83-628: The Austin Rover Group (abbreviated ARG ) was a British motor manufacturer. It was created in 1982 as the mass-market car manufacturing subsidiary of British Leyland (BL). Previously, this entity had been known as BL Cars Ltd (formerly Leyland Cars ) which encompassed the Austin-Morris and Jaguar-Rover-Triumph divisions of British Leyland. After a major restructuring of BL's car manufacturing operations, Jaguar regained its independence (leading to its eventual de-merger in 1984) whilst
166-568: A collaborative agreement with Honda , the first product of this alliance being the Triumph Acclaim , which paved the way for the joint development of a range of cars which spearheaded the company's revival in the 1980s and 1990s. Lastly, the number of BL dealerships in the UK was trimmed down drastically. The new, slimmer British Leyland was organised into a series of groups. Austin Rover handled
249-623: A decade after its demise that was brought about by the collapse of MG Rover. In 1968 British Leyland had created Austin Morris Ltd as an operating company that managed all the previous operations of the British Motor Corporation which it had absorbed, but it was not until 1978 that Austin-Morris was given a formal corporate identity (distinct from the Jaguar Rover Triumph (JRT) arm of the company) with
332-698: A gap in the range vacated by a scaling down of Mini and Austin Allegro production. At its peak in 1983, the Metro was Britain's third best selling car with more than 130,000 sales. The Austin Maestro , launched in March 1983, was initially very popular, but sales dipped towards the end of the decade and in 1989 it was the 19th best selling new car in the UK with less than 40,000 sales, having peaked in 1984 at more than 80,000 sales as Britain's sixth best selling car. This
415-473: A government demand for a four-wheel-drive passenger vehicle. The modern Geländewagen such as the Mercedes-Benz G-Class still feature some of the attributes, with the exception of fully independent suspension, since it can compromise ground clearance. The Unimog is also a result of Mercedes 4x4 technology. The first Russian-produced four-wheel-drive vehicle, also in part for civilian use, was
498-587: A mechanical differential between the front and rear axles. An example of this is the dual-motor variant of the Tesla Model S , which controls the torque distribution between its two motors electronically. According to the SAE International standard J1952, AWD is the preferred term for all the systems described above. The standard subdivides AWD systems into three categories. Part-time AWD systems require driver intervention to couple and decouple
581-534: A production GT sports car. While most 4WD systems split torque evenly, the Jensen split torque roughly 40% front, 60% rear by gearing the front and rear at different ratios. American Motors Corporation (AMC) acquired Kaiser's Jeep Division in 1970 and quickly upgraded and expanded the entire line of off-road 4WD vehicles. With its added roadworthiness, the top-range full-sized Grand Wagoneer continued to compete with traditional luxury cars . Partially hand-built, it
664-576: A set of specific components and functions, and intended off-road application, which generally complies with modern use of the terminology. Four-wheel-drive systems were developed in many different markets and used in many different vehicle platforms . There is no universally accepted set of terminology that describes the various architectures and functions. The terms used by various manufacturers often reflect marketing rather than engineering considerations or significant technical differences between systems. SAE International 's standard J1952 recommends only
747-550: A total of 41,674 units made by 1928. Daimler-Benz also has a history in four-wheel drive. After the Daimler Motoren Gesellschaft had built a four-wheel-driven vehicle called Dernburg-Wagen , also equipped with four-wheel steering , in 1907, that was used by German colonial civil servant, Bernhard Dernburg, in Namibia ; Mercedes and BMW, in 1926, introduced some rather sophisticated four-wheel drives,
830-606: A trend set by the Volkswagen Golf GTI since 1976. By 1985, Austin Rover had launched a line-up of performance variants of its Metro and Maestro hatchbacks and the Montego saloon. These cars were badged as MG models and proved popular, especially in the form of the MG Metro. MG models accounted for approximately 10% of Metro, Maestro and Montego production between 1982 and 1991. The Rover Group continued production of
913-399: A two-door roadster, a two-door pickup truck, and a four-door phaeton, all equipped with a transfer case that engaged the front wheels, powered by a 1.3-litre, two-cylinder, air-cooled OHV V-twin engine. The 1937 Mercedes-Benz G5 and BMW 325 4×4 featured full-time four-wheel drive, four-wheel steering, three locking differentials, and fully independent suspension. They were produced because of
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#1732780973566996-412: A wheel is slipping, and only activates when wheel slip is detected. Therefore, typically no mechanism exists to actively prevent wheel slip (i.e., locking the differential in advance of wheel slip is not possible); rather, the system is designed to expressly permit wheel slip to occur, and then to attempt to send torque to the wheels with the best traction. If preventing all-wheel slip is a requirement, this
1079-423: Is a limiting design. The architecture of an AWD/4WD system can be described by showing its possible operating modes. A single vehicle may have the ability to operate in multiple modes depending on driver selection. The different modes are: In addition to these basic modes, some implementations can combine these modes. The system could have a clutch across the center differential, for example, capable of modulating
1162-430: Is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer case providing an additional output drive shaft and, in many instances, additional gear ranges . A four-wheel drive vehicle with torque supplied to both axles is described as "all-wheel drive" (AWD). However, "four-wheel drive" typically refers to
1245-441: Is distributed to all four wheels, a third or 'center' differential can be used to distribute power between the front and rear axles. The described system handles extremely well, as it is able to accommodate various forces of movement and distribute power evenly and smoothly, making slippage unlikely. Once it does slip, however, recovery is difficult. If the left front wheel of a 4WD vehicle slips on an icy patch of road, for instance,
1328-458: Is exceeded at the low-traction side. A fairly recent innovation in automobiles is electronic traction control . It typically uses a vehicle's braking system to slow a spinning wheel. This forced slowing emulates the function of a limited-slip differential, and by using the brakes more aggressively to ensure wheels are being driven at the same speed, can also emulate a locking differential. This technique normally requires wheel sensors to detect when
1411-460: Is much less acceptable for 4WD vehicles, because 4WD vehicles have twice as many wheels with which to lose traction, increasing the likelihood that it may happen. 4WD vehicles may also be more likely to drive on surfaces with reduced traction. However, since torque is divided between four wheels rather than two, each wheel receives roughly half the torque of a 2WD vehicle, reducing the potential for wheel slip. Many differentials have no way of limiting
1494-534: The Austin Allegro and Morris Marina , despite being fundamentally superior vehicles for their time. The Austin/MG Metro was regularly among the top five selling cars in Britain throughout the 1980s, and for two years in the early part of the decade it was the best selling supermini in Britain. The Metro, which was launched in 1980, gave the firm a much-needed competitor in modern supermini market and filled
1577-568: The Canadian Military Pattern trucks , of which 4x4s were by far the most prevalent of their various driveline configurations. All told, North America built about 1 + 1 ⁄ 2 million 4x4 driven vehicles during the war, Availability of certain critical components, such transfer cases and especially constant-velocity joints affected development. Though not used much on commercial vehicles, all-wheel drive vehicles all needed these; and they would use two or three times
1660-632: The GAZ-61 , developed in the Soviet Union in 1938. "Civilian use" may be a bit of a misnomer, as most, if not all, were used by the Soviet government and military (as command cars), but the GAZ-61-73 version is the first four-wheel-drive vehicle with a normal closed sedan body. Elements of the chassis were used in subsequent military vehicles such as the 1940 GAZ-64 and the 1943 GAZ-67 , as well as
1743-672: The MG assembly plant in Abingdon , and the Triumph plants in Speke (Liverpool) and Canley (Coventry). BL pulled out of entire markets – for example the large Leyland tractors range was sold-off wholesale to Marshall , and Jaguar was privatised in 1984. Many of BL's non-core subsidiaries (such as refrigerator company Prestcold and industrial engine manufacturer Coventry Climax ) were also culled during Edwardes' tenure. Thirdly, he entered into
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#17327809735661826-746: The Morris Marina and Princess , but the Montego actually replaced the Morris Ital and Austin Ambassador which were the respective facelifted versions of those two cars. Austin Rover's executive car, the Rover 800 , was launched in July 1986 as the third product of its venture with Honda, sharing its development with the Honda Legend . This car also sold well, being a popular competitor for
1909-648: The Triumph and Morris marques were retired. The new, leaner car business was rechristened as the Austin Rover Group and focused primarily on the Austin and Rover marques. The Morris and Triumph marques continued briefly within ARG until 1984 when both were dropped. In 1989, two years after the Austin brand was also discontinued, ARG assumed the name of its parent company Rover Group plc , from which point
1992-539: The k. u. k. Hofwagenfabrik Ludwig Lohner & Co. in Vienna in 1899, presented to the public during the 1900 World Exhibition in Paris. The vehicle was a series hybrid car that used an electric hub motor at each wheel, powered by batteries, which were in turn charged by a gasoline-engine generator. It was clumsily heavy, and due to its unusual status, the so-called Lohner–Porsche is not frequently given its credit as
2075-585: The 1920s. Today in North America, the term is applied to both heavy vehicles and light passenger vehicles. When referring to heavy vehicles, the term is increasingly applied to mean "permanent multiple-wheel drive" on 2×2 , 4×4, 6×6, or 8×8 drive-train systems that include a differential between the front and rear drive shafts. This is often coupled with some sort of antislip technology, increasingly hydraulics-based, that allows differentials to spin at different speeds, but still be capable of transferring
2158-672: The American Four Wheel Drive Auto Company (FWD) of Wisconsin , founded in 1908. (not to be confused with the term "FWD" as an initialism for front-wheel-drive ) Along with the 1 1 ⁄ 2 - and 2-ton Nash Quad (see below), the 3-ton FWD Model B became a standard military four-wheel-drive truck for the U.S. Army in World War I. Some 16,000 FWD Model B trucks were built for the British and American armies during World War I – about half by FWD and
2241-480: The British press). Robinson had assumed a greater level of control over BL than any of its senior managers, and his network of union leaders in the various BL plants had the power to end production if he had instructed them to do so. The incumbent government of the time ran out of patience with Robinson, and appointed South African-born corporate troubleshooter Sir Michael Edwardes to turn BL around. His first task
2324-567: The Cowley factory, which began production of an all-new Mini in the summer of 2001. Land Rover , meanwhile was sold to Ford, who had already purchased Jaguar in 1989. MG production was revived in 2007 by new owner Nanjing Automobile , while the rights to use the Rover marque were purchased by Ford in 2006, only to be transferred to ownership of Indian carmaker Tata in 2008, as Tata also took over Land Rover and Jaguar to form Jaguar Land Rover . The Rover marque has yet to be revived more than
2407-563: The G1, the G4, and G4 following. Mercedes and BMW developed this further in 1937. The American Marmon-Herrington Company was founded in 1931 to serve a growing market for moderately priced four-wheel-drive vehicles. Marmon-Herrington specialized in converting Ford trucks to four-wheel drive and got off to a successful start by procuring contracts for military and commercial aircraft refueling trucks, 4×4 chassis for towing light weaponry, and an order from
2490-506: The Iraqi Pipeline Company for what were the largest trucks built at the time. The early Marmon-Herringtons proved to be the exception to the rule — 4WD cars and trucks developed in the 1930s were mainly built for governments, with (future) warfare applications in mind. Dodge developed its first four-wheel-drive truck in 1934 — a military 1 + 1 ⁄ 2 ton designated K-39-X-4(USA), of which 796 units were built for
2573-493: The J1952 standard notes secondary classifications resulting in a total of eight systems, designated as: Two wheels fixed to the same axle (but on the opposite axle ends) need to turn at different speeds as a vehicle goes around a curve. The reason is that the wheel that is located on the inner side of the curve needs to travel less distance than the opposite wheel for the same duration of time. However, if both wheels are connected to
Austin Rover Group - Misplaced Pages Continue
2656-616: The Jeep, and also inline-four powered, the Land Rover appeared at the Amsterdam Motor Show in 1948. Originally conceived as a stop-gap product for the struggling Rover car company, despite chronic underinvestment, it succeeded far better than their passenger cars. Inspired by a Willys MB – the ubiquitous WWII "jeep" – that was frequently run off-road on the farm belonging to chief engineer Maurice Wilks , Land Rover developed
2739-588: The MG Metro until 1990 when it was replaced by the Rover Metro GTi. MG Maestro and Montego production continued at Cowley until 1991, when these models were discontinued to make way for the GTi variants of the Rover 200 and 400. However, the last Maestro and Montego models survived in production until December 1994, just before the 200 and 400 ranges – which had been expected to replace them – were themselves replaced. In 1986, Austin Rover's parent company, BL plc,
2822-536: The North American market, the term generally refers to a system optimized for off-road driving conditions. The term "4WD" is typically designated for vehicles equipped with a transfer case that switches between 2WD and 4WD operating modes, either manually or automatically. All-wheel drive (AWD) was historically synonymous with "four-wheel drive" on four-wheeled vehicles, and six-wheel drive on 6×6s , and so on, being used in that fashion at least as early as
2905-596: The Triumph Acclaim to take over its production lines. The Austin Montego went on sale in April 1984 and sold well, being Britain's seventh best selling car in 1985 and 1986, though it was unable to match the sales success of the sector's established favourites – the Ford Sierra and Vauxhall Cavalier . The car had been in the pipeline since the late 1970s when the company's main competitors in this sector were
2988-428: The U.S. Army in several configurations. Timken supplied front axles and transfer cases, added to militarized a civilian truck. The Timken transfer case was the first part-time design, that allowed the driver to engage or disengage four-wheel drive using a lever inside the cab. In spite of the limited 1930s U.S. military budgets, the '34 truck was liked well-enough that a more modern 1 + 1 ⁄ 2 ton truck
3071-480: The amount of engine power that gets sent to their attached output shafts. As a result, if a tire loses traction on acceleration, either because of a low-traction situation (e.g., driving on gravel or ice) or the engine power overcomes available traction, the tire that is not slipping receives little or no power from the engine. In very low-traction situations, this can prevent the vehicle from moving at all. To overcome this, several designs of differentials can either limit
3154-442: The amount of slip (these are called 'limited-slip' differentials) or temporarily lock the two output shafts together to ensure that engine power reaches all driven wheels equally. Locking differentials work by temporarily locking together a differential's output shafts, causing all wheels to turn at the same rate, providing torque in case of slippage. This is generally used for the center differential, which distributes power between
3237-547: The blue and green "chevron" logo (officially known as the "wing"), which began appearing on Austin and Morris-badged BL cars in that year – the Princess 2 and the van/pick-up versions of the Morris Marina were the first vehicles to wear the logo. However, this separate branding strategy was later abandoned and by 1983 the chevron would be later expanded to represent virtually all of BL's marques and business activities in
3320-692: The cars themselves (see below). The combine now known as Rover Group remained in BAe ownership until January 1994, when it was sold to BMW . It remained in BMW ownership for six years before being sold to the "Phoenix Consortium" in May 2000, incorporating the MG and Rover marques and becoming MG Rover , which lasted five years before going bankrupt. The ownership of the Mini brand, however, remained in BMW ownership, as did ownership of
3403-473: The complete front-engine, four-wheel-drive system. The AMC Eagle was offered as a sedan , coupe , and station wagon with permanent automatic all-wheel drive passenger models. The new Eagles combined Jeep technology with an existing and proven AMC passenger automobile platform . They ushered a whole new product category of "sport-utility" or crossover SUV . AMC's Eagles came with the comfort and high-level appointments expected of regular passenger models and used
Austin Rover Group - Misplaced Pages Continue
3486-518: The creation of the Austin Rover brand was intended to present a new public face of the company, although at corporate level it was still known as "BL plc". However, the huge industrial relations problems, ineffectual management and product duplication that had plagued the company up to the nationalisation continued throughout the late 1970s. The problems centered on Longbridge union leader and shop steward Derek Robinson (nicknamed "Red Robbo" by
