JP2001239963A - Crawler traveling device and semicrawler type tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent accumulation of mud in a truck frame, and to improve maintenability in a crawler traveling device. SOLUTION: In this crawler traveling device for supporting the left and right both sides of plural rolling wheels 29 arranged in the inner peripheral lower part of a crawler traveling body 16 by the truck frame 13, a hole 40 is formed in a side wall 13B of the truck frame 13 for removing a foreign matter such as mud entering the truck frame 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device and a semi-crawler type tractor.

[0002]

2. Description of the Related Art Tractors, particularly agricultural tractors, can be broadly classified into wheel-type (wheel-type) and crawler-type (crawler-type) when classified according to traveling devices. Of these, crawler-type tractors can be subdivided into full-crawler types and semi-crawler types.The full-crawler type has a large contact area and a small contact pressure compared to wheel-type tractors, so it can travel on uneven terrain such as soft ground. Suitable for heavy work requiring traction force due to its large weight and large adhesion coefficient.For example, it is used exclusively for land improvement and land improvement by subsoilers etc. to secure drainage in wetlands where it is impossible to work with wheel-type tractors. It is a so-called season-limited special machine.

On the other hand, a semi-crawler type tractor is
The mainstream is to replace the rear wheel of a wheel-type tractor with a crawler traveling body instead of using it as a dedicated machine.Since the ground contact area is larger than that of a wheel-type tractor, it is also used for work on flexible ground such as wet fields. It is suitable and has the advantage of being more mobile than the full crawler type.

[0004]

As described above, since the crawler-type tractor is mainly used on a soft ground such as a wetland, mud or the like climbs on the lower inner peripheral surface of the crawler traveling body by traveling. The mud and the like easily adhere to and get caught in the rolling wheels, so that mud and the like accumulate in the track frame, particularly between a plurality of rolling wheels, and mud clogging may occur. When such mud clogging or the like occurs, it not only hinders traveling but also may cause derailing, so that mud in the truck frame is discharged during maintenance such as cleaning. In the case of a structure that supports the left and right sides of the vehicle, the left and right sides of the rolling wheel are blocked by the side walls of the track frame, so that it is difficult to discharge mud and the like. Due to its compact size, it is more difficult to discharge mud.In some cases, cleaning is performed through troublesome work such as removing the crawler traveling device from the tractor and disassembling the rolling wheels from the truck frame. Sometimes had to be done.

The present invention has been made in view of the above circumstances, and has as its object to provide a crawler traveling device and a semi-crawler type tractor for preventing accumulation of foreign matter in a track frame and improving maintainability. I do.

[0006]

The present invention employs the following technical means to achieve the above object. That is,
The present invention relates to a crawler traveling device that supports left and right sides of a plurality of rolling wheels disposed at an inner peripheral lower portion of a crawler traveling body on a track frame. Holes for removing foreign substances such as Here, the hole for removing foreign matter is a hole for directly passing foreign matter that has entered the track frame and discharging the foreign matter to the outside during traveling of the crawler traveling device or during maintenance or the like. Sometimes, it refers to a hole used to insert a foreign matter removing device or the like into the track frame.

[0007] With such a configuration, it is possible to easily remove foreign matter in the track frame through the holes during traveling or during maintenance, thereby preventing accumulation and improving maintainability. Also, the present invention
The hole is formed corresponding to between the plurality of rolling wheels. According to such a configuration, foreign matters accumulated between the rolling wheels can be suitably removed (discharged) through the holes.

Further, the present invention is characterized in that the hole overlaps the outer peripheral portion of the rolling wheel in a side view. With such a configuration, mud and the like adhering to the rolling wheels can be suitably discharged from the holes, and can be easily removed with a tool or the like. The semi-crawler type tractor according to the present invention is characterized in that a wheel-shaped front wheel is provided at a front portion of a tractor vehicle body, and a crawler traveling device having the above-described configuration is provided at a rear portion as a rear wheel.

Thus, even with a relatively compact crawler traveling device (semi-crawler), it is possible to easily remove mud and the like that have invaded the track frame, thereby improving maintainability. Become.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a pair of left and right front wheels 2,
FIG. 1 shows a side view of a tractor 1 that constitutes a full-drive traveling device (which drives a front wheel 2 and a semi-crawler 3) with a pair of left and right rear wheels (semi-crawler; crawler traveling device according to the present invention) 3; ing. In the present specification, the front-back direction refers to the traveling direction of the tractor 1 (crawler traveling device 3), and the left-right direction refers to a lateral direction orthogonal to the front-rear direction (a rotation axis direction of a rolling wheel 29 described later). Shall say.

The tractor 1 is configured to be capable of vertically mounting a working machine 5 via a link mounting means provided on the rear side thereof, for example, a three-point link mechanism 4. The figure shows an example in which a rotary tilling device is mounted as the working machine 5.
The tractor 1 has an engine 6 covered with a hood 7, and has a steering handle 8 A and a seat 8 B on the front and rear to form a driving control device. The driving control device is covered with a cabin 9. Instead of the cabin 9, a safety frame (lops) may be provided, or a tractor without these may be used.

The left and right front wheels 2 are driving wheels,
Steering wheels that can be steered left and right by operating the steering handle 8A, and can be driven in the forward and reverse directions by a power from the front wheel propulsion shaft device 10 via a front wheel differential and an increase / decrease device, not shown. It is. The left and right semi-crawlers 3 form a side view of a rotary drive body 12 attached to a rear axle 11 of the tractor 1 and front and rear rotary followers 14 and 15 mounted on a track frame 13 therebelow. An endless belt-shaped crawler traveling body 16 is wound around the rotary driving body 12 and the front-rear rotating followers 14 and 15 in a triangular arrangement, thereby forming a substantially tapered shape in a side view.

The crawler traveling body 16 is formed of an elastic material such as rubber, and has a core metal buried at a predetermined interval in the longitudinal direction of the band, and has a horizontal one-letter shape and an eight-sided shape on the outer peripheral surface (ground contact surface side). The lugs 16A (see FIG. 1) having a character shape or the like are bulged at intervals in the longitudinal direction of the band, so that a large traction force can be secured. Further, as shown in FIG.
Ground contact length L based on a vertical line VV passing through the axis of
1, L2 are different, the front contact length L1 is large, and the rear contact length L2 is small, and the semi-crawler 3 is prevented from protruding greatly backward from the tractor body 1A. The work machine (rotary, plow, subsoiler, broadcaster) 5 is easily mounted via the three-point link means 4 provided at the rear of the vehicle body 1A, and the work machine 5 is lifted while securing the front-rear weight balance. To ensure good turning performance (small turning performance), and to prevent skidding on slopes with sufficient ground contact length when working with the work machine 5 lowered, and secure large traction force. I have.

The front left and right front wheels 2, which are both steering wheels and driving wheels, are lugs 2A arranged in a tread portion such as a horizontal one-letter shape or a V-shape, in particular, pneumatic rubber tires having high lugs. The driving force with the left and right semi-crawlers 3, that is, the balance of the front and rear driving force, is secured. Here, the floating of the front of the tractor is prevented and the driving force of the front wheel 2 is sufficiently increased. It has been put to good use. Referring to FIG. 1 or FIG. 2, details of the semi-crawler 3 are illustrated. The rotary driving body 12 in the left and right semi-crawlers 3 can adopt a drum type, a roller type, a sprocket type, or the like. The rear axle 11 is attached to the shaft end flange 11A of the rear axle 11 in such a manner as to be aligned with the axis of the rear axle 11 by a plurality of bolts or the like.

The left and right rear axles 11 are connected to the tractor body 1.
A is rotationally driven by a traveling system transmission device built in A. Specifically, it is rotationally driven under a shift via a rear differential device and its output shaft, a final reduction device, and the like, and a left and right independent brake device. Can be braked. The left and right rear axles 11 are rotatably supported by bearings, not shown, which are inserted into rear axle housings 17 protruding outward from the left and right side surfaces of the tractor body 1A. The track frames 13 of the left and right semi-crawlers 3 are mounted so as to be vertically swingable about a swing support shaft 18.

That is, the support 1 is provided on the lower surface of the rear axle housing 17.
9 are attached by bolt fasteners 20 disposed before and after the box 17, bolt fasteners 21 from the lower surface of the box 17, and bolt fasteners 22 from the rear surface.
9 is a bearing portion 23 of the swing support shaft 18 below the rear axle housing 17.
The bearing portion 23 includes left and right support pieces 23A and 23A.
3B, a cylindrical body 23C is fixed between the cylindrical bodies 23B.
The swing support shaft 18 is inserted through C and positioned by the stopper 23D. The cylindrical member 23C is integrally formed with a mounting piece 23E for the lower link check chain of the three-point link mechanism 4.

The track frame 13 of the semi-crawler 3
As shown in FIG. 2, the track frame 13 is formed in an inverted groove shape (gate shape) having a downwardly open cross section. And the rotary driving body 12 is located between the right and left tension adjusting means 24 so as to be compact in the up-down direction. A window 13A into which the part enters is formed. A mounting plate 25 of the swing support shaft 18 is fixed to the inside of the track frame 13, and a saddle-shaped front and rear reinforcing plate 26 is fixed to the front and rear of the mount plate 25 and the swing support shaft 18 in a side view. , The rocking support shaft 18 is firmly supported, and the rocking support shaft 18 thus supported is inserted from the outside of the bearing 23 to the inside thereof, and is inserted at the insertion end by the stopper 23D. At this time, an annular collar 27 having a dust seal is interposed between the mounting plate 25 and the cylindrical body 23C.

As shown in FIG. 1, the track frame 13
At the lower edges of the left and right side walls, a groove-shaped support portion 2 having a downward opening shape is provided.
8 are formed at intervals in the longitudinal direction of the frame, and the left and right support portions 28 are provided with support shafts 30 of a plurality of rolling wheels 29 provided at intervals in the longitudinal direction (front-back direction).
Is fitted. The support shaft 30 is mounted so as not to be accidentally detached by being tightened by a fastener 31 such as a bolt and a nut. As a result, the rolling wheels 29 are arranged at the lower part of the inner periphery of the crawler traveling body 16 and the track frame 1
The third support portion 28 is supported in a left-right bilateral manner while being positioned in front and rear.

The front rotation follower 14 and the rear rotation follower 15 also have the same structure as the rolling wheel 29, such as the support portion 28, the support shafts 14A and 15A, the fastener 31 and the like. The left and right semi-crawlers 3 perform a pitching operation following (following) irregularities in a field or the like by swinging the track frame 13 vertically about the swing support shaft 18 as a fulcrum independently of the left and right. Swing amount restraint means 32 is provided which can smoothly travel on rough terrain and the like, and restrains the vertical swing amount within a predetermined range.

The swinging amount restraining means 32 has a mounting plate 33 fixedly extended in front of the support 19 (which may be rearward or forward and backward, but will be described only in the forward direction). Front and rear pair of L-shaped flanges 34
A roller body 35 that rotates around the longitudinal center axis of the pair of flanges 34 (downward in the case of backwards) is mounted between the pair of flanges 34. On the other hand, on the track frame 13 side, an outer mounting plate 36 located on the outer surface side of the roller body 35 is fixed upright.
An inner mounting plate (not shown) of substantially the same shape is fixedly connected by a bolt fastener or the like so as to be located on the inner surface side of the roller body 35, and between the inner and outer mounting plates 36, an upper and lower stopper 40 serving as a distance collar for both. , 41 are attached, and when the upper and lower stoppers 40, 41 abut against the rollers 35, the vertical swing amount of the track frame 13 is restrained within a predetermined range.

The front rotation follower 14, which is the slack side of the rubber crawler 16 when the rotation driver 12 rotates in the F direction,
The tension (tension) adjusting device 24 can freely adjust the tension. The tension (tension) adjusting device 24 slides the shaft portion (piston) of the follower support member 42 to a cylindrical body 44 containing a coil spring 43. The strength can be adjusted by the screw feed amount of the adjusting tool 45 which is freely fitted and inserted and has a screw-feedable contact plate. The tension adjusting means (device) 24 may be of a fluid pressure type instead of a spring type.

Holes 40 for removing foreign substances such as mud and wallaks which have entered the track frame 13 are provided on the left and right outer side walls 13B of the track frame 13 so as to penetrate the left and right side walls 13B. ing. The holes 40 are provided so as to correspond between the plurality of rolling wheels 29. Therefore, in the illustrated example, the holes 40 are formed at two locations corresponding to between the front and rear three rolling wheels 29. The hole 40 is formed in a long hole shape in front and back so as to overlap the outer peripheral portion of the front and rear rolling wheels 29 (upper than the support shaft 30) in a side view.

Therefore, during the traveling of the semi-crawler, etc., foreign matter that has climbed on the lower inner peripheral surface of the crawler traveling body 16 is caught by the rolling wheels 29 and
3 can be directly discharged to the outside through the hole 40, thereby preventing the accumulation of foreign matter in the track frame 13. FIG.
As shown in FIG. 5, during maintenance such as cleaning, a foreign matter removing device 41 such as a screwdriver or a spatula can be inserted into the track frame 13 through the hole 40, and foreign matter accumulated in the track frame 13 can be removed. Foreign matter adhering to the rolling wheel 29 can be removed by scraping downward.

In particular, by forming the holes 40 in front and rear of each of the rolling wheels 29, foreign matters between the rolling wheels 29 can be easily removed, and by overlapping with the outer peripheral portion of the rolling wheels 29. In addition, it is possible to easily remove foreign matter attached to the outer peripheral portion. In addition, the presence of the holes 40 can reduce the adhesion of mud to the inner surface of the side wall 13B, and can reduce the burden of cleaning and the like. The hole 40 can be formed to be long so as to extend before and after all the rolling wheels 29. However, in order to prevent a decrease in the strength of the track frame 13, the hole 40 is provided between the rolling wheels 29 as in the above embodiment. It is preferable to form it, and by providing it corresponding to the upper side of the rolling wheel 29,
It becomes easy to clean the upper part (the bottom part of the groove) in the track frame 13 where it becomes more difficult to remove the foreign matter.

It is also possible to form an elliptical shape that is long in the front and back, or to form one or more circular ones between the rolling wheels 29 as shown in another embodiment in FIG. Also, holes for removing foreign matter as shown in FIG. 1 or FIG. 4 can be formed in the left and right inner side walls 13C of the track frame 13. The present invention can be applied to a so-called full crawler, but is more useful for a semi-crawler having a relatively compact structure as described above. It can also be used as a car.

[0026]

As described above in detail, according to the present invention, it is possible to prevent foreign matter from accumulating in the track frame and to improve maintenance.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler traveling device according to an embodiment of the present invention.

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

FIG. 3 is a side view showing a semi-crawler type tractor equipped with the crawler traveling device according to the embodiment of the present invention.

FIG. 4 is a side view showing another embodiment of the track frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor (semi-crawler type tractor) 2 Front wheel 3 Semi-crawler (crawler traveling device) 13 Track frame 13B Side wall 16 Crawler traveling body 29 Rolling wheel 40 hole

Claims (4)

[Claims] 1. A crawler traveling device in which a plurality of rolling wheels (29) disposed at the lower part of the inner periphery of a crawler traveling body (16) are supported on both left and right sides by a track frame (13). ), A hole (40) for removing foreign matter such as mud entering the track frame (13) is formed in the side wall (13B) of the crawler traveling device. 2. The method according to claim 1, wherein the hole (40) has a plurality of rolling wheels (29).
2. The device according to claim 1, wherein the second member is formed so as to correspond to the space therebetween.
A crawler traveling device according to claim 1. 3. The crawler traveling device according to claim 1, wherein the hole (40) overlaps an outer peripheral portion of the rolling wheel (29) in a side view. 4. A tractor body (1A) having a wheel-shaped front wheel (2) at a front portion and a rear wheel (3) at a rear portion.
A semi-crawler type tractor, comprising the crawler traveling device according to any one of the preceding claims.