UA71249A - Stand for selecting tire sets for vehicles - Google Patents

Abstract

The proposed stand for selecting tire sets for vehicles contains a frame, a drum with running-tracks, which is fitted to a shaft supported by bearings at the stand frame, a shaft for rotating tires to be tested, and a drive mechanism for the shaft for rotating tires. The shaft for rotating tires is supported by bearings at a rotary frame. The rotary frame is hinged to the stand frame, on one side, and is coupled with a loading unit on the other side. The loading unit is intended for loading tires to be tested and contains a dynamometric spring, a link, a hydraulic cylinder with a rod that is installed at the stand frame, and a device for metering the force acting on tested tires. The swing joint between the rotary frame and the stand frame is provided by a T-shaped pivoted support. The lower part of the pivoted support is coupled with the stand frame via a bearing. The rotary frame is fitted to the flange of the pivoted support. The rotary frame is coupled with the dynamometric spring by prismatic bushings so that the rotary frame can rotate relative to the axis of the pivoted support under the spring force. At the stand frame, the indicator of the spring displacement is provided. The rotation axis of the pivoted support of the rotary frame is in the plane that passes trough the line of the contact of the tires with the drum running-tracks. The tangent component of the force acting on the tires is determined from a specified equation.

Description

Description of the invention

The invention relates to the field of motor vehicle technology, in particular to equipment for packing tires, 2 installed in pairs on a motor vehicle at factories - manufacturers and in car operating organizations.

When equipping motor vehicles with tires that are mounted on hubs in pairs, their kinematic inconsistency almost always occurs, which consists in the difference in the kinematic rolling radii, which leads to the difference in the wheel speeds of the tread surfaces. And this leads to their free rolling on the 710 road surface to sliding, which is caused by the tangential load, since the kinematic radii become equal when the paired tires roll together. If paired tires work on the drive wheels, this leads to a difference in the tangential load of each tire. The latter leads to uneven wear of paired tires, worsens the traction of the most loaded tire with the road surface, and increases the risk of an accident when the road is slippery on turns. The difference in the kinematic rolling radii of tires occurs due to the difference in their diameters during the manufacture of the physical and mechanical parameters of the tread rubber, cord, tire pressure, as well as a number of other factors of a production and operational nature, which are not always subject to burning.

The difference in kinematic rolling radii also occurs when equipping with new tires of the same size and manufacturer. This shortcoming is manifested to an even greater degree when equipping vehicles at car dealerships with paired tires that have been in use and restored.

A known technical device (see Author's certificate OZ 1755093 M.Kl. z01M17/02, 1992), which contains two running drums connected to the drive, kinematically connected to each other by means of a clutch, tires installed with the possibility of vertical movement on the loading frame. At the same time, one of the tires is connected to the braking device, and the second - to the excitation mechanism of torsional periodic oscillations, and the diameters of the running drums and the standard sizes of the tested tires are made accordingly the same. 29 The main drawback of this technical solution is that it does not allow us to solve the "task of determining the tangential load of paired tires with different kinematic radii", since in it the load is transferred from one tire to the other in sequence. When the tires are installed in pairs, they are loaded in parallel. To a large extent, the device is devoid of the above-noted shortcomings (see

Declaration patent of Ukraine OA 2002010334 MPK7 501M17/02, 2002), which contains a frame on which two running drums are mounted on a 30 shaft in bearing supports, on which two tires, mounted rigidly on the shaft, are rolled. which swings on a common frame. The shaft, on which the wheels with tires are installed, is driven by the electric motor through a mechanical transmission. The radial load of the tire components is carried out by a hydraulic cylinder installed on the frame of the stand through a thrust with the help of a dynamometric spring. "--

One of the running drums is mounted rigidly on the shaft, and the other is movable in the tangential direction. Both 3o drums are kinematically connected to each other by means of an elastic element in the form of a helical spring in torsion. The tangential load of automobile tires is determined by the torsion angle of the elastic element.

This information is issued either using a stroboscopic device or using special electronic equipment. Such a constructive implementation is characterized by high complexity and duration "determining the tangential load of the assembled tires, which is due to the time for twisting C 50 of the elastic element - the spring, as well as not fully simulating the rolling of paired tires in operating conditions, since c one of the tires has the ability to rotate relative to the second z" The purpose of the present invention is to develop a design of a stand for completing tires of motor vehicles installed in pairs, in which the rolling conditions of the tires are as close as possible to road ones, and the design of the tire tangential load meter is extremely simplified. 45 The problem set by us is solved by installing a solid drum in bearing supports on the 7th frame of the stand, frictionally connected to the component tires, rigidly installed on the shaft with a drive in - bearing supports on the rotary frame. The rotating frame on one side is installed so that it swings on

T-shaped bracket, rotatable on the frame of the stand. On the other hand, the rotary frame is loaded by the hydraulic cylinder installed on the stand frame through the traction and dynamometric spring. On the same side, the rotary frame 20 with prismatic stops on its bracket covers the band dynamometric spring in a plane perpendicular to the rolling plane of the rotary frame. The deformation of this spring is regulated by the displacement indicator. At the same time, the rolling axis of the rotary frame and the prismatic stops are in a common plane with a tangent that passes through the point of contact of the treadmills and tires that are completed.

The cause-and-effect relationship between the set of essential features and the technical result that is achieved is that the tires of the drive wheels are fixed rigidly on the common shaft with the drive on the rotary frame, in. fixed so that it swings on a T-bracket mounted pivoting on the frame. The second end of the rotary frame is kinematically connected to the loading device, and the prismatic stops on the bracket covers the band dynamometric spring in a plane perpendicular to the rolling plane of the rotary frame. At the same time, the rolling axis of the rotary frame and the prismatic stops are in a common plane that passes through the 60 point of contact between the tire and the drum.

During the operation of the stand, the tangential load of tires with different kinematic radii is determined by the ratio of the turning moment acting on the turning frame to the distance between the centers of the tire tracks. And the turning moment is determined by the product of the force perceived by the band dynamometric spring at the distance between the prismatic stops and the rolling axis of the rotary frame. because All this allows you to make a set of tires on the stand according to the value of the tangential load, not exceeding the allowable by the selection method in rolling conditions as close as possible to road operating conditions, with a significant simplification of the construction of the tangential load measurement. This increases the durability of tires and the conditions of their safe operation, that is, to achieve the set technical result.

The proposed design of the tire assembly stand is illustrated by the following figures; Fig. 1 diagram of a stand for the assembly of motor vehicle tires. Side view; fig. 2 section A-A of the stand according to figure 1; Fig. C view B of Fig. 1. T-shaped bracket; Fig. 4 view B of Fig. 1. Measuring device for tangential tire load. 70 The stand for the assembly of paired tires contains a frame 1, on which a shaft 2 with a continuous drum 3 frictionally interacting with tires 4 and 5 under test, fixed rigidly on a shaft 6 with a drive 7 on a rotary ramp 8, is mounted in bearing supports. Rotary frame 8 on one side is fixed so that it swings on

The T-shaped bracket 9, which is rotatably fixed in the bearing supports on the frame 1 of the stand. On the other side, the rotary frame 8 is connected to the loading device, made in the form of a hydraulic cylinder 10 on the frame 1 of the stand, /5 connected to it by means of a rod 11 and a dynamometric spring 12. On the same side, on the bracket 13 of the rotary frame 8 are installed prismatic stops 14, covering the band dynamometric spring 15 in a plane perpendicular to the rolling plane of the rotary frame 8. The deformation of this band dynamometric spring 15 is registered by the displacement indicator 16 on the frame 1 of the stand. At the same time, the rolling axis of the rotary frame 8 and the prismatic stops 14 is in the common plane, tangent to the places of frictional contact of the tires 4 and 5, which are complete, and the drum 3.

To determine the kinematic compatibility of tires 4 and 5, which are completed, they are installed on a stand. Load the rotary frame 8 with a hydraulic cylinder 10 controlled by a dynamometric spring 12 and turn on the drive 7 of the stand. According to the amount of deformation of the band dynamometric spring 15, which is registered by the movement indicator 16, the amount of the turning moment acting on the rotary frame 8 is determined. The tangential load P of the assembled tires is determined depending on:

EsheRpruzhi-Yshch, "where: Epruz - forces perceived by the strip dynamometric spring according to the indicators of the movement indicator 15;

And - the distance between the rolling axis of the rotary frame and the middle of the dynamometric strip spring 15; Gee! z Ish - the distance between the middles of the running tracks of tires 4 and 5, which are completed.

The selection of pairs of tires that are installed in pairs on a motor vehicle is carried out according to the magnitude of the tangential load, without exceeding the permissible value by the selection method. with

The application of the proposed stand design allows you to complete tires according to the assumed tangential load, will contribute to reducing the degree of their wear and the conditions of safe operation of tires - z5 when driving them in ice on a wet road surface, during turns, and also reduces energy consumption on wheel drive of MU motor vehicles

VE A and / o cho « 400.0 I (8) G- shi

TSO h 7

And" la ha

Fig1

AA

-i -Zhk de v iz 50 - vom 3e) 2 3

Fig2

IN

-t 60! Fig. With b5 g what - ! /5--- and

Fig. 4

Claims (1)

The formula of the invention Stand for the assembly of tires of motor vehicles, which contains a frame and a shaft mounted on it in 72 bearing supports with cylindrical running tracks interacting with tires fixed on the shaft rigidly in bearing supports with a drive on a rotary frame, which is hinged on one side with connected to the frame, and from the second - to the loading device, made in the form of a dynamometric spring, a rod and a hydraulic cylinder connected to the rod, installed on the frame of the stand, and a measuring device for the tangential load of tires, which is distinguished by the fact that it has running tracks for tires are made in the form of a solid drum, the hinge of the rotary frame is made in the form of a T-shaped bracket, mounted on the frame in a bearing support in a rotatable manner, and its connection with the rotary frame is made in a swinging manner, the other end of the rotary frame covers the band dynamometric spring using prismatic stops on its bracket in a plane perpendicular to the rolling plane of the rotating frame, the deformation of which is registered by the movement indicator on the stand frame, while the axis of rotation of the rotating frame and prismatic stops on its lever is located on the common plane tangential to the places of frictional contact of the drum and tires, which are "completed", and the tangential load of the tires is determined by the dependence - where Би - Erzhi Tr Epruz - The force perceived by the strip dynamometric spring according to the indicator; (o) And - the distance between the rolling axis of the rotary frame and the middle of the dynamometric strip spring; « And 7 the distance between the middles of the running tracks of the completed tires. c Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated circuits", 2004, M 11, 15.11.2004. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. - - and? -i - ime) sh» 3e) 60 b5