JPH063188Y2 - Internal combustion engine starter - Google Patents

Description

TECHNICAL FIELD The present invention relates to an internal combustion engine starter.

2. Description of the Related Art A recoil type starting device is known as a device for manually starting an internal combustion engine.This starting device pulls a rope wound around a recoil drum with a mainspring with a strong force to rotate a crankshaft, The internal combustion engine is designed to be started, which makes it difficult to start the engine, especially by a weak woman. Therefore, before starting the engine, the mainspring is wound up with a comparatively weak force to store the power in advance, and the stored power of the mainspring is rapidly released to rotate the crankshaft to start the internal combustion engine. Is proposed. However, the conventional starting device of this type is relatively large in shape and heavy in weight, so that it is not suitable as an internal combustion engine starting device for a portable or backpack type working machine, and the structure on the crankshaft side is changed. Otherwise, there is a disadvantage that it cannot be used in place of the conventional recoil type starter.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an internal combustion engine starting device that eliminates the above-mentioned disadvantages of the conventional technique and has a simple structure and is convenient to use.

Means for Solving the Problems An internal combustion engine starting device according to the present invention rotatably supports a drive member on a support shaft arranged in a case, and attaches both ends of a mainspring to the case and the drive member, respectively. A rotating shaft is rotatably supported by the case in parallel with the support shaft, and a winding member for rotating the drive member in the power storage direction of the mainspring is independently rotatably supported by the rotating shaft. A reverse rotation preventing mechanism that supports a clutch member that engages with the rotating shaft and can slide only in the axial direction, and that prevents the winding member from rotating in a direction opposite to the power storage direction of the mainspring is provided. A lever is provided on the case for engaging the winding member with a spring and having a projection for engaging with the circumferential groove of the clutch member and pivotable to separate the clutch member from the winding member. Wear
An operating member for pivoting the lever is provided, a handle is attached to an outer end portion of the rotating shaft, and the driving member is drivingly connected to the crank shaft.

Therefore, by rotating the handle, the power of the mainspring can be easily stored. Since the rotating shaft is arranged in parallel with the central axis, the whole device is made thin and the structure on the crankshaft side is changed. It can be easily replaced and applied to an internal combustion engine equipped with a normal recoil type starting device and the like.

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

In the illustrated embodiment, as shown in FIG. 1, the starting device 1 has a case 2 formed of a suitable material such as synthetic resin, and the case 2 is screwed to an engine case 3 accommodating an internal combustion engine. Installed by. A crankshaft 4 of the internal combustion engine is arranged in the engine case 3 so as to extend toward the case 2 of the starter 1.

In the case 2 of the starting device 1, a support shaft 5 coaxially extending from the outer end portion thereof toward the crank shaft 4 is integrally formed, and the support shaft 5 serves as a drive member and a large gear 6 Is rotatably supported. The large gear 6 is held by the screw 7 and the washer 8 which are screwed onto the support shaft 5 in the axial direction so as not to be disengaged from the support shaft 5 in the axial direction. The large gear 6 is integrally formed with a boss portion 9 extending rearward thereof, and the boss portion 9 supports a spring 10 for accumulating power. The mainspring 10 has an inner end portion connected to the boss portion 9 and an outer end portion connected to an inner bracket portion 11 of the case 2. Further, the large gear 6 integrally forms a ratchet wheel portion 12 which extends forward from the toothed wheel gear 6 and is disposed coaxially with the crankshaft 4 in proximity to the crankshaft 4. Engages with a spring biased centrifugal pawl 13 which is eccentrically arranged. The ratchet wheel 12 and the centrifugal pawl 13 transmit a relative rotation of the large gear 6 with respect to the crankshaft 4 in the operating rotation direction of the crankshaft 4, but block a relative rotation in the opposite direction. It works as a clutch. The mainspring 10 is arranged so as to store a spring force when the large gear 6 is rotated in a direction opposite to the operating rotation direction of the crankshaft 4.

The case 2 rotatably supports a rotating shaft 14 extending in parallel with the support shaft 5 in the lower part of the case 2. One end of the rotary shaft 14 projects to the outside of the case 2, and a handle 15 is foldably provided at the projecting end. The rotating shaft 14 has a spline shaft portion 16 formed at an intermediate portion thereof, and a ratchet wheel 17 is spline-fitted to the spline shaft portion 16. The ratchet wheel 17 has a bearing portion 18 which is formed integrally with the ratchet wheel 17 and extends in the axial direction, and rotatably supports a small gear 19 as a winding member. Further, a clutch member 20 is spline-fitted to the spline shaft portion 16 of the rotating shaft 14 so as to be supported slidably in the axial direction, and the clutch member 20 is provided between the clutch member 20 and the end wall of the case 2. By means of the compression coil spring 21 acting between
It is biased in the axial direction toward 19 so that the clutch member 20 meshes with the side surface of the pinion 19 at the meshing clutch portion 22. As shown in FIG. 2, the ratchet wheel 17 is engaged with a spring biasing claw 23 pivotally mounted on the case 2, and the ratchet wheel 17 and the ratchet 23 are arranged in a direction for accumulating the mainspring 10. The rotation prevention mechanism is configured to allow rotation of the pinion 19 but prevent rotation in the opposite direction.

Further, in the case 2, a lever 24 composed of a pair of arm members extending laterally near both sides of the clutch member 20.
3, the lever 24 is pivotally attached to the case 2 at its pivot end 25 as shown in FIG.
It is arranged to be pivotable in 14 axial directions. The lever 24 is provided with protrusions 26 projecting inward at the middle portion of each arm member, and these protrusions 26 are loosely fitted in a circumferential groove 27 formed in the clutch member 20. An operation member 29 is provided in a portion of the case 2 near the other end free end portion 28 of the lever 24. The operating member 29 is disposed so as to slide axially through an axial slot 30 formed in the case 2, and the inner end of the operating member 29 engages with the free end 28 of the lever 24. Then, the lever 24 is pivoted counterclockwise with reference to FIG. 3 by pushing the outer end portion of the operating member 29 with a finger, thereby causing the clutch member 20 to act on the compression coil spring 21. By sliding on the spline shaft portion 18 against the clutch member 20 the small gear
It can be separated from 19 and released into a freely rotatable state.

With the above-described configuration, when the handle 15 is manually rotated to rotate the rotating shaft 14 before starting the internal combustion engine,
The clutch member 20 also rotates to rotate the small gear 19, which causes the large gear 6 to rotate to cause the mainspring 10 to store a spring force. When the rotation of the handle 15 is stopped when the mainspring 10 has properly accumulated power, the mainspring 10 is kept in a power accumulation state by the reverse rotation preventing mechanism composed of the ratchet wheel 17 and the pawl 23. When the internal combustion engine is started, the operating member 29 is operated from a suitable outside to pivot the lever 24 against the action of the compression coil spring 21, and the clutch member 20 is released from the engagement with the pinion gear 19. To do.
As a result, the small gear 19 becomes free to rotate and the mainspring
The gear 10 rapidly rotates the large gear 6 by its accumulated force, and this torque is transmitted to the crankshaft 4 via the ratchet portion 12 and the centrifugal pawl 13 to rotate the crankshaft 4 and start the internal combustion engine. it can. After the engine is started, the centrifugal claw 13 is automatically disengaged from the ratchet wheel 12 by the action of centrifugal force. The operating member 29 and the lever 24 are returned to their original positions, the clutch member 20 is re-engaged with the small gear 19, and the handle 15 is rotated to store the power of the mainspring 10.
The next starting operation can be prepared.

Effect of the Invention With the configuration of the present invention described above, the present invention can easily store the power of the mainspring at any time by rotating the handle, and the rotating shaft is arranged in parallel with the support shaft. Since the entire device is made thin, and can be composed of the minimum necessary small and lightweight parts, it can be suitably used as an internal combustion engine starting device for portable and backpack type working machines, and the structure of the crankshaft side There is an effect that it can be used in place of the conventional recoil-type starting device or the like without changing.

[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, FIG. 2 is a cutaway view of a portion of FIG. 1, and FIG. 3 is a transverse sectional view of a portion of FIG. It is a figure. DESCRIPTION OF SYMBOLS 1 ... Starting device, 2 ... Case, 4 ... Crank shaft, 5 ... Support shaft, 6 ... Driving member, 10 ... Mainspring, 14 ... Rotating shaft, 15 ... Handle, 19 ... Winding member, 20 ... Clutch part, 21 ... Compression coil spring, 24 ... Lever, 26 ... Projection, 27 ... Circumferential groove, 17, 23 ... Reverse rotation prevention mechanism, 29 ... Operation member.

Claims (1)

[Scope of utility model registration request] 1. A drive member (6) is rotatably supported by a support shaft (5) arranged in a case (2), and both ends of a mainspring (10) are attached to the case and the drive member, respectively. A rotating shaft (14) is rotatably supported in the case in parallel with the support shaft,
A winding member (19) for rotating the drive member in the power storage direction of the mainspring is rotatably supported independently on the rotating shaft, and can engage with the rotating shaft and slide only in the axial direction. A reverse rotation preventing mechanism (17, 23) that supports the clutch member (20) and prevents the winding member from rotating in a direction opposite to the direction in which the mainspring is stored, is provided with the clutch member by a spring (21). A lever (24) that engages with a winding member and has a protrusion (26) that engages with a circumferential groove (27) of the clutch member and that can pivot to separate the clutch member from the winding member is provided in the case. An operating member (29) pivotally attached to the lever is provided to pivot the lever, and a handle (15) is provided at the outer end of the rotating shaft.
And a driving member connected to the crank shaft in driving manner.