Direct-current brush integrated speed regulation switch

Abstract

The utility model provides a DC brush integrated speed regulation switch, comprising a housing, a push rod assembly, a commutation assembly, a PCB and a circuit board, the push rod assembly and the commutation assembly are respectively arranged at two sides of the PCB, and one side of the push rod assembly close to the PCB is provided with a first switch electric brush and a second protection electric brush. A first switch circuit and a second protection circuit corresponding to the first switch electric brush and the second protection electric brush respectively are printed on the side, close to the push rod assembly, of the PCB, a commutation electric brush is arranged on the side, close to the PCB, of the commutation assembly, and a commutation circuit corresponding to the commutation electric brush is printed on the side, close to the push rod assembly, of the PCB. According to the utility model, the connecting circuit of the push rod assembly and the commutation assembly is integrated on the PCB, the function of switching the rotation direction of the motor, the function of switching on and off a power supply and the function of starting and stopping protection of the motor are integrated together, and the functions of speed regulation and steering are realized through the cooperation of the electric brush and the circuit of the PCB, so that the production cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a direct current brushed integrated speed regulating switch. Background Art

[0002] Speed ​​control switches are widely used in the field of handheld power tools, such as electric drills, electric grinders, electric wrenches and electric screwdrivers. Speed ​​control switches use electronic circuits or microprocessor chips to change the motor's level, voltage, current, frequency and other methods to control the motor's speed so that the motor can achieve higher performance. For DC motors, the speed control methods are: 1) armature circuit resistance speed control, 2) armature voltage speed control, 3) thyristor converter power supply speed control, 4) DC motor pulse width speed control of high-power semiconductor devices, and 5) excitation current speed control.

[0003] The existing Chinese patent with publication number CN206806195U discloses a dustproof speed regulating switch for electric tools, including a switch body, a button, a movable frame for adjusting the speed of the electric tool, and a swing button for changing the direction of the electric tool. The movable frame and the swing button are movably arranged on the switch body and fixedly connected to the button. It is characterized in that a sealing device is arranged between the button and the switch body, and the sealing device includes a first sealing ring, which is corrugated, and the upper end of which is fixedly arranged on the movable frame and the lower end is fixedly arranged on the switch body.

[0004] In the prior art, in order to combine a DC brushless speed control switch and a steering switch into one switch, it is necessary to add copper parts for connecting the circuit inside the switch, which not only makes the structure more complicated and increases the assembly process, but also requires more copper parts, increasing the production cost.

[0005] Therefore, the inventor believes that it is necessary to provide a DC brushed integrated speed control switch that integrates speed control and steering, which not only has a simple structure but also reduces the use of copper parts, thereby reducing production costs. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a DC brush integrated speed regulating switch.

[0007] According to the utility model, a DC brushed integrated speed regulating switch comprises: a shell, a push rod assembly, a reversing assembly, a PCB board and a circuit board, wherein the push rod assembly, the reversing assembly, the PCB board and the circuit board are all installed inside the shell, the push rod assembly is electrically connected to the circuit board, the PCB board is vertically arranged and electrically connected to the circuit board, the push rod assembly and the reversing assembly are respectively arranged on both sides of the PCB board, a first switch brush and a second protection brush are arranged on a side of the push rod assembly close to the PCB board, a first switch circuit and a second protection circuit corresponding to the first switch brush and the second protection brush are printed on a side of the PCB board close to the push rod assembly, the first switch brush is slidably matched with the first switch circuit, the second protection brush is slidably matched with the second protection circuit, a reversing brush is arranged on a side of the reversing assembly close to the PCB board, a reversing circuit corresponding to the reversing brush is printed on a side of the PCB board close to the push rod assembly, and the reversing brush is rotationally matched with the reversing circuit.

[0008] Preferably, the push rod assembly is movably mounted on the housing, a push rod at one end of the push rod assembly extends to the outside of the housing, a spring is provided at the other end of the push rod assembly, and the push rod assembly can move along the axial direction of the push rod.

[0009] Preferably, a connecting piece is further provided on the push rod assembly, and the connecting piece and the second protective brush are arranged on two adjacent side surfaces of the push rod assembly, and the push rod assembly is electrically connected to the circuit board via the connecting piece.

[0010] Preferably, the reversing assembly is movably mounted on the housing via a connecting column, and the reversing assembly can rotate around the connecting column.

[0011] Preferably, the commutation brush comprises two brush heads, the commutation circuit comprises two commutation contacts corresponding thereto, and the two brush heads do not contact the commutation contacts at the same time.

[0012] Preferably, the commutation circuit comprises: a forward rotation circuit located at the top, a stop position located in the middle, and a reverse rotation circuit located at the bottom.

[0013] Preferably, a circuit connector is provided at the bottom of the PCB board, and the PCB board is connected to circuits on both sides through the circuit connector.

[0014] Preferably, the PCB board is electrically connected to the circuit board via a wire.

[0015] Preferably, a mounting groove corresponding to the shape of the circumference of the PCB board is provided inside the housing, and the PCB board is fixedly mounted in the mounting groove.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model integrates the connection circuit of the push rod assembly and the reversing assembly on the PCB board, and integrates the function of switching the rotation direction of the motor, the function of power on and off, and the function of motor start and stop protection. Only by using one PCB board and the cooperation of the brush and the circuit of the PCB board, the functions of speed regulation and steering can be realized, and no additional copper parts are needed, which effectively reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a DC brush integrated speed regulating switch mainly embodied in the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of a DC brush integrated speed regulating switch mainly embodied in the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of a DC brush integrated speed regulating switch mainly embodied in the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the push rod assembly mainly embodied in the utility model;

[0023] Figure 5 This is a schematic diagram mainly showing the connection between the push rod assembly and the PCB board of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the reversing component mainly embodied in the utility model;

[0025] Figure 7 This is a schematic diagram mainly showing the connection between the reversing component and the PCB board of the present invention.

[0026] Reference numerals:

[0027] Housing 1 Push rod assembly 2 Reversing assembly 3

[0028] PCB board 4 Circuit board 5 First switch brush 21

[0029] Second protective brush 22 Connecting piece 23 Commutation brush 31

[0030] First switch circuit 41 Second protection circuit 42 Switching circuit 43 DETAILED DESCRIPTION

[0031] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0032] like Figure 1-7 As shown, a DC brushed integrated speed regulating switch provided by the utility model comprises: a housing 1, a push rod assembly 2, a reversing assembly 3, a PCB board 4 and a circuit board 5, wherein the push rod assembly 2, the reversing assembly 3, the PCB board 4 and the circuit board 5 are all installed inside the housing 1, the push rod assembly 2 is electrically connected to the circuit board 5, the PCB board 4 and the circuit board 5 are vertically arranged and electrically connected through a wire, the push rod assembly 2 and the reversing assembly 3 are respectively arranged on both sides of the PCB board 4, and a first switch brush 21 and a second protective brush are arranged on one side of the push rod assembly 2 close to the PCB board 4 22, a first switch circuit 41 and a second protection circuit 42 corresponding to the first switch brush 21 and the second protection brush 22 are printed on one side of the PCB board 4 close to the push rod assembly 2, the first switch brush 21 slides with the first switch circuit 41, and the second protection brush 22 slides with the second protection circuit 42. A commutation brush 31 is provided on one side of the commutation assembly 3 close to the PCB board 4, and a commutation circuit 43 corresponding to the commutation brush 31 is printed on one side of the PCB board 4 close to the push rod assembly 2, and the commutation brush 31 rotates with the commutation circuit 43.

[0033] The DC brush integrated speed control switch of the present application can realize switching of the motor rotation direction, power on and off, and operation guarantee action, and is suitable for various handheld power tools. The present application is explained using an electric drill as an example.

[0034] The push rod assembly 2 is movably mounted on the housing 1. The push rod at one end of the push rod assembly 2 extends to the outside of the housing 1. A spring is provided at the other end of the push rod assembly 2. The push rod assembly 2 can move along the axial direction of the push rod. In the initial state, the first switch brush 21 is not in contact with the first switch circuit 41, and the power supply is in a disconnected state. When the push rod is pressed, the first switch brush 21 contacts the first switch circuit 41, and the power supply is in a connected state. When the push rod is continuously pressed or released, the first switch brush 21 slides on the first switch circuit 41 to adjust the output power, thereby realizing stepless adjustment of the rotation speed of the electric drill. At the same time, the second protective brush 22 slides with the second protective circuit 42 to play a role in motor start and stop protection.

[0035] The push rod assembly 2 is also provided with a connecting piece 23 . The connecting piece 23 and the second protective brush 22 are arranged on two adjacent side surfaces of the push rod assembly 2 . The push rod assembly 2 is electrically connected to the circuit board 5 via the connecting piece 23 .

[0036] The commutation assembly 3 is movably mounted on the housing 1 through a connecting column, and the commutation assembly 3 can rotate around the connecting column. The commutation brush 31 includes two brush heads, and the commutation circuit 43 includes two corresponding commutation contacts, and the two brush heads do not contact the commutation contacts at the same time. The commutation circuit 43 includes: a forward rotation circuit located at the top, a stop position located in the middle, and a reverse circuit located at the bottom. In the initial state, the commutation assembly 3 is in a vertical state, the commutation assembly 3 is not in contact with the commutation circuit 43, and the brushed motor stops. Rotate the commutation assembly 3 so that the commutation brush 31 contacts the forward rotation circuit located at the top, and the motor rotates forward, thereby realizing forward rotation of the electric drill. Similarly, rotate the commutation assembly 3 in the reverse direction so that the commutation brush 31 contacts the reverse rotation circuit located at the bottom, and the motor reverses, thereby realizing reverse rotation of the electric drill.

[0037] A circuit connector is provided at the bottom of the PCB board 4, and the PCB board 4 is connected to the circuits on both sides through the circuit connector.

[0038] The housing 1 is provided with a mounting groove corresponding to the shape of the circumference of the PCB board 4, and the PCB board 4 is fixedly mounted in the mounting groove. The specific mounting method of the PCB board 4 can be adjusted according to the actual situation.

[0039] The DC brush integrated speed regulating switch of the present application integrates the connection circuits of the push rod assembly 2 and the reversing assembly 3 on the PCB board 4, and integrates the functions of switching the rotation direction of the motor, the power on and off function, and the motor start and stop protection function. The existing DC brush speed regulating switch usually uses a large number of copper parts to connect with the push rod assembly 2 and the reversing assembly 3 respectively to achieve the functions of speed regulation and steering. The present application only uses a PCB board 4, and the brushes and the circuits of the PCB board 4 cooperate to achieve the functions of speed regulation and steering, without the need to use additional copper parts, which effectively reduces the production cost.

[0040] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A DC brushed integrated speed regulating switch, characterized in that: include: A housing (1), a push rod assembly (2), a reversing assembly (3), a PCB board (4) and a circuit board (5); the push rod assembly (2), the reversing assembly (3), the PCB board (4) and the circuit board (5) are all installed inside the housing (1); the push rod assembly (2) is electrically connected to the circuit board (5); the PCB board (4) and the circuit board (5) are vertically arranged and electrically connected; the push rod assembly (2) and the reversing assembly (3) are respectively arranged on both sides of the PCB board (4); a first switch brush (21) and a second protective brush (22) are arranged on one side of the push rod assembly (2) close to the PCB board (4); and the PCB board (4) is close to the A first switch circuit (41) and a second protection circuit (42) are printed on one side of the push rod assembly (2), which correspond to the first switch brush (21) and the second protection brush (22), respectively; the first switch brush (21) is slidably matched with the first switch circuit (41); the second protection brush (22) is slidably matched with the second protection circuit (42); a commutation brush (31) is arranged on one side of the commutation assembly (3) close to the PCB board (4); a commutation circuit (43) corresponding to the commutation brush (31) is printed on one side of the PCB board (4) close to the push rod assembly (2); the commutation brush (31) is rotatably matched with the commutation circuit (43).

2. The DC brush integrated speed regulating switch according to claim 1, characterized in that: The push rod assembly (2) is movably mounted on the housing (1); a push rod at one end of the push rod assembly (2) extends to the outside of the housing (1); a spring is provided at the other end of the push rod assembly (2); and the push rod assembly (2) is capable of moving along the axial direction of the push rod.

3. The DC brush integrated speed regulating switch according to claim 1, characterized in that: The push rod assembly (2) is also provided with a connecting piece (23), and the connecting piece (23) and the second protective brush (22) are arranged on two adjacent side surfaces of the push rod assembly (2), and the push rod assembly (2) is electrically connected to the circuit board (5) via the connecting piece (23).

4. The DC brush integrated speed regulating switch according to claim 1, characterized in that: The reversing assembly (3) is movably mounted on the housing (1) via a connecting column, and the reversing assembly (3) is capable of rotating around the connecting column.

5. The DC brush integrated speed regulating switch according to claim 4, characterized in that: The commutation brush (31) includes two brush heads, and the commutation circuit (43) includes two commutation contacts corresponding thereto, and the two brush heads do not contact the commutation contacts at the same time.

6. The DC brush integrated speed regulating switch according to claim 5, characterized in that: The commutation circuit (43) comprises: a forward rotation circuit located at the top, a stop position located in the middle, and a reverse rotation circuit located at the bottom.

7. The DC brush integrated speed regulating switch according to claim 1, characterized in that: A circuit connector is provided at the bottom of the PCB board (4), and the PCB board (4) is connected to circuits on both sides via the circuit connector.

8. The DC brush integrated speed regulating switch according to claim 1, characterized in that: The PCB board (4) is electrically connected to the circuit board (5) via a wire.

9. The DC brush integrated speed regulating switch according to claim 1, characterized in that: A mounting groove corresponding to the shape of the circumference of the PCB board (4) is provided inside the housing (1), and the PCB board (4) is fixedly mounted in the mounting groove.

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