Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-06-10
2001-02-20
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S001000, C384S583000
Reexamination Certificate
active
06190052
ABSTRACT:
The invention relates to a method for changing the clamping conditions between a shaft bearing and a rotatable part, which is rotatably disposed in the shaft bearing, and in the case of which the axis of rotation of the rotatable part is arranged axially identically with the axis of rotation of the shaft bearing, as well as to a shaft bearing for a rotatable part which is rotatably disposed in a shaft bearing and whose axis of rotation is arranged axially identically with the axis of rotation of the shaft bearing, according to the preamble of claim
1
and
6
.
In machine construction, rotatable parts are generally rotatably held by means of shaft bearings or pivot bearings, such as ball bearings, tapered-roller bearings, slide bearings, etc. In the case of rotatable part/shaft bearing connections, changes of the clamping conditions, as, for example, a play, may occur. The changes are generally not static but may change, particularly as a result of thermal effects. Various effects are connected with the change of the clamping conditions of the rotatable part in the shaft bearing. Thus, particularly the natural frequencies and/or the vibration amplitudes of the rotatable parts will change. Sometimes, a compensation of the occurring changes will be achieved in that the rotatable part/shaft bearing connection is prestressed particularly by a spring or by an elasticity of the material, the prestressing partially affecting bearing shells.
Compensation arrangements of this type are known, for example, from German Patent Documents DE 195 41 245 A1, DE 38 10 448 C2, DE 93 01 334 U1 or DE 31 23 590 A1.
It is an object of the invention to provide a method by means of which the changes of the clamping conditions can be reduced as much as possible and preferably can, in addition, also be changed in a targeted manner.
According to the invention, this object is achieved by means of a method and by means of a shaft bearing whereby as a result of the targeted and reversible change of the radial course of a radial adjusting unit having piezoelements and of the contact pressure radially affecting the rotatable part, the clamping conditions can be changed during the operation by a targeted intervention from the outside. In the case of the radial adjusting unit, the intervention takes place by the application of an electric voltage. In the above-mentioned manner, for example, a play, which changes because of temperature influences, can occur during the operation of the rotatable part. This is meaningful, for example, for a compensation of the play.
In addition, the invention can also be used for the purpose of changing the resonance or natural frequency during the transmission or introduction of vibrations. The respective resonance frequencies are important for the transmission of vibrations between components and for the introduction of vibrations from one component to another component. The mathematical relationship of this frequency-dependent energy transmission or vibration transmission is called transmission function.
By means of the invention, as a result of a change of the clamping conditions, for example, the values of the natural vibrations of the rotatable part and thus the corresponding transmission function can be changed in a special manner. The change of the transmission function changes, particularly at least reduces the transmission of vibrations, thus of the transmittable energy, which comes from the rotatable part, into another component.
This method and this arrangement can expediently be used in the case of rotatable parts of electric motors, as particularly rotors, but also in airplane engines, for example, propeller or jet engines.
In a preferred manner, the use of the invention is also expedient in the case of a crankshaft and/or camshaft of an internal-combustion engine, preferably a diesel engine or gasoline engine, as a rotatable part because, in a simple fashion, the introduced vibrations and of these particularly the sound emission inside an occupant compartment of a combustion-engine-driven vehicle can be influenced. The influencing of the noise level, which the operator of a vehicle perceives, in particular, as disturbing and which comes at least partially from the engine, takes place at the site where it arises and not, as previously customary, only at the site where the operator perceives it. In an advantageous manner, this reduces, among other things, the expenditures with respect to the electronic control system and the equipment construction (microphone, loudspeaker and the like).
REFERENCES:
patent: 4850719 (1989-07-01), Moseley et al.
patent: 5221146 (1993-06-01), Maruyama
patent: 5238308 (1993-08-01), Lang et al.
patent: 5397183 (1995-03-01), Lu et al.
patent: 5564840 (1996-10-01), Jurras, III et al.
patent: 31 23 590 (1983-01-01), None
patent: 36 06 042 (1986-09-01), None
patent: 38 10 448 (1988-10-01), None
patent: 39 00 121 (1990-07-01), None
patent: 93 01 334 U (1993-05-01), None
patent: 42 27 366 (1994-02-01), None
patent: 195 41 245 (1997-05-01), None
patent: 695 08 203 (1999-07-01), None
patent: 0 377 145 (1990-07-01), None
patent: 2 279 999 (1995-01-01), None
patent: 61-127922 (1986-06-01), None
patent: 1-266320 (1989-08-01), None
Schnur Juergen
Tomaschko Silvia
Daimler-Chrysler AG
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Hannon Thomas R.
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