KR20240057039A - Hitch device for trailer - Google Patents

Abstract

The present invention relates to a trailer hitch device, which is connected to and towed by an agricultural vehicle. The trailer hitch device is provided with an outrigger that is rotatably connected to and mounted on a trailer, and the outrigger is a three-point link of the agricultural vehicle. It provides a trailer hitch device that is towed by being connected to an upper hook and a lower hook that rotate up and down in conjunction with the.

Description

Trailer hitch device {Hitch device for trailer}

The present invention relates to a trailer hitch device, and more specifically, to a trailer hitch device that can easily connect a trailer to an agricultural vehicle and prevent the trailer from moving when loading and unloading a load on the trailer.

In general, a tractor used as an agricultural vehicle is used by installing various work equipment necessary for clearing farmland, etc., and has a trailer at the rear to transport grain harvested in farmland, etc. or to transport compost and agricultural machinery to the desired location. It is used in connection.

Most of these tractor trailers do not have a dump function, but some have a dump function to facilitate unloading when unloading loads such as compost.

Such a trailer is generally provided with a towing part, that is, a towing rod, rotatably connected to the rear of the tractor in front of the lower frame of the trailer, and rotatably installed wheels at the rear.

Accordingly, when the trailer is not in use, the front is supported using a support bar on the towing rod provided from the lower frame of the trailer, and the support using a screw bar is widely used. When a trailer is installed at the rear of a tractor, after the tow rod is connected to the tractor, the lower end of the support is lifted off the ground by turning the handle installed on the top of the support, making it possible to tow.

However, in a conventional trailer, the stern with the tow rod is heavier than the rear, so after removing the support from the tow rod, the tow rod is lowered and touches the ground, and in this state, the tow rod of the trailer is attached to the hitch bar at the rear of the tractor. When connecting, the trailer's tow rod, which is tilted downward, is lifted up to the hitch bar of the tractor and connected by inserting it into the hitch bar. In the connected state, a pin is coupled to the hitch bar to prevent the tow rod from coming off. This is how to connect a trailer. As all of this is done manually by workers, it is not only very inconvenient and cumbersome, but there is also a risk of safety accidents occurring in the process of lifting the tow rod of the trailer.

Republic of Korea Patent Publication No. 10-2009-0109924

Therefore, the present invention was devised to solve the problems of the prior art as described above. An outrigger is provided at the front end of a trailer, and the outrigger of the trailer is towed and easily mounted as a three-point link at the rear of an agricultural vehicle. The purpose is to provide a trailer hitch device that can easily connect a trailer to an agricultural vehicle and prevent the trailer from moving when loading and unloading the load on the trailer.

The trailer hitch device according to the present invention for achieving the above-described purpose is a trailer hitch device that is connected to and towed by an agricultural vehicle. The trailer hitch device is equipped with an outrigger that is rotatably connected to and mounted on a trailer, and the outrigger is It is characterized in that it is towed by being connected to an upper hook and a lower hook that rotate up and down in conjunction with the three-point link of the agricultural vehicle.

In addition, the outrigger includes a vertical frame and a horizontal frame that protrudes on both sides of the vertical frame, and the vertical frame is provided with an upper pin on which an upper hook is mounted and a hitch portion to which the trailer is rotatably connected, Lower pins on which lower hooks are respectively mounted may be provided on both sides of the horizontal frame.

In addition, downwardly inclined support frames may be provided on both sides of the horizontal frame to be supported in contact with the ground.

Additionally, the support frame may be provided with a support plate that is in parallel contact with the ground when in contact with the ground.

In addition, the hitch unit may be provided on the front and rear sides of the vertical frame, respectively, so that the trailer can be connected to the agricultural vehicle at a short or long distance apart.

In addition, the trailer is equipped with a universal joint to provide power to the implement loaded on it, and the universal joint is equipped with a dog clutch that penetrates the vertical frame of the outrigger and is connected to the PTO shaft of the agricultural vehicle, It can be equipped to drive a work machine loaded on a trailer.

Meanwhile, guide protrusions are provided on the vertical frames on both sides of the upper pin, and surfaces facing both guide protrusions may be provided with inclined surfaces that guide the upper hook so that it can be properly coupled to the upper pin.

According to the trailer hitch device of the present invention, an outrigger is provided at the front end of the trailer to firmly support the trailer above a certain height, and a three-point link at the rear of the agricultural vehicle is connected to the outrigger of the trailer and is mounted on the trailer. It has the advantage of being easy to install.

In addition, according to the present invention, loading and unloading of the load is carried out in the loading box of the trail while the outrigger of the trailer connected to the rear of the agricultural vehicle is seated on the ground, thereby preventing the movement of the trailer, making loading and unloading work safe and convenient. There is an advantage to this.

1 is a diagram showing an outrigger of a trailer according to the present invention.
FIG. 2 is a diagram showing first and second hitch parts included in the outrigger of a trailer according to the present invention. FIG. 2A is a plan view of the first hitch part, and FIG. 2B is a view showing the second hitch part from the bottom. am.
Figure 3 is a side configuration diagram showing the outrigger of a trailer according to the present invention.
Figure 4 is a diagram of a state in which the outrigger and tractor of the trailer according to the present invention are separated.
Figure 5 is a diagram showing a state in which the outrigger of the trailer and the tractor according to the present invention are connected.
Figure 6 is a diagram showing a quick attachment configured at the rear of a tractor according to the present invention.
FIG. 7 is an enlarged configuration diagram of portion “A” of FIG. 4.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

The terms used in the present invention are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator, so the definitions of these terms are defined in accordance with the technical details of the present invention. It should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely illustrative of the components presented in the claims of the present invention, and are included in the technical idea throughout the specification of the present invention and are included in the claims. This is an embodiment that includes components that can be replaced as equivalents in the components.

Additionally, optional terms in the examples below are used to distinguish one component from another component, and the components are not limited by the terms.

Accordingly, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention are omitted.

1 to 7 are diagrams showing a trailer hitch device and a quick attachment according to the present invention.

As shown in FIGS. 1 to 3, the trailer hitch device according to the present invention includes an outrigger 100 provided in front of the trailer 40, and the agricultural vehicle towing the trailer 40 is a tractor ( 1) will be explained as an example.

This outrigger 100 is rotatably connected to the stern of the trailer 40, and in this state, the outrigger 100 is a quick shaft that rotates up and down by a three-point link provided at the rear of the tractor 1. It is connected to the upper hook 211 and the lower hook 221 of the attachment 200, and is provided to be lifted and towed from the ground.

This outrigger 100 is provided in contact with the ground when loading or unloading a load such as a bale on the trailer 40, so that the trailer ( 40) Alternatively, tilting of the tractor 1 can be prevented, and thus loading and unloading can be carried out quickly and safely.

Meanwhile, as shown in FIG. 1, the outrigger 100 includes a vertical frame 110 located in the center and a horizontal frame 120 protruding on both sides of the vertical frame 110. .

In addition, the upper surface of the vertical frame 110 is provided with an upper pin 111 on which the upper hook 211 of the quick attachment 200 is caught and mounted, and the quick attachment 200 is installed on both sides of the front of the horizontal frame 120. The lower hooks 221 are provided with lower pins 121 that are respectively hooked and mounted.

In particular, because the upper pin 111 is provided on the upper surface of the vertical frame 110, the upper hook 211 may not be connected accurately at once. Accordingly, in order to enable the upper hook 211 to be coupled to the upper pin 111 exactly at once, guide protrusions 118 are provided on both sides of the upper surface of the vertical frame 110 equipped with the upper pin 111, respectively. It is provided, and the facing surface of both guide protrusions 118 is an inclined surface that guides the upper hook 211 of the quick attachment 200 to the upper pin 111 so that it can be coupled to the upper pin 111 in the correct position. is formed

As a result, even in a state where the upper hook 211 is not positioned in the correct position on the upper pin 111 and is biased to one side, the upper hook 211 is guided to the upper pin 111 by the inclined surfaces of both guide protrusions 118. Can be combined by location.

In addition, at the rear of the vertical frame 110, a plurality of hitch portions 113 and 114 are formed to which the towing rod 41 protruding toward the front of the trailer 40 is selectively connected. These hitch portions 113 and 114 include a plurality of upper and lower brackets protruding from the rear of the vertical frame 110, as shown in FIGS. 2A and 2B, and a hitch pin 115 that penetrates and couples the upper and lower brackets in order. Includes.

Accordingly, the tow rod 41 of the trailer 40 is inserted between the upper and lower brackets of the hitch parts 113 and 114, and in this state, the hitch pin 115 is attached to the upper bracket of the hitch parts 113 and 114. The tow rod 41 of the trailer 40 can be rotatably connected to the hitch portions 113 and 114 by sequentially connecting the tow rod 41 and the lower bracket.

The hitch parts 113 and 114 as described above are composed of first and second hitch parts 113 and 114 located respectively at the rear center and lower side of the vertical frame 110, as shown in FIGS. 2A and 2B. , the lower second hitch part 114 is provided and positioned forward of the central first hitch part 113, as shown in FIG. 3.

The reason for providing different positions of the first and second hitch parts 113 and 114 in this way is that when the trailer 40 is equipped with a work tool that requires power, such as a compost spreader, the tow rod 41 of the trailer 40 ) is connected to the first hitch portion 113, and the joint 140 of the trailer 40, which will be described later, is automatically connected to the power transmission unit 230 of the tractor 1 to transmit power, and the trailer ( If only load is loaded without transmitting power to 40), a lot of load will be loaded on trailer 40, so the tow rod 41 of trailer 40 is connected to the second hitch part 114 to connect trailer 40. This is to ensure safety when loading, unloading, and transporting the load by locating it as close as possible to the tractor (1).

At this time, when connecting the towing rod 41 of the trailer 40 to the second hitch part 114 at the front, the joint 140 and the dog clutch 141 of the trailer 40, which will be described later, are connected to the outrigger 100 and the dog clutch 141. By being separated and spaced apart, interference with the outrigger 100 can be avoided.

Meanwhile, as described above, the power transmission unit 230 of the tractor 1 is connected to the joint 140 of the trailer 40 in the vertical frame 110 between the first hitch portion 113 and the upper pin 111. A connector 112 is formed, and this connector 112 is drilled to a diameter through which the dog clutch 141 of the joint 140, which will be described later, can penetrate.

In addition, the vertical frame 110 between the connector 112 and the first hitch part 113 and between the first hitch part 113 and the second hitch part 114 is penetrated as shown in FIG. 1, respectively, so that the first, 2 Through-holes 116 and 117 are formed to expose the hitch parts 113 and 114, and hitch pins are connected to the first and second hitch parts 113 and 114 through these through-holes 116 and 117. (115) can be easily combined or separated.

Meanwhile, support frames 130 are provided at both ends of the horizontal frame 120 in contact with the ground to support the outrigger 100 and the trailer 40, and both support frames 130 are located on both sides of the horizontal frame 120. It is formed to slope downward toward the ground at the end.

In addition, the lower ends of both support frames 130 are provided with support plates 131 that are in parallel contact with the ground when in contact with the ground.

This means that when the tow rod 41 of the trailer 40 is connected to the second hitch part 114 and towed, the driver of the tractor 1 uses the upper and lower hooks 211 and 221 of the quick attachment 200. Towing must be done with the outrigger 100 of the trailer 40 lifted upward, but due to inexperience in driving or misoperation, the outrigger 100 is often towed as it is in contact with the ground without being lifted upward. At this time, the support plate 131 in contact with the ground is positioned parallel to the ground, thereby minimizing interference with the ground and enabling smooth traction movement.

In addition, the tip of the support footrest 131 is formed in the shape of a ski bent upward, preventing interference between the support footrest 131, which is moved while in contact with the ground, and the ground, thereby ensuring smooth movement of the support footrest 131. can be derived.

Meanwhile, the trailer 40 connected to and towed by the tractor 1 as described above is equipped with a joint 140 for providing power to a working machine such as a compost spreader loaded thereon, as shown in FIGS. 4 and 5, and the joint ( 140) is provided with a dog clutch 141 that passes through the connector 112 of the vertical frame 110 of the outrigger 100 and is connected to the PTO shaft of the agricultural vehicle.

At this time, the joint 140 may be provided as a universal joint that penetrates the front plate of the trailer 40, and a dog clutch 141 that rotates like the joint 140 is coupled to the front end of the joint 140, , the rear axle of the joint 140 protrudes from the loading box of the trailer 40 and is detachably coupled to a workpiece such as a compost spreader loaded on the trailer 40, thereby transmitting the power of the tractor 1 to the workpiece. It can be operated.

Meanwhile, as shown in FIGS. 6 and 7, at the rear of the tractor 1 towing the outrigger 100 of the trailer 40 as described above, there is a three-point link, that is, one upper link 10 and a plurality of A lower link 20 is provided, and one end of the upper and lower links 10 and 20, that is, the front end, is hinged to the rear of the tractor 1 and rotated up and down.

In addition, the upper and lower links 10 and 20 are each provided with upper and lower cylinders that operate each link, and one end of the upper and lower cylinders is also hinged to the rear of the tractor 1 to rotate up and down. do.

The other end of the upper link 10 provided in this way is hinged and connected to the frame 210 of the quick attachment 200, which will be described later, and the other end of the lower link 20 is connected to both sliders of the quick attachment 200 ( 220), respectively, are hinged and connected to each other.

This quick attachment 200 is provided at the rear of the tractor 1 to automatically and quickly connect the outrigger 100 of the trailer 40.

As shown in FIGS. 6 and 7, this quick attachment 200 is connected to the frame 210 to which the upper link 10 of the three-point links of the tractor 1 is hinged, and to the ground on both sides of the frame 210. It is provided to face and includes a slider 220 to which the lower link 20 of the three-point links is hinged.

The frame 210 is a hollow square pipe that is installed in the left and right directions at the rear of the tractor 1, and protrudes rearward from the upper part of the frame 210 and is provided on the outrigger 100 of the trailer 40. The upper hook 211 coupled to the upper pin 111 is rotatable.

In addition, the slider 220 is also provided with a square pipe corresponding to the frame 210 and is slidably coupled to both sides of the frame 210 in a shape-matched manner, so that both sliders 220 are connected to the frame (210) on both sides of the frame 210. The width of both sliders 220 can be adjusted to correspond to the gap between both lower pins 121 of the outrigger 100 by moving them in and out in the axial direction of 210.

In addition, a lower hook 221 rotatably coupled to the lower pin 121 provided on the outrigger 100 of the trailer 40 is provided at the lower end of the slider 220, and this lower hook 221 and the upper The hook 211 may be rotated by the three-point link of the tractor 1, that is, the lower link 20 and the upper link 10.

Meanwhile, on the lower surface of the slider 220 as described above, a support frame 222 of a square pipe may be provided to go in and out toward the ground, and the support frame 222 that goes in and out of the slider 220 is supported by the slider 220. The position is fixed by a fixing pin 223 penetrating the frame 222. At this time, the slider 220 may be provided with a plurality of fixing holes vertically through which the fixing pins 223 are coupled, and one fixing hole may be provided in the support frame 222 corresponding to the fixing holes. .

As a result, the position of the support frame 222 pulled out from the slider 220 can be adjusted to various heights, and when the support frame 222 pulled out from the slider 220 is grounded on the ground, the quick attachment 200 is grounded on the ground. In addition to being firmly supported and fixed, the tractor (1) and trailer (40) are firmly supported and fixed on the ground through interaction with the support frame (130) provided on the outrigger (100) of the trailer (40). Loads such as bales can be quickly loaded and unloaded in a stable condition.

Meanwhile, a power transmission unit 230 is provided on the lower surface of the frame 210 to transmit the power of the tractor 1 to the trailer 40, and this power transmission unit 230 includes a joint 140 of the trailer 40. ) are combined and connected.

As shown in FIG. 7 , the power transmission unit 230 includes an output shaft 231 that is positioned downward on the frame 210 via a fixing plate 232. One end of this output shaft 231 is connected to the PTO shaft of the tractor 1 and the universal joint 30, so that the power of the tractor 1 is transmitted and output to the output shaft 231, and the other end of the output shaft 231 is connected to the universal joint 30. A dog clutch 235 corresponding to the dog clutch 141 provided at the joint 140 of the trailer 40 is provided, and the power of the tractor 1 is transferred to the trailer by combining both dog clutches 141 and 235. It is smoothly transmitted to (40), making it possible to drive the work machine provided in the loading box of the trailer (40).

At this time, the output shaft 231 is positioned at the lower part of the frame 210 by the fixing plate 232, so that installation space for the universal joint 30 connected thereto can be easily secured.

Additionally, the fixing plate 232 has tension because its upper end is provided as a fixed end fixed to the frame 210 and its lower end is provided as a free end.

In addition, a support pin 233 is provided to penetrate the fixing plate 232 on the upper part of the output shaft 231, and between the support pin 233 and the fixing plate 232, the floating output shaft 231, that is, the fixing plate 232, is returned to its original position. An elastic member for returning, that is, a spring 234, is provided.

Therefore, in the process of combining the dog clutch 235 of the output shaft 231 and the dog clutch 141 of the trailer 40, if the teeth between the two dog clutches 141 and 235 come into contact with the teeth being shifted from the correct position, , in the process in which the dog clutch 235 of the output shaft 231 is elastically pushed backward by the fixing plate 232 and then moved forward by the restoring force of the spring 234, both dog clutches 141 and 235 are connected to each other. It is rotated slightly by the tooth shape and meshed into the correct position.

The teeth of these dog clutches (141) (235) are formed by a vertical surface that protrudes perpendicularly from the surface of the dog clutch (141) (235) and an inclined surface that extends obliquely from the vertex of the vertical surface back to the surface of the dog clutch (141) (235). As such, the inclined surfaces of both dog clutches 141 and 235 are provided to face each other, and the two dog clutches 141 and 235 are smoothly engaged and coupled by contact between the two inclined surfaces.

Additionally, the support pin 233 may be composed of a bolt and a nut, and the elastic member may be provided as a compression coil spring 234.

The installation process of the trailer hitch device according to the present invention as described above will be described.

First, when using the trailer 40 only for transporting a load, the tow rod 41 protruding in front of the trailer 40 is attached to the hitch pin on the second hitch portion 114 located in front of the outrigger 100. By combining with (115), the trailer 40 and the outrigger 100 are connected to enable relative rotation.

At this time, since the joint 140 and the dog clutch 141 of the trailer 40 are positioned toward the trailer 40, interference with the outrigger 100 does not occur.

In this way, the upper hook 211 and lower hook of the quick attachment 200 provided at the rear of the tractor 1 are attached to the upper pin 111 and lower pin 121 of the outrigger 100 coupled to the trailer 40 ( 221) are hooked and coupled from the upper and lower sides, respectively, and then the outrigger 100 is lifted upward and spaced apart from the ground, and the trailer 40 is towed and moved.

Thereafter, in order to load or unload the load on the trailer 40, the upper hook 211 and lower hook 221 of the quick attachment 200 are operated to lower the outrigger 100, which was lifted upward, and the lowered outrigger 100 is lowered. The trigger 100 supports the trailer 40 in a horizontal state with the ground as the support plate 131 of the support frame 130 comes into contact with the ground.

In addition, the slider 220 is pulled out and expanded to the left and right from the frame 210 of the quick attachment 200, and then the support frame 222 is pulled out from the lower surfaces of both sliders 220 and fixed in a state in contact with the ground. By doing so, the support frame 222 of the quick attachment 200 can firmly support the tractor 1 and the trailer 40 together with the support frame 130 of the outrigger 100, and thus the trailer 40 Loads can be quickly loaded or unloaded in a stable condition.

Meanwhile, when it is desired to load and operate a work tool such as a compost spreader on the trailer 40, attach the towing rod 41 of the trailer 40 to the first hitch portion 113 located at the rear center of the outrigger 100. By combining with a hitch pin 115, the trailer 40 and the outrigger 100 are connected to enable relative rotation.

In this way, the trailer 40 and the outrigger 100 are connected and at the same time, the dog clutch 141 of the joint 140 provided on the trailer 40 is pulled forward through the connector 112 of the outrigger 100. It is provided so that it protrudes.

In this state, when the upper hook 211 and lower hook 221 of the quick attachment 200 are coupled to the upper pin 111 and lower pin 121 of the outrigger 100, respectively, the quick attachment 200 The dog clutch 235 of the power transmission unit 230 faces and makes surface contact with the dog clutch 141 of the trailer 40, so that the teeth of both dog clutches 141 and 235 are coupled to each other, enabling power transmission. It becomes.

Thereafter, the outrigger 100 is lifted upward and the trailer 40 is towed away from the ground, and after towing or during the towing process, the power of the tractor 1 is transferred to the PTO shaft, power transmission unit 230, and both It is possible to operate the work machine by transferring it to the dog clutches 141 and 235, the joint 140 of the trailer 40, and the work machine.

Although the present invention has been described in detail through specific examples, this is for the purpose of explaining the present invention in detail, and the present invention is not limited thereto, and can be understood by those skilled in the art within the technical spirit of the present invention. It is clear that modifications and improvements are possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Tractor 10: Upper link
20: lower link 30: universal joint
40: trailer 41: towing rod
100: Outrigger 110: Vertical frame
111: upper pin 112: connector
113,114: Hitch part 115: Hitch pin
116,117: Through hole 118: Guide protrusion
118a: slope 120: horizontal frame
121: lower pin 130: support frame
131: support scaffold 140: joint
141: Dog clutch 200: Quick attachment
210: Frame 211: Upper hook
220: Slider 221: Lower hook
222: support frame 223: fixing pin
230: Power transmission unit 231: Output shaft
232: fixing plate 233: support pin
234: spring 235: dog clutch

Claims (7)

A trailer hitch device connected to and towed by an agricultural vehicle,
The trailer hitch device is equipped with an outrigger that is rotatably connected to and mounted on the trailer,
The outrigger is a trailer hitch device that is towed by being connected to the upper and lower hooks that rotate up and down in conjunction with the three-point link of the agricultural vehicle.
In claim 1,
The outrigger includes a vertical frame and a horizontal frame that protrudes on both sides of the vertical frame,
The vertical frame is provided with an upper pin on which an upper hook is mounted, and a hitch portion to which the trailer is rotatably connected,
A trailer hitch device equipped with lower pins on which lower hooks are mounted on both sides of the horizontal frame.
In claim 2,
A trailer hitch device equipped with downwardly inclined support frames on both sides of the horizontal frame so as to be supported in contact with the ground.
In claim 3,
A trailer hitch device in which the support frame is equipped with a support plate that is in parallel contact with the ground when in contact with the ground.
In claim 2,
A trailer hitch device that has hitch units on the front and rear sides of the vertical frame, allowing the trailer to be connected to an agricultural vehicle at a short or long distance apart.
In claim 2,
The trailer is equipped with a universal joint to provide power to the implement loaded on it, and the universal joint is equipped with a dog clutch that penetrates the vertical frame of the outrigger and is connected to the PTO shaft of the agricultural vehicle.
A trailer hitch device that is equipped to drive an implement loaded on a trailer with the power of an agricultural vehicle.
In claim 2,
A trailer hitch device in which guide protrusions are provided on the vertical frames on both sides of the upper pin, and the surfaces facing both guide protrusions are provided with inclined surfaces to guide the upper hook so that it can be coupled to the upper pin in the correct position.

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