Abstract: A continuously variable speed transmission wherein an input member is driven by an engine through a torque sensor and the input member drives an output member at a selected RPM through a pair of adjustable sheaves and an endless belt or chain which is trained over the sheaves. Each sheave has a fixed flange and an axially movable flange. The movable flanges can be shifted by hydraulic motors, and the pressure of fluid in such motors is determined by torque which is detected by the sensor as well as by the selected ratio of the transmission. The device which controls the pressure of fluid in the motors in dependency on the magnitude of torque and in dependency on the selected transmission ratio employs a pressure regulating valve which is connected with the torque sensor and with the motors and which is adjustable in automatic response to variations of transmission ratio.

Abstract: A hydraulic control apparatus for controlling a vehicle power transmitting system including a belt-and-pulley type continuously variable transmission and a torque converter provided with a lock-up clutch. The transmission includes a pair of hydraulic actuators one of which receives a belt tensioning pressure for controlling a tension of a transmission belt.

Abstract: A hydraulic control apparatus for a power transmitting system including a continuously variable transmission, a reversing device, and an auxiliary transmission, which apparatus includes: a solenoid valve for generating a pilot pressure for selectively placing the auxiliary transmission in high- and low-gear positions; high-gear and low-gear control valves normally operable based on the pilot pressure, to control high- and low-gear coupling devices of the auxiliary transmission to establish the high- and low-gear positions. The low-gear control valve is operated to engage the low-gear coupling device, when the low-gear control valve receives a pressure to be applied to the reversing device for forward run of the vehicle. The high-gear control valve may be operated to release the high-gear coupling device, when a thrust based on a pressure applied to the low-gear coupling device exceeds a predetermined value.

Abstract: A hydraulic control apparatus for controlling a belt-and-pulley type continuously variable transmission of a motor vehicle having an engine, which transmission includes a pair of hydraulic actuators one of which receives a belt tensioning pressure for controlling a tension of a transmission belt. The hydraulic control apparatus includes an engine-output detecting valve for generating an engine output pressure indicative of a currently required output of the engine, a solenoid-operated valve for regulating a modified engine output pressure based on the engine output pressure generated by the engine-output detecting valve, and a pressure regulating valve for regulating the belt tensioning pressure based on at least the modified output pressure. The modified engine output pressure is obtained so that the belt tensioning pressure is controlled to an optimum level.

Abstract: A continuously variable belt or chain transmission wherein the input shaft carries a first adjustable sheave and the output shaft carries a second adjustable sheave. The axially movable flanges of the sheaves are displaceable toward the associated fixedly mounted flanges by hydraulic cylinder and piston units. The pressure of fluid in such units is regulated by a torque sensor which is a hydrostatic pump installed between a prime mover and the input shaft and further serves as a means for eliminating peaks of transmitted torque and/or as a clutch. A second pump is provided to supply pressurized fluid to one or more additional cylinder and piston units which are used to change the ratio of the transmission. The cylinder and piston unit for the axially movable flange of the sheave on the output shaft can contain a diaphragm spring serving to permanently bias the respective movable flange against an endless belt or chain which is trained over the sheaves.

Abstract: A continuously variable transmission utilizes a cam loading device with a hydraulically controlled CVT of the metal V-belt type. The cam loading device applies an axial loading force to the pulley flanges in proportion to the output torque. A hydraulic mechanism positions the pulley flanges to compensate for the limited axial movement of the cam mechanism. A preload spring and hydraulic cushion provide a necessary preload while cushioning shock from reversal of torque. The loading force on the CVT is permitted to vary with the output torque to provide improved efficiency for a full range of automotive driving conditions.

Abstract: A belt-type continuously variable transmission for use with a motor vehicle engine has a hydraulic actuator for effecting at least one of speed ratio control and clutch control. The belt-type continuously variable transmission is controlled by a control system including a solenoid-operated control valve for generating a controlling hydraulic pressure to be supplied to the hydraulic actuator, a hydraulic pressure generator for generating a hydraulic pressure corresponding to the rotational speed of the engine, a directional control valve for selectively connecting the solenoid-operated control valve and the hydraulic pressure generating means to the hydraulic actuator, and a solenoid-operated on-off valve for controlling the directional control valve.

