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Sealing device for sealing valve stem, and tools and methods for installation

A sealing device and valve stem technology, applied to the sealing device used to seal the valve stem, can solve the problems of unbearable and heavy burden

Active Publication Date: 2021-06-04
AB SKF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However this solution is burdened at pressures greater than 15 bar and it may not be able to withstand the pressure

Method used

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  • Sealing device for sealing valve stem, and tools and methods for installation
  • Sealing device for sealing valve stem, and tools and methods for installation
  • Sealing device for sealing valve stem, and tools and methods for installation

Examples

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Effect test

Embodiment Construction

[0034] Figure 1a and Figure 1bA comparative example of a valve stem sealing device 100 for an internal combustion engine is shown. The dotted line marks the axial direction along which the valve stem can move relative to the valve stem sealing device 100 . The valve stem seal 100 is mounted on the guide 105 . The guide 105 has an undercut 110 which runs around in the circumferential direction of the guide 105 . The valve stem seal 100 includes a gusset 115 which radially surrounds a part of the sealing material 120 of the valve stem seal 100 . In addition, the sealing material 120 also has a radially inward converging opening 125 which engages in the undercut 110 when the valve stem sealing device 100 is assembled. The sealing material 120 can thus be clamped onto the guide 105 . The gas sealing lip 130 and the oil sealing lip 135 respectively seal the gas chamber and the oil chamber on the valve stem. In addition, the gusset 115 also has radial converging openings 140 ...

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PUM

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Abstract

The invention relates to a sealing device (200) for sealing a valve stem in an internal combustion engine. The sealing device (200) comprises: a sealing lip (205) made of an elastomer (210), designed so that it can be The side surface of the stem perpendicular to the radial direction is in contact. Furthermore, the sealing device (200) also includes a retaining structure (215) fixedly connected to the sealing lip (205), which consists of another material different from the material of the elastomer (210) from which the sealing lip (205) is made. The design of the retaining structure should achieve the following function: a form fit can be produced directly in the axial direction between the retaining structure ( 215 ) and the guide element ( 220 ) of the valve stem through the plastic deformation in the radial direction.

Description

technical field [0001] The field of the invention is sealing devices for sealing valve stems, and tools and methods for mounting sealing devices on guide elements of valve stems. Background technique [0002] In the technical field of internal combustion engines, conventional valves are generally used which are used to control the intake of fresh air or the discharge of exhaust gases and which are equipped with a valve stem seal (VDR) for sealing the combustion chamber of the internal combustion engine. For various internal combustion engine types, such as modern truck engines, the valve stem seal must be able to withstand pressures of several bar during engine braking operation. For this purpose, the sealing device can comprise an air-sealing lip facing the air side as well as a reinforced rubber flange for ensuring a reliable connection to the guide. In most cases, the undercuts of the guides are trapezoidal in shape, into which the rubber lugs engage. However, at high p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/08B25B27/00
CPCB25B27/0028F01L3/08F01L2301/00F01L2303/01F16J15/3268F01L13/06F01L2820/01F16K41/08F16J15/3252F16J15/3232
Inventor H·贝内迪克斯C·埃克M·奥思C·帕索W·西瓦尔德
Owner AB SKF
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