KR101219339B1 - Cylinder deactivation for vehicle - Google Patents

Abstract

The present invention relates to a cylinder stop device for a vehicle, and more particularly, it consists of an end pivot structure that can control two valves at the same time, during zero lift, the rocker arm and the middle arm are separated to move two rotational force by the general cam Since there is no lift because it is not transmitted to the valve, the rocker arm and the middle arm move together by the locking pin during normal lift, so that the rotational force by the general cam is transmitted to the valve in the vertical motion, thereby improving the efficiency according to the engine conditions. Rather, it relates to a cylinder stop device for a vehicle that enables easy processing of each part, ensures operability, and minimizes the number of parts to ensure excellent assembly and cost reduction.

To this end, the present invention and the general cam and the zero lift cam is fixed to the camshaft parallel to each other; A middle arm pressurized by the rotation of the general cam; A rocker arm having a cutout formed in the middle to insert the middle arm, and having a rear end hinged to the hinge axis coaxially with the middle arm; Return means mounted to a lower portion of the rocker arm to support the middle arm; A pressing end formed at the front end of the rocker arm to press the upper end of the valve; It provides a cylinder stop device for a vehicle comprising a; a fastening means for moving the middle arm and the rocker arm integrally during the normal lift.

Zero lift, rocker arm, middle arm

Description

Cylinder deactivation device for vehicles {Cylinder deactivation for vehicle}

1 is a perspective view showing an embodiment of a vehicle cylinder stop device according to the present invention,

FIG. 2 is an exploded perspective view of FIG. 1;

Figure 3 is a side view showing the operating state of the cylinder stop device for a vehicle during a normal lift,

Figure 4 is a cross-sectional view showing the operating state of the locking pin during the normal lift,

Figure 5 is a side view showing the operating state of the vehicle cylinder stop device at zero lift,

6 is a cross-sectional view showing an operating state of the locking pin at zero lift.

<Description of the symbols for the main parts of the drawings>

10: camshaft 11: general cam

11a: cam protrusion 12: zero lift cam

13 valve 14 middle arm

14a: step 15: rocker arm

15a: zero lift pad 15b: push end

15c: Spring Mount 14 ', 15', 15 ": Through Hole

16: cutting hole 17: hinge axis

17a: hollow part 17b: hydraulic supply part

18: spring 19: first return spring

20: Tan district 21: Locking pin

21a: large diameter 21b: small diameter

21c: Euro groove 22: Second return spring

23: return tube

The present invention relates to a cylinder stop device for a vehicle, and more particularly, it consists of an end pivot structure that can control two valves at the same time, during zero lift, the rocker arm and the middle arm are separated to move two rotational force by the general cam Since there is no lift because it is not transmitted to the valve, the rocker arm and the middle arm move together by the locking pin during normal lift, so that the rotational force by the general cam is transmitted to the valve in the vertical motion, thereby improving the efficiency according to the engine conditions. Rather, it relates to a cylinder stop device for a vehicle that enables easy processing of each part, ensures operability, and minimizes the number of parts to ensure excellent assembly and cost reduction.

Recently, with the increase in oil prices, many fuel efficiency improvement technologies for gasoline vehicles using a variable valve train have been applied. The cylinder stop device among the plurality of variable valve train technologies is a technology for reducing pumping and friction loss by stopping some unnecessary cylinders according to the load of the engine.

For effective application of the cylinder stopper, a device is needed to completely remove the valve lift of each stopper cylinder, which must meet the following functions and requirements.

1) Conversion between general cam and zero lift cam should be possible.

2) The conversion between the normal cam and the zero lift cam must be completed within one cycle of the engine.

3) There should be no mechanical force in the valve changeover and there should be no excessive force.

4) It must have an appropriate level of rigidity and durability.

5) Valve clearance should be maintained.

The cylinder stop device was mass-produced in the first and second makers (Chrysler / Honda) and the like with a large displacement engine such as V8 or V6.

FIG. 9 is a block diagram showing the cylinder stop device of the first maker. In the first maker Chrysler, the cylinder 7 is inserted into the push rod 1 of the OHV V8 engine by inserting the device 7 as shown in FIG. A stop was implemented.

 At this time, when no hydraulic pressure is applied, the pin is inserted and the push rod 1 is pushed up by the cam 3, and when the hydraulic pressure is applied, the pin is released and the movement of the cam 3 is moved to the valve 5. Not delivered.

Reference numeral 9 is a rocker arm.

However, this device is a structure suitable for the push rod method, which is difficult to apply to the OHC structure, and has a special characteristic for the OHV structure.

FIG. 11 is a plan view illustrating a cylinder stop device of a second maker. In the second maker (Honda), a center stop rocker arm type cylinder stop device is implemented by applying a VTEC system.

At this time, when the hydraulic pressure is not transmitted, the sliding pin is inserted, when the hydraulic pressure is applied, the sliding pin is separated to stop the movement of the valve.

However, in the above structure, when hydraulic pressure is applied to release the sliding pin, a load is generated on the return spring of the opposite pin, thereby continuously sliding contact.

FIG. 12 is a perspective view illustrating a cylinder stop device of a third maker (Eaton), and in the case of the third maker, a cylinder stop device suitable for a swing arm type is implemented.

However, due to the characteristics of the swingarm method, one valve is required for each valve, and accordingly, a latching system must be configured for each valve.

The present invention has been made in view of the above, the cam and zero lift cam fixed side by side so as to be eccentric to the cam shaft, the middle arm is pressed by the rotation of the general cam, and coaxially with the middle arm A rocker arm hinged to the rocker arm, a return means mounted to the lower portion of the low body to elastically support the middle arm, a push end formed at the front end of the rocker arm to press the upper end of the valve, and the middle arm and the rocker during normal lift By including fastening means to move the arm integrally, it is possible to reduce the number of parts compared to the existing system for cost reduction, easy processing of each part and assures the operability to ensure unique technology for vehicles The purpose is to provide a cylinder stop.

The present invention for achieving the above object is a cylinder stop device for a vehicle,

A general cam and a zero lift cam fixed to the camshaft in parallel with each other; A middle arm pressurized by the rotation of the general cam; A rocker arm having a cutout formed in the middle to insert the middle arm, and having a rear end hinged to the hinge axis coaxially with the middle arm; Return means mounted to a lower portion of the rocker arm to support the middle arm; A pressing end formed at the front end of the rocker arm to press the upper end of the valve; And a fastening means for allowing the middle arm and the rocker arm to move together in a normal lift.

In a preferred embodiment, the fastening means includes a through hole formed in the transverse direction at the front end of the middle arm and the rocker arm; A return tube inserted into one of the through holes of the rocker arm and a second return spring supporting the return tube; Inserted into the through hole of the middle arm, one end is supported by the return tube and the second return spring so that the middle arm and the rocker arm are integrally engaged in the normal lift, the other end is rocker in the middle arm through the through hole It comprises a locking pin to move to the arm, the locking pin is characterized in that to move from the rocker arm to the middle arm under hydraulic pressure to separate the rocker arm and the middle arm at zero lift.

In a more preferred embodiment, the locking pin is characterized by consisting of a large diameter portion and a small diameter portion having a relatively different diameter, and a flow path groove formed to move the locking pin by supplying hydraulic pressure between the large diameter portion and the small diameter portion.

In addition, the hydraulic pressure applied to the locking pin is generated by the fluid supplied through the hydraulic supply portion formed on the hinge shaft, the connecting passage formed in communication with the through hole into which the locking pin is inserted, and the flow path groove of the locking pin during zero lift. It is characterized by.

In addition, the return means is a spring mounting portion formed concave downward in the middle of the rocker arm, the first return spring is installed in the vertical direction in the spring mounting portion, and the ballistic sphere fixed to the upper end of the spring to support the middle arm Characterized in that consisting of.

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

1 is a perspective view illustrating a cylinder stop device for a vehicle according to the present invention, and FIG. 2 is an exploded perspective view of FIG. 1.

The present invention relates to a vehicle cylinder stop device for stopping the cylinder by completely removing the valve lift of some of the unnecessary cylinder in accordance with the load of the engine.

The present invention focuses on making it possible to produce with a minimum number of parts and produce at a low cost, and to be easy to process and operate compared to the systems of current mass production competitors.

According to the present invention, a camshaft (10) receiving a rotational force of a crankshaft, a general cam (11) and a zero lift cam (12) having two kinds of profiles, and an intake / exhaust valve according to an engine load are provided. The middle arm 14 and the rocker arm 15 which are provided in the upper part of the valve 13 so that the up-down operation range of 13 may be comprised are comprised.

The camshaft 10 receives and rotates the rotational force of the crankshaft by a power transmission means such as a belt, and the two types of general cams 11 and zero lift cams 12 fixed to the camshaft 10 are the number of cylinders of the engine. And the number and shape of the cams can be modified according to the shape.

The general cam 11 is disposed in pairs with the zero lift cam 12 on the cam shaft 10 and coaxially arranged side by side, and one side of the cam is protruded eccentrically in a wedge shape to the cam shaft 10. The rotation of the cam causes the projection of the cam to periodically linearly move the driven body.

That is, such a cam normally serves to convert the rotational movement into a linear movement.

The middle arm 14 is disposed below the general cam 11 so that the cam protrusion 11a presses the upper surface of the middle arm 14 by the rotation of the general cam 11. The zero lift pad 15a is installed and serves to maintain the valve gap when there is no valve lift, and the zero lift cam 12 is positioned above the zero lift pad 15a.

The rocker arm 15 has a “c” shape, a cutout 16 is formed in the middle of the rocker arm 15, and the middle arm 14 is inserted through the cutout 16. The rear end of the 14 and the rocker arm 15 are hinged coaxially by the hinge shaft 17.

A pressing end 15b is formed at the front end of the rocker arm 15, and the pressing end 15b is disposed on the upper end of the valve 13 provided with the spring 18 and is vertically moved around the hinge shaft 17. Rotate in the direction.

A return means is mounted at the middle of the rocker arm 15 so that the front end of the general cam 11 moves up and down.

A spring mounting portion 15c is formed at an intermediate lower portion of the rocker arm 15 in an approximate " U " shape in the lower direction of the cutout 16, and a first return spring 19 is formed on the spring mounting portion 15c. Is installed, the upper end of the return spring 19, the tanji 20 is fixed, the tanji 20 is substantially supporting the bottom of the middle arm (14).

The present invention provides a fastening means for moving the middle arm 14 and the rocker arm 15 separately at the time of zero lift, and moving the middle arm 14 and the rocker arm 15 at the time of general lift.

The fastening means includes a locking pin 21 mounted inside the middle arm 14, a return tube 23 and a second return spring 22 mounted inside the rocker arm 15.

The locking pin 21, the return tube 23, and the second return spring 22 are inserted into the middle arm 14 and the rocker arm 15 in the forward direction of the hinge shaft 17 to move horizontally. The through holes 14 ', 15', 15 "are formed in the direction.

The locking pin 21 is composed of a large diameter portion 21a and a small diameter portion 21b having relatively different diameters, and a flow path groove 21c is formed between the large diameter portion 21a and the small diameter portion 21b. , The hydraulic pin is supplied through the flow path groove 21c to move the locking pin 21 at zero lift to separate the middle arm 14 and the rocker arm 15.

A stepped portion 14a protrudes from the end along the inner circumferential surface of the middle arm 14, and the small diameter portion 21b of the locking pin 21 is inserted into the stepped portion 14a and has a relatively large inner diameter. The large diameter portion 21a of the locking pin 21 is inserted through the through hole 14 'of the arm 14.

At this time, the step portion 14a serves as a stopper to prevent the large diameter portion 21a of the locking pin 21 from going beyond the middle position of the middle arm 14.

The through holes 15 ′ and 15 ″ of the rocker arm 15 are separated from each other with the cutout 16 interposed therebetween, and one of the through holes has a large diameter portion of the locking pin 21. A return tube 23 having the same diameter as 21a is inserted, and one end of the locking pin 21 is moved from the middle arm 14 to the rocker arm 15 during the normal lift in one of the through holes. It is possible.

At this time, the diameter of the through hole 15 'into which the return tube 23 is inserted is relatively larger than the diameter of the opposite through hole 15 ", and one side of the through hole 15' into which the return tube 23 is inserted. That is, one end of the rocker arm 15 into which the return tube 23 is inserted is blocked.

A hollow part is formed in the return tube 23 to allow the second return spring 22 to be inserted, one end of the return tube 23 is opened, and the other end of the return tube 23 is closed and locked. It comes into contact with the large diameter portion 21a of the pin 21.

The second return spring 22 is inserted through the opening of the return tube 23, and one end of the spring 22 is fixed to the inner wall surface of the rocker arm 15 that is closed, so that the large diameter of the locking pin 21 is provided. The portion 21a is elastically supported by the return tube 23 and the second return spring 22.

The present invention provides hydraulic pressure which is a driving force that the locking pin 21 can move to one side so that the middle arm 14 and the rocker arm 15 move integrally during a general lift.

The operation of the hydraulic pressure is controlled by receiving a control signal of the control unit to change the opening and closing timing and lift of the valve 13 according to the engine load.

A hollow portion 17a through which the fluid flows is formed in the hinge shaft 17, and a hydraulic supply portion 17b is formed at one side of the rocker arm 15, and a through hole 14 ′ of the middle arm 14 is formed. ) Is connected to the hydraulic supply unit 17b.

The hydraulic pressure is supplied through the hydraulic pressure supply unit 17b → the connecting passage → the through hole 14 '→ the flow path groove 21c to move the locking pin 21.

Referring to the operating state of the vehicle cylinder stop device according to the present invention by such a configuration as follows.

As described above, the vehicular cylinder stop device controls the opening and closing timing and lift of the valve 13 by the profile shapes of the general cam 11 and the zero lift cam 12 according to the engine conditions.

Figure 3 is a side view showing the operating state of the cylinder stop device for a vehicle during a normal lift, Figure 4 is a cross-sectional view showing the operating state of the locking pin during a normal lift.

In the normal lift, the middle arm 14 and the rocker arm 15 move integrally.

More specifically, by rotating the camshaft 10, the general cam 11 and the zero lift cam 12 rotate in the same rotation speed and direction.

Subsequently, the general cam 11 presses the upper surface of the middle arm 14, and the bottom surface of the middle arm 14 is supported by the bullet strip 20 of the first return spring 19, so that the first return spring ( 19) is compressed and returned to its original position by the spring force.

At this time, since a certain portion of the locking pin 21 and the return tube 23 is inserted into the middle arm 14 and the remaining portions are inserted into both sides of the rocker arm 21, the middle arm 14 and the rocker arm 15 are It moves in one piece.

Since moving the valve 13 in the up and down direction is a pressing end 15b formed substantially at the front end of the rocker arm 15, the general cam 11 when the middle arm 14 and the rocker arm 15 move integrally. The rotational force of is transmitted to the valve (13).

Therefore, in the normal lift, the valve 13 is moved by a constant valve lift by the general cam 11.

Figure 5 is a side view showing the operating state of the cylinder stop device for a vehicle during zero lift, Figure 6 is a cross-sectional view showing the operating state of the locking pin and the return tube during zero lift.

On the other hand, during the zero lift, the middle arm 14 and the rocker arm 15 move separately.

More specifically, in order to move the middle arm 14 and the rocker arm 15 separately, the hydraulic pressure is operated by a control signal to the control unit, the hydraulic pressure is supplied to the hydraulic supply unit 17b → connecting passage → through hole 14 ') → the locking pin 21 is pressed through the path of the euro groove 21c.

The locking pin 21 pushes the return tube 23, and the second return spring 22 installed in the right through hole 15 ′ is compressed to lock the pin 21 to the middle arm 14. 23 is inserted into the right through-cylinder of the rocker arm 15, respectively, and is not interfered by the locking pin 21 and the return tube 23 when the middle arm 14 rotates.

Therefore, when the general cam 11 presses the upper surface of the middle arm 14 by the rotation of the cam shaft 10, the middle arm 14 rotates downward and is supported by the lower part of the middle arm 14. When the spring 19 is compressed and the general cam 11 is further rotated and the pressing force is released, the spring 19 is returned to its original position by the inertia of the return spring 19, and there is no valve lift due to the rotation of the cam shaft 10. .

Therefore, in the high speed section, the valve lift by the general cam 11 is relatively high, thereby increasing the amount of intake and exhaust, and in the low speed section, the middle pin 14 and the rocker arm 15 are separated by releasing the locking pin 21. By stopping the valve operation of some cylinders, the amount of mixer and exhaust gas can be controlled according to the engine conditions, thereby increasing the engine efficiency.

In addition, it can be applied with a minimum number of parts compared to the systems of current mass production competitors, which can be produced at low cost, and the processing of each part is easy and the operation is certain.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And all of the various forms of embodiments that can be practiced without departing from the technical spirit.

As described above, according to the present invention, the valve lift by the general cam is relatively high in the high speed section, the intake and exhaust volume is increased, and in the low speed section by separating the middle arm and the rocker arm by releasing the locking pin In addition, the valve operation of some cylinders can be stopped to increase the engine efficiency by controlling the amount of mixer and exhaust gas according to engine conditions.

In addition, it can be applied with a minimum number of parts compared to the systems of current mass production competitors, which can be produced at low cost, and the processing of each part is easy and the operation is certain.

Claims (5)

In the cylinder stop device for a vehicle, A general cam 11 and a zero lift cam 12 fixed to the camshaft 10 in parallel with each other; Middle arm 14 is pressed by the rotation of the general cam (11); A rocker arm 15 is formed in the middle so that the middle arm 14 is inserted, and a rear end thereof is hinged to the hinge shaft 17 coaxially with the middle arm 14; Return means mounted to the lower portion of the rocker arm 15 to support the middle arm 14; A pressing end 15b formed at the front end of the rocker arm 15 to press the upper end of the valve 13; As the middle arm 14 and the rocker arm 15 move integrally during a normal lift, through holes 14 'and 15' formed transversely in front of the middle arm 14 and the rocker arm 15; 15 "), a return tube 23 inserted into one of the through holes of the rocker arm 15, a second return spring 22 supporting the return tube 23, and a through hole of the middle arm 14 It is inserted into (14 '), and one end is supported by the return tube 23 and the second return spring 22 so that the middle arm 14 and the rocker arm 15 are integrally fastened during the general lift. Fastening means including a locking pin (21) whose end portion moves from the middle arm (14) to the rocker arm (15) through the through hole (15 "); It is configured to include, The locking pin 21 is supplied with hydraulic pressure between the relatively large diameter portion 21a and the small diameter portion 21b and the large diameter portion 21a and the small diameter portion 21b to move the locking pin 21. Cylinder stop device for a vehicle, characterized in that consisting of a flow path groove (21c) formed to be. delete delete The method according to claim 1, The hydraulic pressure applied to the locking pin 21 is connected to the hydraulic supply part 17b formed in the hinge shaft 17 and the through hole 14 'into which the locking pin 21 is inserted during zero lift. And, the cylinder stop device for a vehicle, characterized in that generated by the fluid supplied through the flow path groove (21c) of the locking pin (21). The method according to claim 1, The return means includes a spring mounting portion 15c recessed downwardly in the middle of the rocker arm 15, a first return spring 19 installed perpendicularly to the spring mounting portion 15c, and the middle arm ( 14) The cylinder stop device for a vehicle, characterized in that consisting of a ballast 20 fixed to the top of the spring to support.

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