Patent US3911873A successfully refreshed from Google Patents.
US3911873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable internal combustion engine valve operating system
Assignee: Individual
•
Filing: 1973-09-20
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Granted: 1975-10-14
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Expires: 1993-09-20
Abstract
Abstract System for automatic variation of valve operation including an apparatus and method utilizing the intake manifold vacuum of an internal combustion engine to control the position of auxiliary sleeve valves adjacent the conventional engine valves and thereby change the effective opening and closing of the engine valves, to provide control over swirl and to vary charge stratification within the combustion chamber. The result is an automatic adjustment of valve timing as a function of intake manifold vacuum, engine speed or accelerator pedal position to obtain maximum efficiency and low emissions throughout the operating range of the engine from idle through wide open throttle. An additional benefit that may be incorporated is improved engine braking as well as lowered emissions under deceleration conditions.
Inventors
- 👤 Sharad M Dave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:12
CPC Classifications
F; F01; F01L; F01L31/00; F01L31/08; F01L13/00; F01L13/0015; F01L13/06; F01L13/08; F01L3/00; F01L3/06; F02; F02B; F02B17/00; F02B2275/00; F02B2275/34; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S123/00; Y10S123/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
143 words
An improved internal combustion engine having a piston and a cylinder and a head delimiting a combustion chamber, a first inlet passage communicating with said combustion chamber, a valve seat at the juncture of said passage with said combustion chamber and an inlet valve seatable on said valve seat, characterized by a sleeve valve mounted in said inlet passage, an annular shoulder on the passage side of said inlet valve, said shoulder having a minimum diameter sufficient to clear the inner periphery of said sleeve valve, actuatable means to vary the position of said sleeve valve relative to said valve seat thereby varying the effective opening and the effective closing of said inlet valve, a second inlet passage communicating with said combustion chamber and formed to direct the fuel mixture in said second inlet passage into a particular portion of said combustion chamber.
Claim 2
Dependent Claim
143 words
An improved internal combustion engine having a piston and a cylinder and a head delimiting a combustion chamber, a first inlet passage communicating with said combustion chamber, a valve seat at the juncture of said passage with said combustion chamber and an inlet valve seatable on said valve seat, characterized by a sleeve valve mounted in said inlet passage, an annular shoulder on the passage side of said inlet valve, said shoulder having a minimum diameter sufficient to clear the inner periphery of said sleeve valve, actuatable means to vary the position of said sleeve valve relative to said valve seat thereby varying the effective opening and the effective closing of said inlet valve, a second inlet passage communicating with said combustion chamber and formed to direct the fuel mixture in said second inlet passage into a particular portion of said combustion chamber.
Claim 3
Dependent Claim
21 words
The improved engine of claim 1 wherein the outlet of said second inlet passage is located within said first inlet passage.
Claim 4
Dependent Claim
28 words
The improved engine of claim 2 wherein said second inlet passage includes an extensible end adapted to vary the distance between said passage outlet and said combustion chamber.
Claim 5
Dependent Claim
16 words
The improved engine of claim 3 wherein said extensible end is attached to said sleeve valve.
Claim 6
Dependent Claim
32 words
The improved engine of claim 4 wherein said second inlet passage supplies a relatively rich fuel mixture for increasing the stratification in said combustion chamber in cooperation with increasing sleeve valve actuation.
Claim 7
Dependent Claim
20 words
The improved engine of claim 3 including means to actuate said extensible end in opposition to said sleeve valve actuation.
Claim 8
Dependent Claim
32 words
The improved engine of claim 6 wherein said second inlet passage supplies a relatively rich fuel mixture for increasing the stratification in said combustion chamber in cooperation with decreasing sleeve valve actuation.
Claim 9
Dependent Claim
32 words
The improved engine of claim 3 wherein said second inlet passage supplies a relatively rich fuel mixture for increasing the stratification in said combustion chamber upon actuation independent of sleeve valve actuation.
Claim 10
Dependent Claim
25 words
The improved engine of claim 2 wherein said second inlet passage supplies a relatively rich fuel mixture for increasing the stratification in said combustion chamber.
Claim 11
Dependent Claim
28 words
The improved engine of claim 2 including means to vary the air-fuel ratio entering said second inlet passage relative to the air-fuel ratio in said first inlet passage.
Claim 12
Dependent Claim
27 words
The improved engine of claim 1 wherein the variable inlet means comprises a sleeve extendable and retractable within the carburetor veNturi in response to engine operation condition.
References Cited (Backward Citations)
US903020A
Cited
US2803230A
Cited
US3171395A
Cited
US3283751A
Cited
US3507261A
Cited
US3659564A
Cited
US3557762A
Cited
US3762381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |