| 摘要 |
Actuation device (4) for actuating a hydraulic actuator such as a brake and/or clutch, in particular for motorcycles, comprising: a device body (8) provided with a tank of liquid (12), the device body (8) defining a housing seat (16) for at least one piston (20), the seat (16) having a main extension which defines an actuation direction (X-X) of the piston (20) and being in fluidic connection with the tank of liquid (12), the device body (8) supporting at least one actuation lever for the piston (20) according to a workingv stroke (28) parallel to the actuation direction (X-X), the piston (20) comprising a stem (36) which extends between an actuation end (40), at which it interfaces with the actuation lever and a thrust head (44) for pressurising the liquid in the hydraulic circuit of the actuator, wherein the piston (20) is elastically pressed by elastic means (48) in contrast with the action of the actuation lever, adapted to influence the piston (20) according to a relief stroke (52) opposite the working stroke (28). The device (4) comprises at least one stop (56) for determining the position at rest of the piston (20), the stop (56) forming an end stop or stop to the relief stroke (52) of the piston (20) under the thrust of the elastic means (48). The stop (56) is at least partially inserted inside the tank of liquid (12), and comprises at least one branch (60) which crosses at least partially the housing seat (16) of the piston (20) through at least one insertion hole (64), the branch (60) comprising an abutment (68) which intercepts a portion of the piston (20), forming the stop to the relief stroke (52); wherein the stop (56) comprises at least one branch (60) which intercepts the stem (36), the stem (36) having at least one recess (72) in relation to the thrust head (44), so as to form a support and an undercut for said branch (60), along the actuation direction (X-X), and a limit stop abutment for the relief stroke (52). |
