piston means, said central bore being in communication directly above the valve disk by way of radial openings with the surrounding space underneath the clamping means.
Claim 19
Dependent Claim
35 words
A device according to claim 1, characterized in that the reservoir space means is operatively connected by way of lateral bore with a groove means surrounding the first piston means and serving as oil-collecting means.
Claim 20
Dependent Claim
73 words
A device according to claim 1, which includes a ball head provided with an oil bore, arranged on the first piston means and serving as abutment for said transmission means, characterized in that said oil bore is closed off by a suction valve means arranged in the reservoir space means and in that said suction valve means is supported by means of a spring on a spring plate at the second piston means.
Claim 21
Dependent Claim
33 words
A device according to claim 19, characterized in that a rod projecting up to into the second piston means is secured at the suction valve means for pushing open the check valve means.
Claim 22
Dependent Claim
23 words
A device according to claim 19, characterized in that a small notch is provided in the sealing surface of the suction valve means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |