JP2018100081A - Crawler traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a crawler belt easier to remove while the crawler belt can be supported by a ground rolling wheel near a tension wheel.SOLUTION: A plurality of ground rolling wheels 18 includes a closest ground rolling wheel 18R disposed at a position nearest to a tension wheel 17, located at a use position, and for acting a crawler belt 20. In the closest ground rolling wheel 18R, a position can be changed from the use position.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a crawler traveling device, specifically, a drive wheel, a tension wheel rotatably supported by the track frame at a position away from the drive wheel in the front-rear direction of the track frame, the drive wheel, A plurality of grounding wheels rotatably supported by the track frame in a state of being arranged in the front-rear direction between the tensioning wheel, and the crawler wound around the driving wheel, the tensioning wheel, and the grounding wheel. A belt, a rubber crawler belt main body, and a plurality of core bars embedded in the rubber crawler belt main body in a state of being spaced along the circumferential direction of the rubber crawler belt main body, A pair of left and right cored bar projections projecting toward the inner peripheral side of the rubber crawler belt main body, and the grounding wheel has a pair of left and right cored bar projections. Wherein about crawler traveling device in a pair of left and right wheels body portion that supports acting on the inner peripheral surface of the rubber crawler belt main body is provided at a point situated divided on both outer sides in the width direction of the rubber crawler belt body.

  In the above-described crawler traveling device, for example, as shown in Patent Document 1, a grounded wheel (the last grounded wheel in the publication) that is closest to a tensioned wheel among a plurality of grounded wheels cannot be moved up and down on the track frame. Some are configured to support the crawler belt in a fixed state.

JP 2012-184005 A

The larger the diameter of the tension ring, the smaller the curvature of the crawler belt portion applied to the tension ring, and the crawler belt becomes less painful. The higher the grounding wheel closest to the tension wheel (hereinafter referred to as the nearest ground wheel) is positioned higher than the adjacent grounding wheel, the closer to the grounded wheel and the adjacent grounding wheel. It is difficult for a strong ground reaction force to be applied to the crawler belt section, and it is difficult to receive resistance during turning.
In the crawler traveling device that supports the crawler belt while fixing the nearest land rolling wheel to the track frame so that it cannot be moved up and down, the diameter of the tension wheel is increased, or the nearest ground rolling wheel is positioned higher than the adjacent grounding wheel. If the crawler belt is in a tensioned state by adjusting the tension ring to the tension position, the tension ring is separated from the nearest land rotation wheel, and the lower part of the tension ring is the left and right wheel parts of the nearest land rotation wheel. Even if the tension ring is adjusted to the relaxed position and the crawler belt is in a slack state, the tension ring approaches the nearest ground wheel, so the lower part of the tension ring is closest There are cases where the upper part of the left and right wheel parts of the ground wheel is inserted between the upper parts of the wheel parts, and the lower part of the tension ring and the upper part of the wheel part overlap in the side view of the track frame.
In addition, depending on the size of the tension ring and the height of the nearest land rolling wheel, the lower part of the tension ring may be located between the upper parts of the right and left wheel bodies of the nearest land rolling wheel even when the crawler belt is in tension. And the lower part of the tension ring overlaps the upper part of the ring body part. In this case, when the tension ring is adjusted to the relaxed position and the crawler belt is in a slack state, the tension ring approaches the nearest land rolling wheel, so that the lower part of the tension ring is the right and left wheel parts of the nearest land rolling wheel. The depth of overlap between the lower part of the tension ring and the upper part of the ring body part increases.
When removing the crawler belt, even if the crawler belt is loosened, if the crawler belt and the tension ring overlap and the tension ring remains supported by the track frame, the tension ring becomes an obstacle. Difficult to remove.

  The present invention provides a crawler traveling device that can easily remove a crawler belt while the crawler belt can be supported by a grounded roller near a tensioning wheel.

The crawler traveling device according to the present invention includes:
Driving wheels,
A tension wheel rotatably supported by the track frame at a position away from the driving wheel in the front-rear direction of the track frame;
Between the drive wheel and the tension wheel, a plurality of grounding wheels rotatably supported by the track frame in a state of being aligned in the front-rear direction,
A crawler belt wound around the drive wheel, the tension wheel and the grounding wheel,
The crawler belt is provided with a rubber crawler belt main body, and a plurality of metal cores embedded in the rubber crawler belt main body in a state of being spaced along the circumferential direction of the rubber crawler belt main body,
The cored bar is provided with a pair of left and right cored bar projections projecting to the inner peripheral side of the rubber crawler belt body,
The left and right sides that support and act on the inner peripheral surface of the rubber crawler belt main body at locations that are separated from both the outer sides in the width direction of the rubber crawler belt main body with respect to the pair of left and right core metal protrusions A pair of ring bodies is provided,
A plurality of the grounded wheels are provided at a location closest to the tension wheel, and are provided with a close proximity ground wheel that is located at a use position and acts on the crawler belt,
The position of the nearest land rolling wheel can be changed from the use position.

