JPS5979018A - Valve operating device for internal-combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve train capable of stopping the opening and closing operations of an intake valve and/or an exhaust valve of an internal combustion engine.

In recent years, for example, internal combustion engines installed in vehicles have come into practical use in order to save fuel by stopping the opening and closing of the intake and exhaust valves of some cylinders during specific driving conditions. It is provided.

Such a valve train for an internal combustion engine uses a fluid pressure cylinder mechanism, and controls the operation of this fluid pressure cylinder mechanism to stop the opening and closing operations of the intake valve and the exhaust valve.

However, in such known valve operating systems, the responsiveness of the hydraulic cylinder mechanism is poor, resulting in poor operational performance, and there is a risk that air may get mixed into the hydraulic cylinder mechanism.

The present invention has been made in view of the above facts, and its object is to provide an improved internal combustion engine that can prevent air from entering the fluid pressure cylinder mechanism and also improve its responsiveness. We provide complete valve train equipment.

According to the present invention, a rocker arm mounting member, a rocker arm swingably mounted on the rocker arm mounting member, a valve that is opened and closed by swinging of the rocker arm, and a rocker arm mounting member that swings. A valve train for an internal combustion engine, comprising a hydraulic cylinder mechanism for positioning the rocker arm in an operating position and a non-operating position in which rocking of the rocker arm is stopped, and a cylinder control means for controlling the operation of the hydraulic cylinder machine 49ft. The cylinder control means installed in the apparatus includes a fluid pressure supply channel for supplying pressure fluid to the fluid royal chamber of the fluid pressure cylinder mechanism and a fluid pressure return channel for returning the pressure fluid from the fluid pressure chamber. Are the channel opening/closing valves that control the opening and closing of each valve and the rocker arm mounting member in the non-operating position? Equipped with a position detector to detect
When the rocker arm mounting member is positioned in the non-operating position, the fluid pressure return flow path is switched to the open/close valve due to the signal from the hind leg position detector which opens the flow path and is closed. A valve train characterized by the following is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred specific examples of a valve train for an internal combustion engine constructed according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 showing a simplified configuration of the Ij valve device, the entire ? The valve train indicated by number 2 includes a rocker arm 4 . The rocker arm 4 has a rocker arm main body 6 ft in length, and a roller 10 is rotatably mounted approximately in the center of the rocker arm main body 6 via a shaft member 8. An adjustment screw member 12 is screwed onto the tip of the rocker arm body 6, and a fixing nut 14 is screwed onto the adjustment screw member 12vc*. An abutment member 18 that abuts the intake valve 16 is attached to the tip of the adjustment screw member 12 so as to be pivotable in any direction. The rear end portion of this rocker arm main body 6 is connected to a rocker arm mounting member 22 via a shaft member 20.
It is attached so that it can rotate freely.

This rocker arm mounting member 22 is moved vertically in FIG. 1 by a fluid pressure cylinder mechanism 24, which will be described later, and is positioned at the working position # (see FIG. 1) or the non-working position. Further, a camshaft 26 is provided above the rocker arm 4 and is rotatable in relation to the rotation of the internal combustion engine, and a cam 28 is provided on the camshaft 26 . Therefore, when the rocker arm mounting member 22 is positioned at the operating position, the cam 28 comes into contact with the roller 10 of the rocker arm 4, and the rocker arm 4 swings about the shaft member 20, as can be easily understood from FIG. However, the rocker arm mounting member 22 is in the non-operating position b-
When the cam 28 and the roller 10 are positioned in the position shown in FIG.

Next, the fluid pressure cylinder mechanism 24 will be described. The fluid pressure cylinder mechanism @24 includes a cylinder body 32 in which a cylinder portion 30 is formed. This cylinder body 32 is attached to the cylinder head 3 by means of fixing bolts 34.
It is fixed at 6.

A closing member 40 is fixed to the end of the cylinder body 32 by a fixing bolt 38. Cylinder part 30
A piston member 42 is movably disposed inside.
The output end of this piston member 42 is the closing member 401c''R.
The rocker arm mounting member 22 is fixed to the rocker arm mounting member 22 through the rocker arm mounting member 22. Therefore, when the Mc body pressure cylinder mechanism 24 is extended (the piston member 42 moves upward in FIG. 42 is moved downward in FIG. 1), the rocker arm attachment member 22 is positioned in the non-operating position.

This hydraulic cylinder head 24 is connected to the cylinder control means 42.
The operation is controlled by. The cylinder control means 42 includes a fluid reservoir 44, a feed source 46 such as a feed pump, and a flow path opening/closing valve 48. In this specific example, the flow path opening/closing valve 48 is separated from the first solenoid valve 48a and the second solenoid valve 48b. A fluid pressure supply flow passage 50 and a fluid pressure return flow passage 52 are provided between the fluid reservoir 44 and the fluid pressure cylinder mechanism 24, and this fluid pressure supply flow! 50 is provided with a supply source 46, a first electromagnetic valve 48a and a one-way q54, and a fluid pressure return channel 52 is provided with a second electromagnetic valve 48.
b is provided. Therefore, when the first electromagnetic valve 48B is in an open state and the fluid pressure supply passage 50 is opened, the pressure fluid from the supply source 46 passes through the fluid pressure supply passage 501i to the hydraulic cylinder mechanism 24. The fluid pressure chamber 56 is fed to the fluid pressure chamber 56. Further, when the second solenoid valve 48b is opened and the fluid pressure return channel 52 is opened, the pressure fluid in the fluid royal family 56 is discharged to the fluid reservoir 44 through the fluid pressure return channel 52. Ru.

The fluid pressure supply flow path 50 includes a flow path 58 formed in the cylinder head 36, and a fluid pressure return flow path 5.
2 includes a flow passage 60 formed in the cylinder head 36.

The operation of the first solenoid valve 48a and the second solenoid valve 48b is controlled by, for example, a control system illustrated in FIG. In FIG. 2, a rotation speed detector 6 detects the rotation speed of the internal combustion engine.
2, a load signal from a load detector 64 that detects the load state of the internal combustion engine, and a temperature signal from a temperature sensor 66 that detects the temperature of the cooling water of the internal combustion engine, respectively.
The valve control means 68 is fed. The output signals from this valve control means 68 are the electromagnetic solenoid S1 of the first electromagnetic valve 48B and the electromagnetic solenoid S2 of the second electromagnetic valve 48b, respectively.
will be sent to

This valve train 2 further includes a position detector 70 on the end surface (upper surface) of the closing member 40 of the fluid pressure cylinder mechanism 24 for detecting that the rocker arm mounting member 22 is in the non-operating position.
K is arranged. This position detector 70 is composed of a detection means that generates a signal when the rocker arm mounting member 22 is in the non-operating position.
A signal from is sent to the valve control means 68.

Next, the effects of the R20 manufactured by Valve Engine Co., Ltd. having the above-mentioned configuration will be explained.

If the rotational speed of the internal combustion engine exceeds a predetermined rotational speed, if the load condition of the internal combustion engine is medium to high load, or if the temperature of the cooling water of the internal combustion engine is lower than the predetermined temperature,
When the electromagnetic solenoid S□ of the first electromagnetic valve 48a and the electromagnetic solenoid S2 of the second electromagnetic valve 48b become inactive, the first electromagnetic valve 48a becomes open as shown in FIG. The second solenoid valve 48b is closed. Therefore, in such a case, the fluid pressure feed channel 50 is opened, and the pressure fluid from the feed source 46 is fed to the fluid pressure chamber 56 of the fluid pressure cylinder mechanism 24 through the fluid pressure feed channel 50,
The hydraulic cylinder mechanism 24 is expanded by the action of this pressure fluid, and the rocker arm mounting member 22 is held in the working position (the position shown in FIG. 1). Thus, the cam 28, which is rotated in relation to the rotation of the internal combustion engine, comes into contact with the roller 10 of the rocker arm 4, causing the rocker arm 4 to swing, and the intake valve 16 to open and close via the four rocker arms.

On the other hand, when the rotational speed of the internal combustion engine becomes lower than the predetermined rotational speed, the load state of the internal combustion engine becomes low load, and the temperature of the cooling water exceeds the predetermined temperature, the rotational speed from the rotational speed detector 62 (jt An actuation signal is generated in the valve control means 68 due to the load signal from the load detector 64 and the temperature signal from the temperature sensor 66, which actuation signal is sent to the electromagnetic solenoids S□ and s2. When the actuation signal is sent, the electromagnetic solenoids S and S2 are energized, respectively, and the first
When the second solenoid valve 48a is closed, the second solenoid valve 4
8b is in an open state, and the fluid pressure return channel 52 is opened. When opened in this manner, the pressure fluid in the fluid royal family 56 is discharged into the fluid reservoir 44 through the fluid pressure return channel 52.
The hydraulic cylinder machine w24 is contracted by the weight of the rocker arm attachment member 22 and the pressing force accompanying the rotation of the cam 28, and the rocker arm attachment member 22 is positioned at the non-operating position. When the rocker arm attachment member 22 is positioned in the inactive position, a signal is generated in the position detector 70 and the signal is sent to the valve control means 68.

When the signal is sent in this manner, the sending of the actuation signal sent from the valve control means 68 to the electromagnetic solenoid S2 is stopped due to this signal, and the electromagnetic solenoid S2 becomes inactive and the The second solenoid valve 48b is closed. Thus, the rocker arm mounting member 22 is held in the non-operating position, and the intake valve 16 is not opened or closed via the four rocker arms (the opening and closing operation of the intake valve 16 is stopped). In the valve train 2, it is easy to understand from the above description.
As expected, when the rocker arm mounting member 22 is positioned in the non-operating position, the fluid pressure supply flow path 50 and the fluid pressure return flow path 52 are closed, so that these flow paths are activated and the fluid pressure cylinder mechanism 24 Nitrogen can be prevented from entering the fluid pressure chamber 56 of.

In the above specific example, oil for lubricating the internal combustion engine can be used as the pressure fluid, an oil pan of the internal combustion engine can be used as the fluid reservoir 44, and an oil pump can be used as the supply source 46 for supplying lubricating oil to the internal combustion engine. .

Although specific examples of a valve train for an internal combustion engine constructed according to the present invention have been described above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. It is possible.

For example, in the specific example, the flow path opening/closing valve is composed of two electromagnetic valves, but it can also be composed of a single valve member.

Further, in the specific example, the above-mentioned valve train is applied to an intake valve, but it can be applied not only to an intake valve but also to an exhaust valve.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram illustrating the entire simplified fc configuration of a valve train for an internal combustion engine constructed in accordance with the present invention. FIG. 2 is a simplified diagram showing a control system of the valve train shown in FIG. 1. 2...Valve train 4...Rocker arm 16...Intake valve 22...Rocker arm mounting member 24...Fluid pressure cylinder mechanism 42... ...Cylinder control means 48...Flow path opening/closing valves 48a and 48b...First and second solenoid valves 5
0...Fluid pressure supply channel 52...Fluid pressure return channel 56...Fluid pressure chamber 70...Position detection means

Claims (1)

[Scope of Claims] 1. A rocker arm mounting member, a rocker arm swingably mounted on the rocker arm mounting member, a valve that is opened and closed by swinging of the rocker arm, and a rocker arm mounting member that is swingably mounted on the rocker arm mounting member; An internal combustion engine comprising: a hydraulic cylinder mechanism for positioning the rocker arm in an active position and a non-active position in which rocking of the rocker arm is stopped; and a cylinder control means for controlling the operation of the hydraulic cylinder. In the valve operating device, the cylinder control means includes a fluid pressure feeding passage for supplying pressure fluid to a fluid royal family of the fluid pressure cylinder mechanism, and a fluid pressure return flow passage for returning pressure fluid to the fluid royal family. A wave path opening/closing valve that controls the opening and closing of the channels, and a position detector that detects when the rocker arm mounting member is in the non-operating position, and when the rocker arm mounting member is positioned in the non-operating position, A valve operating device characterized in that after the fluid pressure return flow path is opened, the flow path opening/closing valve is switched and closed due to a signal from the position detector. 2. A cam that rotates in relation to the rotation of the internal combustion engine is disposed above the rocker arm, and when the rocker arm mounting member is positioned at the operating position, the rotation of the cam causes the cam to rotate in relation to the rotation of the internal combustion engine. A valve operating system for an internal combustion engine according to claim 1, wherein the rocker arm is made to swing.