US3735745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decompression device for internal combustion engines
Assignee: Motorenfabrik Hatz GmbH and Co KG
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Filing: 1971-03-29
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Granted: 1973-05-29
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Expires: 1991-03-29
Abstract
Abstract A decompression device for an internal combustion engine in which the control parts which open and close the exhaust valves of the combustion chambers include a rocking lever acting on the valve. The decompression device includes an eccentric bearing on which the rocking lever is freely mounted, rotation of the eccentric bearing thus moving the axis of the rocking lever to prevent full closing of the exhaust valve, that is, provide decompression of the chamber. The eccentric bearing may be turned to reference position at which it permits full closing of the exhaust valve by either manual or automatic means.
Inventors
- 👤 E Hatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:10
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
358 words
A device for decompressing a combustion chamber of an internal combustion engine of the type in which the chamber has an exhaust valve, a rocking lever mounted on a mounting shaft for movement thereabout to operatively engage the exhaust valve to open the same, and a closing means for closing the valve in the absence of an opening force applied by the rocking lever, said device comprising: a decompression cam in the form of an eccentric bearing mounted on said mounting shaft eccentrically relative to the axis of the mounting shaft and for rotation with the mounting shaft, said rocking lever being freely mounted on the eccentric bearing such that rotation of the eccentric bearing varies the position of the axis of rotation of the rocking lever, said eccentric bearing being positioned and shaped such that in at least one position the exhaust valve is permitted to close all the way, and in a plurality of other positions the rocking lever prevents the closing member from closing the exhaust valve all the way, thus providing a decompression opening of the chamber, a setting member mounted to actuate the mounting shaft to rotate said eccentric bearing to any one of a plurality of angular positions to set the rocking lever to any one of said plurality of other positions including a maximum decompression valve opening position or any one of a plurality of valve opening positions between the maximum opening and the valve closed position, the magnitude of this decompression opening being variable at will and dependent on the angular position of said setting member and thus on the angular position of the eccentric bearing, and a return means for automatically turning the eccentric bearing from the said other positions to said one position in response to operation of the internal combustion engine, said return means comprising a toothed disc mounted for rotational movement with the mounting shaft, and a member mounted for oscillating movement upon normal operation of the engine, said member being operatively engaged with the teeth of the disc to turn the disc in steps by engaging and turning one tooth during each of said oscillations.
Claim 2
Independent Claim
358 words
A device for decompressing a combustion chamber of an internal combustion engine of the type in which the chamber has an exhaust valve, a rocking lever mounted on a mounting shaft for movement thereabout to operatively engage the exhaust valve to open the same, and a closing means for closing the valve in the absence of an opening force applied by the rocking lever, said device comprising: a decompression cam in the form of an eccentric bearing mounted on said mounting shaft eccentrically relative to the axis of the mounting shaft and for rotation with the mounting shaft, said rocking lever being freely mounted on the eccentric bearing such that rotation of the eccentric bearing varies the position of the axis of rotation of the rocking lever, said eccentric bearing being positioned and shaped such that in at least one position the exhaust valve is permitted to close all the way, and in a plurality of other positions the rocking lever prevents the closing member from closing the exhaust valve all the way, thus providing a decompression opening of the chamber, a setting member mounted to actuate the mounting shaft to rotate said eccentric bearing to any one of a plurality of angular positions to set the rocking lever to any one of said plurality of other positions including a maximum decompression valve opening position or any one of a plurality of valve opening positions between the maximum opening and the valve closed position, the magnitude of this decompression opening being variable at will and dependent on the angular position of said setting member and thus on the angular position of the eccentric bearing, and a return means for automatically turning the eccentric bearing from the said other positions to said one position in response to operation of the internal combustion engine, said return means comprising a toothed disc mounted for rotational movement with the mounting shaft, and a member mounted for oscillating movement upon normal operation of the engine, said member being operatively engaged with the teeth of the disc to turn the disc in steps by engaging and turning one tooth during each of said oscillations.
Claim 3
Dependent Claim
45 words
A device according to claim 1, said setting member including a handle grip fixedly connected relative to said eccentric bearing to turn the eccentric bearing and the mounting shaft about the axis of the latter at will to one of said plurality of angular positions.
Claim 4
Dependent Claim
84 words
A device according to claim 1, wherein said member is an oscillating lever mounted to rotate freely about the said mounting shaft and controllable to operate an inlet valve of the said chamber, and a spring tongue element connected to the oscillating lever and engaging the teeth of the discs, such that in one direction of movement of the oscillating lever, the tongue turns the disc and the mounting shaft, and in the opposite direction it is sprung out of contact with the disc.
Claim 5
Dependent Claim
105 words
A device according to claim 3, wherein the said disc is fixed to the mounting shaft immediately adjacent the said rocking lever. 5. A device according to claim 1, wherein said member is an oscillating lever, and including a spring tongue element connected to the oscillating lever and engaging the teeth of the discs, said tongue being biassed radially inwardly relative to the disc and sufficiently resilient to pass over the teeth, such that in one direction of movement of the oscillating lever the tongue turns the disc and mounting shaft and in the opposite direction it is sprung out of contact with the disc.
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |