US3613650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1969-12-11
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Granted: 1971-10-19
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Expires: 1989-12-11
Abstract
Abstract In the suction tube of an internal combustion engine there is disposed a regulator member which is displaceable by air pressure against the force of a return spring tensioned as a function of engine temperatures. Said regulator member is associated with a fuel metering device to vary the proportion of fuel in the fuelair mixture. The fuel quantities are also varied as a function of an arbitrarily set butterfly valve disposed in the suction tube.
Inventors
- 👤 Gerhard Stumpp
- 👤 Klaus-Jurgen Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/16; F02M69/18; F02M69/22; F02M69/30; F02M69/32; F02M69/46; F02M69/48; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
235 words
In a fuel injection system for internal combustion engines, said system being of the known type that includes (A) a suction tube for drawing intake air, (B) an arbitrarily operable throttle means disposed in said suction tube for controlling the supply of said air, (C) a regulator member at least partially disposed in said suction tube and displaceable therein the response to the pressure of air, said regulator member, dependent upon the flow rate of air determined by said throttle means, varies a flow passage section in said suction tube, said regulator member, dependent upon said flow passage section and by virtue of its displacement, continuously meters fuel by actuating a variable fuel throttle through which the fuel flows with a constant pressure drop and (D) means supplying a return force exerted on said regulator member and opposing the displacement thereof by said pressure, the improvement comprIsing A. a fuel-metering device having a following member, the displacement of which determines the fuel quantities delivered by said fuel-metering device, B. a rotatably and axially displaceably held three-dimensional cam connected with said follower member, said cam is operatively connected with said regulator member and is rotatable thereby, said cam is operatively connected with said arbitrarily operable throttle means and is axially displaceable thereby and C. means for varying the preload on said return force as a function of a variable dependent upon the operation of said engine.
Claim 2
Dependent Claim
235 words
In a fuel injection system for internal combustion engines, said system being of the known type that includes (A) a suction tube for drawing intake air, (B) an arbitrarily operable throttle means disposed in said suction tube for controlling the supply of said air, (C) a regulator member at least partially disposed in said suction tube and displaceable therein the response to the pressure of air, said regulator member, dependent upon the flow rate of air determined by said throttle means, varies a flow passage section in said suction tube, said regulator member, dependent upon said flow passage section and by virtue of its displacement, continuously meters fuel by actuating a variable fuel throttle through which the fuel flows with a constant pressure drop and (D) means supplying a return force exerted on said regulator member and opposing the displacement thereof by said pressure, the improvement comprIsing A. a fuel-metering device having a following member, the displacement of which determines the fuel quantities delivered by said fuel-metering device, B. a rotatably and axially displaceably held three-dimensional cam connected with said follower member, said cam is operatively connected with said regulator member and is rotatable thereby, said cam is operatively connected with said arbitrarily operable throttle means and is axially displaceable thereby and C. means for varying the preload on said return force as a function of a variable dependent upon the operation of said engine.
Claim 3
Dependent Claim
103 words
An improvement as defined in claim 1, wherein said means for varying the preload on said return force is a temperature-dependent control element, said improvement further includes A. a lever pivotable about an axis, said three-dimensional cam is connected with said follower member through said lever, said lever is operatively connected with said temperature-dependent control element and displaceable thereby to shift said last-named axis parallel to itself, B. a bypass interconnecting portions of said suction tube and C. means connecting said temperature-dependent control element with said bypass to establish and break communication between said portions in response to the temperature of said engine.
Claim 4
Dependent Claim
69 words
An improvement as defined in claim 15, wherein said regulator member includes A. a baffle plate disposed in said suction tube normal to the flow of said air therein, B. a guide rod fixedly attached to said baffle plate and extending parallel with the flow of said air and C. a guide sleeve fixedly held within said suction tube coaxially therewith, said guide sleeve slidably receives said guide rod.
Claim 5
Dependent Claim
49 words
An improvement as defined in claim 3, including A. a lever connected to said guide rod and turnable thereby and B. a shaft affixed to said lever and rotatable thereby, said three-dimensioned cam is axially slidably mounted on said shaft and is constrained to rotate therewith as a unit.
Claim 6
Dependent Claim
66 words
An improvement as defined in claim 4, wherein said means supplying said return force is a spring, said means for varying the preload on said spring is a temperature-dependent control element; one end of said spring is attached to said lever, the other end of said spring is attached to an additional lever displaceable by said temperature-dependent control element for varying the preload on said spring.
Claim 7
Dependent Claim
115 words
An improvement as defined in claim 3, including A. a shaft rotatably held in said suction tube and carrying a throttle member fixedly attached thereto and forming part of said arbitrarily operable throttle means, B. a cam affixed to said shaft and rotating therewith in unison, C. a level pivotable about a stationary axis, one end of said lever carries a follower in engagement with said last-named cam, the other end of said lever is in engagement with said three-dimensional cam to displace the latter axially dependent upon the rotation of said shaft and D. a spring in engagement with said three-dimensional cam to oppose the axial displacement of the latter caused by said lever.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |