Speed regulating switch with brake

Abstract

The utility model relates to a kind of speed regulation switch with brake, including front shell and rear shell, and the outside between front shell and rear shell is equipped with buckling device, brake device and switch mechanism are equipped in buckling device, the upper of buckling device is equipped with reversing device, and stabilizing mechanism is equipped in reversing device. Inclined mechanism is equipped in brake device, the side of buckling device is equipped with speed regulation device, circuit board assembly is equipped in speed regulation device, and limiting mechanism is equipped between buckling device and circuit board assembly. The utility model is equipped with a slope in the contact surface of sliding rod and brake metal block, brake metal block presents inclined state when speed regulation switch is in closed state, when speed regulation switch is disconnected, one end of brake metal block is contacted with a motor electrode piece first, then the other end is contacted with another motor electrode piece, avoid unstable contact caused by brake metal block jumping or uneven brake spring force when contacting simultaneously, overcome the deficiencies in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of speed control switch products, and in particular to a speed control switch with a brake. Background Technology

[0002] Power tools offer numerous advantages, including ease of operation, high efficiency, labor saving, and time saving. Handheld power tools are gradually replacing manual tools and are widely used. Power tools typically include a speed control switch with a braking mechanism. This mechanism short-circuites the motor electrodes when the power tool is disconnected, creating a closed-loop current that quickly eliminates the back electromotive force (Back EMF) generated by the motor rotor cutting the stator's magnetic field due to inertial rotation, thus rapidly stopping the power tool motor. However, existing speed control switches have the following drawbacks: (1) The brake terminal set by pressing the sliding rod contacts the two terminals of the motor electrode simultaneously through the brake spring. Although this design is simple and direct, it has some problems. For example, under long-term use or heavy load, the contact surface between the brake mechanism and the electrode terminal may become poor due to friction and wear, which will affect the stability and reliability of the brake. This not only affects the efficiency of the power tool, but may also bring safety hazards. (2) Due to the lack of a limit on the direction of the sliding rod, some users are used to making the sliding rod tilt towards the PCB board. After long-term use, the sliding rod will rub against the PCB board, causing the circuit inside the PCB board to be worn out and the switch to fail. (3) Most of the commutation mechanisms in speed control switches use a single spring to provide contact force for the commutation terminals. This often results in unstable contact between the commutation terminals and the motor electrode terminals and power supply terminals, causing abnormal start-up of the speed control switch.

[0003] To overcome the aforementioned problems, we invented a speed control switch with a brake. Utility Model Content

[0004] The purpose of this invention is to solve the problems of existing speed control switches, where the brake terminal simultaneously contacts two motor electrode terminals. Friction and wear on the contact surfaces lead to poor contact, affecting the stability and reliability of the brake and posing safety hazards. Some users habitually tilt the sliding rod towards the PCB board, causing friction between the sliding rod and the PCB board over time, resulting in circuit breakage and switch failure. The commutation mechanism uses a single spring to provide contact force to the commutation terminal, leading to unstable contact between the commutation terminal and the motor electrode and power supply terminals, causing abnormal start-up of the speed control switch. The specific solution is as follows: A speed control switch with a brake includes a front housing and a rear housing. A clamping device is provided between the front and rear housings and on their outer sides. The clamping device contains a braking device and a switching mechanism. A reversing device is provided above the clamping device, and a stabilizing mechanism is provided in the reversing device. The braking device includes a tilting mechanism. A speed control device is provided on one side of the clamping device, and a circuit board assembly is provided in the speed control device. A limiting mechanism is provided between the clamping device and the circuit board assembly.

[0005] Furthermore, the fastening device includes a slide rod and two slide rails located on the rear shell side, extending outward and parallel to the slide rod and located on its upper and lower sides. It also includes a fastening handle sleeved on the outer end of the slide rod and slidable inward and outward along the two slide rails. The inner end of the slide rod is provided with a spring cavity and a first spring disposed therein.

[0006] Furthermore, the braking device includes a brake metal block and a brake spring, as well as a motor electrode plate one and a motor electrode plate two that are electrically in contact with both ends of the brake metal block, and the tilting mechanism is a first inclined block.

[0007] Furthermore, one end of the brake spring is sleeved on the bottom post of the Y-shaped cavity in the middle of the rear shell side of the slide rod, and the other end of the brake spring abuts against the top of the Z-shaped brake metal block. The Z-shaped brake metal block matches the opening of the Y-shaped cavity, and the inclined surface of the first inclined block faces the inner side of the top of the Z-shaped brake metal block and can contact it.

[0008] Furthermore, the switching mechanism includes a second inclined block located on the lower part of the rear shell side of the slide rod and a trapezoidal groove connected to the second inclined block, and also includes a movable switch piece that can contact the second inclined block and the trapezoidal groove, a power supply negative electrode piece electrically connected to one end of the movable switch piece, and a switching negative electrode piece that is connected or disconnected to the other end of the movable switch piece. The movable switch piece is bent downward at both ends, and a switch spring is provided on the lower side of the middle part of the movable switch piece.

[0009] Furthermore, the commutation device includes two commutation segments, two power supply segments, and two motor electrode segments, and also includes a commutation lever sleeved on the two commutation segments and a positioning spring, a positioning block, and a positioning groove disposed at the front end of the commutation lever. The stabilizing mechanism consists of two parallel and balanced commutation springs respectively disposed on the upper side of the two commutation segments and between the commutation lever.

[0010] Furthermore, the limiting mechanism includes a first limiting strip and an upper limiting edge adjacent to the first limiting strip on the upper part of the rear shell side of the slide rod, a lower limiting groove in the middle of the rear shell side of the slide rod, and a second limiting strip, an upper limiting strip, and a lower limiting protrusion in the corresponding part of the rear shell. The first limiting strip matches and slides against the second limiting strip, the upper limiting edge matches and slides against the upper limiting strip, and the lower limiting protrusion matches and slides against the lower limiting groove.

[0011] Furthermore, the speed regulating device includes a speed regulating spring on the front housing side of the slide rod, a speed regulating circuit and multiple speed regulating contacts on the circuit board assembly.

[0012] Furthermore, a protection diode is provided below the switching mechanism.

[0013] Furthermore, the circuit board assembly has a MOS transistor on the side near the front housing. The main body of the MOS transistor is embedded in the opening of the front housing, and the MOS transistor is connected to a heat dissipation mechanism located on the outer surface of the front housing by screws.

[0014] In summary, the technical solution of this utility model has the following beneficial effects: This invention solves the problem of existing speed control switches where the brake terminal simultaneously contacts two motor electrode terminals, leading to poor contact due to friction and wear, affecting the stability and reliability of the brake and posing safety hazards. Some users habitually tilt the sliding rod towards the PCB board, causing friction between the sliding rod and the PCB board over time, resulting in circuit breakage and switch failure. The commutation mechanism uses a single spring to provide contact force to the commutation terminal, resulting in unstable contact between the commutation terminal and the motor electrode terminal and power supply terminal, causing abnormal start-up of the speed control switch. This invention provides a simple and stable braking device. An inclined surface (first inclined block) is provided on the contact surface between the slide rod and the brake metal block (i.e., the inner top surface of the U-shaped part). When the speed control switch is closed (i.e., the lever is pressed firmly), the brake metal block is tilted. When the speed control switch is open (i.e., the lever is released), one tilted end of the brake metal block first contacts one motor electrode (e.g., motor electrode one), and then the other end contacts another motor electrode (e.g., motor electrode two). (At this time, both ends of the brake metal block simultaneously contact two motor electrodes, generating a motor braking and stopping effect.) This avoids contact instability caused by the brake metal block bouncing or uneven distribution of brake spring force during simultaneous contact, overcoming the shortcomings of existing technologies. Simultaneously, a limiting mechanism is provided between the slide rod and the rear housing, increasing the constraint between the slide rod and the circuit board assembly, preventing wear on the PCB board of the circuit board assembly during prolonged use, thereby increasing the service life of the speed control switch. Meanwhile, two commutation springs are installed at the positions of the commutation lever and the corresponding commutation segments. This ensures that there is spring force near the contact points between the commutation segments and the power supply segments and motor electrode segments, avoiding abnormalities caused by uneven distribution of commutation force and preventing poor contact caused by vibration during use of the power tool, thereby improving product stability and quality. The first and second inclined blocks on the slide rod of this design are staggered to function, ensuring that the slide rod connects the power supply when the handle is pressed tightly and brakes the motor when the handle is released. This design is simple, compact, space-saving, safe, reliable, and easy to operate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Figure 1 This is a structural diagram of a speed control switch with a brake according to the present invention. Figure 2 for Figure 1 Structural diagram after removing the heat dissipation mechanism. Figure 3This is a rear structural diagram of the speed control switch of this utility model. Figure 4 This is a diagram showing the internal structure of the present invention after removing the front shell and the reversing lever. Figure 5 This is a diagram of the internal structure of the present invention after the back cover has been removed. Figure 6 This is a schematic diagram of the limiting mechanism of this utility model. Figure 7 This is a structural diagram of the rear shell of this utility model. Figure 8 This is a structural diagram of the front shell of this utility model. Figure 9 This is a structural diagram of the slide bar of this utility model. Figure 10 This is another structural diagram of the slide bar of this utility model. Figure 11 This is a schematic diagram showing how the first inclined block of this utility model causes one end of the brake metal block to contact the first motor electrode plate.

[0016] Explanation of reference numerals in the attached figures: 10-Front shell, 11-Semi-circular shaft hole, 12-Window, 13-Screw, 14-Heat sink, 15-Sealing ring, 16-Positioning post, 20-Rear shell, 21-Slide rail, 22-Second limit bar, 23-Upper limit bar, 24-Lower limit protrusion, 25-Screw hole, 26-Support plate, 30-Circuit board assembly, 31-MOS transistor, 32-Protection diode, 40-Slide rod, 401-Y-shaped cavity, 402-Bottom post, 403-First limit bar, 404-Upper limit edge, 405-Lower limit groove, 406-Cross groove, 407-Fixing post, 41-Snap handle, 42-Spring cavity, 43-First spring 44-Dustproof ring, 45-First inclined block, 46-Second inclined block, 47-Trapezoidal groove, 48-Speed ​​regulating spring, 50-Brake metal block, 501-Z-shaped, 51-Brake spring, 60-Motor electrode plate one, 61-Motor electrode plate two, 70-Moving switch plate, 71-Power supply negative electrode plate, 72-On / off negative electrode plate, 73-Switch spring, 74-Power supply positive electrode plate, 80-Reversing plate, 81-Power supply plate, 82-Motor electrode plate, 83-Reversing lever, 830-Rotating shaft, 831-Pulley, 84-Positioning spring, 85-Positioning block, 86-Positioning groove, 87-Reversing spring, 88-Positioning seat block. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] like Figures 1 to 11 As shown, a speed control switch with a brake includes a front housing 10 and a rear housing 20. A clamping device is provided between the front housing 10 and the rear housing 20 and on their outer sides. The clamping device contains a braking device and a switching mechanism. A reversing device is provided above the clamping device, and a stabilizing mechanism is provided in the reversing device. The braking device includes a tilting mechanism. A speed control device is provided on one side of the clamping device, and a circuit board assembly 30 is provided in the speed control device. A limiting mechanism is provided between the clamping device and the circuit board assembly 30. To improve assembly efficiency and facilitate operation, the front housing 10 and the rear housing 20 are joined together by a bayonet and locking block matching method.

[0019] Specifically, the clamping device includes a slide rod 40 and two slide rails 21 extending outward from one side of the rear housing, parallel to the slide rod 40, and located above and below it. It also includes a clamping handle 41 fitted onto the outer end of the slide rod 40 and sliding inward and outward along the two slide rails 21. The inner end of the slide rod 40 has a spring cavity 42 and a first spring 43 located therein. To prevent dust and debris from entering the speed control switch, a dustproof ring 44 is provided between the joint between the front housing 10 and the rear housing 20 and between the slide rod 40. To reduce resistance and wear and make pressing the speed control switch easier, a suitable amount of lubricating oil can be applied to the slide rod 40 and the slide rails 21.

[0020] Specifically, the braking device includes a brake metal block 50 and a brake spring 51, as well as a motor electrode plate 60 and a motor electrode plate 61 that are electrically in contact with both ends of the brake metal block 50, and the tilting mechanism is a first inclined block 45.

[0021] Specifically, one end of the brake spring 51 is sleeved on the bottom post 402 of the Y-shaped cavity 401 in the middle of the rear housing side of the slide rod 40, and the other end of the brake spring 51 abuts against the top of the Z-shaped 501 of the brake metal block 50. The Z-shaped 501 of the brake metal block 50 matches the opening of the Y-shaped cavity 401, and the inclined surface of the first inclined block 45 faces the top inner side of the Z-shaped 501 of the brake metal block 50 and can contact it. The uniquely designed first inclined block 45 allows the top of the U-shaped 501 of the brake metal block 50 to tilt when the speed control switch is on. However, before the lever 41 is fully released after the speed control switch is off, a process occurs where the top of the U-shaped 501 changes from tilted to straight. The technical effect is that after the speed control switch is off, before the brake metal block 50 prepares to brake, it performs a special process: one end of the brake metal block 50 first contacts the motor electrode plate 60 (at this time, the other end is still not disconnected from the motor electrode plate 61, see...). Figure 11 (As shown), then, while one end of the brake metal block 50 remains in contact with the motor electrode plate 60, the other end of the brake metal block 50 contacts the motor electrode plate 61. At this time, both ends of the brake metal block 50 simultaneously contact both ends of the motor electrode plate (see...). Figure 5 As shown in the diagram, the reverse electromotive force generated by the motor rotor cutting the stator magnetic field due to inertial rotation is quickly eliminated, and the power tool motor stops rapidly. The first inclined block 45 in this design, from its position on the inner top of the U-shaped 501 that is tightly attached to the brake metal block 50 until it completely detaches, ensures that the two ends of the brake metal block 50 do not simultaneously contact both electrode plates of the motor. Instead, it contacts one electrode plate first and then both electrode plates simultaneously. This avoids the instability caused by the brake metal block jumping 50 or uneven force distribution of the brake spring 51 during simultaneous contact, improving the reliability of the speed control switch's braking and stopping function, and enhancing the safety of the power tool.

[0022] Specifically, the switching mechanism includes a second inclined block 46 located on the lower part of the slide rod 40 facing the rear housing, and a trapezoidal groove 47 laterally connected to the second inclined block 46. It also includes a movable switch piece 70 that can contact the second inclined block 46 and the trapezoidal groove 47, a power supply negative electrode piece 71 electrically connected to one end of the movable switch piece 70, and a switching negative electrode piece 72 that is connected or disconnected to the other end of the movable switch piece 70. The movable switch piece 70 is bent downwards at both ends, and a switch spring 73 is provided on the lower side of the middle part of the movable switch piece 70. The upper end of the switch spring 73 is fitted onto a spring post (not shown in the figure) on the lower side of the movable switch piece 70, and the lower end of the switch spring 73 is fitted onto a spring post (not shown in the figure) of the support plate 26 in the middle of the rear housing 20. The second inclined block 46 and trapezoidal groove 47 of this design make full use of the structural space of the slide bar 40, and combine the switching and braking functions into the two processes of pressing in or popping out of the slide bar 40, so that the slide bar 40 has the advantages of dual function and convenient operation.

[0023] Specifically, the commutation device includes two commutator segments 80, two power supply segments 81, and two motor electrode segments 82. It also includes a commutation lever 83 sleeved on the two commutator segments 80, and a positioning spring 84, a positioning block 85, and a positioning groove 86 located at the front end of the commutation lever 83. The stabilizing mechanism consists of two parallel and balanced commutation springs 87 respectively located on the upper side of the two commutator segments 80 and between the commutation lever 83. A rotating shaft 830 is located in the middle of the commutation lever 83, which is embedded in two semi-circular shaft holes 11 on the upper side of the front housing 10 and the rear housing 20. A shift post 831 is located at the rear end of the commutation lever 83, and three positioning grooves 86 are located on the positioning seat block 88. In this design, the upper end of motor electrode plate 60 is integrated with a power supply plate 81 and electrically connected to a motor electrode plate 82 via a commutator 80. The upper end of motor electrode plate 61 is integrated with another power supply plate 81 and electrically connected to another motor electrode plate 82 via another commutator 80. The lower end of motor electrode plate 61 is integrated with the positive power supply plate 74. This design has the advantages of simplified structure, saving internal space of the speed control switch, and saving the amount of conductive sheet material. The outer ends of the positive power supply plate 74 and the negative power supply plate 71 are located on the lower side of the rear housing 20, and the outer ends of the two motor electrode plates 82 are located on the rear side of the rear housing 20. The commutator lever 83 of this design cooperates with three positioning slots 86 (i.e., left, middle, and right slots) to achieve three stable states: turning the lever to the middle slot turns off the motor, turning the lever to the left slot turns the motor forward, and turning the lever to the right slot turns the motor backward. When the reversing lever 83 is in the middle slot, the two reversing segments 80 are suspended and do not contact the two motor electrode plates 82. This means that the two power supply segments 81 are not supplying power to the two motor electrode plates 82. This effectively prevents accidental contact with the handle 41 and avoids unsafe situations caused by the motor rotating erratically, thus improving the safety of using the power tool. The two power supply segments 81 (one is the positive power supply segment and the other is the negative power supply segment) and the two motor electrode plates 82 (one connected to the positive power supply segment and the other to the negative power supply segment) are four structurally different and independent components. In this design, the two reversing segments 80 have the same structure. Both ends of the reversing segment 80 are bent upwards and inserted into the square holes (not shown in the figure) corresponding to the reversing lever 83. The reversing spring 87 is fitted into the round hole (not shown in the figure) corresponding to the reversing lever 83.

[0024] Specifically, the limiting mechanism includes a first limiting strip 403 and an upper limiting edge 404 adjacent to the first limiting strip 403 on the upper part of the rear housing side of the slide rod 40, a lower limiting groove 405 in the middle of the rear housing side of the slide rod 40, and a second limiting strip 22, an upper limiting strip 23, and a lower limiting protrusion 24 in the corresponding part of the rear housing 20. The first limiting strip 403 matches and slides against the second limiting strip 22 to limit the gap between the slide rod 40 and the circuit board assembly 30, effectively preventing the operator from habitually tilting towards the circuit board assembly 30 when pressing the handle 41, causing friction against the PCB board and breaking the circuit, resulting in switch failure. The upper limiting edge 404 matches and slides against the upper limiting strip 23 to prevent the slide rod 40 from tilting upwards when sliding. The lower limiting protrusion 24 matches and slides against the lower limiting groove 405 to prevent the slide rod 40 from tilting downwards when sliding.

[0025] Specifically, the speed regulating device includes a speed regulating spring 48 disposed on the front housing side of the slide rod 40, and a speed regulating circuit and multiple speed regulating contacts (not shown in the figure) disposed on the circuit board assembly 30. In order to improve the reliability of the speed regulating spring 48 and avoid deviation during sliding, a cross groove 406 is provided on the slide rod 40 for placing and limiting the speed regulating spring 48, and a fixing post 407 is provided to fix the speed regulating spring 48 and heat-melt the end of the fixing post 407 to prevent it from falling off.

[0026] Specifically, a MOSFET 31 is located on the front housing 10 side of the circuit board assembly 30. The main body of the MOSFET 31 is embedded in the opening 12 of the front housing 10. The MOSFET 31 is connected to a heat dissipation mechanism (such as a heat sink 14) located on the outer surface of the front housing 10 by screws 13. The screws 13 are fastened to screw holes 25 located on the rear housing 20. Two positioning posts 16 are also provided on the outer surface of the front housing 10 to position the heat sink 14, thereby reducing the number of screws. The heat sink 14 is designed to fit against the outer surface of the front housing 10, which has the advantages of good heat dissipation and space saving. In order to protect the electronic components in the speed control switch from dust, a sealing ring 15 is also provided in the opening 12.

[0027] Specifically, a protection diode 32 is provided below the switching mechanism, which can effectively form a circuit for the reverse electromotive force generated by the inertial rotation of the motor rotor cutting the stator magnetic field, quickly consume this reverse electromotive force, and prevent it from causing breakdown damage to the MOSFET 31.

[0028] The speed control switch in this solution is installed as an accessory inside the power tool (not shown in the figure). The motor and power supply (battery) mentioned in this case are components of the power tool. Since the power tool is existing technology, its specific structure and working principle will not be described in detail here.

[0029] In summary, the technical solution of this utility model has the following beneficial effects: This invention solves the problem of existing speed control switches where the brake terminal simultaneously contacts two motor electrode terminals, leading to poor contact due to friction and wear, affecting the stability and reliability of the brake and posing safety hazards. Some users habitually tilt the sliding rod towards the PCB board, causing friction between the sliding rod and the PCB board over time, resulting in circuit breakage and switch failure. The commutation mechanism uses a single spring to provide contact force to the commutation terminal, resulting in unstable contact between the commutation terminal and the motor electrode terminal and power supply terminal, causing abnormal start-up of the speed control switch. This invention provides a simple and stable braking device. An inclined surface (first inclined block) is provided on the contact surface between the slide rod and the brake metal block (i.e., the inner top surface of the U-shaped part). When the speed control switch is closed (i.e., the lever is pressed firmly), the brake metal block is tilted. When the speed control switch is open (i.e., the lever is released), one tilted end of the brake metal block first contacts one motor electrode (e.g., motor electrode one), and then the other end contacts another motor electrode (e.g., motor electrode two). (At this time, both ends of the brake metal block simultaneously contact two motor electrodes, generating a motor braking and stopping effect.) This avoids contact instability caused by the brake metal block bouncing or uneven distribution of brake spring force during simultaneous contact, overcoming the shortcomings of existing technologies. Simultaneously, a limiting mechanism is provided between the slide rod and the rear housing, increasing the constraint between the slide rod and the circuit board assembly, preventing wear on the PCB board of the circuit board assembly during prolonged use, thereby increasing the service life of the speed control switch. Meanwhile, two commutation springs are installed at the positions of the commutation lever and the corresponding commutation segments. This ensures that there is spring force near the contact points between the commutation segments and the power supply segments and motor electrode segments, avoiding abnormalities caused by uneven distribution of commutation force and preventing poor contact caused by vibration during use of the power tool, thereby improving product stability and quality. The first and second inclined blocks on the slide rod of this design are staggered to function, ensuring that the slide rod connects the power supply when the handle is pressed tightly and brakes the motor when the handle is released. This design is simple, compact, space-saving, safe, reliable, and easy to operate.

[0030] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A speed control switch with a brake, comprising a front housing and a rear housing, characterized in that: A clamping device is provided between the front and rear shells and on the outside. The clamping device is equipped with a braking device and a switching mechanism. A reversing device is provided above the clamping device. The reversing device is equipped with a stabilizing mechanism. The braking device is equipped with a tilting mechanism. A speed regulating device is provided on one side of the clamping device. The speed regulating device is equipped with a circuit board assembly. A limiting mechanism is provided between the clamping device and the circuit board assembly.

2. The speed control switch with brake according to claim 1, characterized in that: The fastening device includes a slide rod and two slide rails located on one side of the rear shell, extending outward and parallel to the slide rod and located on its upper and lower sides. It also includes a fastening handle sleeved on the outer end of the slide rod and slidable inward and outward along the two slide rails. The inner end of the slide rod is provided with a spring cavity and a first spring disposed therein.

3. The speed control switch with brake according to claim 2, characterized in that: The braking device includes a brake metal block and a brake spring, as well as a motor electrode plate one and a motor electrode plate two that are electrically in contact with both ends of the brake metal block, and the tilting mechanism is a first inclined block.

4. The speed control switch with brake according to claim 3, characterized in that: One end of the brake spring is sleeved on the bottom post of the Y-shaped cavity in the middle of the rear shell side of the slide rod, and the other end of the brake spring abuts against the top of the Z-shaped brake metal block. The Z-shaped brake metal block matches the opening of the Y-shaped cavity, and the inclined surface of the first inclined block faces the inner side of the top of the Z-shaped brake metal block and can contact it.

5. A speed control switch with brake according to claim 2, characterized in that: The switching mechanism includes a second inclined block located on the lower part of the rear shell side of the slide rod and a trapezoidal groove connected to the second inclined block. It also includes a movable switch piece that can contact the second inclined block and the trapezoidal groove, a power supply negative electrode piece electrically connected to one end of the movable switch piece, and a switching negative electrode piece that is connected or disconnected to the other end of the movable switch piece. The movable switch piece is bent downward at both ends, and a switch spring is provided on the lower side of the middle part of the movable switch piece.

6. A speed control switch with brake according to claim 1, characterized in that: The commutation device includes two commutation segments, two power supply segments, and two motor electrode segments. It also includes a commutation lever sleeved on the two commutation segments and a positioning spring, a positioning block, and a positioning groove located at the front end of the commutation lever. The stabilization mechanism consists of two parallel and balanced commutation springs respectively located on the upper side of the two commutation segments and between the commutation lever.

7. A speed control switch with brake according to claim 2, characterized in that: The limiting mechanism includes a first limiting strip and an upper limiting edge adjacent to the first limiting strip on the upper part of the rear shell side of the slide rod, a lower limiting groove in the middle of the rear shell side of the slide rod, and a second limiting strip, an upper limiting strip, and a lower limiting protrusion in the corresponding part of the rear shell. The first limiting strip and the second limiting strip match and slide against each other, the upper limiting edge matches and slides against the upper limiting strip, and the lower limiting protrusion matches and slides against the lower limiting groove.

8. A speed control switch with brake according to claim 2, characterized in that: The speed regulating device includes a speed regulating spring on the front housing side of the slide rod, a speed regulating circuit and multiple speed regulating contacts on the circuit board assembly.

9. A speed control switch with a brake according to claim 1, characterized in that: A protection diode is provided below the switching mechanism.

10. A speed control switch with a brake according to claim 1, characterized in that: The circuit board assembly has a MOS transistor on the side near the front housing. The main body of the MOS transistor is embedded in the opening of the front housing. The MOS transistor is connected to a heat dissipation mechanism located on the outer surface of the front housing by screws.

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