JP6237574B2 - Valve timing control device - Google Patents

Description

  The present invention relates to a valve opening / closing timing control device including a torsion spring that displaces a rotational phase of a driving side rotating body and a driven side rotating body in a predetermined direction by an urging force.

  As a valve opening / closing timing control device configured as described above, Patent Literature 1 urges a driven-side rotating body (internal rotor in the literature) in an advance direction with respect to a driving-side rotating body (external rotor in the literature). A technique with a torsion spring is shown.

  In this Patent Document 1, a cylindrical portion is formed on the front plate fixed to the front surface of the driving side rotating body, and a torsion spring is accommodated inside the cylindrical portion, and one end of the torsion spring is engaged with the front plate, The other end is engaged with the driven side rotating body. A spiral groove having a slope shape is formed on the inner surface of the cylindrical portion so that the first roll of the torsion spring contacts.

  Further, Patent Document 2 includes a drive side rotator (housing in the literature) and a driven side rotator (vane member in the document), a driven member provided with a support member, and a torsion spring supported by the support member. Technology to do is shown.

  In this Patent Document 2, a restricting portion for restricting the torsion spring from falling in the support member is disposed outside the front plate on the front side of the driving side rotating body, and the torsion spring is provided between the restricting portion and the front plate. The one end of the torsion spring is supported by the front plate, and the other end is supported by the restricting portion of the support member.

Japanese Patent Laid-Open No. 2003-247404 JP 2007-278305 A

  In the case where the torsion spring is provided in the accommodating space formed inside the valve opening / closing timing control device as in the configuration of Patent Document 1, a processing step is required to form the accommodating space, and this accommodating space is formed. This complicates the mold. For these reasons, the manufacturing cost is increased.

  Further, in the case where the torsion spring is provided in the accommodating space, the friction powder generated by the contact with the torsion spring during operation is likely to enter the inside of the apparatus.

  To deal with such inconvenience, as shown in Patent Document 2, a configuration in which a torsion spring is supported by a support member (hereinafter referred to as an urging unit) is a main body portion of a valve opening / closing timing control device (a drive side rotating body and a driven body). It is also possible to attach to the side rotating body).

  In the configuration in which the urging unit is attached to the main body part of the valve opening / closing timing control device in this way, the process of assembling the main body part and the process of assembling the urging unit can be performed separately, facilitating assembly. Moreover, since it is not necessary to form a space for accommodating the torsion spring inside the valve opening / closing timing control device, it is possible to reduce the cost and prevent the intrusion of friction powder into the device.

  In the configuration in which the urging unit is provided on the outer surface of the main part of the valve opening / closing timing control device, one end of the torsion spring is engaged with and supported by the driving-side rotating body, and the torsion spring is also appropriate from the viewpoint of suppressing vibration during rotation. It is also necessary to hold the position in a stable posture.

  However, in the configuration shown in Patent Document 2, since the base end portion of the torsion spring is wound around and supported by the three protrusions formed on the front plate, the front plate is likely to be complicated and there is room for improvement. is there.

  An object of the present invention is to constitute a valve timing control apparatus that stably supports a torsion spring with respect to an external position.

A feature of the present invention is that a driving side rotating body that rotates synchronously with a crankshaft of an internal combustion engine, a driven side rotating body that rotates integrally on the same rotation axis as a valve opening / closing camshaft,
A fluid pressure type phase control mechanism for displacing the relative rotational phase of these two rotating bodies in the advance direction or the retard direction;
An urging mechanism that applies an urging force between the two rotating bodies and displaces the relative rotation phase in a predetermined direction; and
A spring holder coupled to the driven side rotating body in a state in which the biasing mechanism protrudes along the rotation axis; a torsion spring that applies a biasing force across the spring holder and the driving side rotating body; Consisting of
The torsion spring includes a coil portion to be wound, a first arm that extends from one end of the coil portion and engages with the spring holder, and extends radially from the other end of the coil portion. A second arm that
On the outer wall of the drive-side rotator, a concave spring holding portion that supports an end portion of the torsion spring and a groove-like arm holding portion that holds the second arm are formed ,
The spring holder includes a seat portion fixed in a state of being fitted into a fitting recess formed in the driven side rotating body, and the seat portion is fitted with the fitting recess to perform positioning. An alignment portion and a plurality of protrusions protruding along the rotation axis;
A through-hole is formed at the center position of the front plate constituting the drive-side rotator, and the outer diameter of a circle connecting the outer circumferences of the plurality of protrusions around the rotation axis is smaller than the inner diameter of the through-hole, The outer end diameter of a circle connecting the plurality of alignment portions around the rotation axis is larger than the inner diameter of the through hole .

According to this configuration, the spring holder is connected to the driven side rotator, the coil portion of the torsion spring is disposed in the spring holder, and the first arm of the torsion spring is held by the spring holder. Further, a part of the torsion spring is fitted into a spring holding part formed in a concave shape on the outer wall of the driving side rotating body, and the second arm of the torsion spring is fitted to a groove-like arm holding part formed on the outer wall of the driving side rotating body. Fit. Since the holding portion can fit the second arm in the radial direction, the holding state of the torsion spring can be shortened along the direction of the rotation axis.
As a result, a valve opening / closing timing control device capable of stably supporting the torsion spring with respect to the external position has been configured. In particular, since the second arm portion extends in the radial direction, for example, a hole for holding the second arm portion on the driving side rotating body as in a configuration in which the second arm portion protrudes in a direction along the rotation axis. There is no need to form a portion, and the enlargement of the dimension in the direction of the rotation axis of the drive-side rotator is suppressed, and as a result, the apparatus is reduced in size.

  In the present invention, the spring holding portion may be formed in a spiral shape so as to follow the shape of the end portion of the coil portion of the torsion spring.

  According to this, by inserting a part of the torsion spring into the spring holding portion, it is possible to arrange the torsion spring in a posture in which the axis of the coil portion coincides with the rotation axis. Further, the amount of protrusion of the torsion spring in the direction of the rotation axis can be reduced. As a result, the position of the center of gravity of the torsion spring is disposed on the rotation axis, and vibration during rotation can be suppressed. Furthermore, since the coil portion of the torsion spring contacts the inclined surface of the spring holding portion on a wide surface, it is possible to reduce wear caused by local contact.

  In the present invention, the spring holding portion may be configured to hold a portion of one end or less of the end portion of the torsion spring.

  According to this, the displacement of the torsion spring in any direction around the rotation axis can be suppressed, and other parts of the torsion spring need not be brought into contact with the components of the device. This reduces the wear caused by contact with the torsion spring.

It is sectional drawing of a valve opening / closing timing control apparatus. It is the II-II sectional view taken on the line of FIG. It is a figure which shows the positional relationship of an urging | biasing unit and a front plate. It is sectional drawing of a disassembled state with an urging | biasing unit with a front plate. It is a disassembled perspective view of a valve opening / closing timing control device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIGS. 1 and 2, the external rotor 20 as the driving side rotating body, the internal rotor 30 as the driven side rotating body, and the relative rotational phase of the external rotor 20 and the internal rotor 30 are biased in the advance direction. The valve opening / closing timing control device A is configured to include an urging unit 40 as an urging mechanism and an electromagnetic control valve 50.

  The external rotor 20 (an example of a drive side rotator) is linked via a timing belt 7 so as to rotate synchronously with the crankshaft 1 of the engine E as an internal combustion engine, and is connected to the rotation axis X of the intake camshaft 5. It is arranged on the coaxial core. The internal rotor (driven rotor) is disposed on the same axis as the rotational axis X, and is included in the external rotor 20 so as to be integrally rotated with the intake camshaft 5.

  This valve opening / closing timing control device A includes an electromagnetic control valve 50 coaxially with the rotation axis X of the internal rotor 30. The valve opening / closing timing control device A changes the relative rotation phase between the external rotor 20 and the internal rotor 30 by controlling the hydraulic oil (an example of fluid) by the electromagnetic control valve 50, thereby controlling the opening / closing timing of the intake valve 5V. Do. The external rotor 20 and the internal rotor 30 function as a phase control mechanism.

  The engine E (an example of an internal combustion engine) is provided in a vehicle such as a passenger car. This engine E includes a crankshaft 1 at the lower part, a piston 3 is accommodated in a cylinder bore formed in an upper cylinder block 2, and the piston 3 and the crankshaft 1 are connected by a connecting rod 4. It is configured.

  As a transmission configuration for transmitting the rotational force of the crankshaft 1 to the valve opening / closing timing control device A, a timing chain may be used, or a configuration for transmitting the driving force of the crankshaft 1 by a gear train having a large number of gears may be used.

  Further, an upper portion of the engine E includes an intake camshaft 5 and an exhaust camshaft, and a hydraulic pump P that is driven by the driving force of the crankshaft 1. The intake camshaft 5 opens and closes the intake valve 5V by rotation. The hydraulic pump P supplies the lubricating oil stored in the oil pan of the engine E to the electromagnetic control valve 50 as hydraulic oil (an example of fluid) via the supply flow path 8.

  By winding the timing belt 7 over the output pulley 6 formed on the crankshaft 1 of the engine E and the timing pulley 23P, the external rotor 20 rotates synchronously with the crankshaft 1. Although not shown in the drawing, a timing pulley is also provided at the front end of the camshaft on the exhaust side, and a timing belt 7 is wound around this.

  In this embodiment, the intake camshaft 5 is provided with the valve opening / closing timing control device A. However, the valve opening / closing timing control device A is provided on the exhaust camshaft, and both the intake camshaft 5 and the exhaust camshaft are provided. You may be prepared for.

  As shown in FIG. 2, in the valve opening / closing timing control device A, the external rotor 20 rotates in the driving rotation direction S by the driving force from the crankshaft 1. The direction in which the inner rotor 30 rotates relative to the outer rotor 20 in the same direction as the driving rotation direction S is referred to as an advance angle direction Sa, and the opposite direction is referred to as a retard angle direction Sb.

[Valve opening / closing timing control device]
The valve opening / closing timing control device A includes an external rotor 20 and an internal rotor 30 as shown in FIGS. 1, 2, and 5, and has a bush shape at a position sandwiched between the internal rotor 30 and the intake camshaft 5. Adapter 37 is provided.

  The external rotor 20 includes an external rotor main body 21, a front plate 22, and a rear plate 23, which are integrated by fastening a plurality of fastening bolts 24. A timing pulley 23 </ b> P is formed on the outer periphery of the rear plate 23.

  An internal rotor 30 is disposed at a position sandwiched between the front plate 22 and the rear plate 23. The outer rotor main body 21 is integrally formed with a plurality of partition portions 21T that protrude inward in the radial direction with respect to the rotation axis X.

  The inner rotor 30 protrudes on the outer periphery of the inner rotor body 31 so as to come into contact with the cylindrical inner rotor body 31 that is in close contact with the protruding end of the partition portion 21T of the outer rotor body 21 and the inner peripheral surface of the outer rotor body 21. And a plurality of (four) vane portions 32 provided.

  As a result, a plurality of fluid pressure chambers C are formed on the outer peripheral side of the inner rotor body 31 at an intermediate position between the partition portions 21T adjacent in the rotation direction. These fluid pressure chambers C are partitioned by the vane portion 32 to form the advance chamber Ca and the retard chamber Cb.

