A transmission mechanism and circuit breaker

Abstract

The application provides a transmission mechanism and a circuit breaker, which comprise a driving motor, a handle mechanism and a gear transmission mechanism arranged between the driving motor and the handle mechanism. The driving motor drives the gear transmission mechanism to move and further drives the handle mechanism to perform the opening and closing actions. The gear transmission mechanism comprises a first transmission gear for transmitting the driving force of the driving motor, a second transmission gear for driving the handle mechanism to open and close, and a driven gear located between the first transmission gear and the second transmission gear. The second transmission gear is provided with a plurality of uniformly distributed meshing teeth. The driven gear has a first position abutting against the most end position meshing tooth. When the driven gear is located at the first position, the handle is in the closed state. The transmission mechanism and the circuit breaker can solve the problem that the handle is stuck in the middle and the circuit breaker cannot be powered on by pushing the handle in the prior art.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a transmission mechanism and a circuit breaker. Background Technology

[0002] A circuit breaker is an electrical device that plays an important protective role in a circuit. Its main function is to quickly disconnect the circuit when abnormal conditions such as overload, short circuit, or leakage occur, so as to protect electrical equipment from damage and ensure the safety of personnel using electricity. In the current technology, circuit breakers generally have a handle, a gear transmission mechanism that drives the handle, and a motor that drives the gear transmission mechanism. The motor can drive the handle to close the circuit breaker by rotating continuously in one direction. However, when the power fails during the closing process and the motor stops rotating, the handle will be stuck in the middle state because the motor and the gear transmission mechanism are in a meshed state and cannot rotate. At this time, it is impossible to close the circuit breaker by pushing the handle. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that when the power fails during the closing process and the motor stops rotating, the motor and the gear transmission mechanism are in a meshing state and cannot rotate, and the handle will be stuck in the middle state. At this time, it is impossible to close the circuit breaker by pushing the handle. Thus, a transmission mechanism and circuit breaker are provided that can be closed by manually pushing the handle even when the closing fails due to abnormal conditions.

[0004] To this end, the present invention provides a transmission mechanism, including a drive motor, a handle mechanism, and a gear transmission mechanism disposed between the drive motor and the handle mechanism. The drive motor drives the gear transmission mechanism to move, thereby driving the handle mechanism to perform opening and closing actions. The gear transmission mechanism includes a first transmission gear for transmitting the driving force of the drive motor, a second transmission gear for driving the handle mechanism to open and close, and a driven gear located between the first transmission gear and the second transmission gear. The second transmission gear is provided with a plurality of evenly distributed meshing teeth. The driven gear has a first position that abuts against the meshing teeth at the outermost position. When the driven gear is in the first position, the handle is in the closed state.

[0005] Furthermore, a connecting rod is provided between the second transmission gear and the handle mechanism. One end of the connecting rod is rotatably connected to the second transmission gear, and the other end is fixed to the handle mechanism. The handle mechanism has an open position that can be turned towards one end and an closed position that can be turned towards the other end.

[0006] Furthermore, a reset spring is provided on the second transmission gear, which is used to assist the handle mechanism in switching back and forth between the open and closed positions.

[0007] Furthermore: the reset spring is disposed on the side of the second transmission gear, and the second transmission gear is provided with an extended rib that abuts against the reset spring.

[0008] Furthermore, a protrusion is provided at the center of the second transmission gear, one end of the return spring is fixed to the outside of the protrusion, and the other end is movably connected to the connecting rod.

[0009] Furthermore, the second transmission gear is provided with an arc-shaped movement groove for the auxiliary handle mechanism to move between the open and closed positions, and the side of the connecting rod facing away from the handle mechanism is located in the arc-shaped movement groove.

[0010] Furthermore: the first transmission gear includes a first driving gear meshing with the drive motor and a first driven gear coaxially arranged with the first driving gear. The driven gear is provided with a second driving gear meshing with the first driven gear and a second driven gear meshing with the second driving gear. The second driven gear meshes with the meshing teeth on the second transmission gear.

[0011] Furthermore: a positioning post is provided on the side of the second transmission gear, one end of the reset spring is sleeved on the positioning post, and the other end abuts against the extended protrusion.

[0012] A circuit breaker, comprising the aforementioned transmission mechanism.

[0013] The technical solution of this invention has the following advantages: 1. The present invention provides a transmission mechanism in which a worm gear is connected to a motor, the worm gear drives a first transmission gear to move, the first transmission gear drives a driven gear to move, the driven gear drives a second transmission gear to move, and the second transmission gear drives a handle to open and close the brake. Compared with the prior art, the second transmission gear is provided with several meshing teeth. The meshing teeth do not cover the entire circle of the gear. When the handle is closed, the meshing teeth at the very end of the driven gear and the second transmission gear are separated. At this time, even if the motor continues to rotate, the driven gear cannot drive the second transmission gear to rotate, thus avoiding over-closing and the handle being stuck.

[0014] 2. The present invention provides a transmission mechanism in which a connecting rod is provided between the second transmission gear and the handle mechanism to enable the second transmission gear to drive the handle mechanism to rotate. When the second transmission gear rotates, the connecting rod can drive the handle mechanism to move. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the internal gear transmission mechanism of a circuit breaker. Figure 2 This is a schematic diagram of the connection structure between the second transmission gear and the handle mechanism; Figure 3 This is a schematic diagram of the transmission connection structure of a gear transmission mechanism; Figure 4 This is a schematic diagram of another transmission connection structure of the gear transmission mechanism.

[0017] Explanation of reference numerals in the attached figures: 1. Drive motor; 2. Handle mechanism; 3. Gear transmission mechanism; 31. First transmission gear; 311. First driving wheel; 312. First driven wheel; 32. Second transmission gear; 321. Meshing teeth; 322. Extending rib; 323. Protruding column; 33. Driven gear; 331. Second driving wheel; 332. Second driven wheel; 4. Connecting rod; 5. Return spring; 6. Arc-shaped motion groove; 7. Positioning pin. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] Example This embodiment provides a transmission mechanism, including a drive motor 1, a handle mechanism 2, and a gear transmission mechanism 3 disposed between the drive motor 1 and the handle mechanism 2. The drive motor 1 drives the gear transmission mechanism 3 to move, thereby driving the handle mechanism 2 to perform opening and closing actions. The gear transmission mechanism 3 includes a first transmission gear 31 for transmitting the driving force of the drive motor 1, a second transmission gear 32 for driving the handle mechanism 2 to open and close, and a driven gear 33 located between the first transmission gear 31 and the second transmission gear 32. The second transmission gear 32 is provided with a plurality of evenly distributed meshing teeth 321. The driven gear 33 has a first position that abuts against the meshing teeth 321 at the outermost position. When the driven gear 33 is in the first position, the handle is in the closed state.

[0023] The specific improvements mentioned above are as follows: Figure 1 and Figure 2 As shown, a worm gear is connected to the motor, which drives the first transmission gear 31 to move. The first transmission gear 31 drives the driven gear 33 to move, and the driven gear 33 drives the second transmission gear 32 to move. The second transmission gear 32 drives the handle to open and close the brake. Compared with the prior art, the second transmission gear 32 is provided with several meshing teeth 321. The meshing teeth 321 do not cover the entire circle of the gear. When the handle is closed, the driven gear 33 and the meshing teeth 321 at the very end of the second transmission gear 32 are separated. At this time, even if the motor continues to rotate, the driven gear 33 cannot drive the second transmission gear 32 to rotate, thus avoiding over-closing and the handle being stuck.

[0024] Based on the above embodiments: a connecting rod 4 is provided between the second transmission gear 32 and the handle mechanism 2. One end of the connecting rod 4 is rotatably connected to the second transmission gear 32, and the other end is fixed to the handle mechanism 2. The handle mechanism 2 has a disengaged position that can be turned to one end and a closed position that can be turned to the other end.

[0025] The specific improvements mentioned above are as follows: Figures 1-4 As shown, in order for the second transmission gear 32 to drive the handle mechanism 2 to rotate, a connecting rod 4 is provided between the two. When the second transmission gear 32 rotates, the connecting rod 4 can drive the handle mechanism 2 to move.

[0026] Based on the above embodiments: a reset spring 5 is provided on the second transmission gear 32, and the reset spring 5 is used to assist the handle mechanism 2 in switching back and forth between the open position and the closed position.

[0027] Based on the above embodiments: the reset spring 5 is disposed on the side of the second transmission gear 32, and the second transmission gear 32 is provided with an extended protruding rib 322 that abuts against the reset spring 5.

[0028] Based on the above embodiment: a protrusion 323 is provided at the center of the second transmission gear 32, one end of the return spring 5 is fixed to the outside of the protrusion 323, and the other end is movably connected to the connecting rod 4.

[0029] The specific improvements mentioned above are as follows: Figure 2 As shown, Example 1: The return spring 5 is located on the side of the second transmission gear 32. One side of the return spring 5 extends out and abuts against the protrusion 323. The function of the return spring 5 is to limit the termination position of the second transmission gear 32. When the driven gear 33 separates from the second transmission gear 32, the second transmission gear 32 resets in the opposite direction (clockwise) under the action of the return spring 5. If the driven gear 33 continues to rotate at this time, due to the elastic potential energy of the return spring 5 itself, the second transmission gear 32 and the driven gear 33 repeat the previous motion cycle. This limiting function ensures that the stopping position of the last tooth of the meshing tooth 321 on the driven gear 33 is always within the movement range of the two adjacent teeth on the driven gear 33 and the second transmission gear 32. This ensures that when the second transmission gear 32 rotates in the opposite direction (counterclockwise to drive the second transmission gear 32 back to the initial position), it smoothly meshes with the second transmission gear 32, avoiding the situation where the driven gear 33 spins freely or gets stuck with the second transmission gear 32.

[0030] Example 2: The reset spring 5 is located at the center of the second transmission gear 32. The reset spring 5 is a torsion spring. One end of the reset spring 5 hooks onto the connecting rod 4 and is limited by the connecting rod 4 to prevent the handle mechanism 2 from being over-closed.

[0031] Based on the above embodiments: the second transmission gear 32 is provided with an arc-shaped motion groove 6 for the auxiliary handle mechanism 2 to move between the open and closed positions, and the side of the connecting rod 4 facing away from the handle mechanism 2 is provided in the arc-shaped motion groove 6.

[0032] The specific improvements mentioned above are as follows: Figure 2 and Figure 4 As shown, the second transmission gear 32 is provided with an arc-shaped motion groove 6. When the closing fails due to an abnormal situation, the manual mechanism can be manually pushed by the handle mechanism 2 to close the product through the coordinated movement of the connecting rod 4.

[0033] Based on the above embodiments: the first transmission gear 31 includes a first driving gear 311 meshing with the drive motor 1 and a first driven gear 312 coaxially arranged with the first driving gear 311. The driven gear 33 is provided with a second driving gear 331 meshing with the first driven gear 312 and a second driven gear 332 meshing with the second driving gear 331. The second driven gear 332 meshes with the meshing teeth 321 on the second transmission gear 32.

[0034] The specific improvements mentioned above are as follows: Figure 3 and Figure 4 As shown, during the transmission process, the worm gear on the drive motor 1 drives the first driving wheel 311 to move. The first driving wheel 311 meshes with the first driven wheel 312. Therefore, when the first driving wheel 311 rotates, it can drive the first driven wheel 312 to rotate. The first driven wheel 312 drives the second driving wheel 331 to move. The second driving wheel 331 drives the second driven wheel 332 to move. The second driven wheel 332 drives the meshing teeth 321 to rotate. In this way, the opening and closing of the handle mechanism 2 can be effectively controlled.

[0035] Based on the above embodiment: a positioning post 7 is provided on the side of the second transmission gear 32, one end of the return spring 5 is sleeved on the positioning post 7, and the other end abuts against the extension rib 322.

[0036] The specific improvements mentioned above are as follows: Figure 2 As shown, a positioning post 7 is provided inside the circuit breaker. With the positioning post 7, the middle position of the reset spring 5 is sleeved on the positioning post 7, and the extended part abuts against the extended protruding rib 322 to prevent the second transmission gear 32 from rotating excessively.

[0037] A circuit breaker, comprising the aforementioned transmission mechanism.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A transmission mechanism, comprising a drive motor (1), a handle mechanism (2), and a gear transmission mechanism (3) disposed between the drive motor (1) and the handle mechanism (2), wherein the drive motor (1) drives the gear transmission mechanism (3) to move, thereby causing the handle mechanism (2) to perform opening and closing actions, characterized in that: The gear transmission mechanism (3) includes a first transmission gear (31) for transmitting the driving force of the drive motor (1), a second transmission gear (32) for driving the handle mechanism (2) to open and close the brake, and a driven gear (33) located between the first transmission gear (31) and the second transmission gear (32). The second transmission gear (32) is provided with a plurality of evenly distributed meshing teeth (321). The driven gear (33) has a first position that abuts against the meshing teeth (321) at the far end position. When the driven gear (33) is in the first position, the handle is in the closed state.

2. The transmission mechanism according to claim 1, characterized in that: A connecting rod (4) is provided between the second transmission gear (32) and the handle mechanism (2). One end of the connecting rod (4) is rotatably connected to the second transmission gear (32), and the other end is fixed to the handle mechanism (2). The handle mechanism (2) has a disengaged position that is turned towards one end and a closed position that is turned towards the other end.

3. The transmission mechanism according to claim 2, characterized in that: The second transmission gear (32) is provided with a reset spring (5), which is used to assist the handle mechanism (2) in switching back and forth between the open position and the closed position.

4. A transmission mechanism according to claim 3, characterized in that: The reset spring (5) is disposed on the side of the second transmission gear (32), and the second transmission gear (32) is provided with an extended protrusion (322) that abuts against the reset spring (5).

5. A transmission mechanism according to claim 3, characterized in that: The second transmission gear (32) has a protrusion (323) at its center. One end of the return spring (5) is fixed to the outside of the protrusion (323), and the other end is movably connected to the connecting rod (4).

6. A transmission mechanism according to claim 5, characterized in that: The second transmission gear (32) is provided with an arc-shaped motion groove (6) for the auxiliary handle mechanism (2) to move between the open and closed positions. The connecting rod (4) is located in the arc-shaped motion groove (6) on the side facing away from the handle mechanism (2).

7. A transmission mechanism according to claim 1, characterized in that: The first transmission gear (31) includes a first driving gear (311) meshing with the drive motor (1) and a first driven gear (312) coaxially arranged with the first driving gear (311). The driven gear (33) is provided with a second driving gear (331) meshing with the first driven gear (312) and a second driven gear (332) meshing with the second driving gear (331). The second driven gear (332) meshes with the meshing teeth (321) on the second transmission gear (32).

8. A transmission mechanism according to claim 4, characterized in that: The second transmission gear (32) is provided with a positioning post (7) on its side. One end of the return spring (5) is sleeved on the positioning post (7), and the other end abuts against the extension rib (322).

9. A circuit breaker, characterized in that: The transmission mechanism includes any one of claims 1-8.

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