JP4766901B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle such as a low floor scooter vehicle having a swing unit structure.

  As an example of a motorcycle, a power unit including an internal combustion engine, a transmission mechanism, a clutch, and the like is connected to a vehicle body frame via a suspension link, and the suspension link serves to attenuate vibration transmitted from a rear wheel supported by the power unit. Is secured. Further, there has been proposed one in which a compression rod is arranged in front of the suspension link and both ends of the compression rod are connected to the power unit and the vehicle body frame, respectively, so that the rigidity in the longitudinal direction of the vehicle body is increased (for example, Patent Document 1).

Japanese Patent No. 3316107 (page 3, FIG. 2)

  However, in the motorcycle described in Patent Document 1, since the suspension link and the compression rod are concentrated and connected at one place in the front part of the power unit, the rear wheel tilts in the falling direction depending on the road surface condition, and the power unit When a load in the roll direction is generated, the load concentrates in one place. For this reason, it is necessary to increase the rigidity with respect to the tilt of the power unit in the roll direction and the tilt of the rear wheel in the fall-down direction. In this case, it is conceivable to increase the spring rate of the elastic body of the suspension link, but the vibration reduction efficiency is lowered. Alternatively, it is conceivable to increase the width of the suspension link to increase the rigidity in the tilt direction, but the width of the vehicle body is increased.

  On the other hand, in recent years, there has been a strong demand for a large displacement of a low floor scooter. When increasing the displacement of an internal combustion engine of a power unit, the power unit becomes larger and the weight increases as the displacement of the internal combustion engine increases. Therefore, it is more difficult to achieve both the improvement of the rigidity in the tilt direction and the reduction of the vibration of the suspension link or the restriction of the enlargement of the vehicle body.

  The present invention has been made to solve such a problem, and the object thereof is to maintain the vibration reduction efficiency even in the case of increasing the displacement of the internal combustion engine, while maintaining the vibration reduction efficiency in the roll direction of the power unit with respect to the vehicle body frame. An object of the present invention is to provide a motorcycle capable of regulating movement and improving the running stability of a vehicle.

In order to achieve the above object, the invention according to claim 1 is a motorcycle having a unit swing structure in which a power unit including an internal combustion engine and a drive system is connected to a vehicle body frame via a vibration isolation link. The auxiliary link is disposed at a rear position of the vibration isolating link disposed between the vehicle body frame and the body frame, and restricts the movement of the power unit in the roll direction with respect to the vehicle body frame. A first link that is movably connected, a second link whose one end is pivotally connected to the power unit, and the other ends of the first link and the second link are relatively rotatable, and the vehicle A connecting portion that is connected so as to be relatively movable in the width direction, and the connecting portion is located behind the connection position on the vehicle body frame side of the first link and the connection position on the power unit side of the second link. Characterized in that it located.

The invention according to claim 2 is characterized in that, in addition to the invention according to claim 1 , a rear cushion for suspension on the vehicle body frame is provided at the rear end portion of the power unit.

According to the motorcycle according to claim 1, the auxiliary link is provided at a rear position of the vibration isolation link arranged between the power unit and the body frame, and restricts the movement of the power unit in the roll direction relative to the body frame. Even if the displacement of the internal combustion engine is increased, the movement stability of the vehicle can be improved by restricting the movement of the power unit in the roll direction relative to the vehicle body frame while maintaining the vibration reduction efficiency. The auxiliary link includes a first link having one end rotatably connected to the body frame, a second link having one end rotatably connected to the power unit, and a first link and a second link. And a connecting portion that connects the other end portions so as to be relatively rotatable and relatively movable in the vehicle width direction, and the connecting portion includes a connection position on the vehicle body frame side of the first link and a power unit side of the second link. Therefore, it is possible to efficiently support the movement of the power unit in the roll direction relative to the body frame. Moreover, since the axial dimension of the first link and the second link can be lengthened and the displacement amount in the vehicle height direction of each link can be increased, the stroke of the rear wheel for absorbing the impact from the road surface can be sufficiently increased. Can be secured. Furthermore, since it is connected so as to be relatively movable in the vehicle width direction, it has a degree of freedom in the yaw direction, so that it is possible to ensure turning performance.

Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, a low floor scooter vehicle is taken as an example of a motorcycle.
1 to 4 show an embodiment of a motorcycle according to the present invention, FIG. 1 is a side view for explaining an embodiment of the motorcycle according to the present invention, and FIG. 2 is an automobile shown in FIG. 3 is an enlarged side view of the two-wheeled vehicle, FIG. 3 is a view of the auxiliary link as viewed from the direction of arrow A in FIG. 2, and FIG. 4 is an enlarged cross-sectional view of a main part for explaining a modification of the auxiliary link. Note that “front”, “rear”, “left”, and “right” follow the direction viewed from the driver, Fr indicates the front side, and Rr indicates the rear side. The drawings are to be viewed in the direction of the reference numerals.

  As shown in FIG. 1, a scooter vehicle 1 as an embodiment of a motorcycle according to the present invention includes a cradle-type vehicle body frame 2, a front fork 4 attached to a head pipe 3 of the vehicle body frame 2, and the front fork. 4 is disposed in a cradle space surrounded by each frame of the body frame 2 and a front fender 6 that covers the front wheel 5 attached to the front wheel 5 and a front fender 6 that covers the top of the front wheel 5. A fuel tank 8, a radiator reserve tank 9 and a radiator 10, a power unit 12 disposed behind the cradle space and provided with a water-cooled internal combustion engine 11 and a drive system, and a protection for suspending the power unit 12 on the vehicle body frame 2 The swing link 13 and the rear end of the power unit 12 are suspended from the body frame 2. It includes a rear cushion 14 for a wheel 15 after attached to the rear of the power unit 12, a seat 16 disposed above the body frame 2, a body cover 17 covering the vehicle body frame 2, a. In FIG. 1, 18 is a headlamp, 19 is a blinker, 20 is a fueling lid, 21 is a spark plug inspection lid, 22 is a main stand, 23 is an air cleaner, 24 is a rear grip, 25 is a tail lamp, and 26 is a rear fender. It is.

  The vehicle body frame 2 includes a main frame 51 configured in a reverse shape in a side view by connecting a front pipe 52 at the front and rear pipes 53L and 53R at the rear by a Y-shaped joint 54, and an upper end. The lower subframes 55L and 55R are coupled to the front end portions of the rear pipes 53L and 53R, and the front end portion is coupled to the head pipe 3, and the rear end portion is coupled to the lower end portions of the lower subframes 55L and 55R. Shaped subframes 56L, 56R, rear subframes 57L, 57R whose front ends are coupled to the center of the lower subframes 55L, 55R, rear ends are coupled to the rear of the rear pipes 53L, 53R, and a cross pipe (not shown) , Brackets and stays.

  As shown in FIG. 2, the anti-vibration link 13 suspends the power unit 12 from the vehicle body frame 2, and the anti-vibration link 13 is a plate-like body that is substantially U-shaped in plan view. Cylindrical portions (not shown) into which the rubber bushes are press-fitted are integrally formed on the left and right. In addition, a cylindrical engine hanger (not shown) connected to the power unit 12 is integrally formed at the lower end portion of the vibration isolation link 13. And the cylindrical part of the upper end part of the vibration isolating link 13 is rotatably bolted to the bracket 27 welded between the rear pipes 53L, 53R and the rear sub frames 57L, 57R of the vehicle frame 2, and the lower end part. The engine hanger supports the power unit 12 with bolts so as to be swingable in the longitudinal direction of the vehicle body.

  And in this embodiment, the auxiliary link 30 which is arrange | positioned in the back position of the anti-vibration link 13 and connects the power unit 12 and the vehicle body frame 2 is provided. The auxiliary link 30 restricts the movement of the power unit 12 in the roll direction with respect to the vehicle body frame 2.

  The auxiliary link 30 is disposed in a substantially triangular space 38 between the power unit 12 and the vehicle body frame 2 in a side view from the vehicle width direction. Here, the space 38 is a substantially triangular space 38 surrounded by a two-dot chain line in FIG.

  As shown in FIGS. 2 and 3, the auxiliary link 30 includes a first link 31 having one end rotatably connected to the vehicle body frame 2 and a second link having one end rotatably connected to the power unit 12. A link 32 and a connecting portion 35 that connects the other end portions of the first link 31 and the second link 32 so as to be relatively rotatable and relatively movable in the vehicle width direction are provided.

  The first link 31 is a cylindrical body having a rectangular cross section, and has a needle bearing (not shown) at one end and is bolted to a bracket 33 welded to the rear subframe 57L of the vehicle body frame 2 so as to be rotatable. The cylindrical portion 31a is integrally formed. Further, a bracket 31b that is connected to a cylindrical portion 32b of the second link 32 described later is integrally formed at the other end of the first link 31. Moreover, a bolt insertion hole (not shown) is formed in the cylindrical portion 31a and the bracket 31b along the vehicle width direction.

  The second link 32 is a cylindrical body having a square cross section, and is a bracket that is bolted to a suspension portion 34 formed integrally with the power unit 12 at one end portion thereof via a needle bearing (not shown). 32a is integrally formed. Further, a cylindrical portion 32b that is connected to the bracket 31b of the first link described above is formed integrally with the other end portion of the second link 32. Further, a bolt insertion hole (not shown) is formed in the bracket 32a along the vehicle width direction. Further, the cylindrical portion 32b is formed with an insertion hole 32c for inserting a shaft portion 36, which will be described later, and a fitting hole 32d for internally fitting and fixing the linear bearing 37 along the vehicle width direction.

  As shown in FIG. 3, the connecting portion 35 includes a bracket 31b formed integrally with the other end of the first link 31, a cylindrical portion 32b formed integrally with the other end of the second link 32, and a bracket. A cylindrical shaft portion 36 that is bolted to 31b, and a linear bearing 37 that is assembled to the outer peripheral surface of the shaft portion 36 and is fitted in the cylindrical portion 32b together with the shaft portion 36. The direction length is formed to be shorter than the shaft portion 36.

  Then, the shaft portion 36 fitted into the cylindrical portion 32b of the second link 32 is bolted to the bracket 31b of the first link 31 via the linear bearing 37, so that the shaft portion 36 and the cylindrical portion 32b are relative to each other. It can be rotated and can be relatively moved (slidably moved) in the vehicle width direction, and the shaft can be tilted and supported with high rigidity.

  The connecting portion 35 is located behind the connection position of the first link 31 on the vehicle body frame 2 side and the connection position of the second link 32 on the power unit 12 side, that is, the cylindrical portion 31a at one end of the first link 31 and the vehicle body frame. 2 and a position where the bracket 33 formed integrally with the second link 32 is connected and a position where the bracket 32a at one end of the second link 32 and the suspension part 34 formed integrally with the power unit 12 are connected. The

  And in the auxiliary link 30 comprised in this way, this auxiliary link 30 is arrange | positioned behind the anti-vibration link 13, and the 2nd link 32, the power unit 12, and the support position of the anti-vibration link 13 are made into the center. The rear wheel 15 can be integrated with the rear wheel 15 and can be circularly moved along the axis of the shaft portion 36 in a manner close to linear movement, giving freedom to the movement in the yaw direction generated in the power unit 12, and turning performance. Can be secured.

  Further, the connecting portion 35 is located at a position where the cylindrical portion 31a of the first link 31 and the bracket 33 of the vehicle body frame 2 are connected, and a position where the bracket 32a of the second link 32 and the suspension portion 34 of the power unit 12 are connected. Since the axial dimension of the 1st link 31 and the 2nd link 32 can be lengthened by being located in the back, the displacement amount of the vehicle height direction of the 1st, 2nd links 31 and 32 can be taken large. Thereby, the stroke of the rear wheel 15 can be sufficiently secured.

  As a modification of the auxiliary link 30 of the present embodiment, as shown in FIG. 4, the auxiliary link 30 includes an elastic material 41 made of rubber or the like and resin on the inner peripheral surface of the cylindrical portion 32 b of the second link 32. The collar 42 may be baked, and a linear bearing 37 may be fitted and fixed to the collar 42 so that the linear bearing 37 is supported via the elastic material 41.

