EP0834013B1 - Pompe a carburant - Google Patents
Pompe a carburant Download PDFInfo
- Publication number
- EP0834013B1 EP0834013B1 EP96914714A EP96914714A EP0834013B1 EP 0834013 B1 EP0834013 B1 EP 0834013B1 EP 96914714 A EP96914714 A EP 96914714A EP 96914714 A EP96914714 A EP 96914714A EP 0834013 B1 EP0834013 B1 EP 0834013B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- valve body
- piston
- piston valve
- interval
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 42
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 description 9
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000003467 diminishing effect Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
Definitions
- the present invention relates to a fuel pump control valve assembly and method of operating same for dampening control valve motion in a heavy duty truck diesel fuel injection system including either a unit pump or unit fuel injectors.
- Fuel control valve assemblies in vehicular fuel injection systems typically include a housing having a control valve chamber, a control valve having a piston valve body, and a valve stop. Electromagnetic actuators are commonly used in control valve assemblies for electronically controlling actuation of the control valve. Examples are shown in U.S. Patent Numbers 4,618,095, assigned to the assignee of the present invention, and 4,501,246.
- a primary disadvantage associated with existing control valve assemblies is the fact that upon contact of the control valve with the control valve stop, the control valve may "bounce” off the valve stop in diminishing series fashion as illustrated in Figure 6a before finally closing. This control valve "bounce” can significantly lessen the precision of the fuel flow process, and thereby the combustion efficiency.
- the present invention also contemplates such a control valve assembly wherein the damping of the control valve at one or both ends of its stroke may be controlled electronically by adjusting current levels to the control valve armature coil and the one of this control technique particularly in pilot injection type fuel injection systems thereby facilitating precise control over the initiation of the pilot injection by the precise control of the end of the preceding main injection illustrated as t2 in Figures 6b and 6c.
- the control valve assembly comprises a housing having a control valve disposed in a control valve chamber.
- the control valve includes a piston valve body axially movable over a motion displacement interval between first and second positions within the control valve chamber.
- the motion displacement interval is defined by first and second sub-intervals that are each bounded on one end by the first and second positions, respectively.
- the piston valve body includes a piston valve body seat. The piston valve body seat contacts a pump body seating surface whenever the piston valve body is in the first position.
- a valve stop is disposed in the housing adjacent the control valve chamber.
- the piston valve body seat contacts the valve stop whenever the piston valve body is in the second position.
- a first control valve spring resiliently biases the piston valve body toward the second position whenever the piston valve body is in the first sub-interval.
- a second control valve spring resiliently biases the piston valve body into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.
- control valve assembly includes means for actuating the control valve, such as an electromagnetic actuator or solenoid.
- the piston valve body is urged toward an actuated position whenever the control valve is in an actuated state.
- the actuated position can be either the first or second position, and an unactuated position is the other of the first and second positions.
- the first control valve spring resiliently biases the piston valve body toward the unactuated position whenever the piston valve body is in the first sub-interval.
- the second control valve spring resiliently biases the piston valve body into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.
- first and second control valve springs in accordance with the present invention.
- first control valve spring could alternatively be configured to resiliently bias the piston valve body toward the second position when the piston valve body is in the second sub-interval, in addition to whenever the piston valve body is in the first sub-interval.
- the second control valve spring could be configured to resiliently bias the piston valve body toward the first position when the piston valve body is in the second sub-interval, or alternatively, the second control valve spring could be configured to resiliently bias the piston valve body toward the second position when the piston valve body is in the second sub-interval.
- the direction which the second control valve spring biases the piston valve body, for a particular configuration is determined accordingly so as to bring the piston valve body into damped engagement with the valve stop.
- the second control valve spring resiliently biases the piston valve body into damped engagement with the valve stop when the piston valve body is in the first sub-interval, in addition to whenever the piston valve body is in the second sub-interval.
- the control valve assembly of the present invention has many useful applications.
