Braking mechanism and tubular motor

Abstract

The application discloses a brake mechanism and a tubular motor applying the brake mechanism, and the brake mechanism comprises a first transmission part, a second transmission part and a torsional spring, wherein a first body of the first transmission part is in transmission connection with a driving part, a second body of the second transmission part is in rotation connection with the first body, an output part is connected with the second body, a body of the torsional spring is elastically sleeved with the first body, and a brake part is located between the first transmission part and the second transmission part. The brake mechanism has good brake performance, can effectively avoid the slipping phenomenon of the tubular motor due to the excessive external load, and has better brake effect and more stable use performance.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a braking mechanism and a tubular motor. Background Technology

[0002] Tubular motors, as drive devices, are commonly used in electric roller shutters, roller windows, garage doors, awnings, and other equipment. Traditional tubular motors are widely used due to their compact structure, high torque, and slow speed. A traditional tubular motor mainly consists of a drive source and a power transmission device, and some may also include a reduction gear and other auxiliary devices. However, in practical implementation, traditional tubular motors still have a series of structural design flaws, specifically: When the power to the traditional tubular motor is cut off, the rotor of its drive source and the power transmission device, after high-speed operation, will continue to rotate due to inertia. In addition, the weight of the roller shutter or other equipment carried by the tubular motor will also drive the power transmission device and the rotor of the drive source to rotate. This causes the roller shutter or other equipment carried by the traditional tubular motor to slide down due to its own weight and the motor's inertia after the power is cut off, resulting in inaccurate stopping and positioning of the roller shutter, thus negatively impacting the reliability and safety of the traditional tubular motor.

[0003] In related technologies, the braking of tubular motors is mainly achieved through the motor's own rotor, which has a poor braking effect. When the load at the output end is too large, the tubular motor will experience "slippage," that is, the rotor rotates relative to the stator, resulting in poor performance of the tubular motor. Summary of the Invention

[0004] The main objective of this invention is to provide a braking mechanism that improves the braking effect and performance of tubular motors.

[0005] To achieve the above objectives, the present invention proposes a braking mechanism applied to a tubular motor, the tubular motor including a driving unit and an output unit, the braking mechanism comprising:

[0006] The first transmission component includes a first body and a first transmission part connected to the first body, and the first body is throttle connected to the drive part;

[0007] A second transmission component, comprising a second body and a second transmission part connected to the second body, the second body being rotatably connected to the first body, and the output part being connected to the second body; and

[0008] At least one torsion spring, the torsion spring including a torsion spring body and a braking part connected to the end of the torsion spring body, the torsion spring body being elastically sleeved on the first body, and the braking part being located between the first transmission part and the second transmission part;

[0009] The braking mechanism has a braking state and a transmission state. When in the transmission state, the first transmission part abuts against the braking part so that the torsion spring body expands against the elastic force and drives the torsion spring body and the second transmission part to rotate.

[0010] When in a braking state, the second transmission part can abut against the braking part, so that the torsion spring body contracts in the direction of elastic force and elastically abuts against the outer side of the first body.

[0011] Optionally, the first transmission part includes two first transmission flanges, which are spaced apart circumferentially along the first body; the second transmission part includes two second transmission flanges, which are spaced apart circumferentially along the second body; and the braking part includes two braking sections, which are located at opposite ends of the torsion spring.

[0012] The second body is rotatably connected to the first body, and the two first transmission flanges and the two second transmission flanges are arranged in an alternating manner. The braking section is located between an adjacent first transmission flange and a second transmission flange.

[0013] Optionally, the first body and the first transmission part are integrally formed, and the second body and the second transmission part are integrally formed.

[0014] Optionally, the braking mechanism includes a plurality of torsion springs, the plurality of torsion spring bodies being spaced apart along the axial direction of the first body.

[0015] Optionally, the braking mechanism further includes a connecting shaft. The first body has a first shaft hole that penetrates its two opposite surfaces, and the second body has a second shaft hole that penetrates its two opposite surfaces. The connecting shaft passes through the first shaft hole and the second shaft hole, and rotatably connects the second body to the first body.

[0016] The present invention also proposes a tubular motor, including the braking mechanism described above.

[0017] Optionally, the tubular motor includes a drive unit and an output unit, and the braking mechanism includes:

[0018] The first transmission component includes a first body and a first transmission part connected to the first body, and the first body is throttle connected to the drive part;

[0019] A second transmission component, comprising a second body and a second transmission part connected to the second body, the second body being rotatably connected to the first body, and the output part being connected to the second body; and

[0020] At least one torsion spring, the torsion spring including a torsion spring body and a braking part connected to the end of the torsion spring body, the torsion spring body being elastically sleeved on the first body, and the braking part being located between the first transmission part and the second transmission part;

[0021] The braking mechanism has a braking state and a transmission state. When in the transmission state, the driving part drives the first transmission part to abut against the braking part, so that the torsion spring body expands against the elastic force and drives the torsion spring body and the second transmission part to rotate.

[0022] When in a braking state, the second transmission part can abut against the braking part, so that the torsion spring body contracts in the direction of elastic force and elastically abuts against the outer side of the first body.

[0023] Optionally, the drive unit includes a drive motor, a primary speed change mechanism, and a connecting bushing. The primary speed change mechanism is driven by the drive motor, the connecting bushing is connected to the primary speed change mechanism, and the first body is detachably connected to the connecting bushing.

[0024] Optionally, the connecting bushing has a connecting protrusion protruding on one side facing the first body, and the first body has an insertion hole, into which the connecting protrusion is inserted.

[0025] Optionally, the output unit includes a two-stage transmission mechanism and an output shaft, the two-stage transmission mechanism being connected to the second body, and the output shaft being connected to the two-stage transmission mechanism. Theme Two, ...

[0026] The braking mechanism in the technical solution of the present invention includes a first transmission component, a second transmission component, and a torsion spring. The first body of the first transmission component is throttlely connected to the driving part, the second body of the second transmission component is rotatably connected to the first body, the output part is connected to the second body, the torsion spring body is elastically sleeved on the first body, and the braking part is located between the first transmission part and the second transmission part.

[0027] In one embodiment of the present invention, the braking mechanism has a braking state and a transmission state. In the transmission state, the driving unit drives the first body and drives the first transmission unit to rotate. The first transmission unit rotates and abuts against the braking unit. The braking unit drives the torsion spring body to rotate relative to the first body and expands against its own elastic force, thereby driving the torsion spring body and the second transmission unit to rotate, so that the output unit moves against the external load. In the braking state, since the second body is connected to the output unit and the output unit is connected to the external load, under the action of the external load, the second body will drive the second transmission unit to move in the opposite direction driven by the driving unit. At this time, the second transmission unit abuts against the opposite side of the braking unit and drives the torsion spring body to move in the direction of its elastic force, so that the torsion spring body contracts and elastically abuts against the outer side of the first body. The greater the external load, the greater the amount of contraction of the torsion spring body, and the greater the friction between the torsion spring body and the outer side of the first body. This can effectively avoid the slippage phenomenon of the tubular motor due to excessive external load, and the braking effect of the tubular motor is better and the performance is more stable. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of the tubular motor of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the internal structure of the tubular motor shown;

[0031] Figure 3 for Figure 2 Enlarged detail view of point A in the middle;

[0032] Figure 4 for Figure 2 The diagram shown is an exploded view of the tubular motor.

[0033] Figure 5 for Figure 2 A top view of the tubular motor shown;

[0034] Figure 6 for Figure 2 The diagram shows a cross-sectional view of the tubular motor along the VV direction.

[0035] Explanation of icon numbers:

[0036]

[0037]

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0041] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0042] Reference Figures 1 to 6 The present invention proposes a braking mechanism 10.

