| 摘要 |
<p>The elasticity curve (F1(d)) of an elastomer resetting membrane (17) is non linear and is situated below the tangent (F3(d)) at least near to a second displacement value (d1). The elasticity curve (F1(d)) of the resetting device has a maximum (57) between first and second values of displacement. and a minimum sensibly at the level of the second value of displacement. The curves initial part is linear (56). The anti-vibration support in which the resetting device has an elastomer membrane (17) which at rest has a sensible tronconic shape converging towards a work chamber (A) from an annular base (17a) fixed to a rigid partition (10) which delimits the working chamber. An exciter (34) has a rigid central wall connected to the partition (10) and also connected to the latter by the membrane (17). The membrane has an annular zone (17b) of reduced thickness near to is annular base (17a). A control unit has a chamber (P) which is in contact with a second face of the exciter (34) and which is designed to be selectively connected to either a depression source (52) or to atmosphere. An actuator (50,51) is designed to be connected to a sensor (55) which receives data representing the automobiles engine operating regime. This actuator is designed to connect cyclically the pneumatic chamber (P) with the depression source (52) and with atmosphere so as to vibrate the actuator (34) which generates counter vibrations in the working chamber (A) when the data received from the sensor (55) indicates that the motor is slowing down;and to connect the chamber (P) permanently to the depression source (52) when the data from the sensor (52) indicates the motor is operating at a higher speed so as to maintain the exciter (34) in its stop position at the end of its travel. The actuator (50,51) is designed so that the chamber (P) applies to the exciter (34) an average force (Fm) corresponding to a part (58) of the initial linear elasticity curve (17) when the motor is slowing down.</p> |
