JPS6316831Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust system for an engine mounted on a working machine such as a tractor.

In general, when the muffler of a work machine is supported by the machine body (body part other than the engine), relative vibration occurs between the engine body and the muffler, so the exhaust outlet on the engine side and the muffler are Although it is necessary to connect with a certain joint, it is actually difficult to employ such a joint structure when considering cost reduction and structural simplification. One possible solution to this problem is to mount the muffler directly to the engine body, but adopting the conventional direct-mounting structure increases the overall volume of the engine, so when mounting the engine under the bonnet, such as in a work machine, the conventional It is difficult to adopt a direct mounting structure, and it is particularly unsuitable for engines for work equipment equipped with a turbocharger.

The present invention improves the layout of the muffler, etc., thereby making it possible to adopt a structure in which the muffler is directly attached to an engine for a work machine, and is constructed as follows.

In other words, the present invention mounts the engine body in front of the cockpit of the work equipment, provides an exhaust manifold on one side of the engine body, and arranges a turbocharger on the side of the exhaust manifold. The muffler is placed above the turbocharger in a posture extending in the longitudinal direction, and the muffler is fixed to the engine body via brackets at multiple locations spaced apart at the front and back of the muffler, and the intake air on the outlet side of the turbocharger is fixed. Arrange the pipe so that it extends from the bottom of the muffler to the top of the engine body, and extend the exhaust connecting pipe of the turbocharger upward from the front end of the turbocharger and connect it to the lower front end of the muffler, and connect it to the inside of the muffler. It is characterized by forming an inverted passageway from the front end to the rear end to the front end, and extending the exhaust pipe on the outlet side of the muffler upward and forward from the front end of the muffler.

Next, embodiments will be described with reference to the drawings.

FIG. 1 is a partial side view of a diesel engine to which the present invention is applied. In FIG. 1, 1 is a cylinder block, 2 is a cylinder head,
An exhaust manifold 3 is fixed to the side wall of the cylinder head 2 with bolts 5. The right end of the exhaust manifold 3 is bent upward, and a substantially square flange 4 is formed at the right end outlet. In addition, in the present invention, the cylinder block 1, the cylinder head 2, and the exhaust manifold 3 are
The other side is called the engine body side. Exhaust manifold 3
A horizontal muffler 6 is placed above the engine, and the muffler 6 is fixed to the engine body in the following manner.

That is, below the left end of the muffler 6 in FIG.
A first muffler side bracket 7 having a U-shape in the direction of the arrow is welded, and a pair of muffler side second brackets 8 are located on both sides of the right end portion of the muffler 6 in Figure 1 (on the front and back sides of the page in Figure 1). It is welded. The first muffler side bracket 7 has two nut parts 9, and the main body side first bracket 10 is fastened to the lower side of the muffler side first bracket 7 with bolts 11. is bolt 1
2 is fastened to the side surface of the cylinder head 2. A body side second bracket 13 having a U-shape as seen in the arrow (FIG. 2) and having a nut portion 14 is fastened to the lower side of the muffler side second bracket 8 with a bolt 15. is fastened to the upper end of the flange 4 of the exhaust manifold 3 by bolts 16.

A turbocharger 20 is fixed to the engine body independently of the muffler 6. That is, a substantially square outward flange 21 is formed at the upper right end portion of the turbocharger 20, and this outward flange 21 is fastened to the flange 4 of the exhaust manifold 3 with four bolts 22 and nuts 23. It is worn. The case of the turbocharger 20 consists of a turbine case 25, a center case 26, a compressor case 27, etc., and an intake air inlet 27a of the compressor case 27 has a first intake pipe 28 communicating with the air cleaner. (imaginary line) is connected, and a second intake pipe 29 leading to the combustion chamber side is connected to the intake air outlet portion 27b of the compressor case 27.
The exhaust gas inlet portion 25a of the turbine case 25 is connected to the exhaust manifold 3 by the flanges 4, 21, etc.
The exhaust gas outlet portion 25b is connected to the exhaust communication pipe 30. Exhaust connection pipe 30
The flange portion 31 is fastened to the turbine case 25 by bolts 32, and is formed into a bend shape that is bent upward. Exhaust connecting pipe 3
0 is connected to the muffler 6 in the following manner so that the load of the muffler 6 is not applied to the case of the turbocharger 20.

That is, in FIG. 3, which is an enlarged partial cross-sectional view of the arrowed part in FIG. An inlet cylindrical body 34 that projects downward is welded. A plurality of (two) annular grooves are formed on the outer periphery of the cylindrical body 34, and a seal ring 35 cut out at one location is fitted into the annular groove as shown in FIG. Socket part 3
3 is fitted onto the outer periphery of the cylindrical member 34 from below, and the space between the inner circumferential surface of the socket portion 33 and the outer circumferential surface of the cylindrical body 34 is maintained in an airtight state by a seal ring 35. Note that the seal ring 35 is attached to the socket portion 33, for example, like a piston ring of an engine.
When fitted into the cylindrical body 34, it contacts the inner circumferential surface of the socket portion 33 with a constant pressure.

Further, as shown in FIG. 2, the exhaust connecting pipe 30 is also fastened to the exhaust manifold 3 with bolts 37 via a bracket 36.

In Fig. 1, 39 is the lubricating oil inlet;
0 is the lubricating oil outlet.

As shown in FIG. 5, which is a cross-sectional view of FIG.
It is equipped with 53 and 54 are end walls of the main body 50;
The cylindrical body 34 is provided near the end wall 53. An annular member 55 is fixed to two locations on the inner peripheral surface of the main body 50, and the member 55 supports the outer cylinder 51 concentrically. A sound-absorbing and heat-insulating material 56 such as glass wool is interposed between the inner peripheral surface of the main body 50 and the outer cylinder 51. The outer cylinder 51 has an end wall 57 adjacent to the end wall 54 at one end, and a sound-absorbing and heat-insulating material 56 is also interposed between the end walls 54 and 57. The other end of the outer cylinder 51 is open and the opening edge is in contact with the end wall 53. Partition walls 59 and 6 made of annular plates are provided at two locations in the longitudinal direction of the inner peripheral surface of the outer cylinder 51.
0 is attached, and one end and intermediate portion of the inner cylinder 52 are fitted and fixed to the inner peripheral edges of the partition walls 59 and 60. The left end of the inner cylinder 52 in FIG.
3 is formed. second and first expansion chambers 62,
61 is formed between the partition walls 59 and 60 and between the partition wall 60 and the end wall 53 between the outer cylinder 51 and the inner cylinder 52, respectively. As shown in FIG. 6, which is a cross-sectional view of FIG. 5, the partition wall 60 has a plurality of circular holes 65 on the same circumference, and the partition wall 59 in FIG. . The outer cylinder 51 is provided with a large number of pores 67 (only the negative part is shown) over the entire surface. The inner cylinder 52 is welded to the inner peripheral edge of the annular end wall 53, and a portion protruding from the end wall 53 is continuous with the exhaust pipe 69. The exhaust pipe 60 extends upward while being curved, and its upper end is opened diagonally upward.

Next, the positional relationship etc. when the above-mentioned engine is mounted on a working machine will be explained. In FIG. 1, the engine is mounted with the muffler 6 extending in the longitudinal direction of the vehicle and the exhaust pipe 69 protruding forward, and the turbocharger 20 is located on the front side of the engine body. The radiator 70 is located in front of the engine body. The bonnet 71 (only the trailing edge position is shown by a two-dot chain line) covers the radiator 70, the turbocharger 21, the muffler 6, and the front half of the engine body, and the tip of the exhaust pipe 69 protrudes from the bonnet 71 to the outside. . A cockpit (not shown) is provided at the rear of the engine, and the operator performs continuous rotation operation at a position away from the exhaust connecting pipe 30 and the exhaust pipe 69.

When the engine is in operation, the exhaust gas enters the first expansion chamber 61 of the muffler 6 in FIG. 5 from the turbocharger 20 through the exhaust connecting pipe 30 and the cylinder 34
From the expansion chamber 61 to the hole 65, the second expansion chamber 62, and the hole 66
It enters the third expansion chamber 63 through the expansion chamber 63, turns around in the expansion chamber 63, enters the inner cylinder 52, and is exhausted from the inner cylinder 52 to the outside via an exhaust pipe 69. During this time, expansion and interference of the exhaust gas occur in each of the expansion chambers 61, 62, and 63, and sound is absorbed by the sound-absorbing and heat-insulating material 56 through the many pores 67, and the exhaust gas is exhausted to the outside in a sound-absorbed state.

As explained above, in the present invention, the engine body is mounted in front of the cockpit of a working machine, the exhaust manifold 3 is provided on one side of the engine body, and the turbocharger 20 is installed on the side of the exhaust manifold 3.
The present invention is directed to a structure in which the intake pipe 29 on the outlet side of the turbocharger 20 is arranged in a posture extending from the lower side of the muffler 6 to the upper side of the engine main body.

In such a structure, a space is formed above the turbocharger 20 and on the side of the outlet side intake pipe 29, but in the present invention, the muffler 6 is arranged in that space in a posture extending in the front-rear direction. ing.
Therefore, when looking at the engine as a whole, it is possible to prevent the muffler 6 from protruding upward or sideways as much as possible, and to make the entire engine compact.

Furthermore, by arranging the muffler 6 so as to extend in the longitudinal direction, the entire muffler 6 can be arranged close to the engine body. Therefore, the muffler 6 can be stably fixed to the engine body at a plurality of spaced apart locations on the front and rear thereof via the simple-structured brackets 10 and 13.
That is, even if the muffler 6 is attached to the engine body, no problem arises in terms of the stability of the attached state, and it becomes possible to actually fix the muffler 6 to the engine body.

Furthermore, since the muffler 6 can be fixed to the engine body, there is no need to use flexible joints between the muffler 6, the turbocharger 20, and the exhaust connection passage, which simplifies the structure of the connection passage. Cost reduction can be achieved.

Furthermore, the exhaust connecting pipe 30 is connected to the turbocharger 20.
extends upward from the front end of the muffler 6 and connects to the lower front end of the muffler 6, forming an inverted passage inside the muffler 6 from the front end to the front end via the rear end, and connects the outlet side exhaust pipe 69 of the muffler 6 to the muffler. It extends upward and forward from the front end of 6.

According to this structure, the connecting pipe 30 and the exhaust pipe 69 can be installed compactly at the front of the entire engine, so it is easy to cover them together with the turbocharger 20 with the bonnet 71, and it is also possible to install them away from the cockpit. It can be arranged in such a position that the operator is less affected by heat and noise.

[Brief explanation of the drawing]

Figure 1 is a partial side view of a diesel engine to which the present invention is applied, Figure 2 is a view taken in the direction of the arrows in Figure 1, and Figure 3 is a partial side view of a diesel engine to which the present invention is applied.
The figure is an enlarged cross-sectional view of the arrowed part in Figure 1, Figure 4 is a view of the airtight component in the direction of the arrow in Figure 1, Figure 5 is a - sectional view of Figure 2, and Figure 6 is a - cross-sectional view of Figure 5. It is a diagram. 3... Exhaust manifold, 6... Muffler, 1
0, 13... Bracket, 20... Turbocharger, 29... Outlet side intake pipe, 69... Outlet side exhaust pipe.

Claims (1)

[Scope of utility model registration request] The engine body is mounted in front of the cockpit of the work equipment, an exhaust manifold is provided on one side of the engine body, and a turbocharger is placed on the side of the exhaust manifold and fixed to the engine body. Place the muffler above the turbocharger so that it extends in the front-rear direction, and fix the muffler to the engine body via brackets at multiple points spaced apart at the front and rear of the muffler. The exhaust connecting pipe of the turbocharger is extended upward from the front end of the turbocharger and connected to the lower front end of the muffler. An exhaust system for an engine for a working machine, characterized in that a reversing passage is formed from the end to the front end, and an exhaust pipe on the outlet side of the muffler extends upward and forward from the front end of the muffler.