JP4225232B2 - Valve for exhaust gas recirculation device - Google Patents

Description

    The present invention relates to an exhaust gas recirculation device in which a part of exhaust gas of an internal combustion engine is recirculated to an intake passage in an intake pipe, and more particularly to an exhaust gas for adjusting a flow rate of exhaust gas mixed into the intake passage. The present invention relates to a valve for a recirculation device.

Conventionally, in a valve for an exhaust gas recirculation device provided in a recirculation passage for returning a part of exhaust gas flowing through an exhaust pipe of an internal combustion engine to an intake pipe, the valve body is separated from the valve seat when the operation of the internal combustion engine is stopped. An exhaust gas recirculation valve is known. (For example, Patent Document 1) In this conventional exhaust gas recirculation device valve, by separating the valve body from the valve seat when the operation of the internal combustion engine is stopped, an adhesive such as carbon entering from the exhaust passage is provided. This prevents the sticking of the valve body due to a certain substance (deposit).
JP-A-5-99077

    If the exhaust gas recirculation device valve is fully closed when the internal combustion engine is stopped, there is a risk of the valve element sticking due to deposits. In the conventional example described above, the problem of sticking is solved by fully opening the valve body by the spring biased to the fully open side. However, in this case, when the exhaust gas recirculation device valve breaks down, the amount of exhaust gas recirculation becomes too large, which may cause a start failure, which is not preferable in terms of fail-safety.

    The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a valve for an exhaust gas recirculation device of an internal combustion engine, to a valve seat of a valve body by an adhesive substance when the operation of the internal combustion engine is stopped. It is intended to prevent sticking and to fail-safe when the exhaust gas recirculation device valve fails.

    To achieve the above object, an exhaust gas recirculation valve according to claim 1 of the present invention communicates with an exhaust passage of an internal combustion engine and recirculates a part of the exhaust gas to an intake passage. A valve housing, a valve seat provided in the valve housing, a valve body provided so as to be able to contact with and separate from the valve seat, and changing an opening degree of the exhaust gas recirculation passage, and the valve body integrated with the valve housing And a drive means for driving the valve shaft in the axial direction, and when the operation of the internal combustion engine is stopped, the valve body is opened from the valve seat by a predetermined opening degree by operation of the drive means. It is characterized by being held in a different position.

    Thus, the exhaust gas recirculation device valve according to claim 1 is configured to hold the valve body at a position opened by a predetermined opening from the valve seat when the operation of the internal combustion engine is stopped. In addition, even if the exhaust gas recirculation device valve breaks down when the internal combustion engine is started, the exhaust gas recirculation amount becomes smaller than that of the conventional one, so that the start failure of the internal combustion engine can be prevented.

In addition, when the exhaust gas recirculation valve breaks down during high-load operation, the exhaust gas recirculation amount is less than that at the fully open position, so it is possible to suppress the output drop and the increase in soot in the exhaust gas. it can. Further, the present invention is characterized in that an annular groove portion is provided on the outer periphery of the valve body, and an annular seal ring is provided in the groove portion. With this annular seal ring, it is possible to further improve the sealing performance when fully closed. Further, in claim 1, the valve seat is provided with a plurality of protrusions that extend in the operation direction of the valve body and always guide the annular seal ring or the flexible flange portion. The length is equal to or greater than the operating range of the valve body. By adopting such a configuration, the seal ring or the flexible flange is always in sliding contact with the protrusion even in a range other than the valve seat, so that the valve body is away from the valve seat. However, the seal ring and the flexible flange can be prevented from being caught by the end of the valve seat when it is pushed toward the valve shaft and passes through the valve seat.

Further, in the exhaust gas recirculation device valve according to claim 3 and claim 4 of the present invention, the position opened by the predetermined opening degree described in claim 1 is set to an opening degree narrower than the fully opened position, The position is at least a position where the internal combustion engine can be started. In this way, in the exhaust gas recirculation device valve according to claim 3 and claim 4 , the internal combustion engine can be reliably started by setting the valve body when the operation of the internal combustion engine is stopped to an opening at which the internal combustion engine can be stopped. Can be.

The exhaust gas recirculation device valve according to claim 5 of the present invention is such that the fully closed position of the valve body is in the axial direction of the valve shaft and the position of the valve body when the internal combustion engine is stopped is fully opened. It is characterized by being between the positions.

Thus, by arranging the fully closed position of the valve body as described in claim 5 , the internal combustion engine is stopped, started, exhaust gas recirculation control, and until the operation is stopped again. The valve body passes through the valve seat. Each time the valve body passes through the valve seat, the deposit attached to the valve seat can be scraped off, so that there is no need to worry about sticking of the valve body.

    Further, since the valve position can be set by one-way operation from the time when the internal combustion engine is stopped to the time when the engine is operating normally, that is, the operation of the valve body 7 from the valve position when the engine is stopped to the fully closed position. And the direction of operation of the valve body 7 from the fully closed position to the fully open position are the same, and there is no need to switch the drive direction of the drive means, which has another effect of improving responsiveness.

The exhaust gas recirculation device valve according to claim 6 of the present invention is such that the position of the valve body when the operation of the internal combustion engine is stopped is in the axial direction of the valve shaft, and the valve body is fully closed and fully opened. The exhaust gas recirculation device valve according to claim 7 is characterized in that the valve body is arranged on the exhaust passage side from the valve seat.

Unlike claim 5 of the present invention, it is possible to arrange the valve body as described in claims 6 and 7 of the present invention. In particular, according to this configuration, the problem of valve sticking and starting failure of the internal combustion engine is solved, and even when the exhaust gas recirculation valve breaks down during high load operation, the exhaust gas flowing through the exhaust passage The valve body is pressed in the valve closing direction by the pressure of the valve, and can be seated on the valve seat to stop the recirculation of the exhaust gas, thereby preventing the output reduction of the internal combustion engine and the increase of soot in the exhaust gas. be able to.

The exhaust gas recirculation valve according to claim 9 of the present invention is characterized in that an inclined portion is provided on the outer periphery of the annular seal ring in contact with the valve seat. With such a configuration, the guide of the seal ring to the valve seat can be facilitated.

The exhaust gas recirculation device valve according to claim 10 of the present invention is characterized in that an annular groove is provided on the inner periphery of the valve seat, and an annular seal ring is provided in the groove. further the exhaust gas recirculation valve of claim 1 1, the inner periphery of the annular sealing ring in contact with the valve body, in which characterized in that a slope portion.

Configuration described above predicate claim 9, a seal ring provided in the valve body side, had an inclined portion provided on the periphery, in the structure according to claim 1 1, a seal ring provided on the valve seat side, that An inclined portion is provided on the inner periphery. Action, and effect are the same as the above mentioned claim 9.

An exhaust gas recirculation device valve according to an eighth aspect of the present invention is an inclined portion that guides the annular seal ring provided on the valve body or the flexible flange to a fully closed position of the valve body. Is provided in the valve seat. With such a configuration, the seal ring or the flexible collar provided on the valve body can be easily guided to the valve seat.

(First embodiment)
1 to 4 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing the entire structure of an exhaust gas recirculation device valve, and FIG. 2 shows the main components of the exhaust gas recirculation device valve. It is sectional drawing which shows a structure.

    The overall structure of the exhaust gas recirculation device valve of the present embodiment will be described with reference to FIG. The exhaust gas recirculation device valve of this embodiment includes a valve housing 1, a valve seat 5, a valve body 7, a valve shaft 8, a drive unit 6 that is a drive means, and a spring 10.

    The valve housing 1 is made of, for example, aluminum or cast iron, and an inlet port 2 into which exhaust gas flowing through a passage branched from an exhaust passage of an internal combustion engine (not shown) flows is formed on the side wall portion. An exhaust gas recirculation passage 4 is formed further inside the inlet port 2, and a valve seat 5 having a guide portion 5 a is assembled in the middle of the exhaust gas recirculation passage 4. The valve seat 5 may be formed separately from the valve housing 1 as shown in FIG. 1, or may be formed integrally with the valve housing 1. The structure of the valve seat 5 shown in FIG. 1 will be described later in detail with reference to FIG.

    On the side wall of the valve housing 1, an outlet port 3 is formed in a passage connected to an intake passage of an internal combustion engine (not shown) through which exhaust gas whose flow rate is adjusted flows out. The arrangement of the inlet port 2 and the outlet port 3 is not limited to the side wall portion of the valve housing 1 as shown in FIG. 1, but can be freely formed by handling the exhaust passage and the intake passage of the internal combustion engine. Of course.

    Above the valve housing 1, a drive unit 6 that constitutes a part of the drive means is provided. The drive unit 6 may be, for example, a servo motor, a stepping motor, a DC motor, a linear solenoid, a negative pressure, etc., and is driven to reciprocate in the axial direction with respect to a valve shaft 8 for opening and closing a valve body 7 described later. Transmitting power.

    A valve body 7 is fixed to a lower end portion of the valve shaft 8, and a plate pressure 9 and a spring 10 constituting a part of driving means are provided on the upper end portion. The plate pressure 9 is a component for transmitting a biasing force in one direction (upward in the drawing) of the spring 10 to the valve shaft 8 and the valve body 7. By fixing the upper end of the spring 10 to the plate pressure 9 and the lower end to the valve housing 1, it is possible to transmit the urging force of the spring 10 to the valve shaft 8 and the valve body 7 via the pressure plate 9. Become.

    Therefore, when the operation of the internal combustion engine is stopped, the operation of the drive unit 6 is also stopped. Therefore, the urging force of the spring 10 drives the valve shaft 8 upward in the drawing to a preset valve opening position and stops. The predetermined opening determined by the valve opening position makes it possible to avoid sticking of the valve due to deposits while the operation of the internal combustion engine is stopped, and can be started even if this device malfunctions and malfunctions. The exhaust gas recirculation amount is set to a level.

    The exhaust gas recirculation device valve of the present embodiment is configured as described above, and a drive signal from a control device (not shown) is input to the drive unit 6, and the drive unit 6 is driven in response to the drive signal. Is transmitted to the plate pressure 9, the valve shaft 8, and the valve body 7 against the biasing force of the spring 10, and by adjusting the opening degree of the valve body 7 and the valve seat 5 provided in the valve housing 1, The flow rate of the exhaust gas flowing through the exhaust gas recirculation passage is adjusted.

    Next, the main structure of this embodiment will be described with reference to FIG.

    Since the valve shaft 8 and the valve body 7 are used in an environment of high temperature and corrosion, they are formed of a heat-resistant and corrosion-resistant material such as stainless steel. On the outer periphery of the disc-shaped valve body 7 fixed to the lower end portion of the valve shaft 8, a concave groove portion 7a for fitting an annular seal ring 11 for improving the sealing performance with the valve seat 5 is formed. . The annular seal ring 11 is made of metal and has a structure in which a part of the annular ring is cut. For this reason, a radial elastic force is applied to the seal ring 11. Since the seal ring 11 has an outer diameter larger than the inner diameter of the valve seat 5, when the seal ring 11 abuts on the valve seat 5 and the diameter is reduced, that is, toward the center of the seal ring 11. When a force is applied, a restoring force acts on the seal ring 11 and presses the valve seat 5, so that the sealing performance can be further improved.

    On the other hand, the valve seat 5 is formed as a cylinder having a diameter that allows the disc-like valve body 7 to pass therethrough, and is fixed in the valve housing 1. Further, the seal ring 11 fitted in the concave groove portion 7a of the valve body 7 is prevented from being detached from the concave groove portion 7a at the end portion 5b on the inlet port 2 side and the outlet port 3 side of the valve seat 5. Alternatively, three protruding guide portions 5 a for guiding the seal ring 11 to the valve seat 5 are formed in the vertical direction.

    Although not shown, the valve seat 5 and the protruding guide portion 5a can be formed integrally with the valve housing 1. Further, the inner surface of the guide portion 5a provided on the valve seat 5 is the same surface as the inner peripheral surface of the valve seat 5, and the seal ring 11 always has the guide portion 5a and the inner peripheral surface of the valve seat 5. It will come into sliding contact with.

    The valve for the exhaust gas recirculation device according to the present embodiment is configured so that the valve body 7 can pass through the valve seat 5, and both sides of the valve seat 5, that is, the first half portion where the valve body 7 passes through the valve seat 5. By adjusting the opening degree of the valve body 7 in the latter half, the exhaust gas recirculation amount flowing in the exhaust gas recirculation passage can be controlled.

    Next, the operation of this embodiment will be described with reference to FIG. FIG. 3 (a1) is a side view showing the state of the valve body 7 when the operation of the internal combustion engine is stopped, (b1) is a cross-sectional view seen from the II direction in (a1), and (c1) is ( It is the perspective view which looked at a1) from diagonally lower.

    As shown in FIG. 3 (a1), when the operation of the internal combustion engine is stopped, the drive unit 6 is also stopped, and the valve body 7 is held at a position slightly away from the valve seat 5 by the biasing force of the spring 10. The This slightly distant position means that even if the exhaust gas recirculation device valve drive unit 6 fails and does not operate at this degree of opening, at least a very small amount of exhaust gas recirculation capable of starting the internal combustion engine. It is a position that becomes.

    By holding the valve body 7 at the above-described opening degree, the problem of valve sticking when the operation of the internal combustion engine is stopped is solved, and even when this device fails, the internal combustion engine can be started and reliability is improved. In addition, since the exhaust gas recirculation amount is small, such as when the device breaks down during high-load operation, it is also effective in suppressing a decrease in output and an increase in soot in the exhaust gas.

    FIG. 3 (a2) is a side view showing a state in which the valve body 7 and the valve seat 5 are in contact with each other, that is, a fully closed state, and (b2) is a cross-sectional view seen from the II-II direction in (a2). (C2) is a perspective view of (a2) as viewed obliquely from below. As shown in FIG. 3 (a2), at least at the time of starting the internal combustion engine or during a high load operation, if the exhaust gas is recirculated, a combustion failure is caused. Therefore, the drive unit 6 is operated and the valve opening is fully closed. .

    Fig. 3 (a3) is a side view showing a state in which the valve body 7 is fully opened, (b3) is a sectional view seen from the III-III direction in (a3), and (c3) is an oblique view of (a3). It is the perspective view seen from the bottom. In FIG. 3 (a3), the valve body 7 is in a fully open state. However, during normal operation, the drive unit 6 is operated to control the exhaust gas recirculation amount, and the valve body 7 is fully closed in FIG. 3 (a2). The opening degree is adjusted between the fully open positions in FIG. When stopping the operation of the internal combustion engine from the normal operation, the valve unit 7 is temporarily returned to the position shown in FIG. 3 (a1) after passing the fully closed position by operating the drive unit 6 upward. .

    In addition to the above-described effects, the exhaust gas recirculation device valve is configured in this way, so that the valve body 7 starts from the upper side of the valve seat 5 when the internal combustion engine operation is stopped and the normal operation is started. When the operation is stopped again to the lower side, the valve seat 5 passes from the lower side to the upper side of the valve seat 5, so that the valve body 7 and the seal ring 11 pass the valve seat 5 each time. The deposit accumulated on the seat 5 is scraped off, and there is an effect of reliably preventing valve sticking.

    Furthermore, by providing a fully closed position between the valve position of the valve body 7 when the internal combustion engine operation is stopped and the valve position during the normal operation, the valve body 7 from when the internal combustion engine operation is stopped to the normal operation time is provided. Since the valve position can be set in one direction (downward), that is, the direction of operation of the valve body 7 from the valve position when the engine is stopped to the fully closed position, and the valve from the fully closed position to the fully open position. Since the direction of operation of the body 7 is the same, there is no need to switch the drive direction of the drive unit 6, and there is another effect of improving the responsiveness.

    In this embodiment, the valve position of the valve body 7 when the operation of the internal combustion engine is stopped is set to the outlet port 3 side from the valve seat 5, and the valve position when fully opened is set to the inlet port 2 side from the valve seat 5. It is clear that the relationship may be reversed. Furthermore, even if the inlet port 2 and the outlet port 3 formed in the valve housing 1 are provided opposite to the positions of the present embodiment, the operational effects of the present embodiment remain unchanged.

(First modification)
FIG. 4 is a cross-sectional view showing a modified example of the valve seat 5 in the first embodiment.

    As shown in FIG. 4, the valve seat 51 does not include the protruding guide portion 5 a provided in the valve seat 5 in the first embodiment, and instead the seal ring 11 is replaced with the flat portion 51 a of the valve seat 51. An inclined portion 51b is provided for guiding to the above. The inclined portion 51b is provided on the valve seat 51 so as to be inclined from the end portion 51c of the valve seat 51 toward the flat portion 51a. The diameter Φdn of the boundary line between the inclined portion 51b and the end portion 51c is larger than the diameter Φd0 of the seal ring 11 at the valve position when the operation of the internal combustion engine is stopped and the valve position when fully opened as shown in the figure.

    By forming such an inclined portion 51b at the end portion 51c of the valve seat 51, it is ensured that the seal ring 11 is caught by the end portion 51c when the seal ring 11 of the valve body 7 comes into contact with the flat portion 51a. Can be prevented. The inclined portion 51b only needs to be able to easily guide the seal ring 11 to the flat portion 51a. Therefore, the inclined portion 51b does not have to be a flat surface as shown in the drawing, and may be a curved surface. Moreover, about the operation | movement of the valve body 7, and another effect, it is the same as that of the effect of 1st Embodiment.

(Second modification)
5 and 6 are cross-sectional views showing modifications of the seal ring 11 provided in the valve body 7 in the first embodiment.

    Fig.5 (a) is sectional drawing which shows the valve body 7 and the valve seat 52, (b) is a bottom view of the valve body 7 which looked at (a) from the bottom. As shown in FIGS. 5 (a) and 5 (b), the valve body 7 is formed with a concave groove portion 7a like the valve body 7 in the first embodiment, and the seal ring 11 is fitted into the concave groove portion 7a. Yes. The difference from the seal ring 11 of the first embodiment is that the end portions 11b, 11b on the outer periphery of the seal ring 11 are provided with inclined portions 11a, and the guide of the seal ring 11 to the valve seat 52 is facilitated. The diameter Φdn of the boundary line between the inclined portion 11a of the seal ring 11 and the end portion 11b at the position of the valve body 7 indicated by the solid line in the drawing is smaller than the inner diameter Φd0 of the valve seat.

    By forming such an inclined portion 11 a at the end portion 11 b of the seal ring 11, it is ensured that the seal ring 11 is caught by the end portion 52 a of the valve seat 52 when the valve body 7 contacts the valve seat 52. Can be prevented. The inclined portion 11a only needs to be able to easily guide the seal ring 11 to the valve seat 52. Therefore, the inclined portion 11a does not have to be a flat surface as shown in the drawing, and may be a curved surface. Moreover, about the operation | movement of the valve body 7, and another effect, it is the same as that of the effect of 1st Embodiment.

    FIG. 6A is a cross-sectional view showing the valve body 7 and the valve seat 52, and FIG. 6B is a bottom view of the valve body 7 as viewed from below. As shown in FIGS. 6 (a) and 6 (b), the valve body 7 has a flexible collar 7 b of the valve body 7 instead of the seal ring 11 provided in the valve body 7 in the first embodiment. It is provided integrally on the outer periphery. When the flexible collar 7b abuts on the valve seat 52 (position indicated by a two-dot chain line in the figure), a restoring force acts on the deflected collar 7b in the direction in which the valve seat 52 is pressed, The sealing property with the valve seat 52 can be enhanced.

(Third Modification)
In the first embodiment, the first modified example, and the second modified example, the seal ring 11 or the flange portion 7b is provided on the valve body 7, but in the third modified example, the seal ring 111 or the valve seat 53 or 54 side is provided. A feature is that a flange 54a is provided. 7 to 9 are cross-sectional views showing modified examples in which a seal ring 111 is provided on the valve housing 1.

    FIG. 7 is a cross-sectional view showing that the seal ring 111 is provided on the valve seat side of the first embodiment. As shown in FIG. 7, the groove 53a is provided in the valve seat 53 of the valve housing 1, and the seal ring 111 is fitted into the groove 53a, thereby improving the sealing between the valve body 7 and the valve seat 53. It is. The effect of this structure is the same as that of the seal ring 11 shown in the first embodiment, the first modification, and the second modification.

    8A is a sectional view showing a state in which the seal ring 111 provided on the valve seat 53 and the valve body 7 are in contact with each other, and FIG. 8B is a cross-sectional view showing the seal ring 111 provided on the valve seat 53 and the valve body. FIG. 7 is a cross-sectional view showing a state where 7 is separated.

    As shown in FIGS. 8A and 8B, since the inclined portion 111a is provided on the inner periphery of the seal ring 111, the seal ring 111 can be easily moved when the valve body 7 comes into contact with the seal ring 111. It is pushed out. As shown in FIG. 8B, the diameter Φdn of the boundary line between the end portion 111b of the seal ring 111 and the inclined portion 111a when the valve body 7 is in the position indicated by the solid line in the figure is the diameter of the valve body 7 It is larger than Φd0.

    By forming such an inclined portion 111 a at the end 111 b of the seal ring 111, it is ensured that the valve body 7 is caught by the seal ring 111 when the valve body 7 contacts the seal ring 111 of the valve seat 53. Can be prevented. Note that the inclined portion 111a only needs to be able to easily guide the valve body 7 to the seal ring 111. Therefore, the inclined portion 111a does not have to be a flat surface as shown in the drawing, and may be a curved surface. Moreover, about the operation | movement of the valve body 7, and another effect, it is the same as that of the effect of 1st Embodiment.

    FIG. 9 is a cross-sectional view in which a flange 54a is provided on the valve seat 54 instead of the seal ring 111 shown in FIGS. (A) is sectional drawing which shows the state which the valve body 7 and the collar part 54a provided in the valve seat 54 contact | abutted, (b) has separated the valve body 7 and the collar part 54a provided in the valve seat 54. It is sectional drawing which shows the state, (c) is the bottom view which looked at the collar part 54a in (a), (b) from the lower side.

    The flange 54b provided in the valve seat 54 shown in FIG. 9 is made of a plurality of flexible metals, like the flange 7b provided in the valve body 7 shown in FIG. This is the same as the modification shown in FIG.

(Second Embodiment)
FIG. 10 shows a second embodiment of the present invention, and is a cross-sectional view showing only a portion different from the first embodiment.

    An exhaust gas recirculation passage 4 is formed in the valve housing 1 in which the inlet port 2 and the outlet port 3 are formed, and a valve seat 55 is assembled in the middle of the passage. A valve shaft 8 having a valve body 71 that can be seated on the valve seat 55 fixed to the lower end is supported by the valve housing 1. A drive unit 6 and a spring 10 (not shown) are provided at the upper end portion of the valve shaft 8 as in the first embodiment. When the operation of the internal combustion engine is stopped, the operation of the drive unit 6 is also stopped. Due to the urging force, the valve shaft 8 is driven to rest until a preset valve opening position between the fully open position and the fully closed position, which is indicated by a solid line in the figure.

    The predetermined opening determined by the valve opening position makes it possible to avoid sticking of the valve due to deposits while the operation of the internal combustion engine is stopped, and can be started even if this device malfunctions and malfunctions. The exhaust gas recirculation amount is set to a level. Further, the operating range of the valve body 71 is all on the inlet port 2 side from the valve seat 55.

    By holding the valve body 71 at the above-described opening degree, the problem of valve sticking when the operation of the internal combustion engine is stopped is solved, and even when this device fails, the internal combustion engine can be started and reliability is improved. In particular, in this embodiment, the entire operating range of the valve body 71 is on the inlet port side with respect to the valve seat 55. Therefore, when the exhaust gas pressure increases during high load operation, the valve body 71 is closed by this pressure. Since force is applied in the valve direction, even if the device breaks down, the valve body 71 is automatically closed by the exhaust gas, and it is possible to reliably prevent a decrease in output and an increase in soot in the exhaust gas.

It is sectional drawing which shows the whole structure of the valve | bulb for exhaust gas recirculation apparatuses of 1st Embodiment. It is sectional drawing which shows the valve | bulb principal part for exhaust gas recirculation apparatuses of 1st Embodiment. (A1) is a side view which shows the state of the valve body 7 at the time of an internal combustion engine operation stop, (b1) is sectional drawing seen from the II direction in (a1), (c1) is (a1) It is the perspective view which looked at from diagonally below. It is sectional drawing which shows the modification of the valve seat 5 in 1st Embodiment. (A) is sectional drawing which shows the valve body 7 and the valve seat 52, (b) is a bottom view of the valve body 7 which looked at (a) from the bottom. (A) is sectional drawing which shows the valve body 7 and the valve seat 52, (b) is a bottom view of the valve body 7 which looked at (a) from the bottom. It is sectional drawing which shows having provided the seal ring 11 in the valve seat side of 1st Embodiment. (A) is sectional drawing which shows the state which the seal ring 111 provided in the valve seat 53 and the valve body 7 contact | abutted, (b) is the seal ring 111 provided in the valve seat 53, the valve body 7, It is sectional drawing which shows the state which left | separated. (A) is sectional drawing which shows the state which the valve body 7 and the collar part 54a provided in the valve seat 54 contact | abutted, (b) has separated the valve body 7 and the collar part 54a provided in the valve seat 54. It is sectional drawing which shows the state, (c) is the bottom view which looked at the collar part 54a in (a), (b) from the lower side. It is sectional drawing which shows the valve | bulb principal part for exhaust gas recirculation apparatuses of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve housing, 2 Inlet port, 3 Outlet port, 4 Exhaust gas recirculation passage, 5 Valve seat, 5a Guide part of valve seat 5, 5b End of valve seat 5, 6 Drive unit (drive means), 7 Valve body, 7a Concave groove portion of the valve body 7, 7b ridge portion of the valve body 7, 8 valve shaft, 9 plate pressure, 10 spring (drive means), 11 seal ring, 11a inclined portion of the seal ring 11, 11b end portion of the seal ring 11

Claims (11)

(A) a valve housing that communicates with the exhaust passage of the internal combustion engine and has an exhaust gas recirculation passage for recirculating part of the exhaust gas to the intake passage;
(B) a valve seat provided in the valve housing;
(C) a valve body provided so as to be able to contact with and separate from the valve seat and changing an opening degree of the exhaust gas recirculation passage;
(D) a valve shaft that operates integrally with the valve body;
(E) and a drive means for driving the valve shaft in the axial direction,
(F) An annular concave groove portion is provided on the outer periphery of the valve body, and an annular seal ring is provided in the concave groove portion,
(G) The valve seat extends in the operation direction of the valve body and has a length equal to or longer than the operation range of the valve body, and has a plurality of protrusions that always guide the annular seal ring. Provided,
An exhaust gas recirculation device valve, wherein when the internal combustion engine is stopped, the valve element is held at a position opened by a predetermined opening from the valve seat by the operation of the driving means. (A) a valve housing that communicates with the exhaust passage of the internal combustion engine and has an exhaust gas recirculation passage for recirculating part of the exhaust gas to the intake passage;
(B) a valve seat provided in the valve housing;
(C) a valve body provided so as to be able to contact with and separate from the valve seat and changing an opening degree of the exhaust gas recirculation passage;
(D) a valve shaft that operates integrally with the valve body;
(E) driving means for driving the valve shaft in the axial direction,
(F) A flexible collar is provided on the outer periphery of the valve body in contact with the valve seat,
(G) The valve seat extends in the operation direction of the valve body and has a length equal to or longer than the operation range of the valve body, and has a plurality of protrusions that always guide the annular seal ring. Provided,
An exhaust gas recirculation device valve , wherein when the internal combustion engine is stopped, the valve element is held at a position opened by a predetermined opening from the valve seat by the operation of the driving means . The exhaust gas recirculation device valve according to claim 1 or 2, wherein the predetermined opening is an opening that is narrower than full opening. The exhaust gas recirculation device valve according to claim 1 or 2 , wherein the predetermined opening is an opening at which the internal combustion engine can be started at least . The fully closed position of the valve body, in the axial direction of the valve shaft, according to claim 1 to claim 4, characterized in that between the position and the fully open position of the valve body at the time of the internal combustion engine operation stop The exhaust gas recirculation device valve according to any one of the above. Position of the valve body at the time of the internal combustion engine operation stop, in the axial direction of the valve shaft, according to claim 1 to claim 4, characterized in that between the fully closed position and the fully open position of the valve body The exhaust gas recirculation device valve according to any one of the above. 6. The exhaust gas recirculation device valve according to claim 5 , wherein the valve body is arranged on the exhaust passage side from the valve seat . 2. The valve seat according to claim 1 , wherein an inclined portion for guiding the annular seal ring provided on the valve body or the flexible flange portion to a fully closed position of the valve body is provided on the valve seat. The exhaust gas recirculation device valve according to claim 7 . The exhaust gas recirculation device valve according to claim 1 , wherein an inclined portion is provided on an outer periphery of the annular seal ring in contact with the valve seat . The exhaust gas recirculation device valve according to claim 1 , wherein an annular groove portion is provided on an inner periphery of the valve seat, and an annular seal ring is provided in the groove portion . The exhaust gas recirculation device valve according to claim 10 , wherein an inclined portion is provided on an inner periphery of the annular seal ring in contact with the valve body .

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