JP2021000934A - Rolling wheel used in rubber crawler device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight, while making the wheels made of synthetic resin, avoiding damage to the wheels due to pebbles or the like being caught between the rubber crawlers and the wheels, and further deteriorating due to wear of the wheels. To prevent. SOLUTION: A composite having left and right flange portions 33, 33 sandwiching a guide protrusion 211 of a rubber crawler 21 in a rolling wheel 3 of a rubber crawler traveling device inscribed in a rubber crawler 21 hung around a drive wheel and a floating wheel. It is composed of a resin wheel base 31 and a protective ring 32 attached to the flange portion 33. [Selection diagram] Fig. 4

Description

The present invention relates to wheels used in rubber crawler traveling devices of construction machines and work vehicles.

For construction machines and work vehicles that move on rough terrain, rubber crawler traveling devices are used as means of transportation. The rubber crawler traveling device is configured by inscribed a rolling wheel arranged between the driving wheel and the floating wheel on a rubber crawler hung around the driving wheel and the floating wheel. The wheels include a lower wheel that touches the rubber crawler to the ground and an upper wheel that suppresses the slack of the orbiting rubber crawler. Many of the wheels used for metal crawlers are made of cast metal so that many wheels can be prepared at low cost. However, the wheels used for rubber crawlers may be made of synthetic resin for the purpose of weight reduction (Patent Document 1).

The wheels disclosed in Patent Document 1 (which are actually considered to be idle wheels because they are referred to as "adjustable wheels") are made of synthetic resin and remain flat without the reinforcing ribs on the side surface corresponding to the movable frame side. Reinforcing ribs are provided on the other side (Patent Document 1, claims for utility model registration). As a result, it is said that pebbles and the like carried to the rubber crawler (track zone) can get caught in the reinforcing ribs and prevent not only the rolling wheels but also the rubber crawlers and the movable frame from being damaged. (Patent Document 2, page 4, line 17 to page 5, line 3).

Jitsuzensho 53-076433 Gazette

A synthetic resin wheel is desirable for reducing the weight of the wheel, but as pointed out in Patent Document 2, the wheel is damaged due to pebbles or the like being caught between the rubber crawler and the wheel. It becomes a problem. Further, even if the pebbles and the like are not bitten, it is considered that the wear of the synthetic resin wheels is unavoidable due to the long-term rubbing against the orbiting rubber crawler. Therefore, in order to reduce the weight, the wheels are made of synthetic resin, while avoiding damage to the wheels due to pebbles or the like being caught between the rubber crawlers and the wheels, and further preventing deterioration due to wear of the wheels. I considered it.

The one developed as a result of the study is made of synthetic resin having left and right flanges that sandwich the guide protrusions of the rubber crawler in the rolling wheels of the rubber crawler traveling device that is inscribed in the rubber crawler hung around the drive wheels and idler wheels. It is a wheel of a rubber crawler traveling device, which is composed of a wheel base and a protective ring attached to the flange portion. In the wheel of the present invention, the wheel base is made of synthetic resin to reduce the weight, and the flange portion that is worn by the wheel base biting pebbles or rubbing against a rubber crawler is protected by a protective ring. To do.

The protective ring may be attached to the flange portion by any means as long as it can be attached to the flange portion, and can be attached by a fitting structure having a transfer relationship or by adhesion or fusion. Further, the protective ring may be a portion that comes into contact with pebbles or a rubber crawler instead of the wheel substrate, and may be made of metal, ceramics, synthetic resin, or rubber regardless of the material. The protective ring made of metal or ceramic is preferably hollow in view of weight reduction of the rolling wheel. Protective rings made of synthetic resin or rubber have wear resistance, but wear instead of the wheel substrate. Therefore, for example, it is preferable that a wear resistant film can be formed on the surface or the ring can be replaced.

If the wheel substrate is made of fiber-reinforced synthetic resin, the structural strength is enhanced. Synthetic resins include polyurethane resin, unsaturated polyester resin, epoxy resin, vinyl ester resin, bismaleimide resin, phenol resin, cyanate resin, polyimide resin, etc. as thermosetting resins, and polyurethane resin, nylon resin, polypropylene as thermoplastic resins. Examples thereof include resins, polyetherimide resins, polycarbonate resins, polyether teflate resins, polyamide resins, polyether sulfone resins, polyphenylene sulfide resins, and polyether ether ketone resins. Examples of the fibers include short fibers or long fibers such as carbon fibers, glass fibers, ceramic fibers, aramid fibers, carbon nanotubes, and cellulose nanofibers, which are uniformly dispersed and mixed with synthetic resins, or the directions of the fibers are aligned. Infiltrates synthetic resin.

If the wheel substrate is made of a fiber-reinforced synthetic resin formed by laminating and hardening a fiber-reinforced resin sheet (prepreg) or a fiber-reinforced resin plate in the extending direction of the rotation axis, the directionality of the fibers is determined. It is preferable because it can be aligned. The directionality of the fibers should be aligned parallel to the overhanging direction of the flange portion. In this case, the flange portion has a structure in which fiber layers are laminated, and the fiber layers may be separated from each other (delamination). The protective ring adhered or fused to the flange portion also functions to prevent the layers of the fibers constituting the flange portion from delamination in the rolling wheel substrate formed by infiltrating the fibers into the synthetic resin in a directional manner. is there.

The rolling wheel substrate is formed in a state where the fiber reinforced resin sheet or the fiber reinforced resin plate is covered on the outer peripheral surface of the flange portion, and when the protective ring is fitted on the surface of the fiber reinforced resin sheet or the fiber reinforced resin plate, the flange is formed. The unity of the part is strengthened. The fiber reinforced resin sheet or the fiber reinforced resin plate is used by one or several layers. When the wheel substrate has a structure in which the direction of the fibers is aligned parallel to the overhanging direction of the flange portion, the delamination of the fiber layer at the flange portion is caused by the fiber reinforced resin sheet or the fiber reinforced resin covering the outer peripheral surface of the flange portion. Prevented by a plate. Further, when the fiber reinforced resin sheet or the fiber reinforced resin plate covering the outer peripheral surface of the flange portion covers the side surface of the flange portion, the wear of the side surface is prevented.

The protective ring may be made of any material and structure as long as it can protect the flange portion. However, if the protective ring is made of rubber, it can absorb the impact applied to the wheels due to the elastic deformation of the protective ring. Examples of the rubber include hard rubber such as natural rubber, styrene-butadiene rubber (SBR), isoprene rubber (IR), butandien rubber (BR), and urethane rubber. These hard rubbers are used in automobile tires, are easily available, and are inexpensive. When it is desired to suppress the elastic deformation of the rubber protective ring, it is advisable to adjust the hardness of the rubber and to mix the various fibers described above. In this case, if the directions of the fibers are aligned parallel to the overhanging direction of the flange portion, elastic deformation is suppressed in the direction orthogonal to the overhanging direction.

The wheels used in the crawler traveling device of the present invention have the effect of reducing the weight of the wheels and preventing deterioration due to breakage or wear. The weight reduction of the wheels is an effect of making the wheel base made of synthetic resin. The suppression or prevention of deterioration due to breakage or wear of the synthetic resin wheels is an effect due to the wear resistance of the protective ring attached to the flange portion of the wheel substrate. Since the protective ring has an effect due to the wear resistance, when a fiber-reinforced synthetic resin wheel substrate is used, the structural strength of the wheel is improved, and the weight of the wheel is reduced and the wheel is damaged or deteriorated due to wear. It is possible to achieve both prevention and prevention.

A fiber-reinforced resin sheet or a fiber-reinforced resin plate that covers the outer peripheral surface of the flange portion has an effect of enhancing the integrity of the flange portion. The effect of enhancing the integrity of the flange portion is to prevent delamination of the fiber layer when the fiber layers are aligned in the overhanging direction of the flange portion, particularly in a fiber-reinforced synthetic resin wheel substrate. That is, peel resistance is realized. As a result, the durability of the flange portion of the wheel base can be improved, and the durability of the wheel itself can be improved.

Since the rubber protective ring has excellent wear resistance and shock absorption due to elastic deformation, it has the effect of better preventing damage and wear of the rolling wheel substrate. Further, the rubber protective ring has almost the same density as the wheel substrate made of synthetic resin or fiber-reinforced synthetic resin, and even if the thickness in the radial direction is increased, the weight of the wheel increases. Since it is made of synthetic resin, it has the advantage of not hindering the effect of reducing the weight of the wheel substrate. In addition, the rubber protective ring has the advantage that it can be molded at the same time as the wheel substrate and can be attached to the flange portion of the wheel substrate from the beginning, and has a secondary effect such as reduction of manufacturing cost.

