JP2002181090A - Disc brake - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a disc brake that can secure a braking force of 50% or more of a normal state when a disc is in a hard condition, has a simple structure, and is easy to manufacture and maintain. SOLUTION: A joint for transmitting the circumferential force of the discs 6 and 8 to a rotating shaft 12 and allowing the disc 8 to move along the axial direction, and transmitting the circumferential force of the disc 6 to the disc 8 and A disk 6 along the axial direction,
And connection means for allowing relative movement between the two. Thus, when the disk 6 is hard, the respective surfaces of the disks 6 and 8 (two sets of sliding contact surfaces) are in sliding contact with each other, and when the disk 8 is hard, both surfaces of the disk 6 and one surface of the disk 8 (total). The three sets of sliding surfaces are in sliding contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for use in braking a drive mechanism, and more particularly to a disc brake suitable for use in an elevator hoist.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 4-19924, one disk fixed to a rotating shaft of a motor is connected to the rotating shaft via a spline, and the shaft is connected to the rotating shaft. There has been proposed a disc brake having another disc which can be moved to the disc and a hydraulic piston provided on each of these discs. In this conventional disc brake, when the piston is operated using hydraulic pressure, the disc is pushed by the piston and moves in the axial direction while the disc connected by the spline moves in the axial direction, and the intermediate plate moves until it hits the fixed-side disc, and the braking force is increased. Occurs. At this time, the force of one piston is balanced with the force of the other piston, and the entire brake device is moved to the anti-motor side with reference to the position of the fixed-side disk, and a so-called floating structure is used. ing. Then, for example, in the case where there is hard traffic due to the spline, a braking force is generated on one surface of the fixed disk (one surface on the piston side) and one surface of the other disk (one surface on the piston side). % Braking force can be secured.

As described in, for example, Japanese Patent Application Laid-Open No. 4-75410, the above-mentioned Japanese Utility Model Laid-Open No. 4-19924.
There has also been proposed a disc brake in which a piston similar to the piston proposed in Japanese Patent Application Laid-Open Publication No. H10-20711 has the same effect on one side. Even with this conventional disc brake, when the spline is hard, a braking force is generated on one side of each of the fixed disc and the other disc.
Again, 50% braking power can be secured in the absence of heavy traffic.

[0004]

In the above-mentioned prior art, one of the two disks is fixed.
Since the entire brake device needs to have a so-called floating structure that moves in the axial direction of the rotating shaft (guide rod direction) during the braking operation, a support mechanism that guides the entire device in this moving direction and can withstand the brake reaction force is provided. Required. As a result, there is a problem that the mechanism and the operation become complicated, the production and maintenance and inspection are troublesome, and the product cost is increased.

[0005] The above-mentioned prior art relates to a brake device using hydraulic pressure. If the brake device is applied to an electromagnetic disc brake, for example, when used in an elevator hoist, ordinary elevator equipment,
That is, in addition to the electric control device for controlling the driving of the car, etc., a hydraulic pressure generating device for driving the disc brake and a hydraulic pressure generating device for generating a hydraulic pressure in accordance with an electric signal output from the above electric control device are provided. It requires a separate electric-to-hydraulic converter to be driven, and has a two-system driving and braking mechanism for electric and hydraulic pressure, which further increases the manufacturing and maintenance work and increases the product cost. . Further, since the machine room of the elevator is small, there is also a problem that it is difficult to secure an installation space for the hydraulic pressure generating equipment in the machine room.

The present invention has been made in view of such a situation in the prior art, and its object is to secure a braking force of 50% or more of a normal state when the disc is in a tight state, and to have a simple structure. Another object of the present invention is to provide a disc brake that is easy to manufacture and maintain, and that can reduce costs.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a core through which a rotating shaft of a motor is penetrated, an electromagnetic coil provided on the core, and a rotating shaft having one end attached to the core. A plurality of guide rods extending in the axial direction of the armature, an armature inserted through these guiderods and provided movably along the guiderods, and the armature interposed between the armature and the core, and the armature being attached to the core. A spring body that urges away from the end plate, an end plate that is inserted into the distal end of the guide rod, and an end plate that is provided between the end plate and the amateur.
An intermediate plate that is inserted into the guide rod and is provided movably along the guide rod; a first disk and a second disk interposed between the intermediate plate and the amateur, and between the intermediate plate and the end plate, respectively; And a joint for transmitting the circumferential force of these disks to the rotary shaft at the inner diameter portion and allowing the disk to move along the axial direction of the rotary shaft. Of the first disk and the second disk along the axial direction of the rotating shaft.
And a connecting means for allowing relative movement between the disks.

In the present invention having the above-described structure, when the electromagnetic coil is not energized, the armature urges the first disk, the intermediate plate, the second disk, and the end plate away from the prime mover by the urging force of the spring body. So
A total of four sets of rubbing surfaces on both sides of the first disk and on both sides of the second disk rub against each other to generate a braking force. At this time, relative movement between these disks along the axial direction of the rotating shaft is allowed by the coupling means, and the circumferential force of the first disk is transmitted to the second disk. In addition, movement of the second disk along the axial direction of the rotating shaft is permitted by the joint, and the braking force of both of these disks is transmitted from the second disk to the rotating shaft. On the other hand, when the electromagnetic coil is energized, the armature is attracted to the core by overcoming the urging force of the spring body.
The force for pressing the disc, the intermediate plate, the second disc, and the end plate is lost, and a gap is formed on both sides of each of the first disc and the second disc, so that the braking force is lost.

In the case where the above-mentioned first disk and the second disk are tightly connected and the second disk and the rotating shaft are not tightly connected, one side of the first disk (the surface on the amateur side)
And one surface of the second disk (the surface on the end plate side)
Since the braking force is generated by sliding only on the two sets of sliding surfaces, a braking force of 50% of the normal state can be secured. On the contrary, the first disc and the second disc are not stuck,
If the second disc and the rotating shaft are firmly contacted, a braking force is generated on a total of three sets of sliding contact surfaces of both sides of the first disc and one side of the second disc (the surface on the intermediate plate side). 75% of the normal braking force can be secured.

[0010] This makes it possible to secure a braking force of 50% or more of the normal state when the disk is hard, and the structure is simple because no complicated floating mechanism or hydraulic device is required, and the production, maintenance and inspection are easy. Therefore, the cost can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disc brake according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a disc brake according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the disc brake of FIG. 1 taken along line AA, and FIG. FIG. 4 is a cross-sectional view showing a state in which the disk is hard, and FIG. 4 is a cross-sectional view showing a state in which the second disk provided in the present embodiment is hard.

The disc brake of the present embodiment is shown in FIG.
As shown in FIG. 2, the motor 13 serving as a prime mover is arranged coaxially with the rotating shaft 12, and a bolt 1 is attached to an end face of the motor 13.
6, an electromagnetic coil 2 buried on one side (right side in FIG. 2) of the core 1 and fixed with screws (not shown), one end of which is press-fitted into the core 1, A plurality of guide rods 3 extending in the axial direction, and an armature 5, a first disk 6, an intermediate plate 7, a second disk 8, and an end plate which are sequentially arranged on one side of the core 1 and inserted through the guide rods 3, respectively. 9 and a retaining nut 10 which is screwed to the tip of the guide rod 3 and abuts on the end plate 9, and is provided on one side of the core 1, and attaches the armature 5 in a direction away from the core 1 (right side in FIG. 2). A plurality of biasing spring bodies, for example, a compression coil spring 4 are provided.

A rotating shaft 12 is provided on the inner diameter of the first disk 6.
A spline 14 is formed on the outer diameter of the boss 8a of the second disk 8, and another spline 14a that engages with the spline 14 is formed on the outer diameter of the boss 8a.
The spline hub 11 is press-fitted into the boss 8a, and a spline 15 that meshes with the spline hub 11 is formed in the inner diameter portion of the boss 8a of the second disk 8. As a result, the first disk 6 and the second disk 8
The rotary shaft 12 is mounted concentrically with the rotary shaft 12 via 4, 14a, and 15 to be movable in the axial direction of the rotary shaft 12. In addition, amateur 5, intermediate plate 7, end plate 9
Are fitted to the guide rods 3 (scratch),
It is movable along the guide rod 3.

In the disk brake of this embodiment, when the electromagnetic coil 2 is not energized as shown in FIG.
The armature 5 is biased by the spring 4 so that the armature 5
Since the intermediate plate 7, the second disk 8, and the end plate 9 are urged toward the opposite side of the motor 13, both surfaces of the first disk 6 and the armature 5 and the intermediate plate 7 are rubbed, and the second disk 8 The intermediate plate 7 and the end plate 9 rub against each other, so that a total of four sliding contact surfaces generate a circumferential braking force,
This braking force is transmitted to the rotating shaft 12 via the splines 14, 14a and 15. On the other hand, when the electromagnetic coil 2 is energized, the armature 5 is overcome by the biasing force of the spring body 4 and the armature 5 is attracted to the core 1, so that the first disk 6, the intermediate plate 7, the second disk 8, and the end plate 9 Since there is no longer any force to press the discs, gaps are formed on both sides of the discs 6 and 8, so that the braking force described above disappears.

As shown in FIG. 3, when the splines 14, 14a of the disks 6, 8 are tight and the spline 15 of the second disk 8 is normal (when there is no hard), the first
In the circumferential direction, only two sets of sliding contact surfaces, one surface of the disc 6 on the amateur 5 side (left side in FIG. 3) and the other surface of the second disk 8 on the end plate 9 side (right side in FIG. 3), are used. Since a braking force is generated, a braking force of 50% of a normal state can be secured.

If the splines 14 and 14a of the disks 6 and 8 are normal and the spline 15 of the second disk 8 is tight as shown in FIG.
The braking force is generated on a total of three sets of sliding contact surfaces of both surfaces of the second disk 8 and one surface of the second disk 8 on the side of the armature 5 (the left side in FIG. 4), so that 75% of the braking force in a normal state can be secured.

In this embodiment having such a configuration, when the discs 6 and 8 are in hard traffic, a braking force of 50% or more of a normal state can be secured, and since no hydraulic device is required, the structure is simple and the installation space is small. As well as production,
Maintenance and inspection are easy and costs can be reduced.

In this embodiment, the core 1 is connected to the motor 1
By fixing to 3, there is no need to adopt a floating structure for displacing the entire apparatus in the direction of the rotation axis, so that the structure is also simple from this point, and it is advantageous because the number of manufacturing steps and maintenance and inspection are reduced.

In the above embodiment, the spline 14 formed at the inner diameter of the first disk 6 and the spline 1 formed at the outer diameter of the boss 8a of the second disk 8 are used.
4a, the circumferential force of the first disk 6 is
Connecting means for transmitting relative movement between the disks 6 and 8 along the direction in which the guide rod 3 extends, and a boss 8a of the second disk 8
Spline 15 provided on the inner diameter portion and rotating shaft 12
The disc 6, the spline hub 11 pressed into the
A joint that transmits the circumferential force of No. 8 to the rotary shaft 12 at the inner diameter portion and allows the movement of the second disk 8 along the axial direction of the rotary shaft 12 is configured.

[0021]

As described above, according to the present invention, it is possible to secure a braking force of 50% or more of the normal state when the disk is hard, and to simplify the structure because a complicated floating mechanism and hydraulic pressure are not required. In addition, it is possible to provide a disc brake which is easy to manufacture and maintain, and inexpensive.

[Brief description of the drawings]

FIG. 1 is a front view of a disc brake according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the disc brake of FIG. 1 taken along line AA.

FIG. 3 is a cross-sectional view showing a state where a first disk provided in the present embodiment is tight.

FIG. 4 is a cross-sectional view showing a state in which a second disk provided in the present embodiment is tight.

[Explanation of symbols]

1 ... core, 2 ... electromagnetic coil, 3 ... guide rod,
4 ... compression coil spring (spring body), 5 ... amateur,
6 first disc, 7 intermediate plate, 8 second disc, 8a boss, 9 end plate,
11 ... spline hub, 12 ... rotating shaft, 13 ... motor (motor), 14, 14a ... spline (connecting means), 15 ... spline.

Claims (2)

[Claims] 1. A core through which a rotating shaft of a prime mover penetrates, an electromagnetic coil provided on the core, a plurality of guide rods having one end attached to the core and extending in the axial direction of the rotating shaft, An armature inserted through these guide rods and provided movably along the guide rods; a spring interposed between the armatures and the core to bias the armatures away from the cores; An end plate that is inserted into the distal end portion, an intermediate plate that is provided between the end plate and the armature, and that is inserted into the guide rod and movably provided along the guide rod, between the intermediate plate and the amateur, And a first disk and a second disk interposed between the intermediate plate and the end plate, respectively. And a joint for transmitting the circumferential force of these discs to the rotating shaft at the inner diameter portion and allowing the disc to move along the axial direction of the rotating shaft. Coupling means for transmitting a circumferential force to the second disk and allowing relative movement between the first disk and the second disk along the axial direction of the rotating shaft; Disc brake. 2. The connecting means comprises a spline formed on an inner diameter portion of the first disk, and a spline engaged with the spline and formed on an outer diameter portion of a boss of the second disk. 2. The disc brake according to claim 1, wherein: