JP4464588B2 - Suspension system for motorcycles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic two-wheel suspension system, and more particularly to an advantageous arrangement structure of the rear cushion unit . In the present application, the front / rear, left / right, and up / down directions related to the vehicle body are based on the straight traveling of the vehicle body and the front in the traveling direction.
[0002]
[Prior art]
There is a backbone frame as one of the body frame types in a motorcycle, and a main frame portion made of a single pipe member or the like disposed in the front-rear direction along the center of the vehicle body on the upper side of the engine, and the rear of the engine. A rear swing comprising a center frame portion made of one or a plurality of members arranged in the vertical direction, integrating the main frame portion and the center frame portion, and constituting a rear wheel suspension device in a lower portion of the center frame portion The front end of the arm is pivotably supported. As an example, in Japanese Patent No. 2719940, a rear cushion unit is disposed at the center of the vehicle body and its upper part is connected to the rear end of one main frame part, and a pair of center frame parts are provided on the left and right sides of the rear cushion unit. Things are shown.
Further, in this type of motorcycle, the rear cushion unit constituting the rear wheel suspension device is disposed on the front vehicle body center of the rear wheel, and the rear end portion of the main frame portion or the upper end portion of the center frame portion There may be employed a structure in which the vicinity (hereinafter, this portion is referred to as a rear upper portion of the backbone frame) and a rear swing arm are connected.
[0003]
[Problems to be solved by the invention]
By the way, when the rear cushion unit is arranged as in the above-described conventional example, the rear cushion unit is positioned between the center frame portion and the rear wheel, so that the rear wheel tends to shift rearward and the wheel base tends to become longer. In some cases, a rear cushion unit arrangement structure that can shorten the wheel base is desired. In Japanese Patent No. 2719940, a pair of center frame portions must be provided on the left and right sides of the rear cushion unit in order to shorten the wheel base. In addition, when a vertically swinging type driving seat is provided in the rear upper part of the backbone frame, it is also desirable to dispose the driving seat and the rear cushion unit so as not to interfere with each other. Therefore, the present invention aims to realize such a demand.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a suspension device for a motorcycle according to the present invention is provided with a swing arm for supporting a rear wheel in the vicinity of a rear lower end of a backbone frame so as to be swingable. In a suspension system for a motorcycle in which a rear cushion unit is disposed between upper parts, a rear part of the backbone frame is arranged vertically in the center of the vehicle body, and a support part of the rear cushion unit is provided as the rear swing arm. It is characterized by being arranged so as to overlap the rear side surface of the backbone frame in the left-right direction in a side view above the support portion.
[0005]
At this time, the driving seat is attached to the rear upper part of the backbone frame via a seat cushion so that the driving seat can swing up and down, and the seat cushion mounting portion of the driving seat and the support portion of the rear cushion unit are aligned in the left-right direction. It can be configured to be arranged in. Further, the seat cushion mounting portion can support the driving seat so as to be swingable with respect to the frame and can be integrally removed.
[0006]
【The invention's effect】
According to the present invention, in the frame structure employing a backbone type frame provided on the vehicle body center, a side view of the support portion of the rear cushion unit by the support portion above the rear swing arm in the lateral direction on the rear side of the backbone type frame because disposed so as to overlap with, it will be arranged offset to the rear cushion unit to the vehicle body laterally. For this reason, even if the rear cushion unit is brought closer to the rear wheel, it does not interfere with the rear wheel, the wheel base can be shortened, and a compact vehicle body can be obtained.
[0007]
Even if the driver's seat is mounted on the rear upper part of the backbone frame via a seat cushion so that it can swing up and down, the seat cushion mounting part of this driver's seat and the support part of the rear cushion unit are arranged side by side. By doing so, it becomes possible to prevent the rear cushion unit from interfering with the vicinity of the cushion mounting portion of the operation seat that swings up and down. In addition, the seat cushion mounting portion supports the operation seat so as to be swingable with respect to the backbone frame and can be removed integrally.
