Hydraulic shock-absorber

FIELD: transport.

SUBSTANCE: invention relates to hydraulic shock-absorbing struts, particularly, to the strut adjustment devices, primarily to such devices that allow stabilising the automotive suspension shock struts at ambient temperature varying from +40°C to -40°C irrespective of the used oil type. The hydraulic shock-absorber incorporates a hydraulic cylinder with drain ports communicating the piston and rod spaces, a rod, a drain port spring and drain port plate with one or several holes for oil to pass through. A part of one or several holes is constantly above the drain port or piston holes. The drain port twisted spring one end is rigidly attached to the plate, its second end being coupled with the rod. The said plate can rotate driven by the spring when the length of the latter varies at temperature variation. The said spring can be cylindrical connected to the plate via a sleeve rigidly linked with the plate and spring. Invention can be used, for example, in the VAZ-type car front suspension shock strut.

EFFECT: hydraulic shock strut featuring constant performances at whatever ambient temperature irrespective of the used oil type.

2 cl, 2 dwg

 

The invention relates to a hydraulic shock absorber racks suspension of vehicles, in particular to devices for their regulation, mainly to the device, makes it possible to stabilize the characteristics of the hydraulic shock absorber racks car suspension fluctuations in ambient temperature between +40°-40°C.

Known vehicle suspension containing a guiding device, main and additional elastic elements in the form of coil springs, one of which is a compression spring, and a hydraulic cylinder, in which the main elastic element is located between the axis of the wheel and the supporting member of the body of the vehicle, and between the support element body and a jumper associated with the specified cylinder, which other end is connected with the axle of the wheel, with additional elastic element is a spring tension, the hydraulic cylinder is connected with the axle of the wheel to its shaft, and with the upper end of the additional elastic element of his case, in the hydraulic cylinder rod and Rodless cylinders cavity made with fittings for pumping fluid from one cavity to another, when this jumper is rigidly fixed on the body of the hydraulic cylinder (awts of the USSR №1678650, CL 60G 17/00, publ. 23.09.91,, bull. No. 35).

A disadvantage of the known suspension is the dependence of the characteristics of the suspension from the ambient temperature and the viscosity of the liquid, which is especially noticeable at low temperatures.

Also known regulatory system suspension characteristics of the vehicle containing the installed between the frame and axle of an elastic element and a hydraulic cylinder connected to the system hydroelasticity through the level Adjuster housing, the accelerometer mounted near the wheel, which is connected through a double integrator and amplifier with the specified controller, the pressure sensor in the cavity of the cylinder and the sensor deflection of the elastic element, which is connected to the amplifier through the blocks forming, with the elastic element and the cylinder is made in the form of a cylinder without the back pressure provided by the gas spring is placed in the piston cavity, and the piston chamber with a gas spring and an annular rod cavity is hermetically separated one from another, the system includes a compensation unit, the inputs of which is connected with pressure sensors in the cavities of the specified cylinder, and the output connected to the amplifier via the processing unit, when this ring rod cavity connected to the system hydroelasticity through a level controller, which is connected to the sensors, linear displacement and acceleration of the rod of the pneumatic-hydraulic C is lindra, specifies the block and through the compensation unit with pressure sensors in the cavity of a pneumatic cylinder and piston chamber with a gas spring connected to the system hydroelasticity through a level controller, which is connected only with the linear position sensor rod pneumatic cylinder and master block (ed. St. USSR № 1773743, CL 60 G 25/00, publ. 07.11.92,, bull. No. 41).

A disadvantage of the known regulatory system is its complexity and dependence characteristics of the suspension, external temperature conditions, especially at low temperatures.

Closest to the claimed invention is a telescopic hydraulic shock absorber strut front suspension of a motor vehicle comprising a cylinder, a piston with bypass holes, a rod, a plate bypass valve and spring by-pass valve, made in the form of a bent at an obtuse angle one diametrical axis tailchase plate (Kosarev, S., Volgin S.N., Kozlov P.L., Ametov VA "VAZ-2110, VAZ-21102, VAZ-21103, VAZ-2111, VAZ-2112, Manual, operation and maintenance. Spare parts catalog. Publishing house "Wheel", Moscow, 2001, p.88).

A disadvantage of the known telescopic hydraulic shock absorber rack is the reduction characteristics of the shock absorber at low temperature the arts due to the increase in viscosity of the working fluid (oil), as well as the instability characteristics with the use of different grades of oil due to the fact that the dependence of viscosity on temperature (the curve of the graph) is different for different types of oils (especially this difference significantly at temperatures below zero degrees).

The objective of the invention is to improve the shock-absorbing qualities of the hydraulic shock absorber of a suspension in a wide range of operating temperatures using different types of oils.

The problem is solved, we offer hydraulic shock absorber, containing cylinder, a piston with bypass holes connecting the piston and the rod end, rod, plate bypass valve and spring by-pass valve, when this plate by-pass valve is provided with one or more holes for the passage of oil, the part of one or more holes permanently partially located above the bypass hole or holes in the piston and spring by-pass valve are twisted and rigidly connected at one end with a plate, and a second end with the rod, and the plate is made to rotate. The spring may be made cylindrical. The spring may be connected with the plate through the bushing rigidly connected with the plate and spring.

The invention is illustrated by drawings, where nafig there is shown a hydraulic shock absorber in section, figure 2 is a top view of the piston plate.

Hydraulic shock absorber (1,2) includes a cylinder 1 in which is placed a rod 3 with the piston 2. The piston is made of the overflow drain 4 and 16 closed by a plate 5. Piston 13 and rod 14 of the cavity is filled with oil. The plate 5 by-pass valve made one or more openings 8 for the passage of oil. Since the viscosity of various grades of oil when the temperature change is reflected different curves, and the shape and area of the openings 8 will be different for different grades of oil used. Thus, for each type of oil used should be made its own plate 5 with the same hole 8, which area would be consistent with the dependence of the efforts of the absorber temperature of this grade of oil in the temperature range from 40°C to +80°C. Holes 8 are constantly partially located above the bypass holes 4 (figure 2). The plate 5 is made to rotate under the action of the spring 6. Spring 6 is made of twisted and cylindrical, and one end of the spring is rigidly connected with the rod for site 11 and the second end of the spring is rigidly connected or plate 5 directly, or through the sleeve 12, which in turn are rigidly connected to the plate 5. In case of use of the sleeve 12, the flow of oil from the cavity into the cavity through calcev the th gap 10 between the sleeve and the rod. To extend the length of the spring it can be made cylindrical with a diameter equal to the diameter of the stem.

Hydraulic shock absorber works as follows. At a temperature of +20°plate 5 is in such a position that the flow of oil between the cavities occurs through the holes 4 and 8. During the compression plate 5 moves away from the surface 7 of the piston 2, and the holes 4 and 16 fully open. At lower oil temperatures down to -20°and the lower the viscosity of the oil in the cylinder is increased due to which the flow of oil from the piston cavity in the rod at a loss, and depreciation properties are reduced. At this point, under the action of freezing temperatures is a reduction of the length of the spring 6 (thermal compression), and rigidly associated plate 5 when this turns, increasing the throughput cross section of the holes 4 and 8, and the flow of oil from one cavity to another, thereby absorbing properties remain stable. The lower the ambient temperature, the greater will be opened holes 4 and 8. When the temperature is raised to the positive spring 6 is extended and moves the plate 5 in the other direction (thermal expansion), reducing the throughput cross section of the holes 4 and 8. Thus, the spring 6 performs two functions: it presses the plate 5 to the surface 7 of the piston 2 and is simultaneously stand the mechanism working as company plates. For different grades of oil you can make pistons with holes 4 in the plate 5 that their area will correspond to the dependence of the efforts of the absorber temperature.

The proposed absorber of simple construction and provides improved shock absorbing qualities in a wide range of operating temperatures and when using any sort of oil. The shock absorber of the proposed design can be installed on vehicles as manufacturing plants and business service centers.

Thus, the present invention allows to create hydraulic shock absorber rack, for example, the front suspension of the car VAZ, which would have a higher damping properties at any temperature and any type of oil used, which is especially important in winter.

1. Hydraulic shock absorber, containing cylinder, a piston with bypass holes connecting the piston and the rod end, the rod spring bypass valve and Poppet relief valve with one or more holes for the passage of oil, the part of one or more holes permanently partially located above the bypass hole or holes in the piston and spring by-pass valve are twisted and rigidly connected at one end with a plate, and a second end with the rod, while the plate is made to rotate under the action of the spring by changing the length of the spring under the action of temperature.

2. The hydraulic shock absorber according to claim 1, characterized in that the spring is cylindrical and is connected to the plate through the bushing rigidly connected with the plate and spring.



 

Same patents:

FIELD: transport engineering.

SUBSTANCE: invention relates to hydraulic shock absorber struts of vehicle suspensions, particularly, to devices providing their adjustment, stabilizing of characteristics of suspension shock absorber struts at ambient temperature fluctuations within +40°C and -40°C. Proposed hydraulic shock absorber contains hydraulic cylinder with working medium, piston and rod. Piston and rod spaces are connected by channels made in piston and additional channel made in rod. Capacity of additional channel is made adjustable depending on temperature of working medium by means of rotary bushing with hole and spring made of bimetal or material with memorized shape effect and rigidly connected by one end with rod and by other end with adjusting bushing.

EFFECT: provision of hydraulic strut of front suspension of VAZ car with constant characteristics at any temperature of ambient air which is important in winter.

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FIELD: transport engineering; amphibians.

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FIELD: mechanics.

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FIELD: engineering industry.

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FIELD: engineering industry.

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2 cl, 2 dwg

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FIELD: mechanical engineering.

SUBSTANCE: hydraulic damper comprises cylinder that receives interconnected flexible rod and piston. The piston is provided with the passages curved at the right angle and radial ribs. The flexible rod is hollow, and the piston is mounted on the flexible rod for permitting movement and is spring-loaded with respect to it by a compression spring. The joining pin is rigidly connected with the face of the piston. The end of the pin is provided with splains that cooperate with the answered splains made in the inner generatrix of the surface of the flexible rod.

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EFFECT: increased reliability of hydraulic generator operation.

2 cl, 2 dwg

FIELD: transport.

SUBSTANCE: motor vehicle suspension air-hydraulic shock-absorber incorporates a cylinder housing a piston with a rod to form a piston and annular spaces. The shock-absorber contains also a hydraulic accumulator arranged in a bottle accommodating a separating diaphragm to form an air space and hydraulic space communicating with the cylinder piston space via a valve mounted in the said bottle. The aforesaid valve represents a damping element, self-adjustable depending upon pressure difference and furnished with the main throttling channel that continuously communicates the cylinder piston space with the hydraulic accumulator hydraulic space. The check valve communicates occasionally the cylinder piston space with the hydraulic accumulator hydraulic space. A spring-loaded stepwise plunger is arranged in the damping assembly casing central bore to form with it several plunger spaces. This invention allows effecting a stepwise N-like variation of the damping characteristic rigidity subject to the shock-absorber compression rated due to higher drag in the compression low and high rate zone and drag stepwise decrease at medium compression rates.

EFFECT: smooth run of the motor vehicle on whatever roads and higher reliability of the shock-absorber.

3 dwg

FIELD: mechanics.

SUBSTANCE: pneumatic suspension comprises a rubber-cord casing with a cover, which form main working cavity, additional cavity located inside the main working cavity and co-axial thereto, and a baffle between them. On the baffle, a cylinder-type valve unit is rigidly secured. The cylinder bottom is attached to the baffle and has axial openings. In the cylinder wall, there are axial channels, which connect the working cavity with the cylinder cavity. In the cylinder end cover, there are axial openings, elastic valves, which contact the axial openings in the cylinder bottom and its end cover at the beginning of compression or retraction, respectively. In the cylinder end cover and bottom, solenoid windings are installed. Inside the cylinder cavity, isolation valve of piston type is installed. Both ends of the piston are provided with guiding magnet plungers with retracting springs installed inside the solenoid windings connected to the valve control system. The valve control system comprises a displacement transducer, a speed signal conditioner, a differential steering unit, switch control units, power circuit limit switches for connecting solenoid windings to the power supply. The displacement transducer is connected to the speed signal conditioner, which is connected to the differential steering unit, outputs of which are connected to inputs of power-circuit limit switch control units. Outputs of the units are connected to control inputs of power-circuit limit switches.

EFFECT: enhanced damping properties of pneumatic suspension.

2 cl, 3 dwg

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