JP2020097274A - Elastic crawler - Google Patents

Abstract

To provide an elastic crawler capable of effectively reducing sensible vibration while running.SOLUTION: While a rolling wheel 18 passes on a plurality of protrusion parts 44 formed at a rolling wheel passing surface 30, vibration with a shorter interval than steady vibration corresponding to a pitch of a core metal 32 can be generated; therefore, the vibration with the short interval generated while passing through the protrusion parts 44 is added to the steady vibration and hence an occupant becomes less responsive to the steady vibration generated while the rolling wheel 18 passes on the core metal part. Forming protrusion parts 44 at a position of a maximum amplitude value of upward excited vibration and/or forming the protrusion part 44 at a position of a minimum amplitude value of downward excited vibration can reduce an absolute value of an amplitude extreme value of synthesized excited vibration.SELECTED DRAWING: Figure 3

Description

The present invention relates to an elastic crawler, and more particularly to an elastic crawler in which cored bars are embedded at a predetermined pitch in the circumferential direction of a crawler body.

Elastic crawlers are, for example, rubber endless tracks, and have been actively researched and developed since they were first developed as undercarriage parts for agricultural equipment, and are now widely used for various purposes. Is also diverse. When this elastic crawler is used, for example, in the underbody parts of agricultural equipment, the crawler body is formed on the outer peripheral surface of the crawler body in the form of an endless belt to improve the rough terrain running performance of the machine body by the elastic crawler, so-called traction force. In some cases, the lugs extending substantially in the width direction may be provided at regular intervals in the circumferential direction of the crawler main body. Further, on the inner peripheral surface of the crawler main body, a rolling wheel passing surface through which the rolling wheels of the machine body abut and pass when the crawler main body is on the ground side is continuously formed in the circumferential direction of the crawler main body. ing. In addition, a cored bar extending in the width direction of the crawler body may be embedded inside the crawler body at a predetermined pitch in the circumferential direction of the crawler body.

An example of such an elastic crawler is described in Patent Document 1 below. This elastic crawler is an inclined surface that inclines the outer side in the width direction of the crawler main body from the rolling wheel passage surface of the inner peripheral surface of the crawler main body toward the grounding side, and the outer end in the width direction of the crawler main body in the thickness direction of the crawler main body. It is designed to be the same as the tensile body (steel cord) or to be located on the ground side. According to this elastic crawler, the mud attached to the inner peripheral surface of the crawler body is easily peeled off and is easily discharged in the width direction of the crawler main body along the inclined surface. It says that it can avoid the occurrence of muddy balls.

JP, 2007-55526, A

By the way, when such an elastic crawler is mounted as a suspension part of a self-propelled agricultural machine such as a combine, improvement of riding comfort during traveling, specifically, reduction of bodily vibration is an issue. More specifically, in elastic crawlers for self-propelled agricultural equipment, a cored bar is often embedded at a predetermined pitch in the circumferential direction of the crawler main body, and the crawler part is provided in the part with and without the cored part. A difference occurs in the rigidity of the main body portion, and the rolling wheel passing through the rolling wheel passage surface falls, for example, at the portion without the core metal and is pushed up at the portion with the core metal, which causes vibration. There is a demand for an elastic crawler capable of effectively reducing the vibrations generated in this way, especially the bodily vibrations that are felt as a ride comfort.

The present invention has been made in view of the above problems, and an object thereof is to provide an elastic crawler that can effectively reduce body vibration during traveling.

In order to achieve the above object, the elastic crawler according to claim 1,
An endless belt-shaped rolling wheel passage surface which is formed continuously in the circumferential direction of the inner circumferential surface and through which the rolling wheels contact and passes, and is embedded in the circumferential direction at a predetermined pitch and extends in the width direction. In the elastic crawler including the core metal, a plurality of convex portions having a circumferential interval smaller than a circumferential pitch of the core metal are formed on the rolling wheel passage surface.

