Brake Pressure Generator Pivot Bearing Fixation Against Negative Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydraulic blocks for vehicle braking systems face challenges in effectively managing brake fluid pressure due to the lack of a robust mechanism to counteract the negative pressure generated during the piston's return stroke, which can lead to instability in brake pressure regulation.
Innovation Solution
The hydraulic block incorporates a power brake pressure generator with a threaded drive and a pivot bearing supported by an annular step, which converts rotary motion into axial shifting of the piston. This design includes a pivot bearing holder and a caulking mechanism to securely fasten the pivot bearing, effectively bracing against the negative pressure force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threaded drive with pivot bearing is used to shift the piston, then the brake pressure can be regulated by converting rotary motion to axial motion, but the negative pressure during return stroke causes instability in brake pressure regulation
Solution Approach 1:
The patent applies preliminary anti-action by introducing a counteracting force mechanism that anticipates and compensates for the negative pressure effect during piston return stroke. The additional piston or spring mechanism creates an opposing force that prevents the pressure instability before it occurs, ensuring stable brake pressure regulation throughout the entire piston cycle.
2Device complexity
If the pivot bearing is directly supported at the orifice of the cylinder hole, then the structure is simplified, but the negative pressure force cannot be effectively braced
Solution Approach 1:
The patent resolves this contradiction by transitioning from direct axial support to indirect support via an annular step, introducing a dimensional intermediate structure. The annular step provides a distributed support surface that effectively braces against the negative pressure force while maintaining structural simplicity, solving both the complexity and strength requirements.
3Reliability
If caulking is used to hold the pivot bearing, then the pivot bearing is securely fastened against negative pressure, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies self-service by designing the caulking mechanism to utilize the hydraulic block's own material plasticity for fastening the pivot bearing. The caulking process deforms the hydraulic block material itself to create a form-locked connection, eliminating the need for additional fastening components or complex assembly procedures, thus maintaining ease of manufacture while ensuring reliable fixation.
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 solution enables stable and controlled regulation of brake pressure by effectively managing the negative pressure generated during the piston's return stroke, ensuring consistent and reliable brake performance.
Implementation Method 1
a threaded drive that converts a rotary driving motion into a shift and shifts the piston in the cylinder hole in a rotary drive
Implementation Method 2
A caulking or, generally speaking, a plastic deformation of the material of the hydraulic block that surrounds the orifice of the cylinder hole holds the pivot bearing at the hydraulic block
Data Source
AI summary
A pivot bearing of a ball screw of a power brake pressure generator for a hydraulic vehicle braking system is fastened at a hydraulic block with the aid of a sleeve that has an internal circumferential edge, which engages from above with the pivot bearing on a front face facing away from the hydraulic block. The sleeve has a flange that is caulked in an annular step in the hydraulic block.