Abstract: A differential gear has a housing which is rotatably driven and which contains the shafts of differential planet wheels for rotation with the housing. The planet wheels are freely rotatable per se and are associated with meshing side wheels rotatably journalled relative to the housing and rotatably connected with a respective shaft which is rotatable relative to the housing.

Abstract: A control system for a continuously variable transmission has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The transmission ratio control valve has chamber at both ends of the spool. By controlling the flow rate of oil supplied to the chambers in accordance with a desired transmission ratio, the spool is shifted, so that the rate of change of the transmission ratio is controlled. The transmission ratio changing rate is corrected by the rate of change of the desired transmission ratio. Two coefficients representative of the degree of throttle opening and a physical condition such as viscosity are also generated to correct the transmission ratio changing rate.

Abstract: A method and apparatus for controlling line pressure of a belt-type continuously variable transmission system. The apparatus controls line pressure by raising it by a specific amount in the presence of predetermined conditions when slipping of a clutch is detected during the drive mode of the system so that optimum clutch engagement can eventually be implemented.

Abstract: Holding device for holding the selector gear servo valve in the reverse position when the manual valve is in the neutral or parking position and when the manual valve is moved to a forward position, hydraulic pressure in the servo valve overcomes the holding to move the servo valve to a forward position. Additionally, a control valve is provided for binding the servo valve in the reverse position even when the manual valve is moved to the forward position until hydraulic pressure of the hydraulic clutch for the second transmission train reaches a predetermined level.

Abstract: A housing support for a hydraulic displacement unit swashplate wherein the swashplate extends across the split line between a two-part housing for the hydraulic displacement unit. The housing support is provided by a support surface formed on one housing part and which has extensions thereof extending beyond the housing part. These extensions protrude into the other housing part when the two housing parts are assembled together at the abutting split line. These surface extensions are preferably in the form of a pair of fingers which are spaced from each other to straddle a bearing positioned in a bearing cavity formed in the two housing parts. This enables the fingers to be of sufficient structural section to withstand the hydraulic forces imposed on the part of the swashplate supported thereby.

Abstract: A throttle presure and a modified throttle pressure which is higher than the throttle pressure are developed and the spool of the 2-3 shift valve arranged to be biased toward its downshift position by the throttle pressure when in its upshift position and toward its downshift position by the modified throttle pressure when in its downshift position. The difference between the throttle pressure and the modified throttle pressure is arranged to increase as the level of the throttle pressure decreases.

Abstract: A single sequence valve is connected to a 3-4 shift valve thereby defining a drain circuit. The sequence valve is responsive to hydraulic pressures which act on a fourth speed apply chamber of a band brake and a high clutch, respectively. The sequence valve normally defines the drain circuit, but delivers hydraulic fluid to the 3-4 shift valve, then to the fourth speed apply chamber of the band brake after a command for a 4-2 downshift has taken place until the hydraulic pressure in the high clutch drops to a predetermined value.

Abstract: The transmission ratio of an automotive continuously variable transmission is controlled on the basis of the difference between a target rotational speed of the engine which is preset according to an indication of the driver's intention of acceleration or deceleration and a detected rotational speed of the engine. The gain of the rate of change of the transmission ratio is reduced as the detected rotational speed of the engine becomes higher, and the gain of the rate of change of the transmission ratio is increased as the detected rotational speed of the engine becomes lower. Alternatively, the gain of the rate of change of the transmission ratio is of a relatively small value when the detected rotational speed of the engine is equal to or higher than a preset speed, and the gain of the rate of change of the transmission ratio is of a relatively large value when the detected rotational speed of the engine is lower than said preset speed.

Abstract: The present invention is utilized for demountable securing a power take-off ring gear to the clutch drum on the clutch housing of a vehicular transmission. Specifically, a mounting sleeve releasably secures the power take-off ring to the clutch drum. The mounting sleeve has a generally annular body portion configured as an alternating series of circumferentially spaced, radially outer, crown plate portions and circumferentially spaced, root plate portions displaced radially inwardly with respect to the crown plate portions. The crown plate portions and the root plate portions are connected to each other by a series of substantially radially oriented web walls to present a circumferentially extending, corrugated configuration to the mounting sleeve, and the corrugated configuration operatively effects the driving engagement between the sleeve and the clutch drum. A series of first locking dogs extend radially inwardly from at least selected crown plate portions.

Abstract: A power transmission has a torque converter, a planetary gear arrangement and a variable ratio drive belt. The planetary gear arrangement is controlled to establish a low forward ratio and a reverse ratio. The variable ratio belt drive is controlled to provide a variable ratio high speed range. A torque converter is utilized during the low forward ratio and the reverse ratio and is selectively bypassed during the high speed range.

