Hydraulic Brake Pressure Generator Internal Force Management
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Solution Overview
Problem
Existing pressure generators for hydraulic vehicle brake systems face challenges in efficiently managing axial tensile and compressive forces, often requiring external support and compromising compactness due to the need for external force management.
Innovation Solution
The pressure generator employs a piston-cylinder unit with a helical gearing system, where a rotatable component drives an axially movable component via a thread engagement, supported by an axial bearing, allowing internal force management without external support, and incorporates an electric hollow-shaft motor and planetary gear set for rotational speed reduction and compact construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional ball screw drive with external force support is used, then the pressure generator can manage axial forces, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines the piston-cylinder unit directly with the helical gearing by rigidly connecting the piston to the axially movable component. This merging eliminates the need for separate external force support structures, as the piston itself becomes part of the force transmission path through the helical gearing to the rotatable component.
Solution Approach 2:
The patent nests the piston-cylinder unit within the helical gearing structure by having the piston radially fixed to the axially movable component, which is guided by the tubular collar. This nested arrangement allows force transmission through the helical gearing components themselves rather than requiring external support structures.
2Device complexity
If a compact pressure generator is designed without external force support, then the device complexity is reduced, but the internal force management becomes more challenging
Solution Approach 1:
The flange part serves multiple functions by simultaneously connecting the piston-cylinder unit to the helical gearing and providing mounting surfaces. This merging of functions simplifies the overall structure while maintaining proper force transmission paths from the piston through the helical gearing to the rotatable component.
Solution Approach 2:
The tubular collar performs multiple functions: it guides the piston axially, supports the axially movable component of the helical gearing, and provides structural connection between components. This multi-functionality reduces the number of separate parts needed while maintaining proper force management.
3Force
If the piston is rigidly connected to the helical gearing component, then force transmission is improved, but the axial movement guidance becomes more difficult
Solution Approach 1:
The piston is radially fixed to the axially movable component, creating a nested arrangement where the piston is contained within the component structure. The tubular collar then guides this nested assembly axially, providing smooth movement while maintaining rigid force transmission from the piston through the helical gearing.
Solution Approach 2:
The tubular collar acts as an intermediary between the piston and the external environment, providing axial guidance for both the piston and the axially movable component of the helical gearing. This intermediary structure enables smooth axial movement while maintaining the rigid force connection between the piston and helical gearing.
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 configuration enables a compact, efficient pressure generation system that internally manages forces, eliminating the need for external support and providing axially movable guidance, enhancing the system's structural integrity and operational efficiency.
Implementation Method 1
The helical gearing has a rotatable, axially fixed component which has a thread, and an axially movable, rotationally fixed component which has a counterpart thread, the counterpart thread of which engages directly or indirectly, for example via rolling bodies, with the thread of the rotatable component of the helical gearing
Implementation Method 2
The act of the rotatable component of the helical gearing being driven in rotation causes the axially movable component of the helical gearing to be moved axially
Implementation Method 3
The disclosure also provides an axial bearing which serves for axially supporting and rotatably mounting the rotatable component of the helical gearing
Implementation Method 4
a piston-cylinder unit with a cylinder and with a piston which is movable in the cylinder
Data Source
AI summary
A pressure generator for a hydraulic vehicle brake system includes a piston-cylinder unit, a piston, a ball screw drive configured to move the piston, an electric hollow-shaft motor that surrounds and is configured to drive the ball screw drive, and a planetary gear set configured to transmit a rotational movement of the hollow-shaft motor to the ball screw drive. The generator also includes a flange part, a sleeve, and an axial needle-roller bearing. The flange part has a tubular collar configured to axially guide the piston in a movable fashion therein. The sleeve has a flange configured as a counterbearing which is attached to an interior of the tubular collar, and is further configured to support the bearing. The bearing is configured to rotatably mount and axially support the ball screw drive.