Electric circuit breaker device
An electric circuit breaker device includes: a housing including an accommodating space inside; a projectile projected from a projectile accommodating portion toward an arc-extinguishing region portion side by energy received from the igniter; and a conductor piece provided at the housing and forming a portion of an electric circuit, the conductor piece including, at a portion of the conductor piece, a cutoff portion to be cut off by the projectile. The projectile includes, on a distal end side, a cutting-off surface configured to cut off the cutoff portion during actuation of the igniter. Of the conductor piece, at least one of a first surface facing a projectile accommodating portion side or a second surface facing the arc-extinguishing region portion side is formed with a cutting-off assisting groove at a predetermined expected cutting-off position where the cutoff portion is pressingly cut by the cutting-off surface during actuation of the igniter.
1 . An electric circuit breaker device comprising:
a housing including an accommodating space inside, the accommodating space extending in one direction and including a projectile accommodating portion formed at one end side and an arc-extinguishing region portion formed at the other end side;
an igniter provided at the housing;
a projectile accommodated in the projectile accommodating portion and configured to be projected from the projectile accommodating portion toward an arc-extinguishing region portion side along the accommodating space by energy received from the igniter; and
a conductor piece provided at a housing body of the housing and forming a portion of an electric circuit, the conductor piece including, at a portion of the conductor piece, a cutoff portion to be cut off by the projectile, the cutoff portion being disposed crossing between the projectile accommodating portion and the arc-extinguishing region portion, wherein
the projectile includes, on the one end side, a piston portion, and, on the other end side, a tubular cylindrical rod portion extending directly from the piston portion and defining a cutting-off surface configured to cut off the cutoff portion during actuation of the igniter,
the cutting off surface has a circular shape, and
of the conductor piece, at least one of a first surface facing a projectile accommodating portion side or a second surface facing the arc-extinguishing region portion side is formed with a cutting-off assisting groove at a predetermined expected cutting-off position where the cutoff portion is pressingly cut by the cutting-off surface during actuation of the igniter, the cutting-off assisting groove having a circular arc shape conforming to a contour of the cutting-off surface as seen in a moving direction of the projectile,
the cutting-off assisting groove is formed as a V-shaped groove of which a cross-sectional shape along a thickness direction of the conductor piece is V-shaped, and
an outer circumferential edge of the cutting-off surface and an inner circumferential edge of the housing body are provided at positions substantially overlapping a bottom portion of the V-shaped groove in the moving direction of the projectile.
2 . The electric circuit breaker device according to claim 1 , wherein
the cutting-off assisting groove is formed on both a first surface side and a second surface side of the conductor piece.