Patent FR-2926667-A1 (FR)
Title: Casing for controlling heating of electric circuit of motor vehicle, comprises electromechanical relay, fuse wire, unit for connecting power input of relay to external power supply, and unit for connecting output with two output pins
Inventor: DAVIS BRUCE
IPC: H01H50/02
Filed: 2008-01-23
Abstract: The control casing comprises an electromechanical relay, a fuse wire, a unit for connecting a power input of the relay to an external power supply, and a unit for connecting an output with two output pins. A first end (22a) of the power input and a first connection pin (23a) of power output form a first branch (33a) of circuit, and a second end (22b) of the power input and a second connection pin (23b) of power output form a second branch (33b) of circuit. The electromechanical relay and the fuse wire are connected in series, and electric current is flowed in the circuit. The control casing comprises an electromechanical relay, a fuse wire, a unit for connecting a power input of the relay to an external power supply, and a unit for connecting an output with two output pins. A first end (22a) of the power input and a first connection pin (23a) of power output form a first branch (33a) of circuit, and a second end (22b) of the power input and a second connection pin (23b) of power output form a second branch (33b) of circuit. The electromechanical relay and the fuse wire are connected in series, and electric current is flowed in the circuit comprising the first and second branches. The electromechanical relay is connected in series in the second branch of the circuit between the first end of the input and the first connection pin. The fuse wire is connected in series in the second branch of the circuit between the second end of the input and the second connection pin, and is constituted of an intermediate section having reduced section. The intermediate section with reduced section connecting the two end sections are mechanically fixed to the control casing. The electromechanical relay is mounted on a relay support turntable held on a base of the casing with interposition of anti-vibration dampers. The power input and the pins for output connection are held on the casing base away from the support turntable. The base of the casing is adapted in a bowl having a lifted periphery defining an interior space of the bowl. The support turntable is laid generally parallel to the casing base and placed in space inside the bowl. Flexible conductors are arranged for providing electrical connection between the relay and the unit for input and output connection. A soft polymerized paste such as a silicone gel fills the volume between the relay support turntable and the casing base, and has a good thermal conductivity. The electromechanical relay comprises an armature carrying a magnetic circuit excited by a bobbin, a movable plate supplied on the armature and induced by displacing a part by magnetic attraction and other part by a helicoidal spring mounted between the movable plate and armature, and a flexible shock absorber element axially connected between the armature and a coil of the spring. The helicoidal spring comprises a loop of fixed end engaged around a fixed spur transverse to the armature. The shock absorber element is a bushing engaged around the fixed spur. The bushing comprises a first radial face in axial support on the first coil of the spring, and a second lateral face in lateral support against the end loop of the spring.