It is a side view which shows an example of the construction machine using the wheel of this invention. It is a perspective view showing the rubber crawler traveling apparatus of this example excerpted. It is a perspective view of the rolling wheel of this example. It is sectional drawing of the rolling wheel of this example. It is an enlarged view of the arrow view part A in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As seen in FIG. 1, for example, the wheel 3 of the present invention is used in a rubber crawler traveling device 2 that is often used in a small construction machine 1. In the rubber crawler traveling device 2 of this example, the rubber crawler 21 is hung around the front guide wheel 23 and the rear drive wheel 22, and three rolling wheels are pivotally attached to the rotating shaft 241 supported by the support frame 24. 3 is configured to ground the peripheral surface under the rubber crawler 21.

As seen in FIG. 2 (driving wheels 22, guide wheels 23 and support frame 24 are not shown), the rolling wheels 3 are provided in pairs on the inner peripheral surface of the rubber crawler 21 as in the conventional case. The flange-shaped guide protrusions 211 are sandwiched between a pair of left and right flange portions 33 and rotated to adjust the orbit of the rubber crawler 21. The rolling wheel 3 of this example is a lower rolling wheel, but is also applied to an upper rolling wheel. Further, although the number of rolling wheels 3 in this example is three, a larger number may be arranged. Since the wheel 3 of the present invention has been reduced in weight, the effect of weight reduction increases as the number of installed units increases.

As seen in FIGS. 3 and 4, the rolling wheel 3 of this example has a rolling wheel base 31 having left and right flange portions 33 sandwiching a guide protrusion 211 of the rubber crawler 21, and a protection attached to the flange portion 33. It consists of a ring 32. The rolling wheel base 31 has a rotating shaft hole 313 that penetrates left and right including the left and right flange portions 33, and the rotating shaft 241 is inserted into the rotating shaft hole 313 and shafts through the support frame 24 in a rotatable state. It is worn (see Fig. 1). The protective ring 32 is adhered to the surface of the fiber reinforced resin sheet 312 that covers the outer peripheral surface 331 of the flange portion 33.

The wheel base 31 of this example is configured by laminating fiber reinforced resin sheets 311 (in FIG. 4, the direction of the fiber layer of each fiber reinforced resin sheet 311 is shown by a thick line). A fiber reinforced resin sheet 311 is wound concentrically with the rotating shaft hole 313 in the main body portion (intermediate portion sandwiched between the flange portions 33) of the rolling wheel base 31. In the flange portion 33, the fiber reinforced resin sheet 311 of the main body portion is bent, and the fiber reinforced resin sheet 312 is separately superposed on the outer peripheral surface 331 so that the direction of the fibers is aligned with the overhanging direction of the flange portion 33.

When the fiber-reinforced resin sheet 311 is, for example, a carbon prepreg in which carbon fibers are impregnated with an epoxy resin which is a thermosetting resin, the wheel base 31 is formed by aligning the carbon prepregs in the direction of the above-mentioned fiber layer and stacking them. The carbon prepregs are bonded to each other and then heated to solidify to form a structure. In addition to the prepreg molding of this example, the wheel base 31 made of the fiber-reinforced resin sheet 311 can be constructed by using various existing molding methods such as RTM molding, stamping molding, injection molding, etc., or the resin is thermoplastic. If there is, it can be integrated in a heated state, then cooled to solidify and molded.

In the wheel base 31 of this example, the outer peripheral surface 331 is covered with the fiber reinforced resin sheet 312 straddling the side surface of the flange portion 33, and the inner peripheral surface 321 of the protective ring 32 is adhered to the surface of the fiber reinforced resin sheet 312. There is. The fiber-reinforced resin sheet 312 protects the side surface of the flange portion 33 and bundles the fiber layers constituting the flange portion 33 to prevent delamination. The fiber-reinforced resin sheet 312 may be attached to the flange portion 33 by adhesion after manufacturing the wheel base 31, or is laminated together with the fiber-reinforced resin sheet 311 constituting the wheel base 31 when the wheel base 31 is manufactured. Then, it may be attached to the flange portion 33.

The material of the protective ring 32 is not limited as long as the flange portion 33 can be protected, but in the case of this example, the protective ring 32 is made of an ester-based or ether-based urethane rubber. Urethane rubber has excellent wear resistance, chemical resistance, and oil resistance, as well as high mechanical strength and load resistance, and has the advantages of high elasticity and high energy absorption, and is suitable for the protective ring 32. .. The urethane rubber protective ring 32 is a short fiber such as carbon fiber, glass fiber, ceramic fiber, aramid fiber, carbon nanotube, cellulose nanofiber, etc. when it is desired to suppress elastic deformation or give direction to elastic deformation. It is advisable to mix an appropriate amount of long fibers and particles such as carbon black, silica, and nanoclay.

The inner peripheral surface 321 of the protective ring 32 of this example and the outer peripheral surface 331 of the flange portion 33 that covers the fiber reinforced resin sheet 312 are both flat surfaces. The protective ring 32 is adhered to the outer peripheral surface 331 of the flange portion 33 (in this example, the surface of the fiber reinforced resin sheet 312 covering the outer peripheral surface 331), so that the fibers of the fiber reinforced resin sheet 311 constituting the flange portion 33 are adhered to. The delamination of the layers is prevented. For this reason, the inner peripheral surface 321 of the protective ring 32 and the outer peripheral surface 331 of the flange portion 33 may have any surface shape as long as they can be adhered to each other. However, from the viewpoint of increasing the adhesive strength, for example, the inner peripheral surface 321 and the outer peripheral surface 331 are used as curved surfaces of the transfer structure, and the inner peripheral surface 321 and the outer peripheral surface 331 (in this example, the fiber reinforced resin sheet 312 covered on the outer peripheral surface 331). The adhesive area of the surface) may be increased.

As seen in FIG. 5, the rubber protective ring 32 undergoes elastic deformation that slightly expands in the left-right direction due to, for example, the load F1 applied from the rubber crawler 21 to the wheel 3, and the wheel base 31 (particularly the flange portion). The load F2 applied to 33) is reduced, and as a result, the wear of the wheel base 31 is suppressed or reduced. Further, the rubber protective ring 32 can suppress elastic deformation by reinforcing the fiber, and can improve heat resistance, heat dissipation, and abrasion resistance. Heat resistance and heat dissipation extend the life of the rubber protective ring 32.

1 Construction machinery 2 Rubber crawler traveling device
21 Rubber crawler
211 Guide protrusion
22 drive wheels
23 Guide wheel
24 Support frame
241 Rotating shaft 3 Rolling wheels
31 Rolling base
311 Fiber reinforced resin sheet that constitutes the wheel substrate
312 Fiber reinforced resin sheet that covers the outer peripheral surface of the flange
313 Rotating shaft hole
32 protective ring
321 Inner circumference
33 Flange part
331 Outer surface
Load applied to F1 wheels
Load applied to the F2 wheel substrate

Claims (5)

In the rolling wheels of a rubber crawler traveling device that is inscribed in a rubber crawler that is hung around a drive wheel and a floating wheel.
A synthetic resin wheel substrate having left and right flanges that sandwich the guide protrusions of the rubber crawler,
A rolling wheel of a rubber crawler traveling device, which is composed of a protective ring mounted on the flange portion. The wheel of the rubber crawler traveling device according to claim 1, wherein the wheel substrate is made of a fiber-reinforced synthetic resin. The rubber crawler traveling device according to claim 1, wherein the wheel substrate is made of a fiber-reinforced synthetic resin formed by laminating and hardening a fiber-reinforced resin sheet or a fiber-reinforced resin plate in the extending direction of the rotation axis. Rolling wheels. The wheel base is formed in a state where the fiber reinforced resin sheet or the fiber reinforced resin plate is covered on the outer peripheral surface of the flange portion, and the protective ring is attached to the surface of the fiber reinforced resin sheet or the fiber reinforced resin plate. ~ 3 Rolling wheels of the rubber crawler traveling device according to any one of the above. The protective ring is a wheel of the rubber crawler traveling device according to any one of claims 1 to 4, which is made of rubber.

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