CN208919183U - Spring base and fuel-injection pump including it - Google Patents

Abstract

The utility model discloses a kind of spring base and including its fuel-injection pump, the spring base includes: central part and the peripheral part for surrounding the central part, and the central part protrudes from the peripheral part；The central part includes top surface and the peripheral wall for surrounding the top surface, and the peripheral wall connects the top surface and the peripheral part；The central part includes centre bore；The center position of the top surface of the central part towards the central part is tilted to the peripheral part.According to the utility model, pass through the selection of change and material to spring base shape, the spring base of the utility model had both reduced plunger to the impact force of spring base, to effectively prevent spring base to damage, the service life of spring base is extended, while but also plunger can be more easily installed in place.

Description

Spring base and fuel-injection pump including it

Technical field

The utility model relates to the fuel feed system of internal combustion engine more particularly to a kind of spring base and including its fuel spray Penetrate pump.

Background technique

The fuel feed system of internal combustion engine is well known.Fuel spray is generally included using the fuel feed system of common rail system Penetrate pump installation, common rail system and multiple fuel injection valves.Wherein, fuel injection pump installation is used to aspirate fuel from fuel tank And it is pressed and delivered to common rail system, common rail system is for storing the high pressure fuel from fuel injection pump installation, each fuel spray Penetrate in one cylinder body of correspondence that valve is arranged in multiple cylinder bodies of internal combustion engine so that the high pressure fuel being stored in common rail system into It is given in each cylinder body.

Fuel injection pump installation includes fuel-injection pump.Existing fuel-injection pump include: be formed with a upright hole or The shell in arranged side by side two upright hole and the chamber being connected to upright hole；The plunger bushing being assembled in upright hole, plunger Being inserted with respectively in set can be in the plunger wherein moved back and forth；The camshaft being rotatably supported, is formed on camshaft and column Fill in corresponding and in a chamber driving cam.The lower end of plunger is placed on corresponding tappet body, in tappet body It is formed with cavity towards the side of driving cam, it can be around pin rolling and can edge by idler wheel by the pin shaft that is mounted on tappet body Pin shaft be axially movably maintained in cavity.Spring, spring are provided between fixed plunger bushing and movable tappet body Lower part and tappet body upper surface between be additionally provided with spring base.The central part aperture of spring base, the lower end of plunger pass through The centre bore of spring base and be placed on tappet body, and the lower end of plunger is limited in the lower surface of spring base central part Between the upper surface of tappet body.For the ease of the lower end of plunger is assembled to spring base central part lower surface with very Between the upper surface of cylinder, when the lower end of plunger is when the state being placed on tappet body, the central part of spring base There are certain gaps between lower surface and the upper surface of the lower end of plunger.

As the cam shaft rotates, due to the effect of spring, tappet body and the spring being pressed against between spring and tappet body Seat can change with the outline position of driving cam and reciprocally move up and down.During tappet body and spring base decline, Certain declines faster spring base and can impact and decline slower plunger in a flash, and then plunger is driven to move downwardly together.By In in the period in each reciprocating movement, the impact of a spring base and plunger can all occur, spring base is easy to cause to damage.

Therefore, it is necessary to improve to spring base in the prior art.

Utility model content

One purpose of the utility model is to overcome above-mentioned defect in the prior art, provide a kind of spring base and including Its fuel-injection pump.

One aspect according to the present utility model provides a kind of spring base for fuel-injection pump, the spring base packet Include: central part and the peripheral part for surrounding the central part, the central part protrude from the peripheral part；In described Peripheral wall of the center portion point including top surface and the encirclement top surface, the peripheral wall connect the top surface and the peripheral part；It is described Central part includes centre bore；The top surface of the central part is towards the center position of the central part to the periphery Part tilts.

In some embodiments, the centre bore includes interconnected the first hole and the second hole, first hole location In the center of the central part, the center is deviateed in second hole, and first hole flaring is described second Hole.

In some embodiments, the rigid scope of the spring base is 3000-4000N/m.

In some embodiments, the material of the spring base is alloy spring steel.

In some embodiments, the alloy spring steel is 50CrV4.

In some embodiments, the spring base is integrally formed by a sheet material.

In some embodiments, the peripheral wall of the central part is with the top surface and with the peripheral part Round-corner transition.

