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Topic: Differential gear

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	Differential (mechanics) - Wikipedia, the free encyclopedia
		Differential mechanisms possess two degrees of freedom (DOF), and the state of the mechanism depends on two constraints.
		The sensibility of the computer controlled differential is also limited by the time delay caused by sensors and the response time of the actuators.
		There are many claims to the invention of the differential gear, but it is likely that it was known, at least in some places, in ancient times.
	en.wikipedia.org /wiki/Differential_gear (1239 words)

	Driveshafts and Drive Axles, Page 2 of 3
		The differential pinion (drive) gears are mounted on the pinion shaft and rotate with the shaft (4).
		Differential side gears (driven gears) are meshed with the pinion gears and turn with the differential housing and ring gear as a unit (5).
		So most importantly, with the side gear and the differential case turning at the same speed, the other wheel is forced to rotate in the same direction and at the same speed as the differential case.
	www.icarumba.com /cobrands/contentmodules/resourcecenter/encyclopedia/icar_resourcecenter_encyclopedia_driveshaft2.asp (1158 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		GEARED TRANSMISSIONS This invention relates to transfer gearing for transmitting power between first and second members rotating about parallel axes in automotive transmissions, for example in which power from the output shaft of a main gearbox must be transmitted to a pair of propeller shafts respectively extending fore and aft of the vehicle.
		The kinematic forces acting on the intermediate gears coupled with the elasticity of the materials of the gear assemblies means that in reality one of the intermediate gears tends to be forced inwards towards the plane of the input/output shafts, whilst the other intermediate gear tends to be forced outwards away from that plane.
		Gear 14 is formed as a ring gear having internal helical splines engaging complementary splines 42 on the sleeve 40.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/98100.011227&ELEMENT_SET=DECL (3401 words)

	Differential (mechanics) -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		Differentials are typically composed of a gear mechanism in which a ring gear receives input power, which is transferred to two side gears by means of usually two opposing central (A gear with a small number of teeth designed to mesh with a larger wheel or rack) pinion gears on a common shaft.
		This "differential" was actually a (An outer gear that revolves about a central sun gear of an epicyclic train) planetary gearset placed next to an open front differential, not an integrated system.
		Fully integrated active differentials are used on the 2005 (A form of address for a man) MR (additional info and facts about Ferrari F430) Ferrari F430 and on all four wheels in the (additional info and facts about Acura RL) Acura RL.
	www.absoluteastronomy.com /encyclopedia/d/di/differential_(mechanics).htm (969 words)

	LEGO Design (Site not responding. Last check: 2007-10-22)
		Gears should either be put between the girders supporting the axles or very close to the girders on the outside of the girders.
		Figure 8.7 illustrates a sample LEGO geartrain that achieves a gear ratio of 243:1 through the use of five ganged pairs of 8-tooth to 24-tooth gear combinations (this gear ratio may be overly high for a robot drive).
		For example, if a vehicle with a differential gear had a drive axle spinning at X revolutions per minute(rpm), the differential housing would be rotating at X rpm as well, so long as the vehicle is moving directly forward or backward.
	www.owlnet.rice.edu /~elec201/Book/legos.html (2550 words)

	Lubrication system for differential gear unit - Patent 4244242
		The changespeed gearing 30 is drivingly connected at one hand thereof to a crankshaft of engine 11 through the friction clutch 12 and is connected at the other hand thereof to the differential gear unit 13 through the final drive gearing 40.
		The idler gear 31a is permanently meshed with the driving gear 12b on the power output member 12a, and the reverse driving gear 31b is axially spaced from the idler gear 31a and is located adjacent to the right-hand bearing B.sub.4.
		Additionally, in detachment of the differential gear unit 13 from the trans-axle casing 21, each of the wheel axles 15R, 15L is removed from the differential gear unit 13, and each of the retainer members 75, 76 is removed from the trans-axle casing 21.
	www.freepatentsonline.com /4244242.html (2307 words)

	Setting Up a Differential Ring
		The driveshaft is connected to and drives the pinion gear, which in-turn drives the ring gear at a reduced rate and at a 90 degree angle from the driveshaft.
		This is the term used to describe the "clearance" between the ring and pinion gears and is usually measured in thousandths-of-an-inch by a dial indicator.
		The drive side of the ring gear is the side of the tooth that is contacted when the vehicle is accelerating / The coast side is the side of the tooth on the ring gear that is contacted when the vehicle is decelerating (during engine-braking).
	www.thedirtforum.com /differential.htm (1513 words)

	antikythera2-4
		The differential gear assembly in the Antikythera Mechanism.
		Most differentials are three-dimensional, using bevel gears to connect the two coaxial gears to the pinions.
		The larger gear on the pinion is the same size as the larger of the coaxial gears (here, purple); the smaller is the same size as the smaller coaxial gear (here, green).
	www.math.sunysb.edu /~tony/whatsnew/column/antikytheraII-0500/diff4.html (428 words)

