RU2398701C1 - Device to automatically control controlled wheels toe-in in motion - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to automotive industry and can be used to automatically control controlled wheels toe-in in motion. Proposed device comprises controlled wheels, hubs with outer and inner flanges, strain gages, axles, electric power supply, electric signal amplifier, electromagnetic coil, hydraulic control valve, vessel with work fluid, pump and cross link with reversing mechanism. Strain gages transudes of the road lateral reaction and are connected in bridge circuit with electric power supply and, via electric signal amplifier, with electromagnetic coil. Electromagnetic oil core is rigidly connected with spool-valve of work fluid flow control valve communicated with work fluid vessel, pump and hydraulic cylinder of reversing mechanism to vary work length of crosswise link. Rotary cam has three axial blunt holes. Three L-like levers are arranged on the ends of sleeves to support strain gages secured on face surface. Stepped ends of L-like levers of the sleeve inner ends have their narrow part entering said axial blunt holes made in rotary cam. Depth of blunt holes is larger than length of narrow part of the ends of said levers.

EFFECT: higher reliability, fast response and accuracy of automatic toe-in adjustment.

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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, 10.11.2005, 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 leniya the specified 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, complexity and insufficient reliability of the design, the cost of electric energy for the operation of the amplifier.

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 reliability, sensitivity and accuracy, simplifying the design, reducing the cost and operating costs.

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, strain gauges connected to an electric bridge, which are sensors of the side reaction of the road, axles, power supply, electromagnetic coil, distribution device, tank with working fluid, pump, transverse thrust with a reversing mechanism, the knuckle has three axial blind holes and bushings the ends have three L-shaped levers through which lateral reactions of the road are transmitted, while the ends of the L-shaped levers of the inner ends of the bushings are stepped, the narrow part of which enters axial blind holes in the knuckle, and the depth of these holes is greater than the length of the narrow parts of the ends of the levers, which helps to prevent turning of the bushings relative to the axles of the wheels, increase the sensitivity of the structure, accuracy and eliminate the amplifier.

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

The proposed device includes steered wheels 1 mounted through bearings, mounted on bushings 2 with L-shaped levers 3 on axles with pivoting fists 4, having three axial blind holes on the inner end surfaces 5. Strain gauges (electric sensors of the side reaction of the road) 6 are fixed on the end surfaces of the L-shaped levers of the 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 source 8, and points C and D - with an electromagnetic coil 9, the core of which is rigidly connected to the spool 10 of the switchgear 11 of the working fluid flow. The device also contains a tank 12, a pump 13 and a reverse mechanism for changing the working length of the transverse steering rod (hydraulic cylinder) 14. Strain gauges 6, an electric bridge 7, a power supply 8, an electromagnetic coil 9 and a switchgear 11 form a control system for a reversing mechanism 14 for changing the working length of the transverse tie rod 15.

The clearance in the bearings (inner race 16, rollers 17, outer race not shown) of the steered wheels is regulated by a nut 18 with a washer. The sleeve 2 is fixed on the axis 5 of the steered wheels with a nut 19 and a washer 20.

The ends of the L-shaped levers 3 of the inner ends of the bushings are stepped, a narrow part of them enters the axial blind holes 5 in the knuckle 4, and the depth of these holes is greater than the length of the narrow part of the ends of the levers.

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.

When the convergence to the positive or negative side is deviated, the steered wheels 1 due to lateral reactions of the road through the bushings 2 with L-shaped levers 3 will act on the load cells 6 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. The current in the coil 9 will cause a magnetic flux moving the core of the coil 9 and the spool 10 of the switchgear 11 left or right, providing a supply of working fluid from the pump 13 to either another cavity of the hydraulic cylinder 14 (reverse mechanism for changing the working length of the transverse steering rod 15), thereby changing its length and providing the required toe-in of the wheels 1. Narrow parts of the ends of the L-shaped levers 3 of the inner ends of the bushings, entering s in axial blind hole 5 in the knuckle 4 will preclude rotation bushing 2 relative to the wheel axles.

Thus, the proposed device for continuous automatic regulation of the convergence of the steered wheels of the car in motion increases the sensitivity and accuracy, simplifies the design, increases reliability, reduces the cost and operating costs of the device, ensures the correct position of the steered wheels in various driving modes (acceleration, reel, 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 a car in motion, comprising steered wheels mounted through bearings, mounted on bushings on axles with rotary fists, strain gauges, which are sensors of the side reaction of the road and connected via a bridge circuit to a power source and with an electromagnetic coil, core which is connected to the spool of the switchgear of the flow of the working fluid in communication with the capacity for the working fluid, the pump and the hydraulic cylinder m of a reverse mechanism for changing the working length of the steering tie rod, characterized in that the knuckle has three axial blind holes and the bushings at the ends have three L-shaped levers, the load cells are fixed to their end surfaces, while the ends of the L-shaped levers of the inner ends of the bushings - stepped, the narrow part of which is included in axial blind holes in the knuckle, and the depth of these holes is greater than the length of the narrow part of the ends of the levers.

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