US20150300338A1 - Pump for Supplying High-Pressure Fuel - Google Patents
Pump for Supplying High-Pressure Fuel Download PDFInfo
- Publication number
- US20150300338A1 US20150300338A1 US14/439,419 US201314439419A US2015300338A1 US 20150300338 A1 US20150300338 A1 US 20150300338A1 US 201314439419 A US201314439419 A US 201314439419A US 2015300338 A1 US2015300338 A1 US 2015300338A1
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- United States
- Prior art keywords
- cylinder
- plunger
- pressure fuel
- pump
- supplying high
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- 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.)
- Abandoned
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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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/20—Other positive-displacement pumps
- F04B19/22—Other positive-displacement pumps of reciprocating-piston type
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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
- F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0421—Cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0448—Sealing means, e.g. for shafts or housings
Definitions
- the present invention relates to a pump for supplying high-pressure fuel which supplies a fuel at high-pressure to an internal combustion engine.
- a plunger reciprocates to pressurize the fuel in the pressurizing chamber, and therefore the inner wall face of the cylinder which guides the reciprocating movement of the plunger and the external wall face of the plunger serve as sliding portions.
- Patent Literature 1 a cylinder which is formed by a separate component from a body is provided as a wall for guiding the plunger.
- the patent document discloses a method for fixing the cylinder by pressing the cylinder into the body, forming a low-pressure fuel portion on the outer periphery of the sliding portion which slides against the plunger and cooling the sliding portion.
- Patent Literature 2 discloses a method for fixing the cylinder which is formed as a separate member from the body by holding the cylinder between the body and a holder member.
- the cylinder which guides the reciprocating movement of the plunger When the cylinder which guides the reciprocating movement of the plunger is formed as a separate member from the body, it is necessary to secure this cylinder to the body.
- the cylinder When an external force is applied from the outside to the outer peripheral side face of the cylinder, the cylinder may be deformed and part or all of the inner peripheral side face (inner wall face) of the cylinder may contract. Since the cylinder guides the reciprocating movement of the plunger, it is necessary that the inner peripheral surface of the cylinder and the outer peripheral surface of the plunger form a sliding portion, ensuring a predetermined gap (clearance). If this gap is too large, fuel leakage from the pressurizing chamber increases and prevents sufficient pressurization, while too small a gap causes excessive frictional resistance in the sliding portion. Therefore, the gap in the sliding portion must be precisely managed.
- the external force applied from the outside to the cylinder occurs, for example, when the cylinder is pressed into the body in fixing the cylinder. Further, the pressure generated by the fuel pressurized in the pressurizing chamber acts on the outer periphery of the cylinder, and acts as an external force which contracts part or all of the inner diameter of the cylinder.
- An object of the present invention is to propose a structure which is capable of suppressing deformation of the sliding portion, and to provide a highly reliable high-pressure fuel pump.
- the invention is a pump for supplying high-pressure fuel including a plunger for pressurizing a fuel in a pressurizing chamber, a cylinder which guides the reciprocating movement of the plunger on an inner peripheral side face thereof, a body on which the cylinder is arranged, and a holder member which fixes the cylinder to the body by urging the cylinder in the axial direction, characterized in that a sealing portion is formed by pressing an end of the cylinder on the pressurizing chamber side against the body.
- a sealing portion formed by press-fitting the cylinder and the body prevents the fuel pressurized in the pressurizing chamber from leaking to the outer peripheral side face of the cylinder, and therefore the pressure of the pressurized fuel in the outer peripheral side face of the cylinder does not act as an external force to tighten the cylinder. Further, since the cylinder is fixed to the body by the holder member, an external force to tighten the cylinder when the cylinder is pressed into the body does not work. Therefore, the deformation of the inner peripheral side face of the cylinder, which is a sliding portion between the cylinder and the plunger, can be suppressed, and the reliability of the pump for supplying high-pressure fuel can be increased.
- FIG. 1 shows the overall constitution of a system for carrying out first to third embodiments.
- FIG. 2 shows a cross-sectional view of components around the cylinder (at top dead center) according to the first embodiment of the present invention.
- FIG. 3 shows a cross-sectional view of components around the cylinder (at top dead center) according to the second embodiment of the present invention.
- FIG. 4 shows a cross-sectional view of components around the cylinder (at top dead center) according to the second embodiment of the present invention.
- FIG. 5 shows a cross-sectional view of components around the cylinder (at top dead center) according to the third embodiment of the present invention.
- FIG. 6 shows a cross-sectional view of components around the cylinder (at top dead center) according to the third embodiment of the present invention.
- FIG. 1 shows the overall constitution of a system for carrying out first to third embodiments.
- a pump for supplying high-pressure fuel integrally incorporates a plurality of parts and mechanisms in a body 1 , and is attached to a cylinder head 20 of an internal combustion engine.
- a fuel suction passage 10 In the body 1 , a fuel suction passage 10 , a pressurizing chamber 11 , and a fuel discharge passage 12 are formed.
- an electromagnetic valve 5 and a discharge valve 8 are provided, and the discharge valve 8 serves as a check valve to restrict the flow direction of the fuel.
- a plunger 2 is slidably inserted into a cylinder 120 , and a retainer 3 is attached to the lower end of the same.
- the urging force of a return spring 4 acts on the retainer 3 in the downward direction in FIG. 1 .
- a tappet 6 reciprocates in the vertical direction in FIG. 1 by the rotation of a cam 7 of the internal combustion engine.
- the plunger 2 is displaced following the tappet 6 , which changes the capacity of the pressurizing chamber 11 to allow pumping action.
- the electromagnetic valve 5 is held by the body 1 , and an electromagnetic coil 500 , an anchor 503 , an anchor spring 502 , and a valve spring 504 are disposed thereon.
- An urging force of the anchor spring 502 acts on a valve body 501 in the valve opening direction via the anchor 503
- the urging force of the valve spring 504 also acts in the direction of closing the valve.
- the urging force of the anchor spring 502 is greater than that of the valve spring 504 , when the electromagnetic coil 500 is turned off (not energized), the valve body 501 is in an open state.
