Patent ID: 9205767
Filing Date: 2015-12-08
Classification: B60N

Abstract:
1. A vehicle seat reclining device, comprising: a first bracket adapted to be secured to one of a seat cushion and a seat back, wherein the first bracket includes an annular inner circumferential surface and internal teeth provided on the inner circumferential surface; a plurality of pawls each including external teeth that are engageable with and disengageable from the internal teeth; a second bracket adapted to be secured to the other of the seat cushion and the seat back, wherein the second bracket includes a guide portion that holds the pawls such that the pawls are movable in a radial direction, and the second bracket is capable of adjusting a tilt angle of the seat back relative to the seat cushion according to relative rotation of the second bracket with respect to the first bracket; and a cam mechanism including a cam body arranged radially inward of the pawls, wherein the cam mechanism moves the pawls in the radial direction according to rotation of the cam body to engage and disengage the external teeth of the pawls with and from the internal teeth of the first bracket, wherein among the external teeth of each of the pawls, at least one external tooth including an end tooth located at one circumferential end of the pawl is displaced radially inward with respect to a reference position corresponding to a pitch circle of the internal teeth to move in parallel along a center line that divides the external tooth into two in the circumferential direction without changing the shape of an effective mesh portion with respect to the internal teeth and a pitch circle radius of the external teeth.