JP5345830B2 - Crawler travel device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler traveling device technique for improving durability of projections for driving to be occasionally brought into contact with track rollers. <P>SOLUTION: This crawler traveling device includes the projections 3 for driving and a plurality of pairs of track rollers 4. A bent part 3f located at a middle position of a projecting base part and a projecting distal end is provided on a surface opposed to each of the track rollers 4 in each of the projections 3 in a cross section of a crawler width direction of each of the projections 3. An inclined angle to a vertical surface in a base part side part of the bent part 3f is made smaller than that on a distal end part side. An inclined surface pushed out to each of the projection 3 side from an outer end position of a radial direction is provided in a surface opposed to each of the projections 3 in each of the track rollers 4 in each vertical surface including a rotary shaft in each of the track rollers 4, and a bent surface 4f bent in the midway to be away from each of the projections 3 is provided. Each inclined angle to the vertical surface orthogonal to the rotary shaft of each of the track rollers 4 of each of track roller inclined surfaces is made smaller than each inclined angle to the vertical surface in the base part side part of each of the projections 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a crawler traveling device, and in particular, proposes a technique for improving the durability of a driving projection that may come into contact with a wheel.

The crawler traveling device is disposed on the inner peripheral surface of an endless crawler which is reinforced by a steel cord or the like, with a driving protrusion formed at a predetermined pitch, for example, straddling the driving protrusion. It consists of multiple pairs of rotary.
In this crawler traveling device, there is little contact between the side surface of the driving projection and the wheel during straight traveling, but when the traveling road surface is inclined or there is a projection, the driving projection or the wheel has a crawler width. It moves in the direction, and the inner surface of the wheel contacts with the driving projection, and thereby the attitude of the crawler is controlled.

Since the engagement side surfaces of the conventional driving projection and the roller wheel are each in a vertical shape and parallel to each other in the cross section in the width direction of the crawler, when they come into contact, the contact area becomes large, A large amount of heat generation and wear occurred, and there was a risk of cracking and damage.
Further, since the engagement side surface of the wheel is vertical, when the wheel and the driving protrusion are relatively displaced in the width direction of the crawler, the wheel gets on the tip of the driving protrusion, There is a possibility that the tip corner may bite into the protrusion, and as a result, the driving protrusion may be damaged.
Moreover, since the wheels contact with the driving protrusions strongly during running on the inclined road surface, there is a risk that not only the durability of the crawler but also the fuel consumption may be deteriorated.

  On the other hand, in Patent Document 1, as shown in FIG. 4, the standing inclination angle θ1 of the left and right side surfaces in the upper half portion of the driving protrusion 23 with respect to the horizontal plane is determined from the standing inclination angle θ of the left and right side surfaces in the lower half portion. The lower side of the driving projection 23 is positioned so that the rotation axis of the rolling wheel 24 and the inner peripheral surface of the crawler are parallel to the inward side surface of the rolling wheel 24 facing the left and right side surfaces of the driving projection 23. An inclined guide surface c parallel to the left and right side surfaces of the half is formed, and the vertical length of the inclined guide surface c is set to be shorter than the vertical length of the left and right side surfaces of the lower half of the driving projection 23. According to this technique, the contact area between the driving projection 23 and the wheel 24 is reduced, the generation of frictional heat is suppressed, and the position of the misaligned driving projection 23 is reduced. Suppressing the rolling wheel 24 from getting on You can do that.

  However, in the crawler traveling device described in Patent Document 1, although the contact area between the driving protrusion 23 and the wheel 24 can be reduced compared to the conventional one, the generation of frictional heat and the like can be reduced. Between the lower half side surface of the driving projection 23 and the inclined guide surface c of the wheel 24 that are parallel to each other, the peripheral speed is toward the center of the wheel 24 (the tip of the driving projection). Therefore, the relative speed between the lower half side surface of the driving protrusion 23 and the inclined guide surface c of the wheel 24 gradually increases as the center of the wheel 24 is approached. The inner surface has the largest relative speed at the side bending point that is away from the side surface of the projection, and the driving projection 23 may be cracked due to wear of the driving projection 23 by the side bent portion. It was.

Further, due to the existence of a region where the inclined surface of the driving projection 23 and the inclined surface of the wheel 24 are parallel, in other words, since both inclined surface portions are in surface contact over the entire region, When the driving projection 23 and the roller 24, particularly the bent portion, come into surface contact, the entire surface generates heat, wear occurs, and the crawler after the wear travels on an inclined land or the like. When receiving a force in the width direction from 24, there was a possibility that a crack would occur in the worn portion.
Japanese Patent No. 3963842

  Therefore, the present invention provides a crawler traveling device that can effectively suppress a decrease in the durability of the driving protrusion even when the wheel and the driving protrusion are in contact with each other.

The crawler traveling device according to the present invention has a driving projection formed at a predetermined pitch in the circumferential direction on an inner circumferential surface of an endlessly extending crawler, and the driving projection is separated with a width direction of the crawler. A plurality of pairs of rolling wheels that move and come into contact with the driving projection, and within the cross-section in the crawler width direction of the driving projection, A bent portion located between the protruding base and the protruding tip is provided on the opposite surface, and the inclination angle of the base side portion of the bent portion with respect to the vertical surface is made smaller than that of the tip portion side, and In the vertical plane including the rotation axis of the wheel, an inclined surface that protrudes from the radially outer end position to the driving projection side is provided on the surface of the wheel facing the driving projection, and is bent in the middle. Provide a fold surface away from the drive projection, and the inclined surface of the wheel is perpendicular to the rotation axis of the wheel. That the inclination angle with respect to the vertical plane, the proximal portion of the drive protrusions, like smaller than the inclination angle with respect to the vertical plane, in a state where the protrusion for driving the focusing wheel is in contact, bent surface of the protrusion facing surface of the track roller Is provided closer to the rotating shaft of the wheel than the bent portion of the driving projection .

Here, the bent portion includes not only a bend made of a straight line but also a curved bend.
Further, the inclination angle means, for example, an average (intermediate line segment) angle of a convex curve or a concave curve formed by an inclined surface inclined from the bent portion to the tip portion and a vertical surface.

  In the above description, the inclination angle β of the inclined surface of the wheel with respect to the vertical surface orthogonal to the straight line of the wheel and the inclination angle α with respect to the similar vertical surface of the base side portion of the driving projection are 1 ° <α It is preferable to satisfy −β ≦ 30 °.

  In the crawler traveling device of the present invention, a bending portion located between the protruding base and the protruding tip is provided on the surface of the driving protrusion facing the wheel in the cross section in the crawler width direction of the driving protrusion. The angle of inclination of the base side portion of the bent portion with respect to the vertical surface is made smaller than that of the tip portion side, and the driving projection of the wheel and the driving projection in the vertical surface including the rotation axis of the wheel An inclined surface that protrudes from the outer end position in the radial direction to the driving projection side is provided on the opposite surface of the roller, and a bent curved surface that is bent in the middle and moves away from the driving projection is provided. By making the inclination angle with respect to the vertical plane perpendicular to the axis smaller than the inclination angle with respect to the same vertical surface of the base side portion of the driving protrusion, even if the wheels contact with the driving protrusion, Make the contact area on both sides sufficiently small so that the drive protrusion and Contact and performs mutual relative speed is only the base side of the small drive protrusions, it is possible to reduce the heat generation and wear of Note drive protrusions at the maximum speed difference portion. As a result, the durability of the crawler traveling device is improved.

Hereinafter, a crawler traveling device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional perspective view showing a part of the embodiment of the present invention, and FIG. 2 shows the relationship between the driving protrusion and the wheel in FIG. 1 on the inner peripheral surface of the crawler. FIG. 3 is a partial cross-sectional view in the crawler width direction shown in a rolling posture, and FIG. 3 is an enlarged view of a part of FIG.

