JPS6132096Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gasoline engine generator, and more particularly to a portable small-sized generator.

As is well known, gasoline engines drive generators, and the electricity is used to perform work such as welding on-site. Therefore, gasoline engine generators are extremely convenient if they are lightweight and small, and both gasoline engines and generators use a lot of plastic materials and light metals to be as compact and compact as possible.
Keeps it lightweight.

However, since gasoline engines are manufactured by engine manufacturers and generators by electrical manufacturers, the connection between the two has blind spots in terms of durability, productivity, cost, etc. Therefore, in order to eliminate this blind spot, the inventors of the present invention
We devised a gasoline engine generator as shown in Figures 1 and 2. To explain this first, 1
1 is a cylinder block of a general-purpose gasoline engine. A crankshaft 2 with pistons and connecting rods connected inside is mounted horizontally, and one end has a flywheel (not shown).
is fixed, and the other end protrudes into the generator 3 and serves as a PTO. A side cover 4 is fixed to the side of the cylinder block 1 with a large number of bolts.
On the outside of the side cover 4, as shown in FIG. 2, generator mounting bosses of arcuate pieces 5 are integrally molded by die-casting in the same number as the through bolts 6 of the generator 3. A through-bolt screw hole 7 is formed in each of the arcuate segments 5, and a gap 8 is provided between adjacent arcuate segments 5 to serve as a passage for cooling air. Then, an annular band 10 having a large number of long cooling holes 9 is wrapped around the outer periphery of this arc-shaped piece 5. With this configuration, the die-casting direction is only in the axial direction of the crankshaft 2, and the mold can be made as small as possible.

In the conventional invention as described above, the band 10 is manufactured by punching long holes 9 for cooling into a band-shaped sheet metal, and this is bent into an annular shape, so that there is a possibility that the connecting part 11 of the band 10 will crack and break. It was hot.

Therefore, the present invention eliminates this drawback and provides a side cover 4 in which the number of die-casting directions is reduced.

An embodiment of the present invention will be described with reference to FIGS. 3 and 4. A bowl-shaped front cover 12 is attached to the side lid 4.
is integrally molded by die casting, and long holes 15 for cooling are provided from the peripheral side part 13 to the curved part 14 of the bowl. With this configuration, when molding the side lid 4, the side lid 4, the front cover 12, and the elongated hole 15 can be molded at the same time using a pair of molds facing each other in the direction of the crankshaft 2.

Reference numeral 16 denotes a bridge portion extending from the front cover 12, on which the band 10 is wound.

The band 10 of the present invention, as shown in FIG.
It consists of a strip cover 18 made of sheet metal and a protrusion 17 extending outward from one side edge of the cover 18, and a long hole 9 for cooling is punched into the protrusion 17. The protruding portion 17 is adapted to engage with a notch 19 of the front cover 12. With this configuration, when the band 10 is bent along the outer periphery of the bridge portion 16, the bending radius is determined by the bending of the band cover 18, and concentrated bending stress is applied to the protruding portion 17 having a large number of long cooling holes 9. This prevents the breakage accident from occurring. Further, in the conventional example, the number of connecting portions 11 was small, but this connecting portion 11 was enlarged by the band plate cover 18, making it more durable.

In summary, the present invention integrally molds the side cover of the engine and the bowl-shaped front cover by die-casting, provides long cooling holes from the circumferential side to the curved part of the cover, and provides the cooling long holes in the circumferential side. Since this is a gasoline engine generator, the outer shell of the generator is wrapped around a sheet metal band having a comb-shaped protrusion with open holes, so it has the following effects.

Since the front cover of the generator is integrally molded with the side cover by die-casting, and there is no need to provide a mold for the long cooling holes, productivity can be improved and production costs can be reduced.

Since the long cooling holes are drilled only in the protruding part of the sheet metal band, breakage due to bending near the long cooling holes can be prevented, and since the band is wrapped around the circumferential side of the front cover, , can be made into a robust and compact gasoline engine generator.

[Brief explanation of drawings]

Figure 1 is a partially sectional side view of the conventional example;
3 is a sectional view of an embodiment of the present invention, and FIG. 4 is a perspective view of essential parts of an embodiment of the present invention. 4...Side cover, 10...Band, 12...Front cover, 13...Surrounding side part, 14...Curved part, 9,
15...Long hole for cooling, 17...Protrusion.

Claims (1)

[Scope of utility model registration request] The side cover of the engine and the bowl-shaped front cover are integrally molded by die-casting, and long cooling holes are provided from the circumferential side to the curved part of the cover, and a protrusion with the cooling long holes is provided on the circumferential side. A gasoline engine generator with a comb-shaped sheet metal band wrapped around it as the outer shell of the generator.