JP2000046006A - Lever type signal generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the complication of the manufacturing work and the maintenance work, and to improve the reliability by providing a potentiometer in a peripheral part of any one of a pair of working rods of a device main body, and generating the electric signal corresponding to the displaced amount of the working rod from the potentiometer. SOLUTION: A lever type signal generating device is provided with an operating lever 60 arranged in a device main body 1 freely to be tilted, a pair of working rods 100 arranged in the device main body 1 freely to be moved along the axial direction and to be displaced from each other in response to the tilting of the operating lever 60, and a hydraulic signal generating means to be driven by the pair of working rods 120 and for generating the hydraulic signal corresponding to the displaced amount of the working rods 120. A potentiometer 140 is provided in a peripheral part of any one of the pair of the working rods 100 of the device main body 1, and the potentiometer 10 generates the electric signal corresponding to the displaced variable of the working rods 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever type signal generator for generating a signal corresponding to the amount of tilt of an operating lever by tilting the operating lever. More specifically, the present invention relates to an improvement of a lever-type signal generating device that generates a hydraulic signal and an electric signal simultaneously according to the amount of tilt of a single operation lever when a single operation lever is tilted.

[0002]

2. Description of the Related Art There has been provided a lever type signal generating device which simultaneously generates a hydraulic signal and an electric signal by a tilting operation of a single operating lever, and controls individual control objects by these control signals. .

[0003] An example of this kind of prior art is disclosed in Japanese Patent Publication No. Hei 7-116729.

In this prior art, a brush is provided via an insulator on an operating rod which reciprocates according to the amount of tilt of an operation lever and derives a pilot oil pressure, and a resistance element is provided on a main body of the apparatus. By changing the contact position between the brush and the resistance element by moving the operating rod, an electric signal is generated together with a hydraulic signal in accordance with the amount of tilt of the operating lever.

According to this prior art, for example, the operation of a switching valve for a main working machine of a construction machine is controlled based on a hydraulic signal, and a valve for adjusting the discharge amount of a main pump is controlled based on an electric signal. Accordingly, complicated control such as operating the main work machine while changing the discharge amount from the main pump can be performed by a single tilt operation of the operation lever. Therefore, operability can be significantly improved.

[0006]

In the prior art described above, in order to generate an electric signal together with a hydraulic signal,
It is necessary to separately provide a step of providing a brush on the operating rod and a step of providing a resistance element on the apparatus main body. Therefore, the manufacturing operation is complicated.

Further, in the above-mentioned prior art, the brush and the resistance element are arranged on the operating rod and the apparatus main body which move relative to each other, and further, the brush and the resistance element are always securely connected during the relative movement. It must be in sliding contact. Therefore, if a dimensional error or an assembly error occurs, the output electric signal is directly affected. Therefore, there is a problem in reliability.

Further, when adjusting the output voltage of an electric signal in a shipping inspection or when performing maintenance and inspection work, it is necessary to remove the operating rod from the apparatus main body. Therefore, it is extremely disadvantageous in terms of workability.

In the prior art, when the rate of change of the output electric signal with respect to the amount of tilt of the operation lever or the reference output voltage of the electric signal is to be changed, the operation rod is removed from the apparatus body with the operation rod removed. It is necessary to change the arrangement position of the brush or the arrangement position of the resistive element with respect to the apparatus main body. In addition, it is necessary to incorporate an operating rod into the apparatus body and perform a test each time the arrangement position of the brush or the resistance element is changed. Therefore, extremely complicated work is required.

An object of the present invention is to provide a lever-type signal generator capable of outputting an electric signal together with a hydraulic signal without compromising the manufacturing operation and the maintenance / inspection operation, and without impairing reliability. And

[0011]

Means for Solving the Problems and Functions and Effects
In the invention described in (1), the operation lever (60) is disposed on the apparatus main body (1) so as to be tiltable, and is disposed on the apparatus main body (1) so as to be movable in the axial direction, and the operation lever ( 6
0), a pair of operating rods (1
00), and a hydraulic signal generating means driven by the pair of operating rods (120) to generate a hydraulic signal corresponding to the displacement of the operating rod (120). A potentiometer (140) is provided on one of the outer peripheral portions of the pair of operating rods (100) in the main body (1), and an electric signal corresponding to the displacement of the operating rod (110) is generated from the potentiometer (140). I am trying to do it.

According to the first aspect of the present invention, the electric signal is output together with the hydraulic signal by providing the potentiometer in the apparatus main body.

Therefore, the manufacturing operation does not become complicated. Further, since the potentiometer is unitized, there is no possibility that the reliability of the output electric signal is reduced.

In addition, during the maintenance and inspection of the potentiometer, there is no need to perform an operation such as removing the operating rod from the apparatus main body, which is advantageous in terms of workability.

Further, since one potentiometer is provided for a pair of operating rods which are displaced relative to each other, it is possible to reduce the size of the apparatus and the number of parts.

According to the second aspect of the present invention, the potentiometer (140) according to the first aspect has a rotary shaft (1).
42), and an arm (1) provided on the rotation shaft (142).
43) which is engaged with the operating rod (110) via the arm (143) and provided with rotation angle changing means for changing the rotation angle of the arm (143) with respect to the displacement of the operating rod (110). ing.

According to the second aspect of the present invention, the rotation angle of the arm with respect to the displacement amount of the operating rod can be easily changed. Therefore, it is possible to easily adjust the ratio of the displacement amount of the output electric signal to the tilt amount of the operation lever.

According to a third aspect of the present invention, as the potentiometer (140) according to the first or second aspect, the potentiometer (140) includes a rotary shaft (14).
2) and an arm (14) provided on the rotation shaft (142).
3) the actuator rod (110) is engaged via the actuator rod (110), and is movably disposed on the apparatus main body (1) along the axial direction of the operation rod (110). I have.

According to the third aspect of the present invention, the reference output voltage of the electric signal output with respect to the tilt amount of the operation lever can be easily adjusted by appropriately moving the potentiometer with respect to the apparatus main body. It becomes possible.

According to a fourth aspect of the present invention, as the hydraulic signal generating means and the potentiometer according to the first, second, or third aspect, the control valves (RV, UV, V1, V1, V2) that output a control signal to each of them.

According to the fourth aspect of the invention, for example, the operation of the main directional control valve for the main working machine is controlled based on the hydraulic signal, and the discharge pressure of the main pump is adjusted based on the electric signal. By controlling the control valve,
Complex control, such as operating the main work machine while changing the discharge amount from the main pump, can be performed by tilting the single operation lever. Therefore, operability can be significantly improved.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing one embodiment. FIG. 1 is a sectional view showing one embodiment of a lever type signal generator according to the present invention. FIG. 2 shows a state in which the operation lever is tilted in one direction in the lever type signal generator shown in FIG. FIG. 3 shows a state in which the operation lever is tilted in the other direction in the lever type signal generator shown in FIG. FIG. 4 shows the bottom surface of the lever type signal generator shown in FIG.

The lever type signal generator exemplified here is:
As shown in the control circuit diagram of FIG.
1 and C2. When applied to a hydraulic excavator, for example, the hydraulic cylinder C1 becomes a boom cylinder and the hydraulic cylinder C2 becomes an arm cylinder. The lever type signal generator is provided in the driver's seat of a hydraulic shovel.

As shown in FIGS. 1 to 4, in this lever type signal generator, an upper body block 10 and a mounting plate 20 mounted on the upper surface of the upper body block 10 are provided.
The apparatus body 1 includes a lower body block 40 attached to the lower surface of the upper body block 10 via the intermediate plate 30, and a lower plate 50 attached to the lower surface of the lower body block 40.

The mounting plate 20 is provided with a tilting piece 23 via a first support shaft 22 on a forked bracket 21 provided at the center of the upper end. Further, this tilting piece member 2
3, an operation lever 60 is provided via the second support shaft 24.

The second support shaft 24 is parallel to the upper surface of the mounting plate 20 and perpendicular to the paper. This second
The support shaft 24 supports the operation lever 60 so as to be rotatable around the axis with respect to the tilting piece member 23. That is, the operation lever 60 can tilt in the left-right direction in FIG. 1 by rotating around the axis of the second support shaft 24.

The first support shaft 22 is parallel to the upper surface of the mounting plate 20 and perpendicular to the second support shaft 24. The first support shaft 22 supports the tilting piece member 23 with respect to the fork-shaped bracket 21 so as to be rotatable around its axis. That is, the operation lever 60 can be tilted in a direction orthogonal to the paper surface in FIG. 1 by rotating around the axis of the first support shaft 22 together with the tilting piece member 23.

Therefore, the operating lever 60 can be tilted in two directions perpendicular to each other with respect to the apparatus main body 1.

The operating lever 60 has an operating shaft member 61 for holding the above-described second support shaft 24 at the base end. A cam disk plate 62 and a nut member 63 for attaching a knob are mounted on the screw portion of the operation shaft member 61. The cam disc plate 62 has an operation shaft member 61.
Along the direction perpendicular to the axis of

A knob N (see FIG. 8) for an operator to perform a grip operation is attached to the knob attachment nut member 63 of the operation lever 60.

In the apparatus body 1, two pairs of insertion holes 11, 25,
31, 41, 51 penetrate.

The insertion hole 25 of the mounting plate 20, the insertion hole 11 of the upper body block 10, and the intermediate plate 30
And the insertion hole 51 of the lower plate 50 are circular holes.

The insertion hole 41 of the lower main body block 40 is provided with an oil seal mounting portion 41a, a spring accommodating portion 41b, and a connecting portion 4a.
1c and a spool receiving portion 41d.

The insertion hole 25 of the mounting plate 20 has a smaller diameter than the insertion hole 11 of the upper main body block 10. The insertion hole 31 of the intermediate plate 30 has a smaller diameter than the insertion hole 11 of the upper main body block 10.

The oil seal mounting portion 41a has a larger diameter than the insertion hole 11 of the upper main body block 10. Spring storage part 4
1b is the same inner diameter as the insertion hole 11 of the upper main body block 10. The connecting portion 41c has a smaller diameter than the spring accommodating portion 41b. The spool receiving portion 41d has the same inner diameter as the communication portion 41c.

The insertion hole 51 of the lower plate 50 has a larger diameter than the spool receiving portion 41d.

The two pairs of insertion holes 11, 25, 31, 4
Reference numerals 1 and 51 are arranged at equal intervals on an arc centered on the intersection of the first support shaft 22 and the second support shaft 24. The insertion holes 11, 25, 31, 41, and 51 are located on the extension of the axis of the support shafts 22 and 24, and are paired with each other.

As clearly shown in FIG.
No. 0 insertion holes 41 are provided with oil seal mounting portions 41a, respectively.
Is provided with a support ring 71. Lower plate 5
The plugs 81 of the pilot pipeline 80 are connected to the 0 insertion holes 51 respectively.

The support ring 71 has an inner diameter smaller than that of the spring accommodating portion 41b, and holds an oil seal 70 on the inner peripheral surface.

As shown in FIG. 8, the pilot line 80 is provided with directional control valves V1, V2 provided in the hydraulic cylinders C1, C2.
This is for supplying a pilot pressure to V2.

The pilot conduit 80 is paired with each pair of the insertion holes 11, 25, 31, 41, 51. A pair of pilot conduits 80 located on an extension of the axis of the first support shaft 22 are each provided with one directional control valve V1.
Connected to the pilot hole. A pair of pilot conduits 80 located on an extension of the axis of the second support shaft 24 are connected to pilot holes of the other directional control valve V2.

In the apparatus main body 1, operating rods 100 are respectively disposed at portions from the insertion hole 11 of the upper main body block 10 to the accommodating portion 41 b of the lower main body block 40. Further, the lower plate 50 is
The spools 130 are respectively disposed at the portions reaching the insertion holes 51 of the first and second portions.

As shown in FIGS. 1 and 7, the operating rod 100 has a distal shaft member 110 and a proximal shaft member 120, each of which is separately molded. The distal shaft member 110 and the proximal shaft member 120 are assembled to each other.

The tip shaft member 110 includes a contact rod 110
a and the engaging rod portion 110b are integrally formed. The diameter of the contact rod portion 110 a is slightly smaller than that of the insertion hole 25 of the mounting plate 20. Contact rod part 110
The tip of a is formed in a spherical shape. The engaging rod portion has the same columnar shape as the insertion hole 11 of the upper main body block. The engagement rod portion 110b has an annular engagement groove 110C formed on the outer peripheral surface of the intermediate portion.

In the distal shaft member 110, a center hole 110d is opened at a base end surface 110e of the engagement rod portion 110b.

As is apparent from FIG. 1, the tip shaft member 110 has an engagement rod portion 110b having an upper main body block 1.
The total length is shorter than the zero insertion hole 11. The tip shaft member 110 can move in the axial direction in the insertion hole 11 of the upper main body block 10.

The base shaft member 120 is provided on the guide rod portion 12.
0a, the first piston cap portion 120b, and the second piston cap portion 120c are integrally formed. The guide rod portion 120a is provided in the center hole 11 of the tip shaft member 110.
The diameter is slightly smaller than 0d. 1st piston cap part 1
20b is a columnar shape pressed against the oil seal 70.
The second piston cap portion 120c is located on the lower body block 4.
It has the same cylindrical shape as the 0 spring housing portion 41b.

The base shaft member 120 has a spring receiving hole 120e in the base end surface of the second piston cap portion 120c.
Is open. Further, a spool movable hole 120f is opened in the inner upper wall 120g of the spring accommodating hole 120e.

As is clear from FIG. 1, the length of the second piston cap portion 120c in the axial direction is shorter than that of the spring accommodating portion 41b of the lower main body block 40. The second piston cap portion 120c can be moved in the axial direction in the spring housing portion 41b of the lower main body block 40.

The entire length of the first piston cap portion 120b is longer than that of the oil seal mounting portion 41a of the lower body block 40. When the distal end surface of the second piston cap portion 120c is brought into contact with the proximal end surface of the support ring 71,
The first piston cap portion 120b projects into the insertion hole 11 of the upper body block 10.

The spool 130 is formed by integrally molding a land 130a, a continuous shaft 130b, a holding shaft 130c, and a head shaft 130d. The land portion 130a has substantially the same outer diameter as the spool receiving portion 41d of the lower main body block 40. The continuous shaft portion 130b has a smaller diameter than the land portion 130a. The holding shaft portion 130c has a smaller diameter than the continuous shaft portion 130b. The head shaft portion 130d has the same outer diameter as the continuous shaft portion 130b. The spool 130 is movably disposed on a spool receiving portion 41d via a land portion 130a.

As is apparent from FIG.
30 has a circumferential groove 130e on the outer peripheral surface of the land portion 130a.
Is formed. In addition, a communication hole 130f is formed inside a portion extending from the base end surface to the circumferential groove 130e.

The guide rod portion 120a is a follower spring 121
Through the center hole 110d of the tip shaft member 110.

The follower spring 121 has a sufficient length than the center hole 110d of the tip shaft member 110. The follower spring 121 moves the distal shaft member 11 with respect to the proximal shaft member 120.
0 is constantly pressed toward the tip.

The spool 130 movably holds the spring seat 131 on the holding shaft 130c. The spring seat 131 is fitted in the spring housing hole 120e. Spring receiving part 41
feeling spring 1 between the bottom wall of b and the spring seat 131
32 are interposed.

The feeling spring 132 has a sufficient length than the spring accommodating portion 41b. The feeling spring 132 has a sufficiently large spring force than the above-described follow-up spring 121. The feeling spring 132 presses the spring seat 131 against the inner upper wall of the second piston cap portion 120c. Further, the second piston cap portion 120c of the base shaft member 120 is always supported by the support ring 71 via the spring seat 131.
Is pressed against the base end surface.

The spool 130 has a land 130
a pressure setting spring 1 between the end face of
33 is interposed.

The pressure setting spring 133 has a sufficiently smaller spring force than the feeling spring 132. The pressure setting spring 133 always presses the spool 130 against the spring seat 131 toward the base end.

In the circumferential groove 130e, the spring seat 131 is pressed against the inner upper wall of the second piston cap portion 120c. In a state where the second piston cap portion 120c of the proximal shaft member 120 is in contact with the proximal surface of the support ring 71, the second piston cap portion 120c is located at a meeting portion between the spring accommodating portion 41b of the lower main body block 40 and the communication portion 41c. Further, the spring accommodating portion 41b and the communication portion 41c communicate with each other. At this time, the spring accommodating portion 41b and the insertion hole 51 of the lower plate 50 communicate with each other through the communication hole 130f.

On the other hand, in the lever type signal generator, a pump pressure passage 42 and a drain passage 43 are formed inside the lower body block 40 as shown in FIGS. The upper body block 10 has a pair of operating rods 10.
One potentiometer 140 is provided for each of the zeros.

The base end of the pump pressure passage 42 is opened to the side surface of the lower main body block 40 and connected to a pilot pump 45 via a pilot hydraulic line 44.

The front end of the pilot passage 44 branches into four inside the lower main body block 40, and each of them is open to the peripheral surface of the spool receiving portion 41d.

The base end of the drain passage 43 is opened to the side surface of the lower main body block 40 and connected to a hydraulic oil tank 47 through a drain pipe 46.

The distal end of the drain passage 43 branches into four inside the lower main body block 40, each of which is open to the peripheral surface of the spring accommodating portion 41b.

FIG. 5 is a view as seen from the arrow V in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG.

As shown in FIGS. 1 and 4 to 6, each of the potentiometers 140 includes a rotary shaft 142 provided at the center of a main body 141 and a drive arm 143 disposed on the rotary shaft 142. This potentiometer 14
8 is a control signal corresponding to the swing position of the drive arm 143 with respect to the main body 141.
Reference).

As is apparent from FIG. 1, each of the potentiometers 140 has its main body 141 held by an individual adjustment bracket 144.

The adjustment bracket 144 has a long hole 144a in each flange. A shim plate (rotation angle changing means) 147 is interposed between the adjustment bracket 144 and the flange. In addition, a long hole 144a
The screws 146 are fastened to the common unit plate 145 via the
0 is held so that the position can be adjusted.

The potentiometers 140 are attached to the upper main body block 10 such that the unit plate 145 faces the insertion holes 11 adjacent to each other in the upper main body block 10. Further, through the engagement opening 145a formed in the unit plate 145, the distal end of the drive arm 143 is connected to the corresponding operating rod 1
00 in the engagement groove 110c. Reference numeral 148 in the figure is a unit cover that covers each potentiometer 140.

Hereinafter, the operation of the above-mentioned lever type signal generator will be described.

FIG. 1 shows a state where the operation lever 60 is in a neutral position. In this neutral state, the second piston cap portion 120 of each operating rod 100 is
c is pressed against the base end surface of the support ring 71. Further, the tip shaft member 110 of each operating rod 100 is pressed against the cam disk plate 62 via the contact rod portion 110a by the follower spring 121. The axis of the operation shaft portion 61 extends in the vertical direction by the action of each of the feeling spring 132 and the following spring 121.

In this state, each operating rod 100
The circumferential groove 130e of the spool 130 provided in the lower main body block 40 is located at the meeting portion between the spring accommodating portion 41b and the communication portion 41c. Therefore, the spring receiving portion 41b and the insertion hole 51 of the lower plate 50 communicate with each other.

As a result, all pilot lines 80,
80 'is the drain pressure. Hydraulic cylinder C1, C
2, the directional control valves V1 and V2 are kept neutral, and the hydraulic cylinders C1 and C2 do not operate.

Next, the operation when the operating lever 60 is tilted around the axis of the second support shaft 24 from the above-described state will be described.

As shown in FIG. 2, the operation lever 60 is
When tilted to the right around the axis of the support shaft 24, the right operating rod 10
0 moves down.

At this time, the operating force for moving the operating rod 100 downward is against the pressing force of the feeling spring 132 disposed on the right operating rod 100. The amount of downward movement of the operating rod 100 depends on the amount of tilt of the operation lever 60.

When the right operating rod 100 moves downward, the right spool 130 moves downward according to the amount of tilt of the operation lever 60 by the pressing force of the pressure setting spring 133. Circumferential groove 1
30e is located in the pump pressure passage 42, so that the pump pressure passage 42 and the lower plate 5 are connected through the communication hole 130f.
0 and the insertion hole 51 are communicated with each other.

As a result, the pilot pressure is supplied to one pilot hole of the directional control valve V1 through the pilot line 80. The other pilot hole of the direction control valve V1 has a drain pressure as described later. Therefore, the direction control valve V1 is moved leftward, and the hydraulic cylinder C1 is extended.

The pilot pressure supplied through the pilot line 80 includes a force for moving the spool 130 upward by the hydraulic pressure of the pilot line 80 and a pressure setting spring 1.
33 is determined by the balance with the pressing force. That is, the pilot pressure corresponds to the amount of tilt of the operation lever 60.

In the meantime, in the operating rod 100 on the left side, the proximal shaft member 120 is connected to the second piston cap portion 120c and the first piston cap portion 120c.
The position in contact with the base end surface of the support ring 71 is maintained through the step 120h between the piston cap 120b.

Accordingly, the other pilot hole of the direction control valve V1 has a drain pressure as in the neutral state described above.

The distal shaft member 110 is connected to the proximal shaft member 120.
Are moved upward by the pressing force of the follower spring 121 interposed between the cam disc plate 62 and the front end thereof is always in contact with the cam disk plate 62.

Next, from the state shown in FIG.
The operation in the case where the operation force that has been tilting is removed will be described.

When the operating force of the operating lever 60 is removed, the pressing force of the feeling spring 132 causes the
0 moves upward. Further, the cam disk plate 62 is pressed upward via the tip shaft member 110. Therefore, it returns to the neutral state shown in FIG. 1 again.

As a result, the pilot pressure of the direction control valve V1 becomes the drain pressure. Therefore, the directional control valve V1
Is returned to the neutral position, the hydraulic cylinder C
Stops when 1 is expanded.

Next, the operation when the operating lever 60 is tilted leftward around the axis of the second support shaft 24 will be described.

When the operating lever 60 is tilted to the left, the left operating rod 100 moves downward via the cam disk plate 62 as shown in FIG. When the operating rod 100 moves down, the left spool 130 moves down by the pressing force of the pressure setting spring 133. Therefore, the circumferential groove 130e
The pump pressure passage 42 and the insertion hole 51 of the lower plate 50 communicate with each other through the communication hole 130f.

As a result, pilot pressure is supplied to the other pilot hole of the directional control valve V1 through the pilot line 80 '. One pilot hole of the directional control valve V1 has a drain pressure, and the directional control valve V1 moves to the right so that the corresponding hydraulic cylinder C1 starts to retract.

During these operations, the potentiometer 140 is operated in accordance with the amount of displacement of the tip shaft member 110 on the operating rod 100. Activated potentiometer 14
From 0, an electric signal corresponding to the amount of tilt of the operation lever 60 is output. This electric signal is output to the valve controller VC. That is, when the operation lever 60 is tilted rightward about the axis of the second support shaft 24, the drive arm 143 rotates counterclockwise due to the downward movement of the tip shaft member 110. When the operation lever 60 is tilted leftward around the axis of the second support shaft 24, the drive arm 143 rotates clockwise due to the upward movement of the tip shaft member 110. Therefore, a control signal corresponding to the swing position of the drive arm 143 with respect to the main body 141 is output to the valve control unit VC.

The valve controller VC to which the electric signal is given
Controls the unload valve UV for controlling the supply pressure from the main pump 150 and the relief valve RV for setting the maximum supply pressure from the main pump 150 individually based on the output signal from the potentiometer 140. The operating characteristics of the hydraulic circuit are changed by changing the set pressures of the valves UV and RV.

As a result, the set pressure of the unload valve UV and the relief valve RV can be changed by the valve controller VC in accordance with the amount of tilt of the operation lever 60.

Therefore, for example, if the set pressure of the unload valve UV is changed in proportion to the amount of tilt of the operation lever 60, energy loss when the amount of tilt of the operation lever 60 is small can be reduced. . Operability when the tilt amount of the operation lever 60 is large can be improved. Further, the operating characteristics can be changed in the same hydraulic circuit.

In this case, even if a failure occurs in the electric signal system, the basic operation of operating the hydraulic cylinder C1 is not affected at all. Therefore, there is no possibility that reliability is impaired even when applied to a hydraulic excavator.

Further, according to the lever type signal generator, the unitized potentiometer 140 is provided in the apparatus main body 1. Therefore, the production work and the maintenance and inspection work are not complicated. Also, the reliability of the electric signal output from the potentiometer 140 is improved.

Further, a pair of operating rods 10 which are displaced relative to each other
Since only one potentiometer 140 needs to be provided for 0, it is possible to reduce the size of the device and the number of components.

By the way, as shown by the broken line in FIG. 9, the rate of change of the electric signal output from the potentiometer 140 with respect to the amount of tilt of the operation lever 60 is changed, or as shown by the two-dot chain line in FIG. In some cases, the reference output voltage of the electric signal output from the potentiometer 140 should be changed with respect to the amount of tilt of the operation lever 60.

In this case, first, the thickness of the shim plate 147 interposed between the unit plate 145 and the adjustment bracket 144 is changed to change the thickness of the potentiometer 14.
The distance between the axis of the rotating shaft 142 at 0 and the axis of the operating rod 100 is changed. Further, the driving arm 143
To a different length.

As a result, it is possible to easily change the rotation angle of the drive arm 143 with respect to the displacement amount of the tip shaft member 110 in the operation rod 100. Therefore, it is possible to easily adjust the ratio of the amount of displacement of the output electric signal to the amount of tilt of the operation lever 60. If a drive arm 143 that can expand and contract is applied as the drive arm 143 of the potentiometer 140, when the ratio of the displacement of the electric signal to the tilt of the operation lever 60 is changed, the drive arm
The replacement of 43 is unnecessary. Therefore, the work can be further facilitated.

On the other hand, the swing position of the drive arm 143 with respect to the main body 141 can be changed by changing the fastening position of the screw 146 with respect to the elongated hole 144a provided in the adjustment bracket 144. Therefore, it is possible to change the reference output voltage of the electric signal with respect to the tilt amount of the operation lever 60.

The operation of the lever type signal generator is described only for the case where the operation lever 60 is tilted around the axis of the second support shaft 24. However, the above-described operation and effects are obtained by operating the operation lever 60 in any direction. It is needless to say that the same applies to the case of tilting to.

In the above embodiment, the operation lever 60 is tilted around the axis of the first support shaft 22 and the second support shaft 24. However, the present invention can of course be applied to one in which the operating lever 60 is tilted around only one support shaft.

In the above-described embodiment, a lever type signal generator for outputting a control signal to various control valves provided in a hydraulic circuit of a hydraulic shovel is exemplified. Of course, it can be applied. In this case, it is not always necessary to change the operating characteristics of the hydraulic circuit in accordance with the amount of tilt of the operation lever 60.
When the above actuators are simultaneously controlled, it is also possible to control the operating characteristics of the hydraulic circuit by the operation amount of each actuator operation lever and the combination of the simultaneously controlled actuators.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a lever-type signal generator according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which an operation lever is tilted in one direction in the lever type signal generator shown in FIG.

FIG. 3 is a cross-sectional view showing a state where the operation lever is tilted in the other direction in the lever-type signal generator shown in FIG.

FIG. 4 is a bottom view of the lever type signal generator shown in FIG. 1;

FIG. 5 is a diagram viewed from an arrow in FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI in FIG.

7A and 7B show an operating rod and a spool member applied to the lever type signal generator shown in FIG.
Is an exploded sectional view, and (b) is an assembled sectional view.

FIG. 8 is a control circuit diagram of a hydraulic cylinder to which the lever type signal generator shown in FIG. 1 is applied.

9 is a graph showing the relationship between the amount of tilt of an operation lever and the output voltage of an electric signal output from a potentiometer in the lever type signal generator shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Device main body, 41c ... Communication part, 41d ... Spool receiving part, 42 ... Pump pressure passage, 43 ... Drain passage, 44 ... Pilot hydraulic line, 45 ... Pilot pump, 60 ... Operating lever, 80 ... Pilot line, 100: operating rod, 110: distal shaft member, 120: proximal shaft member, 130
... Spool, 130a ... Land part, 130e ... Circumferential groove,
130f: communication hole, 140: potentiometer, 142
... Rotating shaft, 143 ... Drive arm, 147 ... Shim plate, RV ... Relief valve, UV ... Unload valve,
V1, V2 ... directional control valves.

[Procedure amendment]

[Submission date] August 5, 1998 (1998.8.5)

[Procedure amendment 1]

[Document name to be amended] Drawing

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[Document name to be amended] Drawing

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[Procedure amendment 5]

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 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H002 BA01 BA02 BB01 BB06 BD04 BE01 BE04 3J070 AA03 BA51 CA26 CA47 CC12 CC71 EA11

Claims (4)

[Claims] An operation lever (60) arranged to be tiltable on an apparatus main body (1); and an operation lever (60) arranged on the apparatus main body (1) so as to be movable along an axial direction. ), A pair of operating rods (100) that are correlated and displaced in accordance with the tilting, and a hydraulic signal generation driven by the pair of operating rods (120) to generate a hydraulic signal corresponding to the amount of displacement of the operating rod (120). And a lever-type signal generating device comprising:
00) on one of the outer peripheral portions.
40) The lever type signal generating device characterized in that an electric signal corresponding to the displacement amount of the operating rod (110) is generated from the potentiometer (140). 2. The potentiometer (140) has a rotating shaft (142) and engages with the operating rod (110) through an arm (143) provided on the rotating shaft (142). 2. A lever type signal generator according to claim 1, further comprising a rotation angle changing means for changing a rotation angle of said arm (143) with respect to a displacement amount of said operating rod (110). 3. The potentiometer (140) has a rotating shaft (142) and engages with the operating rod (110) via an arm (143) provided on the rotating shaft (142). The lever-type signal generator according to claim 1 or 2, wherein the lever-type signal generator is movably disposed on the apparatus main body (1) so as to be along the axial direction of the operating rod (110). 4. The hydraulic signal generating means and the potentiometer (140) output control signals to control valves (RV, UV, V1, V2) provided in a common hydraulic circuit. The lever-type signal generator according to claim 1, 2 or 3, wherein: