JP5584068B2 - EGR cooler bypass valve and EGR system - Google Patents

Description

  The present invention relates to an EGR cooler that cools EGR gas of an engine, and more particularly, to an EGR cooler bypass valve and an EGR system that switch the flow of EGR gas to the EGR cooler.

  Conventionally, as this type of technology, for example, an EGR cooler bypass valve described in Patent Document 1 below is known. The bypass valve is connected to an EGR cooler having a U-shaped passage, and an EGR gas inlet and an EGR gas outlet are formed on different surfaces. Patent Documents 2 to 4 describe related technologies.

WO2007 / 125118 JP 2010-121607 A JP 2009-257208 A Japanese Patent Laid-Open No. 2007-100522

  By the way, in the bypass valve described in Patent Document 1, surface processing is required for the connection surface with the EGR cooler and the connection surface with the gas pipe and the like. However, since the EGR gas inlet and outlet are formed on different surfaces, there are many surfaces that require processing, and the manufacturing cost tends to increase. In addition, since the piping and the like extend in two directions intersecting with each other, the mounting property on the vehicle is poor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an EGR cooler bypass valve and an EGR system which can be easily manufactured and can be mounted on a vehicle. .

In order to achieve the above object, an invention according to claim 1 is an EGR cooler bypass valve that switches a flow of EGR gas to an EGR cooler, and includes a valve housing, and an inlet for allowing EGR gas to flow into the valve housing. , An outlet through which EGR gas flows out from the valve housing, an EGR gas inflow chamber that leads to the inlet in the valve housing, a cooler-side outlet for leading EGR gas to the EGR cooler in the valve housing, and an EGR cooler in the valve housing A cooler-side inlet for introducing the EGR gas, a cooler-side passage leading to the cooler-side outlet in the valve housing, an EGR gas outlet passage disposed between the cooler-side inlet and the outlet in the valve housing, In the valve housing, between the inflow chamber and the outflow passage A bypass passage provided in the valve housing, and a valve that is switched between a state in which the inflow chamber and the cooler side passage are communicated with each other and a state in which the inflow chamber and the outflow passage are in communication with each other via the bypass passage, A valve shaft that is pivotally provided and supports the valve, a first partition that separates the cooler side passage and the outflow passage, the valve shaft is disposed on an extension line of the first partition, and the valve A first end surface formed in the housing; a second end surface formed in parallel with the first end surface at a position facing the first end surface in the valve housing; and an inlet and an outlet. The cooler side outlet and the cooler side inlet are disposed on the second end surface, the second partition wall that separates the inflow chamber and the outflow passage, and the bypass passage is formed in the second partition wall. And be a possible second partition is substantially parallel to the first partition wall, and the second partition wall is arranged to be inclined in a direction to narrow the inflow chamber toward the first partition wall The valve has an L-shaped cross section and is supported by the valve shaft at the short side of the L shape, and the valve is switched to a state in which the inflow chamber and the cooler side passage are communicated with each other. It is intended that the outer peripheral portion side of the long side in the shape is arranged so as to contact the second partition wall.

According to the configuration of the invention, the inlet and the outlet are arranged on the first end surface, and the cooler side outlet and the cooler side inlet are arranged on the second end surface. The outlet, the cooler-side outlet and the cooler-side inlet are arranged on two end surfaces, that is, the first end surface and the second end surface. Therefore, the number of end faces to which pipes and the like are attached is reduced to half of the number of ports. In addition, since the second end face is formed in parallel with the first end face at a position facing the first end face, when the pipe is connected to the first end face and the second end face, the pipe etc. The direction in which is extended becomes almost parallel. Further, when the second partition that separates the inflow chamber and the outflow passage is substantially parallel to the first partition that separates the cooler side passage and the outflow passage, the valve is L-shaped. The shape of the valve housing can be easily removed.

In order to achieve the above object, the invention according to claim 2 is the invention according to claim 1, wherein the bypass passage is formed obliquely with respect to the second partition wall.

  According to the configuration of the above invention, in addition to the operation of the invention described in claim 1, in order to post-process the bypass passage, for example, the tool is obliquely inserted from the inlet to the second partition wall. Therefore, it is not necessary to provide a work opening.

To achieve the above object, the invention according to claim 3, the EGR cooler bypass valve according to claim 1 or 2, an EGR valve for regulating the flow of EGR gas, and EGR gas pipe for flowing the EGR gas , An EGR system including an EGR cooler, wherein an EGR valve is connected to the first end surface corresponding to the outlet of the EGR cooler bypass valve via a first gasket, and the flow of the EGR cooler bypass valve An EGR gas pipe is connected to the first end surface corresponding to the inlet via a second gasket, and a third gasket is connected to the second end surface corresponding to the cooler side outlet and the cooler side inlet. The EGR cooler is connected through the network.

According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1 or 2 , the EGR valve is connected to the first end face via the first gasket corresponding to the inflow port, and corresponds to the outflow port. When the EGR gas pipe is connected to the first end face via the second gasket, and the EGR cooler is connected to the second end face via the third gasket, the EGR valve, the EGR gas pipe and the EGR The direction in which the cooler extends is almost parallel.

In order to achieve the above object, the invention described in claim 4 includes an EGR cooler bypass valve according to claim 1 , an EGR valve that regulates the flow of EGR gas, and an EGR gas pipe through which EGR gas flows. , An EGR system including an EGR cooler, wherein a flange is connected to the first end surface corresponding to the outlet and inlet of the EGR cooler bypass valve via the first gasket, corresponding to the outlet The EGR valve is connected to the flange via the second gasket, the EGR gas pipe is connected to the flange via the flange corresponding to the inlet, and the EGR valve is connected to the cooler side outlet and the cooler side inlet. The EGR cooler is connected to the end face of 2 via a third gasket.

  According to the configuration of the invention, the flange is connected to the first end surface via the first gasket corresponding to the inlet and the outlet, and the flange is connected to the flange corresponding to the outlet via the second gasket. The EGR valve is connected, the EGR gas pipe is connected via the flange, and the EGR cooler is connected via the third gasket to the second end surface corresponding to the cooler side outlet and the cooler side inlet. Sometimes, the directions in which the EGR valve, the EGR gas pipe, and the EGR cooler extend are substantially parallel. Further, the first gasket is shared for the inlet and the outlet, and the flange functions as a presser for the first gasket. A second gasket is shared for the inlet and outlet.

According to the first aspect of the invention, the manufacture of the EGR cooler bypass valve can be facilitated, and the mountability of the EGR cooler bypass valve on the vehicle can be improved. Further, the productivity of the EGR cooler bypass valve can be improved.

According to the invention described in claim 2 , in addition to the effect of the invention described in claim 1, the manufacturing cost can be reduced with a simple configuration for the EGR cooler bypass valve.

According to the invention described in claim 3 , in addition to the effect of the invention described in claim 1 or 2 , the mountability of the EGR system on the vehicle can be improved.

According to the invention described in claim 4 , in addition to the effect of the invention described in claim 1 or 2 , the mountability of the EGR system on the vehicle can be improved. In addition, the number of gaskets can be reduced.

Sectional drawing which concerns on 1st Embodiment and shows a bypass valve. Sectional drawing which shows the relationship between a valve housing and its shaping | molding metal mold | die concerning the embodiment. Sectional drawing which shows the state of the valve housing after mold shaping | molding concerning the embodiment. FIG. 4 is a cross-sectional view showing the valve housing after drilling according to the embodiment. Sectional drawing which concerns on 2nd Embodiment and shows an EGR system. Sectional drawing which concerns on 3rd Embodiment and shows an EGR system.

<First Embodiment>
Hereinafter, a first embodiment in which an EGR cooler bypass valve according to the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view of an EGR cooler bypass valve (hereinafter simply referred to as “bypass valve”) 1 of this embodiment. The bypass valve 1 is used for switching the flow of EGR gas to the EGR cooler 2. The EGR cooler 2 is for cooling the EGR gas.

  As shown in FIG. 1, the bypass valve 1 includes a metal valve housing 3, a valve shaft 4 rotatably provided on the valve housing 3, and a plate-like valve 5 supported by the valve shaft 4. Prepare. The valve housing 3 includes an inlet 11 through which the EGR gas flows into the housing 3, an outlet 12 through which the EGR gas flows out from the valve housing 3, an EGR gas inlet chamber 13 that leads to the inlet 11 in the valve housing 3, A cooler side outlet 14 for leading EGR gas to the EGR cooler 2 in the valve housing 3, a cooler side inlet 15 for introducing EGR gas from the EGR cooler 2 in the valve housing 3, and a cooler side outlet 14 in the valve housing 3. Between the cooler-side passage 16 leading to the EGR gas, the EGR gas outlet passage 17 disposed between the cooler-side inlet 15 and the outlet 12 in the valve housing 3, and between the inlet chamber 13 and the outlet passage 17 in the valve housing 3. And a bypass passage 18 disposed at the same position.

  The valve 5 provided in the valve housing 3 has an L-shaped cross section and is supported by the valve shaft 4 at the short side of the L shape. The valve shaft 4 is rotatably provided on the valve housing 3 and supports the valve 5. A step portion 24 that can be engaged with the valve 5 is formed on the inner wall of the inflow chamber 13. The valve 5 flows in through a first state where the inflow chamber 13 and the cooler side passage 16 are communicated with each other as shown by a solid line in FIG. 1, and through a bypass passage 18 as shown by a two-dot chain line in FIG. It is selectively switched to the second state in which the chamber 13 and the outflow passage 17 are communicated. The valve housing 3 is provided with a first partition wall 21 that separates the cooler side passage 16 and the outflow passage 17. The valve shaft 4 is disposed on an extension line of the first partition wall 21. The valve housing 3 is formed with a first end face 31. In the valve housing 3, a second end face 32 is formed in parallel with the first end face 31 at a position facing the first end face 31. The inflow port 11 and the outflow port 12 are respectively disposed on the first end face 31. On the other hand, the cooler side outlet 14 and the cooler side inlet 15 are respectively disposed on the second end surface 32. A cooling water passage 19 formed in the valve housing 3 is opened on the second end surface 32. Further, the valve housing 3 has a first flange 3 a formed at one end corresponding to the first end surface 31, and a second flange 3 b formed at the other end corresponding to the second end surface 32, for example. The

  The valve housing 3 is provided with a second partition wall 22 that separates the inflow chamber 13 and the outflow passage 17. The bypass passage 18 is formed in the second partition wall 22. The second partition 22 is constituted by a larger partition among the two large and small partitions branched from the first partition 21 into two branches. The smaller partition that is bifurcated forms a third partition 23. The second and third partition walls 22 and 23 are disposed substantially parallel to the first partition wall 21. Further, the bypass passage 18 is formed obliquely with respect to the second partition wall 22.

  In the first state where the inflow chamber 13 and the cooler side passage 16 are communicated with each other, the valve 5 is in contact with the wall surface of the second partition wall 22 and the bypass passage 18 is closed as shown by a solid line in FIG. Be placed. In the first state, EGR gas that has entered the inflow chamber 13 from the inlet 11 flows to the cooler side passage 16 and flows to the inlet of the EGR cooler 2 via the cooler side outlet 14. The EGR gas that has flowed through the EGR cooler 2 flows from the outlet of the cooler 2 to the outflow passage 17 via the cooler side introduction port 15 of the bypass valve 1 and flows out from the outflow port 12 to the outside. On the other hand, in the second state in which the inflow chamber 13 and the outflow passage 17 are communicated with each other via the bypass passage 18, the valve 5 abuts on the tip of the third partition wall 23 and the step 24 on the inner wall of the inflow chamber 13. The cooler side passage 16 is closed. In the second state, the EGR gas that has entered the inflow chamber 13 from the inlet 11 flows to the outflow passage 17 via the bypass passage 18 without flowing to the EGR cooler 2, and flows out from the outlet 12 to the outside.

