Power Tools

Abstract

The present invention provides an electric tool, comprising: a housing; a motor supported by the housing, the motor at least comprising a rotor shaft extending along a first axis; a bearing, the bearing being used to position the rotor shaft, the bearing comprising a rear bearing and a front bearing arranged at both ends of the motor; a switch, being used to control the opening and closing of the motor; an operating member for user operation; a control assembly connected to the switch, wherein the rear bearing is arranged between the motor and the control assembly; the electric tool further comprises: a pull rod, the pull rod connecting the switch and the operating member; the housing comprising a main housing and a rear bearing chamber generated inside the main housing, the rear bearing chamber being used to support the rear bearing, the rear bearing chamber comprising: an accommodating chamber, the rear bearing being arranged in the accommodating chamber; a through hole, the pull rod passing through; a partition, the partition being arranged between the accommodating chamber and the through hole. The electric tool proposed by the present invention has good dustproof effect and compact size.

Description

Technical Field

[0001] The invention relates to an electric tool. Background Art

[0002] Power tools use motors to provide power output. In order to ensure the normal operation of the motor, it is usually necessary to set up a cooling airflow to dissipate the heat from the motor. However, this will cause debris generated during the operation of the power tool to easily enter the inside of the power tool. Wood chips will cause wear and tear and affect the life of the internal components of the power tool. Metal debris is affected by the power-on state of the electronic device and the change of current. It is very easy to adsorb on the pins of the electronic device and accumulate between the pins of the electronic device to form an electrical path. The stator and rotor of the motor are also easily blocked by the inhaled debris, causing stalling or wear. Therefore, it is necessary to set up a dustproof structure for the power tool to optimize the performance of the power tool, but setting up an additional dustproof structure will undoubtedly increase the cost and is not conducive to reducing the size of the power tool. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the main purpose of the present invention is to provide an electric tool with good dustproof effect and compact size.

[0004] In order to solve the above main invention objectives, there is provided an electric tool, comprising: a housing; a motor, supported by the housing, the motor comprising at least a rotor shaft extending along a first axis; a bearing, the bearing being used to position the rotor shaft, the bearing comprising a rear bearing and a front bearing arranged at both ends of the motor; a switch, being used to control the on and off of the motor; an operating member for user operation; a control assembly, connected to the switch, wherein the rear bearing is arranged between the motor and the control assembly; the electric tool also comprises: a pull rod, the pull rod connecting the switch and the operating member; the housing comprising a main housing and a rear bearing chamber generated inside the main housing, the rear bearing chamber being used to support the rear bearing, the rear bearing chamber comprising: an accommodating chamber, the rear bearing being arranged in the accommodating chamber; a through hole, for the pull rod to pass through; a partition portion, the partition portion being arranged between the accommodating chamber and the through hole.

[0005] Optionally, the electric tool further comprises a detection device for detecting the rotational position of the motor, the detection device comprises a first detection element and a second detection element, and a mounting hole for placing the first detection element is provided at the end of the rotor shaft.

[0006] Optionally, projections of the mounting hole and the rear bearing in the radial direction of the first axis at least partially overlap.

[0007] Optionally, the housing further comprises a bracket for fixing the second detection element, and a projection of the bracket arranged in the axial direction of the first axis at least partially overlaps with a projection of the accommodating cavity.

[0008] Optionally, the bracket and the main shell are integrally formed, and the shortest projection distance between the bracket and the rear bearing chamber in the direction of the first axis is less than or equal to 3 cm and greater than or equal to 0 cm.

[0009] Optionally, the first detection element is a magnet, and the second detection element includes a printed circuit board and a magnetic encoder.

[0010] Optionally, a through hole is provided between the main housing and the accommodating cavity, so that the pull rod is confined between the main housing and the motor.

[0011] Optionally, a cooling fan is connected to the rotor shaft; and a dustproof fan is arranged between the rear bearing chamber and the motor.

[0012] Optionally, the shell includes a motor accommodating portion, and the motor is arranged in the motor accommodating portion; the angle grinder also includes an operating member, and the operating member is arranged on one side of the motor accommodating portion.

[0013] Optionally, the electric tool also includes a battery pack and a display interface, the battery pack is detachably connected to the housing, and the display interface is used to control the rotation speed of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural diagram of an angle grinder according to an embodiment of the present invention;

[0015] Figure 2 yes Figure 1 The internal structure diagram of the angle grinder in;

[0016] Figure 3 yes Figure 1 A cross-sectional view of the angle grinder in FIG.

[0017] Figure 4 yes Figure 1 The plan view of the angle grinder in;

[0018] Figure 5 yes Figure 1 Bottom view of the angle grinder in;

[0019] Figure 6 yes Figure 1 A three-dimensional structural diagram of the first housing of the angle grinder;

[0020] Figure 7 yes Figure 1 The internal structure diagram of the angle grinder;

[0021] Figure 8 yes Figure 7 An enlarged schematic diagram of part A of the angle grinder;

[0022] Fig. 9 yes Figure 1 Schematic diagram of the internal plan of the angle grinder;

[0023] Fig.10 yes Figure 1 A three-dimensional structural diagram of the control components of the angle grinder;

[0024] Fig.11 yes Figure 1 A schematic plan view of the control components of the angle grinder;

[0025] Fig.12 yes Figure 1 A top view of the internal structure of the angle grinder;

[0026] Fig.13 yes Figure 1 A top view of the angle grinder in FIG.

[0027] Fig.14 yes Figure 1 A top plan view of the angle grinder without a guard;

[0028] Fig.15 yes Fig.14 A plan view of the display interface of the angle grinder;

[0029] Fig.16 is a cross-sectional view of an electric circular saw according to an embodiment;

[0030] Fig.17 yes Fig.16 A schematic diagram of the side view of the rear bearing chamber and bracket assembly of the electric circular saw;

[0031] Fig.18 yes Fig.16 Schematic diagram of the rear view of the rear bearing chamber and bracket assembly of the electric circular saw. DETAILED DESCRIPTION

[0032] The present invention provides an electric tool, taking an angle grinder 100 as an example, referring to Figures 1 to 3 , which includes: a housing 200, a drive circuit 300, a motor 400, a switch 500 and an operating member 600, wherein the motor 400 at least includes a rotor shaft 410 extending along a first axis 101, and the motor 400 drives the rotor shaft 410 to rotate around the first axis 101 when in operation. The operating member 600 is disposed on the housing 200, and the operating member 600 is for a user to operate, and the operating member 600 is connected to the switch 500, and the user drives the switch 500 to move by operating the operating member 600. The drive circuit 300 includes a power line 310, and the power line 310 connects the switch 500 and the motor 400, and the switch 500 is driven by the operating member 600 to generate a displacement to control the opening and closing of the motor 400, and the angle grinder 100 also includes a control component 700, and the control component 700 is connected to the drive circuit 300, and the control component 700 controls the operation of the angle grinder 100.

[0033] Reference Figure 3The angle grinder 100 further includes an output shaft 110, which is arranged to extend along the second axis 102. The output shaft 110 is used to support a working accessory and drive the working accessory to rotate around the second axis 102. The working accessory may be a grinding disc, a drill bit, a saw blade, a grinding wheel, a polishing wheel, a brush head, a polishing cloth, or a combination thereof. The working accessory is driven to rotate by the output shaft 110 to grind and polish the workpiece. The angle grinder further 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 mutually meshing bevel gears, which are respectively connected to the rotor shaft 410 and the output shaft 110, so that the rotation axis of the output shaft 110 can be arranged perpendicularly to the rotation axis of the rotor shaft 410.

[0034] Reference Figure 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 also includes a grip 210 and a power interface 260. The power interface 260 is disposed at the rear end 202 of the housing 200 and is used to connect a power supply device 221. The power supply device 221 can be a pluggable battery pack or a power connector that matches a mains power supply. The grip 210 is for a user to hold. The motor 400, the control assembly 700, and the switch 500 are all disposed in the grip 210. Figure 3 The grip portion 210 is connected to the power interface 260, and both the grip portion 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 to a gear box 140, which is used to accommodate and support the transmission device 120 and the output shaft 110. The motor 400 is disposed at the front end 201 of the main housing 220, so that the rotor shaft 410 is connected to the transmission device 120.

[0035] Reference Figure 5 The gear box 140 includes an exhaust hole 141 and a filter device (not shown) disposed in the exhaust hole 141 . The exhaust hole 141 is used to adjust the air pressure inside the gear box 140 . The filter device may be felt to prevent the lubricating oil on the transmission device 120 from flowing out of the exhaust hole 141 .

[0036] Reference Figure 5 and Figure 6The housing 200 includes a main housing 220. The main housing 220 is a left-right half type, including a first housing 230 and a second housing 240. The first housing 230 and the second housing 240 together form a complete main housing 220, and form a housing space 250 inside the main housing 220. The housing space 250 includes a motor housing portion 251 for housing the motor 400. The motor 400 is supported by the housing 200 and is placed in the motor housing portion 251. Figure 3 The angle grinder 100 is also provided with a cooling fan 150, which is connected to the rotor shaft 410 and is arranged near 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 cooling airflow to dissipate heat from 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 generates an airflow, and the airflow enters the accommodating space 250 from the air inlet 223, flows through the control component 700 and the motor 400, and then flows out from the air outlet 222.

[0037] Refer to 3 and Figure 6 The housing 200 is also provided with a bearing 420, which is used to position the rotor shaft 410, and includes a front bearing 421 and a rear bearing 422 disposed at both ends of the motor 400. The rear bearing 422 is disposed between the motor 400 and the control assembly 700, and the front bearing 421 is disposed at the other end of the motor 400. The housing 200 includes a rear bearing chamber 270 formed inside the main housing 220, and the rear bearing chamber 270 is used to support the rear bearing 422.

[0038] Reference Figure 7 and Figure 8The 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 accommodation space 250 and can be moved to at least a first position and a second position. The user pushes the operating member 600 to switch the pull rod 170 between the first position and the second position, thereby driving the switch 500 to move to control the opening of the motor 400. The housing 200 is provided with an opening on its side, the operating member 600 is arranged outside the housing, and the pull rod 170 is arranged in the accommodation space. The pull rod 170 can be connected to the operating member 600 outside the housing through the opening. 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 grip 210, overlapping with the motor 400 in the radial direction of the first axis 101, 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 at one side inside the accommodating space 250, and partially overlaps with 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 operating member 600 can be easily touched to control the operation of the angle grinder 100, thereby realizing one-handed operation of the user when using the angle grinder 100, which is convenient for the user.

[0039] Optionally, the rear bearing chamber 270 is designed to be integrally formed with the main housing 220, and 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 support seat 274 extends from the inner surface of the main housing 220 to the receiving space 250, and forms a cylindrical receiving cavity 271. Optionally, the support seat 274 is formed on the first housing 230 and the second housing 240, respectively, and extends from the inner surfaces of the first housing 230 and the second housing 240 to the receiving space 250. After the first housing 230 and the second housing 240 are spliced, the support seats 274 on both sides are connected to form the receiving cavity 271. A through hole 272 and a partition portion 273 are formed on a support seat 274 on one side. The through hole 272 is for 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 move between the first position and the second position, preventing the pull rod 170 from being offset and affecting the function of the switch 500.

[0040] The partition 273 is made by a process of inclined top molding. When molding the rear bearing chamber 270, the mold with inclined top is used to assist in forming the through hole 272, and the mold is pulled out after molding, so that the rear bearing chamber 270 and the main housing 220 are integrally formed, and the support seat 274 on one side can generate the through hole 272 and the partition 273. The through hole 272 is arranged 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 through hole 272 has a suitable size in the radial direction of the first axis 101, which can prevent the pull rod 170 from being offset without interfering with the user's operation of the operating member 600.

[0041] The partition part 273 is arranged between the accommodating cavity 271 and the through hole 272, so that the through hole 272 passes through the support seat 274 in the axial direction of the first axis 101, and the through hole 272 is partitioned by the partition part 273 in the radial direction of the first axis 101, and does not pass through 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 working attachment will generate pollutants such as wood chips, metal chips and dust, and the airflow drives some of the pollutants into the interior of the housing 200 from the air inlet 223. Because the air inlet 223 is arranged at the end of the main housing 220, the amount of pollutants entering the interior of the housing 200 can be effectively reduced.

[0042] Debris, such as wood chips, that enter the angle grinder 100 will cause wear and affect the life of the internal components. Metal debris is easily adsorbed on the pins of the electronic device due to the power-on state of the electronic device switch 500 and the change of current, and accumulates between the pins of the electronic device to form an electrical path; or is attracted by the magnetic field generated by the stator and rotor of the motor 400, and adheres to the stator or rotor, or to the gap between the stator and the rotor. As a result, the electronic device is easily affected by the electrical path formed by the metal debris and short-circuits, and the stator and rotor of the motor 400 are also easily blocked by the inhaled debris and blocked or wear occurs. In particular, the angle grinder 100 using the brushless motor 400 hopes 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 set on the support seat 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 seat 274, and then entering the motor 400.

[0043] Optionally, the motor 400 is configured as a brushless sensor motor, in which case the angle grinder 100 further includes a detection device 180 for detecting the rotational 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. A mounting hole 411 is provided at the end of the rotor of the motor 400, the first detection element 181 is disposed in the mounting hole 411, the second detection element 182 is disposed in the housing 200, and the second detection element 182 is disposed opposite to the first detection element 181, and the second detection element 182 can sense the rotational position of the first detection element 181, and further detect the rotational speed of the rotor of the motor 400, that is, the rotational speed of the motor 400.

[0044] 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 projections of the mounting hole and the rear bearing in the radial direction of the first axis at least partially overlap. The first detection element 181 can be installed by utilizing the axial length of the rotor, and there is no need to increase the space for installing the first detection element 181, thereby reducing the axial size of the whole machine, saving installation space, and facilitating the optimization of the structure of the whole machine. The first detection element 181 can also be protected by the hole wall in the mounting hole 411 to prevent the first detection element 181 from being damaged, thereby 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 even completely accommodated in the mounting hole 411, which is conducive to reducing 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, and optionally, the projections of the blind hole and the rear bearing 422 in the radial direction of the first axis 101 completely overlap, thereby shortening the size of the motor 400 in the axial direction of the first axis 101.

[0045] The housing further includes a bracket for fixing the second detection element, and the bracket is arranged so that the projection in the axial direction of the first axis overlaps at least partially with the projection of the rear bearing. Optionally, the projection of the bracket in the direction of the first axis overlaps with the projection of the accommodating cavity 271 in this direction, so that the rear bearing 270 is dustproofed by the bracket and the second detection element mounted on the bracket, and the first detection element and the second detection element are arranged relative to each other, so that the position of the rotor can be effectively detected.

[0046] The first detection element 181 is a magnet, and the second detection element 182 is a magnetic encoder, which is arranged on a printed circuit board. The printed circuit board is placed close to the end face of the rotor of the motor 400 and arranged opposite to the end face of the rotor, so that the second detection element 182 on the printed circuit board is opposite to the first detection element 181. The magnet is made of sintering, and the connection method between the magnet and the mounting hole 411 on the motor 400 is gluing. The magnet is first magnetized and then placed in the mounting hole 411.

[0047] In other embodiments, the detection device 180 may be an encoder with a code disk and a reading head, in which case the first detection element 181 is a code disk and the second detection element 182 is a reading head. The code disk rotates with the rotor of the motor 400, and the reading head reads the numbers on the code disk to detect the speed of the motor 400.

[0048] Optionally, the mounting hole 411 is a blind hole and is disposed at the rear end 202 of the rotor, and the front end of the rotor is the output end, which is transmission-connected to the grinding head so that the torque of the motor 400 is transmitted to the grinding head. The mounting hole 411 extends from the rear end 202 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.

[0049] As mentioned above, the second detection element 182 may be a magnetic encoder, which is arranged on a printed circuit board. A bracket 280 for supporting the rear end 202 of the rotor may be arranged in the housing 200. In the axial direction of the first axis 101, the bracket 280 is arranged between the motor 400 and the switch 500. The rear end 202 of the rotor is supported on the bracket 280 through the bearing 420. 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 integrally forms the bracket 280, which can be easily assembled.

[0050] The bracket 280 is integrally formed with the main housing 220 by injection molding. Since the housing 200 is in two halves, one half of the bracket 280 is integrally formed on each of the two halves of the housing 200. When the two halves of the housing 200 are combined, a complete bracket 280 is formed. The bracket 280 is provided with a slot 281, and the printed circuit board is clamped in the slot 281. The slot 281 is provided on the bracket 280 to clamp the printed circuit board, making assembly more convenient and improving assembly efficiency. Optionally, the bracket 280 can also be a separate mounting frame, which is not limited here.

[0051] When the printed circuit board is clamped in the clamping slot 281, the bracket 280 has a protective function for the printed circuit board, which can prevent pollutants from adhering to the printed circuit board and causing adverse effects. Optionally, the shortest projection 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 overlaps at least partially with the projection of the accommodating chamber 271. Optionally, the shortest projection 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 relatively arranged and the distance is relatively close, so that the bracket 280 forms an isolation zone between the motor accommodating portion 251 and the switch 500 to prevent foreign matter from falling into the motor accommodating portion 251 and affecting or damaging the motor 400. Therefore, the bracket 280 has the function of encapsulating the rear bearing chamber 270, so that there is no need to set up an additional encapsulation component, reduce costs, and reduce assembly steps.

[0052] The angle grinder 100 also includes a dustproof fan 160, which is arranged between the rear bearing chamber 270 and the motor 400. The dustproof 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 radial dimension of the dustproof fan 160 in the first axis 101 is similar to the rear bearing 422, thereby further preventing pollutants from entering the interior of the motor 400 and improving the dustproof effect of the motor accommodating portion 251 of the angle grinder 100.

[0053] Reference Fig. 9 and Fig.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, and the control unit 720 is connected to the switch 500. The power unit 710 and the control unit 720 are at least partially overlapped in the radial direction of the first axis 101, so that the overall size of the control assembly 700 can be reduced. The control assembly 700 is arranged in the grip portion 210, and the control assembly 700 is arranged to extend along a first plane 104 parallel to the first axis 101 and the second axis 102, and the length L1 of the control assembly 700 in the direction of the first axis 101 is greater than or equal to 75 mm and less than or equal to 105 mm, so that 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 length of the motor 400 in the first direction 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 overall arrangement of the angle grinder 100 is optimized to ensure the output performance of the angle grinder.

[0054] The control assembly 700 also includes a first connector 740 and a second connector 750, which are arranged 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 set as a copper column, and the second connector 750 is set as a pin row. The first connector 740 can transmit a current greater than or equal to 1A, and the pin row is used to transmit current and signals, so that the electrical connection and signal transmission between the power unit 710 and the control unit 720 are realized through the cooperation of the first connector 740 and the second connector 750. The cross-sectional area of ​​the copper column 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 column can provide a relatively stable support. The copper column also serves as a connecting support member of the power unit 710 and the control unit 720, 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 extended, and the cost can be reduced.

[0055] Reference Figure 10 to Figure 12 The stacking arrangement of the power unit 710 and the control unit 720 will increase the temperature rise generated during use, thereby affecting 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, a clamping section 732 formed between the heat dissipation ribs 731, and a connection hole 733, the heat dissipation ribs 731 and the connection hole 733 are formed on the substrate 734, the power line 310 passes through the heat dissipation element 730 from the connection hole 733, and part of the power line 310 is defined in the clamping section 732 by the heat dissipation ribs 731. The heat dissipation ribs 731 are protrusions formed on the surface of the heat dissipation element 730, and the clamping section 732 is formed between the plurality of heat dissipation ribs 731, and the heat dissipation ribs 731 are also used to clamp the power line 310. The power line 310 extends from the power unit 710 and passes through the heat dissipation element 730 from the connection hole 733, and a portion of the power line 310 is fixed by the clamping section 732. By fixing the power line 310 by the heat dissipation element 730, the wiring can be optimized, and no additional wiring assembly is required to fix the power line 310, and the power line 310 can also be cooled.

[0056] When the angle grinder 100 is in operation, part of the heat generated by the control elements and the power elements is transferred to the heat dissipation element 730 through heat conduction. The heat dissipation airflow flows from the end of the main shell 220 to the front end 201 of the main shell 220, and takes away the heat through the surface of the heat dissipation element 730 by convection. The heat dissipation ribs 731 can increase the effective heat dissipation surface area and improve the heat dissipation effect.

[0057] Optionally, in a direction parallel to the first axis 101, the projected height of the power cord 310 is lower than the projected height of the heat dissipation rib 731, that is, in a direction parallel to the first plane 104, the power cord 310 does not exceed the height of the heat dissipation rib 731. The control component 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 within the area defined by the straight line where the first side 701 and the second side 702 are located, so that the whole machine is compact and the wiring is reasonable.

[0058] Reference Fig.13 The electric tool also includes a signal line 320, which connects the control component 700 and the switch 500; the first plane 104 separates the gripping portion 210 into a first cavity 211 and a second cavity 212, and the first cavity 211 and the second cavity 212 are arranged on both sides of the control component 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, so as to prevent the signal line 320 and the power line 310 from being entangled or interfering with each other and make full use of the accommodating space 250.

[0059] Optionally, the grip portion 210 is provided with a first air inlet 2231 and a second air inlet 2232, the first air inlet 2231 is provided on the first housing 230, the second air inlet 2232 is provided on the second housing 240, the first air inlet 2231 is connected to the first cavity 211, and the second air inlet 2232 is connected to 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 component 700 respectively, improving the heat dissipation effect. The housing 200 includes a guide portion 290 provided on the circumference of the fan, and the side of the guide portion 290 includes an air outlet 222, and the guide portion 290 is integrally formed with the main housing 220.

[0060] The shell of the electric tool proposed in the present invention integrates multifunctional components into one body, and the guide part 290, the rear bearing chamber 270, and the bracket 280 are molded integrally with the main shell, thereby simplifying the manufacturing process, reducing connecting parts, reducing the size of the whole machine, thereby reducing weight, and making the performance of the electric tool more stable.

[0061] Reference Fig. 9The switch 500 is arranged to extend in the direction of the third axis 103. In the projection onto 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 switch 500 is arranged obliquely relative to the second axis 102 as a whole, so that the length of the angle grinder in the axial direction of the first axis can be shortened, and part of the gripping portion 210 can be arranged obliquely, so that the user can hold the angle grinder 100 more stably, improving the user's gripping feel.

[0062] Optionally, the housing of the angle grinder may also be a cylindrical housing, in which a rear bearing chamber is provided for supporting the rear bearing and the limit pull rod. A mounting hole is provided in the rotor shaft for placing the detection device, which is not a limitation.

[0063] Optionally, the motor may be an inductive motor, in which case the rear bearing chamber is sealed in the axial direction of the first axis to prevent dust from entering the motor accommodating chamber.

[0064] Reference Fig.14 The angle grinder also includes a display interface 800, which includes four display units 810 distributed in a row and a speed regulating mechanism 820. The four display units 810 can be lit up in sequence to indicate the current gear of the angle grinder. The four display units 810 can also flash or go out at the same time to indicate a fault state of the angle grinder. The speed regulating mechanism 820 is configured to be operated to wake up the display interface 800 when the display interface 800 is in an off-screen state, and to be operated to adjust the gear of the angle grinder when the display interface 800 is in an awake state, thereby changing the rotation speed of the output shaft. The battery pack is electrically connected to the display interface 800 and the speed regulating mechanism 820, respectively.

[0065] The angle grinder provided in this embodiment has a speed regulating mechanism 820 disposed at the rear end of the gripping portion, which can provide more gripping positions for the user and facilitate the use of the user. Once the angle grinder fails, the display unit 810 of the angle grinder can also prompt the user, thereby improving the user's satisfaction. By manipulating the speed regulating mechanism 820 of the present invention, the display interface 800 can be awakened when the display interface 800 is in the off state, and the gear position of the angle grinder can be adjusted when the display interface 800 is in the awake state. Since the display interface 800 and the speed regulating mechanism 820 of the angle grinder are always in an electrically connected state with the battery pack, that is, whether the output shaft is in a working state or not, the gear position of the angle grinder can be adjusted by the speed regulating mechanism 820 and displayed through the four display units 810. The display interface 800 is disposed at the rear end of the gripping portion, so that the user can obtain the information prompted by the display interface 800 more directly, and it is convenient for the user to adjust the gear position of the angle grinder through the speed regulating mechanism 820 on the display interface 800, and the current gear position information and fault information can be displayed through the display unit 810 of the display interface 800, and information is collected, so as to improve the efficiency of obtaining information and facilitate use. The display interface 800 with the speed adjustment structure is arranged at the rear end of the grip portion, and the user can set the speed at the tail end of the angle grinder, thereby improving the safety of use.

[0066] The gears of the angle grinder are different, and the speed of the motor is also different. As the gears are increased, the speed of the motor gradually increases. Since the angle grinder of this embodiment is provided with four gears, the number of display units 810 of this embodiment is four. The four display units 810 are arranged in a row and are electrically connected to the speed regulating mechanism 820 respectively. The number of display units 810 that are lit up is different for different gears of the angle grinder. Specifically, when the angle grinder is in the first gear, the first display unit 810 is lit; when the angle grinder is in the second gear, the first two display units 810 are lit; when the angle grinder is in the third gear, the first three display units 810 are lit; when the angle grinder is in the fourth gear, all four display units 810 are lit. Of course, in other embodiments of the present invention, the gears of the angle grinder are different, and the display units 810 in different positions can also be lit up.

[0067] The detection device also includes a current sensor or a voltage sensor for detecting the motor current value or voltage value, and the detection device is electrically connected to the battery pack and the control component 700. The detection device detects the state parameters of the angle grinder and transmits them to the control component 700, and the control component 700 analyzes the state parameter information obtained by the detection to obtain the current operation state of the angle grinder, specifically including the fault state of the angle grinder, and the control component 700 analyzes the prompt mode of the display interface 800, and controls the display unit 810 to flash or turn off accordingly, so as to timely remind the user of the fault state information of the angle grinder.

[0068] Of course, in other embodiments of the present invention, the angle grinder can also be a multi-function tool, a gun drill or other angle grinders. The gear position of the present invention and the lighting mode of the display unit 810 can also be in other forms. For example, the gear position of the angle grinder is different, and the position of the illuminated display unit 810 is different. The lighting mode of the display unit 810 corresponds to the gear position information of the angle grinder one by one, that is, when the angle grinder is in the first gear position, only the first display unit 810 is illuminated; when the angle grinder is in the second gear position, only the second display unit 810 is illuminated; when the angle grinder is in the third gear position, only the third display unit 810 is illuminated; when the angle grinder is in the fourth gear position, only the fourth display unit 810 is illuminated. In other embodiments, the gear position of the angle grinder and the lighting mode of the display unit 810 can also be in other one-to-one corresponding forms, and the gear position of the angle grinder and the lighting mode of the display unit 810 are specifically set according to actual needs. The working voltage of the angle grinder can be V, or V or other voltage values, which are specifically set according to actual conditions.

[0069] Of course, in other embodiments of the present invention, the gears of the angle grinder are not limited to four in this embodiment, and the corresponding number of display units 810 is not limited to four in this embodiment, but can also be other numbers. The number of display units 810 is set corresponding to the gears of the angle grinder.

[0070] The display interface 800 is disposed at the rear end of the grip portion, and the display interface 800 can display the gear position of the angle grinder, the speed of the motor, and fault information. The battery pack is located in the installation cavity and is electrically connected to the motor, the speed regulating mechanism 820, the display unit 810, and the display interface 800, respectively. The battery pack of this embodiment is a rechargeable battery pack. When charging the battery pack, in order to be able to display the charging status of the battery pack, a charging indicator mark is also provided on the angle grinder of this embodiment. When charging the battery pack, the current charging status of the battery pack can be viewed through the charging indicator mark, which is convenient for the user to charge the battery pack.

[0071] Reference Fig.15The speed regulating mechanism 820 of this embodiment is a button, and includes a first speed regulating mechanism 821 and a second speed regulating mechanism 822. The control component 700 includes a microcontroller unit (MCU, not 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 angle grinder to increase the speed of the output shaft, and the second speed regulating mechanism 822 is used to decrease the gear of the angle grinder to reduce the speed of the output shaft. Specifically, the first speed regulating mechanism 821 and the second speed regulating mechanism 822 can trigger different D values ​​(i.e., the value of the analog signal converted into a digital signal), and then the microcontroller unit determines the increase or decrease of the gear of the angle grinder through the different D values ​​detected, and the number of the illuminated display units 810 increases or decreases accordingly, so that the gear of the angle grinder corresponds to the number of the illuminated display units 810.

[0072] Furthermore, the angle grinder of this embodiment also includes a field effect transistor (not shown in the figure) located in the installation cavity, and the detection device also includes a temperature sensor (not shown in the figure), which is configured to detect the temperature of the field effect transistor, and the temperature sensor and the field effect transistor are electrically connected to the battery pack respectively.

[0073] It should be noted that the display interface 800, MCU, and speed regulation mechanism 820 of the angle grinder of this embodiment are always connected to the battery pack, that is, the battery pack always supplies power to the display interface 800, MCU, and speed regulation mechanism 820. Regardless of whether the above switches are in the on state or the off state, the display interface 800 is in the awake state, and the gear position of the angle grinder changes by pressing and releasing the speed regulation mechanism 820.

[0074] The control component 700 of this embodiment can be implemented as a processing and computing device such as a circuit board, an integrated circuit, or a single-chip microcomputer. As shown in the figure, the control component 700 is located in the installation cavity, and the control component 700 is connected to the battery pack. The 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 component 700, respectively. The control component 700 analyzes the operation of the angle grinder, such as the 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, so as to remind the user of the fault state of the current angle grinder, so as to facilitate the user to handle it in time, prevent further damage to the angle grinder, and prevent harm to the user or the environment.

[0075] The electric tool proposed in this application is not limited to an angle grinder. The electric tool is only introduced by taking an angle grinder as an example. The electric tool can also be an electric drill, a multi-function tool, an electric saw, etc. Figure 16 to Figure 18The motor 400a of the circular saw 100a has a motor housing 200a and an inner housing. The motor housing 200a is equivalent to the housing mentioned above, and the motor inner housing is equivalent to the rear bearing chamber 270a mentioned above. The rear bearing chamber 270a is connected to the housing by screws.

[0076] The second detection element 182a is arranged 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, and the rear bearing chamber 270a is roughly cylindrical, and the bracket 280a is fixed to the cylindrical bottom by screws. A through hole is provided at the bottom of the cylinder so that the second detection element 182a on the bracket 280a is opposite to the first detection element 181a to realize the detection of the rotation speed of the motor 400a. The rear end of the rotor of the motor 400a extends into 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

1. An electric tool comprising: case; an electric machine supported by the housing, the electric machine comprising at least a rotor shaft extending along a first axis; A bearing, the bearing is used to position the rotor shaft, the bearing comprising a front bearing and a rear bearing arranged at both ends of the motor; A switch, used to control the motor to be turned on and off; Operating parts, for users to operate; a control assembly connected to the switch, wherein the rear bearing is disposed between the motor and the control assembly; Characterized in that the electric tool also includes: A pull rod connecting the switch and the operating member; the switch is arranged between the motor and the control assembly; the operating member overlaps with the motor in the radial direction of the first axis; The housing comprises a main housing and a rear bearing chamber formed inside the main housing, the rear bearing chamber being used to support the rear bearing, and the rear bearing chamber comprising: an accommodating cavity, wherein the rear bearing is disposed in the accommodating cavity; A through hole for the pull rod to pass through; the through hole is formed between the main housing and the accommodating cavity; A partition portion is provided between the accommodating cavity and the through hole, the through hole is partitioned by the partition portion in the radial direction of the first axis, and the partition portion is integrally formed with the main housing.

2. The electric tool according to claim 1, characterized in that: The electric tool also includes a detection device for detecting the rotational 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, and the mounting hole and the projection of the rear bearing in the radial direction of the first axis at least partially overlap.

3. The electric tool according to claim 2, wherein: The housing further comprises a bracket for fixing the second detection element, and the bracket is arranged so that a projection of the bracket in the axial direction of the first axis at least partially overlaps with a projection of the accommodating cavity.

4. The electric tool according to claim 1, characterized in that: The through hole is disposed between the main housing and the accommodating chamber so that the pull rod is confined between the main housing and the motor.

5. The electric tool according to claim 4, characterized in that: The housing includes a motor accommodating portion, and the motor is arranged in the motor accommodating portion; An operating member is arranged on one side of the motor accommodation portion.

6. The electric tool according to claim 1, wherein: The electric tool comprises: A drive circuit, comprising a power line, wherein the power line connects the motor and the control component; The control component comprises: A power unit, wherein the power unit is connected to the power line; Heat dissipation components, including: substrate; A plurality of heat dissipation ribs connected to the substrate; A clamping area formed between the heat dissipation ribs; A connection hole is formed on the substrate, the power line passes through the connection hole, and a portion of the power line is fixed in the clamping section by the heat dissipation rib.

7. The electric tool according to claim 6, characterized in that: include: an output shaft for driving a working accessory, 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 a direction parallel to the first axis, a projection height of the power line is lower than a projection height of the heat dissipation rib.

8. The electric tool according to claim 7, wherein: The control component includes a first side and a second side parallel to the first axis, and a projection of the power line onto the first plane is within a region defined by a straight line where the first side and the second side are located.

9. The electric tool according to claim 7, wherein: The housing comprises: A motor housing portion, used for supporting the motor; A grip portion, wherein the control assembly is disposed within the grip portion; The electric tool further comprises a signal line, wherein the signal line connects the control component and the switch; The first plane separates the holding part into a first cavity and a second cavity, the first cavity and the second cavity are arranged on both sides of the control component, 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 second cavity.

10. The electric tool according to claim 9, wherein: The gripping portion is provided with a first air inlet and a second air inlet, the first air inlet is communicated with the first cavity, and the second air inlet is communicated with the second cavity.

Images