JP2003113876A - Excitation-free operation type electromagnetic brake, and linear working machine with the electromagnetic brake mounted thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excitation-free operation type electromagnetic brake with a shaft joint function added to a rotor hub without increasing the size, and a linear working machine with the electromagnetic brake mounted thereon. SOLUTION: In the excitation-free operation type electromagnetic brake 41 comprising a field 43 with an electromagnetic coil 42 and a brake spring built therein, a fixed plate 44 fixed to an end face of the field 43 with a predetermined space therebetween, a rotor 45 disposed within the predetermined space adjacent to the fixed plate 44, an armature 46 which is disposed between the rotor 45 and the field 43, and attracted to the field 43 side against the urging force of the brake spring when the electromagnetic coil 42 is energized, and a substantially cylindrical rotor hub 47 which holds the rotor 45 movably in the axial direction and in an integrally rotatable manner, the rotor hub 47 has the function of the shaft joint by forming a screw hole 47b for a set screw penetrated to a shaft hole 47a in the radial direction respectively to one end side and the other end side of the rotor hub 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excitation actuated electromagnetic brake and a linear actuator equipped with the non-excitation actuated electromagnetic brake.

[0002]

2. Description of the Related Art Conventionally, a non-excitation actuated electromagnetic brake has been used with a motor, and an electromagnetic coil was excited immediately before energization of the motor to release braking of the motor shaft, and energization of the motor was cut off. Immediately after that, the power supply to the electromagnetic coil is cut off, and the motor shaft is braked.

Japanese Laid-Open Patent Publication No. 10-141404 discloses a non-excitation actuated electromagnetic brake. FIG. 6 is a sectional view showing an example of a non-excitation actuated electromagnetic brake disclosed in Japanese Patent Laid-Open No. 10-141404.

Non-excitation actuated electromagnetic brake 1 shown in FIG.
Has a mounting flange 4a interposed between the machine frame 3 to which the motor 2 is mounted and the motor flange 2a, and has a through hole 4b in which the electromagnetic coil 5 is built-in and the motor shaft 6 is inserted in the central portion. The field 4 present, the plate 7 fixed to the field 4 with a predetermined gap S between the end face of the field 4 on the side opposite to the motor flange 2a side, and the plate 7 adjacent to the plate 7 in the gap S. The friction plate 8 is disposed between the friction plate 8 and the field 4, and is pressed against the friction plate 8 by the biasing member when the electromagnetic coil 5 is not energized, and is biased by the biasing member when the electromagnetic coil 5 is energized. An armature 9 that is attracted and moved to the field 4 side against a force, and a friction plate holding portion 10 that holds the friction plate 8 so as to be axially displaceable with respect to the axis of the motor shaft 6 and to rotate integrally. And a brake hub 10 having an elastically deformable tubular portion 10b fitted to the tip portion of the motor shaft 6, and an end portion of the driven shaft 11 fitted to the outer peripheral surface of the tubular portion 10b of the brake hub 10. And a drive side coupling hub 13 connected to the driven side coupling hub 12 provided on the drive side coupling hub 13.
Is provided with a fastening portion 13b in which a slit G is formed in the radial direction between the outer peripheral surface and the inner peripheral surface thereof, and a fastening screw 14 is provided across the slit G. It is fixed to the motor shaft 6 together with the brake hub 10 by tightening 14. The driven coupling hub 12 and the driving coupling hub 13 and the leaf spring 15 are alternately attached to each other to form a flange type flexible shaft coupling.

Also, registered utility model publication No. 3058625
The publication also discloses a non-excitation actuated electromagnetic brake. FIG. 7 is a sectional view showing an example of a non-excitation actuated electromagnetic brake disclosed in Registered Utility Model Publication No. 3058625.

A non-excitation actuated electromagnetic brake 21 shown in FIG.
Is a stator 25 that has a built-in electromagnetic coil 22 and a compression coil spring 23 and is fixed to the machine frame of the motor 24, a fixed plate 26 that is fixed to the end surface of the stator 25 with a predetermined gap, and a fixed gap. Between the armature 29, which is adjacent to the stator 25, is free to move in the axial direction of the motor shaft 27 and is constrained in the rotation direction of the motor shaft 27, and is fixed to the armature 29 guided by the collar 28 and the motor shaft 27. The rotor hub 30 is restrained in the rotation direction of the motor shaft 27, and is freely fitted in the axial direction of the motor shaft 27 so as to be fitted to the rotor hub 30.
9 and the fixed plate 26, the rotor 31 is sandwiched between the armature 29 and the fixed plate 26 due to the elastic force of the compression coil spring 23 when the electromagnetic coil 22 is not energized. Occurs,
Motor shaft 27 and driven shaft 3 connected to motor shaft 27
When 2 is braked and held via the rotor hub 30 and the electromagnetic coil 22 is energized, the armature 29 is attracted and moved to the stator 25 against the elastic force of the compression coil spring 23, so that the frictional force disappears. In the non-excitation actuated electromagnetic brake 21 that releases the motor shaft 27 and the driven shaft 32, the rotor hub 30 is provided with two shaft fixing portions 30a provided with a mechanism for mechanically reducing the inner peripheral surface of the rotor hub 30. By fixing 27 and the driven shaft 32, the function of a shaft coupling is provided.

[0007]

However, the conventional non-excitation actuated electromagnetic brake 1 shown in FIG. 6 has the following problems. (1) Since the flange-type flexible shaft joint is newly added to the non-excitation actuated electromagnetic brake 1, the size is significantly increased by the amount of the flange-type flexible shaft joint. (2) Further, the inertia of the flange type flexible shaft joint becomes large, and the response of the non-excitation actuated electromagnetic brake 1 deteriorates. (3) Further, the labor of having to tighten the connection bolts of the flanges of the flange type flexible shaft joint one by one and the space and opening for attachment are required, and the device itself becomes large.

Further, another conventional non-excitation actuated electromagnetic brake 21 shown in FIG. 7 has the following problems. That is, since the inner diameter of the rotor hub 30 is reduced, the outer diameter of the rotor hub 30 is increased.
The surface area of the rotor 31 and the rotor 31 becomes small, and particularly in the case of a micro electromagnetic brake or the like, the brake torque is extremely reduced. Therefore, in order to secure the current brake torque, the size of the non-excitation operated electromagnetic brake 21 must be increased. I won't.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a non-excitation actuated electromagnetic brake in which a shaft coupling function is added to a rotor hub without increasing the size, and a linear actuator equipped with the non-excitation actuated electromagnetic brake. To do.

[0010]

In order to achieve the above object, the invention according to claim 1 of the present invention is characterized in that a field containing an electromagnetic coil and a braking spring is provided, and an end face of the field is provided with a predetermined interval. A fixed plate that is fixed, a rotor that is arranged adjacent to the fixed plate within the predetermined space, and is arranged between the rotor and the field, and when the electromagnetic coil is not energized An armature that is pressed against the rotor and is attracted and moved to the field side against the biasing force of the braking spring when the electromagnetic coil is energized, and an armature that holds the rotor so as to be axially movable and integrally rotatable. In a non-excitation actuated electromagnetic brake including a cylindrical rotor hub, one end side and the other end side of the rotor hub are radially penetrated to a shaft hole. It said rotor hub by internally threaded screw hole is formed and has a shaft coupling functions.

According to a second aspect of the present invention, there is provided a field containing an electromagnetic coil and a braking spring, a fixed plate fixed at an end face of the field with a predetermined gap, and the fixed plate within the predetermined gap. Adjacent rotors, and between the rotor and the field are pressed against the rotor by the biasing force of the braking spring when the electromagnetic coil is not energized, and the biasing force of the braking spring is applied when the electromagnetic coil is energized. In a non-excitation actuated electromagnetic brake comprising an armature that is attracted and moved to the field side against it, and a substantially cylindrical rotor hub that holds the rotor so that the rotor can move in the axial direction and integrally rotate, The front side of the rotor hub is formed with keyways, serrations, or splines, respectively, in the shaft holes on the one side and the other side. Rotor hub and has a shaft coupling functions.

According to a third aspect of the present invention, in a linear actuator, the non-excitation actuated electromagnetic brake according to the first aspect is mounted between a screw shaft and a motor shaft, and the screw shaft and the motor shaft are connected by a rotor hub. It has been done.

According to a fourth aspect of the present invention, in a linear actuator, the non-excitation actuated electromagnetic brake according to the second aspect is mounted between a screw shaft and a motor shaft, and the screw shaft and the motor shaft are connected by a rotor hub. It has been done.

[0014]

By providing fixing means for the drive shaft and the driven shaft on one end side and the other end side of the rotor hub that constitutes the non-excitation actuated electromagnetic brake, the rotor hub exerts a shaft coupling function.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A non-excitation actuated electromagnetic brake according to Embodiment 1 of the present invention will be described with reference to the drawings. Figure 1
FIG. 3 is a sectional view of a non-excitation actuated electromagnetic brake according to Embodiment 1 of the present invention. 2 shows a rotor hub of the non-excitation actuated electromagnetic brake shown in FIG. 1, where (A) is a sectional view of the rotor hub, (B) is a left side view of (A), and (C) is a right side view of (A). Is.

As shown in FIG. 1, the non-excitation actuated electromagnetic brake 41 is used by being attached to a machine frame 52 together with a motor 51.

A non-excitation actuated electromagnetic brake 41 shown in FIG.
Is a field 43 having a built-in electromagnetic coil 42 and a braking spring (not shown), a fixed plate 44 fixed to the end surface of the field 43 with a predetermined gap, and a fixed plate 44 arranged adjacent to the fixed plate 44 within the predetermined gap. Rotor 45,
Electromagnetic coil 4 arranged between rotor 45 and field 43
2 is not energized, the rotor 45 is urged by the urging force of the braking spring.
When the electromagnetic coil 42 is energized and is energized, the armature 46, which is attracted and moved to the field 43 side against the biasing force of the braking spring, and the rotor 45 that holds the rotor 45 axially movable and integrally rotatable. Rotor hub 47
It has and.

The fixing plate 44 is a collar (spacer) 4
It is fixed to the end surface of the field 43 with bolts 49 at a predetermined interval.

The inner peripheral surface of the rotor 45 is shown in FIG.
The cross-sectional shape of the outer peripheral surface of the substantially cylindrical rotor hub 47 shown in (1) (i.e., a quadrangle in this example) is formed and is slightly smaller than the outer peripheral surface of the substantially cylindrical rotor hub 47. Therefore, when the substantially cylindrical rotor hub 47 is fitted into the rotor 45, the substantially cylindrical rotor hub 47 holds the rotor 45 so as to be axially movable and integrally rotatable.

As shown in FIG. 2, a substantially cylindrical rotor hub 4 is provided.
No. 7 has a quadrangular cross-sectional shape on its outer peripheral surface, has a shaft hole 47a at its center, and its length is about 2 to 4 times that of the shaft hole 47a, and its inner and outer diameters are substantially the same as those of a conventional rotor hub. Is the same.

Further, as shown in FIG. 2, the substantially cylindrical rotor hub 47 is provided with a set screw screw hole 47b penetrating to the shaft hole 47a in the radial direction at one end side and the other end side, respectively. In this example, the setscrew screw holes 47b are formed at positions shifted by 90 degrees on one end side and at positions shifted by 90 degrees on the other end side, respectively. That is, the screw hole 47 for the set screw
b, together with a set screw (not shown), constitutes fixing means for the drive shaft and the driven shaft.

In the non-excitation actuated electromagnetic brake 41, as shown in FIG. 1, a motor shaft 53 and a driven shaft 54 are fitted in a shaft hole 47a of a substantially cylindrical rotor hub 47 in a butt shape, and a set screw screw hole is formed. They are connected by a set screw (not shown) screwed into 47b. In this example, a flat portion 53a and a flat portion 54a are formed on the motor shaft 53 and the driven shaft 54 at the portions where the setscrews abut.
That is, the substantially tubular rotor hub 47 has a function as a tubular joint in the case of a biaxial butted shaft.

Next, a non-excitation actuated electromagnetic brake according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 3 is a sectional view of a non-excitation actuated electromagnetic brake according to Embodiment 2 of the present invention. 4 shows a rotor hub of the non-excitation actuated electromagnetic brake shown in FIG. 3, (A) is a sectional view of the rotor hub, (B) is a left side view of (A), and (C) is a right side view of (A). Is.

As shown in FIG. 3, the non-excitation actuated electromagnetic brake 61 is used by being mounted on the machine frame 72 together with the motor 71 by mounting screws 75 and 76.

Non-excitation actuated electromagnetic brake 61 shown in FIG.
Is a field 63 having a built-in electromagnetic coil 62 and a braking spring (not shown), a fixed plate 64 fixed to the end face of the field 63 with a predetermined gap, and a fixed plate 64 disposed adjacent to the fixed plate 64 within the predetermined gap. Rotor 65,
Electromagnetic coil 6 arranged between rotor 65 and field 63
2 is not energized, the rotor 65 is urged by the urging force of the braking spring.
When the electromagnetic coil 62 is energized and is energized, the armature 66 that is attracted and moved to the field 63 side against the biasing force of the braking spring, and a substantially tubular member that holds the rotor 65 so as to be axially movable and integrally rotatable. Rotor hub 67
It has and.

The fixing plate 64 is fixed to the end surface of the field 63 with bolts 69 at a predetermined interval.

The rotor 65 has an inner peripheral surface having a cross-sectional shape shown in FIG.
The shape is similar to the cross-sectional shape of the outer peripheral surface of the central portion of the substantially cylindrical rotor hub 67 (i.e., a quadrangle in this example), and is slightly smaller than the outer peripheral surface of the central portion of the substantially cylindrical rotor hub 67. Therefore, when the substantially cylindrical rotor hub 67 is fitted to the rotor 65, the substantially cylindrical rotor hub 67 holds the rotor 65 so as to be axially movable and integrally rotatable.

As shown in FIG. 4, a substantially cylindrical rotor hub 6 is provided.
7 has a quadrangular cross-sectional shape of the outer peripheral surface of the central portion thereof, has a shaft hole 67a in the left and right central portions, and its length is about 2 to 4 times that of the shaft hole 67a. It is almost the same as the conventional rotor hub.

Further, as shown in FIG. 4, the substantially cylindrical rotor hub 67 has a shaft hole 67 on one end side (left side in FIG. 4).
The serration 67c is formed in a. A key groove 67d is formed in the shaft hole 67a on the other end side (left side in FIG. 4). That is, the serration 67c and the key groove 67d form a fixing means for the drive shaft and the driven shaft.

In the non-excitation actuated electromagnetic brake 61, as shown in FIG. 3, a motor shaft 73 and a driven shaft 74 are fitted and connected in left and right shaft holes 67a of a substantially cylindrical rotor hub 67. A key groove is formed in the motor shaft 73, and the motor shaft 73 is keyed to the shaft hole 67a on the right side.
The driven shaft 74 has a serration 67c of a shaft hole 67a on the left side.
Has serrations that fit into the. That is,
The substantially tubular rotor hub 67 has a function as a tubular joint in the case of a biaxial butted shaft.

The left and right shaft holes 67a of the substantially cylindrical rotor hub 67 shown in FIG. 4 are serrated 67 to the left shaft hole 67a.
Although c is formed and the key groove 67d is formed in the shaft hole 67a on the right side, a spline may be formed instead of the serration 67c or the key groove 67d. In this case, it is natural to form a spline on the motor shaft 73 or the driven shaft 74.

