Patent ID: 8500587

Claim:
A system for providing hydraulic power in a machine transmission comprising: a first hydraulic variator having: a first input, a first hydraulic pump linked to the first input, a first hydraulic motor linked to the first hydraulic pump via a first hydraulic circuit having a first side and a second side, and a first output from the first hydraulic motor; a second hydraulic variator having: a second input, a second hydraulic pump linked to the second input, a second hydraulic motor linked to the second hydraulic pump via a second hydraulic circuit having a first side and a second side, and a second output from the second hydraulic motor; a first bridging hydraulic link hydraulically connecting the first side of the second hydraulic circuit to the first side of the first hydraulic circuit; a second bridging hydraulic link hydraulically connecting the second side of the second hydraulic circuit to the second side of the first hydraulic circuit; a common input geared to the first input and the second input, such that the first and second inputs rotate at a same input speed; and a common output geared to the first output and the second output, such that the first and second outputs rotate at a same output speed; and a controller configured to control the first hydraulic variator and the second hydraulic variator in accordance with a variator output control mode and an always matching working mode of the first and second hydraulic variators.