JP3386529B2 - Crawler wheel rolling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler wheel rolling device which employs both outer and inner wheels as grounding wheels to prevent low vibration and derailment.

[0002]

2. Description of the Related Art Generally, a crawler traveling device used in an agricultural work vehicle or the like includes a driving wheel (sprocket wheel), a driven wheel (idler), an endless belt wound around the driving wheel and the driven wheel, and It is provided with a plurality of ground rollers that roll on the inner peripheral side of the endless belt. As the endless belt, one illustrated in FIG. 5 is known (see, for example, Japanese Utility Model Publication No. 62-6941), and the endless belt 5 is made of an elastic material such as rubber and has a pair of left and right sides. A plurality of cores 52 having guide protrusions 51 for preventing wheel slippage are provided in the circumferential direction, and a sprocket engagement hole 53 for engaging the engagement claws of the drive wheels is provided at the center of the left and right between the cores 52. Further, a grounding lug 54 is provided on the grounding surface side so as to correspond to each core metal 52.

Further, a pair of left and right guide protrusions are provided on the grounding wheel.
There are two types: an inner wheel that rolls between the 51 and an outer wheel that rolls outside the pair of left and right guide protrusions 51. The inner wheel rolls between the left and right guide protrusions 51, and even if the endless belt 5 inclines with respect to the inner wheel when the vehicle runs on a sloping ground or climbs up an obstacle, Although it has the advantage of being difficult to perform, the guide protrusion 51 provided with the sprocket engaging hole 53 is provided.
It has a drawback that vibration occurs due to rolling between.

On the other hand, the outer wheel rolls on the outer side of the left and right guide protrusions 51, and rolls in a portion where the sprocket engaging hole 53 is not provided, so that it has an advantage of low vibration. However, when the endless belt 5 inclines, one side of the abduction wheel lifts up from the endless belt 5, and at this time the endless belt 5
Has a drawback that it tends to slip off along the slope, leading to derailment.

[0005]

Therefore, in order to reduce vibration while preventing derailment, a pair of front and rear inner and outer wheels are attached to the swing bracket in a front and rear direction, and the swing bracket is attached to the swing bracket. , A crawler rolling device configured to rotatably connect to a vehicle body in a front-rear halfway portion of an inner wheel and an outer wheel so that the inner wheel and the outer wheel swing up and down reciprocally. Conceivable.

According to the crawler roller wheel device having such a structure, when the endless belt is inclined with respect to the inner wheel and the outer wheel during traveling on a sloping ground, even if one side of the outer wheel is lifted, The dynamic bracket swings with respect to the vehicle body, and the inner wheel forming a pair with the outer wheel engages with the guide projection of the core metal without floating from the endless belt, thereby preventing wheel removal. However, when the inner wheel passes through the sprocket engagement hole of the endless body, the vibration is
After all, it is transmitted to the vehicle body through the swing bracket, and further vibration reduction is desired.

Therefore, it is an object of the present invention to further improve the vibration reduction while preventing the wheel from slipping off by the inner wheel attached to the swing bracket.

[0008]

In order to achieve the above object, the present invention takes the following technical means. That is,
The crawler wheel rolling device of the present invention includes a pair of left and right guide protrusions.
So as to pass through only the inner ring of the endless belt and the outer side of the pair of left and right guide protrusions.
And the abduction wheels that roll inner peripheral side of the endless belt is mounted on a pair and has been swung bracket before and after, rocking bracket, and is reciprocally said rolling wheel and abductor wheel It is attached to a swing bracket that is rotatably connected to the vehicle body in the front-rear midway between the inner and outer wheels so as to swing up and down. The front-rear horizontal distance between the wheel and the axle is larger than the front-rear horizontal distance between the rotation axis of the swing bracket and the outer wheel axle.

The inner wheel and the outer wheel mounted on the swing bracket are the outer wheel when the inner wheel rolls between cored bars provided at a predetermined pitch in the circumferential direction of the endless belt. It is preferable that the inner rotating wheel rolls on the core metal and is arranged at a position where the inner rotating wheel rolls on the core metal when the outer rotating wheel rolls between the core metals. Further, it is more preferable that the outer wheel attached to the swing bracket is a grounding wheel arranged at the frontmost or the rearmost of the plurality of grounding wheels connected to the vehicle body.

