JPH0579807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piping structure of an exhaust pipe for a motorcycle engine.

[Conventional technology]

In motorcycles equipped with multi-cylinder engines, the lengths of the exhaust pipes connected to each cylinder are synchronized as a means to improve the output characteristics of the engine.

For this reason, in a motorcycle equipped with a longitudinal V-type multi-cylinder engine, if each exhaust pipe extends from the front of the engine to the bottom of the engine and to the rear of the vehicle body, the cylinders located at the front side of the vehicle body The exhaust pipe connected to the cylinder has more bends than the exhaust pipe connected to the cylinder located at the rear of the vehicle body, so that the lengths of both exhaust pipes are synchronized.

[Problem that the invention seeks to solve]

However, due to the arrangement of the engine, suspension, etc., the location of the bent portion of the exhaust pipe is limited, and it has been desired to efficiently install piping in a limited space.

Therefore, an object of the present invention is to provide a structure for efficiently piping an exhaust pipe.

[Means for solving problems]

In order to achieve the above object, the present invention provides a motorcycle equipped with a vertical V-type multi-cylinder engine, in which an exhaust pipe connected to each cylinder extends from the front of the engine to the rear of the vehicle body through the bottom of the engine. An exhaust pipe connected to a cylinder located on the front side of the vehicle body is bent in the width direction of the vehicle body below the engine to form a bent part, and the exhaust pipe is connected to a cylinder located on the rear side of the vehicle body below the bent part. It is characterized by having a.

[Effect]

With this configuration, the exhaust pipes can be arranged efficiently and the lengths of the exhaust pipes can be synchronized.

〔Example〕

An embodiment of the present invention will be described based on the drawings.

The motorcycle 1 has a symmetrical main frame 2 formed of a cylindrical body with a rectangular cross section and a large vertical width, and the main frame 2 has a head pipe 3 at its tip.
A pivot plate 4 is welded to each rear end, a seat rail 5 is joined to the upper surface of the rear part, and an engine hanger 6 is provided at the center of the lower part.

The head pipe 3 is provided with a front fork 8 that supports a front wheel 7, and can be steered left and right by a handlebar 9.

The pivot plate 4 supports the seat rail 5 by connecting a seat gusset plate 10 integrally provided at its upper end to the seat rail 5, and supports a rear fork 11 at its lower part so as to be rotatable in the vertical direction. A rear wheel 12 is supported by a rear fork 11,
Rear fork 11 and seat gusset plate 10
A rear suspension device 13 is provided between the two.

A fuel tank 14 is mounted on the upper front part of the main frame 2 and the seat rail 5, and a seat is provided behind the fuel tank 14.

An engine 15 is installed in the engine hanger 6 and is supported by the engine hanger 6 and the pivot plate 4. A radiator 1 is installed in front of the engine 15.
6 are arranged.

The engine 15 is a vertical V-type two-cylinder engine, and exhaust pipes 19 and 20 are connected to a cylinder 17 on the front side of the vehicle body and a cylinder 18 on the rear side of the vehicle body, respectively.

The exhaust pipe 19 has one end 19a connected to the cylinder 17 on the front side of the vehicle body.
The central part is bent in the vehicle width direction below the engine 15 to form a toggle-shaped bent part 19b that rotates 360 degrees and extends to the rear of the vehicle body, and the other end 19c
is connected to muffler 21.

Exhaust pipe 20 connected to the rear cylinder 18 of the vehicle body
extends from the front of the engine 15 to below the engine 15, is disposed below the bent portion 19b of the exhaust pipe 19, extends to the rear of the vehicle body, and is connected to the muffler 22.

Further, in order to reduce air resistance during running, a cowling 23 is provided integrally extending from the front of the handlebar 9 to both sides of the vehicle body.
The under cowl part 23a of the cowling 23, which covers the lower part of the engine 15, has deep bank angles 23b, 23b formed on both left and right sides so that there is no problem even if the vehicle body is tilted when driving on a curved road.
The bent portion 19b of the exhaust pipe 19 and the exhaust pipe 20 disposed below the bent portion 19b are connected to the under cowl portion 2.
It is stored in 3a.

Exhaust pipes 19 and 20 are connected to the front cylinder 17 and the rear cylinder 18, respectively.
Since the piping is installed, a deep bank angle can be ensured, resulting in an efficient piping structure, and a low center of gravity and mass concentration can be achieved.

The main frame 2 may have one or more partition walls formed in the longitudinal direction and have a cross-section shaped like an "eye" or a "h" shape.

〔Effect of the invention〕

As described above, the present invention relates to a motorcycle equipped with a vertical V-type multi-cylinder engine and having an exhaust pipe connected to each cylinder extending from the front of the engine to the rear of the vehicle body through the lower part of the engine. An exhaust pipe connected to a cylinder located at the rear of the vehicle is bent in the vehicle width direction below the engine to form a bent part, and an exhaust pipe connected to a cylinder located at the rear of the vehicle is arranged below the bent part. Therefore, an efficient exhaust pipe piping structure can be achieved, and a low center of gravity and mass concentration can be achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a plan view, and Fig. 3 is the same as Fig. 1.
FIG. 1...Motorcycle, 15...Engine, 17...
...Cylinder on the front side of the vehicle body, 18...Cylinder on the rear side of the vehicle body, 1
9, 20... Exhaust pipe, 19b... Bent part.

Claims (1)

[Claims] 1. In a motorcycle equipped with a vertical V-type multi-cylinder engine, in which the exhaust pipes connected to each cylinder extend from the front of the engine, below the engine, and to the rear of the vehicle body, the exhaust pipes connected to the cylinders located at the front side of the vehicle body An automatic vehicle characterized in that an exhaust pipe is bent in the vehicle width direction below the engine to form a bent part, and an exhaust pipe connected to a cylinder arranged on the rear side of the vehicle is arranged below the bent part. Piping structure of exhaust pipe of motorcycle engine.