JPS5912162A - Controller for ignition timing of engine - Google Patents

Abstract

PURPOSE:To obtain spark advance characteristics having no fluctuation and improve durability by a method wherein a movable plate, provided with an ignition timing determining member such as a contact breaker or the like rotatably, is pivoted in accordance with the rotating speed of the rotating shaft and the load condition of the engine. CONSTITUTION:The contact breaker 16, whose contact 16a is opened and closed by the rotation of a cam 11 attached to the rotating shaft 11, is attached to the movable plate 15, supported rotatably in a housing 1 through double bearings 24. The movable plate 15 is pivoted by an electromagnetic effect generated by the rotation of a drive member 20, provided with a plurality of permanent magnets 20a so that the N-pole and the S-pole thereof are positioned alternately on the outer periphery thereof, through a driven member 21 of magnetic substance and gears 23, 26, 27. The movable plate 15 is pivoted by the operation of a vacuum spark advance device 18 having a driving source of suction vacuum corresponding to the load of the engine, for example. The ignition timing may be controlled by the pivoting of such movable plate 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an engine ignition timing control GL device that controls the ignition timing of an engine in accordance with the number of recovered engines.

This conventionally known engine ignition timing control system of Haji will be explained with reference to FIGS. 1 to 3. In the figure, (1
) is a housing fixed to the engine (not shown, the same applies hereinafter), (2) is a bearing metal press-fitted into this housing (1), and (3) is rotatably supported by this bearing metal (2). A rotating shaft driven by the engine, (4) a governor plate fixed to the rotating shaft, (5) a pair of pins erected on the governor plate (4), and (6) this pin (5). ), (7)
is a spring hook fixed to the governor plate (4), (
8) is the above Gapana Kueit (6) and the above spring hook (7)
(9) is a pin protruding from the side opposite to the governor plate (4) of the above-mentioned Gapana Kuite (6), (10) is an elongated hole into which this pin (9) is loosely fitted. Department (
10a), which is fixed to the lower end of the cam (11) in FIG. 1, which will be described later;
A cylindrical cam (12) is rotatably fitted loosely into the signal rotor and is fixed to the upper end of the rotating shaft (3) in FIG. 1 with a screw (13). )
(14) is a fixing plate formed in a substantially disc shape surrounding the cam (11) and fixed to the housing (1); (15) is the 1 m
A movable plate (16) is rotatably supported by (14) and constitutes the first movable grate, and (16) is attached to this movable plate (15) and cooperates with the cam (11) to ignite. This is a conventionally well-known interrupter that constitutes an ignition timing determining member that determines the timing, and contacts (16a) are opened and closed by the rotation of the cam (11), and the -
The current is intermittent. (17) is a power distribution cap that closes one end opening of the housing (1);
) is a pin (19) protruding from the movable plate (15).
), and has a link (18a) connected to the movable plate (15), for example, in response to negative pressure before intake (not shown).
A conventionally well-known vacuum advance ml device that rotates the interrupter (16) and the cam (11) to change the relative positions of the corners.
It constitutes a second rotation means.

In the device configured as described above, when the rotating shaft (3) is rotated by the engine, the cam (11) moves between the governor plate (4), the pin (5), the governor weight (6), and the spring (8). , pin (9), and cam pace (10), so that the contact (16a) of the interrupter (16)
) opens and closes, and the negative current of the ignition coil (not shown) is interrupted. Here, to explain the operation for controlling the ignition timing of the engine, first, in the control operation of the ignition timing according to the rotational speed of the engine, when the rotational speed of the engine is below a predetermined value, the governor weight (6) is biased by the spring (8), so the cam base (1
The position 0), that is, the position of the cam (11) is in the position shown in FIG. 3(A). Next, when the rotational speed of the engine increases, the centrifugal force of the governor weight (6) increases according to the rotational speed, so the governor weight (6) resists the tension of the spring (8). ) and the tension of the spring (8) are balanced. For this reason, the cam (]1) is attached to the rotating shaft () as shown in Fig. 3 CB).
For example, the rotating shaft (3) rotates relative to the rotating shaft (3).
) is in the direction of arrow A, the opening/closing operation of the interrupter (16) will be more advanced than when it is positioned as shown in FIG. 3(A).

Next, in the ignition timing control operation according to the load condition of the engine, the link (18a) of the vacuum advance device (18) is displaced according to the negative pressure in the intake pipe (not shown), so the link (18a) rotates the movable grate (15) via the pin (19), and the interrupter (16) mounted on the movable plate (15) K is rotated relative to the cam (11), To advance or advance the angle.

By the way, an engine is operated continuously by repeating four strokes: explosion, exhaust, intake, and compression.
In the three strokes of intake and compression, the engine receives large energy from the explosion and is driven by its inertia, so the angular acceleration will be significantly different between the compression stroke and the explosion stroke, for example. As a result, the angular acceleration of the rotating shaft (3) connected to the engine fluctuates rapidly in the same way as the engine, and furthermore,
The advance angle characteristics fluctuate significantly due to the inertia of advance mechanisms such as the governor weight (8) and the cam (11). On the other hand, since the advance mechanism is constituted by a rotating body, there is a drawback that the bearing portion, sliding portion, etc. are likely to wear out due to rotational vibration and lack durability.

This invention was made to eliminate the drawbacks of the conventional devices as described above, and by rotating the ignition timing determining member to control the ignition timing according to the rotational speed of the engine, it is possible to advance the ignition timing. An engine ignition system that prevents fluctuations in advance characteristics due to the inertia of the mechanism, improves durability, and also enables control of ignition timing according to engine load conditions by rotating the ignition timing determining member. The purpose is to provide a timing control device.

An embodiment of this invention will be described below with reference to FIGS. 4 to 8. In the figure, (11) is a cam fixed to the rotating shaft (3), (15a) is an arcuate long hole provided in the movable plate (15), and (20) is a cam fixed to the rotating shaft (3). The cylindrical drive member (20a) is a permanent magnet installed near the outer periphery of the drive member (20), and a plurality of permanent magnets are arranged so that N poles and S poles are alternately located on the outer periphery. (21) is a driven member made of a two-stage cylindrical magnetic material whose diameter at one end is larger than that at the other end. It is surrounded and rotatably supported on the rotating shaft (1) via a bearing (22) fitted to the inner periphery of the cylindrical portion on the other end side. (21a) is a conductor installed inside the inner periphery of the cylindrical portion on one end side of the dorigun member (21), (23) is an external gear fixed to the other end of the dorigun member (21), (24)
is an outer ring (24a) fixed to the housing (1), an intermediate ring (24111) constituting the second oJ front plate, and an inner ring (240) provided on the inner periphery of this intermediate ring (241). ), (25) is a gear shaft fixed to the middle Φ ring (241)), (26) is a gear loosely fitted to this gear shaft (25) and the above gear (23)
It's in sync with. (27) is an inner gear which has the above-mentioned upward movable play 1- (15) fixed to the outer periphery of one end, is fitted into the above-mentioned inner ring (24C) and is rotatably supported, and the above-mentioned gear (26)
It's in sync with.

Note that the outer gear (23), the gear (26), and the inner gear (27) constitute a first rotation means. (28)
is a spindle installed upright on the above-mentioned intermediate wheel (241),
It is inserted through the elongated hole (15a). (29) is a spring hook installed upright on the movable plate (15);
) is a spring stretched between the spindle (28) and the spring hook (29). Descriptions of other symbols are omitted as they are the same as those of the conventional device.

To explain the operation of controlling the ignition timing of the engine in the system configured as described above, first, in the control operation of the ignition timing according to the rotational speed of the engine, the permanent A magnetic path is formed such that the magnetic flux generated by the magnet (20a) intersects the conductor (21a) provided in the driven member (21). Therefore, when the rotating shaft (3) is rotated by the engine and the drive member (20) and the driven member (21) rotate relative to each other, the interlinkage magnetic flux of the conductor (21a) changes,
A secondary current (1) is generated in the conductor (21a) due to electromagnetic induction. The magnetic field due to this secondary current (1) and the permanent magnet (
Torque is transmitted to the driven member (21) by electromagnetic action with the magnetic field generated by the outer gear (
23), the gear (26) and the inner gear (27) in the direction of the arrow in FIG. It is transmitted to the movable plate (15) in a direction opposite to the rotational direction. Here, the torque transmitted to the movable plate (15) increases depending on the relative rotation speed between the drive member (20) and the driven member (21), that is, the rotation speed of the rotating shaft (3). When the rotational speed of the shaft (3) is below a predetermined value, the position of the movable plate (15), that is, the intermittent opening (
16) is in the position shown in FIG. 5 due to the tension of the spring (30). Next, when the rotational speed of the engine increases, the torque transmitted to the movable plate (15) also increases as described above, and the movable plate (15), i.e., the interrupter (
16) resists the tension of the spring (30), and the cam (1
It is rotated in the opposite direction to the rotation direction of 1), and the ignition timing is advanced.

In this case, the maximum advance angle amount is determined by the spindle (28) coming into contact with the elongated hole (15a). In addition, as mentioned above, the torque transmitted to the movable play (15) is determined by the rotational speed of the rotating shaft (3), but as with conventional devices, the rotating speed of the rotating shaft (3) fluctuates rapidly. do. However, even if the angular acceleration of the drive member (20) fixed to the rotating shaft (3) changes rapidly like the rotating shaft (3), the driven member (21) will not move due to its inertia.
To generate stable torque without following sudden angular acceleration fluctuations of a drive member (20). Next, in the ignition timing control operation according to the engine load condition, the link (18a) of the vacuum advance device (18) is displaced according to the negative pressure in the intake pipe (not shown), as in the conventional device. The link (
The outer gear (23) and the inner gear (27) rotate (9 ), the movable grate (15) and interrupter (16) are rotated relative to the cam (11), and the ignition timing is advanced or retarded.

In addition, in the above explanation, the cam (11) and the interrupter (15)
Although the explanation has been given in the case of a contact type using a magnet, similar young fruits can be expected in the case of a non-contact type such as a magnet generation type, an electromagnetic modulation type, and a Hall IC type.

This ignition F3A performs the ignition timing control operation according to the engine rotational speed and the ignition timing control operation according to the engine load condition by rotating the ignition timing determining member. Fluctuations in the advance angle characteristics due to the inertial action of the angle mechanism can be reduced, and the advance angle mechanism is not affected by rotational vibrations and has little wear, which has the effect of improving durability.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view showing a conventional device, Fig. 2 is a plan view showing an ignition timing determining mechanism of the conventional device, and Fig. 3 is a diagram showing a centrifugal advance mechanism of the conventional device. FIG. 3B is a plan view showing the Vi over-advanced angle before, and FIG. 3B is a plan view showing the fully advanced angle. Fig. 4 is a cross-sectional front view showing an embodiment (10) of this invention, Fig. 5 is a plan view showing an ignition timing determining mechanism of an embodiment of this invention, and Fig. 6 is an embodiment of this invention. FIG. 7 is a developed view of the outer periphery of a drive member showing an embodiment of this invention, and FIG. 8 is a developed view of the inner lateral side of a driven member showing an embodiment of this invention. In the figure, (3) is the rotating shaft, (11) is the cam, and (15) is the rotating shaft.
) is the movable plate v-), (15a) is the long hole part, (16
) is the interrupter, (18) is the vacuum advance device, (18a) is the link, (20) is the drive member, (20a) is the permanent magnet, (21) is the driven member, (21a) is the conductor, (
23) is an external gear, (24) l'i double bearing, (2
6) is a gear, (27) is an internal gear, (28) is a spindle, (29) is a t/'i spring hook, and (30) is a tin ring. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - (11) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 387-

Claims (1)

[Claims] A rotary shaft that rotates in synchronization with the rotation of the engine, an ignition timing determining member that determines the ignition timing according to the rotation of the rotary shaft, and a movable plate that is rotatably provided with the ignition timing determining member attached thereto. an engine ignition device comprising: a first rotating means for rotating the movable plate of the rotary plate according to the rotational speed of the rotating shaft; and a second rotating means for rotating the movable plate according to the load condition of the engine; Timing control device.