SU1716304A1 - Stand for checking front wheels alignment - Google Patents

Abstract

The invention relates to a measurement technique and can be used in road transport enterprises and service stations to determine the convergence of steering wheels of a vehicle. The aim of the invention is to improve the performance of wheel alignment determination; taking measurements while the vehicle is moving. When determining the convergence of the steering wheels, the vehicle passes through the plates 1 and 2 so that the symmetry planes of the wheels coincide with the longitudinal axes of the plates. In the contact zone of the tires, the lateral forces create boms, turning plates relative to shafts 3 and 4 and deform the strain gages 6 and 7. At the same time, from the outputs of the strain gages 8 and 9, the signals arrive at the comparison circuit 10. When the signals at the output of the circuit 10 are equal, a pulse is formed that closes the key 11. In this case, the signal from the output of the strain gauge 9 is fed to the memory circuit 12 and the recording unit 13, where the value of the lateral force at the controlled wheels is fixed, which determines the convergence of the controlled wheels . 2 Il. (L Och 00 about

Description

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The invention relates to a measurement technique, in particular, to stands for checking the convergence of the steered wheels of a vehicle, and can be used in road transport enterprises and at service stations.

A stand for determining the convergence of the controlled wheels of a vehicle, comprising base drums mounted on a lever mechanism and a wheel convergence meter, is known.

The disadvantage of this stand is low productivity due to the need to stop the vehicle during the measurement process.

A stand for determining the convergence of the controlled wheels of a vehicle is known, comprising a base, basic supports for accommodating the controlled wheels mounted on the base of the displacement sensors of the supports, a normally open switch connected to the sensors, the control input of which is connected to the output comparison circuits, and the information input with the output of one of the sensors, the memory circuit connected to the key output and the recording unit connected to the memory circuit output.

A disadvantage of the known test bench is the low diagnostic performance associated with the necessity to stop the vehicle during the measurement process.

The purpose of the invention is to improve the performance of wheel alignment.

The goal is achieved by the fact that in the test bench for determining the convergence of the steerable wheels of the vehicle, which contains the base, the base supports, designed for placing the steerable wheels on them, fixed on the base of the movement sensors of the supports, normally connected to the sensors an open key, the control and information inputs of which are connected respectively to the outputs of the comparison circuit and one of the sensors, the memory circuit connected to the output of the key and connected to the output of the memory circuit The recording unit, each of the supports, is made in the form of a plate, mounted on a rotary shaft, the axis of which is perpendicular to the working surface of the plate and intersects with its longitudinal axis of symmetry, the axes of the shafts are located on opposite ends of the corresponding plates, and

Each sensor is made in the form of a strainer mounted on a plate so that its axis of symmetry lies in the same plane with the axis of the corresponding shaft perpendicular to it.

FIG. 1 shows a stand for determining the convergence of the steered wheels of a vehicle; in fig. 2 is a section A-A in FIG. one.

The stand for determining the convergence of the steerable wheels of the vehicle contains plates 1 and 2 for placing the steerable wheels on them, cantilever-mounted on rotary shafts 3 and 4 mounted on the base 5. The axes of symmetry of the shafts 3 and 4 are perpendicular to the working surfaces of the plates 1 and 2 intersect with the longitudinal axes of symmetry of the respective plates 1 and 2 and are located at their opposite ends. On plates 1 and 2, elastic beams 6 and 7 are fixed, the axes of symmetry of which lie in the same plane with the axes of the corresponding shafts 3 and 4 perpendicular to them. On elastic beams 6 and 7, strain gauges 8 and 9 are pasted, the outputs of which are connected to the inputs of the comparison circuit 10. The output of the comparison circuit 10 is connected to the control input of the normally open key 11, whose information input is connected to the output of the strain gauge 9, and the output via the memory circuit 12 to the recording unit 13.

The stand works as follows.

The vehicle driven wheels travels in a straight line direction through plates 1 and 2 so that the middle of the treadmills of the wheels coincide with the longitudinal axes of the respective plates 1 and 2. At the same time, lateral forces appear in the contact area of the tires of the steered wheels with plates 1 and 2 equal in magnitude and oppositely directed (condition of linear motion), which create moments, turning plates 1 and 2 relative to the axes of the respective shafts 3 and 4. At the same time, elastic beams 6 and 7 are deformed and create moments resistivity rotation plates 1 and 2. Deformations of the beams 6 and 7 are received in strain gages 8 and 9, the signals from the outputs of which are fed to the comparison circuit 10. At the moment of coincidence of the line of action of the lateral forces on the driven wheels with a straight line, perpendicular to the direction of movement of the vehicle and equidistant from the axles of the shafts 3 and 4, the moments turning plates 1 and 2 perceived by elastic beams b and 7, therefore, the strain gages 8 and 9, equal to each other and at the output of the comparison circuit 10, a voltage pulse appears sufficient to short-circuit the switch 11. At the same time, the voltage from the output of the strain gauge 9 is proportional to the product of the lateral force equal to o and the left wheel, by a fixed amount equal to half the distance in the direction of movement of the vehicle between the axles of shafts 3 and 4 of plates 1 and 2, goes to the memory circuit 12 and the recording unit 13, showing the magnitude of the lateral force on the driven wheels .

The process of determining the convergence of the controlled wheels of the vehicle is carried out without stopping the latter, which significantly reduces the time for performing control operations, increasing the productivity of the stand.

Claims (1)

Claims of the invention A stand for determining the convergence of the steerable wheels of a vehicle, comprising a base, base supports to be placed on them control wheels, based on the movement sensors of supports, connected to the comparison circuit sensors, normally open key, the control and information inputs of which are connected respectively to the outputs of the comparison circuit and one of the sensors, connected to the output of the key memory circuit and connected to the output of the memory circuit a recording unit, characterized in that. in order to improve the performance of wheel alignment, each of the supports is made in the form of a plate, cantilever mounted on a rotary shaft, the axis of which is perpendicular to the working surface of the plate and intersects with its longitudinal axis of symmetry, the axes of the shafts are located at opposite ends of the respective plates, and each sensor is made in the form of a strain gauge with glued strain gauges attached to the plate so that its axis of symmetry lies in the same plane with the axis of the corresponding shaft perpendicular to it. wk WOOOOC V V4X 777 777 777 777 777 777 777 777 777 777 Adl FIG. 2 7,777,77777.