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from flowing from the pressure side to the suction side.
Park Pawl, Location/Task/Design/Function
Fig. 52: Park Pawl, Location/Task/Design/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Park Pawl, Location
The park pawl gear (4) and park pawl mechanism (4a) are located in the rear part of the transmission
housing. See Fig. 52
.
Park Pawl, Task
Secures the vehicle mechanically to prevent it from rolling in addition to the parking brake.
Park Pawl, Design
See PARK PAWL, DESIGN
.
Park Pawl, Function
See PARK PAWL, FUNCTION
.
Park Pawl, Design
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Fig. 53: Park Pawl, Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Park Pawl, Function
2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 54: Park Pawl, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
In selector lever position "P" the cone (42) moves between the park detent (43) and pilot bushing (40). The
parking lock pawl (43) is therefore pushed against the parking lock gear (4). See Fig. 54. If the tooth of the
parking lock pawl (43) does not engage in a tooth space when the vehicle is stationary, but rather touches a
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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Page 1268 of 4133
tooth of the parking lock gear (4), the cone (42) is pre-tensioned by the spring (41) and positioned ready for
operation. If the parking lock gear (4) continues to turn, the parking lock pawl (43) engages in the next tooth
space.
To prevent damage due to misuse, the intervals between the tooth gaps are such that the park detent (43) can
only engage when the vehicle is stationary or crawling at low speed. If the vehicle rolls faster, the shape of the
teeth prevents the parking lock pawl (43) from engaging.
Planetary Gear Set, Location/Task/Design/Function
2001 Mercedes-Benz ML320
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Page 1269 of 4133
Fig. 55: Planetary Gear Set
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Planetary Gear Set, Location
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Page 1270 of 4133
Three planetary gear sets are used to produce the different gear ratios. These are located in the mechanical
part of the transmission as the front, center and rear planetary gear set (V, M, H). See Fig. 55
.
Planetary Gear Set, Task
Power transmission and production of different gear ratios.
Planetary Gear Set, Design
A planetary gear set consists of the ring gear (1), the planet gears (2) carried in the planet carrier (4) and
the sun gear (3).
Planetary Gear Set, Function
See PLANETARY GEAR SET, FUNCTION
.
Planetary Gear Set, Function
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Page 1271 of 4133
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Fig. 56: Planetary Gear Set, Function (1 Of 5)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - The ring gear (1) and sun gear (3) elements of a planetary gear system are alternately driven and
braked by the actuating elements of the multi-plate clutch and multiple-disc brake. See .Fig. 56
The planet gears
(2) can turn on the internal gearing of the ring gear (1) and on the external gearing of the sun gear (3). This
allows for a variety of gear ratios and the reversal of the rotation direction without the need for moving gear
wheels or shift collars.
The torque and speed are converted corresponding to the lever ratios or the ratio of the number of teeth on the
driven to the driving gears and is known as the gear ratio i. The overall ratio of a number of planetary gear sets
connected in series is obtained by multiplying the partial ratios. When two components of the planetary gear set
are locked together, the planetary gear set is locked and turns as a closed unit.
Advantages Of A Planetary Gear Set:
Shifting Ability Under Load
Several Ratios Can Be Produced
Constant Meshing Of The Gears
Simple Direction Reversal
High Efficiency
Coaxial Location Of Input And Output
Compact Design
The Following Basic Ratio Possibilities Can Be Realized
See Fig. 57
.
Sun Gear Locked
Ring Gear Driving
Planet Gears Driven
Relatively Low Step-Down Ratio
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