Arrangement and method for adjusting a preloaded rotary table bearing
The use of a sensor-based measurement system for round table bearings adjusts rotational speed to maintain precise prestress, addressing thermal expansion issues and enhancing production accuracy.
Patent Information
- Application Number
- DE102021111369
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-05-03
- Publication Date
- 2025-07-31
- Estimated Expiration
- 2041-05-03
AI Technical Summary
Existing prestressed round table bearings in machine tools experience inaccuracies due to thermal expansion mismatch between bearing rings, leading to loss of radial prestress and reduced production quality, which conventional temperature measurements and material selection methods fail to accurately address.
A measurement pickup arrangement with sensors, including distance and temperature sensors, is used to monitor the physical distance and temperature between bearing rings, adjusting the rotational speed to maintain precise prestress by detecting and correcting deviations via an evaluation unit.
Enables quick, accurate restoration of prestress in round table bearings, improving alignment and production quality by minimizing thermal expansion effects and reducing friction-induced heat.
Smart Images
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Abstract
Claims
[1] Method for adjusting a preloaded rotary table bearing (1) during operation thereof, having an inner bearing ring (2), having an outer bearing ring (3), having at least one row of rolling elements (4.n) rolling on raceways (5.1, 5.2 - 5.6) provided by the bearing rings (2, 3), having a drive arrangement (6) which sets one of the bearing rings (2) in rotation and having a control and regulating unit (7) for detecting and regulating the speed of the bearing ring (2) driven by the drive arrangement (6), characterized bythat a measuring sensor arrangement (9) is provided, which is provided with at least one sensor (8.n), which detects the physical distance A1; A2 between the two bearing rings (2, 3) in at least one spatial direction, which extends either transversely or in the direction of the axis of rotation DA of the rotary table bearing (1), and transmits it to the control and regulating unit (7), which, by means of an evaluation arrangement (10), changes the applied speed of the driven bearing ring (2) in the event of inadmissible distances A1; A2, wherein a temperature sensor (8.1) is connected to the control and regulating unit (7) and verifies the plausibility of pure distance measurements. [2] Method according to claim 1, characterized by that the measured physical distance A1 is the radial distance between the bearing rings (2, 3). [3] Method according to claim 1 or 2, characterized bythat the speed of the rotating bearing ring (2) is reduced if the measured physical distance A1; A2 is greater than a preferred value stored in the evaluation arrangement (10). [4] Method according to claim 1 or 2, characterized by that the speed change also includes zero speed. [5] Arrangement for adjusting a preloaded rotary table bearing (1) during operation thereof, with an inner bearing ring (2), with an outer bearing ring (3), with at least one row of rolling elements (4.n) which roll on raceways (5.1, 5.2 - 5.6) provided by the bearing rings (2, 3), with a drive arrangement (6) which sets one of the bearing rings (2) in rotation and with a control and regulating unit (7) for detecting and regulating the speed of the bearing ring (2) driven by the drive arrangement (6), wherein a control and regulating unit (7) which is connected to at least one sensor (8.n) provided measuring sensor arrangement (9) is provided, with which the physical distance A1, A2 between the two bearing rings (2, 3) can be detected in at least one spatial direction which extends either transversely or in the direction of the axis of rotation of the rotary table bearing, that the control and regulating unit (7) is provided with an evaluation arrangement (10) which changes the applied speed of the driven bearing ring (2) in the event of inadmissible deviations of the distance A1; A2 and that in addition a temperature sensor (8.1) is provided and connected to the control and regulating unit (7), whereby the plausibility of pure distance measurements can be verified, . characterized by that an adapter ring (11) is connected to one of the bearing rings (2, 3) and the adapter ring (11) accommodates the measuring sensor arrangement (9), which comprises a distance sensor (8.2) and the temperature sensor (8.1). [6] Arrangement according to claim 5, characterized bythat the sensor arrangement (9) determining the distance A1, A2 is provided with contactless sensors (8.2). [7] Arrangement according to claim 6, characterized by that the non-contact sensors (8.2) are either eddy current sensors or magnetoresistive, capacitive or optical sensors.
Citation Information
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