Protected nut for tightening master-cylinder on braking amplifier of e.g. brake system of motor vehicle, has cap provided with cavity extended along threaded pin to form closed volume, where cavity is fixed permanently on locking nut part

摘要

The protected nut (21) has an emerging locking nut part (24) whose outer side has a hexagonal cross section (6) to allow screwing on a threaded pin (2) for tightening a clamping piece (4). A cap (22) is placed on a rear side of the protected nut, and is provided with a cavity extended along the threaded pin to form a closed volume, where the cavity is fixed permanently on the locking nut part. The cap is formed in tubular shape, and is equipped with a thin wall having constant thickness. An annular outer boss is placed at a front end of the cap. Independent claims are also included for the following: (1) a locking device (2) a brake system for a motor vehicle (3) a motor vehicle.