Gas driven rotation motor, a tool provided with a gas driven rotation motor and a method for regulating speed of a gas driven rotation motor

A gas driven rotation motor comprising:

• a housing;
• a gas driven rotating member comprising a rotor and a rotor shaft which carries the rotor and which is journalled in a first bearing and a second bearing supported in the housing;
• a speed governor which controls a pressure gas inlet flow in response to a rotation speed of the rotating member, said first bearing comprising a set of rolling elements;
• an outer race arranged in the housing and an inner race arranged on the shaft portion of the rotating member, said set of rolling elements being in contact with said races on which the rolling elements roll;
• and
• a coupling device comprising a set of pins, which pins are adapted to transfer the rotary motion of the rolling elements to the coupling device,
• wherein the coupling device further comprises a connection portion for connecting the coupling device with the speed governor, whereby the rotary motion is further transferred from the coupling device to the speed governor.