3569-409: The differential to the wheel, at different speeds. The differential does this by distributing angular force (in the form of torque ) evenly, while distributing angular velocity (turning speed) such that the average for the two output shafts is equal to that of the differential ring gear . When powered, each axle requires a differential to distribute power between the left and right sides. When power
3652-545: The driver of getting out to lock hubs and having to manually select between 2WD and 4WD modes, it dominated all other makes in FIA rally competition. Gene Henderson and Ken Pogue won the Press-on-Regardless Rally FIA championship with a Quadra Trac-equipped Jeep in 1972. American Motors introduced the innovative Eagle for the 1980 model year. These were the first American mass-production cars to use
3735-587: The early years of the war, they relied significantly on Lend-Lease vehicles, provided by the western allies. In 1943, they launched a further-developed version: the GAZ-67 . By contrast, the Axis powers ' closest equivalent to the jeep, the VW Kübelwagen , of which only some 50,000 were built, though being equipped with portal gear hubs, only had rear-wheel drive. Willys introduced the model CJ-2A in 1945,
3818-562: The exception of the reengineered R6 Metro of 1990, the Rover name was never officially used for these models. One interesting anomaly from the ARG era is that the chevron logo was stamped into thousands of BL/Rover Group vehicle components, many of which survived on Rover and Land Rover models into the 21st century; indeed there are still some components – most notably on the Land Rover Defender until it finished production in 2016 – which still bear both it and some still even bear
3901-492: The first four-wheel driven automobile. The world's first four-wheel-drive car directly powered by an internal-combustion engine, and the first with a front-engine, four-wheel-drive layout , was the Dutch Spyker 60 H.P., Commissioned for the Paris to Madrid race of 1903, it was presented that year by brothers Jacobus and Hendrik-Jan Spijker of Amsterdam . The two-seat sports car featured permanent four-wheel drive and
3984-530: The first full-production four-wheel-drive vehicle for sale in the general marketplace. Due to the ubiquitous World War II Jeep's success, its rugged utilitarianism set the pattern for many four-wheel-drive vehicles to come. Dodge also started production of the civilian 4WD Power Wagon trucks, for the 1946 model year. Both the Willys and the Dodge were developed directly from their WW II predecessors. Equally boxy to
4067-703: The forerunner of the designs that followed from other manufacturers. The automobile press at the time tested the traction of the Eagles and described it as far superior to the Subaru's and that it could beat many so-called off-road vehicles. Four Wheeler magazine concluded that the AMC Eagle was "The beginning of a new generation of cars." The Eagles were popular (particularly in the snowbelt ), had towing capacity, and came in several equipment levels including sport and luxury trims. Two additional models were added in 1981,
4150-400: The front and the rear axles. While a drivetrain that turns all wheels equally would normally fight the driver and cause handling problems, this is not a concern when wheels are slipping. Some designs use gearing to create a small rotational difference that hastens torque transfer. A typical Torsen II differential can deliver up to twice as much torque to the high-traction side before traction
4233-402: The front axle torque from a full-time mode with the 30:70 torque split of the center differential to the 0:100 torque split of the 2WD mode. In 1893, before the establishment of the modern automotive industry in Britain, English engineer Bramah Joseph Diplock patented a four-wheel drive system for a steam-powered traction engine , including four-wheel steering and three differentials , which
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#17327809735664316-532: The front two in front-wheel drive or the rear two in rear-wheel drive . Similarly, a 6×4 vehicle has three axles, two of which provide torque to two axle ends each. If this vehicle were a truck with dual rear wheels on two rear axles, so actually having ten wheels, its configuration would still be formulated as 6x4. During World War II, the U.S. military would typically use spaces and a capital 'X' – as "4 X 2" or "6 X 4". Four-wheel drive (4WD) refers to vehicles with two axles providing torque to four axle ends. In
4399-404: The inclusion or exclusion of a low-range gear. On-demand AWD systems drive the secondary axle via an active or passive coupling device or "by an independently powered drive system". The standard notes that in some cases, the secondary drive system may also provide the primary vehicle propulsion. An example is a hybrid AWD vehicle where the primary axle is driven by an internal combustion engine and
4482-791: The likes of the Ford Granada and Vauxhall Carlton . It was also sold in America under the Sterling brand, but this project was quickly shelved due to unacceptable product quality issues that led to low sales. Austin Rover's decision not to replace sports cars like the MG MGB and Triumph TR7 was justified by the fact that sports cars were no longer popular in the early 1980s, and many other manufacturers had also stopped – or were about to stop – production of sports coupes and roadsters. Buyers were instead being guided to "hot hatchbacks", following
4565-524: The logo still appeared on the badging of the former Austin models, and the VIN plates of the cars still read "Austin Rover Group Ltd", since this was still the manufacturer's official name until 1989. For that model year the chevron logo was finally dropped in favour of a black silhouetted version of the Rover "longship" badge upon which the model name (Metro, Maestro, Montego) was applied, although with
4648-528: The mass production of cars, with the smallest and cheapest models being sold under the Austin brand, while the more upmarket models carried a Rover badge. High performance version of the Austin hatchbacks and saloons made use of a revived MG badge. Light commercial vehicle production ( 4x4s and vans) was managed by the Land Rover Group , whilst full-size commercial vehicles were built by Leyland Trucks and Leyland Bus . The luxury manufacturer Jaguar
4731-415: The military on a large scale, four-wheel drive and all-wheel-drive vehicles had not found their place. The World War II Jeep , originally developed by American Bantam , but mass-produced by Willys and Ford, became the best-known four-wheel-drive vehicle in the world during the war. The American Dodge WC series and Chevrolet G506 4x4 variants were also produced by the hundreds of thousands, as well as
4814-460: The more refined yet still off-road capable luxury 4WD Range Rover in the 1970s. With the acquisition of the "Jeep" name in 1950, Willys had cornered the brand. Its successor, Kaiser Jeep , introduced a revolutionary 4WD wagon called the Wagoneer in 1963. Not only was it technically innovative, with independent front suspension and the first automatic transmission coupled to 4WD, but also it
4897-522: The number of driven axles, meaning more gears to cut for all the differentials. Produced up to the war by a few specialized firms with limited capacity, from spring 1942, Ford, Dodge, and Chevrolet joined in fabricating these in a quantity more than a 100-fold greater than in 1939. Although Russia had their own jeep-like vehicle (the GAZ-64) up and running in 1940, a year earlier than the American jeep, in
4980-425: The off-road technology for an extra margin of safety and traction. The Eagle's thick viscous fluid center differential provided a quiet and smooth transfer of power that was directed proportionally to the axle with the greatest traction. This was a true full-time system operating only in four-wheel drive without undue wear on suspension or driveline components. No low range was used in the transfer case. This became
5063-789: The older BL roundel logo. A number of new models were in development at the time that Austin Rover Group ceased to exist – including the second generation Rover 200 Series, launched in October 1989 and the new Metro which was launched in May 1990. British Leyland Too Many Requests If you report this error to the Wikimedia System Administrators, please include the details below. Request from 172.68.168.226 via cp1108 cp1108, Varnish XID 219589163 Upstream caches: cp1108 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 08:02:53 GMT 4x4 A four-wheel drive , also called 4×4 ("four by four") or 4WD ,
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#17327809735665146-572: The postwar GAZ-69 , and the properly civilian GAZ-M-72, based on the rear-wheel drive GAZ-20 "Victory" and built from 1955 to 1958. Soviet civilian life did not allow the proliferation of civilian products such as the Jeep in North America, but through the 1960s, the technology of Soviet 4×4 vehicles stayed on par with British, German, and American models, even exceeding it in some aspects, and for military purposes just as actively developed, produced, and used. Until "go-anywhere" vehicles were needed for
