JPH0788192B2 - Exhaust pipe arrangement structure for motorcycles - Google Patents

Description

The present invention relates to an exhaust pipe arrangement structure for a motorcycle.

(Prior art and its problems) While mounting the front and rear V-type engines in the approximate center of the vehicle body,
The rear fork that supports the rear wheel is a cantilever type that is formed by the base end part of the rear fork pivotally supported by the vehicle body and one side arm that is connected to the rear part of the rear fork, and the exhaust pipe of the rear cylinder is the base end of the rear fork. A motorcycle having an arrangement structure that passes through the inside of the portion is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-105589. In the exhaust pipe arrangement structure according to this conventional technique, the exhaust pipe of the rear cylinder passes through the inside of the rear fork, which causes a problem of increasing the number of assembling steps.

(Object of the Invention) The present invention has been made to solve the above problems, and an object of the present invention is to provide an exhaust pipe arrangement structure for a motorcycle in which the number of assembling steps is reduced and the workability at the time of assembling is improved. To aim.

(Summary of the Invention) In order to achieve the above object, according to the present invention, an engine is mounted substantially in the center of a vehicle body, and a rear fork supporting a rear wheel is provided with a rear fork base end portion pivotally supported by the vehicle body. ,
In an exhaust pipe arrangement structure for a cantilevered motorcycle, which is formed by a one-sided arm connected to a rear portion of the rear pipe, the exhaust pipe of the engine has a rear fork base end portion at a position opposite to the arm and a rear wheel. It is characterized by passing through a space formed between and in front of the rear wheel.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front / rear V which employs an exhaust pipe arrangement structure according to the present invention.
The side view of a motorcycle equipped with a multi-cylinder engine
The motorcycle 1 has a pair of left and right main frames 2 formed of a tubular body having a large vertical width and a rectangular cross section. The main frame 2 has a head pipe 3 at its tip and a left and right head pipe 3 at its rear end.
The pair of pivot plates 4 are welded to each other, the seat rail 5 is joined to the upper surface of the rear portion, and the engine hanger 6 is provided at the center of the lower portion.

The head pipe 3 is provided with a front fork 8 that supports the front wheels 7, and a handle bar 9 allows steering to the left and right.

The pivot plate 4 engages a seat gusset plate 10 integrally provided on the upper end thereof with the seat rail 5 to support the seat rail 5 via the plate 10, and at the lower portion thereof, a front end (base) of a rear fork 11 is provided. The end part) is swingably supported around the lower part in the vertical direction. The rear fork 11
A rear wheel 12 is supported on the other end of the rear fork 11 and a rear suspension device 13 between the rear fork 11 and the seat gusset plate 10.
Is installed. The rear fork 11 is a cantilevered rear fork, and as shown in FIGS. 1 to 3, has one arm 11a extending rearward on one side of the vehicle body and supporting a rear wheel 12 at a rear end thereof. A front end of 11a, that is, a rear fork base end portion 11b is pivotally supported by a pivot bearing 11c at approximately the center of a portion bridging the lower portions of the left and right pivot plates 4 with each other. As shown in FIGS. 2 and 3, the base end portion 11b of the rear fork 11 has a center line of the vehicle body connecting the centers of the front and rear wheels.
An insertion hole 11d is vertically formed at a position slightly deviated from CL toward the arm 11a. Providing this insertion hole 11d at the offset position instead of the center position of the rear fork base end portion 11b allows the base end portion 11b of the rear fork 11 to be inserted.
It is possible to increase the width dimension of the edging portion 11f between the end 11e on the side opposite to the arm 11a and the insertion hole 11d, and the rigidity of the base end portion 11b can be improved.

The upper end 13a (FIG. 2) of the rear suspension device 13 is pivotally supported by the seat gusset plate 10, and the other end of a rod 13c, one end of which is fixed to the lower end 13b, is the other end of the rear fork 11.
The insertion hole 11d is loosely fitted and is pivotally supported by a bracket 11h fixed to the lower end surface of the arm 11a of the rear fork 11 via a pivot 13d and a link 11g.

