Hydraulic gear selection drive means and associated transmission assembly
AssigneeSelect Design Technologies Limited
InventorBoris Klaricic
Life of this patent
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Abstract
In a transmission of the constant mesh type a number of gear selectors are driven by using a hydraulic coupling between input and output pistons. The hydraulic coupling functions as a hydraulic spring and force multiplier. A hydraulic actuator (23) is received by internal gear case wall (24) formed so as to prevent any radial or axial movement of the actuator itself. A hydraulic coupling, in this case the hydraulic coupling is formed as hydraulic springs or bags illustrated at (26).
Claims17
A hydraulic gear selection drive means in combination with a cone gear selector comprising a hydraulic drive assembly having an input piston, an output piston and a hydraulic coupling between the input and output pistons, the output piston being adapted to move into a gear engagement position in response to movement of said input piston in order to engage a gear, the hydraulic coupling and input and output pistons being mounted co-axially with the gear being selected, the cone gear selector employing a female cone surface and a male cone body having a driven cone surface and a driving cone surface, the driven cone surface being located between the driving cone surface and the female cone surface, the male cone body being axially moveable by a male cone body drive means to cause said cone surfaces to engage, the male cone body drive means comprises said hydraulic drive assembly, said hydraulic drive assembly of said male cone body drive means includes a fixed annular cylinder assembly with thrust bearings coupling the output piston to the male cone body.
A transmission assembly having an input, an output and gears constantly in mesh for selectively coupling the input to the output in predetermined ratio of input to output according to gear selection, at least one of said gears being a free rotating gear having a cone gear selector for selecting said one of said gears, the cone gear selector being driven by a hydraulic gear selection drive means comprising a hydraulic drive assembly having an input piston, an output piston and a hydraulic coupling between the input and output pistons, the output piston being adapted to move into a gear engagement position in response to movement of said input piston in order to engage a selected one of said gears, the hydraulic coupling input and output pistons being mounted co-axially with said selected one of said gears, the cone gear selector employing a female cone surface and a male cone body having a driven cone surface and a driving cone surface, the driven cone surface being located between the driving cone surface and the female cone surface, the male cone body being axially moveable by a male cone body drive means to cause said cone surfaces to engage, the male cone body drive means comprises said hydraulic drive assembly, said hydraulic drive assembly of said male cone body drive means includes a fixed annular cylinder assembly with thrust bearings coupling the output piston to the male cone body.
Dependencies are inferred from the claim text.