Seat reclining device and seat device

摘要

A memory mechanism is provided with engagement portions, a housing recess, a memory plate, and engagement receiving portions. The engagement portions are provided to an adjacent pair of pawls, respectively. The housing recess has a cylindrical shape and is provided to a first member. The memory plate is formed in an annular shape which is cut at one point. The memory plate is housed within the housing recess while being reduced in diameter with the cut portion disposed between the engagement portions. The engagement receiving portions are respectively adjacent between the engagement portions of the memory plate, to the engagement portions. The engagement portions are engaged with and disengaged from the engagement receiving portions as the pawls move in the radial direction.

主权项

1. A seat reclining device comprising a locking mechanism and a memory mechanism, wherein
the locking mechanism switches a seat back between a locked state, in which the seat back is restricted from tilting relative to a seat cushion, and an unlocked state, in which the seat back is allowed to tilt, in accordance with a rotating movement of an operation shaft, the memory mechanism stores an angular position of the seat back where it is located immediately before being unlocked, the seat back, once unlocked, is locked only when it is tilted to the angular position that has been remembered, the locking mechanism includes a first member, a second member, and a plurality of locking members, the first member is attached to one of the seat cushion and the seat back and has an internal gear around the operation shaft, the second member is attached to the other one of the seat cushion and the seat back and rotational around the operation shaft relative to the first member, the locking members are each attached to the second member and have external teeth facing the internal gear, the seat back is locked when the locking members are each pressed radially outward so that the external teeth mesh with the internal gear, the seat back is unlocked when the operation shaft is rotated thereby to move each of the locking members radially inward so that the external teeth disengage from the internal gear, the memory mechanism includes an engagement portion, a housing recess, a memory plate, and a pair of engagement receiving portions, the engagement portion is provided to an adjacent pair of the plurality of locking members, the housing recess is formed in a cylindrical shape in the first member, the memory plate is formed in an annular shape that is cut at one point, the memory plate is housed in the housing recess while being reduced in diameter with the cut portion being located between the engagement portions, each of the pair of engagement receiving portions is provided to the memory plate and adjacent to and between the engagement portions, the engagement portions engage with and disengage from the engagement receiving portions as the locking members move in the radial direction, and the unlocked state includes: an unlocked state in which the engagement receiving portions are pressed circumferentially with the engagement portions half engaged with the engagement receiving portions and the memory plate rotates together with the locking members relative to the housing recess, so that the seat back is allowed to tilt without the angular position being remembered; and an unlocked state in which the engagement portion rides over the engagement receiving portion and slides on an inner circumferential surface of the engagement receiving portion with the memory plate being made irrotational relative to the housing recess, so that the seat back is allowed to tilt with the angular position being stored, in the unlocked state in which the seat back is allowed to tilt without remembering the angular position, when the seat back is tilted forward, one of the engagement portions presses its adjacent engagement receiving portion circumferentially so that a space of the cut portion of the memory plate is reduced with the engagement portions half engaged with the engagement receiving portions, and when the seat back is tilted backward, the other of the engagement portions presses its adjacent engagement receiving portion circumferentially so that the space of the cut portion of the memory plate is reduced with the engagement portions half engaged with the engagement receiving portions.