JP2011021706A - Belleville spring reverse mounting determination structure and belleville spring reverse mounting determination method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belleville spring reverse mounting determination structure and a belleville spring reverse mounting determination method which are capable of surely determining the reverse mounting of a belleville spring by means of an actuator which is provided with a locking member, a spacer and a belleville spring and moves the shaft in an axial direction by rotating a rotor rotatably supported by a bearing. <P>SOLUTION: The method for determining the reverse mounting of the belleville spring enables determination of the reverse mounting of the belleville spring 22 because the reverse mounting of the belleville spring 22 causes an inner circumferential edge portion 22a to fall into the groove 20c of a spacer 20 and therefore the spacer 20 gets closer to a bearing 14 than the normal mounting, resulting in a low pressure for a moved position in the relationship between the moved position of the spacer 20 to the inner ring 14b of the bearing 14 and the pressure. An exactly opposite phenomenon to that in which an interference amount is increased at the time of the reverse mounting of the belleville spring 22 as in the conventional technology is utilized. Therefore, determination of the reverse mounting of the belleville spring 22 could not become difficult. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes a disc spring reverse attachment determination structure and disc spring reverse in an actuator that includes a locking member, a spacer, and a disc spring and moves a shaft in an axial direction when a rotating body that is rotatably supported by a bearing rotates. The present invention relates to an attachment determination method.

  A disc spring for receiving axial thrust is used in an actuator that drives various mechanisms by rotating a shaft in the axial direction by rotating a rotating body (see, for example, Patent Document 1).

  In order to discriminate the reverse mounting state of the disc spring, in Patent Document 1, a determination unit is arranged so that a part of the spring retainer protrudes in the axial direction, and when the disc spring is attached reversely, A disc spring interferes with the determination unit. Specifically, the inner peripheral side of the disc spring interferes with the determination unit.

  Due to this interference, the distance becomes larger when the disc spring is attached in reverse than the distance between the bearing inner ring and the spring retainer when the disc spring is normally attached. Thus, the reverse mounting state of the disc spring can be determined.

Japanese Patent Laying-Open No. 2007-303530 (page 6-7, FIG. 5-7)

  However, as shown in FIG. 6, which is a comparative example described in Patent Document 1, when the disc spring is attached in reverse, the outer peripheral side of the disc spring becomes the bearing side, and the shape such as the thickness of the inner ring of the bearing Depending on the case, the outer peripheral side of the disc spring may fall into the recess on the bearing side. In this case, the inner peripheral side of the disc spring approaches the bearing side, and the amount of interference between the inner peripheral side and the determination unit is reduced. Accordingly, it may be difficult to determine whether the disc spring is reversely attached in the configuration of Patent Document 1.

  Furthermore, for example, when the height (axial thickness) of the disc spring is lowered in order to improve the durability of the disc spring, the above-mentioned decrease in the amount of interference becomes significant, and the outer circumference side of the disc spring is the same as described above. In the case of falling into the recess on the bearing side, there is a possibility that reverse mounting of the disc spring cannot be determined at all with the configuration of Patent Document 1.

  The present invention is directed to a disc spring reverse mounting determination structure and a disc spring reverse mounting determination method that can reliably determine the reverse mounting state of a disc spring.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
The disc spring reverse mounting determination structure according to claim 1 is opposite to the inner ring of the bearing by a locking member that is disposed facing the inner ring of the bearing that rotatably supports the rotating body and is attached to the rotating body. Between the spacer and the inner ring of the bearing, the inner peripheral edge is in contact with the inner ring of the bearing and the outer peripheral edge is in contact with the spacer side. A disc spring reverse mounting determination structure in an actuator that includes a disc spring and moves the shaft in the axial direction by rotating the rotating body, wherein the spacer is positioned at a position facing the inner peripheral edge of the disc spring. A recess is formed.

  In this actuator, the disc spring disposed between the spacer and the inner ring of the bearing is disposed in a state where the inner peripheral edge thereof is in contact with the inner ring of the bearing and the outer peripheral edge is in contact with the spacer side.

  Therefore, when the disc spring is reversely attached, the inner peripheral edge of the disc spring comes into contact with the spacer side.When the bearing, disc spring, and spacer are arranged during assembly of the actuator, the inner peripheral portion of the disc spring is It will fall into the recess of the spacer.

  For this reason, compared with the case where the disc spring is in a normal mounting state, in the reverse mounting state, the spacer approaches the bearing side without bending the disc spring. By observing this state or measuring the position of the spacer, the reverse mounting state of the disc spring can be determined.

  Furthermore, in such a reverse mounting state of the disc spring, the locking member can be attached to the rotating body without increasing the deflection of the disc spring as compared to the normal mounting state. In other words, when the locking member is attached, it can be attached with a small pressing force.

Thus, the reverse mounting state of the disc spring can also be determined by the small pressing force for mounting the locking member.
As described above, the disc spring reverse mounting determination structure of the present invention is such that when the disc spring is in the reverse mounting state, the spacer is closer to the bearing side than when the disc spring is in the normal mounting state, At the time of attaching the locking member, it can be attached with a small pressing force. As described above, since a phenomenon opposite to that in which the amount of interference increases when the disc spring is reversely attached as in Patent Document 1, it is not difficult to determine the reverse attachment state of the disc spring. Thus, the reverse mounting state of the disc spring can be reliably determined.

  The disc spring reverse mounting determination structure according to claim 2, wherein the locking member is a retaining ring groove formed around an axis on an outer periphery of the rotating body. It is characterized by being a retaining ring to be attached to.

  Such a retaining ring can be used as the locking member. When attaching this retaining ring to the retaining ring groove formed around the axis on the outer periphery of the rotating body, the spacer is closer to the bearing side than when the disc spring is in the normal mounting state, or the retaining ring is attached. The reverse attachment state of the disc spring can be reliably determined by being able to attach with a small pressing force at the time.

  In the disc spring reverse mounting determination structure according to claim 3, in the disc spring reverse mounting determination structure according to claim 1 or 2, the concave portion is formed in an annular shape facing an inner peripheral edge of the disc spring. It is a groove.

As described above, the reverse mounting state of the disc spring can be reliably determined as described above by dropping the inner peripheral edge portion of the disc spring in the reverse mounting state into the annular groove.
In the disc spring reverse attachment determination structure according to claim 4, in the disc spring reverse attachment determination structure according to any one of claims 1 to 3, the spacer is in a state of penetrating a central space of the disc spring. A cylindrical base portion extending toward the inner ring side of the bearing, and a flange portion formed radially outward from the cylindrical base portion and having an edge portion on the outer side of the outer peripheral edge portion of the disc spring; It is formed in the said collar part in the position facing the inner peripheral part of the said disc spring.

  The spacer can be composed of such a cylindrical base and a collar. If the disc spring in the state of being penetrated through the cylindrical base portion is in the reversely attached state, the inner peripheral edge of the disc spring falls into the recess of the flange portion, so that the reversely attached state of the disc spring can be reliably determined as described above.

  In the disc spring reverse mounting determination structure according to claim 5, in the disc spring reverse mounting determination structure according to any one of claims 1 to 4, the actuator is rotated between the rotating body and the shaft. A moving body is provided, and a differential screw mechanism is formed by screw engagement between the rotating body and the rolling body and between the shaft and the rolling body.

Thus, the actuator can be configured as a differential screw mechanism. Even in such an actuator, it is possible to reliably detect and eliminate the reverse mounting state of the disc spring.
In the disc spring reverse mounting determination structure according to claim 6, in the disc spring reverse mounting determination structure according to any one of claims 1 to 5, the actuator moves in the axial direction by rotating the rotating body. The shaft is moved to drive a variable valve mechanism of an internal combustion engine.

  In this way, when the actuator drives the variable valve mechanism of the internal combustion engine, the reverse mounting state of the disc spring can be easily detected and eliminated, and high-accuracy driving of the actuator is ensured. Highly accurate output control can be maintained.

  The disc spring reverse mounting determination method according to claim 7 is a disc spring reverse mounting determination method in an actuator including the disc spring reverse mounting determination structure according to any one of claims 1 to 6, wherein the rotation After the bearing, the disc spring, and the spacer are disposed in the body in a penetrating state, the spacer is pressed against the inner ring side of the bearing against the biasing force of the disc spring, and the locking member is rotated. When attaching to the body, normal attachment and reverse attachment of the disc spring are determined from the relationship between the position of movement of the spacer toward the inner ring of the bearing and the pressure against the movement position.

  By adopting the above-described disc spring reverse attachment determination structure, the engaging member can be attached to the rotating body even in a state in which the disc spring is less bent in the reverse attachment state as described in the above claims. In other words, when the locking member is attached, it can be attached with a small pressing force.

Therefore, it is possible to determine the normal mounting state and the reverse mounting state of the disc spring from the relationship of the pressure with respect to the moving position.
In addition, as in Patent Document 1, since a phenomenon opposite to that in which the amount of interference increases in the reverse mounting state of the disc spring is used, it is not difficult to determine the reverse mounting state of the disc spring. Thus, the reverse mounting state of the disc spring can be reliably determined.

  The disc spring reverse mounting determination method according to claim 8 is the disc spring reverse mounting determination method according to claim 7, wherein the relationship of the pressure with respect to the moving position is compared with a normal mounting state of the disc spring. When the pressure is low, it is determined that the reverse mounting state is established.

  More specifically, when the disc spring is in the reverse mounting state compared to the normal mounting state, the pressure is lower in the relationship of the pressure with respect to the moving position. When this phenomenon occurs, it can be easily determined that the reverse mounting state is established.

FIG. 3 is a longitudinal sectional view of the actuator according to the first embodiment. The principal part enlarged view of FIG. The assembly explanatory drawing in the disc spring normal attachment state in Embodiment 1. FIG. The assembly explanatory drawing in the disc spring normal attachment state in Embodiment 1. FIG. The assembly explanatory drawing in the disc spring normal attachment state in Embodiment 1. FIG. The assembly explanatory drawing in the disc spring normal attachment state in Embodiment 1. FIG. FIG. 3 is an assembly explanatory view in the disc spring reversely attached state in the first embodiment. FIG. 3 is an assembly explanatory view in the disc spring reversely attached state in the first embodiment. FIG. 3 is an assembly explanatory view in the disc spring reversely attached state in the first embodiment. FIG. 3 is an assembly explanatory view in the disc spring reversely attached state in the first embodiment. 9 is a flowchart of a disc spring attachment state determination process executed in the second embodiment. The block diagram of the assembly apparatus which performs the disc spring attachment state determination process of FIG. 11 in a disc spring normal attachment state. The block diagram of the assembly apparatus which performs the disc spring attachment state determination process of FIG. 11 in a disc spring reverse attachment state. The longitudinal section principal part enlarged view of the actuator of other embodiment.

[Embodiment 1]
FIG. 1 is a longitudinal sectional view of an actuator 2 to which the above-described invention is applied, and FIG. 2 is an enlarged view of a main part thereof. This actuator 2 is attached to the outer surface of the cylinder head or cam carrier of the internal combustion engine EG, and drives the control shaft provided in the variable valve mechanism in the axial direction in order to drive the variable valve mechanism on the cylinder head. It is.

  The actuator 2 has a housing 4 and a control unit 6 disposed so as to close the housing 4 on the back side as main external components. A front end 8 a of the bearing holder 8 protrudes from a housing opening 4 a provided on the front side of the housing 4. An axial spline through hole 8c is formed at the center of the tip surface 8b formed in a circular shape at the tip 8a, and the output shaft 10 is fitted from the inside of the actuator 2 by its own spline 10a. In the combined state, the tip end portion 10b protrudes to the outside.

  The housing 4 is integrally formed with a mounting portion 12 that is long on the left and right (perpendicular to the paper surface) around the housing opening 4a. The front end surface of the mounting portion 12 is a mounting surface 12a formed in a flat shape. The entire actuator 2 is bolted to the internal combustion engine EG at the mounting surface 12a.

  The bearing holder 8 includes a tip portion 8a having a shape in which the above-described tip surface 8b is provided with a spline through hole 8c, an intermediate portion 8d having a diameter larger than the tip portion 8a, a base portion 8e having a maximum diameter, and a bearing formed rearward from the base portion 8e. It consists of a sheet portion 8f, and these are integrally formed so as to be coaxially arranged.

The bearing holder 8 disposed in the housing 4 is fixed to the housing 4 by bolting to the housing 4 at the base 8e.
A bearing 14 is disposed on the inner peripheral surface side of the bearing seat portion 8f. A nut 16a (corresponding to a rotating body) of a planetary differential screw type rotation-linear motion converting mechanism 16 (corresponding to a differential screw mechanism) is rotatably supported via the bearing 14. The outer ring 14a of the bearing 14 is sandwiched between the ring member 18 screwed into the bearing seat portion 8f and the base portion 8e, thereby preventing the bearing 14 from moving in the axial direction.

  Further, the inner ring 14b of the bearing 14 fitted to the nut 16a of the planetary differential screw type rotation-linear motion conversion mechanism 16 has one end side in the axial direction (the left end in the drawing) formed in the circumferential direction on the outer peripheral surface of the nut 16a. The other end side (the right end in the figure) faces the ring-shaped spacer 20.

  As shown in the enlarged view of FIG. 2, the spacer 20 includes a cylindrical base portion 20a that extends toward the inner ring 14b of the bearing 14 and a flange portion 20b that is formed radially outward from the cylindrical base portion 20a. Has been. In this flange portion 20b, an annular groove 20c (corresponding to a concave portion) is formed in contact with the connecting portion with the cylindrical base portion 20a on the center side.

  The disc spring 22 is arranged in a state where the central space is penetrated by the cylindrical base portion 20 a of the spacer 20. The disc spring 22 disposed in a compressed state has an inner peripheral edge portion 22 a that is in contact with the axial end surface 14 c of the inner ring 14 b of the bearing 14. Since the flange portion 20b has an edge on the outer side of the outer peripheral edge portion 22b of the disc spring 22, the outer peripheral edge portion 22b of the disc spring 22 is outside the groove 20c with respect to the flange portion 20b of the spacer 20. , That is, the flat contact receiving surface 20d.

  A retaining ring groove 16c is formed around the shaft on the outer periphery of the nut 16a, and a C ring 24 (corresponding to a locking member) as a retaining ring is attached thereto. As a result, the spacer 20 is prevented from moving in the opposite direction from the inner ring 14b of the bearing 14 in the axial direction. Therefore, the spacer 20 is pressed against the C ring 24 by the biasing force received from the outer peripheral edge 22 b of the disc spring 22.

Similarly, the inner ring 14 b of the bearing 14 is pressed against the locking ridge 16 b by the urging force received from the inner peripheral edge 22 a of the disc spring 22.
As a result, the inner ring 14b of the bearing 14 and the cylindrical base portion 20a of the spacer 20 form a gap 26, and the planetary differential screw type rotation-linear motion conversion mechanism 16 has the axial position in the housing 4 as a reference. Set to position.

  Further, a rotor 28 is fixed to the outer periphery of the nut 16a. A stator 30 having a coil 30 a is disposed in the housing 4 so as to face the rotor 28. When the control unit 6 electromagnetically drives the stator 30, the rotor 28 and the stator 30 function as a motor, and the nut 16 a is rotationally driven together with the rotor 28.

  The planetary differential screw type rotation-linear motion conversion mechanism 16 is mainly composed of a nut 16a, a shaft 10 as a sun shaft, and a planetary shaft (corresponding to a rolling element) disposed between the nut 16a and the shaft 10. Has been. The nut 16a and the planetary shaft are engaged with each other by a gear and a screw in the inner space of the nut 16a. Similarly, the planetary shaft and the shaft 10 are also engaged by a gear and a screw in the inner space of the nut 16a. When the nut 16a is rotationally driven by the motor as described above, the planetary shaft revolves around the shaft 10 in the nut 16a, and the shaft 10 is driven in the axial direction by a differential function by meshing of the screws. As the shaft 10 moves in the axial direction, the control shaft of the variable valve mechanism existing in the cylinder head of the internal combustion engine EG moves in conjunction with the axial direction, and this movement causes the valve lift of the intake valve in each cylinder of the internal combustion engine EG. The amount is continuously changed.

Here, the attachment work process of the C ring 24 will be described with reference to FIGS.
First, the planetary differential screw type rotation-linear motion conversion mechanism 16 is arranged with the axial direction perpendicular to the reference position of the work table, the bearing 14 is inserted into the nut 16a, and the locking protrusion 16b (FIG. 1). It arranges in the state which contact | abutted.

  As shown in FIG. 3, the disc spring 22 is inserted into the nut 16a with the side from which the inner peripheral edge 22a protrudes facing down, that is, toward the inner ring 14b side of the bearing 14. Further, the spacer 20 is also inserted into the nut 16a with the cylindrical base portion 20a side down, that is, toward the inner ring 14b side of the bearing 14. The disc spring 22 and the spacer 20 may be inserted into the nut 16a in a combined state.

  As a result, as shown in FIG. 4, the inner peripheral edge 22 a of the disc spring 22 abuts on the axial end surface 14 c of the inner ring 14 b, and the outer peripheral edge 22 b of the disc spring 22 is a flat contact with the flange 20 b of the spacer 20. It will be in the state contact | abutted to 20 d of contact surfaces. In this state, the spacer 20 is positioned at a height d1 from the axial end surface 14c of the inner ring 14b.

  Then, as shown in FIG. 5, the spacer 20 is pushed down against the repulsive force of the disc spring 22, and the C ring 24 is fitted into the retaining ring groove 16c as shown in FIG. The C ring 24 may be fitted into the retaining ring groove 16c while the C ring 24 abuts against the spacer 20 and the spacer 20 is pushed down by the C ring 24.

Next, the case where the disc spring 22 is reversely mounted will be described with reference to FIGS.
After the bearing 14 is arranged with respect to the nut 16a of the planetary differential screw type rotation-linear motion conversion mechanism 16, as shown in FIG. 7, the disc spring 22 is reversely inserted, that is, the side from which the inner peripheral edge portion 22a protrudes. That is, the outer peripheral edge 22b of the disc spring 22 is directed toward the bearing 14 and inserted into the nut 16a. Then, the spacer 20 is inserted into the nut 16a with the cylindrical base portion 20a side down, that is, toward the inner ring 14b side of the bearing 14. In addition, the case where it inserts in the nut 16a in the state which combined the disk spring 22 and the spacer 20 is also included.

  Since the disc spring 22 is reversely mounted, the inner peripheral edge portion 22a of the disc spring 22 does not contact the flat contact receiving surface 20d on the spacer 20 side as shown in FIG. 8, but contacts the cylindrical base portion 20a. Is inserted into the groove 20c, and abuts against the flange 20b of the spacer 20 in the groove 20c. For this reason, in the state where the disc spring 22 is not bent, the spacer 20 is closer to the bearing 14 than in the case of the above-described normal attachment state (FIG. 4).

  In addition to this, in the configuration of the present embodiment, the outer peripheral edge 22b of the disc spring 22 is located between the inner ring 14b and the outer ring 14a of the bearing 14, so that the disc spring 22 itself also falls, and further the spacer 20 approaches the bearing 14 side. In this state, the spacer 20 is positioned at a height d2 (<d1) from the axial end surface 14c of the inner ring 14b.

  Accordingly, as shown in FIG. 9, the spacer 20 is pushed down against the repulsive force of the disc spring 22 and the C-ring 24 is fitted into the retaining ring groove 16c as shown in FIG. 8 to 9) are slightly smaller than the amount of depression in the normal attachment state (FIGS. 4 to 5). For this reason, the C ring 24 can be fitted into the retaining ring groove 16c in a state where the repulsive force of the disc spring 22 is very weak.

  Thus, in the reverse mounting state of the disc spring 22, the pressing force when the C-ring 24 in a state where the C-ring 24 is in contact with the spacer 20 or the spacer 20 is pushed down to a position where the C-ring 24 can be fitted into the retaining ring groove 16c is reduced. It is much lower than in the normal mounting state. From this, it is possible to easily determine whether the disc spring 22 is in the reverse mounting state or in the normal mounting state by measuring a pressure gauge provided in the device for fitting the C ring 24 or the amount of electric power at the time of driving. . Even if it is not based on such a measurement by the machine, the disc spring 22 can be easily mounted in the reverse direction depending on the degree of repulsive force when the spacer 20 is pushed down to the position where the C-ring 24 can be fitted even in the mounting operation by the operator. It can be determined whether it is installed normally.

According to the first embodiment described above, the following effects can be obtained.
(1) In the actuator 2 of the present embodiment, when the disc spring 22 disposed between the spacer 20 and the inner ring 14b of the bearing 14 is in a normally attached state, the inner peripheral edge 22a of the disc spring 22 is The outer peripheral edge portion 22b is in contact with a region other than the groove 20c on the spacer 20 side.

  On the other hand, when the disc spring 22 is reversely attached, the inner peripheral edge portion 22a of the disc spring 22 falls into the groove 20c, which is a concave portion of the spacer 20, as described above. For this reason, the spacer 20 comes closer to the bearing 14 side than the case where the disc spring 22 is in a normal attachment state. Therefore, the reverse mounting of the disc spring 22 can be determined by observing or measuring the approached state.

  Furthermore, in the reverse mounting state of the disc spring 22, the C-ring 24 can be attached to the nut 16a with the disc spring 22 being less bent. That is, the relationship between the movement position of the spacer 20 toward the inner ring 14b side of the bearing 14 and the pressure with respect to this movement position indicates that the pressure is larger in the reverse mounting state of the disc spring 22 than in the normal mounting state. Get smaller. Accordingly, when the C-ring 24 is moved to the fitting position, the reverse mounting state of the disc spring 22 can also be determined by the fact that the pressing force at the moving position is smaller than that in the normal mounting state.

  As described above, the disc spring reverse attachment determination structure of the present embodiment uses a phenomenon that is completely opposite to that in which the amount of interference increases when the disc spring 22 is reversely attached as in Patent Document 1. For this reason, it is not difficult to determine reverse mounting of the disc spring 22. In this way, the reverse mounting state of the disc spring 22 can be reliably determined.

  As described above, reverse mounting of the disc spring 22 can be easily prevented and high-accuracy driving of the actuator 2 can be ensured. Therefore, output control of the internal combustion engine EG equipped with the variable valve mechanism driven by the actuator 2 can be performed with high accuracy. Can be maintained.

[Embodiment 2]
FIG. 11 shows a flowchart of a disc spring attachment state determination process for executing the disc spring reverse attachment determination method. FIG. 12 shows a block diagram of the assembling apparatus 52 that executes the disc spring attachment state determination process.

  The assembly device 52 includes a controller 54, a moving unit 56, a pressing unit 58, a display unit 60, and an operation unit 62. The controller 54 is a control unit configured around a computer. The moving unit 56 is a device that moves the pressing unit 58 in the axial direction of the planetary differential screw type rotation-linear motion conversion mechanism 16 according to an instruction from the controller 54, and the moving position of the pressing unit 58 is determined by an internal position sensor. It is detected and transmitted to the controller 54.

  The pressing portion 58 includes a pressing piece 58a at the tip for contacting the flange portion 20b of the spacer 20 and pressing the spacer 20 toward the bearing 14 side. A pressure sensor 58b is provided at the base of the pressing piece 58a. The pressure sensor 58 b detects the repulsive force that the pressing piece 58 a receives from the disc spring 22 via the spacer 20, and transmits it to the controller 54. In FIG. 12, the pressing position of the pressing portion 58 with respect to the flange portion 20b of the spacer 20 shows a part around the nut 16a. In practice, however, the entire surface or the same phase over the entire circumference around the nut 16a. The flange portion 20b of the spacer 20 is pressed at an interval.

The display unit 60 displays the disc spring attachment state determination result by the controller 54 or processing based on this result.
The operation unit 62 is an input device for inputting instructions to the controller 54 by an operator.

The disc spring attachment state determination process (FIG. 11) will be described. This process is a process that is repeatedly executed by the controller 54 at a constant time period (for example, several milliseconds).
When this process is started, first, it is determined whether or not the disc spring 22 and the spacer 20 are placed on the bearing 14 (S102). In the determination of whether or not the arrangement is complete, it is determined that the arrangement is complete when the operator inputs “complete” from the operation unit 62, and it is determined that the arrangement is not complete when there is no input. When the disc spring 22 and the spacer 20 are automatically arranged on the nut 16a by the arrangement device, the arrangement completion presence / absence determination is made by the arrangement completion signal from the arrangement device.

  If the arrangement is not completed (NO in S102), the process is temporarily exited. Thereafter, if the arrangement is not completed, the state determined as NO in step S102 continues, so that the substantial process is not performed in the disc spring attachment state determination process (FIG. 11).

  When the disc spring 22 and the spacer 20 are completely arranged (YES in S102), the moving portion 56 is driven to move the pressing portion 58 so that the pressing piece 58a is brought into contact with the spacer 20 and the spacer 20 is moved to the reference position. A movement process for lowering the value is performed (S104).

  Next, whether or not the spacer 20 has reached the reference position by the pressing part moving process is determined based on the position information transmitted from the moving part 56 (S106). If not reached yet (NO in S106), the process is temporarily exited. Thereafter, the pressing portion moving process (S104) is repeated until reaching.

  When the reference position, here the reference position set at the position immediately before the cylindrical base portion 20a of the spacer 20 contacts the inner ring 14b of the bearing 14 (YES in S106), the detection value of the pressure sensor 58b is read (S108). It is determined whether this pressure value is within the reference pressure range (S110).

  As described in the first embodiment, when the disc spring 22 is in the normal attachment state, the pressure range is higher than the reverse attachment state. Therefore, as the reference pressure range, when the disc spring 22 is in a normally attached state, the pressing force when the spacer 20 is pressed to the reference position is measured with a large number of samples, and the range of the pressing force is determined as the reference pressure range. It can be set as a range.

  As shown in FIG. 12, when the disc spring 22 is in the normally attached state, if the pressure value is within the reference pressure range (YES in S110), execution of fitting of the C ring 24 is instructed (S112). This C-ring fitting execution instruction is made, for example, as a display on the display unit 60 for an instruction to the operator, or as an instruction output to the C-ring fitting apparatus. Both the display on the display unit 60 and the instruction output to the C-ring fitting device may be made.

  As shown in FIG. 13, when the disc spring 22 is in the reverse mounting state, even if the spacer 20 is pushed down to the reference position, the disc spring 22 is less bent and the pressing piece as described in the first embodiment. The repulsive force received by 58a is small. Therefore, the pressure value output from the pressure sensor 58b is out of the reference pressure range (NO in S110). Therefore, a warning message “Reverse mounting of disc spring” is displayed on the display unit 60 (S114). Therefore, the operator or the C-ring fitting device finds out the mounting abnormality, so that the fitting of the C-ring 24 is not executed.

According to the second embodiment described above, the following effects can be obtained.
(1) With such an assembling apparatus 52, the attachment state of the disc spring 22 can be automatically determined, and the same effect as in the first embodiment can be produced.

[Other embodiments]
In Embodiment 1, the groove 20c is formed directly on the spacer 20 as shown in FIGS. 2 to 10. However, as shown in FIG. 14, the ring-shaped fitting member 119 whose cross section is bent at a right angle. May be configured as the spacer 121 by combining with the spacer member 120 in which no groove is formed. In this spacer 121, the region where the ring-shaped fitting member 119 is disposed and the region where the ring-shaped fitting member 119 is not disposed are present on the flat surface 120 d of the spacer member 120 facing the bearing 114. A recess 121c is formed at a position facing the peripheral edge 122a.

  In the configuration of FIG. 14, the surface of the fitting member 119 that faces the bearing 114 side corresponds to the planar contact receiving surface 121d. Other configurations such as the bearing 114 including the outer ring 114a and the inner ring 114b, the nut 116a of the planetary differential screw type rotation-linear motion conversion mechanism 116, the retaining ring groove 116c, the C ring 124, the bearing holder 108, and the like are as described above. The configuration is the same as that described in the first embodiment.

  In the second embodiment, the mounting state is determined by detecting the pressure at the reference position. In addition to this, as shown in FIGS. 4 and 8, the height when the disc spring 22 and the spacer 20 are arranged is high. Therefore, the mounting state of the disc spring 22 may be determined based on the initial height of the arrangement.

  In each of the above embodiments, an example in which the present invention is applied to a planetary differential screw type rotation-linear motion conversion mechanism has been shown, but a rotation provided with a retaining ring, a spacer, and a disc spring and supported rotatably by a bearing The disc spring reverse attachment determination structure and the disc spring reverse attachment determination method of the present invention can be similarly applied to other actuators that move the shaft in the axial direction by rotating the body.

  In each of the above embodiments, a C-ring (C-type retaining ring) is used as a retaining ring (also referred to as a circlip or a snap ring), but an E-ring (E-type retaining ring) may be used in addition to this.

  2 ... Actuator, 4 ... Housing, 4a ... Housing opening, 6 ... Control part, 8 ... Bearing holder, 8a ... Tip part, 8b ... Tip surface, 8c ... Spline through hole, 8d ... Intermediate part, 8e ... Base part, 8f ... bearing seat, 10 ... shaft, 10a ... spline, 10b ... tip, 12 ... mounting part, 12a ... mounting surface, 14 ... bearing, 14a ... outer ring, 14b ... inner ring, 14c ... axial end face, 16 ... planetary difference Dynamic screw type rotation-linear motion conversion mechanism, 16a ... nut, 16b ... locking projection, 16c ... retaining ring groove, 18 ... ring member, 20 ... spacer, 20a ... cylindrical base, 20b ... collar, 20c ... Groove, 20d: planar contact receiving surface, 22: disc spring, 22a: inner peripheral edge, 22b: outer peripheral edge, 24 ... C ring, 26 ... gap, 28 ... rotor, 30 ... stator, 30a ... coil, DESCRIPTION OF SYMBOLS 2 ... Assembly apparatus 54 ... Controller 56 ... Moving part 58 ... Press part 58a ... Pressing piece 58b ... Pressure sensor 60 ... Display part 62 ... Operation part 108 ... Bearing holder 114 ... Bearing 114a ... Outer ring, 114b ... Inner ring, 116 ... Planetary differential screw type rotation-linear motion conversion mechanism, 116a ... Nut, 116c ... Retaining ring groove, 119 ... Fitting member, 120 ... Spacer member, 120d ... Planar, 121 ... Spacer, 121c: recess, 121d: flat contact receiving surface, 122: disc spring, 122a: inner peripheral edge, 124: C ring, EG: internal combustion engine.

Claims (8)

A spacer disposed opposite to an inner ring of a bearing that rotatably supports the rotating body, and a locking member attached to the rotating body is prevented from moving in a direction opposite to the inner ring of the bearing, and the spacer And a disc spring arranged with an inner peripheral edge abutting against the inner ring of the bearing and an outer peripheral edge contacting the spacer side between the inner ring and the inner ring of the bearing, and the rotating body rotates. The disc spring reverse mounting determination structure in the actuator that moves the shaft in the axial direction by
The disc spring reverse mounting determination structure, wherein the spacer has a recess formed at a position facing the inner peripheral edge of the disc spring. 2. The disc spring reverse attachment determination structure according to claim 1, wherein the locking member is a retaining ring attached to a retaining ring groove formed around an axis on an outer periphery of the rotating body. Mounting judgment structure. 3. The disc spring reverse mounting determination structure according to claim 1, wherein the concave portion is a groove formed in an annular shape facing an inner peripheral edge of the disc spring. . The disc spring reverse mounting determination structure according to any one of claims 1 to 3, wherein the spacer includes a cylindrical base portion that extends toward the inner ring side of the bearing while penetrating through a central space of the disc spring, and the cylinder. And a flange that is formed radially outward from the base and has an edge on the outer side of the outer peripheral edge of the disc spring. The recess faces the inner peripheral edge of the disc spring at the flange. A disc spring reverse mounting determination structure characterized by being formed at a position. The disc spring reverse attachment determination structure according to any one of claims 1 to 4, wherein the actuator includes a rolling element between the rotating body and the shaft, and the rotating body and the rolling body A disc spring reverse attachment determination structure in which a differential screw mechanism is formed by screw engagement between the shaft and the shaft and the rolling element. The disc spring reverse mounting determination structure according to any one of claims 1 to 5, wherein the actuator moves the shaft in an axial direction by rotating the rotating body to provide a variable valve mechanism for an internal combustion engine. A disc spring reverse mounting determination structure characterized by being driven. A disc spring reverse mounting determination method in an actuator provided with the disc spring reverse mounting determination structure according to any one of claims 1 to 6,
After the bearing, the disc spring, and the spacer are arranged in a penetrating state on the rotating body, the spacer is pressed against the inner ring side of the bearing against the biasing force of the disc spring, and the locking member is A disc spring that determines whether the disc spring is normally attached or reversely attached based on the relationship between the movement position of the spacer toward the inner ring side of the bearing and the pressure with respect to the movement position when attaching to the rotating body. Reverse mounting determination method. 8. The disc spring reverse mounting determination method according to claim 7, wherein when the pressure is low compared to a normal mounting state of the disc spring, the disc spring reverse mounting determination method is determined to be in the reverse mounting state. A disc spring reverse mounting determination method characterized by the above.

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