Eccentric Oscillation Gear Device Rotation Angle Correction
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Solution Overview
Problem
Existing eccentric oscillation gear devices face challenges in maintaining consistent rotation angle characteristics due to factors like processing errors, temperature changes, and time-dependent changes, which affect the precision of rotation angles and stop positions, particularly in applications like robots and machine tools.
Innovation Solution
The eccentric oscillation gear device incorporates a storage unit that stores information on parameters influencing rotation angle characteristics, including processing errors, temperature-dependent changes, and time-dependent changes, allowing for correction and control of these factors to improve rotational precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotational phase adjusting unit is added to correct torsional rigidity phase, then the phase consistency is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing correction values for torsional rigidity phase in a storage unit before operation. During operation, these pre-calculated correction values are retrieved and applied without real-time calculation, thus maintaining phase consistency while avoiding the complexity of real-time phase adjustment mechanisms.
Solution Approach 2:
The patent replaces a potential mechanical rotational phase adjusting unit with an information-based system. Instead of mechanically adjusting the phase during operation, the system uses stored correction information to compensate for phase variations, substituting mechanical complexity with data storage and retrieval.
2Manufacturing precision
If multiple correction parameters are stored and applied, then the rotation angle characteristics are improved, but the information processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for multiple parameters (torsional rigidity phase, backlash, positioning accuracy) before the gear device operates. During operation, these pre-prepared correction values are simply retrieved and applied based on measured values, avoiding complex real-time calculations while improving rotation angle characteristics.
Solution Approach 2:
The system applies self-service by automatically retrieving and applying correction values from the storage unit based on measured parameters. The correction process is self-executing without requiring complex external control systems, thus improving precision while keeping information processing simple.
3Reliability
If correction values are stored for multiple conditions (temperature, time, processing errors), then the reliability is improved, but the storage requirements increase
Solution Approach 1:
The patent applies local quality by storing correction values specifically for the most critical parameters that affect gear device performance (torsional rigidity phase, backlash, positioning accuracy) under different conditions. Instead of storing all possible parameters, only the locally relevant correction data is stored, improving reliability while optimizing storage requirements.
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 enables improved rotation angle characteristics by allowing for correction of individual differences, cancellation of errors due to temperature changes, and suppression of errors caused by time-dependent changes, enhancing the precision of rotation angles and stop positions in gear devices.
Implementation Method 1
a crank shaft 10 that includes an eccentric portion 10a and rotates by drive force received from an input portion
Data Source
AI summary
Provided is an eccentric oscillation gear device including: a crank shaft having eccentric portions; oscillation gears having insertion holes into which the eccentric portions are inserted; an outer cylinder; and a carrier. The outer cylinder and the carrier concentrically rotate relative to each other by the oscillation of the oscillation gears due to the rotation of the crank shaft. The eccentric oscillation gear device includes a storage unit which stores at least one type of information out of: information on a parameter that originates from a processing error and influences rotation angle characteristics; information on a parameter that changes depending on temperature and influences rotation angle characteristics; and information on a parameter that influences time-dependent change characteristics and influences rotation angle characteristics.