JPS6126583Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an exhaust pipe structure in the muffler portion of an agricultural machine.

Conventionally, the muffler was installed inside the bonnet to ensure safety, and the bonnet surrounded the muffler, so the atmospheric temperature inside the bonnet was
The temperature reached over 100℃, which had a negative effect on various mechanisms inside the bonnet and was extremely dangerous.

In order to solve this problem, there are some configurations in which the air inside the bonnet is discharged to the outside along with the exhaust from the muffler, but these configurations have poor efficiency in exhausting the air inside the bonnet, and also have a low exhaust volume. There was no one that could easily adjust the increase or decrease of.

In this design, the air in the interior space of the bonnet is discharged by inducing exhaust from the exhaust pipe connected to the muffler, and the muffler, exhaust pipe, and cover tube can be inspected, repaired, and cleaned easily and quickly. The present invention aims to provide an exhaust pipe structure in a muffler portion of an agricultural machine that can be used.

To explain the embodiment of the present invention shown in the drawings, reference numeral 1 denotes a bonnet of a garden tractor A, in which an exhaust pipe insertion opening 1a is provided in the upper wall, and an exhaust pipe insertion opening 1a is provided in the interior space 11 below the exhaust pipe insertion opening 1a. A muffler 2 is provided at a location located at .

The muffler 2 has a tapered tube 3 protruding from its upper end, and the tapered tube 3 has a tapered fitting portion formed at its upper portion, which will be described later. The lower part of the exhaust pipe 4 is placed and supported in this manner.

Further, the tip of the exhaust pipe 4 protrudes to the outside of the bonnet 1, and a sideways exhaust port 5 is opened at the tip.

Furthermore, 6 is a cover tube of the exhaust pipe 4 that concentrically covers the outer periphery of the exhaust pipe 4 via the cooling space 7, and the lower end edge of the exhaust pipe 4 and the lower end edge of the cover tube 6 are connected to the exhaust pipe 4. They are integrally connected by a tapered fitting tube 12 which forms a part of the tube and whose diameter expands downward.

Therefore, this fitting tube 12 can be used as a part of the muffler 2 described above.
By fitting and supporting the tapered fitting portion formed on the upper part of the cover cylinder 3, the cover cylinder 6 and the exhaust pipe 4 can be rotatably and detachably mounted and supported above the tapered cylinder 3.

Moreover, by such mounting support, the tapered cylinder 3
The muffler 2 communicates with the exhaust pipe 4 through the muffler 2, and the internal space 11 of the bonnet 1 communicates with the annular cooling space 7 through a window hole 10 in the outer peripheral surface of the cover tube 6, which will be described later.

In addition, if the exhaust pipe 4 remains placed on the tapered tube 3, there is a risk that it will come off the tapered tube 3 during operation, so the cover tube 6 should be placed inside the bonnet 1.
A flange 8 is provided on the outer peripheral surface of the muffler 2, and a spring 9 for preventing the fitting tube from falling off is removably interposed between the flange 8 and the muffler 2, and the exhaust pipe 4 is tapered fitted into the tapered tube 3 by the spring 9. By press-fitting the parts, separation of the exhaust pipe 4 can be reliably prevented.

10 is a cover cylinder 6 inside the bonnet 1.
The window hole 10 is a window hole bored in the outer peripheral surface of the bonnet 1, and the window hole 10 connects the inner space 11 of the bonnet 1 and the cooling space 7.
can be communicated with.

Moreover, in the figure, B is a rotary connected to the garden tractor A via a hitch C.

Therefore, the exhaust is discharged from the muffler 2 through the tapered tube 3 and the exhaust pipe 4 to the outside from the exhaust port 5. During the exhaust, the area around the exhaust port 5 becomes negative pressure due to the exhaust flow, and is cooled. The air in the space 7 is drawn to the outside, and further the air inside the bonnet 1 is drawn into the cooling space 7.

In addition, if the muffler 2, exhaust pipe 4, cover tube 6, etc. are blocked, open and close the bonnet 1 and
By removing the exhaust pipe 4 and cover tube 6, the exhaust pipe 4 and cover tube 6 can be easily removed from the muffler 2, and then any necessary repairs such as cleaning can be performed. A series of repair work can be completed by attaching the muffler 2 to the muffler 2, applying the spring 9, and closing the bonnet 1.

As described above, with the present invention, hot air inside the bonnet can be integrally discharged to the outside by exhaust air from the muffler, and the exhaust pipe and cover tube can be attached to the muffler.・
Since the structure allows for extremely easy removal, there is an effect that repair and inspection work can be performed easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing a garden tractor having an exhaust pipe structure in the muffler part of the proposed agricultural machine, Fig. 2 is a sectional view of the main part, and Fig. 3 is a cross-sectional view of the main part.
FIG. 1...Bonnet, 2...Muffler, 4...Exhaust pipe, 5...Exhaust port, 6...Cover tube, 7...Cooling space, 9...Spring to prevent fitting tube from falling off, 10...
Window hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) An exhaust pipe insertion opening 1a is opened in the upper wall, and a muffler 2 is disposed within the internal space 11 at a location below the exhaust pipe insertion opening 1a. A bonnet 1, (b) a cover tube 6 which is inserted through the exhaust pipe insertion opening 1a and has an opening at its upper end, and (c) a cover tube 6 which is arranged concentrically within the cover tube 6 and has an exhaust port 5 at its upper end. An exhaust pipe 4 which has a tapered fitting tube 12 whose diameter expands downward in its lower part and integrally connects the lower end of the fitting tube 12 with the lower end of the cover tube 6; A window hole 10 is provided at the bottom of the bonnet 4 and communicates the internal space 11 of the bonnet 4 with the atmosphere via an annular cooling space 7 formed between the exhaust pipe 4 and the cover tube 6; muffler 2
A tapered tube 3 that opens inward and has a tapered fitting portion formed in the upper portion thereof to detachably and rotatably fit and support the fitting tube 12 of the exhaust pipe 4.
An exhaust pipe structure in a muffler portion of an agricultural working machine, comprising: (f) a spring 9 for preventing falling of a fitting tube which elastically connects a cover tube 6 and a muffler 2;