KR101736806B1 - Variable valve lift actuator of engine - Google Patents

Abstract

The present invention relates to a variable valve lift device of an engine. The variable valve lift device of an engine comprises: a first body which rotates within a predetermined angle range by a rotational movement of a high-speed cam coupled to a camshaft; a second body which is connected to or separated from the first body, rotates by the rotational movement of the high-speed cam when connected to the first body and rotates by a rotational movement of a low-speed cam provided on both sides of the high-speed cam when separated from the first body to adjust a lift amount of a valve; a latching pin coupled to the first body through the second body to be able to appear and disappear toward and from the first body so as to connect or separate the first body and the second body; a driving module for operating the appearing and disappearing of the latching pin; a rotation shaft disposed on an upper portion of the valve and installed across both side walls of the first body and the second body such that the first body is rotatable; and a return spring which is installed on the rotation shaft and provides a restoring force to return the first body rotated by the cam to the original position. As a result, the lift amount of the vale can be variably controlled in two stages of a high-speed mode and a low-speed mode by connecting or disconnecting the first body and the second body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable valve lift apparatus for an engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable valve lift apparatus for an engine, and more particularly, to a variable valve lift apparatus for an engine that controls a lift amount of a valve in accordance with an operating condition of the vehicle.

A valve mechanism applied to an automobile engine supplies a mixer to the combustion chamber and discharges the combustion gas according to the stroke of the engine.

In recent years, variable valve mechanisms have been developed to optimize the mixture flow rate and the combustion gas discharge efficiency by varying the valve opening rate and opening / closing timing according to the operating conditions of the engine, i.e., the rotational speed of the engine and the operating range of the engine And is being applied to the engine.

Accordingly, variable valve mechanisms for automobile engines can improve engine performance such as fuel economy, torque, output, etc. of the engine and reduce the amount of exhaust gas.

Such a variable valve mechanism for an automobile engine includes a variable valve timing mechanism for varying the opening and closing timing of the valve, a variable valve lift mechanism for varying the opening amount of the valve, and a variable valve operating angle mechanism for changing the valve operating angle.

Among them, the variable valve lift mechanism is divided into a rocker arm type, a pivot type, a tappet type, and a bucket type in order to improve the output and fuel efficiency in the medium to low speed mode.

The present applicant has filed a patent application for a variable valve lift mechanism disclosed in the following Patent Documents 1 to 3 and the like.

However, the variable valve lift mechanism according to the related art has a problem that the displacement of the intake valve is always constant regardless of the load of the vehicle, and the engine speed at which the optimum efficiency is exhibited is limited.

On the other hand, in the past, hydraulic pressure was used for stopping the valve, but the structure of the variable valve lift mechanism became complicated, resulting in a problem of deteriorated workability.

In addition, when the hydraulic pressure is used, there is a problem that the operating oil pressure is changed due to the viscosity of the operating oil being sensitive to temperature, resulting in malfunction of the variable valve lift mechanism and inaccuracy in adjusting the valve lift amount.

In order to overcome such a problem, the present applicant has proposed a method of controlling the operation of a cylinder in a low-speed, low-load state of an engine and the like in the following Patent Documents 4 and 5, And variable speed control of the low speed mode to improve the efficiency of the engine.

Korean Patent Registration No. 10-1084739 (Announcement on November 22, 2011) Korean Patent Registration No. 10-1084741 (Announcement on November 22, 2011) Korean Patent Publication No. 10-2012-0088363 (published on August 8, 2012) Korean Patent Registration No. 10-1465635 (Announcement on Nov. 27, 2014) Korean Patent Registration No. 10-1465636 (Announcement on Nov. 27, 2014)

However, in Patent Documents 4 and 5, since the compression spring for returning the rotational motion of the first body is provided, a separate head machining operation is required for the first body.

Therefore, Patent Document 4 and Patent Document 5 have a problem that workability of a manufacturing operation is reduced due to a separate head machining operation, and it is difficult to apply to an engine of an actual vehicle.

In Patent Documents 4 and 5, as the rotational motion of the cam is transmitted to the first body of the sliding type to adjust the lift amount of the valve, power loss due to friction between the first body and the cam occurs, .

In Patent Documents 4 and 5, since the pivot point serving as the rotation center of the first body is provided on the side of the drive module, the weight and the inertial force are increased and the dynamic characteristics are lowered.

In addition, Patent Literature 4 and Patent Literature 5 have a problem in that, by providing a separate latching spring for providing a restoring force to the latching pin, the number of parts increases and workability is lowered and manufacturing cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable valve lift apparatus for an engine that controls a lift amount of a valve in accordance with an operating condition of a vehicle.

Another object of the present invention is to provide an engine variable valve lift apparatus capable of deactivating some cylinders in a low-speed, low-load state of the vehicle.

It is still another object of the present invention to provide an adjustable valve lift apparatus for an engine that can improve workability in manufacturing work and reduce weight and inertia force to improve dynamic characteristics.

In order to achieve the above object, the variable valve lifting device of an engine according to the present invention includes a first body rotating in a predetermined angular range by a rotational motion of a high-speed cam coupled to a camshaft, And when the first camshaft is separated from the first camshaft, the first camshaft rotates by a rotational motion of a low-speed cam provided on both sides of the camshaft, A latching pin which is coupled to the first body so as to be capable of protruding and retracting toward the first body through the second body so as to connect or disconnect the first body and the second body; And a valve disposed above the valve and installed across both side walls of the first body and the second body such that the first body is rotatable And a return spring installed on the rotating shaft to provide a restoring force for returning the first body rotated by the high speed cam to its original position, so that the lift amount of the valve is switched to the high speed mode And a low-speed mode.

As described above, according to the variable valve lifting device of the engine according to the present invention, the stop control operation of the valve for deactivating some cylinders and the two-stage variable control operation of the high speed mode and the low speed mode can be performed .

That is, according to the present invention, by selectively connecting or disconnecting the first body and the second body by using the latching pin, the valve opening / closing operation and the dormancy control operation are implemented to deactivate some cylinders in the low- .

Thus, according to the present invention, it is possible to minimize the fuel consumption amount in the low-speed and low-load state of the engine, thereby improving the efficiency of the engine and maximizing the fuel efficiency of the vehicle.

According to the present invention, since the return spring for returning the first body to the original position is provided inside the first body, It is possible to eliminate the head machining operation of the body.

Thus, according to the present invention, it is possible to improve the workability by eliminating the head machining work of the first body due to the application of the compression spring in the past, and to simplify the structure of the variable valve lifting device of the engine, It is possible to obtain the effect of being able to be applied.

According to the present invention, the pivot point serving as the rotation center of the first body is provided on the valve side to reduce the weight and the inertial force, thereby improving the dynamic characteristics.

According to the present invention, since the rollers are provided on the first body and the second body and the rotational force is transmitted to the cams, the power loss due to the frictional force acting between the cams and the cam is minimized, The effect can be obtained.

Further, according to the present invention, the latching spring for providing the restoring force to the latching pin is removed, and the latching pin is integrally coupled to the tip of the solenoid formed in the T shape to perform forward and backward movement, , The mode is smoothly switched, and the number of parts is reduced, thereby reducing the manufacturing cost.

According to the present invention, it is possible to realize the two-stage control operation and the stop control operation of the valve according to the configuration of the cam by using one variable valve lift apparatus.

In addition, according to the present invention, since the roller rocker arm and the second body are integrally manufactured by the swing arm type structure instead of the conventional direct acting type, the cost reduction can be realized, and by changing the shape of the front wall of the second body The effect of facilitating the latching performance can be obtained.

