JPH09210105A - Non-exciting acting electromagnetic brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To p1,ace a brake disk apart from a pressure receiving plate by spring force of a return member by arranging the return member for moving the brake disk from an outer hub toward an annature side, between the side surface of the brake disk and the side surface of the outer hub. SOLUTION: A compressive coil spring 19 formed as an elastic member and whose one end abuts on an embedded pin 18 and the other end abuts on the wall surface of a notch groove 17b after inserting the embedded pin 18 in a penetrating hole 17d, is housed in the housing groove 17c of an outer hub 17. A belleville spring 20 formed as a return member is housed in a recessed part 17f. The joining surface side of the outer hub 17 is faced to the joining surface of a brake disk 13, and the screw part of the embedded pin 18 is screwed around the screw hole 13b of the brake disk 13, and it is fixed. The brake disk 13 is placed apart from a pressure receiving plate by spring force of the belleville spring 20 when an armature is magnetically absorbed on a field core and it is placed apart from the brake disk 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a brake disc spline-fitted to a center hub is interposed between an armature pressed by the spring force of a compression coil spring and a pressure receiving plate receiving the spring force. The present invention relates to a non-excitation actuated electromagnetic brake that prevents generation of unpleasant noise due to backlash of spline teeth of a center hub and spline teeth of a brake disc that mesh with each other.

[0002]

2. Description of the Related Art In a conventional non-excitation type electromagnetic brake, a brake disc is spline-fitted to a center hub mounted on a rotary shaft of a machine to be braked, and spline teeth meshing with each other are circumferentially opposed to each other. By disposing an elastic member between the surfaces and displacing the brake disc in the rotation direction of the rotating shaft with respect to the center hub so that the tooth contact surfaces come into contact with each other, the unpleasant noise caused by the backlash of the spline fitting portion is reduced. Preventing outbreak (Shokaisho 6
No. 0-23328 and No. 61-206136.

[0003]

However, when the vibration of the rotary shaft or the brake disc is large, the spring force of the elastic member also becomes large and the sliding resistance of the brake disc becomes large. Therefore, the spring force of the compression coil spring causes the armature to move. Even if the armature is magnetically attracted to the field core and is separated from the brake disc, the brake disc pressed to the pressure receiving plate side via the is kept in contact with the pressure receiving plate. Therefore, the friction surface of the brake disc may be significantly worn or seized on the pressure receiving plate.
It caused practical problems. An object of the present invention is to solve the above problems and provide a practically excellent non-excitation actuated electromagnetic brake.

[0004]

A non-excitation actuated electromagnetic brake according to a first aspect of the present invention has a center hub in which a brake disc and an outer hub are spline-fitted to each other in a circumferential direction between opposing side faces of the brake disc and the outer hub. An elastic member is arranged in each space formed at intervals, and one end of the elastic member is brought into contact with the brake disc and the other end is brought into contact with the outer hub. Further, between the side surface of the brake disc and the side surface of the outer hub, a return member for moving the brake disc from the outer hub to the armature side is arranged, and a gap adjusting member for limiting the movement amount of the brake disc by the return member,
A slide resistance member is provided, which is fastened to the center hub and hooked to the outer hub by a fastening force that limits the movement of the outer hub toward the anti-armature side by the return member. Then, when the armature is magnetically attracted to the field core and separated from the brake disc, the brake disc is separated from the pressure receiving plate by the spring force of the returning member.

The non-excitation actuated electromagnetic brake of the second invention is
In the non-excitation actuated electromagnetic brake of the first aspect of the invention, a storage groove serving as a space portion is formed at one of the side surfaces of the brake disc and the outer hub at intervals in the circumferential direction, and the other is formed. A protrusion is formed on the side surface, the tip of which is individually inserted into the accommodation groove. One end of the elastic member disposed in the accommodation groove is brought into contact with the wall surface of the accommodation groove and the other end is brought into contact with the protrusion. It has a different structure. Then, an elastic member is arranged in the storage groove closed from the outside by the side surface of the brake disc and the side surface of the outer hub to prevent the elastic member from falling off.

The non-excitation actuated electromagnetic brake of the third invention is
In the non-excitation actuated electromagnetic brake of the first aspect of the present invention, a concave portion is formed at a circumferential interval on either one of the side surface of the brake disc and the side surface of the outer hub. The structure is such that a disc spring that is interposed between the disc springs and elastically deforms is arranged. The plate thickness of the brake disc or the outer hub in which the concave portion is formed is thin, and the outer hub does not protrude from the side surface of the pressure receiving plate on the side opposite the brake disc. Made it possible.

The non-excitation actuated electromagnetic brake of the fourth invention is
In the non-excitation actuated electromagnetic brake of the first invention, stepped through holes are formed in one of the brake disc and the outer hub at intervals in the circumferential direction, and the other is inserted into each stepped through hole. The screws as fixed gap adjustment members are fixed, and a gap smaller than the gap formed between the magnetic attraction surface of the field core and the armature is formed between the head of each screw and the bottom of the stepped through hole. It was made to be a structure. Then, the moving amount of the brake disc moving from the outer hub to the armature side is adjusted by the screwing depth of the screw to the brake disc or the outer hub.

The non-excitation actuated electromagnetic brake of the fifth invention is
In the non-excitation actuated electromagnetic brake of the first invention, a C-shaped ring as a sliding resistance member is tightened on the outer peripheral surface of the center hub, and the outer peripheral surface of the C-shaped ring is a hook formed on the inner peripheral surface of the outer hub. It has a structure that can be hooked in a groove. Then, the C-shaped ring was prevented from coming off due to vibration.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a non-excitation actuated electromagnetic brake according to the present invention will be described in detail with reference to the drawings of FIGS. 1 is a sectional view of a non-excitation actuated electromagnetic brake mounted on a motor as a braked machine, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. 4 is a plan view of the outer hub, FIG. 5 is a cross-sectional view taken along the line CC of FIG. 2, showing only the periphery of the gap adjusting member, and FIG. 6 is an explanatory view showing a developed cross-section of a main part.

The non-excitation actuated electromagnetic brake 2 mounted on the motor 1 has a magnetic attraction surface 3a on its side facing the motor 1 side.
The field core 3 is arranged. In the field core 3, an electromagnetic coil 4 fixed by an insulating resin is housed in an annular groove 3b opened on the side of the magnetic attraction surface 3a, and a position on the same circumference on the inner diameter side of the annular groove 3b is divided into four equal parts. Similarly, a spring hole 3c that opens toward the magnetic attraction surface 3a is formed in the. In addition, these annular groove 3b and spring hole 3c
An annular flange portion 3d extending outward in the radial direction is integrally formed on the outer peripheral surface on the bottom side of the, and a through hole formed at a position that divides the flange portion 3d into three in the circumferential direction will be described later. The end portion of the headless screw 5 which constitutes the guide means of the armature 11 is inserted. Each headless screw 5 is fixed to the flange portion 3d by a pair of nuts 6 screwed to the headless screw 5 and fastened to each side surface of the flange portion 3d.

The other end of each headless screw 5 is screwed into a screw hole 7a of an annular pressure receiving plate 7 as a fixing member which is arranged to face the magnetic attraction surface 3a of the field core 3 with a gap. It is fixed. As described above, the pressure receiving plate 7 supported by the field core 3 via the headless screw 5 has the screw hole 7a.
Similarly, is fixed to the motor 1 by a mounting screw 8 that is inserted from a through hole 7b formed at a position that divides the circumferential direction into three equal parts and screwed into a screw hole of the housing of the motor 1. That is, in this embodiment, the side surface 7c of the pressure receiving plate 7 on the side opposite to the field core 3 is connected to the non-excitation actuated electromagnetic brake 2
The mounting surface of the motor 1 is attached to the motor 1. The pressure receiving plate 7 may be omitted and the headless screw 5 may be directly screwed into the housing of the motor 1. However, when the housing is configured as a fixing member, the end surface of the outer hub 17 described later is In order to prevent abutting, it is necessary to form a concave shape from the center of the housing.

On the other hand, the headless screws 5 are individually fitted with collars 9 which form guide means together with them, and each collar 9 is fitted with a nut 10 screwed onto the headless screw 5 and a pressure receiving plate 7. Has been fixed between. In addition, each color 9
It is inserted into a through hole 11 a of the armature 11 interposed between the field core 3 and the pressure receiving plate 7. In this embodiment, the headless screw 5 and the collar 9 constitute the guide means of the armature 11. However, the headless screw 5 and the collar 9 may be integrally formed as an adjusting screw. Further, the headless screw 5 is used as a screw member only for supporting the pressure receiving plate 7 on the field core 3, and the pin implanted on the magnetic attraction surface 3 a of the field core 3 is attached to the armature 1.
It may be one guide means.

As described above, the armature 11 supported by the field core 3 through the collar 9 and the headless screw 5 is formed with the through hole 11a into which the collar 9 is inserted and which is formed at a position that divides the circumferential direction into three equal parts. Similarly, a compression coil as a braking member, which is formed with a notch portion 11b as a relief portion of the mounting screw 8 formed at a position equally dividing the circumferential direction into three, and is inserted into the spring hole 3c of the field core 3 The spring force of the spring 12 presses the pressure receiving plate 7 side through the brake disc 13. Further, the armature 11 is magnetically attracted to the magnetic attraction surface 3a of the field core 3 against the spring force of the compression coil spring 12 by the magnetic flux generated by energizing the electromagnetic coil 4. That is, armature 1
1 is supported by the field core 3 so that it can only move toward and away from the magnetic attraction surface 3a.

The brake disc 13 has a spline hole 13a at the center, and a noise reduction plate 14 is sandwiched between the friction plates 1 on both sides.
5 is fixed. Also, this brake disc 13
Is spline-fitted to a center hub 16 integrally mounted on the rotary shaft 1a of the motor 1 with a key 1b and a snap ring 1c. Similarly, a spline hole 17a that is spline-fitted to the center hub 16 is formed. Center hole 7
It is adapted to move toward and away from the outer hub 17 formed inside d.

As shown in the plan view of FIG. 4 showing the side surface of the pressure receiving plate 7 side which is aligned with the side surface of the brake disc 13, the annular outer hub 17 is provided with left and right sides with respect to a position dividing the circumferential direction into three equal parts. Notched grooves 17b that are opened in the radial direction are formed at positions that are deviated by an arbitrary angle, and concave storage grooves 17c that are opened toward the respective notched grooves 17b are formed. The storage groove 17c has a shape that is opened radially toward the rotation direction side of the rotary shaft 1a and extends radially. The deepest portion of the storage groove 17c is a planting pin with a thread groove that serves as a protrusion of the brake disc 13 described later. A through hole 17d through which 18 is inserted is formed. Reference numeral 17e is a stepped through hole into which a screw 21 having a head that serves as a gap adjusting member described later is inserted,
Reference numeral 17f is a recess for accommodating a disc spring 20 serving as a return member, which will be described later, and is formed at a position that divides the circumferential direction into three equal parts.

After inserting the planting pin 18 into the through hole 17d in each housing groove 17c of the outer hub 17 having such a shape, one end abuts on the planting pin 18 and the other end is notched. A compression coil spring 19 as an elastic member that is brought into contact with the wall surface of the groove 17b is housed. In addition, each recess 17
The disc spring 20 serving as a return member is housed in f (see FIGS. 3 and 6). The elastic member may be a columnar or prismatic damper rubber. Then, the mating surface side of the outer hub 7 faces the mating surface of the brake disc 13, and the threaded portion of the planting pin 18 is screwed into the screw hole 13 of the brake disc 13.
It is fixed by screwing on b. In addition, in the other screw hole 13c of the brake disc 13, the stepped through hole 1 of the outer hub 17
The disc spring 20 interposed between the brake disc 13 and the outer hub 17 is elastically deformed by screwing and fixing a screw 21 which is a gap adjusting member inserted from 7e.

