EP1657438A1 - High pressure fuel pump - Google Patents
High pressure fuel pump Download PDFInfo
- Publication number
- EP1657438A1 EP1657438A1 EP05022826A EP05022826A EP1657438A1 EP 1657438 A1 EP1657438 A1 EP 1657438A1 EP 05022826 A EP05022826 A EP 05022826A EP 05022826 A EP05022826 A EP 05022826A EP 1657438 A1 EP1657438 A1 EP 1657438A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- diameter portion
- high pressure
- housing
- pressure fuel
- 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.)
- Granted
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Classifications
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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
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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
- F04B1/0408—Pistons
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/04—Draining
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
- F04B53/162—Adaptations of cylinders
- F04B53/164—Stoffing boxes
Definitions
- the present invention relates to a high pressure fuel pump.
- Japanese Unexamined Patent Publication No. H08-68370 has a sealing means, which is engaged with an outer peripheral surface of the plunger. In this way, the outer peripheral surface of the plunger is fluid-tightly engaged with an inner peripheral surface of the sealing means to reduce leakage of fuel and leakage of lubricant oil.
- a high pressure fuel pump recited in Japanese Unexamined Patent Publication No. H11-6475 includes a sealing means that is engaged with an inner peripheral surface of the housing, which is in slidable engagement with the outer peripheral surface of the plunger. In this way, the inner peripheral surface of the housing is fluid-tightly engaged with the sealing means to reduce leakage of fuel and leakage of lubricant oil.
- the sealing means is engaged with the outer peripheral surface of the plunger or with the inner peripheral surface of the cylinder.
- the entire length of the contact area of the sealing means is lengthened. Therefore, the fuel and the oil can be easily leaked from the contact area.
- wearing of the sealing means may be induced by the engagement between the sealing means and the plunger or the housing. As a result, the durability and reliability of the sealing means is disadvantageously reduced.
- the weight of the plunger is accordingly increased. This causes an increase in inertia of the plunger at the time of reciprocal movement of the plunger. Therefore, the ability of the plunger to follow the movement of the drive means is disadvantageously reduced.
- a weight of an urging member which urges the plunger against the drive means, needs to be increased. As a result, the drive force for driving the plunger is disadvantageously increased, thereby causing a substantial increase in the size.
- a high pressure fuel pump which includes a housing, a plunger, a drive means and a sealing means.
- the housing forms a cylinder therein.
- the cylinder communicates with a fuel intake passage and a fuel delivery passage in the housing.
- the plunger is reciprocably, slidably supported in the cylinder and includes an axial end surface, a large diameter portion, a small diameter portion.
- the axial end surface of the plunger defines a pressurizing chamber in corporation with the housing, and the plunger pressurizes fuel in the pressurizing chamber.
- the large diameter portion has an outer peripheral surface, which is slidably engaged with an inner peripheral surface of the housing, which forms the cylinder.
- the small diameter portion has an outer diameter smaller than an outer diameter of the large diameter portion and is connected to an opposite axial end of the plunger, which is opposite from the pressurizing chamber and the large diameter portion.
- the drive means is for reciprocally driving the plunger.
- the drive means is arranged at the opposite axial end of the plunger, which is opposite from the pressurizing chamber.
- the sealing means has a sliding surface, which is fluid-tightly engaged with an outer peripheral surface of the small diameter portion.
- FIG. 1 shows a high pressure fuel pump according to a first embodiment of the present invention.
- the high pressure fuel pump 10 of FIG. 1 is used as a fuel pump of a gasoline engine.
- the high pressure fuel pump 10 pressurizes fuel drawn from a fuel tank and supplies the pressurized fuel to injectors (not shown).
- the high pressure fuel pump 10 controls a delivery rate of the high pressure fuel by controlling opening and closing of a solenoid valve 11.
- the high pressure fuel pump 10 includes the solenoid valve 11 and a pump arrangement 30.
- the pump arrangement 30 pressurizes the drawn fuel and discharges the pressurized fuel.
- the high pressure fuel pump 10 is not limited to the fuel pump of the gasoline engine and can be alternatively used as a supply pump, which supplies fuel to any other type of internal combustion engine, such as a diesel engine.
- the solenoid valve 11 includes a coil arrangement 12 and a valve arrangement 20.
- the coil arrangement 12 is fitted around a stationary core 21 of the valve arrangement 20.
- the coil arrangement 12 is an electromagnetic drive arrangement, which supplies drive force to the valve arrangement 20.
- the connector 13 is a resin mold, which covers a bobbin 14 and a coil 15 wound around the bobbin 14.
- a terminal 16 is electrically connected to the coil 15.
- the cover 17 is made of a metal material and connects between the stationary core 21 and a cover member 26.
- the valve arrangement 20 includes the stationary core 21, a movable core 22, a valve member 23, a valve spring 24, a valve body 25, a sleeve 253 and a stopper 254.
- the movable core 22 is reciprocably received in the cover member 26.
- the valve member 23 reciprocates together with the movable core 22.
- the valve spring 24 urges the movable core 22 in a downward direction in FIG. 1.
- the valve body 25 has a valve seat 27, against which the valve member 23 is seatable.
- the valve spring 24 urges the movable core 22 in a direction away from the stationary core 21.
- the stationary core 21 and the movable core 22 form a magnetic circuit.
- the stationary core 21 When the coil 15 is energized, the stationary core 21 generates a magnetic attractive force.
- the movable core 22 is attracted toward the stationary core 21 in an upward direction in FIG. 1 against the urging force of the valve spring 24.
- the valve body 25, the sleeve 253 and the stopper 254 are entirely received in a housing cover 31 and a housing main body 32, which form a pump housing of the pump arrangement 30.
- the housing cover 31 and the housing main body 32 form a housing of the present invention.
- the cover member 26 is fixed to the housing cover 31.
- the valve body 25 is formed into a tubular body and defines a communication hole 252 therein to communicate between a tubular internal passage 251 and a fuel intake passage 28.
- the internal passage 251 and the communication hole 252 communicate between the intake passage 28 and a pressurizing chamber 33 through a fuel hole 254a of the stopper 254.
- the valve member 23 is seated against the valve seat 27 of the valve body 25, the internal passage 251 is closed.
- the communication between the intake passage 28 and the pressurizing chamber 33 is disconnected.
- Low pressure fuel is supplied from the fuel tank to the intake passage 28 by a low pressure pump (not shown).
- the pump housing of the pump arrangement 30 includes the housing cover 31 and the housing main body 32.
- the housing cover 31 forms the intake passage 28 and is formed separately from the housing main body 32.
- the housing cover 31 covers a pressurizing chamber 33 side of the housing main body 32 and is connected to an attachment member 35 by a plurality of bolts 34.
- the housing main body 32 is clamped between the housing cover 31 and the attachment member 35 due to the connecting force of the bolts 34.
- the housing main body 32 forms a cylinder 36, in which a plunger 40 is reciprocably supported.
- the pressurizing chamber 33 is defined by an inner peripheral surface 32a of the housing main body 32, an inner peripheral surface 253a of the sleeve 253, a plunger 40 side end surface of the stopper 254 and an end surface 41 of the plunger 40.
- the inner peripheral surface 32a of the housing main body 32 forms the cylinder 36.
- a plunger spring 50 which serves as a resilient member, contacts a spring seat 51 at one end and also contacts a seat 52 at the other end.
- the spring seat 51 and a tappet guide 53 are clamped between the housing main body 32 and the attachment member 35.
- the tappet guide 53 is formed into a generally cylindrical body, and an inner peripheral surface of the tappet guide 53 is slidably engaged with an outer peripheral wall of a tappet 54. In this way, the tappet guide 53 supports the tappet 54 in an axially reciprocable manner.
- the tappet 54 has a base 541 and a tubular portion 542. The tappet 54 reciprocates in an axial direction at a location radially inward of the tappet guide 53.
- the plunger 40 has a large diameter portion 42, a small diameter portion 43, a reduced diameter portion (or a recess of any shape recessed from an outer peripheral surface of the small diameter portion) 44 and a head 45.
- the large diameter portion 42 has an outer diameter, which is larger than an outer diameter of the small diameter portion 43 and an outer diameter of the reduced diameter portion 44.
- An end surface 41 of the large diameter portion 42 which is opposite from the small diameter portion 43, defines the pressurizing chamber 33.
- An outer peripheral wall (an outer peripheral surface) 42a of the large diameter portion 42 slides along the inner peripheral surface 32a of the housing main body 32, which forms the cylinder 36.
