Roller Screw Single Nut Bi-Directional Load Design
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Solution Overview
Problem
Existing roller screw designs that aim to handle bi-directional forces require two nuts, increasing length, fabrication complexity, and cost, while simpler designs lack sufficient load-bearing capacity and rigidity.
Innovation Solution
A roller screw with a single nut and multiple circulating devices that connect two sets of helical grooves on the screw and nut, allowing rollers to rotate in different directions and form a single circulation path, enhancing load-bearing capacity and simplifying fabrication and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If one screw cooperates with two nuts to achieve bi-directional load capability, then the load-bearing capacity and rigidity are improved, but the total length of the nuts increases, fabrication complexity increases, and assembly time increases
Solution Approach 1:
The patent merges two separate nuts into a single integrated nut structure that contains two independent circulation paths. This allows the system to achieve bi-directional load capability while reducing the total number of nuts from two to one, thereby simplifying the overall structure, reducing fabrication complexity, and shortening assembly time while maintaining the load-bearing capacity improvement
Solution Approach 2:
The single nut is segmented into two independent circulation paths within its structure. Each circulation path handles load in a different direction, allowing the nut to bear bi-directional forces. This segmentation enables the system to achieve the functionality of two separate nuts while using only one physical nut component
2Strength
If one screw cooperates with two nuts to achieve bi-directional load capability, then the load-bearing capacity and rigidity are improved, but the manufacturing cost increases
Solution Approach 1:
By merging two nuts into one integrated component with two circulation paths, the patent reduces the total number of parts that need to be manufactured, inventoried, and assembled. This consolidation reduces manufacturing cost while maintaining the bi-directional load capability through the segmented circulation paths within the single nut
3Strength
If one screw cooperates with two nuts to achieve bi-directional load capability, then the load-bearing capacity and rigidity are improved, but the installation time increases
Solution Approach 1:
The patent combines two separate nut installations into one single nut installation process. Since the single nut contains both circulation paths internally, it can be installed in one operation rather than requiring two separate installation operations, thereby reducing assembly time while maintaining the bi-directional load capability
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 achieves bi-directional load capability with a simplified structure, reduced fabrication complexity, and lower costs by allowing rollers to rotate in different directions within a single circulation path, improving performance and ease of assembly.
Implementation Method 1
the rollers in the different helical grooves rotate in different directions to bear bi-directional load
Implementation Method 2
the circulation is realized through the two openings at two ends of the circulating device and a passage between the two openings
Data Source
AI summary
A roller screw having plural circulating devices cooperating with plural helical grooves comprises a screw, a nut, plural rollers and circulating devices. The screw is provided in a surface with at least two helical grooves. The nut is provided with helical grooves opposite to the screw and receiving holes in a peripheral wall thereof, and each receiving hole is provided with a fixing groove at each of two ends thereof. The rollers are arranged in the helical grooves of the screw and the nut. The circulating devices have the same number of the helical grooves of the screw, and each circulating device includes an opening at each of two ends thereof and a passage between the two openings.