KR19980044362A - Opening and closing variable device of variable valve - Google Patents

Abstract

The present invention relates to an opening and closing variable device of the variable valve, the cam 3 is rotated to elevate the other end around the rocker shaft 20 to open and close the intake valve (4) and exhaust valve (5), A rocker arm 10 provided with an oil chamber 30 at a position in contact with the intake valve 4 and the exhaust valve 5; An oil supply pipe 31 connected to the oil chamber 30 from a gallery hole of a cylinder head so as to communicate with the oil chamber 30; A hydraulic pin 34 which is lifted according to the oil pressure supplied to the oil chamber 30 and adjusts lift amounts of the intake valve 4 and the exhaust valve 5; A return spring 40 for elastically supporting the hydraulic pin 34 inside the oil chamber 30 to return when the oil pressure is removed; A hydraulic control valve 60 for adjusting the amount of oil supplied to the oil supply pipe 31 at the direction of the engine control unit 50 is provided, thereby providing an intake valve 4 and an exhaust valve according to the speed capability of the engine. The lift amount of 5) is variably adjusted.

Therefore, at low speeds, the opening and closing amount is reduced to meet the capability, thereby improving fuel economy.

In addition, stability is improved in the idle state.

In addition, during high-speed operation, the lift amount of the intake valve 4 and the exhaust valve 5 is increased to meet the capability, and the engine performance and acceleration force are improved by supplying sufficient fuel, and the reliability of the vehicle is improved.

In addition, it is possible to have the effect of the engine brake because the engine output is rapidly reduced at a low speed by installing the brake switch 70 in an emergency, so that the brake brake can be easily operated to shorten the braking distance in case of emergency do.

Therefore, it is very useful invention, such as enabling safe driving.

Description

Opening and closing variable device of variable valve

The present invention relates to an open / close variable device of a variable valve, and more particularly, to change the amount of opening and closing of the intake / exhaust valve to improve fuel efficiency and improve idle stability at low speed, and to increase performance and acceleration at high speed, and to select a switch. The engine brake is invented so that the output can be drastically reduced.

The engine is provided with an intake valve 4 for intake opening and closing for combustion, and on the other side, an exhaust valve 5 for exhausting is provided at each cylinder position in the cylinder head.

The intake valve 4 and the exhaust valve 5 are opened and closed by rocking the rocker arm 10.

On the other hand, the rocker arm 10 drives the rocker shaft 20 according to the protruding shape of the cam 3 by driving the cam 3 rotated by the power transmission of the cam pulley in contact with the rocker arm 10. Rocking motion to open and close the intake valve (4) and exhaust valve (5) in contact with its ends.

Conventionally, rocking arm 10 for opening / closing of intake valve 4 and exhaust valve 5 has a constant swing range.

Conventionally, according to the structure of the rocker arm 10 having the swing range of a certain angle, the lifting dimensions of the intake valve 4 and the exhaust valve 5 are always constant regardless of the performance of the engine.

In the case of an engine, for example, a relatively small amount of fuel intake is required at low speed, and a larger amount of fuel is required at high speed.

Therefore, in general, it is necessary to open and close all the intake valves 4 in high speed driving to supply a large amount of fuel necessary to have sufficient performance or acceleration power, but on the contrary, in a low speed driving and idling, a small amount suitable for the capability Only fuel may be supplied.

Nevertheless, in the case of a conventional engine, all of the intake valves 4 are opened and closed at a constant amount at all times, causing unnecessary excess fuel at low speeds and causing harmful exhaust gas to be released by incomplete combustion.

In addition, even when the fuel is not in a state of idling, as a result, fuel consumption is lowered and stability is not only reduced, but also a large amount of exhaust gas is released.

1 is a front view showing a partially cut out rocker arm in a state where the apparatus of the present invention is installed;

2 is an enlarged cross-sectional view of the main part of FIG. 1;

3 is a device diagram showing a lifting variable range of the exhaust valve;

4 is a device diagram showing a state in which the present invention is operated by the engine brake.

* Description of the symbols for the main parts of the drawings *

3-Cam 4-Intake Valve

5-exhaust valve 10-rocker arm

20-Rocker Shaft 30-Oil Chamber

31-Oil supply pipe 34-Hydraulic pin

40-Balance spring 50-Engine control unit

60-Hydraulic control valve 70-Braking switch

The object of the present invention is that the cam 3 is rotated to raise and lower the other end of the rocker shaft 20 to open and close the intake valve 4 and the exhaust valve 5, and the intake valve 4 And a rocker arm 10 having an oil chamber 30 at a position in contact with the exhaust valve 5;

An oil supply pipe 31 connected to the oil chamber 30 from a gallery hole of a cylinder head so as to communicate with the oil chamber 30;

A hydraulic pin 34 which is lifted according to the oil pressure supplied to the oil chamber 30 and adjusts lift amounts of the intake valve 4 and the exhaust valve 5;

A return spring 40 for elastically supporting the hydraulic pin 34 inside the oil chamber 30 to return when the oil pressure is removed;

It is achieved by the hydraulic control valve 60 is provided to adjust the amount of oil supplied to the oil supply pipe 31 at the instruction of the engine control unit 50.

According to the present invention described above, the position of the hydraulic pin 34 installed at the position in contact with the intake valve 4 and the exhaust valve 5 on the rocker arm 10 by the oil pressure different according to the acceleration capacity of the engine is adjusted. do.

Therefore, the lift amount at which the intake valve 4 and the exhaust valve 5 are opened and closed is varied, so that the hydraulic pin 34 is increased so that the lift amount of the intake valve 4 and the exhaust valve 5 is increased at high speed in accordance with the engine capability. ) Is withdrawn, and at low speeds, the lift capacity is accommodated inside the rocker arm 10 so as to reduce the lift amount, and the engine performance and fuel economy are improved by automatically controlling the performance to match the engine capacity.

In addition, the engine is stabilized in the idle state.

And, by adjusting the braking switch 70, the amount of LITTiness can be adjusted so as to drastically reduce the engine output, thereby having the effect of the engine brake.

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

FIG. 2 is a partially cutaway front view of the rocker arm 10 in which the rocker arm 10 of the present invention shows a structure in which the intake valves 4 and the exhaust valves 5 are lifted due to the swing of the cam 3.

As shown in this figure, the camshaft receiving power from the cam pulley is rotated, and the rocker shaft 20 is rotated by being rotated according to the protruding shape of the cam 3 installed at one lower end position of the rocker arm 10. As a result, the rocker arm 10 swings and opens and closes the intake valve 4 and the exhaust valve 5 in contact with the ends thereof.

The rocker arm 10 is provided in accordance with the number of cylinders for each of the positions of each intake valve 4 and exhaust valve 5.

The principle of contacting the intake valve 4 and the exhaust valve 5 of the rocker arm 10 is an oil chamber 30 which forms a space such that oil is supplied from the oil supply pipe 31 as shown in FIGS. 1 and 2. ) Is formed.

The hydraulic pin 34 which slides up and down by oil pressure is assembled inside the oil chamber 30, and the balance is maintained on the other side where the oil pressure is applied, and the hydraulic pin 34 is removed when the oil pressure is removed. A return spring 40 for returning is elastically installed.

The oil supply pipe 31 is supplied with oil from a gallery hole supplied at a predetermined pressure by an oil pump for lubrication of the cylinder head, and the supply amount thereof is adjusted by the hydraulic control valve 60.

On the other hand, this hydraulic control valve 60 is controlled by the signal of the engine control unit 50-ECU-the closing amount.

The rocker arm 10 having such a configuration, when the low speed according to the engine speed, the hydraulic control valve 60 is closed or only a very small amount is opened by the command of the engine control unit 50 so that the return spring 40 Since the elastic force is strongly applied, the hydraulic pin 34 is moved upward from the inside of the oil chamber 30.

Therefore, since the oil pressure acting on the gallery hole at a low speed of the engine is reduced, the elastic force of the balance spring 40 is increased compared to the oil pressure flowing into the oil chamber 30, so that the hydraulic pin 34 moves upward in the drawing. Even if the rocker arm 10 swings to the same range as a result of being conveyed and in contact with the intake valve 4 and the exhaust valve 5, the opening and closing amount is reduced, thereby reducing the engine output.

Therefore, the mixed fuel is taken in by the intake valve 4 in an amount suitable for low speed, and fuel economy and combustibility are stabilized by opening and closing the intake valve 4 in an optimum state suitable for low speed.

On the other hand, during high speed operation, the opening and closing amount of the hydraulic control valve 60 is increased by the command of the engine control unit 50.

Therefore, since the oil pressure is increased by comparing the elastic force with the balance spring 40 due to the increase in the oil pressure introduced into the oil chamber 30 through the oil supply pipe 31, the balance spring 40 is compressed and is shown in FIG. 2. One hydraulic pin 34 is moved in the lower balance spring 40 direction.

Therefore, since the hydraulic pin 34 is drawn out to the lower side of the rocker arm 10 and lifted in the state in which the respective intake valves 4 and the exhaust valve 5 are lowered to the inside of the combustion chamber, the intake amount and the exhaust amount are relatively relatively in the same stroke. It is increased.

As a result, the intake valve 4 and the exhaust valve 5 are opened and closed as much as possible in an optimal state at high speed so that the performance of the engine can be exhibited by supplying sufficient fuel.

In FIG. 4, a braking switch 70 electrically connected to the engine control unit 50 is installed to operate at a low speed by operating the braking switch 70 when stopping or downhill roads requiring rapid braking while driving. The hydraulic control valve 60 is controlled by the engine control unit 50 so as to abruptly reduce or stop the amount of oil supplied into the oil chamber 30 in the operating state as described above.

Therefore, the engine output is rapidly reduced at a low speed, and thus may have an effect of the engine brake, and the braking distance may be shortened in an emergency by allowing the foot brake to be easily operated.

On the other hand, during the sudden braking, as shown in FIG. 3, only the exhaust valve 5 is lifted as shown by the imaginary line in the compression stroke, thereby having a braking effect due to the sudden decrease in output by controlling the hydraulic pressure in the open state. It could be.

In addition, a sealing means is required between the hydraulic pin 34 and the oil chamber 30 to prevent oil leakage.

As described above, according to the present invention, the lift amount of the intake valve 4 and the exhaust valve 5 is variably adjusted according to the speed capability of the engine.

Therefore, at low speeds, the opening and closing amount is reduced to meet the capability, thereby improving fuel economy.

In addition, stability is improved in the idle state.

In addition, during high-speed operation, the lift amount of the intake valve 4 and the exhaust valve 5 is increased to meet the capability, and the engine performance and acceleration force are improved by supplying sufficient fuel, and the reliability of the vehicle is improved.

In addition, it is possible to have the effect of the engine brake because the engine output is rapidly reduced at a low speed by installing the brake switch 70 in an emergency, so that the brake brake can be easily operated to shorten the braking distance in case of emergency do.

Therefore, it is very useful invention, such as enabling safe driving.

An object of the present invention is to provide an engine that can automatically change the opening and closing amount of the intake valve according to the acceleration performance to improve its performance.

Another object of the present invention is to provide an engine capable of improving fuel economy and reducing the emission of harmful exhaust gas.

Another object of the present invention is to provide an engine to improve idle stability.

It is still another object of the present invention to provide an engine capable of obtaining the effect of an engine brake by rapidly reducing the engine output by selecting a switch when sudden braking is required.

Claims (2)

The cam 3 is rotated to raise and lower the other end of the rocker shaft 20 so as to open and close the intake valve 4 and the exhaust valve 5, and to the intake valve 4 and the exhaust valve 5. A rocker arm 10 provided with an oil chamber 30 at a contact position; An oil supply pipe 31 connected to the oil chamber 30 from a gallery hole of a cylinder head so as to communicate with the oil chamber 30; A hydraulic pin 34 which is lifted according to the oil pressure supplied to the oil chamber 30 and adjusts lift amounts of the intake valve 4 and the exhaust valve 5; A return spring 40 for elastically supporting the hydraulic pin 34 inside the oil chamber 30 to return when the oil pressure is removed; Opening and closing variable device of the variable valve, characterized in that provided with a hydraulic control valve (60) for adjusting the amount of oil supplied to the oil supply pipe (31) at the instruction of the engine control unit (50). The variable valve opening and closing device of claim 1, wherein the engine control unit (50) is configured to electrically connect a brake switch (70) to switch the engine to a low output.