JPH0627794Y2 - Lawn mower engine exhaust system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an engine exhaust device of a traveling work type lawnmower.

<Prior Art> Conventionally, in a traveling work type lawnmower, a lawn mowing device is arranged on the lower side of the vehicle, and an engine is arranged in the hood of the vehicle.
The lawn mower was driven while the vehicle was driven by the power of the engine, and the muffler of the engine was placed under the hood.

<Problems to be solved> However, with lawnmowers, the grass and dead grass cut off during the work fly up to the ground surface as small pieces, but the muffler of the engine is placed under the hood. In the configuration, since the distance between the ground surface and the muffler is narrow, small pieces of grass that rise near the ground surface are likely to come into contact with the surface of the muffler, and when the surface of the muffler is hot. There is a problem that cut grass and small pieces of hay may become sparks and scatter.

The present invention has been made paying attention to such a point, and makes it difficult for small pieces of grass flying near the ground surface to come into contact with the surface of the muffler, and small pieces of grass contact the surface of the muffler. Even if something happens, the purpose is to prevent the small pieces from burning out.

<< Means for Solving the Problems >> In order to achieve the above object, in the present invention, the engine installed in the hood of a lawn mower is composed of a vertical axis air-cooled engine, and a muffler stay is provided at a lower portion of the head block of the engine. The muffler is arranged in a substantially horizontal position via the, the cowling that covers the cooled portion of the engine is formed up to the engine lower surface portion, and a part of the cowling facing the muffler is cut out to form the cooling air blowing portion, A part of the cooling air generated by the cooling fan is made to hit the muffler, and the muffler exhaust gas discharge pipe is led out from the lower end of the side of the cowling and the end surface of the muffler stay that corresponds to the direction in which the muffler exhaust gas discharge pipe is led out. The guard plate is projected so as to cover the root and the upper part of the exhaust emission pipe to prevent the surface of the muffler from rising in temperature and to cut it. The grass and dead grass are made hard to adhere to the surface of the muffler.

<Operation> In the present invention, the engine installed in the hood of the lawn mower is composed of a vertical axis air-cooled engine, and the muffler is arranged in a substantially horizontal position below the head block of the engine via a muffler stay, so that the engine A cowling that covers the cooled part is formed up to the bottom surface of the engine, a part of the side of the cowling facing the muffler is cut out to form a cooling air outlet, and a part of the cooling air blown by the cooling fan is formed in the muffler. Since it is configured to hit the surface of the muffler, even if the grass and dead grass cut off during work become small pieces and rise up near the ground surface, a part of the engine cooling air is blown toward the surface of the muffler. While lowering the temperature, it blows off small pieces of grass or dead grass floating around the muffler to prevent the small pieces of grass or dead grass from adhering to and depositing on the surface of the muffler.

In addition, the guard plate is provided so as to project from the lower end portion of the side surface of the cowling and the end surface of the muffler stay corresponding to the outlet direction of the exhaust discharge pipe of the muffler so as to cover the outlet base portion of the exhaust discharge pipe of the muffler and the upper portion of the exhaust discharge pipe. As a result, the guard plate covers the outlet of the exhaust gas discharge pipe where it is easy for the temperature to rise and small pieces of grass and dead grass to accumulate.Therefore, small pieces of grass and dead grass accumulate and burn on the exhaust gas discharge pipe. I will not put it out.

<Embodiment> The drawings show an embodiment of the present invention. FIG. 1 is an exploded perspective view showing the main part of the exhaust device according to the present invention, and FIG. 2 is a riding lawn mower equipped with the exhaust device according to the present invention. FIG. 3 shows a schematic side view of the front part of the vehicle body of the lawn mower.

As shown in FIG. 2 and FIG. 3, this lawnmower has front steering wheels (1) and rear driving wheels (2), and a vertical axis air-cooled engine (3 ) Is mounted, and the driver's seat (4) is mounted on the rear part of the vehicle body and the lawn mowing device (6) is attached to the lower part of the rear part of the vehicle (5) so that it can be moved up and down. The power from the projected output shaft (7)
The upper pulley (8) transmits the belt to a traveling mission case (not shown) at the rear of the vehicle body, and the lower pulley (9) transmits the belt to the lawnmower (6).

The engine (3), along with its
The muffler (11), which is covered with (0) and is drawn downward from the engine (3), is a protective cover provided at the lower part of the front end of the vehicle body.
Covered with (12).

As shown in FIGS. 1 and 4, the engine (3) has a cooling fan (14) arranged on the upper side of a crankcase (13), and the outer peripheral portion of the cooling fan (14) and the cylinder block ( 1
5) Cowling to surround the head block (16)
(17) is attached. The cowling (17) is formed so as to cover a part of the lower surfaces of the cylinder block (15) and the head block (16). And a cooling fan
The cooling air generated in (14) flows downward in the cowling (17) through the cylinder block (15) and the head block (16).

Muffler (11) derived downward from the engine (3)
Is arranged in a substantially horizontal position below the head block (16) of the engine (3), and the lower surface of the cowling (17) is located between the muffler (11) and the head block (16). I am doing it. Then, the cowling (17) muffler (1
The part facing 1) is partially cut out, and the cut out part is formed in the cooling air blowout part (18) toward the muffler (11). Therefore, a part of the engine cooling air is blown around the muffler (11) from above, which prevents the muffler (11) surface from cooling and prevents the muffler surface from becoming highly heated. Small pieces of turf and hay that have been removed do not adhere to the surface of the muffler (11).

The muffler (11) is suspended and supported by a muffler stay (19) that extends from the engine head block (16), and the exhaust introduction pipe (20) is connected to the muffler (1) from the peripheral surface of the muffler (11).
Exhaust gas discharge pipes (21) extend from one end face of (1). A guard plate (23) that covers the upper portion of the exhaust gas discharge pipe (21) is projectingly provided on an end face portion (22) of the muffler stay (19) corresponding to the exhaust gas discharge pipe leading direction. Also, cowling (1
The guard plate (24) is led out from the lower wall portion that covers the lower surface of the head block in (7) toward the exhaust gas discharge pipe leading direction.

In the exhaust system configured as described above, a part of the engine cooling air is blown from around the muffler (11) from above, so that the surface of the muffler (11) is cooled and the muffler surface is highly heated. In addition to preventing it, cut pieces of grass and dead grass do not adhere to the surface of the muffler (11), and the exhaust emission pipe (21) that is directly exposed to the outside as a high temperature part
Derived from the muffler (11) and the exhaust emission pipe (2
Since the upper part of 1) is covered with the guard plates (23) (24), small pieces of cut grass or dead grass adhere to the surface of the muffler (11), or on the outlet root of the exhaust gas discharge pipe (21). It will not be deposited.

<Effect> The engine installed in the hood of the lawn mower is composed of a vertical axis air-cooled engine, and the muffler is placed in a substantially horizontal position below the head block of the engine via a muffler stay, and the engine is cooled. A cowling that covers the part is formed up to the lower surface of the engine, a part of the side of the cowling that faces the muffler is cut out to form a cooling air outlet, and a part of the cooling air blown by the cooling fan is applied to the muffler. As a result, even if the grass and dead grass cut off during the work become small pieces and rise to the ground surface, part of the engine cooling wind blows toward the surface of the muffler, and the temperature of the muffler surface is changed. As it descends, it blows away small pieces of grass and dead grass floating around the muffler, so that small pieces of grass and dead grass do not adhere to and accumulate on the surface of the muffler and are cut off. It is possible to prevent burned grass and dead grass from burning out.

Further, since the guard plate is provided so as to project from the lower end portion of the side surface of the cowling and the end surface of the muffler stay corresponding to the direction in which the exhaust emission pipe of the muffler is led out, the guard plate is provided so as to cover the extraction root portion of the exhaust emission pipe and the upper portion of the exhaust emission pipe. , Since the exhaust gas exhaust pipe lead-out part will be covered with a guard plate because the temperature tends to be high and small pieces of grass and dead grass will be accumulated, small pieces of grass and dead grass will accumulate and burn out on the exhaust gas discharge pipe. There is no.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an exploded perspective view showing a main part of an exhaust device according to the present invention, and FIG. 2 is an overall perspective view of a riding lawn mower equipped with the exhaust device according to the present invention. , Third
FIG. 4 is a schematic side view of the front part of the vehicle body, FIG. 4 is a schematic plan view of the front part of the vehicle body, and FIG. 5 is a side view of the engine. 3 ... Engine, 5 ... Vehicle, 6 ... Lawn mower, 10 ...
(5) Bonnet, 11 …… (3) Muffler, 14 …… Cooling fan, 16 …… (3) Head block, 17 …… (3) Cowling, 18 …… Cooling air outlet, 19 …… Muffler stay, 21 ……
Exhaust gas discharge pipe, 23/24 ... Guard plate.

Claims (1)

[Scope of utility model registration request] 1. A lawn mowing device (6) is disposed below a vehicle (5), an engine (3) is disposed in a hood (10) of the vehicle (5), and the power of the engine (3) is used. Lawn mower (6) while running the vehicle (5)
In the engine exhaust device of the lawn mower, which is configured to drive the engine, and the muffler (11) of the engine (3) is disposed under the hood (10), the engine ( 3) is composed of a vertical axis air-cooled engine, and the head block (1
The muffler (11) is placed in a substantially horizontal position in the lower part of (6) through the muffler stay (19), and a cowling (17) that covers the cooled portion of the engine (3) is formed up to the lower surface of the engine. ), A part of the side facing the muffler (11) is cut out to form a cooling air outlet (18), and a part of the cooling air generated by the cooling fan (14) is applied to the muffler (11). The exhaust base of the exhaust discharge pipe (21) of the muffler from the lower end of the side face of the cowling (17) and the end face of the muffler stay (19) corresponding to the direction of discharge of the exhaust discharge pipe (21) of the muffler (11). Guard plate (23) (2
4) The exhaust system of the lawn mower engine