JPH102358A - Electromagnetic brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts by providing a coil assembly to be integrated with a large cylinder with a flange part clamped in a space between the flange part and a connecting plate in such a manner as to be bulged inward in the radial direction, and forming an adsorbing surface on the flange part. SOLUTION: A coil assembly 15 is integrally provided on a large cylinder 23 with a flange part 28 clamped in a space between the flange part and a connecting plate 24 in such a manner as to be bulged inward in the radial direction, and an attracting surface 51 is formed on the flange part 28. On the other hand, a part of the outer peripheral edge part of an armature 17 opposite to the flange part 28 is provided with a ring-shaped friction material 50 extending over the whole periphery fixed thereto by sticking or the like in such a manner as to be a little projected from the surface of the flange part 28 side of the armature 17 with a step difference. The attracting surface 51 of the flange 28 part is formed to be flat by machining. Thus, the attracting surface 51 of the flange part 28 is not formed by another member different from the yoke, so as to reduce the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a small cylinder surrounded by a coil assembly formed by winding a coil around a bobbin;
A yoke is constituted by a large cylindrical body surrounding the coil assembly, and a disc-shaped connecting plate connecting one end of the small cylindrical body and the large cylindrical body. A disk-shaped armature that is spring-biased in a direction facing the suction surface provided on the side and away from the suction surface,
The present invention relates to an electromagnetic brake which is engaged and connected so as to be capable of being attracted and moved to an attraction surface in accordance with excitation of the coil.

[0002]

2. Description of the Related Art Conventionally, in such an electromagnetic brake, a suction surface is generally formed on a member fixed to a yoke.

[0003]

However, if the suction surface is formed on another member different from the yoke as in the prior art, not only the number of components is increased but also the member is assembled on the yoke. Installation work is also necessary and the number of assembling work steps increases.

The present invention has been made in view of the above circumstances, and has as its object to provide an electromagnetic brake in which the number of parts and the number of assembly operations are reduced.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a small cylinder surrounded by a coil assembly in which a bobbin is wound with a coil, and a large cylinder surrounding the coil assembly. A yoke is composed of a body and a disc-shaped connecting plate that couples one end of the small cylinder and the large cylinder to a braking shaft inserted into the small cylinder, and to a suction surface provided on the yoke side. A disk-shaped armature, which is spring-biased in a direction opposite to and away from the suction surface, is engaged with and connected to the suction surface so as to enable suction movement in accordance with excitation of the coil. The body is provided integrally with a flange portion for holding the coil assembly between the connection plate and the connecting plate so as to protrude inward in the radial direction, and the flange portion has an attraction surface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 4 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an electromagnetic brake, and FIG. 2 is a view showing a shaft to be braked, a holder, a return spring, an armature and a thrust biasing spring. FIG. 3 is an exploded perspective view, FIG. 3 is a plan view of a return spring, and FIG. 4 is a plan view of an armature.

First, in FIG. 1, this electromagnetic brake is
It is attached to the operating device so as to brake the operating portion by braking the shaft 11 connected to the operating portion of the operating device, the internal structure of which is omitted, and is provided integrally with the casing 12 of the operating device. A yoke 14 attached to the bracket 13, a coil assembly 15 housed and disposed in the yoke 14, a holder 16 press-fitted and fixed to the braked shaft 11, and a circle engaged with and coupled to the holder 16. And a plate-shaped armature 17.

The coil assembly 15 is formed by covering a synthetic resin bobbin 18 and a coil 19 wound around the bobbin 18 with a coating portion 20 made of synthetic resin. It is formed in a cylindrical shape.

The yoke 14 is inserted into the center hole 21 of the coil assembly 15, and a small metal cylinder 22 surrounded by the coil assembly 15 and a coil assembly 15.
A large cylindrical body 23 made of a magnetic metal surrounding the small cylindrical body 22 and the large cylindrical body 23 formed of a magnetic metal in a disk shape.
And a connecting plate 24 that connects between one ends thereof, and is formed in a concentric double cylindrical shape with one end closed. Small cylinder 22
Is formed into a bottomed cylindrical shape having an end wall 22a at one end which is in contact with the inner surface of the connecting plate 24, and a caulking shaft protruding outward in the axial direction at the center of the end wall 22a. Part 25
Are provided coaxially and integrally. On the other hand, a through hole 26 is provided coaxially at the center of the connecting plate 24,
6 by caulking the outer end of the caulking shaft portion 25 passing through
By caulking engagement with the outer surface of 4, one end of the small cylindrical body 22 is coaxially coupled to the center of the connecting plate 24. An annular step 23a facing outward is provided at one end of the large cylindrical body 23.
Is formed on the inner surface side, and a thin-walled cylindrical portion 23b is integrally provided, and a connecting plate 24 having an outer peripheral edge engaged with the step portion 23a.
The thin cylindrical portion 23b is swaged and engaged with the outer peripheral edge of the connecting plate 24, whereby one end of the large cylindrical body 23 is connected to the outer peripheral edge of the connecting plate 24.

The large cylinder 23 has a small cylinder 22 at the other end.
Is formed to be longer than the small cylindrical body 22 so as to extend toward the bracket 13 side from the other end of the large cylindrical body 23, and the other end of the large cylindrical body 23 is fitted to the bracket 13 formed in a cylindrical shape. The other end of the large cylindrical body 23 is positioned and connected to the bracket 13 by being fastened to the bracket 13. Moreover, an O-ring 27 is provided between the other end of the large cylindrical body 23 and the bracket 13.

At a position corresponding to the other end of the small cylindrical body 22, the large cylindrical body 23 is provided with a flange portion 28 projecting radially inward.
The coil assembly 15 is provided by being integrally formed during the cold forging of the large cylindrical body 23, and is sandwiched between the flange portion 28 and the connecting plate 24. Thus, the coil assembly 15
An O-ring 29 is provided between the outer circumference of the
However, an O-ring 30 is interposed between the inner circumference of the coil assembly 15 and the outer circumference of the small cylindrical body 22, respectively.

The large cylindrical body 22 is provided with a notch 31 at a portion closer to the connecting plate 24 than the O-ring 29, and covers the coil assembly 15 by facing a pair of terminals 32 connected to the coil 19. A coupler part 20 a provided integrally with the part 20 is projected from the notch 31 to the outside of the large cylindrical body 23.

The braked shaft 11 is rotatably penetrated through the bracket 13 and coaxially inserted into the small cylindrical body 22. An oil seal 34 and a ball bearing are provided between the braked shaft 11 and the bracket 13. A certain first bearing 3
The second bearing 36 is interposed between one end of the shaft 11 to be braked and one end of the small cylindrical body 22. Second bearing 3
Numeral 6 is made of a nonmagnetic material, for example, a copper-based metal, is formed in a ring shape, and is press-fitted and fixed to one end of the small cylindrical body 22. On the other hand, one end of the braked shaft 11
A small-diameter shaft portion 11a is provided coaxially via a step portion 11b slidably in contact with the bearing 36, and the small-diameter shaft portion 11a is fitted to the second bearing 36 so as to be capable of sliding in the circumferential direction.
In the casing 12 of the operating device, the braked shaft 1
A gear 37 is provided at one end of the shaft 11 to be braked.
Is interlocked and connected to the operating portion of the operating device via the gear 37.

Referring also to FIG. 2, the holder 16 has a disk portion 16b extending radially outward on the other end of the cylindrical portion 16a, which is arranged by inserting one end into the small cylindrical body 22 slightly. Are formed integrally and continuously until the other end of the cylindrical portion 16a comes into contact with an annular step portion 11c provided on the braked shaft 11 in the vicinity of the first bearing 35, facing the holder 16 side. The braked shaft 11 is pressed into the cylindrical portion 16a. The armature 17 has a through hole 38 at the center thereof for coaxially inserting the cylindrical portion 16a of the holder 16 and is formed in a disk shape from a magnetic metal.
A return spring 39 is provided between 6 b and the armature 17.

Referring also to FIG. 3, the return spring 39 is
The cylindrical portion 1 of the holder 16 is made of a thin metal plate.
A disk-shaped substrate portion 39a having an insertion hole 40 at the center thereof through which the base portion 6a is inserted, and base portions of the arm portions 39b... It is. The substrate portion 39a is in contact with the surface of the holder 16 on the armature 17 side of the disk portion 16b, and is provided at a plurality of, for example, three, positions at equal intervals in the circumferential direction of the substrate portion 39a. And the disc portions 16 of the holder 16 corresponding to the coupling holes 41.
The substrate portion 39a is coupled to the disk portion 16b of the holder 16 by rivets 43 inserted into the coupling holes 42 provided in the b.

Each of the arms 39b is formed by cutting and raising the substrate 39a. In the vicinity of the coupling holes 41 for coupling the substrate 39a to the disk 16b,
The base ends of the arms 39b are connected to the substrate 39a. In addition, the tip of each arm 39b is located at the virtual equilateral triangle 44 'when the virtual equilateral triangle 44 connecting the centers of the coupling holes 41 is angularly displaced by, for example, 30 degrees around the center of the substrate 39a. It is set to be located at each vertex. At the distal end of each arm 39b, a long hole-shaped coupling hole 45 is provided, and as shown in FIG.
Are provided with coupling holes 46.
, 46 are connected to the armature 17 by rivets 47, respectively.

According to such a return spring 39, the armature 17 facing the flange 28 of the large cylindrical body 23 and the other end of the small cylindrical body 22 is moved in the direction away from the flange 28 and the small cylindrical body 22. As a result, the end of the armature 17 near the holder 16 is regulated by the rivets 47 contacting the disk portion 16b of the holder 16.

The plurality of rivets 43 for connecting the return spring 39 to the holder 16 are integrally and coaxially provided with engaging pins 48 extending to the armature 17 side. Of the engagement pins 48 ...
Are provided for inserting the respective holes. Moreover, each of the engaging holes 49 is formed as a long hole extending in the radial direction of the armature 17.

A ring-shaped friction material 50 extending all around the outer peripheral edge of the armature 17 facing the flange 28 slightly protrudes from the surface of the armature 17 on the flange 18 side. In this manner. The friction material 50 is formed by bonding a base material made of, for example, cork and a friction modifier such as rubber with a binder. On the other hand, a flange 2 integral with the large cylindrical body 22
The surface of the armature 8 facing the armature 17 is formed flat by machining as a suction surface 51 for frictionally engaging the friction material 50.

Incidentally, a ring is formed between the inner ring 35a of the first bearing 35, which is a ball bearing, and the holder 16 so as to make substantially one revolution around the braked shaft 11, and both ends of the braked shaft 11 are provided. A thrust biasing spring 52 twisted so as to be displaced in the axial direction is provided, and the spring force of the thrust biasing spring 52 causes the holder 16, that is, the braked shaft 11 to which the holder 16 is coupled, to be a step at one end thereof. The portion 11b is elastically urged in a direction in which the second bearing 36 supports the portion 11b in the thrust direction.

Next, the operation of this embodiment will be described. In the demagnetized state of the coil 19, no electromagnetic force for attracting the armature 17 to the attraction surface 51 is generated, and the braked shaft 11 is allowed to idle. . Therefore, the braked shaft 11
And the operation of the linked actuator is allowed. When the coil 19 is excited, the armature 17 generates an electromagnetic force and the armature 17 resists the spring force of the return spring 39.
The rotation of the armature 17 is stopped by being attracted to the first side and the friction material 50 being frictionally engaged with the attraction surface 51.
Moreover, since the engagement pins 48 connected to the holder 16 are inserted into the engagement holes 49 of the armature 17, the engagement pins 48 are engaged with the engagement holes 49 and the holder 16, that is, the shaft to be braked. 11 will be stopped, and the operation of the actuator will also be stopped. At this time, since the friction material 50 slightly protrudes from the surface of the armature 17 facing the suction surface 51, the suction holding force of the armature 17 on the suction surface 51 is inevitably reduced. The frictional force between the damping shaft 50 and the suction surface 51 is increased.
1 can be surely performed.

In such an electromagnetic brake, the small cylindrical body 22 constituting the yoke 14 is formed into a bottomed cylindrical shape having an end wall 22a at one end which is in contact with the inner surface of the connecting plate 24, and the end wall 22a The caulking shaft portion 25, which is integrally and coaxially protruded from the center of the connecting plate, penetrates through the through hole 26 provided at the center of the connecting plate 24 and is caulked and engaged with the outer surface of the connecting plate 24. The concentricity of the body 22 and the connecting plate 24 can be increased, and the concentricity of the large cylindrical body 23 and the small cylindrical body 22 connected to the outer periphery of the connecting plate 24 can also be increased. Moreover, since the large cylindrical body 23 is positioned and coupled to the bracket 13, the first bearing 35 provided between the braked shaft 11 and the bracket 13 and the braked shaft 11
In addition, the axis of the second bearing 36 provided between the small cylindrical bodies 22 can be easily and accurately aligned.

A flange 28 for holding the coil assembly 15 between the connecting plate 24 and the coil assembly 15 is provided integrally on the large cylindrical body 23 so as to extend inward in the radial direction. As a result, the number of parts can be reduced as compared with the case where the suction surface is formed on another member different from the yoke, and the number of assembling work steps is reduced by eliminating the need for assembling a separate member. Can also be achieved.

The holder 16 fixed to the shaft 11 to be braked
Are provided on the armature 1.
7 are respectively inserted into the plurality of engagement holes 49 provided in the holder 7. Since each of the engagement holes 49 is formed as a long hole extending along the radial direction of the armature 17, Shaft 11 to be braked by armature 17
Responsibility can be improved while taking into account assembly errors. That is, by forming each of the engaging holes 49 as long holes along the radial direction of the armature 17, the engaging pins 48 and the engaging holes 49 along the circumferential direction of the armature 17 are formed.
The clearance between the engagement pins 48 and the engagement holes 49 along the radial direction of the armature 17 is made relatively large while the clearance between the engagement pins 48 and the engagement holes 49 in the radial direction of the armature 17 is made relatively large. In addition, the armature 17 can be easily attached to the shaft 11 to be braked.

Further, the first bearing 3 which is a ball bearing
The thrust biasing spring 52 is provided between the inner ring 35a and the holder 16 of the fifth bearing 5, and the braked shaft 11 has one end thereof connected to the second bearing 3.
By being resiliently biased in the thrust supporting direction at 6, the gap between the friction material 50 and the suction surface 51 can be set to a value as small as possible to reduce the impact noise.
In other words, the braked shaft 11 is always urged in a direction in which one end thereof is supported by the second bearing 35 in the thrust direction, so that the braked shaft 11 is prevented from rattling in the axial direction, and the friction material 50 and Based on the fact that the gap between the attraction surfaces 51 can be kept constant, even if the gap is set smaller, the friction material 50 and the attraction surface 51 do not collide when the coil 19 is demagnetized. The impact noise can be reduced by reducing the size.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0028]

As described above, according to the present invention, a flange for holding the coil assembly between the large cylindrical body and the connecting plate is integrally provided so as to protrude inward in the radial direction. Since the suction surface is formed on the surface, the number of parts can be reduced and the number of assembling work steps can be reduced as compared with the conventional one in which the suction surface is formed on another member different from the yoke. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic brake.

FIG. 2 is an exploded perspective view of a shaft to be braked, a holder, a return spring, an armature, and a thrust biasing spring.

FIG. 3 is a plan view of a return spring.

FIG. 4 is a plan view of the armature.

[Explanation of symbols]

 Description of Reference Numerals 11: shaft to be braked 14: yoke 15: coil assembly 17: armature 18: bobbin 19: coil 22: small cylinder 23: large cylinder 24 ..Connection plate 26... Through hole 28.

Claims (1)

[Claims] A small cylinder (22) surrounded by a coil assembly (15) formed by winding a coil (19) around a bobbin (18), and a large cylinder surrounding the coil assembly (15). (23) small cylinder (22) and large cylinder (23)
A yoke (14) is constituted by a disc-shaped connecting plate (24) connecting one end of the yoke (14). The yoke (14) is attached to the brake shaft (11) inserted into the small cylindrical body (22). The disk-shaped armature (1) is spring-biased in a direction opposite to the provided suction surface (51) and away from the suction surface (51).
7) is a suction surface (5) corresponding to the excitation of the coil (19).
In the electromagnetic brake which is engaged and connected so as to be capable of being attracted and moved to 1), a flange portion (2) for holding the coil assembly (15) between the large cylindrical body (23) and the connecting plate (24).
An electromagnetic brake characterized in that the flange (28) is integrally provided so as to protrude inward in the radial direction, and the suction surface (51) is formed on the flange (28).