Core assembly for coil units and method for producing the same

• US 5,973,583 A
• Filed: 02/25/1998
• Issued: 10/26/1999
• Est. Priority Date: 03/07/1997
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Inventors: Watanabe, Kunihiko, Shimada, Toshiro
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): MAI, ANH T
• Application Number:
  US09/030,667
• Time in Patent Office: 608 Days
• Field of Search: 320/108, 336/DIG. 2, 336/131, 336/132, 336/83, 336/82, 336/59, 336/60, 336/212
• US Class Current: 336/131
• CPC Class Codes: H01F 27/08 Cooling heat-transfer elements F28F; Ventilating structural details of casings H01F27/02
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10

Abstract

A core assembly for coil units and a method for producing the same which can suppress a raise of temperature are provided. A secondary core (21) made of a ferrite includes a pair of core members (25, 25) which are symmetrical with respect to each other and are adapted to be coupled to each other. Each core member (25) is provided in its coupling surface (44) with a groove or apertune (43). When the core members (25, 25) are coupled to each other, the integrated grooves (43, 43) define a flow path (40) adapted to flow a cooling medium in the secondary core (21). Thus, it is possible to form a flow path in a core made of a sintered material which is too hard to be worked.

Claims

1. A core assembly for coil units which charges a battery device in an electric car by means of an external charging power source, said coil units including a primary coil unit connected to said external charging power source and a secondary coil units connected to said battery device, comprising:

a primary core for supporting a primary coil in said primary coil unit, said primary core having a pair of complementary primary core members, at least one of said complementary primary core members being provided in a coupling surface with a aperture to form a first flow path adapted to flow a cooling medium in said primary core when said primary core members are coupled to each other; and

a secondary core for supporting a secondary coil in said secondary coil unit, said secondary core having a pair of complementary secondary core members, at least one of said complementary secondary core members being provided in the coupling surface with a aperture to form a second flow path adapted to flow a cooling medium in said secondary core when said secondary core members are coupled to each other;

whereby said coil units form a magnetic circuit between said primary coil and said secondary coil when said primary core is connected to said secondary core.

2. A core assembly for coil units according to claim 1 wherein said first and second flow paths are provided on the interiors with recesses and projections for causing a turbulent flow of said cooling media therein.

3. A core assembly for coil units according to claim 2 wherein said primary or secondary coil unit is accommodated in a protection casing and wherein said protection casing is provided with communication holes adapted to communicate said flow paths with an exterior of said protection casing.

4. A core assembly for coil units according to claim 1, wherein said primary or secondary coil unit is accommodated in a protection casing and wherein said protection casing is provided with communication holes adapted to communicate said flow paths with an exterior of said protection casing.