1 is a perspective view of a variable valve lift apparatus of an engine according to a first embodiment of the present invention,
Fig. 2 is a partially exploded perspective view of the variable valve lift apparatus of the engine shown in Fig. 1,
3 is a partially enlarged cross-sectional view of a head provided with a variable valve lifting device of the engine shown in Fig. 1,
FIG. 4 and FIG. 5 are operation states showing operation states of the variable valve lift apparatus of the engine according to the first embodiment of the present invention,
6 is a perspective view of a variable valve lift apparatus of an engine according to a second embodiment of the present invention,
FIG. 7 is an exploded perspective view of the variable valve lift apparatus of the engine shown in FIG. 6,
FIG. 8 and FIG. 9 are operational states showing operation states of a variable valve lift apparatus of an engine according to a second embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a variable valve lifting device for an engine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The variable valve lifting device of an engine according to the present invention includes a dormant control operation for activating or deactivating a cylinder according to an operation condition of a vehicle and a two-stage variable control operation for controlling the lift amount of the valve in two stages of high speed and low speed To be performed.

This specification describes the configuration for implementing the stop control operation of the valve as the first embodiment, and the configuration for performing the two-stage variable control of the valve on the basis of the configuration of the first embodiment will be described as the second embodiment.

To this end, the camshaft of the engine is provided with one cam when the stop control operation of the valve is implemented, and when the two-stage variable control operation of the valve is implemented, the low speed cam is installed on both sides of the high speed cam and the high speed cam It should be noted that

FIG. 1 is a perspective view of a variable valve lift apparatus of an engine according to a first embodiment of the present invention, and FIG. 2 is a partially exploded perspective view of a variable valve lift apparatus of the engine shown in FIG.

In the drawing, 'F' indicates forward, 'B' indicates rear, 'U' indicates upward, 'D' indicates down, 'L' indicates left, and 'R' indicates right.

As shown in Figs. 1 and 2, the variable valve lifting device of the engine according to the first embodiment of the present invention is a variable valve lifting device of an engine, which is driven by a rotational motion of a cam 11 coupled to a camshaft 10, A second body 30 for opening or closing the valve 14 or keeping the valve 14 closed based on whether or not the first body 20 is connected to the first body 20, And a driving module 50 for projecting and retracting the latching pin 40 and the latching pin 40 which are operatively coupled to the body 30 in such a manner as to protrude and retract toward the front of the first body 20 to connect or disconnect the body 30.

In addition, the variable valve lifting device of the engine according to the preferred embodiment of the present invention is mounted on a rotary shaft 21 on which the first body 20 rotates, 20 to return to their original position.

The return spring 15 may be provided as a torsion spring having a center portion protruding forward.

For example, the center of the return spring 15 is formed to protrude forward so as to be supported by the front wall 31 of the second body 30 to be described below, and both ends of the return spring 15 And may be supported on a support jaw 26 formed on both side walls of the first body 20.

As described above, according to the present invention, since the return spring for returning the first body to the original position is provided on the rotation axis of the first body, It is possible to eliminate the head machining operation of the body.

Accordingly, the present invention improves workability by eliminating the head machining operation of the first body due to the application of the compression spring and simplifies the structure of the variable valve lift device of the engine, can do.

The first body 20 may have both side walls and a rear wall so as to have a substantially U-shaped cross-section when viewed from above.

A rotating roller 22 rotating by the rotation of the cam 11 may be provided in the first body 20 to minimize friction when the return spring 15 and the cam 11 come into contact with each other.

In this embodiment, the latching spring for providing the restoring force to the latching pin 40 is removed from the engagement space 21 in the first body 20.

A coupling hole 23 is formed at the front end of both side walls of the first body 20 so as to engage with the rotation shaft 21. A roller shaft 24 of the rotary roller 22 is provided at the center of both side walls of the first body 20 The mounting hole 25 may be formed.

The rotary shaft 21 is inserted through both side walls of the first body 20 and both side walls of the second body 30 and a return spring 15 may be installed on the outer peripheral surface of the central portion of the rotary shaft 21.

Accordingly, the first body 20 can rotate about the rotation axis 21.

The roller shaft 24 is inserted through a pair of mounting holes 25 formed in both side walls of the first body 20 and is inserted between the roller shaft 25 and the rotary roller 22 by a rotary roller 22 Can be smoothly rotated.

