Tubular motor brake device and tubular motor

Abstract

The utility model discloses a tubular motor brake device and a tubular motor, and the device comprises an input part which comprises a first disc body and a first flange formed on the first disc body; the output component comprises a second disc body and a second flange formed on the second disc body; the spiral spring, the first flange and the second flange extend into the spiral spring, when the first flange is matched with the spiral spring, the spiral spring shrinks inwards in the radial direction, and when the second flange is matched with the spiral spring, the spiral spring expands outwards in the radial direction; the friction part is located on the periphery of the spiral spring and abuts against the spiral spring in the radial direction so as to provide braking friction force for the spiral spring; the input component further comprises a first pipe fitting, the output component further comprises a second pipe fitting, the second pipe fitting and the first pipe fitting extend in the axial direction of the tubular motor, one of the two pipe fittings penetrates through the other pipe fitting, one end of the outer side pipe fitting abuts against the disc body corresponding to the inner side pipe fitting, and the other end of the outer side pipe fitting abuts against the end of the inner side pipe fitting.

Description

Technical Field

[0001] This utility model relates to power devices, and more particularly to a tubular motor braking device, and a tubular motor using the braking device. Background Technology

[0002] Existing tubular motors typically include a stroke head, motor core, braking device, and reduction gear.

[0003] A commonly used braking device typically includes an input component, an output component, a coil spring, and a friction component. The coil spring is radially compressed inward by the force of the friction component. Lugs extending radially inward from both ends of the coil spring are formed. The input and output components abut against opposite sides of these lugs. Rotation of the input and output components causes the coil spring to rotate in opposite directions. The input component causes the inner diameter of the coil spring to tend to decrease, thereby reducing the friction with the friction component and allowing the coil spring and output component to rotate. Conversely, rotation of the output component causes the inner diameter of the coil spring to tend to increase, thereby increasing the friction with the friction component and stopping the coil spring in its fixed position.

[0004] Due to manufacturing and assembly errors, the axial position of the input and output components cannot be guaranteed, resulting in axial movement or axial position deviation. When the errors accumulate to a certain extent, the flanges of the input and / or output components may fail to engage with the lugs of the coil spring, thus rendering the braking device unusable. Therefore, existing technologies typically require technical means to stabilize the axial position of the input and output components. For example, Chinese Patent Application No. 201980070472.5 discloses an electromechanical actuator that includes a motor, a reducer, and a spring brake. The spring brake includes at least a coil spring, a drum, an input component, an output component, and a cap.

[0005] The aforementioned prior art uses a cap to axially press the input and output components together. However, this method requires an additional cap, which not only increases costs but also hinders motor miniaturization. Furthermore, because the output component has a solid first shaft, this braking device cannot be applied to motors with dual output shafts.

[0006] Therefore, further improvements are needed. Utility Model Content

[0007] The first technical problem to be solved by this utility model is to provide a tubular motor braking device that simplifies the structure and reduces the cost, in order to address the shortcomings of the existing technology.

[0008] The second technical problem to be solved by this utility model is to provide a tubular motor that incorporates the above-mentioned braking device.

[0009] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a tubular motor braking device, comprising:

[0010] An input component for receiving torque includes a first disc body and a first flange formed on the first disc body, the first flange extending from the first disc body toward a second disc body.

[0011] An output component for outputting torque includes a second disc body and a second flange formed on the second disc body, the second flange extending from the second disc body toward the first disc body;

[0012] A helical spring, wherein a first flange and a second flange extend into the helical spring; when the first flange engages with the helical spring, the helical spring contracts radially inward; and when the second flange engages with the helical spring, the helical spring expands radially outward.

[0013] A friction component, located on the outer periphery of a helical spring and radially abutting against it, provides a braking frictional force to the helical spring; characterized in that:

[0014] The input component further includes a first tube, and the output component further includes a second tube. Both the second tube and the first tube extend axially along the tubular motor. One of the first tube and the second tube passes through the other of the first tube and the second tube. One end of the outer tube directly or indirectly abuts against the disc corresponding to the inner tube, and the other end of the outer tube directly or indirectly abuts against the end of the inner tube.

[0015] By utilizing the components of the braking device itself, tubular parts are formed on its input and output parts respectively, and one of the tubular parts of the input and output parts is axially limited by the other of the input and output parts. This eliminates the need for separate axial limiting components, and the axial limiting is achieved by the input and output parts themselves, thereby simplifying the structure and reducing costs.

[0016] Preferably, the second pipe passes through the first pipe, one end of the first pipe directly or indirectly abuts against the second disc, and the other end of the first pipe directly or indirectly abuts against the end of the second pipe facing the first disc.

[0017] According to one aspect of the present invention, a first pipe and a second pipe are indirectly abutted together. The outer peripheral wall of the end of the second pipe facing the input component has an annular groove. The braking device further includes a retaining spring, which is at least partially engaged in the groove and protrudes from the outer peripheral wall of the second pipe. The first pipe abuts against the second pipe by abutting against the retaining spring.

[0018] According to another aspect of the present invention, the first pipe and the second pipe are in direct contact, and the end of the second pipe facing the input component has an annular protrusion, the outer diameter of which is larger than that of the second pipe, and the end of the first pipe abuts against the protrusion.

[0019] To facilitate the deformation of the second pipe fitting through the first pipe fitting so that its end can abut against the first pipe fitting, the second pipe fitting is provided with a notch, which is formed by the indentation of the end of the second pipe fitting toward the input component in a direction away from the input component.

[0020] Preferably, at least one end of the helical spring forms a lug extending radially inward into the helical spring, and the first flange of the input component and the second flange of the output component are respectively located on opposite sides of the same lug and selectively abut against the lug.

[0021] The first technical solution adopted by this utility model to solve the second technical problem mentioned above is: a tubular motor, including a motor body and a reduction gear, characterized in that: the braking device as described above is disposed inside the reduction gear, between the motor body and the reduction gear, or between the reduction gear and the output end of the tubular motor.

[0022] To facilitate the fixing of the friction components, the tubular motor also includes an outer tube, and the speed reduction device, braking device and motor body are disposed inside the outer tube, with the friction components fixed relative to the outer tube.

[0023] Preferably, the deceleration device includes at least two deceleration stages, and the braking device is disposed between two adjacent deceleration stages.

[0024] The second technical solution adopted by this utility model to solve the second technical problem mentioned above is: a tubular motor, including a motor body and a reduction gear, characterized in that: the braking device as described above is disposed inside the reduction gear, between the motor body and the reduction gear, or between the reduction gear and the output end of the tubular motor;

[0025] The tubular motor also includes an outer tube, and the speed reduction device, braking device and motor body are disposed inside the outer tube;

[0026] The motor body includes a rotor and an output shaft, which serves as the output end of a tubular motor. The output shaft passes through the rotor and can rotate relative to the rotor. The rotor is connected to a reduction gear. One axial end of the output shaft exits through the outer tube, and the other axial end of the output shaft passes through the reduction gear and exits through the outer tube. The output shaft also passes through the second tube and can rotate relative to the second tube. By utilizing the hollow tube in the brake device, the brake device and the dual-output motor are adapted, thereby expanding the applicability of the brake device.

[0027] Compared with the prior art, the advantages of this utility model are as follows: by utilizing the components of the braking device itself, tubular parts are formed on its input and output parts respectively, and one of the tubular parts of the input and output parts is axially limited by the other of the input and output parts, so that there is no need to set up a separate axial limiting component, but to use the input and output parts themselves to achieve axial limiting, thereby simplifying the structure and reducing costs; by using the hollow tubular parts in the braking device, the braking device and the dual-output motor are adapted, thereby expanding the application range of the braking device. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the tubular motor of this utility model;

[0029] Figure 2 This is a cross-sectional view of the tubular motor according to the first embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the braking device of the tubular motor according to the first embodiment of the present utility model;

[0031] Figure 4 This is a cross-sectional view of the braking device of the tubular motor according to the first embodiment of the present invention;

[0032] Figure 5 This is an exploded view of the braking device of the tubular motor according to the first embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the input component of the braking device of the tubular motor according to the first embodiment of the present invention;

[0034] Figure 7 This is a cross-sectional view of the braking device of the tubular motor according to the second embodiment of the present invention;

[0035] Figure 8 This is an exploded view of the braking device of the tubular motor according to the second embodiment of the present invention. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] Example 1

[0039] See Figures 1-6 A tubular motor includes a motor body 1, a reduction gear 2, a braking device 3, and an outer tube 4. The reduction gear 2 and braking device 3 are disposed inside the outer tube 4. The motor body 1 includes an output shaft 11 and a rotor 12. The output shaft 11 passes through the rotor 12 and is rotatable relative to it. Both axial ends of the output shaft 11 extend out of the outer tube 4. The rotor 12 and the reduction gear 2 are arranged adjacent to each other along the axial direction of the tubular motor. Other structures of the tubular motor, such as the control circuit board, can adopt the same structure as existing technologies.

[0040] The reduction gear 2 can be located near one end of the outer tube 4 and is positioned on one axial side of the rotor 12. The output shaft 11 of the motor body 1 passes through the rotor 12, with one end exiting from one end of the outer tube 4 and the other end passing through the reduction gear 2 and exiting from the outer tube 4. It can have at least two reduction stages. In this embodiment, the reduction gear 2 has three reduction stages, which are sequentially arranged from the direction closer to the rotor 12 to the direction farther away from the rotor 12 as the first reduction stage 21, the second reduction stage 22, and the third reduction stage 23. Each reduction stage can adopt a planetary gear set structure. The brake device 3 is located inside the reduction gear 2, such as between the first reduction stage 21 and the second reduction stage 22. Alternatively, the brake device 2 can also be located between other two adjacent reduction stages. Alternatively, the brake device 3 can also be located between the motor body 1 and the reduction gear 2, i.e., the rotor 12 and the reduction gear 2 are connected in a driving connection. Alternatively, the brake device 3 can also be located between the reduction gear 2 and the output shaft 11 (as the output end of the tubular motor), connecting the reduction gear 2 and the output shaft 11 in a driving connection.

[0041] The first-stage speed reducer 21 of the speed reducer 2 can be located on the side closest to the rotor 12 and is connected to the rotor 12 for transmission. The rotor 12 drives the input end of the first-stage speed reducer 21 to rotate. The output end of the last-stage speed reducer 2 (the third-stage speed reducer 23 in this embodiment) is connected to the output shaft 11, so that the last-stage speed reducer 2 can drive the output shaft 11 to rotate, thereby driving the external load connected to the output shaft 11.

[0042] The braking device 3 includes an input component 31, an output component 32, a coil spring 33, and a friction component 34. The input component 31 is connected to the output end of the first-stage reduction gear 21 of the reduction gear 2 to receive the torque output by the first-stage reduction gear 21. The output component 32 is connected to the input end of the second-stage reduction gear 22 of the reduction gear 2 to output torque to the second-stage reduction gear 22. When the braking device 3 is installed in other positions, the functions of the input component 31 and the output component 32 are similar.

[0043] The input component 31 includes a first disc-shaped body 311 and a first flange 312 formed on the first disc-shaped body 311. The output component 32 includes a second disc-shaped body 321 and a second flange 322 formed on the second disc-shaped body 321. The first disc-shaped body 311 is located near the second-stage reduction gear 22, and the second disc-shaped body 321 is located near the third-stage reduction gear 23. The first flange 312 extends toward the second disc-shaped body 321, and the second flange 322 extends toward the first disc-shaped body 311. The first flange 312 and the second flange 322 are staggered in the circumferential direction, and at least partially overlap along the axial direction of the tubular motor. The aforementioned helical spring 33 is sleeved on the outer periphery of the first flange 312 and the second flange 322, and the first disc-shaped body 311 and the second disc-shaped body 321 are located on opposite sides of the axial direction of the helical spring 33. The friction component 34 is located on the outer periphery of the helical spring 33 and abuts radially against the helical spring 33. The friction component 34 is directly or indirectly fixed to the outer tube 4. In this embodiment, the friction component 34 is fixed to the housing 24 of the deceleration device 2, and the housing 24 is fixed to the outer tube 4.

[0044] The two ends of the coil spring 33 form a first lug 331 and a second lug 332 extending radially inward into the coil spring 33. The first flange 312 of the input component 31 faces the coil spring 33, causing the coil spring 33 to tend to contract radially, thereby reducing the frictional force with the friction component 34, thus actuating it and allowing the input component 31 to transmit torque to the output component 32 for output. The first flange 312 of the input component 31 can abut against at least one lug of the coil spring 33. The second flange 322 of the output component 32 faces the coil spring 33, causing the coil spring 33 to tend to expand radially, thereby increasing the frictional force with the friction component 34, thus achieving braking. The first flange 312 of the input component 31 and the second flange 322 of the output component 32 abut against the opposite surfaces of one of the lugs.

[0045] The input component 31 further includes a first tube 313, and the output component 32 further includes a second tube 323. Both the first tube 313 and the second tube 323 are hollow and substantially cylindrical. The first tube 313 extends from inside the first disc 311 toward the output component 32, and the second tube 323 passes through the second disc 321. An annular groove 324 is formed on the outer peripheral wall of the end of the second tube 323 facing the input component 31. The braking device 3 also includes a retaining spring 35, which is at least partially engaged in the groove 324 and protrudes from the outer peripheral wall of the second tube 323. During installation, the second tube 323 passes through the first tube 313, with one end of the first tube 313 directly or indirectly abutting against the end face of the second disc 321 facing the input component 31 (direct abutting in this embodiment), and the other end of the first tube 313 abutting against the retaining spring 35. This achieves axial positioning of the input component 31, output component 32, and helical spring 33, ensuring that both the input component 31 and output component 32 can cooperate with the helical spring 33. Since the second tube 323 is a hollow tube, the output shaft 11 can pass through it, allowing relative rotation between the two. The first tube 313, the second tube 323, and the output shaft 11 are coaxially arranged.

[0046] Alternatively, the structures of the first tube 313 and the second tube 323 can be interchanged, i.e., the first tube 313 is inside and passes through the second tube 323, and the snap ring 35 is disposed on the first tube 313 to limit the axial position of the second tube 323, thereby limiting the axial relative position of the input component 31 and the output component 32.

[0047] When the tubular motor is energized, the rotor 12 of the motor body 1 rotates, driving the first-stage reduction gear 21 of the reduction gear 2. The first flange 312 of the input component 31 abuts against the edge of one of the second flanges 322 of the output component 32. The input component 31 and the output component 32 begin to rotate synchronously, and the first flange 312 abuts against one of the lugs of the coil spring 33, causing the coil spring 33 to contract radially, thereby actuating it. At this time, the braking device 3 does not have a braking effect, and the reduction gear 2 drives the output shaft 11 to output torque to the external load.

[0048] When the tubular motor is powered off, the external load causes the output component 32 to rotate a certain distance through the output shaft 11. At the same time, one of the second flanges 322 of the output component 32 abuts against one of the lugs of the coil spring 33, causing the coil spring 33 to tend to expand radially, thereby increasing the friction with the friction component 34 and thus braking. At this time, the braking device 3 performs the braking function.

[0049] Example 2

[0050] See Figure 7 and Figure 8 In this embodiment, the difference from the first embodiment is that the end of the second tube 323 facing the input component 31 has an annular protrusion 325, and the outer diameter of the protrusion 325 is larger than that of the second tube 323. During installation, the second tube 323 passes through the first tube 313, one end of the first tube 313 directly or indirectly abuts against the end face of the second disc 321 facing the input component 31, and the other end of the first tube 313 abuts against the protrusion 325.

[0051] This method in this embodiment eliminates the need for additional axial limiting components, reduces the number of parts, facilitates installation, and significantly lowers costs. To further facilitate the assembly of the input component 31 and the output component 32, a notch 326 can be provided on the second pipe 323. The notch 326 is formed by recessing from the end of the second pipe 323 toward the input component 31 in a direction away from the input component 31. This allows the second pipe 323 to deform sufficiently, so that the outer diameter can be reduced to a certain extent during installation, allowing the protrusion 325 to pass through the first pipe 313.

Claims

1. A tubular motor braking device, comprising: The input component (31) for receiving torque includes a first disc body (311) and a first flange (312) formed on the first disc body (311), the first flange (312) extending from the first disc body (311) toward a second disc body (321); The output component (32) for outputting torque includes a second disc (321) and a second flange (322) formed on the second disc (321), the second flange (322) extending from the second disc (321) toward the first disc (311); A helical spring (33), wherein a first flange (312) and a second flange (322) extend into the helical spring (33). When the first flange (312) engages with the helical spring (33), the helical spring (33) contracts radially inward; and when the second flange (322) engages with the helical spring (33), the helical spring (33) expands radially outward. A friction component (34), located on the outer periphery of the helical spring (33) and radially abutting against the helical spring (33), provides a braking frictional force to the helical spring (33); characterized in that: The input component (31) further includes a first tube (313), and the output component (32) further includes a second tube (323). Both the second tube (323) and the first tube (313) extend along the axial direction of the tubular motor. One of the first tube (313) and the second tube (323) passes through the other of the first tube (313) and the second tube (323). One end of the outer tube directly or indirectly abuts against the disc body corresponding to the inner tube, and the other end of the outer tube directly or indirectly abuts against the end of the inner tube.

2. The tubular motor braking device according to claim 1, characterized in that: The second pipe (323) passes through the first pipe (313), one end of the first pipe (313) directly or indirectly abuts against the second disc (321), and the other end of the first pipe (313) directly or indirectly abuts against the end of the second pipe (323) facing the first disc (311).

3. The tubular motor braking device according to claim 2, characterized in that: The second tube (323) has an annular groove (324) formed on the outer peripheral wall of the end facing the input component (31). The braking device also includes a retaining ring (35), which is at least partially inserted into the groove (324). The retaining ring (35) protrudes from the outer peripheral wall of the second tube (323). The first tube (313) abuts against the second tube (323) by abutting against the retaining ring (35).

4. The tubular motor braking device according to claim 2, characterized in that: The second pipe (323) has an annular protrusion (325) at the end facing the input component (31), the outer diameter of the protrusion (325) being larger than that of the second pipe (323), and the end of the first pipe (313) abutting against the protrusion (325).

5. The tubular motor braking device according to claim 4, characterized in that: The second pipe fitting (323) is provided with a notch (326), which is formed by the second pipe fitting (323) being recessed from the end of the second pipe fitting (323) toward the input component (31) in a direction away from the input component (31).

6. The tubular motor braking device according to claim 1, characterized in that: At least one end of the helical spring (33) forms a lug that extends radially into the interior of the helical spring (33), and the first flange (312) of the input component (31) and the second flange (322) of the output component (32) are located on opposite sides of the same lug and selectively abut against the lug.

7. A tubular motor, comprising a motor body (1) and a reduction gear (2), characterized in that: The braking device according to any one of claims 1 to 6 is disposed within the deceleration device (2), between the motor body (1) and the deceleration device (2), or between the deceleration device (2) and the output end of the tubular motor.

8. The tubular motor according to claim 7, characterized in that: The tubular motor also includes an outer tube (4), the speed reduction device (2), the braking device and the motor body (1) are disposed inside the outer tube (4), and the friction component (34) is fixed relative to the outer tube (4).

9. The tubular motor according to claim 7, characterized in that: The deceleration device (2) includes at least two deceleration stages, and the braking device (5) is disposed between two adjacent deceleration stages.

10. A tubular motor, comprising a motor body (1) and a reduction gear (2), characterized in that: According to any one of claims 2 to 5, the braking device is disposed inside the deceleration device (2), between the motor body (1) and the deceleration device (2), or between the deceleration device (2) and the output end of the tubular motor; The tubular motor also includes an outer tube (4), and the speed reduction device (2), braking device and motor body (1) are disposed inside the outer tube (4); The motor body (1) includes a rotor (12) and an output shaft (11) which is the output end of a tubular motor. The output shaft (11) passes through the rotor (12) and can rotate relative to the rotor (12). The rotor (12) is connected to the reduction gear (2) in a transmission. One axial end of the output shaft (11) passes through the outer tube (4), and the other axial end of the output shaft (11) passes through the reduction gear (2) and then passes through the outer tube (4). The output shaft (11) also passes through the second tube (323) and can rotate relative to the second tube (323).

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