JP2016061234A - Valve opening/closing timing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a valve opening/closing timing control device which performs a stable operation by suppressing a variation of a posture of a rotating shaft which supports an inner gear.SOLUTION: A valve opening/closing timing control device comprises a phase adjusting mechanism C which sets a relative rotation phase between a drive-side rotating body A which rotates synchronously with a crank shaft 2, and a driven-side rotating body which rotates integrally with a valve-opening/closing cam shaft 3. The phase adjusting mechanism C comprises a ring gear 21, an inner gear 22, a rotating shaft 24 which supports the inner gear 22 to an eccentric part 24B, and an electric actuator M which drives and rotates the rotating shaft 24. The phase adjusting mechanism also comprises a first bearing 26 which rotatably supports one end part of the rotating shaft 24 with respect to the drive-side rotating body A with a rotating axial core X as a center, and a second bearing 40 which suppresses the displacement of the other end part of the rotating shaft 24 to a direction orthogonal to the rotating axial core X with respect to the driven-side rotating body B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive-side rotating body that rotates in synchronization with a crankshaft, and a relative rotation phase between a driven-side rotating body that is rotatably supported relative to the driving-side rotating body and rotates integrally with a camshaft. The present invention relates to a valve opening / closing timing control device that changes according to force.

  As a valve opening / closing timing control device configured as described above, Patent Document 1 discloses that the rotation of a rotating shaft (a planetary frame in the literature) rotated by an electric motor is reduced by a rotating gear mechanism to be driven by a driving side rotating body. A technique for setting a relative rotational phase with a side rotating body is shown.

  In this patent document 1, a rotation operating gear mechanism is supported by an eccentric part of a rotating shaft driven and rotated around a rotating shaft core (rotating axis in the document) by an electric motor, and a large-diameter external tooth part and a small-diameter external tooth part. Are integrally formed (a planetary gear in the literature), a large-diameter ring gear supported by the driving-side rotator, and a small-diameter ring gear supported by the driven-side rotator. Further, a part of the inner gear part of the inner gear of the large-diameter ring gear is engaged with a part of the outer tooth part of the large-diameter (large-diameter part) of the inner gear. A differential reduction mechanism is configured by meshing a part of the outer teeth of the (diameter).

  In this reduction mechanism, the number of teeth of the inner teeth of the large-diameter ring gear is greater than the number of teeth of the outer teeth of the large-diameter inner gear, and the number of teeth of the inner teeth of the small-diameter ring gear is smaller than the number of teeth of the inner gear of the inner gear. It is set more than the number of teeth.

  With this configuration, the rotating shaft is rotated around the rotating shaft center by the driving force of the electric motor, so that the large-diameter inner gear changes the meshing position with respect to the large-diameter portion of the ring gear so that the eccentric portion of the rotating shaft is centered. Rotate to By this rotation, the small diameter portion of the inner gear operates in a form that changes the meshing position with the small diameter ring gear. As a result, deceleration is realized by the differential between the large-diameter ring gear and the large-diameter portion of the inner gear and the differential between the small-diameter ring gear and the small-diameter portion of the inner gear.

JP 2007-255412 A

  As shown in Patent Document 1, the outer end portion of the rotating shaft is supported (supported in a cantilever manner) by a driving side rotating body via a bearing. In a reduction gear system in which a part of the outer gear part of the inner gear is engaged with a part of the inner gear part of the ring gear and the inner gear is rotated around the eccentric shaft core, the load in the bending direction is always applied to the rotary shaft. Works.

  In Patent Document 1, a step portion is formed at the boundary between a large-diameter ring gear and a small-diameter ring gear, and the side surface of the inner gear can be in contact with the step portion, so that the load in the bending direction increases. However, when the inner gear comes into contact with the stepped portion, a large change in the attitude of the rotating shaft is suppressed.

  For example, assuming that the speed reduction mechanism is configured by a combination of one ring gear and one inner gear for miniaturization, the step portion shown in Patent Document 1 is not formed. Therefore, when the posture of the rotating shaft changes greatly due to the load acting on the rotating shaft in the bending direction, the meshing portion between the inner gear portion of the ring gear and the outer gear portion of the inner gear may be separated. it was thought. In particular, it is considered that when the rotational speed of the electric motor is changed, the load in the bending direction increases or decreases, and the meshing portion between the inner gear portion of the ring gear and the outer gear portion of the inner gear is more easily detached.

  An object of the present invention is to constitute a valve opening / closing timing control device that performs stable operation while suppressing fluctuations in the attitude of a rotating shaft that supports an inner gear.

A feature of the present invention is that a driving side rotating body that rotates synchronously with a crankshaft of an internal combustion engine around a rotation axis,
A driven-side rotator that is disposed so as to be relatively rotatable on a coaxial core with the drive-side rotator, and rotates integrally with a camshaft for opening and closing the valve of the internal combustion engine;
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 adjustment mechanism includes a rotation shaft disposed on the same axis as the rotation axis, a ring gear that is rotatably supported by the rotation axis, an eccentric shaft that is parallel to the rotation axis, and a coaxial axis. And an inner gear having an outer tooth portion that meshes with an inner tooth portion of the inner periphery of the ring gear, and an eccentric portion that is rotatably provided around the rotation shaft core and supports the inner gear in a relatively rotatable manner. The eccentric shaft core is driven and rotated by the driving force of the electric actuator in a state in which a part of the outer tooth part of the inner gear is engaged with a part of the inner tooth part of the inner periphery of the ring gear. Is revolved, and is configured as 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,
A first bearing that rotatably supports the rotating shaft about the rotating shaft core is provided in the drive side rotating body, and a first bearing that suppresses displacement of the rotating shaft in a direction orthogonal to the rotating shaft core is provided. Two bearings are provided in the driven side rotating body.

According to this, the rotating shaft is supported by the drive side rotating body by the first bearing so as to be rotatable around the rotating shaft core. Further, even when a bending load acts on the second bearing side of the rotating shaft and the second bearing side is displaced in a direction perpendicular to the rotating shaft core, the second bearing receives this displacement, so that the rotating shaft The posture is not greatly changed.
Therefore, a valve opening / closing timing control device is constructed that performs stable operation while suppressing fluctuations in the posture of the rotating shaft that supports the inner gear.

  In the present invention, the first bearing may support one end portion of the rotating shaft, and the second bearing may support the other end portion of the rotating shaft.

  According to this, when the other end portion of the rotating shaft is displaced in the direction orthogonal to the rotating shaft core in a state where the first bearing supports one end portion of the rotating shaft on the driving side rotating body, the second bearing is It becomes the form which receives the other end part of a rotating shaft, and becomes a form supported at the both ends of a rotating shaft. Therefore, one end portion of the rotating shaft is supported by the first bearing and the other end portion of the rotating shaft is supported by the second bearing, and the posture of the rotating shaft can be stabilized.

  In the present invention, the second bearing may have an annular shape and may include a support portion that surrounds an outer surface of the other end portion of the rotating shaft, and may be integrally formed on the camshaft side.

  According to this, since the second bearing integrally formed on the camshaft side has an annular shape, the step of attaching the second bearing to the camshaft or a member that rotates integrally with the camshaft becomes unnecessary, and the attitude of the rotating shaft is When it changes, it becomes possible to receive it strongly by a support part.

  In the present invention, the second bearing may have an annular shape and may include a support portion that surrounds the outer surface of the other end portion of the rotating shaft, and may be attached to the camshaft side.

  According to this, the second bearing attached to the camshaft side is formed in an annular shape, so that the second bearing can be obtained without changing the basic shape of the camshaft or the member that rotates integrally with the camshaft. If the posture of the rotating shaft is changed by simply attaching, it can be strongly received by the support portion.

  In the present invention, a gap may be formed between the support portion and the outer peripheral surface of the rotating shaft facing the support portion.

  According to this, even if a gap is formed between the outer periphery of the other end of the rotating shaft and the support portion of the second bearing, if the posture of the rotating shaft changes, the annular support portion of the second bearing When the rotating shaft comes into contact, it is possible to suppress a change in posture of the rotating shaft. In addition, by forming a gap, for example, when causing the wear like the configuration in which the support portion of the second bearing is brought into contact with the outer periphery of the other end portion of the first shaft, or during the operation of changing the relative rotation phase, A resistance is not applied to the rotation shaft, and the displacement speed of the relative rotation phase is not lowered.

It is a figure which shows the cross section of a valve timing control apparatus, and a control system. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. It is a disassembled perspective view of a valve opening / closing timing control device. It is sectional drawing of the valve opening / closing timing control apparatus of another embodiment (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
1 and 2 show the opening / closing timing (opening / closing timing) of the intake valve 3B by controlling the relative rotational phase between the driving side rotating body A and the driven side rotating body B by the driving force of the electric motor M as an electric actuator. 1 shows a valve opening / closing timing control device 1 for controlling

  The engine E (an example of an internal combustion engine) is configured to be a four-cycle type in which a piston 4 is slidably accommodated in a plurality of cylinder bores of a cylinder block, and the piston 4 is connected to a crankshaft 2 by a connecting rod 5. Yes. 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.

  This valve opening / closing timing control device 1 is driven by winding the timing chain 6 over the output sprocket 2S of the crankshaft 2 and the drive sprocket 11S formed on the outer periphery of the drive side rotating body A. It rotates in the direction of rotation S. As a transmission configuration for transmitting the rotational force of the crankshaft 2 to the valve opening / closing timing control device 1, a timing belt may be used, and the driving force of the crankshaft 2 is transmitted to the drive side rotating body A by a gear train having a large number of gears. A configuration may be used.

  The valve opening / closing timing control device 1 includes a driving side rotating body A that rotates synchronously with a crankshaft 2 of an engine E as an internal combustion engine, and a driven side rotating body B that is connected to an intake camshaft 3 of the engine E. A phase adjustment mechanism C that sets the relative rotation phase between the driving side rotating body A and the driven side rotating body B by the driving force of the electric motor M (an example of an electric actuator) is provided.

  The intake camshaft 3 has a configuration in which opening and closing of the intake valve 3B is controlled by a plurality of cam portions 3A with rotation. Then, when the relative rotation phase between the driving side rotating body A and the driven side rotating body B is set by the phase adjusting mechanism C, the opening / closing timing of the intake valve 3B by the cam portion 3A is realized.

  The valve opening / closing timing control device 1 of the present invention is not intended to control only what is provided in the intake camshaft 3, but may be used to control the opening / closing timing of the exhaust valve by being provided in the exhaust camshaft. . The valve opening / closing timing control device 1 of the present invention may be provided on both the intake camshaft 3 and the exhaust camshaft.

[Valve opening / closing timing control device]
As shown in FIGS. 1 to 5, the valve timing control apparatus 1 has a configuration in which a rear case 11 having a drive sprocket 11 </ b> S formed as a drive side rotating body A and a front case 12 are fastened by a plurality of fastening bolts 13. Have. A space formed by the rear case 11 and the front case 12 accommodates a phase adjustment mechanism C configured as a hypotrochoid reduction gear (a specific example of a differential reduction mechanism).

  The driven-side rotator B is composed of a ring gear 21 that constitutes the phase adjusting mechanism C and a driven plate 21P that is coupled to the ring gear 21. When the driven plate 21P is connected and fixed to the intake camshaft 3 by the connecting bolt 35, the driven-side rotator B rotates integrally with the intake camshaft 3. Further, the inner gear 22 constituting the phase adjustment mechanism C is linked to the front case 12 via the Oldham joint 30. That is, since the inner gear 22 rotates about the eccentric shaft core Y parallel to the rotational axis X, the Oldham coupling 30 that rotates the inner gear 22 and the drive side rotating body A equally is used. The mode of operation of this phase adjustment mechanism C will be described later.

  In the valve opening / closing timing control device 1, the driving side rotating body A is disposed on the same axis as the rotational axis X of the intake camshaft 3, and the electric motor M is supported on the engine E by the support frame 7. An output shaft Ma of the electric motor M is disposed on the rotation axis X and a coaxial axis.

  In this valve opening / closing timing control device, the driving side rotator A rotates in the driving rotation direction S by the driving force from the crankshaft 2. 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 by driving the phase adjustment mechanism C is referred to as an advance angle direction Sa, and the rotation direction in the opposite direction is referred to as the advance direction Sa. This is referred to as the retard direction Sb.

  The opening / closing timing of the intake valve 3B is advanced by displacing the relative rotational phase in the advance direction Sa, and the opening / closing timing of the intake valve 3B is delayed by displacing the relative rotation phase in the retard direction Sb.

[Control configuration]
The valve opening / closing timing control device 1 maintains the opening / closing timing of the intake valve 3B by rotating the output shaft Ma of the electric motor M at the same speed as the rotation speed of the intake camshaft 3 when the engine E is in operation. By increasing or decreasing the rotational speed of the output shaft Ma from this rotational speed, the control of shifting the relative rotational phase in the advance angle direction Sa or the retard angle direction Sb by the operation of the phase adjustment mechanism C is realized.

  The valve timing control device 1 includes a control unit 50 that controls the rotation of the electric motor M. The control unit 50 detects the rotation phase of the intake camshaft 3 and the rotation of the crankshaft 2. A detection signal from the crankshaft sensor 52 that detects the phase is acquired, and the rotational speed of the electric motor M is controlled.

  From this configuration, when maintaining the relative rotation phase of the valve timing control apparatus 1, the rotation speed of the electric motor M is controlled to be equal to the intake camshaft 3. When the intake timing of the intake valve 3B is changed by the valve opening / closing timing control device 1, the control unit 50 feeds back detection signals from the camshaft sensor 51 and the crankshaft sensor 52 so that the relative rotational phase is changed. Control is performed to increase or decrease the drive speed of the electric motor M until a predetermined value is reached. When the relative rotational phase reaches a predetermined value by this control, control is performed to return the rotational speed of the electric motor M to the constant speed of the intake camshaft 3.

[Valve opening / closing timing control device: phase adjustment mechanism]
The phase adjustment mechanism C includes a single ring gear 21, a single inner gear 22, and a drive shaft 24 as a rotating shaft that drives the inner gear 22. The ring gear 21 is arranged coaxially with the rotary shaft X and has a large number of internal teeth 21A. The ring gear 21 rotates integrally with the intake camshaft 3 when the driven plate 21P is connected and fixed to the intake camshaft 3 by a connecting bolt 35.

  The inner gear 22 has an outer tooth portion 22A having a smaller number of teeth than that of the ring gear 21, and is rotated by being supported by an eccentric portion 24B of a drive shaft 24 (an example of a rotating shaft) via a second ball bearing 27. It becomes rotatable about an eccentric axis Y that is eccentric from the axis X.

  The drive shaft 24 (an example of a rotating shaft) has a hole 24C centered on the rotating shaft core X, and is formed in a cylindrical shape as a whole. The outer end portion (one end portion) of the drive shaft 24 is formed with a first supported portion 24A having an outer surface shape centering on the rotation axis X, and the inner end portion (the other end portion) is formed as described above. An eccentric portion 24B having an outer shape centering on the eccentric shaft core Y that is eccentric from the rotational shaft core X and in a posture parallel to the rotational shaft core X is formed. Further, a second supported portion 24S centering on the rotation axis X is formed at the end position of the inner end portion (the other end portion). Further, a notch is formed in a part of the outer periphery of the eccentric part 24B, and the spring member 25 is fitted into this notch.

  A pair of engagement grooves 24 </ b> T are formed in the hole 24 </ b> C of the drive shaft 24 in the direction along the rotation axis X. The output shaft Ma of the electric motor M is provided with an engaging member 28 protruding in the radial direction so as to engage with the engaging groove 24T.

  As shown in FIG. 1, a first ball bearing 26 as a first bearing is supported at the opening portion of the front case 12 around the rotation axis X, and a first supported portion 24 </ b> A of the drive shaft 24 is supported by the first ball bearing 26. Is fitted. As a result, the drive shaft 24 is supported by the drive side rotator A so as to be rotatable about the rotation axis X. Further, an engagement member 28 driven by the electric motor M is engaged with an engagement groove 24 </ b> T at the outer end portion of the drive shaft 24.

  A second ball bearing 27 is fitted on the eccentric portion 24B of the drive shaft 24, and the inner gear 22 is supported on the outer periphery thereof. As a result, the inner gear 22 is rotatably supported around the eccentric shaft core Y of the eccentric portion 24B, and a part of the outer tooth portion 22A of the inner gear 22 meshes with a part of the inner tooth portion 21A of the ring gear 21. Further, the inner gear 22 is maintained in an engaged state by the urging force of the spring member 25.

  It is desirable that the phase adjusting mechanism C increase the number of teeth of the ring gear 21 to increase the reduction ratio. However, when the reduction ratio is increased, the inner gear portion 21A of the ring gear 21 is required to have high strength. For this reason, it is formed into a trochoidal tooth profile that can ensure a meshing rate in order to increase the strength of the internal tooth portion 21A.

[Valve opening / closing timing control device: Oldham coupling]
The Oldham coupling 30 includes an Oldham ring 31 disposed between the front case 12 and the inner gear 22, a pair of first keys 32 supported on the side surface of the inner gear 22, and a pair of first keys supported by the front case 12. 2 keys 33. The Oldham ring 31 is formed with a pair of first key grooves 30A that allow relative displacement in the radial direction of the first key 32 in a direction orthogonal to the rotation axis X, and a posture orthogonal to the first key groove 30A. A pair of second key grooves 30B that allow relative displacement of the second key 33 in the direction orthogonal to the rotation axis X are formed.

  Further, by forming the concave portion 30C in the region where the key groove is not formed in the Oldham ring 31, the Oldham ring is reduced in weight and the moment of inertia is reduced.

 The first key 32 is fixed to the side surface of the inner gear 22 or is formed integrally with the side surface of the inner gear 22. The second key 33 is integrally formed with a protrusion 33A that engages with the engagement recess 12A of the front case 12. As a result, the second key 33 is supported in a fixed state with respect to the front case 12. The second key 33 may be formed integrally with the front case 12.

〔bearing〕
In the phase adjusting mechanism C, as described above, the outer end portion (one end portion) of the drive shaft 24 is supported in a cantilever state by the first ball bearing 26 as the first bearing. In this phase adjustment mechanism C, a part of the outer tooth portion 22A of the inner gear 22 meshes with a part of the inner tooth portion 21A of the ring gear 21, so that the drive shaft 24 is always bent (perpendicular to the rotational axis X). Direction). In particular, since the load increases or decreases when the rotation speed of the electric motor M is changed, the bending gear acting on the inner end portion (the other end portion) of the drive shaft 24 causes a large displacement in the direction perpendicular to the rotation axis X, and the ring gear. It was also imagined that this would lead to the inconvenience of the outer tooth portion 22A of the inner gear 22 being detached from the inner tooth portion 21A of the 21.

  In order to suppress such inconvenience, an annular portion 40 is provided as a second bearing with respect to the driven plate 21P (driven side rotating body B). The annular part 40 is an annular part disposed on the same axis as the rotational axis X, and the inner support part 40S (an example of the support part of the second bearing) on the inner peripheral side is the second supported part 24S of the drive shaft 24. It is arranged in a state of being integrally formed at a position close to.

  As shown in FIG. 1, the annular portion 40 may be formed integrally with the driven plate 21 </ b> P, or may be formed of a separate member and attached to the driven plate 21 </ b> P.

  With this configuration, the first supported portion 24A of the drive shaft 24 is supported by the first ball bearing 26 so as to be rotatable about the rotation axis X, and the drive shaft 24 is rotatable about the rotation axis X. It becomes. Further, when the inner end portion of the drive shaft 24 is displaced by a load in the bending direction, the outer surface of the second supported portion 24S of the drive shaft 24 contacts the inner support portion 40S of the annular portion 40. It becomes a form received, and the displacement of the drive shaft 24 is suppressed. As a result, there is no inconvenience that the outer tooth portion 22A of the inner gear 22 is detached from the inner tooth portion 21A of the ring gear 21, and a stable operation of the valve opening / closing timing control device 1 is realized.

  In this bearing configuration, the drive shaft 24 and the annular shape are arranged by a positional relationship in which a gap is formed between the inner support portion 40S of the annular portion 40 and the outer peripheral surface of the second supported portion 24S of the drive shaft 24. The action of the frictional force with the portion 40 is reduced. In the present invention, the inner support portion 40S of the annular portion 40 and the outer peripheral surface of the second supported portion 24S of the drive shaft 24 may be disposed in close contact with each other. These members may be interposed.

  In the present invention, the second supported portion 24S is not formed at the end portion of the inner end portion (the other end portion) of the drive shaft 24, and the eccentric portion 24B is formed up to the position reaching the end portion of the inner end portion of the drive shaft 24. And you may provide the annular part 40 so that the inner support part 40S may surround this inner end part (eccentric part 24B). In the case where the annular portion 40 is provided at a position surrounding the eccentric portion 24B, the inner support portion 40S of the annular portion 40 is disposed at a position separated from the outer peripheral surface of the eccentric portion 24B. When the inner end portion of the shaft is displaced in the bending direction, the outer periphery of the eccentric portion 24B can be brought into contact with the inner support portion 40S of the annular portion 40, and the posture of the drive shaft 24 can be maintained.

  Further, the annular portion 40 decreases the surface pressure when the inner support portion 40S and the eccentric portion 24B are in contact with each other as the projecting amount in the direction along the rotation axis X is larger (the second supported portion described above). The surface pressure is similarly reduced when contacting with 24S), and wear can be suppressed even when the contact state frequently occurs.

[Operating form]
With this configuration, by driving the electric motor M at a speed higher or lower than the rotation speed of the intake camshaft 3, the drive shaft 24 rotates about the rotation axis X and the eccentric portion 24B centers on the rotation axis X. Revolve to. By this revolution, the meshing position of the inner gear 22 with respect to the inner tooth portion 21A of the ring gear 21 with respect to the outer tooth portion 22A is displaced along the inner periphery of the ring gear 21, and the inner gear rotates around the eccentric shaft core Y along with this displacement.

  The rotation of the drive shaft 24 is continued. For example, when the inner gear 22 revolves only once, an angle corresponding to the difference between the number of teeth of the inner tooth portion 21A of the ring gear 21 and the number of teeth of the outer tooth portion 22A of the inner gear 22 Therefore, the inner gear 22 rotates relative to the ring gear 21 only.

  This relative rotation causes the ring gear 21 to rotate with respect to the inner gear 22 when the inner gear 22 is considered as a reference. In this valve opening / closing timing control device 1, the inner gear 22 is configured to rotate (integrally) with the drive side rotating body A via the Oldham coupling 30, so that the relative rotational force is transmitted from the inner gear 22 to the ring gear 21. Thus, the intake camshaft 3 is relatively rotated through the driven plate 21P.

  When the electric motor M is driven, the center of the inner gear 22 (eccentric axis Y) revolves around the rotation axis X, and the Oldham coupling 30 allows this revolution.

  In particular, by providing the driven plate 21P with the annular portion 40 as the second bearing, the bending load acting on the inner end portion of the drive shaft 24 increases when the rotational speed of the electric motor M increases or decreases. Even when the inner end portion is greatly displaced, the annular portion 40 suppresses the displacement of the drive shaft 24, thereby suppressing the inconvenience that the outer tooth portion 22 </ b> A of the inner gear 22 is detached from the inner tooth portion 21 </ b> A of the ring gear 21. A stable operation of C is realized.

[Variation of valve timing control device]
As the valve opening / closing timing control device, a phase adjustment mechanism C is configured so that the ring gear 21 is supported by the driving side rotator A and the inner gear 22 is linked to the driven side rotator B via a linkage mechanism such as the oil dam joint 30. Also good. Also in this modification, the speed reduction due to the differential between the ring gear 21 and the inner gear 22 is performed in the same manner, and the rotation resulting from the differential between the ring gear 21 and the inner gear 22 can be transmitted to the intake camshaft 3.

  Also in this modified example, by disposing the annular portion 40 at a position close to the outer periphery of the inner end portion (the other end portion) of the drive shaft 24, the phenomenon that the drive shaft 24 is displaced by the action of an external force can be suppressed. .

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

(A) As shown in FIG. 6, a hole-like portion having an inner peripheral surface 24 </ b> U centering on the rotation axis X is formed on the inner end portion (the other end portion) of the drive shaft 24 as a rotation shaft. The driven-side rotating body B is configured with the insertion member 45 formed on the outer periphery (entire circumference) of the outer support portion 45S (an example of the support portion of the second bearing) facing the inner peripheral surface 24U as the second bearing. It is provided in the driven plate 21P. In this other embodiment (a), the insertion member 45 is formed on the rotation axis X and the coaxial axis.

  In this configuration, since the outer support portion 45S of the insertion member 45 is disposed opposite to the inner peripheral surface 24U of the inner end portion of the drive shaft 24, the inner end portion of the drive shaft 24 acts on the bending load. Is displaced by the internal insertion member 45, and there is no inconvenience that the external tooth portion 22A of the inner gear 22 is detached from the internal tooth portion 21A of the ring gear 21.

  As shown in FIG. 6, the insertion member 45 may be formed integrally with the driven plate 21P, or may be mounted with a separate member with respect to the driven plate 21P. Further, a member such as a ball bearing or a bush may be interposed between the inner peripheral surface 24U of the drive shaft 24 and the outer support portion 45S of the insertion member 45.

  As a modification of this other embodiment (a), the head of the connecting bolt 35 may be used as the insertion member 45 by attaching a bearing member to the outer periphery of the head of the connecting bolt 35 or the head. good. When the insertion member 45 is thus configured, the outer support portion 45S is opposed to the inner peripheral surface 24U formed separately from the hole portion 24C as in the other embodiment (a) described above. Alternatively, a configuration in which the outer support portion 45S of the insertion member 45 is opposed to the inner periphery of the hole portion 24C of the drive shaft 24 may be employed.

  In this modified example, a member such as a ball bearing or a bush may be interposed between the inner peripheral surface 24U of the drive shaft 24 or the inner surface of the hole 24C and the outer support portion 45S of the insertion member 45. good.

(B) The annular portion 40 of the embodiment and the insertion member 45 of another embodiment (a) are provided in the driven plate 21P as the second bearing. In this configuration, when a load acts on the drive shaft 24 in the bending direction and the inner end portion thereof is displaced, both the annular portion 40 and the insertion member 45 suppress the displacement, and the inner tooth portion of the ring gear 21. There is no inconvenience that the outer tooth portion 22A of the inner gear 22 is detached from 21A.

  INDUSTRIAL APPLICABILITY The present invention can be used for a valve opening / closing timing control device that includes an inner gear that meshes with a ring gear and has a phase adjustment mechanism that includes a rotating shaft that supports the inner gear on an eccentric portion.

1 Valve opening / closing timing control device 2 Crankshaft 3 Camshaft (intake camshaft)
21 Ring gear 21A Inner gear 22 Inner gear 22A Outer gear 24 Rotating shaft (drive shaft)
24B Eccentric part 24U Inner peripheral surface 26 1st bearing (1st ball bearing)
40 Second bearing (annular part)
40S support part (inner support part)
45 Second bearing (insertion member)
45S support part (outer support part)
A Drive side rotator B Driven side rotator C Phase adjustment mechanism E Internal combustion engine
M Electric actuator (electric motor)
X Rotating shaft core Y Eccentric shaft core

Claims (5)

A drive-side rotating body that rotates synchronously with the crankshaft of the internal combustion engine around the rotation axis;
A driven-side rotator that is disposed so as to be relatively rotatable on a coaxial core with the drive-side rotator, and rotates integrally with a camshaft for opening and closing the valve of the internal combustion engine;
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 adjustment mechanism includes a rotation shaft disposed on the same axis as the rotation axis, a ring gear that is rotatably supported by the rotation axis, an eccentric shaft that is parallel to the rotation axis, and a coaxial axis. And an inner gear having an outer tooth portion that meshes with an inner tooth portion of the inner periphery of the ring gear, and an eccentric portion that is rotatably provided around the rotation shaft core and supports the inner gear in a relatively rotatable manner. The eccentric shaft core is driven and rotated by the driving force of the electric actuator in a state in which a part of the outer tooth part of the inner gear is engaged with a part of the inner tooth part of the inner periphery of the ring gear. Is revolved, and is configured as 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,
A first bearing that rotatably supports the rotating shaft about the rotating shaft core is provided in the drive side rotating body, and a first bearing that suppresses displacement of the rotating shaft in a direction orthogonal to the rotating shaft core is provided. A valve opening / closing timing control device in which two bearings are provided in the driven side rotating body.   The valve opening / closing timing control device according to claim 1, wherein the first bearing supports one end of the rotating shaft, and the second bearing supports the other end of the rotating shaft.   The valve opening / closing timing according to claim 1 or 2, wherein the second bearing has an annular shape and has a support portion that surrounds the outer surface of the other end portion of the rotating shaft, and is integrally formed on the camshaft side. Control device.   3. The valve opening / closing timing control device according to claim 1, wherein the second bearing has an annular shape and has a support portion surrounding the outer surface of the other end portion of the rotating shaft, and is attached to the camshaft side. .   The valve opening / closing timing control device according to claim 3 or 4, wherein a gap is formed between the support portion and an outer peripheral surface of the rotating shaft facing the support portion.

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