Hydraulic transmission assembly

A hydraulic transmission assembly comprising:

• a rotatable housing;
• a fixed output shaft at least partially disposed in said housing, said output shaft at least partially extending axially from said housing, said output shaft including first and second independently pressurizable fluid passages;
• a gerotor assembly cooperating with said output shaft, said gerotor assembly being in communication with said first and second fluid passages;
• and
• a pressure released brake assembly cooperating with said output shaft and said housing, wherein said housing defines a pressurizable brake chamber for housing said pressure released brake assembly,
• wherein pressurization of said first fluid passage rotates said housing in a first direction,
• wherein pressurization of said second fluid passage rotates said housing in a second direction, and
• wherein pressurization of either of said first fluid passage or said second fluid passage results in said pressure released brake assembly operating in a disengaged position which allows for rotation of said housing relative to said fixed output shaft in one of said first and second directions,
• wherein output shaft further includes a third fluid passage in communication with said brake chamber, wherein pressurization of either of said first fluid passage or said second fluid passage results in pressurization of said third fluid passage,
• wherein said output shaft further includes a first valve member, said first valve member allowing selective communication between either of said first fluid passage or said second fluid passage, when either of said first or second passages are pressurized, and said third fluid passage.

A hydraulic transmission assembly comprising:

• a gerotor assembly including a rotor and a stator;
• a drive link connected at a first end to the rotor;
• a stationary shaft connected to a second end of the drive link;
• a housing assembly receiving the gerotor assembly, the drive link and the stationary shaft;
• a first passage in the stationary shaft and in communication with the gerotor assembly;
• a second passage in the stationary shaft and in communication with the gerotor assembly;
• a first brake disk connected to the stationary shaft;
• a second brake disk connected to the housing assembly;
• a piston disposed in the housing assembly adjacent at least one of the brake disks, the piston cooperating with the housing assembly to define a brake pressure chamber, the housing assembly and the first and second passages being configured such that pressurization of either passage results in pressurization of the brake pressure chamber;
• and
• a biasing member disposed in the housing and contacting the piston, the biasing member urging the piston toward at least one of the brake disks.