JPH048312Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a recoil starter for starting small engines used in portable working machines and the like.

(b) Prior Art and Problems to be Solved Conventionally, recoil starters used in this type of engine have been installed using a space outside of a bearing that pivotally supports the crankshaft. There was one that made the entire engine more compact and made the reel diameter larger, reducing the pulling force of the starter string wound around the reel to make starting easier. As shown in the figure, a synthetic resin reel 55 is attached to the recoil starter case 43 on the outer periphery of the bearing part 41.
It was fitted and supported through. Therefore, the heat and vibrations of the engine 1 are propagated from the bearing portion 41 to the recoil starter case 43 and the reel 55, causing damage to the reel 55 and the recoil starter case 55.

(c) Means and operation for solving the problem The present invention includes a recoil starter case that is supported by a case that supports the engine, and a reel rotatably supported by the recoil starter case that is attached to the outer periphery of the bearing. They are positioned with a gap to prevent engine heat and vibrations from being directly transmitted to the reel.

(d) Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2, a crankshaft 9 is pivotally supported by a crankcase 3 of an engine 1 via bearings 5 and 7. As shown in FIGS. A crank arm 11 is fixed to the inner end of the crankshaft 9.
1, one end of a connecting rod 13 is fixed. The other end of the connecting rod 13 is pivotally connected to a slidable piston 17 within a cylinder 15 fixed to the crankcase 3. The other side of the crankcase 3 is connected to a carburetor 19 via a reed valve 21 . At the outer end of the crankshaft 9, a rotating body 23 is attached to a female threaded body 2.
It is fixed by 5. A support 29 of the centrifugal clutch 27 is mounted on the outer side of the rotary body 23 with a female threaded body 2.
They are jointly fastened by 5. An ignition sensing coil 31 that is sensitive to a magnet (not shown) embedded in a portion of the outer periphery of the rotating body 23 is provided close to the outer periphery of the rotating body 23. Fans 33, 33, . . . are fixed to the outside of the rotating body 23. A clutch drum 35 close to the outer periphery of the centrifugal clutch 27 is rotatably supported on the outer periphery of the female threaded body 25. A transmission shaft 39 is connected to the outer surface of the clutch drum 35 via a vibration isolator 37.
An annular shape is formed between the crankcase 3 and the rotating body 23 and surrounds the outer periphery of a bearing part 41 that extends integrally from the crankcase 3 toward the rotating body 23 and supports the bearings 5 and 7 with an appropriate gap. A recoil starter case 43 made of synthetic resin and having a section 42 is provided. A case 45 is provided to cover the outer periphery of the engine 1, and the case 45 is separated by a right case 47 by a vertical dividing plane that includes the center line of the crankshaft 9.
and the left case 49, and a screw (not shown)
are connected by. Engine 1 is vibration isolator 5
1 within the case 45. Further, the recoil starter case 43 is locked to the case 45 by a locking portion 53 provided on the outer periphery, and the crankcase 3 is locked to the case 45 by a projection 54 provided on the inner surface.
rotation is locked. A reel 55 is rotatably supported on the annular portion 42 of the recoil starter case 43, and by pulling a starter handle (not shown) at the outer end of a starter string 57 wound around the reel 55, a spiral spring 59 is activated. The reel 55 is configured to rotate against this, and this annular portion 42 has a plurality of notch grooves 60, 60, 6 in the axial direction.
The reel 55 is locked by locking protrusions 62, 62, 62 which are formed by cutting out the end of the reel 55 and protrude from the outer surface of the end. A swingable pawl 61 is detachably engaged with the inner surface of the rotating body 23 to transmit rotation in only one direction to a ratchet 63 provided on the outer surface of the reel 55. 63 in the direction of pressing.

In the above embodiment, when the starter handle (not shown) is pulled, the starter string 57 is pulled, the reel 55 is rotated, the ratchet 63 and the pawl 61 are engaged, and the rotating body 23 is rotated. The crankshaft 9 fixed to the rotating body 23 rotates and the engine 1 is started. When the engine 1 starts, the pawl portion 61 is pushed away by the ratchet 63 and disengaged, and is held in the released position by centrifugal force. When the rotation of the engine 1 is increased to a predetermined rotation speed, the centrifugal clutch 27 connects to the clutch drum 35, and the power is transmitted to the transmission shaft 39 via the vibration isolator 37.
is transmitted to. Since a gap is provided between the bearing portion 41 of the crank case 3 of the engine 1 and the annular portion 42 of the recoil starter case 43,
Heat and vibrations of the crankcase 3 are not transmitted to the recoil starter case 43 and the reel 55.

(e) Effects of the invention Since the invention has the configuration as stated in the claims, the recoil starter is installed using the outer space around the bearing, making the entire engine compact. In addition, the reel diameter has been increased to reduce the pulling force on the starter cord, making it easier to start, and to directly transmit heat and vibrations from the engine crankcase to the synthetic resin reel and recoil starter case. It is possible to prevent damage by preventing

Note that FIG. 3 shows a conventional example, in which the annular portion 42 of the recoil starter case 43 is connected to the bearing portion 41.
Since it is directly fitted and supported by the recoil starter case 43, the heat and vibrations of the crankcase 3 are transmitted to the recoil starter case 43.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

1 and 2 are a side sectional view and a plan sectional view of one embodiment of the present invention, respectively, and FIG. 3 is a side sectional view of a conventional example. 1...Engine, 3...Crankcase, 9...
... Crankshaft, 23 ... Rotating body, 41 ... Bearing section, 42 ... Annular section, 43 ... Recoil starter case, 45 ... Case, 55 ... Reel.

Claims (1)

[Scope of utility model registration request] Rotating body 2 fixed to crankshaft 9 of engine 1
3 and the crankcase 3, integrally extending from the crankcase 3 toward the rotating body 23,
A recoil starter case 43 is provided with an annular portion 42 surrounding the outer periphery of a bearing portion 41 that pivotally supports the crankshaft 9 with an appropriate gap, and a reel 55 is rotatably directed around the outer periphery of the annular portion 42. and the rotary body 23 are provided in a removably engaged manner so as to transmit rotation in only one direction, and the recoil starter case 43 is provided to support the case 45 that supports the engine 1. Features a recoil starter.