JPS6245924A - Exhaust pipe device of multiple cylinder engine for motor cycle - Google Patents

Abstract

PURPOSE:To facilitate assembling of an exhaust pipe device by composing a connecting pipe for interconnecting a plurality of exhaust pipes of projecting pipes projecting from the respective exhaust pipes and a relay pipe for interconnecting the projecting pipes. CONSTITUTION:An exhaust pipe device 1 includes right and left outside exhaust pipes 2a, 2d interconnected by a first connecting pipe 7 and right and left inside exhaust pipes 2b, 2c interconnected by a second connecting pipe 8. In the above construction, for example the first connecting pipe 7 of the connecting pipes 7, 8 is composed of projecting pipes 10a, 10d projecting from the respective exhaust pipes 2a, 2d and a relay pipe 12 for interconnecting the projecting pipes 10a, 10d. On assembling of the exhaust pipe device 1, at first the exhaust pipes 2a, 2b are separately assembled to the body frame, and then the relay pipe 12 preassembled to one projecting pipe 10a is slided to be connected to the other projecting pipe 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an exhaust pipe device for a multi-cylinder engine for a motorcycle.

(Prior art) In an exhaust pipe device for a motorcycle having a multi-cylinder engine,
Usually, a plurality of exhaust pipes are provided that extend from each cylinder toward the rear of the vehicle body, and the rear end sides of these exhaust pipes are supported by the vehicle body frame.

In the above case, a communication pipe that communicates the exhaust pipes with each other may be installed between these exhaust pipes. This communication pipe functions, for example, as follows. That is, since the exhaust timing of each cylinder generally does not overlap, when one cylinder is in the exhaust timing, the exhaust noise is reduced by the silencer included in the exhaust pipe of that cylinder. At the same time, pressure waves of exhaust gas are guided from this exhaust pipe to the other exhaust pipe through the communication pipe, and the silencer included in this exhaust pipe also reduces exhaust noise. Therefore, the communication pipe allows exhaust noise from one cylinder to be reduced by a plurality of silencers.

In the above configuration, the communicating pipe has a pair of protruding pipes that protrude from one exhaust pipe to the other exhaust pipe, and the protruding ends of the corresponding protruding pipes form an inner and outer double pipe. There are things that fit into each other.

(Problem to be Solved by the Invention) By the way, the above-mentioned communication pipe is composed of a pair of protruding pipes whose protruding ends are fitted into each other. Assembling the parts by fitting them together is impossible or difficult.

Therefore, conventionally, a plurality of exhaust pipes and communication pipes are assembled together and then assembled as one body onto the vehicle body frame.

However, since such an assembly of a plurality of exhaust pipes and communication pipes is heavy, it is extremely complicated to assemble it into a single piece on the vehicle body frame.

Furthermore, in the above case, the assembly of the exhaust pipe and the communication pipe is bulky, and it is difficult to mold it with high precision. Therefore, dimensional errors are likely to occur between the vehicle body frame side and the "-" type assembly, and therefore, in this respect as well, assembly to the vehicle body frame side is complicated.

(Objective of the Invention) This invention was made with attention to the double-duty situation, and its purpose is to facilitate the assembly of exhaust pipes and communication pipes to the vehicle body frame. .

(Structure of the Invention) The present invention for achieving the above object is characterized by a protruding pipe that protrudes from one exhaust pipe toward the other exhaust pipe, and one end of the protruding pipe extending axially toward the protruding pipe. The relay pipe is movably fitted and is detachably connected to the other end of the exhaust pipe.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment.

1 and 2, 1 is an exhaust pipe device installed in a parallel four-cylinder engine of a motorcycle, and the reference numeral Fr in the figure is Fr.
indicates the front of the vehicle. Further, 2a to 2d are exhaust pipes in this exhaust pipe device 1, and the reference numeral 2a is
~2d is the exhaust pipe installed on the left side of the vehicle body toward the right side. Each of these exhaust pipes 2a to 2d has a front end connected to an exhaust boat of each cylinder, and a rear end extending toward the rear of the vehicle body.

