Pneumatic shifting-force assistance device

A pneumatic shifting-force assistance device for a manual transmission, comprising a housing structure (G) provided with a compressed-air inlet (DE) and a vent (LA), a control rod (2) on the input side that can be displaced along its axis (1), and an output unit (A) that surrounds the control unit and can be displaced parallel thereto, wherein:

• the output unit (A) comprises a working piston (K) guided sealingly in the housing structure and defining two pneumatic working chambers (9, 10);
• a valve arrangement (11), which exerts pneumatic sequential control from the output unit (A) to the control rod (2) by corresponding pressurization of the two pneumatic working chambers (9, 10), is provided functionally between the control rod (2) and the output unit (A) and fluidically between the compressed-air inlet and the pneumatic working chambers (9, 10);
• the valve arrangement (11) comprises two piston structures (3, 4) coupled with the control rod (2), guided sealingly and displaceably on the output unit (A), and two valve slides (17, 18) guided longitudinally displaceably relative to the control rod (2) as well as to the output unit (A), wherein each piston structure (3, 4) cooperates respectively along a sealing edge (34) with an associated valve slide (17, 18) and each of the two valve slides (17, 18) in turn cooperates respectively with an associated valve seat (25, 26) disposed on the output unit (A) so as to move therewith;
• a throttle device is associated at least with one piston structure/valve slide pair in such a way that a throttle seal (41) disposed on the output unit (A) so as to move therewith cooperates with at least one throttle passage (39) disposed on the valve slide (17, 18) in question or the piston structure (3, 4) in question, and the active cross-sectional area of which depends on the relative position of a component provided with the throttle passage (39) relative to the associated throttle seal (41).