  In this case, since the linear bearing 37 is supported by the elastic member 41, the torsional rigidity can be adjusted, and a degree of freedom can be given to the connecting portion 35 between the first link 31 and the second link 32. Assembling property of the auxiliary link 30 can be improved.

  In the motorcycle according to the present embodiment described above, it is disposed at the rear position of the vibration isolating link 13 disposed between the power unit 12 and the vehicle body frame 2 and restricts the movement of the power unit 12 relative to the vehicle body frame 2 in the roll direction. Since the auxiliary link 30 is provided, even when the displacement of the internal combustion engine is increased, the movement of the power unit 12 in the roll direction with respect to the vehicle body frame 2 is restricted while maintaining the vibration reduction efficiency, so that the running stability of the scooter vehicle 1 is improved. Can be improved.

  Further, in the motorcycle described above, the auxiliary link 30 is disposed in the substantially triangular space 38 between the power unit 12 and the vehicle body frame 2 in a side view from the vehicle width direction. It is efficiently arranged by effectively using the space between.

  Further, in the above-described motorcycle, the auxiliary link 30 includes a first link 31 having one end portion rotatably connected to the vehicle body frame 2 and a second link 32 having one end portion rotatably connected to the power unit 12. And a connecting portion 35 that connects the other end portions of the first link 31 and the second link 32 so as to be relatively rotatable and relatively movable in the vehicle width direction. Since the link 31 is positioned behind the connection position on the vehicle body frame 2 side of the link 31 and the connection position on the power unit 12 side of the second link 32, the movement of the power unit 12 with respect to the vehicle body frame 2 in the roll direction is efficiently supported, while the yaw. A degree of freedom can be given to the movement in the direction. Moreover, since the axial dimension of the first link 31 and the second link 32 can be lengthened and the displacement amount in the vehicle height direction of each link can be increased, the stroke of the rear wheel 15 for absorbing the impact from the road surface. Can be secured sufficiently. Furthermore, since the degree of freedom is given to the movement in the yaw direction, it is possible to ensure turning performance.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above embodiment, the case where the bracket is provided at the other end portion of the first link and the cylindrical portion is provided at the other end portion of the second link in the connecting portion is illustrated, but the present invention is not limited thereto. A cylindrical portion may be provided at the other end, and a bracket may be provided at the other end of the second link.

  In addition, the materials, shapes, dimensions, forms, numbers, locations, etc. of the vehicle, body frame, body cover, power unit, front wheel, rear wheel, rear cushion, vibration proof link, auxiliary link, bearing, etc., exemplified in the above embodiment are As long as the invention can be achieved, it is arbitrary and not limited.

1 is a side view for explaining an embodiment of a motorcycle according to the present invention. Fig. 2 is an enlarged side view of the motorcycle shown in Fig. 1. It is the figure which looked at the auxiliary link from the arrow A direction of FIG. It is a principal part expanded sectional view for demonstrating the modification of an auxiliary link.

Explanation of symbols

1 Scooter vehicle (motorcycle)
2 Body frame 11 Water-cooled internal combustion engine 12 Power unit 13 Anti-vibration link 15 Rear wheel 30 Auxiliary link 31 1st link 32 2nd link 33 Bracket 34 Suspension part 35 Connection part 36 Shaft part 37 Linear bearing 38 Space

Claims (2)

A power unit including an internal combustion engine and a drive system is a motorcycle having a unit swing structure connected to a vehicle body frame via an anti-vibration link,
An auxiliary link that is disposed at a rear position of the anti-vibration link disposed between the power unit and the body frame and restricts movement of the power unit in the roll direction relative to the body frame;
The auxiliary link includes a first link whose one end is rotatably connected to the body frame, a second link whose one end is rotatably connected to the power unit, the first link, and the second link. A connecting portion that connects the other end portions of the link so as to be relatively rotatable and relatively movable in the vehicle width direction, and
The motorcycle is characterized in that the connecting portion is located behind a connection position of the first link on the vehicle body frame side and a connection position of the second link on the power unit side. Wherein the rear end portion of the power unit, a motorcycle according to claim 1, wherein the rear cushion for suspending said vehicle body frame is provided.

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