The invention relates to a mechanical seal arrangement, in particular a retarder-mechanical seal arrangement, comprising a first mechanical seal (2) with a first rotating slide ring (3) and a first stationary slide ring (4) which define a first sealing gap (5) in between them, an additional seal (6), a cooling medium space (7) which is filled with a cooling medium and extends all the way to the sealing gap of the first mechanical seal (2), wherein the first mechanical seal (2) seals the cooling medium space against an environment, a cooling medium access (8) into the cooling medium space (7) for supplying cooling medium, and a cooling medium exit (9) from the cooling medium space (7) for draining cooling medium, wherein the additional seal (6) is arranged in the cooling medium access (8), and wherein the additional seal (6) is configured to open when a pressure inside the cooling medium access (8) rises above a first pressure (P1) inside the cooling medium space (7), and to close at a second pressure (P0) inside the cooling medium access (8) that is lower than the first pressure (P1) inside the cooling medium space.

A flywheel device includes an enclosure that surrounds an interior chamber that includes a rotor, which during normal operation is maintained in a vacuum state and spinning, the enclosure includes a first opening, and a valve that attaches to the enclosure, configured to enable, when actuated, ambient air to flow from the exterior of the enclosure into the chamber through the first opening, thus allowing the internal air pressure to rapidly approach ambient air pressure and thereby increase the air drag which acts as a brake on the spinning rotor.

An oil supply system for an automatic transmission or for an automated manual transmission in a drive train. The oil supply system includes an oil sump and a heat exchanger, wherein the oil supply is provided for at least the following operating states of the automatic transmission: a converter mode; a drive mode in one of the mechanical gears; and a retarder mode.
To optimize cooling of the oil volume flows in the different operating states two heat exchangers are provided, through which an oil volume flow can be conducted depending on the operating state of the transmission.

An oil supply system for an automatic transmission or for an automated manual transmission in a drive train. The oil supply system includes an oil sump and a heat exchanger, wherein the oil supply is provided for at least the following operating states of the automatic transmission: a converter mode; a drive mode in one of the mechanical gears; and a retarder mode.
To optimize cooling of the oil volume flows in the different operating states two heat exchangers are provided, through which an oil volume flow can be conducted depending on the operating state of the transmission.

A control device and a method for controlling traveling speed of a vehicle for the purpose of maintaining a vehicle speed equal to or lower than a pre-set downhill speed (v.sub.dh-set). The method comprises simulating a vehicle speed profile for an upcoming road section if braking at a pre-identified power level (P1, P2, P3) would currently be requested, thereby obtaining a predicted maximum vehicle speed (v.sub.P1,max, v.sub.P2,max, v.sub.P3,max) and a predicted time until a vehicle speed equal to or within a pre-selected interval (I.sub.dh) of the pre-set downhill speed is reached. The method further comprises, if the predicted maximum vehicle speed is equal to or below the pre-set downhill speed (v.sub.dh-set) and the predicted time is below a preselected threshold time limit, requesting braking at the pre-identified power level or at an adjusted power level.

A retarder arrangement (1) is configured to brake rotation of a shaft (3) of a vehicle (5). The arrangement (1) includes a retarder rotor (7), a retarder transmission (9), a lubricant feed conduit (11) arranged to conduct lubricant to the retarder transmission (9), a coupling device (13), and an actuator element (15). The actuator element (15) is moveable between an actuated position and an unactuated position to move the coupling device (13) between an engaged state and a disengaged state. The coupling device (13) is configured, in the engaged state, to connect the retarder rotor (7) to the shaft (3) via the retarder transmission (9), and in the disengaged state, to disconnect the retarder rotor (7) from the shaft (3). The lubricant teed conduit (11) includes a valve (17) mechanically connected to the actuator element (15). The present disclosure further relates to a transmission arrangement (40), a power train (50), and a vehicle (5).

A retarder arrangement (1) is configured to brake rotation of a shaft (3) of a vehicle (5). The arrangement (1) includes a retarder rotor (7), a retarder transmission (9), a lubricant feed conduit (11) arranged to conduct lubricant to the retarder transmission (9), a coupling device (13), and an actuator element (15). The actuator element (15) is moveable between an actuated position and an unactuated position to move the coupling device (13) between an engaged state and a disengaged state. The coupling device (13) is configured, in the engaged state, to connect the retarder rotor (7) to the shaft (3) via the retarder transmission (9), and in the disengaged state, to disconnect the retarder rotor (7) from the shaft (3). The lubricant teed conduit (11) includes a valve (17) mechanically connected to the actuator element (15). The present disclosure further relates to a transmission arrangement (40), a power train (50), and a vehicle (5).

A motor vehicle transmission (2) for a commercial vehicle which has at least one transmission input shaft (8, 9) and at least one transmission stage, which on a drive output side serves to connect, in each case, a driveshaft (22) of an associated retarder (3) and can be linked into a force flow. To enable the at least one retarder (3) to be connected on the drive input side of the motor vehicle transmission (2), a drive input side of the at least one transmission stage is arranged on the at least one transmission input shaft (8, 9).

A motor vehicle transmission (2) for a commercial vehicle which has at least one transmission input shaft (8, 9) and at least one transmission stage, which on a drive output side serves to connect, in each case, a driveshaft (22) of an associated retarder (3) and can be linked into a force flow. To enable the at least one retarder (3) to be connected on the drive input side of the motor vehicle transmission (2), a drive input side of the at least one transmission stage is arranged on the at least one transmission input shaft (8, 9).

An oil supply system of an automatic transmission or an automated manual transmission in a power train has an oil pan and a pressure line for supplying elements of the transmission with pressurized oil. A pumping device pumps oil from the oil pan into the pressure line at a supply pressure P.sub.0. A hydrodynamic converter, being a starting element, forms a subsection of the pressure line. A hydrodynamic retarder is disposed in a retarder oil circuit. At least a first switching valve, a second switching valve and a heat exchanger, wherein the heat exchanger is selectively switchable, by way of the switching valves, as a subsection into the pressure line or the retarder oil circuit. A temperature sensor is provided following the pumping device in the direction of flow in order to detect the oil temperature in the pressure line.