Abstract: A fan assembly may include an input shaft, first and second belts, first and second pulleys engaged by the first belt, third and fourth pulleys engaged by the second belt, output shaft rotationally coupled to a fan, and a clutch assembly. The second pulley may be rotationally coupled to the first pulley via the first belt so as to rotate in the same direction as the first pulley. The fourth pulley may be rotationally coupled to the third pulley via the second belt so as to rotate in the opposite direction of the third pulley. The clutch assembly may be configured to selectively rotationally couple the output shaft to the input shaft via the first pulley, first belt, and second pulley. The clutch assembly may also be configured to selectively rotationally couple the output shaft to the input shaft via the third pulley, second belt, and fourth pulley.

Abstract: A fan assembly may include an input shaft, first and second belts, first and second pulleys engaged by the first belt, third and fourth pulleys engaged by the second belt, output shaft rotationally coupled to a fan, and a clutch assembly. The second pulley may be rotationally coupled to the first pulley via the first belt so as to rotate in the same direction as the first pulley. The fourth pulley may be rotationally coupled to the third pulley via the second belt so as to rotate in the opposite direction of the third pulley. The clutch assembly may be configured to selectively rotationally couple the output shaft to the input shaft via the first pulley, first belt, and second pulley. The clutch assembly may also be configured to selectively rotationally couple the output shaft to the input shaft via the third pulley, second belt, and fourth pulley.

Abstract: In a method of melting metal of a predetermined liquidus temperature, particularly a non-iron metal, such as magnesium, in a heated melting chamber into which solid metal is introduced and where a stream is generated, the parameters of flow are chosen such that the melting time is, in maximum, half the melting time without this stream under the condition that the temperature of the molten metal, when measured at at least one place in a distance of 5 mm in maximum from the solid metal, does not fall below liquidus temperature. To this end, an apparatus may be provided comprising at least one pump in a melting chamber having an associated heating device. This pump sucks the melt through at least one inlet opening and discharges the melt through at least one outlet opening. Both inlet opening and outlet opening are arranged within the melt bath of the melting chamber.

Abstract: A dual path hydrostatic drive system having an electronic auxiliary drive auxiliary drive controller controlling the hydraulic output of left and right variable displacement pumps in response to the speed of the main drive wheels and a speed ratio signal from a speed ratio input control. In addition, the auxiliary drive auxiliary drive controller controls the outputs of the pumps within three basic boundary conditions; a hydraulic pressure boundary condition, a motor speed boundary condition and a power boundary condition. A clutch mode activation switch has two positions for signaling the auxiliary drive auxiliary drive controller to operate in a first mode in which the auxiliary drive system is shut down upon activation of the main clutch or a second mode where the auxiliary drive controller attempts to mirror the operation of the main drive wheels.

Abstract: A compact final drive assembly comprises a stationary housing and a rotatable housing. A bent axis hydraulic motor is coupled to the stationary housing. The bent axis hydraulic motor drives a planetary drive unit for driving the rotatable housing. A clutch/brake unit controls the planetary drive unit by braking the planet carrier. The clutch/brake unit is provided with a ring piston that is supplied pressurized hydraulic fluid from the motor inlet port of the bent axis hydraulic motor.

Abstract: A melt withdrawal device for melt furnaces for charging casting machines has a melt conveying pump (1) comprised of a pump tube (2) forming a lower melt inlet (3) and an upper melt outlet (4) and of a pump shaft (5) extending inside the pump tube (2) and carrying a pump rotor (6). To achieve a melt conveyance which is largely independent of the melt level variations inside the melt furnace and can thus be dosed property, a charging means (7) for keeping constant the pump head (h) is provided before the melt conveying pump (1), which charging means (7) comprises a charging tank (8) accommodating the pump tube (2) with the melt inlet (3) and a charging pump (10) capable of filling the charging tank (8) with melt up to a melt overflow (9) determining the charging height, where the delivery rate of the charging pump (10) exceeds that of the conveying pump (1).

Abstract: A vehicle, such as a crawler tractor or the like, includes separate reversible hydrostatic transmission units which are adapted for driving the tracks of the tractor. The transmission units are controlled through means including a valve assembly actuated by a first manually operable linkage for simultaneously effecting changes in the speed and direction of rotation of the units, and through means of a pair of second manually operable linkages for in effect overriding the transmission condition selected by the first manually operable linkage by selectively retarding the speed of and/or changing the direction of rotation of the hydrostatic motors for effecting steering of the vehicle.