Rotary Viscous Damper Valve Layout for Accurate Braking Torque
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Solution Overview
Problem
Existing damper devices face challenges in achieving accurate braking torque and durability due to the movable valve receiving a large load, leading to damage and reduced durability.
Innovation Solution
A damper device design featuring a rotational wing with a viscous-fluid passage and an elastic valve that opens and blocks the passage depending on the rotor's direction, using silicone oil and ethylene-propylene-diene rubber to ensure accurate braking torque and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a movable valve is used to control fluid passage, then the damper can regulate braking torque, but the valve receives large loads causing damage and reduced durability
Solution Approach 1:
The patent extracts the valve from the housing and attaches it to the rotational wing instead. This relocation allows the valve to move together with the rotational wing, reducing relative movement and load on the valve while maintaining its torque regulation function.
Solution Approach 2:
The patent combines the valve with the rotational wing into a single integrated component. The valve is fixed to the rotational wing, causing them to move as one unit, which reduces wear and load on the valve by eliminating independent movement.
2Power
If a movable valve is used to control fluid passage, then the damper can regulate braking torque, but it is difficult to obtain desired braking torque with certain accuracy
Solution Approach 1:
By extracting the valve from the housing and attaching it to the rotational wing, the patent eliminates the gap between the valve and housing that caused imprecise torque control. The valve now moves with the rotational wing, maintaining consistent positioning and improving braking torque accuracy.
3Reliability
If the valve is made of elastic material to improve durability, then the valve can deform elastically, but the material may swell when contacted with viscous fluid
Solution Approach 1:
The patent specifies using ethylene-propylene-diene rubber (EPDM) as the valve material, which is chemically resistant to silicone oil. This composite material selection provides both the elastic properties needed for durability and the chemical stability to prevent swelling when contacted with the viscous fluid.
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 enables precise control of braking torque and enhances durability by ensuring the valve only passes through a specific passage, maintaining accuracy and resisting damage from temperature changes.
Implementation Method 1
The valve is formed of an elastic member capable of deforming elastically
Implementation Method 2
A damper device is generally composed of a housing; viscous fluid filled inside the housing
Data Source
AI summary
A damper device includes a housing; a viscous fluid filled inside the housing; a rotor rotatably disposed inside the housing; and a sealing member for preventing the viscous fluid from leaking through the rotor and the housing. A rotational wing with a viscous-fluid passage is provided on one of the housing and the rotor. The rotational wing moves relative to the viscous fluid in a circumferential direction, and extends in a radial direction for dividing a housing portion of the housing filled with the viscous fluid. A valve is provided on the rotational wing, and is formed of an elastic member capable of deforming elastically. The valve opens the viscous-fluid passage when the rotor rotates in one direction, and blocks the viscous-fluid passage when the rotor rotates in the other direction.