JP2013104409A - Heating device for engine valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device for an engine valve which can secure reliability while saving the number of wirings.SOLUTION: The heating device 100A for the engine valve includes: a piezoelectric element 2, which is a power generator; a weight 3, which is an acting portion prompting the piezoelectric element 2 to generate power; and heating element 4, which is a heating portion generating heat depending on power supplied from the piezoelectric element 2. The heating device 100A for the engine valve is provided in the engine valve 1A having the piezoelectric element 2, the weight 3, an the heating element 4 provided in the combustion chamber of the internal combustion engine. The heating device 100A for the engine valve further includes a switch 5, which is a control portion for controlling the power supply from the piezoelectric element 2 to the heating element 4 depending on a temperature. The switch 5 is provided in the engine valve 1A, making the piezoelectric element 2 and the heating element 4 electrically contactless when the temperature is higher than the prescribed one.

Description

  The present invention relates to an engine valve heating device for heating an engine valve provided for a combustion chamber of an internal combustion engine.

  In an internal combustion engine, an engine valve (intake valve or exhaust valve) provided for the combustion chamber may be heated. In Patent Document 1, an intake valve device for an internal combustion engine is provided with a heating mechanism that directly heats an umbrella part of the intake valve, and the heating mechanism includes a heating element that generates heat by power supply from a power source inside the umbrella part. Is disclosed. The intake valve device of the internal combustion engine is provided with a heating mechanism so as to prevent a decrease in startability at a low temperature start in an internal combustion engine to which a mixed liquid of gasoline and alcohol fuel is supplied as fuel.

JP 2010-121475 A

  In heating the engine valve of the internal combustion engine, for example, a heat generating portion can be provided in the engine valve as in the intake valve device of the internal combustion engine disclosed in Patent Document 1. And in generating heat with a heat generating part, electric power can be supplied, for example from an external power supply. In this case, however, the connection between the external power source and the heat generating part is cut off when the engine valve is driven, which may cause unstable heating.

  Specifically, in order to connect the external power source and the heat generating portion, for example, it is conceivable to provide electrodes corresponding to each other on the stem portion and the valve guide of the engine valve. However, in this case, there is a possibility that the heating becomes unstable as a result of the contact between the electrodes becoming unstable due to the swing of the engine valve. Alternatively, forcibly bringing the engine valve into contact with the valve guide may promote wear of the engine valve instead of ensuring the stability of heating. For this reason, in this case, there is a possibility that high reliability cannot be ensured. In addition, when an external power source is used to supply power to the heat generating portion, there is a risk that the length of wiring becomes disadvantageous in terms of cost and weight.

  In view of the above problems, an object of the present invention is to provide a heating device for an engine valve capable of ensuring reliability while reducing wiring.

  The present invention includes a power generation unit, an operation unit that operates to generate power with respect to the power generation unit, and a heat generation unit that generates heat according to electric power supplied from the power generation unit. Of the engine valve and the heat generating part, at least the power generating part and the heat generating part are provided in an engine valve provided for a combustion chamber of an internal combustion engine, or an engine valve heating device provided in a peripheral part of the engine valve It is.

  The present invention may further include a control unit that controls supply of electric power from the power generation unit to the heat generation unit according to temperature.

  In the present invention, the power generation unit, the heat generation unit, and the control unit are provided in the engine valve, and the control unit controls the supply of power from the power generation unit to the heat generation unit according to the temperature. When the temperature is lower than a predetermined value, the power generation unit and the heat generation unit are electrically connected, and when the temperature is higher than the predetermined value, the power generation unit and the previous heat generation unit are electrically disconnected. It can be.

  According to the present invention, reliability can be ensured while reducing wiring.

It is a figure which shows the heating apparatus of the engine valve of Example 1. FIG. 1 is an exploded view of an engine valve according to Embodiment 1. FIG. FIG. 6 is an operation explanatory diagram of the first embodiment. FIG. 6 is a diagram illustrating a modified example of the first embodiment. It is a figure which shows the heating apparatus of the engine valve of Example 2. FIG. FIG. 6 is an operation explanatory diagram of Embodiment 2. It is a figure which shows the heating apparatus of the engine valve of Example 3. FIG. FIG. 9 is an operation explanatory diagram of Embodiment 3. It is a figure which shows the heating apparatus of the engine valve of Example 4. FIG. FIG. 10 is a diagram showing a modification of the fourth embodiment. It is a figure which shows the heating apparatus of the engine valve of Example 5. FIG. FIG. 10 is a diagram showing a modification of the fifth embodiment.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an engine valve heating device (hereinafter referred to as a heating device) 100A. The heating device 100A is provided in the engine valve 1A. The engine valve 1A is an intake valve or an exhaust valve (in this case, an intake valve) provided for a combustion chamber of the internal combustion engine, and includes a piezoelectric element 2, a weight 3, a heating element 4, a switch 5, and a plug 6. As a result, a heating device 100A including the piezoelectric element 2, the weight 3, the heating element 4, and the switch 5 is provided in the engine valve 1A.

  The engine valve 1A includes an umbrella portion U and a stem portion S. A hollow portion R is provided. The hollow portion R is provided from the end portion of the umbrella portion U to the stem portion S. The piezoelectric element 2 is provided at the end portion on the umbrella portion U side of the portion extending along the stem portion S in the hollow portion R. The piezoelectric element 2 serves as a power generation unit that generates power by generating power in accordance with the acting load. The weight 3 is movably provided in a portion of the hollow portion R that extends along the stem portion S. The weight 3 moves in the hollow portion R according to the driving of the engine valve 1A. The weight 3 serves as an action portion that acts to generate electric power on the piezoelectric element 2 by colliding with the piezoelectric element 2.

  The heating element 4 is provided in a portion of the hollow portion R corresponding to the slope portion of the umbrella portion U. The heating element 4 is connected to the piezoelectric element 2 by wiring. The heat generating element 4 is a heat generating portion that generates heat by generating heat according to the electric power supplied from the piezoelectric element 2. Specifically, the heating element 4 is, for example, a resistor or a coil. The heating element 4 may be, for example, a heating electrode that generates heat by heat radiation between the electrodes, or a resistor such as nichrome, titanium, ceramic, or bismuth. The switch 5 is provided in a portion formed in the umbrella portion U of the hollow portion R. The switch 5 is provided so as to be interposed in a wiring connecting the piezoelectric element 2 and the heating element 4.

  The switch 5 is a temperature sensitive switch. The switch 5 is turned on when the temperature is lower than a predetermined value (specifically, when the temperature is equal to or lower than the predetermined value), and electrically connects the piezoelectric element 2 and the heat generating element 4. Further, when the temperature is higher than a predetermined value, it is turned OFF, and the piezoelectric element 2 and the heating element 4 are not electrically connected. And thereby, the control part which controls supply of electric power from the piezoelectric element 2 to the heat generating element 4 and supply stop according to the temperature by switching the electrical connection between the piezoelectric element 2 and the heat generating element 4 according to the temperature. It has become. The plug 6 is provided in an opening of the hollow portion R that is open at the end of the umbrella portion U.

  FIG. 2 is an exploded view of the engine valve 1A. As shown in FIG. 2, the heat generating element 4 and the switch 5 are specifically integrated in advance as a subunit SU that is a combination product with wiring. The heat generating element 4, the switch 5, and the wiring are insulated from the base member B of the subunit SU and the engine valve 1 </ b> A, for example, by providing a covering or a gap.

  The engine valve 1A can be assembled by assembling the subunit SU after assembling the weight 3 and the piezoelectric element 2 in the hollow portion R, and then assembling the plug 6. In the engine valve 1A assembled in this manner, the hollow portion R forms a space in which the weight 3 is movably accommodated in a portion extending along the stem portion S.

  FIG. 3 is an operation explanatory view of the heating device 100A. FIG. 3A shows the engine valve 1A when the valve is closed. FIG. 3B shows the engine valve 1A when the valve is opened. The engine valve 1A is provided in the cylinder head 20 of the internal combustion engine corresponding to the state of use. In the heating device 100A, the weight 3 collides with the piezoelectric element 2 due to inertia when the engine valve 1A is closed, and moves away from the piezoelectric element 2 when the engine valve 1A is opened. When the weight 3 collides with the piezoelectric element 2, the piezoelectric element 2 generates electric power, and the generated electric power is supplied from the piezoelectric element 2 to the heating element 4, whereby the heating element 4 generates heat. As a result, the engine valve 1A is heated. The switch 5 is turned off when the temperature is higher than a predetermined value, thereby stopping the power supply to the heating element 4 at a high temperature.

  Next, the effect of the heating device 100A will be described. The heating device 100A includes the piezoelectric element 2, the weight 3 and the heating element 4, and the piezoelectric element 2, the weight 3 and the heating element 4 are provided in the engine valve 1A. For this reason, the heating device 100A can enable self-power generation and self-heating of the engine valve 1A. And by making an external power supply unnecessary by this, the fall of the reliability which may generate | occur | produce when supplying electric power from an external power supply can be avoided. Moreover, wiring can be reduced by eliminating the need for an external power supply. For this reason, the heating device 100A can ensure reliability while reducing wiring.

  The heating device 100A can also enable temperature management by including a switch 5 that controls supply and stop of power supply from the piezoelectric element 2 to the heating element 4 according to temperature. Thereby, it is possible to prevent the engine valve 1A from becoming an abnormally high temperature. As a result, higher reliability can be secured. Specifically, the heating device 100A electrically connects the piezoelectric element 2 and the heat generating element 4 when the temperature is lower than a predetermined value, and generates heat when the temperature is higher than the predetermined value. By providing the engine valve 1A with the switch 5 that is not electrically connected to the element 4, the self-temperature management of the engine valve 1A can be performed.

  For example, the heating device 100A may be modified as follows. FIG. 4 is a view showing a heating device 100A ′, which is a modification of the heating device 100A. FIG. 4A shows the heating device 100A ′ when the engine valve 1A ′ is closed. FIG. 4B shows the heating device 100A ′ when the engine valve 1A ′ is opened. The engine valve 1A ′ and the heating device 100A ′ are provided with the engine valve 1A and the heating except that the piezoelectric element 2 capable of supplying power to the heating element 4 is further provided at the end of the hollow portion R opposite to the umbrella portion U. It is substantially the same as the device 100A. In the heating device 100A ′, power is generated by the weight 3 colliding with the piezoelectric element 2 when the engine valve 1A ′ is closed and opened. For this reason, heating apparatus 100A 'can improve heating performance by further increasing the power generation capacity as compared with heating apparatus 100A.

  FIG. 5 shows the heating device 100B. The engine valve 1B and the heating device 100B are substantially the same as the engine valve 1A and the heating device 100A except that a dielectric elastomer 7 is provided instead of the piezoelectric element 2 as a power generation unit and a weight 3 'is provided instead of the weight 3 as an action unit. Are identical. The dielectric elastomer 7 is provided at an end portion of the hollow portion R on the umbrella portion U side that extends along the stem portion S. The weight 3 ′ is provided in the hollow portion R in a state of being fixed to the dielectric elastomer 7 from the side opposite to the umbrella portion U. The weight 3 ′ acts to generate power for the dielectric elastomer 7 by expanding and contracting the dielectric elastomer 7.

  FIG. 6 is an operation explanatory diagram of the heating device 100B. FIG. 6A shows the heating device 100B when the engine valve 1B is closed. FIG. 6B shows the heating device 100B when the engine valve 1B is opened. In the heating device 100B, the weight 3 'compresses the dielectric elastomer 7 when the engine valve 1B is closed due to inertia, and expands the dielectric elastomer 7 when the engine valve 1B is opened. The dielectric elastomer 7 expands and contracts to generate electric power, and the generated electric power is supplied from the dielectric elastomer 7 to the heat generating element 4 so that the heat generating element 4 generates heat. In the heating device 100B, the switch 5 controls the supply and stop of power supply from the dielectric elastomer 7 to the heating element 4 in the same manner as in the heating device 100A.

  Next, the effect of the heating device 100B will be described. The heating device 100B includes the dielectric elastomer 7, the weight 3 ', and the heating element 4, and the engine valve 1B can be self-generated and self-heated by providing the dielectric elastomer 7, the weight 3', and the heating element 4 in the engine valve 1B. To. Therefore, like the heating device 100A, the heating device 100B can ensure reliability while reducing wiring. The heating device 100B can also enable self-temperature management of the engine valve 1B by providing the engine valve 1B with a switch 5 that enables temperature control. And thereby, higher reliability can be ensured similarly to the heating apparatus 100A.

  FIG. 7 is a view showing a heating device 100C. The engine valve 1C and the heating device 100C include a coil 8 instead of the piezoelectric element 2 as a power generation part, a magnet 9 instead of the weight 3 as an action part, and a hollow part R ′ instead of the hollow part R. Except for the point provided, it is substantially the same as the engine valve 1A and the heating device 100A. The hollow portion R ′ is provided with a stepped portion extending along the stem portion S. The coil 8 is provided along the extending direction of the stem portion S. The magnet 9 is movably provided in a portion extending along the stem portion S and a portion having a reduced diameter in the hollow portion R ′. The magnet 9 acts so as to generate electricity with respect to the coil 8 by approaching and separating from the coil 8.

  In this respect, the coil 8 is provided concentrically with respect to a portion of the hollow portion R ′ that forms a space in which the magnet 9 is movably accommodated. Moreover, one end part is provided so that it may be located around the part which forms the space which accommodates the magnet 9 movably among hollow part R '. In providing the coil 8 in this way, a subunit SU further incorporating the coil 8 can be configured, and the subunit SU together with the subunit SU can be provided in the hollow portion R ′.

  FIG. 8 is an operation explanatory view of the heating device 100C. FIG. 8A shows the heating device 100C when the engine valve 1C is closed. FIG. 8B shows the heating device 100C when the engine valve 1C is opened. FIG. 8 shows the engine valve 1C together with the valve guide 21A provided in use with respect to the cylinder head 20 and the engine valve 1C. In the heating device 100C, the magnet 9 approaches and separates from the coil 8 when the engine valve 1C is driven due to inertia. As a result, the coil 8 generates electric power, and the generated electric power is supplied from the coil 8 to the heating element 4 so that the heating element 4 generates heat. In the heating device 100C, the switch 5 controls the supply and stop of power supply from the coil 8 to the heating element 4 in the same manner as in the heating device 100A.

  Next, the effect of the heating device 100C will be described. The heating device 100C includes the coil 8, the magnet 9 and the heating element 4, and the coil 8, the magnet 9 and the heating element 4 are provided in the engine valve 1C, thereby enabling self-power generation and self-heating of the engine valve 1C. For this reason, the heating device 100C can ensure reliability while reducing wiring, like the heating device 100A. The heating device 100C can also enable self-temperature management of the engine valve 1C by providing the engine valve 1C with a switch 5 that enables temperature management. And thereby, high reliability can be ensured more suitably like 100 A of heating apparatuses.

  FIG. 9 is a diagram showing a heating device 100D. The heating device 100D includes a coil 8 instead of the piezoelectric element 2 as a power generation unit, a valve guide 21B instead of the weight 3 as an action unit, and an ECU 30 instead of the switch 5 as a control unit, It is substantially the same as the heating device 100A. The engine valve 1D is substantially the same as the engine valve 1A except that the engine valve 1D includes a coil 8 instead of the piezoelectric element 2 and does not include a switch 5 in particular.

  The coil 8 is provided inside the stem portion S. The coil 8 is provided along the extending direction of the stem portion S. Thus, when providing the coil 8, the subunit SU which further incorporated the coil 8 can be comprised, and it can provide in the hollow part R with the subunit SU together.

  The valve guide 21B is provided for the engine valve 1D in use, and guides the operation of the engine valve 1D. The valve guide 21B is an electromagnet, and acts to generate power when the coil 8 that approaches and separates according to the driving of the engine valve 1D is energized. The ECU 30 is an electronic control unit, and is connected to the valve guide 21B so as to be energized. The ECU 30 controls the supply of electric power from the coil 8 to the heating element 4 and the supply stop by controlling the energization to the valve guide 21B.

  In the heating device 100D, when the engine valve 1D is driven, the coil 8 approaches and separates from the valve guide 21B when energized, whereby the coil 8 generates power. The generated electric power is supplied from the coil 8 to the heat generating element 4 so that the heat generating element 4 generates heat. When energizing the valve guide 21B, the ECU 30 controls energization to the valve guide 21B in accordance with the operating state of the corresponding internal combustion engine.

  In this regard, the ECU 30 specifically energizes the valve guide 21B when, for example, the cooling water temperature of the corresponding internal combustion engine is lower than a predetermined value (specifically, when the cooling water temperature is equal to or lower than the predetermined value), the coil 8 Therefore, electric power can be supplied to the heating element 4. In addition, when the coolant temperature is higher than the predetermined value, the supply of power from the coil 8 to the heating element 4 can be stopped by prohibiting the energization of the valve guide 21B.

  Next, the effect of the heating device 100D will be described. The heating device 100D includes the coil 8, the valve guide 21B, and the heat generating element 4, and the coil 8 and the heat generating element 4 out of the coil 8, the valve guide 21B, and the heat generating element 4 are provided in the engine valve 1D. Enables self-power generation and self-heating. That is, according to the heating device 100D, by providing the engine valve 1D with the power generation unit and the heat generation unit among the power generation unit, the action unit, and the heat generation unit, the engine valve 1D can perform self-power generation and self-heating. it can. As a result, like the heating device 100A, reliability can be ensured while reducing wiring.

  The heating device 100D enables power generation and heat generation when the coil 8 approaches and separates from the valve guide 21B when energized. On the other hand, in the heating device 100D, temperature management can be made possible by providing the ECU 30 that controls energization to the valve guide 21B. That is, according to the heating device 100D, temperature control can be performed even if the control unit is provided outside the engine valve 1D. And thereby, high reliability can be ensured more suitably like 100 A of heating apparatuses.

  For example, the heating device 100D may be modified as follows. FIG. 10 is a view showing a heating device 100D ′ which is a modification of the heating device 100D. The engine valve 1D ′ and the heating device 100D ′ have the engine valve 1D and the heating device 100D ′ except that the coil 8 is provided in a portion of the outer peripheral portion of the stem portion S that is positioned closer to the umbrella portion U than the valve guide 21B during driving. It is substantially the same as the heating device 100D. Thus, in the heating apparatus 100D ′ provided with the coil 8, the stem portion S becomes the core of the coil 8. For this reason, heating device 100D 'can obtain the same operation effect as heating device 100D, and can also raise power generation capability by raising electromotive force further compared with heating device 100D.

  FIG. 11 is a diagram showing the heating device 100E. The heating device 100E includes a piezoelectric element 2 'provided as shown below as a power generation unit. In addition, a valve spring 24 is provided as an action part, and a heating element 4 ′ provided as shown below is provided as a heating part. The engine valve 1E is not particularly provided with the configuration of the heating device 100E.

  For the engine valve 1E in use, a valve guide 21C, upper and lower valve spring seats 22, 23, and a valve spring 24 are provided. The valve guide 21C is not particularly an electromagnet. On the other hand, the heating element 4 'is provided in the valve guide 21C. Thus, the heating element 4 'is provided in the peripheral portion of the engine valve 1E. An appropriate metal can be applied to the material of the valve guide 21C.

  The valve spring seat 22 on the upper side is provided at the end of the stem portion S. The lower-side valve spring seat 23 is provided so as to be pressed against the cylinder head 20 via the piezoelectric element 2 ′. In this respect, the piezoelectric element 2 'is provided on the peripheral portion of the valve guide 21C so that the spring force of the valve spring 24 acts via the valve spring seat 23, and is thereby provided on the peripheral portion of the engine valve 1E. Yes. The piezoelectric element 2 'is connected to the heating element 4' by wiring. The valve spring 24 is provided between the valve spring seats 22 and 23 and urges the valve spring seat 22 in a direction to close the engine valve 1E. The valve spring 24 acts to generate electricity with respect to the piezoelectric element 2 ′ when compressed according to the drive of the engine valve 1 E.

  In the heating device 100E, when the valve spring 24 is compressed in accordance with the drive of the engine valve 1E, the spring force of the valve spring 24 acts on the piezoelectric element 2 ′, and the piezoelectric element 2 ′ generates electric power. Then, the generated electric power is supplied from the piezoelectric element 2 ′ to the heating element 4 ′, so that the heating element 4 ′ generates heat. The heating element 4 'indirectly heats the engine valve 1E by heating the valve guide 21C.

  Next, the effect of the heating device 100E will be described. The heating device 100E includes the piezoelectric element 2 ′, the valve spring 24, and the heating element 4 ′, and generates power and generates heat by providing the piezoelectric element 2 ′, the valve spring 24, and the heating element 4 ′ around the engine valve 1E. Can be possible. That is, according to the heater 100E, even if the power generation unit, the action unit, and the heat generation unit are provided outside the engine valve 1E, power generation and heat generation that can heat the engine valve 1E can be performed. As a result, reliability can be ensured while reducing wiring.

  The heating device 100E connects the piezoelectric element 2 ′ and the heating element 4 ′ by providing the piezoelectric element 2 ′ so that the spring force of the valve spring 24 acts on the peripheral portion of the valve guide 21C via the valve spring seat 23. The wiring to be performed can also be shortened. As a result, it is possible to suitably reduce wiring. In addition, when the mechanical valve 1E is indirectly heated, the heating device 100E provided with the heat generating element 4 ′ in the valve guide 21C has vibration and heat compared to the case where the heat generating element is provided in the seat portion on which the mechanical valve 1E is seated, for example. This is advantageous in that the influence of is small.

  The heating device 100E can prevent the clearance with the stem portion S from being narrowed when the engine is warmed up by providing the heating element 4 ′ in the valve guide 21C. That is, when the engine valve 1E is directly heated, there is a concern that wear may occur as a result of the clearance being narrowed when the engine is warmed up. However, in the heating device 100E, the valve guide 21C is heated, thereby generating wear. It can also be suppressed.

  Further, in order to suppress the occurrence of wear, for example, it is conceivable to set a large clearance when the engine is warmed up. In this case, there is a concern that the swing of the engine valve 1E becomes large after the engine is warmed up. . On the other hand, in the heating device 100E, the occurrence of wear can be suppressed without promoting such vibration. For this reason, the heating device 100E can ensure higher reliability as compared with the case of directly heating the engine valve 1E.

  For example, the heating device 100E may be modified as follows. FIG. 12 is a view showing a heating device 100E ′, which is a modification of the heating device 100E. The heating device 100E ′ includes a coil 8 as a power generation unit and a heat generation unit. Moreover, the magnet 9 is provided as an action part. The engine valve 1E ′ is substantially the same as the engine valve 1E except that a hollow portion R and a plug (not shown) that closes the hollow portion R are provided and a magnet 9 is further provided.

  The magnet 9 is provided in a state of being fixed inside the stem portion S. For example, after the magnet 9 is inserted into the hollow portion R, it can be fixed by pressing it with a plug that closes the opening of the hollow portion R in the same manner as the plug 6. Alternatively, for example, the hollow portion R can be fixed by being press-fitted into an end portion opposite to the umbrella portion U of the portion extending along the stem portion S. A valve guide 21D is provided for the engine valve 1E ′ in use. A coil 8 is provided in the valve guide 21D. The valve guide 21D is not particularly an electromagnet, and an appropriate metal can be applied to the material of the valve guide 21D.

  In the heating device 100E ′, when the magnet 9 approaches and separates from the valve guide 21D, the coil 8 generates power. Then, the valve guide 21D is heated by the heat generated by the coil 8 itself. Therefore, in the heating device 100E ′, the coil 8 is a power generation unit that also serves as a heat generation unit. That is, the power generation unit and the heat generation unit may be realized by the same configuration, for example. And according to this engine valve 1E ', by providing a power generation part and a heat generation part in the peripheral part of engine valve 1E' among a power generation part, an action part, and a heat generation part, wiring reduction is carried out like heating device 100E. Reliability can be ensured while planning.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

Engine valve 1A, 1A ', 1B, 1C, 1D, 1D', 1E, 1E '
Piezoelectric element 2, 2 '
Weight 3, 3 '
Heating element 4, 4 '
Switch 5
Dielectric elastomer 7
Coil 8
Magnet 9
Heating device 100A, 100A ′, 100B, 100C, 100D, 100D ′, 100E, 100E ′

Claims (3)

A power generation unit;
An action part that acts to generate electricity to the power generation part;
A heating unit that generates heat according to the power supplied from the power generation unit,
Of the power generation section, the action section, and the heat generation section, at least the power generation section and the heat generation section are provided in an engine valve provided for a combustion chamber of an internal combustion engine, or provided in a peripheral portion of the engine valve. Engine valve heating device. A heating device for an engine valve according to claim 1,
An engine valve heating device further comprising a control unit that controls supply of electric power from the power generation unit to the heat generation unit according to temperature. A heating device for an engine valve according to claim 2,
The power generation unit, the heat generation unit and the control unit are provided in the engine valve,
When the control unit controls the supply of power from the power generation unit to the heat generation unit according to temperature, the power generation unit and the heat generation unit are electrically connected when the temperature is lower than a predetermined value, A heating device for an engine valve that electrically disconnects the power generation unit and the previous heat generation unit when is higher than the predetermined value.

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