Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-10-02
1998-06-30
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 76, 310 78, 310 96, 310 98, 310100, 192 841, 180 652, 477 7, 477 13, B60K 904
Patent
active
057739048
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric machine having at least one integrated clutch.
2. Description of the Prior Art
As part of the effort directed at reducing the specific fuel consumption of motor vehicles, a vehicle with a hybrid drive has become known which has an internal combustion engine and a traditional mechanical drive train with transmission, as shown diagrammatically in FIG. 1. Between the internal combustion engine 6 and the transmission 7 there is an electric machine which is developed as an asynchronous machine and can optionally operate as an electric motor (for the driving of the vehicle or for starting the internal combustion engine 6) or as an electric generator. Outside of and positioned axially on opposite sides of the inner rotor 1 of the electric machine, there are two switchable clutches 3, 4 for transmitting torque to the rotor. The stator 2 of this electric machine lies radially on the outside of the rotor 1 and can be connected by wires to an electric battery 5 for transmitting drive energy to the rotor 1.
The rotor 1 has a two-fold function since it also operates as a flywheel for the internal combustion engine 6. For this purpose, in corresponding operating phases, the clutch 3 of the electric machine which faces the internal combustion engine 6 is engaged so that the crankshaft 8a of the internal combustion engine 6 is connected for rotation with the rotor 1. In order to transmit mechanical drive energy via the crankshaft 8b to the transmission 7, the clutch 4 is also engaged for rotation with the rotor 1. In operating phases during which a purely electric drive is supplied with a charging of current from the battery 5, the clutch 3 facing the internal combustion engine 6 is opened and only the other clutch 4 is engaged with the rotor 1. This state of engagement of the clutches 3, 4 can also exist during phases in which the vehicle is braked, the electric machine being operated as a generator for charging the battery 5. In order to increase the braking effect, the first clutch 3 can also be engaged with the rotor 1 so that the internal combustion engine 6 also acts as a brake.
By the direct flanging of the clutches 3, 4 on the sides of the rotor 1, a relatively compact construction is obtained. One disadvantage of this known solution resides, in particular, in the fact that the power and the maximum torque of the electric machine are considerably less than the corresponding values of the internal combustion engine 6. This hybrid drive therefore permits only very modest driving performance in phases of purely electric operation. Fan cooling is provided for removal of the loss power which is converted into heat.
SUMMARY OF THE INVENTION
The object of the present invention is to improve an electric machine of this type providing an even more compact construction in the axial direction, a substantially higher torque and a higher power density and, at the same time, assuring high operation dependability.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be explained in further detail below with reference to the drawing, in which:
FIG. 1 shows a drive diagram for a known hybrid drive;
FIG. 2 shows a drive diagram for a hybrid drive having an electric machine in accordance with the invention;
FIG. 3 shows a modified embodiment of the electric machine of FIG. 2; and
FIG. 4 shows a detail of a rotor of the electric machine of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The manner of operation of the known hybrid drive of FIG. 1 has already been discussed in detail. The drive shown in FIG. 2 operates, basically, in substantially the same manner, so that, in essence only the differences will be taken up in further detail below. Parts having the same function have been provided in FIGS. 2 to 4 with the same reference numerals as in FIG. 1.
Differing from FIG. 1, the electric machine of FIG. 2 which can be operated optionally as an electric motor or as an electric generator, is developed
REFERENCES:
patent: 2624856 (1953-01-01), Younger
patent: 4363984 (1982-12-01), Torii et al.
patent: 4405031 (1983-09-01), Rotter
patent: 4499965 (1985-02-01), Oetting et al.
patent: 4533011 (1985-08-01), Heidemeyer et al.
patent: 5209332 (1993-05-01), Okayasu
patent: 5337848 (1994-08-01), Bader et al.
Schiebold Stefan
Thieler Wolfgang
Dougherty Thomas M.
Mannesmann Aktiengesellschaft
Tamai Karl I. E.
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