JP3197722B2 - Motor grader blade turning operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for turning a blade of a motor grader.

[0002]

2. Description of the Related Art For example, a motor grader shown in FIG. 1 is known. That is, the drawbar 2 is swingably supported at the front end of the vehicle body 1, and the left and right lifting cylinders 3 and 4 and the lateral feed cylinder 5 are connected between the drawbar 2 and the vehicle body 1. Is pivotably provided by a pivoting hydraulic motor 7, a blade 9 is provided on a bracket 8 of the pivoting circle 6 so as to be movable left and right by a shift cylinder 10, and the front wheel 11 can be tilted left and right (leaning) by a leaning cylinder (not shown). It is like that.

In order to drive the cylinders and the swing hydraulic motor 7 to move the blade 9 up and down, swing, etc., directional control valves for supplying pressure oil to the cylinders and the swing hydraulic motor 7 are provided. The valve is switched by an operating lever.

[0004]

In order to change the angle between the front and rear direction of the vehicle body 1 and the blade 9 by turning the blade 9 in the above-mentioned motor grader, that is, the propulsion angle, the operation lever is operated to control the turning direction. The valve is switched to supply hydraulic oil to the turning hydraulic motor 7 to turn the blade 9 together with the turning circle 6. However, since the left and right ends of the blade 9 move in an arc, the left and right ends of the blade 9 move. The left and right ends of the blade 9 collide with an obstacle such as a curb when the position is different before and after the turn, that is, when the propulsion angle of the blade is changed. There is.

In order to prevent this, the blade 9 is moved to the left and right with respect to the swivel circle 6 by operating another operation lever to switch the direction control valve for blade shift and extend / contract the shift cylinder 10. It is only necessary to operate the two operation levers minutely, but this is very troublesome.

It is an object of the present invention to provide a motor grader blade turning operation device capable of solving the above-mentioned problems.

[0007]

A draw bar 2 is supported on a vehicle body 1 by left and right elevating cylinders 3 and 4 so as to be vertically swingable, and a transverse feed cylinder 5 is connected to the draw bar 2 and the vehicle body 1.
In a motor grader in which the turning circle 6 is rotatably mounted by a turning hydraulic motor 7 and a blade 9 is provided on the turning circle 6 so as to be movable left and right by a shift cylinder 10, an operation member for outputting a blade turning signal, A first valve for supplying pressure oil to the motor 7, a second valve for supplying pressure oil to the shift cylinder 10, means for detecting a turning angle of the blade 9, and an amount of lateral movement of the blade 9 Means for calculating, and switching to the first and second valves to simultaneously rotate the blade 9 based on a blade rotation signal, a blade rotation angle, and a blade movement amount of the operation member, and to move left and right by a stroke corresponding to the rotation angle. A blade turning operation device of a motor grader provided with a controller 26 having a function of outputting a signal.

[0008]

[Operation] By operating the operating member and outputting a blade turning signal, the turning hydraulic motor 7 and the shift cylinder 10 operate to turn the blade 9 and, at the same time, move the blade 9 to the circle 6 by an amount corresponding to the turning angle. To move the blade 9 from one side to the other.
Can be turned left and right at a constant left and right end, and when the propulsion angle of the blade 9 is changed, the blade 9 does not move left and right and collides with a curb or the like, and the turning operation of the blade 9 is simplified.

[0009]

As shown in FIG. 2, operation members, for example, a first operation lever 22 and a second operation lever 23 are provided on the left and right sides of a seat 21 of a cab 20 of the motor grader shown in FIG. A handle 24 is provided in front of the seat 21. The left and right operation levers 22 and 23 may be mounted on both left and right sides of the support member 25 of the handle 24. The first,
The second operation levers 22 and 23 can be tilted in the front-rear direction, the left-right direction, and the oblique front-rear left-right direction, and output an electric signal proportional to the operation stroke. That is, the first
When the second operation levers 22 and 23 are operated, the potentiometer is rotated to output an electric signal corresponding to the operation direction and proportional to the operation stroke.

The output signals of the first and second operation levers 22 and 23 are input to a controller 26 as shown in FIG. 3, and an ON / OFF signal is input from a changeover switch 27 to the controller 26. Sensor 28
The rotation angle signal is input from the rotation sensor 29, and the controller 26 is configured to supply a hydraulic oil to each cylinder and the rotation hydraulic motor based on the input signal. An electric signal is output to the solenoid of the solenoid valve 30 and the display panel 3
A signal is sent to 1 to display the operation status and the like.

FIG. 4 is a hydraulic circuit diagram. The proportional solenoid valve 30 includes a first proportional solenoid valve 30-1 for supplying pressure oil to the left lifting cylinder 3 and a second proportional solenoid valve for supplying pressure oil to the right lifting cylinder 4. Solenoid valve 30-2, third proportional solenoid valve 30-3 for supplying pressure oil to lateral feed cylinder 5, third proportional solenoid valve 30-4 for supplying pressure oil to shift cylinder 10, and pressure oil for steering cylinder 32 Fifth proportional solenoid valve 30-5 to supply, sixth proportional solenoid valve 3 to supply pressure oil to leaning cylinder 33
0-6, a seventh proportional electromagnetic valve 30-7 for supplying pressure oil to the cylinder 34 for the scalifier, and an eighth proportional electromagnetic valve 30-8 for supplying pressure oil to the swing hydraulic motor 7; By sending an energizing signal from the controller 26 to the proportional solenoid valves 30-1 to 30-8 to switch the proportional solenoid valves 30-1 to 30-8, the hydraulic pressure discharged from the hydraulic pump 35 is supplied to each cylinder and the turning hydraulic motor 7. In addition,
The first to eighth proportional solenoid valves 30-1 to 30-8 are switched by a stroke proportional to the amount of energization so that the opening area (supply area) is proportional to the amount of energization.

As shown in FIG. 5, the first operation lever 22 is operated in front, rear, left, right, front right, rear right, front left, and rear left directions. As shown in FIG. Output to The electric signal output from the first operation lever 22 is sent to the controller 26 to determine an operation pattern based on the ON / OFF signal of the changeover switch 27 and select a combination of output signals.

Next, the operation of turning the blade 9 will be described. (1) When turning left with the blade right end constant. When the first operation lever 22 is operated to the front right, the controller 2
The left turning signal is input to 6 and a left turning signal is output to the eighth proportional solenoid valve 30-8. The turning hydraulic motor 7 turns left as the left turning position a, and the blade 9 turns to the left together with the circle 6. At the same time, an extension signal is output from the controller 26 to the fourth proportional solenoid valve 30-4 to reach the extension position b, and the shift cylinder 10 extends to move the blade 9 rightward with respect to the circle 6 (FIG. 7 ( As shown in a), the right end 9a of the blade 9 turns left while being constant.

The rightward movement amount of the blade 9 is
(That is, the turning angle θ of the circle 6) and the length L from the turning center 6a of the blade 9 to the right end 9a, a sensor for detecting the turning angle θ of the circle 6, for example, the turning hydraulic motor 7 A rotation sensor 29 comprising a pulse encoder and a calculator for calculating a circle turning angle θ based on the output pulse is provided, and the rightward moving amount of the blade 9a is calculated based on the turning angle θ and the length L. A sensor 32 for detecting the amount, for example, a stroke sensor of the shift cylinder 10 or a linear potentiometer operated by the movement of the blade 9 is provided. When the actual movement amount of the blade 9 matches the calculated movement amount, the fourth proportional electromagnetic The extension signal to the valve 30-4 is stopped.

(2) When turning right with the blade right end constant. When the first operation lever 22 is operated rightward, the controller 2
6, a right turn signal is input to the eighth proportional solenoid valve 30-8, and a left turn signal is output. The right turn position c is set, the turning hydraulic motor 7 turns left, and the blade 9 turns right with the circle 6. I do. At the same time, an extension signal is output from the controller 26 to the fourth proportional solenoid valve 30-4 to reach the extension position b, and the shift cylinder 10 extends to move the blade 9 rightward with respect to the circle 6 (FIG. 7 ( As shown in b), the right end 9a of the blade 9 turns to the right while being constant. The rightward moving amount of the blade 9 at this time is the same as that described above.

(3) When turning right with the blade left end constant. When the first operation lever 22 is operated to the left front, the controller 2
6, a right turn signal is input to the eighth proportional solenoid valve 30-8, and a right turn signal is output to the eighth proportional solenoid valve 30-8 to set the left turn position c. I do. At the same time, a reduction signal is output from the controller 26 to the fourth proportional solenoid valve 30-4 to reach the reduction position d, and the shift cylinder 10 is reduced to move the blade 9 to the left with respect to the circle 6. As shown in c), the left end 9b of the blade 9 turns to the right while being constant. At this time, the rightward moving amount of the blade 9 is the same as described above.

(4) When turning left with the blade left end constant. When the first operation lever 22 is operated rightward, the controller 2
The left turning signal is input to 6 and a left turning signal is output to the eighth proportional solenoid valve 30-8. The turning hydraulic motor 7 turns left as the left turning position a, and the blade 9 turns to the left together with the circle 6. At the same time, the controller 26 outputs a contraction signal to the fourth proportional solenoid valve 30-4 to reach the extension position d, and the shift cylinder 10 contracts to move the blade 9 to the left with respect to the circle 6. As shown in d), the left end 9b of the blade 9 turns to the left while being constant. At this time, the rightward moving amount of the blade 9 is the same as that described above.

Next, another embodiment of the operating member will be described. FIG. 8 shows a second embodiment, in which the first operation member 50 and the second operation member 60 are of a push button type having a plurality of push button switches. That is, the first operating member 50 is a rectangular main body 51.
, A left front push button switch 52 near the left front corner 51a, a right front push button switch 53 near the right front corner 51b, a left rear push button switch 54 near the left rear corner 51c, and a right rear corner 51d.
A right rear push button switch 55 is provided on each side, and a front push button switch 56 is provided near the left and right intermediate front portion 51e of the main body 51.
A rear push button switch 57 is provided near the left and right middle rear portion 51f, a left push button switch 58 is provided near the front and rear middle left portion 51g, and a right push button switch 59 is provided near the front and rear middle right portion 51h.

Each of the push-button switches outputs an electric signal when pressed, and the level of the output electric signal sequentially increases in proportion to the time for which the button is kept pressed.
0 has the same function as the above-mentioned first operation lever 22.
Each of the push button switches may have an ON / OFF function.

Since each of the pushbutton switches has a triangular shape and is disposed between each corner and the adjacent pushbutton switch, each of the pushbutton switches can be efficiently disposed in the small main body 51, and the size is reduced. According to the position of each push button switch, the function of the push button switch, that is, the type of the operated actuator can be easily determined, and the operability of the operator can be improved.

The second operating member 60 has a rectangular main body 61.
The front push button switch 62 is located near the left and right middle front part 61a, the rear push button switch 63 is located near the left and right middle rear part 61b, the left push button switch 64 is located near the left and right middle part 61c, and the right push button switch 65 is located near the right and left middle part 61d. Each is provided.

Each of the push-button switches outputs an electric signal when pressed, and the level of the output electric power gradually increases in proportion to the time for which the button is kept pressed. The right operating member 60 is similar to the second operating lever 23 described above. It has various functions. Each push button switch may have an ON / OFF function.

FIG. 9 shows a third embodiment, in which a first operating member 5 is provided.
0 main body 51 is formed into a shape that is long and curved in the left-right direction, and a left push button switch 58 and a right push button switch 5
9. A rear push button switch 57, a front push button switch 56, a left rear push button switch 54, a left front push button switch 52, a right rear push button switch 55, and a right front push button switch 53 are sequentially arranged from the left.

The main body 61 of the second operation member 60 is formed to have a long and curved shape in the left-right direction, and a front push button switch 62, a rear push button switch 63, a right push button switch 65, and a left push button switch 64 are sequentially arranged on the main body 61 from the left. It is provided side by side.

With this arrangement, the first operation member 50 and the second operation member 51 can be arranged close to the left and right sides of the seat 21, so that the distance from the operator to each of the push button switches is shortened and operation becomes easy. .

FIG. 10 shows a fourth embodiment in which the main body 51 of the first operation member 50 is formed in a rectangular shape which is long in the left-right direction, and the main body 51 has a rear push button switch 57, a left push button switch 58, a right push button switch 59, and a left push button switch 59. A rear push button switch 54 and a right rear push button switch 55 are sequentially arranged from left to right, a front push button switch 56 is provided near a front portion between a rear push button switch 57 and a left push button switch 58, and a right push button switch 59 and a left rear push button are provided. A left front push button switch 52 is provided closer to the front between the switch 54 and a right front push button switch 53 is provided closer to the right front of the right rear push button switch 55. In this way, the piano feels like playing the piano with the left hand. A push button switch can be operated.

As shown in FIG. 10, the main body 61 of the second operating member 60 is formed in a rectangular shape which is long in the left-right direction.
A rear push button switch 63, a left push button switch 64, and a right push button switch 65 are sequentially arranged from the left.
The front push button switch 62 is provided near the front between the 3 and the left push button switch 64, so that the push button switch can be operated as if playing the piano with the right hand. When the blade is turned by these operation members, the right front push button switch 53 and the right rear push button switch 5 of the first operation member 50
5 can be input to the controller 26 by inputting a signal.

FIG. 11 shows a fifth embodiment in which the main body 51 of the first operation member 50 is formed in a rectangular shape elongated in the left-right direction, and the main body 51 has first, second, third, and fourth push buttons 70, 71, 7
The first, second, third, and fourth switches 70, 71, 72, and 73 are swingable around a middle point in the front-rear direction, and a front portion 7 of the first switch 70 is provided.
When 0a is pressed, a front left signal is output, and when a rear part 70b is pressed, a rear left signal is output. Similarly, a front part 71a of the second switch 71 is output.
Pressing outputs the front signal, pressing the rear part 71b outputs the rear signal,
When the front part 72a of the third switch 72 is pressed, a left signal is output,
Pressing 2b outputs a right signal, pressing the front part 73a of the fourth switch 73 outputs a right front signal, pressing the rear part 73b outputs a right rear signal, and outputs the first, second, third, and fourth switches 70, 7
1, 72 and 73 are seesaw switches.

The main body 61 of the second operation member 60 has first and second
Switches 74 and 75 are provided, and the first and second switches 7
4 and 75 are swingable around the middle between front and rear,
When the front part 74a of the switch 74 is pressed, a front signal is output. When the rear part 74b is pressed, a seesaw switch is output. When the front part 75a of the second switch 75 is pressed, a left signal is output.
A seesaw switch that outputs a right signal when the rear part 75b is pressed. In order to rotate the blade by this operating member, the front right portion 73a and the rear right portion 73b of the fourth switch 73 may be pressed to input a right front signal and a right rear signal to the controller 26.

Next, another embodiment of the directional control valve will be described.
In the above embodiment, the directional control valve is a proportional solenoid valve. However, as shown in FIG. 12, a pilot type switching valve 80 that performs switching operation by pilot pressure, and a pilot pressure receiving portion 81 of the pilot type switching valve 80, And a proportional electromagnetic pressure control valve 82 that supplies the solenoid valve, and a solenoid 83 of the proportional electromagnetic valve pressure control valve 82 supplies a controller 26
The energization may be further performed so that the opening degree of the pilot switching valve 80 becomes a value proportional to the energization amount.

