WO2016035914A1 - Electric shaft driving device - Google Patents

Abstract

The present invention relates to a driving device that rotates and linearly moves a shaft. An electric shaft driving device of the present invention is characterized by comprising: a housing; a linearly moving shaft installed to pass through the housing and be capable of linear reciprocal movement in an axial direction, and having screw threads formed on the outer periphery thereof; a clamping block installed inside the housing, and generating a magnetic field through an externally-applied power source; a first clamping plate and a second clamping plate installed to be capable of rotating and moving in an axial direction with respect to the linearly moving shaft (20) on the respective sides of the clamping block within the housing, and formed as magnetic bodies that are moved toward the clamping block and attached by means of the magnetic field generated in the clamping block; a cylindrical connecting member that connects the first clamping plate and the second clamping plate to each other and is inserted in the linearly moving shaft, and has female screw threads formed in the inner periphery thereof that screw couple to the screw threads of the linearly moving shaft; a linear driving unit that generates linear movement of the linearly moving shaft (20) in an axial direction by rotating the first clamping plate; a rotating shaft coaxially connected by a weight supporting member to one end of the linearly moving shaft, and installed to rotate with respect to the linearly moving shaft; and a rotation driving unit for rotating the rotating shaft with respect to the linearly moving shaft.

Description

Electric shaft drive

The present invention relates to a drive device for rotating and linearly moving an axis, and more particularly, in a variety of processing machines such as a molding device or a cutting device, a rotational motion and a linear motion of the axis are separated and generated independently, and a current applied to the clamping device. The present invention relates to an electric shaft drive device capable of precisely controlling gripping force by adjusting.

In general, there is an axis for rotating and linearly moving a tool or a workpiece in a processing machine such as a molding apparatus, a cutting apparatus, and a grinding apparatus. As a shaft drive device for rotating and linearly moving such a shaft, a shaft drive assembly of a rotating hydraulic cylinder structure such as that disclosed in Korean Patent Publication No. 10-0732596 (registered on June 20, 2007) has been mainly used.

The rotary hydraulic cylinder of the registered patent is installed through the hollow shaft motor to install a hydraulic cylinder having a piston for linear movement by the hydraulic, mounting the rotor of the motor on the outer surface of the hydraulic cylinder, the stator on the inner peripheral surface of the hollow shaft motor It will be configured to rotate the hydraulic cylinder.

The rotary hydraulic cylinder is configured to prevent the oil in the cylinder housing from leaking between the cylinder housing and the cylinder body gap by a mechanical seal, but the oil leaks into the mechanical seal and the cylinder body gap due to the centrifugal force. Has

In addition, in the high-speed rotary hydraulic cylinder, the impeller wing for cooling the heat generated inside and outside the cylinder by the high speed rotation of the cylinder is installed to protrude to the outside, but it cools only the surface of the cylinder and efficiently cools the heat generated inside. There is a problem.

In order to solve this problem, the Korean Registered Utility Model Publication No. 20-0243368 (registered on August 7, 2001) installs an impeller between the cylinder housing and the cylinder cover to efficiently cool the heat generated therein. The wing is formed to communicate with the inside of the cylinder housing, to increase the air intake, and to position the air intake position to the head of the cylinder to cool the outside heat of the cylinder housing and the cylinder cover, and at the same time to form an air flow seat inside the product. A rotating hydraulic cylinder for a CNC lathe is disclosed in which heat generated inside can be cooled in a short time to prevent sintering of components in a cylinder. However, such a rotary hydraulic cylinder of the Utility Model Publication does not reduce or eliminate the heat generated by the rotation of the cylinder, it is necessary to additionally configure the impeller blades, there is a problem that the structure is complicated.

As such, the conventional shaft drive device for moving the shaft in a processing machine has to install a separate sealing device or a cooling device by the rotation of the shaft. Therefore, the structure of the system is complicated and inefficient. There is a problem in that the efficiency of the entire system of the shaft drive that moves and rotates the shaft linearly needs to be considered.

In addition, the conventional hydraulic clamping device disclosed in Korean Laid-Open Patent Publication No. 2012-0102862 and the like occupies a lot of space as a hydraulic tank for using hydraulic oil is used, and a plurality of hoses are used between the clamping device in the hydraulic tank. The surrounding area is complicated and there is a problem of contaminating the working environment by the leakage of hydraulic oil, and the maintenance of the hydraulic oil must be replaced periodically. Such a hydraulic clamping device is slow in response and difficult to precisely control the gripping force of the chuck, which may cause deformation of the workpiece depending on the characteristics of the material.

In addition, in the case of clamping device for holding the workpiece, there is a case that the screw jack is used in the linear motion, the screw jack has a low mechanical efficiency due to the high friction force, problems of uncertainty of the control by the backlash and low operating speed.

A device that can obtain a large force by an electric input drive source is an actuator or linear motor using a solenoid type. The force generated in the solenoid type decreases in proportion to the square of the distance, so that the moving distance of the plunger can be increased by a certain degree or more. It can't be used and is limited to very short short-range operations. On the other hand, when a linear motor is used, a large current of several hundred amps is required to obtain a large thrust of about 20 kN. Therefore, the heating and cooling problems in the coil must be considered together with the volume of the motor.

The present invention is to solve the above problems, an object of the present invention is to configure the axis divided into a linear axis and a rotation axis arranged coaxially, and to operate by an independent system by separating each linear movement and rotation movement In addition to this, it is possible to provide an electric shaft drive device capable of realizing a high thrust density per unit volume by independently operating a simple transfer portion and a clamping portion requiring a large chucking force even in linear transfer.

Electric shaft drive device of the present invention for achieving the above object, the housing; A linear moving shaft penetrating the housing so as to be linearly reciprocated in the axial direction and having a thread formed on an outer circumferential surface thereof; A clamping block installed inside the housing and generating a magnetic field by a power applied from the outside; A magnetic material which is installed on both sides of the clamping block in the housing so as to be rotatable and axially movable with respect to the linear moving shaft 20 and is moved and attached to the clamping block by a magnetic field generated in the clamping block; A first clamping plate and a second clamping plate; A cylindrical connecting member fitted to the linear moving shaft while interconnecting the first clamping plate and the second clamping plate and having a female screw thread formed on an inner circumferential surface of the female screw thread coupled to the thread of the linear moving shaft; A linear driving unit which generates an axial linear movement of the linear moving shaft 20 by rotating the first clamping plate; A rotation shaft connected to one end of the linear movement shaft coaxially by a load supporting member and installed to rotate about the linear movement shaft; It characterized in that it comprises a rotary drive unit for rotating the rotary shaft with respect to the linear movement axis.

In the axis drive device of the present invention, the linear drive unit is in charge of linear movement of the linear movement axis and the rotation axis to the set position, and the dual axis drive in which the clamping block is in charge of a separate clamping operation for transmitting the second strong gripping force. As a system, it is possible to provide a large clamping force comparable to the hydraulic pressure by forming a magnetic force in the clamping block electrically without using hydraulic pressure, it is possible to provide a high thrust density per unit volume.

Accordingly, the grip force of the chuck can be easily controlled to minimize the deformation of the workpiece, and there is an effect of implementing the automation of the effective chucking system.

In addition, it is easy to secure space in a machine tool or a workshop, and keep the workshop clean. In addition, the system can be reduced in weight, cost-effective, environmentally-friendly, and highly efficient shaft drive.

1 is an exploded perspective view of an electric shaft drive device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the electric shaft drive device of FIG. 1. FIG.

3 is a perspective view of a linear moving shaft of the electric shaft drive device of FIG.

4 is a perspective view of the clamping block of the electric shaft drive device of FIG.

5A and 5B are longitudinal cross-sectional views of the clamping block of FIG. 4.

6 is a perspective view of a drive gear and a driven gear of the electric shaft drive device of FIG.

7 is a perspective view of the first clamping plate of the electric shaft drive device of FIG.

8 is a perspective view of a second clamping plate of the electric shaft drive device of FIG.

9 is a cross-sectional view of the connecting member of the electric shaft drive device of FIG.

10 is a cross-sectional view of a state in which the first and second clamping plates and the connecting member of FIGS. 7 to 9 are coupled to each other.

11 is a perspective view of the rotating shaft and the load supporting member of the electric shaft drive device of FIG.

12 is a perspective view showing a rotation driving unit of the electric shaft drive device of FIG.

13 is a sectional view showing main parts of an electric shaft driving apparatus according to an exemplary embodiment of the present invention.

14 is an exploded perspective view of the electric shaft drive device of FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the electric shaft drive device according to the present invention.

First, referring to Figures 1 and 2, the electric shaft drive device of the present invention and the housing (10); A linear moving shaft 20 penetrating the housing 10 so as to be linearly reciprocated in the axial direction and having a thread 21 formed on an outer circumferential surface thereof; A clamping block 40 installed inside the housing 10 and generating a magnetic field by a power applied from the outside; Both sides of the clamping block 40 are installed in the housing 10 so as to be rotatable and axially movable with respect to the linear moving shaft 20, and the clamping block is formed by a magnetic field generated in the clamping block 40. A first clamping plate 51 and a second clamping plate 52 which are moved and attached toward 40; A female thread that is fitted to the linear moving shaft 20 while connecting the first clamping plate 51 and the second clamping plate 52 to the thread 21 of the linear moving shaft 20 in a spiral manner. 54 is a cylindrical connecting member 53 formed on the inner peripheral surface; A linear driving unit generating an axial linear movement of the linear moving shaft 20 by rotating the first clamping plate 51; A rotation shaft 30 connected coaxially with a load supporting member 80 at one end of the linear movement shaft 20 and installed to rotate with respect to the linear movement shaft 20; It includes a rotation drive unit for rotating the rotary shaft 30 with respect to the linear moving shaft (20).

A circular through hole 11 through which the linear moving shaft 20 penetrates is formed at the center portion of the housing 10. The housing 10 is fixed to the body of the processing equipment to which the shaft drive device of the present invention is applied.

As shown in FIG. 3, the linear moving shaft 20 is formed in the shape of a circular rod having a predetermined length, and a thread 21 is integrally formed at the middle portion. The spline protrusion 22 is formed on the outer surface of the linear moving shaft 20 along the axial direction, and the spline protrusion 22 is inserted into the through hole 11 in the center of the housing 10 to guide the spline 22. Groove 12 is formed. Thus, the linear axis of movement 20 does not rotate relative to the housing 10 but only moves in the axial direction.

4 to 5B, the clamping block 40 is wound around the stator iron core 41 fixed to the inside of the housing 10 and the stator iron core 41 to generate a magnetic field by a power applied from the outside. It is comprised including the coil 42 which generate | occur | produces. A plurality of slots 43 in which the coils 42 are wound are formed on both side surfaces of the clamping block 40, and power is selectively applied to the coils 42 wound on both sides of the clamping block 40, thereby clamping. Magnetic fields are selectively generated at both sides of the block 40. The magnetic field generated on either side of the clamping block 40 does not affect the other side of the opposite side.

The clamping block 40 is preferably impregnated and coated with a synthetic resin such as an epoxy resin to dissipate heat generated from the coil 42.

The direction of the current flowing in the coils 42 wound on the slots 43 on both sides of the clamping block 40 may be in the same direction as shown in FIG. 5A or alternately as shown in FIG. 5B. It may be arranged.

FIG. 6 shows a driven gear 63 and a drive gear 62 constituting a linear drive unit for rotating the first clamping plate 51. The driven gear 63 is in the form of a ring to form the first gear. It is fixedly coupled to the outer peripheral surface of the clamping plate (51). The drive gear 62 is connected to the shaft of the first electric motor 61 constituting the linear drive unit to transfer the rotation of the first electric motor 61 to the driven gear 63. The driven gear 63 has a larger diameter than the drive gear 62 and thus has more teeth than the drive gear 62. Therefore, the power of the first electric motor 61 is decelerated to the first clamping plate 51 by the gear ratio of the drive gear 62 and the driven gear 63 to be transmitted at a large torque. The drive gear 62 and the driven gear 63 may be configured by applying a spur gear, but may be configured by applying any gear, such as a helical gear and a worm gear.

As shown in FIG. 7, the first clamping plate 51 is a disk-shaped magnetic material, and a through hole 51a into which the linear moving shaft 20 is fitted is formed at a central portion thereof, and the driven gear 63 is formed at an outer portion thereof. ) Is coupled to the gear coupling portion 51b is formed to be stepped. In addition, a coupling groove 51c to which one end of the connection member 53 is inserted and fixed to an outer portion of the through hole 51a is concave.

As shown in FIG. 8, the second clamping plate 52 is a magnetic body having a disk shape similar to that of the first clamping plate 51, and the through hole 52a to which the connection member 53 is fitted is coupled to a central portion thereof. Is formed. In addition, a metal ball 92 (see FIG. 2) and a leaf spring 91 (refer to FIG. 2) elastically supporting the ball 92 are installed on the outer circumferential surface of the second clamping plate 52. A V'-shaped ball plunger groove 52b is formed.

9 and 10, the connecting member 53 is formed in the shape of a hollow cylindrical tube, fitted to the linear moving shaft 20, and the through hole 52a of the second clamping plate 52. It is inserted through the through hole 44 of the clamping block 40 to fix the first clamping plate 51 and the second clamping plate 52 to each other. In addition, a female thread 54 is formed on the inner circumferential surface of the connecting member 53 and is helically coupled to the thread 21 of the linear moving shaft 20. Therefore, when the connecting member 53 is rotated, the linear moving shaft 20 in the axial direction by the action between the female thread 54 of the connecting member 53 and the screw thread 21 of the linear moving shaft 20. Will move.

As shown in FIG. 11, one end of the rotary shaft 30 is formed with a bearing mount groove 31 into which one end of the linear moving shaft 20 is rotatably inserted. The shaft 30 moves in the axial direction together with the linear movement shaft 20 when the linear movement shaft 20 moves in the axial direction inside the bearing mount groove 31, but the rotation shaft 30 rotates by the rotation driving unit. At this time, the linear movement shaft 20 is provided with a load supporting member 80 for supporting only the rotation axis 30 to rotate freely with respect to the linear movement shaft 20 in the stopped state. Here, the load supporting member 80 may be composed of a combination of a plurality of bearings 80 that can simultaneously support the thrust of the linear moving shaft 20 and the rotational force of the rotary shaft 30, for example, the load support As the member 80, multiple angular contact bearings, each of which the inner ring and the outer ring are coupled to the outer circumferential surface of the linear moving shaft 20 and the inner circumferential surface of the bearing mount groove 31, may be applied.

Although not shown in the drawings, the rotary shaft 30 may be connected to the chuck (chuck) for holding the tool or the workpiece in the processing equipment. In this embodiment, it will be described on the assumption that the chuck holding the workpiece is coupled to one end of the rotating shaft 30.

The rotary drive unit for rotating the rotary shaft 30 is wound on the second electric motor 71, the shaft of the second electric motor 71 and the rotary shaft 30, as shown in FIG. It is configured to include a power transmission belt 72 for transmitting the power of the motor 71 to the rotating shaft (30).

Hereinafter, the operation of the electric shaft drive device of the present invention configured as described above will be described with reference to FIG.

First, when the linear movement shaft 20 and the rotation shaft 30 are to be moved, when power is applied to the first electric motor 61 of the linear drive unit, the rotational force of the first electric motor 61 is driven by the drive gear 62. Is transmitted to the driven gear (63).

At this time, the power of the first electric motor 61 is decelerated by the gear ratio of the drive gear 62 and the driven gear 63 as described above, and is transmitted to the first clamping plate 51 at a large torque. Since the first clamping plate 51 is fixedly coupled to the second clamping plate 52 by the connecting member 53, the first clamping plate 51-the connecting member 53-the second clamping plate 52 Will rotate together.

At this time, the female screw thread 54 of the connecting member 53 and the screw thread 21 of the linear moving shaft 20 are spirally coupled, and the spline protrusion 22 and the housing 10 of the linear moving shaft 20 are connected. Since the rotation of the linear moving shaft 20 is limited by the groove 12 of the linear movement shaft 20 is moved in the axial direction by the rotation of the connecting member (53). Since one end of the linear moving shaft 20 is connected to the rotary shaft 30, the rotary shaft 30 moves linearly in the axial direction together with the linear moving shaft 20.

When the linear movement to the set end position of the linear movement shaft 20 and the rotary shaft 30 is stopped the operation of the first electric motor (61). In order to hold the workpiece by the chuck (not shown) in this end position, the linear movement shaft 20 and the rotation shaft 30 must be moved by a predetermined distance in the axial direction with a large force comparable to the hydraulic pressure. To this end, when a current is applied to the coil 42 wound on one side of the clamping block 40 (for example, the left side in the drawing of FIG. 2), a magnetic field is generated on the left side of the clamping block 40. The one clamping plate 51 is stuck to the left side of the clamping block 40 by the magnetic force. Accordingly, the linear movement shaft 20 and the rotation shaft 30 are moved to the right in the drawing by a predetermined distance. Subsequently, when a current is applied to the coil 42 wound on the other side (right side in the drawing) of the clamping block 40 and a magnetic field is generated on the right side of the clamping block 40, the second clamping plate 52 Is stuck to the right side of the clamping block 40 by the magnetic force, and thus the linear movement shaft 20 and the rotation shaft 30 are moved to the left in the drawing by a predetermined distance.

After the linear movement shaft 20 and the rotation shaft 30 are linearly moved through the same process as described above, and the chuck (not shown) grips the workpiece, it is necessary to rotate the rotation shaft 30 to process the workpiece. have. To this end, when power is applied to the second electric motor 71 of the rotary drive unit, the rotational force of the second electric motor 71 is transmitted to the rotary shaft 30 through the power transmission belt 72, and the rotary shaft 30 is The load supporting member 80 performs the machining of the workpiece while rotating at a high speed with respect to the linear moving shaft 20.

On the other hand, the ball 92 and the leaf spring 91 has a large chucking force is applied to the linear movement shaft 20 by the suction force acting between the first and second clamping plates (51, 52) and the clamping block (40) When delivered, it serves to maintain a constant gap between the first and second clamping plates 51 and 52 and the clamping block 40. That is, the leaf spring 91 presses the ball 92 with an appropriate force, and the pressed ball 92 is in contact with the surface of the ball plunger groove 52b of the second clamping plate 52 to form the second clamping plate. The rotation of (52) makes a frictional movement. The one or more balls 92 pressurized by the appropriate force by the leaf spring 91 maintains a constant gap with the clamping block 40 when the second clamping plate 52 rotates and is no longer chucked to the workpiece. When there is no movement of the linear movement shaft 20 serves to store the additional rotational force of the second clamping plate (52). This is because the second clamping plate 52 moves in the opposite direction of the linear moving shaft 20 and the ball 92 restrained on the housing 10 by the displacement of the rotational force of the second clamping plate 52 is plate spring 91. By pushing), the force is accumulated by the elastic energy of the leaf spring 91 to perform an additional locking function in addition to the self-rock function of the thread 21 and the female thread 54.

As described above, in the shaft drive device of the present invention, the linear driving unit is in charge of linearly moving the linear moving shaft 20 and the rotating shaft 30 to a predetermined position, and clamps a separate clamping operation for transmitting the second strong gripping force. The block 40 is a dual axis drive system.

In addition, the rotation shaft 30 may be independently rotated with respect to the linear movement shaft 20 by the load supporting member (80).

On the other hand, the above-described electric shaft drive device provides a large clamping force through the clamping block 40, but when applied to a device that does not require a large clamping force, the clamping block 40 is omitted and the first electric motor 61 The clamping force may be secured by using the rated torque of) or the maximum torque if necessary.

In addition, when applied to a device that does not require the rotation of the workpiece, it is also possible to omit the rotary shaft 30 and the rotary drive unit and use only linear movement of the linear moving shaft 20.

The above-described electric shaft drive device constitutes one clamping block 40, but as shown in FIGS. 13 and 14, a plurality of clamping blocks 40 (two in this embodiment) are arranged at regular intervals. In addition, the clamping block 40 and the clamping block 40 may further increase the clamping force by interposing an intermediate clamping plate 55 fixedly coupled to the outer surface of the connecting member 53.

Although the present invention has been described in detail with reference to the embodiments, those skilled in the art to which the present invention pertains will be capable of various substitutions, additions, and modifications without departing from the technical spirit described above. It is to be understood that such modified embodiments are also within the protection scope of the present invention as defined by the appended claims.

The present invention can be applied to processing machines such as molding apparatus, cutting apparatus, grinding apparatus, and the like.

Claims (17)

