JPH08196052A - Rotary driver - Google Patents

Abstract

PURPOSE: To prevent misalignment of axis and abnormal vibration of the rotary shaft and to enhance accuracy in the positioning and rotation while reducing the weight by integrating the motor shaft and the torque transmission member into a long rotor being supported rotatably at the opposite end thereof. CONSTITUTION: The rotary driver 20 comprises a long rotor 17 penetrating a rotor 14 and secured concentrically thereto, and members 15, 16 for supporting the long rotor 17 rotatably at the opposite ends thereof. When power is turned on, a current flows through the stator winding 12 of the stator 13 to generate a field and the rotor 14 rotates together with the long rotor 17 bonded thereto through an adhesive 19 at same angular speed. Consequently, a toothed pulley 18b for timing belt fixed to a pulley shaft 18a formed integrally with the long rotor 17 is rotated to transmit the torque. Since the axis can be aligned strictly, fluctuation in the rotation due to vibration or run out can be prevented and highly accurate positioning and operation control can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive device,
In particular, the present invention relates to a rotary drive device that is rotationally driven by an electromagnetic force between a rotor and a stator.

[0002]

2. Description of the Related Art FIG. 9 shows a first conventional example. The rotary drive device 70 according to the first conventional example includes a DC motor 60 provided on a fixed base 61 and a motor shaft 67 of the DC motor 60.
A pulley shaft 68a having a key groove 68d formed therein, a timing belt toothed pulley 68b concentrically fixed to the pulley shaft 68a by inserting a key 68c into the key groove 68d, and the motor shaft 67. A coupling 69 that couples the connecting end 67a and the end 68e of the pulley shaft 68a to transmit the torque of the DC motor 60, and the other end of the pulley shaft 68a is rotatably supported by the fixed base 61. And a support plate 66. FIG. 10 is a perspective view of the DC motor 60 with a part thereof cut away.

As shown in FIGS. 9 and 10, the DC
In the motor 60, a yoke 73 and a motor side plate 71 form a motor housing 74, and a magnet 76 is provided inside the yoke 73, and a stator core 63 is provided inside the magnet.
The rotor core 64 is fixedly provided with a motor shaft 67 inside the stator core 63. In this conventional example, both ends of the outer peripheral surface of the motor shaft 67 are rotatably supported by the side plate 71 of the motor housing 74 via a pair of angular contact ball bearings 65. Then, the angular contact ball bearing 65 is
Ball rolling surface 7 recessed at both ends of the outer peripheral surface of the motor shaft 67
2 and a ball 65a disposed in contact with the ball rolling surface 72, and fixed to the pressing projection 71a of the side plate 71 of the motor housing 74, and allows the ball to roll together with the ball rolling surface 72. The outer ring 75 and the ball bearing 65 support the thrust acting on the motor shaft 67 and the load in the radial direction, and maintain good rotation accuracy of the motor shaft 67.

A connecting end 67a is formed at one end of the motor shaft 67 and is inserted into and locked in a coupling recess for connecting with another torque transmitting member. According to the present example, in order to rotationally drive the toothed pulley 68b for the timing belt, the DC motor 60 is turned on, the rotor core 64 is rotationally driven, the motor shaft 67, the coupling 69, and the pulley shaft 68a. Via the toothed pulley 6 for the timing belt
8b will be driven to rotate.

Next, a motion guide device 80 according to the second conventional example will be described with reference to FIGS. 11 to 14. The motion guide device 80 according to the present example has a guide rail 31 having a U-shaped cross section, which is a base, a table 38c guided along the guide rail 31, and a feed screw shaft for moving the table 38c. Ball screw shaft 98a and DC servo motor 9 for rotationally driving the ball screw shaft 98a.
0, a coupling 99 for connecting the motor shaft 103 of the DC servo motor 90 and the feed screw shaft 98a to transmit the torque of the DC servo motor 90, the motor bracket 96, and the ball screw shaft 98a to the ball bearing 16 And a support plate 26 rotatably supporting the support plate. The guide rail 31 is provided with one jetty 32, 32 extending parallel to each other with an opening recessed in the upper portion thereof, and two jetty 32 are provided on the inner surface of each jetty 32, 32 of the guide rail 31. Rolling surfaces 31a and 31b are provided respectively.

Further, on the table 38c, the rolling surfaces 31a, 31b of the guide rails 31 and the rolling surfaces 42 of the table 38c are guided so as to move freely along the guide rail 31. The table 38 is brought into contact with 47 and rolls along each of the rolling surfaces to enable infinite circulation.
a plurality of rolling elements (balls) 46 that guide the movement of c, a retainer 43 that holds the plurality of balls 46, and the table 3
A screw hole 45 that penetrates substantially the center of 8c along its moving direction and is screwed into the ball screw shaft 98a, and a plurality of balls capable of infinite circulation along the spiral groove of the ball screw shaft 98a are provided. A reverse tube 49 that returns the ball to the original position and a holding member 48 that holds the reverse tube 49 are provided. Reference numeral 31c is a bolt hole for fixing the guide rail 31.

Further, FIG. 14 shows a DC servo motor 90 used in this example. As shown in the figure, a DC servomotor 90 according to the second conventional example is a hollow motor shaft 103, a motor shaft 103 located on the outer periphery of the motor shaft 103, and a motor shaft 103 located on the outer periphery of the motor shaft 103. The stator 101 that controls the rotation of the motor shaft 103, the encoder 105 that detects the rotation speed of the motor shaft 103, the stator 101 and the encoder 105, and the ball bearing 1
04, 106, and a casing 107 that rotatably supports the motor shaft 103. In this conventional example, the motor rotor 10 is provided at an appropriate position of the motor shaft 103.
8 is provided, and the stator 101 disposed around the motor shaft 103 has a multi-phase winding 10 on a stator iron core 109 disposed at a position where the pitch is slightly deviated from the rotor 108.
2 is wound. Therefore, by sequentially exciting the windings wound around the stator core 109, the rotor 108
Are able to rotate.

The ball bearings 104 and 106 provided in the casing 107 are angular ball bearings 10, respectively.
4 and a radial ball bearing 106. Further, the casing 107 has a motor connection terminal mounting hole 111 for connecting the wiring 110 to the stator 101, and an encoder connection terminal mounting hole 113 for connecting the wiring 112 to the encoder 105. It is set up.

On the other hand, the encoder 105 includes a rotating body 115 fixed to the motor shaft 103 via a mounting member 114 fitted to the motor shaft 103, and the rotating body 115.
And a reading member 116 fixed to the casing side to detect the number of rotations. In this case, the reading body 11
Reference numeral 6 includes a photoelectric element 117 and a light receiving element 118 which are arranged symmetrically with respect to the rotating body 115, and light emitted from the photoelectric element 117 passes through a transmitting portion of the rotating body 115 to receive the light receiving element 118. By being read by
The rotation of the motor shaft 113 can be detected. Therefore, the motor shaft 10 by the encoder 105 is
It is possible to detect the rotational speed of No. 3 and electrically control the stator 101 via a control means (not shown).

In the DC servo motor constructed as described above, when the stator 101 is energized, the stator 10
The winding 102 wound around the first fixed iron core 109 is excited, and the motor shaft 103 rotates. A connecting end portion 103a is formed at one end of the motor shaft 103 and is inserted and locked in a coupling coupling recess for coupling with another torque transmitting member. That is, the motion guide device to which the rotary drive device according to this conventional example is applied is
No. 0 motor shaft 103 has one end 103a through the coupling 99, a torque transmitting member, that is, a screw shaft 98.
a is directly connected to the end of the motor shaft 10
The other end of 3 is rotatably supported by a bearing support member by a ball bearing 104.

[0011]

As described above, in the rotary drive device according to the first conventional example, the torque transmission device for driving the timing belt toothed pulley 68b is used. In order to drive the pulley shaft 68a, the torque of the motor shaft 67 that is rotationally driven by the DC motor 60 is transmitted to the pulley shaft 68a via the coupling 69, and the motor shaft 67 is installed in the motor. Both ends are rotatably supported by ball bearings 65. Similarly, in the rotary drive device according to the second conventional example, as described above, the one end 103a of the motor shaft 103 of the motor 90 is connected to the torque transmitting member, that is, the screw shaft, via the coupling 99. The motor shaft 103 is directly connected to the end portion of the shaft 98a so as to transmit the torque.
The ball bearing 106 is rotatably supported.

As described above, if the torque is transmitted through the coupling and the motor shafts 67 and 103 are rotatably supported by ball bearings at both ends in the motor, respectively, the following problems occur. Occurs. In other words, the coupling intervenes on both shafts (the shaft fixed to the torque transmission member and the shaft fixed to the rotor) to be joined.
Due to the existence of the deviation of the axis center originally present in the disk and the difficulty of exactly matching the axis centers of the two axes, vibration due to rotation or uneven rotation due to shake may occur. Therefore, it may be difficult to perform highly accurate positioning and control of highly accurate operation. Since the coupling is connected to both shafts, the weight to be rotated is increased. I. The moment of inertia and friction of the rotation are increased, and the response to the speed increase / decrease is deteriorated. Therefore, accurate positioning of the rotary drive device, control of accurate operation, and high-speed rotation may become difficult. ii. Since the driving force required for the same rotational drive of the motor increases, and the required energy increases correspondingly, there is a risk that energy efficiency will deteriorate. iii. An extra load such as twisting or bending is applied to the motor shaft, which may adversely affect coaxiality or concentricity and shorten the life of the shaft or the device. iv. The device itself becomes heavy and difficult to handle. The rotation of the motor shaft rotatably supported by the ball bearings and the rotational axis of the torque transmission member cause uneven rotation, and the bending of the shaft causes abnormal resistance. This causes abnormal vibration of the rotating shaft. Since the coupling by coupling is not always perfect, backlash may occur, which may cause an error in positioning or the like. Due to the insertion of the coupling, the axial length becomes long, the space occupied by the device increases, the space is taken up, and the space utilization efficiency is poor. Due to the presence of the coupling, the number of parts is increased, which may take time and effort for manufacturing.

Therefore, in order to solve the above problems, the present invention eliminates the need for a coupling and integrally forms a motor shaft and a torque transmission member into a long rotary body, which is rotatably supported at both ends thereof. By eliminating the inconsistency of the shaft center of the rotation drive device, increasing the moment of inertia and preventing the occurrence of abnormal rotation resistance, preventing abnormal vibration of the rotating shaft, making it compact, lightweight, improving positioning accuracy, improving rotation accuracy, Furthermore, the purpose is to reduce the number of parts.

[0014]

In order to solve the above technical problems, the present invention comprises a stator fixedly provided on a base portion and a rotor which is rotated by an electromagnetic force between the stator. A motor, a long rotating body that is fixedly provided concentrically with the rotor and penetrates the rotor, and a rotation support that is provided at the base and rotatably supports the long rotating body at both ends of the long rotating body. And a torque transmitting member that is integrally formed with the long rotating body between one of the rotation supporting members and the rotor and that transmits the torque of the long rotating body to another member.

Here, the "electromagnetic force" means, for example, that the stator has a stator winding and a magnetic field is generated by passing an electric current, and the rotor is, for example,
When it is formed of a permanent magnet, it is an attractive force and a repulsive force generated by the interaction between the magnetic field generated in the coil by passing a current through the stator and the magnetic field generated by the rotor. Further, in the present invention, the torque transmitting member is “integrally formed in the long rotating body between the rotation supporting member and the rotor, and transmits the torque of the long rotating body to another member”. Therefore, the coupling provided at the end of the long rotating body, or the one provided at the central portion and only transmitting torque to the long rotating body itself is excluded from the torque transmitting member of the present invention. To be done.

Examples of the torque transmitting member include rotating bodies such as a screw shaft, a gear shaft, a pulley shaft, and a spline shaft.
These are fixed concentrically with the long rotating body. Further, in this case, the torque transmitting member and the other members transmitting the torque are nuts fixed to the respective shafts (ball nuts when balls are present), gears, toothed pulleys for timing belts, And bosses. Further, the rotation supporting members provided at both ends of the long rotating body are, for example, an angular ball bearing that supports axial thrust at one end and a shaft supporting member at the other end. It is a radial ball bearing that supports external force in the vertical direction.

[0017]

The magnetic field is generated by passing an electric current through the stator provided at the base to rotate the rotor, and the long rotating body which penetrates the rotor and is fixed concentrically with the rotor is rotationally driven. At that time, since the rotor and the long rotating body do not move relative to each other, the movement of the rotor, that is, the torque is faithfully transmitted to the long rotating body.

Further, the torque of the long rotating body is faithfully transmitted to other members via the torque transmitting member formed integrally with the long rotating body. That is, according to the present invention, the rotation of the rotor is transmitted to the torque transmission member without interposing the coupling. Therefore, the shaft center can be exactly matched between the rotor and the torque transmission member via the long rotating body.

Since no coupling is required,
It is possible to prevent the moment of inertia from increasing due to the presence of the coupling. As a result, the driving force required to drive the rotation can be reduced.

Furthermore, since no coupling by coupling is required, rattling does not occur. Further, the axial length due to the insertion of the coupling does not become long.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary drive device 2 according to a first embodiment of the present invention.
0 will be described with reference to FIG. As shown in the figure, in the rotary drive device 20 according to the present embodiment, an electromagnetic force between the stator 12 fixed to the base portion 11 and having the stator winding 13 and the stator 12 is applied. A motor 10 including a rotating rotor 14, a long rotating body 17 penetrating the rotor 14 and fixed concentrically with the rotor 14, and a long rotating body 17 provided on the base 11 at both ends of the long rotating body 17. Rotation supporting members 15 and 16 that rotatably support the long rotating body 17 are provided.

Further, between the one rotation support member 16 of the long rotator 17 and the motor 10, the long rotator 17 is integrally formed by being fitted into the long rotator 17.
There is provided a pulley shaft 18a which is a torque transmission member for transmitting the torque generated by the rotational driving of No. 7 to the timing belt toothed pulley 18b which is another member. Further, an adhesive material 19 for bonding the rotor 14 to the long rotating body 17 is provided between the rotor 14 and the long rotating body 17.

Further, in this embodiment, the rotation supporting members 15 and 16 are two sets of angular ball bearings each supporting an external force in the axial direction and a radial ball bearing supporting a load perpendicular to the shaft. is there. Further, the rotary drive device 20
As shown in the same figure, it has a disk 21 for an encoder for measuring the rotation angle, an oil seal 22, a C-shaped retaining ring 23 for a shaft, an O-ring 24, and a casing 25. Reference numeral 10 represents a motor, a stator 13 fixedly provided on the base 11, a rotor 14 rotating by electromagnetic force between the stator 13, a casing 25 thereof, and the rotor 14 penetrating the rotor 14. 2 shows a portion including a long rotating body 17 fixedly provided concentrically with the rotor 14, a disc 21 for an encoder, and a casing 25, which are rotationally driven. Further, reference numeral 26 is a support plate for fixing the ball bearing 16 to the base portion 11.

As shown in FIG. 1, when the power is turned on, a current flows through the stator winding 12 of the stator 13 to generate a magnetic field. Then, the rotor 14 rotates, and the long rotating body 17 adhered to the rotor 14 by the adhesive 19 rotates at the same angular velocity.

Due to this rotation, the pulley shaft 18a formed integrally with the elongated rotary body 17 rotates, and further, a toothed belt for timing belt which is another member fixedly provided on the pulley shaft 18a. The pulley 18b rotates and torque is transmitted. At that time, the rotor 1
4. Since the long rotator 17 and the pulley shaft 18a are formed concentrically and integrally, it is possible to perform rotational drive with no sway or rattling, good responsiveness, and energy efficiency.

Next, the motion guide device 30 according to the second embodiment will be described with reference to FIGS. 2 and 3. This embodiment also uses the motor 10 as in the first embodiment, but unlike the first embodiment, as the torque transmission member, the ball screw shaft 38 is used instead of the pulley shaft 18a used in the first embodiment.
a is used. Further, as shown in the figure, the table 38c is provided with a ball screw hole 45, and the ball screw shaft 38a is screwed into the ball screw hole 45.
A plurality of balls 38 are provided in the spiral groove of the ball screw shaft 38a.
b is held via the return tube 49 so as to be capable of infinite circulation. The table 38c according to the present embodiment
Regarding the sectional view taken along the line CC ′ of FIG.
2 is shown in FIG. 12 for the DD ′ sectional view of FIG. 2.

In this embodiment, as in the first embodiment, in the long rotary body 37, it is integrally formed between the one rotary support and the rotor, and is generated by the rotational drive of the long rotary body. The torque is transmitted to other members.

Here, the other member to which the ball screw shaft tries to transmit torque is a ball row made up of a plurality of infinitely circulating balls provided in the spiral groove of the ball screw.

In this embodiment, when the power is turned on, the rotor 14 of the motor 10 is rotationally driven, and the rotor 14
The long rotary body 37 fixedly provided at the same time rotates, and the ball screw shaft 38a integrally provided on the long rotary body 37 rotates. Then, a moving body having a spiral groove for holding the ball row via the ball row provided in the spiral groove of the ball screw shaft 38a (for example, a table of a motion guide device, an inner block).
Move in the axial direction. With the above configuration, even in the present embodiment, as in the first embodiment, the rotor 14, the long rotating body 17, and the pulley shaft 18a are formed concentrically and integrally, so that runout or rattling occurs. Unresponsive, responsive,
Further, it is possible to perform rotational driving with high energy efficiency.

Further, a motion guide device 40 according to the third embodiment is shown in FIGS. The motion guide device 40 according to the present example includes a rotary drive member 1 fixedly provided on a base portion 51.
0, a long rotating body 57 that is rotationally driven by the rotation driving member 10, a ball bearing 16 that rotatably supports the long rotating body 57 at one end thereof with respect to the support plate 26, and the ball bearing 16. The support plate 26 fixedly provided on the base portion 51, a ball screw shaft 58a which is a torque transmission member integrally formed with the elongated rotary body 57, and a ball screw shaft 58a screwed to the ball screw shaft 58a. A block 56 provided so as to be movable in the axial direction by the rotational drive of 58a.
And two outer rails 59a and 59b fixedly provided on the base 51, and the outer rails 59a and 59b.
Blocks 52, 53, each of which is guided to move along b
54, 55 and fixedly supported by the block 56,
The table 59 is provided so as to be movable by rotationally driving the ball screw shaft 58a.

Further, each block 52 (53, 54,
The structure of 55) is shown in FIG. As shown in the figure, each block rolls along a total of four rolling surfaces provided on the upper and side surfaces of the outer rail 59a (59b) and a rolling surface 52c provided on the block 52. A load ball row 52b composed of a plurality of balls capable of infinite circulation for guiding the movement, a grease nipple 52a for supplying grease, an end plate 52e, and an end seal 5
2d and.

The motion guide device according to this example operates as follows. When the rotor 14 of the motor 10 rotates, a long rotating body 57 that is fixed concentrically through the rotor 14 rotates, and a ball that is a torque transmitting portion provided on the long rotating body 57. The screw shaft 58a rotates. Then, the block 5 that is screwed into the ball screw shaft 58a.
6 moves along the ball screw shaft 58a, and a table 59 fixedly provided on the block 56 is supported by the blocks 52, 53, 54, 55 and guided by the outer rails 59a, 59b. Move along the axial direction of the rotation axis. Also in this example, as in the first and second embodiments, the shafts are not coupled by using the coupling, so that the torque generated by the motor 10 is accurately transmitted to the table 59 via the ball screw shaft 58a and the block 56. It is possible to perform torque-transmitted rotation drive with no rattling, good responsiveness, and energy efficiency.

