EP1757779B1 - Phaser for controlling the timing between a camshaft and a timing gear - Google Patents

Phaser for controlling the timing between a camshaft and a timing gear Download PDF

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Publication number
EP1757779B1
EP1757779B1 EP20060254273 EP06254273A EP1757779B1 EP 1757779 B1 EP1757779 B1 EP 1757779B1 EP 20060254273 EP20060254273 EP 20060254273 EP 06254273 A EP06254273 A EP 06254273A EP 1757779 B1 EP1757779 B1 EP 1757779B1
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EP
European Patent Office
Prior art keywords
rotor
phaser
stator
apertures
ring
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.)
Active
Application number
EP20060254273
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German (de)
French (fr)
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EP1757779A2 (en
EP1757779A3 (en
Inventor
Axel H. Berndorfer
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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.)
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Publication date
Priority to EP05018206 priority Critical
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP20060254273 priority patent/EP1757779B1/en
Publication of EP1757779A2 publication Critical patent/EP1757779A2/en
Publication of EP1757779A3 publication Critical patent/EP1757779A3/en
Application granted granted Critical
Publication of EP1757779B1 publication Critical patent/EP1757779B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34Valve-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
    • F01L1/344Valve-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
    • F01L1/3442Valve-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34Valve-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
    • F01L1/344Valve-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
    • F01L1/34409Valve-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 by torque-responsive means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34Valve-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
    • F01L1/344Valve-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
    • F01L1/3442Valve-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
    • F01L2001/34423Details relating to the hydraulic feeding circuit
    • F01L2001/34426Oil control valves

Description

  • The present invention relates to a phaser for controlling the timing between a camshaft and a timing gear.
  • An internal combustion engine has a crank-shaft driven by the connecting rods and pistons and one or more camshafts, which actuate the intake and exhaust valves of the cylinders. The camshaft is connected to a timing gear by means of a timing drive, such as a belt, chain or gears. In a variable cam timing system, the timing gear is replaced by a variable angle coupling, known as a phaser. The phaser is provided with a rotor connected to the camshaft in a housing or stator connected to the timing gear. This allows the camshaft to rotate independently of the timing gear, within angular limits, to change the relative timing of the camshaft and the crank-shaft. The term "phaser", as used in the present text, includes the stator and the rotor and all of the parts to control the relative angle of position of the stator and the rotor to allow the timing of the camshaft to be offset from the crank-shaft. In any of the multiple-camshaft engines, it will be understood that there would be one or more phasers per engine.
  • A phaser as described in the introduction is known in the prior art. Most variable camshaft phasers in production today are hydraulically activated devices, using vanes received in recesses, the vanes and the recesses enclosing fluid pockets, wherein the fluid pressure in the fluid pockets will control the angular position of the vane in the recess. The phasers, known in the prior art, are activated by oil pressure derived from an engine oil pump. In order to optimise the phaser performance, theoretically the capacity of such an engine oil pump should be as high as possible. However, the bigger the engine oil pump will be, the bigger the parasitic power losses the oil pump will cause. Therefore, a compromise must be found in order not to overlay fuel economy gains of the phaser with losses created by a larger engine oil pump.
  • Examples of known cam phaser arrangements are disclosed in US5107804 , EP1400661 , US5056477 , EP1477529 , US2004/0040525 , US5507254 and FR1085087 .
  • It is an object of the present invention to increase the phaser performance with a given oil pump capacity. That means that the control of the phaser will be optimised, without the need of using a bigger engine oil pump.
  • According to the present invention this object is achieved in that a phaser for controlling the timing between a camshaft and a timing gear, the phaser comprising:
    • a rotor having at least one vane, the rotor being connectable to one of the camshaft and the timing gear for rotation therewith;
    • a stator, co-axially surrounding the rotor, provided with at least one recess for receiving the at least one vane of the rotor and allowing rotational movement of the rotor with respect to the stator, the stator being connectable to the other of the camshaft and the timing gear,
    • wherein the at least one vane divides the recess into a first pocket and a second pocket, the pockets being able to receive fluids under pressure, wherein the introduction of a fluid into the first pocket causes the rotor to move in a first rotational direction relative to the stator, and in that the introduction of a fluid in the second pocket causes the rotor to move in the opposite rotational direction relative to the stator;
    • wherein the phaser comprises control means for controlling the fluid pressure on opposite sides of the vanes to thereby control the angular position of the rotor with respect to the stator, the control means comprising first rotor-apertures and second rotor-apertures, positioned on opposite sides of the vanes, and a control ring, co-axial with the rotor, drive means being provided for adjusting the angular position of the control ring with respect to the rotational axis thereof to adjust the timing of the opening and closing of communication between the first and second rotor apertures;
    wherein the control ring comprises first ring-apertures, able to align with the first rotor-apertures in order to bring the first pocket in communication with a reservoir for receiving fluid, and second ring-apertures, able to align at the same time with the second rotor-apertures in order to bring the second pocket in communication with said reservoir, in order to thereby allow communication between the first and second pockets via the reservoir, whereby the angular position of the control ring can be adjusted by the drive means to alter the opening and closing of communication between the pockets of the stator recess with respect to the angular position of the camshaft.
  • Preferably the control means is capable of timing the opening of the connection between the first and second pockets with the occurrence of peak pressures in one of the first or second pockets, caused by the inherent torque reversals of the camshaft.
  • A phaser, according to the present invention is able to utilise oil pressure created internally in the phaser during the use thereof to improve phase rate performance.
  • The inherent torque reversals of the camshaft will create pressure pulsations in the pockets on either side of the rotor vanes, which are significantly higher than the engine oil pressure. Since the phaser according to the present invention can modulate the timing of opening and closing of communication between the pockets on either side of the rotor vanes short-cut means, these higher pressure peaks can be used to support the oil flow from the pockets on the first side of the vanes to the other side of the vanes. This additional shift of fluid from the first pockets towards the second or vice versa will increase the performance of the phaser without the need of using a pump with a larger capacity.
  • In one embodiment, the control ring does not rotate with the rotor and the stator along the rotational axis of the assembly. The angular position of the ring can be adjusted by the drive means to alter the opening and closing of communication between the pockets of the stator recess with respect to the angular position of the camshaft.
  • According to the present invention it is possible that the drive means are adapted to rotate the ring with respect to its rotational axis. Alternatively, it is possible that the drive means comprise a cam-cam follower system for converting a translational movement of the drive means into a rotational movement of the ring.
  • According to the invention, it is possible that the drive means comprise a stepper motor. It should be understood that alternative drive means for changing the angular position of the control ring.
  • The present invention will now be described with reference to the accompanying drawings wherein:
    • Figure 1 shows the stator, rotor and ring of a cam phaser according to an embodiment of the present invention;
    • Figure 2 shows, in cross section, part of the cam phaser of Fig. 1;
    • Figure 3 shows a top view of the control ring of the cam phaser of Fig. 1;
    • Figure 4 is a top view of the rotor of the cam phaser of Fig. 1; and
    • Figure 5 is a tope view of a modified control ring.
  • Figure 1 shows the assembly of a stator 1, a rotor 2 and a ring 3. According to Figure 1, the stator 1 is provided with four recesses 4. The rotor is provided with four vanes 5. Each of the vanes 5, divide each of the recesses 4 into a first pocket 4a and second pocket 4b.
  • The pockets 4a and 4b are capable for receiving fluid, such as oil under pressure. An increase of pressure in pocket 4a will move the vane 5 in a direction clockwise with respect to the stator 1. An increase in the oil pressure in pockets 4 will move the vane 5 in the opposite direction. That means by controlling the fluid pressure in both pockets 4a, 4b the angular position of the rotor with respect to the stator 1 can be manipulated.
  • The fluid pressure in the pockets 4a and 4b will be regulated, using the engine oil pressure. In case the pressure in pocket 4a is to be increased, the passage to pocket 4a will be opened to allow fluid to flow out of pocket 4b. In case the engine oil pressure would be the only mechanism to control the relative movement of the stator 1 and the rotor 2, the movement of the two parts would be dependent on the instantaneous oil pressure. When the latter is low, the rotor moves very slowly, or not at all, with respect to the stator.
  • During the use of the phaser, pressure pulsations in pockets 4a and 4b on either side of the vanes 5 will reach values which are significantly higher than the engine oil pressure. These pressure pulsations are caused by the inherent torque reversals of the camshaft 11 (shown in Figure 2). In order to use these pressure pulsations in pockets 4a and 4b an additional control ring 3 is present in the phaser according to the invention. The control ring 3 is co-axial with both the rotor 2 and the stator 1. The rotor is capable of rotating with respect to control ring 3 and is mounted to be stationary with respect to the cylinder head, albeit angularly adjustable with respect thereto as will be described below. The control ring 3 comprises four first ring-apertures 6 and four second ring-apertures 7. The rotor 2 is provided with four first rotor-apertures 8 and four second rotor-apertures 9. In case the first ring-apertures 6 of the control ring 3 are in line with the first rotor-apertures 8 in the rotor 2, a connection is created between the first pocket 4a and a central reservoir 10 for receiving fluid.
  • As shown in Figure 1, at the same time, the second ring-apertures 7 of the control ring 3 are in line with the second rotor-apertures 9 of the rotor 2, creating a connection between the pockets 4b and the central reservoir 10 for receiving fluid.
  • The control ring 3 does not rotate with the rotor 2, but is rather stationery with respect to the cylinder head. However, its angular position with respect to the camshaft can be adjusted by a drive means, such as a stepper motor. The drive means will be controlled, for example, by the engine control unit to position the ring-apertures 6 and 7 relative to the rotor-apertures 8 and 9 in order to ensure that the connection between both the pockets 4a and 4b and the central reservoir for fluid is established at a cam angle that represents a pressure difference between the first pockets 4a and the second pockets 4b.
  • For example, when the phaser is to be commanded to advance, meaning that the stator 1 will turn clockwise relative to the rotor 2, the control ring 3 is adjusted so that the pockets 4a and 4b are connected at a time when the pressure in the second pocket 4b is higher than the pressure in the pocket 4a, causing the fluid to flow into the first pocket 4a, and thereby enabling the phasing activity.
  • In Figure 2 a side cross sectional view of part of the phaser according to one embodiment of the invention is shown. Figure 2 shows the stator 1 which is connected to a timing gear 20. The rotor 2 is connected to a camshaft 11, the phaser allowing rotational movement of the camshaft with respect to the timing gear 20. In order to use pressure differences between pockets 4a and 4b as described with reference to Figure 1, the angular position of the control ring 3 should be determined. Therefore, drive means 12 are present to control the angular position of the control ring 3 with respect to rotational axis thereof. The ring 3 is provided with first ring-apertures 6 and second ring-aperture 7. Those apertures are to be brought in line, at the appropriate time, with the rotor-apertures 8 and 9 in the rotor 2.
  • Figure 3 provides a side view of the control ring according to the present invention. In the ring 3, first ring-apertures 6 are present and second ring-apertures 7.
  • Figure 4 provides a top view of the rotor 2 provided with rotor-apertures 8, 9. In order to control the connection of the pockets 4a and 4b as described with respect to Figure 1, a possible embodiment of the second ring-aperture 7 is shown in Figure 5.
  • Alternatively, it is possible to have a first ring-aperture 6 with a similar configuration. This feature will have the effect that at one of the sets of ring-apertures 6 or 7 is permanently connected to the central cavity 10, comprise a groove 7a in the surface of the ring 3, connected to a through-hole 7b which is connectable to the central recess 10 for receiving fluid (see Figure 5).

Claims (5)

  1. A phaser for controlling the timing between a camshaft and a timing gear, the phaser comprising:
    - a rotor (2) having at least one vane (5), the rotor being connectable to one of the camshaft and the timing gear for rotation therewith;
    - a stator (1), co-axially surrounding the rotor, provided with at least one recess (4) for receiving the at least one vane of the rotor and allowing rotational movement of the rotor (2) with respect to the stator (1), the stator (1) being connectable to the other of the camshaft and the timing gear,
    - wherein the at least one vane (5) divides the recess (4) into a first pocket (4a) and a second pocket (4b), the pockets being able to receive fluids under pressure, wherein the introduction of a fluid into the first pocket causes the rotor to move in a first rotational direction relative to the stator, and in that the introduction of a fluid in the second pocket causes the rotor (2) to move in the opposite rotational direction relative to the stator (1);
    - wherein the phaser comprises control means for controlling the fluid pressure on opposite sides of the vanes to thereby control the angular position of the rotor with respect to the stator, the control means comprising first rotor-apertures (8) and second rotor-apertures (9), positioned on opposite sides of the vanes, and a control ring (3), co-axial with the rotor, drive means being provided for adjusting the angular position of the control ring with respect to the rotational axis thereof to adjust the timing of the opening and closing of communication between the first and second rotor apertures;
    characterised in that the control ring comprises first ring-apertures (6), able to align with the first rotor-apertures (8) in order to bring the first pocket in communication with a reservoir for receiving fluid, and second ring-apertures (7), able to align at the same time with the second rotor-apertures (9) in order to bring the second pocket in communication with said reservoir, in order to thereby allow communication between the first and second pockets via the reservoir, whereby the angular position of the control ring can be adjusted by the drive means to alter the opening and closing of communication between the pockets of the stator recess with respect to the angular position of the camshaft.
  2. A phaser as claimed in claim 1, wherein the control means is capable of timing the opening of the connection between the first and second pockets with the occurrence of peak pressures in one of the first or second pockets, caused by the inherent torque reversals of the camshaft.
  3. A phaser as claimed in any preceding claim, wherein the control ring (3) does not rotate with the rotor (2) and the stator (4) along the rotational axis of the assembly.
  4. A phaser as claimed in according to claim 1, wherein the drive means comprises a cam-cam follower system for converting a translational movement of the drive means into a rotational movement of the ring.
  5. A phaser as claimed in claim 1, wherein the drive means comprises a stepper motor.
EP20060254273 2005-08-22 2006-08-15 Phaser for controlling the timing between a camshaft and a timing gear Active EP1757779B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05018206 2005-08-22
EP20060254273 EP1757779B1 (en) 2005-08-22 2006-08-15 Phaser for controlling the timing between a camshaft and a timing gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060254273 EP1757779B1 (en) 2005-08-22 2006-08-15 Phaser for controlling the timing between a camshaft and a timing gear

Publications (3)

Publication Number Publication Date
EP1757779A2 EP1757779A2 (en) 2007-02-28
EP1757779A3 EP1757779A3 (en) 2007-03-07
EP1757779B1 true EP1757779B1 (en) 2008-11-12

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EP20060254273 Active EP1757779B1 (en) 2005-08-22 2006-08-15 Phaser for controlling the timing between a camshaft and a timing gear

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2075421A1 (en) * 2007-12-28 2009-07-01 Delphi Technologies, Inc. Fluid control valve for a cam phaser
US10400909B2 (en) 2016-04-11 2019-09-03 Borgwarner Inc. Three position fast acting solenoid

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1085087A (en) * 1953-06-17 1955-01-27 Device for controlling the relative angular displacement of two co-axial portions of a transmission
FR2641832B1 (en) * 1989-01-13 1991-04-12 Melchior Jean Coupling for transmitting alternate pairs
US5507254A (en) * 1989-01-13 1996-04-16 Melchior; Jean F. Variable phase coupling for the transmission of alternating torques
DE3930157A1 (en) * 1989-09-09 1991-03-21 Bosch Gmbh Robert Means for adjustment of the angle of rotation assignment of a camshaft to its drive element
US5107804A (en) * 1989-10-16 1992-04-28 Borg-Warner Automotive Transmission & Engine Components Corporation Variable camshaft timing for internal combustion engine
US6840202B2 (en) * 2002-09-03 2005-01-11 Borgwarner Inc. Method to reduce noise of a cam phaser by controlling the position of center mounted spool valve
US6814038B2 (en) * 2002-09-19 2004-11-09 Borgwarner, Inc. Spool valve controlled VCT locking pin release mechanism
US7137371B2 (en) * 2003-02-07 2006-11-21 Borgwarner Inc. Phaser with a single recirculation check valve and inlet valve
US6799544B1 (en) * 2003-05-29 2004-10-05 Delphi Technologies, Inc. Method and apparatus for actuating a cam phaser

Also Published As

Publication number Publication date
EP1757779A2 (en) 2007-02-28
EP1757779A3 (en) 2007-03-07

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