KR19980051359A - Valve spring auxiliary valve device - Google Patents

Abstract

The present invention relates to a valve spring auxiliary valve device, the conventional intake valve and exhaust valve is a structure that is opened by the drive cam and closed by the valve spring, the valve spring is a spring constant so that it can be closed at the highest output of the engine Since the valve is designed to open when the engine is driven at low speed, the repulsive force of the valve spring acts excessively, and the normal valve opening cannot be achieved.

Accordingly, the present invention is an engine speed sensor 18 for detecting the output state of the engine as shown in Figures 2 to 3 is connected to only the input of the electronic control unit 20, the electronic control unit 20 An auxiliary valve device via the solenoid valve 22 at the output end of the valve spring auxiliary valve device is provided inside the cylinder head 10.

Therefore, the present invention has the effect of improving the output and fuel economy by installing a check ball to prevent the back flow of oil and mounting a solenoid valve to control the repulsive force of the spring even in the engine having a large valve inertia.

Description

Balance spring auxiliary valve device

The present invention relates to a valve spring auxiliary valve device, and more particularly, to a valve spring auxiliary valve device so that the reaction force of the corresponding valve spring acts when the output of the engine is operated at a low speed.

In general, the main body of the engine is a machine that generates power by converting thermal energy obtained from combustion of fuel into kinetic energy. Engines commonly used are divided into gasoline engine and diesel engine according to fuel, cylinder head, cylinder block, It is divided into three parts of the crankcase body, and its parts consist of stationary parts, motion parts and various accessories.

Here, the cylinder head, which is a stationary part, is equipped with an ignition plug in an intake valve, an exhaust valve and a gasoline engine, and a fuel injection nozzle in a diesel engine. FIG. 1 is a combustion chamber 2 of an engine 1. A perspective view showing the structure of a double overhead camshaft engine that supplies fuel and discharges combustion gas.

The valve mechanism has an overhead valve type and an overhead camshaft type, of which the double camshaft type of the overhead camshaft has a camshaft (5, 6) installed so that the timing gear operates at half the speed of the crankshaft. , The opening and closing timing of each valve with respect to the rotation of the crankshaft must be exactly matched, and the driving cam 7 is attached to the intake camshaft 5 and the exhaust camshaft 6, respectively, so that the intake bag 3 and the exhaust valve 4 ) Is opened and closed.

In addition, the intake valve 3 is designed so that the intake time is accumulated, and the exhaust valve 4 is designed to be cooled well and to have high durability.

Therefore, the intake valve 3 and the exhaust valve 4 are opened by the drive cam 7 in a very short period of time during which the piston performs one cycle to intake and exhaust to increase the volumetric efficiency, and the two valves 3 In the compression stroke and the power stroke, which are closed with 4), sufficient airtightness should be maintained, and it is satisfied even in the most difficult conditions such as being able to operate correctly even when exposed to high temperature of combustion gas and withstanding long time operation.

However, as described above, the conventional intake valve 3 and the exhaust valve 4 are opened by the drive cam 7 and closed by the valve spring 8, and the valve spring 8 is the engine 1. Since the spring constant is designed to be closed at the highest output of the valve, when the valves 3 and 4 are opened at the low speed of the engine 1, the repulsive force of the valve spring 8 is excessively acting so that The opening degree of the valves 3 and 4 could not be achieved.

In particular, the above-mentioned problem is that the performance of the engine in the combustion chamber is degraded and incomplete combustion causes exhaust gas, which is the main cause of environmental pollution.

Accordingly, the present invention has been made to solve the problems of the prior art, it is an object of the present invention to provide a valve spring auxiliary valve device so that the reaction force of the corresponding valve spring acts when the output of the engine is operated at a low speed. There is this.

The present invention for achieving the above object is connected to the engine speed sensor for detecting the output state of the engine to the input terminal of the electronic control unit, the auxiliary valve device via the solenoid valve via the output terminal of the electronic control unit cylinder It is installed inside the head.

