JPH0424901Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutter housing structure for a lawn mower.

[Conventional technology]

The cutter blade is housed in the circumferential wall of the cutter housing, and the front and rear wheels are supported by axle support parts integrally formed on the front, rear, left, and right sides of the circumferential wall. Lawn mowers that rotate cutter blades are in practical use. In view of weight reduction, moldability, cost, etc., cutter housings made of synthetic resin have been put into practical use.

[The problem that the idea aims to solve]

During use of a lawn mower, the circumferential wall of the cutter housing that houses the cutter blade may come into contact with obstacles such as trees or sand. It is desirable that

However, when the cutter housing is made of synthetic resin, the rigidity may be insufficient compared to the case where the cutter housing is made of metal such as aluminum alloy, and it is also inferior in terms of wear.

In addition, while in use, lawn mowers travel over uneven ground or slopes, forcing them to take various postures.
In that case, if a torsional load is applied to the cutter housing in the left and right direction due to the load from the front and rear wheels, the cutter housing made of synthetic resin will twist as a whole and will not accommodate the cutter blade. The peripheral wall of the cutter housing may also be deformed.

An object of the present invention is to provide a cutter housing structure for a lawn mower that has sufficient rigidity and wear resistance even in the above-mentioned cases, and can be made as light as possible.

[Means to solve the problem]

The structure of the present invention to achieve the above object is that a cutter housing that accommodates a cutter blade is formed of synthetic resin, an engine that rotationally drives the cutter blade is mounted on this cutter housing, and the cutter housing accommodates a cutter blade. In a lawn mower equipped with running wheels at the front and rear parts, the cutter housing includes a peripheral wall that accommodates the cutter blade, and axle support parts are integrally formed on the front and rear left and right sides of this peripheral wall, and the cutter housing has a peripheral wall that accommodates the cutter blade. The rear wheels are connected by a front axle and a rear axle that are supported through the left and right axle support parts, respectively, and metal reinforcing members are fixed to the left and right sides of the peripheral wall along the sides, and the reinforcing members are It is characterized in that the front and rear ends further extend in the front and rear and are fixed to the axle support portion.

〔Example〕

FIG. 1 is a perspective view of the lawn mower, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a bottom view of the cutter housing.

The lawn mower 1 includes a front wheel 3 and a rear wheel 4 on the left and right sides of the front and rear sides of a cutter housing 2 made of synthetic resin.
A vertical engine 5 is mounted in the center of the cutter housing 2, and a cutter blade 6 is housed in the cutter housing 2 below. The rear wheels 4 are driven by the engine 5, and the cutter blade 6 is driven by the engine 5.
is configured to be rotated in a horizontal plane. The engine 5 is covered with an engine cover 7, and a recoil starter pulley 8 is provided above the engine cover 7. A handle 9 extends rearward and upward on the left and right sides of the rear portion of the cutter housing 2, and the handle 9 is provided with a recoil starter operating knob 10, a brake lever 11, and a control lever 12. Also,
A grass bag 13 for storing cut grass is attached to the rear part of the cutter housing 2.

As shown in FIGS. 2 and 3, the cutter housing 2 includes a circular peripheral wall 14 that surrounds the cutter blade 6. The lower part of this peripheral wall 14 is open, and the upper part is closed by an upper wall 15 provided at the upper end of the peripheral wall 14. The center portion of the upper wall 15 is formed into a lower concave shape to form an engine mounting base portion 16, and a circular opening 17 is provided in the center portion of the engine mounting base portion 16. The engine 5 is placed on an engine mounting base 16, and a vertical crankshaft 18 is inserted through the opening 17 and hangs down, and the cutter blade 6 is fixedly installed at the lower end of the crankshaft 18. And again crankshaft 18
A discharge fan 19 is fixedly installed on the cutter blade 6, and the periphery of the fan 19 is covered with a circular inner cylinder 20 depending from the upper wall 15. In the engine 5, the cylinder 21 is oriented horizontally, and a cooling fan 22 is fixedly installed at the upper end of the crankshaft 18 extending in the vertical direction.
The surrounding area is covered with the engine cover 7 as described above. And the peripheral wall 14 of the cutter housing 2
A rear portion of the peripheral wall 14 is partially opened, and a discharge duct 23 is integrally provided at the rear of the peripheral wall 14 and extends rearward. A partition wall 24 that divides the discharge duct 23 into left and right sections is diagonally provided in the middle part of the discharge duct 23 in the width direction. The inside is formed into a scroll shape.

Further, the peripheral wall 14 of the cutter housing 2 has side ribs 27 extending outward at the lower portions of the left and right sides thereof.
be provided in one. Further, a front rib 28 extending forward is integrally provided at the front portion of the peripheral wall 14, and an upper rib 29 extending in the front-rear direction is also formed on the upper surface of the upper wall 15. The front rib 28 is connected to the left and right side walls 28.
The left and right side walls 28a are upright walls, and the upper wall 28b has a curved shape that extends downward toward the tip.

Therefore, when the engine 5 operates and the crankshaft 18 rotates, the cutter blade 6 and the discharge fan 19 are both driven to rotate, so that the cutter blade 6 mows the grass and the discharge fan 19 mowing the grass. transferred to the discharge duct 23,
Store the cut grass in the grass bag 13.

In the above configuration, the left and right front wheels 3 are connected by a front axle 30, and the front axle 30 is supported through an axle mounting boss 32 that is integrally provided on the left and right side walls 28a of the front rib 28. Similarly, the left and right rear wheels 4 are connected by a rear axle 31, and the rear axle 31 is provided integrally with the left and right rear side walls 33 that extend integrally below the exhaust duct 23 together with the exhaust duct 23 at the rear of the peripheral wall 14. The axle mounting boss portion 34 extends through and is supported.

A reinforcing member 35 is provided between the front axle 30 and the rear axle 31. That is, the reinforcing material 35a is fixed by appropriate fixing means such as bolts, rivets, welding, caulking, and fitting so as to cover the left and right sides of the outer peripheral surface of the peripheral wall 14 of the cutter housing 2, and this reinforcing material 35a is further A reinforcing member 35 extends integrally in the front and rear and extends to the axle mounting boss portion 32 of the front wheel 3 and the axle mounting boss portion 34 of the rear wheel 4.
b are fastened together. The reinforcing material 35 that covers the side surface of the peripheral wall 14 and extends to the front and rear axle mounting bosses 32 and 34 is made of plate material, pipe material, cross-sectional channel material, box cross-sectional material, etc., and is made of steel, aluminum alloy, etc. metals used. Further, the fixing method is not limited to separate attachment, but may also be integrally molded using double injection extension. Further, in the above example, the reinforcing material 35 is provided on the outside of the peripheral wall 14 and the side walls 28a, 33, but it may be provided on the inside.

[Effect of idea]

As explained above, the present invention provides the following effects.

Even if the wheels receive a load from the ground that would twist the cutter housing, the four wheels are connected by the front axle, rear axle, and left and right metal reinforcements to form a closed rigid body, so the composite It is possible to prevent the entire cutter housing made of resin from being torsionally deformed.

The left and right sides of the circumferential wall of the cutter housing that houses the cutter blade are reinforced with metal reinforcing materials, so even if obstacles such as trees or sand come into contact with the circumferential wall, the circumferential wall will not deform. Can prevent wear.

The cutter housing is made of synthetic resin.
Since metal reinforcing materials are fixed in only a few places, weight reduction can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of a lawn mower, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a bottom view of a cutter housing. 1 is a lawn mower, 2 is a cutter housing, 3 is a front wheel, 4 is a rear wheel, 5 is an engine, 6 is a cutter blade, 9 is a handle, 14 is a peripheral wall, 15 is an upper wall,
16 is an engine mounting base part, 23 is an exhaust duct, 27 is a side rib, 28 is a front rib, 28a is a front side wall, 30 is a front axle, 31 is a rear axle, 32,
34 is an axle mounting boss, 33 is a rear side wall, and 35 is a reinforcing member.

Claims (1)

[Scope of utility model registration request] A cutter housing containing a cutter blade is formed of synthetic resin, an engine for rotationally driving the cutter blade is mounted on the cutter housing, and running wheels are provided at the front and rear of the cutter housing for mowing lawns. In the cutter housing, the cutter housing includes a peripheral wall that accommodates the cutter blade, and axle support portions are integrally formed on the front and rear sides of the peripheral wall to protrude, and the left and right front wheels and rear wheels are arranged between the left and right axle support portions. A front axle and a rear axle are connected through the peripheral wall, and metal reinforcing members are fixed to the left and right sides of the peripheral wall along the sides, and the front and rear ends of the reinforcing members are further extended in the front and back to connect the axle to the axle. A cutter housing structure for a lawn mower characterized by being fixed to a support part.