US3865088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for hydraulically controlling the operation of intake and exhaust valves of internal combustion engines
Assignee: Individual
•
Filing: 1971-10-19
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Granted: 1975-02-11
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Expires: 1991-10-19
Abstract
Abstract In an internal combustion engine wherein the tappet valves are operated by hydraulic means including a delivery pump, in order to ensure a better combustion of fuel during starting and warm-up operation, there is provided an engine temperature-dependent control means for decreasing the output of said delivery pump in the aforenoted two operational ranges to effect a shortening of the length of the tappet valve stroke.
Inventors
- 👤 Heinz Links
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
In means for hydraulically controlling the operation of a tappet valve in a cylinder associated with an internal combustion engine, the improvement comprising A. a slidably held work piston in engagement with said tappet valve, said work piston, during its reciprocation, causing similar displacement of said tappet valve, B. means for delivering liquid under pressure to said work piston for causing reciprocation thereof, said last-named means including a liquid delivery pump, C. intermittently actuated solenoid valve means disposed in the path of said liquid between said pump and said work piston for intermittently admitting liquid under pressure to said work piston, D. means for controlling the output of said pump to control the pressure of said liquid for controlling the stroke amplitude of said tappet valve and Ee. engine temperature-responsive thermostatic control means applying signals to said means defined in (D) for varying the stroke amplitude of said tappet valve as a function of the engine temperature in the same sense as the change of the latter.
Claim 2
Dependent Claim
167 words
In means for hydraulically controlling the operation of a tappet valve in a cylinder associated with an internal combustion engine, the improvement comprising A. a slidably held work piston in engagement with said tappet valve, said work piston, during its reciprocation, causing similar displacement of said tappet valve, B. means for delivering liquid under pressure to said work piston for causing reciprocation thereof, said last-named means including a liquid delivery pump, C. intermittently actuated solenoid valve means disposed in the path of said liquid between said pump and said work piston for intermittently admitting liquid under pressure to said work piston, D. means for controlling the output of said pump to control the pressure of said liquid for controlling the stroke amplitude of said tappet valve and Ee. engine temperature-responsive thermostatic control means applying signals to said means defined in (D) for varying the stroke amplitude of said tappet valve as a function of the engine temperature in the same sense as the change of the latter.
Claim 3
Dependent Claim
45 words
An improvement as defined in claim 1, wherein said means for controlling the output of said pump includes an electronic control apparatus having an input connected to said engine temperature-responsive thermostatic control means and an output connected to said pump for varying the output thereof.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |