JP2000303811A - Electromagnetic driven valve and internal combustion engine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb difference in thermal expansion caused by the change of circumferential temperature and the like, of an intake valve and an exhaust valve, and reduce noise, the power consumption and the manufacturing cost by regulating the materials and the axial lengths of a cylinder head, a housing, a valve body and a shaft part. SOLUTION: An electromagnetic driven valve 1 for driving the intake and exhaust valves and the like of an engine comprises a valve body 20 axially vertically moved by a stem 21, extending into a spring accommodating chamber 12 in a cylinder head 10. An electromagnetic actuator 50 driving an armature 40 is disposed in the housing 30 installed in the cylinder head 10. In this case, the materials and the axial lengths of the members 10, 20, 30, 42 are regulated so that the total sum of the thermal expansion in the valve body axial direction within a prescribed temperature range of the valve body 20 and a shaft part 42, and the total sum of the similar thermal expansion in a prescribed temperature range of the cylinder head 10 and the housing 30 are substantially equal to one another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically driven valve device and an internal combustion engine using the same (hereinafter, the internal combustion engine is referred to as "engine").

[0002]

2. Description of the Related Art Conventionally, there has been known an electromagnetically driven valve device that drives an intake valve or an exhaust valve of an engine by an electromagnetic attraction generated in an electromagnetic coil.

As an example of a conventional electromagnetically driven valve device, an electromagnetically driven valve device 100 as shown in FIG.
1 and when the lower coil 102 is not energized,
As shown in FIG. 5, the valve body 103 is located in the middle of the drive range between the open state and the closed state. When the upper coil 101 is energized, the armature 104 as a mover
Is sucked upward in FIG. 5, and the valve body 10
3 is moved upward in FIG. 5 by the urging force of the spring 105, seats on the valve seat 106 and closes the valve. On the other hand, the lower coil 10
When the power is supplied to the armature 2, the armature 104 is sucked downward in FIG.
5 is pushed down by the armature shaft 104a in FIG. 5 to open the valve.

In such an electromagnetically driven valve device, opening / closing timing of an intake valve or an exhaust valve can be easily controlled as compared with a conventional cam driven valve device. Therefore, by controlling the opening / closing timing of the intake valve or exhaust valve so that intake or exhaust is performed satisfactorily in accordance with the operating conditions of the engine, improvement of engine operation stability, improvement of fuel efficiency, or reduction of exhaust emissions It is possible to

[0005]

However, the electromagnetically driven valve device has many problems to be solved, such as noise when the valve body is seated, reliability of valve operation, power consumption, and cost. In particular, thermal expansion of each member due to heat generated during operation of the engine greatly affects seating noise, valve operation reliability, and power consumption.

In the case of an engine using a conventional cam driven valve device, thermal expansion occurs as in the case of an electromagnetically driven valve device. However, by devising a cam lift shape at the time of a cam lift, for example, seating noise due to thermal expansion is reduced. I was For example, in the case of an electromagnetically driven valve device 100 as shown in FIG. 5, an aluminum die-cast is used for a housing 109 that houses a cylinder head 107 and an electromagnetic actuator 108, and an iron-based alloy steel is used for a valve body 103 and an armature shaft 104a. I have. In the electromagnetically driven valve device 100 shown in FIG. 5, the cylinder head 107, the housing 109, the valve body 103, and the armature shaft 104a are generated by the heat generated during the operation of the engine as described above.
Respectively thermally expand.

Although a predetermined clearance (hereinafter referred to as "armature clearance") is provided between the armature 104 and the upper core 110 when the electromagnetically driven valve device 100 as shown in FIG. 5 is closed, a cylinder is provided. Head 107, housing 109, valve body 103,
Since the amount of heat expansion of the armature shaft 104a differs from that of the armature shaft 104a, the armature clearance changes depending on the ambient temperature during operation of the engine. For example, the change width of the armature clearance is about 150 μm. Thermal expansion of the cylinder head 107, the housing 109, the valve body 103, and the armature shaft 104a causes, for example, the following problems.

