Patent US3744465A successfully refreshed from Google Patents.
US3744465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic shuttle vavle for fuel injection pumps
Assignee: Ambac Industries Inc
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Filing: 1972-01-24
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Granted: 1973-07-10
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Expires: 1992-01-24
Abstract
Abstract The output of a fuel injection pump plunger is alternately directed to a pair of injection nozzles by a hydraulically actuated shuttle valve. A shuttle housing incorporated into the high pressure circuit includes a bore containing the valve shuttle which is reciprocated by alternating fuel pressure introduced at each end of the bore. The alternating pressurized fuel is supplied to the bore in timed relationship with the reciprocation of the pump''s plunger by a rotary distributor driven by the pump cam shaft. Means are provided in the shuttle to interconnect the shuttle actuating and the injection pump high pressure passages during the intervals between fuel injection to establish a controlled low pressure level in the high pressure passages prior to the next injection.
Inventors
- 👤 J Voss
- 👤 A Jeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:34
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/02; F02M41/04; F02M41/045; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
240 words
In a fuel injection pump adapted to intermittently supply metered quantities of high pressure fuel to a first fuel injection nozzle, the improvement comprising means for alternately directing the intermittent fuel output of said pump into a second nozzle, said means comprising a hydraulic shuttle assembly including a shuttle housing having a bore therein, a shuttle element slidably disposed in said bore, a delivery passage in said housing for introducing the fuel output of said pump into said shuttle housing bore, a pair of fuel discharge passages in said shuttle housing communicating with said housing bore, said discharge passages being adapted for connection to conduit means for delivering fuel to said first and second fuel injection nozzles, means for establishing limit positions of said slidable shuttle element, means on said shuttle element for providing fluid communication of said delivery passage with one of said discharge passages when said shuttle element is in a first limit position in said bore and for providing fluid communication of said delivery passage with the other of said discharge passages when said shuttle element is in a second limit position in said bore, and means for alternately introducing pressurized fluid into the ends of said shuttle housing bore to move said shuttle element between said limit positions in said bore in timed relationship with the injection output of said pump to thereby alternately direct the pump output between said first and second fuel injection nozzles.
Claim 2
Dependent Claim
240 words
In a fuel injection pump adapted to intermittently supply metered quantities of high pressure fuel to a first fuel injection nozzle, the improvement comprising means for alternately directing the intermittent fuel output of said pump into a second nozzle, said means comprising a hydraulic shuttle assembly including a shuttle housing having a bore therein, a shuttle element slidably disposed in said bore, a delivery passage in said housing for introducing the fuel output of said pump into said shuttle housing bore, a pair of fuel discharge passages in said shuttle housing communicating with said housing bore, said discharge passages being adapted for connection to conduit means for delivering fuel to said first and second fuel injection nozzles, means for establishing limit positions of said slidable shuttle element, means on said shuttle element for providing fluid communication of said delivery passage with one of said discharge passages when said shuttle element is in a first limit position in said bore and for providing fluid communication of said delivery passage with the other of said discharge passages when said shuttle element is in a second limit position in said bore, and means for alternately introducing pressurized fluid into the ends of said shuttle housing bore to move said shuttle element between said limit positions in said bore in timed relationship with the injection output of said pump to thereby alternately direct the pump output between said first and second fuel injection nozzles.
Claim 3
Dependent Claim
36 words
The invention as claimed in claim 1 wherein said means for alternately introducing pressurized fluid into the ends of said shuttle housing bore includes means for simultaneously draining fluid from the opposite ends of said bore.
Claim 4
Dependent Claim
71 words
The invention as claimed in claim 2 wherein said means for introducing and draining fluid from the ends of said shuttle housing bore comprises distributor means connected by conduit means to the ends of said shuttle housing bore, said distributor means being adapted to alternately connect said latter conduit means to a pressurized fluid supply and fluid drain sump, said distributor means being connected with said pump for synchronized operation therewith.
Claim 5
Dependent Claim
98 words
The invention as claimed in claim 1 wherein said shuttle element comprises a cylindrical member having a circumferential groove therein, said shuttle element groove being adapted to communicate at all times with said fuel delivery passage, said shuttle element groove being adapted in one limit position of said shuttle element to communicate with one of said discharge passages to direct fuel from said delivery passage thereinto, said shuttle element groove being adapted in the other limit position of said shuttle element to communicate with the other of said discharge passages to direct fuel from said delivery passage thereinto.
Claim 6
Dependent Claim
35 words
The invention as claimed in claim 4 wherein said shuttle element groove is adapted to communicate with both said discharge passages when said shuttle element is positioned in an intermediate position between said limit positions.
Claim 7
Dependent Claim
52 words
The invention as claimed in claim 4 wherein said shuttle element includes a circumferential balancing groove adjacent each end of said circumferential groove, one of said balancing grooves being adapted to communicate with one of said discharge passages when the other of said discharge passages is in communication with said circumferential groove.
