JPH06328966A - Traveling device of lawn mower - Google Patents

Abstract

PURPOSE:To improve the traveling performance on a sloping road or the like and facilitate the drive in the condition of inclination to the right and left direction while preventing the damage to the lawn by the rear wheels in the steering operation of the flat place in a lawn mower of front mount type where the right and left front wheels which are not steered are freely driven, and the right and left rear wheels are freely steered. CONSTITUTION:In a lawn mower where the right and left front wheels 3 which are not steered are freely driven and the right and left rear wheels 4 are freely steered, a rear-wheel driving device 9 to drive the right and left rear wheels 4 is provided, and a clutch 9c mounted on this rear-wheel driving device 9 in the gear-off and energized condition is brought into the gear-in operation by stepping on a pedal 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a front mount type lawnmower in which left and right front wheels which are not steered are freely driven and left and right rear wheels are steerably operated.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned front mount type lawnmower, in order to prevent damage to the lawn caused by slipping of the rear wheels during steering, only the front wheels are always driven and the rear steering wheels are idle wheels. Was there.

[0003]

However, when such a lawnmower is used in a highly undulating place such as a golf course,
If only the front wheels are driven, there is a possibility that the driving front wheels may slip when traveling on an uphill road and the vehicle may not be able to travel satisfactorily. The main object of the present invention is to improve the driving performance when traveling uphill while preventing damage to the grass due to the rear wheels when steering on relatively flat grass, and to easily drive even when the aircraft is tilted. The point is to be able to.

[0004]

A characteristic configuration of the present invention is to provide a lawn mower in which left and right front wheels which are not steered are freely driven and left and right rear wheels are steerably operated. The rear wheel drive device for driving the vehicle is provided, and the foot-operated rear wheel drive connection / disconnection means for switching the left and right rear wheels between the driving state and the idling state.

[0005]

In other words, the rear wheel drive device can drive the left and right rear wheels, and the rear wheel drive connection / disconnection means can switch the left and right rear wheels between the driving state and the idling state. On a flat grass, only the front wheels are driven to put the rear steering wheels in an idle state to prevent damage to the grass caused by slipping of the rear wheels during steering. With the four-wheel drive, the slip of the wheels can be sufficiently suppressed and the vehicle can travel satisfactorily. Moreover, since the rear-wheel drive connecting / disconnecting means for switching the rear wheel between the driving state and the idling state is formed in a foot-operated type, the two-wheel drive state and the four-wheel state can be maintained while operating the steering wheel with both hands even in a left-right inclined place. The drive state can be switched.

[0006]

