192 clutches and power-stop control – Transmission and brake – Motor vehicle
Reexamination Certificate
2000-10-19
2002-11-12
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Transmission and brake
Motor vehicle
C192S11000B, C192S11000B
Reexamination Certificate
active
06478132
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an output shaft through which driving force outputted from a vehicular automatic transmission is transmitted to driving wheels.
Generally, a conventional output shaft of an automatic transmission is configured as shown on page I-
7
in a publication “Maintenance Manual of Nissan Full-Range Electronic Control Automatic Transmissions” published on March 1987.
FIG. 13
shows a schematic structure of this conventional automatic transmission including a conventional output shaft
108
. The automatic transmission comprises a converter case
101
, a transmission case
102
and a rear extension
103
. An input shaft
107
transmits a driving force of an engine from a torque converter
104
in the converter case
101
to a gear train
105
in the transmission case
102
. The driving force is varied in rotation speed by the gear train
105
and is transmitted to driving wheels through the output shaft
108
and a flange companion. The output shaft
108
has oil passages for lubricating sliding portions of the automatic transmission. A parking gear
109
for fixing driving wheels during a parking condition is fixedly connected to the output shaft
108
in the rear extension
103
.
SUMMARY OF THE INVENTION
However, since this conventional output shaft
108
has been configured to one piece structure extending from the gear train
105
to the flange companion
110
, it is necessary to change the output shaft
108
when an axial dimension of an automatic transmission is changed according to the change of vehicle variety. Further, when this output shaft structure is employed to an automatic transmission for four wheel drive (4WD) vehicle, it is necessary to install a 4WD unit at a part corresponding to the rear extension
103
. However, this 4WD arrangement requires to completely replace the output shaft
108
with a different output shaft for 4WD. Furthermore, this conventional one-piece structure of the output shaft
108
increases difficulties in machining oil passages according to the elongation of the axial dimension of the output shaft
108
. Additionally, since the output shaft
108
is directly connected to the flange companion
110
, there is a tendency that the gear train
105
receives the load input including bending force and thrust force from driving wheels.
It is therefore an object of the present invention to provide an improved output shaft structure which solves the above-mentioned problems.
An output shaft of an automatic transmission according to the present invention comprises a first output shaft which outputs a driving force from a gear train of an automatic transmission and a second output shaft which is connected to the first output shaft so as to be movable in an axial direction and to be fixed in a rotational direction with respect to the first output shaft. The second output shaft is integral with a parking gear which fixes the second output shaft in rotation when the automatic transmission is set at a parking position.
REFERENCES:
patent: 3631947 (1972-01-01), Laing
patent: 3814222 (1974-06-01), Koivunen
patent: 4907681 (1990-03-01), Kuusik
patent: 6065581 (2000-05-01), Nogle
Maintenance Manual of Nissan Full-Range Electronic Control Automatic Transmission, pp. 3 sheets, (Mar. 1987).
Jatco Transtechnology Ltd.
Rodriguez Saul
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