JP2011218969A - Crawler type traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler type traveling device capable of enlarging a fall angle by improving elastic crawlers.SOLUTION: The crawler type traveling device includes: a pair of right and left crawler units 5 in which the elastic crawlers 9 are wounded around a driving wheel 6, an idler 7, and a track roller 8, wherein each of the right and left elastic crawlers 9 includes crawler bodies 10 formed into endless belts of the elastic bodies, and wounded around the driving wheel 6, the idler 7, and the track roller 8; and a pair of right and left track roller transit parts 17A, 17B in which the track roller 8 is rolled at an inner circumferential side of each of the right and left crawler bodies 10. The track roller transit part 17A of the outside O of the traveling device is provided with an inclined part 18 higher as getting closer to the outside O of the traveling device in the longitudinal direction X, so that the end side of the outside O of the traveling device in the longitudinal direction X of the track roller transit part 17A of the outside O of the traveling device of the crawler body 10 becomes higher than the end side of the inside I of the traveling device in the longitudinal direction X of the track roller transit part 17B of the inside I of the traveling device of the crawler body 10.

Description

  The present invention relates to a crawler type traveling device employed in a traveling unit of a working vehicle such as a construction machine such as a backhoe or a hydraulic excavator or an agricultural machine such as a combine.

A crawler type traveling device employed in a traveling portion of a work vehicle is provided with crawler units on both the left and right sides of a track frame on which the machine is mounted.
The crawler unit is formed by winding an endless belt-like elastic crawler over a drive wheel, an idler, and a wheel.
In a work vehicle that employs the crawler type traveling device, when a license plate is acquired to travel on a road, the regulation of the falling angle must be cleared.

As shown in FIG. 2, the falling angle is an inclination angle at which when the work vehicle 2 is tilted in the left-right direction, the work vehicle 2 cannot maintain the tilted posture due to its own weight and loses its balance and starts to fall. The greater the angle, the higher the stability of the work vehicle.
At present, the fall angle has become smaller due to the increase in weight due to the cost reduction of the crawler and the performance improvement of the machine of the work vehicle, and it has become difficult to clear the standard of this fall angle. Yes.

As countermeasures, we have responded by lowering the center of gravity of this machine or widening the foot width (increasing the width of rolling wheels, widening the track frame), but even if these countermeasures are implemented, the machine Due to structural restrictions, the fall angle standard may not be cleared.
In this case, it may be possible to cope with the problem by changing the structure of the elastic crawler. As an example, the elastic part in which the meshing part of the elastic crawler with the drive wheel is offset from the crawler width direction center to the outside in the left-right direction. There is a crawler (see Patent Documents 1 and 2).

  By adopting this elastic crawler, the space between the driving wheels of the left and right crawler units is widened without widening the left and right width of the crawler type traveling device, and the fall angle can be increased.

JP-A-10-250650 JP 2003-2264 A

Even if the elastic crawlers described in Patent Documents 1 and 2 are implemented, the regulation of the falling angle may not be cleared.
In that case, a countermeasure with an elastic crawler is further required.
Then, this invention makes it a subject to provide the crawler type traveling apparatus which can enlarge a fall angle by improving the structure of an elastic crawler.

The technical means taken by the present invention in order to solve the technical problem comprises a pair of left and right crawler units in which an elastic crawler is wound around a drive wheel, an idler and a wheel, and the left and right elastic crawlers are elastic bodies. A crawler body that is formed in an endless belt shape and is wound around the drive wheel, idler, and wheel, and a crawler that includes a pair of right and left wheel passing portions on which the rollers roll on the inner peripheral surface side of the crawler body In the traveling device,
The end side of the crawler body outside of the traveling device on the outside of the left and right direction traveling device is higher than the end side of the inside of the crawler body on the inside of the traveling device on the left and right direction of the traveling device. Further, the present invention is characterized in that an inclined portion that becomes higher as it goes to the outer side of the lateral traveling device is provided in the wheel passing portion outside the traveling device.

Moreover, it is good to provide the said inclination part in each crawler main body on either side.
Moreover, it is good to make the inclination-angle of the said inclination part into the range of 1-5 degree | times.
The rubber hardness of the wheel passing portion provided with the inclined portion is preferably in the range of 68 to 85 degrees.
In addition, in the case where the elastic crawler includes a cored bar embedded in the crawler main body at intervals in the crawler circumferential direction, the inclined portion may be provided at a position corresponding to the space between the cored bars.

