Electronic control device
An electronic control device includes a housing provided with a first boss and a second boss, a circuit board, a first heat generating component, a second heat generating component, a plurality of heat dissipation fins, and a fan. A first projection is provided on an inner surface of the housing. One end side of the first projection is arranged in the state of being connected to the second boss, and the other end side of the first projection extends toward a third region.
1 . An electronic control device comprising:
a housing which has an inner surface provided with a plurality of bosses including a first boss and a second boss;
a circuit board which is housed in an internal space of the housing;
a first heat generating component which is mounted on the circuit board and thermally connected to the housing via the first boss;
a second heat generating component which is mounted on the circuit board and thermally connected to the housing via the second boss;
a plurality of heat dissipation fins which are formed on an outer surface of the housing; and
a fan which is mounted on the outer surface of the housing and blows air toward the heat dissipation fin,
wherein a first projection protruding toward the circuit board is provided on the inner surface of the housing, and
when, in the housing, a region immediately above a mounting position of the first heat generating component is defined as a first region, a region immediately above a mounting position of the second heat generating component is defined as a second region, and a region between the first region and the fan in an air blowing direction of the fan is defined as a third region,
one end side of the first projection is arranged in a state of being connected to the second boss, and
another end side of the first projection extends toward the third region so as to transport heat generated by the second heat generating component to the third region.
2 . The electronic control device according to claim 1 , wherein the one end side of the first projection is arranged to be connected to at least two sides of the second boss.
3 . The electronic control device according to claim 1 , wherein
a second projection protruding toward the circuit board is further provided on the inner surface of the housing,
one end side of the second projection is arranged in a state of being connected to the second boss, and
another end side of the second projection extends to a downstream side of the first region in the air blowing direction of the fan.
4 . The electronic control device according to claim 3 , wherein a part of the first projection and a part of the second projection are arranged to be continuous with the second boss interposed therebetween.
5 . The electronic control device according to claim 3 , wherein a distance between a closest point to the fan in the second projection and the fan is longer than a distance between a closest point to the fan in the first projection and the fan.
6 . The electronic control device according to claim 3 , wherein in the air blowing direction of the fan, the first projection and the first boss are arranged at a first interval, and the second projection and the first boss are arranged at a second interval.
7 . The electronic control device according to claim 1 , further comprising a heat transfer member which thermally connects the first projection and the circuit board.
8 . The electronic control device according to claim 1 , wherein among the plurality of heat dissipation fins formed on the outer surface of the housing, a predetermined heat dissipation fin arranged in the air blowing direction of the fan is inclined with respect to the air blowing direction of the fan so as to expand an air blowing region of the fan toward the second region.
9 . The electronic control device according to claim 1 , wherein
the housing is provided with a third projection protruding to a side opposite to the first projection, and
the third projection extends from a vicinity of the second region to a front of the third region.
10 . The electronic control device according to claim 1 , wherein an amount of heat generated by the first heat generating component is larger than an amount of heat generated by the second heat generating component.
11 . The electronic control device according to claim 1 , wherein
a connector for external connection is arranged on one side of the housing, and
the fan is arranged in a vicinity of the connector.
12 . The electronic control device according to claim 1 , wherein the fan is a centrifugal fan or a blower fan.
13 . The electronic control device according to claim 1 , wherein
the first heat generating component and the first boss are connected by a first heat transfer material, and
the second heat generating component and the second boss are connected by a second heat transfer material.
14 . The electronic control device according to claim 1 , wherein among the plurality of heat dissipation fins formed on the outer surface of the housing, a heat dissipation fin arranged in a vicinity of the second region is arranged toward an air blowing region of the fan at an angle different from an angle of a heat dissipation fin arranged on a side of the first region.
15 . The electronic control device according to claim 14 , wherein the heat dissipation fin arranged in the vicinity of the second region is arranged in a direction orthogonal to the air blowing direction of the fan.