WO2019054393A1

WO2019054393A1 - Valve device

Info

Publication number: WO2019054393A1
Application number: PCT/JP2018/033728
Authority: WO
Inventors: 勇一朗守谷; 悠史都築
Original assignee: 株式会社デンソー
Priority date: 2017-09-15
Filing date: 2018-09-12
Publication date: 2019-03-21
Also published as: DE112018005161T5; JP2019052707A; JP6933066B2

Abstract

This valve device is provided with: a valve housing (10) having a communication space (110) which communicates with a plurality of flow passages; and valve members (20, 40, 50, 60, 70) which, when contacting an edge section (17) of an opening of one flow passage (14) of the plurality of flow passages, block the one flow passage from the communication space, the opening being formed between the one flow passage and the communication space. In at least a portion of the valve members of this valve device, the sum of the widths (Li11, Li12, Li13, Li21, Li22, Li23, Li31, Li32, Li33) of radial outer sections (21, 41, 51) of the valve members in directions along the rotation axes (RA20, RA40, RA50) and the distances (Ri221, Ri222, Ri223, Ri421, Ri422, Ri423, Ri521, Ri522, Ri523) from points on the rotation axes (RA20, RA60, RA70) of the valve members to radial outer sections (225, 235, 625, 725) of the valve members decreases along the valve closing rotation direction.

Description

Valve device

Cross-reference to related applications

This application is based on patent application number 2017-177443 filed on Sep. 15, 2017, the contents of which are incorporated herein by reference.

The present disclosure relates to a valve device.

BACKGROUND Conventionally, a valve device is known that is provided on a flow path through which fluid can flow and that can control the flow of the fluid. The valve device has a valve housing having a flow path, and a valve member rotatable in the valve housing. For example, Patent Document 1 describes a low pressure EGR device including a valve housing provided on an intake passage of an internal combustion engine and a valve member rotatably accommodated in a cylindrical valve chamber of the valve housing. There is.

JP, 2017-8870, A

In the low pressure EGR system, the flow rate of the exhaust gas discharged from the internal combustion engine and recirculated to the intake air is controlled by the rotation angle of the valve member relative to the valve housing. The exhaust gas contains moisture, and may become ice depending on the environmental conditions, thereby securing the valve housing and the valve member. For this reason, if the rotational axis of the seal portion of the valve member in contact with the edge of the opening of the valve housing and the rotational axis of the valve member in the valve housing are not coaxial, the valve member May not be able to rotate.

This indication is made in view of the above-mentioned point, and the purpose is to provide a valve device which can connect or shut off a channel certainly.

The valve device of the present disclosure comprises a valve housing and a valve member.

The valve housing has a plurality of flow paths through which fluid can flow, and a communication space communicating the plurality of flow paths.

The valve member is rotatably provided relative to the valve housing. When the valve member abuts on the edge of the opening of one flow passage formed between one flow passage of the plurality of flow passages and the communication space, the valve member shuts off the one flow passage and the communication space.

In the valve device of the present disclosure, at least the valve member is rotated in the valve rotation direction such that the valve member rotates in such a manner that the valve member is in contact with the edge of the opening after being separated from the edge of the opening. In part, the sum of the width in the direction along the axis of rotation of the radially outer portion of the valve member and the distance from the point on the axis of rotation of the valve member to the radially outer edge of the valve member It becomes shorter as it goes in the direction.

In the valve device of the present disclosure, at least a portion of the valve member has a width in a direction along the rotation axis of the radially outer portion of the valve member and a radially outer edge of the valve member from a point on the rotation axis of the valve member The sum of the distance to and the distance becomes shorter as it approaches the valve closing rotation direction. Thus, even if ice is generated between the valve housing and the valve member in a state where the valve member and the edge of the opening are in contact with each other, the valve member is closed even if ice is formed between the valve housing and the valve member. The valve member can be reliably rotated since it can move away from the ice when rotating in the direction opposite to the rotational direction. Therefore, the valve device of the present disclosure can communicate the one flow passage with the communication space, so that the flow passage can be reliably communicated or blocked.

Further, in the valve device of the present disclosure, the width in the direction along the rotation axis of at least a part of the radially outer portion narrows toward the valve closing rotation direction. Thus, even if ice is formed to fix the valve housing and the valve member in any of the directions along the rotation axis of the valve member in a state where the valve member and the edge of the opening are in contact, the valve member When it rotates in the direction opposite to the valve closing rotation direction, it can move away from the ice. Therefore, since the valve device of the present disclosure can reliably rotate the valve member and communicate the one flow passage with the communication space, the flow passage can be reliably communicated or blocked.

Further, in the valve device of the present disclosure, the distance from the point on the rotation axis of at least a part of the valve member to the radially outer edge of the valve member decreases in the valve closing rotation direction. As a result, even if ice is formed to fix the valve housing and the valve member radially outward of the valve member in a state where the valve member and the edge of the opening are in contact, the valve member rotates in the valve closing direction Can move away from the ice when rotating in the opposite direction. Therefore, in the valve device of the present disclosure, since the valve device according to the second aspect of the present disclosure can reliably rotate the valve member and communicate the one flow passage with the communication space, the flow passage can be reliably communicated or It can be shut off.

The above object and other objects, features and advantages of the present disclosure will be made more clear by the following detailed technology with reference to the attached drawings. The drawing is
FIG. 1 is a schematic view of an engine system to which a valve device according to a first embodiment is applied, FIG. 2 is an external view of the valve device according to the first embodiment, FIG. 3 is a view on arrow III in FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. FIG. 5 is a cross-sectional view when the EGR passage and the valve chamber of the valve device according to the first embodiment are in communication with each other, FIG. 6 is a cross-sectional view when the EGR passage and the valve chamber of the valve device according to the first embodiment are shut off, FIG. 7 is a perspective view of a cylinder provided in the valve device according to the first embodiment, FIG. 8 is an exploded perspective view for explaining the relationship of the combination of the cylinder and the valve member in the valve device according to the first embodiment, FIG. 9 is a side view of a valve member provided in the valve device according to the first embodiment, FIG. 10 is a top view of a valve member provided in the valve device according to the first embodiment, FIG. 11 is a schematic view for explaining the features of the valve device according to the first embodiment, Fig. 12 is a side view of a valve member provided in the valve device according to the second embodiment, FIG. 13 is a side view of a valve member provided in the valve device according to the third embodiment, FIG. 14 is a top view of a valve member provided in a valve device according to a fourth embodiment, FIG. 15 is a top view of a valve member provided in the valve device according to the fifth embodiment, FIG. 16 is a schematic view for explaining the relationship between the valve member and the cylinder provided in the valve device according to the sixth embodiment, FIG. 17 is a side view of a valve member provided in the valve device of the comparative example, FIG. 18 is a top view of a valve member provided in a valve device of a comparative example.

Hereinafter, a plurality of embodiments will be described based on the drawings.

First Embodiment
A valve device 1 according to a first embodiment will be described based on FIGS. 1 to 11. The valve device 1 is applied to an engine system 90 that generates a driving force by burning a fuel.
First, an engine system 90 will be described with reference to FIG. The engine system 90 includes an engine 91, an intake system 92, an exhaust system 93, a supercharger 94, an exhaust gas recirculation system 95, and the like. The engine 91 is a known structure in which a piston 912 is accommodated in a cylinder 911 to form a combustion chamber 910.

The intake system 92 supplies air to the engine 91 from the outside air. The intake system 92 includes an intake pipe 921, an intake manifold 922, an air cleaner 923, an intercooler 924, a throttle 925, and the like. Hereinafter, the air supplied to the engine 91 is referred to as intake air.

The intake pipe 921 is a pipe for guiding the intake air to the combustion chamber 910, and has an intake passage 920. One end of the intake pipe 921 is opened to the outside air, and the other end is connected to the intake manifold 922.
The intake manifold 922 is connected to the other end of the intake pipe 921 and the engine 91. The intake manifold 922 has a structure that branches into the same number of passages as the number of cylinders 911.
The air cleaner 923 removes foreign matter from air taken in from the atmosphere.
The intercooler 924 cools the intake air compressed and heated by the compressor 941 of the turbocharger 94.
The throttle 925 adjusts the intake amount of the engine 91. The throttle 925 is electrically connected to an electronic control unit (hereinafter referred to as "ECU") 96.

The exhaust system 93 discharges the exhaust gas emitted by the engine 91 to the outside air. The exhaust system 93 includes an exhaust pipe 931, an exhaust manifold 932, and an exhaust purification unit 933.
The exhaust pipe 931 is a pipe for guiding the exhaust of the engine 91 to the atmosphere, and has an exhaust passage 930.
An exhaust manifold 932 is connected to one end of the exhaust pipe 931 and the engine 91. The exhaust manifold 932 has a structure in which passages equal in number to the number of cylinders 911 are joined.
The exhaust purification unit 933 is provided in the exhaust pipe 931. The exhaust purification unit 933 decomposes hydrocarbons contained in the exhaust or captures particulate matter.

The supercharger 94 compresses the intake air in the intake pipe 921 using the energy of the exhaust to supercharge the intake air pressurized to the combustion chamber 910. The turbocharger 94 has a compressor 941, a turbine 942, and a shaft 943.
The compressor 941 is disposed between the air cleaner 923 and the intercooler 924 in the intake passage 920. The compressor 941 can compress intake air.
The turbine 942 is disposed between the exhaust manifold 932 and the exhaust purification unit 933 in the exhaust passage 930. The turbine 942 is rotationally driven by the energy of the exhaust.
The shaft 943 connects the compressor 941 and the turbine 942. The compressor 941 and the turbine 942 are synchronously rotated by the shaft 943.

The exhaust gas recirculation system 95 recirculates the exhaust gas after passing through the turbine 942 to the intake passage 920. The exhaust gas returned to the intake passage 920 is supplied to the combustion chamber 910 together with the air that has passed through the air cleaner 923. The exhaust gas recirculation system 95 includes an EGR pipe 951, an EGR cooler 952, and the valve device 1.

The EGR pipe 951 connects the downstream side of the exhaust gas purification unit 933 of the exhaust pipe 931 and the upstream side of the compressor 941 of the intake pipe 921. The EGR pipe 951 has an EGR passage 950 for recirculating the exhaust after passing through the turbine 942 to the air before compression by the compressor 941.
The EGR cooler 952 is provided in the EGR pipe 951. The EGR cooler 952 cools the gas passing through the EGR passage 950.
The valve device 1 is provided at a point where the EGR pipe 951 and the intake pipe 921 are connected. The valve device 1 increases or decreases the flow rate of the gas flowing into the intake passage 920 through the EGR passage 950. The valve device 1 is electrically connected to the ECU 96.

The ECU 96 is configured of a CPU as an arithmetic unit, a microcomputer having a RAM and a ROM as a storage unit, and the like. The ECU 96 controls the drive of the throttle 925 and the valve device 1 according to the driving condition of the vehicle or device on which the engine system 90 is mounted and the operation content of the operator operating the vehicle or device.

Next, the detailed configuration of the valve device 1 will be described based on FIG. 2 to FIG.
The valve device 1 is a rotary valve that can increase or decrease the degree of opening of a fluid passage by rotationally driving a cylindrical valve member. The valve device 1 can increase or decrease the opening degree of the EGR passage 950 with respect to the intake passage 920. The valve device 1 includes a valve housing 10, a valve member 20, an upper shaft 25, a lower shaft 26, a drive unit 35, a gear unit 37, and the like.

The valve housing 10 has a casing 111, a sensor cover 112, a bottom cover 113, a cylindrical member 16, a housing side seal member 17 as an "edge of the opening", and the like.
The casing 111 is formed to be able to receive the valve member 20 from a metal material such as aluminum. The casing 111 forms a joining portion of the intake passage 920 and the EGR passage 950. Specifically, as shown in FIGS. 5 and 6, the casing 111 has a valve chamber 110 as a “communication space”, an upstream flow passage 12 as a “flow passage”, and a downstream flow passage as a “flow passage”. 13 and the accommodation space 14 as "one flow path".

The valve chamber 110 is formed to be able to rotatably accommodate the valve member 20.
The upstream flow passage 12 is formed to communicate with the valve chamber 110. The upstream side flow passage 12 communicates with the air cleaner 923.
The downstream flow passage 13 is formed to communicate with the valve chamber 110 separately from the upstream flow passage 12. The downstream side flow passage 13 is formed coaxially with the upstream side flow passage 12. The downstream flow passage 13 communicates with the intercooler 924.
The accommodation space 14 is formed to communicate with the valve chamber 110 separately from the upstream flow passage 12 and the downstream flow passage 13. The accommodation space 14 is formed so as to be able to accommodate the cylindrical member 16 in which the housing-side seal member 17 is assembled. The storage space 14 communicates with the EGR passage 950.

The casing 111 has a wall 114 forming a valve chamber 110, as shown in FIG. The wall body 114 has a through hole 101 through which the upper shaft 25 is inserted. A bearing 102 and an oil seal 103 are provided on the inner wall forming the through hole 101 of the wall 114. The bearing 102 rotatably supports the upper shaft 25. The oil seal 103 prevents the gas in the valve chamber 110 from flowing out through the through hole 101 to the outside of the valve chamber 110.

The sensor cover 112 is provided on the opposite side of the valve chamber 110 as viewed from the wall 114 of the casing 111. The sensor cover 112 forms an accommodation space 370 capable of accommodating the drive unit 35, the gear unit 37, and the like together with the casing 111.

The bottom cover 113 is provided on the side of the casing 111 opposite to the side on which the sensor cover 112 is provided. The bottom cover 113 forms a valve chamber 110 together with the casing 111. The bottom cover 113 has a through hole 104 into which the lower shaft 26 can be inserted. A bearing 105 is provided on the inner wall of the bottom cover 113 forming the through hole 104.

The cylindrical member 16 is a member provided separately from the casing 111. The cylindrical member 16 has a flange portion 161, a first side wall portion 162, and a second side wall portion 163. The cylindrical member 16 is formed of stainless steel.

The flange portion 161 is a portion formed in a substantially annular shape. When the cylindrical member 16 is accommodated in the accommodation space 14, the flange portion 161 abuts on a step surface 141 provided on the inner wall forming the accommodation space 14 as shown in FIGS. At this time, the cylindrical member 16 is fixed to the casing 111 by press-fitting the annular ring 191 into the casing 111. The ring 191 presses the flange portion 161 against the step surface 141 via the wave washer 192.

The first side wall portion 162 and the second side wall portion 163 are formed to extend along the axial direction of the flange portion 161 from the end face in contact with the step surface 141 of the flange portion 161. The first side wall portion 162 and the second side wall portion 163 are formed to have the same shape as a part of the side wall of the cylinder. In the first embodiment, the first side wall portion 162 and the second side wall portion 163 are formed to have a central angle of 180 degrees. The first side wall portion 162 is formed such that the height extending in the axial direction of the flange portion 161 is lower than the height extending in the axial direction of the flange portion 161 of the second side wall portion 163.

The housing-side seal member 17 has a first covering portion 171, a first sealing lip portion 172, a second covering portion 173, and a second sealing lip portion 174. The housing side sealing member 17 is formed in a substantially cylindrical shape from an elastic material such as rubber.

The first covering portion 171 is formed to cover the radially inner side, the radial outer side, and the end portion of the first side wall portion 162 opposite to the flange portion 161 side.
The first seal lip portion 172 is a lip-like portion provided at a portion covering the end portion of the first covering portion 171 opposite to the flange portion 161 side. When the first covering portion 171 is provided to cover the first side wall portion 162, the first seal lip portion 172, as shown in FIGS. It is formed to project radially outward of the portion 161.

The second covering portion 173 is a portion connected to the radially inner side and the radially outer side of the second side wall portion 163, the end opposite to the flange portion 161 side, and the first side wall portion 162 of the second side wall portion 163. It is formed to cover the end face of As shown in FIG. 7, the second cover portion 173 has seal surfaces 175 and 176 facing in the circumferential direction of the housing side seal member 17 at a portion covering the end face of the portion connected to the first side wall portion 162. The seal surfaces 175 and 176 are connected to the first seal lip portion 172.
The second seal lip portion 174 is a lip-like portion provided at a portion covering the end portion of the second covering portion 173 opposite to the flange portion 161 side. When the second covering portion 173 is provided to cover the second side wall portion 163, as shown in FIG. 7, the second seal lip portion 174 has a radially inward direction of the second side wall portion 163, that is, a diameter of the flange portion 161. It is formed to project inward. The second seal lip portion 174 is connected to the seal surfaces 175 and 176.
Hereinafter, as shown in FIG. 7, a member in which the housing side seal member 17 and the cylindrical member 16 are combined is referred to as a cylindrical body 15.

The valve member 20 has a valve member side seal portion 21 as the “radial direction outer portion of the valve member”, an upper arm 22 and a lower arm 23. The valve member 20 is formed of a resin material having high heat resistance, such as polyphenylene sulfide. As shown in FIGS. 5 and 6, the valve member 20 is accommodated in the valve chamber 110 and is provided so as to be rotatable relative to the valve housing 10 (see solid arrow R5 in FIG. 5 and solid arrow R6 in FIG. 6). ). Here, with regard to the rotational direction of the valve member 20, for convenience, the direction of rotation from the state of FIG. 5 to the state of FIG. 6 is referred to as "EGR passage shut-off direction" as "valve closing rotational direction" The direction of rotation from the state of FIG. 5 to the state of FIG. 5 is referred to as the “EGR passage opening direction” as “the direction opposite to the valve closing rotation direction”.

The valve member side seal portion 21 is provided radially outward of the valve member 20 as viewed from the rotation axis RA 20 of the valve member 20. The valve member side seal portion 21 is formed such that the outer wall surface 211 which can contact the housing side seal member 17 has the same shape as a part of the wall surface on the radially outer side of the cylinder. The outer wall surface 211 has seal surfaces 212 and 213 and connection seal surfaces 214 and 215, as shown in FIGS.

The seal surfaces 212 and 213 are formed on the outer wall surface 211 in the circumferential direction of the valve member side seal portion 21.
The seal surface 212 is formed on the outer wall surface 211 so as to be directed in the EGR passage blocking direction. The seal surface 212 has the same shape as a part of the inner wall surface of the radially outer side wall of the cylinder. In the first embodiment, the sealing surface 212 has a semi-cylindrical shape with a central angle of 180 degrees. The sealing surface 212 is formed such that the radius is larger than the radius of the sealing surface 213. The seal surface 212 is formed to be able to abut on the first seal lip portion 172.
The seal surface 213 is formed on the outer wall surface 211 so as to be directed in the EGR passage blocking direction. The sealing surface 213 has the same shape as a part of the outer wall surface of the radially outer side wall of the cylinder. In the first embodiment, the seal surface 213 has a semi-cylindrical shape with a central angle of 180 degrees. The seal surface 213 is formed to be able to abut on the second seal lip portion 174.
The virtual cylindrical surface including the sealing surface 212 and the virtual cylindrical surface including the sealing surface 213 have a central axis coaxially. The central axis is orthogonal to the rotation axis RA20 of the valve member 20.

The connection seal surfaces 214 and 215 are formed on the outer wall surface 211 in the EGR passage blocking direction. The connection sealing surfaces 214, 215 are formed to be orthogonal to the sealing surfaces 212, 213. The normal of the connecting sealing

surfaces

214, 215 can be orthogonal to the rotational axis RA20 of the valve member 20 when translated.
The connection seal surface 214 is located on the upper arm 22 side in the portion where the seal surface 212 and the seal surface 213 are connected, as shown in FIG. 8. The connection seal surface 214 is formed to be able to abut on the seal surface 175.
The connection seal surface 215 is located on the lower arm 23 side in the portion where the seal surface 212 and the seal surface 213 are connected, as shown in FIG. The connection seal surface 215 is formed to be able to abut on the seal surface 176.

In the first embodiment, the valve member side seal portion 21 is formed such that the length in the direction along the rotation axis RA20 becomes shorter as it goes in the EGR passage blocking direction. Then, the shape of the valve member side seal part 21 is demonstrated based on FIG. FIG. 9 shows a side view of the valve member 20. In FIG. 9, the rotation direction when the valve member 20 is assembled to the valve housing 10 is indicated by a solid arrow.

Specifically, as shown in FIG. 9, in the valve member side seal portion 21, the length Li11 in the direction along the rotation axis RA20 of the end portion 216 positioned on the EGR passage blocking direction side is positioned on the EGR passage opening direction side. The length of the end 217 in the direction along the rotation axis RA20 is shorter than the length Li12. Further, in the valve member side seal portion 21, a length Li13 in a direction along the rotation axis RA20 of the intermediate portion 218 located equidistant from each of the end portion 216 and the end portion 217 corresponds to the length Li11 of the end portion 216. It is relatively long and short compared to the length Li12 of the end portion 217. In the first embodiment, the lengths Li11, Li12, and Li13 satisfy the following relational expression (1).
Li12-Li13 = Li13-Li11 (1)
In the first embodiment, the values on the right side and the left side of Expression (1) are relatively small values.
The valve member 20 is connected to the edge 225 as the “radially outer edge of the valve member” connected to the valve member side seal portion 21 of the upper arm 22 and to the valve member side seal portion 21 of the lower arm 23 The edge 235 as the radially outer edge of the member is formed straight in the side view shown in FIG.

When the valve member 20 rotates in the EGR passage opening direction and becomes the state shown in FIG. 5, the EGR which communicates with the valve chamber 110 to the accommodation space 14 while squeezing the upstream side flow passage 12 to the valve chamber 110 to the minimum. Open the passage 950 as much as possible.
When the valve member 20 rotates in the EGR passage blocking direction to be in the state shown in FIG. 6, the first seal lip portion 172 abuts on the seal surface 212 and the second seal lip portion 174 abuts on the seal surface 213. Further, each of the seal surfaces 175 and 176 abuts on each of the connection seal surfaces 214 and 215. Thus, the upstream side flow passage 12 is maximally opened with respect to the valve chamber 110 while the valve chamber 110 and the EGR passage 950 are shut off.

Further, in the first embodiment, by controlling the rotation angle of the valve member 20, it is possible to increase / decrease the opening degree of the intake passage 920 as well as the opening degree of the EGR passage 950 with respect to the intake passage 920. Thus, the magnitude of the negative pressure in the intake passage 920 can be controlled. For example, instead of utilizing the negative pressure generated by the engine 91, the intake valve 920 flows into the intake passage 920 by controlling the rotation angle of the valve member 20. Can be controlled.

The upper arm 22 is provided at an end of the valve member side seal portion 21 in the direction along the rotation axis RA 20 at an end on the sensor cover 112 side. The upper arm 22 has an upper connection portion 221 and an upper fastening portion 222.
The upper connection portion 221 is provided at an end of the valve member side seal portion 21 on the sensor cover 112 side. The upper connection portion 221 is formed such that the outer wall surface 223 is inclined with respect to the rotation axis RA20 as shown in FIGS. Specifically, it is formed to be closer to the rotation axis RA20 as it goes from the end on the valve member side seal portion 21 side to the end on the upper fastening portion 222 side. A water repellent film is formed on the outer wall surface 223.
The upper fastening portion 222 is a direction from the end opposite to the side connected to the valve member side seal portion 21 of the upper connection portion 221 toward the rotation axis RA20 of the valve member 20, that is, the substantially cylindrical valve member 20 It is a portion formed to extend radially inward. The upper fastening portion 222 has a through hole 224 into which the upper shaft 25 is press-fitted at an end opposite to the side connected to the upper connection portion 221.
In FIG. 4, for convenience, boundary lines between the valve member side seal portion 21 and the upper connection portion 221 and the upper connection portion 221 and the upper fastening portion 222 are indicated by two-dot chain line VLI11 and VL12.

The lower arm 23 is provided at an end of the valve member side seal portion 21 in the direction along the rotation axis RA 20 at an end on the bottom cover 113 side. The lower arm 23 has a lower connection portion 231 and a lower fastening portion 232.
The lower connection portion 231 is provided at an end portion of the valve member side seal portion 21 on the bottom cover 113 side. As shown in FIG. 4, the lower connection portion 231 is formed such that the outer wall surface 233 is inclined with respect to the rotation axis RA20. Specifically, it is formed to be closer to the rotation axis RA20 as it goes from the end on the valve member side seal portion 21 side to the end on the lower fastening portion 232 side. A water repellent film is formed on the outer wall surface 233.
The lower fastening portion 232 is a portion formed to extend in the radial inward direction of the valve member 20 from an end portion of the lower connection portion 231 opposite to the side connected to the valve member side seal portion 21. The lower fastening portion 232 has a through hole 234 into which the lower shaft 26 is press-fitted at an end opposite to the side connected to the lower connection portion 231.
In FIG. 4, for convenience, boundary lines between the valve member side seal portion 21 and the lower connection portion 231 and the lower connection portion 231 and the lower fastening portion 232 are indicated by two-dot chain lines VL13 and VL14.

In the first embodiment, the upper arm 22 and the lower arm 23 are formed such that the radial length of the valve member 20 becomes shorter as it goes in the EGR passage blocking direction. Therefore, the shape of the upper arm 22 will be described based on FIG. FIG. 10 shows a top view of the valve member 20 assembled to the valve housing 10 as viewed from the sensor cover 112 side. In FIG. 10, the rotational direction when the valve member 20 is assembled to the valve housing 10 is indicated by a solid arrow. Here, only the shape of the upper arm 22 will be described, but the lower arm 23 has a similar shape. In FIG. 10, the scale of the valve member 20 in the radial direction is changed in order to make the shape of the upper arm 22 intelligible.

In the valve member 20, the upper arm 22 is formed such that the radial length of the valve member 20 becomes shorter as it goes in the EGR passage blocking direction. Specifically, as shown in FIG. 10, a point P25 on the rotation axis RA20 is set. Moreover, in FIG. 10, the edge 225 of the upper arm 22 overlaps with the outer wall surface 211 of the valve member side seal part 21 (curve 225 of FIG. 10).
In this case, as shown in FIG. 10, in the upper arm 22, the distance Ri221 between the point P226 located closest to the EGR passage cut-off direction on the edge 225 and the point P25 is the most open direction of the EGR passage on the edge 225 The distance Ri222 between the point P227 located on the side and the point P25 is shorter than the distance Ri222. Further, as shown in FIG. 10, a distance Ri223 between the point P228 and the point P25, which is a point on the edge 225 and the central angle formed with the point P226 and the central angle formed with the point P227 are the same angle α1. Is longer than the distance Ri221 and shorter than the distance Ri222. In the first embodiment, the following relational expression (2) is established for the distances Ri221, Ri222, and Ri223.
Ri222-Ri223 = Ri223-Ri221 (2)
In the valve member 20, the edge 225 and the edge 235 are formed in a curved shape in the top view shown in FIG.
In FIG. 10, a virtual line which is a set of points at the same distance from the point P25 as the distance Ri221 is indicated by a virtual line VL10.

The upper shaft 25 is a substantially rod-like member formed of stainless steel. The upper shaft 25 is rotatably provided integrally with the valve member 20 by being fastened to the upper fastening portion 222. The upper shaft 25 is formed to extend from the end of the upper arm 22 on the rotation axis RA 20 in the direction opposite to the lower shaft 26, as shown in FIG. The upper shaft 25 is inserted into the through hole 101 of the casing 111, and is rotatably supported by the bearing 102 while being inserted into the oil seal 103.

The lower shaft 26 is a substantially rod-like member formed of stainless steel. The lower shaft 26 is rotatably provided integrally with the valve member 20 by being fastened to the lower fastening portion 232. The lower shaft 26 is formed to extend from the end of the lower arm 23 on the rotation axis RA 20 in a direction opposite to the upper arm 22 as shown in FIG. 4. The lower shaft 26 is inserted into the through hole 104 of the bottom cover 113 and rotatably supported by the bearing 105. The lower shaft 26 is provided such that the upper shaft 25 and the rotation axis are coaxial.

The driving unit 35 is, for example, a direct current motor having a sliding contact structure between a brush and a commutator. The drive unit 35 is electrically connected to the ECU 96 through the connector 115 of the valve housing 10. The driving unit 35 generates a driving force capable of rotating the valve member 20 under the control of the ECU 96.

The gear portion 37 has a plurality of gears, amplifies the torque of the drive portion 35 according to the reduction ratio, and transmits the amplified torque to the upper shaft 25. The gear portion 37 has a pinion gear 371, an intermediate reduction gear 372, a small diameter gear 373, and a valve gear 374.
The pinion gear 371 is attached to the output shaft of the drive unit 35.
The intermediate reduction gear 372 meshes with the pinion gear 371.
The small diameter gear 373 is supported by the central axis common to the intermediate reduction gear 372 and rotates integrally with the intermediate reduction gear 372.
The valve gear 374 is provided to mesh with the small diameter gear 373. The valve gear 374 has, for example, a larger outer diameter than the upper shaft 25 and rotates integrally with the upper shaft 25. Between the valve gear 374 and the casing 111, a return spring 39 is provided which biases the valve member 20 to rotate the valve member 20 in the EGR passage blocking direction.

The detection unit 38 has a magnet 381 and a Hall IC 382.
The magnet 381 is fixed to the valve gear 374 and rotates with the upper shaft 25 and the valve gear 374.
The Hall IC 382 is provided on the sensor cover 112. The Hall IC 382 outputs an electrical signal corresponding to the magnetic flux density of the magnetic field generated by the magnet 381 via the connector 115 to the ECU 96. The ECU 96 performs feedback control of the energization amount of the drive unit 35 such that the rotation angle of the valve member 20 detected by the detection unit 38 matches the target value. The target value of the rotation angle is set according to the operating state of the engine system 90.

Here, in describing the effect of the valve device 1 according to the first embodiment, the shape of the valve member 80 provided in the valve device of the comparative example shown in FIGS. 17 and 18 will be described. The valve member 80 has a valve member side seal portion 81 that can be in contact with the housing side seal member provided in the valve device of the comparative example. Like the valve device 1 according to the first embodiment, the valve member side seal portion 81 has a plurality of seal surfaces and is formed to have the same shape as a part of the wall surface on the radially outer side of the cylinder.

In the valve member 80, the valve member side seal portion 81 is formed such that the length of the valve member 80 in the direction along the rotation axis RA80 becomes longer as it goes in the EGR passage blocking direction. Specifically, as shown in FIG. 17, in the valve member side seal portion 81, the length Lo81 in the direction along the rotation axis RA80 of the end portion 816 located on the EGR passage blocking direction side is located on the EGR passage opening direction side. The length Lo 82 is shorter than the length Lo 82 in the direction along the rotation axis RA 80 of the end portion 817. In the valve member side seal portion 81, the length Lo83 in the direction along the rotation axis RA80 of the intermediate portion 818 located equidistant from each of the end 816 and the end 817 corresponds to the length Lo81 of the end 816 The length is shorter than the length L82 of the end portion 817.

Further, as shown in FIG. 18 which is a top view of the valve member 80, the valve member 80 provided in the valve device of the comparative example has the upper arm 82 of the valve member 80 in the valve member 80 in the EGR passage blocking direction. It is formed so that the length of the diameter direction of may be fixed.
Specifically, as shown in FIG. 18, a point P85 on the rotation axis RA80 is set. A portion (curve 825 in FIG. 18) of the upper arm 82 overlapping the outer wall surface of the valve member side seal portion 81 in the radial direction in the direction along the rotation axis RA80 is referred to as an edge portion 825.
In this case, as shown in FIG. 18, the upper arm 82 is positioned at a distance Ro 821 between the point P 826 located closest to the EGR passage cut-off direction of the edge 825 and the point P 85 and at the EGR passage open direction side of the edge 825 The distance Ro 822 between the point P 827 and the point P 85 is the same. Also, as shown in FIG. 18, the distance Ro 823 between the point P 828 and the point P 85 is a point on the edge 825 and the central angle forming the point P 826 and the central angle formed with the point P 827 are the same angle α 2 , The distance Ro 821 and the distance Ro 822 are the same.

In the valve device of the comparative example, when the valve member 80 and the valve housing are in contact and the EGR passage and the valve chamber are shut off, ice may adhere to the valve member 80 if water contained in the gas coagulates (for example, (Areas of two-dot chain lines A 82 and A 83 shown in FIG. 17 and areas of two-dot chain line A 81 shown in FIG. 18). When the ice adheres to the valve member 80 and the valve housing, the ice prevents the valve member 80 from rotating in the direction of opening the EGR passage.

(A) FIG. 11 shows a schematic view of a valve member 20 provided in the valve device 1 according to the first embodiment. In FIG. 11, the shapes of the valve member 20 provided with the upper shaft 25 and the lower shaft 26 are simplified, and the external shapes of the end portion on the EGR passage blocking direction side and the end portion on the EGR passage opening direction side are shown. . In FIG. 11, the external shape of the end on the EGR passage blocking direction side of the valve member 20 is a point P25 on the rotation axis RA20, a point P11, a point P12, a point P13, a point P14, and a point P35 on the rotation axis RA20. It is shown. In this case, the end of the valve member 20 on the EGR passage closing direction side has a width Li11 in the direction along the rotation axis RA20 of the valve member side seal portion 21 and the edge from the point P25, 35 on the rotation axis RA20 The distance up to 225 is the distance Ri221. On the other hand, the external shape of the end on the EGR passage opening direction side of the valve member 20 is indicated by a point P25, a point P21, a point P22, a point P23, a point P14 on the rotation axis RA20 and a point P35 on the rotation axis RA20. ing. In this case, the end of the valve member 20 on the EGR passage opening direction side has a width Li12 in the direction along the rotation axis RA20 of the valve member side seal portion 21 and the edge from the point P25, 35 on the rotation axis RA20 The distance up to 225 is the distance Ri222.
Thus, the valve member 20 has a width in the direction along the rotation axis RA20 of the valve member side seal portion 21 and a radially outer edge of the valve member 20 from the points P25 and P35 on the rotation axis RA20 of the valve member 20 The sum of the distances to 225 and 235 becomes shorter as it approaches the EGR passage blocking direction. Therefore, as the valve member 20 goes in the EGR passage blocking direction, the outer shape becomes smaller as shown by white arrows S21, S22 and S23 shown in FIG. As a result, even if ice is formed between the valve member 20 and the valve housing 10 to secure the valve member 20 and the valve housing 10 when the EGR passage 950 and the valve chamber 110 are shut off, Since the valve 20 can move in the direction away from the ice when it rotates in the EGR passage opening direction, the valve member 20 can be rotated reliably. Therefore, the valve device 1 according to the first embodiment can reliably communicate the intake passage 920 with the EGR passage 950.

(B) In the valve device 1, the valve member side seal portion 21 is formed such that the length in the direction along the rotation axis RA20 becomes shorter as it goes in the EGR passage blocking direction. Thus, when the valve member 20 rotates in the EGR passage opening direction, the valve member 20 adheres to either or both of the directions along the rotation axis RA20 of the valve member 20 (for example, the regions A22 and A23 in FIG. 9). The rotation of the valve member 20 is not impeded by the ice as it moves away from the ice. Therefore, the valve device 1 according to the first embodiment can reliably rotate the valve member 20 without being affected by the ice attached in the direction along the rotation axis RA20 of the valve member 20.

(C) Further, in the valve device 1, the upper arm 22 is formed such that the radial length of the valve member 20 becomes shorter as it goes in the EGR passage blocking direction. Thus, when the valve member 20 rotates in the EGR passage opening direction, the valve member 20 moves in a direction away from the ice adhering to the radially outward direction of the valve member 20 (for example, the area A21 in FIG. 10). The rotation of the valve member 20 is not impeded by the ice. Therefore, the valve device 1 according to the first embodiment can reliably rotate the valve member 20 without being affected by the ice adhering to the radially outward direction of the valve member 20.

(D) The values on the right side and the left side of equation (1) are relatively small values. That is, the inclination with respect to the rotation direction of the valve member 20 of the edge part 225 of the upper arm 22 connected to the valve member side seal part 21 is a comparatively small inclination. Thereby, since the ice adhering to the valve member 20 and the valve member 20 can be released by shearing, the adhesion between the valve member 20 and the valve housing 10 by ice is released by a relatively small rotational torque. be able to.

(E) The edge 225 of the upper arm 22 is formed to satisfy the relationship of equation (1). That is, the valve member 20 is formed such that the length of the valve member side seal portion 21 in the direction along the rotation axis RA 20 changes at a constant rate. As a result, the shape of the valve member 20 is relatively simple, so that the valve member 20 can be manufactured relatively easily.

(F) A water repellent film is formed on the outer wall surfaces 223 and 233 where ice may adhere. As a result, it is difficult for water contained in the exhaust gas to adhere, so it is difficult for ice to form in the regions A21, A22, A23 and the like. Therefore, the valve member 20 and the valve housing 10 are less likely to adhere to each other due to the ice, so that when the valve member 20 rotates in the EGR passage opening direction, the valve member 20 can be reliably rotated.

Second Embodiment
Next, a valve device according to a second embodiment will be described based on FIG. The second embodiment differs from the first embodiment in the shape of the valve member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

The valve device according to the second embodiment includes a valve housing 10, a valve member 40, an upper shaft 25, a lower shaft 26, a drive portion 35, a gear portion 37 and the like.

The valve member 40 has a valve member side seal portion 41 as the “radial direction outer portion of the valve member”, an upper arm 22 and a lower arm 23. The valve member 40 is formed of a resin material having high heat resistance, for example, polyphenylene sulfide. The valve member 40 is accommodated in the valve chamber 110 and provided so as to be rotatable relative to the valve housing 10.

The valve member side seal portion 41 is provided radially outward of the valve member 40 as viewed from the rotation axis RA 40 of the valve member 40. The valve member side seal portion 41 is formed such that the outer wall surface 411 which can contact the housing side seal member 17 has the same shape as a part of the wall surface on the radially outer side of the cylinder. The outer wall surface 411 has seal surfaces 412 and 413 and connection seal surfaces 414 and 415, as shown in FIG. The locations and shapes where the seal surfaces 412 and 413 and the connection seal surfaces 414 and 415 are arranged are the same as the seal surfaces 212 and 213 and the connection seal surfaces 214 and 215 of the first embodiment.

In the second embodiment, the valve member side seal portion 41 is formed such that the length in the direction along the rotation axis RA40 becomes shorter as it goes in the EGR passage blocking direction.
Specifically, as shown in FIG. 12 which is a side view of the valve member 40, the valve member side seal portion 41 has a length Li21 in the direction along the rotation axis RA40 of the end portion 416 located on the EGR passage blocking direction side. Is shorter than a length Li22 in a direction along the rotation axis RA40 of the end portion 417 positioned on the EGR passage opening direction side. Further, in the valve member side seal portion 41, the length Li23 in the direction along the rotation axis RA40 of the intermediate portion 418 located equidistant from each of the end portion 416 and the end portion 417 corresponds to the length Li21 of the end portion 416. It is relatively long and short compared to the length Li22 of the end 417. In the second embodiment, the lengths Li21, Li22, and Li23 satisfy the following relational expression (3).
Li22-Li23 <Li23-Li21 (3)
In the valve member 40, an edge portion 225 connected to the valve member side seal portion 41 of the upper arm 22 and an edge portion 235 connected to the valve member side seal portion 41 of the lower arm 23 are curved in the top view shown in FIG. It is formed.

In the valve device according to the second embodiment, the valve member side seal portion 41 is formed such that the length in the direction along the rotation axis RA40 becomes shorter as it goes in the EGR passage blocking direction. Thus, the second embodiment exhibits the effects (a) to (c) and (f) of the first embodiment.

Further, in the valve device according to the second embodiment, the change in length in the direction along the rotation axis RA40 from the intermediate portion 418 to the end portion 416 located on the EGR passage blocking direction side across the intermediate portion 418 is the intermediate portion. The rate of change is larger than the change in length in the direction along the rotation axis RA40 from the point 418 to the end 417 positioned on the EGR passage open direction side. As a result, the adhesion between the intermediate portion 418 and the end portion 417 is released by shearing while the adhesion between the intermediate portion 418 and the end portion 416 is released by pulling. Thus, by making the change in length in the direction along the rotation axis RA40 from the intermediate portion 418 to the end portion 416 relatively large, the size of the valve member 20 is reduced while the adhesion with ice is reliably released. be able to.

Third Embodiment
Next, a valve device according to a third embodiment will be described based on FIG. The third embodiment differs from the first embodiment in the shape of the valve member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

The valve device according to the third embodiment includes a valve housing 10, a valve member 50, an upper shaft 25, a lower shaft 26, a drive portion 35, a gear portion 37 and the like.

The valve member 50 has a valve member side seal portion 51 as the “radial direction outer portion of the valve member”, an upper arm 22 and a lower arm 23. The valve member 50 is formed of a resin material having high heat resistance, for example, polyphenylene sulfide. The valve member 50 is accommodated in the valve chamber 110 and provided to be rotatable relative to the valve housing 10.

The valve member side seal portion 51 is provided radially outward of the valve member 50 when viewed from the rotation axis RA 50 of the valve member 50. The valve member side seal portion 51 is formed such that the outer wall surface 511 that can contact the housing side seal member 17 has the same shape as a part of the wall surface on the radially outer side of the cylinder. The outer wall surface 511 has seal surfaces 512 and 513 and connection seal surfaces 514 and 515, as shown in FIG. The locations and shapes where the seal surfaces 512 and 513 and the connection seal surfaces 514 and 515 are disposed are the same as the seal surfaces 212 and 213 and the connection seal surfaces 214 and 215 of the first embodiment.

In the third embodiment, the valve member side seal portion 51 is formed such that the length in the direction along the rotation axis RA50 becomes shorter as it goes in the EGR passage blocking direction.
Specifically, as shown in FIG. 13 which is a side view of the valve member 50, the valve member side seal portion 51 has a length Li31 in the direction along the rotation axis RA50 of the end portion 516 located on the EGR passage blocking direction side. Is shorter than the length Li32 in the direction along the rotation axis RA50 of the end 517 positioned on the EGR passage opening direction side. Further, in the valve member side seal portion 51, a length Li33 in a direction along the rotation axis RA50 of the intermediate portion 518 located equidistant from each of the end 516 and the end 517 corresponds to the length Li31 of the end 516 It is relatively long and short compared to the length Li32 of the end 517.

In the valve member 50, the valve member side seal portion 51 has portions where the length in the direction along the rotation axis RA50 is constant, for example, the portions of the regions A51 and A52 shown in FIG. Thereby, the valve member 50 has an edge 225 connected to the valve member side seal portion 51 of the upper arm 22 and an edge portion 235 connected to the valve member side seal portion 51 of the lower arm 23 in the side view shown in FIG. It is formed in steps.

In the valve device according to the third embodiment, the valve member side seal portion 51 is formed such that the length in the direction along the rotation axis RA50 becomes shorter as it goes in the EGR passage blocking direction. Thus, the third embodiment exhibits the effects (a) to (c) and (f) of the first embodiment.

Moreover, in the valve apparatus by 3rd embodiment, the edge 52 by the side of the upper arm 22 of the valve member side seal part 51 and the edge 53 by the side of the lower arm 23 are formed in step shape. Thereby, the degree of freedom of the throttling characteristic when throttling the intake air flowing through the intake passage 920 can be improved.

Fourth Embodiment
Next, a valve device according to a fourth embodiment will be described based on FIG. The fourth embodiment differs from the first embodiment in the shape of the valve member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

The valve device according to the fourth embodiment includes a valve housing 10, a valve member 60, an upper shaft 25, a lower shaft 26, a drive portion 35, a gear portion 37 and the like.

The valve member 60 has a valve member side seal portion 21, an upper arm 62, and a lower arm. The valve member 60 is formed of a resin material having high heat resistance, such as polyphenylene sulfide. The valve member 60 is accommodated in the valve chamber 110 and provided so as to be rotatable relative to the valve housing 10.

The upper arm 62 is provided at the end on the sensor cover 112 side of the end in the direction along the rotation axis of the valve member side seal portion 21. A water repellent film is formed on the outer wall surface of the upper arm 62. The upper arm 62 has a through hole 624 into which the upper shaft 25 is press-fitted.

In the fourth embodiment, the upper arm 62 and the lower arm are formed such that the radial length of the valve member 60 becomes shorter toward the EGR passage blocking direction. Specifically, as shown in FIG. 14, a point P65 on the rotational axis of the valve member 60 is set. In addition, a portion (curve 625 in FIG. 14) of the upper arm 62 overlapping the outer wall surface 211 of the valve member side seal portion 21 in the direction along the rotation axis RA60 is an edge as “a radially outer edge of the valve member”. It is 625.
In this case, as shown in FIG. 14, in the upper arm 62, the distance Ri421 between the point P626 located closest to the EGR passage blocking direction on the edge 625 and the point P65 is the most open direction of the EGR passage on the edge 625 The distance Ri422 between the point P627 located on the side and the point P65 is shorter than the distance Ri422. Further, as shown in FIG. 14, the distance Ri 423 between the point P 628 and the point P 65 is a point on the edge 625 and the central angle formed with the point P 626 and the central angle formed with the point P 627 is the same angle α4. Longer than the distance Ri421 and shorter than the distance Ri422. In the fourth embodiment, the following relational expression (4) holds for the distances Ri421, Ri422, and Ri423.
Ri422-Ri423 <Ri423-Ri421 ... (4)
That is, as shown in FIG. 14, the edge 625 has a shape closer to the rotational axis of the valve member in the EGR passage blocking direction than the edge 225 of the first embodiment.
In FIG. 14, a virtual line which is a set of points at the same distance from the point P65 as the distance Ri421 is indicated by a virtual line VL30. Although not shown here, the lower arm of the valve member 60 also has a similar shape.

In the valve device according to the fourth embodiment, the upper arm 62 and the lower arm are formed such that the radial length of the valve member 60 becomes shorter toward the EGR passage blocking direction. Thus, the fourth embodiment achieves the effects (a) to (c) and (f) of the first embodiment.

Further, in the valve device according to the fourth embodiment, the portion located on the EGR passage blocking direction side of the upper arm 62 is compared to the portion located on the EGR passage blocking direction side of the upper arm 22 of the valve device 1 according to the first embodiment. Located near the rotational axis of the valve member. Thereby, when molding the valve member 60, the flow of the resin is improved, so that the shape of the valve member 60 can be made into a desired shape.

(Fifth embodiment)
Next, a valve device according to a fifth embodiment will be described based on FIG. The fifth embodiment differs from the first embodiment in the shape of the valve member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

The valve device according to the fifth embodiment includes a valve housing 10, a valve member 70, an upper shaft 25, a lower shaft 26, a drive portion 35, a gear portion 37 and the like.

The valve member 70 has the valve member side seal part 21 as "a part of valve member" and a "valve member side contact part", an upper arm 72, and a lower arm. The valve member 70 is formed of a resin material having high heat resistance, such as polyphenylene sulfide. The valve member 70 is accommodated in the valve chamber 110 and provided so as to be rotatable relative to the valve housing 10.

The upper arm 72 is provided at an end of the valve member side seal portion 21 in the direction along the rotation axis RA 70 at an end on the sensor cover 112 side. A water repellent film is formed on the outer wall surface of the upper arm 72. The upper arm 72 has a through hole 724 into which the upper shaft 25 is press-fitted.

In the fifth embodiment, the upper arm 72 and the lower arm are formed such that the radial length of the valve member 70 becomes shorter toward the EGR passage blocking direction. Specifically, as shown in FIG. 15, a point P75 on the rotation axis RA70 is set. In addition, a portion (curve 725 in FIG. 15) of the upper arm 72 overlapping the outer wall surface 211 of the valve member side seal portion 21 in the direction along the rotation axis RA70 is an edge portion as “a radially outer edge of the valve member”. It is assumed that 725.
In this case, as shown in FIG. 15, in the upper arm 72, the distance Ri 521 between the point P 726 located closest to the EGR passage blocking direction on the edge 725 and the point P 75 The distance Ri522 between the point P727 located on the side and the point P75 is shorter than the distance Ri522. Further, as shown in FIG. 15, the distance Ri523 between the point P728 and the point P75 is a point on the edge 725 and the central angle forming the point 726 and the central angle formed with the point 727 are the same angle α5. Longer than distance Ri 521 and shorter than distance Ri 522.
In FIG. 15, an imaginary line which is a set of points at the same distance from the point P75 as the distance Ri 521 is indicated by an imaginary line VL70. Although not shown here, the lower arm of the valve member 70 also has a similar shape.

Further, in the valve member 70, the edge 725 of the upper arm 72 has a shape in which a plurality of straight lines are connected. That is, the valve member side seal part 21 of the valve member 70 has a plurality of flat surfaces.

In the valve device according to the fifth embodiment, the upper arm 72 and the lower arm are formed such that the radial length of the valve member 70 becomes shorter toward the EGR passage blocking direction. Thus, the fifth embodiment exhibits the effects (a) to (c) and (f) of the first embodiment.

Further, in the valve device according to the fifth embodiment, the edge portion 725 on the edge portion of the upper arm 72 and the edge portion on the valve member side seal portion of the lower arm are formed in a shape connecting a plurality of straight lines. Thereby, the degree of freedom of the throttling characteristic when throttling the intake air flowing through the intake passage 920 can be improved.

Sixth Embodiment
Next, a valve device according to a sixth embodiment will be described based on FIG. The sixth embodiment differs from the first embodiment in the positional relationship between the valve member and the housing-side seal member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

A partially enlarged view of the valve device 6 according to the sixth embodiment is shown in FIG. FIG. 16 shows a cross-sectional view of the vicinity of the valve member 20 and the housing side seal member 17 of the valve device 6 in a state where the valve member 20 and the housing side seal member 17 are in contact with each other. In FIG. 16, a solid arrow indicating the top-bottom direction in the valve device 6 is shown.

When the valve member 20 and the housing side seal member 17 are in contact with each other, the valve device 6 has the EGR pipe 951 and the intake pipe 921 such that the valve member 20 and the housing side seal member 17 have the following positional relationship. Is provided at the place where it is connected.
That is, the edge portion 201 as the “edge portion on the side opposite to the valve closing rotational direction of the valve member” in the EGR passage opening direction side of the valve member 20 corresponds to “the first seal lip portion 172 of the housing side sealing member 17 When viewed from the tip end 177 as an edge on the side opposite to the valve closing rotation direction of the opening, it is positioned in the upper direction. Specifically, it is located in the sky direction (solid arrow F6 side in FIG. 16) with respect to the virtual horizontal plane VP6 passing through the tip end 177.

If the edge on the EGR passage opening direction side of the valve member is positioned in the ground direction compared to the edge on the EGR passage opening direction side of the opening of the EGR passage of the housing side sealing member, the edge portion of the housing side sealing member and the valve member Ice is formed between the When the valve member rotates in the EGR passage opening direction, there is a possibility that the ice may impede the rotation.
In the valve device 6 according to the sixth embodiment, the edge portion 201 of the valve member 20 is located in the top direction as viewed from the tip end 177 of the housing side seal member 17. Thus, the ice formed between the tip 177 and the valve member 20 does not prevent the valve member 20 from rotating in the direction of opening the EGR passage. Therefore, the sixth embodiment has the same effect as the first embodiment, and can reliably rotate the valve member 20.

(Other embodiments)
In the above embodiment, the valve device controls the flow of the exhaust as "fluid". However, the fluid is not limited to this.

In the above-described embodiment, the valve member has a width in a direction along the rotation axis of the valve member side seal portion, and a distance from a point on the rotation axis of the valve member to a radially outer edge of the valve member It becomes short as it goes to the EGR passage blocking direction. However, either one of the width in the direction along the rotational axis of the valve member side seal portion or the distance from the point on the rotational axis of the valve member to the radial outer edge of the valve member is directed toward the EGR passage blocking direction The other is shorter than the width in the direction along the rotational axis of the valve member side seal portion or the distance from the point on the rotational axis of the valve member to the outer edge in the radial direction of the valve member It is also good. If the sum of the width in the direction along the rotational axis of the valve member side seal portion and the distance from the point on the rotational axis of the valve member to the radially outer edge of the valve member becomes shorter as it approaches the EGR passage blocking direction Good.

In the above-described embodiment, the valve housing has “flow channels” capable of communicating with the three channels. However, the number of "flow channels" is not limited to this. The number of "flow channels" may be two, as long as the valve apparatus communicates or shuts off the two flow channels by the rotation of the valve member.

The configurations of the valve members of the fourth and fifth embodiments may be applied to the valve members of the second and third embodiments.

The positional relationship between the valve member and the housing side seal member in the sixth embodiment may be applied to the second to fifth embodiments.

In the above-described embodiment, it is assumed that water repellent films are formed on the outer wall surfaces of the upper and lower arms of the valve member. However, the water repellent film may not be present. In addition, a water repellent film may be formed on the outer wall surface of the portion of the valve member excluding the upper arm and the lower arm.

In the above embodiment, the valve member is cylindrical. However, the shape of the valve member is not limited to this. It may be spherical or spherical.

As mentioned above, this indication is not limited to such an embodiment, and can be carried out with various forms in the range which does not deviate from the gist.

The present disclosure has been described in accordance with the examples. However, the present disclosure is not limited to the embodiments and structures. The present disclosure also includes various modifications and variations within the scope of equivalents. In addition, various combinations and forms, and further, other combinations and forms including only one element, more than or less than one element, and the like are also included in the scope and the scope of the present disclosure.

Claims

A valve housing (10) having a plurality of flow paths (12, 13, 14) through which fluid can flow, and a communication space (110) communicating the plurality of flow paths;
The edge portion (17 of the opening of the one flow passage provided between the flow passage (14) of the plurality of the flow passages and the communication space, provided rotatably relative to the valve housing A valve member (20, 40, 50, 60, 70) that shuts off the one flow passage and the communication space when it abuts on the
Equipped with
Assuming that the valve member rotates in a valve closing rotational direction such that the valve member is in contact with the edge of the opening after being separated from the edge of the opening.
At least a part of the valve member has a width (Li11, Li12, Li13, Li21, Li22, etc.) along the rotation axis (RA20, RA40, RA50) of the radially outer portion (21, 41, 51) of the valve member. Li23, Li31, Li32, Li33) and the distance from the point on the rotary shaft (RA20, RA60, RA70) of the valve member to the radially outer edge (225, 235, 625, 725) of the valve member (Ri221, Ri222, Ri223, Ri421, Ri422, Ri423, Ri521, Ri522, Ri523) The valve apparatus which becomes short as it goes to a valve closing rotation direction.
2. The valve device according to claim 1, wherein a width in a direction along the rotation axis of at least a part of the radially outer portion narrows toward a valve closing rotation direction.
3. The valve device according to claim 2, wherein the width in the direction along the rotation axis of at least a part of the radially outer portion decreases at a constant rate in the valve closing rotation direction.
The valve device according to claim 3, wherein the width of at least a part of the radially outer portion along the rotation axis in the direction along the valve closing rotation direction is such that the ratio of shortening becomes larger toward the valve closing rotation direction. .
The valve device according to claim 2, wherein a width in a direction along the rotation axis of at least a part of the radially outer portion is constant.
The distance from the point on the said rotating shaft of at least one part of the said valve member to the edge of the radial direction outer side of the said valve member becomes short as it goes to a valve closing rotation direction. The valve device according to.
The radially outer edge of the valve member is curved in shape;
The distance from the point on the said rotating shaft of at least one part of the said valve member to the edge of the radial direction outer side of the said valve member becomes a fixed rate according to the direction of a valve closing rotation. Valve device.
The radially outer edge of the valve member is curved in shape;
As the distance from the point on at least a part of the rotary shaft of the valve member to the radial outer edge of the valve member becomes shorter in the valve-closing rotation direction, the ratio becomes shorter in the valve-closing rotation direction 7. The valve arrangement according to claim 6, wherein it increases.
The valve device according to claim 6, wherein at least a part of the radially outer edge of the valve member is formed in a straight line.
The edge (201) on the side opposite to the valve closing rotation direction of the valve member is located in the upper direction as viewed from the edge (177) on the side opposite to the valve closing rotation direction of the opening. 9. A valve arrangement according to any of the preceding claims.
The valve device according to any one of claims 1 to 10, wherein the valve member has a water repellent film on an outer wall surface (223, 233).