JPH0829725B2 - Rubber track - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber track of a tracked vehicle, and more particularly to a rubber track of a construction machine such as a bulldozer or a hydraulic excavator.

(Prior Art) Conventionally, as shown in FIG. 5, in a tracked vehicle such as a bulldozer in which an endless track 21 made of rubber is used instead of an iron track for protection of road surface and noise and vibration, an idle wheel is used. A plurality of upper rolling wheels 25 and lower rolling wheels 26 are provided on a track frame 24 provided between the 23 and the starting wheel 22, and the crawler belt 21 is wound around each of these wheels and transmitted to the starting wheel 22. The vehicle is driven by the generated power. In order to prevent noise and vibration, the crawler track used in this way has recently been replaced by a conventional iron crawler track so that a rubber-integrated crawler track can be replaced and mounted. The rubber crawler belt and the starting wheel mesh with the crawler belt by skipping one tooth with respect to the odd number tooth of the starting wheel. This is because the teeth of the starting wheel are meshed with the next tooth which is shifted by one pitch after one rotation by making the teeth of the starting wheel an odd number, and the wear of the teeth of the starting wheel is reduced as much as possible.

(Problems to be solved by the invention) However, in the case of the above-mentioned conventional rubber crawler belt, the crawler belt pitch becomes large, and an angle is formed between the adjacent crawler belts, and the bending angle becomes large when wound around the starter wheel or the idler wheel. Therefore, the strain rate of the rubber on the lug side becomes large and cracks easily occur, and there is a problem in the durability of the rubber. Since the distance between the adjacent cored bars 27 embedded in the rubber 29 is widened at regular intervals in the direction perpendicular to the moving direction of the rubber crawler belt, the lower rolling wheel travels on the rolling surface 15 of the cored bar. At this time, there is a drawback that the vibration falls around the space between the adjacent cored bars and the vibration around the undercarriage increases to generate noise.

In order to solve these drawbacks, not all the teeth of the starting wheel are skipped, but all the teeth are meshed with the core metal meshing engagement portion, thereby doubling the number of core metal and reducing the bending angle of the rubber track. (Hereinafter referred to as short pitch type rubber crawler).

Since this rubber crawler has more cores than the conventional rubber crawler, the width of the cored bar in the front-back direction of the crawler becomes narrow unless the length of the rubber crawler changes.

Therefore, assuming that the load of the vehicle body received by the crawler belt per core metal is the same, for example, when the vehicle body rides on a stone or the like, the vehicle body load is received by the crawler belt. The strength decreases and it becomes easy to bend. As a result, the rubber crawler belt is deformed in the cross-sectional direction and the rubber is peeled off from the core metal, which shortens the life of the lug.

Further, in the conventional short pitch type rubber crawler belt, the lug is formed on one core bar projection surface and is provided in the direction perpendicular to the moving direction of the rubber crawler belt, and the lug is not continuously grounded.

Therefore, even if an attempt is made to increase the top area of the lug, there is a limit because there is little freedom in selecting the lug shape within the limited area of the cored bar.

Further, the shearing cross-sectional area of the soil in the recessed portion between the lugs is reduced, and the shearing force is reduced. Furthermore, soil is likely to adhere to the rug and the soil is not easily detached, so a good discharging action cannot be expected.

Therefore, if the space between adjacent lugs is expanded to secure the necessary shearing area of soil, the top area of the lugs must be reduced, resulting in increased surface pressure of the lugs and abrasion, which reduces the rigidity of the rugs. Leads to.

When the rigidity of the lug decreases, the lug is likely to bend when the lower wheel moves during traveling, and the vertical vibration of the vehicle easily occurs due to the lower wheel falling.

Further, if the rigidity of the rubber crawler belt is reduced, the rubber crawler belt receives a lateral force during turning, which causes a disengagement between the rubber crawler belt and the starting wheel, resulting in the crawler belt disengagement.

In view of this, the present invention branches the lug shape on the ground contact side into the widthwise central portion of the rubber crawler belt, and from the widthwise central portion to the end surface of the crawler belt so as to be distant from each other in the lateral direction, and the branching is The left and right staggered patterns are arranged so as to straddle three or more adjacent core metal projection planes while being continuous.

In addition, the valley between adjacent lugs is configured to widen toward the end of the crawler belt from the center to prevent separation of the core metal and rubber, ensuring lug life and facilitating soil discharge, It is possible to prevent a decrease in traction force. Further, since the rigidity of the rubber crawler belt can be secured, it is an object of the present invention to provide a short-pitch type rubber crawler track that can suppress vertical vibration of the vehicle to a minimum and prevent the rubber crawler belt from coming off. To do.

