JP2017025847A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components of a fuel supply device, to improve assembling workability, to reduce costs, and further to suppress degradation of pumping performance by effectively preventing leakage of a high-pressure fuel from a discharge pipe outlet.SOLUTION: A housing H in which at least a part of a pump unit U is integrally embedded, is molded while applying the pump unit U as an insert component, the housing H integrally comprises a discharge cylindrical portion Ho having a fuel discharge port Hoa connected to a pipe outlet Coa of a discharge pipe Co of the pump unit U at a tip thereof, covering the discharge pipe Co, and connectable with an external pipe, and a wiring coating portion Ht coating motor operation wirings T1-T3 and shielding the same from the external. At least a part of the discharge cylindrical portion Ho surrounds an outer periphery of the discharge pipe Co in a close contact state over the whole periphery, and the wirings T1-T3 are extended from a unit case C of the pump unit U at a side opposite to the pipe outlet Coa of the discharge pipe Co through the surrounding portion.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a fuel supply device, and more particularly, to a fuel supply device including a pump unit that combines a fuel pump capable of sucking and discharging fuel in a fuel tank and a motor capable of driving the fuel pump.

  Conventionally, as such a fuel supply device, for example, as disclosed in FIG. 3 of Patent Document 1 below, a pump unit (cylindrical yoke 65 and its inner element) in which a motor and a fuel pump are combined can be divided into two parts. And an oil discharge part (opening 92 of the cover 83) provided in the pump unit, and a discharge cylinder part (discharge port) for connecting an external pipe projecting from the case 93) are communicated with each other via a space between the casing and the pump unit (fuel circulation space 91).

JP 2001-280211 A

  As in the above-described conventional apparatus, the basic structure of the pump unit is the same as the structure in which the discharge pipe portion for connecting the external pipe (93) independent of the fuel discharge portion (92) of the pump unit is provided on the housing (62). Although there is an advantage that the discharge pipe portion (93) for external pipe connection can be designed with a high degree of freedom without being changed, there is the following problem.

  That is, since the fuel circulation space (91) is interposed between the discharge cylinder portion (93) on the housing side and the fuel discharge portion (92) on the pump unit side, in order to prevent external leakage of high-pressure fuel in the space. The device is specially required. In the conventional apparatus, the wiring (terminal 87) extending from the motor extends outside the casing through the fuel circulation space (91), and the casing outer wall around the extending portion receives a large fuel pressure. Therefore, the high pressure fuel is likely to leak out of the casing through the wiring 87, and the fuel leakage may adversely affect the performance of the fuel pump.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel supply device that can solve the above problem with a simple structure.

  In order to achieve the above object, the present invention provides a fuel supply apparatus including a pump unit that combines a fuel pump capable of sucking and discharging fuel in a fuel tank and a motor capable of driving the fuel pump. A housing in which at least a part of the pump unit is embedded is molded using the pump unit as an insert part, and the pump unit receives at least the unit pump housing the fuel pump and high-pressure fuel from the fuel pump. A discharge pipe projecting from the unit case to enable discharge, and a wiring for operating the motor is provided outside the unit case and the discharge pipe, and the casing includes the discharge pipe A discharge cylinder portion having a fuel discharge port connected to the tube outlet of the tube and covering the discharge tube, to which an external pipe can be connected, and the wiring The discharge tube portion is integrally provided with a wiring covering portion that is covered and shielded from the outside, and at least a part of the discharge tube portion surrounds the outer periphery of the discharge pipe in a tightly-fitted state and sandwiches the surrounding portion. The first feature is that the wiring extends from the unit case on the side opposite to the outlet of the discharge pipe.

  According to the present invention, in addition to the first feature, the discharge pipe is connected to the first pipe part on the unit case side and a front part of the first pipe part via a step. A second pipe part having a smaller diameter than the part, and the discharge cylinder part surrounds each outer periphery of the first and second pipe parts of the discharge pipe in close contact with each other over the entire circumference. Two features.

  According to the present invention, in addition to the first or second feature, the wiring detects a predetermined operation state of the engine and outputs a signal corresponding to the operation state as a signal for controlling the operation of the motor. It is connected to an electronic control board on which at least a part of the sensor is mounted, and at least a part of the sensor and the electronic control board are embedded in the casing together with the pump unit by molding the casing. Three features.

  The present invention is also a fuel supply device having any one of the first to third features for pumping high-pressure fuel to a fuel injection valve provided in an engine, wherein the wiring is based on an operating state of the engine. Connected to an electronic control unit that calculates the fuel injection amount of the fuel injection valve and controls the operation of the fuel injection valve based on the calculation result, and the electronic control unit performs the molding by molding the casing. A fourth feature is that it is embedded in the casing together with the pump unit.

  According to the first aspect of the present invention, the housing of the fuel supply device is molded using the pump unit in which the motor and the pump are combined as an insert part, and the housing is connected to the outlet of the discharge pipe of the unit case. A discharge cylinder part for connecting an external pipe having an outlet at the tip and covering the discharge pipe, and a wiring cover part for covering the motor case wiring outside the unit case and the discharge pipe and shielding from the outside Therefore, the pump unit combined with the motor and the fuel pump and the wiring for operating the motor can be embedded and integrated in the housing simultaneously with the molding of the housing, thereby reducing the number of parts and assembling workability. This can contribute to cost savings. In addition, since the external pipe connection discharge cylinder part can be integrally formed with the housing without changing the basic structure of the pump unit including the discharge pipe, the discharge cylinder part can be easily designed with a high degree of freedom.

  In addition, at least a part of the discharge tube part surrounds the outer periphery of the discharge pipe in a tightly-fitted state, and the wiring extends from the unit case on the opposite side of the discharge pipe from the discharge pipe outlet. Therefore, a double pipe structure is formed by the discharge cylinder part on the housing side and the discharge pipe on the pump unit side. From the outlet of the discharge pipe, the boundary part between the discharge pipe and the discharge cylinder part (by extension, the unit case) The high-pressure fuel can be effectively prevented from leaking through the boundary between the housing and the housing and the boundary between the wiring and the housing, and the pump performance can be prevented from being lowered due to the fuel leakage. Moreover, the double pipe structure can effectively increase the rigidity strength of both the discharge pipe and the discharge cylinder.

  In particular, according to the second feature, the discharge pipe has a first pipe part having a large diameter and a second pipe part having a small diameter connected to a tip part of the first pipe part through a step, Since the discharge cylinder part surrounds the outer circumferences of the first and second pipe parts in close contact with each other over the entire circumference, the above-mentioned step is provided between the outer circumference of the discharge pipe and the discharge cylinder part surrounding and covering the discharge pipe part. The entire circumference can be sealed at two locations (first and second pipe portions) sandwiched between them, so that the sealing performance is enhanced, and therefore it is possible to more effectively prevent high-pressure fuel from leaking between them. In addition, the presence of a step between the first and second tube portions can effectively avoid the deformation of one tube portion due to an external force to the other tube portion, so that the sealing effect can be obtained more reliably. .

