Plunger Pump Spline Connector With Crowned Teeth for Wear Reduction
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Solution Overview
Problem
The direct engagement of splines between reduction gearboxes and plunger pump devices leads to stress concentration, tooth surface wear, and potential issues like cracking and pitting due to skew angles, reducing the service life of the spline connection.
Innovation Solution
A connection system with crowned and straight teeth configurations for engaging pairs, along with a limiting mechanism to prevent excessive axial displacement, ensuring stable power transmission and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ordinary straight splines are engaged to implement power transmission, then the structure is simple and easy to manufacture, but stress concentration occurs in the contact area leading to reduced service life
Solution Approach 1:
The patent applies local quality by differentiating the tooth profile geometry at different locations. The crowned teeth configuration modifies the local contact geometry at the tooth surface to distribute stress more evenly, while maintaining straight teeth elsewhere in the engagement. This localized geometric modification resolves the contradiction by improving contact stress distribution without significantly complicating the overall manufacturing process.
Solution Approach 2:
The patent changes the geometric parameters of the spline teeth by transitioning from straight teeth to crowned teeth configuration. This parameter change modifies the contact surface geometry, transforming the line contact into a more distributed contact pattern that reduces stress concentration. The crown angle and other geometric parameters are optimized to balance manufacturing complexity with improved reliability.
2Ease of manufacture
If straight internal teeth and straight external teeth are engaged, then the manufacturing process is simple, but tooth surface wear and cracking occur under long-term operation
Solution Approach 1:
The patent introduces curvature to the tooth surface by employing crowned teeth instead of straight teeth. The crowned configuration creates a curved contact surface that distributes the load more uniformly across the tooth width, preventing stress concentration at the edges. This curvature modification significantly improves tooth surface durability by reducing wear and preventing cracking under long-term operational conditions.
3Reliability
If a connector with engaging portions is introduced to connect reduction gearbox and plunger pump device, then power transmission is improved, but device complexity increases
Solution Approach 1:
The connector is designed with universal applicability by providing multiple engaging portions that can interface with different reduction gearbox configurations. The standardized crowned tooth configuration allows the same connector design to be used across various power transmission applications, improving reliability while preventing complexity proliferation through design standardization.
Data Source
AI summary
A connection system for a plunger pump device, includes: a connector, including a shaft and first and second engaging portions provided at opposite end portions of the shaft; a reduction gearbox interface including a third engaging portion; and a plunger pump device interface including a fourth engaging portion. The first engaging portion engages with the third engaging portion to form a first engaging pair, and the second engaging portion engages with the fourth engaging portion to form a second engaging pair. The first and third engaging portions are respectively internal teeth and external teeth of the first engaging pair, or are respectively external teeth and internal teeth of the first engaging pair. The second and fourth engaging portions are respectively internal teeth and external teeth of the second engaging pair, or are respectively external teeth and internal teeth of the second engaging pair.