	INTRODUCTION TO GEARING - 4x4 and Off-Road Differential Tech - October 2004 Toyota 4x4 @ Off-Road.com (Site not responding. Last check: 2007-10-22)
		Gearing is the key to delivering useable power from an engine through the drivetrain and to the ground.
		The easiest way to check the differential gear ratio in any rear wheel or four-wheel-drive truck is to lift the rear end of the vehicle with a jack and physically rotate the rear tires one complete revolution while counting the number of revolutions that the driveshaft makes.
		A gear-driven or torque-sensing differential is a gear-driven LSD that distributes power equally while still allowing for difference in wheel-speed, as long as both of the drive wheels have an equal amount of traction.
	www.off-road.com /toyota/projects/tacoma/intro-to-gearing (1581 words)

	Automobile Differential Gears
		When the car is moving in a straight line, the differential gears do not rotate with respect to their axes.
		One problem with an automotive differential is that if one wheel is held stationary, the counterpart wheel turns at twice its normal speed as can be seen by examining the complete scheme of automobile differential.
		The gear train in an automobile differential is a common application of gears, but often misunderstood by the lay public.
	www.efunda.com /DesignStandards/gears/gears_auto_diff.cfm (581 words)

	differential gear -- Encyclopædia Britannica
		Gears operate in pairs to transmit and modify rotary motion and torque (turning force) without slip, the teeth of one gear engaging the teeth on a mating gear.
		The Differential Analyzer, as he called it, was an analog calculator that could be used to solve certain classes of differential equations, a type of problem common in physics and engineering applications that is often very tedious to...
		It had a sliding gear transmission and a differential gear with power transmitted to the rear axle by a...
	www.britannica.com /eb/article-9030413?&query=differential&ct= (761 words)

	Rear Axle
		Scoring marks on the pressure face of gear teeth or in the bore are caused by instantaneous fusing of the mating surfaces.
		Gear noise is more prominent between 30 to 40 mph (48 to 64 km/h) and 50 to 60 mph (80 to 96 km/h).
		Abnormal gear noise is quite rare and if present it usually originates from scoring of the ring and drive pinion gear as a result of insufficient or improper lubrication of the axle assembly.
	www.dippy.org /svcman/sm03.html (2497 words)

	[No title]
		The section of the locking gear assembly that is located near the front of the car is designed so that a selector mechanism can 'freeze up' either side of the differential gear, or let them both spin.
		The gear selector mechanism (green) chooses which side to lock up by using a second differential gear to measure the difference between the torque being applied by the motor, and the torque being transfered to the ground via the rear axle.
		As the difference in input motion on the green differential grows with respect to the output motion on the rear axle, a torque is applied to the differential body, which is transfered to the spring-loaded selector arm.
	www.last-outpost.com /~malakai/lego (1754 words)

	Rebuild An 8-Inch Differential
		Sometimes the ring gear has to be driven from the differential with a punch.
		Divide the differential with a chisel or putty knife.
		The pinion gear is fitted with a crush sleeve, which allows a certain amount of endplay in the pinion shaft.
	www.mustangmonthly.com /howto/41618 (1171 words)

	axle, gear, and differential setup notes
		The 1997 numbers correspond to the ring gear diameters in millimeters, except for the Dana 80, whose diameter specification is 279.4 mm.
		As the pinion gear diameter is reduced, the ring gear thickness is increased to compensate, until a point is reached where the manufacturer moves the ring gear mounting surface on the carrier so the ring gear does not have to get very thick for increasingly higher number ratios.
		You have to "wrench" on the differential quite often, and without an impact wrench that would mean the differential would need to be held in place by a soft jawed vice as depicted in the FSM.
	dodgeram.org /tech/repair/axle/diffsetup.htm (5197 words)

	How the PSD is like a Differential (Site not responding. Last check: 2007-10-22)
		He goes on to explain the Toyota Prius planetary gear arrangement in the PSD in terms of the differential, which is also a three-shaft gear device.
		To do this, the entire differentiating unit rotates, yet the little pinion gears within it are not rotating on their little shafts.
		To do this, the little pinion gears must rotate slowly on their little shafts within the differentiating unit, which itself is rotating.
	home.earthlink.net /~graham1/MyToyotaPrius/SideBars/PsdLikeDiff.htm (572 words)

	Simplicity & Allis-Chalmers Garden Tractor Club, Inc. - differential rebuild question (Site not responding. Last check: 2007-10-22)
		After I reassembled the unit, the differential gear (the inner gear that slides onto the axle) would not drop all the way down to the postion it is supposed to be in.
		Problem is, I can't move the inner pinion gears to align them with the differential gear, as moving the inner pinion gear causes the outer pinion gear to move.
		The gear that is keyed onto the axle stays on the axle, it is not assembled into the diff first.
	www.simpletractors.com /club34/topic.asp?TOPIC_ID=49807 (1184 words)

