JP2528014B2 - Rubber track rug pattern - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rubber crawler track lug pattern, and more particularly to a rubber crawler belt wound around a tracked vehicle such as a construction machine such as a bulldozer or a hydraulic excavator. Regarding rug patterns.

[Prior Art] Conventionally, in tracked vehicles including construction machines such as bulldozers and hydraulic excavators, upper and lower rolling wheels are mounted on a track frame provided between an idle wheel and a starting wheel. Wearing each of these wheels, an iron crawler belt is wound around each of these wheels, and the crawler belt is rotated by the power transmitted to the starting wheel to drive the vehicle. In recent years, as a measure against underbody noise and vibration, instead of the conventional iron crawler belt, an endless rubber belt is embedded with metal cored bars at regular intervals, and the cored wheels are driven by engaging the teeth of the starter wheels. Rubber tracks are also used.

By the way, the iron crawler belt is generally meshed with the starter wheel having an odd number of teeth by skipping one tooth. This is because if the number of teeth of the starting wheel is odd, it will mesh with the next tooth that is offset by one pitch for each revolution of the crawler belt, and wear of the teeth of the starting wheel can be reduced.

However, as the size of the vehicle increases, in the case of the conventional iron crawler track, the link pitch of the crawler belt increases with one tooth jump, and when the crawler belt is wound around the starter wheel or the idler wheel, a large bending occurs with respect to the adjacent link. There is a drawback that the crawler belt becomes polygonal due to the formation of the corners, and the noise and vibration of the crawler belt generated when the link collides with the starting wheel and the idler wheel become large.

This phenomenon also occurs in rubber crawler belts, and in addition, when the crawler belt is wound around the starting wheel or idler wheel and the bending angle of the crawler belt is large, the strain of the lug provided on the ground contact side becomes large and cracks easily occur. And reduce the durability of the track.

Further, in the case of the iron crawler belt, one tooth of the starting wheel transmits more than half of the total driving force to the crawler belt, and it was considered that the same applies to the case of the rubber crawler track. 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 wings of the core metal is increased to secure the adhesive strength. As a result, the length in the front-rear direction of the cored bar blade portion becomes larger than the tooth tip interval of the starting wheel, and the cored bar can be arranged at intervals so that the cored bar can be meshed with each tooth of the starting wheel. I can't
A rubber crawler belt with a large pitch of parallel pitches that meshes with one tooth skip. In such a crawler track, the distance between the rolling wheel rolling rail surfaces provided on each core metal becomes large, and the lower rolling wheel runs while falling between the rolling rail surfaces. Has become.

In order to solve such a defect of the rubber crawler belt, a so-called short-pitch rubber crawler belt is manufactured in which a core metal is arranged so that all teeth are meshed at every pitch, instead of one tooth being jumped to the teeth of the starting wheel. There is.

The length in the front-rear direction of each part of the cored bar in the short-pitch rubber crawler track is naturally shortened, and the reduction of the projected area of the left and right wing parts of the cored bar causes a reduction in the adhesive strength between the rubber belt and the cored bar. However, recently, it has been found that the driving force is transmitted from the starting wheel to the rubber crawler belt in a distributed manner among the teeth of the engaging starting wheel, although there is some variation. Therefore, even if a small cored bar having a lower adhesive strength per cored bar than the conventional one is used, the driving force from the starting wheel can be endured.

Furthermore, in order to compensate for the weakness against the peeling load between the miniaturized core metal and rubber, steel cords, fiber cords, etc. are embedded above and below the wings, and the driving force is passed 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 voltage path to the steel cord embedded under the core metal, the rigidity of the crawler track is improved.

[Problems to be Solved by the Invention] However, in the case of a rubber crawler in which a lug provided on the ground contact surface side is independently installed for each core metal, and a groove of the lug is provided between the core metal, To ensure wear life
In other words, it is necessary to increase the contact area of the lug in order to reduce the lug surface pressure, and if the crawler belt is made to have a short pitch as described above, the degree of freedom of the lug shape decreases and the area of the groove that shears the soil also increases. As it cannot be removed, the traction force will be reduced. There are also the following problems.

(1) When traveling, the lower wheel falls between the core metal,
The car body vibrates.

(2) When the rubber crawler belt is wound around the starter wheel or the idler wheel and is bent, the rigidity of the groove of the lug provided between the cores is low, so the bending distortion of this part is large, and the clap sound and fluttering of the crawler track are reduced. Likely to happen.

(3) Since each lug core bar is provided independently, the lug core bites into the ground intermittently, and the vibration force of the crawler belt increases.

Also, in a short-pitch rubber crawler track, a rubber crawler track is known in which lugs are provided on the left and right sides so as to substantially cover the projection planes of the left and right wing portions of two adjacent cores, and the left and right lugs are offset from each other by one pitch. There is. But with this track,
Since there is a part where the lugs do not continue between the cores with a 1 pitch shift to the left and right, the rigidity of the rubber part between the cores becomes significantly unbalanced on the left and right, and when this rubber crawler is wrapped around the starter wheel or idler wheel and bent. , The track may be twisted and broken from the discontinuous portion of the lug. Further, when the lower rolling wheel rides between the cored bars, there is an inconvenience that it falls to the discontinuous portion side of the lug.

The present invention focuses on the above-mentioned conventional problems, increases the traction force, and reduces vibration and noise and bending strain during vehicle running,
An object is to provide a rubber crawler rug pattern having good durability.

[Means for Solving the Problems] In order to achieve the above object, the first aspect of the present invention is to embed a metal cored bar that meshes with each tooth of a starter wheel in an endless rubber belt wound around a running portion, and contact the endless rubber belt. In a rubber crawler rug pattern having a lug on the ground side, the outer circumference of the crawler track is made one round without a break, and the central part arranged with a predetermined width in the widthwise central part of the crawler belt and the left and right of the central part. The second aspect of the present invention is based on the first invention, and is a crawler belt of left and right branch portions, the branch portion having a predetermined width from the end portion and being separated from the end portion by a predetermined distance. The position of the end on the side of the center of the crawler belt in the front-rear direction of the crawler belt is the same position, and the third aspect of the present invention is based on the first invention, in which the left and right branch parts are arranged in the front-rear direction of the crawler belt. The present invention is characterized in that they are arranged so as to be offset by one pitch of gold. A fourth aspect of the present invention is characterized in that the branching portion is provided straddling three core metal projection surfaces adjacent to each other mainly based on the first, second, and third inventions. In a rubber crawler track lug pattern in which an endless rubber belt wound around a running portion is embedded with a metal cored bar that meshes with each tooth of a starting wheel and a lug is provided on the ground contact surface side, the lug patterns are both widthwise end portions. It is characterized in that it has an inverted V-shape with a higher central portion, is arranged with a predetermined width over the entire circumference of the crawler belt and is spaced a predetermined distance, and straddles three adjacent core bar projection planes. A sixth aspect of the present invention is to embed a metal cored bar that meshes with each tooth of a moving wheel in an endless rubber belt that is wound around a running portion, and use a lug pattern in a rubber crawler track that has a lug on the ground contact side. With the center of the rubber crawler belt in the width direction so that the circumference of the rubber crawler track goes around without interruption. Respectively provided on the end,
Each of these lugs is in the form of a strip parallel to the front-rear direction. The seventh aspect of the present invention is to provide an endless rubber belt wound around a running portion with a metal cored bar that meshes with each tooth of the starting wheel. In the rug pattern of the rubber crawler track which is embedded and has a lug on the ground contact side, the strip-shaped lugs are provided in the front-rear direction of the rubber crawler track so as to be spaced apart from each other on the left and right sides and between the widthwise central part and the left and right end parts. The lug straddles three adjacent projection planes of the core metal, and the inner lug is set to be offset from the outer lug by one pitch in the front-rear direction of the crawler belt. Is an endless rubber belt wound around a running part, in which a metal cored bar that meshes with each tooth of the starting wheel is embedded, and the lug has a lug on the ground contact side. Central part and left and right edges from the central part And the left and right branch parts are parallel to each other, and the left and right branch parts straddle three adjacent metal core projection planes. Characterize.

[Operation] According to the above configuration, the lugs are provided at one or more locations on the right and left portions of the core metal projection surface, respectively, and the lugs are formed so as to extend over a plurality of adjacent core metal projection surfaces. Of 1
The degree of freedom of the lug shape is greater than that of the one core metal lug, and it is possible to select the lug pattern having the optimum shape according to the purpose, such as improving the traction force and preventing skid.

In addition, the lugs are arranged so that the lugs cross the portion between the adjacent cores at one or more positions on the left and right in the width direction. The amount of depression into the space is small, and especially when part of the lug is formed on the surface that is continuous over the entire circumference of the rubber crawler track, the amount of depression into the space between the core metal of the lower roller is very small,
Vibration during driving is drastically reduced.

Further, the rigidity of the crawler belt is increased to prevent the crawler belt from twisting and coming off, and the damping force of the bending portion is increased when the crawler belt is bent. The tapping sound becomes smaller.

The arcuate lugs of claims (3), (7), (9) and claim (4) in which the branch portions of the lugs intersect at the widthwise central portion of the crawler belt are continuous from the central portion to the left and right end portions when the vehicle is moving forward. It can be used as a traction force without damaging the soil caught between the lugs by grounding the ground and reducing the vibration.

Further, in the case of claim (5) and claims (7), (8), and (9) in which a crawler belt is provided with a continuous lug, the vehicle has good straightness, and therefore skids even on sloping ground or soft ground. Hard to do.

[Example] An example of a rug pattern of a rubber crawler belt according to the present invention will be described in detail below with reference to the drawings. In addition, in FIG. 1 (a) and FIGS. 3 to 8, the lug top surface is inclined.

FIG. 1 (a) is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (3). This rubber crawler belt has an endless rubber belt 1 and a metal cored bar 2 that meshes with each tooth of a starting wheel.
Are embedded in parallel. As shown in FIG. 2, these core bars 2 are provided with meshing engagement parts 3 at the center in the width direction for engaging with the starting wheels, and guide protrusions 4, rolling rail surfaces 5, and wing parts 6 on the left and right sides thereof, respectively. The rubber belt 1 is installed at right angles to the front-rear direction of the rubber belt 1 at regular intervals. The guide protrusion 4 and the rolling rail surface 5 are engaged with each other by a meshing engagement portion 3,
The blades 6 are offset from each other in the front-rear direction. A large number of steel cords 7 are embedded in the front-rear direction so as to go around the crawler belt in the vicinity of the lower surface of the core metal 2, and a large number of steel or synthetic resin cords 8 are arranged in the vicinity of the upper surface of the wing portion 6 of the core metal 2. Is embedded in the front-back direction so as to go around the crawler track.

A meshing engagement hole 9 with an activation wheel is provided between the adjacent cores in the widthwise central portion of the rubber crawler belt, and the meshing engagement portion 3 provided in the widthwise central portion of the core metal 2 is activated. When meshed with the teeth of the wheel, the meshing engagement holes 9 allow the tooth tips of the starting wheel to escape.

The lug formed on the ground contact surface side of the rubber crawler belt is composed of a center portion 10 in the width direction of the crawler belt, and a branch portion 11 which is distant from the center portion 10 toward the left and right end portions in a diagonally rearward direction,
Each of the branched portions 11 intersects with each other at the central portion 10 and is formed so as to straddle three adjacent metal bar projection planes. Further, in the portion between the adjacent cores, the branch portion 11 of the lug is formed so as to cross at one or more positions on the left and right in the width direction.

As a result, each core metal is evenly supported on the left and right sides by the lugs, and the rolling rail surface 5 is offset in the front-rear direction, so that when the lower rolling wheel rides between the core metals. However, the amount of fall is very small.

The central portion 10 of the lug is provided every other portion with respect to the meshing engagement hole 9. Grooves 12 are formed between adjacent lugs, and when the vehicle travels forward, the lug top surface 13 sequentially touches the ground from the central portion 10 to the branch portion 11, and during this time, the central portion 10 of the next lug touches the ground, On the other hand, it will always be grounded continuously without interruption. Therefore, the intermittent digging into the ground, which has occurred in the case of the conventional one-core one-lug lug, is eliminated, and the track vibration is reduced.

The slope formed at the boundary between the lug top surface 13 and the bottom surface 14 of the groove 12 is a front slope 15 of the lug as shown in FIG. 1 (b).
The angle α formed between the rug top surface 13 and the lug top surface 13 is made larger than the angle β formed between the lag rear slope 16 and the lug top surface 13 to act as a force to push the sheared soil downward and backward.

If the height from the bottom surface 14 of the groove to the top surface 13 of the lugs, the material of the rubber, the shape of the core metal, etc. changes the rubber strain when the track is bent, and there is concern about durability, a preset angle is added in advance. The crawler belt may be formed by molding, or a minimum recess 17 may be provided in a part of the lug top surface 13 as shown in FIG. 1 (C).

FIG. 3 is a partial plan view of a rubber crawler belt having a lug pattern according to claim (4), and the lug has a shape sandwiched between two arcs having a center at the widthwise center of the crawler belt. The two arcs have different center positions and radii, and the front-rear length of each part of the lug top surface is maximum in the center part, and becomes smaller as it goes away from the left and right end parts. At the center of the rubber crawler belt in the width direction, there are meshing engagement holes for releasing the tooth tips when meshing with the starting wheel, and the central portion of the lug is provided between these meshing engagement holes, Grooves are formed between adjacent lugs.

The surface formed at the boundary between the lug top surface and the groove has an angle between the front side surface and the top surface of the lug which is the same as the embodiment of claim (3). It is formed to be larger than the angle formed.

FIG. 4 is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (5). It is a belt-shaped lug in the front-rear direction between the left and right ends of the rubber crawler belt and between the widthwise central portion and the left and right end portions. Is provided. These lugs arranged in four rows in the front-rear direction straddle three cores, and the two rows of lugs on the inner side of the lugs on the left and right ends are offset by one pitch. ing.

FIG. 5 is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (6). The lug has a widthwise central portion of the rubber crawler belt, and a branch portion that is diagonally distant from the central portion toward the left and right end portions. It is composed of. The central portion is provided between meshing engagement holes for releasing tooth tips when meshing with the starting wheel, and the left and right branch portions are arranged to be parallel to each other.

FIG. 6 is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (7), in which the lug has adjacent meshing engagement holes 9,
A central portion 10 provided between 9 and two adjacent central portions 10 and 10 with a meshing engagement hole 9 sandwiched between them, branching away from the left and right ends of the rubber crawler in a diagonally rearward direction. It consists of part 11.

Since the left and right branch portions 11 are arranged so as to be offset from each other by one pitch of the core metal, the left and right portions are asymmetric with respect to the centerline in the width direction of the crawler belt, and the left and right branch portions 11 are adjacent to each other. It is formed so as to cross the core metal projection surface continuously in an obliquely rearward direction. Further, the lug top surface formed in a U shape surrounding the three sides of the engaging hole 9 by the central portion 10 of the lug and the branch portion 11 continuous to the lug has a zigzag shape over the entire circumference of the rubber crawler track. It is continuous.

The length in the front-rear direction of each part of the lug top surface in the branched portion 11 is
It is set to gradually shorten as it goes away from the center of the crawler track toward the left and right ends, and correspondingly, the longitudinal length of each part of the groove 12 formed between the adjacent lug top surfaces is the center of the crawler track. It is set so that it becomes gradually longer as it goes away from the section toward the left and right ends. Also, the slope formed at the boundary between the lug top surface and the bottom surface 14 of the groove provided at a certain depth from the top surface is the front slope 15 of the lug.
In, it is composed of a flat surface with a gradual inclination angle as it goes away from the center toward the end.
The rear slope 16 of the lug is formed of a flat surface having the same inclination angle from the center to the end.

FIG. 7 is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (8), wherein the lug is formed at the center and both ends in the width direction of the rubber crawler belt so as to make a complete circle around the outer circumference of the rubber crawler belt. It is provided. Each of these lugs is in the form of a strip parallel to the front-rear direction, the central lug is wider than the lugs at both ends, and a meshing engagement hole is provided to allow the tooth tip to escape when meshed with the starting wheel.

FIG. 8 is a partial plan view of a rubber crawler belt provided with a lug pattern according to claim (9). The lug is a widthwise central portion of the crawler belt, and a branch branched away from the central portion toward the left and right end portions in a diagonally rearward direction. The central portion is formed in a strip shape parallel to the front-rear direction of the rubber crawler belt so as to circumscribe the outer circumference of the rubber crawler belt without a break. A meshing engagement hole is provided at the center of the lug in the width direction to allow the tooth tips to escape when meshed with the starting wheel. The shape of the branched portion is the same as that of the embodiment of claim (3).

The embodiment of claim (3) shown in FIG. 1, the embodiment of claim (4) shown in FIG. 3, and the claim (7) shown in FIG.
In the embodiment of claim (9) shown in FIG. 8, the shape of the lug is directional with respect to the front-back 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, since the groove of the lug becomes wider toward the left and right ends of the crawler belt, the 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. Slightly inferior, but strong in skidding and excellent in straight running of the vehicle.

[Effects of the Invention] As described above, according to the present invention, it is assumed that the rubber crawler belt is a rubber crawler belt in which a metal cored bar is embedded so that it can mesh with each tooth of the starting wheel. Each of the left and right portions of the cored bar projection surface is provided with one or more lugs, and the lugs are present across a plurality of adjacent cored bar projection surfaces. Since the basic structure is that the lug crosses at one or more locations on both the left and right sides, the degree of freedom in lug shape is dramatically increased compared to the past, and rugs of various shapes corresponding to vehicle operating conditions are formed. You will be able to.

 As a result, the following great effects can be obtained.

(1) The lower rolling wheel drop amount between the cores is reduced,
Vibrations applied to the operator and the ground are significantly reduced.

(2) The rigidity of the crawler belt is increased, and the track is twisted and flaps,
The occurrence of disengagement of the crawler belt is prevented, and the damping force of the bent portion is increased when the crawler belt is bent, so that the collision of the crawler belt with the starter wheel or the idler wheel is mitigated, and the crawler track striking sound is reduced. Further, since the bending strain of the rubber belt is reduced, the rubber crawler belt can be prevented from breaking.

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

(4) Since the frequency of crawler belt slips decreases due to the reduction of crawler belt vibration and the improvement of traction force, the wear of the lug is reduced and the durability of the rubber crawler track is improved.

[Brief description of drawings]

FIG. 1 (a) is a partial plan view of the rubber crawler belt according to the embodiment described in claim (3) as seen from the ground contact side, and FIG. 1 (b) is an X line in FIG.
FIG. 2 (a) is a partial plan view of the rubber crawler belt shown in FIG. 1 (a) as viewed from the rolling contact surface side, FIG. ) Is a sectional view taken along the line A-A in FIG. 2 (a), and FIGS. 3 to 8 are lug pattern explanatory views of the rubber crawler belt according to the embodiment as seen from the ground contact side, and FIG. An embodiment described in (4), FIG. 4 is an embodiment described in claim (5), FIG. 5 is an embodiment described in claim (6), and FIG. 6 is an embodiment described in claim (7), FIG. 7 shows an embodiment described in claim (8), and FIG. 8 shows an embodiment described in claim (9). 1 …… Rubber belt 2 …… Core metal 9 …… Mating engagement hole 10 …… Center part 11 …… Branching part 12 …… Groove

Claims (8)

(57) [Claims] 1. An endless rubber belt wound around a running portion, in which a metal cored bar that meshes with each tooth of a starting wheel is embedded, and a rug pattern of a rubber crawler belt having a lug on the ground contact side, the outer periphery of the crawler belt is It goes around without a break and has a predetermined width in the widthwise central part of the crawler belt, and a diagonally rear part with a predetermined width from the left and right ends of the central part and at a predetermined distance. A rubber crawler track rug pattern characterized by consisting of diverging parts that move away from each other. 2. The rug pattern of a rubber crawler track according to claim 1, wherein the positions of the ends of the crawler belts at the left and right branch portions on the side of the central portion are the same in the front and rear direction of the crawler belt. 3. A rug pattern for a rubber crawler belt according to claim 1, wherein the left and right branch portions are arranged so as to be offset by one pitch in the front and rear direction of the crawler belt. 4. The rug pattern of a rubber crawler track according to claim 1, wherein the branching portion is provided so as to straddle three adjacent core metal projection surfaces. 5. A rug pattern of a rubber crawler belt having an endless rubber belt wound around a running portion, in which a metal cored bar that meshes with each tooth of a starting wheel is embedded, and which has a lug on the ground contact surface side, the lug pattern has a width. Direction V shape whose center part is higher than both end parts in the direction, and which are arranged with a predetermined width and at a predetermined distance over the entire circumference of the crawler belt, and straddle three adjacent core metal projection surfaces Rubber track rug pattern featuring. 6. A rug pattern of a rubber crawler belt, in which a metal cored bar meshing with each tooth of a moving wheel is embedded in an endless rubber belt wound around a running portion, and the lug pattern is a rubber crawler track having a lug on the ground contact side. A rug pattern for a rubber crawler track, characterized in that the lugs are provided at the center and both ends in the width direction of the rubber crawler so that the outer circumference of the rubber crawler circles without interruption, and that all of these lugs are belt-shaped parallel to the front-rear direction. 7. An endless rubber belt wound around a running portion is embedded with a metal cored bar that meshes with each tooth of a starting wheel, and in a rug pattern of a rubber crawler belt having a lug on the ground contact side, the belt-shaped lug is made of rubber. The crawler belts are separated from each other in the front-rear direction and provided on both left and right sides, and between the center portion and the left and right end portions in the width direction. These lugs are straddled by three adjacent metal bar projection surfaces, and the inner lugs are A rubber crawler rug pattern, which is installed by shifting the core lug one pitch from the outside lug in the longitudinal direction of the crawler track. 8. A lug pattern of a rubber crawler belt, in which a metal cored bar meshing with each tooth of a starting wheel is embedded in an endless rubber belt wound around a running portion, and the lug pattern is a rubber crawler track having a lug on the ground contact side. It consists of a widthwise central part and a branch part that is distant from the center part toward the left and right ends, and the left and right branch parts are parallel to each other, and the left branch part and the right branch part are adjacent to each other. A rubber crawler rug pattern characterized by straddling three core metal projection planes.