Splined Shaft Wear Reduction via Radial Force Decoupling
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Solution Overview
Problem
The existing splined shaft connections between drive shafts and rollers in forming tools experience high wear due to the transmission of both radial forces and torques in a small space, leading to reduced service life and increased operating costs.
Innovation Solution
Decoupling the transmission of radial forces from the splined shaft connection by isolating them through separate cylindrical mating surfaces and using a tie rod for axial forces, while maintaining the splined connection for torque transmission only, and applying wear-resistant coatings and optimal lubricants to reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a splined shaft connection is used to transmit both torque and radial forces, then torque transmission is possible and radial forces can be transmitted, but high wear occurs on the connection leading to reduced service life
Solution Approach 1:
The connection structure is segmented into distinct functional zones: a first axial section for torque transmission via splined connection, and a second axial section for radial force transmission via cylindrical mating surfaces. This segmentation allows each connection element to perform its specific function without bearing combined loads, significantly reducing wear on the splined shaft connection and extending service life.
2Volume of moving object
If radial forces and torques are transmitted through a small installation space, then compact design is achieved, but wear susceptibility increases
Solution Approach 1:
The solution extends the connection structure axially by introducing a second axial section with cylindrical mating surfaces for radial force transmission. This dimensional extension allows radial forces to be transmitted separately from torque, distributing the mechanical loads over a longer axial distance rather than concentrating them in a small radial space, thereby reducing wear susceptibility while maintaining compact overall design.
3Productivity
If quick and easy roll change is implemented, then economic efficiency is improved, but the connection must handle high radial forces and torques in limited space
Solution Approach 1:
The connection is segmented into modular components with distinct functions: the splined shaft connection for torque and the cylindrical mating surfaces for radial forces. This modular segmentation enables quick roll changes while distributing the mechanical stresses across separate connection elements, preventing excessive wear that would otherwise occur in a compact single-function connection.
Data Source
AI summary
The invention relates to a device (1) for forming a workpiece, comprising a drive shaft (2) rotatable about an axis of rotation (a) and a tool (3), in particular a roller, attached thereto, wherein a positive-locking connection (4), in particular a splined shaft connection, is provided between the drive shaft (2) and the tool (3), by means of which a torque can be transmitted from the drive shaft (2) to the tool (3). In order to achieve a reduction in wear, the invention provides that the positive-locking connection (4) extends over a first axial section (5), wherein outside the first axial section (5) a second axial section (6) is provided in which the drive shaft (2) and the tool (3) have cooperating first cylindrical mating surfaces (7, 8) designed for the transmission of radial forces.