Rolling Mill Spindle Coupling Lubrication for High-Load Areas
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Solution Overview
Problem
In rolling facilities, it is challenging to appropriately supply lubricant oil to the high load area of the spindle coupling due to the narrow gap, often resulting in insufficient oil supply or excessive oil in the low load area.
Innovation Solution
A spindle design with a female coupling part and rotary joint featuring oil supply passages that communicate with annular oil passages, allowing for targeted lubrication of specific areas within the engagement recess, including high and low load zones, ensuring adequate lubrication across all areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricant oil is supplied to the engagement portion of the coupling, then the low load area receives excessive oil, but the high load area receives insufficient oil due to narrow gap
Solution Approach 1:
The engagement recess is divided into multiple areas (high load area and low load area) and each area is supplied with lubricant oil through separate oil supply passages. This segmentation allows independent control of oil supply to each area, ensuring adequate lubrication to the high load area with narrow gap while preventing excessive oil supply to the low load area with wide gap.
Solution Approach 2:
Different oil supply passages are configured with different characteristics (number, position, orientation) to match the specific lubrication needs of different areas. The high load area receives oil through passages positioned and oriented to reach the narrow gap, while the low load area receives oil through separate passages, creating locally optimized lubrication quality for each region.
2Reliability
If oil supply passages are increased to reach high load area, then lubrication improves, but device complexity increases
Solution Approach 1:
The oil supply system is segmented into multiple passages, each responsible for supplying oil to specific areas of the engagement recess. This segmentation enables targeted lubrication without requiring excessive oil supply, as each passage is optimized for its specific target area.
Solution Approach 2:
The rotary joint with annular oil passages serves multiple functions: it supplies oil to multiple different areas (high load and low load areas) through a single integrated component, reducing the need for separate complex oil supply systems for each area.
Data Source
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AI summary
A spindle for transmitting a rotational driving force to a mill roll includes: a female coupling part having at one end side an engagement recess capable of receiving an engagement projection of a male coupling part; and a rotary joint including an annular rotor part disposed at another end side of the female coupling part and configured to rotate together with the female coupling part, and an annular stator part disposed on an outer peripheral side of the annular rotor part. The female coupling part includes at the one end side a pair of protruding portions each of which has a facing surface defining the engagement recess. The female coupling part has a plurality of oil supply passages for supplying oil to the engagement recess. The rotary joint has a plurality of annular oil passages each of which communicates with any of the plurality of oil supply passages. The plurality of oil supply passages includes at least one oil supply passage disposed corresponding to each of four areas obtained by dividing the engagement recess by a center line between the pair of facing surfaces and a straight line perpendicular to the center line, in a cross-section perpendicular to an axial direction of the spindle. The at least one oil supply passage disposed corresponding to one area of the four areas communicates with, among the plurality of annular oil passages, an annular oil passage different from an annular oil passage with which the at least one oil supply passage disposed corresponding to an area adjacent to the one area of the four areas communicates.