Abstract: A gas turbine engine clutch includes a dry clutch assembly, forward and aft working areas, and a shaft. The dry clutch assembly is operative to receive power from a gas turbine engine. The dry clutch assembly is configured to selectively engage the gas turbine engine with a driven source, and has an axial opening extending therethrough. The forward and aft working areas are disposed at axially opposite ends of the dry clutch assembly. The shaft extends axially through the axial opening of the dry clutch assembly, and defines an axial fluid flow passage therethrough in liquid fluid communication with the forward and aft working areas.

Abstract: A clutch and/or brake module has a heat sink which is attached to a transmission housing for the purpose of discharging heat. The brake module further has a brake disc, which is connected to a rotational member formed by a shaft (schematically indicated by a center line). The brake disc is provided on one side with a lining and faces with this side towards the heat sink. The brake is a dry brake and is not lubricated. The brake module further has an actuation system (cylinder with piston movable therein, schematically indicated by an arrow) which can exert an axial pressing force directly on the brake disc. The brake disc is located axially between the heat sink and the actuation system. The cooling plate is secured to a transmission housing, a part of which is schematically shown.

Abstract: The invention relates to a friction clutch in a motor vehicle, comprising a clutch bell housing (210), at least one air inlet duct (130) arranged on the clutch bell housing for cooling the clutch bell housing, at least one air outlet duct (140) arranged on the clutch bell housing, and at least one temperature sensor (120). The invention further relates to a method for determining a clutch temperature of a friction clutch.

Abstract: The present disclosure relates to a control circuit for a vehicle transmission cooling system having a controller configured to control an air compressor to selectively pressurize a transmission clutch housing and provide air to an alternative vehicle subsystem (or subsystems).

Abstract: A clutch assembly includes a shaft, vent plug and oil guide sleeve. The shaft includes an internal cavity, first passages for allowing oil to lubricate clutch components, and second passages for allowing excess oil to drain from the internal cavity. The vent plug has a radial passage in communication with the internal cavity for venting the cavity with an external source of air. The oil guide sleeve directs oil into the internal cavity. A method for lubricating and venting an air turbine starter includes delivering lubricating oil to an internal cavity of a clutch via an oil guide sleeve. The oil guide sleeve prevents oil from exiting the cavity through excess oil drainage passages before it lubricates the clutch components. The method also includes draining excess oil from the cavity through excess oil drainage passages so that excess oil does not substantially impede air flow through a vent plug passage.

Abstract: The present disclosure relates to a control circuit for a vehicle transmission cooling system having a controller configured to control an air compressor to selectively pressurize a transmission clutch housing and provide air to an alternative vehicle subsystem (or subsystems).

Abstract: A system for controlling temperature of a transmission clutch includes a housing containing the clutch, a fan for circulating air through the housing and over the clutch, and a controller configured to determine an inferred temperature at a reference surface on the clutch and to actuate the fan in response to the inferred temperature.

Abstract: The present disclosure relates to durability enhancement techniques for a dry-clutch vehicle transmission. A cooling system that provides a direct convective cooling path to friction surfaces is disclosed. Also disclosed is a continuously variable clutch wear compensation assembly configured to adjust the position of clutch assembly components on-demand or as needed.

Abstract: A centrifugal clutch including a driver adapted to engage and be rotated by an input shaft, a drum adapted to engage a driven component, a plurality of shoes located between the driver and the drum, and a plurality of springs, each spring engaged with adjacent shoes for urging the shoes together. The shoes are radially movable between an outward position in which the shoes contact the drum and an inward position in which the shoes are spaced apart from the drum. Each shoe has an engagement surface which is arranged to contact the drum, and a support. One end of the support is attached to the engagement surface and the other end extends radially inward. A pair of spring attachment mounts are formed on the radially inward end of the support. Each spring is engaged with one spring attachment mount on a shoe.

Abstract: A centrifugal clutch including a driver adapted to engage and be rotated by an input shaft, a drum adapted to engage a driven component, a plurality of shoes located between the driver and the drum, and a plurality of springs, each spring engaged with adjacent shoes for urging the shoes together. The shoes are radially movable between an outward position in which the shoes contact the drum and an inward position in which the shoes are spaced apart from the drum. Each shoe has an engagement surface which is arranged to contact the drum, and a support. One end of the support is attached to the engagement surface and the other end extends radially inward. A pair of spring attachment mounts are formed on the radially inward end of the support. Each spring is engaged with one spring attachment mount on a shoe.

Abstract: The friction device comprises a non-rotary casing (50) in the form of a cage in which there are received a thrust structure (30), a set of friction disks (21, 22, 23, 24, 25) on a common axis, and a backing structure (40), the casing having a peripheral wall provided with ventilation openings (54). The friction device is actuated by a pneumatic actuator (60) mechanically connected to the central portion of the thrust structure through a central opening in an end wall (51) of the casing. Thermal insulation is arranged between the set of disks (21, 22, 23, 24, 25) and the outside of the casing adjacent to the end wall provided with the bearing unit (11) for the rotary shaft (10), and comprises at least one heat barrier (76-77, 78-79) situated at the bearing unit (11).