Motor with brake function and electric push rod

Abstract

The utility model discloses a motor with a brake function and an electric push rod, which comprise a motor, a rear cover, a base, an electromagnet and a brake pad, the motor is provided with an output shaft, the rear cover is arranged at the rear end of the motor, the rear end of the output shaft extends into the rear cover, the base is fixedly arranged in the rear cover, the electromagnet is arranged in the base, the brake pad is arranged in the rear cover, and the brake pad is arranged in the rear cover. In the normal working state, the brake pad and the base are spaced, in the braking state, the brake pad floats under the magnetic force effect of the electromagnet and is attached to the base, rotation of the brake pad is limited through friction resistance between the brake pad and the base, and therefore the output shaft fixedly connected with the brake pad in the rotating direction is stopped through the brake pad. And when the brake pad rotates along with the output shaft, the peripheral side of the brake pad does not make contact with the inner wall of the shell, noise generated by friction is avoided, it is ensured that the brake pad provides reliable braking force, and the braking effect on the output shaft is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic devices, in particular to a motor and an electric push rod with a braking function. Background Art

[0002] Conventional electric push rods generally adopt a torsion spring braking method. When the motor shaft rotates forward, the acting force between the torsion spring and the motor shaft is small and does not affect the operation of the motor. When the electric push rod needs to retract, the motor shaft rotates reversely, driving the two free ends of the torsion spring to tighten, thereby achieving a braking effect.

[0003] However, when such an electric push rod with a braking function is working normally, there is still a certain amount of friction between the torsion spring and the motor shaft, which is likely to generate noise, and the braking force of the torsion spring is not very stable, resulting in a poor braking effect. Summary of the Utility Model

[0004] In view of this, the utility model provides a motor and an electric push rod with a braking function, which are used to solve the problems that when an electric push rod with a braking function in the prior art is working normally, there is still a certain amount of friction between the torsion spring and the motor shaft, which is likely to generate noise, and the braking force of the torsion spring is not very stable, resulting in a poor braking effect.

[0005] To achieve one or part or all of the above purposes or other purposes, the utility model provides a motor with a braking function, including a motor, a rear cover, a base, an electromagnet and a brake pad. The motor is provided with an output shaft. The rear cover is fixedly covered on the rear end face of the motor, and the rear end of the output shaft extends into the rear cover. The base is fixedly arranged in the rear cover. The electromagnet is installed in the base. The brake pad is arranged in the rear cover, and the brake pad rotates with the output shaft in the rotational direction and is floatingly connected to the output shaft in the axial direction. In the normal working state, the brake pad is spaced from the base. In the braking state, the brake pad floats under the magnetic force of the electromagnet and fits with the base.

[0006] Preferably, the base is close to the rear end face of the motor. A plurality of mounting screw holes are provided on one side wall of the base close to the motor. A plurality of through holes corresponding to the mounting screw holes one by one are provided on the rear end wall of the motor. Screws are sleeved in the through holes, and the tips of the screws are screwed into the corresponding mounting screw holes.

[0007] Preferably, the base is arranged close to the rear end face of the motor. The brake pad is located on the side of the base away from the motor, and both the base and the brake pad are coaxially sleeved on the output shaft. The output shaft is rotatably connected to the base.

[0008] Preferably, the electromagnet is an electromagnetic coil, and the electromagnetic coil is coaxially embedded in the base.

[0009] Preferably, a first wire hole is axially provided on a side wall of the base close to the motor, a second wire hole corresponding to the first wire hole is provided on the rear end wall of the motor, and the wire of the electromagnetic coil sequentially passes through the first wire hole and the second wire hole into the interior of the motor.

[0010] Preferably, a fixing piece is further provided in the rear cover. The fixing piece is located on a side of the brake pad away from the base. The fixing piece is fixedly sleeved on the output shaft, and an elastic member is provided between the fixing piece and the brake pad.

[0011] Preferably, fastening screw holes are radially provided on the circumferential side of the fixing piece, and fastening screws are threadedly connected in the fastening screw holes.

[0012] Preferably, the elastic member is a spring piece. One side of the spring piece is fixedly connected to the fixing piece, and the other side of the spring piece is fixedly connected to the brake pad.

[0013] Preferably, a plurality of first connection points and a plurality of second connection points are alternately arranged in the circumferential direction on the spring piece. The plurality of first connection points are fixedly connected to the fixing piece, and the plurality of second connection points are fixedly connected to the brake pad.

[0014] An electric push rod includes a motor with a braking function, a housing, a lead screw, and a nut. The housing is fixedly arranged at the front end of the motor. One end of the lead screw is rotatably connected to the housing and is arranged in a direction perpendicular to the output shaft. The output shaft is drivingly connected to the lead screw, and the nut is threadedly connected to the exposed end of the lead screw.

[0015] Implementing the embodiments of the present invention will have the following beneficial effects:

[0016] After adopting the above-mentioned motor with a braking function and the electric push rod, during use, the motor can drive the output shaft to rotate. In the normal working state, the brake pad is spaced from the base. In the braking state, the brake pad floats under the magnetic force of the electromagnet and fits with the base. The frictional resistance between the brake pad and the base will limit the rotation of the brake pad, thereby stopping the output shaft fixedly connected thereto in the rotation direction through the brake pad. Moreover, when the brake pad rotates with the output shaft, the circumferential side of the brake pad will not contact the inner wall of the housing, which not only avoids noise generated by friction but also is beneficial to the structural stability of the brake pad to ensure that the brake pad provides reliable braking force and improves the braking effect on the output shaft. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Wherein:

[0019] Figure 1 is the explosion diagram of the present invention Figure 1 ;

[0020] Figure 2 is the explosion diagram of the present invention Figure 2 ;

[0021] Figure 3 is the three-dimensional diagram of the present invention.

[0022] In the figure: 1. Motor; 11. Output shaft; 12. Through hole; 13. Second wire hole; 2. Rear cover; 3. Base; 31. Mounting screw hole; 32. First wire hole; 4. Electromagnet; 5. Brake pad; 6. Fixed plate; 61. Fastening screw hole; 7. Elastic member; 71. First connection point; 72. Second connection point; 81. Housing; 82. Lead screw; 83. Nut. Detailed implementation manners

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present invention or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0024] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0025] In order to enable those skilled in the technical field to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings.

[0026] As shown Figures 1-3 in the figure, a motor 1 with a braking function includes a motor 1, a rear cover 2, a base 3, an electromagnet 4 and a brake pad 5. The motor 1 is provided with an output shaft 11. The rear cover 2 is fixedly installed at the rear end of the motor 1 through screws and covers the rear end face of the motor 1. The rear end of the output shaft 11 extends into the rear cover 2. The base 3 is fixedly arranged in the rear cover 2. The electromagnet 4 is installed in the base 3. The brake pad 5 is arranged in the rear cover 2, and the brake pad 5 rotates with the output shaft 11 in the rotational direction and is floatingly connected to the output shaft 11 in the axial direction. During use, the motor 1 can drive the output shaft 11 to rotate. In the normal working state, the brake pad 5 is spaced from the base 3. In the braking state, the electromagnet 4 is energized, and the brake pad 5 floats under the magnetic force of the electromagnet 4 and fits with the base 3. The frictional resistance between the brake pad 5 and the base 3 will limit the rotation of the brake pad 5, so as to stop the output shaft 11 fixedly connected to it in the rotational direction through the brake pad 5. And when the brake pad 5 rotates with the output shaft 11, the circumferential side of the brake pad 5 will not contact the inner wall of the housing 81, which not only avoids generating noise due to friction, but also is beneficial to the structural stability of the brake pad 5 to ensure that the brake pad 5 provides reliable braking force and improves the braking effect on the output shaft 11.

[0027] Specifically, the utility model can be used as a power device for a hidden staircase and a hidden basement door, so that when the motor 1 fails or loses power, the screw rod 82 can be stopped by the suction of the brake pad 5 and the base 3, and the falling hidden staircase and hidden door can be stopped to prevent accidents.

[0028] Further, the base 3 is close to the rear end face of the motor 1. A plurality of mounting screw holes 31 are provided on the side wall of the base 3 close to the motor 1. A plurality of through holes 12 corresponding to the mounting screw holes 31 one by one are provided on the rear end wall of the motor 1. Screws are sleeved in the through holes 12, and the tips of the screws are screwed into the corresponding mounting screw holes 31 (not shown in the drawings), so that the base 3 is detachably fixed on the rear end face of the motor 1 through the screws.

[0029] Further, the base 3 is arranged close to the rear end face of the motor 1. The brake pad 5 is located on the side of the base 3 away from the motor 1, and both the base 3 and the brake pad 5 are coaxially sleeved on the output shaft 11, and the output shaft 11 is rotatably connected to the base 3.

[0030] Further, the electromagnet 4 is an electromagnetic coil, and the electromagnetic coil is coaxially embedded in the base 3.

[0031] Further, a first wire hole 32 is provided along the axial direction on one side wall of the base 3 close to the motor 1. A second wire hole 13 corresponding to the first wire hole 32 is provided on the rear end wall of the motor 1. The wire of the electromagnetic coil sequentially passes through the first wire hole 32 and the second wire hole 13 to the inside of the motor 1. The wire of the electromagnetic coil is electrically connected to the control main board, so that when the motor 1 is powered off or fails, the control main board can timely control the electromagnetic coil to be powered on, and use the cooperation of the brake pad 5 and the base 3 to brake and stop the lead screw 82.

[0032] Further, a fixing piece 6 is further provided inside the rear cover 2. The fixing piece 6 is located on the side of the brake pad 5 away from the base 3. The fixing piece 6 is fixedly sleeved on the output shaft 11. An elastic member 7 is provided between the fixing piece 6 and the brake pad 5.

[0033] In one embodiment, the elastic member 7 can be a spring. The brake pad 5 is slidably connected to the output shaft 11. When the brake pad 5 adsorbs to the end of the base 3, the spring deforms and stretches. When the magnetic attraction force disappears, the spring releases energy and retracts, and pulls the brake pad 5 away from the end of the base 3 (not shown in the drawings).

[0034] Further, a fastening screw hole 61 is provided along the radial direction on the circumferential side of the fixing piece 6. A fastening screw (not shown in the drawings) is threadedly connected to the fastening screw hole 61. During use, the fastening screw can be screwed in so that the tip of the fastening screw abuts against the side wall of the output shaft 11, thereby fixing the fixing piece 6 on the output shaft 11.

[0035] Further, the elastic member 7 is a spring piece. One side of the spring piece is fixedly connected to the fixing piece 6, and the other side of the spring piece is fixedly connected to the brake pad 5.

[0036] Further, a plurality of first connection points 71 and a plurality of second connection points 72 are alternately arranged along the circumferential direction on the spring piece. The plurality of first connection points 71 are fixedly connected to the fixing piece 6, and the plurality of second connection points 72 are fixedly connected to the brake pad 5. The fixed connection method can be welding or riveting. In this embodiment, riveting is preferably used so that the fixing piece 6 and the brake pad 5 are fixed in the rotational direction through the spring piece.

[0037] In this embodiment, when the electromagnetic coil is energized to generate a magnetic field to attract the brake pad 5, the area where the second connection point 72 of the spring piece is located can be adaptively deformed, so that the brake pad 5 floats axially along the output shaft 11 and fits with the end of the base 3, thereby braking and stopping the output shaft 11. When the electromagnetic coil is powered off and the magnetic attraction force disappears, the spring piece will release energy and reset, and drive the brake pad 5 to reset and separate from the end of the base 3 through the second connection point 72, releasing the rotation restriction on the output shaft 11.

[0038] An electric push rod includes a motor 1 with a braking function, a housing 81, a lead screw 82 and a nut 83. The housing 81 is fixedly arranged at the front end of the motor 1. One end of the lead screw 82 is rotatably connected to the housing 81 and is arranged along the vertical direction of the output shaft 11. The output shaft 11 is drivingly connected to the lead screw 82. The nut 83 is threadedly connected to the exposed end of the lead screw 82. The output shaft 11 can drive the lead screw 82 to rotate through the transmission of a worm and a turbine, and the thread of the lead screw 82 is used to drive the nut 83 to translate along its axial direction, so as to push a moving part fixedly connected to the nut 83 to move.

[0039] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. The drawings show the preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is similarly within the scope of the patent protection of the present invention.

Claims

1. A motor with a brake function, characterized in that: include: Motor, back cover, base, electromagnet and brake pads; The motor is provided with an output shaft, the rear cover is fixedly covered on the rear end surface of the motor, and the rear end of the output shaft extends into the rear cover; The base is fixedly arranged in the back cover; The electromagnet is installed in the base; The brake pad is arranged in the rear cover, and the brake pad rotates with the output shaft in the rotation direction, and is floatingly connected with the output shaft in the axial direction; In a normal working state, the brake pad is spaced apart from the base, and in a braking state, the brake pad floats under the magnetic force of the electromagnet and fits with the base.

2. A motor with a brake function according to claim 1, characterized in that: The base is close to the rear end face of the motor, and a plurality of mounting screw holes are provided on a side wall of the base close to the motor. A plurality of through holes are provided on the rear end wall of the motor corresponding to the mounting screw holes, and screws are sleeved in the through holes, and the tips of the screws are screwed into the corresponding mounting screw holes.

3. The motor with brake function according to claim 1, characterized in that: The base is arranged close to the rear end surface of the motor, the brake pad is located on the side of the base away from the motor, and the base and the brake pad are coaxially sleeved on the output shaft, and the output shaft is rotatably connected to the base.

4. The motor with brake function according to claim 3, characterized in that: The electromagnet is an electromagnetic coil, and the electromagnetic coil is coaxially embedded in the base.

5. The motor with brake function according to claim 4, characterized in that: A first wiring hole is provided on a side wall of the base close to the motor along its axial direction, and a second wiring hole is provided on the rear end wall of the motor corresponding to the first wiring hole. The wires of the electromagnetic coil pass through the first wiring hole and the second wiring hole in sequence to the inside of the motor.

6. The motor with brake function according to claim 4, characterized in that: A fixing plate is also arranged in the rear cover. The fixing plate is located at a side of the brake pad away from the base. The fixing plate is fixedly sleeved on the output shaft. An elastic member is arranged between the fixing plate and the brake pad.

7. The motor with brake function according to claim 6, characterized in that: A fastening screw hole is provided on the circumferential side of the fixing plate along its radial direction, and a fastening screw is threadedly connected to the inner thread of the fastening screw hole.

8. The motor with brake function according to claim 6, characterized in that: The elastic member is a spring sheet, one side of the spring sheet is fixedly connected to the fixing sheet, and the other side of the spring sheet is fixedly connected to the brake pad.

9. The motor with brake function according to claim 8, characterized in that: A plurality of first connection points and a plurality of second connection points are alternately arranged on the spring sheet along the circumferential direction, a plurality of the first connection points are fixedly connected to the fixing sheet, and a plurality of the second connection points are fixedly connected to the brake pad.

10. An electric push rod, characterized in that: The motor with brake function comprises the motor with brake function as claimed in any one of claims 1 to 9, as well as a housing, a screw rod and a nut; The housing is fixedly arranged at the front end of the motor, one end of the screw is rotatably connected to the housing and arranged along the vertical direction of the output shaft, the output shaft is drivingly connected to the screw, and the nut is threadedly connected to the exposed end of the screw.

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