CN201851248U - High-pressure fuel pump - Google Patents

High-pressure fuel pump Download PDF

Info

Publication number
CN201851248U
CN201851248U CN 201020621276 CN201020621276U CN201851248U CN 201851248 U CN201851248 U CN 201851248U CN 201020621276 CN201020621276 CN 201020621276 CN 201020621276 U CN201020621276 U CN 201020621276U CN 201851248 U CN201851248 U CN 201851248U
Authority
CN
China
Prior art keywords
plunger
high potential
cam
potential assembly
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 201020621276
Other languages
Chinese (zh)
Inventor
唐朝晖
张建新
华冠群
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Automotive Diesel Systems Co Ltd
Original Assignee
Bosch Automotive Diesel Systems Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Automotive Diesel Systems Co Ltd filed Critical Bosch Automotive Diesel Systems Co Ltd
Priority to CN 201020621276 priority Critical patent/CN201851248U/en
Application granted granted Critical
Publication of CN201851248U publication Critical patent/CN201851248U/en
Priority to PCT/CN2011/082412 priority patent/WO2012065569A1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F04B1/0413—Cams
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The utility model relates to a high-pressure fuel pump comprising a shell in which a cylindrical high-pressure assembly containing chamber is arranged, a high-pressure assembly used for pressurizing fuel oil and a drive shaft driving the high-pressure assembly to operate by utilizing a cam, wherein the high-pressure assembly comprises a plunger sleeve installed in the high-pressure assembly containing chamber in a plugging manner, a plunger piston making back-and-forth reciprocating movement in the plunger sleeve and a cam slave unit driven by the cam on a driven shaft to drive the plunger piston to make back-and-forth reciprocating movement; and the cam slave unit comprises a tappet body sliding in the high-pressure assembly containing chamber and a roller installed in the tappet body and jointed with the cam surface of the cam on the driven shaft. Guide slots extended along the direction parallel to the axial direction of the plunger piston are arranged at the periphery of the tappet body, guide piece jacks are arranged at parts of the shell corresponding to the guide slots, guide pieces are inserted and fixed in the guide piece jacks, and the inner ends of the guide pieces are inserted in the guide slots. The high-pressure fuel pump can save the processing and assembling time and avoid leakage.

Description

High pressure fuel pump
Technical field
The utility model relates to the high-voltage vehicle pump, and in particular for the high-pressure service pump of internal-combustion engine (for example diesel engine) common rail system, wherein, the high potential assembly of high-pressure service pump has improved cam driven device.
Background technique
At the fuel injection system that is used for vehicle or miscellaneous equipment, for high pressure fuel is fed to motor, high-pressure service pump is used.High-pressure service pump generally includes one or more high potential assembly, is fed to motor after being used for fuel oil is pressurized to high pressure.
Schematically show a kind of existing high-pressure service pump among Fig. 1, it mainly comprises: housing 5, it limits the common power shaft cavity volume and extends perpendicular to the common power shaft cavity volume in inside cam driven device cavity volume and plunger bushing installation cavity, annular shoulder 25 are with cam driven device cavity volume and plunger bushing installation cavity separately but keep the two connection; Plunger type high-pressure assembly 2, its main body are installed in the housing 5; Live axle 3, it is installed in the live axle cavity volume of housing 5, and has cam 50, is used to drive high potential assembly 2.
High potential assembly 2 mainly comprises: plunger bushing 20, and it is fixed in the plunger bushing installation cavity of housing 5, and the axial position of plunger bushing 20 is limited by shoulder 25; Plunger 22, it moves forward and backward in plunger bushing; Check valve apparatus 24, it is installed in the plunger bushing, thereby limits pressurizing chamber between plunger 22 and check valve apparatus 24 in plunger bushing; Cam driven device 4, it is installed in the cam driven device cavity volume of housing 5, and is driven and drive plunger by cam 50 and move forward and backward; Delivery connection 23, it is installed in check valve apparatus 24 outsides, is used for high pressure fuel is exported from high potential assembly by check valve apparatus 24.
Check valve apparatus 24 allows to flow in the pressurizing chamber from the fuel oil that fuel tank is fed to the high potential assembly on the one hand, but does not allow the fuel oil in the pressurizing chamber to reflux to the fuel tank direction; On the other hand, allow the direction of the arrow F of fuel oil in Fig. 1 in the pressurizing chamber to discharge and be fed in motor or the common rail system, but the fuel flow returns that does not allow to discharge is in pressurizing chamber.
Referring to Fig. 2-4, tappet body 6 that slides before and after cam driven device 4 mainly is included in the cam driven device cavity volume and the roller 8 that is installed in the tappet body.Roller 8 is rotatably installed in the rotating shaft 7, is provided with sliding bearing 15 between roller 8 and the rotating shaft 7.
Plunger 22 is pushed with the anterior interior spring 12 that is placed in cam driven device cavity volume by retaining plate 14 and is butted on the cam driven device 4.Spring 12 also is biased into the roller 8 of cam driven device 4 on the camming surface of cam 50.
When live axle 3 rotations, the cam lobe on the camming surface of cam 50 raises cam driven device 4 and advances in plunger bushing by cam driven device 4 drive plunger 22.After cam lobe turned over cam driven device 4, spring 12 actuating cam driven devices 4 fell in the depression position of camming surface, thereby plunger 22 retreats in plunger bushing.
In order to keep the correct location of cam driven device 4 in cam driven device cavity volume, on cam driven device 4, be equipped with from the guiding element 10 of the periphery projection of tappet body 6, in cam driven device cavity volume, be formed with and be parallel to the axially extended respective guide slots 16 of plunger.Guiding element 10 inserts in the guide grooves 16, and along be parallel to plunger axis to direction in guide groove, slide, the motion of drive cam driven device 4 and retainer are correctly located by this.
Owing to be provided with cam driven device cavity volume and the two annular shoulder that separates 25 of plunger bushing installation cavity in the housing 5, and because from the guiding element 10 of the periphery projection of tappet body 6, therefore can't will be installed to the cam driven device cavity volume through the plunger bushing installation cavitys from cam driven device 4 and spring 12 and retaining plate 14.For this reason, offer mounting hole 17 in the bottom of housing 5.In when assembling, earlier plunger bushing 20 is installed in the plunger bushing installation cavity, be with spring 12 and retaining plate 14 to pack in the cam driven device cavity volume plunger 22 by mounting hole 17 again, plunger 22 is inserted in the plunger bushings 20.Then, cam driven device 4 is installed in the cam driven device cavity volume, makes guiding element 10 insert in the guide groove 16 by mounting hole 17.Then, again live axle 3 is installed in the live axle cavity volume.Seal up mounting hole 17 with Sealing 18 at last.
In above-mentioned high pressure fuel pump, offer mounting hole 17 in the bottom of housing 5 and need expend the plenty of time with sufficient size.In addition, above-mentioned assembly operation also bother, consuming time.And although 17 sealed 18 sealings of mounting hole, because mounting hole 17 is positioned at the bottom of housing 5, so the lubricant oil in the cam driven device cavity volume is revealed by mounting hole 17 easily.In addition, when needs are pulled down piston rod, spring, retaining plate and cam driven device, need earlier Sealing 18 is pulled down, drainage is fallen lubricant oil in the driven device cavity volume, live axle 3 is pulled down again.Therefore the maintenance of piston rod, spring, retaining plate and cam driven device, replacing be trouble very.
Therefore, need improve existing high pressure fuel pump, to address the above problem.
The model utility content
The purpose of this utility model provides a kind of high pressure fuel pump, and in particular for the high-pressure service pump of internal-combustion engine (for example diesel engine) common rail system, it can solve in the prior art the relevant the problems referred to above of installation with the tappet body of cam driven device well.
In order to realize this purpose, according to an aspect of the present utility model, a kind of high pressure fuel pump comprises:
Housing, it has cylindrical high potential assembly cavity volume in inside;
The high potential assembly that fuel oil (for example diesel oil) is pressurizeed; With
Utilize the cam drive high potential assembly so that the live axle of its operation, it partly is installed in the described housing;
Wherein, described high potential assembly comprises: plunger bushing, and it is plugged in described high potential assembly cavity volume; The plunger that moves back and forth before and after in described plunger; Cam drive on the driven shaft and drive the cam driven device that moves back and forth before and after the plunger;
Described cam driven device comprises: the tappet body that slides in the high potential assembly cavity volume; Be installed in the roller in the tappet body, described roller engages with the camming surface of live axle cam;
Wherein, the periphery of described tappet body be provided with along be parallel to plunger axis to the guiding recess that extends of direction, housing with the corresponding position of guiding recess on be provided with outstanding guiding protuberance, described guiding protuberance insert in the guiding recess and allow the guiding recess with respect to the guiding protuberance along be parallel to plunger axis to direction slide.
According to the utility model, with the high potential assembly cavity volume when housing is assembled, whole high potential assembly is installed to the described high potential assembly cavity volume from the outside opening of high potential assembly cavity volume.
According to a preferred implementation of the present utility model, described guiding protuberance is the guiding element that is installed in the housing, and insert in the guiding recess the inner of described guiding element.
According to a preferred implementation of the present utility model, described guiding element is held at least within it and is comprised pin portion, and described guiding element passes the guiding element jack that is formed in the housing.
According to a preferred implementation of the present utility model, described guiding element is fastened in the described guiding element jack by drive fit or thread engagement.
According to a preferred implementation of the present utility model, described guiding recess is a guide groove.
According to a preferred implementation of the present utility model, described housing has airtight bottom.
According to a preferred implementation of the present utility model, described high-pressure service pump also comprises from fuel tank the suction fuel oil and with the oil feed pump of supplying fuel to described high potential assembly, described oil feed pump is installed on the described housing.
According to a preferred implementation of the present utility model, described tappet body has the cylindrical peripheral surface that the interior perimeter surface with the high potential assembly cavity volume is slidingly matched.
According to a preferred implementation of the present utility model, described plunger bushing has assembly department that is plugged in the high potential assembly cavity volume and the shoulder that pushes against on the part of the outer surface of outer cover around the high potential assembly cavity volume.
According to a preferred implementation of the present utility model, described high potential assembly cavity volume has constant inner diameter.
According to a preferred implementation of the present utility model, described high potential assembly comprises that also the roller with described cam driven device pushes against the spring on the camming surface of live axle cam.
According to a preferred implementation of the present utility model, described plunger has the enlarged diameter rear end, and described enlarged diameter rear end is limited to a retaining plate on the plunger, and described spring pushes against in described retaining plate and pushes against on described tappet body with the rear end with described plunger.
According to a preferred implementation of the present utility model, described guiding element is the pilot pin that is a tight fit in the guiding element jack.
According to a preferred implementation of the present utility model, be provided with the leakage oil discharge passage that feasible fuel oil along the clearance leakage between plunger and the plunger bushing all turns back to fuel tank in the described plunger bushing.
High pressure fuel pump of the present utility model is preferably the high-pressure service pump that is used for diesel engine.For the diesel engine that is equipped with common rail system, described high potential assembly is connecting described common rail system.
According to the utility model, housing bottom needn't be offered mounting hole, therefore the housing bottom oil leakage that can avoid mounting hole to cause.
In addition, processing is less than the situation of offering the large scale mounting hole in the prior art at housing bottom far away at the small size guiding element required time of jack in housing, and the guiding element jack that is arranged in the case side face above cam driven device cavity volume can not cause the oil leakage of cam driven device cavity volume.
In addition, whole high potential assembly can directly be packed high potential assembly cavity volume neutralization into from wherein pulling down, and irrelevant with live axle, so the installation and removal of high potential assembly are easy and consuming time less.
Description of drawings
Aforementioned and others of the present utility model will more completely be understood and be understood by the detailed introduction of being done with reference to the accompanying drawings, wherein:
Fig. 1 is a kind of side sectional view of high pressure fuel pump of prior art;
Fig. 2 is the show in schematic partial sections of matching relationship between the cam driven device of high potential assembly of high pressure fuel pump shown in Figure 1 and the housing.
Fig. 3 is the front view of cam driven device shown in Figure 2;
Fig. 4 is the side view that cam driven device shown in Figure 2 is done along the arrow B direction
Fig. 5 is the forward sectional view according to the high pressure fuel pump of a mode of execution of the present utility model.
Fig. 6 is the sectional view of the high pressure fuel pump done of the A-A direction in Fig. 5.
Fig. 7,8 is similar to Fig. 5,6 view, but high potential assembly etc. are removed, to show the high potential assembly cavity volume.
Fig. 9 is the show in schematic partial sections according to matching relationship between the cam driven device of the high potential assembly of the high pressure fuel pump of a mode of execution of the present utility model and the housing.
Figure 10 is the side view that cam driven device shown in Figure 9 is done along the arrow C direction.
Embodiment
Fig. 5,6 shows the embodiment's of high pressure fuel pump of the present utility model overall arrangement.Described high pressure fuel pump can be used for the internal-combustion engine supply high pressure fuel to vehicle or miscellaneous equipment.
At present, at vehicular field, the rail technology is adopted more and more altogether.The generation of common rail injection system intermediate fuel oil pressure and the injection of fuel oil are disconnected from each other.Fuel oil is supplied and is stored in by high-pressure service pump in the common rail with certain high pressure, and rail is connected to successively with branch form on the sparger of electronic control unit controls altogether, the plunger that each sparger comprises precision machined nozzle and driven by o.Each solenoid valve of electronic control unit controls injected fuel in corresponding cylinder.Therefore, high pressure fuel pump of the present utility model can constitute parts in internal-combustion engine (for example diesel engine) common rail system, and so that high pressure fuel is total in the rail to supplying with, rail then injects fuel in the motor by sparger altogether.
Can see that from Fig. 5,6 it mainly comprises high-pressure service pump of the present utility model: housing 5, it limits in inside along the common power shaft cavity volume of horizontal expansion and the cylindrical high potential assembly cavity volume that longitudinally extends perpendicular to the common power shaft cavity volume; Oil feed pump 1 by housing 5 carryings; Plunger type high-pressure assembly 2 (2 '), it partly is installed in the housing 5; Live axle 3, it is installed in the live axle cavity volume of housing 5, and has cam 50, is used to drive high potential assembly 2, and live axle 3 also is used to drive oil feed pump 1.
Housing 5 is preferably the casting shell.It can be made for single-piece integratedly, also can be formed by a plurality of component-assembled together.
Oil feed pump 1 is installed on the housing 5, be used for sucking fuel oil (for example diesel oil) from the fuel tank (not shown), and it is fed to the total oil supply gallery 35 (Fig. 6) that is formed in the housing, fuel oil enters the branch line corresponding with high potential assembly from total oil supply gallery 35 and supplies with oil duct 31 (Fig. 6), then through supplying with the high potential assembly oil supply hole 30 (Fig. 6) that oil duct 31 links to each other with branch line respectively and being supplied in high potential assembly 2 and 2 '.Fuel oil from oil feed pump 1 can be fed to total oil supply gallery 35 by the pipeline (not shown) that is formed on housing 5 inside, also can be fed to total oil supply gallery 35 through high potential assembly fuel inlet 40 (see figure 5)s by the pipe fitting (not shown) that is connected housing 5 outsides.
Oil feed pump 1 be installed on the housing 5 and with the end coupling of live axle 3 so that drive by live axle 3.Oil feed pump 1 can have traditional structure, for example, can be traditional vane pump, gear pump etc.
High potential assembly is used for the fuel oil from oil feed pump 1 being pressurizeed and being fed to motor or common rail.The quantity of high potential assembly is at least one, but in order to reduce the fluctuation of charge oil pressure, is preferably two or more.Two high potential assemblies 2 and 2 ' have been shown among the figure.
Live axle 3 extends through housing 5, and is supported on the housing 5 by bearing means respectively at the place, two ends.
Live axle 3 drives oil feed pump 1 and high potential assembly 2,2 ' simultaneously.For this reason, the end of live axle 3 is used for rotation and drives oil feed pump 1, and the middle part of live axle 3 is provided with cam 50, is used for drive plunger formula high potential assembly 2,2 '.Each high potential assembly is arranged along the direction of described live axle.
The front end 54 of live axle 3 is a drive end, and it extends to outside the housing 5, and the output of launched machine drives and rotate, and preferably is driven by driving mechanism.
According to the mode of execution shown in the figure, each high potential assembly 2,2 ' is the plunger type high-pressure assembly, and is installed in abreast on the housing 5.These two high potential assemblies have identical structure, and a therefore following structure at high potential assembly 2 is described in detail.Certainly, high potential assembly 2 can have different structures with 2 '.
High potential assembly 2 mainly comprises: plunger bushing 20, its underpart are fixed in the high potential assembly cavity volume of housing 5, and have valve installation room and the plunger compartment that communicates with each other in inside, and the axial position of plunger bushing 20 is limited by shoulder 29 (Fig. 6); Plunger 22, it moves forward and backward in described plunger compartment; Check valve apparatus 24, it is installed in the described valve installation room, thereby limits pressurizing chamber between the front end of plunger 22 and check valve apparatus 24 in the plunger compartment; Cam driven device 4, it is installed in the high potential assembly cavity volume of housing 5, and is driven and drive plunger by cam 50 and move forward and backward; Delivery connection 23, it is installed in check valve apparatus 24 outsides, is used for high pressure fuel is exported from high potential assembly by check valve apparatus 24.
High potential assembly 2 mainly comprises: plunger bushing 20, and it is fixed in the cylindrical high potential assembly cavity volume 55 (seeing Fig. 7,8) of housing 5, and has valve installation room and the plunger compartment that communicates with each other in inside; Plunger 22, it moves forward and backward in described plunger compartment; Check valve apparatus 24, it is installed in the described valve installation room, thereby limits pressurizing chamber 26 between the front end of plunger 22 and check valve apparatus 24 in the plunger compartment; Cam driven device 4, the cam 50 on its driven shaft 3 drive and drive plunger 22 and move forward and backward.
Plunger bushing 20 has the cylindrical assembly department 27 that is positioned at its approximate mid-section, and the internal diameter of the external diameter of this assembly department and high potential assembly cavity volume 55 about equally.After inserting the bottom of plunger bushing 20 and middle part in the high potential assembly cavity volume 55, assembly department 27 cooperates with high potential assembly cavity volume 55 and limits the radial position of plunger bushing 20 with respect to housing 5.Between the interior perimeter surface of the outer surface of assembly department 27 and high potential assembly cavity volume 55 seal ring is housed.
Plunger bushing 20 also has from the shoulder 29 of assembly department 27 top outward radial projections, and described convex shoulder is used for and high potential assembly cavity volume 55 outer openings housing upper surface portion 57 (Fig. 7) butt on every side, to limit the axial position of plunger bushing with respect to housing.
Be formed with oil supply hole 30 in the plunger bushing 20, its two ends respectively with check valve apparatus 24 and housing in branch line supply with oil duct 31 and be communicated with.
The assembly that check valve apparatus 24 is made up of two one-way valves, one of them one-way valve allow the fuel oil in oil supply hole 30 to flow in the pressurizing chamber 26, but do not allow fuel flow returns in the pressurizing chamber 26 in oil supply hole 30; Fuel oil in another one-way valve permission pressurizing chamber 26 is discharged and is fed to motor or is total in the rail, but the fuel flow returns that does not allow to discharge is in pressurizing chamber 26.The check valve apparatus of this function is as known in the art, and its structure miscellaneous is devised easily, therefore is not described in detail here.
Cam driven device 4 is roller type cam driven devices, and it mainly is included in the high potential assembly cavity volume tappet body 6 that slides before and after the axial direction of plunger 22 and is installed in roller 8 in the tappet body.Roller 8 is rotatably installed in the rotating shaft 7, and rotating shaft 7 is fixed in the tappet body 6.Rotate and reduce wear for the ease of roller 8, be provided with sliding bearing 15 between roller 8 and the rotating shaft 7.
Tappet body 6 can have the cylindrical peripheral surface that the interior perimeter surface with high potential assembly cavity volume 55 is slidingly matched.
Plunger 22 has the enlarged diameter rear end, by this retaining plate 14 is remained on plunger back-end.The spring of installing around the plunger bushing bottom in the front portion of high potential assembly cavity volume 12 presses against retaining plate 14 on the cam driven device 4, thereby make the rear end of plunger 22 always push against on cam driven device 4, keep plunger 22 and cam driven device 4 fluid-tight engagement each other always thus.Spring 12 also is biased into cam driven device 4 on the camming surface of cam 50, thereby always keeps the roller 8 of cam driven device 4 to engage with the camming surface rolling of cam 50.
When live axle 3 rotations, the cam lobe 52 on the camming surface of cam 50 raises cam driven device 4 and advances in the plunger compartment by cam driven device 4 drive plunger 22.After cam lobe 52 turned over cam driven device 4, spring 12 actuating cam driven devices 4 fell in the depression position of camming surface, thereby plunger 22 retreats in the plunger compartment, and like this, cam actuated plunger 22 front and back in the plunger compartment move back and forth.
Described high potential assembly is the plunger pump that the cam 50 on the driven shaft 3 drives.The quantity of high potential assembly equals the quantity of cam 50.Among the embodiment shown in Figure 5, two high potential assemblies 2,2 ' are provided, and two cams 50 of driven shaft 3 drive respectively.These two cams 50 are formed on the live axle 3 on the axial position corresponding with high potential assembly 2,2 ', and setover with an angle rule ground each other in a circumferential direction around the axis of live axle 3.The camming surface of each cam 50 has at least one (mode of execution shown in Fig. 6 is three of regular distribution each other) cam lobe 52.In the situation shown in the figure, when live axle 3 rotated a circle, each cam 50 drove high potential assembly running three times by its cam lobe 52, and when a high potential assembly running suction fuel oil, fuel oil is discharged in another high potential assembly running, and this will describe in detail below.Under state shown in Figure 5, the piston 22 in the high potential assembly 2 is positioned at the top dead center of its stroke, and promptly the volume of pressurizing chamber is positioned at minimum value; Piston 22 in the high potential assembly 2 ' is positioned at the lower dead center of its stroke, and promptly the volume of pressurizing chamber is positioned at maximum value.The operation cycle that this high potential assembly is misplaced helps suppressing motor or the supplying fuel pressure surge in the rail altogether.
Cam 50 can be formed integrally as the part of live axle 3, perhaps, can make separately and be installed on the live axle 3.
When high-pressure service pump is worked, be supplied in total oil supply gallery 35 from the low-voltage fuel of oil feed pump 1, enter branch line from total oil supply gallery 35 again and supply with the oil duct 31, supply with oil duct 31 from branch line then and be supplied to the oil supply hole 30.When retreating (moving along the direction that away from the direction of check valve apparatus 24, promptly causes pressurizing chamber 26 volumes to increase) at plunger 22, the fuel oil in the oil supply hole 30 is inhaled in the pressurizing chamber 26.When advancing (towards check valve apparatus 24, promptly the direction that causes pressurizing chamber 26 volumes to reduce moves) at plunger 22, the fuel oil in the pressurizing chamber 26 is pressurizeed by plunger 22 and discharges outside high-pressure service pump by check valve apparatus 24.
When before plunger 22 and then to the fuel oil in the pressurizing chamber 26, pressurizeing because the pressure in the pressurizing chamber 26 is very high, therefore have fuel oil in a small amount in the outer surface of plunger 22 and the gap between plunger compartment's inwall along backward direction leakage.In order to collect the fuel oil of this part leakage, in plunger bushing 20, be formed with the oil trap 32 of annular and lead to the leakage oil discharge passage 34 of plunger bushing 20 peripheries from oil trap 32 round plunger 22 in the approximate mid-section of plunger compartment.
Corresponding leakage oil branch line in leaking oily discharge passage 34 and being formed on housing 5 returns oil duct 60 and is communicated with, and each branch line returns oil duct 60 and is communicated to the public oil duct 65 (referring to Fig. 6) that always returns, and this always returns 65 of oil ducts and leads to fuel tank.Like this, the high temperature fuel oil that leaks along the outer surface of plunger 22 is collected in the oil trap 32, and all can return oil duct 60, always return oil duct 65 and turn back in the fuel tank, and can not influence the temperature of the fuel oil in supplied with pressurized chamber through leaking oily discharge passage, branch line.
In addition, temperature transfer for fear of the high temperature fuel oil that leaks arrives the fuel oil of supplying with, each oil supply hole, branch line are supplied with oil duct, the aggregate supply oil duct is arranged in a side of these high potential assemblies, and respectively leak oily discharge passage, branch line returns oil duct and always returns the opposite side that oil duct is arranged in these high potential assemblies.Like this, the branch line of leakage under high temperature fuel oil by independent setting returns oil duct and always returns oil duct and all turn back in the fuel tank, and the fuel oil temperature that therefore can not cause entering in the pressurizing chamber raises, and also just can not cause the viscosity of fuel oil to reduce and the quantity of fuel leakage increase.
The correct location in the high potential assembly cavity volume for drive cam driven device 4 in high potential assembly cavity volume 55 and maintenance cam driven device 4, formed in the periphery of the tappet body 6 of cam driven device 4 and to be parallel to the axially extended guiding recess of plunger, and, on the position corresponding with the guiding recess, housing 5 is provided with the guiding protuberance, it can be formed in the housing 5, also can be the separate part that is installed to housing.This guiding protuberance insert in guiding recess and allow the guiding recess with respect to the guiding protuberance along be parallel to plunger axis to direction slide.
Each high potential assembly can be equipped with at least one pair of guiding recess that is fitted to each other and guiding protuberance.
In a preferred embodiment, the guiding recess is the form of guide groove 82, and the guiding protuberance is the form of guiding element 80, referring to Fig. 9,10.On the position corresponding with guide groove 82, break-through housing 5 has formed guiding element jack 85 (Fig. 8), and guiding element 80 is inserted and secured in the guiding element jack 85.Insert in the guide groove 82 the inner of guiding element 80, to allow guide groove 82 to slide with respect to guiding element 80 front and back, thereby utilize guiding element 80 guiding tappet bodies 6 in high potential assembly cavity volume 55 along be parallel to plunger axis to direction slide, and keep the correct location of tappet body 6 in high potential assembly cavity volume 55.The position of guiding element jack 85 is provided with like this, and promptly before and after tappet body 6 is in high potential assembly cavity volume 55 in the sliding process, the inner of guiding element 80 always is arranged in guide groove 82.
Guide groove 82 perpendicular to plunger axis to the plane in can have various feasible shape of cross sections, the inner of guiding element 80 has the respective cross-sectional shapes that cooperates with guide groove 82.
Guiding element 80 can be simple pilot pin, and it is by being tightly fixed in guiding element jack 85.Perhaps, the part of guiding element 80 (inside part) can be a pin portion.
Perhaps, guiding element 80 can be fixed in the guiding element jack 85 by screw thread.
Can be provided with Sealing between guiding element 80 and the guiding element jack 85.
According to the utility model, in the housing 5 of high pressure fuel pump, be provided with the single high potential assembly cavity volume 55 corresponding with each high potential assembly 2, and the tappet body 6 of cam driven device 4 is provided with recessed guide groove 82, therefore, cam driven device 4 can directly insert the high potential assembly cavity volume from the outer openings of high potential assembly cavity volume 55.
High potential assembly cavity volume 55 preferably has constant inner diameter, so that processing.
When high-pressure service pump is assembled, in the live axle cavity volume of the housing 5 of can earlier live axle 3 being packed into.Then, cam driven device 4 is inserted the high potential assembly cavity volume from the outer openings of high potential assembly cavity volume 55, make the guide groove 82 alignment guide spare jacks 85 of tappet body 6.Then, will be inserted and secured in the guiding element jack 85, and insert in the guide groove 82 the inner of guiding element 80 to part 80.Then, can plunger 22 (being with spring 12 and retaining plate 14) and plunger bushing 20 (being with check valve apparatus 24) be inserted in the high potential assembly cavity volume by the outer openings of high potential assembly cavity volume 55.Plunger bushing 20 has been determined position with respect to housing 5 with screw plunger bushing 20 to be fixed on the housing 5 then by its assembly department 27 and shoulder 29.Like this, just finished the assembling of high potential assembly on housing.As can be seen, whole high potential assembly is installed, is compared with from the both sides of housing high potential assembly being installed in the prior art from a side of housing, simple to operate and consuming time less.
In addition, when needs are pulled down high potential assembly so that its each parts are overhauled or when safeguarding, can directly each parts be pulled down from high potential assembly cavity volume 55, and not need as prior art, to pull down earlier live axle, so the dismounting of the peace of high potential assembly is easy and consuming time less.
According to the utility model, the bottom of housing 5 can be airtight, and need not offer mounting hole in the bottom of housing 5, but above cam driven device cavity volume, offer the guiding element jack in the housing side, therefore the bottom of housing 5 is integrally closeds, and the situation of the oil leakage in the cam driven device cavity volume can not take place.
In addition, the diameter of guiding element jack 85 is far smaller than the diameter of prior art middle shell bottom mounting hole.Therefore, the processing guiding element required time of jack is less than the required time of offering mounting hole in the prior art at housing bottom far away in housing.
In sum, obvious because previously described prior art on overall performance according to high-pressure service pump of the present utility model.
Though show and described the utility model that based on certain embodiments the utility model is not restricted to shown details.On the contrary, in claim and be equal in the scope of replacement, various details of the present utility model can be manufactured.

Claims (10)

1. high pressure fuel pump comprises:
Housing, it has cylindrical high potential assembly cavity volume in inside;
The high potential assembly that fuel oil is pressurizeed; With
Utilize the cam drive high potential assembly so that the live axle of its operation, it partly is installed in the described housing;
Wherein, described high potential assembly comprises: plunger bushing, and it is plugged in described high potential assembly cavity volume; The plunger that moves back and forth before and after in described plunger; Cam drive on the driven shaft and drive the cam driven device that moves back and forth before and after the plunger;
Described cam driven device comprises: the tappet body that slides in the high potential assembly cavity volume; Be installed in the roller in the tappet body, described roller engages with the camming surface of live axle cam;
It is characterized in that, the periphery of described tappet body be provided with along be parallel to plunger axis to the guiding recess that extends of direction, housing with the corresponding position of guiding recess on be provided with outstanding guiding protuberance, described guiding protuberance insert in the guiding recess and allow the guiding recess with respect to the guiding protuberance along be parallel to plunger axis to direction slide.
2. high pressure fuel pump as claimed in claim 1 is characterized in that, described guiding protuberance is the guiding element that is installed in the housing, and insert in the guiding recess the inner of described guiding element.
3. high pressure fuel pump as claimed in claim 2 is characterized in that, described guiding element is held at least within it and comprised pin portion, and described guiding element passes the guiding element jack that is formed in the housing.
4. high pressure fuel pump as claimed in claim 3 is characterized in that, described guiding element is fastened in the described guiding element jack by drive fit or thread engagement.
5. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that described guiding recess is a guide groove.
6. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that described housing has airtight bottom.
7. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that described high-pressure service pump also comprises from fuel tank the suction fuel oil and with the oil feed pump of supplying fuel to described high potential assembly, described oil feed pump is installed on the described housing.
8. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that described high potential assembly cavity volume has constant inner diameter.
9. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that, be provided with the leakage oil discharge passage that feasible fuel oil along the clearance leakage between plunger and the plunger bushing all turns back to fuel tank in the described plunger bushing.
10. as each described high pressure fuel pump in the claim 1 to 4, it is characterized in that described high pressure fuel pump is the high-pressure service pump that is used for diesel engine, described high potential assembly is connecting the common rail system of motor.
CN 201020621276 2010-11-18 2010-11-18 High-pressure fuel pump Expired - Lifetime CN201851248U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN 201020621276 CN201851248U (en) 2010-11-18 2010-11-18 High-pressure fuel pump
PCT/CN2011/082412 WO2012065569A1 (en) 2010-11-18 2011-11-18 High-pressure fuel pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201020621276 CN201851248U (en) 2010-11-18 2010-11-18 High-pressure fuel pump

Publications (1)

Publication Number Publication Date
CN201851248U true CN201851248U (en) 2011-06-01

Family

ID=44093645

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201020621276 Expired - Lifetime CN201851248U (en) 2010-11-18 2010-11-18 High-pressure fuel pump

Country Status (2)

Country Link
CN (1) CN201851248U (en)
WO (1) WO2012065569A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102465801A (en) * 2010-11-18 2012-05-23 博世汽车柴油系统股份有限公司 High-pressure fuel pump
WO2012065569A1 (en) * 2010-11-18 2012-05-24 Robert Bosch Gmbh High-pressure fuel pump
CN103661938A (en) * 2012-08-02 2014-03-26 贝尔直升机德事隆公司 Radial fluid device with multi-harmonic output
CN104421083A (en) * 2013-08-21 2015-03-18 铃木株式会社 High-pressure fuel pump
CN105822473A (en) * 2015-01-22 2016-08-03 通用汽车环球科技运作有限责任公司 Unit pump for use in a combustion engine
CN108723880A (en) * 2018-04-11 2018-11-02 东莞安默琳机械制造技术有限公司 High pressure micro adjusts pump and lubricating system with trace amount

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9061760B2 (en) 2012-08-02 2015-06-23 Bell Helicopter Textron Inc. Independent blade control system with rotary blade actuator
US9376205B2 (en) 2012-08-02 2016-06-28 Bell Helicopter Textron Inc. Radial fluid device with variable phase and amplitude
US8857757B2 (en) 2012-08-02 2014-10-14 Bell Helicopter Textron Inc. Independent blade control system with hydraulic pitch link
US8973864B2 (en) 2012-08-02 2015-03-10 Bell Helicopter Textron Inc. Independent blade control system with hydraulic cyclic control
CN112412722B (en) * 2020-11-05 2022-07-05 太原理工大学 High-speed active lubrication radial static balance plunger pump for high-water-based medium
CN114198229B (en) * 2021-12-13 2024-04-26 重庆红江机械有限责任公司 Cam box assembly of large high-pressure oil pump

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5339724A (en) * 1991-03-05 1994-08-23 Wartsila Diesel International Ltd. Oy Arrangement for the lubrication of the piston member of a fuel injection pump
DE4227853C2 (en) * 1992-08-22 1996-05-30 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
CN2639547Y (en) * 2003-07-28 2004-09-08 上海浦东伊维燃油喷射有限公司 Strengthened fuel-injection pump assembly
CN2663678Y (en) * 2003-07-28 2004-12-15 上海东维燃油喷射有限公司 High power type oil spout pump assembly
DE102006012458A1 (en) * 2006-03-17 2007-09-20 Robert Bosch Gmbh Roller tappet for a pump element of a high-pressure fuel pump
JP2008128164A (en) * 2006-11-24 2008-06-05 Bosch Corp High pressure fuel supply pump
CN201851248U (en) * 2010-11-18 2011-06-01 博世汽车柴油系统股份有限公司 High-pressure fuel pump

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102465801A (en) * 2010-11-18 2012-05-23 博世汽车柴油系统股份有限公司 High-pressure fuel pump
WO2012065569A1 (en) * 2010-11-18 2012-05-24 Robert Bosch Gmbh High-pressure fuel pump
CN102465801B (en) * 2010-11-18 2014-08-13 博世汽车柴油系统有限公司 High-pressure fuel pump
CN103661938A (en) * 2012-08-02 2014-03-26 贝尔直升机德事隆公司 Radial fluid device with multi-harmonic output
CN103661938B (en) * 2012-08-02 2016-08-17 贝尔直升机德事隆公司 Rotor craft, radial fluid device and the method for offer multiple-harmonic fluid flow
CN104421083A (en) * 2013-08-21 2015-03-18 铃木株式会社 High-pressure fuel pump
CN104421083B (en) * 2013-08-21 2017-04-12 铃木株式会社 High-pressure fuel pump
CN105822473A (en) * 2015-01-22 2016-08-03 通用汽车环球科技运作有限责任公司 Unit pump for use in a combustion engine
CN108723880A (en) * 2018-04-11 2018-11-02 东莞安默琳机械制造技术有限公司 High pressure micro adjusts pump and lubricating system with trace amount

Also Published As

Publication number Publication date
WO2012065569A1 (en) 2012-05-24
WO2012065569A8 (en) 2013-01-03

Similar Documents

Publication Publication Date Title
CN201851248U (en) High-pressure fuel pump
US10190553B2 (en) Pumping unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
CN102959227A (en) Pump, in particular a high-pressure fuel pump
CN101828025B (en) High pressure pump assembly for common rail system
CN201851241U (en) High-pressure fuel oil pump
CN200943554Y (en) Multiple fuel diesel engine fuel injection pump
CN104395597A (en) Fuel pump assembly
CN102465801B (en) High-pressure fuel pump
CN105508107A (en) Integrated high-pressure oil pump assembly for high-pressure common-rail fuel injection system of diesel engine
KR20140069080A (en) Fuel injection pump arrangement and method for operating an internal combustion engine
CN204126791U (en) High pressure fuel pump
CN103299065A (en) High-pressure pump
CN101542107A (en) High-pressure fuel feed pump
CN203374412U (en) Fuel return system of high pressure common rail pump
CN107850010B (en) Multi-plunger cryopump with intake manifold
CN107076124B (en) Fuel pump
CN215259135U (en) Electric grease pump
CN101387276B (en) Axial plunger type high voltage common rail pump
CN205315181U (en) Integrated form diesel engine high pressure common rail fuel injection high -pressure oil pump assembly for system
CN203239480U (en) High-pressure fuel pump
CN208564826U (en) A kind of high pressure distribution rotor
CN203685509U (en) Extra high pressure axial plunger pump
CN201599076U (en) Lubricating oil pressurizing pump for diesel engine
CN208534658U (en) A kind of oil transfer pump of the automatically controlled injection diesel of single cylinder
CN201277432Y (en) Novel oil pump

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20110601

Effective date of abandoning: 20140813

RGAV Abandon patent right to avoid regrant