JP2871255B2 - Work implement detection device for tractors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hitch frame connected to a rear portion by a top link and a lower link, a work machine being detachably mounted on the hitch frame, and transmitting a displacement of the work machine to a detection mechanism of a tractor. The present invention relates to a work implement detection device for a tractor.

[0002]

2. Description of the Related Art Conventionally, when a hitch frame is connected to a rear portion of a tractor by a top link and a lower link, a work machine is detachably mounted on the hitch frame, and a yoke is transmitted from the PTO shaft of the tractor to the work machine. It is already known to support the rear part of the joint with a hitch frame and to transmit the displacement of the working machine to a detection mechanism mounted on a tractor by a wire.

[0003]

In the known detection device for a tractor, the wire for transmitting the displacement of the work machine to a detection mechanism mounted on the tractor is parallel to the front-rear direction of the machine body. When raising or lowering the wire, the slackness of the wire changes, which may cause it to be pinched or caught by other mechanisms.To eliminate such a phenomenon, it is necessary to attach a guide to the wire. there were.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a yoke joint for connecting a hitch frame to a rear portion by a top link and a lower link, detachably connecting a working machine to the hitch frame, and transmitting the working machine from the PTO shaft to the working machine. The rear part is supported, and at least two types of displacement of the work machine are transmitted to separate detection mechanisms mounted on the tractor. Arranged and attached to the left and right sides of the hitch frame are driven members which are linked to the respective driving members when the work machine is attached / detached, and these driven members are crossed obliquely and oppositely on the respective yoke joints to the respective detection mechanisms. The above-mentioned problem was solved by interlocking and linking via a wire.

[0005]

When the work machine is attached to and detached from the hitch frame, the drive unit on the work machine is disengaged from the driven body of the hitch frame. Then, since at least two wires interlockingly linking the left and right driven bodies and the detection mechanism mounted on the tractor intersect on the yoke joint, when the work machine is moved up and down, both wires, or one of the two wires, Even if the wires are loosened unevenly,
It is supported by the yoke joint and can always and accurately transmit the displacement of the working machine without being caught or pinched by other equipment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. Reference numeral 1 denotes a tractor transmission case, and a top link bracket 2 attached to a lower portion and an upper portion thereof has a top link 3 and a lower link. The hitch frame 5 is connected to the lower arm 4 via a lift rod, and the lift arm 6 is connected to the lower link 4 through a lift rod. It is interlocked and connected to the input shaft of the rotary cultivator 10 serving as a working machine via the power tool.

[0007] The rotary tiller 10 is provided with a rotary cover 1 for covering the upper surface of the rotation trajectory of a tilling claw mounted on a tilling shaft.
1, the rear ends of which are fixed to the horizontal frame 12, and the rotating rails 13, 13 having an arc shape in a side view are fitted to the guide rollers on the rotary cover 11 so that they can be rotated back and forth.
An upper portion of a rear cover 15 is pivotally mounted on the rear surface of the horizontal frame 12 so as to be vertically rotatable, and a lower portion of a lifting cylinder 17 with an electric motor 16 having an upper end pivotally supported by a top mast 14 is connected to an intermediate portion of the horizontal frame 12. When the electric motor 16 is rotated in the forward and reverse directions, the elevating cylinder 17 expands and contracts, so that the rotating rails 13 and 13 and the horizontal frame 12 are integrally rotated back and forth, whereby the rear cover 15 is moved obliquely. To go up and down.

A bracket 18 erected on the rear surface of the rear cover 15 is attached to the rear end of the bending link 20 by the rod 2.
1, a pipe frame 24 rotatably connected and extending laterally from a side surface of a gear case 22 having the input shaft.
A plate 24a protrudes from the front surface of the arm, and the plate 24a pivotally supports an intermediate portion of the cultivating depth drive arm 25. The lower end of the cultivation depth drive arm 25 The rear of the gear case 22 is connected by a wire 27 made of a push-full wire which is formed in an S-shape in plan view and detoured, and a torsion spring 28 is provided at the pivot portion for urging the wire 27 in a direction in which the wire 27 is extended. Therefore, when the rear cover 15 is turned up and down due to a change in tillage depth, the tillage depth drive arm 25 is accurately turned forward and backward in the front-rear direction.

The lower end connecting member of the hitch frame 5 includes:
The rear part of the yoke joint 8 is supported by a box-shaped bracket 30 fixed at the center thereof. The upper part of the rear part of the mounting plate 34 fixed to one side of the bracket 30 is bent outward. The tillage drive arm 25
A tillage driven arm 32 rotatably supported by an upper portion of the transmission shaft is rotatably supported, and a tillage depth wire 33 having a front end connected to a lower end thereof diagonally crosses over the yoke joint 8 and a front end of the transmission case 1 It is mounted on the other side and is connected to a tillage depth detector 35 composed of a potentiometer.

Next, a device for detecting the amount of vertical movement of the rear cover 15, that is, the supporting height, will be described. A pipe 36 is provided upright on the horizontal frame 12 and extends from the gear case 22 to the other side. The lower end of an upward / downward drive arm 39 forming an inverted L-shape on a plate 37 integrated with the front surface of the
It is pivoted at 0 and its upper end is interlockingly connected to the receiver 36 via a rod 38. At the rear of the mounting plate 42 fixed to the other side of the bracket 30, the upper end is bent outward and the intermediate portion of the lift driven arm 43 engaged with the lift drive arm 39 is supported by a support shaft. A height detector 41 rotatably supported and comprising a potentiometer mounted on the opposite side of the transmission case 1;
The lower part of the plowing wire 3 on the yoke joint 8
The lifting wire 45 and the plowing wire 33 are connected to each other by a lifting wire 45 that crosses in an X-shape, and can be shared. Therefore,
When the electric motor 16 rotates forward and backward and the elevating cylinder 17 expands and contracts, the rotating rails 13 rotate back and forth, and accordingly the rear cover 15 moves up and down, and at the same time, the rod 38 moves back and forth. When the drive arm 39 rotates the lift driven arm 43, and the lift driven arm 43 rotates following the drive arm 39, the lift wire 45 activates the height detector 41.

A plate 51 fixed to the side surface of the gear case 22 is provided with a socket 50 of a harness 53 for transmitting electric power to the electric motor 16, and is screwed to the side surface of the bracket 30 to project upward. The other socket 52 fixed to the socket 50 corresponds to the socket 50, and the socket 52 is connected to a battery mounted on the tractor main body by a harness 54. The socket 52 has a rubber plate 58 mounted on a joint end side. 2 terminals (+-) connection terminals 5 that are waterproof and mudproof
The two-pole pins 56, 56, which are provided so as to be able to advance and retract into the front part of the box-shaped main body of the socket 50, are urged by springs 57, 57.

When the rotary tiller 10 is mounted on the hitch frame 5, the top hook 60 of the hitch frame 5 is hung on the pin at the upper end of the top mast 14 and raised.
The rotary cultivator 10 rotates forward around the pin, the lower hooks 61 on both lower sides of the hitch frame 5 are fitted to the lower pins, and the lock hooks 62 rotate downward from above to be in a locked state. Conversely, when removing the rotary cultivator, the lock hook 62 is disengaged from the connecting pin by operating the lock lever 62a, and is lowered from the rising state onto the ground, so that the connecting pin comes out of the lower hook 61. When the work machine is attached or detached, the working depth drive arm 25 is
2, the lifting drive arm 39 is disengaged from the lifting driven arm 43, and the socket 50 is disengaged from the socket 52, all of which are largely separated from the connecting portion of the lower hook 61, which is a connecting tool. And there is no hindrance to the coupling operation. Further, when the rotary tiller 10 is moved up and down each time when the work machine is attached or detached, or when the machine is circulating, the slack of the plowing wire 33 and the lifting wire 45 changes.
Are placed on the yoke joint in an intersecting state, so that they are not caught or pinched by other devices, and can be maintained in a freely operable state. In addition, brackets, wires, and other constituent members can be formed in the same shape for a plurality of systems and shared.

In the above embodiment, the detection mechanism is constituted by a potentiometer and can be applied to microcomputer control. However, when the valve of the hydraulic cylinder for lift is mechanically controlled, as shown in FIG. A relay swing arm 65 is pivotally supported via a bracket 63 at or near the position where the detection mechanism is mounted, and the lower end thereof is connected to the front end of the plowing wire 33 (the other side is a lifting wire 45). The upper end is linked to the valve arm by a rod 64, and the arm ratio of the relay swing arm 65 is set so that the wire 33 (or 45) can be pulled at a substantially constant amount with respect to the microcomputer control method. Can also be applied to the mechanical control method, and other devices can be the same.

[0014]

According to the present invention, as described above, the hitch frame 5 is connected to the rear portion by the top link 3 and the lower link 4, and the work machine is detachably connected to the hitch frame 5 and the work machine is connected to the PTO shaft 7 from the PTO shaft 7. A rear part of the yoke joint 8 for transmitting the working machine, and transmitting at least two kinds of displacements of the working machine to separate detection mechanisms mounted on the tractor. It is disposed on the left and right of the front part of the machine, and on the left and right sides of the hitch frame 5, attached to the yoke joint 8 are attached followers that are interlocked with the drivers when the work machine is attached and detached. Since it is interlocked and connected via a wire that crosses obliquely and in the opposite direction, even if the work machine is repeatedly lifted and lowered when the work machine is attached or detached or when the machine circulates, the detection mechanism that attached the displacement of the work machine to the tractor body Biography Wire yoke joint 8
By this, it is possible to reliably prevent the wire from being caught or pinched by another device while maintaining a substantially constant stable relationship, and to support both wires by the yoke joint 8 in a crossed state as described above. Thus, the cost can be reduced by omitting the wire guide.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor having a rotary tiller connected to a rear portion.

FIG. 2 is a plan view omitting a front part of the same.

FIG. 3 is a plan view showing a state where the working machine is connected to a hitch frame.

FIG. 4 is a plan view showing a state where the battery is removed.

FIG. 5 is a side view of the lifting transmission system.

FIG. 6 is a side view of the tillage transmission system.

FIG. 7 is a front view of a connecting portion.

FIG. 8 is a sectional view of front and rear sockets.

FIG. 9 is a side view of the mechanical transmission means.

[Explanation of symbols]

 Reference Signs List 5 hitch frame 10 rotary tiller 11 rotary cover 12 horizontal frame 15 rear cover 17 elevating cylinder 25 plowing drive arm 27 wire 28 torsion spring 32 plowing depth driven arm 33 plowing wire 35 plowing depth detector 39 lifting drive arm 41 Height detector 43 Passive lifting arm 50 Socket 52 Socket 62 Lower hook 62a Lock lever

Claims (1)

(57) [Claims] 1. A hitch frame 5 is connected to a rear portion by a top link 3 and a lower link 4. A work machine is detachably connected to the hitch frame 5, and a rear portion of a yoke joint 8 is transmitted from the PTO shaft 7 to the work machine. And transmitting at least two types of displacements of the working machine to separate detection mechanisms mounted on the tractor, wherein a driving body operated by the displacement is disposed on the front left and right of the working machine. Then, on the left and right sides of the hitch frame 5, followers which are interlocked with the respective drivers when the work machine is attached / detached are mounted, and these followers are crossed obliquely and oppositely on the yoke joint 8 by the respective detection mechanisms. A work implement detection device in a tractor, wherein the work implement detection device is linked and connected via a wire.