- One such application is to use the control valve assembly in a fuel pump or fuel injector for a fuel injection system for an internal combustion engine.
- a pump constructed according to the present invention, comprises a pump body having a pumping chamber, a fuel inlet for supplying fuel to the pumping chamber, an output port, and a control valve chamber between the pumping chamber and the outlet port.
- a reciprocating plunger is disposed in the pumping chamber. The plunger is reciprocatable over a stroke range between an extended position and a retracted position. A plunger spring resiliently biases the plunger to the retracted position.
- the pump further comprises an actuatable control valve for controlling fuel.
- the control valve is disposed in the control valve chamber, and the control valve includes a piston valve body axially movable over a motion displacement interval between first and second positions within the control valve chamber.
- the motion displacement interval is defined by first and second sub-intervals bounded by the first and second positions, respectively.
- the piston valve body includes a piston valve body seat. The piston valve body seat contacts a pump body seating surface whenever the piston valve body is in the first position.
- the pump further comprises a stator assembly, and means for actuating the control valve, such as an electromagnetic actuator or solenoid, disposed in the stator assembly.
- the piston valve body is urged toward an actuated position whenever the control valve is in an actuated state.
- An armature is secured to the control valve, and a valve stop is disposed in the pump body adjacent the control valve chamber.
- the piston valve body seat contacts the valve stop whenever the piston valve body is in the second position.
- a first control valve spring resiliently biases the piston valve body toward the unactuated position whenever the piston valve body is in the first sub-interval.
- a second control valve spring resiliently biases the piston valve body into damped engagement with the valve stop whenever the piston valve body is in the second sub-interval.
- a stop plate secures the valve stop within the pump body.
- a stator spacer is disposed between the pump body and the stator assembly and has a central opening for receiving the armature therein.
- a plurality of fasteners mount the stator assembly and the stator spacer on the pump body.
- a piston is received in the piston valve body.
- the piston has first and second ends, and a periphery surface. The first end abuts the valve stop; the second end abuts an end of the second control valve spring.
- the second control valve spring is received in the piston valve body.
- the piston has a flow passage in the form of a slot, or plurality radially and/or axially sequenced ports, for accommodating fluid flow formed on the periphery surface of the piston.
- the flow passage extends from the second end toward the first end.
- the flow passage extends outboard of the piston valve body whenever the piston valve body is in the first sub-interval.
- the flow passage is enclosed by the piston valve body whenever the piston valve body is in the second sub-interval.
- a method for controlling rate of displacement of the control valve is provided.
- the electric current can be precisely controlled to cause the piston valve body movement to model the piston valve body movement for the previously described control valve assemblies.
- control valve assembly or method of the present invention can be used in pumps or injectors having either a vertical or horizontal orientated plunger.
- a pump 10 including a first embodiment of a control valve assembly made in accordance with the present invention is illustrated.
- the pump 10 has a pump body 12, and a pumping chamber 14 is enclosed by pump body 12.
- a fuel inlet 16 for supplying fuel to pump 10 is located on the periphery of pump body 12.
- Pump body 12 further has an outlet port 18, and a control valve chamber 20 between pumping chamber 14 and outlet port 18.
- Passageways 22 and 24 connect pumping chamber 14, control valve chamber 20, and outlet port 18, respectively.
- a reciprocating plunger 26 is disposed in pumping chamber 14. Plunger 26 is reciprocatable over a stroke range between an extended position indicated at A and a retracted position indicated at B. A plunger spring 28 resiliently biases plunger 26 to the retracted position B.
- a stator assembly 30 contains an electromagnetic actuator 32, such as a solenoid.
- An electromagnetically actuated control valve 34 is disposed in control valve chamber 20 for controlling fuel.
- Control valve 34 includes a piston valve body 36. Piston valve body 36 is movable between an unactuated position and an actuated position within control valve chamber 20.
- Control valve chamber 20 contains passageways 38 for fuel flow.
- An armature 40 is secured to control valve 34 by a fastener such as a screw 42.