Claim 8
Dependent Claim
27 words
The invention as claimed in claim 1 wherein said means for establishing limit positions of said shuttle element comprises axially spaced inserts in said shuttle housing bore.
Claim 9
Dependent Claim
21 words
The invention as claimed in claim 7 including means for snubbing the movement of said shuttle element into the limit positions.
Claim 10
Dependent Claim
42 words
The invention as claimed in claim 8 wherein said snubbing means comprises means on said inserts adapted to cooperate with the ends of said shuttle element to trap fluid therebetween and thereby prevent destructive contact of said shuttle element with said inserts.
Claim 11
Dependent Claim
22 words
The invention as claimed in claim 1 wherein said pressurized fluid introduced into the ends of said shuttle housing bore comprises fuel.
Claim 12
Dependent Claim
37 words
The invention as claimed in claim 10 wherein said means for alternately introducing the pressurized fuel into the ends of said shuttle housing bore includes means for simultaneously draining fluid from the opposite ends of said bore.
Claim 13
Dependent Claim
71 words
The invention as claimed in claim 11 wherein said means for introducing and draining fuel from the ends of said shuttle housing bore comprises distributor means connected by conduit means to the ends of said shuttle housing bore, said distributor means being adapted to alternately connect said latter conduit means to a pressurized fuel supply and fuel drain sump, said distributor means being connected with said pump for synchronized operation therewith.
Claim 14
Dependent Claim
18 words
The invention as claimed in claim 12 wherein said pressurized fuel supply comprises the fuel pump fuel supply.
Claim 15
Dependent Claim
19 words
The invention as claimed in claim 12 wherein said distributor means comprises a rotary distributor driven by said pump.
Claim 16
Dependent Claim
81 words
The invention as claimed in claim 11 wherein said shuttle element comprises a cylindrical member having first and second axially spaced circumferential grooves therein, said first shuttle groove being adapted to communicate with said delivery passage and one of said discharge passages when said shuttle element is in a first limit position, said second shuttle groove being adapted to communicate with said delivery passage and the other of said discharge passages when said shuttle element is in a second limit position.
Claim 17
Dependent Claim
34 words
The invention as claimed in claim 15 wherein said shuttle element includes passage means therein for filling and pressurizing the idle fuel delivery and discharge passages with pressurized fuel from the shuttle housing bore.
Claim 18
Dependent Claim
99 words
The invention as claimed in claim 16 wherein said shuttle element passage means for filling and pressurizing the idle fuel delivery and discharge passages comprises an intermediate circumferential groove in said shuttle element between said first and second circumferential grooves, said intermediate groove being adapted to communicate with one of said discharge passages when the other of said passages is communicating with one of said first or second shuttle element grooves in a limit position of said shuttle element, and means in said shuttle element for connecting said intermediate groove with the pressurized end of said shuttle housing bore.
Claim 19
Dependent Claim
91 words
The invention as claimed in claim 17 wherein said latter means comprises an axial bore in said shuttle, port means connecting said intermediate shuttle groove with said axial bore, and valve mean for closing said shuttle bore between said intermediate groove port means and the drained end of said shuttle housing bore whereby pressurized fuel passes from the pressurized end of said bore through the shuttle bore, port means and intermediate groove into one of said discharge passages to fill and maintain an above atmospheric residual fuel pressure in said passage.
Claim 20
Dependent Claim
40 words
The invention as claimed in claim 18 wherein said intermediate groove is adapted to communicate with said delivery passage as said shuttle element moves between said limit positions to thereby fill and maintain a residual pressure in said delivery passage.
Claim 21
Dependent Claim
171 words
The invention as claimed in claim 16 wherein said shuttle element passAge means for filling and pressurizing the idle fuel delivery and discharge passages comprises a pair of intermediate circumferential grooves in said shuttle element between said first and second shuttle element grooves, a bore extending from each end of said shuttle element partway thereinto, passage means connecting one of said intermediate shuttle element grooves with one of said shuttle element bores, passage means connecting the other of said shuttle element intermediate grooves with the other of said shuttle element bores, said intermediate grooves and shuttle element bores being disposed and related so that in a first limit position of the shuttle element one of said intermediate grooves communicates with the idle discharge passage and connects the passage with the pressurized end of said shuttle housing bore, and wherein in the second shuttle element limit position the other of said intermediate shuttle element grooves connects the other of said discharge passages with the opposite pressurized end of said shuttle housing bore.
Claim 22
Dependent Claim
42 words
The invention as claimed in claim 20 wherein said intermediate shuttle element grooves are adapted to communicate with said delivery passage as said shuttle element moves between said limit positions to thereby fill and maintain a residual pressure in said delivery passage.
Claim 23
Dependent Claim
35 words
The invention as claimed in claim 15 including means for relieving injection pressure should the shuttle element stop between limit positions with neither the first nor second groove thereof in communication with said delivery passage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |