KR102119446B1 - Mutiple variable valve lift appratus - Google Patents

Abstract

Multi-stage variable valve lift apparatus according to an embodiment of the present invention, the cam shaft rotating by the operation of the engine; At least two or more cam forming parts disposed on an outer circumferential surface of the cam shaft so as to rotate together with the cam shaft and move in the axial direction of the cam shaft; A valve opening/closing device operated by either the high cam or the low cam formed in the cam forming part; An operation unit disposed on an outer circumferential surface of the cam shaft to move together with any one of the two or more cam forming parts; A solenoid for selectively moving the operation unit along the axial direction of the cam shaft; Rotating with the cam shaft, and disposed movably in the axial direction of the cam shaft between any one of the cam forming portion and the other of the cam forming portion on the outer peripheral surface of the cam shaft, among the cam forming portion An interlocking unit which is axially moved in accordance with movement in the axial direction to move the other of the cam forming portions in the axial direction of the cam shaft; And a pin operation device for selectively moving the interlocking unit along the axial direction of the cam shaft.

Description

Multi-stage variable valve lift device {MUTIPLE VARIABLE VALVE LIFT APPRATUS}

The present invention relates to a multi-stage variable valve lift apparatus, and more particularly, to a multi-stage variable valve lift apparatus capable of reducing production cost.

In general, an internal combustion engine forms power by burning air and fuel received in a combustion chamber. Here, when inhaling air, intake valves are operated by driving a camshaft, and air is sucked into the combustion chamber while the intake valve is open. In addition, when discharging air, the exhaust valve is operated by driving the camshaft, and air is discharged from the combustion chamber while the exhaust valve is open.

On the other hand, the optimal intake valve or exhaust valve operation depends on the rotational speed of the engine. That is, an appropriate lift or valve opening/closing time is controlled according to the rotational speed of the engine. As described above, in order to implement an appropriate valve operation according to the rotational speed of the engine, a variable valve lift (VVL) device that implements the valve to operate with a different lift according to the rotational speed of the engine has been studied. . An example of such a variable valve lift device is a cam shaft having a plurality of cams for driving valves with different lifts, and a device operated to select a cam for driving a valve depending on the situation.

However, when a plurality of cams are provided in the cam shaft, the configuration for selectively changing the cam for operating the intake valve or the exhaust valve is complicated and interference between components may occur.

Meanwhile, the production cost can be increased by precision processing of components to prevent interference between components.

Accordingly, the present invention was created to solve the above problems, and an object of the present invention is to provide a multi-stage variable valve lift device that is simple in configuration and efficiently operates without interference between components.

In addition, there is another object to provide a multi-stage variable valve lift device that can reduce the production cost.

Multi-stage variable valve lift apparatus according to an embodiment of the present invention for achieving this object, the cam shaft rotating by the operation of the engine; At least two or more cam forming parts disposed on an outer circumferential surface of the cam shaft so as to rotate together with the cam shaft and move in the axial direction of the cam shaft; A valve opening/closing device operated by either the high cam or the low cam formed in the cam forming part; An operation unit disposed on an outer circumferential surface of the cam shaft to move together with any one of the two or more cam forming parts; A solenoid for selectively moving the operation unit along the axial direction of the cam shaft; Rotating with the cam shaft, and disposed movably in the axial direction of the cam shaft between any one of the cam forming portion and the other of the cam forming portion on the outer peripheral surface of the cam shaft, among the cam forming portion An interlocking unit which is axially moved in accordance with movement in the axial direction to move the other of the cam forming portions in the axial direction of the cam shaft; And a pin operation device for selectively moving the interlocking unit along the axial direction of the cam shaft.

The cam forming portion and the operation unit may be formed independently and combined.

The one cam forming portion, the interlocking unit, and the other cam forming portion may be operated to sequentially move along the axial direction of the cam shaft.

As the cam forming portion is moved in the axial direction of the cam shaft, the valve opening and closing device is operated by either the high cam or the low cam, so that the valve lift can be varied such that either the high lift or the low lift is selected. have.

The operation unit may be a cylindrical shape having a hollow into which the cam shaft is inserted.

A guide rail having a shape in which a groove extends along an outer circumference is formed in the operating unit, and the solenoid is provided with a connecting pin that selectively contacts the guide rail, and the cam is in a state where the connecting pin is in contact with the guide rail. As the shaft is rotated, the guide rail can guide the axial movement of the cam shaft of the operation unit.

The interlocking unit may be a cylindrical shape having a hollow into which the cam shaft is inserted.

The interlocking unit is formed with a guide rail having a groove extending along an outer circumference, and the pin actuating device is provided with a pin that selectively contacts the guide rail, and the cam is in a state where the pin is in contact with the guide rail. As the shaft rotates, the guide rail can guide the camshaft axial movement of the interlocking unit.

The pin is provided with two, the guide rail is the interlocking unit is moved in one direction along the axial direction of the cam shaft by one of the two pins, the cam shaft by the other of the two pins It may be formed to move in the other direction along the axial direction of.

The operation unit and the solenoid are each provided in two, the cam forming portion and the interlocking unit may be alternately disposed between the two operation units.

The interlocking unit disposed between two neighboring cam forming portions among the at least two cam forming portions is pushed by one of the two neighboring cam forming portions and pushes the other, while the at least two cam forming portions are pushed. It can be moved in stages.

A cam engaging hole to which the cam forming portion is coupled may be formed at one end of the operation unit, and a cam inserting portion having a shape corresponding to the cam engaging hole may be formed at the cam forming portion to be pressed into the cam engaging hole.

The multi-stage variable valve lift apparatus according to an embodiment of the present invention is disposed on an outer circumferential surface of the cam shaft to move together with any one of the two or more cam forming portions, and forms a locking jaw for limiting movement of the cam forming portion A locking jaw forming unit; And a stopper provided to limit the movement of the cam forming portion by engaging with the locking jaw.

The locking jaw forming portion and the operation unit may be formed independently and combined.

A locking jaw coupling hole is formed at the other end of the operation unit to which the locking jaw forming portion is coupled, and a locking jaw inserting portion having a shape corresponding to the locking jaw coupling hole to be pressed into the locking jaw coupling hole is formed in the locking jaw forming portion Can be formed.

The cam forming portion and the locking jaw forming portion may have a cylindrical shape in which the cam shaft is inserted, and the operation unit, the cam forming portion, and the locking jaw forming portion may be spline-coupled with the cam shaft.

Splines may be simultaneously processed on the inner circumferential surfaces of the operation unit, the cam forming portion, and the locking jaw forming portion after the cam insertion portion is pressed into the cam engaging hole and the engaging jaw insertion portion is pressed into the engaging jaw engaging hole. .

According to the embodiment of the present invention as described above, according to the operation of the pin operation device and the pin operation device, it is possible to have an efficient operation while having a simple configuration by the interlocking unit moving in the axial direction of the cam shaft.

In addition, the cam forming parts disposed in different cylinders are operated stepwise by the interlocking unit, so that interference between components can be prevented.

Further, the operation unit, the cam forming portion, and the engaging jaw forming portion are independently processed and combined, thereby reducing production cost.

1 is a block diagram of a multi-stage variable valve lift device according to an embodiment of the present invention.
2 is a configuration diagram of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention.
3 is an exploded cross-sectional view of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention.
4 is a cross-sectional view of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a multi-stage variable valve lift device according to an embodiment of the present invention.

1, the multi-stage variable valve lift device 1 according to an embodiment of the present invention includes a cam shaft 3, cam forming parts 40 and 60, a solenoid 10, and operation units 30 and 50. ), an interlocking unit 70, and a pin operating device 20.

The cam shaft 100 is a shaft that rotates according to the rotation of the crankshaft (not shown) of the engine. Since the cam shaft 100 is obvious to those skilled in the art (hereinafter, those skilled in the art), detailed descriptions thereof will be omitted.

The cam forming parts 40 and 60 are formed with cams 41, 42, 48, 49, 61, 62, 68 and 69 which operate an intake valve (not shown) or an exhaust valve (not shown) of the engine. As a part, it is formed in a hollow cylindrical shape having a constant thickness. In addition, the cam shaft 100 is inserted into the hollow of the cam forming portions 40 and 60. Accordingly, the overall shape of the cam forming portions 40 and 60 and the cam shaft 100 becomes a shape in which the cam forming portions 40 and 60 protrude from the outer circumferential surface of the cam shaft 100. Here, the hollow of the cam forming parts 40 and 60 may be a circular shape corresponding to the outer circumference of the cam shaft 100. That is, the inner circumferential surface of the cam forming portions 40 and 60 is in contact with the outer circumferential surface of the cam shaft 100. Furthermore, the cam forming portions 40 and 60 may be moved in the axial direction of the cam shaft 100 by sliding their inner circumferential surface on the outer circumferential surface of the cam shaft 100. Meanwhile, the cam forming parts 40 and 60 are provided to rotate together with the cam shaft 100. As described above, the cam forming portion 40, 60 is movable in the axial direction of the cam shaft 100, and the cam forming portion 40, 60 and the cam shaft 100 rotate together. 40, 60) and the cam shaft 10 may be configured according to the design of a person skilled in the art by a coupling method such as a spline.

The cam forming parts 40 and 60 include two cam forming parts 40 and 60 divided into a first cam forming part 40 and a second cam forming part 60. Here, the first cam forming portion 40 is provided to operate a valve (not shown) disposed in one cylinder, and the second cam forming portion 60 is a valve disposed in another cylinder ( (Not shown). Furthermore, the first cam forming part 40 can operate two valves disposed in one cylinder, and the second cam forming part 60 can operate two valves disposed in another cylinder. .

1, the multi-stage variable valve lift apparatus 1 for operating a valve in two cylinders is not limited thereto, and the multi-stage variable valve lift apparatus 1 according to an embodiment of the present invention includes at least two cylinders (not shown). In a multi-cylinder engine comprising a can be applied to operate the valve disposed in each cylinder. Here, the valve is the intake valve or the exhaust valve.

The first cam forming part 40 includes a first low cam 41, a first high cam 42, a second low cam 48, a second high cam 49, and a first connection part 45. Includes.

The first low cam (41), the first high cam (42), the second low cam (48), and the second high cam (49) have an outer circumferential surface of a cross section so that one end protrudes relatively more than the other end. It may be a general cam shape formed in an oval shape. Typically, one end of the cam is called a cam lobe and the other end is called a cam base.

The cam base is a base circle of the cam having an arc shape having a constant radius among the outer circumferences of the cam. In addition, the cam lobe of the valve 41, 42, 48, 49 of the outer periphery of the valve opening and closing device until the valve starts to open by the rotation of the cams (41, 42, 48, 49) and completely closed (5 ). Here, the valve opening/closing device 5 has one end in rolling contact with the cams 41, 42, 48, 49, and operates to open and close the valve by rotation of the cams 41, 42, 48, 49. It is a device. Since the valve opening and closing device 5 is obvious to those skilled in the art, further detailed description will be omitted.

The first low cam 41 and the first high cam 42 are formed adjacent, and the second low cam 48 and the second high cam 49 are formed adjacent. In addition, the first low cam 41 and the first high cam 42 are integrally formed to operate one valve, and the second low cam 48 and the second high cam 49 are integrally formed. Formed to operate the other valve.

The first connection portion 45 connects the integrally formed first low cam 41 and the first high cam 42 and the integrally formed second low cam 48 and the second high cam 49. . Furthermore, the first cam forming part 40 is integrally molded.

On the other hand, the cam lobes of the first and second high cams 42 and 49 are formed in a more protruding shape from the outer circumferential surfaces of the cam shaft 100 compared to the cam lobes of the first and second low cams 41 and 48. Can be. Accordingly, the first and second high cams 42 and 49 implement a high lift of the valve, and the first and second low cams 41 and 48 are low lifts of the valve. Implement In other words, when the valve opening/closing device 5 is connected to the high cams 42 and 49 in rolling contact, a high lift of the valve is implemented, and the valve opening/closing device 5 has the low cams 41 and 48. ) And a low lift of the valve is realized when connected in rolling contact. Furthermore, the first and second high cams 42 and 49 or the first and second low cams that operate the valve as the first cam forming part 40 moves in the axial direction of the cam shaft 100. (41, 48) is selected.

The second cam forming part 60 includes a third low cam 61, a third high cam 62, a fourth low cam 68, a fourth high cam 69, and a second connecting part 65. Includes.

Here, the description of the third low cam 61, the third high cam 62, the fourth low cam 68, the fourth high cam 69, and the second connecting portion 65 is the first row Since it corresponds to the description of the cam 41, the first high cam 42, the second low cam 48, the second high cam 49, and the first connecting portion 45, repeated description will be omitted. do.

The solenoid 10 is provided to change the rotational motion of the cam shaft 100 into a linear motion of the first cam forming part 40 or the second cam forming part 60. That is, when the solenoid 10 is operated, the first cam forming part 40 or the second cam forming part 60 is the axis of the cam shaft 100 according to the rotational movement of the cam shaft 100. Move linearly in the direction. Here, since the solenoid 10 operated on or off by electrical control is obvious to those skilled in the art, further detailed description will be omitted.

The operation unit (30, 50) is formed in a hollow cylindrical shape, the cam shaft 100 is disposed in the outer peripheral surface of the cam shaft 100 by being inserted into the hollow of the operation unit (30, 50). In addition, the hollow of the operation unit (30, 50) may be formed so that the inner circumference of the operation unit (30, 50) has a shape corresponding to the outer circumference of the cam shaft (100). Furthermore, the outer circumference of the operation unit (30, 50) is formed in a circular shape having a constant radius. Furthermore, the operation units 30 and 50 can be moved in the axial direction of the cam shaft 100 by sliding the inner circumferential surface on the outer circumferential surface of the cam shaft 100, and rotating together with the cam shaft 100 It is provided to. Here, the configuration in which the operation units 30 and 50 and the cam shaft 100 are coupled may be implemented according to the design of a person skilled in the art by a coupling method such as a spline.

The solenoid 10 includes a high lift solenoid 12 and a low lift solenoid 14, and the operation units 30 and 50 include a high lift operation unit 30 and a low lift operation unit 50. .

The high lift operation unit 30 is provided to move together with the first cam forming portion 40. In addition, the high lift operation unit 30 rotating together with the cam shaft 100 moves in one direction along the axial direction of the cam shaft 100 according to the operation of the high lift solenoid 12. Thus, a high lift of the valve is realized. 1, the high lift operation unit 30 is shown provided on one end of the first high cam 42, but is not limited thereto.

For convenience of description, one direction in which the high lift operation unit 30 moves so as to implement the high lift of the valve will be expressed as a forward direction.

The low lift operation unit 50 is provided to move together with the second cam forming portion 60. In addition, the low lift operation unit 50 rotating together with the cam shaft 100 moves in the other direction along the axial direction of the cam shaft 100 according to the operation of the low lift solenoid 14. Thus, a low lift of the valve is realized. 1, the low lift operation unit 50 is shown on one end of the fourth low cam 68, but is not limited thereto.

For convenience of description, the other direction in which the low lift operation unit 50 moves so as to implement the low lift of the valve will be expressed in the reverse direction.

The interlocking unit 70 is formed in a hollow cylindrical shape, and the cam shaft 100 is disposed on the outer circumferential surface of the cam shaft 100 by being inserted into the hollow of the interlocking unit 70. In addition, the outer periphery of the interlocking unit 70 is formed in a circular shape with a certain radius. Furthermore, the interlocking unit 70 is provided to be able to move in the axial direction of the cam shaft 100 by sliding its inner circumferential surface on the outer circumferential surface of the cam shaft 100, and to rotate together with the cam shaft 100. .

The interlocking unit 70 is disposed between the integrally formed first cam forming portion 40 and the integrally formed second cam forming portion 60. In addition, the interlocking unit 70 functions to interlock the first cam forming portion 40 and the second cam forming portion 60.

When the high lift operation unit 30 moves in the forward direction, the interlocking unit 70 is operated to move in the forward direction by being pushed by the first cam forming part 40. In addition, while the interlocking unit 70 is operated to move in the forward direction, the integrally formed second cam forming portion 60 is pushed. Therefore, the second cam forming portion 60 moves in the forward direction. That is, the first cam forming portion 40, the interlocking unit 70, and the second cam forming portion 60 are sequentially and stepwisely moved toward the forward direction.

When the low lift operation unit 50 moves in the reverse direction, the interlocking unit 70 is operated to move in the reverse direction by being pushed by the second cam forming unit 60. In addition, as the interlocking unit 70 moves in the reverse direction, the first cam forming portion 40 is formed integrally. Therefore, the first cam forming part 40 moves in the reverse direction. That is, the second cam forming portion 60, the interlocking unit 70, and the first cam forming portion 40 are moved sequentially and stepwise toward the reverse direction.

The pin operating device 20 is provided to move the interlocking unit 70 along the axial direction of the cam shaft 100. In addition, the pin operation device 20 includes a housing 21, a hinge unit 22, a first pin 24, a second pin 25, and a pin fixing unit 27.

The housing 21 is the body of the pin operation device 20 in which the hinge unit 22, the first pin 24, the second pin 25, and the pin fixing unit 27 are mounted.

The hinge unit 22 is provided to hinge on the hinge shaft 23 fixed to the housing 21.

The first pin 24 and the second pin 25 may have a bar shape formed long in one direction.

The first pin 24 moves in a direction protruding from the housing 21 by being pushed by the hinge unit 22 according to the hinge motion of the hinge unit 22. In addition, when the first pin 24 is returned to the original position, the hinge unit 22 is reversely hinged by being pushed by the first pin 24. Furthermore, when the hinge unit 22 reversely hinges, the second pin 24 moves in a direction protruding from the housing 21 by being pushed by the hinge unit 22. That is, when the pin operating device 20 is returned to one of the first pin 24 and the second pin 25 so as not to protrude from the housing 21, the other protrudes from the housing 21 The first and second pins 24 and 25 are interlocked by the hinge unit 22 as much as possible.

The pin fixing unit 27 is provided to fix the pins in the original position among the first and second pins 24 and 25. A locking groove 29 is formed in the first and second pins 24 and 25 so that the pin fixing unit 27 is caught while the first pin 24 or the second pin 25 is in its original position, The pin fixing unit 27 is a reciprocating motion between the first pin 24 and the second pin 25, a part of which is seated in the locking groove 29, and the first pin 24 or the first position 2 Fix the pin 25.

The pin fixing unit 27 is operated by a spring 28, and by a relatively small force pushed by the spring 28, it is connected to any one of the locking grooves 29 of the 1 and 2 pins 24 and 25. It is seated and the 1, 2 pins 24, 25 are separated from the locking groove 29 by a relatively large force actuated. To facilitate this operation, the locking groove 29 and a portion of the pin fixing unit 27 contacting the locking groove 29 may be formed as a curved curved surface.

The high lift operation unit 30, the low lift operation unit 50, and the interlocking unit 70 include guide rails 32, 52, and 72.

The guide rails 32, 52, and 72 may have a groove shape recessed from the outer circumferential surfaces of the operation units 30, 50 and the interlocking unit 70, respectively. In addition, the guide rails 32, 52, and 72 of the groove shape are formed long in the circumferential direction of the operation unit 30, 50 and the interlocking unit 70.

The guide rail 72 of the interlocking unit 70 is in contact with the first pin 24 or the second pin 25 protruding from the housing 21 according to the operation of the pin fixing unit 27, and It is formed to guide the movement of the interlocking unit 70. That is, when the cam shaft 100 is rotated while the first pin 24 or the second pin 25 is inserted into the guide rail 72 of the interlocking unit 70, the guide rail 72 The first pin 24 or the second pin 25 with respect to the rotation of the interlocking unit 70 in which the first pin 24 or the second pin 25 moves along the outer circumferential surface of the interlocking unit 70 ) As the relative motion of the guide is guided, the interlocking unit 70 is moved along the axial direction of the cam shaft 100.

The interlocking unit 70 is moved in the forward direction as the first pin 24 rotates with the cam shaft 100 in a state in contact with the guide rail 72, and the second pin 25 is It is moved in the reverse direction as it rotates with the cam shaft 100 in a state in contact with the guide rail 72.

The high lift solenoid 12 includes a connection pin 16 protruding in a bar shape, and the connection pin 16 is the high lift operation unit 30 according to the operation of the high lift solenoid 12. ) Of the guide rail 32. In addition, the guide rail 32 of the high lift operation unit 30 is formed to contact the connecting pin 16 to guide the movement of the high lift operation unit 30. That is, when the cam shaft 100 is rotated while the connecting pin 16 is inserted into the guide rail 32 of the high lift operation unit 30, the guide rail 32 is connected to the connecting pin 16 ) As the high lift operation unit 30 guides the relative motion of the connecting pin 16 with respect to the rotation of the high lift operation unit 30 moving along the outer circumferential surface of the high lift operation unit 30, the high lift operation unit 30 is the It is moved in the forward direction along the axial direction of the cam shaft 100.

The low lift solenoid 14 includes a connection pin 18 protruding in a bar shape, and the connection pin 18 is the low lift operation unit 50 according to the operation of the low lift solenoid 14. It is in contact with the guide rail (52). In addition, the guide rail 52 of the low lift operation unit 50 is formed to contact the connecting pin 18 to guide the movement of the low lift operation unit 50. That is, when the cam shaft 100 is rotated while the connecting pin 18 is inserted into the guide rail 52 of the low lift operation unit 50, the guide rail 52 is connected to the connecting pin 18 ) As the low lift operation unit 50 guides the relative motion of the connecting pin 18 with respect to the rotation of the low lift operation unit 50 moving along the outer circumferential surface of the low lift operation unit 50, the low lift operation unit 50 is the It is moved in the reverse direction along the axial direction of the cam shaft 100.

The multi-stage variable valve lift apparatus 1 according to an embodiment of the present invention further includes a stopper 90 and locking jaw forming parts 80 and 85.

Two stoppers 90 may be provided to limit the movement of the first cam forming portion 40 and the movement and movement of the second cam forming portion 60, respectively.

The engaging jaw forming portions 80 and 85 are formed in a hollow cylindrical shape, and the cam shaft 100 is inserted into the hollow of the engaging jaw forming portions 80 and 85 to the outer circumferential surface of the cam shaft 100. Is placed. In addition, the hollow of the locking jaw forming portions 80 and 85 may be formed so that the inner circumference of the locking jaw forming portions 80 and 85 has a shape corresponding to the outer circumference of the cam shaft 100. Furthermore, the locking jaw forming portions 80 and 85 may be moved in the axial direction of the cam shaft 100 by sliding the inner circumferential surface thereof on the outer circumferential surface of the cam shaft 100, together with the cam shaft 100 It is provided to rotate. Here, a configuration in which the locking jaw forming parts 80 and 85 and the cam shaft 100 are coupled may be implemented according to a design of a person skilled in the art by a coupling method such as a spline.

The locking jaw forming portions 80 and 85 include two locking jaw forming portions 80 and 85 divided into a first locking jaw forming portion 80 and a second locking jaw forming portion 85. In addition, the first locking jaw forming portion 80 is provided to move together with the high lift operation unit 30 and the first cam forming portion 40, the second locking jaw forming portion 85 is the It is provided to move together with the low lift operation unit 50 and the second cam forming portion 60. Furthermore, the first locking jaw forming portion 80 and the second locking jaw forming portion 85 form locking jaws 82 and 87. Here, the locking jaw 82 formed on the first locking jaw forming portion 80 is referred to as a first locking jaw 82 and the locking jaw 87 formed on the second locking jaw forming portion 85 The second locking jaw 87 will be referred to as.

The first locking jaw 82 is a protrusion protruding at least two or more from the outer circumferential surface of the first locking jaw forming portion 80 to limit the forward and reverse movement of the first cam forming portion 40. In addition, the stopper 90 provided in the first locking jaw forming portion 80 is in close contact with the outer peripheral surface of the first locking jaw forming portion 80 by the elastic force of the spring 92, the first locking jaw ( 82) to limit the movement of the first cam forming portion 40.

The second locking jaw 87 is a protrusion protruding at least two or more from the outer circumferential surface of the second locking jaw forming portion 85 to limit the forward and reverse movement of the second cam forming portion 60. In addition, the stopper 90 provided in the second locking jaw forming portion 85 is in close contact with the outer peripheral surface of the second locking jaw forming portion 85 by the elastic force of the spring 92, the second locking jaw ( 87) restricts the movement of the second cam forming part 60.

Hereinafter, a configuration of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. On the other hand, in Figures 2 to 4, the high lift operation unit 30, the first cam forming portion 40, and the configuration of the first locking jaw forming portion 80 are shown, but the low lift operation unit ( 50), the second cam forming portion 60, and the configuration of the second locking jaw forming portion 85 are the high lift operation unit 30, the first cam forming portion 40, and the first It is the same as the configuration of the locking jaw forming portion 80.

2 is an exploded view of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention, and FIG. 3 is an exploded view of an operating unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention. 4 is a cross-sectional view of an operation unit, a cam forming unit, and a locking jaw forming unit according to an embodiment of the present invention.

2 to 4, the operation unit (30, 50) is formed between the cam forming part (40, 60) and the cam forming part (80, 85) so as to be disposed between the cam forming part ( 40, 60) and the engaging jaw forming portions 80, 85.

The operation unit (30, 50) includes a cam engaging hole 33 and the engaging jaw engaging hole 35.

The cam coupling hole 33 is formed at one end of the operation units 30 and 50 to which the cam forming portions 40 and 60 are coupled, and a width larger than the radius of the inner circumference of the operation units 30 and 50 is formed. Hall. Here, the cam coupling hole 33 may be a circular shape concentric with the inner circumference of the operation units 30 and 50, but is not limited thereto.

The engaging jaw engaging hole 35 is formed at the other end of the operating unit 30, 50 to which the engaging jaw forming portions 80, 85 are coupled, and has a width greater than the radius of the inner circumference of the operating unit 30, 50. It is a large hole. Here, the engaging jaw engaging hole 35 may be a circular shape concentric with the inner circumference of the operation units 30 and 50, but is not limited thereto.

The cam forming portions 40 and 60 form a cam insertion portion 43.

The cam inserting portion 43 is a portion that is inserted into the cam coupling hole 33. In addition, the cam insertion portion 43 is formed in a shape corresponding to the cam coupling hole 33. Furthermore, the cam insertion portion 43 has a size that can be pressed into the cam coupling hole 33.

The locking jaw forming portions 80 and 85 form the locking jaw inserting portion 84.

The locking jaw inserting portion 84 is a portion that is inserted into the locking jaw coupling hole 35. In addition, the engaging jaw insertion portion 84 is formed in a shape corresponding to the engaging jaw engaging hole 35. Furthermore, the locking jaw inserting portion 84 has a size capable of being pressed into the engaging jaw coupling hole 35.

As shown in Figure 4, the operation unit (30, 50), the cam forming portion (40, 60), and the engaging jaw forming portion (80, 85) includes a spline (S).

The spline (S) is the operating unit (30, 50), the cam forming portion (40, 60), and the engaging jaw forming portion (80, 85) and the cam shaft 100 so that the spline is coupled to the operating unit (30, 50), the cam forming portion (40, 60), and is formed on the inner circumferential surface of the locking jaw forming portion (80, 85). On the other hand, the range in which the splines (S) are formed on the inner circumferential surfaces of the operation units (30, 50), the cam forming portions (40, 60), and the locking jaw forming portions (80, 85) according to the design of a person skilled in the art Can be set.

The spline (S) is a broaching machine after the cam inserting portion 43 is pressed into the cam engaging hole 33 and the engaging jaw inserting portion 84 is pressed into the engaging jaw engaging hole 35. By the broaching machine) it can be simultaneously processed on the inner peripheral surface of the operation unit (30, 50), the cam forming portion (40, 60), and the locking jaw forming portion (80, 85).

Thus, the operation unit (30, 50), the cam forming portion (40, 60), and the engaging jaw forming portion (80, 85) is coupled to the operating unit (30, 50), the cam forming portion ( 40, 60), and the locking jaw forming portions 80 and 85 may be independently processed.

When the operation unit (30, 50), the cam forming portion (40, 60), and the locking jaw forming portion (80, 85) is not formed independently and is formed integrally, the operation unit (30, 50) , The processing methods of the cam forming parts 40 and 60 and the locking jaw forming parts 80 and 85 cannot be changed. In particular, if the operation units 30, 50, the cam forming portions 40, 60, and the locking jaw forming portions 80, 85 are processed by three-dimensional precision machining, unnecessary production cost is required. You can.

On the other hand, if the operation unit (30, 50), the cam forming portion (40, 60), and the locking jaw forming portion (80, 85) is independently processed, precision processing as the operation unit (30, 50) Only the required components can be processed by methods such as three-dimensional precision processing.

According to the embodiment of the present invention as described above, the pin operation device 20 and the pin operation device 20 according to the operation of the cam shaft in the axial movement of the interlocking unit 70 while having a simple configuration and efficient Operation may be enabled. In addition, the cam forming parts 40 and 60 disposed in different cylinders are operated stepwise by the interlocking unit 70, so that interference between components can be prevented. Further, the operation units 30, 50, cam forming portions 40, 60, and the locking jaw forming portions 80, 85 are independently processed and combined, thereby reducing production cost.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and is easily changed and equalized by those skilled in the art from the embodiments of the present invention. Includes all changes to the extent deemed acceptable.

1: Multi-stage variable valve lift device
5: valve switchgear
10: solenoid 16, 18: connecting pin
20: pin actuator 22: hinge unit
24: first pin 25: second pin
30: High lift operation unit 33: Cam engaging hole
35: engaging jaw engaging hole 32, 52, 72: guide rail
40, 60: cam forming portion 43: cam insertion portion
41, 48, 61, 68: low cam 42, 49, 62, 69: high cam
50: low lift operation unit
70: interlocking unit
80, 85: locking jaw forming portion 82, 87: locking jaw
84: locking jaw insert
90: stopper
100: camshaft
S: Spline

Claims (16)

A cam shaft rotating by driving the engine;
At least two cam forming parts disposed on an outer circumferential surface of the cam shaft so as to rotate together with the cam shaft and move in an axial direction of the cam shaft;
A valve opening/closing device operated by either the high cam or the low cam formed in the cam forming part;
An operation unit disposed on an outer circumferential surface of the cam shaft to move together with any one of the two or more cam forming parts;
A solenoid for selectively moving the operation unit along the axial direction of the cam shaft;
Rotating with the cam shaft, and is disposed movably in the axial direction of the cam shaft between any one of the cam forming portion and the other of the cam forming portion on the outer peripheral surface of the cam shaft, among the cam forming portion An interlocking unit, which moves axially as one moves in the axial direction, and moves the other of the cam forming portions in the axial direction of the cam shaft;
A pin actuating device for selectively moving the interlocking unit along the axial direction of the cam shaft;
A locking jaw forming portion disposed on an outer circumferential surface of the cam shaft to move together with any one of the two or more cam forming portions, and forming a locking jaw to limit movement of the cam forming portion; And
A stopper provided to limit the movement of the cam forming portion by engaging the locking jaw;
Including,
The cam forming portion and the operation unit are independently formed and coupled,
A cam engaging hole to which the cam forming portion is coupled is formed at one end of the operation unit, and a cam inserting portion having a shape corresponding to the cam engaging hole is formed in the cam forming portion to be pressed into the cam engaging hole. Multi-stage variable valve lift device. According to claim 1,
The one cam forming portion, the interlocking unit, and the other cam forming portion is a multi-stage variable valve lift device, characterized in that is operated to be sequentially moved along the axial direction of the cam shaft. According to claim 1,
As the cam forming portion is moved in the axial direction of the cam shaft, the valve opening and closing device is operated by either the high cam or the low cam, so that the valve lift is variable so that either the high lift or the low lift is selected. Features a multi-stage variable valve lift device. According to claim 1,
The operation unit,
Multi-stage variable valve lift device, characterized in that the cylindrical shape is formed with a hollow into which the cam shaft is inserted. The method of claim 4,
A guide rail having a shape in which a groove extends along an outer circumference is formed in the operation unit,
The solenoid is provided with a connecting pin that selectively contacts the guide rail,
The multi-stage variable valve lift device according to claim 1, wherein the guide rail guides the axial movement of the cam shaft of the operation unit as the cam shaft rotates while the connecting pin is in contact with the guide rail. According to claim 1,
The interlocking unit,
Multi-stage variable valve lift device, characterized in that the cylindrical shape is formed with a hollow into which the cam shaft is inserted. The method of claim 6,
In the interlocking unit, a guide rail having a shape in which a groove extends along an outer circumference is formed,
The pin operation device is provided with a pin that selectively contacts the guide rail,
The multi-stage variable valve lift apparatus according to claim 1, wherein the guide rail guides the axial movement of the cam shaft of the interlocking unit as the cam shaft rotates while the pin contacts the guide rail. The method of claim 7,
The pin is provided with two,
The guide rail,
The interlocking unit is formed to move in one direction along the axial direction of the cam shaft by one of the two pins, and to be moved in the other direction along the axial direction of the cam shaft by the other of the two pins. Multi-stage variable valve lift device, characterized in that. According to claim 1,
The operation unit and the solenoid are each provided two,
Multi-stage variable valve lift device, characterized in that the cam forming portion and the interlocking unit are alternately disposed between the two operation units. The method of claim 9,
The interlocking unit disposed between two neighboring cam forming portions among the at least two cam forming portions is pushed by one of the two neighboring cam forming portions and pushes the other, while the at least two cam forming portions are pushed. Multi-stage variable valve lift device characterized in that the stepwise movement. delete delete According to claim 1,
The locking jaw forming portion and the operating unit are formed independently and coupled multi-stage variable valve lift device. The method of claim 13,
A locking jaw coupling hole is formed at the other end of the operation unit to which the locking jaw forming portion is coupled, and a locking jaw inserting portion having a shape corresponding to the locking jaw coupling hole to be pressed into the locking jaw coupling hole is formed in the locking jaw forming portion. Multi-stage variable valve lift device, characterized in that formed. The method of claim 14,
The cam forming portion and the locking jaw forming portion is a cylindrical shape having a hollow into which the cam shaft is inserted,
The operation unit, the cam forming portion, and the locking jaw forming portion multi-stage variable valve lift device, characterized in that the spline coupled to the cam shaft. The method of claim 15,
After the cam inserting portion is press-fitted into the cam engaging hole, and after the engaging jaw inserting portion is pressed into the engaging jaw engaging hole, splines are simultaneously processed on the inner circumferential surfaces of the operation unit, the cam forming portion, and the engaging jaw forming portion. Multi-stage variable valve lift device.

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