A housing 10; A linear movement shaft 20 installed through the housing 10 to linearly reciprocate in the axial direction and having a thread 21 formed on an outer circumferential surface thereof; A clamping block 40 installed inside the housing 10 and generating a magnetic field by a power applied from the outside; The clamping block 40 is installed on both sides of the clamping block 40 in the housing 10 so as to be axially movable with respect to the linear moving shaft 20, by a magnetic field generated in the clamping block 40. A first clamping plate 51 and a second clamping plate 52 made of a magnetic material attached to and moved to the side; A female thread that is fitted to the linear moving shaft 20 while connecting the first clamping plate 51 and the second clamping plate 52 to the thread 21 of the linear moving shaft 20 in a spiral manner. 54 is a cylindrical connecting member 53 formed on the inner peripheral surface; And a linear driving unit for generating an axial linear movement of the linear moving shaft (20) by rotating the first clamping plate (51). The rotary shaft 30 of claim 1, wherein the rotary shaft 30 is coaxially connected to one end of the linear movable shaft 20 by a load supporting member 80 and installed to rotate about the linear movable shaft 20; Electric shaft drive device characterized in that it further comprises a rotary drive unit for rotating the rotary shaft 30 with respect to the linear moving shaft (20). The coil of claim 1, wherein the clamping block 40 is wound around a stator iron core 41 fixed to the inside of the housing 10 and wound around the stator iron core 41 to generate a magnetic field by a power applied from the outside. Electrical shaft drive device characterized in that it comprises a (42). According to claim 3, A plurality of slots 43 are formed on each side of the clamping block 40, the coil 42 is wound, the coil 42 wound on both sides of the clamping block 40 is optional Power is applied to the electric shaft drive device, characterized in that the magnetic field is generated selectively on both sides of the clamping block (40). 5. The electric shaft drive device according to claim 4, wherein the direction in which the coils (42) wound on the slots (43) of each side of the clamping block (40) flow in the same direction is the same. 5. The electric shaft drive device according to claim 4, wherein the directions of the coils (42) wound on the slots (43) of each side of the clamping block (40) are alternately arranged differently. 5. The electric shaft drive device according to claim 3 or 4, wherein the clamping block (40) is impregnated with a synthetic resin and coated to dissipate heat generated from the coil (42). According to claim 1, wherein the linear drive unit is connected to the first electric motor 61 and the axis of the first electric motor 61 directly or indirectly rotated by the first electric motor (61). And a driven gear (63) fixedly coupled to the outer surface of the first clamping plate (51) and engaged with the drive gear (62) to rotate. 9. The electric shaft drive device according to claim 8, wherein the driven gear (63) has more teeth than the drive gear (62). According to claim 2, The rotary drive unit is wound around the axis of the second electric motor 71, the second electric motor 71 and the rotary shaft 30, the power of the second electric motor 71 is rotated ( Electric shaft drive device characterized in that it comprises a power transmission belt 72 for transmitting to. According to claim 2, The load supporting member 80 is installed inside the bearing mount groove 31 formed in one end of the rotating shaft 30, the inner ring is coupled to the outer peripheral surface of the linear moving shaft 20 Electric shaft drive device characterized in that the outer ring is coupled to the inner surface of the bearing mount groove 31, a combination of a plurality of bearings that simultaneously support the axial movement of the linear movement shaft 20 and the rotational force of the rotary shaft 30 . The plate of claim 1, wherein the plate is installed between an outer circumferential surface of the second clamping plate 52 and an inner surface of the housing 10 to elastically press the outer circumferential surface of the second clamping plate 52 against the housing 10. An electric shaft drive device further comprises a spring (91) and a ball (92). According to claim 1, wherein the first clamping plate 51 has a through hole (51a) is formed in the center of the linear movement shaft 20 is fitted, the outer gear is engaged with the gear 63 is coupled to the gear coupling An electric shaft, characterized in that the portion 51b is formed in a stepped shape, and has a disk-shaped concave coupling groove 51c in which one end portion of the connection member 53 is inserted and fixed to an outer portion of the through hole 51a. Drive system. The electric shaft drive device according to claim 1, wherein the second clamping plate (52) is formed in a disk shape in which a through hole (52a) is formed in which a center portion of the connection member (53) is fitted. 2. The electric shaft drive device according to claim 1, wherein a plurality of clamping blocks (40) are disposed in the housing (10) at regular intervals. The spline groove of claim 1, wherein the spline protrusion (22) is formed to protrude along the axial direction on the outer surface of the linear moving shaft (20), and the spline protrusion (22) is inserted into the housing (10). Electric shaft drive device, characterized in that formed (12). A housing 10; A linear movement shaft 20 installed through the housing 10 to linearly reciprocate in the axial direction and having a thread 21 formed on an outer circumferential surface thereof; A clamping block 40 installed inside the housing 10 and generating a magnetic field by a power applied from the outside; The housing 10 is installed on both sides of the clamping block 40 so as to be axially movable with respect to the linear movement shaft 20, and the linear movement shaft is formed by a magnetic field generated in the clamping block 40. A first clamping plate 51 and a second clamping plate 52 made of magnetic material axially moving with respect to 20); A female thread that is fitted to the linear moving shaft 20 while connecting the first clamping plate 51 and the second clamping plate 52 to the thread 21 of the linear moving shaft 20 in a spiral manner. Electric shaft drive device characterized in that it comprises a cylindrical connecting member 53 is formed on the inner peripheral surface (54).

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