KR100558101B1 - Crawler equipment for construction machine - Google Patents

Abstract

The present invention improves the ride comfort, and improves the durability of the rubber transmission parts and front wheel tire parts of the rubber crawler belt, and at the same time, prevents the crawler belt from shifting sideways or coming off from the uneven road surface. An object of the present invention is to provide a crawler traveling device.

In the crawler belt body 2 made of an elastic material, the mandrel 4 having a pair of left and right guide protrusions 3 and 3 protruding inwardly in the center portion in the width direction is embedded at predetermined intervals in the longitudinal direction, and guide protrusions are provided. The roller crawler belt (1) having a pair of rubber transmission parts (5, 5) formed on the inner and outer sides of the crawler belt and the rubber transmission parts (5, 5) on the outer side in the width direction of (3, 3). In the crawler traveling device provided with the front wheels 20, the front wheels 20 are formed at the outer periphery of the boss 21, the central flange 24 formed at the center portion in the width direction of the boss 21, and both ends of the boss 21. In addition to the annular tires 25 and 25 of the mounted elastic material, a predetermined gap a1 between the widthwise side surface of the center flange 24 and the inner surface of the guide protrusions 3 and 3 is provided. It was made smaller than the predetermined clearance b between the inner surface of 25) and the outer surface of the guide protrusions 3 and 3.

Description

Crawler traveling device {CRAWLER EQUIPMENT FOR CONSTRUCTION MACHINE}

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows an example of the work vehicle to which the crawler traveling apparatus which concerns on this invention is applied.

2 is a cross-sectional view showing a first embodiment of a crawler traveling device according to the present invention.

3 is a cross-sectional view showing a second embodiment of a crawler traveling device according to the present invention.

4 is an attached view of the guide body in FIGS. 1 to 3.

Fig. 5 is a partial sectional view showing a third embodiment of a crawler traveling device according to the present invention.

Fig. 6 is a partial sectional view showing a fourth embodiment of a crawler traveling device according to the present invention.

7 is a cross-sectional view of a conventional crawler traveling device.

<Explanation of symbols for main parts of drawing>

1: rubber crawler belt

2: body

3, 3A: guide protrusion

4: mandrel

5: rubber transmission part

10: crawler frame

11: guide body

12: shaft

20, 20A: front wheel

21, 21A: Boss

22: bearing

23: thrust plate

24: center flange

25, 25A: tire

26: Rim

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device for use in a crawler mounted vehicle such as a crawler dump or a hydraulic shovel. In particular, the present invention relates to a crawler traveling device that improves durability of a front wheel and a rubber crawler belt. It is about.

Conventionally, the rubber crawler traveling apparatus using the rubber crawler belt is employ | adopted for the purpose of improving riding comfort and reducing running noise. As shown in FIG. 7, the conventional rubber crawler traveling device includes a mandrel 34 having a pair of guide protrusions 33 and 33 at the center in a crawler belt body 32 made of an elastic material such as rubber. At a predetermined interval in the longitudinal direction of the crawler belt and at the center of the width direction of the crawler belt, the guide protrusions 33 and 33 are embedded toward the inner circumferential side of the crawler belt, and the outside of the guide protrusions 33 and 33 in the width direction. The rubber crawler belt 31 in which a pair of flat rubber transmission parts 35 and 35 are formed near the side is provided. And the front wheel 38 provided with the iron transmission parts 39 and 39 rotatably attached to the crawler frame 37 of the traveling apparatus main body is a rubber transmission part of the said rubber crawler belt 31 ( 35, 35) to drive by electric.

By the way, in the conventional rubber crawler traveling apparatus as described above, since the rubber transmission part 35 of the rubber crawler belt 31 to which the transmission part 39 of the front wheel 38 rotates is formed with elastic bodies, such as rubber | gum, When the vehicle becomes large, an excessive compressive load is applied to the transmission part 35, and the rubber of the transmission part 35 is destroyed or peeled off. For this reason, there exists a fault that the durability of a rubber crawler belt is low. In particular, in a crawler dump etc., when a loading load becomes large, the compressive deformation of rubber | gum becomes large, and there exists a problem that rubber | gum breaks early and peeling of an adhesive surface occurs. Therefore, in order to cope with this problem, it is conceivable to thicken the rubber of the electric rolling section 35. However, this method results in a heavy weight of the entire rubber crawler belt 31, thus increasing the running resistance. And the running efficiency is lowered.

As a means to solve such a problem, it is effective to form the surface on the front wheel 38 side with an elastic body such as rubber, and as one of the solutions, for example, the crawler traveling device disclosed in Japanese Utility Model Laid-Open No. 2-26985. There is. The publication includes an outer front wheel for guiding a rubber crawler belt (the rubber crawler belt), a front wheel body portion on the boss side, a cushion portion formed in an annular shape as an elastic material and mounted on an outer peripheral portion of the front wheel body portion, and the cushion portion. A pair of left and right front wheel departure prevention protrusions formed in an annular shape of a material having high wear resistance and mounted on an outer circumferential portion of the cushion part, and protruding inwardly of a rubber crawler belt to the front wheel body part (the guide protrusion 33). Corresponding to the side outer surface, and the crawler traveling apparatus which the contact part which regulates a side shift and is provided continuously is provided. In addition, the crawler traveling device is provided with a T-shaped separation preventing guide member so as to be able to contact the inner surface of the protrusion, thereby preventing the crawler belt from being peeled off from the front wheel body part.

On the other hand, when the front wheel side is formed of an elastic body, when the crawler belt is twisted or subjected to an external force in the thrust direction, the elastic body on the front wheel side is deformed to cause the crawler belt to come off from the front wheel. As a prior art for preventing such a crawler belt detachment, for example, according to Japanese Utility Model Laid-Open Publication No. 62-16571, there are three horizontal rows of roller portions (the above-described transmission portions 39 and 39 and the bones disposed in the inner and outer sides and the center, respectively). Corresponding to the center flange 24 of the present invention], a plurality of intermediate position setting lower transmission wheels comprising two front and rear lower driving wheels, and roller portions arranged in two rows on the inner and outer sides, It pivotally supports the front and rear, and pivotally supports the top position of each bracket oriented in one of the front and rear so that it can swing up and down on the lower side of the traveling frame connecting the driving wheel and the flow wheel at the front and rear ends. Between the inner and outer roller portions of the driving wheel, a two-coupling protrusion (corresponding to the guide protrusions 3 and 3) inside the crawler belt suspended between the driving wheel and the flow wheel is provided. Is configured to maintain Wars becomes aligned discloses a motorized wheel mounting structure is made.

Further, as another prior art for preventing the removal of the crawler belt, for example, according to Japanese Utility Model Publication No. Hei 6-12277, a crawler belt is wound around the driving wheel and the flow wheel, and the lower front wheel is electrically contacted with a running portion that contacts the road surface. In the crawler belt traveling apparatus which makes an upper front wheel electrically contact with the inside of a return traveling side, the crawler belt provided with the coupling flange which axially couples in the axial direction of the link part of a crawler belt in the axial middle part of an upper front wheel and a lower front wheel. A traveling device is described.

However, all of the above prior arts have the following problems.

In the techniques described in Japanese Utility Model Publication No. Hei 2-26985, Japanese Utility Model Publication No. Hei 62-16571 and Japanese Utility Model Publication No. Hei 6-12277, all of the pairs provided in the center of the crawler belt Although the guide body, the roller part in the center, and the engaging flange are engaged between the projections to prevent the crawler belt from being separated, the contact with the inner surface of the front wheel facing the outer surface of the projection is not prevented. As a result, when the rubber front wheel is used, the inner surface of the rubber front wheel contacts the outer surface of the projection, causing wear or damage of the rubber front wheel, and durability of the front wheel is not guaranteed, resulting in increased maintenance costs.

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned conventional problems, which enables to improve ride comfort and to reduce running noise, and to improve the durability of the rubber transmission part and front wheel tire part of the rubber crawler belt, and at the same time, the rubber crawler belt is next to the uneven road surface. It is an object of the present invention to provide a crawler traveling device that can prevent slipping or slipping off.

