Pneumatic suspension

FIELD: transportation.

SUBSTANCE: pneumatic suspension comprises rubber-cord casing with cover forming work space, additional capacity located between them and baffle with valve unit. Valve unit includes cylinder installed along suspension axis, radial bypass holes, piston and rod fitted in cover. Valve unit is made in the form of damping unit self-regulating by amplitude and direction of vibrations. In valve unit body the cylinder with piston is installed forming circular cavity together with body. Circular cavity is connected with additional capacity space and with rubber-cord casing space via radial bypass holes closed by flexible elements attached to outer surface of body. Circular cavity is also connected with cylinder space via radial channels made in the centre part of cylinder at distance equal to piston height. Piston is connected with rod made as resilient core and forms together with cylinder the over-piston space communicating with rubber-cord casing space and under-piston space communicating with additional capacity space.

EFFECT: improvement of vehicle soft riding over roads of any types, operation reliability improvement, reduction of energy losses and suspension heating.

2 dwg

 

The invention relates to a cushioning vehicles, in particular for pneumatic suspensions with an air damper, a self-regulating amplitude and direction of vibration.

Known pneumatic elastic suspension elements of a vehicle containing filled with a compressed gas rubber shell, a cylinder, a fixed piston rod connected to one of the grounds rubber-shell, at the bottom through which the ball joint is fixed to the cylinder, and the bottom and the lid of the last executed calibrated channels and openings which are closed by diaphragms designed for air intake in nadporshnevaya and podporchennuyu cavity of the cylinder respectively with passages compression and impact. Free air intake in nadporshnevaya and podporchennuyu cavity of the cylinder increases the pressure drop in them respectively with the passages compression and impact and total energy losses during operation of the suspension (as the USSR №1010147, F16F 9/04, 60G 11/26, 1983).

The disadvantage of this pneumatic elastic suspension elements of the vehicle design is the complexity that reduces its reliability. In addition, the constant throttling of air through a calibrated channels in the cylinder on the compression and rebound causes rapid heating of the elastic element increases its rigidity and sobstvennosti fluctuations, which leads to the reduction extinguishing properties to the above-resonance modes, where for increased vibration protection properties of the suspension stiffness and damping force must be reduced.

The closest known technical solution is air suspension containing rubber shell with lid, forming a working cavity, additional capacity and located between the partition with a valve device which includes mounted on the axis of the suspension and fixed to the wall of the cylinder, radially spaced by-pass hole, mounted in the lid and placed in the cylinder the piston rod movably mounted on the piston blocking the bypass hole on the course of the retreat. Valve device equalizes the pressure in the working and additional cavities suspension in the beginning of the compression stroke, resulting in a constant natural frequencies and reducing bias depreciable object down (A.S. USSR №842295, F16F 9/04, 1981).

This air suspension has a relatively low technical level, due to the need for axial movement of the cover and the additional capacity that is almost impossible to provide in the suspensions of modern vehicles. Furthermore, the design of the damping node in resso the e has a limited resource due to the presence of a pair of friction of the piston on the rod, and implemented by spring air damping is not effective because it is, first, only in the course of the retreat, and, secondly, because of the presence of the phase shift of the absolute and relative oscillation damping force of the suspension on the part of its stroke may coincide with the direction of movement of the sprung mass, then the force must always be directed against this movement.

In this regard, the most important task is the creation of a new design of air suspension air damper, with greater reliability and forming a new damping system of automatic regulation of their characteristics depending on the amplitude and direction of the vibrations through the valve device, providing separation of working and additional cavities when you change the direction of deformation of the suspension and the alignment of the pressure in these cavities on the moves of the compression and rebound at the moment of passing the suspension of its static position.

The technical result of the claimed suspension is automatic self-regulation of their characteristics on the amplitude and direction of vibration, which leads to an improvement in the smoothness of the vehicle on all types of roads, increase reliability, reduce energy losses and heating of the suspension.