Abstract: A drive control apparatus of an automatic transmission device for use in automotive vehicles including a shift actuator and a select actuator comprising a pair of fluid pressure actuators capable of displacing a shift lever in right-angled two directions of a shift direction and a select direction, a piston rod and a detection rod capable of being displaced for an equal amount with respect to each other by a working fluid which is to be supplied and discharged to and from the actuators, a plurality of electromagnetic valves for supplying and discharging a working fluid to and from the actuators according to a control signal, a position switch for withdrawably engaging in a detection groove formed in an outer periphery of the detection rod and, when engaged, detaining the piston rod and detecting a control reference position of the actuators and outputting a detection signal thereof, a stroke sensor for continuously detecting displacement of the piston rod through the detection rod and an outputting a detectio

Abstract: A hydraulically operated continuously variable automotive transmission includes a transmission ratio controlling member and a hydraulic actuator operatively coupled to the transmission ratio controlling member for continuously operating the transmission ratio controlling member to increase or reduce the transmission ratio of the continuously variable automotive transmission. A control valve is provided for applying a controlling hydraulic pressure to the hydraulic actuator dependent on the difference between a first control force commensurate with an indication of the automobile driver's intention of acceleration or deceleration and a second force commensurate with the engine rotational speed, in order to change the direction in which the hydraulic actuator is operated.

Abstract: A reverse shift control device of an automatic transmission prevents reverse running of the automatic transmission, even though a manual shift lever is set to a reverse range, when the vehicle runs at more than a predetermined speed. Certain shift valves have ports to which line pressure is applied from the manual valve when set to reverse, and also have ports which communicate with a hydraulic servo of a frictional engaging component which is engaged when the vehicle travels in reverse. When the manual valve is set to reverse and the vehicle speed is more than a predetermined speed (for example, 7 km/h), respective pairs of the ports are disconnected due to the shifting of the shift valves based on the signal issued by a controller.

Abstract: A control system for a continuously variable transmission for a motor vehicle has a line pressure control valve and a transmission ratio control valve, each having a spool for controlling oil supplied to a cylinder of a pulley. The transmission ratio control valve has chambers at both ends of the spool. The flow rate of oil supplied to the chambers is controlled by an on-off valve at duty ratio in accordance with a desired transmission ratio so that the spool is shifted, so that the transmission ratio changing speed is controlled. The duty ratio is corrected by line pressure, so that the transmission ratio is controlled in accordance with the line pressure.

Abstract: A sequence valve is interposed between the manual valve and the reverse clutch and arranged to control the communication therebetween. The valve is responsive to the pressure which develops in the low and reverse brake and establishes communication between the manual valve and the reverse clutch when the pressure prevailing in the low and reverse brake is such as to indicate that the brake is engaged to a predetermined degree.

Abstract: An accumulator which is pressurized during the engagement of the band brake, is arranged with a one-way valve so that the discharge therefrom, which accompanies the downshifting of an associated shift valve, temporarily maintains a pressure which is supplied to an overrunning clutch control valve and which holds the spool valve elements therein in a position wherein the overrunning clutch is drained.

Abstract: A fluid actuated switch valve is provided in a four-speed transmission to direct fluid flow between solenoid-actuated valves and a clutch apply piston in a low gear position and in a high gear position, while allowing one of the solenoid-actuated valves to also direct fluid flow to the lock-up piston of a torque converter in the high gear position.

Abstract: An automatic transmission comprising a single planetary gear unit and a dual planetary gear unit has an output member located in its center so that the output member encloses an input shaft.In the case of a three speed automatic transmission mechanism, a first clutch located around a ring gear of the single planetary gear unit connects the input shaft to this ring gear.In the case of a four speed automatic transmission mechanism, a third clutch which actuates overdrive is additionally located axially outside the first clutch for connecting the input member to a ring gear of the dual planetary gear unit.A sun gear common to both planetary units is connected to the input shaft by a second clutch. This clutch has a drum portion upon which a band may act to brake the sun gear.

Abstract: This invention involves a gear transmission mechanism and its device which incorporate double cycloidal equidistant conjugated gear mechanisms and devices, featuring in that a whole branch cyclic cycloidal equidistant curve at a side of the center of curvature of that cycloid is applied with the value of equidistance equal to or smaller than the radius of the rolling circle as the original tooth profile and thus conjugated mutually enveloping cycloidal equidistant curved gear mechanisms with one-tooth-difference, zero-tooth-difference or multi-tooth-difference can be made according to the requirement. Motor pumps and reducers made according to these mechanisms have the advantages of smaller sliding coefficient, smaller pressure angle, greater speed ratio range, lower noise, better strength, higher efficiency, more convenience in machining and lower cost. Therefore these mechanisms can be used to effectively replace the cycloidal lantern gearing with promising development of novel gear transmissions.

Abstract: A stepless speed change device has an input shaft and an output shaft. The device inlcudes a planetary carrier proviced at an inner end of the input shaft, a sun gear provided at an inner end of the output shaft to be in mesh with planet gears carried on the planetary carrier, and an internal gear in mesh with the planet gears to form a planetary gear. The device further includes a driven rotor rotatable about the input shaft and in the form of a hollow cylinder having flanges at both ends and concentrically connected to the internal gear, a driving rotor enclosing the driven rotor and including two members connected to the input shaft on both sides of the driven rotor, and an intermediate friction transmission ring whose eccentricity is adjustable and interposed between the flanges of the driven rotor and between the two members of the driving rotor for transmitting rotating power therebetween.