Brake device for motor vehicle seat

A brake device for a motor vehicle seat, comprising:

• a brake assembly including a housing, a pinion shaft, a braking component, and a drive wheel that are self-held in an assembled state by mechanical interaction thereamong;
• a tooth assembly including a holder plate and a tooth plate that are self-held in an assembled state by mechanical interaction therebetween;
• and
• a lever assembly including an input lever, a cover, a coil spring, and a lever bracket that are self-held in an assembled state by mechanical interaction thereamong, wherein the brake assembly, the tooth assembly, and the lever assembly are arranged and assembled together in an axial direction;
• wherein:
• the brake assembly resists an external torque inputted through the pinion shaft;
• the tooth assembly and the lever assembly operate the pinion shaft;
• the pinion shaft extends through the drive wheel, the holder plate, and the input lever, and is supported rotatably with respect to the holder plate and the input lever;
• the braking component and the drive wheel are mounted in the housing;
• the drive wheel is arranged to rotate along with the pinion shaft, and includes an internal tooth part;
• the holder plate frictionally resists rotation of the drive wheel, and includes a first support part and a first holding part, the first holding part preventing the tooth plate from being released from the first support part;
• the tooth plate is rotatably supported by the first support part of the holder plate, and includes a pair of external tooth parts each of which engages with the internal tooth part of the drive wheel;
• the input lever includes a second support part that engages with the tooth plate, wherein the second support part is offset from the first support part of the holder plate;
• the cover is coupled with the housing, thereby containing the holder plate, the tooth plate, and the input lever;
• the coil spring biases the input lever toward a neutral position;
• the lever bracket is disposed outside the cover, and coupled with the input lever;
• the holder plate comprises a leaf spring;
• the holder plate further includes:
• a second holding part that prevents the tooth plate from being released from the first support part, wherein the first and second holding parts each extend along a first surface of the tooth plate facing the input lever;
• and
• an arm extending along a second surface of the tooth plate opposite to the first surface;
• and
• the tooth plate is interposed and supported between the arm and the first and second holding parts.