Abstract: Continuously variable transmission provided with a first pulley having two pulley discs, with a second pulley having two pulley discs and with a drive belt wound around the pulleys for transmitting torque therebetween, at least one disc of the first pulley being axially movable with respect to the other disc of the pulley under the influence of an axial force provided on the movable disc by a hydraulic pressure in a cylinder of a piston/cylinder assembly associated with the first pulley. The continuously variable transmission is further provided with a control system capable of controlling the pressure in the cylinder and including a pump for generating a flow of hydraulic medium from a reservoir to a main hydraulic line and a line pressure valve at least operable by a control pressure which is regulated by an electronically operable pressure regulator, for controlling a line pressure in the main hydraulic line.

Abstract: A drive assembly for operatively connecting at least one drive input unit and at least one drive output unit in a motorized vehicle, including a transmission unit, with an epicyclic gearing operatively arranged in parallel to the transmission unit, one rotational member of the epicyclic gearing being provided with a flywheel function.

Abstract: The invention relates to a drive belt (1) comprising at least one continuous band (22) engaged with a number of plate-like transverse elements (30) such that the elements (30) may slide freely along a longitudinal direction (L) of the continuous band (22), whereby the elements (30) are provided with a taper (31) allowing mutual rotation of adjacent transverse elements (30) about a transversely oriented axis (32) thereby defining a minimum radius curvature (RMIN) at which the drive belt (1) may be bent in its longitudinal direction (L) and whereby the continuous band (22) is provided with an internal residual stress distribution conforming to a longitudinally bent posture having a pre-bending radius (RPB), characterized in that, the pre-bending radius (RPB) of the said at least one continuous band (22) is considerably larger than twice the said minimum radius of curvature (RMIN).

Abstract: The present invention relates to a transmission system, especially for use in a motorized vehicle. More particularly, the present invention discloses the use of a flywheel for assisting an engine in speeding up when acceleration is requested. The flywheel (135) is coupled to an epicyclic gearing (G) having three rotational members (41, 42, 43); this epicyclic gearing (G) is further coupled to a load (L) and to an engine (E), in parallel to a transmission unit (MT; CVT).

Abstract: Drive belt for a continuously variable transmission, in particular for motor vehicles, includes at least one continuous band slidably supported by a number of cross elements each having two principle faces oriented substantially transverse to the longitudinal direction of the drive belt, the cross elements having a width B and a specific weight &rgr;. The parameters of the width B and the specific weight &rgr; satisfy the expression B2·&rgr;≦10.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: A drive belt for a transmission realizing a continuously adjustable transmission ratio comprising at least one continuous band having a part, which, when in a longitudinally stretched state, shows a curvature in a direction transverse to the longitudinal direction of the drive belt (1), said curvature being of a generally arc-like shape having a stretched band radius RSB, associated with a number of cross elements, each having a contact face for interacting with a principal face of the continuous band and provided with a transverse convex curvature of a generally arc-like shape having a face radius RS. The inverse value of the face radius RS minus the inverse value (1/RSB) of the stretched band radius RSB is notionally larger than −5 m−1, preferably larger than −3.5 m−1.

Abstract: The invention relates to a metal push belt (1) for application in a continuous variable transmission, comprising at least one endless tensile means (2), and transverse elements being provided freely moveable in the endless direction of the tensile means (2), the tensile means being produced of steel, containing non-metallic inclusions of predetermined sizes as observed in the micro-structure of a material section, in accordance with a specified diameter Dcircle of a circle relating to the surface occupation of such an inclusion observed in such micro structure, in which the steel is produced in a constitution having a nominal inclusion size distribution with diameters ranging up to 30 &mgr;m, the inclusion diameter range between 10 &mgr;m and 30 &mgr;m being less than 20% of the total number of inclusions per square unit of sliced material counted by inclusions having a size larger than 2 &mgr;m.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: A continuously variable transmission (1) is provided with: an endless transmission (14) for transmitting a driving torque; a clamping force (13-1, 13-2) coupled with the endless transmission (14) for applying a clamping force thereon; a controller (15) coupled with the clamping force (13) for influencing the driving torque by controlling the clamping force applied on the endless transmission (14); and a clutch (16) coupled with the controller (15), whereby the controller (15) is arranged to control the clutch such that the clutch (16) is allowed to slip continuously. The net effect of a practical implementation of the transmission in a vehicle is a fuel saving which, if a slip of around 5 rpm is permitted, amounts about 3-4%.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump for operating an automatic transmission for motor vehicles. The pump is provided with a pump housing (12), a rotor (4), a cam ring (2) and roller elements (7), which define a number of pump chambers (13). Fluid is communicated between a hydraulic channel (24) and a pump chamber (13) through suction ports (11 and 16) and discharge ports (17 and 18). According to the invention the pump is provided with a suction port (26) for allowing a predominantly radial flow of fluid to a pump chamber (13) and/or with a rotor (4) with slots (6) with a circumference (32) which is partly curved with a curvature substantially matching the curvature of the roller elements (7) and/or with a rotor (4) with a circumference segment (30) deviating at least partly from a circle, in order to decrease the amount of wear of pump parts as well as the noise level generated during pumping.

