JPH0538218A - Walking type lawn mower - Google Patents

Abstract

PURPOSE:To carry out change of direction of a machine body and turning of the machine body only by turning operation of an operating handle by interlocking and coupling the operating handle and front wheels by an engaging mechanism and subjecting the front wheels to steering operation by turning operation of steering handle. CONSTITUTION:A mower 4 is located between front wheels 2 and rear wheels 3 and a steering handle 8 of the rear of a machine frame 1 and front wheels are interlocked and coupled by a pinion gear 9, rack 10 and engaging rod 14. The direction of the machine body can be changed or turned only by laterally subjecting an operation handle to turning operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for operating a body of a walk-behind lawnmower.

[0002]

2. Description of the Related Art An example of a steering structure for operating the body of a walk-behind lawnmower right and left is disclosed in Japanese Utility Model Laid-Open No. 3-19157. In this structure, the rear wheels are driving wheels, and the power of the engine is transmitted to the left and right rear wheels via the left and right side clutches. And the front wheels are the caster wheels. With this structure, for example, when turning to the right, the right side clutch is disengaged to stop the driving of the right rear wheel, and the operator holds the fixed steering handle (8 in FIG. 4 of the above publication). ) With the right rear wheel as a fulcrum, the front part of the aircraft swings to the right and turns.

[0003]

As described above, a walking lawn mower equipped with side clutches for the left and right rear wheels is
Many of them are relatively large even if they are walking type. Therefore, a turning operation of swinging the front part of the machine body to the left and right by holding the steering handle at the rear part of the machine body is a force-intensive operation, and may be a heavy labor for a woman or an old person. Further, since heavy objects such as an engine and a grass container are gathered near the rear wheels so that the rear wheels can be easily turned, the center of gravity of the entire body is closer to the rear side. As a result, the front portion of the machine body is likely to bounce up and down when traveling on a work site with severe unevenness. INDUSTRIAL APPLICABILITY The present invention makes it possible to easily turn in a walk-behind lawnmower, and
The purpose is to make the weight balance of the entire body good.

[0004]

A feature of the present invention is that the walking lawn mower is configured as follows. In other words, the front part of the machine frame has steering front wheels for traveling, the rear part of the machine frame has rear running wheels, the part of the machine frame between the front and rear wheels has a mower, and the rear part of the machine frame has The steering wheel is freely rotatable, and the steering wheel and the front wheel are interlockingly connected by a linkage mechanism so that the front wheel can be steered by rotating the steering wheel.

[0005]

With the construction described above, for example, as shown in FIGS. 1 and 2, when an operator standing on the rear side of the machine rotates the steering handle 8 left and right, the front wheels 2 move left and right in conjunction with this. Steering operation is performed. Therefore, since the machine body changes its direction along the direction of the front wheels 2, it is not necessary for the operator to swing the front part of the machine body to the left or right by the steering handle 8 to change the direction. In the configuration of the present invention, it is the front wheels that change the direction of the machine body, and it is not necessary for the operator to swing the front part of the machine body left and right with the rear wheel as a fulcrum to change the direction. There is no need to collect and place them near the rear wheels. Therefore, the engine can be arranged at a position close to the center of the machine body, and other devices can be arranged at the position of the rear wheel without being restricted.

[0006]

As described above, even if the front portion of the machine body is not swung to the left or right, it is possible to easily change the direction of the machine body and turn by simply rotating the steering handle left and right. The maneuverability of the walk-behind lawn mower is improved. In addition, the engine and other devices can be freely placed without being restricted by the position of the rear wheels, and the overall balance of the machine can be improved, so the running stability of the walk-behind lawnmower can be improved. I was able to.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a walk-behind lawnmower of the present invention. Airframe frame 1 assembled by welding square pipes
A pair of left and right front wheels 2 for traveling, which can be steered left and right, are supported by the front portion of the vehicle, and a pair of left and right rear wheels 3 for traveling are supported by the rear portion of the machine body frame 1.

Between the front wheel 2 and the rear wheel 3, a mower 4 having an outlet 4a for cutting grass on the right side is suspended and supported by the body frame 1, and an engine 5 is mounted on the upper rear side of the mower 4. There is. The power from the engine 5 is transmitted to the left and right rear wheels 3 via a 1-pump 2-motor hydrostatic stepless transmission 6 and to the mower 4 via a transmission system different from this. Is configured.

Next, the steering operation structure of the front wheels 2 will be described. As shown in FIGS. 1 and 2, a handle shaft 7 is rotatably supported around a vertical axis P1 of a rear portion of the machine body frame 1, and a steering handle 8 is fixed to an upper end of the handle shaft 7. .. A fan-shaped pinion gear 9 (corresponding to a linkage mechanism) is fixed to the lower portion of the handle shaft 7, and a rack 10 (corresponding to a linkage mechanism) that meshes with the pinion gear 9 is movably supported in the machine longitudinal direction. There is.

On the other hand, a knuckle arm 11 having a V-shape in plan view is fixed to the right front wheel 2, and the knuckle arm 12 of the left front wheel 2 and the knuckle arm 11 of the right front wheel 2 are fixed.
A tie rod 13 is erected and connected to and. A link rod 14 (corresponding to a link mechanism) is erected and connected across the knuckle arm 11 of the right front wheel 2 and the rack 10. As a result, when the steering handle 8 is rotated left and right, the rack 10 is pushed and pulled back and forth, and the left and right front wheels 2 are steered left and right.

As described above, since the knuckle arm 11 of the right front wheel 2 is formed in a letter V shape in plan view, when the steering handle 8 is rotated to the right (the discharge port 4a side of the mower 4), Those with a relatively small maximum steering angle (eg 60
Degree). On the other hand, when the steering handle 8 is rotated to the left (on the side opposite to the outlet 4a of the mower 4), the maximum steering angle is relatively large (for example, 120
Is set).

Since the length of the tie rod 13 shown in FIG. 1 can be adjusted by the turnbuckle 13a, the tie rod 13 is erected on the left and right knuckle arms 11 and 12 while adjusting the length of the tie rod 13 as shown in FIG. It is also possible to connect. As shown in FIG. 3, when the steering handle 8 is turned to the left, the left and right front wheels 2 are steered in a C-shape in plan view. As a result, turning can be performed with the center of the left and right rear wheels 3 as a fulcrum.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall plan view of a walk-behind lawnmower

[Figure 2] Overall side view of a walk-behind lawnmower

FIG. 3 is an overall plan view of a walk-behind lawnmower showing a case where the connection state of tie rods is changed from the state shown in FIG.

[Explanation of symbols]

 1 Airframe Frame 2 Front Wheel 3 Rear Wheel 4 Mower 8 Steering Handle 9, 10, 14 Linkage Mechanism

Claims (1)

[Claims] 1. A front wheel (2) for steerable operation at a front portion of a body frame (1), a rear wheel (3) for traveling at a rear portion of the body frame (1), and the body frame (1). ) In the part between the front wheel (2) and the rear wheel (3)
And a steering handle (8) that can be pivotally operated at the rear of the machine body frame (1), and the steering handle (8) and the front wheel (1) are linked to each other by the linkage mechanisms (9), (10),
(14) are interlockingly connected to each other, and the steering wheel (8) is connected.
A walking lawn mower in which the front wheel (2) can be steered by rotating the.