Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1987-01-21
1989-05-30
Wright, Dirk
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74695, 74714, 74740, F16H 3708, F16H 142
Patent
active
048339431
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a transmission for a motor vehicle.
BACKGROUND OF THE INVENTION
For the attainment of the maximum possible available space in small passenger motor vehicles, the drive motors are arrayed transversely to the direction of motion, and provided in connection with a front wheel drive. This configuration just barely manages to accommodate the drive motor and a multi-speed automatic transmission flanged thereonto, with three or at most four speeds, depending on the torque to be transmitted. Unfortunately, the space transverse to the direction of motion under this configuration is taken up to such an extent that at full steering excursion, and with snow chains installed, the chains already impinge on the transmission so that a further increase of the number of speeds does not appear to be possible.
Such transmission is known from company publication F1/36 WH 816009 (page 3) and also as represented in bulletin sheets F43/301/RT 3356-683 and F 43/437 RT 3397-683. A similar disclosure is found in DE-OS No. 29 19 167 and DE-OS No. 29 19 405.
For small passenger motor vehicles it is highly important to lower the fuel consumption by better adaptation of the drive train to the more fuel efficient portion of the drive motor performance curve.
It is therefore an objective of the invention to further develop a transmission for a motor vehicle by increasing the number of speeds with the goal of adapting the drive train better to the drive motor, without having to enlarge the available installation space. Achievement of this objective will mean cost savings in development and manufacture.
SUMMARY OF THE INVENTION
A transmission for a motor vehicle with a drive motor is disclosed wherein a first axis traverses a length of the motor, which length is arranged transversely to the direction of the vehicle motion, and comprises: transmission and the motor; actuated by the countershaft; transversely connected to the countershaft; and deliver at least one more speed, the partial transmission being placed coaxially along the third axis and connected to the axle drive.
If an automatic transmission as generally known, and arranged in known manner, is extended by a partial transmission which is arranged coaxially to the axle drive and is connected therewith, then at least one additional speed can be gained with relatively simple means because no changes need to be made to the already existing transmission. A small installation space parallel to the drive motor is already normally available and may be utilized by the partial transmission. Use of this space will allow retention of the known arrangement of drive motor and speed change transmission and even of the axle drive. Only the axle drive has to be adapted to the new partial transmission, which requires relatively little effort, considering the success achieved.
Where the partial transmission is applied as a simple planet gear set with the clutches and brakes necessary for shifting, and with a free wheel unit, and the axle drive is implemented as a planet gear differential, the combination of these two drives is possible in a particularly simple manner. The transmission housing can be adapted appropriately on one hand by an entirely new housing, or, on the other hand, by means of extending the housing which in principle already exists with a housing for the axle drive and the partial transmission. The particular option chosen will depend on the quantity of transmissions to be fabricated.
By means of simple connections but driven differentially, between the axle drive and the partial transmission, a five-speed transmission with one or two overdrives can be achieved in connection with a four-speed transmission in the hitherto known arrangement. Thereby the usual countershaft arrangement of the known four-speed transmission can be eliminated, which is of particular advantage.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details of the invention are explained hereinafter through the description and drawings of various embodiments. The
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F43/301/RT 3356-683, ZF-Automatgetriebe 3 HP 22.
F43/437 RT 3397-683, ZF-Automatgetriebe, 4HP 14 4HP 18.
F1/36 WH 816009, (page 3).
Dubno Herbert
Macris Harold E.
Wright Dirk
Zahnradfabrik Friedrichshafen AG
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