- a valve stop 44 is disposed in pump body 12 adjacent to control valve chamber 20.
- An O-ring 46 encircles valve stop 44 to prevent fuel leakage.
- a stop plate 48 secures valve stop 44 within pump body 12.
- a stator spacer 50 having a central opening 52 for receiving armature 40 therein is disposed between pump body 12 and stator assembly 30.
- Stator spacer 50 has notches 54 for receiving a retainer 56.
- O-rings 58 seal stator spacer 50 against stator assembly 30 and pump body 12.
- Fasteners 60 mount stator assembly 30 and stator spacer 50 on pump body 12.
- Piston valve body 36 is axially movable over a motion displacement interval between first and second positions within control valve chamber 20.
- the actuated position of piston valve body 36 is one of the first and second positions, and the unactuated position is the other of the first and second positions.
- Piston valve body 36 is urged toward the actuated position whenever control valve 34 is in the actuated state.
- the motion displacement interval for piston valve body 36 is defined by first and second sub-intervals defined by the first and second positions for piston valve body 36, respectively.
- a first control valve spring 70 resiliently biases piston valve body 36 toward the unactuated position whenever piston valve body 36 is in the first sub-interval.
- a spring seat 72 and retainer 56 abut first and second ends of first control valve spring 70.
- a second control valve spring 76 resiliently biases piston valve body 36 into damped engagement with valve stop 44 whenever piston valve body 36 is in the second sub-interval.
- Valve stop 44 includes a valve stop base 78 and a valve stop head 80.
- a pin 82 retains valve stop head 80.
- Second control valve spring 76 encircles pin 82 and is held between valve stop base 78 and the valve stop head 80.
- an engagement surface 86 engages a reciprocal drive member, such as a cam 88.
- the reciprocal motion imparted to engagement surface 86 is transferred to plunger 26 in a conventional manner.
- piston valve body 36 is axially movable over the motion displacement interval between the first and second positions.
- Piston valve body 36 includes a piston valve body seat 90.
- Seat 90 contacts a pump body seating surface 91 whenever piston valve body 36 is in the first position and contacts valve stop head 80 whenever piston valve body 36 is in the second position.
- First control valve spring 70 is resiliently biasing the piston valve body 36 toward the unactuated position whenever piston valve body 36 is in the first sub-interval of the motion displacement interval.
- Second control valve spring 76 resiliently biases piston valve body 36 toward either the first position or the second position so as to resiliently bias piston valve body 36 into damped engagement with valve stop 44 whenever piston valve body 36 is in the second sub-interval of the motion displacement interval.
- first control valve spring 70 resiliently biases piston valve body 36 toward the unactuated position, that is, toward valve stop head 80.
- Second control valve spring 76 resiliently biases piston valve body 36 to slow and dampen the engagement of piston valve body 36 with valve stop head 80.
- a pump body 92 has a fuel inlet 94, a control valve chamber 96, and passageways 98 and 100 for fuel flow.
- a control valve 102 having a piston valve body 104 is disposed in control valve chamber 96. Passageways 106 are provided for fuel flow.
- An armature 108 is secured to control valve 102 by a fastener, such as a screw 110.
- a valve stop 112 is disposed in pump body 92 adjacent control valve chamber 96. Piston valve body 104 contacts valve stop 112 whenever piston valve body 104 is in the second position, as shown in the lower half of Figure 3.
- An O-ring 114 encircles valve stop 112.
- a stop plate 116 secures valve stop 112 within pump body 92.
- a stator spacer 118 has a central opening 120 for receiving armature 108 therein.
- Stator spacer 118 has notches 122 for receiving a retainer 124.
- O-rings 126 seal stator spacer 118 against pump body 92 and stator assembly 30.
- a first control valve spring 128 resiliently biases piston valve body 104 toward valve stop 112.
- a seat 130 is provided for first control valve spring 128.
- Second control valve spring 132 is concentrically disposed with first spring 128 and resiliently biases piston valve body 104 toward valve stop 112. Second control valve spring 132 is provided with a seat 134 on the control valve 102.
