Spark plug function incorporated engine valve and valve mechanis

Details Spark plug function incorporated engine valve and valve mechanis Spark plug function incorporated engine valve and valve mechanis

1998-07-29

1999-12-28

Wolfe, Willis R.

Internal-combustion engines

Igniters

Sparkers

123152, 313125, F02P 1300

Patent

active

06006711&

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an engine valve integral with spark plug features and a valve operating mechanism equipped with an engine valve integral with spark plug features.


PRIOR ART

There are some prior arts with respect to an engine valve which is provided with both features of a spark plug and those of an engine valve, which are, for example, a first technology (Japanese Laid-open Utility Model No. 11833 of 1985) shown in FIG. 8 and a second technology (U.S. Pat. No. 3,982,506) shown in FIG. 9.
The first technology is constructed so that a spark plug 31 is screwed into a cylindrical hollow type valve stem 32 to be integral with each other, and the second technology is also constructed so that the spark plug 31 is screwed into the cylindrical hollow type valve stem 32 to be integral with each other.
That is, in any one of the technologies, such a construction is employed, in which an independently formed spark plug component is screwed into a cylindrical hollow type valve stem of an engine valve which is formed separately therefrom.
Since the abovementioned prior arts have the following problems and shortcomings, it is remarkably difficult to employ them in general gasoline engines.
(1) Taking into consideration a construction in which a plug is screwed into a cylindrical hollow stem of a valve and the caliber of a spark plug removing tool such as a plug wrench, etc., the outer diameter of an engine valve body is increased to cause the weight to be accordingly increased, whereby the load of operating the valve is unavoidably increased.
(2) Since the caliber of the engine valve body is large, the valve accommodation space of a valve operating mechanism is enlarged to cause the layout of the valve operating mechanism to be limited, and the heat efficiency is worsened.
Therefore, the invention was developed in view of solving the problems and shortcomings of the prior arts, and it is therefore an object of the invention to provide an engine valve integral with spark plug features, which is applicable to general gasoline engines and has compact dimensions.


DISCLOSURE OF THE INVENTION

In order to achieve the abovementioned object, the invention employs a means for forming major components of a spark plug integrally with an engine valve member.
That is, the means is such that spark plug features are made integral with an engine valve by burying the first electrode rod, which is exposed to the cylinder-side plane of a bevel portion and constitutes the center electrode, in the engine valve body in which the bevel portion for closing the intake and exhaust pass open to the cylinder is formed to be integral with the valve stem and forming the second electrode portion which is exposed to be L-shaped from the cylinder-side plane of the bevel portion and constitutes the grounding electrode opposite to the center electrode.
Herein, either of a conductive material or insulative material may be used as an engine valve body member.
Firstly, in an engine valve body which is made of conductive material in order to function as a conductive line, the first electrode rod which becomes the center electrode is buried in the valve body with an insulative material intervened between the electrode and the engine valve body, and the second electrode portion which is opposite to the center electrode and constitutes the grounding electrode forming a spark gap is provided on the cylinder-side plane of the bevel portion to be integral with the engine valve body.
Next, in an engine valve body which is made of insulative material, while the first electrode rod of the center electrode is formed by burying the same in the valve stem, the second electrode portion which is opposite to the first electrode rod on the cylinder-side plane of the bevel portion and constitutes the grounding electrode forming a spark gap is provided so that the same is caused to pass from the valve stem head portion through right below the bevel portion of the valve body and is formed by exposing one end of the electrode rod ext

REFERENCES:
patent: 3982506 (1976-09-01), Holtrop
patent: 5000135 (1991-03-01), Taguma
patent: 5463267 (1995-10-01), Conway

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