JP3592915B2 - Tractor work equipment coupling device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission mechanism for disposing a connecting device for detachably connecting a working machine to a work mounting device mounted on a rear part of a tractor, and transmitting a signal for feeding back a change in working depth from the working machine simultaneously with attachment and detachment by the connecting device. Also can be attached and detached simultaneously.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a technique has been known in which a detachable hitch device is disposed at a rear portion of a work machine mounting device at a rear portion of a tractor so that the work machine can be easily attached and detached.
When attaching and detaching the work machine, the work machine mounting device and the power transmission mechanism can be attached and detached at the same time, but when performing tillage depth control using the rear cover as a sensor, feedback that transmits the amount of rotation of the rear cover is used. The wire (or a rod or the like for transmitting the movement amount of the rear cover) is attached to and removed from the tractor by an operator.
However, if the operator forgets to remove the connection portion of the feedback wire when removing the work implement, there is a problem that the feedback wire or the like is lost.
[0003]
In order to solve such a problem, a technique for automatically attaching and detaching a feedback wire or the like is known. For example, there is Japanese Utility Model No. 8-4815.
This divides the feedback wire back and forth, connects the front feedback wire that transmits to the tillage depth control unit to the swingable link on the tractor side, and pivots an interlocking pin on the ring.
On the other hand, a hook for receiving is formed on the swingable link on the working machine side, a wire on the rear side is connected to the link, a pin on the ring is engaged with the hook when the working machine is mounted, and a link on the tractor side is connected. And the link on the work implement side to transmit the operation amount of the rear cover.
Further, as in Japanese Utility Model Publication No. 4-48651, a roller provided on the swingable link on the tractor side is in contact with the side surface of the swingable link on the working machine side, and the link is swung like a cam. A technique for transmitting the amount of movement of the rear gabar is also known.
[0004]
[Problems to be solved by the invention]
However, in the technique disclosed in Japanese Utility Model Publication No. 8-4815, a certain amount of backlash is required for the pins on the link on the tractor side to smoothly enter and exit the receiving hook. This has the negative effect of
Furthermore, the pin on the link on the tractor side comes in and out of the hook while contacting the receiving link at the time of attachment / detachment.
[0005]
Further, in the technique disclosed in Japanese Utility Model Publication No. 4-48651, the amount of operation of the rear cover changes when the link is swung via a roller. A method of intentionally using this change for tillage depth control is also conceivable, but models using this method transmit the movement of the rear cover directly with a single feedback wire without using this automatic feedback wire attachment / detachment mechanism. There is a disadvantage that the tillage depth control is changed as compared with the model and the compatibility for each model is lost. In addition, there is also a problem that the till depth control is changed due to wear of the rollers.
[0006]
[Means for Solving the Problems]
The present invention is configured as follows in order to solve such a problem.
A connecting device 20 for detachably connecting a working machine is disposed on a work mounting device mounted on a rear part of the tractor, and a transmission unit for feeding back a working height from the working machine is disposed between the connecting device 20 and the working machine. The front swing link 51 is provided on the side of the connecting device 20, the rear swing link 60 is provided on the working machine side, and the front wire 40a and the rear wire 40b are connected to one end of each swing link. In a state where the working machines are connected, the other ends of the swing links are brought into contact with each other, and the fulcrum shaft 52 of the front swing link 51 on the connecting device 20 side and the fulcrum shaft of the rear swing link 60 on the working machine side. Reference numeral 62 denotes a connecting pin 54 of the front wire 40a provided on the front swing link 51 and a connecting pin 64 of the rear wire 40b provided on the rear swing link 60, which are arranged on the same axis in side view. Are also arranged on the same axis in side view, and A front wire 40a and the rear wire 40b is one that is located in a side view the same axis direction.
[0007]
[Embodiment of the present invention]
The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the configuration of the embodiment shown in the accompanying drawings will be described.
FIG. 1 is a side view showing a state where a rotary tilling device is removed using a connecting device, FIG. 2 is a side view showing a state where a rotary tilling device is mounted using a connecting device, and FIG. 3 is a connection configuration of wires of the present invention. , FIG. 4 is a partial plan view showing a state in which a rotary tilling device is mounted using a connecting device, FIG. 5 is a plan view showing a connecting structure of wires of the present invention, and FIG. 6 is a rear view of the same.
[0008]
1 and 2, a work implement mounting device including an upper link 1 and lower links 2 is attached to the rear of the tractor. A detachable connecting device 20 is disposed at the rear portions of the upper link 1 and the lower links 2.
The rotary tillage device 10 is mounted with one touch by using the connection device 20. The connection device 20 includes a bracket 21 pivotally supported at the rear portion of the lower link 2, an arch-shaped connection frame 22 fixed to the left and right brackets 21, and a fixed upper center portion of the connection frame 22. The front portion of the connection support member 23 is pivotally supported by the rear portion of the upper link 1.
A concave portion 23a is provided at a rear portion of the connection support member 23, and a mast pin 3a on an upper portion of the mast 3 of the rotary plow 10 is detachably engaged with the concave portion 23a.
[0009]
On the other hand, link pins 4a, 4a are horizontally provided at the front portions of the support plates 4, 4 provided on both sides of the gear box 5 of the rotary tillage device 10, and the link pins 4a are engaged in recesses formed at the rear portion of the bracket 21. Are combined. Further, a lower connecting rod 26 is provided laterally below the brackets 21 to reinforce the connecting device 20.
[0010]
An input shaft 24 projecting forward from the gear box 5 is connected to a not-shown claw clutch mechanism of the connecting device 20 via a universal joint 25 to a PTO shaft of the tractor via a universal joint 25. At the same time as the rotary tilling device 10 is mounted, the two-claw clutch mechanism is engaged so that power is transmitted to the gear box 5.
Power is transmitted from the gear box 5 to the chain case 6, and the tilling claws 7, 7... Fixed on the tilling claw shaft 8 laid under the chain case 6 can be driven.
[0011]
A front end of a depth frame 9 is pivotally supported on a rear portion of the support plate 4 arranged on both sides of the gear box 5 so as to be vertically rotatable, and another working machine, a tail wheel and the like are mounted on the rear end of the depth frame 9. It is possible.
Further, a support pipe 11 is provided laterally in the middle of the depth frame 9, a stay 12 is projected upward from the support pipe 11, and a screw rod 14 is interposed between the stay 12 and the upper rear part of the mast 3. The screw rod 14 is extended and contracted by the turning operation of the handle 15 so that the depth frame 9 can be turned up and down.
[0012]
A cultivation cover 16 is provided above the rotation locus of the cultivation claw 7, and a rear cover 17 is pivotally supported at a rear portion of the cultivation cover 16.
The cultivation cover 16 is pivotally supported about the cultivation claw shaft 8 and has a stay 13 projecting from the left and right central portions at the rear of the cultivation cover 16, and a screw rod 18 is provided between the stay 13 and the lower part of the mast 3. The till cover 16 and the rear cover 17 are rotated back and forth by turning the screw rod 18 by turning the handle 19, so that the till cover 16 and the rear cover 17 can be adjusted manually according to the desired plowing depth. I have.
[0013]
A lower portion of the guide rod 28 is pivotally supported at an upper and lower portion of the rear cover 17, while a sliding support bracket 29 is provided to project rearward and upward from a rear portion of the cultivation cover 16, and a boss portion is provided at the rear of the sliding support bracket 29. The guide rod 28 is slidably inserted into the boss portion 30 to guide the rear cover 17 against vertical movement.
[0014]
A base stay 31 is fixedly provided on the side of the slide support bracket 29, and a middle part of the sensing rod 32 is supported by the base stay 31 so as to be slidable up and down. The lower part of the sensing rod 32 is connected to a stay 33 projecting from the rear surface of the rear cover 17, and the sensing rod 32 is slid up and down as the rear cover 17 rotates up and down.
[0015]
A feedback wire 40 is connected between the rear cover 17 and the elevating hydraulic control device. The feedback wire 40 is housed in the outer case 41 and protected. Then, the feedback wire 40 and the outer case 41 are divided into front and rear wires 40a, 40b, 41a, 41b by a transmission portion 39 provided in the connecting device 20.
[0016]
The rear end of the outer case 41b is fixed to the base stay 31, and the rear end of the feedback wire 40b is connected to the upper part of the L-shaped bent sensing rod 32. The feedback wire 40b between the upper surface of the base stay 31 and the upper part of the sensing rod 32 is covered by a bellows-like case 42, and foreign matter such as mud and dust adheres to the end of the feedback wire 40, and foreign matter is contained in the outer case 41b. Infiltration is prevented, and sliding of the feedback wire 40b in the case 42 is kept smooth.
[0017]
The front end of the outer case 41a for accommodating the feedback wire 40a is fixed to a pivot 1a pivotally supporting the front portion of the upper link 1. A pivot arm 43 is pivotally supported on the side of the pivot 1a. The front end of the feedback wire 40a is connected to the end of the arm 43. An interlocking arm 44 is fixedly mounted on the base of the pivoting arm 43, and the interlocking arm 44 is interlockingly connected to a hydraulic control valve of a hydraulic cylinder device that drives the work implement mounting device up and down.
[0018]
As shown in FIGS. 3, 5, and 6, the transmission portion 39 of the present invention has a fulcrum shaft 62 projecting rightward from the left support plate 4 in the traveling direction of the rotary tillage device 10, and An intermediate portion of the rear swing link 60 is pivotally supported by the shaft 62, and the rear swing link 60 is formed in an inverted “C” shape around the pivot position of the fulcrum shaft 62.
[0019]
A toggle spring 65 is wound on the outer peripheral surface of the fulcrum shaft 62, one end of the toggle spring 65 is fixed on the fulcrum shaft 62, and the other end is locked to the rear swing link 60. Is biased so as to rotate forward (counterclockwise in a side view shown in FIG. 3).
In addition, a regulating plate 66 projects rightward from the upper rear part of the support plate 4, and the rear surface of the rear swing link 60 abuts on the regulating plate 66 to restrict the rotation of the rear swing link 60. Are arranged obliquely from front to back and then back to high.
[0020]
The upper and rear portions of the rear swing link 60 are bent into an L shape (right side) in plan view to form a contact piece 60a, and form a contact surface with a rear swing link 51 described later. Further, the plane including the contact piece 60a is disposed so as to face in the radial direction with respect to the fulcrum shaft 62.
[0021]
The lower portion of the rear swing link 60 extends forward and downward, and the lower end of the rear swing link 60 is pivotally connected to the front end of the rear wire 40b via a connecting pin 64. The front end of the outer case 41b that supports the rear wire 40b is fixed to a stay 63 that projects rightward from the lower rear part of the support plate 4.
[0022]
On the other hand, the front swing link 51 that swings by contacting the rear swing link 60 is rotatably supported by a fulcrum bracket 50 erected on the lower connecting rod 26 on the connecting device 20 side. That is, a fulcrum shaft 52 protrudes rightward from the rear upper portion of the fulcrum bracket 50, and a middle portion of the front swing link 51 is pivotally supported by the fulcrum shaft 52. When the fulcrum shaft 52 is connected, the fulcrum shaft 52 and the fulcrum shaft 62 Are arranged on the same axis.
[0023]
The front swing link 51 is formed in an inverted "C" shape around the pivotal position of the fulcrum shaft 52 as viewed from the side as shown in FIG. 3, and the front swing link 51 is formed by the rear swing link. 60 are formed so that the lengths in the up-down direction and the front-back direction are substantially equal. A toggle spring 55 is externally fitted on the outer peripheral surface of the fulcrum shaft 52, one end of the toggle spring 55 is fixed to the fulcrum shaft 52, and the other end is locked on the upper front surface of the front swing link 51. Are biased so as to rotate backward (clockwise in the side view shown in FIG. 3).
[0024]
Further, a plate body 56 projects rightward from the middle of the fulcrum bracket 50 in the front-rear direction, and the plate body 56 is provided with a contact position adjusting mechanism. That is, the adjuster bolt 57 is screwed into the plate 56 and the plate 56 is disposed in front of the front swing link 51, so that the end of the adjuster bolt 57 is located halfway in front of the front swing link 51. The parts are in contact.
Therefore, the front swing link 51 is biased by the toggle spring 55 so as to rotate clockwise in FIG. 3, but the rotation is restricted by contacting the adjuster bolt 57, and the screwing operation of the adjuster bolt 57 causes the front swing link 51 to rotate. The angle of contact with the rear swing link 60 can be adjusted. However, the contact position adjusting mechanism can be provided on the working machine side.
[0025]
Further, a wire support stay 53 projects forward from an upper and lower portion of the fulcrum bracket 50, and a front portion of the wire support stay 53 is bent into an L shape, and a rear portion of the outer case 41a is fixed to this portion. .
[0026]
The lower part of the front swing link 51 extends forward and downward, and the rear end of the front wire 40a is connected to the lower end of the front swing link 51 by a connecting pin 54. The distance between the connecting pin 54 and the fulcrum shaft 52 is formed equal to the distance between the connecting pin 64 of the rear swing link 60 and the fulcrum shaft 62. The exposed portion of the front wire 40a is covered by a bellows-like case 58.
[0027]
Further, the upper front portion of the front swing link 51 is bent into an L shape in plan view to form a contact piece 51 a, and a plane including the contact piece 51 a is formed to be in a radial direction of the fulcrum shaft 52. . As shown in FIG. 6, the contact piece 51a is disposed so as to overlap with the contact piece 60a in a rear view.
[0028]
In such a configuration, when the rotary tilling device 10 is mounted on the work implement mounting device, the tractor is moved backward while the work implement mounting device is lowered, and the concave portion 23a of the connection support member 23 is located below the mast pin 3a of the mast 3. When the work implement mounting device is raised in this state, the mast pin 3a is engaged with the concave portion 23a. When the work device mounting device is further raised, the link pins 4a, 4a are pivotally inserted into the concave portions at the rear portions of the brackets 21, 21. The rotary tilling device 10 is mounted on the connecting device 20.
[0029]
At this time, the front swing link 51 and the rear swing link 60 are substantially wrapped in a side view, and the rear face of the contact piece 51a and the front face of the contact piece 60a are in contact with each other. And can be interlocked. In this position, the connecting pin 54 and the connecting pin 64 below the front swing link 51 and the rear swing link 60 are arranged on the same axis in a side view, and the front swing link 51 and the rear swing link 60 The amount of rotation is equal.
Further, the front wire 40a and the rear wire 40b are arranged on the same axis when viewed from the side, and the wire 40 is divided into two parts.
[0030]
Then, at the time of the tilling operation, the rear cover 17 rotates with the change of the backward movement. For example, when the rear cover 17 is rotated upward and the rear wire 40b is pulled, the rear swing link 60 is rotated counterclockwise around the fulcrum shaft 62, and the front surface of the contact piece 60a is rotated by this rotation. The front swing link 51 is turned around the fulcrum shaft 52 in the same direction as the rear swing link 60 in the same direction as the rear swing link 60, and the front wire 40a is equal in length to the rear wire 40b. Then, it is pulled and fed back to the hydraulic control valve in the same way as with a single feedback wire.
[0031]
Also, when the transmission part 39 rotates, the contact piece 51a and the contact piece 60a are rotated while contacting with each other, so that the contact piece 51a and the contact piece 60a do not rub against each other. The amount of rotation of 17 is transmitted accurately. Further, since the contact surface between the contact piece 51a and the contact piece 60a is provided in the radial direction of the fulcrum shaft 52 (or 62) and at right angles to the direction of rotation with the front swing link 51, it is ensured. It is turned.
[0032]
【The invention's effect】
With the configuration described above, the present invention has the following effects.
That is, a feedback wire is connected to one end of each swing link , and the other ends of the swing links are brought into contact with each other. Therefore, when the working machine is removed from the connecting device, the transmission unit is also removed at the same time, and it is necessary to work down the tractor. It is functional and does not forget to remove it, and there is no problem such as damage to the feedback wire.
Also, since the other ends of the oscillating links are in contact with each other, even when used for many years, there is no backlash due to wear, etc., and the displacement of the means for detecting the height of the working machine can be accurately transmitted. Can be.
[0033]
In a state where the working machines are connected, the swinging fulcrum of the swinging link on the working machine side and the swinging fulcrum of the swinging link on the connecting device side are arranged on the same axis in a side view. The fastening position of the wire was set to the same position in side view, and the amount of rotation of both swing links was equal, so that the wiring of the wire was not complicated, and the handling of the wire was refreshing like a single wire, Excellent in design.
Also, since the amounts of rotation of the two swing links are equal, the displacement of the means for detecting the contact height of the contact work machine is transmitted to the mechanism for lifting and lowering in the same manner as transmitted by a single wire. Therefore, the same hydraulic control device as that of the model that directly transmits the movement of the rear cover with one wire can be used, and the compatibility of each model can be maintained.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a rotary tilling device is removed using a connecting device.
FIG. 2 is a side view showing a state in which a rotary tilling device is mounted using a connecting device.
FIG. 3 is a side view showing a wire connection configuration of the present invention.
FIG. 4 is a partial plan view showing a state where the rotary tilling device is mounted on the connecting device.
FIG. 5 is a plan view showing a connection configuration of wires according to the present invention.
FIG. 6 is a rear view of the same.
[Explanation of symbols]
10 Rotary tillage equipment (grounding machine)
Reference Signs List 20 coupling device 40 feedback wire 40a front wire 40b rear wire 51 front swing link 51a contact piece 52 fulcrum shaft 60 rear swing link 60a contact piece 62 fulcrum axis

Claims (1)

A connecting device 20 for detachably connecting a working machine is disposed on a work mounting device mounted on a rear portion of the tractor, and a transmission unit for feeding back a working height from the working machine is disposed between the connecting device 20 and the working machine. Configuration,
A front swing link 51 is provided on the side of the connecting device 20, a rear swing link 60 is provided on the working machine side, and a front wire 40a and a rear wire 40b are connected to one end of each swing link.
With the work equipment connected, the other ends of the swing links are brought into contact with each other,
The fulcrum shaft 52 of the front swing link 51 on the connecting device 20 side and the fulcrum shaft 62 of the rear swing link 60 on the work implement side are arranged on the same axis in a side view.
Further, the connecting pin 54 of the front wire 40a provided on the front swing link 51 and the connecting pin 64 of the rear wire 40b provided on the rear swing link 60 are also arranged on the same axis in side view,
The front wire 40a and the rear wire 40b are arranged in the same axial direction when viewed from the side .

Images