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    • 8. 发明专利
    • BRAKE OF CAR
    • JPH04248360A
    • 1992-09-03
    • JP2049391
    • 1991-01-21
    • MAZDA MOTOR
    • MATSUMURA YASUHIKONADA KAZUAKISHIBATA MINEHARU
    • B60T8/56F16D66/00H01L41/22H02K49/00
    • PURPOSE:To keep the braking force always appropriate by correcting the control value of braking force of a piezoelectric element in response to the temperature detected by temperature detecting means for detecting the temperature of the piezoelectric element in a brake for automobile using a piezoelectric element as a driving source for braking force adjustment. CONSTITUTION:A control valve 26 is an electromagnetic transfer valve having two ports and two positions; in close state, a flow only from brake liquid pressure adjusting means 27 to a master cylinder is permitted by a check valve 29; and in open state, the upstream pressure P1 and downstream pressure P2 of the control valve 26 are made equal. In the braking liquid pressure adjusting means 27, a liquid chamber 62 with variable volume is formed by a piston 35 within cylinder 61, and a piezoelectric element 36 is installed on the opposite side. When the temperature of a piezoelectric element 36 is detected and its voltage is applied to the piezoelectric element 36, then the piezoelectric element 36 is mechanically displaced and compresses the liquid chamber 62. In this way, even though the quantity of operation of brake pedal is the same, the liquid pressure in the liquid chamber 62, that is, the secondary liquid pressure P2 is changed and the braking force is adjusted.