Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Reexamination Certificate
2001-11-16
2002-11-12
Lo, Weilun (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
C123S090550, C251S129100, C251S129160
Reexamination Certificate
active
06477994
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic driving valve of an internal combustion engine for opening and closing an intake and exhaust port of an internal combustion engine.
2. Description of the Prior Art
Conventionally, there has been known an electromagnetic driving valve for driving a valve portion opening and closing an intake and exhaust port of an internal combustion engine, by an electromagnet. This kind of electromagnetic driving valve is provided with a movable plate connected to a transmission shaft extending to the above of the valve portion, and a pair of electromagnets vertically opposing to each other via the movable plate. The movable plate is sucked due to an electromagnetic force which both of the electromagnets alternately generate, thereby moving between both of the electromagnets. Further, when the movable plate is adsorbed to the upper electromagnet, the valve portion closes the intake and exhaust port, and when the movable plate is adsorbed to the lower electromagnet, the valve portion opens the intake and exhaust port.
In this kind of electromagnetic driving valve, an electromagnetic force applied to the movable plate from each of the electromagnets becomes smaller when a distance between the movable plate and the electromagnets sucking the movable plate is increased, and it becomes gradually larger in accordance that the movable plate moves close to the electromagnet. Accordingly, since a displacement speed of the movable plate is increased in accordance that the movable plate moves close to the electromagnet, and the valve portion quickly sits on the intake and exhaust port in accordance therewith, there is a disadvantage that an impact sound and a vibration are generated at a time of closing the valve.
Further, the transmission shaft is separated into a first transmission shaft extended from the valve portion for absorbing an elongation due to a thermal expansion or the like and a second transmission shaft supporting the movable plate. At this time, a spring for urging the valve portion in a valve closing direction is provided in the first transmission shaft. Further, when the movable plate is adsorbed to the upper electromagnet, the valve portion is closed due to the urging force of the spring and a gap on the basis of the thermal expansion or the like is formed between both of the transmission shafts. Further, when the movable plate moves apart from the upper electromagnet, the second transmission shaft is brought into contact with the first transmission shaft, and opens the valve portion against the urging force of the spring. Accordingly, when the movable plate moves apart from the upper electromagnet toward the lower electromagnet at a time of a valve opening operation, there is a disadvantage that the second transmission shaft comes into contact with the first transmission shaft, whereby the impact sound and the vibration are also generated from a contact portion between both of the transmission shafts.
SUMMARY OF THE INVENTION
The present invention is made so as to solve the disadvantages mentioned above, and an object of the present invention is to provide an electromagnetic driving valve of an internal combustion engine provided with a significantly compact shock absorbing means which can reduce an impact sound and a vibration in a contact portion between a first transmission shaft and a second transmission shaft and reduce an impact sound and a vibration generated at a time when a valve portion sits on an intake and exhaust port at a time of closing a valve.
In order to achieve the object mentioned above, in accordance with the present invention, there is provided an electromagnetic driving valve of an internal combustion engine comprising:
a valve portion moving in contact with and apart from an intake and exhaust port of the internal combustion engine so as to open and close an intake and exhaust passage;
a first transmission shaft extended from the valve portion toward the above;
a second transmission shaft extended on the same axis of the first transmission shaft so as to move according to a movement of the first transmission shaft;
a pair of electromagnets to which said second transmission is inserted, and opposing to each other in a vertical direction with keeping a gap in an axial direction of the second transmission shaft;
a movable plate provided in the second transmission shaft positioned between both of the electromagnets and moving between both of the electromagnets in correspondence to a magnetic suction between both of the electromagnets, thereby opening and closing the valve portion via the second transmission shaft and the first transmission shaft; and
a pair of spring members provided so as to vertically oppose to each other via both of the electromagnets and urging the first transmission shaft and the second transmission shaft in respectively opposing directions so as to hold the movable plate and the valve body at a predetermined position,
wherein a shock absorbing means provided in the electromagnetic driving valve comprises:
a contact connecting means connected to an upper end of the first transmission shaft and freely extending and compressing while maintaining a contact with a lower end of the second transmission shaft; and
a fluid receiving portion slidably inserting the contact connecting means thereto and gradually discharging a fluid charged in an inner portion thereof together with an upward movement of the contact connecting means at a time of a valve closing operation of the valve portion, thereby reducing a valve closing speed of the valve portion via the first transmission shaft.
In accordance with the present invention, since the extensible contact connecting means is provided between the upper end of the first transmission shaft and the lower end of the second transmission shaft, even when an extension due to a thermal expansion is generated in the first transmission shaft or the second transmission shaft, the contact connecting means is compressed so as to absorb the extension of the first transmission shaft and the second transmission shaft, whereby it is possible to maintain the contact connecting state between the first transmission shaft and the second transmission shaft.
In this case, when the movable plate is sucked by the upper electromagnet, the contact connecting means upward moves within the fluid receiving portion due to an urging force of the lower spring member via the first transmission shaft. At this time, since the fluid charged in an inner portion of the fluid receiving portion is gradually discharged, it is possible to prevent the first transmission shaft from suddenly moving via the contact connecting means due to a fluid discharge resistance. Accordingly, a displacement speed of the valve portion at a time of closing the valve can be sufficiently reduced, and it is possible to reduce a sound and a vibration generated at a time when the valve portion sits on the intake and exhaust port.
Further, when the first transmission shaft and the second transmission shaft move, the contact state between both of the shafts can be maintained via the contact connecting means, so that the collision between the upper end of the first transmission shaft and the lower end of the second transmission shaft can be reduced, and it is possible to reduce the sound and the vibration generated between both of the shafts.
Further, in the shock absorbing means, since the structure is made such that the contact connecting means is inward inserted within the fluid receiving portion, it is possible to form the shock absorbing means which can achieve both of an extension absorption and shock absorption of the first transmission shaft and the second transmission shaft, and a shock absorption at a time of closing the valve portion, in a compact manner.
In accordance with one aspect of the present invention, the contact connecting means comprises:
a cylindrical overcoat member having an upper portion closed by a contact wall brought into contact with a lowe
Abe Kenji
Ikoma Kouichi
Onohara Yoshinori
Umemoto Atsushi
Honda Giken Kogyo Kabushiki Kaisha
Lahive & Cockfield LLP
Lo Weilun
LandOfFree
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