Rotary Damper Flow Path Adjustment for Braking Torque Tuning

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Solution Overview

Problem

The existing rotary damper's braking force adjustment mechanism is cumbersome due to the need for equalizing bolt fastening degrees, making it difficult to uniformly adjust the rotor's pushed-in length and thus the braking torque.

Innovation Solution

A flow path with adjustable protrusion length in the cylindrical chamber, allowing for easy adjustment of the viscous fluid flow rate and braking torque by inserting an adjustment bolt into specific holes, which can alter the flow path's length and thereby control the braking torque.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple bolts are used to fix the lid to the case via an elastic member for adjusting braking torque, then the braking torque can be adjusted, but the adjustment process becomes cumbersome due to the need to equalize bolt fastening degrees

Engineering Contradiction:

Improvebraking torque adjustment capabilityVSAvoidadjustment operation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The invention extracts the adjustment function from a multi-bolt system and concentrates it into a single bolt mechanism. The single bolt directly adjusts the pushed-in length of the rotor by rotating, eliminating the need for multiple bolts and the complex equalization process while maintaining the braking torque adjustment capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The single bolt serves multiple functions: it acts as both the adjustment mechanism and the positioning element. By rotating the single bolt, the user can simultaneously control the pushed-in length of the rotor and thereby adjust the braking torque, combining what was previously distributed across multiple bolts into one universal adjustment element

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the lid is used to push the rotor into the cylindrical chamber for adjusting braking torque, then the braking torque can be adjusted, but the structure becomes complex with multiple components

Engineering Contradiction:

Improvebraking torque adjustabilityVSAvoidadjustment mechanism structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention removes the intermediate elastic member from between the bolt and the rotor. The bolt directly contacts and pushes the rotor into the cylindrical chamber, extracting the unnecessary intermediate component and simplifying the overall structure while maintaining the adjustment functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using the lid as the primary adjustment element (as in the prior art), the invention inverts the approach by using the bolt as the direct adjustment element that pushes the rotor. This inversion eliminates the need for the lid to perform adjustment functions and simplifies the mechanism

Inventive Principle:

Principle #13The other way round (Inversion)

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 solution enables straightforward adjustment of braking torque by modifying the protrusion length of the adjustment bolts, simplifying the process and improving the ease of use in adjusting the braking force.

Implementation Method 1

viscous fluid filled in the cylindrical chamber

Methodology Applied

Scientific EffectViscous flow: Viscous Damping

Implementation Method 2

a seal member is attached to an end surface (the surface facing the inner peripheral surface of the cylindrical chamber) of the vane so as to close the slight gap between the vane and the inner peripheral surface of the cylindrical chamber. This seal member has a check valve of elastic material for opening and closing the flow path formed in the vane

Methodology Applied

Scientific EffectCheck valve mechanism: Valve

Implementation Method 3

the pressure on the viscous fluid on the side of the second side surface of the vane is increased, and strong braking torque is generated

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 4

a rotary damper that generates braking torque against applied rotating force

Methodology Applied

Scientific EffectBraking torque generation: Friction

Data Source

PatentEP3467336B1Rotary damper

Publication Date: 2022.02.16 OILES CORP

Figure 1(A)~1(B)
Figure 2
Figure 3(A)~3(C)

AI summary

Provided is a rotary damper that makes it possible to easily adjust braking torque. A rotary damper (1) that has a partitioning part (3) and first and second adjustment bolts (8a), (8b). The partitioning part (3) has: first and second flow paths that connect regions of a partitioned cylindrical chamber (200); a first insertion hole that connects to the first flow path and to a first adjustment bolt screw hole (208a) of a case (2); and a second insertion hole that connects to the second flow path and to a second adjustment bolt screw hole (208b) of the case (2). The first adjustment bolt (8a) is screwed into the first adjustment bolt screw hole (208a) and is thereby inserted into the first insertion hole, and the length to which it protrudes into the first flow path can be adjusted. The second adjustment bolt (8b) is screwed into the second adjustment bolt screw hole (208b) and is thereby inserted into the second insertion hole, and the length to which it protrudes into the second flow path can be adjusted.