The screw 21, which serves as a clearance adjusting member, has a collar 22 and a plain washer 23, as shown in the enlarged sectional view of FIG.
Is fastened to the screw hole 13c of the brake disc 13 in a state of being fitted to the outside, and the gap S set by the height of the collar 22 is the same as the bottom surface 17g of the stepped through hole 17e of the outer hub 7. It is formed between the flat washer 23. The gap S has a size smaller than the size of the air gap G formed in the non-excited state in which the electromagnetic coil 4 is de-energized, as indicated by the symbol G in FIG.

Although the notch groove 17b is formed on the outer hub 17, this is formed by machining for forming the housing groove 17c and can be omitted. Further, the screw 21 and the collar 2 serve as gap adjusting means.
2, the plain washer 23 is provided, but a fixing screw having a shape in which these are integrally formed may be arranged as the gap adjusting member.

The brake disc 13 and the outer hub 17 assembled in this manner have a C-shaped ring 24 as a sliding resistance member whose outer peripheral surface is locked in a locking groove 17h formed in the inner peripheral surface of the outer hub 17. In the unfolded state, it is spline-fitted to the spline teeth 16a of the center hub 16. The C-shaped ring 24 after being fitted is the disc spring 2 in FIG.
The outer hub 17 is not moved to the motor 1 side by the spring force of 0, and the spline teeth 16a of the center hub 16 are tightened with a tightening force.
Tightened in pieces. The tightening force of the C-shaped ring 24 is set to a value smaller than the spring force of the compression coil spring 12.

In the non-excitation actuated electromagnetic brake 2 having the above-described structure, when the motor 1 is stopped, the brake disk 13 is provided between the armature 11 and the pressure receiving plate 7 by the spring force of the compression coil spring 12. Since it is in a braking state sandwiched by the rotary shaft 1a, the rotary shaft 1a of the motor 1 is held stationary. When the electromagnetic coil 4 is energized to generate a magnetic flux in this braking state, the armature 11 resists the spring force of the compression coil spring 12 and the magnetic attraction surface 3 a of the field core 3.
Since the brake disc 13 is released from the braking force, the rotating shaft 1a becomes rotatable, and the brake disc 13 is separated from the pressure receiving plate 7 by the spring force of the disc spring 20.

Further, the brake disc 13 and the outer hub 17, which are spline-fitted to the center hub 16, are urged to the opposite sides in the circumferential direction by the spring force of the compression coil spring 19, and the spline teeth of these members are splined. Is displaced until it comes into contact with the tooth flanks of the spline teeth 16a of the center hub 16, so it is possible to prevent generation of unpleasant noise due to backlash of the spline fitting portion.

The non-excitation actuated electromagnetic brake 2 of the embodiment has a compression coil spring 19 between the wall surface of the housing groove 17c of the outer hub 17 and the stud pin 18 whose tip is inserted into the housing groove 17c. Although the structure is arranged, the structure in which the compression coil spring 19 is arranged on the brake disc 13 side can be changed. Similarly, the disc spring 20 and the screw 2
It is possible to change the structure in which 1 is arranged on the brake disc side. Furthermore, the compression coil spring 12 arranged as a braking member is arranged on the headless screw 5 side, or the motor 1
The detailed structure can be changed such that the attachment surface to the side surface of the flange portion 3d of the field core 3 is used.

[0023]

The non-excitation actuated electromagnetic brake of the present invention includes a return member for moving the brake disc to the armature side, a gap adjusting member for limiting the amount of movement of the brake disc by the return member, and an outer hub for the outer hub. Since the sliding resistance member that restricts the movement to the anti-armature side is provided, the sliding force of the brake disk increases due to the spring force of the elastic member that urges the brake disk and the outer hub to the opposite sides in the circumferential direction. However, the brake disc can be separated from the fixed member by the return member having a spring force equal to or larger than the sliding resistance force. Therefore, it is possible to prevent the generation of unpleasant noise due to the backlash of the spline fitting portion, and it is possible to solve the problems that the friction surface of the brake disc is significantly worn or seized on the fixing member, which is excellent in practical use. A non-excitation actuated electromagnetic brake can be provided.

