Circuit breaker driving mechanism and circuit breaker

Abstract

The utility model belongs to the field of electrical equipment, and particularly relates to a circuit breaker driving mechanism which is configured to be installed in a circuit breaker, the circuit breaker driving mechanism comprises a servo motor and a cam assembly, the cam assembly comprises a cam, a driven piece and a guiding piece, the servo motor can drive the cam to rotate, and the driven piece can drive the cam to rotate. And the driven part is configured to be driven by the cam and move horizontally under the limitation of the guide part, and the movement of the driven part drives a moving contact of the circuit breaker to move, so that the moving contact is in contact with or separated from a static contact of the circuit breaker. According to the circuit breaker driving mechanism provided by the utility model, the moving contact of the circuit breaker is enabled to move accurately and stably, the phenomena of closing bounce, opening overshoot, bounce and the like are basically eliminated, and the service life of the circuit breaker is prolonged. A corresponding circuit breaker may have fewer drive chain components. The utility model also relates to a circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electrical equipment, specifically relates to a circuit breaker drive mechanism and a circuit breaker. BACKGROUND

[0002] Circuit breakers, such as medium voltage circuit breakers, are widely used in the electrical field. In traditional medium voltage circuit breakers, the transmission chain is relatively complex, and there are problems such as closing bounce, opening rebound and large overshoot in the closing and opening process of the circuit breaker, which reduces the working life of each component in the transmission chain. Generally speaking, a damping mechanism such as oil buffer is used in traditional medium voltage circuit breakers to mitigate the problems of rebound and overshoot.

[0003] However, in the case of using a damping mechanism, the rebound and overshoot phenomenon still exists obviously. As a result, the service life of the bellows in the arc-extinguishing chamber of the circuit breaker is also adversely affected. In addition, the damping mechanism currently applied to the circuit breaker is greatly affected by temperature. For example, when the temperature is low, the damping mechanism hinders the rapid closing of the circuit breaker.

[0004] Therefore, it is desirable to have a solution that at least partially solves the above problems. SUMMARY

[0005] To solve the above problems, according to the first aspect of the utility model, a circuit breaker drive mechanism is provided, which is configured to be installed in a circuit breaker, characterized in that the circuit breaker drive mechanism comprises a servo motor and a cam assembly, the cam assembly comprises a cam, a driven part and a guide, wherein the servo motor can drive the cam to rotate, the driven part is configured to be driven by the cam and to move translationally under the restriction of the guide, and the movement of the driven part drives the movement of the movable contact of the circuit breaker to make the movable contact contact or separate from the stationary contact of the circuit breaker.

[0006] In the circuit breaker drive mechanism according to the first aspect of the utility model, the servo motor outputs smooth and high-precision drive to the cam, the cam drives the driven part to move translationally, and the driven part in turn drives the movement of the movable contact. As a result, the movement of the movable contact of the corresponding circuit breaker is accurate and smooth, basically eliminating phenomena such as closing bounce, opening overshoot and rebound, thereby greatly reducing the oscillation impact on the bellows in the arc-extinguishing chamber and the wear of each component in the transmission chain, and increasing the service life of the circuit breaker. Further, the speed of closing and opening of the circuit breaker can be adjusted by adjusting the pulse current of the servo motor, without adjusting the structure and interaction of each component in the transmission chain, so the adjustment is convenient and fast.

[0007] In addition, the circuit breaker provided with the circuit breaker drive mechanism according to the first aspect of the utility model has less transmission chain components. In particular, the damping mechanism can be removed from the transmission chain, and the opening and closing of the circuit breaker is basically not affected by temperature.

[0008] The circuit breaker drive mechanism according to the utility model can have one or more of the following features, alone or in combination.

[0009] According to one embodiment, preferably, the cam is configured to be driven to rotate in only a single direction. In the circuit breaker drive mechanism according to this embodiment, since the cam is driven to rotate in only a single direction, the servo motor can be configured to drive the cam only through unidirectional rotation, and the cam drives the follower to translate between its two limit positions only through unidirectional rotation. In this way, the components from the servo motor to the cam are prevented from generating reverse movements during the opening and closing of the circuit breaker, respectively, and the impact generated between the reverse movements is avoided accordingly. Therefore, the entire circuit breaker drive mechanism operates more smoothly, and the wear of the corresponding components is further reduced.

[0010] According to one embodiment, preferably, the cam is a disc cam, and the follower comprises a follower body, an inner portion of the follower body being provided with a hole, wherein an outer edge of the cam is configured to continuously contact at least a portion of an inner wall of the hole.

[0011] According to one embodiment, preferably, the cam is an eccentric disc cam having a circular cross section, and the inner wall of the hole has a first inner wall section and a second inner wall section opposite to each other in the moving direction of the follower, wherein the first inner wall section and the second inner wall section are parallel to each other and both orthogonal to the moving direction of the follower, and the distance between the first inner wall section and the second inner wall section is equal to the diameter of the cross section of the cam.

[0012] According to one embodiment, preferably, the inner wall of the hole has a whole track shape.

[0013] According to one embodiment, preferably, the follower body forms a closed frame shape around the hole.

[0014] According to one embodiment, preferably, the guide comprises a first guide rod and a second guide rod, the first guide rod and the second guide rod are elongated along the moving direction of the follower and are respectively arranged on two sides of the follower body, the follower comprises one or more guide portions on the two sides of the follower body respectively, each guide portion is sleeved on a corresponding one of the first guide rod and the second guide rod, so that the follower can move along the first guide rod and the second guide rod.

[0015] According to one embodiment, preferably, the circuit breaker drive mechanism further comprises a gear assembly arranged between the servo motor and the cam.

[0016] According to one embodiment, preferably, the circuit breaker drive mechanism does not comprise a damping mechanism in the transmission chain from the output shaft of the servo motor to the follower of the cam assembly.

[0017] According to a second aspect of the application, a circuit breaker is presented, the circuit breaker comprising any of the circuit breaker drive mechanisms described above, the circuit breaker being a medium voltage circuit breaker.

[0018] The circuit breaker according to the second aspect of the application has the respective advantages of the circuit breaker drive mechanisms described above. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments of the application will be briefly introduced below. The drawings are merely used to show some embodiments of the application, and the application is not limited to the drawings.

[0020] Figure 1 is a perspective view of a circuit breaker drive mechanism according to the application.

[0021] Figure 2 is a cross-sectional view of a circuit breaker drive mechanism according to the application.

[0022] Figure 3A and Figure 3B are perspective views of partial components of a circuit breaker drive mechanism according to the application, respectively.

[0023] Figure 4A , Figure 4B and Figure 4C are cross-sectional views of partial components of a circuit breaker drive mechanism according to the application from another perspective, showing different rotational positions of the cam.

[0024] LIST OF REFERENCE NUMBERS

[0025] 10 circuit breaker drive mechanism

[0026] 100 servo motor

[0027] 110 output shaft

[0028] 200 cam assembly

[0029] 300 cam

[0030] 310 outer edge of the cam

[0031] 400 follower

[0032] 410 follower body

[0033] 420 hole

[0034] 421 inner wall

[0035] 4211 first inner wall section

[0036] 4212 second inner wall section

[0037] 451 first guide portion

[0038] 452 second guide portion

[0039] 453 third guide portion

[0040] 454 fourth guide portion

[0041] 460 driver connection portion

[0042] 500 guide

[0043] 510 first guide rod

[0044] 520 second guide rod

[0045] 600 bracket

[0046] 610 base

[0047] 620 first main shaft support portion

[0048] 621 first fixing portion

[0049] 622 second fixing portion

[0050] 623 third fixing portion

[0051] 624 fourth fixing portion

[0052] 630 second main shaft support portion

[0053] 710 gear assembly

[0054] 711 drive gear

[0055] 712 driven gear

[0056] 720 main shaft

[0057] 721 pin

[0058] 731 first bearing

[0059] 732 second bearing

[0060] 740 movable contact driver DETAILED DESCRIPTION

[0061] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model embodiments will be described clearly and completely in the following with reference to the drawings of the utility model specific embodiments. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0062] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings understood by those skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model patent application description and claims do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not necessarily represent a quantity limit. "Include" or "contain" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0063] The utility model will be described in detail below by describing example embodiments.

[0064] Figure 1 A perspective view of a circuit breaker drive mechanism 10 according to the utility model is shown, Figure 2 A cross-sectional view of a circuit breaker drive mechanism 10 according to the utility model is shown. The circuit breaker drive mechanism 10 comprises a servo motor 100, Figure 2 An output shaft 110 of the servo motor 100 is shown. The circuit breaker drive mechanism 10 further comprises a cam assembly 200, which comprises a cam 300, a follower 400 and a guide 500 (see also Figure 3A And Figure 3B ). In addition, the circuit breaker drive mechanism 10 further comprises a bracket 600, which holds some components of the servo motor 100 and the cam assembly 200, as will be described in detail later.

[0065] Figure 1 And Figure 2The movable contact driving member 740 is also shown. In the circuit breaker in which the circuit breaker driving mechanism 10 according to the present application is installed, one end of the movable contact driving member 740 is fixedly connected to the movable contact of the circuit breaker, and the other end is fixedly connected to the follower 400 of the cam assembly 200, for example, to the protrusion of the follower body 410 of the follower 400 (see also Figure 3A and Figure 3B ). Thereby, the servo motor 100 can drive the cam 300 to rotate via the output shaft 110, and the follower 400 is driven by the cam 300 to move translationally under the restriction of the guide 500, for example, to move upward or downward in the perspective of Figure 1 and Figure 2 . The movement of the follower 400 drives the movable contact driving member 740 to move, for example, to move translationally, and the movable contact driving member 740 in turn drives the movable contact of the circuit breaker to move to make the movable contact contact or separate from the stationary contact of the circuit breaker. Specifically, for example, in a medium-voltage circuit breaker, both the movable contact and the stationary contact are arranged in an arc chamber, and the movable contact driving member 740 is fixedly connected to the movable contact directly or indirectly. In addition, in the medium-voltage circuit breaker, a bellows can be arranged inside the arc chamber, one end of the bellows is attached to a conductive rod fixedly connected to the movable contact (the conductive rod is fixedly connected to the movable contact driving member 740 or is a part of the movable contact driving member 740), and the other end of the bellows is attached to the inner wall of the arc chamber to ensure the vacuum degree.

[0066] As shown in Figure 1 and Figure 2 and other drawings, a three-dimensional coordinate system is defined for the convenience of description. The X-axis of the coordinate system corresponds to the rotation axis of the output shaft 110 of the servo motor 100, the Z-axis of the coordinate system corresponds to the direction along which the follower 400 moves translationally, and the Y-axis of the coordinate system is perpendicular to the X-axis and the Z-axis.

[0067] Figure 3A and Figure 3B shows a perspective view of part of the components of the circuit breaker driving mechanism 10 according to the present application. Specifically, for the sake of display clarity, Figure 3A the bracket 600 is not shown, Figure 3B the bracket 600 and the first bearing 731 are not shown. Next, the cam assembly 200 is mainly described with reference to Figure 3B .

[0068] As shown in Figure 3BAs shown, the cam assembly 200 includes a cam 300, a follower 400, and a guide 500. The cam 300 is a disc-shaped cam. The follower 400 includes a follower body 410, and the follower body 410 is internally provided with a hole 420. The cam 300 is located within the hole 420, and the outer edge 310 of the cam 300 is configured to continuously contact at least a portion of the inner wall 421 of the hole 420. Thus, when the cam 300 rotates, the follower 400 can be continuously driven by the cam 300, thereby driving the movement of the movable contact of the circuit breaker. The guide 500 includes a first guide rod 510 and a second guide rod 520. The first guide rod 510 and the second guide rod 520 are fixedly arranged relative to the bracket 600, for example, the first guide rod 510 and the second guide rod 520 are held by the bracket 600. Specifically, the first guide rod 510 and the second guide rod 520 are elongated along the movement direction of the follower 400, and for example, have a straight shape, in other words, both guide rods are arranged along the Z-axis.

[0069] As shown in Figure 3B , the first guide rod 510 and the second guide rod 520 are also respectively arranged on both sides of the follower body 410, for example, are respectively arranged on both sides of the follower body 410 along the Y-axis direction. In addition, the follower 400 includes one or more guide portions on both sides of the follower body 410, respectively. Specifically, in Figure 3B , the first guide portion 451 and the second guide portion 452 are protruding portions protruding from one side of the follower body 410 in a direction away from the follower body 410, and each of the first guide portion 451 and the second guide portion 452 is provided with a through hole to be sleeved on the first guide rod 510. The third guide portion 453 and the fourth guide portion 454 are protruding portions protruding from the side of the follower body 410 opposite to the side where the first guide portion 451 and the second guide portion 452 are located, away from the follower body 410, and each of the third guide portion 453 and the fourth guide portion 454 is provided with a through hole to be sleeved on the second guide rod 520. The first guide portion 451, the second guide portion 452, the third guide portion 453, and the fourth guide portion 454 are fixed relative to the follower body 410, for example, are integrally formed with the follower body 410. Thus, the follower 400 is configured to move along the first guide rod 510 and the second guide rod 520 under the restriction of the first guide rod 510 and the second guide rod 520.

[0070] Next, the transmission relationship between the servo motor 100 and the cam assembly 200 in the embodiment according to the present application is described with reference to Figure 2 and Figure 3A , Figure 3B .

[0071] As shown in Figure 2As shown, a gear assembly 710 is provided between the servo motor 100 and the cam 300. Specifically, the gear assembly 710 may include a drive gear 711 disposed on the output shaft 110 of the servo motor 100 and a driven gear 712 meshing with the drive gear 711. The driven gear 712 is disposed on a main shaft 720 fixedly connected to the cam 300 (for example, the driven gear 712 and the main shaft 720 are rotated via a pin 721). For example, the main shaft 720 may also be formed as an integral part with the cam 300 to further ensure their synchronous rotation. Thus, the servo motor 100 can drive the cam 300 to rotate.

[0072] like Figure 2 Further shown, the bracket 600 may include a base 610, a first spindle support 620, and a second spindle support 630. The first spindle support 620 rotatably holds one end of the spindle 720 via a first bearing 731. The second spindle support 630 rotatably holds the other end of the spindle 720 via a second bearing 732, and can also be fixed to the body of the servo motor 100. Furthermore, the second spindle support 630 can also rotatably support the output shaft 110 of the servo motor 100 via another bearing. The base 610 fixes the first spindle support 620 and the second spindle support 630 together. For example, the base 610, the first spindle support 620, and the second spindle support 630 can be formed as a single component. Furthermore, the first guide rod 510 and the second guide rod 520 of the cam assembly 200 can be held by the first spindle support 620, for example by one or more fixing parts fixedly connected to the first spindle support 620, as detailed below.

[0073] Figures 4A to 4C Cross-sectional views of some components of the circuit breaker drive mechanism 10 according to the present invention are shown from another perspective, these cross-sectional views generally along... Figure 2 The middle AA line is cut off, mainly to show Figure 2 The structure of the components on the left side (including the cam assembly 200).

[0074] like Figures 4A to 4CAs shown, according to the embodiment of the present application, the cam 300 is an eccentric disc cam having a circular cross section, and the inner wall 421 of the hole 420 has an elongated shape in the Y-axis direction. Specifically, the inner wall 421 has a first inner wall section 4211 and a second inner wall section 4212 opposite to each other in the moving direction of the follower 400 (positive and negative Z-axis directions in the drawing), and the first inner wall section 4211 and the second inner wall section 4212 are parallel to each other and both orthogonal to the moving direction of the follower 400. In addition, the distance between the first inner wall section 4211 and the second inner wall section 4212 is equal to the diameter of the cross section of the cam 300. Meanwhile, the overall size of the inner wall 421 in the Y-axis direction is configured to allow the cam 300 to rotate a certain angle along its rotation axis, for example, 180 degrees, and for example, 360 degrees, and the outer edge 310 of the cam 300 continuously contacts at least a portion of the inner wall 421 of the hole 420.

[0075] By configuring the cam 300 and the follower 400 such that the outer edge 310 of the cam 300 continuously contacts at least a portion of the inner wall 421 of the hole 420, the extent of the bounce and the over-throw and the rebound of the relay when closing and opening can be reduced from the structural aspect. On the one hand, the cam 300 with the rotation speed controlled more accurately by the servo motor 100 can continuously drive the follower 400 to move. Further, in the case where the distance between the first inner wall section 4211 and the second inner wall section 4212 is equal to the diameter of the cross section of the cam 300, the tendency of the bounce, the over-throw and the rebound of the movable contact is inhibited by the space between the cam 300 and both the first inner wall section 4211 and the second inner wall section 4212.

[0076] Figures 4A to 4C The specifically shown inner wall 421 has a whole shape of a racetrack. In other words, one end of the first inner wall section 4211 and one end of the second inner wall section 4212 of the inner wall 421 are connected by an arc-shaped (for example, semicircular) inner wall section, the other end of the first inner wall section 4211 and the other end of the second inner wall section 4212 are connected by another arc-shaped (for example, semicircular) inner wall section, and the two arc-shaped inner wall sections form a recess, so that the inner wall sections collectively form a racetrack shape. In this way, a relatively smooth inner wall 421 of the hole 420 can be formed, so that the structure of the follower 400 is not easy to be damaged. In addition, as shown, the follower body 410 forms a closed frame shape around the hole 420. In this way, the follower 400 is made of less material, and the structure is not easy to be damaged. Figures 4A to 4C

[0077] Figures 4A to 4C Views of the cam 300 rotating to different rotation positions in the circuit breaker drive mechanism 10 according to the embodiment of the present application are shown respectively. In the views, the cam 300 is shown in different rotation positions, and the follower 400 is shown in different positions corresponding to the rotation positions of the cam 300. Figure 4A ​In this circuit breaker, the center of cam 300 is located below the rotation axis of cam 300, and the follower 400 is in a slightly lower position, so that in the corresponding circuit breaker, the moving contact and the stationary contact are separated from each other, and the distance between the moving contact and the stationary contact is at its maximum value. Figure 4B In this circuit breaker, the center of cam 300 is at the same horizontal level as the axis of rotation of cam 300, and the follower 400 is in the middle position. In the corresponding circuit breaker, the moving contact and the stationary contact are still separated from each other, but the distance between the moving contact and the stationary contact is relative to... Figure 4A Reduce. In Figure 4C In this circuit breaker, the center of cam 300 is located above the rotation axis of cam 300, and the follower 400 is in a slightly upward position, so that in the corresponding circuit breaker, the moving contact moves to contact the stationary contact. In other words, Figure 4A and Figure 4C The two extreme positions of the follower 400 are shown respectively. Figure 4A In the middle, the driven member 400 is located at the highest point. Figure 4C In the middle, the follower 400 is located at the lowest point.

[0078] Therefore, for example, the circuit breaker drive mechanism 10 can be configured to drive the cam 300 from the servo motor 100. Figure 4A rotation position, via Figure 4B Rotation position rotated to Figure 4C The servo motor 100 rotates to change the circuit breaker from an open state (contacts separated) to a closed state (contacts in contact). Because the servo motor 100 outputs a smooth and high-precision drive to the cam 300, and the cam assembly 200 transmits this smooth and high-precision drive, the moving contact can move precisely and smoothly throughout the closing process. According to an embodiment of this invention, the displacement speed of the moving contact relative to time can be set by specifically varying the rotational speed output by the servo motor 100 relative to time. For example, the displacement speed of the moving contact can be set lower near the beginning and end of its stroke to suppress tendencies such as bouncing, overshoot, and rebound, or even completely eliminate these phenomena.

[0079] Furthermore, according to an embodiment of the present invention, the cam 300 can be configured to be driven to rotate only in a single direction. This configuration can be implemented, for example, by setting the servo motor 100 to output rotation only in a single rotational direction. Accordingly, the cam 300 and the follower 400 are configured such that the cam 300 can rotate more than 360 degrees in a single direction within the hole 420 of the follower 400, so that the cam 300 can drive the follower 400 to move between its two extreme positions without rotating in the opposite direction. Thus, the intermediate transmission component (e.g., gear assembly 710) between the servo motor 100 and the cam 300 also only needs to rotate in a single direction, avoiding component vibration and wear caused by switching rotational directions between the components from the servo motor 100 to the follower 400 of the cam assembly 200. Therefore, the circuit breaker drive mechanism 10 allows the corresponding circuit breaker to complete the switching between the closed and open states at a faster speed. For example, compared to existing circuit breakers, the circuit breaker using the circuit breaker drive mechanism 10 according to this embodiment can significantly reduce the time required for the reclosing process, while also significantly reducing wear on various components.

[0080] Accordingly, in the circuit breaker drive mechanism 10 according to the embodiment of the present invention, the transmission chain from the output shaft 110 of the servo motor 10 to the follower 400 of the cam assembly 200 may not include a damping structure, while still being able to perform fast closing and opening, and the circuit breaker has a long service life.

[0081] In addition, such as Figures 4A to 4C As shown, the first guide rod 510 and the second guide rod 520 can be fixed by one or more fixing parts. For example, the first fixing part 621 and the second fixing part 622 are provided on the first guide rod 510 and located at both ends of the stroke of the first guide part 451 and the second guide part 452 of the follower 400. The position of the first fixing part 621 is spaced apart from the extreme position of the first guide part 451, and the position of the second fixing part 622 is spaced apart from the extreme position of the second guide part 452, so as to avoid hindering the movement of the follower 400. The third fixing part 623 and the fourth fixing part 624 are provided on the second guide rod 520 and located at both ends of the stroke of the third guide part 453 and the fourth guide part 454 of the follower 400. The position of the third fixing part 623 is spaced apart from the extreme position of the third guide part 453, and the position of the fourth fixing part 624 is spaced apart from the extreme position of the fourth guide part 454, so as to avoid hindering the movement of the follower 400.

[0082] In addition, refer to Figure 1 The first fixing part 621, the second fixing part 622, the third fixing part 623 and the fourth fixing part 624 can be fixedly connected to the first spindle support part 620 of the bracket 600, for example, formed integrally with the first spindle support part 620 of the bracket 600.

[0083] The exemplary embodiments of the circuit breaker driving mechanism and the circuit breaker according to the present application are described in detail above with reference to preferred embodiments, however, it is understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments, and various technical features and structures according to the present application can be combined without departing from the concept of the present application, and without exceeding the protection scope of the present application.

Claims

1. A circuit breaker drive mechanism, configured to be installed in a circuit breaker, characterized in that, The circuit breaker drive mechanism (10) includes a servo motor (100) and a cam assembly (200). The cam assembly (200) includes a cam (300), a follower (400), and a guide (500). The servo motor (100) is capable of driving the cam (300) to rotate. The follower (400) is configured to be driven by the cam (300) and to translate under the constraint of the guide (500). The movement of the follower (400) drives the moving contact of the circuit breaker to move so that the moving contact contacts or separates from the stationary contact of the circuit breaker.

2. The circuit breaker drive mechanism according to claim 1, characterized in that, The cam (300) is configured to be driven to rotate in only a single direction.

3. The circuit breaker drive mechanism according to claim 1, characterized in that, The cam (300) is a disc cam, and the follower (400) includes a follower body (410) with a hole (420) inside the follower body (410), wherein the outer edge (310) of the cam is configured to continuously contact at least a portion of the inner wall (421) of the hole.

4. The circuit breaker drive mechanism according to claim 3, characterized in that, The cam (300) is an eccentric disc cam with a circular cross-section. The inner wall (421) of the hole has a first inner wall section (4211) and a second inner wall section (4212) that are opposite to each other in the moving direction of the follower (400). The first inner wall section (4211) and the second inner wall section (4212) are parallel to each other and orthogonal to the moving direction of the follower (400). The distance between the first inner wall section (4211) and the second inner wall section (4212) is equal to the diameter of the cross-section of the cam (300).

5. The circuit breaker drive mechanism according to claim 4, characterized in that, The inner wall (421) of the hole has a racetrack-shaped overall shape.

6. The circuit breaker drive mechanism according to claim 3, characterized in that, The driven body (410) forms a closed frame shape around the hole (420).

7. The circuit breaker drive mechanism according to claim 3, characterized in that, The guide (500) includes a first guide rod (510) and a second guide rod (520). The first guide rod and the second guide rod extend along the moving direction of the follower (400) and are respectively disposed on both sides of the follower body (410). The follower (400) includes one or more guide portions on each side of the follower body (410). Each guide portion is sleeved on a corresponding one of the first guide rod (510) and the second guide rod (520) so that the follower (400) can move along the first guide rod (510) and the second guide rod (520).

8. The circuit breaker drive mechanism according to any one of claims 1 to 7, characterized in that, It also includes a gear assembly (710) disposed between the servo motor (100) and the cam (300).

9. The circuit breaker drive mechanism according to claim 1, characterized in that, The circuit breaker drive mechanism (10) does not include a damping mechanism in the transmission chain from the output shaft (110) of the servo motor to the follower (400) of the cam assembly.

10. A circuit breaker, characterized in that, The circuit breaker includes a circuit breaker drive mechanism (10) according to any one of claims 1 to 9, and the circuit breaker is a medium-voltage circuit breaker.

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