JPH10297553A - Elastic track shoe of crawler belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crack and separation due to contact by setting up a metal plate, which is locked tight to a link at a link surface side, and also attached to a tension member via a bolt at a tension member side, in the interval between the link and the tension member. SOLUTION: An elastic track shoe 10 made up of covering a tension member 1 with an elastic body 2 under welding, is set up in the longitudinal direction of a crawler. A symmetrical pair of links in contact with the tread of each track driving roller superpose two adjacent links in the longitudinal direction of the crawler, connecting them together with a pin 4. A link 3 and a metal plate 6 are integrally joined together by means of welding, and an insertional hole into which a bolt 5 is inserted is installed in this metal plate 6. The tension member 1 is provided with a tapped hole for this bolt 5. The metal plate 6 and the tension member 1 both are installed through the bolt 5. The elastic body 2 of the elastic track shoe 10 is formed into such a trapezoidal form as being successively reduced toward both right and left ends from the central part, and thereby a shear of earth and sand becomes enlarged in all directions by inclination, generating a tractive force. It is so structured as to take it with the tapped hole 1a, and a head part of the bolt is exposed at the side of a noncontact surface, therefore the bolt head and the elastic body will not come into contact with each other, and thus durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless track elastic track plate used for a tracked vehicle of construction equipment such as a hydraulic shovel or a bulldozer, and more particularly to a core member which is a component of the elastic track plate. The invention relates to an endless track elastic track plate having an improved structure for attaching bolts to a link.

[0002]

2. Description of the Related Art Standard vehicles of construction machines such as hydraulic excavators and bulldozers are operated with iron crawler tracks. A conventional iron crawler belt will be described with reference to FIG. 8 and FIG. 9 in a Z view of FIG. FIG. 8 is a view of the iron crawler belt viewed from the non-ground surface side. The iron crawler plate 42 includes a pair of left and right links 41a,
A bolt 43 and a nut 46 are fastened to 41b. A pair of left and right links 41a, 41a,
41b, 41b are connected by a plurality of pins 45,
It is integrated endlessly. Incidentally, construction machines equipped with iron crawler belts have problems such as damaging the road surface of asphalt when traveling on public roads due to movement between work sites and the like. Recently, vehicles equipped with rubber crawler belts are increasing. This rubber crawler is formed by embedding a large number of core wires and cores in endless rubber, but if a defect such as cracking or peeling of rubber occurs, it is difficult to repair it, so replace the rubber crawler with a new one. And there is a problem that user cost increases. In order to solve such a problem, an elastic footwear plate in which an elastic body such as rubber is adhered to an iron footwear plate is used. Also recently 1
A number of elastic crawler boards, each of which has a core embedded in an elastic body, are arranged in the longitudinal direction of the crawler to form an endless track belt.

As a prior art in which an elastic material is adhered to an iron shoe plate, Japanese Utility Model Laid-Open No. 5-78684 has been filed. The content of this application is an iron product in which bolt holes are formed at positions near both ends in the length direction, where a plurality of lugs are made to protrude toward the shoe surface at a constant interval from each other in the length direction. In the crawler, a metal plate superimposed according to the shape of the shoe surface of the crawler, an elastic body such as rubber integrally attached to the surface side of the metal plate, and the metal plate on both ends of the crawler A bolt protruding from the back side of the metal plate to be attached to the formed bolt hole, wherein the head of the bolt is on the front side of the metal plate and is embedded in an elastic body such as rubber. Endless track belt.

The applicant has filed Japanese Patent Application Laid-Open No. Hei 8-48269 as prior art relating to elastic footwear. The content of this application is an endless track crawler belt formed by connecting a track plate and a link with bolts and connecting the track plate with a plurality of links, and as shown in FIGS. The plate is made up of an elastic body 31 having a bolt insertion hole 35 and a core body 32 having a bolt mounting hole 36. The core body 32 is embedded in the elastic body 31 to be integrated with the core body 32 and Are the bolt seat surface 37 and its vicinity, and the mounting surface to the link 34 and its vicinity 38
Are described, respectively.

