Tractor PTO coupling device

Abstract

To provide a PTO coupling device for a tractor that enables quick connection of coupling sections provided for transmitting PTO power to a working machine at the rear of the tractor. [Solution] The first coupling part has a disk-shaped storage part with a storage space formed inside, and one or more openings are formed in the front part of the storage part to communicate with the storage space, and a PTO connecting part that is connected to the PTO shaft of the tractor is fixed to the rear part of the storage part, and the second coupling part is formed to be inserted into the opening and has one or more insertion members that are inserted into the storage space through the opening, and a power transmission connecting part that is connected to the power transmission shaft of the work machine is fixed to the rear part of the insertion member, and the storage space is designed to accommodate the insertion member inserted through the opening by rotating in a lateral direction, and a rotation prevention stopper is provided in the storage space that contacts the side part of the insertion member to transmit power while limiting rotation.

Description

[Technical Field]

[0001] The present invention relates to a power take-off (PTO) coupling device for a tractor, and more particularly to a PTO coupling device for a tractor that enables quick connection (D) between coupling parts provided to transmit PTO power to a work implement at the rear of the tractor.

[0002] The present invention also relates to a PTO coupling device for a tractor that is easy to manufacture and can significantly reduce manufacturing costs by directly connecting and fixing a first coupling part to the PTO shaft in order to transmit PTO power to a work implement behind the tractor, and by fixing a second coupling part integrally to a universal joint that is connected to the power transmission shaft of the work implement. [Background technology]

[0003] Generally, tractors are used to cultivate large areas of rice paddies and other fields. Most of these tractors have implements such as plows, harrows, and rotavators attached to the rear of the tractor, and the tractor is operated to perform various agricultural tasks such as tilling, harrowing, pest control, water pumping, and threshing. These implements connected to the tractor are operated by power generated by the tractor's engine, transmitted via the PTO.

[0004] Therefore, the PTO shaft of the tractor and the power input shaft of the work machine are coupled to each other to transmit power, and in the following Patent Document 1, which is an example of such a coupling device, as shown in Figures 1 and 2, a receiver 207 having a connection hole 205 into which the PTO shaft of the tractor is inserted and fixed by gear engagement is provided in the center of the rear surface of a disk-shaped first plate 209, and the first plate 209 has a plurality of openings 210a formed at equal intervals around the periphery of the receiver 207, and further, small openings 210b having a diameter smaller than the diameter of the openings 210a are formed continuously on the side of each opening 210a. A connector 213 to be inserted into the opening 210a is formed on the front surface of a disk-shaped second plate 211 so as to face the opening 210a, and this connector 213 has a T-shaped cross section.

[0005] That is, the connector 213 comprises a cylindrical connector shaft 213b and a disk-shaped connector top (connector top) 213a formed at the upper end of the connector shaft 213b with a larger diameter than the connector shaft 213b, and the diameter of the connector top 213a is smaller than the diameter of the opening hole 210a and larger than the diameter of the small opening hole 210b.

[0006] In addition, a shaft 223 for connecting to the power transmission shaft of the work machine is formed at the center of the rear surface of the second plate 211, and gear teeth 402 are formed on the outer circumferential surface of the shaft 223 to be gear-coupled to the power connecting shaft of the work machine.

[0007] Therefore, each connector 213 of the second plate 211 is fitted into the opening hole 210a of the first plate 209, and then rotated in the direction of the small opening hole 210b to couple the connector 213 so that it does not come off the opening hole 210a. After that, a locking shear pin 215 is passed through the through holes 216 formed in the first plate 209 and the second plate 211 to fasten them together, thereby fixing the first plate 209 and the second plate 211 to each other and transmitting the power of the PTO to the power shaft of the work machine.

[0008] However, in such conventional technology, the multiple connectors 213 must be individually fitted into the opening holes 210a, and then the second plate 211 must be rotated by the worker to engage the multiple connectors 213, and the task of individually aligning and inserting the multiple connectors 213 into the opening holes 210a is not very easy.

[0009] That is, while the prior art claims to enable quick connection of the PTO, it has the inconvenience of having to pull and move the second plate 211 in the direction of the first plate 209 fixed to the PTO shaft while individually fitting the multiple connectors 213 into the opening holes 210a, and since the second plate 211 must be rotated in the direction of the small opening hole 210b, it is not very easy to fasten the first plate 209 and the second plate 211 together, which reduces workability.

[0010] Furthermore, when the connector 213 is rotated in the direction of the opening hole 210a to separate the second plate 211 from the first plate 209, the connector shaft 213b abuts against the inner wall of the opening hole 210a, while the connector top 213a gets caught on the outer part of the opening hole 210a, making removal (detachment) difficult.

[0011] Therefore, the connector top 213a can be removed from the opening hole 210a only by aligning the connector top 213a with the opening hole 210a, thereby separating the first plate 209 and the second plate 211. However, in this case, there is a disadvantage in that it is difficult to quickly separate the first plate 209 and the second plate 211.

[0012] Furthermore, when power is transmitted by inserting the connector 213 of the second plate 211 into the small opening 210b through the opening 210a of the first plate 209, there is a drawback in that if a large or instantaneous power is applied, the cylindrical connector shaft 213b may be damaged, such as bent or broken.

[0013] Furthermore, in order to connect with the universal joint provided on the power transmission shaft of the work machine, gear teeth 402 must be formed on the outer peripheral surface of the shaft 223 of the second plate 211, which not only increases manufacturing costs due to the processing of the gear teeth 402, but also reduces productivity. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] U.S. Patent No. 11,313,417 (TRACTOR PTO QUICK-CONNECT DEVICE AND METHOD OF USE) Summary of the Invention [Problem to be solved by the invention]

[0015] The present invention has been made to solve these conventional problems, and aims to provide a PTO coupling device for a tractor that enables quicker and more convenient coupling by fastening a coupling part connected to a PTO and a coupling part connected to a power transmission shaft of a work implement using a simple storage method.

[0016] Another object of the present invention is to provide a PTO coupling device for a tractor that can be quickly connected as well as quickly and easily disconnected by fitting the coupling part, which is provided to transmit the power of the PTO to the implement at the rear of the tractor, and then rotating and fixing it.

[0017] Yet another object of the present invention is to provide a PTO coupling device for a tractor in which a first coupling portion is directly connected and fixed to the PTO shaft, and a second coupling portion is integrally fixed to a universal joint connected to the power transmission shaft of the work implement. [Means for solving the problem]

[0018] To achieve the above object, one embodiment of the present invention provides a PTO coupling device for a tractor, comprising: a first coupling part connected to a PTO shaft of a tractor to transmit power; and a second coupling part detachably coupled to the first coupling part and connected to a power transmission shaft of a work implement to provide the power transmitted from the first coupling part to the work implement, wherein the first coupling part includes a box-shaped storage part that is open at the top and has a storage space formed therein; and a PTO connector part that is fixed to a rear surface of the storage part and is connected to the PTO shaft of the tractor; and the second coupling part includes an insertion member that has a size and shape to be stored in the storage part and is inserted into the storage part; and a power transmission connector part that is fixed to the rear surface of the insertion member and is connected to the power transmission shaft of the work implement.

[0019] In addition, a PTO coupling device for a tractor according to another embodiment of the present invention includes a first coupling part connected to a PTO shaft of the tractor to transmit power, and a second coupling part detachably coupled to the first coupling part and connected to a power transmission shaft of a work implement to provide the power transmitted from the first coupling part to the work implement, wherein the first coupling part has a disk-shaped storage part having a storage space formed therein, and one or more openings are formed in a front part of the storage part to communicate with the storage space, and a rear part of the storage part has a a PTO coupling part to be coupled to the PTO shaft of the tractor is fixed, the second coupling part is formed to be inserted into the opening and has one or more insertion members to be inserted into the storage space through the opening, a power transmission coupling part to be connected to the power transmission shaft of the work machine is fixed to a rear surface part of the insertion member, the storage space is configured to accommodate the insertion member inserted through the opening by rotating in a lateral direction, and the storage space is provided with a rotation prevention stopper that contacts the side surface of the insertion member to transmit power while restricting rotation.

[0020] Furthermore, a PTO coupling device for a tractor according to yet another embodiment of the present invention is characterized in that it comprises: a first coupling part having a rear part integrally formed with a PTO connecting part for coupling with a PTO shaft to transmit power; and a second coupling part detachably coupled to the first coupling part to transmit power, the second coupling part having a universal joint integrally fixed to its rear part and having a shaft connecting part for connecting to a power transmission shaft of a work machine. [Effects of the Invention]

[0021] In one embodiment of the tractor PTO coupling device of the present invention configured in this manner, the second coupling part fixed to the power transmission shaft of the work implement can be simply inserted into the box-shaped first coupling part fixed to the PTO shaft of the tractor, and can be quickly detached, making the work implement coupling extremely easy and providing the advantage of excellent workability.

[0022] In addition, since the second coupling part is guided and inserted along the tapered inclined surface of the first coupling part, there is an advantage that the coupling work between the first coupling part and the second coupling part can be performed extremely easily even if the worker does not fit them together accurately.

[0023] Furthermore, according to another embodiment of the present invention, by fitting the second coupling part fixed to the power transmission shaft of the work implement into the first coupling part fixed to the PTO shaft of the tractor, and then rotating and fixing them, not only can they be quickly coupled but they can also be quickly separated, and power can be transmitted by bringing the first coupling part and the second coupling part into contact over a wide area, which has the advantage of preventing damage due to large or sudden power.

[0024] Furthermore, according to yet another embodiment of the present invention, by directly connecting and fixing the first coupling unit to the PTO shaft of the tractor with a pin, and directly connecting and fixing the second coupling unit to a universal joint provided on the power transmission shaft of the work machine, gear teeth are not required at least at the part where the second coupling unit and the universal joint are connected, which has the advantage of reducing manufacturing costs and improving productivity. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram showing the structure of a PTO coupling device according to the prior art. [Figure 2] 1 is a diagram showing the structure of a PTO coupling device according to the prior art. [Figure 3] 1 is a diagram showing the structure of a PTO coupling device of a tractor according to the present invention. [Figure 4] FIG. 4 is a combined cross-sectional view of FIG. 3. [Figure 5] 4 is a detailed structural diagram of a first coupling portion and a second coupling portion. FIG. [Figure 6] FIG. 6 is a combined view of FIG. 5. [Figure 7] FIG. 7 is a combined cross-sectional view of FIG. [Figure 8] 10A and 10B are diagrams showing other configurations of the first coupling portion. [Figure 9] 10A and 10B are views showing other embodiments of the first coupling portion and the second coupling portion. [Figure 10] FIG. 10 is a diagram showing the coupled state of FIG. 9. [Figure 11] 10 is a diagram for explaining the internal structure of the first coupling portion of FIG. 9. FIG. [Figure 12] 10 is a cross-sectional view of the coupling between the first coupling part and the second coupling part of FIG. 9. FIG. [Figure 13] 10A and 10B are diagrams showing still another embodiment of the first coupling portion and the second coupling portion. [Figure 14] 10A and 10B are diagrams showing still another embodiment of the first coupling portion and the second coupling portion. [Figure 15]10A and 10B are diagrams showing still another embodiment of the first coupling portion and the second coupling portion. [Figure 16] 10A and 10B are diagrams showing still another embodiment of the first coupling portion and the second coupling portion. [Figure 17] FIG. 10 is a view showing the structure of a PTO coupling device of a tractor to which still another embodiment of the first coupling portion and the second coupling portion of the present invention is applied. DETAILED DESCRIPTION OF THE INVENTION

[0026] The above-mentioned objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the technical concept of the present invention. When describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms used in the present invention are currently commonly used and general terms selected as much as possible while taking into consideration the functions of the present invention. However, these terms may change depending on the intentions of engineers in the field, precedents, the emergence of new technologies, etc. In addition, in certain cases, the applicant may arbitrarily select terms, and in such cases, their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in the present invention are defined not simply by their names, but based on the meanings of the terms and the overall content of the present invention.

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] However, the following exemplary embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

[0029] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

[0030] FIG. 3 is a diagram showing the exploded structure of the PTO coupling device for a tractor according to the present invention. As shown in the figure, the PTO coupling device for a tractor comprises a first coupling part 300, the rear part of which is integrally formed with a PTO connecting part 370 for coupling with a PTO shaft 800, to transmit power, and a second coupling part 400, which is detachably coupled to the first coupling part 300 to transmit power, and to which a universal joint 600 having a shaft connecting part 610 for connecting to a power transmission shaft 900 of a work machine is fixed integrally at its rear.

[0031] The first coupling part 300 can be quickly fastened to the second coupling part 400 by a fitting structure that fits with it, and a PTO connecting part 370 is integrally formed on the rear surface (back surface) of the first coupling part 300 by welding or the like, and the PTO connecting part 370 is a tubular body having a structure in which the PTO shaft 800 is inserted inside and fastened.

[0032] In this case, the fastening structure may have various types of fastening structures other than a structure in which the fastening structure is fixed or fastened by a spring pin or a bolt.

[0033] One side of a universal joint 600 connected to a power transmission shaft 900 of the work machine is fixed integrally to the rear portion of the second coupling portion 400 via a power transmission connecting portion 440, and the other side of the universal joint 600 is integrally provided with a shaft connecting portion 610 into which the power transmission shaft 900 of the work machine is inserted and which meshes with gear teeth 630.

