JPS6142496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor generator having a generator driven by an engine.

In a portable small power generator, one end of the generator shaft is directly connected to the engine crankshaft, and a fan for cooling the generator is attached to the other end of the generator shaft. Conventionally, in order to attach a cooling fan to the generator shaft, the end of the generator shaft was tapered and a keyway was provided on this tapered surface, and a similar taper and keyway were also machined on the inner surface of the generator's support shaft. However, machining these tapers and keyways increases the number of man-hours, leading to an increase in price, and also requires troublesome work such as keyway alignment and key insertion for assembly. Furthermore, this conventional construction requires special removal tools for disassembly.

It is an object of the present invention to solve these problems and provide a cooling fan mounting device that does not require any processing that would cause an increase in price and can be easily assembled and disassembled. be.

That is, in the present invention, the generator shaft is hollow, and the generator shaft is held with one end pressed against the crankshaft by a bolt that passes through the generator shaft and is screwed into the engine crankshaft. The generator shaft is supported in the casing by a bearing near the other end, and a support shaft of a cooling fan is fitted to the other end of the generator shaft. The support shaft of the cooling fan is held by the bolt with one end pressed against the inner ring of the bearing through the seat plate.

In the present invention, the cooling fan is held on the generator shaft only by frictional force, but in a portable small-sized power generator, if the fan is made lightweight from synthetic resin or light metal, Its inertia is small and its holding force is sufficient.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, the generator section of the motor generator is:
It has a generator shaft 1, one end of which is connected to a crankshaft 2 of an engine. The generator shaft 1 is supported by a bearing 4 in the generator casing 3 near the other end. The generator cooling fan 5 is made of synthetic resin and is connected to a metal support shaft 6 with bolts 7. The support shaft 6 is hollow and the generator shaft 1
, and one end is pressed against the inner ring 4a of the bearing 4.

The generator shaft 1 is also hollow, and a through bolt 8 is inserted into the interior thereof and screwed onto the end of the engine crankshaft 2. A seat plate 9 is arranged between the head 8a of the bolt 8 and the cooling fan support shaft 6.
receives the tightening force from the bolt 8 via this seat plate 9, and is pressed against the inner ring 4a of the bearing 4. A tapered surface 2a is machined on the end of the engine crankshaft 2, and a corresponding tapered surface 1a is machined on the inner surface of the end of the generator shaft 1. , the washer 9, the support shaft 6, and the inner ring 4a of the bearing 4 receive a tightening force and are pressed against the crankshaft. The joint between the generator shaft 1 and the engine crankshaft 2 may be locked with a key.
Note that the connection between the cooling fan and the support shaft is not bolted as described above, but the support shaft 6 may be embedded in the fan 5 at its flange portion 6a, as shown in FIG. As shown in FIG. 3, the fan 5 and the support shaft 6 may be integrally molded from synthetic resin or light metal.

In the present invention, since the cooling fan support shaft and the generator shaft are connected by fitting the cylindrical shaft, there is no need for tapering and keyway machining of the shaft as in the past, and it can be formed at low cost. At the same time, assembly and disassembly are extremely easy, and the structure is optimal for mounting a cooling fan made of lightweight material such as synthetic resin.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a generator section of a motor generator showing one embodiment of the present invention, and FIGS. 2 and 3 are sectional views showing different fan structures. 1... Generator shaft, 2... Engine crankshaft,
3...Casing, 4...Bearing, 5...Cooling fan, 6...Support shaft, 8...Bolt.

Claims (1)

[Claims] 1. A motor generator in which a generator shaft is directly connected at one end to an engine crankshaft, and a fan for cooling the generator section is attached to the other end of the generator shaft, wherein the generator shaft is hollow. The other end of the generator shaft is supported by the generator casing by a bearing, a support shaft of a cooling fan is fitted to the other end of the generator shaft with one end butting against the inner ring of the bearing, and a bolt is attached to the generator shaft. A motor generator characterized in that the motor generator is inserted through and screwed into the crankshaft, and presses the support shaft of the cooling fan against the inner ring of the bearing through a seat plate, and simultaneously presses and holds the generator shaft against the crankshaft. Cooling fan mounting device. 2. The cooling fan mounting device according to item 1 above, wherein the cooling fan is made of synthetic resin, is formed separately from the support shaft, and is bolted to the support shaft. 3. The cooling fan device according to item 1 above, wherein the cooling fan is made of synthetic resin and the support shaft is partially embedded in the cooling fan. 4. In the above item 1, the cooling fan is a cooling fan mounting device integrally molded with the support shaft.