  In particular, according to the third feature, the wiring includes at least a part of a sensor that detects a predetermined operation state of the engine and outputs a signal corresponding to the operation state as a signal for controlling the operation of the motor. The sensor is connected to the mounted electronic control board, and at least a part of the sensor and the electronic control board are embedded in the casing together with the pump unit by molding the casing. Intrusion into the control board can be effectively prevented. In addition, the housing can be molded by filling the pump unit and sensor-equipped electronic control board at the same time, so the number of parts and assembly man-hours can be reduced, and the wiring of the pump unit, sensor, and electronic control board is consolidated. This will save further costs.

  Further, particularly according to the fourth feature, the wiring is connected to an electronic control unit that calculates the fuel injection amount of the fuel injection valve based on the operating state of the engine and controls the operation of the fuel injection valve based on the calculation result. Since the electronic control device is connected and embedded in the housing together with the pump unit by molding the housing, high-pressure fuel can be effectively prevented from entering the electronic control device through the wiring. In addition, since the housing can be molded by filling the pump unit and the electronic control unit at the same time, the number of parts and assembly man-hours can be reduced, and the wiring of the pump unit and the electronic control unit can be consolidated. Cost savings.

1 is a perspective view showing an embodiment of an engine intake system in which the fuel supply apparatus according to the present invention is mounted on a throttle body, as viewed from the intake upstream side of the throttle body. (A) is a partially broken side view showing the intake system (a view taken in the direction of arrow 2 (A) in FIG. 1), and (B) is a pump unit / wiring / electronic control unit before the casing is molded. Side view of the assembly (insert part) from the same direction as FIG. 2 (A) and enlarged vertical sectional view of the pump unit Front view of the intake system as viewed from the intake downstream side of the throttle body (as viewed from arrow 3 in FIG. 2A) (A) is an enlarged view showing a part of the part indicated by arrow 4 (A) in FIG. 3, and (B) is a combination of a pump unit, a wiring, and an electronic control unit before the casing is molded. Single unit view of the assembly as seen from the same direction as Fig. 4 (A).

  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  First, in FIG. 1, an engine (not shown) mounted on a vehicle, for example, a motorcycle, includes a fuel injection valve FV that can inject fuel into its combustion chamber or an intake passage (for example, an intake port or an intake pipe) connected thereto. A fuel supply device A for pumping and supplying high-pressure fuel to the fuel injection valve FV is fixed adjacent to one side of a throttle body B as a support. Note that the fuel supply device A is fixed adjacent to one side of the throttle body B in this manner, so that the high-pressure side external pipe (fuel conduit 42 described later) from the fuel supply device A to the fuel injection valve FV can be shortened. Figured.

  In this throttle body B, an intake passage 1 constituting a part of the intake system of the engine is formed penetrating in a horizontal direction or a direction slightly inclined from a horizontal plane. A butterfly throttle valve 2 capable of adjusting the intake air flow rate by opening and closing the intake passage 1 is rotatably supported by the throttle body B via a throttle valve shaft 3 fixed to the intake passage 1 and traversing the intake passage 1. The

  One end portion 3a of the throttle valve shaft 3 extends on the side wall portion of the throttle body B on one side of the intake passage 1, and the end portion 3a is provided by the driver via a Bowden cable (not shown). A throttle drum 4 that is remotely operated is mounted, and a return spring 5 that biases the throttle valve 2 in the valve closing direction is connected.

  Further, the other end portion 3 b of the throttle valve shaft 3 extends on the side wall portion of the throttle body B on the other side across the intake passage 1. Then, the stepped cylindrical connecting tube portion 6 (see FIGS. 3 and 4) surrounding the other end portion 3 b and the fuel supply device A are fastened with a plurality of bolts 7 at a plurality of locations around the connecting tube portion 6. A plurality of mounting boss portions (first to third mounting bosses 31 to 33 described later) are integrally formed on the side wall portion of the throttle body B on the other side. The connecting cylinder portion 6 and the mounting boss portions 31 to 33 are used for mounting the fuel supply device A on the side wall portion of the throttle body B on the other side, as will be described later.

  In addition, the fuel supply device A includes a fuel pump P that can suck and discharge the fuel in the fuel tank T and a pump drive motor M that can rotationally drive the fuel pump P in a common unit case C, and are integrally integrated. An electronic control unit ECU as an electronic control unit electrically connected to the pump unit U, the motor M and the fuel injection valve FV and capable of controlling the operation of the M and FV, and the pump unit U and the electronic control unit ECU are inserted. The main part is a casing H made of an insulating synthetic resin that is molded as a part. In this embodiment, a brushless motor is used as the pump driving motor M.

  The pump unit U and the electronic control unit ECU include a housing together with first to third wirings T1 to T3 connecting them and a part of a sensor (throttle opening sensor SEt in the illustrated example) for detecting the operating state of the engine It is embedded in the housing H by H molding. As a result, the whole can be handled as a single part, the number of parts and the number of assembling work can be reduced, and the workability during engine assembly and maintenance work is improved.

  The electronic control unit ECU is made of an insulating synthetic resin in which a flat electronic control board EP, the electronic control board EP, IC chips 9 and 10 connected and fixed thereto, a part 16 of the sensor SEt, etc. are embedded integrally. The flat cover body UC is the main part. The cover body UC covers and protects almost all of the electronic control board EP and the IC chips 9 and 10 connected thereto and the sensor SEt and the like. A connecting cylinder portion 8 having an elliptical cross section is integrally formed on one side portion of the cover body UC, and an edge portion EPc of the electronic control board EP is formed in an inner space of the connecting cylinder portion 8. Is exposed.

  The end edge portion EPc has a large number of conductive leads exposed on the surface thereof in an aligned state, and functions as a connector terminal portion for detachably connecting the electronic control board EP to an external electric device. The connecting cylinder portion 8 functions as a male coupler in cooperation with the end edge portion EPc, and a wire extending from various external electric devices (for example, a fuel injection valve FV, a sensor, etc.). A female coupler at one end of the harness, that is, an external connector is fitted and connected so that it can be inserted and removed.

  The electronic control board EP controls the operation of the pump driving motor M based on output signals from various sensors (for example, a throttle opening sensor SEt, an intake pressure sensor, an intake air temperature sensor, etc., which will be described later) that detect the operating state of the engine. Driver circuit D for detection, detection circuit part SEr for detecting the rotor rotation position from the waveform of the induced voltage generated as the rotor of the brushless motor M rotates, and output signals of the various sensors for detecting the operating state of the engine. And a fuel injection valve controller 9 that calculates the fuel injection amount of the fuel injection valve FV based on the calculation result and controls the operation of the fuel injection valve FV based on the calculation result.