- the outer diameter of the small diameter portion 43 is smaller than the outer diameter of the large diameter portion 42 but is larger than the outer diameter of the reduced diameter portion 44.
- the small diameter portion 43 is connected to an opposite end of the large diameter portion 42, which is opposite from the pressurizing chamber 33.
- the reduced diameter portion 44 has the smallest diameter in the plunger 40.
- the reduced diameter portion 44 is formed between the small diameter portion 43 and the head 45.
- the head 45 is connected to the reduced diameter portion 44 at the opposite end of the plunger 40, which is opposite from the pressurizing chamber 33.
- An outer diameter of the head 45 is generally the same as that of the small diameter portion 43.
- the head 45 contacts a pedestal 543, which is formed in the base 541 of the tappet 54.
- the plunger 40 is radially inwardly recessed at a location between the small diameter portion 43 and the head 45 due to the presence of the reduced diameter portion 44.
- the outer diameter of the reduced diameter portion 44 is set to be equal to or greater than 3 mm.
- the plunger 40 receives large axial force from high pressure fuel of the pressurizing chamber 33 and a drive means 60.
- the sufficient outer diameter of the plunger 40 needs to be maintained to achieve the required strength of the plunger 40. Therefore, in the present embodiment, the outer diameter of the reduced diameter portion 44, which has the smallest diameter in the plunger 40, is set to be equal to or greater than 3 mm.
- the drive means 60 includes a valve camshaft 61 of the engine and a pump cam 62, which is arranged in the valve camshaft 61.
- the pump cam 62 is rotated integrally with the valve camshaft 61.
- An outer end surface of the tappet 54 which is located on an axially outer side of the base 541, contacts the pump cam 62. In this way, when the pump cam 62 is rotated together with the valve camshaft 61, the tappet 54 is axially reciprocated in conformity with a cam profile of the pump cam 62.
- an inner end surface of the tappet 54 which is located on an axially inner side of the base 541, contacts the seat 52.
- the plunger spring 50 has an axially expanding force. In this way, the plunger spring 50, which contacts both of the spring seat 51 and the seat 52, urges the seat 52 and the tappet 54 toward the pump camshaft 62.
- An inner peripheral edge of the seat 52 is engaged with the reduced diameter portion 44 of the plunger 40.
- the plunger 40 is radially inwardly recessed due to the presence of the reduced diameter portion 44.
- the inner peripheral edge of the seat 52 is engaged with the reduced diameter portion 44, which is radially inwardly recessed in the plunger 40.
- the plunger spring 50 urges the tappet 54, which is engaged with the seat 52, toward the pump cam 62 side. Also, the plunger spring 50 urges the plunger 40 toward the pump cam 62 side through the seat 52, which is engaged with the reduced diameter portion 44.
- the plunger 40 and the tappet 54 are reciprocated in conformity with the cam profile of the pump cam 62 from a bottom dead center (also referred as a bottom dead center position) shown in FIG. 1 to a top dead center (also referred to as a top dead center position) shown in FIG. 2.
- the spring seat 51 is formed into a tubular body.
- An oil seal 70 which serves as a sealing means, is arranged on a drive means 60 side of the spring seat 51.
- the oil seal 70 is arranged on an opposite side of the housing main body 32, which is opposite from the pressurizing chamber 33 in the axial direction of the plunger 40. That is, the oil seal 70 is arranged outside of the housing main body 32.
- the oil seal 70 is formed into a tubular body, which surrounds the outer peripheral part of the plunger 40.
- the oil seal 70 includes a sealing portion 71, a supporting portion 72 and a ring 73.
- An inner peripheral sliding surface 71a of the sealing portion 71 is slidably engaged with an outer peripheral surface 43a of the small diameter portion 43 of the plunger 40.
- One axial end of the supporting portion 72 supports the sealing portion 71.
- the other axial end of the supporting portion 72 is fixed to an inner peripheral part of the spring seat 51.
- the supporting portion 72 is fixed to the spring seat 51 by, for example, press fitting, welding or the like.
- the ring 73 exerts radially inwardly clamping force and thereby radially inwardly urges the sealing portion 71.
- the sealing portion 71 is supported by the supporting portion 72 and is urged against the small diameter portion 43 of the plunger 40.
- the oil seal 70 is engaged with the small diameter portion 43 of the plunger 40.
- the sealing portion 71 is made of a resiliently deformable material, such as a rubber material or a resin material.
- An inner peripheral surface of the sealing portion 71 forms a sliding surface 71a, which is fluid tightly engaged with the outer peripheral surface 43a of the small diameter portion 43 of the plunger 40.
- the fuel which is pressurized in the pressurizing chamber 33, is partially leaked outside of the housing main body 32, specifically, to the drive means 60 side of the housing main body 32 through the sliding area between the plunger 40 and the housing main body 32.
- the leaked fuel which is leaked between the plunger 40 and the housing main body 32, lubricates between the plunger 40 and the housing main body 32.
- lubricant oil is supplied from the drive means 60 side to the tapped 54 to facilitate the sliding movement of the tappet 54 relative to the tappet guide 53.
- a space outside of the supporting portion 72 is filled with the lubricant oil
- a space inside of the supporting portion 72 is filled with the fuel.
- the sealing portion 71 is fluid tightly engaged with the small diameter portion 43 of the plunger 40, so that the oil seal 70 limits mixing of the fuel and the lubricant oil.
- the fuel which is filled in the space inside of the supporting portion 72 of the oil seal 70, is returned to, for example, the fuel tank and/or the intake passage 28 through a return passage (not shown).
- a delivery valve arrangement 80 is provided to the housing main body 32.
- the delivery valve arrangement 80 includes a casing 81.
- the housing main body 32 forms a fuel delivery passage 37, which is communicated with the pressurizing chamber 33.
- the housing main body 32 has a tubular portion 38 at radially outward of the delivery passage 37.
- the casing 81 is formed into a tubular body and receives a delivery valve 90.
- One axial end of the casing 81 is fixed to the tubular portion 38.
- the casing 81 is fixed to the housing main body 32 by, for example, thread engagement.
- the casing 81 has a receiving portion 82 and a fuel passage 83 therein. The receiving portion 82 receives the delivery valve 90.
- the delivery valve 90 is received inside of the casing 81.
- the delivery valve 90 includes a valve body 91, a valve member 92, a passage forming member 93 and a spring 94.
- the valve body 91 is formed into a tubular body and is arranged inside of the casing 81.
- a fuel passage 95 which is communicated with the delivery passage 37, is formed in the valve body 91.
- the valve member 92 is seatable against a passage forming member 93 side end of the valve body 91.
- the passage forming member 93 is arranged on an opposite side of the valve body 91, which is opposite from the housing main body 32.
- the valve member 92 is formed into a circular disk-like body and is reciprocable in the passage forming member 93 in the axial direction of the passage forming member 93.
- the spring 94 urges the valve member 92 toward the valve body 91 side.
- the valve member 92 is seated against the valve body 91, and therefore the fuel flow from the fuel passage 83 to the delivery passage 37 is stopped. That is, the delivery valve 90 serves as a check valve, which only permits the flow of the fuel from the pressurizing chamber 33 side to the outside of the high pressure fuel pump 10.
- the plunger 40 and the tappet 54 are reciprocated from the bottom dead center shown in FIG. 1 to the top dead center shown in FIG. 2 in conformity with the cam profile of the pump cam 62.
- the solenoid valve 11 is opened.
- a predetermined quantity of fuel is supplied from the intake passage 28 to the pressurizing chamber 33.
- the plunger 40 is moved from the bottom dead center to the top dead center, the fuel in the pressurizing chamber 33 is discharged into the intake passage 28.
- the solenoid valve 11 is closed.
- the fuel in the pressurizing chamber 33 is pressurized when the plunger 40 is moved upward.
- the pressure of the fuel in the delivery passage 37 is also increased.
- the delivery valve 90 is opened.
- the fuel is discharged from the pressurizing chamber 33 to the outside of the high pressure fuel pump 10.
- the oil seal 70 is engaged with the small diameter portion 43 of the plunger 40.
- the outer diameter of the large diameter portion 42 of the plunger 40 and the inner diameter of the cylinder 36 are increased, it is not required to change the diameter of the oil seal 70, which is engaged with the small diameter portion 43.
- the specification is changed to change, for example, the required delivery rate of the high pressure fuel pump 10 by changing the outer diameter of the large diameter portion 42 of the plunger 40 and the inner diameter of the cylinder 36, it is not required to change the design of the oil seal 70.
- the oil seal 70 is engaged with the small diameter portion 43 of the plunger 40.