  FIG. 2 is a sectional view showing the relationship between the valve housing 3A and the molding dies 41 and 42. As shown in FIG. FIG. 3 is a cross-sectional view showing the state of the valve housing 3A after molding. FIG. 4 is a sectional view of the valve housing 3 after drilling. The valve housing 3 is formed of a metal material such as aluminum using the first mold 41 and the second mold 42. The first mold 41 is mainly for forming the inlet 11, the inlet chamber 13, the cooler side passage 16 and the cooler side outlet 14 of the valve housing 3. The second mold 42 is mainly for molding the outlet 12, the outlet passage 17 and the cooler side inlet 15 of the valve housing 3. The first mold 41 includes an inlet 11 and an inflow chamber 13, a molding portion 41 a for molding a part of the cooler side passage 16, and a molding portion 41 b for molding a part of the outflow passage 17. It is formed. In the second mold 42, a molding part 42a for molding the cooling water passage 19, a molding part 42b for molding the remaining part of the cooler side passage 16, and a part of the outflow passage 17 are molded. A molding portion 42c is formed.

  As shown in FIG. 2, both the molds 41 and 42 are clamped, and molten metal is supplied between them, so that the first partition wall 21, the second partition wall 22, and the third partition wall 23 have a substantially Y cross section. Molded in connection with the shape. Thereafter, the molds 41 and 42 are opened to obtain the valve housing 3 in the state shown in FIG. Thereafter, the valve housing 3 in the state shown in FIG. 4 is obtained by processing the hole 25 for the valve shaft 4 and the bypass passage 18. Thereafter, the bypass shaft 1 shown by the solid line in FIG. 1 is obtained by assembling the valve shaft 4 and the valve 5 to the valve housing 3 after processing.

  According to this embodiment described above, in the valve housing 3, the inlet 11 and the outlet 12 are disposed on the first end surface 31, and the cooler-side outlet 14 and the cooler-side inlet 15 are on the second end surface 32. Be placed. That is, four ports, that is, the inlet 11, the outlet 12, the cooler-side outlet 14, and the cooler-side inlet 15 are arranged on two end surfaces, that is, the first end surface 31 and the second end surface 32. . Therefore, the number of end faces to which pipes and the like are attached is reduced to two halves with respect to the number of four ports. For this reason, manufacture of bypass valve 1 can be made easy. Moreover, since the 2nd end surface 32 is formed in parallel with the 1st end surface 31 in the position facing the 1st end surface 31, piping etc. were connected to the 1st end surface 31 and the 2nd end surface 32, respectively. Sometimes, the extending direction of the pipes and the like becomes almost parallel. For this reason, the bypass valve 1 does not become bulky, and the mounting property to the vehicle can be improved.

  In this embodiment, in the valve housing 3, the second partition wall 22 that separates the inflow chamber 13 and the outflow passage 17 is substantially parallel to the first partition wall 21 that separates the cooler side passage 16 and the outflow passage 17. However, since the second partition wall 22 is slightly inclined in the direction in which the inflow chamber 13 is narrowed, it is easy to remove the mold at the time of mold forming. On the other hand, since the L-shaped valve 5 whose valve face is offset with respect to the valve shaft 4 is used, the bypass passage 18 can be appropriately opened and closed even in the case of the valve housing shape of this embodiment. it can. For this reason, the mold forming of the valve housing 3 can be facilitated, and the productivity of the bypass valve 1 can be improved.

  Furthermore, in this embodiment, in the valve housing 3, in order to post-process the bypass passage 18, for example, it is possible to perform an operation by inserting a tool obliquely from the inlet 11 with respect to the second partition wall 22, There is no need to provide a separate opening for opening the bypass passage 18. For this reason, the valve housing 3 can be processed with a relatively simple configuration, and the manufacturing cost of the bypass valve 1 can be reduced.

Second Embodiment
Next, a second embodiment that embodies the EGR system of the present invention will be described in detail with reference to the drawings.

  FIG. 5 is a sectional view showing the EGR system 51 of this embodiment. The EGR system 51 includes the bypass valve 1 described above, an EGR valve 52 that adjusts the flow of EGR gas, an EGR gas pipe 53 that flows EGR gas, and an EGR cooler 2.

  In the EGR system 51, an EGR valve is connected to the first end surface 31 via the first gasket 54 corresponding to the outlet 12 of the bypass valve 1. In addition, an EGR gas pipe 53 is connected to the first end face 31 via the second gasket 55 corresponding to the inlet 11 of the bypass valve 1. Further, the EGR cooler 2 is connected to the second end surface 32 through the third gasket 56 corresponding to the cooler side outlet 14 and the cooler side inlet 15.

  The EGR valve 52 has a butterfly type valve 57 inside. The valve 57 is rotated about the valve shaft 58 to adjust the EGR gas flow rate.

  Therefore, in this embodiment, the EGR valve 52 is connected to the first end face 31 via the first gasket 54 corresponding to the inlet 11 of the bypass valve 1, and the first end face corresponding to the outlet 12. 31 is connected to an EGR gas pipe 53 via a second gasket 55. Further, the EGR cooler 2 is connected to the second end face 32 via a third gasket 56. At this time, the extending direction of the EGR valve 52, the EGR gas pipe 53, and the EGR cooler 2 is substantially parallel to the horizontal direction in FIG. For this reason, the EGR system 51 does not become bulky, and the mountability of the EGR system 51 on the vehicle can be improved.

<Third Embodiment>
Next, a third embodiment that embodies the EGR system of the present invention will be described in detail with reference to the drawings.

  FIG. 6 is a sectional view showing the EGR system 61 of this embodiment. The EGR system 61 includes the bypass valve 1 described above, an EGR valve 52 that adjusts the flow of EGR gas, an EGR gas pipe 53 that flows EGR gas, and an EGR cooler 2.

  In the EGR system 61, a flange 63 is connected to the first end surface 31 via a first gasket 62 corresponding to the outlet 12 and the inlet 11 of the bypass valve 1. The flange 63 is integrally provided at one end of the EGR gas pipe 53, and is formed so as to extend the flange 53a of the EGR gas pipe 53 shown in FIG. 5 in the direction of the EGR valve 52. Further, the EGR valve 52 is connected to the flange 63 via the second gasket 64 corresponding to the outflow port 12. Further, an EGR gas pipe 53 is connected to the inlet 11 via the flange 63. Further, the EGR cooler 2 is connected to the second end face 32 via the third gasket 65 corresponding to the cooler side outlet 14 and the cooler side inlet 15.

  The first gasket 62 has a shape that matches the first end surface 31. Similarly, the flange 63 has a shape that matches the first gasket 62, and thus the first end surface 31.

  Therefore, according to this embodiment, the flange 63 is connected to the first end face 31 via the first gasket 62 corresponding to the inlet 11 and the outlet 12 of the bypass valve 1, The EGR valve 52 is connected through the second gasket 64. Further, the EGR gas pipe 53 is connected through the flange 63. Furthermore, in the bypass valve 1, the EGR cooler 2 is connected to the second end surface 32 via the third gasket 65 corresponding to the cooler side outlet 14 and the cooler side inlet 15. At this time, the extending direction of the flange 63, the EGR valve 52, the EGR gas pipe 53, and the EGR cooler 2 is substantially parallel to the horizontal direction of FIG. For this reason, the EGR system 61 does not become bulky, and the mountability of the EGR system 61 on the vehicle can be improved. Further, the first gasket 62 is shared for the inlet 11 and the outlet 12, and the flange 63 functions as a presser for the first gasket 62. For this reason, the number of gaskets can be reduced.

  In the second embodiment, as shown in FIG. 5, when two gaskets 54 and 55 are arranged side by side, it is necessary to provide a space between the gaskets 54 and 55. On the other hand, in the third embodiment, as shown in FIG. 6, the first gasket 62 and the second gasket 64 are arranged vertically, so that a space in the horizontal direction can be saved. Further, in this embodiment, since there is a space in the lateral direction, there is an effect that the assembling work of the EGR valve 52 becomes easy.

  The present invention is not limited to the above-described embodiments, and a part of the configuration can be changed as appropriate without departing from the spirit of the invention.

  For example, in the second and third embodiments, the butterfly type valve 57 is provided in the EGR valve 52, but a valve other than the butterfly type may be provided in the EGR valve.

  The present invention can be applied to automobile engines.

Reference Signs List 1 Bypass valve 2 EGR cooler 3 Valve housing 3A Valve housing 4 Valve shaft 5 Valve 11 Inlet 12 Outlet 13 Inlet chamber 14 Cooler side outlet 15 Cooler side inlet 16 Cooler side passage 17 Outlet passage 18 Bypass passage 21 Partition 22 Second partition 23 Third partition 31 First end face 32 Second end face 41 First mold 42 Second mold 51 EGR system 52 EGR valve 53 EGR gas pipe 54 First gasket 55 First Second gasket 56 Third gasket 61 EGR system 62 First gasket 63 Flange 64 Second gasket 65 Third gasket

Claims (4)

An EGR cooler bypass valve that switches the flow of EGR gas to the EGR cooler,
A valve housing;
An inlet for allowing EGR gas to flow into the valve housing;
An outlet through which EGR gas flows out of the valve housing;
An EGR gas inlet chamber leading to the inlet in the valve housing;
A cooler side outlet for leading EGR gas to the EGR cooler in the valve housing;
A cooler side inlet for introducing EGR gas from the EGR cooler in the valve housing;
A cooler-side passage communicating with the cooler-side outlet in the valve housing;
An outlet passage for EGR gas disposed between the cooler side inlet and the outlet in the valve housing;
A bypass passage disposed between the inflow chamber and the outflow passage in the valve housing;
A valve provided in the valve housing, wherein the valve is switched between a state in which the inflow chamber and the cooler side passage are communicated with each other and a state in which the inflow chamber and the outflow passage are in communication with each other via the bypass passage;
A valve shaft rotatably provided in the valve housing and supporting the valve;
A first partition that separates the cooler side passage and the outflow passage;
The valve shaft is disposed on an extension of the first partition;
A first end surface formed in the valve housing;
A second end surface formed in parallel with the first end surface at a position facing the first end surface in the valve housing;
The inflow port and the outflow port are disposed on the first end surface, and the cooler side outlet and the cooler side introduction port are disposed on the second end surface;
A second partition that separates the inflow chamber and the outflow passage;
The bypass passage is formed in the second partition;
The second partition is disposed substantially parallel to the first partition;
The second partition wall is disposed so as to be inclined in a direction of narrowing the inflow chamber toward the first partition wall;
The valve has an L-shaped cross section and is supported by the valve shaft at the short side of the L shape;
The valve is arranged so that the outer peripheral side of the long side in the L-shaped cross section is in contact with the second partition wall by switching to a state in which the inflow chamber and the cooler side passage are communicated with each other. And an EGR cooler bypass valve.   The EGR cooler bypass valve according to claim 1, wherein the bypass passage is formed obliquely with respect to the second partition wall. An EGR system comprising the EGR cooler bypass valve according to claim 1, an EGR valve that adjusts the flow of EGR gas, an EGR gas pipe that flows EGR gas, and an EGR cooler,
The EGR valve is connected to the first end face corresponding to the outlet of the EGR cooler bypass valve via a first gasket, and the first end face corresponds to the inlet of the EGR cooler bypass valve. The EGR gas pipe is connected to one end face via a second gasket, and the second end face is connected to the second end face via a third gasket corresponding to the cooler side outlet and the cooler side inlet. The EGR cooler is connected to the EGR system. An EGR system comprising the EGR cooler bypass valve according to claim 1, an EGR valve that adjusts the flow of EGR gas, an EGR gas pipe that flows EGR gas, and an EGR cooler,
A flange is connected to the first end face corresponding to the outlet and the inlet of the EGR cooler bypass valve via a first gasket, and a flange is connected to the flange corresponding to the outlet. The EGR valve is connected via a gasket of No. 2, the EGR gas pipe is connected via the flange corresponding to the inlet, and the EGR valve is connected to the cooler side outlet and the cooler side inlet. The EGR system is characterized in that the EGR cooler is connected to the end face of the second end via a third gasket.

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