JPH0433376Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an exhaust system for a tractor engine.

(Prior technology) Developed in 1978 as an exhaust system for tractor engines.
There is a technique disclosed in the -22410 publication.

That is, as shown in FIGS. 10 and 11, an engine 2 is mounted on a tractor body 1, a front blower blower 3 for a radiator is mounted in front of the engine 2, and the exhaust side of the engine 2 is mounted in front of the engine 2. A first-stage muffler 4 and a second-stage muffler 5 are respectively connected to the muffler 4, and a delivery end 7 of an exhaust pipe 6 in the second-stage muffler 5 is opened on one side in the left-right direction. The member is covered with a bonnet 9 having a top plate 8 which can be opened and closed.

(Problems to be solved by the invention) In the conventional technology shown in FIGS. 10 and 11, since the cooling air of the blast air 3 hardly comes into contact with the outlet end 7 of the exhaust pipe 6, It easily became high temperature.

Further, the exhaust gas from the exhaust pipe 6 caused soot to adhere to the bonnet 9 and the like.

This invention actively cools the discharge end of the exhaust pipe with the air blown by the blower, and also actively uses the suction effect on the exhaust gas to prevent soot from adhering to the exhaust gas from contaminating the bonnet, crops, etc. The purpose is to prevent

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by:
An engine 11 and a front blower 12 are mounted, a muffler 14 is connected to the exhaust side of the engine 11, and the engine 11, the blower 12 and the muffler 14 are connected to a bonnet 16 having a guard 23 on the front part 18. In the case of the covered one, the tip thereof is attached to the guard 2 on one side in the left and right direction of the bonnet front section 18 on the air blowing side of the blower 12.
A cylindrical discharge nozzle 26 is provided at a position that does not protrude forward from the muffler 14 so that the cylinder axis can send air in the front and rear direction. The delivery end 24 is inserted, an air supply passage 28 is formed by the inner peripheral surface of the discharge nozzle 26 and the outer peripheral surface of the discharge end 24, and a protruding edge 26a that projects inward is formed on the inner periphery of the tip of the discharge nozzle 26. The point is that it is formed around the entire circumference.

(Operation) Exhaust gas from the engine 11 is discharged forward from the bonnet front portion 18 as shown by arrow 29 from the delivery end 24 of the exhaust pipe 15 in the mufflers 13 and 14.

In this case, since the discharge nozzle 26 has the air supply passage 28 and the discharge end 24 is inserted, the blower 1
The cooling air from 2 flows as shown by the arrow 30 and reaches the outlet end 2.
4 will be cooled and the exhaust gas will be sucked in.

On the other hand, the tip of the delivery end 24 is connected to the cylindrical discharge nozzle 2.
6, soot from exhaust gas etc. can adhere to the inner circumferential surface of the discharge nozzle 26, preventing contamination of the bonnet, etc., and the tip of the nozzle 26 Since it does not protrude forward from the guard 23, interference with obstacles (tree branches, etc.) is prevented.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIGS. 5 and 6, 10 is a tractor body, which in this example is in the form of wheels.

11 is an installed engine, and this engine 11
Front jet cooling blower 1 for the radiator in front of the
2 is installed.

13 and 14 are first-stage and second-stage mufflers, which are connected to the exhaust manifold 11A of the engine 11.

Although the mufflers 13 and 14 are shown as having a two-stage structure in the embodiment, they may have a one-stage structure, so they are represented as the muffler 14 in the following description (including the claims).

The exhaust pipe 15 of the muffler 14 is located on one side of the left and right in the longitudinal direction of the aircraft body and protrudes forward through a curved path.

16 is a bonnet, and the above-mentioned engine 1
1. The blower 12 and muffler 14 are covered.

In this embodiment, a pair of left and right side bonnets 17
It is mainly composed of a front part 18 and a top plate part 19, and the top plate part 19 can be opened and closed freely as shown in FIG. 7, and the side bonnet 17 has a grid-shaped safety cover 20. The front part 18 is further provided with a lamp device 21, an insect screen 22, and a grid mask 23.

Referring to FIGS. 1 to 3, the exhaust pipe 15 has a delivery end 24 shaped like a vertically oblong circle, and is supported on the fixed side via a bracket 25 or the like.

The reason why the delivery end 24 of the exhaust pipe 15 is formed into a vertically long oval shape is to minimize mutual interference with the inner surface of the bonnet 16.

Reference numeral 26 denotes a discharge nozzle, which is provided by welding or other fixing means on one side in the left and right direction at the intermediate portion in the height direction of the front surface portion 18 of the tractor bonnet.

That is, the air blower 12 is provided on the lower side of the air blower 12 so as to be able to send air in the front and rear directions. The portion 27 is fixed to the front portion 18 by welding, bolting, or the like. A protruding edge 26a, which is partially bent and protruded inward, is formed on the inner periphery of the tip of the discharge nozzle 26 over the entire circumference.

A delivery end 24 of the exhaust pipe 15 is inserted into the discharge nozzle 26 with an air supply passage 28 provided on the outer periphery.

That is, the distal end of the delivery end 24 is inserted into the cylindrical discharge nozzle 26, with the tip thereof located at a midway point in the length of the cylinder axis.

Therefore, the exhaust gas from the engine 11 passes through the muffler 14 and the exhaust pipe 15 and is discharged from the delivery end 24 as shown by the arrow 29, while the cooling air is sent through the air passage 28 as shown by the arrow 30. On the other hand, soot caused by exhaust gas from the delivery end 24 tends to adhere to the inner peripheral surface of the discharge nozzle 26, thereby reducing contamination of the bonnet, crops, etc.

FIG. 4 shows a second embodiment of the present invention, in which a wind direction changing pipe 31 is fitted onto the discharge nozzle 26 and attached with a band 32, and another case where a wind direction changing pipe 33 is attached to the delivery end 24. Either of the deflection tubes 31, 33 or either one of the deflection tubes can be attached, and in any case, the exhaust direction can be changed to the left or right depending on the direction of the deflection tubes 31, 33. It can be turned up and down.

8 and 9 show an improvement plan for the safety cover 20. FIG.

First, in FIG. 8, a window is opened in the side bonnet 17, and in order to close this window with a lattice frame 35 having an insect screen 34, the frame 35 is fixed with bolts 36. A discharge hole 37 is provided in the vertical direction.

Therefore, dust etc. adhering to the insect screen 34 can be dropped downward through the discharge hole 37.

The one shown in FIG. 9 is the same as the above-mentioned FIG. 8, but a front and rear drawer type rail 38 is provided on the window, and a frame 39 having an insect screen 34 is slidably provided on the rail 38. Therefore, dust etc. adhering to the net 34 can be cleaned by pulling out each frame 39.

(Effect of the invention) According to the invention, the front part 18 of the bonnet 16
A discharge nozzle 26 is provided on the downstream side of the cooling air of the nozzle 26, and an air supply passage 2 is provided in the nozzle 26.
8 and the delivery end 24 of the exhaust pipe 15 in the muffler 14 is inserted, so the delivery end 24 can be cooled with cooling air, reducing the risk of burns and reducing the impact on crops, etc. . Furthermore, since the exhaust gas is sucked in by the cooling air, the engine can be exhausted smoothly, and the exhaust noise is covered with the cooling air, which increases the noise reduction effect.

Further, the tip of the delivery end 24 is a cylindrical discharge nozzle 26.
Since the bonnet 16 is located in the middle of the cylindrical axis length, soot caused by exhaust gas etc. easily adheres to the inner circumferential surface of the discharge nozzle 26 and can be prevented from adhering to the outside. It can prevent soiling and contamination of crops, etc. In particular, a protruding edge 26a that protrudes inward is formed on the inner periphery of the tip of the discharge nozzle 26, so that the cooling air flowing through the air supply passage 28 is disturbed when it hits the protruding edge 26a and flows into the exhaust pipe. Mix with exhaust gas from 15. Therefore, the exhaust gas does not directly go outside, and the protruding edge 26a
This makes it possible to capture soot in the exhaust gas, thereby significantly suppressing staining and contamination of the bonnet 16, crops, etc.

Furthermore, since the discharge nozzle 26 does not protrude forward beyond the guard 23, there is less chance of contact with obstacles, etc., and no deformation occurs.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view showing the main parts of an embodiment of the present invention, Fig. 2 is a front (front) view of the same, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a second embodiment of the invention. A cross-sectional plan view of the example, FIG. 5 is a side view of a part (first half) of the tractor equipped with the proposed device, FIG.
The figures are side views with the bonnet open, Figures 8 and 9.
The figure is a sectional view showing two examples of the line section B-B in Figure 5.
FIG. 10 is a side view of the conventional example with the bonnet open, and FIG. 11 is a plan view thereof. 10... Tractor body, 11... Engine, 1
2...Blower, 14...Muffler, 16...Bonnet, 18...Front section, 24...Output end, 26...
...Discharge nozzle, 28...Air supply passage.

Claims (1)

[Scope of utility model registration request] The tractor body 10 is equipped with an engine 11 and a forward blower 12.
A muffler 14 is connected to the exhaust side of the engine 11, the blower 12, and the muffler 14 are connected to the front part 18.
In the case where the bonnet 16 is covered with a guard 23 on the outside, on one side in the left and right direction of the bonnet front part 18 on the air blowing side of the blower 12,
A cylindrical discharge nozzle 26 is provided so that its tip does not protrude forward from the guard 23, and its cylindrical axis is capable of supplying air in the front-rear direction.
The delivery end 24 of the muffler 14 is inserted within the muffler 14 with its tip positioned midway along the length of the cylinder axis, and an air delivery passage 28 is formed by the inner peripheral surface of the discharge nozzle 26 and the outer peripheral surface of the delivery end 24. An exhaust system for a tractor engine, characterized in that a protruding edge 26a protruding inward is formed on the inner periphery of the tip of the discharge nozzle 26 over the entire circumference.