- This system of the electromagnetic valve will be referred to as a normal open system since it is in the open state when the electromagnetic coil is turn off and is in the closed state when the coil is turned on.
- the first to third embodiments can be similarly carried out based on a system using an electromagnetic valve system referred to as a normal closed system in which the operation is reversed, that is, the valve body 501 is in the closed state when the electromagnetic coil 500 is turned off (not energized).
- valve body 501 and the anchor 503 are separate bodies, but the first to third embodiments can be similarly carried out based on the case where the components are integrally formed.
- An injector 54 and a pressure sensor 56 are mounted on a common rail 53 .
- the injector 54 is amounted to suit the number of cylinders of the engine, and injects fuel at the signals from an engine control unit (ECU 40 ).
- ECU 40 engine control unit
- suction stroke The state in which the plunger 2 is displaced downwardly in FIG. 1 by the rotation of the cam 7 of the internal combustion engine is referred to as a suction stroke, while the state in which the plunger is displaced upwardly is referred to as a compression stroke.
- suction stroke the capacity of the pressurizing chamber 11 increases, and the fuel pressure therein is reduced.
- this stroke when the fuel pressure in the pressurizing chamber 11 becomes lower than that in the low-pressure passage 9 , the valve body 501 opens, and fuel is drawn into the pressurizing chamber.
- the electromagnetic coil 500 When the electromagnetic coil 500 is energized in the return stroke, the magnetic attraction acts on the anchor 503 , and the anchor 503 moves in the closing direction by overcoming the urging force of the spring anchor 502 . Then, the valve 501 is closed by the urging force of the valve spring 504 and the difference in the fluid pressure of the returning fuel. Then, immediately thereafter, the fuel pressure in the pressurizing chamber 11 is increases as the plunger 2 elevates. The discharge valve 8 opens automatically accordingly, and the fuel is pumped to the common rail 53 .
- the flow rate of discharge of the pump can be controlled by adjusting the timing for the electromagnetic coil 500 to be turned on.
- FIG. 2 shows a cross-sectional view of components around the cylinder 120 according to the first embodiment of the present invention. It also shows the case where the plunger 2 is positioned at the top dead center.
- 1 represents a body, 2 a plunger, 120 a cylinder, 121 a holder member, 123 a sealing member, 4 a return spring, and 3 a retainer respectively.
- the holder member 121 is coupled to the body 1 via a coupling portion 126 .
- the coupling portion 126 is formed by screw fastening, press-fitting, or welding.
- a holding unit 133 which is a part of the cylinder 120 , is urged in the direction of the body 1 by the body holder 121 , and a high-pressure sealing portion 124 is formed in the contact portion between the cylinder 120 and body 1 .
- the pressurizing chamber 11 side of the high-pressure sealing portion 124 will be defined to as a high-pressure side, while the opposite side will be defined as a low-pressure side.
- a sliding portion 125 is provided on the low-pressure side of the high-pressure sealing portion 124 in the cylinder 120 , and the plunger 2 is inserted into the cylinder 120 and supported by the sliding portion 125 .
- the cylinder is not present in the pressurizing chamber, and therefore the pressure of the high-pressure fuel does not act on the cylinder and sliding portion, and deformation thereof can be suppressed. Further, since the cylinder 120 is fixed by the urging force in the axial direction with respect to the cylinder 120 and the high-pressure sealing portion 124 is formed, the deformation of the sliding portion 125 caused by an external force in fixing can be suppressed.
- a small-diameter portion 129 and a large-diameter portion 128 are provided on the plunger 2 , and a low-pressure fuel portion 132 , of which volume increases or decreases by the reciprocating movement of the same, is formed on the outer periphery thereof.
- the low-pressure fuel portion 132 is composed of a main low-pressure fuel portion 130 in contact with the plunger 2 , and a secondary low-pressure fuel portion 127 formed on the outer periphery of the cylinder 120 , both of which are connected to each other by a fuel passage slit 131 . Further, the secondary low-pressure fuel portion 127 is connected to a damper chamber 51 by a damper chamber passage (not shown).
- the sealing member 123 is fixed to the holder member 121 , and the plunger 2 is inserted at the center of the same. Accordingly, even when the plunger 2 makes a reciprocating movement, the fuel does not leak from the low-pressure fuel portion 132 to the outside.
- the discharge pressure and the external force in fixing do not act on the outer periphery of the cylinder 120 , and therefore even when the discharge pressure is increased to a high level, deformation of the cylinder 120 and the sliding portion 125 formed therein can be prevented, and the reliability of the sliding portion 125 can be increased.
- FIG. 3 shows a cross-sectional view of components around the cylinder 120 according to the second embodiment of the present invention.
- FIG. 3 also shows the case where the plunger 2 is located at the top dead center.
- 1 represents a body, 2 a plunger, 120 a cylinder, 121 a holder member, 123 a sealing member, 4 a return spring, and 3 a retainer respectively.
- a small-diameter portion 135 and large-diameter portion 134 are provided in the cylinder 120 , and the holding portion 133 is provided in the large-diameter portion 134 .
- FIG. 3 shows, as an example, the case where the connecting portion between the small-diameter portion 135 and large-diameter portion 134 is formed by a stepped portion 122 having steps formed thereon.
- the holding portion 133 as in the first embodiment, is urged in the direction of the body 1 by a holder member 121 coupled to the body 1 by a coupling portion 126 , and a high-pressure sealing portion 124 is formed in the contact portion between the body 1 and the cylinder 120 .
- the cylinder 120 is provided with a sliding portion 125 on the low-pressure side of the high-pressure sealing portion 124 , as in the first embodiment.
- the holding portion 133 which receives the urging force can be thick for securing the strength, and the outer periphery of the sliding portion 125 on which fiction heat is generated by sliding can be thin for improving the heat dissipation. Further, when an external force in the radial direction acts on the plunger 2 , the thick sliding portion 125 is deformed in the radial direction, and therefore the effect of reducing the generated surface pressure can be expected.