[0031]

The turning hydraulic motor 7 and the shift cylinder 10 are output by operating the operating member to output a blade turning signal.
Actuates to rotate the blade 9 and at the same time, moves the blade 9 left and right with respect to the circle 6 by an amount corresponding to the rotation angle. When the propulsion angle of the blade 9 is changed, the blade 9 does not move left and right to collide with a curb or the like, and the turning operation of the blade 9 is simplified.

[Brief description of the drawings]

FIG. 1 is a side view of a motor grader.

FIG. 2 is a perspective view of a cab provided with the operating device of the present invention.

FIG. 3 is a perspective view of the operation device.

FIG. 4 is a hydraulic circuit diagram.

FIG. 5 is an explanatory diagram of an operation direction of a left operation lever.

FIG. 6 is a table showing a relationship between a stroke and an output signal.

FIG. 7 is an explanatory view of a turning operation of the blade.

FIG. 8 is an explanatory diagram of a second embodiment of the operation member.

FIG. 9 is an explanatory view of a third embodiment of the operation member.

FIG. 10 is an explanatory view of a fourth embodiment of the operation member.

FIG. 11 is an explanatory view of a fifth embodiment of the operating member.

FIG. 12 is an explanatory view showing another example of the direction control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Drawbar, 6 ... Circle, 7 ... Hydraulic motor, 9 ... Blade, 10 ... Shift cylinder, 22 ...
1st operation lever, 30-4 ... 4th proportional solenoid valve, 30-8
... Eighth proportional solenoid valve.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 3/85 E02F 3/76

Claims (6)

(57) [Claims] 1. A draw bar 2 is supported on a vehicle body 1 so as to be vertically swingable by left and right lifting cylinders 3 and 4, and a transverse feed cylinder 5 is connected to the draw bar 2 and the vehicle body 1. In a motor grader which is mounted so as to be able to turn by a motor 7 and is provided with a blade 9 on this turning circle 6 so as to be movable left and right by a shift cylinder 10, an operation member for outputting a blade turning signal and pressure oil is supplied to the turning hydraulic motor 7. A first valve for supplying pressure oil to the shift cylinder 10;
Means for detecting the turning angle of the blade 9; means for calculating the amount of left and right movement of the blade 9; and turning the blade 9 based on the blade turning signal, the blade turning angle and the blade moving amount of the operating member, and at the same time according to the turning angle. A motor grader blade turning operation device provided with a controller 26 having a function of outputting a switching signal to the first and second valves so as to move left and right by a predetermined stroke. 2. The blade turning operation device for a motor grader according to claim 1, wherein said operation member is an operation lever which can be operated in any direction of front / rear and left / right and outputs a proportional signal to the operation direction and operation stroke. 3. The switch according to claim 1, wherein said operating member is a switch.
A blade turning operation device for a motor grader according to claim 1. 4. The apparatus according to claim 1, wherein said valve is a proportional solenoid valve. 5. The blade turning operation device for a motor grader according to claim 1, wherein said valves are a pilot switching valve and a proportional electromagnetic pressure control valve. 6. A motor grader in which a turning circle 6 is attached to a draw bar 2 supported on a vehicle body 1 so as to be able to turn by a turning hydraulic motor 7, and a blade 9 is provided on the turning circle 6 so as to be movable left and right by a shift cylinder 10. An operating member that outputs a turning signal, a first proportional solenoid valve that supplies pressure oil to the turning hydraulic motor 7, a second proportional solenoid valve that supplies pressure oil to the shift cylinder 10, Means for detecting a turning angle, means for calculating the amount of lateral movement of the blade 9, and switching between the first and second proportional solenoid valves based on a signal from the operating member, the blade turning angle and the amount of blade movement. 2. The motor turning device according to claim 1, further comprising a controller for turning the rotary shaft at the same time as turning the rotary shaft.