JP6340803B2 - Valve device and internal combustion engine - Google Patents

Description

  The present invention relates to a valve device and an internal combustion engine, and more specifically, a valve capable of accurately controlling a flow rate passing through the valve device by removing deposits adhered between a valve seat and a valve body. The present invention relates to an apparatus and an internal combustion engine.

  It has been proposed to mount an EGR system as a method of reducing engine exhaust gas. By installing the EGR system, by introducing a gas in which air and EGR gas are mixed into the cylinder, the combustion temperature in the cylinder is lowered and NOx is reduced.

  However, if EGR gas is introduced more than necessary, the amount of smoke discharged increases, so the ratio of EGR gas and air needs to be an appropriate ratio in accordance with the engine operating conditions. In order to realize an appropriate ratio, the amount of EGR gas introduced into the cylinder is controlled using an EGR valve.

  Since EGR gas is exhaust gas itself, smoke is present, and soot in the smoke adheres to the valve seat and valve body of EGR gas. In this case, problems such as the inability to control the flow rate of exhaust gas when the opening of the EGR valve is very small occur, resulting in problems such as deterioration in exhaust gas emissions and engine output.

  In this regard, a device in which the valve shaft is supported by a diaphragm so as to be rotatable about an axis, an impeller is attached to the valve shaft on the exhaust gas inlet side, and when the exhaust gas flows through the suction port, the impeller rotates to rotate the valve shaft Has been proposed (see, for example, Patent Document 1).

  However, in this apparatus, when the flow rate of the exhaust gas flowing into the EGR valve is small, the impeller cannot be rotated by the exhaust gas. Therefore, when there are many opportunities to make the opening of the EGR valve very small, the valve body cannot block the suction port due to the sticking between the valve seat and the valve body, and the opening of the EGR valve It becomes impossible to control the flow rate of exhaust gas when is very small.

  In addition, since the valve shaft is rotated when the valve body is separated from the valve seat, the soot adhering to the valve body can be shaken off, but the soot adhering to the valve seat remains as it is. A trap will remain between.

Japanese Utility Model Publication No. 58-44465

  The present invention has been made in view of the above-described problems, and the problem is that the valve seat and the valve body are rubbed together to remove the adhering matter adhering between the valve seat and the valve body. It is possible to prevent a valve seat from being blocked by deposits, and to provide a valve device and an internal combustion engine that can accurately control the flow rate of exhaust gas.

In order to solve the above problems, a valve device of the present invention includes a valve cylinder having an opening through which a fluid passes, a valve seat provided in the opening, and a contact with the valve seat to shield the opening. And a valve body that opens away from the valve seat and opens the opening, a valve shaft to which the valve body is fixed, and the valve shaft in the axial direction so that the valve body is separated from the valve seat. A valve device comprising: a driving device that moves; and a biasing member that biases the valve shaft in an axial direction so that the valve body contacts the valve seat, wherein the driving device or the biasing member is the valve when moving the axial in an axial direction, Rutotomoni rotated into a rotary motion part of the linear movement of the valve shaft, the valve shaft in a state where the valve body is shielded from the opening around the axis A movement converting portion for rubbing the valve body and the valve seat with each other is provided.

  According to this configuration, a part of the linear motion of the valve shaft can be converted into rotational motion by the motion conversion unit, and the valve body and the valve seat can be rubbed against each other by rotating the valve shaft around the shaft. Even if such impurities adhere to the surface of the valve body in contact with the valve seat and the surface of the valve seat in contact with the valve body, the deposit can be removed. Therefore, it is possible to avoid the occurrence of troubles in the opening / closing control of the valve device due to the deposit between the valve body and the valve seat.

  In addition, a part of the linear motion of the valve shaft is converted into rotational motion by the motion conversion unit, and the valve body and the valve seat are rubbed together, so that the deposits between the valve body and the valve seat can be reliably removed. it can.

  In particular, when the above valve device is used as an EGR valve, accumulation of soot in the exhaust gas between the valve body and the valve seat is avoided, and controllability of the exhaust gas flow rate at a minute opening is ensured. Therefore, the ratio of air and EGR gas can be set to an appropriate ratio that matches the operating conditions of the internal combustion engine. Thereby, it is possible to avoid the deterioration of the exhaust gas emission amount and the deterioration of the output of the internal combustion engine.

  Further, in the above valve device, the motion conversion unit includes a notch groove and a driven node guided by the notch groove, and either the notch groove or the driven node is provided on the valve shaft, If the other side is provided on the outer periphery of the valve shaft, a part of the linear motion in the axial direction of the valve shaft can be converted into a rotational motion around the shaft by the principle of the cam. The kimono can be removed.

  In addition, in the above valve device, the valve shaft is expanded and contracted in the axial direction of the valve shaft by the valve shaft main body to which the valve body is fixed, a contact panel fixed to the valve shaft main body, and the driving device. And a telescopic shaft supported by the telescopic shaft so as to be rotatable about the axis of the valve shaft, and a rotating disk that is in surface contact with the contact disk, the follower node on the rotating disk, and the outer periphery of the rotating disk When the notch groove is provided and the driving device or the biasing member moves the valve shaft in the axial direction, the contact plate and the rotating plate are not in surface contact with each other. It is desirable to include an engagement mechanism that engages the disc and the rotary disc in the rotational direction around the valve shaft.

  According to this configuration, in a state where the contact plate and the turntable are not in surface contact, that is, in a state where the valve body and the valve seat are in contact, the rotation plate is rotated by the motion conversion unit, and the rotation of the turntable is related. The contact board can be transmitted by the combined mechanism to rotate the contact board. Thereby, without separating a valve body from a valve seat, a valve body and a valve seat can mutually be rubbed, and the deposit between a valve body and a valve seat can be removed reliably.

  For example, in the valve device, when the opening of the valve device is opened, the expansion / contraction shaft is extended by the driving device, and the rotary disk moves in the axial direction accordingly. The follower provided on the rotating disk is guided by the spiral cut groove, and the rotating disk moves in the axial direction while rotating. In addition, the contact plate and the valve shaft main body that are engaged in the rotation direction of the rotary plate by the engagement mechanism rotate. At this time, since the contact plate and the rotating plate are not in surface contact, the valve body and the valve seat can be rubbed against each other without being separated from the valve seat.

Here, the surface contact between the contact plate and the rotating plate means that the surface on the rotating plate side of the contact plate comes into contact with the surface on the contact plate side of the rotating plate.

  And the internal combustion engine of this invention for solving said subject is provided and provided with the valve apparatus as described above as an EGR valve. According to this configuration, it is possible to remove the wrinkles adhering between the valve body and the valve seat, and to prevent the EGR valve opening / closing control from being hindered, thereby enabling the minute opening / closing control of the EGR valve. Thus, deterioration of exhaust gas and output can be suppressed.

  According to the valve device and the internal combustion engine of the present invention, a part of the linear motion of the valve shaft is converted into rotational motion by the motion conversion unit, and the valve body and the valve seat are rubbed against each other by rotating the valve shaft around the shaft. Therefore, even if fluid impurities adhere to the surface of the valve body that contacts the valve seat and the surface of the valve seat that contacts the valve body, the adhered matter can be removed. Therefore, it is possible to avoid the occurrence of troubles in the opening / closing control of the valve device due to the deposit between the valve body and the valve seat.

  In addition, a part of the linear motion of the valve shaft is converted into rotational motion by the motion conversion unit, and the valve body and the valve seat are rubbed together, so that the deposits between the valve body and the valve seat can be reliably removed. it can.

  As a result, the controllability of the flow rate of the exhaust gas at a very small opening degree can be ensured, and the ratio of air and EGR gas can be set to an appropriate ratio according to the operating conditions of the internal combustion engine, so that the exhaust gas emission amount is deteriorated. And deterioration of the output of the internal combustion engine can be avoided.

It is a figure which shows the valve apparatus of embodiment which concerns on this invention, (a) shows a mode that a valve axis | shaft begins to rotate around an axis | shaft, (b) is an arrow line view shown by the arrow A. It is a figure which shows the valve apparatus of embodiment which concerns on this invention, (a) shows a mode that a valve shaft finishes rotating around an axis | shaft, (b) is an arrow line view shown by the arrow A. It is a figure which shows the valve apparatus of embodiment which concerns on this invention, (a) shows a mode that the valve shaft moved to the axial direction, (b) is an arrow line view shown by the arrow A. It is an expanded view which shows the notch groove of the motion conversion part of the valve apparatus of FIG. It is a figure which shows the rotary disk of the valve shaft of the valve apparatus of FIG. 1, (a) shows the top view of a rotary disk, (b) is the side view shown by arrow B. It is a figure which shows the contact board of the valve shaft of the valve apparatus of FIG. 1, (a) shows the top view of a contact board, (b) is sectional drawing shown by the arrow C. 1 is a diagram showing an internal combustion engine according to an embodiment of the present invention.

  Hereinafter, a valve device and an internal combustion engine according to embodiments of the present invention will be described. In addition, in the axial direction of the valve shaft in FIG. 1A, the right to left direction is the x1 direction, and the left to right direction is the x2 direction.

  As shown to (a) of FIG. 1, the EGR valve (valve apparatus) 1 of embodiment is provided in the valve cylinder 11 which has the opening parts 10a-10c through which the waste gas after combustion passes in order, and the opening part 10b. A valve seat 12 that contacts the valve seat 12 to shield the opening 10b and is spaced from the valve seat 12 to open the opening 10b; and a valve shaft 14 to which the valve body 13 is fixed. A drive unit 15 that moves the valve shaft 14 in the axial direction so that the valve body 13 is separated from the valve seat 12, and a spring that biases the valve shaft 14 in the axial direction so that the valve body 13 contacts the valve seat 12. (Biasing member) 16 is provided.

When exhaust gas is introduced into the cylinder by the EGR valve 1, first, the motor 15a of the driving device 15 is driven, and the conversion unit 15b converts the rotational motion of the motor 15a into linear motion. Next, the valve shaft 14 moves in the x2 direction by the linear motion, and the valve body 13 is separated from the valve seat 12.
Thereby, the opening part 10b is open | released, waste gas passes through opening part 10a-10c in order, and waste gas is introduce | transduced in a cylinder. On the other hand, when the exhaust gas is not introduced into the cylinder, the motor 15a of the driving device 15 is stopped. Next, the valve shaft moves in the x1 direction by the urging force of the spring 16, and the valve body 13 contacts the valve seat 12. Thereby, the opening 10b is shielded and the introduction of the exhaust gas is stopped.

  However, since smoke exists in the exhaust gas, when the opening 10b of the EGR valve 1 is opened, the surface that contacts the valve seat 12 of the valve body 13 and the surface that contacts the valve body 13 of the valve seat 12煤 adheres to the surface. In order to remove the wrinkle between the valve seat 12 and the valve body 13, the EGR valve 1 is configured such that when the valve shaft 14 is moved in the axial direction by the drive device 15 or the spring 16, the straight line of the valve shaft 14 is removed. A part of the motion is converted into a rotational motion, and the motion conversion unit 20 is provided that rotates the valve shaft 14 around the shaft and rubs the valve body 13 and the valve seat 12 together.

  In addition, the EGR valve 1 includes a motion conversion portion 20 that includes a cut groove 21 and a follower node 22 that is guided by the cut groove 21, and the cut cylinder 21 is provided on the outer periphery of the valve shaft 14. And the follower node 22 is provided on the valve shaft 14.

  Specifically, the valve shaft 14 includes a valve shaft main body 24 to which the valve body 13 is fixed, a contact panel 25 fixed to the valve shaft main body 24, and a telescopic shaft 26 that expands and contracts in the axial direction of the valve shaft 14 by the driving device 15. And a rotary disc 27 that is supported by the telescopic shaft 26 so as to be rotatable around the axis of the valve shaft 14 and that makes surface contact with the contact disc 25. In addition, the outer cylinder 23 provided on the outer periphery of the rotating disk 27 is provided with a notch groove 21 of the motion converting unit 20 and a follower node 22 of the rotating disk 27, and the valve shaft 14 is driven by the driving device 15 or the spring 16. An engagement mechanism 30 is provided that engages the contact plate 25 and the turntable 27 in the rotation direction of the turntable 27 when the contact plate 25 and the turntable 27 are not in surface contact when moved in the axial direction. Composed.

  The motion conversion unit 20 is a mechanism that converts a part of the linear motion in the axial direction of the valve shaft 14 by the driving device 15 or the spring 16 into rotational motion by applying the principle of the cam. Specifically, the follower node 22 provided in the rotating plate 27 is guided to the spiral notch groove 21 provided in the outer cylinder 23, and the follower node 22 is moved when the follower node 22 moves along the notch groove 21. It is a mechanism that moves in the axial direction while rotating.

  FIG. 4 is a development view of the cut groove 21 provided on the inner peripheral surface of the outer cylinder 23. The cut groove 21 includes a cam groove 21a that is cut obliquely in FIG. 4 and a first guide portion 21b that guides the driven node 22 to the cam groove 21a when the driven node 22 moves from the x1 direction to the x2 direction. And a second guide portion 21c for guiding the driven node 22 to the cam groove 21a when the driven node 22 moves from the x2 direction to the x1 direction.

  The cam groove 21 a is a groove that spirals when provided in the outer cylinder 23. Accordingly, when the telescopic shaft 26 is expanded and contracted by the driving device 15 and the rotating disk 27 is moved in the axial direction, when the driven node 22 of the rotating disk 27 moves along the cam groove 21a, the rotating disk 27 is moved around the axis. Move in the axial direction while rotating.

  As shown in FIG. 5, the follower nodes 22 are provided at equal intervals on the outer periphery of the rotating disk 27, and the tip is rounded so as to smoothly follow the cut groove 21.

The follower node 22 is guided to the cam groove 21a by the first guide portion 21b of the cut groove 21 when the valve shaft 14 moves from the x1 direction to the x2 direction. Then, the driven node 22 moves along the cam groove 21 a, so that the rotating disk 27 moves in the axial direction while rotating around the axis of the valve shaft 14. On the other hand, when the valve shaft 14 moves from the x2 direction to the x1 direction, the follower node 22 is guided to the cam groove 21a by the second guide portion 21c, and moves along the cam groove 21a, so that the turntable 27 rotates. While moving in the axial direction.

  As shown in FIG. 1A, the outer cylinder 23 is a cylindrical cylinder provided on the outer periphery of the valve shaft 14, more specifically on the outer periphery of the rotating disk 27, and the inner peripheral surface of the outer cylinder 23. The above-described cut groove 21 is formed.

  In the valve shaft main body 24, the valve body 13 is fixed, a contact plate 25 is fixed to an end portion on the x1 direction side, and an end portion on the x2 direction side is urged by a spring 16.

  As shown in FIG. 6, the contact board 25 is formed in a disk shape and includes an engagement hole 31 of the engagement mechanism 30.

  The telescopic shaft 26 is expanded by the driving device 15 when the opening 10b is opened, and is contracted by the driving device 15 when the opening 10b is shielded. A rotating disk 27 is rotatably supported at the end of the telescopic shaft 26 on the x2 direction side.

  As shown in FIG. 5, the rotary disk 27 is formed in a disk shape and includes an engagement protrusion 32 of the engagement mechanism 30 protruding in the x2 direction. The engagement protrusion 32 enters the engagement hole 31 of the contact board 25, engages the contact board 25 and the rotating disk 27 in the rotation direction of the rotating disk 27, and the rotation disk 27 is rotated by the motion conversion unit 20. It is comprised so that the contact board 25 may be rotated.

  The engagement mechanism 30 includes an engagement hole 31 provided in the contact plate 25 and an engagement protrusion 32 provided on the rotary plate 27, and a mechanism for engaging the contact plate 25 and the rotary plate 27 in the rotation direction of the rotary plate 27. It is. By providing the engagement mechanism 30, the valve shaft 14 is rotated around the axis in a state where the contact plate 25 and the rotary plate 27 are not in surface contact, that is, in a state where the valve body 13 is in contact with the valve seat 12. Thus, the valve body 13 and the valve seat 12 can be rubbed together.

  Next, the operation of the EGR valve 1 of the embodiment will be described. Here, the operation of separating the valve body 13 from the valve seat 12 and opening the opening 10b will be described.

  As shown in FIG. 1, first, the motor 15a of the drive device 15 is driven, and the conversion unit 15b converts the rotational motion of the motor 15a into a linear motion, thereby extending the telescopic shaft 26. Next, with the extension of the telescopic shaft 26, the turntable 27 moves from the x1 direction to the x2 direction. At this time, the follower node 22 provided on the rotating disk 27 is guided to the inlet of the cam groove 21 a by the first guide portion 21 b of the cut groove 21. At the same time, the engaging protrusion 32 of the rotating disk 27 enters the engaging hole 31 of the contact disk 25 to engage the contact disk 25 and the rotating disk 27 in the rotation direction of the rotating disk 27.

  Next, as shown in FIG. 2, when the telescopic shaft 26 is further extended by the driving device 15, the driven node 22 moves from the x1 direction to the x2 direction along the cam groove 21 a of the cut groove 21. At this time, since the follower node 22 moves along the spiral cam groove 21a, the rotating disk 27 moves from the x1 direction to the x2 direction while rotating around the axis of the valve shaft 14.

  Next, when the rotating disk 27 rotates, the engaging protrusion 32 of the rotating disk 27 collides with the peripheral edge of the engaging hole 31 of the contact disk 25, and the valve shaft main body 24 to which the contact disk 25 and the contact disk 25 are fixed becomes the valve. It rotates around the axis of the axis 14. At this time, the valve body 13 and the valve seat 12 rub against each other to remove deposits such as wrinkles between the valve body 13 and the valve seat 12.

Thus, in order to rub the valve body 13 and the valve seat 12, when the follower 22 rotates along the cam groove 21a and the rotating disk 27 rotates, the rotating disk 27 causes the contact disk 25 and the valve shaft main body to rotate. 24 must not be moved in the x2 direction. Therefore, in the EGR valve 1 of this embodiment, the contact plate 25 and the turntable 27 are rotated in the rotation direction of the turntable 27 by the engagement mechanism 30 including the engagement hole 31 of the contact plate 25 and the engagement protrusion 32 of the turntable 27. The rotating disk 27 is configured to rotate until the contact disk 25 and the rotating disk 27 come into surface contact with each other. In addition, the cam groove 21 a of the cut groove 21 of the motion conversion unit 20 is also configured to rotate the rotating disk 27 until the contact disk 25 and the rotating disk 27 come into surface contact.

  Next, as shown in FIG. 3, when the telescopic shaft 26 is further extended by the driving device 15, the contact plate 25 and the rotary plate 27 come into surface contact, and the contact plate 25 and the valve shaft main body 24 move in the x2 direction. . At this time, the valve body 13 is separated from the valve seat 12, and the opening 10b is opened. Further, since the driven node 22 passes through the cam groove 21a of the cut groove 21, the rotating disk 27 does not rotate.

  For the operation of bringing the valve body 13 into contact with the valve seat 12 and shielding the opening 10b, the telescopic shaft 26 is contracted by the driving device 15, the valve shaft main body 24 is urged in the x1 direction by the spring 16, and the valve Since only the shaft 14 moves from the x2 direction to the x1 direction is the reverse of the above operation, the description thereof is omitted.

  According to the EGR valve 1 of this embodiment, a part of the linear motion of the valve shaft 14 is converted into a rotational motion by the motion conversion unit 20, and the valve shaft 14 is rotated around the shaft to rotate the valve body 13 and the valve seat 12. Since exhaust gas soot and the like adhere to the surface of the valve body 13 that contacts the valve seat 12 and the surface of the valve seat 12 that contacts the valve body 13, it can be removed. Can do. For this reason, it is possible to avoid the occurrence of troubles in the opening / closing control of the EGR valve 1 due to the deposits such as wrinkles between the valve body 13 and the valve seat 12.

  In addition, a part of the linear motion of the valve shaft 14 is converted into rotational motion by the motion conversion unit 20 and the valve body 13 and the valve seat 12 are rubbed together, so that the attachment between the valve body 13 and the valve seat 12 is ensured. The kimono can be removed.

  In addition, in a state where the contact plate 25 and the rotary plate 27 are not in surface contact, that is, in a state where the valve body 13 and the valve seat 12 are in contact, the rotary plate 27 is rotated by the motion conversion unit 20, and the rotary plate 27 is rotated. Can be transmitted to the contact board 25 by the engagement mechanism 30 and rotated, so that the valve body 13 and the valve seat 12 are rubbed against each other without separating the valve body 13 and the valve seat 12. Deposits such as wrinkles between the valve seat 13 and the valve seat 12 can be reliably removed.

  Next, an example of the engine 2 including the EGR valve 1 will be described. The engine 2 sucks air supplied to the engine body 3 through an air cleaner 4, a compressor of a turbocharger 5, an intercooler 6, and an intake throttle 7, and exhausts exhaust gas discharged from the engine body 3 into a turbo. It is discharged via the turbine of the charger 5 and the exhaust gas treatment device 8. And it comprises an EGR cooler 9 and an EGR valve 1 as an EGR system for mixing exhaust gas with air as EGR gas.

  In the engine 2, the optimum ratio of EGR gas and air is controlled by the aforementioned EGR valve 1 in accordance with the operating conditions of the engine 2.

  According to this engine 2, since deposits such as soot are not deposited between the valve body 13 and the valve seat 12 of the EGR valve 1, the controllability of the flow rate of the exhaust gas at a minute opening is ensured, and the air and the EGR Since the gas ratio can be set to an appropriate ratio that matches the operating conditions of the engine 2, it is possible to avoid the deterioration of the exhaust gas emission amount and the deterioration of the output of the engine 2.

In the above embodiment, the EGR valve 1 is described as an example of the valve device, but the present invention is not limited to this.

  Moreover, arrangement | positioning of the opening parts 10a-10c of the EGR valve 1 of said embodiment, arrangement | positioning of the spring 16, etc. are examples, and can be changed suitably. In addition, instead of the driving device 15 that converts the rotational motion of the motor 15a into a linear motion by the converter 15b, for example, a device that moves the plunger using the magnetic force of a solenoid can be used.

  Further, in the above embodiment, as the motion conversion unit 20, the linear motion of the valve shaft 14 is achieved by the cut groove 21 provided around the valve shaft 14 and the follower node 22 provided in the valve shaft 14. Although the example which converts a part into a rotational motion was demonstrated, this invention is not limited to this. For example, it is good also as a structure which provided the follower node around the valve shaft and provided the notch groove in the valve shaft. In addition, the cut groove 21 may be provided over the moving range of the rotating disk 27. For example, the second guide portion 21c can be formed as a linear groove from the x1 direction to the x2 direction. Furthermore, the number of the follower nodes 22 and the number of the engagement protrusions 32 can be appropriately changed.

  In the above embodiment, the contact plate 25 and the rotary plate 27 are connected to each other by the engagement hole 31 provided in the contact plate 25 and the engagement protrusion 32 provided in the rotary plate 27 as the engagement mechanism 30. Although the example which engages in the rotation direction of the turntable 27 before the surface contact of 25 and the turntable 27 was demonstrated, this invention is not limited to this. For example, the contact protrusion 25 may be provided on the contact board 25, and the engagement hole 31 may be provided on the rotary disk 27.

  The valve device of the present invention rubs together the valve seat and the valve body, and removes the adhering matter adhering between the valve seat and the valve disc, thereby preventing the valve disc from being able to shield the valve seat by the adhering matter. Since the flow rate of the exhaust gas can be accurately controlled, it can be used for an internal combustion engine including an EGR system that introduces a mixture of air and exhaust gas into the cylinder.

1 EGR valve (valve device)
2 Engine (Internal combustion engine)
10b Opening 11 Valve cylinder 12 Valve seat 13 Valve body 14 Valve shaft 15 Drive device 16 Spring (biasing member)
20 motion conversion portion 21 notch groove 21a cam groove 22 driven node 23 outer cylinder 24 valve shaft body 25 contact panel 26 telescopic shaft 27 rotating disk 30 engagement mechanism 31 engagement hole 32 engagement protrusion

Claims (4)

A valve cylinder having an opening through which a fluid passes, a valve seat provided in the opening, and shielding the opening by contacting the valve seat, and opening the opening away from the valve seat A valve body, a valve shaft to which the valve body is fixed, a drive device that moves the valve shaft in an axial direction so that the valve body is separated from the valve seat, and the valve body is in contact with the valve seat In a valve device comprising a biasing member that biases the valve shaft in the axial direction as described above,
When the drive device or the biasing member moves the valve shaft in the axial direction, a part of the linear motion of the valve shaft is converted into rotational motion, and the valve body shields the opening. in the valve device and providing a motion converter rubbed the valve shaft is rotated with Rutotomoni the valve body the valve seat to each other about the axis.   The motion converting portion includes a notch groove and a follower guided by the notch, and either the notch groove or the follower is provided on the valve shaft, and the other is provided on the outer periphery of the valve shaft. The valve device according to claim 1, wherein the valve device is provided. The valve shaft includes a valve shaft main body to which the valve body is fixed, a contact panel fixed to the valve shaft main body, a telescopic shaft that expands and contracts in the axial direction of the valve shaft by the driving device, and the telescopic shaft. It is supported rotatably around the axis of the valve shaft, and comprises a rotating disk that makes surface contact with the contact disk,
In the case where the follower node is provided on the rotating disk and the cut groove is provided on the outer periphery of the rotating disk, and the driving device or the biasing member moves the valve shaft in the axial direction, the contact disk 3. An engagement mechanism that engages the contact plate and the turntable in a rotation direction around the valve shaft when the turntable and the turntable are not in surface contact. Valve device.   An internal combustion engine comprising the valve device according to any one of claims 1 to 3 as an EGR valve.

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