JPH0623515Y2 - Crawler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a crawler used for an agricultural machine such as a combine, a snow blower, or a construction machine.

(Prior Art) FIG. 11 shows a crawler disclosed in Japanese Patent Laid-Open No. 60-1082, in which a derailing prevention projection 5 is integrally projected from a core material 4 embedded in a belt-shaped main body 2. ing. The protrusions 5 are T-shaped, have a length in the circumferential direction of the main body that is the same as the width of the core member 4, and are provided in a pair of left and right outside the engagement holes for the drive wheels in the width direction.
5d is embedded in the main body 2 and both ends 5c are actually manufactured.
There is no space below.

(Problems to be Solved by the Invention) Since the core material 4 is embedded in the crawler body 2,
The root portion 5d of the protrusion 5 is also inside the rubber, and when the crawler is engaged with the drive wheel and bent, the rubber between the protrusion root portions 5d is better than the rubber between the core material main body portions in the circumferential direction of the main body. , Due to the short distance from the center of curvature, bending and stretching are severe. If there is a rubber material below both ends 5c of the protrusion 5, the bending and stretching become more severe. Stress concentration occurs in the crawler due to this strong bending and stretching, and repeated repeated cracks may cause rubber fracture due to compression fatigue, etc., which also leads to damage to the circumferential tensile body such as steel cord in the elastic body. Sometimes.

The present invention forms an extension hole from the engagement hole to the outside from the approximate center of the core protrusion in the width direction of the main body, thereby eliminating bending and stretching of rubber between the protrusions, thereby preventing stress concentration. Intended to provide crawlers.

(Means for Solving the Problem) A specific means for achieving the object of the present invention is to provide the crawler main body 2 formed of a rubber-like elastic material in an endless belt shape at the drive wheel engaging engagement holes 8 at regular intervals in the circumferential direction. And a core member 4 is embedded between the engaging holes 8 and protrudes toward the inner peripheral side of the main body in the core member 4 and is located on both outer sides of the engaging hole 8 in the main body width direction.
In a crawler in which a pair of projections 5 are provided, and an end portion 5C of the projections 5 is projected from the core metal main body portion in the circumferential direction of the crawler main body, an extension hole 10 extending from the engaging hole 8 to the outside of the projection 5 in the main body width direction.
Is formed, and the end portion 5C of the protrusion 5 is superposed on the extension hole 10 in a plan view.

(Operation) The ring-removal preventing projection 5 protruding from the core material 4 embedded in the crawler body 2 toward the inner peripheral side of the body also protrudes from the core material 4 toward the main body circumferential direction, and the crawler 1 shown in FIG. During bending, the circumferential distance between the protrusions 5 becomes short. Although the distance between the protrusions 5 expands and contracts due to the bending and stretching of the crawler 1, the extension hole 10 is formed so as to project outward from the engagement hole 4 in the width direction of the main body, and the main body portion for compressing the protrusion 5 is eliminated. The crawler body does not expand or contract between the protrusions 5, and even if the end 5C of the protrusion 5 swings in and out of the crawler due to the swinging of the core metal 4 when the crawler 1 is bent, the end 5C remains Since it is not in close contact with, it does not peel off.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 5, the main body 2 of the crawler 1 is formed of an elastic material such as rubber in an endless annular band shape, and the lugs 3 are integrally formed on the outer peripheral side serving as a grounding surface at regular intervals in the circumferential direction. It is molded. A core material 4 is embedded in the main body 2 at regular intervals in the circumferential direction so as to correspond to the lug 3 in the embodiment. The core material 4 serves as a tensile member in the width direction of the main body 2.
Left and right 1 which is shorter than the width of the main body 2 and protrudes toward the inner peripheral surface of the main body
It has a pair of wheel removal preventing projections 5.

At the center of the main body 2 in the width direction, the lug 3 is arranged in the circumferential direction.
And an engaging hole 8 into which the engaging claw 7 of the drive wheel 6 engages between the core member 4 and
The engaging hole 8 is formed on the inner side of the inner side surface 5a of the projection 5 and has a width narrower than the space between the left and right projections 5, and the width with which the engaging claw 7 can engage. If it is good.

The core member 4 is formed of a cast product, an iron plate, a synthetic resin, or the like, and the main body portion thereof has a flat plate shape, and the left and right protrusions 5 are integrally molded or joined thereto. Also protrudes in the circumferential direction of the main body 2. The shape of the protrusion 5 may be the T-shape shown in FIG. 11 or may be a tapered shape.

Extending holes 10 are formed in the crawler body 2 so as to project from the engaging holes 8 to both sides in the width direction of the body. Since the extension hole 10 has the same circumferential length as the engagement hole 8, the extension hole 10 is
One large hole is to be formed, and the protrusion amount is outside the outer surface 5b of the left and right protrusions 5, and the width L of one large hole is L.
Two protrusions 5 are located inside, and both ends 5c in the circumferential direction of each protrusion 5 overlap the extension hole 10 in a plan view. Therefore, both ends
There is no rubber material below 5c.

