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all gear trains pdf
Post: #1

i am amit patel, student of final year mechanical engineering. i have a project on epycyclic gear train. i want complete information about gear train project.
my e-mail id = amit8689[at]gmail.com
Post: #2
GEAR TRAIN


.pdf  GEAR.pdf (Size: 1.02 MB / Downloads: 79)

N RANGE

Since the rear sun gear and the high clutch drum are in mesh with the input shaft, they rotate together
with the input shaft.
The high clutch drum does not transmit the torque to the planetary unit since the reverse clutch and
the high clutch are not engaged.
The torque of the rear sun gear is transmitted to the rear internal gear through the pinion gear.
However, the torque of the rear sun gear is not transmitted to the rear planetary carrier since the
low clutch is disengaged and, therefore, the rear internal gear is freewheeling.
As a result, the torque of the input shaft is not transmitted to the reduction drive shaft*.

1ST SPEED GEAR OF D OR 3 RANGE (D1, 31)

When the 1st gear is selected in the D or 3 range, only the low clutch is engaged. In this state, the
rear internal gear attempts to rotate counterclockwise but it is impossible by the action of the oneway
clutch which locks the internal gear to the transmission case. As a result, rotation of the rear
sun gear causes the pinion gears to rotate around the sun gear. This causes the planetary carrier
to rotate. In this way, rotation of the input shaft is transmitted to the reduction drive shaft* after being
subjected to speed reduction by the planetary gear train.
On the other hand, the rear internal gear rotates clockwise if the reverse driving force is applied to
it by the reduction drive shaft* during coasting. This clockwise rotation of the internal gear causes
the one-way clutch to freewheel.

2ND SPEED GEAR IN D, 3, 2 RANGE (D2, 32, 22)

When the 2nd gear is selected in D, 3, or 2 range, the 2-4 brake and the low clutch are engaged.
The front sun gear is now locked to the transmission case due to engagement of the 2-4 brake. In
this state, the torque of the rear sun gear is transmitted to the rear internal gear through the path of
the front internal gear, front pinion gears, low clutch drum and low clutch. At this time, the one-way
clutch is freewheeling since the low clutch drum is rotating clockwise.
In this power flow configuration, the rear pinion gears are rotated by the rear internal gear at a speed
faster than that available from the configuration for the 1st gear, so the rotation speed of the reduction
drive shaft* is higher than that of the 1st gear.
Since the drive power is transmitted without passing through the one-way clutch in the 2nd gear, the
backward driving force from the wheels is transmitted through the reduction drive shaft* to the input
shaft; this makes the engine braking effect available.

3RD SPEED GEAR IN D OR 3 RANGE (D3, 33)

When the 3rd gear is selected in the D or 3 range, the low clutch and the high clutch are engaged.
The engaged high clutch rotates through its drum the front planetary carrier, and rotation of the carrier
is transmitted to the rear internal gear through the engaged low clutch. In this power flow configuration,
the rear sun gear and the rear internal gear rotate at the same speed since the rear pinion
gears are solid on their axes and the whole planetary gear train rotates as a unit at the same speed
as its sun gear. As a result, the input shaft and the reduction drive shaft* rotate at the same speed.
In the 3rd gear, the one-way clutch is freewheeling because the low clutch is rotating clockwise.
Since the drive power is transmitted without passing through the one-way clutch, the backward driving
force from the wheels is transmitted through the reduction drive shaft* to the input shaft; this
makes the engine braking effect available.
 

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