JP2014092165A5

JP2014092165A5 -

Info

Publication number: JP2014092165A5
Application number: JP2012240810A
Authority: JP
Filing date: 2012-10-31
Publication date: 2015-09-24
Anticipated expiration: 2032-10-31

Description

上記課題を解決するための手段として、本発明は、ロータを挟んでロータの軸方向両側に配置される一対のパッドのうち一方をディスクに押し付けるピストンと、該ピストンが軸方向に移動可能に収容され、内部に液圧室が設けられるシリンダを有するキャリパ本体と、該キャリパ本体に設けられる電動モータと、前記キャリパ本体に設けられ、前記電動モータの回転によって待機位置と制動位置との間で前記ピストンを移動させ、前記制動位置に移動した前記ピストンを保持するパーキングブレーキ機構と、を備え、該パーキングブレーキ機構は、前記電動モータの回転を直動に変換して前記ピストンを移動させる少なくとも２つの回転直動変換機構を有し、該２つの回転直動変換機構のうちの一方はねじ機構であって、該ねじ機構には、前記ピストンを制動位置から待機位置の方向に戻すときの回転を抑制するクラッチ機構が設けられ、該クラッチ機構は、前記ピストンの内部に回転不能に配置されるスリーブ部材と、前記ねじ機構に係合する係合部及び該係合部から前記ピストンの径方向に延出して前記スリーブ部材に係合される回り止め部を有するクラッチスプリングと、を備える。 As a means for solving the above problems, the present invention provides a piston to press the one of the pair of pads disposed on both axial sides of the rotor across the rotor disc, movably accommodated the piston in the axial direction A caliper body having a cylinder in which a hydraulic chamber is provided, an electric motor provided in the caliper body, and the caliper body provided between the standby position and the braking position by rotation of the electric motor. A parking brake mechanism that moves the piston and holds the piston that has moved to the braking position, and the parking brake mechanism converts at least two of the electric motors to linear motion to move the piston . has a mechanism for converting rotary motion into linear motion, one of the two rotational-linear motion conversion mechanism is a screw mechanism, the said screw mechanism, Serial piston is suppressing the clutch mechanism rotating when returning from the braking position in the direction of the standby position is provided, the clutch mechanism includes a sleeve member which is non-rotatably disposed within the piston, engages the screw mechanism And a clutch spring having a detent portion extending from the engagement portion in the radial direction of the piston and engaged with the sleeve member .

Claims

A piston for pressing the one of a pair of pads disposed on both axial sides of the rotor across the rotor disc,
A caliper body having a cylinder in which the piston is movably accommodated in the axial direction and in which a hydraulic chamber is provided;
An electric motor provided in the caliper body;
A parking brake mechanism that is provided in the caliper body, moves the piston between a standby position and a braking position by rotation of the electric motor, and holds the piston that has moved to the braking position;
The parking brake mechanism has at least two rotation / linear motion conversion mechanisms that convert the rotation of the electric motor into linear motion and move the piston.
One of the two rotation / linear motion conversion mechanisms is a screw mechanism, and the screw mechanism is provided with a clutch mechanism for suppressing rotation when the piston is returned from the braking position to the standby position.
The clutch mechanism includes a sleeve member disposed in a non-rotatable manner inside the piston,
A clutch spring having a detent portion which is engaged with the sleeve member extending in a radial direction of the piston from the engagement portion and the engagement portion engages the screw mechanism, Ru comprises a disc brake.

The disc brake according to claim 1, wherein the other of the two rotation / linear motion conversion mechanisms is a ball and ramp mechanism.

The sleeve member has a longitudinal groove extending in the axial direction on a peripheral wall thereof,
The detent portion of the clutch spring in which grooves are engaged, the disk brake according to claim 1 or 2.

The sleeve member is movable inside the axial direction of the piston, disc brake according to any one of claims 1 to 3.