JP3098131B2 - Tractor work equipment control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling a tractor working machine, more specifically, a position control, a traction control, and a traction / position mixing control.

[0002]

2. Description of the Related Art For example, a tractor is provided with a hydraulic device for lifting and lowering a working machine and a three-point link on which the working machine is mounted so as to be able to move up and down at the rear of a vehicle body. The working machine can be raised and lowered by turning the lift arm up and down.

Further, the hydraulic device is provided with a position control valve for switching the supply of pressurized oil to a hydraulic cylinder for rotating the lift arm so as to rotate the lift arm upward, stop, or rotate downward. A position lever that is linked and connected is provided, and by operating the lever, the working machine is raised and lowered, and the amount of rotation of the lift arm is fed back to the position control valve, and the working machine is raised and lowered in proportion to the amount of movement of the lever. In some cases, such position control can be performed. The lift arm rotating hydraulic cylinder is configured by a single-acting cylinder, and is configured to supply pressure oil when the lift arm is rotated upward.

Further, a draft control valve composed of a throttle valve is interposed in a hydraulic circuit between the position control valve and the hydraulic cylinder, and when the traction load is equal to or less than a set value, pressure oil flows from the draft control valve to the tank. When the traction load exceeds the set value, the spool of the control valve is pushed by the feedback mechanism interlocked with the traction load detection means, the port to the tank is closed, and the hydraulic oil is supplied to the hydraulic cylinder, There is a type in which traction force control that raises a work machine can be performed.

In this apparatus, a draft lever is interlockedly connected to the draft control valve, and the spool of the control valve moves in accordance with the amount of movement of the draft lever,
The amount of pressurized oil flowing to the tank and the amount of pressurized oil flowing to the hydraulic cylinder are adjusted, thereby setting the traction load.

[0006]

In the prior art, the traction force is controlled by the flow rate control using a throttle valve as a draft control valve, so that the pressure oil flow rate changes (fluctuations in engine speed). In addition, the sensitivity position of the draft fluctuates, and the pressure loss is large during the operation by the traction force control, which causes the oil temperature to rise and generate heat. Also,
When traction force control is being performed, position control cannot be performed, and there is a problem that the draft control valve is a cause of high cost.

Therefore, in order to solve these problems,
The above-mentioned conventional control device has been improved so that traction force control and traction force / position control can be performed using a position control valve, and a control device that can be retrofitted is attached to the application form of Japanese Patent Application No. 61-269405. There is a proposal in the specification and drawings, but in this case,
There is a problem that the number of parts is large, the structure is complicated, and it is difficult to assemble and disassemble.

SUMMARY OF THE INVENTION In view of the above problems, the present invention is a control device capable of performing tractive force control and tractive force / position control using a position control valve, and is a retrofittable control device. It is an object of the present invention to provide a tractor working machine control device that aims to simplify the structure.

[0009]

The technical measures taken by the present invention to achieve the above object are mounted on a vehicle body 2.
A control valve 11 for controlling lifting and lowering of the work machine 5;
Positive for controlling the position of the working machine 5 via the control valve 11
Work machine control device for tractor having shock lever 31
, An interlocking arm interlockingly connected to the control valve 11
37 is provided, and the position lever 31 is operated.
Pushes the interlocking arm 37 to raise the work machine 5
When a pressure member 35 is provided and a traction load acts on the work machine 5
And a working member 53 that swings,
Swing of the operating member 53 when a traction load exceeding a certain level is applied
The draft arm 41 which is pushed by and swings is provided,
The swing of the draft arm 41 causes the interlocking arm 3
A pressing member 42 is provided for raising the work machine 5 by pushing the work 7.
It is characterized by having.

In addition, the lifting and lowering of the working machine 5 mounted on the vehicle body 2
A control valve 11 for controlling, and a control valve 11
Lever 3 for controlling the position of the working machine 5
A working machine control device for a tractor comprising:
The interlocking arm 37 linked to the control valve 11 can swing freely.
And a swing operation of the position lever 31.
Pushes the interlocking arm 37 to raise the work machine 5
When a pressure member 35 is provided and a traction load acts on the work machine 5
And a working member 53 that swings,
Swing of the operating member 53 when a traction load exceeding a certain level is applied
The draft arm 41 which is pushed by and swings is provided,
The swing of the draft arm 41 causes the interlocking arm 3
7 is provided with a pressing member 42 for pushing up the work machine 5
Only, and characterized in that the position lever 31, the swing center of the interlock arm 37 and the draft <br/> Toamu 41 was the same axis
I do .

The working machine 5 mounted on the tractor 1
A control valve 11 for performing elevation control;
Lever for controlling the position of the working machine 5 through the
-31 and a working machine control device for a tractor comprising:
An interlocking arm 37 interlockingly connected to the control valve 11;
Operation of the position lever 31 and
Pressing member 35 that pushes arm 37 to raise work machine 5
And a pressing member 42 for pressing the interlocking arm 37 is provided.
And a draft arm 41 supported swingably,
Draft with one end pivotally connected to this draft arm 41
A link 44 is provided in the middle of the draft link 44.
In addition to providing the contact member 50, other than the draft link 44
Riff the end side via the draft feedback link 45
To the work arm 5 and a traction load acts on the work machine 5
A draft cam lever 53 that swings when the
Draft when a traction load more than the setting is applied to the industrial machine 5
The contact member 50 is pushed by the swing of the cam lever 53.
As a result, the draft link 44 is swung, and the draft
The draft arm 41 is swung by the swing of the link 44.
Then, the interlocking arm 37 is pressed by the pressing member 42,
The work machine 5 is configured to be raised by
And

[0012] Also, the hydraulic system 9 which enables lowering the working machine 5 mounted on the vehicle body 2 by the upper and lower pivot of the lift arm 10, a position lever 31 for controlling the position of the working machine 5, the working machine And a draft lever 29 for controlling the tractive force of the hydraulic control device 5. The hydraulic device 9 is provided with a control valve 11 for switching pressure oil so as to rotate the lift arm 10 upward, stop, or rotate downward. 11
And with interlocking connecting the position lever 31, tractor work machine control so as to fed back to the control valve 11 the amount of rotation of the lift arm 10 to raise and lower the working machine 5 in proportion to the amount of moving the position lever 31
In the apparatus, on the lever support shaft 28 for supporting the position lever 31 rotatably, the interlocking arm 37 which is operatively connected to the control valve 11 pivoting freely provided, the position lever 31 side, the lever 31 integral Swivel and interlock arm 3
7 is provided, and a pressing member 35 for raising the work machine 5 is provided.
Further, a pressing member 42 for pressing the interlocking arm 37 is provided.
And said lever pivoting on the support shaft 28 rotatably supported Dora
The Futoamu 41 provided, one end to the draft arm 41 is pivotally mounted, the draft links 44 with the contact member 50 to the middle APPLICATIONS portion provided, the other end of the draft links 44
A drive for feeding back the amount of rotation of the lift arm 10
Lift arm 1 via the lift feedback link 45
0, and is rotatable toward and away from the contact member 50 of the draft link 44 by the turning operation of the draft lever 29, and is also connected to the traction load detecting means to apply a traction load to the work machine 5. The work machine 5 is provided with a draft cam lever 53 that swings when
For swinging of the draft cam lever 53 when a load is applied
When the contact member 50 is pushed further, the draft link 4
4 is swung, and by the swing of the draft link 44,
The draft arm 41 is swung and the pressing member 42
The interlocking arm 37 is pushed, whereby the work machine 5 is raised.
It is characterized in that it is configured to be.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, a three-point link including an upper top link 3 and a lower left and right pair of lower links 4 is provided at a rear portion of a vehicle body (mission case) 2 of the tractor 1. 5 is attached. As shown in FIG. 1, a lower portion of a top link mounting base 6 for pivotally connecting the front end of the top link 3 is mounted on a bracket 8 fixed to the vehicle body 2 via a torsion bar 7 on the upper rear surface of the vehicle body 2. In addition, a top link sensing method that detects a traction load by a compressive force acting on the top link 3 is employed.

A hydraulic device 9 for lifting and lowering the working machine is mounted on a rear portion of the vehicle body 2, and the hydraulic device 9 has a front portion rotated by a hydraulic cylinder around a left-right axis as shown in FIG. A control valve 11 for controlling the hydraulic cylinder, comprising a pair of left and right lift arms 10 that are vertically turned.
It has. The distal ends of the left and right lift arms 10 are connected to the left and right lower links 4 via lift rods 12, so that the plow 5 can be moved up and down by the up and down rotation of the lift arms 10. The control valve 11 includes a three-position switching valve, and includes a spool 13 slidably inserted in the front-rear direction of the valve body against a return spring (not shown). The lift arm 10 can be switched between upward rotation, stop (neutral), and downward rotation. Here, the lift arm 10 when the lift arm 10 pushed the spool 1 3 from the neutral position is pivoted downward, withdrawn from the neutral position
Is rotated upward, and the lift arm 10 is stopped at the neutral position.

A joint block 1 is provided at the front end of the spool 13.
4 is provided rotatably around the front-rear axis, and an intermediate portion in the left-right direction of the spool operation bar 15 is pivotally mounted on the upper surface side of the joint block 14 so as to be rotatable about the vertical axis. The left end side of the spool operating bar 15 has a feedback lever shaft 16 having a lever connected to the end of the spool operating bar 15 via a spherical joint structure, a feedback arm 17 having an upper portion fixed to the feedback lever shaft 16, A feedback mechanism including a feedback rod 18 having a front end pivotally attached to a lower portion of the feedback arm 17 and a bracket 19 fixed to a pivot point of the left lift arm 10 and having a rear end pivotally attached to the rear end of the feedback rod 18 is provided. To the lift arm 10.

A control lever shaft 20 having a lever connected to the end of the spool operation bar 15 via a spherical joint structure is provided on the right end side of the spool operation bar 15.
Is provided. The shaft portion of the control lever shaft 20 projects rightward and outward from the housing of the hydraulic device 9,
As shown in FIGS. 1 to 3, a cylindrical shaft 21 is fixed to the projecting portion, and an upper portion of the control arm 22 is fixed to the cylindrical shaft 21.

The hydraulic device 9 behind the control arm 22
A mounting plate 23 is fixed to the outer surface, and a pair of front and rear cylinders 25 and 26 having a left-right axis is fixed to the mounting plate 23 via a bracket 24.
Lever support shafts 27 and 28 are respectively fitted inside and are rotatably supported around left and right axes. And the front lever support shaft 27
The lower end of a draft lever 29 is fixed to the outer end of the rear lever support shaft via a boss 30, and the lower end of a position lever 31 is fixed to the outer end of the rear lever support shaft through a boss 32.

A first cylindrical shaft 33 is externally fitted and fixed to the left side of the cylindrical body 26 of the rear lever support shaft 28, and an upper end of a position arm 34 is fixed to the first cylindrical shaft 33, and this position is fixed. The arm 34 is provided with a pressing pin (pressing member) 35 protruding leftward. In addition, the first of the rear lever support shaft 28
On the left side of the cylindrical shaft 33, a second cylindrical shaft 36 is fitted so as to be relatively rotatable.
The upper end of the interlocking arm 37 located on the front side of the
The link arm 37 is linked to the control arm 22 via a link rod 38. In addition, interlocking arm 3
7 and the lower end of the control arm 22
An auxiliary return spring 39 composed of a tension coil spring is provided.

[0019] The left side of the second cylindrical shaft 36 after the lever support shaft 28 is fitted freely third tubular shaft 40 is rotationally, the upper end of the draft arm 41 to the third cylindrical shaft 40 A pressing pin (pressing member) 4 is formed on the draft arm 41 so as to project rightward and contact the rear surface of the interlocking arm 37.
2 is fixed. A connecting pin 43 is fixed to the lower end of the draft arm 41 so as to project rightward.

A draft link 44 is vertically arranged between the rear lever support shaft 28 and the hydraulic device 9, and the rear end of the draft feedback link 45 is pivotally connected to the upper end of the draft link 44 via a pin 46. The front end side of the draft feedback link 45 is pivotally connected via a pin 48 to a bracket 47 fixed to a rotation fulcrum of the right lift arm 10. A pin 49 coaxial with the rear lever support shaft 28 is provided in the middle of the draft link 44 so as to project leftward. A roller 50 (contact member) is provided on the pin 49. It is externally fitted so as to be rotatable around the axis. Further, a cylindrical body 51 is provided at the lower end side of the draft link 44 so as to be rotatably fitted to the connecting pin 43 of the draft arm 41.

At the left end of the front lever support shaft 27, an arm 52 is provided.
The upper end of a draft cam lever (operating member) 53 is pivotally connected via a pin 54 to the upper end of the arm 52, and the rear end of a draft control rod 55 is pinned to the lower end of the draft cam lever 53. The front end of the draft control rod 55 is pivotally connected via a pin 58 to a bracket 57 fixed to the upper end of the top link mount 6.

First, a case where position control (position control) is performed in the above configuration will be described. When the position lever 31 is rotated backward from the state shown in FIG. 1 around the rear lever support shaft 28, the position arm 31 is moved together with the position lever 31 as shown in FIG.
4 rotates, and the interlocking arm 37 is pressed by the pressing pin 35 to rotate forward around the rear lever support shaft 28. As a result, the control arm 22 pivots forward through the connecting rod 38, and the right end side of the spool operating bar 15 is moved forward through the control lever shaft 20 so that the spool 1
3 is withdrawn.

When the spool 13 is pulled out, the lift arm 10 is rotated upward, the plow 5 is raised, and the feedback rod 18 is pulled backward , so that the spool operating bar 15 is moved through the feedback arm 17 and the feedback lever shaft 16. The left end moves backward and the spool 13
Is pushed. When the spool 13 is pushed in by the amount pulled out by the position lever 31, the spool 13 returns to the neutral position and the rotation of the lift arm 10 stops.

Further, the draft link 44 is pulled backward by the draft feedback link 45, and the connecting pin
It rotates around 43. It should be noted that, at this time, use of the working machine 5
Range of the state (that is, the state where the lift arm 10 is lowered)
Range), the position lever 31 is moved to the rear lever support shaft 28.
Also it is rotated backward around the roller 50 of the draft links 44 where located in the rear lever support shaft 28 and the same axis on
Does not deviate greatly.

Next, the position lever 31 is moved from the above state.
Is pivoted forward, the regulation of the position arm 34 by the pressing pin 35 is released, and the control arm 22 and the interlocking arm 37 are brought into contact with the pressing pin 35 by the spring force of the return spring of the control valve 11. The spool 13 is pushed in, and the lift arm 10 is pivoted downward to rotate the plow 5
Is lowered, and the spool 13 is returned to the neutral position by the feedback rod 18 or the like, and the lift arm 10
Stops rotating.

The come this and draft link 44 top is pushed forward by the draft feedback link 45, to a position indicating the position lever 31 in FIG. 1 described above
When the rotating operation is performed, the rollers 5 of the draft link 44
0 is located coaxially with the rear lever support shaft 28. In the position control, the plow 5 is moved in proportion to the amount of movement of the position lever 31 by the above operation.
Move up and down so that the plow 5 can be held at a position suitable for work. At the forefront end of the position lever 31 and its vicinity, the feedback mechanism does not operate, and the spool 13 is always pushed in from the neutral position. The plow 5 is lowered and released (this is called a floating state). ).

Next, the case where draft control (traction force control) is performed will be described. Position lever 3
1 is in floating position and draft lever 2
Reference numeral 9 denotes a draft sensing range between the forefront end (and its vicinity) indicated by a virtual line in FIG. 7 and the rearmost end (and its vicinity) indicated by a solid line. This will be described later. When a large load acts on the plow 5 from the state shown in FIG. 8, a compressive force acts on the top link 3, the torsion bar 7 is twisted, and the upper portion of the top link mount 6 swings forward, and the draft control rod 55 is pushed forward. When the draft control rod 55 is pushed forward, FIG.
As shown in the figure, the draft cam lever 53 rotates forward around the pin 54 to push the roller 50 of the draft link 44 forward, and the draft link 44 moves forward and interlocks via the draft arm 41 and the pressing pin 42. The arm 37 and the control arm 22 are pushed forward.

As a result, the spool 13 of the control valve 11
Is pulled out, the lift arm 10 is rotated upward, and the plow 5 is raised. As shown in FIG. 10, when the lift arm 10 rotates upward, the upper part of the draft link 44 is pulled backward via the draft feedback link 45, and the interlocking arm 37 and the control arm 22 are further rotated forward, and the plow 5 The plow 5 is raised until the large load acting on the plow is released.

When the large load acting on the plow 5 is released, the draft cam lever 53 returns to the original position and the regulation is released, and the control arm 22, the interlocking arm 37 and the draft arm 4 are returned by the return spring of the control valve 11. 1
But return to the original position, the plow 5 is lowered, the draft link
44 returns to the original position . In the draft control, the plow 5 is automatically raised when the tow load equal to or greater than the set tow load is applied to the plow 5 to perform the work with a constant tow load. ing. The adjustment of the traction load set by the draft control is performed by the draft lever 29.

That is, as shown in FIG. 7, by rotating the draft lever 29 around the front lever support shaft 27, the draft cam lever 53 swings around the front lever support shaft 27 and the rollers 50 of the draft link 44 are rotated. Approaching or moving away from
The distance between the draft cam lever 53 and the roller 50 changes, and the traction load on which the draft acts is adjusted. When the draft lever 29 is positioned at the frontmost end or a position in the vicinity thereof as shown by the imaginary line in FIG. 7, even if the top link mounting base 6 swings until it comes into contact with the rear side of the hydraulic device 9, the draft When the cam lever 53 does not push the roller 50, and when the draft lever 29 is located at the rearmost end or a position near the rear end as shown by a solid line in FIG. 7, the top link mount 6 does not swing. However, the roller 50 is pressed by the draft cam lever 53, the spool 13 is always pulled out from the neutral position, and the plow 5 is lifted and released.

When performing position control, the draft lever 29 is set at the dead zone position. In addition, by setting the position lever 31 in the work implement position settable area and the draft lever 29 in the tow load detectable area, the plow work is performed at the position determined by the position control when the set tow load is less than the set tow load, and the set tow load is larger than the set torsion load In this case, the draft control is activated, and the mix control (traction / position mixing control) in which the plow 5 is automatically raised can be performed.

[0032]

According to the present invention, in and one control valve can be equipped with retrofitted to preparative Rakuta, be one obtained by such position control, may perform traction control and traction and position control, moreover, the component A work machine control device with a small number of points and a simple structure can be provided.

[Brief description of the drawings]

FIG. 1 is a right side view of an upper rear portion of a vehicle body of a tractor.

FIG. 2 is a plan view of a rear part of the vehicle body of the tractor.

FIG. 3 is a plan sectional view of a main part of the control device.

FIG. 4 is a right side view of the tractor.

FIG. 5 is a perspective view of a hydraulic device.

FIG. 6 is a diagram illustrating the operation of position control.

FIG. 7 is an explanatory view of sensitivity adjustment of a traction load.

FIG. 8 is a diagram illustrating the operation of traction force control.

FIG. 9 is a diagram illustrating the operation of traction force control.

FIG. 10 is a diagram illustrating the operation of traction force control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 5 Plow (working machine) 9 Hydraulic device 10 Lift arm 11 Control valve 28 Lever shaft 29 Draft lever 31 Position lever 35 Press pin (Press member) 37 Interlocking arm 41 Draft arm 42 Press pin (Press member) 44 Draft link 45 Draft feedback link 50 Roller (contact member) 53 Draft cam lever

Claims (4)

(57) [Claims] A working machine (5) mounted on a vehicle body (2).
A control valve (11) for controlling lifting and lowering, and the control valve
For controlling the position of the working machine (5) via (11)
Tractor work machine with position lever (31)
In the control device, an interlocking arm (3) interlockingly connected to the control valve (11).
7) and operation of the position lever (31)
Pushes the interlocking arm (37) to move the work machine (5).
A lifting member (35) is provided to lift the work machine (5).
An operating member (53) that swings when a pulling load is applied is provided.
And a traction load greater than the set value acts on the work machine (5).
Is pushed by the swing of the operating member (53) when
A moving draft arm (41) is provided.
The interlock arm (37) is pushed by the swing of the arm (41).
A pressing member (42) for moving and raising the work machine (5) is provided.
A tractor working machine control device, characterized in that 2. A work machine (5) mounted on a vehicle body (2).
A control valve (11) for controlling lifting and lowering, and the control valve
For controlling the position of the working machine (5) via (11)
Tractor work machine with position lever (31)
In the control device, an interlocking arm (3) interlockingly connected to the control valve (11).
7) is provided swingably, and the position lever (3
By pushing the interlocking arm (37) by the swing operation of 1),
A pressing member (35) that raises the work machine (5) is provided.
Operating part that swings when a traction load acts on the industrial machine (5)
Material (53) and work machine (5)
Oscillation of the operating member (53) when a traction load acts.
A draft arm (41) that is pushed and oscillated is provided,
The swing arm of the draft arm (41) causes an interlocking arm.
Pressing part for pushing up the working machine (5) by pushing the arm (37)
A work machine control device for a tractor, comprising a member (42) and a center of swing of a position lever (31 ), an interlocking arm (37) and a draft arm (41). 3. A working machine mounted on a tractor (1).
(5) a control valve (11) for controlling the elevation and
Controlling the position of the working machine (5) via the control valve (11)
Of a tractor with a position lever (31) for
In the work implement control device, an interlocking arm (3) interlockingly connected to the control valve (11).
7) and operation of the position lever (31)
Pushes the interlocking arm (37) to move the work machine (5).
A lifting member (35) is provided to raise the interlocking arm (3).
7) It has a pressing member (42) for pressing and swinging freely.
A supported draft arm (41) is provided.
Draft link with one end pivotally attached to the arm (41)
(44), and in the middle of this draft link (44)
A contact member (50) and a draft link.
Connect the other end of (44) to the draft feedback link (4
5) Work linked with the lift arm (10) via
Draft that swings when a traction load is applied to the machine (5)
A cam lever (53) is provided, and the work machine (5)
Draft cam lever (53) when traction load is applied
The contact member (50) is pushed by the swing of the
The draft link (44) is swung, and this draft link is
The swing of (44) swings the draft arm (41).
The interlock arm (37) is moved by the pressing member (42).
To move the work implement (5) upward.
A work machine control device for a tractor, characterized in that: 4. A hydraulic device (9) capable of lifting and lowering a work machine (5) mounted on a vehicle body (2) by vertically rotating a lift arm (10), and controlling the position of the work machine (5). Lever (31), and a draft lever (29) for controlling the traction force of the work machine (5),
The hydraulic device (9) is provided with a control valve (11) for switching the pressure oil so as to rotate the lift arm (10) upward, stop, or downward, and the control valve (11) and the position lever (31). And a rotation amount of the lift arm (10) is fed back to the control valve (11) to raise and lower the work machine (5) in proportion to the amount of movement of the position lever (31). of the work machine control apparatus, the position lever (31) on the lever support shaft (28) which rotatably supports the, provided the interlocking arm which is operatively connected to the control valve (11) (37) rotating freely A pressure member (35) is provided on the side of the position lever (31) to rotate integrally with the lever (31 ) to push the interlock arm (37 ) to raise the work machine (5) ; In addition, in conjunction Over-time (37)
Pressing and the lever includes a pressing member (42) to the support shaft (28) rotating freely supported draft arm on (4
1) is provided, one end side is pivotally connected to the draft arm (41), provided with a draft link (44) having a contact member (50) in the middle APPLICATIONS portion, the other of the draft link (44)
The end side feeds back the amount of rotation of the lift arm (10).
Via the Draft Feedback Link (45)
It is connected to the lift arm (10) in an interlocking manner, and is rotatable toward and away from the contact member (50) of the draft link (44) by turning operation of the draft lever (29), and is also connected to the traction load detecting means. Being working machine (5)
A draft cam lever (53) that swings when a traction load is applied is provided, and the work machine (5) is provided with a traction load exceeding a set value.
When the draft cam lever (53) swings when
Draft link by pushing the contact member (50)
(44) is swung, and the draft link (44) is
The draft arm (41) is swung by swinging and pressed.
The interlock arm (37) is pushed by the member (42),
A work machine control device for a tractor, characterized in that the work machine (5) is lifted by the following .