Fluid Velocity-Type Governor

TM 9-2520-249-34&P

which engage the low-range spur gear (44). Piston (45)

within intermediate range planetary carrier (32). Thus,

travels in a bore, machined into the front surface of

torque is transmitted from the converter output shaft,

bevel gear housing (9, FO-5).

through the high-range clutch pack to the high range

b. Operation (FO-4)

clutch hub. The result is a drive ratio of 1 to 1 from the

converter output shaft to the drive bevel gear.

(1) In both the intermediate- and low-

range clutch, hydraulic pressure pushes either piston (22

or 45) against the clutch disks, compressing them

2-6.

Fluid Velocity-Type Governor

against the stationary spacer assembly. When the disks

a. Description. The governor consist mainly

are compressed, friction prevents movement, and either

of two parts-a sheet metal annular ring, welded to the

ring gear (29 or 44) is held stationary (2) When hydraulic

front of high-range clutch housing (2, FO-4) and a pilot

pressure is released, the springs push piston (22 or 45,

tube assembly (47, FO-3) which is mounted stationarily

FO-4) back into its bore. This relieves the pressure on

to the rear side of the dividing wall in torque converter

the clutch disks and permits the internal-splined clutch

housing (60). The annular ring has a series of small

disks to rotate freely with ring gear (29 or 44).

vanes spaced around its inner circumference. The pitot

tube assembly contains one oil passage. One end of

2-8.

Intermediate-Range Planetary Gearing

this passage, the intake port, extends into the annular

a. Description (FO-4)

vaned ring and faces against the direction of rotation.

The other end, exit port, connects to a passage in the

(1) Planetary gearing for intermediate

converter housing.

range includes three main elements--sun gear, ring

b. Operation. The annular ring is kept filled

gear, and carrier assembly. An 8-pitch, 26-tooth spur

cluster sun gear (19, FO-4), (integral with the low range

with oil supplied from a port in the converter housing

sun gear) is splined to the converter output shaft and is

The oil is retained in the collector ring by centrifugal

the driving element. A 70-tooth (internal teeth) ring gear

force induced by rotation of the high-range clutch

(29), with external splines, is the reaction element.

housing. The series of vanes cause the oil to move at

Planetary carrier (32) contains four, 22-tooth pinions

virtually the same speed as that of the collector ring.

(31.3) mounted on four spindles (31.8) which rotate on

Thus, oil is thrown into the intake port of the pitot tube.

bearing rollers (31.6). The carrier is the driven element

The resulting pressure produced on the pitot tube varies

(2) Spacers (31.2 and 31.4, FO-4) position bearing

with the speed of the rotating ring. This pressure is

rollers (31.6). Thrust washers (31.1 and 31.5) position

directed to the hydraulic system for control of the lockup

the pinions and absorb the pinion end-thrust forces. The

clutch and the downshift inhibitor.

spindles are pressed into the carrier and locked in place

by pins (31.7). The forward end of the intermediate-

2-7.

Intermediate- and Low-Range Clutches

range carrier is splined to internal-splined disks (10) of

a. Description (FO-4)

the high range clutch and thus acts as a hub for the high

(1) The intermediate- and low-range

range clutch. The rear end of the intermediate range

clutches are closely similar in construction, and use

carrier is splined and engages low-range spur gear (44).

identical disks and pistons. Return springs (39) and

b. Operation (FO-4)

rivets (40) for these clutches are used in common for

(1) When the intermediate-range clutch is

both the low- and intermediate-range clutch pistons.

engaged, ring gear (29) is prevented from rotating Sun

Both clutches react against a common clutch spacer

gear (19), being driven by the converter output shaft,

assembly (36). The intermediate-range clutch is forward

rotates pinions (31.3) which mesh with ring gear (29).

of the clutch spacer (37) and the low-range clutch is

The rotating pinions then travel within the circumference

behind it.

of the stationary ring gear. Thus, the torque imparted by

(2) The intermediate-range clutch has

the sun gear to the pinions is transmitted to the carrier

four external-tanged disks (27 and 33, FO-4) which

and causes it to rotate.

engage pins (38) in spacer (37). The spacer is held

(2) Torque of the carrier is transferred to

stationary by dowel pins (35). Positioned alternately

low range spur gear (44, FO-4). The low-range spur

between the external-tanged disks are three internal-

gear meshes with the pinions of low-range planetary

splined disks (28 and 34) which engage intermediate-

carrier assembly (50), which, in turn, mesh with low-

range gear assembly (29). Piston (22) travels in a bore,

range sun gear (19) (integral with the intermediate-range

machined into the rear of the dividing wall in the torque

sun gear). Thus, there are two rotational forces acting

converter.

on the low-range planetary carrier sun gear (19) and

(3) The low-range clutch has five external

spur gear (44).

tanged disks (41, FO-4) which also engage pins (38)in

stationary clutch spacer (37). Positioned alternately

between these disks are four internal-splined disks (42)

2-3