In the figure, 1 is the entire crawler, 2 is an endlessly extending crawler body, and 3 is an inner peripheral surface of the crawler body 2 at a predetermined pitch in the circumferential direction at the center in the crawler width direction. Each of the disposed driving protrusions is shown, and the driving protrusion 3 forms a substantially square frustum-shaped driving protrusion whose protrusion height h3 from the crawler body 2 can be in the range of 40 to 95 mm.
Reference numeral 4 denotes a roller wheel having a diameter in the range of 200 to 400 mm, for example, which may roll on the inner peripheral surface of the crawler body 2 and eventually the crawler 1 and come into contact with the driving protrusion 3.

  A steel cord 5 is embedded in the crawler main body 2 as a base of the crawler 1 in parallel along the circumferential direction, and three layers of reinforcing plies 6 inclined with respect to the circumferential direction, for example, are arranged on the outer circumferential side. Established.

  On the outer peripheral surface of the crawler body 2, convex lugs 7 that act on the road surface are formed at predetermined intervals in the circumferential direction.

  The crawler body 2, the driving protrusion 3 and the lug 7 can be made of, for example, a rubber material blended with butadiene rubber having excellent wear resistance, and the thickness thereof can be 30 to 50 mm.

  Each pair of rolling wheels 4 provided in the crawler traveling device is configured in a so-called dumbbell shape by supporting the respective rolling wheels 4 straddling the driving protrusion 3 and contacting the crawler inner peripheral surface on a common support shaft. Thus, the wheels 4 support the weight of the vehicle and function to regulate the positional deviation of the crawler 1 in the width direction.

By the way, in this crawler traveling device, each driving projection 3 of the crawler 1 is provided with a bent portion 3f located between the projecting base and the projecting tip on the side surface of the driving projection 3 facing the wheel 4. The inclination angle α of the base side portion of the bent portion 3f with respect to the vertical plane is made smaller than the inclination angle γ on the tip portion side.
In this case, the inclination angles α and γ are preferably in the range of 1 ° <γ−α <30 °.

  With this configuration, when the side surface of the driving projection 3 and the side surface of the wheel 4 are in contact with each other, the contact area is made sufficiently small only on the base side of the driving projection 3 and the friction generated when they contact each other. Heat can be reduced.

In addition, an inclined surface that protrudes from the radially outer end position toward the driving projection side is provided on the side surface of the roller wheel 4 that faces the driving projection 3, and the curved surface that is bent in the middle and moves away from the driving projection 3. 4f is provided so that the inclination angle β of the inclined surface of the wheel with respect to the vertical surface perpendicular to the rotation axis of the wheel is smaller than the inclination angle α with respect to the same vertical surface of the base side portion of the driving projection 3.
Here, the inclination angles α and β are preferably set to 1 ° <α−β ≦ 30 °, more preferably 4 ° <α−β <10 °.
The center of the rolling wheel 4 from the folding surface 4f can be located, for example, in a vertical plane orthogonal to the rotation axis of the rolling wheel.

More preferably, in this crawler traveling device, the bent surface of the protrusion-facing surface of the roller wheel 4 is the bent portion 3f of the driving protrusion 3 in a state where the outer peripheral surface of the roller wheel 4 is in contact with the inner peripheral surface of the crawler 1. Accordingly, the roller 4 is provided closer to the rotating shaft.
When the projection height h3 = 64 mm, the height h3f of the bent portion 3f of the driving projection 3 from the crawler body 2 is preferably 20 to 40 mm, and the crawler body 2 is rotated from the base of the driving projection 3 to the base. The height h4f of the folding surface 4f of the ring 4 to the radially outer end is set to 23 to 60 mm.

  With this configuration, the distance between the driving projection 3 and the folding surface 4f of the wheel 4 is increased, and the folding surface 4f of the wheel 4 is difficult to contact the driving projection 3, so that the driving projection 3. Edge-like wear can be suppressed. Further, the base side of the driving projection 3 is worn depending on the use state of the crawler traveling device. Even if such wear occurs, the folding surface 4f of the wheel 4 is separated from the driving projection 3. As a result, it becomes difficult for the roller 4 to get on the upper end corner of the driving projection 3 that has been displaced, and durability is improved.

  Preferably, the inclination angle α of the inclined surface of the wheel with respect to the vertical surface orthogonal to the rotation axis of the wheel 4 and the inclination angle β with respect to the same vertical surface of the base side portion of the driving projection 3 are 1 ° < By setting α−β ≦ 30 °, the heat generation and wear of the driving protrusion 3 can be reduced, and the wheel 4 can be prevented from being removed.

  That is, when α-β is less than 1 °, the driving projection 3 and the wheel 4 come in contact with each other at a location where the relative speed has increased, and thus the heat generation and wear of the driving projection 3 are increased, whereas it exceeds 30 °. Then, when the driving projection 3 and the wheel 4 come into contact with each other, the wheel 4 tends to ride on the inclined surface of the driving projection 3 and be easily removed.

Next, experimental crawler traveling devices I and II of a tractor rubber crawler having a width of 400 mm, a number of protrusions of 40, and a pitch of 127 mm and a comparative example crawler traveling device were prototyped. The durability was evaluated by changing.
In addition, in the comparative example crawler traveling device, the other configurations are based on the example crawler traveling device.

  On an asphalt road surface of an elliptical course, a straight line was continuously run at 35 km / h and a curve was about 20 km / h, and the wear state of the driving protrusion after running was confirmed.

  From the results in Table 2, the Example crawler traveling devices I and II were superior to the comparative example crawler traveling device in that the driving protrusions were less worn, cracked, and superior in durability.

It is a section perspective view showing some embodiments of the present invention. FIG. 2 is a partial cross-sectional view in the crawler width direction showing a relationship between a driving protrusion and a wheel in FIG. 1 in a rolling posture of the wheel on the inner peripheral surface of the crawler. It is a figure which expands and shows a part of FIG. It is a fragmentary sectional view of the crawler width direction which shows a part of conventional crawler device.

Explanation of symbols

1 Crawler 2 Crawler Body 3 Drive Protrusion 4 Rolling Wheel 5 Reinforcement Ply 6 Steel Cord 7 Lug

Claims (2)

Driving protrusions formed at a predetermined pitch in the circumferential direction on the inner peripheral surface of the endlessly extending crawler, and the driving protrusions roll apart in the width direction of the crawler and come into contact with the driving protrusions. In a crawler traveling device provided with a plurality of pairs of rolling wheels,
In the cross section of the driving projection in the crawler width direction, a bent portion located between the protruding base and the protruding tip is provided on the surface of the driving projection facing the wheel, and the base side of the bent portion The inclination angle of the part with respect to the vertical plane is made smaller than that on the tip part side,
In the vertical surface of the wheel, including the rotation axis, an inclined surface that protrudes from the radially outer end position toward the driving projection side is provided on the surface of the wheel facing the driving projection, and is bent in the middle. A folding surface that is away from the driving projection, and the inclination angle of the inclined surface of the wheel with respect to the vertical surface perpendicular to the rotation axis of the wheel is smaller than the inclination angle of the base side portion of the driving projection with respect to the similar vertical surface. and,
A crawler running characterized in that, in a state in which the wheel and the driving protrusion are in contact, a bent surface of the surface facing the protrusion of the wheel is provided closer to the rotating shaft of the wheel than the bent portion of the driving protrusion. apparatus. An inclination angle β of the inclined surface of the wheel with respect to a vertical surface orthogonal to the straight line of the wheel, and an inclination angle α with respect to a similar vertical surface of the base side portion of the driving projection,
1 ° <α-β ≦ 30 °
The crawler traveling device according to claim 1 .

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