Compact direct-current brushless switch

Abstract

The utility model belongs to a motor control switch, in particular to a compact direct-current brushless switch, which comprises a switch main body and a push rod assembly, the push rod assembly comprises a push rod, and one side of the push rod is clamped with a button; the switch body comprises a base and an upper cover, a limiting piece is arranged on one side, close to the button, of the base, limiting guide rails are arranged on the limiting piece and located on the two sides of the button, guide columns are arranged on the button and located at the corresponding positions of the limiting guide rails, and the guide columns can move up and down relative to the limiting guide rails. One side of the switch main body is rotatably connected with a swing component, a limiting piece is additionally arranged on the base, a limiting guide rail is arranged on the limiting piece, so that a guide column and a push rod can move up and down relative to the switch main body in the vertical direction, scraping and clamping stagnation are generated between the guide column and the periphery, an electric drill is clamped, and the stability of a product is improved.

Description

Technical Field

[0001] This utility model relates to a motor control switch, specifically a compact DC brushless switch. Background Technology

[0002] Brushless DC switches are widely used in various brushless power tools, mainly in electric drills, hammer drills, cutting machines, blowers, and vacuum cleaners. Their structure includes a base and a push rod assembly, a rocker arm assembly, and a circuit board housed within the base. The push rod assembly includes a push rod and speed-regulating brushes mounted on it. The rocker arm assembly includes a rocker arm, a movable block connected to the rocker arm, and commutating brushes mounted on the movable block. The speed-regulating brushes slide against speed-regulating contacts on the circuit board, and the commutating brushes also slide against commutating contacts on the circuit board. A set of MOSFETs is located at the bottom of the circuit board. Pressing a switch button drives the push rod assembly to slide down, causing the speed-regulating brushes mounted on the sliding block to slide on the speed-regulating contacts (carbon film or gold film) on the circuit board. The resistance of the speed-regulating contacts gradually changes, and the chip on the circuit board changes the duty cycle of the MOSFETs, thereby changing the output voltage on the circuit board. The input DC power is converted into three-phase AC voltage through related circuits on the circuit board, which is then used to power the motor, driving the brushless motor. The left and right movement of the rocker arm assembly enables the motor to rotate in both directions.

[0003] The disadvantages of traditional brushless DC switches are:

[0004] 1. DC brushless switches are available in various sizes to suit different power tools (such as drills). Compact switches use a spring-loaded mechanism at the bottom for adjusting the rotation direction. However, the limited internal space in compact switches prevents the spring from being too large. This results in insufficient spring rebound force (smaller springs have lower rigidity and are more prone to deformation).

[0005] 2. When pressing the trigger, the downward pressure of the hand has a certain degree of randomness, so it cannot be guaranteed that the trigger will always move in the vertical direction, which can easily cause it to scrape and jam against the surroundings. In actual use, this can cause the electric drill to get stuck and unable to reset, creating a safety hazard. Utility Model Content

[0006] The purpose of this invention is to provide a compact DC brushless switch to solve the problems mentioned in the background art.

[0007] The technical solution of this utility model is as follows: A compact DC brushless switch includes a switch body and a push rod assembly. The push rod assembly includes a push rod, one side of which is snapped with a button. The switch body includes a base and a top cover. A limiting member is provided on the side of the base near the button. Limiting guide rails are provided on both sides of the button. A guide post is provided at the corresponding position of the button on the limiting guide rail. The guide post can move up and down relative to the limiting guide rail. A swing component assembly is rotatably connected to one side of the switch body.

[0008] Preferably, the ornament assembly includes a swing block located between the base and the top cover. A steel ball is provided on the side of the swing block near the base. A first spring is provided between the steel ball and the swing block. The base is provided with multiple positioning slots. When the swing block is rotated, the steel ball can enter the corresponding positioning slot.

[0009] Preferably, the button is provided with a first limiting groove and a second limiting groove on the side near the ornament assembly; a lever limiting post is provided between the first limiting groove and the second limiting groove; the ornament assembly includes a lever, which can rotate between the first limiting groove and the second limiting groove.

[0010] Preferably, the base and the top cover are respectively provided with a third limiting groove and a fourth limiting groove at both ends of the swing block to prevent the swing component from rotating too much.

[0011] Preferably, a second spring is provided between the push rod and the switch body, so that pressing the button drives the push rod to reciprocate relative to the switch body.

[0012] Preferably, the push rod is provided with a sealing ring inside the switch body, and a dust cover is also provided on the outside of the push rod between the button and the switch body.

[0013] Preferably, the switch body has a circuit board located between the swing component assembly and the push rod assembly. The push rod assembly has two speed-regulating brushes that abut against the circuit board, and the swing component assembly has a reversing brush that abuts against the circuit board.

[0014] Preferably, when the lever is in the first limiting groove, the brushless switch rotates clockwise; when the lever is in the second limiting groove, the brushless switch rotates counterclockwise; when the lever engages with the lever limiting post, the brushless switch stops operating.

[0015] Preferably, the button has an arc shape on the outside, which can reduce wear when used together.

[0016] Preferably, the base and the top cover are connected by a snap-fit, which facilitates disassembly.

[0017] Compared with the prior art, the present invention provides a compact DC brushless switch, which has at least one of the following advantages:

[0018] 1. A limiting component is added to the base. By setting a limiting guide rail on the limiting component, the guide column and push rod can move vertically up and down relative to the switch body, causing them to scrape and jam against the surroundings and causing the electric drill to get stuck, thus improving the stability of the product.

[0019] 2. By setting the third and fourth limit grooves, the position of the lever is limited when it rotates, so as to prevent the lever from being damaged due to excessive rotation during the rotation process, thus preventing it from being effectively limited.

[0020] 3. A steel ball is placed between the swing block and the base, and multiple positioning grooves are provided at the corresponding positions of the steel ball to correspond to different positions, so that the lever can be accurately positioned; a spring is set between the steel ball and the swing block, which can elastically allow the steel ball to enter different positioning grooves, thereby preventing scratching and wear between the positioning groove and the steel ball, which would cause the limit to fail, thus improving product stability and extending product life. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0023] Figure 2 This is a cross-sectional view of an embodiment of the present utility model.

[0024] Figure 3 for Figure 2 A magnified view from direction A.

[0025] Figure 4 This is a diagram showing the state of the lever when it is in the first limiting groove.

[0026] Figure 5 This is a diagram showing the state of the lever when it is in the second limiting groove.

[0027] Figure 6 This is a diagram showing the state of the lever being engaged with the lever limit post.

[0028] Figure 7 This is a schematic diagram of the guide column moving up and down in the limiting guide rail according to an embodiment of the present invention.

[0029] Figure Labels

[0030] 1-Switch body; 11-Base; 111-Limiting component; 112-Limiting guide rail; 113-Positioning groove; 114-Third limiting groove; 12-Top cover; 121-Fourth limiting groove; 2-Push rod assembly; 21-Push rod; 22-Button; 221-Guide post; 222-First limiting groove; 223-Second limiting groove; 224-Toggle lever limiting post; 23-Second spring; 24-Sealing ring; 25-Dust cover; 26-Speed ​​control brush; 3-Swing component assembly; 31-Swing block; 311-Steel ball; 32-First spring; 33-Toggle lever; 34-Reversing brush; 4-Circuit board; Detailed Implementation

[0031] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0032] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0033] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] like Figures 1 to 7 As shown, a compact DC brushless switch includes a switch body 1 and a push rod assembly 2. The push rod assembly 2 includes a push rod 21, one side of which is engaged with a button 22. The switch body 1 includes a base 11 and a top cover 12. The base 11 has a limiting member 111 near the button 22. The limiting member 111 has limiting guide rails 112 on both sides of the button 22. The button 22 has a guide post 221 at a corresponding position on the limiting guide rails 112. The guide post 221 can move up and down relative to the limiting guide rails 112. By adding a limiting member 111 to the base 11 and setting the limiting guide rails 112 on the limiting member 111, the guide post 221 drives the push rod 21 to move up and down vertically relative to the switch body 1. This prevents the button 22 from tilting due to uneven force, thus preventing it from scratching and jamming with its surroundings and improving the stability of the product.

[0037] like Figures 1 to 6As shown, a swing assembly 3 is rotatably connected to one side of the switch body 1. The swing assembly 3 includes a swing block 31, which is located between the base 11 and the upper cover 12. A steel ball 311 is provided on the side of the swing block 31 near the base 11. A first spring 32 is provided between the steel ball 311 and the swing block 31. The base 11 has multiple positioning grooves 113. When the swing block 31 is rotated, the steel ball 311 can enter the corresponding positioning groove 113. The button 22 has a first limiting groove 222 and a second limiting groove 223 on the side near the swing assembly 3. A lever limiting post 224 is provided between the first limiting groove 222 and the second limiting groove 223. The swing assembly 3 includes a lever 33, which can be positioned in the first... The limiting groove 222 rotates between the second limiting groove 223; a steel ball 311 is set between the swing block 31 and the base 11, and multiple positioning grooves 113 are provided at the corresponding positions of the steel ball 311. When the lever 33 rotates to different positions, the steel ball 311 enters the corresponding positioning groove 113, so that the lever 33 can be accurately positioned; a first spring 32 is set between the steel ball 311 and the swing block 31. When the steel ball 311 enters different positioning grooves 113, it can be elastically pushed in, thereby preventing the positioning groove 113 and the steel ball 311 from scratching and wearing each other, which would prevent the limiting from being achieved, thus improving product stability and extending product lifespan; the base 11 and the top cover 12 are respectively provided with third limiting grooves at both ends of the swing block 31. The third limiting groove 114 and the fourth limiting groove 121 prevent the swing component assembly 3 from rotating too much. The third limiting groove 114 and the fourth limiting groove 121 limit the position of the swing block 31 during rotation. When the lever 33 is in the first limiting groove 222, one side of the swing block 31 abuts against the third limiting groove 114. When the lever 33 is in the second limiting groove 222, one side of the swing block 31 abuts against the fourth limiting groove 114, preventing damage due to excessive rotation and ensuring effective positioning. A second spring 23 is provided between the push rod 21 and the switch body 1. Pressing the button 22 drives the push rod 21 to reciprocate relative to the switch body 1. The push rod 21 is located inside the switch body 1. A sealing ring 24 is provided, and a dust cover 25 is also provided on the outside of the push rod 21 between the button 22 and the switch body 1 to reduce dust ingress and prevent excessive internal resistance caused by excessive dust, which would lead to excessive internal temperature rise and reduce the product's service life, thereby improving the product's stability. A circuit board 4 is provided inside the switch body 1, and the circuit board 4 is located between the swing component assembly 3 and the push rod assembly 2. The push rod assembly 2 is provided with two speed-regulating brushes 26 that abut against the circuit board 4, and the swing component assembly 3 is provided with a reversing brush 34 that abuts against the circuit board 4. When the lever 33 is in the first limit groove 222, the brushless switch rotates clockwise; when the lever 33 is in the second limit groove 223, the brushless switch rotates counterclockwise.When the lever 33 engages with the lever limiting post 224, the brushless switch stops operating; the button 22 has an arc shape on the outside, which reduces wear when used together; the base 11 and the top cover 12 are connected by a snap-fit, making disassembly easy.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

Claims

1. A compact brushless DC switch, characterized in that: The switch includes a main body and a push rod assembly. The push rod assembly includes a push rod, one side of which is engaged with a button. The main body includes a base and a top cover. The base has a limiting component near the button. The limiting component has limiting guide rails on both sides of the button. The button has a guide post at a corresponding position on the limiting guide rail. The guide post can move up and down relative to the limiting guide rail. A swing component assembly is rotatably connected to one side of the main body.

2. A compact brushless DC switch as described in claim 1, characterized in that: The ornament assembly includes a swing block located between the base and the top cover. A steel ball is provided on the side of the swing block near the base. A first spring is provided between the steel ball and the swing block. The base is provided with multiple positioning slots. When the swing block is rotated, the steel ball can enter the corresponding positioning slot.

3. A compact brushless DC switch as described in claim 1, characterized in that: The button is provided with a first limiting groove and a second limiting groove on the side near the ornament assembly; a lever limiting post is provided between the first limiting groove and the second limiting groove; the ornament assembly includes a lever, which can rotate between the first limiting groove and the second limiting groove.

4. A compact brushless DC switch as described in claim 2, characterized in that: The base and the top cover are respectively provided with a third limiting groove and a fourth limiting groove at both ends of the swing block to prevent the swing component from rotating too much.

5. A compact brushless DC switch as described in claim 1, characterized in that: A second spring is provided between the push rod and the switch body, and the push rod is driven to reciprocate relative to the switch body by pressing the button.

6. A compact brushless DC switch as described in claim 1, characterized in that: The push rod is equipped with a sealing ring inside the switch body, and a dust cover is also provided on the outside of the push rod between the button and the switch body.

7. A compact brushless DC switch as described in claim 1, characterized in that: The switch body contains a circuit board located between the swing component assembly and the push rod assembly. The push rod assembly has two speed-regulating brushes that abut against the circuit board, and the swing component assembly has commutation brushes that also abut against the circuit board.

8. A compact brushless DC switch as described in claim 3, characterized in that: When the lever is in the first limiting groove, the brushless switch rotates clockwise; when the lever is in the second limiting groove, the brushless switch rotates counterclockwise; when the lever engages with the lever limiting post, the brushless switch stops operating.

9. A compact brushless DC switch as described in claim 1, characterized in that: The button has an arc shape on the outside, which can reduce wear when used together.

10. A compact brushless DC switch as described in claim 1, characterized in that: The base and the top cover are connected by snap-fit, making them easy to disassemble.

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