JP5516937B2 - Valve timing control device - Google Patents

Valve timing control device Download PDF

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Publication number
JP5516937B2
JP5516937B2 JP2009222386A JP2009222386A JP5516937B2 JP 5516937 B2 JP5516937 B2 JP 5516937B2 JP 2009222386 A JP2009222386 A JP 2009222386A JP 2009222386 A JP2009222386 A JP 2009222386A JP 5516937 B2 JP5516937 B2 JP 5516937B2
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phase
spring
lock
engaging portion
rotating member
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JP2011069316A (en
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昌樹 小林
憲治 池田
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Aisin Corp
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Aisin Seiki Co Ltd
Aisin Corp
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Priority to JP2009222386A priority Critical patent/JP5516937B2/en
Priority to EP10002825A priority patent/EP2305969B1/en
Priority to CN201010139966.5A priority patent/CN102032011B/en
Priority to US12/749,744 priority patent/US20110073056A1/en
Publication of JP2011069316A publication Critical patent/JP2011069316A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34483—Phaser return springs

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Description

本発明は、自動車等の車輌に用いられる内燃機関の吸気弁および排気弁の開閉タイミングを調節する弁開閉時期制御装置に関するものであり、詳しくは、クランクシャフトに対して同期回転する駆動側回転部材と、この駆動側回転部材に対して相対回転可能に同軸に配置され、内燃機関の弁開閉用のカムシャフトに対して一体回転する従動側回転部材と、これら駆動側回転部材と従動側回転部材とにより形成され、駆動側回転部材に対する従動側回転部材の相対回転位相を遅角方向に移動させる遅角室と、両者の相対回転位相を進角方向に移動させる進角室、さらに、前記相対回転位相を所定のロック位相で拘束可能なロック機構を備えた弁開閉時期制御装置に関し、詳しくは、駆動側回転部材と従動側回転部材とをロック位相の方向に付勢する技術に関する。   The present invention relates to a valve opening / closing timing control device that adjusts the opening / closing timing of an intake valve and an exhaust valve of an internal combustion engine used in a vehicle such as an automobile, and more specifically, a drive-side rotating member that rotates synchronously with respect to a crankshaft. A driven-side rotating member that is coaxially disposed so as to be relatively rotatable with respect to the driving-side rotating member and that rotates integrally with a camshaft for opening and closing the valve of the internal combustion engine, and the driving-side rotating member and the driven-side rotating member A retarding chamber that moves the relative rotational phase of the driven-side rotating member relative to the driving-side rotating member in the retarding direction, an advance chamber that moves both relative rotational phases in the advanced direction, and the relative chamber More specifically, the valve opening / closing timing control device having a lock mechanism capable of restricting the rotation phase with a predetermined lock phase, and urging the drive side rotation member and the driven side rotation member in the direction of the lock phase. That relates to technology.

上記のように構成された弁開閉時期制御装置として、特許文献１には、駆動側回転部材（文献ではシューハウジング）と、従動側回転部材（文献ではベーンロータ）とを備え、従動側回転部材に備えたベーンによって収容室を二分して進角室と遅角室とが形成されたものが示されている。駆動側回転部材と従動側回転部材との位相差を最適な中間位置に設定するように嵌合型の拘束手段が備えられ、駆動側回転部材に対し従動側回転部材を進角方向に回転させる進角手段としてのスプリングを備えている。このスプリングの一端側が駆動側回転部材の係止穴に係止され、このスプリングの他端側が長孔状の係止穴（第２実施例）に係止されている。   As a valve opening / closing timing control device configured as described above, Patent Literature 1 includes a driving side rotating member (a shoe housing in the literature) and a driven side rotating member (a vane rotor in the literature). In the figure, the accommodation chamber is divided into two by the vane provided to form an advance chamber and a retard chamber. Fitting type restraining means is provided so as to set the phase difference between the driving side rotating member and the driven side rotating member to an optimum intermediate position, and the driven side rotating member is rotated in the advance direction with respect to the driving side rotating member. A spring is provided as an advance means. One end side of the spring is locked in the locking hole of the driving side rotating member, and the other end side of the spring is locked in the long hole-shaped locking hole (second embodiment).

このような構成から、従動側回転部材（カムシャフト側）が中間位置より遅角側にある状態でエンジンを始動させると、スプリングの付勢力により従動側回転部材を中間位置の方向に回転させ、拘束手段を嵌合させてエンジンの速やかな始動を実現する。このようにエンジンを始動させた後には、拘束手段に作動油を供給して嵌合を解除し、進角室と遅角室との一方に作動油を供給することで駆動側回転部材と従動側回転部材との相対回転が実現する。   From such a configuration, when the engine is started with the driven side rotating member (camshaft side) on the retard side from the intermediate position, the driven side rotating member is rotated in the direction of the intermediate position by the biasing force of the spring, A fast start of the engine is realized by fitting the restraining means. After starting the engine in this way, the hydraulic oil is supplied to the restraining means to release the fitting, and the hydraulic oil is supplied to one of the advance angle chamber and the retard angle chamber so that the drive side rotation member and the driven member are driven. Relative rotation with the side rotation member is realized.

この特許文献１では、前述したように拘束手段の嵌合を解いて駆動側回転部材に対して従動側回転部材を進角側に相対回転させる際には、スプリングの他端側が長孔状の係止穴において移動することによりスプリングの付勢力を作用させない構造を備えている。   In Patent Document 1, as described above, when the restraining means is disengaged and the driven side rotating member is rotated relative to the advance side with respect to the driving side rotating member, the other end side of the spring has a long hole shape. A structure is provided in which the biasing force of the spring does not act by moving in the locking hole.

また、上記のように構成された弁開閉時期制御装置として特許文献２には、駆動側回転部材と、従動側回転部材とを備え、従動側回転部材に備えたベーンによって収容室を二分して進角室と遅角室とが形成されている。駆動側回転部材と従動側回転部材とを中間ロック位相に固定保持するロック機構を備えており、駆動側回転部材と従動側回転部材とを中間ロック位相の方向に付勢しアシスト力を作用させるトーションスプリングを設けている。   In addition, as a valve opening / closing timing control device configured as described above, Patent Document 2 includes a driving side rotating member and a driven side rotating member, and the storage chamber is divided into two by vanes provided on the driven side rotating member. An advance chamber and a retard chamber are formed. A lock mechanism that fixes and holds the driving side rotating member and the driven side rotating member at the intermediate lock phase is provided, and the driving side rotating member and the driven side rotating member are urged in the direction of the intermediate lock phase to apply the assist force. A torsion spring is provided.

トーションスプリングは、中間ロック位相より遅角位相方向に位置する中間規制位相と最遅角位相との間の領域において遅角側の変位を抑制するとともに、エンジン始動後の中間ロック位相から中間規制位相への変位時におけるストッパーの機能を果たす。   The torsion spring suppresses the retard side displacement in the region between the intermediate restriction phase and the most retarded angle phase that are located in the retard angle direction from the intermediate lock phase, and the intermediate restriction phase from the intermediate lock phase after engine startup. Acts as a stopper when moving to

この特許文献２では、前述したトーションスプリングは、一方の端部が駆動側回転部材に固定され、他方の端部が従動側回転部材に径方向に設けられた開口に対して接当可能に備えられ、この他方の端部が挿入するスプリング受け溝が駆動側回転部材に形成されている。この構成により中間規制位相と最遅角位相との間の有効範囲においてトーションスプリングの他方の端部が開口の接当面に接当することで、従動側回転部材に対して付勢力を作用させる。また、中間規制位相においては、他方の端部がスプリング受け溝のストッパ面に接当することにより、従動側回転部材に付勢力を作用させることはない。   In this Patent Document 2, the above-described torsion spring is provided such that one end is fixed to the driving side rotating member and the other end can be brought into contact with an opening provided in the radial direction on the driven side rotating member. A spring receiving groove into which the other end is inserted is formed in the driving side rotating member. With this configuration, the other end portion of the torsion spring contacts the contact surface of the opening in an effective range between the intermediate restriction phase and the most retarded angle phase, thereby applying a biasing force to the driven side rotation member. In the intermediate restriction phase, the other end is in contact with the stopper surface of the spring receiving groove, so that no biasing force is applied to the driven side rotation member.

特開２０００‐３４５８１６号公報 （段落番号〔００５７〕〜〔００６７〕、図１、図２、図３、図６）JP-A-2000-345816 (paragraph numbers [0057] to [0067], FIG. 1, FIG. 2, FIG. 3, FIG. 6) 特開２００９‐７４３８４号公報 （段落番号〔００２６〕〜〔００２８〕、図３〜図７）JP 2009-74384 A (paragraph numbers [0026] to [0028], FIGS. 3 to 7)

駆動側回転部材と従動側回転部材との間に、これらを最遅角位相からロック位相の方向に付勢する付勢手段として、特許文献１あるいは特許文献２に記載されるようにトーションバネを用いるものでは、トーションバネのコイル部分にある程度の巻き数が必要であり、弁開閉時期制御装置全体の大型化を招くものであった。   As described in Patent Document 1 or Patent Document 2, a torsion spring is used as an urging means for urging them between the drive side rotation member and the driven side rotation member in the direction from the most retarded phase to the lock phase. What is used requires a certain number of turns in the coil portion of the torsion spring, leading to an increase in the size of the entire valve opening / closing timing control device.

つまり、駆動側回転部材に対する従動側回転部材が最遅角位相からロック位相のまでの相対回転領域におけるバネ荷重が大きく変動しないように、コイル部分にある程度の巻き数を必要とするため、この巻き数に対応した寸法だけ軸芯方向での空間を必要とし、装置全体の大型化を招いていたのである。   In other words, the coil portion requires a certain number of turns so that the spring load in the relative rotation region from the most retarded phase to the lock phase does not fluctuate significantly with respect to the driving side rotating member. Only the dimension corresponding to the number required a space in the axial direction, leading to an increase in the size of the entire apparatus.

本発明の目的は、駆動側回転部材と従動側回転部材とを最遅角位相から所定位相の方向に付勢する機能を損なうことなく小型に弁開閉時期制御装置を構成する点にある。   An object of the present invention is to configure a valve opening / closing timing control device in a small size without impairing the function of urging the drive side rotation member and the driven side rotation member from the most retarded phase to the predetermined phase direction.

本発明の特徴は、内燃機関のクランクシャフトに対して同期回転する駆動側回転部材と、前記駆動側回転部材に対して相対回転可能に同軸に配置され、前記内燃機関の弁開閉用のカムシャフトに対して一体回転する従動側回転部材と、前記駆動側回転部材と前記従動側回転部材とにより形成され、容積拡大により前記駆動側回転部材に対する前記従動側回転部材の相対回転位相を遅角方向に移動させる遅角室、および、容積拡大により前記相対回転位相を進角方向に移動させる進角室と、前記相対回転位相を所定のロック位相で拘束可能なロック機構とを備えると共に、前記駆動側回転部材に対する前記従動側回転部材の相対回転位相が、最遅角位相から所定位相までの遅角領域において前記所定位相方向に付勢力を作用させ、かつ、前記所定位相から最進角位相において付勢力を作用させないゼンマイバネを備え、前記駆動側回転部材に固定され、且つ円柱状をなす規制片が備えられ、前記ゼンマイバネは、前記ゼンマイバネの内端を折り曲げて形成された屈曲部でなる係合部を有し、前記相対回転位相が前記遅角領域から前記所定位相に達した際に、前記係合部の折曲げ内面側となる隅部に前記規制片が接当するように前記規制片と前記係合部との位置関係が設定されている点にある。 A feature of the present invention is that a drive-side rotating member that rotates synchronously with a crankshaft of an internal combustion engine and a camshaft that is coaxially disposed so as to be relatively rotatable with respect to the drive-side rotating member, The relative rotation phase of the driven side rotating member with respect to the driving side rotating member is retarded by expanding the volume, formed by a driven side rotating member that rotates integrally with the driven side rotating member, the drive side rotating member, and the driven side rotating member. A retarding chamber that is moved to an angle, an advance chamber that moves the relative rotational phase in an advance direction by expanding the volume, and a lock mechanism that can restrain the relative rotational phase at a predetermined locking phase, and the drive The relative rotational phase of the driven side rotational member with respect to the side rotational member causes a biasing force to act in the predetermined phase direction in a retardation region from a most retarded phase to a predetermined phase, and Comprises a spiral spring that does not act an urging force in the most advanced angle phase from the phase, is fixed to the driving side rotational member, and provided with a regulating piece forming a cylindrical shape, and the spiral spring is formed by bending an inner end of said spiral spring And when the relative rotational phase reaches the predetermined phase from the retarded angle region, the restricting piece comes into contact with a corner portion on the bent inner surface side of the engaging portion. The positional relationship between the restricting piece and the engaging portion is set so as to correspond .

内燃機関の始動時には、駆動側回転部材に対する従動側回転部材の相対回転位相がロック位相にあることは好ましいが、必ずしもロック位相にある必要はなく、例えば、ロック位相を基準にしてロック位相近傍の遅角領域側でも、ロック位相近傍の進角領域側でも良い。つまり、内燃機関の始動時には駆動側回転部材に対する従動側回転部材の相対回転位相がロック位相を含む所定領域にあることが良好な始動を実現する。
これに対して本発明の特徴では、駆動側回転部材に対する従動側回転部材の相対回転位相が遅角領域にある状態で内燃機関を始動した場合には、ゼンマイバネの付勢力により相対回転位相を所定位相方向に作用させ、相対回転位相を早期に所定位相の方向に移動させ内燃機関の始動性を高めることが可能となる。また、相対回転位相が所定位相より進角領域にある場合にはゼンマイバネの付勢力を作用させない。特に、ゼンマイバネを用いることにより、トーションバネのコイル部分に対応するスペースを必要としないので装置の大型化を抑制できる。その結果、駆動側回転部材と従動側回転部材とを最遅角位相から所定位相の方向に付勢する機能を損なうことなく小型に弁開閉時期制御装置を構成できた。
また、相対回転位相が遅角領域から所定位相に達した際に、係合部の折り曲げ内面側となる隅部に前記規制片が接当することにより、所定位相から最進角位相において付勢力を作用させることがない。 When the internal combustion engine is started, it is preferable that the relative rotation phase of the driven side rotation member with respect to the drive side rotation member is in the lock phase, but it is not necessarily in the lock phase. It may be on the retarded angle side or the advanced angle side near the lock phase. In other words, when the internal combustion engine is started, a favorable start is realized when the relative rotation phase of the driven side rotating member with respect to the driving side rotating member is in a predetermined region including the lock phase.
On the other hand, according to the feature of the present invention, when the internal combustion engine is started in a state where the relative rotational phase of the driven side rotational member with respect to the driving side rotational member is in the retardation region, the relative rotational phase is set to a predetermined value by the biasing force of the spring. It is possible to improve the startability of the internal combustion engine by operating in the phase direction and moving the relative rotational phase in the direction of the predetermined phase at an early stage. Further, when the relative rotational phase is in the advance region from the predetermined phase, the spring force of the mainspring is not applied. In particular, by using the spring spring, a space corresponding to the coil portion of the torsion spring is not required, so that an increase in size of the apparatus can be suppressed. As a result, the valve opening / closing timing control device can be configured in a small size without impairing the function of urging the driving side rotating member and the driven side rotating member from the most retarded phase to the predetermined phase.
Further, when the relative rotational phase reaches the predetermined phase from the retarded angle region, the biasing force is applied from the predetermined phase to the most advanced angle phase by contacting the restricting piece with the corner on the bent inner surface side of the engaging portion. Does not act.

本発明は、前記相対回転位相が、最遅角位相から前記ロック位相までの遅角領域において前記ロック位相方向に付勢力を作用させ、かつ、前記ロック位相から最進角位相において付勢力を作用させない前記ゼンマイバネを備えても良い。   In the present invention, the relative rotational phase applies an urging force in the lock phase direction in the retardation region from the most retarded phase to the lock phase, and the urging force acts in the most advanced angle phase from the lock phase. You may provide the spring spring which is not made.

この構成によると、駆動側回転部材に対する従動側回転部材の相対回転位相が遅角領域にある状態で内燃機関を始動した場合には、ゼンマイバネの付勢力により相対回転位相を前述した所定位相としてのロック位相方向に作用させ、相対回転位相を早期にロック位相で保持して内燃機関の始動性を高めることが可能となる。また、相対回転位相がロック位相より進角領域にある場合にはゼンマイバネの付勢力を作用させない。   According to this configuration, when the internal combustion engine is started in a state where the relative rotational phase of the driven-side rotational member with respect to the driving-side rotational member is in the retardation region, the relative rotational phase is set as the predetermined phase by the biasing force of the spring. It is possible to improve the startability of the internal combustion engine by acting in the lock phase direction and maintaining the relative rotation phase at the lock phase at an early stage. Further, when the relative rotational phase is in the advance region from the lock phase, the spring force of the mainspring is not applied.

本発明は、前記従動側回転部材と一体回転する軸状体の外周に、前記ロック位相から前記最進角位相までの進角領域に対応する領域長となる係合凹部が形成され、前記ゼンマイバネの内端を折り曲げて形成した前記係合部が前記係合凹部に係入され、前記ゼンマイバネの外端の支持部が前記駆動側回転部材と一体回転する支持体に支持され、前記係合部が前記係合凹部に係合する方向に前記ゼンマイバネによって付勢されても良い。 In the present invention, an engagement recess having a region length corresponding to an advance region from the lock phase to the most advanced angle phase is formed on an outer periphery of a shaft-like body that rotates integrally with the driven side rotation member, inner wherein the engaging portion formed by bending the end of which is engaged into the engaging recess, the support portion of the outer end of the spiral spring is supported on a support which rotates integrally with the driving side rotational member, the engaging portion of the May be biased by the mainspring spring in a direction to engage with the engaging recess.

この構成によると、ゼンマイバネの係合部と、軸状体の係合凹部との位置関係の設定により、駆動側回転部材に対して従動側回転部材の相対回転位相が遅角領域にある場合に従動側回転部材をロック位相の方向に回転させる付勢力を作用させることが可能となる。また、駆動側回転部材に対して従動側回転部材の相対回転位相が進角位相にある場合には、従動側回転部材の自由回転が許される。更に、係合部が軸芯方向に付勢されているので、係合部が係合凹部から分離する不都合を招くこともない。   According to this configuration, when the relative rotational phase of the driven-side rotating member is in the retarded region with respect to the driving-side rotating member due to the setting of the positional relationship between the spring spring engaging portion and the shaft-shaped engaging recess. It is possible to apply an urging force that rotates the driven side rotation member in the direction of the lock phase. In addition, when the relative rotation phase of the driven side rotating member is the advance angle phase with respect to the driving side rotating member, the driven side rotating member is allowed to freely rotate. Furthermore, since the engaging portion is biased in the axial direction, there is no inconvenience that the engaging portion is separated from the engaging recess.

本発明は、前記係合部に接当することで前記係合部の前記進角領域の方向への変位を規制する前記規制片を備えても良い。 The present invention may comprise the restricting piece for restricting a displacement in the direction of the advance region of the engaging portion by being brought into contact with the engaging portion.

この構成によると、規制片を備えることで係合部の位置を規制してゼンマイバネの付勢力が作用する範囲を設定できる。   According to this configuration, by providing the restriction piece, it is possible to set a range in which the position of the engaging portion is restricted and the urging force of the spring spring acts.

本発明は、前記ゼンマイバネのうち前記係合部の近傍部位に接当することで前記ゼンマイバネが膨らむ方向への前記係合部の変位を抑制する抑制片が備えられても良い。   The present invention may be provided with a restraining piece that suppresses displacement of the engaging portion in a direction in which the mainspring spring swells by contacting the vicinity of the engaging portion of the mainspring.

この構成によると、ゼンマイバネの係合部が係合凹部から分離する方向への変位を抑制片が抑制することにより、係合部が係合凹部から分離する不都合を招くこともない。   According to this structure, the suppression piece suppresses the displacement in the direction in which the engaging portion of the mainspring spring separates from the engaging recess, so that there is no inconvenience that the engaging portion is separated from the engaging recess.

本発明は、前記支持部が前記ゼンマイバネの中心方向に窪む凹状面で形成され、前記支持体が前記凹状面に嵌り込む突出面で形成され、前記凹状面と前記係合部とが、バネ本体を半径方向に挟み込む位置に配置されても良い。   In the present invention, the support portion is formed by a concave surface that is recessed in the center direction of the mainspring spring, the support body is formed by a protruding surface that fits into the concave surface, and the concave surface and the engagement portion are springs. You may arrange | position in the position which pinches | interposes a main body in radial direction.

この構成によると、突出面が凹状面に嵌り込むと同時に、係合部が係合凹部に係合する際には、バネ本体を半径方向に圧縮する力が作用する。この力の作用に起因するバネ荷重により、突出面を凹状面に嵌り込ませ、係合部を係合凹部に係入させる付勢力をバネ本体から作用させる。これにより、ゼンマイバネを確実に支持しながら、駆動側回転部材と従動側回転部材との間に確実に付勢力を作用させることが可能となる。   According to this configuration, when the projecting surface fits into the concave surface and the engaging portion engages with the engaging concave portion, a force that compresses the spring body in the radial direction acts. Due to the spring load resulting from the action of this force, the projecting surface is fitted into the concave surface, and an urging force for engaging the engaging portion into the engaging concave portion is applied from the spring body. Accordingly, it is possible to reliably apply the urging force between the driving side rotating member and the driven side rotating member while reliably supporting the mainspring spring.

電磁制御弁を備えた弁開閉時期制御装置の断面図である。It is sectional drawing of the valve opening / closing timing control apparatus provided with the electromagnetic control valve. 最遅角位相において図１のIIａ線とIIｂ線との断面図である。It is sectional drawing of the IIa line | wire and IIb line | wire of FIG. 1 in the most retarded angle phase. ロック位相における外部ロータと内部ロータを示す断面及びロック位相におけるゼンマイバネを示す断面図である。It is sectional drawing which shows the cross section which shows the external rotor and internal rotor in a lock phase, and the mainspring in a lock phase. 最進角位相における外部ロータと内部ロータを示す断面及び最進角位相におけるゼンマイバネを示す断面図である。It is sectional drawing which shows the cross section which shows the outer rotor and internal rotor in the most advanced angle phase, and the spring spring in the most advanced angle phase. ゼンマイバネの形状を示す斜視図である。It is a perspective view which shows the shape of a mainspring.

以下、本発明の実施の形態を図面に基づいて説明する。
〔基本構成〕
図１及び図２に示すように、エンジン（内燃機関）のクランクシャフト（図示せず）と同期回転する駆動側回転部材としての外部ロータ１と、エンジンの燃焼室の吸気弁又は排気弁を開閉するためのカムシャフト３と同軸で一体回転する従動側回転部材としての内部ロータ２と、電磁制御弁Ｖとを備えて弁開閉時期制御装置が構成されている。 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 1 as a drive side rotating member that rotates in synchronization with a crankshaft (not shown) of an engine (internal combustion engine), and an intake valve or an exhaust valve of a combustion chamber of the engine are opened and closed. A valve opening / closing timing control device is configured to include an internal rotor 2 as a driven side rotating member that rotates coaxially and integrally with the camshaft 3 and an electromagnetic control valve V.

この弁開閉時期制御装置は、外部ロータ１（駆動側回転部材）に対して、内部ロータ２（従動側回転部材）を嵌め込んだ構成を有している。これにより外部ロータ１と内部ロータ２とが、回転軸芯Ｘを中心として所定の相対回転位相の範囲内で相対回転自在となる。外部ロータ１と内部ロータ２との間には流体圧室が形成され、この流体圧室は、内部に配置されるベーン５によって遅角室１１と進角室１２とに仕切られている。   This valve opening / closing timing control device has a configuration in which an internal rotor 2 (driven side rotating member) is fitted into an external rotor 1 (driving side rotating member). As a result, the outer rotor 1 and the inner rotor 2 are rotatable relative to each other within a predetermined relative rotation phase with the rotation axis X as the center. A fluid pressure chamber is formed between the outer rotor 1 and the inner rotor 2, and the fluid pressure chamber is partitioned into a retard chamber 11 and an advance chamber 12 by a vane 5 disposed inside.

ベーン５は内部ロータ２の外周に形成されたベーン溝に挿入されると共に、板バネにより突出方向に付勢されている。これにより外部ロータ１と内部ロータ２との相対回転時には、ベーン５の外端が流体圧室内で外部ロータの内面に摺接する。   The vane 5 is inserted into a vane groove formed on the outer periphery of the inner rotor 2 and is urged in a protruding direction by a leaf spring. As a result, when the outer rotor 1 and the inner rotor 2 are rotated relative to each other, the outer end of the vane 5 is in sliding contact with the inner surface of the outer rotor in the fluid pressure chamber.

回転軸芯Ｘと同軸芯に前述したカムシャフト３が配置され、このカムシャフト３は、連結ボルト４によって内部ロータ２に連結されている。外部ロータ１の一方の面にフロントプレート６が配置され、この外部ロータ１の他方の面にリヤプレート７が配置され、これらは複数の固定ボルト８によって外部ロータ１に固定されている。この構造から内部ロータ２は、フロントプレート６とリヤプレート７とに挟み込まれる位置に配置される。   The above-described camshaft 3 is disposed coaxially with the rotary shaft X and this camshaft 3 is connected to the internal rotor 2 by a connecting bolt 4. A front plate 6 is disposed on one surface of the external rotor 1, and a rear plate 7 is disposed on the other surface of the external rotor 1, and these are fixed to the external rotor 1 by a plurality of fixing bolts 8. Due to this structure, the internal rotor 2 is disposed at a position sandwiched between the front plate 6 and the rear plate 7.

また、フロントプレート６には、外部ロータ１（駆動側回転部材）と、内部ロータ２（従動側回転部材）とに付勢力を作用させるゼンマイバネＳ（渦巻きバネ）を備えており、これを覆う位置にカバー９を備えている。ゼンマイバネＳの詳細については後述する。   Further, the front plate 6 is provided with a spring spring S (spiral spring) that applies an urging force to the outer rotor 1 (driving side rotating member) and the inner rotor 2 (driven side rotating member). Is provided with a cover 9. Details of the spring spring S will be described later.

リヤプレート７の外周には、タイミングスプロケット７Ｓが一体的に形成されている。このタイミングスプロケット７Ｓとエンジンの前記クランクシャフトに取り付けられたギアとの間にはタイミングチェーンやタイミングベルト等の動力伝達部材（図示せず）が架設される。   A timing sprocket 7 </ b> S is integrally formed on the outer periphery of the rear plate 7. A power transmission member (not shown) such as a timing chain or a timing belt is installed between the timing sprocket 7S and a gear attached to the crankshaft of the engine.

この構成から、エンジンの稼働時にはクランクシャフトの回転駆動力が動力伝達部材を介してタイミングスプロケット７Ｓに伝達され、外部ロータ１が図２等に示す回転方向Ｔに回転駆動する。この回転と連係して内部ロータ２が回転方向Ｔに回転することによりカムシャフト３が回転し、カムシャフト３に設けられたカム（図示せず）の駆動回転によりエンジンの吸気弁又は排気弁の開閉作動が行われる。   With this configuration, when the engine is in operation, the rotational driving force of the crankshaft is transmitted to the timing sprocket 7S via the power transmission member, and the external rotor 1 is rotationally driven in the rotational direction T shown in FIG. In conjunction with this rotation, the internal rotor 2 rotates in the rotational direction T to rotate the camshaft 3, and the drive rotation of a cam (not shown) provided on the camshaft 3 causes the intake valve or exhaust valve of the engine to rotate. Opening and closing operations are performed.

このように弁開閉時期制御装置は、エンジンの稼働時に、進角室１２に作動油が供給されることによりベーン５に作用する圧力で進角室１２の容積が拡大するとともに外部ロータ１に対して内部ロータ２が矢印Ｔ１に移動する。これにより外部ロータ１と内部ロータ２との相対回転位相が進角方向に移動する。これとは逆に、遅角室１１に作動油が供給されることによりベーン５に作用する圧力で遅角室１１の容積が拡大するとともに外部ロータ１に対して内部ロータ２が矢印Ｔ２に移動する。これにより外部ロータ１と内部ロータ２との相対回転位相が遅角方向に移動する。このようにクランク軸の回転位相に対するカムシャフト３の回転位相を変化させて吸気弁又は排気弁の開閉時期の制御を実現する。   In this way, the valve timing control device increases the volume of the advance chamber 12 by the pressure acting on the vane 5 by supplying the hydraulic oil to the advance chamber 12 when the engine is operating, and against the external rotor 1. Thus, the inner rotor 2 moves to the arrow T1. As a result, the relative rotational phase between the outer rotor 1 and the inner rotor 2 moves in the advance direction. On the contrary, when the hydraulic oil is supplied to the retarding chamber 11, the volume of the retarding chamber 11 is increased by the pressure acting on the vane 5, and the inner rotor 2 moves in the direction of the arrow T <b> 2 with respect to the outer rotor 1. To do. As a result, the relative rotational phase between the outer rotor 1 and the inner rotor 2 moves in the retard direction. In this way, the rotation phase of the camshaft 3 with respect to the rotation phase of the crankshaft is changed to control the opening / closing timing of the intake valve or the exhaust valve.

作動油としてエンジンオイルが利用され、弁開閉時期制御装置には、外部ロータ１と内部ロータ２との相対回転位相をエンジンの始動に適したロック位相に拘束するロック機構Ｌが設けられている。このロック機構Ｌはエンジンの始動直後において作動油の圧力が不安定な状況において外部ロータ１と内部ロータ２とを設定された相対回転位相に拘束（ロック）することで、クランクシャフトの回転位相に対するカムシャフト３の回転位相をエンジン始動に適した位相に維持し、エンジンの安定的な回転を現出する。   Engine oil is used as the working oil, and the valve opening / closing timing control device is provided with a lock mechanism L that restricts the relative rotational phase of the external rotor 1 and the internal rotor 2 to a lock phase suitable for starting the engine. This locking mechanism L restrains (locks) the outer rotor 1 and the inner rotor 2 to a set relative rotational phase in a situation where the hydraulic oil pressure is unstable immediately after the engine is started, so that the rotational phase of the crankshaft The rotational phase of the camshaft 3 is maintained at a phase suitable for engine start, and stable engine rotation appears.

このロック機構Ｌは、外部ロータ１に出退自在に設けられたプレート状の一対のロック片１４と、夫々のロック片１４を突出方向（内部ロータ２の方向）に突出付勢するスプリング１５と、夫々のロック片１４が係合するように内部ロータ２の外周部位に凹状に形成された一対のロック凹部１６とで構成されている。尚、ロック片１４の形状としては、本実施形態に示されたプレート状の他にピン状などを適宜採用することができる。   The lock mechanism L includes a pair of plate-like lock pieces 14 provided in the outer rotor 1 so as to be freely retractable, and a spring 15 that projects and urges each lock piece 14 in the protruding direction (in the direction of the internal rotor 2). , And a pair of lock recesses 16 formed in a concave shape on the outer peripheral portion of the inner rotor 2 so that the respective lock pieces 14 are engaged. In addition, as the shape of the lock piece 14, a pin shape or the like can be appropriately employed in addition to the plate shape shown in the present embodiment.

この弁開閉時期制御装置では複数の遅角室１１に対する作動油の給排を行う遅角室側油路１１ａと、複数の進角室１２に対する作動の給排を行う進角室側油路１２ａと、前述したロック凹部１６に対して作動油の給排を行うロック解除用油路１６ａとが内部ロータに形成されている。   In this valve opening / closing timing control device, a retard chamber side oil passage 11a for supplying and discharging hydraulic oil to and from the plurality of retard chambers 11 and an advance chamber side oil passage 12a for supplying and exhausting operations to the plurality of advance chambers 12 are provided. And an unlocking oil passage 16a for supplying and discharging hydraulic oil to and from the lock recess 16 described above is formed in the internal rotor.

図１及び図２に示すように、カムシャフト３に対して相対回転自在に外嵌するブッシュ１８を備え、このブッシュ１８の供給油路１８ａからカムシャフト３の内部油と３ａと、内部ロータ２の内部油路２ａとに順次作動油を供給する油路系が形成されている。この油路系により供給油路１８ａに対して油圧ポンプＰから供給される作動油を内部ロータ２の円筒状空間２Ｓに供給する。また、内部ロータ２に供給された作動油は、電磁制御弁Ｖが前述した遅角室側油路１１ａと、進角室側油路１２ａと、ロック解除用油路１６ａとに供給し、また、この電磁制御弁Ｖが遅角室側油路１１ａと、進角室側油路１２ａと、ロック解除用油路１６ａとから排出する。   As shown in FIGS. 1 and 2, a bush 18 that is externally fitted relative to the camshaft 3 is provided. The internal oil 3a of the camshaft 3 from the supply oil passage 18a of the bush 18 and the internal rotor 2 are provided. An oil passage system for sequentially supplying hydraulic oil to the internal oil passage 2a is formed. The hydraulic fluid supplied from the hydraulic pump P to the supply oil passage 18a is supplied to the cylindrical space 2S of the internal rotor 2 by this oil passage system. The hydraulic oil supplied to the internal rotor 2 is supplied to the retard chamber side oil passage 11a, the advance chamber side oil passage 12a, and the unlocking oil passage 16a by the electromagnetic control valve V, and The electromagnetic control valve V discharges from the retard chamber side oil passage 11a, the advance chamber side oil passage 12a, and the lock release oil passage 16a.

〔電磁制御弁〕
この電磁制御弁Ｖは、電磁ソレノイド２１で作動するスプール２２を有した作動油制御部Ｖａと、作動油の給排を行うように円柱状の作動油給排部Ｖｂとを一体的に形成した構造を有している。作動油給排部Ｖｂには、前述した内部油路２ａからの作動油を受け入れる主油路２３にチェック弁Ｃが備えられている。スプール２２で作動油の給排が制御される３つのポート２４、２５、２６が、この作動油給排部Ｖｂの外面の全周に溝状に形成され、夫々のポート２４、２５、２６の作動油の漏出を抑制するオイルシール２７が、この作動油給排部Ｖｂの外周に外嵌状態で備えられている。 (Electromagnetic control valve)
This electromagnetic control valve V is integrally formed with a hydraulic fluid control unit Va having a spool 22 that is operated by an electromagnetic solenoid 21 and a cylindrical hydraulic fluid supply / discharge portion Vb so as to supply and discharge hydraulic fluid. It has a structure. The hydraulic oil supply / discharge part Vb is provided with a check valve C in the main oil path 23 that receives the hydraulic oil from the internal oil path 2a. Three ports 24, 25, and 26 in which the supply and discharge of the hydraulic oil are controlled by the spool 22 are formed in a groove shape on the entire outer surface of the hydraulic oil supply and discharge portion Vb, and the respective ports 24, 25, and 26 An oil seal 27 that suppresses leakage of hydraulic oil is provided on the outer periphery of the hydraulic oil supply / discharge portion Vb in an externally fitted state.

前述した円筒状空間２Ｓは、回転軸芯Ｘを中心とする円筒状となるように内部ロータ２に形成され、この円筒状空間２Ｓに対して前述した電磁制御弁Ｖの作動油給排部Ｖｂが相対回転自在に挿嵌されている。尚、図面では、ポート２４、２５、２６に対応して遅角室側油路１１ａ、進角室側油路１２ａ、ロック解除用油路１６ａが連通しているが、油路の相対的な配置は、これに限るものではない。   The cylindrical space 2S described above is formed in the internal rotor 2 so as to be cylindrical with the rotation axis X as the center, and the hydraulic oil supply / discharge portion Vb of the electromagnetic control valve V described above with respect to the cylindrical space 2S. Are inserted so as to be relatively rotatable. In the drawing, the retard chamber side oil passage 11a, the advance chamber side oil passage 12a, and the unlocking oil passage 16a communicate with the ports 24, 25, and 26. The arrangement is not limited to this.

この弁開閉時期制御装置では、内部ロータ２とフロントプレート６との間、及び、内部ロータ２とリヤプレート７との間に作動油が僅かにリークする程度の隙間が形成されており、この他、可動部分を介しても作動油が僅かにリークする。そして、リークした作動油はオイルパン（図示せず）で回収される。   In this valve opening / closing timing control device, gaps are formed between the inner rotor 2 and the front plate 6 and between the inner rotor 2 and the rear plate 7 so that the hydraulic oil slightly leaks. The hydraulic oil leaks slightly even through the movable part. The leaked hydraulic oil is collected by an oil pan (not shown).

〔制御系の概要〕
図面には示していないが、弁開閉時期制御装置の制御系には、エンジンのクランクシャフトの回転角を検出するクランク角センサと、カムシャフト３の回転角を検出するカムシャフト角センサと、電磁制御弁Ｖを制御するＥＣＵ（図示せず）とを備えている。 [Outline of control system]
Although not shown in the drawings, the control system of the valve timing control device includes a crank angle sensor for detecting the rotation angle of the crankshaft of the engine, a camshaft angle sensor for detecting the rotation angle of the camshaft 3, an electromagnetic ECU (not shown) which controls the control valve V is provided.

ＥＣＵは、イグニッションキーのＯＮ／ＯＦＦ情報、エンジンオイルの油温を検出する油温センサからの情報等を取得する信号系が形成され、不揮発性メモリ内にエンジンの運転状態に応じた最適の相対回転位相の制御情報を記憶している。   The ECU has an ON / OFF information on the ignition key, a signal system that acquires information from an oil temperature sensor that detects the oil temperature of the engine oil, etc., and an optimum relative to the operating state of the engine in the nonvolatile memory. Stores rotational phase control information.

そして、このＥＣＵは、運転状態（エンジン回転数、冷却水温など）の情報と、前述したクランク角センサとカムシャフト角センサとの検出結果から外部ロータ１と内部ロータ２との相対位相を検出する。そして、これらの情報に基づき電磁制御弁Ｖを操作して遅角室側油路１１ａと、進角室側油路１２ａと、ロック解除用油路１６ａとに対する作動油の給排を行い、外部ロータ１と内部ロータ２と相対回転位相を制御する。これにより、最遅角位相（遅角室１１の容積が最大となる相対回転位相）と最進角位相（進角室１２の容積が最大となる相対回転位相）との間で位相制御が実現し、ロック機構Ｌによるロック状態と非ロック状態とが実現する。   The ECU detects the relative phase between the external rotor 1 and the internal rotor 2 based on the information on the operating state (engine speed, coolant temperature, etc.) and the detection results of the crank angle sensor and the camshaft angle sensor. . Based on this information, the electromagnetic control valve V is operated to supply / discharge hydraulic oil to / from the retard chamber side oil passage 11a, the advance chamber side oil passage 12a, and the unlocking oil passage 16a. The relative rotation phase between the rotor 1 and the internal rotor 2 is controlled. Thereby, phase control is realized between the most retarded phase (relative rotational phase at which the volume of the retarded chamber 11 is maximized) and the most advanced phase (relative rotational phase at which the volume of the advanced chamber 12 is maximized). Thus, the locked state and the unlocked state by the lock mechanism L are realized.

エンジンを停止させる操作が行われた場合にＥＣＵは、ロック解除用油路１６ａの作動油を排出した状態で、遅角室１１又は進角室１２に作動油の供給を行うことで外部ロータ１と内部ロータ２との相対位相をロック位相の方向に移動させる。これにより、一対のロック片１４が、これに対応する一対のロック凹部１６に係合した状態でエンジンが停止する。そして、この停止の後にエンジンを始動させた際には、ロック機構Ｌが外部ロータ１と内部ロータ２とを拘束して夫々の相対回転を阻止して安定的にエンジンが始動する。   When the operation for stopping the engine is performed, the ECU supplies the hydraulic oil to the retard chamber 11 or the advance chamber 12 in a state where the hydraulic oil in the unlocking oil passage 16a has been discharged, whereby the external rotor 1 And the internal rotor 2 are moved in the direction of the lock phase. As a result, the engine stops with the pair of lock pieces 14 engaged with the pair of lock recesses 16 corresponding thereto. When the engine is started after this stop, the lock mechanism L restrains the external rotor 1 and the internal rotor 2 to prevent the relative rotation of each, and the engine is stably started.

エンジンの始動後には、ＥＣＵがロック解除用油路１６ａに作動油を供給することにより、ロック片１４をロック凹部１６から押し上げてロックを解除する。そして、ＥＣＵがロック解除用油路１６ａに作動油の圧力が作用する状態を継続した状態で、外部ロータ１と内部ロータ２との相対位相を変更することにより、ＥＣＵによる吸気弁、排気弁の開閉時期の制御が行われる。   After the engine is started, the ECU supplies hydraulic oil to the unlocking oil passage 16a to push up the lock piece 14 from the lock recess 16 to release the lock. Then, the ECU changes the relative phase between the external rotor 1 and the internal rotor 2 in a state where the pressure of the hydraulic oil is applied to the unlocking oil passage 16a, whereby the intake valve and the exhaust valve of the ECU are changed. The opening / closing timing is controlled.

前述したゼンマイバネＳは、外部ロータ１に対して内部ロータ２がロック位相より遅角側の領域にある場合に、内部ロータ２に対してロック位相方向（所定位相の方向）に付勢力を作用させる機能を有している。従って、カムシャフト３と一体回転する内部ロータ２の相対位相が、カムシャフト３がバルブスプリングから受ける抵抗のために、外部ロータ１の回転に対し、遅れ傾向になる不都合を解消する。   The spring spring S described above applies an urging force to the internal rotor 2 in the lock phase direction (predetermined phase direction) when the internal rotor 2 is in a region on the retard angle side with respect to the external rotor 1. It has a function. Accordingly, the inconvenience that the relative phase of the internal rotor 2 that rotates integrally with the camshaft 3 tends to lag with respect to the rotation of the external rotor 1 due to the resistance that the camshaft 3 receives from the valve spring is eliminated.

過大な負荷がエンジンに作用してエンジンストップの状態に陥った場合には、外部ロータ１に対して内部ロータ２が最遅角位相に達していることもある。このような状況でエンジンを始動した場合には、安定的なエンジン始動を行うために、ＥＣＵは、外部ロータ１に対する内部ロータの位相を早期にロック位相に移動させロック状態に設定する制御が行われる。   When an excessive load acts on the engine and the engine stops, the internal rotor 2 may reach the most retarded phase with respect to the external rotor 1. When the engine is started in such a situation, in order to start the engine stably, the ECU performs control for quickly moving the phase of the internal rotor relative to the external rotor 1 to the lock phase and setting the lock state. Is called.

具体的な制御形態として、ＥＣＵの制御により電磁制御弁Ｖは、ロック解除用油路１６ａの作動油を排出し、遅角室側油路１１ａの作動油を排出すると共に、進角室側油路１２ａに作動油を供給することで、外部ロータ１に対して内部ロータ２をロック位相の方向に移動させる。この制御により、外部ロータ１と内部ロータ２とがロック位相に達したタイミングでロック片１４がロック凹部１６に係合してロック機構Ｌがロック状態に達する。尚、最遅角位相のうち内部ロータ２が最も遅角側にある回転位相を超遅角位相と称する。   As a specific control mode, the electromagnetic control valve V discharges the hydraulic oil in the unlocking oil passage 16a, discharges the hydraulic oil in the retard chamber side oil passage 11a, and advances the advance chamber side oil as controlled by the ECU. By supplying the hydraulic oil to the path 12a, the inner rotor 2 is moved in the lock phase direction with respect to the outer rotor 1. By this control, the lock piece 14 engages with the lock recess 16 at the timing when the outer rotor 1 and the inner rotor 2 reach the lock phase, and the lock mechanism L reaches the locked state. The rotational phase in which the internal rotor 2 is on the most retarded side among the most retarded phase is referred to as a super retard phase.

しかしながら、内部ロータ２が超遅角位相にある状態においてエンジンを始動した場合に、相対回転位相がロック位相に達するまでに時間を要することになり、エンジンの始動が円滑に行われない。特に、寒冷地でのエンジン停止時に低温であることから作動油の粘性が高く、遅角室１１、進角室１２に対する作動油の給排が円滑に行われず、この理由からもエンジンの始動が円滑に行われない。このような不都合を改善するため、前述したゼンマイバネＳが外部ロータ１と内部ロータ２とのロック位相方向への相対移動をアシストしてロック位相に達するまでの時間の短縮を図っている。   However, when the engine is started in a state where the internal rotor 2 is in the ultra retard angle phase, it takes time until the relative rotation phase reaches the lock phase, and the engine is not started smoothly. In particular, since the temperature of the engine oil is low when the engine is stopped in a cold region, the viscosity of the hydraulic oil is high, and the hydraulic oil is not smoothly supplied to and discharged from the retard chamber 11 and the advance chamber 12. Not smoothly. In order to improve such an inconvenience, the above-described mainspring S assists the relative movement of the outer rotor 1 and the inner rotor 2 in the lock phase direction to shorten the time required to reach the lock phase.

〔ゼンマイバネ〕
図２（ｂ）及び図５に示すように、ゼンマイバネＳ（渦巻きバネ）は、外部ロータ１（駆動側回転部材）に対する内部ロータ２（従動側回転部材）の相対回転位相が、最遅角位相からロック位相までの遅角領域Ａでロック位相方向に付勢力を作用させる。更に、このゼンマイバネＳは、ロック位相から最進角位相までの進角領域Ｂでは付勢力を作用させないように機能する。尚、ゼンマイバネＳは、遅角領域Ａの全領域でロック位相方向に付勢力を作用させる必要はなく、例えば、超遅角位相からロック位相の近傍まで付勢力を作用させるものでも、ロック位相を基準にして進角側でロック位相の近傍の進角領域Ａまで付勢力を作用させるものでも良い。このようにゼンマイバネＳの付勢力が作用する位相が本発明の所定位相でありエンジン（内燃機関）の始動に適した位相（領域）となる。 [Spring spring]
As shown in FIG. 2B and FIG. 5, the spring spring S (spiral spring) is such that the relative rotational phase of the internal rotor 2 (driven rotational member) with respect to the external rotor 1 (driving rotational member) is the most retarded phase. The urging force is applied in the lock phase direction in the retardation region A from the lock phase to the lock phase. Further, the spring spring S functions so as not to apply an urging force in the advance angle region B from the lock phase to the most advanced angle phase. The spring spring S does not need to apply an urging force in the lock phase direction in the entire retard angle region A. For example, even if the urging force is applied from the super retard phase to the vicinity of the lock phase, An urging force may be applied to the advance angle region A near the lock phase on the advance side with respect to the reference. Thus, the phase on which the urging force of the spring spring S acts is the predetermined phase of the present invention and is a phase (region) suitable for starting the engine (internal combustion engine).

このゼンマイバネＳは帯状のバネ材を渦巻き状に成形したものであるため、トーションバネのようにコイル部を備えたものと比較すると、厚み（回転軸芯Ｘ方向での寸法）を小さくでき、このゼンマイバネＳを備えた場合でも、回転軸芯Ｘの方向で大きいスペースを必要とせず、弁開閉時期制御装置の小型化を実現する。   Since the spring spring S is formed by spirally forming a belt-shaped spring material, the thickness (dimension in the direction of the rotation axis X) can be reduced as compared with a coil spring like a torsion spring. Even when the spring spring S is provided, a large space is not required in the direction of the rotation axis X, and the valve opening / closing timing control device can be downsized.

内部ロータ２の軸状部１０（軸状体の一例）の外周に進角領域Ｂに対応する領域長の開口幅（周方向での開口幅）を有した係合凹部１０Ｇが形成され、外部ロータ１に連結するフロントプレート６には回転軸芯Ｘの方向に突出する突出面６Ｔが形成されている。   An engagement recess 10G having an opening width (opening width in the circumferential direction) corresponding to the advance angle region B is formed on the outer periphery of the shaft-like portion 10 (an example of the shaft-like body) of the inner rotor 2, The front plate 6 connected to the rotor 1 is formed with a protruding surface 6T that protrudes in the direction of the rotation axis X.

