US5129380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump
Assignee: ZF International UK Ltd
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Filing: 1991-06-17
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Granted: 1992-07-14
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Expires: 2011-06-17
Abstract
Abstract A fuel injection pump for supplying fuel to an internal combustion engine includes a bore containing a cam actuated pumping plunger. The bore is connected to an outlet during inward movement of the plunger and a spill valve including a spill valve member is operable to spill fuel from the bore to prevent delivery of fuel to the associated engine. The spill valve member includes a piston portion slidable in a cylinder to which fuel under pressure from the bore can be admitted to move the spill valve member to the open position against the action of a spring. The admission of fuel under pressure to the cylinder can be effected by an electromagnetically operable valve or by the use of a control sleeve, recesses on the internal surface of which in conjunction with porting in a rotary part of the pump, form a control valve.
Inventors
- 👤 Stuart W. Nicol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:46
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/365
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
261 words
A fuel injection pump for supplying fuel to an internal combustion engine comprising a pumping plunger slidably mounted in a bore, means for feeding fuel to the bore to effect outward movement of the plunger, cam means for effecting inward movement to the plunger to displace fuel through an outlet, valve means operable to allow fuel to be spilled from the bore to control the quantity of fuel delivered through said outlet, the outlet in use being connected to a fuel injection nozzle incorporating a fuel pressure operable valve member, said valve means comprising a valve member slidable within a cylinder, a seating defined at one end of the cylinder, said valve member defining a head located outside the cylinder, the valve member beneath the head being of reduced diameter to defined with the cylinder an annular clearance in communication with the bore, the remaining portion of the valve member forming a piston in the cylinder, resilient means biasing the head into contact with the seating and a control valve which in a first position connects the other end of the cylinder to the bore such that the bore pressure biases the valve to the open position and in a second position to drain, whereby in said first position of the control valve the head of the valve member will be lifted from the seating to allow fuel to be spilled from the bore and in said second position of the control valve the head will be in engagement with the seating to allow fuel to be displaced through the outlet.
Claim 2
Dependent Claim
261 words
A fuel injection pump for supplying fuel to an internal combustion engine comprising a pumping plunger slidably mounted in a bore, means for feeding fuel to the bore to effect outward movement of the plunger, cam means for effecting inward movement to the plunger to displace fuel through an outlet, valve means operable to allow fuel to be spilled from the bore to control the quantity of fuel delivered through said outlet, the outlet in use being connected to a fuel injection nozzle incorporating a fuel pressure operable valve member, said valve means comprising a valve member slidable within a cylinder, a seating defined at one end of the cylinder, said valve member defining a head located outside the cylinder, the valve member beneath the head being of reduced diameter to defined with the cylinder an annular clearance in communication with the bore, the remaining portion of the valve member forming a piston in the cylinder, resilient means biasing the head into contact with the seating and a control valve which in a first position connects the other end of the cylinder to the bore such that the bore pressure biases the valve to the open position and in a second position to drain, whereby in said first position of the control valve the head of the valve member will be lifted from the seating to allow fuel to be spilled from the bore and in said second position of the control valve the head will be in engagement with the seating to allow fuel to be displaced through the outlet.
Claim 3
Dependent Claim
16 words
A pump according to claim 1 in which said control valve is an electromagnetically operable valve.
Claim 4
Dependent Claim
113 words
A pump according to claim 1 or claim 2 in which said bore is formed in a rotary distributor member mounted for rotation within a sleeve in a pump body, a delivery passage communicating with the bore, the delivery passage registering in turn with an outlet and an inlet port, a first passage communicating said bore with the control valve and a second passage in the distributor member, communicating said other end of the cylinder with said control valve said first and second passages each including portions in the distributor member and the sleeve, there being as many portions of the first and second passages, in the distributor member as there are outlets.
Claim 5
Dependent Claim
60 words
A pump according to claim 3 in which the outer ends of the portions of the second passage communicate with a circumferential groove, a plurality of axial grooves on the distributor member and communicating with said circumferential groove and a drain port with which said axial grooves communicate in turn towards the end of the filling periods of the bore.
Claim 6
Dependent Claim
143 words
A pump according to claim 1 in which said bore is formed in a rotary distributor member mounted in a sleeve in a pump body, a delivery passage communicating with the bore, the delivery passage registering in turn with an outlet and an outlet port a first port on the periphery of the distributor member said first port communicating with said bore, a second port on the periphery of the distributor member and communicating with said other end of the cylinder, a control sleeve mounted about the distributor member and movable axially thereon, and a recess formed in the internal surface of the sleeve, said recess having an inclined leading edge which during inward movement of the plunger uncovers said port to the recess said second port at the instant the first port is uncovered to the recess also communicating with the recess.
Claim 7
Dependent Claim
47 words
A pump according to claim 5 in which the second port is of elongated form and is in communication with the recess during the whole of the pumping cycle of the pump, there being provided a restricted groove communicating with the recess and extending to a drain.
Claim 8
Dependent Claim
61 words
A pump according to claim 5 including a further recess formed in the internal surface of the sleeve, said further recess being positioned relative to the recess so that it is uncovered to a further port at least during the inward movement of the plunger, there being provided a restricted groove communicating with the further recess and extending to a drain.
Claim 9
Dependent Claim
53 words
A pump according to claim 5 including a further recess positioned in advance of the first mentioned recess, the further recess defining an axially extending edge which covers said first port to determine the start of fuel delivery though the outlet, said further recess communicating with a restricted passage extending to a drain.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |