JP2753553B2 - Engine intake control valve device - Google Patents

Description

The present invention relates to an intake control valve device for generating a swirl in a combustion chamber of a horizontally opposed multi-cylinder engine, and more specifically, is divided into two sets on both sides of the engine. Each branch of the intake manifold connected to each combustion chamber is divided into a main passage for high speed and a sub-passage for low speed, and is applied to the intake system where all main passages are opened and closed at the same time according to the engine speed And a related intake control valve device.

(Prior Art) As one of means for improving a combustion state by giving a swirl to an air-fuel mixture supplied to a combustion chamber of an engine, each branch of an intake manifold connected to each combustion chamber is connected to a high-speed main passage. 2. Description of the Related Art There is widely known a technique in which a control valve is installed in a main passage divided into a main passage and a sub passage for a low speed, and the control valve is closed at a low speed to increase the filling efficiency. The control valve has a structure in which a flat valve plate is attached to a valve shaft installed across the main passage, and as described in Japanese Patent Application Laid-Open No. 54-99826, an actuator operated by an intake manifold negative pressure or an actual actuator is used. As described in Japanese Patent Laid-Open Publication No. 58-90337, it is common to open and close the actuator using an actuator composed of a stepping motor.

In a multi-cylinder engine, a valve plate provided in each of the main passages connected to each combustion chamber is attached to a single valve shaft to constitute one control valve, and the valve shaft is rotated by an actuator to form a complete control valve. The main passage is opened and closed all at once. However, in an engine in which the combustion chambers are divided into two groups with the engine center interposed therebetween, such as a V-shaped multi-cylinder engine or a horizontally opposed multi-cylinder engine, each set of combustion chambers Is opened and closed by two control valves. In this case, if two control valves are opened and closed by one actuator, there is a disadvantage that a large rotational force is required and the size of the actuator must be significantly increased.
Further, when the two actuators are individually opened and closed, it is difficult to completely synchronize them, so that the balance of each group is lost, which causes a deterioration in the operability of the engine.

(Problems to be Solved by the Invention) In the V-type multi-cylinder engine, since the branches connected to the two sets of combustion chambers are close to each other, the valve shafts of the two control valves provided in them are actually opened. As disclosed in Japanese Patent Application Laid-Open No. 60-72926, the opening and closing can be easily synchronized by mechanically connecting to the throttle valve shaft.

However, for a horizontally opposed multi-cylinder engine, the branches connected to the two sets of combustion chambers extend far away from each other, and the control valve is installed close to the combustion chamber in consideration of the responsiveness of the engine. In this case, the two control valves will be installed at positions far apart from each other on both sides of the engine, and their valve shafts must be mechanically connected to the throttle valve shaft with a link in view of the layout of the intake pipe system. Can not.

The present invention solves such a problem and provides an intake control valve device having a simple structure that does not cause a swirl state and a sudden change in the intake air amount and does not break the balance of each set with respect to a horizontally opposed multi-cylinder engine. It was invented for the purpose of doing so.

(Means for Solving the Problems) That is, according to the present invention, an opening / closing lever that rotates in conjunction with an accelerator operation at an intermediate position between two control valves, and a first link lever coupled to the opening / closing lever and a first series of rods And a link lever and a second link lever connected by a second connecting rod.The two link levers are provided with a transmission link mechanism that is parallel to each other and can be rotated in the same direction by the same angle. The control valve is arranged symmetrically with respect to the transmission link mechanism, and the control valve lever fixed to the valve shaft of one control valve and the control valve lever fixed to the valve shaft of the first link lever and the other control valve And the second link lever were connected by a connecting rod.
The effective length of each of the two link levers, the effective length of the control lever, and the length of the connecting rod are equal to each other.

(Operation) When the opening / closing lever is rotated in conjunction with the operation of the accelerator, the two link levers rotate while maintaining the parallel state by the same angle in the same direction, and the connecting rod having the same length and the control valve lever having the same effective length. , The two control valves are simultaneously opened to the same opening.

(Example) An example of the present invention will be described with reference to the drawings.

The drawings show an example in which the present invention is applied to a horizontally opposed six-cylinder engine. Air passing through an air cleaner 1 is controlled by a throttle valve 3 of an intake pipe 2 and then reaches a collector 7 of an intake manifold 6. Here, the fuel is distributed to the branches 8 connected to the three combustion chambers 5 arranged on the left and right sides of the engine 4, respectively. The branch 8 is divided into a main passage 9 for high speed and a sub-passage 10 for low speed, and merges immediately before the intake port of the combustion chamber 5. In the present invention, the auxiliary passage
The intake air required at idling and low speeds is sucked by 10 and the air required at medium speeds and high speeds is mainly sucked by the main passage 9. The sub-passage 10 is formed of a sufficiently thin tube or has a throttle. The engine 4 supplies only a small amount of air to the throttle valve 3 as in the embodiment.
From the intake pipe 2 to the branch pipe 12 with the regulating valve 11
Is preferably branched, and each sub-passage 10 is branched from the branch pipe 12.

One valve shaft each across the center of each of the three main passages 9 connected to each set of combustion chambers 5 located on either side of the engine 4
14 are arranged, and a flat valve plate 15 provided in each main passage 9 is provided.
Are attached to the valve shaft 14 to form the control valve 16. Further, the two valve shafts 14 are arranged in parallel on one plane.

A transmission link mechanism 17 is provided at an intermediate position between the two control valves 16. The transmission link mechanism 17 includes an opening / closing lever 20 supported by a support shaft 19 attached to a base 18, and a base
Link levers 22 and 24 respectively supported on two support shafts 21 and 23 attached to 18, a first series lever 25 connecting the opening / closing lever 20 and the first link lever 22, and a first link lever The second link lever 26 is formed by connecting the second link lever 22 and the second link lever 24, and the two link levers 22, 24 rotate in the same direction by the same angle with respect to each other.

The two control valves 16 are arranged symmetrically with the transmission link mechanism 17 interposed therebetween, and a control valve lever is provided at the shaft end of each valve shaft 14.
27 is fixed. The first link lever 22 and one control valve lever 27, and the second link lever 24 and the other control valve lever 27 are connected by connecting rods 28 and 29, respectively. Two link levers 22, 24 and a connecting rod 28,
The fulcrums 30 and 31 connecting the fulcrum 29 and the fulcrum 30 are arranged on a plane parallel to the plane on which the valve shaft 14 is arranged. The length of 28, 29, the effective length of the two link levers 22, 24, and the effective length of the two control valve levers 27 are equal to each other. Further, a portion 22a between the support shaft 21 of the first link lever 22 and the support shaft 32 of the second link lever 26 is parallel to the second link lever 24, has the same effective length, and forms a parallelogram. ing.

The opening / closing lever 20 is connected to a wire 35 different from the wire 34 for the throttle valve 3 operated by the accelerator pedal 33.
Is not rotated, but the throttle valve 3 is opened widely and the engine 4
The opening / closing lever 20 is rotated when the speed is in the middle and high speed rotation range.

When the engine 4 is idling and at a low speed, the throttle valve 3 is in the idle position or the low opening position. At this time, the two control valves 16 are placed in the fully closed position and all the main passages 9 are closed. It flows only through the passage 10 and is supplied to the engine 4 to generate swirl.

When the throttle valve 3 is gradually opened, the wire
35 rotates the opening / closing lever 20 clockwise in FIG. As a result, the first series lever 25 is pushed to the left, and the first link lever
22 is rotated counterclockwise, and at the same time, the second link lever 26 is pulled to the left to rotate the second link lever 24 counterclockwise. The two link levers 22, 24 rotate at the same angle because their effective lengths are equal to each other. Rotate in the direction. At the same time, the second link lever 24 pulls the connecting rod 29 to the left to rotate the control valve lever 27 arranged on the right side of the drawing clockwise. Since the two connecting rods 28 and 29 and the two control valve levers 27 have the same length,
The two control valves 16 are simultaneously opened to the same opening.

In the illustrated embodiment, the two control valves 16 are synchronized with the opening and closing operation of the throttle valve 3 and are opened and closed so as to have an opening corresponding to the opening thereof. The amount of intake air flowing through the main passage 9 also increases or decreases in accordance with the increase or decrease, and the amount of intake air in the main passage 9 is controlled in accordance with the engine speed controlled by the opening of the throttle valve 3.

Since the opening / closing lever 20 is rotated in conjunction with the operation of the accelerator, the throttle valve 3 shown in the figure can be omitted, and the control valve 16 can work as a throttle valve to perform output control with excellent engine responsiveness.

(Effect of the Invention) According to the present invention, a transmission link mechanism that operates in conjunction with an accelerator operation is installed at an intermediate position between two control valves, and is symmetrical to the two link levers that rotate by the same angle in the same direction. Since the two control valves are connected to each other by a connecting rod and a control valve lever of the same length, the main passages of each set of the combustion chambers divided into two sets are completely synchronized to achieve the same degree of opening. It can be opened and closed, and not only does not break the balance of each set, but also a swirl state and a sudden change in the amount of intake air are eliminated, so that stable drivability can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a link mechanism according to the present invention, FIG. 2 is a layout diagram of an intake system of an engine embodying the present invention, and FIG. 3 is a view of the intake system of FIG. FIG. 2 ... intake line, 3 ... throttle valve, 4 ... engine, 5 ... combustion chamber, 6 ... intake manifold, 8 ... branch, 9 ... main passage, 1
0 ... Auxiliary passage, 14 ... Valve shaft, 15 ... Valve plate, 16 ... Control valve, 17
... transmission link mechanism, 20 ... opening / closing lever, 22, 24 ... link lever, 27 ... control valve lever, 28, 29 ... connecting rod, 33 ...
Accelerator pedal, 35… wire,

Claims (1)

(57) [Claims] An intake manifold connected to each of two divided combustion chambers of a horizontally opposed multi-cylinder engine is divided into a main passage for high speed and a sub-passage for low speed. A control valve for opening and closing the main passage is configured such that a valve plate provided in each main passage connected to each set of combustion chambers is attached to one valve shaft, and corresponds to a set of combustion chambers. An opening / closing lever (20) that rotates in conjunction with an accelerator operation at an intermediate position between the two control valves (16); A first link lever (22) connected by a first series of rods (25) and a second link lever (24) connected by this link lever (22) and a second connecting rod (26); Link levers (22,24) are parallel to each other and do not have the same angle A transmission link mechanism (17) that is rotated in the same direction is installed, and the two control valves (16) are arranged symmetrically with respect to the transmission link mechanism (17). Control valve lever (27) fixed to the valve shaft (14) of the control valve (16), the first link lever (22), and the other control valve (16)
The control valve lever (27) fixed to the valve shaft (14) and the second link lever (24) are connected by connecting rods (28, 29), respectively, and the two link levers (22, 2) are respectively connected.
4) Effective length, control valve lever (27) effective length, connecting rod (2
8,29) wherein the lengths are each equal to each other;