Thin Cycloidal Speed Reducer With Hollow Input Member
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Solution Overview
Problem
Existing cycloidal speed reducers face challenges in achieving high reduction ratios, durability, and quiet operation, while also being compact and cost-effective, due to limitations in tooth profile design and manufacturing complexity.
Innovation Solution
A thin cycloidal speed reducer design featuring a cylindrical input member with eccentric external gears and an internal gear system, along with a manufacturing method that includes specific steps for assembling the components to ensure efficient and stable production, reducing the number of roller pins required and allowing for a lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cycloidal speed reducer design is used, then basic speed reduction function is achieved, but the structure is bulky and durability is insufficient
Solution Approach 1:
The input member is divided into multiple independent insertion holes (first insertion hole, second insertion hole, etc.) instead of a single solid structure. This segmentation allows the input member to be thinner while maintaining structural integrity through the distributed hole configuration, directly resolving the contradiction between durability and structure thickness.
Solution Approach 2:
The design nests multiple functional components within the input member structure - the insertion holes are integrated into the input member body, and the external gears are positioned around these holes. This nesting allows the structure to be compact and thin while maintaining all necessary functional elements for durability and operation.
2Manufacturing precision
If new tooth profile design technologies are used, then higher reduction ratio and precision are achieved, but durability decreases and service life shortens
Solution Approach 1:
The invention uses standard cycloidal tooth profiles rather than experimental new profiles, maintaining proven durability characteristics. The precision is achieved not through novel tooth geometry but through precise manufacturing of the eccentric rotation mechanism and proper selection of geometric parameters (hole positions, gear tooth counts), thus avoiding the durability issues associated with unproven tooth profile designs.
3Ease of manufacture
If conventional manufacturing methods are used, then basic assembly is achieved, but production complexity and cost are high
Solution Approach 1:
The input member is segmented with multiple insertion holes that can be manufactured independently using standard drilling and machining operations. This segmentation simplifies the manufacturing process compared to creating complex solid structures, as each hole can be produced separately and assembled, reducing both production complexity and cost.
4Strength
If solid input member structure is used, then structural strength is maintained, but the overall device thickness increases
Solution Approach 1:
The input member transitions from a solid structure to a segmented structure with multiple insertion holes. The strength is maintained not through solid material continuity but through the distributed configuration of holes and the surrounding material framework, allowing the member to be thinner while preserving structural integrity through the segmented design.
Solution Approach 2:
The input member effectively becomes a composite structure combining solid material regions with hollow regions (insertion holes). This composite approach allows the thin structure to maintain strength by strategically placing material where it provides maximum structural benefit while removing material that would increase thickness, creating an optimized strength-to-thickness ratio.
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 enables a thin, efficient, and durable cycloidal speed reducer with improved reduction ratios and reduced noise, achieved through a compact design and simplified manufacturing process, resulting in lower production costs and enhanced performance.
Implementation Method 1
a first external gear having a first hollow portion adapted to insert a first area formed on the outer peripheral surface of the input member; a second external gear having a second hollow portion adapted to insert a second area formed on the outer peripheral surface of the input member
Implementation Method 2
a lower housing having an internal gear formed on the inner peripheral surface thereof with the tooth profile corresponding to the tooth profile of the outer peripheral surfaces of the first external gear and the second external gear
Data Source
AI summary
The present invention relates to a cycloidal speed reducer and a manufacturing method thereof, and more particularly, to a thin cycloidal speed reducer and a manufacturing method thereof that are capable of achieving a thin structure through an input member with a hollow portion.