Seat reclining apparatus

摘要

A seat reclining apparatus includes a base plate, a ratchet plate, a lock member supported on a surface of the base plate which faces the ratchet plate so that the lock member is movable between engaged and disengaged positions, a rotational cam positioned between the base plate and the ratchet plate and rotates relative thereto by an operation of an operating member, and a welding protrusion which protrudes from the outer side of the base plate and is engaged with a holding portion. The welding protrusion includes a welding portion which is positioned closer to an outer peripheral side of the base plate than the outer toothed portion of the lock member in the engaged position, and a weld is applied so as to extend over the welding portion and an outer edge of the holding portion.

主权项

1. A seat reclining apparatus comprising:
a base plate, an outer side of which faces one of a seat cushion side frame and a seatback side frame; a ratchet plate which includes an internal gear, said ratchet plate being fixed to the other of said seat cushion side frame and said seatback side frame so as to face said base plate while being rotatable relative thereto; a lock member supported on a surface of said base plate which faces said ratchet plate so that said lock member is movable between an engaged position in which an outer toothed portion formed on an outer peripheral surface of said lock member is engaged with said internal gear of said ratchet plate and a disengaged position in which said outer toothed portion is disengaged from said internal gear of said ratchet plate toward an inner peripheral side; a rotational cam which is positioned between said base plate and said ratchet plate and rotates relative to said base plate and said ratchet plate in association with an operation of an operating member between a locked position to position said lock member in said engaged position and an unlocked position to position said lock member in said disengaged position; a welding protrusion which protrudes from said outer side of said base plate and is engaged with a holding portion, which is formed as one of a through-hole and a bottomed hole in said one of said seat cushion side frame and said seatback side frame; and a protrusion-corresponding recess formed in said surface of said base plate at a position corresponding to a position of said welding protrusion, and which faces said ratchet plate, wherein said outer toothed portion of said lock member, at said engaged position, is positioned radially inside an outer peripheral surface of said protrusion-corresponding recess, wherein said outer peripheral surface is closest to the periphery of said base plate, wherein said welding protrusion includes a welding portion, at an outer edge of said welding protrusion, which is offset from said outer toothed portion so as to be positioned radially closer to an outer peripheral edge of said base plate than said outer toothed portion of said lock member in said engaged position, and wherein a weld is applied so as to extend over said welding portion and an outer edge of said holding portion.