JP4390218B2 - Engine fuel injection device for motorcycles - Google Patents

Description

The present invention relates to a technique for improving a fuel injection device for an engine for a motorcycle .

2. Description of the Related Art Engine fuel injection devices are known for motorcycles (see, for example, Patent Document 1).
JP 2000-97132 A (page 2-3, FIG. 1 to FIG. 2)

  According to Patent Document 1, the conventional fuel injection device for an engine is provided with an air chamber at the upstream end of the intake passage of the engine, and this air chamber is formed as a two-divided chamber of a lower chamber and an upper chamber, and at the upstream end of the intake passage. A fuel injection valve for injecting fuel toward the inside is provided in the air chamber.

  However, since the conventional fuel injection device for an engine is provided with a fuel injection valve in the air chamber, it is difficult to improve the maintenance and inspection workability of the fuel injection valve, and the fuel piping and wiring to the fuel injection valve are difficult. It is difficult to improve the connection workability, and there is room for improvement.

Accordingly, an object of the present invention is to provide a technique for maintenance and inspection of the fuel injection valve enhanced capable and Turkey.

In order to achieve the above object, according to a first aspect of the present invention, an air chamber is provided at an upstream end of an intake passage of an engine, and a wall facing the wall connected to the upstream end of the intake passage among the walls constituting the air chamber is provided. This is a fuel injection device for an engine for a motorcycle in which a fuel injection valve for injecting fuel toward the upstream end of the intake passage is connected to a fuel pipe and wiring outside the air chamber. The fuel tank connected to the fuel pipe is disposed behind the air chamber, and the upper surface of the fuel tank is disposed higher than the upper surface of the air chamber. Also serving as an air cleaner case having an element, the filter element is disposed on the front side of the fuel injection valve, and the upper wall formed on the front side is the fuel injection case. Is disposed so high than the upper wall which is fitted a valve, the fuel tank is provided with an extension portion formed by extending forward while the upper portion of the front wall is bent to the lower side concave fuel tank, wherein A first header pipe for supplying the fuel is connected to the fuel injection valve, and is disposed below the extension, and the fuel injection valve is not provided among the walls constituting the air chamber. An inspection port is provided on the wall surface, the inspection port is closed with a removable lid, and a lid constituting the upper wall of the air chamber is disposed at the front of the air chamber, and a fuel is disposed at the rear of the upper wall of the air chamber. The injection valve and the first header pipe are fixed, and the fuel injection valve and the first header pipe are surrounded by the rear surface of the upper wall on the front side of the air chamber and the bottom surface of the extension portion of the fuel tank. Characterized in that the placed.
A second aspect of the present invention is characterized in that, in the first aspect, the rear portion of the upper wall of the air chamber to which the fuel injection valve and the first header pipe are fixed is configured as a non-detachable wall portion. Item 2. A fuel injection device for an engine for a motorcycle according to Item 1.

A third aspect is characterized in that, in the first aspect, a removable cover is provided to cover the air chamber exposed from the fuel tank.

A fourth aspect of the present invention is characterized in that, in the second aspect, the cover is formed so as to cover at least a part of the upper half of the fuel tank from the upper half of the air chamber.

A fifth aspect is characterized in that, in the second or third aspect, the cover is detachably fixed to the body frame .

In the sixth aspect of the invention, the engine includes a plurality of cylinders arranged in series, the fuel injection valve is arranged along the cylinder arrangement direction for each cylinder, and the first header pipe is arranged along the cylinder arrangement direction. In addition to the fuel injection valve provided in the air chamber connected to the fuel injection valve, the intake passage side fuel injection valve is provided in the intake passage, and the intake passage side fuel injection valve is arranged in the cylinder arrangement direction. And a fuel pipe connected between the first header pipe and the second header pipe and arranged between the fuel tank and the air chamber. It is provided and the arrangement space of fuel piping is formed so that the back wall of an air chamber may be dented.

According to a seventh aspect of the present invention, the engine includes a cam chain at an end portion in the cylinder arrangement direction, and the fuel pipe is disposed at the cam chain side end portion of the first header pipe, and an arrangement space formed in the air chamber is provided. The fuel pipe is exposed at the cam chain side end portion side.

The eighth aspect of the present invention is characterized in that the extension portion of the fuel tank is formed so as not to cover the upper part of the inspection port.

The fuel injection valve provided in the air chamber is a fuel injection valve for high-speed operation of the engine, and the intake passage side fuel injection valve is a fuel injection valve for low-speed operation of the engine. .

According to a tenth aspect of the present invention, an electrical component for controlling the fuel injection valve in the vicinity of the fuel injection valve is attached to a wall constituting the air chamber.
According to the eleventh aspect, the air chamber is made of resin, and an attachment member separate from the resin air chamber is interposed between the upper wall of the resin air chamber and the fuel injection valve. The fuel pipe is fastened to the mounting member so as to sandwich the fuel injection valve.

According to the first aspect of the present invention, an air chamber is provided at the upstream end of the intake passage of the engine, and a wall facing the wall connected to the upstream end of the intake passage is directed toward the upstream end of the intake passage among the walls constituting the air chamber. By providing the fuel injection valve for injecting fuel, the fuel injection valve can be attached to and detached from the outside of the air chamber, so that it is not necessary to disassemble the air chamber during maintenance and inspection of the fuel injection valve. For this reason, maintenance / inspection workability can be improved. Furthermore, even in an air chamber with a limited capacity, such as that mounted on a motorcycle, a fuel injection valve can be provided at a position away from the intake passage.
The fuel tank also includes an extension formed by extending forward only while curving only the upper part of the front wall of the fuel tank into a lower concave shape, and is connected to a first header pipe that supplies fuel to the fuel injection valve. And disposed below the extension.
In addition, an inspection port is provided on the wall of the air chamber where the fuel injection valve is not provided, and the inspection port is closed with a removable lid, so that the filter element can be maintained and removed simply by removing the lid. Since inspection work can be performed, workability can be improved.
According to the present invention, the lid constituting the upper wall of the air chamber is arranged at the front part of the air chamber, and the rear part of the upper wall of the air chamber is constituted by a non-detachable wall part. The fuel injection valve and the first header pipe are fixed to each other, and the extension portion of the fuel tank covers the upper portion of only the portion of the upper wall of the air chamber where the fuel injection valve and the first header pipe are provided. did.
In a second aspect of the present invention, the rear portion of the upper wall of the air chamber to which the fuel injection valve and the first header pipe are fixed is configured as a non-detachable wall portion.

According to a third aspect of the present invention, the detachable cover for covering the air chamber exposed from the fuel tank is provided.

According to a fourth aspect of the present invention, in the third aspect, the cover is formed so as to cover at least part of the upper half of the fuel tank from the upper half of the air chamber.

A fifth aspect of the present invention is the method according to the third or fourth aspect, wherein the cover is detachably fixed to the vehicle body frame.

According to a sixth aspect of the present invention, the first header pipe is disposed along the cylinder arrangement direction, and is connected to a fuel injection valve provided in the air chamber to supply fuel. The fuel pipe is connected to the header pipe, the fuel pipe connects the first header pipe and the second header pipe, and is disposed between the fuel tank and the air chamber so that the rear wall of the air chamber is recessed. Since the piping arrangement space is formed, the fuel piping connects the first header pipe and the second header pipe, and is arranged between the fuel tank and the air chamber.

According to a seventh aspect of the present invention, the engine includes a cam chain at an end portion in the cylinder arrangement direction, and the fuel pipe is disposed at the cam chain side end portion of the first header pipe, and an arrangement space formed in the air chamber is provided. Since the fuel pipe is exposed on the cam chain side end portion side, the fuel pipe can be arranged using the space formed on the cam chain side.

Claim 8 is formed so that the extension of the fuel tank does not cover the inspection port.

According to a ninth aspect of the present invention, the fuel injection valve provided in the air chamber is a fuel injection valve for high speed operation of the engine, and the intake passage side fuel injection valve is a fuel injection valve for low speed operation of the engine. As a result, when the rotation of the engine is low, fuel can be supplied from the low-speed operation fuel injection valve to the intake passage close to the combustion chamber, and the responsiveness of the supply amount can be improved.

According to the tenth aspect of the present invention, since the electrical component for controlling the fuel injection valve is attached to the wall constituting the air chamber in the vicinity of the fuel injection valve, the electrical component for controlling the fuel injection valve can be easily installed near the fuel injection valve. Since it can be provided, the wiring from the electrical component to the fuel injection valve can be shortened. For this reason, the weight of the motorcycle can be reduced and the cost can be reduced.
According to the eleventh aspect, an attachment member separate from the resin air chamber is interposed between the upper wall of the resin air chamber and the fuel injection valve, and the attachment members are integrally formed by connecting a plurality of attachment members. Since the piping is fastened to the mounting member so as to sandwich the fuel injection valve, the mounting accuracy can be increased, the weight of the resin air chamber can be reduced, and the mounting rigidity can be increased.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, “right”, “upper”, and “lower” follow the direction seen from the driver. The drawings are to be viewed in the direction of the reference numerals.

  FIG. 1 is a left side view of a motorcycle according to the present invention. The motorcycle 10 includes a cradle-type body frame 20, a front fork 31 attached to a head pipe 21 of the body frame 20, a front wheel 32 attached to the front fork 31, a handle 33 connected to the front fork 31, a body frame. 20, a fuel tank 34 and an air chamber 35 attached to the upper part of the vehicle 20, a seat rail 40 extending rearward from the vehicle body frame 20, a front seat 51 and a rear seat 52 attached to the seat rail 40, and a cradle of the vehicle body frame 20. A four-cycle engine 53 disposed in the space, a silencer 55 connected to an exhaust port of the engine 53 via an exhaust pipe 54, and a swing arm 56 suspended by a rear cushion (not shown) at the rear of the body frame 20; And a rear wheel 57 attached to the swing arm 56. And forming member is a full cowling type vehicle covered with a cowl 58 that indicates the vehicle body 11 by imaginary lines.

  The vehicle body 11 includes a vehicle body frame 20 and a seat rail 40. The seat rail 40 is a rear frame that supports the seats (front and rear seats 51 and 52). A driver can sit on the front seat 51, and a passenger can sit on the rear seat 52.

  The exhaust pipe 54 extends from the exhaust port provided at the front of the engine 53 to the rear of the vehicle body frame 20 through the lower part of the engine 53, extends upward from the rear end along the vehicle body frame 20, and the seat rail 40 from its upper end. A metal tube extending to the silencer 55 along the line. Reference numeral 61 denotes a heat shield tube that covers the exhaust pipe 54, 62 denotes a heat shield plate that covers the upper portion of the silencer 55, and 67 denotes a protector that covers the left and right rear portions of the silencer 55. The protector 67 is a protection plate attached to the stay 81 for attaching the rear fender 82.

  As described above, the motorcycle 10 has the front wheel 32, the engine 53, and the rear wheel 57 arranged in this order from the front to the rear of the vehicle body 11, the exhaust pipe 54 is extended rearward from the engine 53, and the muffler is silenced at the rear end of the exhaust pipe 54. The silencer 55 is disposed between the left and right seat rails of the seat rail 40 and above the rear wheel 57 at the rear portion of the body frame 20.

  In the figure, 63 is a front fender, 64 is a radiator, 65 is a stand, 72 is a battery, 74 is a key cylinder, 82 is a rear fender, 84 is a number plate, 85 is a license plate lamp, 86 is a winker, 87 is a tail lamp.

2 is a left side view of the vehicle body according to the present invention, and FIG. 3 is a plan view of the vehicle body according to the present invention. 2 and 3, the vehicle body frame 20 includes a head pipe 21, left and right main frames 22, 22 extending rearward from the head pipe 21, and left and right main frames 22, 22 extending downward from rear ends of the main frames 22, 22. Center frames 23, 23 (only the left is shown in this figure; the same applies hereinafter), left and right down frames 24, 24 extending from the front of the head pipe 21 and the main frames 22, 22 to the rear lower side, The left and right upper frames 25, 25 extending from the lower end of 24 to the rear of the main frames 22, 22, and a plurality of cross members (not shown).
Some or all of these frame components are cast products.

  The down frames 24, 24 have left and right through holes 24a, 24a penetrating inside and outside at the front. These through holes 24a and 24a can pass through intake pipes 66 and 66 indicated by imaginary lines. The intake pipes 66 and 66 are pipes that connect the intake ports 35 a and 35 a of the air chamber 35 to the air intake ports 58 a and 58 a at the front part of the cowl 58. Alternatively, the through holes 24 a and 24 a can be used as a part of the intake pipes 66 and 66.

  By the way, the vehicle body frame 20 is obtained by extending left and right brackets 26 and 26 upward from rear upper portions of the left and right main frames 22 and 22. The left and right brackets 26 and 26 are support members in which fuel tank support portions 27 and 27 are formed in the front portion and seat rail attachment portions 28 and 28 are formed in the rear portion. The seat rail 40 can be extended from the rear upper part of the body frame 20 to the rear by attaching the seat rail 40 to the seat rail attaching portions 28, 28 with bolts 29 (... indicates a plurality, the same applies hereinafter). The fuel tank support portions 27, 27 are through holes penetrating in the vehicle width direction.

4 is a plan view of the seat rail according to the present invention, and FIG. 5 is an exploded view of the seat rail according to the present invention.
The seat rail 40 includes a left seat rail 40L and a right seat rail 40R that are divided at the center CL in the vehicle width direction, and three cross members between the left and right seat rails 40L and 40R, that is, the front upper part in order from the front to the rear. A cross member 47, a front lower cross member 48, and a rear cross member 49 are stretched over.

  The left and right seat rails 40L and 40R are cast products divided into left and right parts having substantially flat upper and lower surfaces. That is, the left and right seat rails 40L and 40R can be formed by split molds that can be divided in the vehicle width direction at the time of molding, so that the surfaces in the vehicle width direction (upper and lower surfaces) are substantially horizontal flat surfaces. It is a thing.

Such left and right seat rails 40L and 40R include a rail mounting portion 41 at the front end (left side in the figure), fuel tank support portions 42 and 42 formed at the rear of the rail mounting portion 41, and a fuel tank support portion. 42 and 42, the front upper connection parts 43 and 43 and the front lower connection parts 44 and 44 formed at the rear, the rear connection parts 45 and 45 formed at the rear of the front lower connection parts 44 and 44, and the rear end (see FIG. Extension portions 46, 46 extending from the right side) toward the center CL in the vehicle width direction, and flanges 46a, 46a for aligning the tips thereof with each other are integrally provided.
The fuel tank support portions 42 and 42 are through holes penetrating in the vehicle width direction.

  (1) The front upper cross member 47 is overlapped between the front upper connection parts 43, 43 from above and assembled with fastening members B1, such as bolts. (2) The front lower cross member is interposed between the front lower connection parts 44, 44. 48, with bolts and other fastening members B2 sandwiched at both ends, and (3) a rear cross member 49 stacked on the rear connecting portions 45, 45 from above and assembled with bolts or other fastening members B3, 4) The left and right seat rails 40L, 40R can be combined by assembling the flanges 46a, 46a together with the fastening members B4 such as bolts.

  As described above, the seat rail 40 is a cast product having a substantially flat upper surface, and includes at least one cross member 47 to 49. The cross members 47 to 49 are tightened by fastening members B1 to B4 such as bolts. Can be installed later.

  Incidentally, as shown in FIG. 5, a hook plate 68 (sheet attachment member 68) made of a plate material can be attached to the extension portions 46 and 46 later by fastening members B5 and B5 such as bolts. The hook plate 68 is a member for attaching the rear portion of the rear seat 52 (see FIG. 1).

  FIG. 6 is a left side view around the engine, the fuel tank, and the air chamber according to the present invention. An air chamber 35 is disposed immediately above the engine 53, and there is a slight gap Di immediately behind the air chamber 35. It is shown that the fuel tank 34 is arranged.

  In the fuel tank 34, the front wall 91 and the bottom plate 92 are substantially flat, the upper plate 93 is provided with a fuel filler port 94, the bottom is provided with a fuel pump 95, and the left and right side plates 96, 96 are mounted with mount portions (first and first). 2), 3rd, 4th mounts 110A to 110D).

As is apparent from this figure, the upper surface 34a of the fuel tank 34 is slightly high than the upper surface 35b of the air chamber 35. Only the upper portion of the front wall 91 is bent in a lower concave shape and extends slightly forward so that the extension 97 covers only the rear upper portion of the air chamber 35. The upper half of the fuel tank 34 and the upper half of the air chamber 35, that is, the portion protruding upward from the vehicle body frame 20 are covered with a cover 98. The cover 98 is detachably attached to the vehicle body frame 20.

Incidentally, the engine 53 is a four-cylinder engine, and includes a fuel injection device 100 and a cam chain 53c at an end portion 53b (see FIG. 8) in the cylinder arrangement direction (X-axis direction in FIG. 8) .
The end 53b is a right end facing the left end 53d in the cylinder arrangement direction of the engine 53 (X-axis direction in FIG. 8).
In this figure, intake passages 101 are connected to the intake ports 53a (aligned in the front and back direction in this figure) for each cylinder, and throttle valves 102 are provided in the intake passages 101, respectively. It shows that the air chamber 35 is provided at the upstream end of the intake passage 101.

The fuel injection device 100 is provided with a first fuel injection valve 103 for each cylinder in the air chamber 35 on the upstream side of the throttle valve 102... And on the downstream side of the throttle valve 102 in the intake passage 101. The second fuel injection valves 104, which are intake passage side fuel injection valves, are provided for each cylinder. In this way, the first fuel injection valves 103 are provided upstream of the intake passages 101 of the engine 53, and the second fuel injection valves 104 are provided downstream of the intake passages 101.

The first fuel injection valves 103 are arranged higher than the second fuel injection valves 104, that is, the second fuel injection valves 104 are arranged lower than the first fuel injection valves 103.
Only the second fuel injection valves 104 are used during the low output operation of the engine 53, and the first fuel injection valve 103 and the second fuel injection valve 104 are used in combination during the high and low output operation. Can be increased.

That is, the second fuel injection valves 104 provided in the intake passage 101 are so-called fuel injection valves for low-speed operation of the engine 53 that inject fuel when the rotational speed of the engine 53 is low.
The first fuel injection valves 103 provided in the air chamber 35 are so-called fuel injection valves for high-speed operation of the engine 53 that inject fuel when the engine 53 has a high rotational speed.
When the rotation of the engine 53 is low, the fuel is supplied from the second fuel injection valves 104 to the intake passage 101 close to the combustion chamber of the engine 53, so that the responsiveness of the supply amount is improved.

  The fuel pump 95 is provided with a discharge port 95a at the lower end, and the first fuel injection valve 103 is connected to the discharge port 95a through a first fuel supply pipe 105, and the first fuel injection valve 103 is connected to the first fuel injection valve 103. The second fuel injection pipes 104 can be connected by the second fuel supply pipe 106. The fuel in the fuel tank 34 can be supplied to the first and second fuel injection valves 103... 104 by the fuel pump 95.

  Further, the first and second fuel supply pipes 105 and 106 are made of, for example, a hose and can be passed through a gap Di between the front wall 91 of the fuel tank 34 and the rear portion of the air chamber 35.

The cam chain 53c has an existing configuration and is used to drive an OHC or DOHC valve.
The engine 53 includes a plurality of cylinders arranged in series (front and back directions in FIG. 6), and the fuel injection valves (first fuel injection valve 103 and second fuel injection valve 104) are arranged in the cylinder arrangement direction for each cylinder (FIG. 8). In the X-axis direction).

FIG. 7 is a cross-sectional view of the fuel injection device according to the present invention as viewed from the left side, and shows a cross-sectional structure of the air chamber 35 in the fuel injection device 100. FIG. 8 is a plan view of the fuel injection device according to the present invention.
The air chamber 35 is a resin molded product divided into upper and lower parts composed of a lower chamber 130 in the lower half and an upper chamber 140 in the upper half, and is a container fixed up and down with screws 151.

The lower chamber 130 has a substantially horizontal lower wall 131 (bottom plate 131) connected to the upstream end of the intake passage 101 (only one is shown in the figure, the same applies hereinafter), and extends from the front end of the lower wall 131 to the front upper side. An open container comprising a front wall 132 (front plate 132), a rear wall 133 (rear plate 133) extending upward from the rear end of the lower wall 131, and left and right side walls 134, 134 (side plates 134, 134). It is.
The lower wall 131 includes a plurality of air supply pipes (funnels) 135 connected to the upstream ends of the plurality of intake passages 101, and the ends of the air supply pipes 135 are opened.

  The upper chamber 140 includes an upper wall 141 (top plate 141) facing the lower wall 131 and the front wall 132 of the lower chamber 130, a front wall 142 (front plate 142) extending downward from the front end of the upper wall 141, and an upper wall. 141 is a lower open container comprising a rear wall 143 (rear plate 143) extending downward from the rear end of 141, and left and right side walls 144, 144 (side plates 144, 144).

  In the rear wall 143 (rear plate 143), an arrangement space 143a of the fuel pipe (second fuel supply pipe 106) is formed so as to be recessed. The arrangement space 143a is formed by a recess 143b. The fuel pipe (second fuel supply pipe 106) is exposed on the right end 171b side (cam chain side end side) where the arrangement space 143a is the cam chain side end.

  It can be said that the upper wall 141 is a wall facing the lower wall 131 connected to the upstream end of the intake passage 101... Among the walls constituting the air chamber 35. The upper wall 141 is provided with a plurality of first fuel injection valves 103 for injecting fuel toward the upstream ends of the intake passages 101, that is, toward the openings 135a at the tips of the air supply pipes 135. It is a thing.

Specifically, the first fuel injection valves 103 are attached to the metal attachment members 152, and the gap between the attachment members 152 and the first fuel injection valves 103 is sealed with a waterproof rubber grommet (seal member). 153... Are assembled as an assembly unit, and mounting members 152... Are attached to the upper wall 141 by bolts, nuts 159. The first fuel injection valves 103 can be attached to the upper wall 141 via metal attachment members 152.
Since the first fuel injection valves 103 are attached to the air chamber 35 via metal attachment members 152, the attachment rigidity can be increased and the attachment accuracy can be increased.

  Thus, by providing the first fuel injection valves 103 for injecting fuel toward the upstream end of the intake passage 101, the fuel pipes shown in FIG. The (first and second fuel supply pipes 105 and 106) and the wiring 154 shown in FIG. 7 can be connected.

  Since the first fuel injection valves 103 can be attached to and detached from the air chamber 35 from the outside, it is not necessary to disassemble the air chamber 35 during maintenance and inspection of the first fuel injection valves 103. For this reason, maintenance / inspection workability can be improved. Furthermore, since the first and second fuel supply pipes 105 and 106 and the wiring 154 can be connected to the first fuel injection valves 103... Outside the air chamber 35, assembly workability and maintenance / inspection workability are improved. Can be increased.

  Furthermore, since the first and second fuel supply pipes 105 and 106 and the wiring 154 do not penetrate the wall of the air chamber 35, it is not necessary to provide a seal mechanism (airtight / watertight mechanism) at the penetrating portion. For this reason, the number of parts of the fuel injection device 100 can be reduced, and the configuration can be simplified.

In addition, since the first fuel injection valves 103 are not arranged in the air chamber 35, the capacity of the air chamber 35 can be easily secured and the flow resistance (air resistance) of the air flowing in the air chamber 35 is reduced. can do.
Furthermore, even in the air chamber 35 with a limited capacity, such as that mounted on the motorcycle 10 (see FIG. 6), the first fuel injection valves 103 can be provided at positions away from the intake passage 101.

By the way, the air chamber 35 also serves as an air cleaner case provided with a filter element 155. Since the air chamber 35 also serves as an air cleaner case, it is not necessary to provide a space for arranging the air cleaner case.
Specifically, as described with reference to FIGS. 2 and 3, the air chamber 35 includes intake ports 35 a and 35 a on the front left and right of the lower chamber 130.

  A rectangular and flat filter element 155 is disposed inside the air chamber 35, and a frame body 155a at the edge of the filter element 155 is detachably attached to the lower chamber. Specifically, the filter element 155 is arranged in parallel to the inclined front wall 132 of the lower chamber 130, the lower end portion of the frame body 155a is hung on the hooking portion 156 (set plate 156) of the lower chamber 130, and the frame body At least the upper end of 155a is fixed to the lower chamber 130 with screws 157.

  The filter element 155 can partition the internal space of the air chamber 35 into a primary side communicating with the intake ports 35a and 35a and a secondary side communicating with the air supply pipes 135. As a matter of course, the first fuel injection valves 103 and the air supply pipes 135 are arranged on the secondary side.

  In this way, the filter element 155 is inclined with respect to the mating surface 158 between the lower chamber 130 and the upper chamber 140 in the upstanding direction. Therefore, even when the dimension of the air chamber 35 in the front-rear direction is small, the filter element 155 can be configured to have a simple plate shape, the filter area can be maximized, and the secondary side The capacity of can be increased. The ratio of the secondary capacity to the primary capacity increases.

Further, the air chamber 35 is formed by opening a large inspection port 145 up to the vicinity of the first fuel injection valve 103 on the upper surface, that is, the upper wall 141 of the upper chamber 140, and closing the inspection port 145 with a lid 146 that can be removed. . The inspection port 145 can be arranged on the front side of the air chamber 35, and the first fuel injection valves 103 can be arranged on the rear side.
An upper plate 93 (see FIG. 6) of the fuel tank 34 is formed so as not to cover the upper part of the inspection port 145.

As described above, the wall constituting the air chamber 35 is inspected on the wall surface where the first fuel injection valves 103 are not provided (the portion of the upper wall 141 where the first fuel injection valves 103 are not provided). A mouth 145 can be provided.
Since the filter element 155 can be maintained and inspected simply by removing the lid 146, workability can be improved.

  Here, “the wall surface in which the first fuel injection valves 103... Are not provided among the walls constituting the air chamber 35” means that the first fuel injection valves 103 are provided in the walls constituting the air chamber 35. All parts that are not included are included. For example, as shown in FIG. 7, the upper wall 141 is provided with first fuel injection valves 103. However, the inspection port 145 can be provided in a portion of the upper wall 141 where the first fuel injection valves 103 are not provided.

Furthermore, an electrical component 161 for controlling the first and second fuel injection valves 103 and 104 is attached to a lid 146 serving as a wall constituting the air chamber 35 in the vicinity of the first fuel injection valve 103. The space above the air chamber 35 can be used effectively.
Specifically, a flat mounting portion 146a that is recessed on the outer surface of the lid 146 is formed, and the electrical component 161 is placed on the mounting portion 146a, and is removed by snap fitting (one-touch mounting) using an elastic nail or screwing. Installed as possible.

  The filter element 155 is disposed on the front wall 132 (front plate 132) formed on the front side 146b of the first and second fuel injection valves 103 and 104, and the upper wall 146c formed on the front side 146b is the first and second. 2 The fuel injection valves 103 and 104 are disposed higher than the upper wall 141 (top plate 141) into which the fuel injection valves 103 and 104 are fitted.
The upper wall 146 c includes a mounting portion 146 a for the lid 146.

Since the electrical components 161 for controlling the first and second fuel injection valves 103, 104,... Can be easily provided in the vicinity of the first fuel injection valves 103, the first and second fuel injections from the electrical component 161. The wiring 154 to the valves 103... 104 can be shortened. For this reason, the weight of the motorcycle 10 can be reduced and the cost can be reduced.
In the figure, reference numeral 162 denotes a driven portion of the throttle valve control device.

  FIG. 9 is an exploded view of the air chamber according to the present invention. The cover 98 can be removed upward from the body frame 20 by removing the screws 99. If the cover 98 is removed, the first fuel injection valve 103, the first and second fuel supply pipes 105 and 106 and the wiring 154 shown in FIGS. 7 and 8 are exposed, so that maintenance and inspection work can be performed. it can. In particular, since the plurality of first fuel injection valves 103 can be maintained and inspected from both sides of the vehicle body, workability is extremely good.

The maintenance / inspection work of the filter element 155 is performed as follows.
First, the cover 98 is removed, and then the lid 146 is removed.
Next, the screws 157... Holding the upper part of the filter element 155 are removed.
Next, the lower end portion of the filter element 155 is extracted from the hooking portion 156 by pulling the filter element 155 forward and upward.

As described above, since the filter element 155 can be maintained and inspected simply by removing the cover 98 and the lid 146 without disassembling the air chamber 35 or removing the first fuel injection valves 103, the workability is high. . Furthermore, since only the lower end portion of the air chamber 35 is hung on the hook portion 156, the attachment / detachment workability is good.
In order to store the filter element 155 again, a procedure reverse to the above procedure may be performed.

Next, fuel pipes (first and second fuel supply pipes 105 and 106) of the fuel injection device 100 will be described with reference to FIGS. 6, 8, 10, and 11. FIG.
FIG. 10 is a schematic view of the fuel injection device according to the present invention, and shows the fuel flow of the fuel injection device 100 as seen from the rear of the motorcycle 10. FIG. 11 is a rear view of the fuel injection device according to the present invention, as seen from the rear of the motorcycle 10, the air chamber 35, the first and second fuel injection valves 103, 104, and the first and second fuel supply pipes. 105 and 106 are shown.

10 and 11, fuel is returned from the fuel pump 95 to the second fuel injection valve 104 through the first fuel injection valve 103 through the first and second fuel supply pipes 105 and 106 to the fuel tank 34. It shows that it was connected like Specifically, the first header pipe 171 has a fuel outlet / inlet (an inlet joint 172 and an outlet joint 172) at both ends. On the other hand, the second header pipe 181 has only a fuel inlet (inlet joint 182).
As shown in FIG. 8, the first header pipe 171 is obtained by attaching attachment members 152... With bolts and nuts 175. Further, they are arranged along the cylinder arrangement direction (X-axis direction).

More specifically, the plurality of first fuel injection valves 103 are connected in a row to a first header pipe 171 formed of a straight pipe. The first header pipe 171 includes an inlet joint 172 at the left end (one end) 171a, and an outlet joint 173 at the right end (the other end) 171b that is the cam chain side end of the first header pipe 171. Prepare.
Similarly, a plurality of second fuel injection valves 104 are connected in a row to a second header pipe 181 made of a straight pipe. The second header pipe 181 includes an inlet joint 182 at the right end (one end) 181a.

The second header pipe 181 does not include an outlet joint like the first header pipe 171. That is, fuel does not exit from the left end (other end) 181b of the second header pipe 181.
The first and second header pipes 171 and 181 are also called delivery pipes or fuel pipes.

  An inlet joint 172 of the first header pipe 171 is connected to the discharge port 95 a of the fuel pump 95 through the first fuel supply pipe 105, and a second fuel supply pipe 106 is connected to the outlet joint 173 of the first header pipe 171. An inlet joint 182 of the header pipe 181 can be connected. That is, the first fuel supply pipe 105, the first header pipe 171 (first fuel injection valve 103 ...), the second fuel supply pipe 106, and the second header pipe 181 (second fuel injection valve 104 ...) are connected to the fuel pump 95. By continuously connecting in this order, the number of connected parts can be reduced and the number of parts can be reduced.

  The fuel supplied from the fuel tank 34 by the fuel pump 95 is the first fuel supply pipe 105 → the inlet joint 172 → the first header pipe 171 → the outlet joint 173 → the second fuel supply pipe 106 → the inlet joint 182 → the second header pipe. It flows along the route 181. Therefore, the fuel can be supplied to the first and second fuel injection valves 103, 104 through the first and second header pipes 171, 181.

  By the way, during the operation of the engine 53, the fuel is always injected from the second fuel injection valves 104. For this reason, even if some air is mixed in the fuel in the fuel pipe, the fuel is injected from the second fuel injection valves 104 at an early stage. Therefore, the amount of air accumulated in the high-order first header pipe 171 and the first fuel injection valves 103 is very small, and the engine 53 can maintain stable performance.

  There are no return pipes (return pipes) for returning the fuel from the first and second header pipes 171 and 181 to the fuel tank 34 and the fuel pump 95. The fuel does not return to the fuel tank 34 or the fuel pump 95.

As shown in FIGS. 6, 8, 10, and 11, the first fuel supply pipe 105 is provided between the fuel tank 34 and the air chamber 35 from the discharge port 95 a of the fuel pump 95 at the vehicle width center position. While rising through the gap Di, it turns to the left in the vehicle width direction and is connected to the inlet joint 172 at the left end 171a of the first header pipe 171.
Since the connection is made in this way, the fuel tank 34 can be raised and lowered with the first fuel supply pipe 105 connected to the fuel pump 95 when the fuel tank 34 is attached to and detached from the vehicle body frame 20.

On the other hand, the second fuel supply pipe 106 is connected to the outlet joint 173 of the right end 171b of the first header pipe 171 and the inlet joint 182 of the right end 181a of the second header pipe 181 so as to connect the engine 53 ( (See FIG. 6). Since a cam chain (a chain connecting the crankshaft and the camshaft) 53c passes on the right side of the engine 53, the surrounding space can be used effectively.
If the cam chain passes through the left side of the engine 53, piping may be performed in the reverse of the above configuration.

  FIG. 12 is a schematic view of a fuel injection device (modification) according to the present invention, and shows a fuel flow of the fuel injection device 100 as viewed from the rear of the motorcycle 10. In addition, the same code | symbol is attached | subjected about the same structure as the Example shown in the said FIGS. 6-11, and the description is abbreviate | omitted.

This figure shows that fuel does not return to the fuel tank 34 from the fuel pump 95 to the first fuel injection valves 103 through the second fuel injection valves 104 through the first and second fuel supply pipes 105 and 106. Indicates connection.
Specifically, the first header pipe 171 has only a fuel inlet (inlet joint 172). On the other hand, the second header pipe 181 has fuel inlet / outlet (inlet joint 182 and outlet joint 183) at both ends.

More specifically, the first header pipe 171 includes an inlet joint 172 at the right end (other end) 181b. The first header pipe 171 has no outlet joint. Fuel does not come out from the left end portion (one end portion) 171a of the first header pipe 171.
On the other hand, the second header pipe 181 includes an inlet joint 182 at the left end (other end) 181b and an outlet joint 183 at the right end (one end) 181a.

  An inlet joint 182 of the second header pipe 181 is connected to the discharge port 95a of the fuel pump 95 through the first fuel supply pipe 105, and the first fuel supply pipe 106 connects to the outlet joint 183 of the second header pipe 181. An inlet joint 172 of the header pipe 171 can be connected. That is, the fuel pump 95 includes the first fuel supply pipe 105, the second header pipe 181 (second fuel injection valve 104 ...), the second fuel supply pipe 106, and the first header pipe 171 (first fuel injection valve 103 ...). By continuously connecting in this order, the number of connected parts can be reduced and the number of parts can be reduced.

  The fuel supplied from the fuel tank 34 by the fuel pump 95 is the first fuel supply pipe 105 → the inlet joint 182 → the second header pipe 181 → the outlet joint 183 → the second fuel supply pipe 106 → the inlet joint 172 → the first header pipe. It flows along the route 171. Therefore, the fuel can be supplied to the first and second fuel injection valves 103, 104 through the first and second header pipes 171, 181.

  By the way, the fuel is first supplied from the fuel pump 95 to the lower second header pipe 181. During operation of the engine 53, fuel is always injected from the lower second fuel injection valves 104. For this reason, even if some air is mixed in the fuel in the fuel pipe, the fuel is injected from the second fuel injection valves 104 ... earlier and always. Therefore, the amount of air accumulated in the high-order first header pipe 171 and the first fuel injection valves 103 is very small, and the engine 53 can maintain a more stable performance.

  There are no return pipes (return pipes) for returning the fuel from the first and second header pipes 171 and 181 to the fuel tank 34 and the fuel pump 95. The fuel does not return to the fuel tank 34 or the fuel pump 95.

  In this way, the second fuel injection valves 104 are arranged at a lower position than the first fuel injection valves 103, and the first fuel injection valves 103 are provided from the fuel pump 95 by the first and second fuel supply pipes 105 and 106. Is connected to the second fuel injection valve 104 through the second fuel injection valve 104 or to the first fuel injection valve 103 through the second fuel injection valve 104 so that the fuel does not return to the fuel tank 34. As a result, the number of fuel supply pipes can be reduced, and the joints (connections) of the fuel supply pipes can be reduced. For this reason, fuel piping can be simplified. In addition, maintenance and inspection work is simplified, and workability is improved.

  In addition, although the fuel injection device for engines for motorcycles of the present invention is used for motorcycles in the embodiment, it can be applied to other than motorcycles.

  The engine fuel injection device for a motorcycle according to the present invention is suitable for a gasoline engine.