In order to achieve the above object, the invention described in claim 1 includes a mandrel having a pair of left and right guide protrusions projecting inward in a substantially central portion of the crawler belt width direction in a crawler belt body made of an elastic material such as rubber. Is mounted at a predetermined interval along the longitudinal direction of the crawler belt, and is mounted on the lower part of the vehicle body and the rubber crawler belt having a pair of rubber transmission parts formed on the inner and outer circumferential surfaces of the pair of left and right guide protrusions and on the inner circumferential surface of the crawler belt. In a crawler traveling device of a work vehicle, which is rotatably attached to a crawler frame and which has a front wheel that is driven by a pair of left and right rubber transmission parts of a rubber crawler belt, the front wheel protrudes from the boss and the widthwise center portion of the boss. A disk-shaped center flange and an outer peripheral portion of both ends of the boss in the width direction with the center flange therebetween. A pair of left and right tires formed in an annular shape of the bonded elastic material, and a predetermined gap a1 provided between the widthwise side surface of the outer peripheral portion of the center flange of the front wheel and the inner side surfaces of the left and right guide protrusions of the rubber crawler belt. It is set as the structure (a1 <b) smaller than the predetermined clearance b which exists between the inner side surface of a pair of left and right tires of a front wheel, and the outer side surface of the said guide protrusion.

According to the invention described in claim 1, the force in the thrust direction from the rubber crawler belt is received by the center flange of the center portion of the front wheel, and the upper and lower loads are applied to the rubber front of the tire and the rubber crawler belt at both ends of the front wheel. Received by the East Therefore, the ride comfort and the running noise reduction are further improved by the tire of the elastic body than the rubber crawler belt alone, and the durability of the rubber transmission portion of the rubber crawler belt is remarkably improved. Furthermore, by using the outer periphery of the front wheels as the tire, it is not necessary to thicken the elastic body of the rubber crawler belt and the weight of the crawler traveling apparatus as a whole is reduced, so that the running efficiency is improved.

In addition, by setting a1 <b, the guide protrusion abuts the center flange first, so that the center flange is subjected to thrust load and is not applied to the tire. Therefore, the degree of wear and damage of the tire is significantly reduced, thereby improving tire durability. do.

The invention described in claim 2 further includes a mandrel having a pair of left and right guide protrusions projecting inward in a substantially central portion of the crawler belt width direction in a crawler belt body made of an elastic material such as rubber. Can be buried at predetermined intervals, and can be rotated on a rubber crawler belt provided with a pair of rubber transmission parts on the left and right sides of the guide protrusion and on the inner circumferential surface of the crawler belt and a crawler frame mounted on the lower part of the vehicle body. A crawler traveling apparatus for a work vehicle having a front wheel which is attached to the rubber crawler belt, and has a front wheel which is driven by a pair of left and right rubber transmission parts of a rubber crawler belt, wherein the crawler frame has a predetermined cross-sectional shape and The guide body passing between the pair of guide protrusions is attached, and the front wheel is the boss and the width direction of the boss. It is provided with a pair of left and right tires formed in an annular shape of an elastic material respectively attached to the outer peripheral portion of the end portion, and is provided between the side surfaces of the crawler belt width direction of the guide body and the inner side surfaces of the pair of left and right guide protrusions of the rubber crawler belt. The clearance a2 is smaller than the predetermined clearance b between the inner and outer surfaces of the pair of left and right tires of the front wheel and the outer surface of the guide protrusion (a2 &lt; b).

According to the invention described in claim 2, the force in the thrust direction from the rubber crawler belt is received by the guide body provided in the crawler frame, and the upper and lower loads are applied to the tires on both the left and right ends of the front wheel and the rubber transmission parts of the rubber crawler belt. Received by Therefore, the ride comfort and the running noise reduction are further improved by the tire of the elastic body than the rubber crawler belt alone, and the durability of the rubber transmission portion of the rubber crawler belt is remarkably improved. Furthermore, by using the outer periphery of the front wheels as the tire, it is not necessary to thicken the elastic body of the rubber crawler belt and the weight of the crawler traveling apparatus as a whole is reduced, so that the running efficiency is improved.

Further, by setting a2 <b, the guide protrusion abuts the center flange first, so that the center flange is subjected to thrust load and is not applied to the tire, and the degree of wear and damage of the tire is significantly reduced, thereby improving the durability of the tire. .

According to the invention described in claim 3, in the crawler traveling device according to claim 1 or 2, the tire can be detached.

According to the invention described in claim 3, since only the tire can be easily replaced when the tire needs to be replaced due to wear or damage to the tire, the maintenance cost of the front wheel can be reduced.

The invention described in claim 4 is a crawler traveling device according to claim 1 or 2, wherein the inner surface of the tire opposing the outer surface of the guide protrusion is substantially perpendicular to the center of rotation of the front wheel. I did it.

According to the invention described in claim 4, even if the contact surface of the tire which is driven by the rubber transmission part of the rubber crawler belt is worn, the gap b between the inner surface of the tire and the outer surface of the guide protrusion does not change. Therefore, the relationship (a1 <b, or a2 <) between the clearance gap b set at the time of the tire and the clearance gap a1, a2 between the outer surface of the center flange of the front wheel or the guide body of the crawler frame and the inner surface of the guide protrusion. Since b) is maintained over time, the tire is not damaged and can exert a good cushioning and noise suppression effect over a long period of time.

The invention described in claim 5 is a crawler traveling device according to claim 1 or 2, wherein the outer surface of the guide protrusion opposing the inner surface of the tire is substantially vertical. will be.

According to the invention as recited in claim 5, even if the contact surface of the tire driven by the rubber transmission part of the rubber crawler belt is worn, the gap b between the inner surface of the tire and the outer surface of the guide protrusion does not change. Therefore, the relationship (a1 <b or a2 <b) between the clearance gap b set at the time of the tire and the clearance gaps a1 and a2 between the outer surface of the center flange of the front wheel or the guide body of the crawler frame and the inner surface of the guide protrusion. ) Is maintained even over time, so that the tire is not damaged and can exhibit a good cushioning and noise suppression effect over a long period of time.

EMBODIMENT OF THE INVENTION Below, embodiment of the crawler traveling apparatus which concerns on this invention is described in detail with reference to drawings.

First, a crawler type dump truck is shown as an example of the work vehicle to which the crawler traveling apparatus which concerns on this invention is applied to FIG. In the figure, the crawler type dump truck is provided with a pair of crawler type traveling devices 50 and 50 to the left and right of the truck frame 55, and the turning device 56 is provided on the upper part of the truck frame 55. The furnace upper swing body 57 is mounted in a rotatable manner. An cab 58 is provided at the front of the upper swing body 57, and a carrier 59 is provided at the rear of the upper swing body 57 so as to be able to swing in the vertical direction.

The crawler-type traveling device 50 includes a crawler frame 10 in the longitudinal direction (the front and rear direction of the vehicle), and the sprocket 52 and the idler 53 (idle 53) at the front and rear ends of the crawler frame 10, respectively. Is rotatably attached. A plurality of front wheels 20 (first embodiment) or front wheels 20A (second embodiment) are rotatably attached to the lower part of the crawler frame 10. Further, the rubber crawler belt 1 is wound around the outer circumferential portions of the sprocket 52, the idler 53, and the front wheels 20, 20A. In addition, the number of crawler-type traveling apparatuses 50 is not limited to two, What is necessary is just to provide at least 1 or more in a work vehicle, for example, may be provided with multiple left-right pairs.

Next, based on FIG. 2, 1st Embodiment of the crawler traveling device which concerns on this invention is described.

In FIG. 2, the shaft 12 of the front wheel 20 is fixed to the crawler frame 10 by bolts 14 via the left and right brackets 13 and 13. The boss portion 21 is fitted to the shaft 12 and is supported by the shaft 12 so as to be rotatable through the left and right bearings 22 and 22. The left and right end faces of the boss portion 21 are in contact with the inner end faces of the brackets 13 and 13 so as to be slidable through the thrust plates 23 and 23. Floating seals 15 and 15 (floating seals) are provided between the left and right ends of the boss portion 21 and the brackets 13 and 13 to seal the lubricating oil in the shaft portion.

The center flange 24 which protrudes is formed in the width direction center part of the outer peripheral surface of the boss part 21, and the outer peripheral part cross section has a predetermined smooth surface on both sides of the width direction. The predetermined smooth surface of the center flange 24 is a surface for contacting the inner surfaces of the guide protrusions 3 and 3 of the rubber crawler belt 1 to be described later. In this embodiment, the guide protrusions 3 and 3 are provided. It is formed in a plane having an inclination substantially the same as the inclination of the inner surface of the. Then, a pair of tires 25 and 25 fixed to the outer peripheral portions of the pair of rims 26 and 26 by baking or the like are fitted into the widthwise both ends of the outer peripheral portion of the boss portion 21. The insertion end portions of the rims 26, 26 are fixed to the boss portion 21 by bolts 28, 28 via clampers 27, 27, respectively. By attaching and detaching the clampers 27 and 27, the tires 25 and 25 can be replaced with the rims 26 and 26 integrally.

