JPH03235766A - Lug pattern for rubber crawler - Google Patents

Abstract

PURPOSE:To increase a traction force and to reduce the generation of vibration and noise by locating a lug to the parts on both sides of the projection surface of a core, locating the lug astride a plurality of the adjoining core projection surfaces, and causing the lug to cross both parts in the direction of width between the adjoining cores. CONSTITUTION:A rubber crawler is formed such that metallic cores 2 engaged with every tooth of a starting wheel are embedded in parallel in an endless rubber belt 1. In this case, an engaging hole 9 engaged with a starting wheel is formed between the adjoining cores at the central part in the direction of width of the rubber crawler, and this constitution escapes the addendum of the starting wheel. Lugs are formed on the earthing surface side of the rubber crawler, each comprising a central part 10 in the direction of width and branch parts 11 parting away from the central part obliquely rearwardly toward the end parts on both sides. The branch parts 11 cross each other at the central part 10, and are formed astride three core projection surfaces adjoining to each other. The branch parts 11 on both side are caused to cross the core projection surface between the adjoining cores and in one or more spots on both sides in the direction of width.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to lug patterns for rubber tracks, and particularly to rubber tracks wrapped around tracked vehicles such as construction machines such as bulldozers and hydraulic excavators. Regarding the lag pattern.

[Prior Art] Conventionally, in tracked vehicles such as construction machinery such as bulldozers and hydraulic excavators, lower rollers and lower rollers are mounted on a track frame provided between an idler wheel and a starting wheel. A steel layer band is wrapped around each of these wheels, and the power transmitted to the starting wheel rotates the crawler track to make the vehicle run.

In recent years, as a countermeasure for noise and vibration in the undercarriage, instead of the conventional iron layer belt, metal cores are embedded at regular intervals in an endless rubber belt, and the teeth of the driving wheel are engaged with these cores to drive the integrated type. Rubber tracks are also used.

By the way, the iron layer generally meshes with a starting wheel with an odd number of teeth, with one tooth at a time. This is because if the number of teeth on the starting wheel is set to an odd number, each rotation of the crawler belt will mesh with the next tooth shifted by one pitch, thereby reducing wear on the teeth on the starting wheel.

However, as vehicles become larger, in the case of conventional iron layer belts,
l In tooth-jumping meshing, the link pitch of the track becomes large, and when the track is wrapped around the starting wheel or idler wheel, a large bending angle is created with respect to the adjacent link, making the crawler polygonal, and the link becomes the starting wheel or idler. The drawback is that the noise and vibration of the track caused by collision with the wheels increases.

This phenomenon also occurs in rubber tracks, and in addition to this, if the bending angle of the track is large when the track is wrapped around the starting wheel or idler wheel, the distortion of the lugs provided on the contact surface side becomes large and cracks are likely to occur. This reduces the durability of the track.

In addition, in the case of iron-layered tracks, more than half of the total driving force is transmitted to the crawler track by one tooth of the starting wheel, and it was thought that the same would be true in the case of rubber tracks. For this reason, the adhesive strength between the core metal and the rubber must be sufficiently strong, and the area of the left and right wing portions of the core metal is increased to ensure adhesive strength. the result,
The length in the longitudinal direction of the core metal wings is larger than the spacing between the tips of the teeth of the driving wheel, and the core metals cannot be arranged at such intervals that the metal cores can be engaged with each tooth of the driving wheel. This results in a large rubber crawler track with a parallel pitch and one-tooth meshing. In this kind of track, the distance between the rolling wheel transfer rail surfaces provided on each core metal becomes large, and the lower rolling wheels fall between the transfer rail surfaces as they run, which causes running vibration. ing.

In order to solve these drawbacks of rubber tracks, so-called short-pitch rubber tracks have been manufactured in which the core metal is arranged in the teeth of the driving wheel so that all the teeth mesh at every pitch, instead of skipping one tooth at a time. There is.

Naturally, the longitudinal length of each part of the core metal in a short-pitch rubber crawler track becomes shorter, and a decrease in the projected area of the left and right wing parts of the core metal results in a decrease in the adhesive strength between the rubber belt and the core metal. However, it has recently been discovered that the transmission of driving force from the starting wheel to the rubber crawler track is carried out in a distributed manner across the meshing teeth of the starting wheel, although there are some fluctuations. Therefore, even if a small core metal having a lower adhesive strength per core metal than the conventional one is used, it can withstand the driving force from the starting wheel.