Among the exhaust pipes, the rear ends of the two inner exhaust pipes 2b and 2c are connected to the front and rear midpoints of the left and right outer exhaust pipes 2a and 2d. Further, each of the outer exhaust pipes 2a and 2d has a silencer 3 at its rear end, and each silencer 3 is screwed to a bracket 5 projecting from the vehicle body frame 4 by a port 6.

The left and right outer exhaust pipes 2a and 2d have first
A communication pipe 7 is constructed. This first communication pipe 7 allows the two Exis I pipes 2a, 2d to communicate with each other. Also, a second communication pipe 8 is installed on both the inner exhaust pipes 2b and 2c, and this second communication pipe 8 has the same structure as the double first communication pipe 7, and is connected to both the exhaust pipes 2b and 2c.
, 2c are communicated with each other.

3 and 4, the double first communication pipe 7 will be explained.

Projecting pipes 10a and 10d are provided to protrude from the left outer exhaust pipe 2a and the right outer exhaust pipe 2d, respectively. Both of these protruding pipes 10a and 10d are made to protrude from one exhaust pipe toward the other exhaust pipe. Each of these protruding tubes 10a, lo
The protruding ends d are each formed to have a large diameter dimension, forming a large diameter portion 11.

Further, a relay pipe 12 is provided that connects both the projecting pipes 10a and 10d. That is, each end of this relay pipe 12 is fitted into each large diameter portion 11 of both projecting pipes 10a and 10d. An annular gasket 13 made of asbestos is fitted between the inner circumferential surface of each of the large diameter portions 11 and the outer circumferential surface of each end of the relay pipe 12, and the band I4 fitted onto the large diameter portion 11 is fastened. As a result, the ends of each large diameter portion 11, gasket 13, and relay pipe 12 are fastened to each other.

Furthermore, when the band 14 is loosened, the relay pipe 12 is allowed to slide freely in the axial direction relative to the gasket 13. For example, when each band 14 is loosened and the relay pipe 12 is pushed toward the left outer protruding pipe 10a as shown by the two-dot chain line in FIGS. 1 and 3, the protruding ends of the right outer protruding pipe 10d The face and
A gap is formed between the end face of the relay pipe 12 and the end face of the relay pipe 12.

The second communication pipe 8 has the same configuration as the first communication pipe 7, and includes projecting pipes 10b and 10c that project from the two inner exhaust vibes 2b and 2c, and a relay pipe 12' that communicates these projecting pipes vlOb and 10c. have.

Therefore, when assembling the type 2 exhaust pipe device 1 to the side of the vehicle body frame 4 including the cylinders, first loosen each band 14 and connect each relay pipe 12, 12' to the left protruding pipe 10a.
, push it into the 10b side. Next, the left exhaust pipes 2a and 2b are assembled to the vehicle body frame 4 together with the respective relay pipes 12 and 12'. On the other hand, assemble the right side exhaust pipes 2c and 2d to the vehicle body frame 4 side in the same way as the 2nd type.

In this case, since there is a gap 1711 between the protruding end surfaces of the respective relay pipes 12 and 12' and the end surfaces of the protruding pipes 10c and 10d protruding from the right exhaust pipes 2c and 2d, these may interfere with each other. Conflicts are avoided. After each exhaust pipe 2a to 2d is individually assembled to the vehicle body frame 4 side, each relay pipe 12, 12' is slid and its protruding end is connected to the right protruding pipe 10c, 10d, respectively.
If the band 14 is fitted into the protruding end of the band 14 and the band 14 is fastened,
The operation of assembling the exhaust pipe device 1 is completed.

In addition, when assembling the exhaust pipe device 1 to the vehicle body frame 4 side, each relay pipe 12, 12' may be pushed into the protruding pipes 10c, 10d of the right exhaust pipes 2c, 2d.