Further, since the space for arranging the elastic member is formed between the side surface of the brake disc and the side surface of the outer hub which face each other, the frame for selecting the spring force of the elastic member arranged in this space portion is widened, and the size is reduced. It can be applied to many non-excitation actuated electromagnetic brakes from small to large.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view of an outer hub.

5 is a cross-sectional view taken along the line CC of FIG. 2, showing only the periphery of the gap adjusting member.

FIG. 6 is an explanatory view showing a developed cross section of a main part.

[Explanation of symbols]

3 ... Field core, 4 ... Electromagnetic coil, 7 ... Pressure receiving plate as fixing member, 11 ... Armature, 12 ... Compression coil spring as braking member, 13 ... Brake disc, 16
... center hub, 17 ... outer hub, 19 ... compression coil spring as elastic member, 20 ... disc spring as returning member,
21 ... A screw as a gap adjusting member, 24 ... A C-shaped ring as a sliding resistance member.

Claims (5)

[Claims] 1. A field core in which an electromagnetic coil is housed in an annular groove open to a magnetic attraction surface, a fixing member which is arranged to face the magnetic attraction surface and is supported by the field core, and these field cores. And a fixing member interposed between the armature and the fixing member, the armature being supported by the field core so as to move toward and away from the magnetic attraction surface, and a brake disc rotatably interposed between the armature and the fixing member. And a non-excitation actuated electromagnetic brake including a braking member that presses the armature toward the fixing member, spline teeth that are fitted in a spline hole formed in the center of the brake disc are formed on the outer peripheral surface. A center hub, and a side surface that is spline-fitted to the center hub and is aligned with the side surface of the brake disc on the fixed member side. An outer hub provided with a plurality of space portions circumferentially spaced between the side surface of the brake disc and the side surface of the outer hub facing each other, and the plurality of space portions individually arranged in the space portion in the circumferential direction. A plurality of elastic members, one end of which is in contact with the brake disc and the other end of which is in contact with the outer hub, and a return member that moves the brake disc from the center hub to the armature side against the elastic force of the elastic members. A member, a gap adjusting member that limits the amount of movement of the brake disc by the return member, and a tightening force that limits the movement of the outer hub toward the side opposite to the armature by the return member. A non-excitation actuated electromagnetic brake, characterized in that it is provided with a sliding resistance member. 2. A plurality of storage grooves, which serve as the space, are formed at intervals in the circumferential direction on one of the side surfaces of the brake disc and the outer hub, and the other side surface is formed. Is formed with a plurality of protrusions each having a tip individually inserted into the storage groove, and one end in the circumferential direction of the elastic member individually arranged in the storage groove is brought into contact with the wall surface of the storage groove. The non-excitation actuated electromagnetic brake according to claim 1, wherein the other end is in contact with the protrusion. 3. A plurality of recesses are formed at intervals in the circumferential direction on one of the side surfaces of the brake disc and the outer hub, and the recesses are interposed between the side surfaces to prevent elastic deformation. The non-excitation actuated electromagnetic brake according to claim 1, wherein disc springs serving as the return member are individually arranged in the recess. 4. A plurality of stepped through holes are formed at intervals in the circumferential direction on one of the brake disc and the outer hub, and the other is inserted into each of the stepped through holes. A plurality of screws as gap adjusting members are fixed, and are smaller than the gap formed between the magnetic attraction surface of the field core and the armature between the head of each screw and the bottom surface of the stepped through hole. The non-excitation actuated electromagnetic brake according to claim 1, wherein a gap is formed. 5. A C-shaped ring as the sliding resistance member is tightened on the outer peripheral surface of the center hub, and the outer peripheral surface of the C-shaped ring is locked in a locking groove formed on the inner peripheral surface of the outer hub. The non-excitation actuated electromagnetic brake according to claim 1, wherein