Other side according to the present utility model provides a kind of fuel-injection pump, including above-mentioned spring base.

In some embodiments, the fuel-injection pump further include: be formed at least one upright hole and with upright hole The injection pump housing of the chamber of connection；The plunger bushing being fixedly fitted in the upright hole is inserted with one in the plunger bushing A plunger, the plunger can move back and forth in the plunger bushing；The cam rotatably supported by the injection pump housing Axis is formed with driving cam that is corresponding with the plunger and being located in the chamber on the camshaft；The tappet body It is arranged in the upright hole, the plunger is placed on the tappet body, and the cavity is formed in the tappet body Towards the side of the driving cam；Spring between the plunger bushing and the tappet body is set, and the spring will be described Idler wheel is biased on the driving cam, and the spring base is arranged between the spring and the tappet body, the spring base The peripheral part by the spring bias on the tappet body, the lower end of the plunger passes through the institute of the spring base State the centre bore of central part and be limited in the central part of the spring base lower surface and the tappet body Upper surface between；The fuel that plunger set upper side is arranged in enters and fuel discharge valve assembly, and the fuel enters and fuel row Out valve module be configured to the camshaft rotation allow fuel be sucked into the fuel-injection pump and make by The fuel for being drawn into the fuel-injection pump is further pressurizeed and is ejected.

Detailed description of the invention

The aforementioned and other side of the application will be more fully understood from aftermentioned detailed description and in conjunction with following attached drawing Face.It should be pointed out that the ratio of each attached drawing is possible to different for clearly explained purpose, but this will not influence to this The understanding of application.In the accompanying drawings:

Fig. 1 shows the longitudinal sectional view of the fuel injection pump installation of one embodiment according to the present utility model；

Fig. 2 shows the partial sectional view of the tappet body of one embodiment according to the present utility model；

Fig. 3 shows what the spring base of one embodiment according to the present utility model was adapted to spring, tappet body and plunger Partial section enlarged view；

Fig. 4 shows the schematic perspective view of the spring base of one embodiment according to the present utility model；

Fig. 5 shows the cross-sectional view of the spring base of one embodiment according to the present utility model.

In each attached drawing of the application, structure is identical or intimate feature is indicated by the same numbers.

Description of symbols:

Fuel injection pump installation 1

Vane pump 3

Fuel metering device 5

Overflow valve 7

Fuel-injection pump 9

Plunger 11

Vertical section 111

Upper surface 112

Lower end 12

Plunger bushing 13

Tappet body 15

Upper surface 16

Camshaft 17

Injection pump housing 19

Injection pump housing component 19a

Injection pump housing component 19b

Upright hole 21

Bearing 23

Drive cam 25,27

Chamber 28

Cavity 29

Pin shaft 31

Idler wheel 33

Spring 35

Fuel enters and 37 plunger chamber 39 of fuel discharge valve assembly

Valve holder 41

Fuel injection passages 43

Spring base 45

Central part 47

Lower surface 471

Centre bore 48

First hole 481

Second hole 482

Lower surface 483

Peripheral part 49

Top surface 51

Peripheral wall 53

Specific embodiment

The preferred embodiment of the utility model is described in detail below with reference to example.It will be understood by those skilled in the art that These exemplary embodiments are not meant to form any restrictions to the utility model.

Fig. 1 shows the longitudinal sectional view of the fuel injection pump installation of one embodiment according to the present utility model.Such as Fig. 1 It is shown, the fuel injection pump installation 1 of one embodiment according to the present utility model generally include the vane pump 3 fitted together, Fuel metering device 5, overflow valve 7 and fuel-injection pump 9.Vane pump 3 is from fuel tank suction of fuel and delivers fuel into fuel Metering units 5, the adjustable fuel quantity that will be fed into fuel-injection pump 9 of fuel metering device 5, are supplied to fuel-injection pump 9 fuel is pressurized to be sprayed to flow to common rail system, is transported to each fuel injection valve from common rail system with post fuel.? The fuel pressure of fuel-injection pump 9 is fed into more than in the case where predetermined pressure, overflow valve 7 can act to spray from fuel Penetrate 9 discharge part fuel of pump.In addition, fuel injection pump installation 1 may also include an eduction valve, for making part of fuel return to combustion Hopper.

