KR100481692B1 - Valve activity apparatus for engine - Google Patents

Abstract

The present invention relates to an engine valve driving apparatus, which simplifies the configuration of the valve driving apparatus and eliminates the cylinder head by controlling the opening and closing of the valve through vacuum hydraulic pressure without directly contacting the valve through a cam, thereby improving the output according to the engine weight reduction. Created to achieve fuel efficiency improvement, the valve driving device 2 forms a curved portion 36 at one side section above the central portion, such that the diameter d of the sliding hole 35 including the curved portion 36 has other circular portions. Cam plate 32 having a sliding hole 35 formed a little larger than the diameter (d1) of the, 'T' type cam holder 38 interposed in the main shaft 23 of the driven gear 22 below It is fastened with the camshaft 37 through the cam 33 which slides the sliding hole 35 of the cam plate, and the camshaft 37 is formed on an eccentric part spaced a predetermined distance from the center and one side Operator to plan the action of the hydraulic cylinder 51 on the circumferential surface A cam assembly 30 composed of a cam circle 34 having a concentric receiving groove 40 for accommodating 39 therein,

It consists of a hydraulic cylinder 51 connected to the cam circle 34 and a hydraulic pipe line 53 for transmitting the hydraulic pressure generated in the hydraulic cylinder 51 to the valve housing 52 containing the valves 3 and 3 '. It is characterized by consisting of a hydraulic assembly (50).

Description

Valve activity apparatus for engine

The present invention relates to an engine valve driving apparatus, and more particularly, to an improvement of a valve driving method and apparatus for driving a cylinder valve for sucking a mixer into a cylinder and discharging the combusted exhaust gas to the outside of the cylinder. .

In general, an engine is a device that obtains power by explosive power by mixing fuel and air at a constant ratio and burning it in a cylinder, and is divided into gasoline, diesel, and LPG engine according to the fuel used.

These engines have an intake stroke in which a piston in a cylinder descends and is sucked through a mixture of fuel and air, at which time the intake valve is opened and the exhaust valve is closed.

As the piston rises, the compression stroke-intake valve and exhaust valve, which compress the sucked mixer, close,

The expansion stroke-intake valve and exhaust valve, which generate power by igniting and exploding with compressed electric flame in the compressed mixer and lowering the piston by the pressure of the combustion gas,

As the piston rises, the exhaust stroke, which exhausts the combustion gases, closes the intake valve and opens the exhaust valve.

The engine as described above has intake and exhaust valves for regulating the inflow of the mixer and the exhaust of the combustion gas, respectively, and the intake and exhaust valves are repeatedly opened and closed through a valve drive corresponding to the operation of the piston. Enable smooth driving.

The intake and exhaust valve driving device has a variety of configurations depending on the shape and mounting portion of the drive mechanism, and as shown in FIG. 1, is linked with the crankshaft 12 to drive the valve 11 interposed above the piston 10. A push rod type controlled through a push rod 14 fixed to a cam 13,

Chain type for controlling the sprocket 15 formed on the crankshaft 12 and the sprocket 15 through the cam 16 above the valve 11 as one-belt chain 17 as shown in FIG. Etc. are used.

In particular, as shown in FIG. 2, the cam 16 required for driving the valve 11 has an advantage of being easily rotated at a high speed with an OHC (OverHeadCamshaft) type interposed above the piston 10.

In addition to the above-described configuration, the valve driving device 1 may be interposed between the cams 13 and 16 and the valve 11 in addition to the valve springs for closing the open valve 11. It is formed through many parts such as a valve retainer to facilitate operation.

In addition, each valve 11 including the valve driving device 1 is interposed through a cylinder head for fastening with the cylinder block 18 in which the piston 10 is accommodated.

In the engine configured as described above, the driving of the engine is realized by the action of the piston 10 together with the valve driving device 1. In this process, the engine generates heat energy due to the valve driving device 1 having various configurations. In particular, the valve spring interposed for closing after opening of the valve not only causes valve resistance, but also acted as a cause of operation noise.

In addition, the valve spring is not easy to open and close due to the operation inertia at high speed of the engine, leading to a decrease in power output and economic loss due to increased fuel consumption.

In addition, the cylinder head accommodated the valve and the valve drive device had a problem that it is impossible to erosion of the entire engine mounting space and reduce the engine weight.

Accordingly, the present invention was created to solve the above problems, and by simplifying the configuration of the valve driving device and eliminating the cylinder head by controlling the opening and closing of the valve through vacuum hydraulic pressure without directly contacting the valve through the cam. Its purpose is to improve output and improve fuel efficiency.

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

3 is a partial simplified cross-sectional view showing an engine having an engine valve driving apparatus to which the present invention is applied, FIG. 4 is a partially broken perspective view of the engine valve driving apparatus of the present invention, and FIG. 6 (A, B) will be described together as an operation state view seen from the side of the engine valve driving apparatus shown in FIG.

The driving of the engine valve of the present invention for achieving the above object is a power transmission device composed of each gear and cam connected to the crankshaft, and the opening and closing of the intake and exhaust valves using the vacuum pressure and the working pressure initially set by the power transmission device. To control the lungs.

This engine valve drive device 2,

3 and 4, the engine is mounted in a left-right symmetrical manner, connected to the crankshaft 20 and the driven gear 21 and the driven gear 22 connected to the main gear 21 to generate a driving force; The cam assembly 30 is coupled to operate the hydraulic circuit for controlling the valve drive and the hydraulic assembly 50 for generating a vacuum hydraulic pressure by the action of the cam assembly 30.

The valve driving device 2 formed of the above components is configured independently of each valve 3 and 3 ′ which is responsible for intake and exhaust, and is mounted symmetrically around the piston 23 as shown in the drawing. .

The main and driven gears 21 and 22 which drive the power generation of the valve drive device 2 as described above are formed to have a constant gear ratio, and the number of teeth of the driven gear 22 is significantly higher than that of the main gear 21. Form.

Cam assembly 30 is fastened to the driven gear 22,

The hydraulic cylinder 51 of the hydraulic assembly 50 is interlocked with the cam plate 32 which is mounted and fixed below the engine cylinder block 31, and the cam 33 and cam 33 which slide inside the cam plate 32. It consists of the cam circle 34 which controls.

The cam plate 32 forms a sliding hole 35 for sliding the cam 33 in the center, and the sliding hole 35 is formed to have a circular shape and a curved portion for controlling the valve opening amount in an upper one side section. A diameter d of the curved portion 36 is formed to be somewhat larger than the circular diameter d1 of the sliding hole 35, so that the degree of curvature of the curved portion 36 is greater than that of the valve 3,3 '. The opening time is controlled and the difference g between the diameter d of the curved portion 36 and the circular diameter d1 of the sliding hole 35 controls the opening amount (lift amount) of the valve.

The curved portion 36 controls the opening time of the valve to control the opening portion of the intake and exhaust valves 3 and 3 'by adjusting the interval g and the interval g of the curved portion 36.

The cam 33 sliding the inner diameter of the sliding hole 35 of the cam plate 32 as described above is a cam holder 38 mounted to the tip of the main shaft 24 formed on the driven gear 22 through the cam shaft 37. ) And the inner side of the cam holder 38 is interposed with a bush or a thrust bearing to smoothly lift and lower the cam shaft 37.

The cam shaft 37 forms a 'T' shape and is engaged with the cam holder 38 through the lower side, connected to the cam 33 on one side of the upper side, and a cam circle controlling the hydraulic cylinder 51 on the other side ( 34. A bearing for minimizing the rotational resistance when sliding the sliding hole 35 and the curved portion 36 formed in the cam plate 32 on the fastening portion of the cam 33 and the cam shaft 37. It is further provided.

The cam circle 34 connected to the cam shaft 37 is fixed to an eccentric portion spaced apart from the center by not connecting the cam shaft 37 to the center, and the center P of the cam circle 34 is The cam shaft 37 is fixed to the rear surface of the cam circle 34 fixed to the shaft center P1 of the main shaft 24. Concentric grooves 40 are formed to accommodate the operator 39 to be connected.

The cam assembly 30 configured as described above performs the function of the hydraulic assembly 50 which directly controls the opening and closing of the valves 3 and 3 'by using the rotational force of the main and driven gears 21 and 22.

The hydraulic assembly 50 includes a hydraulic cylinder 51 connected to the cam circle 34 of the cam assembly 30 and a valve housing 52 accommodating hydraulic pressure generated by the hydraulic cylinder 51 to the valves 3 and 3 '. It is composed of a hydraulic pipe line 53 for delivery.

The fluid filled in the components of the hydraulic assembly 50 forms a vacuum pressure, in particular, the valve housing 52 is formed directly above the intake and exhaust ports 41 and 42 of the engine cylinder block 31 to form a cylinder. Allow the head to be deleted.

Of course, the interposition of the sealing material for maintaining the airtightness of the fluid in each of the connecting portion and the operating portion in the hydraulic pipe line 53 and the valve housing 52, including the hydraulic cylinder (51).

Engine valve driving device 2 of the present invention as described above;

By forming the fluid filled in the hydraulic assembly 50 in a vacuum state, each valve (3, 3 ') maintains the initial state in close contact with the intake and exhaust ports (41, 42), the piston 23 with the engine start The crank shaft 20 connected thereto, including the rotating, and at the same time the main, driven gear (21, 22) is rotated to transmit power to the valve drive device (2).

In this way, the rotational force of the engine is transmitted to the cam assembly 30 connected through the driven gear 22 and the main shaft 24, so that the cam shaft 37 and the cam 33 inside the cam holder 38 are cam plate wet. The pupil 35 slides inward.

As described above, the cam 33 can slide the sliding hole 35 because the main shaft 24 rotates at a high speed so that the cam shaft inserted into the cam holder 38 positioned at the end of the main shaft 24 ( The centrifugal force is generated while the 37 rotates together with the main shaft 24. The centrifugal force is generated from the idling state at the same time as the engine starts, and the cam shaft 37 tries to leave the cam holder 38 by the centrifugal force. In addition, the cam 33 provided on the cam shaft 37 can slide in close contact with the sliding hole 35 and the curved portion 36 formed on the cam plate 32. The cam shaft by the centrifugal force 37 is the difference between the diameter d of the curved portion 36 and the rounded diameter d1 of the sliding hole 35 in the curved portion 36 by sliding movement from the cam holder 38 which is slidably coupled. The cam 33 is naturally separated further by) and the curved portion 36 formed in the sliding hole 35 together. Along with the slide of the cam 33, the cam circle 34 connected thereto is also rotated, and the cam circle 34 is eccentric with the cam shaft 37. In the fixed state, but the center P of the cam circle 34 coincides with the center of gravity P1 of the main shaft 24, the cam circle 34 is naturally cam cam 34 by the cam shaft 37. The rotation is based on the center P of the result. Therefore, the operator 39 located in the receiving groove 40 formed in the cam circle 34 has a cam 33 for the origin of the sliding hole 35. When it slides, there is no movement, and when the cam 33 slides the curved part 36, it is pushed upward by the cam circle 34 which moves equally with the cam shaft 37 which moves to the curved part 36 direction. As a result, the rod R of the hydraulic cylinder 51 is raised. The curved portion 36 of the sliding hole 35 formed in the cam plate 32 is thus raised. Movement of the camshaft 37 through the cam circle 34 is connected in the same direction to induce the movement of the operator 39 located in the receiving groove 40 of the cam circle 34. The movement of the operator 39 actuates the rod R of the hydraulic cylinder 51 to pressurize the fluid in the hydraulic pipeline 53 so that the valves 3 and 3 'are opened. ) Is spaced a certain distance by the curved portion 36 of the sliding hole 35 formed in the cam, plate 32, and consequently the operator 39 raises the rod (R) of the hydraulic assembly 50, The valves 3 and 3 'are opened by pressurizing the valves 3 and 3'. The open valves 3 and 3 'are released from the curved part 36 by the cam 33 continuously sliding the sliding hole 35. By returning the cam shaft 37, the cam circle 34, and the operator 39 to their original positions, the pressure applied to the fluid vacuum pressure in the hydraulic pipe line 53 is released. The valves 3 and 3 'are closed. Thus, the opening amount and the opening time of the valves 3 and 3' are related to the degree of curvature of the curved portion 36 formed in the sliding hole 35 of the cam plate 32. Since it is determined by the difference (g) between the diameter (d) of the curved portion 36 and the circular diameter (d1) of the sliding hole 35, it is easy to adjust the engine performance or to set the fuel economy.

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In addition, the valve drive device 2 of the present invention can simplify a large number of complicated components, such as a cylinder head, including a conventional valve drive device, thereby maximizing space utilization in a limited mounting space as well as engine weight.

In addition, by using the vacuum pressure of the fluid instead of mechanical operation for opening and closing of the valve (3, 3 '), the operation noise is significantly reduced, and the inertial performance is minimized to achieve uniform performance at low and high speeds.

The valve drive device of the engine of the present invention as described above can reduce the production cost by simplifying the configuration of the valve drive device for opening and closing of the intake and exhaust valves, eliminating the cylinder head to reduce the engine weight and thereby improve fuel efficiency and It is a useful invention that can achieve a performance improvement.

1 is a simplified perspective view showing an example of a conventional engine,

2 is a simplified cross-sectional view showing another embodiment of a conventional engine,

3 is a partial simplified cross-sectional view showing an engine having an engine valve driving apparatus to which the present invention is applied;

4 is a partially broken perspective view of the engine valve driving apparatus of the present invention;

Figure 5 is a front view showing the intake and exhaust cam plate of the engine valve driving apparatus of the present invention. Figure 6 (A, B) is an operation state seen from the side of the engine valve driving apparatus shown in FIG.

* Description of the symbols used in the main parts of the drawings *

2, valve drive device 21, 22; main, driven gear

3, 3 '; Intake and exhaust valve 30; Cam assembly

32; cam plate 33; cam

34; cam Circle 35; sliding pupil

36; curved part 37; camshaft

38; cam holder 40; receiving groove

50; hydraulic assembly 51; hydraulic cylinder

52; valve housing 53; hydraulic pipeline

Claims (1)

In constructing an engine valve drive device; A main gear 21 connected to the crankshaft 20 to generate a driving force; a driven gear 22 connected to the main gear 21; A cam assembly 30 engaged with the driven gear 22 to operate a hydraulic circuit for controlling valve driving; A hydraulic assembly (50) for generating valve operating hydraulic pressure by the action of the cam assembly (30); The cam assembly 30, Cam including a sliding hole (35) mounted below the engine cylinder block (31) and formed in a round shape, and a curved portion (36) formed so as to control the valve opening amount in an upper side section of the sliding hole (35). Plate 32; A main shaft 24 which is drawn out of the driven gear 22 and penetrates the sliding hole 35 with a cam holder 38 at an end thereof; A cam shaft 37 coupled to the cam holder 38 and slidably moving in the sliding hole 35 direction by a centrifugal force; A cam 33 coupled to the front side of the cam shaft 37 so as to slide the sliding hole 35; A cam circle 34 connected to a rear side of the cam shaft 37; An actuator (39) inserted into a receiving groove (40) formed on the rear surface of the cam circle (34) connected to the cam shaft (37) and connected to a rod (R) of the hydraulic cylinder (51); The hydraulic assembly 50, the hydraulic cylinder 51 is connected to the cam circle 34 and the operator 39; A hydraulic pipeline 53 for delivering the hydraulic pressure generated by the hydraulic cylinder 51 to the valve housing 52 containing the valves 3 and 3 '; The diameter (d) of the curved portion 36 formed in the sliding hole 35 is formed to be somewhat larger than the circular diameter (d1) of the sliding hole 35, so that the diameter (d) and the sliding hole 35 of the curved portion (36). To control the valve opening amount by the difference (g) of the circular diameter d1 of? To control the opening time of the valve to the degree of curvature of the curved portion 36; The cam circle 34 is eccentrically fixed to the cam shaft 37; The center P of the cam circle 34 coincides with the axis center P1 of the main shaft 24 so that the engine valve is rotated about the center P by the cam shaft 37. Drive system.