Patent US5511956A successfully refreshed from Google Patents.
US5511956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure fuel pump for internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1994-06-20
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Granted: 1996-04-30
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Expires: 2014-06-20
Abstract
Abstract A high pressure pump for an engine fuel injection system, wherein the pump has a plurality of positive displacement pumping devices that are operating so that their delivery cycles overlap and so that the instantaneous speed of the pumping devices during their delivery strokes is constant so as to minimize pressure variations in the system and avoid the necessity of having the pump being driven in synchronized relationship to the engine output shaft. This permits the use of a variable speed drive so that the pump can be driven at speed ratios depending upon engine demand and/or eliminates the necessity for positive drives to maintain synchronization. A number of embodiments showing different pump configurations are disclosed.
Inventors
- 👤 Hiroshi Hasegawa
- 👤 Takeo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:23
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/02; F02M59/04; F02M59/06; F02M39/00; F02M39/02; F02M59/08
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
118 words
A pump for a fuel injection system, comprising a plurality of positive displacement pumping devices for pumping fuel to a fuel delivery system supplying at least one fuel injector, each movable in a cycle through a suction phase during which fuel is drawn into said pumping device and a delivery phase during which fuel is pumped by said pumping device, drive means for driving said pumping devices, said drive means and said pumping devices being interrelated so that the pumping strokes of said pumping devices overlap each other, at least two of said pumping devices are always in a delivery phase, and the sum of the instantaneous speed of the pumping devices during the pumping strokes is constant.
Claim 2
Dependent Claim
118 words
A pump for a fuel injection system, comprising a plurality of positive displacement pumping devices for pumping fuel to a fuel delivery system supplying at least one fuel injector, each movable in a cycle through a suction phase during which fuel is drawn into said pumping device and a delivery phase during which fuel is pumped by said pumping device, drive means for driving said pumping devices, said drive means and said pumping devices being interrelated so that the pumping strokes of said pumping devices overlap each other, at least two of said pumping devices are always in a delivery phase, and the sum of the instantaneous speed of the pumping devices during the pumping strokes is constant.
Claim 3
Dependent Claim
13 words
The pump of claim 1, wherein the pumping devices comprise reciprocating plunger pumps.
Claim 4
Dependent Claim
17 words
The pump of claim 2, wherein the reciprocating plungers are driven by a cam on a camshaft.
Claim 5
Dependent Claim
20 words
The pump of claim 3, wherein each plunger is driven through more than one cycle per rotation of the camshaft.
Claim 6
Dependent Claim
29 words
The pump of claim 4, wherein the phase relation is such that the pump plungers reach their top dead-center positions at equal angle increments of rotation of the camshaft.
Claim 7
Dependent Claim
29 words
The pump of claim 3, wherein the phase relation is such that the pump plungers reach their top dead-center positions at equal angle increments of rotation of the camshaft.
Claim 8
Dependent Claim
20 words
The pump of claim 6, wherein the pump plungers are radially disposed and are all operated by a common camshaft.
Claim 9
Dependent Claim
16 words
The pump of claim 7, wherein the pump plungers are operated by the same cam lobe.
Claim 10
Dependent Claim
35 words
The pump of claim 8, wherein there are a plurality of cam lobes on the camshaft so that each pump plunger operates through a plurality of pumping strokes on a single rotation of the camshaft.
Claim 11
Dependent Claim
32 words
The pump of claim 3, wherein the relationship of the cam to the reciprocating plunger is such that the plunger moves more rapidly through its suction phase than through its delivery phase.
Claim 12
Dependent Claim
48 words
The pump of claim 1, wherein the pump is driven by an internal combustion engine to which the fuel injection system supplies fuel and wherein the pump drive shaft is not synchronized to maintain a specific angular relationship between the pump drive shaft and the engine output shaft.
Claim 13
Dependent Claim
22 words
The pump of claim 11, wherein the pump drive shaft is driven by the engine output shaft through a variable speed drive.
Claim 14
Dependent Claim
31 words
The pump of claim 12, wherein the pump drive shaft is driven at a speed ratio from the engine output shaft that increases in response to an increase in engine demand.
Claim 15
Dependent Claim
35 words
The pump of claim 13 further including means for starting the engine and means for varying the speed ratio of the variable speed drive in response to operation of the means for starting the engine.
Claim 16
Dependent Claim
21 words
The pump of claim 13 wherein the speed ratio of the variable speed drive is changed in response to engine speed.
Claim 17
Dependent Claim
21 words
The pump of claim 13 when the speed ratio and the variable speed drive is changed in response to engine load.
Claim 18
Dependent Claim
13 words
The pump of claim 12, wherein the pumping devices comprise reciprocating plunger pumps.
Claim 19
Dependent Claim
17 words
The pump of claim 17, wherein the reciprocating plungers are driven by a cam on a camshaft.
Claim 20
Dependent Claim
20 words
The pump of claim 18, wherein each plunger is driven through more than one cycle per rotation of the camshaft.
Claim 21
Dependent Claim
29 words
The pump of claim 19, wherein the phase relation is such that the pump plungers reach their top dead-center positions at equal angle increments of rotation of the camshaft.
Claim 22
Dependent Claim
29 words
The pump of claim 18, wherein the phase relation is such that the pump plungers reach their top dead-center positions at equal angle increments of rotation of the camshaft.
Claim 23
Dependent Claim
20 words
The pump of claim 21, wherein the pump plungers are radially disposed and are all operated by a common camshaft.
Claim 24
Dependent Claim
16 words
The pump of claim 22, wherein the pump plungers are operated by the same cam lobe.
Claim 25
Dependent Claim
35 words
The pump of claim 23, wherein there are a plurality of cam lobes on the camshaft so that each pump plunger operates through a plurality of pumping strokes on a single rotation of the camshaft.
Claim 26
Dependent Claim
41 words
The pump of claim 1, wherein the suction phase occurs during a smaller interval than the delivery phase so that a lesser number of pumping devices are in a suction phase at a given time than are in a delivery phase.
Claim 27
Dependent Claim
61 words
A fuel injection system for an internal combustion engine having an output shaft, a fuel injector, a high pressure positive displacement fuel pump for pumping fuel to said fuel injector, and a variable speed transmission for driving said fuel pump from said engine output shaft without controlling the timing relationship between said engine output shaft and said high pressure fuel pump.
Claim 28
Dependent Claim
61 words
A fuel injection system for an internal combustion engine having an output shaft, a fuel injector, a high pressure positive displacement fuel pump for pumping fuel to said fuel injector, and a variable speed transmission for driving said fuel pump from said engine output shaft without controlling the timing relationship between said engine output shaft and said high pressure fuel pump.
Claim 29
Dependent Claim
16 words
A system as set forth in claim 26 wherein the transmission comprises a continuously variable transmission.
Claim 30
Dependent Claim
23 words
A system as set forth in claim 27 wherein the continuously variable transmission has its speed ratio controlled in response to engine conditions.
Claim 31
Dependent Claim
38 words
A system as set forth in claim 28 further including means for starting the engine and means for varying the speed ratio of the variable speed transmission in response to operation of the means for starting the engine.
Claim 32
Dependent Claim
24 words
A system as set forth in claim 28 wherein the speed ratio of the variable speed transmission is changed in response to engine speed.
Claim 33
Dependent Claim
24 words
A system as set forth in claim 28 wherein the speed ratio and the variable speed drive is changed in response to engine load.
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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) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |