Linear Unit with Integrated Threaded Nut for Compact Brake Actuation
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Solution Overview
Problem
Existing linear units for motor vehicle brake systems with rotational/translational gears, such as those using ball screws, have complex setups and high manufacturing costs due to the need for precise alignment and longer axial lengths, which complicates assembly and increases packaging space requirements.
Innovation Solution
A modular design comprising premountable subassemblies of an electric motor and a gear housing with a rotational/translational gear, where the threaded nut is non-rotatably engaged with the force transmission member using intermeshing teeth and a spring element, allowing for simplified assembly and reduced packaging by converting rotational movement into translational movement with a hydraulic actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball screw with threaded nut directly connected to the rotor is used, then the linear unit achieves functional operation, but the axial overall length becomes considerable and manufacturing costs increase
Solution Approach 1:
The patent merges the threaded nut and force transmission member into a single integrated component. The threaded nut is non-rotatably engaged with the force transmission member using intermeshing teeth, eliminating the need for separate connection elements and reducing axial length while maintaining functional operation.
Solution Approach 2:
The threaded nut is nested within the force transmission member through non-rotatable engagement using intermeshing teeth. This nested configuration allows the threaded nut to be contained within the structure of the force transmission member, minimizing axial protrusion and reducing overall length.
2Reliability
If a ball screw with flattened push rod and perforation securing method is used, then the threaded spindle can be secured against rotation, but the set-up becomes complicated and manufacturing costs increase
Solution Approach 1:
The patent combines the securing function and force transmission function into a single integrated threaded nut component. The intermeshing teeth between the threaded nut and force transmission member provide both rotational securing and force transmission simultaneously, eliminating the need for separate flattened push rod and perforation components.
Solution Approach 2:
The threaded nut secures itself against rotation through the intermeshing teeth engagement with the force transmission member. The teeth automatically prevent relative rotation between the two components without requiring external securing mechanisms, simplifying the overall setup.
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 modular design simplifies setup, reduces manufacturing costs, and minimizes axial length, resulting in a more compact and efficient linear unit for motor vehicle brake systems.
Implementation Method 1
the rotational/translational gear, which has a threaded spindle and a threaded nut
Implementation Method 2
a spring element, which acts in the axial direction and which is supported axially on the piston 4
Data Source
AI summary
A linear unit for applying an axially acting force, composed of a rotational/translational gear (2) which has a threaded spindle (18) and a threaded nut (19) which are arranged in a gear housing (22), and of an electric motor (1) with a rotor (12) and with a stator (11) which are arranged in an electric motor housing (10). In order to simplify the set-up of the linear unit, while at the same time reducing the packaging space required, according to the invention the threaded spindle (18) is mounted rotatably and axially fixedly inside the gear housing (22) and is connected to the rotor (12) outside the gear housing (22).