Fuel-injection pump 9 includes two plungers 11, corresponding plunger bushing 13, corresponding tappet body 15 and camshaft 17.It is convex Wheel shaft 17 is supported on injection pump housing 19, protrudes one end of camshaft 17 across injection pump housing 19, with from engine (not shown) receives driving torque, so that camshaft 17 and engine synchronization rotate.

Injection pump housing 19 includes injection pump housing component 19a and injection pump housing component 19b.Injection pump housing component It is formed in 19a there are two upright hole 21, each plunger bushing 13 is fixedly fitted in corresponding upright hole 21, and plunger 11 is distinguished It is inserted into each plunger bushing 13, the lower end of plunger 11 is placed on corresponding tappet body 15, so as to past in plunger bushing 13 It is multiple mobile.Injection pump housing component 19b and blade pump case are installed to injection pump housing component by bolt or similar device The both ends of 19a, camshaft 17 are rotatably retained on injection pump housing 19 by bearing 23.It is respectively used to each plunger 11 Driving cam 25 and 27 is formed on camshaft 17, and is located at and is formed in injection pump housing component 19a below upright hole 21 In interior chamber 28.It should be noted that a upright hole 21 can also be simply formed in injection pump housing component 19a.Alternatively, Two holes to form an angle between each other can also be formed in injection pump housing component 19a.

Fig. 2 is equipped with the partial sectional view of the tappet body of idler wheel.Tappet body 15 towards driving cam 25 and 27 side It is formed with cavity 29, can be rolled idler wheel 33 around pin shaft 31 by the pin shaft 31 that is mounted on tappet body 15 and can be along pin shaft 31 It is axially movably maintained in cavity 29.As shown in Figure 1, being additionally provided with spring 35, bullet between plunger bushing 13 and tappet body 15 Spring 35 by tappet body 15 towards 17 bias of camshaft so that idler wheel 33 is always kept in contact with corresponding driving cam 25 and 27. In this way, the outline position with driving cam 25 and 27 changes, and tappet body 15 passes through idler wheel thereon when camshaft 17 is rotated 33 reciprocally move up and down against the driving outer profile of cam 25 and 27.

Enter and fuel discharge valve assembly 37 as shown in Figure 1, being provided with fuel in 13 upper end of plunger bushing.39 shape of plunger chamber Enter between fuel discharge valve assembly 37 and each plunger 11 in fuel, the fuel injection being formed in valve holder 41 is logical Road 43 is located at fuel and enters and 37 top of fuel discharge valve assembly.Fuel enters and the specific structure of fuel discharge valve assembly 37 exists Known in the art, thus the detailed description to it is omitted.

When the salient angle change in location that a plunger drives cam example driving cam 27 as shown in figure 1 with one to moving down When dynamic, negative pressure is formed in plunger chamber 39 corresponding with the plunger, fuel enters and fuel discharge valve assembly 37 is with known side Formula is closed, to prevent fuel from flowing back from common rail system.At the same time, another plunger with another driving cam for example scheme The salient angle change in location of driving cam 25 in 1 and move up, positive pressure is formed in plunger chamber 39 corresponding with the plunger, Fuel enters and fuel discharge valve assembly 37 is in a known manner in opening, so that fuel is sprayed from fuel injection passages 43, quilt It is transported to common rail system.This process alternately repeatedly carries out, so that fuel is continuously transported to common rail system.

As shown in Figure 3, it is shown that the spring base 45 and spring 35, tappet body 15 of one embodiment according to the present utility model The partial section enlarged view being adapted to plunger 11.It should be noted that the upper surface 16 of tappet body 15 shown in Fig. 3 is flat Face, and the upper surface of tappet body shown in FIG. 1 is in center protrusion.This is the citing of two kinds of embodiments of tappet body.Fig. 4 The schematic perspective view and cross-sectional view of the spring base 45 of one embodiment according to the present utility model are shown with Fig. 5.Referring to Fig. 3-Fig. 5 simultaneously combines Fig. 1 to understand, spring base 45 includes central part 47 and the peripheral part 49 for surrounding central part 47.Periphery Part 49 is pressed against on tappet body 15 by spring 35.Central part 47 is projected upwards in peripheral part 49.Central part 47 opens up There is centre bore 48, the lower end 12 of plunger 11 passes through centre bore 48 and is placed on tappet body 15, and the lower end of plunger 11 12 are limited between the lower surface 471 of the central part 47 of spring base 45 and the upper surface 16 of tappet body 15.

