Circular Rack and Pinion Assembly with Absolute Distance Adjustment
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Solution Overview
Problem
Existing power transmission apparatuses face challenges in precisely measuring and maintaining the absolute assembly distance between a circular rack and a pair of upper pinions, leading to difficulties in assembly, reliability, and maintenance.
Innovation Solution
A power transmission apparatus is designed with a pinion assembly distance adjuster that measures and fixes the absolute assembly distance between the circular rack and the upper pinions, improving assembly convenience, reliability, and ease of maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If relative assembly distance measurement is used, then assembly work can be performed with available measuring instruments, but absolute assembly distance cannot be determined and instrument re-setting is required
Solution Approach 1:
A gauge block is introduced as an intermediary standard object with a known precise length. The measuring instrument is calibrated against this gauge block to establish an absolute reference point, enabling accurate measurement of the absolute assembly distance between the circular rack and pinions without requiring complex instrumentation or repeated setup procedures.
2Ease of operation
If assembly distance is not precisely controlled, then assembly process becomes simpler, but assembly reliability and positioning accuracy deteriorate
Solution Approach 1:
The gauge block is prepared in advance with a precisely known length that corresponds to the required absolute assembly distance. During assembly, this pre-prepared standard is used to directly set and verify the correct positioning of components, eliminating the need for complex real-time calculations or adjustments while ensuring high assembly reliability and positioning accuracy.
3Measurement precision
If complex measurement procedures are used, then absolute assembly distance can be measured, but measurement time and process complexity increase
Solution Approach 1:
The gauge block serves as a self-contained measurement standard that carries its own precise length information. By using this self-service standard, the measurement process becomes straightforward and rapid, as the gauge block itself provides the reference without requiring complex calibration procedures, multiple instruments, or extensive setup time, thus reducing measurement time while maintaining high precision.
Data Source
AI summary
A power transmission apparatus and a manufacturing method thereof are disclosed. A power transmission apparatus according to an embodiment of the inventive concept includes: a circular rack to which a motor generating power is connected to form an input shaft; a pair of upper pinions gear-engaged with both sides of the circular rack, configured to adjust an assembly distance from the circular rack through a predetermined pinion assembly distance adjuster, and decelerating power received from the circular rack by a reduction ratio of a built-in deceleration structure and transferring decelerated power; a pair of lower pinions respectively one-to-one connected to the pair of upper pinions, and decelerating the power received from the upper pinion by a reduction ratio of a built-in deceleration structure and transferring decelerated power; and a rack/pinion fixing plate to which the circular rack is fixed and to which the pair of upper pinions and the pair of lower pinions are assembled to be movable and fixed.