JP2012140894A - Method for manufacturing drive ring, drive ring, and variable nozzle mechanism using the drive ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a drive ring that can improve abrasion resistance and durable reliability.SOLUTION: The method includes: an annular molding step of annularly molding a workpiece W10 to be processed that is a drive ring 10 in a manufacturing stage; an outer peripheral molding step of molding a bridge 11 and an inner periphery 12 of the drive ring 10 by carrying out plastic processing for bending one end of the bridge W11 and the inner periphery W12 of the workpiece W10 to be processed toward the other end of the bridge W11 and the inner periphery W12; and a fitting part processing step of applying plastic processing to arm grooves W13 to W13 and a drive link groove W14 of the workpiece W10 to be processed.

Description

  The present invention relates to a drive ring manufacturing method for operating a predetermined member in synchronization, a drive ring, and a variable nozzle mechanism using the drive ring.

  Conventionally, there has been known a drive ring in which a plurality of fitting portions are formed, and the predetermined members are operated in synchronization by rotating in a state in which the predetermined members are fitted to the respective fitting portions. Yes.

An example of such a drive ring is an adjustment ring (drive ring) disclosed in Patent Document 1. The drive ring disclosed in Patent Document 1 has a plurality of engaging recesses (fitting portions) formed on the inner peripheral portion thereof. The heads of a plurality of blade levers engage with each engaging recess. In addition, a blade shaft connected to a guide blade (VN vane) is attached to the blade lever.
When such a drive ring is rotated, each blade lever and each guide blade rotate in synchronization.

Such a drive ring is generally manufactured by punching a substantially plate-shaped metal member along the shape of the drive ring.
However, in the drive ring manufactured in this way, the degree of wear of the engaging recess that engages with the head of the blade lever is relatively large, and the fatigue strength of the drive ring cannot be improved. For this reason, it has been difficult to achieve further miniaturization and weight reduction by further improving the accuracy of guide blade control and reducing the plate thickness.

Special table 2009-526939

  The present invention has been made in view of the above circumstances, and provides a drive ring manufacturing method capable of improving wear resistance and durability reliability, a drive ring, and a variable nozzle mechanism using the drive ring. is there.

  In claim 1, an outer peripheral part formed in an annular shape, an inner peripheral part extending radially inward along the shape of the outer peripheral part from one end side in the axial direction of the outer peripheral part, and the inner peripheral part A plurality of fitting parts having a shape that is recessed from a part to a part of the outer peripheral part, and is fitted to a predetermined member at each of the fitting parts, and the predetermined member is operated in synchronization with each other. A method for manufacturing a ring, the ring forming step for forming the workpiece, which is the drive ring in the manufacturing stage, in an annular shape, the portion corresponding to the outer peripheral portion of the workpiece, and the inner peripheral portion An outer peripheral portion that performs plastic working to bend one of the portions corresponding to the outer peripheral portion and the other of the portion corresponding to the inner peripheral portion, and forms the outer peripheral portion and the inner peripheral portion of the drive ring. Corresponding to the molding step and the fitting portion of the workpiece. Performing a fitting portion processing step, the performing plastic working part is intended.

  In claim 2, the annular molding step is based on the dimension along the axial direction of the outer peripheral portion of the drive ring and the dimension along the radial direction of the inner peripheral portion of the plate-like workpiece, This is done by punching in an annular shape.

  According to a third aspect of the present invention, the fitting portion processing step is performed by bending the workpiece into an annular shape so that both end portions of the workpiece contact each other.

  In Claim 4, the outer peripheral part formed in an annular | circular shape, the inner peripheral part extended in the radial inside along the shape of the said outer peripheral part from the one end side in the axial direction of the said outer peripheral part, The said inner peripheral part A plurality of fitting parts having a shape that is recessed from a part to a part of the outer peripheral part, and is fitted to a predetermined member at each of the fitting parts, and the predetermined member is operated in synchronization with each other. The drive ring is formed into an annular shape by forming the workpiece, which is the drive ring at the manufacturing stage, into an annular shape, and the outer peripheral portion and the inner peripheral portion are formed on the workpiece. Performing plastic working to bend one of a portion corresponding to the outer peripheral portion and a portion corresponding to the inner peripheral portion with respect to the other of the portion corresponding to the outer peripheral portion and the portion corresponding to the inner peripheral portion. Corresponding to the fitting part of the workpiece. In part, the plastic working is performed, is intended.

  According to a fifth aspect of the present invention, the drive ring is formed by punching a plate-shaped workpiece based on a dimension along the axial direction of the outer peripheral portion of the drive ring and a dimension along the radial direction of the inner peripheral portion. It is formed into an annular shape.

  According to a sixth aspect of the present invention, as the plastic processing performed on the portion corresponding to the fitting portion, the workpiece is bent into an annular shape so that both end portions of the workpiece are in contact with each other.

  In Claim 7, It is a variable nozzle mechanism using the drive ring as described in any one of Claim 1- Claim 6, Comprising: One end part is fitted by the said fitting part, A vane arm that pivots around the other end by pivoting and a shaft that is rotatably supported on the other end of the vane arm are formed, and the shaft is pivoted around by the rotation of the drive ring. A rotating VN vane, and a driving link having one end fitted to the fitting portion and rotating the driving ring by turning the other end, and the vane arm and one end of the driving link Is fitted to the outer peripheral portion side of the fitting portion.

  According to the present invention, when the drive ring is molded, the fitting portion can be work-hardened and a residual compressive stress can be applied to the drive ring, so that the wear resistance and the durability reliability can be improved.

The perspective view of a drive ring. The A direction arrow directional view in FIG. Explanatory drawing which shows the manufacturing method of a drive ring. Sectional drawing of a workpiece. The figure which shows the modification which shape | molds the outer peripheral part and inner peripheral part of a drive ring. (A) Explanatory drawing which bends an inner peripheral part. (B) Sectional drawing of a workpiece. The perspective view which shows the VN mechanism using a drive ring. The figure which shows the fitting part of a drive ring and a vane arm. Explanatory drawing which shows the manufacturing method of the drive ring of another embodiment. Explanatory drawing which shows the positional relationship of a welding part and a drive link.

Below, the manufacturing method of the drive ring 10 is demonstrated with reference to drawings.
For convenience of explanation, the drive ring 10 of the present embodiment is used for a variable nozzle mechanism (VN (Variable Nozzle) mechanism, hereinafter referred to as “VN mechanism”) provided in the turbocharger (see FIG. 6). .

First, the drive ring 10 will be described.
The drive ring 10 operates predetermined members in synchronization. As shown in FIG. 1, a bridge portion 11, an inner peripheral portion 12, a plurality of arm grooves 13, 13... And a drive link groove 14 are formed in the drive ring 10.

  The bridge portion 11 is an outer peripheral portion of the drive ring 10 and is formed in a continuous annular shape.

  The inner peripheral portion 12 extends from the one end side of the bridge portion 11 in the axial direction of the drive ring 10 to the inner side in the radial direction of the drive ring 10 along the shape of the bridge portion 11.

Therefore, when the drive ring 10 is viewed from the direction along the axial direction of the drive ring 10, the bridge portion 11 is located on the radially outer side of the drive ring 10, and the inner peripheral portion 12 is located on the radially inner side of the drive ring 10. It becomes a substantially annular shape.
Further, when the drive ring 10 is viewed from the direction along the radial direction of the drive ring 10, the bridge portion 11 is located on one end side in the axial direction of the drive ring 10, and the inner peripheral portion on the other end side in the axial direction of the drive ring 10. It becomes a substantially rectangular shape such that 12 is located.

  That is, the cross-sectional shape along the axial direction of the drive ring 10 is substantially L-shaped (stepped shape) that is substantially perpendicular to the bridge portion 11 and the inner peripheral portion 12 (see FIG. 4).

As shown in FIGS. 1 and 2, each arm groove 13, 13... Fits a predetermined member to the drive ring 10. Each arm groove 13, 13... Is recessed from the radially inner end of the inner peripheral portion 12 to the radially outer end, and further recessed toward the bridge portion 11.
In other words, each arm groove 13, 13... Is recessed from the inner peripheral portion 12 to a part of the bridge portion 11.

  That is, the drive ring 10 is open in the radial direction on the side where the inner peripheral portion 12 is formed in the axial direction. Further, in the portion where the arm grooves 13 are formed, the length of the bridge portion 11 in the axial direction is shortened (see symbols L1 and L2 shown in FIG. 2).

  By forming the arm grooves 13 in this way, the bridge portion 11 does not interfere when fitted to a predetermined member at the radially outer end of the drive ring 10. Accordingly, each arm groove 13, 13... Is configured to be able to be fitted to a predetermined member at the radially outer end of the drive ring 10.

  As shown in FIG. 1, the arm grooves 13, 13... Are formed in the drive ring 10 with their phases shifted at equal intervals around the axis of the drive ring 10. The arm grooves 13, 13... Of the present embodiment are formed at ten locations with phases shifted by 36 degrees.

  The drive link groove 14 is fitted with a member for operating the drive ring 10, and serves as a rotation fulcrum of the drive ring 10. The drive link groove 14 is disposed between the adjacent arm groove 13 and the arm groove 13, and is formed in substantially the same shape as the arm groove 13.

  That is, the drive ring 10 has a substantially L-shaped cross section along the axial direction except for the portion where the grooves 13 and 14 are formed.

The drive ring 10 configured in this manner is rotated by receiving a drive torque from a member fitted to the drive link groove 14 by fitting a predetermined member in each of the grooves 13 and 14.
That is, each groove | channel 13 * 14 functions as a some fitting part fitted to a predetermined member in order to operate a predetermined member synchronizing.

Next, a method for manufacturing the drive ring 10 for manufacturing the drive ring 10 will be described. In the manufacturing method of the drive ring 10 of this embodiment, the drive ring 10 is manufactured by processing a thin substantially plate-shaped metal member.
Hereinafter, for convenience of explanation, the drive ring 10 in the manufacturing stage, that is, the substantially plate-like metal member or the metal member in the middle of manufacture will be referred to as “workpiece W10”.

First, in the manufacturing method of the drive ring 10, as shown in FIG. 3, a substantially plate-like workpiece W10 rolled to a predetermined thickness is punched into a substantially annular shape with a predetermined punching machine or the like (FIG. 3). Reference S11).
Such a substantially plate-shaped workpiece W <b> 10 is configured by a metal member whose length in the longitudinal direction and in the short-side direction is larger than the outer diameter dimension of the drive ring 10.

  In addition, the workpiece W10 does not necessarily need to use the rolled metal member, For example, you may use the substantially plate-shaped metal member etc. which were shape | molded by sintering.

Thereby, the workpiece W10 is formed into a substantially annular shape. The workpiece W10 at this time has a substantially annular shape with a flat surface along the radial direction.
Accordingly, when the workpiece W10 is viewed from the outside in the radial direction, a portion corresponding to the bridge portion 11 of the drive ring 10 and a portion corresponding to the inner peripheral portion 12 (hereinafter referred to as “the bridge portion W11 and the inner portion of the workpiece W10”). The shape is a substantially rectangular shape in which the peripheral portion W12 "is overlapped.
That is, the workpiece W10 is in a state where only the bridge portion W11 is visible, and the cross-sectional shape along the axial direction is substantially rectangular (see the workpiece W10 at the time of reference S12 shown in FIG. 3).
In this example, the workpiece W10 in this state is formed such that the dimension from the inner peripheral edge to the outer peripheral edge in the radial direction is larger than the thickness dimension.

  As described above, in the method of manufacturing the drive ring 10, plastic working is performed so as to punch the substantially plate-shaped workpiece W <b> 10. Thereby, the whole workpiece W10 is work-hardened.

  After punching out the workpiece W10, the bridge portion W11 of the workpiece W10 formed in a substantially annular shape is bent with respect to the inner peripheral portion W12 by a predetermined bending machine or the like, so that the bridge portion W11 It shape | molds so that it may become substantially perpendicular | vertical with respect to the part W12 (refer code | symbol S12 shown in FIG. 3). That is, plastic work is performed on the workpiece W10 formed in a substantially annular shape, and the bridge portion 11 and the inner peripheral portion 12 of the drive ring 10 are formed.

By performing such plastic working, the bridge portion W11 of the bent workpiece W10, that is, the bridge portion 11 of the drive ring 10 is further work-hardened (see the work-hardening portion W16 shown in FIG. 3).
Further, the radially outer end portion of the inner peripheral portion W12 of the workpiece W10, that is, the radially outer end portion of the inner peripheral portion 12 of the drive ring 10 is further processed and hardened (the work hardening shown in FIG. 3). (Refer site | part W15 * W16).

  Further, as shown in FIG. 4, by compressing the bridge portion W11 of the workpiece W10, compressive residual stress is applied to the bent portion of the workpiece W10 (the compressive residual stress generation site W17 shown in FIG. 4). (See (17)).

  The fatigue strength of the drive ring 10 is improved by the work hardening of the bridge portion 11 and the inner peripheral portion 12 and the application of compressive residual stress to the drive ring 10. Therefore, the durability reliability of the drive ring 10 can be improved.

  .. Are not formed in the workpiece W10 at this time. Therefore, the cross-sectional shape along the axial direction of the workpiece W10 is substantially L-shaped at any position.

In addition, as shown to Fig.5 (a), you may bend | fold the inner peripheral part W12 of the to-be-processed object W10 shape | molded by the substantially annular | circular shape with respect to the bridge | bridging part W11. In this case, as shown in FIG.5 (b), the inner peripheral part 12 of the drive ring 10 and the edge part by the side of the inner peripheral part 12 of the bridge part 11 are further work-hardened rather than another part (FIG.5 ( (See the work-hardened sites W15 (15) and W16 (16) shown in b)). Further, compressive residual stress is applied to the bridge portion 11 and the inner peripheral portion 12.
In this case, the workpiece W10 before being bent is formed such that the thickness dimension is larger than the dimension from the inner peripheral edge to the outer peripheral edge in the radial direction.

  That is, either the bridge part W11 or the inner peripheral part W12 of the workpiece W10 may be bent.

Thus, in the manufacturing method of the drive ring 10, either one of the bridge portion W11 and the inner peripheral portion W12 of the workpiece W10 is bent with respect to the other of the bridge portion W11 and the inner peripheral portion W12 of the workpiece W10. An outer peripheral portion forming step is performed in which plastic working is performed to form the bridge portion 11 and the inner peripheral portion 12 of the drive ring 10.
Further, the bridge portion 11 and the inner peripheral portion 12 bend one of the bridge portion W11 and the inner peripheral portion W12 of the workpiece W10 with respect to the other of the bridge portion W11 and the inner peripheral portion W12 of the workpiece W10. Molded by plastic working.

  Further, as shown in FIG. 3, the radial dimension of the bridge portion W11 of the workpiece W10 when formed into a substantially annular shape corresponds to the axial dimension of the bridge portion 11 of the drive ring 10 ( (Refer to workpiece W10 at the time of reference numerals S12 and S13 shown in FIG. 3).

As described above, in the method for manufacturing the drive ring 10, an annular forming step for forming the workpiece W10 into an annular shape is performed. In the annular forming step, the plate-like workpiece W10 is punched into an annular shape based on the dimension along the axial direction of the bridge portion 11 of the drive ring 10 and the dimension along the radial direction of the inner peripheral portion 12. Done in
Further, the drive ring 10 has an annular shape by punching a plate-like workpiece W10 based on the dimension along the axial direction of the bridge portion 11 of the drive ring 10 and the dimension along the radial direction of the inner peripheral portion 12. To be molded.

After the substantially ring-shaped workpiece W10 is bent, a part of the inner peripheral portion W12 of the workpiece W10 is punched by a predetermined punching machine or the like (see reference numeral S13 shown in FIG. 3).
As a result, portions corresponding to the arm grooves 13, 13... And the drive link grooves 14 on the inner peripheral portion W12 of the workpiece W10 (hereinafter referred to as “the arm grooves W13, W13. (Referred to as S14 shown in FIG. 3).

Here, as described above, when the substantially plate-shaped workpiece W10 is punched out, the entire workpiece W10 is work-hardened (see S11 shown in FIG. 3). Accordingly, each of the grooves W13 and W14 of the workpiece W10 is plastically processed and work-hardened when the substantially plate-shaped workpiece W10 is punched out.
Further, as described above, when the substantially annular workpiece W10 is bent, the radially outer end of the inner peripheral portion W12 is further work-hardened.

As described above, the step of punching the workpiece W10 to form the substantially annular workpiece W10 functions as a fitting portion machining step for performing plastic working on the grooves W13 and W14 of the workpiece W10.
Further, plastic working is performed on each of the grooves 13 and 14 of the workpiece W10 by punching the workpiece W10 to form a substantially annular workpiece W10.

  According to this, each groove | channel 13 * 14 can be work-hardened entirely, and the edge part of the radial direction outer side can further be work-hardened (refer work hardening part W15 * W16 shown in FIG. 3).

By such work hardening of the grooves 13 and 14, the wear of the grooves 13 and 14 when other members are fitted into the grooves 13 and 14 can be reduced. That is, the wear resistance of the drive ring 10 can be improved.
In particular, the wear resistance of the drive ring 10 can be further improved at the radially outer ends of the grooves 13 and 14, which are parts that are further work-hardened when the workpiece W10 is bent.

  As described above, the length of the bridge portion 11 in the axial direction is shorter in the portion where the grooves 13 and 14 are formed than in the portion where the grooves 13 and 14 are not formed (see FIG. 2). (See reference numerals L1 and L2). Such a portion where the length in the axial direction is shortened is a portion where the fatigue strength in the bridge portion 11 is reduced.

In the manufacturing method of the drive ring 10, the fatigue strength of the drive ring 10 is improved by applying work hardening and compressive residual stress as described above.
In other words, in the method of manufacturing the drive ring 10, such a work hardening and residual compression are applied to the reduction in the partial fatigue strength of the bridge portion 11 that occurs when the grooves 13 and 14 are recessed to a part of the bridge portion 11. Suppressed by stress.

  According to this, each groove | channel 13 * 14 can be dented to a part of bridge part 11, without the fatigue strength of the bridge part 11 falling partially. Therefore, it is possible to manufacture the drive ring 10 in which a predetermined member can be fitted to the radially outer ends of the grooves 13 and 14 in a state in which the fatigue strength of the bridge portion 11 is sufficiently ensured.

In the present embodiment, each of the grooves W13 and W14 of the workpiece W10 is work-hardened by punching the substantially plate-shaped workpiece W10 into a substantially annular shape. In such a case, the grooves W13 and W14 may be formed by cutting the substantially annular workpiece W10.
That is, the grooves W13 and W14 of the workpiece W10 may be plastically processed at least once, and the side surfaces thereof may be work-hardened.

If the substantially plate-shaped workpiece W10 is cut and formed into a substantially annular shape, the grooves W13 and W14 of the workpiece W10 may be punched out and formed. In such a case, the step of forming the grooves W13 and W14 functions as a fitting portion processing step.
However, from the viewpoint that the workpiece W10 can be work-hardened in a wider range, it is preferable to punch the plate-like workpiece W10 into a substantially annular shape.

  Moreover, the order which performs the process of shape | molding the bridge | bridging part W11 and the inner peripheral part W12 of the workpiece W10, and the process of shape | molding each groove | channel W13 * W14 is not limited to this embodiment. That is, after the grooves W13 and W14 are formed, the bridge portion W11 and the inner peripheral portion W12 of the workpiece W10 may be formed.

  Hereinafter, when the drive ring 10 manufactured by the method of manufacturing the drive ring 10 is used in the VN mechanism 1 that adjusts the exhaust gas flow rate of the turbocharger, the effect that the drive ring 10 has on the VN mechanism 1 and the turbocharger. explain.

  As shown in FIGS. 6 and 7, the VN mechanism 1 includes a drive ring 10, a plurality of vane arms 20, 20..., A VN plate 30, a plurality of VN vanes 40, 40. To do.

  The drive ring 10 is fitted with the vane arms 20, 20... At the arm grooves 13, 13.

Each of the vane arms 20, 20 ... has one end 21 fitted in each of the arm grooves 13, 13 ..., and supports the shaft 41 of each VN vane 40, 40 ... at the other end. . That is, the one end 21 of each vane arm 20, 20 ... is in contact with the side surface of each arm groove 13, 13 ..., respectively.
In addition, one end portion 21 of each vane arm 20, 20 ... is fitted into each arm groove 13, 13 ... on the radially outer side (bridge portion 11 side) of each arm groove 13, 13 ..., respectively. (See FIG. 2).

  The VN plate 30 is formed in a substantially annular shape having an outer diameter larger than that of the drive ring 10, and is arranged between the drive ring 10 and each of the VN vanes 40, 40,. The drive ring 10 and the like are supported.

Each of the VN vanes 40, 40... Has a shaft portion 41 extending in the axial direction of the drive ring 10. Each of the VN vanes 40, 40,... Is rotatably supported at one end of the shaft 41 by the other end of each vane arm 20, 20,. Supported as possible. Each of the VN vanes 40, 40... Is located on the back side of the VN plate 30 in FIG.
In FIG. 6, only a part of the VN vanes 40 is illustrated for easy understanding of the drawing, but actually, one VN vane 40 is supported by one vane arm 20.

  Further, an exhaust gas flow path of the turbocharger is formed on the back side of the VN plate 30 in FIG. 6, and each VN vane 40, 40... Is disposed on the exhaust gas flow path.

The drive link 50 has one end 51 fitted in the drive link groove 14 and the other end connected to a motor that can rotate forward and backward.
Further, the one end portion 51 of the drive link 50 is fitted into the drive link groove 14 on the radially outer side of the drive link groove 14 in the same manner as the one end portion 21 of the vane arm 20 (see FIG. 2).

Due to the rotation of the motor, one end 51 of the drive link 50 rotates around the other end of the drive link 50. The drive ring 10 is rotated by receiving a driving torque generated by the rotation of the other end of the drive link 50.
At this time, each vane arm 20, 20... Is torqued at its one end 21 and rotates around the other end. As the vane arms 20, 20... Rotate, the VN vanes 40, 40.

  In this way, the drive ring 10 synchronizes the vane arms 20, 20..., The VN vanes 40, 40. To rotate (operate).

  The VN mechanism 1 adjusts the exhaust gas flow rate of the turbocharger by adjusting the angles (openings) of the VN vanes 40...

  When the drive ring 10 is used for such a VN mechanism 1, one end portion 21 of each vane arm 20, 20... Is arranged so as to overlap the bridge portion 11 when viewed from the axial direction of the drive ring 10. it can.

If a driving ring as in the prior art is used, the outer diameter of the driving ring is larger than the length from the center of the driving ring 10 to the one end 21 of the vane arm 20 from the viewpoint of durability and reliability. It will be long enough.
On the other hand, when the drive ring 10 of the present embodiment is used, the outer diameter of the drive ring 10 can be set to a length that is slightly longer than the length from the center of the drive ring 10 to the one end 21 of the vane arm 20. .

  That is, since the outer diameter dimension of the drive ring 10 can be set small, the housing for housing the VN mechanism 1 can be downsized.

  Thus, when the drive ring 10 of this embodiment is used for the VN mechanism 1 of a turbocharger, the shape of the VN mechanism 1 can be reduced, so that the turbocharger can be reduced in size. Along with this, the cost of the turbocharger can be reduced.

  Next, another embodiment of the method for manufacturing the drive ring 10 will be described. Hereinafter, for convenience of explanation, it is assumed that a drive ring 110 having substantially the same shape as the drive ring 10 of the present embodiment is manufactured. The drive ring 110 according to another embodiment is used for the VN mechanism 1.

  First, in the manufacturing method of the drive ring 110 of another embodiment, as shown in FIG. 8, a substantially strip-shaped metal member having a short length in the short direction with respect to the length in the long direction is bent. More specifically, the workpiece W110 is bent into a substantially annular shape so that both end portions of the substantially strip-shaped workpiece W110 (metal member) abut (see reference numerals S111 and S112 shown in FIG. 8).

  The substantially strip-shaped workpiece W110 bent in this way is appropriately set in the longitudinal dimension based on the outer diameter or the like of the drive ring 110, and the bridge portion 111 and the inner peripheral portion 112 of the drive ring 110 are set. Based on the shape and the like, the length dimension in the short direction is appropriately set.

  After the workpiece W110 is bent in a substantially annular shape, the workpiece W110 is formed in a substantially annular shape by joining one end face with which the workpiece W110 abuts by welding (see symbol S112 shown in FIG. 8). ). That is, in the manufacturing method of the drive ring 110 of another embodiment, the welded portion W118 is formed on the workpiece W110.

Thus, when the substantially strip-shaped workpiece W110 is bent and formed into a substantially annular shape, the entire workpiece W110 is bent. Therefore, the entire workpiece W110 is work-hardened (see symbol S113 shown in FIG. 8).
When the entire workpiece W110 is bent as described above, the entire workpiece W110 is work-hardened to approximately the same extent as the work-hardening portion W16 of the present embodiment (see the work-hardening portion W116 shown in FIG. 8). . That is, in the workpiece W110, the inner peripheral portion W112 is further work-cured as compared with the workpiece W10 of the present embodiment.

As described above, the grooves W113 and W114 of the workpiece W110 are plastically processed and work-hardened when the substantially strip-shaped workpiece W110 is bent.
In particular, each of the grooves W113 and W114 is also work-hardened at the radially inner end thereof to approximately the same degree as the work-hardening part W16 of the present embodiment (see the work-hardening part W16 shown in FIG. 3 and FIG. 8). (Refer to the work hardening portion W116 shown).

As described above, the step of bending the workpiece W110 into a substantially annular shape functions as a fitting portion forming step of bending the workpiece W110 into a substantially annular shape so that both ends of the workpiece W110 are in contact with each other.
Further, plastic working is performed such that the workpiece W110 is bent into a substantially annular shape so that both end portions of the workpiece W110 come into contact with the arm grooves W113, W113, ... of the workpiece W110.

  After the workpiece W110 is formed into a substantially annular shape, the manufacturing method of the drive ring 110 of the present embodiment is the same. That is, after the bridge portion W111 of the workpiece W110 is bent with respect to the inner peripheral portion W112, the grooves W113 and W114 are formed (see symbols S114 and S115 shown in FIG. 8).

According to this, the whole inner peripheral part 112 of the drive ring 110 can be work-hardened to a state like the work hardening part 16 of this embodiment. (Refer to the work hardening parts W15 and W16 shown in FIG. 3 and the work hardening part W116 shown in FIG. 8).
Therefore, as compared with the drive ring 10 of the present embodiment, the grooves 113 and 114 can be further work-hardened from the radially inner end to the radially outer end of the drive ring 110. That is, the wear resistance of the drive ring 110 can be further improved.

When the substantially plate-shaped workpiece W10 is punched out as in the manufacturing method of the drive ring 10 of the present embodiment, parts other than the punched part are wasted. On the other hand, when the substantially strip-shaped workpiece W110 is bent, there is no wasted portion (see reference sign S11 shown in FIG. 3 and reference sign S111 shown in FIG. 8).
Further, the material yield is better when the workpiece W110 is bent as in another embodiment than the punching according to this embodiment.

  In other words, the method for manufacturing the drive ring 110 according to another embodiment can manufacture the drive ring 10 without waste and can improve the yield. Therefore, the drive ring 110 can be driven at a lower cost than the method for manufacturing the drive ring 10 according to the present embodiment. The ring 110 can be manufactured.

In addition, in the manufacturing method of the drive ring 110 of another embodiment, although the to-be-processed object W110 was shape | molded in the substantially annular shape initially, it is not limited to this.
That is, after the substantially strip-shaped workpiece W110 is bent so that the cross-sectional shape along the axial direction of the drive ring 110 is substantially L-shaped, both ends of the workpiece W110 are bent to form a substantially annular shape. It does not matter if it is molded.

  In this case, when the workpiece W110 is bent, the radially outer ends of the bridge portion W111 and the inner peripheral portion W112 of the workpiece W110 are work-hardened. Then, the inner peripheral portion W112 of the workpiece W110 is further work-hardened when bent into a substantially annular shape. That is, the entire workpiece W110 is work hardened.

  Further, the step of forming the grooves W113 and W114 of the workpiece W110 is not necessarily performed last, and may be performed first, for example.

  And since each groove | channel W113 * W114 is work-hardened by bending the both ends of the workpiece W110, in the process of shape | molding each groove | channel W113 * W114 of the workpiece W110, the workpiece W110 is punched out. Alternatively, the workpiece W110 may be cut off.

  That is, in another embodiment, the order in which the workpiece W110 is processed may be any order.

  When the drive ring 110 manufactured by using the method of manufacturing the drive ring 110 according to another embodiment is used in the VN mechanism 1 as described above, the welded portion 118 has each VN vane 40, 40,.・ It may affect the adjustment accuracy. That is, there is a possibility that each VN vane 40, 40... Has an opening different from the originally assumed opening.

  This is because when the drive link groove 114 is formed in the vicinity of the welded portion W118, the drive ring 110 rotates around the vicinity of the weld distortion.

Further, as described above, when the drive link groove 114 is formed in the vicinity of the welded portion 118, the durability reliability of the drive ring 110 may be lowered.
This is because the strength of the welded portion 118 is relatively lower than that of the other portions of the drive ring 110, and in the vicinity of the drive link 50 in the rotation of the drive ring 110 (that is, in the vicinity of the drive link groove 114). This is due to the fact that a high stress acts on.

  That is, in the manufacturing method of the drive ring 110 of another embodiment, it is preferable to form the drive link groove W114 as follows.

  That is, the welded portion W118 of the workpiece W110 is detected before the drive link groove W114 of the workpiece W110 is formed.

  Then, the grooves W113 and W114 are formed in a state where the welded portion W118 is positioned so as to be in a phase separated from the drive link groove W114 (see the drive link groove W114 and the welded portion W118 in FIG. 8).

  If the grooves W113 and W114 are first formed, the drive link groove W114 is formed at the center of the substantially strip-shaped workpiece W110, that is, at a position away from both ends (welded portions) of the workpiece W110. To do.

  Further, the stress acting when the drive ring 110 is rotated increases in the range of about 160 ° with the drive link groove 114 as the center.

Therefore, as shown in FIG. 9, the drive link groove 114 is preferably formed in a range of about 160 ° around the phase opposite to the welded portion 118. In other words, the welded portion 118 is preferably formed in a range of about 200 ° around the phase on the opposite side of the drive link groove 114.
That is, the drive link groove 114 is positioned so that the welded portion 118 is positioned in a range of about 100 ° in the clockwise direction and the counterclockwise direction in FIG. 9 around the phase on the opposite side of the drive link groove 114. It is preferable to mold (see range R shown in FIG. 9).

  According to this, the drive ring 110 does not rotate with the vicinity of the welding strain as a fulcrum, and high stress does not act on the welded portion 118. Therefore, it is possible to suppress a decrease in the adjustment accuracy of the VN vanes 40, 40... And a decrease in the durability reliability of the drive ring 110 as described above.

  In addition, although the drive ring 10 (drive ring 110) was used for the VN mechanism 1, it is not necessarily limited to this.

10 Drive ring 11 Bridge part (outer peripheral part)
12 Inner circumference 13 Arm groove (fitting part)
14 Drive link groove (fitting part)
W10 Workpiece W11 Bridge part (part corresponding to the outer peripheral part)
W12 Inner circumference (corresponding to the inner circumference)
W13 Part corresponding to arm groove (part corresponding to fitting part)

Claims (7)

An outer peripheral portion formed in an annular shape, an inner peripheral portion extending radially inward along the shape of the outer peripheral portion from one end side in the axial direction of the outer peripheral portion, and an inner peripheral portion extending from the inner peripheral portion to the outer peripheral portion. A manufacturing method of a drive ring, in which a plurality of fitting portions having a partially depressed shape are formed, fitted with predetermined members at the respective fitting portions, and the predetermined members are operated in synchronization with each other. And
An annular molding process for molding the workpiece, which is the drive ring in the manufacturing stage, into an annular shape;
Plasticity that bends one of a portion corresponding to the outer peripheral portion and a portion corresponding to the inner peripheral portion of the workpiece with respect to the other of the portion corresponding to the outer peripheral portion and the portion corresponding to the inner peripheral portion. An outer periphery forming step for performing processing and forming an outer peripheral portion and an inner peripheral portion of the drive ring;
A fitting portion machining step for performing plastic working on a portion corresponding to the fitting portion of the workpiece;
I do,
Manufacturing method of the drive ring. The annular molding step is
Based on the dimension along the axial direction of the outer peripheral part of the drive ring and the dimension along the radial direction of the inner peripheral part of the plate-like workpiece, it is performed by punching in an annular shape,
The manufacturing method of the drive ring of Claim 1. The mating part machining process
It is performed by bending the work piece into an annular shape so that both ends of the work piece come into contact with each other.
The manufacturing method of the drive ring of Claim 1. An outer peripheral portion formed in an annular shape, an inner peripheral portion extending radially inward along the shape of the outer peripheral portion from one end side in the axial direction of the outer peripheral portion, and an inner peripheral portion extending from the inner peripheral portion to the outer peripheral portion. A plurality of fitting portions having a shape recessed to a part, a driving ring that engages with a predetermined member at each of the fitting portions, and operates the predetermined member in synchronization;
The drive ring is
By forming the workpiece which is the drive ring in the manufacturing stage into an annular shape, it is formed into an annular shape,
The outer periphery and the inner periphery are
Plasticity that bends one of a portion corresponding to the outer peripheral portion and a portion corresponding to the inner peripheral portion of the workpiece with respect to the other of the portion corresponding to the outer peripheral portion and the portion corresponding to the inner peripheral portion. Formed by processing,
In the part corresponding to the fitting part of the workpiece,
Plastic working is done,
Drive ring. The drive ring is
By punching a plate-like workpiece based on the dimension along the axial direction of the outer peripheral part of the drive ring and the dimension along the radial direction of the inner peripheral part, it is formed into an annular shape.
The drive ring according to claim 4. As plastic working to the part corresponding to the fitting part,
Bending the workpiece into an annular shape so that both ends of the workpiece abut,
The drive ring according to claim 4. A variable nozzle mechanism using the drive ring according to any one of claims 1 to 6,
A vane arm that is fitted at one end to the fitting portion and rotates around the other end by rotation of the drive ring;
A shaft portion that is rotatably supported on the other end portion side of the vane arm is formed, and a VN vane that rotates around the shaft portion by rotation of the drive ring;
A drive link that is fitted at one end to the fitting portion and rotates the drive ring by turning the other end;
With
One end of the vane arm and the drive link is
It is fitted to the outer peripheral part side of the fitting part,
Variable nozzle mechanism using a drive ring.

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