Power tool
AssigneeJohnson Electric S.A.
InventorJames Ching Sik Lau
Life of this patent
Estimating the term…
Abstract
A power tool has a casing and a motor assembly installed in the casing. The motor assembly comprises a motor and a heat dissipation device. The motor comprises a housing and magnets or windings disposed at an inner surface of the housing. The heat dissipation device is arranged at an outer surface of the housing and a window is formed in the casing to expose the heat dissipation device. Preferably, the heat dissipation device comprises an annular heat absorbing section fitted to a radially outer surface of the motor housing and a plurality of fins extending from the heat absorbing section and into the window.
Claims10
A power tool comprising a casing and a motor assembly installed in the casing,
- the motor assembly comprising a motor and a heat dissipation device,
- the motor comprising a housing and magnets or windings disposed at an inner surface of the housing,
- wherein the heat dissipation device comprises a heat absorbing section that is fixed to the outer surface of the housing and a plurality of fins extending from the heat absorbing section, and a window is formed in the casing to expose the heat dissipation device, the fins extend to the outside of the casing through the window.
A power tool comprising:
- a casing comprising a window and an air inlet;
- a motor assembly installed in the casing and comprising:
- a motor comprising a housing and magnets or windings disposed at an inner surface of the housing;
- a heat dissipation device comprising a heat absorbing section that is fixed to an outer surface of the housing and a plurality of fins extending from the heat absorbing section, the fins being exposed in the window;
- and
- a centrifugal fan comprising an outlet that is surrounded by portions of the fins that extend axially from the heat absorbing section, airflow generated by the fan entering into the casing through the air inlet and flowing out of the casing through the window where the fins are exposed.
Dependencies are inferred from the claim text.