Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1998-05-28
1999-11-09
Yuen, Henry C.
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9043, 123 9045, 123 9055, F01L 124
Patent
active
059793775
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a hydraulic support element for a valve control mechanism of an internal combustion engine, including a piston guided for longitudinal displacement in a housing, with both components enclosing a pressure space which is connected to an antechamber in the piston via a check valve disposed at the lower end of the piston, whereby a sleeve-like element is arranged in the antechamber and supported in axial direction on a shoulder of the piston.
BACKGROUND OF THE INVENTION
A hydraulic support element of this type is known from U.S. Pat. No. 4,584,976 in conjunction with a tappet or a roller tappet. The sleeve-like inner element located in the antechamber has thereby the task to prevent the oil from draining from the antechamber if the support element is in an inclined orientation, whereby the sleeve-like inner element is supported by a shoulder of the piston, with the shoulder being formed by a diametrical constriction of the piston.
There is a drawback, however, that as a consequence of the diametrical constriction, i.e. to provide the piston with different inside diameters, the fabrication of the piston becomes very complex and is possible only by a material-removing process.
SUMMARY OF THE INVENTION
It is the object of the invention to develop a less cost-intensive retention for the sleeve-like inner element in the antechamber, obviating the afore-stated drawback.
This object of the invention is solved in that the shoulder is formed by a rolled-in step in the piston.
The shoulder supporting the sleeve-like inner element is thus fabricated by a non-cutting procedure, i.e. the piston has different inside diameters over its entire length, but the wall thickness of the piston remains unchanged. Consequently, the complicated material-removing manufacture of the piston for forming the different inside diameters for the shoulder is eliminated.
Several other types of attachments of the sleeve-like inner element to the piston are possible.
In accordance with one embodiment of the present invention, the unhardened sleeve-like inner element is press-fitted into the hardened piston. According to another embodiment of the present invention, the unhardened sleeve-like inner element should be swaged in the piston, and both components are hardened together. According to another embodiment of the present invention, the unhardened sleeve-like inner element is rolled-in into a groove of the hardened piston. According to another embodiment of the present invention, the unhardened sleeve-like inner element is secured to the piston with a retainer ring. Finally, according to a further development, the sleeve-like inner element is glued or welded to the piston.
Certainly, the sleeve-like inner element can be restrained and secured in the piston by methods other than those described in the dependent claims. Any type of attachment known to the skilled artisan can be employed which permits hardening of the sleeve-like inner element and/or the piston.
The invention will be described in more detail with reference to the following exemplary embodiment.
BRIEF DESCRIPTION OF THE DRAWING
It is shown in:
FIG. 1 a partial section of a side view of a hydraulic support element, and
FIGS. 2 and 3 a variation of attachment of the sleeve-like inner element.
DETAILED DESCRIPTION OF THE DRAWING
The hydraulic support element depicted in FIG. 1 is part of a valve drive (not shown) wherein the support element is operatively connected via a finger lever to a gas exchange valve. The support element essentially includes a housing 1 in the form of a hollow cylinder, in which a piston 4 comprised of an upper piston part 2 and a lower piston part 3 is slideably guided. The piston 4 is also formed as hollow body. Inside the piston 4 there is located an antechamber 5 which is connected via a bore 6 to a pressure space 7 enclosed between the lower piston part 3 and the housing 1. The connection between the antechamber 5 and the pressure space 7 is controlled by a check valve which includes a ball 8, a
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patent: 4987672 (1991-01-01), Honda et al.
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Barth Werner
Ihlemann Arndt
Schmidt Dieter
Feiereisen Henry M.
Huynh Hai
INA Walzlager Schaffler oHG
Yuen Henry C.
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