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tappet

A housing and segment technology, applied in the direction of fuel injection pump, cam follower, belt/chain/gear, etc., can solve the problems of guiding or sealing, high cost of tappet cutting and manufacturing, restrictions, etc.

Active Publication Date: 2017-11-21
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This negatively affects the mass moment of inertia of the entire tappet
Furthermore, it has been found that the height of the tappet, the so-called "drawing depth", is limited by the above-mentioned production process, which can lead, for example, to guiding or sealing problems on its outer peripheral side
In this case, the machining cost of the tappet is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] From figure 1 You can see tappet 1. The tappet is provided for use in a high-pressure fuel pump of an internal combustion engine.

[0017] The tappet 1 has a tubular housing 2. The housing contains a roller 5 for cam activation in the area of ​​the upper annular end face 3. The roller is supported on a pin 4 which is supported by each end 6 thereof in a flat portion 8 which is recessed integrally from the outer peripheral side 7 of the housing 2.

[0018] In the housing 2, a mechanism 9 for indirectly stopping the pump piston as a tappet follower is provided below the roller 5 in the axial direction. The pump piston itself, as shown for example in DE 10 2010 022 318 A1, rests on the underside of a bridge, which can be supported on the flat portion 8 extending on the side of the other annular end surface 14 of the housing 2 On the lower end surface 13. Therefore, the lower end surface 13 of the flat portion 8 functions as the mechanism 9.

[0019] The housing 2 of the tapp...

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PUM

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Abstract

A tappet (1) having a tube-like housing (2), which in the region of one of the end faces (3) thereof receives a roller (5) running on a pin (4) and serving for contact with a periodic stroke generator. The pin (4) is mounted via the ends (6) thereof in a flat (8) that is indented from an outer surface (7) of the housing, wherein in the housing (2), axially beneath the roller (5), means (9) are provided for an at least indirect bearing of a tappet follower member. The housing (2) is formed of an extruded profile having profiling on the inner surface (10) of the housing (2), wherein, viewed in a circumferential direction of the housing (2), at least twothick-wall profile segments and two thin-wall profile segments (11, 12) are present. The thick-wall profile segments lie diametrically opposite each other and the thin-wall profile segments lie diametrically opposite each other, and the flat portions (8) are located in the thick-wall profiled segments (11).

Description

Technical field [0001] The present invention relates to a tappet having a tubular housing which accommodates in the region of its annular end surface a roller for starting a circulating stroke generator running on a pin, which pin passes through its end The part is supported in a flat part recessed from the outer peripheral side of the housing, wherein a mechanism for at least indirectly stopping the tappet follower is provided in the housing under the roller in the axial direction. Background technique [0002] A tappet of the aforementioned type is known from DE 10 2010 022 318 A1, which is used for high-pressure fuel pumps of internal combustion engines. The tubular shell is either deep-drawn or made by extrusion technology. It has a substantially constant wall thickness. The housing is over-specified in some wall sections and is therefore too heavy. This has a negative impact on the mass moment of inertia of the entire tappet. In addition, it has been confirmed that the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/14F02M59/10
CPCF01L1/14F01L2305/00F02M59/102Y10T74/2107F16H53/06
Inventor 斯特凡·多恩诺伯特·盖耶
Owner SCHAEFFLER TECH AG & CO KG