JPS63154861A - Starting device for internal combustion engine - Google Patents

Abstract

PURPOSE:To facilitate control of starting, to simplify structure, and to reduces a cost, by a method wherein through rotation in the direction of starting of a pinion shaft, a pinion boss is threadedly joined through a screw threaded in a direction in which it approaches a starter driven gear. CONSTITUTION:A pinion boss 18, threadedly joined with a pinion shaft 15 through a helical spline angagement 19, threaded in a direction in which it approaches a driven gear shaft 17, formed integrally with a crank shaft 2, through rotation in the direction of starting of a pinion shaft 15, is provided. A starter pinion gear 28 is threadedly joined with a pinion boss 18 through a helical spline engagement 29 threaded in a direction reverse to that of the helical spline engagement 19. Through rotation in the direction of starting a cell starter motor 12, the pinion shaft 15 is rotated, and the pinion boss 18 is forced to approach the driven gear 17 to engage the starter pinion gear 28 with the driven gear 17. This constitution enables automatic coupling of the cell starter motor 12 to an internal combustion engine 1 to start the engine.

Description

Detailed Description of the Invention Countermeasure - Standing plate and 1 The present invention provides a system in which when the starter pinion gear is moved in the axial direction by the rotation of the cell starter motor in the starting direction, the starter pinion gear is automatically screwed into the starter driven gear integrated with the crankshaft. Then, the internal combustion engine is started, the starter pinion gear is moved in the opposite direction by stopping rotation of the cell starter motor, and the screw engagement between the starter pinion gear and the starter driven gear is automatically performed. The present invention relates to a starting device for an internal combustion engine that allows the engine to escape.

The inner part of the one-way clutch is fitted with a helical spline to the pinion shaft connected to the rotating shaft of the starter motor, and the pinion gear is installed on the outer part of the clutch. ! At one time, the inertia of the one-way clutch and pinion gear moves the pinion gear in the axial direction, and the pinion gear is screwed into the starter pinion gear that is integrated with the crankshaft. 60
(Refer to Publication No. 30363).

In such an inertia sliding type starter, the pinion gear can be automatically screwed into the starter driven gear simply by rotating the cell starter motor without requiring any screwing operation means, and the internal combustion If the cell starter motor is stopped after starting the engine, the screw engagement between the starter driven gear V and the pinion gear can be automatically avoided, so the starting operation is simple and the structure is simple.

-However,
When the internal combustion engine is cranked by the rotation of the starter motor, the piston rapidly accelerates downward due to the pressure of the compressed intake air in the cylinder while the piston passes the top dead center and heads toward the bottom dead center. If the circumferential speed of the starter driven gear momentarily exceeds the circumferential speed of the starter pinion gear, the pinion gear may move in the opposite direction due to the helical spline between the inner part of the one-way clutch and the pinion shaft, and become disengaged from the starter driven gear. If such a phenomenon occurs, the internal combustion engine may not start smoothly.

In order to eliminate such inconveniences, there is a proposed method described in Japanese Patent Application Laid-Open No. 47-35705@, but this starting device connects the inner of the one-way clutch before starting and stopping the starter motor. Since an electromagnet for engaging and disengaging the lever must be provided on the integrated toothed disk, the structure becomes complicated and the starting operation of the internal combustion engine becomes complicated.

. The present invention is a development of an internal combustion engine that overcomes these difficulties.
Regarding the improvement of the device, the pinion shaft is connected to the pinion shaft driven by the rotation of the cell starter motor through a screw cut in a direction in which rotation of the pinion shaft in the starting direction approaches the starter driven gear that is integrated with the crankshaft. A cell starter By rotating the motor in the starting direction, the pinion shaft is rotated, the pinion boss screwed onto the pinion shaft approaches the starter driven gear, the pinion gear on the pinion boss is screwed onto the starter driven gear, and the crankshaft is rotated. can be used to start the internal combustion engine.

When the internal combustion engine is started and continues to rotate in this way, when the rotation of the pill starter motor is stopped, the pinion boss moves in the opposite direction, the pinion gear is disengaged from the starter driven gear, and the internal combustion engine and cell starter motor are separated. connection is severed.

In addition, when the pinion gear is screwed to the starter driven gear and the internal combustion 1121 is being cranked by the power of the cell starter motor, the force of the intake air in the cylinder and the explosion of the combustion gas are generated while the piston moves toward the top dead center. If the circumferential speed of the starter driven gear exceeds the circumferential speed of the pinion gear due to pressure, the pinion gear will move relative to the pinion boss in the opposite direction to the movement of the pinion boss as the cell starter motor rotates, causing over-rotation of the starter driven gear. is temporarily absorbed, and the pinion gear V maintains a threaded relationship with the starter driven gear.

One embodiment of the invention shown in the drawings will be described below.

The internal combustion engine fI11 of this embodiment is a gasoline engine mounted on a small motorcycle, and its crankshaft 2 is rotatably supported on a crankcase 3 via a bearing 4.
A fixed pulley 6 of a belt transmission automatic transmission 5 is integrally fixed to one end thereof, and a starter driven gear 7 is formed around the outer periphery of this fixed pulley 6.

Furthermore, in the belt transmission automatic transmission 5, a belt 9 is spanned between the fixed pulley 6 and the movable pulley 8 and a driven boolean on the rear wheel side (not shown), and the fixed face 10 integrated with the crank@2 and the movable pulley 8 A weight 11 is interposed on the outer surface of the crankshaft, so that when the crankshaft 2 is stopped or at low speed, the gear ratio is large, and when the crankshaft 2 exceeds a certain rotation speed, the gear ratio becomes 111 times smaller. It is configured.

Further, a cell starter motor 12 is integrally attached to the crankcase 3 adjacent to and oriented parallel to the crankshaft 2, and a starter motor gear 14 is formed integrally with the rotating shaft 13 of the cell starter motor 12. A pinion shaft 15 is located between the motor gear 14 and the starter driven gear 7 and is parallel to the bearing 16.
The driven gear 1γ, which is pivotally supported through the cell starter motor 14 and is integral with the union shaft 15, is screwed together with the starter motor gear 14, so that when the cell starter motor 12 rotates, the union shaft 15 is driven to rotate correspondingly. It has become.

Furthermore, a pinion boss 18 is located close to the starter driven gear 7 from the driven gear 17 and is fitted with a clockwise helical spline 19 to the pinion shaft 15, and a bearing 20 is located near the starter driven gear 7.
pinion boss 1.
A stopper 22 is interposed between the spline portion 21 of the pinion shaft 15 and the bearing 20, and a coil spring 24 is interposed between the bearing 20 and the pinion stopper 23 fitted to the left end of the pinion shaft 15. A friction spring 26 is fitted in the directional groove 25, a center shaft 27 protruding from the crankcase 3 is held between both legs of the friction spring 26, and a starter pinion gear 28 is mounted on the pinion boss 18 in the opposite direction to the helical spline fitting 19. When the rotating shaft 13 of the cell starter motor 12 rotates counterclockwise in FIG. 4 and the driven gear 1γ and the binion shaft 15 are rotated clockwise, the pinion boss 18 As a result, the pinion boss 18 overcomes the spring force of the coil spring 24 and moves toward the starter driven gear 7 (to the left), causing the starter pinion gear 28 to move toward the starter driven gear 7. 7 is screwed together.

Moreover, the stopper ring 30 on the left end of the pinion boss 18
A pinion gear return spring 31 is interposed between the starter pinion gear 28 and the starter pinion gear 28, and a tubular spring holder 32 is disposed outside the pinion gear return spring 31.
is loosely fitted.

Since the illustrated embodiment is configured as described above, when the internal combustion engine 1 and the cell starter motor 12 are stopped, the spring force of the coil spring 24 and the pinion gear return spring 31 causes the pinion boss 18 to
The starter pinion gear 28 is pushed to the right with respect to the binion shaft 15, as shown in FIG.
It's more out of place.

In this state, when the cell starter motor 12 is driven and the binion shaft 15 is rotated clockwise,
As shown in FIG. 2, the starter pinion gear 28 moves to the left as described above, the starter pinion gear 28 is screwed into the starter driven gear 7, and the starter driven gear 7 and the crankshaft 2 are driven to rotate counterclockwise. and the internal combustion mrIAi is cranked.

During cranking illustrated in FIG. 2, the internal combustion engine 1
While the piston (not shown) in the cylinder moves beyond the top dead center toward the bottom dead center, the crankshaft 2 and the starter driven gear 7 suddenly move counterclockwise temporarily due to the pressure of the intake air in the cylinder or the explosion pressure of the combustion gas. When accelerated, the starter pinion gear 28 is rotated clockwise faster than the pinion boss 18 and pinion shaft 15 between points A and 8 in FIG. 5, and as shown in FIG.
Due to the helical spline fitting 29 between the starter pinion gear 28 and the starter pinion gear 28, the starter pinion gear 28 moves to the left with respect to the pinion boss 18. Short time (5th
Until point 0 in the figure), the starter pinion gear 28 is rotated slower than the pinion boss 18 and the pinion shaft 15, and rotates counterclockwise relative to the pinion boss 18 and the pinion shaft 15. As a result, the starter pinion gear 28 moves to the right with respect to the pinion boss 18, and from point A to point C, the starter pinion gear 28 moves to the right with respect to the pinion boss 18.
can maintain the screwed state with the starter driven gear 7, so the DJ force of the starter motor 12 is transferred to the crankshaft 2.
The internal combustion engine 1 is reliably cranked.

After the internal combustion engine 1 starts, the cell starter motor 1
2, the pinion shaft 15 also stops, and the pinion boss 18 and starter pinion gear 28 continue to rotate clockwise as the starter driven gear 7 rotates. The starter pinion gear 28 is moved to the right by the helical spline fitting 19 together with the pinion gear 28, and the starter pinion gear 28 is disengaged from the starter driven gear 7, and thus the cell starter motor 12 is disconnected from the internal combustion engine 1.

In this way, simply by rotating or stopping the cell starter motor 12, it becomes possible to connect or disconnect the rotating shaft 13 of the cell starter motor 12 and the crankshaft 2 of the internal combustion engine 1, making the starting operation extremely simple and convenient. .

Furthermore, even if the crankshaft 2 and the starter driven gear 7 experience uneven rotation due to compression, expansion, explosion, etc. of the intake air in the cylinder of the internal combustion engine 1, the starter pinion gear 2
8 is always screwed into the starter driven gear 7, and the internal combustion engine I11 is reliably started.

Furthermore, since it is only necessary to fit the starter pinion gear 28 to the pinion boss 18 with a helical spline 29 and attach the stopper ring 30, pinion gear return spring 31, and spring holder 32 to a normal starting device, the structure is not as complicated as the left. , the improvement is simple and an inexpensive starting device can be obtained.

In the embodiment described above, the pinion boss 18 was made to stand still by causing friction between the friction spring 26 and the on-boss 18 at the beginning of rotation of the cell starter motor 12. However, by increasing the rotational moment of inertia of the pinion boss 18, the pinion Of course, the present invention can also be applied to an inertial diving starter in which the boss 18 is stationary.

In addition, the pinion shaft 15 and the pinion boss 18 and the pinion boss 18 and the starter pinion gear 28 are each fitted with a helical spline 1 and 19 and a helical spline 29, but even if they are screwed together with a screw with a large advance, good.

As described above, in the present invention, by rotating the cell starter motor, it is possible to automatically connect the cell starter motor and the internal combustion engine to start the internal combustion engine, and also to rotate the cell starter motor. When the starter motor is stopped, the connection between the cell starter motor and the internal combustion engine can be automatically severed, thereby protecting the cell starter motor. This makes the starting operation easier, the structure simpler, and cost reduction possible.

Furthermore, in the present invention, even if the crankshaft is temporarily accelerated and its rotational speed increases during starting by the cell starter motor, the increase in speed is absorbed and the connection between the cell starter Tanabata and the internal FFI engine is improved. The internal combustion engine can be started stably and reliably by holding the internal combustion engine.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view illustrating an embodiment of the starting device for an internal combustion engine according to the present invention, FIGS. 2 and 3 are sectional views illustrating the operating state of the same embodiment, and FIG. Early start, 3rd
The figure shows a state in which the crankshaft is temporarily accelerated, Figure 4 is a view from the rV-rV arrow in Figure 1, and Figure 5 illustrates the relationship between the crank phase and rotational speed of the internal combustion engine. It is an explanatory diagram. 1... Internal combustion am, 2... Crankshaft, 3... Crank case, 4... Bearing, 5... Belt transmission automatic transmission, 6... Fixed pulley, 7... Starter driven gear , 8... Movable pulley, 9... Belt, 1
0... Fixed face, 11... Weight, 12...
・Cell starter motor, 13...rotating shaft, 14...
Starter motor gear, 15...binion shaft, 1
6... Bearing, 17... Driven gear, 18.
...Pinion boss, 19...Helical spline fitting, 20...Bearing, 21...Spline part, 2
2...stopper, 23...binion stopper,
24...Coil spring, 25...Circumferential groove, 2
6...Friction spring, 27...Ratio axis, 2
8... Starter pinion gear, 29... Helical spline fitting, 30... Stopper ring, 31...
・Pinion gear return spring, 32...spring holder.

Claims (1)

[Claims] A pinion is screwed onto the pinion shaft, which is driven by the rotation of the cell starter motor, through a screw cut in such a direction that the rotation of the pinion shaft in the starting direction approaches the starter driven gear that is integrated with the crankshaft. A starting device for an internal combustion engine, comprising a boss, and a pinion gear that is screwed onto the pinion boss through a screw in the opposite direction to the screw between the pinion shaft and the pinion boss and screwed onto the starter driven gear.