KR101541224B1

KR101541224B1 - Semi-crawler assembly for tractor

Info

Publication number: KR101541224B1
Application number: KR1020130156576A
Authority: KR
Inventors: 정삼석; 박형남; 강영선
Original assignee: 동양물산기업 주식회사
Priority date: 2013-12-16
Filing date: 2013-12-16
Publication date: 2015-08-04
Also published as: KR20150074223A

Abstract

The present invention provides a semi-crawler assembly capable of sufficiently securing the running performance of a tractor. The semi-crawler assembly includes a sprocket (100) rotatable by receiving power from a power source, an axle housing (200) supporting a drive shaft for rotating the sprocket, a plurality of wheels rotatably supported, And a rubber crawler 400 driven by rotation of the sprocket 100 and having a plurality of wheels and sprockets 100 disposed in a circumferential surface of the track frame 300 do. A support frame 510 rotatably supported at an upper portion of the track frame 300 and a damper 550 rotatably supported at an upper portion of the track frame 300 at a position spaced apart from the support frame 510 The upper end of the damper 550 is rotatably connected to one side of the upper portion of the support frame 510 and the upper end of the support frame 510 is connected to the axle housing.

Description

[0001] Semi-crawler assembly for tractor [0002]

The present invention relates to a semi-crawler assembly, and more particularly, to a semi-crawler assembly for a tractor, which can secure sufficient running performance even in mud through sufficient ground clearance and is constructed so as not to accumulate mud or the like.

The tractor can be classified into a wheel type (wheel type) and a crawler type (infinite orbit type) according to the traveling means. The tractor of the crawler type can be divided into a full crawler type that uses only the infinite orbit and a semi crawler type that uses the infinite orbit and the wheel together.

Such a wheel-type and crawler-type tractor can be widely used for cultivation, sowing, medium cultivation, weeding, harvesting and transportation in agricultural land such as wetlands and fields, but since the crawler type has a smaller earth pressure than the wheel type, It can be said that it is suitable for use in soft ground such as mud or the like which is not cleaned in the same work, and also in a work requiring a pulling force.

The following patent documents 1 and 2 describe a tractor capable of replacing a rear wheel of a wheel-type tractor with a crawler type. Patent Document 3 discloses a technique relating to a method of replacing a crawler in a tractor. Patent Document 4 describes a sprocket structure of a traveling crawler type traveling device. Patent Document 5 relates to a semi-crawler type tractor equipped with an accelerator, so that the front wheel of the tractor by the accelerator refers to the difference between the speed and the speed of the rubber crawler.

In the conventional semi-crawler type agricultural tractor described in Patent Documents 1 to 5, the rear wheel of the wheel-shaped tractor is separated and the crawler is attached to the rear wheel. However, replacement of the crawler requires a skilled technician to perform it and increases the cost. Therefore, there is a high demand for a semi-crawler type agricultural tractor in which a crawler can be mounted on the rear wheel of an existing agricultural tractor, but the semi-crawler can easily be detached and removed even if not an expert.

Therefore, the inventor of the present invention has studied a structure for attaching a crawler to the rear wheel of a conventional agricultural tractor and has tried a semi-crawler type agricultural tractor having a structure in which a crawler is attached to the rear wheel of a conventional agricultural tractor. Here, the semi-crawler-type tractor is difficult to travel repeatedly because of the fact that it has fallen into mud in a place where no agricultural land has been cleaned or in a wetland, and mud is piled up around the tractor roller. Therefore, it has been found that it is required to propose a semi-crawler type tractor in which mud is not accumulated around the frame and the running property is not lowered by an obstacle such as mud.

[Patent Literature]

Patent Document 1: JP-A-10-45052 (Publication Date: Feb. 17, 1998)

Patent Document 2: Japanese Patent Application Laid-Open No. 10-45060 (Publication Date: Feb. 17, 1998)

Patent Document 3 Japanese Patent No. 3155470 (Registered on Feb. 2, 2001)

Patent Document 4: Japanese Patent Publication No. 2003-276659 (published on October 10, 2003)

Patent Document 5 Japanese Patent No. 4883496 (Registered on February 22, 2012)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a semi-crawler type tractor with a lower ground level of a semi-crawler type tractor so that the semi-crawler type tractor does not fall into mud in a wetland.

Another object of the present invention is to provide a semi-crawler type tractor which can achieve light weight of a semi-crawler type tractor and prevent mud from being traced around parts constituting the crawler of the tractor.

In order to solve such a problem, a semi-crawler assembly according to the present invention includes: a sprocket rotatable by receiving power from a power source; An axle housing for supporting a drive shaft for rotating the sprocket; A track frame in which a plurality of wheels are rotatably supported and formed to have a constant length along the running direction; A rubber crawler driven by rotation of the sprocket and having a plurality of wheels and sprockets disposed therein; And a support means for supporting the track frame to the axle housing.

According to the embodiment of the present invention, the support means includes a support frame rotatably supported on the upper portion of the track frame, and a damper rotatably supported on the upper portion of the track frame at a position apart from the support frame An upper end portion of the damper is rotatably connected to one upper side of the support frame, and an upper end portion of the support frame is connected to the axle housing. According to a more specific embodiment, the support frame is connected to the axle housing through a housing connection provided at the upper end thereof.

According to another embodiment of the present invention, the support frame has an external connection part for connection with a stabilizer connected to a lower link behind the tractor.

According to another embodiment of the present invention, the plurality of wheels include a front wheel provided at the front lower portion of the rubber crawler, a rear wheel provided at the rear lower portion of the rubber crawler, and a plurality of idlers provided between the front wheel and the rear wheel .

According to another embodiment of the present invention, an upper portion of the track frame is formed with a mountain-shaped gradient, so that accumulation of mud can be sufficiently prevented. In a more specific embodiment, the track frame has a deformed I-beam shape and both sides of the lower portion of the gradient have inclined surfaces inclined downward.

According to another embodiment, the front wheel is provided at the lower end of a bracket rotatably supported at the tip of the track frame, and a damper is interposed between the bracket and the track frame.

According to another embodiment of the present invention, the front wheels, the rear wheels, and the plurality of idlers are supported at one side of the track frame.

According to another embodiment of the present invention, the track frame includes an intermediate portion supported by the idler, and a front portion and a rear portion inclined upward from the intermediate portion.

The tractor having the semi-crawler assembly according to the present invention having the above-described structure can increase the ground surface height of the lower portion of the substantially semi-crawler type tractor by connecting the left and right semi-crawler assemblies through the axle housing without directly connecting the semi- In the environment such as clay, the semi-crawler type tractor does not fall into the mud. This has the effect of preventing the driving performance from being deteriorated by the obstacle when the vehicle is actually running.

In addition, the semi-crawler assembly of the present invention can sufficiently prevent the accumulation of mud or the like on the track due to the formation of a gradient having a mountain shape on the upper part of the track frame, and the track frame basically has the shape of the I beam, A gradient is formed in the upper portion, so that it is expected that weight reduction can be achieved while maintaining the strength.

1 is a perspective view illustrating a semi-crawler assembly according to a preferred embodiment of the present invention.
2 is a side view showing a support means according to a preferred embodiment of the present invention;
3 is a plan view showing a support frame and a damper mounted on a track frame according to a preferred embodiment of the present invention.
4 is a plan view showing an external connection portion according to a preferred embodiment of the present invention.
5 is a side view showing a damper connected to a floating wheel bracket according to a preferred embodiment of the present invention;
6 is an enlarged view showing an I-beam shape in a track frame according to a preferred embodiment of the present invention;

Hereinafter, the semi-crawler assembly of the present invention will be described in detail with reference to the embodiments shown in the drawings. In the description of the present invention, the semicloller assembly refers to an assembly mounted on the rear side of a semi-crawler type tractor that travels by using a wheel and a crawler at the same time, which travels by a rotational force by a sprocket. It is also referred to as an assembly.

FIG. 1 schematically illustrates the overall structure of a semi-crawler assembly 1000 according to a preferred embodiment of the present invention, and FIGS. 2 through 4 illustrate the overall structure of each part of a semi-crawler assembly 1000 according to a preferred embodiment of the present invention. FIG.

1, according to an embodiment of the present invention, the semi-crawler assembly 1000 includes a sprocket 100 that receives a driving force from an engine and generates a rotational force for driving the tractor, A rubber crawler 400 coupled to the crawler 100 and driven to rotate, and a track frame 300 supporting the components inside the crawler as a whole.

The sprocket 100 operates as a driving source for traveling while being rotated by the power generated by the engine. For example, power from the engine is transmitted to the sprocket 100 through a power transmission shaft (not shown) provided inside the axle housing 200. The sprocket 100 includes a sprocket plate 110 having a disk shape and a sprocket 100 surrounding the outer circumferential surface of the sprocket plate 110 and having teeth on the outer circumferential surface to be engaged with a rubber crawler 400 100).

The semi-crawler assembly 1000 includes a track frame 300 formed along the front and rear in the running direction, and a plurality of wheels rotatably supported by the track frame 300. These wheels may include a front wheel 310 and a rear wheel 330, and a plurality of idlers 350. The front wheel 310, the rear wheel 330 and the idler 350 are supported by the track frame 300 in the interior of the rubber crawler 400 independently of the transmission of the power, So as to maintain the overall shape of the display device.

Referring to FIG. 5, a rear wheel 330 is rotatably supported at the rear end of the track frame 300, and a plurality of idlers 350 are rotatably supported at an intermediate portion of the track frame 300. . It can be seen that the idler 350 is composed of three in the illustrated embodiment. The front wheel 310 is supported on the track frame 300 through a bracket 600. [ That is, the bracket 600 is rotatably connected to the front end of the track frame 300, and the front wheel 310 is rotatably mounted to the lower end of the bracket 600.

As shown in FIG. 3, in this embodiment, five wheels are supported at one side of the track frame 300, and are disposed so as to protrude outward from the track frame 300. Therefore, in the embodiment of the present invention, mud deposited on the wheel like a conventional semi-crawler type tractor is not accumulated in the space between the wheel and the track frame, so that mud can be prevented from adhering to the wheel.

The structure of the track frame 300 includes a front portion, a middle portion, and a rear portion, and the front portion is inclined upward at a relatively large angle with respect to the middle portion. The rear portion is inclined upward at a relatively small angle with respect to the intermediate portion. The track frame 300 is formed with a hole for installing three idlers 350 in the middle and a front wheel 310 and a rear wheel 330 are fixed to the track frame 300 in front and rear, And is rotatably installed by being supported by pins through these holes.

A damper 700 is installed between the bracket 600 and the track frame 300 to support the front wheel 310 at an end thereof to absorb an impact during driving. One end of the damper 700 is connected to an intermediate portion of the bracket 600 and the other end of the damper 700 is connected to a damper supporting portion 303 protruding upward from the track frame 300, Any of these dampers can be used as long as they are capable of absorbing the impact, and it is also possible to constitute the damper with a cylinder and a piston having an impact absorbing function by air or oil.

When the bracket 600 is rotated with respect to the track frame 300 by the front wheel 310 that is in contact with the road surface during traveling, the damper 700 may be stretched or compressed to absorb the shock. The damper 700 functions to attenuate the impact applied to the front wheel 310 and also functions to maintain the tension of the rubber crawler 400 and prevent the rubber crawler 400 from loosening . The damper 700 can adjust the compression amount of the spring and adjust the tension of the rubber crawler 400 by rotating the screw provided inside.

The rubber crawler 400 is driven by the rotation of the sprocket 100 and is in contact with the ground. A hole or groove to which the teeth of the sprocket 100 are engaged is formed in a row along the inner circumference of the circumference. And the outer circumferential surface of the circumference is formed with a row of protrusions along the circumferential direction.

The three idlers 350 arranged in the center of the rubber crawler 300 maintain the orbit and contact the ground surface such as agricultural land or the like but a portion engaged with the front wheel 310 and the rear wheel 330 floats on the ground surface . In more detail, the rubber crawler 400 is tilted so that the portions of the rubber crawler 400 that are in contact with the front wheel 310 and the rear wheel 330 are lifted upward.

That is, a predetermined portion of the upper side of the rubber crawler 400 on which the ground surface is grounded is raised to facilitate the operation of the steering apparatus. And particularly facilitates operation of the steering device for changing the traveling direction of the tractor when the tractor vehicle body is advancing. Therefore, the rubber crawler 400 can reduce the turning radius and improve the turning performance.

Since the portion of the rubber crawler 400 that is in contact with the three idlers 350 in the wetland is almost locked, a predetermined portion of the rubber crawler 400 that is grounded on the ground surface is lifted by the front wheel 310 and the rear wheel 330 This makes it possible to further distribute the contact pressure of the rubber crawler 400.

Next, a structure for supporting the semi-crawler assembly of the present invention having the above-described structure on the tractor body will be described with reference to FIGS. 1 to 6. FIG. First, the semi-crawler assembly 1000 according to the present invention is attached to and supported by the above-described axle housing 200 (see Fig. 1). That is, the semi-crawler assembly 1000 and the axle housing 200 are connected and supported by the support means 500.

The support means 500 in the illustrated embodiment includes a support frame 510 rotatably connected at an intermediate portion of the track frame 300 and a track frame 300 And a damper 550 rotatably connected to the damper 550. The support frame 510 and the damper 550 are installed substantially upward in the track frame 300 and the upper ends of the damper 550 and the support frame 510 are rotatably connected to each other.

The support frame 510 is rotatably connected to a frame connecting portion 502 extending upward in the track frame 300 and the damper 550 is also connected to a damper And is rotatably connected to the connection portion 511. The upper end of the support frame 510 is provided with a housing connection part 512 to be connected to the axle housing 200 (see FIG. 1). The housing connection part 512 preferably has a shape that can be more stably connected to the axle housing 200, and may be formed into a plate shape as shown in, for example, FIG.

The support frame 510 and the damper 550 are connected to each other at an upper end thereof. In the illustrated embodiment, a damper connection portion 514 is formed on the back surface of the housing connection portion 512 formed at the upper end of the support frame 510 and connected to the upper end portion of the damper 550 through the damper connection portion 514 . It can be seen that the track frame 300 is supported substantially under the axle housing 200 through the support frame 510 and the damper 550 as described above. Can be absorbed.

As described above, according to the present invention, since it is connected to the axle housing through the support frame 510, more specifically, through the housing connection portion 512 provided at the upper end of the support frame 510, The connection frame for connecting the frames 300 to each other is unnecessary and is fixed at a position coinciding with the shaft center line so that the left and right track frames 300 are balanced. Therefore, it can be understood that the support means 500 according to the present invention directly connects the track frame 300 to the axle housing 200 without using a separate member.

According to such a connection structure, it is expected that obstacles such as mud in a wetland can not be prevented from interfering with the connection frame because the structure is simplified and the ground surface height is increased. The supporting means 500 also stably fixes the left and right track frames 300 and keeps the equilibrium so that the five idler wheels 350, the five wheels constituted by the front wheels 310 and the rear wheels 330, Let them drive.

The support frame 510 protrudes upward from the left and right upper ends of the track frame 300, so that the support frame 510 does not protrude to the inside of the rubber crawler 400, so that interference with an obstacle can be minimized. The support frame 510 protrudes upward from the left and right upper ends of the track frame 300 so that a space is formed under the transmission of the semi-crawler type tractor so that the ground height of the lower part of the semi crawler type tractor is increased.

The structure of the damper 550 is not shown, but it is needless to say that it is possible to use various well-known dampers capable of attenuating impact, and it may be constituted by a plurality of springs connected in parallel or in series, .

The support frame 510 is provided with an external connection part 531 to which a separate mechanism can be connected and fixed. In the illustrated embodiment, the external connection part 531 is further provided with an external connection part 531 protruding from the back surface of the housing connection part 512 and formed with a hole to be fixed by a pin. The distal end of the stay bilayer 800 is fixed to the external connection portion 531.

