KR19980064474U - Variable speed valve mechanism of automobile - Google Patents

Abstract

The present invention relates to a variable speed valve mechanism device for an automobile, comprising: a vehicle speed sensor 10 for detecting a speed; and a controller for outputting a predetermined result value processed by an output signal of the vehicle speed sensor 10 as an electrical signal ( 20), the hydraulic pressure regulating valve 30 which constantly applies hydraulic pressure by the output signal of the control unit 20, and the support means 60 formed at the end of the hydraulic pressure control valve 30 is combined with the direction of hydraulic pressure In accordance with the rocker arm shaft 50 is installed so as to move in both directions and the rocker arm 51 of the rocker arm shaft 50 selectively contact the cam shaft 40 so that the closing timing of the intake valve is variable in relation to the speed of the vehicle High speed cam (41) and low speed cam (42) are combined separately, and automatically adjusts the closing time of the intake valve according to the speed of the car, so that the optimum engine performance state can be expected in all situations of low speed and high speed.Variable speed valve mechanism of the vehicle device.

Description

Variable speed valve mechanism of automobile

The present invention relates to a variable speed valve mechanism device of a vehicle, and in more detail, it is possible to expect an optimum engine performance state in all situations of low speed or high speed by automatically adjusting the closing time of the intake valve according to the speed of the vehicle. The present invention relates to a variable speed valve mechanism of an automobile.

The valve mechanism in an automobile is composed of an intake valve, an exhaust valve, a valve spring for keeping these valves normally closed, and a rocker arm, camshaft and cam for lifting the valve. Currently, in the OHC (Over Head Cam Shaft) mechanism that is common, there are an indirect drive type in which a swing swing arm or the like exists between the cam shaft and the valve, and a direct drive type in which the cam shaft directly drives the valve. Among them, the camshaft having intake and exhaust camshafts, in particular, is called DOHC (Double Over Head Cam Shaft).

The conventional main structure of the valve mechanism is shown in FIG. 1, which is a cam shaft 40 'rotated by a gear belt (not shown), a cam 41' coupled to the cam shaft 40 ', and the cam. The roller 52 'is in contact with one side of the 41' and the rocker arm 51 'supported by the rocker arm shaft 50' and the tip of the rocker arm 51 'opposite to the roller 52'. And a valve spring 54 'contacting and opening and closing the valve 53' and providing an elastic force to the valve 53 '.

In the conventional valve mechanism having such a configuration, when the gear belt is rotated by the rotation of the crankshaft, the camshaft 40 'coupled thereto is also rotated. Then, the rocker arm 51 'whose one side is in contact with the cam 41' of the camshaft 40 'is moved up and down by the rotational action of the cam 41'. By periodically applying a force to the valve 53 ', the opening and closing of the valve 53' is performed so that the mixer can be sucked into the cylinder.

On the other hand, Fig. 2 shows the opening and closing timings of the intake valves as the rotation angle of the crankshaft. The intake valves are opened before the intake stroke of the piston, i.e., before the top dead center, and then are closed after the intake stroke, i. This is to fill the cylinder as much as possible with the mixer using the inertia of suction. Here, the rotational speed of the crankshaft is rotated in proportion to the speed of the vehicle, that is, the rotational speed of the engine, and the torque and output of the engine greatly depend on the closing timing of the intake valve. In other words, the engine torque is increased when the intake valve closes to the bottom dead center when the engine rotates at low speed, and the output increases when the intake valve closes from the bottom dead center during the high speed rotation of the engine. The trend is shown. In this figure, IO denotes a time when the intake valve is opened and an IC when the intake valve is closed.

However, in the related art, the closing time of the intake valve is constantly adjusted irrespective of the speed of the vehicle, thereby optimizing the performance of the engine while simultaneously satisfying the high torque required at the low speed of the vehicle and the improvement of the engine power required at the high speed. There is a disadvantage that can not.

The present invention was devised to solve the above-mentioned conventional problems, and automatically adjusts the closing time of the intake valve according to the speed of the car, so that the speed of the car can expect the optimum engine performance in all low and high speed situations. It is to provide a variable valve mechanism device.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the principal part engagement state of the conventional general valve mechanism.

2 is a valve timing diagram showing the opening and closing of the intake valve.

Figure 3 is a block diagram showing the electrical configuration of the variable speed valve mechanism device of the vehicle according to the present invention.

Figure 4 is a state diagram showing the mechanical structure of the variable speed valve mechanism device of the vehicle according to the present invention.

Explanation of symbols on the main parts of the drawings

10: vehicle speed sensor 20: control unit

30: hydraulic control valve 40: camshaft

41: high speed cam 42: low speed cam

50: rocker arm axis 51: rocker arm

52: roller 60: support means

61: spring 62: piston

In order to achieve the above object, a variable speed valve mechanism device for a vehicle according to the present invention includes a vehicle speed sensor for detecting a speed of a vehicle and converting the same into an electric signal and outputting the output signal of the vehicle speed sensor as an input signal. A control unit for converting and outputting a predetermined result value into a constant electrical signal by calculating, storing, and controlling the same; and at least one hydraulic control valve for constantly adjusting hydraulic pressure using the output signal of the control unit as an input signal; A rocker arm shaft coupled to the hydraulic control valve and composed of a piston and a spring to provide hydraulic pressure and a rocker arm shaft coupled to the support means to move in both directions according to the direction of hydraulic pressure, and optionally with a rocker arm of the rocker arm shaft. Cam in contact so that the closing timing of the intake valve varies with the speed of the vehicle It is characterized by including a high speed cam and a low speed cam installed on the shaft.

Hereinafter, the most preferred embodiments will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the variable speed valve mechanism device for a vehicle according to the present invention.

Figure 3 is a block diagram showing the electrical configuration of the variable speed valve mechanism device of the vehicle according to the present invention.

As shown, the electrical configuration of the variable speed mechanism of the vehicle according to the present invention is composed of the vehicle speed sensor 10, the control unit 20 and the hydraulic control valve 30, where the vehicle speed sensor 10 is the output shaft rotation of the transmission It is preferable to use an MRE (Magnetic Resistance Element) rotation sensor used for detecting a vehicle speed for a speed meter by using an electronic pickup sensor for detecting a number or by connecting a rotor to a driven gear driven along the output shaft of the transmission.

On the other hand, the control unit 20 for calculating, storing, and controlling the output signal of the rotation sensor as an input signal is a predetermined electronic control unit (Electronic Control Unit), which is an analog / digital converter and an output on an input interface centering on a microcomputer. The interface is equipped with an analog / digital converter and an amplifier. In addition, the memory of the microcomputer stores predetermined programs and reference data for operating the variable speed mechanism of the vehicle according to the present invention. The signal is converted and output.

In addition, the hydraulic control valve 30 using the output signal of the control unit 20 as an input signal serves to constantly adjust the flow rate according to the speed of the vehicle.

The mechanical configuration of the variable speed valve mechanism device according to the present invention operated by such electrical control will be described with reference to FIG. 4.

First, a plurality of cams are coupled to the camshaft 40 coupled to the crankshaft by a gear belt, which is separated into a high speed cam 41 and a low speed cam 42 and is coupled to each other by a pair. In addition, a rocker arm shaft having a roller 52 of a rocker arm 51 is in contact with one surface of the high speed cam 41 and the low speed cam 42, and the plurality of rocker arms 51 and rollers 52 are coupled to each other. Both ends of the support (60) is coupled to the support means (60) with a built-in spring (61) and a piston (62) to support the rocker arm shaft (50), and also to send hydraulic pressure to the support means (60). The hydraulic pressure control valves 30 are connected to each other so that the hydraulic pressure in the support means 60 changes.

Therefore, the rocker arm 51 can be horizontally moved in a predetermined direction by the control of the hydraulic control valve 30, and the roller 52 of the rocker arm 51 is a high speed cam 41 or a low speed cam 42. It is designed to be operated by selectively contacting with).

Referring to the electrical operation and mechanical operation of the variable speed valve mechanism device of the vehicle according to the present invention having such a configuration as follows.

When power is first applied, the controller 20 finishes the initial environment setting by loading a predetermined program stored in the memory and then initializing all the memory variables in the memory. Then, the control unit 20 detects the speed of the vehicle using the vehicle speed sensor 10 and calls an output signal suitable for the speed in reference data and outputs the corresponding electrical signal to the hydraulic control valve 30.

That is, when the vehicle is a high speed, the hydraulic control valve 30 on the right side in FIG. 4 is opened so that the hydraulic pressure can be provided to the support means 60 on the right side, so that the rocker arm shaft 50 is moved to the left to make the rocker arm ( The roller 52 of the 51 is in contact with the high speed cam 41 of the camshaft 40 to be operated. In this case, the closing timing of the intake valve (not shown) is farther from the bottom dead center, so that the output of the engine is improved, which is matched with the high speed environment of the vehicle, thereby optimizing the performance of the engine.

In addition, when the vehicle is low speed, the hydraulic control valve 30 on the left side is opened in FIG. 4 so that the flow rate flows to the support means 60 on the left side, so that the rocker arm shaft 50 is moved to the right side so that the roller of the rocker arm 51 52 is in contact with the low speed cam 42 of the camshaft 40 to be operated. This results in closer closing of the intake valve at the bottom dead center, which improves the torque of the engine, which is matched with the low speed environment of the vehicle to ensure optimum engine performance.

As described above, the present invention has been described with reference to the above embodiments, but various modifications may be made by those skilled in the art without departing from the scope and spirit of the present invention.

Therefore, the variable speed valve mechanism device for an automobile according to the present invention can automatically adjust the closing timing of the intake valve according to the speed of the vehicle to obtain an optimum engine performance state in all situations of low speed and high speed.

Claims (1)

A vehicle speed sensor 10 for detecting a speed of the vehicle and converting the vehicle into a constant electrical signal and outputting the same; A control unit 20 for outputting the output signal of the vehicle speed sensor 10 as an input signal, converting a predetermined result value into a predetermined electrical signal, and outputting the resultant signal; At least one hydraulic control valve (30) for constant hydraulic control by means of a signal; and a support unit (12) connected to the hydraulic control valve (30) and composed of a piston (62) and a spring (61) to provide hydraulic pressure ( A rocker arm shaft (50) coupled to the support means (60) and installed in such a manner as to move in both directions along the direction of hydraulic pressure; and suction in contact with the rocker arm (51) of the rocker arm shaft (50) selectively A variable speed valve mechanism device for a vehicle, comprising a high speed cam (50) and a low speed cam (42) installed on a camshaft (40) such that the closing timing of the valve is variable in relation to the speed of the vehicle.