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
  • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
  • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
  • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
  • F16C35/061—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing mounting a plurality of bearings side by side
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/25—Movable or adjustable work or tool supports
  • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
  • B23Q1/262—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members with means to adjust the distance between the relatively slidable members
  • B23Q1/265—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members with means to adjust the distance between the relatively slidable members between rotating members
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
• • 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
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
  • F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
• • 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
  • F16C2322/00—Apparatus used in shaping articles
  • F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators

Definitions

• the invention relates to a bearing arrangement according to the Oberbegri f of claim 1.
• the work spindle e.g. a lathe in the area of the spindle nose in roller bearings with ball-cylindrical rollers, in roller bearings with tapered rollers, in plain bearings, in hydrostatic bearings or in hydrodynamic bearings, usual angular contact ball bearings are supplied by the manufacturer with different Vc voltages. Bearings with a low preload are normally used. In order to achieve optimum conditions for double-row cylinder lengths with a tapered bore with regard to the pretension required in use, it is also known to make the cone on the main spindle positive on the pitch in order to
• this cantilever arm can often not be precisely defined, since it cannot be guaranteed that the outer bearing has the greatest preload and therefore also the greatest rigidity.
• This cantilever arm which is used to calculate the stiffness with the third power, can extend into the middle if the prestressing of the individual bearings is not sufficiently defined
• Bearings extend to performance and accuracy adversely affects the entire bearing arrangement. This disadvantage occurs especially when the workpiece to be machined is only picked up in a chuck without additional support.
• the invention is based on the object of designing the bearing arrangement of the type mentioned at the beginning in such a way that the effective cantilever is as short as possible and its length is defined as far as possible and remains approximately constant under load.
• this bearing Due to the larger diameter of the work spindle in the area of the outer bearing, this bearing receives a greater preload than the other bearings. In this way it is achieved that the cantilever arm, which decisively determines the rigidity of the spindle, extends only up to approximately the middle of this outer bearing. By appropriate dimensioning it can be achieved that this optimal length of the cantilever remains constant even under the usual loads and thus the operating conditions can be precisely defined. Since it is necessary with Lageranordnu gene of the type mentioned to achieve a balanced design with regard to the bias, one strives to apply approximately the same bias to the outer and inner bearings, while the middle bearing should be free of bias.
• a spacer is used between the middle and the inner bearing, which consists of an outer ring and an inner ring concentric therewith, which has a smaller width than the outer ring.
• FIGS. 1 and 2 based referred to as', for example, explained. It shows:
• FIG. 2 shows an enlarged detail from FIG. 1.
• the bearing arrangement according to the invention is an arrangement with angular contact ball bearings in tandem-O arrangement with an outer bearing 11 and a middle bearing 12, both of which have lines of action inclined at the same angle, and with an inner bearing 13 with an opposite inclination Line of action.
• the bearings 11 to 13 are arranged in the bore of the machine housing 17 of a lathe and sit on the working spindle 16 thereof.
• the spindle 16 has a step 21 in the area of the outer bearing 11 and thus a larger diameter than in the area of the middle bearing 12 and the inner bearing 13. Because of the larger diameter, the outer bearing 11 is preloaded more than that other bearings, so that the cantilever, which is designated in Fig. 1 with a, has a precisely defined length and only extends approximately to the middle of this bearing, while if the preload of the outer bearing 11 is insufficient, ie with a larger preload e.g. of the middle bearing 12, the cantilever arm a can extend to the middle bearing 12.
• the section of the spindle 16 which has a larger diameter extends beyond the area of the outer bearing 1.1.
• a labyrinth seal 19 is located outside the outer bearing 11.
• the bearing arrangement is secured to the outside by a cover ring 20 which is fastened to the machine housing 17 by screws.
• the portion of the spindle 16 which has a larger diameter is shown with a reinforced line for clarity.
• between the middle inner bearing 13 uses a spacer, which consists of an outer ring 14 and a concentric inner ring 15, which has a smaller width than the outer ring.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Support Of The Bearing (AREA)
• Turning (AREA)
• Rolling Contact Bearings (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6331151

Family Applications (1)

Country Status (5)

Families Citing this family (4)

Citations (7)

• 1987
  • 1987-07-08 DE DE19873722572 patent/DE3722572A1/de active Granted
• 1988
  • 1988-07-08 US US07/336,353 patent/US4924524A/en not_active Expired - Fee Related
  • 1988-07-08 DE DE8888110965T patent/DE3865254D1/de not_active Expired - Lifetime
  • 1988-07-08 JP JP63505862A patent/JPH01502652A/ja active Pending
  • 1988-07-08 WO PCT/EP1988/000613 patent/WO1989000090A1/de unknown
  • 1988-07-08 EP EP88110965A patent/EP0298509B1/de not_active Expired - Lifetime

Patent Citations (7)

Non-Patent Citations (4)

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