On the other hand, the rubber crawler belt 1 protrudes toward the inside of the crawler belt in a substantially center portion in the width direction in the crawler belt body 2 made of an elastic material such as rubber, and a pair of guides provided at predetermined intervals in the width direction. The mandrel 4 provided with the projections 3 and 3 is embedded at predetermined intervals along the longitudinal direction of the crawler belt. Moreover, a pair of rubber transmission parts 5 and 5 are formed in the width direction outer side vicinity of this guide protrusion 3 and 3, and also in the inner peripheral surface of the crawler belt main body 2. As shown in FIG.

Then, the rubber crawler belt (1) is wound around and mounted so that the center flange (24) of the front wheel (20) is located between the left and right pair of guide protrusions (3, 3), and the rubber transmission parts (5, 5) are mounted. The pair of tires 25, 25 of the front wheels 20 are each electrically driven.

Here, the left and right side surfaces of the center flange 24 face each other with a predetermined gap a1 on the inner surfaces of the guide projections 3 and 3, and the inner surfaces of the tires 25 and 25 are guide projections 3. , 3) face each other with a predetermined gap b on the outer surface. And each gap is set so that it may become "gap a1 <gap b".

According to this first embodiment, the force in the thrust direction from the rubber crawler belt 1 is such that the inner surface of the guide protrusions 3, 3 abuts against the center flange 24 of the front wheel 20, whereby the center flange ( 24), and an up-and-down load is received by the rubber transmission parts 5 and 5 of the rubber crawler belt 1, and the left and right tires 25 and 25 of the front wheel 20. As shown in FIG. Accordingly, the tires 25 and 25 of the elastic body improve the ride comfort more than the case of the rubber crawler belt 1 alone, and reduce the vertical load applied to the rubber transmission parts 5 and 5 of the rubber crawler belt 1. Therefore, the durability of the rubber transmission parts 5 and 5 is remarkably improved.

Further, since the center flange 24 is made of steel, even when the rubber crawler belt 1 is twisted, the metal guide protrusions 3 and 3 receive a predetermined reaction force from the center flange 24, so that both guide protrusions The center flange 24 does not deviate between (3, 3), and therefore the rubber crawler belt 1 does not come off.

Moreover, since it is set so that it may become "gap a1 <gap b", the side surface of the center flange 24 contacts the inner surface of the guide protrusions 3 and 3 before the inner surface of the tire 25, and the tire 25 is carried out. It is prevented that the inner surface of the abutment on the outer surfaces of the guide protrusions 3 and 3 is prevented. As a result, the thrust load is not applied to the tires 25 and 25, and the durability of the tires 25 and 25 is also improved.

In addition, since the tires 25 and 25 are detachable by the clampers 27 and 27, the tires 25 and 25 can be easily replaced when the tires 25 and 25 are worn or damaged, thus maintaining the front wheels 20. The cost is reduced.

Next, a second embodiment of a crawler traveling device according to the present invention will be described with reference to FIG. 3.

In FIG. 3, the shaft 12 of the front wheel 20A is fixed to the crawler frame 10 by bolts 14 via the left and right brackets 13 and 13. The boss portion 21A is fitted to the shaft 12 and is supported by the shaft 12 so as to be rotatable through the left and right bearings 22 and 22. The left and right end faces of the boss portion 21A are in contact with the inner end faces of the brackets 13 and 13 so as to be slidable via the thrust plates 23 and 23. Floating seals 15 and 15 are provided between the left and right ends of the boss portion 21A and the brackets 13 and 13 to seal the lubricating oil in the shaft portion.

Further, a pair of tires 25 and 25 fixed to the outer peripheral portions of the pair of rims 26 and 26 by baking or the like are fitted to both ends of the outer circumferential portion of the boss portion 21A, respectively. The insertion end portions 26 and 26 are fixed to the boss portion 21A by bolts 28 and 28 via clampers 27 and 27, respectively. By attaching and detaching the clampers 27 and 27, the tires 25 and 25 can be replaced with the rims 26 and 26 integrally.

As shown in FIG. 3, the crawler frame 10 has a guide body 11 having a substantially trapezoidal shape in cross section facing the inner side surfaces of the guide protrusions 3 and 3 in the longitudinal direction thereof. It is provided in the longitudinal direction of.

On the other hand, the rubber crawler belt 1 protrudes toward the inside of the crawler belt in a substantially center portion in the width direction in the crawler belt body 2 made of an elastic material such as rubber, and a pair of guides provided at predetermined intervals in the width direction. The mandrel 4 provided with the projections 3 and 3 is embedded at predetermined intervals along the longitudinal direction of the crawler belt. Moreover, a pair of rubber transmission parts 5 and 5 are formed in the width direction outer side vicinity of this guide protrusion 3 and 3, and also in the inner peripheral surface of the crawler belt main body 2. As shown in FIG.

In the rubber transmission parts 5 and 5, the pair of tires 25 and 25 of the front wheels 20A are respectively rolled.

Here, the left and right side surfaces of the guide body 11 face each other with a predetermined gap a2 on the inner side surfaces of the guide protrusions 3, 3, and the inner side surfaces of the tires 25, 25 are guide protrusions 3. , 3) face each other with a predetermined gap b on the outer surface. And each gap is set so that it may become "gap a2 <gap b".

According to this second embodiment, the force in the thrust direction from the rubber crawler belt 1 abuts against the outer surface of the guide body 11 provided on the crawler frame 10 by the inner surfaces of the guide protrusions 3, 3. The upper and lower loads are received by the rubber transmission parts 5 and 5 of the rubber crawler belt 1 and the left and right tires 25 and 25 of the front wheel 20A. Therefore, the ride comfort is further improved by the tires 25 and 25 of the elastic body than the rubber crawler belt 1 alone, and the vertical loads applied to the rubber transmission parts 5 and 5 of the rubber crawler belt 1 are reduced. The durability of the rubber transmission parts 5 and 5 is remarkably improved.

Since the guide body 11 is made of steel, even when the rubber crawler belt 1 is twisted, the metal guide protrusions 3 and 3 receive a predetermined reaction force from the guide body 11, so that both guide protrusions 3 and 3 The guide body 11 does not deviate between), and therefore the rubber crawler belt 1 does not come off.

Moreover, since it is set so that it may become "gap a2 <gap b", the side surface of the guide body 11 contacts the inner surface of the guide protrusions 3 and 3 before the inner surface of the tire 25, and the tire 25 is carried out. It is prevented that the inner surface of the abutment on the outer surfaces of the guide protrusions 3 and 3 is prevented. As a result, the thrust load is not applied to the tires 25 and 25, and the durability of the tires 25 and 25 is also improved.

In addition, since the tires 25 and 25 are detachable by the clampers 27 and 27, maintenance costs of the front wheels 20A can be easily changed when the tires 25 and 25 are worn or damaged. This is reduced.

Next, a third embodiment of a crawler traveling device according to the present invention will be described with reference to FIG. 5. 5 is a detailed view of the vicinity of the tire and the guide protrusion. In addition, in the same figure, the same code | symbol is attached | subjected to the component same as previous embodiment, and the description here is abbreviate | omitted.

This embodiment changes the shape of the tires 25 and 25 in the said 1st, 2nd embodiment. That is, the inner surface of the tire 25A, 25A inserted in the width direction both ends of the front wheel 20 or the front wheel 20A is substantially perpendicular to the shaft center 12a of the shaft 12. As shown in FIG. Since other configurations are the same as in the first and second embodiments, the description is omitted.

According to this third embodiment, since the rolling surfaces of the rubber transmission sections 5, 5 of the rubber crawler belt 1 and the inner surfaces of the tires 25A, 25A are almost perpendicular, the rubber transmission sections 5, 5 Even if the contact surfaces of the tires 25A and 25A to be worn are worn, the gap b between the inner surfaces of the tires 25A and 25A and the outer surfaces of the guide protrusions 3 and 3 does not change. Therefore, the tires 25A and 25A are not damaged and can exhibit good cushioning, noise reduction effect and effect over a long period of time.

Since other effects are the same as in the first and second embodiments, the description is omitted.

Next, a fourth embodiment of a crawler traveling device according to the present invention will be described with reference to FIG. 6. 6 is a detailed view of the vicinity of the tire and the guide protrusion in the present embodiment. In addition, in the same figure, the same code | symbol is attached | subjected to the component same as previous embodiment, and the description here is abbreviate | omitted.

This embodiment changes the shape of the guide protrusions 3 and 3 of the rubber crawler belt 1 in the said 1st, 2nd embodiment. In other words, the outer surfaces of the guide protrusions 3A and 3A are substantially perpendicular to the shaft center 12a of the shaft 12. Since other configurations are the same as those of the first and second embodiments, the description is omitted.

According to this fourth embodiment, since the rolling surfaces of the rubber transmission sections 5, 5 of the rubber crawler belt 1 and the outer surfaces of the guide projections 3A, 3A are perpendicular, the rubber transmission sections 5, 5 Even if the contact surfaces of the tires 25 and 25 to be driven are worn, the gap b between the inner surfaces of the tires 25 and 25 and the outer surfaces of the guide protrusions 3A and 3A does not change. Therefore, the tires 25 and 25 are not damaged and can exhibit the effects and effects of good cushioning and noise reduction over a long period of time. Since other effects are the same as in the first and second embodiments, the description is omitted.

According to the present invention, it is possible to improve the ride comfort and at the same time improve the durability of the rubber transmission part of the rubber crawler belt and the front wheel tire part, and also prevent the crawler belt from shifting sideways or coming off from the uneven road surface.

Claims (5)

A crawler belt is provided with a mandrel 4 having a pair of right and left guide protrusions 3 and 3 projecting inward in a substantially central portion of the crawler belt axial direction in a crawler belt body 2 made of an elastic material such as rubber. At a predetermined interval along the longitudinal direction of the rubber, and at the outer side in the width direction of the left and right pair of guide protrusions 3 and 3, and on the inner circumferential surface of the crawler belt, the rubber having the left and right pairs of rubber transmission parts 5 and 5 formed thereon. The front wheel 20 which is rotatably attached to the crawler belt 1 and the crawler frame 10 attached to the lower part of the vehicle body, and which is electrically driven by a pair of left and right rubber transmission parts 5 and 5 of the rubber crawler belt 1. In the crawler traveling apparatus of the work vehicle provided with The front wheel 20 has a boss 21, a disk-shaped central flange 24 protruding from the central portion of the boss 21 in the width direction, and an outer peripheral portion of both ends of the boss 21 in the width direction with the central flange 24 therebetween. And a pair of left and right tires 25 and 25 each formed in an annular shape of an elastic material attached to the The front wheel 20 includes a predetermined gap a1 between the widthwise side surface of the outer peripheral portion of the center flange 24 of the front wheel 20 and the inner surfaces of the pair of right and left guide protrusions 3 and 3 of the rubber crawler belt 1. A crawler characterized by being smaller than a predetermined gap b between the inner surfaces of the left and right pairs of tires 25 and 25 and the outer surfaces of the guide protrusions 3 and 3 (a1 &lt; b). Traveling device. In the crawler belt main body 2 which consists of elastic materials, such as rubber | gum, the mandrel 4 provided with the pair of left and right guide protrusions 3 and 3 which protrude inward in the substantially center part of the crawler belt width direction is a longitudinal direction of a crawler belt. Rubber crawler belts which are embedded at predetermined intervals along the widthwise side, and have left and right pairs of rubber transmission parts 5 and 5 formed in the widthwise outer side of the left and right pair of guide protrusions 3 and 3 and on the inner circumferential surface of the crawler belt ( 1) and a front wheel 20A rotatably attached to the crawler frame 10 mounted below the vehicle body, and electrically driven by a pair of left and right rubber transmission parts 5 and 5 of the rubber crawler belt 1. In a crawler traveling device of a work vehicle, The crawler frame 10 is attached with a guide body l1 having a predetermined cross-sectional shape and passing between the right and left pair of guide protrusions 3 and 3 of the rubber crawler belt 1, The front wheel 20A includes a boss 21A and a pair of left and right tires 25 and 25 formed in an annular shape of an elastic material respectively attached to outer peripheral portions of both ends of the width direction of the boss 21A, The left and right sides of the front wheels 20 have a predetermined gap a2 between the side surfaces of the guide body 11 in the width direction of the crawler belt and the inner surfaces of the pair of right and left guide protrusions 3 and 3 of the rubber crawler belt 1. A crawler traveling device, characterized by being smaller than a predetermined gap (b) between the inner surface of the pair of tires (25, 25) and the outer surface of the guide protrusions (3, 3). The crawler traveling device according to claim 1 or 2, wherein the tire (25, 25) is detachable. The crawler according to claim 1 or 2, characterized in that the inner surfaces of the tires (25, 25) facing the outer surfaces of the guide protrusions (3, 3) are substantially perpendicular to the center of rotation of the front wheels (20). Traveling device. The crawler traveling device according to claim 1 or 2, wherein the outer surface of the guide protrusion (3, 3) facing the inner surface of the tire (25, 25) is almost vertical.

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