- the outer diameter of the large diameter portion 42 of the plunger 40 is increased, an entire length of the contacting area between the plunger 40 and the oil seal 70 is not changed. Therefore, even when the diameter of the large diameter portion 42 of the plunger 40 is substantially increased, the required sealing performance for sealing between the plunger 40 and the oil seal 70 can be easily achieved. Furthermore, it is not required to apply a large force to urge the oil seal 70 against the plunger 40. Thus, the friction between the oil seal 70 and the plunger 40 is reduced, and therefore the reliability and durability thereof are improved.
- the outer diameter of the large diameter portion 42 is increased without changing the outer diameter of the small diameter portion 43.
- an increase in the entire weight of the plunger 40 is limited.
- the inertia of the plunger 40 at the time of the reciprocal movement of the plunger 40 is increased.
- the inertia of the plunger 40 becomes excessively large, the abilities of the plunger 40 and of the tappet 54 to follow the cam profile of the pump cam 62 and thereby to axially reciprocate are deteriorated.
- the urging force of the plunger spring 50 needs to be increased.
- the increase of the urging force of the plunger spring 50 causes a substantial increase in the size of the plunger spring 50.
- the size of the tappet 54 and the size the tappet guide 53 for receiving the tappet 54 are accordingly substantially increased.
- the urging force of the plunger spring 50 is increased, the required drive force of the drive means 60 for driving the plunger 40 and the tappet 54 is increased.
- the size of the drive means 60 needs to be substantially increased to achieve the required drive force.
- the entire size of the high pressure fuel pump 10 needs to be substantially increased to correspond with the increase in the outer diameter of the plunger 40.
- the outer diameter of the large diameter portion 42 is increased, an increase in the entire weight of the plunger 40 can be minimized.
- it is not required to substantially increase the size of the plunger spring 50, and therefore a substantial increase in the size of the high pressure fuel pump 10 can be limited.
- FIGS. 3-6 indicate second to fifth embodiments, respectively, of the present invention.
- components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- the shape of the oil seal is different from that of the first embodiment.
- the housing main body 32 further extends toward the drive means side in comparison to that of the first embodiment.
- a drive means 60 side end of the housing main body 32 has a receiving chamber 321, which is recessed on a pressurizing chamber 33 side thereof.
- the oil seal 170 is arranged in the receiving chamber 321 of the housing main body 32.
- the oil seal 170 includes a sealing portion 171, a supporting portion 172 and a ring 173.
- the sealing portion 171 has a sliding surface 171a, which is slidably engaged with the outer peripheral surface 43a of the small diameter portion 43 of the plunger 40.
- One end of the supporting portion 172 supports the sealing portion 171.
- the other end of the supporting portion 172 is fixed to the housing main body 32.
- the housing main body 32 and the supporting portion 172 are securely connected to each other by, for example, press fitting, welding or the like. According to the second embodiment, the total axial length of the supporting portion 172 of the oil seal 170 can be reduced.
- the shape of the oil seal is different from that of the first embodiment.
- the housing main body 32 further extends toward the drive means 60 side in comparison to that of the first embodiment.
- a drive means 60 side end of the housing main body 32 has a receiving chamber 322, which is recessed on a pressurizing chamber 33 side thereof.
- the oil seal 270 is provided in the receiving chamber 322 of the housing main body 32.
- the oil seal 270 includes a sealing portion 271 and a ring 273.
- the ring 273 is fitted into a groove 323 of the housing main body 32. In this way, the ring 273 supports the sealing portion 271 from a side that is opposite from the pressurizing chamber 33.
- the portion, which corresponds to the supporting portion of the oil seal can be omitted. As a result, the number of the components can be reduced.
- the way of installing the oils seal is different from that of the first embodiment.
- the supporting portion 72 of the oil seal 70 is installed to the housing main body 32 rather than the spring seat 51. That is, the supporting portion 72 is fixed to the outer peripheral part of the housing main body 32 by, for example, press fitting, welding or the like.
- the shape of the plunger 40 is different from that of the first embodiment.
- the large diameter portion 42 of the plunger 40 is enlarged in comparison to that of the first embodiment.
- the large diameter portion 42 of the plunger 40 may be further substantially enlarged, as shown in FIG. 6.
- the designing of the oil seal 70 is not required, and an increase in the entire length of the contact area between the plunger 40 and the oil seal 70 and an increase in the weight of the plunger 40 will not occur.
- FIG. 7 shows a high pressure fuel pump according to a sixth embodiment of the present invention.
- components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- an oil seal 370 includes a sealing portion 371 and a supporting portion 372. On end of the supporting portion 372 supports the sealing portion 371. An inner peripheral part of the sealing portion 371 forms a sliding surface 371a. The other end of the supporting portion 372, which is opposite from the sealing portion 371, includes a fixing portion 373.
- the fixing portion 373 is directly installed to the housing main body 32.
- the housing main body 32 includes a tubular portion 324, which projects toward the valve camshaft 61 side.
- the tubular portion 324 is formed into a tubular body, which is communicated with the cylinder 36.
- the fixing portion 373 is connected to the tubular portion 324.
- the fixing portion 373 is fixed to the tubular portion 324 of the housing main body 32 by, for example, press fitting, welding or the like.
- the fixing portion 373 is located on a valve camshaft 61 side of a valve camshaft 61 side end of the large diameter portion 42.
- the bottom dead center is a position where the plunger 40 is located in the closest position relative to the valve camshaft 61, and thereby the volume of the pressurizing chamber 33 is maximized.
- the fixing portion 373 is press fitted or welded to the housing main body 32.
- the tubular portion 324 of the housing main body 32 may possibly be deformed in some cases.
- the housing main body 32 is deformed, the cylinder 36, in which the plunger 40 is guided, is deformed to disturb smooth movement of the plunger 40. Therefore, in the first embodiment, the supporting portion 372 is fixed to the spring seat 51, which is formed separately from the housing main body 32. In this way, in the first embodiment, even though the spring seat 51 may be deformed due to the fixing of the supporting portion 372 to the spring seat 51, the deformation of the housing 32 can be effectively limited.
- the tubular portion 324 when the fixing portion 373 is directly fixed to the tubular portion 324 of the housing main body 32, the tubular portion 324 may possibly be slightly deformed.
- the fixing portion 373 when the plunger 40 is in the bottom dead center, the fixing portion 373 is located on the valve camshaft 61 side of the valve camshaft 61 side end of the large diameter portion 42.
- the large diameter portion 42 of the plunger 40 will not enter the radially inner side of the fixing portion 373. Therefore, only the small diameter portion 43 of the plunger 40 is moved at the radially inner side of the fixing portion 373.
- the oil seal 370 can be directly fixed to the housing main body 32.
- a dedicated separate component such as the spring seat 51 of the first embodiment, which limits the deformation of the housing main body 32.
- many components such as the deformation limiting component for limiting the deformation of the housing main body 32 and the sealing member for sealing between such a deformation limiting component and the other component (e.g., the housing main body 32), become unnecessary. As a result, the number of components and the number of assembling steps can be reduced.
- FIGS. 8 to 10 show the high pressure fuel pumps of seventh to ninth embodiments, respectively.
- components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- an oil seal 470 includes sealing portions 471 and a holder 472.
- the sealing portions 471 are held by the holder 472.
- the holder 472 is directly fixed to the housing main body 32.
- the holder 472 is fixed to the housing main body 32 by, for example, press fitting, welding or the like.
- the sealing portions 171 are provided at two axial locations along the plunger 40.
- Each sealing member 471 may be a rubber sealing member (e.g., an O-ring or an X-ring) or a resin sealing member, which is made into a ring form.
- an oil seal 570 includes sealing portions 571 and a holder 572.
- the sealing portions 571 are held by the holder 572.
- the holder 572 is fixed to an inner peripheral part of the housing main body 32.
- the holder 572 is fixed to the housing main body 32 by, for example, press fitting, welding or the like or is held by a ring 580.
- the sealing members 571 are not limited to rubber sealing members.
- the sealing members 571 may be resin sealing members.
- an oil seal 670 includes sealing portions 671, 672, a supporting portion 673 and a holder 674.
- the sealing portion 671 is supported by the supporting portion 673, and the sealing portion 672 is held by the holder 674.
- the supporting portion 673 and the holder 674 are fixed to the inner peripheral part of the housing main body 32.
- the holder 674 is held by the housing main body 32.
- the supporting portion 673 is fixed to the housing main body 32 by, for example, press fitting, welding or the like.
