Patents Assigned to Piaggio & C. S.p.A.
  • Patent number: 4928555
    Abstract: In order to provide an automatic transmission for vehicles, having a wide range of transmission ratio, a first transmission unit is provided, with a transmission ratio variable with continuity, connected on its inlet side with a driving shaft, and at least a second transmission unit and a third transmission unit are provided, each with a fixed transmsision ratio, which is different from each other, with each of them being connected, on its inlet side, with said first transmission unit, and on its outlet side, with a driven shaft of the vehicle, which they supply with motion, alternatively to each other; the second transmission unit and the third transmission unit are connected with the first transmission unit by means of two respective automatic couplings, which engage at different actuation speeds.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: May 29, 1990
    Assignee: Piaggio & C. S.p.A.
    Inventor: Marco Nuti
  • Patent number: 4916978
    Abstract: The device comprises first and second planet wheels having a common axis, first and second pairs of first satellite gear wheels meshing respectively with the first and second planet wheels, the two gear wheels of each of the said pairs being rotatable on a differential housing coaxial with the planet wheels and having axes lying respectively in first and second planes orthogonal to one another and passing through the first-mentioned said common axis; the device further includes two pairs of second satellite gear wheels also rotatable on the differential housing and having axes lying in the same plane orthogonal to the first and second first-defined planes, each of the second satellite gear wheels meshing simultaneously with one of the said first satellite gear wheels belonging to the first pair and with one of the said first satellite gear wheels belonging to the second pair in such a way that drive can be transmitted from one of the said first satellite gear wheels of one of the said pairs simultaneously to
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: April 17, 1990
    Assignees: Ferrari Engineering S.p.A., Piaggio & C. S.p.A.
    Inventors: Giovanni B. Razelli, Piero Buoncristiani
  • Patent number: 4850455
    Abstract: A braking system for two-wheelers is provided with a normal-duty actuation member which acts on both a front braking assembly and a rear braking assembly, and with an emergency actuation member which acts on one only of said braking assemblies; means are provided for balancing the actuation force applied by the normal-duty actuation member and the actuation force applied by the emergency actuation member on the common braking assembly, which enable the greater of the two braking actions to be applied as the braking action, for the purpose of preventing the jamming, and hence the skidding of the vehicle wheel on which such common braking assembly acts.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: July 25, 1989
    Assignee: Piaggio & C. S.p.A.
    Inventor: Marco Nuti
  • Patent number: 4829967
    Abstract: In a two-stroke internal combustion engine, with fuel injection and controlled ignition, a valve is provided, which allows or prevents the inflow of fuel into the combustion chamber; such a valve is driven by an electromagnet controlled by a control unit as a function of the engine operating parameter.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: May 16, 1989
    Assignee: Piaggio & C. S.p.A.
    Inventor: Marco Nuti
  • Patent number: 4829972
    Abstract: In a magnet-flywheel, capacitive-discharge ignition unit, for internal combustion engines, besides a high-impedance winding intended for feeding the capacitor connected to the primary winding of the ignition coil, also a low-impedence winding is provided, which is connected to the primary winding, and has the task of prolonging the ignition discharge.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: May 16, 1989
    Assignee: Piaggio & C. S.p.A.
    Inventor: Giacomo Montano
  • Patent number: 4817749
    Abstract: Motor scooter comprising a monocoque body in which at least a receptacle, suitable to house at least one crash helmet is provided.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: April 4, 1989
    Assignee: Piaggio & C. S.p.A.
    Inventor: Giacomo Montano
  • Patent number: 4813921
    Abstract: A transmission unit for self-propelled vehicles, comprising two pulleys, i.e., a driving pulley and a driven pulley, with variable pitch, connected to each other by a transmission belt, is provided with an engine start-up device with an actuation group acting downstream the driven pulley; such an actuation group causes, at start-up time, the jockey element to act on the transmission belt, for the purpose of recovering possible slack of the belt; furthermore, lock elements, disengageable by centrifugal force, are provided, which mutually constrain, at start-up time, the two half-pulleys which compose the driven pulley, for the purpose of preventing the belts from wedging themselves between the same half-pulley.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: March 21, 1989
    Assignee: Piaggio & C. S.p.A.
    Inventor: Aldo Dianda
  • Patent number: 4773573
    Abstract: For securing side boxes to the frame of a motor-scooter or similar vehicle, a hand operated mechanism is provided, which consists of a rod (14) having a handle-shaped end (19) and a crank-like bent portion (20) coooperating with an eccentrically mounted connecting rod (26) having a hooked end (23) adapted to seize a corresponding interlocking member (24) secured to the side box (12). The rod (14) is mounted generally vertically in the interior of the scooter's body (13) and the rod handle (19) is positioned in a space which can be closed by a lock and a key to prevent unauthorized manipulations.
    Type: Grant
    Filed: August 3, 1982
    Date of Patent: September 27, 1988
    Assignee: Piaggio & C. S.p.A.
    Inventor: Carlo Doveri
  • Patent number: 4637277
    Abstract: This invention relates to an improvement in devices for controlling the transmission ratio variation in continuous variators disposed between a vehicle engine and its wheels. The improvement comprises a supplementary control which modifies that action on the device which is dependent on the engine feed, in particular to obtain effective engine braking action during vehicle deceleration.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: January 20, 1987
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi
  • Patent number: 4612891
    Abstract: An automatic governor device for automatically governing the delivery of an injection pump of a Diesel engine, in particular of the single cylinder type for use in motor vehicles, comprising a centrifugal mass governor with a spring for governing the delivery supplement at the starting stage, a spring for governing the idle rate of the engine, and a spring for governing the rates of higher values. Said device comprises a component capable of a holding the governor in its position of control of the highest delivery of the pump at a starting rate of the engine, higher than the idle rate, and of practically ceasing its influence on the govering action, in particular in the idle rate range, as soon as said starting rate has been reached.
    Type: Grant
    Filed: December 19, 1984
    Date of Patent: September 23, 1986
    Assignee: Piaggio & C. S.p.A.
    Inventor: Carlo Doveri
  • Patent number: 4608953
    Abstract: A speed-limiting device of the electronic ignition type for the internal combustion engine of a motor vehicle is equipped with an AC generator driven to rotation by the engine, such a generator comprising a feeding coil for the electronic ignition circuitry and a pickup winding for controlling the sparking of the engine spark plugs is characterized in that the signal of said control of the sparking for the igniting spark is cut off by short-circuiting to ground the pickup winding via a diode which is governed by the voltage generated by said feeding coil of the ignition circuitry, a voltage which is appropriately processed by a specially provided electric circuitry so as to become proportional to the generator speed as the voltage in question overtakes a threshold magnitude as preset by a specially provided sensing member.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: September 2, 1986
    Assignee: Piaggio & C. S.p.A.
    Inventor: Livio Benvenuti
  • Patent number: 4589858
    Abstract: This invention relates to a variable ratio transmission system suitable for vehicles in which the speed regulator is mounted on the transmission driven shaft, and the relationship governing its response to the speed variation of the driven shaft is such as to induce a transmission ratio variation to predetermine the speed of the system input shaft, which is intended for connection to the drive shaft. Means are also provided for connection to engine regulator means, in order to determine the constant speed of the system input shaft as a function of the torque applied to the transmission input shaft.
    Type: Grant
    Filed: March 6, 1984
    Date of Patent: May 20, 1986
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi
  • Patent number: 4585430
    Abstract: In a variable-transmission-ratio mechanical drive of the continuous variation type having a V-belt and expansible sheaves, in which each sheave has a fixed half-sheave and a movable half-sheave the position of only one of the movable sheaves is determined as a function of the speed and the load of the engine by an automatic positioning servomechanism, whereas the other movable half-sheave is subjected only to the axial load of a member which is adapted to cause the belt to adhere to said expansible sheaves.
    Type: Grant
    Filed: March 6, 1984
    Date of Patent: April 29, 1986
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi
  • Patent number: 4523660
    Abstract: A bearing body for motorcycles with rear drive wheel borne in cantilever fashion by an oscillating arm fulcrummed to said body and bearing also the engine/transmission assembly with related exhaust pipe silencer, comprising in its lower part anterior to the fulcrum of said oscillating arm a cavity for free partial housing of said silencer.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: June 18, 1985
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi
  • Patent number: 4521208
    Abstract: A tension-adjusting assembly for driving belts, such as driving belts for controlling the timing shaft of internal combustion engines, includes a device for neutralizing the effects of the variations of the distance between the axes of the pulleys, as caused by thermal expansions of the supports for the pulley journals.
    Type: Grant
    Filed: July 20, 1982
    Date of Patent: June 4, 1985
    Assignee: Piaggio & C. S.p.A.
    Inventor: Carlo Doveri
  • Patent number: 4488618
    Abstract: A bearing body for motorscooter, comprising lateral cowls formed solidly therewith, also comprising releasable restraining means for securing a spare wheel to the side of the body within one of said cowls, there being also a lockable aperture, proximal to said securing means, inside said cowl.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: December 18, 1984
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi
  • Patent number: 4433473
    Abstract: A method is disclosed for manufacturing a flywheel magneto of the radial magnetic flux type for motor bicycles, motor scooters and the like, which comprises the steps of forming a sub-assembly comprised of a ring, the magnets, the pole shoes by scotching said ring on a plurality of wedges placed around a cylindrical body whereafter the pole shoes and an inner ring of a metallic nonmagnetic material are positioned and a punch rams all these component parts forcibly together. Finally, the sub-assembly so composed is surrounded by a casting of a nonmagnetic material.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: February 28, 1984
    Assignee: Piaggio & C. S.p.A.
    Inventor: Carlo Benedetti
  • Patent number: 4352343
    Abstract: The invention relates to an improvement in a two-stroke internal combustion engine with opposed cylinders of different diameters which communicate by way of a combustion chamber of bell configuration for radially stratifying the rich mixture charge fed tangentially into the minor cylinder and the air charge fed into the major cylinder.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: October 5, 1982
    Assignee: Piaggio & C. S.p.A.
    Inventor: Giovanni Batoni
  • Patent number: 4191156
    Abstract: In a two-stroke, water-cooled internal combustion engine the improvement is disclosed which permits to have a removable cylinder liner type of engine in spite of the intricate constructional arrangement of such engines having transfer ports and exhaust ports. The improvement consists in that the transfer and exhaust ports are formed through the liners and flanged fittings are provided between the liner transfer ports and the transfer ducts so as to ensure complete tightness. Differential-firmness gaskets are provided where appropriate and the engine is then assembled by stay bolts as usual. The construction suggested by the invention not only solves the tightness problem satisfactorily, but minimizes the stresses on the liners, especially the bending stresses.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: March 4, 1980
    Assignee: Piaggio & C. S.p.A.
    Inventor: Carlo Doveri
  • Patent number: D270436
    Type: Grant
    Filed: November 3, 1981
    Date of Patent: September 6, 1983
    Assignee: Piaggio & C. S.p.A.
    Inventor: Bruno Gaddi