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Auto 2 Goosey > Chapter 77 Vocab > Flashcards

Chapter 77 Vocab Flashcards

Vocab for chapter 77

1
Q

road feel

A

slight steering wheel pull caused by road surface irregularities

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2
Q

linkage steering systems

A

found in large, full-size pickup trucks and full-size vans, both two- and four-wheel drive. Include steering wheel, shaft, column, gearbox, linkage through tie-rods, and ball sockets

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3
Q

rack-and-pinion steering systems

A

lighter and are better for passenger cars and small trucks. Include steering wheel, shaft, column, steering pinion gear, rack, gear housing, and tie-rods

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4
Q

steering column assembly

A

consists of the steering wheel, steering shaft, column (outer housing), and, sometimes, ignition key mechanism, a flexible coupling, and a universal joint

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5
Q

ignition lock mechanism

A

mounted on the steering column in most vehicles, normally on the top, right-hand side of the column

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6
Q

ignition switch

A

usually bolted inside the steering column

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7
Q

locking steering wheel

A

to help prevent theft, prevents wheel from turning when ignition key is off by means of a steel pin

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8
Q

collapsible steering column

A

help prevent driver chest and face injury during an accident. Column designed to crumple or slide together when forced forward during a collision. Different types steel mesh (crushing) columns, tube-and-ball (sliding) columns, and the shear capsule (break and slide) columns. Made up of two pieces

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9
Q

tilt steering column/tilt steering wheel

A

has a flex joint, or U-joint, that allows the top half of the column and the steering wheel to be positioned at different angles

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10
Q

manual tilt column

A

uses a lever on the steering column to unlock the flex joint so the wheel can be moved up or down

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11
Q

power tilt column

A

uses a small electric motor, a control switch, and a gear mechanism to change steering wheel angle or height.

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12
Q

memory tilt wheels

A

use a tilt control module (computer) to “remember” more than one steering wheel position. a sensor in steering column provides feedback so the tilt control module knows wheel location.

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13
Q

recirculating-ball gearbox

A

normally used with a linkage steering system on large truck. It has small steel balls that circulate between the gear members

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14
Q

worm shaft

A

the input gear connected to the steering column shaft. The balls fit and ride in the grooves in the worm gear

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15
Q

sector shaft

A

is the output gear from the steering gearbox. It transfers motion to the steering linkage. A sector gear is machined on the inner end of the sector shaft

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16
Q

ball nut

A

rides on the ball bearings and the worm gear. Grooves are cut in the ball nut to match the shape of the worm gear. Cannot rotate, it slides up and down as the worm gear rotates

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17
Q

ball guides

A

route extra ball bearings in and out from between the worm and ball nut

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18
Q

adjusting nut

A

is usually provided to set worm shaft bearing preload

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19
Q

adjusting screw

A

is used to set the sector shaft clearance

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20
Q

gearbox housing

A

provides an enclosure for the other gearbox components. Seals press into the housing to prevent lubricant leakage at the worm and sector shafts.

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21
Q

end cover

A

normally bolts on the housing to cover the end of the sector gear. It can be removed for gearbox service

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22
Q

gearbox ratio/steering ratio/steering gear reduction

A

a comparison between steering wheel rotation and sector shaft rotation. Range from 15:1 to 24:1

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23
Q

variable-ratio gearbox

A

changes the internal gear ratio as the front wheels are turned from the center position. faster when cornering, and provides better control and response when maneuvering

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24
Q

constant-ratio gearbox

A

changes gear reduction from full left to full right

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25
Q

worm-and-roller steering gearbox

A

contains a roller that is mounted on the pinion shaft and meshes with the worm gear. The roller replaces the ball bearings and the ball nut used in the recirculating- ball gearbox. The roller imparts a rotary force on the pitman shaft as the worm gear rotates

26
Q

steering linkage

A

series of arms, rods, and ball sockets that connect the worm-type steering gearbox to the steering knuckles

27
Q

parallelogram steering linkage

A

linkage used with a worm-type gearbox. Typically includes a pitman arm, a center link, and idler arm, and two tie-rod assemblies. Possibly a steering damper

28
Q

pitman arm

A

transfers gearbox motion to the steering linkage. Is splined to the gearbox sector (output) shaft. A large nut and lock washer secure the arm to its shaft. The outer end of the pitman arm is normally connected to the linkage through a ball socket

29
Q

ball sockets

A

provide for motion in all directions between two connected parts. They are needed so the steering linkage is not bent and damaged when the wheels turn or move up and down over rough road surfacesce

30
Q

center link/relay rod

A

a steel bar that connects the right and left sides of the steering linkage. It has holes that accept the pitman arm, tie-rods, and idler arm

31
Q

idler arm

A

supports the end of the center link on the passenger side of the vehicle

32
Q

steering damper

A

is an oil-filled shock absorber found in some parallelogram linkage arrangements. Attached between the vehicle’s frame and the center link to help absorb road shocks

33
Q

tie-rod assemblies

A

fasten the center link to the steering knuckles. Typically consists of two tie-rods and a toe adjustment sleeve. Ball sockets are normally used on both ends of each tie-rod assembly

34
Q

toe adjustment sleeve

A

is provided for changing the length of the tie-rod assembly during wheel alignment. tie-rods and sleeves are threaded so the assembly can be lengthened or shortened to adjust toe-in or toe-out of the front wheels

35
Q

flexible coupling

A

helps keep road shock from being transmitted to the steering wheel and allows for slight misalignment of the steering shaft and steering gear input shaft (pinion shaft)

36
Q

universal joint

A

allows for a change in the angle between the steering column and steering shaft

37
Q

rack-and-pinion steering gear

A

consists of pinion shaft, a rack, a thrust spring, bearings, seals and a gear housing

38
Q

thrust spring

A

preloads the rack-and-pinion gear teeth to prevent excessive gear backlash (play). Adjustment screws or shims may be used to set thrust spring tension

39
Q

rubber dust boots

A

fit over the inner ball sockets to keep out road dirt and water, as well as to hold in lubricating grease

40
Q

power steering systems

A

normally use an engine-driven pump and a hydraulic system to assist steering action. Can also use an electric motor

41
Q

power steering pump

A

is engine driven and produces the hydraulic pressure for steering system operation. has a belt running from the engine crankshaft pulley to power the pump

42
Q

power steering fluid reservoir

A

holds an extra supply of power steering oil or fluid

43
Q

pressure-relief valve

A

used in a power steering system to control maximum oil pressure. Prevents damage by limiting pressure when needed

44
Q

power steering hoses

A

are high-pressure, hydraulic, synthetic rubber hoses that connect the power steering pump and the integral gearbox or the power cylinder. One line serves as the pressure feed line, the other as a return line to the reservoir

45
Q

integral-piston power steering system

A

has the hydraulic piston mounted inside the steering gearbox housing. It consists of a power steering pump, hydraulic lines, and an integral power-assist gearbox

46
Q

integral power steering gearbox

A

contains a conventional worm-and-sector gear, a hydraulic piston, and a flow-direction valve. use spool valve or rotary valve

47
Q

spool valve

A

in an integral power steering gearbox, uses a small spool valve to control the pressure entering the power assist chambers

48
Q

rotary valve

A

in an integral power steering gearbox, has a small torsion bar to detect steering wheel turning direction and turning effort

49
Q

external cylinder power steering system

A

power cylinder is commonly bolted to the frame and center link

50
Q

power rack-and-pinion steering

A

uses hydraulic pump pressure to assist the driver in moving the rack and the front wheels

51
Q

power cylinder

A

hydraulic cylinder machined inside the rack or gear housing

52
Q

power piston

A

hydraulic double-acting piston formed on the rack shaft

53
Q

hydraulic lines

A

steel tubing connecting the control valve and the power cylinder

54
Q

control valve

A

is either a rotary valve or a spool valve that regulates pressure entry into each end of the power cylinder

55
Q

rotary control valve

A

operated by a torsion shaft connected to the pinion gear

56
Q

spool control valvr

A

thrust action of the pinion shaft shifts it to route oil to the power cylinder

57
Q

power steering oil cooler

A

used to remove excess heat from the oil.

58
Q

electronic steering assist

A

uses a small electric motor to help move the rack-and-pinion gearbox

59
Q

proportional rack-and-pinion power steering/speed-sensitive power steering

A

senses vehicle speed and steering load to ensure adequate road feel

60
Q

mechanical four-wheel steering system

A

uses a special front-rack-and-pinion gearbox with a transfer box, which operates a long shaft that extends back to the rear rack

61
Q

hydraulic four-wheel steering system

A

uses a conventional power rack-and-pinion steering system up front. A vane pump forces fluid to the rack to provide power assist. Hydraulic lines extend back to a rear power steering pump, which is driven by the differential. Requires a certain road speed to be reached

62
Q

electronic four-wheel steering systems

A

have an electric motor-driven power rack that acts upon the rear wheels via its own recirculating-ball drive and mechanical links

Auto 2 Goosey (15 decks)

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