JPH072473B2 - Endless orbit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an endless track zone of a vehicle, and particularly to an endless track zone provided with a rubber cushioning material so as not to damage the road surface when traveling on a paved road surface. .

[Conventional technology]

Many of the endless tracks of construction machinery have steel shoes, but if such a machine travels on the paved road surface, it will damage the road surface, so install a rubber block on the ground surface of the shoe. Are disclosed in, for example, Japanese Utility Model Publication No. 50-132824 and Japanese Utility Model Publication No. 50-27071. In addition, for small construction machines, an endless track made entirely of rubber has been released in recent years.

[Problems to be solved by the invention]

When a crawler belt vehicle changes direction, a large torsional stress is applied to the contact surface of the shoe. Therefore, in the case of a shoe made of steel, the road surface is largely peeled off, but when a rubber block is attached to the grounding surface of the shoe, the rubber block cannot be resisted by this torsional stress and the rubber block is peeled off.
It is considered that this is because stress concentrates on the portion where the rubber block is attached to the shoe, and the fracture grows from there. Therefore, attempts to attach the rubber block to the shoe have never been successful.

The all-rubber crawler belt is used only in small construction machines, so the stress at the time of direction change is relatively small, but it has a short life and cannot be partially repaired once it is broken. In addition, the entire expensive endless track must be replaced.

Therefore, the present invention is intended to realize an endless track body which does not damage the paved road surface and has a long life.

[Means for Solving the Problems]

The crawler belt according to the present invention, like the conventional steel crawler belt, has a plurality of links having shoes connected to each other in an endless chain. Each shoe has a trough-shaped recess with both ends closed to the ground plane in a direction orthogonal to the link, and the diameter and length are approximately equal to the width and length of the recess, respectively. The rubber-made cylindrical cushioning material is stored in such a manner that a substantially half portion around it is projected.

At the center of the columnar cushioning material, a round bar-shaped or cylindrical tubular reinforcing member made of steel is fixed by penetrating it. The portions of the reinforcing body that project from both ends of the cushioning material are prismatic or prismatic. A square hole is formed in a closed portion at one end of the recess, and one protruding portion of the reinforcing body is inserted into the square hole. A cutout is formed in the closed portion at the other end of the recess, and the other protruding portion of the reinforcing body is received in the cutout. And
The escape prevention member is detachably attached to both sides of the cutout so that the latter protruding portion does not escape from the cutout.

[Action]

When a vehicle travels on a paved road surface, a part of the columnar cushioning material comes into contact with the road surface. However, since the contact area is small, friction with the road surface when the direction is changed is relatively small. In addition to this, the stress generated inside the cushioning material at the time of turning is due to the fact that it has a cylindrical shape and its surface is not fixed to another object, and that the surface of the reinforcing body has a cylindrical shape. Since the rubber is not concentrated on the entire surface and is smoothly dispersed, the rubber is unlikely to break, and the cushioning material is hardly damaged.

Furthermore, if the grounding part of the cushioning material is significantly worn due to long-term use, remove it from the shoe and attach it at a different angle so that another part will ground, so that it can be used for a longer period of time. You can

〔Example〕

In FIGS. 1 to 7, reference numeral 1 denotes a rubber columnar cushioning material, through which a circular tubular reinforcing member 2 made of steel penetrates,
Portions 3 and 4 of the reinforcing body 2 protruding from both end surfaces of the cushioning material 1 are processed into a quadrangular prism shape.

Reference numeral 10 is a shoe, and two projecting portions 11 and 12 are projectingly provided on the ground surface thereof to form a recess 13 therebetween, and both ends of the recess 13 are closed by closing members 14 and 15. The width and the length of the recess 13 are approximately equal to the diameter and the length of the cushioning material 1, respectively, and the depth of the recess 13 is about half the diameter of the cushioning material 1. The closing member 14 is provided with a square hole 16 into which the quadrangular prismatic projecting portion 3 of the reinforcing body 2 can be inserted with an appropriate margin.
A notch 17 having a width that allows the protruding portion 4 of the reinforcing body 2 to enter and exit with a proper margin is formed in the portion 15. Between the end surface of the cushioning material 1 and the closing member 15, as shown in FIG.
The escape prevention member 19 having the above is sandwiched, and the square hole 18 has a size capable of inserting the protruding portion 4 with an appropriate margin.
The escape prevention member 19 includes a screw hole 20 and a protruding piece 21 protruding from the lower end.
The projection 21 is fitted into the engagement hole 22 formed in the bottom of the recess 13. Then, the bolt 23 penetrating the closing member 15 is screwed into the screw hole 20.

A pair of links 30, 30 in a direction orthogonal to the recess 13 is attached to the surface of the shoe 10 opposite to the ground surface by welding. As shown in FIG. 7, the links 30, 30 have a wide spacing portion 30a having a wide mutual spacing and a narrow spacing portion 30b having a narrow mutual spacing, and are connected to each other by a bush 31 at the narrow spacing portion 30b. Axial holes 32 and 33 are bored in the wide interval portion 30a and the narrow interval portion 30b, respectively, and the axial hole 33 is continuous with the inner cavity of the bush 31.

As shown in FIG. 4, wide spacing portions 30a, 30a of the links 30, 30
Narrow space portions 30b ', 30b' of adjacent links are sandwiched between and are connected by a pin 34 inserted into the shaft hole 32. Further, the narrow gap portions 30b, 30b of the links 30, 30 are inserted between the wide gap portions 30a ', 30a' of another adjacent link, and are connected by the pin 35 inserted through the shaft hole 33 and the bush 31. In this way, the endless track zone is completed by connecting a number of links in an endless chain.

When the vehicle equipped with the above-mentioned endless track changes its direction, as shown in FIG.
A stress F is applied to, and a stress F ′ in the opposite direction is applied to the grounding point at the other end. The stress F becomes an internal stress G inside the cushioning material 1, appears in a concentric circle around the reinforcing body 2, is large in the surface layer portion, and is small inside. However, the cushioning material 1 is a recess
The internal stress G is smoothly dispersed and is not concentrated because it is only received in 13 and is not fixed to the recess wall. The same applies to the internal stress due to the stress F '. In this way, since the concentration of internal stress does not occur, the cushioning material 1
Can withstand the stresses F and F '.

By the way, when the rubber block for cushioning is attached to the shoe by bolts or press fittings as in the conventional example described in the above-mentioned publication, stress is applied around the bolts, edges and corners of the press fittings, etc. Concentration occurs, and the block breaks from that point as the starting point. Even when the cylindrical cushioning material as in the present invention is used, if a rectangular rod or a rectangular tube is used for the reinforcing body, stress concentrates on the corners of the reinforcing rods and breaks occur.

When the portion of the cushioning material 1 that is always grounded due to long-term use is worn out, the screw 23 is loosened and the escape prevention member is removed to cause the protruding portion 4 of the reinforcing body to escape from the cutout portion 17, and then the protruding portion 3 is squared. The cushioning material 1 can be removed from the shoe 10 by pulling it out from the hole 16. Therefore, if the cushioning material 1 is rotated and attached to the shoe again, the non-abraded portion of the cushioning material 1 comes into contact with the ground, so that it can be used again for a long period of time.

FIG. 9 shows an embodiment in which the shape of the recess of the shoe 10 is different, and the recess 13 'has a prismatic surface instead of a semi-cylindrical surface.

FIG. 10 shows an embodiment in which the shape of the escape prevention member is different,
The escape prevention member 19 'includes end portions 26 and 27 fixed to the closing member 15 by screws 24 and 25, respectively, and a bridging portion 28 connecting these end portions, and the bridging portion 28 is notched. The open ends of the portions 17 are connected to each other so that the protruding portion 4 of the reinforcing body does not come out from the cutout portion 17.

〔The invention's effect〕

As described above, according to the present invention, since the cushioning material made of rubber is provided at the ground contact portion of the endless track zone, the paved road surface is not damaged, and the cushioning material prevents the direction change or the like. Since internal stress is dispersed even under adverse conditions, damage due to concentration of stress hardly occurs, and when a part of the cushioning material is worn due to long-term use, the cushioning material can be used again for a long time by changing the mounting posture. Has a very long life.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a front view of the shoe, FIG. 2 is a right side view of the shoe, and FIG.
Fig. 4 is a left side view of the shoe, Fig. 4 is a reduced bottom view of the endless track body, Fig. 5 is a sectional view taken along the line AA in Fig. 2, and Fig. 6 is B- in Fig. 1. Sectional view taken along line B,
FIG. 7 is a side view of the escape prevention member, FIG. 8 is an explanatory view of stress acting on the cushioning material, FIG. 9 is a sectional view of a portion corresponding to FIG. 6 of another embodiment of the present invention, and FIG. The drawing is a right side view of still another embodiment of the present invention. 1 ... Cushioning material, 2 ... Reinforcement body, 3 and 4 ... Prism-shaped projecting portion, 10 ... Shoe, 13 ... Recess, 14 and 15 ... Recess closing portion, 16 ... Square hole , 17 ... Notches, 19 and 19 '...
… Escape prevention member, 30 …… Link, 34 and 35 …… Connecting pin.

Claims (1)

[Claims] 1. A plurality of links having shoes contacting with the ground are connected to each other in an endless chain shape, and a gutter-shaped recess whose both ends are closed is provided on a ground surface of the shoe in a direction orthogonal to the links. A rubber columnar cushioning material having a diameter and a length substantially equal to the width and length of the recess is housed in the recess by exposing substantially half of the peripheral surface thereof, and in the cushioning material, A round bar-shaped or circular tube-shaped steel reinforcing body penetrating the center of the reinforcing body is fixed, and portions of the reinforcing body projecting from both ends of the cushioning material are formed into a prismatic shape or a rectangular tube shape. The portion is inserted into a square hole formed in the closed portion at one end of the recess, and the other protruding portion of the reinforcing member is positioned in the cutout portion formed in the closed portion at the other end of the recess. The escape prevention member is detachably provided across both sides of the Orbital band.