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Fuel pump

A fuel pump and pump piston technology, which is applied to fuel injection pumps, fuel injection devices, special fuel injection devices, etc., can solve problems such as unfavorable expenditure and cost, and achieve the effect of preventing deflection

Active Publication Date: 2016-10-26
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is also considered to be disadvantageous with respect to expenditure and cost in terms of construction

Method used

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  • Fuel pump
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Embodiment Construction

[0026] First, refer to figure 1 , Figure 1a and Figure 1b , the components and their relative positions with respect to each other will be described in the case of the known fuel pump 1 ′. The fuel pump 1' comprises a pump piston 2', the upper longitudinal end 3' of which protrudes into the cylinder chamber in the viewing direction. The camshaft 4' comprises a central shaft 5' and at least one cam 6' mounted thereon rotationally coupled (that is, so that the cam 6' cannot rotate relative to the shaft 5'). The fuel pump 1' includes a roller tappet 7'. The roller tappet has a tappet body 8' and a roller 9' on which the roller is held in a manner not shown in more detail so as to be able to rotate around a central geometric (ie imaginary linear ) rotation axis 11' rotation. The roller tappet 7' is arranged between the pump piston 2' and the cam 6'. Roller lifters 7' and beyond figure 1 is coupled to the pump piston 2' in such a way that both parts perform the same moveme...

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Abstract

The present invention relates to a fuel pump (1), at least comprising: a pump piston (2), a camshaft (4) which has at least one cam (6), a roller tappet which is arranged between the pump piston (2) and the cam (6) and has a tappet body (8) and a roller (9) which is held thereon rotatably, wherein the pump piston (2) and the tappet body (8) are movement-coupled with regard to movements in directions which are parallel to the piston longitudinal centre line (10), wherein the roller (9) is in contact with the cam (6), wherein a geometric reference line (20) which extends the piston longitudinal centre line (10) rectilinearly intersects the geometric rotational axis (11) of the roller (9), and wherein the tappet body (8) has a tappet body longitudinal centre line (13) which is parallel to the reference line (20). It is proposed for the advantageous development that the tappet body longitudinal centre line (13) runs at a lateral spacing (a) from the geometric reference line (20) in a projected view which is oriented parallel to the geometric rotational axis (11) of the roller (9).

Description

technical field [0001] The invention relates to a fuel pump comprising at least a pump piston, a camshaft with at least one cam, a roller tappet disposed between the pump piston and the cam and having a tappet body, and a rotatably held rollers on which the pump piston and tappet body are kinematically coupled with respect to movement in a direction parallel to the longitudinal centerline of the piston, wherein the rollers contact the cam, wherein the geometric reference line forming the rectilinear extension of the longitudinal centerline of the piston and The geometric axes of rotation of the rollers intersect and wherein the lifter body has a lifter body longitudinal centerline parallel to the reference line. Background technique [0002] A fuel pump of this type is used, for example, as a high-pressure fuel pump of a fuel injection system of an internal combustion engine. The rollers of the roller lifters bear against the circumferential surface of the cam. The tappet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10
CPCF02M59/102F01L2307/00F02M2200/8015F02M59/02F02M59/44F02M2200/80
Inventor T.施米德鲍尔
Owner VTESCO TECH GMBH