JP2017094384A - Production method and production device of holder for rolling bearing and production method of valve timing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve processing tolerance of a holding hole of a holder for a rolling bearing.SOLUTION: A production method of a holder for a rolling bearing comprises: a preparation step for preparing a production device comprising a rotatable chuck, a first die and a first punch, and a second die and a second punch; an attachment step for attaching a workpiece comprising a cylindrical part to the chuck; a lower hole formation step for alternately repeating a punching step for punching the cylindrical part with a cutting blade part of the first die and a cutting blade part of the first punch, for forming a lower hole on the cylindrical part and a rotation step for rotating the workpiece, for forming plural lower holes on the cylindrical part of the workpiece; and a holding hole formation step for alternately repeating a shaving step for performing shaving to the lower holes with a cutting blade part of the second die and a cutting blade part of the second punch, for forming holding holes for rolling element, and a rotation step for rotating the workpiece, for forming plural holding holes on the cylindrical part of the workpiece.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method and apparatus for manufacturing a rolling bearing cage and a method for manufacturing a valve timing control apparatus.

  Set the work of the cage around the die processing part, give intermittent rotation to the work through a holding jig integrated with the work, and match the intermittent rotation and timing from the outside diameter side of the work A manufacturing method of a rolling bearing cage that is punched out is known (see Patent Document 1).

  In Patent Document 1, a pressing jig includes a cylindrical portion and a required number of pressing claws formed at a predetermined interval in the circumferential direction at one end portion of the cylindrical portion. In addition, it is described that these pressing claws and the workpiece are integrated by reducing the inner diameter surface of the pressing claws formed by the entire pressing claws.

JP 2013-185679 A

  However, when the overall length of the workpiece is increased, the die length is also increased, and the processing accuracy of the holding hole formed by punching may be deteriorated because the die is bent during the punching process.

According to the first aspect of the present invention, a rolling bearing cage manufacturing method includes a manufacturing apparatus having a rotatable chuck, a first die and a first punch, and a second die and a second punch. The tube portion is punched out by the preparation step of preparing, the attachment step of attaching a workpiece having a cylindrical tube portion to the chuck, the cutting blade portion of the first die and the cutting blade portion of the first punch, and A pilot hole forming step for forming a plurality of pilot holes in the cylindrical portion of the workpiece by alternately repeating a punching process for forming pilot holes in the cylindrical portion and a rotation step for rotating the workpiece. A shaving process for shaving the lower hole to form a holding hole for a rolling element by the cutting blade part of the second die and the cutting blade part of the second punch, and a rotation for rotating the workpiece. Motion process and alternately By returning Ri, and a holding hole forming step of forming a plurality of the holding hole in the cylindrical portion of the workpiece.
According to the second aspect of the present invention, a rolling bearing cage manufacturing method includes a preparation step of preparing a manufacturing apparatus having a rotatable chuck, a die, and a punch, and a bottomed cylindrical shape having a bottom portion and a cylindrical portion. An attaching step for attaching the workpiece to the chuck, and in a state where the bottom portion of the workpiece is sandwiched between the chuck and the die, the cylinder portion is punched out by the cutting blade portion of the die and the cutting blade portion of the punch. Forming a plurality of holding holes in the cylindrical portion of the work by alternately repeating a punching process for forming a holding hole for the rolling element in the part and a turning process for turning the work. A process.
According to the third aspect of the present invention, the manufacturing method of the valve timing control device includes the above-described manufacturing method of the rolling bearing cage.
According to a fourth aspect of the present invention, an apparatus for manufacturing a rolling bearing retainer includes: a chuck that is rotatable while holding a workpiece having a cylindrical portion; a chuck unit that holds the chuck; and the chuck unit that includes the chuck unit. A workpiece holding device having a first support device supported via a first elastic member so as to be movable in a first direction perpendicular to the rotation axis direction of the chuck, and opposed to the rotation axis direction of the chuck The first punching device and the second punching device that can be arranged, the first moving mechanism for moving the chuck in the direction of the rotation axis, and the first punching device and the second punching device are described above. A table having a second moving mechanism for moving in a rotation axis direction and a second direction orthogonal to the first direction, the first punching device and the second punching The punching device includes a punch arranged in parallel with the first direction, a punch holder for holding the punch, a die arranged to face the central axis direction of the punch, and a die holder for holding the die. And a second supporting device that supports the punch holder via a second elastic member so as to be movable in the first direction, and the punch size of the second punching device is the first punching device. Larger than the punch size of the punching device.
According to the fifth aspect of the present invention, the rolling bearing retainer manufacturing apparatus includes a chuck that is rotatable while holding a bottomed cylindrical workpiece having a bottom portion and a cylindrical portion, and a chuck unit that holds the chuck. And a work holding device having a first support device that supports the chuck unit via a first elastic member so as to be movable in a first direction orthogonal to the rotation axis direction of the chuck, and the chuck And a table having a moving mechanism for moving the chuck toward the punching device, the punching device being disposed in parallel with the first direction. A punch that holds the punch, a die that is disposed opposite to the punch in the central axis direction, and sandwiches the bottom of the workpiece with the chuck, and A die holder for holding a y, and a second supporting device for supporting via the second elastic member so as to be movable with the punch holder in the first direction.

  According to the present invention, the processing accuracy of the holding hole of the rolling bearing cage can be improved.

The longitudinal cross-sectional schematic diagram of a valve timing control apparatus. The exploded perspective view of a valve timing control device. III-III sectional view taken on the line of FIG. Sectional drawing of the holding cylinder of the holder | retainer cut | disconnected by the IV-IV line | wire of FIG. (A) is a schematic front cross-sectional view of the manufacturing apparatus, (b) is an enlarged schematic view of part B of (a), (c) is a schematic plan view of the punch of the first punching device, and (d) is the second punching device. The plane schematic diagram of a punch. The plane schematic diagram of a manufacturing apparatus. The flowchart for demonstrating the process of manufacturing the holder | retainer of the valve timing control apparatus which concerns on 1st Embodiment. The schematic diagram explaining the punching process. The cross-sectional schematic diagram of the cylinder part of the workpiece | work in which the pilot hole was formed. The figure which shows typically the state in the middle of the punching process at the time of forming the 2nd pilot hole. The figure which shows typically the state in the middle of shaving process. (A) is a figure which shows the dimension of the holding hole of the holder | retainer manufactured by the manufacturing method which concerns on a comparative example (equivalent to 2nd Embodiment). (B) is a figure which shows the dimension of the holding hole of the holder | retainer manufactured by the manufacturing method which concerns on 1st Embodiment. The flowchart for demonstrating the process of manufacturing the holder | retainer of the valve timing control apparatus which concerns on 2nd Embodiment.

  Hereinafter, an embodiment of a valve timing control device according to the present invention will be described with reference to the drawings. The valve timing control device controls the combustion chamber air supply so as to achieve a combustion state suitable for the rotational speed and load of the engine (internal combustion engine) in order to improve the fuel efficiency of the automobile and reduce the carbon dioxide emission. In addition, it is a device that freely varies the opening and closing timing of the engine valve.

-First embodiment-
FIG. 1 is a schematic longitudinal sectional view of the valve timing control device, and FIG. 2 is an exploded perspective view of the valve timing control device. 2, illustration of the camshaft 2, the timing chain 42, and the chain cover 40 is omitted. For convenience of explanation, the front-rear direction of the valve timing control device is defined as shown.

  As shown in FIG. 1 and FIG. 2, the valve timing control device includes a timing sprocket 1 that is a drive rotating body that is rotationally driven by a crankshaft of an engine (internal combustion engine), and a bearing on a cylinder head (not shown). A camshaft 2 rotatably supported and rotated by a rotational force transmitted from the timing sprocket 1; a cover member 3 disposed at a front position of the timing sprocket 1 and fixed to the chain cover 40 by a bolt 47; A phase changing mechanism 4 is provided between the timing sprocket 1 and the camshaft 2 and is a variable mechanism that changes the relative rotational phase of the timing sprocket 1 and the camshaft 2 in accordance with the engine operating state.

  The timing sprocket 1 is integrally formed of an iron-based metal as a whole, and an annular sprocket main body 1a having an inner peripheral surface formed with a step shape, and a timing chain wound around the sprocket main body 1a. And a gear portion 1 b that receives a rotational force from the crankshaft via 42. The timing sprocket 1 is interposed between a circular groove 1c formed on the inner peripheral side of the sprocket body 1a and an outer periphery of a thick flange portion 2a integrally provided at the front end portion of the camshaft 2. A ball bearing 43 is rotatably supported on the camshaft 2.

  An annular protrusion 1d is integrally formed on the outer peripheral edge of the front end portion of the sprocket body 1a. At the front end portion of the sprocket body 1a, an annular member 19 is disposed which is coaxially positioned on the front end side of the annular protrusion 1d and has a wave-shaped inner tooth 19a formed on the inner periphery. On the front end side of the annular member 19, a large-diameter annular female screw forming portion 6 (outer peripheral projection) that constitutes a part of the housing 5 of the electric motor 12 described later is disposed.

  Six bolt insertion holes 1e, 19b are formed through the outer peripheral portions of the sprocket body 1a and the annular member 19 at substantially equal intervals in the circumferential direction. The female screw forming portion 6 has six female screw holes 6a formed at positions corresponding to the bolt insertion holes 1e and 19b. The timing sprocket 1, the annular member 19, and the female screw forming portion 6 are fastened together by bolts 7 with bolts 7 inserted into the bolt insertion holes 1 e and 19 b and the female screw holes 6 a.

  The sprocket body 1a and the annular member 19 are configured as a casing of a speed reduction mechanism described later. The annular protrusion 1d, the annular member 19 and the female thread forming portion 6 of the sprocket body 1a are set to have substantially the same outer diameter. On a part of the inner peripheral surface of the sprocket body 1a, a stopper convex portion 1f, which is a fan-shaped engaging portion, is formed to a predetermined length range along the circumferential direction.

  The housing 5 includes a housing main body 5a that is a cylindrical portion formed of a ferrous metal material by press molding into a bottomed cylindrical shape, and a sealing plate 11 that seals the front end opening of the housing main body 5a. Yes.

  The housing body 5a has a disk-shaped bottom 5b on the rear end side. A large-diameter shaft insertion hole 5c through which an eccentric shaft 30 described later is inserted is formed substantially at the center of the bottom 5b. A cylindrical extension 5d (inner peripheral protrusion) protruding in the axial direction of the camshaft 2 is integrally provided at the hole edge of the shaft insertion hole 5c. A female thread forming portion 6 is integrally fixed to the outer peripheral side of the front end surface of the bottom portion 5b by welding.

  The camshaft 2 has two drive cams per cylinder for opening an intake valve (not shown) on the outer periphery. At the front end of the camshaft 2, a rolling bearing retainer (hereinafter simply referred to as a retainer 94) that holds a plurality of rollers (hereinafter referred to as rollers 34) that are a plurality of rolling elements is coupled from the axial direction by cam bolts 10. Has been.

  3 is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, a stopper groove 2b, which is a locking portion into which the stopper protrusion 1f of the sprocket body 1a is engaged, is formed in the flange portion 2a of the camshaft 2 along the circumferential direction. The stopper concave groove 2b is formed in an arc shape having a predetermined length in the circumferential direction, and both end edges of the stopper convex portion 1f rotated in this length range abut against the circumferential facing surfaces 2c and 2d, respectively. Thus, the relative rotational position of the camshaft 2 on the maximum advance angle side or the maximum retard angle side with respect to the timing sprocket 1 is regulated. The stopper projection 1f and the stopper groove 2b constitute a stopper mechanism.

  As shown in FIG. 1, the cam bolt 10 is integrally formed with a flange-shaped seat surface portion 10c at the end edge of the head portion 10a on the shaft portion 10b side. On the outer periphery of the shaft portion 10b, a male screw portion is formed which is screwed to the female screw portion formed in the inner axial direction from the end portion of the cam shaft 2.

  In the cage 94, the driven portion 9 and the holding cylinder 41 are integrally formed of an iron-based metal material. The driven portion 9 is composed of a disc portion 9a formed on the rear end side and a cylindrical cylindrical portion 9b formed integrally on the front end side. The disc portion 9a is integrally provided with an annular step projection 9c having substantially the same outer diameter as that of the flange portion 2a of the camshaft 2 at a substantially central position in the radial direction of the rear end surface. The outer peripheral surface of 2a is inserted and arranged in the inner periphery of the inner ring 43a of the third ball bearing 43 while facing each other. This facilitates the centering operation between the camshaft 2 and the driven portion 9 during assembly. The outer ring 43b of the third ball bearing 43 is press-fitted and fixed to the inner peripheral surface of the circular groove 1c of the sprocket body 1a.

  As shown in FIGS. 1 and 2, the holding cylinder 41 has a cylindrical shape, and protrudes from the outer peripheral portion of the disc portion 9a in the same direction as the cylindrical portion 9b. A plurality of holding holes 41 b are formed in the holding cylinder 41 at substantially equal intervals along the circumferential direction of the holding cylinder 41. Each holding hole 41b is a substantially rectangular opening, and holds a plurality of rollers 34 in a rollable manner.

  As shown in FIG. 1, the holding cylinder 41 has a distal end portion 41 c in the direction of the bottom portion 5 b of the housing 5 via a space portion 44 that is an annular recess formed between the female screw forming portion 6 and the extending portion 5 d. It extends to. The cylindrical portion 9b is formed with a through hole 9d through which the shaft portion 10b of the cam bolt 10 is inserted. A needle bearing 28 is provided on the outer peripheral side of the cylindrical portion 9b.

  As shown in FIGS. 1 and 2, the cover member 3 is formed integrally with a relatively thick synthetic resin material, and covers a cover body 3 a that swells in a cup shape, and an outer periphery of the rear end portion of the cover body 3 a And an annular bracket 3b integrally formed therewith. The cover main body 3a is arranged so as to cover the front end side of the phase changing mechanism 4, that is, the outer periphery of the front end side including the sealing plate 11 of the housing main body 5a with a predetermined gap. On the other hand, in the bracket 3b, bolt insertion holes 3c are formed through six boss portions integrally formed on the outer periphery.

  As shown in FIG. 1, the cover member 3 is fixed to the chain cover 40 by a plurality of bolts 47 in which the bracket 3b is inserted through the bolt insertion hole 3c. On the inner peripheral surface of the front end portion of the cover body 3a, an inner and outer double slip ring 48 is embedded and fixed in a state where each inner end surface is exposed. At the upper end portion of the cover member 3, a connector portion 49 is provided in which a connector terminal 49a connected to the slip ring 48 via a conductive member is fixed. The connector terminal 49a is energized from a battery power source (not shown) via the control unit 21, or is de-energized.

  A large-diameter oil seal 50, which is a seal member, is interposed between the inner peripheral surface on the rear end side of the cover body 3a and the outer peripheral surface of the housing 5. The large-diameter oil seal 50 has a substantially U-shaped cross section, and an annular base portion 50a on the outer peripheral side of the large-diameter oil seal 50 in which a core metal is embedded inside a synthetic rubber base material is a cover. It is fitted and fixed to an annular portion 3d provided on the inner peripheral surface of the main body 3a. On the inner peripheral side of the annular base portion 50a, an annular seal portion 50b made of synthetic rubber is formed integrally with the outer peripheral surface of the housing body 5a via the spring force of the backup spring.

  The phase change mechanism 4 includes an electric motor 12 that is an actuator disposed on the substantially coaxial front end side of the camshaft 2, and a speed reduction mechanism that decelerates the rotational speed of the electric motor 12 and transmits it to the camshaft 2. It is configured.

  The electric motor 12 is a DC motor with a brush. The electric motor 12 is fixed to a housing 5 that is a yoke that rotates integrally with the timing sprocket 1, a motor shaft 13 that is an output shaft that is rotatably provided inside the housing 5, and an inner peripheral surface of the housing 5. A pair of semicircular arc permanent magnets 14 and 15 and a stator 16 fixed to the inner bottom surface of the sealing plate 11 are provided.

  As shown in FIGS. 1 and 2, the motor shaft 13 is formed in a cylindrical shape and functions as an armature, and an iron core rotor 17 having a plurality of poles is fixed to the outer periphery at a substantially central position in the axial direction. An electromagnetic coil 18 is wound around the outer periphery of the iron core rotor 17. A commutator 20 is press-fitted and fixed to the outer periphery of the small diameter portion of the front end of the motor shaft 13. The commutator 20 is electrically connected to an electromagnetic coil 18 in each segment divided into the same number as the number of poles of the iron core rotor 17.

  The stator 16 has a disk-shaped resin holder 22 fixed to the inner bottom wall of the sealing plate 11 by four screws 22a, and is disposed through the resin holder 22 and the sealing plate 11 in the axial direction. Two tip brushes 23 inside and outside in the circumferential direction in which each tip surface is slidably contacted with a pair of slip rings 48 and power is supplied to the inner circumference side of the resin holder 22 so as to be able to advance and retreat inwardly. Includes a second brush 24 that is in sliding contact with the outer peripheral surface of the commutator 20. As shown in FIG. 1, a shaft insertion hole 29 through which one end portion of the motor shaft 13 and the like are inserted is formed at a central position between the resin holder 22 and the sealing plate 11.

  The first brush 23 is connected by a pigtail harness and is urged toward the slip ring 48 by the spring force of the torsion spring that is elastically contacted. The second brush 24 is connected by a pigtail harness and is urged toward the commutator 20 by the spring force of the elastic torsion spring.

  The motor shaft 13 is freely rotatable by a second ball bearing 35 and a needle bearing 28 disposed on an axial side portion of the second ball bearing 35 on the outer peripheral surface of the shaft portion 10b on the head 10a side of the cam bolt 10. It is supported by. A cylindrical eccentric shaft portion 30 constituting a part of the speed reduction mechanism is integrally provided at the rear end portion of the motor shaft 13 on the camshaft 2 side.

  The needle bearing 28 includes a cylindrical retainer 28a that is press-fitted into the inner peripheral surface of the eccentric shaft portion 30, and needle rollers 28b that are a plurality of rolling elements that are rotatably held inside the retainer 28a. Yes. The needle roller 28 b rolls on the outer peripheral surface of the cylindrical portion 9 b of the driven portion 9.

  In the second ball bearing 35, the inner ring 35 a is fixed in a sandwiched state between the front end edge of the cylindrical part 9 b of the driven part 9 and the seat surface part 10 c of the cam bolt 10, while the outer ring 35 b is fixed to the inner periphery of the motor shaft 13. Positioning is supported in the axial direction between the formed step portion and the snap ring 36 which is a retaining ring.

  Between the outer peripheral surface of the motor shaft 13 (eccentric shaft portion 30) and the inner peripheral surface of the extending portion 5d of the housing 5, a small diameter oil that prevents leakage of lubricating oil from the inside of the speed reduction mechanism into the electric motor 12 is provided. A seal 32 is provided. The small diameter oil seal 32 provides frictional resistance against the rotation of the motor shaft 13 by having the inner peripheral portion elastically contacted with the outer peripheral surface of the motor shaft 13.

  The control unit 21 performs the engine control by detecting the current engine operating state based on information signals from various sensors such as a crank angle sensor, an air flow meter, a water temperature sensor, and an accelerator opening sensor (not shown). The control unit 21 controls the rotation of the motor shaft 13 by energizing the electromagnetic coil 18 and controls the relative rotation phase of the camshaft 2 with respect to the timing sprocket 1 via a speed reduction mechanism.

  As shown in FIGS. 1 and 2, the speed reduction mechanism includes an eccentric shaft portion 30 that performs an eccentric rotational motion, a first ball bearing 33 that is a bearing provided on the outer periphery of the eccentric shaft portion 30, and the first ball. A roller 34 provided on the outer periphery of the bearing 33 and a retainer 94 that allows the roller 34 to move in the radial direction while holding the roller 34 in the rolling direction.

  In the eccentric shaft portion 30, the shaft center X <b> 2 of the cam surface formed on the outer peripheral surface is slightly eccentric in the radial direction from the shaft center X <b> 1 of the motor shaft 13. The first ball bearing 33 and the roller 34 are configured as a planetary meshing portion. The first ball bearing 33 is formed in a large-diameter annular shape, and is disposed in a state where the entire ball bearing 33 substantially overlaps at the radial position of the needle bearing 28. In the first ball bearing 33, the inner ring 33a is press-fitted and fixed to the outer peripheral surface of the eccentric shaft portion 30, and the roller 34 is always in contact with the outer peripheral surface of the outer ring 33b.

  An annular gap C is formed on the outer peripheral side of the outer ring 33b, and the entire first ball bearing 33 can be moved in the radial direction along with the eccentric rotation of the eccentric shaft portion 30, that is, eccentrically movable. Yes. Each roller 34 is fitted in the inner teeth 19a of the annular member 19 while moving in the radial direction along with the eccentric movement of the first ball bearing 33, and is guided in the circumferential direction by both side edges of the holding holes 41b of the cage 94. While swinging in the radial direction.

FIG. 4 is a cross-sectional view of the holding cylinder 41 of the holder 94 cut along line IV-IV in FIG. As shown in FIG. 4, the dimension of the holding hole 41b (the length of the short side of the holding hole, that is, the length in the circumferential direction) M, the interval between the adjacent holding holes 41b (the distance between the edges of the adjacent holding holes) The relationship between W and the punching dimension (the thickness of the punched portion) T of the holding hole 41b is expressed by the following equations (1) and (2).
T ≧ 0.5M (1)
W ≦ 2.0M (2)

  These dimensional relationships are appropriately determined in consideration of the rigidity of the cage 94 and the like. In order to improve the control responsiveness of transmitting the rotational force of the electric motor 12 to the camshaft 2 and to suppress the generation of a hitting sound during the operation of the speed reduction mechanism, the holding hole 41b is formed straight to hold the roller 34 and the roller. It is desirable to set the clearance with the hole size M small.

  Since it is necessary to accurately align the positions of the inner teeth 19a and the rollers 34, it is preferable that all the holding holes 41b are aligned in the central axis direction of the cage 94. In the present embodiment, each holding hole 41b extends accurately toward the central axis of the holder 94 and the clearance between the roller 34 and the holding hole 41b is set small by a manufacturing method of the holder 94 described later. be able to.

  Lubricating oil is supplied into the speed reduction mechanism by a lubricating oil supply device. The lubricating oil supply device has an oil supply passage (not shown) that is formed inside the bearing of the cylinder head and is supplied with lubricating oil from the main oil gallery. As shown in FIG. 1, the lubricating oil supply device includes an oil supply hole (not shown) that is formed in the internal axial direction of the camshaft 2 and communicates with the oil supply passage via a groove groove, and the interior of the driven portion 9. A small-diameter oil supply hole 45 is formed so as to penetrate in the axial direction, with one end opening to the oil supply hole and the other end opening near the needle bearing 28 and the first ball bearing 33. The lubricating oil supply device has three large-diameter oil discharge holes (not shown) that are also formed through the driven portion 9.

  By this lubricating oil supply device, the lubricating oil is supplied and stays in the space 44, and the lubricating oil is sufficiently supplied from here to the movable parts such as the first ball bearing 33 and each roller 34. The lubricating oil staying in the space 44 is prevented from leaking into the housing 5 by the small diameter oil seal 32.

  As shown in FIG. 1, a first cap 51 having a substantially U-shaped cross section for closing the space on the cam bolt 10 side is press-fitted and fixed inside the front end of the motor shaft 13. A second cap 52 having a substantially U-shaped cross-section for closing the through hole 3e is press-fitted and fixed to the edge of the working through hole 3e formed at the substantially center of the cover body 3a.

  Hereinafter, the operation of this embodiment will be described. When the crankshaft (not shown) of the engine is driven to rotate, the timing sprocket 1 is rotated via the timing chain 42, and the rotational force is transmitted to the housing 5 via the annular member 19 and the female screw forming portion 6, so that the electric motor 12 is Synchronously rotate. On the other hand, the rotational force of the annular member 19 is transmitted from the roller 34 to the camshaft 2 via the retainer 94. As a result, the cam (not shown) of the camshaft 2 opens and closes the intake valve (not shown).

  During a predetermined engine operation after the engine is started, the electromagnetic coil 18 of the electric motor 12 is energized from the control unit 21 via the slip ring 48 or the like. As a result, the motor shaft 13 is rotationally driven, and the rotational force of this rotational force is transmitted to the camshaft 2 via the speed reduction mechanism.

  That is, when the eccentric shaft portion 30 rotates eccentrically with the rotation of the motor shaft 13, each roller 34 is guided in the radial direction by the respective holding holes 41 b of the retainer 94 for each rotation of the motor shaft 13, and thus one of the annular members 19. It moves over the inner teeth 19a while rolling to the other adjacent inner teeth 19a, and repeats this in order to make rolling contact in the circumferential direction. By the rolling contact of the rollers 34, the rotation of the motor shaft 13 is decelerated, and the rotational force is transmitted to the driven portion 9. The reduction ratio at this time can be arbitrarily set according to the number of rollers 34 or the like.

  As a result, the camshaft 2 rotates relative to the timing sprocket 1 in the forward and reverse directions and the relative rotational phase is converted, so that the opening / closing timing of the intake valve is controlled to be advanced or retarded.

  As shown in FIG. 3, the maximum position restriction (angular position restriction) of forward and reverse relative rotation of the camshaft 2 with respect to the timing sprocket 1 is such that each side surface of the stopper convex portion 1f is opposite to each of the opposing surfaces 2c and 2d of the stopper groove 2b. This is done by contacting either one.

  That is, the driven portion 9 shown in FIG. 1 rotates in the same direction as the rotation direction of the timing sprocket 1 with the eccentric rotation of the eccentric shaft portion 30, so that one side surface of the stopper convex portion 1f is formed by the stopper concave groove 2b. Further contact with the opposing surface 2c on one side is restricted from further rotation in the same direction. As a result, the relative rotation phase of the camshaft 2 with respect to the timing sprocket 1 is changed to the maximum on the advance side. On the other hand, when the driven portion 9 rotates in the direction opposite to the rotation direction of the timing sprocket 1, the other side surface of the stopper convex portion 1f abuts on the opposite surface 2d on the other side of the stopper concave groove 2b and the same direction beyond that. Rotation is regulated. As a result, the relative rotation phase of the camshaft 2 with respect to the timing sprocket 1 is changed to the maximum on the retard side. As a result, the opening / closing timing of the intake valve is converted to the maximum on the advance side or the retard side, and the fuel efficiency and output of the engine can be improved.

  The manufacturing apparatus 100 of the retainer 94 of the valve timing control device according to the present embodiment and the workpiece 410 that is an intermediate product of the retainer 94 will be described. Fig.5 (a) is a front cross-sectional schematic diagram of the manufacturing apparatus 100, FIG.5 (b) is the B section enlarged schematic diagram of Fig.5 (a). FIG. 5C is a schematic plan view of the punch 60F of the first punching apparatus 101, and FIG. 5D is a schematic plan view of the punch 60S of the second punching apparatus 102. FIG. 6 is a schematic plan view of the manufacturing apparatus 100. In the following, as illustrated, the X axis, the Y axis, and the Z axis are defined, the direction parallel to the X axis is the X direction, the direction parallel to the Y axis is the Y direction, and the direction parallel to the Z axis is Z This will be described as a direction. The X axis, the Y axis, and the Z axis are orthogonal to each other. As will be described later, the X direction is a direction in which the first punching device 101 and the second punching device 102 move. The Y direction is a direction in which the work holding device 108 moves. The Z direction is the moving direction of the pressing portion 65 of the press machine, that is, the punching direction.

  As shown in FIG. 5, the workpiece 410 is an intermediate product of the retainer 94 and has a bottomed cylindrical shape having a disk-shaped bottom portion 419 and a cylindrical tube portion 411 rising from the outer peripheral portion of the bottom portion 419. Yes. In addition, the cylindrical shape in this specification includes a case where the height (axial length) is shorter than the radius, as illustrated. The bottom portion 419 is a portion corresponding to the disc portion 9 a of the cage 94, and the cylinder portion 411 is a portion corresponding to the holding cylinder 41 of the cage 94. The workpiece 410 is made of low carbon steel having a carbon content of 0.2% or less, and the Vickers hardness after quenching is Hv653 or more.

  At the center of the bottom portion 419 of the work 410, an attachment portion 415 protruding in the same direction as the cylindrical portion 411 is provided. The attachment portion 415 has a cylindrical shape and is a portion corresponding to the cylindrical portion 9 b in the driven portion 9 of the cage 94.

  As shown in FIGS. 5 and 6, the manufacturing apparatus 100 includes a work holding device 108, a first punching device 101, a second punching device 102, and a table 105. The table 105 is placed horizontally on the floor. Inside the table 105, a Y-direction moving mechanism 55 that moves the workpiece holding device 108 in the Y direction, and an X-direction moving mechanism 54 that moves the first punching device 101 and the second punching device 102 in the X direction are provided. It has been.

  The work holding device 108 includes a chuck 157, a chuck unit 152, and a chuck support device 159. The chuck 157 includes a columnar shaft portion 157a and a grip portion 157b provided at one end of the shaft portion 157a. The shaft portion 157 a is inserted into the through hole of the chuck unit 152, and the chuck 157 is rotatably held by the chuck unit 152.

  The grip portion 157b is provided with a base portion 157c and a plurality of claws 157d protruding from the base portion 157c in the + Y direction. The claw 157d is inserted into the opening of the attachment portion 415 and grips the attachment portion 415 from the inside, that is, chucks. In the present embodiment, an example in which the inner peripheral portion of the cylindrical mounting portion 415 of the workpiece 410 is chucked is shown, but the outer peripheral portion of the disc-shaped bottom portion 419 may be chucked.

  In a state where the workpiece 410 is attached to the chuck 157, the center axis of the cylinder portion 411 of the workpiece 410 and the rotation center axis CL1 of the chuck 157 coincide with each other. On the chuck unit 152, a circular convex portion that fits into a circular concave portion of a support portion 159b, which will be described later, protrudes downward. The chuck unit 152 includes an angle indexing device that determines a rotation angle around the rotation center axis (also referred to as a rotation axis) CL1 of the chuck 157 and rotates the chuck 157 at a predetermined rotation angle.

  The chuck support device 159 includes a support portion 159b that supports the chuck unit 152 via a coil spring 159c, and a fixing portion 159a that protrudes downward from the support portion 159b. The support portion 159b is provided with a circular recess having an opening in the upper portion, and a coil spring 159c is disposed in the circular recess of the support portion 159b. The circular convex portion of the chuck unit 152 is slidably fitted in the Z direction in the circular concave portion of the support portion 159b. By fitting the circular convex portion of the chuck unit 152 and the circular concave portion of the support portion 159b, the movement of the chuck unit 152 in the X direction and the Y direction is restricted. The coil spring 159 c has a lower end fixed to the bottom surface of the circular concave portion of the support portion 159 b and an upper end fixed to the circular convex portion of the chuck unit 152. As described above, the chuck unit 152, the chuck 157, and the work 410 are installed on the support portion 159b via the coil spring 159c so as to be movable in the Z direction.

  The fixing portion 159a is disposed on a guide rail (not shown) disposed in a groove provided in the table 105 extending in the Y direction. A Y-direction moving mechanism 55 is disposed in the groove extending in the Y direction, and the fixed portion 159 a is fixed to the movable portion of the Y-direction moving mechanism 55. The Y-direction moving mechanism 55 can move the work holding device 108 in the Y direction by driving the Y-direction actuator.

  The first punching device 101 and the second punching device 102 have the same configuration except that the sizes of the cutting blade portions 60a of punches 60F and 60S described later and the die holes 62a of the dies 62F and 62S are different. Hereinafter, the first punching device 101 will be described as a representative, and description of the second punching device 102 will be omitted. Note that the punch 60F of the first punching device 101 and the punch 60S of the second punching device 102 will be collectively referred to as the punch 60 unless it is particularly necessary to distinguish them. In addition, the die 62F of the first punching device 101 and the die 62S of the second punching device 102 will be collectively referred to as the die 62 when it is not necessary to distinguish between them.

  The first punching device 101 includes a punch 60, a punch holder 64 that holds the punch 60, a die 62 that is disposed to face the punch 60 in the direction of the central axis CL2, a die holder 66 that holds the die 62, and a tool support device. 150. The cutting blade portion 60a of the punch 60 has a rectangular column shape. As shown in FIG. 5C, the cutting edge portion 60a of the punch 60F of the first punching apparatus 101 has a short side dimension xp1 and a long side dimension yp1. As shown in FIG. 5D, the cutting edge portion 60a of the punch 60S of the second punching device 102 has a short side dimension of xp2 and a long side dimension of yp2. The magnitude relationship between xp1 and xp2 is xp1 <xp2, and the magnitude relationship between yp1 and yp2 is yp1 <yp2. That is, the size of the cutting edge 60a of the punch 60S of the second punching device 102 is slightly larger than the size of the cutting edge 60a of the punch 60F of the first punching device 101.

  The punch holder 64 holds the punch 60 so that the central axis of the punch 60 is parallel to the Z direction that is the punching direction. The punch holder 64 has a surface that is pressed by the pressing portion 65 of the press. The pressing portion 65 of the press machine can be reciprocated in the Z direction.

  The die 62 has a thick disk shape, and one end portion (+ Y direction end portion) of the die 62 in the central axis direction is fixed to the die holder 66 and the other end portion in the central axis direction (end portion 62e in the −Y direction) is fixed. The bottom of the work 410 is brought into contact. On the central axis of the die 62, a circular recess in which the attachment portion 415 of the workpiece 410 is disposed is formed. The die 62 can also be said to be a bottomed cylindrical shape with a short axial height.

  The tool support device 150 includes a support portion 150b that fixes and supports the die holder 66, and a fixing portion 150a that protrudes downward from the support portion 150b. The fixed portion 150 a is disposed on a guide rail (not shown) disposed in a groove provided in the table 105 that extends in the X direction. An X-direction moving mechanism 54 is disposed in the groove extending in the X direction, and the fixed portion 150 a is fixed to the movable portion of the X-direction moving mechanism 54. The X direction moving mechanism 54 can move the first punching device 101 in the X direction by driving the X direction actuator. The second punching device 102 has the same configuration, and when the first punching device 101 moves in the X direction, the second punching device 102 also moves integrally in the X direction.

  A die 62 is fixed to the side of the die holder 66. The center axis of the die 62 is arranged so as to coincide with the rotation center axis CL1 of the chuck 157. A die hole 62 a through which the punch 60 is inserted is provided at the top (upper end) of the die 62. The die hole 62 a constitutes the cutting blade portion of the die 62 and corresponds to the size of the cutting blade portion 60 a of the punch 60.

  The die holder 66 is provided with a columnar guide post 68 extending in the Z direction. A coil spring 67 is fitted to the protruding portion of the guide post 68 protruding upward from the upper end surface of the die holder 66, and the punch holder 64 is supported by the die holder 66 via the coil spring 67. The punch holder 64 is provided with a circular through hole, and a guide post 68 is inserted into the through hole so as to be slidable in the Z direction. By fitting the guide post 68 and the through hole of the punch holder 64, the movement of the punch holder 64 in the X direction and the Y direction is restricted. Thus, the punch holder 64 and the punch 60 are installed on the die holder 66 via the coil spring 67 so as to be movable in the Z direction.

  The punch 60 is fixed to the punch holder 64 and moves in the Z direction integrally with the punch holder 64. The die hole 62a and the cutting blade portion 60a of the punch 60 are disposed to face each other. The positions of the punch 60 and the die hole 62a are set so that the center axis of the die hole 62a and the center axis CL2 of the punch 60 coincide. The central axis CL2 of the punch 60 is set on the central axis of the die 62 extending in the Y direction, and is set to be parallel to the Z axis, that is, orthogonal to the first central axis CL.

  When the pressing portion 65 of the pressing machine moves downward (−Z direction) and the punch holder 64 is pressed downward (−Z direction) by the pressing portion 65, the punch holder 64 resists the elastic force of the coil spring 67. And pushed down. Thereby, the front-end | tip part 60c of the cutting blade part 60a of the punch 60 is inserted in the die hole 62a. Accordingly, by placing the processing target portion of the workpiece 410 between the die 62 and the punch 60, the processing target portion can be punched.

  Hereinafter, a method for manufacturing the retainer 94 of the valve timing control device according to the present embodiment will be described. FIG. 7 is a flowchart for explaining a process of manufacturing the retainer 94 of the valve timing control device. As shown in FIG. 7, the manufacturing method of the cage 94 includes a preparation step S100, an attachment step S110, a first positioning step S120, a pilot hole forming step S130, a second positioning step S150, and a holding hole forming step. S160 and removal process S180 are included.

-Preparation process-
In preparation process S100, the manufacturing apparatus 100 of the holder | retainer 94 and the workpiece | work 410 are prepared. When the preparation step S100 is completed, the process proceeds to the attachment step S110.
-Installation process-
In the attachment step S110, the workpiece 410 is attached to the chuck 157 (chucking). The bottom portion 419 of the workpiece 410 is brought into contact with the base portion 157c of the grip portion 157b of the chuck 157. When the attachment step S110 is completed, the process proceeds to the first positioning step S120.

-First positioning step-
In the first positioning step S <b> 120, the workpiece holding device 108 and the first punching device 101 are positioned, and the processing target portion of the workpiece 410 is disposed between the punch 60 and the die 62. In the first positioning step S120, as shown in FIG. 6, first, the first punching device 101 is moved in the X direction by the X-direction moving mechanism 54, and the first punching device 101 is moved in the rotational axis direction of the chuck 157. And the center axis of the die 62 of the first punching device 101 is made to coincide with the rotation center axis CL1 of the chuck 157.

  Next, the workpiece holding device 108 is moved toward the first punching device 101 by the Y-direction moving mechanism 55, and the −Y direction end portion 62 e of the die 62 is moved to the bottom portion 419 of the workpiece 410 as shown in FIG. 5. Strike. As a result, the bottom portion 419 of the workpiece 410 is held between the base portion 157c of the chuck 157 and the -Y direction end portion 62e of the die 62.

  FIG. 8 is a schematic diagram for explaining the punching process. When the workpiece holding device 108 and the first punching device 101 are positioned in the first positioning step S120, as shown in FIG. 8A, the machining axis PA of the cylinder portion 411 of the workpiece 410 and the center of the punch 60 are obtained. The axis CL2 matches. Further, a gap S is formed between the workpiece 410 and the receiving surface (top surface) of the die 62. In the present specification, the machining axis PA refers to a virtual central axis of the machining target area (hole machining area).

-Preliminary hole formation process-
As shown in FIG. 7, when the first positioning step S120 is completed, the process proceeds to a pilot hole forming step S130. In the lower hole forming step S130, the cylindrical portion 411 is punched from the outer diameter side to the inner diameter side by the die hole 62a (the cutting blade portion of the die 62) and the cutting blade portion 60a of the punch 60 to form the lower hole H1 in the cylindrical portion 411. This is a step of forming a plurality of pilot holes H1 in the cylindrical portion 411 of the workpiece 410 by alternately repeating the punching step S134 and the rotation step S138 of rotating the workpiece 410.

-Punching process-
In the punching step S134, the bottom portion 419 of the workpiece 410 is pressed in a direction (+ Y direction) parallel to the rotation center axis CL1 of the chuck 157, and the bottom portion 419 is in contact with the −Y direction end portion 62e of the die 62. A lower hole H <b> 1 is formed in the cylindrical portion 411 by the die hole 62 a and the cutting edge portion 60 a of the punch 60. That is, in the punching step S134, the bottom hole 419 is formed by punching in a state where the bottom portion 419 of the workpiece 410 is sandwiched between the base portion 157c of the chuck 157 and the -Y direction end portion 62e of the die 62.

  The punching process will be described in detail with reference to FIG. From the state shown in FIG. 8A, the punch holder 64 is pushed down by the pressing portion 65 (see FIG. 5A) of the press machine, and the tip portion 60 c of the cutting blade portion 60 a of the punch 60 is brought into contact with the cylindrical portion 411. When the punch holder 64 is further pushed down, the pressing force is transmitted to the chuck unit 152 (see FIG. 5A) via the workpiece 410, and the chuck unit 152 is subjected to the elastic force of the coil spring 159c (see FIG. 5A). Move downward (-Z direction).

  The amount of movement in the −Z direction from when the tip end portion 60c of the punch 60 comes into contact with the cylindrical portion 411 of the workpiece 410 to the state shown in FIG. 8B corresponds to the gap S. Thereby, the inner peripheral surface of the cylinder part 411 and the outer peripheral surface (receiving surface) of the die | dye 62 contact. That is, the gap S becomes zero.

  From the state shown in FIG. 8 (b), the pressing portion 65 (see FIG. 5 (a)) of the press presses the cutting blade portion 60a of the punch 60 downward with a predetermined load, and FIG. 8 (c). As shown in FIG. 4, the cylindrical portion 411 is punched out by the cutting blade portion 60a and the die hole 62a. When the pressing portion 65 (see FIG. 5A) of the press machine is raised, the punch holder 64 is pushed up by the coil spring 67 (see FIG. 5A) and returns to the position before processing. Further, the chuck unit 152 is pushed up by a coil spring 159c (see FIG. 5A) and returns to the position before processing. By the above operation, as shown in FIG. 8D, a pilot hole H1 having a size slightly smaller than the holding hole 41b is formed at the formation position of the holding hole 41b.

-Rotation process-
In the rotation step S138, the chuck 157 is rotated by a predetermined angle while the work 410 is held on the chuck 157 by the angle indexing device of the chuck unit 152. The rotation angle θ [deg] is 360 [deg] / N, where N is the number of holding holes 41b. When the chuck unit 152 rotates by the rotation angle θ [deg], the machining axis PA of the part to be processed next coincides with the center axis CL1 of the punch 60.

  In the lower hole forming step S130, N punch holes H1 are formed by repeating the punching step S134 and the rotating step S138 as one cycle and repeating this cycle N times.

  FIG. 9 is a schematic cross-sectional view of the cylindrical portion 411 of the workpiece 410 in which the lower hole H1 is formed. In FIG. 9, for convenience, the holding hole 41b formed in the holding hole forming step described later is indicated by a broken line. As shown in FIG. 9, each pilot hole H <b> 1 has a circumferential dimension M <b> 1 on the outer diameter side of the cylinder part 411 longer than a circumferential dimension M <b> 2 on the inner diameter side of the cylinder part 411. Further, both side surfaces of the lower hole H1 are asymmetric with respect to the holding hole central axis (processing axis PA), and the inclination angle with respect to the holding hole central axis (processing axis PA) on one side surface is the holding hole on the other side surface. It is larger than the inclination angle with respect to the central axis (processing axis PA). In FIG. 9, the inclination angle of the side surface of the lower hole H <b> 1 is exaggerated and shown larger than the actual angle. The reason why the pilot hole H1 is tapered will be described with reference to FIG.

  FIG. 10 is a diagram schematically showing a state in the middle of the punching process when the second pilot hole H1 is formed. As shown in FIG. 10, when a punching process is performed to form a second pilot hole H1 (hereinafter referred to as a second pilot hole H12), a material between the cutting edge portion 60a of the punch 60 and the die hole 62a is formed. However, a part of the material plastically flows toward the adjacent lower hole H1 (hereinafter referred to as the first lower hole H11). As a result, the inner peripheral portion of the first lower hole H11 on the second lower hole H12 side bulges toward the inside of the first lower hole H11.

  The volume Vd of the bulging part 60d corresponds to the difference between the volume Vf of the outflow part 60f pushed away by the cutting edge part 60a of the punch 60 and the volume Vb of the inflow part 60b flowing into the die hole 62a (Vd = Vf−Vb). ). As a result, as shown in FIG. 9, the pilot hole H <b> 1 has a tapered shape in which the dimension between the side surfaces becomes smaller toward the center of the workpiece 410. Such plastic flow is remarkable when the above-described equation (2) is satisfied.

-Second positioning step-
As shown in FIG. 7, when the pilot hole forming step S130 is completed, the process proceeds to the second positioning step S150. The second positioning step S150 is a step in which the workpiece 410 is held by the chuck 157 and the process proceeds from the prepared hole forming step S130 to the holding hole forming step S160. In the second positioning step S150, the second punching device is located at the position where the central axis CL2 of the punch 60F of the first punching device 101 is disposed in the pilot hole forming step S130 with the workpiece 410 held by the chuck 157. The central axis CL2 of the 102 punch 60S is arranged.

  In the second positioning step S150, as shown in FIG. 6, the workpiece holding device 108 is moved away from the first punching device 101 by the Y-direction moving mechanism 55, that is, in the −Y direction. Thereafter, the first punching device 101 and the second punching device 102 are moved in the + X direction by the X-direction moving mechanism 54 so that the second punching device 102 is disposed opposite to the rotation axis direction of the chuck 157, and the second The center axis of the die 62 of the punching device 102 is aligned with the rotation center axis CL1 of the chuck 157. Accordingly, the center axis CL2 of the punch 60S is positioned on the rotation center axis CL1 of the chuck 157.

  The workpiece holding device 108 is moved toward the second punching device 102 by the Y direction moving mechanism 55, and the −Y direction end portion 62 e of the die 62 is abutted against the bottom portion 419 of the workpiece 410 as shown in FIG. 5. Accordingly, the bottom portion 419 of the workpiece 410 is sandwiched between the base portion 157c of the chuck 157 and the −Y direction end portion 62e of the die 62.

  When the positioning is performed in the second positioning step S150, the machining axis PA of the cylinder portion 411 of the workpiece 410 and the center axis CL2 of the punch 60 coincide with each other. Further, a gap S is formed between the workpiece 410 and the receiving surface of the die 62.

-Holding hole formation process-
As shown in FIG. 7, when the second positioning step S150 is completed, the process proceeds to the holding hole forming step S160. Since the holding hole forming step S160 is performed in the same procedure as the prepared hole forming step S130, detailed description thereof is omitted. In the holding hole forming step S160, a portion corresponding to the above-described punching process is referred to as a shaving process in order to punch a portion where the pilot hole H1 has already been formed. In the shaving step S164, the cylindrical portion 411 is punched from the outer diameter side to the inner diameter side by the die hole 62a (the cutting blade portion of the die 62) and the cutting blade portion 60a of the punch 60, and the opening edge portion of the lower hole H1 is shaved. This is a step of forming the holding hole 41b by processing. In the holding hole forming step S160, the cylindrical portion 411 of the workpiece 410 is alternately repeated by repeating the shaving step S164 corresponding to the punching step S134 and the turning step S168 corresponding to the turning step S138. A plurality of holding holes 41b are formed.

  In the shaving process S164, the bottom portion 419 of the workpiece 410 is pressed in a direction (+ Y direction) parallel to the rotation center axis CL1 of the chuck 157, and the bottom portion 419 is in contact with the −Y direction end portion 62e of the die 62. A holding hole 41 b is formed in the cylindrical portion 411 by the die hole 62 a and the cutting blade portion 60 a of the punch 60. That is, in the shaving process S164, the holding hole 41b is formed by performing punching in a state where the bottom 419 of the workpiece 410 is sandwiched between the base 157c of the chuck 157 and the -Y direction end 62e of the die 62.

  Also in the shaving process S164, as in the punching process S134 shown in FIG. 8, the inner peripheral surface of the cylindrical portion 411 and the outer peripheral surface (receiving surface) of the die 62 can be brought into contact in advance (gap S). = 0). This is because the size of the cutting edge portion 60a of the punch 60 of the second punching device 102 is larger than the opening size of the lower hole H1, and thus the chuck unit 152 can be pushed down by the punch 60.

  By performing the shaving processing step S164, the bulging portion 60d described above can be scraped off, so that the hole processing accuracy can be further improved. FIG. 11 is a diagram schematically illustrating a state in the middle of the shaving process. As shown in FIG. 11, when shaving is performed, a portion (cut portion) pushed away by the cutting blade portion 60a of the punch 60 plastically flows toward the opening center portion of the pilot hole H1 according to the conditions of the tresker. Thereby, the part pushed away by the cutting blade part 60a of the punch 60 can be prevented from plastically flowing in the direction of the adjacent lower hole H1 or the adjacent holding hole 41b. As a result, as shown in FIG. 4, each holding hole 41b can be formed in a straight shape.

  According to the present embodiment, even if the plate thickness T of the cylindrical portion 411 serving as the punching portion varies depending on the product, variation in the accuracy of the dimension M of the holding hole 41b can be suppressed. In particular, this is effective when the relationship between the dimension M of the holding hole 41b, the interval W between the holding holes 41b adjacent to each other, and the punching dimension T of the holding hole 41b is configured as in the above-described formulas (1) and (2). According to the present embodiment, since the tolerance of the plate thickness T can be set larger than in the conventional case, the production cost can be reduced.

  In addition, the dimension difference between the short side dimension xp1 of the cutting blade part 60a of the punch 60 of the first punching device 101 and the short side dimension xp2 of the cutting blade part 60a of the punch 60 of the second punching device 102 is 0. It is desirable to be about 1 mm to 0.6 mm. Accordingly, the lower hole forming step S130 and the holding hole forming step S160 can be performed without changing (removing and attaching) the workpiece 410. As a result, the coaxial displacement between the lower hole H1 and the holding hole 41b can be prevented. According to the present embodiment, for example, even when the dimensional difference between the dimension xp1 and the dimension xp2 is as small as 0.1 to 0.2 mm, the holding hole 41b can be punched with high accuracy.

-Removal process-
If holding hole formation process S160 is completed, it will progress to removal process S180. In the removal step S180, the workpiece holding device 108 is moved away from the second punching device 102 by the Y-direction moving mechanism 55, that is, in the −Y direction. Then, the workpiece | work 410 in which the some holding hole 41b was formed from the chuck | zipper 157, ie, the holder | retainer 94, is removed. The completed retainer 94 is incorporated as a part of the valve timing control device, and the valve timing control device is completed (see FIG. 1).

-Experimental results-
The experimental results by the present inventors are shown in FIG. Fig.12 (a) is a figure which shows the dimension of the holding hole 41b of the holder | retainer 94 manufactured by the manufacturing method which concerns on a comparative example. In the comparative example, the pilot hole forming step S130 by the first punching device 101 was omitted, and only the holding hole forming step S160 by the second punching device 102 was performed. That is, the shaving process in the holding hole forming process S160 of the comparative example corresponds to the punching process in the above-described embodiment. In the comparative example, when the holding hole forming step S160 is performed, the phenomenon shown in FIG. 10 occurs because the lower hole H1 is not formed. FIG.12 (b) is a figure which shows the dimension of the holding hole 41b of the holder | retainer 94 manufactured by the manufacturing method which concerns on 1st Embodiment.

  In FIG. 12, the horizontal axis indicates the position number of the holding hole 41b, and the vertical axis indicates the dimensions M1 and M2 of the holding hole 41b. The dimension M1 of the holding hole 41b is the length of the short side of the holding hole 41b on the outer peripheral portion of the cylindrical portion 411, that is, the outer diameter side (the annular member 19 side shown in FIG. 1) of the cylindrical portion 411. The dimension M2 is the length of the short side of the holding hole 41b on the inner peripheral portion of the cylindrical portion 411, that is, on the inner diameter side of the cylindrical portion 411 (on the first ball bearing 33 side shown in FIG. 1). The dimensions M1 and M2 were measured with calipers.

The position numbers of the holding holes 41b coincide with the order in which the holding holes 41b are formed. For example, the position number of the holding hole 41b formed first is “1”. The dimensional relationship of the workpiece 410 used in the experiment is as shown below.
-The punching dimension (thickness of the punched portion) T of the holding hole 41b is 2.5 [mm].
The dimension xp2 of the short side of the cutting edge portion 60a of the punch 60 of the second punching device 102 is 3.05 [mm].
-The interval W between adjacent holding holes 41b is 3.2 [mm].
-The number N of holding holes 41b is 30 [pieces]

  In the comparative example, the outer diameter side dimension M1 is larger by about 0.02 mm to 0.03 mm than the inner diameter side dimension M2. In contrast, in the first embodiment in which the holding hole forming step S160 is performed through the pilot hole forming step S130, the difference between the outer diameter side dimension M1 and the inner diameter side dimension M2 is suppressed to about 0.005 mm. I was able to. That is, in this embodiment, the difference between the dimension M1 and the dimension M2 can be set to 0 mm or more and 0.02 mm or less. Comparing 30 dimensions of the inner diameter side dimension M2, in the comparative example, there was a variation of about 0.010 mm, but in the first embodiment, the variation could be suppressed to about 0.005 mm.

According to the embodiment described above, the following operational effects can be obtained.
(1) In the preparation step S100, a workpiece holding device 108 having a rotatable chuck 157, a first punching device 101 having a die 62F and a punch 60F, and a second punching device 102 having a die 62S and a punch 60S are prepared. To do. In the attachment step S <b> 110, the workpiece 410 having the cylindrical tube portion 411 is attached to the chuck 157. In the prepared hole forming step S130, a plurality of prepared holes H1 are formed in the cylindrical portion 411 of the workpiece 410 by alternately repeating the punching step S134 and the rotating step S138 for rotating the workpiece 410. In the punching step S134, the cylindrical portion 411 is punched from the outer diameter side to the inner diameter side by the die hole (cutting blade portion) 62a of the die 62F and the cutting blade portion 60a of the punch 60F, and the lower hole H1 is formed in the cylindrical portion 411. Form. In the holding hole forming step S160, the plurality of holding holes 41b are formed in the cylindrical portion 411 of the workpiece 410 by alternately repeating the shaving processing step S164 and the rotating step S168 of rotating the workpiece 410. In the shaving process S164, the lower hole H1 is shaved by the die hole (cutting edge part) 62a of the die 62S and the cutting edge part 60a of the punch 60S to form the holding hole 41b of the roller 34 that is a rolling element. .

  Thereby, the processing accuracy of the holding hole 41b of the cage 94 for a rolling bearing can be improved. By improving the processing accuracy of the holding hole 41b, the clearance in the short side direction (circumferential direction) between the roller 34 and the holding hole 41b can be set small. For this reason, the control responsiveness which transmits the rotational force of the electric motor 12 to the camshaft 2 can be improved, and the generation of a hitting sound during operation of the speed reduction mechanism can be suppressed.

(2) By performing the shaving process step S164, the direction of the lines formed by the process and the direction in which the roller 34 rolls can be matched, so the wear resistance of the cage 94 can be improved and the variable has excellent durability. A valve timing device can be provided.

(3) In the punching step S134, in the state where the bottom portion 419 of the bottomed cylindrical workpiece 410 is sandwiched between the chuck 157 and the die 62F, the cylinder portion is formed by the die hole 62a of the die 62F and the cutting edge portion 60a of the punch 60F. 411 is punched from the outer diameter side to the inner diameter side to form a pilot hole H1 in the cylindrical portion 411. Similarly, in the shaving step S164, the bottom hole 419 of the bottomed cylindrical workpiece 410 is sandwiched between the chuck 157 and the die 62S, and the lower hole is formed by the die hole 62a of the die 62S and the cutting edge 60a of the punch 60S. The holding hole 41b of the roller 34 is formed by shaving H1. As described above, in the present embodiment, the bottom portion 419 of the bottomed cylindrical workpiece 410 is punched in a state in which the bottom portion 419 is in contact with the end faces of the dies 62F and 62S. Since punching can be performed in a state where both ends of the workpiece 410 in the axial direction are supported (both-end supported state), the hole machining accuracy is higher than when punching is performed in a cantilever-supported state where the workpiece may bend. Can be improved. In addition, the extending direction of all the holding holes 41b can be accurately aligned toward the center axis of the workpiece 410, that is, the rotation center axis CL2 of the chuck 157. Furthermore, since the ends 62e of the dies 62F and 62S can be in a compressed state, it is possible to prevent cracks from occurring in these portions during punching. Thereby, the thickness (dimension E shown by FIG.5 (b)) of the edge part 62e of die | dye 62F and 62S can be shortened, and the axial direction dimension of the holder | retainer 94 can be shortened.

(4) After the pilot hole forming step S130, in a state where the work 410 is held by the chuck 157, the second axis is located at the position where the central axis of the punch 60F of the first punching device 101 is arranged in the pilot hole forming step S130. The first positioning step S120 for arranging the central axis of the punch 60S of the punching device 102 is performed. When shifting from the lower hole forming step S130 to the holding hole forming step S160, the work of attaching and detaching the workpiece 410 from the chuck 157 is not required, so that the production efficiency can be improved.

(5) The chuck 157 is supported by the chuck support device 159 via the coil spring 159c so as to be movable in the Z direction orthogonal to the rotation axis direction of the chuck 157. In the punching step S134, after the gap S is formed between the cylindrical portion 411 and the die 62F, the punch portion 60F is pressed against the cylindrical portion 411 to bring the cylindrical portion 411 into contact with the die 62F, and then the die 62F. The cylindrical portion 411 is punched from the outer diameter side to the inner diameter side by the die hole 62a and the cutting edge portion 60a of the punch 60F to form the lower hole H1 in the cylindrical portion 411. In the shaving processing step S164, after the gap S is formed between the cylindrical portion 411 and the die 62S, the punch 60S is pressed against the cylindrical portion 411 to bring the cylindrical portion 411 into contact with the die 62S, and then the die 62S. The lower hole H1 is shaved by the die hole 62a and the cutting edge 60a of the punch 60S to form the holding hole 41b of the roller 34.

  When the punching load is applied, the gap S can be made zero, so that the cylindrical portion 411 can be prevented from bending and the accuracy of the punching hole can be improved. In addition, it is possible to prevent the occurrence of excessive burrs. Thereby, it is possible to prevent the fallen burrs from being pinched between the holding holes 41b and 41b and damaging the roller 34.

(6) Since the punching process is performed using only the single punch 60F provided in the first punching apparatus 101, the variation in the dimensions of the respective pilot holes H1 can be reduced. Since the shaving process is performed using only the single punch 60S provided in the second punching device 102, the variation in the dimensions of the holding holes 41b can be reduced.

(7) In the punching step S134, the punch 60F is punched from the outer diameter side toward the inner diameter side of the cylindrical portion 411. Further, in the shaving process S164, the punch 60S is punched from the outer diameter side to the inner diameter side to punch the lower hole H1. Thereby, since a general-purpose press can be adopted, the manufacturing cost can be reduced.

(8) According to the present embodiment, the length M1 of the short side of the holding hole 41b in the outer peripheral part of the cylindrical part 411 and the length M2 of the short side of the holding hole 41b in the inner peripheral part of the cylindrical part 411 The difference can be 0 mm or more and 0.02 mm or less.

(9) According to the present embodiment, when the length of the long side of the holding hole 41b is 0.5 times or more than the length of the short side of the holding hole 41b, or in the circumferential direction of the cylindrical portion 411 When the interval W between the matching holding holes 41b is less than or equal to twice the length M (the outer diameter side dimension M1) of the short side of the holding holes 41b, the effect of improving the machining accuracy is particularly enhanced as compared with the conventional case. Can do.

-Second Embodiment-
A method for manufacturing the rolling bearing cage according to the second embodiment will be described with reference to FIG. FIG. 13 is a flowchart for explaining a process of manufacturing the cage of the valve timing control device according to the second embodiment. In the figure, the same reference numerals are assigned to the same or corresponding parts as those in the first embodiment, and the differences will be mainly described.

  In the first embodiment, after performing the pilot hole forming step S130 by the first punching device 101, the holding hole forming step S160 by the second punching device 102 is performed (see FIG. 7). On the other hand, in the second embodiment, as shown in FIG. 13, the pilot hole forming step S130 is omitted. That is, in the holding hole forming process S260 according to the second embodiment, the punching process S264 and the rotating process S168 by the second punching device 102 are alternately performed in a state where the lower hole H1 is not formed. Thus, the holding hole 41b is formed. That is, the second embodiment corresponds to the comparative example described in the first embodiment.

  When the plate thickness T of the cylindrical portion 411 of the workpiece 410 is thin or the interval W between the adjacent holding holes 41b is large, for example, when the above-described formula (1) or formula (2) is not satisfied, the second implementation With the manufacturing method according to the embodiment, required specifications such as control responsiveness and hitting sound can be sufficiently satisfied.

  In the preparation step S <b> 100, the manufacturing apparatus 100 having the rotatable chuck 157, the die 62, and the punch 60 is prepared. In the attachment step S <b> 110, the bottomed cylindrical workpiece 410 having the bottom portion 419 and the cylinder portion 411 is attached to the chuck 157. In the holding hole forming step S260, the cylindrical portion 411 is punched out by the die hole 62a of the die 62S and the cutting edge portion 60a of the punch 60S while the bottom 419 of the work 410 is sandwiched between the chuck 157 and the die 62S. A plurality of holding holes 41b are formed in the cylindrical portion 411 of the workpiece 410 by alternately repeating the punching step S264 for forming the holding holes 41b of the roller 34 and the rotation step S168 for rotating the workpiece 410. .

  According to the second embodiment, the cylinder portion 411 is formed by the die hole 62a of the die 62S and the cutting edge portion 60a of the punch 60S in a state where the bottom portion 419 of the work 410 is sandwiched between the chuck 157 and the die 62S. Is punched from the outer diameter side to the inner diameter side to form the holding hole 41b of the roller 34, which is a rolling element, in the cylindrical portion 411. Thus, as in the first embodiment, the processing accuracy of the holding hole 41b is improved compared to the conventional case. it can.

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the above-described embodiment, the example in which the punch 60 is pressed against the workpiece 410 to interlock the operation of the punch 60 and the workpiece 410 to make the gap S zero is described, but the present invention is not limited to this. The workpiece 410 may be moved downward (in the −Z direction) by pressing the upper surface of the chuck unit 152 or the like, and the punching operation by the punch 60 may be performed after setting the gap S to zero.

(Modification 2)
In the above-described embodiment, the example in which the punch hole H1 and the holding hole 41b are formed by punching the punch 60 from the outer diameter side to the inner diameter side of the workpiece 410 has been described, but the present invention is not limited to this. When the workpiece 410 has a large inner diameter and a punch or punch holder can be disposed on the inner diameter side of the workpiece 410, the punch 60 may be punched from the inner diameter side toward the outer diameter side.

(Modification 3)
In the above-described embodiment, the example in which the coil spring 159c is employed as the elastic member that supports the chuck unit 152 so as to be movable in the Z direction has been described. However, the present invention is not limited to this. Similarly, although the example which employ | adopts the coil spring 67 as an elastic member which supports the punch holder 64 so that a movement to a Z direction was supported was demonstrated, this invention is not limited to this. In place of the coil spring, various elastic members such as a leaf spring can be employed.

(Modification 4)
In the above-described embodiment, the example in which the cutting edge portion of the die 62 is configured by the die hole 62a has been described, but the present invention is not limited to this. The cutting blade portion of the die 62 may be configured by a recess such as a groove corresponding to the cutting blade portion 60 a of the punch 60.

(Modification 5)
In the above-described embodiment, the example in which the retainer 94 is configured by the retaining cylinder 41 and the driven portion 9 has been described, but the present invention is not limited to this. What is necessary is just to have a bottomed cylindrical shape having a bottom portion to which the holding cylinder 41 provided with at least the holding hole 41b and the die 62 are pressed. Note that, as in the above-described embodiment, by forming the holding cylinder 41 and the driven portion 9 integrally, centering with the crankshaft is easy, and coaxial accuracy can be improved.

(Modification 6)
In the first embodiment, the example in which the bottom portion 419 of the workpiece 410 is punched while being sandwiched between the chuck 157 and the die 62 has been described, but the present invention is not limited to this. When the holding hole forming step S160 is performed after the pilot hole forming step S130 as in the first embodiment, the punch 60 is held in a state where the bottom portion 419 of the workpiece 410 is not sandwiched between the chuck 157 and the die 62. It is possible to form the holding hole 41b with higher accuracy than before by punching and performing the pilot hole processing and the shaving processing. In this case, the workpiece 410 can be configured with only the cylindrical portion 411 without providing the bottom portion 419 on the workpiece 410.

(Modification 7)
In the above-described embodiment, the method for manufacturing the retainer 94 for the variable valve timing control device has been described as an example, but the present invention is not limited to this. For example, the present invention can be applied to a rolling bearing retainer applied to machine tools, high-speed rolling mills, continuous casting equipment, construction machines, papermaking machines, industrial machines such as pumps and compressors, and the like.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

1 timing sprocket, 1a sprocket body, 1b gear part, 1c circular groove, 1d annular protrusion, 1e bolt insertion hole, 1f stopper convex part, 2 cam shaft, 2a flange part, 2b stopper concave groove, 2c opposing surface, 2d opposing surface 3 cover member, 3a cover body, 3b bracket, 3c bolt insertion hole, 3d ring part, 3e through hole, 4 phase change mechanism, 5 housing, 5a housing body, 5b bottom part, 5c shaft part insertion hole, 5d extension Portion, 6 female thread forming portion, 6a female screw hole, 7 bolt, 9 driven portion, 9a disk portion, 9b cylindrical portion, 9c step projection, 9d insertion hole, 10 cam bolt, 10a head portion, 10b shaft portion, 10c seat surface portion, 11 Sealing plate, 12 Electric motor, 13 Motor shaft, 14 Permanent magnet, 16 Stator, 17 Iron core 18 Electromagnetic coil 19 Ring member 19a Internal tooth 19b Bolt insertion hole 20 Commutator 21 Control unit 22 Resin holder 22a Screw 23 First brush 24 Second brush 28 Needle bearing 28a Retainer 28b Needle roller, 29 shaft insertion hole, 30 eccentric shaft part, 32 small diameter oil seal, 33 first ball bearing, 33a inner ring, 33b outer ring, 34 roller, 35 second ball bearing, 35a inner ring, 35b outer ring, 36 snap ring, 40 Chain cover, 41 Holding cylinder, 41b Holding hole, 41c Tip, 42 Timing chain, 43 Third ball bearing, 43a Inner ring, 43b Outer ring, 44 Space part, 45 Oil supply hole, 47 Bolt, 48 Slip ring, 49 Connector part, 49a Connector terminal, 50 Large-diameter oil seal, 50a Annular base part, 50b Annular seal part, 51 First cap, 52 Second cap, 54 X direction moving mechanism, 55 Y direction moving mechanism, 60 (60F, 60S) ) Punch, 60a Cutting edge part, 60b Inflow part, 60c Tip part, 60d Swelling part, 60f Outflow part, 62 (62F, 62S) Die, 62a Die hole, 62e End part, 64 Punch holder, 65 Press part, 66 Die holder, 68 guide post, 94 holder, 100 manufacturing device, 101 first punching device, 102 second punching device, 105 table, 108 work holding device, 150 tool support device, 150a fixing portion, 150b support portion, 152 Chuck unit, 157 Chuck, 157a Shaft, 157b Gripping part, 157c base part, 157d claw, 159 chuck support device, 159a fixing part, 159b support part, 410 work, 411 cylinder part, 415 mounting part, 419 bottom part

Claims (12)

A preparation step of preparing a manufacturing apparatus having a rotatable chuck, a first die and a first punch, and a second die and a second punch;
An attaching step of attaching a workpiece having a cylindrical tube portion to the chuck;
A punching process for punching the cylindrical part and forming a pilot hole in the cylindrical part by the cutting blade part of the first die and the cutting blade part of the first punch, and a rotating process for rotating the workpiece And by alternately repeating, a plurality of pilot hole forming steps for forming the plurality of pilot holes in the cylindrical portion of the workpiece,
The shaving process for forming the holding hole of the rolling element by shaving the lower hole by the cutting blade part of the second die and the cutting blade part of the second punch, and rotation for rotating the workpiece A holding hole forming step of forming a plurality of the holding holes in the cylindrical portion of the workpiece by alternately repeating the steps, and
The manufacturing method of the cage for rolling bearings provided with this. In the manufacturing method of the cage for rolling bearings of Claim 1,
A rolling bearing retainer manufacturing method comprising a step of shifting from the prepared hole forming step to the holding hole forming step in a state where the workpiece is held by the chuck. In the manufacturing method of the cage for rolling bearings of Claim 1,
The workpiece is a bottomed cylindrical shape having a bottom,
In the punching step, the cylindrical portion is formed by the cutting edge portion of the first die and the cutting edge portion of the first punch in a state where the bottom portion of the workpiece is sandwiched between the chuck and the first die. To form the prepared hole in the cylindrical portion,
In the shaving process, the lower hole is formed by the cutting blade portion of the second die and the cutting blade portion of the second punch in a state where the bottom portion of the workpiece is sandwiched between the chuck and the second die. A method for manufacturing a rolling bearing cage, in which the holding hole is formed by shaving the material. In the manufacturing method of the cage for rolling bearings of Claim 1,
The chuck is supported by a support device so as to be movable in a first direction perpendicular to the rotation axis direction of the chuck via a first elastic member,
In the punching step, the cylindrical portion is pressed to the first die by pressing the first punch against the cylindrical portion from a state where a gap is formed between the cylindrical portion and the first die. The first die die cutting blade portion and the first punch cutting blade portion to punch out the cylindrical portion to form the pilot hole in the cylindrical portion,
In the shaving process, the cylindrical portion is pressed against the cylindrical portion by pressing the second punch against the cylindrical portion from a state where a gap is formed between the cylindrical portion and the second die. A rolling bearing cage manufacturing method, wherein the holding hole is formed by shaving the lower hole with the cutting blade portion of the second die and the cutting blade portion of the second punch . A preparation step of preparing a manufacturing apparatus having a rotatable chuck, die and punch;
An attaching step for attaching a bottomed cylindrical workpiece having a bottom portion and a cylindrical portion to a chuck;
With the bottom part of the workpiece held between the chuck and the die, the cylindrical part is punched out by the cutting blade part of the die and the cutting blade part of the punch to form a holding hole for the rolling element in the cylindrical part. A holding hole forming step of forming a plurality of the holding holes in the cylindrical portion of the work by alternately repeating a punching process and a turning process of turning the work.
The manufacturing method of the cage for rolling bearings provided with this. In the manufacturing method of the cage for rolling bearings as described in any one of Claim 1-5,
The difference between the length of the short side of the holding hole in the outer peripheral portion of the cylindrical portion and the length of the short side of the holding hole in the inner peripheral portion of the cylindrical portion is 0 mm or more and 0.02 mm or less. A method for manufacturing a cage. In the manufacturing method of the cage for rolling bearings as described in any one of Claim 1-5,
The length of the said holding hole is a manufacturing method of the cage for rolling bearings which is 0.5 times or more of the length of the short side of the said holding hole. In the manufacturing method of the cage for rolling bearings as described in any one of Claim 1-5,
The method for manufacturing a rolling bearing cage, wherein an interval between the holding holes adjacent to each other in the circumferential direction of the cylindrical portion is not more than twice the length of the short side of the holding hole. In the manufacturing method of the cage for rolling bearings as described in any one of Claim 1-5,
The said workpiece | work consists of low carbon steel whose carbon amount is 0.2% or less, and the hardness after hardening is Hv653 or more, The manufacturing method of the cage for rolling bearings.   The manufacturing method of the valve timing control apparatus containing the manufacturing method of the cage for rolling bearings as described in any one of Claim 1-5. A chuck that can be rotated while holding a workpiece having a cylindrical portion, a chuck unit that holds the chuck, and a chuck unit that is movable in a first direction orthogonal to the rotation axis direction of the chuck. A work holding device having a first support device supported via one elastic member;
A first punching device and a second punching device which can be arranged opposite to each other in the rotation axis direction of the chuck;
A first moving mechanism for moving the chuck in the direction of the rotation axis, and a second perpendicular to the direction of the rotation axis and the first direction of the first punching device and the second punching device. A table having a second moving mechanism for moving in a direction,
The first punching device and the second punching device are respectively opposed to a punch arranged in parallel with the first direction, a punch holder for holding the punch, and a central axis direction of the punch. A die holder that holds the die, and a second support device that supports the punch holder via a second elastic member so as to be movable in the first direction,
An apparatus for manufacturing a rolling bearing retainer, wherein a punch size of the second punching device is larger than a punch size of the first punching device. A chuck that can be rotated while holding a bottomed cylindrical workpiece having a bottom portion and a cylindrical portion, a chuck unit that holds the chuck, and a first direction that is orthogonal to the rotation axis direction of the chuck. A work holding device having a first support device supported via a first elastic member so as to be movable
A punching device disposed opposite to the rotation axis of the chuck;
A table having a moving mechanism for moving the chuck toward the punching device,
The punching device is disposed to face a punch arranged in parallel with the first direction, a punch holder that holds the punch, and a central axis direction of the punch, and sandwiches a bottom portion of the workpiece with the chuck. A rolling bearing having a die, a die holder for holding the die, and a second support device for supporting the punch holder via a second elastic member so as to be movable in the first direction. Cage manufacturing equipment.

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