  In the illustrated example, the calculation function of the fuel injection valve control section 9 is executed by a dedicated IC chip connected and fixed to the electronic control board EP, and the calculation functions of the driver section D and the detection circuit section SEr are the electronic control board. Processed and executed by another IC chip 10 connected and fixed to the EP.

  In the IC chip 10, the motor M is driven and controlled by the driver unit D performing energization control to the stator coil group 28 of the brushless motor M based on the rotor rotational position information detected by the detection circuit unit SEr. The Instead of such a rotor position detection means (detection circuit unit SEr) outside the motor M, a non-contact type rotor position detection means (for example, a hall sensor) built in the motor M may be used.

  The electronic control board EP includes a sensor that detects a predetermined operating state of the engine and outputs a detection signal to the electronic control board EP, for example, an opening sensor SEt that detects the opening degree of the throttle valve 2 and an intake pressure (not shown). A sensor and an intake air temperature sensor are connected.

  In particular, the opening sensor SEt is a non-contact type sensor in the present embodiment, for example, a permanent magnet 15 fixed to the end of the throttle valve shaft 3, and an electronic control board EP mounted on the electronic control board EP so as to face the permanent magnet 15, The permanent magnet 15 (and hence the throttle valve 2) is constituted by a hall element 16 that can detect the rotational displacement of the permanent magnet 15 as a magnetic flux change in a non-contact manner. The Hall element 16 is directly connected and fixed to the electronic control board EP in this embodiment, and is embedded in the cover body UC together with the electronic control board EP by molding the cover body UC.

  The intake pressure sensor and the intake air temperature sensor are attached to the throttle body B so that the intake negative pressure and the intake air temperature on the downstream side of the throttle valve 2 of the intake passage 1 of the throttle body B can be detected, for example. The sensors and the electronic control board EP are connected via external wiring (that is, the wire harness and the male / female coupler).

  As for the intake pressure sensor and the intake air temperature sensor, at least a part of each sensor is directly connected and fixed to the electronic control board EP in the same manner as the hall element 16 of the opening degree sensor SEt, and is fixed to the cover body UC. Alternatively, at least a part of each sensor may be embedded in the housing H and electrically connected to the electronic control board EP through the housing H and the cover body UC. In either case, it is necessary to provide a sensor intake air introduction path in the throttle body B or the housing H for applying the intake pressure or the intake air temperature to the detection portion of each sensor.

  As shown in FIG. 2B, the pump unit U pumps the fuel pump P by driving a hollow unit case C, a fuel pump P built in the unit case C, and the fuel pump P. A brushless motor M built in the unit case C is provided for operation. In particular, by adopting a brushless motor as the pump drive motor M, the pump unit U can be downsized, and the fuel supply apparatus A including the pump unit U as a whole can be downsized.

  The fuel pump P has an impeller 17 as a pump rotor that has a large number of radial grooves on the outer periphery and is directly connected to the motor M, and an annular pump chamber 18 that faces the outer periphery of the impeller 17. And a pump housing 19 for rotatably housing the impeller 17, and this pump structure is the same as that of a conventionally known vortex turbine pump (cascade pump). The pump housing 19 is divided into an outer half body 19o and an inner half body 19i adjacent to each other in the pump axis direction, an impeller 17 is interposed between the two half bodies 19o and 19i, and a pump chamber 18 is provided. Defined.

  The unit case C has a cylindrical unit case main body Cm whose both ends are opened as a main part, and an open end on one side of the unit case main body Cm is closed by the pump housing 19 fitted thereto. The open end on the other side is closed by a blocking wall 20 fitted thereto. The pump housing 19 and the closing wall 20 are fixed to the unit case main body Cm by connecting both ends of the unit case main body Cm with appropriate fixing means (in the illustrated example, caulking with respect to both ends). Thus, the unit case C is constituted by the unit case main body Cm, and the pump housing 19 and the blocking wall 20 that close both ends of the unit case main body Cm.

  Further, a suction port 24 and a discharge port 25 are formed in the outer half 19o and the inner half 19i of the pump housing 19, respectively. Further, in particular, the outer half body 19o is integrally provided with a cylindrical suction pipe Ci projecting outwardly, and a deaeration hole 19oh for discharging bubbles generated by the pump action in the pump housing 19 is formed. The suction pipe Ci communicates directly with the suction port 24.

  The brushless motor M has both end walls of the unit case C, that is, a motor shaft 26 that is rotatably supported by the closing wall 20 and the pump housing 19 via bearings, and an outer periphery of an intermediate portion of the motor shaft 26. The fixed permanent magnet 27 and at least one set of three-phase (ie, U-phase, V-phase, W-phase) stator coil groups 28 fixed to the inner periphery of the unit case main body Cm so as to surround the permanent magnet 27. The impeller 17 is coupled to the motor shaft 26 as a main part. A fuel passage 29 is formed between the permanent magnet 27 and the stator coil group 28 to allow the discharge port 25 to communicate with the fuel outlet space 20a in the closed wall 20.

  The blocking wall 20 is integrally provided with a cylindrical discharge pipe Co for discharging high-pressure fuel when the pump is operated. Inside the discharge pipe Co, a pipe at the tip of the discharge pipe Co from the fuel outlet space 20a is provided. A check valve V for preventing backflow that allows the flow of the discharged fuel only to the outlet Coa side is housed. Further, in the blocking wall 20, base portions of three pump unit side wiring portions ta1 to ta3 connected to the respective coils of the stator coil group 28 via lead wires are embedded integrally with the lead wires. The tip portions of the pump unit side wiring portions ta1 to ta3 extend linearly in the direction along the axis of the motor shaft 26, and at the apexes of the triangle as seen on the projection plane (FIG. 4) orthogonal to the axis. It is distributed so as to be located. These pump unit side wiring parts ta1 to ta3 constitute a part of first to third wirings T1 to T3 as described later.

  In the illustrated example, the discharge pipe Co is formed in a stepped cylindrical shape from a large-diameter first pipe section 11 on the base side and a small-diameter second pipe section 12 connected to the tip of the first pipe section 11. An annular step 13 is interposed between the first and second pipe portions 11 and 12.

  The housing H covers the entire surface of the electronic control unit ECU except for the connecting cylinder portion 8 on one side of the cover body UC (that is, in a state where the connecting cylinder portion 8 is exposed so as to be inserted and removed from the external connector). The control unit covering portion He, the cylindrical pump unit covering portion Hc covering the outer peripheral surface and both end walls of the unit case C of the pump unit U, and the tip inlet Cia of the suction pipe Ci protruding from the outer end surface of the pump housing 19 A suction pipe covering portion Hi having a fuel suction port Hio that extends from the one end surface of the pump unit covering portion Hc so as to cover the suction pipe Ci, and a deaeration hole 19oh opening at the outer end surface of the pump housing 19 A discharge pipe Co having a deaeration pipe 30 communicating directly with the pump housing 19 and integrally protruding from the outer surface of the pump housing 19 and a fuel discharge port Hoa connected to the tip outlet Coa of the discharge pipe Co At least a discharge pipe covering portion Ho that extends integrally from the other end surface of the pump unit covering portion Hc to cover and a wiring covering portion Ht that covers the first to third wires T1 to T3 and shields them from the outside. . The deaeration pipe 30 communicates with the fuel tank T via a conduit (not shown).

  Since the pump unit covering portion Hc of the present embodiment is formed into a cylindrical shape along the outer peripheral surface and both end walls of the cylindrical unit case C of the pump unit U covered by the pump unit covering portion Hc, the outer shape is not only simple and compact, Good flow of molten resin during molding. For this reason, the adhesion between the unit case C and the pump unit covering portion Hc is improved, and the fuel is difficult to leak to the suction pipe Ci side through the boundary portion between the two. Further, the pump unit U is compactly arranged so that the longitudinal direction thereof, that is, the axial direction of the motor M is along the intake passage 1 of the throttle body B.

  Further, in this embodiment, when viewed from the pump unit covering portion Hc, the discharge pipe covering portion Ho is located on the downstream side (left side in FIG. 2) in the direction along the intake passage 1 of the throttle body B, and the upstream side (right side in FIG. 2). The suction pipe covering portion Hi and the deaeration pipe 30 are respectively arranged. According to this arrangement, the external pipe 42 connected to the discharge pipe covering portion Ho and going to the fuel injection valve FV is shortened, and the external pipe 41 connected to the suction pipe covering portion Hi and going to the fuel tank T is connected to the discharge pipe covering portion Ho. It can be as far away from the hot engine as possible.

  Further, the wiring covering portion Ht of the present embodiment also has a function as a connecting wall that integrally couples the electronic control unit covering portion He with the pump unit covering portion Hc and the discharge pipe covering portion Ho. And the 1st, 2nd to-be-attached part as an attaching part for attaching the upper part of the housing | casing H to the throttle body B is attached to the one end part and other end part of the wiring coating | coated part Ht in the direction along the axis line of the fuel pump P. The parts 21 and 22 are integrally connected to each other. The first attached portion 21 is integrally connected to the discharge pipe covering portion Ho and the electronic control unit covering portion He, and the second attached portion 22 is also integrally connected to the pump unit covering portion Hc. Further, a third attached portion 23 as an attachment portion for attaching the lower portion of the housing H to the throttle body B is formed at the lower portion of the housing H so as to be integrally connected to the electronic control unit covering portion He. The

  Between these first to third attached bosses 21 to 23, a cylindrical connected cylinder part 34 for receiving the end 3 b of the throttle valve shaft 3 is provided on the surface of the housing H facing the throttle body B. Is integrally projected. A plurality of plate-like reinforcing ribs 35 that integrally connect between the outer peripheral surface and the facing surface of the housing H are radially and integrally provided on the outer peripheral surface of the connected cylindrical portion 34. Further, a small diameter portion 34a on the electronic control unit ECU side and a large diameter portion 34c on the throttle body B side connected to the small diameter portion 34a via an annular step portion 34b are formed on the inner peripheral surface of the connected cylindrical portion 34. Is done.

  On the other hand, the throttle body B has first to third mounting bosses 31 to 33 which are brought into contact with end surfaces of the first to third mounted portions 21 to 23 of the housing H, respectively, and the first to third mounting bosses. Between the mounting bosses 31 to 33, the connecting cylinder portion 6 surrounding the end portion 3b of the throttle valve shaft 3 is integrally formed. A large-diameter cylindrical portion 6a on the throttle body B side and a small-diameter cylindrical portion 6c connected to the large-diameter cylindrical portion 6a via an annular step portion 6b are formed on the outer peripheral surface of the connecting cylindrical portion 6.

  The connecting cylinder portion 6 is inserted into the connected cylinder portion 34 of the housing H when the fuel supply device A is attached to the throttle body B. In the inserted state, the large-diameter cylindrical portion 6a and the small-diameter cylindrical portion 6c are respectively fitted into the large-diameter portion 34c and the small-diameter portion 34a on the inner periphery of the connected cylindrical portion 34, and further inside the annular step portion 6b and the connected cylindrical portion 34. An annular seal member 36 is interposed between the peripheral annular step 34b. Thus, since the open end of the connection tube portion 6 is airtightly closed by the housing H (particularly the electronic control unit covering portion He), a dedicated closing means for closing the open end is unnecessary, and the structure can be simplified. Figured.

  Furthermore, in the fitting state of the connecting tube portion 6 and the connected tube portion 34, the first to third mounted portions 21 to 23 and the first to third mounting bosses 31 to 33 are placed in contact with each other. In this state, the casing H and thus the fuel supply device A is throttled by the bolts 7 that pass through the first to third mounted portions 21 to 23 and are screwed to the first to third mounting bosses 31 to 33, respectively. Fastened to and detachable from B.

  Thus, the electronic control unit covering portion He, the pump unit covering portion Hc, the suction pipe covering portion Hi, the deaeration pipe 30, the discharge pipe covering portion Ho and the wiring covering portion Ht, and the first to third attached portions 21 are provided. ˜23 and the to-be-connected cylinder portion 34 with the rib 35 are integrally formed simultaneously by the molding of the housing H.

  The discharge pipe covering portion Ho surrounds the outer periphery of the discharge pipe Co in a close contact state over the entire circumference and the entire surface by the molding of the housing H, and the outlet of the discharge pipe Co is sandwiched between the surrounding portions. The pump unit side wiring portions ta1 to ta3 extend from the end wall 20 of the unit case C on the opposite side to Coa. In the present embodiment, the discharge pipe Co is composed of the first pipe part 11 having a large diameter as described above, and the second pipe part 12 having a small diameter connected to the front part of the first pipe part 11 via a step 13. The discharge pipe covering portion Ho of the casing H that covers the stepped cylindrical shape has the outer circumferences of the first and second pipe portions 11 and 12 of the discharge pipe Co all around the entire surface. It is molded so as to be surrounded in a close contact state.

  By the way, outside the unit case C and the discharge pipe Co in the pump unit U, the first to third wires T1 to T3 for operating the motor M are routed. The first to third wirings T1 to T3 are connected to the motor M and have their outer end portions extending from one end surface of the unit case C, and the pump unit side wiring portions ta1 to ta3 and the pump unit side wiring portions ta1. Intermediate wiring portions tb1 to tb3 whose one end is connected to the outer end portion of ˜ta3 via a connection portion ju, and the inner end portion is connected to the other end portion of the intermediate wiring portions tb1 to tb3 via a connection portion jd. Electronic control unit side wiring parts tc1 to tc3 to be connected are provided.

  Each of the intermediate wiring portions tb1 to tb3 includes an upper portion tbu that extends downward from the pump unit side wiring portions ta1 to ta3 and a lower portion tbd that continues to the upper portion tbu. Each lower part tbd is bent from the upper part tbu to the motor M side and bent horizontally along the motor axis, and is bent from the first lower part to the side away from the motor axis. The second lower portion extending horizontally is formed in an L shape in plan view (see FIG. 4).

  The outer ends of the electronic control unit side wiring portions tc1 to tc3 are connected to the electronic control board EP of the electronic control unit ECU, and the connection portion and a part of the electronic control unit side wiring portions tc1 to tc3 are The cover body UC of the electronic control unit ECU is molded into the cover body UC together with the electronic control board EP.

  By the way, each wiring part ta1-ta3, tb1-tb3, tc1-tc3 which divides and comprises the 1st-3rd wiring T1-T3 is each formed from the electrically conductive metal strip which has rigidity. In particular, one end portion and the other end portion of the intermediate wiring portions tb1 to tb3 are folded back so that both widthwise side portions are wound in a cross-sectional arc shape, thereby constituting the lower connection portions ju and jd. The connecting portions ju, jd have two ends in which the outer end portions of the pump unit side wiring portions ta1 to ta3 and the inner end portions of the electronic control unit side wiring portions tc1 to tc3 are orthogonal to each other (that is, the pump unit side wiring portion ta1). ˜ta3 is fitted and pressed in such a manner that it can be inserted and removed in a direction along the motor axis, and the electronic control unit side wiring portions tc1 to tc3 are horizontally crossed over the motor M). Since the upper and lower connection portions ju, jd are such a connection / disconnection type connection structure, not only the insertion / removal operation is easy, but also the wear of the connection portion is effective.

  In this way, the first to third wirings T1 to T3 are divided from the three wiring elements (ta1 to ta3, tb1 to tb3, tc1 to tc3), and the intermediate wiring elements (tb1 to tb3) are arranged on the motor side. The following advantages can be obtained by connecting the wiring elements (ta1 to ta3) and the wiring elements (tc1 to tc3) on the electronic control unit ECU side so as to be detachable in two different directions. For example, an assembly (insert part) in which the pump unit U and the electronic control unit ECU are coupled via the first to third wirings T1 to T3 is set in the mold cavity before the housing H is molded. Thus, the relative positions of the wiring portions ta1 to ta3 extending from the pump unit U side and the wiring portions tc1 to tc3 extending from the electronic control unit ECU side of the first to third wirings T1 to T3 are somewhat due to an assembly error or the like. Even if the positional deviation occurs, the wiring portions ta1 to ta3 and tc1 to tc3 can be connected without difficulty through the intermediate wiring portions tb1 to tb3 while absorbing the positional deviation without difficulty.

  In addition, at least a part of the wirings T1 to T3, in the illustrated example, the upper part tbu of the intermediate wiring parts tb1 to tb3 and the facing surface between the wiring covering part Ht surrounding the outer periphery of the upper part tbu, A closing member S is provided which is in close contact with each of the opposing surfaces over the entire circumference and can prevent the fuel from being discharged through the wirings T1 to T3. As the closing member S, a material having flexibility and adhesiveness, for example, a solvent-type adhesive called a primer (for example, nitrile rubber) is used.

  Before the casing H is molded, the closing member S is applied to the outer peripheral portion of a part of the wirings T1 to T3 (the upper part tbu of the intermediate wiring parts tb1 to tb3 in the illustrated example) over the entire periphery. The processed wirings T1 to T3 become insert parts together with the electronic control unit ECU and the like, and the housing H is molded. In addition, as a constituent material of the closing member S, a material having a melting point and heat resistance that does not melt or change in the process of molding the housing H is desirable.

  The wirings T1 to T3 are connected to the electronic control board EP (accordingly, the driver part D for driving the motor M, the rotor position detecting part SEr, the hall element 16 of the opening sensor SEt, etc.) built in the electronic control unit ECU. Thus, they are connected outside the closing member S when viewed from the pump unit U.

  In addition, the outer wall portion Htw of the wiring covering portion Ht that covers at least a part of the wirings T1 to T3, in the illustrated example, the outside of the electronic control unit side wiring portions tc1 to tc3 is provided on the electronic control unit side during the molding. Holes h1 to h3 are formed as traces of holding pins (not shown) for pressing and holding the wiring portions tc1 to tc3 at predetermined positions in the cavity of the mold. If such a holding pin is used, when the housing H is molded so as to embed the first to third wirings T1 to T3 as described later, the plate-like electronic control unit side wiring parts tc1 to tc1 are used. Since tc3 (and hence the first to third wirings T1 to T3) can be accurately held at a predetermined position in the mold cavity, the wiring covering part Ht located outside the electronic control unit side wiring parts tc1 to tc3 is set as set. The connecting portions ju and jd of the wirings T1 to T3 can be more effectively protected from vibration.

  Next, the operation of this embodiment will be described. The pump unit U and the electronic control unit ECU, which are the main components of the fuel supply device A, are embedded and integrated in the housing H together with the wirings T1 to T3 connecting them, but before the housing H is molded. Individually manufactured in advance on a separate production line.

  For example, the electronic control unit ECU connects the IC chips 9 and 10 and the Hall element 16 of the opening sensor SEt to a predetermined part of the electronic control board EP which is a main component of the electronic control unit ECU, and uses it as an insert part for insulation. The cover body UC made of synthetic resin is manufactured by molding (that is, primary molding). In this case, a connection cylinder portion 8 that functions as a male coupler is integrally formed on one side of the cover body UC, and an electronic control board EP that functions as a connector terminal portion in the inner space of the connection cylinder portion 8. The edge part EPc is exposed, and the electronic control unit side wiring parts tc1 to tc3 of the first to third wirings T1 to T3 are projected upward from the upper surface of the cover body UC.

