JPH057457Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust pipe structure for agricultural machinery that is devised to diffuse engine exhaust gas at the open end of the exhaust pipe.

[Conventional technology]

For example, in agricultural machinery such as tractors, the exhaust pipe of the engine is often extended upward in order to connect working equipment to the rear, but depending on the wind direction, the exhaust gas may easily hit the worker, creating a working environment. I was exposed to factors that worsened the situation.

Therefore, a structure in which the exhaust pipe extends downward has been desired.

[Problem that the invention attempts to solve]

However, if the exhaust pipe is directed downward, the exhaust air blown onto the field will kick up dirt and dust such as straw from the field, which is undesirable for the health of workers and is a factor that worsens the working environment. becomes. Therefore, for example, as disclosed in Japanese Utility Model Application Publication No. 55-69107, by arranging a diffusion member such as a baffle plate near the tip opening of the exhaust pipe to weaken the force of the exhaust air blown onto the field. Methods have been considered to prevent straw debris from flying up, but there is a problem in that it requires time and cost to install a diffusion member.

The present invention focuses on these problems and makes simple changes to the shape of the exhaust pipe to promote the diffusion of exhaust gas and weaken the blowing to the ground. The aim is to prevent this as much as possible.

[Means for solving problems]

In order to achieve the above object, the exhaust pipe structure for agricultural machinery according to the present invention has a pipe wall bent inward and outward in the radial direction at the tip opening end of the exhaust pipe led downward from the engine, so that the inside of the pipe is The present invention is characterized in that a protruding portion is formed that protrudes in the opposite direction, and the inward protrusion amount and circumferential width of the protruding portion are made larger toward the opening end.

The functions and effects of this characteristic configuration are as follows.

[Operation] That is, when the exhaust gas passing through the exhaust pipe hits the protruding part, it is divided into two parts and their paths are changed outward along the inclined inner surface of the protruding part. The exhaust gas that did not hit the protrusion is also influenced by the exhaust gas that has changed its course outward, and its course direction is disturbed, and as a result, the overall flow of exhaust gas becomes diffused.

Further, a structure for diffusing exhaust gas can be obtained simply by bending the opening end of the exhaust pipe, and other parts for diffusing the exhaust gas are not necessary.

[Effect of idea]

Therefore, according to the present invention, an exhaust diffusion structure can be obtained by simply bending the open end of the exhaust pipe inside and outside in the radial direction of the pipe without attaching a member such as a diffusion plate. The structure was simple and inexpensive.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 4, there is an engine 2 in the front bonnet 1 of the fuselage, a main clutch housing 3 integrally connected to the rear end of the engine 2, a fuel tank 4,
A radiator 5 and a cooling fan 6 are supported and equipped on a frame 13, and a transmission case 7 is provided at the rear of the fuselage to receive power transmission from the output shaft of the main clutch housing 3. Furthermore, a driving unit 8 is provided in the middle of the fuselage. An agricultural tractor is equipped with a lift arm 11 at the rear end of the body capable of driving up and down a working device such as a tiller, and a PTO shaft 12 for transmitting power to the working device. It is configured.

As shown in FIGS. 4 and 3, an oil cleaner 14 is installed at the front end of the engine 2, and the cylinder head 1
A muffler 16 is attached to the lateral side of 5.

The muffler 16 is composed of an inner case 16a for attachment to the engine 2 and an outer case 16b attached to the inner case 16a from the outside, and is attached to the engine 2 together with an extending flange 17 of the inner case 16a. As a result, the exhaust gas introduced from the engine 2 into the inner case 16a is further introduced into the outer case 16b, and then reaches the exhaust pipe 19 connected to the exhaust port 18 on the lower surface of the outer case 16b. There is.

As shown in FIGS. 1 and 2, the exhaust pipe 1
The lower part of the opening end of the distal end of 9 is made to protrude inwardly along the exhaust direction to form a chevron-shaped protrusion 20, and the inward protrusion amount h and circumferential width w of this protrusion 20 are set to about the same as the opening end. It is made to be large.

Therefore, a part of the exhaust gas discharged to the outside through the exhaust pipe 19 hits the protrusion 20 and changes its course outward, disturbing the direction of other exhaust gas. In other words, the exhaust gas that hits the protruding portion 20 is split into two directions, each changing its course in the inward protruding direction and in the circumferential width direction, and interfering with other exhaust gas that was discharged without any obstruction. together to diffuse the overall exhaust flow.

The protruding portion 20 may also be formed at the upper portion of the open end of the exhaust pipe 19.

Note that although numbers are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the exhaust pipe structure of an agricultural machine according to the present invention, in which Fig. 1 is a perspective view of the tip of the exhaust pipe, Fig. 2 is a sectional view thereof, and Fig. 3 is a front view of the engine.
FIG. 4 is a side view of the engine, and FIG. 5 is a side view of the entire agricultural tractor. 2...Engine, 19...Exhaust pipe, 20...Protruding portion, h...Inward protrusion amount, w...Circumferential width.

Claims (1)

[Scope of utility model registration request] At the open end of the exhaust pipe 19 led downward from the engine 2, the pipe wall is bent inward and outward in the radial direction to form a protrusion 20 that protrudes inward of the pipe. An exhaust pipe structure for an agricultural machine, in which the inward protrusion amount h and the circumferential width w become larger toward the open end side.