Electromechanical Vehicle Brake Threaded Nut Pocket Recess
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Solution Overview
Problem
The production of ball screws for combined vehicle brakes and purely electromechanical actuation systems is complicated due to the need for precise drilling of stops into the threaded nut, which limits mobility and increases production difficulties.
Innovation Solution
Integrating pocket-shaped recesses within the threaded nut as stops for spring elements, allowing rolling elements to slip in an unloaded state and roll under load, eliminating the need for additional components and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stops are inserted into the threaded nut from outside via drilling, then the rolling elements can be constrained, but production becomes difficult due to the need for precise drilling that meets the thread convolution
Solution Approach 1:
The stop and the threaded nut are merged into a single integrated component. The pocket-shaped recess is directly formed in the threaded nut body, eliminating the need for separate stop components and complex drilling operations. This integration allows the stop to be produced simultaneously with the threaded nut in one manufacturing process, significantly reducing production difficulty while maintaining precise positioning of the rolling elements.
2Reliability
If additional components are used for stops, then the rolling elements can be properly constrained, but the device complexity increases
Solution Approach 1:
The stop function is integrated directly into the threaded nut structure through the pocket-shaped recess, eliminating the need for separate stop components. This merging reduces the total number of parts while maintaining reliable constraint of the rolling elements, as the recess is precisely formed as part of the threaded nut's geometry.
3Ease of operation
If the rolling elements are allowed to slip in unloaded state, then adjustment is possible, but energy is lost during slipping motion
Solution Approach 1:
The system dynamically transitions between slipping and rolling states based on load conditions. In the unloaded state, the rolling elements slip to allow easy adjustment and positioning of the brake piston. When load is applied, the spring element pushes the rolling elements into rolling motion, minimizing energy loss during normal operation. This dynamic behavior optimizes both adjustability and energy efficiency.
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 enhances production efficiency, reduces costs by eliminating the need for separate stop components, and maintains high efficiency with rolling elements achieving 85% to 95% efficiency while allowing for adjustment and actuation without additional devices.
Implementation Method 1
a spring element which allows the rolling elements to slip when the gear unit is actuated in an unloaded state while causing the rolling elements to roll when the gear unit is actuated under load
Implementation Method 2
the gear unit converts the rotary motion of an electromechanical actuator into a translational motion, causing the brake piston to be actuated
Data Source
AI summary
A combined electromechanical vehicle brake has a hydraulically activated operating brake and an electromechanically activated parking brake apparatus. A hydraulic operating pressure chamber in a brake housing is delimited by a brake piston that can be loaded by hydraulic pressure to carry out operating braking actions. The brake piston can be activated along a longitudinal piston axis to achieve a braking effect. The parking brake apparatus acts upon the brake piston by a gear unit because the gear unit converts the rotational movement of an electromechanical actuator into a translational movement, causing the brake piston to be activated to carry out parking brake processes and remain in the activated position. The gear unit has a threaded spindle and a threaded nut that contact one another via a plurality of rolling elements. A spring element allows the rolling elements to slip when the gear unit is activated in the unloaded state.