Specified technical is the second result is achieved by in pneumatic suspension containing rubber shell with lid, forming a working cavity, the additional capacity that is located between the partition with a valve device, comprising mounted on the axis of the suspension cylinder, radial bypass hole, the piston and fixed to the stem cap, valve device made in the form of a damping node, self-regulating amplitude and direction of vibration, which body has a cylinder with a piston forming with the casing an annular cavity that is connected with the cavity of additional capacity and with the cavity of the rubber-shell pass through radial holes, closed elastic elements mounted on the outer surface of the housing, and connected with the cylinder chamber through the radial channels made in the middle part of the cylinder at a distance equal to the height of the piston, which is connected with the rod, made in the form of an elastic rod, and forms with the cylinder nadporshnevaya cavity communicated with the cavity of the rubber-shell, and podporchennuyu cavity communicated with the cavity of additional capacity.

Due to the fact that the valve device made in the form of a damping node, self-regulating amplitude and direction of vibration, which body has a cylinder with a piston forming with the casing ring is first cavity, connected to the cavity of additional capacity and with the cavity of the rubber-shell pass through radial holes, closed elastic elements mounted on the outer surface of the casing, and connected with the cylinder chamber through the radial channels made in the middle part of the cylinder at a distance equal to the height of the piston, which is connected with the rod and forms with the cylinder nadporshnevaya cavity communicated with the cavity of the rubber-shell, and podporchennuyu cavity communicated with the cavity of additional capacity is provided by the division of labor and the additional cavities when you change the direction of deformation of the suspension and the alignment of the pressure in these cavities on the moves of the compression and rebound at the time of passage of the suspension of his a static position. The result of this algorithm to adjust characteristics of the suspension depending on the amplitude and direction of the oscillation damping force is almost always directed against the motion of the sprung mass, which provides effective damping of vibrations and reducing energy losses and heating of the suspension.

Following the implementation of the stem in the form of an elastic rod is suspension with possible distortions and displacement of the cover relative to the additional capacity that simplifies the design of the suspension and increases its reliability.

Figure 1 shows the proposed air suspension, a longitudinal section; figure 2 - is it working chart.

Air suspension contains rubber shell 1 with a cover 2, an additional capacity of 3 and located between the partition 4. Rubber-cord shell 1, cover 2 and the partition wall 4 to form a working cavity 5, which periodically communicates with the internal cavity 6 additional tank 3 via a valve device made in the form of a damping node, self-regulating amplitude and direction of vibration. Case 7 damping node rigidly mounted on the partition wall 4. In the housing 7 has a cylinder 8, which forms with the housing 7 of the annular cavity 9 that is connected with the inner cavity 6 and the working cavity 5 pass through radial holes 10 and 11, is made in the lower and upper housing parts 7 and closed elastic elements 12 and 13, mounted on the outer surface of the shell 7. In the cylinder 8 has a piston 14, is made of fluoroplastic - 4 and connected with the cover 2 by means of an elastic rod 15. The annular cavity 9 is connected with the cylinder chamber 8 through the radial channels 16 and 17, made in the middle part of the cylinder 8 at a distance equal to the height of the piston 14, which forms with the cylinder 8 nadporshnevaya cavity 18 provided with the working cavity 5, and podporchennuyu cavity 19, with sennou with an internal cavity 6.

On the partition wall 4 is fixed rubber buffer stroke compression ratio 20, under which additional capacity 3 set the rib in the form of a cylinder 21 with radial holes.

We offer air suspension works as follows.

In the static position of the piston 14 connected to the cover 2 by the elastic rod 15, is located in the middle part of the cylinder 8 between its radial channels 16 and 17, which corresponds to point 1 elastic characteristics at the working diagram of the suspension (figure 2).

