DE19821229A1 - Motor vehicles fuel pump - Google Patents

Abstract

The fuel pump has a housing (10) with fuel intake (12a) and outlet (13a). A rotor (30) inside the housing applies a pressure to fuel entering through the intake and supplies the fuel to the outlet. The rotor is driven by a motor section (50) within the housing. A cooling passage (60) is located in the housing next to the motor section to cool it. The rotor is positioned at the down-stream end of the housing near the fuel outlet. A fuel filter (40) is positioned in the housing upstream of the rotor.

Description

The present invention relates to a fuel pump according to the preamble of claim 1 or 3 or 4. Insbe In particular, the present invention relates to a fuel pump out for use in a motor vehicle is and especially a motor-powered force cloth pump, which is immersed in fuel Condition used or operated.

Generally, a motor vehicle, which is an elec trically controlled fuel injection system used, so designed to have fuel within a fuel tank pumped out via a fuel pump and then after Pass through a fuel filter through a dispenser device is supplied to a fuel injection. In this It is common for the fuel pump to fall within the Fuel tank is arranged to light the fuel to be able to suck and arranged in one state is in which it is in or under the fuel is diving.

An example of a conventional, commonly used fuel pump of this type is shown in FIG. 7. In the fuel pump 400 shown in this figure, fuel drawn from a suction port 401 is pressurized by rotating a rotor 402 , and then discharged from a discharge port 404 through a gap formed in an engine section 403 so that the fuel is the engine section 403 cools when it flows through the motor section 403 .

The pressure in the fuel un from the rotor 402 ter pressure is set, is about 3 kg / cm ² and the fuel pressure is supplied to the motor section 403 downstream of the ro tors supplied 402nd As a result, a sealing ability or property is required in a connecting portion 407 between a housing body 405 and an upper housing 406 and a connecting portion 409 between the housing body 405 and a lower housing 408 of the fuel pump 400 , which withstands the pressure of the fuel under pressure .

Also, a pressure resistance for an engagement force of the upper casing 406 and lower casing 408 to the housing body 405 of the upper housing 406 and the un tere housing 408 is necessary because a caused by the fuel pressure separation force to the upper housing 406 and the unte re housing 408 acts depending on the respective cross-sectional areas. The existing fuel pump 400 is designed in such a way that end sections 405 a and 405 b of the housing body 405 are pulled over the upper housing 406 and the lower housing 408 and are cold-formed here (e.g. caulked, crimped, folded, etc.), so that the upper housing 406 and the lower housing 408 are fixed to the housing body 405 .

If the sealing property and pressure resistance to Withstand the pressure of the pressurized force so there are different types Restrictions or limits, for example insofar as egg ne high manufacturing accuracy for the joining surfaces the components are necessary, the wall thicknesses are high and the materials that can be used are limited. Consequently productivity deteriorates and costs wake up start when the sealing sections and the pressure-resistant sections cuts increase.

In particular, it can be assumed that the fuel pressure is further increased in order to improve performance of a Mon tors etc. to be adjusted and then higher sealing properties and higher compressive strength are required,  it becomes difficult to the conventional described above Adapting the structure to such requirements.

The US-PS 5,392,750 describes a fuel pump a fuel filter within a housing; this However, fuel pump is designed so that a rotor is arranged downstream of the fuel filter and an engine section is also arranged downstream of the rotor. The This construction does not solve the problem regarding the above mentioned sealing properties and compressive strength.

Furthermore, the Japanese Pa Sho 58-101263 a fuel pump, wel che is constructed so that a motor section of a pump Pen section is separated, so that the pressure of one Rotor pressurized fuel prevented from doing so will abut the motor section. Because this force material pump is constructed so that the motor section of the Fuel that cannot be cooled is another Cooling mechanism necessary to cool the engine section. This is not suitable for equipment in one Motor vehicle where the installation space is limited, etc. Furthermore, it is proposed that instead of the Be provision of another or further cooling mechanism a part of the fuel dispensed in its pressure lowers and is released into the engine section to the Mo to cool the gate section, but this structure deteriorates the pumping power.

The present invention has been made in view of the above problems with conventional fuel pumps and it is therefore an object of the present invention the sealing property and the compressive strength of the force to improve the fabric pump.

Generally speaking, this problem is solved by that a high pressure section on an area as small as  possible is restricted, the arrangement of the rotor section on the discharge-side end section of a housing this is done.

More specifically, the solution to the above is done cited object by the features of claim 1 and 3 respectively or 4, wherein claim 2 is an advantageous development the subject of the invention.

According to a first aspect of the present invention accordingly, a fuel pump is created with: a Ge housing with a fuel intake and a force discharge opening; a rotor inside the housing is arranged to from the fuel intake sucked fuel under pressure and around the Deliver fuel to the fuel vent; one Motor section within the housing for rotating Driving the rotor; and a cooling passage inside the Housing adjacent the motor section to the motor section cut to cool, with the rotor at the downstream end of the housing near the fuel drain opening is.

In the fuel pump with this structure, if the rotor is rotated by the motor section, the force substance discharged from the fuel discharge port after it has cooled the engine section. Since the rotor on the downstream term end is arranged within the housing, the Motor section can be arranged under low pressure and an area where high pressure is applied is limited and a high pressure sealing section is also reduced.

In the fuel pump, which after the first Aspect of the present invention is designed, the Fuel filter upstream of the rotor within the Ge be arranged. With this arrangement, the  Fuel filter also arranged in the low pressure area the.

According to a second aspect of the present invention a fuel pump is created with: a ge housing with a fuel intake opening with a force fabric intake port and a fuel drain port; one Rotor inside the housing to pressurize Fuel drawn from the fuel intake port to the fuel to the fuel drain opening promote; a motor section within the housing for rotatably driving the rotor; a cooling passage inside the housing adjacent to the motor section Cooling the motor section; and a fuel filter in inside the housing, the motor section, the force fabric filter and the rotor in that order the housing from an upstream side towards are arranged on a downstream side, the rotor on downstream end within the housing adjacent to the Fuel discharge opening is arranged, a bypass passage is arranged within the housing which the cooling passage bridges, and the housing a plurality of fuel has suction openings, some of which lead to an inlet of the fuel filter through the cooling passage and others right of this to the inlet of the fuel filter via the By pass passage.

In the fuel pump according to the second aspect of present invention, flows when the rotor from the Mo Tor section is rotated by a portion of the fuel the cooling passage in the fuel filter and the lead Fuel flows through the bypass passage into the Fuel filter. The fuel that passes through each of the through flows from the rotor after passing through the Fuel filter accelerated or pressurized and discharged from the fuel discharge port. The fuel flowing through the cooling passage cools the engine section  and abrasion generated in the motor section is removed from the Fuel filter removed.

Because with the fuel pump with this construction the rotor arranged at the downstream end within the housing the engine section and the fuel filter in a low pressure environment and a surface surface, which is subject to high pressure, is reduced and white terhin a high pressure sealing section is also ver wrestles. Since the passage is still provided, the allows fuel to be fed to the fuel filter without running through the motor section, a pressure ver desire on an upstream side of the rotor is reduced will.

According to a third aspect of the present invention a fuel pump is created with: a housing with a fuel intake port with a fuel intake opening and a fuel drain opening; a rotor in inside the housing to pressurize fuel, that was sucked in by the fuel intake port to the Deliver fuel to the fuel vent; one Motor section within the housing for rotating Driving the rotor; a cooling passage within the Ge housing adjacent to the motor section for cooling the motor section; and a fuel filter inside the housing ses, the fuel intake opening downstream of the Ge is arranged, the fuel filter is arranged is that it is on one side opposite the fuel intake opening is arranged and at least part of the rotor and surrounds the motor section and in one orientation is arranged that a flow direction of the fuel essentially horizontal within the fuel filter and the rotor at the downstream end inside the Housing arranged adjacent to the fuel drain opening is.  

If the Ro Tor is rotated by the motor section is from the Fuel intake opening drawn fuel from the Filtered fuel filter and from the fuel outlet after cooling the engine section.

Because with the fuel pump with this construction the rotor arranged at the downstream end within the housing the engine section can be in a low pressure environment be arranged and an area to which high pressure is applied is reduced and continues to be a high pressure down sealing section reduced. A suction head can also Fuel pump can be reduced in size and the The fuel pump as a whole is becoming more compact.

In the fuel pump according to the third aspect of The present invention includes the arrangement of the force Stoffilters such that he at least a part of the rotor and the motor section surrounds the following cases: the Fuel filter surrounds both the rotor and the engine section; the fuel filter completely surrounds the rotor or partially without surrounding the motor section; of the Fuel filter surrounds all or part of the engine section wise without surrounding the rotor; and the fuel filter surrounds part of the rotor and part of the motor cut.

In the fuel pump according to the third aspect of In the present invention, the engine section can be upstream be arranged upstream of the fuel filter, or the Fuel filter can be upstream of the engine section be ordered. Advantageously and therefore preferred the engine section becomes upstream of the fuel filter is arranged because of abrasion generated by the motor section can be removed from the fuel filter.  

Further details, aspects and advantages of this ing invention emerge from the following Be Description of embodiments based on the drawing.

It shows:

Figure 1 is a vertical section through a fuel pump according to a first embodiment of the present invention.

Fig. 2 is an exploded view of the fuel pump according to the first embodiment;

Fig. 3 is an enlarged sectional view of a main portion of the fuel pump according to the first exporting approximate shape;

Figure 4 is a vertical section through a fuel pump according to a second embodiment of the present invention.

Fig. 5 is a sectional view taken along line II in Fig. 4;

Fig. 6 is an enlarged sectional view of a main portion of the fuel pump according to the second exporting approximate shape; and

Fig. 7 is a vertical section through a conventional fuel pump.

A fuel pump according to a first embodiment of the present invention will now be described with reference to FIGS. 1 to 3.

A fuel pump 1 A (hereinafter referred to as "pump" be distinguished) according to the first embodiment comprises we sentlichen a rotor housing 20, a rotor 30, a fuel filter 40 (hereinafter referred to as a "filter") and a motor section 50, said elements in a housing 10 are arranged; the pump is arranged inside a fuel tank (not shown) of a motor vehicle.

The housing 10 consists essentially of a housing 11 which is essentially cylindrical, its upper and lower sections being open and a lower housing 12 being arranged on a lower edge of the housing body 11 and a housing cover 13 covering the upper opening of the housing Housing body 1 covers.

The housing body 11 is made of a thin upper section 11 from a and a lower thick portion 11 b and c gefer Untitled 11, a stepped portion is defined on an inner surface b side of the abutting portions 11 a and 11. FIG.

The lower housing 12 is annular and constructed so that a central opening as a fuel intake opening 12 a is covered with an intake filter 15 . The lower housing 12 covers the lower edge of the housing body 11 from below and is fastened to the housing body 11 by cold working (for example caulking, flanging, folding, bending, etc.).

An annular seal or packing 16 is arranged along the entire circumference of an annular edge which is formed on a connecting portion of the housing body 11 and the lower housing 12 and a lower edge portion of the filter 40 is arranged on the packing 16 . The package 16 is designed to seal or seal portions between the housing body 11 , the lower housing 12 and the filter 40 , thereby preventing fuel from flowing past the filter 40 unfiltered. A spacer 17 is placed between the filter 40 and the suction filter 15 .

The filter 40 is taken up in the housing body 11 such that its outer circumferential surface is in close contact with an inner circumferential surface of the housing body 11 and it is further arranged so that the filter 15 entered by the suction filter 15 on the underside towards the sen Flows through (from bottom to top in Fig. 1). The motor section 50 is thus arranged downstream of the filter 40 .

The motor section 50 essentially comprises a motor shaft 150 , which serves as an axis of rotation, a holder 52 which supports the lower end of the motor shaft 51 , an armature 53 which is placed on the motor shaft 51 , a plurality of magnets 54 , and one Brush 55 .

The motor shaft 51 is arranged so that its axis of rotation is vertical or vertical. The bracket 52 is constructed from an annular outer ring portion 52 a and an inner ring portion 52 b, which are connected to one another via a plurality of arms 52 c and the outer ring portion 52 a is in the thick portion 11 b of the housing body 11 at an upper surface of the filter 40 is inserted centrally and connected to the housing body 11 . The inner ring portion 52 b carries a bearing 56 which rotatably wave the lower end portion of the engine 51 takes, and a thrust bearing 57 which receives the thrust load of the motor shaft 51st Between the adjacent arms 52 c, a free space or passage is defined, through which the fuel flows. The upper end portion or the upper end side of the motor shaft 51 is supported by a bearing 58 which is connected to the center of the rotor housing 20 , as will be described below.

The armature 53 is fastened to the motor shaft 51 between the bearings 56 and 58 and has a commutator 59 which projects upwards. The commutator 59 is in sliding contact with the brush 55 , which is pre-tensioned by a spring 61 , which is supported on the housing body 11 .

The magnets 54 are arranged opposite to the outer peripheral surface of the armature 53 and on the inner peripheral surface of the thick portion 11 b of the housing body 11 at fixed circumferential intervals BEFE Stigt. Clearances or passages through which the fuel can flow are likewise formed between the adjacent magnets 54 .

The rotor housing 20 is arranged above the brush 55 , the commutator 59 and the spring 61 . The Rotorge housing 20 is attached to the housing body 11 so that its outer peripheral surface with the stepped section 11 c of the housing 11 is in contact and is further in contact with the inner peripheral surface of the thin portion 11 a and the thick portion 11 b .

In the middle of the rotor housing 20 is a passage opening is formed in 21 and the through hole 21 is seated, the bearing 58, which rotatably supports 51 the motor shaft. The upper portion of the motor shaft 51 passes through the through hole 21 and protrudes upward.

A rotor receiving recess 22 is formed in the upper upper surface of the rotor housing 20 in the center thereof and the rotor 30 , which is fixed to the motor shaft 51 , is rotatably received in the rotor receiving recess 22 . A certain portion of the rotor receptacle recess 22 forms a drain or dispensing recess 23 .

In the rotor housing 20 there is also an intake opening 24 , which allows the fuel to enter the rotor receiving recess 22 , a connection opening 25 for receiving an energy supply connection 62 , which is connected to the brush 55 , and a valve receiving opening 26 , which receives a drain valve 70 , said openings of the rotor housing 20 pass through from the bottom thereof to the top. The connection opening 25 and the valve receiving opening 26 are located radially outside the rotor receiving recess 22 .

The housing cover 13 is placed on the rotor housing 20 and its lower surface is in close contact with the upper surface of the rotor housing 20 and its outer peripheral surface is also in close contact with the inner peripheral surface of the thin portion 11 a of the housing body 11 . The upper end of the thin portion 11 a of the housing body 11 is cold deformed inward and is in engagement or abutment with an outer peripheral edge of the upper surface of the housing cover 13 , so that the housing body 11 , the housing cover 13 and the housing 20 Rotorge to a quasi-one-piece Unit are summarized.

On the upper surface of the housing cover 13, a discharge nozzle 13 is a (Fuel discharge port) in the connection to the drain groove 23 of the rotor housing 20, and a schlußdüse to 13 b is formed which serves as a connection port to a power supply; the respective nozzles or tubes protrude upwards. The bottom portion of the closing nozzle 13 b is closed and the power supply connection 62 passes through the closed portion and is connected to it in a sealed or sealed manner.

A drain recess 27 , which communicates with the valve receiving opening 26 of the rotor housing 20 , is formed in the bottom surface of the housing cover 13 .

If it is operated at the pump 1 A of the motor section 50 to place around the rotor 30 in rotation, fuel is sucked from the fuel tank through the suction filter 15 in the housing 10, wherein the suction filter 15 concentration relative large impurities, abrasion, etc. of removed the fuel. The fuel that has flowed through the intake filter 15 flows into the filter 40 and upward therein. The filter 40 filters out fine foreign matter, such as rust particles or the like, which are still present in the fuel.

Fuel filtered by the filter 40 flows through the arms 52 c of the bracket 52 and through the housing body 11 , the magnet 54 and the armature 53 to reach a section below the rotor housing 20 , the fuel cooling the motor section 50 . This means that a path of the fuel that cools the engine section 50 , that is, a cooling passage 60 is formed in the periphery of the armature 53 . In other words, the armature 53 rotates in the fuel flowing through the cooling passage 60 . Therefore, the engine section 50 is continuously cooled by the fuel without heating as long as the pump 50 is operated to suck and deliver fuel. As a result, fuel in the fuel tank can be prevented from being heated and fuel vapors are prevented from occurring in the fuel tank beforehand, thereby making it possible to prevent the interior of the fuel tank from being pressurized in advance.

The fuel, which reaches a location below the rotor housing 20 , enters the rotor receiving recess 22 via the intake opening 24 and is then accelerated or pressurized (for example to approximately 3 kg / cm ² ) by rotating the rotor 30 . The fuel is then discharged from the drain recess 23 in the direction of the drain nozzle 13 a and fed to a fuel injection system, not shown, under pressure.

In the event that the fuel pressure in the Ablaßver recess 23 exceeds a given value of the drain valve 70 , the drain valve 70 opens so that the fuel can flow out through the drain valve 70 and the valve receiving opening 26 from the drain recess 23 to a low pressure section below of the rotor housing 20 to be guided back.

In the pump 1 A according to the above description of the filter 40 and the motor portion 50 are on the Niederdrucksei te upstream of the rotor 30 disposed and only the Ge häuseabdeckung 13 is downstream in the high pressure section Windwärts of the rotor 30 is disposed. Therefore, the parts below the rotor housing 20 , more precisely, all sections or parts below and radially outside of the rotor receiving recess 22 low pressure parts.

As a result, a strength which can withstand the discharge pressure is necessary for the case cover 13 and the ro gate case 20 , to which the pump discharge pressure acts directly, and the choice of material and the thickness providing such strength must be made accordingly or to get voted. On the other hand, the housing body 11 , to which the pump discharge pressure is not present, only needs a strength which can withstand a low pressure before the pressure increase takes place through the rotor 30 and the material selection which can withstand the low pressure and wall thicknesses etc., which areas sufficient for low pressure can be made.

Thus, since 1 A is the area or the area is reduced the high-pressure portion at the pump and increasing the area or the area of the low pressure section (each compared to the prior art), is ei ne weight reduction and cost reduction can be realized.

Also, the sealing portions or sealing portions which must withstand the pump discharge pressure are only the abutment portion 18 ( Fig. 3) between the lower surface of the outer edge portion of the housing cover 13 and the upper surface of the outer edge portion of the rotor housing 20 ; the contact portion 19 ( Fig. 3) of the outer peripheral surface of the housing cover 13 or the outer peripheral surface of the rotor housing 20 with the inner circumferential surface of the housing body 11 may have a sealing force which only has to withstand the low pressure before it is increased by the rotor 30 .

Thus, in this pump 1 A, the number of high-pressure sealing sections and the sealing surfaces themselves are significantly reduced compared to the prior art. Restrictions, for example the formation of the sealing surfaces with high manufacturing accuracy, the application of a high surface pressure to the sealing surface etc. are necessary for the high pressure sealing sections. Therefore, when the number of high pressure sealing portions is increased and the sealing area is increased, problems in the manufacture increase, so that productivity is deteriorated and costs are increased. Consequently, the OF INVENTION dung proper pump 1 A according to the above embodiment in which the number of high-pressure sealing portions and the high-pressure areas are reduced, excellent in the productivity, reduction in manufacturing time and reducing the manufacturing cost.

Furthermore, since the low pressure is present on the housing body 11 before it is increased by the rotor 30 , the device for connecting the housing body 11 to the housing cover 13 can be changed from a cold deformation in the direction of a snap-fit connection. A snap fit connection means here, for example, a connec tion device in which an engagement projection is present on the outer circumferential surface of the housing cover 13 and an engagement opening is formed in the thin portion 11 a of the housing body 11 , in which case the engagement projection engages in the engagement opening. The use of a snap fit connection further reduces costs.

In the case where the housing body 11 and the spring 61 are made of metal, the spring 61 is electrically connected to the housing body 11 and static electricity which is generated when the fuel flows through the filter 40 can be applied via the brush 55 , the spring 61 and the housing 11 are dissipated to ground. In the case in which the holder 52 is also made of metal and the formation of the fuel passage through the holder 52 is optimized, charges that occur on the fuel side and the side of the filter 40 run through the holder 52 to the housing body 11 and are then again in contact with the fuel and are electrically neutralized so that charging can be prevented.

In the pump 1 A in FIG. 2, the filter 40 from the lower opening of the case body 11 are removed from the housing body 11 by removing the lower housing 12 so that only the filter 40 must be replaced by a new filter, if the already existing filter 40 is clogged, which is also economical.

A fuel pump according to a second embodiment of the present invention is explained in more detail below with reference to FIGS. 4 to 6.

A fuel pump 1 B (referred to as "pump" be distinguished) according to the second embodiment assumes within a housing 110, a rotor housing 120, a rotor 130, a fuel filter 140 (hereinafter referred to as a "filter" be characterized) and a motor section 150, further wherein a suction filter 180 is fixed to a lower portion of the housing 110 ; the pump 1 B is anor denbar within a fuel tank of a vehicle, not shown.

The housing 110 is essentially made of a cylindrical housing body 211 , the right and left ends of which are open in FIG. 4 (hereinafter referred to as “right” and “left” the right and left sides in FIG. 4, unless otherwise stated) . A drain cover 112 , which covers the left opening of the housing body 111 , a housing cover 113 , which covers the right opening of the housing body 111 and a cap 114 are seen before, which covers the opening of the housing cover 113 .

A cylindrical portion 111 a of the housing body 111 is made of a cylinder which is shaped so that part of the cylinder is cut along a plane parallel to an axis, the opening formed being closed by a flat plate 111 b; the axis is shown in FIG. 4 in a specific horizontal height position and in alignment with the flat plate 111 b, which forms a bottom plate.

The flat plate 111 b is covered by the suction filter 180 and a spacer 181 is arranged in an interior 182 of the suction filter 180 . The left edge of the cylindrical portion 111 a is in a front wall portion 111 d via which voltage has a circular Durchgangsöff c 111th A pump unit 200 and the filter 140 are arranged inside the housing body 111 . The pump unit 200 essentially comprises the drain cover 112 , the cap 114 , the rotor housing 120 , the rotor 130 , a motor shaft 151 , an armature 153 and a magnet 154 of the motor section 150 , and a body 210 which holds the rotor housing 120 with the cap 114 connects.

The body 210 is cylindrical in shape such that its right and left ends are open and is arranged in a horizontal height position such that its axis is coaxial with that of the housing body 111 . The body 210 has a thick portion 211 in the middle, and thin portions 212 and 213 extend from the right and left ends of the thick portion 211 .

The drain cover 112 and the rotor housing 120 are arranged in the left thin section 212 and the cap 114 is arranged in the right thin section 213 . The right and left openings of the body 210 are covered by the drain cover 112 , the rotor housing 120 and the cap 114 .

The rotor housing 120 is disc-shaped and its outer peripheral surface is in close contact with the inner peripheral surface of the thick portion 211 and the thin portion 212 and is then inserted into the body 210 . A through hole 121 is formed in the center of the rotor housing 120 and the hole 121 supports a bearing 158 which rotatably supports one end side of the motor shaft 151 . A rotor receiving recess 122 is formed in the middle of the left end surface of the rotor housing 120 , and the rotor 130 is fixed to one end of the motor shaft 151 which passes through the bearing 158 and is rotatably received in the rotor receiving recess 122 . A certain portion of the rotor receiving recess 122 forms a drain recess 123 .

The drain cover 112 is arranged so that it is adjacent to the left side of the rotor housing 120 and is attached to the body 210 so that the right Endoberflä surface of a base portion 112 a, which has a circular cross-section, in close contact with the left end surface the rotor housing 120 is brought and the outer peripheral surface of the base portion 112 a is brought into close contact with the inner peripheral surface of the thin portion 212 . A pump chamber 224 is defined between the drain cover 112 and the rotor housing 120 .

In the discharge cover 112, an engagement protrusion 112 b is of circular cross-section which is disposed on the left side of the base portion 12 a, in the opening 111 c of the front wall portion 111 d of the case body 111 inserted and the left end surface of the Basisab section 112 a is in brought close contact with the inner upper surface of the front wall portion 111 d. B on the left end surface of the engagement projection 112 is a discharge nozzle 112 c (fuel discharge port) to the left with an alignment before, so that its axis is horizontal, wherein the nozzle or orifice 112 c passes into the pump chamber, which is arranged on the Ablaßabvertiefung 123 .

A bearing mounting hole 112 d is disposed on the right end surface of the drain cover 112 , and a bearing 157 that takes up a drawer load of the motor shaft 151 is disposed in the bearing mounting hole 112 d.

The cap 114 is substantially cylindrical and includes a portion 114 a of large diameter that opens to the left end and a portion 114 b of small diameter that is closed at the right end. The cap 114 is attached to the body 210 so that the outer peripheral surface of the large diameter portion 114 a is brought into close contact with the inner peripheral surface of the thin portion 213 , and a front end portion of the thin portion 213 is cold worked radially inward (e.g. caulked, crimped, crimped, bent, etc.) so that the cap 114 is prevented from separating from the body 210 .

The cap 114 has a cylindrical bearing support 114 c and a holder 114 d within the portion 114 a large diameter and the portion 114 b small diameter sers. The bearing bracket 114 c carries a bearing 156 which rotatably supports the right end portion of the motor shaft 151 and the motor shaft 151 is rotatably supported by the bearing 156 and the bearing 158 so that its axis runs horizontally.