- the connecting portion between the small-diameter portion 135 and large-diameter portion 134 may be formed by a tapered portion 136 in a tapered shape as in FIG. 4 , and a holding portion 133 may be formed on the tapered portion 136 .
- the holding portion 133 is urged in the direction of the body 1 by the holder member 121 .
- the tapered portion 136 is in contact with the holder member 121 , so that the cylinder 120 is automatically aligned. Therefore, more accurate positioning can be realized, and improved reliability of the sliding portion 125 can be expected.
- the holding portion is tapered, the effect that the position of the cylinder is automatically aligned can be expected, and by realizing accurate positioning, unnecessary external force is not applied to the sliding portion.
- FIG. 5 shows a cross-sectional view of components around the cylinder 120 according to the third embodiment of the present invention.
- FIG. 5 also shows the case where the plunger 2 is located at the top dead center.
- 1 represents a body, 2 a plunger, 120 a cylinder, 123 a sealing member, 4 a return spring, and 3 a retainer respectively.
- a configuration in which the sliding portion 125 is not formed on the pressurizing chamber 11 side of the high-pressure sealing portion 124 is employed.
- the cylinder 120 is prevented from entering the pressurizing chamber 11 , and the pressurizing chamber 11 can be configured to have a cylindrical shape whose inner diameter is approximately the same as that of the outer diameter of the plunger 2 .
- a minute gap with a width A is formed between the two components.
- the precompression volume which can be a cause of reduction in the volumetric efficiency (the volume of the pressurizing chamber 11 when the plunger 2 is located at the top dead center) can be reduced.
- the pressurizing chamber can be formed in a cylindrical shape whose inner diameter is approximately the same as the outer diameter of the plunger, and the discharge passage and the suction passage can be arranged freely. Consequently, when the discharge pressure is increased to a high level, the precompression volume which can be a cause of reduction in the volumetric efficiency (the volume of the pressurizing chamber when the plunger is located at the top dead center) can be reduced.
- the outer diameter of the cylinder can be highly precisely positioned by directly placing the same to the body, and the gaps in the pressurizing chamber can be further reduced. Thus, it is possible to further reduce the precompression volume.
- This configuration also employs such a positional relationship that the positions in height (in the axial direction of the plunger 2 ) of the suction passage 10 and the discharge passage 12 relative to the plunger 2 coincide with the apex of the plunger 2 at the top dead center. Accordingly, the suction passage 10 and discharge passage 12 are not interrupted by the reciprocating movement of the plunger 2 , which allows smooth suction and discharge of the fuel.
- a minute gap with a width B is formed between the outer periphery of the cylinder 120 and the inner periphery of the body 1 , and the dimensional relationship of the width A and the width B is A>B. Accordingly, since the outer periphery of the cylinder 120 and the inner periphery of the body 1 are in direct contact with each other during the assembly of the cylinder 120 , positioning with higher accuracy can be realized compared to the case of positioning through the holder member 121 , and the outer diameter of the plunger 2 and the inner diameter of the pressure chamber 11 can be more approximated to each other.
- a gap with a width C is formed between the outer periphery of the cylinder 120 and the inner periphery of the holder member 121 , and the dimensional relationship between the width B and the width C is C>B. Accordingly, the outer periphery of the cylinder 120 and the inner periphery of the holder member 121 are kept out of contact, and unnecessary external force does not act on the cylinder 120 .
- the holder member 121 is formed by two members: an urging member 121 a and a seal holder member 121 b.
- the seal holder member 121 b is fitted to the urging member 121 a, and a gap with a width D is formed between the two members.
- the dimensional relationship between the width B and the width D is preferably D>B. Accordingly, the position of the seal holder member 121 b in the radial direction aligns with that of the plunger 2 via the sealing member 123 , and therefore the axes of the two members coincide with each other, so that unnecessary external force does not act on the plunger 2 .
- a fuel passage slit 131 which connects a main low-pressure fuel portion 130 and a secondary low-pressure fuel portion 127 may be formed on the cylinder 120 side.
- FIG. 6 shows a variation of FIG. 5 .
- FIG. 6 shows the case where the plunger 2 is located at the top dead center.
- the pressurizing chamber 11 is formed by a capacity portion 11 a where the plunger 2 reciprocates, and a passage portion 11 b which connects the capacity portion 11 a to the suction passage 10 and discharge passage 12 .
- the inner diameter portion of the capacity portion 11 a is formed in a cylindrical shape whose inner diameter is approximately the same as the outer diameter of the plunger 2 . Also with this configuration, the same effects as in FIG. 5 can be achieved.
- a pump for supplying high-pressure fuel capable of improving reliability of the sliding portion at high pressures by reducing unnecessary external force acting on the sliding portion 125 , and further capable of preventing reduction in the volumetric efficiency can be realized with a small-sized and simple structure.
- a pump for supplying high-pressure fuel capable of improving reliability of the sliding portion at high pressures and further preventing a reduction of the volumetric efficiency can be realized with a small-sized and simple structure.
- the present invention can be applied not only to pumps for supplying high-pressure fuel in internal combustion engines but also widely to various high-pressure pumps.
- damper chamber 53 . . . common rail, 54 . . . injector, 56 . . . pressure sensor, 120 . . . cylinder, 121 . . . holder member, 121 a . . . urging member, 121 b . . . seal holder member, 124 . . . high-pressure sealing portion, 125 . . . sliding portion, 126 . . . coupling portion, 127 . . . secondary low-pressure fuel portion, 128 . . . large-diameter portion, 129 . . . small-diameter portion, 130 . . . main low-pressure fuel portion, 131 . . .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A small-sized and simple sliding portion structure for suppressing the deformation of a sliding portion caused by discharge pressure and the external force in fixing, and a pump for supplying high-pressure fuel having the sliding portion structure mounted thereon is provided. A plunger type pump for supplying high-pressure fuel including a cylinder which forms a sliding portion, a plunger which is slidably provided in the cylinder and reciprocates with the rotation of a cam, and a holder member which urges the cylinder against a body, has a configuration in which the cylinder is provided with a holding unit separately from the sliding portion, the holding unit is urged in the direction of the body with an urging force in the axial direction of the sliding portion to form a high-pressure sealing portion, and the cylinder has the sliding portion with the plunger on the low-pressure side than the high-pressure sealing portion.
