CN103850833A

CN103850833A - Fuel supply pump

Info

Publication number: CN103850833A
Application number: CN201310644125.3A
Authority: CN
Inventors: S·佩特里齐亚; A·考比安齐; M·克里斯蒂亚尼
Original assignee: Magneti Marelli SpA
Current assignee: Marelli Europe SpA
Priority date: 2012-12-03
Filing date: 2013-12-03
Publication date: 2014-06-11
Anticipated expiration: 2033-12-03
Also published as: CN103850833B; ITBO20120656A1

Abstract

Provided is a fuel supply pump. The fuel supply pump is provided with a piston (25) which performs displacement in a way of reciprocating rectilinear motion along a cylinder body (20) formed in a pump body (19); the fuel supply pump comprises a tubular part (29) which defines a variable-volume cylindrical space (41) used for fuel and is combined with a tubular end part retainer (40) assembled in the cylinder body (20) so as to allow the fuel to enter the end of suction stroke in a pump chamber (28) to stop the piston (25); and the fuel supply pump also comprises a current limiting device (48) which is assembled in the cylinder body (20) so as to hinder but not to prevent the fuel from flowing out from the cylindrical space (41) during the suction stroke of the piston (25).

Description

Fuel feed pump

Technical field

The present invention relates to a kind of fuel feed pump.The present invention is advantageously applied to the small displacement internal-combustion engine of motor vehicle, in order not lose generality, will be not limited to such small displacement internal-combustion engine in following description.

Background technique

In the industry of small displacement motor vehicle, knownly can manufacture such internal-combustion engine, it comprises cylinder, this cylinder is connected to intake manifold and is connected to discharge manifold by least one exhaust valve by least one intake valve.

Intake manifold is by the air supply from external environment condition in cylinder, and discharge manifold is discharged the gas that produces of burning, is supplied to silencing apparatus, thereby enters in atmosphere.

Fuel (being generally gasoline) is supplied in cylinder by the electrospray supply system that comprises sparger, and described sparger is arranged to inject fuel in intake manifold or to fuel itself be directly injected in cylinder near intake valve.

Fuel supply system also comprises petrolift, this petrolift pumps out and is supplied to the sparger by electronic unit control by fuel from oil storage tank (or fuel tank) under atmospheric pressure, and described electronic unit drives described sparger so that at cylinder air inlet stroke period ground burner oil and also drive this petrolift to supply fuel to sparger under constant pressure.

Typically, petrolift comprises the tubulose pump housing that limits central supply passage, and described passage is connected to oil storage tank and is connected to sparger at opposite side in a side.

Supply passage is engaged in the mode of sliding by the piston that limits variable volume pump chamber in the pump housing, this pump chamber is connected to sparger by an one-way valve of putting, and be further connected to supply passage by multiple openings, described opening connects piston and forms and normally closed by the leaf valve that is fixed to piston itself.

Piston can move with shuttle straight line motion along supply passage under the bias effect of actuator, described actuator comprises electromagnetic actuators and spring, described electromagnetic actuators is suitable in the induction stroke of fuel, piston being moved in the pump housing, and described spring is suitable for making piston move to sparger at the delivery stroke of fuel.

Petrolift also comprises for the first end stop member at piston described in induction stroke end stop and for the second end stop member at piston described in delivery stroke end stop.

Thereby the fuel feed pump of above-mentioned known type has some defects that mainly stem from the following fact, the described fact is in the time of the engine starting of motor vehicle and idling, and this pump is because piston causes producing noise to the relatively thump of described first end stop member.

Summary of the invention

The object of the invention is to propose a kind of fuel feed pump, it does not have above-mentioned defect and can implement with simple and the effective mode of cost.

According to the present invention, a kind of fuel feed pump is proposed, be especially suitable for the fuel feed pump of motor vehicle, it comprises: the pump housing, its restriction has the cylinder body of longitudinal axis; Piston, it is bonded in cylinder body in the mode of sliding, and in cylinder body, limit the pump chamber of variable volume and supply with chamber, described pump chamber is provided with at least one feedway that can be connected to sparger, described supply chamber is communicated with oil storage tank and is connected to described pump chamber by least one opening, and described opening connects piston and forms; Actuator, it is for making described piston move with the to-and-fro motion of linear type along cylinder body, this motion comprises induction stroke and delivery stroke, and described induction stroke is suitable for fuel to be drawn in pump chamber, and described delivery stroke is suitable for fuel to be transported to sparger; And for the first end stop member at piston described in induction stroke end stop; Described piston and described first end stop member have corresponding tubular portion, and described tubular portion is faced mutually, coaxially to extend in the mode of described longitudinal axis, and are being defined for each other the variable volume cylindrical space of fuel; It is characterized in that, described fuel feed pump also comprises current-limiting apparatus, and this current-limiting apparatus is configured as and during the induction stroke of described piston, hinders but do not prevent that fuel from flowing out from described cylindrical space.

Accompanying drawing explanation

Now with reference to the accompanying drawing that its non-limiting example is shown, present invention is described, wherein:

Fig. 1 is the schematic diagram that is provided with the internal-combustion engine of the preferred embodiment of fuel feed pump of the present invention;

Fig. 2 is the longitudinal cross-section view of fuel feed pump shown in Fig. 1;

The plan view of Tu3Shi Tu2Zhong first portion;

Fig. 4 is the cross sectional view of getting along the line IV-IV in Fig. 3;

Fig. 5 is the cross sectional view of the second details shown in Fig. 2, has wherein for the sake of clarity removed some parts; And

Fig. 6 is the cross sectional view of the modification of details shown in Fig. 5.

Embodiment

In Fig. 1, the as a whole internal-combustion engine that comprises cylinder 2 is made in reference character 1 indication, and described cylinder 2 is connected to intake manifold 3 and is connected to discharge manifold 5 by least one exhaust valve 6 by least one intake valve 4.

Supply with the air from external environment condition by the supplying pipe 7 that is controlled by closure 8 to intake manifold 3, and intake manifold 3 is connected to cylinder 2 by the suction tude 9 that is controlled by intake valve 4.Similarly, gas exhaust manifold 5 is connected to cylinder 2 and is further connected to discharge pipe 11 by being controlled by the outlet pipe 10 of exhaust valve 6, the free end of discharge pipe so that be connected to silencing apparatus (for known type and not shown) so as by the air release producing by burning in atmosphere.

Fuel (being gasoline mentioned in the situation that) is fed into cylinder 2 by electrospray supply system 12, and described electrospray supply system 12 comprises the sparger 13 of arranging near intake valve 4, to fuel itself is ejected in suction tude 9.

According to a kind of modification (not shown), sparger 13 is arranged to inject fuel in cylinder 2.

This system 12 also comprises fuel feed pump 14, and it is communicated with in the mode of hydraulic pressure with oil storage tank 15 by the first supplying pipe 16 under atmospheric pressure, and is communicated with in the mode of hydraulic pressure with sparger 13 by the second supplying pipe 17.

The operation of system 12 is optionally controlled by electronic control unit 18, described electronic control unit 18 drive sparger 13 in case during the aspirating stroke of internal-combustion engine by fuel cycle be supplied to cylinder 2, and further driven pump 14 to supply fuel to sparger 13 with constant predetermined pressure.

As shown in Figure 2, pump 14 comprises the pump housing 19, and the described pump housing 19 is configured as and limits cylinder body 20, and this cylinder body has longitudinal substantially vertical axis 21 and comprises wider top part 22 and narrower bottom part 23.

Thereby part 23 is connected to sparger 13 by being connected to pipe 17 transverse to axis 21 from the outstanding fuel outlet joint 24 of the pump housing 19.

The part 22 of cylinder body 20 is engaged in the mode of sliding by piston 25, and described piston 25 comprises plate 26, and described plate 26 is upper chamber 27 and lower chamber 28 fixing and that in part 22 is own, restriction itself is aimed at along axis 21 perpendicular to axis 21.

Piston 25 also comprises tubulose retainer 29, and it to be coaxially terminated to plate 26 in the mode of axis 21 is fixed on described chamber 27 and in the mode of axial restraint.

This chamber 28 is the variable volume pump chambers that are connected to sparger 13 in the part 23 by 30, the one-way valve of known type being put to cylinder body 20.

With reference to Fig. 3 and Fig. 4, fuel is supplied in chamber 28 by suction valve 31, described suction valve 31 comprises multiple supply openings 32 (being five openings 32 mentioned in the situation that) and deformable paillon foil 33, described supply opening 32 parallels to the axis 21 perforation pistons 20 and forms, and described paillon foil 33 is applicable to optionally control fuel to the interior supply of chamber 28 own.

