KR19980038560A - Valve lift amount control cam structure of rocker arm type vehicle engine - Google Patents

Abstract

The present invention relates to a valve lift amount control cam structure of a rocker arm type vehicle engine, which is inserted into the cam lobe 11 side center portion of the cam 10 and flows up and down a predetermined distance, and has return springs at both end portions 12a. Auxiliary cam lobe (17) (17) is mounted, the oil passage 16 formed at the lower end of the auxiliary cam lobe 12, the oil pressure is supplied to the oil passage 16 and controlled by the control of the ECU 19 It is configured to include a hydraulic pressure supply pipe 14, the valve 15 is installed, the camshaft 13 is accommodated in the hydraulic pressure supply pipe (14). Therefore, since the valve lift amount is changed by adjusting the height of the cam according to the traveling speed of the vehicle, the optimum valve lift amount suitable for the driving region is adjusted.

Description

Valve lift amount control cam structure of rocker arm type vehicle engine

The present invention relates to a cam structure configured to adjust the valve lift amount of a rocker arm type vehicle engine, and in particular, a valve lift of a rocker arm type vehicle engine that is simple in configuration and can change the valve lift amount according to the engine speed. It relates to a quantity control cam structure.

Generally, there are various valve mechanisms for opening and closing valves of a vehicle engine according to the structure and type thereof. The present invention provides an overhead camshaft valve mechanism (camera in which a camshaft is installed on a cylinder head and a cam moves directly to a rocker arm). Camshaft Valve Train).

FIG. 1 is a view schematically showing an engine E part to which the present invention is applied and includes an intake valve 22 for opening and closing an intake pipe 21 through which air and a mixer are introduced, and an exhaust pipe 23 through which exhaust gas is exhausted. Exhaust valve 24 to open and close is shown connected to the rocker arm 20 is driven in accordance with the operation of the cam (10). Unexplained symbol '30' is a piston.

FIG. 5 is a cross-sectional view illustrating in more detail the conventional structure of the intake valve portion in FIG. 1, wherein the rocker arm 20 is in contact with a lobe which is a protrusion of the cam 10 by driving the cam 10. Arm) is started around the rocker shaft 25 and is opened by pushing the valve. That is, the rocker arm 20 is supported by the rocker shaft 25 and installed at the center of the cylinder head. When one side is pushed up by the cam 10, the other end presses the valve stem to intake the valve 22. Will open.

However, the above conventional structure has a constant valve lift amount at all times regardless of the engine speed. Accordingly, a high output of the engine cannot be achieved and a problem arises in that the exhaust gas is increased. As a countermeasure against this, a variable valve system has been provided, but the structure is complicated and there is a problem of workability and cost increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a valve lift amount control cam structure of a rocker arm type vehicle engine that allows a simple configuration and a variable valve lift amount according to an engine speed. There is.

1 is an exemplary view of the application of the present invention,

2 is a perspective view of a cam according to the present invention,

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a state of use of the present invention,

5 is a view illustrating a valve driving structure of a conventional rocker arm type engine.

* Explanation of symbols for main parts of the drawings

10: cam 11: cam robe

12: auxiliary cam lobe 12a: end

13: camshaft 14: hydraulic supply pipe

15: hydraulic control valve 16: flow path

17: return spring 18: locking jaw

19: ECU 20: rocker arm

21: intake pipe 22: intake valve

23 exhaust pipe 24 exhaust valve

30: piston E: engine

In order to achieve the above object, the present invention is inserted into the cam lobe 11 side center portion of the cam 10 is formed so as to flow up and down a predetermined distance and the auxiliary cam lobe with the return spring 17 is mounted at both ends (12a) ( 12), a hydraulic pressure supply pipe 14 provided with a hydraulic pressure control valve 15 provided with a flow path 16 formed at a lower end of the auxiliary cam lobe 12 and supplying hydraulic pressure to the flow path 16 and controlled by the ECU 19. ), And provides a cam lift amount control cam structure of a rocker arm type vehicle engine, characterized in that it comprises a cam shaft 13, the hydraulic supply pipe 14 is accommodated.

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

Figure 2 is a perspective view of a cam according to the present invention, showing a state in which the auxiliary cam lobe 12 is inserted in the center of the cam lobe 11 of the cam 10 is supported on the cam shaft (13).

3 is a cross-sectional view taken along the line AA of Figure 2, the configuration of the present invention is formed so that both ends 12a of the auxiliary cam lobe 12 is formed to stop the engaging jaw 18 of the cam body, between The return spring 17 is attached.

A flow path 16 is formed at the lower end of the auxiliary cam lobe 12, and a hydraulic supply pipe 14 for supplying hydraulic pressure to the flow path 16 is installed at the cam shaft 13. A hydraulic control valve 15 is installed between the hydraulic supply pipe 14 and the flow path 16, and the hydraulic control valve 15 is connected to the ECU 19 so that opening and closing is controlled.

According to the present invention configured as described above, when the hydraulic control valve 15 is opened by the control of the ECU 19 which senses this when the vehicle is driven at high speed, the hydraulic pressure is supplied from the hydraulic supply pipe 14 via the oil passage 16. Accordingly, the auxiliary cam lobe 12 is moved upward from the initial solid line state to the one-dot chain line state as shown in FIG. 4. Therefore, the operation of the rocker arm 20 is additionally performed by the amount of protrusion L in FIG. 3 to increase the lift amount of the intake valve 22.

Of course, at a low speed, when the supplied hydraulic pressure is removed, the auxiliary cam lobe 12 is returned to the original position by the return spring 17 to perform a normal lift operation of the intake valve.

As described above, the present invention adjusts the height of the cam according to the traveling speed of the vehicle to vary the valve lift amount, thereby realizing an optimum valve lift amount suitable for the driving region. Therefore, it is possible to obtain an efficient output state of the engine and to reduce the exhaust gas, and the configuration thereof is simple, so that the amount of valve lift can be adjusted at the labor cost and low cost.

Claims (1)

The auxiliary cam lobe 12 and the auxiliary cam lobe 12 are inserted into the center of the cam lobe 11 side of the cam 10 so as to flow up and down a predetermined distance, and the return springs 17 are mounted at both end portions 12a. A hydraulic pressure supply pipe 14 and a hydraulic pressure supply pipe 14 provided with a hydraulic pressure control valve 15 to supply oil pressure to the oil passage 16 formed at the lower end of the c), and to supply the oil pressure to the oil passage 16 and controlled by the ECU 19. Valve lift amount control cam structure of a rocker arm type vehicle engine, characterized in that it comprises a camshaft (13) accommodated.