Therefore, the present invention is to install the solenoid valve to prevent the back flow of oil and to install a solenoid valve to control the repulsive force of the spring even in the engine with a large valve inertia force to improve the output and fuel economy.

1 is a perspective view of the structure of a conventional double overhead camshaft engine,

Figure 2 is a schematic diagram of a valve spring auxiliary valve device according to the present invention, (a) is a cross-sectional view of the auxiliary valve device showing when the engine output is low speed, (b) is an auxiliary showing when the engine output is high speed. Cross section of valve device,

3 is a configuration diagram of a valve spring auxiliary valve device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: cylinder head 12: intake valve

13 exhaust valve 14 camshaft

16: drive cam 18: engine speed sensor

20: Electronic control unit (ECU) 22: Solenoid valve

24: valve spring 26: lifter

28: check ball 30: return spring

32: support

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the engine speed sensor 18 for detecting the output state of the engine is connected to the input terminal of the electronic control unit 20, the auxiliary terminal via the solenoid valve 22 to the output terminal of the electronic control unit 20. The valve device is a valve spring auxiliary valve device installed inside the cylinder head (10).

In the auxiliary valve device, the return spring 30 and the check ball 28 are installed inside the conduit to prevent backflow of oil.

2 is a schematic view of a valve spring auxiliary valve device according to the present invention, (a) is a cross-sectional view of the auxiliary valve device showing when the engine output is low speed, (b) is a view when the engine output is high speed. It is sectional drawing of the auxiliary valve apparatus shown.

In the auxiliary valve device according to the present invention, the intake valve 12 and the exhaust valve 13 are opened by the drive cam 16 attached to the camshaft 14, and the valve 12 is opened by the valve spring 24. , 14) is to be closed.

In the report valve device, a valve spring 24 is installed between the cylinder head 10 and the lifter 26, and a space portion is formed to fill the oil above the lifter 26.

In addition, a support 32, a check ball 28, and a return spring 30 are installed at an oil inlet of the space filled with oil, and a solenoid valve 22 is provided at the oil outlet of the space. Attached.

Therefore, when the intake valve 12 and the exhaust valve 13 are opened by the drive cam 16 and closed by the valve spring 24, if the output of the engine is recognized at a high speed, the solenoid valve 22 is operated and the flow path thereof. The narrower and check ball 28 increases the oil pressure by blocking the oil inlet to increase the repulsive force of the valve spring (24).

In addition, when the output of the engine is detected at a low speed, the solenoid valve 22 opens its flow path, and the check ball 28 is restored by the return spring 30 so that the oil pressure of the auxiliary valve device is lowered so that the valve spring 24 The reaction force of the valve spring 24 is controlled at low speed.

Here, the amount of oil flowing into and out of the auxiliary valve device is sensed by the engine speed sensor 18 and sent to the electronic control unit 20, as shown in FIG. 3, the electronic control device 20 is always It is to control the solenoid valve 22 with a signal corresponding to the output of the engine, which varies with the engine.

Therefore, the auxiliary valve device of the present invention is to appropriately control the inertia force of the valve spring 24 at the low speed output of the engine to reduce the friction loss.

As described above, the present invention has the effect of improving the output and fuel economy by installing a check ball that prevents backflow of oil and controlling a repulsive force of a spring even in an engine having a large valve inertia by installing a solenoid valve.

Claims (2)

An engine speed sensor 18 for detecting an output state of the engine is connected to an input terminal of the electronic control unit 20, and an auxiliary valve device via the solenoid valve 22 is provided at the output terminal of the electronic control unit 20. Valve spring auxiliary valve device, characterized in that installed in the cylinder head (10). 2. The valve spring auxiliary valve device according to claim 1, wherein the auxiliary valve device has a return spring (30) and a check ball (28) installed inside the conduit to prevent the backflow of oil.