Tolerance Ring Protrusion Rigidity for Torque Transmission
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Solution Overview
Problem
Conventional tolerance rings for torque transmission devices are prone to eccentricity between axial members, leading to uneven surface pressure and positional displacement due to the collapse of protrusions near the gap, which increases slip torque in some areas and decreases it in others.
Innovation Solution
A torque transmitting tolerance ring with a ring body formed in a hollow cylinder shape, featuring a pair of edges with radially projecting protrusions, where some protrusions are reinforced to balance rigidity across the diametrical direction, preventing collapse and maintaining axial alignment by distributing force evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are continuously placed at regular intervals in the circumferential direction, then the torque transmission is uniform, but the protrusions near the gap collapse due to low rigidity, causing eccentricity between axial members
Solution Approach 1:
The patent applies local quality by differentiating the rigidity of protrusions based on their position. Protrusions near the gap are designed with higher rigidity (through increased height or width) compared to those in the central area. This local differentiation allows protrusions near the gap to maintain their shape and prevent collapse, while protrusions in the central area maintain regular spacing for uniform torque transmission.
Solution Approach 2:
The patent introduces asymmetry in the protrusion configuration by placing protrusions with different rigidity characteristics at different locations. Specifically, the protrusions adjacent to the gap have enhanced rigidity parameters, creating an asymmetric pattern that compensates for the structural weakness near the gap and prevents eccentricity between axial members.
2Ease of manufacture
If the ring body is made with uniform protrusion rigidity, then manufacturing is simple, but protrusions near the gap collapse under load, leading to uneven surface pressure
Solution Approach 1:
The patent implements local quality by specifying that protrusions near the gap have different dimensional parameters (height or width) compared to other protrusions. This creates localized variations in rigidity that can be achieved through standard manufacturing processes like stamping or molding, while significantly improving surface pressure uniformity and preventing collapse in critical areas.
3Stability of the object's composition
If protrusions near the gap are reinforced to prevent collapse, then axial alignment is maintained, but the device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by implementing local quality in a targeted manner. Only protrusions adjacent to the gap are reinforced with increased height or width, while the majority of protrusions in the central area maintain their original simpler configuration. This selective reinforcement maintains axial alignment without requiring complex modifications throughout the entire structure.
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 effectively prevents eccentricity between axial members, ensuring uniform surface pressure and preventing positional displacement, thereby enhancing the performance and reliability of torque transmission devices.
Implementation Method 1
a ring body (11) made of an elastic plate and formed in a substantially hollow cylinder shape
Data Source
AI summary
This tolerance ring, which is for a torque transmission device, preferably has a ring body that comprises an elastic plate and is roughly a hollow cylindrical shape having a pair of edges that extend in the axial direction. The ring body has: a plurality of protrusions that are arranged along the peripheral direction and preferably protrude in the radial direction; a first region having a number of the protrusions including the pair of protrusions adjacent to the pair of edges; and that is positioned at the diametrically opposite side from the first region. The pair of protrusions has the same rigidity as one of the protrusions of the second region.