A rotary drive device 50 according to the fourth embodiment will be described with reference to FIGS. 7 and 8. As shown in the figure,
The rotary drive device 50 according to the present example is applied to a winding machine, and includes the motor 10 fixedly provided to the frame 81, a long rotary body 87 that is rotationally driven by the motor 10. A ball bearing 16 that rotatably supports the long rotating body 87 at one end with respect to the support plate 86, a support plate 86 that is provided by fixing the ball bearing 16 to the frame 81, and the long rotating body 87. A drum having a spline shaft 88a, which is a torque transmitting member, integrally formed on the inside thereof, and a hollow rotator, the inner surface of which is provided with a boss 88c that fits into the spline shaft 88a, and the winding 83 is wound around the outer surface thereof. 79 and a winding wire inlet / outlet hole 82 for positioning the winding wire 83 when winding or unwinding the winding wire 83 are provided on the bottom 81 a of the frame 81.

The spline shaft 88a is provided with a plurality of key grooves parallel to the axial direction, and the boss 88c is fitted with the key grooves through a plurality of balls 88b capable of infinite circulation. Is provided.

In FIG. 8, a plurality of balls 88b are provided in the groove of the spline shaft 88a provided on the outer periphery of the elongated rotary body 87.
Is held, allowing smooth movement in the axial direction. When winding or unwinding the winding wire according to the present embodiment, the rotor 14 and the long rotating body 87 are rotationally driven by the motor 10. This rotation direction is drum 7
Winding direction of the winding wire wound around 9, and
It is determined by whether to wind or unwind.
By the rotational driving of the motor 10, the long rotating body 87 is
The spline shaft 88a formed integrally with the rotatably driven boss 8 to which the spline shaft 88a is fitted.
8c rotates, and the winding is wound or unwound. At that time, since the winding wire 83 is put in and taken out through the winding wire insertion / removal hole 82 provided in the bottom portion 81a of the frame 81, the drum 79 is mounted on the spline shaft according to the winding position of the winding wire. The ball reciprocates in the axial direction of 88a as the ball rolls.

Also in this embodiment, as in the first, second and third embodiments, since the shafts are not coupled by using the coupling, the torque generated by the motor 10 is the spline shaft 88.
Torque is accurately transmitted to the drum 79 via a, and it is possible to perform rotational drive with no rattling, good responsiveness, and energy efficiency.

In addition to the above embodiments, the torque transmission member may be a gear shaft and other members such as gears and sprockets may be used. Besides, a worm gear may be provided as another member. The rotary drive of the rotary drive device described above is not limited to the case of continuous rotation, and may be the case of discontinuous rotation like a step motor.

[0038]

As described above, according to the present invention, the long rotary body penetrates the rotor, the rotor is fixedly provided concentrically with the long rotary body, and the torque transmission portion is long. It is formed integrally with the rotating body, and both ends thereof are rotatably supported, and no coupling is provided between the rotor for rotationally driving and the torque transmitting portion. Therefore, the shaft center of the torque transmission unit and the shaft center of the rotor can be made to exactly coincide with each other (satisfies coaxiality and concentricity) through the long-sized rotating body, so that rotation unevenness caused by vibrations and runouts can be prevented. It is possible to prevent the occurrence and to perform highly accurate positioning and highly accurate operation control.

Since the coupling is not connected to both shafts, there is no weight increase in the object of rotation. Therefore, i. Since the moment of inertia can be suppressed to be small, the responsiveness to the increase / decrease of the rotation speed is improved. Therefore, it is possible to perform accurate positioning of the rotary drive device and control the operation of the rotary drive device with high accuracy, and it is possible to rotate at high speed. ii. Since the moment of inertia can be kept small,
Since the driving force required for the same rotary drive can be suppressed to a small value, the energy required for that can be reduced and the energy efficiency can be improved. iii. No extra load such as twisting or bending is applied to the motor shaft, and the life of the shaft or bearing can be extended. iv. Since the device itself is lighter, the device can be made lighter and easier to handle.

The abnormal vibration of the rotary shaft due to the occurrence of abnormal resistance due to the bending of the shaft is prevented. There is no backlash due to incomplete connection,
Positioning and operation control can be performed with high precision. The length of the long rotating body in the axial direction can be short, and the device can be made compact. Reduces the number of parts without the need for parts that make up the coupling itself and parts for mounting the coupling.
The manufacturing process can be simplified.

[Brief description of drawings]

FIG. 1 is a diagram showing a rotary drive device according to a first embodiment. FIG. 1A is a plan view of a rotary drive device 20, and FIG. 1B is a sectional view taken along line AA ′ of FIG.

2A and 2B are diagrams showing a motion guide device according to a second embodiment. FIG. 2A is a plan view of the motion guide device 40, and FIG. 2B is a sectional view taken along line BB ′ of FIG. 2A.

FIG. 3 is a view showing a ball screw shaft used in the motion guide device according to the second embodiment.

FIG. 4 shows a motion guide device according to a third embodiment.
DD 'line sectional view

FIG. 5 is a diagram showing a motion guide device according to a third embodiment.

FIG. 6 shows a motion guide device according to a third embodiment.
EE ′ line view and FF ′ line view cross-sectional view of FIG. 3A is a partial cross-sectional view of FIG.
Is a partial sectional view taken along the line GG 'of FIG.

FIG. 7 is a sectional view showing a rotation drive device according to a fourth embodiment.

FIG. 8 is a diagram showing a spline shaft used in a rotary drive device according to a fourth embodiment. FIG. 8 (a) is a front view and FIG. 8 (b) is a side view.

FIG. 9 is an overall sectional view of a rotary drive device according to a first conventional example.

FIG. 10 is a partially cutaway perspective view of a motor of a rotary drive device according to a first conventional example.

FIG. 11 is a diagram showing a motion guide device according to a second conventional example. FIG. 11 (a) is a partial sectional side view, and FIG. 11 (b) is a plan view.

FIG. 12 is a cross-sectional view of the motion guide device according to the second conventional example, taken along line HH ′ of FIG. 11.

FIG. 13 is a sectional view of the motion guide device according to the second conventional example, taken along line II ′ of FIG. 11.

FIG. 14 is a sectional view showing a motor of a motion guide device according to a second conventional example.

[Explanation of symbols]

20, 50 ... Rotational drive device 30, 40 ... Motion guide device 10 ... Motor 11,51 (31, 71) ... Base (outer rail, frame) 13 ... Stator 14 ... Rotor 15, 16 ... Rotation support member (angular ball bearing) , Radial ball bearings) 17, 37, 57, 87 ... Long rotating body 18a (38a) ... Pulley shaft (ball screw shaft) 18b (38b) ... Timing belt toothed pulley 19 ... Adhesive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Kinashi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A motor comprising a stator fixed to a base and a rotor rotated by an electromagnetic force between the stator, and a length fixedly provided concentrically with the rotor penetrating the rotor. A long rotary body, a rotation support member provided on the base for rotatably supporting the long rotary body at both ends of the long rotary body, and the long rotary body between one of the rotary support members and the rotor. A rotary drive device, comprising: a torque transmission member that is integrally formed with a body and that transmits the torque of the elongated rotary body to another member. 2. The torque transmitting member is a rotating body such as a screw shaft, a gear shaft, a pulley shaft, and a spline shaft, and the other members are a nut, a gear, a pulley, and a boss, respectively. The rotary drive device according to claim 1. 3. An angular ball bearing is provided at one end of the rotary support provided at both ends of a long rotary body, and a radial ball bearing is provided at the other end. The rotary drive device according to claim 1, wherein