JPH0789447A - Riding type lawn mower - Google Patents

Abstract

PURPOSE:To provide a four-wheel drive type lawn mower which can lighten the burden in the turning operation. CONSTITUTION:Rack pinion gears 20 and 21 are driven by a driving gear 11 installed on a steering wheel shaft 6A, and an operating arm 18A interlocked with the rack gear 21 through a link mechanism 15 is driven, and a side brake 18 is operated by a steering wheel 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower having left and right side brakes, a steering operation device for a steering device, and a speed change operation device for a traveling transmission.

[0002]

2. Description of the Related Art In a riding lawn mower of this type, FIG.
As shown in FIG. 2, the left and right pedals 25, 2 for the left and right traveling speed change operation tools 8 and the side brakes 18, 18 are sandwiched by the handle posts that support the steering operation tools 6 at the feet of the driving section.
5 was placed.

[0003]

With such an arrangement of the operating mechanism, in an actual turning operation, the side foot pedal is depressed by the left foot while the gear shifting operation tool is depressed by the right foot. In addition to the operation on the steering operation tool, the operation on the working machine such as the mower has to be performed, and the operation is radiated and the operation load is heavy. In addition, the operation of the pedals for the side brakes requires skill to step on and off, and in the operation of unskilled people, since the lawn is scraped by the traveling device because it is a four-wheel drive type, the side brakes There was a request to improve the operation form. It is an object of the present invention to provide a steering device and a side brake which can reduce the operation load when turning.

[0004]

A characteristic structure according to the present invention is to provide a linking mechanism for separately linking the steering device and the left and right side brakes, and linking with the operation of the steering operation tool. The side brakes on the steering direction side are automatically operated.

[0005]

That is, when the steering operation tool is operated, the steering device starts to operate, and the side brake linked with the steering device automatically operates.

[0006]

As a result, the driver does not need to operate the side brake, and the operation load is reduced accordingly. Moreover, since the side brakes are automatically operated, the side brakes are operated with an appropriate operating force, so that it is possible to avoid turf scraping during turning.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 4 and FIG.
The traveling drive unit 2 is arranged from the middle part to the rear part, the driving part 3 is arranged in the rear part, and a four-wheel drive type lawn mower equipped with a front mower F is formed in front of the machine body.

An engine 4 and a radiator 5 are arranged in front of the engine 4 in the prime mover 3, and the driving unit 1
Includes a steering handle 6 as a steering manipulator, a handle post 7 supporting the steering handle 6, and a gear shift manipulator 8 arranged on the right side of the handle post 7 for a hydrostatic continuously variable transmission. A main brake pedal 9 is arranged on that side. The steering device 10 will be described. As shown in FIG. 1, the sector gear 12 is engaged with the drive gear 11 attached to the handle shaft 6A of the steering handle 6. The knuckle arm 14 of the left rear wheel 13 as a steering wheel is linked to the sector gear 12 via a link linking mechanism 15 to transmit the operation of the steering wheel 6 to the rear wheel 13, and the left and right rear wheels 13, The knuckle arms 14 of 13 are connected by a tie rod 16 to form the steering device 10. Left and right front wheels 17,1
7 is a non-steering type, and each has a side brake 18. The side brake 18 is provided with a linkage mechanism 19 with the steering device 10, as described below. That is, the drive pinion gear 20 is engaged with the drive gear 11 attached to the handle shaft 6A, and the rack gear 21 that slides the drive pinion gear 20 left and right is engaged. And this rack gear 2
A bell crank 22 for relay is engaged with both ends of 1, and the bell crank 22 is linked to an operation arm 18A of the side brake 18 via an interlocking rod 23.
The mechanism from the drive pinion gear 20 to the interlocking rod 23 is referred to as a linkage mechanism 19 between the side brake 18 and the steering device 10. The operation of the side brake 18 by the operation of the steering operation tool 6 is determined by the long diameter dimension of the long hole 23A formed in the linking portion of the interlocking rod 23 linked with the bell crank 22. . A spring 24 connecting the interlocking rod 23 and the operation arm 18A is for absorbing a stroke that allows the steering handle 6 to rotate after the side brake 18 is actuated.

[Other Embodiments] The linkage mechanism 19 that links the steering device 10 and the operation arm 18A of the side brake 18 may be as follows. As shown in FIG. 3, the rack gear 21 and the operation arm 18A of the side brake 18 may be linked by a wire. This wire is referred to as a linkage mechanism 19. The linkage mechanism 19 may be configured such that the side brake 18 is driven by an actuator, and a detection sensor that detects an operation movement of the steering operation tool 6 or the steering device 10. The front wheel may be formed in a steering type, and the knuckle arm provided in the front wheel and the linkage mechanism 19 may be linked to each other so that the front wheel can be changed to a four-wheel steering type.

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

[Brief description of drawings]

FIG. 1 is a plan view showing a linkage mechanism between a steering operation structure and a side brake.

FIG. 2 is a plan view showing a state where the steering device is operated from the state of FIG.

FIG. 3 is a plan view showing another embodiment of a linkage mechanism between a steering device and a side brake.

FIG. 4 is a plan view showing a driving unit.

FIG. 5 is a side view showing a riding type lawnmower.

[Explanation of symbols]

 6 Steering operation tool 8 Speed change operation tool 10 Steering device 18 Side brake 19 Linkage mechanism

Claims (1)

[Claims] 1. Left and right side brakes (18), (1
8), a steering operation tool (6) for the steering device (10), and a shift operation tool (8) for the traveling transmission device, the riding lawn mower comprising: the steering device (10); The left and right side brakes (18) and (18) are separately provided with a linking mechanism (19) for linking the side brakes (18) and (18), and the side brakes on the steering direction side are linked with the operation of the steering operation tool (6). 18)
A riding lawn mower designed to operate automatically.