JP5720675B2 - Engine fuel injector - Google Patents

Description

  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 device for a motorcycle engine, when an injector is installed upright on an intake pipe, it is ideal to direct the fuel spray from the injector directly to the so-called umbrella of the intake valve. Further, in order to facilitate the manufacture of the intake pipe for erecting the injector, the injector is arranged vertically in a front view.

  The engine fuel injection device described in Patent Literature 1 includes an injector having a pair of injection holes for injecting fuel in two directions. One of the injection holes injects fuel toward an intake valve, and the other injection hole has an intake air. Injection is made toward the spark plug arrangement side portion of the port wall surface.

  In particular, in the case of a structure configured as a swing type power unit, when the injector is erected on the intake pipe in the arrangement structure of the injector, the arrangement of the fuel pipe and the injector power supply is taken into consideration for the engine swing. 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 protruding from the fuel joint are arranged in a triangle. This avoids interference with other components of the fuel injection valve and facilitates connection of the fuel supply pipe to the fuel joint portion.

Japanese 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, in the intake passage where the intake port and the intake valve are offset to the left and right, the injector standing on the intake pipe is arranged vertically in front view. Directing the fuel spray of the injector directly to the intake valve is substantially difficult. In addition, since the spray from the injector cannot be directed directly to the intake valve, the spray from the injector adheres to the wall surface in the intake port, and the atomized spray liquefies, which may affect fuel consumption and exhaust gas. .

  Further, when the piping and the wiring are arranged in the same direction or arranged at a different angle, the engine swing absorbing portions are likely to be close to each other, and in an extreme case, there is a fear of wear. Further, regarding the setting of the mounting boss of the injector, the sealing performance of the fitting portion between the injector and the fuel pipe has been regarded as important.

  In view of such circumstances, an object of the present invention is to provide a fuel injection device for an engine that can appropriately and effectively connect pipes and wirings and can efficiently and effectively inject fuel.

In the fuel injection device for an engine of the present invention , a swing type power unit is supported so as to be swingable in the vertical direction around the swing axis, the power unit includes an engine, and the cylinder axis of the engine is substantially horizontal along the vehicle longitudinal direction. The fuel injection valve is erected in a substantially vertical direction in a mounting hole provided in the intake pipe connected to the cylinder head of the engine , and the power coupler is protruded from the side of the main body of the fuel injection valve. A cap portion having a fuel pipe joint projecting from an end portion on the fuel introduction side of the fuel injection valve is provided, and the cap portion is coupled to a pair of mounting bosses formed to protrude on both front and rear sides of the mounting hole of the intake pipe. The fuel injection device is arranged such that a straight line connecting the pair of mounting bosses is substantially parallel to an axis of the intake pipe in a plan view, and connects the pair of mounting bosses. As a reference line, while to protrude the fuel pipe joint on the side, characterized in that is projected to the power coupler to the other side.

  In the fuel injection device for an engine according to the present invention, the fuel pipe joint and the power coupler are protruded along substantially the same straight line.

In the fuel injection device for an engine of the present invention, a central axis or a seal of the fuel injection valve is arranged on a straight line connecting the pair of mounting bosses.

In the fuel injection device for an engine according to the present invention, the intake port is inclined in front view, and the center axis of the fuel injection valve and the axis of the intake port are aligned in front view.

  According to the present invention, the fuel hose joint and the power supply coupler to which the fuel hose, harness, etc. are connected are led out in the substantially opposite direction with respect to the mounting boss, so that the fuel hose, harness piping and wiring interfere with each other. You can avoid it. These piping and wiring can be connected appropriately and easily. In addition, an injector standing on the intake pipe in an intake passage in which the intake port and the intake valve are offset to the left and right is inclined to either the left or right in front view, so that the fuel spray of the injector is directly injected into the intake valve. It becomes possible to improve fuel efficiency and exhaust gas performance.

FIG. 1 is a side view showing the overall configuration of a motorcycle according to the present invention. FIG. 2 is a perspective view showing a configuration example of a body frame of the 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 the motorcycle according to the present invention. FIG. 4 is a side view showing the periphery of the fuel injection device attached to the cylinder in the motorcycle according to the present invention. FIG. 5 is a perspective view showing the periphery of the mounting boss of the fuel injection device projecting from the intake pipe in the motorcycle according to the present invention. FIG. 6 is a front view showing the periphery of the fuel injection device attached to the cylinder in the motorcycle according to the present invention. 7 is a cross-sectional view taken along line AA in FIG. FIG. 8 is a cross-sectional view showing a state of fuel injection in the case of a fuel injection device attached substantially vertically to a cylinder of a motorcycle. FIG. 9 is a perspective view showing the periphery of the fuel injection device projecting from the intake pipe in the motorcycle according to the present invention. FIG. 10 is a plan view showing the periphery of the fuel injection device projecting from the intake pipe in the 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, preferred embodiments of a fuel injection device for an engine according to the present invention will be described with reference to 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 with reference to FIG. In the drawings used in the following description, including FIG. 1, the front of the vehicle is indicated by an arrow Fr, the rear of the vehicle is indicated by an arrow Rr, and the lateral right side of the vehicle is indicated by an arrow R as necessary. The left side is indicated by an arrow L.

  The vehicle 100 is configured by forming a vehicle body skeleton by a plurality of vehicle body frames made of steel or aluminum alloy and mounting various parts on the vehicle body frame. Note that FIG. 2 is also referred to as an example of the configuration of the body frame. The down tube 101 which is a part of the body frame has a front end coupled to the steering head pipe 102 and extends substantially downward from the steering head pipe 102, and is connected to the under frame 103 near the lower end portion thereof. The under frame 103 extends substantially rearward. A rear frame 104 composed of a pair of left and right as a part of the vehicle body frame is coupled to the rear side of the down tube 101, and each of them extends generally inclining rearward and upward.

  The steering head pipe 102 rotatably supports a front fork 105. A handle bar 106 is fixed to the upper end of the front fork 105, and a 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 the engine is attached to the rear end of the under frame 103, and the swing shaft 111 of the swing shaft 111 is connected via a stay 110 provided on the bracket 109. A swing type power unit 112 is supported so as to be swingable up and down. The power unit 112 is a unit that includes a cylinder assembly 113, a crankcase 114, and a transmission device 115 that includes a continuously variable transmission using a belt / pulley, and can swing on a stay 110 on the front side of the vehicle. The rear wheel 116 is rotatably supported by the transmission device 115 on the vehicle rear side. 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 transmission device 115 located on the vehicle rear side in the power unit 112. In front of the air cleaner 118, an intake hose 119, a throttle body 120 having an idle speed control (ISC) device 121, and an intake pipe (intake pipe) 122 are connected. The intake pipe 122 communicates with an intake port (intake port) in the cylinder head 113A of the cylinder assembly 113, and is purified from the air cleaner 118 to the intake port of the cylinder assembly 113 through an intake passage constituted by these members. Air is supplied. A fuel injection device 10 is erected on the intake pipe 122 so as to inject fuel toward the intake port. Although not shown, an exhaust port is formed on the lower surface side of the cylinder assembly 113. The exhaust port is bent rearward from the exhaust port and extends to the muffler at the rear of the vehicle.

  Further, as shown in FIG. 1, a seat 123 for a rider to sit on is installed above the power unit 112, and a step board 124 on which the rider seated on the seat 123 places his feet above the underframe 103, It is supported by the step frame 125 (see FIGS. 2 and 3). The step board 124 is formed integrally with a leg frame cover that constitutes the exterior 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 articles and the like opened and closed by the seat 123.

  As a vehicle exterior, various vehicle body covers are supported and attached to appropriate positions such as a vehicle body frame. The front leg shield 127 covers the front side of the vehicle and is mounted with a winker or the like, and is continuous with the above-described step board 124. The rear frame cover 128 covers the lower part of the seat 123 or the rear side of the vehicle, and a winker and a brake lamp are mounted. Upper portions of the front wheel 107 and the rear wheel 116 are covered with 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 device 115, and these are integrated. With the power unit 112 mounted on the vehicle 100, the cylinder assembly 113, the crankcase 114, and the transmission device 115 are arranged in this order from the vehicle front side. The cylinder assembly 113 includes a single-cylinder air-cooled engine, and is arranged so that the cylinder axis is substantially horizontal along the vehicle longitudinal direction.

  Various components are installed above the power unit 112. That is, an intake passage including an intake hose 119, a throttle body 120, and an intake pipe 122 is formed in front of the air cleaner 118, and the ISC device 121 and the fuel injection device 10 are disposed. As shown in FIG. 4, the throttle body 120 is connected to an intake pipe 122 in a substantially horizontal state, and the intake pipe 122 is disposed at a substantially central portion in the left-right direction of the cylinder with an appropriate gap above the cylinder head 113A. Further, the intake pipe 122 is connected to an intake port on the cylinder head 113A side in such a manner that the front side is bent downward as shown in the figure. In the cylinder assembly 113, the cylinder 113B and the cylinder head cover 113C are coupled so as to sandwich the cylinder head 113A.

  In the above case, the ISC device 121 is mounted on the throttle body 120 as shown in FIG. The ISC device 121 is configured to control the duty of the control valve by operating a solenoid to control the idle ring rotation speed. Since the solenoid of the ISC device 121 is energized and driven via the coupler 131, a lead wire (not shown) is connected to the coupler 131. A resonator 132 is connected to the ISC device 121 in the middle of the bypass passage of the throttle valve. Further, as will be described later, a control lead wire and a fuel supply hose are connected to the fuel injection device 10, and the ISC device 121 arranged in the close position in this way is surrounded around the fuel injection device 10. 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, an injector 11 is erected in a substantially vertical direction. The intake pipe 122 is provided with a mounting portion 12 for the injector 11, and a mounting hole 13 (FIG. 5) in which the end portion of the injector 11 is fitted and fixed is formed in the mounting portion 12. A pair of mounting bosses 14 are erected on both front and rear sides of the mounting hole 13 as shown in FIG. 5, and a cap 16 formed by projecting a fuel hose joint 15 on the upper end of these mounting bosses 14 is a bolt. 17 (see FIG. 6 etc.) for fastening. A fuel hose is connected to the fuel hose joint 15 so that fuel is supplied to the injector 11 via the fuel hose joint 15.

  A power coupler 18 protrudes from the side of the injector 11 (the left outer side in this example), and a harness (not shown) for supplying a control signal for controlling the drive of the injector 11 is connected to the power 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 the left and right opposite sides. This point will be described in more detail later.

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

  An intake valve 135 is disposed at the back of the intake port 133. Since the intake port 133 is inclined, the intake port 133 and the intake valve 135 form an intake passage that is offset in the left-right direction (FIG. 7, offset amount). B). Although offset in this way, 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). Accordingly, the fuel injected from the injection nozzle 11A is directed toward the center of the intake valve 135 and supplied to the back side of the umbrella of the intake valve 135 as shown by a dot (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 injector 11 itself has its central axis 11a not inclined in front view, That is, the case where it arrange | positions substantially vertical is assumed. In this case, as shown in FIG. 8, the fuel injected from the injection nozzle 11 </ b> A is not directed to the center of the intake valve 135 as it is, so that the amount attached to the wall surface of the intake port 133 increases. Become.

  Next, the 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 injector 11 is erected. A straight line C (see also FIG. 5) connecting these mounting bosses 14 is arranged so as to be 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, with reference to a straight line C connecting these mounting bosses 14, a fuel hose joint 15 protrudes on one side (right side) and a power source is on the other side (left side). The coupler 18 is protruded.

  In the above case, it is more preferable that the fuel hose joint 15 and the power supply coupler 18 protrude 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-right direction) orthogonal to the straight line C (substantially front-rear direction) in plan view. In the present embodiment, as shown by the dotted lines in FIG. 11, the fuel hose joint 15 and the power supply coupler 18 are disposed so as to be appropriately inclined forward.

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

  According to the fuel injection device 10 configured as described above, in the intake passage where the intake port 133 and the intake valve 135 are offset to the left and right, the injector 11 standing on the intake pipe 122 is inclined to either the left or the right when viewed from the front. As a result, the fuel spray from the injector 11 can be directly injected into the intake valve 135. As a result, the amount of spray adhering to the wall surface in the intake port 133 can be reduced, and the fuel efficiency and exhaust gas performance can be improved.

  Further, the injector 11 is mounted between the mounting bosses 14 arranged side by side in the front-rear direction on the intake pipe 122, the fuel hose joint 15 is disposed on one side of the straight line C connecting the mounting bosses 14 as described above, and the other side. The power supply coupler 18 is disposed in In this way, the fuel hose joint 15 and the power supply coupler 18 to which the fuel hose, harness and the like are connected are led out in substantially opposite directions, so that the piping and wiring of the fuel hose and harness can be prevented from interfering 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 protruded so as to be substantially the same straight line (straight line D) as shown in FIG. In addition, it is possible to avoid interference between the harnesses as much as possible.

Further, when the fuel hose or harness is inserted and connected to the fuel hose joint 15 or the power supply coupler 18, the insertion movement of the fuel hose and harness does not intersect, and the fuel hose piping can be set low. That is, as shown in FIG. 12, the direction H of the fuel hose with respect to the fuel hose joint 15 and the direction F of the harness with respect to the power supply coupler 18 are set on the opposite side as shown in the figure. Interference elements between harnesses can be reduced. If the fuel hose joint 15 and the power supply coupler 18 are arranged on the same side, for example, on the left side, and the fuel hose direction E ₁ or E ₂ , the harness direction F _{1 in} the case of the direction E _1. Will interfere. Further, if the handling direction E ₂ is set to avoid such interference, the influence on other peripheral components becomes large. By setting the fuel hose joint 15 and the power supply coupler 18 in the routing direction E and the routing direction F, the influence on the mutual interference and other parts is greatly reduced, and the piping of the fuel hose is set substantially low. Can do.

  Further, on the straight line C connecting the mounting bosses 14, as shown in FIG. 11, the central axis 11 a of the injector 11 or the central part of the seal structure is arranged. By disposing the seal structure for the injector 11 at the center, it is possible to exert an appropriate sealing function without deviation and improve the sealing performance of the injector 11 and the fuel hose.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the fuel hose joint 15 and the power supply coupler 18 may be disposed in a reverse relationship with respect to each other.
In addition, if only one of the pair of mounting bosses 14 arranged at the front and rear is provided and a necessary and sufficient support rigidity can be secured for the injector 11, a single mounting boss 14 may be provided.

  In the present invention, the piping and wiring of the fuel hose and harness can be prevented from interfering with each other, and these piping and wiring can be connected appropriately and easily. In addition, the injector standing on the intake pipe is tilted to the left or right when viewed from the front, so that fuel spray from the injector can be directly injected into the intake valve, improving fuel efficiency and exhaust gas performance. It has excellent advantages such as being possible.

Claims (4)

A swing type power unit is supported so as to be swingable up and down around a swing axis, the power unit includes an engine, and the cylinder axis of the engine is disposed so as to be substantially horizontal along the vehicle front-rear direction. A fuel injection valve is erected in a substantially vertical direction in a mounting hole provided in an intake pipe connected to the head, and a power coupler is projected from a side of the main body of the fuel injection valve, and a fuel introduction side end of the fuel injection valve A fuel injection device provided with a cap part projecting a fuel pipe joint, and a pair of attachment bosses formed to project the cap part on both front and rear sides of the attachment hole of the intake pipe,
The straight line connecting the pair of mounting bosses is arranged so as to be substantially parallel to the axis of the intake pipe in plan view, and the fuel pipe joint protrudes on one side of the straight line connecting the pair of mounting bosses. An engine fuel injection device characterized in that the power supply coupler protrudes on the other side.   2. The fuel injection device for an engine according to claim 1, wherein the fuel pipe joint and the power coupler are protruded along substantially the same straight line. The engine fuel injection device according to claim 2, wherein a central axis or a seal of the fuel injection valve is arranged on a straight line connecting the pair of mounting bosses. The engine fuel injection device according to claim 1, wherein the intake port is inclined in a front view, and a central axis of the fuel injection valve and an axis of the intake port are aligned in a front view.

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