An armature 153 with a commutator 159 is fixed between the bearings 156 and 158 on the motor shaft 151 and a plurality of magnets 154 is fixed to the inner peripheral surface of the body 210 so that they the outer peripheral surface of the armature 153 at certain circumferential intervals opposite.

In this embodiment, a space enclosed by body 210 , the magnet 154 , the rotor housing 120 and the cap 114 forms a first fuel passage 221 (cooling passage), and the armature 153 is designed to rotate in the fuel, which flows in the first fuel passage 221 .

A brush 155 is mounted on the bracket 114 d via an Fe of 161 and the brush 155 is tensioned by the spring 161 in sliding contact with the commutator 159 . Furthermore, an energy supply connection 162 is fastened to the holder 114 d and is connected to the brush 155 .

At the closed end of the small diameter portion 114 b of the cap 114 , a connector nozzle 114 e forms a connection opening for an energy supply which projects to the right, and a power supply connection 162 passes through a closed portion 114 f in the center of the connector nozzle 114 e in a sealed manner .

The portion 114 b small diameter of the cap 114 is firmly inserted into an engagement opening 113 a in a sealed manner, which is defi ned in the housing cover 113 .

As described above, the pump unit 200 is fixedly received within the housing body 111 , a cavity section 220 having a substantially C-shaped cross section between the body 210 of the pump body 200 and the cylindrical section 111 a of the housing body 111 being formed and the cavity section 220 is equipped with the filter 140 , which is arranged so that the direction of flow of the fuel is horizontal.

A front wall portion 111 d of the housing body 111 has a plurality of stops 111 e, which extend horizontally in the direction of the right side within the cavity portion 220 with certain circumferential distances from each other. The end surface of the filter 140 stops at the tips of each stop 111 e.

An annular circumferential space, which is defined by the cylindrical portion 111 a of the housing body 111 , the housing cover 113 , the portion 114 b of the small diameter of the cap 114 and the right end portion of the filter 140, defines a second fuel passage 222 (bypass passage) and a space which is substantially C-shaped in cross section and from the cylindrical portion 111 a, the front wall portion 111 d, the left Endab section of the filter 140 and the body 210 of the pump inlet standardize 200 is defined, forms a third fuel passage 223 .

To ensure that the fuel always flows through the filter 140 when the fuel flows between the second fuel passage 222 and the third fuel passage 223 , the outer peripheral surface of the filter 140 is formed to be in close contact with the inner peripheral surface of the housing body 111 and the outer peripheral surface of the body 210 in the pump unit 200 . In other words, the housing body 111 includes a thick portion 111 f ( Fig. 4) with a cross section and dimensions corresponding to the outer surfaces of the lower end portions of the filter 140 and the outer peripheral surface of the lower portion of the body 210 in the flat Plate 111 b. As a result, the housing body 111 is quite complicated in its shape, the housing body 111 is preferably made of a plastic.

The pump IB also has a first fuel suction port 191 , which passes through the cylindrical portion 111 a of the housing body 111 and the body 210 of the pump unit 200 from the flat plate 111 b of the housing body 111 to the center of the left-hand lower portion to extend the first fuel passage 221 and two second fuel suction ports 192 which pass through the cylindrical portion 11 a from the flat plate 111 b to extend to the bottom portion of the second fuel passage 222 . These fuel intake openings 191 and 192 open into the interior 182 of the intake filter 180 .

The portion 114 b small diameter of the cap 114 has a connecting bore 201 , which enables the first fuel passage 221 to communicate with the second fuel passage 222 . Further, in the pump 1 B, a connecting bore 202 is provided which the thin portion 212 of the body 210 and the housing 120 passes through Rotorge, to bring the third fuel passage 223 in communication with the pump chamber 224th

In this pump 1 B, when the motor section 150 is operated and the rotor 130 is rotated, the fuel in the fuel tank passes through the suction filter 180 and is sucked through the first fuel suction opening 191 and the second fuel suction openings 192 into the housing 110 .

In this embodiment, it must explicitly be not imagines that 192 sucked fuel from the second fuel suction stoffdurchlaß directly into the second combustion flows 222nd In contrast, 191 sucked fuel flows from the suction port to he most side of the left end portion of the first fuel passage 221 and flows into the right end portion of the first fuel passage 221, where it flows around the periphery of the armature 153rd The fuel continues to flow through the connection bore 201 and flows into the second fuel passage 222 and is combined or combined here with the fuel that flows from the second fuel intake openings 192 .

The merged in the second fuel passage 222 passes through the filter 140 and flows into the third fuel passage 223 and further into the pump chamber 224 through the connection bore 202 , where the fuel from the rotating rotor 130 is increased in pressure (for example to about 3 kg / cm ² ) and is dispensed from there via the dispensing nozzle 112 c and conveyed to the fuel injection system, not shown.

In this embodiment, too, the intake filter 180 enables relatively large foreign bodies or impurities to be removed from the fuel, whereas the filter 140 further filters the fuel in order to remove fine foreign bodies, such as rust particles or the like, from the fuel. Furthermore, the first fuel passage 221 forms the cooling passage and the armature 153 rotates in the fuel flowing in the first fuel passage 221 , and since the engine section 150 is cooled by the fuel when it flows through the first fuel passage 121 , the engine section becomes 150 not overheated.

Upstream of the filter 140 is disposed Further, since in the pump 1 B, the motor portion 150, even if generated abrasion to the motor is mixed substance in the motor section 150, this abrasion or this foreign matter away from the fuel through the filter 140th

In the pump 1 B, the motor portion 150 and the filter 140 in the low pressure portion upstream of the rotor 30 are disposed and only the discharge cover 112 is arranged in the high-pressure section downstream of the rotor 130th As a result, in the pump unit 200, all the components are arranged in the section to the right of the rotor housing 120 and the sections outside the body 210 of the pump unit 200 are arranged in the low-pressure section or region.

As a result, the drain cover 112 and the rotor housing 120 , to which the pump starting pressure acts directly, must have a strength which can withstand this pressure and the material selection, the wall thicknesses etc. must be such that the necessary strengths are obtained. On the other hand, the housing body 111 , the housing cover 113 , the body 210 of the pump unit 200 and the cap 114 , to which the pump discharge pressure is not applied, need only a strength which can withstand the low pressure that prevails before the pressure is increased by the rotor 130 and the choice of materials, wall thicknesses, etc., which can withstand the lower pressure, can be made without major restrictions.

Since the area of the high pressure section is thus reduced in the pump 1 B and the area of the low pressure section is increased in comparison with the prior art, weight reductions and cost reductions can be achieved.

Furthermore, the sealing portions, which must withstand the pump discharge pressure, are only the abutting portion 118 of the right end surface of the outer edge portion of the drain cover 112 with the left end surface of the outer edge of the rotor housing 20 , as shown in Fig. 6. At the lay portion 119 a of the outer peripheral surface of the rotor housing 120 with the inner peripheral surface of the housing body 210 , the abutment portion 119 b of the outer peripheral surface of the drain cover 112 with the inner peripheral surface of the body 210 and the abutment portion 119 c of the outer peripheral surface of the drain cover 112 with the inner peripheral surface of the housing body 111 may have a sealing force or sealing force which only has to withstand the low pressure before it is increased or increased by the rotor 130 .

At the pump are thus 1 B according to the second exporting approximate shape as the pump 1 A according to the first exporting approximate shape, the number of high-pressure sealing portions and the sealing surfaces themselves in comparison to the prior art significantly reduced, whereby the possibility of the production of power to improve, reduce working hours and reduce costs.

As further described above, a path through which the fuel flows into the second fuel passage 222 immediately upstream of the filter 140 is a path in which the fuel flows through the first fuel passage 221 from the first fuel suction port 191 ( hereinafter referred to as "first passage") and a path in which the fuel flows directly from the second fuel intake ports 192 (hereinafter referred to as "second passage").

Since the first passage had a greater flow resistance for the fuel than the second passage, the greater proportion of the fuel flows through the second passage with low flow resistance and flows into the second fuel passage 222 and only the fuel with the minimum amount necessary for cooling the motor section 150 can flow in the first passage. As a result, the pressure loss upstream of the pump chamber 224 is kept low even when the fuel flows at a high rate, so that vapor locks are prevented from occurring.

The quantity ratio of fuel flowing in the first passage to that in the second passage is determined depending on how the opening area of the first fuel suction port 191 , the total opening area of the second fuel suction ports 192 , the opening area of the communication hole 201 , the cross-sectional configuration and the cross-sectional dimensions of the first Fuel passage 221 etc. are.

Furthermore, in the pump 1 B, the first fuel suction port 191 and the second fuel suction ports 192 and the connection hole 202 are arranged in deep positions, and further the pump unit 200 is arranged so that its axis is horizontal and the filter 140 is arranged so that the flow direction of the fuel in the circumference of the pump unit 200 is horizontal. With this arrangement, the suction head of the pump 1 B can be made significantly smaller and the fuel pump can be made compact.

According to the above description, a fuel thus has pump according to the present invention according to a first Aspect on: a housing with a fuel intake opening and a fuel drain opening; a rotor inside  half of the housing is arranged to run from the fuel suction opening to draw in fuel under pressure zen and around the fuel to the fuel drain opening promote; a motor section within the housing for rotatably driving the rotor; and a cooling passage leave inside the housing adjacent the motor section, to cool the motor section with the rotor flowing lower end of the housing near the fuel outlet is arranged. With this construction, the engine can be arranged in the low pressure area, the high Printing section or area can be on a very small area be limited and the high pressure sealing section can be reduced, which gives the possibility of a To get fuel pump which is smaller, lighter and is cheaper.

As described above, after a second Aspect of the present invention, a fuel pump create with a housing with a fuel intake with a fuel intake and a force discharge opening; a rotor inside the housing for Pressurizing fuel from the fuel was sucked in to the fuel to the Promote fuel drain opening; an engine section in within the housing for rotatably driving the Ro tors; adjacent a cooling passage within the housing the motor section for cooling the motor section; and egg nem fuel filter inside the housing, the Mo gate section, the fuel filter and the rotor in the ge called order in the housing from an upstream arranged towards a downstream side net, the rotor at the downstream end within the Housing arranged adjacent to the fuel drain opening is arranged, a bypass passage within the housing which bridges the cooling passage, and the housing one Has a plurality of fuel intake openings, of which part to an inlet of the fuel filter through the  Cooling passage leads and others thereof to the inlet of the Pass the fuel filter over the bypass passage.

With this structure, the motor section and the Fuel filters are placed in the low pressure area, the high pressure section or area can be on a very small area can be limited and the high pressure seal cut can be reduced, making it possible to egg to get a fuel pump, which is smaller, lighter and is cheaper. The pressure loss at the An suction side of the pump can be reduced and vapor bubble stop can be prevented.

Finally, according to the description above and according to a third aspect of the present invention Fuel pump created with: a housing with a Fuel intake opening with a fuel intake opening and a fuel drain opening; a rotor inside the Housing for pressurizing fuel from the Fuel intake port was drawn to the fuel to promote the fuel drain opening; an engine cut within the housing for the rotating movement ben of the rotor; a cooling passage inside the housing adjacent to the motor section for cooling the motor section tes; and a fuel filter inside the case where at the fuel intake opening downstream of the housing is arranged, the fuel filter is arranged so that he on one side opposite the fuel intake opening is ordered and at least part of the rotor and Motor section surrounds and arranged in one orientation is that a flow direction of the fuel within the fuel filter is substantially horizontal, and the rotor at the downstream end inside the housing is arranged adjacent to the fuel discharge opening.

With this structure, the motor section and the Fuel filters are placed in the low pressure area,  the high pressure section or area can be on a very small area can be limited and the high pressure seal cut can be reduced, making it possible to egg to get a fuel pump, which is smaller, lighter and is cheaper. Furthermore, the suction head of the Pump can be reduced in size and the pump as a whole can be made pact.

The foregoing description of preferred embodiments forms of the invention is purely illustrative and illustrative to consider lend. They are intended to be the subject of the invention do not restrict to the described embodiments and modifications and modifications are within the scope of the obi possible without teaching of the subject of the present Er deviate.

Claims (4)

1. A fuel pump with:
a housing ( 10 ) with a fuel intake opening ( 12 a) and a fuel discharge opening ( 13 a);
a rotor ( 30 ), which is arranged within the housing ( 10 ) to pressurize fuel drawn in from the fuel suction opening ( 12 a) and to deliver the fuel to the fuel discharge opening ( 13 a);
a motor section ( 50 ) within the housing ( 10 ) for rotatably driving the rotor ( 30 ); and
a cooling passage (60) within the housing (10) adjacent the motor section (50) to cool the motor section (50),
wherein the rotor ( 30 ) at the downstream end of the Ge housing ( 10 ) near the fuel drain opening ( 13 a) is net angeord. 2. Fuel pump according to claim 1, further with egg nem fuel filter ( 40 ) upstream of the rotor ( 30 ) within the housing ( 10 ). 3. A fuel pump with:
a housing ( 210 ) with a fuel suction opening ( 210 ) with a fuel suction opening ( 191 , 192 ) and egg ner fuel outlet opening ( 112 c);
a rotor ( 130 ) within the housing ( 110 ) for pressurizing fuel that has been drawn from the fuel intake port ( 191 , 192 ) to deliver the fuel to the fuel discharge port ( 112 c);
a motor section ( 150 ) within the housing ( 110 ) for rotatably driving the rotor ( 130 );
a cooling passage within the housing ( 110 ) be adjacent to the motor section ( 150 ) for cooling the Motorab section ( 150 ); and
a fuel filter ( 140 ) within the housing ( 110 ),
wherein the engine section ( 150 ), the fuel filter ( 140 ) and the rotor ( 130 ) are arranged in the order in the housing from an upstream side towards a downstream side,
the rotor ( 130 ) is arranged at the downstream end inside the housing adjacent to the fuel discharge opening ( 112 c),
a bypass passage is arranged within the housing ( 110 ) which bridges the cooling passage, and
the housing ( 110 ) has a plurality of fuel intake openings ( 191 , 192 ), some of which lead to an inlet of the fuel filter ( 140 ) through the cooling passage and others thereof to the inlet of the fuel filter via the bypass passage. 4. A fuel pump with:
a housing ( 210 ) with a fuel suction opening ( 210 ) with a fuel suction opening ( 191 , 192 ) and egg ner fuel outlet opening ( 112 c);
a rotor ( 130 ) within the housing ( 110 ) for pressurizing fuel that has been drawn from the fuel intake port ( 191 , 192 ) to deliver the fuel to the fuel discharge port ( 112 c);
a motor section ( 150 ) within the housing ( 110 ) for rotatably driving the rotor ( 130 );
a cooling passage within the housing ( 110 ) be adjacent to the motor section ( 150 ) for cooling the Motorab section ( 150 ); and
a fuel filter ( 140 ) within the housing ( 110 ),
wherein the fuel intake opening ( 191 , 192 ) is arranged downstream of the housing ( 110 ),
the fuel filter ( 140 ) is arranged so that it is arranged on one side opposite the fuel suction opening ( 191 , 192 ) and surrounds at least a part of the rotor ( 130 ) and the motor section ( 150 ) and is arranged in an orientation such that a flow direction of the fuel within the fuel filter ( 140 ) is substantially horizontal, and
the rotor is arranged at the downstream end within the housing ( 110 ) adjacent to the fuel discharge opening ( 112 c).