JP6429607B2 - Rubber crawler belt - Google Patents

Description

  The present invention relates to an endless belt-like rubber crawler belt that is attached to a crawler type traveling device such as a combine, a crawler type tractor, a backhoe or the like.

  Lugs are formed at a predetermined pitch on the outer peripheral side of the rubber crawler belt mounted on the crawler type traveling device, and on the inner peripheral side of the rubber crawler belt, a group of protrusions that mesh with the drive wheels of the crawler type traveling device and A rolling wheel running surface extending in the crawler running direction on both sides of the projection group is formed. For example, in the rubber crawler according to Patent Document 1, a large number of depressions or sipes are formed in the high rigidity portion corresponding to the lugs in the vicinity of the protrusions on the running surface of the rollers of the crawler belt body. In other words, in this rubber crawler belt, since the wheel running surface is formed to be relatively thick and has high rigidity, by forming a recess or sipe in the wheel running surface, the rigidity is reduced, Driving vibration is reduced. At this time, no depressions or sipes are formed on the surface located on the outer side in the width direction of the crawler belt from the wheel running surface.

  Moreover, in the rubber crawler belt according to Patent Document 2, a built-up portion extending in the width direction of the crawler belt is provided between adjacent lugs formed on the outer peripheral side, and the crawler belt as a whole is formed on the surface of the built-up portion. A sipe that is a groove extending in the width direction is formed. That is, in this rubber crawler belt, a sipe is formed in the built-up portion formed in the central region of the outer peripheral surface of the rubber crawler belt provided with the lug. As a result, good vibration characteristics are being obtained. At that time, the sipe is not formed in the thin outer end region outside the central region (substantially the region facing the protrusion and the wheel running surface) in the width direction of the crawler belt, and is flat. The surface remains.

JP 2005-271712 A Japanese Patent Application Laid-Open No. 2014-118045

In the above-described conventional rubber crawler belt, grooves and sipes are formed between adjacent lugs which are the wheel running surface which is the central region of the inner peripheral surface of the crawler belt and the central region of the outer peripheral surface of the crawler belt to reduce the elasticity. The design, vibration characteristics, etc. are improved. However, in any case, the surface of the outer end region located on the left and right of the central region on the inner peripheral surface of the crawler belt remains flat. As a result, the bending rigidity generated when the rubber crawler belt meshes with the driving wheel and the driven wheel becomes relatively large, and a driving loss due to this has occurred.
Accordingly, an object of the present invention is to provide a rubber crawler belt having a structure that reduces bending rigidity when meshing with a driving wheel or a driven wheel.

A rubber crawler belt according to the present invention includes an endless belt-like rubber crawler belt main body, a lug group formed on the outer peripheral side of the crawler belt main body, and a widthwise central side of the crawler belt main body extending along the circumferential direction. A group of protrusions formed on the inner peripheral side of the belt central region, and a wheel running surface formed on the inner peripheral surface of a pair of left and right belt first regions located on both sides in the width direction of the belt central region, A pair of left and right belt second regions located on the outer side in the width direction of the belt first region, and a recess group formed on the inner peripheral surface of the belt second region, and the lug constituting the lug group is a lateral width of the crawler belt main body Is formed from the outer end on one side to the outer end on the other side in the direction, and the width of the lug in the circumferential direction is larger than the length between the adjacent rising edges in the adjacent lugs. Ku is configured, the depressions includes a plurality of grooves arranged in the circumferential direction extend in the width direction of the crawler belt main body, the width of the groove in the circumferential direction is shorter than the width of the lugs in the circumferential direction Formed on the inner peripheral surface of the belt second region, a plurality of the grooves are formed in a portion corresponding to the adjacent rising edges between the adjacent lugs, and the portion corresponding to the lug Grooves are formed.

  In the rubber crawler belt configured as described above, since the bending rigidity is low due to the concave portions formed on the inner peripheral side, the rubber crawler belt is engaged with the crawler driving wheel body or the crawler tension wheel body of the crawler type traveling device. The crawler belt can bend smoothly along the meshing arc locus of the crawler driving wheel and the crawler tension ring. As a result, the rubber crawler belt according to the present invention reduces the drive loss compared to the rubber crawler belt having high bending rigidity. Further, since the concave group is formed only in a region that is separated outward in the width direction from the wheel running surface on which the wheel runs, there is no adverse effect on the wheel running performance.

  In one preferred embodiment according to the present invention, the plurality of grooves extend from a boundary region between the belt first region and the belt second region to an outer end of the belt second region and face outward in the width direction. Open. Thereby, the bending rigidity which makes the width direction of a rubber crawler belt a bending line falls, and the curve along a meshing arc with a crawler drive wheel of a rubber crawler belt or a crawler tension ring becomes smooth. The extending shape of the groove at that time may be a wave shape or a saw blade shape, but the groove is preferably rectangular, triangular, or linearly extending in a circular cross section because of ease of bending and processing.

  Since it is desirable to form a plurality of grooves between the lugs formed on the outer peripheral side, it is preferable that the groove formation pitch is 1/4 to 1/10 of the lug pitch, which is the lug formation pitch. is there. According to this, several grooves are formed between each lug, and the rubber crawler belt can bend smoothly along the meshing arc of the crawler driving wheel and the crawler tension ring.

  Since the strength of the rubber crawler belt itself may be increased when the depth of the recess group is increased, in one preferred embodiment of the present invention, the depth of the recess group is set to the belt second region. The thickness is 1/4 to 3/4. Thereby, the intensity | strength and bending rigidity of a suitable rubber crawler belt are obtained.

  In a preferred embodiment of the present invention, a plurality of sipes extending in the width direction of the crawler belt main body are formed on the outer peripheral surface located between the lugs constituting the lug group. Due to the sipe formed in the region between the lugs on the outer peripheral surface of the rubber crawler belt, the sipe spreads when passing through the crawler driving wheel or the crawler tension wheel, and mud or the like clogged in the region between the lags is easily dropped. In particular, as the length of the sipe increases, the effect of dropping mud or the like tends to increase. Therefore, it is preferable to form the sipe on a zigzag.

  In one preferred embodiment of the present invention, the protrusion group is a metal core protrusion provided on a plurality of metal cores embedded in the crawler belt main body. When the core metal protrusion substrate is embedded in the inner peripheral surface of the crawler belt main body, the crawler belt main body tends to be thick, so that the formation of the concave group according to the present invention becomes more effective.

It is a side view of a combine carrying a crawler type travel device which adopted a rubber crawler belt by the present invention. It is a side view which shows the crawler type traveling apparatus on the left side. It is sectional drawing along the cross direction in one Embodiment of the rubber crawler belt by this invention. It is a perspective view which shows a part of rubber crawler belt. It is a perspective view which shows a part of rubber crawler belt in another embodiment. It is a perspective view which shows the modification of another embodiment shown by FIG. It is a perspective view which shows the sipe formed between adjacent lugs. It is a top view which shows a part of lug group in another embodiment. It is a schematic diagram which shows the relationship between a wheel and a protrusion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an entire combine equipped with a rubber crawler belt 5 according to an embodiment of the present invention. As shown in FIG. 1, the combine is driven by a driving force from a pair of left and right crawler type traveling devices 1 and an engine (not shown) provided below the driver seat 2. And a traveling aircraft configured to self-run. A threshing device 4 and a grain tank 9 are provided at the rear of the machine frame 3 of the traveling machine body. The front part of the body frame 3 is provided with a cutting part 10 extending to the front part of the threshing device 4 in the longitudinal direction of the body.

  This combine performs harvesting work such as rice and wheat by running the traveling machine with the cutting unit 10 in the descending work state.

  The mowing unit 10 includes a feeder 11 extending from the front part of the threshing device 4 so as to be swingable up and down, and a mowing frame 12 connected to the front part of the feeder 11. As a result, the cutting frame 12 can be switched between a lowered working state that is lowered near the ground and a raised non-working state that is raised higher from the ground.

  The harvesting unit 10 is a pair of left and right dividers 14 that weeds the planted cereals into a target for harvesting and a target for non-pruning, and the tip side of the planted corns that are to be harvested from the divider 14 above the transverse auger 15. A rotary reel 16 that scrapes and a clipper-shaped mowing device 17 that cuts the stock side of the planted cereal to be harvested from the divider 14 are provided. The whole of the harvested cereal from the cutting device 17 to the tip is laterally fed to the front of the feeder 11 by the lateral feed auger 15, and the harvested cereal from the lateral feed auger 15 is supplied to the threshing device 4 by the feeder 11. .

  The threshing device 4 throws the whole of the harvested cereal culm from the feeder 11 into the handling chamber (not shown) into the handling chamber (not shown), and the handling cylinder 4a that is driven to rotate around the handling cylinder axis in the front-rear direction of the traveling machine body. Threshing process by. The grain tank 9 collects and stores the threshed grains conveyed from the threshing device 4. The threshing grains stored in the grain tank 9 are configured to be taken out by the vertical screw conveyor 6A and the horizontal screw conveyor 6B.

A pair of left and right crawler type traveling devices 1 will be described.
Since the left and right crawler type traveling devices 1 have substantially the same configuration, the illustration of the right crawler type traveling device 1 is omitted here.
FIG. 2 is a side view showing the entire crawler type traveling device 1 on the left side. As shown in FIG. 2, the crawler type traveling device 1 includes a track frame 21 connected to the body frame 3 via a connection frame 20, a crawler driving wheel body 22 positioned in front of the track frame 21, and a track frame 21. And a crawler tension ring body 23 provided at the rear end portion. Between the crawler tension ring body 23 and the crawler driving wheel body 22, grounding rolling wheels 24 and 26 and an upper guide wheel body 25 arranged in the longitudinal direction of the machine body are attached to the track frame 21. The rubber crawler belt 5 is wound around all the ring bodies 22, 23, 25 and the grounding rollers 24, 26.

  As shown in FIGS. 2 and 3, the track frame 21 includes an upper track frame 21 a and a lower track frame 21 b that are connected side by side in the vertical direction of the machine body. The crawler driving wheel body 22 is supported by a transmission case 31 (see FIG. 1) attached to the front portion of the machine body frame 3 and receives power from an output shaft (not shown) extending from the transmission case 31.

Among the grounded wheels 24 and 26, the plurality of other grounded wheels 24 other than one grounded wheel 26 includes an outer roller 24a and an inner wheel 24b arranged in the lateral direction of the machine body as shown in FIG. ing. The grounding roller 24 guides the rubber crawler belt 5 with the projection group 70 protruding toward the inner peripheral surface of the rubber crawler belt 5 sandwiched between the outer roller 24a and the inner roller 24b.

  The rubber crawler belt 5 is arranged along the longitudinal direction (circumferential direction) of the crawler belt main body 50 formed by molding a rubber material into an endless belt shape, as shown in FIGS. 3 and 4. And a plurality of core bars 7 embedded and held on the inner peripheral surface side of the crawler belt main body 50 in a state of being spaced apart from each other. The core metal 7 includes a plate-shaped core metal substrate 72 and a pair of left and right core metal protrusions 71. The pair of left and right cored bar protrusions 71 protrude upward in the horizontal width direction of the rubber crawler belt 5 in the central region of the upper surface of the cored bar substrate 72. The projection group 70 is a plurality of cored bar projections 71 arranged at a predetermined pitch (projection pitch) in the longitudinal direction of the crawler belt main body 50. Hereinafter, the core metal protrusion 71 is simply referred to as the protrusion 71.

  A drive hole 54 is formed at a position of the crawler belt main body 50 located between the adjacent core bars 7. The rubber crawler belt 5 is rotationally driven in the forward rotation direction F (FIG. 2) and the reverse rotation direction by rotating while the drive protrusions 22a (FIG. 2) of the crawler drive wheel body 22 are engaged with the drive holes 54. .

  In the rubber crawler belt 5 according to the present invention, as shown in FIGS. 3 and 4, a belt center region (hereinafter, simply referred to as a center region) 53 in which the region in the width direction is a belt-like region in which the projection group 70 is disposed. And a pair of left and right belt first regions 51 located on both sides of the central region 53, and a pair of left and right belt second regions 52 located on the outer sides of the left and right belt first regions 51, respectively. The inner peripheral surface of the belt first region 51 substantially functions as the wheel running surface RB.

  On the outer peripheral surface of the crawler belt main body 50, a lug group 60 is disposed in the longitudinal direction of the crawler belt main body 50. The lug group 60 is a plurality of lugs 61 in which the lugs 61 are formed at a predetermined pitch (lag pitch) in the longitudinal direction. Each lug 61 is formed of a rubber body integrally formed with the crawler belt main body 50, and extends in the lateral direction of the crawler belt main body 50.

A recess group 8 is formed on the inner peripheral surface of the belt second region 52. In this embodiment, the recess group 8 includes a recess 80 formed as a groove extending from the boundary region between the belt first region 51 and the belt second region 52 to the outer end of the belt second region 52 and opening. Has been. The recesses 80 are provided at a predetermined pitch in the longitudinal direction of the crawler belt main body 50. The groove-like recess 80 extends linearly with a rectangular cross section. The thickness of the belt second region 52 is not constant.
It is preferable that the depth of the groove-shaped recess 80 is ¼ to ¾ of the thickness of the belt second region 52 at the thinnest portion of the belt second region 52.

In this embodiment, as shown in FIGS. 2 and 4, the lug pitch that is the interval between adjacent lugs 61 in the longitudinal direction of the crawler belt main body 50 is twice the projection pitch of the projection group 70. In addition, one protrusion 71 corresponds to an intermediate position between adjacent lugs 61, but the lug pitch and the protrusion pitch are the same, and the lug 61 and the protrusion 71 are opposed to each other at 1: 1. You may arrange. The formation pitch of the groove-shaped recess 80 is 1/4 to 1/1 of the lug pitch.
The number is about 10 and several to about 10 are formed between adjacent lugs 61.

  FIG. 5 shows another embodiment of the rubber crawler belt 5 according to the present invention. The only difference between this alternative embodiment and the above-described embodiment is the form of the recess group 8. In this embodiment, the recess 80 constituting the recess group 8 is a recess having a substantially isosceles triangle shape in plan view, instead of a groove. The outer edge in the width direction of the rubber crawler belt 5, which is the outer end of the belt second region 52, coincides with the base of a substantially isosceles triangle, and the concave portion 80 opens to the outside. That is, the recess 80 has a width in plan view that decreases from the outer side in the width direction of the rubber crawler belt 5 to the center. The depth of the recess 80 is substantially constant in this embodiment, but may be changed. Also in this other embodiment, the bending loss of the rubber crawler belt 5 when meshing with the crawler driving wheel 22 or the crawler tensioning wheel 23 is low, so that the driving loss is higher than that of the rubber crawler belt 5 with higher bending rigidity. Is reduced. When the rubber crawler belt 5 has a high bending rigidity, not only does it consume more energy to bend the rubber crawler belt 5, but also the necessary rubber to follow the rotation trajectory of the crawler driving wheel 22 and the crawler tension ring 23. Since the tension on the crawler belt 5 increases, the rotational load on the crawler driving wheel 22 and the crawler tension ring 23 increases. Further, due to the increase in tension, the rubber crawler belt 5 easily slips with respect to the tooth surfaces of the crawler driving wheel body 22 and the crawler tension ring body 23, resulting in a driving loss. Further, since the concave group 8 is also formed only in the belt second region 52 that is spaced outward in the width direction from the wheel running surface RB on which the ground wheels 24 and 26 run, there is an adverse effect on the wheel running performance. Don't give.

  A variation of the alternative embodiment shown in FIG. 5 is shown in FIG. If the recessed part 80 of FIG. 5 is made into a triangular shape, the recessed part 80 in this modification is an inverted triangular shape in plan view. That is, one vertex of the inverted triangular recess 80 is located at the outer edge of the rubber crawler belt 5 in the width direction, and the recess 80 opens outward. That is, the recess 80 has a width in plan view that increases from the outer side in the width direction of the rubber crawler belt 5 to the center.

  The shape of the recess 80 may be other polygonal shapes instead of a triangular shape or an inverted triangular shape in plan view. Moreover, you may employ | adopt circular shape and elliptical shape. That is, an appropriate shape of the recess 80 in plan view can be adopted depending on the cross-sectional shape of the belt second region 52. Further, the depth of the recess 80 is not constant, and may be tapered or stepped. Furthermore, as a modification of the embodiment shown in FIG. 4, the recess 80 may be formed as a zigzag or wavy groove instead of a linear groove. Of course, the groove depth is not constant, and may be tapered or stepped.

  In the embodiment described above, the recess 80 extends from the boundary region between the belt first region 51 and the belt second region 52 to the outer end of the belt second region 52 and opens toward the outer side in the width direction. It does not have to be opened. For example, the recess 80 may be formed as a space closed in the lateral direction in the belt second region 52, leaving the edge of the belt second region 52 outside in the width direction.

  Next, the suitable form of the outer peripheral surface of the crawler belt main body 50 in which the lug group 60 is formed is demonstrated using FIG. As shown in FIG. 7, a plurality of sipes 55 extending substantially in the width direction of the crawler belt main body 50 are formed on the outer peripheral surface located between adjacent lugs 61. Mud and soil enter between the adjacent lugs 61 constituting the lug group 60. However, when the crawler belt main body 50 passes through the crawler driving wheel body 22 or the crawler tension ring body 23, when the sipe 55 is opened when the crawler belt body 50 is bent toward the inner peripheral surface side, mud and dirt that have entered between the lugs 61 are dropped. It becomes easy. In FIG. 7, the sipe 55 extends in a zigzag shape, but a wave shape or a straight sipe 55 may be used instead.

  FIG. 8 shows a modified example of the lug 61. In FIG. 8, the lug 61 has a straight lug portion 610 extending linearly in the width direction of the crawler belt main body 50, and a bent lug bent and extended from both ends of the linear lug portion 610 toward the adjacent lug 61. Part 611. In this lug 61, since the bent lug portion 611 extends in the inter-lug region between the adjacent lugs 61, the compression rigidity in the inter-lug region is increased. Thereby, the compression rigidity of the crawler belt main body 50 becomes more uniform.

  FIG. 9 shows a measure for reducing local stress exerted on the protrusion 71 by the rollers 24 and 26. As shown in FIG. 9, the protrusion 71 is at least partially covered with the rubber of the crawler belt main body 50, but conventionally, a high stress is generated in the root area of the protrusion 71, and the rubber in that area is worn, With this as a trigger, peeling of the protrusion 71 is likely to proceed. However, the grounding rollers 24 and 26 shown in FIG. 9 conventionally cut a corner portion that has been in contact with the root region of the protrusion 71, and a notch 240 is formed in the corner portion. For this reason, it is suppressed that the contact rolling wheels 24 and 26 contact the root area | region of the processus | protrusion 71, and abrasion of the rubber | gum of a root area | region reduces. As a result, the progress of peeling of the protrusion 71 is suppressed.

  INDUSTRIAL APPLICABILITY The present invention can be used for a rubber crawler belt installed in various harvesting machines for harvesting various crops such as carrots and onions, various working vehicles such as a transport vehicle and a backhoe, in addition to a combine.

1: Crawler type traveling device 22: Crawler driving wheel 22a: Drive protrusion 23: Crawler tension wheel 24: Grounding wheel 24a: Outer wheel 24b: Inner wheel 240: Notch 26: Grounding wheel 50: Crawler belt Main body 51: Belt first region 52: Belt second region 53: Central region (belt central region)
54: drive hole 55: sipe 60: lug group 61: lug 610: straight lug portion 611: bent lug portion 7: core metal 70: protrusion group 71: core metal protrusion (protrusion)
72: Core metal substrate 8: Recess group 80: Recess RB: Rolling wheel running surface

Claims (8)

Endless belt-shaped rubber crawler belt body,
A group of lugs formed on the outer peripheral side of the crawler belt body;
A group of protrusions formed on the inner peripheral side in the belt central region extending along the circumferential direction in the width direction central side of the crawler belt body;
A wheel running surface formed on the inner circumferential surface of a pair of left and right belt first regions located on both sides in the width direction of the belt central region;
A recess group formed on the inner peripheral surface of a pair of left and right belt second regions located on the outer side in the width direction of each belt first region,
The lugs constituting the lug group are formed from the outer end on one side to the outer end on the other side in the lateral width direction of the crawler belt body,
The width of the lug in the circumferential direction is configured to be shorter than the length between the adjacent rising edges in the adjacent lugs,
The recess group includes a plurality of grooves extending in the width direction of the crawler belt body and arranged in the circumferential direction,
The width of the groove in the circumferential direction is formed shorter than the width of the lug in the circumferential direction,
On the inner peripheral surface of the belt second region, a plurality of the grooves are formed in a portion corresponding to a portion between the adjacent rising edges of the adjacent lugs , and the groove is formed in a portion corresponding to the lug. Has been a rubber crawler belt.   The rubber according to claim 1, wherein the plurality of grooves extend from a boundary region between the belt first region and the belt second region to an outer end of the belt second region and open outward in the width direction. Crawler belt.   The rubber crawler belt according to claim 2, wherein the groove extends linearly with a rectangular cross section.   The rubber crawler belt according to claim 3, wherein a formation pitch of the grooves is ¼ to 1/10 of a lag pitch at which the lug group is formed.   The rubber crawler belt according to any one of claims 1 to 4, wherein a depth of the concave group is ¼ to ¾ of a thickness of the belt second region.   6. The plurality of sipes extending in a width direction of the crawler belt main body are formed on an outer peripheral surface located between the lugs constituting the lug group. 6. Rubber crawler belt.   The rubber crawler belt according to claim 6, wherein the sipe extends in a zigzag shape.   The rubber crawler belt according to any one of claims 1 to 7, wherein the protrusion group is a core metal protrusion provided on a plurality of core bars embedded in the crawler belt main body.

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