JPH02204182A - Prevention of slip-off of elastic belt in caterpillar vehicle and device therefor - Google Patents

Abstract

PURPOSE:To surely prevent the slip-off of an elastic belt by installing a guide arm whose top edge is urged towards the inner peripheral surface of the elastic belt onto a frame in the vicinity of an ilder and absorbing the slack of the elastic belt by the swing drive of the guide arm. CONSTITUTION:An elastic endless belt 14 is laid around a sprocket 12 and an idler 13 arranged at the both edges in the lengthwise direction of a frame 11 formed integrally with a caterpillar vehicle and around a plurality of rollers 11a arranged above and below the frame 11, and a slip-off preventing device 15 is installed in the vicinity of the idler 13. The slip-off preventing device 15 is constituted from a supporting part 16 which has a nearly U-shaped section and is formed from a back plate 16c and side plates 16a and 16b which are set oppositely, keeping a certain interval, guide arm 18 whose one edge is axially supported 17 onto the supporting part 16, and an elastic body 22 which is interposed between the curved part 20 of the guide arm 18 and the back plate 16c and urges the guide arm 18 downward.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for preventing derailment of elastic tracks in tracked vehicles such as various civil engineering and construction machines such as bulldozers and power shovels, or agricultural vehicles such as tractors, and Regarding the device.

(Prior Art) Tracks used for running tracked vehicles usually have an iron structure in which a large number of links and tracks are endlessly connected to each other via bushes and pins. When driving on a paved road surface, in order to prevent scratches on the road surface, it is common practice to wear so-called elastic belts made of a plastic material such as rubber or urethane.

Furthermore, as shown in FIGS. 6 and 7, the elastic crawler track is centered around a frame 1 that is integrated with the tracked vehicle, and includes idlers 2 and sprockets (not shown) that are disposed oppositely on both sides of the frame 1 in the length direction, and The upper roller wheel (not shown) arranged on the upper side of the frame 1 and the lower roller wheel (not shown) arranged on the lower side of the frame 1
5), and is attached to the frame 1 at a position relatively close to the idler 2 and the sprocket, and is fitted with a fixed guide plate 3 made of iron and protruding in the direction of the inner circumferential surface of the elastic layer band 4. This reduces the possibility of the elastic track coming off the sprocket or idler during running.

(Problem B to be Solved by the Invention) The presence of the fixed guide plate described above can be expected to have a certain degree of effect in reducing the occurrence of the elastic layer band coming off the idler or sprocket when traveling straight on flat ground and turning.

However, it is not possible to reduce sudden turns on slopes or derailment when driving on rough roads.

This is because when the road surface is sloping, as shown in FIG. 8, the fixed guide is This is because the protruding length of the plate 3 must be kept modest.

Moreover, if the elastic crawler track 4 is inclined, the sprocket will easily get over the surface that contacts the inner circumferential roller 5, and the risk of the wheel coming off is still unresolved.

Therefore, when operating a tracked vehicle equipped with an elastic crawler track having the above-mentioned structure, it is necessary to take great care and there are also problems in terms of workability.

(Means for Solving the Problems) The present invention solves the problems in the prior art described above, and makes it possible to more reliably prevent the elastic layer band from coming off when the tracked vehicle runs. Specifically, the system is centered around a frame that is integrated with the tracked vehicle, with idlers and sprockets installed opposite to each other on both sides of the frame in the longitudinal direction, and between wheels installed on the upper and lower sides of the frame. An endless elastic crawler track, in which slack of the elastic track is absorbed by a guide arm whose tip is biased toward the inner circumferential surface of the elastic track from at least one end of the frame that approaches the idler or sprocket. The present invention relates to a method for preventing derailment of an elastic crawler track in a tracked vehicle, characterized by:

The present invention also provides a frame integrated with a tracked vehicle, an idler and a sprocket provided oppositely on both sides in the longitudinal direction of the frame, wheels provided on the upper and lower sides of the frame, and the wheels and the sprocket provided on the upper and lower sides of the frame. An endless elastic crawler belt that is wound around between the idler and the sprocket, and a tip of the elastic crawler belt that is located at least one of the ends of the frame and close to the idler and the sprocket, and has a tip facing toward the inner circumferential side of the elastic layer band. The present invention also relates to a device for preventing derailment of an elastic crawler track in a tracked vehicle, which includes a guide arm that is constantly energized.

(Function) When a tracked vehicle runs with a guide arm that is constantly biased toward the inner peripheral surface of the elastic crawler track, if the elastic track becomes slack on a sloping road surface or rough running ground, the guide arm is activated. It absorbs this and prevents the elastic track from coming off the sprocket or idler.

(Example) The specific content of the present invention will be explained below based on the example shown in FIGS. 1 to 5.

In the figure, 11 is a frame integrated with the tracked vehicle, 12
13 is a sprocket disposed on one side in the length direction of the frame 11, an idler 13 is disposed opposite to the sprocket 12 on the other side in the length direction of the frame 11, and 14 is a sprocket disposed on the upper and lower sides of the frame 11. The rollers 11a and the endless elastic tracks 15 are wound around the idler 13 and the sprocket 12, respectively, and 15 indicates a derailment prevention device.

The elastic crawler track 14 is formed by integrally molding an elastic plastic material such as rubber or urethane into an endless shape using a mold.

As shown in FIGS. 4 and 5, the derailment prevention device 15 includes side plates 16a and 16 that are arranged opposite to each other at a constant distance.
a support portion 16 having a substantially U-shaped cross section formed by b and a back plate 16C, a guide arm 18 interposed between the side plates 16a and 16b with one end rotatably attached to the shaft, and a side plate 16a, 1
It is composed of an elastic body interposed near the pivot position of the guide arm 18 described above between 6b.

The support portion 16 has a stopper plate 16d that is continuous with the back plate 16C and is bent approximately at right angles to close the rear openings of the side plates 16a and 16b.

The guide arm 18 has a shape as shown in FIG.
It has a shaft hole 19 at its base end, through which the shaft F is inserted and rotatably supported between the side plates 16a and 16b, and a protrusion 1111a is formed approximately in the center of the upper part, and this protrusion 18a A curved portion 20 is formed which is recessed inward toward the shaft hole 19.

Further, a flat rear surface portion 18b is formed on the rear surface near the shaft hole 19 to be brought into contact with the stopper plate 16d of the support portion 16, and a guide arm 21 is integrally welded from approximately the middle of the guide arm 18.

The elastic body 22 is made of a material with high elasticity and restoring force, such as rubber or soft urethane, and is interposed between the curved part 20 of the guide arm 18 and the back plate 16c in the support part 16. As a result, the guide arm I
8 with the shaft 17 as the fulcrum, always downward (in the direction in which the rear surface portion 18b of the guide arm I8 abuts the stopper plate 16d),
That is, it is urged toward the solid line position in FIG.

The above-mentioned support part is fixed to at least one of the lower sides of the frame II at a position close to the idler 13 and the sprocket 12 with a fixing means such as a bolt, and the tip of the guide arm 18 is attached to the elastic crawler track 14. Press it against the inner circumferential side (see Figures 1 and 2).

However, if the elastic track 14 becomes slack while the tracked vehicle is running, the tip of the guide arm 18 will rotate downward about the axis I7 due to the elasticity of the elastic body 22, and the tip will move inside the elastic track 14. It follows the circumferential surface and absorbs slack (see Figure 3).

In the embodiment described above, a case has been described in which the elastic body 22 is interposed as a biasing means for the guide arm 18, but the guide arm 18 is not necessarily limited to this, and other biasing means such as a spring or an oil damper may be used for guiding The tip of the arm may be brought into constant pressure contact with the inner circumferential surface of the elastic track.

(Effects of the Invention) As described above, the present invention has a guide arm whose tip end is urged toward the inner circumferential surface of the elastic track from at least one end of the frame that approaches the idler or sprocket to absorb the slack of the elastic belt. Because it was made in
When running a tracked vehicle equipped with elastic tracks, there is no risk of the elastic tracks coming off when making sharp turns on slopes or running on rough roads, and work efficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an endless track device equipped with a derailment prevention device for an elastic crawler track according to an embodiment of the present invention, and FIG. Figure 3 is a side view for explaining the action of the guide arm when the elastic track is relaxed in Figure 2, Figure 4 is an enlarged side view with one side plate of the derailment prevention device cut away, and Figure 5. Figure 6 is a partial cross-sectional view of a conventional endless track system equipped with an elastic crawler track, and Figure 7 is a cross-section of the elastic track shown in Figure 6. FIG. 8 is a sectional view showing the inclined state of the elastic crawler belt of FIG. 6 when running on a slope. 11... Frame I3... Idler 15... Roll-off prevention device 1.6a, 16b... Side plate 1.6d... Stopper plate 18... Guide arm 12... Sprocket 14... Elastic crawler track 16... Support portion 16c... Back plate 17...・Shaft 18a... Protruding portion 18b... Rear surface portion 20... Curved portion 22... Elastic body I9... Shaft hole 21...・・・Metal bar inventor: same person

Claims (2)

[Claims] (1) An endless frame centered on a frame integrated with the tracked vehicle, with idlers and sprockets installed opposite to each other on both sides in the length direction of the frame, and between wheels installed on the upper and lower sides of the frame. The elastic crawler is adapted to absorb the slack of the elastic crawler by a guide arm whose tip is urged toward the inner circumferential surface of the elastic crawler from at least one end of the frame that approaches the idler or sprocket. A method for preventing derailment of an elastic crawler track in a tracked vehicle, characterized by: (2) a frame integrated with the tracked vehicle, an idler and a sprocket provided oppositely on both sides in the length direction of the frame, and wheels provided on the upper and lower sides of the frame;
An endless elastic crawler belt that extends between the wheels, the idler, and the sprocket, and a tip end inside the elastic crawler belt on at least one of both ends of the frame close to the idler and sprocket. A derailment prevention device for an elastic crawler track in a tracked vehicle, comprising a guide arm that is constantly biased toward the circumferential side.