DE1912735U - GAS-LUBRICATED SLIDING BEARING. - Google Patents

Description

Gas-stripped ^ plain bearings

The innovation relates to a gasgesohmlertes plain bearings with at least two substantially radial bores having bearing bush and a joint Druekraum which communicates via throttle channels with the holes in connection are already plain bearings of the aforementioned type are known in which the throttle channels have a certain predetermined cross-section and Let a certain amount of gas flow into the bearing gap per unit of time. If the pressure acting on the bearing is increased on one side in a certain direction, the shaft running in it is eccentrically deflected from its normal position and touches in a certain direction

Gesellschaft für Linde's Eismaschinen Aktiengesellschaft

Load the bearing shell.

Furthermore, (German patent specification Kr, 866 419) Became known bearings in which check valves are arranged in front of the throttle channels. These check valves should the lubricant feeds with a certain bearing load shut off * so that you go to the one specified by the oil pump The maximum possible static pressure in the bearing gap is still a dynamic one caused by the pumping action of the shaft Can build up additional pressure. Since the viscosity of gases is very low compared to that of liquids, it arises also through a dynamic contact part in gas-smeared ones There was a very small increase in load-bearing capacity.

The task of the innovation is to create a gas lubricant fee Plain bearing with an increased readiness to support under load. According to the innovation, this is achieved by that »the opening cross-section of at least a partial number of the throttle channels can be adjusted by an associated valve each is.

According to a special embodiment of the innovation, a control device acting on each valve is provided, which the opening cross-section depending on the respective size of the adjacent hole in question Bearing gap adjusted.

Further details and advantages of the innovation are described in connection with the drawing. It shows

Gesellschaft für Linde's Eismaschinen Aktiengesellschat

Flg. 1 an embodiment of a gas-lubricated Slide bearing according to the innovation in longitudinal section,

FIG. 2 shows a section along the line II-II of FIG. 1 in a broken view.

The embodiment shown in FIG. 1 of a cohesive plain bearing essentially consists of a bearing bush 1, which has at least two essentially radial bores 2. The bores 2 are designed as valve seats 3 on the outer surface © of the bearing bush 1 and each interact with a poppet valve 5 which is under the influence of a compression spring 4. The shaft 6 of this poppet valve 5 has a larger cross-section than the valve disk and is guided in a respective associated radial bore of a sleeve 8 which surrounds the bearing bush 1 in a gas-tight manner. The inner surface of the sleeve 8 and the outer surface of the bearing bush 1 together form an annular common pressure space 9. The outer surface © of the sleeve 8 is under atmospheric pressure. The identification of the compression springs 4 is adjustable by stop screws 10, polygons are guided in a Qewind © in the outer part of the radial bores 7. The adjusting screws 10 have an air bore 11 connected to the surface of the valve stem β. The adjusting screws 10 are secured by counter screws 12. The valve plates of the valves 5 have incisions I ^, which throttle channels between the common pressure chamber 9 and

Gesellschaft für Linde's Eismaschinen Aktiengesellschaft

- Ij. -

the radial bores 2 ″. At the same time, the incisions 13 determine the minimum amount of gas flowing into the bores 2. The bearing bush 1 receives a shaft 14 which - shown somewhat exaggerated - floats eccentrically to the bore of the bearing bush 1 in the gas flow Wave lh can be caused, for example, by normal gravity or by other load conditions. On the circumference of the sleeve 8 there is also a supply duct 15 through which the gas intended for lubrication can get into the pressure chamber 9. The gastight fit of the sleeve 8 to the d © r bearing bush 1 is achieved by a sealing ring l6 and a © flange seal 17 «

With a centrally mounted shaft 3.4 flows out of the common Pressure chamber 9 by acting as throttle channels

Incision V $ as well as the radial bores 2 a constant gas flow into the bearing gap 18. The valves 5 are closed here. The springs 4 are dimensioned in such a way that, together with the suction force that pulls the valves towards the center of the shaft, they flow into the incisions 13 Gas outweigh the outward gas pressure in the space 9. If the W He in the bearing bush is now deflected eccentrically, the effective bearing gap 18 and the one flowing through at this point are reduced at this point

oil volume per unit of time. In the same way it decreases 25th

also the flow rate of the gas flow in the incisions 15 of FIG

Gesellschaft für Linde's Eismaschinen Aktiengeseilschatt

Valves which are adjacent to this reduced bearing gap. This results in a reduction in the valve disk on the valve seat 3 sucking force in such a way that now the gas pressure prevailing in the common pressure chamber 9 predominates and the valve 3 against the force of the spring 4 and the external atmospheric pressure increases. To this In this way, the gas flow rate per unit of time is increased at the points of the reduced bearing gap 18, the load-bearing capacity increased and the // rush back to the symmetry axis of the Bearing bush deflected until the now enlarged exit cross-section the throttle channels are in equilibrium with the now only slightly reduced bearing gap.

The embodiment of a camp according to the innovation according to Flg. 1 corresponds to a controller in which the amount of gas flowing through a valve 5 per unit of time forms the control variable, the pressure difference between the centrally directed suction pressure and spring pressure on the one hand and the pressure prevailing in chamber 9 on the other hand forms the manipulated variable. The regulation gain can be changed by changing the identifier of the spring H- . It must be noted, however, that if the spring constant is too low, undesirable vibration phenomena will occur.

Since in practice the bearings are usually unevenly / moderately loaded are, it is sufficient in many cases, the adjustable ones Arrange valves 5 only on the loaded bearing bush side.

Gesellschaft für Linde's Eismaschinen Aktiengesellschaft

Instead of the control mechanism described, other · © Find control means use. For example, the Valves 5 can also be regulated or controlled by pneumatic or hydraulic means.

In many cases, regulation is not required at all; a simple control is sufficient, e.g. easy adjustability of the valves 5 from the outside.

o, protection claims
1 drawing

Claims (9)

Protection claims e · Ssas-lubricated a plain bearing with at least two im essential radial bores having bearing bush and a common pressure space, which via throttle channels is in communication with the bores, characterized in that the opening transversely has at least one Partial number of the throttle channels (1?) By an associated one each Valve (5) is adjustable. 2. Plain bearing according to claim 1 * characterized in that a leaflet device acting on each valve (5) is provided, which depends on the opening cross-section on the respective size of the hole in question (2) adjacent bearing gap (l8) adjusted. 3. Plain bearing according to claim 1 and 2, characterized in that that the control device the opening cross-section depending on the per unit of time the throttle channel adjusted flow of gas. Gesellschaft für Linde's Eismaschinen Aktiengesellschaft 4. plain bearing according to one of claims 1 to 3 # characterized in that that they are provided with the associated valves (5) Nen throttle channels attached to the loaded bearing bush side are. 5. Plain bearing according to one of claims 1 to k, characterized in that the opening cross-sections have a Mind @ stv / ert. 6 «plain bearing according to one of claims 1 to 5 * characterized in that that the control gain is adjustable. 7. Plain bearing according to one of claims 1 to 6, characterized in that the essentially radial bores (2) on the outer face of the bearing bush (1) are designed as valve seats (3) and each have one under the influence of compression springs (4) Cooperate poppet valve (5), the shaft (6) of which has a larger cross-section than the valve disk and is guided in a respective associated radial bore (7) of a sleeve (8) which closes the bearing bush in a gas-tight manner and forms the common pressure chamber (9), with the outer surface of the sleeve is under a defined gas pressure. Gesellschaft für Linde's Eismaschinen Aktiengesellschat 8. plain bearings according to claim 6 and 7 * characterized by » that the identification of the compression springs (4) can be adjusted using stop screws (1O). 9. Plain bearing according to one of claims 1 to 8, characterized in that that the minimum opening cross-section of the valves (5) is fixed by incisions (13) in the valve seats (3) or valve plates.