RU2392158C1 - Device for continuous control of automotive wheels toe-in in motion - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: proposed device comprises controlled wheels with bearings, sleeves, washers, axles, strain gages, power supply, solenoid, distributing device, working fluid tank, pump and transverse link with reversing mechanism. Strain gages represent road lateral reaction pickups connected in bridge circuit with power supply and solenoid. Solenoid armature is connected with working fluid control valve actuator communicated with working fluid tank, pump and hydraulic cylinder of reversing mechanism that controls operating length of steering transverse link. Inner collars of flange outer edges are skewed from inside and outer face surfaces of said collars are separated from collars of wheel hub inner bearings by radial circular groove.

EFFECT: higher reliability, sensitivity and accuracy.

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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 disadvantage of this device is the 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 automatically controlling the convergence of the steered wheels during movement, containing side-reaction sensors of the road, which are strain gauges mounted on the end surfaces of the shoulders of the bushings mounted on the axes of the rotary trunnions on which the bearings of the steered wheels are mounted and electrically connected on a bridge circuit, an electric signal amplifier, a reversing mechanism for changing the working length of the transverse steering link and a control system the use of this mechanism, electrically connected with the sensors of the side reaction of the road (RF Patent No. 2309867, 10.11.2007, bull. No. 31).

The disadvantage of this device is the lack of sensitivity and accuracy due to minor deformations of the inner flanges of the bushings under the influence of side reactions of the road due to the significantly large geometric dimensions of these flanges.

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 sensitivity and accuracy.

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, bushings with collars, strain gauges connected to an electric bridge, which are sensors of the side reaction of the road, axles, power source, electric amplifier signal, electromagnetic coil, switchgear, reservoir with working fluid, pump, transverse thrust with reversing mechanism, internal collar The bushings are tapered at the outer ends from the inside and the outer end surfaces of the inner ends of these flanges are separated from the flanges of the inner race of the inner wheel hub bearings by a radial annular groove, which increases the design sensitivity and accuracy.

Figure 1 shows a General diagram of the proposed device; figure 2 - the axis of the steered wheel assembly (in a plan view the wheel axle, bearings, nut and washer are not shown).

The proposed device includes steered wheels 1 mounted through bearings, mounted on bushings 2 with flanges 3 (inner flanges have bevels 4 on their outer ends), on axles 5. Strain gauges 6 (electric sensors of the side reaction of the road) are fixed on the end surfaces of the flanges bushings, 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 through the electric signal amplifier 9, with electromagnetic a coil 10, the core of which is rigidly connected to the spool 11 of the switchgear 12 of the working fluid flow. The device also contains a tank 13, a pump 14 and a reverse mechanism for changing the working length of the transverse steering rod (hydraulic cylinder) 15. Strain gages 6, an electric bridge 7, a power supply 8, an electric signal amplifier 9, an electromagnetic coil 10 and a switchgear 11 form a reversing mechanism control system 14 changes in the working length of the tie rod 16.

The clearance in the bearings (inner race 17, rollers 18, outer race not shown) of the steered wheels is regulated by a nut 19 with a washer. The sleeve 2 is fixed on the axis 5 of the steered wheels with a nut 20 with a washer. The flanges of the inner race of the inner bearings of the wheel hub are separated from the outer end surfaces of the inner ends of the flanges of the radial annular groove 21.

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 through the electric signal amplifier 9 to the electromagnetic coil 10 is zero and the spool 11 of the switchgear 12 is in a central (neutral) position.

When the convergence to the positive or negative side deviates, the steered wheels 1 due to lateral reactions of the road through the sleeves 2 with shoulders 3 will act on the load cells 6 and change their electrical resistance. In this case, a voltage appears between points C and D of the bridge 7, which is supplied through the amplifier of the electric signal 9 to the electromagnetic coil 10. The current in the coil 10 will cause a magnetic flux moving the core of the coil 10 and the spool 11 of the switchgear 12 left or right, providing a working fluid supply pump 14 into one or another cavity of the hydraulic cylinder 15 (reverse mechanism for changing the working length of the transverse steering rod 16), thereby changing its length and providing the required toe-in of the wheels 1.

Thus, the proposed device for continuous automatic control of the convergence of the steered wheels of the car in motion increases the sensitivity and accuracy, ensures the correct position of the steered wheels under various driving conditions (acceleration, coasting, 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, containing steered wheels mounted through bearings mounted on bushings with collars on the axles, strain gauges mounted on the end surfaces of the collars of the bushes, which are sensors of the side reaction of the road and connected via a bridge circuit to a source power supply and through an electric signal amplifier with an electromagnetic coil, the core of which is connected to the spool of the flow switchgear p working fluid in communication with the working fluid reservoir, 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 flanges of the bushings on the outer ends from the inside are tapered and the outer end surfaces of the inner ends of these flanges are separated from the flanges of the inner race of the inner bearings wheel hub radial annular groove.

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