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Plunger

A technology of push rod and shell, applied in the field of push rod, can solve problems such as change, and achieve the effect of simple modeling

Active Publication Date: 2015-03-04
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of increasing the radius of the pushrod to accommodate the enlarged roller, its guide on the pump side had to be increased forcibly, which resulted in a considerable change of the completed pump design

Method used

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Examples

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Embodiment Construction

[0018] The shown pushrod 1 is used here for a high-pressure pump of diesel fuel for an internal combustion engine. The push rod 1 has a tube-like housing 2 which accommodates a roller 4 for actuating a lifting cam within an inner side 5 of the housing in the region of a first upper annular end edge 3 .

[0019] Axially below the rollers 4 , the housing 2 , here deep-drawn from sheet steel, is traversed by a separate bridge 9 . The bridge is a punched plate, the underside 11 of which faces the lower second annular end edge 10 of the housing 2 and serves as an abutment for the pump piston.

[0020] As shown, the rollers 4 run on pins 17 via rolling bearings 20 . The pins 17 are accommodated with each end (referred to here as the shaft end 7 ) in a part-cylindrical receptacle 8 of the respectively retracted region 18 of the housing 2 , which is designed as a flat part.

[0021] The inner side 5 of the housing 2 has a pocket-shaped material constriction. This material constrict...

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Abstract

The invention relates to a plunger (1) for a fuel injection pump, having a tube-like housing (2), which accommodates a roller (4) for the running of a periodic lift generator inside the inner jacket (5) thereof in the region of a first ring end (3). Said roller has axial stumps (7) projecting from the end faces (6) of the roller, by means of which stumps the roller sits in recesses (8) in the housing (2), wherein the housing (2) is penetrated axially by a bridge piece (9) underneath the roller (4), the underside (11) of which bridge piece, which faces a second ring end (10) of the housing (2), acts as a rest for a plunger following part. The inner jacket (5) of the housing (2), proceeding from the first ring end thereof in the direction of the second rind end (3, 10) and at least in the circumferential section (13) thereof, which surrounds an outer jacket (12) of the roller (4), has a pocket-like thinned portion of material (14), which levels out under a half of the height of the roller (4) and into which the ring edges (15) of the roller (4) project.

Description

technical field [0001] The invention relates to a push rod, in particular for a pump or a compressor, which has a tube-like casing which accommodates a useful For operating the roller of the periodic stroke generator, the roller has a one-piece or multi-piece shaft end protruding from its end side, via which the roller is located in the receptacle of the housing, wherein the housing is axially The upper side is traversed below the roller by a bridge whose underside facing the second annular end edge of the housing serves at least indirectly as an abutment for the pushrod driver. Background technique [0002] Such a push rod is known from DE 10 2010 022 318 A1. It is used in highly loaded fuel injection pumps of qualitatively or quantitatively controlled internal combustion engines. [0003] As the load-bearing capacity requirements of the plunger increase, for example due to increased speed and increased injection pressure, a more robust design of the plunger is required, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10F04B1/04F04B27/04F01L1/14
CPCF04B1/0408F02M59/102F01L2105/00F01L2101/00F01L2103/00F01L1/146F04B1/0426F02M2200/03F01L2301/00F01L2303/00F01L2305/00
Inventor 斯特凡·多恩诺伯特·盖耶
Owner SCHAEFFLER TECH AG & CO KG
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