JPH0724614Y2 - Internal combustion engine starter - Google Patents

Description

The present invention relates to a starting device for an internal combustion engine.

2. Description of the Related Art As a starting device for an internal combustion engine, there is known a starting device of a type that winds a mainspring in advance to store the mainspring, and temporarily releases the stored power to start the internal combustion engine. In this case, there are a manual energy storage system that manually stores energy in the mainspring and an automatic energy storage system that automatically uses the driving force when the internal combustion engine is in normal use. The former method has the drawback of requiring human power to wind the mainspring. The latter method has been considered to improve this, but the conventional automatic energy storage method uses an intermittent feeding and hoisting mechanism in the power transmission section between the internal combustion engine and the starter, and therefore the apparatus is It is complicated and heavy, and the power of the internal combustion engine is transmitted to the starter even during normal use, the engine loses a lot of power, and in addition, it is not compatible with the recoil type starter.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a starting device for an internal combustion engine, which is small in size, light in weight, and convenient in which the problems of the conventional techniques are solved.

According to the present invention, a starting device for an internal combustion engine mounts a mainspring between a mainspring bridge and a winding gear, and the mainspring bridge is connected to a crank of the internal combustion engine via a ratchet wheel and a starting pawl. A clutch drum connected to the shaft and rotatably and movably in the axial direction, a clutch drum fixed to the drive shaft is attached to a clutch boss portion rotatably supported by a crankshaft via a centrifugal clutch. It is connected so that it can be contacted and separated, and it is also connected to a winding gear through a one-way clutch, and is normally biased and held in a stationary position by a spring and connected to the drive shaft. A lever mechanism for moving the drive shaft in a direction to release the engagement with
It is characterized in that the lever mechanism is provided with a claw that engages with a projection formed on the mainspring bridge at its rest position.

Therefore, the mainspring is automatically wound up by the driving force of the internal combustion engine transmitted through the clutch, the drive shaft and the clutch, and the power is stored.When the winding is completed, the drive shaft is moved by the lever mechanism. Then, the clutch is released to prevent excessive entrainment, and when the engine is started, the mainspring bridge is rotated by the stored force of the mainspring, and thereby the crankshaft is rotated to start the internal combustion engine.

Embodiment Next, the present invention will be described based on an embodiment of the drawings.

The starting device 1 of this embodiment includes a crankshaft 3 of an internal combustion engine 2.
Is disposed close to one end of the. The starting device 1 has a detachable case 4 on one side of the internal combustion engine, and an inner wall 5 of the case 4 extends toward the crankshaft 3 coaxially with the crankshaft 3 of the internal combustion engine 2. Existing cylindrical boss 6
Is integrally formed, and a winding gear 7 and a drum-shaped mainspring receiver 8 are independently rotatably supported on the outer peripheral portion of the boss portion 6. The mainspring receiver 8 is the winding gear 7
The mainspring 10 spirally wound between the mainspring 10 and the boss portion 9 of the mainspring 10 is housed at its inner end.
The mainspring 10 is locked to the boss portion 9 and the outer end of the mainspring 10 is locked to the mainspring bridge 8. The mainspring bridge 8 is formed integrally with a ratchet wheel 11.

The crankshaft 3 of the internal combustion engine 2 has a flange member 12 fixed to the end thereof, and the flange member 12 has a starting pawl 13 pivotally attached to the outer periphery thereof. The starting pawl 13 is biased by a spring 14 and is engaged with the ratchet wheel 11 of the mainspring bridge 8. The mainspring bridge 8 and the ratchet wheel 11 of the mainspring bridge 8 and the ratchet wheel 11 are stored in the mainspring 10 as described later. The rotational force in one direction is transmitted to the crankshaft 3 via the flange member 12.

Further, the crankshaft 3 of the internal combustion engine 2 has a centrifugal clutch boss member 15 fixed to the end thereof. The centrifugal clutch boss member 15 is integrally formed with a pair of centrifugal clutches 16 as shown in FIG.
Is frictionally engaged with the inner peripheral surface of the centrifugal clutch drum 17 surrounding the outer peripheral portion by the action of the centrifugal force generated by the rotation of the crankshaft 3, so that the rotational force of the crankshaft 3 is transmitted to the centrifugal clutch drum 17. It has become. The centrifugal clutch drum 17 is independently rotatably supported by a stationary member 19 of the centrifugal clutch boss member 15 via a bearing 18 such as a rolling bearing. On the outer side of the centrifugal clutch drum 17, a cone clutch boss portion 20 having the shape of a truncated cone is integrally formed.

The boss portion 6 of the inner wall 5 of the case 4 of the starting device 1 has a drive shaft 21 penetratingly supported in an axial hole 59 at the center thereof, and the drive shaft 21 with respect to the boss portion 6. They are fitted so that they can rotate relative to each other and can move axially. The drive shaft 21 has a cone clutch drum 22 fixed to its inner end, and the cone clutch drum 22 is always frictionally engaged with the outer cone surface of the cone clutch boss portion 20. The cone clutch drum 22 is adapted to be released from frictional engagement with the cone clutch boss portion 20 when the drive shaft 21 is moved rightward as viewed in FIG. 1 as described later. .

A drive pinion 58 is provided on the outer end of the drive shaft 21 protruding from the side surface of the inner wall 5 of the case 4 opposite to the winding gear 7. The drive pinion 58 is rotatable on the inner wall 5. Is engaged with the first gear wheel 23 supported by the
Couples a first pinion gear 24 arranged coaxially.
The first small gear 24 likewise engages with a second large gear 25 rotatably supported on the inner wall 5, the second large gear 25 being a coaxially arranged second small gear. Tying 26. The case 4 has another shaft 27 attached to it, which supports a one-way clutch 28 which is engaged with the second pinion 26 by a third gear wheel. Supports 29. In this way, these gears 23, 24, 25, 26 and 29
Rotates the third large gear 29 at a reduced speed by the rotational force of the drive shaft 21 configured as a reduction gear train as shown in FIG. The other shaft 27 is the one-way clutch.
It also supports a gear 30 which is connected via a 28 to the third gear wheel 29, which gear 30 is engaged with the winding gear 7. The one-way clutch 28 operates so as to transmit the rotation of the mainspring 10 in the power storage direction from the drive shaft 21 to the winding gear 7, but prevent the rotation in the opposite direction.

The gear 30 is also engaged with a hand-wound gear 31. The hand-wound gear
Reference numeral 31 is supported by a fixed shaft 32 attached to the case 4 via a one-way clutch 33, and the fixed shaft 32 is coaxially fitted to a shaft 35 of a manual handle 34. 32
And 35 are connected to the hand-wound gear 31 via the one-way clutch 33 extending over both shafts. Therefore, the one-way clutch 33 transmits the rotation to the winding gear 7 via the both gears 31 and 30 when the manual handle 34 is rotated in the power storage direction of the mainspring 10. , It acts to prevent rotation in the opposite direction.

A plurality of reverse rotation preventing projections 36 are formed on the outer peripheral surface of the mainspring receiver 8. As shown in FIG. 3, the case 4 supports a rotatable shaft 37 therein, and one end of a lever 38 is fixed to the shaft 37. Further, one end of an arm member 39 is fixed to the shaft 37, and the other end of the arm member 39 is engaged with a compression spring 40 supported by the case 4, thereby causing the lever 38 to move. As seen, the pressure is constantly biased counterclockwise about the shaft 37. The lever 38 has a starting operation lever 42 pivotally attached to a pivot 41 at its free other end.
The start-up operation lever 42 has a locking claw 43 formed at the tip thereof, and the locking claw 43 is provided with a reverse rotation preventing projection 36 of the mainspring bridge 8.
Are arranged so that they can be engaged with. Due to the spring 44 provided around the pivot 41, the starting operation lever 42 is normally in the rest position shown by the solid line in FIG. 3, and in this position, the locking claw 43 of the mainspring receiver 8 is held. The mainspring bridge 8 is retained by the reverse rotation preventing projection 36 so that the mainspring bridge 8 cannot be rotated in the reverse direction, and the mainspring 10 is held in a stored state. Further, the lever 38 has a lateral arm 45, and the tip of the lateral arm 45 is in contact with one end of the clutch lever 46. An intermediate portion of the clutch lever 46 is attached to a pivot shaft 47 provided in the case 4, and the other end of the clutch lever 46 is in contact with an end portion of the drive shaft 21 via a ball 48. The clutch lever 46 is further provided integrally with a pressing portion 49, and the tip of the pressing portion 49 is engaged with a flange portion 50 provided at the end portion of the shaft 21. The clutch lever 46 is biased clockwise by a spring 51 provided around the pivot shaft 47 as seen in FIG. 1, whereby the clutch lever 46 and the pressing member 49 have the drive shaft between them. The end of 21 is clamped, and the drive shaft 21 is constantly moved to the crankshaft 3 side.
Is pressing.

Note that, for convenience of explanation, the member related to the clutch lever 46 is shown in FIGS.

The mainspring receiver 8 has a pin 52 planted on its side surface,
And a piezoelectric hammer 53 that engages with this pin 52 at one end
Are pivotally attached to a pivot 54 provided on the case 4.
The other end of the piezoelectric hammer 53 is in contact with the operating member 56 of the piezoelectric element 55 attached to the case 4. The piezoelectric hammer 53 is biased clockwise around the pivot 54 by a spring 57 provided around the pivot 54 as seen in FIG.

