Helical Deceleration Mechanism With Arc Tooth Engagement
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Solution Overview
Problem
Conventional deceleration mechanisms, such as those described in Patent literature 1, face limitations in increasing the deceleration ratio without increasing the size of the mechanism, due to the interference and engagement issues arising from the small number of teeth on the helical gears.
Innovation Solution
The deceleration mechanism employs a first gear with a spiral tooth and an engagement projected part, and a second gear with inclined teeth and engagement recessed parts, allowing for an arc-shaped engagement structure that increases the deceleration ratio without size increase by maintaining one tooth on the first gear and increasing the number of teeth on the second gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of teeth on the driven side helical gear is increased to increase the deceleration ratio, then the deceleration ratio is improved, but the adjacent teeth become arranged close to each other and the engagement surface becomes flat, causing interference between teeth and deterioration in engagement state
Solution Approach 1:
The invention applies curvature to the engagement surface by forming it as an arc-shaped surface with a predetermined radius of curvature. This curved engagement surface prevents the teeth from interfering with each other even when the number of teeth is increased, thereby maintaining reliable engagement while achieving higher deceleration ratios. The curved surface ensures that the engagement points are properly distributed and prevents the flat surface problem that occurs with conventional involute gears.
2Power
If the difference in the number of teeth between the helical gear and driven side helical gear is increased to increase the deceleration ratio, then the deceleration ratio is improved, but the size of the deceleration mechanism must be increased
Solution Approach 1:
The invention changes the geometric parameters of the engagement surface, specifically forming it as an arc-shaped surface with a predetermined radius of curvature instead of using conventional involute tooth profiles. This parameter change allows for increased tooth count difference and higher deceleration ratios within the same spatial constraints, as the curved engagement surface optimizes the meshing geometry to fit more teeth in the same circumferential space without increasing the overall mechanism size.
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
This configuration enhances the deceleration ratio while maintaining a compact size, preventing interference and ensuring smooth engagement between the gears, thus overcoming the size limitations of conventional mechanisms.
Implementation Method 1
a first tooth part arranged in the first gear and extending spirally in the axial direction of the first gear, an engagement projected part arranged on the first tooth part, formed in an arc shape in a direction orthogonal to the axial direction of the first gear
Implementation Method 2
a first tooth part arranged in the first gear and extending spirally in the axial direction of the first gear
Data Source
AI summary
A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.