Gearing with Cam Disk Profiling for Radial Tooth Displacement
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Solution Overview
Problem
Existing gearings with radially displaceable teeth experience significant friction-induced heat losses due to high loads on pivot segments, which are not efficiently managed by current designs.
Innovation Solution
A coaxial or linear gearing system with flexurally rigid teeth and a segmented bearing arrangement, utilizing pivot segments mounted on rolling bearings with rim bearing surfaces, and needle rollers to minimize friction and enhance force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rolling bearings and pivot segments are used to mount teeth on the cam disk, then the teeth can be radially displaceable and engage with the toothing, but friction-induced heat is generated and losses increase
Solution Approach 1:
The patent replaces the traditional rolling bearing and pivot segment mechanism with a cam disk profiling that directly drives the teeth radially. The cam disk has a specific profile shape that converts rotational motion into radial displacement of teeth without requiring intermediate rolling elements or pivot segments, thereby eliminating friction-induced heat losses while maintaining radial displacability.
Solution Approach 2:
The invention extracts and removes the rolling bearings and pivot segments from the tooth mounting system. By eliminating these intermediate components, the patent reduces the number of moving parts and friction interfaces, directly addressing the energy loss problem while preserving the essential function of radial tooth displacement through the cam disk profiling alone.
2Force
If pivot segments are used to support teeth radially, then teeth can be forced in the direction of the toothing, but the pivot segments are subject to considerable loads
Solution Approach 1:
The patent replaces the pivot segment force transmission mechanism with a direct cam disk-to-tooth force transmission system. The cam disk profiling is designed to directly force the teeth in the radial direction toward the toothing without intermediate pivot segments, thereby eliminating the load-bearing requirements for separate pivot segment components while maintaining effective force transmission.
3Productivity
If high transmission ratios are realized through small relative movement between toothing and teeth, then compact design is achieved, but the mounting mechanism becomes critical and complex
Solution Approach 1:
The patent replaces the complex mounting mechanism (rolling bearings + pivot segments) with a simplified cam disk profiling system. The cam disk's profile shape alone provides both the radial displacement and force transmission functions, reducing device complexity while maintaining the high transmission ratio achieved through small relative movement between the toothing and teeth.
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
The solution reduces heat generation and improves load capacity and torsional resistance while maintaining high rigidity and low weight, ensuring efficient force transmission and reduced friction losses.
Implementation Method 1
rolling bodies which are arranged on the running surface between the rims, and a multiplicity of pivot segments which are arranged in encircling fashion on the rolling bearing bodies
Implementation Method 2
friction-induced heat is also generated. Such losses are undesirable
Data Source
AI summary
Gearing (1), in particular coaxial gearing or linear gearing, having a toothing (5), a tooth carrier (11) in which there is received a multiplicity of teeth (7) for engagement with the toothing, wherein the teeth (7) are mounted so as to be radially displaceable relative to the tooth carrier (11), a cam disk (20) for the radial drive of the radially displaceably mounted teeth (7), wherein the cam disk (20) has two encircling rims, between which there is arranged a raceway, rolling bodies (23) which are arranged on the running surface between the rims, and a multiplicity of pivot segments (24) which are arranged in encircling fashion on the rolling bearing bodies and which lie in each case by way of a rolling bearing surface against the rolling bodies (23), wherein, on both sides of the rolling bearing surface, there is arranged in each case one rim bearing surface, wherein the two rim bearing surfaces lie at least partially against the rims.