JPS58101206A - Valve driving method and valve drive gear in internal-combustion engine - Google Patents

Abstract

PURPOSE:To make it possible to control timing of a valve in response to the driving condition by electromagnetically driving the valve. CONSTITUTION:When power is conducted to a first coil 14 and to a second coil 16, the same polar magnetic field is produced on a bearing 17 which is the first polar strip and a second polar strip 15. By repulsion of the both, a valve 13 comes down overpowering resilience of a spring 18, and an air inlet port 12 is opened. When current rate to be supplied to the first coil 14 and to the second coil 16 is reduced, the valve 13 is risen and the air inlet port 12 is closed because of resilience of the spring 18. Thus, opening and closing cycle and lift of the valve can be controlled in response to driving condition of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve driving method and valve driving device for an internal combustion engine such as a Ganlin engine or a Giese μ engine.

Conventionally, for example, in an OHC type valve drive mechanism, as shown in Fig. 1, a valve shaft (3) of a valve (3) is slidably inserted into a cylinder radial part (ca) and opens and closes an intake hole (2). The valve contact portion (6)B of the rocker arm (6) is swung around the rocker shaft (5) by the camshaft (4) at the tip of the rocker arm.
The configuration that touches the is applied. With this configuration, when the camshaft (4) rotates in synchronization with the rotational speed of the internal combustion engine, the rocker arm (6) swings via the camshaft contact portion (6) of the rocker arm (6).

In this way, the valve (3) is lowered through the valve contact part (6)B of the zero puller arm (6), the intake hole (2) is opened, and the valve (3) is opened again.
) bearing (1) and seat (1) of cylinder ledger head part (1)
) The valve (3) is raised by the elasticity of the spring (8) passed between the valve (3) and the air intake hole (2).

As in Jin's example, the conventional valve drive mechanism is a camshaft.

Since it is a mechanical mechanism using power transmission elements such as rocker arms, the number of revolutions of the internal combustion engine and the opening and closing of the valve can only be synchronized at best. It is extremely difficult to adjust. Recently, the relative position between the camshaft and the rocker arm has been moved, and the rocker arm's pivot position has been moved to control the stroke of the rocker arm.
Therefore, attempts have been made to control the lift amount of the valve, but this requires an extremely complicated mechanism to move the camshaft, rocker arm, or rocker arm pivot position, making it impractical. Therefore, at present, it is unavoidable to adapt the valve opening/closing timing and lift amount only to the required characteristics of the specified rotation speed of the internal combustion engine), and in the case of rotation speeds other than the specified rotation speed, Problems such as excessive valve overlap in the low-speed rotation range, a decrease in air-fuel efficiency, and a decrease in engine performance in the high-speed rotation range occur, and smooth matching over the entire engine rotation range is not achieved, resulting in poor engine operating performance. The situation was such that fuel efficiency had to be sacrificed.

The present invention aims to improve the above-mentioned drawbacks of the prior art and to practically adjust the opening/closing timing and lift amount of the valve according to the operating conditions of the internal combustion engine. The main idea is to drive force electromagnetically.

The present invention will be explained with reference to a first embodiment shown in FIG. The valve stem (2) is movably inserted, and the upper end of the valve stem (2) is housed in a casing (B) B extending from a seat (B) A. Inside the bearing is supported by a target. Furthermore, a first coil 1va4 whose iron core is the valve stem (to) is disposed within the casing (b) B, and when the bearing αη is made of a magnetic material such as cast iron, the first coil/ &104, the bearing (b) is magnetized. Therefore, the bearing (b) functions as a first pole piece.

Also, the bearing (b) and the seat of the cylinder head (b) (
A spring O4 is provided between the valve shaft 111 and the valve shaft 111 to bias the valve shaft upward, that is, in the closing direction. Casing (B) B
From inside the earthen wall, there is a second bearing α7) K facing the lower end.
The axis Ql which formed the pole piece (T) is suspended, and the axis (to)
A second coil α with A as the iron core is disposed. Ql is a controller and crank angle sensor 8I.

Engine speed sensor S2. A signal from a sensor 8n detecting engine operating conditions such as a cooling water temperature sensor 83° is inputted, and a controlled amount of current is outputted accordingly to energize the first coil a♦ and the second coil v04. Thus, if the first coil α◆ and the second coil α· are energized to generate a magnetic field of the same polarity in the bearing (B), which is the first pole piece, and the second pole piece OQ, the first pole piece (B) and the second fI
The valve (to) overcomes the elasticity of the spring (to) and descends, opening the intake hole (2).
When the amount of current supplied to the first coil lv (b) and the second coil α→ is reduced, the repulsive force between the 11i piece a″h and the 2nd fi piece (to) and the elasticity of the spring (to) decrease. As the temperature increases, the valve Q [with] rises and the intake hole (b) closes.At this time,
The opening and closing timing of the valve (to) is determined by the first pole piece Q1) and the second pole piece (2).
Since the repulsive force with the spring is determined by the time when it becomes larger than the elasticity of the spring, and the time when it becomes smaller, the first coil Q→ and the second coil /L/ corresponding to the repulsive force
By periodically changing the amount of current supplied by QIK, the timing of opening and closing of the valve (2) can be easily controlled. In addition, the lift amount of the valve (2) is determined by the elasticity of the spring 0 barrel and the first pole piece α.
Since it is determined by the balance between the force, the repulsive force of the second pole piece (to), and the resultant force of the inertia force of valve 03, this is also supplied to the first coil α◆ and the second coil A/Q. easily controlled by the amount of current applied.

One valve (2) is moved by the elasticity of the spring (to) to the intake hole (2).
), it is also possible to provide a buffering effect by appropriately increasing the repulsive force between the first pole piece Qη and the second si piece (to) immediately before the valve α is seated.

Thus, in this embodiment, the opening/closing timing of the valve and the lift amount are controlled by adjusting the current supplied to the first coil μ and the second coil μ in quantity and timing.
The current supplied to the coil and the second coil is controlled by the controller QtJ.
Therefore, the valve opening/closing timing and lift amount are controlled according to the engine operating state.

FIG. 3 shows a second refreshing embodiment. In this case, instead of the bearing Qη in the first embodiment, the first pole piece (support) is the valve shaft (
The spring is attached to the upper end of the column and faces the second pole piece, and the spring is removed.

In this way, when the valve (2) is raised to close the intake hole (6), magnetic fields of different polarities are generated between the first pole piece ■ and the second pole piece Q sieve, and the 11i piece 4 and the second A magnetic attraction is applied between the pole piece (2) and the pole piece (2).

Other than the above embodiments, for example, the 15th Ji! In the example, the first
Remove the carp A/Q◆ and use the spring (to) to
Contrary to the embodiment, the valve (to) is biased downward, and the second
The valve (to) may be lifted by overcoming the elasticity of the spring (to) by magnetically attracting the bearing att of the valve (to) by only the coil and the second pole piece a0. The valve shaft α may be electromagnetically driven by the coil A/ by providing an iron core with a separate coil disposed near the shaft (2).

As described above, the present invention is to electromagnetically drive the intake valve or exhaust valve of an internal combustion engine, which is extremely easy to control. The engine's operating performance and fuel efficiency are improved.

[Brief explanation of drawings]

FIG. 1 is a cutaway front view of the main part of the conventional example, and FIGS. 2 and 3 are the 1st embodiment and the 21st embodiment, respectively. FIG. 3 is a cutaway front view of the main part of the embodiment. In the figure, (To)... Valve, (2) M... Valve shaft, (B)... First coil, Qi9... Second pole piece, O
o...Second coil, αη...Bearing (first pole piece), (Foundation)...Second IfM piece, Q9...Controller, 81,82.83... 8n...Sensor patent applicant! Chikai Koshu Co., Ltd. Faki 1 Sonoki 2 Diagram

Claims (1)

[Scope of Claims] 1. A method for driving a valve in an internal combustion engine, characterized by a valve that electromagnetically drives an intake valve or an exhaust valve of an internal combustion engine. An internal combustion engine comprising a first pole piece, a first coil that magnetizes the first pole piece, a second pole piece that is close to the first pole piece, and a second coil that magnetizes the second pole piece. 4. In the valve drive device according to claim J2KEa, the first coil has the valve shaft as an iron core. 4. In the valve drive device according to claim 42, the second coil The iron core of the coil N is integrally formed with the second pole piece. 1. In the valve driving device according to claim J2.3.4, the valve driving device be controlled by