JP2003246283A - Rubber crawler for crawler vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler for a crawler vehicle which has a long wear-out life and gives excellent riding comfortableness. <P>SOLUTION: A rubber belt (2) has a plurality of core metals (3) embedded in parallel in the width direction at specified pitches L. A hole (5) which accepts teeth of a drive sprocket (not shown in Fig.) is provided between the adjacent core metals (3, 3) at the widthwise central part of the rubber belt (2). A plurality of lugs (7) are formed in a staggered state striding the adjacent core metals (3, 3) on the outer periphery of a rubber belt (2) on the grounding side. The longitudinal direction size C of the lug (7) tread surface (8) on the widthwise outside of the rubber crawler (1) is set larger than the longitudinal direction size B on the center side, so as to make the lug (7) grounding area (hatched M part) of a lower roller (10) pass-through section larger. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber crawler track used for tracked vehicles including construction machines such as bulldozers and hydraulic excavators.

[0002]

2. Description of the Related Art Conventionally, in tracked vehicles including construction machines such as bulldozers and hydraulic excavators, upper and lower rolling wheels are attached to a track frame provided between a starting wheel and a guide wheel, An iron crawler belt is wound around each of these wheels, and the vehicle is driven by the power transmitted to the starting wheels. In recent years, rubber tracks have been used instead of iron tracks as measures against underbody noise and vibration.

FIG. 5 is a bottom view of a conventional rubber crawler belt 20, and FIG. 6 is a view taken in the direction of arrows D-D in FIG. 5 and 6
In the rubber belt 21, a plurality of cored bars 22 are embedded in parallel in the width direction at a predetermined pitch L. Below the cored bar 22, a plurality of annular wires 23, which are tensile strength members, are embedded in parallel in the longitudinal direction of the rubber belt 21, and between the adjacent cored bars 22, 22 in the widthwise central part of the rubber belt 21. Hole 2 for the teeth of the starting wheel (not shown)
4 are provided. The core metal 22 is provided with a guide portion 25 protruding upward and guiding the lower wheel 30. A plurality of lugs 26 are provided on the outer periphery of the rubber belt 21 and on the side of the contact surface.
Is provided. In FIG. 5, the lug 26 is a core bar 22.
The front-rear dimension E of the tread 27 on the center side in the width direction of the rubber crawler belt 20 is set larger than the outer front-rear dimension F.

[0004]

However, the above configuration has the following problems. The portion where the lower roller 30 passes over the rubber crawler belt 20 is the position indicated by the chain double-dashed line,
On the tread surface 27 of the lug 26 is the hatched portion N shown in FIG. The dimension in the front-rear direction of the N portion is smaller than the dimension E on the center side in the width direction. Therefore, the pressure receiving area becomes smaller,
The average ground pressure increases and wear life decreases. FIG. 7 is a graph showing the surface pressure generated in the lug portion 26 when the lower roller 30 passes over the rubber crawler belt 20. As shown in FIG. 7, among the end portions of the lug 26 in the front-rear direction, the peak pressure P2 is generated at the end portion H where the lower wheel 30 passes first. Therefore, the wear of this portion is particularly fast, and the wear life is shortened. FIG. 8 is a conceptual diagram showing a state in which the lower roller 30 passes over the rubber crawler belt 20. As shown in FIG. 8, since the lug 26 is arranged below the cored bar 22 in this example, when the lower rolling wheel 30 is located between the adjacent cored bars 22, 22, when the load of the arrow W is applied downward. The lugs 26, 26 are deformed in the directions of the arrows K, K, and the sinking amount of the lower wheel 30 is increased. As a result, the vertical movement of the lower wheels 30 during traveling becomes great, which makes the riding comfort poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rubber crawler for a tracked vehicle that has a long lug wear life and is comfortable to ride.

[0006]

In order to achieve the above object, a first aspect of the present invention is a rubber crawler track of a tracked vehicle, wherein a plurality of core bars are arranged in parallel in a width direction on an endless belt-shaped rubber belt. In, having a plurality of lugs embedded at a predetermined interval and provided at a predetermined interval on the outer circumference ground side of the rubber belt,
The shape of the tread surface of the lug is formed so as to expand outward from the center side in the width direction of the rubber crawler belt.

According to the first aspect of the present invention, since the tread shape of the lug is formed so as to spread outward from the center side in the width direction of the crawler belt, in the case of the lower end wheel whose tread surface passes the outer side in the width direction of the crawler belt. The contact area of the lug is increased, the average surface pressure is decreased, and the wear life can be extended.

According to a second aspect of the present invention, in the first aspect, the lug is provided so as to extend over two adjacent cored bars.

According to the second aspect of the invention, since the lugs are provided so as to extend over the two adjacent cored bars, the lugs are grounded when the lower rolling wheel passes between the cored bars. Therefore, the sinking amount of the lower rolling wheels is small, the difference from the sinking amount when passing over the core metal is small, the vertical movement of the lower rolling wheels is small, and the riding comfort is improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a rubber track of a tracked vehicle according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a bottom view of an example rubber crawler belt 1,
FIG. 2 is a view on arrow AA of FIG. In FIGS. 1 and 2, a plurality of metal cores 3 are embedded in a rubber belt 2 in parallel in a width direction at a predetermined pitch L. Below the core metal 3, a plurality of annular wires 4 which are tensile strength members,
The rubber belt 2 is embedded in parallel in the width direction of the rubber belt 2.
A hole 5 into which a tooth of a starting wheel (not shown) is inserted is provided between the adjacent cored bars 3 and 3 in the central portion in the width direction of the. The core metal 3 is provided with a guide portion 6 which projects upward and guides the lower rolling wheel 10. On the outer periphery of the rubber belt 2 and the contact surface side,
A plurality of lugs 7 are provided. In FIG. 1, the lugs 7 are provided in a zigzag shape so as to straddle the adjacent cored bars 3 and 3, and the front-rear dimension C of the widthwise outer side of the rubber belt 2 is set larger than the center-side front-rear dimension B thereof.

Next, the operation will be described. The portion of the lower crawler belt 10 that passes over the rubber crawler belt 1 is the outer side in the width direction of the rubber crawler belt 1 as shown by the chain double-dashed line portion in FIG. 1 is the hatched portion M on the outer side in the width direction. In the M portion, the dimension of the lug 6 in the front-rear direction is large, and the pressure receiving area is larger than that of the conventional one shown in FIG. Therefore, the average ground pressure is low and the wear life is long.

FIG. 3 is a graph showing the surface pressure generated in the lug 7 when the lower roller 10 passes over the rubber crawler belt 1.
As shown in FIG. 3, among the end portions of the lug 7 in the front-rear direction, the maximum pressure P1 is generated at the end portion G through which the lower rolling wheel 10 first passes, but as described with reference to FIG. Core metal 3,
It is provided across 3 spaces. Therefore, the core metal 3,
Since the rigidity of the portion between 3 is large, the generated surface pressure of the lug 7 is made uniform as compared with the conventional one, the pressure P1 becomes smaller than the conventional pressure P2 described in FIG. 7, and wear is reduced, Long wear life.

FIG. 4 is a conceptual diagram showing a state in which the lower roller 10 passes over the rubber crawler belt 1. As shown in FIG. 4, in this example, the lug 7 was arranged between the adjacent cored bars 3 and 3. Therefore, when the lower rolling wheel 10 is located between the adjacent metal cores 3 and 3, even if a load indicated by the arrow W is applied downward, the rigidity of this portion is high and the sinking amount of the lower rolling wheel 10 is small. There is little difference from the sinking amount when the wheel 10 passes over the core metal 3. Therefore, the vertical motion of the lower wheels 10 during traveling is small, vibration is reduced, and riding comfort is good.

Since the rubber crawler belt of the tracked vehicle of the present invention has the above-mentioned structure, the surface pressure of the lug during traveling is made uniform,
Pitching (body vibration) during spin turns and pivot turns is less likely to occur. Further, the average surface pressure of the lug ground contact portion is low, so that the wear life is extended. Furthermore, when the lower rolling wheel is on the lug, the length of the lug in the front-rear direction is large and straddles the adjacent core metal, so the rocking phenomenon due to the movement of the lower rolling wheel does not occur, and the rubber is comfortable to ride. The track is obtained.

[Brief description of drawings]

FIG. 1 is a bottom view of a rubber crawler belt of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a graph showing the generated surface pressure of the lug portion when the lower roller passes over the rubber crawler belt of the present invention.

FIG. 4 is a conceptual diagram showing a state in which a lower roller passes over the rubber crawler belt of the present invention.

FIG. 5 is a bottom view of a conventional rubber crawler belt.

FIG. 6 is a view on arrow D-D of FIG. 5.

FIG. 7 is a graph showing the generated surface pressure of a lug portion when a lower roller passes over a conventional rubber crawler belt.

FIG. 8 is a conceptual diagram showing a state in which a lower roller passes over a conventional rubber crawler belt.

[Explanation of symbols]

1 ... rubber crawler belt, 2 ... rubber belt, 3 ... core metal, 7 ... lug,
8 ... Tread.

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

Claims (2)

[Claims] 1. In a rubber crawler track of a tracked vehicle, a plurality of cored bars (3) are arranged in parallel in a width direction on an endless belt-shaped rubber belt (2).
It has a plurality of lugs (7) embedded at a predetermined interval and provided at a predetermined interval on the outer circumference ground side of the rubber belt (2), and the shape of the tread (8) of the lug (7) is a rubber track ( A rubber track of a tracked vehicle, which is formed so as to spread outward from the center side in the width direction of 1). 2. The rubber crawler track for a tracked vehicle according to claim 1, wherein the lug (7) has two core bars (3, 3) adjacent to each other.
A rubber track of a tracked vehicle, which is provided so as to straddle 3).