KR20170071636A - Apparatus for generating swirl in engine - Google Patents

Abstract

The present invention relates to a swirl forming device for an engine and includes a first cam (11) and a second cam (12) having a short cam stroke and a center cam (13) having a relatively long cam stroke, A first restraining mechanism 51 and a second restraining mechanism 52 for restricting the first swing arm 21 and the second swing arm 22, respectively. The valve lift of the first intake valve 51 and the second intake valve 52 is adjusted according to whether the first swing arm 21 and the second swing arm 22 are engaged with the center swing arm 23, . Therefore, a swirl can be formed in the combustion chamber without providing a separate swirl control valve, thereby improving the combustion performance and reducing the exhaust gas.

Description

[0001] Apparatus for generating swirl in engine [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a swirl forming device for an engine, and more particularly, to an swirl forming device for an engine capable of adjusting and controlling a swirl amount of an intake valve.

In the combustion chamber of the engine, fuel and air are mixed and burned, and the heat energy generated at this time is converted into kinetic energy and the vehicle is driven.

In order to perform combustion with good combustion, that is, with a high combustion efficiency and little generation of exhaust gas (hydrocarbon (HC), carbon monoxide (CO), particulate matter (PM), nitrogen oxide (NOx), etc.) It is important to mix.

Therefore, a vortex is formed in the combustion chamber so that fuel and air can be mixed well. The vortex in the horizontal direction is referred to as a swirl, and the vortex in the vertical direction is referred to as a tumble.

Conventionally, in order to form a swirl in the combustion chamber, each runner of the intake manifold is divided into a straight line and a swirl line, and a swirl control valve is provided on a straight line. Therefore, if the straight line is closed by closing the swirl control valve, air is introduced only through the swirl line, so that the swirl flow is directed and the swirl is formed in the combustion chamber. Such a conventional swirl forming technique is disclosed in Korean Patent Publication No. 10-2000-0025090.

Meanwhile, the swirl control valve has a structure in which a valve plate is installed at each position of a straight line of each runner on a valve shaft installed through all the runners of the intake manifold, and a valve actuator is provided at one end of the valve shaft.

As the valve actuator, a mechanical actuator operated by a negative pressure of an intake manifold or an electrically operated electric motor type actuator is used, and is installed outside the intake manifold.

Therefore, in the conventional swirl-forming apparatus, the space occupied by the valve actuator is large, so that the degree of freedom in layout setting of the engine room is reduced, and the valve shaft and the valve plate not only reduce the suction cross-sectional area of the air but also act as a resistance of the intake flow, , The valve plate collides with the contact surface of the straight port during operation of the swirl control valve, thereby causing operation noise.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a swirl control valve which is capable of forming a swirl without providing a separate valve (swirl control valve) in a runner of an intake manifold, , An intake efficiency is improved, and an operation noise is not generated.

According to another aspect of the present invention, there is provided a cam follower comprising a first cam and a second cam having the same cam stroke, a first swing arm and a second swing arm interlocked with the first cam and the second cam, A first swing arm and a second swing arm, a first swing arm and a second swing arm, a first intake valve and a second intake valve interlocked with the first swing arm and the second swing arm, respectively, and cam strooves provided between the first cam and the second cam, A center swing arm provided between the first swing arm and the second swing arm and interlocked with the center cam, a first restraining mechanism selectively connecting the center swing arm and the first swing arm, And a second restraining mechanism for selectively connecting the second swing arm.

The first and second restraint mechanisms may include a solenoid coil and a connection pin inserted into the solenoid coil and protruding from the solenoid coil according to a current supply direction of the solenoid coil or inserted into the solenoid coil.

The first and second restraint mechanisms are installed in the center swing arm such that the respective connecting pins are directed to the outside of the center swing arm. In the first swing arm, the insertion pin And the second swing arm is formed with an insertion groove into which the connection pin of the second restricting mechanism is inserted.

And a current controller for supplying a current to the solenoid coil of the first and second constraining mechanisms and adjusting a current supply direction.

The current controller receives an operation control signal of the first and second restraint mechanisms from an electronic control unit capable of grasping the operation state of the engine.

The electronic control unit controls both the first restricting mechanism and the second restricting mechanism in a connection pin pulling state to open the first intake valve and the second intake valve at a short valve lift amount by the first cam and the second cam, .

The electronic control unit controls both the first restricting mechanism and the second restricting mechanism in a state of projecting the connection pin so that both the first intake valve and the second intake valve are opened by a long valve lift amount by the center cam.

The connection pin of the first restraining mechanism is protruded and the connecting pin of the second restraining mechanism is pulled in so that the first intake valve opens to a long valve lift amount by the center cam and the second intake valve opens to the second cam The valve is opened by a short valve lift amount.

The connection pin of the second restraint mechanism is protruded and the connecting pin of the first restraining mechanism is pulled in so that the second intake valve is opened to a long valve lift amount by the center cam and the first intake valve is opened to the first cam The valve is opened by a short valve lift amount.

According to the present invention as described above, a swirl can be formed in the combustion chamber without providing a separate swirl control valve in the runner of the intake manifold.

Therefore, since the valve actuator for operating the swirl control valve is not used, it is not necessary to secure a space for installing the valve actuator, thereby making it possible to freely utilize the space. That is, the degree of freedom of engine layout setting is improved.

In addition, since the valve shaft and the valve plate constituting the swirl control valve are not present inside the runner, the intake cross-sectional area is not reduced and the intake resistance is not generated, thereby improving the intake efficiency.

In addition, since there is no valve plate, there is an effect that a collision noise generated when the valve plate operates is not generated.

Further, the present invention can freely change the direction of the swirl by reversing the lift amounts of the two intake valves. Therefore, active mixing of air and fuel is induced to improve the combustion performance, the engine power is improved, and the exhaust gas emission amount is reduced.

1 is a front view of a swirl forming apparatus according to the present invention;
Fig. 2 is a right side view of Fig. 1; Fig.
3 is a plan view of Fig.
4 (a) to 4 (d) are diagrams showing connection states of swing arms for explaining various operating states of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

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

1 to 3 are a front view, a right side view, and a plan view of the present invention, wherein the swirl forming device for an engine according to the present invention comprises a first cam 11 and a second cam 12 having the same cam stroke, The first swing arm 21 and the second swing arm 22 interlocked with the cam 11 and the second cam 12 respectively and the first swing arm 21 and the second swing arm 22 A first intake valve 41 and a second intake valve 42 for opening and closing the intake port of the combustion chamber 1 and a first cam 11 provided between the first cam 11 and the second cam 12, A center cam 13 which is provided between the first swing arm 21 and the second swing arm 22 and has a center cam 13 which is relatively longer than the second cam 12, A first swing arm 23 and a first swing arm 51 for selectively connecting the center swing arm 23 and the first swing arm 21. The center swing arm 23 and the second swing arm 22 are selectively And a second restraining mechanism (42) for connecting.

The first cam 11, the second cam 12 and the center cam 13 are both mounted on the same camshaft 10 and are integrally rotated with the camshaft 10 so that the angle of the nose of each cam Of the camshaft 10 are the same.

As described above, the center cam 13 has a longer cam stroke than the first cam 11 and the second cam 12, so that the valve lift that is guided by the first cam 11 and the second cam 12 The first intake valve 41 and the second intake valve 42 can be operated with a larger valve lift amount than that of the first intake valve 41 and the second intake valve 42. [

The first swing arm 21 and the second swing arm 22 and the center swing arm 23 are both mounted on the same swing arm shaft 20 and all have the same shape (in particular, the shape of the cam contact surface) . However, the swing arms 21, 22, and 23 are installed on the swing arm shaft 20 in a freely rotatable manner. That is, the swing arm shaft 20 is a fixed shaft that does not rotate unlike the camshaft 10, and each of the swing arms 21, 22, and 23 is installed so as to be rotatable independently of each other at the swing arm shaft 20 .

The ends of the first swing arm 21 and the second swing arm 22 are in contact with the upper ends of the first intake valve 41 and the second intake valve 42, respectively.

The first intake valve 41 and the second intake valve 42 are provided with springs 30, respectively. The spring 30 applies a force to the first intake valve 41 and the second intake valve 42 to always move them upward so as to keep the intake port in a closed state.

Therefore, when the camshaft 10 is rotated by the engine operation, the first cam 11 and the second cam 12 are rotated integrally with the camshaft 10 and the first cam 11 and the second cam 12 are rotated, The first swing arm 21 and the second swing arm 22 are rotated up and down about the swing arm shaft 20, respectively.

When the first swing arm 21 and the second swing arm 22 are rotated downward, the first intake valve 41 and the second intake valve 42 are pushed downward, respectively, And the intake air flows into the combustion chamber 1.

When the first swing arm 21 and the second swing arm 22 are rotated upward, the first intake valve 41 and the second intake valve 42 are pushed upward by the restoring force of the spring 30 And the intake port of the combustion chamber 1 is shut off to block the air intake.

The first and second restricting mechanisms 51 and 52 are composed of solenoid coils 51a and 52a and connection pins 51b and 52b located inside the solenoid coils 51a and 52a.

The connection pins 51b and 52b act as a solenoid core so as to protrude to the outside of the solenoid coils 51a and 52a according to the current supply direction of the solenoid coils 51a and 52a,

The first restraining mechanism 51 and the second restraining mechanism 52 are provided inside the center swing arm 23 so that the connecting pins 51b and 52b are connected to the first swinging rim 21 and the second swinging arm 22). That is, the first restraining mechanism 51 is provided so that the connecting pin 51b is directed to the first swing arm 21 and the second restraining mechanism 52 is provided so that the connecting pin 52b contacts the second swing arm 22 Respectively.

The first swing arm 21 and the second swing arm 22 oppose the connection pins 51b and 52b of the first and second restricting mechanisms 52 and 52, And 52b are inserted into the insertion grooves 21a and 22a.

When the connecting pin 51b of the first restricting mechanism 51 is protruded, the connecting pin 51b is inserted into the insertion groove 21a of the first swing arm 21 so that the center swing arm 23 and the first swing arm The connection pin 52b is inserted into the insertion groove 22a of the second swing arm 22 and the center swing arm 23 is inserted into the insertion groove 22a of the second swing arm 22, And the second swing arm 22 are connected to each other.

The first and second restraining mechanisms 51 and 52 are connected to the current controller 60 and are supplied with current from the current controller 60. The current controller 60 is connected to the electronic control unit 70 and determines whether the current is supplied to the first and second restricting mechanisms 51 and 52 in accordance with the control signal of the electronic control unit 70, . The first swing arm 21 and the second swing arm 22 can be freely connected to the center swing arm 23 by controlling the operation of the first and second restraint mechanisms 51 and 52. [ Can be adjusted.

The electronic control unit 70 may be an engine control unit (ECU), and it may be configured to control the flow rate of the electric current such that the gas flow in the combustion chamber suitable for the time is taken into consideration, considering various engine operating conditions such as engine speed, intake air amount, fuel pressure, And controls the operation of the first and second restraint mechanisms (51, 52) through the controller (60).

The function and effect of the present invention will now be described.

The swirl forming apparatus according to the present invention can be operated in the four cases shown in FIG.

4A is a case in which both the connecting pins 51b and 52b of the first and second restricting mechanisms 51 and 52 are controlled to be drawn into the center swing arm 23 . In this case, since the first swing arm 21 and the second swing arm 22 are not constrained to the center swing arm 23, the first swing arm 21 and the second swing arm 22 are operated by the first cam 11 and the second cam 12, do. Since the first cam 11 and the second cam 12 have a shorter cam stroke than the center cam 13, the amount of opening of the first intake valve 41 and the second intake valve 42 at this time, (23), so that intake air having the same small flow rate flows in both intake ports.

4B shows a state in which both the connecting pins 51b and 52b of the first and second restricting mechanisms 51 and 52 protrude from the connecting pin 51b Is inserted into the insertion groove 21a of the first swing arm 21 and the connection pin 52b of the second restraining mechanism 52 is inserted into the insertion groove 22a of the second swing arm 22, Both the swing arm 21 and the second swing arm 22 are connected to the center swing arm 23. Therefore, the first swing arm 21 and the second swing arm 22 are vertically rotated together with the center swing arm 23.

Since the cam stroke of the center cam 13 is longer than that of the first cam 11 and the second cam 12 in this case, the first swing arm 21 and the second swing arm 22 are also engaged with the center cam 13 The vertical turning amount is determined. Therefore, the amount of opening of the first intake valve 41 and the opening degree of the second intake valve 42 is larger than that of the first swing arm 21 and the second swing arm 22, A large amount of intake air flows in the same way.

As described above, the intake air amount into the combustion chamber 1 can be adjusted by opening the intake valves on both sides as small as possible or by opening the intake valves as large as possible. At this time, the swirl flow is not formed in the combustion chamber 1 because the amount of intake air flowing through both intake ports is the same.

4C shows only the connecting pin 51b of the first restraining mechanism 51 so that only the first swing arm 21 is restrained to the center swing arm 23 and the second swing arm 22 is restrained. Is free to the center swing arm 23.

The first intake valve 41 is actuated by the center cam 13 and the second intake valve 42 is actuated by the second cam 12 originally so that the first intake valve 41 is driven by the second cam 12, A larger amount of intake air is introduced into the intake port of the first intake valve 41 than the intake port of the second intake valve 42 in a relatively large amount.

Therefore, a swirling flow is formed in the combustion chamber 1 from the intake port side of the first intake valve 41 toward the intake port of the second intake valve 42.

4D, only the connecting pin 52b of the second restraining mechanism 52 is projected to restrain only the second swing arm 22 to the center swing arm 23 and the first swing arm 21, Is free to the center swing arm 23.

In this state, since the second intake valve 42 is actuated by the center cam 13 and the first intake valve 41 is operated by the first cam 11 as it is, the second intake valve 42 is operated by the first cam 11, A larger amount of intake air is introduced into the intake port of the second intake valve 42 than in the intake port of the first intake valve 41 because the intake valve 41 has a larger valve lift amount than the intake valve 41.

Therefore, a swirling flow is formed in the combustion chamber 1 from the intake port side of the second intake valve 42 toward the intake port of the first intake valve 41.

As described above, the present invention controls the operation of the first restraining mechanism 51 and the second restraining mechanism 52 so that the first swing arm 21 and the second swing arm 22 of the center swing arm 23 are operated By constraining only one swing arm, a swirling flow can be formed in the combustion chamber by forming a stronger intake flow on the intake valve side operated by the constrained swing arm than on the opposite side intake valve side.

As described above, since the swirl is formed in the combustion chamber, the fuel and the air are smoothly mixed to improve the combustion performance, and the exhaust gas is reduced.

As described above, according to the present invention, swirl can be formed without using a separate swirl control valve, the space occupied by the actuator of the swirl control valve can be utilized for other purposes, do.

In addition, since the valve shaft of the swirl control valve and the valve plate are not present inside the runner of the intake manifold, the suction cross sectional area is increased and the intake resistance is reduced to improve the intake efficiency.

Further, since the valve plate is not present, no operation noise of the valve plate is generated.

Further, according to the present invention, the operations of the first and second restraint mechanisms (51, 52) are switched to mutually opposite states, so that the valve lift amounts of the two intake valves can be freely reversed to one large side and one side small . Therefore, the swirl can be formed in a desired direction rather than only in one direction, which can be usefully used to control the flow in the combustion chamber as intended.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: camshaft 11: first cam
12: second cam 13: center cam
20: swing arm shaft 21: first swing arm
22: second swing arm 21a, 22a: insertion groove
23: center swing arm 30: spring
41: first intake valve 42: second intake valve
51: first restraint mechanism 52: second restraint mechanism
51a, 52a: Solenoid coil 51b, 52b: Connection pin

Claims (9)

A first cam and a second cam having the same cam stroke,
A first swing arm and a second swing arm interlocked with the first cam and the second cam, respectively,
A first intake valve and a second intake valve interlocked with the first swing arm and the second swing arm, respectively,
A center cam provided between the first cam and the second cam and having a cam stroke relatively longer than the first cam and the second cam,
A center swing arm provided between the first swing arm and the second swing arm and interlocked with the center cam,
A first restraining mechanism for selectively connecting the center swing arm and the first swing arm,
A second restraining mechanism for selectively connecting the center swing arm and the second swing arm;
And a swirl generator for generating a swirl of the engine. The method according to claim 1,
Wherein the first and second restricting mechanisms include a solenoid coil and a connection pin which is inserted into the solenoid coil and protrudes to the outside of the solenoid coil according to the current supply direction of the solenoid coil or is connected to the inside of the solenoid coil. Swirl forming device. The method of claim 2,
The first and second restraint mechanisms are installed in the center swing arm such that the respective connecting pins are directed to the outside of the center swing arm. In the first swing arm, the insertion pin And the second swing arm is formed with an insertion groove into which the connection pin of the second restraining mechanism is inserted. The method of claim 2,
Further comprising a current controller for supplying a current to a solenoid coil of the first and second constraining mechanisms and regulating a current supply direction. The method of claim 4,
Wherein the current controller receives an operation control signal of the first and second restraint mechanisms from an electronic control unit capable of grasping the operation state of the engine. The method of claim 5,
The electronic control unit controls both the first restricting mechanism and the second restricting mechanism in a connection pin pulling state to open the first intake valve and the second intake valve at a short valve lift amount by the first cam and the second cam, Wherein the swirl amount of the swirl amount of the swirl amount of the swirl amount is calculated. The method of claim 4,
Wherein the electronic control unit controls both the first restricting mechanism and the second restricting mechanism in a state of projecting the connecting pin so as to open both the first intake valve and the second intake valve at a long valve lift amount by the center cam. . The method of claim 4,
The connection pin of the first restraining mechanism is protruded and the connecting pin of the second restraining mechanism is pulled in so that the first intake valve opens to a long valve lift amount by the center cam and the second intake valve opens to the second cam And the valve is opened by a short valve lift amount. The method of claim 4,
The connection pin of the second restraint mechanism is protruded and the connecting pin of the first restricting mechanism is pulled in so that the second intake valve is opened by a long valve lift amount by the center cam and the first intake valve is opened by the first cam And the valve is opened by a short valve lift amount.

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