| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide the daily use- and parking brake unit that can avoid the lowering of the parking brake force along with the depressurization. <P>SOLUTION: When the brake liquid is pressured and supplied to a liquid pressure room R1 and a control liquid room R4, a piston 19 goes forward without revolving and a movable body 27 goes back while it is revolving. Thereby, a brake lining 13a brakes a disk rotor 11 and a friction clutch FC between a cylinder 17a and the movable body 27 is in an engaged condition and regulates the revolution of the movable body 27, and the cylinder axial movement of the piston 19 connected through the movable body 27 and a compound screw part 27a, 25a. Under this condition, the retreat side screw face of the piston side screw part 25a and the forward side screw face of the movable body screw part 27a are connected and engaged, and the movable body 27 is in a stretched condition between the friction clutch FC and the connected and engaged part of the compound screw screw face. Because of this, the stretched condition of the above movable body 27 is unchanged even if the liquid pressure in the unit A1 is depressurized and the piston 19 is pushed back by the reactive force. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
