Power train of automatic transmission

Details Power train of automatic transmission Power train of automatic transmission

1999-12-29

2001-10-30

Estremsky, Sherry (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

C475S281000, C475S283000

Reexamination Certificate

active

06309322

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power train of automatic transmission, and more particularly to a power train of automatic transmission adapted to arrange an under drive clutch, a reverse clutch and a kickdown brake behind a planetary gear set and to provide an over drive clutch and a transfer driver gear in front of the planetary gear set.
2. Description of the Prior Art
FIG. 6
is a schematic diagram for illustrating a power train according to the prior art. The power train of automatic transmission is arranged in front of a planetary gear set
2
with a front clutch
8
connected to a reverse sun gear
6
by a first power transmission member
4
, a rear clutch
14
connected to a forward sun gear
12
by a second power transmission member
10
, a kickdown band brake
16
controlling a rotary power of the first power transmission member
4
and a low reverse brake
24
connected to a transmission housing
22
for controlling a one-way clutch
20
connected to a long pinion
17
and a third power transmission member
18
and is provided at a rear end thereof with a transfer drive gear
30
meshed with a transfer driven gear
28
by being connected to an annulus gear
26
and an end clutch
34
connected to a planetary carrier
32
.
The transfer driven gear
28
is connected by a transfer shaft
36
and a deep drive gear
38
.
FIG. 7
is a schematic diagram for illustrating a final reduction gear unit applied to a power train of automatic transmission according to the prior art.
In the final reduction gear unit
44
, an input from an input shaft
40
is transmitted to a transfer drive gear
30
via planetary gear set
2
, and the power transmitted thereby is transmitted to wheels via the transfer driven gear
28
meshed with the transfer shaft
36
and the deep drive gear
38
.
The transfer drive gear
30
is connected to an annulus gear
26
of the planetary gear set
2
via a clocking nut
46
to be mounted at an output flange
48
.
The transfer drive gear
30
is rotably supported by double angular bearing
54
fixed by a bolt
52
to the transmission housing
22
. The transfer driven gear
28
meshed with the transfer drive gear
30
is also secured to the transfer shaft
36
by a locking nut
56
.
FIG. 8
is a schematic diagram for illustrating an end clutch unit according to the prior art, where the end clutch unit
34
is arranged at an end clutch shaft
58
of input shaft
40
with an end clutch hub
60
, at the input shaft
40
with an end clutch retainer
62
, and there between with a clutch reaction plate
64
, clutch plate
66
and a clutch disc
68
, and includes an end clutch piston
70
disposed in front of the end clutch retainer
62
and an end clutch return spring
72
supporting the end clutch piston
70
.
The end clutch unit
34
is clutched when oil pressure is applied through an oil orifice
74
provided at the end clutch retainer
62
while the end clutch piston
70
copes with the resilience of the end clutch return spring
72
to press the clutch plate
66
and clutch disc
68
.
Conversely, when oil pressure applied to the end clutch unit
34
is released, the end clutch piston
70
is retracted by the end clutch return spring
72
to separate the clutch plate
66
and the clutch disc
68
, thereby blocking the power transmission.
FIG. 9
is a schematic diagram for illustrating front and rear clutch intermittent controller of automatic transmission according to the prior art, where the front and rear clutch intermittent controller
80
includes at front side of the planetary gear set
2
a kickdown band brake
16
, front clutch
8
and a rear clutch
14
.
The kickdown band brake
16
is arranged at a peripheral surface of kickdown drum
82
. The rear clutch
14
includes a clutch reaction plate
88
and a clutch disc
90
and a clutch plate
92
between rear clutch retainer
84
disposed at the input shaft
40
and rear clutch hub
86
connected to the forward sun gear
12
.
Furthermore, the rear clutch
14
is also provided with a rear clutch piston
98
which copes with resilience of the rear clutch return spring
96
supported by rear clutch return spring retainer
94
, advances by way of pressure of supplied oil and presses the clutch disc
90
and clutch plate
92
to interrupt the power.
Front clutch
8
includes a front clutch reaction plate
104
disposed between front clutch hub
100
formed at rear clutch retainer
84
and front clutch retainer
84
, a clutch disc
106
, a clutch plate
108
and a front clutch piston
112
for coping with the resilient of front clutch return spring
110
to advance by way of oil pressure.
Now, operation of rear clutch at the front and rear clutch intermittent controller
80
thus described will be described.
When pressure is applied through an oil orifice
114
formed at the rear clutch retainer
84
, the rear clutch piston
98
copes with the resilience and advances to press the clutch disc
90
and the clutch plate
92
for integration and power transfer.
Furthermore, when the oil pressure is applied to the front clutch
8
, the clutch disc
106
and the clutch plate
108
are integrated by the front clutch piston
112
to transfer the power to the front clutch retainer
102
.
The power transferred is transmitted to the reverse sun gear
6
via the kickdown drum
82
and to transfer drive gear via the long pinion
17
, annulus gear
26
and the like by way of planet carrier
118
fixed by low reverse brake
116
as repulsive element.
Now, transmission action of the power train at the automatic transmission will be described.
<First speed>
The rear clutch
14
as input element and one-way clutch
20
as repulsive element operate to form a first speed of drive “D” range.
The power input to the input shaft
40
is transmitted to the forward sun gear
12
via the rear clutch
14
and again transmitted to transfer drive gear
30
through short pinion
42
, long pinion
17
and the annulus gear
26
with the planetary carrier
32
secured to the one-way clutch
20
as repulsive faction.
<Second speed>
the rear clutch
14
as input element and kickdown band brake
16
as repulsive element are operated to form a second speed of drive “D” range. The power input to the input shaft
40
is transmitted to the forward sun gear
12
via the rear clutch
14
and is again transmitted to the transfer drive gear
30
through the short pinion
42
, long pinion
17
and annulus gear
26
with the reverse gear
6
secured by the kickdown band brake
16
as repulsive factor.
<Third speed>
The rear clutch
14
as input element and front clutch
8
as repulsive element are operated to cause the planetary gear set
2
to integrally rotate and to perform a third speed of drive “D” range.
The power input to the input shaft
40
is transmitted simultaneously to the rear clutch
14
and the front clutch
8
and the power transmitted to the rear clutch
14
is transmitted to the forward sun gear
12
and the power transmitted to the front clutch
8
is transferred to the reverse sun gear
6
. At this time, the planetary gear set
2
is locked to be integrally rotated while the power therefrom is transmitted to transfer drive gear
30
.
<Fourth speed>
The end clutch
34
as input element and kickdown band brake
16
as repulsive element are operated to form a fourth speed of drive “D” range. The power input to the input shaft
40
is transmitted to the planetary carrier
32
through end clutch
34
and is again transmitted to the transfer drive gear
30
via long pinion
17
, annulus gear
26
with the reverse sun gear
6
secured by the kickdown band brake
16
as repulsive factor.
<Reverse>
The front clutch
8
as input element and planetary carrier
32
secured by the lower reverse brake
24
as repulsive element are operated to cause the power to be transmitted to the transfer drive gear
30
via the long pinion
27
and the annulus gear
26
.
SUMMARY OF THE INVENTION
However, there is a problem in the prior art thus described in that the transfer

Affiliated with

Also associated with

Rating

Power train of automatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power train of automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power train of automatic transmission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2573610