DD222670A1 - DEVICE FOR HYDROSTATIC STORAGE OF CYLINDRICAL KOERPERS - Google Patents

Abstract

Device for the hydrostatic storage of cylindrical bodies. The aim of the invention is a hochpraezis working hydrostatic radial bearing. The task is to avoid a change in the bearing geometry by the prevailing lubricant internal pressure. The solution consists in that the effective surfaces of arranged on the outer wall of the bearing ring concentric with the bearing gap between the bearing ring and stored part, outwardly by an outer ring completed, interconnected and via chokes with the pressure pockets in hydraulic functional relationship standing annular gaps to the from Bearing gap enclosed Lagerflaeche be in such a relationship that the force acting through the lubricant pressure behind the chokes from the inside to the outside of the bearing ring to the force acting through the higher lubricant feed pressure in the annular gaps in front of the chokes from the outside inwards on the bearing ring forces in the Balance stand. The application is possible with all types of radial bearings, especially with hydrostatic piston rod bearings in hydraulic cylinders. figure

Description

Inventor: Leipzig, December 15, 1983

Herbert Houda, Andreas Sucker,.

Oochen bird; all Leipzig

Authorized representative:

Pat.-Ing, Ralf Seybold

in VEB Werkstoffprüfmaschinen Leipzig.

Operation of the VEB Werkzeugmaschinenkombinat. "Fritz Heckert"

DOR-7030 Leipzig, Alfred-Kästner-Str. 69

Hydrostatic bearing device for cylindrical bodies Field of application of the invention

The field of application of the invention extends to hydrostatic radial bearings. Hydrostatic piston rod bearings in hydraulic cylinders come into consideration as a special field of application.

Characteristic of the known technical solutions

From DE-Auslegeschrift 17 65 114 and other sources hydrostatic radial bearings are known in which provided to supply the bearing with lubricant more over the circumference of the bore wall uniformly distributed pressure pockets and these are connected via throttles with a pressure fluid source. A disadvantage of these solutions is the possibility of the occurrence of unfavorable stiffness ratios and thus a deterioration of the function, especially in precision hydraulic cylinders.

Object of the invention

The aim of the invention is a high-precision hydrostatic radial bearing. ,

 , ..:. , - 2 -. , Explanation of the essence of the invention

The disadvantages described in the characteristic of the known technical solutions can be attributed to the following causes:

Be the solutions mentioned above are subjected to pressure, both the D _r ucktaschen and the bearing gap between the bore wall of the bearing ring and the bearing portion by supplying lubricant. In this case, the mounted part usually has a full cross-section, so that only negligible deformations occur at the usual in practice lubricant pressures on this part. On the bearing ring, on the other hand, due to the internal pressure generated during feeding, even with a thick-walled design, relatively large elastic bearings are created. With this, the bearing geometry changes and, as a result, the bearing properties also change. , '·

To eliminate these causes, the invention has the object, a device for hydrostatic bearing cylindrical body, in particular radial bearing, wherein a plurality of pressure pockets are evenly distributed over the circumference of the bore wall of the bearing ring and lüssigkeitsqu, elle are connected via throttles with a Druckt to provide, in which an elastic expansion of the bearing ring is avoided by the resulting in the "supply of lubricant 'internal pressure,

This object is achieved in that on the outer wall of the bearing ring concentric with the gerringes between the bore wall of the L _a and the bearing part bearing gap formed one or more annular gaps are arranged - the lower connected - via throttles with the pressure pockets and thus the L ^ gerspalt are in hydraulic function and connection to the outside by a drawn onto the L _a Gerring, close to 'its end strings compared to the same sealed with suitable means the outer ring are completed. In the annular gaps, the lubrication

material feed pressure for the chokes, The effective surfaces of the annular gaps are in such a relationship to the bearing gap enclosed bearing surface, that the forces acting by the Sc.hmierstoffdruck behind the chokes from the inside to the outside on the bearing ring to the forces through the lubricant feed pressure are in the annular gaps in front of the reactors from the outside inwards acting on the L _a Gerring forces imported balance,

Embodiment ·

The accompanying drawing shows a schematic section through dine inventive radial bearing, Shown is only one bearing point. ·.

The piston rod 1 of a hydraulic cylinder, not shown, is arranged centrally and axially movable in a bearing ring 2. Axially limited in the bore wall of the L _a gerringes 2SXnQ ₁ and evenly distributed over the circumference, several pressure pockets 3 in the usual form (only two shown) incorporated. Near the two end faces of the bearing ring 2 is ever a leak oil collection channel 4 pierced in the bore wall. The bounded by the leak oil collection channels 4 space between the surface of the piston rod 1 and the not provided with pressure pockets 3 surface of the bore wall is referred to as L _a gerspalt 5. Three concentric with the L ₃ gerspalt 5 in the outer wall of the bearing ring 2 incorporated annular grooves form with the 'inner wall of a mounted on the bearing ring 2 outer ring S a system of channels (not shown) associated annular gaps 7, near its two end faces of the outer ring S is opposite the L _a gerring 2 sealed by suitable means 8. A guided through the wall of the outer ring Druckflüssigkeitszulaitung 9 serves to feed the annular gaps 7, From the outer wall of the bearing ring 2 to each pressure pocket 3 inwardly leading openings connect as throttles 10 the Ringspal.te 7 with the pressure pockets 3,

i 4-.

The function is as follows.

Through the pressure fluid supply line 9 lubricant is fed into the radial bearing. This builds up in the system of annular gaps, 7 vor.den chokes 10 of the lubricant feed pressure. Make the flow through the throttles 10, the fluid pressure in the pressure pockets 3 is lower than before the throttles and is referred to as * lubricant pressure. With this pressure, the lubricant spreads, starting from the pressure pockets 3, in the bearing gap 5, then enters the leak oil collection channels 4, where it is sucked off by suitable devices and returned to the hydraulic fluid circuit. If the axial, length of the annular gap 7 was selected correctly, then the forces acting through the lubricant pressure in the bearing gap 5 from the inside to the outside on the bearing ring 2 are due to the lubricant feed pressure in the system of the annular gaps 7 from outside to inside the bearing ring 2 acting forces in equilibrium.

The solution according to the invention offers over the known prior art the advantage of a highly precise working hydrostatic bearing since, as a result of the equilibrium of the acting forces, an elastic widening of the bearing ring by the prevailing lubricant pressure is avoided and the bearing geometry is maintained.

Claims (1)

- 5 - ^{: /}
Erfindungsansprueh Device for the hydrostatic bearing of cylindrical bodies, in particular radial bearing, in which a plurality of pressure pockets are uniformly distributed over the circumference, the bore wall of the bearing ring 'and are connected via throttles to a pressure fluid source, characterized in that that on the outer wall of the L _a gerringes (2) concentric with the between the bore wall, the bearing ring (2) and the surface of the mounted part (l) resulting Lage'rspalt (5) one or more annular gaps (7) are arranged, the - connected to each other - via throttles (10) with the pressure pockets (3) and thus the bearing gap (5) in a hydraulic functional context and are outwardly by a. on the L _a gerring (2) mounted, sealed in the vicinity of its end faces against the same sealed outer ring (6), wherein the effective surfaces of the annular gaps (7) in such a relationship to the storage gap (5) enclosed bearing surface are that the forces acting on the bearing ring (2) by the lubricant pressure behind the throttles (10) from the inside outwards to those due to the higher, lubricant feed pressure in the annular gaps (7) in front of the throttles (10) from outside to inside on the bearing ring (2) acting forces are in equilibrium « For this 1 sheet drawing -