JP2017180337A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device capable of sufficiently absorbing pulsation even in a case where a fuel pump and an injector are arranged closely.SOLUTION: A fuel supply device 14 includes: a body 17 configured to section a suction passage 13; a fuel pump 18 connected to the body 17, and configured to suction fuel in a fuel tank 16 and discharge it from a discharge port 18b; an injector 19 connected to the body 17, facing to the suction passage 13 at its tip, and configured to inject fuel, introduced from a fuel introduction port 57, from the tip toward the suction passage 13; and a rubber hose 58 connecting the fuel introduction port 57 of the injector 19 to the discharge port 18b of the fuel pump 18, and bent at one or more places.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel supply apparatus.

  In the fuel supply device disclosed in Patent Document 1, an injector, a fuel pump, and a regulator are integrated with a throttle body. A throttle body is superimposed on the upper surface of the square fuel pump. The central axis of the injector is arranged in a virtual plane orthogonal to the central axis of the intake passage. Piping connecting the fuel pump to the injector is not disclosed.

Special table 2011-522161

  Generally, the fuel pump is disposed in a fuel tank. A pressure hose is used to connect the fuel pump and the injector. The expansion and contraction of the pressure hose is minute. The pulsation during the operation of the injector is absorbed by the pulsation damper. As the fuel pump approaches the injector and the length of the hose is reduced, the effect of pulsation increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuel supply device that can sufficiently absorb pulsation even when a fuel pump and an injector are arranged close to each other.

  According to the first aspect of the present invention, a main body that defines an intake passage, a fuel pump that is coupled to the main body, sucks fuel in a fuel tank, and discharges the fuel from a discharge port; The injector that faces the intake passage and injects fuel introduced from the fuel introduction port from the tip toward the intake passage, and the fuel introduction port of the injector is connected to the discharge port of the fuel pump. A fuel supply device is provided comprising a rubber hose that curves at a location.

  According to the second aspect, in addition to the configuration of the first side surface, the fuel pump is disposed in one space partitioned by a virtual plane including the central axis of the intake passage, and the injector is disposed in the other space. .

  According to the third aspect, in addition to the configuration of the first or second side surface, the fuel pump includes an electric motor having a drive shaft extending in parallel with the central axis of the intake passage.

  According to the fourth aspect, in addition to the configuration of the third side face, the fuel pump has the discharge port at one end close to the injector, parallel to the drive shaft.

  According to the fifth aspect, in addition to the configuration of the fourth aspect, the fuel supply device is a butterfly having a valve body that is rotatably supported by the main body by a valve shaft that crosses the intake passage and is disposed in the intake passage. The fuel pump and the injector are arranged in one space that includes a throttle valve of a type and is partitioned by a virtual plane including a central axis of the intake passage and a rotation axis of the valve shaft.

  According to the sixth aspect, in addition to the configuration of the fifth side, the main body defines an upstream side of the intake passage, defines a first body that supports the throttle valve, and a downstream side of the intake passage. A second body coupled to the first body and supporting the injector.

  According to the first aspect, both the fuel pump and the injector are coupled to the main body and are disposed close to each other. Therefore, the length of the rubber hose is shortened compared to the case where the fuel pump is disposed in the fuel tank. Since the rubber hose has a predetermined elasticity, the pulsation during operation of the injector is absorbed by the expansion and contraction of the rubber hose. In particular, since the rubber hose has a curved portion, even if the fuel pump and the injector are arranged close to each other, the hose of the hose is compared with the case where the fuel introduction port of the injector is connected to the discharge port of the fuel pump with a linear hose. The amount of expansion and contraction can be ensured. In this way, the pulsation can be sufficiently absorbed.

  According to the second aspect, as long as the fuel pump is located in one space and the injector is located in the other space, the occupied space of the fuel pump and the occupied space of the injector do not overlap. The fuel pump and the injector can be arranged next to each other across a virtual plane. Thus, the space occupied by the fuel pump and the injector can be reduced in the direction of the central axis of the intake passage. Miniaturization of the fuel supply device is realized.

  According to the third aspect, generally, the electric motor includes a rotor that is coaxially fixed to the drive shaft, and a stator that surrounds the rotor. A rotor and a stator are comprised by the cylindrical shape coaxial with a drive shaft. Therefore, when the fuel pump is arranged in parallel in the intake passage, the fuel supply device can be downsized.

  According to the fourth aspect, the length of the rubber hose is thus reduced as much as possible. Miniaturization of the entire fuel supply device is realized.

  According to the fifth aspect, the fuel pump and the injector can be placed in close proximity without interfering with the intake passage and the throttle valve and their associated components.

  According to the sixth aspect, the first body and the second body are molded separately, and the first body and the second body are bonded to each other after molding. Compared to the case where the entire body is molded as a single body, the molding process is simplified.

1 is a side view of a fuel supply apparatus schematically showing an overall configuration of a fuel injection system according to an embodiment of the present invention. It is a top view of a fuel supply apparatus. It is a partial cross section front view of a fuel supply apparatus. FIG. 4 is a vertical sectional view of the injector taken along line 4-4 of FIG.

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

  FIG. 1 schematically shows the configuration of a fuel injection system 11 according to an embodiment of the present invention. The fuel injection system 11 includes a fuel supply device 14 having an intake passage 13 connected to the intake passage of the internal combustion engine 12, and a fuel tank 16 connected to the fuel supply device 14 by a fuel pipe 15 and a return pipe 15a. The fuel supply device 14 generates an air-fuel mixture based on the air flowing through the intake passage 13 and the fuel supplied from the fuel tank 16, and sends the fuel toward the combustion chamber of the internal combustion engine 12 in the form of the air-fuel mixture. The fuel injection system 11 is used by being mounted on a saddle type vehicle such as a motorcycle.

  The fuel supply device 14 includes a main body 17 that defines the intake passage 13, a fuel pump 18 that is coupled to the main body 17, and an injector 19 that is coupled to the main body 17 and faces the intake passage 13 at the tip. The intake passage 13 is formed by a cylindrical space having a central axis Xis. The main body 17 is divided into a first body 22 on the air cleaner side and a second body 23 on the internal combustion engine 12 side by a dividing surface 21 orthogonal to the central axis Xis. The first body 22 defines the upstream side of the intake passage 13. The second body 23 defines the downstream side of the intake passage 13 and is coupled to the first body 22 in an airtight manner around the intake passage 13.

  For example, an electronic control unit (ECU) 24 is coupled to the fuel pump 18. The electronic control unit 24 includes a control board 26 wrapped in an insulating resin molded body 25. An IC chip and other electronic components are mounted on the control board 26. The electronic control unit 24 controls the operation of the fuel injection system 11.

  The insulating resin molded body 25 of the electronic control unit 24 is coupled to the housing 28 of the fuel pump 18 by integral molding. The insulating resin molded body 25 and the housing 28 are coupled to the first body 22 of the main body 17 by bolts 29. A female connector 31 is formed at one end of the insulating resin molded body 25. In the female connector 31, conductive connection terminals arranged along the edge of the control board 26 are exposed.

  The injector 19 is mounted on the second body 23 of the main body 17. The attitude of the injector 19 is defined by the axis Cj of the built-in electromagnetic solenoid. An axis Cj of the injector 19 is positioned in a virtual plane including the central axis Xis of the intake passage 13 while being orthogonal to a rotation axis 32 of a throttle valve described later. The posture of the injector 19 is inclined at a specific angle α with respect to the central axis Xis of the intake passage 13.

  A female coupler 34 is formed integrally with the housing 33 of the injector 19. The female coupler 34 receives a pair of male couplers from above. A control signal is supplied to the electronic solenoid from a conductive terminal in the female coupler 34. Here, the female coupler 34 is disposed immediately above the injection port (facing the intake passage 13) of the injector 19 in accordance with the inclination of the posture.

  The fuel pump 18 includes a pump body 35 accommodated in a housing 28. The pump main body 35 includes a casing 36 formed of a metal cylinder, a first end surface member 37 a that is fitted into one end of the casing 36 and defines the first end surface 35 a of the pump main body 35, and the other end of the casing 36. A second end face member 37b that is fitted and defines the second end face 35b of the pump body 35. The first end face member 37a defines an impeller chamber 39 between the bearing member 38 and the first end face member 37a. An impeller 41 is accommodated in the impeller chamber 39. A drive shaft 42 is coupled to the impeller 41. The drive shaft 42 is supported by the bearing member 38 and the second end surface member 37b so as to be rotatable about the axis.

  The first end face member 37 a is formed with a suction pipe 43 that communicates with the suction port 18 a of the fuel pump 18. The in-pipe passage 44 of the suction pipe 43 is connected to the impeller chamber 39. The suction pipe 43 is partitioned into a nipple 45 of the housing 28. The fuel pipe 15 is coupled to the nipple 45. When the impeller 41 rotates, fuel is sucked into the impeller chamber 39 from the fuel pipe 15 through the suction pipe 43.

  A deaeration hole 46 is formed in the first end surface member 37a. The deaeration hole 46 is connected to the in-pipe passage 48 of the discharge pipe 47. The vapor generated in the pump body 35 flows into the return pipe 15a from the deaeration hole 46. In this way, the vapor is returned to the fuel tank 16.

