Operation
OPERATION
What's on when
- A = Applied
- H = Holding
- * = Limp-in Mode
- ^ = Applied in coast only
In total, the 62TE provides seven forward ratios and one reverse.
The underdrive compounder assembly has two modes of operation: direct and reduction.
Notice in the "What's On When" chart, the 2-3, 3-2, and 4-2 shifts require a "double swap" shift. This occurs when two elements are turned off while two different elements are engaged.
This clutch-to-clutch synchronization takes place within 40 - 70 milliseconds, producing a smooth shift. If the underdrive compounder assembly shifts too early (in relation to the shifts taking place in the main centerline), a shudder or harsh shift results. If the underdrive assembly shifts too late, the driver experiences a "double bump" sensation.
To avoid a double swap shift in a 6-4 downshift, the transaxle shifts into 4th prime, which requires the deactivation of the OD clutch and the simultaneous application of the UD clutch.
REVERSE GEAR
In Reverse, the Reverse Clutch (R) (1) is applied to provide input torque. The reverse clutch drives the front sun gear. The L/R clutch (2) is applied to hold the front carrier/ rear annulus assembly. The rear carrier/front annulus assembly rotates as an output member in reverse with a reduction gear ratio of 2.21:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears and the underdrive shaft. The Low Clutch (LC) (3) is applied to hold the underdrive compounder sun gear. With the sun gear held, the annulus drives the underdrive compounder carrier, and a reduction gear ratio of 1.45:1 is achieved
The main centerline ratio of 2.21:1 is multiplied by the underdrive compounder centerline ratio of 1.45:1. As a result, the ratio through the entire gear train to the final drive in Reverse is 3.215:1.
FIRST GEAR
In First gear, the UD clutch (1) is applied to provide input torque. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The L/R clutch (2) is applied to hold the front carrier/rear annulus assembly. By doing so, the rear planet gears are forced to rotate around the inside of the stationary rear annulus. The rear carrier/front annulus assembly rotates as an output member with a reduction gear ratio of 2.84:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears and the underdrive shaft. The Overrunning Clutch (ORC) holds the underdrive sun gear. The LC (3) is also applied during coast in first gear. With the sun gear held, the annulus drives the underdrive compounder carrier, and a reduction gear ratio of 1.45:1 is achieved by the underdrive compounder gear set.
The main centerline ratio of 2.84:1 is multiplied by the underdrive compounder centerline ratio of 1.45:1. As a result, the ratio through the entire gear train to the final drive in First gear is 4.127:1.
SECOND GEAR
In Second gear, the UD clutch (1) is applied to provide input torque. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The L/R clutch (2) is applied to hold the front carrier/rear annulus assembly. By doing so, the rear planet gears are forced to rotate around the inside of the stationary rear annulus. The rear carrier/front annulus assembly rotates as an output member with a reduction gear ratio of 2.84:1.
Power from the main centerline transfers to the underdrive compounder gear set annulus by way of the transfer gears and the underdrive shaft. The direct clutch (3) is applied to drive the underdrive compounder sun gear at the same speed as the underdrive annulus. With two members driven, the underdrive compounder gear set operates in direct, or 1:1.
The main centerline ratio of 2.84:1 is multiplied by the underdrive compounder centerline ratio of 1:1. As a result, the ratio through the entire gear train to the final drive in Second gear is 2.84:1.
THIRD GEAR
In Third gear, the UD clutch (1) is applied to drive the rear sun gear. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The 2/4 clutch (2) is applied to hold the front sun gear. The rear carrier/front annulus rotates as an output member with a reduction gear ratio of 1.573:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears and the underdrive shaft. The Overrunning Clutch (ORC) holds (4) the underdrive sun gear. The LC (3) is also applied during coast in first gear. With the sun gear held, the annulus drives the underdrive compounder carrier, and a reduction gear ratio of 1.45:1 is achieved by the underdrive compounder gear set.
