Abstract: An assembly for a power plant for a motor vehicle which includes longitudinally, from front to rear, a thermal engine and a transmission wherein the rear side of a longitudinal block of the thermal engine is rigidly connected to the front side of a housing of the transmission, especially a housing for a flywheel, that includes, to the right of a plane of attachment of an oil pan beneath the block of the engine, two horizontal right angle members, facing one another transversely, each one including a longitudinal front first arm secured rigidly to the engine block, and a second transverse rear arm secured rigidly to the housing in order to strengthen the assembly of the engine and of the transmission. The assembly includes a separation piece which is inserted vertically between the engine block and the oil pan, and on which the first forward arms of the two right angles are rigidly attached.

Abstract: Specific parameters of each of the injectors of the injection device of a combustion engine, especially a device with pre-injection with electronic control of a diesel engine, are determined. The curve of the instantaneous speed difference (DVi) of the engine shaft between the time of transition to the combustion top dead center point of the cylinder in question and a subsequent time preceding the transition to the combustion top dead center point of the following cylinder is established as a function of the value of the parameter to be determined, the other parameters of functioning being kept constant. The optimum value of the parameter is determined which corresponds to an extremum of the curve.

Abstract: A device for controlling the circulation of a fluid through a fluid bypass (3) consists of an actuator (14) which is actuated pneumatically and directly by the fluid located in the bypass so as to close, at least partially, bypass outlet (3c) when the pressure of the fluid in the bypass is higher than a predetermined pressure threshold (PO).

Abstract: A vehicle steering knuckle includes a body, a knuckle shaft for supporting a wheel and extending from the body, and a yoke having upper and lower legs extending from the body in a direction opposite the knuckle shaft. The upper leg of the yoke includes a fastening flange separate from the main body, the fastening flange including a bore through which a pivot pin can pass. Bolts releasably fasten the fastening flange to the body. A head end of an axle can fit between the upper and lower legs and a pivot pin can be inserted through the yoke and the axle to form a knuckle joint. The fastening flange can be released from the body to gain access to a portion of the knuckle joint by releasing the bolts.

Abstract: A device for suspension of a driver's cab (2) in relation to chassis (1) of a motor vehicle includes four hydraulic cylinders (5a-5d), each consisting of a hollow body connected to the chassis. A piston (9) slides axially in each body and delimits an upper chamber (10) and a lower chamber (11) therein. Each piston is integral with a first rod (12) connected to the cab and with a second rod (13) connected to the chassis. Ducts (17a-17d) are filled with virtually incompressible fluid and connect the upper chamber of a given cylinder to the lower chamber of the cylinder which is diagonally opposite thereto.

Abstract: A hub 1 integral with the injection pump to include a housing 2 driven in rotation, surrounding hub 1 and including two rollers 4, 5 placed parallel to the axis of the housing at a distance from this axis. An eccentric governor weight 15 is mounted on hub 1 to be able to move in one direction under the action of the centrifugal force. Two advance control pistons 8, 9 with axis orthogonal to the axes of the hub are mounted in the hub, each to be able to slide in a recessed bore and each equipped with a lateral support ramp 10, 11 able to work with one of the rollers 4, 5 to cause an angular offset between hub 1 and housing 2. One of the pistons 8 acts in the other direction on governor weight 15 by a spring 18. A hydraulic circuit goes through the hub and has a distributor with controlled relief 20 adjusting the pressure acting on pistons 8, 9 as a function of the position of governor weight 15.

Abstract: A detection process and device for electronic injection control of a multicylinder engine of an automobile engine, which performs the functions of measuring the speed of rotation of the engine, pinpointing the angular position of the top dead center of each cylinder of the engine, and identifying at any time which one of the cylinders for which the injection of fuel is to take place. The device includes a multipolar ring provided with multiple north and south magnetic poles distributed alternately on the circumference of the ring; a pair of sensors sensitive to the magnetic field produced by the multipolar ring mounted facing the ring and spaced angularly from one another; and an electronic processing interface connected to the sensors to deliver signals to a computer for control of the electronic injection of the engine.

Abstract: A detection device, for an injection pump of a motor vehicle engine, for measuring the speed of rotation of the engine, pinpointing angularly the top dead center corresponding to each cylinder of the engine and performing static timing of the injection pump. The device includes a multipolar ring of alternate polarity mounted on the rotation shaft of the pump inside the latter, the poles being grouped in a number of identical sectors corresponding to the number of cylinders of the engine; a sensor sensitive to magnetic field, mounted inside the pump opposite the ring; and an electronic processing interface connected, on the other hand, to the sensor, and on the other hand, to a computer for control of the electronic injection. The multipolar ring produces a varying magnetic field which is sensed by the sensor, and waveshaped and converted into a digital signal for application to a computer for control of electronic injection.

Abstract: A pneumatic control device for a vehicle clutch has at least one clutch disk and includes a pneumatic cylinder operatively connected to the clutch disk operating the clutch disk as a function of pneumatic pressure applied to the cylinder. A displacement sensor measures an amount of travel of the clutch pedal and emits a signal based thereupon. An electronic package responsive to the signal from the displacement sensor outputs a control signal which follows a predetermined law as a function of the signal from the displacement sensor. A pneumatic circuit is connected to the pneumatic cylinder for supplying the pneumatic pressure thereto, the pneumatic circuit including an electropneumatic modulator which receives the control signal and outputs a pneumatic pressure as a function of the control signal.

Abstract: A suspension for a vehicle having tandem axles includes a composite leaf spring connected between the axles. The leaf spring is constrained to bend about a transverse axis by a fixed elastic support having a concave, arcuate bottom surface whose center coincides with the transverse axis. The elastic support engages the top surface of the leaf spring at two points on opposite sides of the transverse axis, and is opposed by a central elastic element. The ends of the leaf spring are connected to the tandem axles by ball joints having elastic pads.

Abstract: A device designed to actuate the positive clutches of gearbox sliding gears following synchronization of the respective pairs of gears. A cylinder mechanism is provided on each sliding plate of the gearbox, as well as solenoid valves which are controlled by an electronic calculator to select and actuate the cylinders. Each cylinder mechanism includes two oppositely acting pistons, each connected to the sliding plate, and each sliding in its own cylinder which also includes a return spring which operates against each piston and which practically eliminates the clearance above the piston as the piston is about to be acutated.

Abstract: A pneumatic boost device includes a booster input including a manually actuatable upstream pusher and a downstream pusher positioned such that the movement of the upstream pusher towards the piston causes the upstream pusher to contact and move the downstream pusher toward the piston. A compressed gas is supplied to the cylinder such that the piston is moved in a direction away from the booster input by a system including a gas flow path having a first check valve, the first check valve being seatable on a seat moving with the downstream pusher. Movement of the downstream pusher thus applies a gas pressure to the piston which moves by an amount corresponding to that of the upstream pusher. The downstream pusher has a piston in the additional cylinder. Another gas flow path has a second check valve, the second check valve being seatable on a seat moving with the upstream pusher by movement of the upstream pusher toward the piston.

Abstract: A male part such as a needle valve (1) is guided in a bore such as that of a nozzle (2) in a manner such that male part exhibits a passage function of a pressurized fluid (1A) and the bore works with a volume (3, 6) subjected to the effect of the pressure.

Abstract: Mechanical transmission manual control device includes a gear control lever (1) which is hinged around a shifting ball (11) to operate a main control connecting rod (2). A lever (12) is solid with the main control connecting rod (2) which operates a transmission control connector (4) carrying a selector (7), the lever (12) working, for selection of the gears, with a reaction link (3) which is connected by its other end (13) to a stationary element (8). There is also provided an element for modification of one of the elements of the kinematic chain which are placed between the knob (14) of the gear control lever (1) and the selector (7), i.e., the control lever (1), the main control connecting rod (2), the reaction link (3), and the control connector (4) to modify the relative position of the knob (14) and the selector (7) in relation to one another.

Abstract: A device designed to actuate the positive clutches of gearbox sliding gears following synchronization of the respective pairs of gears. A cylinder mechanism is provided on each sliding plate of the gearbox, as well as solenoid valves which are controlled by an electronic calculator to select and actuate the cylinders. Each cylinder mechanism includes two oppositely acting pistons, each connected to the sliding plate, and each sliding in its own cylinder which also includes a return spring which operates against each piston and which practically eliminates the clearance above the piston as the piston is about to be actuated.

Abstract: A device for the electronic control of an actuator, particularly for transmission dog clutches. The actuator is controlled by two double-acting cylinders, a translation cylinder and a rotation cylinder. Each of the cylinders is associated therewith a system for noting the position of each cylinder, a control system that provides a digital signal representative of the desired position of each cylinder, a digital comparator for producing an error signal as a difference between the desired position and then the actual position, and a digital regulator of the proportional and derivative type which produces an instruction signal to change corresponding solenoid valve. A microprocessor acts with the digital regulator to produce internal storage and programs.

Abstract: A friction-based device for partial locking of a motor vehicle differential with at least one elastic friction segment between one or more sun gears of the differential and the crown gear driving the vehicle wheels, the at least one elastic segment contained under compression in a hole bored on the differential housing, the segment exerting radial pressure on the inside surface of the hole.This arrangement is particularly suitable for partial locking of the motor differential(s) for heavy road vehicles.

Abstract: Engine brake clutch device comprising a common system of the electric machine type for transformation of mechanical energy associated with a differential system (27) and with a clutch (28), the unit being placed between the engine and the transmission so as to be able to perform the clutching or the engine braking of the vehicle.

Abstract: Device for controlling transmission dog clutches, has a single actuator (1) having at least one control pin (2, 3) which cooperates with control forks (4) having two positions, one of these positions corresponding to a clutching and the other position corresponding to a declutching. The actuator (1) can translate or rotate.

Abstract: Axle-chassis connecting device is particularly for a commercial vehicle having two tandem axles of the hydropneumatic suspension type. The vertical load coming from the chassis is transmitted directly to the wheels by jacks (23) without passing through the axle tanks, and is taken into account near the wheel plane by means of a multifunction part (20) which further assures, simultaneously, the connection of the axle to the chassis by a longitudinal guide rod (26) and the transmission of the braking torques coming from the braking means (35).