EP1832719A1 - Phase varying device of engine - Google Patents
Phase varying device of engine Download PDFInfo
- Publication number
- EP1832719A1 EP1832719A1 EP05768419A EP05768419A EP1832719A1 EP 1832719 A1 EP1832719 A1 EP 1832719A1 EP 05768419 A EP05768419 A EP 05768419A EP 05768419 A EP05768419 A EP 05768419A EP 1832719 A1 EP1832719 A1 EP 1832719A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary drum
- casing section
- varying device
- engine
- electromagnetic clutch
- 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- Withdrawn
Links
- 230000005291 magnetic effect Effects 0.000 claims description 25
- 239000002783 friction material Substances 0.000 description 15
- 239000010705 motor oil Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
Images
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
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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
- F01L1/34403—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft
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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
- F01L1/022—Chain drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34483—Phaser return springs
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- 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
- F01L1/352—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 bevel or epicyclic gear
- F01L2001/3522—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 bevel or epicyclic gear with electromagnetic brake
-
- 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
- F01L2301/00—Using particular materials
-
- 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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/03—Auxiliary actuators
- F01L2820/032—Electric motors
Definitions
- the present invention relates to a phase varying device of an engine of an automobile that transmits rotation of a crankshaft of the automobile engine to a camshaft for opening/closing an intake valve or an exhaust valve of the engine and varies open/close timing of the intake valve or the exhaust valve according to an operating condition such as an engine load and revolutions.
- the phase varying device is used in a manner fitted to an unillustrated engine case (a cover for the phase varying device) since the intake valve or the exhaust valve is opened/closed, and includes an annular outer casing section 10 having a sprocket 12 to which a driving force of a crankshaft of an engine is transmitted by an unillustrated chain, an annular inner casing section 20 arranged coaxially with the outer casing section 10, capable of rotating relatively to the outer casing section 10, and forming a part of a camshaft 2, an intermediate member 30 interposed between the outer casing section 10 and the inner casing section 20 while being respectively engaged with the outer casing section 10 and the inner casing section 20 through helical splines and moving in an axial direction thus varying the phase of the inner casing section 20 with respect to the outer casing section 10, and an electromagnetic brake 40 being an electromagnetic control means provided at a side of the inner casing section 20 opposite the side where the camshaft 2 is disposed and moving the intermediate member 30 in the axial direction.
- the outer casing section 10 is composed of the sprocket 12 provided with a ring-shaped concave portion 13 at an inner periphery thereof, an inner flange plate 14 closely adhered to a side surface of the sprocket 12 and designing a flange engagement groove 13A in cooperation with the concave portion 13, and a spline case 16 fixing the inner flange plate 14 to the sprocket 12 by tightening together and formed with a spline engagement portion 17 with the intermediate member 30 at an inner circumference thereof.
- a step portion 13c facing directly to an outer periphery of a flange 24 at the side of the inner casing section 20 is provided between both concave portions 13a and 13b.
- the sprocket 12, inner flange plate 14, and spline case 16 are integrated by a tightening screw 11, which therefore facilitates formation of the flange engagement groove 13A and the spline engagement portion 17 in the spline case 16.
- a small-diameter sprocket 12A is fixedly fitted to the outer casing section 10, and although not illustrated, the small-diameter sprocket 12A is coupled with a sprocket of the phase varying device for opening/closing the other of the intake valve or exhaust valve by a chain, for controlling both the intake valve and exhaust valve.
- female and male helical splines 32 and 33 are provided on inner and outer circumferential surfaces of the intermediate member 30, male helical splines 23 are provided on an outer peripheral surface of the inner casing section 20, and female helical splines are formed at the spline engagement portion 17 of an inner circumferential surface of the spline case 16.
- the inner and outer splines 32 and 33 of the intermediate member 30 are provided as helical splines in opposite directions so that a slight movement of the intermediate member 30 in the axial direction can greatly vary the phase of the inner casing section 20 with respect to the outer casing section 10.
- a male screw portion 31 is formed on the outer circumferential surface of the intermediate member 30.
- the electromagnetic brake 40 is composed of an electromagnetic clutch 42 for which an electromagnet (electromagnetic coil) 62 is provided in a clutch case 60 and a friction material 66 is fixedly fitted to the clutch case surface, a rotary drum 44 made of a ferromagnetic material for receiving a braking force from the friction material 66 of the electromagnetic clutch 42, and a torsion coil spring 46 axially interposed between the rotary drum 44 and the outer casing section 10.
- Pins 68 are engaged with holes provided in the engine case, so that the electromagnetic clutch 42 is supported on the engine case so as to be movable in the axial direction but not be rotatable.
- the rotary drum 44 is supported so as to be rotatable on the inner casing section 20 by a bearing 22 and is formed with a female screw portion 45 to be screwed with the male screw portion 31 of the intermediate portion 30.
- the intermediate member 30 moves in the axial direction as a result of the work of both screw sections 45 and 31.
- the rotary drum 44 and outer casing section 10 are fixed at their initial positions by the torsion coil spring 46, the outer casing section 10, inner casing section 20, intermediate member 30, and rotary drum 44 integrally rotate, and no phase difference occurs between the outer casing section 10 and the inner casing section 20. Then, since the inner casing section 20 has been coupled to the camshaft 2 and the outer casing section 10 has been coupled with a crank pulley provided on the crankshaft by a chain, the intake valve or exhaust valve can be opened/closed at a normal timing according to rotation of the crankshaft.
- the intermediate member 30 rotates to its initial position as a result of the action of the torsion coil spring 46 and moves leftward in FIG. 7 to the initial position as a result of the work of the screw portions 31 and 45. Then, the inner casing section 20 rotates to an initial position in a reverse direction with respect to the outer casing section 10 to eliminate the phase difference between both, and the intake valve or exhaust valve is opened/closed at a normal timing.
- friction torque adding members 51 and 55 are interposed between the flange 24 of the inner casing section 20 and sides of the flange engagement groove 13A of the outer casing section 10 so as to increase friction torque of a relative sliding portion between the outer casing section 10 and the inner casing section 20 and suppress gear rattle of the tooth portions hitting against each other from occurring at the helical spline engagement portions 23, 32, 33, and 17 between the intermediate member 30 and the outer casing section 10 and inner casing section 20.
- the phase varying device is internally supplied with engine oil through an inlet 73a of the camshaft 2, an oil channel in the camshaft 2, and an outlet 73b.
- the engine oil that has exited the outlet 73b is supplied to a sliding surface between the friction material 66 provided on the surface of the electromagnetic clutch 42 and the rotary drum 44 so as to prevent overheating between the friction material 66 and the rotary drum 44 owing to friction (see the following Patent Document 1 for details).
- Patent Document 1 Japanese Published Unexamined Patent Application No. 2002-371814 .
- phase varying device when the sliding surface temperature reaches a high temperature owing to frictional heat on the relative sliding surface between the friction material 66 and the rotary drum 44, there is a possibility that the surface of the friction material generally formed of a porous material clogs up with reactants and insoluble contents of additives such as an antioxidant, a friction adjuster, and a detergent/dispersant dispersed in the engine oil and friction torque generated at the friction material 66 and rotary drum 44 is lowered, so that a cooling mechanism to allow the engine oil to flow between the friction material 66 and the rotary drum 44 is indispensable. Since the cooling mechanism is formed, the phase varying device has a complicated structure, thus resulting in a high cost, wherein a problem resides.
- the present invention has been made in view of the problems described above and an object thereof is to prevent heat generation owing to friction in a phase varying device of an automobile engine.
- a phase varying device of an engine including: an outer casing section having a sprocket to which rotation of a crankshaft of the engine is transmitted; an inner casing section capable of rotating relatively to the outer casing section and coupled with a camshaft for opening/closing an intake valve or an exhaust valve of the engine; and an intermediate member meshing with the outer casing section and the inner casing section through helical splines, relative rotation being generated between the outer casing section and the inner casing section by moving the intermediate member in an axial direction thus varying an open/close timing of the intake valve or the exhaust valve
- the phase varying device of an engine is provided with an electromagnetic control means having a rotary drum being screwed on the intermediate member and provided as a permanent magnet and an electromagnetic clutch for braking the rotary drum.
- a plurality of magnetic poles are formed on the rotary drums, and by arranging electromagnets in the electromagnetic clutch so that magnetic poles corresponding to the magnetic poles are also formed and changing polarity of the electromagnets with an appropriate phase relative to the magnetic poles of the rotary drum, the rotary drum is braked or accelerated.
- the electromagnetic clutch is disposed in proximity to an interior side surface of the rotary drum.
- a vicinity of an outer circumference of the rotary drum is magnetized, and the electromagnetic clutch is arranged in proximity to the vicinity of the outer circumference of the rotary drum.
- phase varying device since the rotary drum is braked by an electromagnetic force between the electromagnets of the electromagnetic clutch and the rotary drum being a permanent magnet, no friction material is necessary. In addition, since the phase varying device never reaches a high temperature owing to frictional heat resulting from contact between the friction material of the electromagnetic clutch and the rotary drum, an effect to reduce deterioration of an engine oil is provided. In addition, no cooling mechanism for the electromagnetic clutch and rotary drum is necessary, so that not only is the structure simplified, but also malfunction hardly occurs and life is prolonged. Furthermore, for the phase varying device, the engine oil for cooling can be reduced, and no friction material is necessary, which is economical.
- a plurality of magnetic poles are formed on the rotary drums, and by arranging electromagnets in the electromagnetic clutch so that magnetic poles corresponding to the magnetic poles are also formed and changing polarity of the electromagnets with an appropriate phase relative to the magnetic poles of the rotary drum, a suction force or a repulsive force can be freely continuously generated between the electromagnetic clutch and the rotary drum, so that the rotary drum is freely braked or accelerated. Therefore, in the phase varying device, since the electromagnetic clutch 42 allows both braking and acceleration of the rotary drum 44, a torsion coil spring to return the rotary drum 44 to its initial position is no longer necessary, and the number of components can be reduced.
- the entire length of the phase varying device can be made shorter than that of the conventional device where the electromagnetic clutch is disposed in proximity to an exterior side surface of the rotary drum.
- the moving range of the intermediate member in the axial direction can be increased, so that the phase can be varied in a wider range than that of the conventional art.
- the fourth aspect of the invention furthermore, since only a vicinity of an outer circumference of the rotary drum is magnetized and the electromagnetic clutch is arranged in proximity to the vicinity of the outer circumference of the rotary drum, the entire length of the phase varying device can be further shortened.
- the electromagnetic clutch is not provided lateral to the rotary drum, the rotary drum can also be reduced in diameter to reduce the moment of inertia so as to improve the phase varying device in responsiveness. Furthermore, even when the rotary drum moves in an axial direction, the rotary drum and electromagnetic clutch are always kept at an equal distance, so that highly accurate and stable phase control becomes possible.
- FIG. 1(A) is a longitudinal sectional view of the phase varying device
- FIG. 1(B) is a front view of a rotary drum 44 of the phase varying device
- FIG. 1(C) is a front view of an electromagnetic clutch 42 of the phase varying device.
- FIG. 2 is a diagram showing a current supplying circuit to electromagnets 62 of the electromagnetic clutch 42.
- the phase varying device of the present embodiment is the same as the abovementioned conventional phase varying device except for an electromagnetic control means 40a formed of the rotary drum 44 and electromagnetic clutch 42 to be described later and the current supplying circuit to the electromagnets 62 to be also described later.
- an electromagnetic control means 40a formed of the rotary drum 44 and electromagnetic clutch 42 to be described later
- the current supplying circuit to the electromagnets 62 to be also described later.
- description will be given of the electromagnetic control means 40a and current supplying circuit to the electromagnets 62 while description of parts the same as those in the conventional device will be omitted.
- the rotary drum 44 is provided as a permanent magnet strongly magnetized toward an axial direction so that six magnetic poles N and S of an alternate N-pole and S-pole appear along a circumferential direction, and as shown in FIG. 1(C), the electromagnetic clutch 42 is arranged in proximity to an exterior side surface of the rotary drum 44, and the three electromagnets (electromagnetic coils) 62 connected in series are arranged in a clutch case at positions corresponding to the magnetic poles N and S of the rotary drum 44 along a circumferential direction.
- the electromagnetic control means 40a is not provided with a torsion coil spring to urge the rotary drum 44 to its initial position, and furthermore, the electromagnetic clutch 42 is not movable in axial and radial directions with respect to the engine case 58 or not provided with a friction material that slidingly contacts the rotary drum 44.
- the current supplying circuit to the electromagnets 62 is formed of, as shown in FIG. 2, four current controllers (transistors) 64a to 64d that control a current supplied from a power source Vcc to the electromagnets 62 and a controller 65 that sends control signals to the respective current controllers 64a to 64d.
- polarity of the electromagnets can be alternately changed.
- controller 65 signals from unillustrated rotation detection sensors respectively provided on an unillustrated crank pulley and camshaft 2 have been received, and the controller 65 detects a phase of the camshaft 2 with respect to the crank pulley. And, the controller 65 calculates a command phase difference according to engine revolutions, an accelerator position, and the like so as to control the phase of the camshaft 2 with respect to the crank pulley. Namely, the controller 65 sends control signals to the respective current controllers 64a to 64d to brake or accelerate the rotary drum 44 until the phase difference between the crank pulley and camshaft 2 equals the command phase difference and controls the phase difference between the crank pulley and camshaft 2 so as to coincide with the command phase difference .
- the rotation detection sensor used here to detect a phase of the camshaft 2 with respect to the crank pulley can also be used as a phase detection sensor of the electromagnets 62 to the magnetic poles N and S of the rotary drum 44 described above.
- phase varying device of the present embodiment since the rotary drum 44 is braked or accelerated by a suction force or a repulsive force between the electromagnets 62 of the electromagnetic clutch 42 and the rotary drum 44, no friction is generated between both, and therefore no friction material is necessary for the electromagnetic clutch 42.
- the electromagnetic control means 40a since the electromagnetic control means 40a never reaches a high temperature owing to frictional heat, no cooling mechanism is necessary, so that the structure is also simplified, and malfunction hardly occurs and life is prolonged. Moreover, engine oil for cooling can be reduced, and no friction material is necessary, which is economical.
- the electromagnetic clutch 42 allows both braking and acceleration of the rotary drum 44, a torsion coil spring to return the rotary drum 44 to its initial position is no longer necessary, and the number of components can be reduced.
- FIG. 3 a second embodiment according to a phase varying device of the present invention is shown.
- FIG. 3 (A) is a longitudinal sectional view of the phase varying device
- FIG. 3(B) is a front view of a rotary drum 44 of the phase varying device
- FIG. 3(C) is a front view of an electromagnetic clutch 42 of the phase varying device.
- the phase varying device is, as shown in FIG. 3(A), different from the aforementioned first embodiment in the arrangement of the electromagnetic clutch 42 and rotary drum 44 and the attaching method to an engine case 58.
- the electromagnetic clutch 42 is arranged in proximity to an interior side surface of the rotary drum 44 and is supported on a shaft portion 44a of the rotary drum 44 via a bearing 43 or the like.
- a pin 42a provided on the electromagnetic clutch 42 is engaged with a rotation preventing groove 58a of the engine case 58 to restrict the electromagnetic clutch 42 from rotating.
- the electromagnetic clutch 42 can move in an axial direction while keeping a distance from the rotary drum 44 fixed.
- Other aspects are the same as those of the aforementioned first embodiment.
- the entire length can be made shorter than that of the aforementioned first embodiment.
- the electromagnetic clutch 42 keeps the distance from the rotary drum 44 fixed, a braking force or an accelerating force applied to the rotary drum 44 is kept fixed, so that highly accurate and stable phase control becomes possible.
- FIG. 4 a third embodiment according to a phase varying device of the present invention is shown.
- FIG. 4 (A) is a longitudinal sectional view of the phase varying device
- FIG. 4(B) is a front view of a rotary drum 44 of the phase varying device
- FIG. 4(C) is a front view of an electromagnetic clutch 42 of the phase varying device.
- the phase varying device is, as shown in FIG. 4(A), different from the aforementioned first embodiment in the point that the electromagnetic clutch 42 is arranged in proximity to an outer circumference of the rotary drum 44 and, as shown in FIG. 4(B), only a vicinity of the outer circumference of the rotary drum 44 is magnetized, and is the same as the aforementioned first embodiment in other aspects.
- the magnitude of a magnetic force is greatly affected by the distance between the magnetic poles, even when only the vicinity of the outer circumference of the rotary drum 44 is magnetized, a sufficient magnetic force can be obtained as the magnetic poles N and S and the electromagnets 62 are close in distance.
- the phase varying device of the present embodiment since the electromagnetic clutch 42 is arranged at the outer circumferential side of the rotary drum 44, the entire length can be made shorter than that of the aforementioned first embodiment. In addition, since the electromagnetic clutch 42 is not arranged lateral to the rotary drum 44, the rotary drum 44 can be reduced in diameter to reduce the moment of inertia so as to improve the phase varying device in responsiveness. Furthermore, even when the rotary drum 44 moves in an axial direction, the rotary drum 44 and electromagnetic clutch 42 are always kept at an equal distance, so that highly accurate and stable phase control becomes possible.
- FIG. 5 (A) is a front view of the rotary drum 44 of the phase varying device
- FIG. 5(B) is a sectional view along a line V-V of FIG. 5(A)
- FIG. 6 (A) is a front view of the electromagnetic clutch 42 of the phase varying device
- FIG. 6(B) is a side view of the electromagnetic clutch 42.
- the identical poles N (or S) may be arranged at equal intervals along the circumferential direction of the rotary drum 44 as shown in FIG. 5, it is not necessary for electromagnets 62 included in the electromagnetic clutch 42 to orient their axial directions along the circumferential direction of the electromagnetic clutch 42 as in the aforementioned respective embodiments, and these may be oriented in a direction orthogonal to the electromagnetic clutch 42 as shown in FIG. 6.
- the poles N and S formed on the rotary drum 44 may be of any number equal to or more than two.
- the poles may be of any number equal to or more than two.
- the electromagnetic clutch 42 can move in the axial direction while keeping the distance from the rotary drum 44 fixed, however, in order to simplify the structure, the electromagnetic clutch 42 may be fixedly fitted to the engine case 58 so as not to be movable in the axial direction.
- the electromagnetic control means 40a can carry out either braking or acceleration of the rotary drum 44, however, the electromagnetic control means 40a may carry out only braking.
- a torsion coil spring to urge the rotary drum 44 to its initial position is indispensable. Since such a torsion coil spring makes the engine drivable even when the electromagnetic clutch 42 has malfunctioned, a weak torsion coil spring may be provided in the aforementioned first to third embodiments as well.
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Abstract
[PROBLEMS] To prevent generation of heat by friction in a phase varying device of the engine of an automobile.
[MEANS FOR SOLVING PROBLEMS] The phase varying device of an engine comprises an outer casing section (10) having a sprocket (12) for transmitting rotation of the crankshaft of the engine, an inner casing section (20) capable of rotating relatively to the outer casing section and coupled with a cam shaft (2) for opening/closing the intake valve or the exhaust valve of the engine, and an intermediate member (30) meshing with the outer casing section and the inner casing section through a helical spindle, wherein relative rotation is generated between the outer casing section and the inner casing section by moving the intermediate member in the axial direction thus varying the open/close timing of the intake valve or the exhaust valve. The phase varying device of an engine is further provided with an electromagnetic control means (40a) having a permanent-magnet rotary drum (44) being screwed on the intermediate member, and an electromagnetic clutch (42) for braking or accelerating the rotary drum.
Description
- The present invention relates to a phase varying device of an engine of an automobile that transmits rotation of a crankshaft of the automobile engine to a camshaft for opening/closing an intake valve or an exhaust valve of the engine and varies open/close timing of the intake valve or the exhaust valve according to an operating condition such as an engine load and revolutions.
- As this type of phase varying device, one as disclosed in the following Patent Document 1 proposed by the present inventor et al. has been known. This is shown in FIG. 7.
- The phase varying device is used in a manner fitted to an unillustrated engine case (a cover for the phase varying device) since the intake valve or the exhaust valve is opened/closed, and includes an annular
outer casing section 10 having asprocket 12 to which a driving force of a crankshaft of an engine is transmitted by an unillustrated chain, an annularinner casing section 20 arranged coaxially with theouter casing section 10, capable of rotating relatively to theouter casing section 10, and forming a part of acamshaft 2, anintermediate member 30 interposed between theouter casing section 10 and theinner casing section 20 while being respectively engaged with theouter casing section 10 and theinner casing section 20 through helical splines and moving in an axial direction thus varying the phase of theinner casing section 20 with respect to theouter casing section 10, and anelectromagnetic brake 40 being an electromagnetic control means provided at a side of theinner casing section 20 opposite the side where thecamshaft 2 is disposed and moving theintermediate member 30 in the axial direction. On thecamshaft 2, provided is acam 2a for opening/closing one of the intake valve or exhaust valve. - The
outer casing section 10 is composed of thesprocket 12 provided with a ring-shapedconcave portion 13 at an inner periphery thereof, aninner flange plate 14 closely adhered to a side surface of thesprocket 12 and designing aflange engagement groove 13A in cooperation with theconcave portion 13, and aspline case 16 fixing theinner flange plate 14 to thesprocket 12 by tightening together and formed with aspline engagement portion 17 with theintermediate member 30 at an inner circumference thereof. By a large-diameter concave portion at an opening side of theconcave portion 13 of theouter casing section 10 and a small-diameterconcave portion 13b at an inner side of theconcave portion 13, astep portion 13c facing directly to an outer periphery of aflange 24 at the side of theinner casing section 20 is provided between bothconcave portions sprocket 12,inner flange plate 14, andspline case 16 are integrated by a tighteningscrew 11, which therefore facilitates formation of theflange engagement groove 13A and thespline engagement portion 17 in thespline case 16. - In addition, a small-
diameter sprocket 12A is fixedly fitted to theouter casing section 10, and although not illustrated, the small-diameter sprocket 12A is coupled with a sprocket of the phase varying device for opening/closing the other of the intake valve or exhaust valve by a chain, for controlling both the intake valve and exhaust valve. - Meanwhile, female and male
helical splines intermediate member 30, malehelical splines 23 are provided on an outer peripheral surface of theinner casing section 20, and female helical splines are formed at thespline engagement portion 17 of an inner circumferential surface of thespline case 16. Moreover, the inner andouter splines intermediate member 30 are provided as helical splines in opposite directions so that a slight movement of theintermediate member 30 in the axial direction can greatly vary the phase of theinner casing section 20 with respect to theouter casing section 10. A male screw portion 31 is formed on the outer circumferential surface of theintermediate member 30. - The
electromagnetic brake 40 is composed of anelectromagnetic clutch 42 for which an electromagnet (electromagnetic coil) 62 is provided in aclutch case 60 and afriction material 66 is fixedly fitted to the clutch case surface, arotary drum 44 made of a ferromagnetic material for receiving a braking force from thefriction material 66 of theelectromagnetic clutch 42, and a torsion coil spring 46 axially interposed between therotary drum 44 and theouter casing section 10.Pins 68 are engaged with holes provided in the engine case, so that theelectromagnetic clutch 42 is supported on the engine case so as to be movable in the axial direction but not be rotatable. Therotary drum 44 is supported so as to be rotatable on theinner casing section 20 by abearing 22 and is formed with afemale screw portion 45 to be screwed with the male screw portion 31 of theintermediate portion 30. When therotary drum 44 rotates relatively to theouter casing section 10, theintermediate member 30 moves in the axial direction as a result of the work of bothscrew sections 45 and 31. - When the
electromagnetic clutch 42 is off, since the braking force does not work on therotary drum 44, therotary drum 44 andouter casing section 10 are fixed at their initial positions by the torsion coil spring 46, theouter casing section 10,inner casing section 20,intermediate member 30, androtary drum 44 integrally rotate, and no phase difference occurs between theouter casing section 10 and theinner casing section 20. Then, since theinner casing section 20 has been coupled to thecamshaft 2 and theouter casing section 10 has been coupled with a crank pulley provided on the crankshaft by a chain, the intake valve or exhaust valve can be opened/closed at a normal timing according to rotation of the crankshaft.
When theelectromagnetic clutch 42 is turned on, a frictional braking force acts on thefriction material 66 provided on theelectromagnetic clutch 42 and therotary drum 44. When the braking force acts on therotary drum 44, therotary drum 44 experiences a rotational delay with respect to theouter casing section 10, theintermediate member 30 moves rightward in FIG. 7 as a result of the work of thespring portions 31 and 45, and owing to the inner and outerhelical splines intermediate member 30, theinner casing section 20 rotates relatively to theouter casing section 10, so that the phase difference between both varies. Then, therotary drum 44 is held at a position where the braking force balances with a spring force of the torsion coil spring 46. By controlling current to be supplied to the electromagnet of theelectromagnet clutch 42, theinner casing section 20 andouter casing section 10 can be controlled to have a desired phase difference. Thereby, the open/close timing of the intake valve or exhaust valve can be appropriately varied. - When the
electromagnetic clutch 42 is again turned off, the braking force no longer works on therotary drum 44, theintermediate member 30 rotates to its initial position as a result of the action of the torsion coil spring 46 and moves leftward in FIG. 7 to the initial position as a result of the work of thescrew portions 31 and 45. Then, theinner casing section 20 rotates to an initial position in a reverse direction with respect to theouter casing section 10 to eliminate the phase difference between both, and the intake valve or exhaust valve is opened/closed at a normal timing. - Meanwhile, friction
torque adding members flange 24 of theinner casing section 20 and sides of theflange engagement groove 13A of theouter casing section 10 so as to increase friction torque of a relative sliding portion between theouter casing section 10 and theinner casing section 20 and suppress gear rattle of the tooth portions hitting against each other from occurring at the helicalspline engagement portions intermediate member 30 and theouter casing section 10 andinner casing section 20. - Moreover, the phase varying device is internally supplied with engine oil through an
inlet 73a of thecamshaft 2, an oil channel in thecamshaft 2, and anoutlet 73b. The engine oil that has exited theoutlet 73b is supplied to a sliding surface between thefriction material 66 provided on the surface of theelectromagnetic clutch 42 and therotary drum 44 so as to prevent overheating between thefriction material 66 and therotary drum 44 owing to friction (see the following Patent Document 1 for details).
Patent Document 1:Japanese Published Unexamined Patent Application No. 2002-371814 - As described above, in the abovementioned phase varying device, when the sliding surface temperature reaches a high temperature owing to frictional heat on the relative sliding surface between the
friction material 66 and therotary drum 44, there is a possibility that the surface of the friction material generally formed of a porous material clogs up with reactants and insoluble contents of additives such as an antioxidant, a friction adjuster, and a detergent/dispersant dispersed in the engine oil and friction torque generated at thefriction material 66 androtary drum 44 is lowered, so that a cooling mechanism to allow the engine oil to flow between thefriction material 66 and therotary drum 44 is indispensable. Since the cooling mechanism is formed, the phase varying device has a complicated structure, thus resulting in a high cost, wherein a problem resides. - The present invention has been made in view of the problems described above and an object thereof is to prevent heat generation owing to friction in a phase varying device of an automobile engine.
- In order to achieve the aforementioned object, according to a first aspect of the invention, in a phase varying device of an engine including: an outer casing section having a sprocket to which rotation of a crankshaft of the engine is transmitted; an inner casing section capable of rotating relatively to the outer casing section and coupled with a camshaft for opening/closing an intake valve or an exhaust valve of the engine; and an intermediate member meshing with the outer casing section and the inner casing section through helical splines, relative rotation being generated between the outer casing section and the inner casing section by moving the intermediate member in an axial direction thus varying an open/close timing of the intake valve or the exhaust valve, the phase varying device of an engine is provided with an electromagnetic control means having a rotary drum being screwed on the intermediate member and provided as a permanent magnet and an electromagnetic clutch for braking the rotary drum.
- According to a second aspect of the invention, in the first aspect of the invention, a plurality of magnetic poles are formed on the rotary drums, and by arranging electromagnets in the electromagnetic clutch so that magnetic poles corresponding to the magnetic poles are also formed and changing polarity of the electromagnets with an appropriate phase relative to the magnetic poles of the rotary drum, the rotary drum is braked or accelerated.
- According to a third aspect of the invention, in the first or second aspect of the invention, the electromagnetic clutch is disposed in proximity to an interior side surface of the rotary drum.
- According to a fourth aspect of the invention, in the first or second aspect of the invention, only a vicinity of an outer circumference of the rotary drum is magnetized, and the electromagnetic clutch is arranged in proximity to the vicinity of the outer circumference of the rotary drum.
- By the phase varying device according to the first aspect of the invention, since the rotary drum is braked by an electromagnetic force between the electromagnets of the electromagnetic clutch and the rotary drum being a permanent magnet, no friction material is necessary. In addition, since the phase varying device never reaches a high temperature owing to frictional heat resulting from contact between the friction material of the electromagnetic clutch and the rotary drum, an effect to reduce deterioration of an engine oil is provided. In addition, no cooling mechanism for the electromagnetic clutch and rotary drum is necessary, so that not only is the structure simplified, but also malfunction hardly occurs and life is prolonged. Furthermore, for the phase varying device, the engine oil for cooling can be reduced, and no friction material is necessary, which is economical.
- By the second aspect of the invention, furthermore, a plurality of magnetic poles are formed on the rotary drums, and by arranging electromagnets in the electromagnetic clutch so that magnetic poles corresponding to the magnetic poles are also formed and changing polarity of the electromagnets with an appropriate phase relative to the magnetic poles of the rotary drum, a suction force or a repulsive force can be freely continuously generated between the electromagnetic clutch and the rotary drum, so that the rotary drum is freely braked or accelerated. Therefore, in the phase varying device, since the
electromagnetic clutch 42 allows both braking and acceleration of therotary drum 44, a torsion coil spring to return therotary drum 44 to its initial position is no longer necessary, and the number of components can be reduced. - By the third aspect of the invention, furthermore, since the electromagnetic clutch is disposed in proximity to an interior side surface of the rotary drum, the entire length of the phase varying device can be made shorter than that of the conventional device where the electromagnetic clutch is disposed in proximity to an exterior side surface of the rotary drum. In addition, when the entire length the same as that of the conventional art is allowable, the moving range of the intermediate member in the axial direction can be increased, so that the phase can be varied in a wider range than that of the conventional art.
- By the fourth aspect of the invention, furthermore, since only a vicinity of an outer circumference of the rotary drum is magnetized and the electromagnetic clutch is arranged in proximity to the vicinity of the outer circumference of the rotary drum, the entire length of the phase varying device can be further shortened. In addition, since the electromagnetic clutch is not provided lateral to the rotary drum, the rotary drum can also be reduced in diameter to reduce the moment of inertia so as to improve the phase varying device in responsiveness. Furthermore, even when the rotary drum moves in an axial direction, the rotary drum and electromagnetic clutch are always kept at an equal distance, so that highly accurate and stable phase control becomes possible.
- Now, embodiments of the present invention will be described based on drawings.
- A first embodiment according to an electromagnetic brake of a phase varying device of the present invention is shown in FIG. 1 and FIG. 2. FIG. 1(A) is a longitudinal sectional view of the phase varying device, FIG. 1(B) is a front view of a
rotary drum 44 of the phase varying device, and FIG. 1(C) is a front view of anelectromagnetic clutch 42 of the phase varying device. FIG. 2 is a diagram showing a current supplying circuit toelectromagnets 62 of theelectromagnetic clutch 42. - The phase varying device of the present embodiment is the same as the abovementioned conventional phase varying device except for an electromagnetic control means 40a formed of the
rotary drum 44 andelectromagnetic clutch 42 to be described later and the current supplying circuit to theelectromagnets 62 to be also described later. In the following, with respect to the present embodiment, description will be given of the electromagnetic control means 40a and current supplying circuit to theelectromagnets 62 while description of parts the same as those in the conventional device will be omitted. - In the electromagnetic control means 40a of the phase varying device, as shown in FIG. 1 (B), the
rotary drum 44 is provided as a permanent magnet strongly magnetized toward an axial direction so that six magnetic poles N and S of an alternate N-pole and S-pole appear along a circumferential direction, and as shown in FIG. 1(C), theelectromagnetic clutch 42 is arranged in proximity to an exterior side surface of therotary drum 44, and the three electromagnets (electromagnetic coils) 62 connected in series are arranged in a clutch case at positions corresponding to the magnetic poles N and S of therotary drum 44 along a circumferential direction. Moreover, the electromagnetic control means 40a is not provided with a torsion coil spring to urge therotary drum 44 to its initial position, and furthermore, theelectromagnetic clutch 42 is not movable in axial and radial directions with respect to theengine case 58 or not provided with a friction material that slidingly contacts therotary drum 44. - The current supplying circuit to the
electromagnets 62 is formed of, as shown in FIG. 2, four current controllers (transistors) 64a to 64d that control a current supplied from a power source Vcc to theelectromagnets 62 and acontroller 65 that sends control signals to the respectivecurrent controllers 64a to 64d. By alternately turning on and off a pair of thecurrent controllers current controllers controller 65, polarity of the electromagnets can be alternately changed. At this time, when a relative phase of theelectromagnets 62 to the magnetic poles N and S of therotary drum 44 is detected with an unillustrated appropriate rotation detection sensor so as to synchronize polarity switching of the current supplied to theelectromagnets 62 with rotation of therotary drum 44 and carry out control with an appropriate phase (a phase lag or a phase lead) relative to the magnetic poles N and S, it is possible to make only either a suction force or a repulsive force work continuously between therespective magnets 62 and therotary drum 44, whereby therotary drum 44 can be freely braked or accelerated. - In addition, to the
controller 65, signals from unillustrated rotation detection sensors respectively provided on an unillustrated crank pulley andcamshaft 2 have been received, and thecontroller 65 detects a phase of thecamshaft 2 with respect to the crank pulley. And, thecontroller 65 calculates a command phase difference according to engine revolutions, an accelerator position, and the like so as to control the phase of thecamshaft 2 with respect to the crank pulley. Namely, thecontroller 65 sends control signals to the respectivecurrent controllers 64a to 64d to brake or accelerate therotary drum 44 until the phase difference between the crank pulley andcamshaft 2 equals the command phase difference and controls the phase difference between the crank pulley andcamshaft 2 so as to coincide with the command phase difference . The rotation detection sensor used here to detect a phase of thecamshaft 2 with respect to the crank pulley can also be used as a phase detection sensor of theelectromagnets 62 to the magnetic poles N and S of therotary drum 44 described above. - According to the phase varying device of the present embodiment, since the
rotary drum 44 is braked or accelerated by a suction force or a repulsive force between theelectromagnets 62 of theelectromagnetic clutch 42 and therotary drum 44, no friction is generated between both, and therefore no friction material is necessary for theelectromagnetic clutch 42. In addition, according to the phase varying device, since the electromagnetic control means 40a never reaches a high temperature owing to frictional heat, no cooling mechanism is necessary, so that the structure is also simplified, and malfunction hardly occurs and life is prolonged. Moreover, engine oil for cooling can be reduced, and no friction material is necessary, which is economical. Furthermore, since theelectromagnetic clutch 42 allows both braking and acceleration of therotary drum 44, a torsion coil spring to return therotary drum 44 to its initial position is no longer necessary, and the number of components can be reduced. - In FIG. 3, a second embodiment according to a phase varying device of the present invention is shown. FIG. 3 (A) is a longitudinal sectional view of the phase varying device, FIG. 3(B) is a front view of a
rotary drum 44 of the phase varying device, and FIG. 3(C) is a front view of anelectromagnetic clutch 42 of the phase varying device. - The phase varying device is, as shown in FIG. 3(A), different from the aforementioned first embodiment in the arrangement of the
electromagnetic clutch 42 androtary drum 44 and the attaching method to anengine case 58. Namely, theelectromagnetic clutch 42 is arranged in proximity to an interior side surface of therotary drum 44 and is supported on a shaft portion 44a of therotary drum 44 via abearing 43 or the like. Furthermore, a pin 42a provided on theelectromagnetic clutch 42 is engaged with a rotation preventing groove 58a of theengine case 58 to restrict the electromagnetic clutch 42 from rotating. As a result of the engagement between the rotation preventing groove 58a and the pin 42a, the electromagnetic clutch 42 can move in an axial direction while keeping a distance from therotary drum 44 fixed. Other aspects are the same as those of the aforementioned first embodiment. - According to the phase varying device of the present embodiment, since the
electromagnetic clutch 42 is arranged inside therotary drum 44, the entire length can be made shorter than that of the aforementioned first embodiment. In addition, since theelectromagnetic clutch 42 keeps the distance from therotary drum 44 fixed, a braking force or an accelerating force applied to therotary drum 44 is kept fixed, so that highly accurate and stable phase control becomes possible. - In FIG. 4, a third embodiment according to a phase varying device of the present invention is shown. FIG. 4 (A) is a longitudinal sectional view of the phase varying device, FIG. 4(B) is a front view of a
rotary drum 44 of the phase varying device, and FIG. 4(C) is a front view of anelectromagnetic clutch 42 of the phase varying device. - The phase varying device is, as shown in FIG. 4(A), different from the aforementioned first embodiment in the point that the
electromagnetic clutch 42 is arranged in proximity to an outer circumference of therotary drum 44 and, as shown in FIG. 4(B), only a vicinity of the outer circumference of therotary drum 44 is magnetized, and is the same as the aforementioned first embodiment in other aspects. Here, since the magnitude of a magnetic force is greatly affected by the distance between the magnetic poles, even when only the vicinity of the outer circumference of therotary drum 44 is magnetized, a sufficient magnetic force can be obtained as the magnetic poles N and S and theelectromagnets 62 are close in distance. - According to the phase varying device of the present embodiment, since the
electromagnetic clutch 42 is arranged at the outer circumferential side of therotary drum 44, the entire length can be made shorter than that of the aforementioned first embodiment. In addition, since theelectromagnetic clutch 42 is not arranged lateral to therotary drum 44, therotary drum 44 can be reduced in diameter to reduce the moment of inertia so as to improve the phase varying device in responsiveness. Furthermore, even when therotary drum 44 moves in an axial direction, therotary drum 44 and electromagnetic clutch 42 are always kept at an equal distance, so that highly accurate and stable phase control becomes possible. - However, the present invention is not limited to the aforementioned embodiments. For example, modifications can be made as follows.
- The
rotary drum 44 and electromagnetic clutch 42 can be modified as shown in FIG. 5 and FIG. 6. Here, FIG. 5 (A) is a front view of therotary drum 44 of the phase varying device, FIG. 5(B) is a sectional view along a line V-V of FIG. 5(A), FIG. 6 (A) is a front view of theelectromagnetic clutch 42 of the phase varying device, and FIG. 6(B) is a side view of theelectromagnetic clutch 42. Namely, it is not necessary to provide magnetic poles N and S formed on therotary drum 44 alternately along the circumferential direction of therotary drum 44 as in the aforementioned respective embodiments, the identical poles N (or S) may be arranged at equal intervals along the circumferential direction of therotary drum 44 as shown in FIG. 5, it is not necessary forelectromagnets 62 included in the electromagnetic clutch 42 to orient their axial directions along the circumferential direction of the electromagnetic clutch 42 as in the aforementioned respective embodiments, and these may be oriented in a direction orthogonal to the electromagnetic clutch 42 as shown in FIG. 6. - In addition, it is not necessary to provide the magnetic poles N and S formed on the
rotary drum 44 as six poles as in the aforementioned respective embodiments, and the poles may be of any number equal to or more than two. As a matter of course, it is also not necessary to equalize the number of poles of theelectromagnets 62 provided in the electromagnetic clutch 42 to the number of magnetic poles N and S formed on therotary drum 44, and these may be arranged in any form with any number as long as a suction force or a repulsive force is continuously given to therotary drum 44 by theelectromagnets 62. - Furthermore, in the aforementioned second embodiment where the
electromagnetic clutch 42 is arranged inside therotary drum 44, the electromagnetic clutch 42 can move in the axial direction while keeping the distance from therotary drum 44 fixed, however, in order to simplify the structure, the electromagnetic clutch 42 may be fixedly fitted to theengine case 58 so as not to be movable in the axial direction. - Furthermore, in the aforementioned respective embodiments, the electromagnetic control means 40a can carry out either braking or acceleration of the
rotary drum 44, however, the electromagnetic control means 40a may carry out only braking. In this case, a torsion coil spring to urge therotary drum 44 to its initial position is indispensable. Since such a torsion coil spring makes the engine drivable even when theelectromagnetic clutch 42 has malfunctioned, a weak torsion coil spring may be provided in the aforementioned first to third embodiments as well. -
- [FIG. 1] Views explaining a phase varying device according to a first embodiment of the present invention.
- [FIG. 2] A diagram explaining a current supplying circuit to electromagnets of the phase varying device according to the first embodiment.
- [FIG. 3] Views explaining a phase varying device according to a second embodiment of the present invention.
- [FIG. 4] Views explaining a phase varying device according to a third embodiment of the present invention.
- [FIG. 5] Views explaining a modification of a rotary drum of a phase varying device according to the present invention .
- [FIG. 6] Views explaining a modification of an electromagnetic clutch of a phase varying device according to the present invention.
- [FIG. 7] A longitudinal sectional view of a conventional phase varying device.
-
- 2 Camshaft
- 10 Outer casing section
- 12 Sprocket
- 20 Inner casing section
- 30 Intermediate member
- 40a Electromagnetic control means
- 42 Electromagnetic clutch
- 44 Rotary drum
- 62 Electromagnet
- N, S Magnetic pole
Claims (4)
- A phase varying device of an engine comprising: an outer casing section having a sprocket to which rotation of a crankshaft of the engine is transmitted; an inner casing section capable of rotating relatively to the outer casing section and coupled with a camshaft for opening/closing an intake valve or an exhaust valve of the engine; and an intermediate member meshing with the outer casing section and the inner casing section through helical splines, relative rotation being generated between the outer casing section and the inner casing section by moving the intermediate member in an axial direction thus varying an open/close timing of the intake valve or the exhaust valve, wherein
the phase varying device of an engine comprises an electromagnetic control means having a rotary drum being screwed on the intermediate member and provided as a permanent magnet and an electromagnetic clutch for braking the rotary drum. - The phase varying device of an engine according to Claim 1, wherein a plurality of magnetic poles are formed on the rotary drums, and by arranging electromagnets in the electromagnetic clutch so that magnetic poles corresponding to the magnetic poles are also formed and changing polarity of the electromagnets with an appropriate phase relative to the magnetic poles of the rotary drum, the rotary drum is braked or accelerated.
- The phase varying device of an engine according to Claim 1 or 2, wherein the electromagnetic clutch is disposed in proximity to an interior side surface of the rotary drum.
- The phase varying device of an engine according to Claim 1 or 2, wherein only a vicinity of an outer circumference of the rotary drum is magnetized, and the electromagnetic clutch is arranged in proximity to the vicinity of the outer circumference of the rotary drum.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004254659 | 2004-09-01 | ||
PCT/JP2005/014071 WO2006025173A1 (en) | 2004-09-01 | 2005-08-02 | Phase varying device of engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1832719A1 true EP1832719A1 (en) | 2007-09-12 |
EP1832719A4 EP1832719A4 (en) | 2010-10-13 |
Family
ID=35999834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05768419A Withdrawn EP1832719A4 (en) | 2004-09-01 | 2005-08-02 | Phase varying device of engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090260590A1 (en) |
EP (1) | EP1832719A4 (en) |
JP (1) | JPWO2006025173A1 (en) |
KR (1) | KR20070047284A (en) |
CN (1) | CN1993538A (en) |
WO (1) | WO2006025173A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2261469A1 (en) * | 2008-02-27 | 2010-12-15 | Nittan Valve Co., Ltd. | Engine valve controller |
WO2011147505A3 (en) * | 2010-05-27 | 2012-01-19 | Daimler Ag | Control device for an internal combustion engine |
EP2518284A1 (en) * | 2009-12-22 | 2012-10-31 | Nittan Valve Co., Ltd. | Structure for locking electromagnetic clutch in phase changing device of engine |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4519799B2 (en) * | 2006-04-14 | 2010-08-04 | 日鍛バルブ株式会社 | Engine phase variable device |
EP2093387B1 (en) * | 2006-12-11 | 2012-09-12 | Nittan Valve Co., Ltd. | Phase variable device of engine |
EP1972762B1 (en) | 2007-03-23 | 2011-08-03 | Ford Global Technologies, LLC | Phase adjusting device |
JP5047310B2 (en) * | 2008-02-04 | 2012-10-10 | 日鍛バルブ株式会社 | Phase variable device for automobile engine |
CN102325968B (en) * | 2009-02-23 | 2015-07-01 | 日锻汽门株式会社 | Phase-variable device for engine |
JP4905843B2 (en) * | 2010-02-23 | 2012-03-28 | 株式会社デンソー | Valve timing adjustment device |
DE102010039861A1 (en) * | 2010-08-27 | 2012-03-01 | Zf Friedrichshafen Ag | Valve gear of a combustion piston engine |
JP5814059B2 (en) * | 2011-09-28 | 2015-11-17 | 本田技研工業株式会社 | Internal combustion engine |
CN105164380B (en) * | 2013-05-02 | 2018-01-23 | 戴姆勒股份公司 | Adjusting apparatus, the adjusting apparatus for being particularly the camshaft for being used to adjust internal combustion engine |
JP6225750B2 (en) * | 2014-02-27 | 2017-11-08 | アイシン精機株式会社 | Valve timing control device |
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JPS50139315A (en) * | 1974-04-26 | 1975-11-07 | ||
JPS58166287U (en) * | 1982-04-27 | 1983-11-05 | 東芝テック株式会社 | stepping motor |
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JP3958665B2 (en) * | 2002-10-10 | 2007-08-15 | 日鍛バルブ株式会社 | Camshaft phase varying device for automobile engine |
DE102004033522A1 (en) * | 2004-07-10 | 2006-02-09 | Ina-Schaeffler Kg | Camshaft adjuster with electric drive |
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2005
- 2005-08-02 CN CNA2005800259547A patent/CN1993538A/en active Pending
- 2005-08-02 KR KR1020077001161A patent/KR20070047284A/en not_active Application Discontinuation
- 2005-08-02 EP EP05768419A patent/EP1832719A4/en not_active Withdrawn
- 2005-08-02 WO PCT/JP2005/014071 patent/WO2006025173A1/en active Application Filing
- 2005-08-02 US US11/573,386 patent/US20090260590A1/en not_active Abandoned
- 2005-08-02 JP JP2006531469A patent/JPWO2006025173A1/en active Pending
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2261469A1 (en) * | 2008-02-27 | 2010-12-15 | Nittan Valve Co., Ltd. | Engine valve controller |
EP2261469A4 (en) * | 2008-02-27 | 2011-10-12 | Nittan Valva | Engine valve controller |
US8381694B2 (en) | 2008-02-27 | 2013-02-26 | Nittan Valve Co., Ltd. | Engine valve controller |
EP2518284A1 (en) * | 2009-12-22 | 2012-10-31 | Nittan Valve Co., Ltd. | Structure for locking electromagnetic clutch in phase changing device of engine |
EP2518284A4 (en) * | 2009-12-22 | 2014-12-03 | Nittan Valva | Structure for locking electromagnetic clutch in phase changing device of engine |
WO2011147505A3 (en) * | 2010-05-27 | 2012-01-19 | Daimler Ag | Control device for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
US20090260590A1 (en) | 2009-10-22 |
EP1832719A4 (en) | 2010-10-13 |
KR20070047284A (en) | 2007-05-04 |
WO2006025173A1 (en) | 2006-03-09 |
JPWO2006025173A1 (en) | 2008-05-08 |
CN1993538A (en) | 2007-07-04 |
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