JPH0595717A - Lawn mower - Google Patents

Abstract

PURPOSE:To provide a lawn mower designed to alter its control mode according to working situations to improve its operability by providing specific flexible devices on the way of the operational linking for a pair of left and right steering operational components equipped each at walking control and riding control sections. CONSTITUTION:A walking control section and riding control section are equipped with a pair of left and right steering operational components 34 and a pair of left and right steering operational components 23, respectively, and the driving speeds of left and right rear wheels are changed independently of each other. Flexible devices 40, 40 are provided on the way of the operational linking for the steering operational components, and the actuation of the steering operational components 23 is stopped during the actuation of the steering operational components 34, and vice versa.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lawnmowers.

[0002]

2. Description of the Related Art Conventional lawn mowers have a riding-type exclusive structure (for example, see Japanese Utility Model Laid-Open Publication No. 3-48425) that rides on a dedicated boarding operation unit provided in a traveling machine for work traveling. There has been a walking type dedicated structure in which a walking control section is provided in the rear part and an operator operates while walking (see, for example, Japanese Utility Model Laid-Open No. 3-58923).

[0003]

However, the above-mentioned passenger type exclusive construction is convenient because it can be easily operated while maneuvering with the same feeling as a passenger car, but the lawn mowing work site is not limited to a flat place. However, when working on a sloping ground or a place with a lot of unevenness, the machine body may become stable, and the size of the machine body as a whole may be increased, resulting in high cost. With the above-mentioned walk-only type structure, the aircraft can be made relatively small and inexpensive, but even when working on a large flat grass, the operator should always operate at the rear of the aircraft. Since it is necessary to walk while grasping and operating the handle, there is a drawback that the work load becomes heavy. An object of the present invention is to provide a lawnmower that can be reasonably safely and comfortably mowed according to the working situation while having a relatively simple structure and a low cost due to a reasonable improvement. ..

[0004]

A feature of the present invention is that a walking control section is provided at the rear of the machine body and a boarding control section is provided at the front of the machine body, and a transmission system is configured to drive the left and right rear wheels separately. Then, a pair of left and right steering operation tools for changing the driving speed of each rear wheel are respectively arranged in the walking control section and the boarding control section, and the walking control section side is provided in the middle of the operation linkage of the steering operation tools. When operating the steering operation tool, the operation of the steering operation tool on the boarding control section side is stopped, and when operating the steering operation tool on the boarding control section side, The point is that there is flexibility to stop the operation.

[0005]

[Operation] When working on a flat lawn, the worker can comfortably work while boarding the boarding control unit, and when working on a sloping ground or a place with many irregularities, in the walking control unit,
By operating while walking behind the machine, you can work in a highly safe state. Also, when maneuvering while walking, it is necessary to steer while manipulating the steering wheel. At that time,
It is preferable to operate the steering handle with left and right hands on sloping ground, and as a result, the steering operation tool will be operated with fingers, but the operation of the steering operation tool on the side of the boarding control section will stop due to accommodation. Therefore, even if you use a finger,
It can be operated easily. Also, a fixed arm is provided in the boarding control section,
When the steering operation tool is attached to the fixed arm, the operation can be performed easily even in the operation of the boarding control unit, and the steering operation tool may be accidentally touched when getting on or off the aircraft. It will be few.

[0006]

As a result, the maneuvering mode can be changed in accordance with the work situation to provide a safe and easy work. In addition, even if the operation system is configured so that the steering operation can be performed in each of the both control sections, the operation can be performed easily, and the work load can be reduced.

[0007]

Embodiments will be described below with reference to the drawings. 1 and 2 show a lawnmower. In this lawnmower, a pair of left and right machine frames 1, 1 are arranged in front of and behind the machine body, and an engine mounting frame 2 is erected over each of the machine frames 1, 1 at the rear portion of the machine body. The engine 3 is mounted and supported on the top. The left and right rear wheels 4 and 4 are arranged on the lower side of the engine 3, and the left and right front wheels 5 and 5 are arranged at the front end of the body frame 1.
A mower 6 is attached between the front wheel 5 and the rear wheel 4 on the lower abdomen of the body. Further, a pair of hydrostatic type continuously variable transmissions H, H are arranged in parallel on the lower side of the engine 3, and each continuously variable transmission H,
The left and right rear wheels 4 and 4 are configured to be driven separately by H,
The left and right front wheels 5 and 5 are idler wheels that are freely rotatable around the vertical axis, and are caster type.