The non-excitation actuated electromagnetic brakes 41 and 61 according to the first and second embodiments of the present invention have the following effects. (1) Since the function of the cylindrical joint is added to the substantially cylindrical rotor hubs 47 and 67, it is possible to have the two functions of the brake and the shaft joint without changing the original brake dimension. As a result, it is possible to secure the current brake torque without increasing the size of the brake at all. (2) It is not necessary to use a flange-type flexible shaft coupling as in the conventional case, and therefore, it is possible to eliminate a large space and an opening because the number of steps for tightening the bolts of the flange portion is fastened. (3) It is not necessary to change the outer diameter of the rotor hub, the inertia at the time of rotation is not increased, and the responsiveness of a high-quality brake that is the same as the current state can be secured. (4) Since the rotor hubs 47 and 67 are not fixed to the motor shaft or the driven shaft by a mechanism for reducing the inner diameter of the rotor hub as in the conventional case, it is not necessary to increase the outer diameter of the rotor hub. With electromagnetic brakes, the brake torque can be secured without changing the existing brake dimensions.

FIG. 5 is a sectional view of a linear actuator equipped with the non-excitation actuated electromagnetic brake 41 shown in FIG.

The linear actuator 81 shown in FIG.
And a non-excitation actuated electromagnetic brake 41. The linear actuator 81 includes a ball screw shaft 82, a ball screw nut 83 fitted to the ball screw shaft 82, an inner cylinder 84 connected to the ball screw nut 83, and the ball screw shaft 8
2 and a ball screw nut 83, and an outer cylinder 85, and a cylinder receiver 8 attached to an end of the outer cylinder 85 and penetrated by an inner cylinder 84.
6 and a tip fitting 87 attached to the tip of the inner cylinder 84
And have. The motor shaft 93 and the ball screw shaft 82 form the rotor hub 4 of the non-excitation actuated electromagnetic brake 41.
They are connected by 7. Therefore, the linear actuator 8
When the ball screw shaft 82 is rotationally driven by the motor 91, the inner cylinder 84 linearly moves in the axial direction together with the ball screw nut 83, so that the not-shown operated body attached to the tip fitting 87 is moved forward or backward. .

According to the linear actuator 81, the overall length of the linear actuator can be shortened as compared with the case where a new shaft coupling is added. Also, because the current brake torque can be secured,
It is not necessary to increase the size of the power section of the motor and electromagnetic brake.

In the linear actuator 81, the ball screw shaft 82 is used as the screw shaft and the ball screw nut 83 is used as the nut. However, the present invention is not limited to this, and a trapezoidal screw shaft is used as the screw shaft. It is also possible to use a trapezoidal screw nut as the nut.

[0037]

The inventions according to claims 1 and 2 of the present invention have the following effects. (1) Since the function of the cylindrical joint is added to the substantially cylindrical rotor hub, it is possible to have the two functions of the brake and the shaft joint without changing the original brake dimension. As a result, it is possible to secure the current brake torque without increasing the size of the brake at all. (2) It is not necessary to use a flange-type flexible shaft coupling as in the conventional case, and therefore, it is possible to eliminate a large space and an opening because the number of steps for tightening the bolts of the flange portion is fastened. (3) It is not necessary to change the outer diameter of the rotor hub, the inertia at the time of rotation is not increased, and the responsiveness of a high-quality brake that is the same as the current state can be secured. (4) Since the rotor hub is not fixed to the motor shaft or the driven shaft by a mechanism for reducing the inner diameter of the rotor hub as in the conventional case, it is not necessary to increase the outer diameter of the rotor hub. , It is possible to secure the brake torque without changing the existing brake dimensions.

The inventions according to claims 3 and 4 of the present invention have the following effects. The overall length of the linear actuator can be shortened compared to the case where a new shaft coupling is added. Moreover, since the current brake torque can be secured, it is not necessary to increase the size of the power unit of the motor and the electromagnetic brake.

[Brief description of drawings]

FIG. 1 is a sectional view of a non-excitation actuated electromagnetic brake according to a first embodiment of the present invention.

2 shows a rotor hub of the non-excitation actuated electromagnetic brake shown in FIG. 1, where (A) is a sectional view of the rotor hub, (B) is a left side view of (A), and (C) is a right side surface of (A). It is a figure.

FIG. 3 is a sectional view of a non-excitation actuated electromagnetic brake according to a second embodiment of the present invention.

4 shows a rotor hub of the non-excitation actuated electromagnetic brake shown in FIG. 3, where (A) is a sectional view of the rotor hub, (B) is a left side view of (A), and (C) is a right side surface of (A). It is a figure.

5 is a sectional view of a linear actuator equipped with the non-excitation actuated electromagnetic brake shown in FIG. 1. FIG.

FIG. 6 is a sectional view of a conventional non-excitation actuated electromagnetic brake.

FIG. 7 is a sectional view of another conventional non-excitation actuated electromagnetic brake.

[Explanation of symbols]

41 ... Non-excitation actuated electromagnetic brake 42 ... Electromagnetic coil 43 ... Field 44 ... ・ Fixing plate 45 ... Rotor 46 ... Armature 47 ... Rotor hub 47a ... Shaft hole 47b ... Screw hole for set screw 48 ... ・ Color (spacer) 49 ... Bolts 51 ... Motor 52 ... Machine frame 53 ... Motor shaft 53a ... Flat portion 54 ··· Driven shaft 54a: flat portion 61 ··· Non-excitation actuated electromagnetic brake 62 ... Electromagnetic coil 63 ... Field 64 ··· Fixed plate 65 ... Rotor 66 ... Armature 67 ... Rotor hub 67a ... Shaft hole 67c ... serration 67d ... keyway 69 ... Bolt 71 ... Motor 72 ... Machine frame 73 ... Motor shaft 74 ··· Driven shaft 75 ... Mounting screws 76 ... Mounting screws 81 ... Linear actuator 82 ... Ball screw shaft 83 ... Ball screw nut 84 ... Inner cylinder 85 ... Outer cylinder 86 ... 87 ... Tips 91 ... Motor 93 ... Motor shaft

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Maejima             2-61, Jomi, Chuo-ku, Osaka-shi, Osaka             Tsubakimoto Chain Co., Ltd. F term (reference) 3J058 AA48 AA53 AA57 AA78 AA88                       BA67 CB22 CC13 CC72 CC77                       CD24 DD03 FA42

Claims (4)

[Claims] 1. A field containing an electromagnetic coil and a braking spring, a fixed plate fixed to an end face of the field with a predetermined gap, and a field arranged adjacent to the fixed plate within the predetermined gap. The rotor, which is disposed between the rotor and the field, is pressed against the rotor by the urging force of the braking spring when the electromagnetic coil is not energized, and is opposed to the urging force of the braking spring when the electromagnetic coil is energized, and is on the field side. A non-excitation actuated electromagnetic brake comprising an armature that is attracted to and moved to and an approximately cylindrical rotor hub that holds the rotor so that the rotor can move in the axial direction and integrally rotate. The rotor hub functions as a shaft joint because a set screw threaded hole is formed in each of the end sides in the radial direction to penetrate to the shaft hole. Non-excitation type electromagnetic brake, characterized by. 2. A field having a built-in electromagnetic coil and a braking spring, a fixed plate fixed to an end face of the field with a predetermined gap, and a field arranged adjacent to the fixed plate within the predetermined gap. The rotor, which is disposed between the rotor and the field, is pressed against the rotor by the urging force of the braking spring when the electromagnetic coil is not energized, and is opposed to the urging force of the braking spring when the electromagnetic coil is energized, and is on the field side. A non-excitation actuated electromagnetic brake comprising an armature that is attracted to and moved to and an approximately cylindrical rotor hub that holds the rotor so that the rotor can move in the axial direction and integrally rotate. The rotor hub has a shaft coupling because a key groove, serration, or spline is formed in each of the shaft holes on the end side. Non-excitation type electromagnetic brake, characterized in that it has a capability. 3. A linear actuator in which the non-excitation actuated electromagnetic brake according to claim 1 is mounted between a screw shaft and a motor shaft, and the screw shaft and the motor shaft are connected by a rotor hub. . 4. A linear actuator, wherein the non-excitation actuated electromagnetic brake according to claim 2 is mounted between a screw shaft and a motor shaft, and the screw shaft and the motor shaft are connected by a rotor hub. .