- the second position for piston valve body 104 is the unactuated position.
- the first control valve spring 128 resiliently biases piston valve body 104 toward the unactuated position, that is, toward valve stop 112.
- Seat 130 is shaped so that first control valve spring 128 biases piston valve body 104 whenever piston valve body 104 is in the first sub-interval.
- the second control valve spring 132 resiliently biases piston valve body 104 toward valve stop 112 to slow and dampen the engagement of piston valve body 104 with valve stop 112.
- Seat 134 is shaped so that the second control valve spring 132 always biases piston valve body 104 in the first and second sub-intervals.
- a pump body 140 has a control valve chamber 142, and passageways 144 and 146.
- a control valve 148 having a piston valve body 150 is disposed in control valve chamber 142. Passageways 152 are provided for fluid flow.
- a valve stop 156 is disposed in pump body 140 adjacent control valve chamber 142.
- An O-ring 158 encircles valve stop 156.
- a stop plate 160 secures valve stop 156 within pump body 140.
- a second control valve spring 162 is disposed within piston valve body 150. Second control valve spring 162 has a seat 164.
- the flow passage may be provided by boring the piston 154 from one end only and provided radial directed flow passages 165 in fluid communication with the bore 163.
- a pump body 170 has a control valve chamber 172, and passageways 174 and 176.
- a control valve 178 having a piston valve body 180 is disposed in control valve chamber 172. Passageways 182 are provided for fluid flow.
- a cylindrical valve stop 184 is disposed in pump body 170.
- An O-ring 186 encircles valve stop 184.
- a stop plate 188 secures valve stop 184 within pump body 170.
- Passageway 190 is provided in valve stop 184 for fluid flow.
- a second control valve spring 192 is provided for dampening the engagement of piston valve body 180 with valve stop 184.
- a seat 194 abuts an end of second control valve spring 192.
- Pump 10 Operation of pump 10 will now be described with reference to Figure 1. Fuel is received from a fuel supply by fuel inlet 16. The cam 88 drives engagement surface 86. Plunger 26 is moved from the retracted position B to the extended position A, and fuel is pressurized within pumping chamber 14.
- Control valve 34 is controlled by electromagnetic actuator 32, and allows pressurized fuel to be directed through outlet port 18 by way of passageways 22 and 24.
- FIG. 6a there is shown a graph of piston valve body displacement versus time during operation of the control valve assembly according to a method of the prior art.
- the piston valve body seat contacts the pump body seating surface.
- the piston valve body seat contacts the valve stop.
- the solenoid current is discontinued and the piston valve body is urged from the full closed position toward the full open position, initially contacting valve stop at time t 2 , experiencing thereafter some degree of bounce off the valve stop in cyclic diminishing fashion as shown.
- the second control valve spring comes into play, either exclusively as shown in Figure 6b or jointly with the first valve spring, as shown in Figure 6c, thereby urging the piston valve body into a delayed, damped engagement with the valve stop.
- valve "bounce" is observed as the piston valve body settles into engagement with the valve stop.
- the mechanical control valve assembly can be modeled electrically. Further, damping of the control valve at one or both ends of its stroke is controlled electronically by adjusting current levels to the control valve armature coil and the one of this control technique particularly in pilot injection type fuel injection systems thereby facilitating precise control over the initiation of the pilot injection by the precise control of the end of the preceding main injection illustrated as t 2 in Figures 6b and 6c.
- the piston valve body In the first sub-interval, the piston valve body is held in the first position either by the first control valve spring or the induced force from the electromagnetic actuator. If the piston valve body is held in the first position by the first control valve spring, then by actuation of the electromagnetic actuator, the piston valve body is urged toward the second position. If the piston valve body is held in the first position by the induced force from the electromagnetic actuator, then the piston valve body is urged toward the second position by the first control valve spring upon deactuation. As the piston valve body approaches the second position in either one of the previously described manners, the piston valve body moves through the first sub-interval.