According to this configuration, when the rolling wheels pass through the plurality of convex portions formed on the rolling wheel passage surface, vibrations at intervals shorter than the vibrations according to the pitch of the cored bar may occur. For example, in self-propelled agricultural equipment such as combine harvesters, the core metal is embedded at a predetermined pitch, and the occupant feels a steady vibration that occurs when the rolling wheels pass through the core metal part of the crawler body. .. When the vibration of the convex portion at a relatively short interval is added to the steady vibration, the occupant hardly feels the steady vibration accompanying the passage of the cored bar portion of the rolling wheel. Further, it is possible to reduce the amplitude of the vibration accompanying the passage of the cored bar portion of the roller by the vibration associated with the passage of the convex portion of the roller. Therefore, the sensory vibration during traveling is effectively reduced with a relatively simple configuration.

The elastic crawler according to a second aspect is the elastic crawler according to the first aspect, characterized in that a concave portion is formed in a portion other than the convex portion of the rolling wheel passage surface. The concave portion may be regarded as a concave portion, for example, a concave portion between the convex portion and the convex portion, and, for example, when the convex portion is provided so as to project from a plane which is a reference of the wheel passing surface, The flat surface may be recessed to form a recess.

According to this configuration, when the rolling wheel passes through the concave portion formed on the rolling wheel passage surface, vibration in a phase opposite to that of the convex portion, specifically, downward vibration can occur. For example, since the vibration generated when the wheel passes through the cored bar portion is the vibration applied to the upper part of the airframe or the occupant, if a recess is formed in this part, the amplitude of the vibration due to the passage of the cored bar portion is reduced. It is possible to make it smaller. As a result, the sensory vibration during traveling is reliably reduced.

An elastic crawler according to a third aspect is the elastic crawler according to the second aspect, characterized in that the convex portion and the concave portion are smoothly and continuously formed.

According to this structure, the upward vibration when the rolling wheel passes through the convex portion and the downward vibration when passing through the concave portion are smoothly continued. By combining it with the vibration that occurs when the vehicle passes, it is possible to further reduce the sensory vibration during traveling.

An elastic crawler according to a fourth aspect is the elastic crawler according to any one of the first to third aspects, wherein the convex portion has a gentle mountain shape.

According to this structure, the vibration applied upward when the wheel passes through the convex portion does not suddenly change, and the vibration felt during running can be reduced accordingly.

According to a fifth aspect of the present invention, in the elastic crawler according to the second or third aspect, the concave portion has a gentle valley shape.

According to this configuration, the downward vibration when the wheel passes through the concave portion does not suddenly change, and the sensation vibration during traveling can be reduced accordingly.

The elastic crawler according to claim 6 is the elastic crawler according to any one of claims 1 to 5, wherein the rolling wheel passage surface is formed in the state where the convex portion or the convex portion and the concave portion are removed. The vibration wave when the rolling wheel passes is a core metal vibration wave, and in the state where the core metal is removed and the convex portion or the convex portion and the concave portion of the rolling wheel passage surface are When the vibration wave when the rolling wheel passes is a rolling wheel passing wave, the amplitude of the composite wave of the core bar vibration wave and the rolling wheel passing wave is smaller than the amplitude of the core bar vibration wave alone. It is characterized in that the convex portion or the convex portion and the concave portion are formed.

According to this configuration, for example, by forming the convex portion before and after the maximum amplitude value of the upward vibration of the core metal vibration wave, the absolute value of the combined maximum amplitude value of the upward vibration of the vibration is formed. Can be made small, and by forming a convex portion at the position of the minimum amplitude value of the downward vibration of the core metal vibration wave, the absolute value of the minimum amplitude value of the combined downward vibration of the vibration can be Can be made smaller, and the amplitude of the composite wave can be made smaller than the amplitude of the core metal vibration wave alone by either or both of them to reduce the body vibration during traveling.

As described above, according to the present invention, by adding the vibration at a short interval when the rolling wheel passes through the convex portion to the steady vibration when the rolling wheel passes through the cored bar, The sensible amount of vibration associated with the passage of the cored bar portion of the wheel is reduced, whereby the sensible vibration during traveling can be effectively reduced, and thus the riding comfort can be improved.

