Pretensioner, retractor, and seat belt device
View Patent ↗Provided are a pretensioner, a retractor, and a seat belt device in which strength and slidability of a rod-shaped power transmission member may both be achieved. A pretensioner includes a ring gear on which the spool is rotatably disposed, and power transmission units for transmitting power to the ring gear in an emergency. The power transmission units includes a rod-shaped power transmission member for transmitting power to the ring gear while being plastically deformed, a tip reinforcing member disposed on a tip side of the power transmission member, a pipe for containing the power transmission member, and a gas generator disposed at an end of the pipe. The tip reinforcing member has higher strength than the power transmission member.
1. A pretensioner comprising:
a ring gear to which a spool is rotatably disposed, the spool winding a webbing for restraining an occupant; and
power transmission units for transmitting power to the ring gear in an emergency, wherein
the power transmission units each comprise a rod-shaped power transmission member for transmitting power to the ring gear while being plastically deformed, a tip reinforcing member disposed on a tip side of the power transmission member, a pipe for containing the power transmission member, and a gas generator disposed at an end of the pipe,
the tip reinforcing member has higher strength than the power transmission member, and,
the tip reinforcing member is formed such that a length with respect to an axial direction of the power transmission member is smaller than a pitch of the ring gear.
2. The pretensioner according to claim 1 , wherein the tip reinforcing member is fixed to the power transmission member, pressed into the pipe, molded in the power transmission member, or made by hardening a part of the power transmission member.
3. The pretensioner according to claim 1 , wherein the tip reinforcing member has higher strength than the ring gear.
4. A retractor comprising:
a spool for winding a webbing that restrains an occupant; and
a pretensioner for winding the webbing and eliminating slack in an emergency, wherein
the pretensioner comprising a ring gear to which a spool is rotatably disposed; and
power transmission units for transmitting power to the ring gear in an emergency, wherein
the power transmission units each comprise a rod-shaped power transmission member for transmitting power to the ring gear while being plastically deformed, a tip reinforcing member disposed on a tip side of the power transmission member, a pipe for containing the power transmission member, and a gas generator disposed at an end of the pipe,
the tip reinforcing member is formed such that a length with respect to an axial direction of the power transmission member is smaller than a pitch of the ring gear.
5. The retractor according to claim 4 , wherein the tip reinforcing member is fixed to the power transmission member, pressing into the pipe, molded in the power transmission member, or made by hardening a part of the power transmission member.
6. The retractor according to claim 4 , wherein the tip reinforcing member has higher strength than the ring gear.
7. A seat belt device comprising:
a webbing for restraining an occupant;
a retractor for winding the webbing;
a belt anchor for fixing the webbing on a vehicle body side;
a buckle disposed on a side surface of the seat; and
a tongue disposed in the webbing, wherein
the retractor comprising a spool for winding the webbing; and
a pretensioner for winding the webbing and eliminating slack in an emergency, wherein
the pretensioner comprising a ring gear to which a spool is rotatably disposed; and
power transmission units for transmitting power to the ring gear in an emergency, wherein
the power transmission units each comprise a rod-shaped power transmission member for transmitting power to the ring gear while being plastically deformed, a tip reinforcing member disposed on a tip side of the power transmission member, a pipe for containing the power transmission member, and a gas generator disposed at an end of the pipe,
the tip reinforcing member has higher strength than the power transmission member, and
the tip reinforcing member is formed such that a length with respect to an axial direction of the power transmission member is smaller than a pitch of the ring gear.
8. The seat belt device according to claim 7 , wherein the tip reinforcing member is fixed to the power transmission member, pressed into the pipe, molded in the power transmission member, or made by hardening a part of the power transmission member.
9. The seat belt device according to claim 7 , wherein the tip reinforcing member has higher strength than the ring gear.