Electric working machine

Abstract

The present invention provides an electric working machine in which a control board can be disposed without limitations based on a length of a brushless motor in a direction along an axial line. The electric working machine comprises: a brushless motor provided with a rotor and a stator; a motor case and a motor housing in which the brushless motor is stored; a control board which is provided outside of the motor housing in a radial direction of an axial line defined at the center of the rotor, and supports the switching elements; a connection board which is provided in the motor case, and supports the sensors; a through hole provided on the motor case; a through hole provided on the motor housing; and leads and signal lines extending from inside of the motor housing to the outside of the motor housing through the holes.

1 . An electric working machine comprising:
 a motor including an output shaft;   a motor case having a cylindrical shape extending in parallel with a first axis of the output shaft, the motor case accommodating the motor, the motor case comprising a side wall surrounding the motor and a bottom disposed at one end of the side wall;   a first control unit comprising first circuit elements to control the motor, the first control unit being disposed outside the side wall of the motor case;   a second control unit comprising second circuit elements to control the motor, the second control unit being disposed inside the side wall of the motor case;   a fan disposed inside the side wall of the motor case, the fan rotating when the output shaft is driven;   a housing at least partially covering the motor case; and   an electric path connecting the first circuit elements with the second circuit elements,   wherein the motor case has a first opening in the bottom and a second opening in the side wall,   wherein the electric path passes through the second opening, and   wherein the electric working machine has a first air path connecting outside of the housing and inside of the motor case through the first opening, and a second air path connecting outside of the housing and inside of the motor case through the second opening.   
     
     
         2 . The electric working machine according to  claim 1 , further comprising a first bearing and a second bearing that support the output shaft,
 wherein the output shaft runs through the first bearing, the motor, and the second bearing in that order, and   wherein the first bearing, the second opening, and the second bearing are arranged in that order along a first direction parallel with the first axis.   
     
     
         3 . The electric working machine according to  claim 2 , wherein the first bearing, the first and second control units, and the second bearing are arranged in that order along the first direction. 
     
     
         4 . The electric working machine according to  claim 2 , wherein the first opening surrounds the second bearing. 
     
     
         5 . The electric working machine according to  claim 1 ,
 wherein the second control unit comprising a circuit board on which the second circuit elements are disposed, the circuit board having a first surface and a second surface, the first surface and the second surface crossing the first axis, the first surface is closer to the first control unit than the second surface,   wherein the electric path including wiring that runs from the first surface of the circuit board to the first control unit.   
     
     
         6 . The electric working machine according to  claim 1 ,
 wherein the housing has a third opening,   wherein the second air path connects outside of the housing and inside of the motor case through the third opening, and   wherein the first control unit is disposed in the second air path.   
     
     
         7 . The electric working machine according to  claim 1 , further comprising:
 a tip tool; and   a hammering element that delivers striking force to the tip tool along a second axis crossing the first axis.   
     
     
         8 . The electric working machine according to  claim 7 , wherein the tip tool, the motor, and the first control unit are arranged in that order along a second direction parallel with the second axis. 
     
     
         9 . An electric working machine comprising:
 a motor including an output shaft;   a motor case having a cylindrical shape extending in parallel with a first axis of the output shaft, the motor case accommodating the motor, the motor case comprising a side wall surrounding the motor and a bottom disposed at one end of the side wall;   a first control unit comprising first circuit elements to control the motor, the first control unit being disposed outside the side wall of the motor case;   a second control unit comprising second circuit elements to control the motor, the second control unit being disposed inside the side wall of the motor case;   a fan disposed inside the side wall of the motor case, the fan rotating when the output shaft is driven;   a housing at least partially covering the motor case;   a first bearing and a second bearing that support the output shaft, the output shaft running through the first bearing, the motor, and the second bearing in that order; and   an electric path connecting the first circuit elements with the second circuit elements,   wherein the motor case has a first opening in the bottom and a second opening in the side wall,   wherein the electric path passes through the second opening, and   wherein the first bearing, the second opening, and the second bearing are arranged in that order along a first direction parallel with the first axis.   
     
     
         10 . The electric working machine according to  claim 9 , further comprising:
 a tip tool; and   a hammering element that delivers striking force to the tip tool along a second axis crossing the first axis.   
     
     
         11 . The electric working machine according to  claim 10 , wherein the tip tool, the motor, and the first control unit are arranged in that order along a second direction parallel with the second axis.