JP2001239968A - Crawler traveling device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable efficient adjustment of the crawler tension by moving an adjustment wheel and to avoid interference between a swing range restricting means and a tension adjustment mechanism. A tension adjusting wheel, idler driven wheels, and intermediate idler wheels are arranged and supported on a track frame in the front-rear direction, and drive wheels are provided above the idler wheels. And a tension adjusting mechanism 9 that wraps a crawler 7 around these wheels and urges the adjusting wheels 3 in a tension adjusting direction while supporting the adjusting wheels 3 is disposed obliquely downward from the track frame 2 toward the adjusting wheels 3. The frame 2 is swingable about an axis located parallel to and below the axis of the drive wheel 6, and the swing range restricting means 13 for setting the swing range of the track frame 2 is moved from the swing axis. Driven wheel 4
Place on the side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a crawler traveling device capable of adjusting a tension.

[0002]

2. Description of the Related Art For example, as a crawler traveling device, there is a crawler traveling device which is provided in place of a rear tire wheel of a tractor to constitute a semi-crawler tractor. A crawler traveling apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. H11-321729. A track frame is provided with a tension adjusting wheel, a idler driven wheel, and an idler wheel intermediate between them. Are arranged and supported on both ends thereof, and drive wheels are arranged above the idler wheels, crawlers are wound around all these wheels, and the track frame is parallel to the axis of the drive wheels and It is swingable about the axis located below it.

The adjusting wheel is supported by a front end of a tension adjusting means supported by a track frame so as to be movable in a front-rear direction (substantially parallel to a ground contact surface). The tension adjusting means moves the adjusting wheel forward by a spring material. Is energized,
When the crawler is extended, the adjusting wheel is moved forward by the spring pressure of the spring material to adjust the crawler tension. The swing range restricting means for setting the swing range of the track frame is disposed above the tension adjusting means on the adjustment wheel side with respect to the swing axis.

[0004]

The crawler is,
A rubber crawler having a circumferential tensile member embedded therein is used. Although the elongation is smaller than that of an iron crawler, the elongation increases as the crawler is used, so that tension adjustment is required.
In the crawler traveling device of the semi-crawler tractor, since the crawler is wound in a substantially triangular shape in a side view, as in the related art, if a tension adjusting mechanism is disposed in the front-rear direction substantially along the base of the triangle, the adjustment is performed. The amount of tension adjustment is small compared to the travel length of the wheel, and in order to compensate for this, the tension adjustment mechanism must be formed long before and after, resulting in problems such as high cost and increased body weight. Has occurred.

Therefore, the tension of the crawler is efficiently adjusted by moving the adjustment wheel by urging the adjustment wheel away from the crawler center, such as the axis of the drive wheel or the swing axis of the track frame. However, in the case of a small crawler traveling device, if the swing range restricting means exists above the inclined tension adjusting mechanism, there is a risk of interference when the track frame swings. The present invention provides a tension adjusting mechanism in which a tension adjusting mechanism is tilted downward so that the tension of a crawler can be efficiently adjusted by moving an adjusting wheel, and a swing range regulating unit is arranged on a driven wheel side. It is an object of the present invention to provide a crawler traveling device capable of avoiding interference of the crawler.

[0006]

The first concrete means for solving the problem in the present invention is that a tension adjusting wheel 3, an idle wheel 4 and an idle wheel intermediate between them are provided on a track frame 2. 5 are arranged and supported in the front-rear direction.
The drive wheels 6 are arranged above the wheels, and the crawlers 7 are wound around all the wheels, and the tension adjustment mechanism 9 that urges in the tension adjustment direction while supporting the adjustment wheels 3 is directed downward from the track frame 2 toward the adjustment wheels 3. The track frame 2 is tilted so that the track frame 2 is swingable about an axis parallel to and below the axis of the drive wheel 6, and a swing range restricting means 13 for setting a swing range of the track frame 2. Is disposed closer to the driven wheel 4 than the pivot axis.

