| 摘要 |
<p>A control device for a gear change of a vehicle, in particular a commercial vehicle, provided with a casing (2), a control member (4) accommodated inside the casing (2) so as to be able to travel along its axis (A) to carry out a selection operation in the range of gears and occupy at least two selection positions (S4,S5), and so as to be able to rotate about said axis (A) to carry out a gear engagement/disengagement operation, with a first spring (49) interposed between the casing (2) and the control member (4) and adapted to exert along the axis (A) a first force (B1) on the control member (4) itself so as to bring it into abutment with a first stop means (11) defining a first (S5) of said selection positions (S4,S5), with a second spring (50) adapted to exert on the control member (4) a second force (B2) opposing the first force (B1) to displace the control member (4) itself towards a second stop member (31) defining a second (S4) of said selection positions (S4,S5), with a pneumatic cylinder co-operating with the spring (49,50) to counteract selectively the first and second forces (B1,B2) and bring the control member (4) in a stable manner respectively in the second selection position (S4) and in the first selection position (S5), and with a timed control unit (5) for controlling the pneumatic cylinder (5). <IMAGE> <IMAGE></p> |
