| 摘要 |
<p>1. A disc brake of the type comprising at least one rotary brake disc (2, 3) ; brake pads (5-8) adapted to be urged against the lateral faces of said disc (2, 3), each of said pads (5-8) comprising a friction lining (14) and a lining support plate (15 or 16) ; a fixed support (9) presenting transverse external arms (12, 13) extending over a circumferential portion of the brake disc (2, 3) and defining between them a central aperture (11) in the fixed support (9) and transverse guiding means (17, 18) for supporting the friction pads (5-8) and guiding their movement parallel to the axis of the brake disc (2, 3) ; a caliper (19), as seen in the sense of forward movement, is mounted on the rear transverse arm (13) of the fixed support (9) by means of a pin (20) such as to be able to slide along said pin (20) and to pivot about a center of rotation formed by the pin (20), the caliper (19) straddling the friction pads (5-8) and the portion of the brake disc or disc (2, 3) disposed between said pads (5-8) ; and an actuating motor (23) mounted in the caliper and adapted to urge the internal pad (8) towards the external pad (5), the lining support plate (15) of which is in abutment with the outer leg (25) of the claiper (19) ; and locking means (17, 33, 34) associated with the forward arm (12) of the fixed support (9) and establishing between said forward arm (12) and the clipper (19) a connection which allows sliding, however prevents pivoting of said claiper (19), the lining support plates (15, 16) comprising at the two forward and rearward ends, close to their outer edge, forward and rearward locking and engagement noses (26, 27) delimiting forward and rearward retaining grooves (28, 29), respectively, the outer arms (12, 13) presenting at the internal side of the central recess (11) of the fixed support (9) forward and rearward corresponding locking and guiding rails (17, 18) delimiting the central recess (11), the lower face of the forward guiding rail (17) and the corresponding face of the forward retaining groove (28) of the lining support plate (15, 16) delimiting between them a blocking gap, the forward extremity of the caliper (19) presenting a blocking groove (34) having an active face which, when the caliper (19) in its operative position, is parallel to the lower face of the forward rail (17), aligned to the inclined face of the forward retaining grooves (28), characterized in that a retaining key (33) is disposed in said blocking gap and cooperates with the active face of the blocking groove (34) in a zone adjacent to the lining support plate (15, 16) of one of the friction pads (5-8), the radius of the outermost radial portion of the active face of the blocking groove (34) with respect to said center of rotation being smaller than the radius of the innermost portion of the face of the forward rail (17) in order to allow the pivoting of the caliper (19) about said center of rotation formed by the pin (20) after withdrawal of the retaining key (33), without axial displacement of the caliper and without displacement of the lining support plates (15, 16).</p> |