- the piston valve body Upon entering the second sub-interval, the piston valve body is in close proximity with the valve stop.
- the second control valve spring being configured to apply force in the appropriate direction to bring the piston valve body into dleayed engagement with the valve stop, resiliently biases the piston valve body.
- the control valve assembly can be provided with the piston-auxiliary fuel flow arrangement, or further controlled electrically.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Claims (21)
- Pompe (10) pour un système d'injection de carburant, la pompe comprenant :un corps de pompe (12) ayant une chambre de pompage (14), une entrée de carburant (16) pour amener le carburant à la dite chambre de pompage (14), un orifice de sortie (18) et une chambre de soupape de commande entre la dite chambre de pompage (20) et le dit orifice de sortie (18) ;un plongeur à mouvement alternatif (26) disposé dans la dite chambre de pompage (20), le dit plongeur (26) étant déplaçable en va-et-vient dans une course entre une position d'extension (A) et une position rétractée (B) ;un ressort de plongeur (28) pour rappeler élastiquement le dit plongeur (26) à la position rétractée (B) ;une soupape de commande actionnable (34) pour commander le carburant, la dite soupape de commande (34) étant disposée dans la dite chambre de soupape de commande (20), et la dite soupape de commande (34) incluant un corps de soupape à piston (36) axialement déplaçable dans un intervalle de mouvement entre une première et une deuxième positions à l'intérieur de la dite chambre de soupape de commande (20), le dit intervalle de mouvement étant défini par un premier et un deuxième sous-intervalle délimités par les dites première et deuxième positions, respectivement ;un ensemble de stator (30) ;un actionneur électromagnétique (32) pour actionner la dite soupape de commande (34), le dit actionneur électromagnétique (32) étant disposé dans le dit ensemble de stator (30), dans lequel le dit corps de soupape à piston (36) est poussé vers une position actionnée chaque fois que la dite soupape de commande (34) est dans un état actionné, la dite position actionnée étant une des dites première et deuxième positions et une position non actionnée étant l'autre des dites première et deuxième positions ;une armature (108) fixée à la dite soupape de commande (34);une butée de soupape (44) disposée dans le dit corps de pompe (12) près de la dite chambre de soupape de commande (20), le dit corps de soupape à piston (36) venant en contact avec la dite butée de soupape (44) chaque fois que le dit corps de soupape à piston (36) est dans la dite deuxième position ;un premier ressort de soupape de commande (70) pour rappeler élastiquement le dit corps de soupape à piston (36) vers la dite position non actionnée chaque fois que le dit corps de soupape à piston (36) se trouve dans le dit premier sous-intervalle ; etune plaque de butée fixant la dite butée de soupape (44) à l'intérieur du dit corps de pompe (12) ;un deuxième ressort de soupape de commande (76) pour rappeler élastiquement le dit corps de soupape à piston (36) en contact amorti avec la dite butée de soupape chaque fois que le dit corps de soupape à piston est dans le dit deuxième sous-intervalle ;un élément d'espacement de stator (50) disposé entre le dit corps de pompe (12) et le dit ensemble de stator (30) et ayant une ouverture centrale (52) pour recevoir la dite armature (108) dans cette dernière ; etune pluralité d'attaches (60) fixant le dit ensemble de stator (30) et le dit élément d'espacement de stator (50) sur le dit corps de pompe (12) de sorte que, lors de l'activation de la dite soupape de commande (34), le dit corps de soupape à piston (36) est poussé vers la position actionnée, contre l'action du dit premier ressort de soupape de commande (70).
- Pompe (10) selon la revendication 1, dans laquelle la dite position actionnée est la dite première position de sorte que, lors de la désactivation de la dite soupape de commande, le dit corps de soupape à piston (36) est poussé vers la dite position non actionnée et vient en contact amorti avec la dite butée de soupape (44).
