| 摘要 |
Provided is an orbital sander to cool a spindle bearing. The orbital sander to cool the spindle bearing comprises: a rotor rotated by electricity and air pressure; a shaft connected to the rotor, performing a rotational motion; a shaft balancer orbitally equipped with a bearing accommodating unit as much as a constant size with the central axis of the shaft; a spindle performing a rotational motion, received from a rotational force of the shaft; the spindle bearing accommodating the spindle inside and located in the bearing accommodating unit; a back-up pad connected to a lower portion of the spindle; and the orbital sander including sandpaper attached to a lower portion of the back-up pad, comprising at least one cooling hole formed on a side of the shaft balancer. As a portion of the cooling hole is connected to the bearing accommodating unit, external air from the cooling hole is contacted with the spindle bearing arranged inside the bearing accommodating unit. |
