JP6286969B2 - Butterfly valve device and internal combustion engine - Google Patents

Description

  The present invention relates to a butterfly valve device and an internal combustion engine, and more particularly to a butterfly valve device and an internal combustion engine that accurately control the flow rate with respect to the valve opening between a low opening and a medium opening.

  The flow characteristics of the butterfly valve device used in intake throttles, EGR valves, etc. are small in the flow rate with respect to the opening of the valve body near the beginning of opening from the fully closed state and immediately before fully opening, but the intermediate opening In the vicinity, the flow rate changes greatly with respect to the opening of the valve body.

  This is because the flow rate control is opened and closed for the cylindrical gas passage with a rotary valve of the disk, so there is little change in the flow rate with respect to the opening when the flow characteristics are fully closed and in the vicinity of the fully open, The change in flow rate is the largest in the vicinity.

  In this regard, at least one of the outer peripheral edges on both sides of the valve element in the valve opening rotation direction is a restriction wall body that maintains a gap with the inner wall surface of the valve element small at a predetermined opening or less of the valve element. There is a device that protrudes rearward (see, for example, Patent Document 1).

  This device keeps the gap small until it has passed through the part corresponding to the idle position of the valve plate, and reduces the increase rate of the opening area, so that the accelerator operation amount and the throttle valve rotation amount correspond proportionally. Even if it is, the sudden increase of the intake air quantity below the set opening is prevented.

  When performing engine intake / exhaust control and EGR valve exhaust gas flow rate control using a butterfly valve device, there is a delicate flow rate control for changes in the opening of the valve element, especially between low and medium openings. Required. However, in the above-described apparatus, it is not possible to perform delicate flow rate control with respect to the valve opening degree only by reducing the flow rate change from the low opening degree to the middle opening degree.

Japanese Patent Laid-Open No. 3-74530

  The present invention has been made in view of the above problems, and the problem is that the resolution in the flow control up to the middle opening range of the opening degree of the butterfly valve device can be increased, and the flow rate of the fluid can be increased with high accuracy. To provide a butterfly valve device and an internal combustion engine that can be controlled.

  A butterfly valve device according to the present invention for solving the above problems includes a housing in which a flow path through which a fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. A butterfly valve device in which a first valve portion in which an outflow side of a fluid is in an opening direction and a second valve portion in which an inflow side of a fluid is in an opening direction is formed on the valve body. A flow rate adjusting portion is provided on at least one of the inflow side of the first valve portion and the outflow side of the second valve portion, and the shape of the flow rate adjusting portion is within a range in which the opening degree of the valve body includes at least the middle opening degree region. In this case, the passage area of the fluid is reduced as compared with the case where the flow rate adjusting unit is not provided, and is increased so as to increase the opening of the valve body.

  Note that the intermediate opening range referred to here is an opening range between a low opening range on the fully closed side and a high opening range on the fully open side of the butterfly valve device. In addition, the flow rate adjusting portion referred to here includes a component constituted by a member formed separately from the valve element and a component constituted by the valve element itself.

  According to this configuration, by providing the flow rate adjusting unit, when the opening degree of the valve body is within a range including at least the middle opening degree region, the flow rate of the fluid increases at a stretch by a slight increase in the opening degree of the valve body. Therefore, the passage area of the fluid can be reduced as compared with the case where the flow rate adjustment unit is not provided, so that the change in the flow rate of the fluid can be reduced, and the passage area of the fluid can be reduced by opening the valve body. As the degree increases, the flow rate of the fluid can be gently increased.

  As a result, the resolution in flow control up to the middle opening range of the butterfly valve device can be increased, and the fluid flow rate can be controlled with high accuracy relative to the butterfly valve device opening up to the middle opening region. can do. Moreover, the ventilation resistance which increases by providing a flow volume adjustment part can be suppressed by making the passage area of a fluid increase gradually.

  Further, in the butterfly valve device, a distance from the rotation shaft viewed from the axial direction of the rotation shaft to an outer edge of the flow rate adjustment unit is smaller than a distance from the rotation shaft to the tip of the valve body, and If it is configured so as to decrease in the closing direction of the valve body, it is possible to increase the resolution in the flow rate control up to the middle opening range by providing a flow rate characteristic that gradually increases the flow rate change.

  In addition, in the above butterfly valve device, the flow rate adjustment unit is configured by providing a flow rate adjustment member on the inflow side of the first valve unit, and the flow rate adjustment member and the first flow rate when viewed from the axial direction of the rotation shaft. The cross-sectional shape of the one valve portion is formed radially with respect to the rotating shaft, and the length from the rotating shaft to the tip of the flow rate adjusting member is the tip of the first valve portion from the front rotating shaft. It is desirable to be configured to be shorter than the length up to.

  Further, in the butterfly valve device, an auxiliary flow rate adjusting member is provided between the flow rate adjusting member and the first valve portion, and the flow rate adjusting member and the first valve portion viewed from the axial direction of the rotating shaft, A cross-sectional shape of the auxiliary flow rate adjusting member is formed radially with respect to the rotating shaft, and a length from the rotating shaft to the tip of the auxiliary flow rate adjusting member is the first valve from the rotating shaft. It is desirable that the length is shorter than the length to the tip of the part and longer than the length from the rotating shaft to the tip of the flow rate adjusting member.

  Alternatively, in the above butterfly valve device, the flow rate adjustment unit is provided on the inflow side of the first valve unit, and the cross-sectional shapes of the flow rate adjustment unit and the first valve unit viewed from the axial direction of the rotating shaft are A fan shape that requires a rotation axis, or a triangular shape having the rotation axis as a vertex, and a distance from the rotation axis to the outer edge of the fan-shaped arc, or the rotation axis that is triangular from the rotation axis. It is desirable that the distance to the outer edge of the side opposite to be configured to be shorter in the closing direction of the valve body.

  Alternatively, in the butterfly valve device, the flow rate adjustment member is provided on the inflow side of the valve body, and the cross-sectional shape of the flow rate adjustment member and the valve body viewed from the axial direction of the rotating shaft is the second valve portion. And a distance from the rotation axis to the outer edge of the fan-shaped arc, or a fan shape that requires a contact portion between the tip portion of the flow rate adjustment member and the flow rate adjusting member, or It is desirable that the distance from the rotating shaft to the outer edge of the side facing the triangular contact portion is formed to be shorter in the closing direction of the valve body.

Alternatively, in the above butterfly valve device, the flow rate adjusting unit is configured to be formed so that the first valve unit protrudes toward the inflow side, and a cross section of the first valve unit viewed from the axial direction of the rotating shaft The shape is formed in an L shape, and the distance from the rotating shaft viewed from the axial direction of the rotating shaft to the outer edge of the side facing the rotating shaft of the first valve portion is the first valve portion. It is desirable to be configured to be shorter in the closing direction.

  Alternatively, in the above butterfly valve device, the flow rate adjusting unit is configured to be formed so that the valve body is raised on the inflow side, and the cross-sectional shape of the valve body viewed from the axial direction of the rotating shaft is L The distance to the outer edge of the side facing the tip of the second valve portion of the valve body viewed from the axial direction of the rotating shaft is toward the closing direction of the first valve portion. It is desirable to be configured to be short.

  And the internal combustion engine of this invention for solving said subject is comprised by providing the above-mentioned butterfly valve apparatus in an intake passage. According to this configuration, the intake air amount from the low opening region to the medium opening region of the opening degree of the butterfly valve device can be controlled with high accuracy with respect to the opening degree of the butterfly valve device.

  Alternatively, an internal combustion engine of the present invention for solving the above-described problems is configured by providing the above-described butterfly valve device in an EGR passage. According to this configuration, the amount of EGR from the low-opening region to the medium-opening region of the opening degree of the butterfly valve device can be controlled with high accuracy with respect to the opening degree of the butterfly valve device. Further, even if the flow rate change of the EGR amount from the low opening region to the middle opening region of the butterfly valve device is made small, the exhaust resistance can be suppressed, so that the pumping loss is reduced and the fuel consumption is reduced. Deterioration can be suppressed.

  According to the butterfly valve device and the internal combustion engine of the present invention, by providing the flow rate adjusting unit, the flow rate of the fluid increases at a stretch by the slight increase in the opening degree of the valve body up to the middle opening range of the opening degree of the valve body. Therefore, the passage area of the fluid can be reduced as compared with the case where the flow rate adjustment unit is not provided, so that the change in the flow rate of the fluid can be reduced, and the passage area of the fluid can be reduced by opening the valve body. As the degree increases, the flow rate of the fluid can be gently increased.

  As a result, the resolution in flow control up to the middle opening range of the butterfly valve device can be increased, and the fluid flow rate can be controlled with high accuracy relative to the butterfly valve device opening up to the middle opening region. can do.

It is sectional drawing which shows the butterfly valve apparatus of 1st embodiment which concerns on this invention, and shows the state at the time of a full closure. The state of the low opening area | region of the butterfly valve apparatus of FIG. 1 is shown. The state of the middle opening area | region of the butterfly valve apparatus of FIG. 1 is shown. It is sectional drawing which shows the butterfly valve apparatus of 2nd embodiment which concerns on this invention. The state of the low opening area | region of the butterfly valve apparatus of FIG. 4 is shown. The state of the middle opening area of the butterfly valve device of FIG. 4 is shown. It is a graph which shows the fluid characteristic of the butterfly valve apparatus of 1st Embodiment shown in FIG. 1, the butterfly valve apparatus of 2nd Embodiment shown in FIG. 4, and the butterfly valve apparatus of a prior art. It is sectional drawing which shows the butterfly valve apparatus of 3rd embodiment which concerns on this invention. It is sectional drawing which shows the butterfly valve apparatus of 4th embodiment which concerns on this invention. It is sectional drawing which shows the butterfly valve apparatus of 5th embodiment which concerns on this invention. It is sectional drawing which shows the butterfly valve apparatus of 6th Embodiment which concerns on this invention. It is a figure showing composition of an internal-combustion engine of an embodiment concerning the present invention.

  Hereinafter, a butterfly valve device and an internal combustion engine according to an embodiment of the present invention will be described.

  1, 4, and 8 to 11, the butterfly valve device of this embodiment is described as being provided in the intake passage of the engine (internal combustion engine), but is not necessarily provided in the intake passage. It is not limited to. For example, it may be provided in the EGR passage.

  Further, the outflow direction of the intake air in FIG. 1 is the x1 direction, the inflow direction of the intake air is the x2 direction, the vertical direction in the figure is the y direction, and the axial direction of the rotation shaft is the z direction. Therefore, the cross-sectional views in FIGS. 1 to 6 and FIGS.

  As shown in FIG. 1, the butterfly valve device 1 according to the first embodiment is provided in the middle of the intake passage P1, and functions as an intake throttle that adjusts the intake air amount of the engine. The butterfly valve device 1 includes a butterfly housing (housing) 3 in which a flow path 2 through which intake air flows is formed, a valve body 4 disposed in the flow path 2, and a rotating shaft 5 of the valve body 4. .

  As for the flow path 2, the inner walls 2a and 2b are formed in the cylindrical shape seeing from the x1 direction. The valve body 4 is formed in a disk shape when viewed from the x1 direction, and the first valve portion 6 whose opening direction is the x1 direction on the fluid outflow side with the rotary shaft 5 as a boundary, and the x2 direction on the fluid inflow side Is provided with a second valve portion 7 in the opening direction. Therefore, the first valve portion 6 side of the flow path 2 is referred to as an inner wall 2a, and the second valve portion 7 side is referred to as an inner wall 2b.

  The rotating shaft 5 has an axis in the z direction and is pivotally supported by the butterfly housing 3 and is configured to be rotated by an actuator (not shown). And the valve body 4 is joined to the rotating shaft 5, and when the rotating shaft 5 rotates, the inside of the flow path 2 rotates.

  The butterfly valve device 1 is provided with a flow rate adjusting unit 8 on the x2 direction side of the valve body 4 on the fluid inflow side, and the shape of the flow rate adjusting unit 8 is such that the opening degree of the valve body 4 is at least an intermediate opening range RM. In the case of the range including the intake air, the passage area of the intake air is reduced as compared with the case where the flow rate adjusting unit 8 is not provided, and is formed so as to increase as the opening degree of the valve body 4 increases.

  Specifically, the distance from the rotation shaft 5 to the outer edge of the flow rate adjusting unit 8 as viewed from the z direction of the rotation shaft 5 is smaller than the distance from the rotation shaft 5 to the tip of the valve body 4 and the valve body 4. It is formed so as to decrease in the closing direction.

  Specifically, the flow rate adjustment unit 8 is configured by providing a flow rate adjustment member 9 on the x2 direction side of the first valve unit 6, and the flow rate adjustment member 9 and the first flow rate adjustment member 9 viewed from the z direction in the axial direction of the rotary shaft 5. The cross-sectional shape of the single valve portion 6 is formed radially with respect to the rotating shaft 5, and the length L 1 from the rotating shaft 5 to the tip 9 a of the flow rate adjusting member 9 is the first valve portion from the rotating shaft 5. 6 is formed shorter than the length L2 up to the tip 6a.

  The flow rate adjusting member 9 is formed in a semicircular shape when viewed from the x1 direction, and is joined to the valve body 4 and the rotating shaft 5. If the surface on the inflow side of the intake air of the flow rate adjusting member 9 is formed in a flat shape or an arc shape swelled on the inflow side, the passage resistance can be suppressed.

  Further, the flow rate adjusting member 9 is such that the cross-sectional shapes of the flow rate adjusting member 9 and the first valve portion 6 viewed from the z direction are radial with respect to the rotating shaft 5, in other words, the rotating shaft 5 is the apex. It is formed in a V shape. The angle α formed by the flow rate adjusting member 9 and the first valve portion 6 can be set to a predetermined angle, and the flow rate change of the intake air can be adjusted by the size of the angle α formed.

In addition, the length L1 from the rotating shaft 5 to the tip 9a of the flow rate adjusting member 9 is formed shorter than the length L2 from the rotating shaft 5 to the tip 6a of the first valve portion 6. Furthermore, by curving the tip 9a of the flow rate adjusting member 9, it is possible to reduce the passage resistance when the intake air passes.

  In addition, by providing a space between the flow rate adjusting member 9 and the first valve unit 6, it is possible to suppress an increase in weight by providing the flow rate adjusting unit 8.

  Next, a butterfly valve device 10 according to a second embodiment of the present invention will be described with reference to FIG. In the flow rate adjusting unit 11 of the butterfly valve device 10 of the second embodiment, the angle β formed by the flow rate adjusting member 9 and the first valve unit 6 is the flow rate adjustment of the butterfly valve device 1 of the first embodiment. It is configured to be formed larger than an angle α formed by the member 9 and the first valve portion 6.

  The butterfly valve device 10 includes an auxiliary flow rate adjusting member 12 between the flow rate adjusting member 9 and the first valve unit 6, and the z-direction flow rate adjusting member 9, the first valve unit 6, and the auxiliary flow rate adjusting member 12. Is formed radially with respect to the rotary shaft 5, and the length L 3 from the rotary shaft 5 to the tip 12 a of the auxiliary flow rate adjusting member 12 is the tip of the first valve portion 6 from the rotary shaft 5. It is shorter than the length L2 up to 6a and longer than the length L1 from the rotating shaft 5 to the tip 9a of the flow rate adjusting member 9.

  The auxiliary flow rate adjusting member 12 is formed in a semicircular shape when viewed from the x1 direction, and is joined to the valve body 4, the rotating shaft 5, and the flow rate adjusting member 9. In this embodiment, a part between the auxiliary flow rate adjusting member 12 and the first valve unit 6 and a part between the auxiliary flow rate adjusting member 12 and the flow rate adjusting member 9 are formed to be filled, respectively. The present invention is not limited to this.

  In the auxiliary flow rate adjusting member 12, the cross-sectional shapes of the flow rate adjusting member 9, the first valve unit 6, and the auxiliary flow rate adjusting member 12 viewed from the z direction in the axial direction of the rotary shaft 5 are radial with respect to the rotary shaft 5. When the opening degree of the butterfly valve device 1 is in the low opening degree region RL, the auxiliary flow rate adjusting member 12 reduces the intake passage area and the intermediate opening degree range RM. The flow rate adjusting member 9 reduces the intake air passage area.

  Further, the length L3 from the rotary shaft 5 to the tip 12a of the auxiliary flow rate adjusting member 12 is shorter than the length L2 from the rotary shaft 5 to the tip 6a of the first valve portion 6, and the flow rate adjusting member 9 rotates. By making it longer than the length L1 from the shaft 5 to the tip 9a, the intake passage area is gradually increased as the opening increases from the low opening region RL to the middle opening region RM.

  Next, regarding the operation of the butterfly valve device 1 of the first embodiment and the butterfly valve device 10 of the second embodiment, FIGS. 1 to 6 and the flow characteristics of the butterfly valve device 1 and the butterfly valve device 10. The flow rate characteristics will be described with reference to FIG. The first conventional example shown in FIG. 7 shows a butterfly valve device composed only of a butterfly housing, a valve element, and a rotating shaft, and the second conventional example is the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 3-74530). 1) shows the butterfly valve device 1 of the first embodiment of FIGS. 1 to 3, and the second example of the second embodiment of FIGS. The form of the butterfly valve apparatus 10 is shown.

  FIG. 1 shows a state in which the butterfly valve device 1 of the first embodiment is fully closed. From the fully closed state shown in FIG. 1 to the opening degree θ1 shown in FIG. 2 is the low opening degree region RL shown in FIG. 7, and from the opening degree θ1 shown in FIG. 2 to the opening degree θ2 shown in FIG. 7 is a medium opening degree region RM.

As shown in FIG. 2, the butterfly valve device 1 according to the first embodiment has a passage area of intake air between the flow rate adjusting unit 8 and the flow path 2 when the opening is within the low opening region RL. This is the same as the intake passage area between the first valve section 6 and the flow path 2 when the flow rate adjusting section 8 is not provided. Therefore, as shown in FIG. 7, when the opening degree is within the low opening degree region RL, the flow rate of the intake air is the same as in the first conventional example.

  In addition, as shown in FIG. 3, the butterfly valve device 1 has an intake passage area between the flow rate adjusting unit 8 and the flow path 2 within the range of the middle opening range RM. This is smaller than the passage area of the intake air between the first valve portion 6 and the flow path 2 when 8 is not provided. Therefore, as shown in FIG. 7, the flow rate of the intake air is smaller than that of the first conventional example.

  In addition, the passage area of the intake air increases as the opening degree increases within the range of the middle opening degree region RM. Therefore, as shown in FIG. 7, the flow rate of the intake air increases more gently than the first conventional example.

  On the other hand, when this butterfly valve device 1 is compared with the second conventional example, the second conventional example suppresses the flow rate of intake air at a predetermined opening or less, and the intake flow rate suddenly increases when the opening exceeds the predetermined opening. . On the other hand, in the butterfly valve device 1, the flow rate of the intake air in the middle opening range RM increases gently without increasing rapidly.

  FIG. 4 shows a state when the butterfly valve device 10 of the second embodiment is fully closed. From the fully closed state shown in FIG. 4 to the opening degree θ1 shown in FIG. 5 is the low opening degree region RL shown in FIG. 7, and from the opening degree θ1 shown in FIG. 5 to the opening degree θ2 shown in FIG. 7 is a medium opening degree region RM.

  As shown in FIG. 5, the butterfly valve device 10 has an intake passage area between the auxiliary flow rate adjusting member 12 and the flow path 2 within the low opening range RL. This is less than the passage area of the intake air between the first valve portion 6 and the flow path 2 when no air flow is provided. Therefore, as shown in FIG. 7, when the opening degree is within the range of the low opening degree region RL, the flow rate of the intake air becomes smaller than that of the first conventional example.

  In addition, as shown in FIG. 6, the butterfly valve device 10 has an intake passage area between the flow rate adjusting member 9 and the flow path 2 within the range of the middle opening range RM. This is smaller than the passage area of the intake air between the first valve section 6 and the flow path 2 when 11 is not provided. Therefore, as shown in FIG. 7, the flow rate of the intake air becomes smaller than that of the first conventional example.

  In addition, the passage area of the intake air increases as the opening degree increases within both the low opening degree region RL and the middle opening degree region RM. Therefore, as shown in FIG. 7, the flow rate of the intake air increases more gently than the first conventional example and the second conventional example.

  As a result, according to the butterfly valve device 1 of the first embodiment and the butterfly valve device 10 of the second embodiment, the middle opening degree region RM is provided by providing the flow rate adjusting units 8 and 11 on the valve body 4. By avoiding a sudden increase in the flow rate of the intake air due to a slight increase in the opening degree of the valve body 4, the intake passage area is reduced compared with the case where the flow rate adjusting units 8 and 11 are not provided. In addition to reducing the flow rate change of the intake air, it is possible to increase the passage area of the intake air as the opening degree of the valve body 4 increases, and to smoothly change the flow rate of the fluid.

  As a result, in the first embodiment, the opening degree of the butterfly valve device 1 has a resolution in flow control in the range of the middle opening region RM, and in the second embodiment, the opening degree of the butterfly valve device 10 is low. It is possible to increase the resolution in the flow rate control in both the degree region RL and the middle opening region RM, and to control the intake air flow rate with high accuracy with respect to the opening degree of the butterfly valve devices 1 and 10. it can. Further, by increasing the flow rate of the intake air gently, an increase in the airflow resistance of the intake air can be suppressed.

Next, a butterfly valve device 20 according to a third embodiment of the present invention will be described with reference to FIG. The butterfly valve device 20 is configured such that a flow rate adjusting unit 21 is provided with a first flow rate adjusting member 22 and a second flow rate adjusting member 23 on the x2 direction side of the first valve unit 6. Further, the cross-sectional shapes of the first flow rate adjusting member 22, the second flow rate adjusting member 23, and the first valve portion 6 viewed from the z direction of the rotating shaft 5 are formed in a fan shape that requires the rotating shaft 5. In addition, the distance L4, the distance L5, and the distance L6 from the rotating shaft 5 to the outer edge of the first flow rate adjusting member 22 that forms a fan-shaped arc are the distances from the rotating shaft 5 to the tip 6a of the first valve portion 6. It is shorter than L2 and is formed shorter in order toward the x2 direction of the first valve portion 6 in the closing direction.

  The flow rate adjustment unit 21 is formed in a semi-circular shape when viewed from the x1 direction, and in the y direction so as to block between the second flow rate adjustment member 23 and the first valve unit 6. The first flow rate adjusting member 22 is formed in a shape in which both ends are narrowed when viewed from the side, and forms a fan-shaped arc.

  Next, a butterfly valve device 30 according to a fourth embodiment of the invention will be described with reference to FIG. The butterfly valve device 30 includes a flow rate adjusting unit 31 provided with a third flow rate adjusting member 33 and a fourth flow rate adjusting member 34 on the inflow side of the valve body 4 in the x2 direction. Further, the cross-sectional shape of the flow rate adjusting portion 31 and the valve body 4 as viewed from the z direction of the rotating shaft 5 is formed in a fan shape that requires the contact portion 32 between the second valve portion 7 and the flow rate adjusting portion 31. In addition, the distance L7, the distance L8, and the distance L9 from the rotation shaft 5 to the outer edge of the third flow rate adjusting member 33 forming the fan-shaped arc are from the rotation shaft 5 to the tip 6a of the first valve portion 6. It is shorter than the distance L2 and is formed shorter in order toward the x2 direction of the first valve portion 6 in the closing direction.

  The flow rate adjusting unit 31 is formed in a semicircular shape when viewed from the x1 direction, and in the y direction so as to block between the fourth flow rate adjusting member 34 and the first valve unit 6. The third flow rate adjusting member 33 is formed in a shape in which both ends are narrowed when viewed from the side, and forms a fan-shaped arc.

  Next, a butterfly valve device 40 according to a fifth embodiment of the invention will be described with reference to FIG. The butterfly valve device 40 includes a first member 42 and a second member 43 so that the flow rate adjustment unit 41 protrudes from the first valve unit 6A toward the inflow side. Further, the cross-sectional shape of the first valve portion 6A viewed from the axial direction z of the rotary shaft 5 is formed in an L shape by the first member 42 and the second member 43, and the first valve The distance L10, the distance L11, and the distance L12 to the outer edge of the first member 42 facing the rotation shaft 5 of the portion 6A are shorter than the distance L2 from the rotation shaft 5 to the tip 6Aa of the first valve portion 6A, and The one valve portion 6A is formed to be shorter in the order toward the x2 direction of the closing direction.

  The first valve portion 6A is a first member 42 having a configuration similar to that of the first flow rate adjusting member 22 constituting the flow rate adjusting portion 21 of the third embodiment and having a configuration similar to that of the second flow rate adjusting member 23. Two members 43 are provided. If it demonstrates easily, it is the structure which abolished the 1st valve part 6 of 3rd embodiment shown in FIG.

  Next, a butterfly valve device 50 according to a sixth embodiment of the invention will be described with reference to FIG. The butterfly valve device 50 includes a third member 52 and a fourth member 53 so that the flow rate adjustment unit 51 protrudes from the valve body 4B toward the inflow side. Further, the cross-sectional shape of the valve body 4B viewed from the axial direction of the rotary shaft 5 is formed in an L shape, and the second valve portion 7B of the valve body 4B viewed from the z direction in the axial direction of the rotary shaft 5 is formed. The distance L13, the distance L14, and the distance L15 to the outer edge of the third member 52 facing the tip 7Ba are shorter than the distance L2 from the rotary shaft 5 to the tip 6Ba of the first valve portion 6B, and the first valve portion 6B. It is formed shorter in order toward the x2 direction of the closing direction.

The valve body 4B includes a third member 52 having the same configuration as the third flow rate adjusting member 33 constituting the flow rate adjusting unit 31 of the fourth embodiment, and a fourth member having the same configuration as the fourth flow rate adjusting member 34. A member 53 is provided. If it demonstrates easily, it is the structure which abolished the valve body 4 of 4th embodiment shown in FIG.

  According to the third to sixth embodiments, similarly to the second embodiment, the opening amounts of the valve bodies 4, 4 </ b> A, and 4 </ b> B are provided by providing the flow rate adjusting units 21, 31, 41, and 51. Is within the range of both the low opening region RL and the middle opening region RM, avoiding a sudden increase in the intake air flow due to a slight increase in the opening of the valve bodies 4, 4A and 4B, The passage area of the intake air can be reduced as compared with the case where the flow rate adjusting units 21, 31, 41, and 51 are not provided, and the change in the intake air flow rate can be reduced. By increasing the opening degree of 4A and 4B, the flow rate change of the intake air can be made gentle.

  Therefore, the flow rate characteristics of the butterfly valve devices 20, 30, 40, and 50 of the third to sixth embodiments show the same characteristics as the second example shown in FIG.

  Next, an engine (internal combustion engine) 60 according to an embodiment of the present invention will be described with reference to FIG. As shown in the example of FIG. 12, the engine 60 includes an intake filter 63, a turbocharger (hereinafter referred to as T / C) 64 compressor 64 a and an intercooler 65 in an intake passage 62 of an engine body 61, and an exhaust passage 66. A turbine 64b of T / C 64 and an exhaust gas purification device 67 are provided. In addition, an EGR passage 68 that recirculates EGR gas from the exhaust passage 66 to the intake passage 62 and an EGR cooler 69 are provided.

  The intake passage 62 includes an intake throttle 10a formed by the butterfly valve device 10 according to the second embodiment. Further, the EGR passage 68 is provided with an EGR valve 10b formed by the butterfly valve device 10 of the second embodiment.

  According to the engine 60, the intake air amount from the low opening region RL to the intermediate opening region RM of the opening degree of the intake throttle 10a can be controlled with high accuracy with respect to the opening degree of the intake throttle 10a.

  Further, the EGR amount from the low opening region RL to the middle opening region RM of the opening degree of the EGR valve 10b can be controlled with high accuracy with respect to the opening degree of the EGR valve 10b. Further, even if the flow rate change of the EGR amount from the low opening region RL to the middle opening region RM of the opening of the EGR valve 10b is reduced, the exhaust resistance can be suppressed, so that the pumping loss is reduced, Deterioration of fuel consumption can be suppressed.

  In the above embodiment, the configuration in which the flow rate adjusting units 8, 11, 21, 31, 41, and 51 are provided on the inflow side of the first valve units 6, 6A, and 6B has been described as an example. Instead of providing on the inflow side of the valve parts 6, 6 </ b> A, and 6 </ b> B, a flow rate adjusting unit may be provided on the outflow side of the second valve parts 7 and 7 </ b> B. Further, it may be provided on both the inflow side of the first valve parts 6, 6A and 6B and the outflow side of the second valve parts 7 and 7B. In that case, the flow resistance of the fluid increases, It is good to suppress ventilation resistance by reducing the shape.

  In the butterfly valve device 1 according to the first embodiment, the cross-sectional shapes of the flow rate adjusting member 9 and the first valve portion 6 as viewed from the z direction are formed in a V shape with the rotation shaft 5 as the apex. However, it may be formed in a U shape with the rotation shaft 5 as a vertex.

In addition, in the butterfly valve device 10 of the second embodiment, one auxiliary flow rate adjusting member 12 is provided between the flow rate adjusting member 9 and the first valve unit 6, but the present invention is not limited to this. In addition, a plurality of auxiliary flow rate adjusting members may be provided. In particular, when the angle formed by the flow rate adjusting member 9 and the first valve portion 6 is larger, a smoother flow rate characteristic can be realized by providing a plurality of auxiliary flow rate adjusting members. In the case of providing a plurality of auxiliary flow rate adjusting members, the length from the rotary shaft 5 to the tip of the auxiliary flow rate adjusting member is shortened in order from the first valve portion 6 to the x2 direction on the intake inflow side. Good.

  Furthermore, in the third and fourth embodiments, the flow rate adjusting parts 21 and 31 and the first valve part 6 are formed separately, but the flow rate adjusting parts 21 and 31 and the first valve part 6 are integrated. May be formed. Further, the cross-sectional shapes of the flow rate adjusting parts 21 and 31 and the first valve part 6 as viewed from the z direction are formed in a triangular shape with the rotating shaft 5 as a vertex, and face the triangular rotating shaft 5 from the rotating shaft 5. The distance to the side may be configured to be gradually shortened in the x1 direction.

  The engine 60 of the embodiment has been described as an in-line four-cylinder diesel engine. However, the present invention can also be applied to a gasoline engine, and the number and arrangement of the cylinders and the configuration of each device are particularly limited. Not. Moreover, although the example which formed the intake throttle and EGR valve of the engine 60 with the butterfly valve apparatus 10 was demonstrated, the butterfly valve apparatuses 1, 20, 30, 40, and 50 are also applicable.

  The butterfly valve device of the present invention can increase the resolution in the flow control up to the middle opening region of the opening degree of the butterfly valve device, and can control the flow rate of the fluid with high accuracy. And can be used for EGR valves.

1, 10, 20, 30, 40, 50 Butterfly valve device 10a Intake throttle 10b EGR valve 2 Flow path 3 Butterfly housing (housing)
4, 4A, 4B Valve body 5 Rotating shaft 6, 6A, 6B First valve portion 7, 7B Second valve portion 8, 11, 21, 31, 41, 51 Flow rate adjusting portion 9 Flow rate adjusting member 12 Auxiliary flow rate adjusting member 22 First flow rate adjustment member 23 Second flow rate adjustment member 32 Contact portion 33 Third flow rate adjustment member 34 Fourth flow rate adjustment member 42 First member 43 Second member 52 Third member 53 Fourth member 60 Engine (internal combustion engine)
62 Intake passage 66 Exhaust passage 68 EGR passage

Claims (7)

A casing having a flow path through which fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. The valve body has a fluid flow with the rotation shaft as a boundary. In the butterfly valve device in which the first valve part in which the outflow side is in the opening direction and the second valve part in which the inflow side of the fluid is in the opening direction are formed,
A flow rate adjustment member provided on the inflow side of the first valve portion and a flow rate adjustment portion provided with an auxiliary flow rate adjustment member between the flow rate adjustment member and the first valve portion,
Cross-sectional shapes of the flow rate adjusting member, the first valve portion, and the auxiliary flow rate adjusting member viewed from the axial direction of the rotating shaft are formed radially with respect to the rotating shaft, and the flow rate adjusting from the rotating shaft The length to the tip of the member is shorter than the length from the rotary shaft to the tip of the first valve portion, and the length from the rotary shaft to the tip of the auxiliary flow rate adjusting member is from the rotary shaft. A butterfly valve device, wherein the butterfly valve device is formed to be shorter than a length to the tip of the first valve portion and longer than a length from the rotating shaft to the tip of the flow rate adjusting member . A casing having a flow path through which fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. The valve body has a fluid flow with the rotation shaft as a boundary. In the butterfly valve device in which the first valve part in which the outflow side is in the opening direction and the second valve part in which the inflow side of the fluid is in the opening direction are formed,
A flow rate adjustment part provided with a flow rate adjustment member on the inflow side of the first valve part ,
The cross-sectional shape of the flow rate adjusting member and the first valve portion viewed from the axial direction of the rotating shaft is formed in a fan shape that requires the rotating shaft, or a triangular shape having the rotating shaft as a vertex, The distance from the rotating shaft to the outer edge of the fan-shaped arc, or the distance from the rotating shaft to the outer edge of the side facing the triangular rotating shaft is formed shorter toward the closing direction of the first valve portion. features and to Luba Tafurai valve device Rukoto. A casing having a flow path through which fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. The valve body has a fluid flow with the rotation shaft as a boundary. In the butterfly valve device in which the first valve part in which the outflow side is in the opening direction and the second valve part in which the inflow side of the fluid is in the opening direction are formed,
A flow rate adjustment unit provided with a flow rate adjustment member on the inflow side of the valve body ,
The cross-sectional shape of the flow rate adjusting member and the valve body viewed from the axial direction of the rotating shaft is a fan shape that requires a contact portion between the tip end portion of the second valve portion and the flow rate adjusting member, or the contact portion. And the distance from the rotation axis to the outer edge of the fan-shaped arc, or the distance from the rotation axis to the outer edge of the side facing the triangular contact portion, features and to Luba Tafurai valve device to be shorter toward the closing direction of the Ichiben portion. A casing having a flow path through which fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. The valve body has a fluid flow with the rotation shaft as a boundary. In the butterfly valve device in which the first valve part in which the outflow side is in the opening direction and the second valve part in which the inflow side of the fluid is in the opening direction are formed,
The first valve portion is provided with a flow rate adjusting portion formed so as to rise to the inflow side, and the cross-sectional shape of the first valve portion viewed from the axial direction of the rotating shaft is formed in an L shape. The distance from the rotating shaft viewed from the axial direction of the rotating shaft to the outer edge of the side of the first valve portion facing the rotating shaft is formed shorter in the closing direction of the first valve portion. features and to Luba Tafurai valve device. A casing having a flow path through which fluid flows is formed, a valve body disposed in the flow path, and a rotation shaft of the valve body. The valve body has a fluid flow with the rotation shaft as a boundary. In the butterfly valve device in which the first valve part in which the outflow side is in the opening direction and the second valve part in which the inflow side of the fluid is in the opening direction are formed,
The valve body is provided with a flow rate adjusting portion formed so as to protrude from the inflow side, and the cross-sectional shape of the valve body viewed from the axial direction of the rotating shaft is formed in an L shape, and the rotating shaft the distance to the outer edge of the second valve portion side opposite to the tip of said first valve portion of the features and to Luba to be shorter toward the closed direction of the valve body seen from the axial direction of Tufly valve device. An internal combustion engine comprising the butterfly valve device according to any one of claims 1 to 5 in an intake passage. An internal combustion engine, wherein the butterfly valve device according to any one of claims 1 to 5 is provided in an EGR passage.

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