- Pompe (10) selon la revendication 1, dans laquelle la dite position actionnée est la dite deuxième position de sorte que, lorsqu'on actionne la dite soupape de commande, le dit corps de soupape à piston est poussé vers la dite position actionnée et vient en contact amorti avec la dite butée de soupape (112).
- Pompe selon la revendication 1, dans laquelle le dit premier ressort de soupape de commande (70) rappelle élastiquement le dit corps de soupape à piston (36) vers la dite deuxième position lorsque le dit corps de soupape à piston (16) se trouve dans le dit deuxième sous-intervalle.
- Pompe selon la revendication 1, dans laquelle le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite première position lorsque le dit corps de soupape à piston se trouve dans le dit deuxième sous-intervalle.
- Pompe selon la revendication 1, dans laquelle le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite deuxième position lorsque le dit corps de soupape à piston se trouve dans le dit deuxième sous-intervalle.
- Pompe selon la revendication 1, dans laquelle le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston en contact amorti avec la dite butée de soupape lorsque le dit corps de soupape à piston se trouve dans le dit premier sous-intervalle.
- Pompe selon la revendication 1, dans laquelle le dit deuxième ressort de soupape de commande est encerclé par la dite butée de soupape.
- Pompe (10) selon la revendication 1, comprenant en outre :un piston (154) reçu dans le dit corps de soupape à piston (150), le dit piston (154) ayant une première et une deuxième extrémités et une surface périphérique, la dite première extrémité rencontrant la dite butée de soupape (156), la dite deuxième extrémité étant en butée contre une extrémité du dit deuxième ressort de soupape de commande (162), le dit deuxième ressort de soupape de commande (162) étant reçu dans le dit corps de soupape à piston (150), le dit piston (154) ayant un passage d'écoulement (155) pour permettre l'écoulement de carburant, formé sur la surface périphérique du dit piston (154), et le dit passage d'écoulement (155) s'étendant à partir de la dite deuxième extrémité vers la dite première extrémité, le dit passage d'écoulement (155) s'étendant à l'extérieur du dit corps de soupape à piston (150) chaque fois que le dit corps de soupape à piston (150) est dans le dit premier sous-intervalle, et le dit passage d'écoulement (155) étant entouré par le dit corps de soupape à piston (150) chaque fois que le dit corps de soupape à piston (150) est dans le dit deuxième sous-intervalle de sorte que, lorsque le dit passage d'écoulement (155) est entouré par le dit corps de soupape à piston (150), l'écoulement de carburant est empêché afin d'amortir le contact du dit corps de soupape à piston (150) avec la dite butée de soupape (156).
- Dispositif de soupape de commande comprenant :un boítier ayant une chambre de soupape de commande (142) ;une soupape de commande (148) disposée dans la dite chambre de soupape de commande (142), la dite soupape de commande (148) incluant un corps de soupape à piston (150) axialement déplaçable dans un intervalle de mouvement entre une première et une deuxième positions à l'intérieur de la dite chambre de soupape de commande (142), le dit intervalle de mouvement étant défini par un premier et un deuxième sous-intervalle délimités par les dites première et deuxième positions, respectivement ;une butée de soupape (156) disposée dans le dit boítier de façon adjacente à la dite chambre de soupape de commande (142), le dit corps de soupape à piston (150) venant en contact avec la dite butée de soupape (156) chaque fois que le dit corps de soupape à piston (150) est dans la dite deuxième position ;un premier ressort de soupape de commande pour rappeler élastiquement le dit corps de soupape à piston (150) vers la dite deuxième position chaque fois que le dit corps de soupape à piston (150) est dans le dit premier sous-intervalle ;un deuxième ressort de soupape de commande (162) pour rappeler élastiquement le dit corps de soupape à piston (150) en contact amorti avec la dite butée de soupape (156) chaque fois que le dit corps de soupape à piston (150) est dans le dit deuxième sous-intervalle ;un piston (154) reçu dans le dit corps de soupape à piston (150), le dit piston (154) ayant une première et une deuxième extrémités et une surface périphérique, la dite première extrémité rencontrant la dite butée de soupape (156), la dite deuxième extrémité étant en butée contre une extrémité du dit deuxième ressort de soupape de commande (162), le dit deuxième ressort de soupape de commande (162) étant logé dans le dit corps de soupape à piston (150), le dit piston (154) ayant un passage d'écoulement (155) pour permettre l'écoulement de fluide formé sur la surface périphérique du dit piston (154), et le dit passage d'écoulement (155) s'étendant à partir de la dite deuxième extrémité vers la dite première extrémité, le dit passage (155) s'étendant à l'extérieur du dit corps de soupape à piston (150) chaque fois que le dit corps de soupape à piston (150) est dans le dit premier sous-intervalle, et le dit passage d'écoulement (155) est entouré par le dit corps de soupape à piston (150) chaque fois que le dit corps de soupape à piston (150) est dans le dit deuxième intervalle de sorte que, lorsque le dit passage d'écoulement (155) est entouré par le dit corps de soupape à piston (150), l'écoulement de fluide est empêché, ce qui amortit le contact du dit corps de soupape à piston (150) avec la dite butée de soupape (156).
- Dispositif de soupape de commande selon la revendication 10, dans lequel le premier ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite deuxième position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 10, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite première position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 10, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite deuxième position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 10, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston en contact amorti avec la dite butée de soupape lorsque le dit corps de soupape à piston est dans le dit premier sous-intervalle.
- Dispositif de soupape de commande selon la revendication 10, comprenant en outre :des moyens pour actionner la dite soupape de commande, de sorte que le dit corps de soupape à piston (150) est sollicité vers une position actionnée chaque fois que la dite soupape de commande (148) est dans un état actionné, la dite position actionnée étant une des dites première et deuxième positions, et une position non-actionnée étant l'autre des dites première et deuxième positions.
- Dispositif de soupape de commande selon la revendication 15, dans lequel la dite position actionnée est la dite première position de sorte que, lorsqu'on désactive la dite soupape de commande, le dit corps de soupape à piston (150) est poussé vers la dite position non actionnée et vient en contact amorti avec la dite butée de soupape (156).
- Dispositif de soupape de commande selon la revendication 15, dans lequel la dite position actionnée est la dite deuxième position de sorte que, lorsqu'on active la dite soupape de commande, le dit corps de soupape à piston (150) est poussé vers la dite position actionnée et vient en contact amorti avec la dite butée de soupape (156).
- Dispositif de soupape de commande selon la revendication 15, dans lequel le dit premier ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite deuxième position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 15, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite première position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 15, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston vers la dite deuxième position lorsque le dit corps de soupape à piston est dans le dit deuxième sous-intervalle.
- Dispositif de soupape de commande selon la revendication 15, dans lequel le dit deuxième ressort de soupape de commande rappelle élastiquement le dit corps de soupape à piston en contact amorti avec la dite butée de soupape lorsque le dit corps de soupape à piston est dans le dit premier sous-intervalle.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49394995A | 1995-06-23 | 1995-06-23 | |
