Traction distributing devices for motor vehicles

Details Traction distributing devices for motor vehicles Traction distributing devices for motor vehicles

2000-02-18

2003-02-18

Parekh, Ankur (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Control of differential planetary gearing

C180S076000

Reexamination Certificate

active

06520880

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to traction distributing devices for motor vehicles, which enable active control of the rate of distribution of traction with regard to right- and left-wheel shafts.
One of the known traction distribution devices is shown in the bulletin “Direct Yaw Control System” published by HONDA MOTOR, CO., LTD. on May 29, 1996.
FIG. 4
shows a drive system including such a traction distribution device. A transmission
100
includes a differential-gear mechanism
101
which serves to equally distribute traction to shafts
103
,
102
of right and left wheels
106
,
105
. A unit
104
is mounted to the left-wheel shaft
102
to ensure active control of the rate of distribution of traction with regard to the wheel shafts
103
,
102
. Disposed coaxially in the unit
104
are a right sun gear
107
mounted to the right-wheel shaft
103
, a central sun gear
108
mounted to the left-wheel shaft
102
, a left sun gear
110
mounted to a sun-gear shaft
109
, and a carrier
114
for rotatably supporting pinions
111
,
112
,
113
integrated therewith. The pinions
111
,
112
,
113
are engaged with the sun gears
107
,
108
,
110
, respectively, to be capable of revolving on their axis and therearound. A right-cornering clutch
117
is interposed between the carrier
114
and a casing
115
of the unit
104
, whereas a left-cornering clutch
116
is interposed between the sun-gear shaft
109
and the casing
115
.
When the vehicle comers right, the right-cornering clutch
117
fixes the carrier
114
so that a transmission system including the sun gear
107
, the pinions
111
,
112
, and the sun gear
108
increases the rotating speed of the left-wheel shaft
102
with respect to that of the right-wheel shaft
103
. It is understood that active control of the rate of distribution of traction with regard to the right- and left-wheel shafts
103
,
102
contributes to an improvement in the cornering performance, etc. of the vehicle.
With the known traction distribution device, however, active control of the rate of distribution of traction with regard to the right- and left-wheel shafts
103
,
102
is ensured by switching of complicated gear trains, resulting in inevitable increase in size, weight, and manufacturing cost of the device.
It is, therefore, an object of the present invention to provide traction distribution devices for motor vehicles which contribute to a reduction in size, weight, and manufacturing cost.
SUMMARY OF THE INVENTION
One aspect of the present invention lies in providing a traction distribution device for a motor vehicle with a differential-gear mechanism for transmitting torque of a differential casing to wheel shafts, the device comprising:
a source of a hydraulic pressure, the source including a hydraulic pump which produces the hydraulic pressure by torque of the differential casing;
a hydraulic motor arranged in the differential-gear mechanism, the motor providing relative torque between one of the wheel shafts and the differential casing in accordance with a direction of the hydraulic pressure supplied thereto;
means for controlling the hydraulic pressure supplied to the motor; and
means for switching the direction of the hydraulic pressure supplied to the motor.
Another aspect of the present invention lies in providing a traction distribution device for a motor vehicle with a differential-gear mechanism for transmitting torque of a differential casing to wheel shafts, the device comprising:
a hydraulic pump arranged to produce a hydraulic pressure by torque of the differential casing;
a hydraulic motor arranged in the differential-gear mechanism, the motor providing relative torque between one of the wheel shafts and the differential casing in accordance with a direction of the hydraulic pressure supplied thereto;
a first valve interposed between the source and the motor, the first valve controlling the hydraulic pressure supplied to the motor; and
a second valve interposed between the source and the motor, the second valve switching the direction of the hydraulic pressure supplied to the motor.


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Honda Motor, Co., Ltd., “Direct Yaw Control System”, May 29, 1996.

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