JPH041410A - Exhaust silencer for vehicle - Google Patents

Abstract

PURPOSE:To prevention outer tube from temperature rising and the surface thereof from staining by providing an inner tube, an outer tube and a combined duct and spacer disposed between these tubes and provided with a vent hole to make travelling wind flow between the inner and outer tubes. CONSTITUTION:An exhaust silencer 22(23) has a second inner tube 28 fixed to the outer periphery of a first inner tube 27 through a partition wall member 30 and a lid body 31 fixed to the front end of the first inner tube. The left half of the first inner tube 27 has a partition member 32 fixedly inserted therein and baffle parts 33 cut in the outer periphery thereof to form an exhaust flow path. The right half of the first inner tube 27 has an exhaust pipe 35 fixed thereto through a fixing member 34 to provide a sound absorbing material 36 between these members. A second inner tube 28 has combined duct and spacer members 40, 41 fixed to the outer periphery thereof and formed with a plurality of vent holes 40a, 41a. On the other hand, the lid body 31 is connected to a connecting member 46 fixed to the rear end of a muffler 20(21) through bolts 47.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust muffler for vehicles such as motorcycles.

C. Conventional technology] Conventionally, in exhaust silencers for motorcycles, etc., the outer cylinder of the silencer becomes hot due to the heat of exhaust gas, so a heat insulating material such as glass fiber is wrapped between the expansion chamber and the outer cylinder. ing.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional silencer, the outer cylinder of the silencer becomes hot due to the heat of the exhaust gas, so it is difficult to use carbon fiber, ceramic fiber, etc. applied to the outer surface of the silencer. There is a risk of burning or discoloring fiber-reinforced plastic, decorative plating, paint, etc., and in order to lower the temperature of the outer cylinder, the thickness of the insulation material must be ensured accordingly.
There is a problem in that as the device becomes larger, the cost also increases.

Furthermore, the tar-like exhaust oil discharged from the gas outlet flows down the surface of the outer cylinder of the muffler, resulting in the problem that the surface of the outer cylinder is contaminated.

The present invention solves the above problems, and provides a vehicle exhaust muffler that can prevent the outer cylinder of the muffler from becoming high temperature due to the heat of exhaust gas, and can also prevent the outer cylinder surface from becoming dirty. The purpose is to provide.

[Means for Solving the Problems] To this end, the vehicle exhaust muffler of the present invention is a vehicle equipped with an exhaust muffler 22 that is arranged so as to be inclined with the gas discharge port facing upward. , an inner cylinder 28, an outer cylinder 29, and a ventilation spacer 40.41 arranged between these inner cylinder and outer cylinder and in which a ventilation hole 40a141a is formed, and between the inner cylinder and outer cylinder. It is characterized by allowing air to flow through the vehicle.

Note that the numbers added to the above configurations are for comparison with the drawings, and the configurations of the present invention are not limited thereby.

[Function] In the present invention, for example, as shown in FIG. 1, the running wind is transmitted through the gap between the front cover 42 and the lid body 31 and the ventilation spacer 40, 41 as shown by the dotted chain line arrow. Hole 40as41a, rear cover 43 and exhaust outlet pipe 39
Since the water flows through the gap, the outer cylinder 29 is effectively cooled.

[Embodiment] Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. Fig. 3 shows an overall side view of a motorcycle according to the present invention. A body frame 2 of a motorcycle 1 includes a head pipe 3, an upper frame, 4. It consists of a lower frame 5, a seat rail 6, a rear arm bracket 7, etc. A front fork 9 is rotatably supported by the head pipe 3, and a front wheel 10 is attached to the lower part of the front fork 9. Further, an engine 11 is mounted and fixed between the upper frame 4 and the lower frame 5, and a fuel tank 12 and a seat 13 are arranged above the upper frame 4 and the seat rail 6.

A rear arm 15 is swingably supported on the rear arm bracket 7, a rear wheel 16 is rotatably attached to the rear arm 15, and a shock absorber 17 is disposed between the rear arm 15 and the upper frame 4. There is. The exhaust pipe 19 from the engine 11 passes through the lower part of the vehicle body to the muffler 20.2.
1 and further extends to the rear to connect to the exhaust silencer 22.23.
It is connected to the. These exhaust silencers 22 and 23 are mounted on mounting bands 25 and 25 so that they are inclined with the waste discharge port facing upward.
is fixed to the footrest mounting bracket 26.

FIG. 1 is a sectional view showing one embodiment of the vehicle exhaust muffler of the present invention, and FIG. 2 is a perspective view of the ventilation spacer in FIG. 1.

The exhaust silencer 22 (23) has first and second inner cylinders 27, 28 and an outer cylinder 29, and the outer cylinder 29 is wrapped with fiber-reinforced plastic such as carbon fiber or ceramic fiber.

A second inner cylinder 28 is fixed to the outer periphery of the first inner cylinder 27 via a partition member 30, and a lid 3 is fixed to the front end of the first inner cylinder 27.
1 is fixed. A partition member 32 is inserted and fixed into the left half of the first inner cylinder 27, and a cut-and-raised piece 33 is cut and raised on the outer periphery of the first inner cylinder 27, and the cut-and-raised piece 33 comes into contact with the partition member 32. They are fixed in contact with each other, thereby forming an exhaust flow path as indicated by the arrow in the figure.

An exhaust pipe 35 is fixed to the right half of the first inner cylinder 27 via a fixing member 34, and a sound absorbing material 36 such as glass fiber is provided between the first inner cylinder 27 and the exhaust pipe 35. 1st
A large number of ventilation holes (not shown) are formed in the portion where the fi 27 and the exhaust pipe 35 contact the sound absorbing material 36, and
A compartment 37 is formed between the first and second inner cylinders 27, 28, and these structures absorb exhaust noise. Further, an exhaust outlet pipe 39 is connected and fixed to the exhaust pipe 35 .

A ventilation spacer 40.4 is provided on the outer periphery of the second inner cylinder 28.
1 is fixed, and the outer cylinder 29, front cover 42, and rear cover 43 are fixed to the second inner cylinder 28 by rivets 45. The front cover 42 and the rear cover 43 are spaced apart from the lid 31 and the exhaust outlet pipe 39, respectively, and form a ventilation path. Further, as shown in FIG. 2, a plurality of ventilation holes 40a141a are formed in the ventilation spacer 40.41.

The exhaust muffler 22 (23) having the above configuration is connected and fixed by a bolt 47 between its lid body 31 and a connecting member 46 fixed to the rear end of the muffler 20 (21).

To explain its operation, the exhaust gas from the muffler 20 (21) is discharged from the exhaust outlet pipe 39 through the first and second inner cylinders 27, 28 and the exhaust pipe 35 as indicated by the solid line arrows in the figure. At this time, as shown by the dotted chain arrow in the figure, the running air flows through the gap between the front cover 42 and the lid 31, the ventilation holes 40a and 41a of the ventilation spacers 40 and 41, and the rear cover 43 and the exhaust outlet pipe. 39, the outer cylinder 29 is effectively cooled. Further, tar-like exhaust oil discharged from the gas outlet of the exhaust outlet pipe 39 is deposited in the gap between the rear cover 43 and the exhaust outlet pipe 39, the ventilation hole 41a140a, the front cover 42, and the lid, as shown by the dotted line arrow in the figure. Since the water flows down through the gap in the body 31, the surface of the outer cylinder 29 is prevented from being contaminated.

[Effects of the Invention] As explained above, according to the present invention, the outer cylinder of the exhaust muffler is prevented from becoming high temperature due to the heat of the exhaust gas, since the running air can be circulated between the inner cylinder and the outer cylinder. This prevents burning and discoloration of fiber-reinforced plastics such as carbon fiber and ceramic fiber, decorative plating, and paint applied to the outer surface of the silencer. In addition, the tar-like exhaust oil discharged from the gas discharge port does not flow down the surface of the exhaust silencer outer cylinder, thereby preventing the outer cylinder from becoming dirty.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the vehicle exhaust silencer of the present invention, FIG. 2 is a perspective view of the ventilation spacer in FIG. 1, and FIG. 3 is an overall side view of the motorcycle according to the present invention. It is a diagram. 22.23...Exhaust silencer, 28...Inner cylinder, 29.
・・Outer cylinder, 40.41 ・・Ventilation spacer, 40a
141a...Ventilation hole. Applicant: Yamaha Motor Co., Ltd. Representative Patent Attorney
Hiroki Shirai (7 others) Figure 2

Claims (1)

[Claims] (1) In a vehicle equipped with an exhaust muffler arranged so as to be inclined with the gas exhaust port facing upward, the exhaust muffler is
It has an inner cylinder, an outer cylinder, and a ventilation spacer that is arranged between the inner cylinder and the outer cylinder and has a ventilation hole, and allows running air to flow between the inner cylinder and the outer cylinder. A vehicle exhaust silencer characterized by: