Spring Retaining Sleeve Optimized Chamfer Press-Fit Stability
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Solution Overview
Problem
Long press-fit assemblies in high-pressure fuel valves face issues with coaxiality errors leading to jittering and seizing effects during press-fitting, and existing solutions fail to economically produce stable press-fit assemblies that can absorb significant flow forces.
Innovation Solution
A spring retaining sleeve with an optimized insertion chamfer angle of 18 to 22 degrees and a lubrication groove, ensuring a uniform lubricant supply and reducing friction, addresses coaxiality errors and enhances the press-fit assembly's ability to absorb flow forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a long press-fit assembly is used to absorb major flow forces, then the ability to absorb flow forces is improved, but coaxiality errors cause jittering and seizing effects during press-fitting
Solution Approach 1:
The patent changes the geometric parameters of the press-fit assembly by introducing an optimized insertion chamfer with a specific angle range (15-30 degrees) and ratio relationships between chamfer dimensions and press-fit dimensions. This parameter optimization resolves the contradiction by enabling long press-fit assemblies to be installed without jittering or seizing, while maintaining the length needed to absorb flow forces
2Stability of the object's composition
If the press-fit assembly is made longer to increase elasticity, then the elastic properties are improved, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent establishes specific parameter relationships including the chamfer angle (15-30 degrees) and the ratio of chamfer height to press-fit length (0.05-0.2). These optimized parameters allow long press-fit assemblies to maintain manufacturing precision and coaxiality during installation, enabling the assembly to achieve the necessary length for elastic properties without sacrificing manufacturing quality
3Ease of operation
If an optimized insertion chamfer is provided, then the press-fitting operation becomes smoother, but the device complexity increases
Solution Approach 1:
The patent optimizes the chamfer geometry by specifying a practical angle range (15-30 degrees) and dimensional ratios that balance operational smoothness with manufacturing simplicity. The optimized parameters enable smooth press-fitting operations while keeping the chamfer geometry relatively simple and economically manufacturable
Solution Approach 2:
The patent applies the chamfer optimization locally at the insertion end of the press-fit assembly, where it is most needed to prevent jittering and seizing during installation. This localized approach improves ease of operation without unnecessarily complicating the entire device structure
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 optimized chamfer angle and lubrication groove design reduce jittering and seizing effects, maintain the spring retaining sleeve's position, and ensure a stable, elastic press-fit assembly capable of handling high flow forces, thereby ensuring consistent operation of the high-pressure valve.
Implementation Method 1
the cylinder press-fit connection surface has at least one lubrication groove. By means of the lubrication groove, a uniform supply of lubricant as the spring retaining sleeve is press-fitted in can be ensured
Implementation Method 2
a relatively long, elastic press-fit assembly which makes it possible to absorb major flow forces
Data Source
AI summary
A spring retaining sleeve includes a cylinder press-fit connection surface which has a press-fit diameter and a press-fit length. To enable cost-effective production of a stable press-fit assembly, at least one end of the cylinder press-fit connection surface, an optimized insertion chamfer for long press-fit assemblies is provided with a ratio of press-fit diameter to press-fit length of greater than thirty five percent.