5229-404: The public domain, eventually supplanting BL's own roundel logo (affectionately known as the "flying plughole" or "the plughole of despair") and would ultimately become the logo of the entire Austin Rover Group. The ARG chevron officially remained in use until 1988, when ARG's rename and reprivatisation into the Rover Group saw it gradually disappear. The Austin name was retired after 1987, however
5312-547: The rest by other licensed manufacturers. Only about 20% of the trucks built were four-wheel drives, but the 4x4s were more often on the front lines. About 11,500 of the Jeffery / Nash Quad trucks were built for similar use between 1913 and 1919. The Quad not only came with four-wheel-drive and four-wheel brakes, but also featured four-wheel steering. The Quad was one of the first successful four-wheel drive vehicles ever to be made, and its production continued for 15 years with
5395-489: The same axle driveshaft, they always have to spin at the same speed relative to each other. When going around a curve, this either forces one of the wheels to slip, if possible, to balance the apparent distance covered, or creates uncomfortable and mechanically stressful wheel hop. To prevent this, the wheels are allowed to turn at different speeds using a mechanical or hydraulic differential . This allows one driveshaft to independently drive two output shafts, axles that go from
5478-491: The secondary axle from the primarily driven axle, and these systems do not have a center differential (or similar device). The definition notes that part-time systems may have a low range. Full-time AWD systems drive both front and rear axles at all times via a center (interaxle) differential. The torque split of that differential may be fixed or variable depending on the type of center differential. This system can be used on any surface at any speed. The definition does not address
5561-412: The secondary axle is driven by an electric motor. When the internal combustion engine is shut off, the secondary, electrically driven axle is the only driven axle. On-demand systems function primarily with only one powered axle until torque is required by the second axle. At that point, either a passive or active coupling sends torque to the secondary axle. In addition to the above primary classifications,
5644-440: The slipping wheel spins faster than the other wheels due to the lower traction at that wheel. Since a differential applies equal torque to each half-shaft, power is reduced at the other wheels, even if they have good traction. This problem can happen in both 2WD and 4WD vehicles, whenever a driven wheel is placed on a surface with little traction or raised off the ground. The simplistic design works acceptably well for 2WD vehicles. It
5727-404: The stark Ryder Report on the ailing firm, the resulting government bail-out and nationalisation saw the company being renamed British Leyland (BL). The car manufacturing subsidiary of BL became Leyland Cars , and later BL Cars Ltd , and it was this entity which ultimately became Austin Rover. The Leyland name had become tainted by the industrial unrest and poor quality cars of the 1970s, and
5810-474: The subcompact SX/4 and Kammback. A manual transmission and a front axle-disconnect feature were also made available for greater fuel economy. During 1981 and 1982, a unique convertible was added to the line. The Eagle's monocoque body was reinforced for the conversion and had a steel targa bar with a removable fiberglass roof section. The Eagle station wagon remained in production for one model year after Chrysler acquired AMC in 1987. Total AMC Eagle production
5893-460: The term "all-wheel drive" with additional subclassifications that cover all types of AWD/4WD/4x4 systems found on production vehicles. "Four-by-four" or "4×4" is frequently used to refer to a class of vehicles in general. Syntactically, the first figure indicates the total number of axle ends and the second indicates the number of axle ends that are powered. Accordingly, 4×2 means a four-wheel vehicle that transmits engine torque to only two axle ends:
5976-544: The torque from a wheel with poor traction to one with better. Typical AWD systems work well on all surfaces, but are not intended for more extreme off-road use. When used to describe AWD systems in light passenger vehicles, it refers to a system that applies torque to all four wheels (permanently or on-demand) or is targeted at improving on-road traction and performance (particularly in inclement conditions), rather than for off-road applications. Some all-wheel drive electric vehicles use one motor for each axle, thereby eliminating
6059-493: The two entities were generally considered one and the same, although they continued to be legally separate – Rover Group plc was a holding company owning Land Rover following the divestment of Unipart and Leyland Trucks , whilst Rover Group Limited was the mass market car manufacturing business. Following the financial collapse of the British Leyland Motor Corporation (BLMC) in 1975 and
6142-853: Was also the first car equipped with a six-cylinder engine, as well as four-wheel braking. Later used as a hill-climb racer, it is now an exhibit in the Louwman Museum (the former Nationaal Automobiel Museum) in the Hague , the Netherlands. Designs for four-wheel drive in America first came from the Twyford Motor Car Company . The Reynolds-Alberta Museum has a four-wheel-drive vehicle, named " Michigan ", from 1905 in unrestored storage. The first four-wheel-drive vehicles to go into mass production were built by (what became)
6225-431: Was demerged from BL in 1984 and privatized, later taken over by Ford in 1989, and was ultimately reunited with former BL stablemate Land Rover in 2000 to form what is now Jaguar Land Rover . Sales of Austin Rover products were reasonably strong, though not quite as high as the sales achieved by some of the earlier British Leyland products – the Maestro and Montego for instance did not sell as well as their predecessors,
6308-617: Was developed, and 1,700 RF-40-X-4(USA) trucks were produced in 1938, and 292 TF-40-X-4(USA) in 1939. Starting in 1936, Japanese company Tokyu Kurogane Kogyo built roughly 4,700 four-wheel-drive roadsters, called the Kurogane Type 95 reconnaissance car, used by the Imperial Japanese Army from 1937 until 1944, during the Second Sino-Japanese War . Three different bodystyles were manufactured –
6391-469: Was equipped and finished as a regular passenger automobile. In effect, it was the ancestor of the modern SUV . The luxury AMC or Buick V8 -powered Super Wagoneer produced from 1966 to 1969 raised the bar even higher. Jensen applied the Formula Ferguson (FF) full-time all-wheel-drive system to 318 units of their Jensen FF built from 1966 to 1971, marking the first time 4WD was used in
6474-631: Was less of a problem thanks to the follow-up of the Triumph Acclaim with the first generation Rover 200 of 1984 – the second product of the Honda alliance and one of the few strong-selling small family saloons of its era. So in effect, Austin Rover was selling around 100,000 cars of this size every year in Britain during the mid to late 1980s, regaining its share of the sector after the scaling-down of Austin Allegro production from 1980. The similarly sized Austin Maxi had already been discontinued in 1981 to allow
6557-443: Was relatively unchanged during its production through 1991, even after Chrysler 's buyout of AMC. Subaru introduced the category-expanding Leone in 1972, an inexpensive compact station wagon with a light-duty, part-time four-wheel-drive system that could not be engaged on dry pavement. In September, AMC introduced Quadra Trac full-time AWD for the 1973 model year Jeep Cherokee and Wagoneer. Due to full-time AWD, which relieved
6640-428: Was renamed " Rover Group ", and the truck and bus businesses were subsequently demerged and sold off to DAF and Volvo , respectively. The spare parts and logistics arm Unipart was also spun out in 1987. After an abortive attempt in 1988 to divest Land Rover to General Motors , the entire Rover Group was sold off by the British government in 1988 to British Aerospace . The car making subsidiary Austin Rover Group Ltd
6723-419: Was renamed "Rover Group Ltd", which saw the effective disappearance of the Austin Rover name and brand, even though the Austin badging had been removed from the Mini, Metro, Maestro and Montego models after 1987. By 1991, all Austin Rover dealer signage had been changed to the new claret and beige "Rover" branding, and use of the old blue and green "chevron" logo had ceased, although it made sporadic appearances on
6806-425: Was subsequently built. The development also incorporated Bramah's Pedrail wheel system in what was one of the first four-wheel drive automobiles to display an intentional ability to travel on challenging road surfaces. It stemmed from Bramagh's previous idea of developing an engine that would reduce the amount of damage to public roads. Ferdinand Porsche designed and built a four-wheel-driven electric vehicle for
6889-449: Was to curb the large amount of power that the trade unions had over the company. After discovering Robinson's links with various communist groups, the company amassed sufficient evidence claiming that his actions were intended to deliberately damage both BL itself and the UK economy. As a result of this, he was dismissed in 1979. Secondly, Edwardes began a ruthless programme of factory closures and sell-offs. The biggest casualties of this were
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