Abstract: Described herein is a hydraulic servo drum which is compact in construction and defines an appropriate area for a piston, the servo drum including: an annular plate member having a press-formed cylindrical portion around the outer periphery thereof; an intermediate cylinder member having one end thereof fitted on the cylindrical portion of the annular plate member and formed with a spline in the remaining portions; and an outer cylinder member provided with a folded portion at one end thereof and having the inner periphery of the folded portion connected to the intermediate cylinder member.

Abstract: A hydraulic control system for an automatic transmission has an inhibitor valve which comprises a change-over valve having a first set position and a second set position and functioning to supply and discharge a hydraulic pressure to and from a hydraulic servomechanism for a friction engaging element through its movement between the first and second set positions; an arrangement for urging the change-over valve to the first set position; a plunger having a first set position and a second set position and functioning to bring the change-over valve into the second set position when the plunger is urged to the second set position. The inhibitor have functions to perform the supply and discharge of the hydraulic pressure to and from the hydraulic servomechanism in accordance with a first hydraulic signal and a second hydraulic signal through an arrangement which produces the first hydraulic signal for urging the change-over valve to the second set position and urging the plunger to the first set position.

Abstract: A support mechanism for friction coupling devices in an automatic transmission is disclosed.A snap ring is mounted on a stationary or rotational member in an automatic transmission case and adapted to receive the operational load of one friction coupling device through an annular plate member.A stepped portion is formed on the stationary or rotational member and adapted to receive the operational load of another friction coupling device through the annular plate member.

Abstract: A hydraulic control system for an automatic transmission, including a pressure source, a regulator valve for regulating the oil pressure from the source, a first hydraulic servo for setting the transmission in a high speed position upon receipt of output oil pressure of the pressure regulator valve, and a second hydraulic servo for setting the transmission in a low speed position upon receipt of the output oil pressure, wherein the hydraulic control system comprises:a shift timing mechanism including a shift timing valve provided in a drain conduit of the second hydraulic servo and adapted to accelerate drainage of the second hydraulic servo in response to increases in supply oil pressure to the first hydraulic servo.

Abstract: A parking mechanism for a transmission, comprising: a coupling member engageable simultaneously with two gears for different gear positions of the transmission when a change device provided besides a driver's seat is set in a "parking" position.

Abstract: A lubricating system for a transmission of the kind having a driving shaft driven to rotate, a transmission shaft disposed parallel to the driving shaft, a chain for transmitting power from the driving shaft to the transmission shaft and a chain case enclosing the chain, the lubricating system comprising a chain chamber and an oil reservoir chamber in the chain case, the oil reservoir chamber having an upper inlet port for receiving oil from the chain chamber, at least some of the oil in the chain chamber being driven to reach the inlet port by movement of the chain, and the oil reservoir chamber having a lower outlet port for returning oil to the chain chamber, whereby oil flowing through the oil reservoir chamber may be cooled and the amount of oil in the chain chamber subject to agitation by the chain movement at any one time may be reduced, substantially prolonging the operational life of the lubricating oil.

Abstract: A hydraulic controller for transmission includes a brake and a clutch each of which corresponds to a different transmission ratio. An orifice control is provided in the conduit structure of the hydraulic circuit for actuating the clutch and brake such that a working oil quantity is varied in response to the engine throttle valve opening.

Abstract: A support for an automatic transmission. The support has a tubular supporting portion having an inner peripheral surface supporting a transmission shaft and an outer peripheral surface supporting an inner cylindrical portion of a hydraulic servo drum of the transmission. The support has working oil passages formed therein and adapted for supplying and discharging a working oil to and from the hydraulic servo drum. The support has a support body including a first oil passage leading from an oil pressure controller for supplying and discharging working oil and communicating with the inner periphery of the tubular supporting portion, a second oil passage providing a communication between the outer periphery and the inner periphery of the tubular supporting portion and an inner oil groove providing a communication between inner peripheral openings of the first and second oil passages.

Abstract: Described herein is a hydraulic servo suitable for friction coupling elements in automatic transmissions. The hydraulic servo of the invention is compact in construction and easy to assemble, including an annular drum rotatably or fixedly mounted in an automatic transmission case, a piston provided in a predetermined position of the drum, a return spring provided on the piston, and a connecting member for connecting the return spring and the piston, characterized in that the piston is provided with a guide sleeve at the tip end of one end face thereof for guiding one end of said connecting member.

Abstract: A governor valve for a hydraulic controller in an automatic transmission, which is disclosed herein, comprises an adapter having a line pressure supply bore made therethrough, a cylindrical governor rotary shaft loosely fitted into the adapter sleeve and having a line pressure supply port made therein, the port including notches intersecting the axis at right angles, a centrifugal weight mounted on one end of the governor rotary shaft and having a return spring, and a spool adapted to slide within the governor rotary shaft with the weight being urged against one end thereof. In this governor valve, there are provided dirt and dust collecting means for preventing dirt and dust separated by a centrifugal action from collecting in the line pressure supply port during the stoppage of the governor rotary shaft so as to make the shaft stick.