  Further, the connecting bolt 38 is formed with a bolt head portion 38H and a male screw portion 38S. The male screw portion 38S is screwed into the female screw portion of the intake camshaft 5, whereby the internal rotor 30 is connected to the intake camshaft 5. Connected. In particular, at the time of this connection, the adapter 37, the internal rotor 30, and the seat portion 42 of the spring holder 41 are integrated with each other between the bolt head 38 </ b> H and the intake camshaft 5.

  The connecting bolt 38 is formed in a cylindrical shape centered on the rotational axis X, and the spool 51 of the electromagnetic control valve 50 and a spool spring that biases the spool 51 in the projecting direction are accommodated in this internal space. The configuration of the electromagnetic control valve 50 will be described later.

  This valve opening / closing timing control device A includes a lock mechanism L that locks (fixes) the relative rotational phase between the external rotor 20 and the internal rotor 30 as a phase control mechanism to the most retarded phase. The lock mechanism L includes a lock member 25 that is guided in a guide hole 26 formed in a posture along the rotation axis X with respect to one vane portion 32, and a lock that projects and biases the lock member 25. A spring and a lock recess formed in the rear plate 23 are provided.

  When the engine E is operating, the variable torque acting from the intake camshaft 5 acts in the retarding direction Sb. For this reason, the urging direction of the urging unit 40 is set so as to be displaced in the advance direction Sa with respect to the internal rotor 30 so as to suppress the action of the varying torque. The configuration of the urging unit 40 will be described later.

[Valve opening / closing timing control device: oil passage configuration]
The space in which the relative rotational phase is displaced in the advance direction Sa by the supply of hydraulic oil is the advance chamber Ca. Conversely, the space in which the relative rotational phase is displaced in the retard direction Sb by the supply of hydraulic oil is delayed. This is the corner chamber Cb. The relative rotational phase in a state in which the vane portion 32 has reached the operating end in the advance angle direction Sa (including the phase near the operation end of the vane portion 32 in the advance angle direction Sa) is referred to as the most advanced angle phase. The relative rotational phase in a state in which reaches the operating end in the retarding direction Sb (including the phase near the operating end of the vane portion 32 in the retarding direction Sb) is referred to as the most retarded phase.

  The internal rotor main body 31 is formed with a retarding passage 33 that communicates with the retarding chamber Cb and an advance passage 34 that communicates with the advance chamber Ca. The advance channel 34 communicates with the lock recess.

  In this valve opening / closing timing control device A, when hydraulic oil is supplied to the advance chamber Ca with the lock mechanism L in the locked state, the hydraulic oil is supplied from the advance passage 34 to the lock recess. Thus, the lock member 25 is released from the lock recess against the urging force of the lock spring, and the locked state is released.

[Electromagnetic control valve / oil path configuration]
As shown in FIG. 1, the electromagnetic control valve 50 includes a spool 51, a spool spring, and an electromagnetic solenoid 54. In other words, the spool 51 is slidably arranged in the inner space of the connecting bolt 38 in the direction along the rotation axis X, and the connecting bolt 38 has a stopper formed of a retaining ring for determining the operation position on the outer end side of the spool 51. 53 is provided. Further, the spool spring exerts an urging force in a direction (protruding direction) in which the spool 51 is separated from the intake camshaft 5.

  The electromagnetic solenoid 54 includes a plunger 54a that protrudes and operates by an amount proportional to the electric power supplied to the internal solenoid, and operates the spool 51 by the pressing force of the plunger 54a. Further, the spool 51 rotates integrally with the internal rotor 30, and the electromagnetic solenoid 54 becomes non-rotatable by being supported by the engine E.

  The electromagnetic solenoid 54 is disposed at a position where the plunger 54a can be brought into contact with the outer end of the spool 51, and is held in a non-pressing position in a non-energized state, and the spool 51 is held in a retard position. Further, in a state where a predetermined power is supplied to the electromagnetic solenoid 54, the plunger 54a reaches the inner end side pressing position, and the spool 51 is held at the advance position. Further, by energizing the electromagnetic solenoid 54 with power lower than the power set for the advance angle position, the protruding amount of the plunger 54a is limited, and the spool 51 is neutral between the advance position and the retard position. Held in position.

  In addition, a flow passage for controlling the fluid from the hydraulic pump P and supplying it to either the retard flow passage 33 or the advance flow passage 34 is formed inside the connecting bolt 38 by the position of the spool 51. Has been. Therefore, for example, when the spool 51 is operated to the retard position by the electromagnetic solenoid 54, then to the neutral position, and further to the advance position, the hydraulic pump P is correspondingly operated. A state in which the hydraulic oil is supplied to the retard chamber Cb, a state in which the hydraulic oil is not supplied and discharged, and a state in which the hydraulic oil is supplied to the advance chamber Ca are created in this order.

[Valve opening / closing timing control device: Energizing unit]
As shown in FIGS. 1 and 3 to 5, the urging unit 40 includes a spring holder 41 and a torsion spring 46 supported by the spring holder 41.

  The spring holder 41 is integrally formed with a seat portion 42 connected to the inner rotor main body 31 and a plurality (three in the embodiment) of projecting portions 43 formed in a posture projecting from the seat portion 42 along the rotation axis X. Is formed. Note that the spring holder 41 may not include the seat portion 42. A member that is connected to the rotor body 31 and protrudes along the rotation axis X can also be used as the protrusion 43.

  An insertion hole 42A through which the fastening bolt 24 is inserted is formed at the center position of the seat portion 42. A centering portion 44 is formed in the circumferential direction of the outer periphery of the seat portion 42 in the middle of the projecting portion 43 so as to project outward, and one of a plurality (three in the embodiment) of the centering portions 44 is formed. Further, a rotation restricting portion 44A that protrudes outward from the outer end is formed.

  The spring holder 41 is manufactured by pressing a metal plate, and the seat portion 42, the plurality of alignment portions 44, and the rotation restricting portion 44A are in a posture orthogonal to the rotation axis X. Arranged on the same virtual plane. Further, each of the plurality of projecting portions 43 is formed to have a set width, and is formed in an arc shape so that the outer peripheral surface thereof is arranged on a circumference centering on the rotation axis X. Further, in order to facilitate the bending of the protruding portion 43 in the press working, a notch in which a boundary portion between the base end portion of the protruding portion 43 and the base end portion of the alignment portion 44 is cut out in the direction of the seat portion 42. A portion 42B is formed.

  A first engaging portion 43A (an example of an engaging support portion) that is a concave shape cut in the circumferential direction is formed on one side edge of the plurality of projecting portions 43. With the plurality of alignment portions 44 fitted in the fitting recess 31A of the inner rotor main body 31, the outer edge 44E of each alignment portion 44 contacts the circular inner peripheral surface 31AE of the fitting recess 31A. Position it in contact. In order to realize this positioning, a virtual outer circumference circle connecting each outer end edge 44E is formed in an arc shape along the circumference of a circle centering on the rotation axis X. As will be described later, the diameter of the virtual outer circumference circle is the outer end diameter D3. In this configuration, in a state where the alignment portion 44 is fitted in the fitting recess 31A, the relative rotation is allowed, and the rotation restricting portion 44A is fitted in the restricting recess 31B. Each rotation is restricted.

  The torsion spring 46 is disposed in a region surrounding the spring holder 41, and is wound around a coil portion 46A and a first arm 46B extending outward from an outer end position in the direction along the rotation axis X at the coil portion 46A. (One end) and a second arm 46C (the other end) extending radially outward from the outer end position. Note that the coil portion 46 </ b> A may be disposed inside a space defined by the protruding portion 43.

  As shown in FIG. 5, at the center position of the front plate 22, there is an inner diameter that is slightly larger than the outer peripheral diameter D <b> 2 of the plurality of projecting portions 43 and has a hole diameter D <b> 1 (inner diameter) centered on the rotational axis X. A hole 22A is formed. A virtual outer peripheral edge connecting the outer peripheries of the plurality of protrusions 43 as viewed in the direction along the rotation axis X is the outer peripheral diameter D2. The inner diameter of the coil portion 46A of the torsion spring 46 is set to a value sufficiently larger than the outer peripheral diameter D2.

  The outer end diameter D3 of the virtual outer periphery connecting the outer ends of the plurality of alignment portions 44 as viewed along the rotation axis X is set to be larger than the hole diameter D1. Further, the inner peripheral diameter D4 of the fitting recess 31A of the inner rotor body 31 is set to a value slightly larger than the outer end diameter D3. Thereby, the protrusion part 43 with the outer peripheral diameter D2 can be inserted into the through hole 22A with the hole diameter D1. Further, the alignment portion 44 having an outer end diameter D3 larger than the hole diameter D1 of the through hole 22A is held in a state of being prevented from coming off from the front plate 22. Further, the alignment portion 44 having the outer end diameter D3 can be fitted into the fitting recess 31A having the inner peripheral diameter D4.

  A concave spring holding portion 22B into which a part of the inner end position of the coil portion 46A of the torsion spring 46 is fitted is formed in a circumferential region surrounding the through hole 22A with the outer wall of the front plate 22. A second engaging portion 22C (an example of an arm holding portion) that is continuous in a groove shape from the spring holding portion 22B to the outside is formed at a position that is continuous with the spring holding portion 22B.

  As shown in FIG. 4, the spring holding portion 22 </ b> B is formed in a spiral shape so as to follow the shape of the end portion of the coil portion 46 </ b> A of the torsion spring 46. That is, the spring holding portion 22B is formed on an inclined surface that is inclined with respect to a virtual plane orthogonal to the rotation axis X. Since the spring holding portion 22B is formed in an inclined posture in this way, the depth of the spring holding portion 22B (value in the direction along the rotation axis X) is not a constant value, but the spring holding portion 22B The depth is set so as to accommodate one turn of the torsion spring 46.

  By limiting the depth of the spring holding portion 22B in this way, an increase in the thickness of the front plate 22 is limited, and an increase in the size of the valve opening / closing timing control device A is suppressed. As the torsion spring 46, it is possible to use a wire having a circular cross section.

  A fitting recess 31 </ b> A is formed in such a manner that a region around the rotation axis X is recessed with respect to the outer end surface on the front plate side of the inner rotor body 31. The fitting recess 31 </ b> A is formed in a circular shape having an inner peripheral surface 31 </ b> AE with the rotation axis X as the center. As described above, the inner peripheral diameter D4 of the fitting concave portion 31A is set to a value slightly larger than the outer end diameter D3 of the virtual outer peripheral edge connecting the outer ends of the plurality of alignment portions 44, and a part of the outer periphery thereof is set. A concave regulating recess 31B is formed.

  The seat portion 42 and the alignment portion 44 of the spring holder 41 are fitted into the fitting recess 31A, and the rotation restricting portion 44A is fitted into the restricting recess 31B. The depth of the fitting recess 31 </ b> A and the regulation recess 31 </ b> B is set to a value that matches the thickness of the alignment portion 44 of the spring holder 41. As a result, when the front plate 22 is connected to the external rotor main body 21 by the plurality of fastening bolts 24, the outer periphery of the through hole 22 </ b> A of the front plate 22 is pressed down on the alignment portion 44 of the spring holder 41 so as to prevent it from coming off.

  Note that the restriction recess 31B may be formed at a plurality of locations of the fitting recess 31A. Further, in order to restrict the relative rotation between the spring holder 41 and the inner rotor 30, a concave portion on the outer periphery of the alignment portion 44 is formed, and a convex portion to be fitted to this is formed on the inner periphery of the fitting concave portion 31A. Also good. Since the restricting recess 31B is formed in the radial direction as described above, the thickness of the internal rotor 30 is not increased as compared with, for example, a hole formed along the rotation axis X.

[Assembly of the urging unit]
The rear plate 23 is disposed on the back of the outer rotor main body 21, the inner rotor main body 31 is fitted therein, and the spool 51 and the like are accommodated inside the connecting bolt 38.

  Next, the protrusions 43 of the spring holder 41 are inserted into the through holes 22 </ b> A of the front plate 22 from the back side, and the torsion springs 46 are disposed so as to surround the plurality of protrusions 43.

  When the torsion spring 46 is arranged in this way, a part of the coil portion 46A is fitted into the spring holding portion 22B of the front plate 22, and the second arm 46C of the torsion spring 46 is fitted into the second engagement portion 22C. Further, the first arm 46 </ b> B of the torsion spring 46 is engaged with and held by the first engaging portion 43 </ b> A of the protruding portion 43.

  Next, the alignment portion 44 of the spring holder 41 is fitted into the fitting recess 31A of the inner rotor body 31, and the rotation restricting portion 44A is fitted into the restricting recess 31B. Thereby, the outer end edges 44E of the plurality of alignment portions 44 come into contact with the circumferential inner peripheral surface 31AE of the fitting recess 31A, and the center of gravity of the spring holder 41 is held at the position of the rotation axis X. Positioning is performed. Thereby, the internal rotor main body 31 and the spring holder 41 reach a state in which they can rotate integrally.

  Next, the front plate 22 is overlaid on the outer rotor main body 21 and connected by fastening bolts 24. Further, the connecting bolt 38 is inserted into the insertion hole 42 </ b> A of the seat 42 of the spring holder 41, and the male screw portion 38 </ b> S of the connecting bolt 38 is screwed into the female screw portion of the intake camshaft 5 for fastening.

  Thereby, the intake camshaft 5, the internal rotor 30, and the spring holder 41 are integrated, and the valve opening / closing timing control device A is completed. In this completed state, the outer periphery of the through hole 22A of the front plate 22 presses the alignment portion 44 of the spring holder 41, and the spring holder 41 is prevented from being lifted.

  In this completed state, the torsion spring 46 of the urging unit 40 applies an urging force that displaces the inner rotor 30 in the advance angle direction Sa to the outer rotor 20. In addition, a portion of the coil portion 46A of the torsion spring 46 that is adjacent to the front plate 22 is fitted into the spring holding portion 22B in an inclined posture, so that the axis of the coil portion 46A of the torsion spring 46 is turned into the rotation axis X. The torsion spring 46 can be supported in a state in which the torsion spring 46 is matched. Furthermore, since the inner periphery of the coil portion 46A of the torsion spring 46 is disposed at a position separated from the outer periphery of the protrusion 43, there is no resistance between them when the relative rotational phase changes, and the protrusion 43 It does not wear the outer periphery of the.

[Operation / Effect of Embodiment]
In the configuration in which the urging unit 40 protrudes from the main body portion (phase control mechanism) of the valve opening / closing timing control device A, it is important that the position of the center of gravity of the urging unit 40 coincides with the rotation axis X during rotation. In response to this problem, when the spring holder 41 is attached to the inner rotor body 31 as in the present invention, the alignment portion 44 is fitted into the fitting recess 31A of the inner rotor body 31 for positioning. Thus, the center of gravity of the spring holder 41 can be arranged on the coaxial axis with the rotational axis X. Further, the spring holder 41 can be rotated integrally with the internal rotor 30 only by fitting the rotation restricting portion 44 </ b> A of the spring holder 41.

  Compared with the case where the spring holder 41 is fixed to the inner rotor 30 by press-fitting, the inner rotor 30 is not deformed, and the sliding resistance is not increased due to the deformation during the press-fitting. Further, for example, in a case where one end of the torsion spring 46 is directly engaged with the outer rotor 20 or the inner rotor 30, it is necessary to increase the strength of the engaging portion. On the other hand, by using the spring holder 41, it is not necessary to increase the strength of either of the rotors, and there is no wear at the portion where the spring is engaged.

  As in the present invention, the inner end side of the coil portion 46 </ b> A of the torsion spring 46 in the direction of the rotation axis X is supported by being fitted into the spring holding portion 22 </ b> B in the inclined posture of the front plate 22. Thereby, the axial center position of the coil part 46A of the torsion spring 46 is made to coincide with the rotational axis X, and the torsion spring 46 is not vibrated during rotation. Further, since a part of the coil portion 46A of the torsion spring 46 comes into contact with the inclined surface of the spring holding portion 22B on a wide surface, it is possible to reduce wear caused by local contact.

  Since the hole diameter D1 of the through hole 22A of the front plate 22 is smaller than the outer end diameter D3 of the plurality of alignment portions 44, the spring holder 41 is pressed by the front plate 22 to prevent the spring holder from being lifted.

  In the valve opening / closing timing control apparatus A having this configuration, the hydraulic oil leaks between the external rotor 20 and the internal rotor 30, and the leaked hydraulic oil flows from the through hole 22 </ b> A of the front plate 22 to the outside. By taking out, hydraulic oil can be supplied between the torsion spring 46 and the spring holding part 22B, and wear of the spring holding part 22B can be suppressed.

  INDUSTRIAL APPLICABILITY The present invention can be used for a valve opening / closing timing control device including a mechanism that biases the relative rotation phase between a driving side rotating body and a driven side rotating body in a predetermined direction.

1 Crankshaft 5 Camshaft (Intake camshaft)
20 Drive-side rotating body (external rotor)
22B Spring holding portion 22C Arm holding portion (second engaging portion)
30 Driven side rotating body (internal rotor)
40 Energizing mechanism (energizing unit)
41 Spring holder 43A 1st engagement part 46 Torsion spring 46A Coil part 46B 1st arm 46C 2nd arm E Internal combustion engine (engine)
Sa advance angle direction Sb retard angle direction X rotation axis

Claims (3)

A drive-side rotator that rotates synchronously with the crankshaft of the internal combustion engine, a driven-side rotator that integrally rotates on the same rotation axis as the camshaft for opening and closing the valve,
A fluid pressure type phase control mechanism for displacing the relative rotational phase of these two rotating bodies in the advance direction or the retard direction;
An urging mechanism that applies an urging force between the two rotating bodies and displaces the relative rotation phase in a predetermined direction; and
A spring holder coupled to the driven side rotating body in a state in which the biasing mechanism protrudes along the rotation axis; a torsion spring that applies a biasing force across the spring holder and the driving side rotating body; Consists of
The torsion spring includes a coil portion to be wound, a first arm that extends from one end of the coil portion and engages with the spring holder, and extends radially from the other end of the coil portion. A second arm that
On the outer wall of the drive-side rotator, a concave spring holding portion that supports an end portion of the torsion spring and a groove-like arm holding portion that holds the second arm are formed ,
The spring holder includes a seat portion fixed in a state of being fitted into a fitting recess formed in the driven side rotating body, and the seat portion is fitted with the fitting recess to perform positioning. An alignment portion and a plurality of protrusions protruding along the rotation axis;
A through-hole is formed at the center position of the front plate constituting the drive-side rotator, and the outer diameter of a circle connecting the outer circumferences of the plurality of protrusions around the rotation axis is smaller than the inner diameter of the through-hole, A valve opening / closing timing control device in which an outer end diameter of a circle connecting the plurality of alignment portions around a rotation axis is larger than an inner diameter of the through hole .   The valve opening / closing timing control device according to claim 1, wherein the spring holding portion is formed in a spiral shape so as to follow a shape of an end portion of the coil portion of the torsion spring.   3. The valve opening / closing timing control device according to claim 1, wherein the spring holding portion has a shape that holds a portion of one end or less of the end portion of the torsion spring.

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