JPH07132718A - Farming work vehicle - Google Patents

Abstract

PURPOSE:To increase the degrees of freedom in a suspension mechanism so that rolling a machine body can be suppressed, in a farming work vehicle whose front/rear wheels are supported to a car body frame through the suspension mechanism. CONSTITUTION:Supporting arms 1A, 1A of a pair of right/left front wheels 1, 1 are mounted on a car body frame 3 capable of rolling, and also a pair of these right/left front wheel supporting arms 1A, 1A are constituted into an independent suspension type through a suspension mechanism S1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work vehicle such as a riding lawn mower.

[0002]

2. Description of the Related Art A conventional agricultural work vehicle is an actual Kaihei 2-2081.
As disclosed in Japanese Patent No. 32, No. 32, the front and rear wheels can be independently suspended from the vehicle body frame via a suspension mechanism.

[0003]

Although the front and rear wheels are supported by the suspension mechanism to absorb vibrations due to the unevenness of the road surface to improve the riding comfort, the unevenness in the left and right directions of the road surface becomes large. On the other hand, the suspension mechanism is unable to follow up completely and rolling of the aircraft occurs, and improvement is desired.

An object of the present invention is to make it possible to suppress rolling of the machine body while improving riding comfort.

[0005]

To achieve the above object, the present invention is characterized in that a pair of left and right front wheel support arms are mounted on a vehicle body frame in a rolling manner and a pair of left and right front wheel support arms are mounted. The point is that it is configured as an independent suspension type via a suspension mechanism.

[0006]

[Operation] Large unevenness in the left-right direction of the road surface can be followed by the rolling action of the support arm for the front wheels without tilting the aircraft left and right, and small unevenness can be followed by the suspension mechanism. It will be possible.

[0007]

As a result of the above structure, the vertical free movement of the front wheels is increased by the rolling action of the front wheels and the cushioning action of the suspension mechanism, and the riding comfort is not deteriorated with respect to large and small irregularities on the road surface. It will be possible to respond.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a midmant type riding lawn mower as an agricultural work vehicle. This riding lawn mower includes a pair of left and right steering front wheels 1 and 1 and a pair of left and right driving rear wheels 2 and 2. The steering wheel 4 is arranged in the front part of the body frame 3 provided, the driver seat 5 is arranged in the middle part, and the engine is arranged in the rear bonnet 6,
The mower 8 is hung from the lower portion of the vehicle body frame 3 between the front and rear wheels 1 and 2 via a four-link mechanism 7 including a front link 7a and a rear link 7b.
It is configured so that it can be moved up and down via.

The pair of left and right rear wheels 2, 2 are supported by the vehicle body frame 3 via a suspension mechanism S ₂ .

That is, one end of a U-shaped suspension frame 10 in plan view is rotatably supported by the vehicle body frame 3, and the other end is supported by a pair of left and right suspension springs 11 so as to be vertically swingable. A rear wheel axle case 2a is fixedly connected to the suspension frame 10.

The pair of left and right front wheels 1 and 1 are mounted on the vehicle body frame 3 so as to be freely rotatable around the front-rear axis, and are configured as left and right independent suspensions via a suspension mechanism S ₁ .

That is, as shown in FIGS. 2 and 3, boss portions 1a, 1a are provided at the ends of the support arms 1A, 1A of the pair of left and right front wheels 1, 1 and the boss portions 1a, 1a are connected to each other. It is rotatably attached to the bracket 3a of the vehicle body frame 3 about the front-rear axis P via the front-rear pivot pin 12, and the support arms 1A, 1A are mutually attached to the lower surface of the arms 1A, 1A. The arms 1A, 1A are restricted from rotating downward relative to each other via stoppers 13, 13 extending from the bosses 1a, 1a as a restricting mechanism that contacts the arms 1A, 1A. On the lower surface of the vehicle, a spring 14 for suspension is installed over both arms 1A, 1A, and the support arms 1A, 1A for the pair of left and right front wheels 1, 1 with respect to the vehicle body frame 3 are attached to the front and rear axis P.
Freely rolling around and supporting arms 1A, 1 for the pair of left and right front wheels 1, 1 against the biasing force of the spring 14.
A is configured as an independent suspension type.

Front ends of front links 7a, 7a for suspending mowers are connected to the rear surfaces of the support arms 1A, 1A for the front wheels, so that even if the vehicle body frame 3 moves up and down due to unevenness of the road surface, The cutting height does not change.

[Other Embodiment] As shown in FIG. 4 and FIG.
In constructing the pair of left and right front wheels in a freely rolling manner and in the left and right independent suspension system, the support arms 1A, 1A of the pair of left and right front wheels are attached to the bracket 3a of the vehicle body frame 3 via the front and rear shafts 12 through the pivot pins 12. A front arm bracket 1B rotatably mounted around a core P is pivotally supported so as to be independently swingable from side to side, and its supporting arms 1A,
1A and the front arm bracket 1B across the arm 1
Rods 13, 13 as a regulating mechanism for regulating the relative downward rotation of A and 1A are installed, and the suspension springs 14, 13 are provided on the rods 13, 13.
14, the pair of left and right support arms 1A, 1A can be freely rolled around the front-rear axis P with respect to the body frame 3, and the pair of left and right support arms 1A can resist the biasing force of the springs 14, 14. , 1A may be independently suspended.

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]

1] Overall side view

FIG. 2 is a partially cutaway front view of a front wheel support structure.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a vertical sectional front view of a front wheel support structure according to another embodiment.

FIG. 5 is a cross-sectional plan view of the same.

[Explanation of symbols]

1 front wheel 1a front wheel support arm 2 rear wheel 3 body frame S ₁ front wheel suspension mechanism S ₂ rear wheel suspension mechanism

Claims (1)

[Claims] 1. A farm work vehicle in which a pair of left and right rear wheels (2), (2) are mounted on a vehicle body frame (3) via a suspension mechanism (S ₂ ), and a pair of left and right front wheels (1). ，
The support arms (1A) and (1A) of (1) are mounted on the vehicle body frame (3) in a rolling manner, and the pair of left and right front wheel support arms (1A) and (1A) are attached to the suspension mechanism (S ₁ ). Agricultural work vehicle that is configured as an independent suspension type through.