Description
- The present invention relates to a pump for supplying high-pressure fuel which supplies a fuel at high-pressure to an internal combustion engine.
- Reduction in size, higher output, and higher efficiency of internal combustion engines have been energetically achieved these days. To this end, the pumps for supplying high-pressure fuel are strongly required to have smaller bodies to improve the mountablity into internal combustion engines, and increased flow rates and higher pressures of discharged fuel to cope with higher output and efficiency. In particular, achieving higher discharge pressure is drawing attention as one of the measures to cope with the emission requirement which grows stricter year by year.
- Various methods for forming a sliding portion of the pump for supplying high-pressure fuel have been suggested. Among them, the simplification of the structure and a reduction in production costs are significant objects. In a pump for supplying high-pressure fuel, a plunger reciprocates to pressurize the fuel in the pressurizing chamber, and therefore the inner wall face of the cylinder which guides the reciprocating movement of the plunger and the external wall face of the plunger serve as sliding portions.
- In
Patent Literature 1, a cylinder which is formed by a separate component from a body is provided as a wall for guiding the plunger. The patent document discloses a method for fixing the cylinder by pressing the cylinder into the body, forming a low-pressure fuel portion on the outer periphery of the sliding portion which slides against the plunger and cooling the sliding portion. -
Patent Literature 2 discloses a method for fixing the cylinder which is formed as a separate member from the body by holding the cylinder between the body and a holder member. - PTL 1: Japanese Unexamined Patent Publication No. 2011-231458
- PTL 2: Japanese Unexamined Patent Publication No. 2010-106741
- When the cylinder which guides the reciprocating movement of the plunger is formed as a separate member from the body, it is necessary to secure this cylinder to the body. When an external force is applied from the outside to the outer peripheral side face of the cylinder, the cylinder may be deformed and part or all of the inner peripheral side face (inner wall face) of the cylinder may contract. Since the cylinder guides the reciprocating movement of the plunger, it is necessary that the inner peripheral surface of the cylinder and the outer peripheral surface of the plunger form a sliding portion, ensuring a predetermined gap (clearance). If this gap is too large, fuel leakage from the pressurizing chamber increases and prevents sufficient pressurization, while too small a gap causes excessive frictional resistance in the sliding portion. Therefore, the gap in the sliding portion must be precisely managed.
- If part or all of the inner peripheral surface of the cylinder contracts, the clearance of the sliding portion is reduced, and the frictional resistance increases. If the plunger repeats reciprocation in the cylinder in this state, the sliding portion may generate heat, and its reliability as the pump may be lost.
- The external force applied from the outside to the cylinder occurs, for example, when the cylinder is pressed into the body in fixing the cylinder. Further, the pressure generated by the fuel pressurized in the pressurizing chamber acts on the outer periphery of the cylinder, and acts as an external force which contracts part or all of the inner diameter of the cylinder.
- An object of the present invention is to propose a structure which is capable of suppressing deformation of the sliding portion, and to provide a highly reliable high-pressure fuel pump.
- The invention is a pump for supplying high-pressure fuel including a plunger for pressurizing a fuel in a pressurizing chamber, a cylinder which guides the reciprocating movement of the plunger on an inner peripheral side face thereof, a body on which the cylinder is arranged, and a holder member which fixes the cylinder to the body by urging the cylinder in the axial direction, characterized in that a sealing portion is formed by pressing an end of the cylinder on the pressurizing chamber side against the body.
- According to the present invention configured as described above, the following effects are obtained.
- A sealing portion formed by press-fitting the cylinder and the body prevents the fuel pressurized in the pressurizing chamber from leaking to the outer peripheral side face of the cylinder, and therefore the pressure of the pressurized fuel in the outer peripheral side face of the cylinder does not act as an external force to tighten the cylinder. Further, since the cylinder is fixed to the body by the holder member, an external force to tighten the cylinder when the cylinder is pressed into the body does not work. Therefore, the deformation of the inner peripheral side face of the cylinder, which is a sliding portion between the cylinder and the plunger, can be suppressed, and the reliability of the pump for supplying high-pressure fuel can be increased.
-
FIG. 1 shows the overall constitution of a system for carrying out first to third embodiments. -
FIG. 2 shows a cross-sectional view of components around the cylinder (at top dead center) according to the first embodiment of the present invention. -
FIG. 3 shows a cross-sectional view of components around the cylinder (at top dead center) according to the second embodiment of the present invention. -
FIG. 4 shows a cross-sectional view of components around the cylinder (at top dead center) according to the second embodiment of the present invention. -
FIG. 5 shows a cross-sectional view of components around the cylinder (at top dead center) according to the third embodiment of the present invention. -
FIG. 6 shows a cross-sectional view of components around the cylinder (at top dead center) according to the third embodiment of the present invention. - Embodiments of the present invention will be described below with reference to the drawings.