  When the work vehicle adopting the crawler type traveling device of the present invention is tilted in the left-right direction, the inclined portion provided on the wheel passing portion outside the traveling device of the lower crawler unit works in a direction to suppress the falling of the work vehicle, Thereby, the fall angle of the work vehicle can be increased.

(A) is sectional drawing of the elastic crawler of this embodiment, (b) is an enlarged view of an outer wheel passing part. It is a front view of the work vehicle which shows the grounding state on a flat ground and the grounding state on an inclined ground. (A) is a side view of a crawler type traveling device, (b) is a top view of a part of an elastic crawler of this embodiment. (A) is a partial top view of the elastic crawler which shows other embodiment, (b) is sectional drawing of the elastic crawler which shows another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a crawler type traveling device that is employed in a traveling portion of the work vehicle 2. This crawler type traveling device 1 is provided with crawler units 5 on both the left and right sides of a track frame 4 on which the machine 3 is mounted.
In the following description, the left-right direction X inner side I means the inner side I of the left-right direction X traveling device 1 (the left-right direction X center side of the traveling device 1), and the left-right direction X outer side O means the left-right direction X traveling device 1. Outside O (the opposite side of the left and right crawler unit 5 in the left and right direction X). The left-right direction X inward refers to the direction from the left-right direction X outer side O of the left-right crawler unit 5 to the left-right direction X inner side I of the left-right crawler unit 5, and the left-right direction X outer refers to the left-right crawler. A direction from the left / right direction X inner side I of the unit 5 toward the left / right direction X outer side O of the left / right crawler unit 5 is said.

As shown in FIG. 3A, the crawler unit 5 includes a sprocket 6 (driving wheel) disposed on one side of the front and rear, an idler 7 disposed on the other side of the front and rear, and between the sprocket 6 and the idler 7. And a plurality of rolling wheels 8 disposed on the sprocket 6, the idler 7, and an endless belt-like elastic crawler 9 wound around the rolling wheels 8.
The sprocket 6, the idler 7 and the wheel 8 are supported by the track frame 4 so as to be rotatable about the left and right axis, and the elastic crawler 9 has the band width direction aligned with the left and right direction X so that the sprocket 6, the idler 7 and the wheel. 8, when the sprocket 6 is rotationally driven, a driving force is transmitted from the sprocket 6 to the elastic crawler 9 so that the elastic crawler 9 circulates in the circumferential direction. It can run in the front-rear direction.

As shown in FIGS. 1 and 3, the elastic crawler 9 is formed in an endless belt shape by a rubber-like elastic body such as rubber and resin, and the crawler main body 10 wound around the sprocket 6, the idler 7, and the wheel 8. Have
On the outer peripheral side of the crawler body 10, lugs 11 that are in contact with the ground are provided over the entire circumference at intervals in the crawler circumferential direction Y.

Further, in the crawler main body 10, the cored bar 12 is embedded in the crawler circumferential direction Y with an interval in the crawler circumferential direction Y.
The core metal 12 and the lug 11 are provided at positions that substantially coincide with each other in the crawler circumferential direction Y.
At the central portion of the crawler main body 10 in the left-right direction X (band width direction), an engagement hole 13 that is located between the adjacent core bars 12 in the crawler circumferential direction Y and into which the teeth of the sprocket 6 are inserted is crawler circumferential Y It is provided all around.

In this embodiment, an elastic crawler 9 of a type in which a driving force is transmitted from the sprocket 6 to the cored bar 12 is illustrated, but the elastic crawler 9 is a driving protrusion provided on the inner peripheral side of the crawler body 10. Alternatively, it may be a projection drive type elastic crawler 9 of a type in which power is transmitted from the drive wheels.
The core metal 12 has a left-right direction X center portion located in the left-right direction X center portion of the crawler body 10 and a pair of left and right engaging projections 14 projecting to the inner peripheral side of the crawler at the center portion of the core metal 12. . The left and right engaging protrusions 14 have a function of preventing the elastic crawler 9 from coming off (disengagement of the elastic crawler 9) by engaging with the sprocket 6, the idler 7 and the wheel 8.

Further, the cored bar 12 has a pair of wing parts 15 extending from the left and right direction X center part to the left and right sides.
In the crawler body 10, left and right tensile bodies 16 that are positioned on the outer peripheral side of the crawler of each of the left and right wing parts 15 of the core metal 12 and surround the core metal 12 are embedded so as to cover the entire circumference of the crawler circumferential direction Y. ing.

The tensile body 16 is configured by arranging one end-end tensile cord made of steel cord or the like in the crawler circumferential direction Y and arranging it in parallel in the left-right direction X, or A spiral structure in which one tensile cord is wound in the crawler circumferential direction Y while shifting the position in the left-right direction X is employed.
Further, the tensile body 16 has a function of transmitting the driving force transmitted from the sprocket 6 to the core metal 12 to the entire circumference of the elastic crawler 9.

On the inner peripheral surface of each of the left and right crawler bodies 10, a pair of roller passing portions 17 </ b> A and 17 </ b> B where the straddling roller 8 rolls (runs) are provided in the left and right direction X.
The wheel passing portion 17A in the left and right direction X outer side O (hereinafter, simply referred to as the outer wheel passing portion 17A) is located on the left and right direction X outer side O of the engaging projection 14 in the left and right direction X outer side. The inner wheel passing portion 17B (hereinafter simply referred to as the inner wheel passing portion 17B) is located on the inner side I in the left-right direction X of the engaging protrusion 14 on the inner side I in the left-right direction X.

Further, each of the wheel passing portions 17A and 17B is provided at a position corresponding to the wing portion 15 and is provided continuously over the entire circumference Y of the crawler body 10.
The surface on the crawler inner peripheral side of the inner roller passage passage portion 17 </ b> B is formed as a flat surface along the left-right direction X.
Further, on the crawler inner peripheral side of the outer wheel passage passage portion 17A, the end portion of the outer wheel passage passage portion 17A on the lateral direction X outer side O is the end on the inner side wheel passage passage portion 17B in the lateral direction X inner side I. An inclined portion 18 is provided which becomes higher as it goes outward in the left-right direction X so as to be higher than the portion.

In the elastic crawler 9 shown in FIGS. 1 and 3B, the inclined portion 18 is provided continuously on the outer wheel passage passage portion 17A over the entire circumference of the crawler circumferential direction Y. The wheel passing portion 17A and the left-right direction X are provided with the same width.
That is, the height from the ground contact surface (distance from the ground contact surface) of the end in the left-right direction X inside I of the outer wheel passage passage portion 17A is the end of the inner wheel passage passage 17B in the left-right direction X outer side O. The height from the ground contact surface of the end of the outer side wheel passage portion 17A in the left-right direction X outer side O is the inner side in the left-right direction X of the inner wheel passage passage portion 17B. The end of I is higher than the height from the ground contact surface, and the surface on the crawler inner peripheral side of the outer wheel passage passage portion 17A extends from the end of the left and right direction X inner side I to the end of the left and right direction X outer side I. It is set as the inclined surface which transfers to a crawler inner peripheral side as it goes to a part.

  As shown in FIG. 2, when the work vehicle 2 is inclined such that one of the crawler units 5 is higher and the other is lower on an inclined ground, the wheel passing portion 17 </ b> A (a portion) on the outer side of the lower crawler unit 5. ) Is subjected to a large load from the wheel 8 side, and the other wheel passing portions 17A and 17B (b portion, c portion, and d portion) have the highest wheel passing portion 17A as the inclination angle of the inclined ground increases. (D part) The wheel 8 tries to float in order of the 2nd highest wheel passing part 17B (c part) and the 3rd highest wheel passing part 17B (b part).

At this time, since the inclined portion 18 provided in the wheel passing portion 17A of the a portion is an inclined surface that becomes higher as it goes from the higher side of the inclined land to the lower side with respect to the inclined land, the rotating wheel of the a portion. The inclination angle Z of the inclined portion 18 of the passage portion 17A cancels out the inclination angle of the inclined land, and the inclination portion 18 of the wheel passage passage portion 17A of the a portion acts to suppress the work vehicle 2 from falling. To do.
As a result, compared to the case where the outer wheel passage passage portion 17A does not have the inclined portion 18, the outer wheel wheel passage portion 17A has the inclined portion 18, so that the work vehicle 2 employing the crawler type traveling device 1 can be used. The falling angle is increased, and the stability of the work vehicle 2 is improved.

Here, if the inclined portion is provided in the inner roller passage passage portion 17B in a line-symmetrical manner with the center in the left-right direction X of the crawler body 10 as a boundary, the above-described overturning suppressing effect is reduced.
This is because the second highest roller passage passage portion 17B (c portion) and the third highest wheel passage passage portion 17B (b portion) from the highest wheel passage passage portion 17A (d portion) when inclined. In turn, the wheel 8 tends to float from the wheel passing portions 17A and 17B (the load from the wheel 8 gradually decreases from the portion d toward the portion b), and the wheel passing portion 17B of the portion b becomes the portion a. This is because it becomes a form that counteracts the fall-inhibiting action of the wheel passage portion 17A.

  Since the tipping angle of the work vehicle 2 does not know which is greater when it is tilted to the left or right, in order to reduce the tipping angle when the work vehicle 2 is tilted to the left or right, the outer side of each of the left and right elastic crawlers 9 It is preferable to provide the inclined portion 18 in the wheel passage portion 17A. In this case, since the wheel 8 first floats from the wheel passage passage portion 17A of the d portion (the load acting on the portion d is the smallest), the inclined portion 18 provided in the wheel passage passage portion 17A of the d portion. Is less likely to affect the fall-suppressing effect of the inclined portion 18 provided in the wheel passing portion 17A of the a portion.

In addition, you may provide the inclination part 18 only in one elastic crawler 9 on either side. That is, for example, when the work vehicle 2 is tilted to the left or right, when the tilt angle is larger when the work vehicle 2 is tilted to the left or right, the inclined portion 18 is provided so that the larger tilt angle is smaller. Just do it.
Further, the inclined portion 18 does not have to be continuously provided in the outer roller passage passage portion 17A over the entire circumference of the crawler circumferential direction Y, and is intermittent in the crawler circumferential direction Y as shown in FIG. May be provided.

In the elastic crawler 9 shown in FIG. 4A, the inclined portion 18 is provided at a position corresponding to between the core bars 12.
The crawler inner peripheral surface between the inclined portions 18 of the wheel passing portion 17A provided with the inclined portion 18 is a flat surface along the left-right direction X, and the surface on the inner peripheral side of the inner wheel passing portion 17B. Set to the same height.

Since the core metal 12 embedded portion has high rigidity and the lug 11 is provided, there is almost no drop of the wheel 8 when the roller 8 passes, and the wheel 8 has the core metal 12 embedded portion and the core metal 12. There is a large drop between the embedded portion of the cored bar 12 adjacent to the embedded portion.
Therefore, as in the embodiment shown in FIG. 4A, by providing the inclined portion 18 at a position corresponding to between the core bars 12, it is possible to suppress the rolling wheel 8 from dropping when rolling between the core bars 12. can do.

  Further, in order to suppress the drop of the rolling wheel 8 when passing between the core bars 12, the inner circumference of the crawler of the wheel passing parts 17A, 17B is interposed between the core bars 12 of the inner and outer wheel passing parts 17A, 17B. There is an elastic crawler 9 provided with a mount in which the side surface is raised toward the inner peripheral side of the crawler. In this elastic crawler 9, the inclined portion 18 is mounted on the mount of the outer wheel passage passage portion 17A. Provide.

Further, the inclined portion 18 needs to be provided so as to extend from the end in the left-right direction X inside I to the end in the outside O of the outer wheel passage passage portion 17A (over the entire width of the left and right width of the outer wheel passage passage portion 17A). Rather, it may be provided so as to increase from the middle in the left-right direction X of the outer wheel passage passage portion 17A to the outside in the left-right direction X.
The rubber hardness of the wheel passing portion 17A provided with the inclined portion 18 adopts 68 to 85 degrees when the shape of the inclined portion 18 is not easily crushed by the load from the wheel 8 at the time of inclination. It becomes easy to be done.

Further, as the inclination angle Z of the inclined portion 18 is increased, the effect of overturning suppression is increased, but the vibration is increased as the inclination angle Z of the inclined portion 18 is increased.
This is because if the inclined portion 18 is made too high, the wheel portion on the inner side I in the lateral direction X of the straddling wheel 8 tends to float, and the load from the machine 3 is applied to the wheel portion on the outer side 8 in the lateral direction X of the wheel. This is because, as a result, it becomes easier to widen the difference in rigidity between the cored bar 12 and the embedded part of the cored bar 12 and vibration is increased. In addition, the left and right balance of the wheel is lost and vibration is disturbed.

Therefore, in consideration of vibration, the inclination angle Z of the inclined portion 18 is preferably in the range of 1 to 5 degrees.
FIG. 4B shows an embodiment in which the inclined portion 18 is adopted in the elastic crawler 9 in which the pair of engaging protrusions 14 and the engaging holes 13 (meshing portions of the sprocket 6) are offset in the lateral direction X outside O. Show. About another structure, it is comprised similarly to the said embodiment.

Table 1 below shows the results of a fall test and a vibration test performed by changing the tilt angle Z of the tilted portion 18.
The test was performed on an elastic crawler in which the inner and outer roller passing portions 17A and 17B had a left-right width of 30 mm and the inclined portion 18 was provided continuously in the crawler circumferential direction Y.
Moreover, the test was done about what provided the inclination part 18 in the wheel passing part 17A of the outer side of each elastic crawler 9 on either side.

The vibration test was performed on a flat ground.
The numerical value in parentheses in each column of the inclination angle Z of the inclined portion 18 is the difference between the height of the wheel passing portion 17A and the height of the highest portion of the inclined portion 19 when the inclination angle Z is 0 °.
The fall index is expressed as an index when the fall angle when the inclined portion 18 is not provided is 100, and the fall index indicates that the fall angle increases as the numerical value increases.

  The vibration is obtained by measuring the vibration during traveling. The vibration index is expressed as an index when the vibration when the inclined portion 18 is not provided is 100. The smaller the numerical value, the more the vibration index is vibration. Is large.

From Table 1, it can be seen that as the inclination angle Z of the inclined portion 18 is increased, the falling angle increases, but the vibration also increases.
From the viewpoint of height, the inclined portion 18 is preferably 3 mm or less, and the inclination angle of the inclined portion 18 is preferably 3 mm or less and within a range of 1 to 5 degrees.
Further, in the case where the inclined portion 18 is provided between the core bars 12, if the height of the inclined portion 18 exceeds 3 mm, the rigidity between the core bars 12 may be higher than that on the core metal 12. In addition, the inclination angle of the inclined portion 18 is preferably set within a range of 1 to 5 degrees with a height of 3 mm or less.

Further, the present invention is not limited to the numerical values of the present embodiment, and by providing the inclined portion 18 only in the outer wheel passage passage portion 17A regardless of the inclination angle of the inclined portion 18, the fall angle can be improved. There is an effect.
Further, the inclined portion 18 is provided according to the type, size, and the like of the elastic crawler 9.

5 Crawler unit 6 Drive wheel (sprocket)
7 Idler 8 Roller 9 Elastic Crawler 10 Crawler Body 12 Core Bar 17A Outer Roller Passing Portion 17B Inner Roller Passing Portion 18 Inclined Part X Left-Right Direction Y Crawler Circumferential Z Inclined Angle of Inclined Part

Claims (5)

The left and right elastic crawlers (9) are provided with a pair of left and right crawler units (5) wound around an elastic crawler (9) across a drive wheel (6), idler (7) and rolling wheel (8). The crawler body (10) is formed in an endless belt shape and is wound around the drive wheel (6), idler (7) and roller (8), and the wheel is disposed on the inner peripheral surface side of the crawler body (10). In the crawler type traveling device provided with a pair of left and right wheel passing portions (17A, 17B) on which (8) rolls,
The end side of the crawler body (10) on the outer side (O) of the crawler body (10) is the inner side (I) of the crawler body (10). ) In the left and right direction (X) of the wheel passage passage portion (17B) of the wheel passing portion (17B) in the right and left direction so as to be higher than the end portion side on the inner side (I) of the traveling device. (X) A crawler type traveling device provided with an inclined portion (18) that increases as it goes to the outside (O) of the traveling device.   The crawler type traveling device according to claim 1, wherein the inclined portion (18) is provided in each of the left and right crawler bodies (10).   The crawler type traveling device according to claim 1 or 2, wherein an inclination angle (Z) of the inclined portion (18) is in a range of 1 to 5 degrees.   The crawler type traveling according to any one of claims 1 to 3, wherein a rubber hardness of the wheel passing portion (17A) provided with the inclined portion (18) is in a range of 68 to 85 degrees. apparatus.   The elastic crawler (9) includes a cored bar (12) embedded in the crawler main body (10) at intervals in the crawler circumferential direction (Y), and the inclined part (18) is connected to the cored bar (12 The crawler type traveling device according to any one of claims 1 to 4, wherein the crawler type traveling device is provided at positions corresponding to each other.

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