JPH0643455Y2 - Lawn mower exhaust system structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention arranges the muffler body of the engine below the front end of the machine body, and provides a muffler cover for covering the muffler body from below to cool the engine. The present invention relates to an exhaust device structure of a lawn mower in which exhaust air flows in the muffler cover.

[Conventional technology]

Conventionally, the exhaust device structure of the lawn mower mentioned above has an exhaust pipe outlet arranged laterally of the machine body, a muffler cover covers only the lower surface of the muffler body, and escapes cooling exhaust air of the engine guided to the muffler body. The shape was such that a large number of large air outlets were opened. (Reference cannot be given.) [Problems to be Solved by the Invention] According to the above-mentioned conventional technique, a part of the hot exhaust gas discharged from the exhaust pipe hits the front wheel and a part of the hot exhaust gas is directed toward the ground. Could be sprayed. In addition, the cooling exhaust air of the engine, which became hotter by cooling the muffler body, is also easily discharged to the ground through the exhaust port of the muffler cover and the gap between the muffler cover and the muffler body on the side of the muffler body. It was something that was done.

Therefore, at the time of lawn mowing work, such as in the idling state,
If you keep the aircraft stopped at the same position with the engine running for a long time, the grass under the muffler will die due to the heat of the hot exhaust gas blown toward the ground and the heat of the cooling exhaust air. There was a problem.

An object of the present invention is to prevent the above-mentioned problems from occurring by devising an exhaust device structure of a lawn mower.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an exhaust device structure in the state described above, in which an exhaust pipe of the muffler main body is projected from a side plate of the muffler cover to prevent exhaust air from being blown to the front wheels and the ground. The exhaust outlet is set in the direction, and the exhaust port is formed in the front portion of the muffler cover so that the cooling exhaust air flowing inside the cover is discharged only forward.

[Action]

According to the above configuration, there is no possibility that the high-temperature exhaust gas discharged from the muffler body will be blown onto the ground, and the high temperature cooling exhaust air will not be directly discharged toward the ground.

[Effect of device]

Therefore, even if the muffler body is stopped by using the engine cooling air for a long time while the lawn mower keeps the engine running on the lawn surface and the aircraft is stopped at the same position for a long time, We were able to prevent the problem that the grass of the plant would die.

Further, even if the cooling exhaust air discharged forward reaches the ground with a gentle downward angle due to diffusion, the temperature of the exhaust air is sufficiently lowered at that time, so that the lawn is not killed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings when applied to a riding lawn mower.

In FIG. 4, an engine (1) is provided in the front part of the machine body, a muffler body (2) and a muffler cover (3) are arranged below the front end part of the machine body, a driving section (4) is provided in the rear part, and a lower abdomen part of the machine body is provided. A riding lawn mower fitted with a mower (5) is shown.

As shown in FIG. 1, the output shaft of the engine (1) is arranged on the vertical axis, and the engine (1) is cooled by a cooling fan (6) mounted on the upper end of the engine (1). At the same time, the cooling exhaust air after cooling the engine is made to flow in the muffler cover (3).

The muffler body (2) has a cylindrical shape and is attached to a bracket (8) provided at the front end of the engine (1) mounted on the body frame (7). Further, as shown in FIG. 3, a bumper (9) having an open rearward U-shape in plan view is provided at the front end of the machine body frame (7) so as to surround the muffler body (2).

The front support plate (10) in the form of a strip is welded horizontally along the inner surface of the front end portion of the bumper (9) while the front vehicle bearing (11) provided at the front end of the machine frame (7) A nut (12) is welded to the rear side of the hole opened in the side surface.

Then, a muffler cover (3) is attached by bolting so as to cover the muffler body (2) from below over the support plate (10) and the nut (12).

Further, on the front support plate (10), an angle-shaped cover (14) having a length that extends over the entire left and right sides of the frame (7) along the inner side of the front end of the frame (7) is provided via a flange metal fitting (15). It is installed by tightening bolts.

As shown in FIGS. 2 and 3, the muffler cover (3) is
The muffler body (2) is made of sheet metal integrally covering the front, rear, left and right sides, and the lower surface. The right side plate (3r) is laterally projected so as not to interfere with the front wheel (13) in a side view. A hole (17) for the exhaust pipe (16) of the muffler body (2) is formed, and an exhaust port (18) for discharging the cooling exhaust air from the cooling fan (6) only to the front is formed on the front surface. , (18) are provided.

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

[Brief description of drawings]

The drawings show an embodiment of the exhaust system structure of a lawn mower according to the present invention. Fig. 1 is a side view of a main part, Fig. 2 is a sectional front view of the main part, and Fig. 3 is an exploded perspective view showing attachment of a muffler cover. FIG. 4 is a side view of the riding lawn mower. (2) …… Muffler body, (3) …… Muffler cover,
(13) …… Front wheel, (16) …… Exhaust pipe, (18) …… Exhaust port, (3r) …… Side plate.

Front page continuation (72) Inventor, Yoji Fujiwara, 64, Ishizukita-machi, Sakai City, Osaka Prefecture.

Claims (1)

[Scope of utility model registration request] 1. A muffler body (2) for an engine is arranged below a front end of an airframe, and a muffler cover (3) for covering the muffler body (2) from below is provided so that the cooling exhaust air of the engine is An exhaust device structure of a lawn mower, which is configured to flow in a muffler cover (3), wherein an exhaust pipe (16) of the muffler body (2) is provided so as to project from a side plate (3r) of the muffler cover (3). , The exhaust outlet is set in a direction in which the exhaust is not blown to the front wheels (13) and the ground, and the cooling exhaust air flowing inside the cover (3) is discharged only forward in the front part of the muffler cover (3). Exhaust structure for lawn mowers that has an exhaust vent (18) formed as described above.