Auxiliary Brake Disc Intermediate Member Friction Control
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Solution Overview
Problem
Existing additional brake devices for passenger transport devices, such as escalators, experience excessive friction and wear leading to increased deceleration beyond the required 1 m/s² due to direct contact between brake and wheel disc surfaces, resulting in scratches and cold welding, which compromises braking performance.
Innovation Solution
Incorporating an intermediate member made of metal or alloy material between the inner circumferential surface of the brake disc and the outer circumferential surface of the wheel disc extension, coupled via interference fit or coating, to minimize friction and prevent wear, while maintaining stable braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If direct contact is maintained between the inner circumferential surface of the brake disc and the outer circumferential surface of the wheel disc extension, then braking force is sufficient, but friction and wear increase leading to scratches and cold welding
Solution Approach 1:
A lubricating layer is introduced between the inner circumferential surface of the brake disc and the outer circumferential surface of the wheel disc extension. This intermediate lubricating layer reduces direct metal-to-metal contact, thereby minimizing friction and wear while preventing scratches and cold welding during braking operations.
2Object-affected harmful factors
If Teflon washers are added to increase lubricity, then friction is reduced, but braking deceleration exceeds the required 1 m/s²
Solution Approach 1:
The lubricity parameters of the contact surface are adjusted by introducing a lubricating layer with optimized characteristics. This modifies the friction properties to reduce wear while maintaining braking deceleration within the required limit of less than 1 m/s², avoiding excessive slip during braking.
3Reliability
If friction torque increases due to accumulation of scratches and cold welding, then braking performance deteriorates, but the brake disc and wheel disc surfaces are already damaged
Solution Approach 1:
A lubricating layer is applied in advance to the contact surfaces between the brake disc and wheel disc extension. This preliminary protective measure prevents the formation of scratches and cold welding during normal operation, thereby avoiding the subsequent increase in friction torque and deterioration of braking performance.
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 reduces friction and wear, maintaining consistent braking performance and preventing excessive deceleration, thereby ensuring compliance with deceleration standards and extending the lifespan of brake components.
Implementation Method 1
an intermediate member is provided between the inner circumferential surface of the brake disc and the outer circumferential surface of the extension of the wheel disc
Implementation Method 2
a first friction plate being provided between the brake disc and the wheel disc body; and a pressure holding mechanism which maintains a pressure between the brake disc and the wheel disc
Data Source
Figure 1~2
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Figure 4
AI summary
An additional brake device comprises: a brake disc (31) defining a hole and having an inner circumferential surface (311); a wheel disc (33') having a wheel disc body and an extension, the extension being fitted into the hole of the brake disc (31) and having an outer circumferential surface, and a first friction plate (321) being provided between the brake disc (31) and the wheel disc body; and a pressure holding mechanism which maintains a pressure between the brake disc (31) and the wheel disc (33'), wherein an intermediate member (34) is provided between the inner circumferential surface (311) of the brake disc (31) and the outer circumferential surface of the extension of the wheel disc (33'), the intermediate member (34) comprising a metal or alloy material. The intermediate member (34) is coupled to the inner circumferential surface (311) of the brake disc (31) or the outer circumferential surface of the extension of the wheel disc (33'). The additional brake device provides a stable braking deceleration.