Parking Brake Lever Mechanism Reducing Operation Stroke
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional parking brake operating apparatuses face difficulties in achieving optimal operation stroke due to structural limitations, making it challenging to apply sufficient braking force efficiently.
Innovation Solution
The apparatus incorporates a connecting member with shoe insert grooves, a first operation lever with a larger rotation radius connected to a brake cable, and a second operation lever with engaged gear teeth, allowing for reduced operation stroke while maintaining the distance the brake shoe is moved by utilizing a combination of levers and gear engagement to distribute the force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single operation lever is used in a conventional parking brake apparatus, then the structure is simple, but the operation stroke is insufficient to achieve optimal braking force
Solution Approach 1:
The single operation lever is divided into two separate operation levers (first operation lever and second operation lever). Each lever independently pushes a brake shoe, allowing the brake cable force to be distributed and amplified across two leverage points, thereby increasing the effective operation stroke and braking force without requiring a single excessively long lever
Solution Approach 2:
The connecting member serves as an intermediary component that receives force from the brake cable and distributes it to both operation levers. This mediator structure enables force multiplication and stroke extension by converting the cable's linear motion into coordinated rotational motion of two levers, resolving the contradiction between simple structure and sufficient operation stroke
2Ease of operation
If the rotation radius of the operation lever is increased to reduce operation stroke, then the lever becomes longer and harder to install, but a smaller radius would require even more stroke
Solution Approach 1:
Instead of using one long lever with large rotation radius, the system segments the leverage function across two shorter levers with smaller individual rotation radii. The combined effect of both levers achieves the necessary force multiplication and stroke reduction without requiring any single lever to be excessively long
Solution Approach 2:
The system transitions from a single-dimension lever arrangement to a two-dimension coordinated lever system. By arranging two levers at different positions and orientations around the connecting member, the system achieves force distribution and stroke optimization in multiple spatial dimensions, reducing the need for any single lever to be overly long
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 configuration reduces the operation stroke required for activating the parking brake without compromising the distance the brake shoe is moved, simplifying installation and potentially lowering costs by leveraging existing apparatus designs.
Implementation Method 1
The other end of the first operation lever and the one end of the second operation lever can be respectively provided with gear teeth and engaged with each other
Implementation Method 2
a first operation lever having one end rotatably combined with the connecting member and contacting with one of the brake shoes; and a second operation lever having one end combined with the other end of the first operation lever and the other end rotatably combined with the connecting member
Data Source
AI summary
An apparatus for operating a parking brake that can reduce an operation stroke. A connecting member has shoe insert grooves with brake shoes inserted into both sides thereof. A first operation lever has one end rotatably combined with one side face of the connecting member and contacts with one of the brake shoes. A second operation lever has one end combined with the other end of the first operation lever and the other end rotatably combined with the other side face of the connecting member and contacts with the other one of the brake shoes.