RU2432291C1 - 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, sleeves, strain gages, axles with rotary cams, sleeves, rings and washers with nuts to fasten the former on the axle, power supply, electromagnetic coil, distributing device, vessel with working fluid, pump and transverse tie rod with reversing mechanism. Strain gages are secured on face surfaces of the rings and interconnected in bridge circuit to make road lateral response transducers. Rings outer end faces have axial trapezoidal ledges. Lateral surfaces of washers fastening bushes and rings on wheel axles are axial bores that receive ring ledges. Radial ledges are made on washer inner diametres, axial grooves are made on wheel axles ends to receive radial ledges of washers. Bush ends have axial cutouts while all rings have their inner faces provided with axial ledges that enter bush cutouts. ^ EFFECT: higher reliability, sensitivity and accuracy of control in motion. ^ 2 dwg

Description

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

A device for automatically controlling the convergence of the steered wheels in the process of driving, containing 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 via 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 to 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 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 disadvantages of this device is the lack of reliability, since during operation it is possible to rotate the bushings and rings with strain gauges relative to the axles of the wheels, which will lead to a failure of the device.

The technical result of the proposed device for continuous automatic regulation of the convergence of the steered wheels of the car during movement is to increase reliability.

The specified technical result is achieved by the fact that in a device for automatically controlling the convergence of steered wheels of a car during movement, containing steered wheels with bearings, axles with slewing fists, bushings, rings and washers with nuts for their fastening on the axles, strain gauges connected to an electric bridge, which are sensors of side reactions of the road, power source, electromagnetic coil, electric signal amplifier, switchgear, reservoir with working fluid, pump, cross The end traction with a reversing mechanism, the outer rings on the outer (with respect to the sleeve) ends have axial trapezoidal protrusions, and the inner surfaces of the mounting washers of the bushes and rings on the axles of the wheels have axial trapezoidal openings that include the protrusions of the rings;

in addition, these washers in the holes have radial protrusions, and at the ends of the axles of the wheels there are radial grooves into which these protrusions of the washers enter; the sleeves at the ends have axial trapezoidal cuts, and all rings on the side of the sleeves have axial trapezoidal protrusions included in the cutouts of the sleeves, which prevents turning of the sleeves and rings with strain gauges, increasing the reliability of the design.

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 mounted through bearings mounted on bushings 2, rings 3 with strain gauges fixed on end surfaces (electric sensors of side reactions of the road) 4 on axles 5. At the ends of axles 5 of the wheels there are axial grooves 6. Strain gauges 4 have the same electrical resistances 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 are connected to the electromagnetic coil 9, the core of which is rigidly connected to the gold 10 com dispensing apparatus 11 of working fluid. The device also contains a container 12, a pump 13 and a reverse mechanism for changing the working length of the transverse steering rod (hydraulic cylinder) 14. Strain gauges 4, 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 transverse working length tie rod 15.

The outer rings 3 at the outer (with respect to the sleeve) ends have axial trapezoidal protrusions 16, and the inner surfaces of the washers of the bushings and rings on the axles of the wheels have axial trapezoidal holes 17, which include the protrusions of the rings. The washers in the holes have radial protrusions 18. The bushings at the ends have axial trapezoidal cutouts 19, and all the rings on the side of the bushings have axial protrusions 20 included in the cutouts of the bushings. The clearance in the bearings (inner race 21, rollers 22, outer race not shown) of the steered wheels is regulated by a nut 23 with a washer 24. The sleeve 2 is fixed to the axle 5 of the steered wheels by a nut 25 with a washer 26.

The device also includes an electric signal amplifier 27.

The device operates as follows.

With the rectilinear movement of the car and the correct convergence of the steered wheels, the side reactions of the road to these wheels are absent, and the load cell resistances are equal to each other, therefore the voltage supplied from points C and D of the electric bridge 7 through the electric signal amplifier 27 to the electromagnetic coil 9 is zero and the spool 10 of the switchgear 11 is in a central (neutral) position.

If 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 and rings 3 will act on the load cells 4 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 27 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 pump 13 into one or another cavity of the hydraulic cylinder (reversing mechanism) 14 of changing 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 automatically controlling the convergence of the steered wheels of the car during movement 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 automatically controlling the convergence of steered wheels of a vehicle during movement, comprising steered wheels mounted through bearings mounted on bushings, on axles with rotary fists, bushings, rings and washers with nuts for their fastening on the axles, strain gauges mounted on the end surfaces of the rings, connected by a bridge circuit and which are sensors of the side reactions of the road, an electric power source, an electric signal amplifier, an electromagnetic coil, the core of which is rigidly connected to gold com of the distributor of the working fluid flow, a container with the working fluid, a pump and a reversing mechanism for changing the working length of the transverse steering link, characterized in that the outer rings have axial trapezoidal protrusions on the outer ends with respect to the sleeve, and the inner surfaces of the bushings and rings on the axles of the wheels - axial trapezoidal holes in which the protrusions of the rings enter, in addition, these washers in the holes have radial protrusions, and at the ends of the axles of the wheels there are radial grooves in which these projections of the washers enter, the bushings at the ends have axial trapezoidal cuts, and all rings on the side of the bushings have axial trapezoidal protrusions included in the cutouts of the bushings, which prevents turning of the bushings and rings with strain gauges, increasing the reliability of the structure.

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