JP6485241B2 - Valve mounting member fixing method and valve mounting member fixing device - Google Patents

Description

  The present invention relates to a method for fixing a valve mounting member and a fixing device for a valve mounting member.

  Conventionally, a supercharger including a waste gate valve is known. For example, a turbocharger described in Patent Document 1 includes a bush provided so as to penetrate the outer wall of a turbine housing, a stem supported by the bush, a link member connected to one end of the stem, and other stems. A wastegate valve including a valve mounting member connected to the end. In this waste gate valve, an annular spring member for suppressing vibration (abnormal noise) is provided in a gap between the bush and the link member.

JP 2014-218945 A

  In the waste gate valve in Patent Document 1, the stem is rotatably supported with respect to the bush. Accordingly, the valve mounting member is operated by rotating the stem in conjunction with the operation of the link member. The spring member is held between the bush and the link member so that a predetermined load is applied to the spring member (elastic member). The vibration generated in the waste gate valve is suppressed by the spring member.

  However, when the load on the spring member is too large, the frictional force between the link member and the bush increases, which may make it difficult for the stem to rotate. Moreover, when the load with respect to a spring member is too small, there exists a possibility that it becomes impossible to fully suppress a vibration. For this reason, when an elastic member is provided between the link member and the bush, it is important that the load applied to the elastic member does not vary.

  An object of this invention is to provide the fixing method of the valve attachment member which can suppress the variation of the load added to an elastic member, and the fixing device of a valve attachment member.

  One aspect of the present invention is a fixing method for fixing a valve mounting member to one end of a stem supported by a cylindrical bush, and an elastic member is provided between the bush and a link member provided at the other end of the stem. The supporting step of arranging and supporting the stem by the bush, and holding the state in which the link member is relatively pressed toward the bush, and pressing the valve mounting member toward the bush, the valve mounting member at one end of the stem Fixing step.

  In this fixing method, the link member is pressed relative to the bush while the elastic member is disposed between the bush and the link member. Thereby, a load is applied to the elastic member by the bush and the link member. When the valve mounting member is fixed to the stem, the state where the elastic member is pressed is held. The valve mounting member is pressed toward the bush. Accordingly, when the valve mounting member is fixed to the stem, the movement of the stem toward the other end side in the axial direction is restricted. Therefore, the pressing state of the elastic member in the fixing step can be maintained, and variations in the load applied to the elastic member can be suppressed.

  In the fixing step, the link member may be pressed toward the bush so that the pressing state of the link member against the bush is maintained at a constant pressing force. According to this configuration, for example, even if there is structural variation in the elastic member, the link member can be pressed against the bush with a constant pressing force. Thereby, the load applied to the elastic member can be kept constant.

  Moreover, the structure which measures the pressing force which presses a link member in a fixing process may be sufficient. According to this configuration, the load applied to the elastic member can be confirmed by measuring the pressing force that presses the link member.

  Another embodiment of the present invention is a fixing device that fixes a valve mounting member to one end of a stem supported by a cylindrical bush, and is elastic between a bush and a link member provided at the other end of the stem. In a state where the member is arranged, a pressing portion that presses the link member toward the bush, a jig that holds the state where the valve mounting member is pressed toward the bush, and the pressing of the link member against the bush by the pressing portion are held. A welded portion that welds and fixes the valve mounting member to one end of the stem in a state where the pressure is applied, and the pressing portion is freely movable between a standby position spaced from the link member and a stop position that holds the pressed state of the link member It is.

  In this fixing device, the state where the elastic member is pressed is maintained by fixing the pressing portion at the stop position in a state where the elastic member is disposed between the bush and the link member. Thereby, a load is applied to the elastic member by the bush and the link member. The valve mounting member is pressed toward the bush by a jig. In this state, when the valve mounting member is fixed to the stem by the welded portion, the movement of the stem toward the other end side in the axial direction is restricted. Therefore, the pressing state of the elastic member when the pressing portion is at the stop position can be maintained, and variation in the load applied to the elastic member can be suppressed.

  In addition, the apparatus further includes a control unit that controls movement of the pressing unit and welding fixation by the welding unit, and the control unit acquires data of pressing force with which the pressing unit presses the link member, and data acquisition Determining means for determining whether or not the pressing force data acquired by the means is included in the reference range, and the pressing force data is determined by the determining means while moving the pressing portion from the standby position toward the stop position. A movement control means for stopping the movement of the pressing portion when it is determined to be included, and a welding control means for performing welding fixation with the welded portion in a state where the pressing portion is stopped by the movement control means. Good. According to this configuration, the pressing force of the fixed elastic member when the pressing portion is at the stop position can be managed within the reference range. Since welding fixation by a welding part is performed in the state where the press part was stopped at the stop position, variation in the load applied to the elastic member can be suppressed.

  According to the valve mounting member fixing method and the valve mounting member fixing device according to one aspect of the present invention, variation in the load applied to the elastic member can be suppressed.

FIG. 1 is a sectional view showing a supercharger for a vehicle. FIG. 2 is a side view of the vehicle supercharger shown in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a partially enlarged view of FIG. FIGS. 5A and 5B are front views showing the fixing device for the valve mounting member, in which FIG. 5A shows a standby position and FIG. 5B shows a stop position. FIG. 6 is a view for explaining a fixing process of the valve mounting member. FIG. 7 is a configuration diagram showing a valve mounting member fixing device according to another embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

(First embodiment)
A supercharger 1 shown in FIGS. 1 to 3 is a supercharger for a vehicle, and compresses air supplied to an engine using exhaust gas discharged from an engine (not shown). The supercharger 1 includes a turbine 2 and a compressor (centrifugal compressor) 3. The turbine 2 includes a turbine housing 4 and a turbine impeller 6 housed in the turbine housing 4. The compressor 3 includes a compressor housing 5 and a compressor impeller 7 housed in the compressor housing 5.

  The turbine impeller 6 is provided at one end of the rotating shaft 14, and the compressor impeller 7 is provided at the other end of the rotating shaft 14. A bearing housing 13 is provided between the turbine housing 4 and the compressor housing 5. The rotating shaft (rotor shaft) 14 is rotatably supported by the bearing housing 13 via a bearing 15. The supercharger 1 includes a turbine rotor shaft 16, and the turbine rotor shaft 16 includes a rotating shaft 14 and a turbine impeller 6 provided at one end of the rotating shaft 14. The turbine rotor shaft 16 and the compressor impeller 7 rotate as an integral rotating body.

  The turbine housing 4 is provided with an exhaust gas inlet 8 and an exhaust gas outlet 10. Exhaust gas discharged from the engine flows into the turbine scroll passage 4 a through the exhaust gas inlet 8, rotates the turbine impeller 6, and then flows out of the turbine housing 4 through the exhaust gas outlet 10. A plurality of (three in this embodiment) fastening holes 4c for connection to the exhaust manifold of the engine are provided in the mounting flange 4b in which the exhaust gas inlet 8 is formed.

  The compressor housing 5 is provided with a suction port 9 and a discharge port 11. When the turbine impeller 6 rotates as described above, the turbine rotor shaft 16 and the compressor impeller 7 rotate. The rotating compressor wheel 7 compresses the air sucked from the suction port 9. The compressed air passes through the compressor scroll channel 5 a and is discharged from the discharge port 11. The compressed air discharged from the discharge port 11 is supplied to the engine.

  As shown in FIGS. 1 and 3, a part of the exhaust gas introduced from the exhaust gas inlet 8 is led into the turbine housing 4 to the exhaust gas outlet 10 side by bypassing the turbine impeller 6. A bypass passage (see FIG. 3) 17 is formed. The bypass passage 17 is a gas flow rate variable passage for making the flow rate of the exhaust gas supplied to the turbine impeller 6 side variable.

  A waste gate valve 20 is provided inside the turbine housing 4 as one of the variable flow rate valve mechanisms. The waste gate valve 20 is a valve that opens and closes the opening of the bypass passage 17. The waste gate valve 20 is supported by the valve mounting member 22, a stem 21 that is rotatably supported with respect to the outer wall of the turbine housing 4, a valve mounting member 22 that projects from one end side of the stem 21 in the radial direction of the stem 21. The valve body 23 is provided.

  A support hole 24 penetrating in the thickness direction of the outer wall is formed in the outer wall of the turbine housing 4. A cylindrical bush 25 is inserted into the support hole 24. The bush 25 is fixed to the outer wall of the turbine housing 4. As shown in FIG. 4, the bush 25 in the present embodiment includes a small diameter portion 25 a formed on one end side in the axial direction and a large diameter portion 25 b formed on the other end side in the axial direction. The small diameter portion 25 a is inserted into the turbine housing 4. The large diameter part 25 b is formed to have a larger diameter than the small diameter part 25 a and is exposed to the outside of the turbine housing 4. Further, the end face 25c on the other end side in the large diameter portion 25b is formed flat.

  As shown in FIG. 3, the stem 21 is inserted into the bush 25 and supported rotatably with respect to the outer wall of the turbine housing 4. An end (one end) of the stem 21 disposed inside the turbine housing 4 is inserted into a cylindrical portion 22 a formed at the base end of the valve mounting member 22. The valve mounting member 22 is welded and fixed to the stem 21 by a fixing method described later. The stem 21 rotates around the axis of the stem 21 and swings the valve mounting member 22. A mounting hole for mounting the valve body 23 is provided at the tip of the valve mounting member 22.

  The valve body 23 can be brought into contact with and separated from the peripheral edge of the opening of the bypass passage 17 and has, for example, a disk shape. The valve body 23 is provided with a valve shaft 26 that protrudes on the side opposite to the opening of the bypass passage 17. The valve shaft 26 is inserted through the mounting hole at the tip of the valve mounting member 22. A stopper 27 is fixed to the end of the valve shaft 26 opposite to the valve body 23, and the valve shaft 26 inserted through the mounting hole is held by the stopper 27. The valve body 23 is supported so as to be finely movable (including tilting) with respect to the valve mounting member 22. As a result, the valve body 23 slightly moves with respect to the valve mounting member 22, so that the valve body 23 comes into close contact with the peripheral edge of the opening of the bypass passage 17. Then, the valve body 23 comes into contact with the peripheral edge portion of the opening portion of the bypass passage 17 and the waste gate valve 20 is closed. It becomes a state.

  As shown in FIGS. 3 and 4, a plate-like link member 28 protruding in the radial direction of the stem 21 is fixed to an end portion (the other end) of the stem 21 disposed outside the turbine housing 4. Yes. In the present embodiment, the stem 21 passes through a through hole formed at the proximal end of the link member 28. The end surface 21a on the other end side of the stem 21 that penetrates the link member 28 is formed flat.

  An annular disc spring (elastic member) 31 that absorbs vibration of the link member 28 is provided in the gap between the end surface 25c of the large-diameter portion 25b of the bush 25 and the side surface 28a of the link member 28 on the bush 25 side. The disc spring 31 is formed with a bottom surface portion 31a that contacts the end surface 25c of the bush 25, an insertion hole through which the stem 21 is inserted, an upper surface portion 31b that contacts the link member 28, a bottom surface portion 31a, and an upper surface portion 31b. And an inclined portion 31c for connecting the two. The disc spring 31 is sandwiched between the bush 25 and the link member 28 with a predetermined pressing force in a state where the end face 25d of the small diameter portion 25a of the bush 25 and the valve mounting member 22 are in contact with each other. In the present embodiment, the bush 25 is provided with a large-diameter portion 25b so that the disc spring 31 is easily brought into contact. The outer diameter of the bottom surface portion 31a of the disc spring 31 is the outer diameter of the large-diameter portion 25b of the bush 25. It is set as follows.

  As shown in FIGS. 2 and 3, an attachment hole into which the connection pin 29 is inserted is formed at the distal end portion of the link member 28, and the connection pin 29 is inserted into the attachment hole. Further, the connecting pin 29 is inserted through a mounting hole formed in the distal end portion 51 a of the operating rod 51 of the actuator 50. One end of the connecting pin 29 is fixed to the operating rod 51 by caulking. A clip 30 is attached to the other end of the connection pin 29 to prevent the connection pin 29 from falling off the mounting hole. The stem 21 is connected to the operating rod 51 of the actuator 50 via the link member 28 and the connecting pin 29.

  The actuator 50 is fixed to a bracket 18 that protrudes laterally from the compressor housing 5. The actuator 50 includes, for example, an operating rod 51 connected to the valve body, a diaphragm that drives the operating rod 51, a low pressure chamber 59 and a high pressure chamber 58 that are adjacent to each other across the diaphragm in the axial direction of the operating rod 51, and a low pressure. And a return spring disposed in the chamber 59 for urging the diaphragm. In the actuator 50, when the pressure on the outlet side of the compressor 3 reaches the set pressure, the operating rod 51 is moved to the distal end side, and when the pressure on the outlet side of the compressor 3 becomes lower than the set pressure, the operating rod 51 is moved to the proximal end side. Let

  Next, the fixing device 100 according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 5, the fixing device 100 is a device for performing a fixing step of welding and fixing the valve mounting member 22 to one end of the stem 21 supported by the bush 25. The fixing device 100 includes a fixing portion 101, a spring plunger (pressing portion) 110, jigs 120 and 130, and a welding machine (welding portion) 140. The fixing unit 101 is for positioning the supercharger 1 with respect to the fixing device 100. The fixing portion 101 in the present embodiment includes a wall portion 102 to which the supercharger 1 is fixed at a predetermined position P. A protrusion 102 a corresponding to the fastening hole 4 c of the mounting flange 4 b in the turbine housing 4 is formed on the wall portion 102. The supercharger 1 is positioned by inserting the projection 102a into the fastening hole 4c of the mounting flange 4b. In the positioned state, the mounting flange 4 b of the turbine housing 4 is in contact with the wall portion 102. In the fixing portion 101, the mounting flange 4 b is fixed to the wall portion 102 while maintaining the state in which the mounting flange 4 b is in contact with the wall portion 102.

  The spring plunger 110 relatively presses the link member 28 toward the bush 25. The spring plunger 110 has a bottomed cylindrical portion 111 with a spring disposed inside, one end abutting the spring inside the bottomed cylindrical portion 111, and the other end exposed to the outside of the bottomed cylindrical portion 111. And a rod-like portion 112. In such a spring plunger 110, the rod-like portion 112 moves to the inside of the bottomed cylindrical portion 111 against the biasing force of the spring by being pressed inside the bottomed cylindrical portion 111. The moving distance of the rod-shaped portion 112 at this time is substantially proportional to the load that presses the rod-shaped portion 112.

  The spring plunger 110 is mounted on the moving unit 115. The moving portion 115 allows the spring plunger 110 to move between a standby position (see FIG. 5A) and a stop position (see FIG. 5B). When the spring plunger 110 is in the standby position, the rod-like portion 112 of the spring plunger 110 is in a position separated from the stem 21. Further, when the spring plunger 110 is at the stop position, the stem 21 is pressed by the rod-like portion 112 of the spring plunger 110. Thereby, the link member 28 fixed to the stem 21 is also pressed. As indicated by an arrow A in FIG. 6, the spring plunger 110 presses the end surface 21 a of the stem 21 along the axial direction so that the disc spring 31 is sandwiched between the end surface of the bush 25 and the link member 28.

  In this embodiment, the stop position of the spring plunger 110 is a preset position. Further, since the supercharger 1 is fixed at the predetermined position P of the fixing portion 101, the position of the end surface 21a of the stem 21 supported by the bush 25 is constant. Thereby, the moving distance of the rod-shaped part 112 when the spring plunger 110 is pressing the stem 21 becomes constant. Therefore, when the spring plunger 110 is moved to the stop position, the load applied to the link member 28 (that is, the load applied to the disc spring 31) is constant. It should be noted that the load at this time is designed to be in a range where the rotation of the stem 21 is not difficult, and in a range in which vibration by the disc spring 31 can be sufficiently suppressed. Thus, by holding the position of the spring plunger 110 at the stop position, it is possible to hold the state where the link member 28 is pressed. Note that “constant” includes not only the case where it is strictly constant but also the case where a predetermined error is allowed. Here, the spring constant of the spring disposed on the spring plunger 110 is set small so that the load applied to the link member 28 falls within an error within a predetermined range. Thereby, for example, even when a position error of the end surface 21a of the stem 21 occurs, it is possible to suppress the influence of the load applied to the link member 28 on the variation.

  The jig 120 presses the valve mounting member 22 toward the bush 25. The jig 130 presses the valve mounting member 22 toward the opening of the bypass passage 17. Each of these jigs 120 and 130 has a bottomed cylindrical portion 121 and 131 in which a spring is disposed on the inside, one end abutting on the spring inside the bottomed cylindrical portion 121 and 131, and the other end on the other end. Contact portions 122 and 132 exposed to the outside of the bottomed cylindrical portions 121 and 131.

  The jigs 120 and 130 are fixed to the moving parts 125 and 135, respectively. The moving parts 125 and 135 are separated from the valve mounting member 22 at the separated positions (see FIG. 5A), and the contact parts 122 and 132 are in contact with the valve mounting member 22. The jigs 120 and 130 are moved to the position (see FIG. 5B). When the jigs 120 and 130 move from the separated position to the contact position, the valve mounting member 22 is pressed by the contact parts 122 and 132. As indicated by an arrow B in FIG. 6, the jig 120 presses the valve mounting member 22 toward the bush 25 along the axial direction of the stem 21. Thereby, the end surface 25d of the bush 25 and the valve mounting member 22 are brought into contact with each other. Further, as indicated by the symbol C, the jig 130 presses the valve mounting member 22 toward the bypass passage 17. As a result, the valve body 23 comes into close contact with the peripheral edge of the opening of the bypass passage 17.

  The welder 140 welds and fixes the valve mounting member 22 to one end of the stem 21. As shown in FIG. 5, the welding machine 140 includes a manipulator 141 and a welding torch 142 provided at the tip of the manipulator 141. In the present embodiment, a hole 22b that penetrates to the stem 21 is formed on the side surface of the valve mounting member 22 (see FIG. 6). The welding machine 140 performs welding and fixing of the stem 21 and the valve mounting member 22 through the hole 22b. This welding fixation is executed in a state where the pressure of the stem 21 and the valve mounting member 22 by the spring plunger 110 and the jigs 120 and 130 is held.

  Next, a fixing method for fixing the valve mounting member 22 to the stem 21 by welding using the fixing device 100 will be described.

  The fixing method in this embodiment includes a supporting step and a fixing step. In the supporting step, the stem 21 to which the link member 28 is fixed by welding in advance is supported by the bush 25 (see FIG. 6). At this time, the stem 21 is inserted through the insertion hole of the disc spring 31 so that the disc spring 31 is disposed between the bush 25 and the link member 28. Inside the turbine housing 4, the end portion of the stem 21 is inserted into the tubular portion 22 a of the valve mounting member 22. Further, the operating rod is located on the proximal end side. And the some protrusion 102a of the wall part 102 in the fixing | fixed part 101 is penetrated by the some fastening hole 4c of the attachment flange 4b. In this state, the mounting flange 4b is fixed to the wall portion 102 of the fixing portion 101, whereby the supercharger 1 is fixed at the position P. In this state, since the disc spring 31 is pressed from the bush 25 and the link member 28, no load is applied to the disc spring 31.

  Subsequently, in the fixing step, the valve mounting member 22 is fixed to one end of the stem 21. In the present embodiment, first, the jigs 120 and 130 are moved from the separated position to the contact position by the moving portions 125 and 135 (see FIG. 5B). As a result, the end face 25 d of the bush 25 and the valve mounting member 22 come into contact with each other, and the valve body 23 comes into close contact with the peripheral edge of the opening of the bypass passage 17. Then, the spring plunger 110 is moved from the standby position to the stop position by the moving unit 115. As a result, the disc spring 31 is held between the end face 25 c of the bush 25 and the link member 28. At this time, the load applied to the link member 28 is kept constant. In this state, the valve mounting member 22 is welded and fixed to one end of the stem 21 by the welder 140.

  In the fixing method using the fixing device 100 described above, the link member 28 is pressed against the bush 25 while the disc spring 31 is disposed between the bush 25 and the link member 28. As a result, a load is applied to the disc spring 31 by the bush 25 and the link member 28. When the valve mounting member 22 is fixed to the stem 21, the spring plunger 110 is stopped at the stop position, and the state where the disc spring 31 is pressed is held. Further, the valve mounting member 22 is pressed toward the bush 25. Thereby, when the valve mounting member 22 is fixed to the stem 21, the movement of the stem 21 toward the other end side in the axial direction is restricted. Therefore, the pressed state of the disc spring 31 in the fixing step can be maintained, and variations in the load applied to the disc spring 31 can be suppressed.

  In the fixing step, the spring plunger 110 presses the link member 28 toward the bush 25. Thereby, the pressing state of the link member 28 against the bush 25 is maintained at a constant pressing force. For example, the disc spring 31 may have structural variations due to quality differences in the production process. However, the load applied to the disc spring 31 can be kept constant by pressing the link member 28 against the bush 25 with a constant pressing force.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The fixing device 200 according to the present embodiment is different from the fixing device 100 according to the first embodiment in that the load cell 210 is used instead of the spring plunger 110 and the control unit 220 controls the load cell 210 and the welding machine 140. Yes. Hereinafter, points different from the first embodiment will be mainly described, and the same elements and members will be denoted by the same reference numerals and detailed description thereof will be omitted.

  The fixing device 200 includes a fixing unit 101, a load cell (pressing unit) 210, jigs 120 and 130, a welding machine 140, and a control unit 220. The jigs 120 and 130 are mounted on the moving parts 125 and 135. Similarly to the spring plunger 110, the load cell 210 presses the end surface 21 a of the stem 21 toward the bush 25. When the stem 21 is pressed, the link member 28 fixed to the stem 21 is also pressed. The load cell 210 includes a contact portion 212 and converts a load applied to the contact portion 212 into an electrical signal. That is, when the stem 21 is pressed by the load cell 210, the load pressing the stem 21 by the electric signal from the load cell 210 (that is, the load applied to the disc spring 31) can be measured. The load cell 210 is mounted on the moving unit 215. The moving unit 215 moves the load cell 210 to a standby position and a stop position, and is controlled by the control unit 220.

  The control unit 220 can be configured by a computer including an arithmetic device such as a CPU and a storage device such as a ROM and a RAM. The control unit 220 is connected to the load cell 210, the moving unit 215, and the welding machine 140 via a communication line, and includes a data acquisition unit 221, a determination unit 222, a movement control unit 223, and a welding control unit 224. The data acquisition unit 221, the determination unit 222, the movement control unit 223, and the welding control unit 224 are configured by, for example, an operation program stored in a storage device and can be executed by the CPU.

  The data acquisition unit 221 acquires an electrical signal output from the load cell 210 as pressing force data at least when the load cell 210 is moved by the moving unit 215. Note that a specific signal that is not recognized as pressing force data may be output from the load cell 210 until the contact portion 212 of the load cell 210 contacts the stem 21.

  The determination unit 222 determines whether the pressing force data acquired by the data acquisition unit 221 is included in the reference range. In the present embodiment, the reference range is set so that the load obtained from the data of the pressing force is in a range in which the rotation of the stem 21 is not difficult and vibration can be sufficiently suppressed by the disc spring 31. Is set.

  The movement control means 223 controls the moving unit 215 for moving the load cell 210 from the standby position to the stop position. In this embodiment, the movement control means 223 moves the load cell 210 from the standby position to the stop position at a constant speed. For example, the movement control means 223 decreases the speed after the contact portion 212 contacts the stem 21. May be. After the abutting portion 212 abuts on the stem 21, if the determining means 222 determines that the pressing force data is included in the reference range, the movement control means 223 stops the movement of the load cell 210 by the moving portion 215.

  When it is determined that the movement of the load cell 210 by the movement control unit 223 is stopped at the stop position, the welding control unit 224 executes the welding fixing of the valve mounting member 22 by the welding machine 140. While welding by the welder 140 is being performed, the movement control unit 223 holds the state where the load cell 210 is stopped at the stop position.

  The fixing method using the fixing device 200 includes a support process and a fixing process. The support process is the same as in the first embodiment. In the subsequent fixing step, the valve mounting member 22 is fixed to one end of the stem 21. In the present embodiment, first, the jigs 120 and 130 are moved from the separated position to the contact position by the moving parts 125 and 135. As a result, the end face 25 d of the bush 25 and the valve mounting member 22 come into contact with each other, and the valve body 23 comes into close contact with the peripheral edge of the opening of the bypass passage 17. Then, the load cell 210 is moved from the standby position to the stop position by the moving unit 215. As a result, the disc spring 31 is held between the end face 25 c of the bush 25 and the link member 28. At this time, the load applied to the link member 28 is kept constant within the reference range. In this state, the valve mounting member 22 is welded and fixed to one end of the stem 21 by the welder 140.

  In the fixing method using the fixing device 200 described above, the load applied to the disc spring 31 can be confirmed by measuring the pressing force pressing the stem 21 (link member 28). Thereby, the pressing force of the disc spring 31 when the load cell 210 is at the stop position can be managed within the reference range. Since welding fixation by the welding machine 140 is performed in a state where the load cell 210 is stopped at the stop position, variation in the load applied to the disc spring 31 can be suppressed.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, a specific structure is not restricted to this embodiment. For example, although the disc spring 31 is illustrated as an elastic member, it is not limited to this. The elastic member only needs to have an urging force that is within a range in which the rotation of the stem 21 is not difficult and that can sufficiently suppress vibration by the disc spring 31. For example, the elastic member may be another spring such as a coil spring, or may be an elastic resin body having a predetermined heat resistance.