As shown in figure 4, the peripheral part 49 of spring base 45 is circular plate, the central part 47 of spring base 45 is round table-like It and is also plate.In the present embodiment, peripheral part 49 and central part 47 are integrally formed by a sheet material, such as pass through presser Skill is formed.Certainly, it will be appreciated by those skilled in the art that peripheral part 49 and central part 47 can also be individually individual components And it is interconnected to form spring base 45.Central part 47 includes that shape is circular top surface 51 and the peripheral wall for surrounding top surface 51 53.It can be round-corner transition, the peripheral wall 53 and peripheral part of central part 47 between the peripheral wall 53 and top surface 51 of central part 47 49 can be round-corner transition.The centre bore 48 of the central part 47 of spring base 45 includes the first hole 481 and the second hole of connection 482, the aperture for deviateing the second hole 482 of center is less than positioned at the aperture in the first hole 481 of center.It should be understood that the The non-standard round hole in one hole 481 and the second hole 482, therefore the aperture in the first hole 481 and the second hole 482 refers to the size in hole Size, rather than the internal diameter in hole.The aperture in the second hole 482 is greater than the diameter of the lower end 12 of plunger 11, so that plunger 11 Lower end 12 can pass through the second hole 482.Referring to Fig. 3, above the lower end of plunger 11 12 and what is be attached thereto is plunger 11 vertical section 111, the diameter of the vertical section 111 are less than the diameter of lower end 12.The diameter of the vertical section 111 is also less than first The aperture in hole 481.And the diameter of the lower end 12 of plunger 11 is greater than the aperture in the first hole 481.Therefore, when the lower end of plunger 11 After portion 12 passes through the second hole 482, plunger 11 is laterally shifted to the center of spring base 45, thus the vertical section of plunger 11 111 are located in the first hole 481, and the lower surface 483 of the periphery in the first hole 481 can be with the upper surface of the lower end 12 of plunger 11 112 is opposite.

As shown in Figure 3-Figure 5, the top surface 51 of the central part 47 of spring base 45 tilts down in radially inward direction. In this way it is possible to reduce the upper surface 112 of the lower surface of the central part 47 of spring base 45 and the lower end 12 of plunger 11 Between gap.More specifically, the upper surface of the lower end 12 of the lower edge and plunger 11 in the first hole 481 of spring base 45 There is the smallest gap between 112.By the setting of 45 shape of spring base, so that when plunger 11 is installed in place, spring base 45 The first hole 481 lower edge and plunger 11 lower end 12 upper surface 112 between gap very little.Due in tappet body 15 During declining with spring base 45, determine spring base 45 and plunger 11 one factor of impact force size be exactly between the two between Gap, gap is smaller, and impact force is smaller.Therefore, the spring base of the utility model reduces plunger to the impact force of spring base, effectively It prevents spring base from damaging, extends the service life of spring base.

Meanwhile during the installation process, that is, plunger 11 is passed through into the second hole 482 of spring base 45 and moves laterally to spring During in first hole 481 of seat 45, even if the lower end 12 of the lower edge in the first hole 481 of spring base 45 and plunger 11 Gap very little between upper surface 112, and lead to the lower edge in the first hole 481 of spring base 45 and the lower end 12 of plunger 11 Upper surface 112 rubs, and will not influence plunger 11 and be installed in place.Because the contact area very little between the two, thus rub Wipe power also very little.Further, its rigidity is made to become smaller due to this shape of spring base 45, so that more easily deformation occurs. Even if in this way, the upper surface 112 of the lower end 12 of the lower edge and plunger 11 in the first hole 481 of spring base 45 during the installation process It rubbing, the lower edge in the first hole 481 of spring base 45 can also be jacked up upwards and bring it about deformation by plunger 11, thus Plunger 11 is smoothly installed in place.

Therefore, the spring base of the utility model had both reduced plunger to the impact force of spring base, while but also plunger energy It is enough to be more easily installed in place.

In addition, the material of the spring base 45 of the present embodiment is 50CrV4, based on the shape of upper spring seat 45 and in conjunction with this The rigidity of the use of material, the spring base 45 of the present embodiment is about 3260N/m.Certainly, spring base 45 is it is also an option that others Material, such as the alloy spring steel of similar 50CrV4 can be selected, so that the range in stiffness of spring base 45 is in 3000-4000N/ m.This is more advantageous to further compared with small plunger to the impact force of spring base plunger and is installed in place.

