Electric cylinder and work machine
AssigneeKomatsu Ltd.
InventorsHideshi Iitani, Shouta Akazaki
Life of this patent
Estimating the term…
Abstract
An electric cylinder includes a motor that is a driving source, an output shaft configured to rotate in response to driving of the motor, a sun gear coupled to the output shaft and configured to rotate in response to the rotation of the output shaft, a tubular holder disposed adjacent to an axial end surface of the motor and including a fluid accommodation portion that allows a magnetic fluid to be accommodated between the holder and an outer periphery of the sun gear, a pair of magnetic pole pieces provided on an inner peripheral surface of the holder, and a magnet disposed between the pair of magnetic pole pieces and configured to hold the magnetic fluid in the fluid accommodation portion by using an action of a magnetic field.
Claims20
An electric cylinder comprising:
- a motor that is a driving source;
- an output shaft configured to rotate in response to driving of the motor;
- a sun gear coupled to the output shaft and configured to rotate in response to rotation of the output shaft;
- a tubular holder disposed adjacent to an axial end surface of the motor and including a fluid accommodation portion that allows a magnetic fluid to be accommodated between the holder and an outer periphery of the sun gear;
- a pair of magnetic pole pieces provided on an inner peripheral surface of the holder;
- and
- a magnet disposed between the pair of magnetic pole pieces and configured to hold the magnetic fluid in the fluid accommodation portion by using an action of a magnetic field.
Dependencies are inferred from the claim text.