JP7099026B2 - Valve device - Google Patents

Description

The present invention relates to a valve device.

Conventionally, a valve device that is provided on a flow path through which a fluid can flow and can control the flow of the fluid is known. 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 housing, a valve member, and a valve device including a shaft that is rotatably provided together with the valve member and is inserted into a through hole of the valve housing.

Japanese Unexamined Patent Publication No. 2017-8870

In the valve device described in Patent Document 1, the valve member has a seal portion located radially outside the valve member's rotation axis and a direction from both ends in the direction along the rotation axis of the seal portion toward the rotation axis. It has two arms that are formed to extend. The shaft is provided along the axis of rotation at each of the two arm portions. That is, the valve member is rotatably supported by two shafts located on the axis of rotation.

In the valve device described in Patent Document 1, when a member in which a valve member and a shaft are integrated is assembled to a 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 provide the jig so as to avoid the other shaft different from the shaft to be press-fitted. Therefore, it takes time to assemble the member in which the valve member and the shaft are integrated to the valve housing.

The present invention has been made in view of the above points, and an object of the present invention is to provide a valve device capable of reducing man-hours during manufacturing.

The valve device of the present invention includes a valve housing (10), a valve member (21), a rotary shaft (25), a driving force generating portion (35), and a connecting portion (37).

The valve housing has a plurality of flow paths (12, 13, 14) through which the fluid can flow, and a communication space (110) for communicating the plurality of flow paths.

The valve member is provided in the communication space so as to be rotatable relative to the valve housing, and when it comes into contact with the edge of the opening that communicates one flow path and the communication space of a plurality of flow paths, the one flow path and the communication space are contacted. And can be blocked.

The rotary shaft is provided on the rotary shaft (RA20) of the valve member and can rotate integrally with the valve member.

The driving force generating unit generates a driving force that can rotate the valve member.

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

In the valve device of the present invention, the valve member is provided on the valve member side seal portion (22) capable of contacting the edge portion and the connection portion side of the valve member side seal portion, and is provided on the connection portion side of the valve member side seal portion. It has an arm portion (23) formed so as to extend in one direction from the end portion of the. Further, the valve member is rotatably supported with respect to the valve housing only by a rotating shaft provided on the arm portion.

In the valve device of the present invention, the valve member is rotatably supported only by the rotating shaft provided on 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 side opposite to the connecting portion of the valve member side sealing portion. As a result, when assembling the member in which the valve member and the shaft are integrated to the valve housing, a jig for supporting the load for press-fitting can be relatively easily inserted along the rotation axis. Therefore, in the valve device of the present invention, the time required for the step of assembling the member in which the valve member and the shaft are integrated to the valve housing can be shortened, so that the man-hours at the time of manufacturing can be reduced.

Further, in the valve device of the present invention, the valve member side seal portion and the arm portion are integrally formed of resin. The rotating shaft includes a shaft portion (26) located on the rotating shaft and an engaging portion (25, 45, 55, 67) located inside the arm portion and formed so as to project in the out-of-diameter direction of the shaft portion. ). The engaging portion has a radial length seen from a point on the rotation axis that changes toward the circumferential direction, or has irregularities (671,672) in the direction along the rotation axis.

In the valve device of the present invention, the rotary shaft provided in the arm portion has an engaging portion located inside the arm portion and formed so as to project in the out-of-diameter direction of the shaft portion. Since the engaging portion changes in the radial length seen from a point on the rotation axis toward the circumferential direction or has irregularities in the direction along the rotation axis, the relative rotation of the valve member with respect to the rotation shaft is caused. It is suppressed by the engagement with the arm part. As a result, even if the valve member is rotatably supported by a so-called cantilever type, the rotary shaft can be pulled out in the direction along the rotary shaft while preventing the valve member and the rotary shaft from coming off in the circumferential direction of the rotary shaft. Can be prevented.
In the present invention, the valve housing is formed separately from the casing (111) forming the flow path and the communication space, the opening communicating with the communication space at the end face opposite to the connecting portion of the casing, and the casing. It has a bottom cover (113) that closes the opening. The valve member and shaft are provided so that the rotating shaft passes through the opening and the bottom cover without passing through the valve member.

It is a schematic diagram of the engine system to which the valve device by 1st Embodiment is applied. It is an external view of the valve device by 1st Embodiment. FIG. 3 is a view taken along the line III of FIG. FIG. 3 is a sectional view taken along line IV-IV of FIG. It is a schematic diagram explaining the operation of the valve device by 1st Embodiment. It is a perspective view of the rotating member provided in the valve device by 1st Embodiment. It is a VII arrow view of FIG. FIG. 7 is a sectional view taken along line VIII-VIII of FIG. It is an IX arrow view of FIG. It is an X arrow view of FIG. It is a schematic diagram explaining the manufacturing process of the valve device by 1st Embodiment. It is a top view of the rotating member provided in the valve device by 2nd Embodiment. It is a top view of the rotating member provided in the valve device according to 3rd Embodiment. It is a top view of the rotating member provided in the valve device by 4th Embodiment. It is a perspective view of the rotating member provided in the valve device by 5th Embodiment. It is a perspective view of the rotating member provided in the valve device by the 6th Embodiment. It is a schematic diagram explaining the manufacturing process of the valve device of the comparative example.

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In the plurality of embodiments, substantially the same parts are designated by the same reference numerals, and the description thereof will be omitted.

(First Embodiment)
The valve device 1 according to the first embodiment will be described with reference to FIGS. 1 to 11. The valve device 1 is applied to an engine system 90 that generates a driving force by burning fuel. First, the 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 recirculation system 95, and the like. The engine 91 has a well-known structure in which the piston 912 is housed in the cylinder 911 to form the 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 open 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 the air taken in from the atmosphere. The intercooler 924 cools the intake air compressed and heated by the compressor 941 of the supercharger 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 discharged 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 gas 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 the same number of passages as the number of cylinders 911 join. The exhaust purification unit 933 is provided in the exhaust pipe 931. The exhaust gas purification unit 933 decomposes hydrocarbons contained in the exhaust gas and captures fine particle substances.

The supercharger 94 uses the energy of the exhaust to compress the intake air in the intake pipe 921 and supercharge the pressurized intake air to the combustion chamber 910. The turbocharger 94 includes a compressor 941, a turbine 942, and a shaft 943. The compressor 941 is arranged between the air cleaner 923 and the intercooler 924 in the intake passage 920. The compressor 941 can compress the intake air. The turbine 942 is arranged 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 gas. The shaft 943 connects the compressor 941 and the turbine 942. The compressor 941 and the turbine 942 rotate synchronously with the shaft 943.

The exhaust gas return system 95 returns 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 passing through the air cleaner 923. The exhaust gas recirculation system 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 that recirculates the exhaust gas after passing through the turbine 942 to the air before compression by the compressor 941. The EGR cooler 952 is provided in the EGR tube 951. The EGR cooler 952 cools the gas passing through the EGR passage 950.

The valve device 1 is provided at a position 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 CPU as a calculation unit, a microcomputer having a RAM, a ROM, and the like 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 drive status of the vehicle or device on which the engine system 90 is mounted and the operation content of the operator who operates the vehicle or device.

Next, the detailed configuration of the valve device 1 will be described with reference to FIGS. 2 to 10. The valve device 1 is a rotary valve capable of increasing or decreasing the opening degree of the fluid passage by rotationally driving the 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 rotating member 20, two bearings 28 and 29, a drive unit 35 as a "driving force generating unit", and a gear unit 37 as a "connecting unit".

The valve housing 10 includes a casing 111, a sensor cover 112, a bottom cover 113, a tubular member 16, a housing-side sealing member 17 as an “opening edge”, and the like.

The casing 111 is formed of a metal material such as aluminum so as to accommodate the rotating member 20. 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 has a valve chamber 110 as a “communication space”, an upstream flow path 12 as a “flow path”, and a downstream flow path 13 as a “flow path”. It also has a casing 14 as a "flow path" and a "one flow path".

The valve chamber 110 is formed so as to be able to rotatably accommodate the rotating member 20.

The upstream side flow path 12 is formed so as to communicate with the valve chamber 110. The upstream flow path 12 communicates with the air cleaner 923.

The downstream side flow path 13 is formed so as to communicate with the valve chamber 110 separately from the upstream side flow path 12. The downstream side flow path 13 is formed coaxially with the upstream side flow path 12. The downstream flow path 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 side flow path 12 and the downstream side flow path 13. The accommodation space 14 is formed so as to be able to accommodate the tubular member 16 to which the housing-side seal member 17 is assembled. The accommodation space 14 communicates with the EGR passage 950.

As shown in FIG. 4, the casing 111 has a wall body 114 forming the valve chamber 110. The wall body 114 has a through hole 101 through which the upper shaft 25 is inserted. Bearings 28 and 29 are provided on the inner wall forming the through hole 101 of the wall body 114.

The sensor cover 112 is provided on the side opposite to the valve chamber 110 when viewed 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 drive portion 35, the gear portion 37, and the like.

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 has a substantially flat plate shape and forms a valve chamber 110 together with the casing 111.

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

The flange portion 161 is a portion formed in a substantially annular shape. When the tubular member 16 is accommodated in the accommodation space 14, the flange portion 161 abuts on the stepped surface 141 provided on the inner wall forming the accommodation space 14, as shown in FIG. At this time, the tubular 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 stepped surface 141 via the wave washer 192.

The first side wall portion 162 and the second side wall portion 163 are formed so as to extend along the central axis direction of the flange portion 161 from the end surface that abuts on the stepped surface 141 of the flange portion 161. The first side wall portion 162 and the second side wall portion 163 are formed so as 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 so that the central angle is 180 degrees. The first side wall portion 162 is formed so 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. ..

The housing-side sealing 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 so as to cover the radial inner side, the radial outer side, and the end portion on the side opposite to the flange portion 161 side of the first side wall portion 162.

The first seal lip portion 172 is a lip-shaped 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 so as to cover the first side wall portion 162, the first seal lip portion 172 is provided in the outer diameter direction of the first side wall portion 162, that is, the diameter of the flange portion 161. It is formed so as to project outward.

The second covering portion 173 is a portion connecting to the radial inner side and the radial outer side of the second side wall portion 163, the end portion on the side 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.

The second seal lip portion 174 is a lip-shaped 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 so as to cover the second side wall portion 163, the second seal lip portion 174 is provided in the radial direction of the second side wall portion 163, that is, the diameter of the flange portion 161. It is formed so as to project inward.

The rotating member 20 is rotatably housed in the valve housing 10. When the rotating member 20 comes into contact with the housing-side sealing member 17, the accommodating space 14 and the valve chamber 110 can be shut off. The 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 and rotatably support the rotating member 20.

The drive unit 35 is, for example, a DC type motor having a sliding contact structure between a brush and a commutator. The drive unit 35 is electrically connected to the ECU 96 via the connector 116 of the valve housing 10. The drive unit 35 generates a driving force that can rotate the rotating member 20 under the control of the ECU 96.

The gear unit 37 has a plurality of gears, and amplifies the torque of the drive unit 35 according to the reduction ratio and transmits the torque to the upper shaft 25. The gear portion 37 has a small diameter that is supported by a central shaft common to the pinion gear 371 attached to the output shaft of the drive portion 35, the intermediate reduction gear 372 that meshes with the pinion gear 371, and the intermediate reduction gear 372 and rotates integrally with the intermediate reduction gear 372. It has a gear 373 and a valve gear 374.

The valve gear 374 is provided so as 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 for urging the rotating member 20 so as to rotate the rotating member 20 in the EGR passage blocking direction is provided between the valve gear 374 and the casing 111.

The detection unit 38 has a magnet 381 and a hole 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 on 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 drive unit 35 so that the rotation angle of the rotating 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.

Next, the detailed configuration of the rotating member 20 will be described with reference to FIGS. 4 to 11. 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 rotatably provided.

The valve member 21 has a valve member side seal portion 22 and an arm portion 23. The valve member side sealing 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 housed in the valve chamber 110 and is provided so as to be rotatable relative to the valve housing 10 (see the solid line arrows R5 and R6 in FIG. 5). Here, regarding the rotation direction of the valve member 21, for convenience, the direction indicated by the solid line arrow R5 is referred to as "EGR passage blocking direction", and the direction indicated by the solid line arrow R6 is referred to as "EGR passage opening direction". In addition, in FIG. 5, the rotating member 20 at various positions is shown by a solid line or a dotted line. Specifically, the rotating member 20 in the state where the EGR passage 950 is blocked is the rotating member 20a, and the rotating member 20 in the state where the intake passage 920 is fully opened while the EGR passage 950 is partially opened is the rotating member 20b. The rotating member 20 in a state where the intake passage 920 is blocked is shown as the rotating member 20c.

The valve member-side seal portion 22 has an outer wall surface 221 that can abut on the housing-side seal member 17 on the outer side in the radial direction with respect to the rotary shaft RA20. The outer wall surface 221 is formed so as to have the same shape as a part of the wall surface on the radial outer side of the cylinder. As shown in FIG. 6, the outer wall surface 221 has a sealing surface 222, 223, and a connecting sealing surface 224 as a “sealing surface”.

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

The sealing surface 222 is formed on the outer wall surface 221 so as to face the EGR passage blocking direction. The sealing surface 222 has the same shape as a part of the inner wall surface of the side wall on the radial outer side of the cylinder. In the present embodiment, the sealing surface 222 has a semi-cylindrical shape with a central angle of 180 degrees. The sealing surface 222 is formed so that the radius is larger than the radius of the sealing surface 223.

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

The virtual cylindrical surface including the sealing surface 222 and the virtual cylindrical surface including the sealing surface 223 have a central axis coaxially. 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 on the outer wall surface 221 so as to face the EGR passage blocking direction. The connection seal surface 224 is formed so as to be orthogonal to the seal surfaces 222 and 223. The normal of the connection seal surface 224 is orthogonal to the rotation axis RA20 when translated.

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

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

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

Further, in the present embodiment, by controlling the rotation angle of the valve member 21, it is possible to increase or decrease the opening degree of the intake passage 920 together with the opening degree of the EGR passage 950 with respect to the intake passage 920. As a result, the magnitude of the negative pressure in the intake passage 920 can be controlled. Therefore, for example, the engine flows into the intake passage 920 by controlling the rotation angle of the valve member 21 instead of using the negative pressure generated in the engine 91. It is possible to control the displacement (see, for example, the state of the rotating member 20b in FIG. 5).

A plurality of ribs 227 are formed on the inner wall surface 226 as the "surface opposite to the surface that can abut on the edge portion" of the valve member side seal portion 22. As shown in FIG. 10, the plurality of ribs 227 are formed in a plurality of concentric circular shapes from the center C22 of the region surrounded by the sealing surface 222, 223 and the connecting sealing surface 224, and radially from the center C22. There is.

As shown in FIG. 4, the arm portion 23 is provided at the end portion of the valve member side seal portion 22 in the direction along the rotation shaft RA20 on the gear portion 37 side. The arm portion 23 is a substantially fan-shaped portion formed so as to extend in a direction toward the rotation shaft RA20 as a “one direction” from the end portion of the valve member side seal portion 22 on the gear portion 37 side (FIGS. 6 and 6). 7). As shown in FIG. 8, a part of the upper shaft 25 is inserted into the end portion of the arm portion 23 on the side opposite to the side connected to the valve member side seal portion 22.

FIG. 8 shows a cross-sectional view of the valve member 21 on a virtual surface including the rotation shaft RA20. In FIG. 8, for convenience, the boundary between the valve member side seal portion 22 and the arm portion 23 is shown by a two-dot chain line VL20. As shown in FIG. 8, the inner wall surface 231 as the “plane opposite to the connecting portion” of the arm portion 23 is formed so as to be smoothly connected to the inner wall surface 226 of the valve member side sealing portion 22. In the present embodiment, in the cross-sectional view shown in FIG. 8, the inner wall surface 231 of the arm portion 23 is formed in a curved shape. As a result, when the rotating member 20 is at a position where the EGR passage 950 is blocked, specifically, at a position indicated by the rotating member 20b or the rotating member 20c in FIG. 5, upstream as shown in FIG. The rotating member 20 is not located between the side flow path 12 and the downstream side flow path 13. A rib (not shown) connected to the rib 227 of the valve member side sealing portion 22 is formed on the inner wall surface 231 of the arm portion 23.

The upper shaft 25 is, for example, a member made of stainless steel. The upper shaft 25 has a shaft portion 26 and an engaging portion 27. In the present embodiment, the shaft portion 26 and the engaging portion 27 are formed as separate bodies.

As shown in FIG. 4, the shaft portion 26 is formed so as to extend from the end portion of the arm portion 23 on the rotation shaft RA20 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 recess 262 on the outer wall surface 261 on the radial outer side of the portion inserted into the arm portion 23. That is, the outer wall surface 261 of the portion inserted into the arm portion 23 of the shaft portion 26 is formed so as to 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 so as to be flush with the inner wall surface 231 of the arm portion 23. A bottomed hole 264 as a "concave space" is formed in the end face 263.

The engaging portion 27 is provided at a portion inserted into the arm portion 23 of the shaft portion 26. The engaging portion 27 is a substantially triangular flat plate-shaped member that is located inside the arm portion 23 and is formed so as to project in the out-of-diameter direction of the shaft portion 26. The engaging portion 27 is formed so that the radial length from the point on the rotation axis 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 so as to extend from the rotary shaft RA20 in the direction of the valve member side seal portion 22. A depression 272 is formed between the adjacent protrusions 271. In this embodiment, two recesses 272 are formed for the three protrusions 271. The three protrusions 271 and the two recesses 272 are provided in the region excluding the weld line 228 formed when the valve member 21 is formed of resin.

Next, the manufacturing method of the valve device 1 will be described while comparing with a comparative example. FIG. 11 shows a state of the press-fitting process of the upper shaft 25 into the bearings 28 and 29 in the manufacturing process of the valve device 1. Further, FIG. 17 shows a state of a press-fitting process of the upper shaft 25 into the bearings 28 and 29 in the manufacturing process of the valve device 9 of the comparative example.

Here, the configuration of the valve device 9 of the comparative example will be described. 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 rotating member 30 of the present embodiment, the rotating member 30 is provided with a lower shaft 33 that rotates integrally with the valve member 31 on the bottom cover 113 side of the valve member 31. As a result, the rotating member 30 is rotatably supported by the valve housing 10 by the upper shaft 25 and the lower shaft 33.

In the manufacturing process of the valve device 9 of the comparative example, when the upper shaft 25 is press-fitted into the bearings 28 and 29, the valve housing 10 supports the end surface 263 of the upper shaft 25 on the lower shaft 33 side as shown in FIG. The support jig 34 is inserted inside. At this time, as shown in FIG. 17, it is necessary to insert the support 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 device 1 of the present embodiment, when the upper shaft 25 is press-fitted into the bearings 28 and 29, the support jig 24 is inserted in the valve housing 10 along the rotary shaft RA20 as shown in FIG. It is possible to support the end face 263 of the upper shaft 25 by inserting it into the. At this time, in the present embodiment, the protrusion 241 formed at the tip of the support jig 24 can be inserted into the bottomed hole 264 of the shaft portion 26 to stabilize the protrusion 241.

In the valve device 1 according to the first embodiment, the valve member 21 is rotatably supported only by the upper shaft 25 provided on the arm portion 23 provided on the gear portion 37 side with respect to the valve member side seal portion 22. Has been done. That is, the rotating member 30 is not provided with a rotating shaft on the side of the valve member side sealing portion 22 opposite to the gear portion 37. As a result, when the rotating member 20 is assembled 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, so that the upper shaft 25 can be relatively easily inserted. Can be press-fitted into the bearings 28 and 29. Therefore, since the valve device 1 can shorten the time required for the step of assembling the rotating member 20 to the valve housing 10, the man-hours at the time of manufacturing can be reduced.

Further, in the valve device 1, the shape of the valve member 21 is simpler than, for example, the shape of the valve member 31 of the comparative example, so that the manufacturability of the valve member 21 can be improved.

In the valve device 1 according to the first embodiment, two bearings 28 and 29 that rotatably support the rotary member 20 are provided. As a result, the valve device 1 can reliably support the upper shaft 25 of the rotating member 20 that is rotated by the cantilever, so that the rotating member 20 can be rotated 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. As a result, the valve device 1 can improve the manufacturability of the valve member 21 and secure the strength between the valve member side seal portion 22 and the arm portion 23.

In the valve device 1 according to the first embodiment, the upper shaft 25 includes a shaft portion 26 located on the rotary shaft RA20 and an engaging portion 27 formed so as to project in the out-of-diameter direction of the shaft portion 26. Have. The engaging portion 27 inserted into the arm portion 23 changes in the radial length from the point on the rotation axis RA20 toward the circumferential direction. As a result, the valve device 1 can prevent the valve member 21 and the upper shaft 25 from coming off in the circumferential direction of the rotary shaft RA20, and prevent the upper shaft 25 from coming off in the direction along the rotary shaft RA20.

In the valve device 1 according to the first embodiment, the shaft portion 26 and the engaging portion 27 are formed separately. As a result, the valve device 1 can improve the degree of freedom in the shapes of the shaft portion 26 and the engaging portion 27. Therefore, by increasing the outer diameter of the engaging portion 27, it is possible to further prevent the upper shaft 25 from coming off in the direction along the rotating shaft RA20. Further, the engaging portion 27 formed in a flat plate shape can be easily formed by pressing. Thereby, 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 protrusions 271 and the two recesses 272 of the engaging portion 27 are provided in the region other than the weld line 228. This makes it possible to prevent the stress during rotation of the rotating member 20 from acting on the weld line 228, which has a relatively low strength. Therefore, it is possible to prevent the rotating member 20 from being damaged.

In the valve device 1 according to the first embodiment, the shaft portion 26 is formed to have unevenness by the recess 262 of the outer wall surface 261 on the outer side in the radial direction. As a result, the shaft portion 26 can also prevent the upper shaft 25 from coming off in the direction along the rotating 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. As a result, the load acting on the upper shaft 25 in the press-fitting process of the upper shaft 25 into the bearings 28 and 29 can be received by the metal shaft portion 26.

Further, in the valve device 1, when the end surface 263 of the shaft portion 26 and the support jig 24 are brought into contact with each other, the protrusion 241 of the support jig 24 is inserted into the bottomed hole 264 of the shaft portion 26. This makes it possible to prevent the support jig 24 from being displaced with respect to the shaft portion 26 in the press-fitting process of the upper shaft 25 into the bearings 28 and 29.

In the valve device 1 according to the first embodiment, the end surface 263 of the shaft portion 26 and the inner wall surface 231 of the arm portion 23 are formed to be flush with each other. As a result, when the valve member 21 is molded by the mold, the valve device 1 does not require a slide mold for exposing the end portion having the end surface 263 of the shaft portion 26, so that the mold splitting of the mold can be simplified. can do.

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 inner wall surface 226 of the valve member side sealing portion 22 are smoothly connected to each other. ing. From this, when the EGR passage 950 is blocked by the rotating member 20, the rotating member 20 is not located between the upstream side flow path 12 and the downstream side flow path 13, so that the upstream side flow path 12 and the downstream side flow path are not located. The pressure loss due to the rotating member 20 in the flow of the fluid between the 13 and the 13 can be reduced. Further, 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 sealing portion 22 have ribs 227. This makes it possible to reduce the rigidity of the valve member 21 while maintaining it to some extent. Further, the vibration resistance can be improved by making the valve member 21 lighter.

Further, the rib 227 of the valve member 21 is formed in a circular shape and in a radial shape. Thereby, when the valve member 21 is molded from the resin, it is possible to prevent a time difference from occurring in the arrival of the resin flowing to form the sealing surface 222, 223 and the connecting sealing surface 224. Therefore, the valve device 1 can form the sealing surface 222, 223 and the connecting sealing surface 224 with high accuracy.

Further, in the valve member 21, the gate for injecting the resin forming the valve member 21 is provided at a position corresponding to substantially the center of the outer wall surface 221 surrounded by the sealing surface 222, 223 and the connecting sealing surface 224. As a result, the valve device 1 can prevent a time difference from occurring in the arrival of the resin flowing to form the seal surface 222, 223 and the connection seal surface 224, so that the seal surface 222, 223 and the connection seal can be prevented from occurring. The surface 224 can be formed with higher precision.

(Second embodiment)
Next, the valve device according to the second embodiment will be described with reference to FIG. In the second embodiment, the shape of the engaging portion is different from that in the first embodiment.

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. The rotating member 40 can shut off the accommodation space 14 and the valve chamber 110 when it comes into contact with the housing side seal member 17. 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 an engaging portion 47. In the present embodiment, the shaft portion 26 and the engaging portion 47 are formed as separate bodies.

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 plate-shaped member that is located inside the arm portion 23 and is formed so as to project in the out-of-diameter direction of the shaft portion 26. The engaging portion 47 is formed so that the radial length of the rotating member 40 from a point on the rotating shaft RA40 changes in the circumferential direction. Specifically, as shown in FIG. 12, the tip of the end portion formed so as to extend from the rotary shaft RA40 in the direction of the valve member side seal portion 22 and the valve member side seal portion 22 from the rotary shaft RA40 It has a plurality of protrusions 471 at the tips of the ends that are formed to extend in opposite directions. A recess 472 is formed between the adjacent protrusions 471. The three protrusions 471 and the two recesses 472 are provided in the region excluding the weld line 228 formed when the valve member 21 is formed of the resin.

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

(Third embodiment)
Next, the valve device according to the third embodiment will be described with reference to FIG. In the third embodiment, the shape of the engaging portion is different from that in the first embodiment.

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 rotatably housed in the valve housing 10. The rotating member 50 can shut off the accommodation space 14 and the valve chamber 110 when it comes into contact with the housing side seal member 17. 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 made of stainless steel. The upper shaft 55 has a shaft portion 26 and an engaging portion 57. In the present embodiment, the shaft portion 26 and the engaging portion 57 are formed as separate bodies.

The engaging portion 57 is provided at a portion inserted into the arm portion 23 of the shaft portion 26. The engaging portion 57 is a flat plate-shaped member located inside the arm portion 23 and formed in a hexagonal shape.

In the valve device according to the third embodiment, the valve member 21 is rotatably supported only by the upper shaft 55. Further, the engaging portion 57 is formed so that the virtual surface shape perpendicular to the rotation axis RA50 of the rotating member 50 becomes a hexagonal shape. As a result, even if a force acts in the circumferential direction due to the rotation of the rotating member 50, the arm portion 23 engages with the side surface 571 of the engaging portion 57 to prevent the relative rotation between the valve member 21 and the upper shaft 55. Therefore, the third embodiment has the same effect as the first embodiment.

(Fourth Embodiment)
Next, the valve device according to the fourth embodiment will be described with reference to FIG. In the fourth embodiment, the shape of the engaging portion is different from that in 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. The rotating member 60 can shut off the accommodation space 14 and the valve chamber 110 when it comes into contact with the housing side seal member 17. 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 an engaging portion 67. In the present 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 plate-shaped member located inside the arm portion 23 and formed in a substantially circular shape having a center on the rotating shaft RA60 of the rotating member 60. The engaging portion 67 has a protrusion 671 as a "convex" protruding in the direction along the rotation shaft RA60 and a recess 672 as a "concave" recessed in the direction along the rotation shaft RA60.

In the valve device according to the fourth embodiment, the valve member 21 is rotatably supported only by the upper shaft 65. Further, the engaging portion 67 has a protrusion 671 and a recess 672 formed along the rotation shaft RA60. As a result, even if a force acts in the circumferential direction due to the rotation of the rotating member 60, the arm portion 23 engages with the protrusion 671 and the recess 672 to prevent the valve member 21 and the upper shaft 65 from relative rotation. Therefore, the fourth embodiment has the same effect as the first embodiment.

(Fifth Embodiment)
Next, the valve device according to the fifth embodiment will be described with reference to FIG. In the fifth embodiment, the shape of the rib of the valve member is different from that of 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 comes into contact with the housing-side sealing member 17, the accommodation space 14 and the valve chamber 110 can be shut off. 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. As shown in FIG. 15, the ribs 74 are formed in an oblique lattice pattern. The structure of the valve member 71 is the same as that of the valve member 21 except for the ribs.

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 has the same effect as the first embodiment.

Further, in the valve device according to the fifth embodiment, the valve member 71 has ribs 74 formed in an oblique lattice pattern on the inner wall surfaces 726 and 731. As a result, the strength of the valve member 71 can be improved while being lightened.

(Sixth Embodiment)
Next, the valve device according to the sixth embodiment will be described with reference to FIG. In the sixth embodiment, the shape of the ribs of the valve member is different from that of 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. The rotating member 80 can shut off the accommodation space 14 and the valve chamber 110 when it comes into contact with the housing side seal member 17. 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. As shown in FIG. 16, the ribs 84 are formed in a vertical lattice pattern. The structure of the valve member 81 is the same as that of the valve member 21 except for the ribs.

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

Further, in the valve device according to the sixth embodiment, the valve member 81 has ribs 84 formed in a vertical lattice pattern on the inner wall surfaces 820 and 831. As a result, the strength of the valve member 81 can be improved while being lightened.

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

In the above-described embodiment, the valve member has only an arm portion provided at the end portion on the gear portion side of 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 portion on the opposite side provided at the end portion of the end portion of the valve member side seal portion in the direction along the rotation axis, which is opposite to the gear portion. However, the arm portion on the opposite side is not located on the rotation axis of the rotating member. That is, no shaft is provided on the opposite arm portion. As a result, when the support jig shown in FIG. 11 is inserted into the valve housing, it does not interfere with the support jig.

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

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

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

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

In the above-described embodiment, the shaft portion is provided so that the end face on the side opposite to the gear portion is exposed from the arm portion, however, the end face of the shaft portion may not be exposed. Further, it is assumed that the shaft portion has a bottomed hole in which the protrusion of the support jig is inserted in the end surface exposed from the arm portion. However, the bottomed hole may not be present.

In the above-described embodiment, it is assumed that the end surface of the shaft portion opposite to the gear portion is formed so as to be flush with the inner wall surface of the arm portion. However, it does not have to be on the same surface. The end face of the shaft portion may be protruding.

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

In the above embodiment, it is assumed that ribs are formed on the inner wall surface of the valve member. However, the ribs may not be present. Further, the shape of the rib is not limited to the circular shape and radial shape of the first embodiment, the diagonal grid shape of the fifth embodiment, and the vertical grid shape of the sixth embodiment.

In the above-described embodiment, it is assumed that a gate mark is formed substantially in the center of the outer wall surface surrounded by the sealing surface and the connecting sealing surface. However, the position of the gate is not limited to this.

In the first embodiment, it is assumed that the engaging portion has three protrusions and two recesses formed at the tip of an end portion formed so as to extend from the rotation shaft in the direction of the valve member side seal portion. However, the number of protrusions and depressions is not limited to this.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various embodiments without departing from the gist thereof.

1 ... Valve device 10 ... Valve housing 110 ... Valve chamber (communication space)
21,71,81 ... Valve member 22,72,82 ... Valve member side seal portion 23,73,83 ... Arm portion 25,45,55,65 ... Rotating shaft 35 ... Drive Part (driving force generating part)
37 ... Gear part (connecting part)
RA20, RA40, RA50, RA60 ... Rotating shaft

Claims (15)

A valve housing (10) having a plurality of flow paths (12, 13, 14) capable of flowing a fluid and a communication space (110) communicating the plurality of flow paths.
The communication space is provided so as to be rotatable relative to the valve housing, and when it comes into contact with the edge portion (17) of the opening that communicates one of the plurality of flow paths (14) with the communication space. A valve member (21, 71, 81) capable of blocking one flow path and the communication space, and
A rotating shaft (25, 45, 55, 65) provided on the rotating shaft (RA20, RA40, RA50, RA60) of the valve member and rotatable integrally with the valve member, and
A driving force generating unit (35) that generates a driving force that can rotate the valve member,
A connecting portion (37) connecting the driving force generating portion and the rotating shaft,
Equipped with
The valve member is provided on the valve member side sealing portion (22, 72, 82) capable of contacting the edge portion and on the connecting portion side of the valve member side sealing portion, and is the valve member side sealing portion. It has an arm portion (23,73,83) formed to extend in one direction from the end portion on the connecting portion side, and has an arm portion (23,73,83).
The valve member is rotatably supported with respect to the valve housing only by the rotating shaft provided on the arm portion .
The valve housing is separate from the casing (111) forming the flow path and the communication space, the opening communicating with the communication space at the end surface of the casing opposite to the connecting portion, and the casing. Has a bottom cover (113) formed in and closes the opening.
The valve member and the shaft are valve devices provided so that the rotating shaft passes through the opening and the bottom cover without passing through the valve member . The opening allows a support jig (24) to be inserted along the rotation axis when the valve member and the shaft are integrated to the valve housing, and the shaft portion is said to have the support jig (24). The valve device according to claim 1, wherein the end face (263) on the opposite side to the connecting portion is formed so as to be able to be supported by the support jig. Further provided with bearings ( 28 , 29 ) provided in the valve housing to rotatably support the rotary shaft.
The valve device according to claim 1 or 2 , wherein the bearing is provided in a plurality of parts. 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 ( 27 ,) located inside the arm portion and formed so as to project in the out-of-diameter direction of the shaft portion. Has 4 7 , 5 7 ) and has
The valve device according to any one of claims 1 to 3, wherein the engaging portion changes in the radial length seen from a point on the rotation axis toward the circumferential direction. The portion where the radial length seen from the point on the rotation axis of the engaging portion changes in the circumferential direction is provided in the region excluding the weld line ( 228) of the valve member according to claim 4 . The valve device described. The valve member side seal portion and the arm portion are integrally formed of resin.
The rotating shaft includes a shaft portion (26) located on the rotating shaft and an engaging portion (67) located inside the arm portion and formed so as to project in the out-of-diameter direction of the shaft portion. Have and
The valve device according to any one of claims 1 to 3, wherein the engaging portion has irregularities (671,672) in the direction along the rotation axis. The valve device according to any one of claims 4 to 6 , wherein the shaft portion and the engaging portion are separately formed. The valve device according to any one of claims 4 to 7 , wherein the shaft portion has a recess (262) in the outer wall on the radial outer side of a portion located inside the arm portion. The valve device according to any one of claims 4 to 8 , wherein the shaft portion has an exposed end surface (263) opposite to the connecting portion. The shaft portion has a concave space (264) on the end surface opposite to the connecting portion .
The valve device according to claim 9 , wherein the concave space is formed so that a protrusion (241) at the tip of a support jig (24) can be inserted . The valve device according to claim 9 or 10 , wherein the shaft portion has an end surface opposite to the connecting portion flush with the surface (231) of the arm portion opposite to the connecting portion. At least one of the surface (226) of the valve member side seal portion opposite to the surface capable of contacting the edge portion and the surface of the arm portion opposite to the connecting portion is the rotation shaft of the valve member. The valve device according to any one of claims 4 to 11 , which is formed so as to be inclined with respect to a curved surface or curved surface. Claimed that the surface of the valve member side seal portion opposite to the surface capable of contacting the edge portion and the surface of the arm portion opposite to the connecting portion have ribs (227,74,84). The valve device according to any one of 1 to 12 . The valve member side sealing portion has an annular sealing surface (222,223,224) that abuts on the edge portion.
13. The valve device according to claim 13 , wherein the rib is formed in at least one of a circular shape and a radial shape from the center of the sealing surface. The valve member side sealing portion has an annular sealing surface that abuts on the edge portion.
The valve device according to any one of claims 12 to 14 , wherein the gate for injecting the resin forming the valve member is provided in the center of the sealing surface.

Images