Vehicle hydro pneumatic shock absorber

FIELD: machine building.

SUBSTANCE: invention relates to automotive machine building, particularly, to automotive cushioning systems. The proposed shock absorber comprises hydraulic cylinder filled with working fluid and accommodating piston and rod, and hydraulic accumulator. The rod lower part is furnished with radial throttling orifices and spring-loaded control plunger with edge covering aforesaid orifices. The said radial throttling orifices are spaced along the rod length so that the said control plunger jumps the orifices in turn, thus gradually varying the total flow section. The control plunger is fitted in the piston, outside the working fluid flows, and can deviate from its normal position only under gravity.

EFFECT: higher comfort and controllability of vehicle in running over irregular road coat.

3 dwg

 

The invention relates to a transport machine-building, namely the suspension systems of vehicles.

Known pneumatic spring suspension of a vehicle, containing a cylinder that has a piston rod forming in the cylinder and piston and an annular cavity, and a hydraulic accumulator connected to the cylinder chamber through the valve. The said valve is made in the form of a damping node, self-regulated, depending on the amplitude and direction of vibration. In the body of the valve has a plunger U-shaped section with the possibility of axial movement within the valve, and the plunger has its discharge microclean.

At small amplitudes of oscillation of the rod relative to the cylinder damping force is minimal, since the U-shaped plunger oscillates up and down inside the valve together with the working fluid. But at high amplitudes resistance damping increases as the plunger locks in their extreme positions part of throttling holes for the passage of liquid remains only a thin hole microclean (RF patent No. 2209735 from 25.04.2002, IPC B60G 11/26).

The disadvantage of the described construction is that the valve with the plunger are not on stock, and in the lower part of the cylinder, and attempts to increase the resistance during the end will cause the mn is significant of razrjazhenie above the valve, that will lead to boiling and cavitation of the liquid and subsequent malfunction of the device.

This disadvantage is partially removed in known pneumatic spring bellows (RF patent No. 2045832 from 29.06.94, IPC B60G 11/26)containing the cylinder with the rod and the piston, a hydraulic accumulator connected to the cylinder chamber through the valve and damper maximum fluctuations. In this construction the valve is built into the stock, which is both a hydraulic accumulator. The valve contains a spring-loaded plunger that its lower edge may close or open throttling radial holes drilled in the valve body. The plunger responds to pressure differentials in newportnews and podpornoy cavities, and in large variations of the working fluid, overcoming the resistance of the spring lifts the plunger, and his bottom hem opens radial throttling holes, giving reduced damping forces.

A disadvantage of the known construction is that the device that modifies the degree of damping of the shock absorber, not able to separate what is happening during the course of the retreat: move if the wheels down, overcoming the emptiness, to restore contact with the road or moving the vehicle body at this moment up.

In actual practice the ICA movement of the vehicle over rough terrain, there are two qualitatively different kinds of moves end. Spring suspension, rasimas after passing irregularities (bumps, bump), at the same time tends to push the vehicle body up and wheels down. While it is desirable that the wheels as soon as possible regained contact with the road and therefore the resistance during the retreat should be minimal. But as soon as the wheel has regained contact with the road, further radiatia spring causes pobros the vehicle body up, and, in order to alleviate this negative effect, the shock absorber should be at this point, the maximum resistance of the end. In other words, on the same course wound spring (stroke end) must have different resistance end - minimal if the wheels came off from the road surface and they need to quickly regain the contact; and a maximum in the case, if the contact has been restored (or was lost), and the spring still needs to be decompressed. Known as the design is not able to divide described two cases of stroke rebound and reduces mutual oscillations of the piston and cylinder of the shock absorber in the same manner: low-amplitude with great resistance, and chirocentridae - with less resistance. While there are situations when a large amplitude and speed of movement of the piston rod with the piston relative to the cylinder of the shock absorber must have a low resistance to the move from the HH.

The present invention is to improve the comfort and controllability of the vehicle when driving on uneven floor. The absorber determines the beginning of the vertical oscillations of the vehicle body and at that moment increases its resistance. In the case of oscillations of the wheels relative to the housing shock resistance is minimal, even if these movements have a significant amplitude. This task is solved in that the absorber containing a cylinder filled with a working fluid, with a piston and rod having at its lower part radial throttling holes, and a spring-loaded plunger, overlapping the edge of these throttling holes mentioned throttling holes are not located in the same transverse plane as that of the prototype, and spaced along the height of the stem. At the same time the spring loaded regulating plunger attached to the piston rod on a sliding fit, and the side clearance between it and the piston is large enough for the free flowing of the working fluid. Thanks to this device the shock absorber in the normal state has a low level of damping, as for the passage of fluid from newportnews cavity in podporchennuyu opened the largest number of throttling holes on the bottom of the stem. And only if the vertical is tion of movement of the body together with the rod up (padros) regulating the plunger due to its weight tends to maintain its position and, overcoming the resistance of its spring, overlaps part of the throttling holes, which increases the resistance to the stroke end and slows down pobros body up. That is, the absorber intensively absorbs only the vibrations of the body, but fluctuations wheels extinguishes with a slight resistance so that they as quickly as possible restored contact with the road surface.

The applicant is unknown use in science and technology of the distinctive characteristics of the shock absorber with the achievement of the technical result.

1 shows a longitudinal section of the proposed absorber is at rest, and figure 2 shows the same cut, but at the moment the goal of the vehicle body up. Figure 3 represents one variant of embodiment, when the hydraulic cylinder is connected to the vehicle body, and a rod - with wheels, i.e. the shock absorber is upside-down compared to 1 and 2.

The proposed absorber contains (1) cylinder 1 and accumulator 2, interconnected Flex 3. In the case of the hydraulic cylinder has a piston 4 with the rod 5, forming nadporshnevaya cavity and podporchennuyu cavity B. the Piston 4 of the cylinder 1 is made hollow and is attached to the rod 5 by a nut 6. Inside of the piston 4 on the shaft 5 worn on a sliding landing regulating plunger 7, resting the bottom on the spring 8. The lower part of the stem 5 has a longitudinal channel 9 with two holes 10 extending in nadporshnevaya cavity A. the same channel 9 in the lower part of the stem 5 has a number of fine throttling holes 11 located on a spiral generatrix. The lower edge of the regulating plunger 7 as it descends down covers an increasing number of throttling holes 11, which increases the resistance during the call.

The upper part of the piston has a series of vertical holes 12, is covered with a plate valve 13 stroke compression ratio, which creates a slight resistance. Spring bottom 8 is locked by the bolt 14 is screwed into the end of the rod 5.

The hydraulic accumulator housing 2 contains a compensation piston 15, which divides the hydraulic and pneumatic cavity In the cavity, For injection of compressed gas into the cavity G is the fitting 16. In the lower part of the cylinder 2 has a needle regulator 17 of the resistance of the compression stroke and check valve 18.

Option, depicted in figure 1, involves the connection rod 5 to the vehicle body, and the cylinder 1 with wheels (not shown).

The proposed absorber is as follows. During the compression cylinder 1 goes up toward the stem 5. Volume podpornoy cavity B decreases, and the liquid part, overcoming the slight resistance of the valve the compression 13, flows in nadporshnevaya cavity A. the Other part of the fluid flows through the pipe 3 into the accumulator 2, overcoming the resistance of the needle regulator 17. In other words, the resistance of the compression stroke is created in the main controller 17, and the resistance to compression valve 13 is negligible. That is the work of the proposed absorber during compression stroke does not differ from the known shock absorbers.

