US Patent No. 9,297,273

COOLING JACKET INCLUDING A GROOVE UNIT THROUGH WHICH COOLING MEDIUM PASSES, STATOR INCLUDING A COOLING JACKET, AND ROTARY ELECTRIC MACHINE INCLUDING A COOLING JACKET


Patent No. 9,297,273
Issue Date March 29, 2016
Title Cooling Jacket Including A Groove Unit Through Which Cooling Medium Passes, Stator Including A Cooling Jacket, And Rotary Electric Machine Including A Cooling Jacket
Inventorship Yohei Arimatsu, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,297,273

1. A cooling jacket on a radial outside of a stator of a rotary electric machine, the cooling jacket comprising:
a tubular main body including a first end face of one axial side and a second end face of the other axial side; and
a groove unit defining a flow channel of a cooling medium, the groove unit being successively disposed axially on an outer
periphery of the main body,

wherein the cooling jacket includes no portion located radially outward from a bottom of the groove unit between a first end
portion of the groove unit on the one axial side of the main body and the first end face of the main body and between a second
end portion of the groove unit on the other axial side of the main body and the second end face of the main body,

wherein the groove unit is a multi-thread groove successively extended axially on the main body in a spiral manner.