KR101333046B1 - Continuously variable valve actuation device - Google Patents

Abstract

The present invention discloses a continuously variable valve drive capable of continuously changing the valve lift and valve open time. A continuously variable valve drive device capable of continuously varying a lift and a valve opening period of a valve, comprising: a drive shaft rotating by receiving a driving force of an engine, eccentric drive means having one end eccentrically coupled to the drive shaft, and the eccentric drive means A roller which is rotatably coupled to the other end of the roller, and a rotatably coupled to the control shaft installed in parallel with the drive shaft, one side of which is in contact with the roller and the other side of which is coupled to the elastic member, and one end of which is connected to the roller. A first link that is rotatably coupled, and a second link having one end coupled to the other end of the first link and the other end integrally coupled to the control shaft, wherein the eccentric driving means is provided on an outer circumferential surface of the drive shaft. And an eccentric link integrally coupled to the circumferential surface of the eccentric shaft and eccentrically rotatably coupled to the rotation of the drive shaft.

Engine, Valve, Variable, Rocker Arm, Flow Cam, Control Shaft, Eccentric Cam

Description

Continuously Variable Valve Drives {CONTINUOUSLY VARIABLE VALVE ACTUATION DEVICE}

The present invention relates to a continuously variable valve drive device, and more specifically, to continuously changing the valve lift (Valve Lift) and the valve opening period to achieve the optimum opening of the valve according to the rotational speed and load of the engine The present invention relates to a continuously variable valve driving apparatus for improving efficiency and improving engine performance and fuel economy.

The market requirements for power output, fuel economy, pollutant emissions, etc. of automobile engines are becoming more stringent, and are hard to meet with existing engines.

Here, the apparatus for varying the movement of the intake and exhaust valves in accordance with the rotational speed of the engine or the load conditions gives great potential for improving engine performance.

Therefore, a number of studies have been made mainly by automobile companies and parts companies for the development of the variable valve drive device.

There are two types of devices that can change the movement of the valve. One is the variable valve timing (VVT) device, which can only control the opening and closing time of the valve, and the other is the variable valve drive (VVA) device. It is a device that can change not only timing but also valve displacement and driving time.

Although the VVT device has a relatively simple structure and many successful models compared to the VVA device, the VVT device has a disadvantage in that the performance improvement effect obtained when the VVT device is installed in the engine is relatively small.

The VVA devices proposed to date can be largely divided into mechanical linkage, hydraulic lost motion, and electromagnetic.

Here, the hydraulic VVA adjusts the movement of the valve by directing the flow of oil in a direction other than the valve, in which the driving force of the cam or solenoid compresses the oil and the compression force drives the valve again. This method has the advantage that the movement of the valve can be adjusted relatively freely, while there are problems that have not yet been solved such as dynamic instability at high speed, high cost.

In addition, the electromagnetic VVA is a method of adjusting the movement of the valve by using electromagnetic force, no longer depending on the mechanical cam. Therefore, in this way, any type of valve motion can be theoretically implemented. However, while there is an advantage that various valve movements can be realized, it is difficult to precisely control the valve movement due to the limitation of the electromagnetic force and the increase of the inertia force at high speed. seating) The impact speed is too large.

Therefore, at present, the development of the mechanical VVA is mainly made, the conventional continuous variable valve drive device has a problem in that the structure is complicated, the production cost is high, the operation stability is low, and the installation space is difficult to secure.

Accordingly, the present invention is to solve the above problems, a simple structure has the effect of reducing the manufacturing cost, easy to secure the installation space, a continuous variable valve that can continuously change the opening and closing time and opening and closing time of the valve Associated with the drive.

In order to achieve the above and other objects of the present invention, in accordance with an embodiment of the present invention, in the continuous variable valve drive device capable of continuously varying the valve head and the valve opening period, the driving force of the engine is rotated A drive shaft to which one end is eccentrically coupled to the drive shaft, a roller rotatably coupled to the other end of the eccentric drive means, and a control shaft installed in parallel with the drive shaft to be rotatably coupled to one side thereof. A flow cam in contact with the roller and the other side coupled to the elastic member, a first link having one end rotatably coupled to the roller, one end coupled to the other end of the first link, and the other end connected to the control shaft. And a second link integrally coupled to each other, wherein the eccentric driving means includes an eccentric shaft integrally coupled to an outer circumferential surface of the drive shaft and an outer circumferential surface of the eccentric shaft. It provides a continuously variable valve drive device comprising an eccentric link coupled to the rotation of the drive shaft eccentrically rotatable.