  According to this configuration, the nearest ground roller at the use position acts on the crawler belt near the tension wheel. By changing the position of the nearest land rolling wheel from the use position, the position of the nearest land rolling wheel changes to the side that releases the action on the crawler belt, so the nearest ground rolling wheel is moved to the side that releases the overlap with the tension wheel. The tension ring can be removed.

  Therefore, while the crawler belt can be supported by the closest ground roller near the tension ring, when removing the crawler belt, the tension ring can be removed so as not to become an obstacle, and the crawler belt can be easily removed.

  In the present invention, the track frame is lifted and lowered between a rising position that supports the nearest land rolling wheel at a lifting action position as the use position and a lowered position that supports the nearest ground rolling wheel at a lowering action release position. A wheel support body supported in a possible manner, a fixed action state in which the wheel support body is fixed to the raised position, and an action release state in which the wheel support body is allowed to descend to the lowered position. It is preferable that a position fixing mechanism that can be switched to is provided.

According to this configuration, by switching the position fixing mechanism to the fixed action state, the wheel support is fixed to the raised position by the position fixing mechanism, and the nearest ground wheel is fixed to the rising action position. The grounding wheel can be fixed to the track frame so as not to be lifted and lowered so as to act on the crawler belt.
By switching the position fixing mechanism to the action release state, the lowering of the wheel support to the lowered position is allowed, and the nearest ground wheel can be lowered to the lowering action release position, so that the tension ring is brought into the relaxed position. When the crawler belt is slackened by adjusting the position, even if the ring body part of the nearest land turn and the tension wheel overlap each other, the nearest land turn is lowered to the lowering release position. By doing so, the nearest land-falling wheel descends with respect to the tension wheel, and the nearest-neighboring land rolling wheel can be moved to the side where the overlap with the tension wheel is released, so that the tension wheel can be easily removed.

  In the present invention, it is preferable that a stopper is provided that is supported by the track frame and that abuts against the wheel support and restricts the nearest ground rolling wheel from being lifted from the ascending position. is there.

  According to this configuration, when the wheel support is lifted and the wheel support hits the stopper, the nearest ground wheel is in the ascending position, so the position fixing mechanism is simply raised until the wheel support hits the stopper. Can be switched to the fixed operation state. It is possible to easily switch the position fixing mechanism to the fixed action state without taking any special effort to adjust the position fixing mechanism to the state in which it can be switched to the fixed action state, and to keep the nearest ground rolling wheel in the ascending action position.

  In the present invention, when the position fixing mechanism is in the fixing action state and the crawler belt is in a tensioned state, the lower side of the tensioning wheel and the nearest ground rolling wheel in the side view of the track frame It is preferable that the upper portion of the ring body portion overlaps.

  According to this configuration, when the nearest ground wheel is located at the ascending action position and the tension ring is located at the tension position, the upper part of the nearest ground wheel overlaps with the lower part of the tension wheel. By increasing the diameter of the wheel, it is possible to make the crawler belt main body less painful, or by increasing the height of the nearest ground wheel to the adjacent ground wheel, thereby suppressing the resistance applied to the crawler belt from the ground during turning.

  In the present invention, when the wheel support is in the lowered position, it is preferable that the nearest ground wheel does not overlap the tension wheel in a side view of the track frame.

  According to this configuration, when the tension ring is removed, the tension ring is less likely to come into contact with the nearest land rolling wheel located at the lowering release position, and is easy to remove.

  In the present invention, it is preferable that a support arm extending from the track frame and supporting the tension ring is provided, and a support portion for receiving and supporting the support arm from below is provided on the wheel support. It is.

  According to this configuration, the tension of the crawler belt applied to the tension ring acts as an operation force for pulling down the support arm relative to the support arm, but the support arm can be firmly received and supported by the support portion against the pull-down operation force. it can. The roller support can be used at low cost by utilizing it as a support member.

  In the present invention, the roller support is supported by the track frame so as to be swingable up and down about a lateral axis in a direction along the horizontal direction of the track frame, and supports the nearest ground roller on the free end side. A swing member that is disposed below the wheel support and the nearest ground roller, and that guides between the pair of left and right cored bar projections to the cored bar projections, It is preferable that the member is supported by the wheel support in a state extending over a position corresponding to the lateral axis and a position corresponding to the rotation axis of the nearest ground roller.

  According to this configuration, the guide member has a long length extending from the position corresponding to the lateral axis of the roller support to the position corresponding to the rotation axis of the nearest ground roller, and the crawler belt is engaged with the nearest ground wheel. As a result, the guide member can be guided accurately. The guide member can be fixed to the track frame with a connecting structure obtained at low cost by utilizing a roller support for the connecting member for connecting the guide member to the track frame.

