JPH08185769A - Operation unit for switchgear - Google Patents

Abstract

PURPOSE: To provide an operation unit for a switchgear not requiring to use an expensive square thread at the screw section of a screw feed mechanism and capable of miniaturizing the mechanism. CONSTITUTION: A screw rod 31 integrally provided with a screw forming portion 31A and a guide shaft section 31B on the same shaft is used, and a nut 32 is meshed with the screw forming portion 31A of the screw rod 31. The guide shaft section 31B is slidably inserted into a hole provided on a slider 33, and the nut 32 and the slider 33 are connected by a connection section 34. A drive roller 38 fitted to the slider 33 is coupled with the notch groove 43e of a drive lever 43 fitted to a main spindle 42. The slider 33 is moved together with the nut 32 by the rotation of the screw rod 31, and the drive lever 43 is rotated through the drive roller 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch operating device for applying an operating force to an operating shaft of a switch such as a circuit breaker or a disconnecting switch.

[0002]

2. Description of the Related Art As an operating device for operating a switch, a feed screw mechanism, a slider linearly driven by the feed screw mechanism, a drive roller rotatably supported by the slider, and a drive roller are provided. There is one in which a power transmission mechanism having a drive lever coupled to a slider and rotated with linear displacement of the slider is provided as a part of an operation mechanism that applies an operation force to an operation shaft of a switch.

FIGS. 3 and 4 show an example of the construction of the essential parts of this type of operating device. In FIG. 3, 1 and 2 are shaft support plates arranged in parallel with each other, and 3 is a shaft support plate 1. And 2 are screw rods having one end 3a and the other end 3b supported by bearings 4 and 5, respectively, and the screw rod 3 has one end 3a connected to an output shaft of a rotary drive source or an operation handle (not shown) for rotation. Driven. A nut 6 is provided on the threaded portion 3A of the threaded rod 3.
Are engaged with each other, and the screw rod 3 and the nut 6 constitute a feed screw mechanism. In this example, the nut 6 also serves as a slider, and cylindrical roller support shafts 7 and 8 are provided on opposite side surfaces of the nut 6, and drive rollers 9 and 10 are provided on the roller support shafts 7 and 8, respectively. It is rotatably supported. Further, a guide roller 11 is rotatably supported by a roller support shaft 7, and the guide roller 11 is formed by a guide groove 1 formed in a guide plate 12 arranged on the side of the screw rod 3.
3 is fitted. The guide groove 13 is provided so as to extend in the axial direction of the screw rod 3, and when the nut 6 is linearly driven by the rotation of the screw rod 3, the guide roller 11 rolls in the guide groove 13 to move the nut 6. It is designed to guide in the axial direction of the screw rod.

In the vicinity of the screw rod 3, there is provided a main shaft 14 which is arranged so as to extend in a direction orthogonal to the screw rod 3 and is rotatably supported by a frame (not shown) via a bearing. A lever 16 is attached.
The drive lever 16 is a pair of levers 1 extending parallel to each other.
6a and 16b and a boss portion 16c provided so as to connect the rear end portions of these levers are integrally formed.
6c is fitted on the main shaft 14. Levers 16a, 16
In b, a notch groove 16d opened at each tip,
16e are formed, and these cutout grooves 16d and 16e are formed.
The drive rollers 9 and 10 are fitted therein.

In this operating device, when the screw rod 3 is rotated, the nut 6 moves in the axial direction of the screw rod 3 while being guided by the fitting of the guide roller 11 and the guide groove 13.
This linear displacement of the screw rod is transmitted to the drive lever 16 via the drive rollers 9 and 10, and the drive lever 16 rotates. As a result, the main shaft 14 rotates, and an operating force is applied to a switch (not shown).

The main shaft 14 itself may form an output shaft and be directly connected to the operating shaft of the switch, or may be used as a shaft forming a part of a mechanism forming the operating device. . For example, in an operating device provided with an operating spring that is energized by an electric motor, and a mechanism that causes the opening operation of the switch to be performed at once by the biasing force of the operating spring, the main shaft 14 energizes the operating spring. In some cases, the input axis of is configured.

FIG. 5 shows a main part of another operation device which has been conventionally used. In this operation device, both ends are bearings 17,
A nut 19 is meshed with a threaded rod 18 supported via 17. Further, guide rods 20 extending parallel to the screw rods 18 are provided, and both ends of the guide rods 20 are provided on the support base 2.
A slider 22, which is supported by 1, 21 and slidably guided by a guide rod 20, is connected to the nut 19. The drive roller 23 is attached to the slider 22, and the drive roller 23 is fitted in the cutout groove of the drive lever 25 attached to the main shaft 24. In this operating device, the nut 19 is linearly driven by the rotation of the screw rod 18, and the slider 22 is moved together with the nut 19. Since the linear displacement of the slider is transmitted to the drive lever 25 via the drive roller 23, the drive lever 25 rotates and the main shaft 24 rotates.

[0008]

In the conventional operating device shown in FIGS. 3 and 4, the force F generated in the nut 6 is applied to the main shaft 14 via the drive rollers 9 and 10 and the drive lever 16.
At the time of conversion into the driving torque T of 1, the reaction force from the main shaft 14 acts not only in the axial direction of the screw rod 3 but also in the direction perpendicular to the axial line. Therefore, if the threaded portion of the threaded rod 3 is a trapezoidal thread, the thread of the threaded rod 3 and the thread groove of the nut 6 bite into each other due to the wedge effect, and there is a possibility that the thread is inoperable. In order to avoid this, in the operating device using the mechanism of the type shown in FIGS. 3 and 4, it is necessary to configure the screw portion of the screw rod 3 with an expensive square screw, which inevitably increases the cost. It was Depending on the application of the operating device, in order to improve efficiency, a ball screw with a ball interposed between the threaded part of the threaded rod and the threaded part of the nut, or a thread-like body made of resin with low frictional resistance instead of the ball A string screw (product name) in which the thread is interposed between the threaded portion of the threaded rod and the threaded portion of the nut by using (string)
Although it may be desirable to use a feed screw mechanism for the feed screw mechanism, the operating device shown in FIGS. 3 and 4 could not meet such a demand.

In the operating device using the mechanism shown in FIG. 5, since the slider 22 can receive the reaction force acting in the direction perpendicular to the axis, the reaction force in the direction perpendicular to the axis acts on the screw rod 18. Can be prevented. Therefore,
An inexpensive trapezoidal screw or a highly efficient ball screw can be used for the screw portion of the screw rod 18. However, in this operating device, the slider 22 and the guide shaft 20 are
In order to prevent a twist from occurring between the slider 22 and the slider 22, it is necessary to make the slider 22 long in the axial direction, and accordingly the length of the guide rod 20 needs to be lengthened. There was a problem of becoming.

An object of the present invention is to make it possible to construct a screw feed mechanism using screws other than square screws such as inexpensive trapezoidal screws and highly efficient ball screws without increasing the size of the mechanism. It is to provide an operating device for a switch.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a feed screw mechanism, a slider linearly driven by the feed screw mechanism,
An operating shaft of a switch is provided with a power transmission mechanism having a drive roller rotatably supported by the slider and a drive lever coupled to the slider via the drive roller and rotated with linear displacement of the slider. The present invention relates to a switch operating device provided in a part of an operating mechanism for applying an operating force to the switch.

In the present invention, the feed screw mechanism is
It is configured by a threaded rod integrally having a threaded portion formed with a male screw and a cylindrical guide shaft portion coaxially, and a nut meshed with the threaded portion of the threaded rod. The slider is arranged at a distance from the nut and is slidably fitted to the guide shaft portion of the screw rod. The nut and the slider are connected to each other via a connecting portion, and the slider is moved together with the nut in the axial direction of the threaded rod.

[0013]

With the above-described structure, the slider receives all the reaction force acting from the drive lever side to the screw rod side in the direction perpendicular to the axis of the screw rod. It suffices to receive only the reaction force acting in the axial direction of. Therefore, an inexpensive trapezoidal screw, an efficient ball screw, a string screw (trade name), or the like can be used as the nut and the screw forming portion.

