US20010039930A1 - Valve resting mechanism for cylinder control type engine - Google Patents
Valve resting mechanism for cylinder control type engine Download PDFInfo
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- US20010039930A1 US20010039930A1 US09/778,912 US77891201A US2001039930A1 US 20010039930 A1 US20010039930 A1 US 20010039930A1 US 77891201 A US77891201 A US 77891201A US 2001039930 A1 US2001039930 A1 US 2001039930A1
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- United States
- Prior art keywords
- rocker arm
- pin
- valve
- control type
- type engine
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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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L2001/188—Fulcrums at upper surface
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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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/03—Auxiliary actuators
- F01L2820/031—Electromagnets
Definitions
- the present invention relates to a valve resting mechanism for a multi-cylinder engine. More particularly, the invention relates to a valve resting mechanism for a cylinder control type engine, for retaining a proper running state for an engine load by resting the multiple cylinders partially according to the acting state of the engine.
- valve actuating mechanism capable of performing a drive resting the cylinders partially or changing the valve timing
- a valve actuating mechanism for the engine to make it easy to return from the partially rested run to the run with all the cylinders being active or to change the valve timing.
- An object of the invention is to solve the above-specified problems and to provide a valve resting mechanism for a cylinder control type engine, which can improve the combustion efficiency at the idling time and at the low speed/under the low load and can simplify the valve actuating mechanism of the engine.
- an overhead cam engine comprising: a cylinder head fixed on a cylinder block having multiple cylinders; an intake/exhaust valve for opening/closing an intake/exhaust port formed in the cylinder head; and a cam type valve actuating mechanism disposed over the cylinder head for actuating the intake/exhaust valve for the opening/closing actions
- the cam type valve actuating mechanism including: a cam formed on a camshaft made rotatable according to the rotation of the engine; and a rocker arm adapted to rock on a rocker arm shaft in accordance with the rotation of the cam, for giving the opening/closing actions to the intake/exhaust valve
- a valve resting mechanism for a cylinder control type engine wherein the improvement resides: in that the rocker arm includes a first rocker arm and a second rocker arm for rocking independently of each other on the rocker arm shaft, the first rocker arm being adapted to rock when given the rotational motion
- One of the engagement portions formed on the first and second rocker arms is formed at the boss portion of the first rocker arm by a pin guide hole for guiding the pin slidably, whereas the other engagement portion is formed at the boss portion of the second rocker arm by an engagement hole to be engaged by the pin.
- the pin is inserted at all times into the pin guide hole of the first rocker arm and is biased in a direction to come out of the engagement hole of the second rocker arm by a return spring which is arranged between the head of the pin and the boss portion.
- the electromagnetic drive device includes: a movable element for sliding the pin in the axial direction; a stator for establishing an electromagnet; and a clearance between the movable element and the stator for regulating the sliding extent of the movable element in the axial direction.
- the sliding stroke of the pin is controlled by the sliding extent of the movable element.
- the pin and the movable element are mutually slidable toward the center of the rocking fulcrum of the rocker arm from the sliding faces of the engagement portions.
- the pin rocks while engaging at all times with the engagement portion of the first rocker arm and is brought by the sliding motion of the movable element into rocking engagement with the engagement portions of both the first and second rocker arms.
- the first rocker arm and the second rocker arm are provided with return springs so that they may rock while following the motions of the cam and the intake/exhaust valve at all times.
- valve resting mechanisms are provided separately to separate cylinders so that they can operate independently for separate cylinders, and the engagement or disengagement of the such mechanisms with or from the first rocker arm and the second rocker arm provided to each cylinder are controlled mechanism by mechanism according to the running state of the engine.
- the stator of the electromagnetic drive device includes: a case fixed on the cylinder head through a bracket; a yoke arranged in the case; and an exciting coil arranged in the yoke.
- the electromagnetic drive device includes a permanent magnet midway of the iron core for forming a magnetic path so that the movable element may be self-retained.
- this valve resting mechanism for the cylinder control type engine can control the valve drive and the valve rest simply with or without the drive of the electromagnetic drive device so that the responding speed of the drive control is better improved than that of the hydraulic valve resting mechanism of the prior art.
- valve drive is partially inactivated to rest the cylinders partially so that the engine can be run with a proper number of cylinders to improve the combustion efficiency. According to the invention, therefore, the pumping loss can be lowered to improve the thermal efficiency.
- the intake valve and the exhaust valve can be assembled and controlled separately for the individual cylinders so that they can cope with the various cylinder controls.
- FIG. 1 is a schematic diagram of a valve resting mechanism of a cylinder control type engine according to the invention
- FIG. 2 is a sectional view of an electromagnetic drive device
- FIG. 3 is an exploded view of a rocker arm
- FIG. 4 is an explanatory diagram showing the state where the leading end portion of a pin is inserted into an engagement hole of a second rocker arm;
- FIG. 5 is an explanatory diagram showing the state where first and second rocker arms rock together to open intake/exhaust valves
- FIG. 6 is an explanatory diagram showing the state where the leading end portion of the pin is retracted from the engagement hole of the second rocker arm.
- FIG. 7 is an explanatory diagram showing the state where only the first rocker arm is rocked by a cam while leaving the intake/exhaust valves unopened.
- An overhead cam type engine having a valve resting mechanism is constructed to include: a cylinder head 4 fixed in the (not-shown) cylinder block having multiple cylinders; an intake/exhaust valve 2 for opening/closing an intake/exhaust port 5 formed in the cylinder head 4 ; and a cam type valve actuating mechanism 3 formed over the cylinder head 4 for opening/closing the intake/exhaust valve 2 .
- a gasket 44 there is attached through a gasket 44 a cylinder head liner 27 forming a combustion chamber.
- a valve seat 45 on which the intake/exhaust valve 2 is seated.
- the reference numeral 54 denotes a cylinder head cover.
- a valve stem 20 of the intake/exhaust valve 2 is reciprocated by the guide of a valve guide 21 which is arranged in a through hole formed in the cylinder head 4 .
- a valve guide 21 which is arranged in a through hole formed in the cylinder head 4 .
- a cotter 23 At the end portion of the valve stem 20 , there is fixed a cotter 23 , to which a valve spring retainer 18 is attached.
- On the upper face of the cylinder head 4 there is disposed a valve spring retainer 26 . Between these two valve spring retainers 18 and 26 , moreover, there is arranged a valve spring 19 for returning the intake/exhaust valve 2 in a closing direction.
- the cam type valve actuating mechanism 3 is provided with: a cam 6 formed on a camshaft 7 made rotatable according to the rotation of the engine; and a rocker arm 25 for rocking on a rocker arm shaft 8 in accordance with the rotation of the cam 6 to open/close the intake/exhaust valve 2 .
- This cam type valve actuating mechanism 3 rocks the rocker arm 25 on the rocker arm shaft 8 in accordance with the rotation of the cam 6 , and this rocking motion is transmitted through a valve adjusting screw 28 , as attached to the leading end of the rocker arm 25 , to a tappet 17 carried on the end portion of the valve stem 20 , so that it is converted into a push-down motion of the tappet 17 .
- Reference numeral 29 designates a nut for fixing the valve adjusting screw 28 on the rocker arm 25 .
- the rocker arm 25 is constructed of a first rocker arm 9 and a second rocker arm 10 for rocking independently of each other on the rocker arm shaft 8 such that the first rocker arm 9 is rocked by the rotational motion of the cam 6 and such that the second rocker arm 10 opens/closes the intake/exhaust valve 2 .
- On these first and second rocker arms 9 and 10 there are individually formed engagement portions to be engaged by a pin 11 which is slidably moved by an electromagnetic drive device 1 .
- These engagement portions are characterized in that the rocking motion is transmitted from the first rocker arm 9 to the second rocker arm 10 in the engaged state where the pin 11 is engaged by both the engagement portions whereas the rocking motion is not transmitted from the first rocker arm 9 to the second rocker arm 10 in the disengaged state where the pin 11 is not engaged by the engagement portion of the second rocker arm 10 .
- the engagement portion at the first rocker arm 9 is formed of a pin guide hole 13 which is formed in a boss portion 46 of the first rocker arm 9 for guiding the pin 11 slidably, as shown in FIG. 3.
- the engagement portion at the second rocker arm 10 is formed of an engagement hole 12 which is formed in a boss portion 47 of the second rocker arm 10 for engaging with the pin 11 .
- this pin 11 is biased in a direction to come out of the engagement hole 12 of the second rocker arm 10 by a return spring 22 which is arranged between the head of the pin 11 and the upper face of the boss portion 46 , as shown in FIG. 1.
- the electromagnetic drive device 1 includes: a movable element 14 for sliding the pin 11 axially; and a stator 15 for establishing an electromagnet, and has a clearance formed between the movable element 14 and the stator 15 for regulating the axial sliding extent of the movable element 14 , as shown in FIG. 2.
- the stator 15 is constructed to include: a case 30 fixed on the cylinder head 4 through a bracket 31 ; a lower yoke 34 and an upper yoke 32 arranged in the recess of the case 30 for forming a magnetic core; and an annular exciting coil 33 arranged concentrically in an annular portion defined by the upper and lower yokes 32 and 34 .
- the movable element 14 is constructed to include: a plunger 53 ; a cylindrical plunger 41 fitted on the plunger 53 and fixed on the upper end portion 39 of the plunger 53 by a nut 38 ; and a push portion 40 formed at the lower end of the plunger 53 .
- the lower yoke 34 is formed of a bottom plate 34 a and a cylindrical portion 34 b erected on the bottom plate 34 a , which has a hole formed to have a diameter equal to that internal diameter of the cylindrical portion 34 b .
- the upper yoke 32 is formed of a cylindrical portion 32 a and a cover portion 32 b attached to the upper end of the cylindrical portion 32 a . In the cover portion 32 b , there is formed a hole, through which the cylindrical plunger 41 extends.
- the movable element 14 protrudes downward from a hollow portion 50 of the stator 15 so that the lower end face 51 of its push portion 40 comes into abutment against the upper end face 52 of the pin 11 , as shown in FIG. 1, to push down the pin 11 .
- This pin 11 has a sliding stroke controlled by the sliding extent of the movable element 14 , that is, by the gap of a clearance 35 which is defined between a funnel-shaped end face at the upper end of the cylindrical portion 34 b of the lower yoke 34 and a conical end face at the lower end of the cylindrical plunger 41 .
- the pin 11 and the movable element 14 are mutually slidable toward the center of the rocking fulcrum of the rocker arm 25 from the sliding faces of the engagement portions.
- the stator 15 of the electromagnetic drive device 1 can be added after the assembly by attaching it to the bracket 31 supporting the rocker arm shaft 8 rotatably, as shown in FIG. 2, so that it can be assembled and controlled for each cylinder or for every intake and exhaust valves 2 .
- the pin 11 rocks always in engagement with the pin guide hole 13 of the first rocker arm 9 , and the rocker arm 25 can rock when the pin 11 is slid into engagement with the engagement hole 12 of the second rocker arm 10 by the movable element 14 .
- the first rocker arm 9 and the second rocker arm 12 are equipped with a return spring 24 so that they may rock at all times while following the motions of the cam 6 and the intake/exhaust valve 2 . In short, the return spring 24 performs a function to cause the first rocker arm 9 to follow the cam 6 .
- valve resting mechanism of this cylinder control type engine is provided for each cylinder so that it may act independently for each cylinder, and the engagement/disengagement of the first rocker arm 9 and the second rocker arm 10 of each cylinder are individually controlled according to the running state of the engine.
- the bracket 31 is fixed on a holding member 16 over the cylinder head 4 by means of bolts 36 .
- the case 30 which is fixed on the bracket 31 by means of a knock-pin 48 .
- a cover 37 is attached to the case 30 .
- the lower yoke 34 of the electromagnet which constructs the stator 15 .
- the annular upper yoke 32 On the lower yoke 34 , there is fixed the annular upper yoke 32 .
- the exciting coil 33 which is arranged in an annular shape.
- the plunger 53 which constructs the movable element 14 .
- the lower end face 51 of the push portion 40 of the plunger 53 forms the sliding face to come into sliding abutment against the pin 11 .
- the clearance 35 is formed between the lower end face of the cylindrical plunger 41 and the upper end face of the lower yoke 34 so that it defines the stroke of the sliding motion of the movable element 14 .
- the lefthand movable element 14 is in the state where it is lifted by the exciting coil 33 energized, but the righthand movable element 14 is in the state where it is not lifted because the exciting coil 33 is deenergized.
- the bracket 31 has an oil filler port 42 for feeding a lubricant so that the movable element 14 may slide smoothly.
- this valve resting mechanism of the cylinder control type engine could be constructed such that a permanent magnet is disposed midway of the upper yoke 32 , i.e., the magnetic core for forming the magnetic path, although not shown, so that the movable element 14 may be self-restrained by the permanent magnet. In this modification, it is possible to reduce the power consumption at the time when the electromagnet is energized.
- this valve resting mechanism of the cylinder control type engine acts in the following manners.
- the electromagnet of the electromagnetic drive device 1 is excited.
- the cylindrical plunger 41 of the movable element 14 is attached by the magnetic pole, i.e., the upper end of the cylindrical portion 34 b of the lower yoke 34 so that the movable element 14 is lifted to push down the pin 11 .
- the pin 11 slides down in the pin guide hole 13 formed in the first rocker arm 9 and comes into engagement with the engagement hole 12 of the second rocker arm 10 .
- the electromagnet of the electromagnetic drive device 1 of the selected cylinder is unexcited to the inactive state.
- the pin 11 is returned upward by the return spring 22 , as shown in FIG. 6, so that the movable element 14 of the electromagnetic drive device 1 is returned upward by the return of the pin 11 .
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- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
- The present invention relates to a valve resting mechanism for a multi-cylinder engine. More particularly, the invention relates to a valve resting mechanism for a cylinder control type engine, for retaining a proper running state for an engine load by resting the multiple cylinders partially according to the acting state of the engine.
- Most of multi-cylinder engines of the prior art are run by feeding the fuel and air individually homogeneously to all the cylinders according to a load all over drive ranges because they are restricted on the mechanism of a valve actuating system.
- In the valve actuating mechanism capable of performing a drive resting the cylinders partially or changing the valve timing, on the other hand, there is known (see for example Japanese patent application Kokai publications No. 6-299828 and No. 7-49016) a valve actuating mechanism for the engine to make it easy to return from the partially rested run to the run with all the cylinders being active or to change the valve timing.
- In the multi-cylinder engine of the type in which the fuel and air are fed individually homogeneously to all the cylinders in accordance with the load all over the drive ranges, however, the combustion efficiency at an idling time or at a low speed/under a low load is generally so poor as to increase the pumping loss thereby to raise a problem that the thermal efficiency is lowered. On the other hand, the valve actuating mechanism of the engine, as disclosed in Japanese patent application Kokai publication No. 6-299828, has such a complicated mechanism as to raise another problem that its assembly and control are troublesome.
- An object of the invention is to solve the above-specified problems and to provide a valve resting mechanism for a cylinder control type engine, which can improve the combustion efficiency at the idling time and at the low speed/under the low load and can simplify the valve actuating mechanism of the engine.
- In an overhead cam engine comprising: a cylinder head fixed on a cylinder block having multiple cylinders; an intake/exhaust valve for opening/closing an intake/exhaust port formed in the cylinder head; and a cam type valve actuating mechanism disposed over the cylinder head for actuating the intake/exhaust valve for the opening/closing actions, the cam type valve actuating mechanism including: a cam formed on a camshaft made rotatable according to the rotation of the engine; and a rocker arm adapted to rock on a rocker arm shaft in accordance with the rotation of the cam, for giving the opening/closing actions to the intake/exhaust valve, according to an aspect of the invention, there is provided a valve resting mechanism for a cylinder control type engine, wherein the improvement resides: in that the rocker arm includes a first rocker arm and a second rocker arm for rocking independently of each other on the rocker arm shaft, the first rocker arm being adapted to rock when given the rotational motion of the cam, the second rocker arm being adapted to give the opening/closing actions to the intake/exhaust valve; in that the first and second rocker arms have individual engagement portions, with which a pin to be slidably moved by an electromagnetic drive device comes into engagement; and in that the rocking motion is transmitted from the first rocker arm to the second rocker arm in the engaged state where the pin is engaged by both the engagement portions whereas the rocking motion is not transmitted from the first rocker arm to the second rocker arm in the disengaged state where the pin is not engaged by the engagement portion of the second rocker arm.
- One of the engagement portions formed on the first and second rocker arms is formed at the boss portion of the first rocker arm by a pin guide hole for guiding the pin slidably, whereas the other engagement portion is formed at the boss portion of the second rocker arm by an engagement hole to be engaged by the pin. Moreover, the pin is inserted at all times into the pin guide hole of the first rocker arm and is biased in a direction to come out of the engagement hole of the second rocker arm by a return spring which is arranged between the head of the pin and the boss portion.
- The electromagnetic drive device includes: a movable element for sliding the pin in the axial direction; a stator for establishing an electromagnet; and a clearance between the movable element and the stator for regulating the sliding extent of the movable element in the axial direction.
- The sliding stroke of the pin is controlled by the sliding extent of the movable element. The pin and the movable element are mutually slidable toward the center of the rocking fulcrum of the rocker arm from the sliding faces of the engagement portions. On the other hand, the pin rocks while engaging at all times with the engagement portion of the first rocker arm and is brought by the sliding motion of the movable element into rocking engagement with the engagement portions of both the first and second rocker arms.
- The first rocker arm and the second rocker arm are provided with return springs so that they may rock while following the motions of the cam and the intake/exhaust valve at all times.
- In this cylinder control type engine, valve resting mechanisms are provided separately to separate cylinders so that they can operate independently for separate cylinders, and the engagement or disengagement of the such mechanisms with or from the first rocker arm and the second rocker arm provided to each cylinder are controlled mechanism by mechanism according to the running state of the engine.
- The stator of the electromagnetic drive device includes: a case fixed on the cylinder head through a bracket; a yoke arranged in the case; and an exciting coil arranged in the yoke. On the other hand, the electromagnetic drive device includes a permanent magnet midway of the iron core for forming a magnetic path so that the movable element may be self-retained.
- With the valve resting mechanism for the cylinder control type engine being thus constructed, when the electromagnetic drive device is activated in response to the high speed/the high load of the engine, the pin slides and moves so that the first and second rocker arms can be connected to each other to open/close the intake/exhaust valve.
- When the electromagnetic drive device for the cylinder selected is inactivated, on the other hand, the pin of the corresponding cylinder is returned to the initial position by the return spring so that the first and second rocker arms come into the disconnected state. Then, even if the first rocker arm rocks according to the rotation of the cam, the second rocker arm does not rock to rest the selected cylinder.
- Therefore, this valve resting mechanism for the cylinder control type engine can control the valve drive and the valve rest simply with or without the drive of the electromagnetic drive device so that the responding speed of the drive control is better improved than that of the hydraulic valve resting mechanism of the prior art.
- At the idling time or at the low speed/under the low load, moreover, the valve drive is partially inactivated to rest the cylinders partially so that the engine can be run with a proper number of cylinders to improve the combustion efficiency. According to the invention, therefore, the pumping loss can be lowered to improve the thermal efficiency. In this valve resting mechanism for the cylinder control type engine, moreover, the intake valve and the exhaust valve can be assembled and controlled separately for the individual cylinders so that they can cope with the various cylinder controls.
- FIG. 1 is a schematic diagram of a valve resting mechanism of a cylinder control type engine according to the invention;
- FIG. 2 is a sectional view of an electromagnetic drive device;
- FIG. 3 is an exploded view of a rocker arm;
- FIG. 4 is an explanatory diagram showing the state where the leading end portion of a pin is inserted into an engagement hole of a second rocker arm;
- FIG. 5 is an explanatory diagram showing the state where first and second rocker arms rock together to open intake/exhaust valves;
- FIG. 6 is an explanatory diagram showing the state where the leading end portion of the pin is retracted from the engagement hole of the second rocker arm; and
- FIG. 7 is an explanatory diagram showing the state where only the first rocker arm is rocked by a cam while leaving the intake/exhaust valves unopened.
- An embodiment of the invention will be described with reference to the accompanying drawings.
- An overhead cam type engine having a valve resting mechanism according to the invention is constructed to include: a
cylinder head 4 fixed in the (not-shown) cylinder block having multiple cylinders; an intake/exhaust valve 2 for opening/closing an intake/exhaust port 5 formed in thecylinder head 4; and a cam typevalve actuating mechanism 3 formed over thecylinder head 4 for opening/closing the intake/exhaust valve 2. To thecylinder head 4, there is attached through a gasket 44 acylinder head liner 27 forming a combustion chamber. In thiscylinder head liner 27, there is formed avalve seat 45, on which the intake/exhaust valve 2 is seated. Thereference numeral 54 denotes a cylinder head cover. - A
valve stem 20 of the intake/exhaust valve 2 is reciprocated by the guide of avalve guide 21 which is arranged in a through hole formed in thecylinder head 4. At the end portion of thevalve stem 20, there is fixed acotter 23, to which avalve spring retainer 18 is attached. On the upper face of thecylinder head 4, there is disposed avalve spring retainer 26. Between these twovalve spring retainers valve spring 19 for returning the intake/exhaust valve 2 in a closing direction. - The cam type
valve actuating mechanism 3 is provided with: acam 6 formed on acamshaft 7 made rotatable according to the rotation of the engine; and arocker arm 25 for rocking on a rocker arm shaft 8 in accordance with the rotation of thecam 6 to open/close the intake/exhaust valve 2. This cam typevalve actuating mechanism 3 rocks therocker arm 25 on the rocker arm shaft 8 in accordance with the rotation of thecam 6, and this rocking motion is transmitted through avalve adjusting screw 28, as attached to the leading end of therocker arm 25, to atappet 17 carried on the end portion of thevalve stem 20, so that it is converted into a push-down motion of thetappet 17. By this push-down motion of thetappet 17, the opening/closing motion is transmitted to the intake/exhaust valve 2.Reference numeral 29 designates a nut for fixing thevalve adjusting screw 28 on therocker arm 25. - In the valve resting mechanism of this cylinder control type engine, the
rocker arm 25 is constructed of afirst rocker arm 9 and asecond rocker arm 10 for rocking independently of each other on the rocker arm shaft 8 such that thefirst rocker arm 9 is rocked by the rotational motion of thecam 6 and such that thesecond rocker arm 10 opens/closes the intake/exhaust valve 2. On these first andsecond rocker arms pin 11 which is slidably moved by anelectromagnetic drive device 1. These engagement portions are characterized in that the rocking motion is transmitted from thefirst rocker arm 9 to thesecond rocker arm 10 in the engaged state where thepin 11 is engaged by both the engagement portions whereas the rocking motion is not transmitted from thefirst rocker arm 9 to thesecond rocker arm 10 in the disengaged state where thepin 11 is not engaged by the engagement portion of thesecond rocker arm 10. - The engagement portion at the
first rocker arm 9 is formed of apin guide hole 13 which is formed in aboss portion 46 of thefirst rocker arm 9 for guiding thepin 11 slidably, as shown in FIG. 3. On the other hand, the engagement portion at thesecond rocker arm 10 is formed of anengagement hole 12 which is formed in aboss portion 47 of thesecond rocker arm 10 for engaging with thepin 11. On the other hand, thispin 11 is biased in a direction to come out of theengagement hole 12 of thesecond rocker arm 10 by areturn spring 22 which is arranged between the head of thepin 11 and the upper face of theboss portion 46, as shown in FIG. 1. - The
electromagnetic drive device 1 includes: amovable element 14 for sliding thepin 11 axially; and astator 15 for establishing an electromagnet, and has a clearance formed between themovable element 14 and thestator 15 for regulating the axial sliding extent of themovable element 14, as shown in FIG. 2. - The
stator 15 is constructed to include: acase 30 fixed on thecylinder head 4 through abracket 31; alower yoke 34 and anupper yoke 32 arranged in the recess of thecase 30 for forming a magnetic core; and an annularexciting coil 33 arranged concentrically in an annular portion defined by the upper andlower yokes movable element 14 is constructed to include: aplunger 53; acylindrical plunger 41 fitted on theplunger 53 and fixed on theupper end portion 39 of theplunger 53 by anut 38; and apush portion 40 formed at the lower end of theplunger 53. - The
lower yoke 34 is formed of abottom plate 34 a and acylindrical portion 34 b erected on thebottom plate 34 a, which has a hole formed to have a diameter equal to that internal diameter of thecylindrical portion 34 b. On the other hand, theupper yoke 32 is formed of acylindrical portion 32 a and acover portion 32 b attached to the upper end of thecylindrical portion 32 a. In thecover portion 32 b, there is formed a hole, through which thecylindrical plunger 41 extends. - In the
electromagnetic drive device 1, when theexciting coil 33 of thestator 15 is energized, themovable element 14 protrudes downward from ahollow portion 50 of thestator 15 so that thelower end face 51 of itspush portion 40 comes into abutment against theupper end face 52 of thepin 11, as shown in FIG. 1, to push down thepin 11. Thispin 11 has a sliding stroke controlled by the sliding extent of themovable element 14, that is, by the gap of aclearance 35 which is defined between a funnel-shaped end face at the upper end of thecylindrical portion 34 b of thelower yoke 34 and a conical end face at the lower end of thecylindrical plunger 41. Thepin 11 and themovable element 14 are mutually slidable toward the center of the rocking fulcrum of therocker arm 25 from the sliding faces of the engagement portions. On the other hand, thestator 15 of theelectromagnetic drive device 1 can be added after the assembly by attaching it to thebracket 31 supporting the rocker arm shaft 8 rotatably, as shown in FIG. 2, so that it can be assembled and controlled for each cylinder or for every intake andexhaust valves 2. - The
pin 11 rocks always in engagement with thepin guide hole 13 of thefirst rocker arm 9, and therocker arm 25 can rock when thepin 11 is slid into engagement with theengagement hole 12 of thesecond rocker arm 10 by themovable element 14. Thefirst rocker arm 9 and thesecond rocker arm 12 are equipped with areturn spring 24 so that they may rock at all times while following the motions of thecam 6 and the intake/exhaust valve 2. In short, thereturn spring 24 performs a function to cause thefirst rocker arm 9 to follow thecam 6. - The valve resting mechanism of this cylinder control type engine is provided for each cylinder so that it may act independently for each cylinder, and the engagement/disengagement of the
first rocker arm 9 and thesecond rocker arm 10 of each cylinder are individually controlled according to the running state of the engine. - In the
electromagnetic drive device 1, as shown in FIG. 2, thebracket 31 is fixed on a holdingmember 16 over thecylinder head 4 by means ofbolts 36. On thebracket 31, there is fixed by asupport bed 43 thecase 30 which is fixed on thebracket 31 by means of a knock-pin 48. Acover 37 is attached to thecase 30. in thiscase 30, there is fixed by means of a knock-pin 49 thelower yoke 34 of the electromagnet, which constructs thestator 15. On thelower yoke 34, there is fixed the annularupper yoke 32. In the annular portion defined by theupper yoke 32 and thelower yoke 34, there is arranged theexciting coil 33 which is arranged in an annular shape. In thehollow portion 50 of thestator 15, there is slidably arranged theplunger 53 which constructs themovable element 14. - The
lower end face 51 of thepush portion 40 of theplunger 53 forms the sliding face to come into sliding abutment against thepin 11. On the other hand, theclearance 35 is formed between the lower end face of thecylindrical plunger 41 and the upper end face of thelower yoke 34 so that it defines the stroke of the sliding motion of themovable element 14. As shown in FIG. 2, the lefthandmovable element 14 is in the state where it is lifted by theexciting coil 33 energized, but the righthandmovable element 14 is in the state where it is not lifted because theexciting coil 33 is deenergized. Thebracket 31 has anoil filler port 42 for feeding a lubricant so that themovable element 14 may slide smoothly. - On the other hand, this valve resting mechanism of the cylinder control type engine could be constructed such that a permanent magnet is disposed midway of the
upper yoke 32, i.e., the magnetic core for forming the magnetic path, although not shown, so that themovable element 14 may be self-restrained by the permanent magnet. In this modification, it is possible to reduce the power consumption at the time when the electromagnet is energized. - With the construction thus far described, this valve resting mechanism of the cylinder control type engine acts in the following manners.
- At the time of the engine at a high speed and under a high load, as shown in FIG. 4, the electromagnet of the
electromagnetic drive device 1 is excited. When the electromagnet of theelectromagnetic drive device 1 is excited, thecylindrical plunger 41 of themovable element 14 is attached by the magnetic pole, i.e., the upper end of thecylindrical portion 34 b of thelower yoke 34 so that themovable element 14 is lifted to push down thepin 11. At this time, thepin 11 slides down in thepin guide hole 13 formed in thefirst rocker arm 9 and comes into engagement with theengagement hole 12 of thesecond rocker arm 10. - When the
pin 11 engages at its leading end portion with theengagement hole 12 of thesecond rocker arm 10, thefirst rocker arm 9 and thesecond rocker arm 10 come into the integrally connected state. When thefirst rocker arm 9 and thesecond rocker arm 10 are thus fixed, not only thefirst rocker arm 9 but also thesecond rocker arm 10 is rocked by thecam 6, as shown in FIG. 5, so that the intake/exhaust valve 2 is pushed down through thevalve adjusting screw 28 fixed in thesecond rocker arm 10, to open the intake/exhaust port 5. - At an idling time or at a running time at a low speed/under a low load of the engine, on the other hand, the electromagnet of the
electromagnetic drive device 1 of the selected cylinder is unexcited to the inactive state. When the electromagnet of theelectromagnetic drive device 1 is thus unexcited, thepin 11 is returned upward by thereturn spring 22, as shown in FIG. 6, so that themovable element 14 of theelectromagnetic drive device 1 is returned upward by the return of thepin 11. - The leading end portion of the
pin 11 is retracted from theengagement hole 12 of thesecond rocker arm 10 by the return of thepin 11 to disconnect thefirst rocker arm 9 and thesecond rocker arm 10. When these first andsecond rocker arms second rocker arm 10 is not rocked even if thefirst rocker arm 9 is rocked by thecam 6, as shown in FIG. 7, so that it is held at the original position by thereturn spring 24. As a result, thevalve adjusting screw 28 fixed in thesecond rocker arm 10 does not push down the intake/exhaust valve 2 so that the intake/exhaust port 5 is held in the closed state.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000138018A JP3876589B2 (en) | 2000-05-11 | 2000-05-11 | Valve deactivation mechanism for cylinder-controlled engines |
JP2000-138018 | 2000-05-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010039930A1 true US20010039930A1 (en) | 2001-11-15 |
US6412461B2 US6412461B2 (en) | 2002-07-02 |
Family
ID=18645694
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/778,912 Expired - Fee Related US6412461B2 (en) | 2000-05-11 | 2001-02-08 | Valve resting mechanism for cylinder control type engine |
Country Status (4)
Country | Link |
---|---|
US (1) | US6412461B2 (en) |
EP (1) | EP1154129B1 (en) |
JP (1) | JP3876589B2 (en) |
DE (1) | DE60119832T2 (en) |
Cited By (5)
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US20170241300A1 (en) * | 2014-08-18 | 2017-08-24 | Eaton Corporation | Valvetrain with rocker arm housing magnetically actuated latch |
CN109653904A (en) * | 2018-12-07 | 2019-04-19 | 哈尔滨工程大学 | Carburetor engine energy conservation enriching device |
US10371016B2 (en) * | 2015-06-04 | 2019-08-06 | Eaton Intelligent Power Limited | Electrically latching rocker arm assembly having built-in OBD functionality |
US10781726B2 (en) * | 2015-06-04 | 2020-09-22 | Eaton Intelligent Power Limited | Electrically latching rocker arm assembly having built-in OBD functionality |
CN113550805A (en) * | 2021-06-30 | 2021-10-26 | 南京理工大学 | Electromagnetic driving valve actuating mechanism applied to automobile engine |
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US6463897B2 (en) * | 2000-05-16 | 2002-10-15 | Delphi Technologies, Inc. | Mechanical assist actuation bracket for deactivation and two-step roller finger followers |
KR20020095384A (en) * | 2001-06-14 | 2002-12-26 | 현대자동차주식회사 | Stoppage device for an internal combustion and method for the same |
US6644265B2 (en) * | 2002-04-09 | 2003-11-11 | Eaton Corporation | Electro-hydraulic manifold assembly and method of making same for controlling de-activation of combustion chamber valves in a multicylinder engine |
US7308962B2 (en) | 2003-02-26 | 2007-12-18 | Honda Motor Co., Ltd. | Control system for cylinder cut-off internal combustion engine |
US8011747B2 (en) | 2004-05-27 | 2011-09-06 | Silverbrook Research Pty Ltd | Printer controller for controlling a printhead with horizontally grouped firing order |
KR100633926B1 (en) * | 2004-07-05 | 2006-10-16 | 현대자동차주식회사 | Valve de-activation apparatus of vehicle engine |
CN102356216B (en) | 2009-05-11 | 2013-11-06 | 丰田自动车株式会社 | Valve stopping device for internal combustion engine |
JP5257290B2 (en) * | 2009-08-06 | 2013-08-07 | トヨタ自動車株式会社 | Variable valve controller |
FR2971012A1 (en) | 2010-12-22 | 2012-08-03 | Valeo Sys Controle Moteur Sas | DEBRAYABLE ROCKER FOR VALVE DISCONNECTION. |
FR2976617B1 (en) * | 2011-06-15 | 2015-06-19 | Valeo Sys Controle Moteur Sas | CONTROL OF AN INTERNAL COMBUSTION ENGINE |
FR2976972B1 (en) * | 2011-06-24 | 2015-04-03 | Valeo Sys Controle Moteur Sas | ACTUATION SYSTEM THREE STATES OF AT LEAST ONE VALVE OF A COMBUSTION ENGINE |
FR2990482B1 (en) * | 2012-05-14 | 2015-01-09 | Valeo Sys Controle Moteur Sas | LOCKING DEVICE FOR A SYSTEM FOR TRANSMITTING THE MOVEMENT OF AT LEAST ONE CAME HAVING AT LEAST ONE VALVE |
FR2990484B1 (en) * | 2012-05-14 | 2015-01-09 | Valeo Sys Controle Moteur Sas | LOCKING DEVICE FOR A SYSTEM FOR TRANSMITTING THE MOVEMENT OF AT LEAST ONE CAME HAVING AT LEAST ONE VALVE |
FR2990483B1 (en) * | 2012-05-14 | 2015-01-09 | Valeo Sys Controle Moteur Sas | LOCKING DEVICE FOR A SYSTEM FOR TRANSMITTING THE MOVEMENT OF AT LEAST ONE CAME HAVING AT LEAST ONE VALVE |
FR2990464B1 (en) * | 2012-05-14 | 2016-01-22 | Valeo Sys Controle Moteur Sas | ACTUATOR MOUNTING PLATE FOR A VALVE DISCONNECTING SYSTEM |
FR2990465B1 (en) * | 2012-05-14 | 2016-01-15 | Valeo Sys Controle Moteur Sas | MULTIPLE VALVE LIFTING ASSEMBLY |
FR2995935B1 (en) * | 2012-09-25 | 2015-07-31 | Valeo Sys Controle Moteur Sas | TRANSMISSION ASSEMBLY FOR MOVING AT LEAST ONE CAM |
US8763572B1 (en) * | 2012-12-11 | 2014-07-01 | Anthony Dike | Mechanical variable timing device that adjusts the pivot point at which a rocker arm pivots |
EP4028649A1 (en) | 2019-09-10 | 2022-07-20 | Eaton Intelligent Power Limited | Valvetrain with rocker shaft housing magnetic latch |
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US4204512A (en) * | 1978-03-27 | 1980-05-27 | Brock Horace T Jr | Cylinder deactivator system |
US4556025A (en) * | 1983-11-18 | 1985-12-03 | Mazda Motor Corporation | Engine valve mechanism having valve disabling device |
US4607600A (en) * | 1984-12-25 | 1986-08-26 | Toyota Jidosha Kabushiki Kaisha | Valve actuating apparatus in internal combustion engine |
JP2503935B2 (en) | 1994-03-28 | 1996-06-05 | 三菱自動車工業株式会社 | Engine valve train |
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US6092497A (en) * | 1997-10-30 | 2000-07-25 | Eaton Corporation | Electromechanical latching rocker arm valve deactivator |
GB2348246B (en) * | 1999-03-25 | 2002-11-13 | Ricardo Inc | Automotive valve rocker arms |
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2000
- 2000-05-11 JP JP2000138018A patent/JP3876589B2/en not_active Expired - Fee Related
-
2001
- 2001-02-08 US US09/778,912 patent/US6412461B2/en not_active Expired - Fee Related
- 2001-03-08 EP EP01105755A patent/EP1154129B1/en not_active Expired - Lifetime
- 2001-03-08 DE DE60119832T patent/DE60119832T2/en not_active Expired - Fee Related
Cited By (7)
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US20170241300A1 (en) * | 2014-08-18 | 2017-08-24 | Eaton Corporation | Valvetrain with rocker arm housing magnetically actuated latch |
US10180089B2 (en) * | 2014-08-18 | 2019-01-15 | Eaton Intelligent Power Limited | Valvetrain with rocker arm housing magnetically actuated latch |
US10371016B2 (en) * | 2015-06-04 | 2019-08-06 | Eaton Intelligent Power Limited | Electrically latching rocker arm assembly having built-in OBD functionality |
US10781726B2 (en) * | 2015-06-04 | 2020-09-22 | Eaton Intelligent Power Limited | Electrically latching rocker arm assembly having built-in OBD functionality |
CN113565596A (en) * | 2015-06-04 | 2021-10-29 | 伊顿公司 | Electrical latch rocker arm assembly with built-in OBD function |
CN109653904A (en) * | 2018-12-07 | 2019-04-19 | 哈尔滨工程大学 | Carburetor engine energy conservation enriching device |
CN113550805A (en) * | 2021-06-30 | 2021-10-26 | 南京理工大学 | Electromagnetic driving valve actuating mechanism applied to automobile engine |
Also Published As
Publication number | Publication date |
---|---|
EP1154129B1 (en) | 2006-05-24 |
EP1154129A1 (en) | 2001-11-14 |
DE60119832T2 (en) | 2006-11-23 |
JP2001317318A (en) | 2001-11-16 |
JP3876589B2 (en) | 2007-01-31 |
DE60119832D1 (en) | 2006-06-29 |
US6412461B2 (en) | 2002-07-02 |
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