JPH08301155A - Core for elastic crawler - Google Patents

Abstract

PURPOSE: To secure the function to prevent wheels from coming off, to smoothen the movement of the outer peripheries of drive wheels, etc., along a curve, and to prevent cracking of a crawler main body. CONSTITUTION: This core 1 for an elastic crawler has a pair of right and left wings 2A, 2B embedded in toward the outside of the width of a crawler main body; a drive wheel engaging part 3 connecting the wings 2A, 2B together; and a pair of right and left guide projections 4A, 4B provided to sandwich the engaging part 3. Protrusive engaging parts 5A (projection), 5B (recess) tar regulating relative movements in the longitudinal (horizontal) direction of the core and for regulating vertical movement during travel on a straight line are placed respectively at the upper portions of both ends of the guide projections 4A, 4B along the cross direction of the core, and are kept out of contact with each other when traveling along a curve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to agricultural machinery, construction machinery,
The present invention relates to a core bar of an elastic crawler used as a running part of a civil engineering work machine or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 5 to 7, an elastic crawler 10 has a plurality of steel cords extending in the width direction as expansion preventing members in a crawler main body 11 made of an elastic material such as rubber. 12 are arranged and embedded in the circumferential direction, and in order to transmit the driving force transmitted from the drive wheel (sprocket wheel) 13 to the steel cord 12, an interval (corresponding to the pitch of the sprocket tooth portions 14 in the circumferential direction of the crawler main body 11 is transmitted. The cored bar 15 is buried under the condition.

As shown in FIG. 5, the crawler 10 is mounted on a traveling device mounted on a backhoe or another work vehicle, and a driving wheel 13 provided at one end of a crawler frame 16 and the other end thereof. It is wound around a free wheel 17 provided on the side and a guide roller 18 provided for crawler guide between both wheels 13, 17. The core metal 15
Is a pair of left and right wing portions 19 that are embedded outward in the width direction of the crawler body 11, and a drive wheel engaging portion that connects the wing portions 19, that is, an engaging portion 20 of the sprocket tooth portion 14, It is provided with a pair of left and right guide protrusions 21 that are provided so as to project on the inner peripheral surface side with the engaging portion 20 interposed therebetween.

Both ends of the guide projection 21 are spaced at regular intervals in the circumferential direction of the crawler body 11. However, when a work vehicle or the like rides on an obstacle such as a stone while traveling, the left and right sides of the crawler body 11 are prevented. When a force in the (width) direction is applied and a large elastic deformation occurs, as shown in FIG. 8, the center between the guide protrusions 21 is largely deviated laterally from the center C of the drive wheel 13 and the idler wheel 17. Become.

Therefore, when the work vehicle or the like travels with the guide projection 21 displaced in this way, there is a problem that the drive wheel 13 comes off from the guide projection 21 and comes off. Conventionally, in order to prevent the drive wheels 13 from coming off, as shown in FIGS. 6 and 7, the crawler main body 11 is provided at both ends in the width direction of the blade portion 19 of the cored bar 15 (front and rear in the circumferential direction of the crawler main body 11). Protrusions 22 and 23 having a shift in the width direction are formed so that the guide protrusions 21 and 21 of the adjacent cored bar 15 are brought close to each other so that the cored bar 15 does not shift in the width direction of the crawler body 11. Has been proposed (for example, see Japanese Utility Model Laid-Open No. 6-1154).

Further, there has been proposed one in which the tips of the horizontal projections provided on the adjoining and facing surfaces of the cored bar 15 embedded in the crawler main body 11 are fitted together (actual flat plate 5-).
92077).

[0007]

By the way, in the former case of the above-mentioned prior art, when the vehicle rides on an obstacle such as a stone while traveling on a rough road, the force in the lateral direction, that is, only in the width direction of the crawler body 11 is increased. When applied, lateral displacement can be prevented, but when vertical and circumferential forces of the crawler body 11 are applied, the spacing between the blade portions 19 of the cored bar 15 increases,
There is a problem that the lateral deviation prevention function of the projections 22 and 23 cannot be exerted.

Further, the latter of the above-mentioned prior arts has a function of preventing wheel derailment, but lacks smoothness in the movement of the outer periphery of the drive wheel, causing cracks in the rubber layer and impairing the durability of the crawler body. There's a problem. The present invention has been made in view of the above situation, and an object thereof is to ensure a derailment prevention function, and also to smoothly bend the outer periphery of a drive wheel or the like to prevent cracks in the crawler body. An object is to provide a core bar for an elastic crawler that can prevent the occurrence of the metal and improve the durability.

[0009]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, a pair of left and right wing portions that are embedded outward in the width direction of the crawler body, a drive wheel engaging portion that connects the wing portions, and a projecting portion sandwiching the engaging portion are provided. In a core bar for an elastic crawler including a pair of left and right guide protrusions, the guide protrusions are provided on the upper ends of the core bar width direction to prevent mutual movement in the lengthwise (left and right) direction of the core bar, and when the linear portion is running. It is characterized in that projection engaging portions for restricting the movement in the vertical direction are provided respectively.

Further, the present invention is characterized in that the projection engaging portion is composed of one projection and the other upper open recess into which the projection is fitted and engaged. Furthermore, the present invention is characterized in that the mutual contact in the vertical direction of the projection engaging portion is a point or line contact.

[0011]

According to the present invention, since the projection engaging portions provided on the guide projections of the adjacent cores embedded in the crawler body are engaged with each other, the upper, lower, left and right ( Mutual movements in the lateral direction and the circumferential direction are restricted, and it is possible to prevent deviation when riding on an obstacle such as a stone while traveling on a bad road, and thus to prevent the crawler from derailing.

Further, since the upper portion of the concave portion forming the projection engaging portion is open, the projection engaging portions do not interfere with each other when the outer periphery of the drive wheel and the idler wheel is moved, so that the crawler can smoothly travel. it can. Further, by making the mutual contact in the vertical direction of the projection engaging portion a point or line contact, the load when the guide roller rides is dispersed to the guide projections of the adjacent cored bar, and the sinking amount of the cored bar is reduced. Thus, the crawler can smoothly run, and the crawler can smoothly run because the drive wheels and the idler wheels do not contact each other in the bending direction when moving around the outer peripheral portions.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes a core bar for an elastic crawler, which is a pair of left and right wing portions 2A and 2B that are embedded outward in the width direction of the crawler body (see FIGS. 6 and 7), and the wing portions 2A and 2B. It is composed of a drive wheel engaging portion 3 (specifically, an engaging portion of a sprocket tooth portion) that connects the two, and a pair of left and right guide protrusions 4A and 4B that are provided so as to sandwich the engaging portion 3. , The protrusions 4A, 4
In B, projection engaging portions 5A and 5B are provided on both upper ends of the front-rear direction (circumferential direction of the crawler body).

The widths W of the wings 2A and 2B are substantially the same from the guide projections 4A and 4B to both left and right (longitudinal) ends, and the width direction edges are parallel, and the thickness (upper and lower) is increased. (Thickness in the direction) is reduced toward both tips. The guide protrusions 4A and 4B are provided on the inner peripheral side of the crawler body, and the upper end surface thereof is a flat tread surface with which the guide roller (see FIG. 5) makes rolling contact. Then, the guide protrusion 4
The protrusion amounts of A and 4B in the front-rear direction are the same, and the protrusion engaging portions 5A and the protrusion engaging portions 5B are alternately provided on the left and right sides.

The projection engaging portion 5A is provided with guide projections 4A, 4
B is a protrusion projecting forward and backward from the front and rear end faces of B, and the other protrusion engaging portion 5B is a recess of the upper opening which is recessed in the front and rear end faces of the guide protrusions 4A, 4B. The engaging portion 5A is adapted to be fitted and engaged. And
The upper end surface of the projection engaging portion 5A is a flat surface that is flush with the tread surface, but the lower surface has an inclined surface 6 that faces upward toward the tip.
It is said that the width becomes narrower toward the tip. Further, the other protrusion engaging portion 5B has a U shape in a front view as shown in FIG. 2, and the protrusion engaging portion 5B is provided at the lower end edge 7 of the circumferential opening thereof.
The angle of the inclined surface 6 of A makes point contact only during direct traveling (when the crawler is in contact with the ground), and the load of the work vehicle (force in the vertical direction = gravity) is applied to the adjacent core metal 1 and the engaging portions 5A and 5B are applied. It is designed to be dispersed through.

In the above embodiment, when the crawler is traveling normally and traveling straight, only the adjacent protrusion engaging portions 5A and 5B are in point contact with each other. When riding on an obstacle, a vertical, circumferential, and lateral force is applied to the crawler, causing the crawler body to undergo large elastic deformation and attempting to shift, but the adjacent core metal 1 does not move to the protrusion engaging portions 5A and 5B. Movements in the vertical and circumferential directions are mutually regulated by point contact, and lateral (horizontal) movements are also mutually regulated by the opposing side surfaces of the projection engaging portions 5A, 5B, so that the guide projections 4A, 4B move vertically. The crawler is prevented from slipping off without being displaced in the front-rear direction and the lateral direction.

Further, when the vehicle travels in a curved manner, that is, when the vehicle travels on the outer peripheral portion of the drive shaft and the idler wheel, both the projection engaging portions 5A, 5B.
Is in a non-contact state, and each cored bar 1 is not restrained by the projection engaging portions 5A and 5B of the adjacent cored bar 1, so that the curved running becomes smooth. Further, since the projection engagement portions 5A and 5B engage with each other outside the crawler body, cracks and peeling do not occur in the crawler body, and durability can be improved.

The present invention is not limited to the above-described embodiment. For example, the contact between the protrusion engaging portions 5A and 5B is controlled by the inclined surface 6 of the protrusion engaging portion 5A and the lower opening of the other engaging portion 5B. The edge 7 can be in line contact, and the design can be changed appropriately.

[0019]

As described above, according to the present invention, a pair of left and right wing portions are embedded outward in the width direction of the crawler body,
A core bar for an elastic crawler, comprising a drive wheel engaging part for connecting the wing parts, and a pair of left and right guide protrusions protruding with the engaging part sandwiched therebetween. The crawler is characterized in that projection engaging portions for restricting mutual movement in the longitudinal (horizontal) direction of the core metal and restricting vertical movement during traveling of a straight portion are provided on the upper ends of both ends of the core bar. Prevents crawler wheel derailment by preventing vertical displacement, vertical movement and lateral (horizontal) displacement of the metal core when riding on an obstacle such as a stone while driving, and prevents cracking and peeling of the crawler body for durability. It is possible to improve the sex.

Further, the present invention is characterized in that the projection engaging portion is composed of one protrusion and the other upper open recess into which the protrusion is fitted and engaged. Therefore, the crawler curve is curved. Secure the non-contact state of the projection engagement part during running,
It is possible to realize smooth running. Further, the present invention is characterized in that the vertical contact between the projection engaging portions is a point or line contact, so that it is easy to design the switching point between the mutual contact and non-contact states.

[Brief description of drawings]

FIG. 1 is a plan view of an engaged state showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a right side view of FIG.

4 is a right side view of FIG. 1 with a part thereof broken away.

FIG. 5 is a side view showing a general example of a crawler traveling device.

FIG. 6 is a plan view showing a conventional example of an elastic crawler.

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is an explanatory diagram of a displaced state when a lateral force is applied to a conventional rubber crawler.

[Explanation of symbols]

 1 core metal 2A blade part 2B blade part 3 drive wheel engagement part 4A guide protrusion 4B guide protrusion 5A protrusion engagement part (projection part) 5B protrusion engagement part (recessed part)

Claims (3)

[Claims] 1. A pair of left and right blades embedded outward in the width direction of the crawler main body, a drive wheel engagement portion connecting the blades, and a projecting portion sandwiching the engagement portion. In a core bar for an elastic crawler having a pair of left and right guide protrusions, the guide protrusions have upper and lower ends in the width direction of the core bar that restrict mutual movement in the longitudinal (left and right) direction of the core bar and vertically move when traveling on a straight portion. A core bar for an elastic crawler, characterized in that projection engaging portions for restricting movement in a direction are respectively arranged. 2. The mandrel for an elastic crawler according to claim 1, wherein the protrusion engaging portion includes one protrusion and the other open upper recess into which the protrusion is fitted and engaged. 3. The core bar for an elastic crawler according to claim 1, wherein mutual contact in the vertical direction of the protrusion engaging portions is point or line contact.