Hydraulic damper with controlled parameters

FIELD: transport.

SUBSTANCE: proposed damper comprises body, cylinder, rod with piston and extra piston to divide said cylinder to three chambers. Different-stiffness spring is fitted in every said chamber. Said chambers are communicated by pipelines via controlled throttles and solenoid valves. Pipeline is connected with feed main and discharge line. Throttles and valves are controlled by control unit in response to signals fed by the driver.

EFFECT: wider adjustment band, simplified design.

3 cl, 2 dwg

 

The invention relates to transport machinery, namely, hydraulic shock absorbers with adjustable stiffness and damping to reduce transmission of vibrations to the vehicle.

A known design of a hydraulic shock absorber with adjustable characteristics (RF patent 2316685, F16F 9/342). The absorber consists of a reservoir, the working cylinder, the piston of the throttle holes, hollow rod with flange rod by-pass valve disc by-pass valve, plates, disks, and the valve spring compression and impact, adjusting nut, cuffs rod, spring seals, cartridge seals, leading and driven gears, thrust roller bearings, electric motor, control unit, speed sensors and oscillations of the suspension and the amplifier of the sensor signals. The main disadvantage of this invention can be attributed to the complexity and bulkiness of the design of the absorber, in real operating conditions can lead to numerous failures and failure of the shock absorber. Also the drawbacks include the inability to adjust the stiffness of the shock absorber in a fairly wide range.

It is also known device (patent RF 2402703, F16F 9/16, F16F 5/00), containing a working cylinder, a piston with throttle openings, the return valve and the valve of the compression rod, dump valves return and LF is ment, the compensation chamber within which a piston separating the working fluid and the inert gas. The design of the present invention partially eliminates the disadvantages inherent in the analogue. Performance has become more simple, which increases reliability. The disadvantage of this shock absorber is the inability to adjust the compression force of a fairly wide range, as well as the impossibility of manual settings using the external switch.

The technical task of the invention is to improve the reliability of the shock absorber by simplifying its structure, as well as ensuring its device adjusting the stiffness and damping capacity of the shock absorber by the user without leaving the cabin, depending on driving style or road surface.

The technical result of the claimed absorber is to remove the complex mechanisms of the working cylinder and replacing them easier. Also it is possible to control the damping capacity and the stiffness of the shock absorber by changing the bore chokes electrical signal and changing the pre-compression spring acting regulating the fluid pressure, which is set based on road conditions. It is also possible discrete on and off springs, depending the on the set mode of the shock absorber. This set allows you to adjust the performance characteristics of the shock absorber in a very wide range.

1 shows a General view of the hydraulic shock absorber with adjustable characteristics. The absorber consists of a body 1, of the working cylinder 2, a piston 3 connected to the piston 4, the springs 6, 7 and 8 of different hardness (F6>F8>F7), the separating piston 5, the rod end 9, Rodless cylinders cavity 10 and the additional cavity 11, the adjustable inductors 12, 13 and 14, connected with the cavities 9, 10 and 11 through piping, solenoid valves 15, 16 and 17 are also connected to the cavities 9, 10 and 11 carrying out the connection cavities with a nutrient pipeline, the electromagnetic valve 18 installed in the drain pipe, the reservoir with the working fluid 19, the filter 20, the feed pump 21, the bypass valve 22. The inductors 12, 13, 14 and solenoid valves 15, 16, 17 and 18 receive signals from the control unit 23 (figure 2), which in turn operates in the mode prescribed driving device 24.

The proposed device operates as follows. Depending on the road surface and driving style, the user places the appropriate switch setting device 24 (figure 2). Then the signals go into the control unit 23. After processing these signals, it gives electr the economic signals in adjustable chokes 12, 13 and 14 (figure 1), as well as solenoid valves 15, 16, 17 and 18 in accordance with the specified mode of operation, setting characteristics from "hard" stroke of the shock absorber to "soft".

The static mode of the shock absorber. Inside the cavities 9, 10 and 11 is the working fluid of equal pressure in each of the cavities. Solenoid valves 15, 16, 17 and 18 are closed by the control unit. Adjustable inductors 12, 13 and 14 are open. The pump 21 pumps through the filter 20, the working fluid from the reservoir 19. Since the valves 15, 16 and 17 are closed, the working fluid drains back into the tank through the bypass valve 22.

Mode "hard" stroke shock absorber is achieved by discrete off spring 7 and the closure of the cavity 10. For this purpose, the pump 21 through the filter 20 supplies the working fluid from the reservoir 19 into the cavity 10 through the open solenoid valve 16 (adjustable inductor 13 is closed, and an adjustable throttle 14 and the electromagnetic valve 18 is opened), thereby creating a high pressure in the cavity 10, which via the separating piston 5 compresses the spring 8, thereby increasing its rigidity. Then the valves 16 and 18 are closed, thereby the liquid in the cavity 10 is "locked" and the spring 7 is disconnected from work. The liquid starts to flow through the bypass valve. In adjustable chokes 12 and 14 by the control unit 23 is set to a minimum the th value of the orifice. The shock absorber begins to work in "hard" mode, when running springs 6 and 8, and the liquid flows through the choke by pipeline from the cavity 11 in the cavity 9 in the compression stroke, and from the cavity 9 in the cavity 11 in the course of the retreat. Before installing another mode if necessary, the control unit 23 opens the throttle 13 and the valve 18 for relieving excess pressure. The fluid discharged into the reservoir 19. The separating piston is returned to its original position. The valve 18 is closed.

To obtain optimal operation mode of the shock absorber control unit closes the throttle 14, thereby disconnects from the spring 8 and the cavity 11. The control unit sets the average value of the bandwidth chokes 12 and 13. The shock absorber begins to work in "optimal" mode, when running springs 6 and 7, and the liquid flows through the choke by pipeline from the cavity 10 in the cavity 9 in the compression stroke, and from the cavity 9 in the cavity 10 in the course of the retreat. If necessary, the control unit supplies the same signals to the actuators for pressure relief.

The mode of operation of the shock absorber, soft swing, corresponds to the static state of shock. In this mode, the fluid in the compression stroke flows out of the cavities 10 and 11 in the cavity 9, and from the cavity 9 flows into the cavity 10 and 11 in the course of the retreat.

Intermediate values of stiffness and Denver the tion, located between "hard", "optimum" and "mild" stroke shock absorber set by changing pre-compression springs 7 and 8 to various values, and the change of the orifice of adjustable inductors 12, 13 and 14. In sovokupnosti these controls are used to set operating characteristics of the shock absorber in a very wide range.

1. Hydraulic shock absorber with adjustable characteristics, comprising a housing, a cylinder, the piston and the additional piston, which together divide the cylinder into three cavities, each of which is mounted a spring with a different stiffness, cavities are connected by pipelines through the adjustable choke valves and solenoid valves, pipe is connected with the supply line, and a drain, chokes and valves are controlled by the control unit, which in turn receives a signal from the setting device.

2. The shock absorber according to claim 1, characterized by the possibility of discrete on and off springs from work.

3. The shock absorber according to claim 1, characterized in that it is possible not only in regulating generouse ability of the shock absorber by changing the bandwidth chokes, but the change in the stiffness of the shock absorber due to the preliminary compression of the spring by pumping fluid into one of palaste is depending on the set mode.



 

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FIELD: machine building.

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FIELD: mechanical engineering.

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EFFECT: expanded functional capabilities.

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EFFECT: enlarged manufacturing possibilities, improved efficiency of shock absorber.

1 dwg

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SUBSTANCE: shock absorbing apparatus includes housing, rod, piston, secured to rod end and cylinder arranged between housing and piston. There are flow-through valves in cylinder; said valves are in the form of two openings mutually communicated by means of trough. Piston may move along the whole height of cylinder for operation of several flow-through valves. Change of summed diameters of said openings provides variable rigidity factor of shock-absorbing apparatus.

EFFECT: possibility for setting rigidity factor of shock absorbing apparatus depending upon technological demands.

2 cl, 2 dwg

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