CN218396252U

CN218396252U - Electric tool

Info

Publication number: CN218396252U
Application number: CN202222399720.2U
Authority: CN
Inventors: 戴伟
Original assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Current assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-01-31
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to an electric tool belongs to power tool technical field. The tool includes a motor located within a housing; a shell of the motor and an end cover fixedly connected with the shell support a motor shaft fixedly connected with the rotor, and the motor shaft is in transmission connection with the tool head; a rear winding frame, a stator core and a front winding frame are inserted and fixed in the shell, and windings form a stator; the opening end of the shell is provided with two shoulders which are positioned in the notches which are uniformly distributed in the circumferential direction, and the outer end of the front end plate of the front winding frame is provided with corresponding fixing lugs which are uniformly distributed in the circumferential direction and extend radially; during assembly, the fixing lug is limited on the shoulder in the notch, passes through the fixing lug and the notch through the fastener, and is screwed and fastened in the internal thread hole of the shell, so that axial and circumferential limiting fixation is realized. Adopt the utility model discloses afterwards, part is small in quantity, and axial dimension is compacter, is favorable to reducing electric tool's trouble, prolongs its life.

Description

Electric tool

Technical Field

The utility model relates to an electric tool, especially a reciprocating saw belongs to power tool technical field.

Background

U.S. patent No. US10511208 discloses a power tool of a typical construction: a tool holding portion having a front end and a rear end and including a front end, the tool holding portion configured to hold a detachable tool; a brushless motor having a stator and a rotor within the stator, the rotor configured to drive the tool holder; a motor inner case surrounding the brushless motor; the tool housing includes: the shell area surrounds the motor inner shell; and an annular handle at a rear end of the power tool, the annular handle configured with an external air inlet configured to deliver cold air to the brushless motor; a fan located at a front side of the rotor; and a pressure plate located at the front side of the stator and the rear side of the fan; the pressure plate is attached to the motor inner housing.

This kind of power tool need realize with the help of solitary clamp plate that motor stator links firmly with the axial positioning of shell, and the clamp plate space need be left to axial when not only making many, the assembly to the part quantity, moreover to the obvious electric tool of vibration during the work such as reciprocating saw, because the stator links firmly in the shell through the clamp plate is indirect, consequently is unfavorable for guaranteeing stator winding's stability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an: aiming at the defects of the prior art, the electric tool which is beneficial to stabilizing the stator winding of the motor and improving the manufacturing and assembling processes is provided through structural improvement.

In order to achieve the above purpose, the utility model discloses electric tool's basic technical scheme is: comprises a motor positioned in a shell; the shell of the motor and the end cover fixedly connected with the shell support a motor shaft fixedly connected with the rotor, and the motor shaft is in transmission connection with the tool head;

a rear winding frame, a stator core and a front winding frame are fixedly inserted in the shell, and a stator is formed by winding;

the opening end of the shell is provided with two shoulders which are positioned in the notches which are uniformly distributed in the circumferential direction, and the outer end of the front end plate of the front winding frame is provided with corresponding fixing lugs which are uniformly distributed in the circumferential direction and extend radially; during the equipment, fixed ear is spacing in the intraoral circular bead of breach, passes fixed ear and breach through the fastener, revolve twist in the internal thread hole of casing is fastened, realizes the spacing fixedly of axial and circumference.

Adopt the utility model discloses a behind the structure, the stator directly links firmly with the casing through the preceding bobbin of self, consequently is less than prior art part quantity, and axial dimension is compacter, and the result makes motor stator winding keep firm at work because of having reduced fixed connection's transition piece to be favorable to reducing electric tool's trouble, prolong its life.

The utility model discloses further perfect is: the stator core inwards forms six uniformly distributed fan-shaped section slots, the rear winding frame and the front winding frame respectively comprise a rear end disc and a front end disc, the rear end disc and the front end disc respectively axially extend out six uniformly distributed fan-shaped section rear inserting claws and front inserting claws, and the rear inserting claws and the front inserting claws are respectively inserted into the fan-shaped section slots matched with the rear inserting claws and the front inserting claws from two ends of the stator core to be positioned during assembly.

The utility model discloses further perfection is again: the excircle of stator core has interval distribution's axial groove of stepping down, gives out the space that the fastener passed during the assembly.

The utility model discloses further perfect is: and a circuit board for leading out each coil winding is fixed between the cylinder bottom of the shell and the stator.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 isbase:Sub>A schematic sectional viewbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a schematic structural diagram of a motor part of the embodiment of fig. 1.

Fig. 4 is a schematic structural view of the section B-B of fig. 3.

Fig. 5 is a schematic perspective exploded view of the stator part in fig. 4.

Fig. 6 is a perspective view of the housing of fig. 4.

Detailed Description

Example one

The electric tool of the present embodiment is a reciprocating saw, and its basic structure is as shown in fig. 1, one end of its housing 3 forms a handle 1, the bottom of the handle 1 is equipped with a battery pack 5, the front end of the handle 1 is equipped with a motor 2 located in the housing 3, and the motor 2 is in transmission connection with a tool head 4 extending from the front end of the housing 3 through a transmission mechanism.

The basic structure of the motor 2 is shown in fig. 2, and comprises a shell 2-1 fixed in a shell 3 and a stator 2-2 fixed in the shell 2-1, wherein the shell 2-1 and an end cover 2-4 fixedly connected with the shell support a motor shaft 2-5 fixedly connected with a rotor 2-3, and the motor shaft 2-5 is in transmission connection with a tool head 4 through a reciprocating motion transmission mechanism 6.

The specific structure of the motor 2 is as shown in fig. 3 to 6, after the rear bobbin 2-2.1, the stator core 2-2.2 and the front bobbin 2-2.3 are fixedly connected in the cylindrical housing 2-1, the surrounding coil 2-2.4 forms the stator 2-2, and a circuit board (PCB board) 2-6 for leading out the coil windings is fixed between the bottom of the housing 2-1 and the stator 2-2.

Six uniformly distributed slots with sector cross sections 2.2-2 are formed inwards by the stator iron core 2-2.2. The rear bobbin 2-2.1 and the front bobbin 2-2.3 respectively comprise a rear end disc 2.1-1 and a front end disc 2.3-1, the rear end disc 2.1-1 and the front end disc 2.3-1 respectively axially extend to form six sector section rear inserting claws 2.1-2 and front inserting claws 2.3-2 which are uniformly distributed on the circumference, and the rear inserting claws 2.1-2 and the front inserting claws 2.3-2 are respectively inserted into the matched sector section inserting grooves 2.2-2 from the two ends of the stator iron core 2-2.2 for positioning so as to wind six groups of coils 2-2.4.

The opening end of the shell 2-1 is provided with three shoulders 2-1-4 positioned in the notches 2-1-2 which are uniformly distributed in the circumferential direction, and the outer end of the front end disc 2.3-1 of the front bobbin 2-2.3 is provided with three fixing lugs 2.3-3 which are uniformly distributed in the circumferential direction and extend radially. When the shell is assembled, the fixing lug 2.3-3 is limited on the shoulder 2-1-4 in the notch 2-1-2, and the screw 7 penetrates through the fixing lug 2.3-3 and the notch 2-1-2, is screwed in the internal threaded hole 2-1-3 of the shell 2-1 and is fastened tightly, so that axial and circumferential limiting fixing is realized. The excircle of the stator core 2-2.2 is provided with axial yielding grooves 2.2-1 which are distributed at intervals, and a space for the screw 7 to pass through is reserved during assembly, so that the structure is compact.

After the structure of this embodiment is adopted, because the stator directly links firmly with the casing through the preceding bobbin of self, not only save the clamp plate and reduced part quantity, shortened axial dimension, owing to reduced the transition link in linking firmly moreover, consequently make motor stator winding also can remain throughout in the working vibration of reciprocating saw firm.

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. A power tool comprising a motor located within a housing; the shell of the motor and the end cover fixedly connected with the shell support a motor shaft fixedly connected with the rotor, and the motor shaft is in transmission connection with the tool head;

a rear winding frame, a stator core and a front winding frame are fixedly inserted in the shell, and a stator is formed by winding; the method is characterized in that:

the opening end of the shell is provided with two shoulders which are positioned in the notches which are uniformly distributed in the circumferential direction, and the outer end of the front end disc of the front winding frame is provided with corresponding fixing lugs which are uniformly distributed in the circumferential direction and extend radially; during the equipment, fixed ear is spacing in the intraoral circular bead of breach, passes fixed ear and breach through the fastener, revolve twist in the internal thread hole of casing is fastened, realizes the spacing fixedly of axial and circumference.

2. The power tool of claim 1, wherein: the stator core inwards forms six uniformly distributed fan-shaped section slots, the rear winding frame and the front winding frame respectively comprise a rear end disc and a front end disc, the rear end disc and the front end disc respectively axially extend out six uniformly distributed fan-shaped section rear inserting claws and front inserting claws, and the rear inserting claws and the front inserting claws are respectively inserted into the fan-shaped section slots matched with the rear inserting claws and the front inserting claws from two ends of the stator core to be positioned during assembly.

3. The power tool of claim 2, wherein: the excircle of stator core has interval distribution's axial groove of stepping down, gives out the space that the fastener passed during the assembly.

4. The power tool of claim 3, wherein: and a circuit board for leading out each coil winding is fixed between the cylinder bottom of the shell and the stator.