Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C32/00—Bearings not otherwise provided for
  • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
  • F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
  • F16C32/0692—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for axial load only
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
  • F16C23/02—Sliding-contact bearings
  • F16C23/04—Sliding-contact bearings self-adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
  • F16C25/02—Sliding-contact bearings
  • F16C25/04—Sliding-contact bearings self-adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C32/00—Bearings not otherwise provided for
  • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
  • F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
  • F16C32/0696—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for both radial and axial load

Definitions

• the present invention relates to a hydraulic axial bearing for a radially-supported rotatable shaft or axle.
• an axially- adjustable bearing system which can withstand heavy and variable axial thrust loads.
• One example of this is in the cellulose processing industry, where a multi- purpose axial mill can be subjected to thrust loads on the order of 100 tons, while at the same time having to satisfy high demands for accuracy in axial positioning, in order to achieve an exact grinding gap.
• the axial bearing system mentioned in the PCT publication uses two hydrostatic axial bearings, one on either side of a flange-like pressure plate which is anchored to the shaft or is formed integrally with it.
• Another system is shown in SE 464 370, where two flanges are used instead of one, with the bearings acting in opposed directions, away from one another.
• an hydraulic axial bearing for a radially supported rotating shaft has a fixed flange, a substantially axial sealing gap formed between the flange and an outer sealing ring, and an inner, substantially radial sealing gap formed between the shaft and an inner sealing ring confined in the bearing housing, and means for supplying hydraulic pressure medium to the cavity formed between the sealing gaps, to absorb the axial loadings applied to the axle.
• two such bearings are provided, one on each axial side of the flange.
• the outer sealing ring has low mass, and consequently low moment of inertia, resulting in a closer adaptation to the vibrations of the flange.
• An inner radial gap provides a larger utilized hydraulic area, which provides a higher loading capacity.
• F1G.1 shows a double-sided bearing arrangement as incorporated in the invention.
• FIG.2 shows an exposed and enlarged axial sealing ring, in which the pressure in the cavity is explained as a function of the geometry and the pressure applied to the pressure chamber by the pilot valve.
• FIG.3 shows an enlargement of the inner sealing ring, illustrating the drop of pressure of the medium along the radial gap.
• FIG. 4 shows a practical application of a double- sided bearing arrangement according to the invention.
• the axle 1 or shaft is radially mounted or supported at a distance from one or both sides of a fixed flange 1a.
• each of two axially opposed bearing housings, 4, 5, surrounding the flange 1a there is an outer, axial sealing ring 2 and 3 respectively, which can be displaced within its outer pressure chamber, 4b and 5b, and sealed by means of the seals 2a and 3a respectively.
• a hydraulic pressure medium is applied from the pumps 15 and 16, through the lines C and D to the cavities 10 and 11 formed between sealing gaps 2, 3 and 8,9, by the flange 1a, the axial sealing rings 2, 3, portions 4',5' of the housing 4, 5 and the inner radial sealing rings 4a, 5a.
• This medium is expelled from the cavities through the fixed radial gaps 8, 9, and the adjustable outer, axial sealing gaps 6, 7, which causes a drop in pressure that affects the flange 1a.
• the pilot valve is assisted by a sensor 13 which monitors the position of the axle.
• the evacuation flow is indicated in the figure by I, J and G, H respectively.
• Figure 2 shows an exposed and enlarged axial sealing ring, in which the pressure in the cavity is explained as a function of the geometry and the pressure applied to the pressure chamber by the pilot valve.
• the pilot valve can be programmed to keep the axle in a certain position irrespective of external loadings, and to adjust the position of the axle during operation.
• Figure 3 shows an enlargement of the inner sealing ring 5a, illustrating the drop of pressure of the medium along the radial gap.
• the axle is mounted in spherical axial roller bearings 18 and 19, to have a radial mounting free from play but with some axial load-absorbing capacity.
• the bearing housings 4, 5 form the piston in a linear hydraulic motor with the outer cylinder 20, 21.
• the linear hydraulic motor has two pressure chambers 4c, 5c.
• the volume and pressure of hydraulic medium is regulated via the lines E, F by means of a hydraulic pilot valve 12 and a position sensor 13.
• Pressure chambers 4c and 5c communicate directly with the respective pressure chambers 4b and 5b of the bearing, through the lines A and B, in order to absorb the axial loadings applied to the hydraulic motor, in the manner of "slave" bearings.
• the hydraulic motor is thus operated to adjust the axial position of the axle, and the hydraulic bearings are applied to absorb axial loadings, which can vary in weight and direction.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Support Of The Bearing (AREA)
• Sealing Devices (AREA)
• Mechanical Sealing (AREA)
• Sliding-Contact Bearings (AREA)
• Magnetic Bearings And Hydrostatic Bearings (AREA)
• Sealing Of Bearings (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=20397105

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (5)

• 1995
  • 1995-02-07 SE SE9500424A patent/SE508141C2/sv not_active IP Right Cessation
• 1996
  • 1996-02-06 EP EP96908455A patent/EP0808427A4/de not_active Withdrawn
  • 1996-02-06 WO PCT/US1996/001435 patent/WO1996024777A1/en not_active Ceased
• 1997
  • 1997-07-30 NO NO973491A patent/NO973491L/no unknown
  • 1997-08-07 FI FI973250A patent/FI973250A7/fi unknown

Non-Patent Citations (1)

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