Roll Journal Bearing Closure with Pressure Ring Preload Relief
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Solution Overview
Problem
Existing bearing closure devices for roll journals require the use of a crane rope to tighten or loosen the ring nut, posing safety risks and inaccuracy in positioning, and the screws used for preload remain under constant stress during operation.
Innovation Solution
A bearing closure device with a pressure ring and rotatably mounted screws that apply the necessary force for drawing the bearing onto the roll journal, allowing the screws to be relieved of axial compressive force during operation, and utilizing an end cap and ring nut arrangement for controlled axial tension during drawing off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a crane rope is used to tighten or loosen the ring nut, then the bearing can be drawn on or drawn off the roll journal, but operator safety risks increase and positioning accuracy decreases
Solution Approach 1:
The patent extracts and eliminates the crane rope from the bearing installation system. Instead of using a crane rope to tighten the ring nut, the invention uses a dedicated drawing device with a drawing screw that directly applies axial force to draw the bearing onto the roll journal, removing the hazardous element while improving positioning accuracy through controlled mechanical engagement.
Solution Approach 2:
The patent introduces a drawing device as an intermediary between the ring nut and the bearing. This drawing device includes a drawing screw that converts rotational motion into controlled axial movement, mediating the force application process to eliminate the need for crane ropes while providing precise positioning control during bearing installation.
2Ease of manufacture
If screws are used to apply preload to the bearing, then the bearing can be drawn on the roll journal, but the screws remain under permanent compressive stress during operation
Solution Approach 1:
The patent segments the functions of bearing installation and operational support. The drawing screw is used only during the installation phase to draw the bearing onto the roll journal, after which it can be removed or disengaged. During operation, the bearing is supported by its own structural features (such as the roll journal shoulder or retaining rings), not by the drawing screws, thereby eliminating permanent compressive stress on the screws.
Solution Approach 2:
The drawing screws are engaged only periodically during the bearing installation process, not continuously during operation. The screws apply axial force to draw the bearing onto the roll journal, then are disengaged or removed, allowing the bearing to be supported by other structural elements during normal operation, thus avoiding permanent stress on the screws.
Data Source
AI summary
A bearing closure device has a externally threaded ring that can be slid onto a roll journal. One stop close to the roll barrel and one stop away from the roll barrel are provided on the roll journal in order to limit the axial movement of the threaded ring. A ring nut with an internal thread is screwed onto the external thread of the threaded ring. To facilitate safe screwing on and unscrewing of the ring nut and to keep screws pressure-free during the operation of the bearing a pressure ring is mounted between the bearing and the threaded ring in an axially displaceable manner. In addition, a plurality of screws can be screwed into axial threaded bores in the threaded ring in order to press against the pressure ring in the axial direction. Finally, the ring nut can be screwed or adjusted against the pressure ring.