JPH1163049A - Permanent magnet type non-excitation operated electromagnetic brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a permanent magnet type non-excitation operated electromagnetic brake as being capable of restraining noise during braking and attraction to be extremely low in consideration of ambient environment. SOLUTION: For an electromagnetic brake, a rubber O-ring 11 is attached to the outer periphery and/or the inner periphery of an armature 2 to restrain vibration noise during attraction and release with the damping effect of rubber as well as squeal noise during braking. A rubber ring or a rubber string can be used instead of the rubber O-ring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type non-excited operation type electromagnetic brake, and more particularly to a permanent magnet type non-excited operation type electromagnetic brake capable of preventing attraction sound and release sound.

[0002]

2. Description of the Related Art In recent years, a permanent magnet type non-exciting operation type electromagnetic brake has been used as a holding / braking brake for an AC servomotor, a stepping motor or the like. First, a configuration of a conventional permanent magnet type non-excitation operation type electromagnetic brake will be described with reference to FIG. FIG. 5 is a half sectional front view of a conventional permanent magnet type non-excitation operation type electromagnetic brake. In FIG.
4 is a field core fixed to a stationary part (not shown) and having a magnetic circuit, 5 is a coil wound annularly in the field core 4, 6 is a lining adhered to the field core 4, 2 is a lining 6 An armature 1 provided opposite to the armature 1 with an axial gap a therebetween is fixed to a drive shaft (not shown), and a hub provided with the armature 2 slidably in the axial direction. A leaf spring 7 is provided so as to always urge the hub 2 toward the hub 1, and 7 is a permanent magnet. next,
The operation configured as described above will be described. When the brake is ON: magnetic flux from coil 5 is cut off (coil 5
And the magnetic flux from the permanent magnet 7 causes the gap a
, A magnetic attraction force is generated, and the armature 2 is attracted by overcoming the tensile force of the leaf spring 3, so that a = 0 and the brake is turned on. When the brake is OFF: When the coil 5 is energized and turned on, the magnetic flux from the coil 5 is generated so as to cancel the magnetic flux from the permanent magnet 7, and the magnetic attraction force is canceled and repelled between the gaps a. The armature 2 is released by the pulling force, and the brake is turned off.

[0003]

However, the conventional permanent magnet type non-exciting operation type electromagnetic brake shown in FIG. 5 generates very little noise during braking and suction due to consideration of the surrounding environment. There have been the following problems, for example, there are many requests from users to suppress noise. Since the permanent magnet 7 has no inductance and has extremely good response when the brake is ON as compared with a normal electromagnetic brake,
The suction noise generated by the armature 2 being strongly absorbed is large. Even when the brake is off, the hub 1 is strongly hit via the leaf spring 3 when the armature 2 is released, so that a release sound is produced (in this case, the sound level is lower than when the brake is on). In particular, when the armature 2 comes into direct contact with the field core 4, a high-level suction sound is generated.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to prevent the suction sound and the release sound, the present invention provides a field core fixed to a stationary portion, and a ring wound around the field core. A coil, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft and slidably provided in the axial direction. A hub, one end of which is fixed to the armature, a leaf spring provided so as to always bias the armature toward the hub, and a permanent magnet provided to the armature. A magnetic flux is passed through the field core and a predetermined portion of the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature so that In a permanent magnet type non-excitation operation type electromagnetic brake capable of connecting a field core and the armature, as a first invention corresponding to claim 1, rubber is provided on an outer peripheral portion and / or an inner peripheral portion of the armature. By installing an O-ring made, the vibration sound generated at the time of suction and release is suppressed by the damping effect of rubber, and at the same time, the sound generated at the time of braking is also suppressed,
According to a second aspect of the present invention, a rubber ring is integrally formed on an outer peripheral portion and / or an inner peripheral portion of an armature to be attached to the armature so as to increase the degree of close contact. A third invention corresponding to claim 3 is provided in which a double-sided adhesive tape is attached to a rubber ring or a rubber string, wherein the rubber ring or the rubber string is attached. Wrap around the outer and / or inner circumference of the armature to suppress the vibration noise generated during suction and release by the rubber damping effect,
At the same time, the present invention provides a device capable of suppressing the squealing noise generated at the time of braking.
The rubber ring is press-fitted and fixed to the outer and / or inner circumference of the armature to suppress the vibration noise generated during suction and release by the damping effect of the rubber, and at the same time the noise generated during braking can be suppressed. According to a fifth aspect of the present invention, a projection is provided on a rubber O-ring, a rubber ring or a rubber string so as to protrude from an outer peripheral shoulder of the armature, and the armature is attached to a leaf spring. The object of the present invention is to provide a device in which the hub does not come into contact with the hub via a cable and the tapping sound upon release is largely suppressed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a permanent magnet type non-excited operation type electromagnetic brake according to the present invention is shown in FIG.
This will be described with reference to FIGS. FIGS. 1A and 1B show an embodiment of the first invention corresponding to claim 1, in which a rubber O-ring is attached to an outer peripheral portion and / or an inner peripheral portion of an armature. (B) shows a rubber O-ring attached to the outer peripheral shoulder of the armature, and FIG. 1 (C) shows a fifth embodiment of the invention corresponding to claim 5. A rubber O-ring is attached so as to protrude from the outer peripheral shoulder of the armature,
FIG. 2A shows an embodiment of the second invention corresponding to claim 2, in which a rubber ring is integrally formed on an outer peripheral portion and / or an inner peripheral portion of the armature.
(B) shows an embodiment of the fifth invention corresponding to claim 5, in which a rubber ring is attached so as to protrude from an outer peripheral shoulder of an armature, and FIG.
(B) shows an embodiment of the third invention corresponding to claim 3, and (A) attaches a rubber ring or a rubber string to an outer peripheral portion and / or an inner peripheral portion of the armature with a double-sided adhesive tape. FIG. 3B is a diagram in which a rubber ring or a rubber string is wound around a groove in an outer peripheral portion and / or an inner peripheral portion of the armature and is attached with a double-sided adhesive tape.
(C) shows an embodiment of the fifth invention corresponding to claim 5, wherein a rubber ring or a rubber string is attached so as to protrude from the outer peripheral shoulder of the armature, and FIG. Shows an embodiment of the fourth invention corresponding to claim 4, in which a rubber ring is press-fitted into an outer peripheral portion and / or an inner peripheral portion of an armature, and FIG.
A fifth embodiment of the present invention corresponding to claim 5, wherein a rubber ring is attached so as to protrude from an outer peripheral shoulder of an armature. First, all of the first to fifth embodiments of the present invention, as shown in FIG.
A field core 4 fixed to a stationary portion, a coil 5 wound annularly in the field core 4, a lining 6 adhered to the field core 4, and facing the lining 6 via a predetermined axial gap. Armature 2, a hub 1 fixed to a drive shaft (not shown) and provided with the armature 2 slidable in the axial direction, and an armature 2 fixed at one end to the armature 2.
And a permanent magnet 7 provided on the armature 2, and the coil 5 is provided with the field core 4 and the armature 2 when energized. A magnetic flux is passed through a predetermined portion of the armature 2 to overcome the magnetic flux from the permanent magnet 7 to attract and move the armature 2 so that the field core 4 and the armature 2 can be connected. This is for the excitation operation type electromagnetic brake.
Next, embodiments of the first to fifth aspects of the invention will be sequentially described. Embodiment of First Invention: See FIGS. 1 (A) and 1 (B) A rubber O-ring 11 is attached to the outer peripheral portion and / or the inner peripheral portion of the armature 2 to generate vibration noise generated during suction and release. The squealing noise generated during braking can be suppressed at the same time. Embodiment of the Second Invention: See FIG. 2 (A) A rubber ring 21 is integrally molded and attached to the outer peripheral portion and / or the inner peripheral portion of the armature 2 so as to increase the degree of adhesion, so that the armature 2 can be attached and released. Vibration noise generated at the time is suppressed by the damping effect of rubber, and at the same time, squealing noise generated during braking can also be suppressed. Third Embodiment: See FIGS. 3 (A) and 3 (B) A double-sided adhesive tape 32 is attached to a rubber ring or a rubber string 31 and wound around the outer and / or inner periphery of the armature 2 so as to be used for suction and Vibration noise generated during release is suppressed by the damping effect of rubber, and at the same time noise generated during braking is also suppressed. Embodiment of Fourth Invention: See FIG. 4 (A) A rubber ring 41 is press-fitted and fixed to the outer peripheral portion and / or the inner peripheral portion of the armature 2 to reduce the vibration noise generated at the time of suction and release by the rubber. At the same time, the squealing noise generated during braking can also be suppressed. Embodiment of Fifth Invention: See FIGS. 1 (C), 2 (B), 3 (C), and 4 (B). Rubber O-ring 11 and rubber ring protruding from the outer peripheral portion of armature 2 21 or a rubber ring or a rubber string 31 is provided with a projection so as to prevent the armature 2 from contacting the hub 1 via the leaf spring 3 so that a tapping sound upon release can be largely suppressed.

[0006]

The permanent magnet type non-excited operation type electromagnetic brake according to the present invention is configured as described above, and has the following effects. By attaching a rubber O-ring, a rubber ring or a rubber string to the outer peripheral portion and / or the inner peripheral portion of the armature as in the first to fourth inventions, the vibration is attenuated due to the vibration damping effect of the rubber. Vibrating noise can be suppressed. By providing the protrusions as in the fifth invention, the armature does not contact the hub via the leaf spring, so that the release sound can be largely suppressed.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment corresponding to claim 1; FIG.
(A) in which a rubber O-ring is attached to the outer peripheral portion and / or inner peripheral portion of the armature, and (B) is a diagram in which the rubber O-ring is attached to the outer peripheral shoulder portion of the armature. FIG. 1C shows a fifth embodiment of the present invention corresponding to claim 5, wherein a rubber O-ring is attached so as to protrude from the outer peripheral shoulder of the armature. is there.

FIG. 2 (A) shows an embodiment of the second invention corresponding to claim 2, wherein a rubber ring is integrally formed on an outer peripheral portion and / or an inner peripheral portion of the armature. ,
FIG. 2B shows a fifth embodiment of the present invention corresponding to claim 5, in which a rubber ring is attached so as to protrude from the outer peripheral shoulder of the armature.

FIGS. 3A and 3B show a third embodiment of the present invention; FIG.
(A) shows a rubber ring or a rubber string attached to the outer and / or inner periphery of an armature with a double-sided adhesive tape, and (B) shows a rubber ring or a rubber. A string is wound around a groove in an outer peripheral portion and / or an inner peripheral portion of an armature and is attached with a double-sided adhesive tape. FIG. 3C shows a fifth embodiment of the present invention corresponding to claim 5. A rubber ring or a rubber string is attached so as to protrude from an outer peripheral shoulder of an armature.

FIG. 4 (A) shows a fourth embodiment of the present invention corresponding to claim 4, wherein a rubber ring is press-fitted into an outer peripheral portion and / or an inner peripheral portion of the armature; FIG.
(B) shows an embodiment of the fifth invention corresponding to claim 5, in which a rubber ring is attached so as to protrude from an outer peripheral shoulder of an armature.

FIG. 5 is a half sectional front view of a conventional permanent magnet type non-excitation operation type electromagnetic brake.

[Explanation of symbols]

 1: Hub 2: Armature 3: Leaf spring 4: Field core 5: Coil 6: Lining 7: Permanent magnet 11: Rubber O-ring 21: Rubber ring 31: Rubber ring or rubber string 32: Double-sided adhesive tape 41: Rubber ring a: Clearance

Claims (5)

[Claims] A field core fixed to a stationary part;
A coil wound annularly in the field core, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft. A hub provided slidably in the axial direction, a leaf spring having one end fixed to the armature and provided to always bias the armature toward the hub, and a permanent magnet provided on the armature. When the coil is energized, the magnetic flux flows through a predetermined portion of the field core and the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature, thereby connecting the field core and the armature. A permanent magnet type non-excited operation type electromagnetic brake, Rubber O on outer and / or inner circumference
A permanent magnet type non-exciting electromagnetic brake characterized by attaching a ring to suppress the vibration noise generated at the time of suction and release by the damping effect of rubber, and at the same time the noise generated during braking can be suppressed. . 2. A field core fixed to a stationary part,
A coil wound annularly in the field core, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft. A hub provided slidably in the axial direction, a leaf spring having one end fixed to the armature and provided to always bias the armature toward the hub, and a permanent magnet provided on the armature. When the coil is energized, the magnetic flux flows through a predetermined portion of the field core and the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature, thereby connecting the field core and the armature. A permanent magnet type non-excited operation type electromagnetic brake, A rubber ring is integrally molded and attached to the outer and / or inner periphery to increase the degree of adhesion. Vibration noise generated during suction and release is suppressed by the damping effect of rubber, and simultaneously generated during braking. A permanent magnet type non-excited operation type electromagnetic brake characterized in that squealing noise can be suppressed. 3. A field core fixed to a stationary part,
A coil wound annularly in the field core, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft. A hub provided slidably in the axial direction, a leaf spring having one end fixed to the armature and provided to always bias the armature toward the hub, and a permanent magnet provided on the armature. When the coil is energized, the magnetic flux flows through a predetermined portion of the field core and the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature, thereby connecting the field core and the armature. Rubber ring or rubber for permanent magnet type non-excited operation type electromagnetic brake Attaching a double-sided adhesive tape to the string and winding it around the outer and / or inner periphery of the armature,
A permanent magnet type non-excited operation type electromagnetic brake characterized in that vibration noise generated during suction and release is suppressed by the damping effect of rubber, and at the same time, squeal noise generated during braking is also suppressed. 4. A field core fixed to a stationary part,
A coil wound annularly in the field core, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft. A hub provided slidably in the axial direction, a leaf spring having one end fixed to the armature and provided to always bias the armature toward the hub, and a permanent magnet provided on the armature. When the coil is energized, the magnetic flux flows through a predetermined portion of the field core and the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature, thereby connecting the field core and the armature. In a permanent magnet type non-excited operation type electromagnetic brake which is capable of -It is press-fitted and fixed to the outer and / or inner circumference of the armature to suppress the vibration noise generated at the time of suction and release by the damping effect of rubber, and at the same time to suppress the squealing noise generated during braking. Permanent magnet type non-excitation type electromagnetic brake. 5. A field core fixed to a stationary part,
A coil wound annularly in the field core, a lining adhered to the field core, an armature provided to face the lining via a predetermined axial gap, and an armature fixed to a drive shaft. A hub provided slidably in the axial direction, a leaf spring having one end fixed to the armature and provided to always bias the armature toward the hub, and a permanent magnet provided on the armature. When the coil is energized, the magnetic flux flows through a predetermined portion of the field core and the armature to overcome the magnetic flux from the permanent magnet to attract and move the armature, thereby connecting the field core and the armature. A permanent magnet type non-excited operation type electromagnetic brake, A protrusion is provided on a rubber O-ring, rubber ring or rubber string so as to protrude from the outer shoulder, so that the armature does not contact the hub via the leaf spring, and the tapping sound upon release is large. A permanent magnet type non-excited operation type electromagnetic brake characterized in that the electromagnetic brake is suppressed.