High-Pressure Fuel Pump Holding Member Design
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Solution Overview
Problem
High-pressure fuel pumps with metal dampers require multiple components and complex processing, increasing manufacturing costs and component count.
Innovation Solution
A high-pressure fuel pump design featuring a metal damper housed in a damper housing with a damper cover and a holding member that uses an elastic portion to urge the metal damper toward the cover, reducing the number of components and eliminating the need for complex pump body processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two pressing members (upper and lower clamping members) are used to hold the metal damper, then the metal damper is securely held, but the number of components increases and manufacturing cost increases
Solution Approach 1:
The patent combines the functions of the upper clamping member and lower clamping member into a single holding member. This holding member has a clamping portion that contacts the metal damper from one side only, eliminating the need for two separate pressing members while maintaining secure holding of the metal damper between the pump body and damper cover
Solution Approach 2:
The holding member serves multiple functions: it acts as both the upper clamping member and lower clamping member simultaneously, provides positioning for the metal damper, and maintains the clamping force through its elastic portion. This multi-functional design reduces the total component count while ensuring reliable damper holding
2Manufacturing precision
If processing is performed on the pump body to position the upper and lower clamping members, then the clamping members are properly positioned, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the positioning function from the pump body and transfers it to the holding member itself. The holding member incorporates positioning protrusions or features that directly position the metal damper without requiring corresponding positioning structures to be machined into the pump body, thereby eliminating complex pump body processing
Solution Approach 2:
The holding member acts as an intermediary component that provides positioning features without requiring the pump body to be processed. Instead of modifying the pump body to accommodate clamping members, the holding member carries its own positioning geometry that interfaces directly with the metal damper and pump body surfaces
3Reliability
If multiple components are used for the damper holding mechanism, then the metal damper is securely held, but assembly and processing steps become complex
Solution Approach 1:
The patent merges multiple clamping and positioning functions into a single holding member component. This integration reduces the number of parts that need to be assembled and positioned, simplifying the assembly process while maintaining secure holding of the metal damper through the combined clamping and positioning features of the holding member
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 reduces the number of components and manufacturing costs while maintaining effective pressure pulsation reduction, simplifying assembly and processing steps.
Implementation Method 1
the holding member is provided with an elastic portion that urges the pump body so that the metal damper is urged toward the damper cover
Data Source
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AI summary
A high-pressure fuel pump capable of reducing the number of components and decreasing the manufacturing cost by processing of a pump body is provided. The high-pressure fuel pump includes a metal damper 9, a pump body 1 in which a damper housing 1p that houses the metal damper 9 is formed, a damper cover 14 attached to the pump body 1, covering the damper housing 1p, and holding the metal damper 9 between the pump body 1 and the damper cover 14, and a holding member 9a fixed to the damper cover 14 and holding the metal damper from a side opposite to the damper cover 14. The holding member 9a is provided with an elastic portion E that urges the pump body 1 so that the metal damper 9 is urged toward the damper cover 14