Self-Propelled Milling Cutter Drum Drive Axial Compensation
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Solution Overview
Problem
Surface milling cutters face challenges in achieving leakage-free and dust-tight sealing of the drum drive unit without axial constraints and bearing overloads, particularly due to thermal expansions and component tolerances, which complicates maintenance and assembly.
Innovation Solution
The drum drive unit is designed with an axial degree of freedom, allowing it to move relative to the drum body along the axis of rotation, using a torque-transmitting and radially supporting entrainment connection that compensates for axial offsets and dissipates bearing forces, thereby avoiding axial constraints and overloads, and incorporating a lubricant reservoir to prevent fretting rust and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drum drive unit is rigidly connected to the drum body to ensure stable torque transmission, then torque transmission reliability is improved, but axial constraints and bearing overloads occur due to thermal expansion and component tolerances
Solution Approach 1:
The drum drive unit is designed with axial mobility, allowing it to move dynamically in the axial direction relative to the drum body. This dynamic adjustment capability enables the drive unit to compensate for thermal expansion and manufacturing tolerances while maintaining stable torque transmission through the spline connection, thereby resolving the contradiction between reliable torque transmission and avoiding axial bearing overloads.
2Reliability
If the drum drive unit is axially constrained to prevent offsets and ensure sealing, then sealing reliability is improved, but assembly and maintenance complexity increases due to adjustment requirements
Solution Approach 1:
The drum drive unit incorporates self-adjusting axial mobility that automatically compensates for thermal expansion and component wear during operation. The spline connection and guiding mechanism enable the drive unit to self-position axially without requiring manual adjustment or shimming, thereby maintaining reliable sealing while significantly reducing assembly and maintenance complexity compared to rigidly constrained designs.
3Manufacturing precision
If the drum drive unit is designed with axial mobility to compensate for thermal expansion, then manufacturing tolerance sensitivity is reduced, but torque transmission stability may be compromised
Solution Approach 1:
A spline connection serves as an intermediary mechanism between the drum drive unit and the drum body. This spline interface provides both axial mobility for thermal expansion compensation and positive mechanical engagement for stable torque transmission. The guiding surfaces of the spline connection ensure that axial movement occurs smoothly without compromising the rotational torque transfer, thereby resolving the contradiction between tolerance sensitivity and torque transmission stability.
Data Source
AI summary
The present disclosure relates to a self-propelled surface milling cutter, with a working assembly comprising a rotatingly drivable drum body, and at least one drum drive unit which is accommodated in the interior of the drum body and forms at least part of a rotatable bearing of the drum body on a drum supporting frame, wherein the at least one drum drive unit includes a stationary drive part attached to the drum supporting frame and a rotatable drive part connected with the drum body. The rotatable drive part of the drum drive unit is mounted on the drum body by a positive entrainment connection in a torque-transmitting, but longitudinally movable manner. The entrainment connection rotatorily entrains the drum body, in order to be able to transmit the rotary drive movements of the drive part to the drum body.