Rotary-Linear Torque Transmission Tooth Profile for Bearing Clearance
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Solution Overview
Problem
Conventional rotary to linear torque transmission devices face precision issues due to radial clearance in bearings, leading to interference between rollers and teeth, which are not accounted for in existing mathematical models, resulting in accuracy errors.
Innovation Solution
The solution involves modifying the tooth profile by incorporating a clearance compensation based on the diametrical difference between the roller diameter and the inscribed diameter of the bearing elements, which is calculated and applied to the parametric equations governing the tooth profile to prevent interference and enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional tooth profiles are used without clearance compensation, then the device structure is simple, but interference occurs between rollers and teeth due to bearing radial clearance, reducing transmission precision
Solution Approach 1:
The invention applies preliminary action by pre-calculating and incorporating clearance compensation values into the tooth profile design before manufacturing. The clearance compensation is determined based on the diametrical difference between roller diameter and inscribed diameter of bearing elements, and this compensation is built into the parametric equations governing the tooth profile. This preliminary adjustment prevents interference between rollers and teeth from occurring during operation, thereby improving transmission precision without adding complex active compensation mechanisms.
2Measurement precision
If bearing radial clearance is not compensated for, then the device is easier to manufacture, but positional error increases due to interference between rollers and teeth
Solution Approach 1:
The invention applies parameter changes by modifying the tooth profile parameters through incorporation of clearance compensation values. The parametric equations governing the tooth profile are adjusted to include the diametrical difference between roller diameter and inscribed diameter of bearing elements. This parameter modification allows the tooth profile to accommodate bearing radial clearance, thereby eliminating interference and improving positional accuracy while maintaining standard manufacturing processes.
Data Source
AI summary
A torque transmission device has a pinion that includes a plurality of rollers that mesh with a plurality of teeth of an output. Each roller is supported by a bearing having rotating bearing elements. A clearance compensation for the diametrical difference between a diameter of each roller and an inscribed diameter of the associated rotating bearing elements is included in the plurality of teeth of the output such that there is no interference between the plurality of rollers and the plurality of teeth.