Vehicle Door Handle Assembly With 3-Axis Tolerance Compensation
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Solution Overview
Problem
The existing assembly process for vehicle door outside handle units is cumbersome due to the need for separate steps and tolerance compensation in multiple directions, which increases assembly time and complexity.
Innovation Solution
The solution involves forming alignment projections on the carrier part and using compensating elements with hollow-cylindrical basic elements and fixing sleeves in threaded engagement, allowing for simultaneous fixation and tolerance compensation in all three axes during a single operation from the inside of the door, with the help of a fixing plate and internal threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outside handle unit is assembled in two separate steps (carrier part first, then handle bar), then the mounting positions can be prepared in advance, but the assembly time increases due to the need for separate tolerance compensation operations
Solution Approach 1:
The patent combines the mounting of the carrier part and handle bar into a single integrated assembly operation. The carrier part is mounted on the door shell from the inside, and the handle bar is simultaneously mounted from the outside through the opening, with both components being fixed in one continuous process rather than separate steps.
Solution Approach 2:
The opening in the door shell acts as an intermediary element that allows the handle bar to be mounted from the outside while the carrier part is fixed from the inside. This intermediary structure enables simultaneous access and fixation of both components without requiring disassembly or complex coordination.
2Manufacturing precision
If tolerance compensation is performed in all three directions (X, Y, Z), then precise alignment is achieved, but the assembly process becomes more complex requiring multiple adjustment operations
Solution Approach 1:
The carrier part is pre-mounted on the door shell from the inside before the handle bar is attached. This preliminary positioning establishes the reference framework for subsequent alignment operations, allowing tolerance compensation to be performed more efficiently during the single integrated assembly step.
Solution Approach 2:
The patent performs tolerance compensation in all three spatial dimensions (X, Y, Z directions) simultaneously during the assembly process. The mounting structure allows adjustment along the longitudinal axis (X), transverse axis (Y), and vertical axis (Z), enabling comprehensive alignment precision without requiring multiple separate adjustment operations.
3Shape
If the handle bar is mounted with a small circumferential gap in the opening, then the aesthetic appearance is improved, but even small gap deviations become noticeable requiring higher precision
Solution Approach 1:
The carrier part is pre-positioned and fixed to the door shell from the inside before the handle bar is mounted. This preliminary action establishes a stable reference structure that ensures the opening maintains consistent dimensions and positioning, thereby ensuring uniform circumferential gaps when the handle bar is installed.
Solution Approach 2:
The single integrated assembly process allows for real-time adjustment and verification of gap uniformity. The mounting structure enables tolerance compensation that can be adjusted based on observed gap deviations, ensuring aesthetic appearance while maintaining manufacturing feasibility.
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 method simplifies the assembly of the outside handle unit by enabling one-step fixation and tolerance compensation in the X, Y, and Z directions, reducing assembly time and complexity while ensuring precise alignment and flush mounting of the handle bar.
Implementation Method 1
a spring element, so that turning the fixing screw causes the fixing sleeve to move against the fixing plate and further turning the fixing screw presses a screw head on the back against the carrier part to fix it
Data Source
Figure 1~2
Figure 3
AI summary
A motor vehicle door with an external handle unit (10) comprising a support part (14) and a handle bracket (12) has several compensating elements (16) on the circumference of a support part (14) and a fixing plate (20) with several fixing points on the inside of the door shell (18), wherein the compensating elements (16) are designed to allow both a compensating movement in the Y direction by means of a screw-in fixing screw and a compensating movement in the X and Z directions by means of a floating bearing.