Double-Sided Helical Toothed Belt for Axial Force Cancellation
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Solution Overview
Problem
Conventional toothed belts with helical toothing suffer from transverse forces that lead to axial movement and wear, necessitating rim disks, which increase friction and mechanical losses.
Innovation Solution
A toothed belt with two oppositely oriented toothings, where the helix angles of the first and second toothing are oriented in opposite directions, canceling out transverse forces and eliminating the need for rim disks, thereby reducing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If helical toothing is used on both sides of the toothed belt, then running smoothness is improved and power transmission is enhanced, but transverse forces arise causing axial movement and wear
Solution Approach 1:
The patent applies asymmetry by configuring the two toothings on opposite sides of the toothed belt with different helix angles. The first toothing has a helix angle of +α while the second toothing has a helix angle of -α. This asymmetric configuration ensures that the transverse forces generated by each toothing cancel each other out, eliminating axial movement while maintaining the running smoothness benefits of helical toothing.
2Stability of the object's composition
If rim disks are added to prevent axial movement, then axial migration is constrained, but friction and mechanical losses increase
Solution Approach 1:
The patent extracts and eliminates the need for rim disks by using oppositely oriented helical toothings. The transverse forces from the two toothings cancel each other out, naturally preventing axial movement without requiring additional rim disk components. This removes the source of friction and mechanical losses that would otherwise be generated by the rim disks.
3Ease of manufacture
If identically oriented helical toothings are used on both sides, then manufacturing is simplified, but transverse forces cause axial migration requiring additional components
Solution Approach 1:
The patent uses asymmetric helix angles (+α and -α) for the two toothings, which can be manufactured using standard helical gear manufacturing processes. The asymmetry is achieved through conventional machining by controlling the direction of helix formation during manufacturing, maintaining ease of manufacture while avoiding the need for additional axial constraint components.
Data Source
AI summary
The invention relates to a toothed belt (10a, 10b) with two mutually oppositely arranged running surfaces (2, 4), wherein, on the running surfaces (2, 4), there are arranged toothings (12, 14) arranged obliquely with respect to the axial direction (X), wherein the obliquity is defined in each case by helix angles (16, 18) between the axial direction (X) and the direction of the tooth flanks of the respective toothings (12, 14). It is provided that the helix angle (16) of the first toothing (12) is oriented oppositely to the helix angle (18) of the second toothing (14).