SU144095A1 - Hydraulic spring - Google Patents

Description

Hydraulic springs of known construction, operating on the principle of fluid compression, using devices for automatic leakage compensation, do not provide a nonlinear characteristic and do not allow refueling of the spring without removing it from the machine.

The spring, made in accordance with this proposal, is free from these drawbacks due to the fact that it uses a combination of a limiting valve with overlap at the appropriate point of the stroke of the rod of the holes connecting different volumes of fluid.

To ensure that the suction cavity of the cylinder is refilled with liquid from the backup chamber, both when the spring is horizontal and inclined, the backup chamber has an annular shape on the machine and is directly mounted on the inner cylinder.

FIG. 1 shows the spring of the proposed design; in fig. 2 - curve of pressure change in the cylinder depending on the position of the rod.

The spring consists of eyelet 1, stem 2, protective corrugation 3, polyamide cuff 4, back-up annular chamber 5 with a stopper-breather, valve 6, suction chamber 7, polyamide sleeve-throttle 5 pressed into the stem head, valve 9, guide cylinder 40 with a radial bore 11, a limiting valve 12 with a calibrated bore 13, and a housing 14.

The principle of the spring operation is as follows.

Under the action of the load on the rod 2, the latter begins to enter the inside of the body 14, compressing the special fluid inside the body and the cylinder 10. The liquid is compressed in both cavities according to the compressibility graph. In this case, valve 9 is closed and fluid is sucked in through chamber 6 from chamber 5 by discharge in chamber 7. In the further course (/ g), after blocking the bore 11404-2-1 with the 11 head of the rod 2 (point A), inside the cylinder / O, the pressure P will increase dramatically (curve /), due to the cut-off of a part of the fluid volume, to the value of / B and C), limited valve spring tightening 12.

Leaking at this moment into the chamber 7 along the gap between the sleeve 8 and the cylinder // a part of the liquid will increase the pressure in this cavity, and the valve 6 will close. During the return stroke of the rod due to the potential energy of the compressed fluid, the pressure in the cylinder 40 initially drops sharply (curve //), the valve 9 opens and the fluid from chamber 7 flows into the cylinder 10. After the holes 11 are opened, the pressure in all cavities is equalized, and the return the stroke is made along a curve from point A to point O,

Depending on the chosen diameter of the rod, the size of the outer diameter of the spring case for a given distance between the centers of the lugs also varies.

The proposed spring design facilitates the operation of the final stem seal, increases reliability and provides non-linear cycle characteristics to improve the smoothness of the progress of self-propelled machines. Tests have established that the process of fluid compression is close to adiabatic and practically the spring does not heat up much.

Subject invention

Claims (2)

1. Hydraulic spring, working on the principle of compressibility of a fluid, using devices for automatic liquid leakage compensation, characterized in that, in order to ensure its work on non-linear characteristic-cycle, it uses a combination of a limit valve with overlap at the corresponding stroke point stem holes, informing the different largest volumes of fluid. 2. The spring of claim 1, wherein and in order to ensure that the suction cavity of the cylinder is refilled with liquid from the backup chamber, both when the spring is horizontal and when the machine is inclined, the backup chamber has an annular shape and directly mounted on the inner cylinder. z j i