JP2006062391A - Rubber crawler traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber crawler traveling device capable of increasing thickness of rubber on an inner surface of a rubber crawler which a ring body makes contact with and rolls on by the amount of a difference in height between the outer surface of the ring body of a sprocket and an engaging part (pin), by structuring the outer surface of the engaging part (pin) so that it projects in the diametrical direction from the outer surface of the ring body of the sprocket, eliminating nonconformity in engagement, improving durability of the rubber crawler, and reducing vibration, etc. <P>SOLUTION: This rubber crawler traveling device is constituted of a sprocket made of a pair of the cylindrical ring bodies 11, 12 and the engaging part bridged between them and the rubber crawler furnished with a rubber projection formed with a rubber lug on the outer peripheral side and a constant pitch on the inner peripheral side, the outer surfaces of the ring bodies 11, 12 make contact with the left and right rubber crawler inner peripheral surfaces of the rubber projection , driving force is transmitted as the pin is engaged with the rubber projection and an outer surface 13a of the engaging part is projected in the diametrical direction more than the outer surfaces of the ring bodies 11, 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a travel device for a cored bar-less crawler that travels by pin driving.

  Rubber crawlers have heretofore been widely used in agricultural equipment, construction machinery, civil engineering machines, etc., but in recent years, they have also been adopted in vehicles that are used for relatively high-speed traveling. The rubber crawler used at such a high speed has a structure called a so-called coreless rubber crawler, and does not embed a cored bar inside, and its driving force is transmitted to the inner peripheral side of the rubber crawler. A pin-type sprocket is engaged with the rubber protrusions.

  FIG. 1 is a conceptual view from the side of a pin-type sprocket used therein, and FIG. 2 is a front view showing a meshed state with a rubber crawler. Reference numeral 10 denotes a pin-type sprocket, which is composed of a pair of cylindrical rings 11 and 12 and a meshing portion (represented by a pin) 13 bridged between them with the same pitch as the pitch of the rubber protrusions. The outer surface of the pin 13 is configured so as to be the same surface as the outer surfaces 11a and 12a of the rings 11 and 12 or inside thereof. In the figure, the outer surface of the pin 13 and the outer surfaces 11a and 12a of the rings 11 and 12 are the same surface.

  On the other hand, the rubber crawler 20 is continuous on the front and back of the paper surface of FIG. 2. A steel cord row 21 is embedded in the center, a rubber lug 22 on the outer peripheral side, and a constant pitch on the inner peripheral side. A rubber protrusion 23 is formed. The steel cord row 21 is a reinforcing member that resists the tensile force applied to the rubber crawler. The driving force and external force applied to the rubber crawler are received by the steel cord row 21 as a rubber crawler. The rubber on the inner peripheral side from the steel code row 21 receives a compressive force, and the rubber on the outer peripheral side is stretched. Configure.

  When the sprocket 10 and the rubber crawler 20 are engaged with each other, the outer surfaces 11a and 12a of the rings 11 and 12 of the sprocket 10 are formed on the left and right inner peripheral surfaces 20a and 20b of the rubber protrusions 23 of the rubber crawler 20. The pins 13 come into contact with each other, and the pin 13 is engaged with the rubber protrusion 23 to transmit the driving force.

  The inner peripheral surfaces 20a and 20b of the rubber crawler 20 with which the outer surfaces 11a and 12a of the rings 11 and 12 of the sprocket 10 come into contact are not only in contact, but also the weight of the fuselage is large when an external force is applied. This is where the compressive force and shear force always work.

  Therefore, it is better to increase the thickness of the rubber on the inner peripheral surfaces 20a and 20b as much as possible. In addition, when the thickness of the rubber at this portion is thin, vibration transmission to the occupant is also increased.

  However, as the rubber thickness of the inner peripheral surfaces 20a and 20b is increased, the degree of meshing between the rubber protrusions 23 and the pins 13 is reduced accordingly, and in some cases, a skipping phenomenon occurs. Further, since the steel code row 21 serves as a center plane for the tensile force, the driving force is preferably transmitted as close to the steel code row 21 as possible. On the contrary, there is also a problem that the steel code row 21 is engaged at a distance.

  The present invention has been made in view of the above prior art, and the gist of the present invention is a sprocket including a pair of cylindrical rings and a meshing portion represented by a pin or the like bridged between them, and an outer periphery. A rubber lug provided with rubber lugs on the side and rubber protrusions formed with a constant pitch on the inner peripheral side, and the outer surface of the ring body is in contact with the inner peripheral surfaces of the left and right rubber crawlers of the rubber protrusions, A rubber crawler traveling device in which a meshing portion meshes with a rubber protrusion and a driving force is transmitted, wherein the outer surface of the meshing portion protrudes in a radial direction from the outer surface of a ring body. .

  The present invention is as described above, and has a structure in which the outer surface of the meshing portion (pin) protrudes in the radial direction with respect to the outer surface of the sprocket wheel. Therefore, the rubber thickness on the inner surface of the rubber crawler where the ring contacts and rolls can be increased by the difference between the outer surfaces of both the rubber crawlers. A rubber crawler having great features such as improved durability of the rubber and reduction of vibrations was obtained.

  FIG. 3 shows a state in which the conventional sprocket 10 shown in FIG. 1 is engaged with a rubber crawler having an increased inner surface rubber thickness 20a, 20b on which the rings 11 and 12 contact and roll. However, the meshing between the two becomes shallower by the increased thickness (T), and the meshing position is further away from the steel code row 21 by that amount.

  In the present invention, specifically, the structure in which the pin 13 is protruded in the radial direction by the thickness (T) described above returns this to the original state, and if further protruded, a deeper meshing state is obtained. Will be obtained.

  In the foregoing, the description has been given mainly with the pin as the meshing portion, but it may be fixed or rotatable, and may be gear-shaped.

Hereinafter, it demonstrates still in detail with an Example.
4 is a side view of the pin-type sprocket 10 used in the present invention, and FIG. 5 is a front view thereof. That is, the outer surface 13a of the pin 13 which is a meshing portion protrudes (T0) from the outer surfaces 11a and 12a of the rings 11 and 12 of the sprocket 10.

  FIG. 6 shows the structure of the rubber crawler 20, in which a steel cord row 21 is embedded in the center, a rubber lug 22 on the outer peripheral side, and a rubber protrusion 23 with a constant pitch in the center on the inner peripheral side. Is formed. And the part of surface 20a, 20b which outer surface 11a, 12a of the ring bodies 11 and 12 of an inner peripheral side contacts and rolls is formed thickly by T.

  FIG. 7 is a view showing a state in which the two are engaged with each other. As can be seen from this drawing, the position of the pin 13 is arranged on the outer side by the thickness T of the inner peripheral surfaces 20a and 20b (T = T0). As a result, the original meshing is restored, and further, when T <T0, the meshing becomes deeper and the steel code row 21 is approached.

  FIG. 8 is a side view showing another example of the pin-type sprocket 10 used in the present invention. That is, the outer surface 13a of the gear shape 13 which is a meshing portion is protruded from the outer surfaces 11a and 12a of the rings 11 and 12 of the sprocket 10, and has the same effect as the pin 13 described above.

  The present invention is as described above, and can be applied to all rubber crawlers used for high-speed running, and the effect is extremely large.

FIG. 1 is a side view of a conventional pin type sprocket. FIG. 2 is a front view showing a state where the sprocket of FIG. 1 is engaged with a rubber track. FIG. 3 is a front view showing a meshed state between the sprocket of FIG. 1 and the improved rubber track. FIG. 4 is a side view of a pin-type sprocket used in the present invention. FIG. 5 is a front view of the sprocket of FIG. FIG. 6 is a cross-sectional view showing the structure of the rubber track of the present invention. 7 is a cross-sectional view showing a state where the sprocket shown in FIG. 4 and the rubber track shown in FIG. 6 are engaged. FIG. 8 is a side view showing another example of the sprocket used in the present invention.

Explanation of symbols

10. Sprocket,
11, 12 ...
11a, 12a ... the outer surface of the ring,
13 ... meshing part,
13a ... the outer surface of the meshing part,
20. Rubber crawler,
20a, 20b ... the inner peripheral surface of the rubber track,
21 ... Steel code train,
22. Rubber rug,
23 ... rubber protrusion,
T: Increase in thickness of rubber track,
T0: Protruding portion of the meshing part.

Claims (2)

  A sprocket composed of a pair of cylindrical rings and a meshing portion bridged between them, and a rubber crawler provided with rubber lugs on the outer peripheral side and rubber protrusions formed with a constant pitch on the inner peripheral side, A rubber crawler traveling device in which the outer surface of the ring body is in contact with the inner peripheral surfaces of the left and right rubber crawlers of the rubber protrusion, and the pin is engaged with the rubber protrusion and the driving force is transmitted. A rubber crawler travel device characterized by projecting in a radial direction from the outer surface of a ring body.   2. The rubber crawler according to claim 1, wherein the rubber crawler has a structure in which the base of the rubber projection and the inner peripheral surfaces of the left and right rubber crawlers of the rubber projection are close to the steel cord row. Traveling device.

Images