  The electronic control unit ECU manufactured in this way and the pump unit U assembled and manufactured separately from the electronic control unit ECU are connected by the first to third wirings T1 to T3, and the housing H is molded. Set in the cavity of the secondary molding die. In this case, the wiring portions ta1 to ta3 extending from the pump unit U side and the wiring portions tc1 to tc3 extending from the electronic control unit ECU side are respectively connected via the intermediate wiring portions tb1 to tb3. The intermediate wiring portion tb1 ˜tb3 upper and lower connection portions ju, jd, the wiring portions ta1 to ta3 from the pump unit U side and the wiring portions tc1 to tc3 from the electronic control unit ECU side are relatively slid in two different directions. Connect as possible. Therefore, the wiring unit on the pump unit U side is set at a stage where a combined body (insert part) in which the pump unit U and the electronic control unit ECU are coupled via the first to third wirings T1 to T3 is set in the mold cavity. Even if a slight misalignment occurs between the relative positions of ta1 to ta3 and the wiring portions tc1 to tc3 on the electronic control unit ECU side, the misalignment is impossible between the wiring portions ta1 to ta3 and tc1 to tc3. The intermediate wiring portions tb1 to tb3 can be connected without any trouble while absorbing.

  In this way, after the combined body of the pump unit U and the electronic control unit ECU is set in the cavity of the mold, molding of the housing H is performed using the mold as an insert part (that is, two parts). Next molding) is performed.

  The housing H after molding includes a pump unit covering portion Hc that covers the outer peripheral surface and both end walls of the unit case C of the pump unit U, and a fuel suction port Hio that continues to the tip outlet Cia of the suction pipe Ci of the pump unit U. A suction pipe covering portion Hi that surrounds and covers the entire circumference of the suction pipe Ci, a deaeration pipe 30 for discharging bubbles, and a fuel discharge port Hoa connected to the pipe outlet Coa at the tip of the discharge pipe Co. Then, the discharge pipe covering portion Ho surrounding and covering the periphery of the discharge pipe Co, the electronic control unit covering portion He covering the electronic control board EP, and the first to third wirings T1 to T3 are covered. Thus, a wiring covering portion Ht that shields from the outside is provided integrally.

  Thus, the fuel supply device A in which the pump unit U and the electronic control unit ECU are integrally embedded and covered in the housing H together with the wirings T1 to T3 between them is obtained.

  The fuel supply device A manufactured in this way is connected and fixed to one side wall of the throttle body B, particularly in this embodiment. That is, the stepped inner peripheral surface of the connected cylindrical portion 34 on the housing H (electronic control unit covering portion He) side is opposed to the stepped connecting cylindrical portion 6 on the throttle body B side. The seal member 36 is inserted between the stepped portions, and the first to third attached portions 21 to 23 on the housing H side are respectively in contact with the first to third attachment bosses 31 to 33 on the throttle body B side. They are in contact and fastened with bolts 7.

  The suction pipe covering portion Hi of the housing H is connected to a fuel conduit 41 as an external pipe extending from the fuel tank T. The discharge pipe covering portion Ho of the housing H is connected to the combustion chamber of the engine or to this. A fuel conduit 42 as an external pipe is connected to the fuel injection valve FV that can inject fuel into the continuous intake passage.

  Thus, in the engine operating state, in the electronic control unit ECU, the fuel injection valve control unit 9 of the electronic control board EP has various sensors for detecting the engine operating state, such as the throttle opening sensor SEt and the intake pressure sensor. In addition, the fuel injection amount of the fuel injection valve FV is calculated based on the output signal of the intake air temperature sensor, and the operation command signal is output to the fuel injection valve FV based on the calculation result to control the operation of the valve FV. .

  Further, the electronic control board EP detects the rotor rotational position from the driver portion D for driving and controlling the brushless motor M according to the operating state of the engine and the waveform of the induced voltage generated with the rotation of the rotor of the brushless motor M. Detection circuit part SEr. The brushless motor M is driven and controlled in accordance with the operation state of the engine based on the operation of the driver unit D and the detection circuit unit SEr, so that the fuel pump P passes through the discharge pipe Co to the fuel injection valve FV side. Fuel of optimum pressure is supplied according to the engine operating condition.

  According to the present embodiment described above, the pump unit U in which the fuel pump P and the motor M that drives the fuel pump P are combined and integrated, and the electronic control unit ECU that can drive and control the motor M and the fuel injection valve FV are included. The housing H is molded by using the small assembly (subassembly) as an insert part. And, such a casing H has a fuel discharge port Ho connected to the front end outlet Coa of the discharge pipe Co of the pump unit U at the front end, and a discharge pipe covering portion Ho (discharge cylinder portion) that covers the discharge pipe Co; The suction pipe covering portion Hi that covers the suction pipe Ci and the wiring covering portion Ht that covers the motor case wires T1 to T3 existing outside the unit case C and the discharge pipe Co of the pump unit U and shields them from the outside are integrated. In preparation.

  According to such a unique structure of the housing H, the pump unit U with the motor M, the electronic control unit ECU, and the motor operation wires T1 to T3 that connect the units U and ECU are connected to the housing H. Since it can be embedded together in the housing H at the same time as molding, the number of parts can be reduced, the assembly workability can be improved, and the cost can be reduced. In addition, since the discharge pipe covering portion Ho and the suction pipe covering portion Hi for connecting external pipes can be integrally formed with the housing H without changing the basic structure of the pump unit U including the discharge pipe Co and the suction pipe Ci, its discharge The tube covering portion Ho and the suction tube covering portion Hi can be easily designed with a high degree of freedom.

  In addition, in the present embodiment, the discharge pipe covering portion Ho (discharge cylinder portion) surrounds the outer periphery of the discharge pipe Co in a close contact state over the entire circumference and the entire surface, and the outlet of the discharge pipe Co across the surrounding portion. The wires T1 to T3 extend from the closed wall 20 of the unit case C on the side opposite to the Coa, and include a part of the discharge pipe covering portion Ho on the housing H side and the discharge pipe Co on the pump unit U side. A double tube structure is constructed. Thereby, from the front end outlet Coa of the discharge pipe Co, the boundary part between the discharge pipe Co and the discharge cylinder part Ho (by extension, the boundary part between the unit case C and the casing H, the wirings T1 to T3 and the casing H It is possible to effectively prevent the high-pressure fuel from leaking through the boundary portion), so that it is possible to avoid a decrease in pump performance due to the fuel leakage. Moreover, due to the double pipe structure, the discharge pipe Co and the discharge pipe covering portion Ho reinforce each other, and the rigidity strength of both is effectively increased.

  Further, the discharge pipe Co of the present embodiment has a large-diameter first pipe part 11 and a small-diameter second pipe part 12 connected to the tip part of the first pipe part 11 via a step 13. Since the discharge pipe covering portion Ho surrounds the outer circumferences of the first and second pipe portions 11 and 12 in a close contact state over the entire circumference and the entire surface, the discharge pipe covering and surrounding the outer circumference of the discharge pipe Co The entire circumference can be sealed at two locations (first and second pipe portions 11 and 12) with the step 13 between the portion Ho, and the sealing performance is improved. In addition, the presence of the step 13 between the first and second tube portions 11 and 12 can prevent the deformation of one tube portion 11 (12) due to an external force from spreading to the other tube portion 12 (11). Therefore, therefore, through the boundary between the discharge pipe covering portion Ho and the discharge pipe Co in the housing H (for example, the boundary portion between the end surface of the unit case C and the pump unit covering portion Hc, the wires T1 to T3 and the wire covering portion Ht). It is possible to more effectively prevent the high-pressure fuel from leaking out to the boundary with the

  Depending on how the housing H is molded, it is possible that high-pressure fuel leaks from the minute gaps at the boundary portions even in the double pipe structure described above. On the other hand, in the present embodiment, at least a part of the wirings T1 to T3, in the illustrated example, the upper portion tbu of the intermediate wiring portions tb1 to tb3 and the wiring covering of the housing H surrounding the outer periphery of the upper portion tbu. A blocking member S that can suppress fuel from being discharged through the wirings T1 to T3 is provided between the surfaces facing the portion Ht. The closing member S is provided in the lower part tbd instead of / in addition to the structure provided in the upper part tbu of the intermediate wiring parts tb1 to tb3 as in the present embodiment, or the pump unit side wiring part ta1. ˜ta3 or a structure provided in the electronic control unit side wiring portions tc1 to tc3 may be adopted.

  Thus, in the unlikely event that high-pressure fuel leaks from the discharge pipe Co of the pump unit U to the boundary portions and reaches the wirings T1 to T3, the fuel passes through the wirings T1 to T3. It is possible to reliably prevent the leakage through the blocking member S in the middle of the wirings T1 to T3. The high-pressure fuel whose leakage is blocked by the closing member S is the boundary between the pump unit covering portion Hc of the housing H and the unit case C, and between the suction pipe Ci and the suction pipe covering portion Hi of the fuel pump P. Since it can be returned to the suction pipe Ci through the boundary portions in sequence, it is possible to reliably prevent external leakage of high-pressure fuel without polluting the surrounding environment. In this case, the suction pipe covering portion Hi constitutes return means that can return the high-pressure fuel leaked from the discharge pipe Co side to the boundary between the housing H and the pump unit U to the suction portion of the fuel pump P, that is, the suction pipe Ci. To do.

  By the way, instead of attaching the fuel supply device A to the throttle body B as in this embodiment, another embodiment (not shown) in which the fuel supply device A is housed and installed in the fuel tank T, for example, is conceivable. In such another embodiment, at least a part of the unit case C of the pump unit U may be covered with the pump unit covering portion Hc of the housing H. In this case, the discharge pipe Co Even if the high-pressure fuel leaks through the boundary portion between the pump unit covering portion Hc and the unit case C, the high-pressure fuel can be returned directly into the fuel tank T from the end of the boundary portion. Therefore, it is possible to reliably prevent external leakage of high-pressure fuel without polluting the surrounding environment. In this case, the pump unit covering portion Hc is connected to the boundary between the housing H and the pump unit U from the discharge pipe Co side. The return means is configured to return the high-pressure fuel leaked to the fuel tank T.

  Further, according to the present embodiment, the first to third wirings T1 to T3 are made of a conductive metal material having rigidity and connect the pump unit U and the electronic control unit ECU, and these wirings T1 to T3. The pump unit covering portion Hc and the electronic control unit covering portion He of the housing H are integrally coupled through the wiring covering portion Ht of the housing H embedded integrally. Therefore, since the pump unit covering portion Hc and the electronic control unit covering portion He of the housing H can be firmly coupled with the wiring covering portion Ht of the housing H reinforced with the highly rigid wirings T1 to T3, The heavy pump unit U can be stably supported by the housing H.

  In addition, in the periphery of the portion of the wirings T1 to T3 extending from the pump unit U, that is, the periphery of the wiring covering portion Ht (particularly on both sides of the wiring covering portion Ht in the direction along the axis of the pump unit U). The body H is integrally formed with first and second attached portions 21 and 22 as attachment portions for attaching this to a throttle body B as a support. Therefore, since the high-rigidity wirings T1 to T3 and the wiring covering part Ht covering them can effectively reinforce the periphery of the mounting part (first and second attached parts 21 and 22) of the housing H. The pump unit U can be more firmly supported on the throttle body B via the housing H.

  In addition, the first to third wirings T1 to T3 of the present embodiment are connected to the motor M and have motor-side wiring portions whose outer ends project outside the unit case C (that is, pump unit-side wiring portions ta1 to ta3t). And the external wiring portion (that is, the intermediate wiring portions tb1 to tb3 and the electronic control unit) which are configured separately from the motor side wiring portion and are connected to the outer end portion of the motor side wiring portion via the connection portion ju. Side wiring portions tc1 to tc3), and the wirings T1 to T3 including the connecting portions ju and jd are embedded in the housing H together with the pump unit U and the electronic control unit ECU. As a result, the wires T1 to T3 and the intermediate connection portions ju and jd can be mechanically and firmly held by the housing H molded so that they are integrally embedded.

  Therefore, even if the fuel supply device A receives vibration, for example, engine vibration or running vibration, or vibration associated with the operation of the fuel pump P, the wirings T1 to T3, particularly the connecting portions ju and jd, do not vibrate unreasonably. Early wear and breakage of the connecting portions ju and jd due to vibrations are suppressed, and the durability is enhanced. Moreover, the wirings T1 to T3 including the connecting portions ju and jd are electronic control boards EP (accordingly, the fuel injection valve control unit 9, the driver M for driving the motor M, and the rotor position detection circuit unit SEr. ), The premature wear and breakage due to the vibrations of the connecting portions ju and jd are suppressed by the effect of burying the entire wirings T1 to T3 in the housing H as described above, so that the fuel injection valve FV operates. It is possible to effectively prevent the situation in which the control and the drive control of the brushless motor M are hindered due to wear damage of the connecting portions ju and jd.

  Furthermore, in this embodiment, the outer ends of the pump unit side wiring portions ta1 to ta3 of the first to third wires T1 to T3 extend in the same direction along the motor axis from the unit case C, and are orthogonal to the extending direction. When viewed from the projection plane (FIG. 4), the three connection portions ju connecting the outer end portions to the external wiring portions (that is, the intermediate wiring portions tb1 to tb3) are distributed so as to exist at the apexes of the triangle. The Then, since the three connection portions ju distributed and the wires T1 to T3 and the pump unit U connected thereto are embedded and integrated in the housing H, the wires T1 to T3, the pump unit U and the housing are integrated. Due to the mutual reinforcing effect, not only the overall strength of the wirings T1 to T3 including the connection portion ju is increased, but also the strength of the coupling support for the pump unit U by the housing H is enhanced. Thereby, the vibration of each connection part ju is suppressed more effectively, the further durability improvement is achieved, and the support rigidity of the pump unit U is further increased.

  Note that the first to third wirings T1 to T3 of the present embodiment are divided from the three wiring portions ta1 to ta3, tb1 to tb3, and tc1 to tc3 as described above. Therefore, from a different perspective, the pump unit side wiring portions ta1 to ta3t and the intermediate wiring portions tb1 to tb3 may be motor side wiring portions, and the electronic control unit side wiring portions tc1 to tc3 may be external side wiring portions. The lower connection portion jd corresponds to the connection portion between the motor side wiring portion and the external side wiring portion.

  Further, the first to third wirings T1 to T3 of the present embodiment are provided with an electronic control board EP (accordingly, a driver M for driving the motor M and a rotor) built in an electronic control unit ECU provided independently of the pump unit U. The position detection circuit unit SEr, the hall element 16 of the opening sensor SEt, and the like) are connected to the outside of the connection units ju and jd and the closing member S when viewed from the pump unit U. For this reason, even if the motor M and the electronic control board EP connected thereto via the wirings T1 to T3 are brought close to the pump unit U, the high-pressure fuel enters the electronic control board EP through the wirings T1 to T3. Therefore, the electronic control unit ECU can be disposed as close as possible to the pump unit U.

  In addition, in this embodiment, the electronic control board EP (therefore, the driver part D of the motor M, the rotor position detection circuit part SEr, the hall element 16 of the opening sensor SEt, etc.) is formed together with the pump unit U by molding of the housing H. Embedded in the housing H. Thereby, not only the number of parts of the fuel supply device A is reduced, but also the wiring of the pump unit U and the electronic control board EP (therefore, the driver part D, the rotor position detection circuit part SEr, the hall element 16 and the like) is wired. It can be consolidated and further cost savings are achieved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, in the above-described embodiment, the brushless motor M is used as a pump driving motor built in the unit case C of the fuel pump P. However, a brush motor may be used instead of the brushless motor. .

  In the above embodiment, the fuel supply device A is fixed to the throttle body B. However, in the present invention, the fuel supply device A may be fixed to a support other than the throttle body B. Alternatively, the fuel supply device A may be housed and installed in the fuel tank T.

  In the embodiment, the driver unit D, the rotor position detection unit SEr, and part of the opening sensor SEt (Hall element 16) are directly connected and fixed on the electronic control board EP in the electronic control unit ECU. In the present invention, these components D, SEr, 16 are provided outside the electronic control unit ECU, embedded or connected to the housing H, and electrically connected to the electronic control board EP. You may do it.

  In the above embodiment, the intake passage 1 is applied to the throttle body B extending in the horizontal direction or in a direction slightly inclined from the horizontal. However, the intake passage 1 may be applied to a throttle body extending in the vertical direction.

C ... Unit case Ci ... Suction pipe Co as suction part ... Discharge pipe Coa ... Outlet D of discharge pipe ... Driver part ECU ... As electronic control unit The electronic control unit EP of the electronic control board FV, the fuel injection valve H, the casing Hc, the pump unit cover Hi as the return means, the return means Suction tube covering portion Ho ... Discharge tube covering portion Hoa as a discharge cylinder portion ... Fuel discharge port Ht ... Wiring covering portion Htw ... Outer wall portions h1 to h3 ... Hole M ... -Brushless motor P as a motor-Fuel pump S-Closing member SEt-Opening sensor T as a sensor-Fuel tanks T1 to T3-First as a wiring ~ Third wiring ta1 to ta3 ·· Pump unit as plate wiring part Side wiring parts tb1 to tb3... Intermediate wiring parts tc1 to tc3 as plate wiring parts... Electronic control unit side wiring part U as plate wiring parts. 1 pipe portion 12 ... second pipe portion 13 ... step 16 ... Hall element 42 as part of sensor ... fuel conduit as external piping

Claims (4)

A fuel supply device comprising a pump unit (U) in which a fuel pump (P) capable of sucking and discharging fuel in a fuel tank (T) and a motor (M) capable of driving the fuel pump (P) are combined. In
A housing (H) in which at least a part of the pump unit (U) is embedded integrally is molded using the pump unit (U) as an insert part,
The pump unit (U) includes at least a unit case (C) containing the fuel pump (P) and a discharge projecting from the unit case (C) so that high-pressure fuel can be discharged from the fuel pump (P). A pipe (Co), and on the outside of the unit case (C) and the discharge pipe (Co) have wiring (T1 to T3) for operating the motor (M),
The casing (H) has a fuel discharge port (Hoa) connected to the tube outlet (Coa) of the discharge pipe (Co) at the tip, and an external pipe (42) covering the discharge pipe (Co). A discharge cylinder portion (Ho) that can be connected and a wiring covering portion (Ht) that covers the wires (T1 to T3) and shields them from the outside are integrally provided,
At least a part of the discharge cylinder portion (Ho) surrounds the outer periphery of the discharge pipe (Co) in a close contact state over the entire circumference, and a pipe outlet of the discharge pipe (Co) across the surrounding portion. The fuel supply device, wherein the wiring (T1 to T3) extends from the unit case (C) on the side opposite to (Coa). The discharge pipe (Co) is connected to a first pipe part (11) on the unit case (C) side and a front part of the first pipe part via a step (13). A second pipe portion (12) having a smaller diameter than 11),
The discharge cylinder part (Ho) surrounds the outer circumferences of the first and second pipe parts (11, 12) of the discharge pipe (Co) in close contact with each other over the entire circumference. Item 4. The fuel supply device according to Item 1. The wiring (T1 to T3) is at least part of a sensor (SEt) that detects a predetermined operating state of the engine and outputs a signal corresponding to the operating state as a signal for controlling the operation of the motor (M). Connected to the electronic control board (EP) equipped with (16),
At least a part (16) of the sensor (SEt) and the electronic control board (EP) are embedded in the casing (H) together with the pump unit (U) by molding the casing (H). The fuel supply device according to claim 1, wherein the fuel supply device is a fuel supply device. The fuel supply device according to any one of claims 1 to 3, for pumping high-pressure fuel to a fuel injection valve (FV) included in the engine,
The wires (T1 to T3) calculate the fuel injection amount of the fuel injection valve (FV) based on the operating state of the engine and control the operation of the fuel injection valve (FV) based on the calculation result. Connected to a control unit (ECU),
The electronic control unit (ECU) is embedded in the casing (H) together with the pump unit (U) by molding the casing (H).

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