-
FIG. 1 shows the overall constitution of a system for carrying out first to third embodiments. A pump for supplying high-pressure fuel integrally incorporates a plurality of parts and mechanisms in abody 1, and is attached to acylinder head 20 of an internal combustion engine. In thebody 1, afuel suction passage 10, a pressurizingchamber 11, and afuel discharge passage 12 are formed. - In the
fuel suction passage 10 andfuel discharge passage 12, anelectromagnetic valve 5 and adischarge valve 8 are provided, and thedischarge valve 8 serves as a check valve to restrict the flow direction of the fuel. - A
plunger 2 is slidably inserted into acylinder 120, and aretainer 3 is attached to the lower end of the same. The urging force of areturn spring 4 acts on theretainer 3 in the downward direction inFIG. 1 . Atappet 6 reciprocates in the vertical direction inFIG. 1 by the rotation of acam 7 of the internal combustion engine. Theplunger 2 is displaced following thetappet 6, which changes the capacity of the pressurizingchamber 11 to allow pumping action. - Further, the
electromagnetic valve 5 is held by thebody 1, and anelectromagnetic coil 500, ananchor 503, ananchor spring 502, and avalve spring 504 are disposed thereon. An urging force of theanchor spring 502 acts on avalve body 501 in the valve opening direction via theanchor 503, the urging force of thevalve spring 504 also acts in the direction of closing the valve. Herein, the urging force of theanchor spring 502 is greater than that of thevalve spring 504, when theelectromagnetic coil 500 is turned off (not energized), thevalve body 501 is in an open state. This system of the electromagnetic valve will be referred to as a normal open system since it is in the open state when the electromagnetic coil is turn off and is in the closed state when the coil is turned on. The description provided below will be based on a system using the normal open system electromagnetic valve, while on the other hand, the first to third embodiments can be similarly carried out based on a system using an electromagnetic valve system referred to as a normal closed system in which the operation is reversed, that is, thevalve body 501 is in the closed state when theelectromagnetic coil 500 is turned off (not energized). - Further, description will be provided hereinbelow based on the case where the
valve body 501 and theanchor 503 are separate bodies, but the first to third embodiments can be similarly carried out based on the case where the components are integrally formed. - An
injector 54 and apressure sensor 56 are mounted on acommon rail 53. Theinjector 54 is amounted to suit the number of cylinders of the engine, and injects fuel at the signals from an engine control unit (ECU40). - Operation in the above configuration will be described.
- The state in which the
plunger 2 is displaced downwardly inFIG. 1 by the rotation of thecam 7 of the internal combustion engine is referred to as a suction stroke, while the state in which the plunger is displaced upwardly is referred to as a compression stroke. In the suction stroke, the capacity of the pressurizingchamber 11 increases, and the fuel pressure therein is reduced. In this stroke, when the fuel pressure in the pressurizingchamber 11 becomes lower than that in the low-pressure passage 9, thevalve body 501 opens, and fuel is drawn into the pressurizing chamber. - At this time, since the urging force of the
anchor spring 504 acts on thevalve body 501 via theanchor 503, even if theplunger 2 transitions from the suction stroke to the compression stroke, thevalve body 501 still maintains the state of being open. Therefore, even in the compression stroke, the pressure in the pressurizingchamber 11 is kept as low as that in the low-pressure passage 9, and thus thedischarge valve 8 cannot be opened, so that the fuel in the quantity that is equivalent to the decrease in the capacity of the pressurizingchamber 11 is returned to adamper chamber 51 side through theelectromagnetic valve 5. This stroke will be referred to as return stroke. - When the
electromagnetic coil 500 is energized in the return stroke, the magnetic attraction acts on theanchor 503, and theanchor 503 moves in the closing direction by overcoming the urging force of thespring anchor 502. Then, thevalve 501 is closed by the urging force of thevalve spring 504 and the difference in the fluid pressure of the returning fuel. Then, immediately thereafter, the fuel pressure in the pressurizingchamber 11 is increases as theplunger 2 elevates. Thedischarge valve 8 opens automatically accordingly, and the fuel is pumped to thecommon rail 53. - By using the
electromagnetic valve 5 operating in the manner described above, the flow rate of discharge of the pump can be controlled by adjusting the timing for theelectromagnetic coil 500 to be turned on. -
FIG. 2 shows a cross-sectional view of components around thecylinder 120 according to the first embodiment of the present invention. It also shows the case where theplunger 2 is positioned at the top dead center. InFIG. 2 , 1 represents a body, 2 a plunger, 120 a cylinder, 121 a holder member, 123 a sealing member, 4 a return spring, and 3 a retainer respectively. Theholder member 121 is coupled to thebody 1 via acoupling portion 126. Thecoupling portion 126 is formed by screw fastening, press-fitting, or welding. A holdingunit 133, which is a part of thecylinder 120, is urged in the direction of thebody 1 by thebody holder 121, and a high-pressure sealing portion 124 is formed in the contact portion between thecylinder 120 andbody 1. Herein, the pressurizingchamber 11 side of the high-pressure sealing portion 124 will be defined to as a high-pressure side, while the opposite side will be defined as a low-pressure side. A slidingportion 125 is provided on the low-pressure side of the high-pressure sealing portion 124 in thecylinder 120, and theplunger 2 is inserted into thecylinder 120 and supported by the slidingportion 125. Accordingly, the cylinder is not present in the pressurizing chamber, and therefore the pressure of the high-pressure fuel does not act on the cylinder and sliding portion, and deformation thereof can be suppressed. Further, since thecylinder 120 is fixed by the urging force in the axial direction with respect to thecylinder 120 and the high-pressure sealing portion 124 is formed, the deformation of the slidingportion 125 caused by an external force in fixing can be suppressed. - Further, a small-
diameter portion 129 and a large-diameter portion 128 are provided on theplunger 2, and a low-pressure fuel portion 132, of which volume increases or decreases by the reciprocating movement of the same, is formed on the outer periphery thereof. The low-pressure fuel portion 132 is composed of a main low-pressure fuel portion 130 in contact with theplunger 2, and a secondary low-pressure fuel portion 127 formed on the outer periphery of thecylinder 120, both of which are connected to each other by a fuel passage slit 131. Further, the secondary low-pressure fuel portion 127 is connected to adamper chamber 51 by a damper chamber passage (not shown). By employing such a structure, with the reciprocation of theplunger 2, a reciprocating flow of fuel is generated between the low-pressure fuel section 132 and thedamper chamber 51. Thus, such effects that pressure pulsation of thedamper chamber 51 with the reciprocation of theplunger 2 can be reduced and that the friction heat generated at the slidingportion 125 can be dissipated into new incoming fuel can be expected. - The sealing
member 123 is fixed to theholder member 121, and theplunger 2 is inserted at the center of the same. Accordingly, even when theplunger 2 makes a reciprocating movement, the fuel does not leak from the low-pressure fuel portion 132 to the outside. - In summary, according to the present embodiment, the discharge pressure and the external force in fixing do not act on the outer periphery of the
cylinder 120, and therefore even when the discharge pressure is increased to a high level, deformation of thecylinder 120 and the slidingportion 125 formed therein can be prevented, and the reliability of the slidingportion 125 can be increased. -
