JP5311650B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle, and more particularly to an engine of a motorcycle.

  2. Description of the Related Art A conventional motorcycle is known in which an engine cylinder is tilted backward, and an intake passage for intake air from the front of the engine and two injectors are provided in a throttle body (see, for example, Patent Document 1).

JP 2008-207790 A

  By the way, in the motorcycle described in Patent Document 1, since the cylinder axis is almost upright, the position of the center of gravity of the cylinder head becomes high, and it is necessary to bend the intake passage in order to secure the pipe length of the intake passage. was there. As a result, although the inlet opening of the intake passage is oriented in the vertical direction, in the fuel injection of the engine, it may be desired to promote the vaporization of fuel by arranging the injector so as to face the inlet opening of the intake passage. In the motorcycle described in Patent Document 1, since the inlet opening of the intake passage faces the air cleaner element, it is difficult to make the injector face the inlet opening.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to lower the center of gravity of the cylinder head to lower the center of gravity of the motorcycle and to face the injector at the inlet opening of the intake passage. It is an object of the present invention to provide a motorcycle that can be arranged in such a manner as to improve engine performance.

In order to achieve the above object, an invention according to claim 1 includes an engine disposed between a front wheel and a rear wheel, and an intake air disposed in front and above a cylinder of the engine and connected to a front side of the cylinder. In a motorcycle that includes a system part and an exhaust system part connected to the rear side of the cylinder, and inclines the cylinder backward, the central axis of the intake passage of the intake system part is configured linearly toward the head pipe, The inlet opening of the intake passage is surrounded by an air cleaner box, the injector is provided on the wall surface of the air cleaner box on the head pipe side on the central axis of the intake passage, a radiator is arranged adjacent to the front of the injector, and the injector is between the pair of left and right main frames extending rearward divided from the pipe to the left and right, arranged to overlap with the main frame in the vehicle side view And wherein the door.

According to the second aspect of the invention, in addition to the configuration of the first aspect of the invention, a rear cushion is provided along the substantially vertical direction adjacent to the rear of the engine, and the cylinder axis of the cylinder and the center of the rear cushion are provided. The intersection of the axes is arranged below the seating seat.

  According to the motorcycle of the first aspect, since the central axis of the intake passage of the intake system parts is linearly formed toward the head pipe, the angle between the central axis of the intake passage and the cylinder axis is widened. Since the center of gravity of the cylinder head can be lowered, the center of gravity of the motorcycle can be lowered. Further, since the seating position and the center of gravity position of the cylinder head can be brought close to each other while the intake passage is linear, the mass of the motorcycle can be concentrated. Further, the inlet opening of the intake passage is surrounded by an air cleaner box, and the injector is disposed on the wall surface of the air cleaner box on the head pipe side on the central axis of the intake passage, so that the injector faces the inlet opening of the intake passage. In addition, since the intake passage can be shortened, engine performance can be improved.

Further, according to the motorcycle according to claim 1, to place the radiator adjacent to the front of the injector, the injector, between the pair of left and right main frames extending rearward divided into right and left from the head pipe, the vehicle side Since it is disposed at a position overlapping the main frame in view, the radiator and the main frame can protect the injector from foreign matter from the outside.

According to the motorcycle of claim 2 , the rear cushion is provided along the substantially vertical direction adjacent to the rear of the engine, and the intersection of the cylinder axis of the cylinder and the center axis of the rear cushion is disposed below the seat. Therefore, the tilt angle of the cylinder can be increased. As a result, the crankshaft can be disposed in front of the vehicle even if the intake passage is linear, and therefore the shared load of the front wheels can be increased.

1 is a left side view for explaining an embodiment of a motorcycle according to the present invention. It is a left view of the periphery of the engine shown in FIG. FIG. 3 is a left side view of the engine shown in FIG. 2.

  Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the drawings. It should be noted that the drawings are viewed in the direction of the reference numerals, and in the following description, front, rear, left and right, and top and bottom are in accordance with the direction seen from the driver, and the front of the vehicle is Fr, rear is Rr, left is L, and right is R, upper is shown as U, and lower is shown as D.

  As shown in FIG. 1, the motorcycle 10 of the present embodiment includes a head pipe 12 provided at a front end of a vehicle body frame 11, a pair of left and right main frames 13 that are separated from the head pipe 12 to the left and right and extend rearwardly downward. A pair of left and right pivot frames 14 connected to the rear end portion of the main frame 13 and extending downward, a pair of left and right rear frames 15 connected to the upper end portion of the pivot frame 14 and extending rearward, and an intermediate portion of the pivot frame 14. A pair of left and right subframes 16 extending rearward, a pair of left and right rear frames 15 and a rear bracket 17 to which rear ends of the pair of left and right subframes 16 are connected, and a pair of left and right downframes extending downward from the head pipe 12. 18 is connected to the lower end of the down frame 18 and the lower end of the pivot frame 14. The tom frame 19 and a pair of left and right engine support frames 20 that connect the intermediate portion of the down frame 18 and the rear portion of the main frame 13 are configured. The engine 50 is attached to the down frame 18, the bottom frame 19, and the engine support frame 20. Is suspended.

  The motorcycle 10 includes a front fork 21 that is supported by the head pipe 12 so as to be steerable, a front wheel WF that is rotatably supported by the lower end portion of the front fork 21, and a steering wheel attached to the upper end portion of the front fork 21. The swing arm 23 is swingably supported on the pivot frame 14, the rear wheel WR is rotatably supported on the rear end of the swing arm 23, and the swing arm 23 is suspended from the pivot frame 14. The rear wheel suspension device 40 and a seating seat 25 attached above the rear frame 15 are provided. 1 is a shroud that covers the sides of the main frame 13 and the down frame 18, and 27 is a front fender that covers the front wheel WF.

  As shown in FIG. 1, the rear wheel suspension device 40 has a rear cushion 41 whose upper end is swingably attached to the upper end of the pivot frame 14, and a lower middle portion of the rear cushion 41 and the lower middle of the swing arm 23. And a first link 42 having a substantially triangular shape that slidably connects the first part 42 and a second link 43 that swayably connects the first link 42 and the lower end of the pivot frame 14.

  The engine 50 is a water-cooled single-cylinder engine, and as shown in FIGS. 2 and 3, the outer shell thereof is mainly a crankcase 51 and a cylinder block 52 attached to the front upper end of the crankcase 51. And a cylinder head 53 attached to the upper end of the cylinder block 52, and a cylinder head cover 54 covering the upper opening of the cylinder head 53. A radiator 31 for cooling the cooling water circulating in the engine 50 is attached to the down frame 18 disposed in front of the engine 50.

  As shown in FIG. 2, the engine 50 includes an engine hanger plate 32 that is bolted to the rear portion of the engine support frame 20, an engine hanger plate 33 that is bolted to the lower end portion of the down frame 18, and the bottom frame 19. Suspended by bolt fastening at an intermediate portion and disposed between the front wheel WF and the rear wheel WR.

  As shown in FIG. 3, a crankshaft 55 is rotatably supported on the crankcase 51, and a piston 57 is connected to the crankshaft 55 via a connecting rod 56. The piston 57 reciprocates in the cylinder axis C direction within the cylinder 52 a of the cylinder block 52. Further, in the present embodiment, the cylinder axis C is disposed so as to be rearwardly inclined toward the rear of the vehicle.

  A transmission 60 is housed in the rear part of the crankcase 51. The transmission 60 includes a main shaft 61 and a counter shaft 62 that are rotatably supported by the crankcase 51, and a kick start kick kick. A shaft 63, a shift drum 64, a plurality of drive gears 65 provided on the shaft of the main shaft 61, a plurality of driven gears 66 provided on the shaft of the counter shaft 62 and meshing with the plurality of drive gears 65, respectively. A kick gear 67 provided on the kick shaft 63 and meshing with the driven gear 66.

  A balancer 70 is housed in the front portion of the crankcase 51. The balancer 70 includes a balancer shaft 71 that is rotatably supported by the crankcase 51, and a balance weight 72 provided on the balancer shaft 71. . The balancer 70 is rotationally driven by the driving force of the crankshaft 55.

  The cylinder head 53 rotates with respect to the cylinder head 53, an intake valve 81 that opens and closes an intake port 53 a formed on the front surface of the cylinder head 53, an exhaust valve 82 that opens and closes an exhaust port 53 b formed on the rear surface of the cylinder head 53. A cam shaft 83 that is pivotally supported, a cam 84 that is provided on the cam shaft 83, a rocker shaft 85 that is provided on the cylinder head 53, and is pivotally supported by the rocker shaft 85, and is swung by the cam 84. The intake valve 81 is directly driven by a cam 84, and the exhaust valve 82 is driven by a rocker arm 86. That is, the engine 50 is a SOHC engine.

  As shown in FIG. 2, a throttle body 92 is connected to the intake port 53 a of the cylinder head 53 via a connection pipe 91, and an air cleaner 94 is connected to the upstream end of the throttle body 92 via an intake pipe 93. Is connected. In the present embodiment, the connection pipe 91, the throttle body 92, the intake pipe 93, and the air cleaner 94 are intake system components and are disposed in front of and above the cylinder block 52. In the present embodiment, the connection pipe 91, the throttle body 92, and the intake pipe 93 form an intake passage 90, and the central axis L <b> 1 of the intake passage 90 is configured linearly toward the head pipe 12. The

  As shown in FIG. 2, a muffler 96 is connected to the exhaust port 53 b of the cylinder head 53 via an exhaust pipe 95. In the present embodiment, the exhaust pipe 95 and the muffler 96 are exhaust system components.

  The throttle body 92 includes a throttle valve 92a that opens and closes the intake passage 90, a control motor 92b that controls the opening of the throttle valve 92a, and a first injector 101 that injects fuel into the intake port 53a.

  The air cleaner 94 is on the air cleaner box 97 that surrounds the inlet opening of the intake pipe 93 that forms the intake passage 90, the air cleaner element 98 that is accommodated in the air cleaner box 97, and the central axis L1 of the intake passage 90. The second injector 102 is provided on the wall surface 97 a on the head pipe 12 side of 97 and injects fuel into the inlet opening of the intake pipe 93.

  Further, in the present embodiment, as shown in FIG. 2, the radiator 31 is disposed in front of the second injector 102, and the second injector 102 is disposed between the pair of left and right main frames 13 in a side view of the vehicle. It is arranged at a position overlapping the main frame 13.

  Further, in the present embodiment, as shown in FIG. 2, the rear cushion 41 is disposed along the substantially vertical direction adjacent to the rear of the engine 50, and the cylinder axis C of the cylinder 52a and the center axis L2 of the rear cushion 41. Is located below the seating seat 25.

  As described above, according to the motorcycle 10 of the present embodiment, the central axis L1 of the intake passage 90 formed by the connection pipe 91, the throttle body 92, and the intake pipe 93, which are intake system components, is directed toward the head pipe 12. Therefore, since the angle between the central axis L1 of the intake passage 90 and the cylinder axis C becomes wider and the position of the center of gravity of the cylinder head 53 can be lowered, the center of gravity of the motorcycle 10 can be lowered. Can be planned. Further, since the seating position and the center of gravity of the cylinder head 53 can be brought close to each other while making the intake passage 90 linear, the mass of the motorcycle 10 can be concentrated. Further, the inlet opening of the intake pipe 93 that forms the intake passage 90 is surrounded by an air cleaner box 97, and the second injector 102 is located on the central axis L1 of the intake passage 90 on the wall surface 97a on the head pipe 12 side of the air cleaner box 97. Since the second injector 102 can be disposed so as to face the inlet opening of the intake passage 90, the intake passage 90 can be shortened, so that the engine performance can be improved.

  Further, according to the motorcycle 10 of the present embodiment, the radiator 31 is disposed adjacent to the front of the second injector 102, and the second injector 102 is divided into left and right from the head pipe 12 and extends rearward. Since the frame 13 is disposed at a position overlapping the main frame 13 in a side view of the vehicle, the radiator 31 and the main frame 13 can protect the second injector 102 from foreign matter from the outside.

  Further, according to the motorcycle 10 of the present embodiment, the rear cushion 41 is provided along the substantially vertical direction adjacent to the rear of the engine 50, and the intersection of the cylinder axis C of the cylinder 52a and the center axis L2 of the rear cushion 41. Since P is disposed below the seating seat 25, the inclination angle of the cylinder 52a can be increased. Thereby, even if the intake passage 90 is linear, the crankshaft 55 can be disposed in front of the vehicle, so that the shared load of the front wheels WF can be increased.

DESCRIPTION OF SYMBOLS 10 Motorcycle 12 Head pipe 13 Main frame 25 Seating seat 31 Radiator 41 Rear cushion 50 Engine 52 Cylinder block 52a Cylinder 90 Intake passage 91 Connection pipe (intake system parts)
92 Throttle body (intake system parts)
93 Intake pipe (intake system parts)
94 Air cleaner (intake system parts)
95 Exhaust pipe (exhaust system parts)
96 Muffler (exhaust system parts)
97 Air cleaner box 97a Wall surface 102 Second injector (injector)
WF Front wheel WR Rear wheel C Cylinder axis L1 Center axis of intake passage L2 Center axis of rear cushion P Intersection of cylinder axis and center axis of rear cushion

Claims (2)

An engine disposed between the front and rear wheels;
An intake system component disposed in front of and above the engine cylinder and connected to the front side of the cylinder;
An exhaust system component connected to the rear side of the cylinder,
In a motorcycle that tilts the cylinder backward,
The central axis of the intake passage of the intake system parts is configured linearly toward the head pipe,
Enclose the inlet opening of the intake passage with an air cleaner box,
An injector on the central axis of the intake passage and provided on the wall surface of the air cleaner box on the head pipe side ;
Placing a radiator adjacent to the front of the injector;
2. A motorcycle according to claim 1, wherein the injector is disposed between a pair of left and right main frames that are divided into left and right from the head pipe and extend rearward at a position overlapping the main frame in a side view of the vehicle . A rear cushion is provided along the substantially vertical direction adjacent to the rear of the engine,
The motorcycle according to claim 1, wherein an intersection of a cylinder axis of the cylinder and a center axis of the rear cushion is disposed below the seat.

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