An electric actuator includes a forwardly and reversely rotatable electric motor, a motion conversion mechanism configured to convert a rotation of the electric motor into a reciprocating linear motion of a screw shaft, an actuator case containing the electric motor and the motion conversion mechanism, and a boot covering a portion of the screw shaft that extends out of the actuator case. A vent is formed on the actuator case. The vent is configured to ventilate a sealingly closed space in the actuator case and the boot. A breathable waterproof member is provided on the vent and a cover member is also provided on the vent. The breathable waterproof member is configured to block entry and exit of water while permitting entry and exit of air. The cover member is configured to cover the vent so as to allow ventilation with outer air. Due to this configuration, the electric actuator can inhibit a change in the inner pressure in the actuator to thus achieve the improvement of the durability of the boot with a simple structure without causing an increase in the number of components and the complication of the structure and leading to a cost increase accompanying them.
ELECTRIC ACTUATOR AND VEHICLE DRUM BRAKE COMPRISING SAME
ELEKTRISCHER AKTUATOR UND FAHRZEUGTROMMELBREMSE DAMIT
ACTIONNEUR ÉLECTRIQUE ET FREIN À TAMBOUR DE VÉHICULE LE COMPRENANT
2024-04-17
Patent
Electronic Resource
English
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