JP6895875B2 - Crawler traveling device - Google Patents

Description

The present invention includes a crawler traveling device, specifically, a drive wheel, a tension wheel rotatably supported by the track frame at a position rotatably supported by the track frame at a position separated from the drive wheel in the front-rear direction of the track frame, and the drive wheel and the drive wheel. A plurality of ground wheels rotatably supported by the track frame in a state of being aligned in the front-rear direction between the tension wheels, and a crawler wound around the drive wheels, the tension wheels, and the ground wheels. A belt is provided, and the crawler belt is provided with a rubber crawler belt main body and a plurality of cores embedded in the rubber crawler belt main body at intervals along the circumferential direction of the rubber crawler belt main body. The core metal is provided with a pair of left and right core metal protrusions protruding toward the inner peripheral side of the rubber crawler belt body, and the ground wheel is provided with the rubber crawler with respect to the pair of left and right core metal protrusions. The present invention relates to a crawler traveling device provided with a pair of left and right wheel bodies that support the inner peripheral surface of the rubber crawler belt body at locations that are separated from each other in the width direction of the belt body.

In the above-mentioned crawler traveling device, for example, as shown in Patent Document 1, the grounding wheel closest to the tension wheel among the plurality of grounding wheels (in the publication, the last grounding wheel) cannot move up and down to the track frame. Some are configured to support the crawler belt in a fixed state.

Japanese Unexamined Patent Publication No. 2012-184005

As the diameter of the tension ring is increased, the curvature of the crawler belt portion that hangs on the tension ring becomes smaller, and the crawler belt becomes less likely to hurt. The higher the ground contact wheel closest to the tension wheel (hereinafter referred to as the ground wheel in the immediate vicinity) with respect to the ground wheel adjacent to the ground wheel, the closer the ground wheel to the ground wheel adjacent to the ground wheel and the ground wheel adjacent to the ground wheel. It becomes difficult for a strong ground reaction force to be applied to the crawler belt portion over the crawler belt, and it becomes difficult to receive resistance when turning.
In a crawler traveling device that supports the crawler belt while fixing the ground rolling wheels in close proximity to the track frame so that they cannot be raised and lowered, the diameter of the tension wheel is increased, or the ground rolling wheels in close proximity are positioned higher than the adjacent ground rolling wheels. Then, the tension wheel is adjusted to the tension position, and when the crawler belt is in the tension state, the tension wheel is separated from the ground wheel in the immediate vicinity and the lower part of the tension wheel is the left and right wheel parts of the ground wheel in the immediate vicinity. Even if it does not get in between the upper parts of the body, when the tension wheel is adjusted to the relaxed position and the crawler belt is in the slackened state, the tension wheel approaches the ground rolling wheel in the immediate vicinity, so the lower part of the tension wheel is closest. It may enter between the upper parts of the left and right wheel bodies of the grounding wheel, and the lower part of the tension wheel and the upper part of the wheel body part may overlap in the side view of the track frame.
In addition, depending on the size of the diameter of the tension wheel and the height position of the ground rolling wheel in close proximity, the lower part of the tension wheel is between the upper parts of the left and right wheels of the rolling wheel in close proximity even when the crawler belt is in tension. It gets in between and the lower part of the tension ring and the upper part of the ring body overlap. In this case, when the tension wheel is adjusted to the relaxed position and the crawler belt is in the slackened state, the tension wheel approaches the ground wheel in the immediate vicinity, so that the lower part of the tension wheel is the left and right wheel bodies of the ground wheel in the immediate vicinity. It goes deeper between the upper parts of the belt, and the overlap between the lower part of the tension ring and the upper part of the ring body becomes larger.
When removing the crawler belt, even if the crawler belt is in a slackened state, if the rolling wheel in close proximity and the tension wheel overlap and the tension wheel remains supported by the track frame, the tension wheel becomes an obstacle. It is difficult to remove.

The present invention provides a crawler traveling device in which the crawler belt can be easily removed while the crawler belt can be supported by the ground rolling wheel near the tension wheel.

The crawler traveling device according to the present invention
With the drive wheels
A tension wheel rotatably supported by the track frame at a position separated from the drive wheel in the front-rear direction of the track frame.
A plurality of ground rolling wheels rotatably supported by the track frame in a state of being aligned in the front-rear direction between the driving wheels and the tension wheels.
The driving wheel, the tension wheel, and the crawler belt wound around the grounding wheel are provided.
The crawler belt is provided with a rubber crawler belt main body and a plurality of core metal embedded in the rubber crawler belt main body at intervals along the circumferential direction of the rubber crawler belt main body.
The core metal is provided with a pair of left and right core metal protrusions protruding toward the inner peripheral side of the rubber crawler belt body.
The left and right sides that support the inner peripheral surface of the rubber crawler belt body at locations that are divided on both outer sides of the rubber crawler belt body in the width direction with respect to the pair of left and right core metal protrusions on the grounding wheel. Equipped with a pair of ring parts,
The plurality of grounding wheels are provided with a ground rolling wheel that is provided at a position closest to the tension wheel, is located at a position of use, and acts on the crawler belt.
The position of the ground wheel in the immediate vicinity can be changed from the position of use, and the position can be changed.
An ascending position that supports the immediate proximity ground rolling wheel to the ascending action position as the use position, and a descending position that supports the immediate proximity ground rolling wheel to the lowering action release position as a maintenance position when removing the tension wheel. The track frame is provided with a wheel support that is supported so as to be able to move up and down.
A position fixing mechanism capable of switching between a fixing action state for fixing the position of the wheel support at the ascending position and an action releasing state for allowing the rolling wheel support to be lowered to the lowering position is provided.

According to this configuration, the ground rolling wheel in the immediate vicinity of the use position acts on the crawler belt near the tension wheel. By changing the position of the immediate proximity ground wheel from the position of use, the position of the immediate proximity ground wheel changes to the side where the action on the crawler belt is released, so the direct proximity ground wheel is moved to the side where the overlap with the tension wheel is released. The tension ring can be removed.

Therefore, although the crawler belt can be supported by the ground rolling wheel in close proximity to the tension wheel, when the crawler belt is removed, the tension wheel can be removed so as not to be an obstacle, and the crawler belt can be easily removed.

According to this configuration, by switching the position fixing mechanism to the fixing action state, the wheel support is fixed in the ascending position by the position fixing mechanism, and the ground rolling wheel in the immediate vicinity is fixed in the ascending action position. The ground wheel can be fixed to the track frame so that it cannot move up and down and act on the crawler belt.
By switching the position fixing mechanism to the action release state, the wheel support is allowed to descend to the lowering position, and the ground rolling wheel in the immediate vicinity is lowered to the lowering action release position as a maintenance position when removing the tension wheel. Therefore, when the tension wheel is adjusted to the relaxed position and the crawler belt is in the loosened state, even if the wheel body of the ground rolling wheel located in the ascending action position and the tension ring overlap. By lowering the ground wheel in the immediate vicinity to the position where the lowering action is released, the wheel in the immediate vicinity can be lowered with respect to the tension wheel, and the wheel in the immediate vicinity can be moved to the side where the overlap with the tension wheel is released. Easy to remove the tension ring.

In the present invention, it is preferable that a stopper is provided that is supported by the track frame and that comes into contact with the wheel support to prevent the ground wheel in the immediate vicinity from rising above the ascending action position. is there.

According to this configuration, when the wheel support is raised and the wheel support hits the stopper, the ground rolling wheel in the immediate vicinity is in the raising action position. Therefore, the position fixing mechanism is simply raised by raising the wheel support until it hits the stopper. Is in a state where it can be switched to the fixed action state. Adjusting the position fixing mechanism to a state in which it can be switched to the fixed action state The position fixing mechanism can be easily switched to the fixed action state without any special effort, and the ground rolling wheel in close proximity can be held 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 the tension state, the lower part of the tension wheel and the ground rolling wheel in close proximity to the ground wheel are said to be in the side view of the track frame. It is preferable that the upper part of the ring portion overlaps.

According to this configuration, when the immediate proximity ground wheel is located in the ascending action position and the tension wheel is located in the tension position, the upper part of the immediate proximity ground wheel and the lower part of the tension ring overlap, so that the tension is higher than that of the non-overlapping one. The diameter of the wheel can be increased to make the crawler belt body less painful, and the height of the adjacent ground rolling wheel to the adjacent ground rolling wheel can be increased to suppress the resistance applied to the crawler belt from the ground when turning.

In the present invention, when the rolling wheel support is in the descending position, it is preferable that the ground rolling wheel in the immediate vicinity does not overlap with the tension wheel in the side view of the track frame.

According to this configuration, when removing the tension wheel, the tension wheel is less likely to come into contact with the ground rolling wheel located in the lowering release position, and is easy to remove.

