JPS6316085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lawn mower equipped with a liquid-cooled engine.

Conventionally, lawn mowers have been equipped with air-cooled engines to reduce weight as much as possible, but these air-cooled engines are equipped with a fan for cooling.
The cut grass or grass is sucked in with cooling air, and the cooling air is passed through an air intake, for example.
Clogging occurred between the fins of the cylinder head and cylinder block, reducing the cooling effect of the engine and causing problems such as overheating and seizure. Therefore, lawn mowers equipped with air-cooled engines require constant cleaning.

In addition, air-cooled engines have a problem in that they are very noisy due to cooling fan noise, fan noise, etc.

Therefore, it is possible to adopt a liquid-cooled engine that does not require the use of a cooling fan, which can cause such problems, but in that case, a radiator for dissipating the heat of the coolant, such as a coolant, is required.
There was a sense of regret that the trend was toward larger sizes.

The present invention has been made in view of this point, and focuses on the fact that the deck member that covers the rotary blade that cuts grass and grass has a large heat capacity and good heat dissipation.
By installing a radiator on the deck member, the above-mentioned conventional problems are solved, and the capacity of the radiator can be reduced due to the heat dissipation properties of the deck member, and the lawn is equipped with a liquid-cooled engine that is smaller and lighter. The main purpose is to provide mowers.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the drawings.

<Embodiment 1> In FIG. 1, 1 is a lawn mower, which is equipped with a water-cooled engine 2. A crankshaft 3 of this water-cooled engine 2 is disposed vertically, and a rotary blade 4 is attached and fixed to the lower end of the crankshaft 3 with bolts 5. The rotary blade 4 has a cutter-like function for cutting grass and grass, and a blower-like function for blowing away the cut grass and grass.

6 is a shade-shaped deck member, which is used for water-cooled engine 2.
The rotary blade 4 is attached and fixed to the lower part of the rotary blade 4 in the form of a skirt around the crankshaft 3, and covers the rotary blade 4 therein. This deck member 6 is made of aluminum alloy die-casting or sheet metal.
Since it is formed relatively large, its heat capacity is considerably large.

Reference numeral 7 denotes a cooling water passage, in which a water pump 8 is interposed, and a radiator 9 is connected by the water pump 8.
The cooling water cooled by the radiator is forced to circulate through the water pump 8, water jacket 10, and back to the radiator 9.

The radiator 9 is constructed by fixing an annular member 11 having a hat-shaped cross section to the lower side of the upper plate portion 6a of the deck member 6. Further, the radiator 9 has a flat shape so that cut grass or grass does not get entangled between the radiator 9 and the rotary blade 4. In other words, a sufficient gap exists between the lower surface of the radiator 9 and the cutting edge of the rotary blade 4.

The water pump 8 is connected to the rotating shaft 1 of the blade 12.
A driven pulley 13 is fitted and fixed to 2a, and the driven pulley 13 is linked via a drive belt 15 to a drive pulley 14 that is fitted and fixed to the upper end of the crankshaft 3. Therefore, when the water-cooled engine 2 is in operation, the water pump 8 is driven and the cooling water is forced to circulate.

In addition, 16 is a cylinder head, 17 is a cylinder block, 18 is a piston, 19 is a connecting rod, 20 is a spark plug mounting hole (the spark plug is omitted), and 21 is a recoil. It's a starter.

With the above configuration, in the radiator 9, the amount of heat of the cooling water is conducted to the deck member 6 having a large heat capacity, and is radiated into the atmosphere via the deck member 6, and the rotary blade 4, which the radiator 9 faces, Forced cooling is performed by the blower function. That is, due to the synergistic effect of the heat dissipation effect by the deck member 6 and the cooling effect by the rotary blade 4, efficient cooling is achieved.

Further, unlike an air-cooled engine, there is no risk of generating noise such as cooling fan noise or fan noise.

In the above embodiment, the radiator 9 is annular, but since the water-cooled engine 2 has a horsepower of about 3 to 4 and is small, the radiator may have a simple shape as shown in the second embodiment below. It doesn't matter if it happens. In other words, regardless of the shape of the radiator, as long as the radiator is mounted on the deck member 6, a sufficient cooling effect can be obtained due to the heat dissipation effect of the deck member 6.

<Embodiment 2> In FIG. 2, 31 is a box-shaped radiator, which is formed by fixing a box-shaped member 32 above the upper plate portion 6a of the deck member 6. The other configurations are the same as in the first embodiment.

<Embodiment 3> In FIG. 3, 41 is a radiator, which is stacked on top of the deck member 6. The other configurations are the same as in the first embodiment.

Since the present invention is constructed as described above, the radiator has a high cooling capacity due to the heat dissipation effect of the deck member, and the capacity of the radiator can be reduced, so the overall size and weight are comparable to those equipped with an air-cooled engine. In addition, since it uses a liquid-cooled engine, the cooling effect of the engine does not decrease due to clogging of grass and grass, and there is no large noise such as cooling fan noise or fan noise. It has various excellent effects.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is an overall configuration diagram of a lawn mower according to a first embodiment, FIG. 2 is an overall configuration diagram of the lawn mower according to a second embodiment, and FIG. 3 is an overall configuration diagram of the same. It is. 1...Lawn mower, 2...Water-cooled engine, 4...
...Rotary blade, 6...Deck member, 7...
Cooling water passage, 9...Radiator, 31...Radiator, 41...Radiator.

Claims (1)

[Scope of Claims] 1. A device comprising a liquid-cooled engine and provided with a shade-shaped deck member that covers rotary blades rotated by the liquid-cooled engine, wherein a radiator is provided in a coolant passage of the liquid-cooled engine. A lawn mower equipped with a liquid-cooled engine, characterized in that the radiator is installed in a deck member. 2. A lawnmower equipped with a liquid-cooled engine according to claim 1, wherein the radiator is annular and installed below the deck member. 3. A lawnmower equipped with a liquid-cooled engine according to claim 1, wherein the radiator is box-shaped and installed above the deck member. 4. A lawnmower equipped with a liquid-cooled engine according to claim 1, wherein the radiator is stacked on top of the deck member.