FIG. 3 shows a cross-sectional view of components around thecylinder 120 according to the second embodiment of the present invention.FIG. 3 also shows the case where theplunger 2 is located at the top dead center. InFIG. 3 , 1 represents a body, 2 a plunger, 120 a cylinder, 121 a holder member, 123 a sealing member, 4 a return spring, and 3 a retainer respectively. A small-diameter portion 135 and large-diameter portion 134 are provided in thecylinder 120, and the holdingportion 133 is provided in the large-diameter portion 134.FIG. 3 shows, as an example, the case where the connecting portion between the small-diameter portion 135 and large-diameter portion 134 is formed by a steppedportion 122 having steps formed thereon. The holdingportion 133, as in the first embodiment, is urged in the direction of thebody 1 by aholder member 121 coupled to thebody 1 by acoupling portion 126, and a high-pressure sealing portion 124 is formed in the contact portion between thebody 1 and thecylinder 120. Thecylinder 120 is provided with a slidingportion 125 on the low-pressure side of the high-pressure sealing portion 124, as in the first embodiment. By providing such a configuration, the holdingportion 133 which receives the urging force can be thick for securing the strength, and the outer periphery of the slidingportion 125 on which fiction heat is generated by sliding can be thin for improving the heat dissipation. Further, when an external force in the radial direction acts on theplunger 2, the thick slidingportion 125 is deformed in the radial direction, and therefore the effect of reducing the generated surface pressure can be expected. - By setting the holding
portion 133 to have a larger diameter and the sliding portion to have a smaller diameter, both improvement in heat dissipation and suppression of deformation can be achieved. - The connecting portion between the small-
diameter portion 135 and large-diameter portion 134 may be formed by a taperedportion 136 in a tapered shape as inFIG. 4 , and a holdingportion 133 may be formed on the taperedportion 136. As in the case ofFIG. 3 , the holdingportion 133 is urged in the direction of thebody 1 by theholder member 121. At this time, the taperedportion 136 is in contact with theholder member 121, so that thecylinder 120 is automatically aligned. Therefore, more accurate positioning can be realized, and improved reliability of the slidingportion 125 can be expected. - If the holding portion is tapered, the effect that the position of the cylinder is automatically aligned can be expected, and by realizing accurate positioning, unnecessary external force is not applied to the sliding portion.
-
FIG. 5 shows a cross-sectional view of components around thecylinder 120 according to the third embodiment of the present invention.FIG. 5 also shows the case where theplunger 2 is located at the top dead center. InFIG. 5 , 1 represents a body, 2 a plunger, 120 a cylinder, 123 a sealing member, 4 a return spring, and 3 a retainer respectively. - In this embodiment, as in the first and second embodiments, a configuration in which the sliding
portion 125 is not formed on the pressurizingchamber 11 side of the high-pressure sealing portion 124 is employed. By employing such a configuration, thecylinder 120 is prevented from entering the pressurizingchamber 11, and the pressurizingchamber 11 can be configured to have a cylindrical shape whose inner diameter is approximately the same as that of the outer diameter of theplunger 2. A minute gap with a width A is formed between the two components. By employing such an inner diameter shape of the pressurizingchamber 11 which fits theplunger 2, when the discharge pressure is increased to a high level, the precompression volume which can be a cause of reduction in the volumetric efficiency (the volume of the pressurizingchamber 11 when theplunger 2 is located at the top dead center) can be reduced. - Since the cylinder does not enter the pressurizing chamber, the pressurizing chamber can be formed in a cylindrical shape whose inner diameter is approximately the same as the outer diameter of the plunger, and the discharge passage and the suction passage can be arranged freely. Consequently, when the discharge pressure is increased to a high level, the precompression volume which can be a cause of reduction in the volumetric efficiency (the volume of the pressurizing chamber when the plunger is located at the top dead center) can be reduced.
- In addition, by defining the dimensional relationship of the gaps formed between the members, the outer diameter of the cylinder can be highly precisely positioned by directly placing the same to the body, and the gaps in the pressurizing chamber can be further reduced. Thus, it is possible to further reduce the precompression volume.
- This configuration also employs such a positional relationship that the positions in height (in the axial direction of the plunger 2) of the
suction passage 10 and thedischarge passage 12 relative to theplunger 2 coincide with the apex of theplunger 2 at the top dead center. Accordingly, thesuction passage 10 anddischarge passage 12 are not interrupted by the reciprocating movement of theplunger 2, which allows smooth suction and discharge of the fuel. - In addition, a minute gap with a width B is formed between the outer periphery of the
cylinder 120 and the inner periphery of thebody 1, and the dimensional relationship of the width A and the width B is A>B. Accordingly, since the outer periphery of thecylinder 120 and the inner periphery of thebody 1 are in direct contact with each other during the assembly of thecylinder 120, positioning with higher accuracy can be realized compared to the case of positioning through theholder member 121, and the outer diameter of theplunger 2 and the inner diameter of thepressure chamber 11 can be more approximated to each other. Further, a gap with a width C is formed between the outer periphery of thecylinder 120 and the inner periphery of theholder member 121, and the dimensional relationship between the width B and the width C is C>B. Accordingly, the outer periphery of thecylinder 120 and the inner periphery of theholder member 121 are kept out of contact, and unnecessary external force does not act on thecylinder 120. - The
holder member 121 is formed by two members: an urgingmember 121 a and aseal holder member 121 b. Theseal holder member 121 b is fitted to the urgingmember 121 a, and a gap with a width D is formed between the two members. At this time, the dimensional relationship between the width B and the width D is preferably D>B. Accordingly, the position of theseal holder member 121 b in the radial direction aligns with that of theplunger 2 via the sealingmember 123, and therefore the axes of the two members coincide with each other, so that unnecessary external force does not act on theplunger 2. In addition, when theholder member 121 is formed of two members, from the perspective of securing a space, a fuel passage slit 131 which connects a main low-pressure fuel portion 130 and a secondary low-pressure fuel portion 127 may be formed on thecylinder 120 side. - Further,
FIG. 6 shows a variation ofFIG. 5 .FIG. 6 shows the case where theplunger 2 is located at the top dead center. The pressurizingchamber 11 is formed by acapacity portion 11 a where theplunger 2 reciprocates, and apassage portion 11 b which connects thecapacity portion 11 a to thesuction passage 10 anddischarge passage 12. The inner diameter portion of thecapacity portion 11 a is formed in a cylindrical shape whose inner diameter is approximately the same as the outer diameter of theplunger 2. Also with this configuration, the same effects as inFIG. 5 can be achieved. - In conclusion, according to the present embodiment, a pump for supplying high-pressure fuel capable of improving reliability of the sliding portion at high pressures by reducing unnecessary external force acting on the sliding
portion 125, and further capable of preventing reduction in the volumetric efficiency can be realized with a small-sized and simple structure. - By using the structure according to the embodiments of the present invention, a pump for supplying high-pressure fuel capable of improving reliability of the sliding portion at high pressures and further preventing a reduction of the volumetric efficiency can be realized with a small-sized and simple structure.
- The present invention can be applied not only to pumps for supplying high-pressure fuel in internal combustion engines but also widely to various high-pressure pumps.
- 1 . . . Body, 2 . . . plunger, 3 . . . retainer, 4 . . . return spring, 5 . . . electromagnetic valve, 6 . . . tappet, 7 . . . cam, 8 . . . discharge valve, 9 . . . low-pressure passage, 10 . . . fuel suction passage, 11 . . . pressurizing chamber, 11 a . . . capacity portion, 11 b . . . passage portion, 12 . . . fuel discharge passage, 20 . . . cylinder head, 40 . . . ECU, 50 . . . fuel tank, 51 . . . damper chamber, 53 . . . common rail, 54 . . . injector, 56 . . . pressure sensor, 120 . . . cylinder, 121 . . . holder member, 121 a . . . urging member, 121 b . . . seal holder member, 124 . . . high-pressure sealing portion, 125 . . . sliding portion, 126 . . . coupling portion, 127 . . . secondary low-pressure fuel portion, 128 . . . large-diameter portion, 129 . . . small-diameter portion, 130 . . . main low-pressure fuel portion, 131 . . . fuel passage slit 132 . . . low-pressure fuel portion, 133 . . . holding portion, 500 . . . electromagnetic coil, 501 . . . valve body, 502 . . . anchor spring, 503 . . . anchor, 504 . . . valve body spring,
Claims (15)
1.-11. (canceled)
12. A pump for supplying high-pressure fuel comprising a plunger which pressurizes fuel in a pressurizing chamber, a cylinder which guides the reciprocating movement of the plunger on an inner peripheral side face of the same, and a body in which the cylinder is arranged, and wherein the cylinder has an opposing face which opposes the body, and wherein the entire cylinder is disposed on the side opposite to the pressurizing chamber relative to the opposing face.
13. A pump for supplying high-pressure fuel comprising a plunger which pressurizes fuel in a pressurizing chamber, a cylinder which guides the reciprocating movement of the plunger on an inner peripheral side face of the same, and a body in which the cylinder is arranged, and wherein the cylinder has a large-diameter portion and a small-diameter portion, and wherein the large-diameter portion is disposed closer to the pressurizing chamber side than the small-diameter portion.
14. The pump for supplying high-pressure fuel according to claim 13 , wherein the large-diameter portion and the small-diameter portion are disposed on the opposite side of the pressurizing chamber relative to the body.
15. The pump for supplying high-pressure fuel according to claim 12 , wherein a sealing portion is formed by pressing the end of the cylinder on the pressurizing chamber side against the body.
16. The pump for supplying high-pressure fuel according to claim 12 , wherein a large-diameter portion and a small-diameter portion are provided in the cylinder, wherein the large-diameter portion is disposed closer to the pressurizing chamber side than the small-diameter portion, and wherein the large-diameter portion comes into contact with the body.
17. The pump for supplying high-pressure fuel according to claim 12 , wherein a large-diameter portion and a small-diameter portion are provided in the plunger, wherein a low-pressure fuel portion whose volume increases or decreases with the reciprocating movement of the plunger is formed, and
wherein the low-pressure fuel portion is located outside the inner peripheral side face in the radial direction.
18. The pump for supplying high-pressure fuel according to claim 13 , wherein a connection portion between the large-diameter portion and the small-diameter portion forms a stepped portion in a stepped form, and receives the urging force in the axial direction by the stepped portion.
19. The pump for supplying high-pressure fuel according to claim 13 , wherein the connection portion between the large-diameter portion and the small-diameter portion forms a tapered portion in a tapered form, and receives the urging force in the axial direction in the tapered portion.
20. The pump for supplying high-pressure fuel according to claim 17 , wherein a wall surface forming the low-pressure fuel portion includes both of part of the cylinder and part of the plunger.
21. The pump for supplying high-pressure fuel according to claim 12 , wherein a pressurizing chamber whose volume increases and decreases with the reciprocating movement of the plunger is formed in the body, and
wherein the pressurizing chamber is formed in a cylindrical shape having an inner diameter which is approximately equal to the outer diameter of the plunger.
22. The pump for supplying high-pressure fuel according to claim 21 , wherein a suction passage which sucks fuel into the pressurizing chamber and a discharge passage which discharges fuel from the pressurizing chamber are formed, and
wherein the position in the axial direction of the suction passage or the discharge passage relative to the plunger coincides with the apex of the plunger at the top dead point, or is located in the direction of elevation of the plunger from the apex.
23. The pump for supplying high-pressure fuel according to claim 21 , wherein the gap formed between the outer periphery of the cylinder and the body in the radial direction is smaller than the gap formed in the radial direction between the inner diameter of the pressurizing chamber and the outer diameter of the plunger.
24. The pump for supplying high-pressure fuel according to claim 23 , wherein the gap formed between the outer periphery of the cylinder and the body in the radial direction is smaller than the gap formed in the radial direction between the outer periphery of the cylinder and the inner periphery of the holder member of the cylinder.
25. The pump for supplying high-pressure fuel according to claim 12 , wherein the holder member of the cylinder is composed of two members: a seal holder member having a sealing member therein for sealing low-pressure fuel, and an urging member for urging the cylinder to the body, and
wherein the seal holder member is fitted to the urging member, and a gap is formed in the radial direction between the two members.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-239738 | 2012-10-31 | ||
JP2012239738A JP6293994B2 (en) | 2012-10-31 | 2012-10-31 | High pressure fuel supply pump |
PCT/JP2013/077409 WO2014069192A1 (en) | 2012-10-31 | 2013-10-09 | Pump for supplying high-pressure fuel |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/077409 A-371-Of-International WO2014069192A1 (en) | 2012-10-31 | 2013-10-09 | Pump for supplying high-pressure fuel |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/238,807 Continuation US10851767B2 (en) | 2012-10-31 | 2019-01-03 | Pump for supplying high-pressure fuel |
Publications (1)
Publication Number | Publication Date |
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US20150300338A1 true US20150300338A1 (en) | 2015-10-22 |
Family
ID=50627106
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/439,419 Abandoned US20150300338A1 (en) | 2012-10-31 | 2013-10-09 | Pump for Supplying High-Pressure Fuel |
US16/238,807 Active US10851767B2 (en) | 2012-10-31 | 2019-01-03 | Pump for supplying high-pressure fuel |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/238,807 Active US10851767B2 (en) | 2012-10-31 | 2019-01-03 | Pump for supplying high-pressure fuel |
Country Status (5)
Country | Link |
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US (2) | US20150300338A1 (en) |
EP (1) | EP2915995B1 (en) |
JP (1) | JP6293994B2 (en) |
CN (1) | CN104781543B (en) |
WO (1) | WO2014069192A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10330066B2 (en) | 2014-10-15 | 2019-06-25 | Continental Automotive Gmbh | High-pressure fuel pump |
US10590897B2 (en) | 2015-10-23 | 2020-03-17 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump, manufacturing method thereof, and method of bonding two members |
US11002236B2 (en) | 2016-11-18 | 2021-05-11 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump |
Families Citing this family (6)
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EP3088725B1 (en) * | 2015-04-28 | 2019-07-03 | Magneti Marelli S.p.A. | Fuel pump for a direct injection system with a reduced stress on the bushing of the piston |
DE102016201600B4 (en) * | 2016-02-03 | 2017-10-12 | Continental Automotive Gmbh | High-pressure fuel pump and fuel injection system |
CN107917028B (en) * | 2016-10-10 | 2022-01-18 | 罗伯特·博世有限公司 | Plunger type high-pressure pump and high-pressure assembly and plunger sleeve thereof |
DE102017212498A1 (en) * | 2017-07-20 | 2019-01-24 | Robert Bosch Gmbh | Piston pump, in particular high-pressure fuel pump for an internal combustion engine |
JP7139442B2 (en) * | 2018-10-19 | 2022-09-20 | 日立Astemo株式会社 | high pressure fuel pump |
CN111946580B (en) * | 2020-08-25 | 2021-04-09 | 兰州理工大学 | Digital variable hydraulic motor radial plunger pump |
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US20110303195A1 (en) * | 2010-06-10 | 2011-12-15 | Robert Lucas | Single piston pump with dual return springs |
US20120012084A1 (en) * | 2010-05-17 | 2012-01-19 | MAGNETI MARELLI S.p.A. | Fuel Pump For A Direct Injection System |
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JP5702984B2 (en) * | 2010-10-15 | 2015-04-15 | 日立オートモティブシステムズ株式会社 | High pressure fuel supply pump with electromagnetically driven suction valve |
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-
2012
- 2012-10-31 JP JP2012239738A patent/JP6293994B2/en active Active
-
2013
- 2013-10-09 EP EP13850845.2A patent/EP2915995B1/en active Active
- 2013-10-09 US US14/439,419 patent/US20150300338A1/en not_active Abandoned
- 2013-10-09 CN CN201380056341.4A patent/CN104781543B/en active Active
- 2013-10-09 WO PCT/JP2013/077409 patent/WO2014069192A1/en active Application Filing
-
2019
- 2019-01-03 US US16/238,807 patent/US10851767B2/en active Active
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US20120012084A1 (en) * | 2010-05-17 | 2012-01-19 | MAGNETI MARELLI S.p.A. | Fuel Pump For A Direct Injection System |
US20110303195A1 (en) * | 2010-06-10 | 2011-12-15 | Robert Lucas | Single piston pump with dual return springs |
Cited By (3)
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US10330066B2 (en) | 2014-10-15 | 2019-06-25 | Continental Automotive Gmbh | High-pressure fuel pump |
US10590897B2 (en) | 2015-10-23 | 2020-03-17 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump, manufacturing method thereof, and method of bonding two members |
US11002236B2 (en) | 2016-11-18 | 2021-05-11 | Hitachi Automotive Systems, Ltd. | High-pressure fuel supply pump |
Also Published As
Publication number | Publication date |
---|---|
EP2915995A4 (en) | 2016-08-10 |
CN104781543B (en) | 2018-07-03 |
EP2915995A1 (en) | 2015-09-09 |
CN104781543A (en) | 2015-07-15 |
WO2014069192A1 (en) | 2014-05-08 |
JP6293994B2 (en) | 2018-03-14 |
US20190136841A1 (en) | 2019-05-09 |
US10851767B2 (en) | 2020-12-01 |
JP2014088838A (en) | 2014-05-15 |
EP2915995B1 (en) | 2020-07-01 |
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AS | Assignment |
Owner name: HITACHI AUTOMOTIVE SYSTEMS, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARITOMI, SHUNSUKE;TOKUO, KENICHIROU;USUI, SATOSHI;AND OTHERS;SIGNING DATES FROM 20150403 TO 20150408;REEL/FRAME:035526/0652 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |