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CN-122001133-A - Brushless electric tool

CN122001133ACN 122001133 ACN122001133 ACN 122001133ACN-122001133-A

Abstract

The invention relates to a brushless electric tool which comprises a brushless motor, a control board, a conductive connecting element and a through hole, wherein the brushless motor comprises a stator assembly, the stator assembly comprises an outgoing line, one end of the outgoing line extends to the outer side of the stator assembly, the control board is used for controlling the brushless motor to operate, the conductive connecting element is electrically connected with the control board and is provided with the through hole, one end of the outgoing line is correspondingly arranged with the through hole, and one end of the outgoing line is inserted into the through hole and is electrically connected with the through hole. According to the brushless electric tool, the outgoing line is electrically connected with the conductive connecting element through the conductive connecting element, and the outgoing line does not need to be bent, so that the assembly efficiency is improved, the assembly cost is reduced, the reject ratio of a product is reduced, the service life of the product is prolonged, and the use safety of the product is improved.

Inventors

  • LI JIE
  • XIE JINXUN
  • ZHANG XIPING

Assignees

  • 江苏东成工具科技有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. A brushless power tool, characterized in that the brushless power tool (100) comprises: A brushless motor (3) comprising a stator assembly (31), the stator assembly (31) comprising a winding (311), one end of a wire used for forming the winding (311) directly forming an outgoing wire (3111), the outgoing wire (3111) extending from an outgoing position of the stator assembly (31) to an outside of the stator assembly (31); a control board (4) for controlling the operation of the brushless motor (3); And a conductive connecting element (5) with one end fixed to the control board (4) and the other end protruding out of the control board (4) and extending toward the lead-out wire (3111) at the lead-out position of the stator assembly (31), the lead-out wire (3111) being directly electrically connected to the conductive connecting element (5).
  2. 2. The brushless electric tool according to claim 1, wherein the lead wire (3111) is free from a biasing force to the conductive connecting member (5) after the lead wire (3111) is led out along the lead position and connected to the conductive connecting member (5).
  3. 3. A brushless electric tool according to claim 2, characterized in that the conductive connection element (5) is provided with a through-hole (51), and that the end of the outgoing wire (3111) extending to the outside of the stator assembly (31) is inserted into the through-hole (51) and both are electrically connected.
  4. 4. The brushless electric tool according to claim 1, characterized in that the brushless electric motor (3) comprises three outgoing wires (3111), the number of conductive connecting elements (5) being three; The three outgoing lines (3111) are arranged in one-to-one correspondence with the through holes (51) of the three conductive connecting elements (5), and one ends of the outgoing lines (3111) are inserted into the through holes (51) corresponding to the positions and are electrically connected with the through holes.
  5. 5. The brushless electric tool according to claim 1, wherein the stator assembly (31) further comprises a bobbin (312) and a stator core (313), the bobbin (312) being located at one end of the stator core (313), the bobbin (312) being provided with a threading slot (3121), the first end of the outgoing wire (3111) extending outside the bobbin (312) after being threaded out of the threading slot (3121).
  6. 6. The brushless power tool according to claim 5, wherein a portion of the outgoing line (3111) between the threading groove (3121) and the penetration hole (51) is in a straight line extension shape.
  7. 7. The brushless electric tool according to claim 1, characterized in that the brushless motor (3), the conductive connecting element (5) and the control board (4) are arranged in this order from top to bottom, the first end of the outgoing line (3111) being located behind the control board (4); The two ends of the conductive connecting element (5) are respectively provided with a first connecting section (52) and a second connecting section (53), the through hole (51) is formed in the first connecting section (52), the first connecting section (52) obliquely extends backwards and upwards to be electrically connected with the outgoing line (3111), and the second connecting section (53) downwardly extends to be electrically connected with the control board (4).
  8. 8. The brushless electric tool according to claim 7, wherein the conductive connecting element (5) further comprises a joint section (54) connected at both ends thereof to the first connecting section (52) and the second connecting section (53), respectively; the axis of the brushless motor (3) extends along the horizontal direction, the control board (4) is horizontally arranged, and at least a partial part of the connecting section (54) extends along the horizontal direction.
  9. 9. A brushless electric tool according to any one of claims 1-8, characterized in that the conductive connecting element (5) is a resilient metal sheet.
  10. 10. The brushless electric tool according to any one of claims 1-8, characterized in that the first end of the outgoing wire (3111) is electrically connected to the electrically conductive connecting element (5) by soldering; And/or the conductive connecting element (5) and the control board (4) are electrically connected through welding; and/or the through hole (51) comprises a through hole or a blind hole.

Description

Brushless electric tool Technical Field The invention relates to the technical field of electric tools, in particular to a brushless electric tool. Background A brushless power tool is a power tool using brushless motor technology that can provide higher efficiency and longer life. As shown in fig. 1a, a brushless power tool generally includes a main body 1, a handle 2, and a battery holder (not shown) sequentially disposed from top to bottom, the handle 1 is provided with a switch 21, and due to the limitation of the shape of the housing of the brushless power tool, the lateral space of the housing is limited to only two parts, namely, the main body 1 and the battery holder, the main body 1 is mainly used for accommodating the brushless motor 3, and the battery holder is used for accommodating the battery pack, thereby resulting in limitation of the disposition position of the control board 4, and in the current brushless power tool, the control board 4 is disposed between the brushless motor 3 and the switch 21, which results in a relatively close distance between the brushless motor 3 and the control board 4. The brushless motor has three lead-out wires, and the lead-out wires are enameled wires, and are connected with the control board to realize the electric connection of the brushless motor and the control board. Wherein, brushless motor and the connection of control panel generally include two kinds of connection schemes as follows: (1) The outgoing line of the brushless motor is directly welded on the control board after being led out; (2) The outgoing lines and the control board are connected by other kinds of wires, such as silicone wires. Regarding the above scheme (1), since the lead-out wire is hard, in a limited space, the lead-out wire needs to be bent to smoothly run, which requires tooling, shaping and special bending equipment, and is time-consuming and labor-consuming. In addition, lead-out wire needs many times to buckle in some brushless electric tools, and many times buckle and cause the lead-out wire material to be impaired easily to limited space leads to the lead-out wire to lead to the fact the stress that the lead-out wire produced because of buckling can't release, leads to the lead-out wire after buckling to lead to the fact oppression to control panel or brushless motor, and makes scheme (1) use limited. In the process of assembling the brushless electric tool, the outgoing line of the brushless motor is firstly bent and then welded with the control board, then the brushless motor and the control board are placed in the shell together, the control board and the shell are fixed through a plurality of screws, and the brushless motor and the inner wall of the shell are assembled through clamping grooves and clamping protrusions. Fig. 1a, fig. 1b and fig. 1c are ideal states of the outgoing line 3111 (the outer circumference of the outgoing line 3111 is sleeved with the first heat-shrinkable tube 6) after twice bending treatment of about 90 ° or exactly 90 °, and fig. 1d and fig. 1e are actual states of the outgoing line 3111 after bending treatment, which result in shaping failure due to stress release, in the actual states, angles of two bending positions are larger than 90 °, so that in the process of installing the assembled brushless motor and control board into the casing, the actual states need to be manually adjusted to the ideal states, which results in increased labor cost and assembly difficulty, and when the brushless motor and the control board after the adjustment state are installed into the casing, the brushless motor and the casing are assembled firmly by screw fixation, so that the brushless motor is easily separated from the clamping connection of the casing under the stress of the outgoing line, and safety accidents in the subsequent use process are caused. And the lead wire in scheme (1) can not overlength nor too short, and the lead wire overlength can make its and control panel welding back have unnecessary crooked, and the lead wire is too short can make its and control panel welding back be pulled two and lead to the connection unstable. Regarding the above scheme (2), the lead-out wire and the silica gel wire are generally connected by welding, which increases labor cost, and has strength defects, and the welded part of the lead-out wire and the silica gel wire is easily broken for an electric tool (such as an impact screwdriver) which generates large vibration in the use process. In addition, the silica gel line is softer, can't design, and at the in-process of assembly, the silica gel line is prone to become a group easily, needs the manual work to fill in the limited space in the casing with one by one in with the silica gel line, and assembly efficiency is low. In addition, the silica gel wire is bent for a plurality of times in a limited space, so that the problem of surface skin breakage is easy to occur, and the defects of low effective utilization