JP2015102065A - Valve opening/closing timing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a valve opening/closing timing control device having a simple configuration to maintain meshing of gears of a differential-type speed reduction mechanism, thereby facilitating assembling of the same.SOLUTION: In the valve opening/closing timing control device, a ring gear 21 and an inner gear 22 constituting the differential-type speed reduction mechanism are configured to be tapered gears in which directions of their tooth traces of tooth parts are mutually inclined in the same direction based on a rotating axis X. The ring gear 21 and the inner gear 22 are urged by an urging member 25 in a direction along the rotating axis X so that the tooth part 21A of the ring gear 21 meshes with the tooth part 22A of the inner gear 22.

Description

  The present invention relates to a valve opening / closing timing control device, and more specifically, a drive-side rotator that rotates synchronously with a crankshaft, and is rotated integrally with one of an intake camshaft or an exhaust camshaft that is rotatably supported relative to the drive-side rotator. The present invention relates to a technique for changing a relative rotation phase with a driven rotating body to be driven by a driving force of an electric actuator.

  As a valve opening / closing timing control device configured as described above, Patent Document 1 discloses a relative rotation around a central axis between a driving side rotating body (in the literature, an input member) and a driven side rotating body (in the literature, an output member). A technique is provided that includes a planetary that is freely provided and sets a relative rotational phase between a driving side rotating body and a driven side rotating body by an electric motor.

  In Patent Document 1, a carrier is supported so as to be rotatable around a central axis with respect to a driving side rotating body, and a planetary is supported so as to be relatively rotatable with respect to the carrier at a position eccentric from the central axis. A driving gear is formed on the inner periphery of the driving side rotating body, and a driven gear having a smaller diameter than the driving gear is formed on the inner periphery of the driven side rotating body.

  The planetary is integrally formed with a first gear having a smaller number of teeth than the drive gear and a second gear having a smaller number of teeth than the driven gear, and the planetary is disposed at the eccentric position. A part of the gear meshes with the drive gear, and a part of the second gear meshes with the driven gear.

  Moreover, in this patent document 1, by providing a leaf spring as an elastic member between the carrier and the planetary, the planetary is pushed in the eccentric direction, the first gear and the drive gear are engaged, and the second gear and the driven are driven. Engagement with the gear is ensured.

JP 2012-92721 A

  The valve opening / closing timing control device described in Patent Document 1 is configured such that a combination of a first gear and a driving gear and a combination of a second gear and a driven gear are configured as a two-stage hypocycloid reduction mechanism. There is a high deceleration rate.

  Further, in the valve opening / closing timing control device described in Patent Document 1, in order to ensure that the first gear and the drive gear mesh with each other and the second gear and the driven gear mesh with each other, a part of the carrier is used. A space for accommodating the leaf spring is formed by processing such as notching.

  Thus, in the configuration in which the space for accommodating the leaf spring is formed in the carrier, not only the step of processing the carrier is required, but also the step of inserting the leaf spring into the space formed in the carrier is required. There is room for improvement. In particular, in the step of inserting the leaf spring, the leaf spring that has been elastically deformed by applying an external force is inserted into a relatively small space, so that high operating accuracy is required for the device that realizes this step.

  An object of the present invention is to obtain a valve opening / closing timing control device that is simple in structure and easy to assemble, and that maintains the meshing of a gear of a differential reduction mechanism constituted by one stage.

  A feature of the present invention is that a drive-side rotating body that rotates synchronously with a crankshaft around a rotation axis, and an intake camshaft or exhaust that is supported so as to be rotatable relative to the drive-side rotation body about the rotation axis. A driven-side rotating body that rotates integrally with at least one of the camshafts, and a gear-type phase adjusting mechanism that sets a relative rotational phase of the driving-side rotating body and the driven-side rotating body by a driving force of an electric actuator. The phase adjusting mechanism includes a ring gear arranged on the coaxial axis with the rotary shaft core, an eccentric shaft core in an attitude parallel to the rotary shaft core, and an inner gear arranged on the coaxial core, and the ring gear of the ring gear A part of the inner gear tooth part is meshed with a part of the inner peripheral tooth part, and the position of the eccentric shaft core is revolved around the rotating shaft core by the driving force of the electric actuator. Thus, a differential reduction mechanism that rotates the inner gear relative to the ring gear by an angle corresponding to the difference between the number of teeth of the ring gear and the number of teeth of the inner gear, and the ring gear and the inner gear are The toothed portions of the respective tooth portions are inclined in the same direction with respect to the rotating shaft core, and the tooth portions of the ring gear and the inner gear teeth portion are arranged in a direction along the rotating shaft core. An urging member is provided that applies an urging force that is relatively close to at least one of the ring gear and the inner gear.

According to this configuration, the ring gear and the inner gear have a shape having tapered portions in which the tooth streak directions of the respective tooth portions are inclined in the same direction with respect to the rotation axis, and the teeth of the ring gear and the inner gear The urging member causes the urging force to relatively move the portion in the direction along the rotation axis. From this configuration, when the urging force from the urging member acts, the tooth portion of the ring gear and the tooth portion of the inner gear are relatively displaced in the direction of deep engagement, and a good engagement state can be maintained.
That is, in this configuration, it is only necessary to provide a compression coil spring, a disc spring or the like in order to make the ring gear and the inner gear relatively close to each other in the direction along the rotation axis. Processing to form a space for inserting the urging member is not required.
Therefore, a valve opening / closing timing control device that has a simple structure for maintaining the meshing of the gear of the differential reduction mechanism constituted by one stage and is easy to assemble is obtained.

  The present invention includes a rotating member that rotates about the rotating shaft center by a driving force of the electric actuator, and that has a cylindrical eccentric portion that is formed integrally with the eccentric shaft center. The inner gear is supported to be non-rotatable with respect to the driving side rotating body, the inner gear is supported to be rotatable with respect to the eccentric portion, and is displaceable in a direction along the eccentric shaft core, and the biasing member is configured to support the inner gear. A biasing force that is displaced in a direction along the eccentric shaft core may be applied.

  According to this, the inner gear is displaced in the direction along the eccentric shaft core by the urging force of the urging member. Due to this displacement, the teeth of the inner gear mesh with the teeth of the ring gear, and this meshing state can be maintained.

  The present invention includes a rotating member that rotates about the rotating shaft center by a driving force of the electric actuator, and that has a cylindrical eccentric portion that is formed integrally with the eccentric shaft center. It is non-rotatable with respect to the drive-side rotator, and is supported so as to be displaceable in a direction along the rotation axis, the inner gear is supported so as to be rotatable with respect to the eccentric portion, and the biasing member is An urging force for displacing the ring gear in a direction along the rotation axis may be applied.

  According to this, the ring gear is displaced in the direction along the rotational axis by the urging force of the urging member. Due to this displacement, the teeth of the inner gear mesh with the teeth of the ring gear, and this meshing state can be maintained.

  In the present invention, the teeth of the inner gear may be crowned.

  According to this, noise is suppressed when the tooth part of the ring gear and the tooth part of the inner gear are engaged, and a good meshing state is maintained even if the rotating shaft core and the eccentric shaft core are not maintained in a parallel posture with high accuracy.

  In the present invention, the tooth shapes of the tooth portions of the ring gear and the inner gear may be formed in a trochoid shape.

  The trochoidal tooth profile can be designed with a smaller tooth thickness with respect to the tooth height than the cycloid tooth profile. Accordingly, by forming the tooth shapes of the tooth portions of the ring gear and the inner gear into a trochoid shape, it is possible to suppress an increase in the diameter of the ring gear and the inner gear while obtaining a large reduction ratio.

It is sectional drawing which shows the structure of a valve opening / closing timing control apparatus. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a figure which shows the tooth surface shape of a ring gear. It is a disassembled perspective view of a valve opening / closing timing control device. It is sectional drawing which shows the structure of the valve opening / closing timing control apparatus of another embodiment (a). It is sectional drawing which shows the structure of the valve opening / closing timing control apparatus of another embodiment (b).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 1, a driving side rotating body A that rotates synchronously with a crankshaft 1 of an engine E as an internal combustion engine and a driven side rotating body B that is connected to an intake camshaft 2 of the engine E are provided. A valve opening / closing timing control device is configured to include a phase adjusting mechanism C that sets a relative rotational phase between the rotating body A and the driven-side rotating body B.

