JP4591873B2 - Fuel pump module - Google Patents

Description

  The present invention relates to a fuel pump module configured by assembling a fuel pump and other members to a sub tank.

  Conventionally, Patent Document 1 discloses a fuel pump module configured by assembling a fuel pump to a sub tank accommodated in a fuel tank. A structure in which a resin lid member that covers the opening of the sub tank is assembled to such a fuel pump module is conventionally known.

JP 2001-254654 A

  Here, there is a case where a resin member exemplified below is disposed on the upper surface of the lid member, and the resin member is desired to be formed integrally with the lid member and the resin. Examples of the resin member include a clamp for locking a flexible tube or harness as a fuel pipe, a fuel pipe, and the like.

  However, in the case where such a resin member is integrally formed with the lid member, it is necessary to form a mold release hole for removing the mold required for the integral molding in a portion of the lid member facing the resin member. It may not be possible. If the die hole is formed on the upper surface of the lid member, for example, if the vehicle turns suddenly, suddenly accelerates, or stops suddenly when the vehicle is running, the fuel in the sub tank easily spills out of the die hole. Then, despite the fact that there is a sufficient amount of fuel in the fuel tank for the fuel pump to suck and discharge, there is a situation in which the fuel in the sub tank is insufficient and the fuel pump cannot discharge the fuel. obtain.

  Accordingly, an object of the present invention is to provide a fuel pump module in which a resin member such as a fuel pipe is integrally formed on the upper surface of a lid member, and the sub tank has insufficient fuel even though there is a sufficient amount of fuel in the fuel tank. Accordingly, it is an object of the present invention to provide a fuel pump module that avoids a situation where fuel cannot be discharged.

According to the first aspect of the present invention, the sub tank, the fuel pump accommodated in the sub tank, the resin lid member covering the opening of the sub tank, and the upper surface of the lid member are integrated with the lid member and the resin. The cover member is formed with a mold release hole for removing the mold required for integral molding in a portion of the lid member that faces the resin member. A member is provided.
According to this, since the die hole is closed by the cover member, it is possible to suppress the fuel in the sub tank from spilling out from the die hole. Therefore, it is possible to avoid a situation where there is insufficient fuel in the sub tank and fuel cannot be discharged by the fuel pump even though there is a sufficient amount of fuel in the fuel tank to be sucked and discharged by the fuel pump. it can.
In the present invention, the resin member is a fuel pipe that allows fuel to flow between the inside and the outside of the sub tank, or a clamp that holds a tube or harness provided outside the sub tank.
Furthermore, in the present invention, the punching hole is formed below the resin member. The cover member closes the die punching hole by fitting into the die punching hole from within the sub tank.

In the invention described in claim 2, a plurality of fuel pipes are arranged side by side so that the axes are in the same direction. In this way, when a plurality of fuel pipes are arranged side by side, there are many cases where it is unavoidable to form a punched hole for the reason described below, and therefore the effect of claim 1 is preferably exhibited.

  Hereinafter, an example in the case where the punched holes must be formed will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the resin lid member 20, the two fuel pipes 21 and 22, and the dies 61, 62, 63, and 64 when performing injection molding thereof. The two fuel pipes 21 and 22 have an L-shape (see FIG. 2) that extends upward from the upper surface 28 of the lid member 20 and is bent so as to extend horizontally. In FIG. 8, the cross section of the horizontally extending portion of the fuel pipes 21 and 22 appears.

And as shown to Fig.8 (a), the metal mold | die 61 which shape | molds the upper part of the fuel pipes 21 and 22 can be demolded upwards. Further, the mold 62 for forming the lower part and the outer part of the fuel pipes 21 and 22 can be removed in the horizontal direction outside. And the metal mold | die 63 which shape | molds the lower part and inner side part of the fuel pipes 21 and 22 has to be demolded to a horizontal direction inner side. However, as shown in FIG. 8A, when the two fuel pipes 21 and 22 are close to each other, the clearance CL between the left and right molds 63 cannot be sufficiently secured. 63 cannot be removed inward in the horizontal direction.
Accordingly, when the two fuel pipes 21 and 22 are close to each other as described above, as shown in FIG. 8 (b), the die holes 26 and 27 are formed in the lid member 20, and the die holes are formed. The mold 64 must be removed downward from 26 and 27.

In the invention according to claim 3 , the cover member is provided in the component housed in the sub tank.
A specific example of this component is the suction filter assembly according to claim 4. Further, in the invention according to claim 5 , the suction filter assembly is assembled to the insertion port of the holder holding the fuel pump. And a holder cap that functions as a stopper for the fuel pump, and the cover member is provided on the holder cap.

In the invention of claim 6, wherein, as the axis of the fuel pump becomes a bottom portion substantially horizontal sub-tank, the fuel pump is accommodated transversely in the sub-tank.
Here, when it is desired to reduce the height of the sub-tank, the fuel pump may be placed horizontally as described above. However, if the height of the sub-tank is low, even if the amount of fuel in the sub-tank is small, the liquid level of the fuel is close to the die-cut hole, so there is a further concern that fuel will spill out of the die-cut hole. Therefore, if the invention according to any one of claims 1 to 5 is applied to the sub-tank in which the fuel pump is accommodated horizontally as described in claim 6 , the effects of the present invention are preferably exhibited.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the drawings, the same or equivalent portions are denoted by the same reference numerals in the drawings.

  FIG. 1 is a two-plane view showing a fuel tank 1 mounted on a vehicle, a flange module 2 attached to an opening 1a of the fuel tank 1, and a fuel pump module 3 attached to a bottom 1b of the fuel tank 1. FIG. 1A is a top view and FIG. 1B is a front view. In addition, the up-down direction shown by the arrow in FIG. 1 shows the gravity direction of the fuel tank 1 mounted on the vehicle. FIG. 2 is a schematic view showing the flange module 2 and the fuel pump module 3 in a state of being removed from the fuel tank 1.

(1) Structure of Fuel Tank 1 The fuel tank 1 is a vertical fuel tank including a first tank chamber 1c that houses a fuel pump module 3 and a second tank chamber (not shown). The opening 1a to which the flange module 2 is attached is located above the first tank chamber 1c. Each of the first tank chamber 1c and the second tank chamber is provided with a transfer jet pump (not shown), and the fuel in the first tank chamber 1c and the second tank chamber is transferred by these transfer jet pumps. Then, the fuel pump module 3 is transferred to the sub tank 10.

(2) Structure of the flange module 2 The flange module 2 has a flange 2a that functions as a lid for closing the opening 1a of the fuel tank 1. On the upper surface side of the flange 2a, there are provided a discharge pipe 2b for discharging fuel to an internal combustion engine mounted on the vehicle, and a return pipe 2c for flowing surplus fuel discharged from the discharge pipe 2b. In addition, electrical connectors 2d and 2e are provided across both surfaces of the flange 2a.

Further, a liquid level detection device for detecting the liquid level of the fuel in the fuel tank 1 is provided on the lower surface side of the flange 2a. As shown in FIG. 2, the liquid level detection device is configured to include a sender gauge 2f, an arm 2g, and a float 2h. When the float 2h moves according to a change in the liquid level, the arm 2g rotates, The liquid level is detected by detecting an electric resistance value corresponding to the amount of rotation of the arm 2g by the sender gauge 2f. In FIG. 1, the illustration of the arm 2g and the float 2h is omitted.
The sender gauge 2f is connected to an electrical connector 2d provided on the flange 2a by a harness (not shown), and outputs a liquid level detection signal to an electronic controller (ECU) (not shown) installed outside.

(3) Structure of Fuel Pump Module 3 The fuel pump module 3 is disposed by being inserted into the fuel tank 1 from the opening 1a of the fuel tank 1, and is fixed to the bottom 1b of the fuel tank 1. The fuel pump module 3 is accommodated in the resin sub tank 10 (see FIG. 3), the resin lid member 20 (see FIG. 4) covering a part of the opening 11 of the sub tank 10, and the sub tank 10. And a module main body 30 (see FIG. 6).
3 is a perspective view schematically showing a state in which a suction filter assembly 40 to be described later is accommodated in the sub tank 10, FIG. 4 is a top view schematically showing the lid member 20 alone, and FIG. It is a 2nd page figure which shows the state which removed the filter case 34 from.

(3-1) Structure of Subtank 10 As shown in FIGS. 1 and 3, a pumping pump 12 for pumping is provided at the lowermost portion of the side surface of the subtank 10. Then, by the operation of the pumping jet pump 12, the fuel passes through the throat portion of the pumping jet pump 12, and the fuel in the first tank chamber 1 c is pumped into the sub tank 10.

  As shown in FIG. 1, the return pipe 2 c and the fuel pump module 3 are connected by a bellows-like hose 4, and surplus fuel that has flowed in from the return pipe 2 c via the hose 4 is the upper surface 28 of the lid member 20. Then, the pipe 5 is circulated through the pipe 5 and then branched by the branch pipe 6 into the pump 6 for pumping and each of the above-described jet pumps for transfer. Therefore, the pump 6 for pumping and the jet pump for transfer are operated by the flow velocity energy of the surplus fuel flowing in from the return pipe 2c.

(3-2) Structure of Lid Member 20 The lid member 20 engages with the sub tank 10 and covers one side (right side in FIG. 3) of the opening 11 of the sub tank 10. The engagement between the lid member 20 and the sub-tank 10 has a snap-fit structure, and the engagement convex portion 25 (see FIG. 4) as the engagement means formed on the lid member 20 is used as the engagement means formed on the sub-tank 10. Is engaged with an engaging recess (not shown).

The upper surface 28 of the lid member 20 includes a first fuel pipe 21 into which fuel discharged from a transfer jet pump installed in the first tank chamber 1c flows, and a transfer jet pump installed in the second tank chamber. And a second fuel pipe 22 into which the discharged fuel flows. The first fuel pipe 21 and the second fuel pipe 22 correspond to a “resin member” recited in the claims.
The first fuel pipe 21 and the second fuel pipe 22 are arranged side by side so that the axis L2 is in the same direction as shown in FIG.

The first and second fuel pipes 21 and 22 and the lid member 20 are integrally formed of resin. Specifically, they are integrally formed by injection molding as described above with reference to FIG.
A two-dot chain line 61 in FIG. 4 indicates the mold 61 in FIG. 8B, and is a mold for molding the L-shaped portions of the first and second fuel pipes 21 and 22 together with the mold 64. . The mold 61 is removed upward, and the mold 64 is removed downward through the die holes 26 and 27.
Accordingly, the punch holes 26 and 27 are formed in a portion of the lid member 20 that faces the first fuel pipe 21 and the second fuel pipe 22.

  On the other hand, an alternate long and short dash line 65 in FIG. 4 indicates a mold 65 different from the molds 61 and 64. The mold 65 is a mold for molding the tip portions of the first and second fuel pipes 21 and 22, and is not divided into upper and lower parts, and the axis of the first and second fuel pipes 21 and 22. Demolded in the direction tip side. Therefore, a mold punching hole is not required for removing the mold 65.

  Further, a groove 23 in which the above-described tube 5 is disposed is formed on the upper surface 28 of the lid member 20. A clamp 24 that locks the tube 5 disposed in the groove 23 is formed on the upper surface 28 of the lid member 20. The clamp 24 and the lid member 20 are integrally formed of resin. In this way, the tube 5 is fitted in the groove 23 and locked by the clamp 24, thereby suppressing the tube 5 from moving due to the pressure of excess fuel.

(3-3) Structure of Module Main Body 30 As shown in FIG. 6, the module main body 30 includes a plurality of fuel pumps 31 and 32 for sucking and discharging fuel, and a nonwoven fabric disposed on the upstream side of the fuel pumps 31 and 32. Filter element 33 (see FIG. 1), a filter case 34 housing the filter element 33 therein, a suction filter assembly 40 disposed upstream of the fuel pumps 31, 32, a plurality of fuel pumps 31, And a resin holder 50 for holding 32.

The filter case 34 has a discharge pipe 341 (see FIG. 2) that discharges fuel boosted by the fuel pumps 31 and 32. As shown in FIG. 1, the discharge pipe 2 b of the flange module 2 and the discharge pipe 341 are connected by a bellows-like hose 7. The filter case 34 and the discharge pipe 341 are integrally formed of resin.
The lower end surface of the filter case 34 is configured as an insertion port 342 for inserting the filter element 33 therein. The insertion port 342 as the lower end surface of the filter case 34 is joined to the joint surface 531 (see FIG. 6) of the holder 50 by welding over the entire circumference thereof, whereby the insertion port 342 is connected to the support portion 53 of the holder 50. It is blocked by. 6 shows the module main body 30 in a state where the filter case 34 is not welded.

As shown in FIGS. 5 and 7, the suction filter assembly 40 includes a bag-like filter body 41, 42 formed of a non-woven fabric, and the filter body 41, 42 arranged inside the filter body 41, 42. A resin-made internal holding member (not shown) that holds the bag shape and holder caps 43, 44 that engage with the holder 50 are configured. The holder caps 43, 44 are formed on the lid member 20. Cover members 433 and 443 are provided to close the die holes 26 and 27.
A plurality (two in this embodiment) of filter bodies 41 and 42, internal holding members, and holder caps 43 and 44 are provided corresponding to the number of fuel pumps 31 and 32.

  The holder caps 43 and 44 are coupled to the internal holding member by means such as welding. In addition, the holder caps 43 and 44 are formed with elbows 431 and 441 that form fuel passages 445 (see FIG. 7) communicating with the inside of the filter main bodies 41 and 42. Outflow ports 432 and 442 of these fuel passages 445 are connected to suction ports (not shown) of the fuel pumps 31 and 32.

  The cover members 433 and 443 are formed in an annular shape so as to surround the protrusions 433a and 443a that fit into the mold punching holes 26 and 27 and the mold punching holes 26 and 27, and come into contact with the lower surface of the lid member 20. The abutting portions 433b and 443b and extending portions 433c and 443c extending from the holder caps 43 and 44 to the abutting portions 433b and 443b are configured.

The elbows 431 and 441 and the cover members 433 and 443 and the holder caps 43 and 44 are integrally formed by injection molding.
Further, the engagement between the holder caps 43 and 44 and the holder 50 has a snap-fit structure, and the engagement projections 434 and 444 as the engagement means formed on the holder caps 43 and 44 are formed on the holder 50. It is engaged with an engaging recess 511 (see FIG. 6) as a coupling means.

  As shown in FIG. 6, the holder 50 includes a pump holding portion 51 that holds the fuel pump, a lid portion 52 that covers a part of the opening 11 of the sub tank 10, and a support that supports the pump holding portion 51 and the lid portion 52. Part 53. The holding portion 51, the lid portion 52, and the support portion 53 are integrally formed of resin to constitute the holder 50 as one component.

And the support part 53 has the above-mentioned joining surface 531, and the support part 53 functions as a filter cap that closes the insertion port 342 of the filter case 34 by welding the filter case 34 to the joining surface 531. And it is comprised as a bottom wall of the internal space 343 (refer FIG. 1) which accommodates the filter element 33 inside.
In addition, these pump holding | maintenance part 51, the cover part 52, and the support part 53 are integrally molded by injection molding.

The pump holding part 51 has a shape in which two grid-like cylindrical members are arranged side by side, and has an insertion port 512 (see FIG. 6) into which the fuel pumps 31 and 32 are inserted. And the holder caps 43 and 44 are assembled | attached to the insertion port 512 by the above-mentioned snap fitting structure. As a result, the holder caps 43 and 44 function as retaining caps for the fuel pumps 31 and 32.
The fuel pumps 31 and 32 are arranged side by side so that the axis L1 serving as the center of rotation is in the same direction. Further, the fuel pumps 31 and 32 are disposed horizontally so that the axis L1 is substantially horizontal with the bottom of the sub tank 10.

The lid part 52 is formed in the outer peripheral part of the support part 53, and is arrange | positioned in contact with the lid member 20 (refer the dashed-dotted line in FIG. 4). A region of the opening 11 of the sub tank 10 that is not covered with the lid member 20 is covered with the lid 52 and the support 53. That is, the entire region of the opening 11 is covered with the lid member 20, the lid 52, and the support 53.
The lid 52 and the pump holding part 51 are engaged with the sub tank 10 by a snap fit structure. Specifically, the engagement convex portion 521 as the engagement means formed on the lid portion 52 and the engagement convex portion 513 as the engagement means formed on the pump holding portion 51 are connected to the engagement formed on the sub tank 10. It is engaged with a mating recess (not shown).

