Cam-Driven Displaceable Gear Teeth for Lower Heat and Wear
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Solution Overview
Problem
Existing gearings with radially displaceable teeth in a tooth carrier experience heat development and material abrasion due to contact forces during force transmission, leading to undesired operational conditions.
Innovation Solution
A gearing design featuring teeth with a shoulder projecting inward from the tooth body to the flank, allowing for reduced heat development and wear, with the teeth being flexurally rigid and mounted to be displaceable along their longitudinal axis within guides in the tooth carrier, and utilizing a cam disk for driving, which reduces contact forces and enhances lever action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If teeth are mounted displaceable in the tooth carrier for engagement with the tooth system, then high transmission ratios are achieved, but heat development and material abrasion occur due to contact forces
Solution Approach 1:
A cam disk is introduced as an intermediary element between the driving mechanism and the teeth. The cam disk converts rotational motion into controlled linear displacement of the teeth, mediating the force transmission and reducing direct contact forces between teeth and tooth carrier, thereby reducing heat development and material abrasion while maintaining high transmission ratios
2Power
If teeth are mounted displaceable in the tooth carrier for engagement with the tooth system, then high transmission ratios are achieved, but material abrasion occurs due to contact forces
Solution Approach 1:
The cam disk serves as a mediator that distributes and softens the contact forces during tooth displacement. By controlling the engagement through the cam profile, the direct impact and sliding friction between teeth and tooth carrier are reduced, minimizing material abrasion while preserving the high transmission ratio capability
3Strength
If a shoulder is provided projecting back from the tooth body to the tooth flank, then lever action is improved and load capacity increases, but tooth structure complexity increases
Solution Approach 1:
The shoulder feature adds a dimensional element to the tooth structure by projecting backward from the tooth body toward the tooth flank. This creates an additional lever arm in the radial direction, improving mechanical advantage and load capacity. The complexity increase is minimal as it involves a simple geometric modification rather than adding separate components
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 achieves reduced heat development and wear, improved lever action, and increased load capacity, while simplifying manufacturing and reducing splash losses in the tooth system contact.
Implementation Method 1
a cam disk for driving the teeth along the respective longitudinal axis of the teeth
Data Source
AI summary
A gearing, in particular a coaxial gearing or a linear gearing, comprising a tooth system, a tooth carrier having guides, teeth received within the guides for engagement with the tooth system, wherein the teeth are mounted within the guides to be displaceable in the direction of their longitudinal axis relative to the tooth carrier, a cam disk for driving the teeth along the respective longitudinal axis of the teeth, wherein at least one of the teeth respectively has a tooth flank area having tooth flanks, and a tooth body, wherein, between the tooth body and the tooth flanks, one shoulder respectively is provided, which projects back from the tooth body to the inside towards the tooth flank.