Continuously variable transmission

Details Continuously variable transmission Continuously variable transmission

2005-05-10

2005-05-10

Bucci, David A. (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

C474S018000

Reexamination Certificate

active

06890275

ABSTRACT:
A continuously variable transmission for a motor vehicle, possessing a variator (2, 2′) with a primary V-pulley set (3, 3′) and a secondary V-pulley set (4, 4′). In this arrangement are a primary V-pulley disk (5, 5′) and a secondary V-pulley disk (6, 6′), which are axially slidable by hydraulic force for the controlled adjustment of a pressure can be, respectively, loaded with an oil flow through an electro-hydraulically controlled pressure supply apparatus (1, 1′). The pressure supply apparatus (1,1′) is so designed, that the oil flow is brought to the V-pulley disks (5, 5′, 5, 6′) through a pressure line (8, 8′, 9, 9′) with at least one pressure controller (10, 10′, 11, 11′) and one pressure chamber (12, 12′, 13, 13′) with a variable volume (V1,V2). The pressure chamber (12, 12′) of the primary V-pulley disk (5, 5′) can be connected to a primary chamber20, 20′) of the cylinder (14, 14′), and the pressure chamber (13, 13′) can be connected with a secondary chamber (21, 21′) of said cylinder (14, 14′), in which, between the primary chamber (20, 20′) and the secondary chamber (21, 21′) a double action, reversible piston (15, 15′) is placed for directing pressurized oil from a low pressure side to a high pressure side of the variator (2, 2′) upon the shifting of said variator (2, 2′).

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