Engines 3 from the left and right body frames 1, 1
A driver's seat 8 is mounted and supported on a front view gate-shaped support frame 7 standing upright while passing above the driver's seat, and the driver's seat 8 is arranged in a space above the engine 3. A driver section step 9 is provided above the mower 6 on the front side of the driver's seat 8. The operation section step 9 is provided over the entire width between the left and right body frames 1, 1 so as to cover the upper side of the mower 6, and a step rubber plate 10 for slip prevention is placed on the upper surface. Fixed arms 12 and 12 are erected from the body frame on both left and right sides of the driver's seat so that the posture of the driver can be stabilized during traveling and can be used as a handle when getting on and off the aircraft. There is. In this way, the boarding control unit A is configured.

The operating section step 9 is constructed so as to be swingable and openable around the rear lateral axis X over the working position for covering the upper part of the mower 6 and the position for opening the upper part of the mower 6. The maintenance work of the drive transmission system is easily performed. That is, as shown in FIG.
The rear end of the operating section step 9 is pivotally connected to the body frame 1 about the horizontal axis X so as to be swingable, and in the closed posture, is urged by the toggle spring 11 toward the closing side and opened. In the posture, it is biased open so that maintenance work can be performed safely.

In addition, this lawnmower is provided with a walking control section B which enables walking control at the rear part of the body. The pair of left and right handle rods 18 extend rearward and upward from both left and right sides of a support member 17 of a fuel tank 16 which is erected on the rear side of the engine mounting frame 2 to form the walking control section B.
That is, when performing lawnmower work on a flat lawn, the operator can sit on the driver's seat 8 and work comfortably, and can walk down and steer from the machine when riding over a slope or a step. It is possible to work comfortably according to the working situation.

While the power is transmitted from the vertical output shaft 3a of the engine 3 to the mower 6 through the transmission belt 19, the other transmission belt 20 is applied to the respective input shafts 21 and 21 of the continuously variable transmissions H and H. The transmission system is configured to transmit power. Then, the continuously variable transmissions H, H are configured such that the transmissions H, H are shifted from the neutral state by the same amount to the forward side by depressing the operation pedal 22 provided in the driving section step 9. At the same time, the forward speed set by the operation pedal 22 by operating the boarding operation levers 23, 23 (an example of a steering operation tool) mounted on the fixed arms 12, 12 at the left and right sides of the driver's seat 8 so as to be grippably operated. The gear shift operation system is configured so that the respective gear shift operations can be performed in the reverse direction. More specifically, as shown in FIGS. 3 and 6, the shift operation shafts 24 and 2 of the continuously variable transmissions H and H, respectively.
The gear shift operation arms 25, 25 attached to the vehicle 4 and the respective boarding operation levers 23, 23 are interlockingly connected via a link mechanism 26. Further, the operation arms 27 and 27 that are relatively rotatable about the same axis as the rotation axis of the speed change operation arms 25 and 25 are pivotally supported, and the operation arms 27 and 27 and the speed change operation arms 25 and 25, respectively.
25 are interlockingly linked with each other via a tension spring 28, and the gear shift operation arms 25, 2 are operated in accordance with the operation of the operation arms 27, 27.
5 is configured to be actuated following. The operation arms 27, 27 are interlockingly connected via a linking rod 29 so as to be integrally operable, and are also interlockingly connected to the operation pedal 22 via a link mechanism 30. Each operation arm 2
Reference numerals 7 and 27 regulate the swing range so that the shift operating arms 25 and 25 swing in an operating region where the shift operation is performed from the neutral position to the forward side, and the operation pedal 22 is always returned to the neutral position side by a spring. It is configured to urge. By swinging the swing operation levers 23, 23 backward, the shift operation arms 25, 25 are moved toward the forward deceleration side, and further backward, against the spring force of the follow-up operation tension spring 28. The operation range is set so that it can be operated to the side.

Therefore, the maximum speed for straight traveling to the forward side is set by the operation pedal 22, and the left and right boarding operation levers 2 are set.
The speeds of the left and right rear wheels 4, 4 can be individually decelerated and reversed by the wheels 3, 23, thereby enabling a turning operation, and a small turn running with the middle position of the left and right rear wheels 4, 4 as the turning center. It is also configured so that the uncut residue at the time of turning can be reduced.

Each of the operation arms 27, 27 is constructed so as to be operable also by a speed setting lever 31 provided in the walking control section B. That is, the one operation arm 27 and the speed setting lever 31 are linked and linked via the link mechanism 32,
A disc spring type friction holding mechanism 33 is interposed in the middle of the link mechanism so that the position can be held at an arbitrary operation position. The speed change actuating arms 25, 25 are also configured to be operable by the left and right grip operation levers 34, 34 (one example of the steering operation tool) provided in the walking control section B. That is, each gear shift operation arm 25, 25 and each grip operation lever 3
4 and 34 are interlockingly linked via a link mechanism 35. When operating the grip operation lever 34 of the walking control unit B, the swing operation lever 23 in the riding operation unit A is operated.
It is designed to be flexible so that it does not swing in conjunction with each other so that it can be easily gripped. More specifically, as shown in FIG. 4, the linkage link 36 on the swing operation lever 23 side,
The swinging member 39, which links the linkage link 37 on the grip operation lever 34 side and the linkage link 38 on the speed change actuating arm 25 side, to the linkage link 36 on the swing operation lever 23 side and the linkage link 37 on the grip operation lever 34 side. Long holes 40, 40 are formed along the swinging direction in the connecting portion of the grip operating lever 34.
When it is operated to the reverse side by operating the lever together with the handle rod 18, the linkage link 36 on the swing operation lever 23 side is operated.
The operation is blocked by the long hole interchange.

The transmission belt 19 for the mower 6 is constructed as a belt tension clutch, and the tension arm 13 is operated by operating either the clutch lever 14 provided in the walking control section B or the clutch lever 15 provided in the boarding control section A. Also, it is configured such that it can be turned on and off, and when one clutch lever is operated, the other clutch lever does not move. That is, as shown in FIG. 7, the tension arm 13 is urged to swing toward the clutch disengagement side by the spring 41, and the position of the tension arm 13 is regulated at the predetermined clutch disengagement position by the stopper 42 to push the link rod 43 on the boarding control section side. Then, the clutch is engaged, and when the pulling operation is performed on the link rod 44 on the side of the walking control unit, the link rods 43 and 44 are linked to the tension arm 13 so that the clutch is engaged, and the link rods 43 and 4 are linked.
When 4 is operated to the clutch engagement side, the other connecting rods are pin-engaged through the long hole interchange 45 so as not to move.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the lawn mower

[Figure 2] Overall plan view of the lawn mower

FIG. 3 is a perspective view showing an operation system.

FIG. 4 is a diagram showing an operation system of a speed change operation arm.

[Fig. 5] Side view of the driving section

FIG. 6 is a plan view of the driving part.

FIG. 7 is a side view of the clutch operation system.

[Explanation of symbols]

 4,4 Rear wheel 12,12 Fixed arm 23,34 Steering operation tool 40,40 Flexible A Boarding control section B Walking control section

Claims (2)

[Claims] 1. A transmission system for driving a walking control section (B) at the rear of the fuselage and a boarding control section (A) at the front of the fuselage to drive left and right rear wheels (4), (4) separately. And a pair of left and right steering operation tools (23) and (34) that configure the rear wheel (4) and the drive speed of the rear wheels (4), respectively, and are the walking control section (B) and the boarding control section (A). And the steering operation tools (23) and (34) are connected to each other, and when the steering operation tool (34) on the side of the walking control section (B) is operated, the boarding control section (A) is operated. ) Side steering operation tool (23) is stopped, and when the boarding control section (A) side steering operation tool (23) is operated, the walking control section (B) side steering operation tool ( Interchange (40), (4) for stopping the operation of (34)
Lawn mower with 0). 2. A pair of left and right fixed arms (12), (12) are provided on the boarding control section (A), and the fixed arms (1) are provided.
The lawn mower according to claim 1, wherein the steering operation tool (23) is attached to the second and second (12).