KR20120102021A - Semi-crawler - Google Patents

Abstract

PURPOSE: A semi-crawler is provided to be applied to any kind of tractor including a farming tractor by comprising a caterpillar. CONSTITUTION: A semi-crawler comprises a sprocket, a speed increaser, a track frame, and a caterpillar. The speed increaser amplifies the RPM of an input shaft connected the shaft of the rear wheel of a tractor into predetermined ratio and outputs the rotation to an output shaft connected to the sprocket. The track frame maintains the rotation of a front idler, a track crawler, and a rear idler. The caterpillar is mounted on the front idler and the rear idler connected to the track frame. The input part of the speed increaser is composed of gears and composed to be connected to the shaft of the rear wheel of a tractor.

Description

Semi crawler {SEMI-CRAWLER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-crawler mounted on an agricultural tractor used in uneven lands, soft lands, wetlands, pustules, and the like.

The tractor can be divided into a wheel type and a crawler type according to the driving means, and the crawler type is further divided into a full crawler type and a semi crawler type. Both wheel type and crawler type can be widely used for tillage, sowing, cultivation, weeding, harvesting and transporting in faucet, field farming, dairy farming, etc. Among these works, it is particularly suitable for use on a soft land or a solid land, and also suitable for a work requiring traction.

Patent document 1 relates to a tractor capable of replacing the rear wheel of a wheel-type tractor with a semi-crawler, and the traveling rolling element is provided in the tractor so as to make the circumferential speed between the rotating drive body and the front wheel of the semi-crawler almost constant. .

Patent document 2 relates to a tractor that can replace the rear wheel of a wheel-type tractor into a semi-crawler, the semi-crawler is mounted to the tractor body through the mounting frame, the swing shaft of the semi-crawler is placed on the upper part of the mounting frame It is prepared. In relation to the position of the swinging axis, the rotary drive body of the semi crawler is supported by a bracket that protrudes from the track frame through the other swinging axis.

Patent document 3 relates to a method for replacing a semi-crawler in a tractor. According to the method, when replacing, the semi-crawler is mounted after the track frame is fixed by the locking means, and then the swing limiting means is mounted. The locking means are released after the lock is in place.

Patent document 4 is related with the tractor provided with a crawler unit, and a crawler unit is provided with the transmission case (gear case). The lower part of this transmission case 17 is provided with the support part, and the support shaft is freely supported by the rotational axis around the axial center of a left-right direction.

Japanese Patent Laid-Open No. 10-45052 Japanese Unexamined Patent Publication No. 10-45060 Japanese Patent Publication No. 3155470 Japanese Unexamined Patent Publication No. 2003-276659

In the conventional semi crawler, the work of replacing the semi crawler on the rear axle is quite complicated. In particular, when replacing the rear wheels with oscillating semi-crawlers, it is necessary to coincide the shaft centers of the rear axle with the rotational driving bodies (drums, sprocket wheels, etc.) of the crawler. Therefore, the task is more difficult. In addition, it is also very difficult to match the shaft center of the support shaft (bearing section) of the swing shaft and the support shaft of the tractor body, and the replacement work is not only heavy labor but also requires a long time.

In order to eliminate it, the provision of the apparatus for restricting the swing range of a semi-crawler is also performed.

In addition, in the conventional semi-crawler, in order to replace the semi-crawler, the tractor has a traveling rolling element for making the circumferential speed of the semi-crawler's rotational drive and the front wheel almost constant at a constant speed or in advance, and does not have such a traveling rolling element. It was difficult to equip the tractor with a semi crawler.

In addition, in the conventional semi-crawler, since the electric case is connected to a drive shaft such as a tractor, and a drive shaft equipped with a crawler belt is connected to the outside thereof, the rear wheel cannot be replaced with a semi-crawler depending on the type of tractor. There is a case where the body width becomes unnecessarily large.

Thus, the present invention eliminates the need to provide a traveling rolling element for making the circumferential speed of the semi-crawler's rotating drive body and the front wheel almost constant at the tractor, and provides a semi-crawler that can be mounted to a tractor having no such traveling rolling element. For the purpose of

It is also an object of the present invention to provide a semi-crawler that can prevent the occurrence of the pitching phenomenon by significantly reducing the swing range without requiring an additional configuration for limiting the swing of the semi-crawler.

It is also an object of the present invention to provide a semi-crawler that does not require a locking means for limiting the swing range of the semi-crawler when the semi-crawler is mounted.

In addition, an object of the present invention is to provide a semi-crawler that facilitates the steering (steering) during the forward and retract of the tractor, and is difficult to attach mud and the like to the semi-crawler's frame and to remove the attached mud and the like. .

It is another object of the present invention to provide a compact semi crawler.

Moreover, an object of this invention is to provide the semi crawler which can replace | exchange a rubber crawler easily after mounting a semi crawler to a tractor.

Another object of the present invention is to provide a semi-crawler having an input part capable of easily connecting the semi-crawler to the drive shaft of the rear wheel while replacing the rear wheel of a tractor or the like with a semi-crawler, and capable of coping with various outer diameter dimensions of the tire mounting portion. It is done.

Furthermore, a joint frame for connecting a pair of left and right semi crawlers and at the same time to be fixed to the body of an agricultural tractor, the joint frame is provided with a swing angle limiting device of the track frame of each semi crawler to facilitate a pair of left and right semi crawlers It is an object of the present invention to provide a semi-crawler assembly that can be used for an agricultural tractor, which is securely fixed and prevents contact between the crawler device and the tractor body in advance.

The semi-crawler according to the present invention is a semi-crawler that can be used in an agricultural tractor that can be driven by rotating at least the rear axle by means of a drive means, the semi-crawler having a large diameter having a circumferential portion with teeth and a bearing portion with a fixed output shaft at the center thereof. A sprocket, an increaser which increases the rotational speed of the input shaft connected to the axle of the rear wheel of the agricultural tractor at a predetermined ratio, and outputs to the output shaft connected to the sprocket having a large diameter; A frame connecting frame having two edges spaced apart from each other, wherein the speed reducer is disposed between the two edges, and one end of both of the two edges is connected to the speed reducer; An axle frame connecting frame having the other end coupled to the swing shaft through the base portion, A cylindrical rocking bearing portion for holding the front idler, the track crawler and the rear idler freely to rotate, and freely holding the rocking shaft of the axle-frame connecting frame is fixed, and the rocking bearing portion is A track frame disposed near the axis of rotation of the track crawler, the large diameter sprocket, and an infinite rail spanning the outer peripheries of the front idler, track crawler, and rear idler held by the track frame. The sprocket having a large diameter, the portion connecting the toothed portion and the bearing portion of the output shaft of the large diameter sprocket is curved to form a space, in the space, the gearbox and the axle frame connection The two edges of the axle-frame connecting frame to accommodate a portion of the frame Extends from the speed reducer accommodated in the space and is coupled to the oscillation shaft through the base portion, the oscillation shaft being rotatably inserted in the cylindrical oscillation bearing portion of the track frame and within the full width of the infinite track. The large diameter sprocket, the speed increaser, the axle frame connecting frame and the track frame are accommodated, and a through hole is provided in an input gear shaft of the speed increaser to insert one end of the input shaft into the through hole. And a flange portion at the other end of the input shaft, and the wheel disk of the axle of the rear wheel of the agricultural tractor is fixed to the flange portion.

In addition, the semi-crawler that can be used in the agricultural tractor according to the present invention is also provided with a swing angle limiting device consisting of a shock absorber of the spring case fixed to the axle-frame connecting frame and a stopper fixed to the track frame, the track frame When the stopper presses the shock absorber of the spring case according to the swing of the, the shock absorber of the spring case is characterized in that it limits the swing angle of the semi crawler against the pressing force.

According to the semi-crawler which can be used for the agricultural tractor according to the present invention, since it is not necessary to provide the tractor with a traveling rolling element for substantially constant circumferential speed between the rotating drive body and the front wheel of the semi-crawler, Also, the semi-crawler according to the present invention can be mounted.

In addition, according to the semi-crawler that can be used in the agricultural tractor according to the present invention, it is possible to prevent the occurrence of the pitching phenomenon by significantly reducing the swing range without requiring additional configuration to limit the swing of the semi-crawler.

Moreover, according to the semi crawler which can be used for the agricultural tractor which concerns on this invention, when mounting a semi crawler, the locking means for restricting the swing range of a semi crawler is not needed.

Moreover, according to the semi-crawler which can be used for the agricultural tractor which concerns on this invention, the steering | movement at the time of forward and retreat of a tractor is easy, and also mud etc. are hard to adhere to the frame of a semi crawler, and it is easy to remove the attached mud etc. .

Moreover, according to the semi crawler which can be used for the agricultural tractor which concerns on this invention, a compact semi crawler can be provided.

According to the present invention, the rubber crawler can be easily replaced after the semi crawler is mounted on the tractor.

According to the semi-crawler which can be used for the agricultural tractor according to the present invention, when the semi-crawler is mounted to the tractor, the semi-crawler can be easily connected to a drive shaft of a tractor or the like, and has an input portion that can cope with the outer diameter of various tire mounting portions. You can provide a semi crawler.

In addition, according to the semi-crawler assembly that can be used in the agricultural tractor according to the present invention, it is provided with a joint frame for connecting a pair of left and right semi-crawler and at the same time fixed to the body of the agricultural tractor body, the joint frame is a track frame of each semi crawler By providing an oscillation angle regulating device, it is possible to provide a semi-crawler assembly that can be used for an agricultural tractor that easily fixes a pair of left and right semi-crawlers and prevents contact between the crawler device and the tractor body in advance.

BRIEF DESCRIPTION OF THE DRAWINGS The front view of the tractor which attached the semi-crawler which can be used for the agricultural tractor which concerns on one Embodiment of this invention to the rear wheel.
FIG. 2 is an enlarged front view of a semi crawler according to one embodiment of the present invention shown in FIG. 1.
FIG. 3 is a simplified view of a part of the semi crawler along the line 3A-3A in FIG. 1.
4A is a simplified enlarged front view of a speed increaser of a semi crawler according to one embodiment of the present invention.
4B is a partial cross-sectional view of a simplified speed increaser of a semi crawler according to one embodiment of the present invention viewed in the direction of the arrow along line 4B-4B in FIG. 4A.
5 is a perspective view illustrating a rear idler of a semi crawler according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating the rear idler and track frame shown in FIG. 5.
Fig. 7A is an enlarged front view that simplifies the speed increaser, track frame, and rocking angle regulating device of the semi-crawler according to one embodiment of the present invention.
7B is an enlarged front view that simplifies the swing angle limiting device of a track frame of a semi crawler according to an embodiment of the present invention.
Fig. 7C is a simplified enlarged side view of the rocking angle restricting device of the track frame of the semi crawler according to one embodiment of the present invention.
8A is a simplified enlarged side view for explaining a configuration in which a left and right semi crawler according to an embodiment of the present invention is connected to a joint frame.
8B is a simplified enlarged plan view for explaining a configuration in which the left and right semi crawlers according to one embodiment of the present invention are connected by a joint frame.
FIG. 9 (a) is a perspective view of a joint frame for connecting the left and right semi crawlers according to an embodiment of the present invention, and FIG. 9 (b) is for connecting the joint frame and the semi crawler device shown in FIG. 9 (a). It is a perspective view for demonstrating a joint bracket, and FIG. 9 (b) is a perspective view of a joint frame.
10 (a) to 10 (c) are views for explaining a method for attaching a semi crawler according to an embodiment of the present invention to the axle of the tractor rear wheel.
11 is a simplified side view showing a configuration in which the left and right semi crawlers according to one embodiment of the present invention are mounted on the axle of the tractor rear wheel, and the left and right semi crawlers are connected by a joint frame and fixed to the body body of the tractor.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of the semi crawler which can be used for the agricultural tractor which concerns on this invention based on an accompanying drawing is described.

In addition, the thickness, length, shape, space | interval of members, gap | interval etc. of each member were appropriately expanded, reduced, deformed, simplified, etc. in the whole figure in order to make understanding easy. In addition, the top, bottom, left, and right expressions at the time of describing a drawing shall show the direction which follows the surface of the drawing in the state toward the drawing.

1 is a side view illustrating a state in which a semi crawler 20 according to an embodiment of the present invention is mounted in a state of being replaced with a rear wheel of a tractor body 100 that is an example of a conventional agricultural tractor, and FIG. 20) is a front view seen from the same direction.

[Semi-Crawler Overview]

As shown in FIG. 1, the tractor body 100 includes a front wheel 80 and a rear wheel 90 represented by a dashed two-dot chain line. In FIG. 1, a rear wheel 90 according to an embodiment of the present invention is semi-finished. Replaced with a crawler (20). 1 shows a state in which only the left rear wheel is replaced, but the right rear wheel is also replaced.

The tractor body 100 also includes an engine (not shown) and a cabin 70 covered with the bonnet 60, and the cabin 70 includes a windshield 71, a lifting door 72, and a side. It is surrounded by the glass 73 and the rear glass 74, and the inside thereof is provided with a driver's seat 75, a steering wheel 76 for the direction operation of the front wheel 80 of the tractor, the transmission 77 and the like. The lifting door 72 can be opened and closed to rotate about the hinge 78.

The rear wheel axle 50 on which the rear wheel 90 is mounted is mounted from the engine via a transmission device, a differential gear 270, and the like (FIGS. 8A and 8B) mounted on the body of the tractor body 100. Power is transmitted. When the large diameter sprocket 7 rotates in the direction of the arrow F, the tractor body 100 moves forward.

As shown in FIG. 2 in detail, the semi-crawler 20 is equipped with the sprocket 7 and the track frame 1 of the large diameter of the rotation transmission body. The large sprocket 7 is supported by the track frame 1 via the speed increaser 4 and the axle frame connecting frame 2, as will be described later in detail.

In the track frame 1, the front idler 8 is freely maintained by a tensioner 10, and the rear idler 9 and the plurality of track crawlers 11 are freely maintained by their respective rotation axes. It is becoming. A rubber crawler 12 spans the outer circumference of the large sprocket 7, the front idler 8, the rear idler 9 and the track crawler 11.

The rubber crawler 12 is an infinite track, and the front idler 8, the rear idler 9, and the plurality of track crawlers 11 function as a flow wheel. In addition, instead of the sprocket 7, a drum type or a roller type can be used, and the rubber crawler 12 can be changed accordingly.

The sprocket shaft 5 of the large diameter sprocket 7 is connected to the rear wheel shaft 50 of the tractor via the three cogwheels of the speed increaser 4 mentioned later in detail. Projections 4a and 4b are formed on both sides in the horizontal direction from the speed increaser 4, and two edges 2a and 2b of the axle frame connecting frame 2 are respectively formed on the two projections 4a and 4b. It is connected. The edges are connected to the joint frame 250 via the joint bracket 230 (FIGS. 7A, 8A, 8B), and the lower end, via the spring case 260, as will be described later in detail. It is connected to the rocking shaft 6 of the track frame 1 (FIG. 7C).