It is also contemplated that the centre bore of spring base only includes the first hole positioned at center, at this point, spring base from Plunger top set is set on plunger, allow the first hole periphery lower surface and the lower end of plunger upper surface phase It is right.Under this mounting means, the top surface of the central part of spring base tilts down in radially inward direction, same to reduce Gap between the upper surface of the lower end of the lower surface and plunger of the central part of spring base, to reduce plunger to spring The impact force of seat, effectively prevent spring base to damage, extends the service life of spring base.

Although the foregoing describe specific embodiment of the present utility model, it will be appreciated by those of skill in the art that This is merely illustrative of, and the protection scope of the utility model is defined by the appended claims.Those skilled in the art Under the premise of without departing substantially from the principles of the present invention and essence, many changes and modifications may be made, But these change and modification each fall within the protection scope of the utility model.

Claims (9)

1. one kind is used for the spring base (45) of fuel-injection pump (9), the spring base (45) includes:

Central part (47) and the peripheral part (49) for surrounding the central part (47), the central part (47) protrude from institute State peripheral part (49)；

The central part (47) includes top surface (51) and the peripheral wall (53) for surrounding the top surface (51), and the peripheral wall (53) is even Connect the top surface (51) and the peripheral part (49)；

The central part (47) includes centre bore (48)；

It is characterized in that, the top surface (51) of the central part (47) towards the central part (47) center position to Peripheral part (49) inclination.

2. spring base as described in claim 1, which is characterized in that the centre bore (48) includes the first interconnected hole (481) and the second hole (482), first hole (481) are located at the center of the central part (47), second hole (482) deviate the center, the first hole (481) flaring is second hole (482).

3. spring base as claimed in claim 1 or 2, which is characterized in that the rigid scope of the spring base (45) is 3000- 4000N/m。

4. spring base as claimed in claim 3, which is characterized in that the material of the spring base (45) is alloy spring steel.

5. spring base as claimed in claim 4, which is characterized in that the alloy spring steel is 50CrV4.

6. spring base as claimed in claim 1 or 2, which is characterized in that the spring base (45) is integrally formed by a sheet material.

7. spring base as claimed in claim 1 or 2, which is characterized in that the peripheral wall (53) of the central part (47) with The top surface (51) and with the peripheral part (49) be round-corner transition.

8. a kind of fuel-injection pump, which is characterized in that including the spring base (45) as described in any one of claim 1-7.

9. fuel-injection pump as claimed in claim 8, which is characterized in that the fuel-injection pump further include:

It is formed with the injection pump housing (19) of at least one upright hole (21) and the chamber (28) being connected to upright hole (21)；

The plunger bushing (13) being fixedly fitted in the upright hole (21) is inserted with a plunger in the plunger bushing (13) (11), the plunger (11) can move back and forth in the plunger bushing (13)；

The camshaft (17) rotatably supported by the injection pump housing (19), be formed on the camshaft (17) with it is described Plunger (11) it is corresponding and be located at the chamber (28) in driving cam (25,27)；

Tappet body (15) is arranged in the upright hole (21), and the plunger (11) is placed on the tappet body (15), and And cavity (29) is formed in the tappet body (15) towards the side of driving cam (25,27)；

The spring (35) being arranged between the plunger bushing (13) and the tappet body (15), the spring (35) is by idler wheel (33) It is biased on the driving cam (25,27), the spring base (45) is arranged in the spring (35) and the tappet body (15) Between, the peripheral part (49) of the spring base (45) is biased on the tappet body (15) by the spring (35), institute State plunger (11) lower end (12) pass through the spring base (45) the central part (47) the centre bore (48) and It is limited in the lower surface of the central part (47) of the spring base (45) and the upper surface (16) of the tappet body (15) Between；

Be arranged plunger bushing (13) upper end fuel enter and fuel discharge valve assembly (37), the fuel enter and fuel discharge Valve module (37) be configured to the camshaft (17) rotation allow fuel be sucked into the fuel-injection pump, with And the fuel for being sucked into the fuel-injection pump is made further to be pressurizeed and be ejected.