JPS6387389A - Support structure of shock absorber for car - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applied to a vehicle in which a rear arm, which has a rear wheel attached to its rear end and is swingable up and down, is supported by a single cylindrical shock absorber. This invention relates to a shock absorber support structure.

(Background of the invention) For vehicles such as motorcycles and 3.4-wheel vehicles for traveling on rough terrain, a rear arm that can swing up and down and a rear wheel is attached to the rear end is used.
There is one that is supported by a cylindrical shock absorber made of books. In this case, conventionally, the upper end of the shock absorber was usually supported near the rear end of the main tube of the vehicle body frame, and the entire shock absorber was disposed diagonally. For this reason, the buffer is located close to the air cleaner, which is generally disposed continuously near the rear of the carburetor, making it difficult to increase the capacity. Therefore, a structure was proposed in which the air cleaner is disposed behind the shock absorber and the air cleaner and the carburetor are connected by a passage that bypasses the side of the shock absorber (Utility Model Application No. 56-47373). However, in this case, the carburetor and the air cleaner are separated by a large distance, which may lead to a decrease in intake efficiency.

In addition, the length and expansion/contraction space of the shock absorber are limited depending on its location, and it is required that its agility not be sacrificed.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and is an object of the present invention to provide a vehicle in which the capacity of the air cleaner can be increased without reducing the intake efficiency, and there is no risk of sacrificing the function of the shock absorber. The purpose is to provide a shock absorber support structure.

(Structure of the Invention) According to the present invention, the object is to provide a vertically swingable rear arm whose front end is pivoted to the vehicle body frame and whose rear end is attached to a rear wheel, and which is disposed near the center in the width direction of the vehicle body. In a vehicle supported by a single cylindrical shock absorber, an air cleaner is disposed at the front between a pair of left and right seat rails, and the shock absorber is disposed behind this air cleaner, and the upper end of this shock absorber is disposed at the front between a pair of left and right seat rails. This is achieved by a shock absorber support structure for a vehicle, characterized in that a support member extending over the pair of left and right seat rails is supported by a pin located above the seat rails.

(Example) Fig. 1 is a side view of a motorcycle for traveling on rough terrain which is an embodiment of the present invention, Fig. 2 is a plan view of a part thereof, and Fig. 3 is a side view of the vehicle body frame. Figure 4 shows IV-IV in Figure 1.
FIG.

In these figures, reference numeral 10 denotes a diamond-shaped vehicle body frame, which includes a steering shaft tube 12, a main tube 14 and a down tube 16 extending diagonally downward and rearward from the steering shaft tube 12, and a down tube 16 extending diagonally downward from the rear end of the main tube 14. A pair of left and right vertical tubes 18 (18a, 18b) extending downward and rearward.
, FIG. 4), and a pair of left and right seat rails 20 (20a, 20b, second
) and a pair of left and right back tubes 22 that extend diagonally upward and backward from the bottom of the standing tube 18 and support the seat rail 20.
(only one is shown).

A rearwardly open bracket 24 is fixed near the front end between the pair of left and right seat rails 20. Further, the seat rail 20 and the back tube 22 are fixed to each other by reinforcing brackets 26 (26a, 26b, see FIG. 2). In the vicinity of this reinforcing bracket 26, the two seat rails 20 are fixed to each other by two cross members 28,30. A pair of left and right brackets 32 (32a, 32b) are fixed to both cross members 28, 30 so as to oppose each other, and both brackets 32 protrude upward from the upper surface of the seat rail 20.

Note that a tray 36 for mounting a battery 34 is located behind the rear cross member 30. This Toshinoi 36
is fixed to the cross member 30 and the back tube 22.

In FIG. 1, 38 is a front fork, 40 is a front wheel equipped with wide tires, 42 is a steering handlebar, 44 is a fuel tank installed so as to straddle the main tube 14, and 46 is behind this fuel tank 44. It is a straddle-type seat that is long in the front and back direction.

50 is an engine, which is mounted so as to connect the lower end of the down tube 16 and the lower end of the upright tube 18. 52 is an exhaust pipe that extends rearward from the front of the down tube through the right side of the cylinder 50a of the engine 50;
It is connected to the exhaust muffler 54.

A carburetor 56 is located near the center in the vehicle width direction behind the cylinder 50a (see FIG. 2).