During the course of the rebound damper independently adjusts the resistance depending on the vertical oscillations of the body. The best work of the suspension of the vehicle is considered to be such in which there is no vertical acceleration of the body, i.e. it is stationary relative to the horizon line. Wheels should after overcoming obstacles (bumps) as quickly as possible to restore contact with the surface. Thus, if the hydraulic cylinder 1 moves down together with the wheel, in this case, the regulating piston 7 remains in its upper position and its lower edge opens up the greatest number of throttling holes 11. The liquid is expelled from newportnews cavity And podporchennuyu cavity B through the longitudinal channel 9, then through the maximum number of open throttling holes 11. This mode stroke end shown in figure 1, the resistance of the stroke end is minimal.

If twisting during the stroke end of the vehicle body throws up, in this case, the regulating plunger 7 in order to maintain the state of rest relative to the Earth's gravitational field, compresses the spring 8 and its lower edge overlaps the part throttle openings 11 and thereby increases the resistance to the stroke end and prevents the spring or springs of the vehicle too hard to push the body up. This situation is depicted in figure 2. In other words, the proposed absorber can vary the resistance stroke rebound from a minimum when the wheels need to move down to restore contact with the surface, to the maximum when the contact of the wheels restored and further radiatia springs or leaf springs cause unwanted pobros the vehicle body up.

It should be noted that in the proposed absorber resistance stroke rebound varies not by the velocity of flowing fluids from newportnews cavity And podporchennuyu B, and reacts exactly on the vertical swinging of the body. Thus, the proposed design allows faster known to restore the contact of the wheels with the road, for example, with the passage of irregular rotation, and on the other hand, in the first moment of the goal of the vehicle body up sharply increases the resistance and prevents it from swinging, what is Ino increase the comfort and safety of movement.

The invention can be implemented in other versions: for example, if the vehicle body is connected to the hydraulic cylinder 1 and the rod 5 with the wheels (figure 3). In this case, the regulating plunger 7 with its spring 8 is mounted in a separate Cup 19, which is rigidly connected to the cylinder 1. The shock absorber piston 4 is hollow, and the cavity a and B is provided with a separate hose 20 and compression hose end 21. Flex 3 connects the cavity under the regulating plunger 7 with hydraulic cavity In the accumulator 2. In the lower part of the hydraulic accumulator 2 are mounted check valve 18, the filling valve 22 and the needle regulator 17 of the resistance of the compression stroke.

The absorber is presented on figure 3, operates as follows. Since the piston 4 is deaf, at the point in the stroke of compression all the oil from the cavity And flows through the hose compression 20 through the needle regulator 17 in the hydraulic cavity In the accumulator 2. At the same time from the cavity through the check valve 18 is fed podpornega cavity B of the cylinder 1. During the same stroke end oil should be replaced from podpornoy cavity B, but since the valve 18 in this thread oil locked, the oil remains one path through the throttling holes 11 and Flex 3. In this case, if the hydraulic cylinder 1, which is connected with the body transportnogo the funds not given up, the regulating piston 7 is pressed by its spring 8 in its extreme upper position and the number of open throttling holes as possible. Accordingly, the resistance during the low end. But if at the moment of hitting the wheels of the vehicle to the obstacle is his pobros up, the regulating plunger 7 moves down relative to the cylinder 1 and overlaps with its lower edge portion of the throttling holes 11, which increases the resistance during the rebound and reduces the swaying of the vehicle.

There may be other options for technical execution, but the distinguishing feature of the present invention remains constant: resistance during rebound adjustable spring-loaded plunger that its edge may overlap the throttling holes. In this constructive element, which is placed regulating plunger must be rigidly connected to the vehicle body, and the plunger moves along the throttling holes do not flow of the working fluid and under the action of gravitational forces.

A hydropneumatic shock absorber of a vehicle, containing a cylinder filled with working fluid, with a piston and rod having at its lower part radial throttling holes and a spring-loaded regulating plunger, PE is Kryvyi the edge of these holes, as well as a hydraulic accumulator, characterized in that, to improve comfort and safety, mentioned radial throttling holes spaced along the length of the rod so that the regulating plunger can cover them one at a time, smoothly changing the total flow section; at the same time control plunger is located in the piston flows out of the fluid and may deviate from its normal position under the action of gravity.



 

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