US493949 | 1995-06-23 | ||
PCT/US1996/007246 WO1997001031A1 (fr) | 1995-06-23 | 1996-05-20 | Pompe a carburant et son procede de fonctionnement |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0834013A1 EP0834013A1 (fr) | 1998-04-08 |
EP0834013A4 EP0834013A4 (fr) | 1999-09-22 |
EP0834013B1 true EP0834013B1 (fr) | 2002-10-09 |
Family
ID=23962383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96914714A Expired - Lifetime EP0834013B1 (fr) | 1995-06-23 | 1996-05-20 | Pompe a carburant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0834013B1 (fr) |
JP (1) | JPH11508345A (fr) |
DE (1) | DE69624240T2 (fr) |
WO (1) | WO1997001031A1 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5954487A (en) * | 1995-06-23 | 1999-09-21 | Diesel Technology Company | Fuel pump control valve assembly |
GB9720003D0 (en) * | 1997-09-20 | 1997-11-19 | Lucas Ind Plc | Drive circuit |
DE19809627A1 (de) * | 1998-03-06 | 1999-09-09 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19843546A1 (de) * | 1998-09-23 | 2000-03-30 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
US6276610B1 (en) | 1998-12-11 | 2001-08-21 | Diesel Technology Company | Control valve |
US6089470A (en) * | 1999-03-10 | 2000-07-18 | Diesel Technology Company | Control valve assembly for pumps and injectors |
US6158419A (en) * | 1999-03-10 | 2000-12-12 | Diesel Technology Company | Control valve assembly for pumps and injectors |
DE19923422C2 (de) * | 1999-05-21 | 2003-05-08 | Bosch Gmbh Robert | Elektronisches Einspritzsystem |
DE19939459A1 (de) * | 1999-08-20 | 2000-11-23 | Bosch Gmbh Robert | Hydraulischer Druckerzeuger |
DE19956519B4 (de) * | 1999-11-24 | 2004-05-27 | Robert Bosch Gmbh | Vorrichtung zum Einspritzen eines Fluides mit variablem Einspritzdruck |
DE10017060B4 (de) | 2000-04-05 | 2005-05-19 | Daimlerchrysler Ag | Verfahren zum Betreiben einer Diesel-Brennkraftmaschine mit einem Pumpe-Leitung-Düse-Einspritzsystem |
US6450778B1 (en) | 2000-12-07 | 2002-09-17 | Diesel Technology Company | Pump system with high pressure restriction |
JP2013053545A (ja) * | 2011-09-02 | 2013-03-21 | Yanmar Co Ltd | 燃料噴射ポンプ |
JP6547564B2 (ja) * | 2015-09-30 | 2019-07-24 | ヤンマー株式会社 | 電磁スピル弁 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2770394A (en) * | 1954-05-04 | 1956-11-13 | Automatic Canteen Co | Method and apparatus for dispensing a measured amount of beverage ingredients |
JPS5624108B2 (fr) * | 1974-06-14 | 1981-06-04 | ||
DE3128975A1 (de) | 1981-07-22 | 1983-02-10 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe |
US4569641A (en) * | 1982-09-07 | 1986-02-11 | Greatbatch Enterprises, Inc. | Low power electromagnetic pump |
DE3302294A1 (de) * | 1983-01-25 | 1984-07-26 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Kraftstoffeinspritzvorrichtung fuer luftverdichtende, selbstzuendende brennkraftmaschinen |
US4618095A (en) | 1985-07-02 | 1986-10-21 | General Motors Corporation | Electromagnetic unit fuel injector with port assist spilldown |
DE3601710C2 (de) * | 1986-01-22 | 1998-07-02 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
GB8829902D0 (en) * | 1988-12-22 | 1989-02-15 | Lucas Ind Plc | Control circuit |
DE4020951A1 (de) * | 1990-06-30 | 1992-01-02 | Bosch Gmbh Robert | Magnetventil |
GB9422742D0 (en) * | 1994-11-11 | 1995-01-04 | Lucas Ind Plc | Drive circuit |
-
1996
- 1996-05-20 WO PCT/US1996/007246 patent/WO1997001031A1/fr active IP Right Grant
- 1996-05-20 DE DE69624240T patent/DE69624240T2/de not_active Expired - Fee Related
- 1996-05-20 EP EP96914714A patent/EP0834013B1/fr not_active Expired - Lifetime
- 1996-05-20 JP JP9503837A patent/JPH11508345A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
WO1997001031A1 (fr) | 1997-01-09 |
DE69624240D1 (de) | 2002-11-14 |
EP0834013A1 (fr) | 1998-04-08 |
JPH11508345A (ja) | 1999-07-21 |
DE69624240T2 (de) | 2003-06-18 |
EP0834013A4 (fr) | 1999-09-22 |
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