JPH11315867A - Non-exciting actuation type electromagnetic brake structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce parts in number, miniaturize and lighten a brake, make its output high in torque, and actualize a reduction in cost in a nonexciting actuator type electromagnetic brake equipped with a field core housing an energizing coil, an amature mounted in such a way that it can be slid in the axial direction by means of a coil spring, a disc and a side plate. SOLUTION: A plurality of spring pins 5 each of which has more than two opening parts 52 provided at its free end, are pressed in a field core, screwed in, and fixed thereto by welding and the like. And an armature and a side plate between which a disc is held, are inserted in, a ball is pressed in the inner diameter part of a spring pin 51, and the free end of the spring pin 51 is fixed to the side plate. The armature is so designed as to be guided by the spring pin 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Non-excited electromagnetic brakes are often used for braking and holding a rotating shaft of a motor, a driven shaft of a joint body, etc., which is a driving source of an industrial robot. In the market, cost competition among companies is fierce, and we need to develop new brakes to overcome the cost competition, and to reduce the cost of the brakes. The present invention
The present invention relates to a structure of such a non-excited operation type electromagnetic brake.

[0002]

2. Description of the Related Art First, a conventional non-excitation type electromagnetic brake will be described with reference to FIG. FIG. 3 is a sectional side view of a conventional non-excited operation type electromagnetic brake. In FIG. 3, an energizing coil 2 is housed in a field core 1.
The field core 1 is fixed to a stationary frame of the motor 3 or the like. Armature 4 and disk 5 slidable in the axial direction
The disk 5 is fitted with the hub 6, restricts the rotation direction, and is slidable in the axial direction. The side plate 7 is completely fixed to the field core 1 with screws 9 or the like via the collars 8 (three places). A plurality of coil springs 10 are housed in the field core 1. The hub 6 is constrained on the motor shaft 11 by a key 13 in the direction of rotation, and is firmly fixed to the shaft via a retaining ring 12 or the like. A predetermined gap a is provided between the field core 1 and the armature 4 according to the size of the collar 8, and a plurality of coil springs 10 housed in the field core 1 when the power is OFF.
The disc 5 is pressed against the side plate 7 via the armature 4 by the pressing force of the armature 4, and the disc 5 generates a torque due to the frictional force of the contact surface between the armature 4 and the side plate 7, enters a braking state, and energizes the energizing coil 2. Then, as shown in the drawing, a magnetic path Φ is formed between the field core 1 and the armature 4 to generate a magnetic attraction force, which overcomes the pressing force of the coil spring 10 and
Is sucked into the field core 1 and the gap a becomes zero.

[0003]

However, in the conventional non-excited operation type electromagnetic brake shown in FIG. 3, the side plate 7 is provided between the field core 1 and the armature 4 in order to form a brake. It must be completely restrained and fixed to the field core 1 while securing the gap a.
For this reason, it is necessary to prepare the collar 8 and the like, and there is a disadvantage that the number of parts increases, and since the insertion of the collar 8 limits the outer diameter of the disk 5 serving as the rotary friction plate to a small value. There is a problem that the effective friction radius is small, the efficiency of the generated torque of the brake is low with respect to the pressing force of the coil spring 10, and it is difficult to reduce the weight, size, and torque of the brake. Further, in order to solve the conventional problems, the present applicant filed an invention relating to "Structure of a non-excited operation type electromagnetic brake" as Japanese Patent Application No. 9-39776 on February 10, 1997. 2A and 2B show the structure of the non-excited operation type electromagnetic brake. FIG. 2A is a partial cross-sectional side view of a fixed portion of a side plate, FIG. 2B is an enlarged view of a portion B of FIG. FIG. 3 is a partial cross-sectional side view when a cylindrical pin is inserted, (D) is a partial cross-sectional side view when a ball is pressed, and (E) is an exploded perspective view after the cylindrical pin is inserted.
According to the above invention, as shown in FIG. 2, a field core 1 accommodating an energizing coil 2, an armature 4 slidably mounted in an axial direction by a coil spring 10, a disk 5, and a side This is a non-excited operation type electromagnetic brake including the plate 7.

The structure of the non-excitation operation type electromagnetic brake is as follows.
As shown in FIGS. 2A to 2D, a plurality of cylindrical pins 21 such as spring pins are fixed to the field core 1 by press-fitting, screwing, welding, or the like, and the armature 4 having the disk 5 interposed therebetween. The side plate 7 is inserted, and the ball 22 is press-fitted into the inner diameter portion of the cylindrical pin 21 so that the cylindrical pin 21
Is fixed to the side plate 7, and the armature 4 is guided by the cylindrical pin 21. The armature 4 is freely slidable in the axial direction using the cylindrical pin 21 as a guide, and the outer diameter of the ball 22 is larger than the inner diameter of the cylindrical pin 21. 2A and 2E, the cylindrical pin 21 is fixed to the field core 1, the armature 4 is inserted using the cylindrical pin 21 as a guide, and the disc 5 is mounted. It is placed on the armature 4 via the hub 6, the side plate 7 is inserted with the cylindrical pin 21 as a guide, a predetermined gap a is temporarily set, and the position of the side plate 7 is determined. The ball 22 is press-fitted with a press or the like to fix and hold the side plate 7.

[0005]

According to the present invention, in order to further improve the structure of the above-mentioned non-excited operation type electromagnetic brake, a field core accommodating an energizing coil and a coil spring are slidable in the axial direction. A non-excited operation type electromagnetic brake including a mounted armature, a disk, and a side plate, wherein a plurality of spring pins each having two or more pin openings at a free end thereof are connected to the field core. The armature and the side plate sandwiching the disc are inserted, and a ball is pressed into the inner diameter of the spring pin so that the free end of the spring pin is inserted into the side plate. And the armature is guided by the spring pin. It is intended to provide a structure of the hydraulic type electromagnetic brake.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of a non-excited operation type electromagnetic brake according to the present invention will be described below with reference to FIG. 1A and 1B show an embodiment of a structure of a non-excited operation type electromagnetic brake according to the present invention. FIG. 1A is a front view showing a state in which a spring pin has a plurality of pin openings, and FIG. (A) is a plan view showing a state of an internal pressure applied to a pin hole when the spring pin is fixed to a side plate when a ball is press-fitted, (C) is a front view of a modified example of the (A) spring pin, (D) is a plan view showing a state in which a plurality of pin openings are provided in the spring pin of (C), and (E) is a state in which a plurality of pin openings are not provided in the spring pin of (A) or (C). It is a top view which shows the state of the internal pressure which acts on a pin hole part at the time of. FIG. 3 is a cross-sectional side view of a conventional non-excited operation type electromagnetic brake as described above, which is cited to show the basic configuration of the present invention.

The present invention relates to a field core 1 containing an energizing coil 2 as shown in FIG. 3, an armature 4 slidably mounted in an axial direction by a coil spring 10, a disk 5, and a side. This is a non-excited operation type electromagnetic brake including the plate 7. As shown in FIG. 1A, a structure of a non-excited operation type electromagnetic brake as an embodiment of the present invention includes a plurality of spring pins 51 each having two or more pin openings 52 at a free end. 2A to 2D, the armature 4 and the side plate 7 with the disk 5 interposed are inserted into the field core 1 by press-fitting, screwing, welding, or the like. Ball 22 on the inside diameter of 51
And the free end of the spring pin 51 is fixed to the side plate 7, and the armature 4 is guided by the spring pin 51. Armature 4 has spring pin 51
Can slide freely in the axial direction with the
Is larger than the inner diameter of the spring pin 51. An internal pressure as shown in FIG. 1B is applied to the hole of the side plate 7. FIGS. 1C and 1D show a groove-shaped pin opening 62 so as to reduce the rigidity of the spring pin 61 and facilitate bending.
Is provided. For reference, when the spring pins 51 and 61 do not have the openings 52 and 62, the internal pressure acting on the pin holes of the side plate 7 after inserting the ball is as shown in FIG. This is because the rigidity of the opening of the spring pin is weak, so that the spring pin is easily displaced. That is, since there is a disadvantage that an appropriate internal pressure is not applied to the opposite side of the opening and the holding force is reduced, the pin opening 5
2, 62 were provided at several places to apply internal pressure to the wall.

Next, the operation will be described. In the present invention, as shown in FIG. 1, the internal pressure acting on the side plate 7 after the ball is inserted is equalized by increasing the pin opening at two or more positions only in the ball insertion portion. Further, according to the present invention, the conventional plate positioning distance collar 8 shown in FIG. 3 is eliminated, the plate fixing screw 9 is not required, and when adjusting the gap,
Since it is only necessary to press-fit the ball after the predetermined temporary setting gap a is determined in advance, the automatic assembly can be easily and easily performed by the conventional method using the collar 8, and the positioning of the collar can be performed in comparison with the conventional color method. This eliminates the necessity to perform the operation, improves the positional accuracy of the cylindrical pin, makes the sliding of the armature smooth, and stabilizes the suction and release operations of the armature.

[0009]

The structure of the non-excited operation type electromagnetic brake according to the present invention is constructed as described above, and has the following effects. The number of assembly steps is greatly reduced. After the gap a is automatically adjusted, the ball can be easily fitted by press-fitting the ball. No need for positioning collar and plate fixing screw
The structure is extremely simple and the cost can be greatly reduced. Since no collar is required, the effective friction radius of the disk can be increased, and the torque can be improved. By increasing the number of spring pin openings, the internal pressure after inserting the ball is equalized and the holding force is improved. Therefore, the entire structure of the non-excited operation type electromagnetic brake of the present invention can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a structure of a non-excited operation type electromagnetic brake according to the present invention, in which (A) is a front view showing a state in which a plurality of pin openings are provided in a spring pin,
(B) is a plan view showing the state of the internal pressure applied to the pin hole when the spring pin of (A) is pressed into the ball and fixed to the side plate, and (C) is a modified example of the spring pin of (A). (D) is a plan view showing a state in which a plurality of openings are provided in the spring pin of (C),
(E) is a top view which shows the state of the internal pressure which acts on a pin hole part when a several pin opening part is not provided in the spring pin of (A) or (C).

2A and 2B show the structure of a conventional non-excited operation type electromagnetic brake, wherein FIG. 2A is a partial cross-sectional side view of a fixed portion of a side plate, FIG. 2B is an enlarged view of a portion B of FIG. () Is a partial cross-sectional side view when a cylindrical pin is inserted, (D) is a partial cross-sectional side view when a ball is pressed, and (E) is an exploded perspective view after the cylindrical pin is inserted.

FIG. 3 is a cross-sectional side view of a conventional non-excited operation type electromagnetic brake.

[Explanation of symbols]

 1: field core 2: energizing coil 4: armature 5: disk 6: hub 7: side plate 10: coil spring 11: motor shaft 12: retaining ring 13: key 21: cylindrical pin 22: ball a: gap 51: Spring pin 52: Pin opening 61: Spring pin 62: Pin opening

Claims (1)

[Claims] 1. A non-excited operation type electromagnetic brake including a field core containing an energizing coil, an armature slidably mounted in an axial direction by a coil spring, a disk, and a side plate. A plurality of spring pins, each having two or more pin openings, are pressed into the field core,
It is fixed by screwing, welding, etc., the armature and the side plate sandwiching the disk are inserted, a ball is pressed into the inner diameter of the spring pin, and the free end of the spring pin is fixed to the side plate. Wherein the armature is guided by the spring pin.