JP5329321B2 - Fuel injection device - Google Patents

Abstract

The invention provides a fuel spray device being capable of implementing miniaturization of the device and improving vibration resistance of vibrations relative to an engine. A fuel spray device (10) integrally includes a throttle body (12) having a tubular wall part (20) for forming an intake channel (21), a fuel spray valve (14) for spraying the fuel in the intake channel (21), a fuel pump (16) for supplying the fuel spray valve (14) with the fuel, and a fuel pressure adjusting valve (18) for adjusting pressure of the fuel supplied for the fuel spray valve (14). The fuel pump (16) and the tubular wall part (20) of the throttle body (12) are configured in parallel. The fuel pump (16) and the fuel pressure adjusting valve (18) are individually configured along a direction crossed with an arrangement direction of the fuel spray valve (14) and the tubular wall part (20) of the throttle body (12).

Description

  The present invention relates to a fuel injection device mainly used for engines (internal combustion engines) of vehicles such as motorbikes, motorcycles such as motorcycles, automobiles, and all-terrain vehicles.

A conventional example of a fuel injection device will be described. FIG. 5 is an exploded perspective view showing the fuel injection device.
As shown in FIG. 5, the fuel injection device 200 includes a throttle body 230 having a tubular wall portion 231 forming an intake passage 231a, a fuel injection valve 252 for injecting fuel into the intake passage 231a, and a fuel injection valve 252. A fuel pump 253 for supplying fuel and a fuel pressure regulating valve 270 for adjusting the fuel pressure supplied to the fuel injection valve 252 are integrally provided. A fuel injection valve 252 is assembled to the upper portion of the tubular wall portion 231 of the throttle body 230. A fuel pump 253 is assembled on the throttle body 230. The longitudinal direction (axial direction) of the fuel pump 253 is oriented in a direction substantially orthogonal to the axial direction of the tubular wall portion 231 that is the longitudinal direction of the throttle body 230. Further, the fuel injection valve 252 is disposed between the tubular wall portion 231 and the fuel pump 253. Such a fuel injection device is described in Patent Document 1, for example.

JP 2005-105987 A

In the conventional fuel injection device 200, the longitudinal direction (axial direction) of the fuel pump 253 is oriented in a direction substantially orthogonal to the axial direction of the tubular wall portion 231 of the throttle body 230. For this reason, the end portion in the axial direction of the fuel pump 253 that is a heavy object protrudes greatly from the tubular wall portion 231. This not only hinders miniaturization of the fuel injection device 200, but also causes problems such as poor weight balance and low vibration resistance against engine vibration.
The problem to be solved by the present invention is to provide a fuel injection device capable of reducing the size of the device and improving the vibration resistance against engine vibration.

The above problems are solved by the following inventions.
A first invention is a throttle body having a tubular wall portion forming an intake passage, a fuel injection valve for injecting fuel into the intake passage, a fuel pump for supplying fuel to the fuel injection valve, and a supply to the fuel injection valve A fuel pressure adjustment valve that adjusts the fuel pressure to be adjusted is integrated, and the fuel pump is arranged in parallel on the tubular wall portion of the throttle body, thereby reducing the amount of fuel pump that protrudes from the tubular wall portion. In addition, the fuel injection device can be reduced in size. In addition, the fuel pump and the fuel pressure regulating valve are arranged separately in the direction intersecting the direction in which the tubular wall portion of the throttle body and the fuel injection valve are arranged, thereby improving the weight balance and providing vibration resistance against engine vibration. Can be improved.

In a second aspect based on the first aspect, the fuel pump and the fuel pressure regulating valve are arranged in parallel with the fuel injection valve interposed therebetween. Therefore, the fuel pump and the fuel pressure regulating valve can be integrated with the fuel injection valve in between. This is effective in reducing the size of the fuel injection device and improving the vibration resistance against engine vibration.

A third invention is the first or second invention, comprising a high-pressure fuel passage extending in a direction intersecting with an arrangement direction of the tubular wall portion of the throttle body and the fuel injection valve, and a fuel discharge port of the fuel pump; The fuel introduction port of the fuel injection valve and the fuel introduction port of the fuel pressure regulating valve are communicated with the high-pressure fuel passage so as to face the passage wall surface. Therefore, the risk of fuel leakage can be reduced by shortening the passage length of the high-pressure fuel passage and simplifying the passage configuration.

According to a fourth invention, in the third invention, a fuel chamber that houses a fuel pump and stores fuel, a surplus fuel chamber that houses a fuel pressure regulating valve and stores surplus fuel discharged from the fuel pressure regulating valve, A low pressure fuel passage for returning surplus fuel in the surplus fuel chamber to the fuel chamber, and the low pressure fuel passage is arranged in parallel with the high pressure fuel passage. Therefore, handling of the low pressure fuel passage can be facilitated.

According to a fifth aspect of the present invention, in the first or second aspect of the invention, the fuel pump includes a high-pressure fuel passage through which the fuel discharge port of the fuel pump, the fuel introduction port of the fuel injection valve, and the fuel introduction port of the fuel pressure regulating valve communicate. And a fuel chamber for storing fuel, a surplus fuel chamber for storing a fuel pressure regulating valve and storing surplus fuel discharged from the fuel pressure regulating valve, a low pressure fuel passage for returning surplus fuel in the surplus fuel chamber to the fuel chamber, And an electronic control unit that controls at least one of the fuel pump and the fuel injection valve, and the electronic control unit is disposed adjacent to at least one of the high-pressure fuel passage and the low-pressure fuel passage. Therefore, the electronic control unit can be cooled by the fuel flowing through at least one of the high pressure fuel passage and the low pressure fuel passage.

It is a front view which shows the fuel-injection apparatus which concerns on one Example. It is a sectional side view which shows a fuel-injection apparatus. It is a plane sectional view showing a fuel injection device. It is a front view which shows the fuel-injection apparatus which removed the cover. It is a disassembled perspective view which shows the fuel-injection apparatus which concerns on a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

An embodiment of the present invention will be described with reference to the drawings. The fuel injection device of the present embodiment is used for a motorcycle engine. FIG. 1 is a front view showing the fuel injection device, FIG. 2 is a side sectional view, FIG. 3 is a plan sectional view, and FIG. 4 is a front view showing the fuel injection device with the cover removed. For convenience of explanation, the fuel injection device will be described with the upstream side of the intake passage as the front side and the downstream side of the intake passage as the rear side. In addition, the vertical direction of the fuel injection device is the vertical direction when mounted on the motorcycle.
As shown in FIG. 4, the fuel injection device 10 is integrally provided with a throttle body 12, a fuel injection valve 14, a fuel pump 16, and a fuel pressure regulating valve 18. In addition, since the fuel injection valve 14, the fuel pump 16, and the fuel pressure regulation valve 18 are well-known things, detailed description about those structures is abbreviate | omitted.

  As shown in FIG. 2, the throttle body 12 is made of, for example, resin and has a hollow circular tubular wall portion 20 penetrating in the front-rear direction. A hollow portion of the tubular wall portion 20 serves as an intake passage 21. A center line (axis line) L1 of the intake passage 21 extends in the front-rear direction. An upstream member (for example, an air cleaner) of the intake passage 21 is connected to the front end portion (right end portion in FIG. 2) of the tubular wall portion 20. Further, a downstream side member (for example, an intake manifold) of the intake passage 21 is connected to a rear end portion (left end portion in FIG. 2) of the tubular wall portion 20. Therefore, the intake air flows through the intake passage 21 from the front side to the rear side.

  A throttle shaft 23 that traverses the intake passage 21 in the radial direction, that is, the left-right direction (the front and back direction in FIG. 2) is rotatably supported at the central portion in the axial direction of the tubular wall portion 20. A butterfly disk-like throttle valve 25 that opens and closes the intake passage 21 is attached to the throttle shaft 23. One end portion (right end portion) of the throttle shaft 23 protrudes from the tubular wall portion 20 to one side (right side), and a throttle lever 27 is provided at the shaft end portion (see FIG. 4). . A return spring 29 made of a coil spring is interposed between the opposing surfaces of the throttle lever 27 and the tubular wall portion 20. The return spring 29 always urges the throttle shaft 23 and the throttle valve 25 in the closing direction via the throttle lever 27. The throttle lever 27 is wound with an accelerator wire connected to an accelerator device (not shown) connected thereto. The amount of intake air flowing through the intake passage 21 is adjusted by rotating the throttle valve 25 via the accelerator wire based on the accelerator operation of the accelerator device.

  As shown in FIG. 4, an integrated sensor 31 is attached to the left side surface of the tubular wall portion 20. The integrated sensor 31 is a pressure sensor that detects the pressure of intake air flowing through the intake passage 21, an intake air temperature sensor that detects the temperature of intake air flowing through the intake passage 21, and a throttle position that detects the opening position of the throttle valve 25. Sensors and components (not shown) such as an idle speed control valve (hereinafter referred to as “ISC valve”) that controls the amount of intake air flowing through a bypass passage that bypasses the throttle valve 25 are integrally provided. In addition, on the front surface of the integrated sensor 31, an electrical connector 32 is provided in which the connectors related to each sensor and the ISC valve are integrated into one. An external connector (not shown) that is electrically connected to an external electronic control unit (ECU) (not shown) can be connected to the electrical connector 32 by being inserted from the front (in the surface direction in FIG. 4).

  As shown in FIG. 2, a hollow cylindrical injection valve mounting hole 34 is formed on the upper side of the tubular wall portion 20 of the throttle body 12 so as to be inclined forward and downward. The rear lower end of the injection valve mounting hole 34 is opened to the ceiling surface (upper wall surface) at the downstream end of the intake passage 21. Further, the center line (axis line) L2 of the injection valve mounting hole 34 is located on the vertical plane P1 including the axis line L1 of the intake passage 21 (see FIG. 4).

  As shown in FIG. 2, the fuel injection valve 14 is an electromagnetically driven fuel injection valve and is formed in a cylindrical shape. A nozzle portion 36 having a fuel injection hole 37 is formed concentrically at one end portion (tip portion) of the fuel injection valve 14. The nozzle portion 36 is concentrically connected by being inserted into the injection valve mounting hole 34. At the same time, the axis of the fuel injection valve 14 is aligned or substantially aligned with the axis L2. An annular groove (not shown) formed on the outer peripheral surface of the nozzle portion 36 is fitted with an O-ring 38 as a seal member that seals between the nozzle portion 36 and the peripheral wall surface of the injection valve mounting hole 34. Yes. A fuel introduction portion 40 having a fuel introduction port 41 is formed concentrically at the other end portion (base end portion) of the fuel injection valve 14. The high-pressure fuel passage 80 communicating with the fuel introduction port 41 will be described later.

  On the outer side of the fuel injection valve 14, an electrical connector 43 that is in parallel with the fuel introduction port 41 is provided in a protruding shape. The electrical connector 43 is arranged upward, and an external connector (not shown) that is electrically connected to an electronic control unit (ECU) (not shown) can be connected by insertion from the front upper side (upper right in FIG. 2). Yes. The fuel injection valve 14 injects the fuel introduced from the fuel introduction port 41 of the fuel introduction part 40 into the intake passage 21 from the fuel injection hole 37 of the nozzle part 36 by electromagnetic drive.

  As shown in FIG. 4, a pump housing cylinder part 45 is formed on the upper right side of the tubular wall part 20 of the throttle body 12. The pump accommodating cylinder portion 45 is formed in a bottomed rectangular cylinder shape that opens at the front surface and closes the rear surface. The axis L3 of the pump housing cylinder 45 is parallel to the axis L1 of the intake passage 21 (see FIG. 2). Inside the pump housing cylinder 45 is a fuel chamber 46 for storing fuel (see FIGS. 3 and 4). The fuel pump 16 is accommodated in the fuel chamber 46. The fuel pump 16 is formed in a cylindrical shape, and includes a motor-integrated electric fuel unit including an electric motor unit 48 and an impeller-type pump unit 49 concentrically provided at one end of the motor unit 48. It is a pump (see FIG. 3).

  As shown in FIG. 3, the fuel pump 16 is inserted concentrically and loosely into the fuel chamber 46 of the pump housing cylinder 45 with the motor 48 facing forward and the pump 49 facing backward. Supported by the state. At the same time, the axis of the fuel pump 16 is aligned or substantially aligned with the axis L3. A fuel suction part 51 having a fuel suction port 52 projects from the rear end surface of the pump part 49. A suction filter 54 is connected to the fuel suction portion 51. The suction filter 54 includes a filtering member 55 formed in a flat bag shape (see FIG. 4). The filtering member 55 is juxtaposed below the fuel pump 16 and filters the fuel sucked into the fuel pump 16. Further, a vapor discharge port 57 is provided at the rear end surface of the pump unit 49 to discharge vapor contained in fuel that is being pressurized by the pump unit 49 from the pump passage to the fuel chamber 46 (see FIG. 3).

  A fuel discharge portion 59 having a fuel discharge port 60 protrudes from the front end surface of the motor portion 48. In the fuel discharge port 60, a check valve 62 for maintaining a residual pressure for preventing the back flow of fuel is incorporated. The high-pressure fuel passage 80 communicating with the fuel discharge port 60 will be described later. An electric connector 64 is provided on the front end surface of the motor unit 48. The electrical connector 64 has a terminal 65 protruding forward. The terminal 65 of the electrical connector 64 can be connected to a terminal 103 (described later) on the cover 73 side by relative insertion from the front. Moreover, the fuel discharge part 59 and the electrical connector 64 are arranged side by side. In the fuel pump 16, the impeller (not shown) of the pump unit 49 is rotated by driving the motor unit 48, whereby the fuel in the fuel chamber 46 is transferred from the fuel suction port 52 into the pump unit 49 via the suction filter 54. After suction and pressure increase, the fuel is discharged from the fuel discharge port 60 via the check valve 62 via the motor unit 48.

  As shown in FIG. 4, a pressure regulating valve housing cylinder portion 67 is formed on the upper left side of the tubular wall portion 20 of the throttle body 12. The pressure regulating valve accommodating cylinder portion 67 is formed in a bottomed rectangular cylinder shape that opens at the front surface and closes the rear surface. An axis L4 of the pressure regulating valve housing cylinder portion 67 is parallel to the axis L1 (see FIG. 2) of the intake passage 21 and the axis L3 of the fuel pump 16 (see FIG. 3). The pressure regulating valve housing cylinder portion 67 is a surplus fuel chamber 68 that stores surplus fuel. In the surplus fuel chamber 68, the fuel pressure regulating valve 18 is accommodated in a state of being attached to a cover 73 (described later). A protrusion 69 for preventing the fuel pressure regulating valve 18 from coming off is formed on the rear wall surface of the surplus fuel chamber 68.

  As shown in FIG. 3, the throttle body 12 is formed with a cover mounting surface 71 including front end opening surfaces of the pump housing tube portion 45 and the pressure regulating valve housing tube portion 67. The cover mounting surface 71 is formed on a plane orthogonal to the axis L2 of the fuel injection valve 14 (see FIG. 2). A cover 73 is mounted on the cover mounting surface 71 by an appropriate number of bolts 74 (four are shown in FIG. 1). The means for attaching the cover 73 to the cover attachment surface 71 is not limited to the bolt 74 but may be a holding mechanism such as a snap fit. The cover 73 is made of, for example, resin. The cover 73 closes the front end opening surfaces of the fuel chamber 46 and the surplus fuel chamber 68 of the throttle body 12 (see FIG. 3). Further, the cover 73 is formed with an attachment surface 75 that comes into surface contact with the cover mounting surface 71. The cover mounting surface 71 of the throttle body 12 and the mounting surface 75 of the cover 73 can also be formed by planes that intersect other than the axis L2 of the fuel injection valve 14. As shown in FIG. 3, the attachment surface 75 of the cover 73 includes an annular groove (not shown) surrounding the front end opening surface of the fuel chamber 46 and a front end opening surface of the surplus fuel chamber 68. Gaskets 77 and 78 serving as seal members for sealing the space between the mounting surface 75 and the cover mounting surface 71 of the throttle body 12 are mounted on both the grooves where annular grooves (reference numerals omitted) are formed. ing.

  A hollow cylindrical high-pressure fuel passage 80 extending in the left-right direction is formed in the cover 73. The right end surface of the high-pressure fuel passage 80 is closed and the left end surface is opened. On the left end opening surface of the high-pressure fuel passage 80, an opening hole 81 having a large diameter is formed. The inside of the opening hole 81 is closed by a cap 83. The cap 83 is formed in a stepped cylindrical shape, and a small-diameter cylindrical portion (reference numeral omitted) is inserted into the left end portion of the high-pressure fuel passage 80. An O-ring 84 as a seal member that seals between the small-diameter cylindrical portion and the peripheral wall surface of the high-pressure fuel passage 80 is attached to an annular groove (reference numeral omitted) formed on the outer peripheral surface of the small-diameter cylindrical portion.

  As shown in FIG. 2, a hollow cylindrical low-pressure fuel passage 87 extending in the left-right direction (the front and back direction in FIG. 2) is formed in the cover 73. The low pressure fuel passage 87 is adjacent to the upper side of the high pressure fuel passage 80 and is arranged in parallel with the high pressure fuel passage 80. The right end face of the low pressure fuel passage 87 is closed, and the left end face is opened in the opening hole 81. The opening hole 81 corresponds to the opening of the low-pressure fuel passage 87 and is closed by the cap 83 (see FIG. 3). That is, the large-diameter cylindrical portion (reference numeral omitted) of the cap 83 is fitted in the opening hole portion 81 of the low-pressure fuel passage 87. An O-ring as a seal member that seals between the large-diameter cylindrical portion and the wall surface of the opening hole portion 81 of the low-pressure fuel passage 87 is formed in a stepped groove (reference numeral omitted) formed in the right end portion of the large-diameter cylindrical portion. 85 is installed. Further, the cap 83 is prevented from coming off by a wall portion 88 provided on the throttle body 12 and facing the left side of the cap 83 as the cover 73 is attached to the throttle body 12.

  As shown in FIG. 2, a cylindrical injection valve connection cylinder portion 89 having an injection valve connection port 90 communicating with the central portion of the high-pressure fuel passage 80 is formed at the central portion of the mounting surface 75 of the cover 73. ing. As the cover 73 is attached to the throttle body 12, the fuel introduction part 40 of the fuel injection valve 14 is inserted into the injection valve connecting cylinder part 89 relatively and concentrically. As a result, the fuel inlet 41 of the fuel injection valve 14 communicates with the high-pressure fuel passage 80 so as to face the passage wall surface. An O-ring 91 as a seal member that seals between the fuel introduction part 40 and the injection valve connecting cylinder part 89 is provided in a stepped groove (reference numeral omitted) formed in the outer peripheral surface of the fuel introduction part 40 of the fuel injection valve 14. Is installed.

  As shown in FIG. 1, a rectangular control device housing portion 93 is recessed at the center of the front surface of the cover 73 so as to be adjacent to the high pressure fuel passage 80 and the low pressure fuel passage 87 (see FIG. 1). 2). An electronic control device 95 is accommodated in the control device accommodating portion 93. The electronic control device 95 corresponds to at least one of a pump controller that controls driving (rotation speed) of the motor unit 48 of the fuel pump 16 and an electronic control device that controls the fuel injection amount of the fuel injection valve 14. A lid plate 97 that seals the electronic control device 95 by closing the opening is attached to the control device housing portion 93. The electronic control device 95 may be sealed with a potting material instead of the lid plate 97.

  As shown in FIG. 3, a hollow cylindrical pump connection port 99 communicating with the right end portion of the high pressure fuel passage 80 is formed at the right end portion of the mounting surface 75 of the cover 73. The pump connection port 99 is opened rearward (upward in FIG. 3). As the cover 73 is attached to the throttle body 12, the fuel discharge portion 59 of the fuel pump 16 is inserted into the pump connection port 99 relatively and concentrically. As a result, the fuel discharge port 60 of the fuel pump 16 communicates with the high-pressure fuel passage 80 so as to face the passage wall surface. Further, a stepped groove (reference numeral omitted) formed in the outer peripheral surface of the fuel discharge portion 59 of the fuel pump 16 is an O as a seal member that seals between the fuel discharge portion 59 and the peripheral wall surface of the pump connection port 99. A ring 100 is attached.

  An electrical connector 102 having a terminal 103 is juxtaposed on the right side of the pump connection port 99 at the right end of the mounting surface 75 of the cover 73. The electrical connector 102 is opened rearward (upward in FIG. 3). As the cover 73 is attached to the throttle body 12, the terminal 65 of the electric connector 64 of the fuel pump 16 is inserted into the terminal 103 of the electric connector 102 relatively and concentrically. Thereby, both terminals 65 and 103 are electrically connected. An electrical connector 105 is provided on the left side surface of the cover 73. An external connector electrically connected to an external electronic control unit (ECU) (not shown) can be connected to the electrical connector 105 by being inserted from the left side. Further, a conductive member (not shown) for electrically connecting the terminal 106 of the electrical connector 105 to the electronic control unit 95 and the terminal 103 of the electrical connector 102 is embedded in the cover 73.

  As shown in FIG. 1, a feed pipe 108 having a fuel inflow port 109 projects from the lower right portion of the front surface of the cover 73 (see FIG. 2). The fuel inlet 109 communicates with the lower end of the fuel chamber 46 of the throttle body 12. The feed pipe 108 is connected to a fuel supply piping member that communicates with the bottom of the fuel tank (not shown). For this reason, the fuel in the fuel tank flows from the fuel inlet 109 of the feed pipe 108 into the fuel chamber 46 by natural flow through the fuel supply piping member. Further, the fuel tank is disposed at an upper position (a higher position) than the fuel injection device 10.

  As shown in FIG. 3, a cylindrical communication port 110 is formed at the right end portion of the mounting surface 75 of the cover 73. The communication port 110 is opened rearward (upward in FIG. 3). The communication port 110 is formed concentrically with the fuel pump 16. The communication port 110 is formed so as to form a double ring on the inner peripheral side of the right gasket 77. As the cover 73 is attached to the throttle body 12, the communication port 110 communicates with the fuel chamber 46. Further, the communication port 110 communicates with the right end portion of the low-pressure fuel passage 87.

  As shown in FIG. 1, a return pipe 112 having a fuel outlet 113 protrudes from the upper right portion of the front surface of the cover 73 (see FIG. 2). The fuel outlet 113 communicates with the right end of the low-pressure fuel passage 87 (see FIG. 3). The return pipe 112 is connected to a return piping member that communicates with a gas phase portion in a fuel tank (not shown). For this reason, the vapor generated in the fuel path communicating with the fuel chamber 46, the surplus fuel chamber 68, the low pressure fuel passage 87, etc., floats on the ceiling surface of the passage due to its buoyancy and flows along the ceiling surface to further flow the fuel. The gas is discharged from the outlet 113 through the return piping member into the gas phase portion in the fuel tank.

  As shown in FIG. 3, a cylindrical pressure regulating valve mounting cylinder portion 115 having a pressure regulating valve connection port 116 communicating with the left end portion of the high pressure fuel passage 80 is formed at the left end portion of the mounting surface 75 of the cover 73. ing. The pressure regulating valve connection port 116 is opened toward the rear. The pressure regulating valve connection port 116 is formed in a stepped hole shape in which the front part is a small diameter hole part and the rear part is a large diameter hole part. A cylindrical return port 118 is formed on the outer periphery of the pressure regulating valve mounting cylinder 115. The return port 118 is opened rearward (upward in FIG. 3). The return port 118 is formed concentrically with the pressure regulating valve connection port 116. The return port 118 is formed so as to form a double ring on the inner peripheral side of the left gasket 78. The left end of the low-pressure fuel passage 87 communicates with the upper portion of the return port 118. Further, the rear portion of the pressure regulating valve mounting cylinder portion 115 protrudes rearward from the mounting surface 75. Further, the fuel pressure regulating valve 18 is inserted concentrically into the large diameter hole portion of the pressure regulating valve connection port 116.

  The fuel pressure regulating valve 18 is a relief valve type fuel pressure regulating valve formed in a columnar shape, having a fuel introduction port 120 on one end face (front end face) and exhausting excess fuel on the other end face (rear end face). It has an outlet 121. The fuel pressure regulating valve 18 adjusts the fuel pressure supplied from the fuel introduction port 120 to a specified pressure, and discharges excess surplus fuel from the surplus fuel discharge port 121. The fuel pressure regulating valve 18 is inserted into the large-diameter hole portion of the pressure regulating valve connection port 116 so that the fuel introduction port 120 communicates with the high pressure fuel passage 80 so as to face the passage wall surface. Further, a stepped groove (reference numeral omitted) formed in the outer peripheral surface of the rear end portion of the fuel pressure regulating valve 18 serves as a seal member that seals between the fuel pressure regulating valve 18 and the peripheral wall surface of the pressure regulating valve connection port 116. An O-ring 122 is attached. As the cover 73 is attached to the throttle body 12, the rear portion of the pressure regulating valve mounting cylinder 115 is inserted into the surplus fuel chamber 68 in the pressure regulating valve accommodating cylinder 67 in a loose fit. As a result, the fuel pressure regulating valve 18 is accommodated in the surplus fuel chamber 68 and the fuel pressure regulating valve 18 is prevented from coming off by the protrusion 69. Further, the surplus fuel discharge port 121 of the fuel pressure regulating valve 18 communicates with the surplus fuel chamber 68. Further, the return port 118 communicates with the surplus fuel chamber 68. At the same time, the axis of the fuel pressure regulating valve 18 is aligned or substantially aligned with the axis L4.

  The operation of the fuel injection device 10 will be described. The fuel in the fuel tank flows from the fuel inlet 109 of the feed pipe 108 into the fuel chamber 46 by natural flow through a fuel supply piping member. When the motor unit 48 of the fuel pump 16 is driven, the impeller of the pump unit 49 is rotated, so that the fuel in the fuel chamber 46 is sucked into the pump unit 49 from the fuel suction port 52 via the suction filter 54. After the pressure is raised, the fuel is discharged from the fuel discharge port 60 via the check valve 62 via the motor unit 48. The discharged high-pressure fuel passes through the high-pressure fuel passage 80 from the pump connection port 99, the fuel introduction port 41 of the fuel injection valve 14 from the injection valve connection port 90, and the fuel pressure adjustment valve 18 from the pressure adjustment valve connection port 116. The fuel is supplied to the fuel inlet 120.

  The high-pressure fuel introduced into the fuel injection valve 14 is injected into the intake passage 21 from the fuel injection hole 37 by driving the fuel injection valve 14. The fuel pressure supplied to the fuel injection valve 14 is adjusted to a specified pressure by the fuel pressure regulating valve 18. That is, when the fuel pressure exceeds a specified pressure, the fuel pressure regulating valve 18 is opened by the operation of a relief valve built in the fuel pressure regulating valve 18, whereby surplus fuel is discharged from the surplus fuel discharge port 121 to the surplus fuel chamber 68. Is discharged. The surplus fuel is returned from the return port 118 to the fuel chamber 46 through the low pressure fuel passage 87 and the communication port 110. Further, when the fuel pressure is equal to or lower than the specified pressure, the fuel pressure regulating valve 18 is closed, so that the inside of the high pressure fuel passage 80 is maintained at a predetermined fuel pressure. Further, the vapor generated in the fuel path communicating with the fuel chamber 46, the surplus fuel chamber 68, the low pressure fuel passage 87, etc., floats on the ceiling surface of the passage due to its buoyancy and flows along the ceiling surface, and further flows into the fuel outlet. From 113, it is discharged into the gas phase portion in the fuel tank via a return piping member. When the operation of the fuel injection device 10 is stopped, the fuel pressure so-called residual pressure is held in the high-pressure fuel passage 80 by closing the check valve 62 and the fuel pressure regulating valve 18. Thereby, generation | occurrence | production of the vapor | steam in the high pressure fuel channel | path 80 is suppressed, and restartability is improved.

  According to the fuel injection device 10 described above, the fuel pump 16 is arranged in parallel on the tubular wall portion 20 of the throttle body 12 (see FIG. 4). Thereby, the amount of protrusion of the fuel pump 16 that is a heavy object with respect to the tubular wall portion 20 (particularly, the amount of protrusion to the right side with respect to the vertical plane P1 including the axis L1 of the intake passage 21 and the axis L2 of the fuel injection valve 14) is reduced. The fuel injection device 10 can be reduced in size. As a result, the mountability of the fuel injection device 10 in a narrow space of the motorcycle can be improved. In addition, the fuel pump 16 and the fuel pressure regulating valve 18 are arranged so as to be distributed in the direction (left-right direction) intersecting the arrangement direction (vertical direction) of the tubular wall portion 20 of the throttle body 12 and the fuel injection valve 14. Thus, the weight balance can be improved and the vibration resistance against engine vibration can be improved.

  The fuel pump 16 and the fuel pressure regulating valve 18 are arranged in parallel with the fuel injection valve 14 therebetween (see FIG. 4). Therefore, the fuel pump 16 and the fuel pressure regulating valve 18 can be integrated with the fuel injection valve 14 therebetween. This is effective for reducing the size of the fuel injection device 10 and improving vibration resistance against engine vibration.

  In addition, a high-pressure fuel passage 80 extending in the direction (left-right direction) intersecting the alignment direction (vertical direction) of the tubular wall portion 20 of the throttle body 12 and the fuel injection valve 14 is provided, and the fuel discharge port 60 of the fuel pump 16 is provided. The fuel introduction port 41 of the fuel injection valve 14 and the fuel introduction port 120 of the fuel pressure regulating valve 18 communicate with the high-pressure fuel passage 80 so as to face the passage wall surface (see FIG. 3). Therefore, the risk of fuel leakage can be reduced by reducing the length of the high-pressure fuel passage 80 and simplifying the passage configuration. In addition, the shortening of the passage length of the high-pressure fuel passage 80 can shorten the pressure increase time from the start of the operation of the fuel pump 16 to a predetermined fuel pressure. For this reason, the check valve 62 for holding the residual pressure of the fuel pump 16 can be omitted, and the cost can be reduced. In addition, it is possible to reduce (reduce) the processing accuracy required for the contact between the valve body and the valve seat for maintaining oil tightness when the fuel injection valve 14 and the fuel pressure regulating valve 18 are closed, thereby reducing the cost. Can be achieved. Further, since the high pressure fuel passage 80 is formed in the cover 73, the cost can be reduced by configuring the high pressure fuel passage 80 without using a high pressure hose.

  A fuel chamber 46 that houses the fuel pump 16 and stores fuel, an excess fuel chamber 68 that houses the fuel pressure regulating valve 18 and stores excess fuel discharged from the fuel pressure regulating valve 18, and an excess fuel chamber 68. A low pressure fuel passage 87 for returning surplus fuel to the fuel chamber 46 is provided, and the low pressure fuel passage 87 is arranged in parallel with the high pressure fuel passage 80 (see FIGS. 2 and 3). Therefore, handling of the low-pressure fuel passage 87 can be facilitated.

  Further, the fuel discharge port 60 of the fuel pump 16, the fuel introduction port 41 of the fuel injection valve 14, and the fuel introduction port 120 of the fuel pressure regulating valve 18 are communicated with each other, and the fuel pump 16 is accommodated and the fuel is stored. A fuel chamber 46 that stores the surplus fuel discharged from the fuel pressure regulating valve 18, and a low pressure fuel passage 87 that returns surplus fuel in the surplus fuel chamber 68 to the fuel chamber 46. And an electronic control unit 95 that controls at least one of the fuel pump 16 and the fuel injection valve 14, and the electronic control unit 95 is disposed adjacent to the high-pressure fuel passage 80 and the low-pressure fuel passage 87. (See FIGS. 1 and 2). Therefore, the electronic control unit 95 can be cooled by the high pressure fuel flowing through the high pressure fuel passage 80 and the low pressure fuel flowing through the low pressure fuel passage 87.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the present invention can be applied as a fuel injection device for vehicles such as automobiles and all-terrain vehicles in addition to motorcycles. In the above embodiment, the fuel pump 16 is disposed on the right side and the fuel pressure regulating valve 18 is disposed on the left side. However, the fuel pump 16 may be disposed on the left side and the fuel pressure regulating valve 18 may be disposed on the right side. Further, the fuel pump 16 and the fuel pressure regulating valve 18 are arranged so as to be distributed in a direction (left-right direction) intersecting with the arrangement direction (vertical direction) of the tubular wall portion 20 of the throttle body 12 and the fuel injection valve 14. For example, the fuel pump 16 may be arranged not only on the upper right side of the tubular wall portion 20 of the throttle body 12 but also on the right side or the lower right side, and the fuel pressure regulating valve 18 may be disposed on the tubular shape of the throttle body 12. The wall portion 20 is not limited to the upper left side, and may be disposed on the left side or the lower left side. Further, the axis L3 of the fuel pump 16 and / or the axis L4 of the fuel pressure regulating valve 18 may not be parallel to the axis of the tubular wall portion 20 of the throttle body 12. Moreover, in the said Example, although the tubular wall part 20 and the fuel injection valve 14 of the throttle body 12 were juxtaposed in the perpendicular direction, the juxtaposition direction can be changed suitably. Further, the high pressure fuel passage 80 and the low pressure fuel passage 87 can be changed based on the arrangement relationship of the fuel pump 16 and the fuel pressure regulating valve 18. In the embodiment, the electronic control device 95 is disposed adjacent to the high pressure fuel passage 80 and the low pressure fuel passage 87. However, the electronic control device 95 is adjacent to either the high pressure fuel passage 80 or the low pressure fuel passage 87. You may arrange so that.

DESCRIPTION OF SYMBOLS 10 ... Fuel injection apparatus 12 ... Throttle body 14 ... Fuel injection valve 16 ... Fuel pump 18 ... Fuel pressure regulating valve 20 ... Tubular wall part 21 ... Intake passage 41 ... Fuel introduction port 46 ... Fuel chamber 60 ... Fuel discharge port 68 ... Excess fuel Chamber 87 ... Low pressure fuel passage 95 ... Electronic control unit 80 ... High pressure fuel passage 120 ... Fuel inlet

Claims (5)

A throttle body having a tubular wall that forms an intake passage;
A fuel injection valve for injecting fuel into the intake passage;
A fuel pump for supplying fuel to the fuel injection valve;
A fuel pressure regulating valve that adjusts the fuel pressure supplied to the fuel injection valve, and
The fuel injection valve, the fuel pump and the fuel pressure regulating valve are arranged on the outer peripheral portion of the tubular wall portion of the throttle body,
The fuel pumps are arranged in parallel on the tubular wall of the throttle body,
Injecting the fuel pump and the fuel pressure regulating valve not on the opposite side of the fuel injection valve in the direction of alignment of the tubular wall portion of the throttle body and the fuel injection valve disposed on the outer peripheral portion of the tubular wall portion On the valve side, the fuel injection device is arranged so as to be distributed in a direction intersecting with an arrangement direction of the tubular wall portion and the fuel injection valve . The fuel injection device according to claim 1,
The fuel injection device, wherein the fuel pump and the fuel pressure regulating valve are arranged in parallel with the fuel injection valve interposed therebetween. The fuel injection device according to claim 1 or 2,
A high-pressure fuel passage extending in a direction intersecting the direction in which the tubular wall portion of the throttle body and the fuel injection valve are arranged;
A fuel discharge port of the fuel pump, a fuel introduction port of the fuel injection valve, and a fuel introduction port of the fuel pressure regulating valve are communicated with the high pressure fuel passage so as to face the passage wall surface. Injection device. The fuel injection device according to claim 3,
A fuel chamber that houses the fuel pump and stores fuel;
A surplus fuel chamber that houses the fuel pressure regulating valve and stores surplus fuel discharged from the fuel pressure regulating valve;
A low-pressure fuel passage for returning surplus fuel in the surplus fuel chamber to the fuel chamber,
The fuel injection device, wherein the low-pressure fuel passage is arranged in parallel with the high-pressure fuel passage. The fuel injection device according to claim 1 or 2,
A high pressure fuel passage through which a fuel discharge port of the fuel pump, a fuel introduction port of the fuel injection valve, and a fuel introduction port of the fuel pressure regulating valve are communicated;
A fuel chamber that houses the fuel pump and stores fuel;
A surplus fuel chamber that houses the fuel pressure regulating valve and stores surplus fuel discharged from the fuel pressure regulating valve;
A low-pressure fuel passage for returning surplus fuel in the surplus fuel chamber to the fuel chamber;
An electronic control unit that controls at least one of the fuel pump and the fuel injection valve;
The fuel injection device, wherein the electronic control unit is disposed adjacent to at least one of the high pressure fuel passage and the low pressure fuel passage.

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