[0005]

However, the track plate for the endless track described in Japanese Utility Model Application Laid-Open No. 5-78684 is protruded from the back side of the metal plate in order to attach the metal plate to bolt holes formed at both ends of the track plate. The head of the bolt is located on the front side of the metal plate and is embedded in an elastic body such as rubber. In this case, a high stress is generated in a contact portion between the inside of the elastic body such as rubber and the bolt head, and the elastic body such as rubber has a problem that the durability life is short due to cracking or peeling at an early stage. In addition, the elastic crawler described in JP-A-8-48269 is disclosed in FIGS.
As shown in (1), since the elastic body 31 is provided with the bolt insertion holes 35, cracks and peeling from the bolt insertion holes 35 may occur.

The present invention focuses on the above-mentioned problems of the prior art, and extends and covers and adheres an elastic body from the entire surface on the grounding surface side of the core body to the non-grounding surface side. The endless track belt elastic body footplate that inserts bolts from above to fasten multiple cores and links arranged in the longitudinal direction of the crawler to prevent cracks and peeling due to contact between the bolts and the elastic body The purpose is to provide.

[0007]

In order to achieve the above object, a first invention of an endless track elastic footwear according to the present invention is provided in which end portions adjacent to each other are connected via pins. The link 3a, 3b and the core are connected to each other in a crawler belt of an endless track including a link connected to the link and an elastic base plate having a core that is not covered with at least a surface that comes into contact with the link surface. A metal plate 6 fixed to the links 3a and 3b on the link surface side and attached to the core 1 via bolts 5 on the core side is arranged between the body 1 and the body. According to the above configuration, the actual open square 5
In JP-B-78684, a high stress is concentrated due to the contact between the head of the bolt and the elastic body to cause cracking or peeling, and in the case of JP-A-8-48269, a bolt is inserted through a bolt insertion hole provided in the elastic body. In order to solve the problem of cracking and peeling, the present invention provides a bolt 5 which is inserted into an insertion hole of a metal plate 6 from the non-ground surface side and is attached to a screw hole 1 a provided in the core 1. The head has a structure that is exposed to the non-grounding surface side, so that the head of the bolt does not contact the elastic body, so that cracking or peeling of the elastic body does not occur and durability is improved.

A second invention is the same as the first invention, except that a bolt hole is provided in the metal plate 6 and a bolt screw hole 1a is provided in the core 1. According to the above configuration, it is not necessary to dispose a bolt in an elastic body as in the Japanese Utility Model Application Laid-Open No. 5-78684 and it is not necessary to provide a bolt insertion hole in the elastic body as in the Japanese Patent Application Laid-Open No. 8-48269. And the cost is low.

According to a third aspect of the present invention, in the configuration of the first aspect, the core body 1 has a bolt screw hole 1a and the elastic body 2 covering the core body 1 has a space 1b near the bolt screw hole 1a. It is what it was. According to the above configuration, since the tip of the bolt 5 for attaching the core 1 and the metal plate 6 is inserted into the space 1b provided inside the elastic body 2, the bolt 5 and the elastic body 2 come into contact with each other. No cracks or the like are generated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A crawler belt elastic track plate according to the present invention will be described below with reference to FIGS. FIG. 1 is a diagram of an elastic crawler plate of the endless track belt viewed from a non-ground surface side. FIG. 2 is a W view of FIG. First, as shown in FIGS. 1 and 2, an elastic body 2 such as rubber is coated and adhered to a core body 1. The core body 1 covered with the elastic body 2 is called an elastic body footplate 10. A large number of the elastic footwear boards 10 are arranged in the longitudinal direction of the crawler. A pair of left and right links 3a, 3b abutting on tread surfaces of rolling wheels such as lower rolling wheels (not shown) are adjacent links 3a, 3a, 3b, 3 in the front-rear direction of the crawler.
b. The two members are overlapped and connected by pins 4 and 4. The links 3a and 3b and the metal plate 6 are integrally fixed by welding. The metal plate 6 has an insertion hole into which the bolt 5 is inserted. The core body 1 is provided with a screw hole 1a shown in FIG. The metal plate 6 and the core 1 are attached by bolts 5 and 5.

As shown in FIG. 3, the core body 1 extends from the grounded surface side to the non-grounded surface side, and the entire surface up to a predetermined position is covered with the elastic body 2 and adhered. The elastic body footplate 10 shown in FIG. 4 in the X view of FIG. 3 indicates the ground contact surface side, and the core body 1 is entirely covered with the elastic body 2 so as not to come into contact with earth and sand. The elastic body 2 of this elastic body footboard 10 is
It has a trapezoidal shape that gradually reduces from a to the left and right ends. Since the elastic body 2 has a trapezoidal shape, the shear of the earth and sand is increased on the inclined surface 2b in the front, rear, left, and right directions, so that traction force is generated. The screw holes 1a provided in the core body 1 shown in FIGS. 3 and 4 are not exposed on the ground surface side but are exposed on the non-ground surface side. Thus, the core 1 and the metal plate 6 are attached by the bolt 5 on the non-ground surface side. FIG. 5 is a sectional view taken along line AA of FIG. As shown in FIGS. 3 and 5,
A space 1b communicating with a screw hole 1a provided in the core 1 is provided on the elastic body 2 side. The space 1b prevents the tip of the bolt 5 from contacting the elastic body 2 to concentrate stress and prevent cracks or the like when the core 1 and the metal plate 6 are attached with the bolt 5. .

Next, the operation of FIGS. 1 to 5 will be described. In the crawler track plate described in Japanese Utility Model Application Laid-Open No. 5-78684, high stress is generated in a portion where the inside of the elastic body such as rubber and the bolt head come into contact, and the elastic body such as rubber is cracked at an early stage. In addition, there is a problem that the durable life is short due to peeling, and the elastic footwear plate described in JP-A-8-48269 has a bolt insertion hole 35 in the elastic body 31, so that the bolt insertion In contrast to the problem that cracks and peeling occur from the holes 35, the elastic footwear plate of the present invention has a pair of left and right links 3a and 3b of the endless track belt and the metal plate 6 fixed by welding. The metal plate 6 and the core 1 of the elastic body 10 are
It is intended to be attached by. The bolt 5 is inserted into the insertion hole of the metal plate 6 from the link 3a, 3b side, that is, from the non-ground surface side, and is attached by the screw hole 1a provided in the core body 1. Has a structure exposed to the non-ground surface side. Thereby, the bolt 5 is inserted into the insertion hole of the metal plate 6 from the non-grounding surface side, is attached to the screw hole 1a provided in the core body 1, and the head of the bolt is exposed to the non-grounding surface side. Since the head of the bolt and the elastic body do not contact each other, the elastic body is not cracked or peeled off, and the durability is improved. Further, since the tip of the bolt 5 for attaching the core body 1 and the metal plate 6 is inserted into the space 1b provided inside the elastic body 2, the bolt 5 and the elastic body 2 come into contact with each other to cause a crack or the like. Never do. Further, according to the elastic footwear of the present invention, a bolt is arranged in an elastic body as in the Japanese Utility Model Application Laid-Open No. 5-78684, and a bolt insertion hole is formed in the elastic body as in the above-mentioned Japanese Patent Application Laid-Open No. 8-48269. Since there is no need to provide
It is easy to manufacture and the cost is low.

The present invention can be applied to small to large construction machines using the crawler belt elastic crawler of the present invention, and can also be applied to crawler belt elastic crawler of industrial and agricultural machines other than construction machinery. Needless to say.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an elastic crawler plate of an endless track belt according to the present invention as viewed from a non-ground surface side.

FIG. 2 is a W view of FIG. 1;

FIG. 3 is a side view of the elastic footwear plate.

FIG. 4 is an X view of FIG. 3;

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

FIG. 6 is an explanatory view of one example of a conventional elastic footwear plate.

FIG. 7 is a Y view of FIG. 6;

FIG. 8 is an explanatory view of a conventional iron crawler belt.

FIG. 9 is a Z view of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 1a Screw hole 1b Space part (elastic body inside) 2 Elastic body 3a, 3b Link 4 Pin 5 Bolt 6 Metal plate 10 Elastic body footboard

Claims (3)

[Claims] A link connected between the end portions adjacent to each other via a pin; and an elastic crawler plate having a core connected to the link and having at least a surface abutting on the link surface not covered. In the crawler belt of the endless track belt, a metal plate fixed to the link on the link surface side and attached to the core via a bolt on the core side is provided between the link and the core. An elastic track board in the endless track zone. 2. A crawler belt according to claim 1, wherein the metal plate has a bolt hole and the core has a bolt screw hole. 3. A core body having a bolt screw hole,
2. The crawler belt according to claim 1, wherein a space is provided near a bolt screw hole of the elastic body covering the core body.