JP2002235640A - Engine starter - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an engine starter that combines both a motor start (cell motor) and a recoil starter start, which can absorb shock at the time of both start and improve startability. Offer. SOLUTION: In a starting apparatus for a small engine in which a cell starter and a recoil starter are combined, a recoil spring, a reel, and a starter motor are connected via a reduction gear to a drive shaft rotatably supported by a starter case. A final gear is arranged in series, and a power storage spring that transmits the rotational force thereof to the drive shaft with an elastic action when the starter motor is started and the recoil is started is housed in the final gear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine starter which combines both a motor start (cell motor) and a recoil starter used as a starter for a small engine.

[0002]

2. Description of the Related Art As a conventional starting device of this type, there are a starting device described in Japanese Patent No. 2521096 and a starting device described in Japanese Utility Model Publication No. 6-623. In the former, a drive gear having a cam engaged with a ratchet of a pulley fixed to a crankshaft of an engine is loosely inserted and fixed to a spindle of a starter case so as to engage with a ratchet provided on a reel of a recoil starter. The drive gear is connected to a starter motor provided along with the recoil starter via a reduction gear with a one-way clutch. And the drive gear are meshed with each other so that only rotation in one direction is transmitted to the crankshaft, so that cell start and recoil starter start can be used separately. Therefore, in the case of this starting device, even when it is difficult to start the cell because the battery is exhausted after being left for a certain period of time, the starting can be performed by the recoil starter.

[0003] However, in the above-mentioned starting device, the engine is started by the rotor gear decelerated from the starter motor via the one-way clutch, and at the same time, the recoil starter is also started by the rotor gear. There is no means for absorbing the shock when engaging with the engine side, and there is a problem that the clutch unit, the final gear, the motor, and the like are damaged.

[0004] On the other hand, the latter is designed to solve the above-mentioned problem, and is configured such that the engine is started by the rotor gear reduced from the self-motor through the one-way clutch, and the recoil starter is also started via the rotor gear. In the starting device described above, the input portion and the output portion of the rotor gear have separate cam portions, a plurality of projections are provided on each of the engagement portions, and a damper for absorbing an impact force is disposed between the two projections. It is a structure that was made. However, in the latter case, the effect of absorbing the shock by the damper is obtained, but due to the small amplitude of the damper, it is not possible to follow a severe engine speed fluctuation, and its effectiveness cannot be said to be sufficient. there were. In addition, in order to improve the startability, the only way was to increase the output of the motor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and an engine starting apparatus which combines both motor starting (cell motor) and recoil starter starting. It is another object of the present invention to provide an engine starting device capable of absorbing an impact at the time of both starting operations and improving startability.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the action of a power storage spring disposed on a drive shaft can absorb a large impact due to fluctuations in engine rotation during both starting of a motor and starting of a recoil starter. By accumulating the rotational torque of the motor in the mainspring and increasing the number of revolutions of the crankshaft when released, it is possible to improve the startability without increasing the output of the motor,
Further, a reverse load of the engine can be absorbed by the action of the energy storage spring. The first invention is directed to a pair of starter cases having a bearing portion provided on the axis of a crankshaft so as to face each other, A one-way clutch mechanism composed of a drive shaft rotatably supported at both ends by a portion, a cam portion provided at one end thereof, and a ratchet mechanism provided between the drive shaft and the engine; A reel rotatably mounted on the drive shaft, a rope wound on the reel, and a biasing direction in which both ends of the reel are hung on the starter case and the reel and the rope is wound. Having a ratchet type one-way clutch mechanism formed between the recoil spring and the reel engaged with the reduction gear having the one-way clutch mechanism. An inner gear, a power storage spring housed in the final gear, suspended at both ends of the final gear and the drive shaft, and transmitting the rotational force to the drive shaft with an elastic action when the starter motor is started and the recoil is started. According to a second aspect of the present invention, there is provided a pair of starter cases having a bearing portion provided on the axis of the crankshaft so as to face each other, and a drive having both ends rotatably supported by the bearing portion. A one-etch clutch mechanism constituted by a shaft, a cam portion provided at one end thereof, and a ratchet mechanism provided between the shaft and the engine side, and a rotation with respect to the drive shaft between the bearing portions on both sides; A freely mounted reel, a rope wound around the reel, and a rope wound around both ends of the starter case and the reel. Has a recoil spring that is biased in a direction, the ratchet one-way clutch mechanism configured between said reel, a reduction gear meshing with ratchet one-way clutch mechanism that,
A mainspring storage case attached to the drive shaft, and a power storage spring suspended at both ends of the case and the drive shaft and transmitting its rotational force to the drive shaft with an elastic action when the starter motor starts and the recoil starts. It is characterized by comprising.

