Van Doorne's Transmissie B.v.

Bosch Transmission Technology B.v.

Robert Boschgmbh

Johannes Gerardus Ludovicus Maria Van Spijk

Francis Maria Antonius Van Der Sluis

Elias Van Wijk

Arjen Brandsma

Hendrikus Adrianus Arnoldus Wilhelmina Pelders

Hendrikus Adrianus Arnoldus Pelders

Adrianus Johannes Wilhelmus Van Der Leest

Continuously variable transmission includes a set of pulleys, each pulley comprising two discs arranged relatively axially moveable on a central pulley shaft for clamping a transmission belt. The belt includes a continuous array of transverse elements, each having lateral pulley contact surfaces for contacting the belt contact surface of each of the pulley discs, and being provided slideably on an endless tensile element of the belt. Each pulley has a mechanical stiffness as incorporated in the transmission and a stiffness related feature of a pulley when expressed as a parameter Sag that indicates an amount of radial displacement of the belt between the discs in the transmission, occurring in response to imposing a maximum amount of axial force Fax during operation of the transmission, relative to a radial position of the belt in an unloaded state of the transmission, amounts to less than 1.2 mm but more than 0.5 mm.

Efficient high torque continuously variable transmission

Continuously variable transmission provided with a primary pulley and a secondary pulley, around which a drive belt is arranged, clamped between two conical pulley discs of the respective pulley, a running surface of at least one pulley disc of the primary pulley and the secondary pulley, via which running surface this pulley disc contacts the drive belt, being provided, as seen in a cross section oriented perpendicular to a tangential direction, with a curvature, so that a pulley angle between a tangent on the running surface and a radial direction varies between a lowest value at the location of a radially innermost position on the running surface and a highest value at the location of a radially outermost position on the running surface. The curvature of the running surface of the primary pulley and that of the running surface of the secondary pulley differ from one another.

Continuously variable transmission

A hydraulically controllable constant speed drive, includes an input shaft () provided with an input pulley (), an output shaft () provided with an output pulley () and a drive belt (). Each pulley () is provided with two pulley sheaves () that are mutually axially displaceable under the influence of a hydraulic pressure to be exerted in a piston-cylinder assembly () associated with the pulley () and that define a tapered groove of variable axial width wherein the drive belt () is accommodated. An input spring () is provided that realizes an axial force urging the pulley sheaves () of the input pulley () towards each other to prevent slip of the drive belt () when the hydraulic pressure is negligible.

Hydraulically controllable constant speed drive and method for the design thereof

A transmission includes a set of pulleys, in which at least one disc is axially displaceable and provided with cylinder piston elements. The cylinder/piston elements include at least one pressure chamber with radial walls and concentric cylinder walls and at least one of the radial walls of the pressure chamber is secured to one of the concentric cylinder walls by an immovable fit. The wall near to the fit is produced with a resiliently hingeable feature, in which the hinging feature is realized with the inclusion of an axially extending sleeve like foot part, integral to the wall, and with both axial faces thereof extending uninterrupted smoothly up to the lower end part of the wall.

Continuously variable transmission and pulley

Roller vane pump, in particular suited for pumping fluid in a continuously variable automatic transmission of a motor vehicle, provided with a pump housing accommodating a substantially cylindrical carrier, which is rotatable about a central axis, and a cam ring encompassing the carrier in the radial direction, whereby a radial clearance between the carrier and the cam ring varies along a circumference of the carrier, and with a pump shaft extending co-axial with said central axis through the carrier, characterised in that there is provided in the pump housing a bearing bush having an essentially cylindrical central bore through which the pump shaft extends.

Roller vane pump incorporating a bearing bush

A continuously variable transmission includes a set of pulleys mounted on respective pulley shafts ( ) 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 ( ). The transmission thereby is provided with a favorable produced housing.

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 ( ), a rotatable carrier ( ) being located in the interior of the pump housing ( ), a cam ring ( ) surrounding the carrier ( ) in radial direction, and roller elements ( ) being provided in slots ( ) in the carrier periphery. The spaces between the pump housing ( ), the carrier ( ), the cam ring ( ) and the roller elements ( ) define a number of pump chambers ( ). Furthermore, the pump is provided with feed apertures ( ) for allowing a flow of fluid to a pump chamber ( ) and with discharge apertures ( ) for allowing a flow of fluid from a pump chamber ( ). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Mechanically driven roller vane pump

Mechanically driven roller vane pump with channels between corresponding cam and carrier chambers

Mechanically driven roller vane pump with aperture end parts providing for gradual pressure changes in the pump chambers

Mechanically driven roller vane pump with enlarged surface area of the apertures

The invention relates to a roller vane pump for operating an automatic transmission for motor vehicles. The pump is provided with a pump housing ( ), a rotor (4), a cam ring ( ) and roller elements ( ), which define a number of pump chambers (13). Fluid is communicated between a hydraulic channel ( ) and a pump chamber ( ) through suction ports ( and ) and discharge ports ( and ). According to the invention the pump is provided with a suction port ( ) for allowing a predominantly radial flow of fluid to a pump chamber ( ) and/or with a rotor ( ) with slots ( ) with a circumference ( ) which is partly curved with a curvature substantially matching the curvature of the roller elements ( ) and/or with a rotor ( ) with a circumference segment ( ) 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.

Roller vane pump having a partly curved vane slot

The invention relates to a roller vane pump for operating an automatic transmission for motor vehicles. The pump is provided with a pump housing (,), a rotor (,), a cam ring (,) and roller elements (,), which define a number of pump chambers (,). Fluid is communicated between a hydraulic channel (,) and a pump chamber (,) through suction ports (,and,) and discharge ports (,and,). According to the invention the pump is provided with a suction port (,) for allowing a predominantly radial flow of fluid to a pump chamber (,) and/or with a rotor (,) with slots (,) with a circumference (,) which is partly curved with a curvature substantially matching the curvature of the roller elements (,) and/or with a rotor (,) with a circumference segment (,) 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.

Roller vane pump having straight line segments on the rotor

A continuously variable transmission is provided with an adjustable pulley assembly including two sheaves on a pulley shaft, at least one sheave is axially movable with respect to the pulley shaft by a hydraulically operated movement, the movement includes a piston/cylinder assembly for generating a first force acting on the movable sheave and centrifugal pressure compensator for generating a second force acting on the movable sheave in a direction opposite with respect to the first force; the centrifugal pressure compensator includes a further cylinder fixed to the axially movable sheave in radial direction beyond the piston/cylinder assembly, and a further piston fixed to the pulley shaft, the further piston and the further cylinder form a further piston/cylinder assembly.

Growing community of inventors

Drunen, Netherlands

Johannes Gerardus Ludovicus Maria Van Spijk