US20080245328A1 - Valve Timing Adjusting Device - Google Patents

Valve Timing Adjusting Device Download PDF

Info

Publication number
US20080245328A1
US20080245328A1 US10/575,724 US57572405A US2008245328A1 US 20080245328 A1 US20080245328 A1 US 20080245328A1 US 57572405 A US57572405 A US 57572405A US 2008245328 A1 US2008245328 A1 US 2008245328A1
Authority
US
United States
Prior art keywords
rotor
adjusting device
valve timing
energizing means
timing adjusting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/575,724
Other languages
English (en)
Inventor
Koji Yudate
Akira Sakata
Hiroyuki Kinugawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI DENKI KABUSHIKI KAISHA reassignment MITSUBISHI DENKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KINUGAWA, HIROYUKI, SAKATA, AKIRA, YUDATE, KOJI
Publication of US20080245328A1 publication Critical patent/US20080245328A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • F01L2001/34453—Locking means between driving and driven members
    • 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
    • F01L2001/34453—Locking means between driving and driven members
    • F01L2001/34473—Lock movement perpendicular to camshaft axis
    • 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

Definitions

  • the present invention relates to a valve timing adjusting device that controls opening and closing timings of an intake valve or exhaust valve of an internal combustion engine such as engine (hereinafter, referred to as engine).
  • a conventional valve timing adjusting device is composed of: a first rotor that integrally fixes the following three parts, a housing having the bearing of a camshaft, a case internally having a plurality of shoes projecting therefrom and having hydraulic chambers formed between the shoes, and a cover covering the hydraulic chambers, and the first rotor that rotates integrally with a crank shaft; and a second rotor that has a plurality of vanes each dividing the hydraulic chamber into an advanced-angle hydraulic chamber and a retarded-angle hydraulic chamber, can rotate through a predetermined angle within the first rotor, and is integrally fixed with an intake or exhaust camshaft. It is arranged that these hydraulic chambers be supplied with and exhausted of the oil pressure of an oil pump supplying oil to the sliding portion of the engine, and this oil pressure control the relative position of the second rotor with respect to the first rotor.
  • this type of valve timing adjusting device uses a compression spring or a torsion spring as an energizing means for energizing the second rotor.
  • the compression spring is used therefor, as disclosed by JP-A-2004-150278, for example, (1) a holder is inserted in the shoe of the first rotor or the vane of the second rotor, and the compression spring is placed in a hole formed in the holder; or (2) a groove is formed in the shoe of the first rotor or the vane of the second rotor, and the compression spring is placed in the groove. This groove is usually provided therein on the cover side thereof in consideration of the assembly.
  • Patent Reference JP-A-2004-150278
  • the conventional valve timing adjusting device is arranged as mentioned above. For this reason, when the configuration (1) described above is used, the oil also flows in between the holder and the cover. Thereby, the area in which the cover receives the oil pressure becomes the area of the usual advanced (or retarded)-angle hydraulic chamber, to which the area of the holder is added. As a result, there is a problem that when the cover warped because of an increase of such an oil-pressure receiving area, to thereby make a gap between the cover and the case, the oil leak therebetween is caused.
  • the groove where the compression spring is placed is provided therein on the cover side thereof in view of the assembly. Therefore, there is a problem that in the event that the cover is subjected to the oil-pressure to be warped, similarly to the case of the above configuration (1), there occurs a gap between the cover and the case, which may cause an oil leak therebetween. Moreover, there is a problem that, when the compression spring in the configuration (2) is employed, the seats at the two ends of the spring cannot be held parallel at the time of its expansion and contraction, which may cause the spring to excessively bend to sometimes damage the function of the spring.
  • An object of the present invention is to provide a valve timing adjusting device in which the oil leak caused by the flexure of the cover is prevented and which smoothly operates.
  • the valve timing adjusting device includes: a first rotor that integrally fixes a housing having the bearing of a camshaft, a case internally having a plurality of shoes projecting therefrom and having hydraulic chambers formed between the shoes, and a cover covering the hydraulic chambers, and the first rotor that rotates integrally with a crank shaft; and a second rotor that has a plurality of vanes each dividing the hydraulic chamber into an advanced-angle hydraulic chamber and a retarded-angle hydraulic chamber, can rotate through a predetermined angle within the first rotor, and is integrally fixed with an intake or exhaust camshaft; wherein one end of energizing means for adjusting the relative position between the first rotor and the second rotor is accommodated in the groove provided in the side of the shoe opposite to the housing, and the other-end of the energizing means is accommodated in a holes or a groove provided in the vane of the second rotor.
