Disclosed herein are various dynamometer embodiments in which the devices have a cooling tank comprising cooling fluid, a rotatable drum body disposed over a stator body, and first and second friction disks axially extendable from the stator body such that the friction disks are frictionally engageable with the bases of the drum body. The bases of the drum body can be rotatable friction plates that are coupled via a connection tube to form the drum body.

A torque testing device includes a body defining an interior volume that is defined by an interior wall having a non-circular cross-section. A moveable portion is within the interior volume and is selectively movable from a first orientation within the interior volume to a second orientation within the interior volume. The moveable portion includes a core defining an aperture and a piston. A portion of the piston cooperates with the aperture of the core. When the moveable portion is in the first orientation, the piston is located at a first distance from the core. When the moveable portion is in the second orientation, the piston is located at a second distance from the core, the second distance being less than the first distance.

A torque testing device includes a body defining an interior volume that is defined by an interior wall having a non-circular cross-section. A moveable portion is within the interior volume and is selectively movable from a first orientation within the interior volume to a second orientation within the interior volume. The moveable portion includes a core defining an aperture and a piston. A portion of the piston cooperates with the aperture of the core. When the moveable portion is in the first orientation, the piston is located at a first distance from the core. When the moveable portion is in the second orientation, the piston is located at a second distance from the core, the second distance being less than the first distance.

Turbomachines such as air dynamometers are disclosed that include a radial outflow compressor and gas collector. In some examples, the gas collector is designed as a separate component that is coupled to the machine, such as coupled to a frame. In some examples, the collector and frame are intentionally spaced and coupled at discrete points to minimize the transfer of mechanical and thermal energy therebetween. Aspects of the present disclosure also include turbomachines that include at least one impeller bypass flow path for the direct transfer of air between ambient and a location in the collector downstream of the impeller blades. In some examples, such flowpath(s) may allow for the inflow of external ambient air into the collector.

Disclosed herein are various dynamometer embodiments in which the devices have a cooling tank comprising cooling fluid, a rotatable drum body disposed over a stator body, and first and second friction disks axially extendable from the stator body such that the friction disks are frictionally engageable with the bases of the drum body. The bases of the drum body can be rotatable friction plates that are coupled via a connection tube to form the drum body.

Disclosed herein are various dynamometer embodiments in which the devices have a cooling tank comprising cooling fluid, a rotatable drum body disposed over a stator body, and first and second friction disks axially extendable from the stator body such that the friction disks are frictionally engageable with the bases of the drum body. The bases of the drum body can be rotatable friction plates that are coupled via a connection tube to form the drum body.

Hydraulic braking device for testing industrial screwdrivers, said braking device being arranged on a braking simulation bench, said braking device being controlled by an actuator and by a hydraulic control circuit which supplies pressure to the device on the basis of the indications of an electronic elaboration unit (U) of said bench. Such a braking device is provided with coupling means (A) for said screwdriver to be subjected to test and measurement transducers (TR) controlled by said processing unit, suitable for measuring the torque exerted by the screwdriver and the rotation angle, and such a device comprises a memory which can be read and/or written by the bench electronic elaboration unit.

Hydraulic braking device for testing industrial screwdrivers, said braking device being arranged on a braking simulation bench, said braking device being controlled by an actuator and by a hydraulic control circuit which supplies pressure to the device on the basis of the indications of an electronic elaboration unit (U) of said bench. Such a braking device is provided with coupling means (A) for said screwdriver to be subjected to test and measurement transducers (TR) controlled by said processing unit, suitable for measuring the torque exerted by the screwdriver and the rotation angle, and such a device comprises a memory which can be read and/or written by the bench electronic elaboration unit.

Turbomachines such as air dynamometers are disclosed that include a radial outflow compressor and gas collector. In some examples, the gas collector is designed as a separate component that is coupled to the machine, such as coupled to a frame. In some examples, the collector and frame are intentionally spaced and coupled at discrete points to minimize the transfer of mechanical and thermal energy therebetween. Aspects of the present disclosure also include turbomachines that include at least one impeller bypass flow path for the direct transfer of air between ambient and a location in the collector downstream of the impeller blades. In some examples, such flowpath(s) may allow for the inflow of external ambient air into the collector.

A vehicle dynamometer system for dynamometer testing of a vehicle, comprises at least one dynamometer test unit having a power source, the power source comprising an output shaft arranged for, in use, rotation with a vehicle wheel shaft, the system further comprising an adapter plate, said adapter plate comprising fasteners for allowing fixed connection to a wheel hub of a wheel shaft being tested, said adapter plate further comprising fasteners for allowing fixed connection of the adapter plate to the output shaft of said dynamometer test unit to thereby connect the output shaft of the dynamometer test unit to said wheel shaft. The adapter plate is designed such that, when fixedly connected to said wheel hub but disconnected from said dynamometer test unit, said adapter plate is arranged to support the vehicle to allow relocation of said vehicle while supported by said adapter plate.