JP2009127737A5 - - Google Patents

Claims (7)

A pad pressing member that presses the brake pad, an electric motor, a planetary speed reduction mechanism that decelerates the rotation of the electric motor, and a rotation-direct transmission that converts the rotation of the planetary speed reduction mechanism into a linear motion and transmits it to the pad pressing member. In an electric disc brake comprising a caliper provided on a caliper body with a dynamic conversion mechanism, propelling the pad pressing member in accordance with rotation of the electric motor, and pressing the brake pad against a disc rotor to generate a braking force the planetary reduction mechanism comprises a rotary shaft which is rotated by the electric motor, and a pair of reduced rotation member which rotates opposite to each other in response to rotation of the rotary shaft, one of the pair of reduced rotation member decelerated rotation member wherein the rotation of the - to the rotating member of the linear motion converting mechanism, other reduced rotation member of the pair of decelerating the rotating member to each of the caliper body communicating Is, the between the pair of decelerated rotation member, the electric disc brake torsion spring store torque in accordance with the relative rotation of both said deceleration rotary member is characterized in that it is interposed. The electric disk brake according to claim 1, wherein the rotation-linear motion conversion mechanism is a ball screw mechanism. The electric disc brake according to claim 1 or 2, wherein the torsion spring is given a set torque. The planetary reduction mechanism is a planetary gear reduction mechanism, and the planetary gear reduction mechanism is rotatably fitted to and supported by the eccentric portion of the rotating shaft, and has a first external gear and a second external gear on the outer periphery. An external gear member, a first internal gear that is provided in the one reduction rotation member and meshes with the first external gear, and a second reduction rotation member that is provided in the other reduction rotation member. The electric disc brake according to any one of claims 1 to 3, further comprising a meshing second internal gear. Between the other decelerated rotation member and the caliper body of the planetary reduction mechanism, the braking force until the generated permit rotation of said other reduced rotation member, since the braking force is generated decelerated rotation of the other The electric disc brake according to any one of claims 1 to 4, further comprising a clutch that restricts rotation of the member . The said clutch consists of a friction clutch, The clutch surface provided in the said other deceleration rotation member and the clutch surface integrally provided in the said caliper main body are friction-contacted, The Claim 6 characterized by the above-mentioned. Electric disc brake. Claims between the caliper body and the other reduced rotation member relative to the other decelerated rotation member, characterized in that the rotation resistance means is interposed to impart rotational resistance larger than a set torque of the torsion spring Item 7. The electric disc brake according to Item 6.