Hitachi Automotive Systems, Ltd.

Yasuro Kameshiro

Masaru Kamoshida

Yoshinori Wakana

Takashi Hattori

Takashi Igarashi

The invention provides an electronic control device having a high-grade heat sink that: does not require tight control at the time of manufacturing; does not restrict the range of electronic components that can be used; is structurally simple; can be produced at a higher production rate; and is cost-effective. In this device, when a circuit boardhaving an electronic componentthereon is placed in a non-metal (resin) housing having: a housing baseintegrally comprising via a partition walla connector inserting sectionused for electrical connection with an external mating connector (not illustrated); and a housing coverattached to the housing base, part of the boardis inserted into an insertion hole provided in the partition wallso that it is exposed inside the connector inserting section. A pair of elastic metal parts, a heat sink, is provided in the housing, connected to the circuit boardat particular positions on its top and bottom surfaces with the use of a connecting material(solder or adhesive), and has an arch-shaped cross section as viewed from a lateral direction. The heat of the componentis transferred to the housing to dissipate it to the outside by the boardbeing supported from the top and bottom sides in the housing.

Electronic control device

The invention provides an electronic control device having a high-grade heat sink that: does not require tight control at the time of manufacturing; is structurally simple; can be produced at a higher production rate; and is cost-effective. In this device, when a circuit boardhaving an electronic componentthereon is placed in a non-metal (resin) housing having: a housing baseintegrally comprising via a partition wall lie a connector inserting sectionused for electrical connection with an external mating connector (not illustrated); and a housing coverattached to the housing base, part of the boardis inserted into an insertion hole provided in the partition wall lie so that it is exposed inside the connector inserting section. When a convex-shaped metal part, used as a heat sink, having a flangeon the bottom side is attached from an opening provided in the housing base, the top section of the metal partcomes into contact with mounting position of the electronic componenton the boardvia a heat dissipating filler material, and the flangeand the wall section near the opening are brought into contact with each other via a sealing filler material

Provided is an electronic control device which has a circuit board fixing structure with a simple configuration and suppresses a phenomenon of falling off of the circuit board from a case body by mechanical external force. An elastically deformable engaging part and an engaged part for complementarily engaging with this engagement part are provided on a circuit board or a case body. When the circuit board is slid and housed in a guide rail part formed inside the case body, the engaging part is deformed. When the circuit board reaches a predetermined position, the engaging part is engaged with the engaged part formed at the circuit board or the case body. With this configuration, the case body and the circuit board can be reliably fixed with a simple configuration.

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Hitachinaka, Japan

Yasuro Kameshiro