Die grinder

Abstract

A die grinder includes a motor, a spindle and a main housing. The spindle is rotated around a drive axis that defines a front-rear direction of the die grinder. The main housing includes a motor housing, a handle housing and a battery housing. The handle housing is connected to a rear end of the motor housing and has an elongate grip part configured to be held by a user. The battery housing is connected to a rear end of the handle housing and has a battery mounting part configured such that the battery is mounted thereto. The battery mounting part is arranged in a position through which the drive axis passes and configured such that the battery is mounted in a direction orthogonal to the drive axis. A center axis of the grip part is arranged outward of the drive axis in a radial direction.

1 . A die grinder, comprising:
 a motor that is driven by power supplied from a battery;   a spindle that is rotated by power of the motor around a drive axis that defines a front-rear direction of the die grinder; and   a main housing, including:   a motor housing that houses the motor,   a handle housing that is connected to a rear end of the motor housing and has an elongate grip part configured to be held by a user, and   a battery housing that is connected to a rear end of the handle housing and has a battery mounting part configured such that the battery is mounted thereto;   wherein:   the battery mounting part is arranged in a position through which the drive axis passes and configured such that the battery is mounted in a direction orthogonal to the drive axis, and   a center axis of the grip part is arranged outward of the drive axis in a radial direction.   
     
     
         2 . The die grinder as defined in  claim 1 , wherein, when a direction in which the battery is mounted to the battery mounting part is defined as an up-down direction of the die grinder, the drive axis is arranged to pass a middle point between an upper end and a lower end of the battery mounted to the battery mounting part when the die grinder is viewed from the side. 
     
     
         3 . The die grinder as defined in  claim 1 , further comprising:
 a controller configured to control driving of the motor,   wherein:   the controller is arranged in a position through which the drive axis passes, and extends in a direction orthogonal to the drive axis when the die grinder is viewed from the side.   
     
     
         4 . The die grinder as defined in  claim 3 , wherein the controller is housed behind the grip part within the main housing. 
     
     
         5 . The die grinder as defined in  claim 3 , wherein:
 the main housing has an air inlet from which outside air is led into the main housing, and the controller is arranged to overlap at least part of the air inlet when the die grinder is viewed from the side.   
     
     
         6 . The die grinder as defined in  claim 1 , wherein:
 the motor includes a stator having a stator core, a rotor and a motor shaft that rotates together with the rotor,   the motor is housed in the motor housing such that a rotation axis of the motor shaft extends in parallel to the front-rear direction, and   a length of the stator core in the front-rear direction is 30 mm or less.   
     
     
         7 . The die grinder as defined in  claim 1 , further comprising a shaft locking mechanism that locks the spindle while the spindle is stopped rotating. 
     
     
         8 . The die grinder as defined in  claim 7 , further comprising:
 a coupling that connects a motor shaft of the motor and the spindle such that a rotation axis of the motor shaft coincides with the drive axis,   wherein:   the shaft locking mechanism is configured to lock the spindle by engagement between the shaft locking mechanism and the coupling.   
     
     
         9 . The die grinder as defined in  claim 1 , further comprising:
 a switch that turns on and off the motor according to user's operation of a first operation part,   wherein:   the switch is housed in the grip part.   
     
     
         10 . The die grinder as defined in  claim 1 , comprising:
 a second operation part that adjusts the rotation speed of the motor,   
       wherein:
 the second operation part is arranged behind the grip part. 
 
     
     
         11 . The die grinder as defined in  claim 1 , wherein a length from a rear end to a front end of the grip part in the front-rear direction is 60 mm or more. 
     
     
         12 . The die grinder as defined in  claim 1 , wherein a circumferential length of the grip part in a cross section orthogonal to the drive axis is 150 mm or less. 
     
     
         13 . A die grinder, comprising:
 a motor that is driven by power supplied from a battery;   a spindle that is rotationally driven by power of the motor around a drive axis that defines a front-rear direction of the die grinder; and   a main housing, including:   (i) a motor housing that houses the motor,   (ii) a handle housing that is connected to a rear end of the motor housing and has an elongate grip part configured to be held by a user,   (iii) a tool housing that is connected to a front end of the motor housing and in which the spindle is arranged, and   (iv) a battery housing that is connected to a rear end of the handle housing and has a battery mounting part configured such that the battery is mounted thereto;   wherein:   a length of the main housing from a rear end of the battery housing to a front end of the tool housing in the front-rear direction is 400 mm or less.   
     
     
         14 . The die grinder as defined in  claim 13 , wherein a length of the main housing from the rear end of the battery housing to a front end of the motor housing in the front-rear direction is 260 mm or less. 
     
     
         15 . The die grinder as defined in  claim 13 , wherein a length from a rear end to a front end of the grip part in the front-rear direction is 60 mm or more. 
     
     
         16 . The die grinder as defined in  claim 13 , wherein a circumferential length of the grip part in a cross section orthogonal to the drive axis is 150 mm or less.