Claims
- 1. A device provided on an internal combustion piston engine for changing rotational relations between at least one camshaft and a crankshaft, said device comprising:
- a hydraulic cylinder;
- a supply system for supplying hydraulic fluid to act upon the hydraulic cylinder, said supply system displacing gas cushions prevalent in the hydraulic cylinder and replacing the gas cushions with hydraulic fluid at least in one of the phases selected from the group consisting of before starting operation of the internal combustion piston engine and during starting operation of the internal combustion piston engine; and
- a control unit positioned between the hydraulic cylinder and the supply system, said control unit being so configured as to effect before starting operation of the internal combustion engine a supply of hydraulic fluid from the supply system to the hydraulic cylinder.
- 2. The device of claim 1 wherein the supply system includes a first oil pump driven by the internal combustion piston engine and a second oil pump driven by an electromotor for acting upon the hydraulic cylinder.
- 3. The device of claim 2 wherein separated from an oil pan of the internal combustion piston engine there is provided a separate oil reservoir from which the second oil pump draws oil.
- 4. The device of claim 3 wherein motor oil preheated by a preheater is transported to the hydraulic cylinder by the second oil pump.
- 5. The device of claim 4 wherein the preheater is located in the separate oil reservoir.
- 6. The device of claim 4 wherein the separate oil reservoir, the second oil pump, the electromotor and the preheater are formed as a single structural unit.
- 7. The device of claim 1 wherein the supply system is formed by an oil pump which is driveable by the internal combustion piston engine as well as by an electromotor, with a coupling unit being provided for selectively coupling the oil pump to the electromotor or to the internal combustion piston engine.
- 8. The device of claim 3, and further comprising an oil return line connected from the hydraulic cylinder to the separate oil reservoir.
- 9. The device of claim 1 wherein the supply unit is formed by a hydraulic accumulator.
- 10. The device of claim 9, and further comprising a check valve provided between the hydraulic accumulator and the hydraulic cylinder, said check valve being releasable in the direction of the hydraulic cylinder.
- 11. The device of claim 1 wherein the hydraulic fluid is motor oil.
Parent Case Info
This application is a continuation of pending international application number PCT/EP96/04867, filed Nov. 7,1996.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
39 29 078 |
Mar 1991 |
DEX |
42 27 001 |
Feb 1994 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan vol. 16, No. 578 (M-1346), Dec. 17, 1992 & JP 04 228815 A (Honda Motor Co. Ltd.), Aug. 18, 1992, see abstract. |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/EP96/04867 |
Nov 1996 |
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