RU2405704C1 - 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 face surfaces of rotary cams and sleeve and ring fastening washers have two diametrically located thrusts that represent triangular prisms. Rings that accommodate strain gages thrust against prism edges.

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 is known for automatically controlling the convergence of steered wheels during movement, containing road side reaction sensors acting on steered wheels, which are piezoelectric sensors in the form of washers mounted on the axles of 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 to 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 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 according to the bridge circuit, mounted on the end surfaces of the rings, mounted on the axes of the rotary trunnions, on which bearings are mounted on the bushings steering wheels, and an electric signal amplifier, a reversing mechanism for changing the working length of the transverse steering rod and the system board the specified mechanism, electrically connected to the sensors of the side reaction of the road (RF patent No. 2348913, 03/10/2009, Bull. No. 7).

The disadvantages of this device are the lack of sensitivity and accuracy without amplification of the electric signal from the sensors of the side reactions of the road, and with the amplifier - the complexity of the design, reduced reliability and 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 the sensitivity and accuracy, simplify the design, reduce the cost and operating costs, increase reliability.

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 vehicle 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 side reactions of the road, power supply, electromagnetic coil, switchgear, reservoir with working fluid, pump, transverse thrust with reversing mechanism ism, the inner end surfaces of the steering knuckles and washers and rings on the axles have two diametrically arranged stops in the form of triangular prisms, the edges of which abut the rings and through which lateral road reactions are transmitted to the load cells mounted on the end surfaces of these rings , which increases the design sensitivity, accuracy and eliminates the electric signal amplifier.

The figure 1 shows a General diagram of the proposed device; in figure 2 - the axis of the steered wheel assembly (in the top view of the bearings, the nut of the sleeve with the washer are not shown).

The proposed device includes steered wheels 1 mounted through bearings on the bushings 2, rings 3, washers 4 of the fastening of the bushings and rings on the axles 5 with the steering knuckles 6. The inner end surfaces of the knuckles 6 and the washers 4 of the mounting of the bushings and rings on the axles have two diametrically located stops 7 in the form of triangular prisms, in the ribs of which the rings abut against the outer ends. Strain gauges (electric sensors of the side reactions of the road) 8 are mounted on the end surfaces of the rings 3, have the same electrical resistance and are connected by a bridge circuit 9. Points A and B of the electric bridge 9 are connected to a power source 10, and points C and D to an electromagnetic coil 11 , the core of which is rigidly connected with the spool 12 of the switchgear 13 of the flow of the working fluid. The device also contains a tank 14, a pump 15 and a reverse mechanism for changing the working length of the transverse steering rod (hydraulic cylinder) 16. Strain gauges 8, an electric bridge 9, a power supply 10, an electromagnetic coil 11 and a switchgear 13 form a control system for a reversing mechanism 16 for changing the working length of the transverse tie rod 17.

The clearance in the bearings (inner race 18, rollers 19, outer race not shown) of the steered wheels is regulated by a nut 20 with a washer 21. The sleeve 2 is fixed to the axle 5 of the steered wheels by a nut 22 with a washer 4.

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 9 to the electromagnetic coil 11 is zero and the spool 12 of the switchgear 13 is in the central (neutral) position.

If the convergence to the positive or negative sides is rejected, the steered wheels 1 due to the lateral road reactions resulting from the bushings 2, rings 3 and stops 7 on the inner end surfaces of the knuckles 6 and washers 4 of the bushings and rings fastening on the axles of the wheels will act on the load cells 8 and change their electrical resistance. In this case, a voltage is applied between points C and D of the bridge 9, which is supplied to the electromagnetic coil 11. The current in the coil 11 will cause a magnetic flux moving the core of the coil 11 and the spool 12 of the switchgear 13 left or right, providing a supply of working fluid from the pump 15 to either another cavity of the hydraulic cylinder (reversing mechanism) 16 changing the working length of the transverse steering rod 17, 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 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 control of the convergence of the steered wheels of a vehicle in motion, comprising steered wheels mounted through bearings on bushes, rings and washers with nuts for fastening bushes and rings on axles with rotary cams, load cells, which are sensors of the side reaction of the road, mounted on the end surfaces of the rings and connected via a bridge circuit with a power source and with an electromagnetic coil, the core of which is connected to the spool of the flow switchgear p barrels of 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 transverse steering link, characterized in that the inner end surfaces of the steering knuckles and washers of the bushings and rings on the axles have two diametrically arranged stops in the form of triangular prisms, in the ribs of which the outer ends abut the rings on which the strain gauges are fixed.