Double-gap friction-free electromagnetic brake

Abstract

The utility model relates to the technical field of electromagnetic brakes, and provides a double-gap friction-free electromagnetic brake which comprises a magnet yoke, an armature, a rotor and a flange which are sequentially arranged in the axial direction, and further comprises an elastic supporting piece which is arranged between the rotor and the flange and fixed to the middle of the flange. According to the utility model, when the rotor is in a brake release state, the two sides of the rotor have gaps without contact and friction, the abrasion of the brake disc rotor is reduced, and the service life of the brake disc rotor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic brakes, and more specifically, to an electromagnetic brake with double gaps and no friction. Background Art

[0002] An electromagnetic brake is a device for braking, stopping or holding a shaft or a rotating body, which consists of a yoke, an armature and a brake disc. When the coil of the yoke is energized or de-energized, the armature will move axially to achieve suction and braking. There is an air gap between the armature and the yoke. In most existing electromagnetic brakes, this air gap is 0 when the armature is attracted. When the yoke loses power, the torque spring ejects the armature and pushes the brake disc towards the flange side, so that when the braking is released, there is still frictional contact between one end face of the brake disc and the flange end face. This causes one end face of the brake disc to be easily worn when the brake disc rotates with the shaft for a long time, shortening its service life and resulting in abnormal wear and failure of the brake. Content of the Utility Model

[0003] The purpose of the utility model is to provide an electromagnetic brake with double gaps and no friction to ensure that when the braking is released, both sides of the brake disc are in a non-frictional state, reducing the wear of the brake disc rotor and extending its service life.

[0004] The utility model is realized by the following technical solutions: An electromagnetic brake with double gaps and no friction includes a yoke, an armature, a rotor and a flange arranged axially in sequence, and further includes an elastic support member, which is arranged between the rotor and the flange, and the elastic support member is fixed in the middle of the flange.

[0005] Further, a first bearing is embedded and installed in the inner hole of the flange, and the first bearing abuts against the elastic support member.

[0006] Further, a detachable bearing gland is installed on the flange.

[0007] Further, it further includes a brake shaft, the brake shaft is connected to the rotor, and the brake shaft is rotatably connected to the yoke. A second bearing is arranged between the brake shaft and the yoke; an insertion cylinder for docking with the motor shaft is arranged at one end of the brake shaft close to the yoke.

[0008] Further, the elastic support member adopts a disc spring.

[0009] Further, a torque spring is embedded in the yoke, and one end of the torque spring is connected to the armature.

[0010] Further, a dust-proof cover is sleeved between the flange and the yoke; the dust-proof cover is of an annular structure.

[0011] The technical solution of the present utility model has at least the following advantages and beneficial effects: By providing an elastic support between the flange and the rotor, and the elastic force thereof is less than that of the torque spring of the yoke, and in cooperation with the shoulder of the brake shaft, when the armature is attracted, the elastic support can push the rotor to separate, so that a non-contact friction state is formed on both end faces of the rotor, and the rotor will not be worn when rotating with the motor shaft, thus extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0013] Figure 1 FIG. is a schematic structural view of one end face of the flange of the double-gap frictionless electromagnetic brake provided for the embodiment of the present utility model;

[0014] Figure 2 is Figure 1 a cross-sectional view of the electromagnetic brake when attracted in the A-A direction in;

[0015] Figure 3 FIG. is a schematic structural view of the electromagnetic brake of the present utility model when powered off and braked.

[0016] Reference numerals: 1 - yoke, 11 - torque spring, 12 - dust cover, 2 - armature, 3 - rotor, 4 - flange, 5 - elastic support, 6 - bearing gland, 7 - second bearing, 8 - first bearing, 9 - brake shaft, 91 - insertion cylinder, 92 - shoulder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0019] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] The following is further described in conjunction with specific embodiments, with reference to Figures 1 - 3 As shown, this embodiment is a double-gap frictionless electromagnetic brake, which includes a yoke 1, an armature 2, a rotor 3 and a flange 4 arranged axially in sequence, and further includes an elastic support member 5, which is arranged between the rotor 3 and the flange 4, and the elastic support member 5 is fixed to the middle of the flange 4; specifically, the elastic force of the spring of the yoke 1 is greater than the elastic force of the elastic support member 5. When the yoke 1 is powered off for braking, the armature 2 presses against the rotor 3, and the rotor 3 will have a slight axial movement towards the flange 4 side, and the elastic support member 5 will be compressed by a certain amount. The two sides of the rotor 3 are in contact and friction with the armature 2 and the flange 4 respectively to achieve the braking effect; when the yoke 1 is powered on and attracted, after the extrusion of the armature 2 on the rotor 3 is released, the elastic support member 5 will push the rotor 3 towards the armature 2 side by a slight displacement during the reset process, so that the contact between the flange 4 and the rotor 3 is released, ensuring that there are gaps on both sides of the rotor 3 without contact wear. Figure 2 and Figure 3 It reflects the changes in the gaps on both sides of the rotor 3 in the two states of the brake.

[0021] As Figure 2 shown, this embodiment further includes a brake shaft 9, the brake shaft 9 is connected to the rotor 3, and the brake shaft 9 and the rotor 3 are connected by a flat key, and the brake shaft 9 is rotatably connected to the yoke 1, and a second bearing 7 is provided between the brake shaft 9 and the yoke 1; two shoulders 92 are provided on the brake shaft 9 to respectively abut against the end faces of the rotor 3 and the second bearing 7, and the elastic support member 5 stops when it contacts the shoulder 92 when pushing back the rotor 3, ensuring the air gap between the rotor 3 and the armature 2.

[0022] In order to facilitate the connection between the brake and the motor shaft and make the brake better installed and applied on the motor, an insertion cylinder 91 for docking with the motor shaft is provided at one end of the brake shaft 9 close to the yoke 1. A first bearing 8 is embedded in the inner hole of the flange 4, and the first bearing 8 abuts against the elastic support member 5. The first bearing 8 cannot move, and the elastic force of the elastic support member 5 only acts towards the rotor 3.

[0023] More preferably, a detachable bearing cover 6 is installed on the flange 4.

[0024] Optionally, the elastic support member 5 is a disc spring, and the disc spring is a cylindrical structure with a through hole in the middle for sleeving on the brake shaft 9.

[0025] As Figure 3As shown in the figure, a torsion spring 11 is embedded in the yoke 1. One end of the torsion spring 11 is connected to the armature 2. The length direction of the torsion spring 11 is consistent with the axial directions of the elastic support 5 and the yoke 1.

[0026] Refer to Figure 2 As shown in the figure, in order to prevent dust from entering between the rotor 3 and the yoke 1 and interfering with the normal braking of the brake, a dust-proof cover 12 is sleeved between the flange 4 and the yoke 1; the dust-proof cover 12 is of an annular structure and wraps the open structure of the brake.

[0027] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A double-gap frictionless electromagnetic brake, comprising a yoke (1), an armature (2), a rotor (3) and a flange (4) arranged axially in sequence, characterized in that: It further includes an elastic support member (5) which is arranged between the rotor (3) and the flange (4), and the elastic support member (5) is fixed to the middle of the flange (4).

2. The double-gap frictionless electromagnetic brake according to claim 1, wherein: A first bearing (8) is embedded and installed in the inner hole of the flange (4), and the first bearing (8) abuts against the elastic support member (5).

3. The double-gap frictionless electromagnetic brake according to claim 2, characterized in that: A detachable bearing gland (6) is installed on the flange (4).

4. The double-gap frictionless electromagnetic brake according to claim 1, characterized in that: It further includes a brake shaft (9), the brake shaft (9) is connected to the rotor (3), and the brake shaft (9) is rotatably connected to the yoke (1). A second bearing (7) is provided between the brake shaft (9) and the yoke (1).

5. The double-gap frictionless electromagnetic brake according to claim 4, characterized in that: One end of the brake shaft (9) close to the yoke (1) is provided with an insertion cylinder (91) for docking with the motor shaft, and a shaft shoulder (92) is provided on the brake shaft (9).

6. The double-gap frictionless electromagnetic brake according to claim 1, characterized in that: The elastic support member (5) is a disc spring.

7. The double-gap frictionless electromagnetic brake according to claim 1, wherein: A torque spring (11) is embedded in the yoke (1), and one end of the torque spring (11) is connected to the armature (2).

8. The double-gap frictionless electromagnetic brake according to claim 1, characterized in that: A dust-proof cover (12) is sleeved between the flange (4) and the yoke (1).

9. The double-gap frictionless electromagnetic brake according to claim 8, characterized in that: The dust-proof cover (12) is of an annular structure.

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