Printing Press Roller Axial Floating Bearing Thermal Expansion
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Solution Overview
Problem
The service life of antifriction bearings in printing presses is reduced due to thermally induced axial stresses and high bearing loading, which existing solutions fail to adequately address.
Innovation Solution
A printing press design featuring a first antifriction bearing configured as an axial floating bearing with significant axial movement play and a second antifriction bearing as an axial locating bearing with negligible movement play, along with a centering device to align the rings, allowing for thermal expansion compensation and reducing axial stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If temperature control liquid is pumped into the cavity of the roller to control temperature, then temperature control is achieved, but thermally induced axial stresses and high bearing loading occur which reduce service life
Solution Approach 1:
The patent changes the axial constraint parameter of the bearing system by introducing axial movement play between the rolling bodies and the second ring. This allows the bearing to accommodate thermal expansion parameter changes without generating excessive axial stresses, thereby maintaining reliability under temperature control operations
Solution Approach 2:
The patent transforms the rigid axial constraint into a dynamic system by allowing axial movement of the rolling bodies within the bearing. This dynamic capability enables the bearing to adapt to thermal expansion and contraction of the roller while maintaining proper alignment through the centering device
2Ease of operation
If the roller is rapidly removed and inserted into roller sockets for cleaning, then ease of operation is improved, but the bearing loading and wear increase due to thermal expansion compensation requirements
Solution Approach 1:
The patent modifies the bearing's axial constraint parameter to include movement play, enabling it to compensate for thermal expansion during rapid roller changes without increasing bearing loading or wear
3Reliability
If axial movement play is introduced to compensate for thermal expansion, then bearing service life is extended, but alignment precision may be compromised
Solution Approach 1:
The patent introduces a centering device as an intermediary mechanism between the floating bearing and the roller socket. This centering device ensures that the bearing maintains proper alignment precision while the floating design allows axial movement for thermal expansion compensation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively compensates for thermal expansion, reducing axial stresses and extending the service life of antifriction bearings by allowing for axial movement while maintaining proper alignment and rotation functionality.
Implementation Method 1
The temperature control necessarily has the consequence of a change in the length of the roller. Thermally induced axial stresses and, as a consequence, high bearing loading, are associated with the change in length
Implementation Method 2
A roller (24) having a first antifriction bearing (6) and a second antifriction bearing (7) is inserted into roller sockets (2, 3) configured as quick action changing devices. The roller has a cavity and is connected to a temperature control liquid circuit when the roller is inserted into the roller sockets. A temperature control liquid which circulates in the temperature control liquid circuit is pumped into the cavity of the roller, in order to control the temperature of the latter
Data Source
AI summary
A printing press includes a roller having a first antifriction bearing and a second antifriction bearing. The first antifriction bearing has rolling bodies, a first ring and a second ring. One of the two rings forms an outer ring and the other of the two rings forms an inner ring. Roller sockets are configured as quick action changing devices for receiving the anti-friction bearings during insertion of the roller into the printing press. The first antifriction bearing is configured as an axial floating bearing with a considerable axial movement play of the rolling bodies between the latter and one of the rings. The second antifriction bearing is configured as an axial locating bearing without such a considerable axial movement play. A centering device centers one of the rings relative to the other.