Here, the stabilizer 800 itself is currently mounted on the tractor, and a detailed description thereof will be omitted. Briefly, in general, one tower link (not shown) and a pair of lower links are provided at the rear of the tractor for attaching different agricultural equipment so that the other attachment can be transported at three points As shown in FIG. 1 and 4 show a lower link 820 on one side of a pair of lower links.

The stabilizer 800 can be said to be installed on the tractor in order to more stably support the lower link 820. In fact, the stabilizer 800 has a symmetrical structure with respect to a pair of lower links 820 disposed on the left and right, do. According to the present invention, the rear end portion of the stabilizer 800 is connected to the lower link 820, and the distal end portion is connected to and fixed to the external connection portion 531. 4, the stirrer 800 is connected to the external connection part 531 through a pin.

6 is an enlarged view showing an I-beam shape of a track frame according to a preferred embodiment of the present invention. As shown, the track frame 300 of the present invention has a modified I-beam cross-section and an upper portion thereof is formed with a mountain-shaped gradient 301. That is, the track frame 300 has a shape in which the upper surface of the track frame 300 is convexly protruded upward. Therefore, the track frame 300 is maintained so that the mud is not accumulated well while maintaining the strength. In addition, a slope 302 inclined downward toward the outside is formed in the lower portion of the track frame 300. It is natural that the inclined surface 302 also has a function of preventing the clay from accumulating substantially.

The present invention has been described above with reference to the embodiments shown in the drawings. It will be understood by those skilled in the art that various other changes in form and details may be made therein without departing from the scope of the present invention as defined by the appended claims .

100: Sprocket 110: Sprocket plate
120: Sprocket tooth profile 200: Axle housing
300: track frame 301: gradient
302: inclined surface 303: damper support
310: front wheel 330: rear wheel
350: Idler 400: Rubber crawler
500: support means 502: frame connection
510: support frame 512: housing connection
514: Damper connection part 531: External connection part
550: damper 600: floating wheel bracket
700: damper 800: stay bill riser
820:

Claims

A rotatable sprocket (100) receiving power from a power source;
An axle housing 200 supporting a drive shaft for rotating the sprocket 100;
A track frame (300) rotatably supported by a plurality of wheels and having a predetermined length along the running direction;
A rubber crawler 400 driven by rotation of the sprocket 100 and having a plurality of wheels and sprockets disposed therein;
A support frame 510 rotatably supported on an upper portion of the frame connection portion 502 extending upward in the track frame 300; And
And a damper 550 rotatably supported on an upper portion of a damper connecting portion 511 extending upward from the track frame 300 at a position spaced apart from the support frame 510;
The support frame 510 is connected to the axle housing 200 through a housing connection part 512 provided at an upper end thereof and connected to the damper 550 through a damper connection part 514 on the rear surface of the housing connection part 512 Connected;
The upper end of the damper 550 and the upper end of the support frame 510 are connected to the upper end of the damper 550 through the housing connecting portion 514, (200). &Lt; / RTI >

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The semi-crawler assembly of claim 1, wherein the support frame (510) has an external connection (531) for connection with a stabilizer (800) connected to a lower link (820) behind the tractor.

The vehicle wheel according to claim 1 or 4, wherein the plurality of wheels comprise: a front wheel (310) provided at a front lower portion of the rubber crawler (400); a rear wheel (330) installed at a rear lower portion of the rubber crawler And a plurality of idlers (350) installed between the front wheel (310) and the rear wheel (330).

5. The semi-crawler assembly of claim 1 or 4, wherein a top of the track frame (300) is formed with a mountain-like gradient (301).

The track frame (300) according to claim 5, wherein the front wheel (310) is provided at a lower end of a bracket (600) rotatably supported at the tip of the track frame (300) A semi-crawler assembly with a damper (700) interposed therebetween.

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6. The semi-crawler assembly of claim 5, wherein the track frame (300) includes an intermediate portion (50) on which the idler (350) is supported, and a forward portion and a rear portion inclined upwardly in the intermediate portion.

7. The semi-crawler assembly of claim 6, wherein the track frame (300) has an I-beam shape and the slope (302) is inclined downwardly on both sides of the lower portion of the gradient (301).