JPH0510834U - Electromagnetic brake - Google Patents

Abstract

(57) [Summary] [Purpose] In an electromagnetic brake, even if the coil is de-energized, the magnetic flux (magnetic attraction) is not attenuated so much that the armature is not released quickly, and the brake is released. It solves the problem of time being long. A magnetic pole body 1 having a recess for accommodating an exciting coil 4 and having a base portion fixed to a fixed portion and having an inverted U-shaped cross section is fixed to the magnetic pole body 1 so as to embrace it. The brake plate 5, which has a substantially U-shaped cross section, and the armature 7, which is supported by a spline or the like so as to be movable in the axial direction at a predetermined distance from the friction surface of the brake plate 5, and In an electromagnetic brake including a return spring 8 for an armature 7, a non-magnetic material color (non-magnetic color) is included in a magnetic circuit composed of the magnetic pole body 1 and the brake plate body 5. 11 was attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is an electromagnetic brake alone or an electromagnetic clutch / break unit electromagnetic brake. The present invention relates to improvement of an electromagnetic brake used as a key portion.

[0002]

[Prior art]

  A conventional electromagnetic brake of this type is constructed as shown in FIG.   In the figure, 1 is a magnetic pole body having an inverted U-shaped cross section, and this magnetic pole body is a machine frame. Alternatively, it is fixed with screws 3 etc. to the fixed part 2 such as the casing of the clutch / break unit. Has been done.   An exciting coil 4 is housed in the recess 1a of the magnetic pole body 1. 5 has a substantially U-shaped cross section It is a break plate and is fixed to the magnetic pole body 1 by screws 6. In addition, 5a is a notch groove, 5 Reference numeral b is a friction plate. 7 is an armature, the base of which is sprung onto an armature hub 9. It is line-coupled, and the return spring 8 is attached to the drive shaft 10 in the radial direction. Is fixed and supported so as to be movable in the axial direction.

[0003]   In the above configuration, the armature 7 is operated when the coil 4 is not energized and is not excited. Is rotating with the drive shaft.   When the coil 4 is excited in this state, the magnetic flux passes as shown by the broken line in FIG. The magnetic attraction of the magnetic pole body 1 attracts the armature 7 to the left, The plate 5 is brought into close contact with the friction plate 5b, and the braking force is applied to the armature 7, and hence the drive shaft 10. Granted.

[0004]

[Problems to be solved by the device]

  By the way, in the case of this type of conventional electromagnetic brake, a magnetic circuit is constructed as shown in FIG. Among the connecting portions of the magnetic pole body 1 and the brake plate body 5 formed, particularly the inner peripheral tip portion 1 of the magnetic pole body 1. Mutual contact between N and the inner peripheral step portion 5D of the brake plate body 5 is a surface contact. Since the magnetic resistance of the part is small, the magnetic flux (magnetic absorption The damping force of the attractive force is not good, the armature 7 is not released quickly, and the brake release time is long. There was a problem that it becomes longer.   The present invention solves the above problems (problems) of conventional electromagnetic brakes. The purpose is to provide.

[0005]

[Means for Solving the Problems]

  The present invention has a recess for accommodating an exciting coil, and its base is fixed to a fixed section. Is an inverted U-shaped magnetic pole body, and the cross section that is fixed to this magnetic pole body to hold it is A substantially U-shaped brake plate, at a predetermined distance from the friction surface of the brake plate. An armature supported by a spline or the like so as to be movable in the axial direction, and this armature. In an electromagnetic brake including a return spring for a tuner, the magnetic pole body and the brake plate body A non-magnetic material color (called a non-magnetic color) is installed in the magnetic circuit composed of It relates to an electromagnetic brake adapted to be worn.   In this case, a non-magnetic color is attached to the step portion 1M at the tip of the inner circumference of the magnetic pole body and the brake plate body. It is desirable to mount it between the step portions 5E on the inner circumference.

[0006]

[Action]

  According to the present invention, the sub-coupling of the magnetic pole body and the brake plate constituting the magnetic circuit is With the conventional one, especially the stepped portion 1M at the tip of the inner circumference of the magnetic pole body 1 having a small magnetic resistance. A non-magnetic color is attached to the contact portion between the brake plate body 5 and the inner peripheral step portion 5E as described later. Since the magnetic resistance of the magnetic circuit is increased to be appropriate, When the coil is de-energized, the magnetic flux (magnetic attraction force) decays faster and the armature Release time is reduced.

[0007]

【Example】

  Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIG.   In the figure, the same parts as those of the conventional one are designated by the same reference numerals as those in FIG. Indicated.   11 is a non-magnetic color such as aluminum or stainless steel. -11 is a step portion 1M formed at the tip of the inner circumference of the magnetic pole body 1 and the inner circumference of the brake plate body 5. It is press-fitted and mounted between the formed step portions 5E. The electromagnetic brake of the present invention is as described above. Composed.

[0008]   In the present invention, the application of the braking force by energizing the coil 4 is exactly the same as the conventional one. To be done.   By the way, in the present invention, the non-magnetic color 11 exists in the magnetic circuit. , The magnetic flux (magnetic attraction force) after the energization of the exciting coil 4 is cut off quickly, Armature 7 release time is reduced.

[0009]

[Effect of device]

  According to the present invention, a non-magnetic color is provided in the magnetic circuit of the electromagnetic brake as described above. The addition of the extremely simple configuration has the following excellent effects. After the coil is de-energized, the magnetic flux (magnetic attraction force) is quickly attenuated. -Mature, that is, the release time of the brake is significantly shortened as compared with the conventional one. Therefore, when this plan is applied to the brake of the electromagnetic clutch and the brake unit, The inching operation of the clutch and the brake is performed smoothly, and with the conventional one, the brake operation is performed. The situation of abnormal friction of the clutch caused by the long release time of the It came to be stopped.

[Brief description of drawings]

FIG. 1 is a front view of a half section showing an embodiment of the present invention.

FIG. 2 is a front view of a half section showing a configuration of a conventional example.

[Explanation of symbols]

1: Magnetic pole body 1M: Step 4: Excitation coil 5: Break plate 5E: Step 7: Amateur 8: Return spring 11: Non-magnetic color

Claims (2)

[Scope of utility model registration request] 1. A magnetic pole body 1 having a recess for accommodating an exciting coil 4 and having a base portion fixed to a fixing portion and having an inverted U-shaped section.
The brake plate body 5, which has a substantially U-shaped cross section and is fixed to the magnetic pole body 1 so as to embrace the magnetic pole body 1, is axially spaced from the friction surface of the brake plate body 5 at a predetermined interval. And the armature 7 which is movably supported by a spline or the like.
In an electromagnetic brake including a return spring 8 for a mature member 7, a non-magnetic material color 11 (referred to as a non-magnetic color) is included in a magnetic circuit formed by the magnetic pole body 1 and the brake plate body 5. ) An electromagnetic brake characterized by being attached. 2. An electromagnetic brake according to claim 1, wherein a non-magnetic color is mounted between the step portion 1M at the tip of the inner circumference of the magnetic pole body and the step portion 5E at the inner circumference of the brake plate body. .