WO2021078251A1

WO2021078251A1 - Electric tool

Info

Publication number: WO2021078251A1
Application number: PCT/CN2020/123248
Authority: WO
Inventors: 倪沐阳; 赵祥
Original assignee: 南京德朔实业有限公司
Priority date: 2019-10-25
Filing date: 2020-10-23
Publication date: 2021-04-29
Also published as: CN112706043A; CN212635318U; CN112706044A

Abstract

An electric tool (100), comprising: a housing (200); a motor (400), supported by the housing and at least comprising a rotor shaft (410) extending along a first axis; a bearing (420), configured to position the rotor shaft and comprising a rear bearing (422) and a front bearing (421) provided at two ends of the motor; a switch (500), configured to control turn-on and turn-off of the motor; an operating member (600), provided for user operation; and a control assembly (700), connected to the switch, the rear bearing being provided between the motor and the control assembly. The electric tool further comprises: a pull rod (170), connected to the switch and the operating member. The housing comprises a main housing (220) and a rear bearing chamber (270) formed in the main housing. The rear bearing chamber is configured to support the rear bearing and comprises: an accommodating cavity (271), the rear bearing being provided in the accommodating cavity; a through hole (272) through which the pull rod passes; and a partition portion (273), provided between the accommodating cavity and the through hole.

Description

electrical tools

This application requires that the application date is October 25, 2019, the application number is 201911023426.8, the application date is March 26, 2020, the application number is 202020406648.X, and the application date is June 30, 2020, and the application number is 202010611490.4 The priority of the Chinese patent application, the entire content of the above application is incorporated into this application by reference.

Technical field

This application relates to the technical field of operating tools, such as an electric tool.

Background technique

The electric tool provides power output operation through the motor. In order to ensure the normal operation of the motor, it is usually necessary to set a heat dissipation airflow to dissipate the motor, but this will cause the debris generated during the working process of the electric tool to easily enter the inside of the electric tool. Sawdust will cause wear and tear and affect the life of the internal components of electric tools, while metal debris is affected by the electrification state and current changes of electronic devices, and it is easy to adsorb on the pins of electronic devices, and accumulate electrical paths between the pins of electronic devices. The stator and rotor of the motor are also prone to blockage by sucked in debris and cause blockage or wear. Therefore, it is necessary to provide a dust-proof structure for the electric tool to optimize the performance of the electric tool, but the provision of an additional dust-proof structure will undoubtedly increase the cost and is not conducive to the size reduction of the electric tool.

Summary of the invention

According to various embodiments of the present application, an electric tool is provided.

An embodiment provides an electric tool, including: a housing; a motor supported by the housing; the motor includes at least a rotor shaft extending along a first axis; a bearing, the bearing is used to position the rotor shaft, and the bearing includes two The front bearing and the rear bearing at the end; the switch is used to control the opening and closing of the motor; the operating part is for the user to operate; the control assembly is connected to the switch, optionally, the rear bearing is arranged between the motor and the control assembly; the power tool is also Including: tie rod, tie rod connection switch and operating parts; the housing includes a main housing and a rear bearing chamber generated inside the main housing, the rear bearing chamber is used to support the rear bearing, the rear bearing chamber includes: a receiving cavity, the rear bearing is set In the containing cavity; the through hole for the pull rod to pass through; the partition part, the partition part is arranged between the containing cavity and the through hole.

Optionally, a through hole is provided between the main housing and the accommodating cavity, so that the pull rod is restricted between the main housing and the motor.

Optionally, the housing includes a motor accommodating part, the motor is arranged in the motor accommodating part; the operating member, the operating member is arranged on one side of the motor accommodating part.

Optionally, the electric tool includes: a drive circuit, including a power cord, the power cord is connected to the motor and a control component; the control component includes: a power unit, the power unit is connected to the power cord; a heat dissipation element, including: a base plate; a plurality of heat dissipation ribs connected to The base plate is formed in the clamping interval between the heat dissipation ribs; the connecting hole is formed on the base plate, the power cord passes through the connecting hole, and part of the power cord is fixed in the clamping interval by the heat dissipation rib.

Optionally, the electric tool includes: an output shaft for driving work accessories, the output shaft extending along a second axis; the control assembly is arranged to extend along a first plane parallel to the first axis and the second axis; In the direction of the first axis, the projection height of the power cord is lower than the projection height of the heat dissipation ribs.

Optionally, the control component includes a first side and a second side that are parallel to the first axis, and the projection of the power cord to the first plane is within an area defined by the straight line where the first side and the second side are located .

Optionally, the housing includes: a motor accommodating part for supporting the motor; a holding part, the control component is arranged in the holding part; the electric tool further includes a signal line, the signal line is connected to the control component and the switch; the first plane will hold Partially separate the first cavity and the second cavity, the first cavity and the second cavity are arranged on both sides of the control assembly, at least part of the power line is arranged in the first cavity, and at least part of the signal line is arranged in the The second cavity.

Optionally, the holding portion is provided with a first air inlet and a second air inlet, the first air inlet communicates with the first cavity, and the second air inlet communicates with the second cavity.

Optionally, the electric tool further includes a detection device for detecting the rotation position of the motor. The detection device includes a first detection element and a second detection element. The end of the rotor shaft is provided with a mounting hole for placing the first detection element. In the radial direction, the projections of the first detection element and the second detection element at least partially overlap, and the projections of the mounting hole and the rear bearing in the radial direction of the first axis at least partially overlap.

Optionally, the housing further includes a bracket for fixing the second detection element, and the projection of the bracket arranged in the axial direction of the first axis at least partially overlaps the projection of the accommodating cavity.

Optionally, the bracket and the main housing are integrally formed, and the distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 4 mm and greater than or equal to 0 mm.

Optionally, the bracket and the main housing are integrally formed, and the distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 3 mm and greater than or equal to 1 mm.

Optionally, the first detection element is a magnet, and the second detection element includes a printed circuit board and a magnetic encoder.

Optionally, the electric tool includes: a cooling fan, which is connected to the rotor shaft; and a dust-proof fan, which is arranged between the rear bearing chamber and the motor.

An embodiment provides an electric tool, including: a housing including a grip; a motor supported by the housing; the motor includes at least a rotor shaft extending along a first axis; a bearing, the bearing is used to position the rotor shaft; and output The shaft can be driven by the motor to rotate around the second axis; the switch is used to control the on and off of the motor; the operating part is for the user to operate; the electric tool also includes: a pull rod, a pull rod connecting switch and an operating part; the housing includes the main housing And the bearing chamber generated inside the main housing, the bearing chamber is used to support the bearing, the bearing chamber includes: a receiving cavity, the bearing is arranged in the receiving cavity; a through hole for the pull rod to pass through; Between cavity and through hole.

Optionally, the electric tool further includes: a control component connected to the switch and controlling the operation of the motor, the control component includes: a power unit, the power unit is connected to the motor; a control unit, the control unit is connected to the switch, the power unit and the control unit are in control The orthographic projection of the plane where the unit is located is set to at least partially overlap; the first connector is set to support the power unit and the control unit, and is electrically connected to the power unit and the control unit.

Optionally, the first connector is a copper pillar.

Optionally, the control component is arranged to extend along a first plane parallel to the first axis and the second axis, and the length of the control component in the first axis direction is greater than or equal to 75 mm and less than or equal to 105 mm.

Optionally, the ratio of the length of the control component in the direction of the first axis to the length of the motor on the first axis is greater than or equal to 2.5 and less than or equal to 4.2.

Optionally, the first plane separates the holding part from the first cavity and the second cavity, and the holding part is provided with a first air inlet and a second air inlet, the first air inlet and the first cavity communicate with each other. The second air inlet is connected with the second air inlet.

Optionally, it includes: a fan, the fan is connected to the rotor shaft; the housing includes a guide portion arranged in the circumferential direction of the fan, and the guide portion is formed at an end of the housing.

Optionally, the electric tool includes: a transmission device that connects the rotor shaft and the output shaft; a gear box that accommodates the transmission device, and the gear box is connected to the housing; the gear box includes an exhaust hole and a filter device arranged in the exhaust hole.

Optionally, the switch is arranged to extend in the direction of the third axis. In the projection onto the first plane, the angle between the third axis and the second axis is greater than or equal to 10 degrees and less than or equal to 20 degrees.

Optionally, the electric tool further includes: a control component, which controls the operation of the motor; a detection device, which is communicatively connected with the control component and detects the operating parameters of the electric tool; a display interface, which is electrically connected to the control component, and the display interface includes a row Distributed multiple display units and speed regulation mechanisms, multiple display units can be sequentially lit to indicate the current gear of the power tool, the control component controls multiple display units to flash or go out to indicate the fault status of the power tool, and speed regulation The mechanism is manipulated to adjust the gear position of the electric tool; the battery pack and the battery pack are respectively electrically connected with the display interface, the motor and the control component.

Optionally, the fault state of the electric tool includes at least a first type of fault state and a second type of fault state, and the control component controls the display interface to flash or extinguish according to the type of the fault state of the electric tool.

Optionally, the first type of fault state includes battery pack voltage undervoltage and battery pack voltage lower than a preset voltage. When the electric tool is in the first type of fault state, the control component controls a plurality of display units to flash at the first frequency at the same time. For a long time.

Optionally, the electric tool further includes a field-effect transistor and a temperature sensor, the temperature sensor is configured to detect the temperature of the field-effect transistor and the battery pack; the second type of fault state includes the temperature of the battery pack is higher than the first preset temperature, the field-effect The current of the transistor is higher than the preset current value, the temperature of the field effect transistor is higher than the second preset temperature, the motor is locked, and the motor is reversed. When the electric tool is in the second type of fault state, the control component The multiple display units are controlled to blink at the second frequency for a second duration at the same time.

Optionally, the speed regulating mechanism is a button. When the display interface is in the off-screen state, the speed regulating mechanism can be operated to wake up the display interface. When the speed regulating mechanism is set to wake up the display interface, it maintains the gear position of the power tool.

Optionally, when the display interface is in the wake-up state, the speed regulating mechanism is pressed and released to switch the gear position of the electric tool, and the display unit is used to indicate the current gear position of the electric tool.

Optionally, when the power tool fails, the switch is configured to automatically open, and the motor is powered off and stops rotating.

Optionally, the display interface is arranged at the back end of the grip.

Description of the drawings

Figure 1 is a three-dimensional structural view of an angle grinder according to an embodiment of the present application;

Figure 2 is an internal structure diagram of the angle grinder in Figure 1;

Figure 3 is a cross-sectional view of the angle grinder in Figure 1;

Figure 4 is a plan view of the angle grinder in Figure 1;

Figure 5 is a bottom view of the angle grinder in Figure 1;

Fig. 6 is a three-dimensional structural view of the first housing of the angle grinder in Fig. 1;

Figure 7 is a structural diagram of the internal part of the angle grinder in Figure 1;

Fig. 8 is an enlarged schematic diagram of part A of the angle grinder in Fig. 7;

Fig. 9 is an internal plan view of the angle grinder of Fig. 1;

Fig. 10 is a three-dimensional structural view of the control assembly of the angle grinder in Fig. 1;

Fig. 11 is a schematic plan view of the control assembly of the angle grinder in Fig. 1;

Figure 12 is a top view of the internal structure of the angle grinder in Figure 1;

Figure 13 is a top sectional view of the angle grinder in Figure 1;

Figure 14 is a top plan view of the angle grinder in Figure 1 without a shield;

Figure 15 is a plan view of the display interface of the angle grinder in Figure 14;

Figure 16 is a schematic cross-sectional view of the angle grinder in Figure 14;

Figure 17 is a cross-sectional view of an embodiment of the electric circular saw;

18 is a schematic side view of the structure of the rear bearing chamber of the electric circular saw in FIG. 17 and the bracket assembly;

Fig. 19 is a schematic diagram of the rear view of the assembly of the rear bearing chamber and the bracket of the electric circular saw in Fig. 17.

Detailed ways

The embodiment of the present application proposes an electric tool. Taking the angle grinder 100 as an example, referring to FIGS. 1 to 3, it includes: a housing 200, a drive circuit 300, a motor 400, a switch 500, and an operating member 600. The motor 400 includes at least an edge The rotor shaft 410 extending along the first axis 101, the motor 400 drives the rotor shaft 410 to rotate around the first axis 101 during operation. The operating element 600 is arranged on the housing 200, the operating element 600 is for the user to operate, the operating element 600 is connected to the switch 500, and the user drives the switch 500 to move by operating the operating element 600. The driving circuit 300 includes a power cord 310, which is connected to the switch 500 and the motor 400. The switch 500 is driven by the operating member 600 to generate a displacement to control the turning on and off of the motor 400. The angle grinder 100 also includes a control assembly 700, which is connected to the drive circuit. 300. The control assembly 700 controls the operation of the angle grinder 100.

3, the angle grinder 100 further includes an output shaft 110, and the output shaft 110 is arranged to extend along the second axis 102 direction. The output shaft 110 is used to support the work accessories and drive the work accessories to rotate around the second axis 102. The work accessories can be one or a combination of grinding discs, drills, saw blades, grinding wheels, polishing wheels, brush heads, and polishing cloths. The work accessories are output The shaft 110 drives the rotation to perform operations such as grinding and polishing the workpiece. The angle grinder also includes a transmission device 120 which connects the rotor shaft 410 and the output shaft 110 and transmits the output torque of the rotor shaft 410 to the output shaft 110 so that the motor 400 drives the output shaft 110 to rotate around the second axis 102. The transmission device 120 includes bevel gears meshing with each other, respectively connecting the rotor shaft 410 and the output shaft 110 so that the rotation axis of the output shaft 110 can be set perpendicular to the rotation axis of the rotor shaft 410.

4, the main housing 220 has a front end 201 and a rear end 202 in the direction of the first axis 101. The housing 200 further includes a holding portion 210 and a power interface 260. The power interface 260 is provided at the rear end 202 of the housing 200. Used to connect the power supply 221. The power supply device 221 may be a pluggable battery pack, or may be a power connector that matches the mains power. The holding part 210 is for the user to hold, and the motor 400, the control assembly 700 and the switch 500 are all arranged in the holding part 210. Referring to FIG. 3, the holding part 210 and the power interface 260 are connected, and both the holding part 210 and the power interface 260 extend in the direction of the first axis 101. The front end 201 of the main housing 220 is connected with a gear box 140, and the gear box 140 is used for accommodating and supporting the transmission device 120 and the output shaft 110. The motor 400 is arranged at the front end 201 of the main housing 220, so that the rotor shaft 410 is connected to the transmission device 120.

5, the gear box 140 includes an exhaust hole 141 and a filter device (not shown) arranged in the exhaust hole 141. The exhaust hole 141 is used to adjust the air pressure inside the gear box 140. The filter device can be felt to prevent The lubricating oil on the transmission device 120 flows out from the exhaust hole 141.

5 and 6, the housing 200 includes a main housing 220, the main housing 220 is in two halves, including a first housing 230 and a second housing 240, a first housing 230 and a second housing 240 Together, a complete main casing 220 is formed, and an accommodating space 250 is formed inside the main casing 220, and the accommodating space 250 includes a motor accommodating portion 251 for accommodating the motor 400. The motor 400 is supported by the housing 200 and is placed in the motor accommodating part 251. Referring to FIG. 3, the angle grinder 100 is further provided with a heat dissipation fan 150, the heat dissipation fan 150 is connected to the rotor shaft 410, and the heat dissipation fan 150 is arranged at a position close to the gear box 140. When the motor 400 is running, the cooling fan 150 is driven to rotate, and the cooling fan 150 generates a heat dissipation airflow to dissipate heat to the motor 400 and the gear box 140. The main housing 220 is provided with an air outlet 222 at its front end 201 and an air inlet 223 at its rear end 202, so that when the angle grinder 100 is running, the cooling fan 150 runs to generate airflow, and the airflow enters the accommodating space 250 from the air inlet 223 , Flows through the control assembly 700, the motor 400 and then flows out from the air outlet 222.

Referring to 3 and FIG. 6, a bearing 420 is further provided in the housing 200, and the bearing 420 is used for positioning the rotor shaft 410. The bearing 420 includes a front bearing 421 and a rear bearing 422 provided at both ends of the motor 400. The rear bearing 422 is arranged between the motor 400 and the control assembly 700, and the front bearing 421 is arranged at the other end of the motor 400. The housing 200 includes a rear bearing chamber 270 generated inside the main housing 220, and the rear bearing chamber 270 is used to support the rear bearing 422.

7 and 8, the angle grinder 100 further includes a pull rod 170 connecting the switch 500 and the operating member 600. The pull rod 170 extends in the accommodating space 250 and can move to at least a first position and a second position. The user pushes the operating member 600 to switch the first position and the second position where the pull rod 170 is located, thereby driving the switch 500 to produce displacement, so as to control the turning on of the motor 400. The housing 200 is provided with an opening on its side surface, the operating member 600 is provided on the outside of the housing, and the pull rod 170 is provided in the accommodating space. Through the opening, the pull rod 170 can be connected to the operating member 600 on the outside of the housing. The switch 500 is arranged between the motor 400 and the control assembly 700, and the operating member 600 is arranged to be connected to the main housing 220, and the operating member 600 is arranged in front of the holding portion 210 and is aligned with the first axis 101 in the radial direction. The motors 400 overlap, and the linkage relationship between the operating member 600 and the switch 500 is realized through the pull rod 170. The pull rod 170 extends on one side inside the accommodating space 250 and partially overlaps the switch 500 and the motor 400 in the radial direction of the first axis 101. The operating member 600 is arranged in front of the grip 210. When the user holds the grip 210, the user can easily touch the operating member 600 to control the operation of the angle grinder 100, thereby realizing the one-handed operation of the user when using the angle grinder 100 , It is convenient for users to use.

Optionally, the rear bearing chamber 270 and the main housing 220 are integrally formed. The rear bearing chamber 270 is used to support the rear bearing 422. The rear bearing chamber 270 includes a support seat 274, a receiving cavity 271, a through hole 272, and a partition 273. . The supporting seat 274 extends from the inner surface of the main housing 220 to the accommodating space 250 and forms a cylindrical accommodating cavity 271. Optionally, the support seat 274 is formed in the first housing 230 and the second housing 240, and extends from the inner surface of the first housing 230 and the second housing 240 to the accommodating space 250, in the first housing After the 230 and the second housing 240 are spliced, the supporting seats 274 on both sides are connected to form a receiving cavity 271. A through hole 272 and a partition 273 are formed on the support seat 274 on one side. The through hole 272 allows the pull rod 170 to pass through, so that the rear bearing chamber 270 limits the pull rod 170 so that the pull rod 170 can be in the first position and the second position. To prevent the shift of the position of the lever 170 from affecting the function of the switch 500.

The partition 273 is made by the process of inclined top molding. When the rear bearing chamber 270 is molded, the through hole 272 is formed with the aid of the inclined top mold, and the mold is drawn out after molding, so that the rear bearing chamber 270 and the main housing 220 It is integrally formed, and the support seat 274 on one side can generate a through hole 272 and a partition 273. The through hole 272 is provided between the main housing 220 and the accommodating cavity 271 so that the pull rod 170 is restricted between the main housing 220 and the motor 400. The size of the through hole 272 in the radial direction of the first axis 101 is appropriate, which can prevent the draw rod 170 from shifting without interfering with the operation of the operating member 600 by the user.

The partition 273 is provided between the receiving cavity 271 and the through hole 272, so that the through hole 272 penetrates the support seat 274 in the axial direction of the first axis 101, and the through hole 272 is partitioned in the radial direction of the first axis 101 The portion 273 is partitioned and does not penetrate the support seat 274 in the radial direction of the first axis 101. During the operation of the angle grinder 100, the grinding of the workpiece by the work attachment will produce pollutants such as wood chips, metal chips and dust. The airflow drives some pollutants into the housing 200 from the air inlet 223, because the air inlet 223 is set in The end of the main housing 220 can effectively reduce the amount of pollutants entering the interior of the housing 200.

Debris that enters the angle grinder 100, such as sawdust, will cause wear and affect the life of internal components, while metal debris is affected by the electrification state and current changes of the electronic device switch 500, and is easily adsorbed on the pins of the electronic device. An electrical path is accumulated between the pins of the motor 400; or attracted by the magnetic field generated by the stator and rotor of the motor 400, it is attached to the stator or the rotor, or attached to the gap between the stator and the rotor. As a result, electronic devices are extremely susceptible to short-circuiting due to the influence of the electrical path formed by metal debris, and the stator and rotor of the motor 400 are also easily blocked by the sucked debris, resulting in blocking or wear. For example, for the angle grinder 100 using the brushless motor 400, it is desirable to seal the motor 400 structure to avoid the influence of metal debris in the space on the motor 400 and the circuit. The partition 273 provided in the support base 274 can effectively prevent pollutants from entering the bearing 420 and the motor 400, and prevent dust from entering the accommodating cavity 271 from the support base 274 and then entering the motor 400.

Optionally, the motor 400 is configured as an inductive brushless motor. In this case, the angle grinder 100 further includes a detection device 180 for detecting the rotation position of the motor 400. The detection device 180 includes a first detection element 181 and a second detection element 182, and the second detection element 182 is mounted on a printed circuit board. The end of the rotor of the motor 400 is provided with a mounting hole 411, the first detecting element 181 is disposed in the mounting hole 411, the second detecting element 182 is disposed in the housing 200, and the second detecting element 182 is opposite to the first detecting element 181 It is provided that the second detection element 182 can sense the rotation position of the first detection element 181, and then detects the rotation speed of the rotor of the motor 400, that is, the rotation speed of the motor 400.

The first detection element 181 is arranged in the mounting hole 411. In the axial direction of the first axis 101, the projections of the first detection element and the second detection element at least partially overlap, and the mounting hole and the rear bearing are in the radial direction of the first axis. The projections in the directions overlap at least partially. The axial length of the rotor can be used to install the first detection element 181 without additional space for installing the first detection element 181, which reduces the axial size of the whole machine, saves installation space, and is beneficial to the optimization of the whole machine structure. The first detecting element 181 can be protected by the hole wall in the mounting hole 411, preventing the first detecting element 181 from being damaged, and reducing the probability of failure of the electric tool. After the first detection element 181 is installed in the mounting hole 411 on the rotor of the motor 400, the first detection element 181 can be partially or completely accommodated in the mounting hole 411, which is beneficial to reduce the size of the electric tool along the rotor axis 410. The projections of the blind hole and the rear bearing 422 in the radial direction of the first axis 101 at least partially overlap. Optionally, the projections of the blind hole and the rear bearing 422 in the radial direction of the first axis 101 completely overlap, so that the projection of the blind hole and the rear bearing 422 in the radial direction of the first axis 101 can be completely overlapped. The size of the motor 400 is shortened in the axial direction of the axis 101.

The housing further includes a bracket for fixing the second detection element, and the projection of the bracket arranged in the axial direction of the first axis at least partially overlaps the projection of the rear bearing. Optionally, the projection of the bracket on the first axis overlaps the projection of the accommodating cavity 271 in this direction, so that the inside of the rear bearing 270 is protected from dust by the bracket and the second detection element mounted on the bracket, and the first detection The element and the second detecting element are arranged oppositely, which can effectively detect the position of the rotor.

The first detection element 181 is a magnet, and the second detection element 182 is a magnetic encoder. The magnetic encoder is arranged on the printed circuit board. The printed circuit board is close to the end face of the rotor of the motor 400 and is arranged opposite to the end face of the rotor, so that The second detection element 182 on the printed circuit board may be opposite to the first detection element 181. The magnet is made of sintering, and the connection between the magnet and the mounting hole 411 on the motor 400 is glued. The magnet is magnetized first and then placed in the mounting hole 411.

In other embodiments, the detection device 180 can select an encoder with a code disc and a reading head. In this case, the first detection element 181 is a code disc, and the second detection element 182 is a reading head. The code disc rotates with the rotor of the motor 400, and the reading head reads the number on the code disc to detect the rotation speed of the motor 400.

Optionally, the mounting hole 411 is a blind hole, and is provided at the rear end 202 of the rotor, and the front end of the rotor is the output end, which is connected to the grinding head in a driving manner, so that the torque of the motor 400 is transmitted to the grinding head. The mounting hole 411 extends from the rear end 202 surface of the rotor along the axial direction of the motor 400. In one embodiment, the cross-section of the magnet in the mounting hole 411 is approximately circular, and the corresponding mounting hole 411 is also a circular hole.

As mentioned above, the second detection element 182 may be a magnetic encoder, and the magnetic encoder is disposed on the printed circuit board. A bracket 280 for supporting the rear end 202 of the rotor may be provided in the housing 200. In the axial direction of the first axis 101, the bracket 280 is provided between the motor 400 and the switch 500, and the rear end 202 of the rotor is supported by the bearing 420. On the bracket 280, the bracket 280 may be a mounting rib integrally formed inside the housing 200, and the printed circuit board is arranged on the bracket 280. Since the printed circuit board is arranged opposite to the rear end 202 of the rotor, the rear bearing chamber 270 supporting the rear bearing 422 is directly used to install the printed circuit board. The rear bearing chamber 270 is integrally formed to form a bracket 280 for easy assembly.

The bracket 280 and the main housing 220 are integrally formed. Through injection molding, since the housing 200 is in two halves, half of the bracket 280 is integrally formed on the two halves 200. When the two halves 200 are synthesized, a complete架280。 Stand 280. The bracket 280 is provided with a card slot 281, the printed circuit board is clamped in the card slot 281, and the card slot 281 is provided on the bracket 280 to clamp the printed circuit board, which makes assembly more convenient and improves assembly efficiency. Optionally, the bracket 280 can also be a separate mounting frame, which is not limited here.

After the printed circuit board is clamped in the card slot 281, the bracket 280 has a protective function for the printed circuit board, which can prevent contaminants from adhering to the printed circuit board and cause adverse effects. Optionally, the distance between the bracket 280 and the rear bearing chamber 270 in the direction of the first axis 101 is less than or equal to 4 mm and greater than or equal to 0 mm, and the projection of the bracket 280 in the axial direction of the first axis 101 and the accommodating cavity 271 are located there. The projections in the directions overlap at least partially. Optionally, the distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 3 mm and greater than or equal to 1 mm. The printed circuit board is supported by the bracket 280, because the bracket 280 and the rear bearing chamber 270 are arranged oppositely and close together, so that the bracket 280 forms an isolation interval between the motor receiving portion 251 and the switch 500 to prevent foreign matter from falling into the motor receiving portion 251 Inside, it affects or damages the motor 400. Therefore, the bracket 280 has the function of encapsulating the rear bearing chamber 270, thereby eliminating the need to provide additional packaging components, reducing cost and assembly steps.

The angle grinder 100 also includes a dust-proof fan 160. The dust-proof fan 160 is arranged between the rear bearing chamber 270 and the motor 400. The dust-proof fan 160 is connected to the rotor shaft 410 and is driven to rotate by the rotor shaft 410 when the motor 400 is running. The size of the dust-proof fan 160 in the radial direction of the first axis 101 is similar to that of the rear bearing 422, so as to prevent pollutants from entering the motor 400 and improve the dust-proof effect of the motor receiving portion 251 of the angle grinder 100.

9 and 10, the control assembly 700 includes a power unit 710 and a control unit 720, the power unit 710 is connected to the motor 400, the control unit 720 is connected to the switch 500, the power unit 710 and the control unit 720 in the radial direction of the first axis 101 The directions are at least partially overlapped, so that the overall size of the control assembly 700 can be reduced. The control assembly 700 is arranged in the grip 210, and the control assembly 700 is arranged to extend along the first plane 104 parallel to the first axis 101 and the second axis 102, and the length of the control assembly 700 in the direction of the first axis 101 L1 is greater than or equal to 75 mm and less than or equal to 105 mm, and the ratio of the length L1 of the control assembly 700 in the direction of the first axis 101 to the length of the stator stack of the motor 400 on the first axis is greater than or equal to 2.5 and less than or equal to 4.2. The size of the control assembly 700 is shortened, and the arrangement of the angle grinder 100 is optimized to ensure the output performance of the angle grinder.

The control assembly 700 also includes a first connector 740 and a second connector 750. The first connector 740 and the second connector 750 are disposed between the power unit 710 and the control unit 720, and electrically connect the power unit 710 and the control unit. 720. Optionally, the first connector 740 is configured as a copper pillar, and the second connector 750 is configured as a pin header. The first connector 740 can transmit a current greater than or equal to 1A, and the header pin is used to transmit current and signals so as to pass The cooperation of the first connector 740 and the second connector 750 realizes the electrical connection and signal transmission between the power unit 710 and the control unit 720. The cross-sectional area of the copper pillar on the first plane is set to be greater than or equal to 0.4 square centimeters and less than or equal to 2 square centimeters, so that the copper pillars can provide a relatively stable supporting effect. The copper pillar serves as a connection support for the power unit 710 and the control unit 720 at the same time, so that the connection between the power unit 710 and the control unit 720 is stable and the electrical transmission is stable, the service life of the control assembly 700 is prolonged, and the cost can be reduced.

10 to 12, the stacked arrangement of the power unit 710 and the control unit 720 will increase the temperature rise during use, which will affect the performance of the power unit 710 and the control unit 720. In this regard, the control assembly 700 further includes a heat dissipation element 730. The heat dissipation element 730 and the power unit 710 are at least partially overlapped in the radial direction of the first axis 101. The heat dissipation element 730 includes a plurality of substrates 734, heat dissipation ribs 731, The clamping section 732 formed between the heat dissipation ribs 731 and the connection hole 733, the heat dissipation rib 731 and the connection hole 733 are formed on the substrate 734, the power cord 310 passes through the heat dissipation element 730 from the connection hole 733, and part of the power cord 310 is dissipated The rib 731 is defined in the clamping section 732. The heat dissipation ribs 731 are protrusions formed on the surface of the heat dissipation element 730, a clamping interval 732 is formed between the plurality of heat dissipation ribs 731, and the heat dissipation ribs 731 are used for clamping the power cord 310 at the same time. The power cord 310 extends from the power unit 710 and passes through the heat dissipation element 730 from the connecting hole 733, and a part of the power cord 310 is fixed by the clamping section 732. By fixing the power cord 310 by the heat dissipation element 730, the wiring can be optimized, and no additional wiring assembly is required for fixing the power cord 310, and at the same time, the power cord 310 can be dissipated.

When the angle grinder 100 is in operation, part of the heat generated by the control element and the power element is transferred to the heat dissipation element 730 through heat conduction. The heat dissipation airflow flows from the end of the main housing 220 to the front end 201 of the main housing 220, and passes through the surface of the heat dissipation element 730 through the convection belt. The heat dissipation rib 731 can increase the effective heat dissipation surface area and improve the heat dissipation effect.

Optionally, in the direction parallel to the first axis 101, the projection height of the power cord 310 is lower than the projection height of the heat dissipation rib 731, that is, in the direction parallel to the first plane 104, the power cord 310 does not exceed the height of the heat dissipation rib 731 . The control assembly 700 includes a first side 701 and a second side 702 parallel to the first axis 101, and the projection of the power cord 310 to the first plane 104 is defined by the straight line where the first side 701 and the second side 702 are located. This makes the whole machine compact and reasonable wiring.

13, the electric tool further includes a signal line 320, the signal line 320 is connected to the control assembly 700 and the switch 500; the first plane 104 separates the holding part 210 into the first cavity 211 and the second cavity 212, the first cavity 211 and the second cavity 212 are arranged on both sides of the control assembly 700, at least part of the power line 310 is arranged in the first cavity 211, and at least part of the signal line 320 is arranged in the second cavity 212 to prevent the signal line 320 and The power cord 310 is twisted or interfered, and the accommodating space 250 is fully utilized.

Optionally, the holding portion 210 is provided with a first air inlet 2231 and a second air inlet 2232. The first air inlet 2231 is provided in the first housing 230, and the second air inlet 2232 is provided in the second housing 240. The air inlet 2231 communicates with the first cavity 211, and the second air inlet 2232 communicates with the second cavity 212. When the angle grinder 100 is used, the airflow enters the first cavity 211 from the first air inlet 2231, and enters the second cavity 212 from the second air inlet 2232, so that the airflow flows into both sides of the control assembly 700 to improve the heat dissipation effect. The casing 200 includes a guide portion 290 arranged in the circumferential direction of the fan, the side of the guide portion 290 includes an air outlet 222, and the guide portion 290 is integrally formed with the main casing 220.

The housing of the electric tool proposed in the present application integrates the multifunctional elements. The guide portion 290, the rear bearing chamber 270, and the bracket 280 are all integrally molded with the main housing, thereby simplifying the manufacturing process, Reduce the connecting parts, reduce the size of the whole machine, thereby reducing the weight, and making the performance of the power tool more stable.

9, the switch 500 is arranged to extend in the direction of the third axis 103. In the projection to the first plane 104, the angle between the third axis 103 and the second axis 102 is greater than or equal to 10 degrees and less than or equal to 20 degrees. The entire switch 500 is arranged obliquely with respect to the second axis 102, so that the length of the angle grinder in the axial direction of the first axis can be shortened, and part of the grip portion 210 can be obliquely arranged, so that the user can hold the angle grinder more stably. 100, to enhance the user's grip.

Optionally, the shell of the angle grinder may also be a cylindrical shell, and the cylindrical shell is provided with a rear bearing chamber for supporting the rear bearing and the limit rod. The rotor shaft is provided with a mounting hole for placing the detection device, which does not cause restriction here.

Optionally, the motor may be a non-inductive motor. At this time, the rear bearing chamber is sealed in the axial direction of the first axis, and dust is placed into the motor accommodating cavity.

Referring to Figure 14, the electric tool provided in this embodiment has a speed regulating mechanism 820 at the rear end of the grip 210, which can provide users with more gripping positions, which is convenient for users to use. Once the electric tool fails, the electric tool The display unit 810 can also prompt the user, improve the user’s satisfaction, manipulate the speed regulating mechanism 820 of the present application, can wake up the display interface 800 when the display interface 800 is in the off-screen state, and can also wake up the display interface 800 when the display interface 800 is in the off-screen state. Adjust the gear position of the power tool at the time of time. Since the display interface 800 and speed regulation mechanism 820 of the power tool are always in electrical connection with the battery pack 900, that is, regardless of whether the output shaft 110 is in working condition, the speed regulation mechanism 820 can be used to adjust the gear. The gear position of the electric tool is also displayed through four display units 810. The display interface 800 is arranged at the back end of the grip 210, the user can more directly obtain the information prompted by the display interface 800, and it is convenient for the user to adjust the speed of the electric tool through the speed adjustment mechanism 820 on the display interface 800, and through The display unit 810 of the display interface 800 displays the current gear information and fault information, and collects the information, improves the efficiency of obtaining information, and is convenient to use. The display interface 800 with the speed adjustment structure 3 is arranged at the rear end of the grip 210, and the user can set the speed adjustment at the rear of the electric tool, which improves the safety of use.

The gears of the electric tool are different, and the rotation speed of the motor 400 is also different. As the gears increase, the rotation speed of the motor 400 gradually increases. When the electric tool is implemented as an angle grinder, the angle grinder further includes a tool chuck for installing a supporting tool accessory, the tool chuck is connected to the output shaft 110, and the workpiece is output through the tool accessory. 15, since the electric tool of this embodiment has four gears, the number of display units 810 in this embodiment is four, and the four display units 810 are arranged side by side in a row and are respectively connected with the speed regulating mechanism 820 Electrically connected, the gears of the power tool are different, and the number of lighted display units 810 is different. Exemplarily, when the electric tool is in the first gear, the first display unit 810 is lit; when the electric tool is in the second gear, the first two display units 810 are lit; when the electric tool is in the third gear , The first three display units 810 are lit; when the electric tool is in the fourth gear, all the four display units 810 are lit. In other embodiments of the present application, the gears of the electric tool are different, and it may also be illuminated by the display unit 810 in different positions.

Optionally, the detection device includes at least a current sensor or a voltage sensor for detecting the current value or voltage value of the motor 400, and the detection device is electrically connected to the battery pack 900 and the control assembly 700. The detection device detects the operating state parameters of the electric tool and transmits them to the control component 700. The control component 700 analyzes the detected state parameter information to obtain the current operating state of the electric tool, for example, including the fault state of the electric tool, and the control component 700 The prompt mode of the display interface 800 is analyzed, and the corresponding flashing or extinguishing of the display unit 810 is controlled, so as to promptly remind the user of the fault state information of the electric tool.

In other embodiments of the present application, the electric tool may also be a multi-function tool, a gun drill or other electric tools. The lighting method of the gear and display unit 810 of the present application can also be in other forms. For example, the gear of the electric tool is different, the position of the lighted display unit 810 is different, and the lighting method of the display unit 810 is the same as that of the electric tool. The gear information corresponds to one to one, that is, when the electric tool is in the first gear, only the first display unit 810 is lit; when the electric tool is in the second gear, only the second display unit 810 is lit; the electric tool When in the third gear, only the third display unit 810 is illuminated; when the power tool is in the fourth gear, only the fourth display unit 810 is illuminated. In other embodiments, the gear of the power tool is The lighting mode of the display unit 810 may also be in other one-to-one correspondence. The gear of the electric tool and the lighting mode of the display unit 810 are specifically set according to actual needs. The working voltage of the electric tool can be 18V, 24V or other voltage values, which can be set according to actual conditions.

In other embodiments of the present application, the gears of the electric tool are not limited to the four in this embodiment, and the number of corresponding display units 810 is also not limited to the four in this embodiment, and can also be other numbers. The number of the display unit 810 is set corresponding to the gear of the electric tool.

The display interface 800 is provided at the rear end of the grip 210, and the display interface 800 can display the gear position of the electric tool, the rotation speed of the motor 400, and fault information. The battery pack 900 is located in the installation cavity and is electrically connected to the motor 400, the speed regulating mechanism 820, the display unit 810, and the display interface 800, respectively. The battery pack 900 in this embodiment is a rechargeable battery pack. When charging the battery pack 900, in order to be able to display the charging status of the battery pack 900, the electric tool of this embodiment is also provided with a charging indicator 830. As shown in FIG. 2, when the battery pack 900 is charged, the charging indicator can be The mark 830 checks the current charging status of the battery pack 900, which is convenient for the user to charge the battery pack 900.

The speed regulating mechanism 820 of this embodiment is a button. Refer to Figures 14 and 15, and includes a first speed regulating mechanism 821 and a second speed regulating mechanism 822. The control assembly 700 includes a Microcontroller Unit (MCU for short). Shown in the figure). The first speed regulating mechanism 821 and the second speed regulating mechanism 822 are respectively arranged on both sides of the display interface 800. The first speed regulating mechanism 821 is used to increase the gear of the electric tool to increase the rotation speed of the output shaft 110, and the second speed regulating mechanism 821 is used to increase the speed of the output shaft 110. The mechanism 822 is used to lower the gear of the electric tool to reduce the rotation speed of the output shaft 110. Optionally, the first speed regulating mechanism 821 and the second speed regulating mechanism 822 can trigger different AD values (that is, the value converted from an analog signal to a digital signal), and then the micro-control unit can determine the value by detecting the different AD values. As the gear of the power tool increases or decreases, the number of lighted display units 810 increases or decreases accordingly, so that the gear of the power tool corresponds to the number of lighted display units 810 one-to-one.

Optionally, the electric tool of this embodiment further includes a field effect transistor (not shown in the figure) located in the mounting cavity, and the detection device further includes a temperature sensor (not shown in the figure), which is configured to detect the field effect transistor The temperature, temperature sensor and field effect transistor are respectively electrically connected to the battery pack 900.

Optionally, when the switch 500 is turned on, the power tool is in the on state. At this time, the power tool is in a standby state or working state, and the battery pack 900 supplies power to the motor 400; when the switch 500 is turned off, the power tool is in the off state. , The electric tool does not work, and the battery pack 900 does not supply power to the motor 400.

The display interface 800, MCU, and speed regulation mechanism 820 of the electric tool of this embodiment are always connected to the battery pack 900, that is, the battery pack 900 always supplies power to the display interface 800, MCU, and speed regulation mechanism 820, regardless of whether the switch 500 is on. The state is still off, the display interface 800 is in the awake state, and the speed regulating mechanism 820 is pressed and released, and the gear of the electric tool changes.

The control component 700 of this embodiment can be implemented as a processing computing device such as a circuit board, an integrated circuit, and a single-chip microcomputer. The control assembly 700 is connected to the battery pack 900, and the aforementioned speed regulating mechanism 820, the display unit 810, the display interface 800, the MCU, the temperature sensor, and the field effect transistor are electrically connected to the control assembly 700, respectively. The control component 700 analyzes the operating conditions of the electric tool, such as a fault state, and analyzes the flashing mode or extinguishing mode of the display interface 800 corresponding to the fault state. The control component 700 controls the display unit 810 of the display interface 800 to flash or extinguish to Remind the user of the current fault status of the power tool, which is convenient for the user to deal with in time, prevents damage to the power tool, and prevents harm to the user or the environment.

The control component 700 obtains the current gear of the electric tool, and controls the number of lights on the display unit 810 of the display interface 800, prompts the user of the current gear of the electric tool, and facilitates the user to obtain and adjust the working information of the electric tool.

The fault status of the electric tool includes at least the first type of fault status and the second type of fault status. The control assembly 700 controls the display unit 810 of the display interface 800 to flash or go out according to the type of the fault status of the power tool. The first type of fault state includes one or more of the battery pack voltage is undervoltage and the voltage of the battery pack 900 is lower than the preset voltage. When the electric tool is in the first type of fault state, the control assembly 700 controls the display unit 810 to display the first The frequency flashes for the first time.

The second type of fault state includes the temperature of the battery pack 900 is higher than the first preset temperature, the current of the field effect transistor is higher than the preset current value, the temperature of the field effect transistor is higher than the second preset temperature, the motor 400 is locked, and the motor One or more of 400 reverse rotations. When the electric tool is in the second type of failure state, the control assembly 700 controls the multiple display units 810 to flash at the second frequency for a second duration at the same time. The fault state also includes a third type of fault state. The third type of fault state includes at least a communication failure of the battery pack 900. When the power tool is in the third type of fault state, the control assembly 700 controls the multiple display units 810 to turn off simultaneously.

For existing electric tools, the gear position of the electric tool is generally zero when starting, that is, the output shaft 110 of the electric tool does not rotate. If the output shaft 110 is to be rotated, the electric tool must be changed by adjusting the speed regulation mechanism 820 at this time. In order to increase the rotation speed of the output shaft 110, the operation complexity is increased. In order to facilitate the use of users and improve user satisfaction, when starting the power tool of this embodiment, ensure that the power tool is in the last stored gear, that is, after the power tool is turned on, the gear of the power tool is the same as the last stored gear. The gears are the same. In actual use, when the user needs to take a break, keeping the power tool in a working state all the time will cause a waste of electric energy, so the power tool needs to be turned off. When the electric tool is turned on again, the electric tool is in the gear that was stored last time, and the user does not need to re-adjust the gear, which is convenient to use and improves the simplicity of operation.

Exemplarily, when the gear of the electric tool stored last time is zero, after the output shaft 110 and the battery pack 900 are connected, the output shaft 110 of the electric tool does not rotate, and the display interface 800 is in the off-screen state. When the speed regulating mechanism 820 is pressed for the first time, the speed regulating mechanism 820 is awakened, and the display interface 800 is lit at the same time. At this time, when the speed regulating mechanism 820 is released, the gear position of the electric tool will not change. If the stored gear of the electric tool is not zero, after the motor 400 and the battery pack 900 are connected, the output shaft 110 of the electric tool rotates, and the electric tool is in the working state, but the display interface 800 is in the off-screen state at this time. At this time, when the speed regulating mechanism 820 is pressed for the first time, the speed regulating mechanism 820 is awakened, and the display interface 800 is lit at the same time. When the speed regulating mechanism 820 is released, the gear position of the electric tool will not change. That is, regardless of whether the gear of the electric tool stored last time is zero, after connecting the motor 400 and the battery pack 900, the speed regulating mechanism 820 is pressed for the first time, the speed regulating mechanism 820 is awakened, and the display interface 800 is clicked. On, when the speed regulating mechanism 820 is released at this time, the gear position of the power tool will not change, that is, the speed of the output shaft 110 matches the gear position of the last stored power tool, which eliminates the need for the user to adjust the gear position and improves the efficiency of use

During the working process of the electric tool, once the display interface 800 is in the off-screen state from the awake state, if you want to put the display interface 800 from the off-screen state to the awake state again, regardless of whether the gear of the electric tool is at zero gear at this time, Only need to press the speed regulating mechanism 820, the speed regulating mechanism 820 is awakened, and the display interface 800 is lit at the same time, and when the speed regulating mechanism 820 is released at this time, the gear position of the electric tool will also not change. After the display interface 800 is in the awake state, the gear position of the electric tool can be adjusted by pressing and releasing the speed regulating mechanism 820, thereby changing the rotation speed of the output shaft 110.

In this embodiment, even if the motor 400 and the battery pack 900 are not connected and the display interface 800 is in the off-screen state, the display interface 800 can be awakened by pressing the speed regulating mechanism 820. After the display interface 800 is in the awake state, the display interface 800 can still be Press and release the speed regulating mechanism 820 to adjust the gear position of the electric tool, that is, the change of the gear position of the electric tool changes with the release of the speed regulating mechanism 820 as a time node.

When the display interface 800 of the electric tool provided in this embodiment is in the awake state, by controlling the release time point of the speed regulating mechanism 820, the user has a certain amount of time to adjust the gear position of the electric tool in time. A speed regulating mechanism 820 can also control the difference in the release time of the two speed regulating mechanisms 820 to prevent the disorder of the electric tool system. When the display interface 800 of this embodiment transitions from the off-screen state to the awake state, press When the speed regulating mechanism 820 is released, the gear position of the power tool remains unchanged. In addition, this embodiment can also display the fault status of the power tool through the flashing or extinguishing of the display unit 810, so that the user is aware of the fault of the power tool in time, so as to correct The power tool is adjusted to prevent damage to the power tool and prolong the service life of the power tool.

Exemplarily, the display unit 810 of this embodiment is an LED indicator, and the colors of the four LED indicators are the same. In other embodiments of the present application, the display unit 810 is not limited to the LED indicator of this embodiment, and can also be other display units 810 that play an indicating role. The color of the light emitted by the display unit 810 can be the same when it is lit. , Can also be different, for example, when the power tool fails, it emits a red light, and when the gear of the power tool is normally displayed, it emits a green light, etc., which are specifically set according to actual needs.

When the power tool fails, the control assembly 700 controls the four display units 810 to flash or go out at the same time to indicate the fault state. The fault state includes the following situations:

The voltage of the battery pack 900 is lower than the preset voltage, and all the multiple display units 810 flash at the first frequency for the first time period;

The temperature of the battery pack 900 is higher than the first preset temperature, and all the plurality of display units 810 flash at the second frequency for a second duration;

When the temperature of the field effect transistor is higher than the second preset temperature, the current of the field effect transistor is higher than the preset current value, the motor 400 is locked or the motor 400 is reversed, all the multiple display units 810 flash at the third frequency for a third period of time ；

The battery pack 900 has a communication failure, and the multiple display units 810 are all turned off.

Optionally, the first frequency in the foregoing embodiment is 1 Hz, the first duration is 20s, the second frequency and the third frequency are both 5 Hz, and the second duration and the third duration are both 20s. In other embodiments of the present application, the first frequency, the second frequency, and the third frequency may also be other frequency values, and the first duration, the second duration, and the third duration may also be other durations, which are specifically set according to actual needs. .

When the voltage of the battery pack 900 is lower than the preset voltage, the temperature of the battery pack 900 is higher than the first preset temperature, or the temperature of the field-effect transistor is higher than the second preset temperature, the switch 500 of the electric tool is configured to be automatically turned off , The motor 400 stops rotating, which can protect the power tool and prevent the power tool from being damaged. The four display units 810 can still flash at the same time at the frequency of the above-mentioned different situations for the corresponding time period. Close the switch 500, if the above fault is resolved, the protection state will be released, and the four display units 810 will no longer continue to flash; if the above fault still exists, the four display units 810 will continue to flash at the same frequency under the above different conditions. The corresponding duration.

When the motor 400 is blocked, the current of the field effect transistor is higher than the preset current value, or the motor 400 reverses, the switch 500 of the power tool is configured to automatically open, and the power tool stops working, which can protect the power tool. To prevent damage to the power tool, the four display units 810 can still flash at the third frequency for a third period of time at the same time. When the switch 500 is turned on, the protection state is released, and the four display units 810 no longer flicker at the same time.

Among them, the communication failure of the battery pack 900 includes the following situations:

If the installed battery pack 900 is not compatible with the electric tool, the battery pack 900 cannot send a signal to the MCU, so that the battery pack 900 cannot be recognized by the MCU, and the four display units 810 are all turned off;

If the battery pack 900 is not securely installed, the battery pack 900 is not in firm contact with other parts, and the battery pack 900 cannot send a signal to the MCU, making the battery pack 900 also unable to be recognized by the MCU. At this time, all four display units 810 Extinguished.

The electric tool provided in this embodiment further includes: the last time the speed-regulating mechanism 820 is released and the time between pressing and releasing the speed-regulating mechanism 820 this time are the first interval time length, and is provided with a first preset time length. Within the first preset time period when the mechanism 820 is pressed and released, if the speed control mechanism 820 is not pressed and released again, the gear will be calculated according to the instruction of the speed control mechanism 820; if the first interval time is less than the first time interval For a preset time period, the gears are accumulated according to the instruction of the speed regulating mechanism 820, and the time interval until the speed regulating mechanism 820 is activated is greater than the first preset time period, and the final calculated gears are stored. Optionally, the first preset duration of this embodiment is 0.3s, that is, when the last time the governing mechanism 820 is released and the time the governing mechanism 820 is pressed and released this time are longer than 0.3s, the gear information is changed, When the time between the last release of the governor mechanism 820 and the current press and release of the governor mechanism 820 is not greater than 0.3s, the gear information of the power tool is accumulated until the first interval between two adjacent intervals is greater than 0.3s , Modify the final gear information of the power tool.

Exemplarily, the electric tool provided in this embodiment further includes: the time after pressing and releasing the speed regulating mechanism 820 is the second interval time, and if the second interval time is greater than the second preset time, the display interface 800 enters the screen off Status; if the second interval duration is not greater than the second preset duration, the display interface 800 maintains the current wake-up state. Optionally, the second preset duration in this embodiment is 10s. When the display interface 800 enters the off-screen state, the power tool is in the standby state at this time, and the motor 400 of the power tool can still rotate normally. At this time, the speed regulating mechanism 820 is pressed, the screen is awakened, and after the speed regulating mechanism 820 is released, The gear of the electric tool remains unchanged, and the rotation speed of the motor 400 remains unchanged.

Exemplarily, the process of the electric tool of this embodiment is as follows:

Turn on the switch 500 and turn on the power tool at the same time. At this time, the gear of the power tool is the previously stored gear, and the display interface 800 is in the off-screen state;

Press the speed regulating mechanism 820, the display interface 800 is awakened, and when the speed regulating mechanism 820 is released, the gear position of the electric tool remains unchanged;

Adjust the speed regulation mechanism 820 to the required gear according to actual needs;

If the speed regulating mechanism 820 is not triggered again within 0.3s, store the current gear information;

After 10s, the display interface 800 changes from the wake-up state to the off-screen state, and the gear position of the electric tool remains unchanged, that is, the speed of the motor 400 does not change;

After using for a period of time, when you need to turn off the power tool, turn off the switch 500, at this time the display interface 800 is still off the screen;

Press the speed regulating mechanism 820, the display interface 800 is awakened, and the display unit 810 displays the current gear position of the electric tool. When the speed regulating mechanism 820 is released, the gear position of the electric tool remains unchanged;

After that, press and release the speed regulating mechanism 820, the gear of the electric tool changes, and the number of lighted display units 810 changes accordingly;

Loosen the speed regulating mechanism 820 and press and release the speed regulating mechanism 820 again within 0.3s, the gear of the electric tool changes, and the number of lighted display units 810 changes accordingly;

If the speed regulating mechanism 820 is not triggered again within 0.3s, the last gear information is stored;

After 10s, the display interface 800 changes from the wake-up state to the screen-off state, the gear position of the electric tool remains unchanged, and the motor 400 does not rotate.

The electric tools proposed in this application are not limited to angle grinders, and are only introduced with angle grinders as an example. The electric tools can also be electric drills, multi-function tools, electric saws and other products. Referring to Figures 17 to 19, the motor 400a of the circular saw 100a has a motor housing 200a and an inner housing. The motor housing 200a is equivalent to the aforementioned housing, and the motor inner housing is equivalent to the aforementioned rear bearing chamber 270a. The chamber 270a is connected in the housing by screws.

The second detection element 182a is disposed on the bracket 280a, and the bracket 280a is installed on the rear bearing chamber 270a by screws. As mentioned above, in this embodiment, the rear bearing chamber 270a is the inner shell of the motor 400a, the rear bearing chamber 270a is approximately cylindrical, and the bracket 280a is fixed to the cylindrical bottom by screws. The bottom of the cylinder is provided with a through hole for the second detection element 182a on the bracket 280a to face the first detection element 181a, so as to realize the detection of the rotation speed of the motor 400a. The rear end of the rotor of the motor 400a extends to the bottom of the cylinder, so that the first detection element 181a at the rear end of the rotor is close to the second detection element 182a. The bracket 280a is a plastic part, and the second detection element 182a is sealed on the bracket 280a by glue.

Claims

An electric tool including:

case;

A motor, supported by the housing, the motor at least including a rotor shaft extending along a first axis;

A bearing, the bearing is used for positioning the rotor shaft, and the bearing includes a front bearing and a rear bearing respectively arranged at both ends of the motor;

A switch for controlling the on and off of the motor;

Operating parts for users to operate;

A control assembly connected to the switch, wherein the rear bearing is arranged between the motor and the control assembly;

Wherein, the electric tool further includes:

A pull rod, which connects the switch and the operating member;

The housing includes a main housing and a rear bearing chamber generated inside the main housing, the rear bearing chamber is used to support the rear bearing, and the rear bearing chamber includes:

An accommodating cavity, the rear bearing is arranged in the accommodating cavity;

A through hole for the pull rod to pass through;

The partition part is arranged between the accommodating cavity and the through hole.
The electric tool according to claim 1, wherein the through hole is provided between the main housing and the accommodating cavity, so that the pull rod is restricted between the main housing and the motor.
The power tool according to claim 2, wherein:

The housing includes a motor accommodating part, and the motor is arranged in the motor accommodating part;

An operating member, the operating member is arranged on one side of the motor accommodating part.
The power tool according to claim 1, wherein:

The electric tool includes:

The drive circuit includes a power cord, and the power cord is connected to the motor;

The control component includes:

A power unit, where the power unit is connected to the power cord;

Heat dissipation components, including:

Substrate

A plurality of heat dissipation ribs connected to the substrate;

A clamping interval formed between the heat dissipation ribs;

A connecting hole is formed on the substrate, the power cord passes through the connecting hole, and a part of the power cord is fixed in the clamping section by the heat dissipation ribs.
The power tool according to claim 4, which comprises:

An output shaft for driving a work accessory, the output shaft extending along the second axis;

The control assembly is arranged to extend along a first plane parallel to the first axis and the second axis;

In the direction parallel to the first axis, the projection height of the power cord is lower than the projection height of the heat dissipation ribs.
The power tool according to claim 5, wherein: the control assembly includes a first side and a second side parallel to the first axis, and the projection of the power cord to the first plane is on the Within the area defined by the projection of the straight line on which the first side edge and the second side edge are located on the first plane.
The power tool according to claim 5, wherein: the housing comprises:

The motor housing part is used to support the motor;

A holding part, the control assembly is arranged in the holding part;

The electric tool further includes a signal line, which connects the control assembly and the switch;

The first plane separates the holding part from a first cavity and a second cavity, and the first cavity and the second cavity are arranged on both sides of the control assembly, at least partially The power line is disposed in the first cavity, and at least part of the signal line is disposed in the second cavity.
The electric tool according to claim 7, wherein: the holding portion is provided with a first air inlet and a second air inlet, the first air inlet is in communication with the first cavity, and the second air inlet Communicate with the second cavity.
The power tool according to claim 1, wherein:

The electric tool further includes a detection device for detecting the rotation position of the motor, the detection device is communicatively connected with the control assembly, the detection device includes a first detection element and a second detection element, the end of the rotor shaft is provided with a In the installation hole where the first detection element is placed, in the axial direction of the first axis, the projections of the first detection element and the second detection element at least partially overlap, and the installation hole and the The projections of the rear bearing in the radial direction of the first axis at least partially overlap.
The power tool according to claim 9, wherein:

The housing further includes a bracket for fixing the second detection element, and the projection of the bracket arranged in the axial direction of the first axis at least partially overlaps the projection of the accommodating cavity.
The power tool according to claim 10, wherein:

The bracket and the main housing are integrally formed, and the distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 4 mm and greater than or equal to 0 mm.
The power tool according to claim 10, wherein: the bracket and the main housing are integrally formed, and the distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 3 mm and greater than or equal to 1mm.
9. The electric tool according to claim 9, wherein the first detection element is a magnet, and the second detection element includes a printed circuit board and a magnetic encoder.
The power tool according to claim 1, which comprises:

A heat dissipation fan, the heat dissipation fan is connected to the rotor shaft;

The dust-proof fan is arranged between the rear bearing chamber and the motor.
An electric tool including:

The housing, including the grip;

A motor, supported by the housing, the motor at least including a rotor shaft extending along a first axis;

A bearing, the bearing is used to position the rotor shaft;

The output shaft can be driven by the motor to rotate around the second axis;

A switch for controlling the on and off of the motor;

Operating parts for users to operate;

Wherein, the electric tool further includes:

A pull rod, which connects the switch and the operating member;

The housing includes a main housing and a bearing chamber generated inside the main housing, the bearing chamber is used to support the bearing, and the bearing chamber includes:

An accommodating cavity, the bearing is arranged in the accommodating cavity;

A through hole for the pull rod to pass through;

The partition part is arranged between the accommodating cavity and the through hole.
The power tool according to claim 15, wherein:

The electric tool further includes a control component, and controls the operation of the motor, and the control component includes:

A power unit, the power unit is connected to the motor;

A control unit, the control unit is connected to the switch, and the orthographic projections of the power unit and the control unit on the plane where the control unit is located are set to at least partially overlap;

The first connector is configured to support the power unit and the control unit, and electrically connect the power unit and the control unit.
The electric tool according to claim 16, wherein: the first connector is a copper post.
The power tool according to claim 17, wherein: the control assembly is arranged to extend along a first plane parallel to the first axis and the second axis, and the control assembly is in the direction of the first axis The length of the upper part is greater than or equal to 75mm and less than or equal to 105mm.
The power tool according to claim 18, wherein the ratio of the length of the control assembly in the first axis direction to the length of the motor in the first axis direction is greater than or equal to 2.5 and less than or equal to 4.2.
The electric tool according to claim 16, wherein: the first plane separates the holding part from the first cavity and the second cavity, and the holding part is provided with a first air inlet and a second air inlet. An air inlet, the first air inlet is in communication with the first cavity, and the second air inlet is in communication with the second air inlet.
The electric tool according to claim 20, further comprising: a fan connected to the rotor shaft;

The casing includes a guide portion, which is arranged around the circumference of the fan, and the guide portion is formed at an end of the casing.
The power tool according to claim 20, which comprises:

A transmission device that connects the rotor shaft and the output shaft;

A gear box accommodating the transmission device, and the gear box is connected to the housing;

The gear box includes an exhaust hole and a filter device arranged in the exhaust hole.
The power tool according to claim 16, wherein: the switch is arranged to extend in the direction of the third axis, and in the projection to the first plane, the angle between the third axis and the second axis is 10 degrees or more and 20 degrees or less.
The power tool according to claim 16, wherein the power tool further comprises:

A control component, which controls the operation of the motor;

A detection device, which is communicatively connected with the control component and detects the operating parameters of the electric tool;

A display interface, the display interface is electrically connected with the control assembly, the display interface includes a plurality of display units and a speed regulating mechanism distributed in a row, and the plurality of display units can be sequentially lit to indicate the electric For the current gear of the tool, the control assembly controls a plurality of the display units to flash or go out to indicate the fault state of the electric tool, and the speed regulation mechanism is manipulated to adjust the gear of the electric tool;

A battery pack, which is electrically connected to the display interface, the motor, and the control assembly, respectively.
The power tool according to claim 24, wherein: the fault status of the power tool includes at least a first type of fault status and a second type of fault status, and the control component controls the display interface according to the type of the fault status of the power tool Flashes or goes out.
The electric tool according to claim 25, wherein: the first type of fault condition includes one or more of the battery pack voltage is undervoltage, and the battery pack voltage is lower than a preset voltage. When in the first type of fault state, the control component controls a plurality of the display units to blink at a first frequency for a first duration at the same time.
The power tool according to claim 25 or 26, wherein: the power tool further comprises a field effect transistor and a temperature sensor, the temperature sensor being configured to detect the temperature of the field effect transistor and the battery pack;

The second type of fault state includes that the temperature of the battery pack is higher than the first preset temperature, the current of the field effect transistor is higher than the preset current value, the temperature of the field effect transistor is higher than the second preset temperature, and the temperature of the field effect transistor is higher than the second preset temperature. One or more of the motor is locked and the motor is reversed. When the electric tool is in the second type of fault state, the control component controls a plurality of the display units to flash at the second frequency for a second duration at the same time .
The power tool according to claim 27, wherein: the fault state further includes a third type of fault state, the third type of fault state includes at least a battery pack communication fault, and the power tool is in the third type of fault In the state, the control component controls a plurality of the display units to be turned off at the same time.
The electric tool according to claim 24, wherein: the speed regulating mechanism is a button, and when the display interface is in the off-screen state, the speed regulating mechanism can be operated to wake up the display interface, the speed regulating mechanism When it is set to wake up the display interface and is released, the gear position of the electric tool is maintained.
The electric tool according to claim 29, wherein: when the display interface is in an awake state, the speed regulating mechanism is pressed and released to switch the gear position of the electric tool, and the display unit is used to indicate State the current gear of the power tool.
The electric tool according to claim 25, wherein: when the electric tool fails, the switch is configured to be automatically turned off, and the motor is de-energized and stops rotating.
The electric tool according to claim 24, wherein: the display interface is provided at the rear end of the grip portion.
The power tool according to claim 15, wherein:

The electric tool further includes a detection device for detecting the rotation position of the motor, the detection device is communicatively connected with the control assembly, the detection device includes a first detection element and a second detection element, the end of the rotor shaft is provided with a In the installation hole where the first detection element is placed, in the axial direction of the first axis, the projections of the first detection element and the second detection element at least partially overlap, and the installation hole and the The projections of the rear bearing in the radial direction of the first axis at least partially overlap.
The power tool according to claim 33, wherein:

The housing further includes a bracket for fixing the second detection element, and the projection of the bracket arranged in the axial direction of the first axis at least partially overlaps the projection of the accommodating cavity.
The power tool according to claim 15, wherein:

The electric tool includes:

The drive circuit includes a power cord, and the power cord is connected to the motor;

The control component includes:

A power unit, where the power unit is connected to the power cord;

Heat dissipation components, including:

Substrate

A plurality of heat dissipation ribs connected to the substrate;

A clamping interval formed between the heat dissipation ribs;

A connection hole is formed on the substrate, the power cord passes through the connection hole, and a part of the power cord is fixed in the clamping interval by the heat dissipation ribs.