WO2011129316A1

WO2011129316A1 - Fuel injection device for engine

Info

Publication number: WO2011129316A1
Application number: PCT/JP2011/059046
Authority: WO
Inventors: 剛吉村松; 康平濱澤
Original assignee: スズキ株式会社
Priority date: 2010-04-13
Filing date: 2011-04-12
Publication date: 2011-10-20
Also published as: JP5720675B2; JPWO2011129316A1; CN102844560B; CN102844560A

Abstract

A fuel injection valve (11) is raised from an air intake pipe (122), and an electric power source coupler (18) is provided so as to protrude from a side of the body of the fuel injection valve (11). A cap section (16) from which a fuel piping joint (15) protrudes is provided to a fuel introduction-side end section of the fuel injection valve (11). The cap section (16) is joined to a pair of mounting bosses (14) formed so as to protrude from the air intake pipe (122). The rectilinear line which connects the pair of mounting bosses (14) is set to be substantially parallel, in a plan view, to the axis of the air intake pipe (122). The fuel piping joint (15) is provided so as to protrude on one side relative to the rectilinear line which connects the pair of mounting bosses (14), and the electric power source coupler (18) is provided so as to protrude on the other side.

Description

Engine fuel injection system

The present invention relates to a fuel injection device for an engine mounted on a vehicle such as a motorcycle.

For example, in a fuel injection system of a motorcycle engine, when the injector is disposed upright on the intake pipe, it is ideal to direct the fuel spray from the injector directly to the so-called back of the intake valve. In addition, in order to facilitate the manufacture of the intake pipe in which the injector is erected, the injector is vertically disposed in a front view.

The fuel injection device of the engine described in Patent Document 1 includes an injector having a pair of injection ports for injecting fuel in two directions, one of the injection ports injects the fuel toward the intake valve, and the other injection port is the intake It is made to inject toward the spark plug arrangement | positioning side part in a port wall surface.

Furthermore, particularly in the case of being configured as a swing type power unit, in the arrangement structure of the injector, when the injector is erected on the intake pipe, the fuel piping and the wiring of the injector power source are taken into consideration for the swing of the engine. Must.

For example, in the fuel injection valve described in Patent Document 2, the axis of the pair of mounting bosses and the axis of the cap portion in which the fuel joint is provided in a protruding manner are arranged in a triangle. Thereby, interference with other parts of the fuel injection valve is avoided, and the connection of the fuel supply pipe to the fuel joint portion is facilitated.

Patent No. 2815242 JP, 2006-266132, A

Various arrangements have been made in the past regarding the arrangement of the fuel injection device. For example, particularly in the intake passage where the intake port and the intake valve are offset to the left and right, for example, the injector vertically installed in the intake pipe is vertically disposed. It is substantially difficult to direct the fuel spray of the injector directly to the intake valve. In addition, since the injector spray can not be directed directly to the intake valve, the injector spray adheres to the wall surface in the intake port, and the atomized spray liquefies, which may affect fuel efficiency and exhaust gas. .

In addition, when piping and wiring are arranged in the same direction or when arranged at different angles, they tend to be close to each other in the engine rocking absorption part, and in extreme cases, there is a fear of wear. In addition, regarding the setting of the mounting boss of the injector, the sealability of the fitting portion of the injector and the fuel pipe has been regarded as important.

An object of the present invention is to provide a fuel injection device of an engine capable of connecting the piping and the wiring properly and effectively, and injecting the fuel efficiently and effectively.

In the fuel injection system of the engine according to the present invention, a fuel injection valve is erected in a mounting hole provided in an intake pipe connected to a cylinder head of the engine, and a power supply coupler is protruded from the side of the main body of the fuel injection valve A fuel injection device comprising: a cap portion having a fuel pipe joint projecting from a fuel introduction side end portion of a fuel injection valve, wherein the cap portion is coupled to a pair of mounting bosses protruding from the intake pipe, The straight line connecting the pair of mounting bosses is arranged in a plan view so as to be substantially parallel to the axis of the intake pipe, and the fuel pipe joint is protruded on one side with reference to the straight line connecting the pair of mounting bosses It is characterized in that the power supply coupler is provided on the other side.

Further, in the fuel injection device of the engine according to the present invention, the fuel pipe joint and the power supply coupler are protruded along substantially the same straight line.

Further, in the fuel injection system of the engine according to the present invention, the central axis or the seal of the fuel injection system valve is disposed on a straight line connecting the pair of mounting bosses.

Further, in the fuel injection device of the engine according to the present invention, the intake port is inclined in a front view, and the central axis of the fuel injection valve is protruded in an inclining manner corresponding to the inclination of the intake port in a front view. It is characterized by

According to the present invention, the fuel hose joint to which the fuel hose and the harness are connected and the power supply coupler are drawn in substantially opposite directions with respect to the mounting boss, whereby the piping and the wiring of the fuel hose and the harness interfere with each other. You can not do it. It becomes possible to connect these piping and wiring appropriately and easily. In addition, the fuel spray of the injector is directly injected to the intake valve by providing the injector, which is erected on the intake pipe in the intake passage in which the intake port and the intake valve are offset to the left and right, in front view. It is possible to improve fuel efficiency and exhaust gas performance.

FIG. 1 is a side view showing an entire configuration of a motorcycle according to the present invention. FIG. 2 is a perspective view showing a configuration example of a vehicle body frame of a motorcycle according to the present invention. FIG. 3 is a side view showing a configuration example of a power unit mounted on a vehicle body frame in a motorcycle according to the present invention. FIG. 4 is a side view showing the periphery of a fuel injection device attached to a cylinder in a motorcycle according to the present invention. FIG. 5 is a perspective view showing the periphery of a mounting boss of a fuel injection device provided on an intake pipe in a motorcycle according to the present invention. FIG. 6 is a front view showing the periphery of a fuel injection device attached to a cylinder in a motorcycle according to the present invention. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a cross-sectional view showing how fuel injection is performed in the case of a fuel injection device mounted substantially vertically on a cylinder of a motorcycle. FIG. 9 is a perspective view showing the periphery of a fuel injection device provided on an intake pipe in a motorcycle according to the present invention. FIG. 10 is a plan view showing the periphery of a fuel injection device provided on an intake pipe in a motorcycle according to the present invention. FIG. 11 is a plan view schematically showing an arrangement relationship of a fuel hose joint, a power supply coupler and the like in the motorcycle according to the present invention. FIG. 12 is a front view showing an arrangement relationship of a fuel hose joint, a power supply coupler and the like in the motorcycle according to the present invention.

Hereinafter, a preferred embodiment of a fuel injection device for an engine according to the present invention will be described based on the drawings.
FIG. 1 is a side view of a motorcycle according to the present invention. First, the overall configuration of the motorcycle will be described using FIG. In the drawings used in the following description, including FIG. 1, the front of the vehicle is indicated by the arrow Fr and the rear of the vehicle is indicated by the arrow Rr, and the right side of the vehicle is indicated by the arrow R, as necessary. The left side of the side is indicated by the arrow L.

The vehicle 100 forms a vehicle body frame by a plurality of vehicle body frames made of steel or aluminum alloy, and is configured by fitting various parts to the vehicle body frame. Note that FIG. 2 is also appropriately referred to as a configuration example of the vehicle body frame. A down tube 101, which is a part of a vehicle body frame, has a front end coupled to the steering head pipe 102, extends substantially downward from the steering head pipe 102, and is connected to an under frame 103 near its lower end. The under frame 103 extends substantially rearward. A pair of left and right rear frames 104 are joined to a rear side of the down tube 101 as a part of a vehicle body frame, and each extends in a generally rearward and upward direction.

The steering head pipe 102 rotatably supports the front fork 105, the handlebar 106 is fixed to the upper end of the front fork 105, and the front wheel 107 is rotatably supported on the lower end side. The front wheel 107 is equipped with a brake disc 108 that rotates integrally therewith.

Further, referring also to FIG. 3, a bracket 109 for supporting a power unit including an engine is attached to the rear end of the under frame 103, and the swing shaft 111 is mounted via a stay 110 provided on the bracket 109. The swing-type power unit 112 is supported so as to be swingable in the vertical direction around it. Power unit 112 is a unitized transmission device 115 including a cylinder assembly 113, a crankcase 114, and a continuously variable transmission using a belt / pulley, and can be pivoted to the stay 110 on the front side of the vehicle. The rear wheel 116 is rotatably supported by the transmission 115 on the rear side of the vehicle. The axle side of the rear wheel 116 and the rear frame 104 are connected by a shock absorber 117, and the power unit 112 as a whole functions as a swing arm.

An air cleaner 118 is mounted on the upper surface side of the power transmission device 115 located on the vehicle rear side in the power unit 112. An intake hose 119, a throttle body 120 having an idle speed control (ISC) device 121, and an intake pipe (intake pipe) 122 are sequentially connected in front of the air cleaner 118. Intake pipe 122 communicates with an intake port (intake port) in cylinder head 113A of cylinder assembly 113, and is cleaned from air cleaner 118 to an intake port of cylinder assembly 113 through an intake passage formed by these members. Air is supplied. A fuel injection device 10 is provided upright on the intake pipe 122 so as to inject fuel toward the intake port. Although illustration is omitted, an exhaust port is formed on the lower surface side of the cylinder assembly 113, and it is curved backward from this to extend an exhaust pipe, and is connected to the muffler at the rear of the vehicle.

Further, as shown in FIG. 1, a seat 123 for seating a rider is installed above the power unit 112, and above the underframe 103 is a step board 124 on which a rider seated on the seat 123 places a foot. It is supported by the step frame 125 (see FIGS. 2 and 3). The step board 124 is integrally formed with the leg frame cover that constitutes the appearance of the vehicle. Further, between the power unit 112 and the seat 123, there is a luggage box 126 formed as a storage space for an article etc. which is opened and closed by the seat 123.

As the vehicle appearance, various vehicle body covers are supported and attached to appropriate places such as a vehicle body frame. The front leg shield 127 covers the front side of the vehicle and is provided with blinkers or the like, and integrally connected with the above-described step board 124. The rear frame cover 128 covers the lower side of the seat 123 or the rear side of the vehicle, and is provided with blinkers and brake lamps. The upper portions of the front wheel 107 and the rear wheel 116 are covered by a front fender 129 and a rear fender 130, respectively.

Here, as described above, the power unit 112 includes the cylinder assembly 113, the crankcase 114, and the transmission 115, and these are integrated. When the power unit 112 is mounted on the vehicle 100, the cylinder assembly 113, the crankcase 114, and the transmission 115 are arranged in this order from the front side of the vehicle. The cylinder assembly 113 includes a single-cylinder air-cooled engine, and is disposed such that the cylinder axis is substantially horizontal along the longitudinal direction of the vehicle.

Then, various components are installed on the upper side of the power unit 112. That is, toward the front of the air cleaner 118, an intake passage including the intake hose 119, the throttle body 120, and the intake pipe 122 is configured, and the ISC device 121 and the fuel injection device 10 are disposed. The throttle body 120 is connected to the intake pipe 122 in a substantially horizontal state as shown in FIG. 4, and the intake pipe 122 is disposed substantially at the center in the lateral direction of the cylinder with an appropriate gap above the cylinder head 113A. Further, intake pipe 122 is connected to the intake port on the side of cylinder head 113A in a manner such that the front side is curved downward as shown. In the cylinder assembly 113, the cylinder 113B and the cylinder head cover 113C are coupled to sandwich the cylinder head 113A.

In the above case, the ISC device 121 is mounted on the top of the throttle body 120 as shown in FIG. The ISC device 121 duty-controls the control valve by the operation of the solenoid to control the idle ring rotation speed. Since the solenoid of the ISC apparatus 121 is energized and driven via the coupler 131, a lead wire (not shown) is connected to the coupler 131. In addition, a resonator 132 is connected to the ISC device 121 in the middle of the bypass passage of the throttle valve. Further, as described later, a lead wire for control and a fuel supply hose are connected to the fuel injection device 10, and around the fuel injection device 10 including the ISC device 121 disposed in such a close position. A large number of hoses and lead wires or harnesses are connected and routed.

In the fuel injection device 10 of the present invention, first, as shown in FIG. 4, the injectors 11 are erected substantially in the vertical direction. A mounting portion 12 of the injector 11 is provided on the intake pipe 122, and a mounting hole 13 (FIG. 5) is formed in the mounting portion 12 so that the end of the injector 11 is fitted and fixed. As shown in FIG. 5, a pair of mounting bosses 14 are erected on both sides of the mounting hole 13 as shown in FIG. 5, and a cap 16 formed by projecting the fuel hose joint 15 is bolted to the upper end of these mounting bosses 14. It is fixed by fastening (see FIG. 6 etc.) 17. A fuel hose is connected to the fuel hose joint 15, and fuel is supplied to the injector 11 through the fuel hose joint 15.

A power supply coupler 18 projects from a side portion (left outer side in this example) of the injector 11, and a harness (not shown) for giving a control signal for driving and controlling the injector 11 is connected to the power supply coupler 18 . In the present embodiment, the fuel hose joint 15 extends to the right as shown in FIG. 6, that is, the fuel hose joint 15 and the power supply coupler 18 are disposed on opposite sides to each other. This point will be described in more detail later.

In the present invention, as shown in FIG. 6, the central axis 11a of the injector 11 is further inclined in a front view, and has an inclination angle θ on the right side in this embodiment. The pair of mounting bosses 14 are also inclined at the same inclination angle θ. In this case, as shown in FIG. 7, intake port 133 of cylinder head 113A is also inclined to the right (inclination angle θ), and central axis 11a of injector 11 and the axis line of intake port 133 are substantially in a front view Aligned. An insulator 134 is interposed between (the mounting flange 122 a of) the intake pipe 122 and the intake port 133.

The intake valve 135 is disposed at the back of the intake port 133. However, since the intake port 133 is inclined, the intake port 133 and the intake valve 135 form an intake passage offset in the lateral direction (FIG. 7, offset amount) B). Although the offset is made in this manner, the injector 11 itself is also inclined at the same angle, so that the intake valve 135 is disposed on the axis of the injection nozzle 11A (the central axis 11a of the injector 11). Therefore, the fuel injected from the injection nozzle 11A is supplied to the umbrella backside of the intake valve 135 toward the central portion of the intake valve 135 as shown by a dot pattern in FIG.

Here, as shown in FIG. 8, the intake port 133 and the intake valve 135 which are inclined form an intake passage offset in the left-right direction, and the central axis 11a of the injector 11 itself is not inclined in a front view. That is, the case where it arrange | positions substantially vertically is assumed. In this case, as shown in FIG. 8, the fuel injected from the injection nozzle 11A does not point to the central portion of the intake valve 135 as it is, so the amount of the fuel adhering to the wall surface of the intake port 133 increases. Become.

Next, features of the fuel injection device 10 of the present invention will be further described. First, in the intake pipe 122, a pair of mounting bosses 14 for mounting the injectors 11 are erected. A straight line C (see also FIG. 5) connecting these mounting bosses 14 is arranged substantially parallel to the axis of the intake pipe 122 in a plan view as shown in FIG. Further, as shown in FIGS. 9 and 10, the fuel hose joint 15 is protruded on one side (right side) on the basis of a straight line C connecting the mounting bosses 14 to each other, and the power supply is provided on the other side (left side). The coupler 18 is protruded.

Further, in the above case, it is more preferable to project the fuel hose joint 15 and the power supply coupler 18 so as to be substantially in the same straight line. As schematically shown in FIG. 11, ideally, the fuel hose joint 15 and the power supply coupler 18 are extended along a straight line D (left and right direction) orthogonal to the straight line C (substantially front and back direction) in plan view. In the present embodiment, as shown by the dotted line in FIG. 11, the fuel hose joint 15 and the power supply coupler 18 are each appropriately inclined to the front side.

Further, as shown in FIG. 11, the central axis 11a of the injector 11 or the central portion of the seal structure is disposed on a straight line C (see FIG. 9, FIG. 10, etc.) connecting the pair of mounting bosses 14. Here, the seal structure means a structure in which when the injector 11 is inserted into and fixed to the mounting hole 13 of the mounting portion 12, a sealing means such as an O-ring 19 is interposed therebetween for sealing.

According to the fuel injection device 10 configured as described above, first, in the intake passage where the intake port 133 and the intake valve 135 are offset to the left and right, the injector 11 erected on the intake pipe 122 is provided inclined to either the left or the right in front view As a result, it is possible to inject the fuel spray from the injector 11 directly to the intake valve 135. This makes it possible to reduce the amount of adhesion of the spray to the wall surface in the intake port 133 and to improve the fuel consumption performance and the exhaust gas performance.

In addition, the injectors 11 are attached between the mounting bosses 14 arranged in the front and rear direction on the intake pipe 122, and the fuel hose joint 15 is connected to one side of the straight line C connecting the mounting bosses 14 as described above. And the power supply coupler 18 is disposed. As described above, the fuel hose joint 15 to which the fuel hose, the harness, and the like are connected and the power supply coupler 18 are drawn in substantially opposite directions, so that the piping and the wiring of the fuel hose and the harness do not interfere with each other.

In this case, the fuel hose joint 15 and the power supply coupler 18 are not simply led out in opposite directions, but preferably the fuel hose is projected so as to be substantially colinear (straight line D) as shown in FIG. And interference between the harnesses can be avoided as much as possible.

In addition, when the fuel hose and the harness are connected by being inserted into the fuel hose joint 15 or the power supply coupler 18, the insertion movement of the fuel hose and the harness does not intersect, and the fuel hose piping can be set low. That is, as shown in FIG. 12, the fuel hose connection direction E of the fuel hose with respect to the fuel hose joint 15 and the wiring direction F of the harness with respect to the power supply coupler 18 are set oppositely as shown. Interference elements between the harnesses can be reduced. If placing the fuel hose joint 15 and a power coupler 18 the same side, for example to the left, when the routing direction E ₁ or E ₂ of the fuel hose, handling direction F of the harness in the case of routing direction E ₁ It interferes with In addition, if the routing direction E ₂ is set to avoid such interference, the influence on other peripheral parts becomes large. By setting the fuel hose joint 15 and the power supply coupler 18 in the arrangement direction E and the arrangement direction F, mutual interference and effects on other parts are significantly reduced, and the fuel hose piping is set substantially low. Can.

Further, on the straight line C connecting the mounting bosses 14, as shown in FIG. 11, the central axis 11a of the injector 11 or the central portion of the seal structure is disposed. By arranging the seal structure for the injector 11 at its center, it is possible to exhibit a proper seal function without bias and to improve the sealability between the injector 11 and the fuel hose.

As mentioned above, although the present invention was explained with various embodiments, the present invention is not limited only to these embodiments, and can be changed within the scope of the present invention.
For example, the arrangement relationship between the fuel hose joint 15 and the power supply coupler 18 may be arranged in the reverse relationship.
In addition, if only one of the pair of mounting bosses 14 arranged in the front and rear direction can be used and the necessary and sufficient supporting rigidity can be secured for the injector 11, a single mounting boss 14 can be provided.

In the present invention, the piping and wiring of the fuel hose and the harness can be prevented from interfering with each other, and these piping and wiring can be connected properly and easily. In addition, by providing the injector standing upright on the intake pipe obliquely to one of the left and right in a front view, it is possible to inject the fuel spray of the injector directly to the intake valve, thereby improving the fuel efficiency and exhaust gas performance. It has the excellent advantages of being able to

Claims

A fuel injection valve is erected in a mounting hole provided in an intake pipe connected to a cylinder head of an engine, and a power supply coupler is protruded from the side of the main body of the fuel injection valve and at the fuel introduction side end of the fuel injection valve. A fuel injection device comprising a cap portion provided with a fuel pipe joint in a protruding manner, and the cap portion coupled to a pair of mounting bosses protruding from the intake pipe,
The straight line connecting the pair of mounting bosses is arranged in a plan view so as to be substantially parallel to the axis of the intake pipe, and the fuel pipe joint is protruded on one side with reference to the straight line connecting the pair of mounting bosses An engine fuel injection device characterized in that the power supply coupler is provided on the other side.
The fuel injection system for an engine according to claim 1, wherein the fuel pipe joint and the power supply coupler project along substantially the same straight line.
The fuel injection device of the engine according to claim 2, wherein a central axis or a seal of the fuel injection device valve is disposed on a straight line connecting the pair of mounting bosses.
2. The engine according to claim 1, wherein an intake port is inclined in a front view, and a central axis of the fuel injection valve is projected in an inclined manner corresponding to the inclination of the intake port in a front view. Fuel injection device.