Spring-Loaded Damping Element for Hydraulic Brake Leakage Compensation
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Solution Overview
Problem
In passive accumulator-less hydraulic brake systems, leakage leads to pressure loss in the hydraulic circuit, necessitating frequent pump startups, causing wear and potentially motor failure, especially in systems with small-volume braking force generators and higher pressures.
Innovation Solution
A spring-loaded damping element is connected to the hydraulic circuit for intermediate buffering of a leakage compensation oil volume, allowing temporary storage of oil between restart and switch-off pressures, reducing the need for pump startups due to leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydraulic pump is activated frequently to compensate for leakage losses, then the pressure in the hydraulic circuit is maintained, but the wear of the motor and pump combination increases leading to potential failure
Solution Approach 1:
The damping element is pre-filled with a leakage compensation oil volume (0.3 to 1 cm³) that is prepared in advance to compensate for leakage losses. This preliminary action allows the system to handle leakage without immediate pump activation, reducing wear while maintaining pressure.
Solution Approach 2:
The spring-loaded damping element provides beforehand cushioning by storing a small volume of hydraulic oil that can be used to compensate for leakage. The spring element pre-absorbs pressure variations and provides a buffer that protects the pump from frequent activations caused by minor leakage.
2Volume of moving object
If the brake force generator is made smaller with higher pressures, then the braking system becomes more compact, but leakage causes more significant pressure drops requiring frequent pump startups
Solution Approach 1:
The damping element provides beforehand cushioning by storing a small volume of hydraulic oil (0.3 to 1 cm³) that can be used to compensate for leakage losses. The spring element pre-absorbs pressure variations and provides a buffer that protects the high-pressure system from frequent activations caused by minor leakage, which is particularly important in compact high-pressure systems.
Solution Approach 2:
The damping element acts as an intermediary between the brake force generator and the hydraulic pump. It mediates the pressure variations caused by leakage in the compact high-pressure system, providing a buffer that prevents direct transmission of pressure drops to the pump, thereby reducing frequent startups.
3Stability of the object's composition
If spring elements in the brake force generator are used, then the brake force generator characteristics are maintained, but the spring elements relax over time causing the force generator to become weaker
Solution Approach 1:
The damping element provides feedback by monitoring pressure variations in the hydraulic circuit. When pressure drops due to leakage or spring relaxation, the damping element responds by releasing stored oil volume, which compensates for the pressure loss and maintains stable brake force generator characteristics over time.
Solution Approach 2:
The damping element with spring-loaded piston provides self-service by automatically compensating for pressure losses without external intervention. The spring element expands or contracts based on pressure conditions, self-regulating the leakage compensation oil volume delivery to maintain system performance.
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 damping element effectively compensates for leakage losses, reducing wear and extending the service life of the motor and pump combination by maintaining sufficient oil volume and stabilizing the braking force generator's characteristics.
Implementation Method 1
a spring-loaded damping element for intermediate buffering of a leakage compensation oil volume is connected in the pressure line of the hydraulic circuit
Implementation Method 2
a cylinder chamber for the leakage compensation oil volume is formed in the damping element between a cylinder head and a spring-loaded piston
Data Source
Figure 1~2
AI summary
The invention relates to a passive accumulator-free hydraulic braking system in which a hydraulic pump (2) driven by a motor (1) generates an oil pressure that feeds a pressure line (5) of a hydraulic circuit (6) via a check valve (4), the pressure line (5) supplying a hydraulic feed pressure to at least one brake caliper (10) that is connected thereto. A spring-biased damping element (12) for temporarily buffering a leakage-compensating oil volume is connected to the pressure line (5) of the hydraulic circuit (6).