JPS5853681A - Engine ignition pulser - Google Patents

Abstract

PURPOSE:To improve the precision of the occurrence time of a pulse signal without particularly making an engine bulky by allowing the clutch outer of a starting overrunning clutch fitted on a crank shaft to work concurrently as a signal rotor. CONSTITUTION:A clutch outer 12 with a signal lug 20 of an engine starting overrunning clutch is fitted on a crank shaft 1, and a pickup coil 21 generating a pulse signal when its front is crossed by the lug 20 is fixed to a crank case 2. The clutch outer 12 is allowed to work concurrently as a signal rotor. Accordingly, the clutch outer 12 concurrently works as the signal rotor with a large diameter, thereby the precision of the occurrence time of the pulse signal can be sufficiently improved, and no signal rotor with a large diameter is required to be specially fitted to the crank shaft, thus the engine is not made bulky.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine ignition balsa that generates a pulse signal for driving an ignition circuit, and in particular a signal rotor that rotates together with the engine crankshaft and a signal rotor that is fixed in place in the crankcase. The present invention relates to a pick-up coil that generates a pulse signal when its front face is crossed by a protrusion of a signal rotor.

In such an ignition balsa, it is necessary to increase the outer diameter of the signal rotor in order to improve the accuracy of the pulse signal generation timing, but it is not possible to specifically install a large diameter signal rotor on the crankshaft. The bulk of the temperature increases, making it undesirable.

Therefore, the present invention aims to improve the accuracy of the pulse signal generation timing without making the engine particularly bulky by making the originally large-diameter clutch outer of the starting overrunning clutch mounted on the crankshaft also serve as the signal rotor. can be increased.

The purpose is to provide a simple and effective method.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. Reference numeral 1 denotes a crankshaft supported by a crankcase 2 of an engine, and its output torque is transmitted to a speed change input shaft (not shown) via primary reduction gears 3 and 4. A cylinder shaft 6 is spline-fitted to the end of the crankshaft 1 adjacent to the outside of the gear 3, and is fixed by a port 7. A flange 8 is integrally provided on the outer end of the shaft 6 to project.

A clutch inner 9 is rotatably supported on the outer periphery of the cylindrical shaft 6 via a needle bearing 10, and a driven gear 11 including a gear and sprocket driven by a starter motor (not shown) is mounted at the inner end of the clutch inner 9. It is formed in one piece.

Further, a clutch outer 12 having an inner diameter slightly larger than the outer diameter of the clutch inner 9 is fitted on the outer periphery of the clutch inner 9 between the flange 8 and the driven gear 11. A clutch roller 14 and a spring 15 that presses the roller 14 toward the shallow side of the wedge groove 13 are accommodated in the wedge groove 13 provided in this manner.

In this way, the clutch inner 9. The clutch outer 12, clutch roller 14, etc. constitute a starting overrunning clutch.

A circular centering recess 16 is provided on the outer surface of the clutch outer 12.
The flange 8 fits into this recess 16 to hold the clutch outer 12 in a concentric position with the clutch inner 9, thereby making the clutch inner and outer 9
, 12 is provided with a specified gap 17 to avoid direct contact between them. The flange 8 and the clutch outer 12 are integrally connected to each other by a pole 18.

Further, the outer peripheral surface and the inner surface of the clutch outer 12 are covered with a cover 19 made of a steel plate, and this cover 19 is attached to the clutch outer 12 by caulking its outer end 19α.
is fixed to. This cover 19 and the flange 8 close the openings at both ends of the wedge groove 13 and prevent the clutch roller 14 from coming off from the wedge groove 13.

As particularly shown in FIG. 2, a signal projection 20 is formed on the outer peripheral surface of the cover 19 by punching from the inside, and a pickup coil 21 that cooperates with the signal projection 20 constitutes an ignition balsa 22. The mounting base 21a is fixed in place on the crankcase 2 with bolts 27.

When the signal protrusion 20 crosses the front surface of the pick amplifier coil 21, it can generate a pulse signal that drives an ignition circuit (not shown).

In order to define the pulse signal generation timing of the pickup coil 21, that is, the ignition timing, the relative positions of the seven flange 8 and the clutch outer 12 in the circumferential direction are determined by fitting positioning pins 25 into their positioning holes 23 and 24. The relative positions of the clutch outer 12 and the cover 19 in the circumferential direction are determined by caulking a portion 19.6 of the side wall of the cover 19 into the bolt hole 28 of the clutch outer 12.

In order to start the engine, when a starter motor (not shown) is activated to rotate the driven gear 11 in the normal rotational direction of the crankshaft 1, the clutch inner 9 moves the clutch roller 14 to the shallow side of the wedge groove 13. Because it guides and bites into the
The clutch roller 14 exerts a wedge action to connect the clutch inch and the outer 9°12. Therefore, the rotational torque of the driven gear 110 is
2 to the flange 8 and the crankshaft 1.
The engine can be cranked and started.

After starting, the clutch outer 12, which rotates together with the crankshaft 1, guides the clutch roller 14 to the deep side of the wedge groove 13 and releases the wedge action of the clutch roller 14, so that the clutch inner and outer parts 9° and 12 The connection is severed. Therefore, the clutch inner 9 can be stopped simultaneously with the stopping of the starting motor.

Furthermore, when the ignition timing arrives as the crankshaft rotates 10 times, the signal protrusion 20, which rotates simultaneously with the rotation of the crankshaft 1, crosses the front surface of the pink-up coil 21 and generates a pulse signal from the pickup coil 21. The ignition circuit is activated and ignition occurs in the combustion chamber of the engine.

As described above, according to the present invention, the clutch outer 12 of the starting overrunning clutch is fixed onto the crankshaft 1 so that it can always rotate together with the crankshaft 1, and a signal is sent to the outer peripheral surface of the clutch outer 12. Since a pick-up coil 21 is fixed to the crankcase 2, which emits a pulse signal when the front side is crossed by the signal protrusion 20, the clutch outer 12 also serves as a large-diameter signal rotor. The accuracy of the signal generation timing can be sufficiently increased, and since the clutch outer 12 is also used as the signal rotor, the pulsar Q structure is simplified and the engine does not become bulky.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part of an engine equipped with a balsa according to an embodiment of the present invention, and FIG. 2 is a perspective view of a portion of the pulsar Ω. 1... Crankshaft, 2... Crank case, 12.
...Clutch outer, 20...Signal protrusion, 21.
...Pickup coil, 22...Written amendment for Ignition procedure (February 25, 1980, Commissioner of the Japan Patent Office Shima 1) Haruki Tono 1, π indication Patent Application No. 153431 2. Name of the invention: Balsa for engine ignition 3. Relationship with the case of the person making the amendment Name of patent applicant: (532) Honda Motor Co., Ltd. 4, Representative
Administrator 〒104 5, Date-specific paper notification of amendment order

Claims (1)

[Claims] A clutch outer (12) of an overrunning clutch for engine starting is fixed on the crankshaft (1), and a signal projection (20) is attached to the outer peripheral surface of this clutch outer (12).
), and a pickup coil (21) that emits a pulse signal when the signal protrusion (20) crosses the front surface.
) is fixed to a crankcase (2) that supports the crankshaft (1), for ignition of an engine.