Gearing With Radially Displaceable Teeth And Cam Disk
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Solution Overview
Problem
Existing gearings with radially displaceable teeth in a tooth carrier experience heat generation and material abrasion due to force transmission, which can be undesirable during operation.
Innovation Solution
A gearing design featuring flexurally rigid teeth with a run-in region, such as a cone, between the tooth tip and body, and a segmented bearing arrangement with pivot segments and rolling bearings, allowing radial displacement and preventing torsional bending, along with a cam disk for radial drive, to minimize heat and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If teeth are mounted in radially displaceable fashion in a tooth carrier for high transmission ratios, then transmission ratio is improved, but heat generation and material abrasion increase due to force transmission
Solution Approach 1:
A pivot segment is introduced as an intermediary component between the tooth and the cam disk profiling. This pivot segment with its spherical bearing surface allows the tooth to tilt and pivot during operation, mediating the force transmission between the cam disk and the tooth while reducing direct sliding friction and heat generation at the contact interface.
Solution Approach 2:
The tooth is designed with a run-in region featuring a conical surface that allows the tooth to dynamically adjust its position and tilt angle during operation. This dynamic adjustment enables the tooth to optimize its engagement with the toothing while reducing friction and heat generation through controlled movement rather than rigid fixed positioning.
2Ease of operation
If teeth are made displaceable in the direction of their longitudinal axis for engagement with toothing, then transmission smoothness is improved, but precision of guidance and force transmission may be compromised
Solution Approach 1:
The pivot segment features a spherical bearing surface that contacts the cam disk profiling, allowing the tooth to pivot and tilt in multiple directions while maintaining precise guidance. The spherical geometry provides smooth rotational movement while the run-in region with conical surface ensures accurate positioning and force transmission during engagement.
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 design reduces heat generation and wear by ensuring precise guidance and force transmission, maintaining high rigidity and load capacity while preventing slippage and bending deformations, thus enhancing the operational reliability of the gearing.
Implementation Method 1
a segmented bearing arrangement with pivot segments and rolling bearings
Implementation Method 2
The teeth have a run-in region, in particular with a cone, between a respective tooth tip and a respective tooth body
Data Source
AI summary
Gearing (1), comprising a toothing (5), a tooth carrier (11) with radially oriented guides with in each case one tooth root opening and one tooth tip opening, teeth (7) which are received in the guides for engagement with the toothing (5), wherein the teeth (7) are mounted in the guides so as to be displaceable in the direction of their longitudinal axis and radially relative to the tooth carrier (11), wherein a central section of the guides, respectively, has an internal profile which is uniform in the longitudinal direction of the guide, a cam disk (20) for the radial drive of the teeth (7), wherein the teeth (7) have a run-in region between a respective tooth tip and a respective tooth body.