摘要:
A torque converter includes a coaxially mounted pump impeller, turbine, and stator, each of which includes an outer shell, an inner shell, and vanes extending between the outer shell and the inner shell having edges which define an inlet and outlet. The pump impeller outlet is proximate to the turbine inlet, the turbine outlet is proximate to the stator inlet, and the stator outlet is proximate to the pump impeller inlet. The outer and inner shells cooperate to define outer and inner toroidal surfaces, which together define a hollow toroidal hydraulic fluid circulation path. The ratio between the axial extent and the radical extent of a section of the outer toroidal surface is less than approximately 0.9. The axial distance between the general axial position of the edges of the stator vanes which define the stator inlet and the axial position of the edge of the stator inner shell in the direction of the stator inlet is substantially greater than zero, and the stator vanes which define the stator inlet extend more towards the direction of the turbine outlet than does the edge of the stator inner shell in the direction of the stator inlet.
摘要:
In a hydraulic torque converter having a torus of flatness ratio (L/H) within the range 0.82-0.9, the outer and inner contours of the turbine in a meridional plane through the axis of the turbine each comprises a combination of a plurality of circular arcs, wherein the ratios between the radii of the circular arcs constituting said outer contour is substantially less than 2, and the ratios between the radii of the circular arcs constituting said inner contour is substantially less than 2.As a result, fluid flows through the turbine stably without being biased, increasing the velocity of relative flow along the turbine blade, and raising the normal speed ratio at which the absolute flow is in the direction of no impact, enabling a higher stall torque ratio without reduction in efficiency.
摘要:
An automatic transmission includes a transaxle casing and an overdrive casing fixed to the transaxle casing. A gear transmission mechanism is housed within the transaxle casing, and an overdrive mechanism is housed within the overdrive casing. Each of these is hydraulically controlled. A first hydraulic fluid accumulator for moderating sudden pressure changes within a part of a control mechanism for the gear transmission mechanism is housed within the transaxle casing, and a second hydraulic fluid accumulator for moderating sudden pressure changes within a part of a control mechanism for the overdrive mechanism is housed within the overdrive casing. Thereby a common type of transaxle casing may be used both for an automatic transmission assembly which incorporates such an overdrive mechanism and for an automatic transmission assembly which does not incorporate such an overdrive mechanism, and in the latter case no waste of space within the transaxle casing due to the unnecessary provision of space for the second hydraulic fluid accumulator need occur.
摘要:
A control system for an intermediate differential in a four-wheel drive vehicle, the intermediate differential being provided with a lock mechanism which is operated under control of an actuator to selectively maintain the intermediate differential in a locked condition or an unlocked condition. The control system includes a first sensor arranged to detect a steering angle of a dirigible road wheel for producing a first detection signal therefrom when the steering angle exceeds a predetermined value, a second sensor arranged to detect disconnection of the drive power transmitted to the intermediate differential from a prime mover of the vehicle for producing a second detection signal therefrom when transmission of the drive power is disconnected, and a control device responsive to the first and second detection signals from the sensors for controlling the actuator in such a manner that the lock mechanism is operated to release the locked condition of the intermediate differential when the steering angle exceeds the predetermined value in a condition where the transmission of the drive power is disconnected.
摘要:
A vehicle transmission including a first, a second and a third planetary gear unit coaxially disposed between an input and an output member. The three units have respective first, second and third sun gears, respective first, second and third planetary gears, respective first, second and third carriers, and respective first, second and third ring gears. The first carrier, second ring gear, third sun gear and output members are connected to each other, while the second carrier and the third ring gear are connected to each other. The transmission has a first and a second coupling device for connecting the first ring and sun gears to the input member, respectively, a third and a fourth coupling device for connecting the first sun gear to the second sun gear and to the second carrier and third ring gear, respectively, a fifth coupling device for fixing the third carrier to a stationary member, a sixth coupling device, for fixing the second carrier and third ring gear to the stationary member, and a seventh coupling device for fixing the second sun gear to the stationary member.
摘要:
A shift control apparatus for an automatic transmission including a gear train having a plurality of one-way clutches having their engagement states switched in accordance with torque applying directions and a plurality of frictional engagement units adapted to be engaged by oil pressures. The apparatus comprises a controller for engaging a first one of the frictional engagement units so as to maintain a predetermined gear stage after any of the one-way clutches has been engaged or released, if a predetermined condition is satisfied after the one-way clutch has been engaged or released to start a shift to the predetermined gear stage.
摘要:
In an automatic transmission to provide a plurality of forward speed stages for a vehicle having a transversely mounted engine, a counter drive gear serving as a power output member of the speed change gear device to drive a counter shaft is positioned between a planetary gear mechanism of the speed change gear device and the torque converter, and the forward clutch which is engaged to provide a plurality of forward speed stages is positioned between the torque converter and the counter drive gear.
摘要:
A planetary gear type speed change device having a first planetary gear mechanism 10, 12, 14, 16 or 60, 64, 66, 68, 70 and a second planetary gear mechanism 20, 22, 24, 26 or 62, 64, 66, 70 incorporated between an input shaft 52 and an output shaft 54 by a selectively actuable drive system including four clutches 38, 40, 42, 44, two brakes 46, 48 and a one-way clutch 34, wherein the one-way clutch 34 has two functions of selectively braking the ring gear 12 or the carrier 70 with respect to the housing 50 via the brake 46 in providing a first speed stage and also of selectively connecting the carrier 26 or 70 with the sun gear 20 or 62 via the clutch 40 in providing a third speed stage.
摘要:
In an automatic transmission, a small-capacity second clutch that does not engage for reverse drive is mounted forward of a counter drive gear, and the other engaging elements of relatively larger capacity, that is, first and third clutches and first to third brakes, are disposed rearward of the counter drive gear, so that an axially extending space is formed between the counter drive gear and the second clutch, which space is utilized to accommodate a parking gear. Such an arrangement of engaging elements allows the counter shaft to be placed closer to the input shaft without the parking gear interfering with the second clutch, thereby enabling a more compact automatic transmission. Furthermore, since there is no need to relocate the counter drive gear rearward, the length of the counter shaft can be reduced, thereby enabling still greater compactness.
摘要:
In an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second input clutches C1, C2 and adapted to selectively engage the first and second input clutches in three ways of engaging the first input clutch C1 with the second input clutch C2 being disengaged to provide a certain first speed stage (2nd speed stage), engaging the second input clutch C2 with the first clutch C1 being disengaged to provide a certain second speed stage (4th speed stage) and engaging both the first and second clutches C1, C2 to provide a certain third speed stage (3rd speed stage), a hydraulic control device has a first valve (3-4 shift valve) for switching over connection of the first input clutch C1 with a hydraulic pressure supply 274 and a drain 280, a second valve (2-3 shift valve) for exchanging connection of the second input clutch C2 and a fail safe port 260 with a hydraulic pressure supply 246 and a drain 252, 253, and a passage 268 for connecting the drain for the first valve with the fail safe port 260 of the second valve so that at least one of the first and second input clutch is supplied with hydraulic pressure regardless of sticking of the first and/or the second valve.