JP6939341B2 - Valve device and manufacturing method of valve device - Google Patents

Description

The present invention relates to a valve device and a method for manufacturing the valve device.

Conventionally, a valve device for opening and closing a valve body coupled to a drive shaft by rotation of the drive shaft is known. For example, Patent Document 1 discloses a double eccentric valve in which the center of rotation of the valve body is arranged eccentrically from the center of the valve hole and the sealing surface of the valve body is arranged eccentrically from the center of rotation of the valve body. There is.

International Publication 2015/098952

In order to increase the diameter of the valve body in the double eccentric valve of Patent Document 1, it is necessary to increase the amount of eccentricity between the valve body and the drive shaft. Further, in order to secure a large amount of eccentricity while maintaining the strength of the joint portion between the valve body and the drive shaft, it is necessary to increase the diameter of the drive shaft. However, if the diameter of the drive shaft is increased, the physique and weight will increase, and the pressure loss of the fluid flowing through the flow path will increase.

In addition, when assembling the drive shaft and valve body to the housing, the valve body and valve seat may be misaligned due to errors in component dimensions and variations in assembly work, but the drive shaft and valve body are directly connected. Since the degree of freedom of adjustment at the time of assembly is small in the configured configuration, it is not possible to make appropriate adjustments. As a result, leakage may occur due to the gap between the seal surface and the seat surface at the valve closed position.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a valve device capable of increasing the amount of eccentricity without increasing the diameter of the drive shaft. Another object of the present invention is a method for manufacturing a valve device capable of adjusting the misalignment between the valve body and the valve seat when assembling the drive shaft and the valve body to the housing and reducing leakage at the valve closed position. To provide.

The valve device of the present invention includes a housing (91), a valve body (30), a drive shaft (10), and a joint (201-204).

The housing has a valve hole (46) constituting the flow path (42) and a valve seat (45) including an annular seat surface (47) formed at the edge of the valve hole. The valve body includes a plate portion (33) having an annular sealing surface (34) centered on the valve axis (V) corresponding to the seat surface formed on the outer periphery, and a sealing surface from the plate portion along the valve axis. It has a protrusion (31) protruding to the opposite side and having an insertion hole (32) formed orthogonal to the valve axis.

The drive shaft is inserted into the drive shaft insertion hole (95) formed in the housing and is rotatable about a drive shaft line (D) extending in parallel with the radial direction of the valve hole. The joints are provided on the first joint axis (J1) and connected to the drive shaft, the first joint (22, 23), and the valve provided on the second joint axis (J2) eccentric from the first joint axis. It has a second joint (24, 25) that directly or indirectly connects with the insertion hole of the body, and relays the connection between the drive shaft and the valve body. The valve body coupled to the drive shaft rotates about the drive shaft line, and can rotate between the valve closing position where the seal surface abuts on the seat surface and the valve opening position where the seal surface separates from the seat surface. be.

At the valve closing position of the valve body, the drive axis is eccentric from the valve axis in the X direction, which is the direction orthogonal to the drive axis in the radial direction of the valve body, and in the direction of the valve axis from the insertion hole of the valve body. It is arranged eccentrically in a certain Y direction. With the joint connected to the drive shaft, the first joint axis is parallel to the drive axis, and the maximum distance (Rmax) from the drive axis to the outer edge of the second joint of the joint is greater than the radius (Ra) of the drive shaft. It is set large.

With this configuration, in the valve device of the present invention, the amount of eccentricity required to increase the valve body diameter can be secured while maintaining the strength of the coupling portion and without increasing the diameter of the drive shaft. .. Therefore, problems such as an increase in body size, weight, and pressure loss due to an increase in the diameter of the drive shaft can be appropriately avoided.

Further, the method for manufacturing the valve device of the present invention includes a setting step (S1), an X direction adjusting step (S2), and a Y direction adjusting step (S3). In the setting process, the drive shaft is inserted into the drive shaft insertion hole of the housing, and the valve body is set with respect to the valve seat in a state where the drive shaft, the joint, and the valve body are fitted to each other so as to be relatively rotatable. In the X-direction adjustment step, the drive shaft and the first joint axis are rotated while the joint is rotated with respect to the drive shaft so that the radial positional deviation between the valve body and the valve seat at the valve closed position approaches zero. Adjust the relative position in the X direction to fix the joint and the drive shaft. After the X-direction adjustment step, in the Y-direction adjustment step, the drive shaft and the joint are rotated with respect to the valve body so that the axial misalignment between the valve body and the valve seat at the valve closed position approaches zero. , Adjust the relative position of the valve body and the drive axis in the Y direction, and fix the joint and the valve body.

In this manufacturing method, in the X-direction adjustment step and the Y-direction adjustment step, the drive shaft, the joint, and the valve body so that the radial and axial misalignment between the valve body and the valve seat at the valve closed position approaches zero. The relative position of is adjusted and fixed. Therefore, it is possible to suppress the occurrence of leakage due to the gap between the seal surface and the seat surface at the valve closed position.

The perspective view of the valve device according to 1st Embodiment. FIG. 5 is a schematic side view of a valve body in the valve device of FIG. FIG. 2 is a cross-sectional view taken along the line III-III of FIG. FIG. 2 is a sectional view taken along line IV-IV of FIG. The flowchart of the manufacturing method of the valve device according to 1st Embodiment. The schematic diagram explaining (a) X direction adjustment process and (b) Y direction adjustment process. FIG. 3 is a schematic view corresponding to FIG. 3 of the valve device according to the second embodiment. FIG. 3 is a schematic view corresponding to FIG. 3 of the valve device according to the third embodiment. FIG. 3 is a schematic view corresponding to FIG. 3 of the valve device according to the fourth embodiment.

Hereinafter, a plurality of embodiments of the valve device will be described with reference to the drawings. In a plurality of embodiments, substantially the same configuration is designated by the same reference numerals and the description thereof will be omitted. The valve device of the present embodiment is applied to an EGR valve that opens and closes an EGR gas passage and adjusts the opening degree in an exhaust gas recirculation (hereinafter referred to as “EGR”) system that returns a part of exhaust gas to an intake passage. The basic use and function of the EGR valve are the same as those disclosed in Patent Document 1 (International Publication No. 2015/098952).

(First Embodiment)
The first embodiment will be described with reference to FIGS. 1 to 6. First, the overall structure of the EGR valve will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the EGR valve 90 includes a valve portion 92, a motor portion 93, a speed reduction mechanism portion 94, and the like housed in the housing 91. The housing 91 has a valve seat 45 in the flow path 42 in the pipe portion 41 through which the EGR gas flows. Further, the housing 91 is formed with a drive shaft insertion hole 95 that opens in the inner wall of the flow path 42.

As shown in FIG. 2, the valve seat 45 includes a valve hole 46 constituting the flow path 42 and an annular seat surface 47 formed at the edge of the valve hole 46. The valve body 30 has a plate portion 33 and a protrusion 31 on the valve axis V, which is the axis. The plate portion 33 has an annular sealing surface 34 centered on the valve axis V formed on the outer periphery corresponding to the seat surface 47 of the valve seat 45. At the valve closing position where the seal surface 34 of the valve body 30 is in contact with the seat surface 47 of the valve seat 45, the valve axis V coincides with the axis of the valve hole 46.

The valve portion 92 includes a drive shaft 10, a joint 201 and a valve body 30 coupled to each other. Typically, the drive shaft 10, the joint 201 and the valve body 30 are all made of a weldable metal material. The drive shaft 10 is inserted into the drive shaft insertion hole 95 of the housing 91. The torque of the motor built in the motor unit 93 is transmitted to the drive shaft 10 via the reduction mechanism unit 94, and the drive shaft 10 rotates about the drive axis D extending in parallel with the radial direction of the valve hole 46.

The valve body 30 coupled to the drive shaft 10 rotates about the drive axis D, and has a valve closing position where the seal surface 34 abuts on the seat surface 47 and a valve opening position where the seal surface 34 separates from the seat surface 47. It is rotatable between. The states of the valve closing position and the valve opening position are as referred to in FIGS. 2 and 3 of Patent Document 1.

Next, the coupling configuration of the drive shaft 10, the joint 201, and the valve body 30 will be described with reference to FIGS. 2 to 4. The present embodiment is different from the conventional double eccentric valve disclosed in Patent Document 1 in that a joint 201 that relays the connection between the drive shaft 10 and the valve body 30 is provided. In the following first to fourth embodiments, the code of the joint is the number of the embodiment in the third digit following "20". It should be noted that FIGS. 2 to 4 are schematic views for the purpose of showing the coupling configuration, and the diameter and length of the coupling portion may not exactly match between the drawings.

First, the three-dimensional X, Y, and Z directions in FIGS. 2 to 4 are defined. At the valve closing position of the valve body 30, the Y direction is the direction of the valve axis V, and the Z direction is the direction of the drive axis D. The X direction is a direction orthogonal to the Y direction and the Z direction, in other words, a direction orthogonal to the drive axis D in the radial direction of the valve body 30. The drive axis D is eccentric from the valve axis V in the X direction and eccentric from the insertion hole 32 of the valve body 30 in the Y direction.

The drive shaft 10 is provided with a drive side shaft portion 12 eccentric with respect to the drive axis D at the end portion on the joint 201 side. The joint 201 has a cylindrical main body 21 whose axis is the first joint axis J1. A first joint hole 22 is formed on the first joint axis J1 on the end surface of the main body 21 on the drive shaft 10 side. Further, on the valve body 30 side of the main body 21, a second joint shaft portion 24 is provided on the second joint axis J2 eccentric from the first joint shaft line J1. The protrusion 31 of the valve body 30 projects from the plate 33 along the valve axis V to the side opposite to the seal surface 34, and an insertion hole 32 orthogonal to the valve axis V is formed.

The drive shaft portion 12 of the drive shaft 10 is fitted into the first joint hole 22 of the joint 201, and the second joint shaft portion 24 of the joint 201 is fitted into the insertion hole 32 of the valve body 30, whereby the drive shaft 10 is fitted. , Joint 201 and valve body 30 are joined. At this time, the outer diameter of the drive side shaft portion 12 and the inner diameter of the first joint hole 22, and the outer diameter of the second joint shaft portion 24 and the inner diameter of the insertion hole 32 are all set to the gap fitting dimensions. , Fitted so that they can rotate relative to each other.

In a state where the drive shaft 10, the joint 201 and the valve body 30 are connected, the drive axis D, the first joint axis J1 and the second joint axis J2 are arranged in parallel in the Z direction.
In FIG. 3, the first joint axis J1 is eccentric with respect to the drive axis D by δx1 in the X direction, and the second joint axis J2 is eccentric with respect to the first joint axis J1 by δx2 in the X direction. In FIG. 4, the first joint axis J1 is eccentric with respect to the drive axis D by δy1 in the Y direction, and the second joint axis J2 is eccentric with respect to the first joint axis J1 by δy2 in the Y direction.

In the joint of each embodiment, a portion provided on the first joint axis J1 and connected to the drive shaft 10 is referred to as a “first joint portion”. Further, a portion provided on the second joint axis J2 and directly or indirectly connected to the insertion hole 32 of the valve body 30 is referred to as a “second joint portion”. In the joint 201 of the first embodiment, the first joint hole 22 corresponds to the "first joint portion", and the second joint shaft portion 24 corresponds to the "second joint portion".

Further, as shown in FIGS. 2 and 3, the maximum distance Rmax from the drive axis D to the outer wall of the second joint shaft portion 24 of the joint 201 is defined. In the first embodiment, the outer wall of the second joint shaft portion 24 corresponds to the “outer edge of the second joint portion”. With the joint 201 coupled to the drive shaft 10, the maximum distance Rmax is set to be larger than the radius Ra of the drive shaft 10.

When the drive shaft 10 is provided with a drive side shaft portion that is directly connected to the insertion hole 32 of the valve body 30 as in the prior art of Patent Document 1, it is necessary to increase the diameter of the drive shaft 10. From the viewpoint of maintaining the strength of the joint portion, it is not appropriate to reduce the diameter of the shaft portion. Further, from the viewpoint of processing the drive shaft 10, it is not realistic to form an irregular shape that is not a rotating body. Therefore, in order to secure the amount of eccentricity with the valve body 30, there is no choice but to increase the diameter of the drive shaft 10 itself. However, if the diameter of the drive shaft 10 is increased, the physique and weight are increased, and the pressure loss of the fluid flowing through the flow path 42 is increased.

In response to this problem, in the first embodiment, the diameter of the drive shaft 10 is formed by connecting the drive shaft 10 and the valve body 30 via a joint 201 having an eccentric first joint axis J1 and a second joint axis J2. The required amount of eccentricity can be secured without increasing the size. Since it is not necessary to increase the diameter of the drive shaft 10, problems such as an increase in physique, weight, and an increase in pressure loss due to an increase in the diameter of the drive shaft 10 can be appropriately avoided. Further, since the diameter of the shaft portion is not reduced, the strength of the bond is maintained. Further, it is possible to avoid forming the drive shaft 10 into an irregular shape that is difficult to process.

Next, the method of manufacturing the valve device of the first embodiment will be described with reference to FIGS. 5 and 6. As shown in the flowchart of FIG. 5, the method for manufacturing the valve device includes a setting step S1, an X direction adjusting step S2, and a Y direction adjusting step S3.

In the setting step S1, the drive shaft 10 is inserted into the drive shaft insertion hole 95 of the housing 91, and the valve body 30 is fitted to the valve seat in a state where the drive shaft 10, the joint 201, and the valve body 30 are fitted to each other so as to be relatively rotatable. Set against 45. "The valve body 30 is set with respect to the valve seat 45" means that the valve body 30 is temporarily placed on the valve seat 45. At this time, the sealing surface 34 of the valve body 30 may come into contact with the seat surface 47 of the valve seat 45 with high accuracy, and adjustment may not be necessary. On the other hand, the valve body 30 and the valve seat 45 may be misaligned due to an error in the component dimensions or a variation in the assembly work. Therefore, it is required to adjust the position of the valve body 30 for each product.

In the X-direction adjustment step S2, the radial positional deviation between the valve body 30 and the valve seat 45 at the valve closed position is adjusted to be close to zero. Specifically, as shown in FIG. 6A, while rotating the first joint hole 22 of the joint 201 with respect to the drive side shaft portion 12 of the drive shaft 10, the drive shaft 10 and the first joint axis J1 The relative position in the X direction is adjusted within the adjustment range Xadj. After the relative position in the X direction is adjusted, the first joint hole 22 of the joint 201 and the drive side shaft portion 12 of the drive shaft 10 are fixed by welding, for example.

After the X-direction adjusting step S2, in the Y-direction adjusting step S3, the axial misalignment between the valve body 30 and the valve seat 45 at the valve closing position is adjusted to be close to zero. Specifically, as shown in FIG. 6B, while rotating the drive shaft 10 and the joint 201 with respect to the valve body 30, the relative position of the valve body 30 and the drive axis D in the Y direction is within the adjustment range Yadj. Adjust with. At this time, since the drive shaft 10 and the joint 201 are fixed, the amount of movement in the X direction can be minimized even if the drive shaft 10 is rotated. After the relative position in the Y direction is adjusted, the second joint shaft portion 24 of the joint 201 and the insertion hole 32 of the valve body 30 are fixed by welding, for example.

In this manufacturing method, in the X-direction adjusting step S2 and the Y-direction adjusting step S3, the drive shaft 10 and the joint are arranged so that the radial and axial misalignment between the valve body and the valve seat at the valve closing position approaches zero. The relative positions of 201 and the valve body 30 are adjusted and fixed. Therefore, it is possible to suppress the occurrence of leakage due to the gap between the seal surface 34 and the seat surface 47 at the valve closed position.

Next, the second to fourth embodiments relating to the joint and the drive shaft or the joint and the valve body are described with reference to FIGS. 7 to 9 corresponding to FIG. 3 of the first embodiment.

(Second Embodiment)
In the second embodiment shown in FIG. 7, a drive side hole 13 eccentric with respect to the drive axis D is provided at the end of the drive shaft 10 on the joint 202 side. In the joint 202, the first joint shaft portion 23 as the first joint portion is formed on the first joint axis J1. The first joint shaft portion 23 can be fitted into the drive side hole 13 of the drive shaft 10. The configuration of the second joint shaft portion 24 as the second joint portion is the same as that of the first embodiment. In the second embodiment, the same effects as those in the first embodiment can be obtained.

(Third Embodiment)
In the joint 203 of the third embodiment shown in FIG. 8, a second joint hole 25 as a second joint portion is formed on the second joint axis J2. The coupling pin 39 is inserted across the second joint hole 25 and the insertion hole 32 of the valve body 30. That is, the second joint hole 25 is indirectly coupled to the insertion hole 32 of the valve body 30 via the coupling pin 39. The configuration of the first joint shaft portion 23 as the first joint portion is the same as that of the second embodiment. In the third embodiment, the inner wall of the second joint hole 25 corresponds to the "outer edge of the second joint". With the joint 203 connected to the drive shaft 10, the maximum distance Rmax from the drive axis D to the inner wall of the second joint hole 25 is set to be larger than the radius Ra of the drive shaft 10.

The inner diameters of the second joint hole 25 and the insertion hole 32 may be such that one is a gap fit and the other is a tight fit with respect to the outer diameter of the coupling pin 39. For example, when the second joint hole 25 side has a gap fitting dimension and the insertion hole 32 side has a tightening fitting dimension, one end of the coupling pin 39 is first press-fitted into the insertion hole 32 of the valve body 30 to form a sub-assembly, and then from the valve body 30. The protruding coupling pin 39 is fitted into the second joint hole 25 of the joint 203, and the assembly can be adjusted. On the contrary, when one end of the coupling pin 39 is press-fitted first with the second joint hole 25 side as the tightening dimension, the configuration of the second coupling portion is substantially the same as that of the first and second embodiments. In the third embodiment, the same effects as those in the above embodiment can be obtained. Further, a standard product can be used as the coupling pin 39.

(Fourth Embodiment)
The joint 204 of the fourth embodiment shown in FIG. 9 is configured by connecting two sub-joints 2041 and 2042 on the connecting axis JC. In the sub-joint 2041 on the drive shaft 10 side, the first joint hole 22 as the first coupling portion is formed on the first joint axis J1, and the connecting shaft portion 26 is formed on the connecting axis JC. In the sub-joint 2042 on the valve body 30 side, a connecting hole 27 is formed on the connecting axis JC, and a second joint shaft portion 24 as a second connecting portion is formed on the second joint axis J2. The connected joint 204 functions in the same manner as the joint 201 of the first embodiment.

The embodiment of FIG. 9 may be applied to connect three or more sub-joints. In the fourth embodiment, the same effects as those in the above embodiment can be obtained, and by connecting a plurality of sub-joints, a larger amount of eccentricity can be secured without increasing the diameter of each joint. Further, in the method of manufacturing the valve device, the connection between the connecting shaft portion and the connecting hole can be adjusted, so that more delicate adjustment is possible.

(Other embodiments)
The valve device of the present invention and the method for manufacturing the same can be applied not only to EGR valves but also to various on-off valves such as throttle valves, flow rate adjusting valves, pressure adjusting valves and the like.

As described above, the present invention is not limited to the above-described embodiment, and can be implemented in various embodiments without departing from the spirit of the invention.

10 ... Drive shaft,
201-204 ... Joint,
22 ... 1st joint hole (1st joint),
23 ... 1st joint shaft part (1st joint part),
24 ... 2nd joint shaft part (2nd joint part),
25 ... 2nd joint hole (2nd joint),
30 ... valve body, 31 ... protrusion, 32 ... insertion hole,
33 ... Plate part, 34 ... Seal surface,
45 ... valve seat, 46 ... valve hole, 47 ... seat surface,
90 ... Valve device, 91 ... Housing, 95 ... Drive shaft insertion hole.

Claims (4)

A housing (91) having a valve hole (46) constituting the flow path (42) and a valve seat (45) including an annular seat surface (47) formed at the edge of the valve hole.
A plate portion (33) having an annular sealing surface (34) centered on the valve axis (V) corresponding to the seat surface formed on the outer periphery, and the sealing surface from the plate portion along the valve axis. A valve body (30) having a protrusion (31) protruding to the opposite side and having an insertion hole (32) formed orthogonal to the valve axis.
A drive shaft (10) that is inserted into the drive shaft insertion hole (95) formed in the housing and can rotate about a drive shaft (D) extending in parallel with the radial direction of the valve hole.
The valve is provided on the first joint axis (22, 23) provided on the first joint axis (J1) and coupled to the drive shaft, and on the second joint axis (J2) eccentric from the first joint axis. A joint (201-204) having a second coupling portion (24, 25) that directly or indirectly couples with the insertion hole of the body and relays the coupling between the drive shaft and the valve body.
With
The valve body coupled to the drive shaft rotates about the drive shaft line, and has a valve closing position where the sealing surface abuts on the seat surface and a valve opening position where the sealing surface separates from the seat surface. Can rotate between
At the valve closing position of the valve body, the drive axis is eccentric from the valve axis in the X direction, which is orthogonal to the drive axis in the radial direction of the valve body, and the insertion of the valve body. Arranged eccentrically in the Y direction, which is the direction of the valve axis from the hole,
With the joint coupled to the drive shaft, the first joint axis is parallel to the drive axis, and the maximum distance (Rmax) from the drive axis to the outer edge of the second joint of the joint is the drive. A valve device that is set larger than the axis radius (Ra). The drive shaft is provided with a drive side shaft portion (12) eccentric with respect to the drive shaft line at an end portion on the joint (201, 204) side.
The valve device according to claim 1, wherein the joint is formed with a first joint hole (22) into which the drive side shaft portion can be fitted as the first joint portion. The first or second aspect of the present invention, wherein the joint (201, 202, 204) is provided with a second joint shaft portion (24) that can be fitted into the insertion hole of the valve body as the second joint portion. Valve device. A housing (91) having a valve hole (46) constituting the flow path (42) and a valve seat (45) including an annular seat surface (47) formed at the edge of the valve hole.
A plate portion (33) having an annular sealing surface (34) centered on the valve axis (V) corresponding to the seat surface formed on the outer periphery, and the sealing surface from the plate portion along the valve axis. A valve body (30) having a protrusion (31) protruding to the opposite side and having an insertion hole (32) formed orthogonal to the valve axis.
A drive shaft (10) that is inserted into the drive shaft insertion hole (95) formed in the housing and can rotate about a drive shaft (D) extending in parallel with the radial direction of the valve hole.
The valve is provided on the first joint axis (22, 23) provided on the first joint axis (J1) and coupled to the drive shaft, and on the second joint axis (J2) eccentric from the first joint axis. A joint (201-204) having a second coupling portion (24, 25) that directly or indirectly couples with the insertion hole of the body and relays the coupling between the drive shaft and the valve body.
With
The valve body coupled to the drive shaft rotates about the drive shaft line, and has a valve closing position where the sealing surface abuts on the seat surface and a valve opening position where the sealing surface separates from the seat surface. Can rotate between
At the valve closing position of the valve body, the drive axis is eccentric from the valve axis in the X direction, which is orthogonal to the drive axis in the radial direction of the valve body, and the insertion of the valve body. Arranged eccentrically in the Y direction, which is the direction of the valve axis from the hole,
With the joint coupled to the drive shaft, the first joint axis is parallel to the drive axis, and the maximum distance (Rmax) from the drive axis to the outer edge of the second joint of the joint is the drive. It is a method of manufacturing a valve device that is set to be larger than the radius (Ra) of the shaft.
The drive shaft is inserted into the drive shaft insertion hole of the housing, and the valve body is set with respect to the valve seat in a state where the drive shaft, the joint, and the valve body are fitted to each other so as to be relatively rotatable. Setting process (S1) and
The drive shaft and the first joint axis are rotated while the joint is rotated with respect to the drive shaft so that the radial positional deviation between the valve body and the valve seat at the valve closed position approaches zero. The X-direction adjustment step (S2) of adjusting the relative position in the X-direction and fixing the joint and the drive shaft,
After the X-direction adjustment step, while rotating the drive shaft and the joint with respect to the valve body so that the axial misalignment between the valve body and the valve seat at the valve closing position approaches zero. A Y-direction adjustment step (S3) of adjusting the relative positions of the valve body and the drive axis in the Y direction and fixing the joint and the valve body.
A method of manufacturing a valve device including.

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