On the inner surfaces of both side walls of the first body 20, a support jaw 26 may be formed to support both ends of the return spring 15.

The first and second bodies 20 and 30 are integrally rotated by the rotation of the cam 11 during forward movement of the latching pin 40 on the rear wall of the first body 20, The latching jaw 27 can be formed.

The second body 30 may include a front wall 31 and both side walls such that the second body 30 is disposed on the front and both side surfaces of the first body 20 so that the rear surface of the second body 30 is open when viewed from above.

Both side walls of the second body 30 may comprise an inner wall 32 and an outer wall 33, respectively.

A pressing plate 34 for pressing the upper end of the valve 14 between the inner wall 32 and the outer wall 33 may be provided on both sides of the front wall 31 of the second body 30. [

The pressure plate 34 is installed along the horizontal direction and can move the valve 14 by opening and closing the valve by pressing the upper end of the valve 14 when the second body 20 rotates.

The rear end of the second body 30 can be supported by the pivot support mechanism 16.

In this embodiment, the pivot support mechanism 16 may be provided with a hydraulic lash adjuster that automatically adjusts the clearance of the valve 14 using hydraulic pressure.

For example, the hydraulic lash adjuster may be extended or retracted according to a change in pressure of the oil in a state where oil is continuously supplied to the inside of the hydraulic lash adjuster, thereby finely adjusting the interval of the valve.

That is, the hydraulic lash adjuster maintains a contracted state when the oil pressure is lower than a predetermined set pressure, as the check valve provided therein is kept closed.

On the other hand, when the pressure of the oil becomes equal to or higher than a predetermined set pressure, the internal lash adjuster is extended to move the rear end of the second body 30 upward, (14).

To this end, a support plate 35 may be formed on the outside of the pair of inner side walls 32 of the second body 30, respectively, in contact with the upper end of the pivot support mechanism 16.

Accordingly, the second body 30 can rotate around the pivot support mechanism 16. [

A mounting portion 36 is provided at a lower end portion of the second body 30 so as to be slidable forward of the latching pin 40. A center portion of the mounting portion 36 is provided with a moving space 37 (see FIG. 3) can be formed.

These mounting portions 36 may be provided between the rear ends of the pair of inner walls 32 of the second body 30.

The latch pin 40 is integrally coupled to the drive pin 51 of the drive module 50 and can move forward or backward as the drive pin 51 moves forward or backward.

For this purpose, the latching pin 40 is formed in a substantially circular or elliptical cylindrical shape in cross section, and has a mounting space (not shown) corresponding to the tip of the driving pin 51, (41) may be formed.

The drive module 50 may be provided with a solenoid operable to move the drive pin 51 in the forward and backward directions in accordance with a control signal of an electronic control unit (not shown) for controlling the operation of the engine.

For example, when the power is applied by the control signal in a state where the tip of the driving pin 51 is mounted on the latching pin 40, the solenoid generates a magnetic field in the coil wound in the solenoid, So that the latching pin 40 can be moved to move forward.

When the power is shut off by the control signal, the solenoid can return the latch pin 40 to its original position by moving the drive pin 51 backward as the magnetic field generated therein is removed.

In the meantime, in the present embodiment, the driving module for operating the protruding pin is described as a solenoid. However, the present invention is not limited to this, and various types of operating units, such as a motor, The present invention is not limited thereto.

3 is a partially enlarged cross-sectional view of the head provided with the variable valve lifting device of the engine shown in Fig.

3, the variable valve lifting device of the engine may be provided in a number corresponding to each cylinder of the engine, and may be installed at an upper portion of the head 60 so as to be inclined by a predetermined set angle.

4 and 5, an operation method of the variable valve lift apparatus of the engine according to the first embodiment of the present invention will be described in detail.

4 and 5 are operational state diagrams showing the operational state of the variable valve lift apparatus of the engine according to the first embodiment of the present invention.

Fig. 4 shows an operating state in which the valve is opened and closed by the rotational motion of the cam in the variable valve lifting device of the engine, and Fig. 5 shows an operating state of stopping the valve.

The variable valve lifting device of the engine according to the first embodiment of the present invention drives the drive module 50 as shown in FIG. 4 when opening and closing the valve 14 by the rotational motion of the cam 11 The catching pin 40 is moved forward.

The first latching pin 40 is engaged with the engaging protrusion 27 formed on the rear wall of the first body 20 while the distal end of the first latching pin 40 protrudes forward through the fitting portion 36 of the second body 30 Accordingly, the first body 20 and the second body 30 are connected.

Accordingly, in the variable valve lifter of the engine according to the first embodiment of the present invention, when the first and second bodies 20 and 30 are rotated in a predetermined angular range by the rotational motion of the cam 11, 14 can be lifted and lowered to open and close.

The central portion of the return spring 15 installed on the rotary shaft 21 is supported at the lower end of the front wall 31 of the second body 30 and the opposite ends of the return spring 15 are supported by the support jaws 26).

Thus, the return spring 15 can return the first and second bodies 20 and 30, which have been rotated by the cam 11, to their original positions by providing a restoring force to the first body 20.

On the other hand, when the stop control operation of the valve 14 is implemented in order to deactivate some cylinders in the variable valve lift apparatus of the engine according to the first embodiment of the present invention, Is cut off.

Thus, the latch pin 40 returns to its original position as the drive pin 51 of the drive module 50 moves backward, as shown in Fig.

At this time, as the latching pin 40 moves backward and is accommodated in the mounting portion 36 of the second body 30, the first body 20 and the second body 30 are separated.

Then, the front end portion and the rear end portion of the second body 30 are fixed in contact with the upper end of the valve 14 and the upper end of the pivot support mechanism 16, respectively.

Therefore, in the variable valve lifting device of the engine according to the preferred embodiment of the present invention, even when the cam 11 rotates, the second body 30, which is in contact with the upper end of the valve 14, A dormant control operation can be implemented.

As described above, according to the present invention, by selectively connecting or disconnecting the first body and the second body using the latching pin, the valve opening / closing operation and the stopping control operation are realized, thereby enabling some cylinders to be inactivated .

Accordingly, the present invention minimizes fuel consumption at low speed and low load conditions of the engine, thereby improving the efficiency of the engine and maximizing the fuel consumption of the vehicle.

Through the above-described process, the present invention can perform the stop control operation of the valve for deactivating some cylinders according to the operation condition of the engine.

Next, the configuration of a variable valve lift apparatus of an engine according to a second embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a perspective view of a variable valve lift apparatus of an engine according to a second embodiment of the present invention, and FIG. 7 is a partially exploded perspective view of a variable valve lift apparatus of the engine shown in FIG.

6 and 7, the variable valve lift apparatus of an engine according to the second embodiment of the present invention is similar to that of the first embodiment except that the valve lift amount of the valve is set to a high speed Or some configuration may be added to perform two-stage variable control in the low speed mode.

That is, the camshaft 10 is provided with a high-speed cam 12 for controlling the lift amount of the valve 14 to the maximum in the high-speed and high-load state of the engine and a high- A low-speed cam 13 for minimizing control can be provided.

The high speed cam 12 can be manufactured in a shape corresponding to the cam 11 of the first embodiment.

The low speed cams 13 are provided in pairs so as to be in contact with both sides of the second body 30 and can be installed on both sides of the high speed cam 12, respectively.

The low speed cam 13 is made to have a maximum diameter smaller than the maximum diameter of the high speed cam 12. [

On both sides of the second body 30, there may be provided first and second rollers 38 and 39 which rotate in contact with the low-speed cam 13 in a low-speed and low-load state of the engine.

The outer side walls 33 on both sides of the second body 30 each have a length corresponding to the length of the inner side wall 32 and a pressing plate 34 and a pressing plate 34 are provided between the outer side wall 33 and the inner side wall, A support plate 35 may be formed.

And the roller shaft 24 may be extended to a length corresponding to the distance between the pair of outer walls 33 of the second body 30. [

The first and second rollers 38 and 39 can be rotatably installed on the roller shaft 24 which is coupled to both the inner side wall 32 and the outer side wall 33 of the second body 30.

Next, a method of operating the variable valve lift apparatus of an engine according to a second embodiment of the present invention will be described in detail with reference to FIGS. 8 and 9. FIG.

8 and 9 are operational state diagrams showing the operational state of the variable valve lift apparatus of the engine according to the second embodiment of the present invention.

Fig. 8 shows the operating state of the variable valve lift apparatus of the engine operating in the high-speed mode in the high-speed and high-load state of the engine. Fig. 9 shows the variable valve lift apparatus of the engine operating in the low- The operating state of the device is shown.

The variable valve lifting device of the engine according to the second embodiment of the present invention drives the drive module 50 to move the catching pin 40 forward as shown in FIG. 8 when the engine is in a high speed and high load state.

The first latching pin 40 is engaged with the engaging protrusion 27 formed on the rear wall of the first body 20 while the distal end of the first latching pin 40 protrudes forward through the fitting portion 36 of the second body 30 Accordingly, the first body 20 and the second body 30 are connected.

At this time, the first body 20 comes into contact with the high-speed cam 12 mounted on the camshaft 10 and rotates together with the second body 30.

Accordingly, in the variable valve lifter of the engine according to the second embodiment of the present invention, as the first and second bodies 20 and 30 are rotated in a preset angular range by the rotational motion of the high speed cam 12, (14) can be moved up and down.

At this time, as the lift amount H of the valve 14 by the high speed cam 12 becomes larger than the lift amount h (see Fig. 9) of the valve 14 by the low speed cam 13, The flow rate of the air to be supplied to the air-

9, when the engine is in a low-speed and low-load state, the latching pin 40 is mounted on the mounting portion (not shown) of the second body 30 36 in the state where the first body 20 and the second body 30 are separated from each other.

At this time, the first and second rollers 38 and 39 provided on the second body 30 come into contact with the pair of low-speed cams 13 provided on the camshaft 10 and rotate.

Then, the second body 30 rotates around the pivot support mechanism 16 by the rotation of the low-speed cam 13, thereby opening and closing the valve 14.

At this time, as the lift amount h of the valve 14 by the low speed cam 13 becomes smaller than the lift amount H (see Fig. 8) of the valve 14 by the high speed cam 12, The flow rate of the air to be supplied to the fuel cell 1 decreases.

As described above, according to the present invention, the lift amount of the valve can be controlled in two stages, that is, the high speed mode and the low speed mode, by connecting or disconnecting the first body and the second body using the latching pin, have.

In the first and second embodiments, the stopping control operation of the valve and the lift amount of the valve are described as performing the two-stage control operation of the high-speed mode and the low-speed mode using the configuration of each embodiment, But the present invention is not limited thereto.

For example, the present invention can implement the stop control operation of the valve when the configuration of the second embodiment is applied to the camshaft provided only with the high-speed cam.

That is, the present invention may change the configuration of the cam only, and implement the rest control operation together with the two-stage control operation of the valve depending on the configuration of the cam, using the configuration of the second embodiment.

10 is a perspective view of a variable valve lift apparatus of an engine according to a third embodiment of the present invention.

As shown in FIG. 10, the variable valve lifting device of the engine according to the third embodiment of the present invention is similar to that of the second embodiment, except that the upper and lower ends of the center portion of the return spring are fixed to improve the latching performance So as to form an installation hole at the center of the front wall.

That is, the front wall may include a first fixing bar for fixing the center upper end of the return spring about the installation hole, and a second fixing bar for fixing the lower end of the center of the return spring.

Therefore, the central portion of the return spring is fixed to the mounting hole between the first fixing bar and the second fixing bar forming the front wall of the second body, and both ends of the return spring are supported by the supporting jaws formed on both side walls of the first body .

Thus, the return spring provides a restoring force for returning the first body rotated by the cam to its original position, and it is possible to facilitate the latching according to the protruding and retreating operation of the latching pin.

Through the above-described process, the present invention can perform a stop control operation of a valve for deactivating some cylinders and a two-stage variable control operation for a high speed mode and a low speed mode according to an engine operating condition.

Although the invention made by the present inventors has been described concretely with the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a variable valve lift apparatus for an engine that performs a stop control operation of a valve for deactivating some cylinders and a two-stage variable control operation for a high speed mode and a low speed mode in accordance with an engine operating condition.

10: camshaft 11: cam
12: High speed cam 13: Low speed cam
14: valve 15: return spring
16: pivot support mechanism 20: first body
21: rotating shaft 22: rotating roller
23: engaging hole 24: roller shaft
25: installation hole 26: support jaw
27: latching jaw 30: second body
31: front wall 311: installation hole
312,313: first and second fixing bars 32: inner side walls
33: outer side wall 34: pressure plate
35: support plate 36: mounting portion
37: moving space 38, 39: first and second rollers
40: Latching pin 41: Mounting space
50: drive module 51: drive pin
60: Head

Claims (8)

A first body that rotates within a predetermined angular range by rotational movement of a high-speed cam coupled to the camshaft,
The first and second bodies being connected to or separated from the first body and being rotated by rotation of the high-speed cam when connected to the first body, and when the first body is separated from the first body, A second body for adjusting the lift amount of the valve by rotational motion,
A latching pin which is coupled to the first body so as to be projected and moved toward the first body through the second body to connect or separate the first body and the second body,
A driving module for causing the latching pin to protrude and retract and
A rotary shaft disposed above the valve and installed across both side walls of the first body and the second body such that the first body is rotatable,
And a return spring installed on the rotating shaft and providing a restoring force to return the first body rotated by the high speed cam to its original position
The lift amount of the valve is variably controlled in two stages of a high speed mode and a low speed mode on the basis of an engine operating condition,
The second body includes a front wall, an inner wall, and an outer wall provided on the front and both sides of the first body so as to be disposed on the front and both sides of the first body,
A pressure plate installed on both sides of the front wall and pressing the upper end of the valve by rotational movement of the second body,
And a support plate installed between the inner wall and the outer wall rear end and being held in contact with the upper end of the pivot support mechanism,
A center portion of the return spring is protruded to be supported by a front portion of the second body,
Wherein both ends of the return spring are supported by support ribs formed on both side walls of the first body. delete The method according to claim 1,
A mounting hole is formed in a front wall of the second body so that a central portion of the return spring is protruded,
Wherein the front wall is horizontally disposed at an upper end of the installation hole and has a first fixing bar
And a second fixing bar installed horizontally at a lower end of the installation hole and fixing the lower end of the return spring, wherein the upper end and the lower end of the center portion of the return spring are respectively fixed. The method according to claim 1,
Characterized in that a first and a second roller, which are rotated by the low-speed cam, are provided between each of the inner side wall and the outer side wall so as to reduce friction upon contact with the low-speed cam. The method according to any one of claims 1, 3, and 4,
Wherein the first body is provided with a rotating roller which is rotated by the high speed cam so as to reduce friction upon contact with the high speed cam,
Wherein a catching jaw is formed at a rear end of the first body so that the first and second bodies are integrally rotated by rotation of the high-speed cam during forward movement of the catching pin, . 6. The method of claim 5,
Wherein the second body is provided with a mounting portion through which the latch pin is slidably installed,
And a moving space through which the latch pin moves is formed in the mounting portion. The method according to claim 6,
Wherein the latch pin is integrally coupled to a driving pin of the driving module,
Wherein a tip of the driving pin is formed in a 'T' shape. The method according to claim 1,
The variable valve lifting device of the engine is characterized in that when the high-speed cam is provided only on the camshaft, the latching pin is operated in a low-speed, low-load state of the engine to separate the first body and the second body, Wherein the control unit performs a control operation.

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