JP2003051231A - Electrical-type operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical-type operating device in which the width size matched in the shaft direction of a support shaft of a swing member can be made smaller, and in which a potentiometer can be positioned on a lower side of installation part. SOLUTION: This device has gimbals 24, 25 to swing with a swinging of a control lever 22, support shafts 28a, 28b, 29a, 29b to support and to integrally swing with these gimbals 24, 25, and rotating shafts 31, 33 for rotating with the swinging of the support shafts 28a, 29a, and this is provided with the potentiometers 32, 34 to output a rotation-angle signal to drive an actuator, and with a transfer means for conveying a swinging action of the control lever 22 as a rotary action of the rotating shafts 31, 33 of the potentiometers 32, 34. The potentiometers 32, 34 are arranged, so that the principal part will be positioned in the lower region in between the outer end of the support shaft 28a or 29a and the outer end of the support shaft 28b or 29b, and further so that the rotating shaft 31 or 33 will be in parallel with the support shaft 28a or 29a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric operating device which is provided in a construction machine such as a hydraulic excavator and has a potentiometer which outputs an electric signal according to a swing angle of an operating member.

[0002]

7 and 8 are explanatory views showing a conventional electric operating device described in Japanese Utility Model Laid-Open No. 7-38852, FIG. 7 is a front view and FIG. 8 is a side view.

This electric operating device is provided for a traveling system of a construction machine. As shown in FIG. 7, operating members such as pedals 1 and 2 and these pedals 1 and 2 are integrally rocked. A swinging member that moves, for example, cams 3 and 4, cam shafts 5 and 6 that form a support shaft for these cams 3 and 4, and a rotary shaft is directly connected to the ends of these cam shafts 5 and 6. The potentiometers 7 and 8, the pedals 1 and 2, the cams 3 and 4, the cam shafts 5 and 6 integrally provided with these cams 3 and 4, and the potentiometers 7 and 8 are supported, and the floor of the cab of the construction machine concerned. A holder 9 fixed to a surface or the like, a bellows 10 for covering the cams 3, 4, the cam shafts 5, 6, and the potentiometers 7, 8.
11 and a box 1 provided in the central portion below the holder 9
2 and a substrate 13 provided in the box body 12 for processing an electric signal corresponding to the rotation angle output from the potentiometers 7 and 8.

As shown in FIG. 8, a casing 14 is disposed below the holder 9 on the left and right sides of the box body 12, for example, on the right side of FIG.
Push rods 15 and 16 that can move up and down in accordance with the swing of the cam 3 are provided in the four parts, and an operation reaction that applies a reaction force to the pedal 1 through the push rods 15 and 16 is provided in the casing 14. Force springs 17 and 18 are arranged.

In the prior art thus constructed, for example, when an operator of the construction machine steps on the pedal 1, the pedal 1 swings, and the cam 3 and the cam shaft 5 also swing integrally with the pedal 1. The rotation shaft of the potentiometer 7 rotates, and a rotation angle signal corresponding to the operation amount of the pedal 1 is output from the potentiometer 7 to the substrate 13. In accordance with the signal processed by the substrate 13, for example, a traveling motor (not shown) is driven to control the traveling speed. Further, as the cam 3 swings, the corresponding one of the push rods 15 and 16 descends, the corresponding one of the operation reaction force springs 17 and 18 is bent, and the spring force thereof is applied. A corresponding one of 15 and 16 is applied to the pedal 1 via the cam 3, and the operator can feel the reaction force corresponding to the depression amount of the pedal 1 with the body.

[0006]

The above-described electric operating device is provided in the front portion of the driver's seat on the floor of the driver's cab, etc., but when the operating member is the operating lever, it is placed on the side of the driver's seat. Sometimes. In any case, it is generally placed in a limited place in the installation area.

By the way, in the above-mentioned conventional electric operating device, taking the pedal 1 side as an example, the cam shaft 5 and the rotary shaft of the potentiometer 7 are directly connected to each other. And a large width L of the length of the potentiometer 7 in the direction of the rotation axis are required.
The layout design is subject to restrictions. In order to facilitate the layout design, the width dimension L may be reduced. in this case,
Conventionally, it is conceivable to make the potentiometer 7 small, but if the potentiometer is made small in this way, the detection accuracy of the rotation angle deteriorates, and the reliability becomes poor. It is difficult to adopt it for a device requiring high control accuracy such as.

Particularly, in the case of a hydraulic excavator such as a mini excavator, the driver's cab is extremely small, and the installation area for each device and member in the operator's cab is small.
It is difficult to install an electric operating device with a large size.

Further, since the above-mentioned electric operating device is arranged above the potentiometers 7 and 8, the potentiometers 7 and 8 are located above the floor surface of the driver's cab or the like. Therefore, when the operator moves in the driver's cab, or when some kind of equipment is brought into the driver's cab, external force is applied to the potentiometers 7 and 8, and the potentiometers 7 and 8 may be damaged. .

The present invention has been made from the above-mentioned actual state of the art, and its object is to make it possible to reduce the width dimension corresponding to the axial direction of the support shaft of the swinging member and to install the potentiometer in the installation portion. An object is to provide an electric operating device that can be positioned on the lower side.

[0011]

In order to achieve the above object, an invention according to claim 1 of the present application is an operating member which is rocked by an operator and drives an actuator, and an operating member which is rocked with the operating member. A rocking member that rocks
A potentiometer that has a support shaft that supports the swing member, a swing shaft that rotates with the swing of the swing member, and that outputs a rotation angle signal for driving the actuator; An electric operating device comprising: a transmission means for transmitting a swinging motion of a moving member as a rotary motion of the rotary shaft of the potentiometer, wherein the potentiometer has a main portion located below an outer end of the support shaft. It is arranged such that it is located in the region of (3) and its rotation axis is parallel to the support axis.

In the invention according to claim 1 having such a structure, when the operating member is rocked, the rocking member integrally rocks, and the rocking motion of the rocking member is transmitted via the transmission means to the potentiometer. Is transmitted to the rotary shaft of the rotary actuator, and the rotary shaft rotates to output a rotary angle signal from the potentiometer. The actuator is driven according to the rotation angle signal.

Since the main part of the potentiometer is arranged below the support shaft for supporting the swinging member, and the pivot shaft is parallel to the support shaft, the potentiometer is arranged in the axial direction of the support shaft. It is possible to reduce the width dimension corresponding to, and it is possible to relax the restrictions on the layout design. Therefore, it is not necessary to make the potentiometer particularly small, and reliable rotation angle detection accuracy can be secured.

Further, even if the rocking member is located above the installation section of the electric operating device, the potentiometer can be located below the above-mentioned installation section, thereby acting above the installation section. It is possible to eliminate the adverse effect on the potentiometer due to some external force.

The invention according to claim 2 of the present application is the invention according to claim 1, wherein the swinging member includes a pair of gimbals arranged in directions orthogonal to each other, and each of the pair of gimbals is provided. The support shafts are integrally provided, and a pair of potentiometers, each of which rotates the pivot shaft in accordance with the swing of the support shafts, is provided.

With this structure, the operation amount of the operation member in all directions can be detected by the potentiometers arranged in the XY directions which are orthogonal to each other. Therefore, a plurality of actuators can be selectively driven by setting the relationship between the operation direction and each of the actuators to be driven in advance.

According to a third aspect of the present invention, in the second aspect of the invention, the transmission means is provided integrally with each of the support shafts, and an extension arm extending in the potentiometer direction, The extension arms are engaged with the extension arms so as to be rotatable in a vertical plane parallel to the vertical plane including the rotation area of the extension arms, and are integrally provided on the respective rotation shafts of the potentiometer. It is configured to include a rotating arm.

According to a fourth aspect of the present invention, in the invention according to the third aspect, the gimbal, the support shaft, the extension arm, the rotating arm, and the potentiometer having the rotating shaft. And a housing that forms an outer shell.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the basic shape of the housing is formed into a cylindrical shape, and the inner diameter of the housing is the center of the housing and the extension arm. The configuration is set to be larger than the length of a straight line in a plane connecting the limit point of the moving region.

With such a configuration, the projected area of the electric operating device can be set to the minimum, so that it is more suitable for installation in a limited place where the area of the installation area is small.

According to a sixth aspect of the present invention, in the first aspect of the invention, the swinging member includes a cam, and a supporting shaft for rotatably supporting the cam is provided, and the transmitting means is An extension arm that is provided integrally with the cam and that extends in the potentiometer direction, and the extension arm that is rotatable in a vertical plane parallel to a vertical plane that includes a rotation region of the extension arm. And a rotary arm integrally provided on the rotary shaft of the potentiometer.

With this structure, it is possible to detect a specific unidirectional operation amount of the operation member. Therefore, it is suitable when only a predetermined single actuator such as a traveling motor is driven.

The invention according to claim 7 is the invention according to claim 3 or 6, wherein the extension arm portion from the engagement point of the extension arm and the rotating arm to the center of the support shaft is The length is set to be longer than the length of the rotating arm portion from the engagement point to the center of the rotating shaft of the potentiometer.

In the structure thus constructed, the swing member,
The change in the rotation angle of the potentiometer with respect to the swing angle of the support shaft can be increased, the resolution can be increased, and high detection accuracy can be ensured.

The invention according to claim 8 of the present application is the structure according to any one of claims 1 to 7, wherein the operating member is an operating lever.

The invention according to claim 9 of the present application is, in the invention according to any one of claims 1 to 8, configured to include a reaction force applying means for applying an operation reaction force to the operation member.

Further, the invention according to claim 10 of the present application is such that, in the invention according to any one of claims 1 to 9, it is installed in a console of a mini excavator.

The present invention is particularly effective because the console area of a mini excavator generally has a significantly small installation area.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an electric operating device of the present invention will be described below with reference to the drawings.

1 to 4 are explanatory views showing a first embodiment of the present invention. FIG. 1 is a vertical sectional view, FIG. 2 is a plan view, and FIG. 3 is a sectional view of an essential part corresponding to the arrow A of FIG. FIG. 4 is a longitudinal sectional view showing a state during operation of the first embodiment.

The first embodiment is arranged, for example, in the cab of a mini excavator. Reference numeral 19 indicated by a chain double-dashed line in FIGS.

As shown in FIGS. 1 and 2, this first embodiment has a housing 21 having an outer shell and a mounting portion 20 to be mounted on a mounting portion 19 of the console, and a basic shape of a housing 21. An operating member, for example, an operating lever 22, which is rocked by an operator and selectively drives actuators such as a boom cylinder, an arm cylinder, a bucket cylinder, and a swing motor (not shown) is provided.

In the housing 21, the following parts are
The equipment is stored.

That is, the main body 23 and the swing member that swings with the swing of the operation lever 22 are provided. As shown in FIG. 2, for example, the swinging member is provided with a first gimbal 24 extending in the X direction, which is the left-right direction, and a first gimbal 24. A second gimbal 25 extending in a certain Y direction and the first gimbal 25
It includes a cam 26 that swings integrally with the gimbal 24 and the second gimbal 25, and a universal joint 27 that is provided in the main body 23 and that swingably supports the cam 26 in the 360 ° direction.

Further, as shown in FIG. 2, the first gimbal 2
4, a pair of support shafts 28a and 28b that swing together with the second gimbal 25, and a pair of support shafts 29a that swing together with the second gimbal 25.
29b. These support shafts 28a, 28b,
As shown in, for example, FIG. 3, 29a and 29b are rotatably supported by bearings 30 provided in the main body 23, that is, rotatably. Also, these support shafts 28
The a, 28b, 29a and 29b are arranged at the same height position as the rotation center of the universal joint 27.

The outer end of the support shaft 28a that swings integrally with the first gimbal 24, that is, the end portion located on the inner wall side of the housing 21, and the outer end of the support shaft 28b, that is, the end located on the inner wall side of the housing 21. A rotation shaft 31 that rotates with the swing of the support shaft 28a so as to be located in a lower region between the first and second portions, and outputs a rotation angle signal for driving an actuator (not shown). 1 potentiometer 32
Has been placed. The first potentiometer 32 is fixed to the main body 23, and its rotation shaft 31 is positioned so as to be parallel to the support shaft 28a.

Similarly, the outer end of the support shaft 29a that swings integrally with the second gimbal 25, that is, the end portion located on the inner wall side of the housing 21, and the outer end of the support shaft 29b, that is, the inner wall side of the housing 21, are arranged. It has a rotary shaft 33 that rotates in accordance with the swing of the support shaft 29a so as to be located in a region below the end portion where it is located, and outputs a rotary angle signal for driving an actuator (not shown). A second potentiometer 34 for outputting is arranged. This second potentiometer 3
4 is also fixed to the main body 23, and its rotation shaft 33 is the support shaft 2
It is positioned so as to be parallel to 9a.

The swing motion of the support shaft 28a that swings integrally with the first gimbal 24 is controlled by the first potentiometer 32.
A first transmission means for transmitting the rotation movement of the rotation shaft 31 of
The second gimbal 25 is provided with second transmitting means for transmitting the swinging motion of the support shaft 29a swinging integrally with the second gimbal 25 as the swinging motion of the rotary shaft 33 of the second potentiometer 34.

The above-mentioned first transmission means is, for example, the support shaft 2.
8a is provided integrally with the first extension arm 35 extending in the direction of the first potentiometer 32, and the first extension arm 35 is rotatable in a vertical plane parallel to a vertical plane including a rotation region of the first extension arm 35. The first rotation arm 36 is provided so as to be engaged with the first extension arm 35 so as to be integrated with the rotation shaft 31 of the first potentiometer 32.

At the lower end of the first extension arm 35, for example, a long groove 37 whose lower part is opened is formed, and at the upper end of the first rotating arm 36, the long groove 37 is movably engaged in the longitudinal direction. A protrusion 38 is provided.

First extension arm 35 and first rotating arm 36
Of the first extension arm 35 from the center of the projection 38 to the center of the support shaft 28a, that is, from the center of the projection 38 to the rotation axis 3 of the first potentiometer 32.
The length is set in advance as compared with the length of the first rotating arm 36 portion up to the center of 1.

Similarly, the above-mentioned second transmission means is also provided integrally with the support shaft 29a, and the second potentiometer 3 is provided.
The second extension arm 39 extending in four directions and the second extension arm 39 are engaged with the second extension arm 39 so that the second extension arm 39 can rotate within a vertical plane parallel to a vertical plane including a rotation area of the second extension arm 39. The rotary shaft 33 of the second potentiometer 34
And a second rotating arm 40 that is integrally provided in the.

At the lower end of the second extension arm 39, for example, a long groove 41 whose lower part is opened is formed, and at the upper end of the second rotating arm 40, the long groove 41 is movably engaged in the longitudinal direction. A protrusion 42 is provided.

Second extension arm 39 and second rotating arm 40
Of the second extension arm 39 from the center of the protrusion 42 to the center of the support shaft 29a, from the center of the protrusion 42 to the rotation axis 3 of the second potentiometer 34.
The length is set in advance longer than the length of the second rotating arm 40 portion up to the center of 3.

The inner diameter of the housing 21 is
The center 43 of the housing 21 shown in FIG. 2 and two limit points of the rotation area of the first extension arm 35 (the first extension arm 35).
The length of a straight line on each of the planes connecting the swinging movement limit position) and the center 43 of the housing 21 and the two limit points of the rotation region of the second extension arm 39 (the second extension arm 3).
9 is set in advance so as to be slightly larger than the length of the straight line on the plane connecting each of the positions (9, the limit position of the swing motion).

Further, the first embodiment is provided with a reaction force applying means for applying an operation reaction force to the operation lever 22.
The reaction force applying means is provided on the main body 23 so as to be movable up and down, and further, the pair of push rods 44 arranged below the first gimbal 24 and the push rods 4 are provided.
4, a pair of push rods 45 provided on the main body 23 so as to be movable up and down and arranged below the second gimbal 25, and a pair of push rods 45 as shown in FIG. The push rod 45 includes a spring 46 that applies an operation reaction force.

In the first embodiment having such a configuration, the operator of the mini excavator grips the operation lever 22 and moves the operation lever 22 in the right direction in FIG. 1, that is, the X direction which is the left and right direction in FIG. When the swing operation is performed, the second gimbal 25, the support shafts 29a and 29b, and the cam 26 integrally swing, and the second extension arm 39 rotates with the support shaft 29a as a fulcrum as the support shaft 29a swings. To do. Along with this, as shown in FIG. 4, the second rotation arm 40 rotates through the long groove 41 of the second extension arm 39 and the protrusion 42 of the second rotation arm 40, and is integrated with this. Then, the rotation shaft 33 of the second potentiometer 34 rotates. That is, the rotation angle signal corresponding to the operation amount of the operation lever 22 in the X direction is output from the second potentiometer 34. A predetermined actuator, for example, a boom cylinder is driven according to the rotation angle signal, and the driving speed thereof is controlled.

Further, for example, in the direction orthogonal to the plane of FIG.
That is, the operation lever 22 is moved in the Y direction, which is the front-back direction of FIG.
Is operated, the first gimbal 24 and the support shafts 28a, 28
b and the cam 26 swing together, and the first extension arm 35 rotates about the support shaft 28a as a fulcrum as the support shaft 28a swings. Accordingly, the long groove 37 of the first extension arm 35,
And the protrusion 38 of the first rotation arm 36,
The rotating arm 36 rotates, and the rotating shaft 31 of the first potentiometer 32 rotates integrally with the rotating arm 36. That is, the rotation angle signal corresponding to the operation amount of the operation lever 22 in the Y direction is the first
It is output from the potentiometer 32. Another actuator, which is predetermined according to the rotation angle signal,
For example, the arm cylinder is driven and the driving speed thereof is controlled.

Further, for example, when the operation lever 22 is operated diagonally downward to the right, which is an intermediate direction of the XY directions in FIG. 2, the first gimbal 24, the second gimbal 25, and the support shafts 28a, 28.
b, 29a, 29b and the cam 26 swing together, and the first extension arm 3 moves as the support shafts 28a, 29a swing.
5. The second extension arm 39 rotates about the support shafts 28a and 29a as fulcrums. Along with this, through the long groove 37 and the protrusion 38, and also through the long groove 41 and the protrusion 42, the first
The rotating arm 36 and the second rotating arm 40 rotate, and the rotating shaft 31 of the first potentiometer 32 and the second rotating arm 40 rotate integrally with the rotating arm 36 and the second rotating arm 40.
The rotary shaft 33 of the potentiometer 34 rotates. That is, a rotation angle signal corresponding to the operation direction and the operation amount of the operation lever 22 is output from each of the first potentiometer 32 and the second potentiometer 34. In accordance with these rotation angle signals, another predetermined actuator, for example, a bucket cylinder is driven, and the drive speed thereof is controlled.

Further, for example, when the operation lever 22 is operated diagonally downward to the left, which is the intermediate direction of the XY directions in FIG. 2, a rotation angle signal corresponding to the operation direction and the operation amount of the operation lever 22 is generated in the same manner as described above. It is output from each of the first potentiometer 32 and the second potentiometer 34. In accordance with these rotation angle signals, another predetermined actuator, for example, a swing motor is driven, and the drive speed thereof is controlled.

During each of the above-mentioned operations, the corresponding one of the push rods 44 and 45 descends as the cam 26 swings, and the corresponding one of the springs 46 and the like bends. The spring force is applied to the operation lever 22 through the corresponding one of the push rods 44 and 45 and the cam 26, so that the operator can feel the reaction force according to the operation amount by the body. According to the first embodiment described above, the main part of the first potentiometer 32 is located below the outer ends of the support shafts 28a, 28b supporting the first gimbal 24, and the rotating shaft 31 serves as the support shaft 28a. The first potentiometer 32 is arranged so as to be parallel, and the main part of the second potentiometer 34 is
Since the second potentiometer 34 is arranged below the outer ends of the support shafts 29a and 29b that support the gimbal 25, and the rotation shaft 33 is parallel to the support shaft 29a, The width dimension corresponding to the axial direction of the shafts 28a and 28b and the width dimension corresponding to the axial directions of the support shafts 29a and 29b can be reduced, respectively, to relax the constraint on the layout design and increase the freedom of layout. be able to. Therefore, the first potentiometer 3
The second and second potentiometers 34 do not have to be downsized, and highly reliable rotation angle detection accuracy can be secured respectively.
A boom cylinder driven by operating the operation lever 22,
It is possible to selectively control a plurality of actuators such as an arm cylinder, a bucket cylinder and a swing motor with high accuracy. Accordingly, the mini excavator is suitable for those requiring a high detection accuracy of the rotation angle and having a place such as a driver's cab where a relatively narrow installation area can be secured.

Also, the first gimbal 24 and the second gimbal 2
Although the rocking member including the cam 5, the cam 26, and the universal joint 27 is arranged above the installation portion 19 of the console, the first potentiometer 32 and the second potentiometer 34 can be located below the installation portion 19. Therefore, it is possible to eliminate an adverse effect on the first potentiometer 32 and the second potentiometer 34 due to the external force acting above the installation portion 19. Therefore, the potentiometer can be prevented from being damaged by the external force as described above, and the durability of the entire device can be improved.

Also, the first gimbal 24 and the second gimbal 2
5, the first potentiometer 32 and the second potentiometer 34 are respectively arranged in the XY directions, so that the operation lever 2
The first potentiometer 32 and the second potentiometer 3 output the rotation angle signals according to the manipulated variable in all directions of No. 2 of FIG.
4 can be output. Therefore, a plurality of actuators can be selectively driven by presetting the relationship between the operating direction of the operating lever 22 and each of the actuators to be driven. It is suitable as an operating device for mini excavators.

Further, the housing 21 has a cylindrical basic shape, and the inner diameter thereof hinders the rotation operation of the first extension arm 35, the first rotation arm 36, the second extension arm 39, and the second rotation arm 40. Since the diameter is set to the minimum in the range that does not occur, the projected area of the electric operating device can be set to the minimum, which is suitable for arranging in a more limited place in the setting area. From this point, it is suitable for being installed in the console of the operator's cab of the mini excavator, which can secure a relatively narrow installation area.

The length of the portion of the first extension arm 35 from the projection 38 forming the engagement point of the first extension arm 35 and the first rotation arm 36 to the center of the support shaft 28a is set to the projection 38. The length is set longer than the length of the first rotating arm 36 portion up to the center of the rotating shaft 31 of the first potentiometer 32, and the engagement point between the second extension arm 39 and the second rotating arm 40 is formed. From the protrusion 42 to the support shaft 29
The length of the second extension arm 39 portion up to the center of a is determined from the protrusion 42 to the rotation shaft 3 of the second potentiometer 34.
Since the length is set longer than the length of the second rotation arm 40 up to the center of 3, the change in the rotation angle of the first potentiometer 32 with respect to the swing angle of the first gimbal 24 and the support shaft 28a, The change in the rotation angle of the second potentiometer 34 with respect to the swing angles of the second gimbal 25 and the support shaft 29a can be increased respectively, the resolution can be increased, and highly reliable rotation angle detection accuracy can be ensured. Can be driven with high control accuracy.

FIG. 5 is a vertical sectional view showing a second embodiment of the present invention, and FIG. 6 is a sectional view corresponding to the arrow C in FIG.

This second embodiment is also arranged in the driver's cab of a mini excavator, for example. In the second embodiment, for example, the floor 50 of the driver's cab constitutes an installation section in which the second embodiment is installed.

As shown in FIGS. 5 and 6, in the second embodiment, a holder 51 attached to the floor 50 of the operator's cab, a casing 52 provided integrally with the holder 51, and a swing operation by an operator, A specific single actuator, for example, a traveling lever 53 that drives a traveling motor is provided.

The box formed by the holder 51 and the casing 52 is equipped with the following parts and equipment.

That is, a swinging member that swings with the swing of the traveling lever 53, for example, a cam 54, a support shaft 55 that rotatably supports the cam 54, and the outer ends of the support shaft 55. A rotary shaft 56 that rotates in accordance with the swing of the cam 54 is provided so as to be positioned below the potentiometer 57, and a potentiometer 57 that outputs a rotary angle signal for driving a traveling motor (not shown) is arranged. .

Further, the extension arm 58 provided integrally with the cam 54 and extending in the direction of the potentiometer 57, and the extension arm 58 can be rotated within a vertical plane parallel to the vertical plane including the rotation region of the extension arm 58. The rotary arm 59 is provided so as to be engaged with the extension arm 58 so as to be integrally formed with the rotary shaft 56 of the potentiometer 57.

At the lower end of the extension arm 58, for example, a long groove 60 whose lower portion is opened is formed, and at the upper end of the rotating arm 59, a projection 61 which is movably engaged in the longitudinal direction of the long groove 60 is provided. There is.

The engagement point between the extension arm 58 and the rotation arm 59, that is, the length of the extension arm 58 portion from the center of the protrusion 61 to the center of the support shaft 55 is determined by the rotation axis of the potentiometer 57 from the center of the protrusion 61. It is set longer in advance than the length of the rotating arm 59 portion up to the center of 56.

Extension arm 58 having the long groove 60 described above.
The rotating arm 59 having the projection 61 constitutes a transmitting means for transmitting the swinging motion of the cam 54 as the rotary motion of the rotary shaft 56 of the potentiometer 57.

Also in the second embodiment, as a reaction force applying means for applying an operation reaction force to the traveling lever 53,
The holder 51 and the casing 52 are provided so as to be vertically movable, and include a pair of push rods 62 arranged below the cam 54, and a spring 63 that applies an operation reaction force to the push rods 62.

In the second embodiment thus configured, when the operator of the mini excavator swings the traveling lever 53, the cam 54 swings integrally, and the extension arm 58 is swung along with the swing of the cam 54. Rotates about the support shaft 55 as a fulcrum. Along with this, the rotary arm 59 rotates via the long groove 60 of the extension arm 58 and the protrusion 61 of the rotary arm 59, and integrally with this, the rotary shaft 56 of the potentiometer 57.
Rotates. That is, the rotation angle signal corresponding to the operation amount of the traveling lever 53 is output from the potentiometer 57. The traveling motor is driven according to the rotation angle signal, and the driving speed thereof is controlled.

During such an operation, as the cam 54 swings, the corresponding one of the push rods 62 descends, the corresponding one of the springs 63 is bent, and the spring force thereof is increased. A corresponding one of the push rods 62, which is given to the traveling lever 53 via the cam 54, allows the operator to feel the reaction force corresponding to the operation amount with the body.

Also in the second embodiment having such a configuration, the main portion of the potentiometer 57 is located below the outer ends of the support shaft 55 and the rotating shaft 56, as in the first embodiment. Since the potentiometer 57 is arranged so that is parallel to the support shaft 55, the width dimension corresponding to the axial direction of the support shaft 55 can be reduced, and the restriction on the layout design is relaxed and the degree of freedom of layout is improved. Can be increased, and the same effect as the first embodiment can be obtained.

Further, although the cam 54 is arranged on the upper side of the floor 50, the potentiometer 57 can be positioned on the lower side of the floor 50, which allows the potentiometer 57 to be located above the floor 50 as in the first embodiment. It is possible to eliminate an adverse effect on the potentiometer 57 due to some external force that acts in (1), and an effect equivalent to that of the first embodiment can be obtained.

Further, the length of the extension arm 58 portion from the protrusion 61 forming the engaging point of the extension arm 58 and the turning arm 59 to the center of the support shaft 55 is set from the protrusion 61 to the center of the turning shaft 56. Since it is set to be longer than the length of the rotating arm 59 up to this point, it is possible to increase the change in the rotating angle of the potentiometer 57 with respect to the swing angle of the cam 54, which is equivalent to the first embodiment. The effect of is obtained.

Further, the potentiometer 57 can be arranged in the dead space of the casing 52 formed between the pair of push rods 62, and the dead space of the casing 52, which has not been utilized conventionally, can be effectively utilized.

Although the traveling lever 53 is provided as the operation member in the second embodiment, a pedal may be provided instead of the traveling lever 53.

In the first and second embodiments, the transmission means for transmitting the swinging motion of the swinging member as the rotary motion of the rotary shaft of the potentiometer is a combination of the extension arm and the rotary arm. Not limited to such a link structure, a gear mechanism or a belt transmission mechanism may be provided.

[0074]

According to the inventions according to each of the claims of the present application, the width dimension corresponding to the axial direction of the support shaft of the rocking member can be reduced, and the restrictions on the layout design can be relaxed as compared with the prior art, and the freedom of layout can be achieved. The degree can be increased. Therefore, the potentiometer does not have to be downsized, reliable rotation angle detection accuracy can be ensured, and the actuator driven by operating the operation member can be controlled with high accuracy.
Therefore, it is suitable to be provided in a construction machine such as a construction machine which requires a high rotation angle detection accuracy of a potentiometer and has a place such as a driver's cab where a relatively narrow installation area can be secured.

Further, the potentiometer can be located below the installation portion where the electric operating device is installed, and this adversely affects the potentiometer by some external force acting above the installation portion, which has been apt to occur in the past. Can be eliminated. Therefore, it is possible to prevent the potentiometer from being damaged due to the external force as described above, and it is possible to improve the durability of the entire device as compared with the conventional one.

Further, in particular, according to the invention of claim 2,
It is possible to selectively drive a plurality of actuators, and from this point, it is suitable as an operating device for a construction machine generally provided with a plurality of actuators.

Further, the invention according to claim 5 is particularly suitable for installation in a more limited place in the installation area because the installation area is small. From this point, it is suitable to be installed in the cab of a construction machine in which only a relatively narrow installation area can be secured.

In particular, the invention according to claim 6 can detect a specific unidirectional operation amount. Therefore,
When provided on a construction machine, only a predetermined single actuator such as a traveling motor can be driven.

Further, in particular, the invention according to claim 7 can increase the change of the rotation angle of the potentiometer with respect to the swing angle of the support shaft. As a result, more reliable rotation angle detection accuracy can be secured, and the actuator can be driven with high control accuracy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of an electric operating device of the present invention.

2 is a plan view of the first embodiment shown in FIG. 1. FIG.

3 is a cross-sectional view of a main part corresponding to the direction of arrow A in FIG.

FIG. 4 is a vertical cross-sectional view showing a state during operation of the first embodiment shown in FIG.

FIG. 5 is a vertical sectional view showing a second embodiment of the present invention.

6 is a cross-sectional view corresponding to the arrow C of FIG.

FIG. 7 is a front view showing a conventional electric operating device.

8 is a side view of the electric operating device shown in FIG. 7. FIG.

[Explanation of symbols]

19 Installation Department 20 Mounting part 21 housing 22 Operation lever (operation member) 23 body 24 1st gimbal (oscillating member) 25 2nd gimbal (oscillating member) 26 Cam (Rotating member) 27 Universal joint 28a support shaft 28b support shaft 29a support shaft 29b support shaft 30 bearings 31 rotation axis 32 1st potentiometer 33 rotation axis 34 Second Potentiometer 35 First Extension Arm (Transmission Means) 36 First Rotating Arm (Transmission Means) 37 Long groove 38 Protrusion 39 Second extension arm (transmission means) 40 Second rotation arm (transmission means) 41 long groove 42 protrusion 43 center 44 Push rod (reaction force applying means) 45 Push rod (reaction force applying means) 46 spring (reaction force applying means) 50 floors 51 holder 52 casing 53 Travel lever (operation member) 54 Cam (Rotating member) 55 Support shaft 56 rotation axis 57 Potentiometer 58 Extension Arm (Transmission Means) 59 Rotating arm (transmitting means) 60 long groove 61 protrusions 62 Push rod (reaction force applying means) 63 spring (reaction force applying means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Higashiga ▲ Saki ▼ Mitsuhisa             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Katsura Nasu             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory F-term (reference) 2D003 AA00 AC06 BA02 DA04 DB04                       EA01

Claims (10)

[Claims] 1. An operating member which is rocked by an operator and drives an actuator, a rocking member which rocks with the rocking of the operating member, a support shaft which supports the rocking member, and the rocking member. A potentiometer that has a rotating shaft that rotates in accordance with the swing of the moving member and outputs a swing angle signal for driving the actuator, and the swing operation of the swing member is performed by the rotation of the potentiometer. An electric operating device having a transmission means for transmitting the rotational movement of a moving shaft, wherein the potentiometer is such that its main part is located in a region below the outer ends of the supporting shaft, Is arranged so as to be parallel to the support shaft. 2. The swing member includes a pair of gimbals arranged in directions orthogonal to each other, and the support shaft is integrally provided on each of the pair of gimbals. 2. An electric operating device according to claim 1, further comprising a pair of potentiometers for rotating the rotating shafts. 3. The transmission means is integrally provided on each of the support shafts and extends in the direction of the potentiometer, and a vertical plane parallel to a vertical plane including a rotation region of the extension arms. 3. The electric machine according to claim 2, further comprising a rotary arm that is engaged with these extension arms so as to be rotatable in a plane and that is integrally provided on each rotary shaft of the potentiometer. Operation device. 4. A housing for accommodating the gimbal, the support shaft, the extension arm, the rotating arm, and the potentiometer having the rotating shaft and forming an outer shell is provided. The electric operating device according to claim 3. 5. The basic shape of the housing is formed in a cylindrical shape, and the inner diameter thereof is larger than the length of a straight line in a plane connecting the center of the housing and the limit point of the rotation area of the extension arm. The electric operating device according to claim 4, wherein the electric operating device is set. 6. The swing member includes a cam, and a support shaft for rotatably supporting the cam is provided, and the transmission means is provided integrally with the cam and extends in the potentiometer direction. The extension arm is engaged with the extension arm so as to be rotatable in a vertical plane parallel to the vertical plane including the rotation area of the extension arm, and is integrally provided on the rotary shaft of the potentiometer. The electric operating device according to claim 1, further comprising a rotating arm. 7. The length of the extension arm portion from the engagement point of the extension arm and the rotation arm to the center of the support shaft is determined from the engagement point to the center of the rotation axis of the potentiometer. 7. The electric operating device according to claim 3, wherein the length is set longer than the length of the rotating arm portion up to. 8. The electric operating device according to claim 1, wherein the operating member is an operating lever. 9. The electric operation device according to claim 1, further comprising reaction force applying means for applying an operation reaction force to the operation member. 10. The electric operating device according to claim 1, wherein the electric operating device is installed on a console of a mini excavator.