Power tool
AssigneeMakita Corporation
InventorYasuhito KAWAI
Life of this patent
Estimating the term…
Abstract
A power tool, such as an impact driver, includes a motor having a rotor that rotates relative to a stator, and a centrifugal fan that rotates together with the rotor. A motor housing and a rear housing house the motor. Overlapping parts of the motor housing and the rear housing radially surround an outer circumference of the centrifugal fan. Air exhaust ports are defined in each of the overlapping parts and are offset in an axial direction of the rotor. Fluid communication paths are defined between the air exhaust ports in the overlapping parts. The fluid communication paths have an opening area or width in the axial direction that is smaller than an opening area or width in the axial direction of the air exhaust ports.
Claims20
A power tool comprising:
- a motor comprising a stator, a rotor that is rotatable relative to the stator, and a fan that rotates integrally with the rotor;
- a first housing made of a polymer material and having a first portion;
- and
- a second housing made of a polymer material and having a second portion;
- wherein:
- the first and second housings are joined and together house the motor;
- the first portion overlaps the second portion in a direction perpendicular to a rotational axis of the rotor;
- the first portion and the second portion radially surround an outer circumference of the fan;
- first air exhaust ports are defined in the first portion;
- second air exhaust ports are defined in the second portion;
- and
- the first air exhaust ports are offset from the second air exhaust ports.
Dependencies are inferred from the claim text.