As a result, while preventing damage to the grass due to the rear wheels when steering on relatively flat grass, the running performance on slopes and the like can be improved, and the vehicle can be easily driven even when it is tilted to the left or right. It is now possible to provide a lawnmower that is excellent in running performance and drivability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a boarding and operating section 1 having a steering wheel 1a and a driver's seat 1b, a drive section 2, left and right front wheels 3 which are not steered, and a left and right rear which can be freely rolled and steered with respect to an aircraft A lawn mowing device 5 is connected to a front part of a vehicle body having wheels 4 and the like so as to be vertically movable, thereby forming a riding type lawn mower that can be suitably used in a golf course or the like. 1 and 2
As shown in, the output from the engine 2a is transmitted to the hydrostatic continuously variable transmission 7 via the transmission shaft 6, and the gearshift output shaft 7a of the hydrostatic continuously variable transmission 7 and the miss case M are installed. The front wheel differential device 8 is gear-interlocked with each other, the power branched in the mission case M is transmitted to the rear wheel drive device 9, and the input shaft 7b of the hydrostatic stepless transmission 7 is extended. The constant speed output shaft 7c and the lawnmower 5 are linked by a transmission shaft 10 or the like. In the rear wheel drive device 9, a transmission shaft 9a gear-interlocked with the shift output shaft 7a of the hydrostatic continuously variable transmission device 7 and a rear wheel differential device 9b for driving the left and right rear wheels 4 are installed. Axle case A, transmission shaft 9
A clutch 9 for connecting and disconnecting a and the rear wheel differential device 9b
c is provided, and the clutch 9c is disengaged on a relatively flat grass, so that only the front wheels 3 are driven to put the steering rear wheels 4 in an idle state, and the grass is slipped by the rear wheels 4 during steering. It is constructed so that damage can be prevented, and on a slope or the like, the clutch 9c can be engaged so that the front wheels 3 and the rear wheels 4 can be driven by four-wheel drive reliably. The axle case A has a front and rear horizontal axis P through the front and rear bearings B, B.
It is supported so that it can be rolled around. The clutch 9
The fork 11 for operating c is provided so as to be swingable around the support shaft 12 and urged in the cutting direction by the return spring 13, and as shown in FIG. The pedal 14 is swingably provided around the support shaft 15, and the first pedal 14 is interlocked with the fork 12 via an interlocking member 16 such as a rod or a wire.
When is depressed, the clutch 9c is engaged and operated against the return spring 13. Hook 1 that engages and disengages with a locking piece 18 attached to a mounting member 17 of the first pedal 14.
9 is swingable around a support shaft 20 and a torsion spring 2
The second pedal 22 for clutch disengagement, which is provided in a state of being biased in the engagement direction with respect to the locking piece 18 by 1 and operates the hook 19 in the disengagement direction with respect to the locking piece 18, is attached to the hook 19. The two pedals 14 and 22 are arranged close to each other so that one foot can be stepped on at the same time.
The cam action between 9 causes the hook 19 to be twisted by the torsion spring 2 as the locking piece 18 is rotated by depressing the first pedal 14.
It is configured to swing against 1 and engage with the locking piece 18. That is, when only the first pedal 14 is depressed from the state shown in FIG. 4, the clutch 9c is engaged and operated to bring the front wheels 3 and the rear wheels 4 into the four-wheel drive state. As shown in FIG. Is maintained by the action of the hook 19. Then, when the second pedal 22 is stepped on in the four-wheel drive state, the hook 19 is disengaged from the locking piece 18, the clutch 9c is disengaged by the return spring 13, and only the front wheel 3 is returned to the two-wheel drive state. Further, as shown in FIG. 6, when the first and second pedals 14 and 22 are depressed at the same time, the four-wheel drive state is temporarily established only while the pedals 14 and 22 are depressed. When the foot is released, only the front wheel 3 returns to the two-wheel drive state. In short, the rear wheel 4 can be switched between the driving state and the idling state by a stepping operation, and the steering wheel 1a can be reliably operated with both hands even in a place inclined to the left and right to switch between the two-wheel driving state and the four-wheel driving state. I am allowed to do so.

[Other Embodiments] The specific structure of the rear wheel drive device 9 can be appropriately changed to a mechanical type, a hydraulic type, or the like, and a stepping operation type structure for switching the rear wheel 4 between a driving state and an idling state. Can be appropriately changed in accordance with the specific configuration of the rear wheel drive device 9, and these various configurations can be changed to the rear wheel drive disconnecting means 14,
22 collectively. By providing a biasing means 13 such as a return spring for biasing the operation portion of the rear wheel drive connecting / disconnecting means 14, 22 in order to maintain the rear wheel 4 in an idling state, it is possible to switch between the two-wheel drive state and the four-wheel drive state. Although it is excellent in operability, it can be modified such that the biasing means 13 is used to maintain the rear wheel 4 in a driving state, or the first pedal 14 is depressed forward and backward to omit the second pedal 22. is there.

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 configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the lawn mower

FIG. 2 is a partially cutaway side view of a traveling transmission unit.

FIG. 3 is a perspective view of a clutch operating portion.

FIG. 4 is a side view of a clutch operating portion in a two-wheel drive state.

FIG. 5 is a side view of the clutch operating portion in a four-wheel drive state.

FIG. 6 is a side view of the clutch operating portion in a temporary four-wheel drive state.

[Explanation of symbols]

 3 Front Wheel 4 Rear Wheel 9 Rear Wheel Drive Device 13 Energizing Means 14 and 22 Rear Wheel Drive Intermittent Means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshikazu Togoshi 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Toshihiko Hamada 64, Ishizukitamachi, Sakai City, Osaka Kubota Sakai Manufacturing Co., Ltd. In-house

Claims (2)

[Claims] 1. A lawn mower in which left and right front wheels (3) that are not steered are drivable and left and right rear wheels (4) are steerably operated. Driven rear wheel drive (9)
The traveling device of the lawn mower, which is provided with the rear wheel drive connecting / disconnecting means (14, 22) for switching the left and right rear wheels (4) between the driving state and the idling state. 2. The lawn mower traveling apparatus according to claim 1, further comprising: rear wheel drive connecting / disconnecting means (14, 22) for stably maintaining the left and right rear wheels (4) in an idle state. A traveling device for a lawn mower provided with a biasing means (13) for biasing.