US3592176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid fuel pumping apparatus
Assignee: CAV Ltd
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Filing: 1969-06-16
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Granted: 1971-07-13
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Expires: 1989-06-16
Abstract
Abstract A liquid fuel injection pumping apparatus including an injection pump which can supply fuel in turn to a plurality of outlet ports, each outlet port being connected by a pipeline to an injection nozzle, there being disposed in each outlet port a valve element which is spring loaded in one direction and which is moved by the action of fuel leaving the outlet port, to allow fuel to flow to the pipeline and the remote side of the valve element being subjected to a substantially constant pressure the arrangement being that the valve element will remain in the open position until the pressure in the outlet port has fallen to a predetermined value whereafter the element cuts off the communication between the pipe line and the port and the element acts to pressurize fuel contained in the port and the injection pump until the communication between the injection pump and the port is closed.
Inventors
- 👤 Ivor Fenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/46; F02M59/462; F02M41/00; F02M41/08; F02M41/14; F02M41/1405
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
352 words
A liquid fuel pumping apparatus for supplying fuel under pressure to a multicylinder internal combustion engine and of the kind comprising a body part, an injection pump in the body part, a plurality of outlet ports, formed in the body part and which in use, are connected by pipelines to the injection nozzles of the associated engine, a distributor in the body part and which distributes fuel delivered by the injection pump during successive injection strokes to the outlet parts in turn, a plurality of control valves for controlling the flow of fuel through the outlet ports respectively, each control valve comprising a valve element slidable axially within a cylinder defined in the body part, resilient means acting to urge the element towards one end of the cylinder, passage means through which said one end of the cylinder is in communication with the associated outlet port, an escape port formed in the wall of said cylinder and which is uncovered to said one end of the cylinder during movement of the element against the action of the resilient loading by fuel under pressure flowing through the associated outlet port, or feed pump having an outlet from which fuel can flow to the injection pump, further passage means through which the other end of the cylinder is connected to the outlet of the feed pump, the arrangement beIng such that at the start of injection of fuel the element is moved against the action of its resilient loading by the pressure of fuel generated by the injection pump to uncover the escape port and to permit fuel to flow to the engine and at the end of the injection of fuel the element remains in this position until the pressure of fuel has dropped to a predetermined value, the element then returning towards said one end of the cylinder thereby closing said escape port to maintain said predetermined pressure in the pipeline connected to the escape port and also serving during its return motion to maintain the fuel remaining in the distributor and the injection pump under pressure until the outlet is closed.
Claim 2
Dependent Claim
352 words
A liquid fuel pumping apparatus for supplying fuel under pressure to a multicylinder internal combustion engine and of the kind comprising a body part, an injection pump in the body part, a plurality of outlet ports, formed in the body part and which in use, are connected by pipelines to the injection nozzles of the associated engine, a distributor in the body part and which distributes fuel delivered by the injection pump during successive injection strokes to the outlet parts in turn, a plurality of control valves for controlling the flow of fuel through the outlet ports respectively, each control valve comprising a valve element slidable axially within a cylinder defined in the body part, resilient means acting to urge the element towards one end of the cylinder, passage means through which said one end of the cylinder is in communication with the associated outlet port, an escape port formed in the wall of said cylinder and which is uncovered to said one end of the cylinder during movement of the element against the action of the resilient loading by fuel under pressure flowing through the associated outlet port, or feed pump having an outlet from which fuel can flow to the injection pump, further passage means through which the other end of the cylinder is connected to the outlet of the feed pump, the arrangement beIng such that at the start of injection of fuel the element is moved against the action of its resilient loading by the pressure of fuel generated by the injection pump to uncover the escape port and to permit fuel to flow to the engine and at the end of the injection of fuel the element remains in this position until the pressure of fuel has dropped to a predetermined value, the element then returning towards said one end of the cylinder thereby closing said escape port to maintain said predetermined pressure in the pipeline connected to the escape port and also serving during its return motion to maintain the fuel remaining in the distributor and the injection pump under pressure until the outlet is closed.
Claim 3
Dependent Claim
26 words
An apparatus as claimed in claim 1 including stop means to limit the extent of movement of the element against the action of the resilient loading.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |