An automatic transmission assembly for mounting to a power-source includes a torque converter operatively connected to the power-source. The transmission assembly also includes a turbine shaft for receiving power-source torque from the torque converter. The transmission assembly additionally includes a torque transfer system, having a gear-train and a hydraulic pressure operated torque-transmitting device, for receiving the torque from the turbine shaft and selecting an input-to-output speed-ratio of the transmission. The transmission assembly also includes an output member for receiving torque from torque transfer system and outputting the torque to drive a load. The turbine shaft defines a first passage configured to supply hydraulic pressure to the torque-transmitting device and a second passage configured to vent to atmosphere. The turbine shaft additionally defines a third passage fluidly connecting the first passage to the second passage and thereby configured to bleed air from the torque-transmitting device.

An automobile vehicle transmission air vent system includes a first component of a vehicle transmission having a resilient material seal member retained in a cavity created in the first component. A second component of a metal material includes a vent groove facing toward the seal member. A clutch pack of the vehicle transmission is actuated by one of the first component or the second component being displaced into engagement with the clutch pack. The vent groove receives a portion of the seal member in a first displaced position of the displaced one of the first component or the second component defining an air and oil flow path through the vent groove between the first component and the second component. The seal member is positioned outside of the vent groove in a second displaced position of the displaced one of the first component or the second component.

The disclosure relates to a shifting apparatus for shifting gear stages of a vehicle transmission. The shifting apparatus comprises at least one selector rod which is translationally movable along a shifting direction and the two rod free ends of which are mounted in a manner which can be loaded hydraulically in each case in a pressure chamber for hydraulic medium. The shifting apparatus has a pressure connector and a hydraulic pressure line which is connected to it at each pressure chamber. Moreover, a tank connector and a hydraulic return line which is connected to it are arranged at each pressure chamber. The two return lines open into a common tank line for connection to a hydraulic tank. Moreover, the disclosure relates to a towing vehicle with a shifting apparatus of this type.

A hydraulic clutch assembly includes a rotating shaft. A first clutch and a second clutch are coupled to the shaft. A first passageway located within the shaft supplies an actuating fluid to the first clutch. A second passageway located within the shaft supplies the actuating fluid to the second clutch. A first bleed passage is fluidly coupled with the first passageway. A second bleed passage is fluidly coupled to the second passageway and the first bleed passage. A first outlet is fluidly coupled to the first bleed passage. A second outlet is fluidly coupled to the second bleed passage. The first outlet and the second outlet merge together to form an outlet passage.

A piston, in particular for a gear-change selector, including a piston body with a piston skirt and with a piston end face which can be pressurised with a working fluid. The piston includes a first sealing portion and a second sealing portion. The piston body and the first sealing portion have mutually complementary geometries so that they form a first vent channel. The first vent channel is arranged in a hydraulic series circuit with the second sealing portion. The second sealing portion prevents venting up to a first pressure and allows this above the first pressure. The invention furthermore concerns a gear-change selector and a gearshift for a vehicle.

A fluid management system for an automotive propulsion system is provided. The fluid management system includes a conduit system configured to deliver hydraulic fluid. A housing defining a sump is configured to collect a volume of hydraulic fluid and gaseous fluid. At least one intake valve is disposed in selective fluid communication with the conduit system and the sump. The intake valve(s) is/are configured to allow the passage of the hydraulic fluid from the sump to the conduit system and to substantially prevent the passage of the gaseous fluid from the sump to the conduit system. Thus, hydraulic fluid that is substantially free of air is provided to hydraulic system components downstream of the intake valve(s).

A system for venting air from an automatic transmission clutch piston cavity includes a piston positioned in a piston cavity. The piston is slidably disposed to engage a clutch. A lip seal is seated in a seal groove of the piston. The lip seal includes: a body of a resilient material; multiple slots preformed about an outer perimeter of the body, each of the slots opening outwardly from an outer perimeter surface of the lip seal; and an angular spacing separating successive ones of the slots. Air within the piston cavity is vented through the multiple slots by application of a pressurized fluid against the lip seal.

A hydraulic clutch assembly includes a rotating shaft. A first clutch and a second clutch are coupled to the shaft. A first passageway located within the shaft supplies an actuating fluid to the first clutch. A second passageway located within the shaft supplies the actuating fluid to the second clutch. A first bleed passage is fluidly coupled with the first passageway. A second bleed passage is fluidly coupled to the second passageway and the first bleed passage. A first outlet is fluidly coupled to the first bleed passage. A second outlet is fluidly coupled to the second bleed passage. The first outlet and the second outlet merge together to form an outlet passage.

A fluid management system for an automotive propulsion system is provided. The fluid management system includes a conduit system configured to deliver hydraulic fluid. A housing defining a sump is configured to collect a volume of hydraulic fluid and gaseous fluid. At least one intake valve is disposed in selective fluid communication with the conduit system and the sump. The intake valve(s) is/are configured to allow the passage of the hydraulic fluid from the sump to the conduit system and to substantially prevent the passage of the gaseous fluid from the sump to the conduit system. Thus, hydraulic fluid that is substantially free of air is provided to hydraulic system components downstream of the intake valve(s).

An automatic transmission has an oil pump driven by a travelling driving source. An air vent structure that expels air bubbles contained in automatic transmission fluid during pump operation has an air vent hole whose one end communicates with an outlet port of the oil pump and whose other end opens toward the oil pan. An air vent tube is connected to an opening end of the air vent hole. The air vent tube is extended up to a strainer lower side gap area located between a strainer and the oil pan, and a tube opening end of the air vent tube is placed in oil of the automatic transmission fluid.