Nitto Kohki Co., Ltd.

Takashi Nakajoh

Yasumasa Suzuki

Kuniaki Shibuya

Munenori Yamaguchi

Atsushi Miura

A vane air motor is disclosed which is configured to prevent grease in a radial bearing from leaking into a rotor chamber. The vane air motor has a motor housing () having a rotor chamber, a rotor () with vanes () disposed in the rotor chamber, a first end wall () of the motor housing equipped with a radial bearing () rotatably supporting a support shaft portion () of the rotor, and a casing contiguously joined to the motor housing to form a compressed air supply chamber () together with the first end wall to supply compressed air into the rotor chamber through an air supply hole () formed in the first end wall. The first end wall has communication means (--and-) for supplying compressed air from the compressed air supply chamber to the side of the first radial bearing closer to the rotor.

Vane air motor with prevention of leaking radial bearing grease

A vane air motor configured to prevent uneven wear of vanes is provided. The vane air motor has a cylindrical member having a rotor chamber () defined by a circular cylindrical inner peripheral surface (), and a vaned rotor. A plurality of air discharge openings () are provided over a predetermined length range in the axial direction of the rotor chamber. Each pair of axially adjacent air discharge openings are spaced from each other and overlap each other as seen in the circumferential direction of the rotor chamber.

Vane air motor

The invention of this application provides a pneumatic tool with a simple structure. The tool has a tubular housing, a stationary shaft, a first piston slidable along the stationary shaft, a second piston, a tool attachment member drivingly connected to the second piston, a compressed air supply path extending through the stationary shaft to supply compressed air between the first and second pistons, and an air discharge path for discharging the compressed air supplied between the first and second pistons to the outside of the housing when the first and second pistons are separated by a predetermined distance. The compressed air supply path has an axial portion in the stationary shaft and a radial portion, a compressed air inlet recess in the inner wall surface of a shaft sliding hole, and a supply outlet extending forward from the forward end of the compressed air inlet recess and communicating with a portion between the first and second pistons.

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Tokyo, Japan

Takashi Nakajoh