Disc Brake Pad Linkage for Smooth Strength Machine Braking
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Solution Overview
Problem
Existing disc brake systems in strength training machines suffer from the stick-slip phenomenon, leading to jerky sliding, noise, vibrations, and increased effort required for startup, due to brake pads being fixed to non-rotating points and contacting the disc only along a line, which results in uneven braking force.
Innovation Solution
The brake pads are mounted on rotating arms with a hinged connector, allowing them to make full surface contact with the brake disc, and are connected via a spring system with a rocker, reducing perpendicular contact force and enabling smoother braking through elastic rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If brake pads are fixed to non-rotating points and contact the disc only along a line, then the structure is simple, but jerky sliding and stick-slip phenomenon occur
Solution Approach 1:
The brake pads are mounted on rotating arms that can pivot about a fixed point, transforming the static contact into dynamic contact. The arms rotate in response to braking forces, allowing the brake pads to maintain optimal contact with the disc surface throughout the braking process, eliminating stick-slip phenomenon and jerky sliding.
Solution Approach 2:
The brake pad mounting is divided into separate rotating arms rather than a fixed rigid mounting. Each arm can independently rotate to accommodate the braking force distribution, allowing the brake pads to contact the disc along a broader area rather than a single line, improving braking smoothness.
2Device complexity
If brake pads contact the disc only along a line, then the structure is simple, but braking force is uneven
Solution Approach 1:
The rotating arms dynamically adjust the brake pad position and contact point based on the braking force applied. This dynamic adjustment ensures that the braking force is distributed evenly across the disc surface rather than concentrated at a single line contact point, achieving uniform braking force distribution.
Solution Approach 2:
The brake pad contact is extended from a one-dimensional line contact to a two-dimensional surface contact through the rotating arm mechanism. The arms rotate to allow the brake pads to contact the disc across a broader area, improving force distribution uniformity.
3Device complexity
If brake pads are fixed to fixed points, then the structure is simple, but noise and vibrations increase
Solution Approach 1:
The rotating arm mechanism absorbs vibrations and reduces noise by allowing controlled movement of the brake pads relative to the disc. The rotational degree of freedom enables the system to accommodate irregularities in contact without transmitting high-frequency vibrations and noise to the machine frame.
Solution Approach 2:
The rotating arms act as intermediary elements between the brake pads and the fixed mounting structure. They mediate the contact forces and vibrations, filtering out high-frequency components and reducing the transmission of noise and vibrations to the machine structure.
4Force
If greater perpendicular contact force is applied, then braking force increases, but stick-slip phenomenon worsens
Solution Approach 1:
The rotating arms dynamically adjust the contact force distribution during braking. Instead of applying a constant high perpendicular force that causes stick-slip, the system allows the arms to rotate and adapt the contact force in real-time, maintaining smooth braking even at higher force levels.
Solution Approach 2:
The system changes the parameter of contact force distribution from a static high perpendicular force to a dynamically adjusted force distribution. The rotating arms modify the effective contact force and distribution during braking, allowing higher braking force without inducing stick-slip phenomenon.
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 minimizes jerky sliding and stick-slip effects, providing smoother and more consistent braking force, reducing noise and wear, and allowing for easier adjustment of braking force.
Implementation Method 1
the friction between the brake pads and the brake disc maintains the braking force
Implementation Method 2
The brake pads are pressed against the brake disc by a spring
Data Source
AI summary
A disc brake structure for machines, primarily for strength training machines, comprises a brake disc, the frame of the machine, and at least one pull spring or pressure spring, the spring is connected to two brake pads, a brake pad retaining bracket is connected to the brake pad, and the brake disc has a brake disc axis. One end of the brake pad retaining bracket is fixed to the frame with a back-and-forth movable connecting device, the other end of the brake pad retaining bracket is fixed to the brake pad with a hinged connector element, and the brake pad retaining bracket is obliquely connected to the brake pad in the direction of rotation of the brake disc.