ゼンマイバネＳは、渦巻き状のバネ本体３０を備えると共に、その内端位置には係合凹部１０Ｇに係入する係合部３１が折曲げ加工により形成され、その外端位置には突出面６Ｔ（支持体の一例）が嵌り込むようにゼンマイバネＳの中心方向（回転軸芯Ｘ）に窪む凹状面３２（支持部の一例）が形成されている。   The mainspring S includes a spiral spring main body 30, and an engagement portion 31 engaged with the engagement recess 10 </ b> G is formed by bending at an inner end position thereof, and a projecting surface 6 </ b> T ( A concave surface 32 (an example of a support portion) that is recessed in the center direction (rotation axis X) of the mainspring spring S is formed so that the support body) is fitted therein.

フロントプレート６には、係合部３１に接当することにより、この係合部３１の進角領域Ｂの方向への変位を規制するようにピンで成る規制片３３が備えられている。更に、フロントプレート６には、ゼンマイバネＳのうち係合部３１の近傍部位に接当することによりゼンマイバネＳの直径が膨らむ方向への係合部３１の変位を抑制するようにピンで成る抑制片３４が備えられている。   The front plate 6 is provided with a regulating piece 33 made of a pin so as to regulate the displacement of the engaging portion 31 in the direction of the advance angle region B by coming into contact with the engaging portion 31. Furthermore, the front plate 6 is a restraining piece made of a pin so as to restrain the displacement of the engaging portion 31 in the direction in which the diameter of the spring spring S swells by coming into contact with the vicinity of the engaging portion 31 of the spring spring S. 34 is provided.

ゼンマイバネＳの中心位置を基準として同じ方向の領域において、前述した係合部３１と凹状面３２とがバネ本体３０を挟み込む位置に配置されている。また、ゼンマイバネＳは、無荷重の自由状態で係合部３１から凹状面３２までの距離が、係合凹部１０Ｇから突出面６Ｔまでの距離より少し長く設定されている。更に、ゼンマイバネＳの外周近傍のバネ本体３０の間隙にはスペーサ３５が挟み込まれている。   In the region in the same direction with the center position of the spring spring S as a reference, the engaging portion 31 and the concave surface 32 described above are disposed at positions where the spring body 30 is sandwiched. The spring spring S is set such that the distance from the engaging portion 31 to the concave surface 32 is slightly longer than the distance from the engaging concave portion 10G to the protruding surface 6T in a free state with no load. Further, a spacer 35 is sandwiched in the gap between the spring bodies 30 in the vicinity of the outer periphery of the mainspring spring S.

この配置とゼンマイバネＳの特性とにより、ゼンマイバネＳをセットする際には、係合部３１と凹状面３２との距離を少し小さくするようにバネ本体３０を半径方向に圧縮することになり、前述した付勢力が得られる。これにより、バネ本体３０の弾性力で係合部３１が係合凹部１０Ｇに嵌り込む方向（回転軸芯Ｘの方向）付勢される。これと同時に凹状面３２が突出面６Ｔに圧接する方向に付勢される。また、スペーサ３５によりバネ本体３０に適切な間隙が形成される。これにより、ゼンマイバネＳの両端が確実に支持されると共に、外部ロータ１と内部ロータ２との間に確実に付勢力を作用させることが可能となる。   Due to this arrangement and the characteristics of the spring spring S, when the spring spring S is set, the spring body 30 is compressed in the radial direction so that the distance between the engaging portion 31 and the concave surface 32 is slightly reduced. Can be obtained. Thereby, the engaging part 31 is urged in the engaging recess 10 </ b> G (the direction of the rotation axis X) by the elastic force of the spring body 30. At the same time, the concave surface 32 is urged in a direction in which the concave surface 32 comes into pressure contact with the protruding surface 6T. Further, an appropriate gap is formed in the spring body 30 by the spacer 35. As a result, both ends of the spring spring S are securely supported, and an urging force can be reliably applied between the outer rotor 1 and the inner rotor 2.

そして、図２（ａ）に示すように、外部ロータ１に対して内部ロータ２が超遅角となる相対位相でエンジンが停止した状態では、図２（ｂ）に示すように、係合凹部１０Ｇの開口端部に係合部３１が接当する状態にあり、ゼンマイバネＳが外部ロータ１と内部ロータ２との相対回転位相をロック位相の方向に移動させる付勢力を作用させる。   As shown in FIG. 2 (a), when the engine is stopped at a relative phase where the internal rotor 2 is super retarded with respect to the external rotor 1, as shown in FIG. The engaging portion 31 is in contact with the opening end of 10G, and the mainspring spring S applies a biasing force that moves the relative rotational phase between the outer rotor 1 and the inner rotor 2 in the lock phase direction.

この状態においてエンジンが始動した場合には、ロック位相に達するまでゼンマイバネＳの付勢力が、突出面６Ｔと軸状部１０とを介して外部ロータ１と内部ロータ２とに作用し続ける。そして、図３（ａ）に示すように、外部ロータ１と内部ロータ２との相対回転位相がロック位相に達すると、図３（ｂ）に示すように、係合部３１が規制片３３に接当する。このようにゼンマイバネＳからの付勢力が作用する領域が遅角領域Ａに対応する。   When the engine is started in this state, the urging force of the mainspring S continues to act on the external rotor 1 and the internal rotor 2 via the protruding surface 6T and the shaft-like portion 10 until the lock phase is reached. As shown in FIG. 3A, when the relative rotational phase between the outer rotor 1 and the inner rotor 2 reaches the lock phase, the engaging portion 31 is moved to the restricting piece 33 as shown in FIG. Get in touch. Thus, the region where the urging force from the mainspring S acts corresponds to the retarded region A.

このロック位相に達し、係合部３１が規制片３３に接当することにより、軸状部１０にゼンマイバネＳの付勢力を作用させることはない。また、ロック機構Ｌのロック片１４がロック凹部１６に係入してロック状態に達し、安定的なエンジンの始動が実現する。ゼンマイバネＳの係合部３１が抑制片３４に接当することによりゼンマイバネＳの膨らみ方向への変位が抑制され、係合凹部１０Ｇから係合部３１が離間する不都合を招くこともない。   When the locking phase is reached and the engaging portion 31 comes into contact with the restricting piece 33, the urging force of the spring spring S is not applied to the shaft-like portion 10. Further, the lock piece 14 of the lock mechanism L is engaged with the lock recess 16 to reach the locked state, and stable engine start is realized. When the engagement portion 31 of the spring spring S contacts the restraining piece 34, the displacement of the spring spring S in the bulging direction is restrained, and there is no inconvenience that the engagement portion 31 is separated from the engagement recess 10G.

エンジンが始動した後において、図４（ａ）に示すように、内部ロータ２が進角方向の進角領域Ｂに移動した場合には、図４（ｂ）に示すように、係合凹部１０Ｇの開口端部から係合部３１が離間する位置に達し、ゼンマイバネＳの付勢力は内部ロータ２には作用せず、外部ロータ１と内部ロータ２との何れかへの作動油の供給による適正な相対移動を実現する。   When the internal rotor 2 moves to the advance angle region B in the advance direction as shown in FIG. 4A after the engine is started, as shown in FIG. 4B, the engagement recess 10G The engagement portion 31 reaches a position away from the opening end of the spring, and the urging force of the mainspring spring S does not act on the internal rotor 2, and is appropriate by supplying hydraulic oil to either the external rotor 1 or the internal rotor 2. Realize relative movement.

特に、フロントプレート６に係合用の凹部や孔部を形成し、これに対してゼンマイバネＳの外端部を折り曲げて係合させるようにゼンマイバネＳの外端部の支持構造を構成しても良い。また、係合部３１としてゼンマイバネＳの内端部にピン等を突設することで係合凹部１０Ｇに係合するように構成しても良い。   In particular, the support structure for the outer end portion of the mainspring spring S may be configured such that a recess or hole for engagement is formed in the front plate 6 and the outer end portion of the mainspring spring S is bent and engaged with the recess. . Moreover, you may comprise so that it may engage with the engagement recessed part 10G by protrudingly providing a pin etc. in the inner end part of the mainspring spring S as the engaging part 31. FIG.

このように本発明の弁開閉時期制御装置では、駆動ロータ１と内部ロータ２との相対回転位相をロック位相の方向に付勢するために、ゼンマイバネＳを備えることにより、トーションバネのようにコイル部分に対応するスペースを必要としないので装置の大型化を抑制している。   Thus, in the valve timing control apparatus of the present invention, the spring spring S is provided in order to bias the relative rotational phase of the drive rotor 1 and the internal rotor 2 in the direction of the lock phase, so that the coil is like a torsion spring. Since the space corresponding to the part is not required, the enlargement of the apparatus is suppressed.

このゼンマイバネＳは、外部ロータ１（駆動側回転部材）に対する内部ロータ２（従動側回転部材）の相対回転位相が、最遅角位相からロック位相の近傍までの遅角領域Ａにある場合にのみ相対回転位相でロック位相方向に付勢力を作用させる。これにより、外部ロータ１に対する内部ロータ２の相対回転位相が最遅角位相にある状態でエンジンを始動した場合には、外部ロータ１に対して内部ロータ２をロック位相に達するまでの移動をアシストする。   This spring S is used only when the relative rotational phase of the internal rotor 2 (driven rotational member) with respect to the external rotor 1 (driving rotational member) is in the retardation region A from the most retarded phase to the vicinity of the lock phase. An urging force is applied in the lock phase direction in the relative rotation phase. Thereby, when the engine is started in a state where the relative rotational phase of the internal rotor 2 with respect to the external rotor 1 is at the most retarded phase, the internal rotor 2 is assisted with respect to the external rotor 1 until reaching the lock phase. To do.

そして、外部ロータ１と内部ロータ２との相対回転位相がロック位相を超えて進角領域Ｂにある場合には、ゼンマイバネＳからの付勢力を作用させず、この相対回転を円滑に行わせる。   When the relative rotation phase between the outer rotor 1 and the inner rotor 2 exceeds the lock phase and is in the advance angle region B, the relative rotation is smoothly performed without applying the urging force from the spring spring S.

本発明は、エンジンの吸気弁と排気弁との少なくとも一方の開閉タイミングを設定する弁開閉時期制御装置全般に利用することができる。   The present invention can be used for all valve opening / closing timing control devices for setting the opening / closing timing of at least one of an intake valve and an exhaust valve of an engine.

１ 駆動側回転部材（外部ロータ）
２ 従動側回転部材（内部ロータ）
６Ｔ 支持体・突出面
１０ 軸状体（軸状部）
１０Ｇ 係合凹部
３０ バネ本体
３１ 係合部
３２ 支持部・凹状面
３３ 規制片
３４ 抑制片
Ａ 遅角領域
Ｂ 進角領域
Ｌ ロック機構
Ｓ ゼンマイバネ 1 Drive-side rotating member (external rotor)
2 Driven side rotating member (internal rotor)
6T Support / projecting surface 10 Shaft (shaft)
10G Engagement recess 30 Spring body 31 Engagement part 32 Support part / concave surface 33 Restriction piece 34 Suppression piece A Delay angle area B Advance angle area L Lock mechanism S Spring spring

Claims (6)

内燃機関のクランクシャフトに対して同期回転する駆動側回転部材と、
前記駆動側回転部材に対して相対回転可能に同軸に配置され、前記内燃機関の弁開閉用のカムシャフトに対して一体回転する従動側回転部材と、
前記駆動側回転部材と前記従動側回転部材とにより形成され、容積拡大により前記駆動側回転部材に対する前記従動側回転部材の相対回転位相を遅角方向に移動させる遅角室、および、容積拡大により前記相対回転位相を進角方向に移動させる進角室と、
前記相対回転位相を所定のロック位相で拘束可能なロック機構とを備えると共に、
前記駆動側回転部材に対する前記従動側回転部材の相対回転位相が、最遅角位相から所定位相までの遅角領域において前記所定位相方向に付勢力を作用させ、かつ、前記所定位相から最進角位相において付勢力を作用させないゼンマイバネを備え、
前記駆動側回転部材に固定され、且つ円柱状をなす規制片が備えられ、前記ゼンマイバネは、前記ゼンマイバネの内端を折り曲げて形成された屈曲部でなる係合部を有し、前記相対回転位相が前記遅角領域から前記所定位相に達した際に、前記係合部の折曲げ内面側となる隅部に前記規制片が接当するように前記規制片と前記係合部との位置関係が設定されている弁開閉時期制御装置。 A drive-side rotating member that rotates synchronously with the crankshaft of the internal combustion engine;
A driven-side rotating member that is coaxially disposed so as to be relatively rotatable with respect to the driving-side rotating member, and rotates integrally with a camshaft for opening and closing the valve of the internal combustion engine;
A retardation chamber formed by the drive side rotation member and the driven side rotation member, and moving the relative rotation phase of the driven side rotation member with respect to the drive side rotation member in the retard direction by volume expansion, and by volume expansion An advance chamber that moves the relative rotational phase in an advance direction;
A lock mechanism capable of restraining the relative rotation phase with a predetermined lock phase;
The relative rotational phase of the driven side rotational member with respect to the driving side rotational member causes a biasing force to act in the predetermined phase direction in a retardation region from the most retarded angle phase to the predetermined phase, and the most advanced angle from the predetermined phase. It has a spring spring that does not apply an urging force in the phase ,
A regulating piece that is fixed to the drive-side rotating member and has a cylindrical shape is provided, and the mainspring has an engaging portion that is a bent portion formed by bending an inner end of the mainspring, and the relative rotational phase When the predetermined phase is reached from the retarded angle region, the positional relationship between the restricting piece and the engaging portion is such that the restricting piece comes into contact with the corner on the bent inner surface side of the engaging portion. Is a valve opening and closing timing control device. 前記相対回転位相が、最遅角位相から前記ロック位相までの遅角領域において前記ロック位相方向に付勢力を作用させ、かつ、前記ロック位相から最進角位相において付勢力を作用させない前記ゼンマイバネを備えている請求項１記載の弁開閉時期制御装置。   The spring spring that causes an urging force to act in the lock phase direction in the retardation region from the most retarded phase to the lock phase, and that does not act on the most advanced angle phase from the lock phase. The valve opening / closing timing control device according to claim 1, which is provided. 前記従動側回転部材と一体回転する軸状体の外周に、前記ロック位相から前記最進角位相までの進角領域に対応する領域長となる係合凹部が形成され、
前記ゼンマイバネの内端を折り曲げて形成した前記係合部が前記係合凹部に係入され、前記ゼンマイバネの外端の支持部が前記駆動側回転部材と一体回転する支持体に支持され、
前記係合部が前記係合凹部に係合する方向に前記ゼンマイバネによって付勢されている請求項２記載の弁開閉時期制御装置。 An engagement recess having a region length corresponding to an advance region from the lock phase to the most advanced angle phase is formed on the outer periphery of the shaft-like body that rotates integrally with the driven side rotation member,
Wherein said engaging portion formed by bending the inner end of the spiral spring is engaged into the engaging recess, the support portion of the outer end of the spiral spring is supported on a support which rotates integrally with the driving side rotational member,
The valve opening / closing timing control device according to claim 2, wherein the engagement portion is urged by the mainspring spring in a direction in which the engagement portion engages with the engagement recess. 前記係合部に接当することで前記係合部の前記進角領域の方向への変位を規制する前記規制片が備えられている請求項３記載の弁開閉時期制御装置。 The valve opening / closing timing control device according to claim 3, further comprising: a regulating piece that regulates displacement of the engaging portion in a direction of the advance angle region by contacting the engaging portion. 前記ゼンマイバネのうち前記係合部の近傍部位に接当することで前記ゼンマイバネが膨らむ方向への前記係合部の変位を抑制する抑制片が備えられている請求項３又は４記載の弁開閉時期制御装置。   5. The valve opening / closing timing according to claim 3, further comprising a restraining piece that suppresses displacement of the engaging portion in a direction in which the mainspring spring swells by contacting a portion in the vicinity of the engaging portion of the spring. Control device. 前記支持部が前記ゼンマイバネの中心方向に窪む凹状面で形成され、前記支持体が前記凹状面に嵌り込む突出面で形成され、
前記凹状面と前記係合部とが、バネ本体を半径方向に挟み込む位置に配置されている請求項３〜５のいずれか一項に記載の弁開閉時期制御装置。 The support portion is formed with a concave surface that is recessed in the center direction of the mainspring, and the support is formed with a protruding surface that fits into the concave surface,
The valve opening / closing timing control device according to any one of claims 3 to 5, wherein the concave surface and the engaging portion are arranged at positions where the spring body is sandwiched in the radial direction.
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