Since the internal combustion engine starting device according to the present invention is configured as described above, when the internal combustion engine 2 is operating, the driving force from the crankshaft 3 thereof is generated by the centrifugal clutch, the cone clutch,
By rotating the winding gear 7 of the starting device 1 via the drive shaft 21, the spring 10 is automatically stored in the mainspring 10. spring
When the amount of accumulated power of 10 is saturated, the unwinding force of the mainspring 10 overcomes the biased pressure of the compression spring 40, and the mainspring bridge 8 pushes the locking pawl 43 back by rotating slightly clockwise as seen in FIG.
The lateral arm 45 of the lever 38 pushes down one end of the clutch lever 46 and rotates the clutch lever 46 counterclockwise as viewed in FIG. 1, so that the drive shaft 21 is pulled out to the right and the cone clutch drum 22 is rotated to the cone. The mainspring 10 is interrupted when it is separated from the clutch boss portion 20. Internal combustion engine 2
When the mainspring 10 stores energy when the mainspring 10 is stopped, the manual handle 34 is rotated to rotate the winding gear 7, and the mainspring 10 is rotated.
Stores the spring force manually. In this way, the starting device 1
Can prestore the spring force required for the next start of the internal combustion engine 2, either automatically or manually.

When the internal combustion engine 2 is started, the start operation lever 42 is pivoted further clockwise from the winding completion position shown by the chain line in FIG. Therefore, the locking claw 43 at one end of the starting operation lever 42 is disengaged from the reverse rotation preventing projection 36 of the mainspring bridge 8, so that the mainspring bridge 8 is rapidly rotated by the spring force of the mainspring 10.
This rotational force is transmitted to the crankshaft 3 via the ratchet wheel 11 and the starting pawl 13 to rotate the crankshaft 3. At the same time, the pin 52 of the mainspring bridge 8 pivots the piezoelectric hammer 53 counterclockwise as viewed in FIG. 2 against the action of the spring 57, the mainspring bridge 8 rotates further, and the pin 52 is moved toward the piezoelectric hammer 53. When disengaged, the piezoelectric hammer 53 is rapidly pivoted clockwise by the action of the spring 57 to actuate the actuating member 56 of the piezoelectric element 55.
Therefore, the piezoelectric element 55 generates a high voltage, and this voltage is supplied to an ignition circuit (not shown) of the internal combustion engine 2 to cause a spark in the spark plug of the internal combustion engine 2 to start the internal combustion engine 2. After the engine is started, the starting operation lever is returned to the rest position by the action of the spring 40, the locking claw 43 is engaged with the reverse rotation preventing projection 36 of the mainspring bridge 8, and the drive shaft 21 is left in FIG. Moving in the direction to frictionally engage the cone clutch drum 22 with the cone clutch boss portion 20. When the crankshaft 3 rotates at a speed higher than a predetermined number of revolutions, the centrifugal clutches 15, 16, 17 are connected, and the rotational force is transmitted to the drive shaft 21 to rotate the drive shaft 21 again. It automatically stores the spring force required to start the engine.

The case 5 of the starting device according to the present invention may be removed from the internal combustion engine 2 and a normal recoil type starting device may be attached as it is.

Effect of the Invention With the configuration of the present invention described above, the present invention does not require a complicated intermittent feeding and winding mechanism for the automatic winding mechanism of the mainspring by the driving force of the crankshaft, so that the device is compact and lightweight. In addition, the internal combustion engine and the starter can be separated from each other in driving in normal use to prevent wear of the device and loss of engine power. Instead of the recoil starter conventionally used by being connected to the crankshaft. There is an effect that it can be easily incorporated.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a preferred embodiment of a starting device for an internal combustion engine according to the present invention (partially cut away),
The drawing is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. 1 ... Starter, 2 ... Internal combustion engine, 3 ... Crank shaft,
4 ... Wound gear, 8 ... Mainspring, 10 ... Mainspring,
11 …… Ratchet car, 13 …… Starting claw, 20 …… Cone clutch boss, 22 …… Cone clutch drum, 28,33 ……
One-way clutch, 34 ... Manual handle, 36 ... Reverse rotation prevention protrusion, 38 ... Lever, 39 ... Arm member, 40 ... Compression spring,
42 …… Starting lever, 43 …… Locking claw, 45 …… Side arm, 46
…… Clutch lever, 53 …… Piezoelectric hammer, 55 …… Piezoelectric element.

Claims (1)

[Scope of utility model registration request] 1. A mainspring (10) is mounted between a mainspring bridge (8) and a winding gear (7), and the mainspring bridge is connected to an internal combustion engine (2) via a ratchet wheel (11) and a starting pawl (13). Drive shaft (21) is provided rotatably and axially movable, and a clutch drum (22) fixed to the drive shaft is attached to the crank shaft by a centrifugal clutch (15, 16, 17) is connected to the clutch boss (20) rotatably supported by a shaft so that the clutch boss (20) can be contacted with and separated from the clutch boss (20), and the one-way clutch (28) is connected to the winding gear. A lever mechanism that is biased by a spring (40) and is connected to the drive shaft to move the drive shaft in a direction to release the engagement between the clutch drum and the clutch boss when the mainspring is completely wound. 38, 39, 42, 45, 46) and set the lever mechanism in its rest position. The mainspring receiving engages the projection (36) formed on the pawl (43) for an internal combustion engine starting device comprising provided.