KR20190122126A - Valve device - Google Patents

Abstract

The present invention relates to a valve device capable of reducing the number of processes in manufacturing. According to the present invention, the valve device (1) comprises: a valve housing (10); a valve member (21); an upper shaft (25) to be rotated with the valve member; a motor (35) rotating the valve member; and a gear part (37) connecting the motor with the upper shaft. The valve member is installed to be relatively rotated to the valve housing. When coming in contact with a housing side seal member (17), which is installed in an opening to allow a reception space (14) of the valve housing and valve chamber (110) to communicate, the valve member blocks the reception space and the valve chamber. The valve member is installed on a valve member side seal part (22), which comes in contact with the housing side seal member, and a gear part side of the valve member side seal part and includes an arm part (23) extended from the valve member side seal part in a direction facing a rotary shaft (RA20) of the valve member. The upper shaft is installed in the arm part.

Description

VALVE DEVICE

The present invention relates to a valve device.

Background Art Conventionally, a valve device is known that is provided on a flow path through which a 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 within the valve housing. For example, Patent Document 1 describes a valve device having a shaft that is rotatably integrated with a valve housing, a valve member, and a valve member, and which is inserted into a through hole of the valve housing and passed therethrough.

Patent Document 1: Japanese Patent Application Laid-Open No. 2017-8870

In the valve device described in Patent Literature 1, the valve member includes two seal portions formed so as to extend in a direction toward the rotation shaft from both ends in a direction along the rotation axis of the seal portion located radially outward from the rotation axis of the valve member. Have The shaft is provided along the axis of rotation in each of the two arm portions. That is, the valve member is rotatably supported by two shafts located on the rotation shaft.

In the valve device described in Patent Literature 1, when assembling a member in which the valve member and the shaft are integrated in the valve housing, it is necessary to apply a predetermined load to the side opposite to the portion where the shaft is press-fitted. At this time, in order to support the load, it is necessary to install the jig avoiding the other shaft other than the press-fitted shaft. For this reason, time is required for the process of assembling the member in which the valve member and the shaft are integrated in the valve housing.

This invention is made | formed in view of the said matter, and the objective is to provide the valve apparatus which can reduce the number of processes at the time of manufacture.

The valve device of the present invention includes a valve housing 10, a valve member 21, a rotary shaft 25, a driving force generator 35, and a connection 37.

The valve housing has a plurality of flow paths 12, 13, 14 capable of circulating fluid, and a communication space 110 communicating with the plurality of flow paths.

The valve member is installed in the communication space so as to be relatively rotatable with respect to the valve housing, and when the valve member contacts the edge portion of the opening communicating with one of the plurality of flow paths, it is possible to block one flow path and the communication space.

The rotary shaft is installed on the rotation shaft RA20 of the valve member, and is rotatable integrally with the valve member.

The driving force generating portion generates a driving force capable of rotating the valve member.

The connecting portion connects the driving force generating portion and the rotation shaft.

In the valve device of the present invention, the valve member is provided on the valve member side seal portion 22 and the valve member side seal portion connecting portion side which may abut on the edge portion, and in one direction from the end portion of the valve member side seal portion connecting portion side. It has an arm part 23 formed so that it may extend. Moreover, the valve member is rotatably supported with respect to the valve housing by only the rotating shaft provided in the arm part.

In the valve device of the present invention, the valve member is rotatably supported by only the rotation shaft provided in the arm portion on the connecting portion side. That is, in the valve device of the present invention, the valve member is not provided with a rotating shaft on the opposite side to the connecting portion of the valve member side seal. As a result, when assembling the member in which the valve member and the shaft are integral to the valve housing, the jig for supporting the load for press-fitting along the rotating shaft can be relatively easily inserted. Therefore, the valve device of the present invention can shorten the time required for the step of assembling the member in which the valve member and the shaft are integral to the valve housing, so that the number of steps in manufacturing can be reduced.

In the valve device of the present invention, the valve member side seal portion and the arm portion are integrally formed of resin. The rotary shaft has a shaft portion 26 located on the rotating shaft and engaging portions 25, 45, 55, 67 which are located inside the arm portion and protrude in the radially outward direction of the shaft portion. The engagement portion changes as the length in the radial direction seen from the point on the rotation axis is directed in the circumferential direction, or has the unevenness 671, 672 in the direction along the rotation axis.

The rotary shaft provided in the arm part in the valve device of the present invention is located inside the arm part and has a fitting part formed to protrude in the radially outward direction of the shaft part. As the engagement portion changes as the length of the radial direction seen from the point on the rotation axis is circumferentially or has irregularities in the direction along the rotation axis, the relative rotation of the valve member relative to the rotation shaft is caused by engagement with the arm portion. Suppressed. Accordingly, even if the valve member is supported so as to be rotatable in a cantilever manner, it is possible to prevent the valve shaft and the rotation shaft from being pulled out in the circumferential direction of the rotary shaft while preventing the valve shaft from being pulled out in the direction along the rotary shaft.

1 is a schematic diagram of an engine system to which the valve device according to the first embodiment is applied.
2 is an external view of a valve device according to the first embodiment.
FIG. 3 is a view seen in the direction of arrow III in FIG. 2.
4 is a cross-sectional view taken along the line IV-IV of FIG. 3.
It is a schematic diagram explaining the operation | movement of the valve apparatus which concerns on 1st Embodiment.
6 is a perspective view of a rotating member included in the valve device according to the first embodiment.
FIG. 7 is a view in the direction of arrow Ⅶ of FIG. 6; FIG.
FIG. 8 is a cross-sectional view taken along line VII-VII of FIG. 7.
FIG. 9 is a view as viewed in the direction of the arrow of FIG. 2. FIG.
FIG. 10 is a view as viewed in the direction of the arrow of FIG. 8. FIG.
It is a schematic diagram explaining the manufacturing process of the valve apparatus which concerns on 1st Embodiment.
It is a top view of the rotating member with which the valve apparatus which concerns on 2nd Embodiment is equipped.
It is a top view of the rotating member with which the valve apparatus which concerns on 3rd Embodiment is equipped.
It is a top view of the rotating member with which the valve apparatus which concerns on 4th Embodiment is equipped.
It is a perspective view of the rotating member with which the valve apparatus which concerns on 5th Embodiment is equipped.
It is a perspective view of the rotating member with which the valve apparatus which concerns on 6th Embodiment is equipped.
It is a schematic diagram explaining the manufacturing process of the valve apparatus of a comparative example.

EMBODIMENT OF THE INVENTION Hereinafter, some embodiment is described based on drawing. In addition, in some embodiment, the same code | symbol is attached | subjected to substantially the same site | part and description is abbreviate | omitted.

(1st embodiment)

The valve apparatus 1 which concerns on 1st Embodiment is demonstrated based on FIGS. The valve device 1 is applied to an engine system 90 that generates a driving force by burning fuel. Initially, the engine system 90 is demonstrated using FIG. The engine system 90 includes an engine 91, an intake machine 92, an exhaust system 93, a supercharger 94, an exhaust reflux system 95, and the like. In addition, the engine 91 is a well-known structure in which the piston 912 is accommodated in the cylinder 911 to form the combustion chamber 910.

The intake machine 92 supplies air to the engine 91 from the outside air. The intake machine 92 has 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 called "suction air."

The intake pipe 921 is a pipe for guiding intake air into 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 thereof 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 which branches into the same number of passages as the number of cylinders 911. The air cleaner 923 removes foreign matter from the air taken in from the atmosphere. The intercooler 924 cools the suction air compressed by the compressor 941 of the supercharger 94 and heated up. The throttle 925 adjusts the intake air 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 exhaust exhausted by the engine 91 to the outside air. The exhaust system 93 has 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. The 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 to the number of cylinders 911 join. The exhaust purification unit 933 is provided in the exhaust pipe 931. The exhaust purification unit 933 decomposes hydrocarbons contained in exhaust gas or traps particulate matter.

The supercharger 94 uses the exhaust energy to supercharge the intake air pressurized in the combustion chamber 910 by compressing the intake air in the intake pipe 921. The supercharger 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 may 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 rotate in synchronization with the shaft 943.

The exhaust reflux system 95 returns the exhaust after passing through the turbine 942 to the intake passage 920. The exhaust returned to the intake passage 920 is supplied to the combustion chamber 910 together with the air via the air cleaner 923. The exhaust reflux meter 95 includes an EGR pipe 951, an EGR cooler 952, and a valve device 1.

The EGR pipe 951 connects the downstream side of the exhaust 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 returning the exhaust gas after passing through the turbine 942 to the air before compression by the compressor 941. The EGR cooler 952 is installed 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 the portion 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 composed of a microcomputer and the like having a CPU as an arithmetic unit and a RAM and a ROM as a storage unit. The ECU 96 controls the driving of the throttle 925 or the valve device 1 in accordance with the driving situation of the vehicle or apparatus in which the engine system 90 is mounted, and the operation contents of the operator who operates the vehicle or apparatus.

Next, the detailed structure of the valve apparatus 1 is demonstrated based on FIGS. The valve device 1 is a rotary valve which can increase or decrease the opening degree of a fluid passage by rotating a valve member. The valve device 1 can increase or decrease the opening degree of the intake passage 920 of the EGR passage 950. The valve device 1 has a valve housing 10, a rotating member 20, two bearings 28, 29, a drive unit 35 as a “drive force generating unit” and a gear unit 37 as a “connecting unit”. .

The valve housing 10 has a casing 111, a sensor cover 112, a bottom cover 113, a cylinder member 16, a housing side seal member 17 as an “edge portion of an opening”, and the like.

The casing 111 is formed to accommodate the rotating member 20 by a metal material such as aluminum. The casing 111 forms a confluence of the intake passage 920 and the EGR passage 950. Specifically, as shown in FIG. 5, the casing 111 includes a valve chamber 110 as a “communication space”, an upstream flow path 12 as a “flow path”, a downstream flow path 13 as a “flow path” and “ And a receiving space 14 as “one flow path”.

The valve chamber 110 is formed to accommodate the rotation member 20 rotatably.

The upstream flow passage 12 is formed to communicate with the valve chamber 110. The upstream 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 flow passage 13 is formed coaxially with the upstream flow passage 12. The downstream flow passage 13 communicates with the intercooler 924.

The accommodation space 14 is formed so as 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 to accommodate the cylindrical member 16 in which the housing side seal member 17 is assembled. The accommodation space 14 communicates with the EGR passage 950.

The casing 111 has the wall 114 which forms the valve chamber 110, as shown in FIG. The wall 114 has a through hole 101 through which the upper shaft 25 is fitted. Bearings 28 and 29 are provided on the inner wall that forms the through hole 101 of the wall 114.

The sensor cover 112 is installed on the opposite side to the valve chamber 110 as seen from the wall 114 of the casing 111. The sensor cover 112 together with the casing 111 forms an accommodation space 370 that can accommodate the driving unit 35, the gear unit 37, and the like.

The bottom cover 113 is installed on the side opposite to the side on which the sensor cover 112 of the casing 111 is installed. The bottom cover 113 has a substantially flat plate shape and forms a valve chamber 110 together with the casing 111.

The cylinder member 16 is a member provided separately from the casing 111. The cylinder member 16 has a flange part 161, the 1st side wall part 162, and the 2nd side wall part 163. As shown in FIG. The cylinder member 16 is formed from stainless steel.

The flange part 161 is a site | part formed in substantially annular shape. When the cylinder member 16 is accommodated in the accommodation space 14, the flange part 161 abuts against the step surface 141 provided in the inner wall which forms the accommodation space 14, as shown in FIG. All. At this time, the cylinder member 16 is fixed to the casing 111 by pressing the annular ring 191 into the casing 111. The ring 191 presses the flange portion 161 to the stepped surface 141 through the wave washer 192.

The first side wall portion 162 and the second side wall portion 163 are formed to extend along the central axis direction of the flange portion 161 from a cross section that abuts against the stepped 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 sidewall portion 162 and the second sidewall portion 163 are formed so that their center angles are 180 degrees. The first side wall portion 162 is formed such that the height extending along the central axis direction of the flange portion 161 is lower than the height extending along the central axis direction of the flange portion 161 of the second side wall portion 163. It is.

The housing side seal member 17 has a first covering portion 171, a first seal lip portion 172, a second covering portion 173, and a second sealing lip portion 174. The housing side sealing member 17 is formed in substantially cylindrical shape with elastic materials, such as rubber | gum.

The 1st covering part 171 is formed so that the edge part of the 1st side wall part 162 in the radial direction inner side, the radial direction outer side, and the flange part 161 side may be covered.

The 1st seal lip | rip part 172 is a lip shaped site | part provided in the site | part which covers the edge part on the opposite side to the flange part 161 side of the 1st coating part 171. As shown in FIG. When the first seal portion 172 is installed to cover the first sidewall portion 162, the first seal lip portion 172 may have a radially outward direction of the first sidewall portion 162, as shown in FIG. 5. That is, the flange portion 161 is formed to protrude in the radially outward direction.

The second covering part 173 has a radially inner side, a radially outer side, an end opposite to the flange portion 161 side of the second side wall portion 163, and a first side wall portion 162 of the second side wall portion 163. Is formed so as to cover the end face of the portion to be connected with

The 2nd seal lip | rip part 174 is a lip shaped part provided in the site | part which covers the edge part on the opposite side to the flange part 161 side of the 2nd covering part 173. As shown in FIG. When the second seal portion 174 is installed to cover the second sidewall portion 163, the second seal portion 174 may have a diameter inward direction of the second sidewall portion 163, as shown in FIG. 5. That is, the flange portion 161 is formed to protrude in the radially inner direction.

The rotating member 20 is rotatably housed in the valve housing 10. When the rotating member 20 abuts on the housing side sealing member 17, the rotating member 20 can block the accommodation space 14 and the valve chamber 110. Detailed configuration of the rotating member 20 will be described later.

The bearings 28 and 29 are provided on the wall 114 of the casing 111 to rotatably support the rotating member 20.

The drive part 35 is a DC-type motor which has the sliding structure of a brush and a commutator, for example. The drive part 35 is electrically connected with ECU 96 via the connector 116 which the valve housing 10 has. The driving unit 35 generates a driving force capable of rotating the rotating member 20 under the control of the ECU 96.

The gear part 37 has a plurality of cog wheels, amplifies the torque of the driving part 35 according to the reduction ratio, and transmits the torque to the upper shaft 25. The gear portion 37 is supported by a central axis in common with the pinion gear 371 and the intermediate reduction gear 372 and the intermediate reduction gear 372 engaged with the pinion gear 371 attached to the output shaft of the driving portion 35. A small diameter gear 373 and a valve gear 374 rotate 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 a relatively large outer diameter and rotates integrally with the upper shaft 25. A return spring 39 is provided between the valve gear 374 and the casing 111 to press the rotating member 20 to rotate the rotating member 20 in the EGR passage blocking direction.

The detector 38 has a magnet 381 and a hall IC 382. The magnet 381 is fixed to the valve gear 374 and rotates together with the upper shaft 25 and the valve gear 374. The hall IC 382 is provided in the sensor cover 112. The hall IC 382 outputs an electric signal corresponding to the magnetic flux density of the magnetic field generated by the magnet 381 to the ECU 96 via the connector 116. The ECU 96 feedback-controls the energization amount of the driving unit 35 so that the rotation angle of the rotating member 20 detected by the detection unit 38 matches the target value. In addition, the target value of the rotation angle is set according to the operating state of the engine system 90.

Next, the detailed structure of the rotating member 20 is demonstrated with reference to FIGS. The rotating member 20 has a valve member 21 and an upper shaft 25 as a "rotating shaft". The valve member 21 and the upper shaft 25 are integrally rotatable.

The valve member 21 has a valve member side seal portion 22 and an arm portion 23. The valve member side seal portion 22 and the arm portion 23 are integrally formed of a resin material having high heat resistance, for example, polyphenylene sulfide. As shown in FIG. 5, the valve member 21 is accommodated in the valve chamber 110, and is provided so that relative rotation with respect to the valve housing 10 is possible (refer to the solid arrows R5 and R6 of FIG. 5). . Here, with respect to the rotation direction of the valve member 21, the direction shown by the solid arrow "R5" for convenience is called "EGR passage blocking direction", and the direction shown by the solid arrow "R6" shows the "EGR passage opening direction". This is called. In addition, Figure 5 shows the rotating member 20 in various positions in a solid line or a dotted line. Specifically, the rotating member 20 in the state of blocking the EGR passage 950 is used as the rotating member 20a, and the intake passage 920 is entirely opened while the EGR passage 950 is partially opened. The rotating member 20 is used as the rotating member 20b, and the rotating member 20 in the state which cuts off the intake passage 920 is shown as the rotating member 20c.

The valve member side seal portion 22 has an outer wall surface 221 which can abut on the housing side seal member 17 on the radially outer side when viewed from the rotation shaft RA20. The outer wall surface 221 is formed to be shaped like a part of the wall surface of the cylinder in the radially outer side. As shown in FIG. 6, the outer wall surface 221 has seal surfaces 222 and 223 and a connecting seal surface 224 as a “seal surface”.

The seal surfaces 222 and 223 are formed to face the circumferential direction of the valve member side seal portion 22 on the outer wall surface 221.

The seal surface 222 is formed to face the EGR passage blocking direction on the outer wall surface 221. The seal surface 222 is shaped like a part of the inner wall surface of the side wall on the radially outer side of the cylinder. In the present embodiment, the seal face 222 has a semi-cylindrical shape having a central angle of 180 degrees. The seal surface 222 is formed such that the radius is larger than the radius of the seal surface 223.

The seal surface 223 is formed to face the EGR passage blocking direction on the outer wall surface 221. The seal surface 223 is shaped like a part of the outer wall surface of the side wall on the radially outer side of the cylinder. In the present embodiment, the seal surface 223 has a semi-cylindrical shape with a central angle of 180 degrees.

The virtual cylindrical surface including the seal surface 222 and the virtual cylindrical surface including the seal surface 223 have a central axis on the same axis. The central axis of the virtual cylindrical surface is orthogonal to the rotation axis RA20 of the valve member 21.

The connection seal surface 224 is formed to face the EGR passage blocking direction on the outer wall surface 221. The connection seal surface 224 is formed to be orthogonal to the seal surfaces 222 and 223. The normal line of the connecting surface 224 is orthogonal to the rotation axis RA20 when it is moved in parallel.

In this embodiment, the sealing surfaces 222 and 223 and the connecting sealing surface 224 are arranged in a substantially annular shape. A gate for injecting a resin for forming the valve member 21 when the valve member 21 is formed at approximately the center of the outer wall surface 221 surrounded by the seal surfaces 222 and 223 and the connecting seal surface 224. Is installed. As a result, a gate mark 225 is formed at substantially the center of the outer wall surface 221 surrounded by the seal surfaces 222 and 223 and the connection seal surface 224.

When the valve member 21 rotates in the opening direction of the EGR passage, the EGR passage communicating with the accommodation space 14 with respect to the valve chamber 110 while narrowing the upstream flow passage 12 with respect to the valve chamber 110 to the minimum ( 950 is opened to the maximum (see the state of the rotating member 20c of FIG. 5).

When the valve member 21 rotates in the EGR passage blocking direction, the first seal lip 172 abuts on the seal surface 222, and the second seal lip 174 abuts on the seal surface 223. Accordingly, the upstream flow passage 12 is opened to the valve chamber 110 to the maximum while the valve chamber 110 and the EGR passage 950 are blocked (see the state of the rotating member 20a in FIG. 5).

In addition, in this embodiment, it is possible to increase or decrease the opening degree of the intake passage 920 with the opening degree to the intake passage 920 of the EGR passage 950 by controlling the rotation angle of the valve member 21. Accordingly, since the magnitude of the negative pressure of the intake passage 920 can be controlled, for example, the rotation angle of the valve member 21 is controlled instead of using the negative pressure generated by the engine 91. By this means, it is possible to control the amount of exhaust gas flowing into the intake passage 920 (for example, refer to the state of the rotating member 20b of FIG. 5).

A plurality of ribs 227 are formed on the inner wall surface 226 as the "surface opposite to the surface which can abut the edge part" of the valve member side seal portion 22. As shown in FIG. 10, the plurality of ribs 227 are circular and centered (C22) of the plurality of concentric circles from the center C22 of the area surrounded by the seal surfaces 222 and 223 and the connecting seal surface 224. ) Is formed radially.

As shown in FIG. 4, the arm part 23 is provided in the edge part of the gear part 37 side among the edge parts of the valve member side seal part 22 along the rotating shaft RA20. The arm part 23 is a substantially fan-shaped part which is formed so that it may extend in the direction toward the rotation shaft RA20 as "one direction" from the edge part of the gear part 37 side of the valve member side seal part 22 ( 6, 7). As shown in FIG. 8, a part of the upper shaft 25 is inserted in the edge part on the opposite side to the side connected to the valve member side sealing part 22 of the arm part 23. As shown in FIG.

8 is a cross-sectional view of an imaginary surface including the rotation shaft RA20 of the valve member 21. In FIG. 8, the boundary of the valve member side seal part 22 and the arm part 23 is shown by the dashed-dotted line VL20 for convenience. As shown in FIG. 8, the inner wall surface 231 as the “surface opposite to the connecting portion” of the arm portion 23 is formed to be smoothly connected to the inner wall surface 226 of the valve member side seal portion 22. . In this embodiment, in the cross section shown in FIG. 8, the inner wall surface 231 of the arm portion 23 is formed in a curved shape. Accordingly, when the rotating member 20 blocks the EGR passage 950, specifically, when the rotating member 20 is shown in FIG. 5 as the rotating member 20b or the rotating member 20c. As shown in FIG. 9, the rotating member 20 is not positioned between the upstream flow passage 12 and the downstream flow passage 13. The inner wall surface 231 of the arm portion 23 is formed with a rib (not shown) that connects to the rib 227 of the valve member side seal portion 22.

The upper shaft 25 is a member made of stainless steel, for example. The upper shaft 25 has a shaft portion 26 and a fastening portion 27. In this embodiment, the shaft portion 26 and the engaging portion 27 are formed separately.

As shown in FIG. 4, the shaft portion 26 is formed to extend from the end portion on the rotation shaft RA20 of the arm portion 23 toward the sensor cover 112. The shaft portion 26 is located on the rotating shaft RA20 of the rotating member 20. The shaft portion 26 is inserted into the through hole 101 of the casing 111 and is rotatably supported by the bearings 28 and 29.

The shaft portion 26 has a concave portion 262 on the outer wall surface 261 of the radially outer side of the portion inserted into the arm portion 23. That is, the outer wall surface 261 of the site | part inserted in the arm part 23 of the shaft part 26 is formed so that it may have unevenness.

The shaft portion 26 is provided so that the end surface 263 on the side opposite to the gear portion 37 is exposed from the arm portion 23. As shown in FIG. 8, the end surface 263 is formed to be flush with the inner wall surface 231 of the arm portion 23. In the end face 263, a hole 264 having a bottom as a “concave-shaped space” is formed.

The engagement part 27 is provided in the site | part inserted into the arm part 23 of the shaft part 26. As shown in FIG. The engaging portion 27 is a substantially triangular flat member that is located inside the arm portion 23 and is formed to protrude in the radially outward direction of the shaft portion 26. The engaging portion 27 is formed so that the length in the radial direction from the point on the rotation shaft RA20 changes in the circumferential direction. Specifically, as shown in FIG. 7, a plurality of protrusions 271 are provided at the tip of an end portion formed to extend in the direction of the valve member side seal portion 22 from the rotation shaft RA20. A recess 272 is formed between the neighboring protrusions 271. In the present embodiment, two concave portions 272 are formed with respect to the three protruding portions 271. The three protrusions 271 and the two concave portions 272 are provided in regions other than the weld line 228 formed when the valve member 21 is molded by resin.

Next, the manufacturing method of the valve apparatus 1 is demonstrated, comparing with a comparative example. FIG. 11 shows the state of the press-fitting process of the upper shaft 25 to the bearings 28 and 29 in the manufacturing process of the valve device 1. 17 shows the state of the press fitting process of the upper shaft 25 to the bearings 28 and 29 in the manufacturing process of the valve apparatus 9 of a comparative example.

Here, the structure of the valve apparatus 9 of a comparative example is demonstrated. The valve device 9 of the comparative example includes a valve housing 10, a rotating member 30, two bearings 28 and 29, a drive unit 35, and a gear unit 37.

The rotating member 30 is rotatably housed in the valve housing 10 and has a valve member 31, an upper shaft 25, and a lower shaft 33. The valve member 31 has a lower arm portion 312 connected to the lower shaft 33 in addition to the upper arm portion 311 connected to the upper shaft 25. That is, unlike the rotary member 30 of the present embodiment, the rotary member 30 is provided with a lower shaft 33 which integrally rotates with the valve member 31 on the bottom cover 113 side of the valve member 31. It is. Accordingly, the rotating member 30 is supported by the valve housing 10 so as to be rotatable by the upper shaft 25 and the lower shaft 33.

In the manufacturing process of the valve apparatus 9 of a comparative example, when the upper shaft 25 is press-fitted into the bearings 28 and 29, as shown in FIG. 17, the lower shaft 33 side of the upper shaft 25 is shown. A supporting jig 34 is inserted into the valve housing 10 to support the end face 263. At this time, as shown in FIG. 17, it is necessary to insert the supporting jig 34 into the valve housing 10 so as to bypass the lower shaft 33.

On the other hand, in the manufacturing process of the valve apparatus 1 of this embodiment, when pressing the upper shaft 25 into the bearings 28 and 29, as shown in FIG. 11, the support jig | tool along rotation shaft RA20. The end face 263 of the upper shaft 25 can be supported by inserting the 24 into the valve housing 10. At this time, in this embodiment, the protrusion part 241 formed in the front-end | tip of the support jig 24 can be inserted into the hole 264 provided with the bottom of the bearing 26, and can be stabilized.

In the valve device 1 according to the first embodiment, the valve member 21 is provided with an upper shaft provided on the arm portion 23 provided on the gear portion 37 side with respect to the valve member side seal portion 22 ( Only by 25) is rotatably supported. In other words, the rotation member 30 is not provided with the rotation shaft on the side opposite to the gear portion 37 of the valve member side seal portion 22. Accordingly, when assembling the rotating member 20 to the valve housing 10, the support jig 24 for supporting the load along the rotating shaft RA20 can be inserted into the valve housing 10, which is relatively easy. The upper shaft 25 can be pressed into the bearings (28, 29). Therefore, since the valve apparatus 1 can shorten the time required for the process of assembling the rotating member 20 to the valve housing 10, the number of processes at the time of manufacture can be reduced.

Moreover, in the valve apparatus 1, since the shape of the valve member 21 becomes simple compared with the shape of the valve member 31 of a comparative example, the manufacturability of the valve member 21 can be improved.

In the valve apparatus 1 which concerns on 1st Embodiment, two bearings 28 and 29 which rotatably support the rotating member 20 are provided. Accordingly, since the valve device 1 can reliably support the upper shaft 25 of the rotating member 20 rotated by the cantilever, the rotating member 20 can rotate smoothly.

In the valve device 1 according to the first embodiment, the valve member side seal portion 22 and the arm portion 23 are integrally formed of a resin material. Thereby, the valve apparatus 1 can improve the manufacturability of the valve member 21, and can also ensure the strength of the valve member side sealing part 22 and the arm part 23. As shown in FIG.

In the valve device 1 according to the first embodiment, the upper shaft 25 is an engaging portion 27 formed so as to protrude in the radially outward direction of the shaft portion 26 and the shaft portion 26 located on the rotary shaft RA20. ) The engaging portion 27 inserted into the arm portion 23 changes as the length in the radial direction from the point on the rotation shaft RA20 is directed in the circumferential direction. Accordingly, the valve device 1 prevents the valve member 21 and the upper shaft 25 from being pulled out in the circumferential direction of the rotary shaft RA20 while preventing the upper shaft 25 in the direction along the rotary shaft RA20 from being pulled out. You can prevent it.

In the valve device 1 according to the first embodiment, the shaft portion 26 and the engaging portion 27 are formed separately. Thereby, the valve apparatus 1 can improve the degree of freedom of each shape of the shaft part 26 and the engagement part 27. As shown in FIG. Therefore, it is possible to further prevent the upper shaft 25 in the direction along the rotating shaft RA20 from being pulled out by increasing the outer diameter of the engaging portion 27. In addition, the engagement part 27 formed in flat form can be easily formed by press. As a result, the valve device 1 can reduce the manufacturing cost of the valve device 1.

In the valve device 1 according to the first embodiment, the three projecting portions 271 and the two recesses 272 of the engaging portion 27 are provided in the region excluding the weld line 228. Accordingly, it is possible to prevent the stress at the time of rotation of the rotating member 20 from the weld line 228 having a relatively low strength. Therefore, breakage of the rotating member 20 can be prevented.

In the valve device 1 according to the first embodiment, the shaft portion 26 is formed to have irregularities by the concave portion 262 of the outer wall surface 261 on the radially outer side. Accordingly, it is possible to prevent the shaft portion 26 from being pulled out of the upper shaft 25 in the direction along the rotation shaft RA20.

In the valve device 1 according to the first embodiment, the shaft portion 26 is provided so that the end surface 263 on the side opposite to the gear portion 37 is exposed from the arm portion 23. Thereby, the load acting on the upper shaft 25 in the press fitting process of the upper shaft 25 to the bearings 28 and 29 can be received by the metal shaft part 26.

In addition, in the valve apparatus 1, when the end surface 263 of the shaft part 26 contacts the support jig 24, the protrusion part 241 of the support jig 24 is provided with the bottom of the shaft part 26. As shown in FIG. It is inserted into one hole 264. Thereby, in the press-fitting process of the upper shaft 25 to the bearing 28 and 29, the position shift of the support jig 24 with respect to the axial part 26 can be prevented.

In the valve device 1 according to the first embodiment, the end face 263 of the shaft portion 26 and the inner wall surface 231 of the arm portion 23 are formed to be the same surface. As a result, when the valve device 21 is molded by a mold, a slide mold for exposing the end portion having the end face 263 of the shaft portion 26 is unnecessary, thereby simplifying the division of the mold. It can be done.

In the valve device 1 according to the first embodiment, the inner wall surface 231 of the arm portion 23 is formed in a curved shape, and the inner wall surface 231 of the arm portion 23 and the valve member side seal portion 22 are formed. The inner wall surface 226 of) is connected smoothly. As a result, when the EGR passage 950 is blocked by the rotating member 20, the upstream side flow path is not located between the upstream flow path 12 and the downstream flow path 13. The pressure loss by the rotating member 20 in the flow of the fluid between the 12 and the downstream side flow path 13 can be made small. In addition, the rigidity of the valve member 21 can be improved.

In the valve device 1 according to the first embodiment, the inner wall surface 231 of the arm portion 23 and the inner wall surface 226 of the valve member side seal portion 22 have ribs 227. Accordingly, the valve member 21 can be made light while maintaining the rigidity to some extent. In addition, the vibration resistance can be improved by lightening the valve member 21.

The rib 227 of the valve member 21 is formed in a circular shape and a radial shape. Accordingly, when the valve member 21 is molded by resin, it is possible to prevent the time difference from reaching the resin flowing to form the seal surfaces 222 and 223 and the connection seal surface 224. Therefore, the valve device 1 can mold the seal surfaces 222 and 223 and the connection seal surface 224 with high accuracy.

In addition, the gate injecting the resin forming the valve member 21 in the valve member 21 corresponds to approximately the center of the outer wall surface 221 surrounded by the seal surfaces 222 and 223 and the connecting seal surface 224. It is installed at the position. Accordingly, since the valve device 1 can prevent the time difference from reaching the resin flowing to form the seal surfaces 222 and 223 and the connection seal surface 224, the seal surfaces 222 and 223 And the connecting seal surface 224 can be molded more precisely.

(2nd embodiment)

Next, the valve apparatus which concerns on 2nd Embodiment is demonstrated based on FIG. The second embodiment differs from the first embodiment in the shape of the engaging portion.

The valve device according to the second embodiment includes a valve housing 10, a rotating member 40, two bearings 28 and 29, a drive unit 35, and a gear unit 37. The rotating member 40 is rotatably housed in the valve housing 10. When the rotating member 40 abuts on the housing side sealing member 17, the rotating member 40 can block the accommodation space 14 and the valve chamber 110. The rotating member 40 has a valve member 21 and an upper shaft 45 as a "rotating shaft".

The upper shaft 45 is a member made of stainless steel. The upper shaft 45 has a shaft portion 26 and a fastening portion 47. In this embodiment, the shaft portion 26 and the engaging portion 47 are formed separately.

The engaging portion 47 is provided at a portion inserted into the arm portion 23 of the shaft portion 26. The engaging portion 47 is a substantially triangular flat member that is located inside the arm portion 23 and is formed to protrude in the radially outward direction of the shaft portion 26. The engagement portion 47 is formed so that the length in the radial direction from the point on the rotation shaft RA40 of the rotation member 40 changes in the circumferential direction. Specifically, as shown in FIG. 12, the valve member side seal portion 22 is formed from the front end of the end formed so as to extend in the direction of the valve member side seal portion 22 from the rotation shaft RA40 and the rotation shaft RA40. It has a plurality of protrusions 471 at the tip of the end portion formed to extend in the opposite direction. A recess 472 is formed between neighboring protrusions 471. The three protrusions 471 and the two recesses 472 are provided in regions other than the weld line 228 formed when the valve member 21 is molded by resin.

In the valve device according to the second embodiment, the valve member 21 is rotatably supported by only the upper shaft 45. Further, the engaging portion 47 is formed so that the length in the radial direction from the point on the rotation shaft RA40 changes in the circumferential direction. Accordingly, the second embodiment achieves the same effects as the first embodiment.

(Third embodiment)

Next, the valve apparatus which concerns on 3rd Embodiment is demonstrated based on FIG. The third embodiment differs from the first embodiment in the shape of the engaging portion.

The valve device according to the third embodiment includes a valve housing 10, a rotating member 50, two bearings 28 and 29, a drive unit 35, and a gear unit 37. The rotating member 50 is accommodated rotatably in the valve housing 10. When the rotating member 50 contacts the housing side sealing member 17, the rotating member 50 may block the accommodation space 14 and the valve chamber 110. The rotating member 50 has a valve member 21 and an upper shaft 55 as a "rotating shaft".

The upper shaft 55 is a member formed of stainless steel. The upper shaft 55 has a shaft portion 26 and an engagement portion 57. In this embodiment, the shaft portion 26 and the engaging portion 57 are formed separately.

The engagement part 57 is provided in the site | part inserted into the arm part 23 of the shaft part 26. As shown in FIG. The engaging portion 57 is a flat member which is located inside the arm portion 23 and is formed in a hexagonal shape.

In the valve device according to the third embodiment, the valve member 21 is rotatably supported by only the upper shaft 55. In addition, the engaging part 57 is formed so that the shape on the imaginary surface perpendicular | vertical to the rotating shaft RA50 of the rotating member 50 may become hexagonal shape. Accordingly, even if a force acts in the circumferential direction due to the rotation of the rotating member 50, the arm portion 23 is engaged with the side surface 571 of the engaging portion 57, so that the valve member 21 and the upper shaft ( Prevent relative rotation of 55). Therefore, 3rd Embodiment has the same effect as 1st Embodiment.

(4th Embodiment)

Next, the valve device according to the fourth embodiment will be described based on FIG. 14. The fourth embodiment differs in the shape of the engaging portion from the first embodiment.

The valve device according to the fourth embodiment includes a valve housing 10, a rotating member 60, two bearings 28 and 29, a drive unit 35, and a gear unit 37. The rotating member 60 is rotatably housed in the valve housing 10. When the rotating member 60 is in contact with the housing-side seal member 17, the rotation member 60 may block the accommodation space 14 and the valve chamber 110. The rotating member 60 has a valve member 21 and an upper shaft 65 as a "rotating shaft".

The upper shaft 65 is a member made of stainless steel. The upper shaft 65 has a shaft portion 26 and a fastening portion 67. In this embodiment, the shaft portion 26 and the engaging portion 67 are formed separately.

The engaging portion 67 is provided at a portion inserted into the arm portion 23 of the shaft portion 26. The engaging portion 67 is a flat member that is located inside the arm portion 23 and is formed in a substantially circular shape having a center on the rotation shaft RA60 of the rotating member 60. The engagement portion 67 has a projection 671 as "convex" projecting in the direction along the axis of rotation RA60 and a recess 672 as "concave" which is concave in the direction along the axis of rotation RA60.

In the valve device according to the fourth embodiment, the valve member 21 is rotatably supported only by the upper shaft 65. In addition, the engaging portion 67 has a protrusion 671 and a recess 672 formed along the rotation axis RA60. Accordingly, even if a force acts in the circumferential direction due to the rotation of the rotary member 60, the arm member 23 is engaged with the protrusion 671 and the recessed portion 672 so that the valve member 21 and the upper shaft 65 To prevent relative rotation. Therefore, 4th Embodiment has the same effect as 1st Embodiment.

(5th Embodiment)

Next, the valve device according to the fifth embodiment will be described based on FIG. 15. In the fifth embodiment, the shape of the rib of the valve member is different from that in the first embodiment.

The valve device according to the fifth embodiment includes a valve housing 10, a rotating member 70, two bearings 28 and 29, a drive unit 35, and a gear unit 37. When the rotating member 70 is in contact with the housing side seal member 17, the rotation member 70 may block the accommodation space 14 and the valve chamber 110. The rotating member 70 has a valve member 71 and an upper shaft 25.

The valve member 71 has a valve member side seal portion 72 and an arm portion 73. Ribs 74 are formed on the inner wall surface 726 of the valve member side seal portion 72 and the inner wall surface 731 of the arm portion 73. The rib 74 is formed in the shape of an oblique lattice, as shown in FIG. In addition, the structure of the valve member 71 is the same structure as the valve member 21 except a rib.

In the valve device according to the fifth embodiment, the valve member 71 is rotatably supported only by the upper shaft 25. As a result, the fifth embodiment achieves the same effects as the first embodiment.

In the valve device according to the fifth embodiment, the valve member 71 has ribs 74 formed in the inclined lattice shape on the inner wall surfaces 726 and 731. Accordingly, the strength can be improved while the valve member 71 is made light.

(6th Embodiment)

Next, the valve apparatus which concerns on 6th Embodiment is demonstrated based on FIG. In the sixth embodiment, the shape of the rib of the valve member is different from that in the first embodiment.

The valve device according to the sixth embodiment includes a valve housing 10, a rotating member 80, two bearings 28 and 29, a drive unit 35, and a gear unit 37. When the rotating member 80 is in contact with the housing-side seal member 17, the rotation member 80 may block the accommodation space 14 and the valve chamber 110. The rotating member 80 has a valve member 81 and an upper shaft 25.

The valve member 81 has a valve member side seal portion 82 and an arm portion 83. Ribs 84 are formed on the inner wall surface 826 of the valve member side seal portion 82 and the inner wall surface 831 of the arm portion 83. The rib 84 is formed in a vertical lattice shape, as shown in FIG. In addition, the structure of the valve member 81 is the same structure as the valve member 21 except a rib.

In the valve device according to the sixth embodiment, the valve member 81 is rotatably supported by only the upper shaft 25. Thus, the sixth embodiment achieves the same effect as the first embodiment.

In the valve device according to the sixth embodiment, the valve member 81 has ribs 84 formed on the inner wall surfaces 826 and 831 in a vertical lattice shape. Accordingly, the strength can be improved while the valve member 81 is made light.

(Other embodiment)

In the above embodiment, the valve device is assumed to control the flow of exhaust gas as a "fluid". However, the fluid is not limited thereto.

In the above embodiment, the valve member has only the arm portion provided at the end portion on the gear portion side among the end portions in the direction along the rotation axis of the valve member side seal portion. However, the valve member may have an arm part on the opposite side which is provided at the end on the side opposite to the gear part among the ends in the direction along the rotation axis of the valve member side seal part. However, the arm part on the opposite side is not located on the rotating shaft of the rotating member. That is, the shaft is not provided in the arm part on the opposite side. Thereby, when inserting the support jig shown in FIG. 11 into a valve housing, it does not interfere with a support jig.

In the above embodiment, two bearings are assumed to be provided. However, the number of bearings may be one or three or more.

In the fourth embodiment, the engagement portion has a protrusion as "convex" and a recess as "concave". However, it may be a through hole penetrating in the direction along the axis of rotation of the rotating member as "concave".

In the above embodiment, the shaft portion and the engaging portion of the upper shaft are formed separately, but may be formed integrally.

In the above embodiment, the shaft portion has a concave portion on the outer wall surface of the radially outer side of the portion inserted into the arm portion. The recess may not be present.

In the above embodiment, it is assumed that the shaft portion is provided so that the cross section on the side opposite to the gear portion is exposed from the arm portion. However, the end face of the shaft may not be exposed. In addition, the shaft part has a hole provided with the bottom in which the protrusion part of a support jig | tool is inserted in the cross section exposed from the arm part. However, there may be no hole in the bottom.

In the above embodiment, the end face on the side opposite to the gear portion of the shaft portion is formed to be flush with the inner wall surface of the arm portion. However, it may not be the same plane. The cross section of the shaft portion may protrude.

In the above embodiment, the inner wall surface of the arm portion is assumed to be formed in a curved shape. However, it may be formed so as to be inclined linearly with respect to the rotating shaft.

In the above embodiment, ribs are formed on the inner wall surface of the valve member. But there is no need for ribs. In addition, the shape of the rib is not limited to the circular and radial shapes of the first embodiment, the inclined lattice shape of the fifth embodiment and the vertical lattice shape of the sixth embodiment.

In said embodiment, a gate mark was formed in the substantially center of the outer wall surface enclosed by the seal surface and the connection seal surface. However, the position of the gate is not limited thereto.

In the first embodiment, the engaging portion has three projections and two concave portions formed at the tip of the end portion formed to extend in the direction of the valve member side seal portion from the rotational shaft. However, the number of protrusions and recesses is not limited to this.

As mentioned above, this invention is not limited to such embodiment, It can implement in various forms in the range which does not deviate from the summary.

Claims (14)

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 one flow path is installed in the communication space so as to be relatively rotatable with respect to the valve housing, and comes into contact with one flow path 14 of the plurality of flow paths and the edge portion 17 of the opening communicating the communication space. Valve members (21, 71, 81) that can block the communication space with;
Rotating shafts (25, 45, 55, 65) rotatably installed on the shafts (RA20, RA40, RA50, RA60) of the valve member and integrally with the valve member;
A driving force generator 35 for generating a driving force capable of rotating the valve member; And
It is provided with a connecting portion 37 for connecting the driving force generating unit and the rotary shaft,
The valve member is provided on the valve member side seal portion 22, 72, 82 and the valve member side seal portion that can contact the edge portion, and is connected to the valve member side seal portion from an end portion of the valve member side seal portion. Having arm portions 23, 73, 83 formed to extend in one direction,
The valve member is rotatably supported relative to the valve housing by only the rotating shaft installed in the arm portion.
Valve device.
The method of claim 1,
A bearing 271 and 272 mounted to the valve housing and rotatably supporting the rotary shaft;
The bearing is provided with a plurality
Valve device.
The method of claim 1,
The valve member side seal portion and the arm portion are integrally formed of resin,
The rotating shaft has a shaft portion (26) located on the rotating shaft and engaging portions (27, 47, 57) which are formed inside the arm portion and protrude in the radially outward direction of the shaft portion,
The engagement portion changes as the length in the radial direction seen from the point on the rotation axis is directed in the circumferential direction.
Valve device.
The method of claim 3,
The portion that changes as the length in the radial direction seen from the point on the rotation axis of the engagement portion toward the circumferential direction is provided in an area except the weld line 228 of the valve member.
Valve device.
The method of claim 1,
The valve member side seal portion and the arm portion are integrally formed of resin,
The rotating shaft has a shaft portion 26 located on the rotating shaft and an engaging portion 67, which is located inside the arm portion and protrudes in the radially outward direction of the shaft portion,
The engaging portion has unevenness (671, 672) in the direction along the axis of rotation
Valve device.
The method of claim 3,
The shaft portion and the engaging portion is formed separately
Valve device.
The method according to any one of claims 3 to 6,
The shaft portion has a concave portion 262 on an outer wall of the radially outer side of a portion located inside the arm portion.
Valve device.
The method according to any one of claims 3 to 6,
The shaft portion is exposed to the cross section 263 opposite to the connecting portion
Valve device.
The method of claim 8,
The shaft portion has a concave space 264 in the cross section opposite to the connecting portion.
Valve device.
The method of claim 8,
The shaft portion has a cross section opposite to the connecting portion is flush with the surface 231 opposite to the connecting portion of the arm portion.
Valve device.
The method according to any one of claims 3 to 6,
At least one of the surface 226 on the side opposite to the surface that can contact the edge portion of the valve member side seal portion and the surface on the side opposite to the connecting portion of the arm portion is inclined or curved with respect to the axis of rotation of the valve member. Formed
Valve device.
The method of claim 1,
The surface on the side opposite to the surface that can abut on the edge portion of the valve member side seal portion and the surface on the side opposite to the connecting portion of the arm portion have ribs 227, 74, 84.
Valve device.
The method of claim 12,
The valve member side seal portion has an annular seal surface 222, 223, 224 abutting the edge portion,
The rib is formed in at least one of a circular shape or a radial shape from the center of the seal surface.
Valve device.
The method of claim 11,
The valve member side seal portion has an annular seal surface that abuts the edge portion,
Gate 225 for injecting a resin forming the valve member is provided in the center of the seal surface
Valve device.

Images