JPS603656Y2 - Engine charging generator cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a charging generator that is integrally installed in an engine.

The output of a generator depends on the temperature of the generator.

Also, the more you try to increase the output, the more heat will be generated.

Therefore, how to lower the temperature of the generator becomes a serious problem.

Generally speaking, charging generators that are operated by being directly connected to the engine have a sealed structure, and there is currently little cooling required.

The purpose of this invention is to perform forced cooling of the generator and improve the generator output without changing the current engine structure.The generator cover 4 is fixed to the crankcase 1, and the crankshaft 2 is Crankcase 1 at the end of
A cup-shaped power generation rotor 8 that opens in the opposite direction is fixed, and a stator 13 with a coil is fixed to a boss 14 on the inner surface of the cover 4 that faces toward the crankcase 1 and faces the inside of the power generation rotor 8. A screw hole 22 is provided at the end of the crankshaft in the charging generator 3 and communicates with the oil hole 17 in the crankshaft 2.
A bolt 11 with a washer 12 is screwed into this screw hole 22 to fit and tighten the rotor boss 9 to the tapered part 10 on the outer periphery of the end of the crankshaft. Space 24 between bolts 11 is filled with washer 1
2, an oil hole 23 connecting the screw hole 22 and the space 24 is provided in the bolt 11, an oil hole 25 is provided in the rotor boss 9 in the rotor radial direction from the space 24 toward the inner surface of the stator 13,
The oil hole 17 in the crankshaft 2 is connected to the discharge port of the engine-lubricating oil pump 19 driven by the engine, and the bottom of the charging generator 3 is passed through the passage 7 at the lower end of the crankcase 1 to the oil reservoir in the crankcase 1. It is characterized by being connected to.

FIG. 1 shows one embodiment, in which a crankcase 1 of an engine rotatably supports a crankshaft 2 (crankshaft) via a bearing (not shown).

3 is a charging generator, 4 is a generator cover, and generator cover 4
is fastened to the crankcase 1 with multiple bolts,
The internal space 5 (atmosphere) communicates with an oil reservoir in the crankcase 1 through a passage 7 provided at the lower end of a partition wall 6 integral with the crankcase 1.

8 is a rotor, the rotor boss 9 in the center is tapered fit into the tapered part 10 at the tip of the crankshaft 2, and the bolt 11
It is fastened to the crankshaft 2 by.

12 is a washer. A stator 13 is attached to a boss 14 at the center of the cover 4 so as to face the inside of the rotor 8 with a slight gap therebetween, and has a coil 15.

Reference numeral 17 denotes an oil hole provided at the end of the crankshaft 2, which is connected via an oil passage 18 for crankshaft lubrication to the discharge port of an oil pump 19 driven by the engine, and the suction port of the oil pump 19 is connected to the oil passage. 20 and is connected to a strainer 21 in the oil sump.

The oil passage 18 branches into an oil hole 17 for lubricating the crankshaft and the funnel rod.

The end of the oil hole 17 is a screw hole 22, into which the bolt 11 is screwed, and the oil hole 17 passes through an oil hole 23 in the bolt 11 into an annular space 24 surrounding the bolt 11. The space 24 communicates with a plurality of oil holes 25 provided in the boss 9 in a direction perpendicular to the crankshaft 2 .

The tip of the oil hole 25 opens approximately perpendicularly to the inner circumferential surface of the stator 13.

When the engine is started now, the oil pump 19 operates as the engine rotates, and the crankshaft lubricating oil discharged from the oil pump 19 is forced into the oil hole 17.

A part of the oil forced into the oil hole 17 passes through the oil holes 23 and 25 of the bolt 11 and the rotor boss 9, and is injected to the stator 13.

The temperature of the injected oil is usually in the range of 70°C to 140°C, but the temperature of the stator 13 and the coil 15 wound around the stator 13 is as high as 150°C to 180°C.
This temperature difference causes the stator 13 and the coil 15 to be forcibly cooled.

As explained above, according to the present invention, the following special effects can be obtained.

In other words, by using the bolt 11 for fixing the rotor boss 9 to the crankshaft 2 and adding an oil hole 23 to the bolt 11, the oil hole 17 in the crankshaft 2 can be connected to the space 24, and the oil passage can be connected. There is no need to perform extra machining on a large component such as the crankshaft 2 in order to form it, and it can be implemented at low cost.

Further, since the washer 12 of the bolt 11 serves both the function of tightening the rotor boss 9 and the function of closing the space 24, an oil passage leading to the nozzle oil hole 25 can be easily formed from this surface as well.

The oil holes 25, which serve as nozzles, open radially toward the inner circumferential surface of the stator 13, so that the oil flows through the entire inner circumferential surface of the stator 13 from the oil holes 25, which rotate together with the rotor boss 9, by both hydraulic pressure and centrifugal force. It collided with the surroundings with force, and the stator 13
Cool evenly from the inner circumferential side.

Moreover, all of the oil that cooled stator 13 was transferred to stator 1.
3 and the rotor 8, during which it is splashed by or flows over the coil 15 in the space;
The entire amount is guided to the cup-shaped a-tube 8 to cool the rotor 8, and then scatters radially from the open end of the rotor 8 (left end in Figure 1) into the generator cover 4, colliding with the inner surface of the cover 4. The liquid becomes mist-like and cools the coil 15 in the space between the stator 13 and the cover 4.

Therefore, the oil spouted from the nozzle oil hole 25 not only cools the stator 13 uniformly from the inner peripheral side, but also cools the stator 13 uniformly from the inner circumferential side.
The stator 13, the coil 15, the rotor 8, etc. are effectively used to uniformly cool the entire stator 13, coil 15, rotor 8, etc. while passing through the curved passage formed by the rotor 4, the rotor 8, and the cover 4.

Since the rotor 8 opens in the opposite direction to the crankcase 1 (left side in Figure 1), the distance from the open end of the rotor 8 to the passage 7 becomes long, and the particles are scattered from the open end of the rotor 8 and form a mist. After the oil is used to cool the coil 15 and the like, most of it returns to the liquid state through the passage 7 to the oil reservoir in the crankcase, thereby minimizing the amount of oil consumed.

In addition, in the present invention, a structure is adopted in which a part of the oil for lubricating the crankshaft is used as the oil for cooling the stator 13 and the coil 15, so that the oil pump 1
9 can also be used, and the oil hole 23 is provided in the bolt 11 without changing the shape of the oil hole in the crankshaft 2.
By simply adding an oil hole 25 that acts as a nozzle to the rotor boss 9, the present engine structure can be implemented without changing at all, and there is an advantage that it can be manufactured at low cost.

Also, since oil is ejected from the oil hole 17 in the center of the crankshaft through the oil hole 25 extending radially outward, the oil hole 1
In addition to the oil pressure in the oil pump 7, the centrifugal force can forcefully spray the oil onto the stator 13 without affecting the lubrication performance of other lubricating parts (bearings, etc.) around the crankshaft. The stator 13, coil 15, etc. can be effectively cooled without changing the capacity of the stator 13, coil 15, etc.

Figure 2 shows the temperature distribution of each part inside the generator, and the solid line shows the conventional standard product that does not use forced cooling with oil;
The broken line is the temperature curve of the oil-cooled type according to the present invention, and the data is based on a bench test at 3000 rpm.

As is clear from FIG. 2, in the case of the oil-cooled type, the temperature of each part is significantly lowered.

Note that when embodying the present invention, there may be no problem even if there is only one oil hole 25.

Even if an appropriate restriction is provided to reduce the amount of oil discharged from the oil hole 25 and the oil pressure in the oil hole 25 portion is lowered, the oil in the oil hole 25 can be splashed onto the stator 13 only by centrifugal force.
In the present invention, such cases are also expressed as injection.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the device according to the present invention, and FIG. 2 is a graph showing the temperature distribution in each part. 1...Crank case, 2...Crankshaft (crankshaft), 4---Cover 8
a*e++*a rotor, 13...stator,
15... Coil, 25... Oil hole.

Claims (1)

[Scope of utility model registration request] A generator cover 4 is fixed to the crankcase 1, a cup-shaped generator rotor 8 is fixed to the end of the crankshaft 2 and opens in the opposite direction to the crankcase 1, and the inner surface of the cover 4 opens toward the crankcase 1. A stator 13 with a coil is fixed to a boss 14 facing inside the power generation rotor 8, and a screw hole 22 communicating with an oil hole 17 in the crankshaft 2 is provided at the end of the crankshaft in the charging generator 3. Provide this screw hole 22
The rotor boss 9 is fitted and tightened to the tapered portion 10 on the outer periphery of the crankshaft end by screwing the bolt 11 with the washer 12 to the space 24 between the end face of the crankshaft 2, the inner surface of the rotor boss 9, and the bolt 11. with washer 12, and bolt 11
An oil hole 23 connecting the screw hole 22 and the space 24 is provided inside the rotor boss 9, and an oil hole 25 is provided in the rotor radial direction facing the inner surface of the stator 13 consisting of the space 24. Charging for an engine characterized by communicating with a discharge port of a driven engine lubricating oil pump 19, and communicating the bottom of the charging generator 3 with an oil reservoir in the crankcase 1 through a passage 7 at the lower end of the crankcase 1. Generator cooling system.