EP2927440A1 - Déphaseur d'arbre à cames - Google Patents
Déphaseur d'arbre à cames Download PDFInfo
- Publication number
- EP2927440A1 EP2927440A1 EP15161161.3A EP15161161A EP2927440A1 EP 2927440 A1 EP2927440 A1 EP 2927440A1 EP 15161161 A EP15161161 A EP 15161161A EP 2927440 A1 EP2927440 A1 EP 2927440A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- engine
- seal
- cover
- camshaft phaser
- 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.)
- Withdrawn
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Classifications
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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
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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
- F01L1/02—Valve drive
- F01L1/024—Belt drive
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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
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0476—Camshaft bearings
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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
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/3443—Solenoid driven oil control valves
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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
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/34433—Location oil control valves
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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
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34479—Sealing of phaser devices
Definitions
- the present invention relates to an internal combustion engine with a camshaft phaser which uses pressurized oil to vary the phase relationship between a crankshaft and a camshaft of the internal combustion engine; more particularly to such an internal combustion engine which includes a drive belt for transmitting rotational motion from the crankshaft to the camshaft; and still even more particularly to such an internal combustion engine which includes a sealing arrangement to seal the drive belt from the oil used to vary the phase relationship between the crankshaft and the camshaft.
- a typical vane-type camshaft phaser for changing the phase relationship between a crankshaft and a camshaft of an internal combustion engine generally comprises a plurality of outwardly-extending vanes on a rotor interspersed with a plurality of inwardly-extending lobes on a stator, forming alternating advance and retard chambers between the vanes and lobes.
- Engine oil is selectively supplied to either the advance chambers or the retard chambers and vented from the other of the advance and retard chambers in order to rotate the rotor within the stator and thereby change the phase relationship between the camshaft and the crankshaft.
- camshaft phasers include a valve spool within the camshaft phaser in order to selectively supply and vent oil to and from the advance and retard chambers as necessary in order to achieve the desired phase relationship between the camshaft and the crankshaft.
- a valve spool within the camshaft phaser in order to selectively supply and vent oil to and from the advance and retard chambers as necessary in order to achieve the desired phase relationship between the camshaft and the crankshaft.
- an internal combustion engine includes a crankshaft rotatable about a crankshaft axis and a camshaft rotatable by the crankshaft about a camshaft axis.
- the internal combustion engine also includes an oil supply, an engine cover, and a drive member disposed within the engine cover for transferring rotational motion from the crankshaft to the camshaft.
- a camshaft phaser is disposed within the engine cover for controllably varying the phase relationship between the crankshaft and the camshaft.
- the camshaft phaser includes an input member driven by the drive member, an output member rotatable with the camshaft wherein the output member is rotatable relative to the input member by oil from the oil supply thereby varying the phase relationship between the crankshaft and the camshaft, and a valve spool within the camshaft phaser and moveable therein between 1) an advance position to direct oil from the oil supply to cause the input member to rotate relative to the output member to advance the camshaft relative to the crankshaft and 2) a retard position to direct oil from the oil supply to cause the input member to rotate relative to the output member to retard the camshaft relative to the crankshaft.
- An actuator moves the valve spool between the advance position and the retard position and a sealing arrangement defines a dry zone with one of the engine cover and the actuator to isolate the drive member from oil used to rotate the output member relative to the input member.
- the input member is a stator having a plurality of lobes.
- the output member is a rotor disposed within the stator.
- the rotor has a plurality of vanes interspersed with the lobes.
- the rotor is rotatable within the stator about the camshaft axis and defining alternating advance chambers and retard chambers.
- the advance chambers also receive oil in order to change the phase relationship between the crankshaft and the camshaft in an advance direction.
- the retard chambers receive oil in order to change the phase relationship between the camshaft and the crankshaft in a retard direction.
- the camshaft phaser further comprises a front cover closing off one end of the stator.
- the sealing arrangement further comprises an engine cover to camshaft phaser seal to seal between the engine cover and the front cover or between the actuator and the front cover.
- the engine cover to camshaft phaser seal is a radial seal.
- the camshaft phaser rotates relative to the engine cover to camshaft phaser seal.
- the engine cover also includes a ring-shaped engine cover seal support extending axially from the engine cover toward the camshaft phaser and the engine cover to camshaft phaser seal is fixed to the engine cover seal support.
- the front cover includes a ring-shaped front cover sealing body extending axially from the front cover toward the engine cover such that the engine cover to camshaft phaser seal seals against the front cover sealing body.
- the camshaft phaser further comprises a back cover closing off the other end of said stator, the back cover including a back cover central bore extending axially therethrough.
- the internal combustion engine comprises a camshaft support which supports said camshaft.
- the sealing arrangement further comprises an engine to camshaft phaser seal to seal between the camshaft phaser and the camshaft support.
- the engine to camshaft phaser seal is a radial seal. Further the camshaft phaser rotates relative to the engine to camshaft phaser seal.
- the camshaft support defines a camshaft support bore and the engine to camshaft phaser seal is located within the camshaft support bore.
- the back cover also includes a ring-shaped back cover sealing body extending axially from the back cover into the camshaft support bore such that the engine to camshaft phaser seal seals against said back cover sealing body.
- the engine cover to camshaft phaser seal is fixed to the actuator.
- the actuator also includes an actuator seal bore extending axially into the actuator and the engine cover to camshaft phaser seal is fixed within the actuator seal bore.
- an internal combustion engine has a crankshaft rotatable about a crankshaft axis and a camshaft rotatable by the crankshaft about a camshaft axis.
- the internal combustion engine also comprises an oil supply, an engine cover, a drive member disposed within the engine cover for transferring rotational motion from the crankshaft to the camshaft, a camshaft phaser disposed within the engine cover for controllably varying the phase relationship between the crankshaft and the camshaft.
- the camshaft phaser also comprises an input member driven by the drive member, an output member rotatable with the camshaft.
- the output member is rotatable relative to the input member by oil from the oil supply, thereby varying the phase relationship between the crankshaft and the camshaft and a valve spool within the camshaft phaser and moveable therein for directing oil from the oil supply.
- the camshaft phaser also comprises an actuator for moving the valve spool and a sealing arrangement defining a dry zone with one of the engine cover and the actuator to isolate the drive member from oil directed by the valve spool.
- the input member is a stator having a plurality of lobes.
- the output member is a rotor disposed within the stator, the rotor having a plurality of vanes interspersed with the lobes) such that the rotor is rotatable within the stator about the camshaft axis and defining alternating advance chambers and retard chambers.
- the advance chambers also receive oil in order to change the phase relationship between the crankshaft and the camshaft in an advance direction and the retard chambers receive oil in order to change the phase relationship between the camshaft and the crankshaft in a retard direction.
- the camshaft phaser further comprises a front cover closing off one end of the stator.
- the sealing arrangement comprises an engine cover to camshaft phaser seal to seal between the engine cover and the front cover or between the actuator and the front cover.
- the engine cover also includes a ring-shaped engine cover seal support extending axially from the engine cover toward the camshaft phaser and the engine cover to camshaft phaser seal is fixed to the engine cover seal support.
- the front cover includes a ring-shaped front cover sealing body extending axially from the front cover toward the engine cover.
- the engine cover to camshaft phaser seal seals against the front cover sealing body.
- the camshaft phaser further comprises a back cover closing off the other end of the stator.
- the back cover includes a back cover central bore extending axially therethrough.
- the internal combustion engine further comprises a camshaft support which supports the camshaft and the sealing arrangement further comprising an engine to camshaft phaser seal to seal between the camshaft phaser and the camshaft support.
- the camshaft support defines a camshaft support bore and the engine to camshaft phaser seal is located within the camshaft support bore.
- the back cover includes a ring-shaped back cover sealing body extending axially from the back cover into the camshaft support bore such that the engine to camshaft phaser seal seals against the back cover sealing body.
- the engine cover to camshaft phaser seal is fixed to the actuator.
- the actuator also includes an actuator seal bore extending axially into the actuator and the engine cover to camshaft phaser seal is fixed within the actuator seal bore.
- Internal combustion engine 10 generally includes one or more pistons (not shown), a crankshaft 12 which rotates about a crankshaft axis 14, a camshaft 16 which is supported in a camshaft support 18 and rotates about a camshaft axis 20, and a camshaft phaser 22 which rotates about camshaft axis 20.
- Internal combustion engine 10 may be, for example only, spark ignited or compression ignited and may be fueled by any liquid fuel or gaseous fuel customarily used, for example only, liquid fuels such as gasoline, diesel fuel, alcohol, ethanol, and the like and blends thereof or gaseous fuels such as natural gas, propane, and the like.
- crankshaft 12 The pistons, which are connected to crankshaft 12, reciprocate as a result of combustion of the fuel within the respective combustion chambers (not shown). Reciprocation of the pistons causes crankshaft 12 to rotate about crankshaft axis 14.
- Crankshaft 12 includes a crankshaft pulley 24 which may be toothed as shown and which rotates a drive member 26, for example, drive belt which is toothed to mate with crankshaft pulley 24.
- Camshaft phaser 22 is rotated by drive member 26 and is connected to camshaft 16, consequently, camshaft 16 rotates about camshaft axis 20 as a result of crankshaft 12. Rotation of camshaft 16 about camshaft axis 20 causes one or more combustion valves (not shown) to open and close.
- Camshaft phaser 22 allows the phase of rotation of camshaft 16 relative to crankshaft 12 to be varied, thereby varying the timing of opening and/or closing of the combustion valves relative to crankshaft 12 as will be described in greater detail later.
- An engine cover 28 encloses crankshaft pulley 24, drive member 26, and camshaft phaser 22.
- camshaft phaser 22 uses pressurized oil to change the phase relationship of camshaft 16 relative to crankshaft 12. As shown, camshaft phaser 22 is what is commonly referred to in the art as a vane-type camshaft phaser.
- Camshaft phaser 22 generally includes a stator 30 which acts as an input member, a rotor 32 which acts as an output member and which is disposed coaxially within stator 30, a back cover 34 closing off one end of stator 30, a front cover 36 closing off the other end of stator 30, a camshaft phaser attachment bolt 40 for attaching camshaft phaser 22 to camshaft 16, and a valve spool 42 for controlling oil as will be described later which is supplied by an oil supply 44 of internal combustion engine 10.
- An actuator 46 is provided for positioning valve spool 42 to achieve a desired rotational position of rotor 32 relative to stator 30 as will also be described later.
- Stator 30 is generally cylindrical and includes a plurality of radial chambers 48 (only one radial chamber 48 is labeled in Fig. 1 ) defined by a plurality of lobes 50 extending radially inward. In the embodiment shown, there are four lobes 50 defining four radial chambers 48, however, it is to be understood that a different number of lobes 50 may be provided to define radial chambers 48 equal in quantity to the number of lobes 50.
- Stator 30 may also include a camshaft phaser pulley 52 which is toothed as shown and formed integrally therewith or otherwise fixed thereto. Camshaft phaser pulley 52 is configured to be driven by drive member 26. While the drive arrangement between crankshaft 12 and camshaft phaser 22 has been illustrated as using pulleys and a belt, it should now be understood that other drive arrangements may be used, for example only, sprockets and a chain or gears.
- Rotor 32 includes a central hub 54 with a plurality of vanes 56 extending radially outward therefrom and a central through bore 58 extending axially therethrough.
- the number of vanes 56 is equal to the number of radial chambers 48 provided in stator 30.
- Rotor 32 is coaxially disposed within stator 30 such that each vane 56 divides each radial chamber 48 into advance chambers 60 and retard chambers 62.
