Drive Device Support Ring Snap-In Assembly
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Solution Overview
Problem
Existing drive devices for motorized adjustments in vehicles face challenges in simple assembly and secure positioning of the support ring relative to the electric motor, which can lead to assembly disruptions and require specialized tools.
Innovation Solution
A support ring is positively or non-positively connected to the electric motor housing, featuring axial retaining arms and spacers to maintain the desired distance between the Hall sensor and rotor, allowing for snap-in connection without additional tools and ensuring secure positioning during assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support ring is not connected to the electric motor, then the structure is simpler, but the support ring cannot be held in position during assembly and may fall out of the housing tube
Solution Approach 1:
The support ring is segmented with multiple retaining arms distributed around its circumference, each capable of independent snap-in connection to the electric motor housing. This segmentation allows the support ring to be held securely at multiple points without requiring a complex overall connection structure.
Solution Approach 2:
The retaining arms are designed to automatically snap into the retaining grooves of the electric motor housing without requiring additional fastening components or tools. The support ring self-secures to the motor housing through this snap-in mechanism, eliminating the need for separate fixing operations.
2Reliability
If special connection components are used to secure the support ring, then the positioning is more secure, but the assembly process becomes more complex and requires additional components
Solution Approach 1:
The support ring is designed to integrate directly with the electric motor housing through the snap-in connection of retaining arms to retaining grooves. This merging eliminates the need for separate connection components such as screws, clips, or adhesives, simplifying both manufacturing and assembly while maintaining secure positioning.
Solution Approach 2:
The snap-in connection mechanism allows the support ring to self-secure to the electric motor housing without requiring additional fastening operations or components. The retaining arms automatically engage with the retaining grooves, making the assembly process simple and reliable.
3Measurement precision
If the Hall sensor is placed closer to the rotor, then the magnetic field detection is stronger, but the support ring must be positioned more precisely to avoid disruption
Solution Approach 1:
The support ring is pre-positioned on the electric motor housing through the snap-in connection of retaining arms to retaining grooves before final assembly. This preliminary positioning ensures the Hall sensor is at the correct distance from the rotor, eliminating the need for precise positioning operations during final assembly and allowing closer placement for better detection.
4Productivity
If the support ring is held securely during assembly, then assembly disruptions are prevented, but the structure becomes more complex
Solution Approach 1:
The support ring is divided into segments with retaining arms at different locations around its circumference. This segmentation allows the support ring to be held securely at multiple points during assembly without requiring a complex overall structure, as each retaining arm independently engages with the housing.
Solution Approach 2:
The support ring automatically secures itself to the electric motor housing through the snap-in connection of retaining arms to retaining grooves during the assembly process. This self-securing mechanism prevents assembly disruptions without requiring additional holding components or complex structural features.
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 solution simplifies the assembly process, maintains the support ring's position, and optimizes the detection of the magnetic field by Hall sensors, while also decoupling vibrations to improve acoustic properties.
Implementation Method 1
a sensor device arranged at a certain distance from the electric motor for contactless detection of the rotational movement of the rotor of the electric motor, which has at least one Hall sensor arranged on a carrier board
Data Source
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AI summary
The invention relates to a drive device for the motorized adjustment of a movable component of a motor vehicle, comprising a housing tube in which a rotary electric motor is arranged, the motor having a rotor with a radially magnetized permanent magnet. The device includes a sensor arranged at a specific distance from the electric motor for the non-contact detection of the rotational movement of the electric motor's rotor. This sensor comprises at least one Hall sensor mounted on a carrier board, the carrier board being supported by a support ring that is axially supported against the electric motor and arranged within the housing tube. The support ring is positively and/or frictionally connected to the electric motor.