Abstract: Described herein is a hydraulic servo suitable for friction coupling elements in automatic transmissions. The hydraulic servo of the invention is compact in construction and reduced particularly in axial dimensions, and essentially comprises: an annular drum rotatably or fixedly mounted in a transmission case and having a press-formed annular plate member with an first cylinder portion and a second cylinder member joined to the first cylinder portion by fully encircling welding; a piston fitted between the first cylinder portion and the second cylinder member; and a reaction area formed by extending the annular plate member of the drum radially inward to support return springs.

Abstract: A transmission control system for an automatic transmission for a vehicle having a main transmission unit which provides a plurality of speed stages and an auxiliary transmission unit which is connected in series with the main transmission unit and provides two very different speed reduction ratios such as 1 and 3 such as desirable for a transmission selectively operative in a two wheel drive operational mode or in a four wheel drive operational mode, the auxiliary transmission being manually switched over between the two different speed reduction ratios, wherein there is provided a means for controlling the auxiliary transmission unit to override the manual control of the auxiliary transmission in a manner only to prevent switching over of the auxiliary transmission unit to the larger speed reduction ratio according to at least one parameter with regard to operational conditions of the vehicle and also according to which of the plurality of speed stages the main transmission unit is set.

Abstract: A control system for a 4-wheel drive transmission including a main transmission and an auxiliary transmission shiftable by operation of a hydraulic clutch for switching the mode of operation either to 2-wheel drive or 4-wheel drive including a manual changeover valve mechanically connected to a shift lever in a passenger's room of a vehicle for operating the hydraulic clutch according to the mode selected by the shift lever.

Abstract: A power delivery system, which includes an input shaft, an output shaft disposed concentrically with the input shaft, a fluid coupling and a power cut-off device interposed between the input and output shafts, and a case containing the fluid coupling, characterized in that the power cut-off device is located on a radially inner side of the fluid coupling, and an oil pump for supplying oil into the fluid coupling case is positioned within the case adjacent the radially inward periphery of the power cut-off device.

Abstract: A control system for a four-wheel drive transmission comprising a primary transmission and a transfer unit capable of establishing a high-speed four-wheel drive mode, a low-speed four-wheel drive mode and a two-wheel drive mode by the agency of friction coupling devices which are controlled selectively for engagement and disengagement by the corresponding hydraulic servomechanisms.

Abstract: A coupling mechanism including a fluid coupling device having input and output elements, and a centrifugal type lock-up clutch for releasably engaging the input and output elements, characterized in that the lock-up clutch comprises: a cylindrical inner surface formed on the input element; a drive plate provided with friction elements displaceable in a radially outward direction for engagement with the cylindrical inner surface, and cam weights for urging the friction elements in a radially outward direction; a driven plate coupled with the output element; a damper of a resilient material provided between the drive and driven plates; and a cam surface for urging the cam weights in a radially outward direction according to the degree of relative displacement between the drive and driven plates.

Abstract: A centrifugal type friction clutch, comprising: a first rotary coupling member provided with a plural number of friction element support means on the outer peripheral portions thereof; a second rotary coupling member having a cylindrical inner peripheral surface disposed coaxially with the outer periphery of the first rotary coupling member and provided with a frictional engaging surface thereon; and friction coupling elements respectively supported by the friction element support means and displaceable radially outward according to the rotational speed of the first rotary coupling member for engagement with the frictional engaging surface of the second rotary coupling member; each one of the friction coupling elements comprising an arcuate friction shoe with a frictional engaging surface on the outer periphery thereof, a resilient retractor means located between the friction shoe and friction element support means, and a cam means pivotally supported on the first rotary coupling member for pressing the frict

Abstract: An endless driving belt of the kind adapted for entrainment between at least two pulleys in a V-belt continuously variable transmission, has a plurality of links; means for connecting each link to a next link to enable articulated movement of the links; a plurality of primary blocks engaging the links and positioned one each between adjacent pins; a plurality of secondary blocks disposed one each between adjacent primary blocks and radially supported by one of the pins to provide a clearance preventing engagement with the links, the primary and secondary blocks being engageable with one another; and, the secondary blocks having side surfaces for engaging the entrained pulleys and the primary blocks having side surfaces adapted to avoid engagement with the entrained pulleys, radially and outwardly directed driving forces being transmitted from a driving pulley to the secondary blocks and from the secondary blocks to the pins, the links being driven only by nonradially directed forces, whereby the radially and

Abstract: An endless transmission belt adapted for extension between a pair of pulleys for a V-belt type continuously variable transmission, the belt comprising: a plurality of linking units, each link unit comprising a plurality of link elements having opposite end portions thereof over lapped alternately with link elements of adjacent link units; joint members pivotally connecting the overlapped end portions of adjacent links; paired first and second blocks disposed over each of the link units between adjacent joint members, each block having side surfaces engageable with the pulleys; each of the first blocks having an outer lapping face in abutting engagement with an adjacent second block and having an inter lapping face with a connecting portion in engagement with one of the joint members, each of the joint members pivotally supporting one of the first blocks in a radial position providing a clearance between each first block and each link unit; and, each of the second blocks having an outer lapping face in abuttin

Abstract: An internal-gear pump with a partition plate, comprising: an arcuate chamfer formed at an inner edge of an end face of the partition plate rotationally opposing an inner gear of the pump and having a curvature at least greater than that of tooth tip edges of the inner gear.