Radial shaft seal

A technology for radial shaft seals and rotating shafts, which is applied to the sealing of engines, components of pumping devices for elastic fluids, non-variable pumps, etc., and can solve problems such as negative pressure and no air

Active Publication Date: 2016-06-01
NIDEC GPM GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it is already filled without air at negative pressure in many workshops within the scope of repair o

Method used

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Examples

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Embodiment Construction

[0031] in figure 1 Shows the installed state of the radial shaft seal in the coolant pump according to the present invention, that is, after the final assembly.

[0032] This one figure 1 A radial shaft seal according to the present invention is shown for sealing the rotating shaft 3 leading from the pressure chamber 1 of the working housing 2 filled with a fluid medium with respect to the outer chamber 4, such as the atmosphere. A metal sealing housing 5 with a rear wall 6 is arranged in the hole of the working housing 2. The shaft through hole 7 is located inside this rear wall 6. Two ring-shaped sealing bodies 8 composed of elastic materials are arranged in the sealing shell 5, and the sealing lip 9 arranged on the sealing body 8 directly abuts against the rotating sleeve 10 arranged on the shaft 3 in an anti-rotation manner. The two sealing bodies 8 are simultaneously positioned in the sealing shell 5 by the annular metal support body 11.

[0033] What is important in the pre...

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Abstract

A radial shaft seal for sealing a rotating shaft led out from a space filled with a fluid medium, for example for sealing the drive shaft of a coolant pump, minimizes wear, especially the starting wear acting upon the sealing lips in double lip sealing systems, and allows end-of-line motor tests with coolant pumps without cooling liquid for up to several hours without damages to the radial shaft seal. The radial shaft seal includes two sealing bodies, an outer lip element on the pressure side and an inner lip element on the atmosphere side, each having a sealing cylinder resting on the shaft or the sleeve, arranged in a sealing housing with a joined metal supporting body, the sealing cylinders having three adjoining sealing cylinder regions such that on each pressure side a conical inlet surface and opposite thereof on each negative pressure side a conical outlet surface are provided, in each case a cylindrical contact zone being present between the conical inlet surface and the conical outlet surface. A lubrication chamber is defined by the outer lip, the supporting body, the inner lip element having the inner lip and the shaft, or the sleeve and is sealed on all sides, a lubricant medium which is flowable at room temperature and which has a kinematic viscosity in the range of 5,000 mm2/s to 1.000 mm2/s at a residual excess pressure of 0.005 bar to 0.01 bar being arranged in the lubrication chamber.

Description

Technical field [0001] The present invention relates to a radial shaft seal for sealing a rotating shaft drawn from a space loaded with a fluid medium. The radial shaft seal has a sealed housing, at least one that is arranged in the sealed housing and is sealed against the shaft by a sealing lip. The annular sealing body and at least one annular metal supporting body positioned inside the sealing shell are used to seal the inner chamber filled with liquid relative to the outer chamber, preferably to atmosphere. Background technique [0002] The application range of this kind of shaft seal is machinery, equipment and automobile structure, such as sealing the drive shaft of the coolant pump with respect to the thin liquid and water-based coolant with a little lubricating additive. [0003] From DE102008010338A and DE102008010341A, a radial shaft seal for a water pump is known, which has two sealing bodies arranged at a distance from each other, each of which has two sealing lips that...

Claims

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Application Information

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IPC IPC(8): F04D29/10
CPCF04D29/106F05D2240/55F16J15/322F16J15/3232F16J15/324F16J15/3268F16J15/3252
Inventor A.布莱希施密特M.绍布
Owner NIDEC GPM GMBH
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