The Ducati Pantah is an Italian motorcycle with a 90° V-twin engine, produced between 1980 and 1986.
20-469: Unlike its predecessors which were bevel-gear OHC designs, the Pantah was the first Ducati to have belt-driven camshaft motors, thus forming the vanguard of the new generation of current Ducati V-twins. First shown December 1979, the Pantah came on the market as the 1980 500SL and the last of the line, the 650SL, was sold in 1986. Successful in racing as the 600 cc TT2 and later TT1 750 cc racer,
40-428: A face gear or a contrate gear ) is a gear which has teeth that project at right angles to the face of the wheel. In particular, a crown gear is a type of bevel gear where the pitch cone angle is 90 degrees. A pitch cone of any other angle is simply called a bevel gear. Crown gears normally mesh with other bevel gears, or sometimes spur gears , a typical use being a crown gear and pinion system which allows
60-420: A gear is the imaginary toothless surface that you would have by averaging out the peaks and valleys of the individual teeth. The pitch surface of an ordinary gear is the shape of a cylinder. The pitch angle of a gear is the angle between the face of the pitch surface and the axis. The most familiar kinds of bevel gears have pitch angles of less than 90 degrees and therefore are cone-shaped. This type of bevel gear
80-421: A plain bearing crankshaft and the same bore and stroke as the old 500 racer, 74 mm x 58 mm, but the head had a 60 degree included valve angle. The engines were noticeably lacking in bottom-end and mid-range torque, but they revved freely enough. The suspension seemed less precise than earlier Ducati models, and the 35 mm front forks lacked rigidity. Some riders found the final gearing too tall, and
100-402: A triangle wave projected on the circumference of a circle), whereas the bevel gear tooth profile is an octoid (i.e. a triangle wave projected on the normal path of a circle of a sphere). All traditional bevel gear generators (such as Gleason , Klingelnberg, Heidenreich & Harbeck, WMW Modul) manufacture bevel gears with an octoidal tooth profile. IMPORTANT: For 5-axis milled bevel gear sets it
120-583: Is called external because the gear teeth point outward. The pitch surfaces of meshed external bevel gears are coaxial with the gear shafts; the apexes of the two surfaces are at the point of intersection of the shaft axes. The use of a genuine bevel gear has even greater importance for the reliability of the axle than any other spare part. Bevel gears that have pitch angles of greater than ninety degrees have teeth that point inward and are called internal bevel gears. Bevel gears that have pitch angles of exactly 90 degrees have teeth that point outward parallel with
140-465: Is important to choose the same calculation / layout like the conventional manufacturing method. Simplified calculated bevel gears on the basis of an equivalent cylindrical gear in normal section with an involute tooth form show a deviant tooth form with reduced tooth strength by 10-28% without offset and 45% with offset [Diss. Hünecke, TU Dresden]. Furthermore, those "involute bevel gear sets" cause more noise. There are two issues regarding tooth shape. One
160-400: Is the cross-sectional profile of the individual tooth. The other is the line or curve on which the tooth is set on the face of the gear: in other words the line or curve along which the cross-sectional profile is projected to form the actual three-dimensional shape of the tooth. The primary effect of both the cross-sectional profile and the tooth line or curve is on the smoothness of operation of
180-570: The "received wisdom", a twin-cylinder biker can compete successfully against the fours. The Pantah was first shown at the Milan Bike Show in December 1979. The prototype was different again to Ducati's earlier bikes: it had a trellis frame, with the suspended motor acting as a stressed member , and the swingarm pivoted on the rear of the crankcase . The single overhead camshaft was driven by toothed rubber belt and primary transmission
200-497: The 1982 600TL proved unpopular, and the model lasted only until 1983. In 1983 the 650SL was produced to homologate the TT1 750 racer's 61.5 mm stroke. Instead of producing a production 750, the 650SL was born with 82 mm bore and the required 61.5 mm stroke. bodywork is virtually identical to the 600 but was painted red and yellow, had a different instrument layout and some other minor changes, but it had more torque, and that
220-470: The Pantah was a lighter, shorter wheelbase motorcycle, in a new trellis frame that was to become a trademark Ducati feature. When Ducati's 1976 350 cc and 500 cc parallel twins proved to be a marketing failure, Fabio Taglioni went to work developing the a replacement. The Pantah 500 was developed from the last of the GP500 racers of 1973, the Pantah and its successors have shown that, contrary to
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#1732787407629240-522: The axes of the two shafts intersect and the tooth -bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. The pitch surface of bevel gears is a cone , known as a pitch cone . Bevel gears change the axis of rotation of rotational power delivery and are widely used in mechanical settings. Two important concepts in gearing are pitch surface and pitch angle . The pitch surface of
260-481: The axis and resemble the points on a crown, whence the name crown gear . Mitre gears are a special case of bevel gears that have equal numbers of teeth. The shafts are positioned at right angles from each other, and the gears have matching pitch surfaces and angles, with a conically-shaped pitch surface. Mitre gears are useful for transmitting rotational motion at a 90-degree angle with a 1:1 ratio. The cylindrical gear tooth profile corresponds to an involute (i.e.
