JPS582413A - Silencer of internal combustion engine - Google Patents

Abstract

PURPOSE:To enable easy fitting of various silencers to an exhaust pipe by inserting the end of the exhaust pipe two the silencer and then bolting the silencer to the extreme end. CONSTITUTION:An exhaust pipe 3 having a flange 1 for fitting to the external wall of an engine has many pores 7 and is closed with a blank cap 4 at the end, with a nut 5 secured at the back thereof. The silencer 11, while guided by an inserted pipe 9 thereof, is from the end of the exhaust pipe 3 along its external face until the end of the pipe 3 comes into contact with the inner face of the silencer. A bolt 15 is screwed into the nut 5 to fix and thereafter, the external face of the insert pipe 9 is fastened with a cramp 12, thereby firmly fitting the silencer 11 to the exhaust pipe 3.

Description

[Detailed description of the invention] The present invention relates to improvements in mufflers used in internal combustion engines.

A conventional silencer of this type is shown in FIG. In the figure, 01
is attached to the Franz engine (not shown) by a nut or the like. 02 is an exhaust pipe that connects the upper muffling box 03 and the lower muffling box 04 to the 7 lunges 01 mentioned above. The above parts are integrally formed by welding to prevent vibration and gas leakage. 05 is an exhaust outlet.

The above has the following drawbacks.

It is necessary to prepare silencers with various structures depending on the position of the exhaust outlet and the direction of exhaust. Moreover, since it is an integrated type, it lacks compatibility. Therefore, it is necessary to produce a wide variety of products in small quantities, resulting in decreased productivity and high costs.

Furthermore, when attaching and detaching the silencer, it was necessary to prepare a special tool such as a long box because the work efficiency was extremely poor for tightening and removing nuts and the like that fixed the flange 01.

An object of the present invention is to provide a silencer that eliminates the above-mentioned drawbacks, and its features include: 1. Installation of the silencer body to the engine 7. Protruding from the run. The exhaust pipe is provided with an exhaust pipe whose tip is brought into contact with the inner surface of the opposing muffler main body through the connecting pipe to removably fix the muffler main body.

The present invention can be widely applied to general-purpose internal combustion engines.

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

FIG. 2 is a front view showing the main parts of a silencer according to an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line IV--IV in FIG. 2, and FIG. 5 is a perspective view showing the clamp 12.

In the figure, reference numeral 1 denotes a mounting flange, and 2 is fixed to an engine (not shown) with a nut 2 or the like.

Reference numeral 3 designates an exhaust pipe, one end of which is fixed to a mounting 7 flange 1 by welding or the like, and a perforated plug 6 to which a blind plug 4 and a welding nut 5 are fixed is fixed to the other end by welding or the like. A large number of small holes 7 are formed inside the muffler main body 8.

The muffler main body 8 is composed of a connecting pipe 9 and a muffler box 11,
It is detachably fixed to the exhaust pipe 3.

The connecting pipe 9 has the exhaust pipe 3 inserted therein, has a required number of slits 10 (four in this embodiment) as shown in FIG. 2, and is fixed to the sound deadening box 11 by welding or the like. .

Tighten the throttle tube 9 with the bolt 13 and nut 14.

, 15 fixes the muffling box 11 to the perforated plug 6 of the exhaust pipe 3 with bolts.

16 is a silencer cover that is attached to 9 engines with bolts, etc.
Covers the silencer body 8 etc. completely.

The operation in the case of the above configuration will be described.

A case where the silencer main body 8 is attached to the engine will be explained.

Fit the connecting pipe 9 (only the clamp 12 is attached in advance) of the muffler main body 8 onto the exhaust pipe 3, bring the end of the exhaust pipe 3 into contact with the opposing inner surface of the muffler box 11, and then tighten the bolts 15. screw onto welding nut 5.

Next, as shown in FIG. 3, tighten the clamp 12 with the bolt 13 and bolt 14, and connect the connecting pipe 9 and the exhaust pipe 3.
The sole property and the mounting strength of the silencer body 8 are improved by increasing the adhesion of the silencer body 8.

Finally, the muffler cover 16 is fixed to the engine.

When removing the muffler main body 8, the procedure described above may be reversed.

The above case has the following effects.

Since up to the exhaust pipe 3 can be shared, it is possible to easily accommodate various types of silencers by simply replacing the silencer body 8 with various structures.
It is fully applicable to high-mix, low-volume production.

Because of the structure in which only the silencer main body 8 is attached and detached, the operation of attaching and detaching the two is extremely simplified, and workability is also improved.

In addition, since the blind plug 4 provides heat insulation, there is no risk of the bolt 15 seizing or the like. There is no problem in removing the root 15.

FIG. 6 is a sectional view (corresponding to FIG. 4) showing another embodiment of the muffler according to the present invention.

Differences from the embodiments described above will be explained.

A ring 21 is fixed to the exhaust pipe 3 by welding or the like.

22 is a seal made of a heat-resistant sealing material. 9
A is a flange portion, which is formed by bending the end of the connecting pipe 9 outward. lla is a side wall that bulges outward like a two-dot chain line.

The connecting pipe 9 of the muffler main body 8 is externally fitted onto the exhaust pipe 3, and the flange portion 9a is brought into contact with the ring 21 via the nozzle ring 22. Weldinga bolt 15.

When tightened to 5, the side wall 11a deforms from the state shown by the two-dot chain line to the state shown by the solid line, ensuring the seal between the exhaust pipe 3 and the connecting pipe 9. By fixing it to the exhaust pipe 3, the axial position of the exhaust pipe 3 can be freely determined, allowing various types of muffler bodies to be attached and detached.

Furthermore, as shown in FIG. 7, a concave portion 16a may be formed in the muffler force 4-16 and aligned with the muffler main body 8.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional muffler, FIG. Figure 4 is i of Figure 2.
v-■ A sectional view in the direction of the arrow, FIG. 5 is a perspective view showing the clamp,
FIG. 6 is a cross-sectional view showing a silencer according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing essential parts of still another embodiment according to the present invention.・Exhaust pipe, 5... Welding nut, 8... Silencer body, 9... Connection pipe, 11... Silence box, 12... Franz, 13.15... Bolt. 14...Natsuto.

Claims (1)

[Claims] 1. Attachment to the 9 engines of the silencer body provided with a connecting pipe through which the exhaust pipe is inserted.The silencer body is installed by protruding from the flanz and coming into contact with the inner surface of the silencer body facing the tip metal through the connecting pipe. A silencer for an internal combustion engine, characterized by having an exhaust pipe to which the silencer is detachably fixed.