[0008]
An embodiment will be described below with reference to the drawings. 1 to 5 relate to the embodiment, FIG. 1 is a right side view of the whole, FIG. 2 is a perspective view of the whole shown obliquely from the right rear, FIG. 3 is a bottom view of the whole, and FIG. FIG. 5 is an enlarged view showing the upper mounting structure of the rear cushion unit from the diagonally right rear, and FIG. 6 is an enlarged view showing the opposite side of FIG.
[0009]
In these drawings, 1 is a front wheel, 2 is a pair of left and right front forks, 3 is a bottom bridge, 4 is a top bridge, 5 is a handle, and 6 is a head pipe. The head pipe 6 is integrated with the front end of the main frame portion 7 arranged in the front-rear direction along the center of the vehicle body. The main frame portion 7 is formed of a metal round pipe or the like, and is disposed obliquely downward from the head pipe 6 and has a center frame portion 8 that is bent and extends downward on the rear side, thereby forming a backbone frame. ing. Note that the main frame portion 7 and the center frame portion 8 can be formed continuously or integrally, or when separate members are integrated.
[0010]
A fuel tank 10 is supported on the main frame portion 7, and a horizontal engine 11 is disposed below and in the front space of the center frame portion 8 in the front-rear direction. The engine 11 is supported by a pair of left and right engine hanger mount stays 12 extending rearward from the center frame portion 8 and the head pipe 6 obliquely downward below the main frame portion 7.
[0011]
An operation seat 13 is supported on the upper portion of the center frame portion 8 through a seat cushion 14 so as to be swingable in the vertical direction, and the tip of the rear swing arm 15 is swung by a mounting shaft 16 at the lower end portion of the center frame portion 8. It is supported freely.
[0012]
A pair of left and right rear swing arms 15 are provided, and a rear wheel 17 is supported between rear ends of the rear swing arms 15. An upper portion of the rear wheel 17 is covered with a rear fender 18, a movable fender that is swingable integrally with the rear swing arm 15 is formed by stays 19, 20 and the like, and a tail lamp 21 is disposed at the rear thereof. The tail lamp 21 swings up and down together with the rear fender 18 which is a movable fender.
[0013]
Above the engine 11, an intake system component including a carburetor 24 and an air cleaner 25 is disposed. The air cleaner 25 is located in a space surrounded by the fuel tank 10, the center frame portion 8, and the engine hanger mount stay 12, and is vaporized. The device 24 is in a position overlapping the engine hanger mount stay 12 in a side view, and is connected to an intake port of a cylinder head 26 constituting the engine 11.
[0014]
The rear cushion unit 22 that constitutes a suspension device together with the rear swing arm 15 is positioned so as to substantially overlap the vicinity of the mounting portion of the operation seat 13 above the center frame portion 8 and the front end of the rear wheel 17 in a side view of the right rear swing arm 15. It is diagonally arranged between the stays 23 provided in the.
[0015]
The engine hanger mount stay 12 is made of an appropriate member such as a metal round bar or a pipe, and its rear end is connected to an upper portion of a crankcase 27 constituting the engine 11. The rear portion of the crankcase 27 is supported by the center frame portion 8, and steps 28 are provided so as to protrude laterally at the lower left and right sides of the crankcase 27, and a brake pedal 30 is provided in the vicinity of the right step 28. Yes.
[0016]
An exhaust pipe 31 extends from the exhaust port of the cylinder head 26, and the lower right side of the engine 11 extends rearward substantially horizontally and is connected to a muffler 32 supported on the bottom of the crankcase 27. The muffler 32 is disposed long in the front-rear direction from the lower part of the crankshaft of the engine 11 to the vicinity of the rear wheel 17, and the tail pipe 33 extends rearward from the rear end thereof. The rear end portion of the tail pipe 33 has a large-diameter portion 34, and between the front portion and the portion of the exhaust pipe 31 on the rear side of the exhaust pipe 31 above the muffler 32, each side is made of a sheet metal having a substantially horizontal linear shape. Covered with a muffler cover 35.
[0017]
As apparent from FIGS. 2, 4, and 5, the mounting portion of the operation seat 13 is fixed to the seat stay 36 provided on the upper left and right of the center frame portion 8 with one end of the link 37 constituting the seat cushion mounting portion fixed by a bolt 38. The tip is fastened with a nut 39 and is detachably attached.
[0018]
One end of a seat cushion 14 made of a coil spring is attached to the rear portion of the link 37, and the other end is attached to a stay 41 that protrudes downward in the center of the rear portion of the seat frame 40 with a pin 42. An adjustment rod 43 disposed in the axial direction inside the seat cushion 14 is slidably passed through the pin 42, and an adjustment nut 44 is fastened to the tip thereof. A hinge portion 40 a provided at the front end portion of the seat frame 40 and the front end portion of the link 37 are connected to each other by a shaft 45 so as to be swingable.
[0019]
Therefore, the driving seat 13 swings up and down around the shaft 45 due to the vibration of the vehicle body, and at this time, the seat cushion 14 can be expanded and contracted to buffer the impact load. Further, the operation seat 13 can be integrally removed from the vehicle body frame by removing the bolt 38 and the nut 39. An escape recess 10a is formed at the rear of the fuel tank 10 to avoid interference when the operation seat 13 is swung (FIG. 2).
[0020]
As is apparent from FIG. 5 , a cushion mounting portion 46, which is a welding bolt, is provided on the right side surface of the center frame portion 8 in the vicinity of the seat stay 36 so as to protrude to the right side of the vehicle body. The upper bearing boss 47 of the rear cushion unit 22 is supported on the upper part of the side surface of the center frame portion 8 by passing through 47 and fastening with the nut 48.
[0021]
This support portion is arranged side by side with the attachment portion of the link 37 with respect to the seat stay 36 in the left-right direction, and as is clear from FIG. 2, the center frame portion 8 is located above the support portion of the attachment shaft 16 of the rear swing arm 15. is arranged to the right side from the right side of the vehicle body so heavy made in a side view (see FIG. 1). As a result, the rear cushion unit 22 is offset from the center of the vehicle body connecting the centers of the center frame 8 and the rear wheel 17 to the right.
[0022]
The mounting position of the seat stay 36 and the rear cushion unit 22 may be in the range from the rear upper part of the backbone frame, that is, the range from the rear part of the main frame 7 to the upper part of the center frame part 8. Further, as is clear from FIG. 5, the center frame portion 8 is arranged along the center of the vehicle body as a single pipe member continuous to the main frame portion 7, but the shape and structure of the square pipe and the pressed product are free. is there.
[0023]
2 and 3, the rear end portion 31a of the exhaust pipe 31 connected to the muffler 32 below the rear swing arm 15 and the front end portion 33a of the tail pipe 33 each form a curved portion. Accordingly, the rear half of the exhaust pipe 31 excluding the rear end 31a and the front half of the tail pipe 33 excluding the front end 33a are linearly arranged on the same line, and are covered by the muffler cover 35. When the muffler cover 35 is made of resin, it is given metallic luster plating or the like to make it appear as if the exhaust pipe 31 is linearly connected to the large-diameter portion 34, giving a sense of unity to the appearance of the exhaust system. ing.
[0024]
As shown in FIG. 3, the muffler 32 has a substantially rectangular box shape that is long in the front-rear direction and has a relatively large capacity. A relief recess 49 is formed on the right side of the muffler 32, and the brake pedal 30 is rotated. It is designed not to interfere.
[0025]
Next, the operation of this embodiment will be described. As described above, the main frame portion 7 and the center frame portion 8 that continuously extend from the head pipe 6 to the lower portion of the vehicle body in the vicinity of the support portion of the rear swing arm 15 along the vehicle body center constitute a backbone frame. On the right side surface of the center frame portion 8, a cushion attachment portion 46 that is an attachment portion of the upper bearing boss 47 of the rear cushion unit 22 and a support portion of the attachment shaft 16 that is a support portion of the rear swing arm 15 are provided side by side. Therefore, the rear cushion unit 22 is offset from the center frame portion 8 and the rear wheel 17 located on the center of the vehicle body in the lateral direction of the vehicle body, that is, to the right side in this embodiment. For this reason, even if the rear cushion unit 22 is brought closer to the rear wheel 17 side, it does not interfere with the rear wheel 17, the wheel base can be shortened, and a compact vehicle body can be obtained.
[0026]
Further, even if the operation seat 13 is attached to the rear upper part of the backbone frame via the seat cushion 14 so as to be able to swing up and down, the seat stay 36 that supports the link 37 that is the seat cushion attachment portion of the operation seat 13 and the rear by tO tHE supporting portion of the cushion unit 22 arranged alongside the cushion mounting portion 46 in the lateral (left-right) direction, and the neighboring cushion mounting portion of the driver seat 13 swings up and down and the rear cushion unit 22 does not interfere It becomes possible to do so.
[0027]
In addition, by detachably connecting the link 37 and the seat stay 36, which are seat cushion mounting portions, the operation seat 13 is swingably supported with respect to the backbone frame and can be removed integrally.
[0028]
FIG. 6 is a diagram corresponding to FIG. 1 relating to another embodiment. In this example, a tandem seat 50 is provided, and a long seat cushion 51 is provided between the rear side bottom portion and the seat stay 36. The seat cushion is supported by the seat stay 36 as in the previous embodiment, and is swingable and detachable in the vertical direction. It has become. The rear end seat of the tandem seat 50 is located above the rear wheel 17, and the rear end extends to the rear side from the center of the rear wheel 17. Instead of the seat cushion 51, the driving seat 50 may be fixedly supported by a pipe member or the like.
[0029]
Further, a tandem step 52 is provided on the left and right of the middle part of the rear swing arm 15 so as to be able to rise and fall so that the passenger can put his / her foot on. Since other structures are the same as in the previous embodiment, common portions are denoted by common reference numerals and description thereof is omitted.
[Brief description of the drawings]
FIG. 1 is a right side view of an entire motorcycle according to an embodiment. FIG. 2 is an oblique rear right perspective view of the entire motorcycle according to an embodiment. Bottom view [Fig. 4] Fig. 5 is a view showing the driving seat mounting portion obliquely from the left rear. [Fig. 5] Fig. 6 is a view showing the opposite side of Fig. 4. [Fig. Explanation】
1: front wheel, 7: main frame, 8: center frame, 11: engine, 12: engine hanger mount stay, 13: driving seat, 14: seat cushion, 15: rear swing arm, 16: mounting shaft, 17: rear Wheel, 22: Rear cushion unit, 30: Brake pedal, 31: Exhaust pipe, 32: Muffler, 33: Tail pipe, 35: Muffler cover, 36: Seat stay

Claims (2)

A swing arm for supporting the rear wheel is swingably provided near the lower end of the rear part of the backbone frame.
In a suspension system for a motorcycle in which a rear cushion unit is disposed between the rear swing arm and the backbone frame,
While arranging the rear part of the backbone frame long in the vertical direction in the center of the vehicle body,
The support portion of the rear cushion unit is arranged above the support portion of the rear swing arm so as to overlap the rear side surface of the backbone frame in the left-right direction in a side view,
Further, the driving seat is attached to the rear upper part of the backbone frame via a seat cushion so that the driving seat can swing up and down, and the seat cushion mounting portion of the driving seat and the support portion of the rear cushion unit are arranged in the left-right direction. A suspension system for a motorcycle characterized by being arranged . Wherein the seat cushion mounting portion, the suspension device of a motorcycle described the driver's seat to claim 1, characterized in that the removable integrally with swingably supported relative to the frame.

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