Brake Actuator Drive Unit End-Plate Support for Planet Carrier Alignment
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Solution Overview
Problem
Existing drive units for electrified brake system actuators require complex assembly processes, leading to increased production costs and potential misalignment issues due to multiple connection points, which can introduce lateral forces and compromise the stability of the planetary transmission.
Innovation Solution
The drive unit incorporates an end plate mounted on the motor housing to support the planet carrier, allowing for preassembly of the electrical machine and planetary transmission, utilizing rolling element bearings for low-friction mounting and dowel screws for precise alignment, reducing assembly complexity and costs while ensuring stable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the planetary transmission is connected to the electrical machine as part of the final assembly, then the installation space is utilized, but the assembly process becomes complex and production costs increase
Solution Approach 1:
The drive unit is divided into modular components: the electrical machine, the planetary transmission, and the end plate assembly. These modules can be manufactured separately and then assembled together, simplifying the overall assembly process and reducing production complexity while maintaining compact installation space.
2Reliability
If multiple connection points are used to attach the planetary transmission, then the mechanical connection is secure, but misalignment issues occur and lateral forces are introduced
Solution Approach 1:
The end plate serves as an intermediary component between the electrical machine and the planetary transmission. It provides a single, precisely positioned mounting surface that securely attaches the planet carrier to the motor housing, eliminating misalignment issues and lateral forces that would result from multiple connection points.
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 simplifies assembly, reduces production costs, and minimizes lateral forces, achieving precise alignment and robust mechanical fastening, thereby enhancing the stability and efficiency of the brake system actuator.
Implementation Method 1
the end plate carries a rolling element bearing for mounting the planet carrier. As a result, a low-friction mounting of the planet carrier is achieved
Implementation Method 2
the end plate is pressed into the motor housing and thus fastened to the motor housing by way of an interference fit
Data Source
AI summary
A drive unit for an actuating device of a brake system. The drive unit includes: a motor housing; an electrical machine arranged in the motor housing, wherein a rotor of the electrical machine is arranged for conjoint rotation on a motor shaft mounted rotatably in the motor housing; and a planetary transmission by way of which the motor shaft is connected or connectable to an actuator element of the actuating device, wherein the planetary transmission has a rotatably mounted planet carrier, and wherein the planet carrier has a carrier portion on which at least one planet gear is rotatably mounted. The drive unit has an end plate arranged on the motor housing, by way of which end plate the planet carrier is mounted on a side of the planet gear facing away from the electrical machine.