Electromechanical Brake Actuator With Nested Gear-Spindle Layout
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Solution Overview
Problem
Actuator assemblies for electromechanical vehicle brakes require significant space due to the arrangement of the electric motor and gear mechanisms, which is disadvantageous in confined spaces.
Innovation Solution
The gear mechanism is arranged at least partially inside the spindle nut and/or spindle sleeve, utilizing existing components like the spindle sleeve's internal teeth, reducing the overall installation length and space requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the gear mechanism is arranged outside the spindle nut and spindle sleeve, then the assembly is easier to manufacture and maintain, but the installation length and space requirement increase
Solution Approach 1:
The gear mechanism is nested inside the spindle nut and/or spindle sleeve, with gears arranged within the internal cavity of these components. This nesting approach reduces the overall installation length by utilizing the internal space of existing components rather than adding external gear housings.
Solution Approach 2:
The gear mechanism is merged with the spindle nut and spindle sleeve by integrating the gears directly into these components. The spindle sleeve's internal teeth and the spindle nut's structure are combined with the gear mechanism, eliminating separate gear housings and reducing overall space requirements.
2Volume of stationary object
If the gear mechanism is arranged inside the spindle nut and spindle sleeve, then the space utilization is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The gear teeth are formed with high precision only in the specific regions where meshing is required (internal teeth of spindle sleeve, teeth of spindle nut), while other parts of the components maintain standard manufacturing tolerances. This localized high-precision approach minimizes the overall impact on manufacturing complexity.
Solution Approach 2:
The spindle sleeve and spindle nut serve multiple functions: they provide structural support for the brake actuator, guide the movement of the brake lining, and simultaneously serve as housings for the gear mechanism. This multi-functionality reduces the need for additional dedicated gear housing components.
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 arrangement saves space and optimizes the use of available space within the actuator assembly, allowing for a more compact design while maintaining effective operation.
Implementation Method 1
a spindle drive which has a spindle sleeve, a spindle nut and a drive shaft, driven by an electric motor, for adjusting the spindle nut in an axial direction via the spindle sleeve
Implementation Method 2
The drive shaft is coupled to the spindle sleeve via a gear mechanism, and the gear mechanism is arranged at least partially inside the spindle nut and/or the spindle sleeve in the axial direction
Data Source
AI summary
An actuator assembly for an electromechanical vehicle brake is proposed, having a brake caliper in which an intermediate space for a brake rotor is formed, wherein a brake lining, which can be applied to the brake rotor, is arranged in the intermediate space, a spindle drive which has a spindle sleeve, a spindle nut and a drive shaft, driven by an electric motor, for adjusting the spindle nut in an axial direction via the spindle sleeve, wherein the spindle nut is movable between an extended and a retracted position by axial adjustment and the drive shaft is coupled to the spindle sleeve via a gear mechanism, and wherein the gear mechanism is arranged at least partially inside the spindle nut and/or the spindle sleeve in the axial direction.