  The support portion 53 has an elbow 532 that forms a fuel passage (not shown) therein. The elbow 532 is provided corresponding to the number of the fuel pumps 31 and 32 and is connected to the discharge ports 312 and 322 of the fuel pumps 31 and 32. As a result, the internal space 343 that houses the filter element 33 and the discharge ports 312 and 322 communicate with each other.

Since the fuel pumps 31 and 32 are placed horizontally, the fuel discharged from the discharge ports 312 and 322 flows in the horizontal direction. The elbow 532 converts the fuel flow direction discharged in the horizontal direction into the vertical direction. Since the outlets 534 of the plurality of elbows 532 are open to the internal space 343, the fuel discharged from the fuel pump 31 and the fuel discharged from the fuel pump 32 flowed out from the outlet 534 of the elbow 532. After that, it merges in the internal space 343.
A check valve 535 is attached to each of the outlets 534 of the elbow 532, and the check valve 535 prevents the fuel that has flowed into the internal space 343 from returning to the fuel pumps 31 and 32. is doing.

  Here, one fuel pump 31 of the two fuel pumps 31 and 32 functions as a main pump that is driven with priority over the other fuel pump 32, and the other fuel pump 32 is only driven by the main pump 31. Then, it functions as a sub pump to be driven when the discharge amount becomes insufficient. For example, when the amount of fuel required by the engine is small, such as when starting the engine, only the main pump 31 is driven, and the amount of fuel required by the engine is large, such as when the engine is heavily loaded. In this case, the sub pump 32 is driven together with the main pump 31.

Next, the operation of the fuel pump module 3 configured as described above will be described.
Electrical connectors 2d and 2e provided on the flange 2a are connected to an electrical connector 314 provided at the end of the main pump 31 and an electrical connector 324 provided at the end of the sub pump 32 by a harness (not shown). Has been. When driving power is supplied via these harnesses and the fuel pumps 31 and 32 are driven, the fuel in the sub tank 10 is supplied to the filter main bodies 41 and 42, the elbows 431 and 441 of the suction filter assembly 40, and the outlet. 432 and 442 are sequentially flowed, and then sucked into suction ports (not shown) of the fuel pumps 31 and 32.

Then, the fuel sucked into the fuel pumps 31 and 32 is discharged from the discharge ports 312 and 322 of the fuel pumps 31 and 32 and flows through the fuel passage inside the elbow 532, the check valve 535, and the outlet 534 in order, It flows out into the internal space 343 surrounded by the filter case 34 and the support portion 53. Therefore, the fuel discharged from the main pump 31 and the fuel discharged from the sub pump 32 merge in the internal space 343. The merged fuel sequentially flows through the filter element 33, the discharge pipe 341 of the filter case 34, the hose 7, and the discharge pipe 2b of the flange module 2, and is supplied to the fuel injection valve installed in the internal combustion engine.
As described above, the surplus fuel supplied to the fuel injection valve is supplied to the jet pump for pumping and the jet pump for transfer.

Next, the effect which the fuel pump module 3 by the said structure show | plays is demonstrated.
According to the fuel pump module 3 according to the present embodiment, since the cover members 433 and 443 that close the mold release holes 26 and 27 are provided, the fuel in the sub tank 10 spills out of the mold release holes 26 and 27. Can be suppressed. Therefore, although there is a sufficient amount of fuel in the fuel tank 1 for the fuel pumps 31 and 32 to suck and discharge, the sub tank 10 runs out of fuel and the fuel pumps 31 and 32 supply fuel. It is possible to avoid problems such as the inability to discharge.

  By the way, in this embodiment, since the fuel pumps 31 and 32 are accommodated horizontally in the sub-tank 10, the height of the sub-tank 10 can be kept low, and when the shape of the fuel tank 1 is flat, etc. It is suitable for use when there are height restrictions on ten installation spaces. However, if the height of the sub tank 10 is low, even if the amount of fuel in the sub tank 10 is small, the liquid level of the fuel is close to the die holes 26 and 27, so that fuel spills out from the die holes 26 and 27. There is even more concern. On the other hand, according to the present embodiment, since the punching holes 26 and 27 are closed by the cover members 433 and 443, the effect of suppressing fuel spillage in the sub tank 10 is preferably exhibited.

(Other embodiments)
In the above embodiment, the cover members 433 and 443 are provided on the holder caps 43 and 44, but may be provided on the elbows 431 and 441. In the above embodiment, the cover members 433 and 443 are provided on the suction filter assembly 40, but may be provided on the pump holding portion 51 of the holder 50.

