KR20090065359A - Variable vavle lift apparatus - Google Patents

Abstract

A variable valve lift apparatus is provided to minimize design change of the cylinder head because the variable valve lift is implemented without the location shift of cam-shaft. A variable valve lift apparatus(1) comprises a rocker arm(10), and an input cam(50), a slot-like rocker arm transferring guide(20), and a variable link(30). In one side of the rocker arm, a rocker arm roller(14) is equipped. The rocker arm shaft(15) is equipped in the lateral direction of the rocker arm roller. In the rocker arm shaft, the rocker arm body(12) which is curve-cut and is extended is downwards equipped. The rocker arm roller and rocker arm shaft are connected the rocker arm body. In the bottom part of the rocker arm body, the swing arm roller contact unit(18) which is curve-cut in the rocker arm direction of roller is equipped. In the bendable portion of the swing arm roller contact unit, it digs with the rocker arm output, protruded to the opposite direction(16) is equipped. In the rocker arm transferring guide, the rocker arm shaft is adopted. The rocker arm transferring guide the rocker arm shaft guides the swing movement to the designated angle. The variable link is equipped in the lateral direction of the rocker arm transferring guide. One side of the variable link is turned and combined with the rocker arm shaft.

Description

Variable Valve Lift Device {VARIABLE VAVLE LIFT APPARATUS}

The present invention relates to a variable valve lift apparatus, and more particularly, to a variable valve lift apparatus in which a center pivot is formed.

Generally, there are various valve mechanisms for opening and closing valves of a vehicle engine according to the structure and type thereof. The present invention is applied to an overhead camshaft valve mechanism in which a camshaft is installed in a cylinder head and the cam moves the rocker arm directly. Will be.

However, the above technology has a problem that the valve lift amount can not be adjusted according to the high power of the engine because it has a constant valve lift amount regardless of the engine speed.

Therefore, in order to overcome such a problem, at present, as a representative technique for improving the efficiency of gasoline engines, VVT (Variable Valve Timing) and VVL (which can adjust the valve overlap period by adjusting the timing of the cam opening and closing and the height of the lift) Variable Valve Lift) technology. This technology not only improves engine power, but also reduces NOx by internal EGR and improves fuel economy by reducing pumping losses.

However, in the related art, a technique of adjusting the valve lift amount by varying the camshaft has been disclosed. However, according to this technique, the design of the cylinder head is inevitable due to the change of the camshaft, and the position of the camshaft is variable. Frequent changes in the train also had problems with durability. In addition, the prior art has a problem that the structure is complicated and the number of assembly labor is high, resulting in an increase in cost.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a variable valve lift apparatus having a simple structure having a rocker arm shaft of a center pivot fluorite and having a variable link for varying the rocker arm shaft.

The present invention, the valve is provided on one side, the hydraulic valve gap adjusting device is provided on the other side, the swing arm roller is provided at the center, and includes a swing arm swinging around the swing arm roller, the swing arm A valve lift device provided at an upper portion of the valve lift device for driving the swing arm, the rocker arm roller being provided at one side, the rocker arm shaft being provided at the side of the rocker arm roller, and connecting the rocker arm roller and the rocker arm axis. The rocker arm body is bent downward from the rocker arm axis and provided with a swing arm roller contact portion bent in the rocker arm roller direction at the lower end of the rocker arm body, and at the bent portion of the swing arm roller contact portion. A rocker arm with a rocker arm output cam projecting in the opposite direction and a position surrounded by the rocker arm roller, rocker arm body and swing arm contacts An input cam driven in contact with the rocker arm roller and the rocker arm body, the rocker arm shaft is accommodated, and the rocker arm movement guide having a rocker arm shaft for guiding swing movement at a predetermined angle; It is provided on the side of the rocker arm movement guide, one side is rotatably coupled with the rocker arm shaft, the other side is characterized in that it comprises a variable link provided with an eccentric cam.

In addition, the swing movement trajectory of the rocker arm axis is characterized in that the circular arc around the swing arm roller.

In addition, the rocker arm is provided in the lateral direction of the movement guide, one side is rotatably coupled with the rocker arm axis, the other side is provided with a first variable link and a hinge axis of the first variable link is rotatably coupled A second variable link is provided.

In addition, the rocker arm is provided in the upper direction of the movement guide, one side is rotatably coupled with the rocker arm shaft, the other side is characterized in that the variable link provided with a pivot shaft.

In addition, one side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable guide link is rotatably coupled with the swing arm roller shaft, the rocker arm shaft swings at a predetermined angle by the rotation of the swing arm roller shaft It is characterized by.

In addition, one side is rotatably coupled with the rocker arm shaft, the other side is provided with a guide link is rotatably coupled with the swing arm roller shaft, provided on the side of the rocker arm movement guide, one side is rotated with the rocker arm shaft Is coupled, the other side is characterized in that the variable link is provided with an eccentric cam.

In addition, one side is rotatably coupled with the rocker arm shaft, the other side is provided with a guide link is rotatably coupled with the swing arm roller shaft, provided on the side of the rocker arm movement guide, one side is rotated with the rocker arm shaft It is coupled, the other side is characterized in that the variable link is provided with a groove for receiving the eccentric cam.

In addition, the one side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable link having a tooth formed on the upper surface, it is characterized in that the gear wheel is engaged with the tooth to rotate.

In addition, the other upper surface of the variable link is characterized in that formed in a curved surface according to the arc trajectory around the swing arm roller.

The rocker arm shaft may further include a return spring made of a torsion spring.

According to the present invention, the variable valve lift can be implemented without changing the camshaft position, thereby minimizing the design change of the cylinder head, without changing the valve train, and the camshaft can be positioned at the center of the mechanism, thereby increasing the engine height. You can prevent it.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the variable valve lift apparatus according to the present invention.

<First Embodiment>

With reference to FIG. 1, the structure of 1st Embodiment of the variable valve lift apparatus 1 which concerns on this invention is demonstrated.

First, a valve 90 is provided at one side, a hydraulic valve gap adjusting device 95 is provided at the other side, and a swing arm 80 having a swing arm roller 84 at the center thereof is the swing arm roller 84. Since the swing drive around the same as the conventional technology, a detailed description thereof will be omitted.

The variable valve lift apparatus 1 according to the present invention is provided on the swing arm 80 configured as described above. The variable valve lift apparatus 1 according to the present invention is largely composed of a rocker arm 10, a rocker arm movement guide 20, a variable link 30, a return spring 40, and an input cam 50.

First, the rocker arm 10 applied to the present invention is provided with a rocker arm roller 14 on one side, and the rocker arm shaft 15 is provided on the side of the rocker arm roller 14. In the example shown in FIG. 1, the rocker arm shaft 15 is located on the upper right side with respect to the rocker arm roller 14, but this can be changed depending on the setting of the valve lift amount and the layout of the peripheral mechanism.

The rocker arm roller 14 and rocker arm shaft 15 are mounted to the rocker arm body 12. The rocker arm body 12 is formed by mounting the rocker arm roller 14 at one end and being bent downward from the rocker arm shaft 15 while being connected to the rocker arm shaft 15. The portion which is bent downward and extended is bent to surround the input cam 50, which will be described later, and the cam contact portion 13 is formed on the inner surface thereof to be in contact with the input cam 50.

In addition, at the lower end of the rocker arm body 12 formed as described above, a swing arm roller contact portion 18 bent and extended in the direction of the rocker arm roller 14 is formed. Therefore, the rocker arm 10 has a substantially inverted 'C' shape. In addition, the swing arm roller contact portion 18 is a portion in contact with the swing arm roller 84, it is preferably bent corresponding to the sliding surface of the swing arm roller (84).

At the bent portion of the swing arm roller contact portion 18, a rocker arm output cam 16 is formed which protrudes in the opposite direction (the right direction in FIG. 1) to the swing arm roller contact portion 18. The rocker arm output cam 16 is a part which directly lifts the valve 90 in contact with the swing arm 80, and may be designed by varying its protruding amount according to the setting of the valve lift amount.