  Moreover, although the example which presses the link member 28 fixed to the stem 21 to the bush 25 by pressing the stem 21 was shown, it is not limited to this. For example, the structure which presses the link member 28 directly by a press part may be sufficient.

  Moreover, in 1st Embodiment, although the spring plunger 110 was illustrated as a press part which presses the link member 28, it is not limited to this. The press part in 1st Embodiment should just have a fixed relationship with respect to the load with respect to the load with respect to the link member 28, for example, a leaf | plate spring etc. may be sufficient as it.

  Moreover, although the example which the movement to the bush 25 side of the valve attachment member 22 is controlled when the valve attachment member 22 contact | abuts to the bush 25 was shown, it is not limited to this. For example, a predetermined member may be interposed between the valve mounting member 22 and the bush 25.

  The jig 120 that presses the valve mounting member 22 toward the bush 25 or the jig 130 that presses the valve mounting member 22 toward the opening of the bypass passage 17 is not limited to the above-described form. For example, the jigs 120 and 130 may be known toggle clamps or the like.

  Moreover, in 2nd Embodiment, although the example which stops the load cell 210 according to the result of the determination means 222 was shown, it is not limited to this. For example, a preset position as in the first embodiment may be set as the stop position. In this case, it can be confirmed by the load cell 210 whether the pressing force is within the reference range.

  Moreover, you may measure the pressing force which presses the stem 21 (link member 28) again after the valve attachment member 22 is fixed by welding. For example, even when a position error of the end surface 21a of the stem 21 occurs due to heat input while the valve mounting member 22 is being welded, it is possible to confirm whether the pressing force is within the reference range by the load cell 210. it can.

DESCRIPTION OF SYMBOLS 1 Supercharger 25 Bush 21 Stem 22 Valve attachment member 31 Disc spring (elastic member)
100,200 Fixing device 110 Spring plunger (pressing part)
120, 130 Jig 140 Welding machine (welded part)
210 Load cell (pressing part)
220 Control Unit 221 Data Acquisition Unit 222 Determination Unit 223 Movement Control Unit 224 Welding Control Unit

Claims (5)

A fixing method for fixing a valve mounting member to one end of a stem supported by a cylindrical bush,
A supporting step of disposing an elastic member between the bush and a link member provided at the other end of the stem and supporting the stem by the bush;
A fixing step of holding the state in which the link member is relatively pressed toward the bush and pressing the valve mounting member toward the bush to fix the valve mounting member to one end of the stem; A method for fixing a valve mounting member.   The method of fixing a valve mounting member according to claim 1, wherein, in the fixing step, the link member is pressed toward the bush so that a pressing state of the link member against the bush is maintained at a constant pressing force.   The method for fixing a valve mounting member according to claim 2, wherein in the fixing step, a pressing force for pressing the link member is measured. A fixing device for fixing a valve mounting member to one end of a stem supported by a cylindrical bush,
A pressing portion that presses the link member toward the bush in a state where an elastic member is disposed between the bush and the link member provided at the other end of the stem;
A jig for holding the valve mounting member pressed against the bush;
A welding portion that welds and fixes the valve mounting member to one end of the stem in a state in which the pressing of the link member against the bush by the pressing portion is held;
The fixing device for the valve mounting member, wherein the pressing portion is movable between a standby position separated from the link member and a stop position that holds the pressed state of the link member. A control unit for controlling the movement of the pressing unit and the welding fixing by the welding unit;
The controller is
Data acquisition means for acquiring data of pressing force with which the pressing portion presses the link member;
Determining means for determining whether or not the data of the pressing force acquired by the data acquiring means is included in a reference range;
A movement control means for stopping the movement of the pressing portion when the determination means determines that the data of the pressing force is included in a reference range while moving the pressing portion from the standby position toward the stop position. When,
The valve mounting member fixing device according to claim 4, further comprising welding control means for performing welding fixation by the welded portion in a state where the pressing portion is stopped by the movement control means.

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