SU1307278A1 - Device for detecting and recording slip of pneumatic tyre protector elements with respect to support surface - Google Patents

Abstract

The invention relates to Hcnbita technology, in particular to devices for studying the processes of interaction of a pneumatic secret with a supporting surface. The objective is to extend the range of tire slippage measurements relative to the bearing surface and to enable testing under conditions close to operational conditions. The device contains a permanent magnet 1, built into the protector of the pneumatic Sh Fip.1

Description

tire 2 at point f, and a magnet movement detection system consisting of a base 4 rotating from an electric motor 7, on which two highly directional magnetic fields 5 and 6 are placed at an acute angle to each other, the axis of rotation Z – Z of the base is located on the bisector an acute angle at a distance A from the intersection point of the axes of the receivers 5 and 6 of the magnetic field, the base 4 being kinematically connected with the transducer 8 of its angle of rotation, and the receivers of the magnetic field and the transducer of the angle of rotation of the base ics measuring unit 10-16. When operating the device

The invention relates to testing equipment, in particular to devices for studying the processes of interaction of a pneumatic tire with a supporting surface.

The purpose of the invention is to expand the range of measurements of slippage of the tire relative to the bearing surface and to ensure the possibility of testing under conditions close to operational ones.

FIG. 1 shows a diagram of the device j in FIG. 2 - time diagrams of signals at certain points of the circuit; in fig. 3 is a diagram for determining the coordinates of the position of a slipping point of the tread of a pneumatic tire.

 The device (Fig. 1) consists of a tracking element in the form of a magnet 1 embedded in the tread of a pneumatic tire 2 at the point of interest. In the plane of the supporting surface 3, a base 4 is installed with sharply directed magnetic field receivers (e.g., flux-gap) 5 and 6 placed at an acute angle oi to each other. Base 4 is rotated at a constant angular velocity Q by means of a drive 7 ( for example, an electric motor), the axis of rotation of the base Z-Z is located in the electronic measurement unit receives electrical signals from the magnetic field receivers with an EMF maximum when the receiver axis coincides with the point (magnet). Simultaneously with the angle of rotation converter q, in the values of voltage, information is received about the angle of rotation of the base relative to the origin of the reference point, Calculated by the value of the angle A of the angle and the current value of the angle of rotation tf of the base corresponding to the signal from the first 5 and second b receivers magnetic field, the current coordinates of the point are determined, and through them the tire slip relative to the reference surface. 3 il.

on the distance A from the intersection point in the horizontal axes of the receivers on the acute angle bisector. Base 4 kinematically connected with

a rotation angle converter 8 (for example, a variable resistor) and a current collector 9 (for example, a brush). The sharply directed magnetic field receivers 5 and 6 are connected to the recorder.

10 (for example, by a light-beam oscilloscope) - by means of amplifiers 11 and 12, threshold elements 13 and 14 (for example, integrated comparators) and logic element 15, and the angle-of-rotation converter 6 of base 4 - amplifier 16.

The device works as follows.

When rolling a wheel with a pneumatic tire 2 with an angular velocity Q on the supporting surface 3, the tread elements, including points, slip (move 1bts) relative to the supporting surface. Together

with the tread element under study

slips relative to the support surface 3 and the magnet G built into it. When the base 4 rotates around the vertical axis Z - Z, an extremely short-wavelength emf (sig3J) is induced in the highly directional magnetic field 5 and 6 receivers located on it by the magnet 1.

and a and b), which is fed through the current collector 9 to the inputs of amplifiers 11 and 12. The maximum emf level reaches at the time of coincidence of the horizontal axis of the receiver (X.-B

for receiver 5 and for receiver 6) with the center of magnet 1 (point). The amplified signals from receivers 5 and 6 are converted into pulses of standard duration and amplitude using threshold devices 13 and 14, respectively, and are fed to the input of a logic element 15 consisting of OR-NOT elements, where they form a sequence of pulses (signal) input to B of the recorder 10. A signal proportional to the angle of rotation of the bases 4., from the angle of rotation converter 8 through the amplifier 16 is fed to the input B of the recorder 10 (signal g).

Thus, the signals of the receivers 5 and 6 are fixed on the carrier of the register 10 at the moment of coincidence of their axes (xj-B and Xg-b) with the center of the magnet 1 at the point (signal) and the current value of the angle of rotation of the base 4 from the reference point (signal ).

By knowing the values of A, about, /, ,, f, and taking into account that p / 3, - / J, it is possible to determine the rectangular coordinates of a point relative to the center Z at time t, a multiple of the period (T) of rotation of the base 4 - T 21G / with

 l

: r cos if

 оС А- coscf

R

- ui.

g

sin (f

oi-A sinif

Claims (1)

Formula invented shadows 20 25 A device for detecting the sweep of the tread elements f of the pneumatic tire relative to the support surface, comprising  About the element for installation in the tread, the system for recording the movement of the tracing element along the supporting surface. with the base, the base is installed with the possibility of rotation around the vertical axis from the drive, which is distinguished by the fact that, in order to expand the range of slip measurements and ensure the possibility of testing under conditions close to operational ones, the tracking element is made in the form of a magnet and the slip detection system is equipped with an electronic measuring unit and two highly directional magnetic field receivers located on the said base at an acute angle to each other, the axis of rotation is the base It is located at a distance from the intersection point of the horizontal axes of the receivers on the bisector of the aforementioned acute angle, while the base is kinematically connected with the transducer of its angle of rotation, and the receivers of the magnetic field and 35, a rotation angle transducer of the base is associated with said electronic measurement unit. Editor N.Shvydka Compiled by V.Ilina Tehred V.Kadar Proofreader A.Zimokosov Order 1622/40 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig.Z