JP2003261075A - Rubber crawler type travel gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler type travel gear suppressing flopping of a rubber crawler by stabilizing a ground contacting state of the rubber crawler with a road surface even when abrupt turning is carried out, suppressing propagation to a vehicular body of vibration due to a fluctuating load acting on the rubber crawler following turning, and improving ride comfort. <P>SOLUTION: In the rubber crawler type travel gear, a drive tumbler 2 and an idler tumbler 3 are attached to both end parts of a truck frame 1, a plurality of lower rollers 4 are attached to a lower part of the truck frame 1, and it travels by rotating the rubber crawler 10A wound between the drive tumbler 2 and the idler tumbler 3 by the drive tumbler 2. The lower rollers 4 are arranged so that a lower roller rolling contact surface 15 of the rubber crawler 10A and the lower rollers 4 are separated a predetermined distance t on plain land. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rubber crawler type traveling device.

[0002]

2. Description of the Related Art In work vehicles such as hydraulic excavators,
It has a crawler type traveling device as shown in FIG. The crawler belt type traveling device has a starter wheel 2 and an idler wheel 3 attached to both ends of a track frame 1, and a plurality of lower rollers 4 attached to a lower portion of the track frame 1 to connect the starter wheel 2 and the idler wheel 3. The crawler belt 10 is wound in between, and the crawler belt 10 is rotationally driven by the power transmitted to the starting wheel 2 so that the vehicle can travel.

A crawler type traveling device is shown in FIG.
As shown in, the track 1 is located below the starting wheel 2 and the idler wheel 3.
0 is not grounded and the lower rolling wheel 4 is grounded via the crawler belt 10, or, as shown in FIG. 5, the starting wheel 2, the idler wheel 3 and the lower rolling wheel 4 are all connected via the crawler belt 10. Some are grounded. Turning of the vehicle is performed by making a difference between the right and left crawler belt rotational speeds.
As shown in FIG. 6A, when one of the crawler belts 10 stops rotating and only the other crawler belt 10 rotates, a pivotal turn is performed. )
As shown in, by rotating the left and right crawler belts 10, 10 in opposite directions, a super-spin turn (spin turn) capable of turning on the spot is performed. It should be noted that the crawler belt 10 is laterally moved (skidslip) during turning.

In recent years, work in urban areas and residential areas is increasing, and there is a demand for road surface protection such as asphalt and noise reduction. Therefore, as the crawler belt 10, a so-called rubber crawler belt 10A integrally formed endlessly (see FIG. 7), a split type rubber crawler belt in which a steel track plate with a rubber liner attached is linked by a link, or a metal core is included. The split-type rubber crawler belt that links the rubber crawler plates with links is used. A lug 14 protruding outward is formed on the outer peripheral surface of the rubber crawler belt 10A, and the top surface thereof serves as a tread surface 14a. By adopting these various rubber crawler tracks, it is possible to protect the road surface and reduce noise, and reduce vibration during traveling to improve riding comfort.

[0005]

However, in the conventional crawler belt traveling device equipped with the above-mentioned rubber crawler belt 10A, the lower rolling wheel 4 is always grounded through the rubber crawler belt 10A, and therefore the following problems occur. There is. That is, when the work vehicle makes a sharp turn such as a turning turn or a super turning turn, FIG.
As shown in FIG.
The vehicle laterally moves while receiving the body weight W distributed to the vehicle. The lateral movement of the rubber crawler belt 10A smoothly and continuously moves on a road surface which is soft like sand and has a small friction coefficient. However, on a road surface such as concrete or asphalt that has a high coefficient of friction, the road surface and the tread 1 of the rubber crawler track 10A are
Phenomenon in which the rubber crawler belt 10A fluctuates due to large turning resistance between the rubber crawler belt 4a and the rubber crawler track 10A (for example,
Stick-slip phenomenon in which the movement of the sliding surface is intermittent)
Occurs, and the deformation and return of the lug 14 of the rubber crawler belt 10A are repeated. The reaction force at this time is transmitted as vertical vibration to the track frame 1 via the lower rolling wheels 4, causing a large swing in the front-rear direction and the left-right direction of the vehicle body (hereinafter referred to as vehicle body vibration), which causes deterioration of riding comfort. To do.

The present invention has been made in view of the above problems, and stabilizes the ground contact state between the rubber crawler belt and the road surface even when a sharp turn is made to suppress the occurrence of fluttering of the rubber crawler belt. An object of the present invention is to provide a rubber crawler type traveling device capable of suppressing the propagation of vibration to the vehicle body due to a fluctuating load acting on the rubber crawler track due to turning and improving the riding comfort.

[0007]

[Means for Solving the Problems, Actions and Effects] In order to achieve the above-mentioned object, a starter wheel and an idler wheel are mounted on both ends of a track frame, and a plurality of lower rolling wheels are mounted on a lower part of the track frame. However, in a rubber crawler type traveling device that travels by rotating a rubber crawler belt wound between a starting wheel and an idler wheel by the starting wheel, the lower rolling surface and the lower rolling wheel of the rubber crawler belt are specified on a flat ground. The lower wheels are arranged so as to be separated from each other.

According to the above construction, since the lower rolling surface and the lower rolling surface of the rubber crawler belt are separated from each other by a predetermined distance, the lower rolling wheel does not press the rubber crawler belt against the ground and the rubber crawler belt and the road surface are not separated from each other. It is possible to stabilize the ground contact state and suppress the flapping of the rubber crawler track. Further, even if the rubber crawler belt flutters due to the fluctuating load during turning, the rubber crawler belt and the lower roller are separated from each other, so that the vibration due to the flutter of the rubber crawler belt propagates to the vehicle body side through the lower roller. There is no such thing. As a result, even if the vehicle turns on a road surface having a large friction coefficient such as concrete or asphalt, it is possible to obtain a rubber crawler type traveling device that is comfortable to ride without causing vehicle vibration.

When the separation distance is small, rattling or bending of each part of the vehicle body due to the shaking of the vehicle body causes the distance between the lower rolling wheel and the ground to come close, and the lower rolling wheel may press the rubber crawler belt against the ground. Yes, it may cause flapping of the rubber crawler when turning. In addition, if the separation distance is large, the lower rolling wheels will separate from the rubber crawler tracks even on soft rough terrain such as earth and sand, and the lower rolling wheels will not press the rubber crawler tracks to the ground, so the vehicle load and work The lower wheels do not share the reaction force of time,
Since it is shared only by the starter wheel and the idler wheel, running performance and work performance may be impaired. Therefore, the distance between the lower rolling surface and the lower rolling surface of the rubber crawler belt on a flat ground is 5
It is desirable to set it to about 20 mm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described in detail below with reference to the drawings. As shown in FIG. 1, in a rubber crawler type traveling device for a hydraulic excavator, a starting frame 2 and an idler wheel 3 are attached to both ends of a track frame 1, and a plurality of lower rolling wheels 4 are attached to a lower part of the track frame 1. is doing. Further, a rubber crawler belt 10A is wound between the starting wheel 2 and the idler wheel 3, and the power transmitted to the starting wheel 2 rotationally drives the rubber crawler belt 10A to allow the vehicle to travel. ing.

As shown in FIG. 2, the rubber crawler belt 10A has a plurality of metal cores 11 embedded in parallel in the width direction of the rubber crawler belt 10A at regular intervals, and a core metal 11 parallel to the longitudinal direction of the rubber crawler belt 10A. Wires embedded close to the lower surface of the
2 and are integrally molded endlessly. A pair of left and right guide portions 13, 13 is formed in the central portion of the cored bar 11 so as to project upward and guide the lower rolling wheel 4. Rubber track 1
A plurality of lugs 14 projecting outward are formed on the outer peripheral surface of 0A, and the top surface of the lugs 14 has a rubber crawler track 10.
It becomes the tread surface 14a of A. Further, on the left and right sides of the guide portions 13, 13 on the inner peripheral surface of the rubber crawler belt 10A, lower rolling contact surfaces 15 that can contact the lower rolling contact 4 are formed.

The lower roller 4 is separated from the lower roller rolling surface 15 of the rubber crawler belt 10A by a distance t so that the track frame 1 can be separated.
It is rotatably supported by a shaft 8 attached to the shaft. At the center of the lower roller 4, the guide portions 13, 13 of the rubber crawler belt 10A are provided.
Are provided with guide grooves 4a, 4a in which the is loosely fitted.

Even when a sharp turn such as a turning turn is made on a road surface having a large friction coefficient such as concrete or asphalt, the lower rolling surface 15 of the rubber crawler track 10A and the lower rolling wheel 4 are separated from each other by a predetermined distance t. Therefore, the lower roller 4 does not press the rubber crawler belt 10A against the ground, the ground contact state between the rubber crawler belt 10A and the road surface can be stabilized, and the occurrence of fluttering of the rubber crawler belt 10A can be suppressed. It is possible to obtain a rubber crawler type traveling device that is comfortable to ride without being generated. Also, when traveling on uneven terrain such as earth and sand, rubber crawler track 10A
Is deformed between the starting wheel 2 and the idler wheel 3, the lower rolling wheel 4 contacts the lower rolling surface 15 and is grounded via the rubber crawler belt 10A. Therefore, the lower rolling wheel 4 shares the vehicle body weight and the reaction force during work with the starting wheel 2 and the idler wheel 3 via the rubber crawler belt 10A.

It is needless to say that the present invention is not limited to the above embodiment, and changes and modifications can be made within the scope of the present invention. For example, the shape of the lower wheel 4 is not limited to the above embodiment, and may be another shape.
In response to this, the position of the lower rolling surface 15 of the rubber crawler belt 10A also changes, and the left and right sides P, P of the guide portions 13, 13 shown in FIG. 3 or the top surfaces Q, Q of the guide portions 13, 13 are changed. It may also be the lower rolling surface. Of course, the guide parts 13, 1
It may be an intermediate R of 3.

Although a hydraulic excavator has been described as an example of a work vehicle equipped with a rubber crawler type traveling device, similar effects can be obtained by applying the present invention to other work vehicles such as so-called crawler carriers. . Furthermore, rubber track 10A
As an example, FIG. 7 is illustrated, but the pattern of the lug 14 is not limited to this. Also, the integrated rubber crawler track 10
As explained in the traveling device equipped with A, a split type rubber crawler belt in which steel track plates mounted with a rubber liner are linked by links, or a split type rubber track in which rubber crawler plates with a core metal are linked by links. The present invention may be applied to a traveling device equipped with a crawler belt.

[Brief description of drawings]

FIG. 1 is a side view of a rubber crawler type traveling device to which the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view according to another aspect of the embodiment.

FIG. 4 is a side view of a conventional crawler type traveling device.

FIG. 5 is a side view of a conventional crawler type traveling device.

FIG. 6 is an explanatory diagram of a turning pattern.

FIG. 7 is a perspective view of a rubber track.

FIG. 8 is an explanatory diagram of a rubber crawler belt when turning.

[Explanation of symbols]

1 ... Track frame, 2 ... Starting wheel, 3 ... Idler wheel, 4 ...
Lower roller, 10A ... Rubber crawler belt, 11 ... Core metal, 13 ... Guide part, 14 ... Lug, 15 ... Lower roller rolling surface, t ... Separation distance.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Shimizu             1-9-9 Minamidai, Kawagoe City, Saitama Prefecture Komatsu Zenoa             Kawagoe Factory Co., Ltd.

Claims (2)

[Claims] 1. Starter wheels at both ends of the track frame (1)
(2) and idler wheels (3) are mounted, multiple lower wheels (4) are attached to the bottom of the track frame (1), and the starter wheels (2) and idler wheels (3)
In a rubber crawler type traveling device in which a rubber crawler track (10A) wound between and is rotated by a starter wheel (2), the rubber crawler track (10A) is placed on a flat surface and the lower rolling contact surface (15) and Wheel (4)
A rubber crawler type traveling device characterized in that lower rolling wheels (4) are arranged so as to be separated from each other by a predetermined distance (t). 2. The rubber crawler type traveling device according to claim 1, wherein the lower limit of the predetermined distance (t) is 5 mm.