JPS60201076A - Ignition signal generating mechanism for internal- combustion engine - Google Patents

Abstract

PURPOSE:To shorten the length of the mechanism in the axial direction of a crankshaft by a method wherein a pickup is attached directly to the surface of side wall of a crank case and a recessed notch is provided on the outside surface of disc-type crank web facing to the pickup while the passing of the notch is detected by the pickup under contactless detection. CONSTITUTION:A solenoid pickup 9, for detecting the notch 7a on a crank web 7, is attached to the wall surface of a crank case 3 so as to penetrate it, therefore, the amount of projection of the ignition signal generating mechanism itself from the side surface of the crank case 3 is reduced. Consequently, a body can be inclined into a large angle or the angle of bank can be increased in case the mechanism is mounted on a two-wheeled vehicle and air resistance therefor can be reduced also. The crank web is used both for a rotor, therefore, number of parts may be reduced, attaching error thereof may be reduced accordingly and the detecting accuracy of the pickup may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a non-contact type ignition signal generation mechanism for an internal combustion engine, and more particularly to an ignition signal generation mechanism passed through an internal combustion engine mounted on a motorcycle.

[Prior art]

When mounting a parallel multi-cylinder internal combustion engine on a motorcycle, the cylinders are arranged laterally perpendicular to the direction of travel, and the width of the internal combustion engine, especially the horizontally tilted part of the crankcase in the direction of the crankshaft, is It becomes very prominent.

However, the fact that the sideways portion of the crankcase protrudes to the side of the car body restricts the bank angle when cornering while tilting the car body, and also increases air resistance when driving. It is desirable that the length be as short as possible.

By the way, as shown in FIG. 6, the non-contact type ignition signal generation mechanism provided in the conventional internal combustion engine has an ignition signal generation mechanism attached to the shaft end of the crankshaft 26 that protrudes from the side wall of the crankcase 23. The rotor 27 is fixed so as to protrude, and the electromagnetic pickup 29 is fixed to the outer wall of the crankcase 23 in correspondence with the outer peripheral position of the rotor 27, and furthermore, the electromagnetic pickup 29 and the rotor 27 are both covered from the outside. The cover 30 is attached to the cover 30.

Therefore, this ignition signal generation mechanism is designed to largely protrude from the side of the crankcase 23 of the internal combustion engine in the direction of the crankshaft. Therefore, the bank angle of the above-mentioned two-wheeled motor vehicle is restricted to a small value, and this causes an increase in air resistance.

[Purpose of the invention]

An object of the present invention is to provide an ignition signal generation mechanism for an internal combustion engine that allows the length of the internal combustion engine in the crankshaft direction to be shortened.

[Structure of the invention]

In order to achieve the above object, the ignition signal generation mechanism of the present invention has a number of pink-ups (=J' DJ) directly attached to the side wall surface of the crankcase so as to pass through the side wall surface. A concave notch is provided on the outer surface of the disc-shaped crank web, and the non-contact point is detected by the pickup when the crank web passes through the concave notch.

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

The first bacterium is a motorcycle equipped with an engine 1 having an ignition signal generating mechanism according to the present invention, and the engine 1 is located below a fuel tank 4, and has four cylinders 2. 2. 2.
2 are arranged in parallel in the lateral direction perpendicular to the vehicle traveling direction.

Both sides of the crankcase of the engine 1 only slightly protrude from both sides of the fuel tank 4 in plan view due to the configuration described later.

As shown in the detailed view of FIG. 2, the crankcase 3 is composed of an upper crankcase 3a and a lower crankcase 3b, and the cylinder body 5 provided at the top of the upper crankcase 3a has the four cylinders 2.2,
2.2 is provided. 6 is a crankshaft, and this crankshaft 6 is pivotally supported so as to be sandwiched between an upper crankcase 3a and a lower crankcase 3b. A pair of crank webs 7.7 are formed on the crankshaft 6 at positions corresponding to the respective cylinders 2, and the large end of the communicating rod 8 is connected between the crank webs 7.7. The other end (small end) of this connecting rod 8 is connected to a piston (not shown).

The crank web 7 located at the outermost end of the crankshaft 6 is
Both ends are disk-shaped, and each crank web 7 has a concave notch 7a formed on its outer surface near its outer periphery, as shown in FIG. An electromagnetic pickup 9 is attached to the wall surface of the upper crankcase 3a in correspondence with the position of the notch 7a. electromagnetic pink up 9
generates a voltage change that becomes an ignition signal each time the notch 7a passes as the crank web 7 rotates. Of course, the electromagnetic pink-up 9 may be attached to the lower crankcase 7b side as long as the position A1 corresponds to the notch 7a.

Further, in line with the electromagnetic pink-up 9, a case 10 is fixed so as to cover the end of the crankshaft 6 and straddle both the upper and lower crankcases 3a, 3b. Further, an oil passage 13 is provided in the lower crankcase 3b, and the oil forced into this oil passage 13 is distributed and supplied to each of the five bearing portions of the crankshaft 6.

The electromagnetic pickup 9 is composed of a detection pin 9a and a main body 9b that supports the detection pin 9a. The entire body 9b penetrates the wall surface of the crankcase 3 from the outer surface to the inner surface, and is directly attached to the wall surface, and the central detection pin 9a has an end protruding further inside the crankcase 3. There is. In this case, the inner end surface of the main body 9b may be covered by the wall surface of the crankcase 3, and only the end of the detection pin 9a may be made to protrude inside the crankcase 3, but the detection accuracy of the electromagnetic pickup 9 may be In order to improve the performance, it is desirable to expose both the inner end surface of the main body 9b and the end of the detection pin 9a to the inside of the crankcase 3, as in this embodiment.

When the crank web 7 rotates, the end of the detection pin 9a traces a trajectory as shown in FIG. and generates an ignition signal based on voltage changes.

Further, as shown in FIG. 4.5, a viewing window 11 is provided on the wall surface of the crankcase 3 in correspondence with the outer peripheral position of the crank web 7 at the outermost end, and the viewing window 11 is provided in the radial direction. A protruding needle 11a is formed to protrude from the periphery. Further, this viewing window 11 is provided with a removable screw cap 12 so as to be closed at all times. The above screw cap 12
When you remove it and look through the viewing window 11, you will see the protrusion ti+11 a.
This viewing window 11 allows the rotational position (crank angle) of the crank web 7 to be confirmed through the viewing window 11.
When the crankshaft 6 can be assembled to the crankshaft 3,
It is used for timing alignment with a camshaft for driving intake and exhaust valves (not shown).

The ignition signal generation mechanism provided in the engine 1 described above has a concave notch 7a formed in the side surface of the crank web 7, and this crank web 7 is also used as the rotor of the ignition signal generation mechanism. An electromagnetic pickup 9 for detecting the notch 7a of the crankcase 3 is attached to the crankcase 3.
Since the ignition signal generation mechanism is directly attached to the wall of the crank case 3, the amount by which it protrudes into the sideways portion of the crankcase 3 is reduced, unlike the conventional mechanism shown in FIG.
It doesn't stand out much. Therefore, when mounted on a motorcycle, the vehicle body can be tilted at a large angle, and the bank angle can be increased. Moreover, air resistance can be reduced.

In addition, since the above-mentioned ignition signal generation mechanism uses the crank web 7 as a rotor, the number of parts is reduced compared to the conventional mechanism shown in Fig. 6, and installation errors that occur when installing individual parts are accumulated. can be made smaller. Therefore, an ignition signal generation mechanism with high detection accuracy can be provided.

In addition, since the cover 10 that covers the end of the crankshaft 6 covers only the end of the crankshaft and does not cover the rotor or pink amplifier as in the conventional mechanism shown in FIG. 6, the overall diameter is reduced and its rigidity is reduced. It is possible to improve the performance. Therefore, noise caused by vibrations generated by the cover 10 can be reduced.

In the above embodiment, an electromagnetic pickup is used as the pink-up, but other pink-up may be used instead. In addition, although the above embodiment has been explained in the case of a parallel multi-cylinder engine mounted on a motorcycle, the present invention can also be used for making the engine compact for other purposes.

〔Effect of the invention〕

As described above, in the ignition signal generation mechanism of the present invention, the pink amplifier is directly attached to the side wall of the crankcase so as to pass through the side wall, and the outer side of the disc-shaped crank web facing the pickup is attached to the side wall of the crankcase. A concave notch is provided in the concave notch, and passage through the concave notch is detected by the pickup without contact.Therefore, there is no rotor on the outside of the crankcase as in conventional mechanisms, and the length in the crankshaft direction is It can be made shorter and more compact.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a motorcycle equipped with an engine having the ignition signal generation mechanism of the present invention, Fig. 2 is a vertical sectional view showing the crankcase portion of the engine, and Fig. 3 is the topmost view of the crankshaft of the engine. The crank web provided at the outer end is
Figure 4 is a side view of the crankcase of the same engine as seen from the direction of the ■ arrow in Figure 2.
FIG. 5 is a view taken in the direction of the arrow ■ in FIG. 4, and FIG. 6 is a longitudinal cross-sectional view showing the ignition signal generation mechanism of a conventional engine. 1...Engine, 3...Crankcase, 3a...
・Upper crankcase, 3b...lower crankcase,
6... Crankshaft, 7... Crank web, 7a
...concave notch, 9...electromagnetic pickup,
9a...Main body, 9b...Detection bottle, 10...Cover.

Claims (1)

[Claims] A pink-up is directly attached to the side wall of the crankcase so as to pass through the side wall, and a concave notch is provided on the outer surface of the disc-shaped crank web facing the pink-up. An ignition signal generation mechanism for an internal combustion engine, in which the passage of a non-contact point is detected by the pickup.