JPS5878879A - Shock absorber for rear wheel of motorcycle - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] This invention is applicable to motorcycles mainly used for cover riding.
L, 1lItK The purpose is to lower the center of gravity of the vehicle body frame to improve running stability, and to obtain a simple structure that supports a buffer spring directly above the vehicle body frame.

Generally, motorcycles used for road racing must turn while running at high speed, and it is preferable that the allowable tilting angle be as large as possible. Furthermore, in order to improve stability and maneuverability when turning, it is necessary to lower the center of gravity of the #i vehicle as much as possible. For that reason, it is preferable to reduce the height of #i car body frame as much as possible, but if you keep it,
As shown in Japanese Patent No. 2-18827, in some types of motorcycles, the rear 7 oak shock absorbing spring is supported above the engine in the body frame, so if the height of the body frame is lowered, part 11 This makes it difficult to support the buffer spring.

In order to eliminate the above-mentioned problems, the present invention connects the steering shaft pipe and the bracket at the rear of the vehicle body frame with a main pipe member disposed at the rear lower part to form the vehicle body frame, and the lower surface of the main pipe member The engine is suspended in the space formed, and a supporting arm such as a buffer spring is provided protruding from the upper part of one main pipe member.

In the following, the present invention will be explained with reference to the illustrated embodiment 1FIK.

FIG. 1 is a side view of a motorcycle 1 used for road racing. In other words, the bracket in front of the vehicle body frame 2) 2aK
is formed separately and a nine steering shaft tube 3 is attached by bolts 4, and the nine steering shaft tubes 3 are attached to a front fork 6 having a front wheel 5.
is pivoted so that it can be turned left and right. T is a steering handle attached to the front fork 6. A plurality of steel pipes are assembled from the front bracket 21, and a nine main frame member 8 extends rearward and downward, and a rear bracket 2b is fixed to the rear end. The rear part of the engine 9 is fixed to the bracket 2b, and a rear part 11 having a rear wheel 10 is supported by a pivot shaft 111 so as to be able to swing vertically. A drive chain 12 is passed between the two. 14 is an engine cooling water radiator, IS, IS#i exhaust pipe.

A bifurcated arm 1@ is rotatably attached to the upper cross member 8aK of the main frame member 8, and the free end of the arm 16 is connected and fixed to the rear bracket 2b by a fixing rod 17, and a buffer spring The upper ends of 18 are connected. In other words, the fixed rod is a 1T turnbuckle, and one end is screwed to the dial 1F@ with a right-hand thread, and the other end is screwed to the dial 17b with a left-hand thread K, and each India tra 5ITh each pin t
arm 16 and rear bracket 2 by re, 174
It is pivotally connected to b. IT・ is a turnbuckle fixing nut, 1■ is a fuel tank, and 20 is a passenger seat.

The engine ■ is connected from the steering shaft tube 3 to the rear bracket 2bl'
The main frame member 8 is arranged in a substantially triangular space formed between the ground and the main frame member 8 which extends substantially in a straight line toward the rear.

sb is the crank case. H is for both cylinders 90
．． 9 shows the carburetor placed between them.

Next, this practical operation will be explained. When the vehicle travels and the rear wheels pass over unevenness on the road surface, the rear wheels 10 move up and down, and the ll fork 11 swings about the pivot shaft 11m. Since this rocking motion is absorbed by the buffer spring tstc, it is possible to prevent the large impact t11 from being applied to the vehicle body frame 2 via the arm 16.

Additionally, the arm 1sK is connected to the 9 fixed rod IT in the form of a turnbuckle, so that the overall length can be changed. That is, loosen the lock nut 1T, and tighten the rod IT.
When the arm 16 is rotated to extend the rib, the arm 16 rotates counterclockwise, and the initial position of the rear fork 11 is moved upward.
Vehicle height can be lowered.

By shortening the reverse KH and 1T, the vehicle height and minimum ground clearance can be adjusted higher, making it easier to adjust the vehicle settings to suit the weight of the occupants and the size of the unevenness of the road. I can do it.

In this case, the front part of the vehicle body frame 2 is constructed so that it can be divided into the steering shaft tube 3 and the bracket 2m, but this is of course not an essential construction.

As described above, in this invention, an upwardly extending arm is pivotally attached to the upper part of the main frame member, and a buffer spring is installed between it and the fixed rod fork. Therefore, the main frame member of the vehicle body frame is compared. The support part of the buffer spring can be set at any position by the arm. Since the arm can be rotated on the main frame member, the initial length of the buffer spring can be changed freely.

[Brief explanation of drawings]

The drawings show the features of the present invention; FIG. 1 is a side view of the motorcycle, and FIG. 2 is a plan view of the main parts thereof. 2...Vehicle frame, 8...Main frame member, -1...
Cross member, 1@...e arm, 1T...fixed rod, 18th race...buffer spring. Patent applicant Yamaha Motor Co., Ltd. agent Masaki Yamakawa 01 or 1 person)

Claims (1)

[Claims] A front fork having one front wheel is supported on a steering shaft tube located at the front so as to be able to turn left and right, and a rear fork having a rear wheel is supported on a rear bracket so as to be swingable up and down. In a motorcycle having an integral frame in which a tube and a bracket are connected by a main frame member, the main frame member is tilted rearward downward approximately linearly from the steering shaft tube toward the rear bracket, and the main frame member is The engine is suspended on the lower surface, and an arm extending upward is rotatably pivoted on the upper part, and the free end of the arm is fixed by a fixed rod connected to the bracket, while the arm and the rear 7 oak are connected to each other. A rear wheel shock absorber for a motorcycle consisting of a shock absorber spring installed between the