RU2381477C1 - Device to automatically adjust toe-in in motion - Google Patents

Abstract

FIELD: automotive industry.

SUBSTANCE: proposed device comprises road lateral reaction pickups, reversing gear to vary work length of transverse track rod, control system for above mechanism, control valve spool long-stroke coaxial attachment, control tie rod and dog. Road lateral reaction pickups represent outer and inner flexible tight round cylinders. The latter are mounted on controlled wheels axles, are tightly intercommunicated and communicated with control cylinder appropriate chamber. Control valve spool comprises bell crank fitted on fixed axle. Short arm of said bell crank is jointed with control cylinder piston rod, while its long arm is pivoted to control tie rod, in its turn, pivoted with control valve spool.

EFFECT: higher accuracy and reliability.

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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 of a vehicle in motion, comprising lateral force sensors acting on steered wheels, relays whose movable contacts are associated with respective lateral force sensors, a reversible mechanism for changing the working length of the transverse steering link and a control system for said mechanism with fixed relay contacts (AS USSR No. 905692, 02.15.1982, Bull. No. 6).

The disadvantage of this device is the low reliability caused by the presence of relays with movable and fixed contacts, which can be triggered by vibrations of the steered wheels.

Closest to the proposed device is a device for automatically controlling the convergence of the steered wheels during movement, comprising a reversible mechanism for changing the working length of the transverse steering link and a control system for the said mechanism, associated with sensors of the side reaction of the road acting on steered wheels, which use external and internal elastic sealed elements in the form of round cylinders mounted on the axles of the steered wheels and hermetically paired between on itself and with the corresponding cavity of the control cylinder (RF Patent No. 2309078, 10.27.2007, Bull. No. 30).

The device works well with a significant deviation of the convergence of the steered wheels, but its disadvantage is low sensitivity, accuracy and reliability, because with a small deviation of the steering wheel toe, which is predominant in the process of movement, and, therefore, a small displacement of the piston of the control cylinder, the spool stroke is insufficient to connect the corresponding cavity of the hydraulic cylinder to the pump and practically does not eliminate the deviation in the toe, which leads to the preservation of increased tire wear and fuel consumption .

The technical result of the proposed device for automatically controlling the convergence of the steered wheels of the car during movement is to increase the sensitivity, accuracy and reliability even with a small displacement of the piston of the control cylinder.

The specified technical result is achieved by the fact that a device for automatically controlling the convergence of steered wheels of a car during movement, comprising external and internal elastic sealed elements in the form of round cylinders mounted on the axles of steered wheels, which are sensors of side reactions of the road acting on steered wheels that are hermetically sealed in pairs interconnected and with the corresponding cavity of the control cylinder, the reversing mechanism (hydraulic cylinder) changes the working length transversely th steering rod and a control system for the specified mechanism, including a control cylinder, a switchgear and a hydraulic pump connected to the sensors of the side reaction of the road, is equipped with a coaxial extension of the stroke of the spool of the switchgear (the control cylinder and the switchgear are coaxial), including a two-arm mounted on a fixed axis , adjusting rod and leash, rigidly fixed to the spool, and the short shoulder of the two shoulders of the lever connected to the piston rod of the control ilindra and long hingedly connected to an adjusting rod, which is in turn pivotally connected to the slide valve of the distributor.

A device for automatically controlling the convergence of the steered wheels of the car during movement is shown in the drawing, which shows a general diagram of the proposed device.

The proposed device includes steered wheels 1 mounted through bearings and bushings 2 on axles 3, on which elastic tight external 4 and internal 5 road side reaction sensors are also installed. Axis 3 through the side levers are connected by a transverse steering link 6 of variable length. External 4 and internal 5 sensors of the side reaction of the road are made in the form of round cylinders having the same volumes, are under the same pressure of the working medium and are connected by pipelines 7 and 8 to each other and to the corresponding cavities of the control cylinder 9. The piston rod of the control cylinder through the two-arm lever 10, the adjusting rod 11 and the leash 12 are rigidly connected to the spool 13 of the distributor 14 of the working fluid flow. The device also contains a tank 15, a pump 16 and a reversing mechanism for changing the working length of the transverse steering rod (hydraulic cylinder) 17.

The lateral reaction sensors of the road 4 and 5, pipelines 7 and 8, a control cylinder 9, a travel accelerator and a distributor 14 of the working fluid flow form a control system for the reversible mechanism for changing the working length of the transverse steering link 17.

The device operates as follows.

With the rectilinear movement of the vehicle and the correct convergence of the steered wheels, there are no lateral reactions of the road to these wheels, and the working fluid pressure in the side reaction sensors of the roads 4 and 5 are equal to each other, so the piston of the control cylinder 9 is in the middle position and the spool 13 of the switchgear 14 is in the central (neutral) position, providing a given length of the tie rod 6.

If the convergence to the positive or negative sides deviates, the steered wheels 1 due to side reactions of the road through bearings and bushings 2 will act on the internal 5 or 4 outer sensors of the side reaction of the road and change the pressure in the control system of the reversing mechanism to change the working length of the transverse steering link 17. When In this case, the increased pressure in the pipelines 7 or 8 will shift the piston of the control cylinder 9 to the corresponding side, and with it through the two-arm lever 10, the adjusting rod 11 and Odok 12 moves the spool 13 of the switchgear 14 left or right. This will ensure the supply of working fluid from the pump 16 to the corresponding cavity of the hydraulic cylinder 17 of the reversing mechanism for changing the working length of the transverse steering rod 6, providing the required toe-in.

Thus, the proposed device for automatically controlling the convergence of the steered wheels of the car during movement allows you to ensure the correct toe of the steered wheels in various driving modes (acceleration, coasting, braking) even with a small movement of the piston of the control cylinder, which increases sensitivity, accuracy and reliability and helps to reduce resistance to movement, tire wear and fuel consumption.

Claims (1)

A device for automatically controlling the convergence of the steered wheels of a vehicle during movement, containing the lateral road reaction sensors acting on the steered wheels, in the form of external and internal elastic tight round cylinders mounted on the axles of the steered wheels and hermetically connected to each other and to the corresponding cavity of the control cylinder, a reversing mechanism for changing the working length of the transverse steering link and a control system for the specified mechanism associated with the sensors of the side reaction of the roads characterized in that it is equipped with a coaxial extension of the stroke of the spool of the switchgear, including a two-arm lever mounted on a fixed axis, an adjusting rod and a lead rigidly mounted on the spool, the short arm of the two-arm lever connected to the piston rod of the control cylinder, and the long pivotally connected to adjusting rod, which, in turn, is pivotally connected to the spool of the switchgear.