280-410: The corresponding tooth and simply curving the gear teeth can solve the problem. Spiral bevel gears have their teeth formed along spiral lines. They are somewhat analogous to cylindrical type helical gears in that the teeth are angled; however, with spiral gears, the teeth are also curved. The advantage of the spiral tooth over the straight tooth is that they engage more gradually. The contact between
300-451: The gears. Some result in a smoother gear action than others. The teeth on bevel gears can be straight, spiral or "zerol". In straight bevel gears , the teeth are straight and parallel to the generators of the cone. This is the simplest form of bevel gear. It resembles a spur gear, only conical rather than cylindrical. The gears in the floodgate picture are straight bevel gears. In straight bevel gear sets, when each tooth engages, it impacts
320-417: The intake and exhaust restrictive; but when these were changed for higher flow items with lowered gearing, it gave a performance increase. The 1981 600SL had a fairing and hydraulic clutch activation. It had an 80 mm bore and the 58 mm stroke giving 583 cc, whereas the first Pantah based racer, the 600 cc TT2 racer used 81 mm) The last of the 600SL bikes had MHR paint. The styling of
340-479: The intent of duplicating the characteristics of a straight bevel gear, but they are produced using a spiral bevel cutting process. The bevel gear has many diverse applications such as locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, railway track inspection machines, etc. For examples, see the following articles on: How Bevel Gears Work on YouTube Crown gear A crown gear (also known as
360-689: The teeth starts at one end of the gear and then spreads across the whole tooth. This results in a less abrupt transfer of force when a new pair of teeth come into play. With straight bevel gears, the abrupt tooth engagement causes more noise, especially at high speeds, and impact stress on the teeth which makes them unable to take heavy loads at high speeds without breaking. For these reasons, straight bevel gears are generally limited to use at linear speeds less than 1000 feet/min; or, for small gears, under 1000 rpm. Zerol bevel gears are an intermediate type between straight and spiral bevel gears. Their teeth are curved, but not angled. Zerol bevel gears are designed with
380-544: Was a big improvement and was considered by many as THE Pantah. The 650SL produced 63 hp at 8,500 rpm. Cagiva took over Ducati Meccanica in 1985, and Ducati engines promptly appeared in Cagiva-badged motorcycles. The 650SL continued to be produced after the Cagiva take-over, and ended production in 1986. The Cagiva Alazzurra was a revamped Ducati Pantah. Bevel gear Bevel gears are gears where
400-438: Was via Morse chain . The front disc brake was a Campagnolo Hydroconico. The Pantah's performance was impressive: 500 cc, 50 hp (36.5 kW) @ 8500 rpm, 180 kg, 1450 mm of wheelbase, significantly better from the earlier bevel-head V twins which were too long, bulky and stable for racing. The Pantah's performance easily surpassed that of the ill-conceived 1976 parallel twins. The 1980 Pantah 500SL had
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