JPS595766B2 - Hikisouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to an exhaust system.

As is well known, the exhaust system for a vehicle-mounted engine consists of an exhaust connecting pipe derived from the engine and a muffler installed at the end of the pipe. Conventionally, the pipe and muffler were integrated by welding. Generally, they are supported together on the vehicle body frame side, and the exhaust connecting pipe is configured to receive vibrations from the engine, and the end portion, muffler, etc. are configured to receive vibration damping from the vehicle body frame. Because of this, the welded parts break and cause problems such as exhaust noise and leakage of exhaust gas.

The present invention has been made to solve the above problem, and its purpose is to completely eliminate the chance of breakage by configuring the exhaust connecting pipe side including the engine and the muffler body separately from the beginning. The purpose of this system is to attenuate exhaust noise and purify exhaust gas by regulating and directing exhaust noise and exhaust gas that may leak through the muffler outer cylinder, and its features are as follows: The engine is equipped with an exhaust connecting pipe, and the connecting body has a muffler body whose tip is fitted externally without contacting the end of the exhaust connecting pipe through a circumferential gap, and a muffler body that has the entire muffler body inside and whose tip is the exhaust gas. The muffler outer cylinder is provided with a connecting pipe and a muffler outer cylinder that is fitted onto the outside of the muffler body without touching the tip of the muffler body, and is inserted between the outer circumferential surface of the muffler main body tip and the inner circumferential surface of the muffler outer cylinder tip without contacting the two. A regulating body having a cylindrical body portion is fitted onto the exhaust communication pipe so as to seal a gap between the cylindrical body portion and the exhaust communication pipe at a position forward of the front end surface of the muffler body.

The present invention will be explained below with reference to illustrated examples.

Fig. 1 shows a specific embodiment of a self-explanatory type passenger combine harvester, which is not particularly limited, and shows the related parts, and 1 indicates the body frame (
A traveling system 2 such as a crawler type is placed under the same frame 1 (chassis), and an engine E and a threshing section 3 are generally placed from the front side.

The exhaust system 4 is provided to be continuous with an exhaust communication pipe 5 derived from the engine E, such as a side valve type engine, and extending to the rear side through the left and right sides of the vehicle body frame 1, and the end of the pipe 5. In the muffler body 6, sound insulating plates 6a are installed longitudinally in a zigzag row to form a zigzag route, and 6b is an exhaust port at the end of the muffler body 6. Against these? is a muffler support rod that is horizontally suspended between the front and rear of the vehicle body frame 1.

With the above background, the main parts of the present invention will be explained. As shown in the second figure, the end of the exhaust connecting pipe 5 is separated from the tip of the muffler body 6 and does not come in contact with it, leaving a desired circumferential gap C in a nested manner. It communicates with the muffler body 6 for the same pipe 5.
are supported on the muffler support rod 1 via a muffler outer cylinder 8 which is large and open from front to back in a similar manner to the main body 6.

Here, the muffler outer cylinder 8 has a longitudinal length that can sufficiently surround the outer periphery of the communication portion between the exhaust communication pipe 5 and the muffler main body 6, and the exhaust port 6b of the muffler main body 6, and protrudes toward the outer periphery. The muffler main body 6 is supported via a connecting bracket 9, and the muffler body 6 is neutrally installed inside the muffler outer cylinder 8 through muffler holders 10, 10 provided by welding or the like to maintain a circumferential gap. There is. That is, the muffler outer cylinder 8 is provided so that its tip does not come into contact with the exhaust communication pipe 5 or the muffler main body 6 tip.

Furthermore, the outer peripheral surface of the tip of the muffler main body 6 and the muffler outer cylinder 8
A regulating body 11 having a cylindrical body 11a inserted between the two without contacting the inner circumferential surface of the tip (gap between the cylindrical body 11a and the exhaust communication pipe 5 at a position forward of the tip surface of the muffler body 6) It is fitted and fixed to the exhaust communication pipe 5 so as to seal it tightly.

Therefore, according to the embodiment of the present invention, the exhaust communication pipe 5
The tip vibrates independently on the combine and operates with a relatively large amplitude, but since the tip is a free end and is separated from the muffler body 6 side, there is no interference between the two 5 and 6. In addition, there is no need for welding between the exhaust connecting pipe 5 and the muffler body 6, so there is no need for workers to worry about welding mistakes, and the assembly can be completed in a short time. 7) Possible as an independent device.

Furthermore, since the longitudinal expansion and contraction that occurs between the two 5 and 6 during the separation is flexible, there is less chance of breakage in this respect as well.

Regarding exhaust noise, the sound leaking from the circumferential gap C is regulated by the protrusion of the muffler outer cylinder 8, and the exhaust gas leaks from the - part circumferential gap C, but the muffler outer cylinder The gas is guided to the rear side by the suction force generated at the end of the muffler outer cylinder 8 through the inside of the muffler outer cylinder 8, and since the gas passes through the outside, the speed can be reduced, and air is supplied from the tip of the muffler outer cylinder 8. It has the opportunity to be re-burned and purified.

Note that the welded parts added to the muffler holder 10, the muffler main body 6, and the muffler outer cylinder 8 are less likely to be damaged due to the separation of the support p.

Furthermore, an L-shaped sound regulation board 11 is attached to the front side of the circumferential gap C to form a bending route to the rear, thereby attenuating the exhaust sound and guiding the exhaust gas to the rear. do.

As described above, in the present invention, the tip of the muffler main body 6 provided on the vehicle body side is externally fitted to the end of the exhaust communication pipe 5 provided in the engine E through the circumferential gap C.
There is no risk of breakage or the like occurring at the communication point between the exhaust connecting pipe 5 and the muffler body 6, and there is no need to perform welding work between the exhaust connecting pipe 5 and the muffler body 6. Since the exhaust device 4 can be assembled separately, the exhaust device 4 can be easily assembled.

In addition, by attaching a muffler outer cylinder 8 containing the muffler main body 6, free dissipation of exhaust gas can be prevented, and the outer cylinder 8 is especially suitable for use with combine harvesters and the like, where straw waste etc. are heated to a high temperature muffler. It is possible to prevent contact with the main body 6 and a fire. Furthermore,
A regulating body 11 that protrudes radially outward over the entire circumference with respect to the circumferential gap C is fitted on the front side of the circumferential gap C at the end of the exhaust end pipe 5, so that the exhaust Circumferential gap C between the end of the connecting pipe 5 and the tip of the muffler body 6
The regulating body 11 can almost prevent exhaust noise and leakage of exhaust gas forward from the exhaust gas, and since the regulating body 11 is fitted into the exhaust connecting pipe 5 without coming into contact with the muffler body 6 or the muffler outer cylinder 8, the exhaust Vibrations are not mutually propagated between the communication pipe 5 and the muffler outer cylinder 8 via the damping body 11, and there is no risk of damage to the welded parts due to the propagation of the vibrations. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view of a specific example of the present invention as constructed with respect to a combine harvester, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1.

4...Exhaust device, 5...Exhaust connection pipe, 6...Muffler body, 8...Muffler outer cylinder, 11...Regulations Body, E...Engine.

Claims (1)

[Claims] 1 Engine E is equipped with exhaust connection pipe 5, on the vehicle body side,
A muffler body 6 whose tip is externally fitted to the end of the exhaust communication pipe 5 without contacting the end of the exhaust communication pipe 5 through a circumferential gap C;
The muffler outer cylinder 8 is provided with a muffler outer cylinder 8 which is entirely internal and whose distal end is fitted onto the outside without contacting the exhaust communication pipe 5 and the muffler main body 6 distal end, and the muffler outer cylinder 8 A regulating body 11 having a cylindrical body portion 11a inserted between the two without contacting the inner circumferential surface of the tip portion closes the gap between the cylindrical body portion 11a and the exhaust communication pipe 5 at a position forward of the tip surface of the muffler body 6. An exhaust device characterized in that the exhaust connecting pipe is fitted in a sealed manner.