- the radial tips of lobes 50 are mateable with central hub 54 in order to separate radial chambers 48 from each other.
- Each of the radial tips of lobes 50 and the tips of vanes 56 may include one of a plurality of wiper seals 64 to substantially seal adjacent advance chambers 60 and retard chambers 62 from each other.
- Back cover 34 is sealingly secured, using cover bolts 66, to the axial end of stator 30 that is proximal to camshaft 16.
- a back cover seal 68 for example only, an o-ring, may be provided between back cover 34 and stator 30 in order to provide an oil-tight seal between the interface of back cover 34 and stator 30. Tightening of cover bolts 66 prevents relative rotation between back cover 34 and stator 30.
- Back cover 34 includes a back cover central bore 70 extending coaxially therethrough. The end of camshaft 16 is received coaxially within back cover central bore 70 such that camshaft 16 is allowed to rotate relative to back cover 34.
- camshaft phaser pulley 52 may be integrally formed or otherwise attached to back cover 34 rather than to stator 30 as described previously.
- front cover 36 is sealingly secured, using cover bolts 66, to the axial end of stator 30 that is opposite back cover 34.
- a front cover seal 72 for example only, an o-ring, may be provided between front cover 36 and stator 30 in order to provide an oil-tight seal between the interface of front cover 36 and stator 30.
- Cover bolts 66 pass through back cover 34 and stator 30 and threadably engage front cover 36, thereby clamping stator 30 between back cover 34 and front cover 36 to prevent relative rotation between stator 30, back cover 34, and front cover 36. In this way, advance chambers 60 and retard chambers 62 are defined axially between back cover 34 and front cover 36.
- Camshaft phaser 22 is attached to camshaft 16 with camshaft phaser attachment bolt 40 which extends coaxially through central through bore 58 of rotor 32 and threadably engages camshaft 16, thereby clamping rotor 32 securely to camshaft 16. In this way, relative rotation between stator 30 and rotor 32 results in a change in phase relationship or timing between crankshaft 12 and camshaft 16.
- pressurized oil is selectively supplied to advance chambers 60 and vented from retard chambers 62 in order to cause relative rotation between stator 30 and rotor 32 which results in advancing the timing of camshaft 16 relative to crankshaft 12.
- oil is selectively supplied to retard chambers 62 and vented from advance chambers 60 in order to cause relative rotation between stator 30 and rotor 32 which results in retarding the timing of camshaft 16 relative to crankshaft 12.
- Advance oil passages 74 may be provided in rotor 32 for supplying and venting oil to and from advance chambers 60 while retard oil passages 76 may be provided in rotor 32 for supplying and venting oil to and from retard chambers 62.
- Supplying and venting of oil to and from advance chambers 60 and retard chambers 62 is controlled by valve spool 42, as will be discussed in the paragraphs that follow, which is coaxially disposed slidably within a valve bore 78 of camshaft phaser attachment bolt 40 such that valve bore 78 is centered about camshaft axis 20.
- Oil supply 44 provides a supply of pressurized oil to valve spool 42 through radial camshaft passages 80 which communicate with a camshaft counterbore 82 which forms a camshaft annular oil passage 84 with a portion of camshaft phaser attachment bolt 40.
- the oil then passes from camshaft annular oil passage 84 to an axial rotor oil passage 86 which extends axially into rotor 32.
- the oil is subsequently communicated to an annular rotor oil supply groove 88 which extends radially outward from central through bore 58 and intersects axial rotor oil supply passage 86.
- Annular rotor oil supply groove 88 is axially aligned with bolt oil supply passages 90 which extend radially through camshaft phaser attachment bolt 40 from valve bore 78. In this way, oil from oil supply 44 is supplied to valve spool 42.
- Valve spool 42 includes a body 92 that is generally cylindrical, hollow, and dimensioned to provide annular clearance between body 92 and valve bore 78 of camshaft phaser attachment bolt 40.
- Valve spool 42 also includes an advance land 94 extending radially outward from body 92 for selectively blocking fluid communication between bolt oil supply passages 90 and advance bolt passages 96 which extend radially outward through camshaft phaser attachment bolt 40 from valve bore 78 and communicate with advance oil passages 74 of rotor 32 through an annular rotor advance oil groove 98 which extends radially outward from central through bore 58.
- Valve spool 42 also includes a retard land 100 extending radially outward from body 92 for selectively blocking fluid communication between bolt oil supply passages 90 and retard bolt passages 102 which extend radially outward through camshaft phaser attachment bolt 40 from valve bore 78 and communicate with retard oil passages 76 of rotor 32 through an annular rotor retard oil groove 104 which extends radially outward from central through bore 58.
- Retard land 100 is spaced axially from advance land 94 and fits within valve bore 78 of camshaft phaser attachment bolt 40 in a close fitting relationship to substantially prevent oil from passing between retard land 100 and valve bore 78.
- Valve spool 42 is axially moveable within valve bore 78 with input from actuator 46 and a spool spring 106 which is positioned axially between valve spool 42 and the bottom of valve bore 78.
- actuator 46 When actuator 46 is in an unenergrized state of operation as shown in Fig. 4B , valve spool 42 is positioned in a retard position, by force of spool spring 106, to allow pressurized oil to be supplied to retard chambers 62 as shown by arrows P.
- oil within advance chambers 60 is allowed to be vented through a central passage 108 formed coaxially through valve spool 42 and then out through the end of valve bore 78 as shown by arrows V.
- valve spool 42 is positioned in an advance position, by force from actuator 46 overcoming force of spool spring 106, to allow pressurized oil to be supplied to advance chambers 60 as shown by arrows P.
- oil within retard chambers 62 is allowed to be vented through the end of valve bore 78 as shown by arrows V.
- Drive member 26 may not be compatible with the oil supplied to camshaft phaser 22, consequently, a dry zone 110 may be formed within engine cover 28.
- Drive member 26 is located within dry zone 110 which is substantially free of the oil supplied to camshaft phaser 22.
- Dry zone 110 is formed by a sealing arrangement which may comprise an engine cover to camshaft phaser seal 112 and an engine to camshaft phaser seal 114. The sealing arrangement will be described in greater detail in the paragraphs that follow.
- engine cover to camshaft phaser seal 112 provides a seal between engine cover 28 and front cover 36.
- Engine cover 28 includes an engine cover seal support 116 which is ring-shaped and substantially centered about camshaft axis 20.
- Engine cover seal support 116 extends axially away from engine cover 28 toward camshaft phaser 22 into dry zone 110.
- Engine cover to camshaft phaser seal 112 includes an engine cover to camshaft phaser seal supporting body 118 which is ring shaped and secured coaxially within engine cover seal support 116, for example, by a press fit.
- engine cover to camshaft phaser seal supporting body 118 may be secured to engine cover seal support 116 by surrounding engine cover seal support 116, i.e. the radial relationship between engine cover to camshaft phaser seal supporting body 118 and engine cover seal support 116 may be reversed from the relationship shown in the figures.
- Engine cover to camshaft phaser seal supporting body 118 may be made of a rigid material, for example, metal or plastic.
- Engine cover to camshaft phaser seal 112 also includes an engine cover to camshaft phaser seal lip seal 120 which extends radially inward from engine cover to camshaft phaser seal supporting body 118.
- Engine cover to camshaft phaser seal lip seal 120 may be molded and bonded to engine cover to camshaft phaser seal supporting body 118 and may be made of an elastomeric or rubber-like material, for example only, Nitrile Butadiene Rubber (NBR), Viton®, or silicone.
- Front cover 36 includes a front cover sealing body 122 for radially mating with engine cover to camshaft phaser seal lip seal 120.
- Front cover sealing body 122 may include a sleeve (not show) in a radially surrounding relationship which provides the necessary harness and surface finish to withstand rubbing with respect to engine cover to camshaft phaser seal lip seal 120, however, the sleeve may be omitted as shown if front cover sealing body 122 is made from a material of adequate hardness and surface finish.
- Front cover sealing body 122 is ring-shaped and extends axially away from front cover 36 toward engine cover 28 in a coaxial relationship with engine cover seal support 116.
- Front cover sealing body 122 is sized to elastically deform engine cover to camshaft phaser seal lip seal 120 when assembled in order to provide an oil-tight seal between front cover sealing body 122 and engine cover to camshaft phaser seal lip seal 120.
- Engine cover to camshaft phaser seal lip seal 120 is sized to provide sufficient compliance to accommodate mismatch in concentricity between engine cover to camshaft phaser seal 112 and front cover sealing body 122 due to manufacturing tolerances. In this way, oil that is vented from advance chambers 60 and retard chambers 62 through the end of valve bore 78 is prevented from entering dry zone 110 as camshaft phaser 22 rotates with respect to engine cover to camshaft phaser seal 112 in operation.
- engine cover to camshaft phaser seal 112 may include a dust seal lip which protects engine cover to camshaft phaser seal lip seal 120 from external contamination that may have undesirable effects on engine cover to camshaft phaser seal lip seal 120.
- Engine to camshaft phaser seal 114 provides a seal between camshaft support 18 and back cover 34.
- a camshaft support bore 124 which is cylindrical, extends into camshaft support 18 in a coaxial relationship with camshaft 16.
- Engine to camshaft phaser seal 114 includes an engine to camshaft phaser seal supporting body 126 which is ring shaped and secured coaxially within camshaft support bore 124, for example, by a press fit.
- Engine to camshaft phaser seal supporting body 126 may be made of a rigid material, for example, metal or plastic.
- Engine to camshaft phaser seal 114 also includes an engine to camshaft phaser seal lip seal 128 which extends radially inward from engine to camshaft phaser seal supporting body 126.
- Engine to camshaft phaser seal lip seal 128 may be molded and bonded to engine to camshaft phaser seal supporting body 126 and may be made of an elastomeric or rubber-like material, for example only, Nitrile Butadiene Rubber (NBR), Viton®, or silicone.
- Engine to camshaft phaser seal 114 may also include an engine to camshaft phaser seal dust lip seal 130 which extends radially inward from engine to camshaft phaser seal supporting body 126 and may be made from the same material as engine to camshaft phaser seal lip seal 128.
- Engine to camshaft phaser seal dust lip seal 130 protects engine to camshaft phaser seal lip seal 128 from external contamination that may have undesirable effects on engine to camshaft phaser seal lip seal 128.
- Back cover 34 includes a back cover sealing body 132 for radially mating with engine to camshaft phaser seal lip seal 128.
- Back cover sealing body 132 is ring-shaped and extends axially away from back cover 34 into camshaft support bore 124 in a coaxial relationship with camshaft support bore 124.
- Back cover sealing body 132 is sized to elastically deform engine to camshaft phaser seal lip seal 128 when assembled in order to provide an oil-tight seal between back cover sealing body 132 and engine to camshaft phaser seal lip seal 128.
- Engine cover 28 includes an engine cover bore 134 extending therethrough in a substantially coaxial relationship with camshaft 16.
- Actuator 46 is received coaxially within engine cover bore 134 and is fixed to engine cover 28 to prevent relative rotation between engine cover 28 and actuator 46.
- An engine cover to actuator seal 136 which may be an O-ring as shown, is disposed between actuator 46 and engine cover 28. In this way, oil that is vented from advance chambers 60 and retard chambers 62 through the end of valve bore 78 is prevented from exiting engine cover 28 between the interface of engine cover 28 and actuator 46.
- engine cover to actuator seal 136 is a static seal, unlike engine cover to camshaft phaser seal 112 and engine to camshaft phaser seal 114 which are dynamic seals, since there is no relative movement between engine cover 28 and actuator 46.
- a rotor drain passage 138 is provided axially through central hub 54 of rotor 32 in order to return oil to oil supply 44 that is vented from advance chambers 60 and retard chambers 62 through the end of valve bore 78.
- a washer 140 that is captured axially between camshaft phaser attachment bolt 40 and rotor 32 may include a notch 142 therethrough to allow the vented oil to enter rotor drain passage 138.
- rotor drain passage 138 that is proximal to camshaft 16 and is prevented from entering dry zone 110 by engine to camshaft phaser seal 114 and is subsequently returned to oil supply 44. It should be noted that rotor drain passage 138 and notch 142 are also present in the other figures, however, are not visible because of the particular sections that are shown.
- engine cover to camshaft phaser seal 112 may be fixed to actuator 46' rather than to engine cover 28'.
- Actuator 46' includes an actuator seal bore 144 which is substantially coaxial with camshaft 16.
- Engine cover to camshaft phaser seal 112 may be secured coaxially within actuator seal bore 144, for example, by press fit.
- actuator 46" may be provided which is integrally housed as part of engine cover 28".
- Engine cover to camshaft phaser seal 112 may be supported by engine cover seal support 116" which is configured similar to engine cover seal support 116 as described previously.
- camshaft phaser 22 may include a bias spring that either partially or completely offsets the natural retarding torque induced by the overall valve train friction, balances performance times, or helps return the phaser to a default position of rotor 32 within stator 30.
- the bias spring may be grounded at one end thereof to front cover 36 and may be attached at the other end thereof to rotor 32 for biasing rotor 32 relative to stator 30.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/242,107 US20150275707A1 (en) | 2014-04-01 | 2014-04-01 | Camshaft phaser |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2927440A1 true EP2927440A1 (fr) | 2015-10-07 |
Family
ID=53058969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15161161.3A Withdrawn EP2927440A1 (fr) | 2014-04-01 | 2015-03-26 | Déphaseur d'arbre à cames |
Country Status (2)
Country | Link |
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US (1) | US20150275707A1 (fr) |
EP (1) | EP2927440A1 (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017162233A1 (fr) * | 2016-03-23 | 2017-09-28 | Schaeffler Technologies AG & Co. KG | Système de déphasage d'arbre à cames comprenant des moyens de collecte de fluide hydraulique s'écoulant d'une soupape pour le retour direct dans le déphaseur d'arbre à cames |
FR3061930A1 (fr) * | 2017-01-17 | 2018-07-20 | Peugeot Citroen Automobiles Sa | Arbre a cames de moteur thermique |
DE102017116732A1 (de) | 2017-07-25 | 2018-08-16 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller zur variablen Einstellung der Ventilsteuerzeiten einer Brennkraftmaschine und Anordnung zur Abdichtung eines Nockenwellenverstellers |
WO2018206281A1 (fr) * | 2017-05-11 | 2018-11-15 | Volkswagen Aktiengesellschaft | Moteur à combustion interne et procédé de montage d'un moteur à combustion interne |
DE102018115167A1 (de) | 2018-06-25 | 2020-01-02 | Schaeffler Technologies AG & Co. KG | Nockenwellenverstellvorrichtung mit einem kompakten Aufbau für einen trockenen Riementrieb einer Brennkraftmaschine und Montageverfahren der Nockenwellenverstellvorrichtung |
Families Citing this family (6)
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CN106837458A (zh) * | 2017-03-27 | 2017-06-13 | 江苏海龙电器有限公司 | 凸轮轴调节装置 |
DE112017008278T5 (de) * | 2017-12-18 | 2020-08-27 | Schaeffler Technologies AG & Co. KG | Nockenwellenverstellvorrichtung |
DE102018108534B4 (de) | 2018-04-11 | 2022-04-14 | Schaeffler Technologies AG & Co. KG | Nockenwellenverstellvorrichtung eines Steuertriebs mit einem trockenen Riemen |
JP7225836B2 (ja) * | 2019-01-24 | 2023-02-21 | トヨタ自動車株式会社 | 内燃機関 |
CN110318837A (zh) * | 2019-08-12 | 2019-10-11 | 绵阳富临精工机械股份有限公司 | 一种控制阀及凸轮调相器油路*** |
CN112796849B (zh) * | 2019-11-14 | 2024-05-17 | 舍弗勒投资(中国)有限公司 | 用于凸轮轴调相器的转子和凸轮轴调相器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5361735A (en) | 1989-10-16 | 1994-11-08 | Borg-Warner Automotive Transmission & Engine Components Corporation | Belt driven variable camshaft timing system |
WO1999023362A1 (fr) * | 1997-11-03 | 1999-05-14 | Mechadyne International Plc | Mecanisme de changement de phase |
DE19908146A1 (de) * | 1999-02-25 | 2000-08-31 | Schaeffler Waelzlager Ohg | Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
DE102008051145A1 (de) * | 2008-10-09 | 2010-04-15 | Schaeffler Kg | Nockenwellenversteller mit Riementrieb |
-
2014
- 2014-04-01 US US14/242,107 patent/US20150275707A1/en not_active Abandoned
-
2015
- 2015-03-26 EP EP15161161.3A patent/EP2927440A1/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5361735A (en) | 1989-10-16 | 1994-11-08 | Borg-Warner Automotive Transmission & Engine Components Corporation | Belt driven variable camshaft timing system |
WO1999023362A1 (fr) * | 1997-11-03 | 1999-05-14 | Mechadyne International Plc | Mecanisme de changement de phase |
DE19908146A1 (de) * | 1999-02-25 | 2000-08-31 | Schaeffler Waelzlager Ohg | Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
DE102008051145A1 (de) * | 2008-10-09 | 2010-04-15 | Schaeffler Kg | Nockenwellenversteller mit Riementrieb |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017162233A1 (fr) * | 2016-03-23 | 2017-09-28 | Schaeffler Technologies AG & Co. KG | Système de déphasage d'arbre à cames comprenant des moyens de collecte de fluide hydraulique s'écoulant d'une soupape pour le retour direct dans le déphaseur d'arbre à cames |
US11041411B2 (en) | 2016-03-23 | 2021-06-22 | Schaeffler Technologies AG & Co. KG | Camshaft adjusting system with means for catching hydraulic fluid draining from a valve in order to directly recirculate the fluid into the camshaft adjuster |
FR3061930A1 (fr) * | 2017-01-17 | 2018-07-20 | Peugeot Citroen Automobiles Sa | Arbre a cames de moteur thermique |
WO2018206281A1 (fr) * | 2017-05-11 | 2018-11-15 | Volkswagen Aktiengesellschaft | Moteur à combustion interne et procédé de montage d'un moteur à combustion interne |
DE102017116732A1 (de) | 2017-07-25 | 2018-08-16 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller zur variablen Einstellung der Ventilsteuerzeiten einer Brennkraftmaschine und Anordnung zur Abdichtung eines Nockenwellenverstellers |
DE102018115167A1 (de) | 2018-06-25 | 2020-01-02 | Schaeffler Technologies AG & Co. KG | Nockenwellenverstellvorrichtung mit einem kompakten Aufbau für einen trockenen Riementrieb einer Brennkraftmaschine und Montageverfahren der Nockenwellenverstellvorrichtung |
WO2020001683A1 (fr) | 2018-06-25 | 2020-01-02 | Schaeffler Technologies AG & Co. KG | Dispositif de réglage d'arbre à cames à structure compacte pour une transmission à courroie sèche d'un moteur à combustion interne et procédé de montage du dispositif de réglage d'arbre à cames |
DE102018115167B4 (de) | 2018-06-25 | 2024-07-25 | Schaeffler Technologies AG & Co. KG | Nockenwellenverstellvorrichtung mit einem kompakten Aufbau für einen trockenen Riementrieb einer Brennkraftmaschine und Montageverfahren der Nockenwellenverstellvorrichtung |
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US20150275707A1 (en) | 2015-10-01 |
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