JPH0323054Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a soundproofing device for a lawnmower.

Conventionally, lawn mowers are known that include a rotary lawn mowing blade and a housing that covers the blade from above, and the blade is rotationally driven by an engine mounted on the upper surface of the housing, for example.
In this type of lawn mower, the wind noise generated by the blade is the biggest noise source, and the housing is
When the housing is made of a press-molded thin plate of material, approximately 1/2 of the noise is transmitted through the housing and emitted to the outside.

The purpose of the present invention is to provide a soundproofing device that suppresses transmitted sound from the housing and reduces the noise level during operation of a lawnmower. A lawn mower comprising a housing that covers from above,
The blade is formed into a mown grass type having a twisted portion curved upward at the rear in the rotational direction, and a resin inner housing is attached to the housing along the inner surface thereof. .

The invention will now be described with reference to illustrated embodiments.

In the drawings, reference numeral 1 denotes a housing that covers a rotary lawn mowing blade 2. The housing 1 is made of a press-molded product made of SP material, for example, and has an engine mount part 3 at the center of its upper surface. The blade 2 is configured to be rotationally driven by an engine 4 mounted on the blade 2, and the blade 2 has a twisted portion 2 curved upward at the rear in the rotational direction.
The grass cut by the blade 2 is formed into a mowing type having a shape of 1, and the grass is passed through a wind guide passage 6 in the housing 1 that is connected to a grass blowing part 5 that is integral with the housing 1 and extends diagonally rearward and upward. It was designed to be stored in bag 7 behind it.

In the drawings, reference numeral 8 indicates wheels provided at the front and rear of the housing 1, and the rear wheels 8 are connected to the engine 4 via a transmission mechanism (not shown) to construct a self-propelled lawn mower.

Although the above is not particularly different from the conventional one, according to the present invention, an inner housing 9 made of resin is attached to the inner surface of the housing 1 as shown in FIG.

To explain this in more detail, the inner housing 9 is either integral or divided and can be attached entirely or partially to the air guide passage section 6 including the grass blowing section 5. As shown in the figure, it can be fastened with screws 10 or grommets, etc. as desired.

As described above, according to the present invention, the rotary lawn mowing blade 2 is formed into a mowing type having an upwardly curved twisted portion 2a at the rear in the rotating direction, and therefore a housing 1 that covers the rotary lawn mowing blade from above. The grass clippings and wind can be circulated inside the housing 1 to allow for smooth discharge of the grass clippings, and since the inner housing 9 made of resin is installed inside the housing 1 along its inner surface, the blade The wind noise of No. 2 is absorbed by the inner housing 9 and the wind noise is absorbed by the steel plate housing 1.
The transmittance to the outside is reduced, the noise level during operation is reduced, and the inner housing 9 improves the ability to guide the grass clippings that are blown onto the inner housing, compared to a steel plate housing, so that the grass can be conveyed quietly and smoothly. It has the effect of being transported to

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a lawn mower equipped with the device of the present invention, and FIG. 2 is a cutaway side view of the housing portion thereof. 1...Housing, 2...Blade, 9...Inner housing.

Claims (1)

[Scope of utility model registration request] In a lawn mower comprising a rotary lawn mowing blade and a housing that covers the blade from above, the blade is formed into a mowing type having a twisted portion curved upward at the rear in the rotation direction, and the housing is provided with a lawn mower. A soundproofing device for a lawnmower, characterized by having a resin inner housing attached along the inner surface of the lawnmower.