Reference numeral 58 denotes an air cleaner, which occupies the vicinity of the front part of a triangular space in side view surrounded by the seat rail 20, the upright tube 18, and the back tube 22. The air intake port 58a of the air cleaner 58 opens at the front between the seat rails 20, that is, between the bracket 24 and the cross member 28 (FIG. 2).

60 is a rear arm, the front part of which is held by a pivot shaft 64 on a pivot bracket 62 fixed to the vertical tube 18, as shown in FIG. The rear part of this rear arm 60 is divided into two forks, and a rear wheel 66 equipped with a wide tire is attached between the two forks. An intermediate shaft 68 in the vehicle width direction is rotatably attached to the front portion of the rear arm 60, that is, to the rear of the pivot shaft 64. Sprockets 68a and 68b are fixed to the inner and outer ends of the intermediate shaft 68, respectively.

The rotational output of the engine 50 is transmitted to the inner end sprocket 68a by the chain 7o, and the intermediate shaft 68
The rotation of the subblock 68b at the outer end of the rear wheel 68 is further transmitted to the rear wheel 66 by a chain 72.

Reference numeral 74 denotes a cylindrical shock absorber that integrates a coil spring and a damper, and is located behind the air cleaner 58 and near the center in the width direction of the vehicle body. The lower end of this shock absorber 74 on the cylinder side is connected to a pin 76 on a bracket 76 protruding from the rear arm 60.
8 (Fig. 4). The upper end of the shock absorber 74 on the piston rod side is pivotally supported by a pin 80 between brackets 32a and 32b fixed to the cross member 28, 30. This pin 80 is located above the seat rail 20, as seen in FIG.

According to this embodiment, if the rear arm 60 swings up and down about the pivot shaft 64 as the rear wheel 66 moves up and down,
The buffer 74 expands and contracts. Since the upper end of the shock absorber 74 is pivotally supported by a pin 80 above the seat rail 20, the shock absorber 74
It is possible to increase the overall length of the shock absorber 74 and increase the stroke of the shock absorber 74. As a result, a sufficiently large vertical movement range of the rear wheel 66 can be ensured without sacrificing the function of the shock absorber 74. Further, since the pin 80 is located above the seat rail 20, the pin 80 and tools do not interfere with the seat rail 20 when the pin 80 is attached or removed, resulting in good workability.

According to this embodiment, if the rear wheel 66 is made of a wide low-pressure tire (for example, a balloon tire), the shock absorption capacity of the tire itself is large, so the shock applied to the shock absorber is reduced, and the shock at the upper end of the shock absorber is also reduced. . Therefore, even if the upper end of the shock absorber is supported on the seat rail, no excessive load is applied to the seat rail.

(Effects of the Invention) As described above, the present invention provides a support member in which an air cleaner is disposed in the front part between a pair of left and right seat rails, a buffer is disposed behind the air cleaner, and the upper end of the buffer is extended over both seat rails. Since it is supported by pins, it is possible to increase the capacity of the air cleaner located in front of it. In addition, since the pin that supports the upper end of the shock absorber is located above the seat rail, the overall length of the shock absorber can be increased, and its vertical movement range can also be widened, without sacrificing the function of the shock absorber. Nor.

[Brief explanation of the drawing]

Fig. 1 is a side view of a two-wheeled motor vehicle for traveling on rough terrain which is an embodiment of the present invention, Fig. 2 is a plan view of a part thereof, Fig. 3 is a side view of the vehicle body frame, and Fig. 4 is a side view of a motorcycle for traveling on rough terrain. IV-IV in Figure 1
FIG. DESCRIPTION OF SYMBOLS 10... Vehicle body frame, 20... Seat rail, 28.30... Cross member as a support member, 32
...Bracket as a support member, 56...Air cleaner, 60...Rear arm, 74...Buffer, 80...Pin.

Claims (1)

[Scope of Claims] A single cylindrical shock absorber having a vertically swingable rear arm whose front end is pivoted to the vehicle body frame and whose rear end has a rear wheel attached, and which is disposed near the center in the width direction of the vehicle body. In a vehicle that is supported by a vehicle, an air cleaner is disposed at the front between the pair of left and right seat rails, and the shock absorber is disposed behind the air cleaner, and the upper end of the shock absorber is extended over the pair of left and right seat rails. A shock absorber support structure for a vehicle, characterized in that the support member is supported by a pin located above the seat rail.