Abstract: A vehicle automatic transmission includes a torque converter, and also includes a gear transmission mechanism. This gear transmission mechanism includes a manual range setting valve and a plurality of friction engaging mechanisms. Selective engagement of combinations of these friction engaging mechanisms, when the manual range setting valve is set to a forward range, causes the gear transmission mechanism to provide various forward speed stages. In this anti creep control method, a test is performed as to whether anti creep provision conditions hold, the anti creep provision conditions including whether or not the manual range setting valve is set to a forward range, and whether or not the vehicle is substantially stationary.

Abstract: A vehicle transmission system has an internal lever for changing transmission gears, a select actuator for moving the internal lever to neutral positions N1, N2, N3 in a first direction, a shift actuator for moving the internal lever to 1st-5th gear positions and a reverse position in a second direction substantially normal to the first direction, and a clutch actuator for actuating a clutch. While any one of the actuators is in operation, the pressure of a fluid discharged from the operating actuator is prevented from acting on the select actuator and/or the shift actuator which is not in operation by applying a fluid pressure to the inoperative select actuator and/or the shift actuator to fix the actuator or actuators in a current position against operation, thereby allowing the transmission gears to be changed accurately and smoothly.

Abstract: A robot joint has a support carrying a rotary robot arm. An electric drive motor is mounted on the support and its drive shaft is coupled to the robot arm by harmonic drive-type reduction gears. The reduction gears include an elastically deformable, externally toothed ring whose elliptical shape is rotated by the drive shaft. The externally toothed ring itself is stationary and is firmly connected to the support by a flexible sleeve provided at its free end with a rigid mounting flange. The annular mounting face of the flange and the opposite mounting face on the support is each provided with radial teeth, preferably in the form of Hirth-type gears, which guarantee an accurate centering of the sleeve and safeguard the same against turning. Preferably, the flange is fastened to the end face of a steel bushing which is pressed into a bore in the support and secured against turning by knurled serrations.

Abstract: A drive system for use upon a bicycle including a two speed rear axle 18 including an interior coaster brake 62, 64 driven by a multispeed transmission 12 including a plurality of selective planetary reductions. The drive system incorporates a multiple gear mechanism at the pedal hub combined with a two-speed mechanism at the driving wheel hub.

Abstract: In an automatic transmission having a torque converter, a planetary gear mechanism receiving an output from the torque converter and including brakes and clutches, and a hydraulic pressure circuit for actuating the brakes and clutches. An arrangement is provided for varying servo hydraulic pressure, which is for achieving low gear, in dependence upon vehicle velocity.

Abstract: An improved limited slip differential gear assembly for driving each axle of a pair of coaxially aligned vehicle axles at the same rotational speed or at relatively different rotational speeds as conditions require. The assembly includes an improved externally controllable clutch mechanism for preventing excessive relative rotation of the axles. The amount of the clutch force being applied to resist relative rotation may be varied independently of the relative rotational speed of the axles and also of the torque level in the gear assembly. Preferably the clutch mechanism is incorporated in a planetary wheel type differential and is activated electromagnetically. The clutch mechanism may include a cam operated supplemental clutch device for applying an additional clutch force in response to any continued relative rotation which may occur after the first clutching force has been applied by the electromagnet.

Abstract: A transmission for a vehicle has a shift mechanism, a hydraulic actuator for operating the shift mechanism and a hydraulic control for supplying and discharging working oil to and from the hydraulic actuator to control the shift of the shift mechanism. The hydraulic control includes a flow regulating valve for regulating flow of the working oil supplied to the hydraulic actuator, as a function of pressure of the working oil supplied to the hydraulic actuator.

Abstract: An all-wheel limited slip differential system in the power train of the front axle and the rear axle of a motor vehicle has an intermediate planetary transmission in the direct through drive and a braking device that is engageable at its planetary carrier. A braking member is connected with the planetary carrier and the counterbraking member interacting with it is connected with the output shaft to the rear axle in a torsionally fixed manner. In order to keep the required braking moment and the braking device small, the ratio of the gear to the braking device is significantly higher than the ratio for the direct through drive.

Abstract: An automatic transmission for an automotive vehicle is selectively operable either in a first mode of providing a first, a second next to the first and a third next to the second speed stages, or in a second mode of providing the first and the third speed stages while skipping the second stage. The upshifting from the first speed stage to the second speed stage according to the first mode is effected at a lower vehicle road speed than the upshifting from the first speed stage to the third speed stage according to the second mode for the same load on the engine of the vehicle.

Abstract: An improved strutless synchronizer has an annular spring interposed between an internally splined sleeve, mounted for axial sliding movement on a main shaft, and an associated blocking ring. Selected ones of the sleeve splines are formed at the extremities with radially inwardly extending teeth. Each of the teeth has a dual chamfered face portion in opposed relation with the annular spring. The blocking ring has three equally spaced lugs each formed with a transverse groove sized to axially capture the annular spring so as to allow the spring freedom to rotate in its grooves relative to the blocking ring. Each time the sleeve is moved toward meshed engagement with an associated main shaft ratio gear its spline teeth chamfered faces compress the spring at random points thereby minimizing spring wear. Also, the grooves, by positively retaining the spring, insure instant unloading of the blocking ring.

