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Rear-engine, Rear-wheel Drive Layout
In automotive design, an RR, or rear-engine, rear-wheel-drive layout places both the engine and drive wheels at the rear of the vehicle. In contrast to the RMR layout, the center of mass of the engine is between the rear axle and the rear bumper. Although very common in transit buses and coaches due to the elimination of the drive shaft with low-floor buses, this layout has become increasingly rare in passenger cars. Overview Most of the traits of the RR configuration are shared with the mid-engine rear-wheel-drive, or MR. Placing the engine near the driven rear wheels allows for a physically smaller, lighter, less complex, and more efficient drivetrain, since there is no need for a driveshaft, and the differential can be integrated with the transmission, commonly referred to as a transaxle. The front-engine front-wheel-drive layout also has this advantage. Since the engine is typically the heaviest component of the car, putting it near the rear axle usually results ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brake Bias
The brake balance or brake bias of a vehicle is the distribution of brake force at the front and rear tires, and may be given as the percentage distributed to the front brakes (e.g. 52%) or as the ratio of front and rear percentages (e.g. 52/48). The braking balance affects the Vehicle dynamics, driving characteristics in terms of how fast the vehicle can brake, how the vehicle can take corners, and Tire maintenance, tire wear. The optimal brake balance can vary between circuits, weather conditions and driving styles. On race cars, the brake balance is often part of the racing setup, and in formula car racing it is regularly adjusted during the course of an entire lap. In some cases, the brake balance may be adjusted to match the Traction (engineering), traction (grip) of the vehicle during braking, which usually means distributing a greater braking force to the front (for example 55/45). In other cases, it may be desirable for the brake balance to be the more similar at the front and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porsche
Dr. Ing. h.c. F. Porsche AG, usually shortened to Porsche (; see below), is a German automobile manufacturer specializing in luxury, high-performance sports cars, SUVs and sedans, headquartered in Stuttgart, Baden-Württemberg, Germany. The company is owned by Volkswagen AG, a controlling stake of which is owned by Porsche Automobil Holding SE, usually shortened to Porsche SE. Porsche's current lineup includes the 718, 911, Panamera, Macan, Cayenne and Taycan. The origins of the company date to the 1930s when German Bohemian automotive engineer Ferdinand Porsche founded Porsche with Adolf Rosenberger, a keystone figure in the creation of German automotive manufacturer and Audi precursor Auto Union, and Austrian businessman Anton Piëch, who was, at the time, also Ferdinand Porsche's son in law. In its early days, it was contracted by the German government to create a vehicle for the masses, which later became the Volkswagen Beetle. After World War II, when Ferd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Cooling
file:KKP Auslauf.jpg, Cooling tower and water discharge of a nuclear power plant Water cooling is a method of heat removal from components and industrial equipment. Evaporative cooling using water is often more efficient than air cooling. Water is inexpensive and non-toxic; however, it can contain impurities and cause corrosion. Water cooling is commonly used for cooling automobile internal combustion engines and power stations. Water coolers utilising Convection (heat transfer), convective heat transfer are used inside high-end personal computers to lower the temperature of CPUs and other components. Other uses include the cooling of lubricant oil in pumps; for cooling purposes in heat exchangers; for cooling buildings in Heating, ventilation, and air conditioning, HVAC and in chillers. Mechanism Advantages Water is inexpensive, non-toxic, and available over most of the earth's surface. Liquid cooling offers higher thermal conductivity than air cooling. Water has unusually hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porsche 930
The Porsche 930 is a turbocharged variant of the 911 model sports car manufactured by German automobile manufacturer Porsche between 1975 and 1989. It was the maker's top-of-the-range 911 model for its entire production duration and, at the time of its introduction, was the fastest production car in Germany. Model history Porsche began experimenting with turbocharging technology on their race cars during the late 1960s, and in 1972 began development on a turbocharged version of the 911. Porsche originally needed to produce the car in order to comply with homologation regulations and had intended on marketing it as a street legal race vehicle like the 1973 Carrera 2.7 RS. The FIA's Appendix "J” rules upon which the 911 Turbo Carrera RSR 2.1 was entered into competition in 1974 changed in 1975 and 1976. The FIA announced that cars for Group 4 and Group 5 had to be production cars and be available for sale to individual purchasers through manufacturer dealer networks. For the 1976 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volkswagen Beetle
The Volkswagen Beetle, officially the Volkswagen Type 1, is a small family car produced by the German company Volkswagen from 1938 to 2003. One of the most iconic cars in automotive history, the Beetle is noted for its distinctive shape. Its production period of 65 years is the longest of any single generation of automobile, and its total production of over 21.5 million is the most of any car of a single car platform, platform. The Beetle was conceived in the early 1930s. The leader of Nazi Germany, Adolf Hitler, decided there was a need for a ''people's car''—an inexpensive, simple, mass-produced car—to serve Germany's new road network, the ''Reichsautobahn''. The German engineer Ferdinand Porsche and his design team began developing and designing the car in the early 1930s, but the fundamental design concept can be attributed to Béla Barényi in 1925, predating Porsche's claims by almost ten years. The result was the Volkswagen Type 1 and the introduction of the Volkswage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air-cooled
Air-cooled engines rely on the circulation of air directly over heat dissipation fins or hot areas of the engine to cool them in order to keep the engine within operating temperatures. Air-cooled designs are far simpler than their liquid-cooled counterparts, which require a separate radiator, coolant reservoir, piping and pumps. Air-cooled engines are widely seen in applications where weight or simplicity is the primary goal. Their simplicity makes them suited for uses in small applications like chainsaws and lawn mowers, as well as small generators and similar roles. These qualities also make them highly suitable for aviation use, where they are widely used in general aviation aircraft and as auxiliary power units on larger aircraft. Their simplicity, in particular, also makes them common on motorcycles. Introduction Most modern internal combustion engines are cooled by a closed circuit carrying liquid coolant through channels in the engine block and cylinder head. A fluid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R4 Layout
In automotive design, an R4, or rear-engine, four-wheel-drive layout places the engine at the rear of the vehicle, and drives all four roadwheels. This layout is typically chosen to improve the traction or the handling of existing vehicle designs using the rear-engine, rear-wheel-drive layout (RR). The R4 layout is very rare, only having been used on a small number of production vehicles. Notable vehicles with this layout include several high-performance Porsche sports cars, including the 959, the 911 Turbo since the introduction of the turbocharged version of the 993 series in 1995, and the 911 Carrera 4 introduced with the 964 series in 1989. Some Volkswagen Kübelwagen (the rear-engined beetle-based military vehicle used by Germany in World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by countr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M4 Layout
In automotive design, an M4, or Mid-engine, Four-wheel-drive layout places the internal combustion engine in the middle of the vehicle, between both axles and drives all four road wheels. It is a type of car powertrain layout. Although the term "mid-engine" can mean the engine is placed anywhere in the car such that the centre of gravity of the engine lies between the front and rear axles, it is usually used for sports cars and racing cars where the engine is behind the passenger compartment. The motive output is then sent down a shaft to a differential in the centre of the car, which in the case of an M4 layout, distributes power to both front and rear axles. The centre differential contained within many 4 wheel drive cars is similar to the conventional differential in a 2-wheel drive car. It allows torque to be distributed to both drive axles whilst allowing them to spin at different speeds, which vastly improves the cornering of a 4-wheel drive car on surfaces with high gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FR Layout
A front-engine, rear-wheel-drive layout (FR), also called Système Panhard is a powertrain layout with an engine in front and rear-wheel-drive, connected via a drive shaft. This arrangement, with the engine straddling the front axle, was the traditional automobile layout for most of the pre-1950s automotive mechanical projects. It is also used in trucks, pickups, and high-floor buses and school buses. Front mid-engine, rear-wheel-drive layout A front mid-engine, rear-wheel-drive layout (FMR) places the engine in the front half of the vehicle but ''behind'' the front axle, which likewise drives the rear wheels via a driveshaft. Shifting the engine's center of mass rearward aids in front/rear weight distribution and reduces the moment of inertia, both of which improve a vehicle's car handling, handling. FMR cars are often characterized by a long hood and front wheels that are pushed forward to the corners of the vehicle, close to the front bumper. 2+2 (car body style), 2+2-style ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dune Buggy
A dune buggy — also known as a beach buggy — is a recreational off-road vehicle with large wheels, and wide tires, designed for use on sand dunes, beaches, off-road or desert recreation. The design is usually a topless vehicle with a rear-mounted engine. A dune buggy can be created by modifying an existing vehicle or custom-building a new vehicle. Design Dune buggies are typically created by modifying an existing road vehicle, while sandrails are built from the ground up as a custom vehicle. Beetle-based buggies For dune buggies built on the chassis of a rear-engined existing vehicle, the Volkswagen Beetle has been most commonly used as the basis for the buggy, though conversions were made from other rear-engined cars (such as the Corvair and Renault Dauphine). The model is nicknamed Bug, lending partial inspiration to the term "buggy." The Beetle platform chassis was used because the rear engine layout improves traction, the air-cooled engine avoids the complexi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Understeer
Understeer and oversteer are vehicle dynamics terms used to describe the sensitivity of the vehicle to changes in steering angle associated with changes in lateral acceleration. This sensitivity is defined for a level road for a given steady state operating condition by the Society of Automotive Engineers (SAE) in document J670SAE International Surface Vehicle Recommended Practice, "Vehicle Dynamics Terminology", SAE Standard J670, Rev. 2008-01-24 and by the International Organization for Standardization The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. M ... (ISO) in document 8855.International Organization for Standardization, "Road vehicles – Vehicle dynamics and road-holding ability – Vocabulary", ISO Standard 8855, Rev. 2010 Whether the vehicle is understeer or overst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
