摘要:
In an automatic transmission, a planetary gear set 30 is disposed adjacently to an end cover 6b and configured such that its inner peripheral face of a carrier 33 is rotatably supported on an outer peripheral face of a boss portion 6b1 provided at the end cover 6b. A lubricating-oil supply passage comprises an oil passage \ 6br formed from the end cover 6b to the boss portion 6b1, an oil passage 33r formed in the carrier 33 so as to tightly connect to the oil passage 6br at the inner face of the carrier, and an oil passage 35r formed in the pinion shaft 35 so as to tightly connect to the oil passage 33r and reach an outer peripheral face of the pinion shaft. There is provided a lubricating oil supply means V for supplying lubricating oil to the bearing portion 101 via the above-descried lubricating-oil supply passage.
摘要:
By a suitable combination of switching valves (1003-1007), the number of pressure control valves (1021-1023) for the actuation of the frictional torque transfer devices (26,51-55) in an automatic transmission can be reduced.
摘要:
A control system for an automatic transmission of the type having a plurality of friction coupling elements which are selectively locked and unlocked with hydraulic oil to change power transmission paths to place the automatic transmission into desired available gears, a first specific friction coupling element having a locking pressure chamber and an unlocking pressure chamber and being locked when operating oil is charged into only said locking pressure chamber and unlocked when operating oil is coincidentally charged into the locking pressure chamber and said unlocking pressure chamber, and a second specific friction coupling element having a locking/unlocking pressure chamber in communication with the unlocking pressure chamber of the first specific friction coupling element and being locked only when operating oil is supplied into the locking/unlocking pressure chamber. a pressure level Transitional pressure of operating oil is controlled and duration time during a specific gear shift where these specific friction coupling elements are coincidentally locked and unlocked.
摘要:
A control system for an automatic transmission having friction coupling elements, at least one of which is locked in 3rd and 4th gears and unlocked in 1st and 2nd gears, includes a first shift valve shiftable between 3rd and 4th gears, and second shift valve shiftable between in 2nd gear and 1st gear in which engine brake available, and a solenoid valve providing control pressure which is selectively directed to these shift valves and cause them to shift so as to lock or unlock the friction coupling elements.
摘要:
In an automatic transmission, a planetary gear set 30 is disposed adjacently to an end cover 6b and configured such that its inner peripheral face of a carrier 33 is rotatably supported on an outer peripheral face of a boss portion 6b1 provided at the end cover 6b. A lubricating-oil supply passage comprises an oil passage \ 6br formed from the end cover 6b to the boss portion 6b1, an oil passage 33r formed in the carrier 33 so as to tightly connect to the oil passage 6br at the inner face of the carrier, and an oil passage 35r formed in the pinion shaft 35 so as to tightly connect to the oil passage 33r and reach an outer peripheral face of the pinion shaft. There is provided a lubricating oil supply means V for supplying lubricating oil to the bearing portion 101 via the above-descried lubricating-oil supply passage.
摘要:
On an input shaft 1 are provided in order from a side of an engine E a torque converter 4 with a lock-up clutch, a first planetary gear set G1 as a multiplying mechanism, a counter drive gear 5 outputting a rotational drive force to a countershaft 2 , a second planetary gear set G2 as a speed-change element, a third planetary gear set G3 as a speed-change element. Accordingly, there can be provided an automatic transmission for six forward speeds with plural planetary gear sets, clutches and brakes that can properly reduce a clutch capacity and restrain gear noises with its compact and light-weighted structure.
摘要:
There are provided a first planetary gear set ( 7 ) including a first sun gear ( S1 ), a first carrier ( CA1 ), and a first ring gear ( R1 ); a second planetary gear set ( 8 ) including a second sun gear ( S2 ), a second carrier ( CA2 ), and a second ring gear ( R2 ); and a third planetary gear set ( 9 ) including a third sun gear ( S3 ), a third carrier ( CA3 ), and a third ring gear ( R3 ). A first forward speed ratio is established with the engagement of a third brake ( B3 ) and a first clutch ( CL1 ) ; a second forward speed ratio is established with the engagement of a first brake ( B1 ) and the first clutch ( CL1 ); a third forward speed ratio is established with the engagement of a second brake ( B2 ) and the first clutch ( CL1 ); a fourth forward speed ratio is established with the engagement of the first clutch ( CL1 ) and a second clutch ( CL2 ); a fifth forward speed ratio is established with the engagement of the second brake ( B2 ) and the second clutch ( CL2 ); and a sixth forward speed ratio is established with the engagement of the first brake ( B1 ) and the second clutch ( CL2 ). This attains an automatic transmission providing six forward speed ratios which has high transmission efficiency, is compact, and has a suitable gearing pattern.
摘要:
A hydraulic control system for an automatic transmission having at least a forward clutch which is unlocked in a fourth gear and locked in other forward gears and a lock-up clutch for coupling input and output elements of a torque converter together is equipped with a pressure control valve for controlling operating pressure for the forward clutch, a lock-up control valve for connecting and disconnecting the first valve from the lock-up clutch, a pressure line through which control source pressure is introduced into the forward clutch while the first valve is in communication with the lock-up clutch, and a shift valve for discharging the control source pressure from the pressure line.
摘要:
A control system for an automatic transmission having at least a friction coupling element which is coupled with a hydraulic pressure increasing by way of a leveled transitional pressure has an accumulator which discharge a high level of pressure accumulated therein into the friction coupling element during a gear shift under the condition where the line pressure is low.