Automatic electrohydraulically controlled transmission

Details Automatic electrohydraulically controlled transmission Automatic electrohydraulically controlled transmission

1998-06-22

2001-03-27

Marmor, Charles A (Department: 3681)

Machine element or mechanism

Elements

Gear casings

C074S335000

Reexamination Certificate

active

06205887

ABSTRACT:

FIELD OF INVENTION
The invention relates to an automatic transmission with electrohydraulic control, in particular for motor vehicles.
BACKGROUND OF THE INVENTION
In automatic transmissions of this type, especially those of motor vehicles, the hydraulic control unit and various sensors for pressure readings and engine speeds are integrated into the transmission and are connected to externally located control equipment by way of appropriate lines. This entails higher installation and parts costs and some malfunction sensitivity due to potential line interruptions.
SUMMARY OF INVENTION
The object of the invention is to provide for a generic transmission an arrangement of the hydraulic and electronic control units which permits simple and convenient assembly accompanied by use of fewer parts.
The present invention discloses that the hydraulic and electronic control units be mounted adjacent to each other on a flange on an end of the transmission. The hydraulic and electronic control units may accordingly be premounted as a modular unit and then preferably placed in position and fastened without bracing by means of several bolts.
It is expedient for the hydraulic connections leading from the hydraulic control unit into the transmission to be moved to the flange area on the end and to be connected by means of sealing connections.
As a result of mounting on the end, the connecting sleeves fastened to the hydraulic control unit may project directly into channels provided in the drive or driven shaft; that is to say, hydraulic fluid distributed over the shafts may be delivered by the hydraulic control unit directly, with no additional delivery through a line or channel.
In addition, supply lines mounted in the transmission housing by way of sealing sleeves may be connected to corresponding connecting surfaces of the hydraulic control unit. The sealing sleeves compensate for longitudinal extensions and longitudinal tolerances of the supply lines without the danger of leaks, because of their structure disclosed herein specification.


REFERENCES:
patent: 5403245 (1995-04-01), Watanabe et al.
patent: 5709134 (1998-01-01), Ulm
patent: 5749060 (1998-05-01), Graf et al.
patent: 5754969 (1998-05-01), Ando et al.
patent: 5845544 (1998-12-01), Huggins et al.
patent: 5845545 (1998-12-01), Braun et al.
patent: 5941137 (1999-08-01), Beer et al.

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