High Pressure Fuel Pump Piston Foot Design
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Solution Overview
Problem
The existing high-pressure fuel pumps for internal combustion engines face challenges in designing a simple and reliable driving connection between the pump cylinder and the sleeve-shaped support body, leading to complex connections and reduced reliability due to transverse forces generated by the eccentric drive.
Innovation Solution
A fluid pump design featuring a one-piece widened pump piston foot with a locking ring connection, where the retaining ring is partially arranged in an inner peripheral groove of the sleeve-shaped support body, allowing direct transfer of forces and reducing the need for separate connecting parts, thereby enhancing reliability and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex connection arrangement with multiple parts is used to connect the sliding shoe to the pump piston and sleeve-shaped support body, then the connection can be realized, but the device complexity increases and reliability decreases
Solution Approach 1:
The pump piston foot is designed as a one-piece integral structure that combines the functions of the sliding shoe and connection elements. The widened first foot section integrates the bearing surface and connection interface, while the widened second foot section provides additional support. This merging of functions into a single component eliminates multiple separate parts and their connections, thereby reducing device complexity while improving connection reliability through the integral design.
2Device complexity
If the retaining ring is arranged in the outer peripheral groove of the pump piston foot, then the connection is simplified, but the force transmission and structural stability are reduced
Solution Approach 1:
The retaining ring connection is extended from a single-plane arrangement to a multi-dimensional configuration. The retaining ring is arranged in both the outer peripheral groove of the pump piston foot and the inner peripheral groove of the sleeve-shaped support body, creating a distributed three-dimensional connection structure. This dimensional extension allows the retaining ring to provide both simplified installation and enhanced force transmission through multiple contact points and broader load distribution.
Data Source
Figure 1
Figure 2
AI summary
The fluid pump has a pump piston (10a) with a pump piston base (30a), where a circlip is arranged partially in an outer circumference groove of the pump piston base and partially in an inner circumference groove of a sleeve-shaped supporting body (14a). The pump piston base has a widened base section, at which the outer circumference groove for the circlip is arranged, and another base section projecting over an end of the sleeve-shaped supporting body. The end of the sleeve-shaped supporting body rests on the other base section.