JPH0840320A - Crawler type tractor - Google Patents

Abstract

PURPOSE:To modify a four wheeled riding tractor, with a distance between front/rear wheels adjustable, into a crawler type tractor, usable easily in a wet field and the damp ground, with the front/rear wheels left as mounted, and to form the tractor so that it can be restored to the four wheeled riding tractor. CONSTITUTION:In a four wheeled riding tractor 1 with a distance between front/rear wheels adjustable, in a condition equalizing the distance between the front/rear wheels, a crawler 9 in a manner of enveloping the periphery of the front/rear wheels is mounted, to provide a driving hole meshed with a driving protrusion (lug) of the rear wheel over a peripheral length of the crawler, further to provide an adjusting device capable of moving a front axle part of supporting the front wheel in a machine body front/rear direction. Further in this constitution, the crawler is mounted in a condition of moving the front wheel in a rearward direction by the adjusting device, so as to place the crawler in a tense condition by moving the front wheel in a front direction by the adjusting device in a condition that the rear wheel lug is meshed with the driving hole of the crawler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle for construction, transportation, agriculture and forestry, and more particularly to a crawler type tractor in which a four-wheel type riding tractor used in wetlands and wetlands is changed to a crawler type. Regarding

[0002]

2. Description of the Related Art Conventionally, when a four-wheeled riding tractor is used in a wetland or wetland condition, a tire chain type special attachment having special protrusions is attached only to the rear wheels, or
A half crawler type tractor in which a third intermediate wheel is provided at an intermediate portion of the axial distance between the front and rear wheels and a crawler is provided between the intermediate wheel and the rear wheel to steer with the front wheels is already known.

[0003]

In the case where the tire chain type special attachment is mounted only on the rear wheels as already known, the ground pressure is high and the driving force cannot be exerted depending on the condition of the wetland or the wetland. , It was sometimes impossible to proceed.

Further, in the case of a half crawler type tractor in which a third intermediate wheel is provided in the middle portion of the front and rear wheels, not only is it troublesome to install the intermediate wheel, but also the front wheel. When steering in, the contact pressure of the front wheels was high, and depending on the condition of the wetlands and wetlands, there were some that could not be steered.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a four-wheel type passenger tractor (1) capable of adjusting the front and rear wheels, and envelops the outer circumferences of the front and rear wheels with the front and rear wheels having the same wheel distance. A crawler (9) such as the one described above, and the projection (lug) (12) for driving the rear wheel (3) is provided over the circumference of the crawler (9).
A drive hole (13) that meshes with the front wheel (2) is provided, and an adjusting device that can move the front axle portion supporting the front wheel (2) in the machine longitudinal direction is provided, and the front wheel (2) is moved backward by the adjusting device. With the crawler (9) mounted in the moved state, the rear wheel lug (12) and the drive hole (13) of the crawler (9) are engaged with each other, and the front wheel is moved forward by the adjusting device. The crawler (9) is configured to be in a tension state to solve the above problems.

[0006]

[Advantages] Based on the above structure, the front and rear wheels can be adjusted in distance.
When the wheeled riding tractor (1) is used in wetlands or wetlands, the front wheel (2) is moved rearward by the adjusting device with the front and rear wheels having the same wheel distance, and in this state, The front wheel is moved forward by the adjusting device with the crawler (9) enclosing the outer periphery of the crawler (9) fitted and the rear wheel lug (12) and the driving hole (13) of the crawler (9) meshed with each other. Then, the four-wheel type riding tractor (1) is changed to the crawler type tractor (1a) so that the crawler (9) is in a tension state.

The steering operation in the wetland or wetland state is not the steering operation of the front wheels by the operation of the steering wheel (7), but the driving operation of the left and right crawlers (9) by the operation of the left and right brakes.

In order to return the crawler type tractor (1a) to the four-wheel type riding tractor (1), contrary to the above, first, the front wheel (2) is moved backward by the adjusting device to move the crawler (9). The tension state is released, the rear wheel lug (12) and the driving hole (13) of the crawler (9) are released from the meshed state, and the crawler (9) is taken out to the side.

The reference numerals in parentheses are for the purpose of contrasting with the drawings, but do not limit the structure of the present invention.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

A four-wheel type agricultural tractor 1 is shown in FIGS.
As shown in FIG. 2, the vehicle includes a traveling machine body 5 supported by front wheels 2a and 2b and rear wheels 3a and 3b. The power of an engine 6 mounted on the traveling machine body 5 is transmitted to a rear wheel via a transmission device (not shown). 3a, 3b is transmitted and the agricultural tractor 1 is moved forward and backward.

The driver sits in the driver's seat and operates the steering wheel 7 to steer the front wheels 2a, 2b to move the agricultural tractor 1 straight or turn.

The front wheels 2a, 2b and the rear wheels 3a, 3b are mounted on the traveling machine body 5 so that the wheel distance can be adjusted. When the agricultural tractor 1 is used in a wetland or wetland condition, first, the center of the traveling machine body 5 is used. The front wheels 2a, 2b so as to be symmetrical with respect to the line
Also, the wheel distances of the rear wheels 3a and 3b are set and fixed so that the center lines of the front and rear wheels are aligned, and then the front wheels 2a and the rear wheels 3a.
Also, the left and right crawlers 9a and 9b are attached so as to envelop the outer circumferences of the front wheels 2b and the rear wheels 3b.

As shown in FIGS. 3 and 4, the crawlers 9a, 9b have a main body mainly made of flexible rubber, and the inner circumference thereof has an inner width corresponding to the width A of the front wheels 2a, 2b. Providing a projection 10 having the front wheel 2 when the crawlers 9a and 9b are mounted
A and 2b can be held so as not to deviate, and projections 11 that exert a driving force are provided at equal pitches on the left and right sides of the outer peripheral surface.

Although the widthwise central portions of the crawlers 9a and 9b are formed to be flat, a driving hole having a shape that completely meshes with the lug 12 provided on the outer circumference of the rear wheels 3a and 3b over the entire circumference. 13 are drilled at exactly the same pitch as the lugs 12.

After the crawlers 9a and 9b are engaged with the driving holes 13 and 12 and mounted on the outer circumferences of the front wheels 2a, the rear wheels 3a and the front wheels 2b and the rear wheels 3b, as shown in FIG. Loosen the set bolt 16 and the lock nut 17 of the boss portion 15a of the bracket 15 that protrudes to engage the tension roller 18 with the width A of the protrusion 10 and move it upward to move the crawlers 9a and 9b from the inside. In the tensioned state, tighten the set bolt 16 and the lock nut 17 and fix the tension roller 18 to complete the mounting.
The ring-shaped agricultural tractor 1 becomes a crawler-type tractor 1a.

The crawlers 9a and 9b are connected to the front wheel 2a and the rear wheel 3a.
And the front wheel 2a when mounted on the front wheel 2b and the rear wheel 3b,
Since the steering wheel 2b cannot be steered, the steering of the agricultural tractor 1 depends exclusively on the driving and non-driving of the crawlers 9a and 9b by the brake operation that can independently brake the rear wheels 3a and 3b.

At this time, in order to prevent erroneous operation, as shown in FIG. 6, the outer cylinder 20 and the handle shaft 21 are passed through the base of the handle 7 and fixed by the pin 22 to make the handle 7 inoperable.

The crawler type tractor 1a is replaced with the agricultural tractor 1
To return to the above, contrary to the above, first, the pin 22 is removed to make the handle 7 operable, and then the set bolt 16 and the lock nut 17 are loosened to lower the tension roller 18 downward, and the crawlers 9a and 9b. Release the tension, crawler 9
a and 9b are front wheel 2a, rear wheel 3a and front wheel 2b, rear wheel 3b
To the side.

As another method of tensioning the crawlers 9a and 9b while the above-mentioned crawlers 9a and 9b are mounted on the front wheels 2a, the rear wheels 3a and the front wheels 2b and the rear wheels 3b, as shown in FIGS. 5 front wheels 2a provided at the lower front,
The 2b support fitting 25 is attached to the traveling machine body 5 so as to be movable back and forth, and the four fixing bolts 26 are loosened to remove the front wheels 2a, 2
In the state in which b is moved backward to reduce the wheelbase, the crawler 9
a and 9b are front wheel 2a, rear wheel 3a and front wheel 2b, rear wheel 3b
After mounting, push the push bolt 27 at the rear of the support fitting 25 to move the front wheels 2a, 2b forward to widen the wheelbase,
There is also a method in which the crawlers 9a and 9b are tensioned and the four fixing bolts 26 are tightened to complete the mounting.

The upper hood 30 above the engine 6 of the agricultural tractor 1 has a frame 31 when it is opened rearward.
When pivoting around a fulcrum 32 at the front end and opening the front, the frame 31 is pivoted around a fulcrum 34 supported by a panel 33 together with the frame 31, and can be opened in any of front and rear directions. It is possible to check and maintain.

In front of the radiator 35 in front of the engine 6, there is provided a radiator grill 36 having holes smaller than the fin pitch of the radiator 35.
Immediately in front of 6, a screen 37 having a front area smaller than that of the radiator grill 36 and having a finer hole than the radiator grill 36 is provided to prevent double suction of dust.

[0023]

According to the present invention, in a four-wheel type passenger tractor in which the front and rear wheels can be adjusted in distance, a crawler for enclosing the outer circumferences of the front and rear wheels is mounted with the front and rear wheels having the same wheel distance. A driving hole that meshes with a projection (lug) for driving the rear wheel over the circumference of the crawler, and a adjusting device that can move the front axle portion supporting the front wheel in the machine longitudinal direction , The front wheel is moved rearward by the adjusting device, the crawler is mounted, and the front wheel is moved forward by the adjusting device while the rear wheel lug and the driving hole of the crawler are engaged with each other. The four-wheeled riding tractor can be made into a crawler-type tractor that can easily travel in wetlands and wetlands with few additional parts. Can be restored to a riding tractor It came to be.

[Brief description of drawings]

FIG. 1 is a side view of a claw-type tractor.

FIG. 2 is a perspective view of a four-wheeled riding tractor.

FIG. 3 is a cross-sectional view of a crawler.

FIG. 4 is a plan view of the crawler.

FIG. 5 is a front view of a tension roller.

FIG. 6 is a sectional view of a handle base portion.

FIG. 7 is a side view of a front wheel support portion.

FIG. 8 is a plan view of a front wheel support portion.

FIG. 9 is a side view of a rear opening upper bonnet.

FIG. 10 is a side view of the front opening upper hood.

FIG. 11 is a side view of a radiator grill.

[Explanation of symbols]

 1 Agricultural tractor 2a, 2b Front wheel 3a, 3b Rear wheel 5 Traveling vehicle 7 Handle 9a, 9b Crawler 12 Lug 13 Driving hole 18 Tension roller

Claims (2)

[Claims] 1. A four-wheeled passenger tractor capable of adjusting front and rear wheels, wherein crawlers for enclosing the outer circumferences of the front and rear wheels are mounted with the front and rear wheels having the same wheel distance. Protrusions (lugs) for driving the rear wheels over the circumference
A crawler-type tractor characterized by having a drive hole that meshes with it. 2. A front wheel supporting the front wheel is provided with an adjusting device capable of moving in the front-rear direction of the machine body, and the front wheel is moved rearward by the adjusting device, and a crawler is attached to the rear wheel lug and the crawler. 2. The crawler type tractor according to claim 1, wherein the adjusting device moves the front wheel forward to bring the crawler into a tensioned state in a state where the driving hole of the crawler is engaged.