Abstract: The invention relates to a hydraulically controllable constant speed drive, comprising an input shaft (10) provided with an input pulley (1), an output shaft (20) provided with an output pulley (2) and a drive belt (3). Each pulley (1; 2) is provided with two pulley sheaves (11, 12; 21, 22) that are mutually axially displaceable under the influence of a hydraulic pressure to be exerted in a piston-cylinder assembly (14, 15; 24, 25) associated with the pulley (1, 2) and that define a tapered groove of variable axial width wherein the drive belt (3) is accommodated. An input spring (17) is provided that realises an axial force urging the pulley sheaves (11, 12) of the input pulley (1) towards each other to prevent slip of the drive belt (3) when the hydraulic pressure is negligible.

Abstract: A shift control apparatus for controlling a continuously variable transmission device including a continuously variable transmission mechanism having rotary elements and operable to transmit a rotary motion of a drive power source of an automotive vehicle to a drive wheel of the automotive vehicle, such that a speed ratio of said mechanism is continuously variable, the shift control apparatus includes a power-transmission-state determining device for determining whether the mechanism is placed in a non-power-transmitting state, a speed-ratio determining device for determining whether the mechanism is placed in a lowest-speed position, a rotation-stop detecting device for determining whether the rotary elements are at rest, and a compulsory-speed-ratio-change implementing device for effecting a compulsory shift-down action of the mechanism toward the lowest-speed position when the mechanism is placed in the non-power-transmitting state while the mechanism is not placed in the lowest-speed position and while th

Abstract: A continuously variable transmission including two pairs of conical disks of which one disk of each pair is axially movable toward and away from the other disk and having an endless loop member in the form of a belt that passes around each pair of disks and transfers torque between the pairs of disks. The axially movable conical disk includes a contact pressure chamber to move the disk axially by the application of hydraulic pressure. The movable disk also includes an integrated torque sensor that is operative for controlling the contact pressure between the disks of a pair of disks and the endless loop member as a function of the torque.

Abstract: The invention concerns a continuously variable belt-drive transmission, especially for motor vehicles. In the pressure less state of the transmission, the axially displaceable cone pulley of the input shaft is loaded with an axial force by a spring system in a manner such that the contact pressure increases on the belt-drive mechanisms and the ratio of the transmission is reduced.

Abstract: A power transmission interruption apparatus transmits and interrupts power between an input shaft as a rotation member and a second rotation element, and between the input shaft and a fourth rotation element using a first clutch and a second clutch. In the power transmission interruption apparatus, a centrifugal hydraulic pressure canceller chamber of a first hydraulic cylinder is formed using, as a cancel plate, a cylinder tube of a second hydraulic cylinder, which causes the second clutch to be engaged. Therefore, as compared with a case where the cancel plate is separately provided, the number of components decreases, which reduces the weight and manufacturing cost. In addition, a linear dimension in the direction of the axis is shortened, which makes the configuration compact.

Abstract: A hybrid power system with continuously variable speed, comprising a first power unit, a secondary shaft, a speed converter, a clutch, a second transmission device, and an electric motor. The first power unit has a primary shaft. The secondary shaft is driven by the primary shaft in a rotational movement. The speed converter is placed between the primary shaft and the secondary shaft, having a transmission belt, transmitting torque from the primary shaft to the secondary shaft. The clutch is set on the primary shaft or on the secondary shaft and has a drum, allowing or interrupting transmission of torque from the first power unit to the secondary shaft. The second transmission device is connected with the drum of the clutch. The electric motor is connected with the secondary shaft, either driving the secondary shaft or being driven by the secondary shaft to generate electricity or running idle.

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: The invention concerns a continuously variable transmission especially for a motor vehicle. During a zero pressure condition of the transmission, the axially slidable conically tapered disk, on the input shaft, is subjected to a spring force, by a spring arrangement, so that the pressure on the V-belt is increased and the gear ratio of the transmission is lowered to an acceptable level to prevent inadvertent damage to the transmission.

Abstract: A continuously variable transmission having a primary pulley and a secondary pulley on which a belt wound on the primary pulley is fitted. The width of the groove on the primary pulley is adjusted by the oil pressure in the primary hydraulic chamber in the primary cylinder, the width of the groove on the secondary pulley is adjusted by the oil pressure in the secondary hydraulic chamber in the secondary cylinder. The switching operation between the speed change operation in a state in which the line pressure is supplied to the secondary hydraulic chamber and the primary pressure is supplied to the primary hydraulic chamber by the oil passage switching valve, and the speed change control in a state in which the line pressure is supplied to the primary hydraulic chamber and the primary pressure is supplied to the secondary hydraulic chamber can be performed.

Abstract: In a belt type continuously variable transmission, the apertures 55a, 56a of the drain ports of an oil pressure control valve employed for control of hydraulic devices are arranged outside of the circumferential region WB of the range of movement in which the belt can be moved in the pulley axis direction when the pulley groove width is changed during gear change operation, or outside of the circumferential region WP of the region in which the V groove face of the pulley can be arranged when the pulley groove width is changed during gear change operation.

Abstract: The device for controlling a CVT transmission which is connected with a pendulous drive, especially an internal combustion engine for a motor vehicle having front-transverse drive, has a hydromotor simultaneously used as sensor and actuator, the output signal of which is a function of the size and of the dynamics of the engine torque, the same as an electrohydraulic control unit which controls the actuating areas of the primary and secondary pulleys of the CVT via electromagnetic actuating elements and hydraulic valves. In addition to pressure-regulating valves, pressure-reducing valves and at least one emergency valve, the device has a coupling of the hydromotor with the second pressure-reducing valve via a line which coupling is used for torque modulated control of the second pressure-reducing valve in an emergency operating mode.

Abstract: A system for adjusting the tension of a continuous part of a continuously variable transmissions; which is adjustable preferably with respect to its transmission ratio, the continuously variable transmission being mounted together with a vehicle engine and at least one clutch and a vehicle engine in the drive train of the vehicle, the clutch having various operating states. The essence of the invention is the adjustment of the tension at least in dependence upon the operating state of the clutch. The adjustment of the tension of the continuous part is especially advantageous when it is undertaken in dependence upon whether an adjustment of the transmission ratio of the continuously variable transmission takes place toward higher transmission ratios or to lower transmission ratios. Furthermore, the adjustment of the tension can take place in dependence upon the activation of an ABS system, ASR system and ESP system.

Abstract: A method is described for control of a CVT automatic transmission (1) in which a sensed main pressure (p_hd_act) and a sensed contact pressure (p_s2_act) of a secondary pulley (7) are entered as signals in an electronic transmission control (8). For diagnosis of an error in the sensing of the main pressure (p_hd_act) and/or of the contact pressure (p_s2_act) of the secondary pulley (7) their actual values or comparison variable (|p_hd_act-p_hd_nom|, |p_s2_act-p_s2_nom|) formed therefrom are compared with applicable threshold values (p_hd_min, pd_phd_regdiff, p_s2_min, pd_ps2_regdiff) associated with a range of plausible pressure values.

Abstract: A system (10), in particular an electrohydraulic system (10), for adjusting the contract pressures of a continuously variable gear, in particular a double-cone pulley belt-contact gear, which has a device for changing the gear ratio of the gear having at least one primary pressure chamber and one secondary pressure chamber is proposed. An electrically triggerable primary pressure valve (Vprim) for adjusting the pressure in the primary pressure chamber and an electrically triggerable secondary pressure valve (Vsec) for adjusting the pressure in the secondary pressure chamber are provided. The pressure (pprim) of the primary pressure chamber and the pressure (psec) of the secondary pressure chamber can be carried to the secondary pressure valve (Vsec). The object is to enable a more-accurate adjustment of the pressure (pprim) in the primary pressure chamber.

Abstract: The invention relates to a transmission (1), in particular set of pulleys therefor, comprising a set of pulleys, in which at least one disc is axially displaceable and provided with cylinder piston means (12), which cylinder/piston means (12) comprise at least one pressure chamber (13) with radial walls and concentric cylinder walls and at least one of said radial walls (18; 24) of the pressure chamber is secured to one of said concentric cylinder walls (20) by means of an immovable fit, and which wall (18; 24) near to said fit is produced with a resiliently hingeable feature, in which the hinging feature is realised with the inclusion of an axially extending sleeve like foot part (30), integral to said wall, and with both axial faces thereof extending uninterrupted smoothly up to the lower end part of the wall.

Abstract: The continuously variable belt transmission is provided with a fixed sheave and a movable sheave provided on a secondary shaft, a first hydraulic chamber that presses the movable sheave in an axial direction, a second hydraulic chamber that gives the movable sheave a pressing force acting in a direction opposite the pressing force given by the first hydraulic chamber, an oil passage connected to the second hydraulic chamber, and an oil receiver disposed along a path from the oil passage to the second hydraulic chamber. The oil receiver is attached to the secondary shaft, a bearing and a bulkhead are disposed on both sides of the oil receiver, an oil passage is provided in the secondary shaft, and a grooved portion provided in the oil receiver connects the second hydraulic chamber and the oil passage.

Abstract: A pressure feed in a shaft (1) of a transmission with a hydraulic or pneumatic control device through which the pressure feed can be acted upon with the pressure medium, with a gearbox (2), in which the shaft (1) is positioned through at least one bearing (3), whereby the gearbox (2) has a bearing bore (4) in the region of the bearing (3) and whereby the bearing (3) is affixed axially in the gearbox (2) using a retaining sheet (5), with a gearbox cover (6) which covers the bearing bore (4) of the gearbox (2) and has feeding bores (7, 8) through which the pressure medium is transmitted from the hydraulic or pneumatic control device to the shaft (1). It is recommended that a pressure line (10) consisting of a tube (11) and a connection piece (12) inseparably connected pressure-tight to the tube be arranged between the hydraulic control device and a feeding bore (8) of the gearbox cover (6) arranged parallel to the shaft (1).

Abstract: A CVT-oil-pressure control apparatus has a primary cylinder provided for a primary pulley, having an oil chamber for applying an oil pressure to the primary pulley and a balance oil chamber for applying a centrifugal oil pressure to the primary pulley in a direction which is reverse of a centrifugal oil pressure generated in the oil chamber; a primary valve for adjusting a primary pressure to be applied to the oil chamber based on a line pressure applied by an oil pump; and a balance oil line that connects a drain port of the primary valve and the balance oil chamber. The oil is supplied from the primary valve to the balance oil chamber through the balance oil line.

Abstract: A hydraulic system of a CVT transmission of a motor vehicle is proposed, which has an oil pump for conveying oil from an oil sump to a variator comprising a first pulley set and a second pulley set. In each case, a valve mechanism is provided for controlling a pressure acting on the pulley set concerned. Between the valve mechanisms associated with the respective pulley sets is arranged a pressure selector valve, whose position determines which of the the valve mechanisms controls a main pressure to be delivered by the oil pump.

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 hydraulic pressure control apparatus has an actuator for controlling an automatic transmission. A case for receiving the actuator is constituted by an upper case, a lower case and a plate interposed between them. The plate is provided with a filter. The filter protects the actuator from foreign matters. The actuator is inserted into the case along the axial direction. The actuator is locked by a rotating operation or fixed by a snap fit. An electric control unit is laminated in parallel to the case regulating an oil passage. The electric control unit is cooled by fluid. The electric control unit has a liquid level sensor in its connector part.

Abstract: An automatic transmission comprises a metal V-belt mechanism 10, which changes the speed ratio of the rotational output from an engine ENG, a forward/reverse direction change mechanism 20, which switches the rotational direction of the ratio-change mechanism, and a forward clutch 30, which actuates the switching operation of the rotational direction performed by the forward/reverse direction-change mechanism. A control system for this transmission comprises a regulator valve 50, which generates a line pressure, a manual valve 80, which is operated in correspondence to the shift lever and switches the supply of the line pressure to the forward clutch, and a drive-range sensor 105, which detects the operation of the manual valve. When the movement of the manual valve to a position where the line pressure is to be supplied to the forward clutch is detected by the drive-range sensor 105, the line pressure, which is adjusted by the regulator valve, is lowered for a predetermined time period.

Abstract: The invention concerns a device in a continuously variable belt transmission system for guiding a conical pulley (3) of a variator on a variator shaft (1). The movable conical pulley (3) is fitted onto two bearing sections (4, 5) of the variation shaft (1). To transfer torque between the movable conical pulley (3) and the variator shaft (1), at least one cylindrical pin (6) is provided, which is fitted into an axial guide groove (7) in the variator shaft (1) and an axial guide groove (8) of the movable conical pulley (3).

Abstract: A continuously variable transmission wherein each of two parallel shafts carries a pulley having a fixed flange and a second flange movable axially of the shaft toward and away from the respective fixed flange. An endless torque transmitting chain or belt is trained over the two pulleys. At least one flange of at least one of the pulleys is assembled of two or more parts which consist of sheet metal and are welded and/or otherwise affixed to each other.

Abstract: A variator for ratio adjustment of a continuously variable chain drive transmission having one variator shaft (1) and one variator pulley (2) supported upon the variator shaft (1) and axially movable by pressurizing a variator pressure chamber (31). The variator shaft (1) has on one end an axial hole (10) through which the variator pressure chamber (31) and a second pressure chamber (8) can be loaded with pressure independent of each other. The pressure is supplied to the variator pressure chamber (31) via a first section (13) of the axial hole (10) and the pressure is supplied to the second pressure chamber (8) via a non-rotating pipe (7) and a second section (15) of the axial hole (10), the pipe (7) is situated within the first hole section (13).

Abstract: An automatic transmission includes a transmission case containing oil, a transmission structure housed in the transmission case, for varying the ratio of rotational speeds between a driving shaft connected to wheels and an engine shaft connected to an engine, a transmission control valve housed in the transmission case, for controlling the transmission structure, and a motor as a driving source for driving the transmission control valve. The motor includes a cover, a motor body having a coil disposed under the cover and formed with a wound conductor, a shaft rotated by an electrical current applied to the coil, and a converting structure for converting the rotational movement of the shaft into linear movement. The motor is fixed to the transmission case so that the motor body is disposed in air.

Abstract: A frictional transmission comprising a pressurizing device for applying an elastic pressurizing force generated by compressing and pressing an elastic member in series by a compression device when a belt is pressed and controlled through the elastic member, a condition detector for obtaining a detected value of the friction force and the revolution number, an operating device for suitably creating the pressurizing force, and a control device for always calculating a deviation between a selected valve and a detected value of the predetermined pressurizing force, the control device achieves both or one of error compensation generated in the elastic member or the belt and strengthening adjustment of the additional function by a programmable control.

Abstract: A hydraulically operated automatic transmission assembly wherein a group of dynamic fluid consumers including a continuously variable transmission or a planetary change-speed transmission and a clutch is regulated by a unit which receives pressurized hydraulic fluid from a pump. The pump further serves to supply fluid to several static consumers, such as a torque converter and one or more cooling and/or lubricating units. The fluid which is supplied to the static consumers is influenced by a hydraulic resistor, such as a diaphragm or a throttle, and the quantity of such fluid is maintained within an acceptable range irrespective of eventual leakage of fluid which is being conveyed to the dynamic consumers and irrespective of pronounced fluctuations in the quantity of fluid being necessary for certain modes of operation of the dynamic consumers.

Abstract: The invention describes a method and a device for controlling a drive train of a motor vehicle with a drive assembly and a continuously variable automatic transmission with a variable speed gear, wherein an electronic control unit for controlling at least the continuously variable automatic transmission and an emergency device are provided, with this unit being activated in the event of failure of the electronic control unit and a constant pressure/force ratio being established in the variable speed gear. Pursuant to the invention, in the event of failure of the electronic control unit the frictional connection between the drive assembly and the continuously variable automatic transmission is interrupted before the emergency driving mode is made available through the emergency device by re-establishing the frictional connection.

Abstract: Methods and apparatus for a vehicle drive control apparatus changes in the transfer torque capacity of a power transfer device according to various states of operation with respect to at least one drive power source. The vehicle drive control apparatus includes a power transfer device that has a variable transfer torque capacity and the drive power sources that rotate a device wheel via the power transfer device. A controller is included that causes a vehicle to selectively run in a variety of run modes that differ in states of operation with respect to at least one of the drive power sources. The controller changes the transfer torque capacity of the power transfer device in accordance with the various run modes. According to the vehicle device control apparatus, a target oil pressure is raised by a predetermined amount when the mode of run is change, or when the vehicle descends in a direction opposite to a vehicle starting direction at the time of a hill climb start.

Abstract: A belt-type CVT is comprised of a driving pulley and a driven pulley each of which has having a transmission piston chamber and a clamp piston chamber. An effective cross sectional area of the driving-side clamp piston chamber is equal to an effective cross sectional area of the driven-side clamp piston chamber. The driving-side clamp piston chamber is fluidly communicated with the driven-side clamp piston chamber through a common passage.

Abstract: In a V-pulley control mechanism for a variable-speed drive of belt type in which driving of a V-pulley of the variable-speed drive of belt type is controlled by a motor, the V-pulley control mechanism is disposed between the motor and the V-pulley and comprises a clutch tightening portion, a clutch mechanism which can be tightened by the clutch tightening portion, and a one-way clutch portion.

Abstract: A control device for controlling a continuously variable cone-pulley transmission has a hydraulic control unit with one or more valves (110) in a hydraulic control unit housing (101) and an electronic control unit (151) with electronic components in an electronic control unit housing (150). The hydraulic control unit and the electronic control unit are connected as one modular unit, and a holding volume (160) for hydraulic fluid is provided between the hydraulic control unit housing (101) and the electronic control unit housing (150).

Abstract: A working oil filter device for a continuously variable transmission including a primary pulley and a secondary pulley, between which a belt is made to run. The filter device comprises: a secondary pressure adjust valve for adjusting the pulley groove width thereof; a clutch pressure adjust valve for adjusting the clutch pressure; and a filter for filtering the working oil. The device can comprise a primary pressure adjust valve is provided, in place of the clutch pressure adjust valve. Further, The device can comprise a lubrication pressure adjust valve and a bypass oil passage for returning a drain oil.

Abstract: A first side-pressure, that is supplied to cylinder 74 of the drive pulley 71 or to cylinder 78 of the driven pulley 75 as pressure determining the transmission torque capacity of continuously variable transmission mechanism 70, is supplied to a frictional engagement element, where it is used as the working hydraulic fluid pressure. The transmission torque capacity of the frictional engagement element is set to be somewhat lower than the transmission torque capacity of the continuously variable transmission mechanism.

Abstract: A forward-speed/reverse-speed changeover mechanism 6, serving as a motive-force connection/disconnection mechanism, is accommodated into a housing member 8 fixed to a casing 1. To the forward-speed/reverse-speed changeover mechanism 6 an input end of a primary shaft 3 is connected. The housing member 8 rotatably supports the primary shaft 3 via a bearing member 11. On an imaginary line intersecting the primary shaft 3 perpendicularly and passing through the bearing member 11, a load-receiving element 1b, 8b is provided between the housing member 8 and the casing 1. The tension of a belt 17 is received by the load-receiving element 1b, 8b. As a result, it is possible to provide a bearing structure of a continuously variable transmission enabling holding the bearing members of the primary and secondary shafts at their regular positions against the tension of the belt and maintaining an optimum belt-alignment, thereby enhancing the durability of the continuously variable transmission.

Abstract: In a mechanism where movement is transferred from one component to another by frictional contact and where the intensity of the frictional contact can be changed by altering the contact pressure, a method for determining the amount of slippage between the component parts uses a measurement of a value that corresponds to the power loss due to friction, also known as power dissipation, which occurs during the transfer of movement between the component parts. In this measurement, the level of power dissipation is determined in dependence on the contact pressure force, and an increase in the amount of the dissipated power that occurs when the contact pressure force decreases is interpreted as slip.