[0007]

FIG. 1 is a longitudinal sectional side view showing an embodiment of an engine starting device according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1 (a ratchet mechanism on the reel side), and FIG. 1
4 is a cross-sectional view (ratchet mechanism on the crankshaft side) along the line CC in FIG. 1; FIG. 5 is a vertical cross-sectional side view showing another embodiment of the engine starting device according to the present invention; 6 is a cross-sectional view on the line AA in FIG. 5 (ratchet mechanism on the reel side), FIG. 7 is a cross-sectional view on the line B-B in FIG. 5, and FIG. 8 is a cross-sectional view on the line C-C in FIG. 1, 2 and 3 are starter cases, 3 is a drive shaft, 4 is a tip cam, 5, 14, 15, and 16 are ratchets, 6 is a pulley, 7 is a crankshaft, 8 is a reel, 9 is a rope, and 10 is a recoil. Mainspring, 11,
21 is a final gear, 12 is a mainspring storage case, 1
Reference numeral 3 denotes a storage spring, 17 denotes a reduction gear with a one-way clutch, 18, 19, and 20 denote reduction gears, and 24 denotes a starter motor.

In FIG. 1, starter cases 1 and 2 are integrated on the axis of crankshaft 7 with fastening bolts, and bearings 1-1 and 2- provided at the center of the pair of starter cases 1 and 2 are shown. 1, a drive shaft 3 is rotatably supported at both ends thereof. One end of the drive shaft 3 on the crankshaft 7 side is provided with the crankshaft 7.
The ratchet 5 attached to the side surface of the pulley 6 attached to the front end is opposed to the tip cam portion 4, and the return spring 5
-1 (FIG. 4) to form a ratchet type one-way clutch in which the pulley 6 rotates only in one direction of rotation of the drive shaft 3 and is constantly urged to lock with the tip cam portion 4. The mechanism is to start the engine via the.

A concave portion 8 for accommodating a rope 9 is provided on an outer peripheral portion of the reel 8 rotatably mounted on the drive shaft 3.
a, the rope 9 is pulled out between the reel 8 and the starter case 1, and after releasing the hand from the rope, a recoil spring (for rewinding) is housed so that the rope 9 is again stored in the recess 8 a of the reel. A mainspring 10 is provided. A final gear 11 is rotatably loosely inserted approximately in the middle of the drive shaft 3, and a power storage spring 13 having an elastic action is provided inside the final gear 11. The outer end of the energy storage spring 13 is fixed to the final gear 11, and the inner end is fixed to the drive shaft 3 (FIG. 3). That is, when the final gear 11 rotates clockwise (in the direction of arrow B), the power storing spring 13 is stored, and the drive shaft 3 is rotated clockwise by the inner end hook 13a. A ratchet 14 is provided between the final gear 11 and the reel 8 as shown in FIG.
4-1 is pivotally attached to the reel 8, while the other end of the ratchet 14 has a stopper portion 14-2, which is normally urged inward by a return spring 14-3, and
Between the final gear 11 and the final gear 11 is a ratchet type one-way clutch. That is, the ratchet type one-way clutch has a mechanism for rotating the final gear 11 clockwise by rotating the reel 8 clockwise (in the direction of arrow A) at the start of recoil.

On the other hand, a starter motor (cell motor) 24
Is mounted on the other starter case 2 in parallel with the recoil starter.
1, the reduction gear 18, the intermediate shaft 24-2
The final gear 11 is rotated via a reduction gear 19 attached to the motor and a reduction gear 17 with a one-way clutch.

The operation will be described below. First, when the starter motor 24 is started, the final gear 11 rotates via the reduction gears 18 and 19 and the reduction gear 17 with a one-way clutch, so that the drive shaft 3 that rotates in the same direction with a slight delay from the final gear 11 is rotated. The tip cam portion 4 engages with the ratchet 5 of the pulley 6 mounted on the crankshaft 7 of the engine to start the engine. Final gear 1 by starter motor 24
When 1 rotates clockwise as shown by the arrow B in FIG. 3, the power storage spring 13 provided between the drive shaft 3 and the final gear 11 is stored, and the drive shaft 3 is rotated clockwise by the inner end hook 13a. Therefore, the impact (load) generated by the rotation fluctuation of the engine is absorbed by the power storage spring 13, and the load on each part is reduced, so that the damage of the parts is prevented. Further, since the rotational torque of the starter motor 24 is released after the power storage spring 13 is stored, the rotation torque of the engine crankshaft 7 is reduced.
And the startability is remarkably improved.