The main centerline ratio of 1.57:1 is multiplied by the underdrive compounder centerline ratio of 1.45:1. As a result, the ratio through the entire gear train to the final drive in Third gear is 2.28:1.
Third gear is also the default (limp-in) gear position.
FOURTH GEAR PRIME
In Fourth Prime, the UD clutch (1) is applied to drive the rear sun gear. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The 2/4 clutch (2) is applied to hold the front sun gear. The rear carrier/front annulus rotates as an output member with a reduction gear ratio of 1.57:1.
Power from the main centerline transfers to the underdrive compounder gear set annulus by way of the transfer gears and the underdrive shaft. The direct clutch (3) is applied to drive the underdrive compounder sun gear at the same speed as the underdrive annulus. With two members driven, the underdrive compounder gear set operates in direct, or 1:1.
The main centerline ratio of 1.57:1 is multiplied by the underdrive compounder centerline ratio of 1:1. As a result, the ratio through the entire gear train to the final drive in Fourth Prime is 1.573:1.
FOURTH GEAR
In Fourth gear, the UD (1) and OD clutches (2) are applied to provide input torque. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The OD hub assembly is splined to the front carrier/rear annulus assembly. When the OD clutch is applied, the OD hub and front carrier/ rear annulus assembly are also driven. With the rear sun gear and the rear annulus driven at the same speed and in the same direction, the entire front/rear planetary gear train is locked and rotating as one unit. The rear carrier/front annulus rotates as an output member in direct, or 1:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears and the underdrive shaft. The Overrunning Clutch (ORC) (4) holds the underdrive sun gear. The LC (3) is also applied during coast in first gear. With the sun gear held, the annulus drives the underdrive compounder carrier, and a reduction gear ratio of 1.45:1 is achieved by the underdrive compounder gear set.
The main centerline ratio of 1:1 is multiplied by the underdrive compounder centerline ratio of 1:45. As a result, the ratio through the entire gear train to the final drive in Fourth gear is 1.45:1.
FIFTH GEAR
In Fifth gear, the UD (1) and OD clutches (2) are applied to provide input torque. The UD hub is splined to the rear sun gear. When the UD clutch is applied, the UD hub and rear sun gear are driven. The OD hub assembly is splined to the front carrier/rear annulus assembly. When the OD clutch is applied, the OD hub and front carrier/ rear annulus assembly are also driven. With the rear sun gear and the rear annulus driven at the same speed and in the same direction, the entire planetary gear set is locked and rotating as one unit. The rear carrier/front annulus assembly rotates as an output member in direct drive, or 1:1.
Power from the main centerline transfers to the underdrive compounder gear set annulus by way of the transfer gears and the underdrive shaft. The direct clutch (3) is applied to drive the underdrive compounder sun gear at the same speed as the underdrive annulus. With two members driven, the underdrive compounder gear set operates in direct, or 1:1.
The main centerline ratio of 1:1 is multiplied by the underdrive compounder centerline ratio of 1:1. As a result, the ratio through the entire gear train to the final drive in Fifth gear is 1.00:1.
SIXTH GEAR
In Sixth gear, the OD clutch (1) is applied to drive the front carrier/rear annulus assembly. The OD hub is splined to the front carrier/rear annulus assembly. When the OD clutch is applied, the OD hub and front carrier/rear annulus assembly are driven. The 2/4 clutch (2) is applied to hold the front sun gear. Overdrive can be achieved using the front gear set. The rear carrier/front ring gear/ annulus rotates as an output member with an overdrive gear ratio of 0.69:1.
Power from the main centerline transfers to the underdrive compounder annulus by way of the transfer gears and the underdrive shaft. The direct clutch (3) is applied to drive the underdrive compounder sun gear at the same speed as the underdrive annulus. With two members driven, the underdrive compounder carrier rotates with a direct drive.
The main centerline ratio of 0.69:1 is multiplied by the underdrive compounder centerline ratio of 1:1. As a result, the ratio through the entire gear train to the final drive in Sixth gear is 0.69:1.