JP2006096109A - Crawler travel device - Google Patents

Abstract

A yoke member that supports a front driven wheel is rotatable about its axis so that wear of the driven wheel and a crawler belt can be reduced as much as possible.
A crawler traveling device wraps a crawler belt 7 around front and rear driven wheels 2 and 3 and a roller 4 provided on a track frame 6 and a drive wheel 5 disposed above them. The tension adjusting device 14 that adjusts the tension is fixed to the track frame 6 and has a cylindrical cylindrical hole, and the yoke receiving body 20 is inserted into the yoke receiving body 20 so as to be freely retractable and supports the front driven wheels 2 and 3. A cylindrical yoke member 21 and a biasing means 29 for biasing the yoke member 21 forward. The yoke member 21 is moved to the yoke 4 in order to follow the lateral movement of the crawler belt 7 with respect to the rollers 4. The shaft 20 is rotatable about the axis with respect to the receiving body 20.
[Selection] Figure 2

Description

  The present invention relates to a crawler traveling device used in a work vehicle such as a tractor.

Conventionally, as this type of crawler traveling device, a track frame is supported on a traveling machine body so as to be swingable via a swing shaft, and front and rear driven wheels and wheels are provided on the track frame, and above the swing shaft. Tension adjustment that arranges drive wheels to which power is transmitted from the axle of the traveling machine body, wraps the crawler belt around the drive wheels, front and rear driven wheels, and wheels so that the crawler belt can circulate in a circumferential direction and adjusts the tension of the crawler belt. There is one in which a device is provided between a track frame and the front driven wheel (see Patent Document 1).
In this crawler traveling device, a square cylindrical support member that supports a front driven wheel is fitted into a square cylindrical frame fixed to a track frame, and the support member is in a state of preventing rotation about its axis. The support member is urged forward by the urging means in the frame to apply tension to the crawler belt. Further, on the inner peripheral surface of the crawler belt, engagement protrusions (guide protrusions) are provided for preventing the wheels from being removed such as driving wheels, front and rear driven wheels, and rolling wheels. Further, a so-called matagi wheel is adopted for the wheel, and the guide protrusion is engaged over the wheel.
Japanese Patent Laid-Open No. 2004-148872 (FIG. 3)

Normally, in a crawler traveling device, there is a dimensional difference between the guide protrusion of the crawler belt and the inner side surface of the wheel, so that a gap is formed between the wheel and the guide protrusion. The crawler belt may shift in the left-right direction (width direction) .If the crawler belt is displaced in the width direction in this way, the guide protrusion of the crawler belt hits the front driven wheel, resulting in excessive friction, which causes the guide protrusion to move. Wear and heat will be generated.
The present invention has been made in view of the above circumstances, and by making the yoke member supporting the front driven wheel freely rotatable around its axis, wear and heat generation of the driven wheel and the crawler belt are possible. An object of the present invention is to provide a crawler traveling device that can be reduced in number.

In order to achieve the above object, the present invention takes the following technical means.
First, the crawler traveling device wraps the crawler belt 7 around the front and rear driven wheels 2 and 3 and the rolling wheel 4 provided on the track frame 6 and the drive wheel 5 disposed above them. The tension adjusting device 14 that adjusts the tension is fixed to the track frame 6 and has a cylindrical cylindrical hole, and the yoke receiving body 20 is inserted into the yoke receiving body 20 so as to be freely retractable and supports the front driven wheels 2 and 3. A cylindrical yoke member 21 and a biasing means 29 for biasing the yoke member 21 forward. The yoke member 21 is moved to the yoke 4 in order to follow the lateral movement of the crawler belt 7 with respect to the rollers 4. It is characterized in that it can rotate around the axis with respect to the receiving body 20.

According to this, since the cylindrical yoke member 21 is rotatable about the axis, it can follow the displacement movement of the crawler belt 7 in the left-right direction, thereby preventing wear due to friction between the front driven wheel 2 and the crawler belt 7. It can be reduced as much as possible.
Secondly, a cylindrical bush 27 is provided between the yoke receiver 20 and the yoke member 21.
According to this, wear due to friction between the yoke receiver 20 and the yoke member 21 can be prevented.

  According to the present invention, wear of the driven wheel and the crawler belt can be reduced as much as possible by making the yoke member supporting the front driven wheel rotatable about its axis.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The crawler traveling device 1 according to the present invention is attached to a rear axle instead of a rear wheel of a work vehicle such as a tractor.
As shown in FIG. 2, the crawler traveling device 1 includes a pair of front and rear driven wheels 2 and 3, a plurality (four in this embodiment) of wheels 4, and these driven wheels 2 and 3 and wheels 4. A drive wheel 5 disposed above the track wheel 6, a track frame 6 to which the driven wheels 2, 3 and the wheel 4 are attached, and a crawler wound around the drive wheel 5, the driven wheels 2, 3 and the wheel 4. The belt 7 and the support body 8 that supports the track frame 6 are provided, and the crawler belt 7 is circulated in the circumferential direction by rotating the drive wheels 5 around the left and right axial centers. It is configured to run.

The track frame 6 is mainly composed of a rectangular cylindrical cylinder and is arranged along the front-rear direction. The front and rear driven wheels 2 and 3 of the track frame 6 are attached. The front and rear driven wheels 2 and 3 below the track frame 6 are disposed in the front-rear direction and attached to the track frame 6.
A rocking shaft 9 is supported on the support body 8 so as to be rotatable around a horizontal axis, and a track frame 6 is attached to the rocking shaft 9. Along with the driving wheels 2 and 3 and the wheel 4, the support 8 is supported (suspended) so as to be swingable up and down around the axis of the swing shaft 9.

The crawler belt 7 has an endless belt-like body portion, and rubber drive projections (guide projections) 11 are arranged at appropriate intervals in the circumferential direction on the inner peripheral side in the lateral direction center side. It is provided over the direction.
The drive protrusion 11 is engaged with the drive wheel 5 in the circumferential direction to receive the drive force from the drive wheel 5, and is engaged with the wheel 4, the drive wheel 5 and the driven wheels 2, 3 in the left-right direction and detached. It has a function of preventing a ring (preventing the crawler belt 7 from coming off). A lug 12 is provided on the outer peripheral side of the crawler belt 7. Note that the wheel 4 employs a so-called matagi wheel, and the drive protrusion 11 is engaged across the left and right.

The front driven wheel 2 (hereinafter referred to as the front driven wheel 2) is supported by a support bracket 15 provided in a tension adjusting device 14 for adjusting the tension of the crawler belt 7 so as to be rotatable about a left and right axial center. The adjusting device 14 is fixed to the front portion of the track frame 6.
Further, the rear driven wheel 3 (hereinafter referred to as the rear driven wheel 3) is supported by a support bracket 17 fixed to the rear end side of the track frame 6 so as to be rotatable about a horizontal axis.
The front and rear driven wheels 2 and 3 are supported by the support brackets 15 and 17 so as to be rotatable about the right axis, and are positioned so as to sandwich (straddle) the drive protrusion 11 so as to cover the inner peripheral surface of the crawler belt 7. A pair of left and right wheels 18 that roll is provided, thereby preventing the crawler belt 7 from coming off.

2, 3, and 4, the tension adjusting device 14 is a cylindrical yoke receiving body 20 fixed to the track frame 6 by bolting, welding, or the like, and the yoke receiving body 20 can be moved back and forth from the front side. A cylindrical yoke member 21 that is inserted into the support wheel 2 and supports the front driven wheel 2, and a yoke receiving body 20 and a tension mechanism 22 housed in the yoke member 21.
The yoke receiver 20 has a cylindrical hole (circular hole) 20a on the inner side, its front end is open, its rear end opening is closed by the rear wall 24, and the yoke member 21 has a rear end. The front end opening is closed by the front wall 25 in the form of an opening. The outer shape of the yoke receiver 20 has a cylindrical shape or a quadrangular prism shape, and is fixed to the front upper surface side of the track frame 6.

An attachment plate 26 is fixed to the front end side of the yoke member 21, and a support bracket 15 that supports the front driven wheel 2 is attached and fixed to the attachment plate 26.
Since the cylindrical yoke member 21 is inserted into the cylindrical hole 20a of the cylindrical yoke receiving body 20, the cylindrical yoke member 21 is rotatable about its axis.
A gap is formed between the wheel 4 and the driving protrusion 11. For example, when the work vehicle is turning, the grounding portion of the crawler belt 7 is left and right with respect to the wheel 4 as shown in FIG. There is a case where it moves in the direction A (band width direction of the belt-like crawler belt). In this case, the crawler belt 7 is inclined obliquely as indicated by the two-dot chain line in FIG. 1, whereby the driving protrusion 11 of the crawler belt 7 hits the front driven wheel 2. At this time, the portion of the crawler belt 7 between the driving wheel 5 and the front driven wheel 2 is inclined obliquely in front view and engaged with the front driven wheel 2 in accordance with the movement of the ground contact portion.

As a result, the driving protrusion 11 of the crawler belt 7 engaged with the front driven wheel 2 abuts on the side surface 18a of the ring body 18 of the front driven wheel 2, but the yoke member 21 is rotatable as described above. Therefore, the front driven wheel 2 rotates in the left-right direction A following the inclination of the crawler belt 7 as shown in FIG. Therefore, the pressure when the drive protrusion 11 contacts the front driven wheel 2 is reduced, and wear and heat generation of the drive protrusion 11 can be reduced as much as possible.
3 and 4, a cylindrical bush 27 for supporting the yoke member 21 is provided between the yoke receiver 20 and the yoke member 21, and the yoke member 21 is rotated as described above. Even in this case, the yoke member 21 and the yoke receiver 20 are prevented from being rubbed and worn. In addition, the cylindrical hole 20a of the yoke receiver 20 is formed so that the diameter of the front portion is larger than the diameter of the rear portion, and thereby the fitting portion 20b in which the bush 27 is fitted to the front portion of the yoke receiver 20. Is formed. The bush 27 is fitted into the fitting portion 20b and is positioned by abutting against a step portion 20c formed on the rear side of the fitting portion.

The tension mechanism 22 includes a grease cylinder 28, a compression coil spring (biasing member) 77, and a retainer 30 interposed between the grease cylinder 28 and the coil spring 29.
The grease cylinder 28 is arranged on the center side of the yoke member 21 and along the axial direction of the yoke member 21, and the cylinder body 32 of the grease cylinder 28 is fixed to the rear surface of the front wall 74 of the yoke member 21 by welding or the like. Has been.
The piston rod 33 of the grease cylinder 28 is inserted into the cylinder body 32 from the rear end opening.

A grease nipple 34 is provided on the front upper surface side of the cylinder body 32, and an insertion hole for inserting a grease gun for injecting grease into the cylinder body 32 from the grease nipple 34 in the front portion of the upper wall of the yoke member 21. 35 is formed, and the insertion hole 35 is normally closed by a lid plate 36.
The coil spring 29 is a biasing means that biases the yoke member 21 forward, and one end side (rear end side) is in contact with the rear wall 24 of the yoke receiver 20 and the other end side (front end side) is It is in contact with a spring receiver 38 of the retainer 30.

The retainer 30 is fixed to the front end side of the rod body 39 and is in contact with the biston rod 33 of the grease cylinder 28 and is inserted into the coil spring 29 (to which the coil spring 29 is fitted). A contact member 40 made of a plate material and the like, and a spring that is disposed opposite to and spaced from the rear side of the contact member 40 and is fixed to the rod body 39 and contacts the other end of the coil spring 29 Mainly composed of a receiver 38.
In the tension adjusting device 14, tension is applied to the crawler belt 7 through the retainer 30, the grease cylinder 28, and the front driven wheel 2 by the biasing force of the coil spring 29, and grease is injected into the cylinder body 32. By doing so, the tension of the crawler belt 7 can be adjusted.

Further, a peep hole 41 is formed in the side wall on the outer side in the left-right direction of the yoke receiver 20, and the peep hole 41 has a tension force of the crawler belt 7 (the urging force of the coil spring 29) as shown in FIG. An appropriate range display portion including a groove indicating the adjustment range is formed.
Further, a notch 43 is formed on the side wall on the outer side in the left-right direction of the yoke member 21 from the rear end side to the front side so that the spring receiver 38 of the retainer 30 can be seen from the peep hole 41.
By visually observing the position of the spring receiver 38 of the retainer 30 from the peep hole 41, it is possible to check whether the tension of the crawler belt 7 is an appropriate value. The peep hole 41 and the spring receiver 38 of the retainer 30 can be checked. A check means for checking the tension of the crawler belt 7 is configured by an appropriate range display portion or the like.