Next, when the recoil starter is started, the reel 8 is rotated by pulling the rope 9, and the drive shaft 3 is driven through the ratchet 14 attached to the reel and the power storage spring 13 built in the final gear 1.
Rotates, the engine is started via the ratchet 5 attached to the pulley 6 attached to the crankshaft 7. Even when the recoil is started, the final gear 11 rotates clockwise as shown by the arrow B as shown in FIG. 3, so that the energy storage spring 13 provided between the drive shaft 3 and the final gear 11 is accumulated, and The drive shaft 3 is rotated clockwise by the hook 13a. Therefore, even when the recoil is started, the impact (load) generated by the fluctuation of the rotation of the engine is not affected by the energy stored in the power storage spring 1.
3, the load on each part is reduced, and as a result, damage to the parts is prevented.

The engine starter shown in FIGS. 5 to 8 has a structure in which the power storage mainspring storage section and the final gear are separated, and a ratchet type one-way clutch is provided between the final gear and the power storage mainspring storage case. The starter cases 1 and 2 are integrated on the axis of the crankshaft 7 with fastening bolts as in the above, and a bearing 1 provided at the center of the pair of starter cases 1 and 2 is provided. The drive shaft 3 is rotatably supported at both ends of the drive shaft 3, and one end of the drive shaft 3 on the side of the crank shaft 7 is provided with the crank shaft 7.
The ratchet 5 attached to the side surface of the pulley 6 attached to the front end is opposed to the tip cam portion 4, and the return spring 5
-1 (FIG. 4) to form a ratchet type one-way clutch in which the pulley 6 rotates only in one direction of rotation of the drive shaft 3 and is constantly urged to lock with the tip cam portion 4. The mechanism is to start the engine via the.

A concave portion 8 for accommodating a rope 9 is provided on an outer peripheral portion of the reel 8 rotatably mounted on the drive shaft 3.
a, the rope 9 is pulled out between the reel 8 and the starter case 1, and after releasing the hand from the rope, a recoil spring (for rewinding) is housed so that the rope 9 is again stored in the recess 8 a of the reel. A mainspring 10 is provided. A spring housing case 12 is loosely inserted into the drive shaft 3 at a substantially intermediate portion of the drive shaft 3.
A power storage spring 13 having an elastic action is provided on the inside. The outer end of the power storing spring 13 is fixed to the mainspring storage case 12, and the inner end is fixed to the drive shaft 3 (FIG. 7). This spring storage case 12
A ratchet 15 is provided between the reel 8 and the reel 8, as shown in FIG. 6, and a shaft portion 15-1 is pivotally connected to the reel 8, while the other end of the ratchet 15 has a stopper portion 15-2. Is biased inward by a return spring 15-3, and the space between the reel 8 and the mainspring storage case 12 is a ratchet type one-way clutch. That is, the ratchet type one-way clutch has a mechanism for rotating the mainspring storage case 12 clockwise by rotating the reel 8 clockwise (in the direction of the arrow A in FIG. 6) at the start of the recoil operation. On the opposite side of the mainspring case 12, a final gear 21 is loosely inserted into the drive shaft 3 adjacent thereto, and a ratchet 16 is provided between the mainspring case 12 and the final gear 21 as shown in FIG. The shaft 16-1 is pivotally connected to the final gear 21, while the other end of the ratchet 16 is connected to the stopper 1
6-2, and is normally urged inward by a return spring 16-3 to form a ratchet type one-way clutch between the final gear 21 and the mainspring storage case 12. That is, when the final gear 21 rotates clockwise (in the direction of arrow C), the power storage spring 13 is stored, and the drive shaft 3 is rotated clockwise by the inner end hook 13a (FIG. 7).

On the other hand, a starter motor (cell motor) 24
Is mounted on the other starter case 2 in parallel with the recoil starter.
1, the reduction gear 18, the intermediate shaft 24-2
The mechanism rotates the final gear 21 via a reduction gear 1920 attached to the motor.

The operation will be described below. First, in the case of starting the starter motor 24, the reduction gears 18, 19, 2
The rotation of the final gear 21 through 0
The power storage spring 13 is stored through a ratchet type one-way clutch provided between the final gear 21 and the mainspring storage case 12, and the drive shaft 3 rotates rightward at the inner end hook 13a (FIG. 7), and the drive shaft 3 The leading end cam portion 4 engages with the ratchet 5 of the pulley 6 mounted on the crankshaft 7 of the engine to start the engine. Therefore, the impact (load) generated by the rotation fluctuation of the engine is absorbed by the power storage spring 13, and the load on each part is reduced, so that the damage of the parts is prevented. Further, since the rotational torque of the starter motor 24 is released after the stored power spring 13 is stored, the rotational speed of the crankshaft 7 of the engine is increased and the startability is remarkably improved.

Next, in the case of starting the recoil starter, the rope 8 is rotated by pulling the rope 9, and the ratchet 15 and the mainspring case 1 attached to the reel are rotated.
Since the drive shaft 3 rotates through the energy storage spring 13 built in the engine 2, the engine is started via the ratchet 5 attached to the pulley 6 mounted on the crankshaft 7. Even at the time of this recoil start, FIG.
As shown in FIG. 5, the mainspring storage case 12 rotates rightward as indicated by the arrow B, so that the power storage spring 13 provided between the drive shaft 3 and the mainspring storage case 12 is stored, and the drive shaft 3 is held by the inner end hook 13a. Rotate right. Therefore, even at the time of starting the recoil, the impact (load) generated by the rotation fluctuation of the engine is absorbed by the energy storage spring 13, and the load on each part is reduced, so that damage to the parts is prevented.

[0018]

As described above, according to the starting device of the present invention, the action of the energy storage spring disposed on the drive shaft causes a large impact due to engine rotation fluctuations in both starting of the motor and starting of the recoil starter. Can prevent the parts from being damaged.Also, by accumulating the rotating torque of the motor in the spring and increasing the number of rotations of the crankshaft when the motor is released, the startability can be improved without increasing the output of the motor. In addition, there is an excellent effect that the reverse load of the engine can be absorbed by the action of the power storage spring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of an engine starting device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1;

FIG. 5 is a longitudinal sectional side view showing another embodiment of the engine starting device according to the present invention.

FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5;

FIG. 7 is a cross-sectional view taken along the line BB of FIG. 5;

FIG. 8 is a cross-sectional view taken along the line CC in FIG. 5;

[Explanation of symbols]

 1, 2 Starter case 3 Drive shaft 4 Tip cam 5, 14, 15, 16 Ratchet 6 Pulley 7 Crankshaft 8 Reel 9 Rope 10 Recoil spring 11, 21 Final gear 12 Spring storage case 13 Energy storage spring, 17 With one-way clutch Reduction gear 18, 19, 20 Reduction gear 24 Starter motor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02N 15/02 F02N 15/02 D

Claims (2)

[Claims] 1. A pair of starter cases each having a bearing portion provided on the axis of a crankshaft so as to face each other, a drive shaft rotatably supported at both ends by the bearing portion, and a cam provided at one end thereof. Part, a one-wet clutch mechanism configured by a ratchet mechanism provided between the engine side, and a reel rotatably mounted on a drive shaft between the bearings on both sides,
A rope wound around the reel, a recoil spring suspended at both ends of the starter case and the reel, and urged in a direction to wind the rope, and a reduction gear with a one-way clutch mechanism meshed with the reel. A final gear having a configured ratchet type one-way clutch mechanism, and both ends are housed in the final gear and suspended on both ends of the final gear and the drive shaft, and when the starter motor is started and the recoil is started, the rotational force is elastically applied. A starting device for an engine, comprising: a power storage spring that transmits the power to a drive shaft. 2. A pair of starter cases having bearings provided on the axis of a crankshaft so as to face each other, a drive shaft having both ends rotatably supported by said bearings, and a cam provided at one end thereof. A one-way clutch mechanism constituted by a ratchet mechanism provided between the section and the engine side, a reel rotatably mounted on a drive shaft between the bearing sections on both sides, and a reel wound around the reel. The wound rope, a recoil spring suspended at both ends of the starter case and the reel, and urged in the direction of winding the rope, and a spring storage case attached to the reel and a drive shaft. A ratchet-type one-way clutch constituted between a ratchet-type one-way clutch mechanism and a reduction gear meshing with the mainspring storage case. A final gear mounted on the drive shaft, and housed in the mainspring storage case, both ends of which are suspended by the case and the drive shaft. And a power storage spring that transmits the power to the drive shaft.