Zf Friedrichshafen Ag

Bridgestone Corporation

Jens Eisenbeiss

Roland Bösl

Lorenzo Alleva

Markus Kramer

Wolfgang Saxinger

Roland BÖSL

A tire test stand includes a frame, a tire holder, and a hexapod assembly having six linear drive elements, each of the six linear drive elements being attached at a first end to the frame and at a second end to the tire holder. A tire can be attached to the tire holder so as to be rotatable about its axis of rotation. The test stand also has two rotatably mounted deflection pulleys that are partially looped around by a belt such that the belt forms a flat belt portion between the deflection pulleys. When the tire is rotatably attached to the tire holder, the tire can be brought into a contact position in which the tread of the tire contacts the flat belt portion. When in the contact position and the belt is moved in relation to the tire, the tire rolls on the flat belt portion.

Tire test stand with a hexapod assembly and a belt

A test bench and a method to predict pressure oscillations in a vehicle tire. The tire is rotatably positioned, via a bearing on a test bench rim, the tire is pressurized with fluid, a load is applied on the tire, the tire is accelerated according to pre-determinable speed ramp to a final speed, the fluid in accordance with the tire speed, undergoes an oscillation excitation, and reacts to the oscillation excitation with a pressure oscillation. The method is characterized in that an effective force of the tire, due to the pressure oscillation, at the bearing is continuously detected, and that a descriptive data set is determined for the tire speed over the frequency, a timing signal of the speed ramp undergoes a Fourier transformation and, in an analogous manner, a reference data set is created through the use of a vehicle rim instead of the test bench rim.

Method and test bench for predicting pressure oscillations in a vehicle tire

A method and test stand for determining tire properties of a vehicle tire which is rotatably positioned on a rim via a wheel bearing. The interior of vehicle tire is pressurized by a fluid and the vehicle tire is applied with a wheel load. The vehicle tire is accelerated to a final speed in accordance with a pre-determinable speed ramp. The vehicle tire, in accordance with a tire speed, undergoes an oscillation excitation and reacts to the oscillation excitation with an oscillation. The method includes continuously capturing an effective tire force of the vehicle tire in the wheel bearing, due to the oscillation, and creating a data set which shows the tire force over the tire speed and tire frequency, by applying a timing signal of the speed ramp to a Fourier transformation.

Method and test stand for detecting tire properties by generating tire force data vs tire speed and tire frequency

Friction disk sets of clutches and brakes are used, for example, in automatic transmissions. In clutch test benches for such clutches, the friction disks are held in a test chamber on inner and outer disk carriers. The test bench arrangement has a clutch unit which includes first and second disk carriers. The first disk carrier can be moved relative to the second disk carrier. A drive input section includes a drive input mechanism for producing relative movement between the first and the second disk carrier. A first driven shaft is mounted by at least one first bearing unit. The first disk carrier is drive-connected, via the first shaft, to the drive input mechanism. The first shaft is mounted to rotate by virtue of the first bearing unit. The test bench arrangement includes a measuring unit for determining a frictional torque of the first bearing unit.

Test bench arrangement for testing a multi-plate clutch

Testing the rolling resistance of a tire is a common procedure in tire testing. There is a tire testing machinesuggested, comprising a rolling device, a tire mounting deviceand a driving assembly, whereby the driving assemblyis operable to rotate the rolling deviceand/or the tire mounting deviceaccording to a configurable driving cycle, whereby the rolling devicehas a drumwith an outer peripheral surface, whereby the tireis rotatable mountable on the tire mounting device, whereby the tire mounting deviceis arranged that the tireis engaged with the outer peripheral surfaceof the drum, with a first torque measuring assembly, a second torque measuring assembly, and an angular velocity measuring assembly, whereby the first torque measuring assemblyis operable to measure a drum drive torque of the drumand the second torque measuring assemblyis operable to measure a tire drive torque of the tire (), whereby the angular velocity measuring assemblyis operable to measure and/or calculate the angular velocity of the tire &#x3c9;and the angular velocity of the drum &#x3c9;.

Tire testing machine, method for testing a tire and computer program

A test system for testing a rolling resistance of a vehicle tire, with a measurement device. The measurement device has a load device that includes a load roller which applies a test load on the tire. The measurement device has a receiving device which receives the tire. The receiving device and the load device can be moved relative to one another. The measurement device has a drive device which rotationally drives at least one of the load roller and the receiving device. The measurement device has at least one test configuration for measuring the rolling resistance. The receiving device has first and second rim elements that together form a split rim engagement unit for accommodating the tire.

Testing system for testing the rolling resistance of at least one vehicle tire and method for testing the rolling resistance of the vehicle tire

A wheel-force dynamometer () for the measurement of forces and torques acting upon a vehicle tire () and a vehicle wheel () using force sensors (). The vehicle wheel () is mounted and able to rotate on a wheel axle. The wheel-force dynamometer () has a wheel axle that is in the form of a hollow shaft () which is hydrostatically mounted on a rigid, fixed in position bearing journal ().

Wheel-force dynamometer for measuring tire forces

A wheel-force dynamometer () for measuring, via force sensors (), force and torque that act upon a vehicle tire () and a vehicle wheel (). The vehicle wheel () is mounted to rotate by way of a wheel axle. The wheel-force dynamometer () is characterized in that the wheel axle is in the form of a rotor () which is hydrostatically mounted, axially fixed and able to rotate in the circumferential direction, in a rigid and positionally fixed housing ().

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Fuerstenzell, Germany

Jens Eisenbeiss