Motor brake with pressure bearing structure and servo motor

Abstract

The utility model discloses a motor brake with a pressure bearing structure and a servo motor, and belongs to the technical field of motor structures, the brake comprises a magnet yoke and a bearing, the center of one end of the magnet yoke is provided with a containing groove, the bearing is installed in the containing groove, and the bottom wall of the containing groove is provided with a pressure bearing part to axially limit the bearing. According to the utility model, the structure of the brake in the servo motor is improved, so that the brake has the function of pressing the bearing during assembly, a pressing plate structure in the existing servo motor is eliminated, the internal space of the servo motor is saved, and the bearing is convenient to install. On the whole, the structure of the servo motor is more compact, the length of the servo motor is reduced, and the production difficulty and cost are also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor structure technical field, and especially relates to motor brake with pressure bearing structure and servo motor. BACKGROUND

[0002] Servo motor usually has the brake function, that is, through setting the brake (also called the brake, the brake) in the servo motor, realizing the quick brake of the motor by the brake according to the instruction of servo system. Servo motor brake is mostly as a kind of safety measure, can ensure that equipment does not produce accidental injury or equipment damage when stopping running due to motor rotation for too long. Servo motor brake is based on electromagnetic principle, and its working principle is that when electric current flows through the magnetic coil of electromagnetic brake, electromagnetic force will attract brake pad, makes it release brake disc, to allow transmission shaft to drive brake disc to carry out normal operation or start. Once the electric current of electromagnetic brake is cut off, brake pad will be separated from brake disc, at this moment, friction torque between brake disc, brake pad and flange plate will make transmission shaft stop rotating quickly.

[0003] The brake is generally annular, and the bearing is usually concentrically arranged in the center of the brake and connected with the motor shaft sleeve. In order to fix the bearing on the relative position of the motor shaft, a pressing plate is usually additionally installed to press and fix the outer ring of the bearing. However, such design causes the bearing installation structure to be thick, which is not conducive to the miniaturization of the overall size of the servo motor. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a motor brake with pressure bearing structure and servo motor, which realizes the fixation of the bearing by optimizing the structure of the brake.

[0005] To achieve the above-mentioned purpose, the utility model technical scheme is as follows: a motor brake with pressure bearing structure is provided, the brake includes,

[0006] A magnetic yoke, a containing groove is formed in the center of one end of the magnetic yoke, and a pressure bearing part is arranged on the bottom wall of the containing groove;

[0007] A bearing is installed in the containing groove, and the pressure bearing part axially limits the bearing.

[0008] In an embodiment, a containing space is formed between the inner wall of the containing groove and the outer edge of the bearing to install the stepped structure on the first shell.

[0009] In an embodiment, the bearing includes an inner ring and an outer ring, the inner ring is coaxially arranged inside the outer ring, the outer ring is in axial contact with the pressure bearing part, and the inner ring is sleeved on the motor shaft.

[0010] In an embodiment, a first through hole is formed in the bottom wall of the containing groove to pass through the motor shaft.

[0011] In an embodiment, the brake further comprises a lower armature, an upper armature, a friction disc and a shaft sleeve, the lower armature is connected with the magnetic yoke axially through a spring, the upper armature is fixedly connected with the magnetic yoke axially through a screw, the lower armature is arranged axially between the upper armature and the magnetic yoke, the friction disc is coaxially mounted between the upper armature and the lower armature, and the shaft sleeve is coaxially mounted in the friction disc.

[0012] The application further provides a servo motor, comprising a motor shaft, a rotating stator assembly, a second housing, the rotating stator assembly is coaxially mounted in the second housing, the rotating stator assembly is coaxially sleeved on the motor shaft, both ends of the motor shaft extend out of the second housing, the servo motor further comprises the above brake, the brake is coaxially sleeved on the motor shaft, and a first housing, the first housing and the second housing are fixedly connected axially, and the brake is coaxially mounted in the first housing.

[0013] In an embodiment, a stepped structure is protruded axially in the housing, the stepped structure is arranged in the accommodating space between the magnetic yoke and the bearing to limit the bearing radially.

[0014] In an embodiment, a bearing positioning groove is formed in the inner side of the stepped structure to limit the bearing.

[0015] In summary, the brake structure of the servo motor is improved, the brake has the function of pressing the bearing when assembled, the pressing plate structure in the existing servo motor is cancelled, the internal space of the servo motor is saved, the bearing is convenient to install, the structure of the servo motor is more compact in general, the length of the servo motor is reduced, and the production difficulty and cost are reduced.

[0016] In order to make the above features and advantages of the utility model more obvious and easy to understand, the following examples are taken, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a sectional view of the servo motor in the utility model.

[0018] Figure 2 It is a perspective view of the brake with the bearing pressing structure in the utility model.

[0019] Figure 3 It is an exploded view of Figure 2

[0020] Figure 4 It is a sectional view of the brake and the bearing combination in the utility model. DETAILED DESCRIPTION

[0021] ​To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, back, bottom, and top, are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model.

[0022] Figure 1 This is a cross-sectional view of the servo motor in this utility model. Figure 1 As shown, the servo motor includes a second housing 1, a motor shaft 2, a rotor-stator assembly 3, a brake 4, a first housing 5, an encoder assembly 6, and a third housing 7. The first housing 5 and the second housing 1 are axially fixedly connected. The rotor-stator assembly 3 is coaxially mounted inside the second housing 1. The brake 4 is coaxially mounted inside the first housing 5. The brake 4 and the rotor-stator assembly 3 are coaxially sleeved on the motor shaft 2. The head and tail ends of the motor shaft 2 extend out of the first housing 5 and the second housing 1. The third housing 7 is axially fixedly connected to the first housing 1 and forms a receiving space. The encoder assembly 6 is mounted on one end of the motor shaft 2 that extends out of the first housing 5 and is placed in the receiving space.

[0023] Figure 2 This is a perspective view of the brake with a pressure bearing structure according to this utility model. The brake 4 is generally cylindrical, and it is used to slow down or stop the motor shaft 2 based on friction (see...). Figure 2 (The movement of)

[0024] Figure 3 for Figure 2 The exploded view, combined with Figure 2 and Figure 3 It is known that the brake 4 includes a magnetic yoke 41, a lower armature 42, an upper armature 43, a friction disc 44, and a bushing 45. The lower armature 42 is axially connected to the magnetic yoke 41 by a spring. The upper armature 43 is axially fixed to the magnetic yoke 41 by screws. The lower armature 42 is axially disposed between the upper armature 43 and the magnetic yoke 41. The friction disc 44 is coaxially mounted between the upper armature 43 and the lower armature 42. The bushing 45 is coaxially mounted inside the friction disc 44.

[0025] The magnetic yoke 41 has a first through hole 411 at its center for the motor shaft to pass through. The magnetic yoke 41 is circular so that the magnetic flux is equal at all points on the magnetic yoke 41 when it is magnetically conductive, and the magnetic field strength is uniformly distributed around the magnetic yoke 41. A conductive coil is provided inside the magnetic yoke 41. When the coil is energized, it generates a magnetic field. After the magnetic field is magnetically conductive through the magnetic yoke 41, it generates a magnetic field around the magnetic yoke 41 that can act on the lower armature 42. The lower armature 42 moves axially under the action of the magnetic field to limit or lock the motor shaft 2. The upper armature 43, the magnetic yoke 41, and at least one guide post form an movable space to allow the lower armature 42 and the friction disk 44 to move axially. The upper armature 43 and the lower armature 42 are annular, and a friction disk 44 is axially arranged between the upper armature 43 and the lower armature 42. A bushing 45 is provided inside the friction disk 44 to engage with it. The shape of the inner wall of the friction disc 44 matches the shape of the outer wall of the bushing 45, so that the bushing 45 is positioned inside the friction disc 44. A second through hole 41 is opened in the center of the bushing 45 for the motor shaft 2 to pass through, and the inner wall of the bushing 45 is in close contact with the motor shaft 2.

[0026] When the coil in the magnetic yoke 41 is de-energized, the upper armature 43 and the lower armature 42 will press against the friction disk 44, and the friction disk 44 will stop rotating due to friction, thereby forcing the motor shaft 2 to stop rotating. When the coil is energized, the generated magnetic field will attract the lower armature 42, causing the upper armature 43 and the lower armature 42 to separate. The lower armature 42 will be axially displaced along the guide post to one side of the magnetic yoke 41, and the friction disk 44 will stop contacting the upper armature 43 and the lower armature 42 and be released, and the motor shaft 2 will resume rotation.

[0027] The magnetic yoke 41 has a receiving groove 412 at one end away from the lower armature 42 to accommodate the bearing 46. The bearing 46 includes an outer ring 461 and an inner ring 462. The outer ring 461 and the inner ring 462 are annular and coaxially arranged. A rolling element is provided between the outer ring 461 and the inner ring 462. The inner ring 462 is fixedly connected to the motor shaft 2.

[0028] Figure 4 This is a cross-sectional view of the brake and bearing assembly in this utility model, as shown below. Figure 4 As shown, the magnetic yoke 41 has a receiving groove 412 at its center, and the bottom wall of the receiving groove 412 has a first through hole 411, with the receiving groove 412 communicating with the first through hole 411. The receiving groove 412 is circular, and its diameter is larger than the outer ring diameter of the bearing 46. A receiving space 413 is formed between the inner wall of the receiving groove 412 and the outer wall of the bearing 46.

[0029] The magnetic yoke 41 is provided with the pressing bearing part 414 near one end of the lower armature 42 to axially limit the bearing 46, the pressing bearing part 414 is a part of the bottom wall of the accommodating groove 412, the outer diameter of the pressing bearing part 414 is smaller than the diameter of the outer ring 461 of the bearing 46, but is larger than the diameter of the inner ring 462. The bearing 46 is put into the accommodating groove 412, the pressing bearing part 414 will be in direct axial contact with the outer ring 461 of the bearing 46 for limiting the outer ring 461, while not affecting the normal rotation of the inner ring 462. In combination Figure 1 It can be known that the first housing 5 is axially protruded, the step structure 51 is installed in the accommodating space 413 between the magnetic yoke 41 and the bearing 46, and effectively limits the bearing 46 in the radial direction. At the same time, the bearing positioning groove 52 is formed in the inner side of the step structure 51, the size of the inner ring of the bearing positioning groove 52 corresponds to the outer ring 461 of the bearing 46, so as to axially limit the bearing 46.

[0030] The above design can make the bearing 46 fixed and clamped by cooperation of the brake 4 and the first housing 5 when the bearing 46 is installed in the servo motor, and it is not necessary to additionally configure a pressing plate for fixing the bearing 46, thereby saving the internal space of the servo motor.

[0031] In summary, the brake of the servo motor is improved, the bearing is fixed during assembly, the pressing plate structure in the existing servo motor is cancelled, the internal space of the servo motor is saved, and the bearing is convenient to install. Overall, the structure of the servo motor is more compact, the length of the servo motor is reduced, and the production difficulty and cost are reduced.

[0032] Although the utility model has been disclosed as above with embodiments, it is not used to limit the utility model, anyone with ordinary knowledge in the art can make some changes and decorations without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model is defined by the appended patent application scope.

Claims

1. An electric machine brake with a pressure bearing structure, characterized in that The brake comprises, A magnetic yoke, one end of the magnetic yoke is provided with a containing groove in the center, and a pressing bearing part is arranged on the bottom wall of the containing groove; A bearing is installed in the containing groove, and the pressing bearing part axially limits the bearing.

2. The motor brake with a pressure bearing structure according to claim 1, wherein A containing space is formed between the inner wall of the containing groove and the outer edge of the bearing to install a stepped structure on the first shell.

3. The motor brake with a pressure bearing structure according to claim 1, wherein The bearing comprises an inner ring and an outer ring, the inner ring is coaxially arranged inside the outer ring, the outer ring is in axial contact with the pressing bearing part, and the inner ring is sleeved on the motor shaft.

4. The motor brake with a pressure bearing structure according to claim 2, wherein A first through hole is arranged on the bottom wall of the containing groove to pass through the motor shaft.

5. The motor brake with a pressure bearing structure according to claim 1, wherein The brake further comprises a lower armature, an upper armature, a friction disc and a shaft sleeve, the lower armature is axially connected with the magnetic yoke through a spring, the upper armature is axially fixedly connected with the magnetic yoke through a screw, the lower armature is arranged axially between the upper armature and the magnetic yoke, the friction disc is coaxially installed between the upper armature and the lower armature, and the shaft sleeve is coaxially installed in the friction disc.

6. A servo motor comprising a motor shaft, a rotor-stator assembly, a second housing, the rotor-stator assembly being coaxially mounted in the second housing, the rotor-stator assembly being coaxially sleeved on the motor shaft, both ends of the motor shaft extending out of the second housing, characterized in that, The servo motor further comprises the brake according to any one of claims 1-5, the brake is coaxially sleeved on the motor shaft; a first shell, the first shell and the second shell are axially fixedly connected, and the brake is coaxially installed in the first shell.

7. The servomotor of claim 6, wherein An axially protruding stepped structure is arranged in the shell to radially limit the bearing.

8. The servomotor of claim 7, wherein, A bearing positioning groove is formed on the inner side of the stepped structure to limit the bearing.

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