An encapsulation device suitable for encapsulating a transmission component of an engine system that comprises a housing member configured to encapsulate the transmission component and define an air gap in a volume between an outer surface of the transmission component and an inner surface of the encapsulation device in use. The housing member is configured to allow air flow through the air gap during operation of the engine system and to retain a heated air layer around the encapsulated transmission component following engine system shutdown in use. The air gap enables convective cooling of the transmission components during periods when the vehicle is driving and additionally allows heat dissipation to occur when the vehicle engine is switched off.

A system, a differential, and method for maintaining temperature of a fluid circulating in a housing enclosing a gear system, contains a first heat exchanger positioned interior the housing. A first insulation layer is coupled to the housing and having a face in complete contact with the housing. A second fluid passageway formed between the outer surface of the gear and the primary heat transfer surface for the flow of the fluid circulating within the housing therethrough, wherein the fluid is brought into heat transfer relationship with the first heat exchange fluid flowing through said heat exchanger by means of rotation of the gear system.

A strain wave gearing with a built-in motor is provided with a motor, a wave gear mechanism enclosing the motor coaxially, and a heat-insulation spacing formed therebetween. The wave gear mechanism has a wave generator attached to the motor rotor so as to rotate integrally with the motor rotor. A wave generator plug of the wave generator is fixed to a rotor magnet back yoke of the motor rotor so as to enclose the rotor magnet back yoke. The spacing is formed in a contact surface portion between the rotor magnet back yoke and the wave generator back yoke, whereby heat transfer from the motor to the wave gear mechanism is suppressed.

A heat shield (44) for an external component, such as a gearbox (42), of a gas turbine engine (20) for limiting heat transfer from the engine (20) to the external component is disclosed. The heat shield (44) may be formed to the shape of the gearbox (42) to reduce the geometric envelope of the gearbox (42) and heat shield (44). The heat shield (44) may be formed by a thin thermal insulation core (50) surrounded by a metal sheet (51). The small thickness of the heat shield (44) also reduces the geometric envelope of the heat shield (44). Since no extra equipment is needed to provide cooling fluid to the gearbox (42), the heat shield (44) reduces the overall weight of the gas turbine engine (20) as well.

An encapsulation device suitable for encapsulating a transmission component of an engine system that comprises a housing member configured to encapsulate the transmission component and define an air gap in a volume between an outer surface of the transmission component and an inner surface of the encapsulation device in use. The housing member is configured to allow air flow through the air gap during operation of the engine system and to retain a heated air layer around the encapsulated transmission component following engine system shutdown in use. The air gap enables convective cooling of the transmission components during periods when the vehicle is driving and additionally allows heat dissipation to occur when the vehicle engine is switched off.

A number of variations include an accumulator constructed and arranged to store pressurized hydraulic fluid and a thermal containment device surrounding at least a portion of the accumulator constructed and arranged to reduce the loss of heat from hydraulic fluid stored in the accumulator.

A vehicle is provided. The vehicle includes a power source, at least one wheel, a gearbox. The gearbox includes a housing, gearing disposed in the housing, and an insulator disposed between the gearing and the housing. The gearing is configured to couple the power source to the at least one wheel. The insulator is configured to reduce thermal energy losses of a fluid that lubricates the gearing.

A cooling device (2) is provided for a hybrid module (1) of a hybrid vehicle. The hybrid module (1) has an actuator arranged between an internal combustion engine and an electric drive unit of the hybrid vehicle for actuating a separating clutch for separating the internal combustion engine and the electric drive unit. The hybrid module (1) also has control electronics (7). The actuator and the control electronics (7) are arranged within a heat protection hood (9) and at least the control electronics (7) are connected to the heat protection hood (9). The heat protection hood (9) is composed of heat-conducting material and is connected to a housing part (5) of the hybrid module (1). The cooling device enables use of the hybrid module in the region of hot components, such as the internal combustion engine or an exhaust system.

In a vehicular driving device, an oil storage section in which oil is stored is formed in a lower part of a case, the case includes a heat transfer inhibiting section that is provided at a position in an up-down direction based on an oil level in the oil storage section in such a way as to extend in a horizontal direction, and the heat transfer inhibiting section has higher thermal resistance than a portion of the case being located on an upper side with respect to and adjacent to the heat transfer inhibiting section or a portion of the case being located on a lower side with respect to and adjacent to the heat transfer inhibiting section.