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| Illustration 1 | g00640498 |
Sectional view of a speed clutch ("2" and "A") (1) Front tapered roller bearing (2) Bearing set for the end gear (3) End gear for the speed clutch (4) Retainer plate for clutch (5) Clutch piston and seals (6) Center gear and shaft assembly (7) Friction and separator plates (8) Carrier bearings for the end gear (tapered set in A speed clutch) (9) End gear for the speed clutch (10) Rear tapered roller bearing (11) Oil supply sleeve for the center housing (12) Sealing rings (13) Snap ring and retainer (14) Belleville washers (6) (15) Lube block washer (16) Clutch oil passage (17) Clutch oil passage (18) Oil passage for lube (19) Snap ring for the end gear | |
Illustration 1 is typical of all six speed clutches. Two speed clutches share a common shaft (6). The only differences in the three pairs of speed clutches are the following items: center shaft of one set, number of gear teeth and hub surface of the end gears.
The main shaft has a central gear that is welded to the shaft. The weldment also provides the housings for the two multi-plate clutches. The main shaft at each end has two gears that move freely. The gears are supported by two tapered roller bearings (2), or ball bearings (8). The complete assembly is carried by tapered roller bearings (1) and (10) that are located at each end.
All of the six speed clutches are identical. There are nine internally splined friction plates (7). These plates are carried on the hub of the end gear. Nine polished steel plates are externally splined and carried by the central housing. The clutches are hydraulically applied and released by a spring. The medium for the spring is provided by six belleville washers (14) in each clutch. Since the clutches are hydraulically applied there is automatic compensation for normal wear which eliminates any need for adjustment.
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| Illustration 2 | g00444684 |
When clutch (20) is applied the respective end gear (3) is locked to shaft (6) and power can be transferred from the end gear to the center gear, or from the center gear to the end gear. When the two clutches are actuated, the power can be transferred from end gear to end gear. | |
Each pair of speed clutches receives three separate oil supplies. A pair of speed clutches receives an oil supply for each of the two clutch actuation circuits (21). Also, one common supply (18) is for lubrication and cooling of the following parts: two clutch assemblies, the bearings of the two main gears (22) and the support bearings for the shaft (1).
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| Illustration 3 | g00536971 |
The three oil supplies are controlled by transmission hydraulic control (24) that is electronically managed. The transmission hydraulic control is mounted externally on the right hand side of center housing (23) of the three-piece transmission case. Internally drilled holes (25) in the center housing route the oil supplies to the ends of the three pairs of speed clutches.
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| Illustration 4 | g00444686 |
Bronze impregnated sealing rings (12) are positioned in annular grooves on the shaft ends. Oil for clutch actuation is fed between the sealed grooves from the drilled holes (21) in the center section. The center section carries serviceable sleeves (11) in case wear should occur in the area of the oil transfer. The third oil supply for lubrication and cooling enters the end of the shaft from a similar drilled hole (18) in the center section.
Oil is transferred along the center of the shaft through axial drilled passages and the oil intersects with the cross-drilled passages of the piston chambers.
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| Illustration 5 | g00445146 |
The oil that is entering piston chamber (17) acts on the surface area of piston (27) which is sealed to central housing (6). Also, the surface area is sealed to the shaft by sealing rings (28). The oil moves the piston against lube block washer (15) and six belleville washers (14). Polished steel plates (26) that are externally splined to the central housing are then compressed against the composite friction plates (29) which are internally splined to end gear (3). Power can then be transmitted from central gear (6) to end gear (3). Also, power can be transmitted from end gear (3) to central gear (6). This depends on the selected speed.
Note: When some speeds are selected both clutches within a clutch assembly may be engaged. This will transfer the power from one end gear to the other end gear.
When the electronically controlled transmission hydraulic control signals the release of the clutch, belleville springs (14) return piston (27) to the original position. The exhausted oil is returned to the transmission hydraulic control and the friction that is between the two sets of plates (26) and (29) is released.
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| Illustration 6 | g00445206 |
The rate and the amount of pressure that is supplied to the clutch and released from the clutch is controlled by the Electronic Transmission Control. The system provides a clutch engagement that is consistent and progressive in a timely manner. Lubrication and cooling oil that is entering the shaft at end face (18) is allowed to exit the shaft at various laterally drilled passages (30) that are positioned in order to ensure that all components are thoroughly lubricated and cooled.
Lube block washer (15) restricts the lube oil flow to the clutches that are not applied. This allows a reduction in drag and an increase in efficiency. Piston (5) moves in order to engage the clutch and the lube block washer uncovers lubrication inlet port (30). This maximizes the oil flow for cooling the clutch.