Classifications

• • 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
  • G01M17/02—Tyres
  • G01M17/022—Tyres the tyre co-operating with rotatable rolls
• • 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
  • G01M17/02—Tyres
• • 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
  • G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
• • 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
  • G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
  • G01L5/167—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using piezoelectric means
• • 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
  • G01L5/20—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring wheel side-thrust

Definitions

• the present invention relates to a test stand for testing vehicle tires according to the preamble of claim 1 and a method for testing vehicle tires according to the preamble of claim 9.
• Low Speed Uniformity test stands for determining the synchronization properties of vehicle tires are known.
• the synchronization properties in low-speed uniformity measurements primarily include the recording and evaluation of forces when the vehicle tire rolls comparatively slowly, for example at around 60 tire revolutions per minute.
• the commonly used test stands each have two biaxially designed force transducers for a vehicle tire to be tested, each of which can detect forces along two spatial directions. This can lead to an undefined crosstalk of forces between the two force detection channels assigned to the different spatial directions.
• a wheel force dynamometer for measuring tire forces is known from DE 10260000 B4, a vehicle wheel being able to be fastened to a wheel axle which is mounted in a hollow shaft via roller bearings.
• the hollow shaft is hydrostatically supported in a housing that is fixed to the frame.
• the wheel force dynamometer comprises at least two uniaxial force sensors assigned to the wheel axle, a first force sensor being provided for detecting a wheel load component and a second force sensor being provided for detecting a tangential force component.
• the force sensors are not coupled to one another.
• the invention relates to a test stand for testing vehicle tires, comprising a running drum on a drum axis and force transducers for detecting a radial force acting on the drum axis and a lateral force acting on the drum axis.
• the test stand according to the invention is characterized in that the test stand comprises three uniaxial force transducers, a first and a second force transducer being arranged to detect the radial force, a third force transducer being arranged to detect the lateral force, and the first force transducer and the third force transducer are coupled.
• a test stand for testing vehicle tires which comprises a running drum arranged on a drum axle.
• the drum represents the rolling surface for the vehicle tires to be tested.
• Radial forces and lateral forces that act between the drum and the vehicle to be tested are recorded by three load cells on the test bench.
• the three force transducers are three each uniaxial force transducers, ie force transducers that are designed to detect forces exclusively along one spatial direction. This has the advantage, for example, that the force transducer can be calibrated individually.
• the force sensors can, for example, be force sensors that work according to the piezo principle.
• Two of the force transducers namely the first and the second force transducer, are arranged on the test stand or are in contact with the drum axis in such a way that they can detect a radial force acting on the drum axis.
• the third force transducer is arranged on the test stand or is in contact with the drum axis in such a way that it can detect a lateral force acting on the drum axis.
• the first force transducer which can detect a radial force
• the third force transducer which can detect a lateral force
• the additional information obtained through the specifically set crosstalk can be used, for example, to computationally compensate for temperature influences on the measurement data of the first force sensor.
• test stand according to the invention allows a largely exact Kalibrie tion of each force transducer and a calibration of the crosstalk from the first force transducer to the third force transducer and vice versa.
• the first force transducer is assigned to a first axial end of the drum axis or is in contact with a first axial end of the drum axis and that the second force transducer is assigned to a second axial end of the drum axis or with a second axial end of the Drum axis is in contact.
• radial forces acting on the running drum can be recorded and recorded particularly reliably.
• the radial forces usually arise in that the vehicle tire to be tested is brought into contact with the tread drum with a predeterminable application of force in the radial direction, that is to say with the radial force.
• the first force transducer is in contact with a first axial end of the drum axle via a first coupling link and that the second force transducer is in contact with a second axial end of the drum axle via a second coupling link.
• the first coupling link is in contact with the first axial end of the drum axis by means of releasable screw connections and that the second coupling arm is in contact with the second axial end of the drum axis by means of releasable screw connections.
• the third force transducer is in contact with the first axial de of the drum axis via a coupling rod.
• the coupling rod is preferably arranged at the first axial end of the drum axis coaxially to the drum axis. This arrangement enables a largely optimal transfer of the lateral force acting on the drum axis to the third force transducer.
• the third force transducer is in contact with the first coupling link via the coupling rod.
• the coupling link preferably has an opening through which the coupling rod is guided largely free of play.
• the coupling stage can be in contact with the first axial end on the one hand and with the coupling link on the other hand without play and thus without the occurrence of hysteresis effects.
• the test stand is designed to set a defined over-speaking of the radial force on the third force transducer by means of a predeterminable length and / or a predeterminable rigidity of the coupling rod.
• the defined crosstalk is preferably set additionally by a predeterminable length and / or a predeterminable rigidity of the first coupling link.
• the test stand is designed to set a fall of the running drum by means of first and / or second coupling links of different lengths. Over a length of the coupling arm, in particular over a different length of the first coupling arm and the second coupling arm, a fall of the drum axis relative to the axis of rotation of the vehicle tire to be tested can thus be set in a simple manner. This has the advantage that the vehicle wheel to be tested can be subjected to different test scenarios in a simple manner.
• the test stand is designed to set a skew direction of the running drum by offsetting the first and / or the second force transducer. This results in the advantage that a skewing direction of the drum axis with respect to an axis of rotation of the vehicle tire to be tested can be set in a simple manner.
• the invention further relates to a method for testing vehicle tires, a radial force acting on a drum axis of a running drum and a lateral force acting on the drum axis of the running drum being detected by means of force transducers.
• the method according to the invention is characterized in that the radial force is detected by means of a first and a second uniaxial force transducer, the lateral force being detected by means of a third uniaxial force transducer and a defined crosstalk of the radial force to the third force transducer being set.
• the method according to the invention thus describes a test of a vehicle tire in a test stand according to the invention, which leads to the advantages already described.
• the first force transducer and / or the second force transducer and / or the third force transducer are individually calibrated. This has the advantage that e.g.
• Fig. 1 exemplarily and schematically a possible embodiment of a test stand according to the invention
• Fig. 2 by way of example and schematically a possible embodiment of a Kop pelungslenkers and
• FIG. 3 an example and schematically shows a drum axis of a test stand according to the invention.
• the test stand 1 shows, by way of example and schematically, a possible embodiment of a test stand 1 according to the invention.
• the test stand 1 comprises a running drum 2, which is arranged on a drum axis 3.
• the drum axis 3 has three translational and three rotational degrees of freedom of movement.
• a vehicle tire to be tested (not shown in FIG. 1) rolls on a surface of the drum 2 during its test.
• the test stand 1 comprises a first force transducer 4, a second force transducer 5 and a third force transducer 6.
• the first force transducer 4 is in contact with a first axial end 3 'of the drum axis 3 via a first coupling link 7 and the second force transducer 5 is in contact with a second coupling link 8 with a second axial end 3 ′′ of the drum axis 3 in contact.
• the first coupling arm 7 is in contact with the first axial end 3 'of the drum axis 3 by means of releasable screw connections and the second coupling arm 8 is in contact with the second axial end 3 ′′ of the drum axis 3 by means of releasable screw connections.
• first and second coupling links 7, 8 Since the connection between the first and second coupling links 7, 8 with the first th or second axial end 3 ', 3 "is therefore backlash-free, hysteresis effects that falsify the test can be avoided. Due to the arrangement shown of the first force transducer 4 and the second force transducer 5 at the first axial end 3 ′ and at the second axial end 3 ′′, these can each detect a radial force acting on the drum axis 3. Any tangential force that may occur on the drum 2 can also be detected via the flat cuboid-shaped coupling rods 7, 8, in particular in connection with the coupling rod 12 and the third force transducer 6.
• the third force transducer 6 is arranged at right angles to the first force transducer 4 and is in contact with the first axial end 3 ′ of the drum axis 3 via a coupling rod 12.
• the third force transducer 6 can thus detect a lateral force acting on the drum axis 3.
• the third force transducer 6 is also in contact with the first force transducer 4 via the coupling rod 9 and the first coupling link 7, so that targeted crosstalk from the first force transducer 4 to the third force transducer 6 and vice versa can take place. Due to the arrangement of the third Kraftaufneh mers 6 shown, it can detect a lateral force acting on the drum axis 3.
• the first force transducer 4, the second force transducer 5 and the third force transducer 6 are each designed as uniaxial force transducers, whereby they are comparatively inexpensive and, above all, can be calibrated comparatively easily. Undesired and undefined crosstalk between force detection channels of a multi-axis force transducer can thus be avoided from the outset.
• the test stand shown in FIG. 1 is suspended from a support frame 13.
• Fig. 2 shows an example and schematically a possible embodiment of a Kop pelungslenkers 7, as it is preferably used for a test stand according to the invention.
• the coupling link 7 has a series of bores 9 at both axial ends, which are used to receive screws 10 to attach the coupling link by means of screw connections on the force transducer 4 and on the first axial end 3 'of the drum axle 3 (not shown in FIG Fig. 2) to be releasably strengthened.
• the coupling link 7 has a central opening 11 through which the coupling rod 12 can be passed, in order to enable a targeted talk from the first force transducer 4 to the third force transducer 6 and vice versa.
• the strength of the crosstalk depends on the length and the rigidity of both the coupling rod 12 and the length and rigidity of the coupling link 7.
• Fig. 3 shows by way of example and schematically a drum axis 3 of a test stand according to the invention.
• the running drum 2 is also indicated by dashed lines.
• An arrow 14 represents a lateral force acting on the drum axis, which can be detected by the third force transducer via the coupling rod 12.
• Arrows 15, 15 'and 15 ′′ represent radial forces which can be detected by the first and second force transducers 4, 5 via the first and second coupling links 6, 7. Since the arrows 15, 15 ′, 15 ′′ or the assigned radial forces act on the drum axis 3 at three different positions, a torque also arises which also acts on the drum axis 3.
• This torque can in turn be recorded by the first and second force transducers 4, 5 via the first and second coupling links 6, 7 and, due to the coupling of the first coupling link 6 with the coupling rod 12, also by the third force transducer 6.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=72964714

Family Applications (1)

Country Status (5)

Family Cites Families (7)

• 2019
  • 2019-10-22 DE DE102019216215.0A patent/DE102019216215A1/de active Pending
• 2020
  • 2020-10-20 WO PCT/EP2020/079493 patent/WO2021078734A1/de active Application Filing
  • 2020-10-20 EP EP20793676.6A patent/EP4048998A1/de not_active Withdrawn
  • 2020-10-20 CN CN202080073431.4A patent/CN114556073A/zh active Pending
  • 2020-10-20 US US17/766,649 patent/US20240060859A1/en active Pending

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