Abstract: A hydromechanical transmission that can be used as an efficient continuously variable transmission has a pair of speed sensors for detecting the rotational speeds at the transmission ends of two mechanical transfer lines formed in the transmission, a pair of pressure sensors for detecting the pressures at two positions, an actuator, and a computer. The computer controls the actuator and two clutches in such a way that the system is switched from a low-speed mode to a high-speed mode and vice versa without producing a shock.

Abstract: Engine control apparatus for use in passenger cars and other applications includes a special calibration of the engine intake mixture preparation system. Although this calibration duplicates the optimum calibration for use with a continuously variable transmission (CVT), the apparatus instead includes, for reasons of practicality, a discrete-ratio powershift transmission. Also included is a feedback control system which dispenses with the conventional mechanical connection between accelerator pedal and engine throttle valve. This drive-by-wire control system operates the engine as closely as is practical to the optimum CVT engine operating schedule, a predominantly wide-open-throttle engine operating schedule. The overall combination of special engine calibration and drive-by-wire control with a discrete-ratio transmission can offer the majority of the fuel economy advantage available with a CVT.

Abstract: A power transfer device includes a planetary gear unit which includes a sun gear, a carrier, a ring gear, and a plurality of planet gears journaled on the carrier and in mesh with the sun and ring gears. The planetary gear unit is shiftable between first, second and third positions to establish a high speed four-wheel drive mode in the first position wherein the carrier is engaged with an input shaft, and the sun and ring gears are each engaged with a pair of coaxial output shafts to permit differential action between the output shafts.

Abstract: A method wherein control of a desired engine speed occurs during a period when a throttle valve is opened at an upper limit position by an auto drive. Vo is defined as a desired vehicle speed, Vr as an actual vehicle speed, A1 as a positive constant and A2 as another positive constant smaller than A1. When Vo-Vr.gtoreq.A1, the desired engine speed is increased. When Vo-Vr<A2, the desired engine speed is decreased or maintained.

Abstract: A transmission apparatus includes a straight input shaft, a first group of large and small gears rigidly mounted on the input shaft and adapted to turn with the shaft, a straight transmission shaft installed near and parallel to the input shaft; a second group of large and small gears rotatably mounted on the transmission shaft, the sizes of the gears being in opposite relationship with those of the gears in the first group on the input shaft, a third gear rigidly mounted on the transmission shaft, a back gear rotatably mounted on the transmission shaft, partition rings installed between each of the gears in the second group, the third gear, and the back gear with no gap between the partition rings and the gears, and engagement grooves in the second group formed in the internal surface of the gears the third gear and the back gear. The engagement grooves are separated from each other by the partition rings.

Abstract: A gear system has a planetary gear (5) mounted on a conical main shaft (8) in such a manner to move axially thereon, the planetary gear being in meshing engagement with a central gear (3). A receiving device is provided to receive thrust generated at the planetary gear (5). When a plurality of planetary gears (5) are employed, a clearance (S) formed between the surface of the conical main shaft (8) and an inner peripheral surface of a bearing (17) of each planetary gear (5) is changed according to the axial position of each gear (5) on the conical shaft (8) under the influence of a thrust counterbalancing device. Thus, a distance between the center axis of the conical shaft (8) and that of the planetary gear (5) is thereby increased or decreased to effect even application of load to each planetary gear (5).

Abstract: An apparatus for cyclically actuating an actuation member comprises a hollow shaft rotatable about an axis of rotation and defining therein a cam opening therethrough, an inner shaft rotatably carried within the hollow shaft, a cam member fixed to the hollow shaft adjacent the cam opening, a cam member fixed to the inner shaft and projecting through the cam opening of the hollow shaft, a variable transmission having a reference element connected to one of the shafts and an output element connected to the other of the shafts, and an input element; a pulley wheel connected to the shafts for rotating same about the axis, and an electric motor connected to the input element of the variable transmission for rotating same, the electric motor being controlled by an electronic control unit which can include one or more microprocessor units.

Abstract: An engine brake control for a transmission is disclosed. The transmission includes a hydraulically operated clutch selectively establishing a drive connection between a first rotary member and a second rotary member, and a one-way clutch arranged in parallel to the hydraulically operated clutch such that when the hydraulically operated clutch is released the one-way clutch transmits forward torque from the first rotary member to the second rotary member, but interrupts transmission of reverse torque to the first rotary member from the second rotary member. When a driver demands engine brake, a manual selector valve generates an engine brake command fluid pressure.

Abstract: Mechanical rotary drive, preferably a gear reduction drive, particularly for industrial robots, for example a manipulator arm rotary drive, comprising a driving side and a power take-off side, a drive shaft, and at least two gears, preferably reduction gears, situated on the drive shaft and biased against one another, the gear biasing at the driving side being executed via a torsionally stiff coupling and the gear biasing at the power take-off side being executed via a torsionally elastic coupling.

Abstract: An actuator arrangement includes epicyclic gearing having compound planetary gears each of whose pinions respectively mesh with a ring gear on a relatively fixed body and with two output ring gears to drive the latter in opposite directions relative to the body. The pinions which mesh with the ring gear on the body are free to rotate with respect to the remaining pinions and also mesh with a sun gear which is separate from, but driven by, the sun gear which drives the remaining pinions. The arrangement permits the gearing to overcome dimensional restraints imposed by prior art systems.