JPH07114565B2 - Tractor-carrier connection device - Google Patents

Description

The present invention relates to a coupling device for a tractor and a carrier.

(Prior Art) In general, a rear end of a tractor is provided with a vertically projecting three-point link mechanism, and various work machines are replaceably connected to the rear end of the three-point link mechanism. The three-point link mechanism is composed of a top link and a pair of left and right lower links, and when the rotary cultivator is connected to the three-point link mechanism, the top link has a longitudinal direction of the lower link in order to obtain a high ground clearance of the cultivator. It is pivotally attached to a bracket that is fixed to the tractor at the intermediate position.In addition to this, a connecting body is provided on the rear end side of the three-point link mechanism, and the three-point link mechanism is raised so that the center of the connecting body is increased. By engaging the upper engaging part of the upper part with the upper connecting part of the cultivator side from below, and by making the lower engaging parts of the left and right lower parts of the connecting body relatively close to the lower connecting part of the cultivator side, Some are designed to be linked.
Further, a shaft connecting mechanism is provided at the center of the connecting body, and the yoke at the other end of the universal joint whose one end is connected to the PTO shaft is rotatably provided in the shaft connecting mechanism to connect the working machine. When connecting to the body, the input shaft of the working machine is automatically connected to the yoke at the other end of the universal joint (see Japanese Utility Model Application No. 62-221721).

(Problems to be Solved by the Invention) By the way, when a container containing heavy crops such as onions and potatoes is loaded and carried out in a wet field or a field with unevenness, traveling on a light four-truck, etc. Since it is difficult to carry out, transportation using a tractor is advantageous. However, when the carrier is connected to the tractor via a conventional connecting device, the container is loaded on the carrier bed of the carrier, and the three-point link mechanism is raised,
There is a problem that the loading platform tilts forward and the load collapses. In addition, when the spreader etc. driven by power from the PTO shaft is mounted on the carrier bed of the carrier, power can be taken out to the carrier side via the shaft connecting mechanism in the central part of the connecting body. It is necessary to do so.

Therefore, it is an object of the present invention to provide a tractor-carrier connecting device that solves the above problems.

(Means for Solving the Problem) Technical means taken by the present invention to achieve the above-mentioned object are a pair of left and right lower links 8 pivotally attached to the tractor 1, and a tractor 1 which is shorter than the lower links 8. A connecting body 11 for connecting the carrier 12 is provided on the tip end side of a vertically movable three-point link mechanism 5 composed of a top link 7 pivotally attached to the center of the connecting body 11. The upper engaging portion 37 of the upper portion is engaged with the upper connecting portion 30 of the carrier 12 from the lower side, and the lower engaging portions 40 of the left and right lower portions of the connecting body 11 are connected.
In a tractor-carrier connecting device configured to pivotally connect both to a lower connecting portion 32 on the carrier 12 side by being relatively close to each other, a mounting frame 22 having a lower side pivotally attached to the carrier 12 is provided, The upper connecting portion 30 is provided on the upper portion of the mounting frame 22.
And the lower link 8 is moved vertically so that the carrier 12 is moved up and down while the tractor 1 and the carrier 12 are connected to each other via the three-point link mechanism 5 and the connecting body 11. The point is that the tractor and the carrier 12 are detachably connected by a connecting rod 52 that constitutes a parallel link mechanism with and.

Further, the carrier 12 is provided with a spring 27 for urging the mounting frame 22 to stand upright, and the mounting frame 22 is provided with
It is preferable to provide a stopper 28 that abuts to maintain the standing state.

(Operation) At the time of connecting the carrier 12 to the tractor 1, the three-point link mechanism 5 is moved upward so that the upper engaging portion 37 of the central upper portion of the connecting body 11 is moved.
When the upper coupling portion 30 of the carrier 12 side is engaged from the lower side,
The lower engaging portions 40 on the lower left and right sides of the connecting body 11 are connected to the lower connecting portion 32 on the carrier 12 side so that they are relatively close to each other. And
When the tractor 1 and the carrier 12 are connected by the connecting rod 52, the carrier 12 moves up and down in parallel by the up and down movement of the three-point link mechanism 5. At this time, the upper connecting portion 30 engaged with the upper engaging portion of the central upper portion of the connecting body 11 is provided on the upper portion of the mounting frame 22 pivotally attached to the carrier 12 on the lower side, and the mounting frame 22
Swings to allow the carrier 12 to move up and down in parallel. Further, the carrier 12 is provided with a spring 27 that urges the mounting frame 22 to stand up, and the mounting frame 22 is provided with a stopper 28 that abuts so as to maintain the standing state. Mounting frame 22 during movement and storage when separated from the point link mechanism 5
Does not interfere.

When the rotary cultivator is connected to the three-point link mechanism 5, the connection rod 22 can be detached and used as before.

(Example) Hereinafter, the Example of this invention is described based on drawing. In FIG. 1, 1 is a tractor, 2 is its vehicle body, and a hydraulic device 4 having a pair of left and right lift arms 3 is mounted on the rear portion of the vehicle body 2. A three-point link mechanism 5 and a PTO shaft 6 are provided at the rear end of the vehicle body 2 so as to project rearward.

The three-point link mechanism 5 is composed of a top link 7 and a pair of left and right lower links 8. Each lower link 8 is pivotally attached to the lower end of the vehicle body 2 via a pin 62 and is connected to each lift arm 3 by a lift rod 9. Has been done. The top link 7 is pivotally attached to a bracket 10 fixed to the vehicle body 2 at an intermediate position in the front-rear direction (longitudinal direction of the link) of the lower link 8. A connecting body 11 is provided at the rear end of the three-point link mechanism 5, and a carrier 12 is detachably connected to the connecting body 11.

The carrier 12 has a loading platform 13 having a rectangular shape in plan view.
A fixed wheel 14 for traveling and a swing wheel 15 are provided on the lower side of each of the left and right pairs, respectively. A pair of vertical frame members 16 are erected on the left and right sides of the front end of the loading platform 13, and these vertical frame members 16 are connected by an upper pipe 17 and a lower pipe 18 which are horizontally stretched between the vertical frame members 16. Further, the vertical frame members 16 are connected by a connecting member 19. A connecting pin 21 is supported between a pair of left and right brackets 20 fixed to the center of the upper pipe 17 in the left-right direction. The lower pipe 18 is provided with a mounting frame 22 at a position corresponding to the connecting body 11, and the mounting frame 22 is
As shown in FIGS. 2 and 3, it has a mountain shape in a front view, and a space portion 23 is formed in the central portion. The left and right ends of the mounting frame 22 are pivotally connected to a pair of brackets 24 fixed to the lower pipe 18 via pins 25, whereby the mounting frame 22 is rotatable around the pins 25. Has been done. Further, the mounting frame 22 is biased rearward by a spring 27 mounted between the frame 22 and a support plate 26 fixed to the lower pipe 18, and its rotation is restricted by a stopper 28, so that the tractor 1 is prevented from moving. Will be held in a standing position when leaving. A normal connecting portion 30 formed of a pin is provided on the central top portion of the mounting frame 22 via a bifurcated bracket 29. On both left and right sides of the mounting frame 22, lower connecting portions 32 formed of pins are provided via brackets 31 protruding forward from the lower pipe 18.

As shown in FIGS. 5 and 6, the connecting body 11 has a frame body 33 having a mountain shape in a front view, and a connecting member 34 is provided at a central top portion of the frame body 33. Bifurcated part 35 at the upper front
The rear end of the top link 7 is pivotally connected to the pin via a pin 36. At the rear of the connecting member 34, the upper connecting portion on the carrier 12 side is provided.
A hook-shaped upper engaging portion 37 which is detachably engaged with the lower portion 37
Are formed. Receiving members 38 are provided at both left and right ends of the frame 33, and the rear ends of the lower links 8 are connected to the receiving members 38 via pins 39. Further, the receiving member 38 has a carrier 12
A lower engaging portion 40 is formed which engages with the lower connecting pin 32 on the side in a detachable manner. Then, the upper engaging portion 37 of the connecting body 11 is located below the upper connecting portion 30 of the carrier 12, and the three-point link mechanism 5
Is raised, the upper engaging portion 37 engages with the upper connecting portion 30, and the lower engaging portion 40 of the connecting body 11 and the lower connecting portion 32 of the carrier 12.
And are engaged relatively close to each other.

The left and right receiving members 38 are provided with retaining means 41. The retaining means 30 has a lock pin 44, and the lock pin 44 is fitted into a cylindrical body 41 fixed on the receiving member 38 and a spring 43.
Thus, the lower connecting portion 32 is urged downward and enters the lower engaging portion 40 to prevent the lower connecting portion 32 from coming off. Also, the lock pin 44 is a spring
It is pulled up against 43 and retracts from the lower engaging part 40,
It is held at 45 by a restricting body 46 which is urged clockwise in FIG. The restricting body 46 is pushed by entering the lower engaging portion 40 of the lower connecting portion 32, and the holding of the lock pin 44 is released.

A holding body is attached to the center of the connecting body 11 via a mounting bracket 47.
48 is attached in a suspended manner, and an equipment cylinder 49 is loosely inserted in a circular hole formed in the holding body 48. This equipment cylinder 49 and holder
A coil spring 50 is interposed between the rear end portion 48 and the rear end portion on the compression side, and the equipment cylinder 49 is held so as to be swingable and movable in parallel. In the equipment cylinder 49, a yoke 51a at the front end is connected to the PTO shaft 6 of the tractor 1, and a yoke 51b at the rear end of the universal joint 51 is connected.
Is rotatably supported. When a work machine such as a spreader driven by the power from the PTO shaft 6 is mounted on the carrier 13 of the carrier 12, the work machine side on the carrier 13 is inserted through the space 23 of the mounting frame 22 of the carrier 12. To the universal joint 51
Power can be taken out from the rear end yoke 51b.

Further, by allowing the input shaft of the working machine mounted on the loading platform 13 to project from the space portion 23 of the mounting frame 22, the input shaft of the universal joint 51 is connected when the carrier 12 is connected to the connecting body 11. It can be automatically connected to the rear end yoke 51b. At this time, even if the center axis of the yoke 51b and the input shaft are deviated, the equipment cylinder 49 swings and translates to correct the deviation.

A connecting rod 52 is arranged above the three-point link mechanism 5, and the carrier 12 is also connected to the tractor 1 by the connecting rod 52. The connecting rod 52 is formed into a turnbuckle and is expandable and contractible, and the front end portion is detachably pivotally connected via a pin 53 to an extending portion 10a extending upward to a bracket 10 connecting the top link 7. Has been done. The rear end of the connecting rod 52 is pivotally connected to the connecting pin 21 of the upper pipe 17 of the carrier 12 by one-touch operation by lever operation. That is, as shown in FIG. 4, a connecting member 54 is provided at the rear end of the connecting rod 52.
The connecting member 54 is formed with an engaging recess 55 that engages with the connecting pin 21 from above in a disengageable manner, and enters into the engaging recess 55 so as to be orthogonal to the connecting pin 21. A restriction pin 56 that restricts the connection member 54 from being separated from the connection pin 21 is provided movably in the axial direction. The restriction pin 56 projects from the connecting member 54 and is supported and guided by an L-shaped guide plate 57,
A coil spring 58 interposed between the guide plate 57 and the restriction pin 56 urges the engaging recess 55 in a direction to enter the engaging recess 55. On the other hand, the lever 59 is pivotally attached to a support plate 60 fixed to a guide plate 57 so as to be vertically swingable, and is also connected to the front end of the restriction pin 56 by an arm 61. It is adapted to retreat from the inside of the engaging recess 55 against the biasing force of 58. Also, in side view,
The distance between the fulcrums 53, 21 of the connecting rod 52 is the fulcrum 62, 39 of the lower link 8.
When the three-point link mechanism 5 is moved up and down, the carrier 12 is moved up and down in parallel with the distance between them and the connecting rod 52 is arranged substantially parallel to the lower link 8. And move up and down. As a result, when a container or the like is loaded on the loading platform 13 and the carrier 12 is lifted to carry out an operation such as transportation, the container does not collapse. The connecting body 11
When the rotary cultivator or the like is mounted on, the connecting rod 52 may be removed.

(Advantages of the Invention) According to the present invention, the carrier 12 is provided with the mounting frame 22 pivotally attached to the lower side thereof, and the upper coupling portion 30 is provided on the upper part of the mounting frame 22, and the tractor 1 and the carrier 12 are provided.
A link forming a parallel link mechanism with the lower link 8 so that the carrier 12 moves up and down in parallel by raising and lowering the three-point link mechanism 5 in a state where and are connected via the three-point link mechanism 5 and the connecting body 11. Since the tractor and the carrier 12 are detachably connected by the rod 52, the containers and the like loaded on the carrier 12 do not become unbalanced when the carrier 12 is moved up and down, and the connecting rod 52 is removed to remove the connecting body 11. A rotary cultivator can be connected to the conventional rotary cultivator. Further, the carrier 12 is provided with a spring 27 for urging the mounting frame 22 so as to stand, and
By providing a stopper 28 that abuts the 22 in order to maintain its standing state, the effect that the mounting frame 22 does not interfere during movement and storage when the carrier 12 is separated from the three-point link mechanism 5. Play.

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a front view of a mounting frame, FIG. 3 is the same side view, and FIG.
FIG. 5 is a side sectional view of a device for attaching and detaching a connecting rod, FIG. 5 is a side view showing a connected state of the connecting device, and FIG. 6 is a front view of a connecting body. 1 ... tractor, 5 ... three-point link mechanism, 6 ... PTO
Shaft, 7 ... Top link, 8 ... Lower link, 11 ... Coupling body, 12 ... Carrier, 22 ... Mounting frame, 23 ... Space part, 30 ... Upper connecting part, 32 ... Lower connecting part , 37 ... upper engaging part, 40 ... lower engaging part, 52 ... connecting rod.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Ashiuchi 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd.Sakai Works Company Sakai Factory (72) Inventor Akio Hamada 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd. Sakai Factory (56) Reference JP 62-118807 (JP, A) Actual Development Sho 62-38964 ( JP, U)

Claims (2)

[Claims] 1. A pair of left and right lower links (8) pivotally attached to the tractor (1) and a top link (7) pivotally attached to the tractor (1) which is shorter than the lower links (8). A connecting body (11) for connecting the carrier (12) is provided on the tip side of the three-point link mechanism (5) which can be raised and lowered, and the three-point link mechanism (5) is lifted to move the connected body (11).
The upper engaging part (37) of the central upper part is engaged with the upper connecting part (30) of the carrier (12) from below, and the lower engaging parts (40) of the left and right lower parts of the connecting body (11) are attached to the carrier ( In a coupling device for a tractor and a carrier, which are pivotally connected to each other by making them relatively close to a lower connecting part (32) on the 12) side, a mounting frame (22) whose lower side is pivotally attached to the carrier (12). ), The upper connecting part (30) is provided on the upper part of the mounting frame (22), and the tractor (1) and the carrier (12) are connected to each other by a three-point link mechanism (5) and a connecting body (11). In order to move the carrier (12) up and down in parallel by raising and lowering the three-point link mechanism (5) while being connected via the tractor, the lower link (8) and the connecting rod (52) forming a parallel link mechanism form the tractor. And the carrier (12) are detachably connected to each other. Kuta and the coupling device of the carrier. 2. A carrier (12) is provided with a spring (27) for urging the mounting frame (22) to stand upright, and abuts against the mounting frame (22) so as to maintain its standing state. The tractor-carrier coupling device according to claim 1, further comprising a stopper (28).