Brake Damping Device Segmented Gas Volume for Short Pedal Travel
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Solution Overview
Problem
Brake system dampers face challenges in minimizing oscillations and vibrations, leading to undesired noises, due to pressure fluctuations, which result in longer pedal travel and reduced damping effectiveness as the gas volume increases, and above a predefined pressure value, the damping action is limited by the small remaining elasticity.
Innovation Solution
A brake system damping device with a first space for hydraulic pressure, a second space containing a compressible medium, and a third space connected via a passage that closes when hydraulic pressure reaches a predefined value, using a plug-type element to prevent damage and ensure smooth operation, and a diaphragm for efficient volume management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas volume of the second space is increased to achieve softer damping, then the damping effectiveness is improved, but the pedal travel length increases
Solution Approach 1:
The gas volume is segmented into two separate spaces (second space and third space) connected by a passage. The closure element divides the gas volume into an active portion (second space) and a reserve portion (third space), allowing the total gas volume to be large while the active volume remains small during high-pressure operation.
Solution Approach 2:
The system dynamically transitions between two states: below the predefined pressure value, both spaces are connected providing large gas volume for soft damping; above the predefined pressure value, the passage closes isolating the third space, providing small gas volume for short pedal travel. This dynamic switching resolves the contradiction.
2Length of moving object
If the passage is closed above predefined pressure value to limit pedal travel, then the pedal travel is reduced, but the damping action is limited by small remaining elasticity
Solution Approach 1:
The system provides different damping characteristics dynamically based on operating conditions: soft damping with long stroke at low pressures, and firm damping with short stroke at high pressures. This dynamic adaptation resolves the contradiction between limiting pedal travel and maintaining damping action.
Solution Approach 2:
The system changes the effective gas volume parameter based on pressure conditions. Below the predefined pressure value, the effective gas volume is large (second space plus third space). Above the predefined pressure value, the effective gas volume is small (only second space). This parameter change resolves the contradiction.
3Length of moving object
If the first separating element bears against the second separating element to close the passage, then the pedal travel is limited, but the second separating element may be damaged by friction or kinking
Solution Approach 1:
The plug-type element acts as an intermediary between the first separating element and the second separating element. It receives the bearing force from the first separating element and transmits it to the second separating element, preventing direct contact and damage. This resolves the contradiction between limiting pedal travel and protecting the separating element.
Solution Approach 2:
The plug-type element with its convex cap serves as a protective intermediary that distributes the contact force over a larger area and prevents kinking of the second separating element at the passage opening. This intermediary structure resolves the contradiction between achieving pedal travel limitation and ensuring component durability.
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 provides excellent damping characteristics with short pedal travel, reduced material aging, and lower pressure in the closed space, minimizing undesired effects and maintaining operational reliability while being cost-effective and long-lasting.
Implementation Method 1
The second space thus acts in the manner of a pneumatic spring, also referred to as gas spring. The softness or hardness of the damping action of this gas spring is dependent on the gas volume of the second space.
Implementation Method 2
Specifically, above the predefined pressure value, the first separating element is in particular deformed to such an extent that it then bears against the second separating element.
Implementation Method 3
By means of the plug-type element according to the disclosure, it is possible, at the associated passage, to create a support against which the first separating element, during the movement in the direction of the second separating element, can bear and thereby be supported.
Data Source
AI summary
A brake system damping device includes a first space, a second space, a third space, a first separating element, a second separating element, a closure element, and a plug-type element. The first space is configured to have hydraulic pressure applied thereto. A compressible medium is situated in the second space and the third space. The first separating element separates the first space from the second space, and the second separating element separates the second space from the third space. The second space is connected in medium-conducting fashion to the third space by a passage formed in the second separating element. The closure element is configured to be moved with the first separating element so as to close the passage in a movement direction as soon as the hydraulic pressure has reached a predefined pressure value in the first space. The plug-type element is arranged in the passage.