CN109473303B

CN109473303B - Switch and electric tool with same

Info

Publication number: CN109473303B
Application number: CN201710802107.1A
Authority: CN
Inventors: 谭和平
Original assignee: Shanghai Baicheng Electric Equipment Manufacture Co Ltd
Current assignee: Shanghai Baicheng Electric Equipment Manufacture Co Ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2024-04-26
Anticipated expiration: 2037-09-07
Also published as: CN109473303A

Abstract

The invention provides a switch and an electric tool with the same. Wherein the switch includes: a housing; the circuit board is arranged in the shell; the TO-220 packaged MOS tubes are connected with the circuit board, each MOS tube comprises three MOS tubes, the two MOS tubes are symmetrically arranged along a plane parallel TO the circuit board, the two MOS tubes are positioned on the same side of the circuit board, each MOS tube is obliquely arranged relative TO the extending direction of the circuit board, and the oblique directions of the MOS tubes are the same. By applying the technical scheme of the invention, the problem of low output power of the switch in the prior art can be effectively solved.

Description

Switch and electric tool with same

Technical Field

The invention relates to the field of tools, in particular to a switch and an electric tool with the same.

Background

Currently, two common brushless switches for electric tools are included in the market, one is a separate switch and the other is an integrated switch. For the disconnect switch, the switch portion is disconnected from the control portion of the motor, and when the switch is mounted on the electric tool, the mounting is troublesome and the mounting efficiency is low. The integrated switch can solve the problem of low installation efficiency, but the volume of the integrated switch cannot be too large due to limited installation space, so that the switch can only adopt a surface-mounted packaged MOS tube with smaller volume, the heat dissipation performance is poor, the output power is low, and the cost is relatively high.

Disclosure of Invention

The invention mainly aims to provide a switch and an electric tool with the same, so as to solve the problem of low output power of the switch in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a switch comprising: a housing; the circuit board is arranged in the shell; the TO-220 packaged MOS tubes are connected with the circuit board, each MOS tube comprises three MOS tubes, the two MOS tubes are symmetrically arranged along a plane parallel TO the circuit board, the two MOS tubes are positioned on the same side of the circuit board, each MOS tube is obliquely arranged relative TO the extending direction of the circuit board, and the oblique directions of the MOS tubes are the same.

Further, an angle alpha between the MOS tube and the extending direction of the circuit board is between 40 degrees and 50 degrees.

Further, an angle α between the extension direction of the MOS transistor and the circuit board is 45 °.

Further, the switch further includes: the heat dissipation device is arranged between the two groups of MOS tubes, and the two groups of MOS tubes are symmetrically arranged on two sides of the heat dissipation device.

Further, an insulating device is arranged between each group of MOS tubes and the heat dissipation device to prevent short circuit.

Further, one of the two sets of MOS pipes far away from the circuit board is a first MOS pipe set, one of the two sets of MOS pipes close to the circuit board is a second MOS pipe set, the MOS pipes comprise an S pole, a D pole and a G pole, and the switch further comprises: the S electrode connecting device is connected with the circuit board, and the S electrode of each MOS tube in the first MOS tube group is connected with the S electrode connecting device; the D pole connecting device is connected with the circuit board and the positive pole of the power supply, and the D pole of each MOS tube in the second MOS tube group is connected with the D pole connecting device; the S-D electrode connecting device is connected with the circuit board and the control part of the driving device, and the D electrode of the MOS tube in the first MOS tube group is connected with the S electrode of the corresponding MOS tube in the second MOS tube group through the S-D electrode connecting device; the G pole connecting device is connected with the circuit board, the G pole of each MOS tube in the first MOS tube group is connected with the circuit board through the G pole connecting device, and the G pole of each MOS tube in the second MOS tube group is directly connected on the circuit board.

Further, the switch further includes: the mounting bracket is provided with a plurality of containing grooves which are obliquely arranged so as to contain the MOS tube.

Further, the circuit board has a contact area thereon, the contact area including a first contact area including an ON area and an OFF area, the switch having an ON state for operating the output device and an OFF state for disabling the output device, the switch further comprising: the movable sliding piece is arranged in a movable way, the moving direction of the movable sliding piece is the same as the extending direction of the first contact area, the movable sliding piece is provided with a first contact point which is in contact with the first contact area, when the movable sliding piece is not subjected to external force, the first contact point is positioned in an OFF area, the switch is in an OFF state, and when the movable sliding piece is subjected to external force, and the first contact point moves into an ON area, the switch is in a communication state.

Further, the contact zone further comprises a second contact zone comprising a speed regulation zone, the switch further comprising: and a second sliding plate which is arranged in a movable manner, wherein the moving direction of the second sliding plate is the same as the extending direction of the second contact area, the second sliding plate is provided with a second contact point which is contacted with the second contact area, and the speed of the output equipment is changed along with the change of the position of the second contact point in the speed regulation area.

Further, the contact region further includes a third contact region including a forward contact region, a reverse contact region, and a neutral contact region between the forward contact region and the reverse contact region, the switch further including: and a third slider movably disposed in the same direction as the extending direction of the third contact area, the third slider having a third contact point in contact with the third contact area, the output device being rotated forward when the third contact point is located in the forward contact area, and the output device being rotated backward when the third contact point is located in the reverse contact area.

Further, the shell includes interconnect's first mounting box and second mounting box, and the circuit board includes linkage segment and contact segment, and the MOS pipe is connected on the linkage segment, and the contact zone is located the contact segment, and the linkage segment is located first mounting box, and the contact segment stretches into to in the second mounting box.

Further, the extending directions of the first contact area and the second contact area are the same and are perpendicular to the extending direction of the circuit board, and the switch further comprises: the push rod is movably arranged in the second mounting box, and the first sliding plate and the second sliding plate are arranged at the end part of the push rod; the elastic reset piece is arranged between the shell and the push rod, when the push rod is pushed, the elastic reset piece is compressed, and when the push rod is not forced, the push rod returns to the initial position under the action of the elastic restoring force of the elastic reset piece.

Further, the push rod comprises a rod body section and a sliding block section, the first sliding piece and the second sliding piece are arranged on the surface, close to the circuit board, of the sliding block section, a guide groove is formed in the second mounting box, and the sliding block section is movably arranged in the guide groove.

Further, the switch further includes: the button is sleeved at the end part of the push rod, which is far away from the first sliding piece and the second sliding piece.

Further, the extending direction of the third contact area is perpendicular to the extending direction of the circuit board, and the switch further includes: the rotating handle is arranged on the side wall of the second mounting box in a pivoting manner, the axis of the pivoting shaft of the rotating handle is the same as the extending direction of the circuit board, and a protruding structure is arranged at the end part of the rotating handle; the sliding block is slidably arranged in the second mounting box, the sliding direction of the sliding block is the same as the extending direction of the third contact area, one side of the sliding block, which is close to the rotating handle, is provided with a chute which is obliquely arranged, at least part of the protruding structure is positioned in the chute, when the rotating handle rotates, the protruding structure can be abutted with the wall of the chute to drive the sliding block to slide, and the third sliding piece is arranged on one side, which is close to the circuit board, of the sliding block.

Further, the second mounting box includes base and lock upper cover on the base, and the circuit board sets up on the base, is provided with a plurality of gear grooves on the upper cover, and the arrangement direction in a plurality of gear grooves is the same with the slip direction of slider, and one side that is close to the upper cover of slider is provided with the accommodation hole, and the switch still includes: a spring accommodated in the accommodation hole; and the limiting ball is positioned at the end part of the spring, and at least part of the limiting ball is exposed out of the sliding block and is matched with one of the gear grooves.

According to another aspect of the present invention, there is provided a power tool including a switch as described above.

By applying the technical scheme of the invention, the switch comprises the MOS tube connected with the circuit board. The MOS tubes are two groups, each group comprises three MOS tubes, the two groups of MOS tubes are symmetrically arranged along a plane parallel to the circuit board, and the two groups of MOS tubes are positioned on the same side of the circuit board. Because each group contains three MOS pipe, two sets of MOS pipe are along the plane symmetry setting that is on a parallel with the circuit board, therefore the length that above-mentioned structure made the shell can shorten greatly to greatly reduced the occupation volume of switch. In addition, by applying the technical scheme of the invention, each MOS tube is obliquely arranged relative to the extending direction of the circuit board, and the oblique directions of the MOS tubes are the same, and the structure can further greatly shorten the length of the shell, so that the occupied volume of the switch is further reduced. The combination of the two arrangements described above allows the space occupied by the switch to be small enough to allow the switch to fit into a limited installation space. It should be noted that, by applying the technical scheme of the invention, the MOS tube is a T-packaged MOS tube, and the volume of the MOS tube is larger than that of the SMD packaged MOS tube, so that the MOS tube has better heat dissipation performance, high output power and low cost, thereby solving the problem of low output power of the switch in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 shows a schematic perspective view of an embodiment of a switch according to the invention;

FIG. 2 shows an enlarged schematic view of the structure at A of FIG. 1;

FIG. 3 shows an exploded view of the switch of FIG. 1;

Fig. 4 is a schematic diagram showing an exploded structure of the MOS transistor assembly, the first mounting case, the second mounting case, and the circuit board of the switch of fig. 1;

FIG. 5 shows a schematic cross-sectional structural view of the switch of FIG. 1;

Fig. 6 is a schematic perspective view of a MOS transistor assembly of the switch of fig. 1;

fig. 7 shows an exploded view of the MOS transistor assembly of the switch of fig. 6;

FIG. 8 shows a schematic perspective view of a circuit board of the switch of FIG. 1;

FIG. 9 shows a schematic top view of the circuit board of FIG. 8;

FIG. 10 shows a schematic view of a partial cross-sectional structure of the switch of FIG. 1 with the first contact in the OFF region;

FIG. 11 shows a schematic view in partial cross-section of the switch of FIG. 1 with the first contact in the ON region and the second contact in the governor region;

FIG. 12 shows a schematic view in partial cross-section of the switch of FIG. 1 with the first contact located within the ON region and the second contact located outside the governor region;

FIG. 13 is a schematic perspective view showing an angle of engagement of the base, button, push rod, slider, and rotary handle of the switch of FIG. 1;

FIG. 14 is a schematic perspective view showing another angle of engagement of the base, button, push rod, slider, and rotary handle of the switch of FIG. 1;

FIG. 15 shows a schematic perspective view of the button and push rod of the switch of FIG. 1 mated;

FIG. 16 shows a schematic top view of the switch of FIG. 1 with the third contact in the positive transition contact area;

FIG. 17 shows a schematic view of a partial cross-sectional structure of the first contact of the switch of FIG. 16 in the positive transition contact area;

Fig. 18 shows a schematic top view of the switch of fig. 1 with the third contact in the neutral contact region;

fig. 19 shows a schematic view of a partial cross-sectional structure of the third contact of the switch of fig. 18 in the neutral contact region;

FIG. 20 shows a schematic top view of the switch of FIG. 1 with the third contact in the reverse contact region;

FIG. 21 shows a schematic view of a partial cross-sectional structure of the third contact of the switch of FIG. 20 in the reverse contact region;

Fig. 22 shows a schematic perspective view of the switch of fig. 20 showing the chute;

FIG. 23 is a schematic perspective view showing one direction of the rotary handle of FIG. 20;

FIG. 24 is a schematic perspective view showing another direction of the rotary handle of FIG. 20; and

Fig. 25 shows an exploded structural view of the rotation handle of fig. 20.

Wherein the above figures include the following reference numerals:

10. A housing; 11. a first mounting box; 12. a second mounting box; 123. a base; 124. an upper cover; 20. a circuit board; 21. a connection section; 22. a contact section; 30. a MOS tube; 40. a heat sink; 41. a horizontal section; 42. a vertical section; 50. an insulation device; 60. a first MOS tube group; 70. a second MOS tube group; 80. a mounting bracket; 81. a receiving groove; 90. a contact region; 91. a first contact region; 911. an ON region; 912. an OFF region; 92. a second contact region; 921. a speed regulation area; 93. a third contact region; 931. a positive-contact region; 932. reversing the contact area; 933. a neutral contact region; 100. a first slider; 101. a first contact; 110. a second slide; 111. a second contact; 120. a third slider; 121. a third contact; 122. a guide groove; 130. a push rod; 131. a rod body section; 132. a slider section; 140. an elastic reset piece; 150. a button; 160. a rotating handle; 161. a bump structure; 170. a slide block; 171. a chute; 172. a receiving hole; 180. a spring; 190. a limit ball; 200. an S pole connecting device; 210. a D pole connecting device; 220. S-D pole connecting device; 230. g pole connecting device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 7, the switch of the present embodiment includes: housing 10, circuit board 20, and TO-220 packaged MOS tube 30. Wherein the circuit board 20 is disposed within the housing 10. The MOS tubes 30 packaged by the TO-220 are connected with the circuit board 20, the MOS tubes 30 are two groups, each group comprises three MOS tubes 30, the two groups of MOS tubes 30 are symmetrically arranged along a plane parallel TO the circuit board 20, the two groups of MOS tubes 30 are positioned on the same side of the circuit board 20, each MOS tube 30 is obliquely arranged relative TO the extending direction of the circuit board 20, and the oblique directions of the MOS tubes 30 are the same.

By applying the technical scheme of the invention, the switch comprises the MOS tube 30 connected with the circuit board 20. The MOS tubes 30 are two groups, each group comprises three MOS tubes 30, the two groups of MOS tubes 30 are symmetrically arranged along a plane parallel to the circuit board 20, and the two groups of MOS tubes 30 are positioned on the same side of the circuit board 20. Because each group contains three MOS pipes 30, two sets of MOS pipes 30 are arranged symmetrically along the plane parallel to the circuit board 20, so the length of the shell 10 can be greatly shortened by the structure, and the occupied volume of the switch is greatly reduced. In addition, by applying the technical scheme of the invention, each MOS tube 30 is obliquely arranged relative to the extending direction of the circuit board 20, and the oblique directions of the MOS tubes 30 are the same, and the structure can further greatly shorten the length of the shell 10, so that the occupied volume of the switch is further reduced. The combination of the two arrangements described above allows the space occupied by the switch to be small enough to allow the switch to fit into a limited installation space. It should be noted that, by applying the technical scheme of the invention, the MOS tube is the MOS tube 30 packaged by TO-220, and the volume of the MOS tube 30 is larger than that of the MOS tube packaged by the patch, so that the MOS tube has better heat dissipation performance, high output power and low cost, thereby solving the problem of low output power of the switch in the prior art.

As shown in fig. 5 and 6, in the present embodiment, the angle α between the MOS tube 30 and the extending direction of the circuit board 20 is between 40 ° and 50 °. The above structure makes the length and width of the housing 10 suitable, and does not greatly increase the width of the housing 10 in order to greatly shorten the length of the housing 10. Preferably, in the present embodiment, the angle α between the MOS tube 30 and the extending direction of the circuit board 20 is 45 °, and the above structure makes the space utilization inside the switch larger. Of course, it should be understood by those skilled in the art that the angle α between the extension direction of the MOS transistor 30 and the circuit board 20 may be less than 40 ° or more than 50 ° according to the actual installation space.

As shown in fig. 4, in the present embodiment, the switch further includes: the heat dissipation device 40 is disposed between the two sets of MOS transistors 30, and the two sets of MOS transistors 30 are symmetrically disposed on two sides of the heat dissipation device 40. The structure can radiate heat of the MOS tube 30, so that the service life of the MOS tube 30 is ensured. Preferably, in the present embodiment, the heat dissipating device 40 is a heat dissipating fin, and the heat dissipating fin includes a horizontal section 41 and a vertical section 42 connected to an edge of the horizontal section 41, and the two sets of MOS transistors 30 are symmetrically disposed on two sides of the horizontal section 41. The horizontal segment 41 can radiate heat from the MOS transistors 30 on both sides at the same time. In addition, the vertical section 42 increases the heat dissipation area, and thus the heat dissipation effect of the heat dissipation device 40 is better.

As shown in fig. 3, in the present embodiment, an insulating device 50 is provided between each set of MOS transistors 30 and the heat sink 40 to prevent short circuit. Preferably, in this embodiment, the insulating means 50 comprises two sheets of insulating glue.

As shown in fig. 3 and 6, in the present embodiment, one of the two sets of MOS transistors 30 far from the circuit board 20 is a first MOS tube set 60, one of the two sets of MOS transistors 30 near to the circuit board 20 is a second MOS tube set 70, the MOS transistors 30 include an S pole, a D pole, and a G pole, and the switch further includes: an S-pole connection 200, a D-pole connection 210, an S-D-pole connection 220, and a G-pole connection 230. The S-pole connection device 200 is connected to the circuit board 20, and the S-pole of each MOS transistor 30 in the first MOS transistor group 60 is connected to the S-pole connection device 200. The D-pole connection device 210 is connected to the circuit board 20 and the positive electrode of the power supply, and the D-pole of each MOS transistor 30 in the second MOS transistor group 70 is connected to the D-pole connection device 210. The S-D pole connecting device 220 is connected to the circuit board 20 and a control portion (e.g., PCB portion of the motor stator) of the driving device, and the D pole of the MOS tube 30 in the first MOS tube group 60 is connected to the S pole of the corresponding MOS tube 30 in the second MOS tube group 70 through the S-D pole connecting device 220. The G-pole connection devices 230 are plural, each G-pole connection device 230 is connected to the circuit board 20, the G-pole of each MOS tube 30 in the first MOS tube group 60 is connected to the circuit board 20 through each corresponding G-pole connection device 230, and the G-pole of each MOS tube 30 in the second MOS tube group 70 is directly connected to the circuit board 20. The structure can realize that each MOS tube 30 can be connected to the circuit board 20, so that each MOS tube 30 can realize corresponding functions. Preferably, in the present embodiment, the S-pole connecting device 200, the D-pole connecting device 210, the S-D-pole connecting device 220 and the G-pole connecting device 230 are all connecting pieces, which is simple in structure, easy to process and low in cost.

One of the two pieces of insulating tape is sandwiched between the first MOS tube group 60 and the horizontal section 41, and the other of the two pieces of insulating tape is sandwiched between the second MOS tube group 70 and the horizontal section 41.

As shown in fig. 3 to 7, in the present embodiment, the switch further includes a mounting bracket 80, and a plurality of receiving grooves 81 are provided on the mounting bracket 80 and are inclined to receive the MOS transistor 30. The above structure enables the first MOS tube group 60 and the second MOS tube group 70 to be integrated into a MOS tube assembly, and when in installation, the MOS tube assembly is integrally connected to the circuit board 20, and the above structure is convenient for assembly, so that the assembly efficiency is improved.

The following briefly describes the installation process of the MOS tube assembly:

Firstly, the MOS tube 30 of the second MOS tube set 70 with the processed pins is obliquely placed in the accommodating groove 81 of the mounting bracket 80 at an angle of 45 degrees, and then the insulating adhesive tape, the heat dissipating device 40, the insulating adhesive tape and the MOS tube 30 of the first MOS tube set 60 are sequentially positioned. The first MOS tube group 60, the insulating tape, the heat sink 40, and the second MOS tube group 70 are then locked to the mounting bracket 80 with locking screws (rubber washers are sleeved on the screws). Due TO the unique design of the MOS tube assembly, the switch structure is more compact, and the TO-220 packaged MOS tube with more economic cost can be used.

As shown in fig. 8 and 9, in the present embodiment, the circuit board 20 has a contact area 90 thereon, the contact area 90 includes a first contact area 91, the first contact area 91 includes an ON area 911 and an OFF area 912, the switch has an ON state in which the output device is operated and an OFF state in which the output device is not operated, and the switch further includes: and a first slider 100 provided movably, the first slider 100 having a first contact 101 in contact with the first contact region 91 in the same direction as the extending direction of the first contact region 91, the first contact 101 being located in the OFF region 912 when the first slider 100 is not subjected to an external force, the switch being in an OFF state, and the switch being in an ON state when the first slider 100 is subjected to an external force and the first contact 101 being moved into the ON region 911. The structure is simple and easy to realize.

As shown in fig. 8 and 9, in the present embodiment, the circuit board 20 has a contact area 90 thereon, the contact area 90 includes a second contact area 92, the second contact area 92 includes a speed adjusting area 921, and the switch further includes: and a second slider 110 provided movably, the second slider 110 having a second contact 111 in contact with the second contact area 92 in the same direction as the extending direction of the second contact area 92, the speed of the output device being varied with the position of the second contact 111 within the speed regulation area 921. Preferably, in the present embodiment, the second contact area 92 is a resistance area of the speed-adjusting carbon film, and the change of the rotation speed is controlled by the change of the resistance. The structure is simple, easy to realize and low in cost.

As shown in fig. 8 and 9, the circuit board 20 has a contact area 90 thereon, the contact area 90 includes a third contact area 93, the third contact area 93 includes a positive contact area 931, a negative contact area 932, and a neutral contact area 933 between the positive contact area 931 and the negative contact area 932, and the switch further includes: and a third slider 120 provided movably, the third slider 120 having a third contact point 121 in contact with the third contact region 93 in the same direction as the extending direction of the third contact region 93, the output device being rotated forward when the third contact point 121 is located at the forward contact region 931, and being rotated backward when the third contact point 121 is located at the reverse contact region 932. The structure is simple, and the forward rotation and the reverse rotation of the output equipment can be realized.

In this embodiment, ON/OFF, speed regulation and commutation control are well integrated ON the circuit board 20 to form a switch ON, speed regulation and commutation integrated system. The structure simplifies and innovates actual production, and reduces the reject ratio of products due to assembly. In addition, the design of outputting ON/OFF and forward and reverse rotation signals by adopting the sliding sheet type structure realizes the relative motion of the hardware stamping parts without connecting a circuit and switching the current direction. Thus, the electric corrosion between the conductive stamping parts is prevented, the service life of the switch is prolonged, and the cost of the switch is reduced.

As shown in fig. 3 and 4, in the present embodiment, the housing 10 includes a first mounting box 11 and a second mounting box 12 connected to each other, the circuit board 20 is mounted in the first mounting box 11, the circuit board 20 includes a connection section 21 and a contact section 22, the mos transistor 30 is connected to the connection section 21, the contact section 90 is located on the contact section 22, and the contact section 22 extends into the second mounting box 12.

As shown in fig. 10 to 15, in the present embodiment, the extending directions of the first contact region 91 and the second contact region 92 are the same and perpendicular to the extending direction of the circuit board 20, and the switch further includes: the push rod 130 and the elastic restoring member 140. Wherein the push rod 130 is movably disposed in the second mounting box 12, and the first slider 100 and the second slider 110 are disposed at ends of the push rod 130. The elastic restoring member 140 is disposed between the housing 10 and the push rod 130, when the push rod 130 receives a pushing force, the elastic restoring member 140 compresses, and when the push rod 130 receives no external force, the push rod 130 returns to the initial position under the action of the elastic restoring force of the elastic restoring member 140. In particular, fig. 10 to 12 show partial sectional views of the first slider 100 and the second slider 110 mated with the circuit board 20 when the push rod 130 is pushed to different positions. As shown in fig. 10, when the push rod 130 is not subjected to an external force, the first contact 101 of the first slider 100 is located in the OFF region 912, and at this time, the switch is in an OFF state. At the same time, the second contact 111 of the second slider 110 has not yet entered the timing area 921. As shown in fig. 11 and 12, when the push rod 130 receives an external force and the first contact 101 slides into the ON region 911 under the force of the external force, the switch is in the connected state. At the same time, the second contact 111 will slide into the timing area 921 under the influence of the external force. As the push rod 130 continues to advance, the second contact 111 will contact a different location of the governor area 921. As the contact position changes, the output speed of the output device will also change. In addition, as the push rod 130 continues to advance, the elastic restoring member 140 will be gradually compressed. When the push rod 130 loses the external force, the push rod 130 returns to the initial position (the position in fig. 10) under the action of the elastic restoring force, and at this time, the first contact 101 returns to the OFF region 912 along with the push rod 130. The structure is simple and easy to realize.

As shown in fig. 13 and 15, in the present embodiment, the push rod 130 includes a rod body section 131 and a slider section 132, the first slider 100 and the second slider 110 are disposed on the surface of the slider section 132 near the circuit board 20, the second mounting case 12 is provided with a guide groove 122 therein, and the slider section 132 is movably guided in the guide groove 122. The above structure makes the groove wall of the guide groove 122 play a guiding role on the sliding block segment 132, so that the push rod 130 can move along a predetermined direction without deviation, thereby ensuring the stability of the switch.

As shown in fig. 10 to 15, in the present embodiment, the switch further includes: a button 150. The button 150 is sleeved on the end of the push rod 130 away from the first slider 100 and the second slider 110. The above structure has two functions, one is to increase the contact area between the finger of the user and the switch, so that the hand feeling is better when pushing the push rod 130. Another is that the above structure makes the appearance of the switch more beautiful.

As shown in fig. 8 and 16 to 25, in the present embodiment, the extending direction of the third contact region 93 is perpendicular to the extending direction of the circuit board 20, and the switch further includes: the handle 160 and the slider 170 are rotated. The rotating handle 160 is pivotally disposed on a side wall of the second mounting box 12, an axis of a pivot shaft of the rotating handle 160 is the same as an extending direction of the circuit board 20, and an end portion of the rotating handle 160 is provided with a protrusion structure 161. The slider 170 is slidably disposed in the second mounting box 12, the sliding direction of the slider 170 is the same as the extending direction of the third contact area 93, a side of the slider 170 near the rotating handle 160 has a chute 171 disposed obliquely, at least a part of the protrusion 161 is located in the chute 171, when the rotating handle 160 rotates, the protrusion 161 can abut against a slot wall of the chute 171 to drive the slider 170 to slide, and the third slider 120 is disposed on a side of the slider 170 near the circuit board. In the structure, the switch and the rotating speed are regulated and controlled through the keys, and the forward rotation or the reverse rotation is regulated and controlled through the rotating handle, so that confusion of users in the use process is avoided, and the use experience of the users is improved. In addition, the rotation handle 160 and the slider 170 are matched to convert the rotation motion into the linear motion, and the structure is simple and easy to process. Of course, it should be understood by those skilled in the art that in other embodiments, the positive contact area 931, the negative contact area 932 and the neutral contact area 933 may also form an arc-shaped area, and the sliding block 170 may not be needed to directly install the third sliding plate 120 on the rotating handle 160.

Specifically, fig. 16, 18 and 20 show schematic top view of the switch when the rotation handle 160 is rotated to different positions. Fig. 17, 19 and 21 show partial cross-sectional views of the third slider 120 mated with the circuit board 20 when the rotation handle 160 is rotated to a different position. As shown in fig. 16 and 17, when the rotation handle 160 is rotated to the position in fig. 16, the protrusion 161 is engaged with the chute 171, and the slider 170 can be pushed to the farthest position, and at this time, the third contact 121 on the third slider 120 will be in contact with the forward rotation contact area 931, so that when the rotation handle 160 is rotated to this gear position, the switch sends a forward rotation signal to the output device to enable the output device to rotate forward. While the rotation handle 160 is rotated from the position of fig. 16 to the position of fig. 18, the projection 161 is engaged with the left groove wall of the chute 171 (the left side is referred to herein as the left side of fig. 18) to pull the slider 170 to slide leftward. When the rotation handle 160 is rotated to the state in fig. 18, the third contact 121 of the third slider 120 connected to the slider 170 is in contact with the neutral contact region 933, at which time no signal is sent to the output device for forward rotation or reverse rotation. While the rotation handle 160 is rotated from the position of fig. 18 to the position of fig. 20, the projection 161 is engaged with the left groove wall of the chute 171 (the left side is referred to herein as the left side of fig. 20) to pull the slider 170 to slide leftward. When the rotation handle 160 is rotated to the state in fig. 20, the third contact 121 of the third slider 120 connected to the slider 170 is brought into contact with the inversion contact region 932, at which time the switch signals the output device to be inverted, and the output device is inverted.

As shown in fig. 22, 24 and 25, in the present embodiment, the second mounting box 12 includes a base 123 and an upper cover 124 fastened to the base 123, the circuit board 20 is disposed on the base 123, a plurality of gear slots are disposed on the upper cover 124, an arrangement direction of the plurality of gear slots is the same as a sliding direction of the slider 170, a receiving hole 172 is disposed on a side of the slider 170 close to the upper cover 124, and the switch further includes: spring 180 and stop ball 190. Wherein the spring 180 is accommodated in the accommodating hole 172. The stop ball 190 is located at an end of the spring 180, and at least a portion of the stop ball 190 is exposed from the slider 170 and mates with one of the plurality of gear slots. Specifically, when the rotation handle 160 is rotated, the slider 170 starts to slide. As the slider 170 slides, the spring 180 and the check ball 190 within the receiving hole 172 will slide therewith, and the check ball 190 will begin to move from one gear slot to another. During the movement of the check ball 190 away from the previous gear slot, the check ball 190 is subjected to a downward force and the spring 180 located below the check ball 190 is compressed. When the limit ball 190 starts to enter the next gear slot, the limit ball 190 is clamped into the next gear slot under the action of the elastic force of the spring. It should be noted that, in the process that the limit ball 190 moves from the previous gear slot to the next gear slot, the user can feel the feel of obvious gear shifting when rotating the rotating handle 160, so that the use experience of the user is better.

In this embodiment, the side wall of the second mounting box 12 is provided with a avoiding hole for avoiding the push rod 130, and a sealing ring is arranged between the wall of the avoiding hole and the push rod 130 to prevent dust from entering.

In this embodiment, the housing 10 includes a first mounting box 11 and a second mounting box 12 that are connected to each other, the circuit board 20 is mounted in the first mounting box 11, the circuit board 20 includes a connection section 21 and a contact section 22, the mos transistor 30 is connected to the connection section 21, the contact section 90 is located on the contact section 22, and the contact section 22 extends into the second mounting box 12. The above structure enables the MOS tube 30 to be separated from the button 150 and the rotating handle 160, when the button 150 or the rotating handle 160 is damaged, the second mounting box 12 is only opened for maintenance, and the MOS tube 30 in the first mounting box 11 is not interfered, so that the maintenance is more convenient.

The application also provides an electric tool which comprises a switch, wherein the switch is the switch. The switch has the advantages of good heat dissipation performance, high output power and low cost, so the electric tool with the switch also has the advantages.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch, comprising:

a housing (10);

A circuit board (20) disposed within the housing (10);

The MOS tubes (30) are packaged by the TO-220 and are connected with the circuit board (20), each MOS tube (30) is in two groups, each group comprises three MOS tubes (30), the two groups of MOS tubes (30) are symmetrically arranged along a plane parallel TO the circuit board (20), the two groups of MOS tubes (30) are positioned on the same side of the circuit board (20), each MOS tube (30) is obliquely arranged relative TO the extending direction of the circuit board (20), and the oblique directions of the MOS tubes (30) are the same;

one of the two sets of MOS tubes (30) far away from the circuit board (20) is a first MOS tube set (60), one of the two sets of MOS tubes (30) near the circuit board (20) is a second MOS tube set (70), the MOS tubes (30) comprise an S pole, a D pole and a G pole, and the switch further comprises:

The S-pole connecting device (200) is connected with the circuit board (20), and the S pole of each MOS tube (30) in the first MOS tube group (60) is connected with the S-pole connecting device (200);

The D-electrode connecting device (210) is connected with the circuit board (20) and the positive electrode of the power supply, and the D electrode of each MOS tube (30) in the second MOS tube group (70) is connected with the D-electrode connecting device (210);

The S-D electrode connecting device (220) is connected with the circuit board (20) and the control part of the driving device, and the D electrode of the MOS tube (30) in the first MOS tube group (60) is connected with the S electrode of the corresponding MOS tube (30) in the second MOS tube group (70) through the S-D electrode connecting device (220);

The G pole connecting device (230) is connected with the circuit board (20), the G pole of each MOS tube (30) in the first MOS tube group (60) is connected with the circuit board (20) through the G pole connecting device (230), and the G pole of each MOS tube (30) in the second MOS tube group (70) is directly connected on the circuit board (20).

2. The switch according to claim 1, characterized in that the angle α between the MOS transistor (30) and the direction of extension of the circuit board (20) is between 40 ° and 50 °.

3. The switch according to claim 1, characterized in that the angle α between the MOS transistor (30) and the direction of extension of the circuit board (20) is 45 °.

4. The switch of claim 1, further comprising:

the heat dissipation device (40) is arranged between the two groups of MOS tubes (30), and the two groups of MOS tubes (30) are symmetrically arranged on two sides of the heat dissipation device (40).

5. The switch according to claim 4, characterized in that an insulating means (50) is provided between each set of MOS transistors (30) and the heat sink (40) to prevent short circuits.

6. The switch of claim 1, further comprising:

The MOS tube comprises a mounting bracket (80), wherein a plurality of containing grooves (81) which are obliquely arranged are formed in the mounting bracket (80) so as to contain the MOS tube (30).

7. The switch of claim 1, wherein the circuit board (20) has a contact area (90) thereon, the contact area (90) including a first contact area (91), the first contact area (91) including an ON area (911) and an OFF area (912), the switch having an ON state for operating an output device and an OFF state for disabling the output device, the switch further comprising:

A first slider (100) movably arranged, wherein the moving direction of the first slider (100) is the same as the extending direction of the first contact area (91), the first slider (100) is provided with a first contact (101) contacted with the first contact area (91), when the first slider (100) is not subjected to external force, the first contact (101) is positioned in the OFF area (912), the switch is in the OFF state, and when the first slider (100) is subjected to external force, and the first contact (101) moves into the ON area (911), the switch is in the ON state.

8. The switch of claim 7, wherein the contact zone (90) further comprises a second contact zone (92), the second contact zone (92) comprising a speed regulation zone (921), the switch further comprising:

-a movably arranged second slide (110), the direction of movement of the second slide (110) being the same as the direction of extension of the second contact zone (92), the second slide (110) having a second contact (111) in contact with the second contact zone (92), the speed of the output device being a function of the position of the second contact (111) within the speed regulating zone (921).

9. The switch of claim 8, wherein the contact region (90) further comprises a third contact region (93), the third contact region (93) comprising a forward contact region (931), a reverse contact region (932), and a neutral contact region (933) between the forward contact region (931) and the reverse contact region (932), the switch further comprising:

A third slider (120) movably provided, the moving direction of the third slider (120) is the same as the extending direction of the third contact area (93), the third slider (120) has a third contact point (121) that contacts the third contact area (93), the output device is rotated forward when the third contact point (121) is located at the forward contact area (931), and the output device is rotated backward when the third contact point (121) is located at the reverse contact area (932).

10. The switch according to claim 9, wherein the housing (10) comprises a first mounting box (11) and a second mounting box (12) connected to each other, the circuit board (20) comprises a connection section (21) and a contact section (22), the MOS transistor (30) is connected to the connection section (21), the contact section (90) is located on the contact section (22), the connection section (21) is located in the first mounting box (11), and the contact section (22) extends into the second mounting box (12).

11. The switch of claim 10, wherein the first contact region (91) and the second contact region (92) extend in the same direction and perpendicular to the direction of extension of the circuit board (20), the switch further comprising:

a push rod (130) movably disposed within the second mounting box (12), the first slider (100) and the second slider (110) being disposed at ends of the push rod (130);

The elastic reset piece (140) is arranged between the shell (10) and the push rod (130), when the push rod (130) is pushed, the elastic reset piece (140) is compressed, and when the push rod (130) is not pushed by external force, the push rod (130) returns to the initial position under the action of the elastic reset piece (140).

12. The switch of claim 11, wherein the push rod (130) includes a rod body section (131) and a slider section (132), the first slider (100) and the second slider (110) are disposed on a surface of the slider section (132) near the circuit board (20), a guide groove (122) is provided in the second mounting case (12), and the slider section (132) is movably disposed in the guide groove (122).

13. The switch of claim 11, further comprising:

And the button (150) is sleeved at the end part of the push rod (130) far away from the first sliding piece (100) and the second sliding piece (110).

14. The switch according to claim 10, characterized in that the extension direction of the third contact area (93) is perpendicular to the extension direction of the circuit board (20), the switch further comprising:

A rotating handle (160) which is pivotably arranged on the side wall of the second mounting box (12), wherein the axis of a pivot shaft of the rotating handle (160) is the same as the extending direction of the circuit board (20), and a protruding structure (161) is arranged at the end part of the rotating handle (160);

The sliding block (170) is slidably arranged in the second mounting box (12), the sliding direction of the sliding block (170) is the same as the extending direction of the third contact area (93), one side of the sliding block (170) close to the rotating handle (160) is provided with a chute (171) which is obliquely arranged, at least part of the protruding structure (161) is positioned in the chute (171), and when the rotating handle (160) rotates, the protruding structure (161) can be abutted with the wall of the chute (171) so as to drive the sliding block (170) to slide, and the third sliding piece (120) is arranged on one side of the sliding block (170) close to the circuit board (20).

15. The switch according to claim 14, wherein the second mounting case (12) includes a base (123) and an upper cover (124) fastened to the base (123), the circuit board (20) is disposed on the base (123), a plurality of gear grooves are disposed on the upper cover (124), an arrangement direction of the plurality of gear grooves is the same as a sliding direction of the slider (170), and a receiving hole (172) is disposed on a side of the slider (170) close to the upper cover (124), the switch further includes:

A spring (180) accommodated in the accommodation hole (172);

and the limiting ball (190) is positioned at the end part of the spring (180), and at least part of the limiting ball (190) is exposed out of the sliding block (170) and is matched with one of the gear grooves.

16. A power tool comprising a switch, wherein the switch is as claimed in any one of claims 1 to 15.