Tappet for a high-pressure fuel pump

The novel tappet design with a disk-like bridge piece and press fit connection addresses the challenge of securing the adapter tube to the housing, ensuring a lightweight and stable connection without machining or heat treatment, enabling efficient operation.

DE102024102124A1Pending Publication Date: 2025-07-31SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
DE102024102124
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-01-25
Publication Date
2025-07-31

AI Technical Summary

Technical Problem

Existing high-pressure fuel pump tappets face challenges in achieving a secure and simple connection of the adapter tube to the housing, often requiring machining and heat treatment, which can lead to detachment during operation.

Method used

A novel design featuring a disk-like bridge piece with a central ring shoulder and a press fit connection using transverse extrusion to join the adapter tube to the housing, eliminating the need for machining and heat treatment, ensuring a form fit and angular mobility.

Benefits of technology

The solution provides a lightweight, secure, and simple connection of the adapter tube to the housing, preventing detachment and maintaining a frictional connection even after heat treatment, while allowing for large cam eccentric distances.

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Abstract

A tappet (1) for a high-pressure fuel pump is proposed, comprising a hollow-cylindrical housing (2) made of sheet steel, which at its upper annular end (3) accommodates a cam follower roller (4) which runs on a bolt (26) which is seated in diametrically opposed flats (5) of the housing (2), which flats (5) extend from the upper annular end (3) and run in sections on the outer casing (6) of the housing (2), wherein the housing (2) is penetrated axially below the cam follower roller (4) by a separate, disc-like bridge piece (7), which bears against lower transverse ends (9) of the flats (5) via an edge section of its upper side (8) facing the upper annular end (3), wherein a central annular shoulder (10) projects in one piece from the bridge piece (7) in the direction of a lower annular end (11) of the housing (2), wherein the housing (2) an adapter tube (12) is extended, which on the one hand at its lower,closed end (13) forms a support for a pump piston and on the other hand, via a ring section (14) at its upper, open end (15), fits into the ring shoulder (10) of the bridge piece (7) and is fixed by a press connection (16).
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Citation Information

Patent Citations

  • Roller plunger

    DE102012214136A1

  • built roller tappet

    DE102017124274B3

  • Piston for a high-pressure fuel pump of an internal combustion engine

    DE102021107994A1