JPH0724615Y2 - Internal combustion engine starter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine starter, and more particularly to an internal combustion engine starter suitable for use in a backpack type or portable power machine.

2. Description of the Related Art Conventionally, a recoil type starting device has been used as a simple starting device for an internal combustion engine, and this recoil type starting device pulls the rope wound around a drum by hand by the spring force of a mainspring. The drum is rotated, and this rotational force is transmitted to the crankshaft of the internal combustion engine through the ratchet mechanism to rotate the crankshaft and start the internal combustion engine. However, such a starting device requires a considerable amount of force for the starting operation, and is therefore unsuitable for the elderly or women to use in their backpack-type or portable machines. In this case, there is a drawback that the engine must be started with the machine lowered from the back.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an internal combustion engine starter that eliminates the drawbacks of the prior art and is easy to manufacture and convenient to use.

Means for Solving the Problems An internal combustion engine starting device according to the present invention includes a support shaft attached to a case, a winding gear member rotatably supported by the support shaft, and the winding support member supported by the support shaft. Claw wheel that can rotate independently of the gear wheel member, a winding pin connected between the winding gear member and the claw wheel, a driving gear member that engages with the winding gear member, and the driving gear wheel A flexible drive shaft that extends from the member to the outside of the case and is operated via the drive gear member to rotate the winding gear member in the power storage direction of the mainspring; A locking member that is engaged with an engaging portion and is pressed by a spring so as to prevent rotation of the ratchet wheel, and the locking member that extends from the case to the outside and that interlocks with the throttle operation to lock the ratchet wheel. Designed to release from the engaging part A flexible control cable that is moved, and the ratchet wheel is connected to the crankshaft of the internal combustion engine by a centrifugal ratchet that allows rotation in only one direction.

Therefore, by rotating the flexible drive shaft from any remote position, spring force is stored in the mainspring prior to engine start, and the flexible control cord is started from any remote position at engine start. The engine can be started by operating to release the locking member from the engaging portion of the ratchet wheel, releasing the accumulated power of the mainspring and rotating the crankshaft of the engine.

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

The illustrated embodiment is an example in which the present invention is applied to a starting device for starting an internal combustion engine of a backpack type working machine such as a chemical spraying machine,
As shown in FIG. 1, the starter 1 has its case 2 attached to an engine case 3 and is arranged close to one end of a crankshaft 4 of an internal combustion engine. The case 2 has a support shaft 5 mounted coaxially with the crank shaft 4 therein.
The support shaft 5 rotatably supports the winding bevel gear member 6 and the ratchet wheel 7 independently of each other. The winding bevel gear member 6 is integrally formed with a boss portion 8 extending toward the ratchet wheel 7, and the ratchet wheel 7 is integrally formed with a cylindrical portion 9 extending toward the winding bevel gear member 6. Is formed into
A spirally wound mainspring 10 is arranged in an annular space formed between a boss portion 8 of the winding bevel gear member 6 and a cylindrical portion of the ratchet wheel 7. The mainspring 10
Has its inner end connected to the outer peripheral portion of the boss portion 8 of the winding bevel gear member 6 and the outer end of the mainspring 10 connected to the inner peripheral portion of the cylindrical portion 9 of the ratchet wheel 7.

The crankshaft 4 of the internal combustion engine has a pawl 11 pivotally mounted at an eccentric position, and the pawl 11 is a ratchet tooth formed on the pawl wheel 11.
When the ratchet wheel 7 is biased and engaged with the spring 12 by the spring 23 and the ratchet wheel 7 rotates relative to the crankshaft 4 in the same direction as the rotational operation direction, a rotational force is applied from the ratchet wheel 7 to the crankshaft 4. 4 is transmitted, but when rotating in the opposite direction,
The pawl 11 is arranged so as to release the engagement with the ratchet tooth 12 and not transmit the rotational force in the opposite direction, and the pawl 11 is arranged when the rotational speed of the crankshaft 4 is increased by starting the engine. Is configured to separate from the ratchet wheel 7 by the action of centrifugal force. The mainspring 10 is wound so as to store its spring force in the rotation direction of the crankshaft 4.

A large number of engaging groove portions 13 arranged in the circumferential direction are formed on the outer peripheral surface of the cylindrical portion 9 of the ratchet wheel 7, and a locking member 14 capable of engaging with the engaging groove portions 13 is provided on the case 2 side. It is provided in.
As shown clearly in FIG. 2, the locking member 14 is arranged in a recess 15 formed in the case 2 so as to be capable of reciprocating toward the ratchet wheel 7. Further, the locking member 14 is pressed toward the ratchet wheel 7 by the compression coil spring 16 arranged in the recess 15 of the case 2,
As a result, the pair of locking end portions 17 formed at the tip end portion of the locking member 14 are engaged with the engaging groove portions 13 on the outer peripheral surface of the cylindrical portion 9 of the ratchet wheel 7 to engage the ratchet wheel 7. It is configured to prevent rotation. Furthermore, the locking member 14 connects a flexible control cable 18 such as a Bowden cable extending from the case 2 to the outside, and the outer end of the flexibility control cable 18 is convenient for an operator to operate. It is connected to a starting lever (not shown) provided on a part of the work machine.

Further, the case 2 is rotatably attached with another drive bevel gear member 19 that engages with the gear portion of the winding bevel gear member 6, and the drive bevel gear member 19 is a flexible drive shaft.
20 are connected. The flexible drive shaft 20 is the case 2
To the outside, the external end of which is connected to a suitable rotating member (not shown) such as a crank handle provided on the part of the work machine that is convenient for the operator to operate. Further, the case 2 is provided with a reverse rotation preventing claw 21 pivotally attached to its inner wall surface, and the reverse rotation preventing claw 21 engages with a locking projection 22 formed on an end surface of the winding bevel gear member 6. The rotation of the spiral bevel gear member 6 in the direction in which the mainspring 10 is stored is allowed, but is biased by a spring (not shown) so as to prevent rotation in the opposite direction.

Before the engine is started by the starting device 1 according to the present invention configured as described above, the worker rotates the crank handle of the flexible drive shaft 20 and the like, and the bevel gear member 19 for winding through the bevel gear member 19 for driving. Rotate 6. At this time, the locking member 14
Since the engaging end portion 17 of the spring engages with the engaging groove portion 13 of the ratchet wheel 7 to prevent the ratchet wheel 7 from rotating, the mainspring 10 gradually stores the spring force thereof. When the rotation of the flexible drive shaft 20 is stopped when the mainspring 10 is properly accumulated, the winding bevel gear member 6
Is prevented from rotating in the opposite direction by the engagement between the locking projection 22 and the reverse rotation preventing claw 21 of the case 2, and therefore the mainspring
10 is kept in a stored state.

When starting the engine, the operator operates the above-mentioned starting lever to pull the flexible control cord 18. As a result, the locking member 14 moves against the action of the compression coil spring 16 and its locking end portion is moved.
17 is disengaged from the engaging groove portion 13 of the bevel gear member 6 for winding. Therefore, the ratchet wheel 7 rapidly rotates due to the spring force accumulated in the mainspring 10, and the torque of the ratchet wheel 7 is transmitted to the crankshaft 4 via the pawl 11 to rotate the crankshaft 4 and the internal combustion engine. The engine can be started. When the engine starts and reaches the idling speed, the pawl 11 is separated from the ratchet teeth 12 of the ratchet wheel 7 by the action of centrifugal force, and the drive connection between the starting device 1 and the crankshaft 4 is cut off.

As another embodiment (not shown), the flexible control cord 18 of the starter 1 is connected to a throttle lever for operating the throttle valve of the engine, and the throttle lever is operated to open the throttle valve at the same time when the engine is started. The locking member 14 of the starting device 1 may be released from the ratchet wheel 7 and the crankshaft 4 may be rotated by the stored force of the mainspring 10 to start the internal combustion engine.

Effect of the Invention With the configuration of the present invention described above, the present invention has the gear member, the mainspring and the ratchet wheel arranged around the support shaft of the case, so that the structure is simple and the manufacturing and maintenance inspection is easy. Further, since the power storage of the mainspring and the engine start can be performed from a position away from the starter, and the throttle layer can be operated at the same time, the starter can be operated with the machine carried on a backpack-type working machine in particular. With it, you can open the throttle valve and adjust the engine output, and without changing the parts on the crankshaft side,
The present invention has an effect that it can be easily used in place of the conventional recoil type starting device.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of an internal combustion engine starting device according to the present invention, and FIG. 2 is a cutaway view of a portion of the embodiment of FIG. 2 ... Case, 4 ... Crank shaft, 5 ... Support shaft, 6, 19
…… Gear member, 7 …… Claw wheel, 10 …… Spring, 13 …… Engagement part, 14 …… Locking member, 16 …… Spring, 18 …… Flexible control cable, 20 …… Flexibility Drive shaft.

Claims (1)

[Scope of utility model registration request] 1. A support shaft (5) attached to a case (2),
A winding gear member (6) rotatably supported by the support shaft, a ratchet wheel (7) supported by the support shaft and rotatable independently of the winding gear member, the winding gear member and the A mainspring (10) connected between the ratchet wheels,
A drive gear member (1 that engages with the winding gear member
9), and a flexible drive shaft that extends from the drive gear member to the outside of the case and is operated via the drive gear member to rotate the winding gear member in the power storage direction of the mainspring. 20) and the engaging portion (1
3) to engage the spring (1) to prevent rotation of the ratchet wheel.
The locking member (14) pressed by 6) and the flexibility that extends outward from the case and operates so that the locking member is interlocked with the throttle operation and released from the engaging portion of the ratchet wheel. An internal combustion engine starter comprising a control ratchet (18) and a centrifugal ratchet connection (11, 12) that allows the ratchet wheel to rotate in only one direction with respect to a crankshaft (4) of the internal combustion engine.