Double Helical Gear Assembly Using a Meshing Guide Groove
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Solution Overview
Problem
Conventional gear devices with double helical gears face challenges in assembly due to space constraints, particularly when securing bolts are not applicable, as the first double helical gear has a small diameter, limiting the assembly of a two-step gear with double helical gears.
Innovation Solution
A gear device design featuring a first double helical gear secured to a motor rotation shaft, a two-step gear with a second double helical gear and a first spur gear, and a second spur gear, where an intermediate shaft is fitted to a shaft hole and guided by a meshing guide groove to facilitate easy assembly by smoothly meshing the gears along a pitch circle, ensuring proper alignment and secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If double helical gears are used to reduce operating noise, then noise reduction is achieved, but thrust force increases and requires more complex assembly
Solution Approach 1:
The first double helical gear is divided into two separate helical gears (first helical gear and second helical gear) along the tooth width direction. These segmented gears can be assembled independently onto the rotation shaft, reducing assembly complexity while maintaining the noise reduction benefits of double helical gear configuration.
Solution Approach 2:
A pressing member is introduced as an intermediary component to press the first helical gear and second helical gear against the rotation shaft. This mediator enables secure fixation of the segmented gears without requiring complex securing mechanisms, simplifying the overall assembly process while handling the thrust force generated by double helical gear meshing.
2Ease of manufacture
If the first double helical gear is divided into two helical gears for easier assembly, then assembly becomes feasible, but the gear requires additional securing components
Solution Approach 1:
The first helical gear and second helical gear are merged together through the pressing member that presses both gears against the rotation shaft. This combining approach secures both segmented gears simultaneously, reducing the need for multiple separate securing components and simplifying the overall assembly structure.
Solution Approach 2:
The pressing member serves as an intermediary that provides a unified securing mechanism for both helical gears. Instead of requiring separate securing components for each gear segment, the pressing member consolidates the securing function, reducing component count while maintaining assembly feasibility.
3Volume of moving object
If the first double helical gear has a small diameter to fit space constraints, then space utilization improves, but assembly of securing bolts becomes impossible
Solution Approach 1:
By segmenting the first double helical gear into two smaller helical gears, the invention eliminates the need for large-diameter construction. The segmented gears can be assembled onto the rotation shaft without requiring bolt holes or large mounting surfaces, making assembly feasible even with limited space and small effective diameter.
Solution Approach 2:
The pressing member acts as an intermediary that enables secure fixation of the segmented gears without requiring traditional bolt securing mechanisms. This intermediary approach allows for compact design with small gear diameter while maintaining assembly capability through alternative fixation methods.
Data Source
AI summary
A gear device includes a first double helical gear, a two-step gear, a second spur gear, and an intermediate shaft The two-step gear includes a second double helical gear meshing with the first double helical gear, and a first spur gear on a back surface side of the second double helical gear. The second spur gear meshes with the first spur gear. A housing includes a shaft support hole and a meshing guide groove. The shaft support hole houses one end side of the intermediate shaft. The meshing guide groove meshes the second double helical gear with the first double helical gear by guiding the intermediate shaft along a pitch circle of the second spur gear to a proximity of the shaft support hole while maintaining the first spur gear meshing with the second spur gear. The meshing guide groove rises up at the proximity of the shaft support hole.