  An engine E (an example of an internal combustion engine) accommodates a piston 4 in a slidable manner with respect to a plurality of cylinder bores formed in a cylinder block, and connects the piston 4 to a crankshaft 1 by a connecting rod 5 to form a four-cycle type. It is configured. The engine E is assumed to be provided in a vehicle such as a passenger car, but may be provided in a vehicle other than the passenger car.

  The valve opening / closing timing control device of the present invention does not control only the intake camshaft 2 that opens and closes the intake valve Va, but may control the exhaust valve, and controls the intake valve Va and the exhaust valve. It is also good.

  In this valve opening / closing timing control device, the timing chain 6 is wound around the output sprocket 1S of the crankshaft 1 and the drive sprocket 11S formed on the outer periphery of the drive side rotator A, whereby the entire device is connected to the crankshaft 1. Rotate synchronously. Further, the phase adjusting mechanism C sets the relative rotation phase of the driven side rotating body B with respect to the driving side rotating body A by the driving force of the electric motor M as an electric actuator. Adjustment of the opening / closing timing of the intake valve Va is realized by setting the relative rotation phase. The electric motor M is supported on the engine E by the support frame 7.

  In this engine E, a timing belt may be used in place of the timing chain 6, and a configuration in which the driving force of the crankshaft 1 is transmitted to the driving side rotating body A by a gear train having a large number of gears may be adopted.

[Valve opening / closing timing control device]
As shown in FIGS. 1 to 5, the valve timing control apparatus includes a rear case 11 in which a drive sprocket 11 </ b> S is formed as a drive-side rotator A, and a front case 12 formed in a bowl shape. Is provided with a phase adjusting mechanism C configured as a differential speed reducing mechanism, a linkage mechanism D, and a driven plate 31 as a driven side rotating body B connected to the intake camshaft 2.

  The drive-side rotator A and the driven-side rotator B (driven plate 31) are supported so as to be relatively rotatable about a rotation axis X that is coaxial with the axis of the intake camshaft 2. The rear case 11, the front case 12, and the ring gear 21 of the phase adjustment mechanism C are fastened and fixed by a plurality of fastening bolts 13.

  The driven side rotating body B (driven plate 31) is configured to rotate in conjunction with the ring gear 21 of the phase adjusting mechanism C, and this driven side rotating body B is connected and fixed to the intake camshaft 2 by a connecting bolt 35. ing.

[Valve opening / closing timing control device: phase adjustment mechanism]
The phase adjusting mechanism C includes a single ring gear 21, a single inner gear 22, a rotating member 23, a thrust ring 24, and a compression coil spring 25 as an urging member.

  The ring gear 21 is configured as an internal gear that is disposed around the rotation axis X and is fixed to the drive side rotating body A. The inner gear 22 is configured as an external gear accommodated in the ring gear 21. Specifically, the number of teeth of the plurality of teeth 22 </ b> A formed on the outer periphery of the inner gear 22 is set to be smaller than the number of teeth of the plurality of teeth 21 </ b> A formed on the inner periphery of the ring gear 21. Further, the inner gear 22 is offset from the rotation axis X by being fitted to the eccentric portion 23E of the rotating member 23 so as to be rotatable and slidable, and the eccentric shaft Y is in parallel with the rotation axis X. And is supported so as to be movable along the eccentric axis Y. From such a positional relationship, a part of the tooth part 22A of the inner gear 22 meshes with a part of the tooth part 21A of the ring gear 21.

  The rotating member 23 is supported by the front case 12 so as to be rotatable about the rotation axis X. The rotating member 23 includes a cylindrical support shaft portion 23A centering on a predetermined shaft core (coincident with the rotation shaft core X), and an eccentric shaft core Y eccentric with respect to the shaft core of the support shaft portion 23A. A cylindrical eccentric part 23E as a center is integrally formed.

  A fitting hole 23B having a fitting groove 23D is formed in the rotating member 23, and a fitting member 26 that rotates integrally with the output shaft Ma of the electric motor M with respect to the fitting groove 23D of the fitting hole 23B. Mating. Further, the fitting member 26 is configured to be fitted to the fitting groove 23D so as to be relatively movable in the direction along the rotation axis X and to be able to transmit torque.

  In this phase adjustment mechanism C, as shown in FIG. 1, the tooth line directions in the meshing region between the tooth portion 22 </ b> A of the inner gear 22 and the tooth portion 21 </ b> A of the ring gear 21 are based on the rotation axis X. It is comprised so that the tooth trace direction of a tooth part may have a taper part which inclines mutually in the same direction.

  That is, the ring gear 21 is a tapered gear whose reference pitch (which may be described by a tooth tip circle) of the tooth portion 21 </ b> A increases in diameter in the direction along the rotational axis X and close to the intake camshaft 2. It is configured as. Further, the inner gear 22 is a taper gear whose diameter increases as the reference pitch of the tooth portion 22A (which may be described by the tooth tip circle) is away from the intake camshaft 2 in the direction along the eccentric axis Y. It is configured.

  Since the ring gear 21 and the inner gear 22 are configured in this way, by bringing the ring gear 21 and the inner gear 22 relatively close to each other in the direction along the rotational axis X by the compression coil spring 25 (an example of an urging member), The tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 can be maintained in mesh with each other.

  The ring gear 21 has tooth portions 21A formed by skiving processing techniques disclosed in Japanese Patent Application Laid-Open No. 2012-45687, Japanese Patent Application Laid-Open No. 2012-143821, and the like. It is desirable for the phase adjusting mechanism C to increase the number of teeth of the ring gear 21 and increase the reduction ratio. To increase the reduction ratio, the tooth profile is formed into a trochoid shape. In skiving, a gear with a large number of teeth can be cut into a tooth profile such as a trochoid at high speed. By adopting this skiving, efficient production of the ring gear 21 is realized. ing.

  For example, the trochoidal tooth profile can be designed to have a smaller tooth thickness with respect to the tooth height than the cycloid tooth profile. Therefore, in order to obtain a large reduction gear ratio, it is possible to suppress an increase in diameter of the inner gear and the ring gear even if the number of teeth is increased. By utilizing such advantages, the number of teeth of the ring gear 21 is increased and the reduction ratio is increased. The tooth shape of the tooth portion 22 </ b> A of the inner gear 22 is formed in a shape that meshes with the tooth portion 21 </ b> A of the ring gear 21.

  As shown in FIG. 4, it is preferable that the tooth portion 22 </ b> A of the inner gear 22 is subjected to a crowning process in which the tooth surface is a curved surface having a smooth arc shape in the streak direction. By performing the crowning process in this manner, the transmission efficiency during the operation of the phase adjusting mechanism C is improved and the silence is realized. The crowning process may be formed only on the tooth portion 21 </ b> A of the ring gear 21, or may be formed on both the inner gear 22 and the ring gear 21.

[Valve opening / closing timing control device: driven plate]
As shown in FIGS. 3 and 5, the driven plate 31 is integrally formed with a plurality of restricting portions 31 </ b> A on the outer periphery of a disk-shaped member centering on the rotational axis X, and the intake camshaft is connected by a connecting bolt 35. 2 is connected to the shaft end.

  The driven plate 31 is provided with a plurality of columnar linkage pins 32 projecting in parallel with the rotation axis X, and the linkage pins 32 (an example of linkage members) are connected to the rotation axis X with respect to the inner gear 22. It engages with an engaging hole 22B (an example of an engaging recess) formed in a parallel posture. A plurality of linkage pins 32 and a plurality of engagement holes 22B constitute a linkage mechanism D, and the linkage mechanism D is configured to transmit the rotation of the ring gear 21 to the driven plate 31 (driven side rotating body B). ing.

  The engagement hole portion 22B is formed in a posture parallel to the rotation axis X, and allows the inner gear 22 to operate by setting its inner diameter to be larger than the outer diameter of the linkage pin 32. Further, by providing a plurality of linkage pins 32 in a posture parallel to the rotational axis X with respect to the driven plate 31 as in this configuration, the linkage pins 32 are brought into contact with the inner peripheral surface of the engagement hole 22B, and the inner gear. 22 is configured to maintain a proper posture. Instead of the engagement hole 22B, a recess that is parallel to the rotation axis may be formed in the inner gear 22.

  The rear case 11 is formed with a plurality of abutting portions 11A that determine the limit of relative rotation between the driving side rotating body A and the driven side rotating body B when the regulating portion 31A of the driven plate 31 abuts.

  As shown in FIGS. 2 and 3, the direction in which the driven-side rotator B rotates in the same direction as the drive rotation direction S with respect to the drive-side rotator A is referred to as the advance angle direction Sa, and the rotation direction in the opposite direction. Is referred to as the retarding direction Sb.

[Operating form]
With such a configuration, the driving side rotating body A and the driven side rotating body B are in a state of being mechanically coupled by the phase adjusting mechanism C. Accordingly, when the engine E is in operation, the driving side rotating body A and the driven side rotating body B rotate integrally. During this rotation, the fitting member 26 also rotates about the rotation axis X, so that when the electric motor M is in a non-driven (non-energized) state, the output shaft Ma of the electric motor M is also integrated with the valve opening / closing timing control device. Rotate to.

  When the electric motor M is driven, the rotating member 23 rotates about the rotation axis X, and along with this rotation, the eccentric portion 23E rotates about the rotation axis X, and the inner gear 22 rotates about the rotation axis X. Revolves around X (the position of the eccentric axis Y revolves). During this revolution, the meshing position of the tooth portion 22A of the inner gear 22 with the tooth portion 21A of the ring gear 21 is displaced along the inner circumference of the ring gear 21, so that the inner gear 22 rotates about the eccentric shaft core Y.

  From such an operation mode, the inner gear 22 is rotated relative to the ring gear 21 by an angle corresponding to the difference between the number of teeth of the tooth portion 21A of the ring gear 21 and the number of teeth of the inner gear 22 by driving the electric motor M. Let By this relative rotation, the drive rotation of the electric motor M is greatly decelerated and transmitted to the driven plate 31. As a result, the setting of the relative rotational phase of the driven side rotator B with respect to the drive side rotator A is realized.

  That is, by driving the output shaft Ma of the electric motor M in a predetermined direction in the operating state of the engine E, the relative rotational phase is displaced in the advance direction, and the output shaft Ma of the electric motor M is driven and rotated in the reverse direction. Thus, the relative rotational phase can be displaced in the retarding direction.

  Since this phase adjustment mechanism C obtains a very large reduction ratio, it enables fine adjustment of the relative rotational phase. Further, since the reduction ratio is large as described above, the relative rotation phase can be maintained even when the electric motor M is in the non-driven state.

  When the relative rotation phase of the driven side rotating body B with respect to the driving side rotating body A reaches the limit of the advance angle direction Sa or the retard angle direction Sb by the operation of the electric motor M, the restricting portion 31A of the driven plate 31 causes the rear case 11 to Excessive operation is prevented by contacting the contact portion 11A.

[Meshing state of ring gear and inner gear]
In particular, in this phase adjustment mechanism C, the urging force of the compression coil spring 25 acts on the inner gear 22, and the inner gear 22 is slidably moved along the eccentric axis Y with respect to the eccentric portion 23E of the rotating member 23. Since it is fitted, the inner gear 22 shifts along the eccentric axis Y in the direction approaching the intake camshaft 2.

  This shift direction is a direction in which the tooth portion 22A of the inner gear 22 presses against the tooth portion 21A of the ring gear 21. By this shift, the respective tooth portions 21A and the tooth portions 22A are maintained in a well meshed state.

  In this valve opening / closing timing control device, the inner gear 22 is relatively displaced in the rotational direction with respect to the front case 12. This relative displacement is performed at a low speed, and a thrust ring 24 is interposed between the compression coil spring 25 and the front case 12. The problem that the thrust due to the relative displacement acts on the compression coil spring 25 by the thrust ring 24 slipping with respect to the front case 12 is solved. A thrust bearing may be used in place of the thrust ring 24.

  In this configuration, by using a compression coil spring 25 that is generally used to obtain an urging force, for example, as compared with that using a leaf spring that displaces the inner gear 22 in a direction orthogonal to the rotation axis X. A large urging member can be used. Further, it is not necessary to form a space for accommodating a leaf spring or the like in the rotating member 23 or the like.

  It is further preferable that the tooth surfaces of the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 are formed into curved surfaces by crowning. In this case, not only the noise at the time of meshing is reduced, but also a good meshing state is maintained even if the inner gear 22 may tilt slightly. Durability is improved without causing uneven wear on the teeth 21A of the ring gear 21 and the teeth 22A of the inner gear 22 due to such meshing.

[Modification of Embodiment]
As a modification of this embodiment, for example, the urging force of the compression coil spring 25 may be adjusted by an external screw operation or the like. By configuring so that the urging force can be adjusted in this way, the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 are engaged with each other with an appropriate force, thereby suppressing an increase in driving load. .

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) As shown in FIG. 6, a tapered gear is used for the ring gear 21 and the inner gear 22, and the inclination direction of the tooth portion 21 </ b> A of the ring gear 21 and the tooth portion 22 </ b> A of the inner gear 22 is opposite to that of the above-described embodiment. Set to. Further, a disc spring 25 as an urging member that supports the inner gear 22 so as to be displaceable in the direction along the eccentric axis Y with respect to the eccentric portion 23E of the rotating member 23 and applies an urging force in a direction opposite to that of the embodiment. Prepare.

  In this alternative embodiment (a), the rotating member 23 is supported by the front case 12 so as not to move in the direction of the rotation axis X while allowing rotation about the rotation axis X. Further, by providing a disc spring 25 between the driven plate 31 and the inner gear 22, an urging force is applied to the inner gear 22.

  With this configuration, the inner gear 22 is displaced in the direction along the eccentric axis Y by the action of the urging force of the disc spring 25, and the meshing state between the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 is maintained. It becomes possible to do. In this another embodiment (a), the basic configuration is the same as that of the embodiment except for the configuration in which the urging force of the disc spring 25 is applied. Therefore, the valve opening / closing timing control device operates similarly to the embodiment. Is done.

[Modification of Another Embodiment (a)]
As a modification of this another embodiment (a), the rotating member 23 is supported by the front case 12 so as not to move in the direction of the rotation axis X while allowing rotation about the rotation axis X. A configuration may be adopted in which a compression coil spring 25 (a disc spring 25 may be used) is provided between the inner end of the rotating member 23 and the inner gear 22.

  When configured as in this modification, a bracket or the like that receives the urging force of the compression coil spring 25 is required at the inner end position of the rotating member 23. In this modified example, the meshing state between the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 can be maintained by the urging force of the compression coil spring 25.

(B) As shown in FIG. 7, taper gears are used for the ring gear 21 and the inner gear 22 as in the above-described embodiment, and the ring gear 21 is movable in the direction along the rotation axis X with respect to the drive side rotating body A. To support. Further, a disc spring 25 as an urging member for urging the ring gear 21 in the direction along the rotation axis X is provided inside the drive side rotator A.

  In this configuration, a disc-shaped spring with the disc spring 25 centered on the rotational axis X is used. For example, a configuration in which a plurality of disc springs 25 and compression coil springs are provided on the outer peripheral portion of the front case 12 is adopted. May be.

  With such a configuration, the ring gear 21 can be urged in the direction along the rotation axis X by the urging force of the disc spring 25 to maintain the meshing state between the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22. In this another embodiment (b), the basic configuration is the same as that of the embodiment except for the configuration in which the urging force of the disc spring 25 is applied. Therefore, the valve opening / closing timing control device operates in the same manner as in the embodiment. Is done.

[Modification of Another Embodiment (b)]
As a modification of this another embodiment (b), the inclination direction of the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 may be set in the opposite direction to the above-described embodiment. In this configuration, only the biasing direction of the ring gear 21 by the disc spring 25 is reversed, and the ring gear 21 is biased in the direction along the rotational axis X by the biasing force of the disc spring 25 as in the other embodiment (b). Thus, the meshing state of the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 can be maintained.

(C) The ring gear 21 and the inner gear 22 are tapered gears so that each of the meshing portions of the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 is inclined in the same direction about the rotation axis X. Configure. Further, the inner gear 22 is supported so as to be movable in the direction along the eccentric axis Y, the ring gear 21 is supported so as to be movable in the direction along the rotational axis X, and the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 are supported. Is provided with a biasing member that biases the ring gear 21 and the inner gear 22 in a direction in which the ring gear 21 meshes with each other.

  In another embodiment (c), the inner gear 22 may be configured to be displaced integrally with the rotating member 23 or may be configured to be displaced with respect to the eccentric portion 23E of the rotating member 23. .

  With this configuration, the ring gear 21 is urged in the direction along the rotation axis X by the urging force of the urging member, and the meshing state between the tooth portion 21A of the ring gear 21 and the tooth portion 22A of the inner gear 22 can be maintained. .

  The present invention can be used for a valve opening / closing timing control device having a differential speed reducing mechanism that sets the relative rotation phase by transmitting the drive of the electric actuator to the driving side rotating body and the driven side rotating body.

DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Intake camshaft 21 Ring gear 21A Tooth part 22 Inner gear 22A Tooth part 23 Rotating member 23E Eccentric part 25 Energizing member (compression coil spring, disc spring)
A Drive side rotator B Driven side rotator C Phase adjustment mechanism M Electric actuator (electric motor)
Y Eccentric shaft core X Rotating shaft core

Claims (5)

A drive side rotating body that rotates synchronously with the crankshaft around the rotation axis;
A driven-side rotator that is supported so as to be relatively rotatable with the drive-side rotator around the rotation axis and rotates integrally with at least one of an intake camshaft or an exhaust camshaft;
A gear type phase adjusting mechanism that sets a relative rotational phase of the driving side rotating body and the driven side rotating body by a driving force of an electric actuator;
The phase adjusting mechanism includes a ring gear arranged on the coaxial axis with the rotating shaft core, an eccentric shaft core parallel to the rotating shaft core and an inner gear arranged on the coaxial core, By engaging a part of the tooth part of the inner gear with a part of the peripheral tooth part and revolving the position of the eccentric shaft core around the rotation shaft core by the driving force of the electric actuator, A differential reduction mechanism that rotates the inner gear relative to the ring gear by an angle corresponding to the difference between the number of teeth and the number of teeth of the inner gear,
The ring gear and the inner gear are configured as tapered gears in which the tooth trace directions of the respective tooth portions are inclined in the same direction with respect to the rotation shaft core,
There is provided a biasing member that applies a biasing force that causes the tooth portion of the ring gear and the tooth portion of the inner gear to be relatively close to each other in the direction along the rotation axis, on at least one of the ring gear and the inner gear. Valve opening / closing timing control device. A rotation member that rotates around the rotation axis by the driving force of the electric actuator, and that is formed integrally with a columnar eccentric part centered on the eccentric axis;
The ring gear is supported so as not to rotate with respect to the drive-side rotator, the inner gear is supported so as to be rotatable with respect to the eccentric portion, and displaceable in a direction along the eccentric shaft core,
The valve opening / closing timing control device according to claim 1, wherein the biasing member applies a biasing force that displaces the inner gear in a direction along the eccentric shaft core. A rotation member that rotates around the rotation axis by the driving force of the electric actuator, and that is formed integrally with a columnar eccentric part centered on the eccentric axis;
The ring gear is non-rotatable with respect to the drive-side rotating body, and is supported to be displaceable in a direction along the rotation axis; the inner gear is supported to be rotatable with respect to the eccentric portion;
The valve opening / closing timing control device according to claim 1, wherein the urging member applies an urging force that displaces the ring gear in a direction along the rotation axis.   The valve opening / closing timing control device according to any one of claims 1 to 3, wherein a tooth portion of the inner gear is crowned.   The valve timing control apparatus according to any one of claims 1 to 4, wherein tooth shapes of tooth portions of the ring gear and the inner gear are formed in a trochoid shape.

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