JPS63307704A - Electric lever device - Google Patents

Abstract

PURPOSE:To make it possible to output an electric signal without intervention of gear engagement and also to apply the title lever device for driving of a plurality of members of a working machine by a method wherein said lever device is constituted in such a manner that the rotation of a lever is transmitted to a sensor in the form of the movement of a pusher. CONSTITUTION:A pusher 32 which moves in accordance with the rotation of a lever 20, a controlling member 34 which controls the movement of the pusher 32 in the direction of the lever and a spring 36, which energizes the pusher 32 in the direction of the lever 20, are provided. An output device 37 consists of a linear stroke type sensor 37 on which the pusher 32 can be engaged and a casing 26, in which the spring 36 and the opposing parts of the pusher 32 and the linear stroke type sensor 37 are housed, is provided and a vent hole 30 is formed on the casing 26. The rotation of the lever is transmitted to the linear stroke type sensor through the intermediary of the movement of the pusher, also the pusher is shifted to the position controlled by the control member by the force of the spring when the lever returns to the neutral point, an electric signal can be outputted without intervention of gear engagement, and the title lever device can be applied to the driving of a plurality of members of a working machine. Also, the pressure in the casing can be maintained uniform, and the lever device having excellent durability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric lever device that is installed in various working machines and has an output device that outputs an electric signal according to the amount of rotation of the lever.

<Prior Art> FIG. 10 is a side sectional view showing this type of conventional electric lever device, and FIG. 11 is a view taken in the direction of arrow A in FIG. 10. In this prior art, a shaft 2 having a large diameter portion and a small diameter portion is integrally provided at the lower end of a lever 1, and the shaft 2 is rotatably supported by a support 4 via a bearing 3. . And axis 2
A helical spring 5 is installed between one small diameter portion of the lever 1 and the support body 4, and the helical spring 5 urges the lever 1 to return to the neutral position. A fan-shaped member 6 is integrally provided on the other small diameter portion of the shaft 2, and this membrane member 6
A gear 7 is formed around the periphery. A gear 8 is arranged to mesh with this gear 7, and this gear 8 is connected to the lever 1.
The rotary potentiometer 9 is integrally attached to an operating shaft 10 of an output device, that is, a rotary potentiometer 9, which outputs an electric signal according to the amount of rotation of the rotary potentiometer.

In addition, (? the moving shaft 10 is rotatably supported by the support body 4,
The case of the potentiometer 9 is provided integrally with the support 4.

Then, the operator grasps lever 1 and, for example,
When the shaft 2 is rotated in the direction of arrow 11 in the figure, the shaft 2 rotates integrally against the force of the helical spring 5, and the fan-shaped member 6 integrally rotates around this shaft 2 portion. A gear 8 rotates through the lever 7, an operating shaft 10 rotates integrally with the gear 8, and an electric signal corresponding to the amount of rotation of the lever 1 is output from the potentiometer 9. This electric signal is inputted to a controller (not shown) that performs various processing, for example, and is further outputted from the controller as a drive signal for driving the working machine members.

Furthermore, when the operator returns the lever 1 one turn towards the neutral position, the shaft 2 rotates due to the force of the helical spring 5.
Lever 1 returns to neutral.

<Problems to be solved by the invention> By the way, in the prior art configured as described above,
An electric signal corresponding to the amount of rotation of the lever 1 is output through the engagement of the gear 7.8, and a gap is created between the teeth of the gear 7 and gear 8 that mesh with each other. , the amount of rotation of the lever 1 is transmitted to the potentiometer 9 through the gap between the gears 7 and 8, making it difficult to ensure good followability. For example, during a series of operations such as the neutral state of the lever 1 → a predetermined rotation of the lever 1 → the return of the lever 1 to the neutral position, a hysteresis loop is likely to be formed according to the above-mentioned gap, that is, when the lever 1 returns to its original position. It may not return to the neutral position correctly, which tends to cause deterioration in operating performance.

