Spindle Nut Self-Aligning Assembly for Electric Parking Brake
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Solution Overview
Problem
The assembly complexity of spindle nut assemblies in electric parking brake actuators is increased due to the need for pre-positioning the spindle nut during assembly, which complicates the process.
Innovation Solution
A spindle nut assembly design that eliminates the need for pre-positioning by using a conical portion on the spindle nut that engages a complementary conical inner portion of the piston, along with stop cams and spindle stops, allowing the spindle nut to self-align and engage without initial positioning, simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle nut has multiple threads and requires pre-positioning during assembly, then the spindle nut stop can engage the spindle stop before the spindle nut jams against the spindle, but the assembly complexity increases
Solution Approach 1:
The spindle nut is designed with a conical portion that automatically aligns with the complementary conical inner portion of the piston during assembly. This self-aligning mechanism eliminates the need for manual pre-positioning of the spindle nut, allowing the stop cam to engage the stop surface automatically as the spindle nut threads onto the spindle, thus resolving the contradiction between reliable engagement and assembly simplicity
Solution Approach 2:
The conical portions on the spindle nut and piston create a curved, self-guiding interface that directs the spindle nut into proper alignment during insertion. This geometric feature ensures automatic positioning without requiring precise manual placement, enabling the stop engagement to occur naturally during the threading process while maintaining assembly reliability
Data Source
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AI summary
A spindle nut assembly for an electric parking brake has a spindle and a spindle nut. The spindle has a plurality of spindle stops and a plurality of external threads. The plurality of external threads has at least two threads. The spindle nut is operatively connected to the spindle, has a plurality of stop cams, and has a plurality of internal threads. At least one of the plurality of stop cams is engaged with at least one of the plurality of spindle stops when a first thread of the plurality of internal threads is started on any external thread of the plurality of external threads.