Paillon foil 33 comprises the fixing outside annular coronal 34 by the periphery welding along plate 26, and the multiple central, circular flap portion 35 that quantitatively equals opening 32 quantity is associated with corresponding hole 32 separately, and be connected to coronal 34 by the arm 36 of corresponding elastically deformable, wherein each arm is suitable for displacement, and conventionally corresponding flap portion 35 is remained in the closed position of respective openings 32.

As shown in Figure 2, piston 25 can move along part 22 under the bias effect of actuator 37, described actuator 37 comprises electromagnetic actuators 38 and tubulose magnetic pole 40, described electromagnetic actuators 38 and then comprise is contained in the pump housing 19 and at the circular coil 39 of cylinder body 20 outsides, and described tubulose magnetic pole 40 is to be coaxially fixed to part 22 inside in the mode of axis 21.

It is fixing that magnetic pole 40 is faced retainer 29, and be suitable for the variable volume cylindrical space 41 occupied by fuel with retainer 29 and common restriction of cylinder body 20.

Pump 14 also comprises tubulose pars infundibularis 42, and it in the mode of axis 21 is fixed to described part 22, and is furnished with the recess in the face of plate 26 with coaxial.

Pars infundibularis 42 comprises cylindrical part 43 and butt cup-like portion 44, and described cylindrical part 43 has the internal diameter that is less than magnetic pole 40, and butt cup-like portion 44 is held on plate 26.

Pars infundibularis 42 keeps contacting with plate 26 by spring 45, a part for described spring 45 device for limiting 37, and extend around pars infundibularis 42, and to be coaxially fixed between magnetic pole 40 and part 44 in the mode of axis 21.

In use, piston 25 carries out displacement by actuator 37 with shuttle straight line motion, this motion comprises induction stroke and delivery stroke, described induction stroke is by suction valve 31 suction of fuel and be drawn in pump chamber 28, and described delivery stroke is discharged fuel by valve 30 and is discharged to outside chamber 26 itself.

At delivery stroke end, the coil 39 of electromagnetic actuators 38 is switched on; The bias voltage that piston 25 overcomes spring 45 carries out displacement to contact with magnetic pole 40, thereby increases the volume of chamber 28; And the flap portion 35 of suction valve 31 is by the corresponding open position displacement from the closed position of opening 32 to opening 32 of the fuel pressure in part 44 itself, to allow, fuel is incorporated in chamber 28.

The coil 39 of actuator 38 is in induction stroke end power-off; The flap portion 35 of suction valve 31 moves in their closed position again by corresponding arm 36; And piston 25 carries out displacement to reduce the volume of described chamber 28 and open valve 30 under spring 45 effects.

Piston 25 at induction stroke end by magnetic pole 40 stop at delivery stroke end by end stop ring 46 with coaxial in the mode of axis 21 is fixed on part 22.

In order to reduce the noise of the pump 14 being caused encircling 46 impacts by piston 25, this ring 46 is made up of elastic material, preferably but be not to be made up of elastomer or plastic materials.

In order to reduce the noise by retainer 29, magnetic pole 40 being impacted and cause, pump 14 is provided with ring washer 47 (Fig. 5), this ring washer to be to be coaxially fixed between retainer 29 and magnetic pole 40 and to be made up of elastic material in the mode of axis 21, preferably but be not to be made up of elastomer or plastic materials.

In order further to reduce the noise by retainer 29, magnetic pole 40 being impacted and cause, pump 14 is also provided with current-limiting apparatus 48, and this current-limiting apparatus is configured as and during the induction stroke of piston 25, hinders but do not prevent that fuel from flowing out from space 41.

With reference to Fig. 2 and Fig. 5, device 48 comprises sleeve pipe 49 mentioned in the situation that, and it is to be coaxially installed on retainer 29 and magnetic pole 40 inner sides in the mode of axis 21.

This sleeve pipe 49 locks onto on magnetic pole 40 by interference and has external diameter, described external diameter approaches but is less than the internal diameter of retainer 29, thereby partly seal this space 41, and itself jointly limit annular pass 50 with retainer 29, this annular pass is suitable for allowing fuel to pass through between space 41 and cylinder body 20.

Difference shown in modification shown in Fig. 6 and Fig. 5 is only to be substituted by sleeve pipe 51 at Fig. 6 middle sleeve 49, and described sleeve pipe 51 locks onto on magnetic pole 40 by interference, but also is couple to retainer 29 with the slide type of Fluid Sealing.

Sleeve pipe 51 has at least one calibration hole 52, and it extends through sleeve pipe 51 transverse to axis 21, and allows fuel to pass through between space 41 and cylinder body 20.

Fuel feed pump 14 has some advantages that mainly stem from the following fact, the described fact is that the existence of current-limiting apparatus 48 allows to hinder fuel outflow space 41 during the induction stroke of piston 25, thereby allow braking action to be applied on piston 25, and reduce the noise by retainer 29, magnetic pole 40 being impacted and cause.

Claims

1. a fuel feed pump, is especially suitable for the fuel feed pump of motor vehicle, and it comprises: the pump housing (19), and its restriction has the cylinder body (20) of longitudinal axis (21); Piston (25), it is bonded in cylinder body (20) in the mode of sliding, and in cylinder body (20), limit the pump chamber (28) of variable volume and supply with chamber (27), described pump chamber (28) is provided with at least one feedway (30) that can be connected to sparger (13), described supply chamber (27) is communicated with oil storage tank (15) and passes through at least one opening (32) and is connected to described pump chamber (28), and described opening (32) connects piston (25) and forms; Actuator (37), it is for making described piston (25) move with the to-and-fro motion of linear type along cylinder body (20), this motion comprises induction stroke and delivery stroke, described induction stroke is suitable for fuel to be drawn in pump chamber (28), and described delivery stroke is suitable for fuel to be transported to sparger (13); And for the first end stop member (40) at piston (25) described in induction stroke end stop; Described piston (25) and described first end stop member (40) have corresponding tubular portion (29,40), described tubular portion (29,40) mutually face, coaxially to extend in the mode of described longitudinal axis (21), and be defined for each other the variable volume cylindrical space (41) of fuel; It is characterized in that, described fuel feed pump also comprises current-limiting apparatus (48), and this current-limiting apparatus is configured as and during the induction stroke of described piston (25), hinders but do not prevent that fuel from flowing out from described cylindrical space (41).

2. fuel feed pump according to claim 1, is characterized in that, described cylindrical space (41) is by cylinder body (20) radially sealing and open diametrically towards inner side toward the outer side.

3. fuel feed pump according to claim 1 and 2, it is characterized in that, described current-limiting apparatus (48) comprises sleeve pipe (49), described sleeve pipe (49) with coaxially in the mode of described longitudinal axis (21) at described tubular portion (29,40) extend inside, lock onto tubular portion (29,40) one of, and have and be less than another tubular portion (29,40) diameter of internal diameter, thus described cylindrical space (41) is connected to and supplies with chamber (27).

4. fuel feed pump according to claim 1 and 2, it is characterized in that, described current-limiting apparatus (48) comprises sleeve pipe (51), described sleeve pipe (51) with coaxially in the mode of described longitudinal axis (21) at described tubular portion (29,40) extend inside, be couple in a fluid tight manner two tubular portions (29,40), and there is at least one hole (52), thereby described cylindrical space (41) is connected to and supplies with chamber (27).

5. fuel feed pump according to claim 1 and 2, is characterized in that, also comprises the second end stop member (46), at piston (25) described in the stop of delivery stroke end.

6. fuel feed pump according to claim 5, is characterized in that, described the second end stop member (46) is made up of elastic material, is particularly made up of elastomer or plastic materials.

7. fuel feed pump according to claim 1 and 2, is characterized in that, also comprises ring washer (47), and this ring washer is being contained in cylindrical space (41) between described tubular portion (29,40).

8. fuel feed pump according to claim 7, is characterized in that, described ring washer (47) is made up of elastic material, is particularly made up of elastomer or plastic materials.

9. fuel feed pump according to claim 1 and 2, it is characterized in that, described actuator (37) comprises electromagnetic actuators (38) and spring (45), described electromagnetic actuators (38) is for moving described piston (25) in its induction stroke, and described spring (45) is for moving described piston (25) at its delivery stroke.

10. fuel feed pump according to claim 9, it is characterized in that, described electromagnetic actuators (38) comprises circular coil (39) and tubulose magnetic pole (40), described circular coil (39) is contained in the pump housing (19) and in cylinder body (20) outside, and described tubulose magnetic pole (40) is to be coaxially fixed to cylinder body (20) inside and to limit described first end stop member (40) in the mode of described longitudinal axis (21).