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Pump Tappet

A pump and housing technology, applied in the direction of pumps, multi-cylinder pumps, fuel injection pumps, etc., can solve problems such as mid-sole damage, and achieve the effects of suppressing beating, good efficiency and good roughness

Inactive Publication Date: 2012-10-17
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, it is expected that as the fuel pump increases in pressure in the future, the load applied to the middle bottom of the tappet 4 that contacts the pump plunger 3 will increase, and the middle bottom may be damaged when the load increases.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0058] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0059] A high-pressure pump 11 provided with a tappet according to an embodiment of the present invention includes a camshaft 12 provided with a cam 12a on the outer diameter side and figure 1 Rotational movement in the direction of the arrow A in the middle; the tappet 21, which abuts against the cam 12a and converts the rotational movement of the camshaft 12 into a reciprocating linear motion and transmits it to the pump plunger 13 (hereinafter referred to as "the plunger") and Carry out reciprocating linear motion; the plunger 13 as a rod-shaped component, which abuts against the tappet 21 to perform reciprocating linear motion; a high-pressure chamber (not shown in the figure), which feeds fuel according to the reciprocating linear motion of the plunger 13 to make it high-pressure; The spring 14 is provided so as to be in contact with the tappet 21 and the plunger 13 is dis...

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PUM

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Abstract

Provided is a pump tappet which can bear a large load of a pump plunger even when an intermediate base of a case which is a structural member of the pump tappet is made thin, and which has reduced weight of the entirety thereof. A case of a pump tappet is formed from an intermediate member (40) in which an intermediate base (40c) portion has continuous fiber flow. The case of the pump tappet is formed by means of a cold forging process in which both surfaces of a center part of a round steel bar material are pressed to extrude the body of the center part to the surrounding parts and the body of the round steel bar material is caused to flow vertically in the axial direction.

Description

technical field [0001] The present invention relates to pump tappets. Background technique [0002] In direct injection engines of automobiles, high-pressure fuel pumps are used to inject high-pressure fuel into the cylinders. The high-pressure fuel pump converts the rotary motion of the camshaft provided with the cam into the reciprocating linear motion of the pump plunger, feeds fuel through the reciprocating linear motion of the pump plunger, pressurizes it in the high-pressure chamber, and injects fuel into the combustion chamber. The components of this high-pressure fuel pump include a pump tappet that transmits the rotational motion of the camshaft as a reciprocating linear motion to the pump plunger. [0003] There are various types of pump tappets, such as roller tappets equipped with roller bearings and mushroom tappets, depending on the shape of the contact portion with the cam. [0004] There is a technology disclosed in DE 10 2005 047 234 A1 (Patent Document 1)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/10
CPCF02M59/102F04B1/0426F02M2200/8053Y10T74/18296F01L2307/00
Inventor 西村雅大石真司加藤晃央
Owner NTN CORP
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