Mandrel-Assembled Gear Involute Artifact for Long Rolled Length
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Solution Overview
Problem
Current large gear involute artifacts fail to meet Class-1 and Class-2 accuracy standards for rolled length and weight, with existing designs being cumbersome and lacking in portability, especially for gears with tip diameters greater than 500 mm.
Innovation Solution
A lightweight large gear involute artifact assembled with a mandrel, comprising a stripe, backing plate, counterweight shaft, adjustable counterweight ring, and eccentric multi-ball bearing, which ensures rigidity, stability, and adjustable center of mass for precise machining and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large gear involute artifacts are designed according to international standard ISO1328-1:2013(E) as integrated gear involute artifact, gear helix artifact and gear pitch artifact, then the artifact can serve multiple functions, but the rolled length of such large gear artifacts is short relative to diameter parameter and cannot meet the basic requirements of rolled length of gear involute artifact according to national standard GB/T 6467-2010 in China
Solution Approach 1:
The artifact is divided into multiple independent components: a sector base piece with base circle center, an involute artifact piece with long rolled length, and a mandrel. This segmentation allows each component to be optimized independently - the involute artifact piece can achieve the required rolled length of not less than 1/4 of the base circle diameter while the sector base piece provides the base circle center for positioning.
2Measurement precision
If large gear involute artifacts are designed with large tip diameter greater than 500 mm to meet measurement requirements, then the measurement capability is improved, but the weight increases to between 0.5 t and 2 t which makes them inconvenient to convey
Solution Approach 1:
The artifact is segmented into multiple components that can be assembled and disassembled. The involute artifact piece is mounted on a mandrel via a sector base piece, allowing the heavy artifact to be broken down into lighter components for convenient transportation and handling while maintaining measurement capability when assembled.
Solution Approach 2:
The artifact adopts a dynamic assembly structure where the involute artifact piece can be mounted and dismounted from the mandrel. This dynamic configuration allows the artifact to be transported in disassembled state (reducing effective weight for transport) and assembled for measurement operations (providing full measurement capability).
3Manufacturing precision
If the rolled length of involute is increased to meet national standard GB/T 6467-2010 requirements, then the measurement accuracy is improved, but the artifact size and weight increase making it less portable
Solution Approach 1:
The artifact with long rolled length is segmented into an involute artifact piece mounted on a mandrel. This allows the involute artifact piece to achieve the required rolled length of not less than 1/4 of the base circle diameter while being mounted on a removable mandrel, enabling portability through disassembly into lighter components.
4Measurement precision
If large gear involute artifacts are designed with direct base circle center for precise positioning, then the positioning accuracy is improved, but the structural complexity increases
Solution Approach 1:
The base circle center is provided by the sector base piece as a separate component from the involute artifact piece. This segmentation allows the base circle center to be precisely established on the mandrel while the involute artifact piece is mounted separately, maintaining positioning accuracy without requiring complex integrated structure.
Data Source
AI summary
A large gear involute artifact assembled with mandrel used as physical datum of precision traceability and measurement transmission for large gear involute is proposed. The artifact comprises a large gear involute artifact stripe, a mandrel, a backing plate, a counterweight shaft, an adjustable counterweight ring, the adjustable screws of counterweight, the connecting screws for backing plate, the connecting screws for artifact and an eccentric multi-ball bearing. The structure and the rolled length of the large gear involute artifact assembled with mandrel fit the basic requirements of class-1 accuracy in the national standard of gear involute artifact GB/T 6467-2010 in China. It has advantages of long rolled length, adjustable center of mass, uniform datum, compact structure, and portability. It adopts lightweight design, which can be installed and transported by one person manually, and is suitable for the structural design of large gear involute artifact with base-circle diameter greater than 500 mm.