As described above, the inside of the rocker arm 10 having a substantially inverted 'C' shape has an input cam at a position surrounded by the rocker arm roller 14, the rocker arm body 12, and the swing arm contact portion 18. 50). The input cam 50 is rotatably fixed to the input cam shaft 55 in the cylinder head (not shown), and contacts the cam contact 13 inside the rocker arm roller 14 and the rocker arm body 12. To transfer the driving force in driving the valve lift.

Meanwhile, the rocker arm shaft 15 is accommodated in the rocker arm movement guide 20 and is also rotatably coupled to one side of the variable link 30. The rocker arm movement guide 20 is formed in a long hole shape and is preferably formed in the cylinder head, and the rocker arm axis 15 moves within the long hole range of the rocker arm movement guide 20. It is guiding. The movement guide in the rocker arm movement guide 20 will be described in the section describing the operation of the variable valve lift apparatus according to the present invention.

In addition, the rocker arm shaft 15 is rotationally coupled with the variable link 30, the variable link 30 is provided in the lateral direction (ie, in the longitudinal direction of the long hole) of the rocker arm movement guide 20, One side is rotatably coupled with the rocker arm shaft 15, the other side is provided with an eccentric cam (32). The eccentric cam 32 is a shaft having a circular cross section. The eccentric cam 32 has an eccentric cam rotation shaft 34 which is eccentric in its rotational axis. ) Moves within the rocker arm movement guide 20.

In addition to the above configuration, the rocker arm shaft 15 is further provided with a return spring 40 in the form of a torsion spring. The return spring 40 is returned to its original position when the rocker arm shaft 15 is moved in one direction by the eccentric rotation of the variable link 30, and then the external force for rotating the eccentric cam 32 is removed. To come.

Next, the operation of the first embodiment of the variable valve lift apparatus according to the present invention will be described.

2 shows the operation trajectory of the first embodiment of the variable valve lift apparatus 1 according to the present invention, and FIG. 3 is an operation diagram of the first embodiment of the variable valve lift apparatus according to the present invention. The reference position in the high lift drive, (b) shows the maximum lift position in the high lift drive, (c) the reference position in the low lift drive, and (d) shows the maximum lift position in the low lift drive. In addition, in FIG. 2, the description of the reference numeral is omitted in order to clarify the operation trajectory.

As shown in FIG. 2, the rocker arm axis 15 is moved within the rocker arm movement guide 20, the trajectory of which is a circular arc around the swing arm roller 84 of the swing arm 80. Following the trajectory of T1. Therefore, the rocker arm axis 15 is limited to the movement within the range of the rocker arm movement guide 20, so that the position of the rocker arm roller 14 and the rocker arm body 12 as shown in FIG. In addition, this also changes the position of the rocker arm output cam 16 which substantially lifts the valve 90 so as to change the interval at which the swing arm 80 is pressed, thereby implementing a variable valve lift. Will be. That is, since the trajectory of the rocker arm output cam 16 moves in accordance with the trajectory indicated by the symbol Th during the high lift driving, the swing arm 80 is pressed deeply and the rocker arm output cam 16 during the low lift driving. Since the trajectory of is moved in accordance with the trajectory indicated by the symbol Tl, the swing arm 80 is pressed lightly.

With reference to FIG. 3, the high lift drive and the low lift drive of the variable valve lift apparatus 1 which concerns on this invention are demonstrated.

FIG. 3 (a) shows a state where the reference position, ie, the rocker arm output cam 16, does not touch the swing arm 80 during the high lift drive of the variable valve lift apparatus 1 according to the present invention. b) shows a state in which the maximum lift position during the high lift drive of the variable valve lift apparatus according to the present invention, that is, the rocker arm output cam 16 depresses the swing arm 80 as much as possible. As shown in FIGS. 3A and 3B, with the rocker arm axis 15 positioned to the right of the rocker arm movement guide 20, the input cam 50 is eccentrically rotated to allow the rocker to rotate. The rocker arm 10 is operated about the rocker arm axis 15 by contacting the arm roller 14 and the cam contact 16. The rocker arm 10 rotates about the rocker arm axis 15 to realize high lift driving at the height of h1 shown in FIGS. 3A and 3B.

Next, FIG. 3 (c) shows a state in which the reference position during the low lift driving of the variable valve lift apparatus according to the present invention, that is, the rocker arm output cam 16 does not touch the swing arm 80, and FIG. d) shows the maximum lift position at the time of low lift drive of the variable valve lift apparatus which concerns on this invention, ie, the rocker arm output cam 16 pressed the swing arm 80 as much as possible in low lift drive. As shown in FIGS. 3C and 3D, with the rocker arm axis 15 positioned on the left side of the rocker arm movement guide 20, the input cam 50 is eccentrically rotated to allow the rocker to rotate. The rocker arm 10 is operated about the rocker arm axis 15 by contacting the arm roller 14 and the cam contact 16. The rocker arm 10 rotates about the rocker arm axis 15, so that low lift driving at the height of h2 shown in Figs. 3C and 3D is realized.

As described above, according to the present invention, the variable valve lift can be implemented while the camshaft (input camshaft 55) is fixed, thereby minimizing the design change of the cylinder head, there is no change in the valve train, and the camshaft is Since it can always be located in the center of a mechanism, an increase in engine height can be prevented.

<2nd embodiment>

4 is a side view of the second embodiment of the variable valve lift apparatus according to the present invention. In the second embodiment shown in Fig. 4, a portion of the variable link 30 of the first embodiment is changed, and other portions are the same, and thus detailed description thereof will be omitted.

As shown in FIG. 4, the rocker arm moving guide 20 is provided in a lateral direction, is rotatably coupled to the rocker arm shaft 15 at one side, and the first variable having a hinge shaft 320 at the other side. A link 300 and a second variable link 330 is rotatably coupled with the hinge shaft 320 of the first variable link 300, and the second variable link 330 is the first variable link ( It is arranged to form an angle of about 90 with the 300, the other side is provided with a pivot shaft 340. Therefore, the second variable link 330 pivotally drives in the P1 direction to move the first variable link in the D1 direction so that the rocker arm shaft 15 connected to one side of the first variable link is guided by the rocker arm movement guide. It moves inside, and the same effect as the said 1st Embodiment can be acquired.

Third Embodiment

5 is a side view of a third embodiment of a variable valve lift apparatus according to the present invention. In the third embodiment shown in FIG. 5, the portion of the variable link 30 of the first embodiment is changed, and other parts are the same. Therefore, detailed description thereof will be omitted.

As shown in Figure 5, the rocker arm moving guide 20 is provided in the upper direction, one side is rotatably coupled with the rocker arm shaft 15, the other side is a variable link (with a pivot shaft 321 is provided ( 301 is applied. Therefore, when the variable link 301 is pivotally driven in the P2 direction, the rocker arm shaft 15 connected to one side of the variable link 301 moves in the rocker arm movement guide 20, so that the first The same effects as in the embodiment can be obtained.

<4th embodiment>

6 is a side view of a fourth embodiment of a variable valve lift apparatus according to the present invention. In the fourth embodiment shown in FIG. 6, a portion of the variable link 30 and the rocker arm movement guide 20 of the first embodiment are changed, and other portions are the same, and thus detailed description thereof will be omitted.

As described in the first embodiment, since the trajectory of the rocker arm shaft 15 of the variable valve lift apparatus according to the present invention follows the trajectory of an arc around the swing arm roller 84 of the swing arm 80. 6, a variable guide link 302 rotatably coupled with the rocker arm shaft 15 on one side and rotatably coupled with the swing arm roller 84 shaft on the other side may be provided. As described above, the variable guide link 302 is rotatably coupled with the rocker arm shaft 15 on one side, and rotatably coupled with the swing arm roller 84 shaft on the other side of the rocker arm 10. It is formed to be bent in a shape corresponding to, that is, approximately 'C' shape. Further, when the swing arm roller 84 is pivotally driven in the P3 direction, the rocker arm shaft 15 moves in the D3 direction, and thus the same effects as in the first embodiment can be obtained.

<Fifth Embodiment>

7 shows a side view of a fifth embodiment of a variable valve lift apparatus according to the present invention. In the fifth embodiment shown in FIG. 7, the rocker arm movement guide 20 of the first embodiment is changed, and other parts are the same, and detailed description thereof will be omitted.

The fifth embodiment is a combination of the first embodiment and the fourth embodiment, the guide is rotatably coupled with the rocker arm shaft 15 on one side, and rotatably coupled with the rotation shaft of the swing arm roller 84 on the other side. Link 303 is provided. In addition, as in the first embodiment, a variable link 30 is rotatably coupled to the rocker arm shaft 15 on one side and provided with an eccentric cam 32 on the other side. Therefore, when the eccentric rotation by the variable link 30, the rocker arm axis 15 is moved by the guide link 303 in accordance with the circular arc trajectory around the swing arm roller 84, The same effects as in the first embodiment can be obtained.

Sixth Embodiment

8 is a side view of a sixth embodiment of a variable valve lift apparatus according to the present invention. Since the sixth embodiment shown in FIG. 8 changes the portion of the variable link 30 and the rocker arm movement guide 20 of the first embodiment, detailed description thereof will be omitted. In addition, since the rocker arm movement guide 20 is the same as the fifth embodiment, detailed description thereof will be omitted.

In the sixth embodiment, the variable link 304 is rotatably coupled with the rocker arm shaft 15 on one side and a groove 331 for receiving the eccentric cam 32 on the other side. Therefore, when the eccentric cam 32 is rotated as in the first embodiment or the fifth embodiment, the rocker arm shaft 15 moves along an arc trajectory around the swing arm roller 84. The same effects as in the first embodiment can be obtained.

Seventh Embodiment

9 is a side view of a seventh embodiment of a variable valve lift apparatus according to the present invention. Since the seventh embodiment shown in FIG. 9 changes the portion of the variable link 30 and the rocker arm movement guide 20 of the first embodiment, detailed description thereof will be omitted. In addition, since the rocker arm movement guide 20 is the same as that of the fifth and sixth embodiments, detailed description thereof will be omitted.

A seventh embodiment is provided with a variable link 305 is rotatably coupled with the rocker arm shaft 15 on one side, the other side is provided with a variable link 305 is formed with a tooth 355, the gear wheel 340 is engaged with the tooth 355 to rotate. ) Is provided. In addition, the other upper surface of the variable link 305 is formed in a curved surface according to the arc trajectory (T1) around the swing arm roller 84, the rocker arm shaft 15 when the gear wheel rotates in the P4 direction ) Moves along the circular arc trajectory T1 around the swing arm roller 84, whereby the same effect as in the first embodiment can be obtained.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art are appropriately within the scope described in the claims of the present invention. Changes will be possible.

1 is a side view of a first embodiment of a variable valve lift apparatus according to the present invention.

2 is a side view showing an operation trajectory of the first embodiment of the variable valve lift apparatus according to the present invention.

Figure 3 is an operation of the first embodiment of the variable valve lift apparatus according to the present invention, (a) is the reference position during high lift drive, (b) the maximum lift position during high lift drive, (c) is low Reference position in the lift drive, (d) is a side view showing the maximum lift position in the low lift drive.

4 is a side view of a second embodiment of a variable valve lift apparatus according to the present invention.

5 is a side view of a third embodiment of a variable valve lift apparatus according to the present invention.

6 is a side view of a fourth embodiment of a variable valve lift apparatus according to the present invention.

7 is a side view of a fifth embodiment of a variable valve lift apparatus according to the present invention.

8 is a side view of a sixth embodiment of a variable valve lift apparatus according to the present invention.

9 is a side view of a seventh embodiment of a variable valve lift apparatus according to the present invention.

<Description of the code>

1: variable valve lift apparatus 10: rocker arm

12 rocker arm body 13 cam contact

14 rocker arm roller 15 rocker arm axis

16 rocker arm output cam 18 swing arm roller contact portion

20: rocker arm movement guide 30: variable link

32: eccentric cam 34: eccentric cam rotation axis

40: return spring 50: input cam

55 input camshaft 80 swing arm

84: swing arm roller 90: valve

95: hydraulic valve gap adjusting device 300: first variable link

301: variable link 302: variable guide link

303: guide link 304: variable link

305: variable link 320: hinge axis

321: pivot axis 330: second variable link

331: groove 340: pivot axis

355: Cogwheel 360: Cogwheel

Claims (10)

A valve is provided at one side, a hydraulic valve clearance adjusting device is provided at the other side, a swing arm roller is provided at the center, and includes a swing arm that swings around the swing arm roller, and is provided on an upper portion of the swing arm. A valve lift device for driving the swing arm, A rocker arm roller is provided at one side, and a rocker arm shaft is provided at the side of the rocker arm roller, and the rocker arm body is bent downward from the rocker arm axis and extends while connecting the rocker arm roller and the rocker arm axis. A rocker arm having a swing arm roller contact portion bent in the rocker arm roller direction at a lower end of the rocker arm body, and having a rocker arm output cam projecting in an opposite direction from the bent portion of the swing arm roller contact portion; An input cam provided at a position surrounded by the rocker arm roller, the rocker arm body and the swing arm contact portion, the input cam being driven in contact with the rocker arm roller and the rocker arm body; A rocker arm movement guide having a rocker arm shaft, the rocker arm shaft guides a swing movement at a predetermined angle; It is provided in the lateral direction of the rocker arm movement guide, one side is rotatably coupled with the rocker arm shaft, the other side variable link provided with an eccentric cam, Variable valve lift apparatus comprising a. The method according to claim 1, The swing movement trajectory of the rocker arm shaft is a variable valve lift apparatus, characterized in that the circular arc around the swing arm roller. The method according to claim 2, A first variable link provided at a side of the rocker arm movement guide, one side of which is rotatably coupled with the rocker arm shaft, and the other side of which is provided with a hinge shaft; And a second variable link rotatably coupled with the hinge axis of the first variable link. The method according to claim 2, It is provided in the upper direction of the rocker arm movement guide, the variable valve lift device, characterized in that the variable link is rotatably coupled with the rocker arm shaft, the other side is provided with a pivot shaft. The method according to claim 2, One side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable guide link is rotatably coupled with the swing arm roller shaft, And the rocker arm shaft swings at a predetermined angle by the rotation of the swing arm roller shaft. The method according to claim 2, One side is rotatably coupled with the rocker arm shaft, the other side is provided with a guide link rotationally coupled with the swing arm roller shaft, It is provided in the lateral direction of the rocker arm movement guide, the variable valve lift device, characterized in that the one side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable link provided with an eccentric cam. The method according to claim 2, One side is rotatably coupled with the rocker arm shaft, the other side is provided with a guide link rotationally coupled with the swing arm roller shaft, The variable valve lift apparatus is provided in the lateral direction of the rocker arm movement guide, one side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable link groove is formed for receiving the eccentric cam. The method according to claim 2, One side is rotatably coupled with the rocker arm shaft, the other side is provided with a variable link with the teeth formed, Variable valve lift apparatus characterized in that the gear wheel is provided to rotate in engagement with the tooth. The method according to claim 8, The other side surface of the variable link is a variable valve lift apparatus, characterized in that formed in the curved surface according to the arc trajectory around the swing arm roller. The method according to any one of claims 1 to 3, The rocker arm shaft is a variable valve lift device, characterized in that further provided with a return spring made of a torsion spring.

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