Three-hole needle valve speed reducing piece and overflow valve needle valve assembly for high-pressure fuel pump

By designing a three-hole needle valve speed reduction plate and adopting a teardrop-like and swirl-like structure, the problem of needle valve speed reduction plate in the prior art is easily broken under high pressure, achieving higher strength and durability, and improving the stability of the high-pressure fuel pump and the reliability of the fuel system.

CN222668290UActive Publication Date: 2025-03-25DELPHI SHANGHAI DYNAMICS AND PROPULSION SYSTEMS CO LTD
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Patent Information

Application Number
CN202421493543.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-27
Publication Date
2025-03-25
Estimated Expiration
2034-06-27

AI Technical Summary

Technical Problem

The needle valve reduction plate in existing high-pressure fuel pumps is prone to break under high-strength hydraulic shock, resulting in failure of the pump performance and difficulty in maintaining stability in high-pressure systems.

Method used

A three-hole needle valve speed reduction plate was designed, adopting a teardrop-like structure and a three-hole design. Through the design of arc transition connection and reinforcement of edges, the strength of the needle valve speed reduction plate is enhanced and material waste is reduced through the swirl-like structure.

Benefits of technology

This design can maintain stability under higher oil pressure shock, improves the durability of the relief valve needle valve assembly, prevents large-diameter particles from entering the high-pressure chamber, and improves the reliability of the entire fuel system.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model relates to a three-hole needle valve speed reduction piece and overflow valve needle valve assembly for a high-pressure fuel pump, the needle valve speed reduction piece comprises speed reduction heads, connecting arms and an outer ring, a plurality of speed reduction heads are connected with the outer ring through the connecting arms, each speed reduction head is provided with three overflow holes, the speed reduction heads are in transition connection with the connecting arms through arcs, and the connecting arms are connected with the outer ring through the connecting arms. And the circular speed reducing head and the connecting arm form a teardrop shape. Compared with the prior art, the strength of the needle valve speed reduction piece can be enhanced, the durability of the needle valve assembly of the overflow valve is improved, the use stability of a high-pressure fuel pump is guaranteed, large-diameter particles are effectively prevented from entering a high-pressure cavity and a subsequent fuel system, and the reliability of the whole fuel system is improved.
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