JPH0120309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual starting device for an engine that rotates a recoil starter body by pulling a starter rope and transmits the rotation to a crankshaft via a one-way clutch to start the engine.

As shown in FIG. 1, which is a cross-sectional view of the conventional starting device, the spindle 11 of the recoil starter body 6 is disposed facing each other on an extension of the crankshaft 1, and the spindle 11 of the recoil starter body 6 is arranged so as to protrude into the engine case A. The flange 12 at the end of the support shaft 11 is installed in the starter case 5.
A one-way clutch 10 is provided between the pulley 2 attached to one end of the crankshaft 1 and the starter body 6, which connects the starter body 6 and the pulley 2 so that they can rotate together when the starter body 6 rotates. Consists of structure. In FIG. 1, 6a is a take-up reel, 6b is a starter rope, 6c is a take-up spring, and 8 is a friction plate.

Therefore, in conventional starting devices, the pulley, recoil starter, and starter case are lined up in the axial direction of the crankshaft, so the length in the axial direction including the crankshaft is long, and the starter body cannot be rotated by pulling the rope. When this happens, an extremely large force is applied to the spindle that supports the starter body, so it is necessary to use materials with sufficient strength for the spindle and the starter case, and also to fix the spindle to the starter case. For example, the starting device must be reinforced by being sandwiched between sheet metal members or the like and then welded, resulting in disadvantages such as a complicated structure of the entire starting device and an increase in weight.

Further, as a prior art of this type of starting device, there is a device described in Japanese Utility Model Publication No. 1960-1988, which is basically the same as the device shown in FIG.

This invention was made in view of the above points, and by extending one end of the crankshaft and disposing a recoil starter in this shaft extension, the axial length can be shortened, and the rope can be pulled when starting the engine. By transferring the large force that acts when rotating the starter body to the extension of the crankshaft, the burden on the starter body holding member is reduced, simplifying the structure, reducing weight, making the device more compact, and reducing costs. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings. Fig. 2 is a sectional view showing an embodiment of the starting device, and Fig. 3 is a sectional view taken along the line - - in Fig. 2. In Fig. 2, 1 is a crankshaft, which is a generally cylindrical cylinder with one end opened at one end of the shaft 1. Attach the shaped pulley 2,
Further, one end of the shaft 1 is extended in the axial direction to form an extension portion 3.

Reference numeral 4 denotes a cylindrical holding member having an inner diameter slightly larger than the outer diameter of the shaft extension 3. This holding member 4 is arranged to surround the shaft extension 3, and constitutes a part of the engine case A. One end of the holding member 4 is integrally connected to the starter case 5. A recoil starter main body 6 is rotatably disposed around the holding member 4 within the starter case 5.

By the way, the starter main body 6 has a conventionally known structure, and has a starter rope 6 around the take-up reel 6a.
b is wound, and a take-up spring 6c is interposed between the take-up reel 6a and the starter case 5. Also, a retaining ring 7 is attached to the open end 4a of the holding member 4.
A friction plate 8 is rotatably mounted through the friction plate 8, and a pressing spring 9 is interposed between the friction plate 8 and the starter body 6 to urge the starter body 6 toward the starter case 5 side. Furthermore, between the pulley 2 and the starter body 6, as shown in FIG. 3, a one-way clutch 10 is slidably contacted with a friction plate 8 and pivotally connected to the starter body 6 so as to be deployable outward. an engaging portion 10b that urges the clutch 10 inwardly and can be engaged in a state where the clutch 10 is expanded against the spring 10a due to friction with the friction plate 8 under normal rotation of the starter main body 6; is provided protruding from the inner peripheral wall of the pulley 2.

When the starter body 6 is rotated by pulling the rope 6b, the holding member 4 bends and deforms so that its inner circumferential wall contacts the extension portion 3, and the shaft extension portion 3
For example, the entire holding member 4 may be formed of a flexible member such as a thin synthetic resin or a thin metal plate, or the holding member 4 may be supported by the starter case 5. Connect and support flexibly. Furthermore, the holding member 4 may be made highly rigid, and the member supporting it (the case 5 in FIG. 2) may be made of a flexible member. Therefore, the strength of the holding member 4 is sufficient to support the starter body 6, friction plate 8, clutch 10, etc. in a normal state, that is, in a non-rotating state of the starter body 6.

Next, to explain the operation of the above embodiment, when the starter rope 6b is pulled, the starter body 6 is bent and deformed, and the starter body 6 rotates forward while its inner peripheral wall contacts the shaft extension 3, and at the same time, the clutch 10 is rotated. It is expanded outward and connected to the pulley 2 via the engaging portion 10b, and the crankshaft 1 rotates to start the engine.

In this manner, when the rope 6b is released after the engine is started, the rope 6b is taken up by the take-up spring 6c as the take-up reel 6a reverses. It should be noted that when the take-up spring 6c is reversely rotated, the clutch 10 and the engaging portion 10b are not engaged and the reel 6a rotates idly. Further, the starter body 6 is stopped on the holding member 4 while the engine is operating.

As explained above, the engine starting device of the present invention has a flexible cylindrical shape that extends one end of a rotating shaft such as a crankshaft in the axial direction and has a slightly enlarged inner diameter around the shaft extension. Since a holding member is provided and the recoil starter body is rotatably arranged around the holding member, the axial length including the crankshaft can be significantly shortened compared to conventional starting devices, making the entire engine more compact. In addition, the crankshaft extension bears the large force that acts on the starter's holding member when the starter body is rotated by pulling the rope when starting the engine, and the holding member bears the recoil starter when the starter body is not rotating. Since the functions are differentiated so that only the load is borne, the structure of the starter holding member can be simplified, resulting in effects such as weight reduction and cost reduction.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional general manual engine starting device, Fig. 2 is a sectional view showing an embodiment of the starting device of the present invention, and Fig. 3 is a sectional view taken along the line - - in Fig. 2. . 1...Crankshaft, 2...Pulley, 3
... Shaft extension part, 4 ... Holding member, 5 ... Starter case, 6 ... Recoil starter body, 6
a...Take-up reel, 6b...rope, 6c...
Winding spring, 7... Stop ring, 8... Friction plate, 9... Pressing spring, 10
...One-way clutch, 10a...Spring, 1
0b...Engagement part, A...Engine case.

Claims (1)

[Claims] 1. A starting device that rotates a recoil starter main body by pulling a starter rope and starts the engine via a one-way clutch provided between the main body and the rotating shaft of the engine, comprising: one end of the rotating shaft; A flexible cylindrical holding member with a slightly enlarged inner diameter is provided around the shaft extension by extending in the axial direction, and the starter main body is rotatably disposed around the holding member. A manual engine starting device featuring: