Patent US4785790A successfully refreshed from Google Patents.
US4785790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable compression height piston arrangement
Assignee: Daimler Benz AG
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Filing: 1987-11-09
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Granted: 1988-11-22
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Expires: 2007-11-09
Abstract
Abstract An arrangement for the control of the oil feed into a control chamber of a piston with variable compression height for internal-combustion engines comprises a control valve in the longitudinal bore of a connecting rod that is provided with a flow-through bore for the oil supply of the control chamber in the operation of the internal-combustion engine. This flow-through bore is closed as a function of the inertial forces acting in the oil feed. In order to avoid a ceasing of the oil column in the longitudinal bore, the control valve has an additional control bore that is opened only in the starting phase and via which an additional amount of oil is guided from the lubricating oil circuit of the internal-combustion engine into the control chamber, which accelerates the upward control of the piston.
Inventors
- 👤 Viktor Pfeffer
- 👤 Friedrich Wirbeleit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:23
CPC Classifications
F; F02; F02D; F02D15/00; F02D15/02; F02B; F02B75/00; F02B75/04; F02B75/044
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
An arrangement for controlling the oil feed into a control chamber of a piston with variable compression height, particularly for internal-combustion engines, said control chamber being arranged between an interior piston part coupled to a connecting rod and an exterior piston part that is guided at the interior piston part on the outside, and the oil feed being controlled by a control valve that is inserted into a longitudinal bore of the connecting rod, said control valve having a valve body that can be moved in a valve chamber between a bore portion of the longitudinal bore on the side of the crank pin and a bore portion of the longitudinal bore on the piston side, said valve body closing off the bore portion on the side of the crank pin when resultant forces act in the direction of the crankshaft, wherein the valve body is guided in the bore portion on the piston side and is provided with a flow-through bore that determines the oil inflow volume from the idling operation to the nominal rotational speed, as well as with an additional control bore that is opened only during the starting process for the control of an additional oil inflow volume.
Claim 2
Dependent Claim
202 words
An arrangement for controlling the oil feed into a control chamber of a piston with variable compression height, particularly for internal-combustion engines, said control chamber being arranged between an interior piston part coupled to a connecting rod and an exterior piston part that is guided at the interior piston part on the outside, and the oil feed being controlled by a control valve that is inserted into a longitudinal bore of the connecting rod, said control valve having a valve body that can be moved in a valve chamber between a bore portion of the longitudinal bore on the side of the crank pin and a bore portion of the longitudinal bore on the piston side, said valve body closing off the bore portion on the side of the crank pin when resultant forces act in the direction of the crankshaft, wherein the valve body is guided in the bore portion on the piston side and is provided with a flow-through bore that determines the oil inflow volume from the idling operation to the nominal rotational speed, as well as with an additional control bore that is opened only during the starting process for the control of an additional oil inflow volume.
Claim 3
Dependent Claim
68 words
An arrangement according to claim 1, wherein the valve body comprises a guide shaft in the shape of a hollow cylinder that is inserted into the bore portion on the piston side and has a valve plate that projects into the valve chamber and is enlarged in its diameter, the control bore being provided in the guide shaft, and the flow-through bore being provided in the valve plate.
Claim 4
Dependent Claim
70 words
An arrangement according to claim 1, wherein the bore portion on the side of the crank pin has a cylindrical widening, in which the valve chamber extends between a shoulder at the transition to the bore portion on the piston side and a taper sleeve that is pushed into said widening, the passage bore of said taper sleeve having the same cross-section as the bore portion on the piston side.
Claim 5
Dependent Claim
26 words
An arrangement according to claim 3, wherein the bore portion in the taper sleeve is arranged to be axially offset with respect to the flow-through bore.
Claim 6
Dependent Claim
22 words
An arrangement according to claim 1, wherein a restoring spring is arranged between the shoulder and a collar at the valve plate.
Claim 7
Dependent Claim
70 words
An arrangement according to claim 2, wherein the bore portion on the side of the crank pin has a cylindrical widening, in which the valve chamber extends between a shoulder at the transition to the bore portion on the piston side and a taper sleeve that is pushed into said widening, the passage bore of said taper sleeve having the same cross-section as the bore portion on the piston side.
Claim 8
Dependent Claim
22 words
An arrangement according to claim 6, wherein a restoring spring is arranged between the shoulder and a collar at the valve plate.
Claim 9
Dependent Claim
22 words
An arrangement according to claim 4, wherein a restoring spring is arranged between the shoulder and a collar at the valve plate.
References Cited (Backward Citations)
US3200798A
Cited
US3403662A
Cited
DE1751703A1
Cited
GB1456495A
Cited
SU1044803A2
Cited
US4502421A
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |