JP2003118658A - Elastic track plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a junction structure covering a core bar by an elastic body in a longitudinal end part of the core bar and an elastic pad, alleviate local stress concentration to the elastic pad in the end part, and enhance durability and damage prevention of a curbstone or the like due to contact. SOLUTION: The elastic track plate 10 is attached to a ground contacting face side in a steel shoe plate 2 of a crawler belt 1. The elastic track plate 10 is formed so as to protrude more than a longitudinal end of the shoe plate 2, and its protruding tip is covered by the elastic body and integrally formed with the elastic pad 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic track plate used in a tracked vehicle, and more specifically, it is attached to an iron shoe plate so that a side end portion of the track plate comes into contact with a curb or the like of a road during traveling. The present invention relates to an elastic crawler plate that functions so as not to be damaged.

[0002]

2. Description of the Related Art Conventionally, track-type construction machine vehicles such as hydraulic excavators and bulldozers are often used in which a large number of iron shoe plates are connected in an annular shape. Since the road surface is significantly damaged when the vehicle runs over, an elastic shoe plate having an elastic body such as rubber is detachably attached to the ground surface of the iron shoe plate.

As the prior art relating to this kind of elastic shoe plate, for example, the one disclosed in Japanese Utility Model Registration No. 2595443 is known. The elastic crawler plate 55 described in this publication is shown in FIG. 7 with a plan view (a), a side view (A) taken along the line AA and a sectional view (c) taken along the line BB in FIG. ), A metal plate 51 (core bar) formed by projecting a plurality of mounting screw parts to be mounted on the iron shoe plate 50 on the mounting surface side at predetermined positions on both ends in the length direction. To
On the surface side of the metal plate 51, the lugs 50a of the iron shoe plate 50,
A member 54 (elastic body pad) made of an elastic body having a height higher than that of 50b is integrally bonded and configured. In this elastic crawler plate 55, an elastic pad bonded to the metal plate 51 is attached within the entire length of the metal plate 51. Also, the mounting screw portion for the iron track plate 50 is the mounting bolt 5
The head portion 53a of No. 3 is welded and fixed to the metal plate 51 so as to project to the back surface side thereof.

[0004]

In the elastic crawler plate 55 according to the prior art, the adhesive interface is exposed at the end of the elastic pad 54 attached to the metal plate 51 (core bar) in the longitudinal direction. Therefore, there is a problem that the elastic body portion is easily peeled off when an external force acts on the outermost end portion. In addition, since the core metal 51 of the elastic track plate 55 mounted on the iron track plate 50 is located up to the side end of the crawler belt, if it comes in contact with a curb or the like while traveling along the road edge during work, It will damage the curbs.

Further, a bolt 53 forming a mounting screw portion for mounting the elastic crawler plate 55 to the iron crawler plate 50.
Head 53a is made of elastic pad 54 and core metal (metal plate 51)
When it is used by being attached to the crawler belt, the rubber material (elastic material) forming the elastic pad 54 tends to cause strain concentration, resulting in the life of the elastic material. There is also a problem that is shortened.

The present invention has been made in order to solve such a problem, and has a structure in which the longitudinal direction ends of the cored bar and the elastic pad cover the cored bar with an elastic body, and the ends of the cored bar and the elastic body pad are covered. It is an object of the present invention to provide an elastic shoe plate in which local stress concentration on the elastic pad is relieved and damage to a curb or the like due to contact can be prevented and durability can be improved.

[0007]

In order to achieve the above-mentioned object, an elastic crawler plate according to the present invention is an elastic crawler plate mounted on the ground contact surface side of an iron shoe plate of a crawler belt. The elastic crawler plate is formed so as to project beyond the longitudinal end of the shoe plate (first invention).

According to the present invention, when the elastic shoe plate is mounted on the iron shoe plate, the elastic shoe plate overbangs outward from the iron shoe plate, so that it is laid on the road shoulder, for example. Even if you ride on a curb, etc., it is buffered by the elastic pad of the elastic track plate and does not directly contact the iron shoe plate as in the past, so it is possible to prevent the curb from being damaged. The effect is that it can be prevented.

The elastic crawler plate is provided with an elastic body forming portion projecting from a longitudinal end of the shoe plate (second invention). In this way, even if the crawler or the like on the road shoulder contacts the crawler during traveling, the metal portion does not directly contact the curb or the like, so that the curb or the like is not damaged. Also, since the core plate of the elastic crawler plate is covered with the elastic body at the outer end thereof, the elastic pad portion is not separated from the adhesive interface by the external force, and the durability can be improved. It has an effect.

