Reclining device
AssigneeDelta Kogyo Co., Ltd.
InventorHiroki OSHIMO
Life of this patent
Estimating the term…
Abstract
A reclining device includes a guide bracket, an internal gear, a plurality of lock gears, and a rotation cam. At least one of the lock gears has at least one gear bulge. The gear bulge has at least one portion forming an arc to protrude toward a cam face of the rotation cam. The arc has a center located at: an intersection of a first imaginary line extending in a direction in which a resultant force including a radially inward force from the internal gear in a locking state and a second imaginary line extending in a direction in which a load to enter the lock gear from the rotation cam through the gear bulge and acts; or a position between the intersection and the gear bulge on the second imaginary line.
Claims7
A reclining device for a seat, comprising:
- a guide bracket configured to be fixedly attached to one of a seat cushion and a seatback;
- an internal gear configured to be fixedly attached to the other of the seat cushion and the seatback in such a manner as to be rotatable relative to the guide bracket, the internal gear having internal teeth on an inner circumferential surface thereof;
- a plurality of lock gears each located on a radially inside of the internal gear movably in a radial direction of the internal gear, and having an external tooth configured to mesh with an associated internal tooth among the internal teeth;
- and
- a rotation cam located on the radially inside relative to the lock gears rotatably about a radial center of the internal gear and having a cam face to come into contact with at least a surface section of an inner circumferential surface being a radially inward surface of each of the lock gears, the rotation cam being configured to switch between a locking state where the internal tooth and the external tooth mesh and an unlocking state where the meshing of the internal tooth and the external tooth is released depending on a pushing state from the cam face to the surface section, wherein
- the guide bracket has a guide wall that guides corresponding one of the lock gears to move in the radial direction,
- at least one of the lock gears has at least one gear bulge in a region of the surface section of the inner circumferential surface that faces the cam face of the rotation cam, at least a portion of the gear bulge forming an arc to protrude toward the cam face, and
- the gear bulge is in such a form that the arc of the gear bulge has a center located at:
- an intersection of a first imaginary line extending in a direction in which a resultant force including a radially inward force from the internal gear in the locking state acts and a second imaginary line extending in a direction in which a load to enter the lock gear from the rotation cam through the gear bulge acts;
- or a position between the intersection and the gear bulge on the second imaginary line.
Dependencies are inferred from the claim text.