KR101465636B1 - Variable valve lift actuator of engine - Google Patents

Abstract

The present invention relates to a variable valve lift actuator of an engine, including a first body rotating within a predetermined angle range by rotation movement of a high-speed cam connected to a cam shaft; a second body connected to or disconnected from the first body and rotating within a predetermined angle range by rotation movement of a low-speed cam when being disconnected from the first body; a latching pin coming in and out toward the front of the first body to connect or disconnect the first body to or from the second body; and an operation unit for operating the latching pin. Since the first and second bodies are connected to or disconnected from each other by the latching pin, it is possible to variably control the lift amount of the valve in two stages, i.e., a low-speed mode and a high-speed mode, by the rotation movement of the high or low-speed cam.

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.

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)

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.

Therefore, there is a need for a technique for deactivating some cylinders in a low-speed and low-load state of the engine and improving the efficiency of the engine by activating all the cylinders in a high-speed and high-load state.

In the prior art, hydraulic pressure is used to stop the valve or to control the valve in two stages. However, the structure of the variable valve lift mechanism is complicated and the workability is lowered.

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.

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.

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, A second body connected to or separated from the first body and rotated in a predetermined angular range by a rotational motion of a low speed cam coupled to the camshaft when separated from the first body, A latching pin coupled to the front body in a manner operable to protrude toward and away from the body, and an operation unit for projecting and retracting the latching pin to perform a two-stage variable control operation of a high speed mode and a low speed mode, do.

A coupling space is formed in the first body so that the latching pin can be protruded and retracted, and a latching spring is provided in the coupling space to provide a restoring force to the latching pin.

A pair of flange portions are formed on both sides of the first body, and an engaging pin for rotatably coupling the first body and the second body is coupled to each flange portion.

The second body may include 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 support plate which is installed between the inner side wall and the rear end of the outer wall and is held in contact with the upper end of the pivot support mechanism, and a roller which is installed between the inner side wall and the outer side wall and rotates in contact with the low speed cam .

And the front wall is formed with an insertion hole into which the tip of the latch pin is inserted during the projecting operation of the latch pin.

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, the lift amount of the valve can be controlled in two stages of the high speed mode and the low speed mode by connecting or disconnecting the first body and the second body using the catching pin and rotating the high speed cam or the low speed cam .

Further, according to the present invention, since the stoppage control and the two-step variable control of the valve are performed in a mechanical manner, the effect of temperature can be eliminated and the lift amount of the valve can be precisely controlled.

1 is a perspective view of a variable valve lift apparatus of an engine according to a preferred 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 perspective view of a carrier equipped with the variable valve lifting device of the engine shown in Fig. 1, Fig.
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

[First Embodiment]

FIG. 1 is a perspective view of a variable valve lift apparatus of an engine according to a preferred 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 based on whether or not the first body 20 is connected to the first body 20 and the second body 30 for holding the valve 14 in a closed state, A latching pin 40 and an operation unit 50 for projecting and retracting the latching pin 40 to be coupled to and detached from the first body 20 so as to connect or disconnect the body 30.

In addition, the variable valve lift apparatus of the engine according to the preferred embodiment of the present invention returns the first body 20 installed at the lower portion of the first body 20 and rotated by the cam 11 to the original position, And a return spring 15 for providing a restoring force to cause the resilient force to be applied.

The first body 20 is formed in a substantially rectangular parallelepiped shape and a coupling space 21 through which the latching pin 40 is coupled may be formed in the first body 20.

A latching spring 22 for providing a restoring force to the latching pin 40 may be provided in the coupling space 21 inside the first body 20. [

The latching spring 22 may be manufactured with an inner diameter corresponding to the outer diameter of the latching pin 40.

A pair of flange portions 23 are formed at both the rear ends of the first body 20 and a coupling hole in which the coupling pins 24 are coupled to the respective flange portions 23 may be formed.

The coupling pin 24 may be coupled to the coupling hole formed in the flange portion 23 of the first body 20 and the coupling hole formed in the inner wall 32 of the second body 30 described below.

Accordingly, the first body 20 can be hingedly rotated around the engaging pin 24.

The second body 30 may include a front wall 31 and both side walls so as to be substantially U-shaped when viewed from above so as to be disposed on the front and both sides of the first body 20.

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 pressing plate 34 is installed horizontally along the longitudinal direction of the second body 20 and presses the upper end of the valve 14 during the rotational movement of the second body 20 so as to move the valve 14 It can be opened and closed.

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).

A support plate 35 may be formed between the inner wall 32 of the second body 30 and the rear end of the outer wall 33 so as to be held 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. [

In addition, an insertion hole 36 may be formed in the front wall 31 of the second body 30 to insert the latching pin 40 in a forward direction.

The latching pin 40 is formed in a substantially circular or elliptical cylindrical shape in cross section and connected to the engagement space 21 of the first body 20 by the extension operation of the operation unit 50, Can be moved toward the front of the main body 20.

The outer circumferential surface of the latching pin 40 may be formed with a tapered surface 41 for supporting the rear end of the latching spring 22 so as to move backward by the restoring force of the latching spring 22. [

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

For example, when the control signal is applied in a state where the tip of the solenoid pin 51 is in contact with the rear end of the latch pin 40, the solenoid generates a magnetic field in the coil wound therein to move the solenoid pin 51 forward So that the latching pin 40 can be moved to move.

3 is a perspective view of a carrier equipped 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 carrier 60 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 operation state in which the valve is opened and closed by the rotational motion of the cam in the variable valve lift apparatus of the engine.

In Fig. 4, an operation state for stopping the valve is shown.

The variable valve lifting device of the engine according to the first embodiment of the present invention drives the operation unit 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 distal end of the first latching pin 40 is inserted into the insertion hole 36 of the second body 30 while being protruded forward of the first body 20 so that the first body 20 and the second body 30 ).

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.

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, the operation unit 50 is controlled by the control signal of the electronic control unit, The power supplied to the power source is cut off.

Thus, the latching pin 40 is moved backward by the restoring force of the latching spring 22, as shown in Fig.

At this time, as the first latching pin 40 moves backward and is accommodated in the first body 20, 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, the variable valve lifter of the engine according to the first embodiment of the present invention is configured such that the second body 30, which is in contact with the upper end of the valve 14, is fixed even when the cam 11 rotates, Lt; / RTI >

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.

[Second Embodiment]

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 for 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 a pair of rollers 37 that rotate in contact with the low-speed cam 13 in a low-speed and low-load state of the engine.

Each roller 37 may be rotatably installed on a fixing pin 38 that is inserted through 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 operational state of the variable valve lift apparatus of the engine operating in the low speed mode in the low speed and low load conditions of the engine.

9 shows the operating state of the variable valve lift device of the engine operating in the high-speed, high-load, high-speed mode of the engine.

The variable valve lifting device of the engine according to the second embodiment of the present invention maintains the state in which the latching pin 40 is accommodated in the first body 20, So that the first body 20 and the second body 30 are separated from each other.

At this time, the roller 37 provided on the second body 30 comes into contact with the low-speed cam 13 provided on the camshaft 10 and rotates.

Then, the second body 30 is hingedly rotated about the pivot support mechanism 16 by the rotational motion of the low-speed cam 13, thereby opening and closing the valve 14.

On the other hand, in the variable valve lift apparatus of the engine according to the second embodiment of the present invention, when the engine is in a high speed and high load state, as shown in FIG. 9, the variable valve lift apparatus of the present invention drives the operation unit 50 to move the catch pin 40 forward .

The distal end of the first latching pin 40 is inserted into the insertion hole 36 of the second body 30 while being protruded forward of the first body 20 so that the first body 20 and the second body 30 ).

At this time, the first body 20 contacts the high-speed cam 12 provided on the camshaft 10 and rotates.

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 of the valve 14 by the low speed cam 13, the amount of air supplied to the cylinder of the engine Flow rate increases.

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.

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 reference to 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: engaging space 22: latching spring
23: flange portion 24: engaging pin
30: second body 31: front wall
32: inner side wall 33: outer side wall
34: pressure plate 35: support plate
36: insertion hole 37: roller
38: Fixing pin 40: Retaining pin
50: operation unit 51: solenoid pin
60: Carrier

Claims (5)

A first body that rotates within a predetermined angular range by rotational movement of a high-speed cam coupled to the camshaft,
A second body connected to or separated from the first body and rotated in a predetermined angular range by a rotational motion of a low speed cam coupled to the cam shaft when the first body is separated from the first body,
A catching pin operatively coupled to and detached from the first body to connect or disconnect the first body and the second body, and
And an operation unit for causing the latching pin to protrude and retreat,
A pair of flange portions are respectively formed on both rear ends of the first body,
Each flange portion is provided with a coupling pin for rotatably coupling the first body and the second body,
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,
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,
And a roller installed between the inner side wall and the outer side wall and rotating in contact with the low speed cam
And performs a two-stage variable control operation of a high-speed mode and a low-speed mode on the basis of an operating condition of the engine. The method according to claim 1,
Wherein a coupling space is formed in the first body so that the latching pin can be protruded and retracted,
Wherein a latching spring for providing a restoring force to the latching pin is installed in the engagement space. delete delete The method according to claim 1,
Wherein the front wall is formed with an insertion hole into which the tip of the latch pin is inserted during the projecting operation of the latch pin.

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