Abstract: A driven-wheel hub (18) includes an axial cavity (36) for the passage of the body of a bolt (16) for fixing a driving member (14) onto the hub. This member (14) is provided with a tapped hole (17) into which the threaded end (16A) of the bolt body is screwed. The cavity (36) has a diameter which is very much larger than the diameter of the bolt body and is bordered at its rear end by a bearing surface (40) for the head (45) of the bolt. The hub (18) furthermore includes a way of ensuring that it rotates as one with the driving member. A guide for guiding the bolt (37) are provided in the cavity (36) between the said bearing surface (40) and the entry to the tapped hole (15). The guides (38) are spaced away from the said bearing surface (40) along the axis of the hub.

Abstract: A transmission joint portion has an envelope with an interior peripheral surface. A plurality of bearing paths are defined by bearing tracks distributed about the axis of the envelope inside the envelope. Each bearing track has a bearing path surface on one side thereof and an opposite surface facing the interior peripheral surface of the envelope. An interior space is defined between the interior peripheral surface of the envelope and the opposite surfaces of the bearing tracks. A filler material made of one of a thermosetting and a thermoplastic matrix is filled into the interior space between the interior peripheral surface and each opposite surface. The interior peripheral surface is provided with portions extending opposite the opposite surfaces of the bearing tracks, with each portion having a contour that is substantially the same as the contour of the respective opposite surface.

Abstract: The four trunnions (11) transmit the rotation of the shaft (8) to the body (1) through the intermediately of four tracks (3) which oscillate by rolling without sliding on the inner wall of the body (1). In addition, each track (3) is coupled angularly with the two adjacent tracks by mating teeth (7) so that any inclination of one track produces a contrary inclination of the two adjacent tracks and consequently an inclination in the same direction of the opposite track. The radii (a, b) according to which the tracks roll against the inner wall of the body and the position of the center of gravity (G) of the tracks are such that the centrifugal force (F) returns the tracks into neutral position. The inherent oscillation frequency of the tracks under the effect of this return is equal to twice the speed of rotation of the joint.

Abstract: The invention proposes a process for manufacturing a transmission shaft made of a composite material comprising at least one step for producing an external layer comprising reinforcing fibers impregnated with a heat-curable resin, characterized in that a peripheral sheath made of a knitted article is installed over the external layer prior to the curing of the resin during the polymerization cycle.

Abstract: The invention relates to transmission devices comprising at least one joint and/or at least one sliding connection and more particularly concerns taking up clearances and providing a dynamic balancing of such devices. The invention comprises mainly intentionally sufficiently unbalancing an inner or "floating" part of the device to exceed the random imbalance resulting from radial clearances existing in the joints (20) or sliding connections. The subsequent balancing of the whole of the transmission device is in this way rendered really effective.

Abstract: An axially fixed transmission joint (10) has a first element (16) which is connected to a first shaft (12) and carries articulation elements (22) of the transmission joint (10) which interact with complementary bearing tracks (24) formed in a second element (18) of the transmission joint (10) which is connected to a second shaft (14). The transmission joint (10) further has an axial stop member (32) connected to the first element (16) which interacts with a complementary spherical stop surface (52) formed in a sealing boot (54) of the transmission joint (10) for immobilizing the first element (16) axially in relation to the second element (18) in at least one direction of relative axial displacement. The sealing boot (54) has a first end (58) which is fastened to the second element (18) and a second end (62) which is fastened to the first shaft (12).

Abstract: There is provided a device which incorporates a viscous-fluid coupling (68) and a friction clutch (74) in which are integrated actuation means (80, 81) which cause the engagement or the release of the clutch as a function of the speed of rotation of one of the members which are connected by the device.

Abstract: The invention relates to a transmission device between two coaxial rotating members (1; 10), of the type comprising a viscous-fluid coupling (11) with a driving element and a driven element, and control devices for modifying the operating characteristic of this coupling. It is defined, in particular, in that the control devices are incorporated into the transmission device and act as a function of the rotational speed of one the said members and as a function of a torque transmitted by the device. The control devices can comprise flyweights (21) which are rotationally integral with the member (1) and with the case (12) of the viscous-fluid coupling, these flyweights acting to modify the internal pressure in the coupling (11), via shuttles (27) and a sliding sleeve (8) which is displaced as a function of the torque transmitted between the sun gear (2) and the output shaft (10). This sliding sleeve can, for example, act on a plate (16) which modifies the spacing between the disks (14, 15) of the coupling.

Abstract: A transmission joint body (10) intended to be connected to a shaft (13) has several bearing paths for articulation elements distributed around an axis (X--X) of the body. Each bearing path comprises two fixed or movable tracks (14) arranged so as to cooperate with articulation elements of the transmission joint. Each track is constituted by a first surface (16) of a metal part (14). A second surface (18) is associated with a complementary surface (20) of the joint body (10) formed in a portion (12) of the joint body constructed of a composite material constituted by a reinforced thermosetting or thermoplastic matrix. At central longitudinal axis (ACR) of each bearing path, contained in a plane containing the axis (X--X) of the shaft (13), forms an angle (.alpha.) with the geometrical axis of the shaft.

Abstract: A joint comprises a tripod equipped with three spherical pivots, and a barrel with six cylindrical inner tracks. Intermediate elements comprise a cylindrical surface complementary with the spherical pivot and a surface of circular profile complementary with the circular profile of the tracks. The intermediate elements are blocks, the surface of circular profile of which is a cylindrical surface permanently bearing slidably in the tracks. The joint enables reducing the contact pressures, increasing the telescopic stroke, simplifying the form of the intermediate elements and making it possible to produce them from a material of moderate hardness.

Abstract: A transmission joint body has an envelope inside which are provided bearing paths for articulation elements of a transmission joint (10). A connection system for the joint body includes a radial flange connected to the envelope. The flange is made at least partially from a material comprising a thermosetting or thermoplastic matrix reinforced with short fibers or with particles. According to a preferred embodiment, the inner space defined radially by the inner peripheral surface of the envelope of the joint body is partially filled with a material comprising a thermosetting or thermoplastic matrix reinforced with short fibers or with particles, and which is extended outside the envelope through one axial end of the latter in order to form the flange.

Abstract: The invention provides an arrangement for driving in rotation two transmission shafts (18) of a motor-driven road vehicle, each connected to a wheel of the same axle, characterised in that each of the two transmission shafts (18) is connected to the engine unit (10) of the vehicle by means of a device (22) allowing a variable slip between its input member (40) and its output member (36), and means for controlling the two variable-slip devices (22), which regulate the rotational speeds of the two transmission shafts in order to keep these speeds within a specific range of relative variation.

Abstract: There is provided a device for the mechanical transmission of forces between a first input element and a second output element, characterised in that it comprises an input member (12) connected to the first element, an output member (14) connected to the second element and a force transmission block (16) which is interposed between these two block members (12, 14) and is capable of experiencing elastic deformation under the action of the compressive forces exerted on it by the two members when these are displaced relative to one another in the main force transmission direction (X--X), and in that it comprises a controlled means (24) for varying the rigidity of the force transmission block (16) in the main direction (X--X) by exerting a control force (FC) on it.

Abstract: A transmission joint has a body connected to a first shaft which delimits a cavity. Inside the cavity is formed at least one pair of running tracks, in which is received a running element connected to a second shaft. The joint has an element for axially retaining the body relative to the second shaft, which element comprises an elastically deformable element which has the shape of a body of revolution, a high axial rigidity and two coaxial, cylindrical joining surfaces, an inner surface and an outer surface, which are connected to the second shaft and the body, respectively.

Abstract: A transmission joint has a first element connected to a first shaft and mounted in an articulated manner in a second element to form a housing fastened to a transmission member. The housing includes a radial fastening flange mounted axially slidably relative to the outer casing of the housing and an apparatus for immobilizing the fastening flange axially relative to the outer casing of the housing when the second element is in the fixed position on the transmission member. The process employed to assemble the transmission joint temporarily secures the housing relative to the first member until the housing is secured to the fastening flange.

Abstract: A transmission joint has a joint body integrally connected to a first shaft and delimits a cavity (14), open at its end opposite the first shaft. Inside is formed at least one pair of running tracks between which is received a running element connected to a second shaft. A bellows seals the cavity, and a first end of which is connected to the body and the second end of which is connected to the second shaft. The axial free end edge of the joint body which delimits the opening of the cavity is equipped with a cap piece of a complementary shape which extends axially from the edge towards the second shaft, and the first end of the bellows is fixed to the cap piece.

Abstract: A transmission joint body has a plurality of bearing passageways for articulation elements distributed around the axis of the body and, each comprising two raceways arranged to cooperate with articulation elements of the transmission joint. Each raceway includes a first surface of a metal member, a second surface of which is associated with a complementary surface of the joint body and, formed in a portion of the joint body. The body is made of a composite material of a reinforced thermosetting or thermoplastic matrix. The second surface of the metal member is capable of displacement relative to the complementary surface of the joint body.

Abstract: The invention provides a rotary shock absorber (10) of the type comprising a sealed hollow cylindrical housing (12) in which are arranged discs (50A, 50B) alternately integral in terms of rotation with the housing (12) or with a coaxial central shaft (22) mounted rotatably in the housing (12), the inner chamber (20) delimited by the housing (12) being filled at least partially with a viscous fluid received between the mutually confronting faces of the discs, characterized in that it comprises a displacement member (58) for varying the law of damping of the shock absorber as a function of the relative angular displacement of the central shaft (22) in relation to the housing (12).

Abstract: A barrel to be formed has internal tracks of circular profile which abut ridges (4). The process starts with a sheet-metal blank which is arranged around an inner shaping mandrel equipped with protuberances integral or rotatably attached and defining shaping surfaces for the tracks. Three dies are displaced radially and have a projection which initiates a fold and which than forces this fold between the protuberances in order to produce the ridge as a result of a flow of material towards this region, which will undergo a very high load during operation.

Abstract: According to the invention, an output element of a differential is made in two parts (14a, 14b), one (14b) of these two parts being axially mobile under the effect of a torque transmitted through this output element. This axial displacement is used to act either on a friction clutch or preferably on a coupling of the viscocoupler type in order to modify its characteristics.Application particularly to motor vehicles.