Hydroelectric Coupling

Abstract

SOLUTION: Provided is an oil-electric coupling (70), in which a first coupling body (34) includes a first hydraulic coupling (72) for supplying hydraulic pressure and a first electrical coupling (74) for supplying voltage, and a second coupling body (62) includes a second hydraulic coupling (90) connected to the first hydraulic coupling and a second electrical coupling (92) connected to the first electrical coupling, wherein the first coupling body is provided with a hydraulic oil intrusion prevention structure that prevents hydraulic oil from intruding into the first electrical coupling from a direction of the first hydraulic coupling.EFFECT: It is possible to prevent hydraulic oil from intruding into the electrical coupling from the hydraulic coupling.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a hydroelectric coupling having a hydraulic coupling and an electric coupling. [Background technology]

[0002] A work implement is attached to a tractor. Some work implements require hydraulic power and electricity (at least one of electric power and an electric signal). When a work implement requiring hydraulic power is attached to a tractor, the hydraulic system of the tractor and the hydraulic system of the work implement are connected to each other. For example, when a hydraulic coupling body on the tractor is connected to a hydraulic coupling body on the work implement, power can be supplied from the tractor to the work implement by hydraulic pressure. Furthermore, when a work implement requiring electricity is attached to a tractor, the electrical system of the tractor and the electrical system of the work implement are connected to each other. For example, when an electrical coupling body on the tractor is connected to an electrical coupling body on the work implement, power can be supplied from the tractor to the work implement by electric power and at least one of electric signals. Patent Document 1 shows an electrical coupling that electrically connects a tractor and a work implement.

[0003] The space around the mechanical connection between the tractor and the implement is narrow. In such a narrow space, it is preferable to arrange a hydroelectric coupling rather than disposing a hydraulic coupling and an electric coupling separately. A hydroelectric coupling includes both a hydraulic coupling and an electric coupling. In a hydroelectric coupling, the hydraulic coupling and the electric coupling are formed integrally with each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-115803 Summary of the Invention [Problem to be solved by the invention]

[0005] In hydraulic couplings, when hydraulic coupling bodies are connected or disconnected, hydraulic oil may leak from the hydraulic oil inlet or hydraulic oil outlet of the upper hydraulic coupling body. In hydroelectric couplings, hydraulic oil leaking from the hydraulic oil inlet or hydraulic oil outlet of the upper hydroelectric coupling body may infiltrate the electrical terminals of the lower hydroelectric coupling body. Furthermore, if hydraulic oil infiltrates the electrical terminals of the hydroelectric coupling body, problems may occur in the supply of power and the transmission of electrical signals.

[0006] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0007] An aspect of the present invention is a hydroelectric coupling having a first coupling body and a second coupling body provided at the attachment portion of a tractor and a work machine, wherein the first coupling body is connected to the second coupling body by moving the first coupling body relatively toward the second coupling body, wherein the first coupling body has a first hydraulic coupling that supplies hydraulic pressure and a first electric coupling that supplies voltage, and the second coupling body has a second hydraulic coupling connected to the first hydraulic coupling and a second electric coupling connected to the first electric coupling, and the first coupling body is provided with a hydraulic oil infiltration prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from the direction of the first hydraulic coupling. [Effects of the Invention]

[0008] According to the present invention, it is possible to prevent hydraulic oil from entering the electric coupling from the hydraulic coupling. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a tractor-side hitch frame. [Figure 2] FIG. 2 is a perspective view of the work machine side hitch frame. [Figure 3] FIG. 3 is a perspective view of the upper guide. [Figure 4] FIG. 4 is a perspective view showing the hydroelectric coupling of the first embodiment. [Figure 5] FIG. 5 is a perspective view showing a first coupling body of a modified example of the first embodiment. [Figure 6] FIG. 6 is a perspective view showing a first coupling body of a modified example of the first embodiment. [Figure 7] FIG. 7 is a perspective view showing a first coupling body of the second embodiment. [Figure 8] FIG. 8 is a left side view showing the first coupling body of the second embodiment. [Figure 9] FIG. 9 is a perspective view showing a first coupling body of a modified example of the second embodiment. [Figure 10] FIG. 10 is a perspective view showing a first coupling body of the third embodiment. [Figure 11] FIG. 11 is a perspective view showing a second coupling body of the third embodiment. [Figure 12] FIG. 12 is a diagram showing a state before the first coupling body and the second coupling body of the third embodiment are connected to each other. [Figure 13] FIG. 13 is a diagram showing a state in which the first coupling body and the second coupling body of the third embodiment are connected to each other. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, a combination of a tractor positioned in front of a work implement and a work implement positioned behind the tractor is assumed. However, the present invention can also be applied to a combination of a tractor positioned behind a work implement and a work implement positioned in front of the tractor. In this case, the front, rear, left, and right directions described below are reversed.

[0011] [1 Tractor side hitch frame 10] FIG. 1 is a perspective view of a tractor-side hitch frame 10. The tractor is equipped with a three-point link hitch consisting of a top link that can swing up and down and two lower links that can also swing up and down. Lift arms are connected to the left and right lower links. When the lift arms move up and down, the lower links also move up and down. The tractor-side hitch frame 10 is attached to this three-point link hitch. As a result, when the lift arms move up and down, the tractor-side hitch frame 10 moves up and down in an arc, restricted by the top link and the tractor-side attachment points of the lower links.

[0012] The tractor-side hitch frame 10 has three mounting sections for attaching to a three-point linkage hitch: an upper mounting section 12, a left mounting section 14, and a right mounting section 16. The upper mounting section 12 is attached to the rear end of the top link. The left mounting section 14 is attached to the rear end of the left lower link. The right mounting section 16 is attached to the rear end of the right lower link.

[0013] The tractor-side hitch frame 10 has multiple frame members, namely, an upper frame 18, a middle frame 20, two lower frames 22 (left and right), a plate 24, a left frame 26, and a right frame 28. The upper frame 18 is located at the center of the tractor-side hitch frame 10 in the width direction (left and right direction) and extends vertically. The middle frame 20 is located below the upper frame 18 and extends horizontally. The middle frame 20 is connected to the upper frame 18. The two lower frames 22 (left and right) and the plate 24 are located below the middle frame 20. The plate 24 is located between the two lower frames 22 (left and right). The two lower frames 22 are connected to the middle frame 20. The plate 24 is connected to the two lower frames 22. A bearing 31 that rotatably supports a spline shaft 30 is attached to the plate 24. The spline shaft 30 is connected to the PTO shaft of the tractor via a universal joint or the like. The left frame 26 is disposed to the left of the top frame 18, the middle frame 20, and the left bottom frame 22. The left frame 26 is connected to the top frame 18, the middle frame 20, and the left bottom frame 22. The left frame 26 extends in a lower left direction from the top frame 18. The right frame 28 is disposed to the right of the top frame 18, the middle frame 20, and the right bottom frame 22. The right frame 28 is connected to the top frame 18, the middle frame 20, and the right bottom frame 22. The right frame 28 extends in a lower right direction from the top frame 18.

[0014] The left frame 26 and the right frame 28 are disposed at the positions of two sides of a roughly isosceles triangle. Each of the left frame 26 and the right frame 28 is inclined at a predetermined angle with respect to the vertical central axis of the tractor-side hitch frame 10. Each of the left frame 26 and the right frame 28 is a hollow member having an angular cross section. However, the cross section of each of the left frame 26 and the right frame 28 may be circular or have another shape.

[0015] The tractor-side hitch frame 10 has a raised portion 32 and a first coupling body 34. The raised portion 32 is attached to the upper end of the upper frame 18. The first coupling body 34 is attached to the upper end of the raised portion 32. The first coupling body 34 is part of a hydroelectric coupling 70 (FIG. 4). Details of the first coupling body 34 will be described later. The first coupling body 34 is connected to tractor-side piping 36 connected to the tractor's hydraulic circuit and to tractor-side wiring (not shown) connected to the tractor's electrical circuit.

[0016] [2 Work machine side hitch frame 40] Fig. 2 is a perspective view of the work machine side hitch frame 40. Fig. 3 is a perspective view of the upper guide 48. The work machine side hitch frame 40 is attached to the front of the work machine. The work machine side hitch frame 40 has three mounting portions that are attached to the work machine, namely, an upper mounting portion 42, a left mounting portion 44, and a right mounting portion (not shown).

[0017] The work machine side hitch frame 40 has multiple guide members, namely a plate 46, an upper guide 48, a left guide 50, and a right guide 52. The plate 46 is disposed rearward of the upper guide 48, the left guide 50, and the right guide 52. The outer shape of the plate 46 is roughly an isosceles triangle. A bearing 63 that rotatably supports a sleeve 64 is attached to the plate 46. The sleeve 64 is connected to the shaft of the work machine.

[0018] The upper guide 48 is connected to the apex of the plate 46 at the center of the work machine hitch frame 40 in the width direction (left-right direction). As shown in FIG. 3, the upper guide 48 has two front and rear primary guides 54F and 54B, two left and right secondary guides 56L and 56R, and a flange 58. The flange 58 has a first hole 59 that penetrates vertically. The front primary guide 54F is connected to a portion of the flange 58 forward of the first hole 59 and extends downward. The front primary guide 54F extends forward and downward from a vertically intermediate portion. Furthermore, the front primary guide 54F gradually widens left and right as it extends downward from the vertically intermediate portion. The rear primary guide 54B is connected to a portion of the flange 58 rearward of the first hole 59 and extends downward. The left secondary guide 56L is connected to a portion of the flange 58 to the left of the first hole 59 and extends downward. The right secondary guide 56R is connected to a portion of the flange 58 to the right of the first hole 59 and extends downward. The left end of the primary guide 54F and the front end of the secondary guide 56L are connected to each other. The right end of the primary guide 54F and the front end of the secondary guide 56R are connected to each other. The left end of the primary guide 54B and the rear end of the secondary guide 56L are connected to each other. The right end of the primary guide 54B and the rear end of the secondary guide 56R are connected to each other.

[0019] Returning to Figure 2, we will continue to explain the work implement hitch frame 40. The left guide 50 is connected to the left equilateral portion of the plate 46. The left guide 50 extends downward and left from the upper guide 48. The left guide 50 is a member that extends forward from the position of the plate 46 and bends to the right, a so-called angle iron. The left guide 50 restricts displacement of the left frame 26 in the front-to-rear and leftward directions when the tractor-side hitch frame 10 and the work implement-side hitch frame 40 are connected.

[0020] The right guide 52 is connected to the right equilateral portion of the plate 46. The right guide 52 extends downward and to the right from the upper guide 48. The right guide 52 is a member that extends forward from the position of the plate 46 and bends to the left, a so-called angle iron. The right guide 52 restricts displacement of the right frame 28 in the front-to-rear and rightward directions when the tractor-side hitch frame 10 and the work implement-side hitch frame 40 are connected.

[0021] The work machine side hitch frame 40 has a second coupling body 62 with a flange 60 formed on its outer periphery. The underside of the second coupling body 62 is exposed downward. The second coupling body 62 is part of a hydroelectric coupling 70 (Fig. 4). Details of the second coupling body 62 will be described later. The second coupling body 62 is connected to work machine side piping 66 connected to the hydraulic circuit of the work machine and to work machine side wiring 65 connected to the electrical circuit of the work machine.

[0022] A shaft 67 extending upward is provided at each of the four corners of the flange 58. Each shaft 67 is inserted into a hole formed in the flange 60. Furthermore, a compression spring 68 is provided on each shaft 67, and a nut 69 is attached to it. The compression spring 68 is compressed by the flange 60 and the nut 69. This compression force urges the second coupling body 62 downward. With this structure, when the guide pin 108 (FIG. 4) is inserted into the guide hole 88 (FIG. 4), any misalignment between them can be absorbed.

[0023] [3. Attaching implements to a tractor] The user can move the tractor-side hitch frame 10 up and down by operating the tractor's lift arm. For example, the user aligns the first coupling body 34 of the tractor-side hitch frame 10 below the upper guide 48 of the implement-side hitch frame 40, and then moves the tractor-side hitch frame 10 upward. As the tractor-side hitch frame 10 moves upward, the first coupling body 34 moves upward. The first coupling body 34 is inserted into the first hole 59 of the upper guide 48 from below the two primary guides 54F, 54B. The first coupling body 34 is guided toward directly below the second coupling body 62 by the two primary guides 54F, 54B and the two secondary guides 56L, 56R. When the height of the tractor-side hitch frame 10 relative to the implement-side hitch frame 40 reaches a predetermined height, the tractor-side hitch frame 10 and the implement-side hitch frame 40 are locked by a locking mechanism (not shown). In this state, the first coupling body 34 and the second coupling body 62 are connected to each other.

[0024] [4 Hydroelectric Coupling 70] [4-1 First Embodiment] Fig. 4 is a perspective view showing the hydroelectric coupling 70 of the first embodiment. In the following description, the front, rear, left and right of the hydroelectric coupling 70 are defined for convenience. However, the front, rear, left and right of the hydroelectric coupling 70 may or may not coincide with the front, rear, left and right of the tractor and work machine. In Fig. 4 and subsequent figures, the flange 60 is omitted for ease of viewing.

[0025] The hydroelectric coupling 70 has a first coupling body 34 located below and a second coupling body 62 located above. Each of the first coupling body 34 and the second coupling body 62 has a hydraulic coupling and an electric coupling. The hydraulic coupling and the electric coupling are an integrated structure.

[0026] The first coupling body 34 has a first hydraulic coupling 72 and a first electrical coupling 74. The first hydraulic coupling 72 has a first outlet 76 and a first inlet 78. The first outlet 76 is connected to the hydraulic oil supply side of the tractor's hydraulic circuit via a connection port 80 and the tractor-side piping 36. The first inlet 78 is connected to the hydraulic oil discharge side of the tractor's hydraulic circuit via a connection port 82 and the tractor-side piping 36. The first electrical coupling 74 has one or more terminals, such as a first positive terminal 84 and a first negative terminal 86. The one or more terminals are connected to one or more electrical circuits (at least one of a power circuit and an electrical signal circuit) of the tractor. The first outlet 76, the first inlet 78, the first positive terminal 84, and the first negative terminal 86 each face upward. The first positive terminal 84 and the first negative terminal 86 are disposed between the first outlet 76 and the first inlet 78. The first coupling body 34 has two guide holes 88. A groove 84P is formed around the first positive terminal 84 to guide the outer frame 104P of the second positive terminal 104. Similarly, a groove 86P is formed around the first negative terminal 86 to guide the outer frame 106P of the second negative terminal 106 (FIG. 11).

[0027] The second coupling body 62 has a second hydraulic coupling 90 and a second electrical coupling 92. The second hydraulic coupling 90 has a second inlet 96 and a second outlet 94. The second inlet 96 is connected to the upstream side of the hydraulic circuit of the work machine via a connection port 100 and the work machine side piping 66. The second outlet 94 is connected to the downstream side of the hydraulic circuit of the work machine via a connection port 102 and the work machine side piping 66. The second electrical coupling 92 has one or more terminals, for example, a second positive terminal 104 and a second negative terminal 106 (not shown in FIG. 4 ). The one or more terminals are connected to one or more electrical circuits (at least one of a power circuit and an electrical signal circuit) of the work machine. The second outlet 94, the second inlet 96, the second positive terminal 104, and the second negative terminal 106 each face downward. The second positive electrode terminal 104 and the second negative electrode terminal 106 are disposed between the second outlet 94 and the second inlet 96. The second coupling body 62 has two guide pins 108. An outer frame 104P is formed around the second positive electrode terminal 104 to be inserted into the groove 84P of the first positive electrode terminal 84. Similarly, an outer frame 106P is formed around the second negative electrode terminal 106 to be inserted into the groove 86P of the first negative electrode terminal 86.

[0028] When the first coupling body 34 moves upward relative to the second coupling body 62, the first coupling body 34 and the second coupling body 62 are connected to each other. Specifically, the two guide pins 108 of the second coupling body 62 are inserted into the guide holes 88 of the first coupling body 34. Next, the second inlet 96 is inserted into the first outlet 76, thereby connecting the first outlet 76 and the second inlet 96 to each other. Furthermore, the second outlet 94 is inserted into the first inlet 78, thereby connecting the first inlet 78 and the second outlet 94 to each other. Furthermore, the first positive electrode terminal 84 and the second positive electrode terminal 104 are connected to each other, and the first negative electrode terminal 86 and the second negative electrode terminal 106 are connected to each other.

[0029] The length of each guide pin 108 is longer than the length of the second outlet 94, the length of the second inlet 96, and the lengths of the outer frames 104P, 106P. This allows accurate alignment between the first outlet 76 and the second inlet 96, between the first inlet 78 and the second outlet 94, between the first positive electrode terminal 84 and the second positive electrode terminal 104, and between the first negative electrode terminal 86 and the second negative electrode terminal 106.

[0030] The first coupling body 34 is provided with a hydraulic oil infiltration prevention structure that prevents oil from infiltrating from the first hydraulic coupling 72 to the first electrical coupling 74. In the first embodiment, as the hydraulic oil infiltration prevention structure, a step is formed between an upper surface 110 of the first hydraulic coupling 72 and an upper surface 112 of the first electrical coupling 74. In other words, walls 114 are formed as the hydraulic oil infiltration prevention structure along the entire boundary between the first hydraulic coupling 72 and the first electrical coupling 74. The walls 114 are located on the left and right sides of the first electrical coupling 74. The upper end of the walls 114, i.e., the upper surface 112 of the first electrical coupling 74, is located above the upper surface 110 of the first hydraulic coupling 72. In other words, the first electrical coupling 74 is located at a higher position than the first hydraulic coupling 72. With this hydraulic oil infiltration prevention structure, even if hydraulic oil leaks from the first outlet 76 or the first inlet 78 of the first hydraulic coupling 72, the walls 114 (steps) will block the hydraulic oil. In this manner, the wall 114 prevents hydraulic oil from entering the first positive terminal 84 and the first negative terminal 86 .

[0031] [4-2 Modification of the first embodiment] In the first embodiment described above, one or more first positive electrode terminals 84 and one or more first negative electrode terminals 86 are arranged between the first outlet 76 and the first inlet 78. However, the horizontal arrangement of the first positive electrode terminals 84, one or more first negative electrode terminals 86, the first outlet 76, and the first inlet 78 is not limited. For example, as shown in FIG. 5 , the first outlet 76 and the first inlet 78 may be arranged between the one or more first positive electrode terminals 84 and the one or more first negative electrode terminals 86. The one or more first positive electrode terminals 84 and the one or more first negative electrode terminals 86 may be arranged along the front-rear direction or the left-right direction. Similarly, the first outlet 76 and the first inlet 78 may be arranged along the front-rear direction or the left-right direction.

[0032] Also, as shown in FIG. 6, the first electrical coupling 74, in which one or more first positive terminals 84 and one or more first negative terminals 86 are aligned, and the first hydraulic coupling 72, in which the first outlet 76 and the first inlet 78 are aligned, may be aligned either front to back or left to right.

[0033] [4-3 Second embodiment] Fig. 7 is a perspective view showing the first coupling body 34 of the second embodiment. Fig. 8 is a left side view showing the first coupling body 34 of the second embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0034] In the first coupling body 34 of the second embodiment, a groove 116 is formed as a hydraulic oil infiltration prevention structure between an upper surface 110 of the first hydraulic coupling 72 and an upper surface 112 of the first electrical coupling 74. As shown in Fig. 7, the first coupling body 34 may be provided with a wall 114, similar to the first embodiment.

[0035] In FIG. 8, the bottom surface 118 of the groove 116 is indicated by a dashed line. As shown in FIG. 8, the groove 116 includes a first groove 116a and a second groove 116b. The first groove 116a is formed in a range forward of the central portion of the first coupling body 34 in the front-to-rear direction. The first groove 116a is connected to a front exhaust port 120a that opens into the front outer wall of the first coupling body 34. The position of the bottom surface 118 of the first groove 116a becomes lower as it approaches the front exhaust port 120a. The second groove 116b is formed in a range rearward of the central portion of the first coupling body 34 in the front-to-rear direction. The second groove 116b is connected to a rear exhaust port 120b that opens into the rear outer wall of the first coupling body 34. The position of the bottom surface 118 of the second groove 116b becomes lower as it approaches the rear exhaust port 120b. According to this hydraulic oil intrusion prevention structure, even if hydraulic oil leaks from the first outlet 76 or the first inlet 78 of the first hydraulic coupling 72, the groove 116 guides the hydraulic oil to the outside of the first coupling body 34. In this way, the groove 116 prevents hydraulic oil from infiltrating the first positive electrode terminal 84 and the first negative electrode terminal 86.

[0036] The inclination angle of the first groove 116a and the inclination angle of the second groove 116b may be different from each other. Furthermore, the length of the first groove 116a and the length of the second groove 116b may be different from each other. At least one of the front discharge port 120a and the rear discharge port 120b may be omitted. In this case, the hydraulic oil that flows through the first groove 116a or the second groove 116b flows down along the wall surface of the first coupling body 34. Furthermore, at least one of the front discharge port 120a and the rear discharge port 120b may be a hole that penetrates the first coupling body 34.

[0037] [4-4 Modification of the second embodiment] The first coupling body 34 of the second embodiment does not require the wall 114. For example, as shown in Fig. 9, the upper surface 110 of the first hydraulic coupling 72 may be disposed at a position higher than the upper surface 112 of the first electrical coupling 74. Alternatively, the upper surface 110 of the first hydraulic coupling 72 and the upper surface 112 of the first electrical coupling 74 may be disposed at the same height.

[0038] Furthermore, the bottom surface 118 of the groove 116 may be inclined either towards the front or the back, rather than inclined towards both the front and the back.

[0039] [4-5 Third embodiment] FIG. 10 is a perspective view showing the first coupling body 34 of the third embodiment. FIG. 11 is a perspective view showing the second coupling body 62 of the third embodiment. FIG. 12 is a view showing the state before the first coupling body 34 and the second coupling body 62 of the third embodiment are connected. FIG. 13 is a view showing the state after the first coupling body 34 and the second coupling body 62 of the third embodiment are connected. In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. The third embodiment is an application example of the second embodiment.

[0040] 10, the first hydraulic coupling 72 is disposed at the front of the first coupling body 34, and the first electrical coupling 74 is disposed at the rear. A groove 116 is formed between the first hydraulic coupling 72 and the first electrical coupling 74. A bottom surface 118 of the groove 116 is inclined downward and to the right.

[0041] As shown in Figure 11, the second hydraulic coupling 90 is disposed in the front of the second coupling body 62, and the second electrical coupling 92 is disposed in the rear. A discharge portion 124 is disposed between the second hydraulic coupling 90 and the second electrical coupling 92 and above the groove 116. The discharge portion 124 is a rod-shaped member attached to the second coupling body 62. At least the base of the discharge portion 124 is formed by an elastic member (e.g., a spring). The discharge portion 124 extends from the second coupling body 62 toward the lower right.

[0042] 12 and 13 , when the first coupling body 34 and the second coupling body 62 are connected, the lower end of the discharge portion 124 moves downward and to the right while contacting the bottom surface 118 of the groove 116. If hydraulic oil, dust, or other foreign matter has accumulated in the groove 116, the discharge portion 124 pushes the foreign matter to the right and discharges it from the discharge port 120. Therefore, the discharge portion 124 can prevent hydraulic oil from entering the first positive electrode terminal 84 and the first negative electrode terminal 86.

[0043] [4-6 Modification of the third embodiment] The discharge portion 124 only needs to have the function of discharging foreign matter that has entered the groove 116 and accumulated in the groove 116 to the outside of the groove 116. For example, the discharge portion 124 may be a plate-shaped member that fits into the groove 116. When the plate-shaped discharge portion 124 fits into the groove 116, the hydraulic oil that has accumulated in the groove 116 is pushed out by the discharge portion 124 and discharged to the outside of the groove 116. Note that the lower end of the plate-shaped discharge portion 124 does not need to contact the bottom surface 118 of the groove 116.

[0044] In each embodiment, the first coupling body 34 disposed below moves toward the second coupling body 62 disposed above. Alternatively, the second coupling body 62 disposed above may move toward the first coupling body 34 disposed below. Alternatively, the first coupling body 34 disposed above may move toward the second coupling body 62 disposed below, or the second coupling body 62 disposed below may move toward the first coupling body 34 disposed above.

[0045] The present invention is not limited to the use of a tractor side hitch frame 10 and a work implement side hitch frame 40, but can be used for a pair of hitch frames that can be attached and detached from each other by moving them up and down.

[0046] [5 Inventions Obtained from the Embodiments] The invention that can be understood from the above embodiment will be described below.

[0047] An aspect of the present invention is a hydroelectric coupling (70) having a first coupling body (34) and a second coupling body (62) provided at the attachment portion between a tractor and a work machine, and the first coupling body is connected to the second coupling body by moving the first coupling body relatively toward the second coupling body, the first coupling body having a first hydraulic coupling (72) that supplies hydraulic pressure and a first electric coupling (74) that supplies voltage, the second coupling body having a second hydraulic coupling (90) connected to the first hydraulic coupling and a second electric coupling (92) connected to the first electric coupling, and the first coupling body is provided with a hydraulic oil infiltration prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from the direction of the first hydraulic coupling.

[0048] In an aspect of the present invention, the hydraulic oil intrusion prevention structure is a wall (114) formed between the upper surface (112) of the first electric coupling and the upper surface (110) of the first hydraulic coupling, and the upper end of the wall may be located higher than the upper end of the first hydraulic coupling.

[0049] In an aspect of the present invention, the hydraulic oil intrusion prevention structure may be a groove (116) formed between an upper surface of the first electric coupling and an upper surface of the first hydraulic coupling.

[0050] In an aspect of the present invention, the groove may have a discharge port (120) that opens into the outer wall of the first coupling body, and the position of the bottom surface (118) of the groove may become lower as it approaches the discharge port.

[0051] In an aspect of the present invention, a discharge portion (124) may be provided that enters the groove and discharges foreign matter from the groove when the first coupling body is connected to the second coupling body.

[0052] In an aspect of the present invention, the first coupling body may be attached to a tractor side hitch frame (10), and the second coupling body may be attached to a work implement side hitch frame (40), and the tractor side hitch frame may be attached to the work implement side hitch frame by moving the tractor side hitch frame upward, thereby connecting the first coupling body to the second coupling body. [Explanation of symbols]

[0053] 10...Tractor side hitch frame 40...Work machine side hitch frame 34...First coupling body 62...Second coupling body 70...Hydroelectric coupling 72...First hydraulic coupling 74...First electric coupling 90...Second hydraulic coupling 92... Second electric coupling 110, 112... Top surface 114…Wall 116…Groove 118...Bottom 120...Outlet 120a...Front outlet 120b...Rear outlet 124...Discharge section

Claims

1. A hydroelectric coupling having a first coupling body and a second coupling body provided at attachment portions between a tractor and a work implement, wherein the first coupling body is connected to the second coupling body by relatively moving the first coupling body toward the second coupling body, the first coupling body includes a first hydraulic coupling that supplies hydraulic pressure and a first electrical coupling that supplies voltage; the second coupling body includes a second hydraulic coupling connected to the first hydraulic coupling and a second electrical coupling connected to the first electrical coupling, the first coupling body is provided with a hydraulic oil intrusion prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from a direction of the first hydraulic coupling, the hydraulic oil intrusion prevention structure is a wall formed between an upper surface of the first electric coupling and an upper surface of the first hydraulic coupling, A hydroelectric coupling, wherein an upper end of the wall is located higher than an upper end of the first hydraulic coupling.

2. A hydroelectric coupling having a first coupling body and a second coupling body provided at the attachment portion between a tractor and a work implement, wherein the first coupling body is connected to the second coupling body by moving the first coupling body relatively toward the second coupling body, the first coupling body includes a first hydraulic coupling that supplies hydraulic pressure and a first electrical coupling that supplies voltage; the second coupling body includes a second hydraulic coupling connected to the first hydraulic coupling and a second electrical coupling connected to the first electrical coupling, the first coupling body is provided with a hydraulic oil intrusion prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from a direction of the first hydraulic coupling, the hydraulic oil intrusion prevention structure is a groove formed between an upper surface of the first electric coupling and an upper surface of the first hydraulic coupling, the groove has a discharge port that opens into an outer wall of the first coupling body, The hydroelectric coupling, wherein the position of the bottom surface of the groove becomes lower as it approaches the outlet.

3. A hydroelectric coupling having a first coupling body and a second coupling body provided at the attachment portion between a tractor and a work implement, wherein the first coupling body is connected to the second coupling body by moving the first coupling body relatively toward the second coupling body, the first coupling body includes a first hydraulic coupling that supplies hydraulic pressure and a first electrical coupling that supplies voltage; the second coupling body includes a second hydraulic coupling connected to the first hydraulic coupling and a second electrical coupling connected to the first electrical coupling, the first coupling body is provided with a hydraulic oil intrusion prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from a direction of the first hydraulic coupling, the hydraulic oil intrusion prevention structure is a groove formed between an upper surface of the first electric coupling and an upper surface of the first hydraulic coupling, A hydroelectric coupling comprising a discharge portion that enters the groove and discharges foreign matter from the groove when the first coupling body is connected to the second coupling body.

4. A hydroelectric coupling having a first coupling body and a second coupling body provided at the attachment portion between a tractor and a work implement, wherein the first coupling body is connected to the second coupling body by moving the first coupling body relatively toward the second coupling body, the first coupling body includes a first hydraulic coupling that supplies hydraulic pressure and a first electrical coupling that supplies voltage; the second coupling body includes a second hydraulic coupling connected to the first hydraulic coupling and a second electrical coupling connected to the first electrical coupling, the first coupling body is provided with a hydraulic oil intrusion prevention structure that prevents hydraulic oil from infiltrating into the first electric coupling from a direction of the first hydraulic coupling, The first coupling body is attached to a tractor-side hitch frame, The second coupling body is attached to a work machine side hitch frame, A hydroelectric coupling in which the tractor side hitch frame is attached to the work machine side hitch frame by moving the tractor side hitch frame upward, thereby connecting the first coupling body to the second coupling body.

5. 5. The hydroelectric coupling according to claim 4, The hydraulic oil intrusion prevention structure is a groove formed between an upper surface of the first electric coupling and an upper surface of the first hydraulic coupling.

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