Abstract: A driving belt for use in a continuously variable transmission comprising two V-shaped pulleys. The driving belt comprises a carrier consisting of two endless band packages lying side by side, on which transverse elements are disposed. Each transverse element includes two recesses positioned opposite each other for receiving the band packages, so that a part of the transverse element is positioned between said band packages. Each recess includes an inside surface facing towards the band package, wherein the portion of the inside surface that is formed by the aforesaid part of the transverse element includes an acute angle, near the underside of the band packages, with the plane in which the band packages lie.

Abstract: Described is a continuously variable transmission (1) comprising a rotatable drive pulley (2) and a driven pulley (5), each of which having an axially displaceable sheave (4, 6) for transmission ratio control by varying the running radii of a torque transmission belt (8) running between the sheaves (3, 4; 6, 7); and a lubrication nozzle (9) having an output (O1, O2) for supplying a lubricating fluid to a midpoint (M1, M2) at the inner side of the belt (8), whereby at least one output (O1) of the lubrication nozzle (9) at the driven pulley (5) is directed to the midpoint (M1) of the transmission belt (8) while running in a transmission ratio (TOP) area, wherein a maximum power is transmitted by the transmission belt (8). The belt (8) is thus effectively cooled at a radial position within the driven or secondary pulleys (2), where due to a maximum power loss the generated heat is maximal.

Abstract: A continuous variable transmission includes a pair of pulleys forming V-shaped grooves for receiving an endless transmission element for transmitting torque between the pulleys. Each pulley includes at least one axially movable sheave which may be urged axially in the direction of the transmission element by an urging element effecting a clamping force between the sheave and the transmission element, the effected clamping force corresponding to a force sufficient for transmitting a torque to be transmitted by at least virtually slipless friction between the pulley sheaves and the belt, increased by a safety margin expressed as a factor corresponding to a percentage of the torque to be transmitted throughout a major part of the range of torques transmittable to the relevant transmission.

Abstract: A continuously variable transmission includes a set of pulleys mounted on respective pulley shafts (35, 36) and mounted with an endless transmission element for transmitting rotational movement from one pulley to the other, whereby the pulleys are incorporated in the transmission pre-mounted on an common support plate (22). The transmission thereby is provided with a favorable produced housing.

Abstract: Drive belt (10) for a continuously variable transmission, as for use in motor vehicles, having transverse elements (20) and at least one endless carrier. The transverse elements (20) are each provided with a recess (21), which extends between a first and a second main face (22 and 23, respectively) of a transverse element (20), which main faces are oriented transversely to the intended direction of movement (C) of the drive belt (10). The recess (21) offers accommodation for the carrier (30) and at least is bounded by an abutting face (24), intended to come into contact with a main face (30′) of the carrier (30), and a boundary face (25), which is oriented transversely thereto and restricts the freedom of movement of the carrier (30) in the axial direction. The boundary face (25) merges into the first main face (22) and into the second main face (23) via transition edges (27, 27′), characterised in that the radius of curvature (R) of at least one transition edge (27) is less than 0.2 mm.

Abstract: A driving belt for use in a continuously variable transmission comprising two V-shaped pulleys, which driving belt comprises a carrier consisting of two endless band packages lying side by side, on which transverse elements are disposed. Each transverse element includes two recesses positioned opposite each other for receiving the band packages, wherein a part of the transverse element is positioned between said band packages. The front side of the transverse element includes a projection, which can mate with a recess in the adjacent transverse element. Said projection and said recess are at least partially formed in the aforesaid part of the transverse element.

Abstract: Described is a continuously variable transmission (1) comprising: a primary pulley (2); a secondary pulley (3), whereby a drive belt (14) is wrapped around said pulleys (2, 3) at a variable radial position between discs of each pulley (2, 3) and a transmission control means (13) for controlling a transmission torque ratio between a maximum and a minimum value (Rmax, Rmin), whose quotient defines a transmission ratio coverage, which is variable in dependence on the rotational speed of the primary pulley instead of being fixed as in the prior art.