Abstract: A transmission between a driving primary shaft and an outlet shaft of a self-propelled machine, includes a housing within which there are housed, at least in part: a stepdown mechanism; two clutch mechanisms, one being progressive and the other being non-progressive with a movable dog; and a clutch control device including first and second clutch control elements. The second clutch control elements include at least one spring blade extending along the outlet shaft, the spring blade being mounted to move axially on the outlet shaft during axial movement of the dog from the unclutched extreme position towards a clutched position as a result of the movable dog bearing thereagainst, the spring blade being drivable axially on the shaft and being elastically deformable between an active position in which the dog comes into abutment against the spring blade, and an inactive position in which the dog slides along the spring blade.

Abstract: Transmission mechanism housing (1) of the type including two half-shells (1A, 1B) that can be assembled generally via a parting line, this housing (1) accommodating at least one control member (2) moved angularly with the aid of a lever (3) outside the housing (1), the lever (3) including a sleeve (4) that can be inserted removably into a receiving bearing (5) of the housing (1), the sleeve (4) being capable, in the state in which it is inserted into the receiving bearing (5), of being held in at least one predetermined axial position by locking elements (6A, 6B). The locking elements (6A, 6B) are configured in order to travel from the locked position to the unlocked position, and vice versa, by simple relative rotary movement of the sleeve (4) and of the bearing (5) about the longitudinal axis of the sleeve (4).

Abstract: A direction-reversing device includes at least one input shaft, an output shaft, and direction-reversing element with a clutch sleeve including a moving clutch sleeve, mounted to move axially on one of the shafts carrying it to enable occupying forward and reverse positions. This device also includes a blocking element that is driven in rotation by the input shaft that carries the moving clutch sleeve, whereby this blocking element is mounted to move between the off position, in which the moving clutch sleeve is able to switch from one operating position to the next, and the on position, in which the blocking element forms an obstacle that prevents the switching of the moving clutch sleeve from one position to the next, being able to switch automatically from the off position to the on position when the input shaft is driven at a speed of rotation that exceeds a predetermined threshold value.

Abstract: Transmission device between an input drive shaft and an output shaft, of the type including a housing inside which are placed at least partially a reduction gear mechanism and a progressive cone clutch mechanism, the reduction gear mechanism including a driving member engaged with a driven member, formed by a gearwheel mounted so as to rotate freely on the output shaft and able to be coupled to/uncoupled from the output shaft via two friction cones of the clutch mechanism, the cones being placed coaxial to the axial bore of the gearwheel and capable of coming, under the action of a control device, into bearing contact with a conical bearing surface of the gearwheel. The conical bearing surfaces of the gearwheel are, relative to the axis of rotation of the gearwheel, offset axially from the gear teeth of the gearwheel and are placed on the same side of the gear teeth.

Abstract: A transmission device for an automotive vehicle of the type includes, mounted on an output shaft formed by at least two wheel drive half-shafts of a vehicle mounted to freely rotate one relative to the other, at least one rotary gearwheel, and two clutch mechanisms with clutch sleeves arranged on both sides of the gearwheel. This device includes, on the one hand, two clutch sleeve configurations: the driving configuration of the gearwheel, and the engine brake configuration of the gearwheel, and, on the other hand, a declutching control mechanism that includes at least one clutch sleeve pilot unit, coaxial to the gearwheel, mounted relative to the gearwheel that moves angularly between two end positions. The declutching pilot unit can be driven into each of the end positions by the two wheel drive half-shafts when they are driven at a speed of rotation that is different from that of the gearwheel.

Abstract: A variable-speed drive unit, in particular for a variable-speed drive device, such as a riding mower, includes at least one belt transmission between two pulleys, each mounted on a shaft, each pulley including variably-spaced flanges. In this variable-speed drive unit, each pulley has a flange that equipped with a loading device that tends to exert, in a permanent manner and in the active state of the transmission, an axial effort in the direction in which the flanges move toward the pulley to clamp the belt between the flanges, whereby one of the pulleys has a loading device that exerts a lesser axial effort than the other device, and whereby one of the pulleys also includes, independently of the loading device, a manual control element for drawing together or separating flanges that can exert on the flange a slight control effort corresponding essentially to the power difference of the loading devices.

Abstract: A device for braking an elongated rotating body, includes at least two parts with coaxial conical surfaces, able to be slipped onto the body, and one, a so-called male cone, mounted integrally in rotation with the body, and the other, a so-called female cone, mounted fixed in rotation relative to the body. The female cone assumes the shape of a wheel with an axial bore with a conical bearing, and the male cone has a center recess. The cones are controlled in terms of axial relative movement by a control element. The male cone is, when the cones are close to one another, corresponding to the braking position, housed inside the axial bore of the female cone, with its conical external peripheral surface being held, by contact with a support, with the conical bearing of the female cone.

Abstract: A transmission between a driving primary shaft and an outlet shaft of a self-propelled machine, includes a housing within which there are housed, at least in part: a stepdown mechanism; two clutch mechanisms, one being progressive and the other being non-progressive with a movable dog; and a clutch control device including first and second clutch control elements. The second clutch control elements include at least one spring blade extending along the outlet shaft, the spring blade being mounted to move axially on the outlet shaft during axial movement of the dog from the unclutched extreme position towards a clutched position as a result of the movable dog bearing thereagainst, the spring blade being drivable axially on the shaft and being elastically deformable between an active position in which the dog comes into abutment against the spring blade, and an inactive position in which the dog slides along the spring blade.

Abstract: A system for a self-propelled vehicle with variable travel speed, such as a mowing tractor, includes, between the primary driving shaft of the vehicle and an output shaft, such as the wheel drive shaft of the vehicle, at least one controlled variable speed drive with a belt and controlled mechanism for reversing the direction of travel of the vehicle, the primary driving shaft transmitting, via the variable speed drive, its motion to the input shaft of the reversal mechanism, itself able to directly or indirectly engage the output shaft, such as the wheel drive shaft of the vehicle, in such a way as to allow the vehicle to travel forward or in reverse respectively, at a variable travel speed. This transmission system is characterized in that the variable speed drive and the mechanism for reversing the direction of travel of the vehicle are controlled selectively from the same control device.

Abstract: Transmission device for self-propelled equipment, includes a housing having a driving input shaft transmitting movement to an output shaft, the input shaft bearing a receiving pulley around which pulley a belt transmission is wrapped. The input shaft also bears a component that rotates as one with the shaft and a member for controlling the movement of the pulley along the input shaft in terms of the pulley movement towards or away from the component so that the pulley, which is mounted with freedom to rotate on the input shaft, can be moved from a disengaged position when it is away from the component, into an engaged position when it is close to the component, the pulley having a groove of constant predetermined width for accepting the belt so that when the belt is taut inside the groove, the belt tension is maintained as the pulley moves along the input shaft.

Abstract: Transmission mechanism housing (1) of the type including two half-shells (1A, 1B) that can be assembled generally via a parting line, this housing (1) accommodating at least one control member (2) moved angularly with the aid of a lever (3) outside the housing (1), the lever (3) including a sleeve (4) that can be inserted removably into a receiving bearing (5) of the housing (1), the sleeve (4) being capable, in the state in which it is inserted into the receiving bearing (5), of being held in at least one predetermined axial position by locking elements (6A, 6B). The locking elements (6A, 6B) are configured in order to travel from the locked position to the unlocked position, and vice versa, by simple relative rotary movement of the sleeve (4) and of the bearing (5) about the longitudinal axis of the sleeve (4).

Abstract: A pulley for a belt transmission device of the type including at least one shaft and two flanges supported by the shaft, one of the flanges, recessed centrally and received so as to fit onto the shaft for an axially free installation being fitted with return elements to return in the direction of the other flange, and delimiting with the other flange a groove of variable dimension inside which it is possible for the belt to be inserted, at least one of the flanges being a flange made of synthetic material furnished, on its surface facing the other flange, with a centrally recessed dish made of metal. The or each dish is, in its zone adjacent to the central recess, separated from the flange that it lines by a space, called a peripheral space, which reduces in the zone the thermal exchanges between flange and dish.

Abstract: Transmission device between an input drive shaft and an output shaft, of the type including a housing inside which are placed at least partially a reduction gear mechanism and a progressive cone clutch mechanism, the reduction gear mechanism including a driving member engaged with a driven member, formed by a gearwheel mounted so as to rotate freely on the output shaft and able to be coupled to/uncoupled from the output shaft via two friction cones of the clutch mechanism, the cones being placed coaxial to the axial bore of the gearwheel and capable of coming, under the action of a control device, into bearing contact with a conical bearing surface of the gearwheel. The conical bearing surfaces of the gearwheel are, relative to the axis of rotation of the gearwheel, offset axially from the gear teeth of the gearwheel and are placed on the same side of the gear teeth.

Abstract: A transmission between a drive element and a drive shaft of the wheels of a self-propelled tractor vehicle includes generally housed at least partially inside a box, a progressive friction clutch that includes at least one rotary driving element and two driven elements that are carried by the drive shaft and are integral in rotation therewith. These driving and driven elements are, under the action of a control element, brought into variable-tightening support contact to obtain a variation of the torque transmitted to the shaft. The drive shaft is formed by two half-shafts mounted to rotate freely relative to one another, each able to be connected, directly or indirectly, to one of the wheels of the vehicle, whereby each of the driven elements is carried by one of the two half-shafts.

Abstract: A direction-reversing device includes at least one input shaft, an output shaft, and direction-reversing element with a clutch sleeve including a moving clutch sleeve, mounted to move axially on one of the shafts carrying it to enable occupying forward and reverse positions. This device also includes a blocking element that is driven in rotation by the input shaft that carries the moving clutch sleeve, whereby this blocking element is mounted to move between the off position, in which the moving clutch sleeve is able to switch from one operating position to the next, and the on position, in which the blocking element forms an obstacle that prevents the switching of the moving clutch sleeve from one position to the next, being able to switch automatically from the off position to the on position when the input shaft is driven at a speed of rotation that exceeds a predetermined threshold value.

Abstract: A transmission device for an automotive vehicle of the type includes, mounted on an output shaft formed by at least two wheel drive half-shafts of a vehicle mounted to freely rotate one relative to the other, at least one rotary gearwheel, and two clutch mechanisms with clutch sleeves arranged on both sides of the gearwheel. This device includes, on the one hand, two clutch sleeve configurations: the driving configuration of the gearwheel, and the engine brake configuration of the gearwheel, and, on the other hand, a declutching control mechanism that includes at least one clutch sleeve pilot unit, coaxial to the gearwheel, mounted relative to the gearwheel that moves angularly between two end positions. The declutching pilot unit can be driven into each of the end positions by the two wheel drive half-shafts when they are driven at a speed of rotation that is different from that of the gearwheel.

Abstract: A transmission box (3) for a wheeled machine includes a motor input shaft (4) driving a drive wheel (8) to actuate at least one drive shaft (9A, 9B) of at least one wheel (2A, 2B) of the machine (1). A clutch mechanism (13) is disposed between the drive wheel (8) and a drive shaft (9A, 9B) and is actuated by driving in rotation the drive wheel (8) and deactuated by driving in rotation the drive shaft (9A, 9B) when the motor input shaft (4) is stopped or when the speed of rotation of the drive shaft (9A, 9B) is greater than the speed of rotation of the drive wheel (8). The box (3) contains two clutch mechanisms (13), each coacting with one drive shaft (9A, 9B) to permit the free wheeling of one and/or the other of a pair of wheels (2A, 2B).

Abstract: A transmission box (3) for a wheeled machine having, within the box (3), a motor input shaft (4) driving a drive wheel to actuate at least one drive shaft of at least one wheel (2A, 2B) of the machine (1). A clutch mechanism is disposed between the drive wheel and the drive shaft of the wheels (2A, 2B) of the machine (1), this clutch mechanism being actuated by driving in rotation the drive wheel and axial movement of a member on the drive shaft of the wheels (2A, 2B) and deactuated by driving in rotation the drive shaft of the wheels (2A, 2B). The member which is axially movable in the drive shaft of the wheels carries ramps coacting with a member secured in rotation with the shaft.

Abstract: The invention relates to a transmission, in particular between a drive shaft and a wheel driving shaft of an engine, in particular of an automotive engine, such as a riding mower engine, whereby this transmission is of the belt-controlled variable-speed drive unit type (2) combined with a clutch device (7).

Abstract: A transmission device between a primary drive shaft and an output shaft includes a housing inside of which is housed at least partially a reduction gear mechanism that consists of an engine-driving element, meshed with a driven element, adapted to be coupled to or uncoupled from the output shaft by a clutch mechanism that is activated/deactivated by axial movement of the gearwheel on the shaft. The clutch mechanism, retracted to the disengaged position, assumes the shape of a plate that is integral in rotation with the output shaft. The plate has on its face opposite the gearwheel, ramps designed to work during the engagement phase with ramps that are supported by the gearwheel.