Abstract: A continuously variable transmission includes an improved secondary servo arrangement in order to provide the necessary clamping forces for high torque conditions. The secondary servo includes a plurality of fluid chambers in order to allow an increase in the area for application of fluid pressure. Fluid conduits between the chambers permit communication of the fluid to the chambers to regulate the clamping force of the movable sheaves of the secondary variable pulleys.

Abstract: Device for the regulation of an automatic transmission unit, in particular a transmission unit composed of a torque converter, a foreward coupling, a reverse coupling and a continuously variable transmission, characterized in that this device consists of a pump; a first regulating valve for the regulation of the continuously variable transmission; a second regulating valve with which a hydraulic medium for the torque converter can be controlled; a cut-off valve; and control means which supply a regulating pressure which can provide in the control of both the cut-off valve and the second regulating valve.

Abstract: A revolution speed controller for a continuously variable speed transmission has an air cylinder unit for operating a speed-control section of the transmission, and a command pressure chamber partly defined by a diaphragm operable in response to a command air pressure. The diaphragm and the air cylinder unit are connected by a resilient member. A valve member is movable in response to operation of the diaphragm to connect or disconnect a working air pressure source to or from the interior of the air cylinder unit and to disconnect or connect the interior of the air cylinder unit from or to the atmosphere. When the pressure in the command pressure chamber is balanced with a force exerted to the diaphragm by the resilient member, the valve member cuts off the supply of the working air pressure to the air cylinder unit and also interrupts the communication between the air cylinder unit and the atmosphere.

Abstract: A hydraulic control apparatus for a vehicle continuously variable transmission including a pressure regulating valve having a valve spool which operates depending upon a determined current speed ratio of the transmission and a currently detected required output of the vehicle engine, to generate a controlled belt tensioning pressure for controlling the tension of a transmission belt at a required minimum level. The apparatus further includes a device responsive to an electric signal, for generating a pilot pressure to be applied to the valve, and an electronic control device for calculating a basic output pressure of the valve, based on the current speed ratio and the currently required output, according to a stored predetermined relationship among these two parameters and the basic output pressure, to determine the electric signal so that the belt tensioning pressure coincides with the optimum value.

Abstract: According to a gear shift control system of a continuous transmission of the present invention, when the gear ratio is controlled to a target gear ratio, a deviation between an actual primary pulley speed and the target primary pulley speed is detected. When a feedback-control is carried out to control the actual primary pulley speed to the target primary pulley speed on the basis of the above deviation, the control gain(s) is changed according to the deviation between the actual and the target primary pulley speeds at changing the gear ratio. Thus, the gear ratio is changed at the constant speed and better gear characteristics can be gained. Moreover, the hunting of the actual primary pulley speed occurred around the target speed can be prevented.

Abstract: A centrifugal oil pressure control arrangement for a continuously variable transmission includes an oil pressure chamber connected to a sheave member, a centrifugal oil pressure correction chamber connected to the opposite side of the oil pressure chamber with respect to the sheave member, and a cylinder connected to the sheave. A piston is disposed fixedly in the cylinder and defines the oil pressure chamber and the centrifugal oil pressure chamber by the piston. A first opening formed on the piston and the oil pressure chamber is communicated with the centrifugal oil pressure chamber by the first opening. The centrifugal oil pressure control arrangement includes the cylinder having a main cylinder and a sub-cylinder. The main cylinder is connected to the sheave and slidably moved on the main cylinder. The sub-cylinder is fixedly connected to the shaft and has a second opening communicated between the centrifugal oil pressure chamber and a casing.

Abstract: A continuously variable transmission provided with a primary pulley mounted on a primary shaft and a secondary pulley mounted on a secondary shaft. A transmission is passed over said pulleys. Both the primary pulley and the secondary pulley comprise a pair of discs. At least one of said discs is axially movable by a hydraulic cylinder, so as to adjust the position of the transmission around the pulleys and thus the transmission ratio of the transmission. The pump for providing fluid for said hydraulic cylinders has a regulable delivery, so as to enhance the transmission efficiency.

Abstract: A transmission ratio control device for a controllable, continually variable V-belt transmission for motor vehicles includes a primary hydraulic line carrying the clamping pressure for the V-belt from the primary pressure chamber, a check valve opening against the pressure in the primary pressure chamber, a secondary hydraulic line carrying the clamping pressure for the V-belt from the secondary pressure chamber, and a second check valve opening against the pressure in the secondary pressure chamber. An adjustable pump is installed in a line connecting the first line, between the primary pressure chamber and the first check valve, to the second line, between the secondary pressure chamber and the secondary check valve. The adjustable pump is dependent on a control signal to control the continually variable gear ratio by pumping hydraulic fluid between the primary pressure chamber and the secondary pressure chamber.

Abstract: A method of controlling speed reduction ratio in a continuously variable speed transmission comprises the steps of setting a prescribed parameter corresponding an accelerator opening which is opened to a certain extent from a fully closed condition setting a reference engine speed corresponding to a parameter which represents a driver's intention of acceleration so as to increase as said parameter increase from said prescribed parameter when said parameter is in a range higher than said prescribed parameter setting said reference engine speed so as to increase as said parameter decreases from said prescribed parameter when said parameter is in a range lower than said prescribed parameter, and controlling said speed reduction ratio so that the engine speed coincides with said reference engine speed.

Abstract: A hydraulic control control apparatus for controlling a speed ratio of a vehicle continuously variable transmission, which includes a device for producing a first pressure varying with the input shaft speed of the transmission, a device for producing a second pressure varying with the currently required output of the vehicle engine, a device for producing a third pressure varying with the vehicle speed, such that a rate of increase in the third pressure is limited after the vehicle speed pressure reaches a predetermined upper limit which varies with the second pressure, and a shift control valve device including a valve spool operated to control the hydraulic actuator for changing the speed ratio so as to shift-down the transmission, in relation to an increase in the second pressure and an increase in the vehicle speed pressure, and changing the speed ratio so as to shift-up the transmission, in relation to an increase in the first speed pressure.

Abstract: An automatic transmission includes a gear power train and a V-belt type continuously variable power train which are connected in parallel between input and output shafts. A relatively low hydraulic fluid pressure is supplied to a follower pulley cylinder chamber when the V-belt type continuously variable power train is rendered inoperable, whereas a sufficiently high hydraulic fluid pressure is supplied to the follower pulley cylinder chamber when the V-belt type continuously variable power train is rendered operable, inducing a sufficiently high force which the follower pulley grips the V-belt with.

Abstract: A hybrid transmission includes a gearing mechanism and a V-belt type continuously variable transmission mechanism, a shift command valve, a shift control valve, and a high clutch. The continuously variable transmission mechanism has a driver pulley connected to receive a hydraulic fluid pressure generated by the shift control valve. A neutral valve is fluidly disposed between the high clutch and the shift control valve and has a drain port. The neutral valve takes a predetermined position upon the shift command valve assuming an overstroke range position to drain the high clutch via the drain port thereof, causing the high clutch to be released quickly. The shift command valve assumes the overstroke range position upon kickdown operation, for example. Thus, improved kickdown operation is provided owing to the quick release of the high clutch.

Abstract: A control unit of a CVT is provided to produce a basic exciting current for the dither exciting current fed to a solenoid of the solenoid operated control valve. A dither is added to the basic exciting current for producing the dither exciting current. A positive deviation and a negative deviation of the dither exciting current from the basic exciting current in one cycle of the dither is integrated for producing integrals. A correction value which renders the sum of said integrals zero is produced. The correction value is added to the dither so that a corrected dither exciting current is produced.

Abstract: A belt-type continuously variable transmission consisting of: an input/drive shaft with a rotational axis; an output/driven shaft with a rotational axis; a first variable speed pulley on the input/drive shaft and having a first pulley part fixed against axial movement relative to the input/drive shaft and a second pulley part movable axially relative to the first pulley part, with the first and second pulley parts cooperatively defining a belt-receiving groove; a second variable-speed pulley on the output/driven shaft and having a third pulley part fixed against axial movement relative to the output/driven shaft and a fourth pulley part movable axially relative to the third pulley part, with the third and fourth pulley parts cooperatively defining a belt-receiving groove; a fluid cylinder; structure for shifting the second pulley part axially relative to the first pulley part in response to a change in pressure in the fluid cylinder; a fluid reservoir on the first variable-speed pulley for rotation with the i

Abstract: A continously variable transmission has a fixed pulley piece and has a movable pulley piece which is supported for movement toward and away from the fixed pulley piece, the width of a groove between the pulley pieces being increased or decreased in order to increase or decrease the radius of rotation of a belt looped around a driving side pulley and a driven side pulley which include the fixed and movable pulley pieces to thereby vary a belt ratio. A hydraulic clutch is engaged and disengaged under control of a clutch pressure in order to vary a driving force output by the continuously variable transmission, and a control arrangement controls and hydraulic clutch so that creep caused by slippage of the hydraulic clutch in a hold mode during a reverse gear operation of the continuously variable transmission is larger than creep caused by slippage of the hydraulic clutch in a hold mode during forward gear operation of the continuously variable transmission.

Abstract: A continuously variable belt drive transmission has a torque converter with a lockup clutch. The lockup clutch is engaged in accordance with conditions of an engine and the transmission. Torque of the torque converter is estimated based on engine operating conditions and transmission conditions, and torque of the lockup clutch is estimated based on engine operating conditions and detected transmission conditions. The estimated converter torque and the estimated clutch torque are compared with each other for determining larger torque. The lockup clutch is disengaged when the estimated converter torque is larger than the estimated lockup clutch torque.

Abstract: A hydraulic control apparatus for a power transmitting system for an automotive vehicle having a continuously variable transmission which has a first and a second shaft, a pair of variable-diameter pulleys provided on the first and second shafts, a belt connecting the pulleys, and a pair of hydraulic actuators for changing diameters of the pulleys, wherein a tension of the belt is controlled by regulating an actuating pressure in a driven side actuator of the hydraulic actuators which is provided on a driven one of the two shafts. The apparatus includes a pressure regulating valve which has a valve spool for regulating the actuating pressure in the driven side actuator, and a pressure-reducing chamber for receiving a pressure-reducing pilot pressure for biasing the spool for reducing the actuating pressure.

Abstract: A continuously variable speed transmission with parallel rotary input and output shaft which respectively carry first and second adjustable sheaves for an endless belt or chain. Each sheave has a first flange which is affixed to the respective shaft and a second flange which is movable axially of the respective shaft toward and away from the adjacent first sheave. A first cylinder and piston unit can receive hydraulic fluid from a first pump to urge the second flange of the first sheave against the adjacent portion of the belt or chain, and the same pump supplies fluid to a second cylinder and piston unit which urges the second flange of the second sheave against the adjacent portion of the belt or chain. A second pump serves to supply hydraulic fluid to a third cylinder and piston unit which is located radially inwardly of the first unit and is operable to change the transmission ratio.

Abstract: A control system for controlling hydraulic pressure in a dual pass continuously variable transmission includes a pump to provide primary and secondary hydraulic pressures for regulating the pulley ratio and belt tension. A minicomputer regulates the primary and secondary pressures, and a transition mechanism alternates the paths of the primary and secondary pressures between first and second pulleys of the transmission so that the primary pressure is fed to the drive pulley and the secondary pressure is fed to the driven pulley.

Abstract: A continuously variable non-stage transmission for a vehicle includes a pair of pulleys with a belt wound around them, and an arrangement cooperable with the pulleys for varying the radius of gyration of the belt. A fluid coupling, a reverse drive brake, a neutral clutch, and one of the pulleys are positioned in a row beginning at the vehicle engine and extending along a rotatable shaft. The fluid coupling includes a pump impeller, a turbine runner, and a stator wheel which is lockable against rotation by the brake to provide reverse rotation of the turbine runner. A direct clutch is built into the fluid coupling and prevents cavitation in the fluid coupling. An operating mechanism of the brake is fitted in a hollow cavity in the case of the transmission. The cavity is formed by a retaining portion of the transmission case, which retaining portion supports a bearing of the rotatable shaft.

Abstract: In a continuously variable transmission with a pulley having discs (1, 2) wherebetween a driving belt (12) runs, at least one of the discs is movable for influencing the transmission ratio of the transmission. The moveable disc (1; 2) being mounted on a shaft (3), by support members (5; 7; 16, 18; 20, 21) possibly formed eccentrically relative to the shaft (3).The support members take up the forces exerted by the driving belt (12) close to the point of application of the forces, so that in particular the movable pulley disc may be constructed less rigid, with a smaller mass and at a reduced cost price.

Abstract: A hydraulic control apparatus for a vehicle power transmitting system having a continuously variable transmission having a first and a second shaft, a pair of variable-diameter pulleys provided on the shafts, a belt connecting the pulleys, and two hydraulic actuators for changing diameters of the pulleys.

Abstract: A controlling method of a four wheel drive vehicle includes a detecting step and a controlling step. The detecting step detects difference in speeds between a front driving shaft and a rear driving shaft. The controlling step controls an apparatus for controlling a distribution ratio of driving torque of the four wheel drive vehicle so as to harmonize the difference in the speeds with a desired value.

Abstract: A pressure transducer, which senses clutch pressure and effects closed loop clutch control in a continuously variable transmission, is used after the clutch is fully engaged to provide closed loop line pressure control to a desired setpoint, which line pressure regulates the tension on the belt in the transmission. Only a single transducer is needed since there is a known relationship between the clutch and line pressures when the clutch is locked up. Prior to lockup, the line pressure is governed by an open loop controller which establishes the line pressure at a level higher than that called for by the setpoint. This ensures that the line pressure will be high enough to provide the required tension on the belt so that it will not slip. After the clutch is engaged, the closed loop line pressure controller (which includes both the open loop line pressure controller and the closed loop clutch controller) establishes the line pressure at the setpoint.

Abstract: A continuously variable transmission has a drive pulley having a shiftable disc, a driven pulley having a shiftable disc, a belt engaged with both pulleys, a transmission ratio control valve having a plunger slidably mounted in a valve body, a spool for controlling transmission ratio and, a spring provided between the plunger and the spool. A selector device is provided for selecting a high engine speed driving range. The selector device has an actuator responsive to the selection of the high engine speed driving range for shifting the plunger to increase the load on the spring, and a correcting lever for controlling the operation of the actuator in accordance with the transmission ratio.

Abstract: A continuously variable belt transmission of the type comprising: primary and secondary pulleys, each of which comprises a pair of axially opposed sheaves supported on a shaft, one of the sheaves being movable and the other being fixed; a belt wound around these pulleys; a pressure adjusting mechanism for imparting to at least one of these pulleys an axial force which corresponds to torque transmitted; and mechanical actuators for axially shifting the movable sheaves of these pulleys, wherein: first thrust bearings are respectively interposed between the backsides of the movable sheaves and one ends of the mechanical actuators; a first automatic aligning mechanism is provided for supporting at least one of the races of each the first thrust bearing; and axial forces occurring at the pulleys are carried by the shafts directly, or via the first thrust bearings, the first automatic aligning mechanisms and the mechanical actuators, or via the pressure adjusting mechanism.

Abstract: There is shown a hydraulic control system for a transmission of the type wherein a gearing mechanism is combined with a V-belt type continuously variable transmission mechanism. The system comprises a hydraulic arrangement wherein a hydraulic fluid pressure supplied to a pulley cylinder chamber which the tension of the V-belt is variable with. The level of the hydraulic fluid pressure is elevated or increased immediately before or during shifting from the torque transmission through the gearing mechanism to the torque transmission through the V-belt type continuously variable transmission mechanism.

Abstract: In a part-time (selective) four-wheel-drive vehicle, the engine driving power is selectively transmitted to the rear (or front) wheels by way of a transfer clutch which is operated by a hydraulic actuator acting through a rail and a sleeve of the dog clutch and being controllable by a changeover valve operated by a solenoid which is controlled by a four-wheel-drive switch manipulative by the driver.

Abstract: A continuously variable transmission has a drive pulley, a driven pulley, a belt engaged with both pulleys, a transmission ratio control valve having a spool for controlling oil supplied and drained to and from a cylinder of the drive pulley. A check valve is provided in a drain passage for the drain oil. The check valve has a drain port and a spool provided for closing the drain port. A shift lock device is provided to shift the spool so as to close the drain port when wheels of a vehicle are locked, thereby preventing the belt and pulleys from shifting to a larger transmission ratio position.

Abstract: In an infinitely variable transmission with discs (1, 2) the movable disc (2) is connected to a cylinder wall (11), which together with a piston (3) encloses a fluid filled cylinder space (4). A sealing ring (6, 15, 17) provides one or more calibrated openings (14, 16) between the piston and the cylinder wall, so that as a result of the continuous relative movement, between the piston with sealing ring and the cylinder wall, during actuation of the transmission the calibrated openings are automatically scraped clean.

Abstract: To provide for rapid response of a fluid pressure element pressing conical disks towards each other, to prevent slippage of a belt (25) between the conical faces of the conical disks (3, 3', 4, 4') upon abrupt changes in torque being transmitted to the driving shaft (1; 51, 52); additional fluid supply lines (23, 24; 73, 74) with check valves therein (21, 22; 71, 72) are connected between the torque sensor (19; 69, 70) and the connecting line (11, 12; 61, 62) extending between a control valve (10; 50) and the fluid pressure arrangement, typically a cylinder-piston arrangement (5, 7, 8, 6, 9), providing axial pressure of the movable one of the conical disks, the check valves having a fluid path direction from the pressure source--torque sensor line (18; 65, 75, 218) to the control valve (10, 50)--fluid pressure arrangement line (11, 12; 61, 62) and bypassing the control valve (10; 50).

Abstract: A device for transmitting the position of a drivebelt pulley of a continually variable automatic transmission to a valve arrangement includes a lever assembly extending between the valve and a variable displacement abutment connected to a sensor foot contacting the pulley. The position of the sensor foot is displaceable on an axial guide rod according to the position of a threaded bushing. The position of the pedal is adjustable from outside the transmission housing by rotating a tool that turns a setting sleeve rotatably fixed to the guide rod. As the guide rod turns, the bushing, engaged with threads on the sensor foot, changes the position of the abutment contacted by the lever assembly.

Abstract: A control system for a continuously variable transmission for a motor vehicle has a transmission ratio control valve for controlling the transmission ratio. The system has a drive pulley having a shiftable disc and a hydraulic cylinder for operating the disc, a driven pulley having a shiftable disc and a hydraulic cylinder for operating the disc, a belt engaged with both pulleys. When output torque of an automotive engine increases, the transmission ratio control valve is operated to increase pressure of oil supplied to the cylinder of the drive pulley, thereby preventing the transmission from downshifting.

Abstract: A continuously variable transmission comprises a V-belt tensioned between a driver pulley and a follower pulley. Hydraulic fluid pressure that determines a gripping force which the driver pulley grips the V-belt with is reduced upon detecting a demand for engine brake running of a motor vehicle, whereby a good engine brake feel is assured during transient period to the engine brake running.

Abstract: A speed ratio of a continuously variable transmission is controlled by varying the effective diameters of drive and driven pulleys mounted respectively on input and output shafts with a V-belt trained around the drive and driven pulleys. The effective diameter of the drive pulley is increased based on a signal proportional to a vehicle speed and reduced based on a signal proportional to a throttle valve opening degree and a signal proportional to a speed ratio.

Abstract: A control method controls a belt-and-pulley type continuously variable transmission having drive and driven pulleys mounted respectively on input and output shafts, a V-belt trained around the drive and driven pulleys, and an oil pressure source and an oil reservoir operatively coupled to first and second hydraulic pressure chambers for axially moving the movable conical members of the drive and driven pulleys to vary effective diameters of the drive and driven pulleys for thereby controlling a speed ratio. The movable conical members of the driver and driven pulleys are movable in synchronism with each other. The hydraulic pressure chamber of one of the driver and driven pulleys, the effective diameter of which is to become larger at that time, is first brought into communication with the oil pressure source.

Abstract: A control system for a transmission is disclosed. The control system includes a high clutch and a low clutch. When the high clutch is engaged, the torque transmission path through a V-belt type continuously variable transmission mechanism is established, while when the low clutch is engaged, the torque transmission path through a gearing mechanism is established. The same hydraulic fluid pressure as prevailing in a driver pulley cylinder chamber is admitted to the high clutch directly or via a suitable selector valve (a neutral valve).

Abstract: A V-pulley to be used in a belt type continuously variable transmission, which V-pulley comprises a stationary pulley half fixedly mounted to a transmission shaft and a movable pulley half coupled slidably to the shaft via a plurality of rows of ball keys and cooperating with the stationary half to support a V-belt. A plurality of coil springs resiliently biasing the movable half toward the stationary half too impart an initial tension to the V-belt. A hydraulic operating device includes a first hydraulic member fixedly mounted to the shaft and a second hydraulic member disposed on the movable pulley half to define a hydraulic chamber against the first member for operating the movable half by hydraulic pressure fed to the hydraulic chamber. A control valve for controlling the pressure supply to the device.

Abstract: Rotation speed of automotive auxiliary machines is controlled by a drive pulley provided on a crank shaft and a driven pulley communicating with the drive pulley through a V-belt. The drive pulley comprises a rigid pulley secured on a drive shaft, a guide holder to be rotated together with the drive shaft by a mount bolt, and a slide pulley axially-movably located between the guide holder and the rigid pulley. The slide pulley provides a power piston to be moved along a guide holder shaft. The power piston, the guide holder flange, and the slide pulley define a power piston chamber.Inside of the power piston chamber are located a flyweight to be moved by centrifugal force and a servo valve to be axially moved by the flyweight. The servo valve is fitted on the outer peripheral surface of the power piston.

Abstract: A hydraulic pressure controller is provided between a hydraulic actuator for changing the effective radii of a drive V-pulley mounted on an input shaft and a driven V-pulley mounted on an output shaft and a hydraulic pump is provided for supplying hydraulic pressure to the hydraulic actuator. The hydraulic pressure controller is controlled by an input torque sensor and a speed change ratio sensor, whereby the hydraulic pressure supplied to the hydraulic actuator is automatically controlled in proportion to the input torque received by the input shaft and the speed change ratio between the input and output shafts.

Abstract: A continuous speed variator including two sets of hydraulically-controlled expandable driving-driven pulleys on parallel shafts with respective driving belts arranged in parallel. The movable parts of the driving pulleys are telescopically mounted on a drive shaft and define a common hydraulic actuating chamber.

Abstract: A belt-and-pulley continuously variable transmission comprises a driver pulley mounted on an input shaft and comprising a fixed conical member and a movable conical member, a driven pulley mounted on an output shaft and comprising a fixed conical member and a movable conical member, and a V-belt trained around the driver and driven pulleys. The movable conical members are axially movable to vary the effective diameters of the driver and driven pulleys for controlling the transmission ratio. The movable conical members are disposed on opposite sides of the V-belt. The transmission further includes a main servomechanism operatively coupled to the movable conical members for controlling axial movement of the movable conical members.

Abstract: A control system for an infinitely variable belt-drive transmission which has a drive pulley having a hydraulically shiftable disc and a servo chamber for shifting the disc, a driven pulley having a hydraulically shiftable disc and a servo chamber for shifting the disc, and a belt engaged with both the pulleys. A hydraulic control circuit is provided for supplying oil to the servo chambers and for draining the servo chambers. A lubricating oil circuit is provided in the hydraulic control circuit for supplying lubricating oil to the drive pulley, and a passage is provided for supplying a part of the lubricating oil to the servo chamber of the drive pulley, thereby filling the servo chamber with the oil before the starting of transmission operation.