Rotation Transmission Device Backlash Reduction
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Solution Overview
Problem
Helical gears are expensive and time-consuming to manufacture due to the need for complex metal molds, and they are not cost-effective for reducing backlash in rotation transmission devices.
Innovation Solution
A rotation transmission device using inexpensive spur gears with a linking part supported by an inclinable and rotatable supporting part, featuring an urging mechanism to press the gears together, reducing backlash and enhancing operability while minimizing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If helical gears are used to reduce backlash, then the backlash between gears is reduced, but the manufacturing cost increases due to expensive metal molds and prolonged shot cycles
Solution Approach 1:
The patent replaces expensive helical gears with inexpensive spur gears. Although spur gears traditionally have backlash, the invention compensates through the urging mechanism that presses the gears together, eliminating the need for costly helical gear manufacturing while achieving similar backlash reduction
Solution Approach 2:
The patent changes the operational parameters of spur gears by introducing an urging mechanism that applies continuous pressing force. This parameter change (from zero pressing force to continuous pressing force) transforms the performance of simple spur gears to match or exceed that of complex helical gears, achieving backlash reduction without increasing manufacturing cost
2Manufacturing precision
If helical gears are used to reduce backlash, then the backlash between gears is reduced, but the manufacturing time increases due to complex mold operations
Solution Approach 1:
The patent substitutes complex helical gears with simple spur gears that can be manufactured quickly using inexpensive molds. The urging mechanism compensates for the traditional disadvantages of spur gears, enabling fast production without sacrificing backlash performance
3Ease of manufacture
If spur gears are used instead of helical gears, then manufacturing cost is reduced, but backlash increases
Solution Approach 1:
The patent introduces an urging mechanism as an intermediary element between the spur gears. This mechanism mediates the interaction between gears by applying continuous pressing force, thereby eliminating the backlash that would otherwise be present in simple spur gear systems while maintaining the cost advantages of using spur gears
4Reliability
If multiple separate parts are used for the supporting structure, then the gears can be properly positioned and urged, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the supporting structure and urging mechanism into an integrated single component. This consolidation maintains the functional requirements of positioning and urging the gears while reducing the number of separate parts, thereby simplifying the device structure and reducing manufacturing cost without compromising gear engagement stability
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 reduces backlash and enhances operability using spur gears, achieving stable gear engagement and cost savings by simplifying the manufacturing process and reducing the number of parts.
Implementation Method 1
an urging part configured to urge the linking part so that the third gear is pressed to the first gear and the fourth gear is pressed to the second gear
Implementation Method 2
The inner circumferential surface of the accommodating part of the present invention is spaced from the linking part. In this structure, since there is a space between the linking part and the inner circumferential surface of the accommodating part, no frictional force is generated between them
Data Source
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AI summary
A rotation transmission part (40) is urged by urging parts (30e1, 30e2, 30e3) toward a rotation reference line (02) on a Z1 side with respect to engaging parts (63c) while the engaging parts (63c) of the rotation transmission part (40) are supported by the supporting parts (30b) of the supporting body (30). Therefore, the rotation transmission part (40) can be inclined. The third spur gear (61) and first spur gear (20a) engage each other under a certain pressing force, and the fourth spur gear (71) and second spur gear (83) engage each other under the certain pressing force, so backlash is suppressed during the transmission of rotation.