- the sealing member 671 is a rubber sealing member
- the sealing member 672 is a resin sealing member. As discussed above, it is possible to have a combination of different sealing members, which are made of different materials, respectively.
- An oil seal (70) is engaged with a small diameter portion (43) of a plunger (40).
- a diameter of a large diameter portion (42) of the plunger (40) and a diameter of the cylinder (36) are increased, a modification of a design of the oil seal (70), which is engaged with the small diameter portion (43), is not required.
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- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- The present invention relates to a high pressure fuel pump.
- There is known a high pressure fuel pump, which pressurizes fuel in a pressurizing chamber by a plunger (See Japanese Unexamined Patent Publication No. 2001-295730 corresponding to US Patent Application Publication No. 2003/0103853 A1 and Japanese Unexamined Patent Publication No. H08-68370 corresponding to US Patent No. 5,567,134). In such a high pressure fuel pump, fuel leakage occurs from a side of a housing, which defines the pressurizing chamber, to a side of a drive means, which drives the plunger, and lubricant oil leakage occurs from the side of the drive means to the side of the housing. Because of this, the high pressure fuel pump recited in each of Japanese Unexamined Patent Publication No. 2001-295730 and Japanese Unexamined Patent Publication No. H08-68370 has a sealing means, which is engaged with an outer peripheral surface of the plunger. In this way, the outer peripheral surface of the plunger is fluid-tightly engaged with an inner peripheral surface of the sealing means to reduce leakage of fuel and leakage of lubricant oil. Furthermore, a high pressure fuel pump recited in Japanese Unexamined Patent Publication No. H11-6475 includes a sealing means that is engaged with an inner peripheral surface of the housing, which is in slidable engagement with the outer peripheral surface of the plunger. In this way, the inner peripheral surface of the housing is fluid-tightly engaged with the sealing means to reduce leakage of fuel and leakage of lubricant oil.
- However, in recent years, a required delivery rate of the high pressure fuel pump is increasing. Because of this, a size of the plunger and a size of the cylinder, which receives the plunger, are increasing. Therefore, in the case of the techniques recited in the above Japanese Unexamined Patent Publications, it is required to newly design a sealing means to correspond with an increase in a diameter of the plunger and an increase in a diameter of the cylinder. Therefore, a product number of the sealing means and a product number of molding dies are disadvantageously increased, and a relatively large number of steps is disadvantageously required for evaluating performance of the newly designed sealing means.
- Furthermore, the sealing means is engaged with the outer peripheral surface of the plunger or with the inner peripheral surface of the cylinder. Thus, when the diameter of the plunger or the diameter of the cylinder is substantially increased, the entire length of the contact area of the sealing means is lengthened. Therefore, the fuel and the oil can be easily leaked from the contact area. It is conceivable to increase the engaging force for engaging between the sealing means and the plunger or the housing, which forms the cylinder. However, when the engaging force is increased, wearing of the sealing means may be induced by the engagement between the sealing means and the plunger or the housing. As a result, the durability and reliability of the sealing means is disadvantageously reduced.
- Furthermore, when the diameter of the plunger is increased, the weight of the plunger is accordingly increased. This causes an increase in inertia of the plunger at the time of reciprocal movement of the plunger. Therefore, the ability of the plunger to follow the movement of the drive means is disadvantageously reduced. In order to increase the ability of the plunger to follow the movement of the drive means, a weight of an urging member, which urges the plunger against the drive means, needs to be increased. As a result, the drive force for driving the plunger is disadvantageously increased, thereby causing a substantial increase in the size.
- Accordingly, it is an objective of the present invention to provide a high pressure fuel pump, which alleviates or eliminates a need for a modification of a design of a sealing means engaged with a plunger even when a diameter of at least a portion of the plunger or a diameter of a cylinder changes. It is another objective of the present invention to provide a high pressure fuel pump, which has a relatively high sealing performance and a relatively high reliability. It is another objective of the present invention to provide a high pressure fuel pump, which limits a substantial increase in a size of the high pressure fuel pump.
- To achieve the objectives of the present invention, there is provided a high pressure fuel pump, which includes a housing, a plunger, a drive means and a sealing means. The housing forms a cylinder therein. The cylinder communicates with a fuel intake passage and a fuel delivery passage in the housing. The plunger is reciprocably, slidably supported in the cylinder and includes an axial end surface, a large diameter portion, a small diameter portion. The axial end surface of the plunger defines a pressurizing chamber in corporation with the housing, and the plunger pressurizes fuel in the pressurizing chamber. The large diameter portion has an outer peripheral surface, which is slidably engaged with an inner peripheral surface of the housing, which forms the cylinder. The small diameter portion has an outer diameter smaller than an outer diameter of the large diameter portion and is connected to an opposite axial end of the plunger, which is opposite from the pressurizing chamber and the large diameter portion. The drive means is for reciprocally driving the plunger. The drive means is arranged at the opposite axial end of the plunger, which is opposite from the pressurizing chamber. The sealing means has a sliding surface, which is fluid-tightly engaged with an outer peripheral surface of the small diameter portion.
- The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which:
- FIG. 1 is a cross sectional view of a high pressure fuel pump according to a first embodiment of the present invention;
- FIG. 2 is a cross sectional view of the high pressure fuel pump of the first embodiment of the present invention, showing a plunger in a top dead center;
- FIG. 3 is a cross sectional view of a high pressure fuel pump according to a second embodiment of the present invention;
- FIG. 4 is a cross sectional view of a high pressure fuel pump according to a third embodiment of the present invention;
- FIG. 5 is a cross sectional view of a high pressure fuel pump according to a fourth embodiment of the present invention;
- FIG. 6 is a cross sectional view of a high pressure fuel pump according to a fifth embodiment of the present invention;
- FIG. 7 is a cross sectional view of a high pressure fuel pump according to a sixth embodiment of the present invention;
- FIG. 8 is a cross sectional view of a high pressure fuel pump according to a seventh embodiment of the present invention;
- FIG. 9 is a cross sectional view of a high pressure fuel pump according to an eighth embodiment of the present invention; and
- FIG. 10 is a cross sectional view of a high pressure fuel pump according to a ninth embodiment of the present invention.
- Various embodiments of the present invention will be described with reference to the accompanying drawings.
- FIG. 1 shows a high pressure fuel pump according to a first embodiment of the present invention. The high
pressure fuel pump 10 of FIG. 1 is used as a fuel pump of a gasoline engine. The highpressure fuel pump 10 pressurizes fuel drawn from a fuel tank and supplies the pressurized fuel to injectors (not shown). The highpressure fuel pump 10 controls a delivery rate of the high pressure fuel by controlling opening and closing of asolenoid valve 11. The highpressure fuel pump 10 includes thesolenoid valve 11 and apump arrangement 30. Thepump arrangement 30 pressurizes the drawn fuel and discharges the pressurized fuel. The highpressure fuel pump 10 is not limited to the fuel pump of the gasoline engine and can be alternatively used as a supply pump, which supplies fuel to any other type of internal combustion engine, such as a diesel engine. - The
solenoid valve 11 includes acoil arrangement 12 and avalve arrangement 20. Thecoil arrangement 12 is fitted around astationary core 21 of thevalve arrangement 20. Thecoil arrangement 12 is an electromagnetic drive arrangement, which supplies drive force to thevalve arrangement 20. Theconnector 13 is a resin mold, which covers abobbin 14 and acoil 15 wound around thebobbin 14. Aterminal 16 is electrically connected to thecoil 15. Thecover 17 is made of a metal material and connects between thestationary core 21 and acover member 26. - The
valve arrangement 20 includes thestationary core 21, amovable core 22, avalve member 23, avalve spring 24, avalve body 25, asleeve 253 and astopper 254. Themovable core 22 is reciprocably received in thecover member 26. Thevalve member 23 reciprocates together with themovable core 22. Thevalve spring 24 urges themovable core 22 in a downward direction in FIG. 1. Thevalve body 25 has avalve seat 27, against which thevalve member 23 is seatable. - The
valve spring 24 urges themovable core 22 in a direction away from thestationary core 21. Thestationary core 21 and themovable core 22 form a magnetic circuit. When thecoil 15 is energized, thestationary core 21 generates a magnetic attractive force. Thus, themovable core 22 is attracted toward thestationary core 21 in an upward direction in FIG. 1 against the urging force of thevalve spring 24. Thevalve body 25, thesleeve 253 and thestopper 254 are entirely received in ahousing cover 31 and a housingmain body 32, which form a pump housing of thepump arrangement 30. Thehousing cover 31 and the housingmain body 32 form a housing of the present invention. Thecover member 26 is fixed to thehousing cover 31. - The
valve body 25 is formed into a tubular body and defines acommunication hole 252 therein to communicate between a tubularinternal passage 251 and afuel intake passage 28. Theinternal passage 251 and thecommunication hole 252 communicate between theintake passage 28 and a pressurizingchamber 33 through afuel hole 254a of thestopper 254. When thevalve member 23 is seated against thevalve seat 27 of thevalve body 25, theinternal passage 251 is closed. Thus, the communication between theintake passage 28 and the pressurizingchamber 33 is disconnected. Low pressure fuel is supplied from the fuel tank to theintake passage 28 by a low pressure pump (not shown). When the connection between theintake passage 28 and the pressurizingchamber 33 is opened and closed by thevalve portion 20, the rate of fuel delivered from the pressurizingchamber 33 to theintake passage 28 is changed. Movement of thevalve member 23 toward the pressurizingchamber 33 side is limited when thevalve member 23 contacts thestopper 254. - The pump housing of the
pump arrangement 30 includes thehousing cover 31 and the housingmain body 32. Thehousing cover 31 forms theintake passage 28 and is formed separately from the housingmain body 32. Thehousing cover 31 covers a pressurizingchamber 33 side of the housingmain body 32 and is connected to anattachment member 35 by a plurality ofbolts 34. The housingmain body 32 is clamped between thehousing cover 31 and theattachment member 35 due to the connecting force of thebolts 34. - The housing
main body 32 forms acylinder 36, in which aplunger 40 is reciprocably supported. The pressurizingchamber 33 is defined by an innerperipheral surface 32a of the housingmain body 32, an innerperipheral surface 253a of thesleeve 253, aplunger 40 side end surface of thestopper 254 and anend surface 41 of theplunger 40. Here, the innerperipheral surface 32a of the housingmain body 32 forms thecylinder 36. Aplunger spring 50, which serves as a resilient member, contacts aspring seat 51 at one end and also contacts aseat 52 at the other end. Thespring seat 51 and atappet guide 53 are clamped between the housingmain body 32 and theattachment member 35. Thetappet guide 53 is formed into a generally cylindrical body, and an inner peripheral surface of thetappet guide 53 is slidably engaged with an outer peripheral wall of atappet 54. In this way, thetappet guide 53 supports thetappet 54 in an axially reciprocable manner. Thetappet 54 has abase 541 and atubular portion 542. Thetappet 54 reciprocates in an axial direction at a location radially inward of thetappet guide 53. - The
plunger 40 has alarge diameter portion 42, asmall diameter portion 43, a reduced diameter portion (or a recess of any shape recessed from an outer peripheral surface of the small diameter portion) 44 and ahead 45. Thelarge diameter portion 42 has an outer diameter, which is larger than an outer diameter of thesmall diameter portion 43 and an outer diameter of the reduceddiameter portion 44. In theplunger 40, thelarge diameter portion 42, thesmall diameter portion 43, the reduceddiameter portion 44 and thehead 45 are formed integrally. Anend surface 41 of thelarge diameter portion 42, which is opposite from thesmall diameter portion 43, defines the pressurizingchamber 33. An outer peripheral wall (an outer peripheral surface) 42a of thelarge diameter portion 42 slides along the innerperipheral surface 32a of the housingmain body 32, which forms thecylinder 36. The outer diameter of thesmall diameter portion 43 is smaller than the outer diameter of thelarge diameter portion 42 but is larger than the outer diameter of the reduceddiameter portion 44. Thesmall diameter portion 43 is connected to an opposite end of thelarge diameter portion 42, which is opposite from the pressurizingchamber 33. The reduceddiameter portion 44 has the smallest diameter in theplunger 40. The reduceddiameter portion 44 is formed between thesmall diameter portion 43 and thehead 45. Thehead 45 is connected to the reduceddiameter portion 44 at the opposite end of theplunger 40, which is opposite from the pressurizingchamber 33. An outer diameter of thehead 45 is generally the same as that of thesmall diameter portion 43. Thehead 45 contacts apedestal 543, which is formed in thebase 541 of thetappet 54. Theplunger 40 is radially inwardly recessed at a location between thesmall diameter portion 43 and thehead 45 due to the presence of the reduceddiameter portion 44. - In the present embodiment, the outer diameter of the reduced
diameter portion 44 is set to be equal to or greater than 3 mm. Theplunger 40 receives large axial force from high pressure fuel of the pressurizingchamber 33 and a drive means 60. Thus, the sufficient outer diameter of theplunger 40 needs to be maintained to achieve the required strength of theplunger 40. Therefore, in the present embodiment, the outer diameter of the reduceddiameter portion 44, which has the smallest diameter in theplunger 40, is set to be equal to or greater than 3 mm. - The drive means 60 includes a
valve camshaft 61 of the engine and apump cam 62, which is arranged in thevalve camshaft 61. Thepump cam 62 is rotated integrally with thevalve camshaft 61. An outer end surface of thetappet 54, which is located on an axially outer side of thebase 541, contacts thepump cam 62. In this way, when thepump cam 62 is rotated together with thevalve camshaft 61, thetappet 54 is axially reciprocated in conformity with a cam profile of thepump cam 62. - In contrast, an inner end surface of the
tappet 54, which is located on an axially inner side of thebase 541, contacts theseat 52. Theplunger spring 50 has an axially expanding force. In this way, theplunger spring 50, which contacts both of thespring seat 51 and theseat 52, urges theseat 52 and thetappet 54 toward thepump camshaft 62. An inner peripheral edge of theseat 52 is engaged with the reduceddiameter portion 44 of theplunger 40. Theplunger 40 is radially inwardly recessed due to the presence of the reduceddiameter portion 44. The inner peripheral edge of theseat 52 is engaged with the reduceddiameter portion 44, which is radially inwardly recessed in theplunger 40. In this way, theplunger spring 50 urges thetappet 54, which is engaged with theseat 52, toward thepump cam 62 side. Also, theplunger spring 50 urges theplunger 40 toward thepump cam 62 side through theseat 52, which is engaged with the reduceddiameter portion 44. With above structure, theplunger 40 and thetappet 54 are reciprocated in conformity with the cam profile of thepump cam 62 from a bottom dead center (also referred as a bottom dead center position) shown in FIG. 1 to a top dead center (also referred to as a top dead center position) shown in FIG. 2. - The
spring seat 51 is formed into a tubular body. Anoil seal 70, which serves as a sealing means, is arranged on a drive means 60 side of thespring seat 51. In this way, theoil seal 70 is arranged on an opposite side of the housingmain body 32, which is opposite from the pressurizingchamber 33 in the axial direction of theplunger 40. That is, theoil seal 70 is arranged outside of the housingmain body 32. - The
oil seal 70 is formed into a tubular body, which surrounds the outer peripheral part of theplunger 40. Theoil seal 70 includes a sealingportion 71, a supportingportion 72 and aring 73. An inner peripheral slidingsurface 71a of the sealingportion 71 is slidably engaged with an outerperipheral surface 43a of thesmall diameter portion 43 of theplunger 40. One axial end of the supportingportion 72 supports the sealingportion 71. The other axial end of the supportingportion 72 is fixed to an inner peripheral part of thespring seat 51. The supportingportion 72 is fixed to thespring seat 51 by, for example, press fitting, welding or the like. Thering 73 exerts radially inwardly clamping force and thereby radially inwardly urges the sealingportion 71. In this way, the sealingportion 71 is supported by the supportingportion 72 and is urged against thesmall diameter portion 43 of theplunger 40. As shown in FIGS. 1 and 2, during the traveling period of theplunger 40 from the bottom dead center to the top dead center, theoil seal 70 is engaged with thesmall diameter portion 43 of theplunger 40. - The sealing