(Means for Solving the Problems) In order to achieve the above object, a rubber crawler belt according to the present invention has (1) a metal cored bar having a meshing engagement portion with a starting wheel and a rolling rail surface of a rolling wheel. Are arranged in parallel in the belt-like direction at a pitch that meshes with all the teeth of the starting shaft teeth, and in the rubber crawler track in which a meshing engagement hole with the starting wheel is provided between the adjacent cores in the widthwise central part, on the grounding surface side. The lug to be provided is composed of a central portion in the width direction and branch portions which are sequentially distant from each other in the left-right direction from the central portion in the width direction to the end face, and is a continuous lug over the entire length in the strip-like direction, and the branch portion is three or more. Is formed so as to straddle the core metal projection surface, and the left and right branch portions are arranged in a zigzag pattern with respect to each other.

(2) In the above-mentioned structure, the lug is engaged with the central portion provided between the adjacent engaging engagement holes and the branch portion continuous with the two adjacent central portions sandwiching the engaging engagement hole. It is formed so as to surround three sides of the dowel, and is configured in a zigzag manner over the entire circumference in the band-like direction.

(3) Further, the branch portions of the lugs are arranged so as to be staggered with respect to each other by shifting by one pitch the core metal on the left and right.

(4) Further, the branch portions of the lugs are formed so as to continuously and diagonally cross three or more adjacent core metal projection surfaces.

(5) Further, the branch portions of the lugs are arranged so as to cross diagonally three or more adjacent metal bar projection planes in a continuous diagonal manner, and in a diagonal direction from the central portion to the widthwise end portion at the ground contact surface. It is formed so as to move away from.

(6) Further, the length of the branch portion of the lug in the belt-like direction is gradually shortened as the distance from the central portion of the crawler belt increases toward the left and right end portions.

(7) In addition, the branch portion of the lug has a configuration in which one of the slopes formed between the top surface and the base portion has a gentle slope in one of the front and rear sides in the strip direction and the other has a steep slope.

(8) Further, among the slopes formed between the top surface and the base portion of the branch portion of the lug, the slope having a gentle slope gradually becomes gentle as it goes away from the center of the crawler belt toward the left and right ends. It is formed as follows.

(9) Further, the lug is formed such that the left and right branched portions both traverse the portion between the adjacent metal cores at two or more locations.

(10) And, the recess formed between the lug and the adjacent lug has a triangular shape or a trapezoidal shape in which the end portion is wider than the center portion in the crawler belt width direction and the cross section has a rounded bottom. It is what

(Working) The short pitch rubber crawler belt that meshes with all the teeth of the starter wheel has a lug shape that is continuous over the entire length in the belt-like direction, and the branch portion extends over three or more core metal projection surfaces. Since it is formed on the lug, the contact area of the lug can be made large, and as a result, the contact load is dispersed and the surface pressure at the top of the lug is reduced.

The staggered arrangement of lugs, on the other hand, also increases the area of the recess between adjacent lugs, which results in increased soil shear and vehicle traction.

Further, since the recessed portion between the lugs is provided with a bottom portion continuing from the steep slope to the gentle slope so that the shearing force of the soil in the three-dimensional direction can be obtained, the traction force can be further increased.

Furthermore, since the lug shape is continuous over the entire length in the belt-like direction as described above, the rigidity of the rubber crawler belt is increased, and as a result, the vehicle body vibration is reduced, and the sand trapped in the recess of the lug vibrates. There is no destruction.

Further, since the shape of the concave portion of the lug is such that it expands toward the end of the crawler belt (expands toward the end), the soil can be easily discharged.

(Embodiment) An embodiment of the rubber crawler belt according to the present invention will be described in detail below with reference to FIGS. 1 to 3.

First, a rubber crawler track lug of a tracked vehicle such as a bulldozer will be described with reference to FIGS. 1 (a) and 1 (b). The top portion 9a of the lug 9 on the ground contact side is formed on a continuous surface, and the top portions 9a of the lug 9 intersect each other with the width direction as the center, which is a so-called staggered shape. The branch portions 10, 10a11, 11a of the lug 9 forming the staggered shape are arranged asymmetrically with respect to the center line in the width direction. However, in this embodiment, the branch portions 10, 10a, 11 and 11a have the same shape.

The branch portions 10, 10a, 11, 11a of the lug 9 are formed so as to straddle three or more core bars 3, 3, 3 from the center in the width direction to the end.

The teeth of the starting wheel and the meshing engagement hole 7 are formed in the branch portions 10 and 10 described above.
It is formed so as to surround in a U shape by intersecting at the central portions of a, 11, and 11a.

And the branch portions 10, 10a, 11, 11a of the top 9a of the lug 9
Has a shape in which the width gradually narrows from the center line in the width direction of the lug 9 toward the end.

Further, the recess 12 between the adjacent lugs 9, 9 is wider at the end than at the center, and the cross section of each recess is triangular or trapezoidal, so that the flow of sediment during traveling, that is, the central part is narrow. Even if the earth and sand bite into the meshing engagement hole 7 of the starting wheel at some place, the end portion is widened, so that the soil can be removed easily.

Further, as shown in FIG. 1 (b), the recess 12 between one lug 9 and the lug 9 adjacent thereto has a steep slope 20a and a gentle slope 2a.
It is formed by 0b and the bottom portion 20c.

The steep slope 20a has a steep slope in order to generate a traction force, and the gentle slope 20b has a gentler slope than the steep slope 20a in order to improve soil removal.

Furthermore, as shown in FIG. 1 (a), the lug bifurcation 1
Of the slopes formed between the top and bottom of 0, 10a, 11, 11a, the slope 20b is formed to have a gentle slope from the center of the track toward the left and right ends. .

This makes it easier to remove the earth and sand excavated by the lag.

The lug 9 is formed such that the left and right branch portions 10, 10a, 11 and 11a cross the portion between the adjacent cored bars 3 and 3 at two or more locations.

As a result, the ground load is distributed to the two or more cored bars 3, 3 through the lug 9.

Recesses between the lug 9 and the lugs 9 adjacent to each other
12 is formed by a steep slope 20a, a bottom 20c and a gentle slope 20b from the top 9a of the lug 9 to the top 9a of the adjacent lug 9.
As a result, the area for shearing the soil due to the crawler belt driving force is increased, which helps increase the traction force.

2 is a plan view seen from the inside of the rubber crawler belt 1 according to the present invention, and FIG. 3 is a sectional view taken along the line AA of FIG.

In the rubber crawler belt 1 shown in FIG. 2, a large number of metal cores 3 are embedded in the rubber 2 at right angles to and parallel to the longitudinal direction as described above, and a pair of protrusions is provided at the center of each metal core 3 in the width direction. -Shaped rolling wheel guide surfaces 14, 14 are provided, and rolling rail surfaces 15, 15 are provided on both outer sides of the rolling wheel guides 14, 14 in the longitudinal direction so as to be parallel to the rolling wheel guide surface 14, respectively, This rolling rail surface 1
Lower wheels (not shown) roll on the upper parts of the wheels 5 and 15.

A meshing engagement portion 16 that meshes with the bottom of the teeth of the starting wheel is formed in the central portion of the core metal 3, and between this meshing engagement portion 16 and the meshing engagement portion 16 of the adjacent core metal 3. A meshing engagement hole 7 into which the teeth of the starting wheel are inserted is formed in the rubber portion of the rubber crawler belt 1 at the center in the width direction.

Next, in the rubber 2 on the lower side of the wing portion 3a of the core metal 3 shown in FIG. 3, a steel cable 17 is provided close to the lower surface of the wing portion 3a over the entire length of the rubber crawler belt 1 in the front-rear direction. It is buried along the width direction of. Wings corresponding to this cable 17
In the rubber 2 on the upper surface of 3a, a bias 18 crossing a steel cord is embedded on the wing portion 3a along the width direction of the wing portion 3a over the entire length of the rubber crawler belt 1 in the front-rear direction.

As a result, the rigidity of the rubber crawler belt is improved, and the rubber crawler belt 1 is less likely to expand. Therefore, the lateral displacement of the rubber crawler belt 1 can be suppressed by the lateral force acting on the rubber crawler belt during turning.

As a result, it is possible to prevent the rubber 2 and the core metal 3 from peeling off and the rubber crawler belt from coming off.

FIG. 4 shows a state in which the rubber crawler belt 1 according to the present invention is attached to the underbody portion of the vehicle body 19 so that the lug 9 has a substantially V shape when viewed from the front of the vehicle body 19. In this way, not only the traction force becomes large, but also soil removal can be improved.

(Effects of the Invention) As described above, the rubber crawler belt according to the present invention has the following effects.

(1) Since the shape of the lug is continuous over the entire length in the belt-like direction, and the branch portion is formed so as to extend over three or more core metal projection surfaces, it is possible to take a large contact area of the lug. As a result, the ground contact load is dispersed, the surface pressure at the top of the lug is reduced, and the wear life of the lug is extended.

(2) In the staggered arrangement of lugs, the area of the recess between the adjacent lugs can be made large, and as a result, the amount of soil retained increases, the shearing force of the soil increases, and the traction force of the vehicle increases.

(3) Further, since the recesses between the lugs are provided with a bottom portion continuing from the steep slope to the gentle slope, the shear force of the soil in the three-dimensional direction is obtained, so that the traction force can be further increased.

(4) Since the shape of the lug is continuous over the entire length in the belt-like direction as described above, the rigidity of the rubber crawler belt is high and the vibration of the vehicle body is reduced. It is possible to increase the traction force of the vehicle without doing so.

(5) Also, the shape of the recess of the lug is such that as it goes to the end of the track,
Since the shape is enlarged (spreading out), soil can be easily discharged, and there is no slippage of the crawler due to clogging between the lugs unlike conventional rubber crawler tracks, and traction wear is reduced as traction increases.

[Brief description of drawings]

FIG. 1 shows an embodiment of a rubber crawler belt lug according to the present invention. (A) is a plan view seen from the ground side, (b) is a side view of (a), and FIG. 2 is the inside of the rubber crawler track. The plan view seen from above. Third
FIG. 4 is a sectional view taken along the line AA in FIG. 2, FIG. 4 is a front view showing a state where the rubber crawler belt of the present invention is mounted on the vehicle body, and FIG. A side view and FIG. 6 are sectional views showing the structure of a conventional rubber crawler belt. (Explanation of symbols) 1 ... rubber crawler belt, 2 ... rubber, 3 ... core metal, 3a ... wing portion, 7 ... interlocking engagement hole, 9 ... lug, 9a ... top portion, 10,1
0a, 11,11a …… Branch part, 12 …… Concave part, 19 …… Body, 20a
... steep, 20b ... gentle, 20c ... bottom.

Claims (10)

[Claims] Claim: What is claimed is: 1. A meshing engagement portion with a starting wheel and a metal core having a rolling rail surface of a rolling wheel are arranged in parallel in a belt-like direction at a pitch that meshes with all the teeth of the starting shaft tooth, and a center in the width direction. In the rubber crawler track in which a meshing engagement hole with the starting wheel is provided between the cores adjacent to each other,
The lug provided on the ground contact surface side is composed of a widthwise central portion and a branching portion that is distant from the widthwise central portion toward the end face in the left-right direction, respectively, to form a continuous lug over the entire length in the strip-shaped direction, and the branching portion. Is a rubber crawler track characterized in that it is formed so as to straddle three or more core metal projection surfaces, and the left and right branch parts are arranged in a zigzag pattern. 2. The lug has a meshing engagement hole formed by a central portion provided between adjacent meshing engagement holes and a branch portion continuous with two adjacent central portions sandwiching the meshing engagement hole. 2. The rubber crawler belt according to claim 1, wherein the rubber crawler belt is formed so as to surround the three sides and is continuous in a zigzag manner over the entire circumference in the belt-like direction. 3. The rubber crawler belt according to claim 1, wherein the branch portions of the lugs are arranged so as to be staggered with respect to each other by shifting one core bar from each other by one pitch. 4. The rubber crawler belt according to claim 1, wherein the branch portion of the lug is formed so as to continuously and obliquely cross three or more adjacent core metal projection surfaces. 5. The branch portion of the lug diagonally crosses three or more adjacent metal bar projection planes continuously and diagonally, and diagonally from the center to the end in the width direction at the ground contact surface. 5. The rubber crawler belt according to claim 1, wherein the rubber crawler belt is formed so as to move away from the rubber crawler. 6. The strip-shaped length of the branch portion of the lug is formed so as to become gradually shorter as it goes away from the center portion of the crawler belt toward the left and right end portions.
The rubber crawler track according to 5 above. 7. The branch portion of the lug is characterized in that one of the slopes formed between the top surface and the base of the lug has a gentle slope on one of the front and rear sides in the strip-like direction and the other has a steep slope. 1
The rubber crawler belt according to any one of 6 to 6. 8. The gentle slope of the slopes formed between the top surface and the base of the branched portion of the lug becomes gradually gentle as it goes away from the center of the crawler belt toward the left and right ends. The rubber crawler track according to claim 7, wherein the rubber crawler track is formed as described above. 9. The rubber crawler belt according to claim 1, wherein the lug is formed such that the left and right branch portions both traverse the portion between the adjacent cores at two or more locations. 10. A recess formed between the lug and an adjacent lug has a triangular shape or a trapezoidal shape in which the end is wider than the center in the crawler belt width direction and the cross section is rounded at the bottom. 9. The rubber crawler belt according to claim 7, wherein