JPS62253567A - Elastic track shoe for track - Google Patents

Abstract

PURPOSE:To facilitate the replacement from an iron track link by making the elastic shoe from the plastic material such as urethane having a certain strength. CONSTITUTION:An elastic track link 3 is constituted of a track shoe 30 as main part, lug 31 formed on the outer peripheral surface side, and wheel guide projections 32 formed on the inner peripheral surface side. At the center part between the wheel guide projections 32 and 32 arranged in parallel, window holes 33 for fitting the teeth of the sprocket wheel in vertically penetrating manner are formed in a constant pitch. The elastic track link 3 is made of the plastic material such as urethane, etc. which possesses certain strength for both compression and tension.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in elastic tracks used in tracked wheels of tractors, civil engineering vehicles, etc., in place of iron tracks attached thereto.

Tracked wheel type (crawler type) vehicles usually use iron tracks for their tracked wheels.

Vehicles equipped with tracks using iron tracks will damage the road surface when driving on paved roads, so in that case, the steel tracks should be removed from the tracks and replaced with a plastic material such as rubber. The shoes are replaced with molded elastic tracks and run in the form of a so-called rubber crawler, but changing with this elastic track requires not only replacing the tracks, but also changing the guide wheels and drive wheels of the track wheels. It is necessary to completely replace the wheels, which poses a problem in that changing the wheels takes time and effort.

The present invention has been made to solve this problem, and is installed in place of iron tracks without replacing the guide wheel drive wheels and rollers of tracked wheels using iron tracks. An object of the present invention is to provide an elastic crawler track for use in a tracked wheel that can be used for a tracked wheel.

Therefore, the present invention was completed based on knowledge obtained through various studies to solve the above-mentioned problems. In other words, when removing a steel track from a track width equipped with a steel track and replacing it with a rubber elastic track, the guide wheels, drive wheels, and rollers must be replaced with the rubber elastic track. The shape of the guide part, which becomes the tread surface of the rolling wheels and guide wheels formed in This is due to the fact that the rubber elastic crawler tracks have the same shape as the guide and meshing parts of the steel tracks, so there is no need to replace the drive wheels, guide wheels, rolling wheels, etc. However, I will be able to change my shoes to elastic tracks made of rubber.

Is that like that?91? When I formed the
The core metal, which is buried at a certain interval inside the elastic crawler track, and the plastic material made of an elastic material such as rubber that is used to mold the elastic crawler track may separate, and the core metal may come out from the molded plastic material. As a result, we were unable to obtain anything that could be put to practical use.

Therefore, after considering rubber elastic tracks and iron tracks, in the case of the iron tracks 1, as shown in FIGS. The bushings 12, which are fitted into the..., become the meshing parts that engage with the southern part of the sprocket 13, which is the drive wheel with track width A, and the inner circumferential surfaces 10a of the links 10...
... constitutes a guide portion that becomes the tread of the rolling wheels 14 and guide wheels, and the center line W of the rotation locus of the iron crawler track 1 is the link 1
This is the rotation locus of the connecting pin 11... that connects the o..., and from this, the shoe plate 15... that comes into contact with the ground is aligned with this rotation center line W. outside.

The inner periphery of the link 1°... which rotates while expanding and contracting its continuous length in the rotation direction by bending by the connecting pin 11... of the link IO... The surface 10a... is the connecting pin 11 of the link 1o...
It was found that by bending due to ..., it rotates while expanding and contracting the continuous length in the rotation direction.

On the other hand, in the case of the elastic crawler track 2 made of rubber.

As shown in FIGS. 3 and 4 and 5,
In the crawler track 2o, the core metals 21 are arranged and embedded at a constant pitch in the crawler track 20, which is made of a plastic material made of an elastic material such as rubber or synthetic resin and is molded to be continuous endlessly. The part exposed through the window hole 22 that has been formed becomes a meshing part that engages with the southern part of the sprocket 23 that is the driving wheel, and the inner circumferential surface of the crawler track 20 becomes a guide part that becomes the tread surface of the rolling wheel 24 and guide wheel. It is designed to rotate.

Then, the center line of the rotation locus at that time is the core bar 21...
This is supposed to be the rotation locus of the part exposed in the window hole 22, but in reality, the core metal 21... is buried and the crawler track 2 is made of plastic material.
0, in order to prevent the elongation of the rotating force of the track 20, a steel cord (piano wire) 25 is placed on the bottom surface of the core bar 21. , the position where the steel cords 25, . . . are buried is the center line W of the rotation locus. 1 From this, in order to make the meshing part of the elastic crawler track 2 the same shape as the meshing part of the iron crawler track l, for example, the exposed part of the core metal 21 is formed in the area shown by the chain line in FIG. Core metal 21... so that the inner peripheral surface of metal 21... becomes the road surface of the rolling wheel 249 guide wheel.
When the inner peripheral side of the elastic track 2 is extended to have the same shape as the guide part of the iron crawler track 1, the meshing part and the guide part formed on the core bar 21... Due to the large deviation from the inner circumferential side, the part inside the center line W of the crawler track 20 made of an elastic material rotates at a rotation radius smaller than the center line W, and due to repeated contraction in the rotation direction,
It was found that the core metal 21... was squeezed out from the elastic material of the crawler track 20, making it unusable. As shown by solid lines in FIG.
Each exposed portion of... is installed in a position extremely close to the steel cord 25 buried within the crawler track 20, and a guide portion is formed on the inner circumferential surface of the crawler track 20 close to the steel cord 25. However, it was found that the sprocket 23, rolling wheels 24, guide wheels, etc. had to be formed to correspond to this.

Therefore, after further investigation, we found that the above-mentioned constraint that the elastic crawler track 2 must be formed into a different form from the iron crawler l is due to the compression of the elastic crawler track 20 when forming it from a plastic material. This is due to the core metal 21... and the steel cord 25... which are embedded integrally inside to reinforce the strength and tensile strength.This reinforcement is performed by other means, and the core metal 21... If the steel cord 25... is not buried inside the crawler track 2o, the above-mentioned restrictions can be solved.

Having realized that the elastic crawler track 2 can be molded into any shape, the crawler track 20, which is made of a plastic material made of an elastic material such as rubber, is reinforced against compression and tension. This is achieved by using friction-resistant urethane (urethane elastomer) and the strength of the plastic material itself, and by using that malleable material, the shape of the meshing part and guide part can be made of iron without burying the core bar or steel cord. By molding an elastic track that has the same shape as the meshing part and guide part of the track l, it is easy to replace the iron track with the tracked wheel without having to replace the drive wheel, rolling wheel Φ guide wheel, etc. This is due to the fact that it has been found that it can be used for a long time and has sufficient durability.

For this reason, in the present invention, as a means to achieve the above-mentioned object, an OT plastic material such as urethane having strength against compression and tension is used to mesh the iron crawler of the tracked wheel equipped with the iron crawler. This invention proposes an elastic crawler track for use in tracked wheels, characterized in that the crawler track is equipped with an engaging part and an engaging part having the same shape as the guide part and the engaging part, and is formed without embedding a core metal or steel cord inside. be.

Next, an example of implementation will be described in detail with reference to the drawings.

FIG. 6 is an explanatory side view of a tracked wheel in which the present invention can be implemented, and in the figure, 3 is an elastic track according to the present invention;
3 shows a sprocket, 14 shows a rolling wheel, and FIG.
30 is a crawler which is the main part of the elastic crawler 3; 31 is the crawler 3;
The lug formed on the outer circumferential surface of the crawler track 30, 32@32 indicates a derailment prevention protrusion formed on the inner circumferential surface of the crawler track 30 to prevent the rolling wheels l4 and guide wheels of the track wheels from coming off. There is. Also, crawler track 30
As shown in FIG.
jJl of sprocket 13 of the track wheel by penetrating it up and down.
Window holes 33 into which the sprockets 13a are inserted are provided at a constant pitch, and within the pitch of the window holes 33 are meshing holes that mesh with the teeth 13a of the sprocket 13. Teeth 34 are formed.

Therefore, the crawler track 20 uses urethane (urethane elastomer) as a plastic material, and the lugs 31...・It is integrally molded with a shape that includes a derailment prevention protrusion 32, a window hole 33, and so on. During molding, the derailment prevention protrusions 32 are made long. The inner circumferential end surface 32a of the protrusion is formed so as to be continuous in the direction of the iron track wheel A equipped with the iron crawler track 1 shown in FIGS. 1 and 2. The tread surface Y is formed to have the same shape as the tread surface Y formed by the inner circumferential surfaces 10a of the links 10 of the crawler track 1, so that the guide section formed by the tread surface Y is It is designed to have the same shape as the guide part of the iron crawler track l. Further, the meshing teeth 34 provided to mesh with the teeth 13a of the sprocket 13 described above are the links l of the iron crawler track l described above.
They are formed in parallel at a pitch corresponding to the pitch of the connecting pins 11 .
The portion on the inner end side (upper end side in FIG. 7) of the sprocket 13 that fits into the valley 13b between the teeth 13a of the sprocket 13 and contacts the outer surface of the sprocket 13a is made of iron. It is formed into an arcuate surface 34a corresponding to the outer peripheral surface of the bushing 12 on the outer periphery of the connecting pin 11 of the crawler track l, so that the meshing part formed on the inner end side of the meshing part 34 can be connected to the iron crawler track 1.
It is formed to have the same shape as the engaging part of the iron crawler track l formed by the circumferential surface of the bushing 12 that fits on the outer circumference of the connecting bin 11.

The elastic crawler belt 3 constructed in this manner operates as follows.

As shown in FIG. 1, when the elastic crawler 3 is installed in place of the iron crawler l on a tracked wheel A equipped with the iron crawler 1, the meshing part and guide part of the elastic crawler 3 are 1
Since it is formed in the same shape as the engaging part and guide part of
Without removing the track wheels 14, sprockets 13, guide wheels, etc. from the track wheels A, it becomes possible to replace them with the iron crawler tracks 1.

When the elastic crawler belt 3 is attached to the tracked wheel A and rotates by the drive of the sprocket 13, the core metal 21, steel cord 25, etc., which were buried inside the previous elastic crawler belt 2, are placed inside the elastic crawler belt 3. Since the compressive strength and tensile strength are maintained by the strength of the plastic material itself, the center line of the rotation locus is located at the center in the thickness direction of the plastic material forming the elastic crawler track 3. , and its center is the elastic crawler track 3
can be set as desired by adjusting the wall thickness of each part when molding, and by increasing the wall thickness in the width direction of the protrusions 32 and 32 to prevent derailment, the inner end surface of the meshing teeth 34 forming the meshing part can be set as desired. Since the center line of the rotation locus can be positioned at the same position, when the sprocket 13 is driven to rotate, the meshing part moves in the rotation direction by the elasticity of the plastic material forming the elastic crawler track 3, and the tracked wheel As explained above, the elastic crawler used for the tracked wheels according to the present invention is made of a plastic material such as urethane that has strength against compression and tension, and is made of a steel crawler. A belly belt having a meshing part and a meshing part having the same shape as the meshing part and a guide part of the iron crawler track of the equipped track wheel is formed by molding without embedding a core metal and a steel cord inside. Therefore, when replacing a tracked wheel equipped with a steel crawler track with an iron belt, you can replace it without having to replace the guide wheels, rollers, sprockets, etc. of the tracked wheel. You can now perform the work, and you can freely set the center line of the rotation locus without being restricted by steel cords, and the replaced elastic tracks can be used to prevent unstable running of the track wheels. In addition, it should be suitable for practical use and durable so that it will not be easily damaged by use.

[Brief explanation of drawings]

Figure 1 is an explanatory side view of a mounting wheel equipped with iron tracks, Figure 2 is a longitudinal sectional front view of the main parts of the same, and Figure 3 is a side view of a mounting wheel equipped with an elastic track. Figure 4 is a longitudinal sectional front view of the main part of the same H, Fig. 5 is a longitudinal sectional front view of the main part on the side where the above roller is used as an outer roller, and Fig. 6 is a track arrangement that can implement the present invention. An explanatory diagram of the wheel as seen from the side, FIG. 7 is a longitudinal sectional front view of the main parts of the same vehicle, FIG. 8 is an enlarged longitudinal sectional top view of the elastic crawler of the same vehicle, and FIG. 9 is a longitudinal sectional side view of the same vehicle. FIG. 10 is a plan view of the same. Explanation of drawing symbols A...Track wheel W...Center line Y...Treadwork...Iron crawler track 10...Link LOa...
・Inner peripheral surface 11... Connecting bottle 12... Bush
13... Sprocket 13a... Teeth 13b.
... Valley section 14 ... Rolling wheel 15 ... Shoe plate 2 ... Elastic crawler belt 20 ... Crawler track 21 ... Core metal 22 ... Window hole 23 ... Sprocket 2
4...Rolling wheel 25...Steel coat (piano wire) 3
...Elastic crawler track 30...Crawler track 31...Lug 32...Rail slippage prevention protrusion 32a...End face 33.
...Window hole 34...Meshing tooth 34a...When arced Applicant /\Dozer Kogyo Co., Ltd., 1
・Cannon・1.・' 2nd interval iml 61st 5g 7th FI! J1 Otsu

Claims (1)

[Claims] Made of a plastic material such as urethane that has strength against compression and tension, the track is equipped with a core inside the track that has the same shape as the meshing part and guide part of the steel track of the tracked wheel equipped with the steel track. An elastic crawler track used for track wheels characterized by molding gold and steel cords without embedding them.