Power tool

Abstract

A power tool includes a case and a motor installed within the case. The motor has a motor housing and a rotor with shaft. A gear train having a gear train housing and a speed reduction mechanism is installed within the gear train housing and connected to the shaft of the motor. The motor housing and the gear train housing are integrally formed as a common housing and fixed relative to the case.

1 . A power tool comprising:
 a case;   a motor installed within the case, the motor comprising a motor housing and a rotor including a motor shaft;   a gear train comprising a gear train housing and a speed reduction mechanism installed within the gear train housing and connected to the motor shaft;   wherein the motor housing and the gear train housing are integrally formed as a common housing having a single piece monolithic construction and fixed relative to the case, the common housing having a motor end remote from the gear train and a gear train end remote from the motor;   a fan is fixed to the rotor and located within the common housing;   inner and outer bearing brackets are fixed to the common housing to support the rotor via bearings, the fan being axially located between the inner and outer bearing brackets, the outer bearing bracket closing the motor end of the common housing and having vents for passage of air drawn in by the fan to cool the motor; and   the motor further comprising one of a brush card and a circuit board fixed to the inner bearing bracket.   
     
     
         2 . The power tool of  claim 1 , wherein the common housing defines radial openings to radially expose the fan. 
     
     
         3 . The power tool of  claim 1 , wherein the motor is a brush motor having brushes and a commutator, and the motor housing defines radial openings to expose the brushes, commutator, and the fan. 
     
     
         4 . The power tool of  claim 1 , wherein a pair of power leads arranged to provide power to the one of a brush card and a circuit board of the motor extends through a radial opening of the motor housing to connect to a switch of the power tool. 
     
     
         5 . The power tool of  claim 1 , wherein a ring gear closes the gear train end of the common housing, the inner bearing bracket being located between the outer bearing bracket and the ring gear.