Electric Disk Brake Fail-Open Layout Using a Torque Limiter
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Solution Overview
Problem
The existing electric brake apparatuses suffer from impaired layout flexibility due to the inclusion of a bracing element with a spiral spring that requires a torque equal to or greater than a predetermined value for energy storage, limiting their design flexibility.
Innovation Solution
The electric brake apparatus incorporates a torque limiter mechanism and an elastic member, such as a torsion spring, to store elastic energy and prevent excessive energy storage, allowing for improved layout flexibility and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bracing element with a spiral spring is provided at the end portion of the spindle to prevent excessive energy storage, then energy storage is controlled, but layout flexibility is impaired
Solution Approach 1:
The invention extracts the energy storage control function from the bracing element located at the end portion of the spindle and relocates it to a torque limiter mechanism positioned between the spindle and the torque transmission member. This separation allows the bracing element to be removed while maintaining the energy storage control capability through the torque limiter mechanism, thereby improving layout flexibility without compromising reliability
Solution Approach 2:
The invention introduces a torque limiter mechanism as an intermediary component between the spindle and the torque transmission member. This intermediary mechanism controls the torque transmission and prevents excessive energy storage, replacing the need for a bracing element at the spindle end. The torque limiter mechanism achieves the same protective function while allowing greater design freedom and layout flexibility
2Volume of moving object
If the brake apparatus is made compact for better mountability, then space efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The invention merges the energy storage control function with the existing torque transmission path by integrating the torque limiter mechanism into the connection between the spindle and torque transmission member. This consolidation eliminates the need for separate bracing elements and reduces overall structural complexity while maintaining compact dimensions for improved mountability
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 enhances layout flexibility and mountability on vehicles by ensuring stable operation and efficient energy storage without excessive size, while maintaining responsiveness and stability during braking and release.
Implementation Method 1
an elastic member having a one-end portion connected to the torque transmission member and an opposite-end portion connected to the fixation portion and configured to store elastic energy therein due to a rotation of the torque transmission member relative to the fixation portion
Implementation Method 2
a torsion spring having a one-end portion connected to the torque transmission member and an opposite-end portion connected to the fixation portion
Implementation Method 3
configured to cause the torque transmission member to rotate together with the rotational member until a rotational resistance force between the rotational member and the torque limiter mechanism exceeds a predetermined value
Data Source
AI summary
A fail-open mechanism employed in a disk brake that is an electric brake apparatus includes a spring clutch disposed between a spindle and a torque transmission member and configured to cause the torque transmission member to rotate together with the spindle until a rotational resistance force between the spindle and the spring clutch exceeds a predetermined value, a non-rotatably configured fixation member, and a torsion spring having a one-end portion connected to the torque transmission member and an opposite-end portion connected to the fixation member and configured to store elastic energy therein due to a rotation of the torque transmission member relative to the fixation member according to the rotation of the spindle. As a result, the disk brake can prevent or reduce the impairment of layout flexibility thereof.