A fuel tank 14 is mounted on the front portions of the upper portions of the main frame 2 and the seat rail 5, and a seat (not shown) is provided behind the fuel tank 14.

An engine 15 is arranged below the fuel tank 14,
The engine 15 is supported by the engine hanger 6 and the pivot plate 4, and a radiator 16 is arranged in front of the engine 15.

The engine 12 is a front-rear V-type four-cylinder engine having front cylinders 17 and 18 arranged on the front side of the vehicle body and rear cylinders 19 and 20 arranged on the rear side of the vehicle body. The exhaust pipes 21 and 22 are connected to 18 and the exhaust pipes 23 and 24 are connected to the cylinders 19 and 20 on the rear side of the vehicle body, respectively.

The exhaust pipes 21 and 22 extend from the front of the engine 15 to the rear of the vehicle body below the engine 15 to the rear of the vehicle body and the rear fork.
11 arcs 11a side is combined into one.

The exhaust pipes 23, 24 hang down from the rear of the engine 15 close to the side end 11e of the rear end 11b of the rear fork 11 on the side opposite to the arm 11a, and the rear fork 11 formed by displacing the suspension to the left side. At the right paddle reduction portion, the left muffler 25 and the left muffler 25 are crossed with each other so as to have the same length and are bent into a substantially U shape, respectively, and pass through below the base end portion 11b of the rear fork 11 and the arm 11a side vehicle body. It extends to the rear and is integrated into one at the rear of the vehicle body, and is further combined with the exhaust pipes 21 and 22 combined into one and connected to a muffler 25.

According to this embodiment, as described above, the exhaust pipes 23 and 24 of the rear cylinder of the front and rear V-type engine are connected to the arms of the rear fork base end portion 11b.
A space formed between the rear wheel 12 and a portion at a lateral position opposite to 11a and a space formed in front of the rear wheel is bent into a substantially U shape and is passed therethrough, and is further passed below the rear fork base end portion 11b. By arranging the rear wheels, the rear wheel does not interfere with the exhaust pipe when it is attached or detached, and workability is excellent. Since the number of man-hours attached is reduced, the workability of the subscript is further improved.

As described above, according to the present invention, the engine is mounted substantially in the center of the vehicle body, the rear fork supporting the rear wheels, the rear fork base end portion pivotally supported by the vehicle body, and the rear fork. In an exhaust pipe arrangement structure for a cantilevered motorcycle, which is formed by a one-sided arm connected to a rear portion, a portion of the exhaust pipe of the engine at a position opposite to the arm of the rear fork base end portion and a rear wheel. Since it passes through the space formed between the front and rear wheels, the cantilevered rear fork structure provides superior workability when attaching and detaching the rear wheels as compared to a normal two-arm rear fork. As compared with the structure in which the exhaust pipe is attached to the inside of the rear fork, the number of assembling steps is reduced, and thus the workability at the time of assembling is further improved.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle to which a rear fork according to the present invention is applied, FIG. 2 is a partial sectional view showing an outline of a main part of FIG. 1, and FIG. 3 is an engine and an exhaust pipe of FIG. FIG. 6 is a plan view showing an arrangement state of a rear frame, a rod of a rear suspension device, a rear wheel, and the like. 11 …… Rear fork, 11d …… Insertion hole, 15 …… Engine, 19,20 …… Rear cylinder, 23,24 …… Exhaust pipe.

Claims (1)

[Claims] 1. A piece formed by mounting an engine substantially in the center of a vehicle body and having a rear fork supporting a rear wheel, the rear fork base end portion pivotally supported by the vehicle body, and one side arm connected to the rear portion. In an exhaust pipe arranging structure for a motorcycle, the exhaust pipe of the engine is formed between a rear wheel and a portion of the rear fork base end opposite to the arm and in front of the rear wheel. An exhaust pipe arrangement structure for motorcycles that is characterized by passing through a space.