JPWO2006115014A1 - Fuel supply device - Google Patents

Abstract

An electric motor 10 and a fuel pump 20 driven by the electric motor 10 are accommodated in a casing 4 attached to the fuel tank 2. A brush holder portion 39 that holds the brush 38 of the electric motor 10 and a pressure regulator 50 that controls the pressure of fuel discharged from the fuel pump 20 are provided on the end cover 12 attached to the end portion of the casing 4. The brush 38 is disposed at a position facing the rotation shaft 33 of the electric motor 10, and the pressure regulator 50 is disposed in a gap portion 44 formed between the brushes 38.

Description

  The present invention relates to a fuel supply device for a vehicle, and more particularly to a fuel supply device for a motorcycle that supplies fuel from a fuel tank to a fuel injection device.

  In recent years, fuel pump modules that integrate fuel pumps, pressure control devices, strainers, etc. are widely used as fuel supply devices for vehicles such as motorcycles and four-wheeled vehicles from the viewpoint of reducing the number of parts and improving the efficiency of assembly work. It is used. In such a fuel pump module, an electric pump driven by an electric motor is used as a fuel pump, and the pump driving motor is united together and arranged in the fuel tank or in the vicinity of the fuel tank.

For example, in a fuel supply apparatus such as Patent Document 4, an electric pump, a strainer, a pressure regulator, and the like are fixed to a disk-shaped member called a flange to form a pump module. Then, by attaching this flange to the opening of the fuel tank, the fuel supply device is mounted in the tank. Moreover, in the fuel supply apparatus like patent document 1, a motor, a pump, a damper, etc. are integrated in a substantially cylindrical shape, and a pump module is formed. This module is inserted and installed in the tank from the service hole of the fuel tank.
JP 56-66446 A JP-A-60-138297 Japanese Utility Model Publication No. 61-123654 Japanese Patent Laid-Open No. 11-44272 JP-A-11-257174 Japanese Patent Laid-Open No. 11-257175 JP-A-11-257176

  However, in the fuel supply device as in Patent Document 4, since the electric pump and the pressure regulator are arranged in parallel, the outer diameter of the fuel pump module becomes large, and the device itself becomes large. there were. On the other hand, in the case of the fuel supply device as in Patent Document 1, since the electric pump and the pressure regulator (or damper) are arranged in series, the module outer diameter can be reduced more than that of Patent Document 4, It is inevitable that the size in the longitudinal direction becomes large and the device itself becomes large. In particular, in fuel supply devices for motorcycles, there are various fuel tank sizes and shapes, and there is a demand for a small and long-life fuel supply device that can be installed in any fuel tank. The device has not been able to meet that demand.

  An object of the present invention is to provide a small and long-life fuel supply device.

  The fuel supply device of the present invention is a fuel supply device comprising a casing attached to a fuel tank and an electric motor provided with a power feeding brush and a pump unit driven by the electric motor, The end cover attached to the end portion of the electric motor is provided with a brush holder portion for holding the brush and a pressure control device for controlling the pressure of fuel discharged from the pump portion.

  In the fuel supply device of the present invention, since the brush holder portion and the pressure control device are both arranged on the end cover, the space efficiency of the device is improved, and the fuel supply device can be downsized. In this case, since the pressure control device can be built in with the same diameter as the pump portion, there is no overhanging portion on the outer periphery of the device, and the workability of mounting in the fuel tank is improved. Further, since there are no pipes or brackets for connecting the pressure control device or the like, the earthquake resistance of the device is also improved.

  According to another aspect of the present invention, there is provided a fuel supply apparatus comprising: a casing attached to a fuel tank; and an electric motor having a power feeding brush and a pump unit driven by the electric motor. An end cover attached to an end of the electric motor, a brush holder provided with a holder part that is formed separately from the end cover and disposed in the electric motor, and holds the brush; It has a pressure control device which is installed in the brush holder and controls the pressure of the fuel discharged from the pump part.

  In the fuel supply device of the present invention, since the pressure control device is arranged in the brush holder, the space efficiency of the device is improved, and the fuel supply device can be downsized. Also in this case, the pressure control device can be built in with the same diameter as the pump unit. Further, since there are no pipes or brackets for connecting the pressure control device or the like, the earthquake resistance of the device is also improved.

