WO2013108721A1

WO2013108721A1 - Fuel injection device for internal combustion engine

Info

Publication number: WO2013108721A1
Application number: PCT/JP2013/050446
Authority: WO
Inventors: 加藤　裕史; 友也佐藤
Original assignee: 株式会社ミクニ
Priority date: 2012-01-19
Filing date: 2013-01-11
Publication date: 2013-07-25
Also published as: CN104066967A; MY167834A; CN104066967B; PH12014501645B1; JP5985190B2; BR112014017400A8; PH12014501645A1; BR112014017400A2; JP2013148003A; IN2014DN05758A

Abstract

This fuel injection device is configured by having: a fuel pump (20) configured by having a reciprocal drive-type pump unit (35) that pressurizes fuel, arranged on the outer peripheral section of an intake pipe member (15) such that the reciprocal drive direction of the pump unit matches the peripheral direction of the outer peripheral section, and by having a drive unit (27a) that drives this pump unit arranged along the peripheral direction of the intake pipe member after the pump unit; and an injector (19) provided in the fuel pump, that injects the fuel from the fuel pump towards the intake pipe member.

Description

Fuel injection device for internal combustion engine

The present invention relates to a fuel injection device for an internal combustion engine in which fuel is pressurized and injected from an injector.

In motorcycles (vehicles), a method of injecting fuel using an injector is widespread. In this fuel injection device for injecting fuel, a structure in which an intake pipe member constituting an intake pipe of an engine (corresponding to an internal combustion engine) is provided with a fuel pump for pressurizing fuel and an injector for injecting pressurized fuel is used. It is done. In many fuel pumps, in order to secure a high fuel pressure, a reciprocating pump unit is used, and a structure in which the pump unit is driven by a driving unit such as a motor unit is used. Recently, in order to suppress the influence of vapor, reduce costs, or make it compact, an integrated structure in which an injector, a fuel injection unit, a reciprocating pump unit, and a driving unit are connected has become widespread. I am doing.

Many of these integrated fuel injection devices are configured such that, following the fuel injection portion provided in the intake pipe member as disclosed in Patent Document 1, the pump portion stands from one side in the radial direction of the intake pipe member. And a motor part (driving part) following a structure in which a motor part (corresponding to a driving part) is provided at the end of the standing pump part or an injector provided in an intake pipe member as disclosed in Patent Document 2. And the pump portion is provided at the projecting end portion of the motor portion.

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

By the way, the engine of a motorcycle is housed in a limited space (engine room) surrounded by a fuel tank, a seat, a frame and the like. Engine accessories are also housed in this limited space. In other words, the fuel injection device attached to the engine is also housed in this limited space together with the engine accessories.
For this reason, in the fuel injection device, as much as possible around the intake pipe member, specifically, the intake pipe member so as not to interfere with surrounding equipment and objects, and so as not to affect the surrounding equipment. The compactness that suppresses projecting to the outside in the radial direction is required.

However, although the fuel injection device of Patent Document 1 is compact, the entire fuel pump, that is, the pump part and the motor part constituting the fuel pump are arranged in a biased manner on one radial side of the intake pipe member. Most of it protrudes from the one side in the radial direction of the intake pipe member. For this reason, this fuel injection device often interferes with surrounding equipment or objects or affects surrounding equipment, and tends to be difficult to mount on a motorcycle. In particular, a fuel injection device that uses an injector for the fuel injection portion and integrates the injector, the pump portion, and the drive portion further increases the overhang, making it more difficult to mount the fuel injection device on a motorcycle.

Since the fuel injection device of Patent Document 2 also has a pump part and a motor part of the fuel pump that protrude considerably biased toward one radial direction of the intake pipe member, the fuel injection apparatus is mounted on a motorcycle as in Patent Document 1. In this case, it often interferes with surrounding equipment and objects, and also affects surrounding equipment, and is difficult to mount on a motorcycle.
SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel injection device for an internal combustion engine that is excellent in mountability in a vehicle and is prevented from protruding from the intake pipe member to the surroundings (radially outward).

In order to achieve the above object, a fuel injection device according to a first aspect of the present invention is directed to a reciprocating pump type pump unit that pressurizes fuel at an outer peripheral part of an intake pipe member, and a pump part in a circumferential direction of the outer peripheral part. A fuel pump that is arranged along the reciprocating drive direction and a drive unit that drives the pump is arranged along the circumferential direction of the intake pipe member following the pump unit, and a fuel pump provided in the fuel pump And an injector for injecting the fuel from the inside into the intake pipe member.

According to this configuration, the pump part and the drive part of the fuel injection device are arranged along the circumferential direction of the intake pipe member.

In the invention of claim 2, the reciprocating drive type pump unit is configured to have a plunger type pump unit, and the plunger type pump unit intersects the axial direction of the intake pipe member at the outer peripheral portion of the intake pipe member. The drive unit is configured to have a motor unit, and the motor unit is arranged along the circumferential direction of the outer periphery of the intake pipe member from the end of the plunger pump. It is arranged in a substantially L shape.

The invention according to claim 3 is characterized in that the reciprocating pump unit and the drive unit are arranged closest to the outer periphery of the intake pipe member.
The invention according to claim 4 is characterized in that the pump part and the drive part are arranged on a circular locus centering on the axis of the intake pipe member.

The invention according to claim 5 is characterized in that the plunger type pump unit has a pressure regulator for keeping the discharged fuel at a predetermined pressure.
According to a sixth aspect of the present invention, the plunger type pump unit has a diaphragm type pump unit that assists the suction of the plunger type pump unit.

According to the invention of claim 1, since the fuel injection device is compactly assembled to the outer peripheral portion of the intake pipe member with a layout in which each part including the injector is prevented from protruding to the surroundings, the devices around the intake pipe member Interference with objects and objects, and influences on the devices and objects are avoided, and mounting on vehicles is easy.
Therefore, it is possible to provide a fuel injection device that is excellent in vehicle mountability and is prevented from protruding from the intake pipe member to the periphery (radially outward). In particular, this fuel injection device is effective for a vehicle such as a motorcycle, which is disposed in a considerably limited space (engine room).

According to the invention of claim 2, the vibration resistance in the fuel injection device using the plunger type pump unit, which is difficult to ensure the weight balance with a simple structure, can be improved. In particular, the cylindrical plunger-type pump part has a center of gravity position close to the intake pipe member due to the crossing arrangement in the horizontal direction, and the pump part itself is hardly shaken, so that the overall vibration resistance of the fuel injection device is increased.

According to the invention of claim 3, the fuel injection device can suppress not only the overhang of each part but also the pump part and the motor part centered on the intake pipe member, and has high vibration resistance. It can be obtained together.
According to the invention of claim 4, the fuel injection device can effectively improve the vibration resistance.

According to the fifth aspect of the present invention, even if the pressure regulator that discharges the fuel of the appropriate pressure from the injector is provided, the vehicle mountability is hardly changed.
According to the sixth aspect of the present invention, even if the diaphragm type pump part that assists the suction of the plunger type pump part is provided, the vehicle mountability is hardly changed.

The side view which shows the fuel-injection 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-injection apparatus. The disassembled perspective view which shows the state which removed the main part of the fuel-injection apparatus from the intake pipe member similarly. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. Sectional drawing which shows the plunger type pump part, diaphragm type pump part, pressure regulator, and motor part (part) along 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 injection 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.

The motorcycle shown in FIG. 1 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.

The fuel tank 11 and the seat 12 are installed on the main tube member 1 in order from the front side. 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). ) Is provided.

In a space (engine room) 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 reciprocating engine 13 in which a piston 13a is reciprocally mounted is installed. ing. A short pipe member 15 (corresponding to the intake pipe member of the present application) and a throttle valve device 17 are sequentially connected to the intake side of the engine 13, and these include an intake side port (not shown) of the engine 13 and an air cleaner (not shown). An intake pipe that communicates with each other is configured.

The short pipe member 15 is provided with each device constituting the fuel injection device 21, specifically, an electronically controlled injector 19, and a fuel pump 20 for supplying fuel to the injector 19. The injector 19, the fuel pump 20, Are integrally formed to constitute the fuel injection device 21. The fuel injection device 21 is installed using a limited space near the engine 13.
The perspective view of FIG. 2 shows the entire structure and internal structure (dotted line portion) of the fuel injection device 21, and the exploded perspective view of FIG. 3 shows a main body that is the main part of the fuel injection device 21 for a motorcycle. 4 and 5 are cross-sectional views of the fuel injection device 21 (cross sections taken along lines AA and BB in FIG. 2). It is shown.

The fuel injection device 21 will be described with reference to FIGS. 2 to 5. The fuel pump 20 includes a reciprocating pump unit 25 and a drive unit 27 that drives the pump unit 25 in series. .
Among these, the pump part 25 is comprised with the plunger-type pump part 35 which accommodated various pump components in the axial direction in the cylindrical pump main body 33, as FIG.2 and FIG.5 shows. The pump body 33 includes a body portion 33a and a lid portion 33b that are divided into two in the axial direction.

The plunger-type pump unit 35 has a diaphragm-type pump unit 49 on one end side across the pump parts of the pump unit 35 and a pressure regulator 61 on the other end side, and is configured in a cylindrical shape (see FIG. 2). 5). As shown in FIG. 5, the plunger-type pump unit 35 includes 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. A cylindrical plunger 39 accommodated in the sleeve 37 so as to be able to reciprocate, a suction valve 41 assembled in the lumen of the plunger 39, and a discharge valve 43 assembled on the discharge side of the sleeve 37. . In other words, when the plunger 39 is driven to reciprocate, the plunger pump unit 35 guides the fuel (suction fuel) in the plunger 39 through the suction valve 41 to the pressurizing chamber 45 formed at the sleeve end. And the pressurized fuel is discharged from the discharge valve 43. The injector 19 is assembled to the pump main body 33 of the plunger pump unit 35 and constitutes the main body of the fuel injection device 21 together with the drive unit 27.

As shown in FIG. 5, the diaphragm pump 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. A columnar fixing tool 55 to be fixed and a suction valve 57 communicating with the diaphragm chamber 51 through a passage 57a are provided. That is, when the plunger 39 reciprocates, the diaphragm type pump unit 49 amplifies the diaphragm 51, and 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. The diaphragm type pump unit 49 assists the insufficient suction function of the plunger type pump unit 35. The diaphragm chamber 51 also communicates with a return fuel discharge valve 59 through a passage 59a.

As shown in FIG. 5, the pressure regulator 61 has a structure in which the outlet of the discharge chamber 63 formed on the outlet side of the discharge valve 43 is closed by a diaphragm 67 with a relief valve 65, and the diaphragm 67 is pressed by a spring member 69. Is used. Specifically, the pressure regulator 61 is attached to the diaphragm chamber 64 in which the fuel discharged from the discharge chamber 63 communicates with the discharge port 63, that is, the diaphragm chamber 64 partitioned by the diaphragm 67, according to the biasing force of the spring member 69. It has a structure in which the pressure is regulated to a predetermined pressure at the stage toward the force-side chamber 62. Further, when the fuel discharged from the discharge chamber 63 becomes excessive fuel pressure, the pressure regulator 61 applies the same pressure to the opposite chamber partitioned by the diaphragm 67, that is, the spring chamber 71 containing the spring member 69 through the relief valve 65. It has a structure that allows fuel to escape. The discharge chamber 63 communicates with 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 main body 33, which will be described later. 19 is provided.

2, for example, as shown in FIG. 2, a cylindrical motor unit 27 a in which a DC motor 75 is housed in a cylindrical motor case 73 is used. 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, for example, by assembling an eccentric cam 79 to the output shaft of the DC motor unit 75 and fitting a frame-shaped cam receiving member 81 to the eccentric cam 79. Converts eccentric rotational motion 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 pump unit 25 and the drive unit 27 are assembled on the outer periphery of the short tube member 15 so as not to protrude as far as possible to the outside in the radial direction of the short tube member 15 as a periphery.
As a device for this, as shown in FIGS. 2 to 4, a structure in which the pump unit 25 and the drive unit 27 are arranged along the circumferential direction of the outer peripheral portion of the short tube member 15 is used.

Specifically, as shown in FIGS. 2 to 4, the plunger type pump unit 35 constituting the pump unit 25 intersects the axial direction of the short tube member 15 at the upper part of the outer peripheral portion of the short tube member 15. It is assembled sideways and is configured along the circumferential direction of the short tube member 15. In particular, the plunger-type pump unit 35 has a reciprocating drive direction of the pump unit 35 (a direction in which the plunger 39 is reciprocated), here an intermediate part in the axial direction of the plunger-type pump part 35 and the axial direction of the short tube member 15. Are crossed, for example, orthogonally crossed, along the outer peripheral portion of the short tube member 15.

As shown in FIGS. 2 to 5, the motor unit 27 a constituting the driving unit 27 is arranged in an approximately L shape along the circumferential direction of the outer peripheral portion of the short tube member 15 from the end of the plunger type pump unit 35. In this manner, the plunger type pump unit 35 is provided along the circumferential direction of the outer peripheral portion of the short tube member 15 following the plunger pump unit 35. Specifically, the motor unit 27 a transmits the driving force from the motor unit 27 a to the plunger 39, the side of the motor case 73 having the output unit of the cam mechanism 75 is connected to the side of the pump main body 33 having the input unit of the plunger 39. It is configured to be connected to the end. As a result, the motor part 27 a is arranged along the downward direction, and the entire motor part 27 a is arranged along the outer peripheral part of the short tube member 25 in a vertical arrangement different from the plunger pump part 35.
The plunger pump part 35 and the motor part 27a are both closest to the outer peripheral part of the short tube member 15.

A suction connection port body 29 and a return connection port body 31 project from the end (the lid portion 33b) of the plunger pump unit 35 on the side opposite to the motor unit 27a of the plunger pump unit 35. Yes. The suction connection port body 29 communicates with the suction valve 57, and the return connection port body 31 communicates with the discharge valve 59. Among them, the suction connection port body 29 includes a fuel supply hose member 85 (only a part of which is shown by a two-dot chain line) extending from the lower portion of the fuel tank 11 and a stopper 86 such as a hose band (two in FIG. 4). And are connected by a dotted line). As a result, the fuel in the fuel tank 11 is guided to the suction connection port body 29. In addition, the return connection port 31 is configured by connecting a return hose member 87 (only a part of which is shown by a two-dot chain line) extending from the fuel tank 11 by a stopper 88 such as a hose band. As a result, the fuel from the discharge valve 59, that is, excess fuel from the diaphragm pump unit 49 that is not sucked from the plunger pump unit 35 is collected into the fuel tank 11. The fuel escaping from the relief valve 65 also goes to the return connection port 31.

The fuel injection device 21 is fixed to the short tube member 15 with a structure that stops the injector 19, the plunger pump unit 35, and the motor unit 27a. Specifically, as shown in FIGS. 2 to 4, the injector 19 is fitted with a connection port 33c formed at the intermediate portion of the plunger-type pump portion 35 at the base portion, and the injection portion 19a at the tip portion is connected to the short tube member 15. It is supported so that it may fit in the support opening 15a (only one part is shown in FIG.2, 3) formed in the wall part. The plunger type pump part 35 is supported by connecting the middle part opposite to the injector 19, and the motor part 27 a is supported by suppressing the swing about the axis of the plunger type pump part 35 as a fulcrum. Yes. For example, the plunger-type pump part 35 has a plate-like bracket part 95 protruding from the outer peripheral part of the intermediate part of the pump main body 33, a base-like mounting seat 98 provided on the outer peripheral part of the short tube member 15, and the bolt member 99. The bracket portion 95 is supported so as to be fastened to the mounting seat 98 by screwing. In addition, the motor portion 27a is provided with a pin portion 101 in parallel on the side portion of the motor portion 27a adjacent to the short tube member 15, for example, and a pin receiving seat 103 that receives the pin portion 101 on the outer peripheral portion of the short tube member 15 is provided. As the plunger pump unit 35 is attached, the pin unit 101 is supported by the short tube member 15 by a motor steadying structure in which the pin unit 101 is inserted into the pin hole 103a formed in the pin receiving seat 103 (FIG. 3). ).

In the fuel injection device 21 configured as described above, since the plunger type pump unit 35 and the motor unit 27a are laid out along the circumferential direction of the short tube member 15, each part including the injector 19 of the fuel injection device 21 includes In addition, it does not protrude from the periphery (outside) of the short tube member 15 only in a specific direction. That is, as shown in FIGS. 2 and 4, the entire fuel injection device 21 can be compactly assembled to the outer peripheral portion of the short tube member 15 with a layout that suppresses overhanging as much as possible. .

Therefore, even if the fuel injection device 21 is required to be installed in a fairly limited space near the engine 13, it can be installed without interfering with or affecting the surrounding devices and objects. It is possible and easy to wear. In particular, when the intermediate part of the plunger type pump part 35 is arranged on the short pipe member 15, the overhang is considerably suppressed. As a result, the fuel injection device 21 can be easily mounted in the engine room and has a considerably excellent vehicle mounting property. The fuel injection device 21 is effective for a vehicle such as a motorcycle in which the fuel injection device 21 is required to be disposed in a very limited small space near the engine 13.

In particular, even in the fuel injection device 21 using the plunger-type pump unit 35 that is difficult to suppress overhang, the reciprocating drive direction of the pump unit 35 is linearly along the circumferential direction of the short tube member 15, and this tangent line. By arranging the motor part 27a in an approximately L shape along the circumferential direction of the short pipe member 15 from the end of the plunger type pump part 35 arranged in the direction, it is possible to easily connect the devices and objects around the short pipe member 15 Interference or influence on the device or object is avoided, and mounting on a vehicle such as a motorcycle becomes easy.

Moreover, in such a substantially L-shaped fuel injection device 21, the vehicle mountability includes a pressure regulator 61 that discharges fuel of an appropriate pressure and a diaphragm pump unit 37 that assists the suction of the plunger pump unit 35. But almost no change.

In addition, the plunger-type pump unit 35 and the motor unit 27a are arranged closest to the outer periphery of the short tube member 15, respectively, and the rotational moment generated in the plunger-type pump unit 35 and the motor unit 27a with the short tube member 15 as the center. Therefore, even if the fuel injection device 21 as a whole is subjected to engine vibration or traveling vibration transmitted from the short tube member 15, it is difficult to shake, and the vibration resistance of the fuel injection device 21 itself is considerably improved. In particular, as shown in FIG. 4, the plunger-type pump unit 35 and the motor unit 27 a are arranged on a circular locus closest to the outer peripheral portion of the short tube member 15 centering on the axis of the short tube member 15. Thus, the vibration of each part of the fuel injection device 21 around the short pipe member 15 is effectively suppressed, and the vibration resistance is effectively enhanced.

It should be noted 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 the above-described embodiment, the fuel injection device is provided in the short pipe member (the intake pipe member constituting the intake pipe) separate from the throttle valve apparatus. You may provide a pump part, a drive part, and an injector in the valve body (intake pipe member which comprises an intake pipe).

15 Short pipe member (intake pipe member)
DESCRIPTION OF SYMBOLS 19 Injector 20 Fuel pump 21 Fuel injection apparatus 27a Motor part (drive part)
35 Plunger type pump part (pump part)
37 Diaphragm type pump part 61 Pressure regulator

Claims

A fuel injection device for an internal combustion engine,
An intake pipe member constituting the intake pipe of the internal combustion engine;
A reciprocating pump unit that pressurizes fuel; and a drive unit that drives the pump unit. The pump unit is disposed on an outer peripheral part of the intake pipe member in a circumferential direction of the outer peripheral part. A fuel pump configured to be arranged along the reciprocating drive direction of, and arranged along the circumferential direction of the intake pipe member following the pump unit, and
And an injector that is provided in the fuel pump and injects fuel from the fuel pump into the intake pipe member.
A fuel injection device for an internal combustion engine according to claim 1,
The reciprocating pump unit is configured to have a plunger pump unit,
The plunger-type pump part is disposed on the outer peripheral part of the intake pipe member along a reciprocating drive direction in a direction intersecting with an axial direction of the intake pipe member,
The drive unit is configured to have a motor unit,
The motor portion is arranged in a substantially L shape along the circumferential direction of the outer peripheral portion of the intake pipe member from the end portion of the plunger pump.
A fuel injection device for an internal combustion engine according to claim 1 or 2,
The reciprocating pump type pump unit and the driving unit are respectively arranged closest to the outer peripheral portion of the intake pipe member.
A fuel injection device for an internal combustion engine according to any one of claims 1 to 3,
The reciprocating pump unit and the driving unit are arranged on a circular locus centering on an axis of the intake pipe member.
A fuel injection device for an internal combustion engine according to any one of claims 2 to 4,
The plunger-type pump unit includes a pressure regulator that keeps discharged fuel at a predetermined pressure.
A fuel injection device for an internal combustion engine according to any one of claims 2 to 5,
The plunger-type pump unit includes a diaphragm-type pump unit that assists the suction of the plunger-type pump unit.