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manual driveline > unit 4 > Flashcards

unit 4 Flashcards

1
Q

An electronic solenoid used to prevent accidental engagement into reverse gear while the vehicle is moving forward.

A

electronic reverse lockout

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2
Q

A part of the synchronizer that helps hold the synchronizer collar in position.

A

spring-loaded key

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3
Q

A shift fork used to engage the reverse gear.

A

reverse shift fork

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3
Q

The use of a small gear to drive a large gear. The result is in an increase in torque but a decrease in speed.

A

gear reduction

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3
Q

A synchronizer used in all current transmissions. It uses a blocking ring. Also called a blocker ring synchromesh unit.

A

baulk-ring synchromesh unit

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4
Q

The curve created by a smooth spiral and used in the angle of gear teeth and coil springs.

A

helix

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5
Q

A seal that has a spring to maintain pressure on the seal’s surface to prevent leakage.

A

garter spring lip seal

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6
Q

A mechanism that moves the synchronizer sleeve to lock the gear to the main shaft.

A

shift fork

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7
Q

The increase of torque.

A

torque multiplication

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8
Q

Resistance that is present from tires contacting the road and wind resistance against the vehicle while rolling down the highway.

A

rolling resistance

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9
Q

The U-shaped cutaway in shift shafts that the shifter lever fits into.

A

selector gate

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10
Q

A shifting problem in which the shifter will not move smoothly into the desired gear, requiring excessive force by the driver to set it into gear.

A

hard shifting

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11
Q

A rounded or angled edge located on the blocking ring, with ridges machined into it to help grab the cone surface of the gear.

A

chamfer

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12
Q

A gear used in between two gears to change the direction of the rotation of the driveshaft or drive axles in the transmission.

A

idle gear

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13
Q

A mechanical device that prevents engagement of two different gears at the same time

A

interlock mechanism

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14
Q

The sleeve that slides to lock the selected gear to the main shaft. The synchronizer sleeve is part of the synchronizer assembly.

A

synchronizer sleeve

15
Q

An electronic sensor that reads the driveshaft speed and sends either an analog or a digital signal to the computer that corresponds to the road speed of the vehicle.

A

vehicle speed sensor

16
Q

The cam and lock pin operated by an electronic solenoid that keeps the reverse gear in lockout until it is selected.

A

lockout solenoid

17
Q

A shifting mechanism or electronic control usually attached to the steering wheel.

A

paddle

18
Q

Oil seal flutes or swirls that are part of the oil seal and that create a pumping action to return oil to the transmission as the shaft rotates, enabling lubrication.

A

hydrodynamic seal

19
Q

A rod that is attached to the shift fork. These rails move when the shifter lever is moved against them.

A

selector shift rail

20
Q

A seal that is a complete circle. If a cutaway is done, it will also be a complete circle. These seals are usually set into a groove that is machined into the housing or part that does not move and is intended to be sealed.

A

o-ring seal

21
Q

A roller in the rear of the input shaft that supports the front of the main shaft.

A

pocket bearing

22
Q

An assembly that allows for the selection of gears without grinding by matching the speed of the two assemblies.

A

synchronizer

23
Q

A long cylindrical roller held in position by a cage.

A

roller bearing

24
Q

The lever that the driver uses to shift the transmission.

A

gear shift lever

25
Q

The mechanism that holds or helps hold the shift rail into position to ensure that the gear does not pop out when selected and to let the driver feel when a shift is completed.

A

detent mechanism

26
Q

A hydraulically controlled cylinder that engages or disengages the clutch pedal.

A

hydraulic actuator

27
Q

Resistance encountered when a vehicle travels up a hill, requiring torque to be applied to overcome it.

A

gradient resistance

28
Q

A shim of a prescribed thickness that is used to control shaft clearances in a transmission.

A

selective thickness shim

29
Q

A technique used to shift gears when a non-synchronized transmission is used. The driver must push the clutch in multiple times to change gears.

A

double clutching

30
Q

Typically a small-diameter pin rolling bearing that can be held in a cage or placed into the inside diameter of a hole.

A

needle roller bearing

31
Q

A synchronizer part that increases or decreases a gear’s speed to match shaft speed so that the synchronizer sleeve can lock the gear to the shaft. Also called baulk ring.

A

blocking ring

32
Q

A condition in which the engine and transmission output are turning at the same rate of speed.

A

direct drive

manual driveline (1 decks)

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