  In the fuel supply device, the pressure control device may be disposed between the brushes. Further, in the fuel supply device, the brush may be disposed at a position facing the rotation shaft of the electric motor, and the pressure control device may be disposed in a gap formed between the brushes of the cover. . Furthermore, in the fuel supply device, the brush and the pressure control device may be arranged in parallel along the axial direction of the rotating shaft of the electric motor.

  According to the fuel supply device of the present invention, the end cover attached to the end of the electric motor controls the pressure of the fuel discharged from the pump holder and the brush holder that holds the brush that supplies power to the electric motor. Since the pressure control device is provided, the space efficiency of the device is improved, and the fuel supply device can be downsized. In addition, it is possible to incorporate a pressure control device having the same diameter as the pump portion, and it is possible to eliminate the projecting portion of the outer peripheral portion of the device, and to improve the workability of mounting in the fuel tank. Furthermore, pipes and brackets for connecting a pressure control device and the like can be eliminated, and the earthquake resistance of the device can be improved, and durability and reliability can be improved.

  According to another fuel supply device of the present invention, since the pressure control device is arranged in the brush holder, the space efficiency of the device is improved and the fuel supply device can be downsized. . In addition, the pressure control device can be built in with the same diameter as the pump portion, the overhanging portion of the outer peripheral portion of the device can be eliminated, and the mounting workability in the fuel tank is improved. Furthermore, pipes and brackets for connecting a pressure control device and the like can be eliminated, and the earthquake resistance of the device can be improved, and durability and reliability can be improved. Furthermore, since there are no pipes or brackets for connecting the pressure control device or the like, the earthquake resistance of the device is also improved.

  On the other hand, in the fuel supply device of the present invention, by arranging the pressure control device between the brushes, the pressure control device is arranged in a portion between the brushes, which has conventionally been a dead space. The fuel supply device can be downsized.

  In addition, by placing the brushes at positions facing each other across the rotating shaft of the electric motor, and placing the pressure control device in a gap formed between the brushes, pressure is applied to the portion between the brushes, which has conventionally been a dead space. Since the control device is arranged, the space can be effectively used, and the fuel supply device can be downsized.

  Furthermore, by arranging the brush and the pressure control device in parallel along the axial direction of the rotating shaft of the electric motor, it is possible to prevent an increase in device size due to the pressure control device, and to reduce the size of the device.

It is sectional drawing which shows the structure of the fuel supply apparatus which is Example 1 of this invention. It is explanatory drawing which shows the installation position of the pressure regulator in the fuel supply apparatus of FIG. 1, and has shown the cross section along the AA line of FIG. It is sectional drawing which shows the structure of the fuel supply apparatus which is Example 2 of this invention. It is sectional drawing which shows the structure of the fuel supply apparatus which is Example 3 of this invention. It is a top view of the fuel supply apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Fuel tank 2a Bottom surface 2b Pump attachment hole 2c Top surface 3 Fuel piping 4 Casing 4a Case part 4b Flange part 5 Cover 6 Outlet pipe 7 Power supply connector 8 Power supply terminal 9 Harness 10 Electric motor 11 Shell case 12 End cover 13 End Cover 14 Fuel discharge part 15 Fuel suction part 16 Check valve 17 Ball 18 Return spring 19 Spring holder 20 Fuel pump 21 Filter 22 End cover mounting part 23 Fuel flow path 24 O-ring 25 Fuel chamber 26 Clearance 27 Permanent magnet 28 Armature 29 Slot 31 Core 32 Winding 33 Rotating shaft 33a D cut part 34 Bearing part 35 Pump case 36 Bearing 37 Commutator 38 Brush 39 Brush holder part 41 Spring 42 Pigtail 43 Terminal plate 44 Air gap part 50 Pressure regulator 51 Regulator mounting part 52 Diaphragm 53 Armature 54 Valve body 55 Spring holder 56 Step part 57 Cover 58 Spring 59 Ball 61 Tapered part 62 Oil path 63 Valve spring 64 Valve seat part 65 Fuel inflow port 66 Fuel outflow port 67 Opening 71 Impeller 72 Impeller receiving portion 73 Pump chamber 74 Fuel discharge port 75 Fuel intake port 76 Communication hole 101 Fuel supply device
102 Filter 103 Filter bracket
104 Oil chamber 111 Fuel supply system
112 Commuter 113 Sliding contact surface
114 brush 115 spring
116 Brush holder 116a Holder part
117 Spring holder 118 Spring holder
121 Pressure regulator 122 Case
123 Cover 124 Diaphragm
125 Armature 126 Fuel inlet
127 Fuel outlet 128 Valve body
129 Spring holder 131 Spring
132 Ball 133 Taper
134 Oil passage 135 Valve seat

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a configuration of a fuel supply apparatus that is Embodiment 1 of the present invention. A fuel supply device 1 in FIG. 1 is a device for a motorcycle, and is attached to the bottom of a fuel tank 2 so as to be inserted from below the tank. The fuel supply device 1 is connected to a fuel supply system of an engine (not shown), and supplies fuel to a fuel injection valve of the engine via a fuel pipe 3.

  The fuel supply device 1 has a configuration in which an electric motor 10, a fuel pump (pump unit) 20 and a pressure regulator 50 are integrated and accommodated in a synthetic resin casing 4. The casing 4 includes a cylindrical case portion 4a and a flange portion 4b. The electric motor 10, the fuel pump 20, and the pressure regulator 50 are accommodated in the case portion 4a. A cover 5 made of synthetic resin is attached to the upper end side of the case portion 4a, and is inserted into the tank through a pump attachment hole 2b formed in the bottom surface 2a of the fuel tank 2 in this state. At that time, the flange portion 4b is fixed to the bottom portion of the fuel tank 2 by bolts and nuts (not shown).

  An outlet pipe 6 and a power connector 7 are formed at the lower end of the casing 4. The fuel pipe 3 is connected to the outlet pipe 6. The power connector 7 is connected to power wiring (not shown). A power terminal 8 is accommodated in the power connector 7, and a harness 9 is connected to the power terminal 8. The harness 9 extends upward on the side of the casing 4 and is electrically connected to the electric motor 10 at the upper end of the casing.

  The electric motor 10, the fuel pump 20, and the pressure regulator 50 are integrally accommodated in a steel shell case 11. End covers 12 and 13 are crimped to both ends of the cylindrical shell case 11. The end cover 12 is formed of a synthetic resin and is attached to one end side of the shell case 11. The end cover 12 is provided with a brush holder portion 39 that holds the brush 38 of the electric motor 10, and serves as a cover for the shell case 11 and a brush holder. Further, the end cover 12 is provided with a regulator mounting portion 51 in which the pressure regulator 50 is accommodated.

  The end cover 13 is formed by aluminum die casting and is attached to the other end side of the shell case 11. On the lower end side of the end cover 13, a fuel discharge part 14 and a fuel suction part 15 are projected. A check valve (check valve) 16 is provided in the fuel discharge portion 14. The check valve 16 includes a ball 17, a return spring 18, and a spring holder 19, and prevents fuel from flowing backward from the fuel pipe 3 side to the fuel pump 20 side. A filter 21 is attached to the outside of the fuel suction portion 15.

  The fuel discharge portion 14 is fitted and connected to an end cover attachment portion 22 formed on the bottom portion of the case portion 4 a of the casing 4. The end cover mounting portion 22 is provided in such a form that the diameter of the end portion of the fuel flow path 23 formed in the outlet pipe 6 is increased. The fuel discharge portion 14 is attached to the end cover attachment portion 22 through an O-ring 24 in an airtight state. When the fuel discharge portion 14 is attached to the end cover attachment portion 22, a fuel chamber 25 is formed between the end cover 13 and the bottom surface of the case portion 4a, and the filter 21 is disposed there. The fuel flows into the fuel chamber 25 through a gap 26 between the shell case 11 and the inner surface of the case portion 4a.

  The electric motor 10 is a DC motor with a brush. The shell case 11 also serves as a yoke for the electric motor 10, and a plurality of permanent magnets 27 are fixed to the inner peripheral surface thereof. An armature 28 is rotatably disposed inside the permanent magnet 27. The armature 28 includes a core 31 having a plurality of slots 29 extending in the axial direction, and a winding 32 wound around the slot 29. The armature 28 is fixed to the rotary shaft 33 and is rotatably supported between a bearing portion 34 provided on the end cover 12 and a bearing 36 attached to the pump case 35.

  A commutator 37 is provided on the upper side of the armature 28 in FIG. The commutator 37 is fixed to the rotating shaft 33. A brush 38 is in contact with the commutator 37 from the radial direction. The brush 38 is accommodated in a brush holder portion 39 formed on the end cover 12 and is pressed against the commutator 37 by a spring 41. A pigtail 42 is attached to the brush 38 and is connected to a terminal plate 43. The terminal plate 43 is connected to the harness 9, whereby the power supply terminal 8 and the brush 38 are electrically connected.

  A pressure regulator 50 is attached to the regulator attachment portion 51 of the end cover 12. FIG. 2 is an explanatory view showing the installation position of the pressure regulator 50, and shows a cross section along the line AA of FIG. 1 of the electric motor 10. As shown in FIG. 2, in the fuel supply device 1 according to the present invention, the pressure regulator 50 is disposed between the brushes 38. That is, in the fuel supply apparatus 1, the pressure regulator 50 is disposed in the gap 44 between the brushes 38 that has conventionally been a dead space. Therefore, as apparent from FIG. 1, the pressure regulator 50 and the brush 38 can be arranged in parallel along the axial direction.

  Therefore, unlike the apparatus disclosed in Patent Document 1, the longitudinal dimension of the apparatus does not become longer due to the installation of the pressure regulator. Further, since the pressure regulator 50 is accommodated in the end cover 12, the radial dimension can be suppressed. That is, while the outer diameter is the same as that of the device of Patent Document 1 or the like, the same longitudinal dimension as that of the device of Patent Document 4 can be realized, and the device can be downsized. Furthermore, since the pressure regulator can be built in with the same diameter as the fuel pump diameter, there is no overhanging portion on the outer periphery of the device, and the workability of mounting in the fuel tank 2 is improved. Further, since the pump mounting hole 2b can be made small, the seal length of the fuel tank 2 can be shortened, and the sealing performance can be improved.

  In addition, in the fuel supply device 1, since there are no pipes, brackets, or the like for connecting the pressure regulator 50 or the like, the vibration resistance of the device is improved, and high durability and reliability can be realized. In particular, even in a motorcycle that requires high durability, the fuel supply apparatus 1 can ensure sufficient durability and reliability under severe use conditions. As described above, in the fuel supply device 1 of the present invention, it is possible to provide a fuel supply device that has a smaller size and improved durability of the device, and is smaller and has a longer life than conventional devices. It becomes possible.

  The pressure regulator 50 disposed at such a position has a valve structure similar to that used in Patent Document 4, and includes an armature 53 supported by a diaphragm 52. The armature 53 includes a valve body 54 and a spring holder 55, and an inner peripheral portion of the diaphragm 52 is sandwiched between the valve body 54 and the spring holder 55. The outer peripheral portion of the diaphragm 52 is sandwiched between a step portion 56 formed in the regulator mounting portion 51 and a cover 57 accommodated in the regulator mounting portion 51, so that the armature 53 can be moved up and down by the diaphragm 52. Supported. A spring 58 that urges the armature 53 downward in the figure is disposed between the spring holder 55 and the inner periphery of the upper end of the cover 57. The cover 57 is press-fitted into the regulator mounting portion 51, and then the upper portion is caulked and fixed, so that movement in the axial direction is restricted.

  A ball 59 is disposed in the valve body 54. The ball 59 is provided on a tapered portion 61 formed on the valve body 54 so as to be contactable and detachable. An oil passage 62 is formed in the valve body 54, and the oil passage 62 is shut off and opened when the ball 59 comes into contact with and leaves the tapered portion 61. The ball 59 is urged downward in the figure by a valve spring 63 disposed in the oil passage 62. A valve seat 64 projects from the bottom surface of the regulator mounting portion 51 so as to face the armature 53. The armature 53 is pressed against the upper surface of the valve seat 64 by the pressing force of the spring 58. At this time, the ball 59 also comes into contact with the valve seat portion 64, and the ball 59 is pushed up against the pressing force of the valve spring 63 and comes into contact with the taper portion 61. As a result, the oil passage 62 is blocked and the valve is closed.

  A fuel inflow port 65 is provided at the bottom of the regulator mounting portion 51. A fuel outlet 66 is provided in the cover 57 attached above the end cover 12, and the fuel outlet 66 communicates with the opening 67 of the cover 5. In such a pressure regulator 50, when the fuel pressure in the shell case 11 exceeds a predetermined adjustment pressure, the armature 53 receives the fuel pressure and moves upward. Then, the ball 59 is detached from the tapered portion 61 by the pressing force of the valve spring 63, the oil passage 62 is opened, and the valve is opened. As a result, the fuel inlet 65 and the fuel outlet 66 communicate with each other via the oil passage 62, and excess fuel is returned into the fuel tank 2.

  The fuel pump 20 is a non-volume regenerative pump and is formed of a pump case 35 and an impeller 71. At the lower end side of the pump case 35, a cylindrical impeller accommodating portion 72 is sunk. An impeller 71 connected to the rotating shaft 33 of the electric motor 10 is disposed in the impeller accommodating portion 72. The rotary shaft 33 is formed with a D-cut portion 33 a, and the impeller 71 is attached to the D-cut portion 33 a and rotates integrally with the rotary shaft 33. Near the outer periphery of the impeller 71, a number of axially extending pump chambers 73 are provided along the circumferential direction.

  Corresponding to the pump chamber 73, a fuel discharge port 74 and a fuel suction port 75 are provided in the fuel discharge portion 14 and the fuel suction portion 15 of the end cover 13, respectively. As described above, the check valve 16 is disposed downstream of the fuel discharge port 74, and the filter 21 is disposed upstream of the fuel intake port 75. On the other hand, on the upper end side of the impeller accommodating portion 72, a communication hole 76 that opens toward the inside of the shell case 11 is provided corresponding to the pump chamber 73. With this communication hole 76, the fuel pressure of the fuel sent to the fuel discharge port 74 by the rotation of the impeller 71 becomes equal to the pressure in the shell case 11, and the fuel pressure can be adjusted by the pressure regulator 50.

  The fuel supply apparatus 1 having such a configuration functions as follows. First, when the electric motor 10 is driven and the fuel pump 20 is activated, the fuel in the fuel tank 2 flows into the fuel chamber 25 through the gap 26 and is sucked from the fuel inlet 75 through the filter 21. At this time, in the fuel pump 20, the impeller 71 rotates together with the rotating shaft 33, and fuel is sucked into the pump chamber 73 from the fuel suction port 75 as the impeller 71 rotates. The fuel sent into the pump chamber 73 is sent to the fuel discharge port 74 by the rotation of the impeller 71 and discharged from the fuel discharge portion 14 to the fuel flow path 23 in the outlet pipe 6.

  Here, the shell case 11 is filled with fuel, and the fuel pressure in the fuel flow path 23 is the same as that in the shell case 11 as described above. When the fuel pressure exceeds a predetermined adjustment pressure, the pressure regulator 50 is opened, and the fuel in the shell case 11 is returned to the fuel tank 2. Thereby, the pressure of the fuel supplied to the fuel pipe 3 side is appropriately adjusted. The fuel whose fuel pressure is adjusted is sent from the fuel flow path 23 to the fuel pipe 3. The fuel pipe 3 is connected to the fuel injection valve of the engine as described above, and the fuel sucked from the fuel tank 2 by the fuel supply device 1 is supplied to the fuel injection valve via the fuel pipe 3.

  FIG. 3 is a cross-sectional view showing a configuration of a fuel supply apparatus that is Embodiment 2 of the present invention. The fuel supply device 101 of FIG. 3 is also for a motorcycle, but unlike the fuel supply device 1 described above, it is attached to the upper surface 2c of the fuel tank 2 so as to be inserted from above the tank. In the following embodiments, the same members and portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The basic configuration of the fuel supply device 101 is the same as that of the fuel supply device 1 of FIGS. 1 and 2, but the following points are different from the fuel supply device 1 due to the difference in the mounting specifications. That is, in the fuel supply device 101, (1) the check valve 16 is also installed in the end cover 12 together with the pressure regulator 50. The end cover 12 is provided with a brush holder portion (not shown) as in the fuel supply device 1 of FIG. Although the brush 38 is not shown in FIG. 3, in FIG. 3, the brush holder portion and the brush are disposed on the front side and the back side of the rotation shaft 33. In FIG. 2, the end of the spring 41 is arranged at the position of the brush in the fuel supply device 101. However, in the fuel supply device 101, the spring 41 is moved in the vertical direction in FIG. A check valve 16 is disposed in the gap.

  (2) A fuel discharge portion 14 is formed to protrude from the end cover 12. The fuel discharge part 14 is attached to an end cover attachment part 22 formed at the upper end part of the case part 4 a of the casing 4 in an airtight state via an O-ring 24. The point that the check valve 16 is arranged in the fuel discharge portion 14 is the same, but the inflow side of the check valve 16 opens directly into the shell case 11.

  (3) The fuel pump 20 is not formed with the fuel discharge portion 14 protruding, and the communication hole 76 also serves as the fuel discharge port 74 in the fuel supply device 1. That is, the fuel sucked from the fuel suction port 75 as the impeller 71 rotates is discharged from the pump chamber 73 into the shell case 11 through the communication hole 76.

  (4) The shape and mounting state of the filter 102 are different from those of the fuel supply device 1. In the fuel supply device 101, a filter bracket 103 is attached to a fuel suction portion 15 projecting from the end cover 13, and a filter 102 is fixed to the end portion thereof. The filter 102 itself is different from the filter 21.

  (5) When the fuel pressure exceeds a predetermined level, excess fuel is discharged from the pressure regulator 50 to the oil chamber 104. Excess fuel in the oil chamber 104 is returned to the fuel tank 2 from the lower end of the casing 4 through the gap 26.

  Also in such a fuel supply apparatus 101, the pressure regulator 50 and the check valve 16 are disposed between the two brushes 38, and the longitudinal dimension of the apparatus is reduced while suppressing the radial dimension. . Therefore, as with the fuel supply device 1 described above, the device is downsized and the durability of the device is improved, and a fuel supply device that is smaller and has a longer life than the conventional device can be realized.

  4 is a cross-sectional view showing a configuration of a fuel supply apparatus according to Embodiment 3 of the present invention, and FIG. 5 is a plan view of the fuel supply apparatus of FIG. 4 shows a configuration in which the casing 4 is omitted, and only the electric motor 10 and the fuel pump 20 are shown. 4 differs from the above-described fuel supply devices 1 and 101 in that a so-called flat type (flat type) commutator 112 is used as a commutator. The commutator 112 is fixed to the rotary shaft 33, and a sliding contact surface 113 is provided on the end surface in the axial direction. A brush 114 is in contact with the sliding contact surface 113 from the axial direction, and the brush 114 is pressed against the commutator 112 by a spring 115.

  The brush 114 is accommodated in a holder portion 116a formed on a brush holder 116 made of synthetic resin. In the first and second embodiments, the brush holder portion 39 is provided integrally with the end cover 12. However, in the fuel supply device 111, the brush holder 116 is formed separately from the end cover 12. The spring 115 is disposed in a spring accommodating portion 117 formed in the end cover 12. A spring holder 118 is attached to the spring accommodating portion 117, and one end side of the spring 115 is held by the spring holder 118.

  As can be seen from FIG. 5, the brush 114 is disposed to face the rotation shaft 33. Also in the fuel supply apparatus 111, the pressure regulator 121 is disposed between the brushes 114, and the pressure regulator 121 and the brush 114 are disposed in parallel along the axial direction. Further, as shown in FIG. 5, the pressure regulator 121, the pair of brushes 114, and the fuel discharge unit 14 are equally arranged at 90 ° intervals on the end cover 12. Thus, the present invention is applicable regardless of the structure of the commutator. Note that a check valve 16 (not shown in FIGS. 4 and 5) is disposed in the fuel discharge section 14 in the same manner as the fuel supply devices 1 and 101 described above.

  Here, the pressure regulator 121 has a configuration in which an armature 125 supported by a diaphragm 124 is disposed in a housing in which a case 122 and a cover 123 are caulked and joined. A fuel inlet 126 is provided on the case 122 side, and a fuel outlet 127 is provided on the cover 123 side. The armature 125 includes a valve body 128 and a spring holder 129, and an inner peripheral portion of the diaphragm 124 is sandwiched between the valve body 128 and the spring holder 129. The outer periphery of the diaphragm 124 is sandwiched between the case 122 and the cover 123, and the armature 125 is supported by the diaphragm 124 so as to be vertically movable in the housing. A spring 131 that urges the armature 125 downward in the figure is disposed between the spring holder 129 and the inner periphery of the upper end of the cover 123.

  A ball 132 is disposed at the left end of the valve body 128 in the figure. The ball 132 is provided on a tapered portion 133 formed on the valve body 128 so as to be contactable and detachable. An oil passage 134 is formed in the valve body 128, and the oil passage 134 is shut off and opened when the ball 132 comes into contact with and is released from the tapered portion 133. The ball 132 is urged toward the left in the figure by a valve spring (not shown) disposed in the oil passage 134. A valve seat portion 135 projects from the bottom surface of the case 122 so as to face the armature 125. The armature 125 is pressed against the upper surface of the valve seat portion 135 by the pressing force of the spring 131. At this time, the ball 132 also contacts the valve seat portion 135, and the ball 132 is pushed up against the pressing force of the valve spring and contacts the taper portion 133. As a result, the oil passage 134 is blocked and the valve is closed.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, in the above-described embodiment, an example in which the fuel supply device according to the present invention is used for a motorcycle has been shown. However, the application is not limited to this, and the fuel supply device for various vehicles such as a four-wheeled vehicle. It can also be used. The configuration of the present invention can be applied not only to a fuel pump but also to a pump such as a liquid such as water or chemicals or a gas such as air. The configuration of the pressure regulator 50 is merely an example, and is not limited to the above-described configuration. For example, various pressure regulators such as those having the same configuration as the check valve 16 can be used.

  Further, in the above-described embodiment, the fuel supply device is described in which the brushes are arranged to face each other at an interval of 180 ° with the rotation shaft 33 interposed therebetween. The present invention can be applied to various arrangement forms such as those arranged at a position of 0 °. In addition, in the above-described embodiment, an example in which a two-pole motor is used as the electric motor 10 is shown. However, the number of poles of the motor is not limited to this, and for example, a fuel supply device using a four-pole motor In addition, the present invention is applicable.

Claims (5)

In a casing attached to a fuel tank, a fuel supply device comprising an electric motor provided with a power supply brush and a pump unit driven by the electric motor,
A fuel supply characterized in that a brush holder portion for holding the brush and a pressure control device for controlling the pressure of fuel discharged from the pump portion are provided on an end cover attached to an end portion of the electric motor. apparatus. In a casing attached to a fuel tank, a fuel supply device comprising an electric motor provided with a power supply brush and a pump unit driven by the electric motor,
An end cover attached to an end of the electric motor;
A brush holder that is formed separately from the end cover and is disposed in the electric motor, and includes a holder portion that holds the brush;
A fuel supply device comprising: a pressure control device that is installed in the brush holder and controls a pressure of fuel discharged from the pump unit.   3. The fuel supply apparatus according to claim 1, wherein the pressure control device is disposed between the brushes.   3. The fuel supply device according to claim 1, wherein the brush is disposed at a position facing the rotation shaft of the electric motor, and the pressure control device is a gap formed between the brushes of the cover. The fuel supply device is arranged in a section.   3. The fuel supply device according to claim 1, wherein the brush and the pressure control device are arranged in parallel along an axial direction of a rotation shaft of the electric motor. 4.

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