Vibration motor having through hole formed in rotor
View Patent ↗The present invention relates to a vibration motor having a through hole formed in a rotor, in which: a rotor that penetrates and is coupled to a motor housing and a vibrating part plays a role of receiving a cleaning solvent and at the same time acts as a vibration transmission medium, and thus, no separate supply pipe is required, thereby contributing to cost reduction and productivity improvement; simplification of an internal structure assists in improving performance; a nozzle is detachably fixed to a front end of the rotor, and thus, various types of nozzles can be selectively replaced according to an object to be cleaned; and an object to be cleaned can be effectively washed by supplying various cleaning solvents such as water, oil, powder, and air to the through hole in the rotor.
1 . A vibration motor having a through hole formed in a rotor, the vibration motor comprising:
a motor housing;
a vibrating part coupled to opposite inner sides of the motor housing and providing vibration while rotating the rotor in forward and reverse directions;
the rotor having a predetermined length, having the through hole formed therein, and coupled to an inner central portion of the motor housing;
a nozzle detachably coupled to a front side of the rotor;
a coupling part fixing the rotor to the nozzle;
bearings coupled to the rotor inside the motor housing and guiding rotation of the rotor; and
front and rear covers coupled to front and rear sides of the motor housing,
wherein the motor housing comprises:
a body portion;
a mounting hole formed through an inner central portion of the body portion;
a coupling space formed at each of opposite sides of an inside of the body portion around the mounting hole to allow the vibrating part to be coupled thereto; and
a coupling hole formed at each of upper and lower portions of a rear end of the body portion to allow the rear cover to be coupled thereto.
2 . The vibration motor of claim 1 , wherein the vibrating part comprises:
a stator mounted at each of the opposite sides of the inside of the body portion of the motor housing;
an insulator fixing the stator inside the motor housing;
a coil wound around the stator; and
a magnet mounted on each of opposite side surfaces of the rotor.
3 . The vibration motor of claim 2 , wherein the stator and the insulator are integrally formed by insert injection molding.
4 . The vibration motor of claim 1 , wherein the rotor has the predetermined length, and comprises:
a shaft having the through hole formed therethrough and having a front end coupled to the nozzle, a central portion located inside the motor housing, and a rear end exposed to an outside of the motor housing;
a mounting groove formed at each of opposite sides of the central portion of the shaft to allow the magnet of the vibrating part to be mounted therein;
an insertion hole formed at the front end of the shaft to allow the nozzle to be coupled thereto; and
a fixing groove formed on an outer peripheral surface of the shaft behind the insertion hole to allow the nozzle to be coupled thereto.
5 . The vibration motor of claim 1 , wherein the nozzle comprises:
a coupling body coupled to the rotor to accommodate the rotor;
a nozzle tip formed at a front end of the coupling body;
an elastic piece having elasticity and formed at each of upper and lower portions of the coupling body;
a fixing protrusion protruding inward and fixing the coupling body to the rotor; and
an insertion protrusion formed at an inner boundary between the coupling body and the nozzle tip and coupled to a front end of the rotor, and
the nozzle further comprises: a stopper protruding at an front end of the elastic piece.
6 . The vibration motor of claim 1 , wherein the coupling part comprises:
a coupling ring coupled to a coupling body of the nozzle and pressing an elastic piece against the rotor;
a plurality of protrusions formed on an outer peripheral surface of the coupling ring to be easily operable by a user; and
a catching step formed on an inner surface of a front end of the coupling ring and caught by a stopper of the nozzle.
7 . The vibration motor of claim 1 , wherein one bearing is mounted inside the motor housing and rotates the rotor, and the remaining bearing is mounted inside the rear cover and rotates the rotor.
8 . The vibration motor of claim 1 , wherein the front cover is fixed to a front end of the motor housing by ultrasonic fusion or insert molding, and the rear cover comprises a fixing piece formed at each of upper and lower portions thereof to be coupled to the coupling hole formed at a rear end of the motor housing.