Hypoid Gear Meshing Position Adjustment via Transmission Error Integration
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Solution Overview
Problem
Existing methods for adjusting the meshing position of hypoid gears are inadequate as they fail to accurately identify the minimum transmission error without assembly and are prone to large errors due to positional displacement under torque, leading to gear noise issues.
Innovation Solution
A method involving repeated displacement of the second gear while in mesh with the first gear, measuring transmission errors, plotting relationships, evaluating hypothetical errors, and integrating differences to determine a meshing position that considers both measured and hypothetical errors, reducing gear noise by establishing a more appropriate meshing position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second gear is assembled at positions where transmission error is measured to identify the minimum transmission error position, then gear noise can be reduced, but the accurate meshing position cannot be identified unless the second gear is assembled at the truly minimum transmission error position
Solution Approach 1:
The patent applies preliminary action by measuring transmission errors at multiple predetermined positions before final assembly, and using hypothetical transmission error evaluation to predict the optimal meshing position without requiring trial assembly at the exact minimum error position. This allows the meshing position to be determined in advance with high precision while avoiding the complexity of iterative assembly adjustments.
2Reliability
If the hypoid gear is installed on an automotive body and torque is imposed, then the first gear and second gear may be positionally displaced relatively due to rigidity shortage of the gear case, but this results in a large transmission error
Solution Approach 1:
The patent applies preliminary anti-action by establishing a meshing position that anticipates and compensates for the positional displacement that will occur under torque load. The hypothetical transmission error evaluation considers the rigidity shortage of the gear case and predicts the displacement, allowing the meshing position to be pre-adjusted to maintain accuracy even after load-induced displacement occurs.
3Measurement precision
If multiple transmission error measurements are taken at different positions and hypothetical transmission errors are evaluated, then a more appropriate meshing position can be established, but this increases the complexity of the adjustment process
Solution Approach 1:
The patent applies parameter changes by systematically varying the meshing position parameters (displacement distances along the rotational shaft direction) and evaluating transmission errors at each parameter setting. By changing parameters in a structured manner and using hypothetical error evaluation, the method achieves high precision in determining the optimal meshing position while keeping the adjustment process manageable through systematic parameter exploration.
Data Source
AI summary
A method for adjusting the meshing position of a hypoid gear having a first gear, and a second gear meshing with the first gear and transmitting the rotary motion thereof in the direction different from the extending direction of the axis of rotation of the first gear. The method for adjusting the meshing position comprises; a) a step for displacing the second gear a plurality of times along the axial direction of rotation while meshing with the first gear, b) a step for measuring the transmission error at each displacement position and plotting the relation of the displacement distance of the second gear and the measured transmission error, c) a step for evaluating the virtual transmission error between the measured transmission errors from the measured transmission error, d) a step for subtracting the measured transmission error and the virtual transmission error from a maximum allowable transmission error to determine the difference, e) a step for determining the area of a part surrounded by the difference and the maximum allowable transmission error by integrating the difference with the displacement distance of the second gear, and f) a step for dividing the part at a predetermined area ratio and setting a point where the division line intersects the displacement distance of the second gear at the meshing position of the second gear.