[0043] In this embodiment of the invention, the braking mechanism 10 is applied to a tubular motor 100, which includes a drive unit 20 and an output unit 30. The braking mechanism 10 includes a first transmission member 11, a second transmission member 12, and a torsion spring 13. The first body 111 of the first transmission member 11 is tractively connected to the drive unit 20, the second body 121 of the second transmission member 12 is rotatably connected to the first body 111, the output unit 30 is connected to the second body 121, the torsion spring body 131 is elastically sleeved on the first body 111, and the braking unit is located between the first transmission member and the second transmission member.

[0044] Specifically, in one embodiment of the present invention, the drive unit 20 of the tubular motor 100 includes a drive motor 21, a primary speed change mechanism 22, and a connecting bushing 23. The drive motor 21 can be a servo motor or a stepper motor. The primary speed change mechanism 22 is connected to the drive motor 21 and includes multiple planetary gears. These planetary gears are configured and connected to the output shaft 32 of the drive motor 21 to change the output speed and torque of the drive motor 21. The structure and working principle of the primary speed change mechanism 22 are relatively mature technologies and will not be described in detail here. The connecting bushing 23 is connected to the primary speed change mechanism 22. The drive motor 21 drives the primary speed change mechanism 22 to rotate, thereby causing the connecting bushing 23 to rotate. The output unit 30 includes a secondary speed change mechanism 31 and an output shaft 32. The structure and working principle of the secondary speed change mechanism 31 can be referred to that of the primary speed change mechanism 22 and will not be described in detail here. The output shaft 32 is connected to the secondary speed change mechanism 31 and is connected to an external load.

[0045] In one embodiment of the present invention, a braking mechanism 10 is disposed between the drive unit 20 and the output unit 30, for driving the output unit 30 to rotate, or for preventing the external load of the output unit 30 from driving the drive unit 20 to rotate in a stationary state, thereby ensuring the stable performance of the tubular motor 100 and protecting the first-stage transmission mechanism 22 and the second-stage transmission mechanism 31. Specifically, the braking mechanism 10 has a braking state and a transmission state. In the transmission state, the drive unit 20 drives the first body 111 and drives the first transmission unit to rotate. The first transmission unit rotates and abuts against the braking unit. The braking unit drives the torsion spring body 131 to rotate relative to the first body 111 and expands against its own elasticity, thereby driving the torsion spring body 131 and the second transmission unit to rotate, so that the output unit 30 moves against the external load. When in braking state, since the second body 121 is connected to the output part 30, and the output part 30 is connected to the external load, under the action of the external load, the second body 121 will drive the second transmission part to move in the opposite direction of the drive part 20. At this time, the second transmission part abuts against the opposite side of the braking part and drives the torsion spring body 131 to move in its elastic direction, so that the torsion spring body 131 contracts and elastically abuts against the outer side of the first body 111. The greater the external load, the greater the amount of contraction of the torsion spring body 131, and the greater the friction between the torsion spring body 131 and the outer side of the first body 111. In this way, the slippage phenomenon caused by excessive external load of the tubular motor 100 can be effectively avoided, the braking effect of the tubular motor 100 is better, and the performance is more stable.

[0046] Please see again Figures 4 to 6Specifically, the first transmission part includes two first transmission flanges, which are spaced apart circumferentially along the first body 111; the second transmission part includes two second transmission flanges, which are spaced apart circumferentially along the second body 121; the braking part includes two braking sections, which are located at opposite ends of the torsion spring 13; wherein the first body 111 and the second body 121 are cylindrical in shape; the first transmission flanges and the second transmission flanges are protrusions on the edges of the first body 111 and the second body 121 and extend circumferentially thereon; the first transmission flanges and the second transmission flanges are integrally formed with the first body 111 and the second body 121, respectively; thus, the manufacturing of the first transmission component 11 and the second transmission component 12 is more convenient, and the assembly of the braking mechanism 10 is also convenient. After actual assembly, the second body 121 is rotatably connected to the first body 111. The two first transmission flanges and the two second transmission flanges are staggered, forming four gaps. The two braking sections at both ends of the torsion spring body 131 are formed by bending the ends of the torsion spring body 131. The two braking sections extend into one gap respectively.

[0047] Please see again Figure 3 To facilitate the explanation of the working principle of the braking mechanism 10, the two braking sections of the torsion spring 13 are defined as the first braking section 1321 and the second braking section 1322. Under the drive of the drive motor 21, the first flange 112 rotates in the first direction. At this time, the first flange 112 first abuts against the first braking section 1321 and drives the torsion spring body 131 to rotate relative to the first body 111. Since there is a certain friction between the torsion spring body 131 and the first body 111, the direction of rotation of the torsion spring body 131 is opposite to the direction of its own elastic force. Therefore, the torsion spring body 131 will expand and then rotate with the first body 111, and abut against the second flange 122. The second flange 122 drives the second body 121 to rotate, thereby causing the output shaft 32 to rotate. When stationary, under the action of an external load, the second flange 122 will rotate in the second direction. The second flange 122 will first abut against the opposite side of the first braking section 1321. At this time, the rotation direction of the torsion spring body 131 is the same as the direction of its own elastic force. Therefore, the torsion spring body 131 will further contract and firmly clamp against the outer side of the first body 111, thereby restricting the rotation of the second flange 122 to avoid the tubular motor 100 slipping under the action of external load.

[0048] In another operating condition, driven by the drive motor 21, the first flange 112 rotates in the second direction. At this time, the first flange 112 first abuts against the second braking section 1322 and drives the torsion spring body 131 to rotate relative to the first body 111, causing the torsion spring body 131 to expand and then rotate with the first body 111. In the stationary state, if an external load is applied, the second flange 122 will rotate in the first direction. The second flange 122 will first abut against the opposite side of the second braking section 1322. At this time, the direction of rotation of the torsion spring body 131 is the same as the direction of its own elastic force. Therefore, the torsion spring body 131 will further contract and firmly clamp against the outer side of the first body 111, thereby restricting the rotation of the second flange 122 to avoid slippage of the tubular motor 100 under the action of external load.

[0049] As can be seen from the above process, the braking mechanism 10 of this application can effectively brake the tubular motor 100 by using the characteristics of the torsion spring 13. By setting two braking sections, the tubular motor 100 can be guaranteed to operate stably whether it rotates forward or backward. The structure is simple and the braking effect is good.

[0050] In one embodiment of the present invention, the braking mechanism 10 includes a plurality of torsion springs 13, the plurality of torsion spring bodies 131 being spaced apart along the axial direction of the first body 111. By providing a plurality of torsion springs 13, the braking effect of the braking mechanism 10 can be greatly improved, further enhancing the operational stability of the tubular motor 100.

[0051] In one embodiment of the present invention, the braking mechanism 10 further includes a connecting shaft 14. The first body 111 has a first shaft hole 111a penetrating its two opposite surfaces, and the second body 121 has a second shaft hole 121a penetrating its two opposite surfaces. The connecting shaft 14 passes through the first shaft hole 111a and the second shaft hole 121a, rotatably connecting the second body 121 to the first body 111. In the present invention, the connecting shaft 14 also passes through the connecting bushing 23 and the output shaft 32. This not only connects the braking mechanism 10, the drive unit 20, and the output unit 30, but also improves the coaxiality after connection, making the output power of the tubular motor 100 more stable.

[0052] The present invention also proposes a tubular motor 100, which includes a drive unit 20, an output unit 30, and a braking mechanism 10. The specific structure of the braking mechanism 10 is as described in the above embodiments. Since the tubular motor 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The braking mechanism 10 includes: a first transmission member 11, which includes a first body 111 and a first transmission part connected to the first body 111, and the first body 111 is throttlely connected to the drive unit 20; a second transmission member 12, which includes a second body 121 and a second transmission part connected to the second body 121, the second body 121 being rotatably connected to the first body 111, and the output unit 30 being connected to the second body 121; and at least one torsion spring 13, which includes a torsion spring body 131 and a braking part connected to the end of the torsion spring body 131. The driving part, wherein the torsion spring body 131 is elastically sleeved on the first body 111, and the braking part is located between the first transmission part and the second transmission part; the braking mechanism 10 has a braking state and a transmission state. When in the transmission state, the driving part 20 drives the first transmission part to abut against the braking part, so that the torsion spring body 131 expands against the elastic force and drives the torsion spring body 131 and the second transmission part to rotate; when in the braking state, the second transmission part can abut against the braking part, so that the torsion spring body 131 contracts along the elastic force direction and elastically abuts against the outer side of the first body 111.

[0053] In one embodiment of the present invention, the connecting bushing 23 has a connecting protrusion 231 protruding from the side facing the first body 111. The cross-section of the connecting protrusion 231 is polygonal. The first body 111 has an insertion hole 111b, which also has a polygonal cross-section. The connecting protrusion 231 is inserted into the insertion hole 111b to connect the connecting bushing 23 and the first body 111. This connection structure between the connecting bushing 23 and the first body 111 is simple and can prevent relative sliding between the connecting bushing 23 and the first body 111 during transmission, thereby ensuring the output power of the tubular motor 100.

[0054] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A braking mechanism applied to a tubular motor, the tubular motor comprising a driving section and an output section, characterized in that, The braking mechanism includes: The first transmission component includes a first body and a first transmission part connected to the first body, and the first body is throttle connected to the drive part; A second transmission component, comprising a second body and a second transmission part connected to the second body, the second body being rotatably connected to the first body, and the output part being connected to the second body; and At least one torsion spring, the torsion spring including a torsion spring body and a braking part connected to the end of the torsion spring body, the torsion spring body being elastically sleeved on the first body, and the braking part being located between the first transmission part and the second transmission part; The braking mechanism has a braking state and a transmission state. When in the transmission state, the first transmission part abuts against the braking part so that the torsion spring body expands against the elastic force and drives the torsion spring body and the second transmission part to rotate. When in a braking state, the second transmission part can abut against the braking part, causing the torsion spring body to contract along the elastic force direction and elastically abut against the outer side of the first body; the first transmission part includes two first transmission flanges, which are spaced apart circumferentially along the first body; the second transmission part includes two second transmission flanges, which are spaced apart circumferentially along the second body; the braking part includes two braking sections, which are located at opposite ends of the torsion spring; the output part is connected to an external load; the second body will drive the second transmission part to move in the opposite direction of the drive part; the second transmission part abuts against the opposite side of the braking part and drives the torsion spring body to move along its elastic force direction, causing the torsion spring body to contract and elastically abut against the outer side of the first body; The second body is rotatably connected to the first body, and the two first transmission flanges and the two second transmission flanges are arranged in an alternating manner. One of the braking sections is located between an adjacent first transmission flange and a second transmission flange. The braking mechanism further includes a connecting shaft. The first body has a first shaft hole that penetrates its two opposite surfaces, and the second body has a second shaft hole that penetrates its two opposite surfaces. The connecting shaft passes through the first shaft hole and the second shaft hole, rotatably connecting the second body to the first body. The first body and the first transmission part are integrally formed, and the second body and the second transmission part are integrally formed. The braking mechanism includes a plurality of torsion springs, and the plurality of torsion spring bodies are spaced apart along the axial direction of the first body.

2. A tubular motor, characterized in that, It includes a drive unit, an output unit, and a braking mechanism as described in claim 1.

3. The tubular motor as described in claim 2, characterized in that, The drive unit includes a drive motor, a primary speed change mechanism, and a connecting bushing. The primary speed change mechanism is driven by the drive motor, and the connecting bushing is connected to the primary speed change mechanism. The first body is detachably connected to the connecting bushing.

4. The tubular motor as described in claim 3, characterized in that, The connecting bushing has a connecting protrusion protruding on one side facing the first body, and the first body has a plug hole, into which the connecting protrusion is plugged.

5. The tubular motor as described in claim 2, characterized in that, The output section includes a two-stage speed change mechanism and an output shaft. The two-stage speed change mechanism is connected to the second body, and the output shaft is connected to the two-stage speed change mechanism.

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