Motor with braking function

Abstract

The utility model discloses a motor with a braking function, which comprises a motor main body, a driving shaft and a braking device, the braking device comprises a friction ring and an elastic ring, the friction ring is sleeved on the driving shaft and is provided with a plurality of arc-shaped friction plates attached to the surface of the driving shaft along the circumferential direction, and a gap is formed between every two adjacent arc-shaped friction plates; the elastic ring is sleeved on the peripheral wall of the arc-shaped friction plate and is used for enabling the arc-shaped friction plate to radially contract so as to press the driving shaft; and a limiting part is arranged on the friction ring, is in limiting fit with the motor main body and is used for limiting rotation of the friction ring. According to the motor with the braking function, the friction ring is not easy to wear, the service life is long, and the self-locking stability is good.

Description

Technical Field

[0001] This application relates to the field of drive motor technology, specifically to a motor with braking function. Background Technology

[0002] Current electric furniture, such as electric sofas, electric lifting platforms, and electric folding beds, are all equipped with linear drive devices. This linear drive device, also known as a linear actuator, is used to convert the kinetic energy of the rotational motion of the drive motor into linear power. Its structure includes a drive motor and a linear push rod that is connected to the drive motor for transmission.

[0003] To prevent electric furniture from passively descending under heavy external loads, or to ensure that electric furniture remains stably in a specific posture, the drive shaft of the linear drive motor is generally equipped with a braking device. This braking device is used to control the precision of the motor, or it can generate a self-locking force when the drive shaft of the motor passively rotates, thereby hindering or limiting the passive rotation of the drive shaft and ensuring the stability of the electric furniture. For example, Chinese patent application CN215861421U, entitled "Motor and Linear Actuator with Self-Locking Function," describes a friction ring mounted on the drive shaft of the motor. The friction ring has a notch and a limiting part. The end cover of the motor cooperates with the limiting part for limiting. Specifically, the end cover has a groove-shaped locking part, and the limiting part of the friction ring is circumferentially limited within the locking part, so that the friction ring grips the drive shaft when the drive shaft rotates in a first direction, thereby achieving self-locking or braking of the drive shaft.

[0004] The self-locking motors or motors mentioned above generally have the following defects in actual use: because the limiting part on the friction ring and the groove-shaped locking part on the end cover are rigidly abutting and limiting, the friction ring is easily worn and fails during the process of the friction ring clamping the drive shaft to provide rotational resistance to the drive shaft or to stop the drive shaft from rotating, resulting in a decrease in self-locking force and poor self-locking stability. Utility Model Content

[0005] The technical problem to be solved by this application is to overcome the defects of the above-mentioned related technologies and provide a motor with braking function that makes the friction ring less prone to wear, has a long service life, and has good self-locking stability.

[0006] The technical solution of this application is to provide a motor with braking function having the following structure: including...

[0007] Motor body and drive shaft

[0008] A braking device includes a friction ring and an elastic ring. The friction ring is sleeved on the drive shaft, and the friction ring has a plurality of arc-shaped friction plates along its circumference that fit against the surface of the drive shaft, with gaps formed between adjacent arc-shaped friction plates. The elastic ring is sleeved on the outer peripheral wall of the arc-shaped friction plates to cause the arc-shaped friction plates to radially contract and press against the drive shaft. The friction ring has a limiting part that cooperates with the motor body to limit the rotation of the friction ring.

[0009] In some embodiments, each of the arc-shaped friction plates has an arc-shaped groove on its outer peripheral wall along the circumferential direction, and the arc-shaped grooves on the plurality of arc-shaped friction plates surround to form an annular groove for the elastic ring to engage, wherein the inner diameter of the elastic ring is smaller than the inner diameter of the annular groove.

[0010] In some embodiments, the arcuate groove is disposed at the free end of the arcuate friction plate.

[0011] In some embodiments, the friction ring is interference-fitted with the drive shaft.

[0012] In some embodiments, the friction ring is provided with at least one radially outward protrusion, and the protrusion forms the limiting portion, and the motor body is provided with a snap-fit ​​groove that matches and engages with the protrusion.

[0013] In some embodiments, the bumps are multiple and distributed circumferentially along the friction ring.

[0014] In some embodiments, one end of the motor body is connected to an end cover through which the drive shaft passes, and the snap-fit ​​groove is provided on the end cover.

[0015] In some embodiments, the friction ring is provided with at least one limiting groove, and the limiting groove forms the limiting part, and the motor body is provided with a limiting block that matches and engages with the limiting groove.

[0016] In some embodiments, the elastic ring is a ring-shaped elastic ring made of rubber.

[0017] In summary, compared with related technologies, the motor with braking function proposed in this application has the following advantages: The motor with braking function has a friction ring fitted onto the drive shaft. This friction ring has multiple arc-shaped friction plates that conform to the surface of the drive shaft. Under the elastic force of the elastic ring, the arc-shaped friction plates radially contract to press against the drive shaft. The friction ring is restricted from circumferential rotation by the motor body. Therefore, when the drive shaft rotates, the arc-shaped friction plates always apply a pressing force to the drive shaft under the elastic force of the elastic ring. The friction between the arc-shaped friction plates and the drive shaft provides braking force to restrict the rotation of the drive shaft. When the motor brakes and stops, the drive shaft can stop quickly, improving the control accuracy of the motor. Moreover, in the motor-stopped state, the friction between the arc-shaped friction plates and the drive shaft gives the drive shaft a self-locking capability, preventing it from easily rotating under external force. Furthermore, the arc-shaped friction plates have a certain elastic range of motion in the radial direction, which can automatically adjust or balance the clamping or pressing force of the friction ring on the drive shaft to prevent or delay wear and failure of the friction ring, resulting in a long service life and good self-locking stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a motor with braking function according to this application.

[0019] Figure 2 This is a schematic diagram of the installation structure of a braking device for a motor with braking function according to this application.

[0020] Figure 3 This is a cross-sectional structural schematic diagram of an electric motor with braking function according to this application.

[0021] Figure 4 This is a schematic diagram of the assembly structure of a motor with braking function according to this application.

[0022] Figure 5 This is a schematic diagram of the assembly structure of a motor with braking function from another angle according to this application.

[0023] Figure 6 This is a schematic diagram of the structure of a braking device for an electric motor with braking function according to this application.

[0024] Figure 7 This is a schematic diagram of the assembly structure of a braking device for an electric motor with braking function according to this application.

[0025] Figure 8 This is a cross-sectional structural schematic diagram of a braking device for an electric motor with braking function according to this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Motor body; 100. End cover; 101. Snap-fit ​​groove; 2. Drive shaft; 3. Friction ring; 300. Arc-shaped friction plate; 301. Gap; 302. Arc-shaped groove; 303. Elastic ring; 304. Protrusion. Detailed Implementation

[0028] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0029] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0030] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] See Figures 1-5 As shown in the figure, this application discloses a motor with braking function, also known as a self-locking motor, which is used as a power source in the linear drive device of electric furniture. In this embodiment, the motor includes a motor body 1 and a drive shaft 2 connected to the center of the motor body 1. The motor body 1 drives the drive shaft 2 to rotate to output power.

[0033] Further in this embodiment, see Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a braking device is installed on the drive shaft 2 of the motor with braking function. The braking device is used to provide braking force to the drive shaft 2 to limit the rotation of the drive shaft 2, so that the drive shaft 2 can stop quickly when the motor stops, and when the drive shaft 2 is stationary, it can have a self-locking function to keep it stationary, so that the electric furniture can be kept in a specific posture. Specifically, in this embodiment, the braking device is also called a self-locking device. Its structure includes a friction ring 3 and an elastic ring 303. The friction ring 3 is sleeved on the drive shaft 2, and the friction ring 3 is provided with a plurality of arc-shaped friction plates 300 spaced apart along the circumference and in contact with the surface of the drive shaft 2. A gap 301 is formed between adjacent arc-shaped friction plates 300. The gap 301 extends along the axial direction of the friction ring 3 and penetrates the free end face of the arc-shaped friction plate 300, so that the arc-shaped friction plate 300 can undergo elastic deformation in the radial direction or has a tendency to move with elastic deformation. The elastic ring 303 is sleeved on the outer peripheral wall of the arc-shaped friction plate 300 and is used to make the arc-shaped friction plate 300 radially contract to press the drive shaft 2. The friction ring 3 is circumferentially limited in the motor body 1 so that the friction ring 3 does not rotate with the rotation of the drive shaft 2. When the drive shaft 2 rotates, the friction ring 3 provides a braking force to restrict the rotation of the drive shaft 2.

[0034] Furthermore, in this embodiment, in order to increase the contact area between the arc-shaped friction plate 300 and the drive shaft 2, the curvature of the inner peripheral wall of the arc-shaped friction plate 300 is adapted to the surface curvature of the drive shaft 2. Under the elastic force of the elastic ring 303, the inner peripheral wall of the arc-shaped friction plate 300 is pressed tightly against the outer peripheral wall of the drive shaft 2.

[0035] In the aforementioned embodiment, the arc-shaped friction plate 300, under the elastic force of the elastic ring 303, grips the drive shaft 2 and applies a clamping force to the drive shaft 2. When the drive shaft 2 rotates, the friction between the arc-shaped friction plate 300 and the drive shaft 2 provides resistance or braking force to restrict the rotation of the drive shaft 2. When the motor brakes and stops, the resistance of the arc-shaped friction plate 300 on the drive shaft 2 can make the drive shaft 2 stop quickly, thereby improving the control accuracy of the motor. Moreover, in the motor-stopped state, the friction between the arc-shaped friction plate 300 and the drive shaft 2 can give the drive shaft 2 a self-locking capability, so that the drive shaft 2 will not easily rotate under the action of external force. In addition, under the elastic force of the elastic ring 303, the arc-shaped friction plate 300 has a certain elastic movement space in the radial direction, thereby automatically adjusting or balancing the gripping force or clamping force of the friction ring 3 on the drive shaft 2, so as to prevent or delay the wear and failure of the friction ring 3, so that the service life of the friction ring 3 is long and the self-locking stability is good.

[0036] In this embodiment, the friction ring 3 can be a metal part or a plastic part, which has good wear resistance and elastic deformation capability.

[0037] Furthermore, in this embodiment, the elastic ring 303 is an annular elastic ring 303 made of rubber, which has a simple structure and is easy to install. Of course, the user can replace the elastic ring 303 with one of different elastic force according to the required clamping force between the arc-shaped friction plate 300 and the drive shaft 2.

[0038] It is understandable that, in actual use, to reduce wear on the arc-shaped friction plate 300 and extend the service life of the friction ring 3, lubricating grease is usually filled or coated between the friction ring 3 and the drive shaft 2. When the motor is working, the drive shaft 2 rotates at a high speed, and the lubricating grease is driven and forms a lubricating oil film between the friction ring 3 and the drive shaft 2 under the action of centrifugal force. At this time, the resistance of the arc-shaped friction plate 300 of the friction ring 3 to the motor drive shaft 2 is relatively small, avoiding power loss of the motor and making the friction ring 3 less prone to wear. During the braking process or when the drive shaft 2 of the motor is stationary, the lubricating grease on the surface of the drive shaft 2 is pressed into the gap 301 between adjacent arc-shaped friction plates 300 under the pressure of the arc-shaped friction plate 300. At this time, the resistance of the friction ring 3 to the drive shaft 2 increases to achieve braking or self-locking. In this embodiment, the gap 301 between adjacent arc-shaped friction plates 300 not only improves the elastic deformation capability of the arc-shaped friction plate 300, but also serves as an oil storage function.

[0039] In this embodiment, see Figure 6 , Figure 7 and Figure 8 As shown, each arc-shaped friction plate 300 has an arc-shaped groove 302 on its outer peripheral wall along the circumferential direction. The arc-shaped grooves 302 on multiple arc-shaped friction plates 300 together form an annular groove for the elastic ring 303 to engage. The inner diameter of the elastic ring 303 is smaller than the inner diameter of the annular groove, and the elastic ring 303 is tightly fitted within the annular groove. The arc-shaped grooves 302 on the arc-shaped friction plate 300 axially limit the elastic ring 303 on the friction ring 3, preventing axial movement of the elastic ring 303 on the friction ring 3 and maintaining a stable pressing force of the arc-shaped friction plate 300 on the drive shaft 2.

[0040] When assembling the braking device, see Figure 6 and Figure 7 As shown, the friction ring 3 is fitted onto the drive shaft 2, and then an elastic ring 303 is fitted onto the friction ring 3, with the elastic ring 303 accommodated or engaged within the arc-shaped groove 302 of the arc-shaped friction plate 300. To facilitate the assembly of the elastic ring 303 and to make the arc-shaped friction plate 300 more easily press against the drive shaft 2 under the elastic force of the elastic ring 303, the arc-shaped groove 302 on the arc-shaped friction plate 300 is set at the free end of the arc-shaped friction plate 300. This not only facilitates the installation of the elastic ring 303, but also allows the deformation of the arc-shaped friction plate 300 to reach its maximum under the elastic force of the elastic ring 303, thereby causing the arc-shaped friction plate 300 to contract radially to grip the drive shaft 2.

[0041] Furthermore, in this embodiment, the friction ring 3 is interference-fitted with the drive shaft 2, which gives the friction ring 3 itself a certain clamping force on the surface of the drive shaft 2. Therefore, when the drive shaft 2 rotates, in addition to the elastic force applied by the elastic ring 303 to the arc-shaped friction plate 300, which causes friction between the arc-shaped friction plate 300 and the drive shaft 2, there is also a certain friction between the friction ring 3 itself and the drive shaft 2. Therefore, the braking device of the motor can provide a large braking force to the drive shaft 2, so that the drive shaft 2 can stop rotating quickly. Moreover, when the drive shaft 2 is stationary, the self-locking capability of the drive shaft 2 is stronger.

[0042] In the above embodiment, the friction ring 3 is circumferentially limited within the motor body 1, meaning that the friction ring 3 has a limiting part that cooperates with the motor body 1 to limit the rotation of the friction ring 3. This circumferential limiting of the friction ring 3 and the motor body 1 can be implemented in various ways; in this embodiment, see... Figure 4 and Figure 5 As shown, the friction ring 3 has at least one radially outward protrusion 304, and the protrusion 304 forms a limiting part. The motor body 1 has a locking groove 101 that matches and engages with the protrusion 304. The protrusion 304 on the friction ring 3 engages in the locking groove 101 on the motor body 1, thereby restricting the circumferential rotation of the friction ring 3.

[0043] It is understood that the limiting part is provided on the friction ring 3, which cooperates with the motor body 1 to limit the circumferential rotation of the friction ring 3. Therefore, the number of the limiting part can be one, two, or three, etc., and the setting position of the limiting part on the friction ring 3 is not specifically limited, as long as it is connected to the outer circumference of the friction ring 3. Furthermore, in this embodiment, multiple protrusions 304 are provided and distributed along the circumference of the friction ring 3, and multiple corresponding snap-fit ​​grooves 101 are also provided, each corresponding to a protrusion 304. This arrangement makes the friction ring 3 more stably circumferentially limited within the motor body 1.

[0044] In other embodiments, at least one limiting groove may be provided on the friction ring 3, and the limiting groove forms a limiting part of the friction ring 3. The motor body 1 is provided with a limiting block that matches and engages with the limiting groove. The limiting groove on the friction ring 3 matches and engages with the limiting block on the motor body 1, so that the friction ring 3 is circumferentially limited on the motor body 1.

[0045] In this embodiment, an end cover 100 for the drive shaft 2 to pass through is connected to one end of the motor body 1 near the power output end of the drive shaft 2. A snap-fit ​​groove 101 is provided on the end cover 100, that is, the friction ring 3 of the braking device is provided on the side of the drive shaft 2 near its power output end; in other embodiments, the friction ring 3 of the braking device can also be provided at the tail end or middle of the drive shaft 2, etc.

[0046] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0047] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A motor with braking function, characterized in that: include Motor body and drive shaft A braking device includes a friction ring and an elastic ring. The friction ring is sleeved on the drive shaft, and the friction ring has a plurality of arc-shaped friction plates along its circumference that fit against the surface of the drive shaft, with gaps formed between adjacent arc-shaped friction plates. The elastic ring is sleeved on the outer peripheral wall of the arc-shaped friction plates to cause the arc-shaped friction plates to radially contract and press against the drive shaft. The friction ring has a limiting part that cooperates with the motor body to limit the rotation of the friction ring.

2. The motor with braking function according to claim 1, characterized in that: Each of the arc-shaped friction plates has an arc-shaped groove on its outer peripheral wall along the circumferential direction, and the arc-shaped grooves on the multiple arc-shaped friction plates surround each other to form an annular groove for the elastic ring to engage. The inner diameter of the elastic ring is smaller than the inner diameter of the annular groove.

3. The motor with braking function according to claim 2, characterized in that: The arc-shaped groove is located at the free end of the arc-shaped friction plate.

4. The motor with braking function according to claim 1, characterized in that: The friction ring is interference-fitted with the drive shaft.

5. The motor with braking function according to claim 1, characterized in that: The friction ring is provided with at least one radially outward protrusion, and the protrusion forms the limiting part. The motor body is provided with a snap-fit ​​groove that matches and engages with the protrusion.

6. The motor with braking function according to claim 5, characterized in that: The bumps are multiple and distributed circumferentially along the friction ring.

7. The motor with braking function according to claim 5, characterized in that: One end of the motor body is connected to an end cover through which the drive shaft passes, and the snap-fit ​​groove is provided on the end cover.

8. The motor with braking function according to claim 1, characterized in that: The friction ring is provided with at least one limiting groove, and the limiting groove forms the limiting part. The motor body is provided with a limiting block that matches and engages with the limiting groove.

9. The motor with braking function according to claim 1, characterized in that: The elastic ring is a ring-shaped elastic ring made of rubber.

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