  The pump body 35 includes an electric motor 49 connected to the drive shaft 42 of the impeller 41. The electric motor 49 includes a rotor 51a that is coupled to the drive shaft 42, and a stator 51b that faces the rotor 51a outside the rotation path of the rotor 51a. The rotor 51a is constituted by a permanent magnet, for example. The stator 51b is composed of, for example, an electromagnetic coil group. The drive shaft 42 is rotated based on the electric power supplied to the stator 51b. Thus, the impeller 41 rotates. Electric power is supplied to the stator 51b from a conducting wire 52 that protrudes to the outside from the second end face member 37b. The drive shaft 42 extends in parallel to the central axis Xis of the intake passage 13. Here, the drive shaft 42 has an axis Cp parallel to the central axis Xis of the intake passage 13.

  A discharge pipe 53 communicating with the discharge port 18b of the fuel pump 18 is formed on the second end surface member 37b. A check valve 55 is disposed in the pipe passage 54 of the discharge pipe 53. The check valve 55 prevents the back flow while allowing the fuel to be discharged from the discharge port 18b. The discharge port 18 b is partitioned into a nipple 56 of the housing 28. When the impeller 41 rotates, the fuel is discharged from the discharge port 18b with a specified pressure. The discharge port 18b of the fuel pump 18 is disposed coaxially with the drive shaft 42 at one end of the fuel pump 18 close to the injector 19.

  The injector 19 has a fuel inlet 57. A discharge port 18 b of the fuel pump 18 is connected to the fuel introduction port 57 via a rubber hose 58. Fuel is introduced into the injector 19 from the fuel introduction port 57 at a specified pressure.

  As shown in FIG. 2, the rubber hose 58 is curved at at least one location. Here, the rubber hose 58 includes a first linear portion 59a that extends linearly from the discharge port 18b of the fuel pump 18 in parallel to the central axis Xis of the intake passage 13, and a center of the intake passage 13 that is continuous with the first linear portion 59a. A first bending portion 59b that bends at an angle of 90 degrees along a virtual plane parallel to a reference plane including the axis Xis and the rotation axis 32 of the throttle valve, and continues along the virtual plane following the first bending portion 59b. A second linear portion 59c that extends linearly, and a second curved portion that is continuous from the second linear portion 59c and is curved at an angle of 180 degrees along the virtual plane and connected to the fuel inlet 57 of the injector 19 59d. Thus, the rubber hose 58 ensures a specific pipe length while bypassing the female coupler 34 of the injector 19.

  As shown in FIG. 3, a throttle valve 62 is incorporated in the first body 22 of the main body 17. The throttle valve 62 is configured as a butterfly type. The throttle valve 62 is disposed in the intake passage 13. The valve shaft 63 of the throttle valve 62 is supported by the first body 22 so as to be rotatable about the rotation axis 32 across the intake passage 13. A throttle drum 64 as an operated member is coupled to one end of the valve shaft 63. A Bowden cable (not shown) is connected to the throttle drum 64. The pulling force of the Bowden cable drives the valve shaft 63 in the opening direction. The valve shaft 63 is provided with a return spring 65 that exhibits an elastic force for holding the throttle valve 62 in the closed position.

  As shown in FIG. 3, the fuel pump 18 is disposed in one space 67 partitioned by a virtual plane 66 including the central axis Xis of the intake passage 13, and the injector 19 is disposed in the other space 68. Thus, a positional shift between the occupied space of the fuel pump 18 and the occupied space of the injector 19 is ensured in the circumferential direction around the central axis Xis of the intake passage 13. The fuel pump 18 and the injector 19 are arranged adjacent to each other across the virtual plane 66. In addition, the fuel pump 18 and the injector 19 are disposed in one space 71 partitioned by a virtual plane 69 including the central axis Xis of the intake passage 13 and the rotation axis 32 of the valve shaft 63.

  As shown in FIG. 4, the injector 19 has an injection port 72 that faces the intake passage 13. The injection port 72 is configured by, for example, an injection nozzle. Fuel is sprayed from the injection port 72 toward the space of the intake passage 13.

  In the fuel supply device 14 according to the present embodiment, the fuel pump 18 and the injector 19 are both coupled to the main body 17 and are disposed close to each other. Therefore, the length of the rubber hose 58 is shortened as compared with the case where the fuel pump 18 is disposed in the fuel tank 16. Since the rubber hose 58 has a predetermined elasticity, the pulsation during operation of the injector 19 is absorbed by the expansion and contraction of the rubber hose 58. In particular, since the rubber hose 58 has the first curved portion 59b and the second curved portion 59d, even if the fuel pump 18 and the injector 19 are disposed close to each other, the fuel introduction of the injector 19 to the discharge port 18b of the fuel pump 18 is introduced. The amount of expansion and contraction of the hose can be ensured as compared with the case where the port 57 is connected by a linear hose. In this way, the pulsation can be sufficiently absorbed.

  In the fuel supply device 14, the fuel pump 18 is disposed in one space 67 partitioned by a virtual plane 66 including the central axis Xis of the intake passage 13, and the injector 19 is disposed in the other space 68. As long as the fuel pump 18 is located in one space 67 and the injector 19 is located in the other space 68, the occupied space of the fuel pump 18 and the occupied space of the injector 19 do not overlap. The fuel pump 18 and the injector 19 are arranged adjacent to each other across the virtual plane 66. Thus, the space occupied by the fuel pump 18 and the injector 19 is reduced in the direction of the central axis Xis of the intake passage 13. Miniaturization of the fuel supply device 14 is realized.

  The fuel pump 18 includes an electric motor 49 having a drive shaft 42 extending in parallel with the central axis Xis of the intake passage 13. The electric motor 49 includes a rotor 51a that is coaxially fixed to the drive shaft 42, and a stator 51b that surrounds the rotor 51a. The rotor 51 a and the stator 51 b are formed in a cylindrical shape coaxial with the drive shaft 42. Therefore, when the fuel pump 18 is arranged in parallel with the intake passage 13, the fuel supply device 14 can be downsized.

  The fuel pump 18 is coaxial with the drive shaft 42 and has a discharge port 18 b at one end close to the injector 19. Thus, the length of the rubber hose 58 is reduced as much as possible. Miniaturization of the entire fuel supply device 14 is realized.

  In the fuel supply device 14, the fuel pump 18 and the injector 19 are disposed in one space 71 partitioned by a virtual plane 69 including the central axis Xis of the intake passage 13 and the rotation axis 32 of the valve shaft 62. The fuel pump 18 and the injector 19 can be placed in close proximity without interfering with the intake passage 13 and the throttle valve 62 and their associated components.

  The main body 17 defines a first body 22 that defines the upstream side of the intake passage 13 and supports the throttle valve 62, and a first body 22 that defines the downstream side of the intake passage 13 and is coupled to the first body 22 to support the injector 19. Two bodies 23 are provided. The first body 22 and the second body 23 are molded separately, and the first body 22 and the second body 23 are coupled to each other after molding. Compared with the case where the entire body 17 is molded as a single body, the molding process is simplified.

  DESCRIPTION OF SYMBOLS 13 ... Intake passage, 14 ... Fuel supply apparatus, 16 ... Fuel tank, 17 ... Main body, 18 ... Fuel pump, 18b ... Discharge port, 19 ... Injector, 22 ... 1st body, 23 ... 2nd body, 32 ... Rotation axis , 42 ... drive shaft, 49 ... electric motor, 57 ... fuel inlet, 58 ... rubber hose, 62 ... throttle valve, 63 ... valve shaft, 66 ... virtual plane, 67 ... one space, 68 ... other space, 69 ... Virtual plane, 71 ... one space, Xis ... (intake path) central axis.

Claims (6)

A body (17) defining an intake passage (13);
A fuel pump (18) coupled to the body (17) for sucking the fuel in the fuel tank (16) and discharging the fuel from the discharge port (18b);
An injector (19) coupled to the main body (17), facing the intake passage (13) at the tip, and injecting fuel introduced from the fuel introduction port (57) from the tip toward the intake passage (13); ,
A fuel hose (58) connected to the fuel introduction port (57) of the injector (19) and connected to the discharge port (18b) of the fuel pump (18) and curved at at least one location. Feeding device.   The fuel supply device according to claim 1, wherein the fuel pump (18) is arranged in one space (67) partitioned by a virtual plane (66) including a central axis (Xis) of the intake passage (13), The fuel supply device, wherein the injector (19) is arranged in the other space (68).   The fuel supply device according to claim 1 or 2, wherein the fuel pump (18) includes an electric motor (49) having a drive shaft (42) extending in parallel with a central axis (Xis) of the intake passage (13). A fuel supply device comprising:   The fuel supply device according to claim 3, wherein the fuel pump (18) has the discharge port (18b) at one end close to the injector (19) parallel to the drive shaft (42). Fuel supply device. The fuel supply device according to claim 4, wherein
A butterfly throttle valve (62) having a valve body rotatably supported by the main body (17) by a valve shaft (63) crossing the intake passage (13) and having a valve body disposed in the intake passage (13) is provided. ,
The fuel pump (18) and the one of the space (71) partitioned by a virtual plane (69) including a central axis (Xis) of the intake passage (13) and a rotation axis (32) of the valve shaft (63) A fuel supply device, characterized in that the injector (19) is arranged. The fuel supply device according to claim 5, wherein the main body (17) defines an upstream side of the intake passage (13) and supports the throttle valve (62), and the intake body. A fuel supply device comprising: a second body (23) that partitions the downstream side of the road (13), is coupled to the first body (22), and supports the injector (19).

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