[0010]

[Function] Of the inner and outer wheels mounted on the swing bracket, the outer wheel rolls up and down on the left and right sides of the guide protrusions having no sprocket engaging holes, and therefore, moves up and down. However, since the inner wheel rolls only between the guide protrusions in which the sprocket engaging holes are formed, the vertical movement when passing through the sprocket engaging holes becomes relatively large.

However, the vibration of the vehicle body is caused by the vertical displacement of the pivot shaft of the swing bracket, and the front-rear horizontal distance between the pivot shaft of the swing bracket and the axle of the inner wheel swings. Since the distance between the rotation axis of the bracket and the axle of the outer wheel in the front-rear horizontal direction is made larger, the vertical displacement of the rotation axis of the swing bracket is reduced as much as possible. Therefore, the vibration can be reduced.

Further, since the swing bracket to which the inner and outer wheels are attached is rotatable with respect to the vehicle body, the swing bracket is mounted so that both the inner and outer wheels are grounded. Since it rotates, the inner wheel always rolls on the inner peripheral side of the endless belt to prevent the wheel from slipping off. For example, as shown in FIGS. 2 and 3, when traveling on a sloping ground, the inner wheel 8 and outer wheel 8
Even if the endless belt 5 inclines with respect to 9 and one side of the outer wheel 9 floats up from the endless belt 5, the swing bracket 7R (7F) rotates and the inner wheel that forms a pair with the outer wheel 9 rotates. The wheel 8 engages with the guide projection 51 without floating from the endless belt 5 to prevent wheel removal.

In the crawler traveling device according to the second aspect of the present invention, when the outer wheel rolls between the cored bars and is displaced slightly downward due to the elastic deformation of the endless belt, the inner wheel moves over the cored bar. When the outer wheel rolls and rolls on the cored bar, the inner wheel passes through the sprocket engagement holes between the cored bars and is displaced downward. By the way, the amount of vertical displacement when the inner wheel rolls on the inner peripheral side of the endless belt is larger than that of the outer wheel. On the other hand, when the pivot shaft does not vertically move, the vertical displacement amount of the inner and outer wheels caused by the pivot bracket pivoting is equal to the front-rear horizontal distance between the pivot shaft and each axle. From the difference,
The inner wheel is larger than the outer wheel.

Therefore, the respective vertical displacements that occur when the outer wheel and the inner wheel roll on the inner peripheral side of the endless belt, and the vertical direction of the inner wheel and the outer wheel due to the rotation of the swing bracket. The swing bracket swings about the rotary shaft with the rotary shaft being almost vertically displaced with the displacement being almost in synchronization with each other, so that the vertical movement of the vehicle body is hardly caused, and thus the vibration of the vehicle body is hardly generated. .

Further, in the crawler wheel rolling device according to the third aspect of the present invention, further derailment can be prevented. That is, in the endless belt, when running on a sloping ground, a force that tends to slide down along the slope acts on the front and rear center part of the ground contact part,
Since the force applied to the front and rear ends of the ground contact portion does not act, if the outer wheel attached to the swing bracket is placed at the frontmost or rearward and the inner wheel is placed closer to the center, it is difficult to remove the inner wheel. This prevents the central part of the grounded part of the endless belt from slipping off.

Further, when the swing bracket rotates and the outer rotating wheel is displaced upward and the inner rotating wheel is displaced downward, the endless belt is loosened by the upward displacement of the outer rotating wheel and the inner rotating wheel is displaced downward. Although the endless belt is strained by the displacement, if the vertical displacement amounts of these inner and outer wheels are equal, the endless belt is bent along the outer circumference of the outer wheel, so The degree of loosening due to the displacement is larger, so that the endless belt is loosened and it is easy to derail. However, as described above, since the vertical displacement of the inner wheel is larger than the vertical displacement of the outer wheel, the slack of the endless belt can be suppressed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a crawler traveling device 2 adopting a crawler roller device 1 according to an embodiment of the present invention, in which a driving wheel 3 and a driven wheel 4 each of which is composed of a sprocket wheel are arranged in front and rear. With four grounding wheels 8 and 9,
The endless belt 5 is wound and installed on agricultural machines such as combine harvesters and harvesters. The crawler traveling device 2 has a front side on the right side and a rear side on the left side in FIG.

As the endless belt 5, the one exemplified in FIG. 5 can be adopted. The endless belt 5 is made of an elastic material such as rubber, and has a pair of left and right guide protrusions for preventing wheel removal.
A core metal 52 having 51 is embedded at a predetermined pitch P in the circumferential direction, and a sprocket engagement hole 53 with which the engagement claw of the drive wheel 3 engages is formed in the left and right center between the core metals 52. . Further, a grounding lug 54 is provided on the grounding surface of the endless belt 5 so as to correspond to each core metal 52. In addition, each core metal 52 is a guide protrusion.
It has a wing portion 55 extending from the 51 to the left and right sides.

The grounding wheels 8 and 9 are a pair of left and right guide protrusions.
Roll on the inner circumference side of the endless belt 5 so as to pass only between 51 and 51
The inner wheel 8 and the outer side of the pair of left and right guide protrusions 51, 51.
There are two types: the outer wheel 9 that rolls on the inner circumference side of the endless belt 5 so as to pass through . A pair of front and rear swing brackets 7F and 7R are rotatably connected to the front and rear of the vehicle body 6 of the agricultural work machine or the like about a rotating shaft 7O protruding in the left-right width direction of the vehicle body 6. Has been done. The swing brackets 7F and 7R are substantially triangular in a side view, and the turning shaft 7O is connected to the apex angle portion thereof, and the inner and outer wheels 8 and 9 are attached to the bottom corner portion as a pair in the front and rear respectively. Has been.

The outer wheel 9 is arranged at the frontmost or rearmost of the four grounding wheels 8, 9 and has a pair of inner wheel 8 and outer wheel 9.
The outer wheel 9 is located outward of the inner wheel 8 in the front-rear direction. That is, the outer wheel 9 attached to the front swing bracket 7F is arranged in front of the inner wheel 8 that forms a pair with the outer wheel 9, and the rear swing bracket 7F is also arranged.
The outer wheel 9 attached to the 7R is arranged rearward of the inner wheel 8 paired with the outer wheel 9. And endless belt
5 is slightly bent along the outer circumference of the outer wheel 9 and is linear in the portion where the inner wheel 8 rolls.

The rotating shafts of the swing brackets 7F and 7R are the pair of inner wheels attached to the swing brackets 7F and 7R.
8 and the outer wheel 9 are located halfway in front of and behind the respective axles 8O, 9O, and therefore, a pair of inner wheel 8 and outer wheel 9
9 is because the swing brackets 7F and 7R rotate.
It reciprocally swings up and down. The vertical position of the pivot shaft 7O of the swing brackets 7F and 7R is
Also, it is preferable to bring the outer wheels 9 as close as possible to the vertical positions of the axles 8O, 9O.

The pivot shaft 7O of the swing brackets 7F and 7R
The front-rear position of the outer wheel 9 is as close to the axle 9O side of the outer wheel 9 as possible, and the front-rear horizontal distance L1 between the rotating shaft 7O of the swing brackets 7F, 7R and the inner wheel 8 axle 8O is reduced. , Swing bracket 7F, 7
The distance L2 between the rotary shaft 7O of R and the axle 9O of the outer wheel 9 in the front-rear horizontal direction is larger than L2. Therefore, when there is no vertical displacement of the rotating shaft 7O, the vertical displacement of the inner wheel 8 is smaller than the vertical displacement of the outer wheel 9 when the swing brackets 7F and 7R rotate by a certain angle. It becomes bigger. If the outer wheel 9 is not displaced in the vertical direction, the swing bracket
The vertical displacement amount of the rotating shaft 7O with respect to the constant vertical displacement of the inner wheel 8 when the 7F and 7R rotate by a constant angle is as small as possible.

Further, the axle 8O of the inner wheel 8 and the axle 8 of the outer wheel 9
The front-rear horizontal distance from 9O is L, and the pitch of the core metal 2 is P
, They have the following relationships. L ≒ (n
+0.5) × P [where n is a predetermined integer] Therefore, when the inner wheel 8 rolls between the core bars 2, the outer wheel 9 cores
2 When the outer rolling wheel 9 rolls between the cored bar 2 and the outer rolling wheel 9 rolls over, the inner rolling wheel 8 rolls on the cored bar 2. In this embodiment, n = 3.

According to the present embodiment, the inner wheel 8 rolls between the pair of left and right guide protrusions 51 of the core metal 5 to form the sprocket engaging hole.
Although it is displaced in the vertical direction when passing through 53, the rotation axis 7O of the swing brackets 7F, 7R is as close to the outer wheel 9 side as possible, so Rotating shaft 7O
The vertical displacement of the vehicle body is reduced as much as possible, and
Vibration can be reduced.

In addition, as the endless belt 5 rides on a protrusion while traveling on a slope, as shown in FIGS.
When the endless belt 5 inclines with respect to 8 and the outer rotating wheel 9, one side of the outer rotating wheel 9 floats up from the endless belt 5, but with it,
Since the swinging bracket 7 is rotated and the inner wheel 8 is engaged with the guide protrusion 51 of the cored bar 52 without being lifted from the endless belt 5,
Prevents wheel loss. In addition, in the endless belt 5, the central portion of the ground touches down most along the slope, and the action is less toward the front and back. In this embodiment, the inner wheel 8 is arranged in the center of the front and the rear, and the outer wheel 9 is arranged on the outer side of the front and the rear to effectively prevent the removal of the wheel.

Further, in the present embodiment, as will be described below, the vibration of the vehicle body 6 due to the inner wheel 8 and the outer wheel 9 rolling on the inner peripheral side of the endless belt 5 can be eliminated as much as possible. . Core metal
An outer wheel that rolls on the left and right sides of the pair of left and right guide protrusions 51
9 is supported by the blade portion 55 and the grounding lug 54 of the cored bar 52 when rolling on the cored bar 52, but when rolling between the cored bars 5, the endless belt 5 is elastic due to the weight of the vehicle body 6. A slight vertical displacement occurs due to the deformation.

Further, the inner ring 8 rolling between the pair of left and right guide protrusions 51 of the core metal 5 has the core metal 52 when rolling on the core metal 52.
Although it is supported by the grounding lug 54, it falls into the sprocket engagement hole 53 when rolling between the cored bars 5, causing a vertical displacement larger than the vertical displacement of the outer wheel 9. On the other hand, when the inner wheel 8 rolls on the cored bar 52, the outer wheel 9 rolls between the cored bars 52 and the outer wheel 9 rolls on the cored bar 52.
A pair of inner wheel 8 and outer wheel 9 are arranged so that the inner wheel 8 rolls between the cored bar 52 when rolling up, and the rotation shaft 7O of the swing bracket 7 is arranged. If the vertical displacement does not occur in the vertical direction, the vertical displacement of the inner wheel 8 is larger than the vertical displacement of the outer wheel 9 caused by the swing bracket 7 rotating by a certain angle.

Therefore, a pair of inner and outer wheels 8 and 9 are used.
When the endless belt 5 rolls on the inner peripheral side of the endless belt 5, the swinging bracket 7 to which the inner rotating wheel 8 and the outer rotating wheel 9 are attached swings around the rotating shaft 7O to rotate the rotating shaft 7O. Is hardly displaced in the vertical direction, so that the body 6 hardly vibrates. further,
According to this embodiment, as shown in FIG.
When getting over the vehicle, the inner wheel 8 and the outer wheel 9 swing up and down, and the vehicle body 6 can be held horizontally. At this time, the axle 8O of the inner wheel 8 and the rotating shafts of the swing brackets 7F, 7R
Distance L1 with 7O is the distance between axle 9O of outer wheel 9 and rotating shaft 7O.
Since it is larger than L2, the maximum vertical displacement of the inner wheel 8 can be increased, so that the vehicle body 6 can be held horizontally even when overcoming a larger protrusion.

By the way, the track of the endless belt 5 is bent along the outer circumferences of the outermost wheels 9 arranged at the frontmost and rearmost positions. Since the outer wheel 9 is attached to the swing bracket 7, it is displaced in the vertical direction, but when it is displaced upward, the endless belt 5 is loosened. However, the inner rotating wheel 8 paired with the outer rotating wheel 9 is displaced downward by a larger amount than the upper displacement of the outer rotating wheel 9, thereby tensioning the endless belt 5, so that the endless belt 5 is less likely to loosen. This also makes it difficult to take off.

The present invention is not limited to the above embodiment, but the design can be changed as appropriate. For example, although the number of swing brackets is two in the above embodiment, the number of swing brackets may be one or three or more. When the number of swing brackets is one, it is preferable to provide one or two or more grounding wheels fixed to the vehicle body.

The pair of inner wheel 8 and outer wheel 9 are arranged such that the outer wheel 9 is closer to the center of the grounding portion of the endless belt 5 and the inner wheel 8 is in front of and behind the endless belt 5. You can also Further, although the rocking brackets 7F and 7R have a triangular plate shape, they may have a triangular frame shape and may have any shape.

[0032]

As described above, according to the crawler roller device of the present invention, only the space between the pair of left and right guide protrusions is passed.
And the inner wheel that rolls on the inner side of the endless belt
The inner circumference side of the endless belt so that it passes through the outside of the pair of guide protrusions.
The outer wheel that rolls around the rocker bracket
Is attached to the inner ring and
The inner and outer wheels so that the
It is rotatably connected to the car body in the middle part before and after the wheel.
The inner and outer wheels do not need to be
When the end strip tilts, one side of the outer wheel lifts up
The swing bracket swings with respect to the vehicle body,
The inner wheel does not float from the endless belt
By engaging with the inner protrusion, it is possible to prevent derailment. Further, according to the present invention, the vertical displacement generated when the inner rolling wheel rolls on the inner peripheral side of the endless belt is transmitted to the vehicle body through the swing bracket, but the rotating shaft and the inner rolling wheel are The horizontal distance in the front-rear horizontal direction with respect to the axle of the rotating shaft is larger than the horizontal distance in the front-rear direction between the rotating shaft and the axle of the outer wheel, so that the vertical displacement of the rotating shaft is greater than that of the inner rotating wheel. Can be reduced as much as possible, and thus the vibration of the vehicle body can be reduced as much as possible.

Further, according to the crawler roller device of the present invention as defined in claim 2, the vertical displacement and wobbling that occur when the inner and outer wheels roll on the inner peripheral side of the endless belt, By substantially synchronizing the reciprocal vertical displacements caused by the rotation of the dynamic bracket, the vibration of the vehicle body can be almost eliminated. Further, according to the present invention as set forth in claim 3, it is possible to suppress the slack of the endless belt while adopting the swing bracket to which the pair of inner and outer wheels is attached, and thereby the wheel removal Prevention is achieved.

[Brief description of drawings]

FIG. 1 is an overall side view showing a crawler traveling device that employs a crawler roller device according to an embodiment of the present invention.

FIG. 2 is an enlarged side view showing a main part of the wheel transfer device of the crawler.

FIG. 3 is a cross-sectional view showing an operating state during traveling on a sloping ground.

FIG. 4 is a side view showing an operating state when the vehicle rides on a protrusion.

FIG. 5 is a perspective view of an endless belt.

[Explanation of symbols]

1 Crawler rolling device 5 Endless belt 52 Core metal 6 Car body 7F Swing bracket 7R connected to the front part of the car body Swing bracket 7O connected to the rear part of the car body Swing bracket rotation shaft 8 Inner wheel 8O Inner wheel axle 9 Outer wheel 9O Outer wheel axle P Pitch between cores L Distance between inner wheel axle and outer wheel axle L1 Rotation axis of swing bracket and inner wheel axle Front-rear horizontal distance L2 Front-rear horizontal distance between the rotation axis of the swing bracket and the outer wheel axle

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 55/14 B62D 55/08

Claims (3)

(57) [Claims] 1. A passage between only a pair of left and right guide protrusions (51, 51).
Uchitenwa rolling on the inner circumferential side of the endless belt (5) as excessive to (8)
And pass the outside of the pair of left and right guide protrusions (51, 51).
The outer wheel (9) that rolls on the inner peripheral side of the endless belt (5) is attached to the swing bracket (7F, 7R) as a pair in the front-rear direction. , 7R) is the inner wheel (8) and outer wheel
The inner wheel (8) and the outer wheel (9) are rotatably connected to the vehicle body (6) at a midway portion between the inner wheel (8) and the outer wheel (9) so that the (9) and the (9) swing vertically. Rotating shaft (7O) of dynamic bracket (7F, 7R) and inner wheel
The distance (L1) in the front-rear horizontal direction from the axle (8O) of (8) is the rotation axis (7O) of the swing bracket (7F, 7R) and the axle (9O) of the outer wheel (9). It is larger than the front-rear horizontal direction distance (L2) of the crawler. 2. The inner wheel (8) and the outer wheel (9) attached to the swing bracket (7F, 7R) are the inner wheel (8) in the circumferential direction of the endless belt (5). Core bar (52) provided with a predetermined pitch (P)
When the outer wheel (9) rolls on the cored bar (52) when rolling between the inner ring and the inner ring when the outer wheel (9) rolls between the cored bar (52). 2. The crawler rolling device according to claim 1, wherein the rolling wheel (8) is arranged at a position where it rolls on the cored bar (52). 3. The grounding roller (9) attached to the swing bracket (7F, 7R) is a grounding roller arranged at the frontmost or rearmost of a plurality of grounding wheels connected to the vehicle body (6). The crawler roller device according to claim 1 or 2, which is a wheel.