Patent US3861833A successfully refreshed from Google Patents.
US3861833A
Expired / Lapsed
US
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Fuel injection pump
Assignee: Stanadyne LLC
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Filing: 1973-02-28
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Granted: 1975-01-21
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Expires: 1993-02-28
Abstract
Abstract A liquid fuel injection pump for supplying precisely measured charges of fuel under high prssure, has a housing in which a fuel distributing rotor is journaled. The rotor carries a high pressure charge pump for pressurizing the charges of fuel and a pair of through bores in the housing mount a pair of shuttles which alternate in pumping measured charges of fuel into the charge pump chamber. Fuel regulated by a metering valve is delivered to a chamber at one end of each shuttle and the fuel charge so produced is then pumped into the charge pump chamber by applying hydraulic pressure to the other end of the shuttle. A ball check valve carried by the rotor isolates the shuttles from the charge pump. An axially adjustable stop at each end of each through bore limits the movement of each shuttle in each direction and the stops for each shuttle are accessible through the end of its through bore for changing the limit of movement of the shuttle in each direction independently of the other stop for the shuttle. A passage supplies fuel to a closer plunger which hydraulically seats the ball check valve and the fuel trapped between the plunger and its stop cushions the impact therebetween as the charge pump pressurizes the pressure, in the rotor.
Inventors
- 👤 Daniel Salzgeber
- 👤 Robert Raufeisen
- 👤 Charles W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:15
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/14; F02M41/1405
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
217 words
A liquid fuel injection pump suited for the delivery of measured charges of liquid fuel under high pressure to an associated engine comprising a pump chamber wherein the charges are pressurized to high pressure, means for metering the fuel delivered to the pump chamber to provide measured charges of fuel in amounts correlated with engine operating conditions, a pair of through bores in the housing of said pump respectively mounting a pair of shuttles, first chambers respectively disposed at one end of each of said pair of shuttles alternatively receiving the measured charges of fuel prior to their delivery to the pump chamber, a second chambers respectively disposed at the other end of each of said shuttles, a source of hydraulic pressure connected to said second chambers to actuate said shuttles alternatively to deliver the previously metered charges of fuel to the pump chamber, means for isolating said shuttle mechanism from said pump chamber during the pressurizing of the charges in said pump chamber and an axially adjustable stop at each end of each through bore limiting the movement of each shuttle in each direction, the stops foR each shuttle being accessible through the ends of its through bore and independent of each other for charging the limit of the movement of each shuttle in each direction.
Claim 2
Dependent Claim
217 words
A liquid fuel injection pump suited for the delivery of measured charges of liquid fuel under high pressure to an associated engine comprising a pump chamber wherein the charges are pressurized to high pressure, means for metering the fuel delivered to the pump chamber to provide measured charges of fuel in amounts correlated with engine operating conditions, a pair of through bores in the housing of said pump respectively mounting a pair of shuttles, first chambers respectively disposed at one end of each of said pair of shuttles alternatively receiving the measured charges of fuel prior to their delivery to the pump chamber, a second chambers respectively disposed at the other end of each of said shuttles, a source of hydraulic pressure connected to said second chambers to actuate said shuttles alternatively to deliver the previously metered charges of fuel to the pump chamber, means for isolating said shuttle mechanism from said pump chamber during the pressurizing of the charges in said pump chamber and an axially adjustable stop at each end of each through bore limiting the movement of each shuttle in each direction, the stops foR each shuttle being accessible through the ends of its through bore and independent of each other for charging the limit of the movement of each shuttle in each direction.
Claim 3
Dependent Claim
51 words
The fuel injection pump of claim 1 wherein each shuttle is bottomed against one of its stops at the beginning of the delivery of each measured charge to the first chamber associated therewith, and the one stop is axially movable during operation in response in an operating condition of the engine.
Claim 4
Dependent Claim
53 words
The fuel injection pump of claim 2 wherein the other of said stops for limiting the movement of each shuttle is threaded into said through bore to provide for a vernier calibration of the maximum shuttle stroke of each shuttle whereby the maximum stroke of each shuttle may be identical despite manufacturing variations.
Claim 5
Dependent Claim
24 words
The fuel injection pump of claim 2 wherein said movable stops comprise cylindrical members respectively precision-fitted in said through bores for axial movement therein.
Claim 6
Dependent Claim
30 words
The fuel injection pump of claim 4 wherein each of said movable stops have substantially greater mass than said shuttles whereby the stops serves as energy absorbers for the shuttles.
Claim 7
Dependent Claim
201 words
The pump of claim 1 wherein said isolating means comprises a check valve positioned between the inlet passage and said pump chamber to isolate the inlet passage from said pump chamber during the pressurizing of the fuel therein, a closer plunger for seating said check valve, a passage for continuously supplying fuel under pressure to the end of said closer plunger opposite said check valve to seat said check valve after the delivery of a charge of fuel to said pump chamber and before the pressurization thereof, a stop engageable with said end of said closer plunger for limiting the movement of said closer plunger away from said check valve under the infleunce of the high pressure generated in said pump chamber, said passage for supplying fuel under pressure communicating with said end of said closer plunger through a port substantially in the plane of said end of said closer plunger, said end of said closer plunger and the mating surface of said stop being flat to form a pump to radially squeeze out the fuel trapped therebetween through an increasingly restricted passage as the closer plunger approaches the stop thereby to cushion the impact of the plunger against the stop.
Claim 8
Dependent Claim
37 words
The fuel injection pump of claim 6 wherein the stop provides a recess and the flat end of the closer plunger overlies the recess to pressurize the fuel trapped therein as the closer plunger approaches the stop.
Claim 9
Dependent Claim
20 words
The fuel injection pump of claim 7 wherein the button is provided with a hole therethrough to form said recess.
Claim 10
Dependent Claim
31 words
The fuel injection pump of claim 6 wherein the engaging surfaces of said closer plunger and said stop define a chamber in which trapped fuel is pressurized by the engagement thereof.
Claim 11
Dependent Claim
30 words
The fuel injection pump as recited in claim 9 wherein the stop comprises a removable button which is spring biased toward the bottom of a closed recess in the rotor.
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |