Encoder Oil Mist Prevention Structure
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Solution Overview
Problem
Optical encoders are sensitive to oil mist and dust contamination from oil-containing bearings, leading to inferior or erroneous signals and mechanical instability due to external forces.
Innovation Solution
An oil mist prevention structure with a mask and ring design that blocks splashing lubricant and enhances axial load resistance, ensuring the encoder's components remain clean and stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If oil-containing bearings are used to enhance smoothness and stability of the rotary disk, then rotational stability is improved, but oil mist and vapor contaminate the rotary disk and secondary encoding piece, degrading signal quality
Solution Approach 1:
The patent divides the encoder structure into separate functional zones: a contamination-prone bearing area and a clean sensing area. The rotary disk with light/dark patterns and secondary encoding piece are spatially separated from the oil-containing bearings, creating distinct functional regions that prevent cross-contamination while maintaining各自 functionality
Solution Approach 2:
The patent introduces an intermediary protective structure (the specific structural arrangement of the rotary disk and encoding pieces relative to bearings) that mediates between the oil-containing bearings and the optical sensing components, preventing direct contact between oil mist and the optical path while allowing the bearings to continue providing rotational support
2Ease of manufacture
If adhesive bonding is used to fix the shaft to the bearing, then assembly simplicity is improved, but the shaft generates displacement under external axial force, damaging the encoder
Solution Approach 1:
The patent pre-establishes a mechanical interference fit structure between the shaft and bearing before operation. The shaft is designed with dimensions that create interfering cooperation with the bearing, providing built-in mechanical protection against axial displacement before any external forces are applied, eliminating the need for additional protective measures
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
The solution effectively prevents contamination of the rotary disk and secondary encoding piece, prolongs the lifespan of the oil-containing bearings, and enhances the encoder's resistance to axial loads and external forces, maintaining signal stability and accuracy.
Implementation Method 1
by emitting parallel light beams passing through light and dark gratings on a glass disk to generate 0 and 1 signals
Implementation Method 2
Through detecting the signal variation generated by the light acceptor 52a, the positional information can be obtained
Implementation Method 3
the use of oil-containing bearing 20a will heat the lubricant to be vaporized into oil mist
Implementation Method 4
heat the lubricant to be vaporized into oil mist, which will contaminate the rotary disk 40a and the secondary encoding piece 13a
Data Source
AI summary
An encoder having an oil mist prevention structure includes: an encoding body including a cylindrical base, a light emitter and a secondary encoding piece; an oil-containing bearing received and fixed in the cylindrical base; a shaft penetrating the oil-containing bearing to protrude beyond an end surface of the bearing; a rotary disk fixed onto the shaft to cover one side of the secondary encoding piece; a light acceptor fixed to the cylindrical base to correspond to the light emitter and the secondary encoding piece, thereby receiving the signals emitted by the light emitter; and an oil mist prevention structure including a mask integrally formed with the shaft and exposed beyond an end surface of the bearing and a ring extending from the mask for covering an outer periphery of the bearing.