Patent ID: 6949042

Claim:
A shiftable transmission having at least two gears, the shiftable transmission comprising: a first actuation device ( 9 ) actuatable in a closing direction by force of a first spring ( 12 ) and actuatable in an opening direction and by pressurization; a second actuation device ( 13 ) actuatable in a closing direction by force of a second spring ( 16 ) and actuatable in an opening direction and by pressurization; a first gear which is shiftable by actuation of said first actuation device ( 9 ) in the closing direction and by actuation of the second actuation device ( 13 ) in the opening direction; a second gear which is shiftable by actuation of said second actuation device ( 13 ) in the closing direction and by actuation of said first actuation device ( 9 ) in the opening direction; where an output of the transmission is decelerated when said first and second actuation devices ( 9 , 13 ) are actuated in the closing direction, and the spring force of said first spring ( 12 ) actuating exclusively upon said first actuation device ( 9 ) and the spring force of said second spring ( 16 ) actuating exclusively upon said second actuation device ( 13 ); wherein when the first gear is shifted, the actuation force of said first actuation device ( 9 ) is formed by the spring force of said first spring ( 12 ) and by a pressure medium resulting from the pressurization of said second actuation device ( 13 ); a piston ( 11 ) of said first actuation device ( 9 ) is disposed coaxially with a piston ( 15 ) of said second actuation device ( 13 ) and said piston ( 11 ) of said first actuation device ( 9 ) forms a cylinder for said piston ( 15 ) of said second actuation device ( 13 ); and the pressure medium is supplied to said second actuation device ( 13 ) through said piston ( 11 ) of said first actuation device ( 9 ).