Furthermore, in order to compensate for the disadvantage of being susceptible to peeling loads between the smaller core metal and rubber, steel cords, fiber cords, etc. are buried above and below the wing section, and the driving force is transferred from the starting wheel through the core metal to the core metal. In addition to ensuring the shear strength between the core metal and the rubber in the driving force transmission path that extends to the rubber that is in contact with the core metal and then to the steel cord buried beneath the core metal, the rigidity of the crawler track is also improved.

[Problem to be solved by the invention] However, in the case of a rubber crawler track in which lugs provided on the contact surface side are installed independently for each core metal, and a group of lugs is provided between the core metals, the lug In order to ensure wear life, that is, to reduce lug surface pressure, the ground contact area of the lugs must be increased, and if the tracks are short pitched as described above, the degree of freedom in the lug shape will be reduced, and it will be difficult to remove soil. Since the area of the group to be sheared cannot be large, the traction force will be reduced. There are other problems as follows.

(1) When running, the lower roller falls between the core metals,
The car body vibrates.

(2) When the rubber track wraps around the starting wheel or idler wheel and bends, the rigidity of the group of lugs provided between the core metals is low, so the bending distortion in this part is large, and the track also produces pounding noise and flapping. Likely to happen.

(3) Since the lugs are provided independently for each core metal, they bite into the ground intermittently, increasing the vibratory force of the crawler track.

In addition, there is a known short-pitch rubber track in which lugs are provided on the left and right sides so as to almost cover the projected surfaces of the left and right wing parts of two adjacent core metals, and the left and right lugs are shifted by one pitch from each other. There is.

However, in the case of this type of track, there are places where the lugs are not continuous between the core metals due to a one-pitch shift to the left and right, so the rigidity of the rubber part between the core metals is significantly unbalanced on the left and right, and this rubber track is used for the starting wheels and idlers. When the track wraps around the track and bends, there is a risk that the track will twist and break at the discontinuous part of the lug. Another problem is that when the lower roller rides between the core metals, it falls into the discontinuous portion of the lug.

The present invention has focused on the above-mentioned conventional problems, and aims to provide a lug pattern of a rubber crawler track that increases traction force, reduces vibration/noise and bending distortion during vehicle running, and has good durability.

[Means for Solving the Problems] In order to achieve the above object, the lug pattern of the rubber crawler track according to the present invention includes a metal core metal that meshes with each tooth of the driving wheel on an endless rubber belt that is wrapped around the running part. In the rubber crawler track of a tracked vehicle that is embedded in the rubber track, a hole for engaging the starting wheel is provided between adjacent core metals at the center in the width direction, and lugs provided on the ground contact side are placed on the left and right portions of the projection surface of the core metal. 1 each
At least one lug is present across the projection plane of a plurality of adjacent core metals, and in the area between adjacent core metals, the lug crosses at one or more places on both the left and right sides in the width direction. In addition to the basic configuration,
A portion of the lug may be formed into a continuous surface around the entire circumference of the rubber track.

As a specific lug pattern for the above basic configuration, the lug is composed of a central part in the width direction of the rubber crawler track, and branch parts that extend diagonally backward from the central part toward the left and right ends, The branch parts are formed to intersect with each other at the center in the width direction, or the lugs are sandwiched between two circular arcs centered at the center in the width direction of the rubber track, or the lugs are in the form of a band. are provided at both left and right ends along the winding direction of the rubber crawler track, and between the center part in the width direction and the left and right ends, and the inner lugs are shifted by one pitch of the core metal with respect to the lugs at both the left and right ends. The installed one or the lug is composed of a central part in the width direction of the rubber crawler track and branch parts that diagonally move away from the central part toward the left and right ends,
The left and right branch parts are arranged parallel to each other, or the lug is continuous between the central part provided between adjacent meshing engagement holes and the two adjacent central parts with the meshing engagement holes in between, It consists of branching parts that move away diagonally backward toward the left and right ends of the rubber crawler track, and the branching parts are arranged so that they are shifted by one pitch of the core bar on the left and right, and the longitudinal length of each part of the top surface of the lug at the branching part is The length is set so that it gradually becomes shorter as it moves away from the center of the track toward the left and right ends, and correspondingly, the longitudinal length of each group formed between the top surfaces of adjacent lugs is The lug is set so that it gradually becomes longer as it moves away from the center part toward the left and right ends, and the lug is formed so that the center part of the lug and the branch part continuous to the lug mesh to surround three sides of the engagement hole. The top surface is continuous in a staggered pattern, or lugs are provided at the center and both ends of the rubber track in the width direction so as to go around the outer circumference of the rubber track without a break, and both of these lugs are arranged in the winding direction. A strip parallel to
Alternatively, the lug is composed of a central part in the width direction of the rubber track, and branch parts that extend diagonally backward from the central part toward the left and right ends, and the central part goes around the outer periphery of the rubber track without a break. The rubber crawler belt may be provided in a belt shape parallel to the front-rear direction, and the branch portions may be formed so as to intersect with each other at the center in the width direction.

[Function] According to the above configuration, the lugs are provided at one or more locations on each of the left and right portions of the projection surface of the core metal, and the lugs are formed so as to extend over a plurality of adjacent projection surfaces of the core metal. The degree of freedom in lug shape is greater than when using one lug with one cored metal, and it becomes possible to select a lug pattern with the optimal shape depending on the purpose, such as improving traction force or preventing skidding.

In addition, since the lug crosses the area between adjacent core metals at one or more locations on both the left and right sides in the width direction, the supporting force of the lower rolling shaft between the core metals increases on both the left and right sides, and In particular, if part of the lug is formed on a continuous surface over the entire circumference of the rubber track, the amount of depression between the core metal of the lower roller will be very small, and the vibration is drastically reduced.

Furthermore, the rigidity of the track increases, preventing the track from twisting or coming off, and the damping force at the bending part increases when the track bends, which reduces the collision of the track with the starting wheel and idler wheel, and prevents the track from coming off. The tapping sound becomes smaller.

The arcuate lugs of claims (3), (7), (9) and claim (4), in which the branching parts of the lugs intersect at the center in the width direction of the crawler track, are continuous from the center to the left and right ends when the vehicle moves forward. By reducing vibration, the soil trapped between the lugs can be used as a traction force without destroying it.

In addition, in the case of claim (5) and claims (7), (8), and (9), which include continuous lugs on the outer periphery of the crawler track, the straightness of the vehicle is good, so it may skid even on slopes, soft ground, etc. It's hard to do.

[Example 7] Examples of the lug pattern of the rubber track according to the present invention will be described in detail below with reference to the drawings.

In FIG. 1(a) and FIGS. 3 to 8, the top surface of the lug is shaded.

FIG. 1(a) is a partial plan view of a rubber track provided with a lug pattern according to claim (3), and this rubber track has an endless rubber belt 1 and a metal core 2 that meshes with each tooth of the driving wheel. They were buried in parallel.

As shown in FIG. 2, these core metals 2 are provided with a meshing engagement portion 3 with a starting wheel at the center in the width direction, and a guiding protrusion 4, a transfer rail surface 5, and a wing portion 6 on both left and right sides of the core bar 2, respectively. Rubber bells) 10 are installed at right angles to the front-rear direction and at regular intervals. The guiding protrusion 4 and the transfer rail surface 5
are provided offset from each other in the longitudinal direction with respect to the meshing engagement portion 3 and the wing portion 6. In addition, a large number of steel cords 7 are buried in the front and back direction close to the lower surface of the core metal 2 so as to go around the crawler track, and a large number of steel or synthetic resin cords 8 are located close to the upper surface of the wing portion 6 of the core metal 2. is buried in the front and rear direction so as to go around the track.

A meshing engagement hole 9 for engaging the starting wheel is provided between adjacent core metals at the widthwise central portion of the rubber track, and a meshing engagement portion 3 provided at the widthwise central portion of the core metal 2 is activated. When engaged with the teeth of the wheel, the tooth tips of the starting wheel are allowed to escape through the meshing engagement hole 9.

The lugs formed on the contact surface side of the rubber crawler track are composed of a central portion 10 in the width direction of the crawler track, and branch portions 11 that extend diagonally backward from the center portion 10 toward the left and right ends, and each branch portion 11 are formed so as to intersect with each other at the central portion 10 and to span the projection planes of the three adjacent core metals. Further, in the portion between adjacent core metals, branch portions 11 of the lugs are formed to cross at one or more locations on both the left and right sides in the width direction.

As a result, each core metal is equally supported by the lugs on both the left and right sides.Furthermore, since the transfer 1 nozzle surface 5 is offset in the front and rear direction, the downward rotation axis is located between the core metals. Even if you ride it, the amount of drop will be very small.

A central portion 10 of the lug is provided at every other interlocking engagement hole 9 . A group 12 is formed between adjacent lugs, and when the vehicle is moving forward, the top surface 13 of the lug contacts the ground in sequence from the central portion lo to the branch portion 11, and during this time, the central portion 10 of the next lug contacts the ground, so that the lug does not touch the ground. On the other hand, it will always touch the ground continuously without any breaks.

Therefore, the intermittent digging into the ground that occurs in the conventional case of one core metal and one lug is eliminated, and crawler track vibration is reduced.

The slope formed at the boundary between the lug top surface 13 and the bottom surface 14 of the group 12 is as shown in FIG. The angle β between the side slope 16 and the lug top surface 13 is made larger than that to act as a force that pushes the sheared soil downward and backward.

If the height from the bottom surface 14 of the group to the top surface 13 of the lug, the material of the rubber, the shape of the core metal, etc. are changed, the distortion of the rubber during bending of the crawler track becomes large, and if there are concerns about durability, set a preset angle in advance. Alternatively, a minimum recess 17 may be provided in a portion of the lug top surface 13 as shown in FIG. 1(C).

FIG. 3 is a partial plan view of a rubber crawler track provided with a lug pattern according to claim (4), in which the lug has a shape sandwiched between two circular arcs having a center at the center in the width direction of the crawler track. The two arcs have different center positions and radii, and the longitudinal length of each part of the top surface of the lug is greatest at the center and becomes smaller as it moves away from the left and right ends. A meshing engagement hole is provided in the widthwise center of the rubber crawler track for allowing the tips of the teeth to escape when the rubber crawler is engaged with the starting wheel, and the center portion of the lug is provided between these meshing and engagement holes. Groups are formed between adjacent lugs.

Similar to the embodiment of claim (3), the surface formed at the boundary between the top surface of the lug and the group is such that the angle between the front surface and the top surface of the lug is the same as the angle between the rear surface and the top surface of the lug. It is formed so that it is larger than the angle it makes.

FIG. 4 is a partial plan view of a rubber crawler track equipped with a lug pattern according to claim (5), in which belt-shaped lugs are provided in the front and rear direction between the left and right ends of the rubber track, and between the widthwise center and left and right ends. is provided. These lugs, arranged in four rows in the front-rear direction, all straddle three core metals, and the two inner rows of lugs are offset by one pitch between the core metals with respect to the lugs at both left and right ends. ing.

FIG. 5 is a partial plan view of a rubber crawler track equipped with a lug pattern according to claim (6), in which the lugs include a central portion in the width direction of the rubber crawler track, and branch portions that diagonally move away from the central portion toward the left and right ends. It consists of

The central portion is provided between the meshing engagement holes through which the tips of the teeth can escape when engaged with the driving wheel, and the left and right branched portions are arranged parallel to each other.

FIG. 6 is a partial plan view of a rubber crawler track equipped with a lug pattern according to claim (7), in which the lugs are arranged in adjacent meshing engagement holes 9,
The central portion l provided between 9.

and two central portions 1 that are adjacent to each other with the interlocking engagement hole 9 in between.
0.10, and branch portions 11 that extend diagonally backward toward the left and right ends of the rubber crawler belt.

This branching part 11 is arranged so that the left and right sides are shifted from each other by one pitch of the core metal, so the left and right sides are asymmetrical with respect to the center line in the width direction of the crawler track. It is formed so as to continuously cross the projection plane of the core bar in the diagonal rear direction. Further, the central portion 10 of the lug and the branch portion 11 continuous to the central portion 10 engage with the engagement hole 9.
The top surface of the lug, which is formed in a U-shape surrounding three sides of the rubber track, continues in a staggered manner all around the rubber crawler track.

The length in the front-rear direction of each part of the top surface of the lug in the branch part 11 is as follows:
The length of each part of the group 12 formed between the top surfaces of adjacent lugs is set to be gradually shorter as it moves away from the center of the track toward the left and right ends. It is set so that it gradually becomes longer as it moves away from the left and right ends. Also,
On the front slope 15 of the lug, the slope formed at the boundary between the top surface of the lug and the bottom surface 14 of the group provided at a constant depth from the top surface gradually increases as it moves away from the center toward the ends. The rear slope 16 of the lug has a flat surface with a gentle slope angle, and the rear slope 16 of the lug has a flat surface with the same slope angle from the center to the end.

FIG. 7 is a partial plan view of a rubber crawler track provided with a lug pattern according to claim (8), in which the lugs are arranged at the center and both ends of the rubber track in the width direction so as to go around the outer periphery of the rubber track without a break. It is provided.

All of these lugs are strip-shaped parallel to the front-rear direction, with the center lug being wider than the lugs at both ends, and provided with meshing engagement holes for allowing the tips of the teeth to escape when meshed with the starting wheel.

FIG. 8 is a partial plan view of a rubber crawler track provided with a lug pattern according to claim (9), in which the lugs are located at the widthwise central portion of the crawler track;
It consists of branching parts that go away diagonally backward from the center part toward the left and right ends, and the center part is provided in a band shape parallel to the front-rear direction of the rubber track so as to go around the outer circumference of the rubber track without a break. . A meshing engagement hole is provided in the widthwise central portion of this lug for allowing the tooth tips to escape when the lug meshes with the starting wheel. Further, the shape of the branch portion is the same as that in the embodiment of claim (3).

The embodiment of claim (3) shown in FIG. 1, the embodiment of claim (4) shown in FIG. 3, the embodiment of claim (7) shown in FIG. 6, and the embodiment of claim (7) shown in FIG. In the embodiment of claim (9), the shape of the lug has directionality with respect to the longitudinal direction of the crawler belt, and a large traction force can be exerted when the vehicle moves forward. Further, in the case of the embodiment of claim (7) shown in FIG. 6, the lug group becomes wider as it approaches the left and right ends of the crawler track, so that soil can be easily discharged. In the case of the embodiment of claim (5) shown in FIG. 4, the embodiment of claim (6) shown in FIG. 5, and the embodiment of claim (8) shown in FIG. Although it is somewhat inferior, it is resistant to skidding and has excellent straight-line performance of the vehicle.

[Effects of the Invention] As explained above, according to the present invention, it is a prerequisite that the rubber crawler track has a metal core embedded therein that can mesh with each tooth of the starting wheel, and the rubber crawler track is formed on the ground contact side. At least one lug is provided on each of the left and right portions of the projection surface of the core metal, and the lugs are present across a plurality of adjacent projection surfaces of the core metal, and the lugs in the width direction are provided in the portion between adjacent core metals. The basic configuration is that the lugs cross at one or more places on both the left and right sides, so the degree of freedom in lug shape has increased dramatically compared to conventional models, allowing the creation of lugs with various shapes that correspond to the operating conditions of the vehicle. You will be able to do it.

As a result, great effects can be obtained as described below.

(1) The amount of fall of the downward rotation axis between the core metals is reduced,
Vibrations applied to the operator and the ground are significantly reduced.

2) The rigidity of the crawler track increases, causing the track to twist and flap.
In addition to preventing the crawler from coming off, the damping force of the bent portion increases when the crawler bends, so collision of the crawler with the starting wheel and idler wheel is alleviated, and the noise of the crawler hitting is reduced. Further, by reducing the number of bent portions of the rubber belt, breakage of the rubber track can be prevented.

(3) By improving the shape of the lug top surface and the group and reducing the vibration described above, the driving force can be effectively transmitted to the ground without destroying the soil captured by the group, and the traction force can be improved.

(4) The frequency of track slippage is reduced due to reduced track vibration and improved traction, which reduces lug wear and improves the durability of the rubber track.

[Brief explanation of drawings]

FIG. 1(a) is a partial plan view of the rubber track according to the embodiment described in claim (3) as viewed from the ground contact side, FIG. 1(b) is a view taken along the X arrow in FIG. 1, and FIG. View from the X arrow in the figure, Figure 2 (a)
is a partial plan view of the rubber track shown in Fig. 1(a), viewed from the wheel rolling surface side, and (b) is a partial plan view taken from A-A in Fig. 2(a).
The sectional views and FIGS. 3 to 8 are all explanatory diagrams of the lug pattern of the rubber track according to the embodiment as seen from the ground contact side, and FIG. 3 is an embodiment according to claim (4), and FIG. An embodiment according to claim (5), FIG. 5 shows an embodiment according to claim (6), FIG. 6 shows an embodiment according to claim (7), and FIG. 7 shows an embodiment according to claim (8). Example FIG. 8 shows an embodiment according to claim (9). 1...Rubber belt 2...Core bar 9...Meshing engagement hole 10...Central part 11...Branch part 12 No.◆ φ◆Fist Group

Claims (9)

[Claims] (1) In the rubber crawler track of a tracked vehicle, in which a metal core metal that meshes with each tooth of the starting wheel is embedded in an endless rubber belt wrapped around the running part, the engine starts between adjacent core metals in the center of the width direction. In addition to providing an engagement hole for meshing with the ring, one or more lugs provided on the ground surface side are provided on each of the left and right portions of the core metal projection surface, and the lugs are present across a plurality of adjacent core metal projection surfaces. Also, a lug pattern of a rubber crawler track characterized in that in a portion between adjacent core metals, the lug crosses at one or more places on both the left and right sides in the width direction. (2) A lug pattern for a rubber crawler according to claim (1), wherein a part of the lug is formed on a continuous surface over the entire circumference of the rubber crawler. (3) The lugs are composed of a central portion in the width direction of the rubber crawler track, and branch portions that extend diagonally backward from the center portion toward the left and right ends, and the branch portions intersect with each other at the center portion in the width direction. Claim (1) characterized in that
Rubber track lug pattern shown. (4) The lug pattern of the rubber crawler track according to claim (1), wherein the lug has a shape sandwiched between two circular arcs having a center at the center in the width direction of the rubber track. (5) Belt-shaped lugs are provided at both left and right ends along the front-rear direction of the rubber crawler track, and between the center part in the width direction and the left and right ends, and the inner lugs are attached to the core with respect to the lugs at both left and right ends. 1
A claim characterized in that the installations are shifted by a pitch (
1) Lug pattern of the rubber track described. (6) A claim characterized in that the lug is composed of a central part in the width direction of the rubber crawler track and branch parts that diagonally move away from the central part toward the left and right ends, and the left and right branch parts are arranged parallel to each other. Lug pattern of the rubber crawler track described in item (1). (7) The lugs are connected to the central part provided between the adjacent meshing engagement holes and the two adjacent central parts with the meshing engagement holes in between, and diagonally toward the left and right ends of the rubber crawler track. The branching parts move away from each other in the rear direction, and the branching parts are arranged so that they are shifted by one pitch of the core bar on the left and right, and the length of each part of the top surface of the lug at the branching part is set from the center of the track to the left and right ends. Correspondingly, the length in the longitudinal direction of each group formed between the top surfaces of adjacent lugs is set so that it becomes gradually shorter as it moves away from the center of the crawler track toward the left and right ends. The lug is set so that it gradually becomes longer as it moves away from the lug, and the top surface of the lug, which is formed by the central part of the lug and the continuous branch part to surround the three sides of the engagement hole, continues in a staggered manner. The lug pattern of a rubber crawler track according to claim (2), characterized in that: (8) Lugs are provided at the center and both ends of the rubber track in the width direction so as to go around the outer circumference of the rubber track without a break;
3. The lug pattern of a rubber crawler track according to claim 2, wherein each of these lugs is in the form of a belt parallel to the front-rear direction. (9) The lugs are composed of a central part in the width direction of the rubber crawler track, and branch parts that extend diagonally backward from the central part toward the left and right ends, so that the central part goes around the outer periphery of the rubber track without a break. 3. The lug pattern of a rubber crawler according to claim 2, wherein the rubber crawler is provided in a strip shape parallel to the front-rear direction of the rubber crawler, and the branched portions are formed so as to intersect with each other at a central portion in the width direction.