A GAS DRIVEN ROTATION MOTOR, A TOOL PROVIDED WITH A GAS DRIVEN ROTATION MOTOR AND A METHOD FOR REGULATING THE ROTATION SPEED OF A GAS DRIVEN ROTATION MOTOR

摘要

The invention relates to a gas driven rotation motor, a tool provided with a gas driven rotation motor and a method for regulating the rotation speed of a gas driven rotation motor. The gas driven rotation motor comprises a housing (2), a gas driven rotating member (1) comprising a rotor (3) and a rotor shaft (7,8) carrying the rotor and journalled in a first bearing (5,25) and a second bearing (6) supported in the housing (2), and a speed governor (4) for controlling a pressure gas inlet flow in response to the rotation speed of the rotating member. The first bearing (5, 25) comprises a set of rolling elements (12, 32), an outer race (9, 29) arranged in the housing and an inner race (10, 30) arranged on a shaft portion (7) of the rotating member, said set of rolling elements being in contact with said races on which the rolling elements roll. The motor further comprises a coupling device (15, 35) arranged to couple the speed governor (4) to the rolling elements (12,32) of the first bearing (5,25), thereby transferring the rotary motion from the rolling elements (12,32) to the speed governor (4).