As shown in FIG. 7C, the swing shaft 6 is rotatably inserted into the cylindrical swing bearing portion 24 fixed to the track frame 1. As a result, the track frame 1 can swing against the tractor body, whereby the semi-crawler 20 can smoothly follow the unevenness of the ground, so that the vertical movement of the tractor body is suppressed and stable and highly accurate work is performed. Will be able to. However, if the track frame 1 is allowed to swing unlimitedly with respect to the tractor body, the rubber crawler 12 of the semi-crawler 20 may come into contact with the tractor body, so that the spring case will be described later. The swing angle limiting device between the shock absorber 260 and the stopper fixed to the track frame 1 restricts the swing angle of the semi crawler 20 to within a predetermined range.

In the large diameter sprocket 7, as shown in FIG. 3, the part between the circumferential part (teeth circle) in which the tooth | gear 7a was formed, and the bearing 7b of the sprocket shaft 5 is curved, and it spreads over one round. A space is formed between the imaginary plane connecting the tooth 7a and the imaginary orthogonal plane passing through the bearing 7b. In the space, the speed increaser 4, the input unit 55 connected thereto, the wheel disc 51 of the rear axle 50 of the tractor, the axle frame connecting frame 2, and the track frame 1 It is accepted.

As an example of the space formed by the sprocket 7, the portion where the tooth 7a is formed (the tooth root circle) and the portion of the bearing 7b of the sprocket shaft 5 are shifted in the horizontal direction and the portion connecting the portions is approximately. Although an example of bending with a ruler is given, a space may be formed by bending the connecting portion to form a gentle curve or may be formed by bending at a right angle.

[Accelerator]

Generally, the outer diameter of the tractor rear wheel 90 and the pitch circle diameter (PCD) of the large diameter sprocket 7 of the semi crawler 20 are different. In the embodiment of the present invention, as shown in FIG. Since the diameter of the sprocket 7 is smaller than the outer diameter, when the transmission ratio of the transmission of the tractor is used as it is, the semi-crawler (when compared with the peripheral speed of the rear wheel when the rear wheel 90 is mounted on the rear wheel shaft 50 of the tractor) When 20) is attached, the circumferential speed of the rubber crawler 12 becomes slow. As a result, especially in four-wheel drive, since the speed of the front wheel and the speed of the rubber crawler 12 of the semi-crawler 20 become different, a front wheel will revolve.

In order to prevent such a situation, it has conventionally been necessary to provide a speed difference regulator such as a traveling rolling element in a tractor or to prepare a semi-crawler of a sprocket of many different dimensions. The speed increaser 4 of the semi-crawler according to the present invention increases the number of revolutions of the rear wheel shaft 50 of the tractor and transmits it to the large diameter sprocket 7 of the semi-crawler 20, thereby adjusting such a speed difference to the tractor. There is no need to provide a structure.

FIG. 3 is a partial cross-sectional view showing a simplified configuration of a part of the semi-crawler seen along the lines 3A-3A of FIGS. 1 and 2 in the direction of the arrow. FIG. 4A is an enlarged front view illustrating the speed increaser 4 in a simplified manner. 4B is a partial cross-sectional view of the speed increaser 4 seen in the direction of the arrow along the dashed-dotted line connecting 4B-4B in FIG. 4A.

As shown in Fig. 2 and Fig. 3, protrusions 4a and 4b are formed on both sides in the horizontal direction from the speed increaser 4, and the axle and frame connecting frames 2 are respectively formed on the two protrusions 4a and 4b. Two edges 2a and 2b of are connected. The rims are connected to the joint frame 250 via the joint bracket 230 (FIGS. 7A, 8A, 8B), and the lower end of the swing shaft of the track frame 1 via the spring case 260. (6) (FIG. 7C). The swing shaft 6 is rotatably inserted in the cylindrical swing bearing portion 24 fixed to the track frame 1.

The wheel of the rear wheel is normally attached to the disk 51 of the rear wheel shaft 50 of the tractor. In FIG. 3, the disk 51 is connected to the input shaft 55a of the input part 55 of the speed increaser 4 instead of the wheel of a rear wheel. The sprocket shaft 5 of the large diameter sprocket 7 is connected to the output side of the speed increaser 4. The method of connecting the input shaft 55a to the disk 51 will be described later.

As shown in FIG. 4A and FIG. 4B, the speed increaser 4 has the gear case 45, The inside of which has the cogwheel 55b, the cogwheel 47, and the cogwheel 44 of which the number of cogs is different. Equipped. The gears are engaged in order, and the gear 55b and the gear 44 are not engaged.

The gear 55b constitutes the input unit 55 together with the input shaft 55a. The input shaft 55a is formed in a cylindrical shape, the gear 55b does not have a rotation axis, and has a through hole in which the input shaft 55a is inserted. The through hole is female splined in the circumferential direction, and the male spline is formed in the outer circumferential surface of the input shaft 55a in the circumferential direction. The input shaft 55a penetrates into the center of the cogwheel 55b and the female spline of the cogwheel 55b meshes with the male spline of the input shaft 55a so that the cogwheel 55b rotates together with the input shaft 55a. do.