Abstract: The rigidity of a movable pulley half is enhanced by the rigidity of a cylinder fixed to a back surface of the movable pulley half and influences of a controlled hydraulic pressure and a centrifugal hydraulic pressure which are exerted in a hydraulic fluid chamber partitioned in the cylinder. On the other hand, an annular protruding portion having detection teeth for a rotation sensor is formed on a back surface of an outer circumferential portion of a fixed pulley half, whereby the difference in rigidity between both the pulley halves is reduced by the effect of the annular protruding portion to improve the rigidity of the fixed pulley half, thereby making it possible to allow the variation characteristics of a misalignment relative to a drive ration to approach a characteristic set in advance.

Abstract: A torque transmitting mechanism between coaxial first and second rotary parts, at least one of which should be free to move axially relative to the other part, employs two frames at least one of which is resilient. Both frames surround one of the parts (e.g., a shaft for one adjustable pulley of a continuously variable transmission), one of the frames has spaced-apart sections affixed to the first part, and the other frame has spaced-apart sections affixed to the second part (e.g., to one flange of the adjustable pulley). Rivets and/or other suitable fasteners couple the two frames to each other at locations each of which is spaced apart from a section of one of the frames and from a section of the other frame. Each frame can have a polygonal outline with corners which are alternatingly coupled to the other frame and to the respective rotary part. The braces between the corners of each polygonal frame can be profiled to oppose certain types of deformation but to permit other types of deformation.

Abstract: A continuously variable transmission or an analogous torque transmitting system has two rotary members in the form of wheels, gears or pulleys (such as adjustable pulleys) which are rotatable about parallel axes. An endless flexible element in the form of a link chain, pintle chain or belt has arcuate portions trained over the rotary members and elongated reaches or stretches extending between the arcuate portions. At least one of the stretches is at least partially confined in but movable lengthwise relative to an elongated rail or another suitable guide which at least reduces lateral stray movements of the respective stretch. This reduces noise as well as the wear upon the endless flexible element and the rotary members.

Abstract: A torque sensor between a rotary input element driven by an engine and a coaxial output element connected to a continuously variable transmission in the power train of a motor vehicle has a plenum chamber for a supply of hydraulic fluid. The chamber is defined by two coaxial valve members of a pressure reducing valve. One valve member is connected to the output element and is movable axially relative to the other valve member, which rotates with the input element, to change the fluid pressure in the chamber. An inlet opening of the valve serves to connect the chamber with the outlet of a pump which supplies pressurized fluid, and such opening is at least partially exposed in at least one first and sealed in at least one second position of the one valve member.

Abstract: Various configurations of a continuously variable transmission include a drive pulley, a driven pulley and a belt extending therebetween. The drive pulley is generally comprised of a moveable sheave half and a fixed sheave half. The moveable sheave half is freely rotatable relative to the drive shaft and the fixed sheave half. Torque is transferred between the moveable sheave half and the stationary sheave half through the use of a roller bearing and channel race arrangement; however, the roller bearings are freely translatable within the channel races. The continuously variable transmission also features a differential positioned between the two output pulleys and an articulating member positioned between the two input pulleys. These two members operate together to eliminate bucking of the belts caused by differences in driven speeds of the two driven pulleys in a parallel configuration of the variable speed transmission. Additionally, a method of assembling the transmission is also described.

Abstract: The proposal is for a process for controlling a CVT of the bevel-pulley-belt type in which, on the occurrence of a wheel-locking drive situation, a converter bridging clutch is disengaged and at the same time a forward or reverse drive clutch is disengaged. The pressure level of the secondary pulley (3) is hereby raised and the transmission ratio of the CVT is changed in accordance with a predeterminable transmission ratio change and a predeterminable gradient.

Abstract: A shift control apparatus for controlling a continuously variable transmission device including a continuously variable transmission mechanism having rotary elements and operable to transmit a rotary motion of a drive power source of an automotive vehicle to a drive wheel of the automotive vehicle, such that a speed ratio of said mechanism is continuously variable, the shift control apparatus includes a power-transmission-state determining device for determining whether the mechanism is placed in a non-power-transmitting state, a speed-ratio determining device for determining whether the mechanism is placed in a lowest-speed position, a rotation-stop detecting device for determining whether the rotary elements are at rest, and a compulsory-speed-ratio-change implementing device for effecting a compulsory shift-down action of the mechanism toward the lowest-speed position when the mechanism is placed in the non-power-transmitting state while the mechanism is not placed in the lowest-speed position and while th

Abstract: A continuously variable transmission for motor vehicles having a first cone pulley pair and a second cone pulley pair over which runs a belt drive organ. Between the primary pulley (11) and a cover (2) in the transmission housing (1), there is provided for the fluid required to adjust the primary pulley (11), a primary pressure line extending substantially radially toward the center of the rotating primary shaft (12) and from which branches off a lubrication pressure line (8) for the rotating primary shaft (12). The fluid is conveyed between an inner cover (6) and the cover (2).

Abstract: A pressure medium supply arrangement for a CVT transmission has a pump that supplies pressure medium to control cylinders of the CVT transmission in order to change a gear ratio of the CVT transmission. The pump has a high pressure side and a low pressure side. The pump further has a bypass channel connecting the high pressure side and the low pressure side. An electrically controlled control valve arrangement is connected to the pump for opening and closing the bypass channel in order to adjust a conveyed flow of the pump.

Abstract: In a constant-horsepower transmission having a primary pulley, a secondary pulley and a belt extended between the primary and the secondary pulley, a predetermined frictional force acting between the pulley and the belt is secured by an external instruction, and the pulley is capable of automatic alignment and shock absorption to ensure stable power transmission from the belt to the pulley. A first compressing device compresses an elastic device in response to an external instruction, a first pressing device including the elastic device applies a pressure and an elastic force produced by the compressed elastic device to the belt through the pulley. A predetermined frictional force is secured by the pressure and stable power transmission is insured by the elastic force. A first pressure application controller executes a variable pressure application control operation to apply an optional pressure to the belt by displacing or not moving the movable disk of the pulley.

Abstract: An infinitely variable transmission including a torque sensor, wherein torque is transmitted from a rotary input shaft to a rotary output shaft. The transmission includes adjustable sheaves for axial movement on the input and output shafts of the transmission and that are controlled by hydraulic piston and cylinder units. The torque sensor shifts the adjustable sheaves, which are urged towards each other by a force dependent upon the transmitted torque, into frictional engagement with an endless flexible element that drives the output shaft of the transmission. Retaining elements retain the hydraulic piston and cylinder units and adjustable sheaves on the input and output shafts of the transmission in a predetermined axial position when pressure is applied in a first direction during operation of the transmission, and permit the components to be shifted axially in the opposite direction to simplify assembly/disassembly procedures of the transmission and to reduce manufacturing costs.

Abstract: In a continuously variable chain-belt transmission, a ratio-controlling pressure is selectively applied to either one or the other of two pairs of conical disks, while a belt-tightening contact pressure is applied equally in a torque-dependent amount to both disk pairs. A pump pressure generated by a pump is regulated by an offset pressure valve to a pressure level that exceeds the ratio-controlling pressure by a preset amount and at least equals the contact pressure. A current-controlled ratio-controlling valve device directs the ratio-controlling pressure to one or the other of the disk pairs depending on whether the ratio-controlling current is above or below a neutral value. The neutral current value as well as the algorithm describing the functional relationship between the ratio-controlling pressure and the current are continuously updated while the transmission is in use.

Abstract: A belt clamp force regulator is provided for controlling the clamp force exerted on a drive belt in a continuously variable transmission. The regulator seeks to maintain a clamp force greater than that required to transmit the mechanical load consistent with the output of the generator. This ensures that the belt will not slip. However, the controller reduces belt clamp when it can so as to improve the service life of the belt.