This is a national phase application filed under 35 U.S.C. 371 of PCT/JP2020/031143 filed on Aug. 18, 2020, which claims the benefit of priority from the prior Japanese Patent Application No. 2019-170217 filed on Sep. 19, 2019, the entire contents of which are incorporated herein by reference.
The present technique disclosed in this description relates to a poppet-type EGR valve to adjust a flow rate of EGR gas in an EGR passage and an EGR valve device provided with the same.
Heretofore, as this type of technique, for example, a poppet-type exhaust gas recirculation valve (EGR valve) described in the Patent Document 1 below has been known. As shown in a sectional view of
However, the EGR valve 61 described in the Patent Document 1 has a problem about a shape of the passage 62 downstream of the valve seat 64. Specifically, the passage area of the passage 62 is once increased and reduced thereafter, and increased again toward the downstream direction, and this configuration tends to cause increase in pressure loss in the passage 62. Therefore, a maximum flow rate of the EGR gas cannot be increased by that increased amount of the pressure loss. To address this, it is considered that each diameter of the valve seat 64 and the valve element 65 is increased in order to increase the maximum flow rate of the EGR gas in the passage 62, but this increase in the diameter of the valve seat 64 and the valve element 65 could cause increase in a size of the EGR valve 61.
This disclosure has been made in view of the above circumstances and has a purpose of providing an EGR valve which achieves increase in a maximum flow rate of EGR gas without increasing a frame size of an EGR valve such as increase in each diameter of a valve seat and a valve element, and an EGR valve device provided with the same.
(1) To achieve the above purpose, one aspect of the present invention provides an EGR valve of a poppet type comprising: a housing including a passage for EGR gas; a valve seat provided in the passage, the passage having an inlet and an outlet and including a bent passage portion bent orthogonally with respect to a direction toward the inlet downstream of the valve seat; a valve element allowed to be seated on the valve seat; a valve shaft provided on its one end with the valve element; and a drive unit to reciprocally drive the valve shaft; wherein the bent passage portion includes only at least any one of a portion having a passage area which is kept constant toward a downstream direction and a portion having a passage area which increases toward the downstream direction.
According to the above configuration (1), the bent passage portion configuring a passage of the housing includes only at least any one of a portion having a constant passage area toward the downstream direction and a portion increasing its passage area toward the downstream direction, and includes no portion decreasing its passage area toward the downstream direction. Therefore, pressure loss in the bent passage portion is reduced.
(2) To achieve the above purpose, in the above configuration (1), preferably, the portion increasing its passage area toward the downstream direction is configured to be gradually changed with its passage area.
According to the above configuration (2), in addition to the operation of the above configuration (1), the portion of the bent passage portion increasing its passage area toward the downstream direction is gradually changed its passage area, and accordingly, the EGR gas flows smoothly toward the downstream direction.
(3) To achieve the above purpose, in the above configuration (1) or (2), preferably, the housing is configured by resin material in at least the bent passage portion.
According to the above configuration (3), in addition to the operation of the above configuration (1) or (2), the portion of the housing at least including the bent passage portion is formed of the resin material, and thus the housing can be formed with a thin thickness as compared with a housing formed of metal material, and the housing can increase its corrosion resistance to condensed water which is to be generated in the passage.
(4) To achieve the above purpose, in any one of the above configurations (1) to (3), preferably, the passage downstream of the valve seat includes the bent passage portion and an outlet passage portion continuing into the outlet downstream of the bent passage portion, the housing includes the outlet passage portion, an outer housing having an insertion hole intersecting the outlet passage portion, and an inner housing fitted in the insertion hole of the outer housing and having the bent passage portion and an inlet passage portion continuing into the inlet upstream of the valve seat, and a sealing member is provided between the insertion hole of the outer housing and an outer circumference of the inner housing.
According to the above configuration (4), in addition to the operation of any one of the above configurations (1) to (3), the housing is configured with two bodies of the outer housing and the inner housing, and thus it is possible to give respective functions to the outer housing and the inner housing. For example, the inner housing formed of resin material can be made with a thin thickness to enlarge the passage, and the outer housing can be formed of metal material for ensuring strength. Further, the sealing member is provided between the outer housing and the inner housing, and thereby infiltration of the EGR gas between the outer housing and the inner housing can be restrained.
(5) To achieve the above purpose, preferably, there is provided a EGR valve device comprising: the EGR valve according to any one of claims 1 to 4; and an object member to be assembled with the housing of the EGR valve, wherein the object member includes an assembling hole and an other passage, and the inlet and the outlet of the housing are communicated with the other passage in a state in which the housing is assembled with the assembling hole of the object member.
According to the above configuration (5), in addition to the operations of the EGR valve according to any one of the above configurations (1) to (4), the housing of the EGR valve is assembled to the assembling hole of the object member to join the EGR valve with the object member. Accordingly, an annexed configuration for assembling is omitted from the EGR valve, so that a space can be left out by that annexed configuration. Further, the EGR valve can be commonized to be assembled to various types of object members.
According to the above configuration (1), in the EGR valve, a maximum flow rate of EGR gas can be increased without enlarging a frame size of the EGR valve by enlarging each diameter of a valve seat and a valve element, for example.
According to the above configuration (2), in the EGR valve, the maximum flow rate of the EGR gas can be increased without enlarging the frame size of the EGR valve by enlarging each diameter of the valve seat and the valve element, for example.
According to the above configuration (3), in addition to an effect of the above configuration (1) or (2), enlargement in a passage of a EGR valve and improvement in a stability of a flow rate characteristic can be achieved.
According to the above configuration (4), in addition to the effects of any one of the above configurations (1) to (3), the EGR valve can achieve ensuring a function with a minimum frame size and further achieve enlargement in the passage without enlarging the frame size of the EGR valve.
According to the above configuration (5), in addition to the effects of any one of the above configurations (1) to (4), the EGR valve can achieve enlargement in the passage by the omitted space and further achieve improvement in versability of the EGR valve to the various object members.
Some embodiments embodying an EGR valve and an EGR valve device provided with the same are explained below in detail with reference to the accompanying drawings.
Firstly, a first embodiment embodying the EGR valve is explained.
(Configuration of EGR Valve)
As shown in
As shown in
(Configuration of Passage)
As shown in
(Operations and Effects of EGR Valve)
According to the above-mentioned configuration of the EGR valve 1 of the present embodiment, the valve shaft 6 is driven with the valve element 5 by the drive unit 7 to move the valve element 5 with respect to the valve seat 4. Thus, the opening area (the open degree) between the valve seat 4 and the valve element 5 changes, so that the flow rate of the EGR gas in the passage 2 is adjusted. Herein, according to the configuration of this EGR valve 1, the bent passage portion 2a configuring the passage 2 of the housing 3 only includes the portion (the second passage position B to the fourth passage position D) increasing its passage area toward the downstream direction and the portion (the fourth passage position D to the sixth passage position F) having the constant passage area toward the downstream direction, and has no portion decreasing its passage area toward the downstream direction. Accordingly, pressure loss in the bent passage portion 2a is reduced. Therefore, as for the EGR valve 1, a maximum flow rate of the EGR gas can be increased without enlarging a frame of the EGR valve by, for example, enlarging each diameter of the valve seat 4 and the valve element 5.
According to the configuration of the present embodiment, in the portion (the second passage position B to the fourth passage position D) increasing its passage area of the bent passage portion 2a toward the downstream direction, the passage area gradually changes, and thus the EGR gas flows smoothly toward the downstream direction. In this meaning, too, as for the EGR valve 1, the maximum flow rate of the EGR gas can be increased without enlarging the frame of the EGR valve by, for example, enlarging each diameter of the valve seat 4 and the valve element 5.
Herein, when a discharge coefficient and a maximum flow rate of the EGR gas is measured as for an EGR valve in a conventional art, the discharge coefficient is “0.61” and the maximum flow rate is “720 (liter/minute)” as one example. On the other hand, when the discharge coefficient and the maximum flow rate of the EGR gas is measured with the EGR valve 1 of the present embodiment in which each diameter of the valve seat 4 and the valve element 5 is made as the same with the one in the conventional art, the discharge coefficient is “0.84” and the maximum flow rate is “890 liter/minute” as one example. Namely, in the present embodiment, the maximum flow rate can be increased by “23%” without enlarging the diameter of the valve seat 4 and the valve element 5 from the conventional art.
Further, according to the configuration of the present embodiment, the housing 3 including the passage 2 is configured by resin material, and thus the housing 3 can be made with a thin thickness as compared with a housing configured with metal material, and further, the housing 3 increases its corrosion resistance against condensed water which is to be generated in the passage 2. Therefore, it is possible to achieve enlargement in the passage 2 and improvement in the flow rate characteristics of the EGR valve 1.
Next, a second embodiment embodying an EGR valve is explained. In the following explanation, similar configuration to those of the first embodiment is assigned with the same reference signs as those in the first embodiment and their explanations are omitted, and the following explanation is made with a focus on the differences from the first embodiment.
(Configuration of EGR Valve)
As shown in
As shown in
(Configuration of Passage)
Herein, the dent 29 in the bent passage portion 2a is expediently formed in association with molding the bent passage portion 2a having a smooth inner surface by a metal die during manufacturing of the inner housing 23, and thus it is preferable to set the dent 29 with a minimum size.
(Operations and Effects of EGR Valve)
According to the above-explained configuration of the EGR valve 21 in the present embodiment, the following operations and effects can be obtained in addition to the operations and effects of the first embodiment. Namely, the housing 3 is configured by two bodies of the outer housing 22 and the inner housing 23, and thus, the outer housing 22 and the inner housing 23 can have separate functions. For example, the inner housing 23 configured by the resin material for the purpose of enlarging the passage 2 can be made with a thin thickness, and the outer housing 22 can be configured by metal material for assuring its strength. Further, there are provided the sealing members 24 and 25 between the outer housing 22 and the inner housing 23, so that intrusion of the EGR gas between the outer housing 22 and the inner housing 23 can be restrained. Therefore, the EGR valve 21 can achieve assurance of its functions with a minimum frame size, and furthermore, the passage 2 can be enlarged without enlarging the frame of the EGR valve 21.
Further, according to the configuration of the present embodiment, the housing 3 is configured with the inner housing 23 made of the resin material and the outer housing 22 made of the metal material, and thus the housing 3 can achieve weight reduction as compared with a housing which is entirely configured by the metal material. Furthermore, the inner housing 23 configuring a large portion of the passage 2 is configured with the resin material, and thus the housing 3 is increased with its corrosion resistance against the condensed water which is to be generated in the passage 2. Therefore, the EGR valve 21 can achieve weight reduction and improvement in the endurability.
Next, a third embodiment embodying an EGR valve is explained. The present embodiment is different from the first embodiment in its configuration of the housing 3.
(Configuration of EGR Valve)
Herein, as shown in
Further, as shown
As shown in
(Operations and Effects of EGR Valve)
According to the above-explained configuration of the EGR valve 21 of the present embodiment, in addition to the operations and effects of the first embodiment, the following operations and effects can be obtained. Namely, in the present embodiment, in the housing 3 configured by the resin material, the respective bolt holes 35, 37, and 39 provided for connection with an object member (the drive unit 7 or the EGR passage) are reinforced by the metal-made reinforcement pipes 36, 38, and 40. Accordingly, even when the respective flanges 31 to 33 are fastened by metal-made bolts which are inserted in the bolt holes 35, 37, and 39, respectively, endurability of the respective bolt holes 35, 37, and 39 can be enhanced, and thus reliability of fastening in the EGR valve 21 can be improved.
Next, a fourth embodiment embodying an EGR valve device including an EGR valve is explained.
(Configuration of EGR Valve Device)
This EGR valve device 41 is assembled to the EGR passage 43 in a manner that, as shown in
(Operations and Effects of EGR Valve Device)
According to the above-explained configuration of the EGR valve device 41 of the present embodiment, the EGR valve 42 can obtain the operations and the effects as similar to those of the second and third embodiments. In addition, according to the configuration of the present embodiment, the housing 3 of the EGR valve 42 is assembled to the assembling hole 43a of the EGR passage 43 (the object member), so that the EGR valve 42 is assembled to the EGR passage 43. Accordingly, an annexed configuration for assembling can be omitted from the EGR valve 42, thereby cutting a space by that annexed configuration.
Further, this EGR valve 42 can be commonized and assembled to an assembling hole of various object members. Therefore, the EGR valve 42 can achieve enlargement in the passage 2 by the amount of the cut space and also achieve improvement in multiplicity in uses of the EGR valve 42 for the various object members.
The present disclosure is not limited to the above respective embodiments and may be embodied with appropriately modifying a part of its configuration without departing from the scope of the disclosure.
(1) In the above-mentioned first embodiment, the housing 3 is configured by the resin material, but alternatively, this housing may be configured by metal material (for example, aluminum).
(2) In the above-mentioned second embodiment, the outer housing 22 is configured by the metal material and the inner housing 23 is configured by the resin material. Alternatively, both of the outer housing and the inner housing may be configured by the metal material, or both of the outer housing and the inner housing may be configured by the resin material.
(3) In the above-mentioned third embodiment, the first bolt hole 35 is reinforced by the metal-made reinforcement pipe 36, the second bolt hole 37 is reinforced by the metal-made reinforcement pipe 38, and the third bolt hole 39 is reinforced by the metal-made reinforcement pipe 50. Alternatively, the housing itself may be formed of material having high strength so that any metal-made reinforcement pipe may be omitted.
(4) In the above-mentioned fourth embodiment, the EGR valve 42 is configured to be assembled to the EGR passage 43 as the object member, but alternatively, the object member is not limited to the EGR passage, and an EGR cooler, an EGR gas distributor, and others may be adapted as the object member.
The present disclosure may be applied to a flow rate adjustment device that requires resistance to condensed water (acid resistance and alkali resistance) such as an EGR device provided in a gasoline engine and a diesel engine.
Number | Date | Country | Kind |
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2019-170217 | Sep 2019 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2020/031143 | 8/18/2020 | WO |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2021/054022 | 3/25/2021 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
3385052 | Holtermann | May 1968 | A |
3981283 | Kaufman | Sep 1976 | A |
4635609 | Seppen | Jan 1987 | A |
5511531 | Cook | Apr 1996 | A |
5611204 | Radovanovic | Mar 1997 | A |
6216458 | Alger | Apr 2001 | B1 |
10337449 | Hopf | Jul 2019 | B2 |
20010032631 | Cook | Oct 2001 | A1 |
20020023630 | Balekai | Feb 2002 | A1 |
20050199840 | Brinks | Sep 2005 | A1 |
20120167862 | Nishimori | Jul 2012 | A1 |
20140158098 | Asanuma | Jun 2014 | A1 |
20140311464 | Sano | Oct 2014 | A1 |
20150068504 | Hatano | Mar 2015 | A1 |
20150128915 | Nakamura | May 2015 | A1 |
20220333708 | Sugihara | Oct 2022 | A1 |
20220372938 | Sugihara | Nov 2022 | A1 |
20220389890 | Sugihara | Dec 2022 | A1 |
Number | Date | Country |
---|---|---|
H09-42072 | Feb 1997 | JP |
2001-355519 | Dec 2001 | JP |
2005-180379 | Jul 2005 | JP |
2005-291201 | Oct 2005 | JP |
2010-71190 | Apr 2010 | JP |
2012-219684 | Nov 2012 | JP |
2014-114715 | Jun 2014 | JP |
2014-142136 | Aug 2014 | JP |
2014-211189 | Nov 2014 | JP |
2015-017506 | Jan 2015 | JP |
2015-052283 | Mar 2015 | JP |
2015-094275 | May 2015 | JP |
2015-094328 | May 2015 | JP |
2011061795 | May 2011 | WO |
Entry |
---|
Mar. 15, 2022 International Preliminary Report on Patentability issued in Patent Application No. PCT/JP2020/031143. |
Sep. 15, 2020 International Search Report issued in Patent Application No. PCT/JP2020/031143. |
Nov. 11, 2022 Office Action issued in Japanese Patent Application No. 2019-170217. |
Nov. 22, 2023 Hearing Notice issued in Indian Application No. 202247012467. |
Number | Date | Country | |
---|---|---|---|
20220316431 A1 | Oct 2022 | US |