Patent US3847510A successfully refreshed from Google Patents.
US3847510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pumps for internal combustion engines
Assignee: CAV Ltd
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Filing: 1973-11-26
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Granted: 1974-11-12
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Expires: 1993-11-26
Abstract
Abstract A fuel injection pump includes a body in which is formed a bore. A two part plunger is located in the bore and the plunger is moved inwardly by means of a cam. The two parts of the plunger are separated by a space which during outward movement of the plunger under the action of a spring, is filled with fuel. During inward movement of the plunger, a port is initially closed by the outer plunger part, but before this occurs limited relative movement of the parts of the plunger takes place. The extent of such relative movement prior to the closure of the port determines the effective length of the plunger, and the instant at which fuel is supplied through an outlet to an associated engine.
Inventors
- 👤 I Fenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:15
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A fuel injection pump for supplying fuel to internal combustion engines, the pump comprising a body part in which is defined a bore, an outlet from one end of the bore, a plunger reciprocably mounted in the bore, cam means for imparting movement to the plunger in a direction inwardly towards said one end of the bore, a filling port formed in the wall of the bore, said filling port being covered by an end of the plunger during inward movement thereof thereby to cause fuel to flow through said outlet, means for moving the plunger in an outward direction, said plunger being divided into two parts, a space between said plunger partS being filled with liquid, the quantity of liquid varying in accordance with the speed at which the pump is driven so that the effective length of the plunger varies, and thereby the instant at which said port is closed by the plunger also varies.
Claim 2
Dependent Claim
157 words
A fuel injection pump for supplying fuel to internal combustion engines, the pump comprising a body part in which is defined a bore, an outlet from one end of the bore, a plunger reciprocably mounted in the bore, cam means for imparting movement to the plunger in a direction inwardly towards said one end of the bore, a filling port formed in the wall of the bore, said filling port being covered by an end of the plunger during inward movement thereof thereby to cause fuel to flow through said outlet, means for moving the plunger in an outward direction, said plunger being divided into two parts, a space between said plunger partS being filled with liquid, the quantity of liquid varying in accordance with the speed at which the pump is driven so that the effective length of the plunger varies, and thereby the instant at which said port is closed by the plunger also varies.
Claim 3
Dependent Claim
79 words
A pump as claimed in claim 1 including a further port provided in the wall of the bore, said further port being uncovered to the space between the plunger parts so that said space is completely filled with liquid prior to the inward movement of the plunger, liquid being displaced out of said space through said further port until said further port is closed, the quantity of liquid remaining in said space determining the effective length of the plunger.
Claim 4
Dependent Claim
32 words
A pump as claimed in claim 2 including a valve operable to control the pressure in said one end of the bore prior to closure of the filling port by the plunger.
Claim 5
Dependent Claim
46 words
A pump as claimed in claim 3 in which said filling port communicates with a source of fuel under pressure, said further port being adapted to communicate with a further source of fuel, having a pressure higher than that of the first mentioned source of fuel.
Claim 6
Dependent Claim
35 words
A pump as claimed in claim 3 in which said filling port and said further port communicate with a source of fuel under pressure there being interposed between the plunger parts a coiled compression spring.
Claim 7
Dependent Claim
60 words
A pump as claimed in claim 4 in which the part of the plunger at the inner end of the bore is provided with an inclined control edge which uncovers said filling port to terminate the delivery of fuel through the outlet, said part of the plunger being angularly adjustable to determine the quantity of fuel supplied through the outlet.
Claim 8
Dependent Claim
60 words
A pump, as claimed in claim 5, in which the part of the plunger at the inner end of the bore is provided with an inclined control edge, which uncovers said filling port to terminate the delivery of fuel through the outlet, said part of the plunger being angularly adjustable to determine the quantity of fuel supplied through the outlet.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |