Abstract: An uncoupling pulley includes a wheel rim including a first area, intended for receiving a belt connecting the wheel rim to a first power-transmission element, and a second area extending from the first area; a hub rigidly connected to a second power-transmission element; a ring gear including a first portion located under the second area and a second portion presented in the shape of a resilient cylindrical skirt extending, from the first portion, along the longitudinal axis, the cylindrical skirt of the ring gear including a plurality of longitudinal slots and consequently a plurality of portions separated from each other by one of the slots, the ring gear being capable of rotating relative to the wheel rim; and a device for driving the ring gear; and a resiliently deformable element, one end of which is attached to the hub and another end of which is attached to the ring gear.

Abstract: An uncoupling pulley provided with a longitudinal axis includes a wheel rim including a first area, intended for receiving a belt connecting the wheel rim to a first power-transmission element, and a second area extending from the first area; a hub rigidly connected to a second power-transmission element; one of the power-transmission elements being driving and the other being driven; a ring gear including a first portion located under the second area and a second portion presented in the shape of at least one cylindrical skirt extending, from the first portion, along said longitudinal axis, the ring gear being capable of rotating relative to the wheel rim and/or the hub about the longitudinal axis; a device for driving the ring gear by the wheel rim; a resiliently deformable element, one end of which is attached to the hub and another end of which is attached to the ring gear; the cylindrical skirt being located opposite the resiliently deformable element, so that the resiliently deformable element can engag

Abstract: Uncoupling pulley having a longitudinal axis, and including a wheel rim having a first zone, to receive a belt connecting the wheel rim to a first power transmission element, and second zone situated in the axial extension along the direction defined by the longitudinal axis of the pulley, of the first zone; a hub to be secured to a second power transmission element; one of the power transmission elements being driving, and the other being driven; a ring mounted below the second zone of the wheel rim and around the hub, so the ring can rotate, around the longitudinal axis, relative to the wheel rim and/or the hub; an elastically deformable element mounted between the hub and the ring; and a unidirectional clutch having an end fastened to the ring and the remaining part of which is mounted below the second zone of the wheel rim and above the ring.

Abstract: Uncoupling pulley having a longitudinal axis, and including a wheel rim having a first zone, to receive a belt connecting the wheel rim to a first power transmission element, and second zone situated in the axial extension along the direction defined by the longitudinal axis of the pulley, of the first zone; a hub to be secured to a second power transmission element; one of the power transmission elements being driving, and the other being driven; a ring mounted below the second zone of the wheel rim and around the hub, so the ring can rotate, around the longitudinal axis, relative to the wheel rim and/or the hub; an elastically deformable element mounted between the hub and the ring; and a unidirectional clutch having an end fastened to the ring and the remaining part of which is mounted below the second zone of the wheel rim and above the ring.

Abstract: A decoupling pulley having a rim attached to a first power transmission element, and a torsion spring mounted in a receptacle attached to a second power transmission element, one of the power transmission elements being driving and the other of the power transmission elements being driven, the receptacle is a bell inside which is centered the spring, which spring has a first and a second end region, each of which bears on a bearing face of the bell, wherein the rim has a first drive abutment having a first face cooperating with the first end region of the spring to drive the latter in the direction of closure in a first relative rotational direction between the rim and the bell, the bell includes a first bell abutment, the angular position of which defines a first given maximum value ?1 for the travel of the first end region of the spring driven to close by the first drive abutment.

Abstract: The invention relates to a decoupling comprising two elements in rotation about a longitudinal axis, namely a rim and a hub, and also comprising a load support which ensures relative rotation between the rim and the hub, together with a torque transmission element positioned between the rim and hub, which comprises an elastic device deformable parallel to the longitudinal axis and comprising at least one elastic element, the pulley being characterized in that the torque transmission element comprises:—a first annular plate (1) connected in terms of rotation to one of the two elements, rim (4) or hub (3), and capable of moving axially with respect to thereto, having a first end face (11) in contact with a first end face (51) of the elastic device (5) and a second end face opposite to the first end face and comprising at least one first ramp path having at least one inclined zone (12, 14) forming a circular sector centred on the longitudinal axis and making a non-zero angle (?, ?1, ?2) with respect to a plane p

Abstract: The invention relates to an uncoupling pulley comprising a rim secured to a first power-transmitting element, and a torsion spring mounted in a receptacle secured to a second power-transmitting element, one of the power-transmitting elements being a driving element and the other of the power-transmitting elements being driven, characterized in that the receptacle is a bell-housing inside which the spring is centered, which spring has a first end region (12) and a second end region (14), each of which regions bears against a bearing face (32, 34) of the bell-housing (3), in that the rim has at least one first driving stop (42) having a first face (47) collaborating with the first end region (12) of the spring (1) to drive the latter in the direction of closing up in a first direction of relative rotation of rim (4) and bell-housing (3), and in that the bell-housing (3) comprises at least one first bell-housing stop (37, 37?, 118) of which the angular position defines a first given maximum value ai for the trav

Abstract: The invention relates to a power transmission belt presenting elastomer teeth based on ethylene alpha olefin elastomer provided with an outer woven or non-woven covering. According to the invention the teeth are covered in a barrier layer, in particular of a thermoplastic material, and said outer covering, at least on the flanks of the teeth, is partially included in a portion of the thickness of the barrier layer.

Abstract: The invention relates to a ribbed power transmission belt exhibiting a toothing made of elastomer based on ethylene/?-olefin elastomer, characterized in that at least the sides of the toothing are coated with a film made of at least partially crosslinked thermoplastic comprising at least 30% of at least one low-density polyethylene having a molecular weight of between 50 000 and 200 000 g/mol. The invention also relates to a manufacturing process which makes use of the application of a said thermoplastic film in the noncrosslinked or at least partially crosslinked state.

Abstract: A power transmission belt, in particular for a motor vehicle and presenting at least V-ribs having flat side faces and rounded ridges, wherein the ridges present a convex curvilinear profile having a mean radius of curvature greater than 1 mm and less than or equal to 1.5 mm.

Abstract: The invention relates to a power transmission belt presenting elastomer teeth based on ethylene alpha olefin elastomer provided with an outer woven or non-woven covering. According to the invention the teeth are covered in a barrier layer, in particular of a thermoplastic material, and said outer covering, at least on the flanks of the teeth, is partially included in a portion of the thickness of the barrier layer.

Abstract: The invention relates to an extensible V-ribbed belt 1 presenting a reinforcing structure 5 constituted by a polyamide 6.6 cord, the belt presenting a dynamic modulus at 120° C. and at 2 h lying in the range 7000 N/t/str/% to 10,000 N/t/str/%.

Abstract: The invention provides a power transmission belt, in particular for a motor vehicle and presenting at least V-ribs having flat side faces and rounded ridges, wherein said ridges present a convex curvilinear profile having a mean radius of curvature greater than 1 mm and less than or equal to 1.5 mm.

Abstract: A belt tensioner for a mechanical power transmission such as in a motor vehicle engine. The belt tensioner includes a wheel for bearing against the belt and a resilient return device for ensuring that the wheel bears against the belt with pre-stress. The wheel further includes a covering of vibration absorbing material. The invention is particularly applicable to mechanical engineering and specifically to the car industry.

Abstract: A decoupling device comprising first and second coaxial elements in mutual rotary driving engagement and including resilient decoupling means enabling relative angular displacement for decoupling purposes between the first and second elements. The decoupling members comprise at least one fin carried by the first element and at least one first and one second abutment carried by the second element and angularly spaced apart one from the other, and at least one first and one second resilient device interposed between the fin(s) and the first and second abutments, respectively.

Abstract: An automatic tensioner for a synchronous transmission toothed belt, including a roller adapted to cooperate with the belt and an actuator comprising within a cylindrical body: a piston pierced by a multiplicity of channels delimiting therein a pressure chamber and a supply chamber for a hydraulic fluid, a push rod secured to the piston and whose motion is suitable for being transmitted to the roller, a compression spring urging the piston towards the supply chambers, and a non-return valve received in the pressure chamber to open or close said channel, thereby allowing or preventing hydraulic fluid to pass between the pressure chamber and the supply chamber, when a lip of said valve comes into contact with or moves away from its seat in order to close or open said channels.