In the present invention, it is preferable that the support arm extending from the track frame and supporting the tension wheel is provided, and the rolling wheel support is provided with a support portion that receives and supports the support arm from below. Is.

According to this configuration, the tension of the crawler belt applied to the tension wheel acts as an operating force for pulling down the support arm with respect to the support arm, but the support arm can be firmly received and supported by the support portion against the pulling operation force. it can. The wheel support can be used as a support member and can be obtained at low cost.

In the present invention, the rolling wheel support is supported by the track frame so as to swing up and down around the lateral axis in the direction along the lateral direction of the track frame, and supports the ground rolling wheel in the immediate vicinity on the free end side. A swing member that is arranged below the rolling wheel support and the ground rolling wheel in the immediate vicinity, and is provided with a guide member that guides the core metal protrusions between the pair of left and right core metal protrusions. It is preferable that the member is supported by the rolling wheel support in a state corresponding to the position corresponding to the lateral shaft core and the position corresponding to the rotating shaft core of the ground rolling wheel in the immediate vicinity.

According to this configuration, the guide member has a long length extending from the position corresponding to the lateral axis of the wheel support to the position corresponding to the rotation axis of the wheel in the immediate vicinity, and the crawler belt is engaged with the wheel in the immediate vicinity. It can be properly guided by the guide member so as to match. The guide member can be fixed to the track frame with a connecting structure that can be inexpensively obtained by utilizing a wheel support for the connecting member that connects the guide member to the track frame.

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

According to this configuration, since the guide member is tightened and connected to the wheel support at three points, it can be fixed stably, and the tightening direction on one side of the guide member and the tightening direction on the other side intersect. Therefore, it is possible to respond firmly to twisting and the like, and the guide member can be firmly fixed to the wheel support by a few fasteners.

It is a left side view which shows the whole combine. It is a side view which shows the ground rolling wheel, and the ground rolling wheel in the immediate vicinity of the ascending action position. It is a side view which shows the ground rolling wheel in the immediate vicinity of the descending action release position. It is a rear view which shows the ground rolling wheel in the immediate vicinity. It is a top view which shows the rolling wheel support structure in a partially cutout state. It is a perspective view which shows the grounding wheel and a tension wheel. It is a perspective view which shows the rolling wheel support and a guide member. It is a top view which shows the whole of the guide member. It is a side view which shows the grounding wheel and a crawler guide. It is a top view which shows the connection structure of a rocking link and a hydraulic cylinder. It is a vertical sectional front view which shows the support structure of a driving part. It is a side view which shows the rear part of the crawler traveling device which has another embodiment structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A case where the crawler traveling device according to the embodiment of the present invention is applied to the 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 1, the direction [R] is defined as the rear side of the traveling machine 1, the front side of the paper is defined as the left side of the traveling machine 1, and the back side of the paper is defined as the right side of the traveling machine 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. A cutting unit 5 is connected to the front portion of the machine frame 4 so as to be swingable and elevant in a descending working state and a non-raising working state. The raising and lowering operation of the cutting unit 5 is performed by the expansion and 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 1.

In this combine, crops such as rice and wheat can be harvested by running the traveling machine 1 in a state where the cutting unit 5 is lowered to the lowering work state.
That is, when the work is carried out, the planting culm located in front of the traveling machine body 1 is raised and processed by the raising device 9 in the cutting unit 5. The root of the planted culm to be raised and processed is cut by a clipper-type cutting device 10 to perform cutting. The harvested culm is supplied to the front part of the threshing device 7 by the supply and transport device 11. In the threshing device 7, the root side of the harvested culm is sandwiched and transported backward by a threshing feed chain (not shown), and the tip side of the harvested culm is supplied to the handling chamber (not shown) to rotate. Threshed by (not shown). After the grains obtained by threshing are sorted from dust such as straw waste, they are supplied to the grain tank 8 and stored. The stored grains can be taken out from the grain tank 8 by the grain unloading 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 rearward of the drive wheel 16. And nine ground contact wheels 18 provided between the drive wheels 16 and the tension wheels 17, and two upper wheels 19 provided between the drive wheels 16 and the tension wheels 17. .. The 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 airframe frame 4 via the front and rear swing links 21. The later swing link 21 and the track frame 15 are connected via a cancel link 22 (see FIG. 2). The drive wheels 16 are rotatably supported by the mission case 23, and are supported by the airframe frame 4 via the mission case 23. The nine ground rolling wheels 18 are rotatably supported by the track frame 15 in a state where they are arranged side by side at intervals in the front-rear direction of the track frame 15. The two upper rolling wheels 19 are rotatably supported by the support portion of the airframe frame 4. The tension wheel 17 is rotatably supported by a rear end side portion of the track frame 15.

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

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 vertically overlapped and connected.

As shown in FIGS. 2 and 4, the crawler belt 20 includes a rubber crawler belt main body 25 and a plurality of core metal 26s embedded in the rubber crawler belt main body 25. The plurality of core metal 26s 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 end sides of the left and right core metal protrusions 26a project 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 adduction wheel so as to support the crawler belt 20 between the left and right core metal protrusions 26a.

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

The tension ring support portion 27 is formed of a groove-shaped member 27a having a vertical cross-sectional shape that opens downward and a plate-shaped connecting member 29 that closes the openings at both front and rear ends of the groove-shaped member 27a, and has a tubular 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. The front end side portion of the support arm 28 is slidably fitted in the tension wheel support portion 27. The support arm 28 is slidably supported in the front-rear direction of the track frame 15.

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

In the tension adjusting mechanism 32, when the adjusting screw shaft 33 is rotated, the adjusting screw shaft 33 moves in the front-rear direction with respect to the screw shaft support portion 34, and the arm operating portion 35 is moved and operated by the adjusting screw shaft 33. The support arm 28 is slid back and forth. Therefore, by rotating the adjusting screw shaft 33, the tension wheel 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 ground rolling wheels 18 are provided with a pair of left and right wheel body portions 18a 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 body portions 18a are located on both outer sides of the rubber crawler belt main body 25 in the lateral width direction with respect to the pair of left and right core metal protrusions 26a, and the rubber crawler belt. It acts as a support on the inner peripheral surface of the main body 25. The nine grounding wheels 18 are configured as so-called abducting wheels so as to support the crawler belt 20 on both lateral outer sides of the pair of left and right core metal protrusions 26a.

As shown in FIG. 1, of 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 sixth The two ground rolling wheels 18, the seventh and eighth ground rolling 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 37a is formed in a portion of the balance support 37 located between the supporting portions of the two ground rolling wheels 18. The balance support 37 is swingably supported by the track frame 15 by the connecting boss portion 37a. The two ground rolling wheels 18 supported by each balance support 37 move up and down reciprocally with respect to the track frame 15 due to the swing 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 26a and guides the left and right core metal protrusions 26a so as to pass between the left and right wheel body portions 18a of the ground rolling wheel 18. The crawler belt 20 is guided by the crawler guide 38 so as to engage with the ground rolling wheel 18.

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

As shown in FIG. 7, the rolling 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 extending end portion of the arm portion 40b. It is a swinging member equipped with. As shown in FIGS. 2 and 5, the connecting boss portion 40a is supported so as to be fitted onto the support shaft 41 of the track frame 15 so as to be relatively rotatable. The connecting boss portion 40a is maintained in the outer fitting state by the retaining body 43 attached to the support shaft 41 by the connecting bolt 42. The support shaft 18b of the ground rolling wheel 18R in direct proximity 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 the lateral axis P in the direction along the track frame lateral direction of the support shaft 41 as a swing fulcrum. It is possible to swing up and down over the lowering position shown in 3. The ground rolling wheel 18R in close proximity is supported by the support boss portion 40c. The ground rolling wheel 18R in close proximity is swung up and down with respect to the track frame 15 by the swinging wheel support 40 with the axis of the support shaft 41 as the swing fulcrum.
As shown in FIG. 2, by raising the rolling wheel support 40 to the ascending position, the immediate proximity ground rolling wheel 18R is raised to the ascending action position as the used position, and the direct proximity ground rolling wheel 18R is raised. The position can be supported by the wheel support 40. As shown in FIG. 3, by lowering the rolling wheel support 40 to the lowering position, the immediate proximity ground rolling wheel 18R is lowered to the lowering action releasing position, and the direct proximity ground rolling wheel 18R is moved to the lowering action releasing position. It can be supported by the wheel support 40.

In this embodiment, in order to change the position of the ground rolling wheel 18R in the immediate vicinity of the used position to the side where the overlap with the tension wheel 17 is released, the position changing means for lowering the ground rolling wheel 18R in the direct proximity is adopted. Not limited to the configuration, a position changing means for removing the ground rolling wheel 18R in close proximity from the track frame 15 may be adopted. That is, the "position change from the position where the ground wheel in the immediate vicinity is used" in the present invention also includes the "removal of the wheel in the ground in the immediate vicinity".

As shown in FIGS. 2 and 7, a position fixing mechanism 45 is provided over 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 40d is formed on the wheel support 40.

As shown in FIG. 2, the two fixing bolts 46 are mounted in the screw holes 47a of the positioning portion 47 through the bolt holes of the bolt mounting portion 40d. The fixing bolt 46 engages with the screw hole 47a and is held by the positioning portion 47, and the wheel support 40 is stopped by the fixing bolt 46. As a result, the position fixing mechanism 45 is put into the fixing action state, and the wheel support 40 is fixed in the ascending 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 40d, the detent of the rolling wheel support 40 by the fixing bolts 46 is released. As a result, the position fixing mechanism 45 is released from the action and allows the rolling wheel support 40 to descend to the descending position.

Normally, as shown in FIG. 2, the tension adjusting mechanism 32 is adjusted to the tension side by the rotation operation of the adjusting screw shaft 33 to position the tension ring 17 in the tension position, and the crawler belt 20 is moved by the tension ring 17. Keep in a driveable tension state. Further, as shown in FIG. 2, the position fixing mechanism 45 is switched to the fixed action state to fix the position of the wheel support 40 at the ascending position, and the tension of the crawler belt 20 acting on the ground rolling wheel 18R in close proximity is resisted. Then, the ground rolling wheel 18R in the immediate vicinity is fixed to the ascending action position by the rolling 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 tension state, the lower part of the tension ring 17 is the left and right wheels of the ground rolling wheel 18R in close proximity. It enters between the upper parts of the body portion 18a, and in the side view of the track frame 15, the lower portion of the tension wheel 17 and the upper portion of the wheel body portion 18a of the ground rolling wheel 18R in close proximity overlap each other.

When removing the tension ring 17, as shown in FIG. 3, the adjusting screw shaft 33 is rotated to operate the tension adjusting mechanism 32 to the slack side, the tension wheel 17 is adjusted to the slack 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 to switch the position fixing mechanism 45 to the action release state, the wheel support 40 is lowered to the lower position, and the immediate proximity ground rolling wheel 18R is set to the lower action release position. It is lowered to release the overlap between the wheel body portion 18a of the ground rolling wheel 18R in close proximity and the tension wheel 17. When the overlap is eliminated, the support shaft 17a of the tension ring 17 is pulled out rearward from the notch hole 28b of the wheel body support portion 28a, and the tension ring 17 is taken out laterally from between the wheel 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 portion of the wheel support body 40. The support arm 28 is received and supported from below by the support portion 50. The tension of the crawler belt 20 applied to the tension wheel 17 acts on the support arm 28 as an operating force for lowering the support arm 28, but the support arm 28 is firmly received and supported by the support portion 50 against the pulling operation force.

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

As shown in FIGS. 2 and 4, the guide member 55 is arranged below the rolling wheel support 40 and the ground rolling wheel 18R in close proximity. The guide member 55 is supported by the rolling wheel support 40 in a state corresponding to a position corresponding to the lateral shaft core P and a position corresponding to the rotating shaft core X of the ground rolling wheel 18R in close proximity.
As shown in FIG. 4, the guide member 55 enters between the left and right core metal protrusions 26a and guides the left and right core metal protrusions 26a so as to pass between the left and right ring bodies 18a of the ground rolling wheel 18R in close proximity. To do.
The crawler belt 20 is guided by the guide member 55 so as to engage with the ground rolling wheel 18R in close proximity.

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

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

In this embodiment, screw holes are formed in the wheel support 40 and only connecting bolts 58 and 59 are used. However, screw holes are not formed in the wheel support 40 and connecting bolts and nuts are used. It is possible. Further, not limited to bolts, various fasteners such as rivets can be adopted.

As shown in FIGS. 1 and 2, the balance support 37 that supports the 7th and 8th ground rolling 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, the balance support 37 (hereinafter, referred to as the front balance support 37) supporting the first and second ground rolling wheels 18 from the front, and the third and fourth from the front. A balance support 37 that supports the grounding wheel 18 (hereinafter, referred to as a front balance support 37), and a balance support 37 that supports the fifth and sixth grounding wheels 18 from the front (hereinafter, front balance support). In each of the bodies 37), the distance between the rotation axes of the two grounding wheels 18 supported by the front balance support 37 is L1, and the seventh and eighth grounding wheels 18 from the front. If the distance between the rotating shaft cores of the two ground rolling wheels 18 supported by the balance support 37 (hereinafter, referred to as the rear balance support 37) that supports the above is L2, the distance L2 is greater than the distance L1. Is also set long. 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 wheel support 40 becomes narrower, and the crawler belt 20 is grounded by the ground rolling wheel 18 and the ground rolling wheel 18R. It can be hard to come off from such things.

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

FIG. 10 is a plan view showing a connection structure of the front and rear swing links 21 and the hydraulic cylinder 60 that swings the swing links 21. The connecting structure consists of a swing arm 61 that is interlocked with 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 lateral sides, and left and right connecting members. A connecting shaft 63 mounted on the swing arm 61 and the swing arm 61 is provided. The left and right connecting members 62 are connected to the tip of the cylinder rod 60a of the hydraulic cylinder 60. The detent member 63a is connected to one of the connecting members 62 and one end of the connecting shaft 63. The rotation stop member 63a prevents the connecting shaft 63 from rotating and pulling out. A bush 64 that smoothes the relative rotation between the swing arm 61 and the connecting shaft 63 is interposed between the boss portion of the swing arm 61 and the connecting shaft 63.

FIG. 11 is a vertical sectional front view showing a support structure of the operation unit 3. A pair of left and right driver frames 65 that support the cabin of the driver 3 and the control panel are provided on the lateral side of the fuselage frame 4. The left and right driving unit frames 65 are made of a pipe material extending in the front-rear direction of the machine body. The airframe frame 4 is provided with a main frame 66 extending in the front-rear direction of the airframe. The main frame 66 is made of a pipe material and supports the track frame 15 (see FIG. 1) via 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 laterally inner side of the machine body is mounted 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 adopted, but the spacer member 67 may not be adopted.

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

When the rolling wheel 18R in close proximity is returned from the lowering action release position to the ascending action position, when the rolling wheel support 40 is raised and positioned in the ascending position, the bolt mounting portion 40d of the rolling wheel support 40 comes into contact with the stopper 68. The stopper 68 regulates that the ground rolling wheel 18R in close proximity rises above the ascending action position. In this restricted state, the bolt hole for mounting the fixing bolt 46 in the bolt mounting portion 40d and the screw hole 47a (see FIG. 7) in the positioning portion 47 match, and the position fixing mechanism 45 uses the fixing bolt 46. It will be in a state where it can be switched to the fixed action state simply by attaching it. That is, when the wheel support 40 is raised until the stopper 68 comes into contact with the wheel support 40, the position fixing mechanism 45 is in a state where it can be switched to the fixing action state. As a result, the position fixing mechanism 45 can be switched to the fixed action state and the ground contact is immediately close to the ground without 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 ring can be held in the ascending action position.

[Another Embodiment]
(1) In the above-described embodiment, an example is shown in which the rolling wheel support 40 is composed of a swinging member and the ground rolling wheel 18R in the immediate vicinity moves up and down by swinging, but the rolling wheel support 40 slides. A configuration may be adopted in which the support is configured to move up and down, and the ground rolling wheel 18R in close proximity moves up and down in a straight line.

(2) In the above embodiment, when the tension wheel 17 is adjusted to the tension position and the crawler belt 20 is in the tension state, the tension wheel 17 and the wheel body portion 18a of the ground rolling wheel 18R in close proximity overlap each other. When the crawler belt 20 is in a tense state, the tension wheel 17 and the wheel body portion 18a of the ground rolling wheel 18R in close proximity do not overlap, and the tension wheel 17 is moved from the tension position to the relaxation position. When the crawler belt 20 becomes loose, the tension wheel 17 and the wheel body portion 18a of the ground rolling wheel 18R in close proximity may overlap each other.

(3) In the above-described embodiment, the drive 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. It is possible to adopt a configuration in which the tension wheel 17 is located on the front side and is located on the side.

(4) In the above 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 tightened to the wheel support 40 from below to above. Although the configuration example is shown, a connecting bolt to be attached to the guide member 55 from below is adopted, and the guide member 55 is pushed up by the connecting bolt to tighten the guide member 55 to the wheel support 40 from below to above. You may.

(5) In the above-described embodiment, an example in which the guide member 55 is provided is shown, but the guide member 55 may not be provided.

(6) In the above-described embodiment, the support portion 50 may be provided on the track frame 15, which shows an example in which the support portion 50 is provided on the wheel support 40. Further, it may be carried out without providing the support portion 50.

(7) In the above-described embodiment, an example is shown in which two grounding wheels 18 other than the ground rolling wheel 18R are supported so as to be able to swing up and down in a contradictory manner. The configuration to be used may be adopted.

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

15 Track frame 16 Drive wheel 17 Tension wheel 18 Grounding wheel 18a Wheel body 18R Close-up ground wheel 20 Crawler belt 25 Rubber crawler belt 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 mounting part (front side mounting part)
57 Rear mounting part (rear mounting part)
58 Fastener 59 Fastener 68 Stopper P Lateral shaft core X Rotating shaft core

Claims (7)

With the drive wheels
A tension wheel rotatably supported by the track frame at a position separated from the drive wheel in the front-rear direction of the track frame.
A plurality of ground rolling wheels rotatably supported by the track frame in a state of being aligned in the front-rear direction between the driving wheels and the tension wheels.
The driving wheel, the tension wheel, and the crawler belt wound around the grounding wheel are provided.
The crawler belt is provided with a rubber crawler belt main body and a plurality of core metal embedded in the rubber crawler belt main body at intervals along the circumferential direction of the rubber crawler belt main body.
The core metal is provided with a pair of left and right core metal protrusions protruding toward the inner peripheral side of the rubber crawler belt body.
The left and right sides that support the inner peripheral surface of the rubber crawler belt body at locations that are divided on both outer sides of the rubber crawler belt body in the width direction with respect to the pair of left and right core metal protrusions on the grounding wheel. Equipped with a pair of ring parts,
The plurality of grounding wheels are provided with a ground rolling wheel that is provided at a position closest to the tension wheel, is located at a position of use, and acts on the crawler belt.
The position of the ground wheel in the immediate vicinity can be changed from the position of use, and the position can be changed.
An ascending position that supports the immediate proximity ground rolling wheel to the ascending action position as the use position, and a descending position that supports the immediate proximity ground rolling wheel to the lowering action release position as a maintenance position when removing the tension wheel. The track frame is provided with a wheel support that is supported so as to be able to move up and down.
A crawler provided with a position fixing mechanism capable of switching between a fixing action state for fixing the position of the wheel support at the ascending position and an action releasing state for allowing the rolling wheel support to be lowered to the lowering position. Traveling device. The crawler running according to claim 1, wherein the crawler running is supported by the track frame and is provided with a stopper that comes into contact with the wheel support and regulates the ground rolling wheel in close proximity to rising above the ascending action position. apparatus. When the position fixing mechanism is in the fixing action state and the crawler belt is in the tension state, the lower part of the tension wheel and the upper part of the wheel body portion of the ground rolling wheel in close proximity to the track frame in a side view of the track frame. The crawler traveling device according to claim 1 or 2, wherein the crawler traveling device overlaps with the above. The crawler traveling device according to any one of claims 1 to 3, wherein when the rolling wheel support is in the descending position, the ground rolling wheel in the immediate vicinity does not overlap with the tension wheel in a side view of the truck frame. A support arm extending from the track frame and supporting the tension wheel is provided.
The crawler traveling device according to any one of claims 1 to 4, wherein the rolling wheel support is provided with a support portion that receives and supports the support arm from below. The rolling wheel support is a swinging member that is supported by the track frame so as to swing up and down around the lateral axis in the direction along the lateral direction of the track frame, and supports the ground rolling wheel in the immediate vicinity on the free end side. Yes,
A guide member is provided below the rolling wheel support and the ground rolling wheel in the immediate vicinity, and guides the core metal protrusions between the pair of left and right core metal protrusions.
Any one of claims 1 to 5 in which the guide member is supported by the wheel support in a state corresponding to a position corresponding to the lateral shaft core and a position corresponding to the rotation shaft core of the ground rolling wheel in the immediate vicinity. The crawler traveling device according to the section. One side portion of the guide member in the front-rear direction is provided with one left and right mounting portion, and the other side portion of the guide member in the front-rear direction is provided with the other side mounting portion.
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 fasteners.
The crawler traveling device according to claim 6, wherein the other side mounting portion is fixed to the other side end portion of the rolling wheel support by tightening a fastener along the lateral axis side.

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