  In the above embodiment, the die holes 26 and 27 formed in the portion of the lid member 20 facing the fuel pipes 21 and 22 are covered with the cover members 433 and 443, but facing the clamp 24. In the case where the punching hole is formed in the part, the punching hole facing the clamp 24 may be covered with the cover members 433 and 443. Moreover, although the clamp 24 which concerns on the said embodiment latches the tube 5 which distribute | circulates a fuel, it may latch the harness as an electrical wiring.

Moreover, in the said embodiment, although the two cover members 433 and 443 are provided corresponding to the two punching holes 26 and 27, you may form the two extension parts 433c and 443c into one, Moreover, you may form the two contact parts 433b and 443b into one.
Further, in the above embodiment, the two punching holes 26 and 27 are formed corresponding to the two fuel pipes 21 and 22, but the two punching holes 26 and 27 are connected to be one. Also good.

In the above embodiment, the fuel pumps 31 and 32 are arranged horizontally, but they may be arranged vertically so that the axis L1 is substantially perpendicular to the bottom of the sub tank 10. In the above embodiment, a plurality of fuel pumps 31 and 32 are provided, but only one fuel pump may be provided.
As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

It is a 2nd page figure which shows the state by which the fuel pump module which concerns on one Embodiment of this invention was accommodated in the fuel tank, (a) is a top view, (b) is a front view. It is a perspective view which shows typically the fuel pump module and flange module which are shown in FIG. It is a perspective view which shows typically the state by which the suction filter assembly was accommodated in the sub tank shown in FIG. FIG. 3 is a top view schematically showing a single lid member shown in FIG. 2. It is a perspective view which shows typically the single body of the suction filter assembly | attachment body shown in FIG. It is a 2nd page figure which shows the state which assembled | attached the suction filter assembly | attachment body to the module main body of the fuel pump module shown in FIG. 2, (a) is a top view, (b) is a front view. It is sectional drawing of FIG. It is sectional drawing for demonstrating the reason for requiring a die-cutting hole in a cover member.

Explanation of symbols

  1: fuel tank, 3: fuel pump module, 10: sub tank, 11: opening, 20: lid member, 21: first fuel pipe (resin member), 22: second fuel pipe (resin member), 24: clamp (Resin member), 26, 27: die hole, 31: main pump (fuel pump), 32: sub pump (fuel pump), 64: mold, 433, 443: cover member.

Claims (7)

A sub-tank housed in the fuel tank;
A fuel pump that is housed in the sub tank and sucks and discharges fuel in the sub tank;
A resin lid member covering the opening of the sub tank;
A resin member that is disposed on the upper surface of the lid member, and is integrally molded with the lid member and resin,
With
A portion of the lid member facing the resin member is formed with a mold release hole for removing the mold required for the integral molding,
A cover member for closing the punched hole ,
The resin member is a fuel pipe that circulates fuel between the inside and the outside of the sub tank, or a clamp that locks a tube or harness provided outside the sub tank,
The punched hole is formed below the resin member,
Said cover member, a fuel pump module for closing the die-cut hole by fitted to the die-cut hole from within the sub-tank. The fuel pipe, the fuel pump module according to claim 1, wherein the axis is arranged more to have the same orientation. The cover member according to claim 1 or 2 fuel pump module according is provided on the contained component in the sub-tank. A suction filter assembly that is disposed on the suction side of the fuel pump and is assembled with at least a filter that captures foreign matters in the fuel is provided as the component.
The fuel pump module according to claim 3 , wherein the cover member is provided on the suction filter assembly. The fuel pump has an insertion port to be inserted therein, and includes a holder for holding the fuel pump,
The suction filter assembly has a holder cap that is assembled to the insertion port and functions as a stopper for the fuel pump;
Said cover member, the fuel pump module according to claim 4, characterized in that provided in the holder cap. The fuel pump module according to any one of claims 1 to 5 , wherein the fuel pump is housed horizontally in the sub tank so that an axis of the fuel pump is substantially horizontal with a bottom portion of the sub tank. The fuel pump, fuel pump module according to claim 1 to 6, wherein the axis is arranged more to have the same orientation.

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