JP5968628B2 - Fuel supply device for internal combustion engine - Google Patents

Description

  The present invention relates to a fuel supply device for an internal combustion engine that pressurizes fuel in a fuel tank to a pressure at which the fuel can be injected into the internal combustion engine.

  In motorcycles, a method of injecting fuel using an injector is widely used. This fuel injection uses a fuel supply device composed of a pump unit and a drive unit that drives the pump unit, pressurizes the fuel from the fuel tank, and guides it to the engine (corresponding to an internal combustion engine). Recently, there is a tendency to arrange a pump unit and a drive unit on an intake pipe member that forms a part of an intake pipe of an engine so that fuel can be supplied from the vicinity of a fuel injection position.

  In many fuel supply apparatuses, a pump unit as disclosed in Patent Document 1 is attached so as to stand up along the radial direction of the intake pipe member, and a motor unit (driving unit) is attached to an end of the standing pump unit. And a structure in which a suction connection port body (receiving fuel from the fuel tank) and a return fuel connection port body (discharging return fuel) are provided at the end of the pump unit, and disclosed in Patent Document 2 The motor part (corresponding to the drive part) is mounted so that it projects to one side in the radial direction intersecting the intake pipe member, the pump part is assembled to the projecting end of this motor part, and the motor part is sucked A structure in which a connection port body and a return fuel connection port body are provided is used.

Japanese Utility Model Publication No. 4-54974 JP 2005-105987 A

Since such a fuel supply device has a heavy drive unit such as a motor unit and a solenoid unit, the fuel supply device is easily subjected to engine vibration, running vibration, and impact transmitted from the intake pipe member.
However, each of the fuel supply devices disclosed in Patent Document 1 and Patent Document 2 has a problem in weight balance around the intake pipe member, and has low vibration resistance against vibration and impact transmitted from the intake pipe member.

  That is, the fuel supply device of Patent Document 1 has a layout in which a pump portion, a motor portion, a suction connection port body, and a return fuel connection port body protrude from one radial direction side of the intake pipe member. In particular, since a heavy motor unit is disposed at a point farthest from the intake pipe member, a rotational moment around the intake pipe member is likely to be generated in the fuel supply device due to a weight deviation. Moreover, when the fuel supply device is installed in the motorcycle, the suction connection port and the return fuel connection port are subjected to the weight of a hose member extending from the fuel tank and a stopper for stopping the hose member. Tends to increase, and a rotational moment tends to occur. For this reason, the fuel supply device lacks weight balance and is likely to shake with respect to vibration (engine vibration, running vibration, etc.) and impact transmitted from the intake pipe member.

Since the fuel supply device of Patent Document 2 is also laid out with a heavy motor portion, pump portion, suction connection port body, and return fuel connection port body from one side in the radial direction of the intake pipe member, Similarly, the fuel supply device tends to generate a rotational moment centered on the intake pipe member due to weight imbalance (such as poor weight balance), and is likely to shake due to vibration and impact transmitted from the intake pipe member.
SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply device for an internal combustion engine that has a simple structure and can improve vibration resistance against vibration and impact transmitted from an intake pipe member.

According to a first aspect of the present invention, in order to achieve the above object, the fuel supply device includes a pump unit configured to have a cylindrical plunger type pump unit that pressurizes fuel by reciprocating movement of the plunger, and reciprocating the plunger. A drive unit configured to have a motor unit that drives the pump unit, a suction connection port body that guides the suction fuel to the pump unit, and a return connection port body that discharges return fuel from the pump unit, a plunger pump, the outer peripheral portion of the intake pipe member constituting a part of an intake pipe of an internal combustion engine, is supported to the axial direction of the plunger pump unit and the axial direction of the intake pipe member intersect, A motor part constituting a drive part is provided at one end of the plunger type pump part intersecting with the intake pipe member, and a suction connection port body and a return connection port body are provided at the other end part of the intersecting plunger type pump part. Establishment It was adopted configuration.

  According to this configuration, the weight of the pump part is distributed to both sides around the intake pipe member. A heavy drive unit is arranged at one end of the pump unit, and a suction connection port connected to a hose member extending from the fuel tank and a return connection port are arranged at the other end on the opposite side. The Thus, in a state where the fuel supply device is installed in a vehicle such as a motorcycle, not only the weight of the suction connection port body and the return connection port body is added to the other end portion of the pump unit, but also to these connection port bodies. The weight of a hose member to be connected and a stopper for stopping the hose member is added. For this reason, the other end side of the pump part with various connection ports and the one end side of the pump part with the drive part are easily balanced in weight, and can be driven only by restraint with a hose member extending from the fuel tank. The vibration of the part is suppressed, and the pump part and the drive part are less likely to shake due to vibration and impact from the intake pipe member.

According to the invention of claim 2 , in addition to the above object, the motor portion is substantially L-shaped along the circumferential direction of the intake pipe member from one end portion of the plunger type pump portion so that the fuel supply device is more difficult to shake. The center of gravity of the motor part is moved toward the intake pipe member.
According to a third aspect of the present invention, in addition to the above-mentioned object, the plunger-type pump unit is also a pressure regulator that maintains the discharged fuel at a predetermined pressure on the other end side where the suction connection port body and the return connection port body are disposed. It was set as the structure which has.

According to the invention of claim 4 , in addition to the above object, similarly, the motor part and the plunger type pump part are respectively arranged on the outer peripheral part of the intake pipe member.
According to the invention of claim 5 , in addition to the above-mentioned object, the motor part and the plunger type pump part have a circular locus centering on the axis of the intake pipe member so that the vibration of each part of the fuel supply device can be effectively suppressed. It was decided to be placed on top.

According to a sixth aspect of the present invention, in addition to the above object, an injector is disposed in an intermediate portion of the plunger-type pump section that intersects with the intake pipe member so that the fuel supply device that has a simple structure and is difficult to shake can be fixed. In the intake pipe part, it is installed so as to be able to inject, and in the support part, there is a stop part for connecting the parts where the plunger type pump part on the opposite side of the injector and the intake pipe member intersect, and a plunger type pump for the motor part. Using a structure with a steady rest that suppresses run-out as a fulcrum

According to the seventh aspect of the invention, in addition to the above object, the plunger type pump part has a diaphragm type pump part that assists the suction of the plunger type pump part so as to enhance the suction function of the plunger type pump part.

According to the first aspect of the present invention, the fuel supply device not only distributes the weight of the pump portion to both sides around the intake pipe member, but also when the fuel supply device is installed in a vehicle such as a motorcycle. In addition to the weight of the suction connection port body and the return connection port body, the other end of the housing is added with the weight of a hose member connected to the connection port body and a stopper for stopping the hose member. The other end side of the pump part having the mouth and the one end side of the pump part having the driving part are easily balanced in weight. Thereby, the shake of a pump part and a drive part is suppressed only by restraint with the hose member extended from a fuel tank. That is, when the pump unit and the drive unit are installed in a vehicle such as a motorcycle, the pump unit and the drive unit are less likely to shake due to vibration and impact from the intake pipe member.
Therefore, the fuel supply device has a simple structure in which the pump unit, the drive unit, the suction connection port body, and the return connection port body are arranged in a balanced manner, improving vibration resistance against vibration and impact transmitted from the intake pipe member, More specifically, it is possible to improve the vibration resistance in a state where the vehicle is installed in a vehicle such as a motorcycle.

In addition , it is possible to improve the vibration resistance in the fuel supply device using the plunger type pump unit, which has a simple structure and it is difficult to ensure the weight balance. In particular, the cylindrical plunger-type pump part has a center of gravity position close to the intake pipe member due to the horizontal crossing arrangement, and the pump part itself is also hardly shaken, so that the overall vibration resistance of the fuel supply device is increased.

According to the second aspect of the present invention, since the heavy motor part is brought closer to the intake pipe member, the position of the center of gravity of the motor part approaches the intake pipe member. Thereby, the rotation moment centering on the intake pipe member generated in the plunger type pump part is suppressed, and the fuel supply device is more difficult to shake.
According to the third aspect of the present invention, the heavy pressure regulator is disposed on the other end side of the plunger-type pump having the suction connection port body and the return connection port body, so that the opposite side (motor part) ) And weight. As a result, the fuel supply device can be made more difficult to shake by utilizing the pressure regulator.

According to the fourth aspect of the present invention, the rotational moment generated in the motor part and plunger type pump part centering on the intake pipe member is suppressed, and the fuel supply device becomes more difficult to shake.
According to the fifth aspect of the present invention, each part of the fuel supply device is more difficult to shake.

According to the sixth aspect of the present invention, by utilizing the fuel supply device that is difficult to shake, the installation of the injector, the swing that suppresses the shake of the stopper or the motor that connects the portions where the plunger-type pump portion and the intake pipe portion intersect, are suppressed. The entire fuel supply device can be firmly fixed to the intake pipe portion with a simple structure using only the stopper.
According to the seventh aspect of the present invention, the suction function of the plunger type pump unit is enhanced, and the fuel in the fuel tank can be appropriately supplied from any fuel tank to the injector.

The side view which shows the fuel supply apparatus which concerns on one Embodiment of this invention with the motorcycle which mounts the apparatus. The perspective view which similarly shows the external appearance and internal structure of a fuel supply apparatus. The disassembled perspective view which shows the state which similarly removed the fuel supply apparatus from the intake pipe member. Sectional drawing seen from the AA line in FIG. Sectional drawing which shows the plunger-type pump part, diaphragm-type pump part, suction connection port body, return connection port body, pressure regulator, and motor part (part) which follow the BB line in FIG.

Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
FIG. 1 is a side view (schematic) of a vehicle, for example, a motorcycle, on which a fuel supply device to which the present invention is applied is installed. An arrow F in FIG. 1 indicates the front direction of the motorcycle, and an arrow R indicates the rear direction of the motorcycle.

  First, the motorcycle shown in FIG. 1 will be described. The motorcycle has a main frame member extending in the front-rear direction, for example, a main tube member 1 (only a part is shown). A front wheel 5 is suspended from a front end of the main tube member 1 via a front fork 3, and a rear wheel 9 is suspended from a rear end of the main tube member 1 via a swing arm member 7.

  A fuel tank 11 and a seat 12 are installed on the main tube member 1 in order from the front side. Incidentally, an acceleration / deceleration system (not shown) such as a brake pedal and a throttle grip is provided on one side (right side) sandwiching the main tube member 1, and a speed change system (not shown) such as a clutch lever and shift pedal is provided on the opposite side (left side). Not).

  In a space surrounded by the down tube member 1a extending downward from the main tube member 1 and the fuel tank 11, an internal combustion engine, for example, a single-cylinder reciprocating engine 13 (hereinafter simply referred to as the engine) in which a piston 13a is reciprocally moved. 13) is installed. A short pipe member 15 (corresponding to an intake pipe member of the present application) and a throttle valve device 17 are sequentially connected to a side portion of the engine 13, and an intake port (not shown) of the engine 13 and an air cleaner (not shown) are connected. An intake pipe that communicates with each other is formed.

A fuel supply device 21 is installed in the short tube member 15 together with an electronically controlled injector 19 so that fuel can be injected into the short tube member 15.
The perspective view of FIG. 2 shows the entire fuel supply device 21 and the internal structure (dotted line portion), and the exploded perspective view of FIG. 3 shows the fuel supply device 21 removed from the short tube member 15. 4 and 5 show the respective parts of the fuel supply device 21 (cross sections taken along lines AA and BB in FIG. 2).

  The fuel supply device 21 will be described with reference to FIGS. 2 to 5. The fuel supply device 21 includes a pump unit 25, a drive unit 27 that drives the pump unit 25, and tubular suction ports that are various connection ports. A connection port body 29 and a return connection port body 31 are provided. Incidentally, the pump part 25 and the drive part 27 are separate bodies. The pump unit 25, the drive unit 27, and the connection port bodies 29 and 31 are disposed on the outer peripheral portion of the short tube member 15.

The pump unit 25 and the drive unit 27 will be described. The pump unit 25 has a cylindrical pump body 33 as shown in FIGS. 2 and 5. The pump main body 33 has a split structure divided into two in the axial direction. Reference numerals 33a and 33b denote divided main body portions and lid portions.
The pump unit 25 includes a plunger-type pump unit 35 that houses various pump parts along the axial direction of the pump body 33. This plunger type pump part 35 has a diaphragm type pump part 49 on one end side sandwiching the pump parts of the plunger type pump part 35 and a pressure regulator 61 on the other end side, and is configured in a short cylinder shape. (Figs. 2 and 3).

  That is, as shown in FIG. 5, the plunger-type pump unit 35 has a cylindrical sleeve 37 incorporated along the axial direction of the pump body 33 with one end portion as a suction side and the other end portion as a discharge side. The sleeve 37 is configured to include a cylindrical plunger 39 that is reciprocally movable, a suction valve 41 that is assembled in the lumen of the plunger 39, and a discharge valve 43 that is assembled on the discharge side of the sleeve 37. The That is, when the plunger 39 reciprocates, the plunger pump unit 35 causes the fuel (suction fuel) in the plunger 39 to be guided to the pressurizing chamber 45 formed at the sleeve end through the suction valve 41, and in the heating chamber 45. The structure is such that pressurized fuel is discharged from the discharge valve 43. The injector 19 is assembled to the pump body 33 of the plunger type pump unit 35.

  Incidentally, as shown in FIG. 5, the diaphragm-type pump unit 49 includes a diaphragm chamber 51 formed on the suction side of the sleeve 37, a diaphragm 53 provided so as to close the diaphragm chamber 51, and a central portion of the diaphragm 53 at the end of the plunger 39. It has the structure which has the suction valve 57 connected to the diaphragm chamber 51 through the column-shaped fixing tool 55 fixed to the inside, and the channel | path 57a. That is, when the plunger 39 reciprocates, the diaphragm pump unit 49 sucks fuel from the suction valve 57 and guides it into the plunger 39 by the pumping operation in the diaphragm chamber 51 caused by the amplitude of the diaphragm 51. The diaphragm type pump part 49 helps the insufficient suction function of the plunger type pump part 35. The diaphragm chamber 51 also communicates with a return fuel discharge valve 59 through a passage 59a.

  Further, as shown in FIG. 5, the pressure regulator 61 uses a structure in which a discharge chamber 63 formed on the outlet side of the discharge valve 43 is closed with a diaphragm 67 with a relief valve 65, and the diaphragm 67 is pressed by a spring member 69. It has been. That is, when the discharge fuel in the discharge chamber 63 is kept at a predetermined pressure due to the displacement of the diaphragm 67 and becomes an excessive fuel pressure, the fuel of the same pressure is released to the spring chamber 71 containing the spring member 69 through the relief valve 65. The discharge chamber 63 communicates with the inlet portion of the injector 19 through a passage 19a and a connection port portion 33c (a portion where the base portion of the injector 19 is fitted) formed in the pump body 33 described later, and has a predetermined pressure. The fuel is supplied to the injector 19.

  As shown in FIG. 2, for example, a cylindrical motor unit 27 a in which a DC motor 75 is housed in a cylindrical motor case 73 is used for the drive unit 27. A cam mechanism 77 (conversion mechanism) that converts rotational motion into reciprocating motion is built in the end of the motor case 73 where the output shaft of the DC motor 75 is disposed. Here, the cam mechanism 77 is configured by, for example, assembling an eccentric cam 79 on the output shaft of the DC motor portion 75 and fitting a frame-shaped cam receiving member 81 to the eccentric cam 79. Is converted to reciprocating motion. The output portion of the cam receiving member 81 is disposed on the end portion of the motor case 73, here on the side portion perpendicular to the axial direction of the motor portion 27a.

The cylindrical pump unit 25, the cylindrical drive unit 27, and the connection ports 29 and 31 are assembled so as to ensure sufficient vibration resistance in a state where they are installed in the motorcycle.
In order to ensure this vibration resistance, the layout of each part of the fuel supply device 21 is devised.

  In this device, as shown in FIGS. 2 to 4, the pump part 25 is arranged so as to intersect with the axial direction of the short pipe member 15, and one end of the pump part 25 intersecting with the short pipe member 15 is arranged. A layout is used in which a motor part 27a (drive part 27) is provided in the part, and a suction connection port body 29 and a return connection port body 31 are provided in the other end of the pump part 25 on the opposite side.

  That is, as shown in FIGS. 2 to 4, the intermediate portion (axial direction) of the pump portion 25 is disposed on the upper part of the outer peripheral portion of the short tube member 15 so as to cross the axial direction of the short tube member 15. Is done. Specifically, the cylindrical plunger-type pump unit 35 is arranged in a lateral direction in which the axial center direction of the plunger-type pump unit 35 and the axial center direction of the short tube member 15 intersect each other, for example, orthogonally intersect with each other. It is attached to the pipe member 15 (arrangement with a low center of gravity). Incidentally, the plunger type pump part 35 is located closest to the outer peripheral part of the short tube member 15 and is arranged at the lowest center of gravity as possible.

  On the other hand, as shown in FIG. 2 to FIG. 5, the motor unit 27 a allows the side portion of the motor case 73 having the output unit of the cam mechanism 75 to be connected to the plunger 39 so that the driving force is transmitted from the motor unit 27 a to the plunger 39. It is connected to the end of the pump body 33 having an input part. The entire motor unit 27 a is arranged along the downward direction and is arranged in a different vertical direction from the plunger-type pump unit 35. With this layout, the entire pump part 27 a is arranged in a substantially L shape along the circumferential direction of the outer peripheral part of the intake pipe member 25, and the position of the center of gravity of the motor part 27 a is brought close to the intake pipe member 25. Incidentally, the motor part 27 a is closest to the outer peripheral part of the short tube member 15.

  On the other hand, as shown in FIGS. 2 to 5, the suction connection port body 29 and the return connection port body 31 are end portions on the opposite side to the motor unit 27 a in the plunger pump unit 35 (pump unit 25). It is formed integrally with the end surface of (lid portion 33b) and protrudes forward from the end surface. Of these, the suction connection port body 29 communicates with the suction valve 57. A fuel supply hose member 85 (only a part of which is shown by a two-dot chain line) extending from the lower part of the fuel tank 11 is connected to the suction connection port body 29 with a stopper 86 such as a hose band (two in FIG. 4). The fuel in the fuel tank 11 can be guided to the plunger-type pump unit 35 through the suction connection port body 29 and the diaphragm-type pump unit 49.

  As shown in FIGS. 2 to 5, the return connection port body 31 communicates with the discharge valve 59. A return hose member 87 extending from the fuel tank 11 (only a part of which is shown by a two-dot chain line) is connected to the return connection port 31 by a stopper 88 such as a hose band. The excess fuel that is not sucked from the plunger-type pump portion 35 is recovered from the return connection port 31 to the fuel tank 11. Incidentally, the fuel escaping from the relief valve 65 (pressure regulator 61) is also collected through the return connection port 31.

When the fuel supply device 21 configured as described above is installed in a motorcycle (FIGS. 1 and 2), the fuel supply device 21 itself exhibits considerable vibration resistance only by the layout of each part.
That is, as shown in FIGS. 1 and 2, the weight of the plunger-type pump part 35 (pump part 25) is distributed to the left and right sides around the short pipe member 15 that intersects the pump part 35. In the state where the fuel supply device 21 is installed in the motorcycle, since the motor unit 27a is arranged on one end side of the plunger-type pump unit 35 (pump unit 25), the weight balance seems to be deteriorated. The weights of the suction connection port body 29 and the return connection port body 31 are added to the other end portion of the pump section 35 (pump section 25). In addition, the weights of the hose members 85 and 87 (down from the fuel tank 11) connected to the connection ports 29 and 31 and the stoppers 86 and 88 for stopping the hose members 85 and 87 are added. Therefore, it becomes easy to balance in weight with the opposite one end side where the heavy motor part 27a is arranged. This is because the position of the plunger type pump part 35 (pump part 25) intersecting with the short pipe member 15 is determined at a point where a weight balance is easily obtained. Due to this weight balance, the swing of the plunger type pump part 35 and the motor part 27 a can be suppressed only by restraint by the hose members 85 and 87 extending from the fuel tank 11.

That is, when the plunger-type pump unit 35 and the motor unit 27a (drive unit 27) are mounted (installed) on the motorcycle, the plunger-type pump unit 35 and the motor unit 27a (drive unit 27) are resistant to vibration (engine vibration, running vibration, etc.) and impact transmitted from the short pipe member 15. It becomes difficult to shake.
Therefore, the fuel supply device 21 has a simple structure in which the plunger pump 35 (pump unit 25), the motor unit 27a (drive unit 27), the suction connection port body 29, and the return connection port body 31 are arranged in a balanced manner. Thus, it is possible to improve the vibration resistance against vibrations and shocks transmitted from the short pipe member 15 under the state of being mounted on a motorcycle.

  Ensuring this vibration resistance is effective for the fuel supply device 21 that uses the cylindrical plunger-type pump unit 35, which is difficult to ensure the weight balance, and that uses the heavy motor unit 27a. In addition, the cylindrical plunger-type pump unit 35 is disposed laterally so that the position of the center of gravity is lowered, and the plunger-type pump unit 35 as a whole is difficult to shake (relative to the vertical direction). The overall vibration resistance is further increased. In addition, the motor portion 27a is arranged in an approximately L shape along the circumferential direction of the short tube member 15, so that the position of the center of gravity of the motor portion 27a also approaches the short tube member 15 and the rotational moment about the short tube member 15 is obtained. Therefore, the fuel supply device 21 is less likely to shake, and the vibration resistance is further improved.

  In particular, when the pressure regulator 61 is disposed on the end side of the plunger-type pump portion 35 where the suction connection port body 29 and the return connection port body 31 are disposed, the fuel supply device 21 has the weight of the pressure regulator 61 as well as the plunger. Since it is added to the other end portion of the pump section 35 (pump section 25), it becomes easier to balance with the opposite side (motor section 27a) in terms of weight. That is, the entire fuel supply device 21 makes use of the pressure regulator 61 to make it more difficult to shake and improve vibration resistance.

  In addition, the fuel supply device 21 has a plunger type centered on the short pipe member 15 when the plunger type pump part 35 and the motor part 27a are arranged at points closest to the outer peripheral part of the short pipe member 15, respectively. Since the rotational moment generated in the pump part 35 and the motor part 27a can be suppressed, the fuel supply device 21 becomes more difficult to shake and the vibration resistance is improved. In particular, as shown in FIG. 4, when the plunger-type pump unit 35 and the motor unit 27 a are arranged on a circular locus that is closest to the outer peripheral portion of the short tube member 15 around the axis of the short tube member 15. The vibration of each part of the fuel supply device 21 centering on the short tube member 15 is effectively suppressed, and the vibration resistance is effectively enhanced.

  Moreover, when the diaphragm pump unit 37 is provided in the fuel supply device 21, the insufficient suction function of the plunger pump unit 35 is enhanced. Therefore, the fuel supply device 21 is located at a position considerably higher than the fuel supply device 21. The fuel supply device 21 as shown in FIG. 1 is not limited to a motorcycle having a tank, and even when the fuel supply device 21 is substantially at the same height as the lower portion of the fuel tank 11, the fuel can be reliably supplied. Regardless of the position, the fuel in the fuel tank 11 can be properly supplied to the injector 19. That is, the fuel supply device 21 having high vibration resistance and high wearability can be provided.

  In addition, in the fuel supply device 21 having such a layout that is difficult to shake, the fuel supply device 21 is fixed by simply using the injector 19 assembled to the plunger pump unit 35 at the support portion 91 and simply using the plunger pump. A simple structure is sufficient in which the portion 35 and the motor portion 27a are stopped by the short pipe member 15.

  That is, as shown in FIGS. 2 to 4, the injector 19 includes an intermediate portion (intersection portion) of the plunger-type pump portion 35 that intersects the intake pipe portion 15, that is, one end side and the other end portion of the plunger-type pump portion 35. It is disposed in an intermediate portion where the side is substantially balanced in weight, and is attached in an oblique direction by connecting the tip injection portion 19a to the intake pipe portion 15 in communication. For the attachment of the injector 19, a connecting port body 33c (only part of which is shown in FIGS. 2 and 3) is provided in the middle part (axial direction) of the pump body 33 so that the base of the injector 19 can be inserted and removed. The wall portion of the short tube member 15 is provided with a tip support portion 15a (only a part of which is shown in FIGS. 2 and 3) into which the injection portion 19a of the injector 19 is removably fitted.

  As shown in FIGS. 2 to 4, the support portion 91 includes a stop portion 93 that connects portions where the plunger-type pump portion 35 and the short tube member 15 on the opposite side of the injector 19 intersect, and a plunger-type pump portion. The anti-sway part 97 is configured to suppress the shake of the motor part 27a with the shaft center of 35 as a fulcrum. Specifically, the stop portion 93 is provided with, for example, a plate-like bracket portion 95 protruding from the outer peripheral portion of the intermediate portion of the pump main body 33, a base-like mounting seat 98 provided on the outer peripheral portion of the short tube member 15, and a bolt A structure in which the bracket portion 95 is fastened to the mounting seat 98 by screwing the member 99 is used.

  Further, as shown in FIG. 3, the steadying portion 97 is provided with, for example, a pin portion 101 in parallel on the side of the motor portion 27 a adjacent to the short tube member 15, and the same pin is provided on the outer peripheral portion of the short tube member 15. A structure is used in which a pin receiving seat 103 for receiving the portion 101 is provided and the pin portion 101 is inserted into a pin hole 103 a formed in the pin receiving seat 103 when the plunger type pump portion 35 is attached. It is done.

Incidentally, the directions of the bracket portion 95, the screw hole 98a of the mounting seat 98, the pin portion 101, and the pin hole 103a are all set to the same oblique direction as the assembly direction (oblique direction) of the injector 19.
As a result, the fuel supply device 21 as a whole is restricted by “installation of the injector 19 in the horizontal direction of the plunger-type pump unit 35” and by bolting “in the up-and-down direction of the plunger-type pump unit 35”. ) ”, And the pin portion 101 can be firmly fixed with a simple structure in which the number of fixing points,“ suppression of vibration (front-rear direction) of the motor portion 27a with the plunger pump portion 27a as a fulcrum ”, is suppressed to a minimum number.

  Note that the present invention is not limited to one embodiment, and various modifications may be made without departing from the spirit of the present invention. For example, in one embodiment, an example in which the fuel supply device is provided in a short pipe member (an intake pipe member that constitutes a part of the intake pipe) separate from the throttle valve device has been described. The fuel supply device may be provided in the valve body (intake pipe member constituting a part of the intake pipe) of the apparatus, and in this way, the same effect as that of the embodiment can be obtained.

15 Short pipe member (intake pipe member)
19 Injector 21 Fuel Supply Device 27a Motor Unit (Drive Unit)
29 Connection Port for Suction 31 Connection Port for Return 35 Plunger Type Pump Unit (Pump Unit)
37 Diaphragm type pump part 61 Pressure regulator 93 Stop part 97 Stabilization part

Claims (7)

A pump unit configured to have a cylindrical plunger-type pump unit that pressurizes fuel by reciprocating movement of the plunger; and a drive unit configured to include a motor unit configured to reciprocately drive the plunger, and to drive the pump unit. A suction connection port body that guides the suction fuel to the pump unit, and a return connection port body that discharges return fuel from the pump unit,
The plunger pump unit, the outer peripheral portion of the intake pipe member constituting a part of an intake pipe of an internal combustion engine, so that the axial direction of the axial direction and the intake pipe member of the plunger pump unit intersects Support,
At one end of the plunger-type pump section intersecting with the intake pipe member, the motor section constituting the driving section is provided,
The fuel supply device for an internal combustion engine, characterized in that the suction connection port body and the return connection port body are provided at the other end of the intersecting plunger type pump section . The motor unit is arranged in an approximately L shape along the circumferential direction of the intake pipe member from one end of the plunger pump unit, and the center of gravity of the motor unit is brought close to the intake pipe member. The fuel supply device for an internal combustion engine according to claim 1 , wherein the fuel supply device is an internal combustion engine. The plunger pump unit, the other end side disposed in the suction connection opening member and the return connection opening member according to claim 1 or claim characterized in that it comprises a pressure regulator to keep the discharge fuel to a predetermined pressure Item 3. A fuel supply device for an internal combustion engine according to Item 2 . The motor unit and the plunger pump unit, the fuel supply system for an internal combustion engine according to claim 2, characterized in that the outer periphery of each of the intake pipe member are then placed. 5. The fuel supply device for an internal combustion engine according to claim 4 , wherein the motor unit and the plunger type pump unit are arranged on a circular locus centering on an axis of the intake pipe member. Having an injector for injecting fuel pressurized by the plunger type pump part into the intake pipe member, and further having a support part for supporting the plunger type pump part and the motor part on the intake pipe member,
The injector is disposed in an intermediate portion of the plunger-type pump section that intersects the intake pipe portion, and is installed so as to be able to inject into the intake pipe portion.
The support portion includes a stop portion that connects portions where the plunger-type pump portion on the opposite side of the injector and the intake pipe member intersect each other, and a swing that suppresses vibration about the plunger-type pump portion of the motor portion as a fulcrum. The fuel supply device for an internal combustion engine according to any one of claims 2 to 5 , wherein the fuel supply device is configured to have a stop portion. The fuel supply device for an internal combustion engine according to any one of claims 1 to 6 , wherein the plunger-type pump unit includes a diaphragm-type pump unit that assists the suction of the plunger-type pump unit.

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