Abstract: Proposed is a dynamometer for measuring load of a rotary shaft to be tested, the dynamometer comprising: a dynamometer shaft connected to the rotary shaft to be tested; a casing part having a through hole through which the dynamometer shaft passes, and a water supply chamber and a drain chamber therein; a stator part including a first stator and a second stator to be spaced apart from each other; a toroidal chamber partitioning part partitioning a toroidal chamber into a first toroidal chamber and a second toroidal chamber, wherein the toroidal chamber partitioning part comprises a runner and a guide ring, forming a drain slot through which the fluid is discharged from the first toroidal chamber and the second toroidal chamber to the drain chamber; and a flow adjusting part adjusting flow rate of the fluid.

Abstract: A hydrodynamic-type hydraulic dynamometer is provided. The hydrodynamic-type hydraulic dynamometer includes a shaft rotatably mounted by a plurality of bearings, a stator fixed around the shaft and having a toroidal chamber therein, a runner rotatably coupled to the shaft and causing a fluid introduced into the toroidal chamber to flow therethrough, an inner ring mounted to extend inwardly from a radially outer side of the toroidal chamber and having a control slit formed therethrough, and a shutter configured to adjust an opening degree of the control slit.

Abstract: A dynamometer test unit configured for use in a vehicle dynamometer system for dynamometer testing of a vehicle, the dynamometer test unit being configured to be connected to a wheel shaft of a vehicle, the dynamometer test unit comprising a power source having a stator and a rotor and being configured to, during testing, apply torque to a wheel shaft of the vehicle being tested, the power source being carried by a stator support, the stator being journaled in relation to the stator support, the dynamometer test unit further comprising means for measuring torque comprising an elastic strip, wherein the elastic strip connects the stator to the stator support, thereby restraining relative rotational movement between stator and stator support, and configured to transfer force between the stator and stator support, the elastic strip being firmly secured in a manner such that it is subjected to homogenous tensile prestress in a longitudinal direction of the elastic strip.

Abstract: A system for testing an engine, the engine including, a drive shaft, and a fluid circulation subsystem, the fluid circulation subsystem having at least one heat exchanger, and a fresh water pump (engine auxiliary water pump). The portable engine test tool can couple to the engine flywheel housing or output shaft of the transmission and can use the fresh water pump of an engine to provide water to an attached or integrated dynamometer and provide braking force to such. In some embodiments the portable engine testing system can use a fresh water supply reservoir.

Abstract: A method and a device for dynamometer testing of a motor vehicle (1), having a front end and a rear end and a right side and a left side, as seen in a driving direction, and/or vehicle components, by measuring torque and rotational speed on drive shafts (3LF, 3RF, 3LR, 3RR) of the vehicle, wherein a braking torque is applied to each one of said shafts by individual hydraulic dynamometer test units by throttling hydraulic fluid flows, and wherein said braking torque is adjustable for each individual one of said drive shafts (3LF, 3RF, 3LR, 3RR) such that a resulting individual rotational speed for that shaft corresponds to a virtual vehicle speed when driving the motor vehicle on a road, compensated with a slip value.

Abstract: A waterbrake dynamometer fluid volumetric control system and method includes a closed-loop recirculation passage to maintain a substantially constant fluid volume within the waterbrake. Fluid volume within the waterbrake is controlled by selectively supplying fluid to, and removing fluid from, the waterbrake.

Abstract: A modular waterbrake that can be used with differing types and sizes of rotating machines includes common end stages, and a plurality of common intervening power stages. Each power stage will extract a certain amount of shaft horsepower from the machine under test, and each stage operates independently of one another. Thus, the modular water dynamometer can be used to zero in on desired torque test loads during machine testing, by simply activating or deactivating selected stages.

Abstract: A method of using a magnetic fluid clutch for torque measurement comprises steps of modulating electric current through a coil of the magnetic fluid clutch to maintain a steady-state quasi-solid phase of a magnetic fluid medium contained within the magnetic fluid clutch when the magnetic fluid clutch is clutched to transmit torque from a torque input end of the clutch to a torque output end of the clutch, thereby ensuring that the torque output end rotates in response to the rotation of the torque input end without relative rotational slippage therebetween; and measuring a deflection value associated with the magnetic fluid clutch. The clutch is thereby used as a combined torque measurement and clutch apparatus.