JP2528017B2 - Rubber track of tracked vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rubber crawler belt wound around a tracked vehicle such as a construction machine such as a bulldozer or a hydraulic excavator.

[Prior Art] Conventionally, in tracked vehicles such as 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 track is generally used for the starter wheel with an odd number of teeth.
It meshes with a tooth jump. 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 the rubber crawler belt. In addition, as shown in FIG. 5, when the crawler belt is wound around the starter wheel and the idler wheel and the bending angle θ of the crawler belt is large, the lug groove provided on the ground contact side is The strain increases and cracks easily occur,
Reduces track durability.

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 mandrel and the rubber in the driving force transmission path to the steel cord embedded in the lower side of the mandrel, 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. I can't get it. Therefore, there are the following problems.

(1) Since the lugs are independently provided for each core metal, the lower wheels fall between the core metal and the core metal as shown in FIG. 6 during traveling, and the vehicle body vibrates.

(2) Since the lugs are provided independently for each core metal, the lugs bite into the ground intermittently, increasing the vibration force of the track.

(3) 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 rattling of the crawler track are reduced. Likely to happen.

(4) Since the groove area is small, the amount of soil to be captured is small, and the captured soil is destroyed by vibration, so it is difficult to transmit the driving force to the ground. Therefore, the traction force is reduced.

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 wheel rides between the cored bars, there is a problem that it falls to the discontinuous portion side of the lug.

It is an object of the present invention to provide a rubber crawler track for a tracked vehicle in which most of the conventional problems described above are caused by the vibration of the rubber crawler track, and the vibration during traveling is reduced.

[Means for Solving the Problems] In order to achieve the above object, a rubber crawler track of a tracked vehicle according to the present invention is an endless rubber belt wound around a running portion,
A rubber crawler belt of a tracked vehicle in which metal cores meshing with each other of a starter wheel are embedded in parallel, and the longitudinal lengths of the left and right wing portions of the core metal are provided in a central portion in a width direction of the core metal. The length of the meshing engagement part with the starting wheel is almost the same as the length in the front-rear direction, and many core wires are embedded along the front-rear direction of the crawler track in the vicinity of the lower surface of the core metal and the upper surfaces of the left and right wing parts. Each of the lugs provided on the right and left sides of the core metal projection surface is provided at one or more places, and the lugs are provided so as to straddle a plurality of adjacent core metal projection surfaces to reduce vibration during vehicle traveling.

[Operation] According to the above configuration, the lugs provided on the ground contact surface side are provided at one or more locations on the right and left portions of each core bar projection surface, and the lugs are provided over a plurality of adjacent core bar projection surfaces. , The lower wheel supporting force between the cores increases on both the left and right sides. In addition, since the pitch of the cored bars is made smaller to mesh with each tooth of the starting wheel, both the longitudinal length of the cored bar and the interval between the cored bars are reduced, and the amount of inclination of the cored bar when passing through the lower rolling wheel is reduced. . Further, since the core wire is embedded above and below the core metal, the adhesive strength between the rubber belt and the core metal can be increased, and the amount of inclination of the core metal when the lower roller passes between the core metals can be suppressed to be small. As a result, when the vehicle is running, the amount of lower rolling wheels falling between the cores is reduced, and vibration is drastically reduced.

Further, the straddling of the lugs increases the rigidity of the crawler belt, and the vibration damping force of the bending portion becomes large when the crawler belt is bent, so that the collision of the crawler belt with the starter wheel or the idler wheel is alleviated.

[Embodiment] An embodiment of the rubber track of the tracked vehicle according to the present invention will be described in detail below with reference to the drawings.

1 (a) is a partial plan view of the rubber crawler belt viewed from the rolling surface side of the rolling wheels, FIG. 1 (b) is a sectional view taken along line CC of FIG. 1 (a), and FIG. 2 (a) is a rubber crawler belt. It is a partial plan view seen from the ground contact surface side, and FIG. Fig. 2 (a)
In, the lug top surface is shaded.

This rubber crawler belt is made by embedding a metal cored bar 2 that meshes with each tooth of an activation wheel in an endless rubber belt 1 at right angles to the front-rear direction of the rubber belt 1 at regular intervals. As shown in FIG. 1 (a), these core bars 2 are provided with a substantially semicircular meshing engagement portion 3 having a length A in the front-rear direction shorter than the tooth gap of the starting wheel in the widthwise central portion. The guide protrusions 4 provided at both ends of the meshing engagement portion 3 guide the rubber crawler belt so as not to come off from the rolling surface of each rolling wheel. Guide protrusion 4
As shown in Fig. 2 (b), the top surface of is formed with an arc equal to or slightly smaller than the rolling radius R of the idler wheel, and is in surface contact with the outer periphery of the idler wheel or in line contact at two points. It is like this.

Rolling rail surfaces 5 of the lower rolling wheels are provided from the lower end of the guide protrusion 4 to the left and right outer sides, respectively.
Are provided on the left and right.

The front-rear length B of the wing portion 6 is shorter than the tooth gap of the starting wheel, and the relation between the front-rear length A of the meshing engagement portion 3 and the front-rear length B of the wing portion 6 is A ≦ B. , And the lengths of both are almost similar.

The guide protrusion 4 and the rolling rail surface 5 are offset from each other in the front-rear direction with respect to the meshing engagement portion 3 and the blade portion 6. A large number of steel core wires 7 are embedded along 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 core wires are provided in the vicinity of the upper surface of the wing portion 6. 8 are buried along the front-rear direction so as to go around the crawler belt.

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 includes a central portion 10 provided between the adjacent meshing engagement holes 9 and two adjacent central portions 10 sandwiching the meshing engagement hole 9. It is composed of 10 branching portions which are continuous with each other and which are distant from each other toward the left and right ends of the rubber track in a diagonally rearward direction.

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 branch portions 11 are asymmetric with respect to the widthwise center line of the crawler belt, and the left and right branch portions 11 are adjacent to each other. Is formed so as to continuously traverse the core metal projection surface in the obliquely rearward direction. Further, a lug top surface 12 formed in a U-shape surrounding three sides of the engaging hole 9 by a central portion 10 of the lug and a branch portion 11 continuing from the central portion 10 has a zigzag shape over the entire circumference of the rubber crawler track. In succession.

The length in the front-rear direction of each part of the lug top surface 12 in the branch portion 11 is set so as to become gradually shorter as it goes away from the center part of the crawler belt toward the left and right end parts, and correspondingly,
The longitudinal lengths of the respective portions of the groove 13 formed between the adjacent lug top surfaces 12 are set to gradually increase as the distance from the center portion of the crawler belt increases toward the left and right end portions. In addition, the slope formed at the boundary between the lug top surface 12 and the groove bottom surface 14 provided at a constant depth from the top surface gradually increases in the front slope 15 of the lug as it moves away from the center toward the end. The lug has a flat surface with a gentle inclination angle, and the rear slope 16 of the lug has a flat surface with the same inclination angle from the center to the end.

When a tracked vehicle in which such rubber crawler belts are wound runs, since the lugs provided on the ground contact surface side of the rubber crawler belts are straddled over a plurality of adjacent core metal projection surfaces, The lower wheel supporting force is remarkably increased as compared with the conventional one-core one-lug rubber crawler track. In addition, since the pitch of the cored bars is made smaller to mesh with each tooth of the starting wheel, both the longitudinal length of the cored bar and the interval between the cored bars are reduced, and the amount of inclination of the cored bar when passing through the lower rolling wheel is reduced. . Furthermore, since the core wires are embedded above and below the core metal, the amount of inclination of the core metal when the lower roller passes between the core metals can be suppressed to a small amount. As a result of these, the rigidity of the crawler belt is increased and the left and right rolling rail surfaces of the cored bar are offset from each other in the front-rear direction. As shown in FIG. 3, it becomes smaller and the vibration is drastically reduced.

Further, the straddling of the lugs increases the rigidity of the crawler belt, prevents the crawler belt from twisting and coming off, and the bending strain is dispersed on the groove slope when the crawler belt is bent, and is not concentrated on the bent portion. Further, since the crawler belt bending angle when wrapped around the starter wheel or idler wheel is approximately θ / 2 as shown in FIG. 4, the collision of the tracker with the starter wheel or idler wheel is mitigated, and the track hitting sound is reduced. .

Since the top surface of the guide protruding portion of the core metal is in close contact with the tread surface of the idler wheel, flapping of the crawler belt generated between the starting wheel and the idler wheel is suppressed.

In this embodiment, an example of the lug provided on the ground contact surface side of the rubber crawler belt is shown, but the present invention is not limited to this, and other lug patterns falling within the scope of the claims may be used.

[Effects of the Invention] As described above, according to the present invention, the left and right wings of the core metal are premised on a rubber crawler belt in which a metal core metal is embedded so that each tooth of the starting wheel can be engaged. The length of the part in the front-rear direction is almost the same as the length in the front-rear direction of the engagement part with the starter wheel, and many core wires are embedded near the upper and lower surfaces of the cored bar, and the lugs provided on the grounding surface side are adjacent to each other. Since it is provided over a plurality of core metal projection surfaces, the following effects can be obtained.

(1) The lower rolling wheel supporting force between the cores is significantly increased as compared with the conventional rubber crawler belt with one core and one lug. Also one of the starting wheels
Since the pitch of the cored bar is reduced to engage with each tooth, both the length of the cored bar in the front-rear direction and the interval between the cored bars are reduced, and the amount of inclination of the cored bar when passing through the lower wheel is reduced. Further, since the core wire is embedded above and below the core metal, the adhesive strength between the rubber belt and the core metal can be increased, and the amount of inclination of the core metal when the lower roller passes between the core metals can be suppressed to be small. As a result of these, the rigidity of the crawler belt is increased and the left and right rolling rail surfaces of the cored bar are offset from each other in the front-rear direction. It becomes smaller and the vibration applied to the ground and the driver is drastically reduced.

Further, the zigzag continuous lug formed in the widthwise central portion of the crawler belt continuously digs into the ground as the vehicle travels, and thus suppresses the vibration generated in the case of an intermittent lug.

(2) When the vibration applied to the ground is small, the driving force can be effectively transmitted to the ground without destroying the soil captured by the rasp groove. As a result, a high traction force can be obtained.

(3) Since the vibration is small and the traction force is high, the frequency of crawler belt slip is reduced and the wear of the lug can be reduced.

(4) The increased rigidity of the crawler belt prevents the crawler belt from twisting and coming off, and the bending strain is dispersed to the groove slope when the crawler belt is bent, and the vibration damping force of the bent portion becomes large, so that the starter wheel and the idle wheel are not moved. Collision of the track with respect to the ring is alleviated, and the track hitting sound is reduced.

(5) Since the top surface of the guide protruding portion of the cored bar is formed with an arc equal to or slightly smaller than the rolling radius R of the idler wheel, the top of the guide protruding portion 4 when the crawler belt is wound around the idler wheel. The surface is in close contact with the tread surface of the idler wheel, and suppresses the flapping of the crawler belt generated between the starting wheel and the idler wheel.

[Brief description of drawings]

FIG. 1 (a) is a partial plan view of the rubber crawler belt according to the embodiment seen from the rolling surface side of the rolling wheels, and FIG. 1 (b) is C- in FIG. 1 (a).
C sectional view, FIG. 2 (a) is a partial plan view of the rubber crawler belt shown in FIG. 1 viewed from the ground contact side, (b) is a partial side view of the same, and FIG. 3 is a core of the rubber crawler belt according to the present invention. FIG. 4 is an explanatory view showing a state in which a lower wheel is placed between the metal, FIG. 4 is a partial side view showing a meshing state between the rubber crawler belt according to the present invention and the starting wheel, and FIG. FIG. 6 is a partial side view showing a meshed state of a conventional rubber crawler belt, and FIG. 6 is an explanatory view showing a state in which a lower wheel is dropped between cores in the conventional rubber crawler belt. 1 …… Rubber belt 2 …… Core metal 3 …… Intermeshing engagement part 6 …… Wing part 7,8 …… Core wire

Claims (1)

(57) [Claims] 1. An endless rubber belt 1 mounted on a running portion.
The metal cored bar 2 having the rolling rail surface 5 of the rolling wheel and meshing with the starter wheel for each tooth is embedded in parallel in the strip direction, and the center of the width direction and the interlocking of the cored bar 2 with the starter wheel. In a rubber crawler track of a tracked vehicle provided with a non-engagement portion 3, the core metal 2 is provided with protrusions 4 on both left and right sides of the engagement portion 3 at positions displaced from each other in the front-rear direction, and a lug is provided on the ground contact surface side. The lug circulates the outer circumference of the crawler belt without a break, and has a central portion 10 having a predetermined width in the widthwise central portion of the crawler belt, and a predetermined width and a predetermined distance from the left and right of the central portion. A rubber crawler track for a tracked vehicle, which is composed of a branch portion 11 that is diagonally distant from each other in the rearward direction, and straddles the projection planes of three adjacent cored bars 2.