JPS643788Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a small engine having a contact type ignition device.

(Prior art) For example, in a small general-purpose engine, as shown in Fig. 1, not only the cylinder 2, the cylinder head 1, and the crankcase 3 are each divided, but also the crankcase 3 is divided into left and right parts in the drawing. There is a model. These multi-segmented engines are not only disadvantageous in terms of cost, but also have poor workability during maintenance and inspection, and are also disadvantageous in that they require gasket replacement and adjustment between each part during assembly. Therefore, as an alternative, cylinder head 1 and cylinder 2
We are considering an engine in which the crankcase 3 and crankcase 3 are integrated, but in the case of this integrated type, only the crankcase 3 needs to be disassembled as described above, so the crankcase 3 is divided into two parts. However, if the crankcase 3 is divided into left and right parts, the above-mentioned integration cannot be achieved.

This upper and lower division is performed at the penetrating portion of the crankshaft 4, but in that case, the following problem arises when disassembling the crankcase 3.

In other words, in this type of engine, the magnetic flywheel 6 is attached to one end of the crankshaft 4, but in the conventional case, a contact cover is provided on one side of the crankcase 3, which is the inner side of the magnetic flywheel 6. In addition to the contact part 10, an ignition coil 9 with a coil mounting plate 21 was attached by means of a fitting 15. In this case, the coil mounting plate 21 and the ignition coil 9 are circular and are attached to the upper and lower parts of the crankcase 3 so as to surround the outer periphery of the crankshaft 4, so when the crankcase 3 is disassembled vertically, In this case, it is necessary to remove the magnetic flywheel 6, as well as the coil mounting plate 21 and the ignition coil 9, which makes the work complicated.

(Purpose of the invention) This invention was made in view of the above-mentioned problems, and its main purpose is to enable easy disassembly of the crankcase without removing the flywheel or ignition device.

(Structure of the invention) In order to achieve the above object, this invention arranges the ignition coil of the contact type ignition device radially outward of the magnetic flywheel and facing the outer circumferential surface of the magnetic flywheel. The contact parts are fixed to only one of the upper and lower halves of the crankcase at a position corresponding to the radially inward side of the magnetic flywheel, and a contact cover covering the above contact parts is attached.
The cover is divided into an upper cover attached to the upper half of the crankcase and a lower cover attached to the lower half of the crankcase, and the upper cover and the lower cover overlap each other.

(Example) Hereinafter, the illustrated example of this invention will be described.

Figure 2 shows a general-purpose small air-cooled engine.
The engine body E has a cylinder head 1, a cylinder 2, and an upper half 3a of a crankcase 3 integrated, and a lower half 3b of the crankcase 3 is detachably attached to these through a dividing surface L. . A crankshaft 4 is rotatably supported through the penetrating portion between the upper half 3a and the lower half 3b, and a magnetic fly having a cooling fan 5 is attached to an end protruding to one side of the crankcase 3. While the wheel 6 is installed, the wheel 6
A recoil starter 7 is mounted axially outward. These recoil starter 7 and magnetic flywheel 6 are covered, and the cooling air is directed to the cylinder 2.
A fan cover 8 is provided to guide the fan to the side. An ignition coil 9 is installed using the space inside the fan cover 8, and in this case, the ignition coil 9 is
It is mounted on the cylinder 2 side radially outward of the magnetic flywheel 6 and facing the outer peripheral surface thereof, and correspondingly, the magnet 6a of the magnetic flywheel 6 is arranged on the outer peripheral part. ing.

On the other hand, the contact part 10 of the contact type ignition device is attached only to the upper half 3a side of the crankcase 3, and this contact part 10 is attached to the radially inner side of the magnetic flywheel 6 on one side of the crankcase 3. is placed in a position corresponding to

A contact cover 11 that covers the contact parts 10 of the contact type ignition device is made of resin or a steel plate, and as shown in FIG. and a lower cover 11b attached to the lower half 3b of the crankcase 3, and an upper cover 11a and a lower cover 1.
1b are assembled in a mutually overlapping state as shown in FIG. Here, 12
13 is a shaft insertion hole, and the cover upper part 11a and cover lower part 11b are overlapped to form one circular hole.
It protrudes from each of the upper half 3a and lower half 3b and is inserted into each pin hole 14 of the upper cover 11a and lower cover 11b. This locking pin 13
When crankcase 3 is disassembled, the mounting bracket 1
5, the upper cover 11a and the lower cover 11b
Maintain this posture.

Therefore, in the above configuration, as shown in FIG. The contact cover 11 is fixed only to one side, and the contact cover 11 is attached to the upper half 3a of the crankcase 3.
1a and a lower cover half 11b attached to the lower half 3b, regardless of the presence of these contact components 10 and contact cover 11,
The crankcase 3 can be disassembled vertically. Furthermore, when the crankcase 3 is assembled, the contact part 10 remains in the same state as before disassembly, so there is no need to adjust the ignition timing. Furthermore, the cover upper part 11a and the cover lower part 11b are
Since they are not simply butted together but are lapped together, their airtightness is high, and therefore the operability of the contact component 10 can be effectively maintained even though it is a split type cover.

In addition, the cover upper part 11a and the cover lower part 11
b is provided with an inclined guide portion 16 shown in FIG. 4 to facilitate fitting into each other. In addition to the above-mentioned embodiment, as shown in FIG. In addition to being a fit-in type, an upper cover plate 19 and a lower cover plate 20 that close the respective openings may be configured to overlap with each other as shown in FIG.

(Effect of the invention) As explained above, the ignition coil of the contact type ignition device is arranged radially outward of the magnetic flywheel and facing the outer peripheral surface thereof, and the contact parts of the contact type ignition device are The contact cover is fixed only to the upper and lower halves of the crankcase at positions corresponding to the radially inward part of the magnetic flywheel, and the contact cover is attached to the upper part of the cover attached to the upper half of the crankcase and the crankcase. The lower part of the cover is attached to the lower half of the crankcase, and these two covers overlap each other, so the crankcase can be easily disassembled without removing the flywheel or ignition device. It became.

[Brief explanation of the drawing]

Fig. 1 is a side view partially showing a conventional small engine, Fig. 2 is a side sectional view of a small engine showing an embodiment of this invention, Fig. 3 is a front view of a split type contact cover, Figure 4 is Figure 3 - sectional view,
FIG. 5 is a front view showing another example of the split type contact cover, and FIG. 6 is a sectional view taken along the line shown in FIG. 5. 3...Crankcase, 3a...Upper half, 3b...Lower half, L...Divided surface, 4...Crankshaft, 6...
Magnetic flywheel, 9...Ignition coil, 1
0...Contact parts, 11...Contact cover, 11a...Cover upper part, 11b...Cover lower part.

Claims (1)

[Scope of utility model registration request] In a small engine in which the crankcase is divided into an upper half and a lower half at the penetration part of the crankshaft, and a magnetic flywheel is attached to the crankshaft, the ignition coil of the contact type ignition device is connected to the ignition coil of the contact type ignition device. The contact part of the contact type ignition device is placed in the upper half of the crankcase at a position corresponding to the radially inward side of the magnetic flywheel. The contact cover that covers the contact parts is divided into an upper cover attached to the upper half of the crankcase and a lower cover attached to the lower half of the crankcase. A small engine characterized in that the upper part of the cover and the lower part of the cover overlap each other.