Staircase Support Ring for Milling Drum Assembly
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Solution Overview
Problem
The existing milling drum systems for road milling machines face difficulties in the assembly and disassembly of interchangeable milling tubes due to the penetration of dirty water and fine particles into the gap between the support ring and support ring mount, making disassembly challenging and requiring significant effort, especially when the support ring is short relative to the milling drum's diameter.
Innovation Solution
The implementation of a staircase-shaped design for the supporting surfaces on the support ring and support ring mount with complementary surfaces of decreasing diameters, allowing for incremental disengagement and reduced axial length, along with the option of filling annular chambers with anti-corrosive agents or lubricants, and the use of a push-off device for mechanical or hydraulic assistance in disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a support ring with a predetermined play is used between the support ring and support ring mount, then the milling tube can be assembled with some tolerance, but dirty water and fine particles penetrate the gap making disassembly difficult
Solution Approach 1:
The support ring and support ring mount are divided into multiple axial steps with complementary supporting surfaces at different diameters. This segmentation creates discrete engagement zones that prevent continuous contamination pathways while maintaining assembly tolerance through the stepped geometry.
Solution Approach 2:
The solution transitions from a single-plane support interface to a multi-level axial structure. By distributing supporting surfaces across multiple axial positions with decreasing diameters, the design creates a three-dimensional engagement pattern that blocks contamination while preserving operational tolerance.
2Length of moving object
If the support ring is made short in relation to the milling drum diameter, then the overall structure is more compact, but disassembly becomes very difficult or impossible
Solution Approach 1:
Both the support ring and support ring mount feature multiple axial steps creating discrete supporting surfaces. This segmentation allows a short support ring to achieve effective disengagement through cumulative step-by-step separation, maintaining compactness while enabling complete disassembly.
Solution Approach 2:
The stepped geometry is pre-configured with decreasing diameters in the pulling direction, creating predetermined separation paths. This preliminary structural arrangement ensures that during disassembly, each step sequentially disengages, making the process straightforward despite the short axial length.
3Ease of operation
If conical supporting surfaces are used, then assembly is simplified, but radial play increases when the milling drum is too short
Solution Approach 1:
The conical surface is segmented into multiple axial steps with flat supporting surfaces at each level. This segmentation maintains the self-aligning benefit of conical geometry while the discrete steps provide fixed radial positioning, eliminating excessive radial play in short milling drums.
Solution Approach 2:
Each axial step provides a localized supporting surface with specific geometric properties. The combination of gradual diameter reduction (inheriting conical alignment benefits) and discrete step heights (providing fixed radial positioning) creates locally optimized support zones that prevent both assembly difficulty and radial instability.
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
This design simplifies the assembly and disassembly process by reducing the required disengagement distance to one-fifth of the original length, maintaining a stable supporting surface, and facilitates easier assembly and disassembly while preventing seizing, thereby improving operational efficiency and reducing maintenance complexity.
Implementation Method 1
The capillary attraction of the clearance fit intensifies this effect, so that dirty water and fine-grained particles penetrate the fit.
Implementation Method 2
Due to the staircase-shaped design of the supporting surfaces of the support ring and the support ring mount, the milling tube has to be pulled off in an amount corresponding to the width of one step only to disengage the support ring with the support ring mount
Implementation Method 3
the option of filling annular chambers with anti-corrosive agents or lubricants, and the use of a push-off device for mechanical or hydraulic assistance in disassembly
Data Source
AI summary
In a milling drum (2) for a construction machine, in particular a road milling machine (1) or a recycler, with an interchangeable milling tube (4) arranged coaxially to the axis (20) of the milling drum, where the milling tube (4) is supported, by means of a support ring (8), on a support ring mount (12) of a rotating body coupled to a milling drum drive (16), it is provided that the support ring (8) and the support ring mount (12) of the rotating body display several complementary supporting surfaces (22, 24) arranged coaxially to the axis (20) of the milling drum, where the said supporting surfaces (22, 24) have different supporting circle diameters and are arranged behind one another axially with their diameters decreasing incrementally in the pulling direction.