KR20110127944A - A compulsory open-close device for intake/exhaust valve of engine - Google Patents

Abstract

PURPOSE: A compulsory valve switching device of an engine is provided to prevent the malfunction in which a valve is switched by pushing out a push rod to the upper through the equipment of a second elastic member. CONSTITUTION: A compulsory valve switching device of an engine comprises a cylinder block(10), a cylinder head(20), a cylinder head cover(30), an inlet valve(40) and a first cam(60). In the cylinder block, one or more cylinder(11) in which each piston is shuttled is installed. The cylinder head is combined with the cylinder block and forms an inlet hole(21) and an outlet hole(22) which is communicated with the cylinder. The cylinder head cover is extended in the rim of the cylinder head and protects the cylinder head. The inlet switches the inlet hole. The first cam is formed in the cylinder head top center.

Description

Compulsory open-close device for intake / exhaust valve of engine}

The present invention relates to a valve opening and closing device, and more particularly, to a valve opening and closing device for forcibly opening and closing the valve in the operating conditions under the load on the engine.

Generally, a machine that converts thermal energy generated by combustion of fuel or other heat source into mechanical energy is called a heat engine, and these heat engines are classified into an external combustion engine and an internal combustion engine.

Internal combustion engines are divided into gasoline engines, diesel engines and gas engines according to the fuel used, and are further divided into reciprocating and rotary motion types according to the movement method. The reciprocating type converts the reciprocating motion of the piston into a rotational motion through a crank mechanism, and the rotary motion type directly converts the energy of the combustion gas into the rotational motion of the shaft, such as a gas turbine.

In the internal combustion engine of automobiles, gasoline engines using gasoline as fuel and diesel engines using light or heavy oil are mainly used, and gasoline engines are almost used in passenger cars which desire high speed.

In a typical four cycle engine, an intake valve and an exhaust valve are respectively provided to draw the mixer into the combustion chamber and discharge the combustion gas to the outside, and the intake valve and the exhaust valve are reciprocated as the cam rotates to open and close. Do it.

However, the opening and closing operations of the intake valves and the exhaust valves are repeatedly generated while the vehicle is driving on a flat surface or driving downhill, and thus do not perform a no-load operation, but rather cause excessive consumption of fuel.

SUMMARY OF THE INVENTION The present invention is directed to solving the problems described above, and one embodiment of the present invention relates to saving fuel by selectively converting some cylinders of a multicylinder engine to a normal operation and a dead operation state.

According to a preferred embodiment of the present invention, a cylinder block is installed at least one cylinder to which each piston is reciprocated; A cylinder head coupled to the slender block and having an inlet and an exhaust port communicating with the cylinder; A cylinder head cover extending upward from the cylinder head rim and surrounding the cylinder head; An intake valve which opens and closes the intake port and comprises an intake valve head and an intake valve stem; A first cam formed at a point spaced upward from a cylinder head upper surface center; A rocker arm which opens and closes the intake valve according to the rotation of the first cam, one end of which is in contact with the first cam, and the other end of which is in contact with the intake valve; A first elastic member formed on an outer circumferential surface of the intake valve stem and disposed between the lower side of the rocker arm and the upper side of the cylinder head; A support shaft extending upward from the cylinder head cover; A pressure lever in which the horizontal lever and the tilt lever are integrally coupled; Located under the horizontal lever, the push rod comprising a head and a body; And an actuator coupled to one end of the inclined lever, wherein the connecting portion of the horizontal lever and the inclined lever is hinged to the support shaft, and the horizontal lever presses the push rod as the actuator is driven upward, thereby opening the intake valve. A forced valve opening and closing device for an engine is provided.

According to one embodiment of the present invention as described above, first, since the exhaust valve or the intake valve of the engine can be forcibly opened and closed, it is possible to save fuel by allowing only two cylinders to operate normally in a four-cylinder engine.

Second, the second elastic member is provided, so that the push rod is pushed upward when it is not a no-load driving condition, thereby preventing a malfunction in which the valve is opened and closed.

Third, since the push rod is guided by the guide portion, it is possible to always transmit the pressing force to the rocker arm stably.

Fourth, the push rod is inserted into the push rod groove to prevent the departure from the contact surface when the pressing force is operated.

Fifth, the actuator is automatically operated using a vehicle speed sensor, an accelerator pedal sensor, a slope gradient sensor, and an engine speed sensor, thereby improving convenience.

1 is a cross-sectional view showing a forced valve opening and closing device of the engine according to an embodiment of the present invention,
2 is a cross-sectional view showing a forced valve opening and closing device of the engine according to another embodiment of the present invention.

Hereinafter, a preferred embodiment of the forced valve opening and closing device of the engine according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the 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 in the element may be included in the scope of the present invention.

1 is a cross-sectional view showing a forced valve opening and closing device of the engine according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a forced valve opening and closing device of the engine according to another embodiment of the present invention.

Forced valve opening and closing device of the engine according to a preferred embodiment of the present invention, the cylinder block 10 is provided with at least one cylinder (11) for each piston 12 is reciprocated; A cylinder head 20 coupled to the slender block and having an inlet port 21 and an exhaust port 22 communicating with the cylinder 11; A cylinder head cover 30 extending upward from an edge of the cylinder head 20 and surrounding the cylinder head 20; An intake valve 40 which opens and closes the intake port 21 and includes an intake valve head 41 and an intake valve stem 42; A first cam (60) formed at a point spaced upwardly from an upper surface center of the cylinder head (20); The intake valve 40 is opened and closed according to the rotation of the first cam 60, one end is in contact with the first cam 60, and the other end is in contact with the intake valve 40. ); A first elastic member 70 formed on an outer circumferential surface of the intake valve stem 42 and provided between the lower surface of the rocker arm 80 and the upper surface of the cylinder head 20; A support shaft 90 extending upward from an upper side of the cylinder head cover 30; A pressure lever 100 in which the horizontal lever 101 and the inclined lever 102 are integrally coupled; A push rod 110 positioned below the horizontal lever 101 and including a head 111 and a body 112; And an actuator 120 coupled to one end of the inclined lever 102. The connecting portion of the horizontal lever 101 and the inclined lever 102 is hingedly connected to the support shaft 90. As the actuator 120 is driven upward, the horizontal lever 101 presses the push rod 110 to open the intake valve 40.

As shown in Figure 1, the present invention, the cylinder block 10, cylinder head 20, cylinder head cover 30, intake valve 40, the first cam 60, rocker arm 80, the first It includes an elastic member 70, the support shaft 90, the pressure lever 100, the push rod 110, the actuator 120.

The cylinder block 10 is a mother body of the engine, and the cylinder block 10 is provided with one or more cylinders 11. The piston 12 slides along this cylinder 11. Cylinder block 10 is made of cast iron or aluminum alloy, in the case of four-stroke engine cylinders are arranged in a row.

The cylinder head 20 is coupled to the cylinder block 10. The cylinder head 20 is provided with an inlet port 21 and an exhaust port 22, which are passages for supplying fuel or fuel and air to the cylinder 11, and for discharging the exhaust gas.

The cylinder head cover 30 extends upward from the edge of the cylinder head 20, and the overall shape is provided in a hexahedral shape with a lower surface opened. It is possible to manufacture the cylinder head cover 30 with magnesium alloy for sufficient rigidity and weight reduction.

The first cam 60 is spaced apart from the center of the upper surface of the cylinder head 20 by a predetermined distance.

The rocker arm 80 is formed in a convex upward shape, one end is in contact with the first cam 60, the other end is in contact with the intake valve 40. Accordingly, as the first cam 60 rotates, the other end of the rocker arm 80 in contact with the intake valve 40 presses the intake valve 40 to open the intake port 21.

The intake valve 40 includes an intake valve stem 42 and an intake valve head 41. The first elastic member 70 is installed on an outer circumferential surface of the intake valve stem 42 protruding to the outside of the cylinder head 20.

The support shaft 90 protrudes upward from the cylinder head cover 30.

As shown in FIG. 1, the pressure lever 100 includes a horizontal lever 101 formed horizontally and an inclined lever 102 formed obliquely. The horizontal lever 101 and the inclined lever 102 are integrally coupled.

The actuator 120 is coupled to the end of the inclined lever 102.

The push rod 110 is positioned below the horizontal lever 101. The push rod 110 includes a head 111 and a body 112, and is provided in a T-shape as a whole.

Since the connecting portion in which the horizontal lever 101 and the inclined lever 102 are integrally coupled is hinged to the support shaft 90, the horizontal lever 101 moves the push rod 110 as the actuator 120 is driven upward. By pressurizing, the intake valve 40 is forcibly opened and closed. That is, since the push rod 110 is pressed by the pressure lever 100 using the principle of the lever, the intake valve 40 can be opened and closed with a small force.

In the forced valve opening and closing apparatus of the engine according to the preferred embodiment of the present invention, the exhaust port 22 is provided with a check valve 130 so that the exhaust gas passing through the exhaust valve 50 is not discharged again but only discharged. do.

The check valve 130 is installed on the exhaust outlet side. The check valve 130 only serves to discharge the exhaust gas passing through the exhaust valve 50 and is not sucked again.

When the exhaust gas is introduced again, the incompletely burned fuel is introduced again, thereby bringing about a lean burn in a no-load state, thereby solving this problem through the check valve 130.

In the forced valve opening and closing device of the engine according to an embodiment of the present invention, the cylinder header cover extending downward from one end, the center is provided with a guide portion 140 formed with a through hole.

As shown in FIG. 1, the guide part 140 is provided. Guide portion 140 has a through-hole is formed in the center, it is made of a cylindrical shape as a whole.

In the forced valve opening and closing device of the engine according to an embodiment of the present invention, one end of the body portion 112 is located in the guide portion 140, the body portion 112 exposed to the outside of the cylinder head cover 30. The second elastic member 71 is provided on the outer circumferential surface.

As shown in FIG. 1, since one end of the body part 112 is positioned in the guide part 140, the push rod 110 is guided and moved by the guide part 140, so that the rocker arm 80 is always stably. It can transmit the pressing force.

Since the second elastic member 71 is provided on the outer circumferential surface of the body part 112 exposed to the outside of the cylinder head cover 30, the body part 112 is provided with sufficient elasticity, so that the push rod ( 110 is pushed upwards to prevent malfunction of opening and closing the valve.

In the forced valve opening and closing device of the engine according to an embodiment of the present invention, a push rod groove is formed at the upper end of the rocker arm 80, the end of the push rod 110 in a shape corresponding to the push rod groove It is provided, the end of the push rod 110 is fitted into the push rod groove.

As shown in Figure 1, the push rod groove is provided. A push rod groove is provided at a portion where the push rod 110 and the rocker arm 80 are in contact with each other, and the end of the push rod 110 has a shape corresponding to the push rod groove.

Since the push rod 110 is inserted into the push rod groove, the push rod 110 and the rocker arm 80 may be prevented from slipping from each other on the contact surface even when sufficient pressure is applied to the rocker arm 80.

A cylinder block 10 on which at least one cylinder 11 through which each piston 12 is reciprocated is installed; A cylinder head 20 coupled to the slender block and having an inlet port 21 and an exhaust port 22 communicating with the cylinder 11; A cylinder head cover 30 extending upward from an edge of the cylinder head 20 and surrounding the cylinder head 20; An exhaust valve 50 which opens and closes the exhaust port 22 and includes an exhaust valve head 51 and an exhaust valve stem 52; A first elastic member 70 formed on an outer circumferential surface of one end of the exhaust valve stem 52 protruding from the cylinder head 20; A second cam (61) spaced apart from the exhaust valve (50); A lifter 150 which opens and closes the exhaust valve 50 according to the rotation of the second cam 61, and is installed between the exhaust valve 50 and the second cam 61; A support shaft 90 extending upward from an upper side of the cylinder head cover 30; A pressure lever 100 in which the horizontal lever 101 and the inclined lever 102 are integrally coupled; A push rod 110 positioned below the horizontal lever 101 and including a head 111 and a body 112; And an actuator 120 coupled to one end of the inclined lever 102. The connecting portion of the horizontal lever 101 and the inclined lever 102 is hingedly connected to the support shaft 90. As the actuator 120 is driven upward, the horizontal lever 101 pressurizes the push rod 110 to open the exhaust valve 50.

Forced valve opening and closing device of the engine according to another embodiment of the present invention, the cylinder block 10, the cylinder head 20, the cylinder head cover 30, the exhaust valve 50, the first elastic member 70, 2 cam 61, the lifter 150, the support shaft 90, the pressure lever 100, the push rod 110, the actuator 120 is made.

The exhaust valve 50 includes an exhaust valve head 51 and an exhaust valve stem 52. The first elastic member 70 is installed on the outer circumferential surface of the exhaust valve stem 52 protruding out of the cylinder head 20.

The second cam 61 is positioned spaced apart from the exhaust valve 50 by a predetermined distance.

The lifter 150 is positioned between the second cam 61 and the exhaust valve 50. As the second cam 61 rotates, the lifter 150 presses the exhaust valve 50 to open the exhaust port 22.

As shown in FIG. 2, even when the exhaust valve 50 is opened by the overhead cam, the support shaft 90, the pressure lever 100, the push rod 110, and the actuator are the same as in the case of the rocker arm 80. It is possible to forcibly open the exhaust port 22 using the 120.

In the forced valve opening and closing apparatus of the engine according to the preferred embodiment of the present invention, the exhaust port 22 is provided with a check valve 130 so that the exhaust gas passing through the exhaust valve 50 is not discharged again but only discharged. do.

The check valve 130 is installed at the exhaust outlet side of the forced valve opening and closing device of the engine shown in FIG. 2. The check valve 130 only serves to discharge the exhaust gas passing through the exhaust valve 50 and is not sucked again.

In the forced valve opening and closing device of the engine according to an embodiment of the present invention, the vehicle speed sensor 160 for detecting the speed of the vehicle; Acceleration pedal sensor 170 for determining whether the driver has a rapid acceleration; Gradient gradient sensor 180 for determining the inclination of the road; And an engine speed sensor 190 for detecting a rotation speed of the engine. The actuator 120 is automatically operated by comparing the data values output from the sensors with the input reference value.

As shown in FIG. 2, the vehicle speed sensor 160, the accelerator pedal sensor 170, the slope gradient sensor 180, and the engine speed sensor 190 may be provided.

The vehicle speed sensor 160 measures the speed of the vehicle, and the accelerator pedal sensor 170 recognizes how much the driver has stepped on the accelerator pedal, and the slope gradient sensor 180 drives the vehicle on a flat surface or on a slope road. Determining the inclination of the, the engine speed sensor 190 measures the engine speed.

Comparing the data value output from the vehicle speed sensor 160, the accelerator pedal sensor 170, the slope gradient sensor 180, the engine speed sensor 190 with the input reference value to automatically operate the actuator 120 It is possible.

The actuator 120 may use a hydraulic cylinder operated by lubricating oil pressurized by a lubrication pump for lubrication of the engine. It is also possible to use a stepping motor.

That is, by receiving the output signal from the vehicle speed sensor 160, the accelerator pedal sensor 170, the slope gradient sensor 180, the engine speed sensor 190 to control the stepping motor or the hydraulic cylinder of the actuator 120 It is possible to design so that ON / OFF is done automatically, and in this case, the user's convenience is improved compared to manual operation.

By using the forced valve opening and closing device of the engine of the present invention, it is possible to selectively convert some cylinders of the multi-cylinder engine to the normal operation and the dead operation state, so that there is no compression stroke and explosion stroke in the dead operation cylinder, which is unnecessary. Power loss can be eliminated, saving fuel.

For example, on a four-cylinder engine, it is possible to deaden two cylinders while driving on a flat or downhill road and allow the remaining two cylinders to operate normally. At this time, since the two-cylinder cylinder in the dead operation state is in communication with the atmosphere and the fuel supply is cut off, the dead-cylinder cylinders are operated at no load state, and thus, it is possible to travel at a predetermined speed with only the two cylinders. In this case, it is possible to fully drive the car with only 80% or less fuel supply compared to normal operation of all four cylinders.

10: cylinder block, 11: cylinder, 12: piston
20: cylinder head, 21: inlet port, 22: exhaust port
30: cylinder head cover
40: intake valve, 41: intake valve head, 42: intake valve stem
50: exhaust valve, 51: exhaust valve head, 52: exhaust valve stem
60: first cam, 61: second cam
70: first elastic member, 71: second elastic member
80: rocker arm
90: support shaft
100: pressurized lever, 101: horizontal lever, 102: inclined lever
110: push rod, 111: head portion, 112: body portion
120: actuator
130: check valve
140: guide part
150: lifter
160: vehicle speed sensor
170: accelerator pedal sensor
180: slope gradient sensor
190: engine speed sensor

Claims (8)

A cylinder block on which at least one cylinder to which each piston is reciprocated is installed;
A cylinder head coupled to the slender block and having an inlet and an exhaust port communicating with the cylinder;
A cylinder head cover extending from the edge of the cylinder head and surrounding the cylinder head;
An intake valve configured to open and close the intake port, the intake valve head including an intake valve stem;
A first cam formed at a point spaced upward from the upper surface center of the cylinder head;
A rocker arm configured to open and close the intake valve according to the rotation of the first cam, one end of which is in contact with the first cam, and the other end of which is in contact with the intake valve;
A first elastic member formed on an outer circumferential surface of the intake valve stem and disposed between the lower surface of the rocker arm and the upper surface of the cylinder head;
A support shaft extending upward from the cylinder head cover;
A pressure lever in which the horizontal lever and the tilt lever are integrally coupled;
A push rod positioned below the horizontal lever and including a head part and a body part; And
Actuator is coupled to one end of the inclined lever;
A connecting portion of the horizontal lever and the inclined lever is hingedly connected to the support shaft, and the horizontal lever presses the push rod as the actuator is driven upward, thereby opening and closing the intake valve. Device.
The method of claim 1, wherein the exhaust port,
Forced valve opening and closing device of the engine, characterized in that the check valve is provided so that the exhaust gas passing through the exhaust valve is not sucked again.
The method according to claim 1 or 2,
Forced valve opening and closing device of the engine, characterized in that extending from one end of the cylinder header cover, the center is provided with a guide portion formed with a through hole.
The method of claim 3, wherein
One end of the body portion is located in the guide portion,
Forced valve opening and closing device of the engine, characterized in that the second elastic member is provided on the outer peripheral surface of the body portion exposed to the outside of the cylinder head cover.
The method of claim 4, wherein
One end of the rocker arm is formed with a push rod groove,
The push rod end is provided in a shape corresponding to the push rod groove,
Forced valve opening and closing device of the engine, characterized in that the push rod end is fitted into the push rod groove.
A cylinder block on which at least one cylinder to which each piston is reciprocated is installed;
A cylinder head coupled to the slender block and having an inlet and an exhaust port communicating with the cylinder;
A cylinder head cover extending from the edge of the cylinder head and surrounding the cylinder head;
An exhaust valve which opens and closes the exhaust port and comprises an exhaust valve head and an exhaust valve stem;
A first elastic member formed on an outer circumferential surface of one end of the exhaust valve stem protruding from the cylinder head;
A second cam spaced upward from the exhaust valve;
A lifter which opens and closes the exhaust valve according to the rotation of the second cam, and is installed between the exhaust valve and the second cam;
A support shaft extending upward from the cylinder head cover;
A pressure lever in which the horizontal lever and the tilt lever are integrally coupled;
A push rod positioned below the horizontal lever and including a head part and a body part; And
Actuator is coupled to one end of the inclined lever;
A connecting portion of the horizontal lever and the inclined lever is hinged to the support shaft, and the horizontal lever presses the push rod as the actuator is driven upward, thereby opening and closing the exhaust valve of the engine. Device.
The method of claim 6, wherein the exhaust port,
Forced valve opening and closing device of the engine, characterized in that the check valve is provided so that the exhaust gas passing through the exhaust valve is not sucked again.
The method of claim 7, wherein
A vehicle speed sensor detecting a speed of the vehicle;
Acceleration pedal sensor for determining whether the driver has a sudden acceleration;
A slope gradient sensor for determining a slope of a road; And
It is provided, including; engine speed sensor for detecting the engine speed;
Compulsory valve opening and closing device of the engine, characterized in that the actuator is automatically operated by comparing the data value output from the sensors with the input reference value.

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