| 摘要 |
An electric linear motion actuator including: a locking mechanism capable of locking and unlocking the rotation of a rotor shaft (12) of an electric motor (11); wherein the locking mechanism includes: a plurality of locking holes (41) provided in the side surface of one (33) of a plurality of gears constituting a reduction gear mechanism (13) so as to be arranged in the circumferential direction of the one (33) of the plurality of gears; a locking pin (42) configured to be moved forward and backward with respect to the locking holes (41), and brought into engagement with one of the locking holes (41) to lock the gear (33) when the locking pin (42) is moved forward; and a linear solenoid (43) configured to move the locking pin (42) forward and backward. In this electric linear motion actuator, a plunger (49) provided in the linear solenoid (43) and the locking pin (42) are formed as separate parts, and disposed on the same axis such that one of the end surfaces of the linear solenoid (43), and of the locking pin (42), face each other in the axial direction. This prevents the moment load applied by the gear (33) to be locked to the locking pin (42) from acting on the plunger (49), thereby preventing a bobbin (48) slidably supporting the radially inner surface of the plunger (49) from being damaged. Further, the locking pin (42) is made of a non-magnetic material so that the magnetism of the magnetic circuit formed between a coil (47) of the linear solenoid (43) and the plunger (49) can be prevented from leaking through the locking pin (42). This allows the plunger (49) to be reliably attracted and moved by the magnetism when the coil (47) is energized, thereby improving the reliability of the locking operation. |
