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Valve mechanism, fuel injecting device, and tappet

A technology for stoppers and rings, applied in the field of internal combustion engines, can solve problems such as poor performance, achieve the effects of reducing noise, simplifying process flow, and improving NVH performance

Pending Publication Date: 2020-07-03
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the noise, vibration and harshness (Noise, Vibration, Harshness, NVH) performance of the existing tappets is not good

Method used

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  • Valve mechanism, fuel injecting device, and tappet
  • Valve mechanism, fuel injecting device, and tappet
  • Valve mechanism, fuel injecting device, and tappet

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Experimental program
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Effect test

Embodiment Construction

[0032] It can be seen from the background technology that the noise, vibration and harshness NVH performance of the existing tappet is not good.

[0033] Combine below figure 1 Analyze the reasons for the poor NVH performance of tappets.

[0034] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a tappet.

[0035] Such as figure 1 As shown, a tappet includes: a housing 1 with a hollow cavity (not shown in the figure), the roller 6 is fixed on the housing 1 by a pin 2, and the outer peripheral wall of the housing 1 is provided with The through hole 4 ; the anti-rotation component 3 crosses the hollow cavity and protrudes out of the through hole 4 . During installation, the tappet is installed in the cylinder head and the end of the anti-rotation part protruding from the through hole is matched with the limit groove of the cylinder head. During the operation of the tappet, the cam acts on the roller of the tappet, and the roller passes through the ...

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PUM

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Abstract

The invention relates to a valve mechanism, a fuel injecting device and a tappet. The tappet comprises a shell body and a rolling wheel, wherein the whole shell body is in a tubular shape; the rollingwheel is rotatably accommodated at the end part of the shell body and supported on the circumferential side wall; the rolling wheel comprises a first stop part, a second stop part and an intermediateannular part which are arranged side by side along the axial direction of the rolling wheel, the intermediate annular part is arranged between the first stop part and the second stop part, and an annular groove is formed among the axial first end surface of the first stop part, the outer surface of the intermediate annular part and the axial second end surface of the second stop part. According to the tappet, the tappet can be prevented from rotating in the working process without additionally arranging an anti-rotation part, so that the noise is reduced, and the NVH performance of the tappetis improved; and due to the fact that the anti-rotation part is not needed to be arranged, a through hole does not need to be punched in the shell body of the tappet, so that the technological process of the tappet is further simplified, and a groove with high precision requirement matched with an anti-rotation pin does not need to be machined on an cylinder head, and the cost is further reduced.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of internal combustion engines, in particular to a valve train, a fuel injection device and a tappet. Background technique [0002] Tappets are used in valve trains or pump drives in order to cooperate with at least one cam of a camshaft or pump drive shaft to convert the rotational movement of the shaft into a translational movement of the valves or pump pistons. In the case of the valve train of an internal combustion engine, the tappet is arranged between the plunger of the high-pressure oil pump and the cam of the camshaft. When the camshaft rotates, the cam drives the tappet to reciprocate in the through hole of the cylinder head, and the tappet drives the plunger. Do reciprocating motion. In pump drives, the tappets are likewise usually arranged directly between the cam of the pump drive shaft and the corresponding pump piston. [0003] In order to ensure that the running su...

Claims

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Application Information

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IPC IPC(8): F01L1/14F01L1/047F02M59/46
CPCF01L1/047F01L1/14F01L1/143F02M59/46
Inventor 阳荣
Owner SCHAEFFLER TECH AG & CO KG