portion 71 is made of a resiliently deformable material, such as a rubber material or a resin material. An inner peripheral surface of the sealingportion 71 forms a slidingsurface 71a, which is fluid tightly engaged with the outerperipheral surface 43a of thesmall diameter portion 43 of theplunger 40. The fuel, which is pressurized in the pressurizingchamber 33, is partially leaked outside of the housingmain body 32, specifically, to the drive means 60 side of the housingmain body 32 through the sliding area between theplunger 40 and the housingmain body 32. The leaked fuel, which is leaked between theplunger 40 and the housingmain body 32, lubricates between theplunger 40 and the housingmain body 32. - In contrast, lubricant oil is supplied from the drive means 60 side to the tapped 54 to facilitate the sliding movement of the
tappet 54 relative to thetappet guide 53. Thus, at theoil seal 70, a space outside of the supportingportion 72 is filled with the lubricant oil, and a space inside of the supportingportion 72 is filled with the fuel. The sealingportion 71 is fluid tightly engaged with thesmall diameter portion 43 of theplunger 40, so that theoil seal 70 limits mixing of the fuel and the lubricant oil. The fuel, which is filled in the space inside of the supportingportion 72 of theoil seal 70, is returned to, for example, the fuel tank and/or theintake passage 28 through a return passage (not shown). - A
delivery valve arrangement 80 is provided to the housingmain body 32. Thedelivery valve arrangement 80 includes acasing 81. The housingmain body 32 forms afuel delivery passage 37, which is communicated with the pressurizingchamber 33. The housingmain body 32 has atubular portion 38 at radially outward of thedelivery passage 37. Thecasing 81 is formed into a tubular body and receives adelivery valve 90. One axial end of thecasing 81 is fixed to thetubular portion 38. In the present embodiment, thecasing 81 is fixed to the housingmain body 32 by, for example, thread engagement. Thecasing 81 has a receivingportion 82 and afuel passage 83 therein. The receivingportion 82 receives thedelivery valve 90. - The
delivery valve 90 is received inside of thecasing 81. Thedelivery valve 90 includes avalve body 91, avalve member 92, apassage forming member 93 and aspring 94. Thevalve body 91 is formed into a tubular body and is arranged inside of thecasing 81. Afuel passage 95, which is communicated with thedelivery passage 37, is formed in thevalve body 91. Thevalve member 92 is seatable against apassage forming member 93 side end of thevalve body 91. Thepassage forming member 93 is arranged on an opposite side of thevalve body 91, which is opposite from the housingmain body 32. Thevalve member 92 is formed into a circular disk-like body and is reciprocable in thepassage forming member 93 in the axial direction of thepassage forming member 93. Thespring 94 urges thevalve member 92 toward thevalve body 91 side. - When the pressure of the
fuel passage 95 of thevalve body 91, which is communicated with thedelivery passage 37, is increased through the pressurization of the fuel in the pressurizingchamber 33, the urging force of the fuel of thefuel passage 95, which urges thevalve member 92, is increased. Then, when the force, which is applied from the fuel of thefuel passage 95 to thevalve member 92, becomes larger than the force, which is applied from the fuel of thefuel passage 83 and thespring 94 to thevalve member 92, thevalve member 92 is lifted away from thevalve body 91. In this way, thedelivery passage 37 and thefuel passage 83 of thecasing 81 are communicated with each other, and therefore the pressurized fuel is delivered from the highpressure fuel pump 10. In contrast, when the pressure of thefuel passage 83 is higher than that of thedelivery passage 37, thevalve member 92 is seated against thevalve body 91, and therefore the fuel flow from thefuel passage 83 to thedelivery passage 37 is stopped. That is, thedelivery valve 90 serves as a check valve, which only permits the flow of the fuel from the pressurizingchamber 33 side to the outside of the highpressure fuel pump 10. - In the high
pressure fuel pump 10, theplunger 40 and thetappet 54 are reciprocated from the bottom dead center shown in FIG. 1 to the top dead center shown in FIG. 2 in conformity with the cam profile of thepump cam 62. When theplunger 40 is moved from the top dead center to the bottom dead center, thesolenoid valve 11 is opened. Thus, a predetermined quantity of fuel is supplied from theintake passage 28 to the pressurizingchamber 33. When theplunger 40 is moved from the bottom dead center to the top dead center, the fuel in the pressurizingchamber 33 is discharged into theintake passage 28. When a predetermined quantity of fuel is discharged from the pressurizingchamber 33 into theintake passage 28, thesolenoid valve 11 is closed. The fuel in the pressurizingchamber 33 is pressurized when theplunger 40 is moved upward. When the pressure of the fuel in the pressurizingchamber 33 is increased, the pressure of the fuel in thedelivery passage 37 is also increased. When the pressure of the fuel in thedelivery passage 37 becomes larger than the pressure of the fuel in thefuel passage 83, thedelivery valve 90 is opened. Thus, the fuel is discharged from the pressurizingchamber 33 to the outside of the highpressure fuel pump 10. - In the first embodiment, the
oil seal 70 is engaged with thesmall diameter portion 43 of theplunger 40. Thus, even when the outer diameter of thelarge diameter portion 42 of theplunger 40 and the inner diameter of thecylinder 36 are increased, it is not required to change the diameter of theoil seal 70, which is engaged with thesmall diameter portion 43. As a result, even when the specification is changed to change, for example, the required delivery rate of the highpressure fuel pump 10 by changing the outer diameter of thelarge diameter portion 42 of theplunger 40 and the inner diameter of thecylinder 36, it is not required to change the design of theoil seal 70. Furthermore, since it is not required to change the design of theoil seal 70 in conformity with theplunger 40, an increase in the product number of the oil seals 70 and an increase in the product number of dies for manufacturing the oil seals 70 can be limited, and the number of steps for testing the performance of the oil seals 70 can be reduced. - Furthermore, in the first embodiment, the
oil seal 70 is engaged with thesmall diameter portion 43 of theplunger 40. Thus, even when the outer diameter of thelarge diameter portion 42 of theplunger 40 is increased, an entire length of the contacting area between theplunger 40 and theoil seal 70 is not changed. Therefore, even when the diameter of thelarge diameter portion 42 of theplunger 40 is substantially increased, the required sealing performance for sealing between theplunger 40 and theoil seal 70 can be easily achieved. Furthermore, it is not required to apply a large force to urge theoil seal 70 against theplunger 40. Thus, the friction between theoil seal 70 and theplunger 40 is reduced, and therefore the reliability and durability thereof are improved. - Furthermore, according to the first embodiment, the outer diameter of the
large diameter portion 42 is increased without changing the outer diameter of thesmall diameter portion 43. Thus, even when the outer diameter of thelarge diameter portion 42 is increased, an increase in the entire weight of theplunger 40 is limited. When the weight of theplunger 40 is increased, the inertia of theplunger 40 at the time of the reciprocal movement of theplunger 40 is increased. As in the first embodiment, in the case of driving theplunger 40 by thepump cam 62, when the inertia of theplunger 40 becomes excessively large, the abilities of theplunger 40 and of thetappet 54 to follow the cam profile of thepump cam 62 and thereby to axially reciprocate are deteriorated. In order to increase the abilities of theplunger 40 and of thetappet 54 to follow the cam profile of thepump cam 62, the urging force of theplunger spring 50 needs to be increased. The increase of the urging force of theplunger spring 50 causes a substantial increase in the size of theplunger spring 50. When the size of theplunger spring 50 is substantially increased, the size of thetappet 54 and the size thetappet guide 53 for receiving thetappet 54 are accordingly substantially increased. Furthermore, when the urging force of theplunger spring 50 is increased, the required drive force of the drive means 60 for driving theplunger 40 and thetappet 54 is increased. Thus, the size of the drive means 60 needs to be substantially increased to achieve the required drive force. Therefore, the entire size of the highpressure fuel pump 10 needs to be substantially increased to correspond with the increase in the outer diameter of theplunger 40. However, according to the first embodiment, even when the outer diameter of thelarge diameter portion 42 is increased, an increase in the entire weight of theplunger 40 can be minimized. As a result, it is not required to substantially increase the size of theplunger spring 50, and therefore a substantial increase in the size of the highpressure fuel pump 10 can be limited. - FIGS. 3-6 indicate second to fifth embodiments, respectively, of the present invention. In the following description, components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- In the second embodiment, as shown in FIG. 3, the shape of the oil seal is different from that of the first embodiment. In the second embodiment, the housing