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The flow cam includes a body having a curved cam surface formed on its bottom surface, and a pair of arms extending on both sides of the body and rotatably coupled to the control shaft.

The control shaft is formed with one or more receiving grooves formed along the longitudinal direction on one side of the outer circumferential surface, and a first coupling groove formed to be spaced apart from the receiving groove by a predetermined distance, and the second link is formed on the first coupling groove at a predetermined position on the upper side. A corresponding second coupling groove is formed.

A rocker arm for opening and closing the valve by pivotally contacting the bottom of the flow cam is provided, an open space part is provided in the center of the rocker arm, and the rocker arm roller is rotatably coupled to the space part. One end of the rocker arm is supported on the upper end of the valve, the other end is characterized in that the hydraulic valve clearance adjustment device is provided to automatically adjust the gap between the parts.

A valve tappet is provided to open and close the valve by contacting the bottom of the flow cam so as to be movable up and down, and the valve tappet includes a hydraulic valve gap adjusting device installed on the bottom to automatically adjust a gap between components.

A continuously variable valve drive device capable of continuously varying a valve head and a valve opening period, comprising: a cam shaft rotating by receiving a driving force of an engine, a drive cam integrally coupled to the cam shaft, and installed in parallel with the cam shaft A first rocker arm rotatably coupled to the control shaft, the first rocker arm including a first protrusion and a second protrusion integrally formed at regular intervals along the circumferential direction, and coupled to an outer circumferential surface of the control shaft and integrally at one end; A second rocker arm including a third protrusion formed, a contact portion protruding from the other end, a roller rotatably coupled to an end of the first protrusion, and one end coupled to an end of the second protrusion, and the other end thereof. And a link member coupled to an end of the third protrusion, wherein the second rocker arm has a curved cam surface formed on one side thereof. Lt; / RTI >

The first rocker arm and the second rocker arm is characterized in that the link through the link member.

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A rocker arm for opening and closing the valve by pivotally contacting the bottom of the second rocker arm is provided, an open space part is formed in the center of the rocker arm, and the rocker arm roller is rotatably coupled to the space part. One end of the rocker arm is supported on the upper end of the valve, the other end is characterized in that the hydraulic valve clearance adjusting device is provided to automatically adjust the gap between the parts.

A valve tappet is provided to open and close the valve by vertically contacting the bottom of the second rocker arm, and the valve tappet includes a hydraulic valve gap adjusting device installed on the bottom thereof to automatically adjust a gap between components. .

According to the continuously variable valve driving apparatus according to an embodiment of the present invention, it is possible to continuously change the valve head and the valve opening period can contribute to the improvement of the engine performance, fuel economy and the like of the vehicle.

In addition, the present invention has the advantage that it can be applied to both the end pivot rocker arm valve train and the direct drive valve train engine by using the principle of the variable four-section link.

Hereinafter, a preferred embodiment of a continuous variable valve driving apparatus according to a first preferred embodiment of the present invention with reference to the accompanying drawings will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent to the element may be included in the scope of the present invention.

1 is a perspective view of a continuous variable valve drive device according to a first preferred embodiment of the present invention, FIG. 2 is an exploded perspective view of the continuous variable valve drive device shown in FIG. 1, and FIG. 3 is a continuous variable valve drive device shown in FIG. 1. 4 is a schematic view showing a minimum opening and closing section of the continuous variable valve driving apparatus according to the first embodiment of the present invention, Figure 5 is a continuous variable valve driving apparatus according to the first embodiment of the present invention The operation state of.

1 to 5, the continuous variable valve driving apparatus 100 according to the first embodiment of the present invention includes a drive shaft 110 that rotates by receiving a driving force of an engine, and one end of which is eccentric to the drive shaft 110. Rotatingly coupled to the eccentric drive means 200, the roller 210 coupled to the other end of the eccentric drive means 200, and the control shaft 120 installed in parallel with the drive shaft 110 The flow cam 300, one end of which is rotatably coupled to the roller 210, one end of which is coupled to the other end of the first link 220, and the other end of the control shaft. And a second link 230 integrally coupled to 120.

The eccentric driving means 200 is an eccentric shaft 202 integrally coupled to the outer circumferential surface of the drive shaft 110, and an eccentric rotationally coupled to the circumferential surface of the eccentric shaft 202 in association with rotation of the drive shaft 110. Link 204.

The eccentric shaft 202 rotates integrally with the drive shaft 110, and as shown in FIG. 3, the center of the eccentric shaft 202 is slightly different from the center of the drive shaft 110 to be in different positions. 202 rotates eccentrically about the center of the drive shaft 110 when the drive shaft 110 rotates.

The eccentric link 204 is once coupled to the outer circumferential surface so as to freely eccentrically rotate on the outer circumferential surface of the eccentric shaft 202.

The roller 210 is rotatably coupled to the other end of the eccentric link 204, and closely supports one side of the flow cam 300 to be described later.

Therefore, the roller 210 performs translational movement in response to the rotational movement of the eccentric link 204, and the flow cam 300 rotates by rolling contact with the roller 210.

Flow cam 300 is rotatably coupled to the control shaft 120, the flow cam 300 is to press the rocker arm 400 installed on the cylinder head 600 to be described later.

The flow cam 300 includes a body 310, and a pair of arms 320 extending from both sides of the body 310 to the top and coupled to the control shaft 120, wherein a pair of arms 320 is rotatably coupled to the control shaft 120.

At this time, the body 310 of the flow cam 300 is a hexahedron shape having a predetermined thickness as a whole, curved cam surface 311 is formed on both sides of the bottom of the body 310, the cam surface 311 is a rocker which will be described later By contacting and pressing the rocker arm roller 410 of the arm 400, the opening / closing amount of the valve 500 changes.

That is, as the rocker arm roller 410 moves along the curved cam surface 311 of the flow cam 300, the rotation angle of the rocker arm 400 changes, and thus, a valve connected to one end of the rocker arm 400. The opening and closing amount of 500) changes.

Here, as shown in FIG. 2, the cam surface 311 includes a concave portion 311a formed near the upper end of the valve 500 and a convex portion 311b formed on the opposite side thereof, and includes a concave portion ( 311a) and the length and height of the convex portion 311b can be freely defined according to the design conditions such as the opening and closing amount and opening and closing time of the valve 500, and some sections of the convex portion 311b are the control shaft 120 By consisting of an arc having a center of rotation as the center, it is possible to set a section in which the valve 500 does not open despite the rotation of the flow cam 300 in the minimum opening and closing section to be described later.

The control shaft 120 is spaced apart from the drive shaft 110 and installed in parallel with the drive shaft 110, the control shaft 120 is connected to a hydraulic or electric actuator (not shown), the rotation of which depends on the operating state of the engine Controlled.

In addition, the control shaft 120 includes one or more receiving grooves 122 are formed at a predetermined depth at a predetermined interval along the longitudinal direction, and includes a first coupling groove 124 formed to be spaced apart from the receiving groove 122 by a predetermined distance. .

The first link 220 is hinged by the first hinge pin 212 so as to be freely rotatable to one end of the roller 210.

The second link 230 is hingedly coupled to the other end of the first link 220 by the second hinge pin 214, and the other end thereof is longitudinally connected to the control shaft 120. It is fixedly coupled to the receiving groove 122 formed along one or more.

Here, a second coupling groove 232 corresponding to the first coupling groove 124 is formed at a predetermined position on the upper side of the second link 230 to fasten the second link 230 to the control shaft 120. Can be fixed via 126.

In addition, more preferably, as shown in Figure 2, the first link 220 is hinged by the first hinge pin 212 to form a pair at both ends of the roller 210 spaced apart from each other, a pair The other end of the first link 220 of the one end of the second link 230 is hinged by a second hinge pin 214 so as to form a pair spaced apart from each other, the pair of second links 230 The other end is integrally coupled to the control shaft 120.

Accordingly, when the drive shaft 110 rotates, the eccentric link 204 is rotated, and when the eccentric link 204 is rotated, the roller 210 coupled to the other end of the eccentric link 204 performs a translational motion. Will push (300).

At this time, one side of the body 310 of the flow cam 300 in contact with the roller 210 is formed in a flat or curved surface, the rotation angle of the flow cam 300 to rotate in response to the translational movement of the roller 210 It is also possible to adjust.

In addition, on the other side of the roller 210, that is, the other side of the body 310 of the flow cam 300, an elastic member 330 such as a coil spring or a torsion spring is installed to move the flow cam 300 in the direction of the roller 210. Elastic support.

A rocker arm 400 is provided below the flow cam 300. One end of the rocker arm 400 is supported by the upper end of the valve 500, and the other end is a hydraulic gap that automatically compensates for the gap between the parts. The adjusting device 520 is provided.

In addition, the central portion of the rocker arm 400 is provided with a space portion 420 is opened up and down, the rocker arm roller 410 is rotatably coupled to the space portion 420 by a hinge pin 412, rocker The upper side of the arm roller 410 is supported by the cam surface 311 formed on the bottom of the flow cam 300, the cam surface 311 is supported on the upper side of the rocker arm roller 410 when the flow cam 300 is rotated Accordingly, the degree of pressurization of the valve 500 is changed, and thus the opening and closing amount of the valve 500 is changed.

Here, as shown in Figure 4, when the cam surface 310, which is supported on the upper side of the rocker arm roller 410 during the rotation of the flow cam 300 is moved between the minimum opening and closing section (A) of the valve 500 The opening / closing amount is minimum, and when moving between the maximum opening and closing sections B, the opening and closing amount of the valve 500 is maximum. At this time, the initial contact point of the cam surface 311 and the rocker arm roller 410 is determined according to the shape of the flow cam 300 in contact with the roller (210).

The operation of the continuous variable valve drive of the present invention configured as described above will be described.

When the drive shaft 110 rotates, the eccentric drive means 200, one end of which is coupled to the outer circumferential surface of the drive shaft 110, is rotated, and the roller 210 coupled to the other end of the eccentric drive means 200 makes translational motion. do.

At this time, the second link 230 is integrally attached to the control shaft 120, the position of the roller 210 is moved by the rotation of the control shaft 120, the flow cam 300 in contact with the roller 210 The initial position of the flow cam 300 in contact with the rocker arm roller 410 is changed according to the one side shape of the.

Therefore, the flow cam 300 rotates about the control shaft 120 by the roller 210. At this time, the upper side of the rocker arm roller 410 is supported by the cam surface 311 formed on the bottom surface of the flow cam 300, and the cam surface 311 supported above the rocker arm roller 410 when the flow cam 300 rotates. The degree of pressurization of the valve 500 changes as the initial position of. Therefore, the opening and closing amount of the valve 500 is to be changed.

6 is a schematic diagram showing a continuous variable valve driving apparatus according to a second embodiment of the present invention. This embodiment is substantially the same as the first embodiment of the present invention. Therefore, repeated descriptions of overlapping portions will be omitted.

Referring to FIG. 6, the continuously variable valve driving apparatus according to the second exemplary embodiment of the present invention includes a valve tappet 600 provided on a bottom of a flow cam, and a hydraulic valve gap adjusting device installed on a bottom of the valve tappet 600. 610 and a valve 500 fixed to the retainer 620 of the valve tappet 600 to move up and down by the valve tappet 600.

The upper side of the valve tappet 600 is supported by the cam surface 311 formed on the bottom surface of the flow cam 300, and when the flow cam 300 rotates, the cam surface of the flow cam 300 supported by the upper side of the valve tappet 600. According to the shape of the 311, the degree to which the valve tappet 600 pressurizes the valve 500 is changed. Therefore, the opening and closing amount of the valve 500 is to be changed.

7 is a perspective view of a continuous variable valve driving apparatus according to a third embodiment of the present invention, FIG. 8 is an exploded perspective view of the continuous variable valve driving apparatus shown in FIG. 7, and FIG. 9 is a continuous variable valve illustrated in FIG. 7. It is a schematic diagram of a drive system. This embodiment is substantially the same as the first embodiment of the present invention. Therefore, repeated descriptions of overlapping portions will be omitted.

7 to 8, the continuous variable valve driving apparatus according to the third embodiment of the present invention includes a cam shaft 700 in which a drive cam 710 is integrally coupled, and is installed in parallel with the cam shaft 700. A control shaft 120 and the outer circumferential surface of the control shaft 120 is eccentrically coupled to each other, and comprises a first protrusion 810 and a second protrusion 820 integrally spaced apart at regular intervals along the circumferential direction. A first rocker arm 800, a third protrusion 910 rotatably coupled to an outer circumferential surface of the control shaft 120, integrally formed at one end thereof, and a contact part 920 protruding from the other end thereof; A second rocker arm 900, a roller 210 rotatably coupled to an end of the first protrusion 810, one end of which is coupled to an end of the second protrusion 820, and the other end of the second rocker arm 900. 3 includes a link member 830 coupled to the end of the protrusion 910.

The drive cam 710 is integrally coupled to the cam shaft 700, and the drive cam 710 is rotated together when the cam shaft 700 rotates. The driving cam 710 includes a circular border 714 and a protrusion 712 protruding along a predetermined angle from the circular border 714.

The control shaft 120 is installed in parallel with the cam shaft 700, the first rocker arm 800 and the second rocker arm 900 is rotatably coupled to the outer peripheral surface of the control shaft 120.

The first rocker arm 800 is pivotally eccentrically coupled to the outer circumferential surface of the control shaft 120 and includes a first protrusion 810 and a second protrusion 820 integrally spaced apart from each other along the circumferential direction. . The roller 210 is rotatably coupled to an end of the first protrusion 810.

The second rocker arm 900 is rotatably coupled to the outer circumferential surface of the control shaft 120, and includes a third protrusion 910 integrally formed at one end and a contact part 920 protruding from the other end.

In addition, a curved cam surface 311 is formed on one side of the second rocker arm 900.

The roller 210 is rotatably supported on one side of the driving cam 710 and presses one side of the contact portion 920 by performing a translational movement as the driving cam 710 rotates.

One end of the connection member 830 is coupled to the end of the second protrusion 820, and the other end thereof is coupled to the end of the third protrusion 910.

Accordingly, when the cam shaft 700 is rotated, the roller 210 which is in contact with the driving cam 710 performs the translational motion. When the roller 210 translates, the first rocker arm 800 rotatably coupled to the control shaft 120 is rotated.

In addition, when the first rocker arm 800 is rotated, the second rocker arm 900 is provided at the other end of the link member 830 having one end coupled to the end of the second protrusion 820 formed on the first rocker arm 800. The end of the third protrusion 910 formed in the coupling is coupled to the link, the second rocker arm 900 also rotates.

That is, when the second rocker arm 900 is rotated, the curved cam surface 311 formed to be curved on one side of the second rocker arm 900 contacts the rocker arm roller 410 of the rocker arm 400, By pressurizing, the opening / closing amount of the valve 500 changes.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention It can be understood that it is possible.

1 is a perspective view of a continuous variable valve driving apparatus according to a first preferred embodiment of the present invention.

FIG. 2 is an exploded perspective view of the continuous variable valve drive shown in FIG. 1. FIG.

3 is a schematic view of the continuous variable valve drive shown in FIG.

Figure 4 is a schematic view showing a minimum opening and closing section of the continuous variable valve drive device according to an embodiment of the present invention.

Figure 5 is an operating state of the continuous variable valve drive device according to an embodiment of the present invention.

6 is a schematic view of a continuous variable valve drive apparatus according to a second embodiment of the present invention.

7 is a perspective view of a continuous variable valve driving apparatus according to a third embodiment of the present invention.

FIG. 8 is an exploded perspective view of the continuous variable valve driving device shown in FIG. 7; FIG.

9 is a schematic view of the continuously variable valve drive shown in FIG.

9 is a graph showing the valve opening and closing amount according to the change in the angle of the flow cam.

Description of the Related Art [0002]

100: continuous variable valve drive 500: valve

110: drive shaft 520: hydraulic valve clearance adjustment device

120: control shaft 600: cylinder head

122: receiving groove 700: camshaft

124: first coupling groove 710: drive cam

126: fastening means 712: projection

232: second coupling groove 714: circumferential edge

200: eccentric driving means 800: first rocker arm

202: eccentric shaft 810: first projection

204: eccentric link 820: second projection

210: roller 830: link member

220: first link 900: second rocker arm

230: second link 910: third protrusion

300: flow cam 920: contact portion

310: body

311: cam surface

320: arm

330: elastic member

400: rocker arm

410: rocker arm roller

Claims (11)

In the continuous variable valve drive device capable of continuously varying the head of the valve and the valve opening period, A drive shaft that receives and receives a driving force of the engine; Eccentric driving means having one end eccentrically coupled to the drive shaft; A roller rotatably coupled to the other end of the eccentric driving means; A flow cam rotatably coupled to a control shaft installed in parallel with the drive shaft, the one side of which is in contact with the roller, and the other side of which is coupled to the elastic member; A first link having one end rotatably coupled to the roller; And a second link having one end coupled to the other end of the first link and the other end integrally coupled to the control shaft. The eccentric driving means, And an eccentric link integrally coupled to the outer circumferential surface of the drive shaft, and an eccentric link coupled to the outer circumferential surface of the eccentric shaft so as to be eccentrically rotatable in conjunction with rotation of the drive shaft. delete The method according to claim 1, The flow cam includes a body having a curved cam surface formed on the bottom and a pair of arms extending on both sides of the body to be rotatably coupled to the control shaft. The method according to claim 1, The control shaft is formed with at least one receiving groove formed in the longitudinal direction on one side of the outer circumferential surface, the first coupling groove formed to be spaced apart from the receiving groove by a predetermined distance, The second link is a continuously variable valve drive device, characterized in that the second coupling groove corresponding to the first coupling groove is formed at a predetermined position on the upper side. The method according to claim 1, A rocker arm is provided to open and close the valve by pivotally contacting the bottom of the flow cam, The rocker arm is provided with an open space in the center portion, the rocker arm roller is rotatably coupled to the space portion, One end of the rocker arm is supported on the upper end of the valve, the other end of the variable valve drive device, characterized in that the hydraulic valve gap adjusting device is provided to automatically adjust the gap between the parts. The method according to claim 1, A valve tappet is provided to open and close the valve by contacting the bottom of the flow cam so as to be movable up and down, and the valve tappet includes a hydraulic valve gap adjusting device installed on the bottom to automatically adjust the gap between the parts. Continuously variable valve drive. In the continuous variable valve drive device capable of continuously varying the head of the valve and the valve opening period, A cam shaft which receives and rotates the driving force of the engine; A drive cam integrally coupled to the camshaft; A first rocker arm eccentrically rotatably coupled to a control shaft installed in parallel with the cam shaft, the first rocker arm including a first protrusion and a second protrusion integrally spaced apart from each other along a circumferential direction; A second rocker arm coupled to an outer circumferential surface of the control shaft and including a third protrusion integrally formed at one end and a contact portion protruding at the other end; A roller rotatably coupled to an end of the first protrusion; And One end coupled to an end of the second protrusion, and the other end includes a link member coupled to the end of the third protrusion, The second rocker arm is a continuous variable valve drive, characterized in that the curved cam surface is formed on one side. The method of claim 7, And the first rocker arm and the second rocker arm are linked by the link member. delete The method of claim 7, A rocker arm is provided to open and close the valve by pivotally contacting the bottom of the second rocker arm. An open space is formed in the center of the rocker arm, and the rocker arm roller is rotatably coupled to the space. One end of the rocker arm is supported on the upper end of the valve, the other end of the variable valve drive device, characterized in that the hydraulic valve gap adjusting device is provided to automatically adjust the gap between the parts. The method of claim 7, A valve tappet is provided to open and close the valve by vertically contacting the bottom of the second rocker arm, and the valve tappet includes a hydraulic valve gap adjusting device installed on the bottom to automatically adjust a gap between components. Continuously variable valve drive, characterized in that.

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