WO2014030226A1 - 内燃機関の可変動弁装置 - Google Patents
内燃機関の可変動弁装置 Download PDFInfo
- Publication number
- WO2014030226A1 WO2014030226A1 PCT/JP2012/071186 JP2012071186W WO2014030226A1 WO 2014030226 A1 WO2014030226 A1 WO 2014030226A1 JP 2012071186 W JP2012071186 W JP 2012071186W WO 2014030226 A1 WO2014030226 A1 WO 2014030226A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cam
- state
- cam lobe
- internal combustion
- combustion engine
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
-
- 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
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
-
- 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
- F01L1/34413—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 composite camshafts, e.g. with cams being able to move relative to the camshaft
-
- 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
-
- 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
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0057—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by splittable or deformable cams
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- 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
- F01L2820/035—Centrifugal forces
Definitions
- the present invention relates to a variable valve operating apparatus for an internal combustion engine.
- Patent Document 1 discloses a variable valve operating apparatus for an internal combustion engine that includes a camshaft and a cam piece through which the camshaft penetrates.
- the hole of the cam piece through which the cam shaft passes is set to a size that allows the cam piece to move in the radial direction with respect to the cam shaft. For this reason, the cross-sectional area of the cam piece in the axial direction becomes small, and there is a possibility that the strength cannot be secured. Further, since the camshaft penetrates the cam piece, it needs to be made somewhat thin. Further, a pin and its biasing member are provided in the camshaft. For this reason, there is a possibility that the strength of the camshaft itself cannot be ensured.
- an object is to provide a variable valve operating apparatus for an internal combustion engine that ensures strength.
- the object is to provide a cam base portion that is provided integrally with the camshaft or is provided separately from the camshaft and is immovably fixed to the camshaft, and a first state and a first state at a position protruding from the outer periphery of the base portion.
- a cam lobe portion connected to the cam base portion so as to oscillate between the second states at lower positions, a lock mechanism for locking the cam lobe portion in the first and second states, and the lock And an urging member that urges the cam lobe portion to the first state to such an extent that the cam lobe portion moves to the second state by a reaction force from the cam follower when the mechanism is unlocked. This can be achieved by the variable valve system of the engine.
- the lock mechanism includes a lock member that is held in a holding hole of the cam lobe portion that extends in the axial direction of the cam shaft, and a first lock that is formed in the cam base portion and in which the lock member is aligned in the axial direction in the first state.
- a hole is formed in the cam base, and the lock member is urged to be inserted into the first lock hole in the second state, and the lock member is inserted in the first lock hole in the first state.
- a first path for applying hydraulic pressure so as to separate from the hole is formed in the cam base portion, and the hydraulic pressure is applied so that the lock member is inserted into the second lock hole in the second state.
- the second path for may include.
- the second path may include an outlet that is at a position retracted from the cam lobe portion in the first state and discharges oil to the outside of the cam base portion.
- a hydraulic control valve that adjusts the hydraulic pressure supplied to the first and second paths and a control unit that learns the hydraulic pressure when the first state is switched to the second state may be provided.
- the control unit may execute control for learning the oil pressure while the internal combustion engine is cutting fuel.
- the cam base portion may include a holding portion that holds oil that contacts the cam lobe portion in the second state.
- the cam lobe portion may include a base end portion that is connected to the cam base portion so as to swing, and a free end portion that is separated from the base end portion in a direction opposite to the rotation direction of the camshaft.
- the biasing member may be located in the axial direction of the camshaft with respect to the cam lobe portion.
- the cam lobe portion may include first and second cam lobe portions arranged in the axial direction of the cam shaft, and the cam base portion may support the first and second cam lobe portions.
- FIG. 1 is an external view of the variable valve operating apparatus of the present embodiment.
- FIG. 2 is an external view of the variable valve operating apparatus of the present embodiment.
- 3A and 3B are sectional views of the cam unit as seen from the axial direction.
- 4A and 4B are cross-sectional views showing the internal structure of the cam unit.
- 5A to 5C are explanatory views of the lock of the cam lobe portion.
- 6A and 6B are explanatory diagrams of the lock of the cam lobe portion.
- FIG. 7 is a flowchart illustrating an example of learning control of the oil control valve executed by the ECU.
- 8A is a partially enlarged view of FIG. 3B
- FIG. 8B is an explanatory view of a hollow portion
- FIG. 8C is an explanatory view of an absorbing member.
- FIG. 9 is a partially enlarged view of FIG. 4A.
- variable valve operating apparatus 1 is employed in an internal combustion engine mounted on a vehicle or the like.
- the variable valve operating apparatus 1 includes a camshaft S and a cam unit CU provided on the camshaft S.
- the camshaft S includes a portion SA connected to one end of the cam unit CU and a portion SB connected to the other end of the cam unit CU.
- the camshaft S is rotated by power from the internal combustion engine.
- the valve V is lifted via the rocker arm R.
- the valve V is an intake valve or an exhaust valve of the internal combustion engine.
- the cam unit CU includes a cam base portion 10 having a diameter larger than that of the cam shaft S and connected to the portions SA and SB of the cam shaft S, and two cam lobe portions 20 connected to the cam base portion 10.
- the cam base portion 10 has a substantially cylindrical shape, and has a substantially circular base circle portion 11 when viewed from the axial direction of the camshaft S (hereinafter referred to as the axial direction).
- the base circle portion 11 corresponds to the outer peripheral surface of the cam base portion 10.
- the two cam lobes 20 are arranged at a predetermined interval in the axial direction.
- the two cam lobes 20 push the two rocker arms R and lift the two valves V, respectively.
- the axial thickness of the cam base portion 10 is thicker than the axial thickness of the cam lobe portion 20.
- the cam base portion 10 has a recess 10 ⁇ / b> H formed between two cam lobe portions 20.
- the recess 10 ⁇ / b> H is formed between portions where the two rocker arms R contact the cam base portion 10.
- the recess 10H does not contact the rocker arm R.
- the support shaft 33 penetrates the cam base 10 and the two cam lobes 20 in the axial direction.
- the cam lobe portion 20 swings with respect to the cam base portion 10 with the support shaft 33 as a fulcrum. A part of the support shaft 33 is exposed in the recess 10H.
- Each of the two cam lobes 20 is provided with a stopper pin 34P.
- two springs 34S are wound around the support shaft 33.
- One end of the spring 34S pushes the inner surface of the recess 10H, and the other end of the spring 34S pushes the stopper pin 34P. That is, the spring 34S biases the stopper pin 34P so that it is separated from the recess 10H.
- the spring 34S is an example of an urging member.
- the left cam lobe portion 20 is in a lifted state protruding from the base circle portion 11 of the cam base portion 10, and the right cam lobe portion 20 is in a lift stop state where it does not protrude from the base circle portion 11 of the cam base portion 10. is there.
- the cam lobe 20 drives the rocker arm R to lift the valve V.
- the lift stop state the cam lobe 20 contacts or does not contact the rocker arm R and the valve V does not lift.
- the lift state is an example of a first state
- the lift stop state is an example of a second state.
- FIGS. 1 and 2 only one cam lobe portion 20 is in a lifted state for easy understanding, but actually, the two cam lobe portions 20 are in the same state as will be described later.
- 3A and 3B are sectional views of the cam unit CU as seen from the axial direction.
- 3A shows the cam lobe 20 in the lifted state
- FIG. 3B shows the cam lobe 20 in the lift stopped state.
- the cam lobe portion 20 has a substantially U shape or a substantially L shape that avoids the supply path T of the cam base portion 10.
- a support shaft 33 passes through the base end side of the cam lobe portion 20.
- the camshaft S rotates in the clockwise direction.
- the cam base 10 and the cam lobe 20 also rotate clockwise.
- a long hole 14 through which the stopper pin 34P passes is formed in the cam base portion 10. The long hole 14 regulates the movement range of the stopper pin 34 ⁇ / b> P that moves along with the rocking of the cam lobe 20, thereby restricting the rocking range of the cam lobe 20.
- 4A and 4B are cross-sectional views showing the internal structure of the cam unit CU.
- the two cam lobes 20 are both in a lifted state.
- 4A and 4B correspond to the AA cross-sectional view of FIG. 3A.
- the cam unit CU is formed symmetrically in the axial direction at the center of the cam unit CU in the axial direction. Therefore, in the following description, one of the two cam lobes 20 will be described.
- the cam base portion 10 is formed with a slit 12 that can accommodate the cam lobe portion 20.
- a supply path T extending on the axis of the camshaft S and paths T5 and T6 extending radially outward from the supply path T are formed.
- the paths T5 and T6 each extend radially outward from the supply path T, and then extend in the axial direction to the two cam lobe portions.
- the route T6 is an example of a first route.
- the route T5 is an example of a second route.
- the oil control valve CV is an electromagnetically driven flow control valve and is controlled by the ECU 5.
- the ECU 5 is an example of a control unit.
- the oil stored in the oil pan is supplied into the supply path T by the oil pump P.
- the oil pump P is a mechanical type interlocked with the crankshaft of the internal combustion engine.
- the oil control valve CV can linearly adjust the hydraulic pressure supplied into the supply path T by the oil pump P based on the current value applied to the oil control valve CV.
- the oil control valve CV is an example of a hydraulic control valve.
- the hydraulic control valve may be capable of adjusting the hydraulic pressure supplied into the supply path T in stages.
- the ECU 5 includes a CPU, a ROM, a RAM, and the like, and controls the operation of the entire internal combustion engine.
- the ROM stores a program for executing control described later.
- the cam base portion 10 holds pins 15P, 16P, and 17P that act on the two cam lobe portions 20, respectively.
- Each of the two cam lobes 20 holds a pin 26P.
- the pin 26P is an example of a lock member.
- FIG. 4B is a diagram in which the pins 15P and the like are omitted.
- the cam lobe portion 20 has a free end portion away from the base end portion through which the support shaft 33 passes, and a hole 26 holding a pin 26P is formed on the free end portion side of the cam lobe portion 20.
- the hole 26 penetrates the cam lobe 20 in the axial direction.
- the hole 26 is an example of a holding hole.
- holes 15 and 16 communicating with the slit 12 are formed.
- the holes 15 and 16 are formed on the same side with respect to the slit 12.
- the holes 15 and 16 extend in the axial direction and have a bottom surface.
- Pins 15P and 16P are accommodated in the holes 15 and 16, respectively.
- a spring 15S connected to the pin 15P is arranged between the bottom surface of the hole 15 and the pin 15P.
- a spring 16S connected to the pin 16P is disposed between the bottom surface of the hole 16 and the pin 16P.
- the spring 16S biases the pin 16P toward the cam lobe portion 20.
- the spring 15S is set to such a length that the pin 15P does not detach from the hole 15.
- the spring 15S is an example of a second spring.
- the spring 16S is an example of a first spring.
- a hole 17 is formed in the cam base portion 10 so as to face the hole 16 through the slit 12.
- a pin 17P is accommodated in the hole 17.
- the hole 17 communicates with the path T6.
- the hole 17 is located coaxially with the hole 16.
- the hole 17 extends in the axial direction.
- the holes 16, 17, and 26 are aligned in the axial direction, and the pins 16P, 17P, and 26P are aligned in the axial direction.
- the swing range of the cam lobe portion 20 is defined by the long hole 14 engaged with the stopper pin 34P so that the cam lobe portion 20 is positioned at such a position at one end of the swing range.
- the pin 16P is inserted into the holes 16 and 26 in common by the biasing force of the spring 16S, and the pin 26P is inserted into the holes 26 and 17 in common.
- the hole 17 is an example of a first lock hole.
- FIG. 5A to 6B are explanatory diagrams of the lock of the cam lobe portion 20.
- FIG. When oil is supplied into the paths T5 and T6 via the supply path T by the oil control valve CV and the oil pump P, the pin 17P resists the urging force of the spring 16S as shown in FIG. Pushed to the side. Thereby, the pin 16P is detached from the hole 26, and the pin 26P is detached from the hole 17. That is, the pins 16P, 17P, and 26P are accommodated in the holes 16, 17, and 26, respectively. Thereby, the lock
- the cam lobe 20 receives a reaction force from the rocker arm R when the camshaft S rotates with the cam lobe 20 unlocked. Accordingly, as shown in FIG. 5B, the cam lobe portion 20 moves to a position where it does not protrude from the cam base portion 10 against the urging force of the spring 34S. Thereby, the cam lobe part 20 will be in a lift stop state.
- the biasing force of the spring 34S is set to such an extent that the cam lobe 20 is brought into the lift stop state by the reaction force from the rocker arm R in a state where the lock of the cam lobe 20 is released.
- the holes 15 and 26 are arranged coaxially.
- the swing range of the cam lobe portion 20 is defined by the long hole 14 engaged with the stopper pin 34P so that the cam lobe portion 20 is positioned at such a position at the other end of the swing range.
- the rocker arm R is an example of a cam follower for driving a bubble.
- the cam follower may be a valve lifter that is directly driven by the cam.
- the pin 26P is inserted in common into the holes 15 and 26 against the urging force of the spring 15S, as shown in FIG. 5C, due to the pressure of oil from the path T5. Thereby, the cam lobe part 20 is locked in a lift stop state. As described above, the cam lobe portion 20 is locked in the lift stop state while the oil is supplied into the supply path T at a pressure higher than a predetermined pressure.
- the hole 15 is an example of a second lock hole.
- the cam lobe 20 shifts from the lift stop state to the lift state.
- the cam lobe portion 20 shifts to the lifted state according to the biasing force of the spring 34S.
- the pins 16P, 26P, and 17P are arranged in the axial direction as described above.
- the pin 16P is inserted into the holes 16 and 26 in common according to the urging force of the spring 16S, and similarly the pin 26P is inserted into the holes 26 and 17 in common.
- the cam lobe part 20 in a lift state is locked.
- the cam lobe 20 is locked in the lift state and the lift stop state.
- the hole 26, the pin 26P, the springs 15S and 16S, the holes 15 and 17 and the like are examples of a lock mechanism.
- the cam base portion 10 is connected to the cam shaft S, and the cam shaft S does not penetrate the cam base portion 10. For this reason, the axial cross-sectional area of the cam base part 10 can be ensured, and the strength of the cam base part 10 can be ensured. Since the camshaft S does not penetrate the cam base portion 10, it is not necessary to reduce the diameter of the camshaft S. For this reason, the strength of the camshaft S is also ensured.
- the holes 15, 16, and 17 formed in the cam base portion 10, the holes 26 formed in the cam lobe portion 20, and the like all extend in the axial direction.
- the cross-sectional area in the axial direction of the cam base portion 10 can be secured. . Thereby, the strength of the cam unit CU is ensured.
- the free end of the cam lobe portion 20 is separated from the base end side of the cam lobe portion 20 in the reverse direction from the rotation direction of the camshaft S.
- the base end side of the cam lobe portion 20 serves as a fulcrum for swinging by the support shaft 33. For this reason, it becomes easy for the cam lobe portion 20 to swing in the direction opposite to the rotation direction of the camshaft S due to the reaction force of the rocker arm R. This facilitates the transition of the cam lobe 20 from the lift state to the lift stop state in the unlocked state. Further, the reaction force from the rocker arm R received by the cam lobe 20 when shifting to the lift stop state is reduced, and the durability of the cam lobe 20 is ensured.
- the cam base portion 10 supports two cam lobe portions 20. For this reason, since the cam base part 10 has secured the length of the axial direction, the intensity
- the springs 15S, 16S, and 34S are arranged in the axial direction with respect to the cam lobe portion 20.
- the cross-sectional area in the axial direction of the cam lobe part 20 is securable. Thereby, the strength of the cam lobe portion 20 can be ensured.
- the recess 10H in which the spring S34 is disposed is provided in a portion that does not contact the rocker arm R, and thus this portion is effectively used. Since the spring S34 is disposed at a position retracted from the portion of the cam base portion 10 that contacts the rocker arm R, the cross-sectional area in the axial direction of the portion of the cam base portion 10 that contacts the rocker arm R is also secured. Thereby, the strength of the cam base portion 10 is also ensured.
- the exit of the path T5 is formed so as to open to the slit 12, and this exit is formed at a position away from the cam lobe portion 20 in the lifted state.
- the oil in the lift state, by supplying oil to the supply path T, the oil can be supplied from the outlet of the path T5 to the rocker arm R and the like via the slit 12.
- lubrication of the rocker arm R and the cam unit CU can be ensured. Even if the conventional cam shower mechanism is eliminated, lubrication can be promoted by the variable valve operating apparatus 1 of the present embodiment.
- FIG. 7 is a flowchart showing an example of learning control of the oil control valve CV executed by the ECU 5.
- the ECU 5 determines whether or not the internal combustion engine is cutting fuel (step S1). If the determination is negative, this control is terminated. If the determination is affirmative, the ECU 5 increases the current value of the oil control valve CV and starts supplying oil into the supply path T (step S2). Specifically, the duty ratio for applying the current applied to the oil control valve CV is gradually increased. Thereby, the current value applied to the oil control valve CV is gradually increased.
- the oil control valve CV can increase the oil pressure in the supply path T in accordance with the applied current value.
- the ECU 5 determines whether or not the cam lobe 20 has been switched from the lift state to the lift stop state due to the rise of oil into the supply path T (step S3). Specifically, the ECU 5 performs the above determination based on a change in the intake air amount calculated based on the output value of the air flow meter. In the lift state, intake air is introduced into the combustion chamber of the internal combustion engine. On the other hand, since the valve V does not lift in the lift stop state, the intake air amount is reduced without introducing the intake air into the combustion chamber. This decrease in the intake air amount can be detected by the output from the air flow meter, and the ECU 5 can determine that the cam lobe 20 has been switched from the lift state to the lift stop state.
- the ECU 5 learns the current value applied to the oil control valve CV when the cam lobe 20 is switched from the lift state to the lift stop state (step S4). Specifically, the ECU 5 records this current value in the RAM.
- the current value applied to the oil control valve CV corresponds to the oil pressure in the supply path T, paths T5 and T6. For this reason, by learning the current value when the cam lobe 20 is switched from the lift state to the lift stop state, it is possible to learn the oil pressure when the cam lobe unit 20 is switched from the lift state to the lift stop state.
- the ECU 5 ends the learning control. The reason why the learning control is executed during the fuel cut in this manner is that even if the lift of the valve V is stopped during the fuel cut, the operation state is not greatly affected.
- FIG. 8A is a partially enlarged view of FIG. 3B.
- a recess 15R is formed at the position of the cam base 10 that faces the free end of the cam lobe 20 in the lift stop state.
- the recess 15R is formed near the exit of the path T5.
- the recess 15R holds a part of the oil that has flowed out of the cam base 10 from the exit of the path T5.
- the hollow portion 15R is an example of a holding portion.
- the recess 15R has a shape that is recessed to hold oil.
- the rotation direction of the cam unit CU is clockwise.
- the bottom surface of the recess 15R is formed to face the rotation direction of the cam unit CU. For this reason, the oil is held in the recess 15R by the inertial force generated by the rotation of the cam unit CU.
- the absorbing member 15Ra is a sponge that can absorb and hold oil. In this way, the cam lobe portion 20 can be buffered using oil.
- the absorbing member 15Ra is an example of a holding unit.
- FIG. 9 is a partially enlarged view of FIG. 4A.
- the path T ⁇ b> 6 includes a storage portion T ⁇ b> 7 formed at a position away from the rotational axis 10 ⁇ / b> A of the cam base portion 10 radially outward.
- the storage unit T7 is an example of a storage chamber.
- the reservoir T7 extends in the same axial direction as the hole 17 in which the pin 17P is accommodated. For example, when the oil is stopped after being supplied into the supply path T, the oil is held in the storage portion T7 by the centrifugal force generated by the rotation of the cam base portion 10.
- the oil held in the reservoir T7 can be reused. Therefore, the supply amount of oil supplied into the supply path T in order to switch the cam lobe part 20 from the lift state to the lift stop state can be reduced. Further, as the rotational speed of the internal combustion engine increases, the centrifugal force acting on the oil stored in the storage portion T7 also increases. For this reason, the higher the rotational speed of the internal combustion engine, the more the cam lobe 20 can be switched from the lifted state to the lift stopped state even if the oil pressure is smaller.
- the ECU 5 may store the learned current value in association with the rotational speed of the internal combustion engine when the current value is learned.
- the oil can be used for lubrication while maintaining the lift state at the rotational speed.
- the cam lobe portion 20 has a first state in which the cam base portion 10 protrudes from the base circle portion 11 and a second state in which the protrusion amount is smaller than the first state but protrudes from the base circle portion 11. You may rock
- the oil pressure may be applied directly to the pin 26P without using the pin 17P. Further, the springs 15S and 16S may directly bias the pin 26P without using the pins 15P and 16P.
- two cam lobes 20 are connected to one cam base 10, but the present invention is not limited to this.
- two cam lobes 20 may be connected to two cam bases, respectively.
- the cam base portion 10 may be molded integrally with the cam shaft, or may be joined after being molded separately as in this embodiment.
- Variable valve gear 5 ECU (control unit) S Camshaft CV Oil control valve 10 Cam base part 20 Cam lobe part 26 Pin (locking member) 34S Spring (Biasing member) 15S spring (second spring) 16S spring (first spring) 17 holes (first lock hole) 15 holes (second lock hole) T6 route (first route) T5 route (second route)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
5 ECU(制御部)
S カムシャフト
CV オイルコントロールバルブ
10 カムベース部
20 カムロブ部
26 ピン(ロック部材)
34S スプリング(付勢部材)
15S スプリング(第2スプリング)
16S スプリング(第1スプリング)
17 孔(第1ロック孔)
15 孔(第2ロック孔)
T6 経路(第1経路)
T5 経路(第2経路)
Claims (9)
- カムシャフトに一体に設けられ又は別体に設けられ前記カムシャフトに移動不能に固定されたカムベース部と、
前記ベース部の外周から突出した位置にある第1状態と前記第1状態よりも低い位置にある第2状態間を揺動して移行するように前記カムベース部に連結されたカムロブ部と、
前記第1及び第2状態で前記カムロブ部をロックするロック機構と、
前記ロック機構がロックを解除している場合にカムフォロアからの反力により前記カムロブ部が前記第2状態へ移行する程度に前記カムロブ部を前記第1状態へ付勢する付勢部材と、
を備えた内燃機関の可変動弁装置。 - 前記ロック機構は、
前記カムシャフトの軸方向に延びた前記カムロブ部の保持孔に保持されたロック部材、
前記カムベース部に形成され前記第1状態で前記ロック部材が前記軸方向に並ぶ第1ロック孔、
前記カムベース部に形成され前記第2状態で前記ロック部材が前記軸方向に並ぶ第2ロック孔、
前記第1状態で前記ロック部材が前記第1ロック孔に挿入されるように付勢する第1スプリング、
前記第2状態で前記ロック部材が前記第2ロック孔から退避するように付勢する第2スプリング、
前記カムベース部に形成され、前記第1状態で前記ロック部材が前記第1ロック孔から離脱するように油圧を作用させる第1経路、
前記カムベース部に形成され、前記第2状態で前記ロック部材が前記第2ロック孔に挿入されるように油圧を作用させる第2経路、
を含む請求項1の内燃機関の可変動弁装置。 - 前記第2経路は、前記第1状態にある前記カムロブ部から退避した位置にあり前記カムベース部の外部に油を放出する出口を含む、請求項2の内燃機関の可変動弁装置。
- 前記第1及び第2経路内に供給する油圧を調整する油圧制御弁と、
前記第1状態から前記第2状態に切り替わるときの油圧を学習する制御部と、を備えた請求項2又は3の内燃機関の可変動弁装置。 - 前記制御部は、内燃機関が燃料カット中に前記油圧を学習する制御を実行する、請求項4の内燃機関の可変動弁装置。
- 前記カムベース部は、前記第2状態で前記カムロブ部に接触する油を保持する保持部を含む、請求項1乃至4の何れかの内燃機関の可変動弁装置。
- 前記カムロブ部は、前記カムベース部に揺動するように連結された基端部、前記基端部から前記カムシャフトの回転方向と逆方向に離れた自由端部、を含む、請求項1乃至6の何れかの内燃機関の可変動弁装置。
- 前記付勢部材は、前記カムロブ部に対して前記カムシャフトの軸方向に位置している、請求項1乃至7の何れかの内燃機関の可変動弁装置。
- 前記カムロブ部は、前記カムシャフトの軸方向に並んだ第1及び第2カムロブ部を含み、
前記カムベース部は、前記第1及び第2カムロブ部を支持している、請求項1乃至8の何れかの内燃機関の可変動弁装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/422,501 US9745875B2 (en) | 2012-08-22 | 2012-08-22 | Variable valve gear for internal combustion engine |
PCT/JP2012/071186 WO2014030226A1 (ja) | 2012-08-22 | 2012-08-22 | 内燃機関の可変動弁装置 |
CN201280075369.8A CN104583546B (zh) | 2012-08-22 | 2012-08-22 | 内燃机的可变气门装置 |
JP2014531423A JP5915754B2 (ja) | 2012-08-22 | 2012-08-22 | 内燃機関の可変動弁装置 |
EP12883416.5A EP2889458B1 (en) | 2012-08-22 | 2012-08-22 | Variable valve gear for internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/071186 WO2014030226A1 (ja) | 2012-08-22 | 2012-08-22 | 内燃機関の可変動弁装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014030226A1 true WO2014030226A1 (ja) | 2014-02-27 |
Family
ID=50149562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/071186 WO2014030226A1 (ja) | 2012-08-22 | 2012-08-22 | 内燃機関の可変動弁装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9745875B2 (ja) |
EP (1) | EP2889458B1 (ja) |
JP (1) | JP5915754B2 (ja) |
CN (1) | CN104583546B (ja) |
WO (1) | WO2014030226A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014098337A (ja) * | 2012-11-14 | 2014-05-29 | Toyota Motor Corp | 内燃機関の可変動弁装置 |
EP3045690A2 (en) | 2015-01-15 | 2016-07-20 | Toyota Jidosha Kabushiki Kaisha | Variable valve apparatus for internal combustion engine |
DE102016103233A1 (de) | 2015-03-19 | 2016-09-22 | Toyota Jidosha Kabushiki Kaisha | Variable Ventilvorrichtung für eine Verbrennungskraftmaschine |
JP2017008896A (ja) * | 2015-06-25 | 2017-01-12 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
JPWO2015111661A1 (ja) * | 2014-01-22 | 2017-03-23 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
CN110582619A (zh) * | 2017-03-09 | 2019-12-17 | 伊顿智能动力有限公司 | 用于致动可切换摇臂中的闩锁的致动装置和包括该致动装置的配气机构 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5991289B2 (ja) * | 2013-09-05 | 2016-09-14 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置及び内燃機関の可変動弁システム |
CN105240083B (zh) * | 2015-11-06 | 2017-10-31 | 杭州新坐标科技股份有限公司 | 一种两段式可变气门升程与气门二次开启机构 |
CN105240084B (zh) * | 2015-11-06 | 2017-10-27 | 杭州新坐标科技股份有限公司 | 可实现可变气门升程与二次开启的机构 |
CN105317498B (zh) * | 2015-11-27 | 2017-10-31 | 杭州新坐标科技股份有限公司 | 用于可变气门升程机构的凸轮滑块定位机构 |
DE102017214793A1 (de) * | 2017-08-24 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Ventiltrieb für eine Brennkraftmaschine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS608402U (ja) * | 1983-06-28 | 1985-01-21 | 三菱自動車工業株式会社 | プロフイ−ル可変型カム |
JPS61275515A (ja) * | 1985-05-30 | 1986-12-05 | Toshiaki Konishi | エンジンの可変カム機構 |
JPS62195608U (ja) * | 1986-06-03 | 1987-12-12 | ||
JPH06307216A (ja) * | 1993-04-20 | 1994-11-01 | Toyota Motor Corp | 内燃機関の動弁装置における高低速切換機構 |
JP2001329819A (ja) | 1999-10-29 | 2001-11-30 | Unisia Jecs Corp | 内燃機関のカム駆動制御装置 |
JP2002013404A (ja) * | 2000-06-30 | 2002-01-18 | Unisia Jecs Corp | 内燃機関のカム駆動制御装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2888837A (en) * | 1957-02-28 | 1959-06-02 | Carl S Hellmann | Adjustable cam mechanism |
DE2647332C3 (de) * | 1976-10-20 | 1979-10-04 | Augustin 8900 Augsburg Thalhofer | Nockengesteuerte Brennkraftmaschine |
US6427653B1 (en) | 1999-10-29 | 2002-08-06 | Unisia Jecs Corporation | System for driving and controlling CAM for internal combustion engine |
DE10038916B4 (de) * | 2000-08-09 | 2004-02-19 | Fev Motorentechnik Gmbh | Kolbenbrennkraftmaschine mit Gaswechselventilen, die zur Erzeugung einer zusätzlichen Bremsleistung steuerbar sind |
WO2004109068A1 (de) | 2003-06-02 | 2004-12-16 | Mahle Ventiltrieb Gmbh | Nockenwelle, insbesondere eines kraftfahrzeug-verbrennungsmotors, mit schaltbaren nocken |
GB2427897B (en) * | 2005-06-30 | 2010-05-05 | Jean Pierre Pirault | Improvements to variable valve timing mechanisms |
-
2012
- 2012-08-22 EP EP12883416.5A patent/EP2889458B1/en not_active Not-in-force
- 2012-08-22 US US14/422,501 patent/US9745875B2/en not_active Expired - Fee Related
- 2012-08-22 CN CN201280075369.8A patent/CN104583546B/zh not_active Expired - Fee Related
- 2012-08-22 WO PCT/JP2012/071186 patent/WO2014030226A1/ja active Application Filing
- 2012-08-22 JP JP2014531423A patent/JP5915754B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS608402U (ja) * | 1983-06-28 | 1985-01-21 | 三菱自動車工業株式会社 | プロフイ−ル可変型カム |
JPS61275515A (ja) * | 1985-05-30 | 1986-12-05 | Toshiaki Konishi | エンジンの可変カム機構 |
JPS62195608U (ja) * | 1986-06-03 | 1987-12-12 | ||
JPH06307216A (ja) * | 1993-04-20 | 1994-11-01 | Toyota Motor Corp | 内燃機関の動弁装置における高低速切換機構 |
JP2001329819A (ja) | 1999-10-29 | 2001-11-30 | Unisia Jecs Corp | 内燃機関のカム駆動制御装置 |
JP2002013404A (ja) * | 2000-06-30 | 2002-01-18 | Unisia Jecs Corp | 内燃機関のカム駆動制御装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2889458A4 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014098337A (ja) * | 2012-11-14 | 2014-05-29 | Toyota Motor Corp | 内燃機関の可変動弁装置 |
JPWO2015111661A1 (ja) * | 2014-01-22 | 2017-03-23 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
EP3045690A2 (en) | 2015-01-15 | 2016-07-20 | Toyota Jidosha Kabushiki Kaisha | Variable valve apparatus for internal combustion engine |
CN105804825A (zh) * | 2015-01-15 | 2016-07-27 | 丰田自动车株式会社 | 用于内燃发动机的可变气门装置 |
US10041382B2 (en) | 2015-01-15 | 2018-08-07 | Toyota Jidosha Kabushiki Kaisha | Variable valve apparatus for internal combustion engine |
DE102016103233A1 (de) | 2015-03-19 | 2016-09-22 | Toyota Jidosha Kabushiki Kaisha | Variable Ventilvorrichtung für eine Verbrennungskraftmaschine |
JP2016176395A (ja) * | 2015-03-19 | 2016-10-06 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
US9945268B2 (en) | 2015-03-19 | 2018-04-17 | Toyota Jidosha Kabushiki Kaisha | Variable valve apparatus for internal combustion engine |
DE102016103233B4 (de) | 2015-03-19 | 2022-06-23 | Toyota Jidosha Kabushiki Kaisha | Variable Ventilvorrichtung für eine Verbrennungskraftmaschine |
JP2017008896A (ja) * | 2015-06-25 | 2017-01-12 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
CN110582619A (zh) * | 2017-03-09 | 2019-12-17 | 伊顿智能动力有限公司 | 用于致动可切换摇臂中的闩锁的致动装置和包括该致动装置的配气机构 |
US11359523B2 (en) | 2017-03-09 | 2022-06-14 | Eaton Intelligent Power Limited | Actuation arrangement for actuating a latch in a switchable rocker arm and a valve train comprising the same |
Also Published As
Publication number | Publication date |
---|---|
US9745875B2 (en) | 2017-08-29 |
CN104583546A (zh) | 2015-04-29 |
JPWO2014030226A1 (ja) | 2016-07-28 |
JP5915754B2 (ja) | 2016-05-11 |
US20150184560A1 (en) | 2015-07-02 |
EP2889458A4 (en) | 2016-02-17 |
CN104583546B (zh) | 2017-03-08 |
EP2889458B1 (en) | 2017-04-12 |
EP2889458A1 (en) | 2015-07-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5915754B2 (ja) | 内燃機関の可変動弁装置 | |
JP5403341B2 (ja) | 弁開閉時期制御装置 | |
JP2007526423A (ja) | 切換え式フィンガ従動子アセンブリ | |
JP2009062978A (ja) | 回転子の権限範囲の一部のみを介して回転子を偏向させるよう予荷重を加えられたばねを有するカム位相制御器 | |
JP2009509081A (ja) | 切換え式フィンガ従動子アセンブリ | |
JP2009185784A (ja) | バルブタイミング調整装置 | |
WO2014130276A2 (en) | Using a camshaft timing device with hydraulic lock in an intermediate position for vehicle restarts | |
JP2009162111A (ja) | バルブタイミング調整装置 | |
JP2007040114A (ja) | 内燃機関用直動型バルブリフタ | |
JP2008095568A (ja) | 可変カム機構 | |
JP5962603B2 (ja) | 内燃機関の可変動弁装置 | |
JP2016145537A (ja) | デコンプ装置 | |
JP2014092128A (ja) | 内燃機関の可変動弁装置 | |
JP5920177B2 (ja) | 内燃機関の可変動弁装置 | |
JP5817706B2 (ja) | 内燃機関の可変動弁装置 | |
JP2014126000A (ja) | 内燃機関の可変動弁装置 | |
JP2008157129A (ja) | 可変動弁装置、それを備えたエンジン装置および車両 | |
JP2014152694A (ja) | 内燃機関の可変動弁装置 | |
JP5991289B2 (ja) | 内燃機関の可変動弁装置及び内燃機関の可変動弁システム | |
JP2014214671A (ja) | 内燃機関の可変動弁装置 | |
JP2008101611A (ja) | 内燃機関の可変動弁装置 | |
JP2015140752A (ja) | 内燃機関の可変動弁装置 | |
JP2014181645A (ja) | 内燃機関の制御装置 | |
KR20090064806A (ko) | 가변 밸브 시스템 | |
JP6107976B2 (ja) | 内燃機関の可変動弁装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12883416 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014531423 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14422501 Country of ref document: US |
|
REEP | Request for entry into the european phase |
Ref document number: 2012883416 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012883416 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |