JP2005206033A - Rear wheel suspension device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain rigidity of a vehicle body frame and reduce the weight, and actively utilize a rear suspension as an appearance constitutional element of a vehicle body, and facilitate the maintenance, in a suspension device for a motorcycle. <P>SOLUTION: In the suspension device for a motorcycle, the vehicle body frame 1 has a pair of right and left main frame members 10 extending rearward from a head pipe 9, a swing arm 2 for a rear wheel is supported by the vehicle body frame 1 to be vertically swingable, the rear suspension 3 is interposed between the swing arm 2 for the rear wheel and the vehicle body frame 1 to be extended/contracted. The rear suspension 3 is arranged at a position displaced from a vehicle width center line O1 in a vehicle width direction to extend rearward from a rear end part of the main frame member 10. Preferably, the rear suspension 3 may be arranged in approximately the same straight line on which the main frame member 10 is arranged, when seen from a side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rear wheel suspension device for a motorcycle in which a rear suspension is interposed between a rear wheel swing arm and a vehicle body frame.

  A rear wheel suspension system for a motorcycle having a rear wheel rear suspension generally has a rear suspension disposed at the center of the vehicle width, and the front end of the rear suspension is connected to a cross member of a vehicle body frame. Is transmitted to the vehicle body frame via a cross member. In addition, there is a vehicle type in which the rear suspension is slightly shifted from the center in the vehicle width direction (for example, about 20 to 50 mm) in order to secure the space for arranging the vehicle accessory in the vicinity of the rear suspension. The front end of the suspension is connected to a cross member of the body frame.

As another example of the arrangement of the rear suspension, there is a vehicle type in which the rear suspension is arranged on the side of the engine arranged in the body frame, and the rear suspension is interposed between the front end portion of the body frame and the swing arm. (Refer to patent document 1 etc.).
JP 2001-106155 A

  If the rear suspension is located at or near the center of the vehicle width, various parts placed around the rear suspension will be in the way when maintenance, repair, or cleaning of the rear suspension is performed, and repair, cleaning, etc. Since the rear suspension is generally hidden from the outside, the rear suspension cannot be used as a mechanical appearance element of the vehicle body.

  If the front end of the rear suspension is connected to the cross member of the vehicle body frame, the load from the swing arm is first transmitted to the cross member and then to the main frame member, etc. This is a member arranged in the vehicle width direction. Therefore, the load from the swing arm is a lateral load with respect to the cross member, and the cross member is required to have high rigidity, which causes an increase in the weight of the body frame.

  Further, in the structure in which the rear suspension is disposed on the side of the engine in the vehicle body frame as in Patent Document 1 and the like, the rear suspension protrudes from the side of the engine to the left and right, resulting in difficulty in compactness and in the vicinity of the engine. By arranging the rear suspension, the oil in the rear suspension is easily affected by the heat from the engine.

(Object of invention)
The present invention devised the arrangement and mounting structure of the rear suspension, and effectively utilizes the existing shape of the body frame so that the load from the swing arm can be received without difficulty while reducing the weight of the body frame. At the same time, it is intended to facilitate maintenance and management of the rear suspension and to actively use it as an external component.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention supports a rear wheel swing arm that can swing up and down on a vehicle body frame having a pair of left and right main frame members extending rearward from the head pipe, In a motorcycle rear wheel suspension device in which a rear suspension is interposed between a rear wheel swing arm and the vehicle body frame in an extendable manner, the rear suspension extends rearward from a rear end portion of the main frame member. It is arranged at a position displaced in the vehicle width direction from the vehicle width center.

  According to a second aspect of the present invention, in the rear wheel suspension device of the motorcycle according to the first aspect, the rear suspension is substantially aligned with the main frame member when viewed from the side.

  According to a third aspect of the present invention, in the rear wheel suspension device of the motorcycle according to the first or second aspect, the swing arm has a pair of left and right arm members, and the rear suspension is an arm member as viewed from above. It is arranged at the position that almost overlaps

  According to a fourth aspect of the present invention, in the rear wheel suspension device of the motorcycle according to any one of the first to third aspects, the rear end portion of the rear suspension extends rearward on the substantially same straight line as the rear suspension. It connects with the said arm member via.

(1) The rear suspension is displaced from the center of the vehicle width to the position corresponding to the rear end of the main frame member in the vehicle width direction, making maintenance, repair, cleaning, etc. of the rear suspension easy from the outside. The rear suspension can be used as a mechanical appearance element of the vehicle body. In addition, since the amount of displacement in the vehicle width direction is up to the position of the rear end of the main frame member, the rear suspension does not overhang in the vehicle width direction and may interfere with the rider's or passenger's legs. Absent.

(2) The rear suspension is arranged so as to extend rearward from the rear end portions of the pair of left and right main frame members, so that the load (load) from the swing arm can be directly transmitted to the main frame members, The main frame member can receive most of the transmission load as an axial load, and can reduce the weight of the vehicle body frame while maintaining the strength against the load from the swing arm.

(3) When the rear suspension is arranged on the same straight line as the main frame member as viewed from the side, most of the load transmitted to the main frame member becomes an axial load, which reduces the weight of the vehicle body frame and the swing arm. The load resistance is further improved, and the mechanical appearance seen from the side is also improved.

(4) With respect to a swing arm having a pair of left and right arm members, the rear suspension is disposed at a position that substantially overlaps with the arm member when viewed from above, thereby reducing the weight of the swing arm while reducing the swing arm. The load resistance can be improved.

(5) When the rear end portion of the rear suspension is connected to the arm member via an auxiliary member extending rearward substantially on the same straight line as the rear suspension, the load resistance of the swing arm is further improved.

[First Embodiment of the Invention]
(Body frame structure)
1 to 4 show a first embodiment of the present invention. In each figure, a body frame 1, a swing arm 2 and a rear suspension 3 are shown by solid lines for a motorcycle equipped with a rear wheel suspension device according to the present invention. The engine 5, the front and rear wheels 6, 7 and the front fork 8 are indicated by phantom lines, and other portions are omitted.

  In FIG. 2 showing the left side view, the vehicle body frame 1 includes a pair of left and right main frame members 10, a pair of left and right subframe members (engine support members) 11, a pair of left and right lower frame members 12, A pair of rear frame members (seat rail members) 13, a pair of left and right rear auxiliary frame members 14, a plurality of cross members (cross pipes) 15, 16 and the like are included. The main frame member 10 has a front end coupled to the head pipe 9 and extends rearward in a straight line when viewed from the side, and the axis C1 of the main frame member 10 has a constant inclination angle α1 with respect to the horizontal line. It slopes downward.

  FIG. 3 is a plan view, and the left and right main frame members 10 swell to the opposite side of the vehicle width center O1 when viewed from above, and the position A1 is about 1/3 from the front of the main frame member 10 in the longitudinal direction. It extends in the vehicle width direction most, and after the maximum projecting position A1, it extends linearly so that the width between the main frame members 10 becomes narrower as it goes rearward. A branch-type joint 21 in which a plurality of connecting tubes branch is coupled to the rear end portion of the main frame member 10, and the left and right joints 21 are coupled by the rear end cross member 16. The cross member 15 on the front side is connected to the head pipe 9 via a stay member 17 projecting forward while connecting the maximum projecting position A1 of the left and right main frame members 10.

  FIG. 1 is a right side view, and the sub-frame member 11 is disposed on the lower side of each main frame member 10 and is substantially L-shaped. The front upper end portion of the sub-frame member 11 is the main frame member 10. The rear end portion of the subframe member 11 is connected to the rear end portion of the main frame member 10 via the joint 21. Engine support brackets 24 and 25 are provided on the curved portion (bent portion) of each subframe member 11 and the joint 21, respectively. In particular, the engine support bracket 25 of the joint 21 is integrally formed with the joint 21. Yes.

  The lower frame member 12 is coupled to the rear end portion of the main frame member 10 via the joint 21 and extends downward. A support body 30 is provided at the lower end portion of the lower frame member 12. Is provided with a support boss portion 31 and an engine support bracket 32 for a swing arm.

  The rear frame member 13 is coupled to the rear end portion of the main frame member 10 via the joint 21 and extends rearward to support the seat. The rear reinforcement frame member 14 has a front end coupled to the lower frame member 12 and extends rearward in a rearwardly inclined posture, and a rear end is coupled to the rear end portion of the rear frame member 13.

  Of the left and right joints 21, the right joint 21 is integrally formed with a support boss 35 for supporting the rear suspension.

  The engine 5 is supported on the vehicle body frame 1 by the three engine support brackets 24, 25 and 32.

(Swing arm structure)
4 is a plan view of the swing arm 2. The swing arm 2 includes an arm main body 41 formed in an H shape when viewed from above, and a reinforcing pipe group (46, 47, 48), and a pivot cylinder 42 coupled to the front end of the arm body 41.

  The arm body 41 includes a pair of left and right arm members 43 extending in the front-rear direction, and a cross member 44 connecting the middle portions in the front-rear direction of both arm members 43. Both arm members 43 are predetermined in the vehicle width direction. The rear axle is supported at the rear end portions of both arm members 43 by being arranged at intervals. A drive chain 59 is disposed in the vicinity of the left arm member 43.

  The auxiliary pipe group (46, 47, 48) includes a right auxiliary pipe 46 disposed on the right arm member 43 and an L-shaped left auxiliary pipe disposed on the left arm member 43 to the cross member 44. 47, a left front auxiliary pipe 48 extending from the left front end surface of the left auxiliary pipe 47 to the pivot cylinder 42, and the like. The right auxiliary pipe 46 has a front end coupled to the pivot cylinder 4 and a rear end coupled to the rear upper surface of the right arm member 43. The left auxiliary pipe 47 has a rear end coupled to the rear upper surface of the left arm member 43 and a front right end coupled to the right auxiliary pipe 46. A support boss 50 for supporting the rear end portion of the rear suspension 3 is provided on the upper surface of the right auxiliary pipe 46 and on the upper surface of the connecting portion with the left auxiliary pipe 47.

  In FIG. 1 showing the right side view, the right reinforcing pipe 46 is formed in a mountain shape so that the mounting position of the support boss 50 is the apex when viewed from the side, and the inclination angle α3 of the rear portion from the apex. Is substantially coincident with the inclination angle α1 of the main frame member 10.

  In FIG. 2 showing the left side view, the left side auxiliary pipe 47 is arranged in a rearwardly downward inclined manner, the front end is supported by the cross member 44 by a longitudinal stay pipe 55, and the left front auxiliary pipe 48 is in a downwardly downwardly inclined shape. Inclined.

  The front end pivot cylinder 42 of the swing arm 2 is disposed between the left and right lower brackets 30 of the vehicle body frame 1 as shown in FIG. 4 and is supported by the lower bracket 30 so as to be rotatable via a pivot shaft (not shown). Yes.

(Rear suspension mounting structure)
In the plan view of the swing arm 2 in FIG. 4, the rear suspension 3 is a shock absorber that combines, for example, a hydraulic shock absorber 60 and a buffer coil spring 61, and resists damping oil in the hydraulic shock absorber 60 and the coil spring 61. The bifurcated mounting boss 53 is formed at the rear end, and the rear end mounting boss 53 is provided at the top of the right auxiliary pipe 46 of the swing arm 2. It is connected to the support boss 50 via a connecting pin 51 so as to be rotatable. A single mounting boss 54 is formed at the front end of the rear suspension 3.

  In the plan view of the vehicle body frame 1 in FIG. 3, the rear suspension 3 is displaced to the right from the vehicle width center line O1 and is disposed parallel to the vehicle width center line O1 when viewed from above. The direction displacement amount D is matched with the displacement amount of the rear end portion of the right main frame member 10 with respect to the vehicle width center line O1. A front end mounting boss 54 of the rear suspension 3 is rotatably connected to a support boss 35 provided on the rear end joint 21 of the right main frame member 10 via a connecting pin 56. That is, the rear suspension 3 is connected to the rear end portion of the right main frame member 10 via the joint 21 so as to continuously extend rearward from the rear end portion of the right main frame member 10. As described above, the rear suspension 3 that extends rearward from the rear end portion of the right main frame member 10 is substantially at least partially connected to the right arm member 43 when viewed from above with respect to the swing arm 2 as shown in FIG. It is also located so as to overlap.

  In the right side view of FIG. 1, the rear suspension 3 is continuous from the rear end of the right main frame member 10 as described above, and extends rearwardly in a downwardly inclined manner, and the inclination angle α2 with respect to the horizontal line is the main frame It substantially coincides with the inclination angle α1 of the member 10. That is, when viewed from the side, the axis C2 of the rear suspension 3 is aligned with the axis C1 of the right main frame member 10.

  Further, the inclination angle α3 of the rear half of the right auxiliary pipe 46 of the swing arm 2 also substantially coincides with the inclination angle α1 of the right main frame member 10, and the rear suspension 3 is attached to the support boss 50 formed at the top of the right auxiliary pipe 46. Since the rear end portions are connected, the axial center line C3 of the rear half portion of the right auxiliary pipe 46 is slightly shifted downward with respect to the axial center line C1 of the right main frame member 10 and the axial center line C2 of the rear suspension 3. Although it is in the state, it is an arrangement that is almost close to the same linear arrangement.

(Function)
In FIG. 1, when the swing arm 2 swings up and down relatively with respect to the vehicle body frame 1 during traveling, the load during ascent is transmitted from the right auxiliary pipe 46 to the rear suspension 3 and is attenuated by the rear suspension 3. The rear suspension 3 is connected to the rear end portion of the right main frame member 10 so as to continue from the right main frame member 10, and when viewed from the side, the rear suspension 3 is transmitted to the vehicle body frame 1. Since the right main frame member 10 and the right main frame member 10 are arranged on the same straight line, the vehicle body frame 1 receives the load from the rear suspension 3 only as the axial load of the right main frame member 10. That is, since a lateral load is hardly applied, the load from the swing arm 2 can be received without increasing the thickness of the body frame 1 and the pipe diameter.

  Further, as in the present embodiment, when the support boss 35 supporting the front end portion of the rear suspension 3 and the engine mounting bracket 25 are integrally formed with the joint 21, the frame rigidity at the joint 21 portion is improved, and The rigidity of the engine can be used to support the load of the swing arm 2, and the weight of the entire body frame can be achieved.

  Since the rear suspension 3 is disposed so as to extend rearward from the rear end portion of the right main frame 10, the rear suspension 3 itself can be actively used as an element of the mechanical appearance of the motorcycle, and maintenance from the outside can be performed. Inspection and repair can be done easily. Further, since the rear suspension 3 is aligned with the right main frame member 10 as viewed from the side, it is excellent as an appearance element.

[Second Embodiment of the Invention]
FIG. 5 shows a second embodiment of the present invention, in which the rear end portion of the rear suspension 3 is connected to the swing arm 2 by a link mechanism 70. The link mechanism 70 includes, for example, a triangular first link lever 71 and a rod-shaped second link lever 72, and the rear end mounting boss 51 of the rear suspension 3 swings via the first link lever 71. The second link lever 72 is connected to the arm 2 and is pivotally connected between the first link lever 71 and the lower bracket 30. By this link mechanism 70, an upward swing stroke of the swing arm 2 is achieved. Are sequentially increased and transmitted to the rear suspension 3.

  Other configurations are the same as those of the first embodiment, and the same components and parts are denoted by the same reference numerals.

[Other Embodiments of the Invention]
(1) In the above embodiment, as shown in FIGS. 3 and 4, the single rear suspension 3 is arranged on the right side to avoid interference with the drive chain 59, but on the same left side as the drive chain arrangement side. It can also be set as the structure to arrange. Alternatively, two rear suspensions 3 may be provided and connected to the rear end portions of the left and right main frame members, respectively.

  The present invention can be applied to various motorcycles such as motorcycles for general use or racing.

1 is a right side view of a body frame or the like of a motorcycle according to a first embodiment of the present invention. FIG. 2 is a left side view of the same body frame and the like as in FIG. 1. It is a top view of the same vehicle body frame etc. as FIG. It is a top view of the swing arm of FIG. FIG. 4 is a right side view of a body frame or the like of a motorcycle according to a second embodiment of the present invention.

Explanation of symbols

1 Body frame 2 Swing arm 3 Rear suspension 6 Front wheel 7 Rear wheel 9 Head pipe 10 Main frame member 21 Joint 31 Swing arm support boss 35 Rear suspension support boss 41 Swing arm main body 43 Arm member 46 Right side auxiliary pipe

Claims (4)

A rear frame swing arm is supported on a vehicle body frame having a pair of left and right main frame members extending rearward from the head pipe so as to swing up and down, and a rear suspension is extended and contracted between the rear wheel swing arm and the vehicle body frame. In the rear wheel suspension system of the motorcycle that can be interposed,
The rear suspension of a motorcycle, wherein the rear suspension is disposed at a position displaced in the vehicle width direction from the center of the vehicle width so as to extend rearward from a rear end portion of the main frame member.   2. The rear wheel suspension device according to claim 1, wherein the rear suspension is disposed substantially on the same straight line as the main frame member as viewed from the side.   3. The motorcycle according to claim 1, wherein the swing arm has a pair of left and right arm members, and the rear suspension is disposed at a position substantially overlapping with the arm member when viewed from above. Rear wheel suspension system. The automatic rear end according to any one of claims 1 to 3, wherein a rear end portion of the rear suspension is connected to the arm member via an auxiliary member extending rearward on substantially the same straight line as the rear suspension. Rear wheel suspension for motorcycles.

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