Further, as described above, the screw rod integrally including the screw forming portion and the guide shaft portion is used, and the slider and the nut are arranged on the guide shaft portion and the screw forming portion, respectively, and between the nut and the slider. With the structure in which the slider is connected by the connecting portion, it is possible to prevent the slider from tilting with respect to the axial direction of the screw rod when it moves, so that the slider and the guide shaft portion can be connected to each other without increasing the axial dimension of the slider. It is possible to prevent twisting between the two. Therefore, the mechanism can be made compact as compared with the case where the slider and the nut are arranged on different shafts, and it is possible to prevent the mechanism from becoming large.

[0015]

1 and 2 show an essential part of an embodiment of the present invention. FIG. 1 is a front view of the essential part, and FIG. 2 is a sectional view taken along line AA of FIG.

In FIGS. 1 and 2, reference numeral 31 denotes a threaded rod, which has a threaded portion 31A on which a male screw is formed and a cylindrical guide shaft portion 31B coaxially and integrally.
Both ends of the screw rod 31 are rotatably supported by shaft support plates (not shown) via bearings. The nut 32 is engaged with the thread forming portion 31A of the screw rod 31, and the guide shaft portion 3
A slider 33 is slidably fitted to 1B.
The slider 33 is composed of a rectangular parallelepiped block 33a having a hole penetrating the guide shaft portion 31B, and a thrust bearing 33b attached to the inner circumference of the hole penetrating the guide shaft portion 31B of the block. It is in sliding contact with the guide shaft portion 31B.

The nut 32 and the slider 33 are formed by the screw rod 3
1 are symmetrically arranged on both sides of the screw rod 1 and are connected to each other by a pair of connecting portions 34, 34 extending parallel to each other in the axial direction of the screw rod to be integrated, and the nut 3 is rotated by rotating the screw rod 31.
When 2 is displaced in the axial direction of the screw rod 31, the slider 33 moves integrally with the nut 32 in the axial direction.

On both side surfaces of the slider 33, connecting portions 34,
Cylindrical roller support shafts 35 and 36 are provided so as to project and extend in a direction perpendicular to the facing direction of 34. These roller support shafts 35 and 36 are provided so that their central axes coincide with each other, and drive rollers 37 and 38 are attached to the roller support shafts 35 and 36, respectively, and a guide roller 39 is further attached to the roller support shaft 35. Is attached.

A guide plate 40 having a size extending at least over the moving range of the slider 33 is arranged on the side of the screw rod 31, and a guide groove (long hole) provided in the guide plate 40.
A guide roller 39 is fitted in 41. The guide groove 41 is provided in parallel with the axis of the screw rod 31 so as to extend over the movement range of the slider 33, and the guide roller 39 rolls in the guide groove 41 so that the slider 33 moves in the axial direction of the screw rod. It is supposed to be guided.

On the side of the guide shaft portion 31B of the threaded rod 31, a main shaft 42 extending in a direction perpendicular to the axis of the threaded rod 31 is provided.
Is provided, and the drive lever 43 is attached to the main shaft 42. As shown in FIG. 2, the drive lever 43 is
A pair of levers 43a and 43b extending parallel to each other and a boss portion 43c provided so as to connect the rear end portions of these levers are integrally provided, and the boss portion 43c is fitted to the main shaft 42. . The levers 43a and 43b are provided with notch grooves 43d and 43e which are opened at their respective tip ends.
The drive roller 3 is placed in the cutout grooves 43d and 43e.
7, 38 are fitted.

In the above embodiment, the pair of one connecting portions 34, 34 connecting the nut 32 and the slider 33 are applied from the nut 32 to the slider 33 when the load applied to the main shaft 42 is within the rated range. Due to the force in the direction parallel to the axis of the threaded rod and the reaction force acting from the main shaft 42 via the drive lever 43 and the slider 33 in the direction parallel to the axis of the threaded rod, the connecting portions 34, 34 are substantially affected. It is formed to have sufficient strength so as not to be deformed.

The main shaft 42 is connected to, for example, an operation shaft of the switch (a shaft that gives a force for moving the movable contact) directly or via a lever, and the switch is opened / closed by reciprocating rotation of the main shaft 42. To be done.

In the above embodiment, when the screw rod 31 is rotated in one direction, the nut 32 meshed with the thread forming portion 31A of the screw rod moves to one side in the axial direction of the screw rod 31. At this time, the slider 33 moves the nut 3
2 moves in the axial direction of the screw rod together with 2, and drives roller 37
The drive lever 43 is rotated in one direction via the and 38. When rotated in the opposite direction of the screw rod 31, the nut 32
Moves linearly in the other direction together with the slider 33, and rotates the drive lever 43 in the other direction.

In the above embodiment, the force F generated in the nut 32 by the rotation of the screw rod 31 is applied to the main shaft 42 via the slider 33, the drive rollers 37, 38 and the drive lever 43.
When converting to the driving torque T of No. 2, all the reaction force acting from the main shaft 42 through the driving lever 43 in the direction perpendicular to the axis of the screw rod is received by the slider 33, and the nut 32
Will only receive the reaction force acting in the axial direction of the screw rod. Therefore, the screw of the thread forming portion 31A of the screw rod 31 does not need to be a square screw, and there is no problem even if it is an inexpensive trapezoidal screw. Further, the screw forming portion 31A and the nut 3
It is also possible to use a highly efficient ball screw as the second screw portion and to have a structure in which the screw forming portion 31A and the screw portion of the nut 32 are engaged with each other through a large number of balls.

A commercially available string screw (trade name) can be used as the screw and the nut 32 of the screw forming portion 31A. The string screw is obtained by replacing the ball of the ball screw with a string (filament) made of resin having low friction resistance and high durability.
As shown in FIG. 5, a structure in which a thread groove 32a of the nut 32 and a string 50 extending along the thread groove 31a of the thread forming portion 31A are interposed between the thread portion of the nut 32 and the thread forming portion 31A of the screw rod 31. (The structure in which the thread forming portion 31A of the threaded rod and the thread portion of the nut 32 are meshed with each other through a thread-like body having a small friction coefficient).

The string screw is characterized by high efficiency and smooth operation, and can be used for a long time without lubrication (without grease up). Therefore, if a string screw is used as the screw and the nut 32 of the screw forming portion 31A, the maintenance of the feed screw mechanism can be made almost unnecessary, and the maintenance of the switch operating device can be facilitated.

As in the above embodiment, when the nut 32 and the slider 33 are provided at a predetermined interval and are connected by the connecting portions 34, 34, the slider 33 is formed.
When the slider is linearly moved, the slider can be restrained by the connecting portion to keep its posture constant, and the slider 33 can be prevented from tilting with respect to the axial direction of the screw rod during the movement. It is possible to prevent twisting between the slider 33 and the guide shaft portion 31B without particularly increasing the axial dimension of the slider 33. Therefore, since it is not necessary to lengthen the guide shaft portion 31B more than necessary,
It is possible to prevent the mechanism from becoming large.

INDUSTRIAL APPLICABILITY The present invention can be widely applied to switch operating devices provided with a screw feed mechanism in at least a part of the switch operating mechanism. In the above embodiment, the main shaft 42 is connected to the operation shaft of the switch as the output shaft of the operating device, but the present invention is limited to the case where the main shaft 43 constitutes the output shaft of the operating device. Instead, the present invention can be applied to a case where the main shaft is used as a part of the shaft in the switch operating mechanism.

The preferred embodiments of the present invention have been described above. The main aspects of the invention disclosed in this specification are as follows.

(1) A feed screw mechanism, a slider linearly driven by the feed screw mechanism, a drive roller rotatably supported by the slider, and a slider connected to the slider via the drive roller. In a switch operating device including a power transmission mechanism having a drive lever that is rotated in accordance with linear displacement, as a part of an operating mechanism that applies an operating force to an operating shaft of the switch, the feed screw mechanism is a male screw. A threaded rod having a threaded portion formed with a screw and a cylindrical guide shaft portion coaxially integrally, and having both ends rotatably supported by bearings, and a threaded portion of the threaded rod meshed with each other. A nut, the slider is arranged at a distance from the nut, and is slidably fitted to a guide shaft portion of the screw rod, and a screw rod is provided between the nut and the slider. Both They are arranged symmetrically with the switch operating unit, characterized in that it is connected by a connecting portion of a pair extending parallel to said threaded rod.

(2) A feed screw mechanism, a slider linearly driven by the feed screw mechanism, and a drive lever attached to a main shaft extending in a direction perpendicular to the moving direction of the slider and having a notch groove at its tip. And a drive roller rotatably supported by the slider and fitted in the cutout groove of the drive lever, as a part of the operating mechanism for applying an operating force to the operating shaft of the switch. In the switch operating device, the feed screw mechanism includes a threaded rod integrally having a threaded portion on which a male screw is formed and a cylindrical guide shaft portion coaxially, and a threaded portion on the threaded portion of the threaded rod. And a slider, the slider is disposed at a distance from the nut, and is slidably fitted to the guide shaft portion of the screw rod. Are An operating device for a switch, which is connected by a connecting portion.

(3) A feed screw mechanism, a slider linearly driven by the feed screw mechanism, and a drive lever attached to a main shaft extending in a direction perpendicular to the moving direction of the slider and having a notch groove at its tip. And a drive roller rotatably supported by the slider and fitted in the cutout groove of the drive lever, as a part of the operating mechanism for applying an operating force to the operating shaft of the switch. In the switch operating device, the feed screw mechanism has a screw forming portion on which a male screw is formed and a cylindrical guide shaft portion which are coaxially integrated with each other and whose both ends are rotatably supported by bearings. A rod and a nut meshing with a thread forming portion of the screw rod, and the slider is slidably arranged on the guide shaft portion of the screw rod with a distance from the nut. A switch operating device characterized in that the nut and the slider are fitted to each other and are symmetrically arranged on both sides of the screw rod, and are connected by a pair of connecting portions extending parallel to the screw rod.

(4) The threaded portion of the threaded portion of the threaded rod and the threaded portion of the nut are engaged with each other through a large number of balls, according to any one of the above items (1) to (3). Switch operation device.

(5) The threaded portion of the thread forming portion of the threaded rod and the threaded portion of the nut are engaged with each other through a thread-like body made of resin having a small friction coefficient. The switch operating device described in any one of the above.

[0035]

As described above, according to the present invention, the threaded rod integrally including the thread forming portion and the guide shaft portion is used,
Since the slider is slidably fitted to the guide shaft part, the nut is engaged with the thread forming part, and the nut and slider are connected by the connecting part,
Of the reaction forces acting from the drive lever side to the screw rod side, the slider can receive all the reaction force in the direction perpendicular to the axis of the screw rod. Therefore, since the nut need only receive the reaction force acting in the axial direction of the threaded rod, it is not always necessary to use a square screw as the screw of the nut and the screw forming portion, and an inexpensive trapezoidal screw is used, or the efficiency is low. You can use a good ball screw.

According to the present invention, it is possible to prevent twisting between the slider and the guide shaft portion without increasing the axial dimension of the slider. The mechanism can be made compact as compared with the case of arranging the switch and the mechanism of the switch operating device can be prevented from becoming large.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross-section of the structure of a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a configuration of a main part of a conventional switch operating device.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a front view schematically showing a configuration of a main part of another conventional switch operating device.

FIG. 6 is a cross-sectional view showing a structure of a main part of a string screw that can be used in the present invention.

[Explanation of symbols]

 31 screw rod 31A screw forming part 31B guide shaft part 32 nut 33 slider 34 connecting part 35, 36 roller support shaft 37, 38 drive roller 39 guide roller 42 main shaft 43 drive lever 43d, 43e notch groove

Claims (1)

[Claims] 1. A feed screw mechanism, a slider linearly driven by the feed screw mechanism, a drive roller rotatably supported by the slider, and a straight line of the slider coupled to the slider via the drive roller. A switch operating device comprising a power transmission mechanism having a drive lever that is rotated according to displacement, as a part of an operating mechanism that applies an operating force to an operating shaft of a switch, wherein the feed screw mechanism is a male screw. A threaded portion having a threaded portion formed with and a cylindrical guide shaft portion integrally on the same axis, and a nut meshed with the threaded portion of the threaded rod, the slider, A switch for a switch, characterized in that the nut and the slider are slidably fitted in a guide shaft portion of the screw rod, and that the nut and the slider are connected by a connecting portion. Operation device.