US Patent No. 9,510,488

MOTOR DRIVE UNIT WITH HEAT SINK DEALING WITH DROP OF CUTTING FLUID


Patent No. 9,510,488
Issue Date November 29, 2016
Title Motor Drive Unit With Heat Sink Dealing With Drop Of Cutting Fluid
Inventorship Kenichi Okuaki, Minamitsuru-gun (JP)
Assignee FANUC Corporation, Minamitsuru-gun, Yamanashi (JP)

Claim of US Patent No. 9,510,488

1. A motor drive unit comprising:
a housing;
at least one electronic component disposed within the housing;
a heat sink mounted to a mounting surface of the electronic component; and
a fan motor for generating forced convection inside the housing,
wherein the heat sink comprises
a first end intersecting the mounting surface of the electronic component and inclined in a direction relative to a direction
perpendicular to the mounting surface,

a second end adjacent to the first end and opposite the mounting surface, the second end not directly facing the mounting
surface, and

a vertex defined between the first end and the second end of the heat sink, the vertex provided so as to prevent a cutting
fluid dropping from the heat sink from falling onto another electronic component located below the heat sink, and

wherein the convection generated by the fan motor is forced into the heat sink from the inclined first end of the heat sink
toward the fan motor.