A flange portion is integrally formed at the end of the input shaft 55a, and the flange portion is bolted to the wheel disk 51 of the tractor rear axle 50. In addition, the sprocket shaft 5 of the large sprocket 7 is integrally connected to the rotation shaft of the gear 44.

The speed increaser 4 functions as a speed-up means which raises the rotation speed of an input in an output using the difference in the number of teeth of the gear 55b and the gear 44. The gear 47 rotates back and forth between the cog wheels to rotate the cog wheel 55b and the cog wheel 44 in the same direction, and does not contribute to the shift between the cog wheels.

As shown in FIG. 4B, the gearwheel 55b, the gearwheel 47, and the gearwheel 44 are gear cases formed by the bearings 42a and 42b, the bearings 47a and 47b, and the bearings 44a and 44b, respectively. It is maintained at 45 freely.

In the speed increaser 4 which concerns on one Embodiment shown to FIG. 4A and FIG. 4B, for example, the number of teeth Z55 of the gear 55b is set to 28 and the number of teeth Z44 of the gear 44 is, for example. Let 16. In this case, the speed increase ratio r is as follows.

Speed ratio (r) = Z55 / Z44 = 28/16 = 1.75

For example, when the traveling speed by a tractor equipped with a rear wheel of 1150 mm outer diameter is 28.7 km / h, instead of the rear wheel, a semi crawler 20 having a large diameter sprocket 7 is mounted, and the large When the pitch of the sprocket 7 of diameter is 90 mm, the number of teeth is 23, and the pitch circle diameter PCD is 659.24 mm, the ratio Nsr of the rotation speed Ns of the sprocket shaft 5 is as follows.

Nsr = 1150 / 659.24 = 1.744 / 1

That is, the ratio of the rotation speed can be grasped | ascertained as a gear ratio.

With respect to the speed increase ratio 1.744, the speed increase ratio r by the speed increaser 4 is 1.75, and 1.75 / 1.744 = 1 / 0.997. Therefore, the speed increaser 4 can sufficiently eliminate the difference between the circumferential speed of the rear wheel and the circumferential speed of the large diameter sprocket 7 of the semi crawler 20, so that the rear wheel can be replaced with the semi crawler 20. This is obvious.

As a result, the difference between the peripheral speed of the front wheel and the speed of the rubber crawler 12 of the semi crawler 20 can also be eliminated.

[Rocking device]

The rocking mechanism of the semi crawler 20 will be described again with reference to FIGS. 2, 3 and 7A to 7C. The swinging mechanism is achieved by the axle frame coupling frame 2 and the swinging shaft 6 mounted on the track frame 1.

The axle frame connecting frame 2 has side edges 2a and 2b and a spring case 260 connected to the swing shaft 6. The side edges 2a and 2b are respectively connected to the projections 4a and 4b on both sides in the horizontal direction of the speed increaser as described above.

Moreover, as shown in FIG. 2, the side edges 2a and 2b are spaced apart, and are arrange | positioned so that the flange part of the disk 51 and the input shaft 55a of the rear wheel shaft 50 of a tractor may be sandwiched between them. . As shown in Fig. 3, the side edges 2a and 2b are arranged obliquely toward the vehicle body side of the tractor from the projections 4a and 4b on both sides in the horizontal direction of the speed increaser. By such a configuration, the axle-frame connecting frame 2, for example, does not need a space for avoiding the sprocket 7 in the horizontal direction. As a result, the semi crawler 20 becomes compact, and since the axle frame connecting frame 2 fits within the width of the rubber crawler 12, it becomes difficult to attach mud thereto.

The swing shaft 6 of the axle frame connecting frame 2 is rotatably inserted into the swing bearing portion 24 fixed to the track frame 1. As shown in FIG. 2, the rotation center of the swing shaft 6 is located on a straight line passing through the central axis of the rear wheel shaft 50 of the tractor and the central axis of the sprocket shaft 5 of the large sprocket 7. . For this reason, the sprocket 7 can rock over the front and back of a tractor centering on the swing shaft 6.

In addition, the swing bearing portion 24 and the swing shaft 6 are mounted at the lowest position of the track frame 1. That is, as shown in FIG. 2, the oscillation shaft 6 is provided in the same level as the rotation shaft of the track crawler 11. Since the swing shaft 6 is subjected to the vehicle weight of the tractor, the swing amplitude of the semi crawler 20 is reduced when the swing center is at the position closest to the ground surface, for example, the swing range is 3 degrees. The angle can be suppressed in the range of about 5 degrees. Therefore, the occurrence of the pitching phenomenon is effectively suppressed even when traveling on the uneven ground.

However, the fluctuation of the semi crawler 20 may increase due to conditions such as the inclination of the ground, and a situation may occur in which some parts contact the vehicle body. Therefore, the swing angle limiting device constituted by the shock absorber of the spring case 260 and the stopper 220t fixed to the track frame 1 restricts the swing angle of the semi crawler 20 to within a predetermined range.

7A, 7B, and 7C, the rocking angle restricting device will be described. Two recesses are formed in the spring case 260 at the position where the swing shaft 6 is fitted, and each of the spring cases 260 is provided with a shock absorbing means comprising a spring 260s and a pin 260p surrounded by the spring case 260. In addition, as shown in FIG. 7B, in the state where the tractor body is horizontal, two locking portions 220t protrude from the outer wall surface of the track frame 1 so as to contact the head of the pin 260p, which is a shock absorbing means. have. When the semi-crawler 20 swings together with the track frame 1, for example, the stopper portion 220t is caused by the swing (tilt) of the track frame 1, such as the locking portion 220t indicated by an oblique line in Fig. 7A. One of the left ones, i.e., the one on the left in FIG. 7A, moves relatively downward to press the head of the left pin 260p. As a result, the spring 260s pressed by the head of the pin generates an elastic force for returning the head of the pin to its original position, thereby trying to suppress the inclination of the swing of the track frame 1 up to its inclination. However, when the rocking force is large, the bottom end of the pin 260p pushed in stops the rocking by colliding with the bottom of the recess of the spring case 260. The swing angle ranges, for example, up to about 4 degrees from the vertical line.

[Track frame]

As shown in FIG. 6, the track frame 1 is a shape arranged so as to become a cross-sectional shape in which the bottom is opened by rotating approximately a letter, and an inclined surface is formed on the upper side so that the jumping mud easily falls. However, it may be flat.

As shown in FIG. 2, the front idler 8 is rotatably held in the track frame 1 via the tensioner 10, and the rear idler 9 and the plurality of track crawlers 11 are each rotated by a rotating shaft. It is freely rotated.

(Tensioner)

The tensioner 10 is a tension adjusting means for adjusting the tension of the rubber crawler 12 of the semi crawler 20 by applying a pressing force to the front idler 8. As shown in FIG. 1, when the large sprocket 7 is rotated in the direction of the arrow F, the tractor body 100 moves forward, and when rotated in the reverse direction, the tractor moves backward. At that time, the track frame 1 swings. Tension or relaxation of the rubber crawler. For example, the tension of the rubber crawler 12 is adjusted at that time.

The tensioner 10 includes a spring device 10s having a spring and a rod 10r. As shown in FIG. 2, the spring device 10s of the tensioner 10 is horizontal to the inside of the track frame 1. It is arranged in the direction and fixed. The rotary shaft 8a of the front idler 8 is attached to the tip end of the rod 10r, and the front idler 8 is freely held. The center of rotation of the front idler 8 is at any position on a straight line in the moving direction of the rod 10r.

When the rod 10r reciprocates in the horizontal direction, the spring of the spring device 10s expands and contracts correspondingly. For example, when the track frame 1 swings and the front idler 8 moves inward, the rod 10r contracts the spring of the spring device 10s by a predetermined length in accordance with the movement distance. When the swing of the track frame 1 stops, the rod 10r is pushed back by the spring force of the spring device 10s, and the front idler 8 is returned to its original position. Therefore, a cutout is formed on the upper surface of the track frame 1 so that the front idler 8 can move (not shown).

In this embodiment, although the tensioner 10 is arrange | positioned in the horizontal direction as mentioned above, it can also mount by tilting from a horizontal direction. For example, the tensioner 10 is connected along the line connecting the intersection point of the line which extends the rubber crawler 12 of the two linear parts which sandwich the front idler 8, and the rotation center of the front idler 8. It can also be installed.

However, when mounted inclined in the horizontal direction, part of the spring contacting surface of the spring device 10s may be greatly worn due to the violent movement of the front idler 8, thereby resulting in the durability of the tensioner 10. It is necessary to take this into consideration because there may be a problem or a smooth motion may be hindered.

(Rear idler)

FIG. 5 is a perspective view schematically showing the rear idler 9 of the semi-crawler according to one embodiment of the present invention, and FIG. 6 is a cross-sectional view showing a state in which the rear idler 9 is mounted on the track frame 1.

As shown in FIG. 2, the rear idler 9 is normally rotatably held in the holding position 9a by the bolt 92 (FIG. 6) by the bolt 92 (FIG. 6). 12) To remove or install 12, loosen the bolt 92 and move the rotating shaft 91 of the rear idler 9 from the holding position 9a to the retracted position 9b, that is, to the position of the rear idler 9-1. You can move it. This loosens the rubber crawler 12.

In more detail, as shown in FIG. 6, the through-hole with which the rotating shaft 91 is freely rotated is formed in the rotating center part 93 of the rear idler 9. As shown in FIG. Moreover, the slider 94 is attached to the both sides of the rotation center 93, and the edge part of the rotating shaft 91 is fitted in the slider 94, and is fixed.

As shown in FIG. 6, a pair of upper and lower guide rails 95 are fixed to portions corresponding to the positions 9a to 9b on both sides of the inner surface of the track frame 1. Each slider 94 is arrange | positioned between each pair of upper and lower guide rails 95, and the slider 94 can move smoothly between a pair of guide rails.

Moreover, the slider 94 is provided with the screw hole 96 into which the fixing bolt 92 is put on the axis line of the rotating shaft 91. As shown in FIG. The rear idler 9 is held at the position 9a of the track frame 1 by tightening the fixing bolt 92 by matching the screw hole 96 with the hole formed at the position 9a of the track frame 1. And the rear idler 9 becomes a flow wheel at that position.

On the other hand, when the two fixing bolts 92 are loosened, each slider 94 can smoothly move between the upper and lower pairs of guide rails 95 to the retracted position 9b. The retracted position 9b is for temporarily retracting the rear idler 9, and since the rear idler 9 does not need to be fixed at the position, a hole for fixing bolt is formed at the position of the track frame 1. It is not necessary to do it.

When the operation | work of attaching the rubber crawler 12 etc. is complete | finished, the rear idler 9 is moved from the position 9b to the position 9a with the movement of the slider 94, and the rear idler by the fixing bolt 92 is carried out. (9) is fixed to the position 9a.

The reason why the rear idler 9 can be moved between the position 9a and the position 9b is as follows.

As described above, the combination of the front idler 8 and the tensioner 10 functions as a tension adjusting device or a shock absorber of the rubber crawler 12 during traveling. Moreover, compared with the full crawler used for the conventional compact excavator etc., the PCD of the sprocket of a semi crawler is one step larger. Therefore, since the looseness of the rubber crawler 12 is small only by moving the front idler 8 to an inner position, it is difficult to remove or attach it.

In the conventional tractor, the sprocket corresponding to the sprocket having a large diameter is divided into two or three, and a method of mounting the divided one by one is used. However, in this method, a split sprocket must be used and the mounting shaft of the sprocket must be doubled, resulting in an increase in cost and an increase in mounting work time.

Therefore, in the semi-crawler of the present invention, the rear idler 9 can be easily moved, so that the operation of detaching or mounting the rubber crawler 12 can be easily performed in a short time.

[Rubber crawler]

As shown in FIG. 2, the rubber crawler 12 spans the outer circumference of the sprocket 7, the front idler 8, the rear idler 9, and the plurality of track crawlers 11 having a large diameter. A ground lug 12a for grip with the ground surface is formed at equal intervals, and a plurality of guide protrusions engaging with the teeth of the sprocket 7 of large diameter are formed inside (not shown).

(Ground plane)

As shown in FIG. 2, the part which the some track crawler 11 of the rubber crawler 12 contact | connects the ground surface, such as pustules, but the part wound by the front idler 8 and the rear idler 9 floated from the ground surface. It is in a state. In more detail, from the position located in front of the plurality of track crawlers 11 to the part hanging on the front idler 8 is inclined so as to be lifted upward, and from the position located behind the plurality of track crawlers 11. The part caught by the rear idler 9 is inclined so as to be lifted upward.

In this way, the predetermined portions of the front and rear sides of the rubber crawler 12 that are grounded to the ground surface are lifted upward to facilitate steering operation. Lifting of the rubber crawler 12 on the front idler 8 side facilitates the operation of the steering wheel 76 of the tractor for changing the traveling direction of the tractor when the tractor body 100 is advanced, and also the rear idler. Lifting of the rubber crawler 12 on the (9) side facilitates the operation of the steering wheel 76 of the tractor for changing the traveling direction of the tractor when the tractor body 100 is retracted. Therefore, it can turn small and a turning performance improves.

In addition, in the mud, the part caught by the track crawler 11 of the rubber crawler 12 sinks somewhat, so that the front and rear excited parts come into contact with the mud, thereby allowing the ground pressure to be more dispersed.

(Compact)

As shown in FIG. 3, in the semi-crawler 20 which concerns on this invention, the sprocket 7 of large diameter, the gearbox 4, the axle frame coupling frame 2, and the inside of the full width | variety of the rubber crawler 12 and All of the track frame 1 is accommodated, and neither part protrudes from it.

As described above, as described above, the gear 7 of the large-diameter sprocket 7 from the toothed portion 7a to the bearing 7b portion was curved to form a space, and the speed increaser 4 was formed in the space. Is accommodated, and the speed increaser 4 itself is compact, and the edges 2a and 2b of the axle frame connecting frame 2 can be used for the disc 51 and the input unit 55 of the rear axle 50 of the tractor. This is because the swing shaft 6 is mounted at the lowest position of the track frame 1 by arranging the input shafts 55a of the tracks) to be sandwiched therebetween and inclining the edges toward the body of the tractor.

Therefore, not only the semi-crawler can be compactly configured, but also soil and mud lumps are difficult to adhere to the speed increaser 4, the axle / frame connecting frame 2, and the track frame 1.

[Replacement with semi crawler]

Based on FIG. 10, the procedure to replace the rear wheel of a tractor with a semi crawler is demonstrated. FIG. 10 shows a replacement procedure for the left rear wheel 90, but the replacement is performed in the same order for the right rear wheel.

First, the tractor body 100 is jacked up, and as shown in FIG. 10 (a), the bolts of the tractor rear wheel 90 wheel are loosened so that the rear wheel 90 is the disk 51 of the axle 50. ) Next, as shown in FIG.10 (b), the flange part of the input shaft 55a of the input part 55 is attached to the disk 51 of the axle 50 using the removed bolt. Next, as shown in FIG.10 (c), the input shaft 55a is inserted in the through-hole of the gearwheel 55b of the gearbox 4 of the semi-crawler 20, and the female spline of the gearwheel 55b and The male spline of the input shaft 55a is engaged, and the input shaft 55a is fixed to the gear 55b with the loosening prevention bolt 55s.

Finally, as shown in FIG. 11, the edges 2a and 2b of the side surface of the axle frame connecting frame 2 are connected to the joint frame 250 via the joint bracket 230. As shown in FIG. For this reason, a pair of left and right semi crawlers can be stably mounted to the axle 50 of a rear wheel. When the fixing is completed, the jack up ends and lowers the tractor body 100. This is done.

According to the semi-crawler and the semi-crawler assembly mounted on the agricultural tractor according to the embodiment of the present invention described above, in the unitary structure before the change, the mounting bolt of the flange portion from which the tire is removed is negotiated with the gear case of the speed increaser. Although it was difficult to mount the bolts, the semi-crawler and semi-crawler assembly mounted on the agricultural tractor according to the embodiment of the present invention separated the input shaft of the speed increaser, so that only the input shaft could be first mounted alone before the speed increaser was mounted. In addition, although the outer diameter dimension of the tire mounting part of the agricultural tractor varies greatly depending on the manufacturer of each agricultural tractor, only the input shaft corresponding to the difference of each dimension needs to be prepared, thus eliminating the need to prepare a gearbox assembly for each manufacturer. The cost can be greatly reduced. In addition, by jointly mounting the joint frame on the body of the agricultural tractor body and the bogie axle on the left and right, and by providing a rotation angle control device of the mounting portion of the bogie shaft, the contact between the crawler device and the tractor body can be prevented. have.

[Other Embodiments]

In the above embodiment, the semi-crawler to be mounted on the agricultural tractor has been described. However, any vehicle that is intended to use a low grounding pressure of a semi-crawler such as a construction machine or a snow mobile or a strength of the traction force may be applied to any vehicle. Also the semi-crawler according to the present invention can be used. On the other hand, an automobile here means a vehicle which has a prime mover, rotates a wheel by the power, and runs on a road regardless of a track.

As mentioned above, although one Embodiment of the semi-crawler which concerns on this invention was described, this invention is not restrained by the embodiment, Addition, deletion, a change, etc. which a person skilled in the art can easily make are included in this invention, Furthermore, It is to be understood that the technical scope of the present invention is defined by the description of the appended claims.

1 track frame
2 axle frame connection frame
21 Top Connection
2a, 2b border
23 base part
4 gearbox
42, 44, 47 gear
45 gear case
5 sprocket shaft
50 rear wheel axle
6 rocking shaft
7 large diameter sprocket
8 front idler
9 rear idler
94 slider
95 guide rail
10 tensioner
10s coil spring device
10r load
11 track crawler
12 rubber crawler
20 semi crawler
24 swing bearing

Claims (2)

As a semi crawler which can be used for the agricultural tractor which can run by rotating at least the axle of a rear wheel by a drive means,
A large diameter sprocket having a toothed circumferential portion and a bearing portion fixed at the center of the output shaft,
An increaser for increasing the number of revolutions of the input shaft connected to the axle of the rear wheel of the agricultural tractor at a predetermined ratio and outputting the output shaft to the output shaft connected to a large diameter sprocket;
An axle-frame connecting frame for holding the speed increaser, having two edges spaced apart from each other, the speed reducer being disposed between the two edges, and one end of both of the two edges is connected to the speed reducer, An axle frame connecting frame having the other ends of both the two edges coupled to the swing shaft through a base portion;
A cylindrical rocking bearing portion for holding the front idler, the track crawler and the rear idler freely to rotate and freely holding the rocking shaft of the axle-frame connecting frame is fixed, and the rocking bearing portion is disposed near the rotating shaft of the track crawler. Track frame,
And a sprocket having a large diameter, and an infinite rail spanning the outer periphery of the front idler, the track crawler, and the rear idler held in the track frame,
The sprocket having the large diameter connects the toothed portion with the bearing portion of the output shaft of the large diameter sprocket to form a space, and within the space, the gearbox and the axle frame connection frame The two edges of the axle-frame connecting frame extend from the speed reducer accommodated in the space and are coupled to the swing shaft through the base portion, the swing shaft being cylindrical in shape of the track frame. It is rotatably inserted in the swing bearing part,
Within the full width of the infinite loop, the large diameter sprocket, the speed increaser, the axle frame connection frame and the track frame are accommodated,
A through hole is provided in the input gear shaft of the speed increaser, one end of the input shaft is inserted in the through hole, and a flange portion is provided at the other end of the input shaft, and the rear wheel of the agricultural tractor is provided in the flange portion. Semi-crawler can be used for agricultural tractors, characterized in that fixed the wheel disk of the axle. The method of claim 1,
In addition, a swing angle limiting device comprising a shock absorber of the spring case fixed to the axle frame connecting frame, and a stopper fixed to the track frame,
When the stopper presses the shock absorber of the spring case in response to the swing of the track frame, the shock absorber of the spring case limits the swing angle of the semi-crawler against the pressing force. Semi Crawler.

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