In the crawler body 2, a circumferential tensile member 11 made of steel cord or the like is embedded outside the extension hole 10 in the width direction. The tensile body 11 is located on the outer peripheral side of the core material 4.

In the second embodiment shown in FIGS. 6 to 8, this crawler 1 is used.
In the core material 4, the both ends 5c of the de-ringing prevention projection 5 are largely projected in the circumferential direction of the main body, and end portions of the projections 5 adjacent to each other in the circumferential direction of the main body.
Since 5c are superposed on each other, it is possible to prevent the wheel from slipping off all over the circumference of the crawler 1.

Similar to the first embodiment, the extension hole 10 extends between the core members 4 in the circumferential direction of the main body, and the outer surface 5b of the protrusion 5 in the widthwise direction of the main body.
It is formed further outward, and has a shape in which the engagement hole 8 is enlarged, and even if both ends 5c of the protrusion 5 largely project, they do not come into contact with the portion between the core members 4 in the circumferential direction of the main body when the crawler bends, There is no room for concentrated stress to occur.

The edge of the crawler body 2 facing the extension hole 10 is an inclined surface 12. When the inclined surface 12 is provided, the width L of the extension hole 10 can be narrowed.

FIGS. 9 and 10 show two comparative examples of the extension hole 10. The extension hole 10 of FIG. 9 projects outward in the width direction from the circumferential center of the engaging hole 8, and the projecting amount is the core material. 4 to the center of the protrusion 5 in the width direction. The extension hole 10 in FIG. 10 is the circumferential direction 2 of the engagement hole 8.
It protrudes outward from the location beyond the outer surface 5b of the projection 5.

The extension holes 10 of both comparative examples are not overlapped with both ends 5c of the protrusion 5, but the main body 2 part between the two protrusions 5 in the circumferential direction is changed from a continuous state to a discontinuous state of 2 or 3 parts. Therefore, it is designed so as not to be subjected to the expansion and contraction action due to the bending of the main body 2 or to be drastically reduced. However, when both ends 5C of the protrusion 5 have the base side up to the crawler body as in the first embodiment, the base side is surrounded by the rubber of the crawler body 2, and when the core metal 4 swings. In addition, there is a possibility that relative movement will occur between the crawler body 2 and the crawler body 2 and peeling will occur. Therefore, in the crawler whose end 5C is not separated from the inner peripheral surface of the crawler body 2, it is preferable to expose the end 5C to the extension hole 10.

(Effect of the Invention) According to the present invention described in detail above, the extension hole 10 is formed from the engagement hole 8 to the outer side in the main body width direction of the projection 5, and the end 5C of the projection 5 is flattened in the extension hole 10. Since the end portions 5C of the protrusions 5 project from the core metal main body portion in the circumferential direction of the crawler body, the rubber is not bent or stretched between the circumferential portions of the protrusions 5 when the crawler 1 is bent. No stress concentration,
Moreover, since the end portion 5C is not in close contact with the rubber of the crawler body 2, peeling does not occur, and it is possible to prevent rubber breakage and peeling and improve the durability of the crawler.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a plan view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. Is a sectional view taken along line III-III in FIG. 1, FIG. 4 is a perspective view of a core material, FIG. 5 is a sectional view in a state in which drive wheels are mounted, and FIGS. 6 to 8 show a second embodiment. FIG. 6 is a plan view, and FIG. 7 is VI of FIG.
A sectional view taken along the line I-VII, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6, and FIGS. 9 and 10 are plan views showing two comparative examples of extension holes, respectively.
FIG. 11 is a sectional view showing a conventional technique. 1 ... crawler, 2 ... body, 3 ... lug, 4 ... core material, 5 ... protrusion, 8 ... engaging hole, 10 ... extension hole.

Claims (1)

[Scope of utility model registration request] 1. A crawler main body (2) formed of a rubber-like elastic material in an endless belt form, with drive wheel engaging holes (8) formed at regular intervals in the circumferential direction, and the engaging holes (8). ), The core material (4) is embedded between the core material (4), and the engagement hole (8) protrudes toward the inner peripheral side of the main body in the core material (4).
In a crawler in which a pair of protrusions (5) located on both outer sides in the width direction of the main body are provided, and an end (5C) of the protrusion (5) is projected from the main body of the core bar in the circumferential direction of the crawler main body, A hole extending from the hole (8) to the outside of the protrusion (5) in the width direction of the main body
(10) is formed, and the end (5C) of the protrusion (5) is formed in this extension hole (10).
A crawler characterized by being superposed in a plan view.