FIG. 1 is a front view of an elastic crawler according to an embodiment of the present invention in a machine body attached state. FIG. 2 is a cross-sectional view taken along the line AA of the elastic crawler of FIG. 1. FIG. 2 is a detailed view of a rolling wheel passage surface of the elastic crawler of FIG. 1. It is explanatory drawing of the effect|action by the elastic crawler of FIG. It is explanatory drawing of the effect|action by the modification of the elastic crawler of FIG. FIG. 8 is a detailed view of a roller passing surface showing another modified example of the elastic crawler of the present invention. It is a detailed view of a rolling wheel passage surface showing a further modification of the elastic crawler of the present invention. FIG. 8 is a detailed view of a rolling wheel passage surface showing another modified example of the elastic crawler of the present invention. FIG. 8 is a detailed view of a rolling wheel passage surface of a conventional elastic crawler having no convex portion.

Hereinafter, an embodiment of an elastic crawler of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a state in which an elastic crawler 10 of this embodiment is attached to a frame (machine body) 12. The elastic crawler 10 of this embodiment is a rubber endless track band used as a foot part of a self-propelled agricultural machine such as a combine or a tractor. The elastic crawler 10 is wound around the drive wheel 14 and the idler wheel 16 at both ends (front and rear ends in the traveling direction).

The drive wheel 14 is, for example, a gear type sprocket, and is rotationally driven by a drive source (not shown). The drive wheel 14 is constructed by connecting a sprocket body 14a to a drive source (not shown) via a rotary shaft 14b. In addition, the idler wheel 16 is configured by rotatably supporting the disk-shaped main body portion 16a by the rotation shaft 16b. In the lower part between the drive wheel 14 and the idler wheel 16, that is, on the side of the moving road surface, a plurality of, in the figure, three rolling wheels 18 are arranged. The rolling wheel 18 is configured by connecting two flange portions 18a with a rotating shaft 18b. It should be noted that lugs 42 extending substantially in the width direction of the crawler body 28 are formed on the outer peripheral surface 28b of the elastic crawler 10 (crawler body 28) at equal intervals in the circumferential direction, but in FIG. , Only a part thereof is shown, and the entire outer shape is shown by a chain double-dashed line.

FIG. 2 is a sectional view of the elastic crawler 10 of FIG. The main body of the elastic crawler 10 which is the endless track is composed of an endless belt-shaped rubber crawler body 28. In the endless belt-shaped crawler body 28, a large number of steel cords 24 are embedded in parallel along the circumferential direction of the crawler body 28 at the position indicated by the alternate long and short dash line in FIG. A claw-shaped protrusion 34 as shown in FIG. 2, for example, is formed on the inner peripheral surface 28a of the crawler body 28 at the center of the crawler body 28 in the width direction. The protrusions 34 are, for example, two pairs of rubber-coated claw-shaped protrusions arranged in the left-right direction of FIG. 2, that is, in the width direction of the crawler body 28. The protrusion 34 meshes with the teeth of the gear-type drive wheel 14 described above, and at the same time, is sandwiched between the two flange portions 18 of the roller wheel 18 to guide the roller wheels 18. Therefore, of the inner peripheral surface 28a of the crawler body 28, the two flange portions 18a of the roller 18 contact (rotate) one by one on both sides of the protrusion 34 in the width direction of the crawler body. ) Passing through is formed continuously in the circumferential direction of the crawler body 28. That is, the rolling wheel passage surfaces 30 are formed on the inner peripheral surface 28a of the crawler main body 28 at predetermined intervals in the width direction of the crawler main body 28 in a continuous manner in the circumferential direction of the crawler main body 28.

As shown in FIG. 1, the protrusions 34 are arranged at equal intervals in the circumferential direction of the crawler main body 28, and cores 32 are disposed at the positions of the protrusions 34 as shown in FIG. Has been done. The cored bar 32 has left and right wing portions facing both sides in the width direction of the crawler body 28, and a protrusion included in the protrusion 34 is formed at the center in the width direction. Further, a rubber lug 42 is also formed on the outer peripheral surface 28b of the crawler body 28 so as to integrally project with the crawler body 28, as will be described later in detail. These lugs 42 act on the moving road surface, for example, scrape off rough terrain such as mud, and are spaced at a predetermined interval in the circumferential direction of the crawler body 28, specifically, on the inner circumferential surface 28a side. It is formed so as to project from the outer peripheral surface 28 b of the crawler body 28 at a position facing the protrusion 34. That is, the lug 42 of this embodiment is provided so as to project from the portion of the cored bar 32 embedded in the crawler body 28.

The elastic crawler 10 is entirely made of a rubber material so as to include the steel cord 24 and the core 32 described above, and the protrusion 32 and the lug 42 are integrally formed with the crawler body 28. As such a rubber material, for example, a rubber material containing an ethylene-propylene-diene rubber having excellent weather resistance can be applied. Further, in the case of defining the hardness of the rubber material, that is, the so-called rubber hardness, the hardness is measured according to the durometer hardness test defined in JIS K6253 using a type A tester under room temperature conditions of 20°C. ..

As described above, in this embodiment, the lug 42 is formed so as to project from the outer peripheral surface 28b of the crawler main body 28 so as to face the protrusion 34 on the inner peripheral surface 28a side of the crawler main body. These lugs 42 are divided on both sides in the width direction of the crawler body by a spacing portion 36 provided at the center of the width direction of the crawler body. Since the bottom portion of the separation portion 36 is located on the outer peripheral surface 28b of the crawler body portion 28, the lugs 42 on both sides in the width direction of the crawler body portion are all complete except for the portion connected by the crawler body portion 28 itself. Are separated by. By doing so, the cross-sectional area (that is, the space) of the spacing portion 36 in the cross section that is parallel to the width direction of the crawler main body 28 and is orthogonal to the circumferential direction of the crawler main body 28 can be increased, and as a result, The effect of reducing the amount (volume) of mud cut off from the moving road surface by the lugs 42 when moving on uneven terrain such as mud, for example, reducing the amount of mud that tends to become clogged between the lugs 42 that are adjacent in the circumferential direction of the crawler body, In other words, improvement of the mud separation property can be expected. Some combine harvesters do not have this gap.

FIG. 3 is a detailed view of the rolling wheel passage surface 30 of the elastic crawler 10 in this embodiment. The rolling wheel passage surface 30 of this embodiment is formed with gentle mountain-shaped convex portions 44 at regular intervals, in this case, at regular pitches. In addition, between the adjacent convex portions 44, gentle valley-shaped concave portions are formed continuously with the convex portions 44. That is, in this embodiment, the gentle mountain-shaped convex portions 44 and the depressions between the convex portions 44 are the gentle valley-shaped concave portions 46. The interval (pitch) of the convex portions 44 is smaller than the pitch of the cored bar 32. The convex portion 44 (including the concave portion 46) is made of the same rubber material as that of the crawler body portion 28 and is formed integrally with the crawler body portion 28.

Since the interval (pitch) of the convex portions 44 is smaller than the pitch of the cored bar 32, when the rolling wheels 18 pass through the convex portions 44 (including the concave portion 46), vibration acting on the machine body 12 or an occupant is The interval is shorter than the vibration that acts on the machine body 12 or an occupant when the rolling wheels pass through the cored bar 32. FIG. 4 is an explanatory diagram of the operation of the elastic crawler 10 of FIG. The displacement shown in the graph is the displacement of the vibration of the roller 18, and the direction in which the roller 18, that is, the machine body 12 moves upward is positive (+), and the direction in which the roller 18 or the machine body 12 moves downward is positive. It was defined as negative (-).

In FIG. 4, for example, the vibration wave when the rolling wheels 18 pass through the rolling wheel passage surface 30 in a state where the convex portions 44 (including the concave portions 46) are removed from the elastic crawler 10 of FIG. In this case, the core bar vibration wave appears as shown by the broken line in FIG. 4 (the position of the core bar 32 is schematically shown in the figure). Further, a vibration wave when the rolling wheels 18 pass through a portion of the rolling wheel passage surface 30 where the convex portions 44 (including the concave portions 46) are formed in a state where the lugs and the cored bar are removed from the crawler body portion 28. Is a rolling-wheel passing wave, the rolling-wheel passing wave appears as shown by a chain double-dashed line in FIG. 4 (the positions of the convex portion 44 and the concave portion 46 are schematically shown in the drawing). The vibration that actually acts on the machine body 12 or the occupant becomes a composite wave of the core bar vibration wave and the wheel passing wave, and this composite wave is shown by a solid line in FIG. For example, from FIG. 4, it is preferable that the pitch is 2/3 of the core bar pitch, because the peak of the core bar vibration wave in FIG. 4 is canceled. In addition, the pitch of the convex portions 44 can be appropriately set so as to cancel the core bar vibration wave. In addition, the wheel passing wave by the convex portion 44 can change the wavelength and the phase with respect to the core metal vibration wave, but can be appropriately set so as to cancel the peak of the core metal vibration wave in FIG. It should be noted that all of these vibration waves are theoretical values that do not take into consideration the condition of the traveling road surface and the traveling speed condition.

Since the protrusions 34 including the protrusions of the cored bar 32 mesh with the teeth of the drive wheel 14 made of a sprocket, the cored bars 32 are embedded in the crawler body 28 at a constant pitch. As described above, the rigidity of the crawler main body 28 is different between the portion with the cored bar 32 and the portion without the cored bar 32. 18 falls downward and is pushed up at a portion where the cored bar 32 is present, which causes vibration. The core bar vibration wave is, for example, as shown in FIG. 9, a vibration wave generated when the rolling wheels 18 pass through a flat rolling wheel passage surface 30 having no convex portions or concave portions. The portion of the core metal vibration wave that is convex in the figure is the vibration when the roller 18 rides on the core metal 32, and vibrates the machine body 12 and the occupant upward. On the other hand, the downward convex portion of the core metal vibration wave is the vibration when the wheel 18 falls from the core metal 32, and vibrates the machine body 12 and the occupant downward. Specifically, the burying pitch of the cored bar 32 is about 70 to 100 mm in the circumferential direction of the crawler body 28, and the traveling speed of the combine at the time of mowing is 1 to 2 m/s, for example.

In this embodiment, the convex portion 44 is formed before and after the maximum amplitude value of the oscillation vibration of the core metal vibration wave, that is, the concave portion 46 is formed at the position of the maximum amplitude value. The absolute value of the maximum amplitude of the upward vibration of the composite wave of the wheel passing waves is smaller than the absolute value of the maximum amplitude of the upward vibration of the core metal vibration wave. Similarly, in this embodiment, by forming the concave portion 46 at the position of the maximum amplitude value of the downward vibration of the core bar vibration wave, that is, by forming the convex portion 44 before and after the minimum amplitude value, The absolute value of the minimum amplitude of the downward vibration of the vibration wave and the wave that passes through the wheel is smaller than the absolute value of the maximum amplitude of the downward vibration of the core metal vibration wave. .. As described above, by appropriately setting the formation position of the convex portion 44 (including the concave portion 46) formed on the wheel passing surface 30, it is possible to reduce the amplitude of the core bar vibration wave, and thereby to reduce the amplitude during traveling. It is possible to reduce body vibration.

This wheel passing wave can be set as follows. For example, in FIG. 4, the mandrel vibration wave is generated when the rolling wheel 18 falls between the mandrels 32 and runs on the mandrel 32. The reason why the displacement of the rolling wheels 18 becomes a vibration as shown by a sine wave in the figure is that the machine body 12 is moving at a constant speed with respect to the elastic crawler 10. It can be considered that the rigidity of the elastic crawler 10 in the portion where the cored bar 32 is present is constant or almost constant. Therefore, the rolling wheel passing wave that is combined with this core bar vibration wave and suppresses the vibration of vibration applied to the lower part of the core bar is generated at the portion without the core bar 32, that is, the end of the core bar 32 in the circumferential direction of the crawler body. A vibration waveform having a starting point and an end point at an end portion in the circumferential direction of the crawler body of the adjacent core metal 32 is mainly used. However, in reality, when the rolling wheel 18 comes off from the core metal 32, the rolling wheel 18 does not immediately fall, but the rolling wheel 18 should fall after being slightly separated from the core metal 32. Since the rolling wheel 18 should be pushed up slightly from the front side of the core metal 32, a rolling waveform is obtained such that the starting point is the point where the rolling wheel 18 actually starts to fall and the ending point is the point where the rolling wheel 18 begins to be pushed up. The passing wave is set, that is, the convex portion 44 and the concave portion 46 are arranged.

FIG. 5 is an explanatory diagram of the operation of the modified example of the elastic crawler of FIG. Also in this figure, the core bar vibration wave is shown by a broken line and the wheel passing wave is shown by a chain double-dashed line, and the positions of the core bar 32 and the positions of the protrusions 44 (including the recesses 46) are also schematically shown. In this modified example, the protrusions 44 (including the recesses 46) are formed on the rolling wheel passage surface 30 at an interval much shorter than the interval of arrangement of the cored bar 32 than the interval of arrangement of FIG. .. With the composite wave of the core bar vibration wave and the wheel passing wave in this modification, it is difficult to obtain the action of reducing the amplitude of the core bar vibration wave, but it is necessary to add the wheel passing wave having a shorter cycle than the core bar vibration wave. Thus, there is an advantage that it is difficult for an occupant to experience a stationary core metal vibration wave, and as a result, an effect that the body vibration during traveling is reduced can be obtained.

As described above, in the elastic crawler of the present embodiment, not only when the amplitude of the core metal vibration wave is substantially reduced, but also by adding the rolling wheel passing wave of a short cycle to the stationary core metal vibration wave. The effect of reducing the sensory vibration during traveling can be obtained. Therefore, not only the embodiment shown in FIG. 3 and the modification shown in FIG. 5 but also the following modifications can be cited as embodiments. That is, as in another modified example shown in FIG. 6, a plurality of convex portions 44 may be locally provided on the wheel passing surface 30 at intervals smaller than the pitch of the cored bar 32. In this example, the convex portion 44 has a rectangular cross section. In this example, for example, the convex portion 44 is formed so as to protrude from the plane that is the reference of the wheel passing surface 30. Further, as in the further modified example shown in FIG. 7, the concave portion 46 may be formed in a portion other than the convex portion 44 of the rolling wheel passing surface 30. In this example, both the convex portion 44 and the concave portion 46 have a rectangular cross section. In this example, the convex portion 44 is formed so as to protrude from the reference flat surface of the rolling wheel passage surface 30, and the concave portion 46 is formed so that the reference flat surface of the rolling wheel passage surface 30 is recessed. Further, as in another modification shown in FIG. 8, the convex portion 44 and the concave portion 46 may be formed smoothly and continuously. In this example, both the convex portion 44 and the concave portion 46 have a triangular cross section. In this example, since the convex portions 44 and the concave portions 46 having a triangular cross section are smoothly formed continuously, for example, the concave portion 46 is formed between the adjacent convex portions 44 and the convex portions 44.

As described above, in the elastic crawler 10 according to the present embodiment, when the rolling wheels 18 pass through the plurality of convex portions 44 formed on the rolling wheel passing surface 30, the steady vibration according to the pitch of the cored bar 32 is generated. Since vibrations with a shorter interval can occur, vibrations with a shorter interval passing through the convex portion 44 are added to this steady vibration, so that the occupant does not receive a steady vibration accompanying the passage of the cored bar portion of the roller 18. Vibration is less likely to be felt. Further, as described above, it is also possible to reduce the amplitude of the vibration associated with the passage of the core of the roller 18 by the vibration associated with the passage of the convex portion of the roller 18. Therefore, in the elastic crawler 10 of the embodiment, the sensible vibration during traveling is effectively reduced by the relatively simple configuration.

Further, by forming the concave portion 46 in a portion other than the convex portion 44 of the rolling wheel passage surface 30, when the rolling wheel 18 passes through the concave portion 46 formed in the rolling wheel passage surface 30, the convex portion 44 and the convex portion 44 have an opposite phase. Vibration, that is, downward vibration, may occur. For example, the vibration that occurs when the roller 18 passes through the cored bar portion is the upward vibration of the body 12 or the occupant. By forming the, it is possible to reduce the amplitude of vibration accompanying the passage of the cored bar. As a result, body vibration during traveling is further reduced.

Further, by smoothly and continuously forming the convex portion 44 and the concave portion 46, the upward vibration when the rolling wheel 18 passes the convex portion 44 and the downward vibration when the rolling wheel 18 passes the concave portion 46 are smooth. By combining this with the vibration that occurs when the rolling wheel 18 passes through the cored bar portion, it is possible to further reduce the sensory vibration during traveling.

In addition, by forming the convex portion 44 in a gentle mountain shape, the upward vibration when the roller 18 passes through the convex portion 44 does not suddenly change, and the sensation vibration during traveling is correspondingly increased. It can be reduced.

Further, by forming the concave portion 46 in a gentle valley shape, the downward vibration when the roller 18 passes through the concave portion 46 does not suddenly change, and the sensation vibration during traveling is reduced accordingly. be able to.

Further, for example, by forming the convex portion 44 before and after the maximum amplitude value of the upward vibration of the core metal vibration wave, the absolute value of the combined maximum amplitude value of the upward vibration of vibration is reduced. By forming the convex portion 44 at the position of the minimum amplitude value of the downward vibration of the core metal vibration wave, the absolute value of the combined minimum amplitude value of the downward vibration of vibration can be reduced. The amplitude of the composite wave can be made smaller than the amplitude of the core metal vibration wave alone by using these or both of them to reduce the body vibration during traveling.

The elastic crawlers according to the embodiments have been described above, but the present invention is not limited to the configurations described in the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, the size and shape of the convex portion 44 (including the concave portion 46), the protruding size, the material, and the protruding position are appropriately set according to the desired vibration (rolling wheel passing wave) that occurs when the convex portion passes. do it.

Further, in the above embodiment, the elastic crawler 10 in which the lug 42 and the cored bar 32 are arranged at the same position in the circumferential direction of the crawler body 28 has been described, but the lug and the cored bar are arranged in the circumferential direction of the crawler body. Some elastic crawlers are offset. When the lug 42 and the cored bar 32 are arranged at the same position in the circumferential direction of the crawler main body 28 as in the above-described embodiment, the convex portion 44 (including the concave portion 46) of the rolling wheel passing surface 30 is included. Although the effect of reducing the sensory vibration is great, the sensory vibration can be reduced by providing the convex portion (including the concave portion) on the rolling wheel passage surface even when the two are deviated from each other.

Further, in the above embodiment, the example in which the convex portions 44 (including the concave portions 46) are periodically arranged on the rolling wheel passage surface 30 has been described, but the convex portions (including the concave portions) are arranged in a periodic array. You don't have to. However, when the protrusions (including the recesses) are integrally formed with the crawler body by the same rubber material, it is easier to manufacture the protrusions (including the recesses) arranged periodically.

10 Elastic Crawler 18 Rolling Wheel 28 Crawler Main Body 30 Rolling Wheel Passing Surface 32 Core Bar 42 Lug 44 Convex 46 Concave

Claims (6)

An endless belt-shaped rolling wheel passage surface which is formed continuously in the circumferential direction of the inner circumferential surface and through which the rolling wheels contact and passes, and is embedded in the circumferential direction at a predetermined pitch and extends in the width direction. In an elastic crawler having a core bar to
An elastic crawler characterized in that a plurality of convex portions having a circumferential interval smaller than a circumferential pitch of the cored bar are formed on the rolling wheel passage surface. The elastic crawler according to claim 1, wherein a concave portion is formed in a portion other than the convex portion of the rolling wheel passage surface. The elastic crawler according to claim 2, wherein the convex portion and the concave portion are formed smoothly and continuously. The elastic crawler according to any one of claims 1 to 3, wherein the convex portion has a gentle mountain shape. The elastic crawler according to claim 2 or 3, wherein the concave portion has a gentle valley shape. A vibration wave when the rolling wheel passes through the rolling wheel passing surface in a state where the convex portion or the convex portion and the concave portion are removed is a core bar vibration wave, and the core bar is removed and When the vibration wave when the rolling wheel passes through the convex portion or the portion where the convex portion and the concave portion are formed on the rolling wheel passing surface is a rolling wheel passing wave, the core metal vibration wave and the rolling wave 6. The convex portion or the convex portion and the concave portion are formed such that the amplitude of a composite wave of the ring passing wave is smaller than the amplitude of the core metal vibration wave alone. An elastic crawler according to item.

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