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29 Cards in this Set
- Front
- Back
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axle shims |
thin wedges installed under leaf springs that alter the tilt (cant) angle of the axle. Used to define caster angle on steer axles and U-joint working angles on drive axles. |
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brinnelling |
minor indentations on the shoulder or in the valley of a bearing race, usually caused by improper installation. |
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broken-back driveline |
drive shaft geometry in which the U-joint working angles are equal but the yokes are not parallel. |
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center support bearing |
a hanger bearing used to suspend the first section of a drive shaft in a double drive shaft assembly. It is required on truck drive shafts when the distance between the transmission and drive carrier exceeds 70 inches or so and consists of a rolling bearing element supported by a rubber insulator and bracket. Also known as hanger bearings. |
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compound angle |
occurs when a drive shaft is angled on both horizontal and vertical planes. |
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drive shaft |
used to transmit drive torque between the differential carrier assembly and the drive wheels. A better term is axle shaft because it avoids confusion. Also known as half shaft. |
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false brinnelling |
a manufacturing characteristic that can surface polish bearing races without creating any damage. Technicians should learn to recognize this to avoid replacing bearings that are functionally sound. |
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galling |
a metal-to-metal wear failure characteristic caused by lack of lubricant or extreme overload. |
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Glidecoat |
blue-colored, wear-resistant coating applied to Spicer drive shaft slip splines. |
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hanger bearing |
the center support bearing used to suspend the first section of the drive shaft in a double drive shaft assembly; used on truck drivelines when the distance between the transmission and drive carrier exceeds 70 inches or so. Consists of a sealed rolling element bearing that is supported by a rubber insulator and mounted in a bracket assembly. Also known as center support bearing. |
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inclinometer |
used to make angular measurements on driveline components and drivelines; may use a liquid level, laser, or electronic operating principle. |
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in-phase |
usually used to mean properly timed or properly balanced. A drive shaft that is in-phase would be assembled balanced and with the yokes aligned. |
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journal cross |
the core component of a U-joint consisting of four equally spaced trunnions on the same plane. |
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nonparallel driveline |
one in which the working angles of the U-joints of the drive shaft are equal but the companion flanges and/ or yokes are not parallel. Also known as a broken-back driveline. nose the front of a trailer. |
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out-of-phase |
term used to describe components that are mechanically out of time or balance with each other. |
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ovality |
describes something that is not circular; egg-shaped. A measurement of ovality is an indication of eccentricity in a supposedly concentric component. |
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parallel-joint driveline |
in driveline terminology, a drive shaft construction in which all of the companion flanges and yokes are parallel with the working angles of the U-joints set to being equal and opposite. |
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phase angle |
relative rotational position of each yoke ear on a drive shaft. |
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pitting |
surface irregularities that usual result from corrosion or abrasive action. |
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propeller shaft |
see drive shaft. |
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runout |
any kind of wobble in a rotating component. Runout may be axial or radial. Using the example of a wheel on a vehicle, axial runout would be wobble as viewed from the front or rear of the vehicle, and radial runout would be wobble viewed from the side of the vehicle. |
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slip spline |
used on a drive shaft (propeller shaft) stub and yoke assembly to permit variations in length caused by frame and suspension oscillations while transmitting drive torque. |
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spider |
the axle hub mounting to which truck foundation brakes are mounted. Also a slang term for a U-joint cross or trunnion. |
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trunnion |
in U-joints, the bearing races of a cross or spider assembly. Also the suspension sub-frame assembly used on some tandem drive highway tractors. |
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U-joint |
U-joint see universal joint. |
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universal joint |
an assembly consisting of a trunnion cross and bearings that connects a pair of yokes for purposes of transmitting drive torque on an angled plane. |
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yoke |
any of a number of different fork-shaped components. Shift yokes (on shift rails) fit to dog clutches in a transmission to move them in and out of engagement. A pair of drive shaft yokes couple to each other using a U-joint as an intermediary. |
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zerk fitting |
a standard grease nipple. Its orifice is sealed with a spring-loaded ball that unseats when pressurized grease is applied to it. |
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spalling |
surface fatigue that occurs when chips, scales, or flakes of surface metal separate because of fatigue rather than wear. |
