Torque Pin Eccentric Gear Backlash Reduction
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Solution Overview
Problem
The existing eccentric oscillating-type gear transmission experiences backlash due to the clearance required by ring members functioning as sliding bearings, which increases friction and reduces efficiency.
Innovation Solution
The gear transmission design eliminates the need for ring members by using a torque pin that freely fits into both a fitting hole in the carrier and a through hole in the external gear, allowing the torque pin to function as a rolling bearing, thereby reducing clearance and backlash without increasing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ring members are used as sliding bearings between the carrier and external gear, then friction is reduced, but clearance increases causing backlash
Solution Approach 1:
The patent replaces the sliding bearing mechanism (ring members) with a rolling bearing mechanism (torque pins that roll within fitting holes). This substitution transforms the friction type from sliding friction to rolling friction, achieving lower friction loss while requiring minimal clearance, thereby eliminating backlash without energy penalty.
Solution Approach 2:
The patent changes the contact mechanism parameter from sliding contact to rolling contact. By designing torque pins that rotate and roll within the fitting holes of the carrier while maintaining eccentric rotation, the system achieves both low friction and minimal clearance requirements, resolving the contradiction between friction reduction and backlash elimination.
2Force
If clearance is increased to allow ring members to function as sliding bearings, then friction is reduced, but backlash increases
Solution Approach 1:
The patent substitutes the sliding bearing system with a rolling bearing system using torque pins. The torque pins roll within the fitting holes during eccentric rotation, generating rolling friction that is significantly lower than sliding friction, while the rolling mechanism requires minimal clearance, thus eliminating backlash.
Solution Approach 2:
The patent introduces dynamic rolling motion of the torque pins within the fitting holes. As the external gear eccentrically rotates, the torque pins dynamically roll along the inner circumference of the fitting holes, transforming static sliding contact into dynamic rolling contact, which reduces friction while maintaining tight clearance.
3Manufacturing precision
If ring members are eliminated, then backlash is reduced, but friction may increase
Solution Approach 1:
The patent eliminates ring members entirely and replaces their sliding bearing function with torque pins that roll within fitting holes. This substitution achieves both backlash elimination (by removing the clearance required for sliding bearings) and friction reduction (by using rolling contact instead of sliding contact).
Solution Approach 2:
The patent extracts and removes the ring members from the system, eliminating the source of backlash. The essential bearing function is then fulfilled by the torque pins rolling in the fitting holes, which provide both the necessary support and the low-friction rolling contact without requiring the clearance that caused backlash.
4Manufacturing precision
If torque pins are used instead of ring members, then clearance is reduced, but device complexity increases
Solution Approach 1:
The torque pin serves multiple functions simultaneously: it acts as a bearing element (replacing the ring member's support function), a rolling element (providing low-friction motion), and a torque transmission element (transmitting force from the external gear to the carrier). This multi-functionality eliminates the need for separate ring members, reducing backlash while maintaining structural simplicity.
Solution Approach 2:
The patent merges the bearing function, rolling motion function, and torque transmission function into a single torque pin component. This consolidation eliminates the separate ring member and reduces the number of parts, achieving backlash elimination without significantly increasing device complexity.
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 design effectively reduces backlash and maintains low friction between the carrier and external gear, enhancing the gear transmission's efficiency and torque transmission capabilities.
Implementation Method 1
the torque pin functions as the equivalent of a rolling bearing relative to the carrier, and also functions as the equivalent of a rolling bearing relative to the external gear
Data Source
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AI summary
A technique is taught that reduces the backlash of a gear transmission. A gear transmission 100 comprises an internal gear 42, a carrier 2, an external gear 12 and torque pins 22. The carrier 2 is coaxially supported on the internal gear 42. Fitting holes 14 extending alongside an axis 32 of the internal gear 42 are formed in the carrier 2. The external gear 12 is supported on the carrier 2 so that it can eccentrically rotate, and eccentrically rotates while meshing with the internal gear 42. Through holes 24 are formed in the external gear 12. The torque pins 22 freely fit into both the fitting holes 14 and the through holes 24.