Leaf Spring Protrusion-Recess Geometry for Rotation Restraint
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Solution Overview
Problem
Conventional leaf spring devices face space constraints and durability issues due to protruding holding plates, which can cause line contact and reduce the durability when adjacent leaf springs rotate relative to each other.
Innovation Solution
A leaf spring device design featuring a restricting protrusion on one leaf spring and a recessed part on the adjacent leaf spring, with inclined surfaces to prevent relative rotation and distribute stress evenly, thereby enhancing durability without bulkiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If holding plates are provided to prevent rotation of leaf springs, then relative rotation between adjacent leaf springs is restricted, but the device becomes bulky and space constraints are caused
Solution Approach 1:
The restricting protrusion is inserted into the recessed part formed on the adjacent leaf spring, creating a nested configuration where one structural element fits within another. This eliminates the need for external holding plates that protrude from the leaf spring assembly, thereby preventing rotation while maintaining a compact form factor without increasing device bulkiness
Solution Approach 2:
Instead of adding external holding plates to restrict rotation, the invention inverts the approach by forming a recessed part within the leaf spring itself and inserting a restricting protrusion from the adjacent spring. This internal nesting approach achieves the same rotational restriction function without external additions that would increase volume
2Stability of the object's composition
If holding plates protrude from leaf springs to prevent rotation, then relative rotation is restricted, but line contact occurs reducing durability
Solution Approach 1:
The restricting protrusion and recessed part are designed with curved contact surfaces including first and second inclined surfaces. These curved/angled surfaces ensure that when leaf springs rotate relative to each other, contact occurs across surface areas rather than at discrete line contacts, distributing stresses and improving durability through increased contact area
Solution Approach 2:
The invention changes the contact geometry parameters by designing inclined surfaces with specific angles (first inclined surface and second inclined surface). This parameter modification transforms the contact mode from line contact to surface contact, thereby improving durability while maintaining the rotational restriction function
Data Source
AI summary
A leaf spring device includes a plurality of leaf springs, in which a restricting protrusion is provided on one leaf spring, a recessed part is formed on the other leaf spring, a first side surface of the restricting protrusion and a third side surface of the recessed part face each other in a plate width direction, a second side surface of the restricting protrusion and a fourth side surface of the recessed part face each other in the plate width direction, a first inclined surface is formed on one of the first and third side surfaces to be further away from the other thereof from a central portion toward a first direction, and a second inclined surface is formed on one of the second and fourth side surfaces to be further away from the other thereof from the central portion toward a second direction.