Foldable Hinge Damping Mechanism for Compact Force Amplification

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Solution Overview

Problem

Existing foldable electronic devices face challenges in providing sufficient damping force due to limited space, leading to instability and reduced user comfort during rotation of the device bodies.

Innovation Solution

A damping mechanism with a damping swing arm, damping members, and a push-pressing apparatus that amplifies damping force through a rolling body and guide surface interaction, reducing friction and enhancing durability and transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If a conventional damping mechanism is used in limited space, then the device structure remains simple, but the damping force is insufficient

Engineering Contradiction:

Improvedamping forceVSAvoidspace occupation

Core Design Contradiction:

ForceVSVolume of stationary object

Solution Approach 1:

The damping mechanism employs dynamic force amplification through the interaction between the rolling body and the inclined guide surface. As the damping swing arm rotates, the rolling body moves along the inclined guide surface, converting rotational motion into linear compression of the damping member, thereby dynamically amplifying the damping force output within a compact volume.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The mechanism changes the physical parameters of the damping force through the inclined guide surface geometry. The inclination angle of the guide surface transforms the input force from the push-pressing apparatus into an amplified output force acting on the damping member, effectively increasing the damping force parameter without proportionally increasing the mechanism's volume.

Inventive Principle:

Principle #35Parameter changes

2Force

If a larger damping mechanism is used to provide sufficient damping force, then the damping force is improved, but the space required increases

Engineering Contradiction:

Improvedamping forceVSAvoidspace occupation

Core Design Contradiction:

ForceVSArea of stationary object

Solution Approach 1:

The mechanism uses dynamic motion transformation to achieve force amplification. The rolling body's movement along the inclined guide surface creates a mechanical advantage that generates sufficient damping force in a compact area, avoiding the need for larger conventional damping components.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The inclined guide surface acts as an intermediary element between the push-pressing apparatus and the damping member. It mediates the force transmission by converting the input force into an amplified output force, enabling sufficient damping force generation within limited space.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a rolling body is introduced to reduce friction, then the durability is improved, but the device complexity increases

Engineering Contradiction:

ImprovedurabilityVSAvoidmechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mechanism replaces traditional sliding friction contacts with rolling friction through the rolling body. This substitution reduces friction and wear, improving durability while adding only one additional component (the rolling body) to the system, thereby limiting the increase in complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 mechanism provides stable damping feedback and improved user comfort by amplifying damping force while occupying less space, ensuring the device can hover at any angle and reducing abrasion.

Implementation Method 1

a rolling body and a push-pressing apparatus, where the push-pressing apparatus abuts against the rolling body, and the rolling body abuts against the first concave portion, the protrusion, or the second concave portion of the damping member

Methodology Applied

Scientific EffectRolling friction: Friction

Implementation Method 2

the protrusion has a guide surface inclined relative to the axis, and a rolling body and a push-pressing apparatus, where the push-pressing apparatus abuts against the rolling body... the guide surface is inclined relative to the axis. In this way, the push-pressing force of the push-pressing apparatus can be amplified

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Implementation Method 3

the damping mechanism has a first concave portion, a protrusion, and a second concave portion that are sequentially connected in a circumferential direction of the damping member... so that the push-pressing apparatus applies an abut-pressing force to the damping member by using the rolling body

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS12572184B2Damping mechanism, hinge apparatus, and foldable electronic device

Publication Date: 2026.03.10 HUAWEI TECH CO LTD

AI summary

A damping mechanism includes a fixed base, a damping swing arm, a rolling body, and a push-pressing apparatus. The damping swing arm is rotatably disposed on the fixed base by using a damping member. A first concave portion, a protrusion, and a second concave portion are disposed on a side wall of the damping member, and the protrusion has a guide surface inclined relative to an axis such that when the push-pressing apparatus squeezes the guide surface of the protrusion to the rolling body, the guide surface enhances a push-pressing force of the push-pressing apparatus, so that the damping member is subject to greater pressure, and torque damping is increased as the damping swing arm rotates.