Multi-component measuring disc wheel

A multi-component measuring disc wheel coupled to vehicles through wheel fastening bolts comprising:

• a rim ring, having a rim flange, carrying a vehicle tire and an angle-section ring fastened in the rim ring, the angle-section ring having an auxiliary flange which is at right angles to the angle section ring axis and is located axially approximately at the position of the rim flange of the rim ring facing away from the vehicle, an inner edge of the auxiliary flange having a larger diameter than an outer circle formed around the wheel fastening bolts,
• an annular measuring disc;
• a plurality of stud bolts arranged parallel to the axis and having a circular cross-section, said stud bolts holding the annular measuring disc at a distance from the auxiliary flange on the side of the multi-component measuring disc wheel facing away from the vehicle, an inner edge of the measuring disc having a smaller diameter than the inner edge of the auxiliary flange and having a larger diameter than the outer circle formed around the wheel fastening bolts;
• wherein the plurality of stud bolts are equipped with strain gauges and are designed to be substantially identical to one another and to act as axial measuring cross-sections, the plurality of stud bolts are evenly distributed on a common pitch circle, are fastened in a torsionally stiff manner both in the measuring disc and in the auxiliary flange and are positively secured against rotation;
• wherein the measuring disc has a number of radially extending measuring webs, having opposing flat sides, which can be divided by four without any remainder, the measuring webs extend between an outer ring of the measuring disc closed in the peripheral direction and a closed inner ring of the measuring disc, are designed to be substantially identical to one another and are also equipped with strain gauges,
• a pot-shaped wheel adaptor bolted axially to the inner edge of the measuring disc, the wheel adaptor compensates for the difference between the axial distance of the measuring disc and a normal axial position of a bolt-on flange of a conventional wheel disc of a conventional vehicle wheel, the wheel adaptor matches in a bolt-on region the bolt-on flange of the conventional wheel disc,
• a rotating to stationary signal transmission device, having a rotating and a stationary part, located at least partially within or on the pot-shaped wheel adaptor and rotatably mounted in or on the wheel adaptor;
• and
• a rotational position sensor, having a stationary part, for the multi-component measuring disc wheel, the stationary part of the signal transmission device and of the rotational position sensor being fixed in a defined position on the vehicle in the rotational direction of the multi-component measuring disc wheel by a linkage compensating for at least one of the suspension and steering motions of the multi-component measuring disc wheel;
• wherein the strain gauges applied to the axial stud bolts and the radial measuring webs are applied in such a position in each case and with respect to their alignment and are connected into associated electrical measuring bridge circuits in such a manner that isolated electrical signals can be obtained with respect to the following components:
• vertically directed wheel loads extending radially through the wheel center,
• horizontally directed longitudinal forces, extending radially through the wheel center,
• eccentric side forces acting on a wheel contact surface and directed transversely to the plane of the wheel,
• eccentric braking forces directed parallel to the rolling direction of the vehicle wheel,
• wherein the radially extending measuring webs of the measuring disc are used for determining the forces acting eccentrically at the wheel contact surface of the multi-component measuring disc wheel, such as the braking force and the side force, and are equipped in two different ways with a number of the strain gauges;
• whereby, for isolated recording of the braking force directed parallel to the plane of the wheel, a peripheral bending load on the measuring webs is determined and, in consequence, the strain gauges are applied in each case to the opposing flat sides in the peripheral direction of at least some of the measuring webs at the radial position of maximum bending load, wherein the strain gauges are aligned with their measurement sensitivity parallel to the side edges and the measuring webs selected for this purpose are evenly distributed over the periphery of the measuring disc, and
• whereby, for isolated recording of the side force directed transversely to the plane of the wheel, an axial shear load on the measuring webs is determined and, in consequence, shear strain gauges are applied in each case to the opposing flat sides in the peripheral direction of all the measuring webs, the shear strain gauges being arranged crosswise and extending with their measurement sensitivity at an angle of 45.degree. to the side lines,
• wherein the stud bolts are used for determining a total resultant of the components directed parallel to the plane of the wheel, namely the vertical wheel load, the horizontal longitudinal force and the braking force, it being possible to resolve the total resultant into its vertical component corresponding to the wheel load and into its horizontal component corresponding in magnitude to the sum of the longitudinal force and the known braking force so that the wheel load and the longitudinal force can be determined, and
• wherein for the elimination by measurement techniques of the effect of the side force and of the torque effect of the braking force, all the stud bolts are equipped with shear strain gauges in a non-axisymmetrical manner at four peripheral regions which have the same cartesian location in each case in reference to a selected peripheral position of the multi-component measuring disc wheel which can be continually detected by means of the rotational position sensor, it being possible to determine the total resultant quoted in terms of magnitude and, in reference to the selected peripheral position, radial direction by these shear strain gauges.