  In the present invention, left and right one side mounting portions are provided on one side portion of the guide member in the front-rear direction, and the other side mounting portion is provided on the other side portion of the guide member in the front-rear direction. The left and right one side mounting portions are fixed to the left side portion and the right side portion on one side of the wheel support by tightening upward from below with a fastener, and the other side mounting portion is It is preferable that the fastener is fixed to the other end portion of the roller support by tightening the fastener along the lateral axis side.

  According to this configuration, since the guide member is fastened and connected to the wheel support at three locations, the guide member can be stably fixed, and the tightening direction at the one side portion of the guide member intersects the tightening direction at the other side portion. Therefore, it is possible to firmly cope with torsion and the like, and the guide member can be firmly fixed to the wheel support with a few fasteners.

It is a left view which shows the whole combine. It is a side view which shows a ground rolling wheel and the immediate proximity ground rolling wheel of a raise action position. It is a side view which shows the immediate proximity land rolling wheel of a descent | fall action cancellation | release position. It is a rear view which shows a direct proximity land rolling wheel. It is a top view which shows the wheel support structure in a partially notched state. It is a perspective view which shows a grounding wheel and a tension ring. It is a perspective view which shows a wheel support and a guide member. It is a top view which shows the whole guide member. It is a side view which shows a grounding roller and a crawler guide. It is a top view which shows the connection structure of a rocking | fluctuation link and a hydraulic cylinder. It is a vertical front view which shows the support structure of an operation part. It is a side view which shows the rear part of the crawler traveling apparatus provided with another implementation structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The case where the crawler traveling device according to the embodiment of the present invention is applied to a combine will be described. FIG. 1 is a side view showing the entire combine. The direction [F] shown in FIG. 1 is defined as the front side of the traveling machine body 1, the direction [R] is defined as the rear side of the traveling machine body 1, the front side of the page is defined as the left side of the traveling machine body 1, and the back side of the page is defined as the right side of the traveling machine body 1.

  As shown in FIG. 1, the combine includes a traveling machine body 1 equipped with a pair of left and right crawler traveling devices 2. A driving unit 3 is formed on the right side of the front portion of the traveling machine body 1. The cutting unit 5 is connected to the front part of the machine body frame 4 so as to be swingable up and down in a lowered working state and a raised non-working state. The raising / lowering operation of the cutting part 5 is performed by the expansion / contraction operation of the hydraulic cylinder 6. A threshing device 7 and a grain tank 8 are provided at the rear of the traveling machine body 1.

In this combine, the harvesting work of crops such as rice and wheat can be performed by running the traveling machine body 1 with the mowing unit 5 lowered to the lowered work state.
That is, when the work travels, in the cutting unit 5, the planted stems located in front of the traveling machine body 1 are raised and processed by the pulling device 9. The stock of the planted cereal to be raised and cut is cut by the clipper type reaping device 10 and reaped. The harvested cereal meal is supplied to the front part of the threshing device 7 by the supply conveyance device 11. In the threshing device 7, the stock side of the harvested cereal rice cake is nipped and conveyed backward by the threshing feed chain (not shown), and the tip side of the harvested cereal rice cake is supplied to the handling chamber (not shown) and rotates. Threshed by (not shown). After the grain obtained by threshing is selected from dust such as straw scraps, it is supplied to the grain tank 8 and stored. The stored grain can be taken out from the grain tank 8 by the grain carrying-out device 12 using a screw conveyor.

The crawler traveling device 2 will be described.
The left and right crawler traveling devices 2 have the same configuration. Therefore, the following description is common to the left and right crawler traveling devices 2.

  As shown in FIG. 1, the crawler traveling device 2 includes a track frame 15, a drive wheel 16 provided in front of the track frame 15, and a tension wheel 17 provided at a position separated rearward from the drive wheel 16. And nine grounding wheels 18 provided between the drive wheel 16 and the tension wheel 17, and two upper wheels 19 provided between the drive wheel 16 and the tension wheel 17. . A crawler belt 20 is wound around the drive wheel 16, the ground wheel 18, the tension wheel 17, and the upper wheel 19.

  As shown in FIG. 1, the track frame 15 is supported by the body frame 4 via the front and rear swing links 21. The rear swing link 21 and the track frame 15 are connected via a cancel link 22 (see FIG. 2). The drive wheel 16 is rotatably supported by the mission case 23 and is supported by the body frame 4 via the mission case 23. The nine grounding wheels 18 are rotatably supported by the track frame 15 in a state where they are arranged at intervals in the front-rear direction of the track frame 15. The two upper rollers 19 are rotatably supported by the support portion of the body frame 4. The tension ring 17 is rotatably supported by the rear end side portion of the track frame 15.

  In the crawler traveling device 2, the drive wheels 16 are driven to rotate forward and backward by a traveling mission (not shown) built in the mission case 23. The crawler belt 20 is driven by the drive wheel 16 while being maintained in a tension state that can be driven by the tension wheel 17, and rotates in the forward direction and the reverse direction along the grounded wheel 18 and the upper wheel 19. A portion of the crawler belt 20 along the grounding wheel 18 between the driving wheel 16 and the tensioning wheel 17 is supported in a grounded state by the grounding wheel 18 and causes the traveling machine body 1 to travel.

  As shown in FIGS. 2, 4 and 6, the track frame 15 is composed of a lower track frame 15a and an upper track frame 15b. The lower track frame 15a and the upper track frame 15b are connected in an overlapping manner.

  As shown in FIGS. 2 and 4, the crawler belt 20 includes a rubber crawler belt main body 25 and a plurality of core bars 26 embedded in the rubber crawler belt main body 25. The plurality of metal cores 26 are arranged at intervals in the circumferential direction of the rubber crawler belt main body 25. Each core metal 26 is provided with a pair of left and right core metal protrusions 26a. The upper ends of the left and right cored bar protrusions 26 a protrude toward the inner peripheral side of the rubber crawler belt main body 25.

  As shown in FIG. 4, the tension ring 17 is configured as a so-called inner ring so as to support the crawler belt 20 between the left and right cored bar protrusions 26 a.

As shown in FIGS. 2, 6, and 7, a tension ring support portion 27 is formed on the rear end side portion of the track frame 15. A support arm 28 extends rearward from the tension ring support portion 27.
A bifurcated ring body support portion 28 a is formed on the extended end portion of the support arm 28 in plan view.
The support shaft 17a of the tension ring 17 is supported by the ring body support portion 28a, and the tension ring 17 is supported by the tension ring support portion 27 via the support arm 28.

  The tension ring support portion 27 includes a groove-shaped member 27a whose longitudinal cross-sectional shape opens downward, and a plate-shaped connecting member 29 that closes the openings at both front and rear side portions of the groove-shaped member 27a, and has a cylindrical shape. ing. The groove-shaped member 27a and the track frame 15 are connected by a connecting member 29 on the front end side, a connecting member 29 on the rear end side, and a connecting member 30 connected to the connecting member 29 on the rear end side. A front end side portion of the support arm 28 is slidably fitted to the tension ring support portion 27. The support arm 28 is supported so as to be slidable in the front-rear direction of the track frame 15.

  As shown in FIGS. 2 and 6, a tension adjusting mechanism 32 is provided across the tension ring support portion 27 and the support arm 28. The tension adjustment mechanism 32 includes an adjustment screw shaft 33 that extends in the front-rear direction of the track frame 15. The front end side of the adjustment screw shaft 33 is supported by the screw shaft support portion 34. The screw shaft support portion 34 is fixed to the tension ring support portion 27. A screw hole into which the adjustment screw shaft 33 is screwed is formed in the screw shaft support portion 34. The rear end portion of the adjustment screw shaft 33 is supported by the arm operation portion 35. The arm operation part 35 is fixed to the ring body support part 28 a and moves integrally with the support arm 28. The adjustment screw shaft 33 and the arm operation part 35 are engaged with each other so as to be relatively rotatable and relatively unmovable.

  In the tension adjustment mechanism 32, when the adjustment screw shaft 33 is rotated, the adjustment screw shaft 33 moves in the front-rear direction with respect to the screw shaft support portion 34, and the arm operation portion 35 is moved by the adjustment screw shaft 33. The support arm 28 is slid in the front-rear direction. Therefore, by rotating the adjustment screw shaft 33, the tension ring 17 can be moved and adjusted to the tension side (rear side) and the relaxation side (front side).

  As shown in FIGS. 2, 4, 5, and 6, the nine grounding rollers 18 are provided with a pair of left and right ring bodies 18 a arranged at intervals in the width direction of the rubber crawler belt main body 25. As shown in FIGS. 2 and 4, the left and right ring bodies 18a are located on both outer sides in the lateral width direction of the rubber crawler belt main body 25 with respect to the pair of left and right cored bar projections 26a. Supports the inner peripheral surface of the main body 25. The nine grounding wheels 18 are configured as so-called outer wheels so as to support the crawler belt 20 on both lateral outer sides of the pair of left and right cored bar protrusions 26a.

  As shown in FIG. 1, among the nine grounding wheels 18, the first and second two grounding wheels 18 from the front, the third and fourth two grounding wheels 18, the fifth and the sixth ones. The two grounding rollers 18 and the second and eighth grounding wheels 18 are supported by the track frame 15 via one balance support 37. As shown in FIGS. 2 and 6, a connecting boss portion 37 a is formed in a portion of the balance support body 37 located between the support portions of the two grounding wheels 18. The balance support body 37 is swingably supported by the track frame 15 by a connecting boss portion 37a. The two grounding wheels 18 supported by each balance support 37 are raised and lowered against the track frame 15 by the swinging of the balance support 37.

  A crawler guide 38 extending in the front-rear direction of the track frame 15 is provided below each balance support 37. The crawler guide 38 enters between the left and right core metal protrusions 26 a and guides the left and right core metal protrusions 26 a so as to pass between the left and right ring body portions 18 a of the grounding wheel 18. The crawler belt 20 is guided by a crawler guide 38 so as to be engaged with the grounding wheel 18.

  As shown in FIGS. 2 and 6, of the nine grounded wheels 18, the closest ground wheel 18 </ b> R closest to the tension wheel 17 is supported by the track frame 15 via the wheel support 40.

  As shown in FIG. 7, the wheel support 40 includes a connecting boss portion 40a, an arm portion 40b extending from the connecting boss portion 40a, and a supporting boss portion 40c formed at the extended end of the arm portion 40b. The swing member is provided with. As shown in FIGS. 2 and 5, the connecting boss portion 40 a is supported in a state of being externally fitted to the support shaft 41 of the track frame 15 so as to be relatively rotatable. The connection boss portion 40a is maintained in an externally fitted state by a retaining member 43 attached to the support shaft 41 by a connection bolt 42. The support shaft 18b of the closest land rolling wheel 18R is rotatably supported by the support boss portion 40c.

The wheel support 40 is supported by the track frame 15 so as to be able to swing up and down with a horizontal axis P in a direction along the track frame horizontal direction of the support shaft 41 as a swing fulcrum. 3 is swingable up and down. The directly adjacent ground wheel 18R is supported by the support boss portion 40c. The nearest land rolling wheel 18R is swung up and down with respect to the track frame 15 by the rocking wheel support body 40 that rocks about the axis of the support shaft 41 as a rocking fulcrum.
As shown in FIG. 2, when the rolling wheel support body 40 is lifted to the lifted position, the closest land rolling wheel 18 </ b> R is lifted to the lifting action position as the use position, and the closest ground rolling wheel 18 </ b> R is lifted. It can be supported by the wheel support 40 at a position. As shown in FIG. 3, when the wheel support 40 is lowered to the lowered position, the nearest land turn wheel 18R is lowered to the lowering action release position, and the nearest land turn wheel 18R is moved to the lowering action release position. It can be supported by the wheel support 40.

  In the present embodiment, the position changing means for lowering the nearest land rolling wheel 18R is employed to change the position of the nearest land rolling wheel 18R at the use position to the side where the overlap with the tension wheel 17 is released. Not only the configuration but also a position changing means for removing the nearest land rolling wheel 18R from the track frame 15 may be adopted. That is, in the present invention, “the position change from the use position of the nearest land rolling wheel” includes “removal of the nearest land rolling wheel”.

  As shown in FIGS. 2 and 7, a position fixing mechanism 45 is provided across the track frame 15 and the wheel support 40.

  As shown in FIG. 7, the position fixing mechanism 45 includes two fixing bolts 46 and a positioning portion 47. The positioning portion 47 is formed on the track frame 15. As shown in FIG. 7, a bolt mounting portion 40 d is formed on the wheel support 40.

As shown in FIG. 2, the two fixing bolts 46 are attached to the screw holes 47a of the positioning portion 47 through the bolt holes of the bolt attaching portion 40d. The fixing bolt 46 engages with the screw hole 47 a and is held by the positioning portion 47, and the wheel support 40 is prevented from rotating by the fixing bolt 46. As a result, the position fixing mechanism 45 is in a fixed action state, and the wheel support 40 is fixed to the raised position by the position fixing mechanism 45.

  As shown in FIG. 3, when the two fixing bolts 46 are removed from the positioning portion 47 and the bolt mounting portion 40 d, the rotation prevention of the wheel support 40 by the fixing bolt 46 is released. As a result, the position fixing mechanism 45 is in an action-released state, and the descent support 40 is allowed to descend to the lowered position.

  In normal times, as shown in FIG. 2, the tension adjusting mechanism 32 is adjusted to the tension side by rotating the adjusting screw shaft 33 so that the tension ring 17 is positioned at the tension position, and the crawler belt 20 is moved by the tension ring 17. Keep it in a drivable tension state. Further, as shown in FIG. 2, the position fixing mechanism 45 is switched to the fixed operation state, and the wheel support 40 is fixed at the raised position, so that it resists the tension of the crawler belt 20 acting on the nearest ground wheel 18R. Then, the nearest land rolling wheel 18R is fixed to the rising action position by the wheel support 40. In this embodiment, as shown in FIG. 2, when the position fixing mechanism 45 is in the fixing action state and the crawler belt 20 is in the tensioned state, the lower part of the tensioning wheel 17 is the left and right wheels of the closest land rolling wheel 18R. It enters between the upper parts of the body part 18a, and when the track frame 15 is viewed from the side, the lower part of the tension ring 17 and the upper part of the ring body part 18a of the closest land rolling wheel 18R are overlapped.

  When removing the tension ring 17, as shown in FIG. 3, the adjustment screw shaft 33 is rotated to operate the tension adjustment mechanism 32 to the slack side, the tension ring 17 is adjusted to the relaxed position, and the crawler belt 20 is moved. Make it loose. When the crawler belt 20 is loosened, the two fixing bolts 46 are removed, the position fixing mechanism 45 is switched to the action release state, the wheel support 40 is lowered to the lowered position, and the nearest ground wheel 18R is brought to the lower action release position. Lowering is performed to release the overlap between the ring body portion 18a of the nearest land rolling wheel 18R and the tension wheel 17. When the overlap disappears, the support shaft 17a of the tension ring 17 is extracted rearward from the cutout hole 28b of the ring body support portion 28a, and the tension ring 17 is extracted laterally outward from between the ring body support portion 28a and the crawler belt 20. .

  As shown in FIGS. 2 and 4, a support portion 50 is provided on the upper part of the wheel support 40. The support arm 28 is received and supported by the support portion 50 from below. Although the tension of the crawler belt 20 applied to the tension ring 17 acts on the support arm 28 as an operation force for pulling down the support arm 28, the support arm 28 is firmly received and supported by the support portion 50 against the pull-down operation force.

  As shown in FIGS. 2, 4, and 7, the support portion 50 includes an attachment base portion 51 and a support action portion 52. The mounting base 51 is fastened and fixed to the wheel support 40 by two connecting bolts 46 and 53, so that the support 50 is supported by the wheel support 40. One connecting bolt 46 of the two connecting bolts 46 and 53 and the fixing bolt 46 of the position fixing mechanism 45 are shared. The supporting action part 52 is constituted by a bolt projecting upward from the screw hole of the mounting base part 51. By rotating the support action portion 52, the height at which the support action portion 52 protrudes from the mounting base 51 can be adjusted. By rotating the support action portion 52, the height of the support action portion 52 can be adjusted so that the support action portion 52 accurately receives and acts on the support arm 28. In this embodiment, the support portion 50 is supported by the wheel support 40, but a support portion supported by the track frame 15 may be employed.

As shown in FIGS. 2 and 4, a guide member 55 is disposed below the roller support 40 and the nearest ground roller 18 </ b> R. The guide member 55 is supported by the wheel support 40 in a state extending from a position corresponding to the lateral axis P and a position corresponding to the rotation axis X of the closest ground roller 18R.
As shown in FIG. 4, the guide member 55 is inserted between the left and right core metal protrusions 26 a and guides the left and right core metal protrusions 26 a so as to pass between the left and right ring body portions 18 a of the closest land rolling wheel 18 </ b> R. To do.
The crawler belt 20 is guided by the guide member 55 so as to be engaged with the closest land rolling wheel 18R.

  As shown in FIGS. 7 and 8, left and right front mounting portions 56 (one side mounting portions) are formed on the front side portion of the guide member 55 (one side portion in the front-rear direction of the track frame 15). The left and right front mounting portions 56 project outward from the guide member 55 in the crawler belt lateral width direction. A rear side mounting portion 57 (the other side mounting portion) is formed on the rear side portion of the guide member 55 (the other side portion in the front-rear direction of the track frame 15).

  The left and right front mounting portions 56 are tightened upward from below by connecting bolts 58 with respect to the left side portion and the right side portion on the front side of the wheel support 40 (one side in the front-rear direction of the track frame 15). The front side of the guide member 55 is fixed to the wheel support 40. The rear attachment portion 57 is fixed by tightening the connecting bolt 59 along the lateral axis P side with respect to the rear end portion (the other end portion in the front-rear direction of the track frame 15) of the wheel support 40. The rear side of the guide member 55 is fixed to the wheel support 40.

  In this embodiment, a screw hole is formed in the wheel support 40 and only the connecting bolts 58 and 59 are used. However, a screw hole is not formed in the wheel support 40 and a connecting bolt and a nut are used. Is possible. Moreover, not only a bolt but various fasteners, such as a rivet, are employable.

  As shown in FIGS. 1 and 2, the balance support body 37 that supports the seventh and eighth contact wheels 18 and the cancel link 22 are supported by the track frame 15 via a common fulcrum shaft 39. . As shown in FIGS. 1 and 9, a balance support 37 (hereinafter referred to as a front balance support 37) that supports the first and second grounding wheels 18 from the front, and the third and fourth from the front. A balance support 37 (hereinafter referred to as the front balance support 37) for supporting the grounding wheel 18, and a balance support 37 (hereinafter referred to as a front balance support) for supporting the fifth and sixth grounding wheels 18 from the front. In this case, the distance between the rotation shaft centers of the two grounding wheels 18 supported by the front balance support body 37 is L1, and the seventh and eighth grounding wheels 18 from the front. When the distance between the rotation shaft centers of the two grounding wheels 18 supported by the balance support body 37 (hereinafter referred to as the rear-side balance support body 37) that supports is L2, the distance L2 is greater than the distance L1. Is also set longer. Compared to setting the distance L2 and the distance L1 to the same length, the distance D1 between the crawler guide 38 supported by the front balance support 37 and the crawler guide 38 supported by the rear balance support 37, and The distance D2 between the crawler guide 38 supported by the rear balance support 37 and the guide member 55 supported by the roller support 40 becomes narrow, and the crawler belt 20 is connected to the grounded roller 18 and the closest ground roller 18R. It can be hard to come off.

  As shown in FIGS. 1 and 9, the front balance support 37 has a narrow distance D3 between the connecting boss portion 37a connected to the track frame 15 and the grounding wheel 18, and the connecting boss portion 37a and the grounding wheel 18 are connected to each other. It is configured so that stones are not easily sandwiched between them. The distance D3 is set to 6.5 mm or less.

  FIG. 10 is a plan view showing a connection structure between the front and rear swing links 21 and the hydraulic cylinder 60 that swings the swing links 21. The connection structure includes a swing arm 61 that is linked to the swing link 21 so as not to swing relative to each other, a pair of left and right connecting members 62 that sandwich the free end portion of the swing arm 61 from both sides, and left and right connecting members. 62 and a connecting shaft 63 attached to the swing arm 61. The left and right connecting members 62 are connected to the tip of the cylinder rod 60 a of the hydraulic cylinder 60. A rotation stopping member 63 a is connected to one connecting member 62 and one end of the connecting shaft 63. The rotation of the connecting shaft 63 is prevented and removed by the rotation-preventing member 63a. Between the boss portion of the swing arm 61 and the connecting shaft 63, a bush 64 that smoothes the relative rotation between the swing arm 61 and the connecting shaft 63 is interposed.

  FIG. 11 is a longitudinal sectional front view showing a support structure of the operation unit 3. A pair of left and right driving unit frames 65 that support the cabin of the driving unit 3, the control panel, and the like are provided on the lateral side of the body frame 4. The left and right operation unit frames 65 are made of a pipe material extending in the longitudinal direction of the machine body. The body frame 4 is provided with a main frame 66 extending in the longitudinal direction of the body. The main frame 66 is made of a pipe material, and supports the track frame 15 (see FIG. 1) via the front and rear swing links 21 (see FIG. 1). Of the left and right driving unit frames 65, the driving unit frame 65 on the inner side of the fuselage is placed on the main frame 66 via the spacer member 67, and is supported by the main frame 66 in this mounted state. In the present embodiment, the spacer member 67 is employed, but the spacer member 67 may not be employed.

  FIG. 12 is a side view showing a rear portion of the crawler traveling device 2 having another embodiment structure. In the crawler traveling device 2 having another implementation structure, a stopper 68 is supported on the track frame 15 above the lateral axis P that is a swing fulcrum of the wheel support 40.

  When returning the nearest land rolling wheel 18R from the lowering action release position to the ascending action position, when the wheel support 40 is raised and positioned at the ascending position, the bolt mounting portion 40d of the wheel support 40 contacts the stopper 68, The stopper 68 restricts the immediate proximity land rolling wheel 18R from rising from the ascending action position. In this restricted state, the bolt hole for mounting the fixing bolt 46 in the bolt mounting portion 40d matches the screw hole 47a (see FIG. 7) in the positioning portion 47, and the position fixing mechanism 45 causes the fixing bolt 46 to move. It becomes a state that can be switched to the fixed action state simply by mounting. That is, when the wheel support 40 is raised until the stopper 68 contacts the wheel support 40, the position fixing mechanism 45 can be switched to the fixed action state. As a result, the position fixing mechanism 45 can be switched to the fixed action state without causing any special effort to adjust the position fixing mechanism 45 so that the position fixing mechanism 45 can be switched to the fixed action state. The wheel can be held in the raising action position.

[Another embodiment]
(1) In the above-described embodiment, the example in which the wheel support 40 is configured by the swinging member and the directly adjacent ground wheel 18R is moved up and down by swinging is shown. However, the wheel support 40 slides. It may be configured by a support body that moves up and down, and a configuration in which the nearest land rolling wheel 18R moves up and down in a straight line may be adopted.

(2) In the above-described embodiment, when the tension ring 17 is adjusted to the tension position and the crawler belt 20 is in the tensioned state, the tension ring 17 and the ring body portion 18a of the nearest land rotation wheel 18R are overlapped. However, when the crawler belt 20 is in a tensioned state, the tensioning wheel 17 and the ring body portion 18a of the closest land rolling wheel 18R do not overlap, and the tensioning wheel 17 is moved from the tensioned position to the relaxed position. When the crawler belt 20 is in a loose state, a configuration in which the tensioning wheel 17 and the ring body portion 18a of the closest land rolling wheel 18R overlap may be employed.

(3) In the above-described embodiment, the driving wheel 16 is located on the front side of the crawler traveling device 2 and the tension wheel 17 is located on the rear side of the crawler traveling device 2, but the driving wheel 16 is located on the rear side. It is possible to adopt a configuration in which the tension ring 17 is located on the front side.

(4) In the above-described embodiment, the connecting bolt 58 is attached to the guide member 55 from above, and the guide member 55 is pulled up by the connecting bolt 58 so that the guide member 55 is fastened to the wheel support 40 from below. Although the example which comprised was shown, the connection bolt with which the guide member 55 is mounted | worn from below is employ | adopted, and the guide member 55 is pushed up by the connection bolt by the connection bolt, and it is comprised so that the guide member 55 may be fastened to the wheel support 40 from the downward direction May be.

(5) In the above-described embodiment, an example in which the guide member 55 is provided has been described. However, the guide member 55 may be omitted.

(6) In the above-described embodiment, the support portion 50 may be provided on the track frame 15, which is an example in which the support portion 50 is provided on the wheel support 40. Moreover, you may implement without providing the support part 50. FIG.

(7) In the above-described embodiment, an example is shown in which two grounding wheels 18 other than the closest land rolling wheel 18R are supported so as to be able to swing up and down against each other. A configuration may be adopted.

  The present invention is not limited to a combine crawler travel device, but can be applied to a crawler travel device installed in various vehicles such as a corn harvester and a transport vehicle. Further, the present invention can also be applied to a mini crawler traveling device installed in a tractor.

DESCRIPTION OF SYMBOLS 15 Track frame 16 Drive wheel 17 Tension wheel 18 Grounding wheel 18a Wheel body part 18R Near-distance ground wheel 20 Crawler belt 25 Rubber crawler belt main body 26 Core metal 26a Core metal protrusion 28 Support arm 40 Rolling wheel support 45 Position fixing mechanism 50 Support part 55 Guide member 56 One side attachment part (front side attachment part)
57 Rear side attachment part (rear side attachment part 58 Fastener 59 Fastener 68 Stopper P Horizontal axis X Rotation axis

Claims (8)

Driving wheels,
A tension wheel rotatably supported by the track frame at a position away from the driving wheel in the front-rear direction of the track frame;
Between the drive wheel and the tension wheel, a plurality of grounding wheels rotatably supported by the track frame in a state of being aligned in the front-rear direction,
A crawler belt wound around the drive wheel, the tension wheel and the grounding wheel,
The crawler belt is provided with a rubber crawler belt main body, and a plurality of metal cores embedded in the rubber crawler belt main body in a state of being spaced along the circumferential direction of the rubber crawler belt main body,
The cored bar is provided with a pair of left and right cored bar projections projecting to the inner peripheral side of the rubber crawler belt body,
The left and right sides that support and act on the inner peripheral surface of the rubber crawler belt main body at locations that are separated from both the outer sides in the width direction of the rubber crawler belt main body with respect to the pair of left and right core metal protrusions A pair of ring bodies is provided,
A plurality of the grounded wheels are provided at a location closest to the tension wheel, and are provided with a close proximity ground wheel that is located at a use position and acts on the crawler belt,
The crawler traveling device is capable of changing the position of the closest land rolling wheel from the use position. The track frame was supported by the track frame so as to be able to move up and down across an ascending position for supporting the nearest-neighboring land rolling wheel at an ascending action position as the use position and a descending position for supporting the nearest-neighboring land rolling wheel at a descending action releasing position. A wheel support is provided,
A position fixing mechanism capable of switching between a fixed action state in which the wheel support is fixed at the raised position and an action release state in which the wheel support is allowed to descend to the lowered position is provided. Item 2. The crawler traveling device according to Item 1.   The crawler travel according to claim 2, further comprising a stopper that is supported by the track frame and that abuts against the rolling wheel support body and restricts the closest ground rolling wheel from being lifted from the rising action position. apparatus.   When the position fixing mechanism is in the fixing action state and the crawler belt is in a tensioned state, in a side view of the track frame, the lower part of the tensioning wheel and the upper part of the ring body part of the closest proximity rolling wheel The crawler traveling device according to claim 2 or 3, wherein   The crawler traveling device according to any one of claims 2 to 4, wherein when the roller support is in the lowered position, the closest ground roller does not overlap with the tension wheel in a side view of the track frame. A support arm that extends from the track frame and supports the tension ring;
The crawler traveling device according to any one of claims 2 to 5, wherein the roller support is provided with a support portion that receives and supports the support arm from below. The wheel support is a swing member that is supported by the track frame so as to be swingable up and down about a lateral axis in a direction along the track frame, and that supports the nearest ground wheel on the free end side. Yes,
A guide member is provided below the roller support and the nearest ground wheel, and a guide member that guides the core metal protrusion between the pair of left and right core metal protrusions.
The said guide member is supported by the said rolling-wheel support body in the state over the position corresponding to the said horizontal axis, and the position corresponding to the rotating shaft center of the said nearest land rolling wheel. The crawler traveling device according to item. The one side portion of the guide member in the front-rear direction is provided with left and right one-side attachment portions, and the other side portion of the guide member in the front-rear direction is provided with the other side attachment portion.
The left and right one side mounting parts are fixed by tightening upward from below with a fastener to the left side part and the right side part on one side of the wheel support,
The crawler traveling device according to claim 7, wherein the other-side attachment portion is fixed to the other-side end portion of the roller support by tightening a fastener along the lateral axis side.

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