JPS63106333A - Ignition system for rotary piston engine - Google Patents

Abstract

PURPOSE:To make voltage supply to a spark plug performable with a simple structure, by installing a voltage feeding part terminal are to a side housing, and a voltage receiving part terminal area to a since face in and around each apex of a rotor, respectively, in case of a device which installs the spark plug in each rotor recess part of the rotor. CONSTITUTION:One voltage feeding part terminal 15 is tightly attached to an inner wall of one side of side housings 2a of a rotary engine via an insulating material 13 on a stub axle at the suction-exhaust port side, and connected to an igniter 18 via an external conductor 16. And, each voltage receiving part terminal 20 is tightly attached to a position at one side in and around each apex of a rotor 5 and to be opposed to the terminal 15 in the axial direction via a insulating material 19. In addition, a spark plug 22 is tightly attached to the rotor 5 via an insulating material 23 of each rotor recess part 21 and each spark plug 22 is connected to the voltage receiving part terminal 20 tightly attached to the rotor apex, in the radial direction, to each recess part 21 when the spark plug 22 is situated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ignition device for a rotary piston engine that ignites on the rotor side, and particularly to one in which a spark plug is installed in a rotary recess.

(Prior art) The ignition system of a rotary piston engine has a relative rotation M4
It is installed in either the rotor or the rotor housing, but it is sealed inside the rotor housing in order to install the voltage supply mechanism to the spark plug and to perform maintenance inspections or parts replacement of the built-in mechanism. It is common to avoid the rotor, which performs L rotational movements, and to install the ignition device on the rotor housing side, which can be contacted from the outside and is in a fixed state.

However, in the case where the ignition device is installed on the rotor housing side, it is essential to form a plug hole on the inner wall surface of the rotor housing to accommodate one spark plug, so the apex seal of the rotor passes through this plug hole castle. When doing so, the two front and rear sections divided by the apex seal section
Two working chambers communicate through a plug hole, and the airtightness between the front and rear working chambers is lost, resulting in gas leakage, etc.
The negative pressure in the rear working chamber during the intake process may drop, making it difficult to introduce the necessary amount of air-fuel mixture to ensure good combustibility, or the combustion gas in the front working chamber may flow into the rear working chamber during the combustion process. This has the disadvantage that it can invade the air and cause deterioration of combustibility.

Furthermore, since the position of one spark plug is fixed, the spark plug moves relative to the rotationally moving combustion chamber. Therefore, when adjusting the ignition timing by one ignition timing, etc., there is a problem that it becomes impossible to emit a spark toward the center of the combustion chamber, and the ignition performance becomes 1 g.

On the other hand, when the ignition device is installed on the rotor side, there is no need to form a plug hole in the rotor housing, so problems such as gas leakage do not occur at all, and the ignition plug is connected to the combustion chamber. Because it rotates, it is possible to always send sparks toward the center of the combustion chamber, and the ignition timing is 2gI.
This increases the degree of freedom of adjustment and ensures good ignitability.

For this reason, as disclosed in Japanese Patent Application Laid-Open No. 48-68908,
There is one in which the spark plug is installed in the rotary recess and voltage is supplied to the spark plug through a terminal attached to the eccentric shaft.

However, with the above configuration, it is necessary to configure a voltage supply path within the eccentric shaft.
As the structure of the eccentric shaft becomes more complex,
It is not easy to supply voltage from the outside to the voltage supply path inside the eccentric shaft, which is a rotating body.Furthermore, since the ignition timing is determined by contact between the rotating bodies, the ignition timing may vary depending on the rotational conditions. This poses problems such as the possibility that misalignment may occur.

(Objective of the Invention) In view of the circumstances mentioned in -h, the present invention provides an ignition device for a rotary piston engine that can reliably supply voltage to a spark plug installed in a rotary recess with a simple mechanism. , is its purpose.

(Structure of the Invention) To achieve the above object, the ignition device for a rotary piston engine according to the present invention includes a spark plug installed in each rotary recess of the rotor, and a voltage receiving terminal connected to each spark plug connected to the rotor. The rotor is provided on one side near the apex, and the side housing facing the side surface of the rotor is provided with a voltage sending terminal opposite to the voltage receiving terminal, and the voltage is transmitted through the side housing which is a fixed member. In addition to ensuring a voltage supply path with a relatively simple structure, the ignition timing can be easily determined regardless of the rotor's rotation status.

(Embodiment of the Invention) In the rotary piston engine shown in the second figure, a rotor 5 supported by an eccentric shaft 7 is rotatably fitted in a casing 3 consisting of a rotor housing 1 and a pair of front and rear side housings 2a and 2b. There is.

Each top of the rotor 5 has an apex seal 10.
... is installed, and gas seals 6 are installed on the front and rear sides.
A and an oil seal 6b are respectively attached to keep the three working chambers 31 formed between the vertexes of the rotor 5 in an airtight state. As the rotor 5 rotates, an unburned air-fuel mixture is introduced into each working chamber 31 configured in this manner from the intake bow 11 formed in the side housing 2b, is compressed, and is ignited. When the compressed air-fuel mixture is ignited and burned by a spark blown from the plug 22 (see Figure 5), the exhaust gas after combustion is discharged from the exhaust port 12 formed in the rotor housing 1. There is.

As shown in detail in FIG. 3, one voltage sending terminal 15 is fixed to the inner wall of one side housing 2a via an insulating material 13 on the short axis on the intake/exhaust port side, and an external conductor 16 It is connected to the igniter 18 via. Further, on one side surface near each vertex of the rotor 5, voltage receiving terminals are provided via insulating materials 19, respectively, at positions facing the voltage transmitting terminals 15 fixed to the side housing 2a in the axial direction. 20... are fixed to each rotor recess 21... of the rotor 5, and spark plugs 22... are fixed to each rotor recess 21... of the rotor 5 through an insulating material 23..., as shown in Figure 5. There is. Each spark plug 22 has a first voltage receiving terminal 20 fixed to the rotor apex that is radially opposed to each rotor recess 21 in which the spark plug 22 is located.
As shown in the figure, they are connected by a high voltage cable 25. Thus, for each spark plug, a voltage circuit 111 shown in FIG. As the rotor 5 rotates, the voltage sending terminal 15 of the side housing 2a and the voltage receiving terminal 20 of the rotor 5 connected to each spark plug 22 sequentially face each other, and the voltage circuit is closed. As a result, a voltage supply path is secured, ignition voltage is supplied from the igniter 18, and each spark plug 22 is also sequentially discharged.

Therefore, the voltage receiving terminal 15 fixed to the side housing 2a is not exposed to high-temperature, high-pressure combustion gas, air-fuel mixture, etc., and the durability of the terminal can be improved.

As shown in the first figure, an oil supply passage 26 is formed in the axial direction within the eccentric shaft 7 passing through the rotor 5, and a spark plug 22 within the rotor 5 branches from this oil supply passage 26 in the radial direction. ...A thermopellet 29 is inserted into the injection oil passage 27 through which oil is injected into the vicinity, and is urged by a spring 28 in the direction of blocking the passage 27. When the oil temperature is low, the oil pellets 29 cause the oil temperature in FIG.
) As shown, the injection oil passage 27 is closed and oil injection to the vicinity of the spark plug 22 is stopped, but when the oil temperature reaches 1 level, the injection oil passage 27 is opened with a cross-sectional area proportional to the temperature. Oil is injected and supplied according to the opening area.

With this configuration, the spark plug 22 is strongly cooled when the oil temperature is high, that is, during high-load operation, while cooling is stopped when the oil temperature is low, that is, during light-load operation, depending on the operating condition. Since it is possible to prevent large temperature changes in the spark plugs 22 by cooling the spark plugs 22, it is possible to maintain each spark plug 22 in a stable discharge state at all times, thereby preventing problems such as ignition failure. It is possible.

Note that instead of controlling the amount of oil injected to the spark plug 22 with the thermo pellet 29.

As shown in FIG. 7, a port 32 communicating with the oil supply passage 26 of the eccentric shaft 7 is provided in the regulator valve 31 that controls oil pump oil pressure y1, and when the oil temperature is low, As shown in
Oil injection is stopped by preventing oil from being supplied to the injection oil passage 27 from the port 32, and when the temperature of the oil rises, the regulator valve 3 closes in proportion to the temperature.
1 may be configured such that the opening area of the port 32 is increased to increase the oil injection amount and the 1 spark plug 22 is cooled according to the oil temperature.

(Effects of the Invention) According to the ignition device for a rotary piston engine according to the present invention, a spark plug is provided in each rotary recess, and a voltage receiving terminal is attached to each apex side of the rotor facing the rotary recess. Since one voltage sending terminal is connected to the side housing opposite to the ignition terminal at v2't and NA is established, the voltage is always supplied at a reliable ignition timing at nrtb.

In addition, since voltage can be supplied from the outside through the side housing, which is a fixed member, the pressure supply mechanism can be made relatively simple, and its maintenance, inspection, and component replacement can be done easily. It can be done relatively freely.

Furthermore, since a high voltage is applied between the voltage sending terminal of the side housing and the voltage receiving end f1 of the rotor, even if the terminals do not contact each other directly, if they are weighed against each other with a gap of about 0.51, the discharge will occur. Since the voltage can be supplied, mechanical performance is not required as much and wear on the terminals can be reduced.

[Brief explanation of the drawing]

tJS1 is a cross-sectional view showing an embodiment of the ignition device for a rotary piston engine according to the present invention, FIG. 2 is a partial cross-sectional front view of a rotary piston engine employing the ignition device according to the present invention, and FIG. 4 is a voltage supply circuit diagram, and FIG. 5 is a sectional view of the rotor section in FIG. 1.
-A sectional view and FIGS. 6 and 7 are explanatory diagrams showing an oil supply amount control system for cooling the spark plug. l...Rotor housing 2a, 2b...Side housing 5...Rotor 21...Rotary recess portion 22...
・Spark plug 15... Voltage sending terminal 20... Voltage sending terminal 1st
Figure 7 1 (J Figure 6 Figure 7FgI

Claims (1)

[Claims] In a rotary piston engine having a rotor rotated by an eccentric shaft in a space formed by a rotor housing and a side housing, a spark plug is installed in each rotary recess of the rotor, and a voltage receiving part is connected to each spark plug. An ignition device for a rotary piston engine, characterized in that a terminal is provided on one side surface near the apex of the rotor, and a side housing facing the rotor side surface is provided with one voltage sending terminal facing the voltage receiving terminal.