	FULLSIZEchevy.com - Axle Rebuild (Site not responding. Last check: 2007-10-22)
		If all you are doing is a differential swap, then only half of this guide is for you and all you need is some common tools, a $50.00 differential install kit and to make life much easier ask for adjustable shim packs.
		Gears will work in Silverado and Sierra Trucks with no problems. I don.t know what year the S-10 or S-15 switched, but if you are doing a gear swap on these mid sized trucks get the 7.5.
		Move the ring gear until you hear it make contact with the pinion teeth. You may have to hold the pinion yoke and ring gear and the same time. Move the ring gear back and forth while watching the dial gauge.
	www.fullsizechevy.com /fscu/axletech (3605 words)

	Differential Gear (Site not responding. Last check: 2007-10-22)
		These two motions are combined using three beveled gears in a differential housing.
		The upper gear is driven directly by the motor.
		The middle gear connects the upper and lower gears and is also connected to the middle joint via the drive belt.
	www.egr.msu.edu /microrobot/diff-gear.html (208 words)

	Services - Differential gear repair
		Differential Gears parts and subassemblies manufacturing and replacement, or when possible, reconditioning of defective parts.
		Partial repair: gears and flange replacement and differential housing replacement, bearing retainer replacement, or both.
		Differential Planetary and Satellite Gear (Side and Pinion Gear).
	www.colorita51.biz /eng/differential_gear.htm (105 words)

	How to Check Your Car's Differential Gear Oil - eHow.com
		Cars with rear-wheel drive have a differential, which works together with the two rear axles to allow the rear wheels to turn at the same speed when cornering.
		Locate the differential: it's under the rear middle part of the car, between the two rear wheels, and is shaped and sized like a pumpkin.
		The gear oil should be level with the bolt hole - it should dribble out, or you can reach in and check the level with your finger.
	www.ehow.com /how_7673_check-cars-differential.html (481 words)

	Howstuffworks "How Differentials Work"
		The input pinion is turning the ring gear and cage, and none of the pinions within the cage are rotating -- both side gears are effectively locked to the cage.
		These refer to the gear ratio in the differential.
		If the final drive ratio is 4.10, then the ring gear has 4.10 times as many teeth as the input pinion gear.
	auto.howstuffworks.com /differential3.htm (235 words)

	PROLONG SUPER LUBRICANTS - ORDER PROLONG PRODUCTS! As Seen on TV (Site not responding. Last check: 2007-10-22)
		Directions: Add treatment at 10% of total gear oil volume, first removing the same amount of gear oil to avoid overflow.
		Differentials: Add 10% of total gear oil volume after removing some gear oil if necessary.
		One quart treats standard differentials (3.5 gallon reservoir capacity).
	www.prolongoil.net /trucking.htm (176 words)

	SJM Autotechnik, Audi Parts Specialist, 503-244-2834, Audi Quattro Parts, VW Parts, BMW Parts
		The Audi specified synthetic gear oil SAE 75W/90 with the G50 designation has the part number G 005 000 for the 1 liter size, it is also shown as available in the 0.5 liter size as G 005 000 05.
		The front differential gear oil should be checked as this gear oil check is neglected on many of these FWD Automatic transmissions.
		When checking the front differential oil, look for any signs of ATF fluid in this gear oil as it is very common for the ATF fluid from the Automatic unit to be forced past the shaft seal and into the Front Differential unit.
	www.sjmautotechnik.com /trouble_shooting/trans.html (5576 words)

	A Molecular Differential Gear
		A differential gear links two shafts through a casing, constraining the sum of the rotational angles of the shafts to equal the rotational angle of the casing.
		This cutaway reveals the two cylindrical shafts and their facing bevel (conical) gears, along with two of the four casing-mounted side-gears that mesh with both shaft-gears.
		The larger size of second-row atoms helps in constructing tapered gears and reduces the number of atoms needed to construct the outer cylinder of the casing.
	www.imm.org /Parts/Parts3.html (561 words)

	Toyota Differential Identification - Off-Road.com's Toyota Trucks
		It is used in the rear axle on '79-95 (96?) 4WD trucks and 4Runners, and 3/4 and 1 ton 2WD pickups, and it is also used in the front axle on 79-85 (solid beam) pickups and 4Runners.
		This means I have an 8-inch (rear) axle, 4.30 gears (which is common with automatic transmissions), and a 2-pinion design (common in 4 cylinders).
		It behaves like an open differential most of the time, but when a loss of traction occurs, its small pinion gears (which basically perform the same function as spider gears in an open differential) separate slighly from the side gears and wedge into a pocket on the carrier, which sends torque to the non-slipping wheel.
	www.off-road.com /toyota/tech/other/4_axles.html (1606 words)

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