JPH0213753Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a recoil starter mounting mechanism for small engines (agricultural engines, etc.) used in lawn mowers, etc. It increases the strength of the recoil starter, and also improves the position of the pinion gear in the recoil starter. The purpose is to increase accuracy.

In general, Bendex type recoil starters have a structure in which the pinion gear on the rope reel shaft engages with the ring gear of the flywheel by protruding radially inward toward the center of the flywheel. The method of attaching the recoil starter to the crankcase is to insert the tip of the rope reel shaft into the hole in the crankcase and secure it, or
The method involved attaching a flange to the edge of the recoil starter cover on the crankcase side and bolting this flange to the crankcase. However, this case has the following drawbacks. (1) The recoil starter cover has large vibrations and lacks durability. (2)
Since the strength of the recoil starter cover is low, it is not possible to attach a fuel tank or other engine auxiliary parts to the recoil starter cover. (3) If the tip of the rope reel shaft is not inserted into the hole in the crankcase, it is difficult to position the pinion gear.

The present invention is a Bendex type recoil starter in which both the recoil starter cover and the rope reel shaft are fixed to the crankcase, and will be explained below with reference to the drawings.

Fig. 1 is a front view, Fig. 2 is a partial cross-sectional view of Fig. 1, and Fig. 1 shows the cover 2 of the recoil starter 1 and auxiliary parts, such as upper and lower brackets 3 and 4 for mounting the fuel tank. , a recoil starter handle 5, and a friction spring 6. The recoil starter cover 2 is a cup-shaped sheet metal member that opens toward the crankcase 7 as shown in FIG. It is fastened to the side of 7.
A horizontal portion 3a of an L-shaped bracket 3 is welded to the flat upper surface of the cover 2, and a nut 10 is welded to the vertical portion 3b. A substantially L-shaped bracket 4 is provided on the substantially circular vertical portion 2a of the cover 2.
is welded to the horizontal part 4a of the bracket 4, and two holes 11 for mounting a fuel tank are provided in the horizontal part 4a of the bracket 4.

A substantially horizontal rope reel shaft 13 passes through the central hole of the cover vertical portion 2a, and a flange 14 of the shaft 13 is welded to the cover vertical portion 2a. The tip of the shaft 13 fits into a hole 15 provided in the crankcase 7 and is fixed to the crankcase 7 with a screw 16. 17 is a snap spring for positioning. A rope reel 19 is rotatably fitted onto the shaft 13 within the cover 2, and a return spring 20 is installed between the rope reel 19 and the cover vertical portion 2a to return the rope reel 19 to the standby position shown. One end of the rope 21 wound around the rope reel 19 is fixed to the rope reel 19, and the other end extends upward through a guide 22 provided on the upper wall of the cover 2 and is connected to the handle 5.

The pinion gear 25 meshes with the helical spline 24 provided on the boss cylinder 23 of the rope reel 19, and the pinion gear 25 is moved by the elasticity of the return spring 27 compressed between the pinion gear 25 and the spring receiver 26.
normally rests at the standby position shown in the figure, where it is in pressure contact with the rope reel 19. The circular arc portion 6a of the friction spring 6 is inserted into the annular groove 27' provided in the pinion gear 25.
are elastically fitted, and the U-shaped protrusion 6 of the spring 6
b is supported by the inner surface of the corner portion of the cover 2 as shown in FIG. 1, thereby preventing the rotation of the spring 6 and allowing the spring 6 to apply an appropriate amount of friction to the pinion gear 25.

The lower end of the pinion gear 25 is spaced apart from and faces a ring gear 30 of a flywheel 29 fixed to a substantially vertical crankshaft (not shown) perpendicular to the rope reel shaft 13.

To start the engine, return spring 20 (second
Pull up the handle 5 against the elastic force shown in the figure. Then, the rope 21 is pulled out from the rope reel 19, and the rope reel 19 rotates.
Since the pinion gear 25 is prevented from rotating by the frictional force of the friction spring 6, the pinion gear 25 is prevented from rotating by the action of the helical spline 24.
The crankcase 7 resists the elasticity of the return spring 27.
The pinion gear 25 protrudes to the side (to the right as indicated by the arrow A in FIG. 2), and the pinion gear 25 meshes with the ring gear 30 to provide starting rotation to the flywheel 29. When the engine starts, the pinion gear 25 is returned in the opposite direction A by the reaction force from the ring gear 30 and the elasticity of the return spring 27.

Engine vibration during engine operation is caused by vibrations from the crankcase 7 to the recoil starter cover 2,
It is transmitted to the fuel tank 32 via the brackets 3, 4 and grommets 37, 34, and is buffered by the recoil starter cover 2 and grommets 37, 34.

As explained above, in the present invention, in an engine having a Bendex type recoil starter, one end of the rope reel shaft 13 is extended and inserted into the hole 15 of the crankcase 7, and the other end of the rope reel shaft 13 is inserted and fixed. Since the flange 8 is attached to the recoil starter cover 2 supported at the end and the flange 8 is fastened to the crankcase 7, both the rope reel shaft 13 and the recoil starter cover 2 are attached to the crankcase 7. It is rigidly fixed, thereby greatly increasing the strength of the recoil starter, and ensuring the positioning of the pinion gear 25. The pinion gear 25 and ring gear 30 mesh smoothly during starting, making starting easy and light. Durability is also improved. Also cover the recoil starter 2
Since the helical spline 24 is almost completely surrounded by the helical spline 24, it is difficult for dust etc. to adhere to the helical spline 24, which has the advantage that its operation can be performed stably and reliably for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a front view with the fuel tank removed, FIG. 2 is a partial cross-sectional view taken from FIG. 1, and FIG. 3 is an exploded perspective view of the main parts. 1... Recoil starter,
2... Recoil starter cover, 7... Crank case, 8... Flange, 13... Rope reel shaft.

Claims (1)

[Scope of utility model registration request] In an engine with a bendix type recoil starter, one end of the rope reel shaft is extended to insert and fix the crankcase, and a flange is attached to the recoil starter cover supported at the other end of the rope reel shaft. A recoil starter mounting mechanism characterized by a flange fastened to the crankcase.