JPH08246823A - Multiple electromagnetic plunger type variable valve driving device - Google Patents

Abstract

PURPOSE: To attain a mechanism without a cam shaft and a throttleless mechanism in an intake/exhaust valve driving device for an automobile engine by variably driving an opening/closing timing of the valve, time, a lift amount, shape of a valve lift curve. CONSTITUTION: A cylinder 1 is provided with at least two small-sized electromagnetic plungers 1, operation oil 3, and an actuator 4. A valve 7 and a valve return spring 7 abut against the actuator. Current is carried to an electromagnet 2 of the small-sized electromagnetic plunger for enabling motion of each small- sized electromagnetic plunger. The operation oil is pressurized for pressing the valve 7 through the actuator. Current carrying is stopped for demagnetizing the small-sized electromagnetic plunger, and pressurizing the operation oil is suspended. Therefore, the operation oil around the valve and the actuator is pressed back by the operation of the valve return spring 6. In addition, the small-sized plunger and the valve are pressed back. Variable driving is performed by carrying current or suspending it according to electric command signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening / closing device,
By using valve opening / closing means with multiple electromagnetic plungers, a camshaft-less mechanism without cam drive is provided, and intake / exhaust valve opening / closing timing, opening / closing time,
The valve lift amount can be freely controlled, and a wide variety of engines can be easily realized with a non-throttling mechanism. It improves camshaft drive loss and pumping loss, facilitates fog combustion, and allows full engine rotation. It makes it easy to control the optimum combustion in the range, and obtains torque and fuel efficiency at low speed and high horsepower at high speed.

[0002]

2. Description of the Related Art The conventional timing device for intake / exhaust valves of an automobile engine uses a multi-dimensional cam. It is a device that switches between two cams, low and high speed cam, and a device that performs the phase of the cam. Basically, it is a device that changes the cam peak of an arc cam to change the valve opening and closing.

[0003]

2. Description of the Related Art However, in such a conventional valve timing device, since the variable means holds the cam itself, there is a limit to the simultaneous change of the valve opening / closing timing, opening / closing time, and valve lift amount due to the characteristics of the cam. Optimal valve timing in the entire rotation range and its control are difficult to achieve.

[0004]

In consideration of the above points, a large number of two or more small electromagnetic plungers (electromagnetic hydraulic pistons) 1, hydraulic oil 3, actuators (hydraulic pistons) 4 are installed in a cylinder. By using the valve drive device of the configuration provided in 5, by freely selecting the energizing method for each electromagnet 2, the movable number and the movable timing of each small electromagnetic plunger 1 can be freely controlled and operated. A means for changing the valve opening / closing timing, opening / closing time, valve lift amount, and controlling the valve by using the actuator 4 to freely move the valve by applying a pressure change to the oil 3 and causing the actuator 4 to slide freely. Is.

[0005]

Thus, in the present invention, as shown in FIG. 1, a large number of small electromagnetic plungers (electromagnetic hydraulic cylinders) 1 which are movable by energizing the electromagnet 2 are shown in the cylinder 5 (for the sake of explanation, five groups are shown as five groups). And the hydraulic oil 3 and a valve drive device configured to include an actuator 4 that is movable by the pressure change of the hydraulic oil 3 to change the timing for pushing out the valve 7 and the lift, as shown in FIG. ， Small electromagnetic plunger according to the instruction signal by electronic control (a)
When a current is applied to the electromagnet 2 of No. 2, the small electromagnetic plunger (a) is moved by the arrow B by the force of attraction of the electromagnet 2.
And the pressure is applied to the hydraulic oil 3 in the cylinder 5, and the increase in the pressure of the hydraulic oil 3 causes the actuator 4 to move by the amount of the pressure of the volume pushed out by the small electromagnetic plunger (a), indicated by the arrow D. Move in the direction. On this principle, when the electromagnet 2 of the small electromagnetic plunger (b) is energized next, the small electromagnetic plunger (b) moves in the direction of the arrow B to the hydraulic oil 3 in the cylinder 5 by the amount of the pushed out volume. When the pressure increase is applied, the actuator 4 further moves in the direction of arrow D, and when the electromagnet 2 of the small electromagnetic plunger (C) is energized, the small electromagnetic plunger (C) moves in the direction of arrow B, When the pressure increase corresponding to the pushed-out volume is applied to the hydraulic oil 3 in the cylinder 5, the actuator 4 moves further in the direction of the arrow D. Then, when the electromagnet 2 of the small electromagnetic plunger (d) is energized, it becomes small. The electromagnetic plunger (d) moves in the direction of the arrow B, and the pressure increase corresponding to the pushed volume is applied to the hydraulic oil 3 in the cylinder 5, so that the actuator 4 is further moved by the arrow. Direction, and when the electromagnet 2 of the small electromagnetic plunger (e) is energized, the small electromagnetic plunger (e) moves in the direction of arrow B, pushing into the hydraulic oil 3 in the cylinder 5 the volume By increasing the pressure of
The actuator 4 further moves in the direction of the arrow D, and the sliding of the actuator 4 causes the valve 7 to move in the direction of the arrow F. This means that by controlling the energization timing, the energization interval, and the number of energizations of the electromagnet 2 of the small electromagnetic plunger 1, the valve opening timing and the valve opening time by the valve 7
This enables flexible control of the valve opening lift amount, making it easy to select an infinite number of valve opening patterns.

The method of closing the valve by the valve 7 is to turn off the electric power to the electromagnet 2 of each small electromagnetic plunger 1 so that the force for pushing the hydraulic oil 3 in the direction of arrow B by the small electromagnetic plunger 1 is applied. By the force of the valve return spring 6 that pushes back the valve 7 and the actuator 4, the volume of the small electromagnetic plunger 1 pushed out by the demagnetization of the small electromagnetic plunger 1 by the electromagnet 2 is lost. Due to the pressure decrease, the valve 7 returns in the direction of arrow E, and at the same time the actuator 4 also returns in the direction of arrow C, so that the hydraulic oil 3 is pushed back by the actuator 4, and the demagnetized small electromagnetic plunger 1 Through arrow A
Push back in the direction of. Based on this principle, the power-off timing and power-off to the electromagnet 2 of each small electromagnetic plunger 1 are turned off.
By controlling the interval, the valve closing timing and closing time by the valve 7 can be freely controlled. The lift amount is controlled by controlling the number of movements by turning on the energization. The operation of turning on and off the energization makes it possible to change the shape of the lift curve, making it easy to select an infinite number of valve closing patterns. By selecting such a valve opening / closing pattern, it is used for opening / closing the intake and exhaust valves of the engine. Due to the instant movement of each small electromagnetic plunger 1,
By transmitting the lift transmission to the actuator 4 to the hydraulic oil 3, smooth variable transmission can be achieved, jumps and bounces can be reduced, and continuous variable from valve stop to maximum opening and closing can be controlled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a multi-electromagnetic plunger type of the present invention. It is a summary explanatory drawing of the principal part of a variable valve drive device. Figure 2
Energizes the electromagnet 2 of (a) and (b) of the small electromagnetic plunger 1 in FIG. 1, moves in the direction of arrow B, slides in the direction of arrow D of the actuator 4, and moves the valve 7 in the direction of arrow. It is operation explanatory drawing pushed out to F. The numbers, sizes and shapes of the small electromagnetic plungers 1 and electromagnets 2 in each figure, the respective mounting positions and angles, the sizes and shapes of the actuator 4 and the cylinder 5 constituting them, and the respective mounting positions and angles. The size and shape of the valve 7, the valve return spring 6, etc., and the mounting position and angle of each, vary depending on each engine and other purpose of specification, and the energizing line and path to the electromagnet 2 of the small electromagnetic plunger 1 and the electronic path. Instruction signals for control, transmission means, hydraulic oil pressure adjusting system and path are omitted for convenience of explanation.

The small electromagnetic plunger 1 shown in FIG.
Although it is an array of 5 units in the figure, it is a summary diagram for convenience of explanation, and in implementing it, by reducing the size of the small electromagnetic plunger 1 and increasing the number, the pushing pressure can be reduced and a small voltage can be achieved. It becomes possible to move, and it becomes a more flexible and smooth variable valve drive. Also, single time (instantaneous)
In addition, when the valve is opened and closed by energizing the electromagnet 2, the lift curve that pushes out the valve becomes a quadrangle, the effective valve opening area is increased, and the volumetric efficiency is expected to increase. The camshaft-less mechanism eliminates restrictions on the combination of the camshaft and valve in the cylinder head, and allows the intake and exhaust manifold shapes to be relatively free, which is expected to reduce intake and exhaust resistance. In the figure, the valve is directly attached to the cylinder head to move directly, but because there is no restriction on the configuration with the camshaft, a hydraulic pipe is used to extend between the valve and the variable valve drive device, and It is easy to operate the valve opening and closing from other positions. In the process of driving the valve in the implementation, the pressure of the hydraulic oil 3 in the cylinder of the variable valve driving device is adjusted so that the pressure does not drop below the normally set pressure. Try not to be.

[0009]

According to the present invention, the conventional cam profile transmission method of pushing back the valve is instructed to turn on and off the energization to the electromagnets of a large number of small electromagnetic blankers (electromagnetic hydraulic pistons) by electric signals. By moving the valve and opening and closing the valve by means of a device that changes the opening and closing of the valve through hydraulic oil, the camshaft and the belts and chains that drive the camshaft are not required, resulting in a complete camshaftless mechanism. By eliminating the drive loss, the thermal efficiency is dramatically improved. In addition, there is no restriction on the configuration of the camshaft and valve in the cylinder head, and the intake and exhaust manifold shapes are relatively free, which reduces intake and exhaust resistance, and is expected to improve volume efficiency. In addition, the shape of the cylinder head can be changed by making it easy to operate the valve opening and closing from other positions than the cylinder head. By opening and closing the valve through hydraulic oil, jump and bounce fist movements can be reduced. By controlling the movement of a large number of small electromagnetic blankers freely by an electric instruction signal, it becomes a complete throttleless mechanism, which reduces pumping loss and eliminates the complicated causal relationship with the valve due to the cam lift of the arc cam and the cam profile. The lift curve shape can be freely selected, which is not possible in the past, and the volumetric efficiency can be improved by the distance type lift and the volumetric efficiency can be improved by increasing the lift amount. This means that the low speed torque can be increased. And low fuel consumption, NOx
It is also intended to reduce the power consumption and increase the inhalation effect in a high rotation range to obtain high horsepower.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a main part of a multi-electromagnetic plunger type variable valve drive device of the present invention.

FIG. 2 energizes the electromagnets 2 (a) and (b) of the small electromagnetic plunger 1 of FIG. 1 to move in the direction of arrow B, and the hydraulic oil 3 causes the actuator 4 to move in the direction of arrow D. It is an operation diagram with the aim of sliding.

[Explanation of symbols]

 1 Small Electromagnetic Plunger (Electromagnetic Hydraulic Piston) 2 Electromagnet 3 Hydraulic Oil 4 Actuator (Hydraulic Piston) 5 Cylinder (Variable Valve Drive) 6 Valve Return Spring 7 Valve 8 Cylinder Head (Engine) 9 Manifold

Claims (1)

[Claims] 1. A large number of small electromagnetic plungers (electromagnetic hydraulic pistons) 1 are provided, and the electromagnets 2 of the small electromagnetic plungers are arranged in the order, intervals and number according to the electronic control instruction at the valve opening timing. Energize each one and individually
The hydraulic oil 3 in the cylinder 5 to apply a pressure corresponding to the movable volume of each small electromagnetic plunger 1 to the hydraulic oil 3
In order to increase the pressure continuously, the actuator (hydraulic piston) 4 is pushed forward by sliding the pressure increase amount. This operation pushes the valve 7 with the actuator 4. As a result, the conventional arc cam enables valve opening operation similar to the valve lift curve. When the valve is closed, the electromagnet 2 is de-energized and degaussed continuously in the order and at intervals according to the command signal to reduce the pressure continuously applied to the actuator 4 by the hydraulic oil 3. The valve return spring 6 The actuator 4 pushes back the hydraulic oil 3 and the small electromagnetic plungers 1 are pushed back to their original positions. The actuators 4 also return to their original positions and the valve 7 closes. Become. As a result, the conventional arc cam can be used to close the valve, similar to the valve lift curve. 2 above
A large number of small electromagnetic plungers 1 or more and hydraulic oil 3
And the actuator 4 inside the cylinder 5,
Turning on and turning on the electromagnet 2 of each small electromagnetic plunger
By controlling the movable timing of each small electromagnetic plunger 1 by FF control, the opening / closing timing and time are determined, and the valve lift amount is determined by controlling the number of movements.
A pressure change is applied to and the actuator 4 is slid.
As a result, the valve opening / closing timing, time, and lift amount of the valve 7 are freely variable, and the shape of the valve lift curve is also variable.
Multiple electromagnetic plunger type variable valve drive.