Disk Brake Parking Mechanism Ball-and-Ramp Segmentation
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Solution Overview
Problem
The existing disk brake systems require complex structures to retain braking force when the parking brake is applied, leading to reduced production efficiency.
Innovation Solution
A disk brake design featuring a pair of pads facing each other across a rotor, a piston pressed by an electric motor, and a parking brake mechanism with a ball-and-ramp and screw mechanism to simplify the structure for retaining braking force, allowing the piston to be propelled and held in the braking position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complicated structure is used for retaining braking force in the parking brake mechanism, then the braking force retention is reliable, but the production efficiency is reduced
Solution Approach 1:
The parking brake mechanism is divided into two distinct functional components: a ball-and-ramp mechanism for propelling the piston to the braking position, and a separate screw mechanism for holding the piston in that position. This segmentation allows each component to be optimized for its specific function, simplifying the overall structure while maintaining reliable braking force retention.
Solution Approach 2:
The screw mechanism serves dual functions: it holds the piston in the braking position during parking brake application, and can also be used to adjust the braking force. This multi-functionality reduces the need for additional components, simplifying the structure and improving production efficiency while maintaining reliability.
2Reliability
If a complicated structure is used for the parking brake mechanism, then the braking force is reliably retained, but the device complexity increases
Solution Approach 1:
The parking brake mechanism is divided into two distinct functional components: a ball-and-ramp mechanism for propelling the piston to the braking position, and a separate screw mechanism for holding the piston in that position. This segmentation allows each component to be optimized for its specific function, simplifying the overall structure while maintaining reliable braking force retention.
Solution Approach 2:
The screw mechanism is designed to automatically maintain the braking force without requiring additional active components or complex control systems. Once the piston is propelled to the braking position by the ball-and-ramp mechanism, the screw mechanism self-locks to hold the position, providing reliable braking force retention through its inherent mechanical properties.
3Productivity
If a simplified structure is used for the parking brake mechanism, then the production efficiency is improved, but the braking force retention may be compromised
Solution Approach 1:
The parking brake mechanism is divided into two distinct functional components: a ball-and-ramp mechanism for propelling the piston to the braking position, and a separate screw mechanism for holding the piston in that position. This segmentation allows each component to be optimized for its specific function, simplifying the overall structure while maintaining reliable braking force retention.
Solution Approach 2:
The invention replaces complex mechanical retention systems with a simpler screw mechanism that utilizes fundamental mechanical principles (threaded engagement and friction) to hold the piston in the braking position. This substitution maintains reliable braking force retention while significantly simplifying the structure for improved production efficiency.
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 design simplifies the structure for retaining braking force, improving production efficiency and enabling high operational efficiency in the piston holding mechanism, allowing for desired braking force even with a downsized motor, and reducing operational noise and wear.
Implementation Method 1
a ball-and-ramp mechanism and a screw mechanism. Rotation of the electric motor causes the ball-and-ramp mechanism and the screw mechanism to move the piston to the braking position
Implementation Method 2
a ball-and-ramp mechanism and a screw mechanism. Rotation of the electric motor causes the ball-and-ramp mechanism and the screw mechanism to move the piston to the braking position, and the screw mechanism holds the piston in the braking position
Implementation Method 3
an electric motor provided on the caliper body... Rotation of the electric motor causes the ball-and-ramp mechanism and the screw mechanism to move the piston to the braking position
Data Source
AI summary
A disk brake including a simplified structure for retaining the braking force of a parking brake. The disk brake is equipped with a piston holding mechanism having a ball-and-ramp mechanism in which balls are moved by rotation transmitted from a motor, causing a rotary-rectilinear ramp to press a piston. The rotary-rectilinear ramp has an external thread engaged with an internal thread formed on a base nut that is immovable in a rotor axis direction relative to a caliper body. The external thread, when a force is applied thereto from the piston in the rotor axis direction, can retain the position of the rotary-rectilinear ramp in the rotor axis direction. Thus, the structure for retaining the braking force of the parking brake can be simplified to improve production efficiency.