If the arrangement is made so that the gap is minimized to prevent the formation of such a hysteresis loop, even a slight rotation of the lever 1 will cause the potentiometer 9 to output an electrical signal, which means that the area where the lever 1 is in its neutral position will be output. There is no dead zone that forms, and operation stability cannot be achieved.

For this reason, in this conventional technology, gear 7
．． The position of each member, including the engagement of 8, must be adjusted with high precision, making manufacturing and assembly complicated, and
There are problems in terms of operability.

In addition, in this conventional technology, the lever 1 is
Since the potentiometer 9 outputs an electric signal related to the drive of one work implement member in response to the operation, when considering the drive of a plurality of work implement members, the electric lever device shown in Fig. 10.11 is used. A plurality of such devices must be installed in parallel, and in such a case, the size of the entire device becomes larger.

The present invention has been made in view of the actual situation in the prior art described above, and its purpose is to be able to output an electric signal according to the amount of rotation of a lever without intervening gear engagement, and to be able to perform multiple tasks. An object of the present invention is to provide an electric lever device that can be well adapted to driving machine parts.

Means for Solving the Problems In order to achieve this object, the present invention provides an apparatus that includes a lever and an output device that outputs an electric signal according to the amount of rotation of the lever. A pusher that moves in accordance with The linear stroke type sensor is provided with a casing in which a spring and a portion facing the pusher and the linear stroke type sensor are housed, and a ventilation hole is formed in the casing.

Since the present invention is configured as described above, the rotation of the lever is transmitted to the linear stroke type sensor through the movement of the pusher, and when the lever returns to neutral, the pusher is regulated by the force of the spring. It is possible to move to a position regulated by the member and output an electric signal without intervening any gear engagement.

Further, the dimension until the pusher and the linear stroke type sensor engage form a dead zone of the lever, and this dimension can be easily set, so that the dead zone can be easily set to a desired value.

Further, the neutral return position of the lever is always constant at a position regulated by the pusher or the regulating member, and no hysteresis loop is formed due to rotation and return of the lever.

In addition, without providing multiple levers etc., in other words, one
Since a plurality of pushers and a linear stroke type sensor that engages with the pushers can be provided around one lever, it is suitable for driving a plurality of working machine members.

<Example> Hereinafter, the electric lever device of the present invention will be explained based on the drawings.

FIG. 1 is an explanatory diagram including a cross section showing one embodiment of the present invention, FIG. 2 is a plan view showing the arrangement of pushers, and FIG.
Figures 4 and 5 are front and side views respectively showing the internal configuration of the linear stroke type sensor that forms the electric circuit of Figure 3. 6 are explanatory diagrams showing an example of the arrangement form of the embodiment shown in FIG. 1.

As shown in FIG. 1, in this embodiment, the lever 20 is
The lever 20 is made up of a rod 21 and a presser plate 22 which is integrally fixed to the lower end of the rod 21 and has a gently curved lower surface. Post 24 via joint 23
Supported by A thread is formed at the lower end of the column 24, and the column 24 is screwed into a screw hole formed in a casing 26 forming the main body through a sealing material 25. The casing 26 consists of an upper lid 27 and a box body 28 into which the upper lid 27 is integrally fitted.
8 is provided with a recess 29, a ventilation hole 30 communicating with the recess 29, and a filter 31 disposed in the ventilation hole 30.

Then, as shown in FIG.
(not shown here), four linearly movable pushers 32 are arranged so as to surround it. This pusher 32 is
It is provided so as to pass through the upper lid 27 of the casing 26 via a sealing material 33, and a large diameter portion 34 is provided at the lower end of the upper lid 27 of the casing 26.
The large diameter portion 34 has a protruding portion 35 that protrudes downward. The large diameter portion 34 of the pusher 32 described above is connected to the upper lid 27.
In other words, the upper lid 27 constitutes a regulating member that regulates the movement of the pusher 32 in the lever 20 direction. In addition, a pusher 3 is provided inside the casing 26.
A spring 36 is provided that biases the pusher 2 in the direction of the lever 20. One end of the spring 36 engages with the large diameter portion 34 of the pusher 32, and the other end engages with the bottom of the box body 28 of the casing 26. ing.

Further, an output device that outputs an electric signal corresponding to the pusher 32, that is, a linear stroke type sensor 37 is provided.
It is arranged. The sensor 37 is arranged so that its operating shaft 38 is located inside the casing 26, and furthermore, it is arranged so that it has a clearance 39 between it and the protrusion 35 of the pusher 32, which forms a dead zone for the lever 20. Further, a threaded portion 41 is formed around a guide portion 40 that guides the operating shaft 38. The sensor 37 is attached to the casing 26 through the seal member 25a so that the threaded portion 41 of the guide portion 40 is screwed into a tapped hole formed in the box body 28 of the casing 26. The threaded portion 41 of the pa guide portion 40 described above constitutes means for varying the dimensions of the clearance 39.

Further, as shown in FIG. 3, the sensor 37 described above includes an electric circuit having a switch 42 for detecting the neutral position of the lever 20 and a variable resistance section 43. This sensor 3
The internal structure of 7 is as shown in Fig. 4.5.
8 and a slider 44, 45 which is movable in the vertical direction as shown in FIG.
6. A conductor 47 that the slider 44 can selectively contact and that the slider 45 constantly contacts, a resistor 48 that is connected to the conductor 47, and a conductor 49 that the slider 45 constantly contacts. It has become a thing that has. In addition, the conductors 46 and 47 and the slider 4
4 constitute the switch 42 shown in FIG. 3 mentioned above, and the conductor 47, the resistor 48, the conductor 49 and the slider 45 constitute the variable resistance section 43 shown in FIG. 3.

As schematically shown, each sensor 37 is connected via a lead wire 50 to a control device, that is, a controller 51 that performs various signal processing.

As shown in FIG. 6, this controller 51 is connected to a driver circuit 53 that outputs a signal to drive a solenoid valve 52 that controls an actuator that drives a working machine member that is a movable member that constitutes a working machine. . As shown in FIG. 6, a switch 42 built into the sensor 37 is connected to a power source 54 of a driver circuit 53. As shown in FIG.

In addition, if the industrial machine 1 is a hydraulic excavator constituting a construction machine, the above-mentioned work machine components are a boom, an arm, a packet, a revolving structure, etc., and the above-mentioned actuator is a boom that rotates the boom. The solenoid valve 52 is a boom solenoid valve that controls a boom cylinder, an arm cylinder that rotates an arm, a packet cylinder that rotates a packet, a rotation motor that rotates a rotating structure, etc. These are the arm solenoid valve to control, the packet solenoid valve to control the packet cylinder, and the swing solenoid valve to control the swing motor.

In the embodiment configured as described above, when the lever 20 shown in FIG. 1 is rotated from the neutral position in the direction of arrow 55, for example, with the intention of driving a specific work equipment member, the presser foot of the lever 20 is rotated. A pusher 32 located on the left side in the figure moves downward through the plate 22 against the force of the spring 36. and,
The protrusion 35 of the pusher 32 is the operating shaft 3 of the sensor 37.
8 and further moves, the sliders 44, 45 shown in FIG. 4 move in the direction of arrow 56 in FIG. 4 integrally with the movement of the operating shaft 38. Then, the slider 14 is connected to the conductor 46.
．． 47, the switch 42 shown in FIG.
is turned on, and the power supply 54 shown in FIG. Further, a signal corresponding to the electric signal is output from the controller 51 to the driver circuit 53, and a drive signal is output from the driver circuit 53 to the drive section of the solenoid valve 52, which drives an actuator (not shown) to perform the corresponding operation. The work implement member is driven according to the amount of rotation of the lever 20. Note that when the lever 20 is rotated in the direction opposite to the direction of the arrow 55 in FIG. is driven in the direction of

When the lever 20 is returned to its original neutral position, the pusher 32 is moved through the return force of the spring 36 shown in FIG.
moves upward to a position where its large diameter portion 34 is regulated by the upper lid 27 of the casing 26, and along with this, the sensor 37
The actuating shaft 38 is also moved upward to the position shown in FIG.
As a result, the sliders 44 and 45 shown in FIG. 4 have a positional relationship as shown in FIG.
5 is away from the resistor (*48, then the slider 44 is connected to the conductor 4
7 and the switch 42 is turned off. When the slider 45 separates from the resistor 48 in this way, a signal is output from the sensor 37 to the controller 51 to set the corresponding work equipment member in the neutral position, and the solenoid valve is activated in accordance with the output signal from the driver circuit 53. 52 returns to the neutral position, and then the above-mentioned switch 42 is turned off, thereby turning off the power supply 54 and stopping the driving of the driver circuit 53.

When the lever 20 is rotated in the direction perpendicular to the arrow 55 in FIG. 1, that is, in the vertical direction perpendicular to the left-right direction in FIG. An electrical signal is output from the sensor 37,
It is also possible to drive another work implement member different from the work implement member described above.

For example, in the case of the above-mentioned hydraulic excavator, the lever 20
The boom can be driven by rotating in the left-right direction in FIG. 2, and the packet can be driven by rotating in the vertical direction.

In the embodiment configured as described above, the pusher 32 moves as the lever 20 rotates, and the pusher 3
Due to the movement of the operating shaft 38 of the sensor 37 in conjunction with the movement of 2,
That is, it is possible to output an electric signal from the sensor 37 according to the amount of rotation of the lever 20 without intervening any gear engagement.

In addition, the distance between the pusher 32 and the operating shaft 38 of the sensor 37, that is, the clearance 39, is the lever 2.
By appropriately rotating the threaded portion 41 of the guide portion 40 of the sensor 37, this clearance 39 can be easily set to a desired value, that is, the dead band can be easily set to the desired value. be able to. Although the dead zone can be easily set to a desired value in this way, in this embodiment, the pusher 32 is urged upward by the spring 36, and furthermore, the pusher 32 is pressed against the presser plate of the lever 20. Since it is in contact with 22, no play will occur.

Furthermore, in the neutral return position of the lever 20, the pusher 32 is always at a constant position regulated by the upper lid 27 of the casing 26, that is, the regulating member. There is no formation, and stable operability can be obtained.

Furthermore, by providing two pairs of pushers 32, that is, four pushers 32, for driving two work equipment members around one lever 20, the two work equipment members can be driven, and the device can be made smaller. Can be done.

Furthermore, by forming the clearance 39 between the pusher 32 and the operating shaft 38 of the sensor 37 as described above,
Even if vibration is transmitted to the lever 20 in the neutral state due to some kind of operation, this vibration will not be transmitted to the operating shaft 38, and therefore no false signal will be output from the sensor 3.7, resulting in excellent safety. ing.

Moreover, since the sensor 37 is equipped with a switch 42 that detects the neutral position of the lever 20, even if a failure or noise occurs in the signal system including the controller 51, when the lever 20 is in the neutral position, the above-mentioned power supply 5
4 is turned off, the driving of the driver circuit 53 is stopped, and thereby the solenoid valve 52 returns to the neutral position, and the corresponding work equipment member automatically assumes a configuration corresponding to the neutral state of the lever 20. However, it has excellent safety.

Furthermore, since the ventilation hole 30 is provided in the casing 26 as described above, the pressure inside the casing 26 is kept constant regardless of the movement of the pusher 32, and the pressure inside the casing 26 is kept constant, so that the sensor 37, the seal members 25, 25a, 33, etc. are not forced. No load is applied and it has excellent durability.

Since the box body 28 of the casing 26 is provided with a recess 29, even if water droplets accumulate in the casing 26 due to changes in ambient temperature, the water droplets will be stored in the recess 29 and the filter 31 will be removed. This allows the sensor 37 to be protected from water droplets.

Furthermore, since the filter 31 is provided in the ventilation hole 30 of the casing 26, external dust and the like will not enter the cage jig 26, and from this point of view as well, the sensor 37 can be protected.
Each sliding part can be protected.

Note that if water droplets form in the two depressions mentioned above, the water droplets will pass through the filter 31 when flowing out of the casing 26, so the filter 31 will be washed and the filter 31 will always be kept clean. You can keep it.

FIG. 7 shows a switch 42 built into the sensor 37 mentioned above.
8.9 is an electric circuit diagram showing another example of the arrangement of the variable resistance section 43, and FIGS. 8 and 9 are a front view and a side view, respectively, showing the internal structure of the sensor 37 having the electric circuit shown in FIG.

As shown in FIG. 8.9, the arrangement of the conductor, resistor, and slider may be changed as appropriate.

<Effects of the Invention> As described above, the electric lever device of the present invention has a structure in which the rotation of the lever is transmitted to the linear stroke type sensor as movement of the pusher. It is possible to output an electrical signal according to the amount of movement, and therefore, it is possible to eliminate the occurrence of hysteresis loops that occur when gear engagement is involved, and it is also possible to set a desired dead zone, providing superior operation compared to conventional methods. safety and safety.

In addition, multiple pairs of pushers can be driven with one lever, and electric signals can be output from the corresponding linear stroke type sensors, making it well suited for driving multiple work equipment members. In some cases, the device can be made smaller than the conventional method.

In addition, a casing is provided in which the spring and the facing part of the pusher and the linear stroke sensor are housed, and a ventilation hole is formed in this casing, so that the pressure inside the casing is kept constant regardless of the movement of the pusher, and the sensor, No unreasonable load is applied to the sealing member, etc., and it has excellent durability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram including a cross section showing one embodiment of the electric lever device of the present invention, FIG. 2 is a plan view showing the arrangement of a pusher, and FIG. 3 is a diagram showing an embodiment of the electric lever device shown in FIG. Figures 4 and 5 are front and side views showing the internal configuration of the linear stroke sensor that forms the electric circuit in Figure 3, and Figure 6 is Figure 1. 7 is a diagram showing another aspect of the electric circuit of the linear stroke type sensor shown in FIG. 1, and FIG. A front view and a side view respectively showing the internal structure of a linear stroke type sensor forming an electric circuit, FIG. 10 is a side view showing a conventional electric lever device, and FIG. 11 is a view taken in the direction of arrow A in FIG. be. 20... Lever, 21... Rod body, 22
...Press plate, 23... Universal joint, 24... Support column, 25.25a, 33
・Old...Seal material, 26...Casing, 27
・・Eyes・・Upper lid, 28・・Old・・700 bodies, 2・・・・
...Indentation, 30...Vent hole, 31.Old...Filter, 32...Pusher, 34...
Large diameter part, 35...Protruding part, 36...Spring, 37...Linear l-roke type sensor (output device), 38...Operating shaft, 3... Clearance, 40... Guide section, 41...
...Screw part, 42...Switch, 43...
...Variable resistance section. ) Adjacent 1σ- Figure 6 Figure 7 Figure 8 Figure 10 Figure 11

Claims (1)

[Claims] (1) In an electric lever device that includes a lever and an output device that outputs an electric signal according to the amount of rotation of the lever, there is a pusher that moves in accordance with the rotation of the lever, and a pusher that moves in the direction of the lever. The output device includes a regulating member that regulates movement, and a spring that biases the pusher in the direction of the lever, and the output device includes a linear stroke type sensor that can be engaged with the pusher. An electric lever device characterized in that a casing is provided in which an opposing part of a linear stroke type sensor is housed, and a ventilation hole is formed in the casing.