JP2002130339A - Non-excitation actuated type electromagnetic brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible an easy separation of a hub from an armature at the time of non-electrification, in a non-excitation actuated type electromagnetic brake provided with a permanent magnet. SOLUTION: Each hexagon nut 16 is admitted in each nut receiver hole 17 arranged in the armature 4 opposite the hub 2 anti-rotationally and slidably along the axial direction, and each hexagon socket head bolt attached from outside of the hub 2 is engaged threadedly to the hexagon nut through a flat spring 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excited electromagnetic brake having a permanent magnet and a brake applied to a driven shaft when not energized.

[0002]

2. Description of the Related Art Prior art will be described with reference to the drawings of embodiments of the present invention. FIG. 8 illustrates a non-excited operation type electromagnetic brake including a permanent magnet (hereinafter, simply referred to as “electromagnetic brake”). First, the configuration of the electromagnetic brake B 'will be described. The shaft 1 as a driven shaft and the hub 2 are integrally attached by a key 3. An armature 4 and a magnetic pole body 5 are provided on the shaft 1 on the side of the hub 2 in this order. This armature 4 is an armature body 4
A ring-shaped magnetic path forming body 4b is fitted to the outside of the armature a through a ring-shaped permanent magnet 6, and an annular ring serving as a magnetic resistance is provided between the armature body 4a and the magnetic path forming body 4b. A space 7 is formed. The magnetic pole body 5 has substantially the same outer diameter as the armature 4 and is held in a fixed state on a frame F. A surface facing the armature 4 has a circumferential surface extending along the circumferential direction. An electromagnetic coil 8 wound in multiple turns is provided inside.

The hub 2 and the armature 4 are connected by a plurality of arc-shaped leaf springs 9 (FIG. 3).
reference). That is, one end of each leaf spring 9 is connected to the armature 4.
Are fixed in a state of being in contact with the hub 2 by the respective mounting screws 11 inserted from the side of the armature. Similarly, the other end is in contact with the armature 4 by a rivet 12 driven from the side of the hub 2. It is fixed in the state where it was. The armature 4 is moved by the elastic restoring force of each of the leaf springs 9.
It is always pulled toward the hub 2. In FIG. 8, reference numeral 13 denotes each of the mounting screws 1 in the armature 4.
Reference numeral 14 denotes an escape hole for accommodating the head of the rivet 12, and reference numeral 14 denotes an escape hole for accommodating the head of the rivet 12 in the hub 2.

Next, the operation of the electromagnetic brake B 'will be described. As shown in FIG. 9, the electromagnetic brake B '
When the electromagnetic coil 8 is energized, the magnetic pole body 5 is magnetized by the excitation of the electromagnetic coil 8, and a magnetic flux φ _{2 in the} opposite direction to the magnetic flux φ ₁ of the permanent magnet 6 contained in the armature 4 is formed around the electromagnetic coil 8. Is done. As a result, the same magnetic poles are formed facing each other at the position where the armature 4 and the magnetic pole body 5 are opposed to each other.
No braking force is applied to.

In the energized state of the electromagnetic brake B ′, when the application of the voltage is released (the current is cut off), the magnetic flux φ ₂ on the side of the magnetic pole body 5 disappears, and as shown in FIG. Against the elastic restoring force of the leaf spring 9,
By the action of the permanent magnet 6 of the magnetic pole, the magnetic pole is magnetically attracted to the magnetic pole body 5 side. As a result, the hub 2 becomes the armature 4
And, it is integrally connected to the magnetic pole body 5 through the leaf spring 9, and a braking force acts on the shaft 1. When the power is not supplied, the annular space 7 provided in the armature 4 serves as a magnetic resistance. Therefore, most of the magnetic flux φ ₁ ′ of the permanent magnet 6 does not pass through the annular space 7, It passes around the electromagnetic coil 8.

When a voltage is applied to the electromagnetic coil 8 in a non-energized state, a magnetic flux φ ₂ ′ is formed around the electromagnetic coil 8 in a direction opposite to the magnetic flux φ ₁ ′ of the permanent magnet 6. two momentarily reverse the same magnetic path around the magnetic flux φ ₁ ', φ _2' supposed to exist, both the magnetic flux phi ₁ ', phi
₂ 'offset each other. As a result, the magnetic flux φ ₁ ′ of the permanent magnet 6 does not reach the magnetic pole body 5, and the armature 4 magnetically attracted to the magnetic pole body 5 is separated by the elastic restoring force of the leaf spring 9. As a result, a state in which no braking force acts on the shaft 1 is achieved.

For example, there is a case where it is desired to separate the hub 2 from the armature 4 for replacing each leaf spring 9 or for maintenance and inspection. In such a case, the operation is performed with the electromagnetic brake B ′ de-energized. Then, the armature 4 and the magnetic pole body 5 are magnetically attracted. For this reason, it is extremely difficult to loosen the mounting screws 11 connecting the hub 2 and the leaf springs 9 from the armature 4 side.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a non-excited operation type electromagnetic brake provided with a permanent magnet, it is possible to easily separate a hub from an armature when power is not supplied. That is the task.

[0009]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems comprises a magnetic pole body fixed to a frame or the like with an electromagnetic coil mounted therein and mounted on a driven shaft, and a permanent magnet mounted therein. An armature facing the magnetic pole body and movably mounted on the driven shaft, and integrally attached to the driven shaft, and further, on the opposite side of the armature from the magnetic pole body, via the armature and the leaf spring. A hub connected to the armature, and when not energized, the armature is magnetically attracted to the magnetic pole body by the action of the permanent magnet against the elastic restoring force of the leaf spring, and a braking force is applied to the driven shaft. A non-excited operation type electromagnetic brake, wherein the means for fixing the leaf spring and the hub can be tightened and released from a side of the hub opposite to the armature.

In the case of the first aspect of the present invention, the magnetic flux of the electromagnetic coil housed in the magnetic pole body disappears when the power is not supplied.
For this reason, the armature is magnetically attracted to the magnetic pole body by the action of the permanent magnet contained in the armature,
A braking force acts on the driven shaft. In this state, when the operator separates the hub from the armature, the fixing between the leaf spring and the hub is released. Both fixing means can be released from the opposite side of the hub from the armature. As a result, the hub can be easily separated from the armature even when power is not supplied. In addition, the above operation can be performed while the magnetic pole body and the armature are magnetically attracted, that is, while the concentricity of both is maintained. Therefore, when assembling the separated hub, it is only necessary to attach the hub as it is. Also in this case, the fixing means between the leaf spring and the hub can be tightened from the side of the hub opposite to the armature, so that the operation is easy.

[0011] The invention described in claim 2 is based on the invention described in claim 1, wherein the fixing means includes: a bolt housed in a bolt hole of the hub from a side of the hub opposite to the armature; A nut screwed into the bolt and housed in the recess provided on the side of the armature facing the hub in a detented state. In this case, the operator need only loosen and remove the bolt from the opposite side of the hub from the armature.

Further, the invention described in claim 3 is the first invention.
The fixing means is housed in a depressed portion provided on the side of the armature facing the hub in a non-rotating state, and the screw portion protrudes on the side of the hub opposite to the armature. It is composed of a bolt and a nut that is screwed into the screw portion. In this case, the operator only needs to loosen the nut screwed on the opposite side of the hub from the armature.

The invention described in claim 4 is the invention according to claim 2 or 3.
Assuming the invention described in the above, the detent means,
A detent pin mounted on the inner wall surface of the recess along the axial direction of the driven shaft. In this case, there is an advantage that the configuration becomes extremely simple.

In the case of the invention described in claim 5, the leaf spring and the armature are fixed by bolts, and a through hole is provided in a portion of the hub corresponding to the bolt. When the hub is separated from the armature when power is not supplied, the operator only has to loosen the bolts through the through holes provided in the hub, so that the operation is easy. In this case, the hub is separated from the armature integrally with the leaf spring.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples. Note that the same portions as those described in the section of "Prior Art" are denoted by the same reference numerals, and only the portions according to the present invention will be described in detail, avoiding redundant description. Figure 1 is a front cross-sectional view at the time of energization of the electromagnetic brake B ₁ of the first embodiment of the present invention, FIG 2 is also an enlarged sectional view of a main portion, FIG. 3 is sectional view taken along line X-X of FIG. 1, FIG. 4 it is a front sectional view of the electromagnetic brake B ₁ in the non-energized. As shown in FIG. 1, the electromagnetic brake B according to the first embodiment of the present invention
Reference numeral ₁ denotes a magnetic pole body 5 which is externally mounted on a shaft 1 which is a driven shaft, and in which an electromagnetic coil 8 is mounted, and in which a permanent magnet 6 is similarly mounted.
An armature 4 mounted opposite the pole body 5
And the armature 4 is integrally attached to the shaft 1, and the armature 4
And a hub 2 connected via a leaf spring 9.
When the electromagnetic brake B ₁ is energized, as shown in FIG. 9, a magnetic flux φ ₁ is formed by the permanent magnet 6 housed in the armature 4 and the electromagnetic coil 8 housed in the magnetic pole body 5 the flux phi ₂ of the magnetic flux phi ₁ and opposite direction is formed. Therefore, the armature 4 and the magnetic pole body 5 are repelled, and are held in a state where a predetermined gap e is formed between them. As a result, the shaft 1 is rotatable. Further, at the time of non-energization, as shown in FIG. 10, the magnetic flux φ ₁ of the permanent magnet 6 housed in the armature 4 reaches the magnetic pole body 5, and the armature 4 is magnetically attracted to the magnetic pole body 5, 1 cannot rotate.
That is, a braking force is applied to the shaft 1.

As shown in FIG. 1 to FIG.
And the armature 4 are mounted on the same circumference at equal intervals along the circumferential direction.
) Are connected by an arc-shaped leaf spring 9. At one end of each leaf spring 9, a mounting screw (hexagon socket bolt 15)
A rivet insertion hole 9b through which the rivet 12 is inserted is provided at the other end similarly.

In the armature 4, each leaf spring 9
Each nut receiving hole 17 for receiving a nut member (hex nut 16) to be screwed with each hexagon socket head bolt 15 is provided at a position corresponding to the bolt insertion hole 9 a along the axial direction of the shaft 1. Is provided. Each nut receiving hole 17 is
The armature 4 is provided on the facing surface of the hub 2 with a bottom, and has an inner diameter slightly larger than a diagonal distance of the hexagon nut 16. As shown in FIGS. 1 to 3, a detent pin 18 is attached to the inner wall surface of each nut receiving hole 17 along the axial direction of the shaft 1. Each of the hexagon nuts 16 is accommodated in each of the nut accommodating holes 17 such that one of the outer surface portions faces the rotation preventing pin 18. As a result, each hexagon nut 16 is accommodated in each nut accommodation hole 17 in a non-rotating state, and is slidable along the axial direction of the shaft 1.

In the hub 2, each hexagon socket head cap screw 15 is provided at a position corresponding to each nut accommodating hole 17 of the armature 4 on the outside of the hub 2 (the armature 4).
A bolt insertion hole 2a for insertion from the side opposite to). From the outside of the hub 2, the bolt insertion hole 2a
Each of the hexagonal bolts 15 inserted into the nuts is screwed with a hexagonal nut 16 accommodated in each nut accommodation hole 17 through the bolt insertion hole 9a of each leaf spring 9. Each hexagon nut 1
6 is accommodated in a detent state by a detent pin 18. For this reason, when each hexagon socket head bolt 15 is tightened, each hexagon nut 16 is slid along the axial direction of the shaft 1, and one end of the leaf spring 9 is fixed in contact with the hub 2. .

Similarly, the rivet 12 inserted into the rivet insertion hole 9b provided at the other end of each leaf spring 9 is
The armature 4 is driven into the facing surface of the hub 2. For this reason, the other end of each leaf spring 9 is connected to the armature 4.
Is fixed in contact with As a result, the four leaf springs 9 are attached between the hub 2 and the armature 4 at equal intervals along the circumferential direction on the same circumference, and the respective leaf springs 9 connect the hub 2 and the armature 4 to each other. Are linked. In FIG. 2, reference numeral 19 denotes a washer.

The electromagnetic brake B of the first embodiment₁The effect of
Will be described. This electromagnetic brake B ₁Place to assemble
First, the magnetic pole body 5 is sheathed on the shaft 1 and
A. Subsequently, each leaf spring 9 is attached to the armature 4.
Are fixed by rivets 12, and then the hub 2 and each of the plates
The spring 9 is fixed with a hexagon socket head bolt 15. Previous
A hexagon nut 16 screwed with the hexagon socket head bolt 15 is
Each nut accommodating hole 17 provided in the armature 4 is
It is housed in a detented state by the detent pin 18.
Each hexagon from the opposite side of the armature 4 in the hub 2
It is only necessary to tighten the bolts 15 with holes. Like this
Then, the hub 2 and the armature 4 are connected via each leaf spring 9.
And attach it to the shaft 1.

As shown in FIG. 1, the electromagnetic brake B ₁
When the armature 4 is energized, the armature 4 and the magnetic pole body 5 are repelled (see FIG. 9), so that the armature 4 is pressed against the hub 2 by the elastic restoring force of each leaf spring 9, and the armature 4 and the magnetic pole body 5 A gap e is formed between them. Therefore, the shaft 1 can rotate integrally with the hub 2 and the armature 4.

Further, as shown in FIG. 4, when not energized the electromagnetic brake B ₁ represents a magnetic flux φ of the electromagnetic coil 8
_Since no magnetic flux ₂ is formed, the magnetic flux φ ₁ ′ of the permanent magnet 6 spreads over the magnetic pole body 5 (see FIG. 10), and the armature 4 is magnetically attracted to the magnetic pole body 5 against the elastic restoring force of each leaf spring 9. . That is, the armature 4 moves along the axial direction of the shaft 1. Accordingly, each leaf spring 9 is elastically deformed. The state is schematically shown in FIG.

At this time, each hexagon nut 16 accommodated in each nut accommodation hole 17 of the armature 4 is slid relative to the armature 4 along the axial direction of the shaft 1. At this time, one end of each leaf spring 9 remains fixed to the hub 2, and the connection state between the hub 2 and the armature 4 is maintained. As a result, a braking force acts on the shaft 1 via the armature 4, the leaf springs 9 and the hub 2, and the shaft 1 cannot rotate. The gap e between the armature 4 and the magnetic pole body 5 during energization is small. Even when both are magnetically attracted during non-energization, the hexagon nuts 16 do not come out of the nut receiving holes 17.

In this state, in order to separate the hub 2 from the armature 4, the hexagon socket head bolts 15 fixing the leaf springs 9 and the hub 2 are loosened and removed. That is,
As shown in FIG. 5, the worker loosens each hexagon socket head bolt 15 from the outside of the hub 2. On the outside of the hub 2,
There is a space large enough to perform the operation of loosening each hexagon socket head bolt 15. Moreover, each hexagon nut 16 accommodated in each nut accommodation hole 17 of the armature 4 is
Since each detent pin 18 is held in a detented state, each hexagon socket head bolt 15 can be easily loosened. As each hexagon socket head bolt 15 is loosened, one end of each leaf spring 9 is pressed against the armature 4 by its own elastic restoring force, and each nut receiving hole 1
7 is closed. For this reason, each hexagon nut 16 accommodated in each nut accommodation hole 17 does not fall off. When all the hexagon socket head bolts 15 are removed, the connection between the hub 2 and the armature 4 is released, and the hub 2 can be separated.

During the operation described above, the armature 4 and the magnetic pole body 5 remain magnetically attracted. For this reason, the concentricity of both does not deviate, and the work of adjusting the concentricity of the armature 4 and the magnetic pole body 5 when the hub 2 is reassembled becomes unnecessary, and the work efficiency is improved.

Next, an electromagnetic brake B2 of a _second embodiment will be described. The electromagnetic brake B ₂ of this embodiment is
Similar to the electromagnetic brake B ₁ embodiment, the facing surface of the hub 2 in the armature 4, at regular intervals along the circumferential direction on the same circumference, each bolt receiving holes 21 are provided. The heads of the hexagonal bolts 22 are accommodated in the respective bolt accommodation holes 21. Hex bolt 22
Are housed in the inner wall portion of each bolt housing hole 21 in a detented state by a detent pin 23 attached along the axial direction of the shaft 1. The screw portion of each hexagonal bolt 22 is connected to a bolt insertion hole 9 provided at one end of each leaf spring 9.
a, protruding from the outer surface of the hub 2 through a bolt insertion hole 2a provided in the hub 2 corresponding to each bolt accommodation hole 21, and is screwed with a hexagon nut 24.
In this embodiment, in order to separate the hub 2 from the armature 4, it is only necessary to loosen and remove each hex nut 24.

A description will now be given of the electromagnetic brake B ₃ (Example of the invention described in claim 5) Third Embodiment. Electromagnetic brake B ₃ in this embodiment, the plate springs 9, the rivet 12 without a case which is fixed to the armature 4 by hexagon socket head cap screws 25. A portion of the hub 2 corresponding to the hexagon socket head bolt 25 is provided with the bolt 25
Is provided from the outside of the hub 2 (the side opposite to the armature 4). The operator can tighten or loosen the hexagon socket head cap bolt 25 through the through hole 26. In the case of this embodiment, the hub 2 is separated integrally with each leaf spring 9.

[0028]

The non-excited operation type electromagnetic brake according to the present invention comprises a magnetic pole body fixed to a frame or the like in a state where the electromagnetic coil is mounted and mounted on a driven shaft, and a permanent magnet mounted therein. An armature facing the magnetic pole body and movably mounted on the driven shaft, and integrally attached to the driven shaft,
Moreover, on the opposite side of the armature from the magnetic pole body,
A hub connected to the armature via a leaf spring is provided, and the means for fixing the leaf spring to the hub can be tightened and released from a side of the hub opposite to the armature. (1) The means for fixing the leaf spring to the hub can be tightened or released from the side of the hub opposite to the armature. Therefore, the hub can be easily separated from the armature even when the armature and the magnetic pole are magnetically attracted when the power is not supplied. (2) The hub can be separated while the armature and the magnetic pole are magnetically attracted.
For this reason, the concentricity between the armature and the magnetic pole body does not deviate, and the work of adjusting the concentricity of the two when the hub is reassembled becomes unnecessary, and the work efficiency is improved.

[Brief description of the drawings]

1 is a front sectional view at the time of energization of the electromagnetic brake B ₁ of the first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the same.

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

4 is a front sectional view of the electromagnetic brake B ₁ in the non-energized.

FIG. 5 is an operation explanatory view showing a state in which the hexagon socket head cap bolt 15 is removed to separate the hub 2 and the leaf spring 9;

6 is an enlarged sectional view of a main part of the electromagnetic brake B ₂ of the second embodiment.

7 is a front sectional view of an electromagnetic brake B ₃ of the third embodiment.

FIG. 8 is a front sectional view of a conventional electromagnetic brake B '.

FIG. 9 shows the state of the armature 4 and the magnetic pole body 5 during energization.
And the magnetic flux φ in the opposite direction ₁, φ_TwoState in which is formed
FIG.

FIG. 10 is a diagram showing a state in which a magnetic flux φ ₁ ′ of a permanent magnet 6 reaches a magnetic pole body 5 when power is not supplied.

[Explanation of symbols]

B _{1 to} B ₃ : electromagnetic brake F: frame 1: shaft (driven shaft) 2: hub 2a: bolt insertion hole (bolt hole) 4: armature 5: magnetic pole body 6: permanent magnet 8: electromagnetic coil 9: leaf spring 15 , 25: Hexagon socket head bolt (fixing means) 16, 24: Hex nut (fixing means) 17: Nut receiving hole (recess) 18, 23: Detent pin 21: Bolt receiving hole (recess) 22: Hex bolt (fixing) Means) 26: Through-hole

Claims (5)

[Claims] 1. A magnetic pole body having an electromagnetic coil mounted therein and fixed to a frame or the like in a state of being mounted on a driven shaft, and a permanent magnet mounted therein so as to be movable on the driven shaft in opposition to the magnetic pole body. An armature provided externally; and a hub integrally attached to the driven shaft and connected to the armature via a leaf spring on a side opposite to the magnetic pole body of the armature. The armature is magnetically attracted to the magnetic pole body by the action of a permanent magnet against the elastic restoring force of the non-excited operation type electromagnetic brake configured to apply a braking force to the driven shaft, wherein the leaf spring and the A non-excited operation type electromagnetic brake characterized in that the means for fixing to the hub can be tightened and released from a side of the hub opposite to the armature. 2. The fixing means is provided on a side of the armature opposite to the hub, the bolt being received in a bolt hole of the hub from the side opposite to the armature, and being screwed with the bolt. 2. The non-excited operation type electromagnetic brake according to claim 1, further comprising a nut housed in the recessed portion in a detented state. 3. The fixing means is housed in a recess provided on the side of the armature facing the hub in a non-rotating state, and has a threaded part of the bolt protruding on the side of the hub opposite to the armature. The non-excited operation type electromagnetic brake according to claim 1, further comprising a nut screwed into the screw portion. 4. The non-exciting operation according to claim 2, wherein the detent means is a detent pin attached to an inner wall portion of the recess along an axial direction of a driven shaft. Type electromagnetic brake. 5. A magnetic pole body fixed to a frame or the like in which an electromagnetic coil is mounted and mounted on a driven shaft, and a permanent magnet is mounted so as to be movable to the driven shaft in opposition to the magnetic pole body. An armature provided externally; and a hub integrally attached to the driven shaft and connected to the armature via a leaf spring on a side opposite to the magnetic pole body of the armature. The armature is magnetically attracted to the magnetic pole body by the action of a permanent magnet against the elastic restoring force of the non-excited operation type electromagnetic brake configured to apply a braking force to the driven shaft, wherein the leaf spring and the The means for fixing to the armature is a bolt, and a through hole for tightening and releasing from the opposite side of the hub from the armature is provided in a portion of the hub corresponding to the bolt. Non-excitation type electromagnetic brake, characterized by being.