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Plunger assembly for a high-pressure fuel pump, and high-pressure fuel pump

a high-pressure fuel pump and assembly technology, applied in the direction of piston pumps, positive displacement liquid engines, machines/engines, etc., can solve problems such as wear, and achieve the effect of preventing the rotation of the plunger assembly and simplifying production

Inactive Publication Date: 2014-09-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a plunger assembly for a pump. It includes a support element with a recess where a running roller is mounted. To keep the running roller in place, a retention element is attached to the support element to prevent it from spinning. This ensures smooth operation of the pump.

Problems solved by technology

It is not only the running roller, but also those surfaces of the other components of the plunger assembly that are in frictional contact with the running roller, that are subject to wear.

Method used

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  • Plunger assembly for a high-pressure fuel pump, and high-pressure fuel pump
  • Plunger assembly for a high-pressure fuel pump, and high-pressure fuel pump
  • Plunger assembly for a high-pressure fuel pump, and high-pressure fuel pump

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Embodiment Construction

[0023]The high-pressure pump illustrated as a detail in the region of a plunger assembly in FIG. 1 comprises at least one pump element with a reciprocatingly guided pump piston 1 which is supported, via a plunger assembly, on a cam 2 of a drive shaft 3. The plunger assembly is received in an axially displaceable manner in a housing bore 11 of a housing part 20 of the high-pressure pump.

[0024]The illustrated plunger assembly comprises a sleeve-shaped plunger body 13 and, received therein, a support element 4 with a recess 5 for the rotatable mounting of a running roller 6. Via the running roller 6, the plunger assembly is supported directly on the outer circumference of the cam 2 of the drive shaft 3. A restoring spring 14 ensures the abutment of the plunger assembly against the cam 2.

[0025]The restoring spring 14 and the support element 4 of the plunger assembly are supported in each case on opposite sides of an annular collar 16 of the plunger body 13, wherein the restoring spring ...

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Abstract

The invention relates to a plunger assembly for a high-pressure fuel pump for supporting a reciprocating pump piston (1) of a pump element on a cam (2) of a drive shaft (3), comprising a supporting element (4) with a recess (5), in which a running roller (6) is mounted rotatably. According to the invention, it is provided that, furthermore, a holding element (7) is provided for holding the running roller (6) in the recess (5) of the supporting element (4), which holding element (7) is connected to the supporting element (4) in a positively locking manner, wherein the positively locking connection brings about an anti-rotation safeguard of the holding element (7) with respect to a longitudinal axis A of the pump piston (1).

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a plunger assembly for a high-pressure fuel pump for supporting a reciprocatingly movable pump piston of a pump element on a cam of a drive shaft, comprising a support element with a recess in which a running roller is rotatably mounted . The invention furthermore relates to a high-pressure fuel pump having a plunger assembly of said type.[0002]A plunger assembly of the above-mentioned type emerges for example from DE 10 2008 000 699 A1. Said plunger assembly comprises a hollow cylindrical plunger body in which a roller shoe for the rotatable mounting of a running roller is accommodated. Via the running roller, a pump piston of a pump element can be supported on a cam of a drive shaft, such that the pump piston is driven in a reciprocating movement when the drive shaft rotates. A restoring spring ensures the restoring movement of the pump piston by virtue of the restoring spring being supported on a spring plate which...

Claims

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Application Information

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IPC IPC(8): F04B9/04
CPCF04B9/042F04B1/0417F04B1/043F04B1/0439
Inventor GREINER, MATTHIAS
Owner ROBERT BOSCH GMBH