Further, in the above case, when positioning each relay pipe 12.12' with respect to the protruding pipes 10a to 10d before finally fastening the relay pipe 12.12', this positioning is performed by the right exhaust pipe 2c. , 2d protruding tube 10
This is done by matching the positioning plate 16 welded in advance to the outer surface of the relay pipe 12.12' with the protruding end face of the pipes c and 10d.

Each of the following figures shows another embodiment, and the configurations different from the above embodiment will be explained, and the common configurations will be denoted by reference numerals in the drawings and their explanation will be omitted.

FIG. 5 shows a second embodiment. In the figure, instead of the protruding ends of each of the protruding pipes 10a and 10d being large-diameter parts, both ends of the relay pipe 12 are made into large-diameter parts 11.11. Each of the large-diameter portions 11 is fitted onto the protruding ends of the protruding tubes 10a and 10d. In addition, in this case, the positioning plate 16
is welded to the outer surface of the protruding tube 10d.

FIG. 6 shows a third embodiment. In the figure, instead of the protruding end of the protruding pipe 10a of the left outer exhaust pipe 2a being the large diameter part, the end of the relay pipe 12 is the large diameter part 11. This large diameter portion 11 is externally fitted onto the end of the protrusion w10a.

Note that although the following is based on the illustrated example, the corresponding exhaust pipes may be arranged one above the other. Further, the other end of the relay pipe 12, one end of which is fitted to the protruding pipe of one exhaust pipe, may be detachably connected to the other exhaust pipe by a flange.

(Effects of the Invention) According to the present invention, the communication pipe has a protruding pipe that protrudes from one exhaust pipe toward the other exhaust pipe, and one end of the communicating pipe is fitted into the protruding pipe so as to be movable in the axial direction. Since it is constructed with a relay pipe that is detachably connected to the other exhaust pipe, the exhaust pipe device can be assembled on the vehicle body frame side, for example, as follows. That is, you can first assemble the relay pipe to one of the exhaust pipes and then assemble them to the vehicle body frame. On the other hand, the other exhaust pipe is separately assembled to the vehicle body frame side. next,
Slide the relay pipe to connect its protruding end to the other exhaust pipe of type 2.

Therefore, when a plurality of exhaust pipes, each of which is relatively heavy, are to be assembled to the vehicle body frame, they can be assembled individually. Compared to the case where the parts were assembled as one piece on the vehicle body frame side, this assembly process is easier.

In addition, since the relay pipe is slidably attached to the protruding pipe, even if there is some dimensional error on the body frame side or between both exhaust pipes, this can be absorbed.
In this respect as well, the work of assembling these onto the vehicle body frame becomes easy.

[Brief explanation of the drawing]

The figure shows an embodiment of this invention, and Figures 1 to 4 show the first embodiment of the invention.
In the example, Fig. 1 is an overall plan view, Fig. 2 is a side view,
Figure 3 is a partial enlarged sectional view of Figure 1, Figure 4 is the T of Figure 3.
5 is a view corresponding to FIG. 3 in the second embodiment, and FIG. 6 is a view corresponding to FIG. 3 in the third embodiment. 1. Exhaust pipe device, 2a to 2d... Exhaust pipe, 4. Vehicle body frame, 7. - 1st communication pipe, 8. φ 2nd.
Communication pipe, 10a to 10d... Projection pipe, 12.12'
・Life relay tube.

Claims (1)

[Claims] 1. A multi-cylinder motorcycle for motorcycles in which a plurality of exhaust pipes are provided, one end of which is connected to each cylinder, and the other end of which is supported by the vehicle body frame, and a communication pipe is installed between these exhaust pipes to communicate with each other. In an engine exhaust pipe device, the above-mentioned communication pipe is connected to a projecting pipe that projects from one exhaust pipe to the other exhaust pipe, and one end side is fitted into the projecting pipe so as to be movable in the axial direction, and the other end side is connected to the other exhaust pipe. An exhaust pipe device for a multi-cylinder engine for a motorcycle, characterized by comprising a relay pipe detachably connected to a pipe.