JPH10129544A - Sprocket for rubber clawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing precess to make a cost inexpensive, by closely fixing a sprocket base body, wherein the whole sprocket periphery is evenly divided in a peripheral direction, to a hub connected to a driving spindle. SOLUTION: In a sprocket main body 1 having a shape wherein the whole sprocket is equally divided in a peripheral direction, pins 3 are stoodly provided between fanlike plates 2 and outer edges, and flanges 4, contacting the inner peripheral surface of a rubber clawler, are formed on the outer edges of the fanlike plates 2. An inner flange 6 is inwardly formed on the crosslinking part 5 of the inner edges of the fanlike plates 2 to form a hub and a fixing hole. A fixing hole 12 is provided on a circle in the hub 11 connected to a driving spindle, and a bolt 20 is inserted into the fixing hole, formed on the flange 6 of the sprocket main body 1, to be fixed by a nut 21, thereby reducing a manufacturing procesess, and making a cost inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a sprocket for a rubber crawler.

[0002]

2. Description of the Related Art Conventionally, rubber crawlers have been widely used as traveling parts of agricultural machines, construction machines and civil engineering machines. However, in recent years, rubber crawlers have come to be used for relatively high-speed vehicles, and in this rubber cradle, a metal core is not buried in order to reduce the weight, prevent noise, and eliminate vibration. A structure is used in which projections are continuously formed on the inner peripheral surface thereof, and driving force is transmitted by a sprocket engaging with the projections.

FIG. 7 shows an example of a sprocket used for this type of rubber crawler. In this example, a pair of disks 31 and 32 is provided with a driving pin 33 having both ends and a rubber crawler.
This is an example of driving the projection of the lens. However, recently, in order to prevent fibers such as straw from being wound around the driving pins 33 during use, the driving pins 33 are alternately cantilevered with respect to the pair of disks 31 and 32 as shown in FIG. Sprockets are considered. However, in the case of a sprocket having the double-ended driving pin 33, it is impossible to cast the sprocket because of its complicated structure. Therefore, it is common to manufacture by pressing or welding, which requires a lot of man-hours in manufacturing and lacks mass productivity. Further, even if casting is possible, the casting becomes large, resulting in poor productivity and high cost.

[0004] On the other hand, in the case of a cantilever drive pin 33 sprocket, the root of the drive pin 33 may be bent or broken when a stone or the like is bitten because the pin is cantilevered. Was high. In the case of a sprocket, even if one pin is bent or broken, it is necessary to replace the entire sprocket, which is unavoidable.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the conventional disadvantages by changing the structure of a sprocket having a driving pin.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its structure is such that a driving force is transmitted by engaging with a projection formed on an inner peripheral surface of a rubber crawler. A sprocket for a rubber crawler, characterized in that a sprocket base having the entire circumference of the sprocket uniformly divided in the circumferential direction is fixed to a hub connected to a drive shaft without any gap. is there.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a structure of a sprocket in which the manufacturing cost is high, and the driving pin is replaced due to bending or breakage of the driving pin during use. Rather than being integrally formed by casting, pressing, etc., the sprocket base is manufactured by dividing the whole into equal parts, and by fixing this to the hub, it is relatively inexpensive and easy to manufacture. A sprocket that can be easily handled has been obtained. That is, since the sprocket is a sprocket base that is equally divided, it is possible to form the sprocket relatively inexpensively, not only by press molding or welding, but also by casting. Even if the pin or the like is bent or damaged, it is only necessary to replace the sprocket base at the site of the damage or the like, which greatly contributes to resource saving.

[0008]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a side view of a first embodiment of a sprocket of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a perspective view of a sprocket base, and FIG. 4 is a front view of the sprocket base of FIG. is there.

In the drawing, reference numeral 1 denotes a sprocket base,
The whole sprocket is shaped into four equal parts in the circumferential direction. The sprocket base 1 has a pair of fan-shaped plates 2 and a number of pins 3 erected between the outer edges thereof. A flange 4 is formed on the outer edge of the fan-shaped plate 2 to be in contact with the inner peripheral surface of the rubber crawler. Have been. And fan-shaped plate 2,
An inward fan-shaped inner flange 6 is formed in the bridging portion 5 at the inner edge of 2, and a hole 7 for fixing the hub to the hub is formed in the inner flange 6. The fan plate 2 has a flange 8 around the fan plate 2.
Can be formed in advance.

The hub 11 connected to the drive shaft is provided with a fixing hole 12 on the circumference, and a bolt 20 is formed between the hub 11 and the fixing hole 7 formed in the fan-shaped flange 6 of the sprocket base 1. It is inserted and fixed by the nut 21.

In this example, the sprocket base 1 is
The sprockets are equally divided, and one sprocket is constituted as a whole by fixing the four sprocket bases 1 to the hub 11. The sprocket base 1 may be any one that is equally divided into a plurality of parts other than the above-mentioned four equal parts, and all of them are fixed to the hub 11 to constitute one sprocket.

Therefore, it is sufficient to manufacture a plurality of equally divided small sprocket bases rather than manufacturing the entire sprocket as a single unit, which is characterized in that the number of manufacturing steps is reduced and the cost is reduced.

FIG. 5 is a perspective view of a second embodiment of the sprocket according to the present invention, and FIG. 6 is a front view of the sprocket when the sprocket base 1 is fixed to a hub 11. This sprocket base 1 is an example in which a cantilever drive pin 3 is used.

Then, a sprocket is formed in which the driving pins 3 are alternately opposed to the pair of fan-shaped plates 2 of the sprocket base 1. Therefore, the sprocket base 1 is divided into two parts (a) and (b) on the left and right.
This is an example in which the driving pins 3 are fixed to the hub 11 so as to be alternately arranged. In this example, the inner flanges 6 a and 6 b of the sprocket bases 1 a and 1 b abut from the right and left sides of the hub 11 and are fixed by bolts 20 and nuts 21. In addition, if the inner flanges 6a and 6b are fixed to one side of the hub 11, that is, outside the body, it is suitable for removal such as replacement.

Even in this example, it is only necessary to manufacture a small sprocket base which is divided into a plurality of parts, rather than manufacturing the whole sprocket integrally, which is characterized in that the number of manufacturing steps is reduced and the cost is reduced. However, since the drive pin in this sprocket is cantilevered, it may be necessary to consider that the drive pin may bend from the root in some cases, but in this case, it is necessary to replace only the sprocket base corresponding to the pin. It will be good.

[0016]

According to the present invention, it is only necessary to manufacture a small sprocket base divided into a plurality of parts, rather than manufacturing the entire sprocket as a single body, and the manufacturing steps are reduced and the cost is reduced. It is only necessary to replace the sprocket base due to breakage or the like.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of a sprocket according to the present invention.

FIG. 2 is a front view of the sprocket of FIG. 1;

FIG. 3 is a perspective view of the sprocket base of FIG. 1;

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a side view of a second embodiment of the sprocket of the present invention.

FIG. 6 is a front view when the sprocket base of FIG. 5 is fixed to a hub.

FIG. 7 is a perspective view of a sprocket used for a conventional rubber crawler.

FIG. 8 is a perspective view of another sprocket used for a conventional rubber crawler.

[Explanation of symbols]

 1, 1a, 1b sprocket base, 2 pair of fan plates of sprocket base, 3 drive pins, 4 outer flange, 5 bridging portion of inner edge of fan plate, 6 6a, 6b inner flange, 7mm inner flange fixing hole, 8mm fan plate surrounding flange, 11mm hub, 12mm hub fixing hole.

Claims (1)

[Claims] 1. A sprocket provided with a pin for transmitting a driving force by engaging with a projection formed on an inner peripheral surface of a rubber crawler, the sprocket driving a sprocket base in which the entire circumference of the sprocket is equally divided in the circumferential direction. A sprocket for rubber rollers, which is fixed to a hub connected to a shaft without any gap.