RU2405708C1 - Device for continuous automatic toe-in control - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to automotive industry and can be used for automatic toe-in control in motion. Proposed device comprises controlled wheels with bearings, axles with rotary cams, sleeves, and sleeve and ring fastening nuts, strain gage, power supplies, electromagnetic coil, distributor, working fluid vessel, pump and transverse tie rod with reversing mechanism. Strain gages secured on wheel face surface represents transducers of rods lateral reaction and are connected in bridge circuit with power supply and electromagnetic coil. Electromagnetic oil core is coupled with working fluid control valve spool communicated with working fluid vessel and hydraulic cylinder of reversing mechanism intended for adjusting transverse steering link length. Inner and outer rings wit strain gages fitted thereon feature equal sizes. Outer rings are fitted on wheel axle via spacers with their outer surface smaller diametres equal those of ring holes, while their larger diametres equal OD of the sleeve inner end. Spacer ID equals diametre of wheel axle outer end diametre.

EFFECT: higher sensitivity and accuracy of automatic toe-in adjustment in motion.

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Description

The proposed device relates to vehicles and can be used to provide automatic regulation of the convergence of the steered wheels of the car during movement.

A device for automatically controlling the convergence of the steered wheels in the process of driving, comprising sensors of the side reaction of the road acting on the steered wheels, which are piezosensors in the form of washers mounted on the axles of the steered wheels and electrically connected by a bridge circuit, a reversible mechanism for changing the working length of the transverse steering rod and a control system for the specified mechanism, electrically connected with the sensors of the side reaction of the road (RF Patent No. 49257, November 10, 2005, Bull. No. 31).

The disadvantages of this device are low sensitivity, accuracy and reliability, because The lateral reaction sensors of the road also respond to axial forces arising in the cages of the tapered wheel bearings from vertical loads.

Closest to the proposed device is a device for continuous automatic regulation of the convergence of the steered wheels in motion, containing sensors of lateral reactions of the road, which are strain gauges electrically connected on a bridge circuit mounted on the end surfaces of the rings mounted on the axes of the rotary axles on which bearings are mounted on the bushings steered wheels, an electric signal amplifier, a reversing mechanism for changing the working length of the transverse steering rod and the control system ION said mechanism is electrically connected to the sensors of the road side reactions (Russian Patent №2348913, 10.03.2009, Bul. №7).

The disadvantage of this device is that the inner and outer rings on which the load cells are installed have different sizes, due to the unequal diameters of the wheel axis at the points of installation of the rings. Therefore, with the same deviation of the steering wheel convergence from the right one in the positive or negative direction and, consequently, the steering wheels are affected by the same external or internal lateral reactions of the road, the inner and outer rings and load cells will have different deformation and, therefore, different imbalance of the electric bridge, which reduces the accuracy of regulation. And the elimination of this drawback necessitates the use of various load cells for the inner and outer rings (in size, resistance and sensitivity), the introduction of additional control devices in the bridge, which complicates the design, adjustment of the bridge, reduces the reliability of the device, the accuracy of regulation.

The technical result of the proposed device for continuous automatic regulation of the convergence of the steered wheels of the car in motion is to increase the accuracy of regulation and reliability of the device.

The specified technical result is achieved by the fact that in the device for continuous automatic regulation of the convergence of the steered wheels of the car in motion, containing steered wheels with bearings, axles with knuckles, bushings, rings and washers with nuts for their fastening on the axles, strain gauges connected to an electric bridge, which are sensors of the side reactions of the road, an electric power source, an electric signal amplifier, an electromagnetic coil, a switchgear, a container with a working fluid, a pump, transverse thrust with a reversible mechanism, the inner and outer rings on which the load cells are mounted have the same dimensions, and the outer rings are mounted on the axles of the wheels through spacers, in which the smaller diameters of the outer surfaces are equal to the diameters of the holes in the rings, large diameters of the outer surfaces are equal to the outer diameter of the inner the end of the sleeve, and the inner diameter of the spacers is equal to the diameter of the outer end of the wheel axis.

The figure 1 shows a General diagram of the proposed device; in figure 2 - the axis of the steered wheel assembly.

The proposed device includes steered wheels 1 installed through bearings and bushings 2 on the axles 3, on which the same outer and inner rings 4 with load cells 5 are also installed, which are sensors of the side reactions of the road. A spacer 6 is installed between the outer ring and the wheel axis. Strain gauges 5 are mounted on the end surfaces of the rings 4, have the same electrical resistance and are connected according to the bridge circuit 7. Points A and B of the electric bridge 7 are connected to the power supply 8, and points C and D are connected to an electromagnetic coil 9, the core of which is rigidly connected to the spool 10 of the distributor 11 of the working fluid flow. The device also contains a tank 12, a pump 13, a reversing mechanism (hydraulic cylinder) 14 for changing the working length of the steering tie rod 15 and an electric signal amplifier 16. Rings 4 with strain gauges 5, spacers 6, electric bridge 7, power supply 8, electromagnetic coil 9 and distribution the fluid flow device 11 and the electric signal amplifier 16 form a control system for the reversing mechanism 14 for changing the working length of the steering tie rod 15. The clearance in the bearings 17 and 18 (the outer cage in figure 2 is not rendered) of the steered wheels is regulated by a nut 19 with a washer 20. The sleeve 2, the inner and outer rings 4 and the spacer 6 are fixed on the axle 3 of the steered wheel with a nut 21 with a washer 22.

The device operates as follows.

With the rectilinear movement of the car and the correct convergence of the steered wheels, there are no lateral reactions of the road to these wheels, and the load cell resistances are equal to each other, so the voltage supplied from points C and D of the electric bridge 7 to the electromagnetic coil 9 is zero and the spool 10 of the switchgear 11 is in the central (neutral) position.

If the convergence to the positive or negative sides is deviated, the steered wheels 1 due to the lateral road reactions resulting from this through bearings, bushings 2, spacers 6 and rings 4 will act on the load cells 5 and change their electrical resistance. In this case, a voltage is applied between points C and D of the bridge 7, which is supplied to the electromagnetic coil 9. A current will flow through the coil, which will cause a magnetic flux moving the core of the coil 9 and the spool 10 of the switchgear 11 left or right, supplying the working fluid from the pump 13 to one or another cavity of the hydraulic cylinder (reversing mechanism) 14 changes the working length of the transverse steering rod 15, thereby changing its length and providing the required toe-in of the wheels 1.

Thus, the proposed device for continuous automatic regulation of the convergence of the steered wheels of the car in motion increases the accuracy of regulation, the reliability of the device and ensures the correct position of the steered wheels under various driving conditions (acceleration, rolling, braking), which helps to reduce resistance to movement, tire wear and fuel consumption .

Claims (1)

A device for continuous automatic regulation of the convergence of the steered wheels of the car in motion, comprising steered wheels mounted through bearings and bushings on the axles with rotary fists, outer and inner rings and washers with nuts for fastening the bushes and rings on the axles, strain gauges mounted on the end surfaces of the rings, which are sensors of the side reaction of the road and connected via a bridge circuit to a power source and to an electromagnetic coil, the core of which is rigidly connected to the spool the switchgear of the flow of the working fluid in communication with the reservoir for the working fluid, the pump and the hydraulic cylinder of the reversing mechanism for changing the working length of the steering tie rod, characterized in that the inner and outer rings on which the load cells are mounted have the same dimensions, and the outer rings are mounted on the axles of the wheels through spacers in which smaller diameters of the outer surfaces are equal to the diameters of the holes in the rings, large diameters of the outer surfaces are equal to the outer diameter of the inner gloss sleeve and the inner diameter of the spacers is equal to the diameter of the outer end of the wheel axle.

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