The crawler traveling device 1 is provided with a guide device 44 that guides the crawler belt 7. The guide device 44 is for suppressing the crawler belt 7 from vibrating (flapping) in the thickness direction when traveling at a relatively high speed.
As shown in FIG. 2, the guide device 44 includes a guide wheel 45 that contacts the inner peripheral side of the crawler belt 7, a support arm 46 that supports the guide wheel 45 in a swingable manner, and the support arm 46 and the track. An urging means 47 is provided over the support 8 that supports the frame 6 and urges the guide wheel 45 toward the crawler belt 7. It can handle fluttering.

Further, the crawler traveling device 1 is provided with a scraper 48 that removes mud adhering to the front and rear driven wheels 2, 3 and the wheels 4.
The scraper 45 is provided on each of the front and rear driven wheels 2, 3 and the plurality of rolling wheels 4. As shown in FIG. 5, the scraper 45 has a rectangular shape (rectangular shape) from one surface or both surfaces of a rectangular substrate 49. The plate material 50 is provided so as to protrude.
The plate member 50 is arranged so that the lower end portion thereof is close to each wheel, and mud adhering to each wheel hits the lower end portion and is scraped off.

In the case of the scraper 48 for the wheel 4, the substrate 49 is fixed to the side wall of the track frame 6 by a fixing means such as a bolt through a hole 49 a formed through the substrate 49.
On the other hand, in the case of the scraper 48 for the front and rear driven wheels 2 and 3, the substrate 49 is supported by the support member 51, and the scraper 48 for the front driven wheel 2 fixes the support member 51 to the yoke member 21, and In the case of the scraper 48 for the driven wheel 3, the support member 51 is fixed to the support bracket 17 of the rear driven wheel 3.
FIG. 6 shows a modified example of the scraper 48. The scraper 48 is provided on each of the front and rear driven wheels 2, 3 and the plurality of rolling wheels 4, and one of the rectangular (rectangular) substrates 49 is provided. Two plate members 50 are provided so as to protrude on the surface, and the two plate members 50 and the substrate 49 are formed in a triangular shape.

  The present invention is not limited to the one in which the driving protrusion 11 of the crawler belt 7 is integrally formed of rubber, and for example, is applicable to a structure in which the driving protrusion is formed by embedding a cored bar having a protrusion in the crawler belt 7. it can. Further, the wheel 4 is other than the Matagi wheel, for example, a core metal is embedded in the crawler belt 7 to make the drive protrusion 11 bifurcated (paired), and the wheel 4 is engaged between the drive protrusions 11. It can also be applied to the matching type.

It is a front view of the crawler traveling device concerning the present invention. It is a side view of the crawler traveling device. It is sectional drawing which shows a tension adjustment apparatus. It is XX arrow directional cross-sectional view of FIG. It is a perspective view of a scraper. It is a perspective view of a scraper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler traveling device 2 Front driven wheel 3 Rear driven wheel 4 Rolling wheel 5 Drive wheel 6 Track frame 7 Crawler belt 14 Tension adjusting device 20 Yoke receiving body 20a Cylindrical hole 21 Yoke member 27 Bush

Claims (2)

  The crawler belt (7) is wound around the front and rear driven wheels (2, 3) and the rolling wheels (4) provided on the track frame (6) and the driving wheel (5) disposed above them. The tension adjusting device (14) for adjusting the tension of 7) includes a yoke receiver (20) fixed to the track frame (6) and having a cylindrical hole (20a), and the yoke receiver (20). A cylindrical yoke member (21) that is freely inserted and supports the front driven wheels (2, 3) at the tip thereof, and a biasing means (29) that biases the yoke member (21) forward are provided. The yoke member (21) is rotatable about the axis with respect to the yoke receiver (20) in order to follow the lateral movement of the crawler belt (7) with respect to the roller (4). A crawler traveling device characterized by the above.   The crawler traveling device according to claim 1, wherein a cylindrical bush (27) is provided between the yoke receiver (20) and the yoke member (21).

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