JP5339602B2 - 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 a balancer is disposed at the front of the engine (for example, see Patent Document 1).

JP 2001-171585 A

  By the way, in the motorcycle described in Patent Document 1, since the balancer is disposed in the front part of the engine, the balancer projects forward, and the overall length of the engine becomes long. As a result, since the crankshaft is disposed relatively rearward of the vehicle, the shared load of the front wheels has been reduced.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a motorcycle capable of increasing a load sharing of a front wheel by arranging a crankshaft in front of the vehicle.

In order to achieve the above object, the invention according to claim 1 is a motorcycle including an engine disposed between a front wheel and a rear wheel, a crankshaft disposed along a vehicle width direction, and a cylinder tilted backward. The engine balancer shaft is disposed between the crankshaft and the front end of the crankweight of the crankshaft in the vehicle side view and above the crankshaft, and is connected to the front surface of the engine cylinder head. In addition, the intake system component extends obliquely upward from the front surface of the cylinder head and is disposed above the balancer shaft, and the engine starter motor is disposed between the balancer shaft and the intake system component. To do.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, a bulging portion that covers the outer periphery of the balance weight of the balancer shaft is provided in the crankcase of the engine, and the boss of the engine hanger is provided at the bulging portion. It is characterized by providing.

The invention according to claim 3, in addition to the configuration of the invention according to claim 2, wherein the scan Tatamota is supported by the swollen portion.

According to a fourth aspect of the invention, in addition to the configuration of the first aspect of the invention, the center axis of the starter motor is arranged between the crankshaft and the front end of the crankweight and above the crankshaft in a vehicle side view. It arrange | positions at the feature.
According to a fifth aspect of the invention, in addition to the configuration of the first aspect of the invention, the intake system component includes a throttle body, and the throttle body is disposed directly above the balancer shaft and the starter motor. And
According to a sixth aspect of the invention, in addition to the configuration of the fifth aspect of the invention, the throttle body has a cylindrical throttle body body that forms a part of the intake passage of the intake system parts, and opens and closes the intake passage. And a control motor for controlling the opening of the throttle valve, and the control motor is disposed on the opposite side of the starter motor with the throttle body body as a center.
According to a seventh aspect of the invention, in addition to the configuration of the sixth aspect of the invention, the throttle body further includes an injector for injecting fuel, and the injector is arranged on the same side as the starter motor with the throttle body body as a center. It is characterized by arranging.

  According to the motorcycle of claim 1, the balancer shaft of the engine is disposed between the crankshaft and the front end of the crankweight of the crankshaft and above the crankshaft in a side view of the vehicle. The overhang can be suppressed and the overall length of the engine can be shortened. Thereby, since a crankshaft is arrange | positioned ahead of a vehicle, the shared load of a front wheel can be increased.

  According to the motorcycle of the second aspect, the engine crankcase is provided with the bulging portion that covers the outer periphery of the balance weight of the balancer shaft, and the bulging portion is provided with the boss of the engine hanger. Since the projecting portion can be shared, the weight of the engine can be reduced.

  According to the motorcycle of the third aspect, since the starter motor of the engine is supported by the bulging portion, it is possible to suppress the starter motor from protruding from the engine, so that the engine can be downsized.

  According to the motorcycle of claim 4, the starter motor is disposed between the crankshaft and the front end of the crankweight and above the crankshaft in the side view of the vehicle. The mass of the motorcycle can be concentrated.

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. In the present embodiment, the crankshaft 55 is disposed along the vehicle width direction.

  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.

  Further, a substantially triangular bulging portion 75 covering the outer periphery of the balance weight 72 is integrally formed at the front end portion of the crankcase 51, and the engine hanger plate 33 is bolted to the front end portion of the bulging portion 75. A boss 75a for fastening is formed. Further, a starter motor 76 for rotating the crankshaft 55 and starting the engine 50 is fixed to the upper surface of the bulging portion 75.

  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.

  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 includes an air cleaner box 97, an air cleaner element 98 housed in the air cleaner box 97, and a second injector 102 that injects fuel into the inlet opening of the intake pipe 93.

  In the present embodiment, as shown in FIG. 3, the balancer shaft 71 includes a vertical line L1 passing through the center of the crankshaft 55 and the front end of the crank weight 55a provided on the shaft of the crankshaft 55 in a side view of the vehicle. It is arranged above the horizontal line L3 passing through the perpendicular line L2 and passing through the axial center of the crankshaft 55.

  Further, in the present embodiment, as shown in FIG. 3, the center shaft 76a of the starter motor 76 has a perpendicular line L1 passing through the center of the crankshaft 55 and a perpendicular line L2 passing through the front end of the crank weight 55a in a side view of the vehicle. And above the horizontal line L3 passing through the center of the crankshaft 55.

  As described above, according to the motorcycle 10 of the present embodiment, the balancer shaft 71 is located between the vertical line L1 passing through the center of the crankshaft 55 and the vertical line L2 passing through the front end of the crankweight 55a in the vehicle side view. In addition, since the balancer 70 is disposed above the horizontal line L3 passing through the axial center of the crankshaft 55, the forward extension of the balancer 70 can be suppressed, and the overall length of the engine 50 can be shortened. Thereby, since the crankshaft 55 is arrange | positioned ahead of a vehicle, the shared load of the front wheel WF can be increased.

  Further, according to the motorcycle 10 of the present embodiment, the bulging portion 75 that covers the outer periphery of the balance weight 72 is provided at the front end portion of the crankcase 51 of the engine 50, and the engine hanger plate 33 is bolted to the bulging portion 75. Since the boss 75a is provided, the boss 75a and the bulging portion 75 of the engine hanger plate 33 can be shared, so that the weight of the engine 50 can be reduced.

  Further, according to the motorcycle 10 of the present embodiment, since the starter motor 76 is supported by the bulging portion 75, the overhang of the starter motor 76 from the engine 50 can be suppressed, so that the engine 50 can be reduced in size. be able to.

  Further, according to the motorcycle 10 of the present embodiment, the center shaft 76a of the starter motor 76 is located between the vertical line L1 passing through the center of the crankshaft 55 and the vertical line L2 passing through the front end of the crank weight 55a in the vehicle side view. In addition, since the starter motor 76 can be brought closer to the crankshaft 55 because it is arranged above the horizontal line L3 passing through the center of the crankshaft 55, the mass of the motorcycle 10 can be concentrated.

10 Motorcycle 33 Engine hanger plate (engine hanger)
50 Engine 51 Crankcase 52 Cylinder block 52a Cylinder 55 Crankshaft 55a Crank weight 70 Balancer 71 Balancer shaft 72 Balance weight 75 Inflated part 75a Boss 76 Starter motor 76a Central axis WF Front wheel WR Rear wheel L1 Vertical line passing through the axis of the crankshaft L2 Vertical line passing through the front end of the crank weight L3 Horizontal line passing through the center of the crankshaft

Claims (7)

In a motorcycle including an engine that is disposed between a front wheel and a rear wheel, a crankshaft is disposed along a vehicle width direction, and a cylinder is tilted backward,
The engine balancer shaft is disposed between the crankshaft and the front end of the crankweight of the crankshaft, and above the crankshaft in a vehicle side view ,
An intake system component connected to the front surface of the cylinder head of the engine;
The intake system component extends obliquely upward from the front surface of the cylinder head and is disposed above the balancer shaft.
The motorcycle according to claim 1, wherein the starter motor of the engine is disposed between the balancer shaft and the intake system component . Providing a bulging portion covering the outer periphery of the balance weight of the balancer shaft in the crankcase of the engine,
The motorcycle according to claim 1, wherein a boss of an engine hanger is provided at the bulging portion. The motorcycle according to claim 2, characterized in that before kissing Tatamota is supported by the swollen portion The motorcycle according to claim 1, wherein a center axis of the starter motor is disposed between the crankshaft and a front end of the crankweight and above the crankshaft in a side view of the vehicle. The intake system parts include a throttle body,
The motorcycle according to claim 1, wherein the throttle body is arranged in a direction directly above the balancer shaft and the starter motor. The throttle body includes a cylindrical throttle body body that forms a part of an intake passage of the intake system component, a throttle valve that opens and closes the intake passage, and a control motor that controls the opening of the throttle valve. Including
6. The motorcycle according to claim 5, wherein the control motor is disposed on the side opposite to the starter motor with the throttle body body as a center. The throttle body further includes an injector for injecting fuel,
The motorcycle according to claim 6, wherein the injector is disposed on the same side as the starter motor with the throttle body body as a center.

Images