Left side view of a motorcycle according to the present invention. Left side view of a vehicle body according to the present invention Plan view of a vehicle body according to the present invention Plan view of a seat rail according to the present invention Exploded view of seat rail according to the present invention Left side view around engine, fuel tank and air chamber according to the present invention The sectional view which looked at the fuel injection device concerning the present invention from the left side Plan view of a fuel injection device according to the present invention Exploded view of air chamber according to the present invention Schematic diagram of a fuel injection device according to the present invention The rear view of the fuel injection device concerning the present invention Schematic diagram of a fuel injection device (modification) according to the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 34 ... Fuel tank, 34a ... Upper surface of fuel tank , 35 ... Air chamber (air cleaner case), 35b ... Upper surface of air chamber, 53 ... Engine, 53b ... End of cylinder arrangement direction, 53c ... Cam chain 91 ... Front wall of fuel tank , 93 ... Upper plate of fuel tank, 95 ... Fuel pump, 97 ... Extension, 100 ... Fuel injection device for engine for motorcycle , 101 ... Intake passage, 103 ... Fuel injection valve ( First fuel injection valve), 104 ... Fuel injection valve (intake passage side fuel injection valve, second fuel injection valve), 105 , 106 ... Fuel piping (first and second fuel supply pipes), 141 ... Upstream of the intake passage wall opposite the wall connected to the end (the upper wall which is fitted a fuel injection valve), 143 ... rear wall of the air chamber, between 143a ... disposing space, 145 ... inspection port, 146 ... lid, 146 ... front of the fuel injection valve, 146c ... upper wall of the air chamber which is formed on the front side, 152 ... mounting member, 154 ... wire, 155 ... filter element, 161 ... electric component, 171 ... first header pipe, 171b ... Cam Chain side end (right end (other end)), 181 ... second header pipe .

Claims (11)

An air chamber is provided at the upstream end of the intake passage of the engine, and fuel is directed toward the upstream end of the intake passage on the wall of the air chamber that faces the wall connected to the upstream end of the intake passage. By providing a fuel injection valve for injection, a fuel injection device for an engine for a motorcycle in which fuel piping and wiring are connected to the fuel injection valve outside the air chamber,
The fuel tank connecting the fuel pipe is disposed behind the air chamber, and the upper surface of the fuel tank is disposed higher than the upper surface of the air chamber,
The air chamber also serves as an air cleaner case including a filter element, the filter element is disposed on the front side of the fuel injection valve, and an upper wall formed on the front side is fitted with the fuel injection valve. It is placed higher than the wall,
The fuel tank includes an extension formed by extending the upper part of the front wall of the fuel tank forward while curving in a concave shape on the lower side,
A first header pipe for supplying the fuel to the fuel injection valve is connected and disposed below the extension;
Of the walls constituting the air chamber, an inspection port is provided on a wall surface where the fuel injection valve is not provided, and the inspection port is closed with a removable lid,
A lid constituting an upper wall of the air chamber is disposed at a front portion of the air chamber, and a fuel injection valve and the first header pipe are fixed to a rear portion of the upper wall of the air chamber;
The fuel injection valve and the first header pipe are disposed so as to be surrounded by the rear surface of the upper wall on the front side of the air chamber and the bottom surface of the extension portion of the fuel tank.
A fuel injection device for an engine for a motorcycle.   The engine for a motorcycle according to claim 1, wherein a rear portion of the upper wall of the air chamber to which the fuel injection valve and the first header pipe are fixed is configured as a non-detachable wall portion. Fuel injection device. The engine fuel injection device for a motorcycle according to claim 1, further comprising a removable cover for covering an air chamber exposed from the fuel tank.   The engine fuel injection device for a motorcycle according to claim 3, wherein the cover is formed so as to cover at least a part of the upper half of the fuel tank from the upper half of the air chamber.   The engine fuel injection device for a motorcycle according to claim 3 or 4, wherein the cover is detachably fixed to the vehicle body frame. The engine has a plurality of cylinders arranged in series,
The fuel injection valve is arranged along the cylinder arrangement direction for each cylinder,
The first header pipe is disposed along the cylinder arrangement direction and connected to the fuel injection valve to supply fuel,
In addition to the fuel injection valve provided in the air chamber, an intake passage side fuel injection valve is provided in the intake passage, and the intake passage side fuel injection valve is disposed along the cylinder arrangement direction. , Connected to a second header pipe for supplying the fuel,
The fuel pipe connects the first header pipe and the second header pipe, and is disposed between the fuel tank and the air chamber,
2. The fuel injection device for an engine for a motorcycle according to claim 1, wherein an arrangement space for the fuel pipe is formed so that a rear wall of the air chamber is recessed. The engine includes a cam chain at an end in the cylinder arrangement direction,
The fuel pipe is disposed at the cam chain side end of the first header pipe,
7. The fuel injection device for an engine for a motorcycle according to claim 6, wherein an arrangement space formed in the air chamber exposes the fuel pipe on the cam chain side end portion side. 2. The fuel injection device for an engine for a motorcycle according to claim 1, wherein the extended portion of the fuel tank is formed so as not to cover the inspection port. The fuel injection valve provided in the air chamber is a fuel injection valve for high-speed operation of the engine,
The engine fuel injection device for a motorcycle according to claim 6, wherein the intake passage side fuel injection valve is a fuel injection valve for low-speed operation of the engine.   10. The motorcycle for a motorcycle according to claim 1, wherein an electrical component for controlling the fuel injection valve in the vicinity of the fuel injection valve is attached to a wall constituting the air chamber. Engine fuel injection device. The air chamber is made of resin,
A mounting member separate from the resin air chamber is interposed between the upper wall of the resin air chamber and the fuel injection valve,
The mounting member is integrally formed by connecting a plurality of the mounting members,
The fuel injection device for an engine for a motorcycle according to any one of claims 1 and 6, wherein the fuel pipe is fastened to an attachment member so as to sandwich the fuel injection valve. .

Images