As a result, the downwardly inclined tension adjusting mechanism 9 elastically presses the adjusting wheel 33 from the center of the substantially triangular crawler 7 in a far direction to efficiently adjust the tension of the crawler 7, and furthermore, the track frame 2 swings. Even if it moves, it does not interfere with the swing range regulating means 13.
The second specific means for solving the problem in the present invention is:
The adjustment wheel 3, the driven wheel 4, and the idler wheel 5 are supported by a cantilevered support shaft projecting outward from the track frame 2.

As a result, the weight of the track frame 2 can be reduced, clogging can be prevented, and cleaning can be facilitated. A third specific means for solving the problem in the present invention is the second specific means.
In addition to the specific means described above, at least the support shaft 5 of the idler wheel 5
A is inclined downward and outward. Thereby, when a load is applied while at least the idler wheel 5 is supported in a cantilever manner, the axis of the support shaft 5A is brought closer to horizontal,
The wheel from the crawler 7 is prevented from being removed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 4 and 5, reference numeral 15 denotes a tractor in which rear tire wheels are replaced with the crawler traveling device 1, and the vehicle body is constituted by an engine 16, a transmission case 17, a front axle frame 18, and the like. Suspended front wheel 19 as a steerable wheel that can be driven
The engine 16 is covered by a hood 20. The tractor 15 is equipped with a cabin 21 and includes a control unit 22 and a driver's seat 2.
3 and a rear working machine 25 such as a rotary cultivator is towed at the rear of the vehicle body via a hydraulic device and a three-point link mechanism 24. A lops may be mounted instead of the cabin 21.

[0010] In FIGS.
Are mounted on a track frame 2 formed of a square material, a plate material, a pipe material, etc., with a tension adjusting wheel 3 and an idler driven wheel 4.
And the idler wheel 5 between them are arranged and supported in the front-rear direction in a cantilevered support state, a drive wheel 6 is arranged above the idler wheel 5, and a crawler 7 is wound around all these wheels. The track frame 2 is configured to be swingable about an axis located parallel to and below the axis of the drive wheels 6. The adjusting wheel 3 is rotatably supported by a free end of a downwardly inclined tension adjusting mechanism 9 provided on the upper surface of the front end of the track frame 2 via a support shaft 3A.

The tension adjusting mechanism 9 is provided on the upper surface of the front end of the track frame 2 with a support 8 having a U-shaped cross section (or a flat plate).
Is provided, a shaft support 10 that cantileverly supports the support shaft 3A of the adjustment wheel 3 is slidably supported by the support 8 in the longitudinal direction, and a push screw 11 is attached to the female screw portion 8a at the rear of the support 8. The tension spring 12 is disposed between the push screw 11 and the shaft support 10. The tension adjustment mechanism 9 is inclined forward and downward from the front upper surface of the track frame 2 toward the support shaft 3A of the adjustment wheel 3,
The adjusting wheel 3 can be moved in the distance direction from the center side of the crawler 7 such as the axis of the swing shaft 36 and the tension spring 1
At 2, it is suppressed in the far direction.

The driven wheel 4 is rotatably supported at the rear end of the track frame 2 via a support shaft 4A.
The support shaft 4A also protrudes outward from the outer surface of the track frame 2 and is cantilevered. The three idler wheels 5 are disposed on the outer surface of the track frame 2 via a cantilevered support shaft 5A, and three idler wheels are illustrated. The idler wheel 5 may be one or two or more in number, and has a smaller diameter than the adjusting wheel 3 and the driven wheel 4.

The support shaft 5A of the idler wheel 5 is inclined very slightly outward (shown by an inclination angle C in FIG. 3) with respect to the horizontal direction (parallel to the rear axle 33) B.
The horizontal direction B is set when a load due to the weight of the body is applied. Since the support shaft 3A of the adjustment wheel 3 and the support shaft 4A of the driven wheel 4 are also cantilevered, the support shafts 3A and 4A may be inclined outward and downward similarly to the support shaft 5A. The drive wheel 6 is a sprocket (a drive transmission having teeth on the outer periphery of a disk) mounted on the outer end surface of the rear axle 33. The rear axle 33 is supported by a rear axle case 34 protruding left and right from the rear of the transmission case 17 and protrudes outward from the rear axle case 34. In the case of a wheel-type tractor, a tire is used instead of the drive wheel 6. Wheels are mounted.

The pitch circle diameter of the drive wheels 6 is set to be approximately half of the outer circumference diameter of the tire wheels, and therefore, the power transmission system to the front wheels 19 has substantially the same peripheral speed as the drive wheels 6. A speed reducer for performing the operation is incorporated. In addition,
A transmission that increases the peripheral speed of the front wheels 19 than the peripheral speed of the drive wheels 6 may be provided. Since the drive wheel 6 is disposed above the idler wheel 5, the adjustment wheel 3 and the driven wheel 4 have a triangular arrangement, and the drive wheel 6 forms an upper vertex of the triangle.
The adjustment wheel 3 and the driven wheel 4 each form a lower vertex. Crawler (elastic crawler) wound around all these wheels
7 is substantially triangular (diaper shape) in side view,
The idler wheel 5 is located at the base of the substantially triangle.

The crawler 7 may be an iron crawler,
Here, a rubber crawler having a tensile member in the circumferential direction embedded therein is used, and engaging holes for engaging teeth (engaging protrusions) of the driving wheel 6 are formed at equal intervals in the circumferential direction at the center in the width direction. The outer circumferential contact surface has a pattern of lugs such as a horizontal character or a letter V,
Derailing prevention projections are formed on the inner peripheral surface, respectively. The crawler 7 may have a core bar, which is a tensile member in the width direction, embedded at equal intervals in the circumferential direction. A swing support 35 formed of a plate or the like from the main body is erected on the track frame 2, and an upper portion of the swing support 35 is supported by a swing shaft 36 supported by a reinforcing frame 37. I have.

The reinforcing frame 37 is provided on the left and right rear axle cases 3.
4, a connection member 39 fixed to the lower surface of the transmission case 17, and a connection member 39 fixed to the lower surface of the transmission case 17.
And a frame member 44 connecting the mounting frame 38 and the mounting frame 38. Attachment frame 3 on both left and right sides of the reinforcing frame 37
A swing shaft 36 is fixed to 8, and a cylindrical body 42 provided at the upper end of the swing support 35 is fitted to the swing shaft 36, and the cylindrical body 42 is an end portion of the swing shaft 36. The stopper plate 43 prevents it from coming off. The pivot axis of the track shaft 2 is parallel to and directly below the axis of the rear axle 33, and serves as the pivot center of the track frame 2 in the front-rear direction.

On the rear side (side of the driven wheel 4) of the swing support member 35, a plate member erected on the track frame 2
0 is provided, and a stopper 41 is provided on a plate material protruding rearward from the mounting plate 38 in opposition thereto. The stopper 41 is formed by fitting a roller with a pin. The stopper 41 comes into contact with the up-and-down regulating body 40 when the track frame 2 swings largely back and forth, so that the swing amount of the swing support body 35 in the front-rear direction is increased. Is regulated. It is preferable that each of the upper and lower regulating members 40 is capable of adjusting the vertical position.

The swing range regulating means 13 is constituted by the upper and lower regulating body 40 and the stopper 41. The swing range regulating means 13 can be arranged on the adjustment wheel 3 side of the front side of the swing shaft 36. However, since the rear end of the push screw 11 is extended closer to the swing shaft 36 than in the case where the tension adjusting mechanism 9 is horizontally arranged in the front-rear direction, the swing is performed in order to avoid interference with the swing shaft 36. It is arranged on the driven wheel 4 side on the rear side of the driving shaft 36. Further, by disposing the swing range regulating means 13 on the driven wheel 4 side, the front and rear swing range of the track frame 2 can be widened, and the adjustment of the tension adjusting mechanism 9 becomes easy.

A crawler traveling device 1 having a substantially triangular shape in side view.
The front part is formed slightly longer than the rear part from the axis of the swinging shaft 36, so that when the rear working machine 25 is mounted on the tractor 15, the running stability and the traction force are increased. ing. However, the horizontal distance from the axis of the swing shaft 36 to the adjustment wheel 3 may be substantially equal to that of the driven wheel 4, or may be longer than shown. As shown in FIGS. 1 and 4, the adjusting wheel 3 is positioned higher by a dimension H than a horizontal tangent line (the inner peripheral surface of the crawler 7) L on the ground side of the idler wheel 5, and is adjusted by tension adjustment. Even if the wheel 3 moves far from the center of the crawler 7, the adjustment wheel 3 always exists above the tangent L.

As a result, even if the adjusting wheel 3 rides on a protrusion on the ground or collides with a stone, the adjusting wheel 3 retreats upward and rearward from the horizontal pin 30. Even if an impact is applied, the adjusting wheel 3 is moved upward. It becomes possible to release and provide a buffering action. That is, the tension adjusting mechanism 9 also serves as a buffer mechanism. Since the tension adjusting mechanism 9 is inclined forward and downward,
From the viewpoint of the entire crawler traveling device 1, the movement is substantially in the near-far direction from the axis of the drive wheel 6 (the rear axle 33), the swing axis of the track frame 2 (the swing axis 36), or the vicinity thereof.

That is, the movement is not in the front-back direction along the base of the triangle but in the near-far direction (radial direction) from the center of the substantially triangular crawler 7, and the elastic biasing force is in the far direction (radial direction, radial direction). ). Therefore, the moving distance for extending the crawler 7 for adjusting the tension of the adjusting wheel 3 is as follows.
This is more than when the adjustment wheel 3 is moved forward in the horizontal direction and the lower front vertex of the substantially triangular crawler 7 is moved forward, so that the crawler 7 can be sufficiently extended with a small amount of movement so as to give an appropriate tension. it can.

When the amount of extension of the crawler 7 is large and the elastic pressure of the tension spring 12 is small, the push screw 11 is advanced to adjust so as to give an appropriate elastic pressure.
Note that the present invention is not limited to the above embodiment, and can be variously modified. For example, the stopper 41
May be provided on the swing support 35, or the adjustment wheel 3 may be disposed on the rear side of the track frame 2 and the driven wheel 4 may be disposed on the front side.

[0023]

According to the present invention described in detail above, the adjustment wheel 3
Since the tension adjusting mechanism 9 inclined downward to the side adjusts the tension by moving the adjusting wheel 3 away from the center of the substantially triangular crawler 7, the tension adjustment of the crawler 7 can be performed efficiently, and the swinging motion Since the range restricting means 13 is disposed on the driven wheel 4 side, it is possible to prevent the tension adjusting mechanism 9 from interfering with the rocking range restricting means 13 even when the track frame 2 rocks.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a sectional plan view of the same.

FIG. 3 is a sectional rear view of the same part.

FIG. 4 is an overall side view of the semi-crawler tractor.

FIG. 5 is a sectional rear view of the same part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crawler running device 2 Track frame 3 Adjusting wheel 3A Support shaft 4 Follower wheel 5 Idling wheel 6 Drive wheel 7 Crawler 9 Tension adjusting mechanism 13 Swing range regulating means 33 Rear axle 35 Swing support 36 Swing shaft

Claims (3)

[Claims] An adjusting wheel for tension adjustment, an idler idler wheel, and an idler wheel intermediate between them are arranged and supported on a track frame in the front-rear direction, and a drive wheel is arranged above the idler wheel;
A tension adjusting mechanism that wraps a crawler around all these wheels and urges in the tension adjusting direction while supporting the adjusting wheels is disposed obliquely downward from the track frame to the adjusting wheels, and the track frame is parallel to the axis of the driving wheels. And a swing range restricting means for setting the swing range of the track frame is disposed closer to the driven wheel than the swing shaft center. Crawler traveling device. 2. The crawler traveling device according to claim 1, wherein the adjusting wheel, the driven wheel, and the idler wheel are supported by a cantilevered support shaft projecting outward from a track frame. 3. The crawler traveling device according to claim 2, wherein at least a support shaft of the idler wheel is inclined outward and downward.