Hydraulic Block Guide Section for Lubricated Brake Piston Travel
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Solution Overview
Problem
Current hydraulic blocks for external power vehicle brake systems face challenges in efficiently generating and controlling brake pressure, particularly in slip-controlled systems like ABS, ASR, and ESP, where mechanical and hydraulic interconnection of components is complex and requires effective lubrication and sealing to prevent jamming and ensure reliable brake actuation.
Innovation Solution
The hydraulic block incorporates an external power cylinder bore with a guide section and piston seals, featuring a brake fluid channel for lubrication and a radially guiding design that allows axially displaceable movement of the external power piston, ensuring smooth operation and preventing jamming, while an electromechanical drive generates brake pressure through an electric motor, screw gear, and ball screw mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the external power piston is radially guided in the guide section, then the piston can be axially displaceable without jamming, but the guide section requires additional space and increases device complexity
Solution Approach 1:
The guide section is integrated directly into the external power cylinder bore, merging the guiding function with the existing cylindrical structure. This eliminates the need for separate guiding components while still providing radial guidance through the cylindrical wall, thus reducing device complexity while maintaining axial displacability.
2Ease of operation
If the guide section has the same diameter as the external power piston, then radial guidance is achieved, but the piston may jam due to lack of clearance
Solution Approach 1:
The guide section is designed with a slightly larger diameter than the external power piston, creating a small radial clearance. This local dimensional adjustment provides both radial guidance through the cylindrical constraint and sufficient clearance to prevent jamming, resolving the contradiction between guidance and reliability.
3Ease of operation
If the guide section extends over part of the axial length of the external power cylinder bore, then radial guidance is provided during piston movement, but the overall length of the cylinder bore increases
Solution Approach 1:
The guide section extends only over the portion of the axial length where radial guidance is actually needed during piston displacement, rather than covering the entire bore length. This partial extension provides sufficient guidance functionality while minimizing the increase in overall cylinder bore length.
4Reliability
If brake fluid channels are provided in the guide section, then lubrication of the piston seal is improved, but the manufacturing complexity of the hydraulic block increases
Solution Approach 1:
Brake fluid channels are integrated into the guide section to deliver lubricating brake fluid directly to the piston seal interface. This hydraulic lubrication system improves reliability by ensuring continuous lubrication during piston movement, while the channels are designed to be manufactured using standard drilling and machining processes.
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 design enhances the reliability and efficiency of brake pressure generation and control, ensuring consistent lubrication of the piston seals and preventing dead strokes, thereby improving the overall performance and reliability of the hydraulic vehicle brake system.
Implementation Method 1
a brake fluid channel (11) is provided in the peripheral surface of the external power cylinder bore (4) in the guide section (6) on the pressure side of the external power piston (5), which extends to the piston seal (9)
Implementation Method 2
To generate a brake pressure, the external power piston can be displaced in the external power cylinder bore using an external power drive
Implementation Method 3
The external power piston is sealed in the external power cylinder bore with a piston seal, in particular a sealing ring
Data Source
Figure 1
AI summary
The invention proposes guiding an external-power piston (5) in an external-power cylinder bore (4) of a hydraulic block (2) of a hydraulic unit (1) of an externally powered hydraulic vehicle brake system in only one axially delimited guide section (6) in a radial direction and to form the external-power cylinder bore (4) with a larger diameter axially outside of the guide section (6). A brake fluid channel (11) passes through the guide section (6) up to an opening of the brake fluid line (15).