During compression of the suspension, the additional capacity is 3 moves upward, the cover 2 with the piston 14 downward, and the lower part of the rubber-shell 1 is rolled over the outer surface of the additional capacity 3, the wall 4 is installed on the housing 7 of the damping of the site. The pressure in the working cavity 5 is increased, resulting in the elastic element 13 is pressed against the outer surface of the housing 7 and closes the bypass hole 11, and the air from the working cavity 5 almost without resistance flows into the inner cavity 6 through nadporshnevaya cavity 18, the radial channels 16, the annular cavity 9 and the bypass holes 10, pressing from the outer wall of the casing 7 of the elastic element 12. The result is almost simultaneous increase of pressure in the working 5 and 6 internal cavities, which provides teaching is TKE I soft elastic response (figure 2).

In the subsequent course of stretching the additional capacity 3 moves downwards, and the cover 2 with the piston 14 upward. The pressure in the working cavity 5 is reduced, resulting in the elastic element 12 is pressed to the outer wall of the housing 7 and closes the bypass hole 10, rasamma cavity 6 and 5. The result is a sharp drop in pressure in the working cavity 5, which provides in section II hard elastic response (figure 2).

In the middle position of the piston 14 opens radial channels 17 and the air from the internal cavity 6 almost without resistance flows into the working cavity 5 through podporchennuyu cavity 19, the radial channels 17, the annular cavity 9 and the bypass holes 11, pressing the elastic element 13 from the outer surface of the housing 7. The result is almost instantaneous pressure equalization in the work 5 and 6 internal cavities (point 1 in figure 2).

Upon further stretching suspension air from the internal cavity 6 almost freely into the working cavity 5 through podporchennuyu cavity 19, the radial channels 17, the annular cavity 9 and the bypass holes 11, pressing from the outer wall of the casing 7 of the elastic element 13. The result is almost simultaneous lowering of the pressure in the working 5 and 6 internal cavities, which provides in section III soft elastic characteristics is istica (figure 2).

In the subsequent course of compression, the additional capacity is 3 moves upward, and the cover 2 with the piston 14 downward. The pressure in the working cavity 5 is increased, resulting in the elastic element 13 is pressed to the outer wall of the housing 7 and closes the bypass hole 11, rasamma cavity 6 and 5. The result is a sharp increase in pressure in the working cavity 5, which provides in section IV hard elastic response (figure 2).

In the middle position of the piston 14 opens radial channels 16 and the air from the working cavity 5 almost without resistance flows into the inner cavity 6 through nadporshnevaya cavity 18, the radial channels 16, the annular cavity 9 and the bypass holes 10, the elastic pressing element 12 from the outer surface of the housing 7. The result is almost instantaneous pressure equalization in the work 5 and 6 internal cavities (point 1 in figure 2).

At the end of the compression rubber buffer 20, interacting with the cover 2, deformed, which prevents a hard impact. The main burden falls on the rib 21, which prevents deflection of the septum 4.

We offer pneumatic suspension provides self-regulation of their characteristics on the amplitude and direction of vibration, which leads to an improvement in the smoothness of the vehicle for any types Doro is, to increase reliability, reduce energy losses and heating of the suspension.

Air suspension containing rubber shell with lid, forming a working cavity, the additional capacity that is located between the partition with a valve device, comprising mounted on the axis of the suspension cylinder, radial bypass hole, the piston and fixed to the stem cap, characterized in that the valve device is designed as a damping node, self-regulating amplitude and direction of vibration, which body has a cylinder with a piston forming with the casing an annular cavity that is connected with the cavity of additional capacity and with the cavity of the rubber-shell pass through radial holes, closed elastic elements mounted on the outer surface of the housing, and connected with the cylinder chamber through the radial channels made in the middle part of the cylinder at a distance equal to the height of the piston, which is connected with the rod, made in the form of an elastic rod, and forms with the cylinder nadporshnevaya cavity communicated with the cavity of the rubber-shell, and podporchennuyu cavity communicated with the cavity of additional capacity.



 

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2 dwg

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