It is preferable that at least one end portion in the longitudinal direction of the core metal of the elastic crawler plate in the second invention is bent obliquely upward in the direction opposite to the ground contact surface (third invention). Further, it is preferable that the bent portion of the cored bar is configured such that the tip of the bent portion projects outward from the side end portion of the shoe plate (fourth invention). By doing so, even if a large external force is applied to the end of the elastic shoe attached to the shoe plate, the load applied to the elastic body that covers the end is received by the bent portion of the core metal, and the elasticity is reduced. Since stress concentration does not occur in the body, durability can be obtained without cracks in the elastic body. In addition, if the tip of the core bar projects outside the shoe plate, even if a large load is applied to the end of the elastic crawler plate, the elastic part can be reinforced to prevent damage. You can

Further, it is preferable that both end portions in the longitudinal direction of the cored bar be covered with an elastic body (fifth invention). By doing so, the elastic shoe plate attached to the iron shoe plate has the end portion protruding outward from the side end of the shoe plate covered with the elastic body, so that the Even if the curb of the road is rubbed, the curb is not damaged, and the peeling durability can be significantly improved by increasing the adhesive area of the elastic body to the core metal and by not exposing the adhesive interface, That is the effect.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific embodiments of the elastic shoe plate according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view of the elastic shoe plate according to the present invention mounted on an iron shoe plate of a crawler belt. Further, FIG. 2 shows a front view (a), a bottom view (b) and a-a in FIG. 2 (a) of the elastic shoe plate of the present embodiment.
A cross-sectional view (c) is shown.

In the elastic crawler plate 10 of this embodiment, as shown in FIG. 1, the outer shape of the cored bar 11 is formed in the recess formed on the ground contact surface side of the iron shoe plate 2 which constitutes the crawler belt. An elastic body pad 17 having a trapezoidal cross section is adhered to the grounding surface side of the cored bar 11 so as to be integrated with the mounting hole 4 provided in the shoe plate 2. At the matching position, the mounting bolt 8 is screwed into the screw hole 12 formed in the core metal 11 to be fastened and mounted.

The iron shoe plate 2 on which the elastic shoe plate 10 is mounted has a recess 3 formed on the ground contact surface side thereof.
Are formed in two places at a predetermined pitch in the front-rear direction in a state in which they are connected as a crawler belt, and three grousers are formed conveniently in front of and behind the recesses at the two places (not shown). The elastic crawler plate 10 is attached so as to cross the grouser.

The core metal 11 of the elastic track plate 10 is
To the shoe plate 2 having a length L corresponding to the dimension of the shoe plate 2 in the widthwise direction and having a stepped portion 14 having an upper surface which fits into a recess of the shoe plate 2 and which receives the end faces of the grouser in the front and rear direction. The mounting portion 11a is formed,
Screw holes 12 that match the mounting holes 4 formed in the shoe plate 2 are provided at positions that are appropriately inwardly dimensioned from both ends in the length direction of the mounting portion 11a. Also,
On the upper surface of the intermediate portion of the mounting portion 11a of the cored bar 11, there is formed a concave portion 13 for intersecting the head portion 7 of the mounting bolt for fastening the shoe plate 2 to the link 6 for forming the crawler belt, and an intermediate position in the intermediate portion in the width direction. Grooves 14a that intersect the grousers are formed. Further, at both ends in the longitudinal direction of the mounting portion 11a of the cored bar 11, there are integrally formed with the mounting portion 11a a reinforcing portion 15 whose front end portion is bent obliquely upward and an inclined surface is formed on the grounding surface side. There is. As shown in FIG. 2B, the reinforcing portion 15 is provided with a slope that narrows from both sides in the width direction toward the tip.

The elastic pad 17 is made of a rubber material and has a trapezoidal cross section, and is provided with a recess 17 'in the middle portion on the grounding surface side. The elastic pad 17 is bonded to the grounding surface side of the cored bar 11 and the length of the cored bar 11 is increased. The reinforcing portions 15, 15 at both ends in the direction are entirely covered to be molded into a required length L'and integrated with the cored bar 11. Both ends 17a in the longitudinal direction completely cover the reinforcing portion 15 of the cored bar 11 and are formed to have a predetermined width B with a rubber material longer than the end of the reinforcing portion 15 and have a rounded corner portion. The shape is attached.

In the elastic crawler plate 10 thus constructed, the upper surface of the mounting portion 11a of the cored bar 11 is fitted into the concave portion of the shoe plate 2 made of iron, and the rear surface side of the shoe plate 2 is fitted into the screw holes 12 at both ends. Then, the mounting bolt 8 is inserted through the mounting hole 4 and screwed to be fastened and fixed. In this way, the elastic shoe plate 10 is stably mounted on the ground surface side of one shoe plate 2. In this state, the elastic crawler plate 10 of the present embodiment is
As shown in FIG. 1, the shoe plate 2 is mounted with its end protruding from the side end. In this elastic crawler plate 10, the ratio of the longitudinal dimension L'of the elastic crawler plate 10 of the present embodiment to the longitudinal dimension L of the iron shoe plate 2 is 1.2 to L '/ L. A value of 1.6 is practically preferable.

In the crawler belt having the elastic crawler plate 10 constructed as described above, a part of the elastic crawler plate 10 protrudes from the iron shoe plate 2 to the outside. Even if the crawler belt rides on or comes into contact with the curb provided on the road shoulder during traveling, the end portion of the elastic crawler plate 10 protruding outward from the iron shoe plate 2 is covered with the elastic body. Since it was broken, it does not damage the curb.

The elastic crawler plate 10 mounted is
Since the reinforcing portion 15 bent to the non-ground plane side is provided at the longitudinal end portion of the cored bar 11, and the elastic pad 17 having the tip portion 17a enclosing the core portion with the elastic body is integrally formed, For example, even when a large load is applied due to contact with the curb or the like, the stress concentration is alleviated by the buffering by the elastic body forming the tip portion 17a, and cracking can be prevented. Further, at the end portion of the cored bar 11, by covering the periphery of the reinforcing portion 15 with an elastic body, peeling durability is remarkably improved due to non-exposure of the adhesive interface and an increase in the adhesive area, and it can be used for a long time. Is obtained.

By the way, the tip of the core metal 11 is attached to the mounting portion 11
If the shape (planar shape) is extended as it is along the joint surface 11b of a, when a large load is applied to the tip 17a of the elastic pad 17 from the grounding surface side, the elastic body that covers the tip and the tip of the core bar Stress concentration occurs at the boundary with the (rubber material), and the elastic body is likely to crack at that portion. On the other hand, in the present embodiment, since the tip portion (reinforcing portion 15) of the cored bar 11 is bent to the non-grounded side, a large load acts on the tip portion of the elastic pad 17 from the ground surface side. However, stress concentration is less likely to occur in the elastic body that is received and covered by the inclined surface portion of the tip portion (reinforcing portion 15) of the cored bar 11, and as a result, the occurrence of cracks can be prevented.

Next, FIG. 3 is a front view showing another embodiment of the elastic crawler plate. The elastic crawler plate of this embodiment is basically the same as that of the above-mentioned embodiment, and a part of the structure is different. Therefore,
The parts having the same structures as those in the above-mentioned embodiment are designated by the same reference numerals as those described above, and detailed description thereof will be omitted.

In the elastic crawler plate 10A of this embodiment, when it is mounted on the shoe plate 2, only the outer side portion of the reinforcing portion 15 protruding from the mounting portion 11a of the core metal 11A is ungrounded as described above. It has a structure in which it is bent toward the side and the periphery is covered with an elastic body. The opposite end of the cored bar 11c is extended in the same shape as the mounting part 11a, and an elastic body is adhered to the lower surface of the cored end 11c so as to protrude from the mounting part 11a by a predetermined dimension. The pad 17 is integrally formed. With this structure, the elastic crawler plate 10A also has the same effect as the elastic crawler plate 10 of the above-described embodiment. Even in this form, the end portion of the cored bar may be flattened in the same shape as the reinforcing part and the periphery thereof may be covered with the elastic body. The bond with the pad can be further enhanced.

4 (a) and 4 (b) are sectional views showing the essential parts of another embodiment of the cored bar end portion of the elastic crawler plate. In these embodiments, in the structure in which the longitudinal direction tip portion of the cored bar 11 in the elastic crawler plate is covered with the elastic body, the tip ends 15a and 15b of the cored bar (sites corresponding to the reinforcing portion 15 in the above-described embodiment). ) Is formed in a state different from that described above. Since the main part is basically the same as that of the above-mentioned embodiment, the same reference numeral as that of the above-mentioned one is attached and the detailed description thereof is omitted.

As shown in FIG. 4 (a), the tip end portion 15a of the cored bar is bent at an appropriate dimension s inward in the longitudinal direction from the end 11a 'of the cored bar mounting portion 11a (shoe plate 2). It has a structure in which it is bent and is bent to the non-grounded side. Further, FIG. 4B shows a bending base point P of the tip portion 15b of the core metal.
Is the end 1 of the core bar mounting portion 11a (shoe plate 2)
It is located at a position substantially matching 1a '. If the tip portions 15a and 15b of the cored bar 11 are bent and provided in this manner, at least the end of the elastic track plate overhangs from the end of the shoe plate 2 (from the end of the cored bar mounting portion 11a). When a large load is applied to the overhanging part from the ground side when using it, it is received by the entire slope of the bent part, preventing stress concentration on the elastic body of that part. Therefore, the durability can be improved. In addition, the core bar tip 15
When the bending base points P of a and 15b are located outside the vertical bottom surface that passes through the end portion of the shoe plate 2 (represented in the above embodiment), there is an advantage that the overhang length can be increased.

The elastic pad 1 on the elastic crawler plate
With respect to the longitudinal end portion of 7, if the tip portion of the core metal is in a state of protruding from the end portion of the shoe plate 2 in the longitudinal direction as described above, the above-described operational effect can be obtained. When the bent end 15c is located in the vicinity of a vertical plane passing through the end of the shoe plate 2, the tip of the elastic pad 17 is placed on the vertical plane passing through the end of the shoe plate 2, as shown in FIG. It is possible to prevent damage at the time of contact with a curbstone or the like even if an appropriate amount n is projected. Therefore, it can be said that such a configuration also belongs to the category of the present invention.

Further, as shown in FIG. 6, the longitudinal end portion 2b of the shoe plate 2B is bent toward the non-grounded side, and the tip end portion in the longitudinal direction of the core metal 11B of the elastic track plate 10B to be mounted is attached. 15d is made to incline toward the non-grounding side in accordance with the inclination of the end 2b of the shoe plate 2B, and the tip of the elastic pad 17B is made to be the tip of the core metal 1.
It can also be formed so as to have an inclined thickness of 5d.
By doing so, the above-described effects can be obtained.

Further, in the elastic track plate of the embodiment according to the present invention, the core bar is provided with the screw hole 12, and the mounting bolt 8 is provided from the rear side of the shoe plate 2 through the mounting hole 4.
Since there is no protrusion on the adhesive surface between the core metal and the elastic pad 17, the stress concentration due to the external force on the elastic pad is concentrated on the adhesive surface. Does not occur.

[Brief description of drawings]

FIG. 1 is a front view of an elastic shoe plate according to the present invention mounted on an iron shoe plate of a crawler belt.

FIG. 2 is a front view (a), a bottom view (b), and aa in FIG. 2 (a) of the elastic track plate of the present embodiment.
It is a sectional view (c).

FIG. 3 is a front view showing another embodiment of the elastic crawler plate.

4 (a) and 4 (b) are cross-sectional views of essential parts showing another embodiment of a cored bar end portion of an elastic crawler plate.

FIG. 5 is a cross-sectional view of an essential part showing another embodiment of the end portion of the cored bar.

FIG. 6 is a view showing another embodiment of the elastic crawler plate.

FIG. 7 is a plan view (a), a side view taken along line AA (b) and a cross-sectional view taken along line BB (c) of a conventional track plate for a crawler belt.

[Explanation of symbols]

2,2B shoe plate 3 recess 4 mounting holes 8 mounting bolts 10, 10A, 10B elastic track plate 11,11B core metal 11a mounting part 11b Adhesive surface 12 Screw holes for fastening 14 steps 15, 15a, 15b, 15c Reinforcement part 15d tip 17 Elastic Pad 17a Tip of elastic pad

Claims (5)

[Claims] 1. An elastic crawler plate mounted on the ground contact surface side of an iron shoe plate of a crawler belt, wherein the elastic crawler plate is formed so as to project beyond the end of the shoe plate. Elastic footwear. 2. The elastic crawler plate according to claim 1, wherein the elastic crawler plate includes an elastic body forming portion projecting from a longitudinal end of the shoe plate. 3. The elastic shoe plate according to claim 2, wherein at least one end of the elastic shoe plate in the longitudinal direction is bent obliquely upward in a direction opposite to the ground plane. 4. The elastic crawler plate according to claim 2, wherein the bent portion of the core metal is configured such that the tip of the bent portion projects outward from the side end portion of the shoe plate. 5. The elastic track plate according to claim 1, wherein both end portions in the longitudinal direction of the cored bar are covered with an elastic body.