FIG. 6 shows that the armature clearance is 20
FIG. 7 shows an operation simulation of the electromagnetically driven valve device when the armature clearance is 150 μm, and FIG. 7 shows an operation simulation of the electromagnetically driven valve device when the armature clearance is 150 μm. When the armature clearance changes as shown in FIGS. 6 and 7 due to the thermal expansion of each member, it is necessary to control the magnitude and timing of the voltage applied to the coil to control the seating speed of the valve body. Therefore, detection means for detecting the armature clearance, and means for determining the magnitude and timing of the voltage applied to the coil based on the detected armature clearance are required, which may increase the cost of the electromagnetically driven valve device. I am concerned.

[0009] Armature clearance is 150 μm
7, the armature collides with the core after the valve is seated on the valve seat as shown in FIG. 7, and the seating sound of the valve and the collision sound between the armature and the core are generated, which may increase the engine noise. is there.

When the urging force of the spring is increased,
The armature shaft of the armature and the stem end of the valve body can be prevented from separating from each other, and the armature can be prevented from colliding with the core after the valve is seated. However, when the biasing force of the spring is increased, it is necessary to hold the armature by electromagnetic force at a position away from the core by the clearance in order to maintain the valve in the closed position, and the coil is consumed. Power increases.

In order to solve the above-mentioned problems, it is necessary to reduce the amount of change in clearance due to temperature change as much as possible, and to reduce the influence of thermal expansion. As a method of reducing the influence of thermal expansion, it is conceivable that the cylinder head, the housing, the valve body, the armature shaft and the like are made of a material having a small thermal expansion coefficient and a high strength, such as titanium. However, since titanium and the like are expensive, there is a problem that the manufacturing cost of the electromagnetically driven valve device increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an electromagnetically driven valve device which can reduce the influence of thermal expansion at low cost and an engine using the same. is there.

[0013]

According to the electromagnetically driven valve device of the first aspect of the present invention, the cylinder head, the housing, the valve body, and the shaft are defined by defining the material and the length of the valve body in the axial direction. Even if thermal expansion is caused by a temperature change or temperature distribution around the intake valve or the exhaust valve, the difference in the expansion amount of each member can be absorbed, so that the total expansion amount of the cylinder head and housing, the valve body and the shaft The difference from the sum of the expansion amounts of the portions can be made substantially equal. Therefore,
The influence on the electromagnetically driven valve device due to thermal expansion such as generation of noise, increase in power consumption, and increase in manufacturing cost can be reduced. In addition, for example, aluminum die-cast, industrial ceramics, alloy steel, or the like can be used as the material of the cylinder head, the housing, the valve body, and the shaft, so that an increase in manufacturing cost can be suppressed.

According to the electromagnetically driven valve device of the second aspect of the present invention, the electromagnetic actuator can move together with the housing. Therefore, the electromagnetic actuator can move in the axial direction of the valve body together with the movement due to the thermal expansion of the housing. Therefore, not only the housing but also the electromagnetic actuator moves, so that the influence of the thermal expansion on the electromagnetically driven valve device can be reduced.

According to the engine of the third aspect of the present invention, the intake valve and the exhaust valve of the electromagnetically driven valve device can be formed of a valve body, a shaft and a housing made of materials having different expansion rates. Therefore, the influence of thermal expansion can be reduced in accordance with the temperature change or temperature distribution around the intake or exhaust valve of the engine.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 is a sectional view showing an electromagnetically driven valve device according to a first embodiment of the present invention. In the first embodiment, since the structures of the intake valve and the exhaust valve of the electromagnetically driven valve device are almost the same, the structure of the intake valve will be described.

As shown in FIG. 1, the electromagnetically driven valve device 1 comprises a cylinder head 10, a valve body 20, a housing 3
0, an armature 40 as a mover, an electromagnetic actuator 50, and the like. Valve body 20
Is controlled to open and close the intake port 11 for supplying air or air-fuel mixture to the combustion chamber 60 of the engine at a predetermined timing. The valve body 20 includes the cylinder head 1
The shaft 21 moves vertically in the axial direction by a stem 21 extending toward the spring accommodation chamber 12 formed at zero. Further, the valve body 20 is slidably housed in the cylinder head 10 by a valve guide 13 for guiding movement in the axial direction. The valve body 20 has an umbrella portion 22 that can be seated on the valve seat 14 provided on the cylinder head 10 at an end of the stem 21 on the combustion chamber 60 side.

A spring 15 and a spring seat 16 are accommodated in the spring accommodating chamber 12. The end of the spring 15 on the side opposite to the combustion chamber is in contact with the spring seat 16, and the other end is the inner bottom surface 12 of the spring housing chamber 12.
a. The spring seat 16 is the valve body 2
The spring 15 urges the valve body 20 upward in FIG. 1, that is, in the valve-closing direction, since it is fixed to the end of the stem 21.

The housing 30 has a substantially cylindrical shape and houses an electromagnetic actuator 50 for driving the armature 40 therein. A housing head 31 is provided above the housing 30. The housing 30 and the housing head 31 are fixed above the cylinder head 10 by bolts 32.

The electromagnetic actuator 50 housed inside the housing 30 includes an upper core 51 having an upper coil 511 and a lower core 5 having a lower coil 521.
2, a lower plate 53 provided on the combustion chamber side of the lower core 52, and a stopper 54 provided between the upper core 51 and the lower core 52. The electromagnetic actuator 50 composed of these members is
, And a slight clearance is provided between the lower plate 53 of the electromagnetic actuator 50 and the cylinder head 10. Therefore, the housing 30
The electromagnetic actuator 50 moves together with the housing 30 in the vertical direction in FIG.

The armature 40 comprises an armature main body 41 and an armature shaft 42 as a shaft. The armature body 41 is disposed between the upper core 51 and the lower core 52, has a disk shape, and is made of a magnetic material such as iron. One end of the armature shaft 42 is fitted and joined to a substantially central portion of the armature main body 41. Armature shaft 4
The end on the combustion chamber side of No. 2 can be in contact with and separated from the end of the stem 21 of the valve body 20 via the shaft cap 43.

The upper coil 5 of the electromagnetic actuator 50
When an electric current is applied to the arm 11, an electromagnetic attraction force is generated in the upper core 51, and the armature body 41 is attracted upward in FIG. 1 to separate the armature shaft 42 from the end of the stem 21 of the valve body 20. When the lower coil 521 is energized, an electromagnetic attractive force is generated in the lower core 52, and the armature main body 41 is attracted downward in FIG. 1 to bring the armature shaft 42 into contact with the end of the stem 21.

The stopper 54 disposed between the upper core 51 and the lower core 52 regulates the amount of movement of the armature 40 by its own thickness. Armature body 41
The shaft 44 provided on the side opposite to the combustion chamber has a flange portion 45 at the end on the side opposite to the combustion chamber. Shaft 4
The end on the combustion chamber side of No. 4 can be in contact with and separated from the end of the armature shaft 42 on the side opposite to the combustion chamber.

A spring cap 33 is fitted and fixed to the end of the housing head 31 on the side opposite to the combustion chamber. The spring cap 33 has a bottomed cylindrical shape, and the inside of the spring cap 33 is a spring accommodating chamber 34. A spring 35 and a flange portion 45 of a shaft 44 are housed in the spring housing chamber 34. The spring 35 is disposed opposite the spring 15 with the armature 40 interposed therebetween. The end of the spring 35 on the side opposite to the combustion chamber is in contact with the inner bottom surface 33 a of the spring cap 33, and the end on the side of the combustion chamber is in contact with the flange 45 of the shaft 44. Therefore, the spring 35 urges the shaft 44 in a direction in which the shaft 44 and the armature shaft 42 come into contact with each other, and also urges the shaft 44 in a direction in which the armature shaft 42 and the stem 21 come into contact with each other. 1
In the downward direction, that is, in the valve opening direction.

In the electromagnetically driven valve device 1 having the above structure, when the upper coil 511 and the lower coil 521 are not energized, the spring 15 and the spring 35 are set so that the armature main body 41 is located substantially in the middle between the upper core 51 and the lower core 52. The load has been adjusted. When the upper coil 511 and the lower coil 521 are not energized, the valve body 20 is in a half-open state as shown in FIG. 1. During operation of the engine, the upper coil 511 and the lower coil 521 are energized alternately to close the valve and open the valve. Repeat with the state.

Next, the thermal expansion of the intake valve of the electromagnetically driven valve device 1 will be described in detail. The temperature distribution around the intake valve is more uniform than that around the exhaust valve exposed to high-temperature exhaust gas, and the temperature change between when the engine is cold and when it is hot is small. Therefore, the thermal expansion of each member constituting the intake valve of the electromagnetically driven valve device 1 is moderate, and the expansion amount of each member is small.

FIG. 2 shows a change in valve clearance with respect to the temperature of engine cooling oil. The valve clearance is a gap between the shaft cap 43 provided at the tip of the armature shaft 42 and the end of the stem 21 of the valve body 20. This valve clearance changes as shown in FIG. 2 according to the temperature of the engine cooling oil, that is, the temperature change around the intake valve of the electromagnetically driven valve device 1.

As shown in FIG. 2, the valve clearance of the conventional intake valve increases as the temperature of the cooling oil increases. This is for the following reasons. Since the temperature distribution around the intake valve is uniform, the temperature changes of the cylinder head, the housing, the valve body, and the armature shaft constituting the intake valve are almost the same. As a result, the expansion amount of the cylinder head and the housing in which the aluminum die cast having a large expansion coefficient is used as the material increases, and the expansion amount of the valve body and the armature shaft in which the austenitic alloy steel is used as the material decreases. .

In the case of the intake valve of the electromagnetically driven valve device 1 of the first embodiment as described above, the material of the cylinder head 10 is an aluminum die-cast. The material of the housing 30 is industrial ceramics, and the material of the valve body 20 and the armature shaft 42 is austenitic alloy steel.

The coefficient of thermal expansion of each material is as follows. Aluminum die cast: Ka = 2.1 × 10 ⁻⁵ (1 / K) Industrial ceramics: Kc = 2.6 × 10 ⁻⁶ (1 / K) Austenitic alloy steel: Kau = 1.73 × 10 ⁻⁵ ( 1 / K)

Also, as shown in FIG.
If the length of the valve body in the axial direction of 0 is a, the length of the housing 30 is similarly b, the length of the valve body 20 is c, and the length of the armature shaft 42 is d, a
b, c, and d are respectively as follows. Cylinder head: a = 107.5 mm Housing: b = 31.0 mm Valve body: c = 98.5 mm Armature shaft: d = 40.0 mm

Based on the above numerical values, the sum of the thermal expansion amounts of the cylinder head 10 and the housing 30 and the valve body 20 and the armature shaft 4
The difference D from the sum of the thermal expansion amounts of No. 2 can be obtained.

D = {(a × Ka + b × Kc) − (c × Kau + d × Kau)} × Δt Here, Δt indicates a temperature difference between when the engine is at a low temperature and when the engine is at a high temperature. Assuming that the temperature change around the intake valve of the electromagnetically driven valve device 1 is 150 ° C., the difference D in this embodiment is
₁ is D ₁ = −0.0087 mm = −8.7 μm.

Here, as a comparative example, the expansion amount due to a temperature change of an intake valve used in a conventional engine is shown. In the intake valve of the conventional engine, aluminum die-cast is used as the material of the cylinder head as in this embodiment, and aluminum die-cast is also used as the material of the housing. Martensitic alloy steel is used as the material of the valve body. The expansion rate of each material, the length of the cylinder head, the housing, and the length of the valve body, and the temperature change around the intake valve are the same as those in the first embodiment,
Assuming that a = 120 mm, b = d = 0 mm, and the coefficient of thermal expansion of the martensitic alloy steel is 9.9 × 10 ⁻⁶ (1 / K), the difference D in the conventional intake valve as a comparative example is obtained from the equation.
₂ is D ₂ = 0.232 mm = 232 μm.

That is, in the first embodiment, by defining the materials and dimensions of the cylinder head, the housing, the valve body, and the armature shaft, the amount of thermal expansion of the cylinder head and the housing and the amount of thermal expansion of the valve body and the armature shaft are determined. The difference from the conventional engine can be made very small. As a result, as shown in FIG. 2, a change in the valve clearance with respect to the temperature of the cooling oil can be reduced.

When the difference in the amount of thermal expansion decreases, the change in the armature clearance provided between the armature 40 and the upper core 51 decreases. As shown in FIG. 6, in the operation simulation when the armature clearance is 20 μm, since the seating of the valve body 20 and the seating of the armature 40 occur simultaneously, the seating speed of the armature 40 is controlled by changing the voltage application timing. The sitting noise can be reduced. As shown in FIG. 7, when the armature clearance is 150 μm, the seating of the armature 40 occurs after the valve body 20 is seated, so that the seating sound of the armature 40 cannot be suppressed. Therefore, by reducing the difference in the amount of thermal expansion, the change in the armature clearance is reduced, so that the seating noise of the valve body 20 and the armature 40 can be reduced.

By combining materials and dimensions different from those of the first embodiment, the difference between the thermal expansion of the cylinder head and the housing and the thermal expansion of the valve body and the armature shaft is made substantially zero. Is possible.

Next, the exhaust valve will be described. The exhaust valve of the electromagnetically driven valve device according to the first embodiment of the present invention has substantially the same structure as the intake valve of the electromagnetically driven valve device shown in FIG. Therefore, description of the structure of the exhaust valve will be omitted. Since the periphery of the exhaust valve is exposed to the burned high-temperature exhaust gas, the temperature change is larger than that around the intake valve. In particular, the valve body 20, which is exposed to high-temperature exhaust gas,
The amount of thermal expansion is larger than that of the cylinder head 10 or the housing 30.

FIG. 3 shows the change in the valve clearance described for the intake valve with respect to the temperature of the exhaust gas.
As shown in FIG. 3, in the conventional exhaust valve, the amount of thermal expansion of the valve body 20 exposed to exhaust gas having a higher temperature than the amount of expansion of a cylinder head or a housing made of aluminum die-cast having a large expansion coefficient is used. As the exhaust gas temperature increases, the valve clearance decreases.

Therefore, the materials and dimensions of the cylinder head 10, the housing 30, the valve body 20, and the armature shaft 42 are specified so that the amount of thermal expansion of the valve body 20 can be absorbed by the cylinder head 10 and the housing 30. There is a need. However, it is difficult to change the material of the cylinder head 10 between the intake valve side and the exhaust valve side.

Therefore, the exhaust valve of the first embodiment uses aluminum die-cast as the material of the cylinder head 10 in the same manner as the intake valve. As the material of the housing 30 of the exhaust valve, an aluminum die-cast having a large coefficient of thermal expansion is used similarly to the cylinder head 10. The material of the valve body 20 is an austenitic alloy steel that can withstand high-temperature exhaust gas, and the material of the armature shaft 42 is a martensitic alloy steel.

In the exhaust valve, an aluminum die-cast having a large thermal expansion coefficient is used as a material of the housing 30 and a martensitic alloy steel having a small thermal expansion coefficient is used as a material of the armature shaft 42. The effects can be absorbed and offset. As a result, as shown in FIG. 3, a change in the valve clearance with respect to the temperature of the exhaust gas can be reduced.

As described above, according to the electromagnetically driven valve device of the first embodiment, the cylinder head 10 and the housing 3
0, valve body 20, and armature shaft 4
By combining the two materials and dimensions, it is possible to make the difference between the thermal expansion of the cylinder head 10 and the housing 30 and the thermal expansion of the valve body 20 and the armature shaft 42 substantially zero in the steady state. is there. Therefore, the influence on the electromagnetically driven valve device, such as generation of noise due to thermal expansion, increase in power consumption, and increase in manufacturing cost, can be reduced. As described above, since aluminum die-casting, industrial ceramics, or alloy steel can be used, an increase in manufacturing cost can be suppressed.

Further, the electromagnetic actuator 50 housed inside the housing 30 can move in the axial direction of the valve body together with the housing 30 due to the thermal expansion of the housing 30. Therefore, the amount of thermal expansion of the valve body 20 and the armature shaft 42 can be absorbed by the cylinder head 10 and the housing 30, so that the effect of the thermal expansion on the electromagnetically driven valve device can be reduced.

Further, since the materials and dimensions of the housing 30, the valve body 20, and the armature shaft 42 of the intake valve and the exhaust valve of the electromagnetically driven valve device can be changed, the ambient temperature change or temperature distribution can be changed. Accordingly, the intake valve and the exhaust valve can each reduce the influence of thermal expansion. Therefore, an engine in which the influence of thermal expansion on the intake valve and the exhaust valve is reduced can be obtained.

In this embodiment, the material of the valve bodies 20 of the intake valve and the exhaust valve is the same, but the material of the valve body of the exhaust valve which is greatly affected by heat may be changed to titanium or the like.

(Second Embodiment) FIG. 4 shows an electromagnetically driven valve device according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals. First
As in the embodiment, the structures of the intake valve and the exhaust valve of the electromagnetically driven valve device are almost the same, so only the intake valve will be described.

As shown in FIG. 4, the arrangement of the springs of the intake valve of the electromagnetically driven valve device 2 of the second embodiment is different. Inside the cylinder head 10, a spring housing chamber 71 and a spring housing chamber 72 are provided continuously in the axial direction of the valve body. The spring accommodating chamber 72 is formed so as to have a larger inner diameter than the spring accommodating chamber 71.

The spring chamber 71 contains the spring 7
3 are accommodated. The end of the spring 73 on the combustion chamber 60 side contacts the inner bottom 71 a of the spring storage chamber 71,
The other end is in contact with a spring seat 75 provided at the end of the valve body 20 opposite the combustion chamber. Spring 7
Numeral 3 urges the valve body 20 upward in FIG. 4, that is, in the valve closing direction.

The spring chamber 72 has a spring 7
4 are accommodated. The end of the spring 74 on the combustion chamber side is connected to a spring seat 4 provided on the armature shaft 42.
6 and the other end thereof contacts a spring seat 76 provided on the combustion chamber side of the lower core 52. The spring 74 urges the armature shaft 42 downward in FIG. 4, that is, the valve body 20 in the valve opening direction. The armature shaft 42 is held by the lower core 52 via a shaft guide 55 so as to be slidable in the vertical direction in FIG.

Also in the second embodiment, by combining the materials and dimensions of the cylinder head 70, the housing 30, the valve body 20, and the armature shaft 42, the amount of thermal expansion of the cylinder head 70 and the housing 30, the valve body 20 and the armature Shaft 42
Can be made substantially zero. Therefore, the influence of the thermal expansion on the electromagnetically driven valve device can be reduced.

The electromagnetic actuator 50 housed inside the housing 30 can move in the axial direction of the valve body together with the housing 30 due to the thermal expansion of the housing 30. Therefore, since the amount of thermal expansion of the valve body 20 and the armature shaft 42 can be absorbed by the cylinder head 70 and the housing 30, the influence of the thermal expansion on the electromagnetically driven valve device can be reduced.

Further, in the second embodiment, there is no need to provide a spring accommodating chamber 34 above the housing 30 as shown in FIG. 1 of the first embodiment. Therefore, the physical size of the electromagnetically driven valve device can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an intake valve of an electromagnetically driven valve device according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a valve clearance of an intake valve with respect to a temperature of cooling oil.

FIG. 3 is a characteristic diagram showing a valve clearance of an exhaust valve with respect to an exhaust temperature.

FIG. 4 is a sectional view showing an intake valve of an electromagnetically driven valve device according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing an example of a conventional electromagnetically driven valve device.

FIG. 6 is a characteristic diagram obtained by an operation simulation of the electromagnetically driven valve device, and is a characteristic diagram obtained by an operation simulation when the clearance between the armature and the core is 20 μm.

FIG. 7 is a characteristic diagram obtained by an operation simulation of the electromagnetically driven valve device, and is a characteristic diagram obtained by an operation simulation when the clearance between the armature and the core is 150 μm.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electromagnetically driven valve device 2 electromagnetically driven valve device 10 cylinder head 20 valve body 21 stem 30 housing 40 armature (movable element) 42 armature shaft (shaft) 50 electromagnetic actuator 70 cylinder head

Claims (3)

[Claims] 1. An electromagnetically driven valve device for driving an intake valve or an exhaust valve of an internal combustion engine by electromagnetic force, wherein the electromagnetically driven valve device is capable of contacting a stem end of a valve body of the intake valve or the exhaust valve and being separated from the stem end. A mover having a shaft portion provided so as to be able to move, a cylinder head in which the valve body is housed so as to be movable in an axial direction; an electromagnetic actuator capable of driving the mover; and an electromagnetic actuator housed therein. A total sum of thermal expansion amounts of the valve body and the shaft portion in a predetermined temperature range in the valve body axial direction, and heat of the cylinder head and the housing in a predetermined temperature range in the valve body axial direction. The valve body, the shaft portion, and the Linda head, and the electromagnetic valve device, characterized in that the material and the valve body axial length of the housing is defined respectively. 2. The apparatus according to claim 1, wherein the electromagnetic actuator is movable together with the housing.
The electromagnetically driven valve device according to claim 1. 3. An internal combustion engine comprising the electromagnetically driven valve device according to claim 1 or 2, wherein a valve body of an intake valve and a valve body of an exhaust valve, a shaft portion of an intake valve and a shaft portion of an exhaust valve, and intake air. An internal combustion engine, wherein at least one set of a valve housing and an exhaust valve housing is formed of materials having different expansion coefficients.