Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
  • G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M17/00—Testing of vehicles
  • G01M17/007—Wheeled or endless-tracked vehicles
  • G01M17/06—Steering behaviour; Rolling behaviour

Definitions

• the present invention relates to a test bench for motor vehicles, with a rolling device having a tread for rolling the wheels, the tread being driven in rotation and preferably being lockable and / or braked and / or unlockable.
• testing has been carried out with very special equipment, namely with test plates, test rolls or using a decelerator.
• test plates When testing using test plates and using a decelerator, one speaks of a dynamic test.
• test rolls When using test rolls, one speaks of a static test.
• the difference between the dynamic test and the static test is that when testing with test plates or with a decelerator, the vehicle must be moved. The test plates and the decelerator are fixed.
• test rollers the vehicle stands still and the test rollers rotate.
• a partial section of a road is simulated with the test plate, the test plate being mounted on rollers.
• the vehicle travels over the test plate, which is connected to the environment in the direction of travel via a measuring element, for example with a drive-on plate. If the vehicle is braked on the test plate, the braking forces that occur during braking are recorded via the measuring element.
• the measuring process only takes as long how the vehicle is on the limited test plate. In practice, the measurement time is between 0.5 and 1 second.
• the plate brake test bench it is disadvantageous with the plate brake test bench that the measurement result is dependent on the approach speed. In addition, the measurement can only be carried out over a very small time segment, since the length of the brake plate is limited. Ultimately, the plate brake tester is not very practical, since it is not only extremely difficult for a layperson to be precise, i.e. exactly when driving on the test plate to start the braking maneuver.
• a test stand is also known, for example, from US Pat. No. 1,957,455, the wheel for testing being in a type of “shell”. This increases the wheel contact area, which no longer corresponds to the state on the road.
• the rolling device is at least slightly movable with at least two degrees of freedom.
• forces occurring in the direction of travel - for example during brake tests - but also, for example, transverse forces - lateral forces - can be detected and documented.
• the force between the rolling device and force acting at a predeterminable fixed point can be measured.
• the displacement path and / or angle of rotation that occurs during driving and / or braking movements of the motor vehicle can also be measured between the rolling device and a predeterminable fixed point.
• forces acting in different directions and / or displacement paths and / or occurring angles of rotation can be measured between the rolling device and a predeterminable fixed point.
• the tread and / or the rolling device for tracking measurement could be shifted until no more force acts on the tread and / or the rolling device. In other words, the force is then 0.
• the displacement path is measured in this direction, a lateral drift of the vehicle can be determined.
• Another degree of freedom could correspond to a movement along the direction of travel, in particular along a Y axis.
• the force in or against the direction of travel can be measured in this direction.
• the force in the direction of travel corresponds to a braking force, the force against the direction of travel corresponds to the acceleration.
• the weakening or weakenings could or could be formed by recesses and / or millings in a structurally particularly simple manner. At least one force transducer and / or at least one sensor for bends and / or torsions could be arranged in the weakening or weakenings in a particularly simple manner in terms of measurement technology. Strain gauges could be used as force transducers or sensors. Any force transducers or sensors could move through the recesses, millings or receptacles under load. For example, horizontal and vertical braking forces can be measured. In the case of particularly meaningful measurements, a separate rolling device could be provided for each wheel of an axle. Each of the two rolling devices could be assigned to a separate frame.
• the test bench according to the invention works in a similar way to the conventional roller test bench.
• the vehicle is required to use the each wheel to be tested runs on the unrolling device, after which it is driven.
• the motor vehicle stops on the spot the wheels are rotated, thereby simulating an acceleration of the vehicle.
• a free-running is in front of the first roller or roller, i.e. behind the wheel on the unrolling device Support roller arranged against which the wheel can be supported when braking. This ensures safe positioning of the wheel on the test bench.
• the force absorption and / or the measurement of the displacement path and / or the angle of rotation can be carried out at any point between the rollers or rollers and the frame, wherein the rollers must be able to be displaced and / or rotated within the frame.
• At least one roller or roller could be designed as a non-positive drive roller or roller.
• the roller would be driven in rotation.
• the other roller or roller or rollers or rollers could or could be designed as a non-positive deflection roller or roller. This would result in a rotary drive via the tread or the treadmill.
• the roller or roller could be freely rotatable.
• At least one motor preferably an electric motor, could be provided, which engages the one or more rollers or rollers by means of a chain, drive belt or the like.
• Gasoline or gas engines are also suitable as engines. Ultimately, any engine is conceivable. Even a magnetic drive could be implemented. Any motor could be decoupled to drive the belt or the tread, so that an idle is possible.
• the tread could be designed as a treadmill, preferably as a fabric belt. This ensures permanent operation of the test bench.
• FIG. 7 shows a schematic front view of the test bench from FIG. 1 in an underfloor installation
• FIG. 8 shows a schematic front view of a further exemplary embodiment of the test bench according to the invention with an above-ground arrangement
• Fig. 9 is a schematic plan view and front view of the rolling device with an embodiment as an XY slide with ball bearings and
• FIG. 10 shows the rolling device 1 in a schematic side view with an extended support roller 25 against which the wheel 2 can be supported.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

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Family Applications (1)

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Cited By (2)

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Citations (6)

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• 2003
  • 2003-06-06 DE DE20320215U patent/DE20320215U1/de not_active Expired - Lifetime
  • 2003-10-16 US US10/531,836 patent/US7392693B2/en not_active Expired - Lifetime
  • 2003-10-16 EP EP03776799A patent/EP1552262A1/de not_active Withdrawn
  • 2003-10-16 WO PCT/DE2003/003465 patent/WO2004038355A1/de not_active Ceased
  • 2003-10-16 AU AU2003286096A patent/AU2003286096A1/en not_active Abandoned
  • 2003-10-16 JP JP2005501498A patent/JP4616769B2/ja not_active Expired - Fee Related

Patent Citations (6)

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