US3818883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isochronous governor
Assignee: Caterpillar Inc
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Filing: 1971-11-26
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Granted: 1974-06-25
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Expires: 1991-11-26
Abstract
Abstract An isochronous governor having structure which provides a pressure force to compensate for the relative decrease of governor spring force with respect to flyweight force as engine load increases, thereby allowing the engine controlled by the governor to maintain operation at a constant speed under varying load high idle, no load speed, at all times. In a turbocharged engine, inlet manifold air pressure may be utilized to produce the force. The air pressure directly related to engine load acts upon a small piston and the resulting pressure force, approximately equal to the difference between the spring and the flyweight forces as engine load increases, acts upon the governor structure to properly position the fuel pump rack to maintain a desired engine speed. Engine oil pressure may alternatively be utilized to provide the required pressure force, and a second lever, positioned by the fuel pump rack, serves to preload a relief valve in the engine oil pressure system, thereby controlling the oil pressure in the system as a function of the fuel rack position.
Inventors
- 👤 S Glassey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:14
CPC Classifications
F; F02; F02D; F02D1/00; F02D2700/00; F02D2700/02; F02D2700/0269; F02D2700/0282; F02D2700/0284; F02D2700/0287
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
294 words
In an engine governor including a housing having means for maintaining a desired engine speed and having a fuel control member regulating the flow of fuel into the engine, a movable member positioned adjacent to said fuel control member for moving the same, flyweight means mounted adjacent said movable member and controlling its movement and said fuel control member to position the latter to increase the flow of fuel in response to an increased engine load and inward movement of said flyweight means, spring means mounted adjacent to said flyweight means and assisting its movement of said fuel control member upon increased engine load, and fluid pressure means creating an additive force disposed adjacent said spring means and serving to assist its movement and said fuel control member in response to increased engine load to insure that sufficient fuel is entering said engine as said flyweights begin to move outwardly, said fluid pressure means comprising means generating an increasing pressure proportional to engine load, and piston means for converting the pressure into said additive force, said piston means comprising a chamber in said housing, a piston movably mounted in said chamber, linkage means interconnecting one side of said piston with a rod engaging said spring means, said linkage means comprising a generally elongated lever pivotally mounted intermediate its ends about a pivot, one end of said lever adapted for moving said rod and the other end of said lever being linked to said one side of said piston, means in said lever adjusting the lever pivot point for changing the leverage of said lever, conduit means intercommunicating said pressure generating means with said chamber on the other side of said piston, and means adjustably disposed in said conduit means for controlling the pressure therein.
Claim 2
Dependent Claim
294 words
In an engine governor including a housing having means for maintaining a desired engine speed and having a fuel control member regulating the flow of fuel into the engine, a movable member positioned adjacent to said fuel control member for moving the same, flyweight means mounted adjacent said movable member and controlling its movement and said fuel control member to position the latter to increase the flow of fuel in response to an increased engine load and inward movement of said flyweight means, spring means mounted adjacent to said flyweight means and assisting its movement of said fuel control member upon increased engine load, and fluid pressure means creating an additive force disposed adjacent said spring means and serving to assist its movement and said fuel control member in response to increased engine load to insure that sufficient fuel is entering said engine as said flyweights begin to move outwardly, said fluid pressure means comprising means generating an increasing pressure proportional to engine load, and piston means for converting the pressure into said additive force, said piston means comprising a chamber in said housing, a piston movably mounted in said chamber, linkage means interconnecting one side of said piston with a rod engaging said spring means, said linkage means comprising a generally elongated lever pivotally mounted intermediate its ends about a pivot, one end of said lever adapted for moving said rod and the other end of said lever being linked to said one side of said piston, means in said lever adjusting the lever pivot point for changing the leverage of said lever, conduit means intercommunicating said pressure generating means with said chamber on the other side of said piston, and means adjustably disposed in said conduit means for controlling the pressure therein.
Claim 3
Dependent Claim
15 words
The invention of claim 1 wherein the means generating increasing pressure is an engine manifold.
Claim 4
Dependent Claim
16 words
The invention of claim 1 wherein the means generating increasing pressure is an engine lubricant system.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |