JPS59224608A - Power mower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a power lawn mower equipped with an engine having a vertical crankshaft.

2. Description of the Related Art Power lawn mowers are in practical use, which are equipped with an engine and use the engine as a power source to rotate a cutter blade in a horizontal plane, and are driven by the power or by hand.

As for the engine of the above-mentioned power lawn mower, when the crankshaft is placed horizontally, the direction of rotation differs between the cutter blade and the cutter blade, which rotates in the horizontal plane, so there is a direction change transmission between the cutter blade and the crankshaft. This is not desirable because it requires a mechanism, which leads to a complicated structure, an increase in the number of parts, and an increase in size.

Therefore, if a so-called vertical engine with a vertical crankshaft is used, since the crank/gift is vertical, the cutter blade can be connected directly to the lower end of the crank/gift, and there is no need for a direction change or transmission mechanism. The inconvenience can be resolved.

By the way, conventional lawn mowers of this type have wheels, a grass storage bag attached, and the engine is rigidly mounted and connected to the cutter blade housing, which is equipped with a handle for operation. This was transmitted to the steering wheel through the air, making it undesirable for the operating feel. In particular, in vertical engines, the sills are installed horizontally, facing front and rear or left and right, and when the crankshaft rotates in the horizontal plane, the engine's primary inertia is generated in the front and rear or left and right directions, which causes vibrations in the crankshaft. This signal is transmitted to the steering wheel through the air, impairing the operating feel, and improvements are desired.

The present invention has been made to improve the above-mentioned problems, and its purpose is to isolate engine vibrations from the housing as much as possible, suppress transmission of vibrations to the housing and the handle as much as possible, It has an excellent operating feel and is also advantageous in terms of noise prevention.
It is an object of the present invention to provide a power lawn mower that can accomplish the above with a simple configuration.

In order to achieve the above objects, the present invention directly connects a cutter blade that rotates in a horizontal plane to the lower end of a vertical engine with a horizontal cylinder and a vertical crankshaft, covers the cutter blade, wheels,・The engine is mounted and supported on the housing through an elastic body arranged outward in the circumferential direction of the crankshaft, with the engine facing onto the housing equipped with a steering wheel, etc., and the housing and engine are aligned with respect to the crankshaft axis. The gist is that they are connected by supporting shafts arranged orthogonal to each other.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view of a power lawn mower 1, where 2 indicates a crank which also serves as the machine body, and wheels 3 are all equipped at the four corners, and the wheels 3 are driven by engine power. It may also be configured with wheels so that it can be moved by manual operation.

On the rear part of the housing 2, there is provided a handle 4 extending rearward and upwardly, and in the embodiment, a grass storage bag 5 is disposed on one side of the handle 4, and the upper part of the rear end of the bag is attached to a handle. It protrudes from the upper part of the side part, and the front end is connected to a cut grass discharge part 201 that projects above the peripheral part 9 of the crank 2.

A power unit 6 is disposed on the housing 2, the outside of which is covered with a cover 601 in the figure, and a fuel tank 602 is provided at the rear of the power unit.

FIG. 2 is a longitudinal cross-sectional view showing the main parts of the mounting structure between the engine 7 and the housing 2, which form the main body of the power unit 6. is arranged horizontally, and the crankcase 702 is connected to the base of the cylinder part 7010 so as to face downward.The figure shows a cantilevered crankshaft type, so the upper end of the crankcase 702 has a diagonal joint. -703, and the crankcase 702 is provided with a hanging extended case part 704 f that protrudes downward, and the lower end of the case part 704 has a large diameter mounting flange part 7.
05 is formed. Such a case part 704 faces above the central part of the crank 2, a through hole 202 is provided vertically in the central part of the crank 2, a skirt part 204 is suspended from the periphery of the earthen wall 203, Inside this, double partition walls 205 and 206 are provided to discharge part 201 for cutting grass.
guide duct) 207'.

As is known, a piston (not shown) is fitted into the cylinder portion 701 so as to be able to slide in the horizontal direction, while a crankshaft 706 is housed in the crankcase γ02 and the case 704 so as to be vertically arranged. , crankshaft γ
06 is a cantilever type, and a pin part provided near the radially outer end of the upper end web 707 is connected to the piston via a connecting rod 708, and a crankshaft shaft part 709 hanging perpendicularly from the web 707 is vertically spaced apart. Bearing 7 installed so as to
10.710 is supported.

The lower end 711 of the shaft portion 709 of the crankshaft 706 is suspended below the flange portion 705 of the case 705, and the lower end is inserted into the longitudinal hole 202 of the crank via a joint shaft 712 that hangs vertically. The blade 8 is connected to a holder 801 of the cutter blade 8 housed in the lower part of the blade 2, so that the blade 8 is rotated by the engine power in a horizontal plane to perform lawn mowing work.

In the above, an elastic body, specifically a mount rubber 9, is interposed between the central part of the earth wall 203 of the crank 2 and the flange part 705, and the earth wall 203 of the housing It is connected to a flange portion 705 that forms the mounting base of the engine 7 facing above. For example, the upper end of the Ranoku-9 can be attached to the lower surface of the periphery 9 of the flange part γ05 of the engine 7 using sintering material, etc., and the seat plate provided at the lower end can be attached to the earthen wall of the housing 2. , or vice versa, by providing seat plates on the top and bottom of the rubber and connecting them to the flange portion 705 and the no-using earth wall 203, respectively, and the engine 7'! r housing 2
It is mounted and supported on the top via an elastic body 9. Rubber 9
A plurality of them may be provided radially around the crankshaft shaft portion 709, or a ring-shaped one may be provided concentrically around the shaft portion 709.

A mounting bracket part 713 is provided at a symmetrical position on the circumference of the flange part 705 in a downwardly protruding manner.
A bracket part 205 that wraps outward is set up, and the bottle 10 is completely passed through between the bracket parts 713 and 205, and both are pivotally supported. The bin 10 is provided horizontally so as to be orthogonal to the axis of the crankshaft shaft portion 709.

Next, its effects will be explained in detail.

The engine 7 configured as shown in FIG.
It is supported by a shaft.

Therefore, the direction of the primary inertia force generated from the engine is determined by bin 1.
It is generated so as to act around 0, and the bottle 10
By setting the angle at or near the instantaneous center of the engine 7, vibration isolation can be effectively achieved.

The rubber 9 is used to prevent the engine γ from swinging more than necessary, and must be prevented from causing resonance phenomena as a vibration system with respect to the vibration frequency generated by the engine γ.

The position B of the bin 10 can be determined from the relationship between the center of gravity G of the engine system, the moment of inertia about the center of gravity G, the mass M of the engine system, and the distance A from the center G to the connecting rod 708, which is the source of vibration.

As detailed above, according to the present invention, in a power lawn mower equipped with a vertical engine, transmission of engine vibration to the housing can be prevented as much as possible, and this type of lawn mower has excellent operational feel and low noise. The above can be contemplated with a simple configuration in which the engine is coupled to the housing by an elastic body, and the crankshaft is coupled to a bottle perpendicular to the crankshaft.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a lawn mower, FIG. 2 is a cutaway longitudinal cross-sectional view of the main parts of the engine and nousing, and FIG. 3 is a perspective view of the pin joint. In addition, in the drawing, 1 is a lawn mower, 2 is...Using, 7 is an engine, 706 crankshaft, 8 is a cutter blade,
9 is an elastic body, and 10il-3 is a support shaft. Patent Applicant: Honda Motor Co., Ltd.] Sato, Patent Attorney, Part 2 1) Patent Attorney: Kuni Ohashi, Patent Attorney: Yu-3 Koyama Figure 2-40- Figure 3

Claims (1)

[Scope of Claims] a. A cutter blade that is housed in a crank and rotates in a horizontal plane is rotationally driven by a substantially vertical rank shaft of a vertical engine disposed on a housing; b. A cutter blade that rotates in a horizontal plane and is housed in a crank; The C3 housing and the engine are connected to each other via an elastic body, and the housing and the engine are connected to each other by a support shaft that is substantially perpendicular to the rank shaft and is provided in a direction perpendicular to the rank shaft. A powered lawn mower consisting of