JPH07205850A - Sprocket for single projection drive type rubber crawler - Google Patents

Abstract

PURPOSE:To lengthen the life of a crawler by letting each ring which comes in contact with the inner circumferential surface of a rubber crawler so as to rub it, be rotatable, and thereby prevent the inner circumferential surface of the rubbercrawler and the neighborhood of each rubber projection from being gouged. CONSTITUTION:This invention is concerned with a sprocket composed of a sprocket base body 1 equipped with sprocket teeth 2 over its circumference, and of each ring 3 which is attached on both the side surfaces of the sprocket base body 1, roughly identical in diameter to the sprocket teeth 2, formed with a flange 8 extended to the direction normal to its peripheral end, and is capable of being rotated independently from the sprocket base body 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprocket for driving a single protrusion of a rubber crawler, and more particularly to a sprocket in which interference with a rubber bulge protruding from the inner peripheral surface of the rubber crawler is prevented as much as possible. It is a thing.

[0002]

2. Description of the Related Art Conventionally, among endless track traveling devices used for construction machines, civil engineering machines, agricultural machines, leisure vehicles, snow vehicles, etc., rubber projections are raised at regular intervals on the inner peripheral surface of a rubber crawler. Then, there is a so-called single protrusion drive type in which the rubber protrusion is engaged with the sprocket teeth to give a driving force.

FIG. 8 is a rubber cross section of such a traveling device.
FIG. 9 is a plan view of an inner peripheral side showing an example of the la 40, and FIG. 9 is a side view thereof. In the figure, reference numeral 41 denotes a rubber protrusion formed on the inner peripheral surface of the rubber crawler 40, which is raised from the rubber crawler 40 and is continuously provided in the longitudinal direction of the rubber crawler 40 at regular intervals. Then, the sprocket is sequentially engaged with the rubber protrusion 41 to give a driving force. A rubber lug is continuously provided on the outer peripheral surface side of the rubber crawler 40. In this example, one rubber protrusion 4 is provided.
Rubber lugs 42 ₁ , 4 distributed to the left and right according to ₁ .
2 ₂ are arranged in a pair.

FIG. 10 is a partial side view of the sprocket 50 of the traveling device, and FIG. 11 is a BB line of FIG.
It is sectional drawing in a line. The sprocket 50 has a disc 51 as a sprocket base body and sprocket teeth 52 on its circumference. Flange 53 is formed on both side surfaces of the sprocket tooth 52 to make contact with the inner peripheral surface of the rubber crawler. It is intended to bring about the driving force by friction.
That is, the driving force due to the engagement between the sprocket teeth 52 and the rubber protrusion 41 and the outer surface 54 of the flange portion 53 extending in the direction perpendicular to the sprocket base body 51 sandwiches the inner peripheral surface of the rubber crawler 40, that is, the rubber protrusion 41. Left and right inner peripheral surfaces 43, 43
The outer surface 54 of the flange portion 53 comes into contact with the outer peripheral surface of the flange portion 53, and the driving force provided by the contact friction between the two causes the rubber crawler to rotate and run.

[0005]

Now, the rubber crawler 4
As shown in FIG. 10, the engagement between the rubber protrusion 41 of 0 and the sprocket tooth 52 of the sprocket 50 is ideally the sprocket tooth 52 meshes in the direction of the arrow x toward the base portion 44 of the rubber protrusion 41, as shown in FIG. It comes off in the direction of arrow Y.

However, in reality, the engagement between the sprocket tooth 52 and the rubber protrusion 41 of the rubber crawler 40 rarely takes this ideal locus, and particularly the outside of the flange portion 53 provided at the tip of the sprocket 50. Surface 54 and rubber cross
The frictional drive is applied by contact with the inner peripheral surfaces 43 on both sides of the rubber protrusion 41 of the la 40, and the drive caused by the engagement between the sprocket teeth 52 and the rubber protrusion 41 causes interference. . This is mainly due to the difference in peripheral speed between the two, which causes internal resistance in the rubber crawler 40 and causes heat generation.
The inner peripheral surface 46 of the rubber crawler 40 between the inclined surface 45 and the rubber protrusion 41 is cracked or the like, which causes gouging near the so-called rubber protrusion 41.

The object of the present invention is to engage the sprocket teeth 52 of the sprocket 50 with the rubber projections 41 of the rubber crawler 40, and to contact the outer surface 54 of the flange 53 with the inner peripheral surface 43 of the rubber crawler 40. A sprocket having a special structure is provided to prevent gouging near the rubber protrusion due to friction.

[0008]

In order to achieve the above object, the present invention adopts the following constitution. That is, the features of the present invention are: a sprocket base body having sprocket teeth on the circumference, a sprocket base body having a diameter substantially corresponding to the diameter of the sprocket teeth on both side surfaces, and extending at a right angle to the edge thereof. The present invention relates to a sprocket for a single protrusion drive type rubber crawler, wherein a ring having a flange is additionally provided, and the sprocket base body and the ring can be rotated separately. More specifically, the present invention provides a sprocket in which a stopper for releasing toward an edge is fixed to both side surfaces of a sprocket base, and a ring is attached to the releasing portion.

As the example of the ring, a metal disc-shaped one is usually used, but it may be made of a plastic material having wear resistance and low friction, such as polyethylene resin or It may be made of polyamide resin. Even if the stopper is made of metal or plastic, it is arbitrarily adopted.

[0010]

The feature of the present invention is that the flange portion of the sprocket that contacts the both sides of the rubber protrusion protruding from the inner peripheral surface of the rubber crawler and transmits the driving force by friction is rotatable in the rotational direction of the sprocket. It is a ring with a flange attached. Therefore, the rotation of the ring in contact with the inner peripheral surface of the rubber crawler mainly reduces the friction due to the peripheral speed difference, and prevents gouging in the vicinity of the rubber protrusion. Of course, even when the engagement between the rubber protrusion and the sprocket tooth deviates from the ideal state, the effect is sufficiently exerted, and the sprocket tooth itself is rotatable with respect to the sprocket base body. This effect is particularly great in the case of a shaft-supported one.

[0011]

EXAMPLES The present invention will now be described in more detail based on examples. FIG. 1 is a first embodiment S of the sprocket of the present invention.
_{1 is} a half-cut side view of FIG. 1, and FIG. 2 is an end view taken along the line AA in FIG. In the figure, 1 is a sprocket base,
The sprocket teeth 2, 2 are integrally formed on the circumference with a constant pitch. Rings 3 and 3 having a diameter substantially equal to the diameter of the sprocket base body 1 are additionally provided on both side surfaces of the sprocket base body 1, both of which are rotated by a support member 4 fixed to the side surface of the sprocket base body 1. It is possible to be attached.

That is, as shown in the perspective view of FIG. 3, the support member 4 has its base portion 5 fixed to the side surface of the sprocket base body 1 by a stopper 6, and its tip is outwardly in the radial direction of the sprocket base body 1 and L A step portion 7 having a character shape is formed, and rings 3, 3 are fitted between the step portion 7 of the support member 4 and the sprocket base body 1. The rings 3, 3 are provided with a flange portion 8 whose outer peripheral edge is bent at a right angle.
3 can rotate while being supported by the stepped portion 7.

FIG. 4 shows the sprocket S ₁ and the rubber claw.
FIG. 5 is a side sectional view of a main part showing an engagement state with a la 40, and FIG. 5 is a conceptual diagram of an engagement state with a sprocket S ₁ on an inner peripheral surface side of a rubber crawler. As can be seen from this example, the sprocket teeth 2 are successively engaged with the rubber protrusions 41 of the rubber crawler 40 to transmit the driving force, but the flange portion 8 formed on the edge portion of the rings 3 and 3 is used. The outer peripheral surface 9 also comes into contact with the left and right inner peripheral surfaces 43, 43 sandwiching the rubber protrusion 41, and frictionally drives between the outer peripheral surface 9 of the flange portion 8 and the rubber crawler inner peripheral surface 43. Power is also transmitted. At this time, since the rings 3 and 3 of the present invention have a rotatable structure, the inner peripheral surface 43 of the rubber crawler is
Even if a twisting phenomenon occurs between the rubber and the roller, this force can be released by the rotation of the rings 3 and 3, so that no gouging occurs on the inner peripheral surface of the rubber crawler 40. . In the sprocket S ₁ of the present invention, the outer diameter of the sprocket base body 1 (the diameter of the sprocket teeth 2) and the outer diameter of the ring are the same, but the ring outer diameter may be slightly larger. .

FIG. 6 is an end view of a portion similar to that of FIG. 2 of the second embodiment S ₂ of the sprocket of the present invention. In this example, the sprocket base 1 is two discs, and the pins 10 are provided near the outer peripheral edge portion with a constant pitch. Even in this example, the driving force due to the engagement between the pin 10 and the rubber protrusion 41 of the rubber crawler 40 and the contact friction between the rotatable rings 3 and 3 and the inner peripheral surface 43 of the rubber crawler is generated. It will be transmitted to the rubber crawler.

The pin 10 may be one in which a shaft (not shown) passed between the pin 10 and the sprocket base bodies 1 and 1 passes therethrough so that the pin 10 can rotate. By making the pin 10 engaging with the rubber protrusion 41 rotatable,
The occurrence of gouging will be further reduced.

FIG. 7 shows another example of the supporting body 4 fixed to the side surface of the sprocket base body 1, which is a disk-shaped supporting body 4 in which a step portion 7 is formed at the edge thereof. Yes,
The rings 3 and 3 have the step 7 as in the case of the support 4.
It will be rotatably supported inside.

[0017]

As described above in detail, in the sprocket of the present invention, since the ring of the sprocket that makes friction with the inner peripheral surface of the rubber crawler can be rotated, the inner peripheral surface of the rubber crawler and the rubber crawler can be rotated. No gouging is generated in the vicinity of the protrusion, and the life of the rubber crawler is remarkably improved.

[Brief description of drawings]

FIG. 1 is a first embodiment S _{1 of} a sprocket according to the present invention.
FIG.

2 is a sprocket S ₁ AA of FIG.
It is an end view in a line.

FIG. 3 is a perspective view of a support.

FIG. 4 is a side sectional view of a main part showing an engaged state of a sprocket S ₁ and a rubber crawler.

FIG. 5 is a conceptual diagram of the engagement state with the sprocket S ₁ on the inner peripheral surface side of the rubber crawler.

FIG. 6 is a second embodiment S ₂ of the sprocket of the present invention.
3 is an end view of a portion similar to FIG. 2 in FIG.

FIG. 7 is a perspective view showing another example of a support.

FIG. 8 is a plan view of an inner peripheral side showing an example of a rubber crawler.

FIG. 9 is a side view of the rubber crawler of FIG.

FIG. 10 is a partial side view of a sprocket.

11 is a cross-sectional view of the sprocket of FIG. 10 taken along the line BB.

[Explanation of symbols]

S ₁ , S ₂ ...... Sprocket of the present invention, 1 sprocket base, 2 sprocket teeth, 3 ring, 4 support material, 5 base material of support material, 6 stopper, 7 ... L-shaped step of the support material, 8 ... flange of the outer peripheral edge of the ring, 9 ... outer peripheral surface of the flange of the ring, 10 ... pin, 11 ... passed between the sprocket bases Shaft, 40 ... rubber crawler, 41 ... rubber claw rubber projection, 42 ₁ , 42 ₂ ... rubber lug, 43 ... inner circumference of rubber crawler sandwiching rubber projection, 44 ... rubber projection Base portion, 45 ... Inclined surface of rubber projections, 46 ... Inner peripheral surface of rubber crawler between rubber projections, 50 ... Sprocket, 51 ... Sprocket base, 52 ... Sprocket teeth, 53 ... Flange, 54 ... External surface of flange.

Claims (2)

[Claims] 1. A sprocket base body having sprocket teeth on its circumference, and flanges having diameters substantially corresponding to the diameters of the sprocket teeth and extending at right angles to their edges are formed on both side surfaces of the sprocket base body. A sprocket for a single-protrusion drive type rubber crawler characterized in that the sprocket base body and the ring are separately rotatable. 2. A sprocket for a single protrusion drive type rubber crawler according to claim 1, wherein stoppers for releasing toward the edge are fixed to both side surfaces of the sprocket base, and rings are attached to the releasing portions.