PROBLEM TO BE SOLVED: To provide a vehicle drum brake system capable of preventing the degradation of drag performance of a brake.SOLUTION: A vehicle drum brake system comprises: a pair of pistons accommodated in a wheel cylinder to be able to move forward and backward, one of the pistons facing an open end of a shoe on one direction side of a vehicle, and the other piston facing an open end of a shoe on the other direction side of the vehicle; a parking lever pivotally supported by an open end portion of the shoe on the other direction side of the vehicle; a brake strut provided between a base portion of the parking lever and the open end portion of the shoe on one direction side of the vehicle, having one end coupled to the base portion of the parking lever, and having the other end coupled to the open end portion of the shoe on one direction side of the vehicle; a foot brake pedal supplying a brake fluid to the wheel cylinder and braking a drum; and a brake shoe adjustment device rocking the parking lever in an actuation direction before vehicle runs, slidably moving slide surfaces of the shoe on one direction side of the vehicle and the shoe on the other direction of the vehicle on an inner circumferential surface of the drum (step S5), rocking the parking lever in an opposite direction to the actuation direction right after vehicle starts running, and separating the shoe on one direction side of the vehicle from the inner circumferential surface (step S7).SELECTED DRAWING: Figure 9
【課題】ブレーキの引きずり悪化を防止できる自動車のドラムブレーキ装置を提供する。【解決手段】ホイールシリンダに対して進退可能に収容され、一方が車両一方向側シューの開放端と対向し、他方が車両他方向側シューの開放端と対向する一対のピストンと、車両他方向側シューの開放端部に軸支されたパーキングレバーと、パーキングレバーの基部と車両一方向側シューの開放端部との間に設けられ、一端がパーキングレバーの基部に連結され、他端が車両一方向側シューの開放端部に連結されたブレーキストラッドと、ホイールシリンダにブレーキフルードを供給し、ドラムを制動させるフットブレーキペダルと、走行前にパーキングレバーを作動方向に揺動させて、車両一方向側シューと車両他方向側シューの摺動面をドラムの内周面に摺動させ(ステップS5)、走行開始直後にパーキングレバーを作動方向と反対方向に揺動させて、車両一方側シューをドラムの内周面から離反させる(ステップS7)ブレーキシュー調整装置と、を備える。【選択図】図9
VEHICLE DRUM BRAKE SYSTEM
自動車のドラムブレーキ装置
2016-03-17
Patent
Electronic Resource
Japanese
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