Eccentric Bearing Drive Layout for Compact Calender Deflection
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Solution Overview
Problem
Existing drive devices for eccentric bearings in tight installation spaces are bulky due to the arrangement of pivot levers extending away from the cylinder axis, occupying significant space and being unsuitable for compact designs.
Innovation Solution
The drive device incorporates eccentric bushings with free ends coupled to drive units, allowing axial rotation for radial deflection, utilizing tangential drive units and gear outputs for space-efficient adjustment, with independent rotation of bushings and motors positioned to minimize space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pivot levers are arranged on the outer face of the bearing and displaced in radial direction to adjust eccentricity, then the eccentricity adjustment function is achieved, but the device occupies large space and is unsuitable for tight installation spaces
Solution Approach 1:
The patent transitions from radial displacement of pivot levers to axial displacement of the eccentric bushing. The drive unit moves the eccentric bushing along the axial direction (perpendicular to the roller axis) rather than radially, fundamentally changing the dimension of adjustment motion. This dimensional shift enables compact radial layout while maintaining full eccentricity adjustment capability.
Solution Approach 2:
The drive unit is positioned within the axial overlap area of the eccentric bushings, nesting the actuation mechanism inside the existing bearing structure. The drive shaft and drive gear are contained within the space between the two eccentric bushings, eliminating the need for external pivot levers and reducing the overall footprint.
2Adaptability or versatility
If pivot levers extend away from the cylinder axis in both horizontal and vertical directions, then the eccentric rings can be adjusted, but the device becomes bulky and space-consuming
Solution Approach 1:
The adjustment mechanism moves from two-dimensional radial plane motion (horizontal and vertical pivot lever displacement) to one-dimensional axial motion (drive unit displacement along the roller axis). This reduces the adjustment path from a large radial arc to a compact linear axial stroke, dramatically reducing device volume while preserving adjustment range.
Solution Approach 2:
The eccentric bushing itself becomes the dynamic element that translates axial displacement into radial eccentricity variation. By making the eccentric bushing movable in the axial direction rather than using fixed pivot levers, the system achieves versatile adjustment with minimal structural footprint.
3Ease of operation
If the eccentric bearing uses traditional pivot lever mechanism for radial deflection, then the deflection function is achieved, but the installation space requirement increases
Solution Approach 1:
The patent reorients the deflection mechanism from radial plane operation to axial direction operation. The drive unit displaces the eccentric bushing axially, and the eccentric geometry converts this axial motion into radial deflection of the roller journal. This dimensional transformation reduces the installation length in radial directions while maintaining full deflection capability.
Data Source
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AI summary
The invention relates to a drive device for an eccentric bearing for radially deflecting a roller mounted therein, the eccentric bearing comprising a bore which is oriented in an axial direction and intended for accommodating a roller journal of a roller, and the eccentric bearing comprising an outer eccentric bushing and an inner eccentric bushing which is partially inserted into the outer eccentric bushing and has the bore, such that the eccentric bushings have an axial overlap region, characterized in that at least one of the eccentric bushings has a free end outside the overlap region, which free end is coupled to a drive unit via which the at least one eccentric bushing is rotatable about the axial direction in order to adjust a radial axial deflection of the bore with respect to the other eccentric bushing. The invention also relates to a corresponding calender.