[0034] At this time, the power transmission connecting part 440 may be formed as a single body with the second coupling part 400, or may be formed integrally with the second coupling part 400 by various fastening methods such as welding, pins, bolts, etc.

[0035] The power transmission connecting portion 440 may have a structure in which gear teeth are formed on the outer periphery in accordance with the shape of the power transmission shaft 900 .

[0036] Therefore, as shown in Figure 4, a PTO shaft 800 is inserted into the PTO connection portion 370 of the first coupling part 300, and a pin or bolt or the like is inserted into the pin hole 371 to connect and fix them, and a power transmission shaft 900 of the work implement is inserted into the shaft connection portion 610 of the second coupling part 400 and meshed with it, so that when the second coupling part 400 is connected to the first coupling part 300, the power of the tractor is transmitted to the work implement.

[0037] By using this structure, the power transmission structure can be quickly attached and detached to the PTO using the first coupling part 300 and the second coupling part 400, and some gear teeth are no longer necessary, making manufacturing easier and reducing manufacturing costs.

[0038] That is, the present invention has a structure in which gear teeth 620 are formed only on shaft connection portion 610 of universal joint 600, whereas the prior art structure requires gear teeth 205 to be formed on first plate 209, gear teeth 402 to be formed on the outer peripheral surface of shaft 223 of second plate 211, and gear teeth to be formed on the universal joint to which shaft 223 is connected, which requires processing steps for three gear teeth.

[0039] Here, it goes without saying that the first coupling portion 300 and the second coupling portion 400 may be replaced with the first coupling portion 300 and the second coupling portion 400 shown in FIG.

[0040] Figures 5 to 8 are diagrams showing one embodiment of the first coupling unit 400 and the second coupling unit 400. As shown in these figures, the first coupling unit 300 has a box-shaped storage section 310, and a PTO connecting section 370 for connecting to the PTO shaft of a tractor is fixed to the rear surface of the storage section 310. This PTO connecting section 370 has a structure in which the PTO shaft of an existing tractor is inserted, and then a connecting pin is inserted into a pin hole 371 and fastened, thereby connecting the PTO shaft and PTO connecting section 370 and transmitting power.

[0041] Of course, the PTO shaft and the PTO connecting portion 370 may be fixed using not only pins but also bolts or the like, and various methods such as pin fastening or bolt fastening can be used.

[0042] Furthermore, it is preferable that the PTO connecting portion 370 be disposed in the center of the rear surface of the storage portion 310, but this is not limited to the center and it may be fixedly disposed in any position.

[0043] The storage section 310 is box-shaped with a storage space 311 inside and an upper opening 320 that is open at the top, and is composed of a rear panel (back panel) to which the PTO connection section 370 is fixed, a front panel located forward from the rear panel by the amount of the storage space 311, side walls that form both sides between the rear panel and the front panel, and a bottom panel.

[0044] The second coupling part 400 has a size and shape that allows it to be inserted into the receiving space 311 of the first coupling part 300 so as to fit snugly therein, and the inserting member 410 has a size and shape that corresponds to the width and length of the receiving space 311 and a thickness equal to the spacing between the rear panel and front panel of the receiving space 311.

[0045] In addition, a power transmission connection part 440 is fixed to the rear surface of the insert member 410 for connection to the power transmission shaft of the work machine via a universal joint. This power transmission connection part 440 has gear teeth formed along its outer circumferential surface for insertion into one side of the universal joint and meshing therewith. When the insert member 410 is inserted and coupled into the storage part 310, this power transmission connection part 440 is preferably positioned in a straight line with the PTO connection part 370, but does not necessarily have to be positioned in a straight line.

[0046] That is, since a universal joint is provided on the power transmission shaft of the work machine, power can be transmitted even if the PTO connection part 370 and the power transmission connection part 440 are not necessarily positioned on a straight line.

[0047] Therefore, when the insertion member 410 of the second coupling part 400 is lifted upward and its lower part is inserted from above through the open upper opening 320 of the storage part 310, the insertion member 410 naturally descends into the interior of the storage part 310 due to its own weight, and the insertion member 410 fits snugly inside the storage part 310, and the storage part 310 and the insertion member 410 are locked together by the lock pin 380.

[0048] For this purpose, pin fixing holes 360 and 430 are formed at corresponding positions on the storage section 310 and the insert member 410, respectively, and as shown in FIG. 6, when the insert member 410 is stored in the storage section 310, a lock pin 380 can be inserted into the pin fixing holes 360 and 430 to fasten them together.

[0049] Also, the lock pin 380 may be provided separately and may be fixed to the receiving part 310 as shown in FIGS.

[0050] For this purpose, the lock pin 380 has a straight tubular fixing portion 381 fixed to the outside of one side wall portion of the storage portion 310 by welding or the like, a pin 382 inserted into the fixing portion 381, a stopper 384 provided on one side of the pin 382, ​​a spring 383 fitted on the outer periphery of the pin 382 between the stopper 384 and the fixing portion 381 to elastically support the pin 382, ​​and the other side of the pin 382 is bent in the direction of the pin fixing holes 360, 430.

[0051] Therefore, after inserting the insert member 410 into the storage section 310 and aligning the pin fixing holes 360, 430 with each other, the other side of the pin 382 is pulled and the bent portion is rotated toward the pin fixing holes 360, 430 and inserted. As shown in FIG. 7, the elastic support force of the spring 383 allows the bent portion of the pin 382 to remain inserted into the pin fixing holes 360, 430. This fixes the storage section 310 and the insert member 410 together and prevents them from coming apart when rotated under power, making it very easy to achieve coupling between the storage section 310 and the insert member 410.

[0052] As a result, the storage section 310 rotates due to the rotation of the PTO shaft, and this rotational force is transmitted to the insertion member 410, and then transmitted via the power transmission coupling section 440 to the power transmission shaft of the work machine.

[0053] When separating the insert member 410 from the storage section 310, the pin 382 is pulled, rotated in the lateral direction of the storage section 310, and the insert member 410 is lifted up, whereby the insertion member 410 can be separated very easily.

[0054] On the other hand, in order to make it easier to insert the insertion member 410 into the storage section 310, it is preferable that the side walls of the storage space 311 are formed with inclined portions 330, 330' having a tapered shape that narrows toward the bottom, and it is also preferable that the insertion member 410 is formed with corresponding inclined portions 420, 420' having a tapered shape that narrows toward the bottom.

[0055] Therefore, when the narrow lower portion of the insert member 410 is inserted into the upper portion of the receiving portion 310 through the wider upper opening 320, the insert member 410 is guided by the inclined portions 330, 330' of the receiving portion 310, ensuring accurate coupling.

[0056] In this case, a front opening 340 is formed on the front portion of the storage section 310, with a portion of the front opening being open to the top, i.e., the top opening 320, and it is desirable that when the insertion member 410 is inserted, the power transmission connection section 440 is inserted through the front opening 340.

[0057] The bottom portion is formed with a lower opening 351, which is an opening in part of the bottom portion 350, in order to discharge foreign matter such as soil, water, straw, grass, etc. that has entered the storage space 311 to the outside. This bottom portion 350 is in the form of a stopper that distributes the weight applied to the inclined portions 330, 330' when the insertion member 410 is inserted into the storage portion 310, thereby preventing damage to the storage portion 310 and accurately aligning the pin fixing holes 360, 430.

[0058] In addition, the inclined portions 330, 330' and 420, 420' are preferably formed on both side surfaces of the receiving portion 310 and the inserting member 410, respectively, but may be formed on only one side.

[0059] That is, the insert member 410 may have any shape such that the width of the lower portion of the insert member 410 is smaller than the width of the open upper portion of the storage space 311 .

[0060] TIFF0007759133000002.tif20166

[0061] Furthermore, although the storage section 310 is illustrated and described as having a plate shape with a storage space 311 formed therein, it may have various three-dimensional shapes, such as a hemisphere with an open top, a triangular pyramid with an open top, or the like, in addition to a simple plate shape.

[0062] Figure 8 shows another form of storage section 310, which has a structure in which anti-detachment protrusions 341 are formed by extending inward from above the front part of the side of storage section 310, and a front opening 340 is formed between the anti-detachment protrusions 341 on both sides.

[0063] Of course, such anti-detachment protrusion 341 may, in some cases, further have a structure extending inward from the front part of the bottom, and it is preferable that the anti-detachment protrusion 341 is formed so that both side edges, or both side edges and the lower edge, are caught when the insertion member 410 is inserted into the storage section 3100.

[0064] Therefore, the insert member 410 can be stored in the storage space 311 through the front opening 340 by simply lifting the insert member 410 slightly, without having to lift the insert member 410 so that the lower part of the insert member 410 is positioned higher than the upper part of the storage section 310.

[0065] This is because, when a structure is located above the PTO shaft of the tractor, if the insert member 410 is lifted above the storage section 310, interference may occur between the structure and the insert member 410, making it impossible to store it. However, the different shape of the storage section 310 according to the present invention makes it possible to couple with the storage section 310 while avoiding interference with other structures.

[0066] Furthermore, a pin fixing hole 360 ​​can be formed in the separation prevention protrusion 341 to fasten the storage portion 310 and the insertion member 410 together.

[0067] 9 to 12 are views showing other embodiments of the first coupling part 300 and the second coupling part 400. As shown in these figures, the first coupling part 300 has a disk-shaped storage part 310 having a storage space 311 formed therein. The storage part 310 includes a disk-shaped rear panel, a disk-shaped front panel spaced apart from the rear panel and positioned at the front, and side panels positioned along the outer peripheries of the rear panel and the front panel to secure the rear panel and the front panel together, and the storage space 311 is formed between the rear panel and the front panel inside.

[0068] A PTO connecting part 370 for connecting to the PTO shaft of a tractor is fixed to the rear part of the storage part 310. The PTO connecting part 370 has a structure in which the PTO shaft of an existing tractor is inserted and then a connecting pin is inserted into a pin hole 371 and fastened, thereby connecting the PTO shaft and the PTO connecting part 370 and transmitting power.

[0069] Of course, the PTO shaft and PTO connecting portion 370 may be fixed using not only pins but also bolts or the like, and various methods such as pin fastening or bolt fastening can be used.

[0070] A plurality of openings 340 are formed radially at regular intervals on the front surface of the storage section 310, i.e., the front panel, and the openings 340 have a shape in which the opening width increases in the direction from the center of the front surface to the outside, and the plurality of openings 340 are connected to each other in the center of the storage section 310.

[0071] As shown in FIG. 11, the storage space 311 is provided with a rotation prevention stopper 312 formed on the side of the opening 340, preferably in the opposite direction to the rotation direction of the storage section 310, and this rotation prevention stopper 312 is preferably located close to an adjacent opening or between adjacent openings.

[0072] That is, in the storage space 311 between the openings, stopper-type anti-rotation stoppers 312 are formed at the same positions to restrict the rotation of the insertion member 450 of the second coupling part 400 while transmitting power through surface contact.

[0073] Most preferably, the openings 340 and the storage spaces between the openings have the same size and shape as the insert members 450, and the anti-rotation stoppers 312 are formed on the side portions of the adjacent openings, i.e., on one of the side portions facing the direction in which the storage members 310 rotate, so that the storage spaces 311 are connected to the other side portion of the openings 340, and the insert members 450 inserted into the openings 340 rotate in the side direction and are stored in the storage spaces 311 between the openings.

[0074] The rotation prevention stopper 312 preferably has the same shape as the side surface of the insert member 450 to maximize the contact area.

[0075] The second coupling part 400 includes a plurality of insertion members 450 that can be inserted into the receiving space 311 through the opening 340 of the first coupling part 300 .

[0076] That is, the second coupling portion 400 is provided with a plurality of blade-shaped insert members 450 spaced apart radially so as to be inserted into the respective openings 340, and a power transmission connecting portion 440 is fixed to the rear surface of the insert member 450 for connecting to a power transmission shaft of a work machine via a universal joint. The power transmission connecting portion 440 has gear teeth formed along its outer circumferential surface to be inserted into one side of the universal joint and engage with it. When the insert member 410 is inserted and coupled into the storage portion 310, it is desirable, but not necessary, that the power transmission connecting portion 440 be positioned in a straight line with the PTO connecting portion 370.

[0077] That is, since a universal joint is provided on the power transmission shaft of the work machine, power can be transmitted even if the PTO connection part 370 and the power transmission connection part 440 are not necessarily positioned on a straight line.

[0078] Therefore, when the insertion member 450 of the second coupling part 400 is inserted through the opening 340 of the storage part 310 and then rotated in the direction opposite to the rotation direction of the storage part 310, the insertion member 450 rotates and moves into the storage space 311 between the openings, and the side part in the rotation direction comes into face-to-face contact with the rotation prevention stopper 312, preventing rotation.

[0079] Such anti-rotation stopper 312 may be formed at a position where the entire insert member 450 is inserted into the storage space 311 between the openings, or may be formed at a position where only a portion of the insert member 450 is inserted into the storage space 311.

[0080] Furthermore, it is preferable that the width of the insert member 450 is smaller than the width of the opening 340 so that the insert member 450 can be easily inserted into the opening 340, and it is also preferable that the length of the insert member 450 is slightly shorter than the length of the opening 340.

[0081] When insertion member 450 is inserted into storage section 310, storage section 310 and insertion member 450 are locked together by lock pin 380, which serves as a locking means, at the position where the side surface of insertion member 450 comes into contact with anti-rotation stopper 312.

[0082] For this purpose, pin fixing holes 360, 430 are formed at corresponding positions of the storage section 310 and the insertion member 450 as locking means, and as shown in FIG. 10, when the insertion member 450 is stored in the storage section 310, a lock pin 380 is inserted into the pin fixing holes 360, 430 to fasten them together.

[0083] In this case, it is preferable that the fixing holes 430 are formed in each of the insert members 450 .

[0084] Also, the lock pin 380 may be provided separately and may be fixed to the receiving part 310 as shown in FIG.

[0085] For this purpose, the lock pin 380 has a straight tubular fixing portion 381 fixed to the outside of one side wall of the storage portion 310 by welding or the like, a pin 382 inserted into the fixing portion 381, a stopper 384 provided on one side of the pin 382, ​​a spring 383 fitted on the outer periphery of the pin 382 between the stopper 384 and the fixing portion 381 to elastically support the pin 382, ​​and the other side of the pin 382 is bent in the direction of the pin fixing holes 360, 430.

[0086] Therefore, after inserting the insert member 450 into the storage section 310, as shown in FIG. 10, rotate it into the storage space 311 so that the pin fixing holes 360, 430 are aligned with each other. Then, the other side of the pin 382 is pulled and the bent portion is rotated toward the pin fixing holes 360, 430 and inserted. As shown in FIG. 12, the elastic support force of the spring 383 allows the bent portion of the pin 382 to remain inserted into the pin fixing holes 360, 430. This fixes the storage section 310 and the insert member 450 together and prevents them from coming apart when rotated under power, thereby achieving coupling between the storage section 310 and the insert member 450.

[0087] As a result, the storage section 310 rotates due to the rotation of the PTO shaft, and this rotational force is transmitted to the insert member 450, and then transmitted via the power transmission coupling section 440 to the power transmission shaft of the work machine.

[0088] When separating the insertion member 450 from the storage section 310, the pin 382 is pulled and rotated toward the side of the storage section 310, and then the storage member 450 is rotated in the rotational direction to position it in the opening 340, thereby allowing it to be easily removed.

[0089] Meanwhile, in the above, a structure has been described in which a plurality of openings 340 are formed in the storage section 310 and a plurality of insert members 450 are formed corresponding to the openings 340. However, in other forms, one or more openings 340 may be formed, and one or more insert members 450 may also be formed to correspond to the openings 340.

[0090] Furthermore, it is desirable to provide a centering member that fixes the center of the insert 450 to the center of the receiving portion 310 when the insert 450 is inserted into the opening 340, thereby preventing the outer edge of the insert 450 from contacting the inner surface of the receiving portion 310 when the insert 450 rotates into the receiving space 311, thereby facilitating easy rotation. To this end, a protruding centering protrusion 313 is formed in the center of the rear plate of the receiving portion 310, and a centering groove 451 is formed in the center of the insert 450. The protrusion 313 and the groove 451 fit together to center the insert 450, allowing the edge of the insert 450 to rotate toward the receiving space 311 without interfering with the inner surface of the receiving portion 310.

[0091] Of course, a centering groove may be formed in the center of the rear plate of the receiving portion 310, and a centering protrusion may be formed in the center of the insert member 450.

[0092] FIG. 13 is a diagram showing yet another embodiment of the present invention. As shown in the figure, the first coupling part 300 has a disk-shaped first body 390, and a PTO connecting part 370 for connecting to the PTO shaft of a tractor is fixed to the rear part of the first body 390, and one or more locking grooves 391 are formed along the periphery.

[0093] Similarly, the second coupling part 400 has a disk-shaped second body 460, and on the front surface of the second body 460, i.e., the part facing the first body 390, one or more locking hooks 461 for engaging with the locking grooves 391 are protruded along the circumferential direction at positions and in numbers corresponding to the locking grooves 391.

[0094] Such a locking hook 461 has a protruding portion 461-1 that protrudes forward, and a bent portion 461-2 that is bent to one side from the tip of the protruding portion 461-1 and has a "┓" shape, and it is preferable that the locking groove 391 has a curved shape in the direction of rotation when the locking hook 461 is inserted and rotated.

[0095] Furthermore, the first body 390 and the second body 460 are each provided with a pin fixing hole and a lock pin as shown in FIGS. 9 and 10, and it is preferable that coupling members are provided at the center of the first body 390 and the center portion of the second body 460 as shown in FIG. 12.

[0096] Therefore, when the locking hook 461 is inserted into the locking groove 391, the bent portion 461-2 passes through the locking groove 391 and protrudes from the rear surface of the first body 390, causing the first coupling part 300 to rotate in the rotational direction for power transmission, or the second coupling part 400 to rotate in the opposite direction, and power transmission is performed by the locking groove 391 and the locking hook 461 engaging and fastening together.

[0097] FIG. 14 is a diagram showing yet another embodiment of the present invention. As shown in the figure, the first coupling part 300 has a disk-shaped first body 390, and a PTO connecting part 370 for connecting to the PTO shaft of a tractor is fixed to the rear part of the first body 390. On the front part, i.e., the part facing the second coupling part 400, one or more locking hooks 392 are provided along the periphery in a "┗" shape and protrude forward.

[0098] Similarly, the second coupling part 400 has a disk-shaped second body 460, and one or more locking devices 462 are provided in a "┓" shape along the outer periphery at positions and in numbers corresponding to the locking hooks 392 of the first body 390.

[0099] Therefore, when the first coupling part 300 is rotated in the rotational direction for power transmission, or the second coupling part 400 is rotated in the opposite direction, the locking hook 392 and the locking device 462 engage with each other like a latch and fasten, thereby transmitting power.

[0100] Similarly, the first body 390 and the second body 460 are preferably provided with a pin fixing hole and a lock pin, respectively, and a coupling member is preferably provided at the center of the first body 390 and the center of the second body 460.

[0101] Instead of the pin fixing holes 360, 430 and lock pin 380 formed in the first body 390 and the second body 460, a locking means having a catch structure may be provided. For example, as shown in FIG. 15, the first body 390 and the second body 460 can be locked together by forming a catch hook 393 on the locking hook 392 of the first body 390 and providing a rotating catch portion 463 on the locking member 462 of the second body 460.

[0102] Of course, the catch portion may be formed on the first body 390 and the catch hook may be formed on the second body 460, and such a catch structure may be applied to other embodiments of the present invention.

[0103] That is, one of the coupling parts is provided with a catch part as a locking means, and the other coupling part is formed with a catch hook, so that when they are coupled together, they are locked together.

[0104] Although specific parts of the present invention have been described in detail above, those skilled in the art will recognize that these specific descriptions are merely preferred embodiments and do not limit the scope of the present invention.

[0105] Accordingly, the true scope of the invention is defined by the appended claims and their equivalents. [Explanation of symbols]

[0106] 300 First coupling part 310 Storage section 311 Storage Space 312 Anti-rotation stopper 313 Centering protrusion 320 Top opening 330, 330' slope 340 Opening 350 bottom 351 Lower opening 360 Pin fixing hole 370 PTO connection section 371 Pinhole 380 Lock Pin 381 Fixed part 382 pins 383 Spring 384 Stopper 390 First Body 391 Locking groove 392 Locking hook 393 Catch Hook 400 Second coupling part 410 Insertion member 420, 420' slope 430 Pin fixing hole 440 Power transmission connection 450 Insert 451 Centering groove 460 Second Body 461 Locking hook 461-1 Protrusion 461-2 Bending section 462 Fasteners 463 Catch part 600 universal joint 610 Shaft connection part 620 gear teeth 800 PTO shaft 900 Power transmission shaft

Claims

1. A PTO coupling device for a tractor, comprising: a first coupling part that is connected to a PTO shaft of a tractor to transmit power; and a second coupling part that is detachably coupled to the first coupling part and connected to a power transmission shaft of a work implement to provide the power transmitted from the first coupling part to the work implement, The first coupling portion is a box-shaped storage section having an open top and a storage space formed therein; a PTO coupling portion fixed to a rear surface portion of the storage portion and coupled to a PTO shaft of the tractor, The second coupling portion is an insertion member having a size and shape to be stored in the storage portion and to be inserted into the storage portion; a power transmission connecting portion fixed to a rear surface portion of the insertion member and connected to a power transmission shaft of the work machine. A PTO coupling device for a tractor.

2. The storage space of the first coupling part is formed so that both side walls or one side wall part narrows downward, and the insert member of the second coupling part is formed so that both side walls or one side wall part is inclined to correspond to the storage space.

2. The tractor PTO coupling device according to claim 1.

3. The first coupling portion has a rear surface integrally formed with a PTO connecting portion for coupling with the PTO shaft, and is configured to transmit power, The second coupling part is detachably coupled to the first coupling part to transmit power, and a universal joint having a shaft connection part for connecting to a power transmission shaft of a work machine is fixed integrally to the rear surface.

2. The tractor PTO coupling device according to claim 1.

4. The first coupling portion and the second coupling portion are locked by a locking means so as not to be separated from each other.

2. The PTO coupling device for a tractor according to claim 1.

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