  • the one end of the energizing means for adjusting the relative position between the first rotor and the second rotor is accommodated in the groove provided in the side of the shoe opposite to the housing, and the other end thereof is accommodated in the groove or hole provided in the vane of the second rotor.
  • the housing has a sufficient thickness and sufficient strength as compared with that of the cover, which never causes an oil leak due to bending or warping of the housing caused by an oil pressure.
  • FIG. 1 is an axial sectional view of the internal configuration of a valve timing adjusting device in accordance with Embodiment 1 of the present invention, taken along the line A-A of FIG. 3 ;
  • FIG. 2 is an axial sectional view of the internal configuration of the valve timing adjusting device in accordance with Embodiment 1 of the present invention, taken along the line B-B of FIG. 5 ;
  • FIG. 3 is a view of the state where a vane rotor assumes the most advanced angle position with respect to a first rotor, taken along the line III-III of FIG. 1 ;
  • FIG. 4 is a view of the state where the vane rotor assumes the most retarded angle position with respect to the first rotor, taken along the line IV-IV of FIG. 1 ;
  • FIG. 5 is a view of the state where the vane rotor assumes the most advanced angle position with respect to the first rotor, taken along the line V-V of FIG. 1 ;
  • FIG. 6 is a view of the state where the vane rotor assumes the most retarded angle position with respect to the first rotor, taken along the line VI-VI of FIG. 1 .
  • FIG. 1 is an axial sectional view of the internal configuration of a valve timing adjusting device in accordance with Embodiment 1 of the present invention, taken along the line A-A of FIG. 3 , which is later described.
  • FIG. 2 is an axial sectional view thereof taken along the line B-B of FIG. 5 , later described.
  • FIG. 3 is a radial sectional view of the state where a second rotor assumes the most advanced angle position with respect to a first rotor, taken along the line III-III of FIG. 1 .
  • FIG. 4 is a radial sectional view of the state where the second rotor assumes the most retarded angle position with respect to the first rotor, taken along the line IV-IV of FIG. 1 .
  • FIG. 5 is a radial sectional view of the state where the second rotor assumes the most advanced angle position with respect to the first rotor, taken along the line V-V of FIG. 1 .
  • FIG. 6 is a radial sectional view of the state where the second rotor assumes the most retarded angle position with respect to the first rotor, taken along the line VI-VI of FIG. 1 .
  • the valve timing adjusting device 1 is generally composed of, as shown in FIG. 1 to FIG. 6 , a first rotor 3 that rotates synchronizingly with the crankshaft (not shown) of the engine (not shown) through a chain (not shown); a second rotor 7 that is disposed within this first rotor 3 , and is integrally secured on the end face of an intake or exhaust camshaft (hereinafter referred to as simply the camshaft) 5 ; and an assisting spring (energizing member) 9 for adjusting the relative rotation between this second rotor 7 and the first rotor 3 .
  • the first rotor 3 is generally composed of a housing 11 that externally has a sprocket 11 a receiving the rotational driving force of the crankshaft (not shown), and that internally has a bearing (not shown) slidingly contacting the outer peripheral surface located in the vicinity of the end face of the camshaft 5 ; a case 13 that is disposed adjacently to this housing 11 , and that internally has a plurality of shoes 13 a (three shoes as shown in FIG. 3 to FIG. 6 ), which radially inwardly project to form a plurality of spaces; and a cover 15 that covers the internal space of this case 13 , where these three parts are integrally fastened to each other with a bolt 17 .
  • the second rotor 7 is a rotor having a boss 7 a integrally fastened on the end face of the camshaft 5 , which rotates in the direction shown by the arrow, with a bolt 19 through a washer 18 , and a plurality of vanes 7 b radially outwardly projecting from the periphery of this boss 7 a (hereinafter the second rotor 7 is also referred to as vane rotor 7 ).
  • Each of the vanes 7 b of the vane rotor 7 partitions each of a plurality of internal spaces formed by the shoes 13 a of the case 13 into an advanced-angle hydraulic chamber 21 that receives the supply of the oil pressure when the vane rotor 7 is relatively rotated in the direction of the advanced angle side with respect to the first rotor 3 and an retarded-angle hydraulic chamber 23 that receives the supply of the oil pressure when the vane rotor 7 is relatively rotated in the direction of the retarded angle side with respect to the first rotor 3 .
  • One end of a second oil passage 27 formed in the interior of the camshaft 5 is connected to each advanced-angle hydraulic chamber 21 , while one end of a first oil passage 25 similarly formed in the interior of the camshaft 5 is connected to each of the retarded-angle hydraulic chambers 23 .
  • Each of the other ends of the first oil passage 25 and the second oil passage 27 leads to an oil pump (not shown) and an oil pan (not shown) through an oil-controlling valve (not shown, and hereinafter referred to as OCV).
  • a accommodating hole 29 penetrating the shoe in a radial direction of the device is formed in one shoe 13 a of the case 13 provided in this valve timing adjusting device 1 .
  • a generally cylindrical lock pin 31 is disposed reciprocally slidably along an axial direction of the accommodating hole.
  • a bottomed hole 31 a is formed at the bottom of the lock pin 31 , which is located on the outside in the radial direction of the pin.
  • a stopper 33 is inserted into this accommodating hole 29 from the outside of the radial direction, and the stopper is fixed therein by a shaft 35 .
  • the stopper 33 has a bottomed hole 33 a inside in the radial direction, and at the bottom of the bottomed hole 33 a , there is provided a back-pressure exhausting hole 37 that causes the space within the accommodating hole 29 , which axially penetrates the hole and is located behind the lock pin 31 , to communicate to the atmosphere.
  • a coil spring 39 for always energizing the lock pin 31 inwardly in a radial direction is provided between the bottomed hole 31 a of the lock pin 31 and the bottomed hole 33 a of the stopper 33 .
  • an engaging hole 41 is formed such that the lock pin 31 is advanced inwardly in the radial direction to be engaged by the energizing force of the coil spring 39 when the relative position of the vane rotor 7 with respect to the case 13 is positioned at the most advanced angle position.
  • a lock-releasing oil passage 42 is provided between this engaging hole 41 and the second oil passage 27 .
  • sealing means 45 respectively, for preventing the flow of oil between the advanced-angle hydraulic chamber 21 and the retarded-angle hydraulic chamber 23 ; however, the oil flow may be prevented by reducing the clearances to an extremely small distance.
  • the first rotor 3 and the second rotor 7 in the lock-releasing state are allowed to relatively rotate to the retarded angle side by a predetermined rotation angle against the energizing force of the assisting spring 9 (return force to stationary state) by the retarded-angle oil pressure supplied to the retarded-angle hydraulic chamber 23 at that time.
  • the energizing means adjusting the relative position between the first rotor and the vane rotor be accommodated in the groove provided in the side of the shoe opposite to the housing, and the other end thereof be accommodated in the groove or hole provided in the vane of the vane rotor.
  • the housing has a sufficient thickness and sufficient strength as compared with that of the cover, and the oil pressure does not bend the housing, nor cause the oil leak.
  • the area in which the cover receives the oil pressure does not increase, thereby alleviating the bending of the cover and reducing the oil leak.
  • the area where the cover receives the oil pressure does not increase, thereby enabling the thin cover or the cover having low strength be used for the valve timing adjusting device.
  • the hole accommodating the assisting spring is provided in the side of the vane; however, if a groove accommodating the assisting spring is provided in the opposite side of the vane from the housing as in the case where the groove accommodating the assisting spring is provided in the shoe, the effect similar to the above-mentioned one can be obtained. Besides, the provision of the groove improves the assembly of the assisting spring as compared with the case of providing the hole accommodating the assisting spring.
  • the assisting spring is arranged to have the maximum length and become straight at the most advanced angle position, thereby reducing the flexure of the assisting spring. Furthermore, when the assisting spring in the most retarded angle position is maximally compressed, the clearance is arranged to be created between the shoe of the first rotor and the vane of the second rotor. This can prevent the assisting spring from bending, and can give the spring freedom to smoothly bend. Moreover, this clearance therebetween can provide the device with constant communication through the oil passage.
  • Embodiment 1 Three assisting springs are used in Embodiment 1; however, in Embodiment 2, these three assisting springs 9 are arranged to be equally loaded, and to be substantially equiangularly disposed. This configuration can bring the total of the moments due to the fall of the vane rotor 7 close to zero, and can prevent the vane rotor 7 , which is orthogonal to the axis, from falling.
  • valve timing adjusting device is suitable for preventing the oil leak caused by the flexure of the cover, smoothly operating the device, and controlling opening and closing timings of the intake valve or the exhaust valve of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US10/575,724 2004-08-27 2005-06-08 Valve Timing Adjusting Device Abandoned US20080245328A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004248903A JP4327047B2 (ja) 2004-08-27 2004-08-27 バルブタイミング調整装置
JP2004-248903 2004-08-27
PCT/JP2005/010503 WO2006022065A1 (fr) 2004-08-27 2005-06-08 Dispositif de reglage du reglage de distribution

Publications (1)

Publication Number Publication Date
US20080245328A1 true US20080245328A1 (en) 2008-10-09

Family

ID=35967286

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/575,724 Abandoned US20080245328A1 (en) 2004-08-27 2005-06-08 Valve Timing Adjusting Device

Country Status (4)

Country Link
US (1) US20080245328A1 (fr)
JP (1) JP4327047B2 (fr)
DE (1) DE112005000050T5 (fr)
WO (1) WO2006022065A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120167846A1 (en) * 2009-09-25 2012-07-05 Hirofumi Hase Valve timing regulator
US20120285407A1 (en) * 2011-05-10 2012-11-15 Hitachi Automotive Systems, Ltd. Variable valve timing control apparatus of internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009215881A (ja) * 2006-07-05 2009-09-24 Mitsubishi Electric Corp バルブタイミング調整装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010027763A1 (en) * 1999-12-28 2001-10-11 Simpson Roger T. Multi-position variable camshaft timing system actuated by engine oil pressure
US6450138B1 (en) * 2000-01-25 2002-09-17 Mitsubishi Denki Kabushiki Kaisha Valve timing adjusting device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415706U (fr) * 1987-07-20 1989-01-26
JPH0250106U (fr) * 1988-09-30 1990-04-09
JP2001248411A (ja) * 2000-03-03 2001-09-14 Mitsubishi Electric Corp バルブタイミング調整装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010027763A1 (en) * 1999-12-28 2001-10-11 Simpson Roger T. Multi-position variable camshaft timing system actuated by engine oil pressure
US6450138B1 (en) * 2000-01-25 2002-09-17 Mitsubishi Denki Kabushiki Kaisha Valve timing adjusting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120167846A1 (en) * 2009-09-25 2012-07-05 Hirofumi Hase Valve timing regulator
US20120285407A1 (en) * 2011-05-10 2012-11-15 Hitachi Automotive Systems, Ltd. Variable valve timing control apparatus of internal combustion engine

Also Published As

Publication number Publication date
JP4327047B2 (ja) 2009-09-09
DE112005000050T5 (de) 2006-08-03
WO2006022065A1 (fr) 2006-03-02
JP2006063920A (ja) 2006-03-09

Similar Documents

Publication Publication Date Title
US6439184B1 (en) Valve timing adjusting system of internal combustion engine
US6758178B2 (en) Valve timing control device
US7406935B2 (en) Variable valve timing control apparatus of internal combustion engine
US9133734B2 (en) Valve timing control apparatus for internal combustion engine
EP2302177B1 (fr) Dispositif de commande variable d'ouverture/fermeture de soupape
US7234427B2 (en) Locking device for a camshaft adjuster
US7100555B2 (en) Valve timing controller
JP5403341B2 (ja) 弁開閉時期制御装置
CN113614337B (zh) 工作油控制阀和阀正时调整装置
US8555837B2 (en) Stepped rotor for camshaft phaser
US20010003974A1 (en) Valve timing adjuster for internal combustion engine
US8955479B2 (en) Variable valve timing control apparatus of internal combustion engine and method for assembling the same
JP2009185766A (ja) バルブタイミング調整装置
US6994062B2 (en) Variable valve timing control device
US20100089349A1 (en) Valve Timing Adjusting Device
US7146946B2 (en) Valve timing adjusting device
EP1500796B1 (fr) Déphaseur d'arbre à cames
US7066122B2 (en) Variable valve timing controller
US20080245328A1 (en) Valve Timing Adjusting Device
US20120167846A1 (en) Valve timing regulator
US8869762B2 (en) Fluid-pressure-operated valve timing controller
US6595173B2 (en) Variable valve timing controller
JP2003286815A (ja) 弁開閉時期制御装置
JP4238486B2 (ja) バルブタイミング調整装置
JP2011220137A (ja) 内燃機関のバルブタイミング制御装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: MITSUBISHI DENKI KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YUDATE, KOJI;SAKATA, AKIRA;KINUGAWA, HIROYUKI;REEL/FRAME:017799/0231

Effective date: 20060127

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION