JPH048244Y2 - - Google Patents

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 a flange, which is attached to an engine (not shown) with a nut or the like. Reference numeral 02 denotes an exhaust pipe that connects an upper silencing box 03 and a lower silencing box 04 to the flange 01. 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. As a result, high-variety, low-volume production has to be sacrificed, leading to decreased productivity and high costs.

In addition, when attaching and detaching the silencer, the flange 0
The work of tightening and removing the nuts and the like fixing the 1 requires special tools such as long boxes because the work efficiency is extremely poor.

The purpose of the present invention is to provide a muffler that eliminates the above-mentioned drawbacks, and its features include a sheet metal muffler in which the muffler body is detachably attached to the exhaust pipe attached to the engine body. A silencer body is integrally provided with a connecting pipe through which the exhaust pipe is inserted, and a blind stopper is provided at the tip of the silencer body, which projects from the engine mounting flange, is inserted into the silencer body through the connecting pipe, and comes into contact with the opposing inner surface. and an exhaust pipe in which a fixing fitting with a welding nut is fixed to the outside of the blind plug, and the exhaust pipe is detachably fixed to the muffler body from the outside of the muffler body to the welding nut. It consists of a bolt to be tightened and a fixing member that detachably fixes the connecting pipe and the exhaust pipe.

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, FIG. 3 is a sectional view taken along the - arrow in FIG. 2, and FIG. 4 is a sectional view taken along the - arrow in FIG. FIG. 5 is a perspective view showing the clamp 12.

In the figure, reference numeral 1 denotes a mounting flange, which 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 the mounting flange 1 by welding or the like, and a fixing fitting 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, and 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.

A clamp 12 has a shape as shown in FIG. 5, and is used to tighten the connecting pipe 9 with a bolt 13 and a nut 14.

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

A silencer cover 16 is attached to the engine with bolts or the like, and completely covers the silencer body 8 and the like.

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

The 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 into welding nut 5.

Next, with the bolt 13 and nut 14, the third
As shown in the figure, the clamp 12 is tightened to improve the adhesion between the connecting pipe 9 and the exhaust pipe 3, thereby improving the sealing performance and the mounting strength of the muffler main 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 can easily be used with various types of silencers by simply replacing the silencer main body 8 of various structures, and can be fully adapted to small-scale production of many types.

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

Note that since the blind plug 4 provides heat insulation, there is no fear of the bolt 15 seizing or the like, and there is no problem in removing the bolt 15.

FIG. 6 is a sectional view (corresponding to FIG. 4) showing another embodiment of the silencer 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. Reference numeral 9a denotes a flange portion, which is formed by bending the end of the connecting pipe 9 outward. Reference numeral 11a denotes a side wall, which bulges outward as shown by a two-dot chain line.

The connecting pipe 9 of the muffler main body 8 is fitted onto the exhaust pipe 3, and the flange part 9a is attached to the ring 2 through the packing 22.
1. When the bolt 15 is tightened to the welding nut 5, the side wall 11a changes from the state shown by the two-dot chain line to the state shown as the solid line, and the exhaust pipe 3 and the connecting pipe 9
Ensure a good seal between.

Note that by fixing the ring 21 to the exhaust pipe 3 with bolts (not shown) or the like, the axial position of the exhaust pipe 3 can be freely determined, thereby allowing various types of muffler bodies to be attached and detached.

Furthermore, as shown in FIG.
6 may be formed with a recessed portion 16a, and may be fastened together with the silencer main body 8.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional muffler, Fig. 2 is a front view showing main parts of an embodiment of the muffler according to the present invention, Fig. 3 is a sectional view taken along the - arrow in Fig. 2, and Fig. 4 is a sectional view showing a conventional muffler. The drawings are a cross-sectional view taken along the - arrow in FIG. 2, FIG. 5 is a perspective view showing the clamp, FIG. 6 is a cross-sectional view showing another embodiment of the silencer according to the present invention, and FIG. 7 is a still further embodiment according to the present invention. FIG. 2 is a sectional view showing the main parts of the embodiment. 1... Mounting flange, 3... Exhaust pipe, 5... Welding nut, 8... Silencer body, 9...
Connection pipe, 11... Sound deadening box, 12... Clamp, 1
3,15...Boruto, 14...Natsuto.

Claims (1)

[Scope of utility model registration request] In sheet metal mufflers, the muffler body is removably attached to the exhaust pipe attached to the engine body.
A silencer body is integrally provided with a connecting pipe through which exhaust noise is inserted, and a blind plug is provided at the tip of the silencer body that protrudes from the engine mounting flange and is inserted into the silencer body through the connecting pipe and abuts the opposing inner surface. and an exhaust pipe in which a fixing fitting with a welding nut is fixed to the outside of the blind plug, and the exhaust pipe is detachably fixed to the muffler body from the outside of the muffler body to the welding nut. A muffler for an internal combustion engine, comprising a bolt that is tightened and a fixing member that detachably fixes the connecting pipe and the exhaust pipe.