JPH0232870Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention consists of attaching a flywheel equipped with a cooling fan to the upwardly projecting end of the crankshaft supported vertically in the crankcase, and This invention relates to a device for attaching a recoil starter to a vertical shaft type engine having a protruding output shaft in the same direction.

<Prior art> Conventionally, the recoil starter of the above-mentioned engine is started by engaging a drum fixed to the flywheel with a claw that protrudes centrifugally from the upper surface of the wind guiding casing that covers the flywheel as the recoil wheel rotates. It is common to install a conventional recoil starter that transmits rotational force.

<Problems to be Solved by the Invention> However, according to the conventional recoil starter mounting structure described above, the recoil starter protrudes significantly above the wind guiding casing, resulting in a problem that the overall height of the engine increases.

The present invention aims to reduce the overall height of the engine by introducing a Bendix-type recoil starter into the vertical shaft type air-cooled engine, and also allows the recoil starter to be assembled to the flywheel ring gear with high precision. It's very detailed.

<Means for Solving the Problems> In order to achieve the above object, the present invention uses a Bendix-type recoil starter in which a drive gear that can engage with a ring gear fixed to a flywheel is movable up and down. is arranged on the side of the flywheel, and the mounting flange provided on this recoil starter is configured to be bolted and fixed to a pair of bosses provided on the crankcase from above and below, and at a position corresponding to the middle of these two bosses. In addition, a boss for driving the dowel pin is formed near the imaginary line connecting the crankshaft center and the recoil starter shaft center, and a dowel pin fitting hole is formed in the flange of the recoil starter between the pair of bolt attachment parts. The structure was formed by positioning the

<Operation> According to the above configuration, the recoil starter is placed at approximately the same level as the flywheel,
There is no longer anything protruding above the casing that covers the flywheel.

When assembling the recoil starter, first fit the dowel pin driven into the crankcase into the fitting hole provided on the flange, then swing the recoil starter left and right on the horizontal inner surface around this dowel pin, and bolt the recoil starter. Align the holes and tighten the bolts. In this case, since the dowel pin position is set near the imaginary line connecting the crankshaft center and the recoil starter shaft center, even if the bolt hole alignment is varied, the distance between the crankshaft center and the recoil starter shaft center is The distance remains largely unchanged and well within gear fit tolerances.

<Embodiment> FIG. 5 shows an entire front view of a vertical shaft type air-cooled engine to which the present invention is applied, and FIG. 1 shows a partially cutaway plan view thereof.

This engine body 1 includes a crankcase 2 made of aluminum die-casting, in which a cylinder portion 2a is integrally molded.
A crankshaft 3 is vertically supported through the shaft, the downwardly projecting end of the crankshaft 3 is configured as an output shaft 4, and a flywheel 6 with a cooling fan 5 integrally molded is attached to the upwardly projecting end. .

The upper part of the engine body 1 is covered with a bonnet 8 having a dust-proof intake port 7, and a cowling 9 is attached to guide the cooling air sucked in by the cooling fan 5 to the cylinder section 2a and cylinder head section 2b. .

In addition, a fuel tank 10 is located at the rear of the engine body 1.
is disposed so as to be covered by the rear part of the bonnet 8, and an air cleaner 11 and a muffler 12 are disposed on the sides of the engine body 1, covered with upper covers 13 and 14, respectively.

As a starting device for the engine with the above configuration,
A Bendix type recoil starter 15 is used. As shown in FIG. 2, this recoil starter 15 includes a bottom cover 16 and a drum-shaped casing 17.
A recoil pulley 20, which is rotated and returned by a spring spring 19, is loosely fitted onto the vertical support shaft 18 that has been fixed in place, and a boss portion of the pulley 20 is capable of rotating integrally with the pulley 20 and sliding up and down. The drive gear 21 is engaged and supported by the support shaft 1, and the protrusion 21a provided on the boss of the drive gear 21 is connected to the support shaft 1.
Sleeve 23 frictionally fixed to 8 via spring 22
The starting rope 2 led out from the casing 17 is configured to engage with the spiral cam 24 of
When the recoil pulley 20 is rapidly rotated by pulling out the recoil pulley 20, the driving gear 21 rotated accordingly moves downward by a spiral cam action and meshes with the ring gear 26 fixed to the flywheel 6.
As the pulley 20 continues to rotate, the rotation of the pulley 20 is transmitted to the ring gear 26 via the drive gear 21. Note that during gear rotation after the drive gear 21 engages with the ring gear 26, the sleeve 23 is forcibly rotated against the support shaft 18 against the frictional force. Further, when the pulley 20 is released by releasing the rope pull-out, the spring spring 19 causes the pulley 20 to rotate back, and the drive gear 21 is also rotated in the reverse direction and moved upward to the original position by the action of the spiral cam. Further, the ring gear 26 is connected to an opening 27 formed in the side of the casing 17.
The inside has been invaded. Also, casing 17
A rope guide 29, which also serves as a holder for setting the start knob 28, is protruded from the outer peripheral surface of the start knob 28.

Next, the mounting structure of the recoil starter 15 will be explained.

A part of the lower peripheral edge of the casing 17 extends outward to form a mounting flange 30, into which a pair of front and rear nuts 31, 31 for inserting bolts from below are welded and fixed. Fitting hole 3 for positioning pin in the middle
2 is formed.

On the other hand, on one side of the upper part of the crankcase 2, a pair of bosses 35, 3 are provided with a hole 34 through which the bolt 33 attached to the nut 31 is inserted from below.
5, and a boss 38 having a driving hole 37 for a dowel pin 36 that fits into the fitting hole 32.

The knock pin driving hole 37 is provided in the vicinity of an imaginary line X connecting the crank shaft center _P1 and the recoil starter shaft center _P2 .

Further, a screw shaft portion 39 passes through the bottom cover 16 from the head of a bolt 39 for assembling the sleeve 23 to the support shaft 18.
A is extended, and a stay 40 is installed across this and the side surface of the crankcase 2 to improve the mounting strength.

The bolt 33 for attaching the recoil starter may be attached from above the flange 30 and screwed into the boss 35 on the crankcase 2 side.

<Effects of the invention> As explained above, the present invention employs the Bendix type recoil starter for a vertical shaft air-cooled engine, which allows the recoil starter to be installed at the same level as the flywheel, reducing the overall height of the engine. However, it became possible to suppress
In particular, when installing this recoil starter, a knock pin is installed close to the imaginary line connecting the crankshaft center and the recoil starter shaft center, and the bolts are tightened on both sides. The bolt holes can be aligned by the oscillation of the starter, and the ring gear and recoil starter can be easily positioned and assembled while maintaining the accuracy of the distance between the axes.

[Brief explanation of the drawing]

Fig. 1 is a cutaway plan view of the main parts of a vertical shaft type air-cooled engine that is the object of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of the upper part of the crankcase, and Fig. 4 The figure is an overall perspective view of the recoil starter, and FIG. 5 is an overall front view of the engine. 2...Crank case, 3...Crankshaft, 4
... Output shaft, 5 ... Cooling fan, 6 ... Flywheel, 15 ... Recoil starter, 21 ... Drive gear, 26 ... Ring gear, 30 ... Mounting flange, 32 ... Fitting hole, 35 ...Boss, 3
6... Knock pin, 38... Boss, P ₁ ... Crank shaft center, P ₂ ... Recoil starter shaft center, X...
...imaginary line.

Claims (1)

[Claims for Utility Model Registration] A flywheel 6 equipped with a cooling fan 5 is attached to the upwardly protruding end of the crankshaft 3 supported vertically on the crankcase 2, and a vertically oriented output shaft 4 is mounted on the bottom surface of the crankcase 2. In a vertical shaft type air-cooled engine having a protrusion, a ring gear 26 is fixed to the flywheel 6, and a Bendix type recoil starter 15 is provided, in which a ring gear 26 is fixed to the flywheel 6, and a drive gear 21 that can engage with the ring gear 26 is internally movable up and down. A mounting flange 30 provided on the side of the flywheel 6 and provided on the recoil starter 15 is configured to be bolted and fixed to a pair of bosses 35 provided on the crankcase 2 from above and below. A boss 38 for driving _the dowel pin ₃₆ is formed at an intermediate position and in the vicinity of the imaginary line A recoil starter mounting device for a vertical shaft type air-cooled engine, characterized in that a fitting hole 32 of a knock pin 36 is formed so as to be located between a pair of bolt mounting portions.