JP2562511B2 - Working part structure of work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is arranged in the engine bonnet at the front of the machine body such that the cylinder of a vertical axis type engine faces forward and The present invention relates to a driving part structure of a work vehicle in which a muffler is disposed in a recumbent position at a lower position.

[Conventional technology]

The structure of the driving part of the work vehicle of this type is shown in Japanese Patent Application No. 1-134056 filed by the present applicant. The muffler was located at the lower front end of the engine bonnet where the outside air is relatively easy to hit, and was laid down in consideration of the ground clearance and capacity.

[Problems to be Solved by the Invention]

In the prior art, by arranging the vertical axis type engine forward, the engine bonnet can be made into a front constricted shape in which the front side is small in both left and right and height, and the turf surface can be visually recognized from the driving section. There is an advantage that it is easy to do. With this structure, the space inside the engine bonnet tends to be filled up with the engine and its accessories, and for this reason, an exhaust outlet is provided at the bottom surface of the cylinder to exhaust the muffler located outside the bonnet near and below the cylinder. The pipes were in short-circuit communication with each other, and the muffler was rationally arranged while forming a compact engine bonnet.

However, the muffler capacity tends to be insufficient in the above structure, and there is room for improvement in terms of reducing exhaust noise.

An object of the present invention is to solve the above-mentioned inconvenience by devising the structure of the driving part.

[Means for solving the problem]

The present invention arranges a vertical axis type engine in a state in which a cylinder portion faces forward in an engine hood of a front portion of a machine body, and a first muffler communicated with an exhaust outlet formed in a lateral side surface portion of the cylinder portion, A second muffler on the lower side of the exhaust flow direction is provided, the first muffler is arranged at a position lateral to the cylinder part on the exhaust outlet side in the engine bonnet, and the second muffler is arranged outside the engine bonnet. It is characterized in that it is arranged in a recumbent posture at a position below the part.

[Work]

To reduce the exhaust noise, it is sufficient to increase the muffler capacity.For example, when the muffler is projected downward to increase the capacity, when the ground clearance is insufficient and the muffler is used as a tractor, the lower surface of the muffler is planted. There is a risk of heat mortality due to being close to. However, it is not possible to secure a cohesive space where a large muffler can be additionally set in the enn bonnet.

Therefore, the method of the present application is not a means for providing a single large muffler, but a means for increasing the capacity by the sum of two mufflers. In other words, by arranging the first muffler beside the cylinder inside the enn bonnet and the second muffler below the cylinder outside the enn bonnet (which is the conventional installation position), the effective use of a narrow space can be achieved. While increasing the total muffler capacity.

Therefore, the exhaust noise can be reduced, the first muffler on the hot side is arranged inside the bonnet, and the second muffler for reducing heat is placed outside the bonnet, and this second muffler is not larger than the conventional one. Therefore, the heat effect on the turf will not be worse than before.

〔The invention's effect〕

As a result, by dividing the muffler and making effective use of space, it is easy to visually recognize the turf surface and work well, while following the front constricted engine bonnet, while reducing the volume of the muffler without lowering the position. It was possible to provide a work vehicle that can be increased in number, reduces exhaust noise, and has an improved riding feeling.

〔Example〕

FIG. 3 shows a front portion of a lone tractor which is an example of a work vehicle. Inside the engine bonnet (1), a vertical axis type engine (2) is arranged with its cylinder portion (3) facing forward, and at the position below the cylinder portion (3) and in the front side, a cylindrical type engine (2) is arranged. Main muffler [equivalent to the second muffler]
(4) is disposed in a recumbent position.

As shown in FIG. 1, the exhaust outlet (5) of the cylinder part (3) is provided on the right side surface of the cylinder part (3),
The exhaust outlet (5) and the main muffler (4) are communicatively connected to each other through a sub-muffler [corresponding to the first muffler] (6) which is cylindrical and arranged in a forward tilted manner. Since the sub muffler (6) is attached and fixed to the cylinder portion (3) and the main muffler (4) is attached and fixed to the front vehicle bearing base (7), as shown in FIGS. 2 (a) and 2 (b). The connecting pipe (8) of the main muffler (4) and the connecting pipe (9) of the sub muffler (6) are connected via a flexible joint structure (10).

As shown in FIG. 3, the sub muffler (6) is arranged inside the engine bonnet 1, but the main muffler (4) exists below the engine bonnet (1), that is, outside the engine bonnet (1). It is what

A carburetor (11) is arranged at a position on the left lateral side of the cylinder part (3), and an intake inlet (12) and an exhaust outlet (5) of the cylinder part (3) to which the carburetor (11) is attached.
And are arranged in a straight line connecting the left and right. Further, both the main muffler (4) and the sub muffler (6) have a cylindrical shape that does not easily resonate, and the generation of shell noise (transmitted sound from the muffler body) is minimized.

[Another embodiment]

The drive part structure of the present invention may be applied to an agricultural tractor or a rice transplanter.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a prime mover structure of a work vehicle according to the present invention. FIG. 1 is a front view of a main part showing the structure, and FIGS. 2 (a) and 2 (b) show a muffler and a sub muffler, respectively. FIG. 3 is a side view of the front part of the lawn tractor, showing an assembly procedure showing the connection structure, a sectional view of the assembled state, and FIG. (1) …… Engine bonnet, (2) …… Engine,
(3) …… Cylinder part, (4) …… Second muffler,
(5) …… Exhaust outlet, (6) …… First muffler.

Claims (1)

(57) [Claims] 1. A vertical axis type engine (2) having a cylinder part (3) facing forward is arranged in an engine bonnet (1) at the front part of the fuselage, and a lateral side surface part of the cylinder part (3) is arranged. A first muffler (6) communicating with the formed exhaust outlet (5) and a second muffler (4) on the lower side in the exhaust flow direction thereof are provided, and the first muffler (6) is connected to the engine. The second muffler (4) is arranged inside the bonnet (1) at a position lateral to the cylinder part (3) on the side where the exhaust outlet (5) is present, and the second muffler (4) is arranged outside the engine bonnet (1). 3) The structure of the driving part of the work vehicle, which is arranged in a recumbent position in the lower position.