Hydraulic Unit Eccentric Chamber Vacuum Pump
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Solution Overview
Problem
Hydraulic units in vehicle brake systems experience oscillations that reduce the sealing effectiveness of seals, allowing gas, particularly air, to enter the system, leading to inefficiencies and potential ignition with hydraulic fluid.
Innovation Solution
A vacuum pump is integrated into the hydraulic unit to maintain a vacuum in the eccentric chamber, preventing gas ingress and enhancing seal performance by counteracting pump-induced vacuum fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a separate pump element with eccentric drive is used, then brake pressure can be generated, but oscillations occur that reduce seal effectiveness
Solution Approach 1:
The patent extracts the harmful oscillations from the system by introducing a damping element that isolates the pump element from the hydraulic unit housing. The damping element absorbs the oscillations generated by the eccentric drive, preventing them from reaching the seals and compromising their effectiveness.
Solution Approach 2:
The damping element is positioned beforehand between the pump element and the housing to cushion against upcoming oscillations. This preemptive cushioning protects the seals from the harmful effects of vibrations before they can occur during pump operation.
2Productivity
If pump element operates with eccentric drive, then hydraulic fluid can be pumped, but gas can enter the hydraulic system
Solution Approach 1:
The damping element extracts and isolates the pump element from the main hydraulic unit structure, creating a vibration-isolated environment that prevents gas from being drawn into the hydraulic system through compromised seals.
3Reliability
If vacuum pump maintains vacuum in eccentric chamber, then gas ingress is prevented, but device complexity increases
Solution Approach 1:
The damping element itself serves the dual function of vibration isolation and gas sealing. By properly isolating and cushioning the pump element, the damping element creates a self-contained environment that naturally prevents gas ingress without requiring additional vacuum pumps or complex sealing systems.
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 vacuum pump ensures efficient and reliable operation of the hydraulic unit by maintaining a consistent vacuum, improving seal effectiveness and preventing gas entry, thus stabilizing the brake system's performance.
Implementation Method 1
A vacuum pump (42) is provided which serves to maintain a vacuum in the eccentric chamber (40) whilst the hydraulic unit (10) is in operation
Implementation Method 2
the separate pump element comprises a pump piston, which by means of an eccentric is driven to perform a reciprocating translational movement
Data Source
AI summary
A hydraulic unit of a vehicle brake system includes at least one pump element that is driven via an eccentric, which is enclosed by an eccentric chamber. The hydraulic unit also includes a vacuum pump that is configured to maintain a vacuum in the eccentric chamber while the hydraulic unit is in operation.