main body 32 further extends toward the drive means side in comparison to that of the first embodiment. A drive means 60 side end of the housingmain body 32 has a receivingchamber 321, which is recessed on a pressurizingchamber 33 side thereof. Theoil seal 170 is arranged in the receivingchamber 321 of the housingmain body 32. Theoil seal 170 includes a sealingportion 171, a supportingportion 172 and aring 173. The sealingportion 171 has a slidingsurface 171a, which is slidably engaged with the outerperipheral surface 43a of thesmall diameter portion 43 of theplunger 40. One end of the supportingportion 172 supports the sealingportion 171. The other end of the supportingportion 172 is fixed to the housingmain body 32. The housingmain body 32 and the supportingportion 172 are securely connected to each other by, for example, press fitting, welding or the like. According to the second embodiment, the total axial length of the supportingportion 172 of theoil seal 170 can be reduced. - In the third embodiment, as shown in FIG. 4, the shape of the oil seal is different from that of the first embodiment. In the third embodiment, the housing
main body 32 further extends toward the drive means 60 side in comparison to that of the first embodiment. A drive means 60 side end of the housingmain body 32 has a receivingchamber 322, which is recessed on a pressurizingchamber 33 side thereof. Theoil seal 270 is provided in the receivingchamber 322 of the housingmain body 32. Theoil seal 270 includes a sealingportion 271 and aring 273. Thering 273 is fitted into agroove 323 of the housingmain body 32. In this way, thering 273 supports the sealingportion 271 from a side that is opposite from the pressurizingchamber 33. According to the third embodiment, the portion, which corresponds to the supporting portion of the oil seal, can be omitted. As a result, the number of the components can be reduced. - In the fourth embodiment, as shown in FIG. 5, the way of installing the oils seal is different from that of the first embodiment. In the fourth embodiment, the supporting
portion 72 of theoil seal 70 is installed to the housingmain body 32 rather than thespring seat 51. That is, the supportingportion 72 is fixed to the outer peripheral part of the housingmain body 32 by, for example, press fitting, welding or the like. - In the fifth embodiment, as shown in FIG. 6, the shape of the
plunger 40 is different from that of the first embodiment. In the fifth embodiment, thelarge diameter portion 42 of theplunger 40 is enlarged in comparison to that of the first embodiment. When the size of theplunger 40 is substantially increased to increase the flow rate of the fuel, which is delivered from the highpressure fuel pump 10, thelarge diameter portion 42 of theplunger 40 may be further substantially enlarged, as shown in FIG. 6. In this case, in theplunger 40, only the outer diameter of thelarge diameter portion 42 is increased, and the outer diameter of thesmall diameter portion 43 is kept at the constant value. Thus, the designing of theoil seal 70 is not required, and an increase in the entire length of the contact area between theplunger 40 and theoil seal 70 and an increase in the weight of theplunger 40 will not occur. - FIG. 7 shows a high pressure fuel pump according to a sixth embodiment of the present invention. In the following description, components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- In the sixth embodiment, as shown in FIG. 7, the shape of the oil seal is different from that of the first embodiment. According to the sixth embodiment, an
oil seal 370 includes a sealingportion 371 and a supportingportion 372. On end of the supportingportion 372 supports the sealingportion 371. An inner peripheral part of the sealingportion 371 forms a slidingsurface 371a. The other end of the supportingportion 372, which is opposite from the sealingportion 371, includes a fixingportion 373. The fixingportion 373 is directly installed to the housingmain body 32. The housingmain body 32 includes atubular portion 324, which projects toward thevalve camshaft 61 side. Thetubular portion 324 is formed into a tubular body, which is communicated with thecylinder 36. The fixingportion 373 is connected to thetubular portion 324. The fixingportion 373 is fixed to thetubular portion 324 of the housingmain body 32 by, for example, press fitting, welding or the like. - When the
plunger 40 is in the bottom dead center as shown in FIG. 7, the fixingportion 373 is located on avalve camshaft 61 side of avalve camshaft 61 side end of thelarge diameter portion 42. The bottom dead center is a position where theplunger 40 is located in the closest position relative to thevalve camshaft 61, and thereby the volume of the pressurizingchamber 33 is maximized. When the position of the fixingportion 373 is set in the above manner, thelarge diameter portion 42 of theplunger 40 will not be moved beyond the fixingportion 373 on thevalve camshaft 61 side of the fixingportion 373. - In a case where the
oil seal 370 is directly fixed to the housingmain body 32, the fixingportion 373 is press fitted or welded to the housingmain body 32. When the fixingportion 373 is press fitted or is welded, thetubular portion 324 of the housingmain body 32 may possibly be deformed in some cases. When the housingmain body 32 is deformed, thecylinder 36, in which theplunger 40 is guided, is deformed to disturb smooth movement of theplunger 40. Therefore, in the first embodiment, the supportingportion 372 is fixed to thespring seat 51, which is formed separately from the housingmain body 32. In this way, in the first embodiment, even though thespring seat 51 may be deformed due to the fixing of the supportingportion 372 to thespring seat 51, the deformation of thehousing 32 can be effectively limited. - In the sixth embodiment, when the fixing
portion 373 is directly fixed to thetubular portion 324 of the housingmain body 32, thetubular portion 324 may possibly be slightly deformed. However, as discussed above, when theplunger 40 is in the bottom dead center, the fixingportion 373 is located on thevalve camshaft 61 side of thevalve camshaft 61 side end of thelarge diameter portion 42. Thus, at the time of reciprocating theplunger 40, thelarge diameter portion 42 of theplunger 40 will not enter the radially inner side of the fixingportion 373. Therefore, only thesmall diameter portion 43 of theplunger 40 is moved at the radially inner side of the fixingportion 373. As a result, even when the housingmain body 32 is deformed, the relative sliding movement between the outerperipheral wall 42a of thelarge diameter portion 42 of theplunger 40 and the innerperipheral surface 32a of thecylinder 36 will not be disturbed, and therefore the smooth reciprocal movement of theplunger 40 will not be disturbed. - Furthermore, in the sixth embodiment, the
oil seal 370 can be directly fixed to the housingmain body 32. Thus, there is no need to provide a dedicated separate component, such as thespring seat 51 of the first embodiment, which limits the deformation of the housingmain body 32. In this way, many components, such as the deformation limiting component for limiting the deformation of the housingmain body 32 and the sealing member for sealing between such a deformation limiting component and the other component (e.g., the housing main body 32), become unnecessary. As a result, the number of components and the number of assembling steps can be reduced. - FIGS. 8 to 10 show the high pressure fuel pumps of seventh to ninth embodiments, respectively. In the following description, components similar to those of the first embodiment will be indicated by the same numerals and will not be described again for the sake of simplicity.
- In the seventh embodiment, as shown in FIG. 8, an
oil seal 470 includes sealingportions 471 and aholder 472. The sealingportions 471 are held by theholder 472. Similar to the sixth embodiment, theholder 472 is directly fixed to the housingmain body 32. Theholder 472 is fixed to the housingmain body 32 by, for example, press fitting, welding or the like. The sealingportions 171 are provided at two axial locations along theplunger 40. Each sealingmember 471 may be a rubber sealing member (e.g., an O-ring or an X-ring) or a resin sealing member, which is made into a ring form. - In the eighth embodiment, as shown in FIG. 9, an
oil seal 570 includes sealingportions 571 and aholder 572. The sealingportions 571 are held by theholder 572. Theholder 572 is fixed to an inner peripheral part of the housingmain body 32. Theholder 572 is fixed to the housingmain body 32 by, for example, press fitting, welding or the like or is held by aring 580. The sealingmembers 571 are not limited to rubber sealing members. For example, the sealingmembers 571 may be resin sealing members. - In the ninth embodiment, as shown in FIG. 10, an
oil seal 670 includes sealingportions portion 673 and aholder 674. The sealingportion 671 is supported by the supportingportion 673, and the sealingportion 672 is held by theholder 674. The supportingportion 673 and theholder 674 are fixed to the inner peripheral part of the housingmain body 32. Theholder 674 is held by the housingmain body 32. The supportingportion 673 is fixed to the housingmain body 32 by, for example, press fitting, welding or the like. In the ninth embodiment, the sealingmember 671 is a rubber sealing member, and the sealingmember 672 is a resin sealing member. As discussed above, it is possible to have a combination of different sealing members, which are made of different materials, respectively. - The present invention is not limited to the above specific embodiments and can be embodied in various ways without departing from the scope of the invention.
- Additional advantages and modifications will readily occur to those skilled in the art. The invention in its broader terms is therefore not limited to the specific details, representative apparatus, and illustrative examples shown and described. Also, it should be noted that the component (s) of any one of the above embodiments may be replaced with or combined with the component(s) of any other one of the above embodiments without departing from the spirit and scope of the invention.
- An oil seal (70) is engaged with a small diameter portion (43) of a plunger (40). Thus, even when a diameter of a large diameter portion (42) of the plunger (40) and a diameter of the cylinder (36) are increased, a modification of a design of the oil seal (70), which is engaged with the small diameter portion (43), is not required.
Claims (5)
- A high pressure fuel pump comprising:a housing (31, 32) that forms a cylinder (36) therein, wherein the cylinder (36) communicates with a fuel intake passage (28) and a fuel delivery passage (37) in the housing (31, 32);a plunger (40) that is reciprocably, slidably supported in the cylinder (36) and includes:an axial end surface (41) that defines a pressurizing chamber (33) in corporation with the housing (31, 32), wherein the plunger (40) pressurizes fuel in the pressurizing chamber (33);a large diameter portion (42) that has an outer peripheral surface (42a), which is slidably engaged with an inner peripheral surface (32a) of the housing (31, 32), which forms the cylinder (36); anda small diameter portion (43) that has an outer diameter smaller than an outer diameter of the large diameter portion (42) and is connected to an opposite axial end of the plunger (40), which is opposite from the pressurizing chamber (33) and the large diameter portion (42);a drive means (60) for reciprocally driving the plunger (40), wherein the drive means (60) is arranged at the opposite axial end of the plunger (40), which is opposite from the pressurizing chamber (33); anda sealing means (70, 170, 270, 370, 470, 570, 670) that has a sliding surface, which is fluid-tightly engaged with an outer peripheral surface (43a) of the small diameter portion (43).
- The high pressure fuel pump according to claim 1, further comprising:a resilient member (50) that urges the plunger (40) toward the drive means (60) side; anda seat (52) that conducts an urging force of the resilient member (50) to the plunger (40), wherein the plunger (40) further includes a reduced diameter portion (44), which is engaged with the seat (52) and is located at an opposite end of the small diameter portion (43) that is opposite from the large diameter portion (42), and an outer diameter of the reduced diameter portion (44) is smaller than the outer diameter of the small diameter portion (43).
- The high pressure fuel pump according to claim 2, wherein the outer diameter of the reduced diameter portion (44) is equal to or greater than 3 mm.
- The high pressure fuel pump according to any one of claims 1 to 3, wherein:the sealing means (70, 170, 270, 370, 470, 570, 670) includes a fixing portion (373), which is fixed to the housing (31, 32); andthe fixing portion (373) is located closer to the drive means (60) than a drive means side end of the large diameter portion (42) when the plunger (40) is positioned in a bottom dead center.
- The high pressure fuel pump according to any one of claims 1 to 4, wherein the sealing means (70, 370, 470) is located axially outward of the housing (31, 32) on a side opposite from the pressurizing chamber (33) of the cylinder (36).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004331599 | 2004-11-16 | ||
JP2005240970A JP2006170184A (en) | 2004-11-16 | 2005-08-23 | High pressure fuel pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1657438A1 true EP1657438A1 (en) | 2006-05-17 |
EP1657438B1 EP1657438B1 (en) | 2008-09-24 |
Family
ID=35614583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05022826A Expired - Fee Related EP1657438B1 (en) | 2004-11-16 | 2005-10-19 | High pressure fuel pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060104843A1 (en) |
EP (1) | EP1657438B1 (en) |
JP (1) | JP2006170184A (en) |
DE (1) | DE602005009908D1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1707799A1 (en) * | 2005-03-30 | 2006-10-04 | Denso Corporation | Fuel pump having plunger and fuel supply system using the same |
WO2009058279A1 (en) * | 2007-10-31 | 2009-05-07 | Caterpillar Inc. | High-pressure pump |
WO2011000598A1 (en) * | 2009-06-29 | 2011-01-06 | Robert Bosch Gmbh | High pressure pump |
EP2317120A1 (en) * | 2009-11-03 | 2011-05-04 | Magneti Marelli S.p.A. | Fuel pump with reduced seal wear for a direct injection system |
WO2014135303A1 (en) * | 2013-03-07 | 2014-09-12 | Robert Bosch Gmbh | Pump, in particular fuel pump |
ITMI20131370A1 (en) * | 2013-08-08 | 2015-02-09 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
WO2015028195A1 (en) * | 2013-08-27 | 2015-03-05 | Robert Bosch Gmbh | High-pressure pump for a fuel injection system and method for producing a high-pressure pump for a fuel injection system |
WO2016062431A1 (en) * | 2014-10-21 | 2016-04-28 | Delphi International Operations Luxembourg S.À R.L. | Pumping mechanism |
DE102016115281B4 (en) * | 2015-09-18 | 2020-03-12 | Denso Corporation | Piston pump |
CN114829770A (en) * | 2019-12-20 | 2022-07-29 | 微射流国际公司 | High pressure pump structure |
WO2022218635A1 (en) * | 2021-04-14 | 2022-10-20 | Robert Bosch Gmbh | High pressure pump for a fuel injection system |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4825842B2 (en) * | 2008-06-09 | 2011-11-30 | トヨタ自動車株式会社 | Fuel pump |
JP5642925B2 (en) * | 2008-08-20 | 2014-12-17 | 日産自動車株式会社 | High pressure fuel pump |
AU2009324536A1 (en) * | 2008-12-11 | 2011-07-14 | Proteus Digital Health, Inc. | Evaluation of gastrointestinal function using portable electroviscerography systems and methods of using the same |
JP5472340B2 (en) * | 2012-02-10 | 2014-04-16 | 株式会社デンソー | Fuel supply pump |
JP5939122B2 (en) * | 2012-10-09 | 2016-06-22 | 株式会社デンソー | High pressure pump |
EP2821646A1 (en) * | 2013-07-01 | 2015-01-07 | Delphi International Operations Luxembourg S.à r.l. | High pressure pump |
JP6490382B2 (en) | 2014-10-10 | 2019-03-27 | 株式会社ジェイテクト | Valve device |
JP6406035B2 (en) * | 2015-01-29 | 2018-10-17 | 株式会社デンソー | High pressure fuel pump |
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EP1275848A1 (en) * | 2001-07-13 | 2003-01-15 | Robert Bosch Gmbh | Fuel pump for a fuel system of an internal combustion engine |
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- 2005-10-19 DE DE602005009908T patent/DE602005009908D1/en active Active
- 2005-10-19 EP EP05022826A patent/EP1657438B1/en not_active Expired - Fee Related
- 2005-11-16 US US11/274,268 patent/US20060104843A1/en not_active Abandoned
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JPH0868370A (en) | 1994-06-24 | 1996-03-12 | Nippondenso Co Ltd | High pressure fuel feed pump |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1707799A1 (en) * | 2005-03-30 | 2006-10-04 | Denso Corporation | Fuel pump having plunger and fuel supply system using the same |
WO2009058279A1 (en) * | 2007-10-31 | 2009-05-07 | Caterpillar Inc. | High-pressure pump |
WO2011000598A1 (en) * | 2009-06-29 | 2011-01-06 | Robert Bosch Gmbh | High pressure pump |
EP2317120A1 (en) * | 2009-11-03 | 2011-05-04 | Magneti Marelli S.p.A. | Fuel pump with reduced seal wear for a direct injection system |
ITBO20090721A1 (en) * | 2009-11-03 | 2011-05-04 | Magneti Marelli Spa | FUEL PUMP WITH REDUCED WEAR ON A GASKET FOR A DIRECT INJECTION SYSTEM |
US8556602B2 (en) | 2009-11-03 | 2013-10-15 | MAGNETI MARELLI S.p.A. | Fuel pump with reduced seal wear for a direct injection system |
WO2014135303A1 (en) * | 2013-03-07 | 2014-09-12 | Robert Bosch Gmbh | Pump, in particular fuel pump |
ITMI20131370A1 (en) * | 2013-08-08 | 2015-02-09 | Bosch Gmbh Robert | PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE |
WO2015028195A1 (en) * | 2013-08-27 | 2015-03-05 | Robert Bosch Gmbh | High-pressure pump for a fuel injection system and method for producing a high-pressure pump for a fuel injection system |
WO2016062431A1 (en) * | 2014-10-21 | 2016-04-28 | Delphi International Operations Luxembourg S.À R.L. | Pumping mechanism |
KR20170072886A (en) * | 2014-10-21 | 2017-06-27 | 델피 인터내셔널 오퍼레이션즈 룩셈부르크 에스.에이 알.엘. | Pumping mechanism |
DE102016115281B4 (en) * | 2015-09-18 | 2020-03-12 | Denso Corporation | Piston pump |
CN114829770A (en) * | 2019-12-20 | 2022-07-29 | 微射流国际公司 | High pressure pump structure |
WO2022218635A1 (en) * | 2021-04-14 | 2022-10-20 | Robert Bosch Gmbh | High pressure pump for a fuel injection system |
Also Published As
Publication number | Publication date |
---|---|
EP1657438B1 (en) | 2008-09-24 |
DE602005009908D1 (en) | 2008-11-06 |
JP2006170184A (en) | 2006-06-29 |
US20060104843A1 (en) | 2006-05-18 |
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