JPH022095Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drive device for a vehicle generator.

Conventionally, as this type of device, a fluid coupling is interposed between the rotor shaft of a generator and a driving body driven by an engine, and the fluid coupling is connected to a pump member connected to the driving body and to the rotor shaft. A turbine member composed of a pump member and a viscous fluid interposed between the pump member and the turbine member is known.
In the low-speed rotation range of the engine, viscous fluid is not evenly distributed in the gap between the pump member and the turbine member, causing slippage between the two parts, resulting in a problem in which the output does not increase because the generator rotor rotation speed is low. There is.

In addition, when viscous fluid generates heat, its viscosity decreases and the transmission torque of the fluid coupling rapidly decreases, so even if the engine speed is sufficiently high, the generator rotor speed rapidly decreases, causing power generation failure. There are also problems such as concerns.

In view of the above, the present invention includes an electromagnetic clutch that is excited when the rotor rotation speed of the generator is lower than a predetermined value and connects the pump member and the turbine member, thereby solving the conventional problem. The purpose is to provide equipment.

In order to achieve the above object, the present invention includes a fluid coupling interposed between a rotor shaft of a generator and a driving body driven by an engine, and the fluid coupling is a pump member connected to the driving body. and a turbine member connected to the rotor shaft, and a viscous fluid interposed between the pump member and the turbine member, in which the pump member and the turbine member can be directly connected. The present invention is characterized in that it comprises an electromagnetic clutch and a control device connected to the electromagnetic clutch to directly operate the electromagnetic clutch when the rotor rotational speed of the generator is lower than a predetermined value.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an alternating current generator as a generator, and its stator 2 is held between a pair of left and right bearing brackets 3 and 4, and its rotor 5 is held. A rotor shaft 6 is supported by bearing brackets 3 and 4 via bearings 7.

A pulley 8 serving as a driving body is rotatably attached to the rotor shaft 6 that projects outward from the bearing bracket 4 via a bearing 9, and the pulley 8 is driven by an engine (not shown) via a V-belt (not shown). Ru.

A pump member P is provided between the rotor shaft 6 and the pulley 8.
and a fluid coupling Fc consisting of a turbine member T. The pump member P includes a casing 10 integrally formed with the pulley 8 and a lid 11 that closes an opening of the casing 10, and a certain amount of viscous fluid L is sealed within the pump member P. The turbine member T includes a disk 13 having a boss portion 12 at the center.
The disk 13 is disposed within the pump member P with a certain gap around it, and the boss portion 1
2 is coupled to the rotor shaft 6 via a key 14.
A boss portion 15 integrally formed on the lid body 11 of the pump member P is rotatably supported on the outer periphery of the boss portion 12 of the turbine member T via a bearing 16.

An annular iron core 17 located on the outer periphery of the lid 11 is fixed to the outer surface of the bearing bracket 4 facing the lid 11 of the pump member P.
A coil 19 is installed in an annular groove 18 formed in the end face facing the .

In the turbine member T, the large-diameter end of a dish-shaped spring member 20 is fixed to the surface of the disc 13 facing the lid 11, and the spring member 20 is attached to the lid 11 in its free state. A magnetic body 21 to be brought close is fixedly provided on the outer surface. As a result, the magnetic body 21 faces the iron core 17 via the lid 11, and when the coil 19 is energized and the iron core 17 is magnetized, the magnetic body 21 is attracted to the inner surface of the lid 11 while bending the spring member 20. When the coil 19 is brought into close contact with the coil 19, the iron core 17 is demagnetized and the magnetic body 21 is separated from the inner surface of the lid 11 due to the restoring force of the spring member 20.

Therefore, the iron core 17, the coil 19, the spring member 2
0 and the magnetic body 21 constitute an electromagnetic clutch Mc that connects and connects the pump member P and the turbine member T. A control device C that is energized is connected.

In the figure, 22 is a cooling fan attached to the rotor shaft 5, and 23 is a cooling air introduction hole formed in the bearing bracket 4.

Next, to explain the operation of this embodiment, since the rotor 5 of the generator 1 is not rotating before the engine starts, the coil 1 of the electromagnetic clutch Mc
9 is energized by the control device C, thereby the magnetic body 21 is attracted to the iron core 17 and comes into close contact with the inner surface of the lid 11, and the pump member P and the turbine member T are connected by the frictional force between the lid 11 and the magnetic body 21. be done.

When the engine is started and the pulley 8 is driven, the pump member P and the turbine member T rotate together with it, and the rotational speed of the rotor 5 quickly increases in proportion to that of the engine, as shown in Fig. 2a. do.

When the rotational speed of the rotor 5 reaches a predetermined value b, it is detected by the control device C and the coil 1
Since the power to 9 is cut off, the electromagnetic clutch Mc
is shut off, and from then on, the rotational force is transmitted to the turbine member T from the pump member P due to the shear resistance of the viscous fluid L existing in the gap on both sides of the disk 13 of the turbine member T, and the rotor rotation speed is shown in FIG. 2c. It becomes almost constant.

FIG. 2d shows the rotor rotational speed characteristics of a conventional generator, and it can be seen that the rotor rotational speed rises slowly after the engine is started due to slippage between the pump member and the turbine member.

On the other hand, when the viscosity of the viscous fluid L decreases due to heat generation and the rotational speed of the rotor 5 falls below a predetermined value b, the control device C detects this and operates the electromagnetic clutch Mc, causing the pump member P and the turbine Since the member T is connected, the rotational speed of the rotor 5 increases, and problems such as poor power generation do not occur.

As described above, according to the present invention, a fluid coupling is interposed between a rotor shaft of a generator and a driving body driven by an engine, and the fluid coupling has a pump member connected to the driving body, An electromagnetic clutch capable of directly connecting the pump member and the turbine member in a vehicle generator drive device comprising a turbine member connected to the rotor shaft and a viscous fluid interposed between the pump member and the turbine member. and a control device that is connected to the electromagnetic clutch and directly operates the electromagnetic clutch when the rotor rotation speed of the generator is lower than a predetermined value, so that the electromagnetic clutch is directly operated in the low speed rotation region of the engine. Therefore, the rotor rotation speed of the generator can be quickly increased in accordance with the increase in the engine rotation speed, and thereby the generator can secure a sufficient amount of power generation even when the engine is in a low speed rotation state.

In addition, especially when the viscosity of the viscous fluid decreases due to heat generation, conventionally there is a risk of power generation failure due to a decrease in the rotor rotation speed of the generator even when the engine is in the high speed region, but in the present invention, Even in such a case, the electromagnetic clutch can be operated directly to prevent a decrease in the rotor rotational speed of the generator, so there is no need to worry about the power generation failure, and a sufficient amount of power generation can always be ensured.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of a main part of an embodiment of the present invention, and FIG. 2 is a graph showing the rotation speed characteristics of a rotor in a generator. C... Control device, Fc... Fluid coupling, L... Viscous fluid, Mc... Electromagnetic clutch, P... Pump member, T... Turbine member, 1... Generator, 6...
Rotor shaft, 8...Pulley as a driving body.

Claims (1)

[Scope of utility model registration request] A fluid coupling Fc is interposed between the rotor shaft 6 of the generator 1 and the driving body 8 driven by the engine,
This fluid coupling Fc is composed of a pump member P connected to the driving body 8, a turbine member T connected to the rotor shaft 6, and a viscous fluid L interposed between the pump member P and the turbine member T. In the drive device for a vehicle generator, there is provided an electromagnetic clutch Mc that can directly connect the pump member P and the turbine member T; A control device C for directly operating the electromagnetic clutch Mc when the power is low.