Piston-pin bearing for internal combustion engines
A technology of piston pin and internal combustion engine, which is applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problems of improving the possibility and noise of the engagement between the piston pin and the hub hole, achieve the effect of small tangential stress and improve the life of the piston
Inactive Publication Date: 2007-10-31
MAHLE GMBH
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Problems solved by technology
This increases both the likelihood of seizure and the noise between the piston pin and the hub bore
Method used
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[0026] As can be seen in FIG. 1, a piston 1 for an internal combustion engine has a hub bore 2 with an upper hub region and a lower hub region, in which bore a cylindrical piston pin (not shown) is supported. According to FIGS. 1 and 2 , the upper hub area is arranged on the gas side, wherein the surface of the hub bore 2 is formed on the periphery along the entire hub longitudinal axis X in the region of hub equator-apex-hub equator in a highly elliptical manner, The parameters of the ellipse are:
[0027] z=b / 2×cosα
[0028] y=a / 2×sinα, 0°≤α≤180°
[0029] Wherein, (z, y) is the coordinate of any point on the ellipse in the coordinate system shown in FIG. 2 .
[0030] In the lower region 2.2 of the hub bore 2, the surface of the hub bore 2 is formed cylindrically along the entire hub longitudinal axis X between the hub equator-the hub bottom point-the hub equator, wherein the two hub regions are suitable for :
[0031] a : large ellipse diameter,
[0032] b=D: small elli...
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The invention relates to a piston-pin bearing for an internal combustion engine wherein a cylindrical piston pin ( 8 ) is mounted. The inventive piston-pin bearing is provided with an improved form of hub bore in comparison with prior art, significantly reducing mechanical stress in said piston and therefore resulting in a longer service life for said piston. Said form also avoids the formation of noise in the piston-pin bearing. According to the invention, this is achieved by providing the lateral surface ( 5 ) of the hub bore ( 2 ) with a highly oval shape along the entire axis of the hub in the equatorial-zenith-equatorial area of said hub, corresponding to the parameter representation of an oval x=b/2xcos }; y=a/2xsin}for 0o==180o, and by providing it with a circular cylindrical shape in the equatorial-nadir-equatorial region of the hub, whereby a: large oval diameter; b=D: small oval diameter; D: diameter of the cylindrical hub; : the angle forming any particular unlimited line counter to the z axis. A piston-pin bearing for an internal combustion engine wherein a cylindrical piston pin is mounted. The piston-pin bearing has a hub bore that significantly reduces mechanical stress in the piston, results in a longer service life for the piston, and avoids the formation of noise in the piston-pin bearing. Thus hub bore has a lateral surface with a highly oval shape along the axis of the hub in the equatorial-zenith-equatorial area, corresponding to the parameter representation of an oval that follows x=b/2xcos alpha; y=a/2xsin alpha for 0 DEG <=alpha<=180 DEG . The hub bore has a circular cylindrical shape in the equatorial-nadir-equatorial region of the hub, whereby a is a large oval diameter; b=D is a small oval diameter; D is a diameter of the cylindrical hub; and alpha is the angle forming any particular unlimited line counter to the z axis.
Description
technical field [0001] The invention relates to a piston pin bearing for an internal combustion engine with hub bores in which a piston pin is supported. Background technique [0002] It is known, for example, from DE2152462B2, DE4141279A1 and DE3036062C2 that the hub bore of a piston of an internal combustion engine is designed to be load- and deformation-suitable. The hub shape mentioned there is based on the knowledge that the gas forces acting on the piston top are transmitted to the piston pin via the pin seat, whereby the piston pin is periodically bent due to its rotation in the connecting rod. According to general assumptions, the hub bore is therefore subjected to tensile, compressive and bending stresses in the horizontal plane and in the vertical plane, in particular at the top and bottom points of the hub bore. In order to be able to accommodate this deformation, DE2152462B2 proposes a hub shape in which the generatrix of the hub hole is curved, the axis of the ...
Claims
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IPC IPC(8): F16J1/16F02F3/00
CPCF16J1/16
Inventor D·魏因考夫G·楚格施韦特
Owner MAHLE GMBH
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