JP3715269B2 - Elastic crawler - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an elastic crawler used for a traveling device such as an agricultural machine, a construction machine, various transport vehicles, and a snow vehicle.
[0002]
[Prior art]
Conventionally, as an elastic crawler, a crawler main body is formed in an endless belt shape by an elastic material such as rubber, and a core metal in a width direction made of a hard material such as metal is embedded in the crawler main body at intervals in the circumferential direction. In addition, there is a material in which a tensile body made of a steel cord having a circumferential endless shape is embedded. Further, guide protrusions for preventing wheel removal are provided on the inner peripheral surface side of the crawler body, and lugs are provided on the ground surface side at predetermined intervals in the circumferential direction.
[0003]
[Problems to be solved by the invention]
In the conventional apparatus, since the core metal in the width direction is embedded in the crawler body made of an elastic material at intervals in the circumferential direction, the crawler body is hung over a plurality of wheels. When passed and used for travel, as shown in FIG. 12, in the portion wound around the wheel 21, the front and rear portions C of the core bar 22 in the circumferential direction of the crawler body 23 are bent into a dogleg shape (hereinafter referred to as a bent portion). C).
[0004]
A repeated load due to the bending acts on the bent portion C of the crawler body 23 to cause fatigue of the tensile body 24 embedded in the crawler main body 23, and the crawler body 23 and the core at the bent portion C Deterioration of the adhesive force between the gold 22 and the tensile body 24 is caused, and the invasion such as peeling and trauma is accelerated, which is a problem in terms of durability.
[0005]
Further, in the vulcanization process in which the elastic material of the crawler main body 23, the core metal 22, and the tensile body 24 are placed in a mold and heated and pressurized, the elastic material of the crawler main body 23 is applied to every corner of the mold. As it moves, the tensile body 24 becomes a state along the cored bar 22 and is bent sharply at the corner of the cored bar 22 as shown in FIG. For this reason, when a grounding load is applied, stress concentrates on the bent portion D of the tensile body 24 to cause fatigue of the tensile body 24 in the bent portion D, and the crawler body in the bent portion D and the vicinity thereof. Deterioration of the adhesive force between 23 and the tensile body 24 is caused.
[0006]
Accordingly, in view of the above problems, the present invention has as its main object to alleviate the bending of the metal core around the wheel winding portion at the front and rear in the circumferential direction of the crawler body and reduce the durability due to the bending fatigue. Another object of the present invention is to alleviate sudden bending of a circumferential reinforcing member such as a tensile body, reduce fatigue due to the bending, and prevent deterioration of durability.
[0007]
[Means for Solving the Problems]
The technical means according to claim 1, which the present invention has taken in order to achieve the above object, includes a core metal 9 in the width direction and a predetermined interval in the circumferential direction in an endless belt-like crawler body 5 made of an elastic material. in the elastic crawler provided at the said core metal 9 of the crawler body 5, on at least one side around the crawler body 5 circumferential rigidity than the elastic material of the crawler body 5 is made of an elastic material is greater The reinforcing member 10 is provided to relieve the bending of the portion of the crawler body 5 wound around the wheel corresponding to the end of the crawler body 5 in the circumferential direction. The thickness A on the side is smaller than the thickness B on the core 9 side of the reinforcing body 10.
[0008]
Further, the technical means described in claim 2 is provided in the crawler body 5 with circumferential reinforcing members 11 and 12 extending in the circumferential direction of the crawler body 5, and the crawler body 5 of the core metal 9 in the crawler body 5. The reinforcing body 10 is formed so that the circumferential reinforcing members 11 and 12 have a gentle shape in a portion where the reinforcing body 10 is provided on at least one of the front and rear sides in the circumferential direction.
[0009]
[Action]
The reinforcing member 10 provided on at least one side of the crawler body 5 in the circumferential direction of the core metal 9 in the crawler body 5 increases the rigidity of the part, and the core metal of the crawler body 5 is wound around the wheel. 9, the bending of the front and rear portions in the circumferential direction is alleviated, and as a result, fatigue of the tensile body provided in the crawler body 5, deterioration of the adhesive force between the tensile body and the core metal, or between the crawler body 5 and the core metal 9, etc. Is reduced.
[0010]
Further, the reinforcing member 10 makes the circumferential reinforcing members 11 and 12 gentle in the circumferential front and rear portions of the core metal 9 of the crawler main body 5, and the circumferential front and rear portions of the core metal 9 of the circumferential reinforcing members 11 and 12. The bend is relaxed.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment. In FIG. 2, reference numeral 1 denotes a tire-driven crawler traveling device, for example, a rear wheel (driving wheel) 2 of a light truck and an idler wheel disposed in front of the light truck. 3 is mainly configured with an elastic crawler 4 interposed between them.
[0012]
As shown in FIGS. 1 to 4, the elastic crawler 4 includes an endless belt-like crawler body 5 made of an elastic material such as rubber, and a lug 6 is disposed in the circumferential direction on the grounding surface (outer peripheral surface) side of the crawler main body 5. A pair of left and right guide protrusions 7 and 8 are provided on the inner peripheral surface side to prevent the wheels 2 and 3 from being removed. Are integrally formed at predetermined intervals.
[0013]
In the crawler body 5, a core metal 9 in the width direction made of a hard material such as a forged product, a casting, or a hard resin is embedded at a predetermined interval in the circumferential direction. , 8, and is composed of a protruding portion 9 a embedded in the guide protrusions 7, 8 and a connecting portion 9 b having a rectangular cross section connecting the left and right protruding portions 9 a.
[0014]
Further, in the crawler body 5, a reinforcing body 10 having a substantially triangular cross section and extending in the width direction of the crawler body 5 of the connecting portion 9 b of the core metal 9 is embedded in the front and rear of the crawler body 5 in the circumferential direction. ing. The reinforcing body 10 is made of an elastic material such as rubber or resin, and is made of a material having higher rigidity (hardness) than the elastic material of the crawler body 5. Accordingly, the front and rear portions of each cored bar 9 in the circumferential direction of the crawler body 5 tend to bend at the portions where the wheels 2 and 3 are wound. Has been.
[0015]
Further, the reinforcing body 10 has a right-angled triangular shape with the crawler main body grounding surface side being a hypotenuse, and the hypotenuse 10a is formed at the portion where the crawler main body 5 is wound around the wheels 2,3. It is preferably formed in an arc shape corresponding to the outer peripheral shape of the wheels 2 and 3 so as to be curved (elastically deformed) along the outer periphery. Incidentally, the reinforcing member 10 is not limited to a triangular cross-section, is an A (anti thickness of the core 9 side of the reinforcing member 10) <B (the thickness of the metal core 9 side of the reinforcing member 10) ing.
[0016]
Further, in the crawler body 5, a tensile body (circumferential reinforcement member) 11 is embedded, in which a number of steel cords that are endless in the circumferential direction of the crawler body 5 are arranged in the width direction of the crawler body 5. And this tensile body 11 is arrange | positioned from the cored bar 9 and the reinforcement body 10 to the crawler main body outer peripheral side, and since the reinforcement body 10 is provided in the crawler main body 5 circumferential direction front-and-back part of the cored bar 9, The tensile body 11 has a comparatively gentle shape along the hypotenuse 10a of the reinforcing body 10 in a portion where the cored bar and the reinforcing body 10 are embedded, and is locally relaxed.
[0018]
FIG. 5 to FIG. 11 show another embodiment, and FIG. 5 shows that the tensile body 11 is disposed on the inner peripheral side of the crawler body from the cored bar 9 and the reinforcing body 10, and the cross-sectional shape of the reinforcing body 10 is approximately isosceles. FIG. 6 and FIG. 7 show that the tensile body 11 in the embodiment is arranged on the inner peripheral side of the crawler main body from the core metal 9 and the reinforcing body 10, and FIGS. 6 and 7 show the core metal 9 and the reinforcing body. 10 shows an endless protective member (circumferential reinforcing member) 12 arranged in the circumferential direction of the crawler main body 5 on the outer peripheral side of the crawler main body 10. This protective member 12 is, for example, rayon, nylon, polyester, steel, Kevlar It is composed of an endless strip of ply formed by bias cutting a fabric mainly composed of a cord material such as.
[0019]
8 shows another embodiment shown in FIG. 5 in which the protective member 12 is disposed on the inner peripheral side of the crawler body and the tensile body 11 is disposed on the outer peripheral side of the crawler body. A reinforcing body 10 is bonded to one end of the core metal 9 in the circumferential direction of the crawler body 5 and the core metal 9 and the reinforcing body 10 are sandwiched between the protective members 12 (or may be sandwiched between the tensile bodies 11). FIG. 10 shows the cored bar 9 with the reinforcing body 10 bonded to the front and rear in the crawler body 5 circumferential direction, and FIG. 11 shows the inside of the reinforcing body 10 by integrally connecting the front and rear reinforcing bodies 10 to each other. Shows a core metal 9 embedded therein.
[0020]
In the above-described embodiment, the elastic crawler used in the tire-driven crawler traveling device is shown, but may be employed in the sprocket-driven crawler traveling device.
[0021]
【The invention's effect】
According to the present invention, an elastic crawler in which a core metal 9 in the width direction is provided at a predetermined interval in the circumferential direction in an endless belt-like crawler body 5 made of an elastic material, the core metal 9 in the crawler main body 5 is provided. Since the reinforcing body 10 is provided on at least one of the front and rear sides in the circumferential direction of the crawler body 5, the reinforcement body 10 relaxes the bending of the front and rear portions of the core metal 9 in the circumferential direction of the crawler body 5 in the portion wound around the wheel. Thus, fatigue due to the bending can be reduced, and the winding around the wheel is smooth, the elongation on the ground contact surface side of the crawler body 5 is relaxed, and the durability can be improved as described above. Further, by relaxing the bending, the adhesion fatigue between the crawler body 5 and the cored bar 9 or the tensile body is reduced, and the peel strength can be maintained.
[0022]
In addition, in the portion where the reinforcing body 10 is provided on at least one side of the crawler body 5 in the circumferential direction of the core metal 9 in the crawler body 5, the circumferential reinforcing members 11, 12 have a gentle shape. Since the reinforcing body 10 is formed, it is possible to avoid the circumferential reinforcing member from bending locally at the front and rear portions of the core metal 9 in the circumferential direction of the crawler body 5 as in the prior art. Fatigue due to bending of the circumferential reinforcing portions 11 and 12 at the front and rear portions in the circumferential direction of the main body 5 is alleviated, and durability can be improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an elastic crawler according to an embodiment.
FIG. 2 is a side view of the crawler traveling device.
FIG. 3 is a cross-sectional view of the crawler traveling device.
FIG. 4 is a plan view of the crawler body viewed from the inner peripheral surface.
FIG. 5 is a side sectional view of an elastic crawler according to another embodiment.
FIG. 6 is a side sectional view of an elastic crawler according to another embodiment.
7 is a cross-sectional view of a crawler traveling device corresponding to the elastic crawler according to the embodiment of FIG. 6;
FIG. 8 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.
FIG. 9 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.
FIG. 10 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.
FIG. 11 is a cross-sectional view of a cored bar and a reinforcing body according to another embodiment.
FIG. 12 is a side sectional view of a crawler traveling device according to a conventional example.
[Explanation of symbols]
4 Elastic Crawler 5 Crawler Main Body 9 Core Bar 10 Reinforcement Body 11 Tensile Body (Circular Reinforcement Member)
12 Protection member (circumferential reinforcement member)

Claims (2)

In an endless crawler body (5) made of an elastic material, an elastic crawler in which a core metal (9) in the width direction is provided at a predetermined interval in the circumferential direction,
On at least one side of the crawler body (5) in the circumferential direction of the core (9) in the crawler body (5) ,
Rigidity than the elastic material of the crawler body (5) is made of an elastic material is greater, the crawler present of (5), in wrapping around a portion on the wheel, the metal core (9), the crawler body (5) Reinforcing body (10) for relaxing the bending of the portion corresponding to the circumferential end
Provided,
Elasticity characterized in that the thickness (A) of the reinforcing body (10) on the side opposite to the metal core (9) is smaller than the thickness (B) of the reinforcing body (10) on the side of the metal core (9). Crawler. Provided in the crawler body (5) are circumferential reinforcing members (11), (12) extending in the circumferential direction of the crawler body (5),
In the portion of the cored bar (9) in the crawler main body (5) provided with the reinforcing body (10) on at least one side of the crawler main body (5) in the circumferential direction, the circumferential reinforcing members (11), ( The elastic crawler according to claim 1, wherein the reinforcing body (10) is formed so that 12) has a gentle shape.

Images