Voith DIWA
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The Voith DIWA automotive transmission was designed by Voith primarily for city-buses and suburban buses. The transmission utilizes a Differential-Wandler (Converter) or DIWA which replaces two gears which would be used on a conventional transmission. Voith has designed many variations and generations of the Voith DIWA.
History Evaluation
DIWA (D851/D854/D854G)
- Three/four front speed, four-speed G version (for example, Metroliner D854G), add a set of 1.36:1 reduction gear to the output
- Three-stage throttle sensor (there are two switches on the inside), the throttle depth corresponding to each stage needs to be manually adjusted
- The shifting speed is divided into four stages with the same force (three-stage throttle + kickdown)
- The hydraulic retarder will go out when the vehicle speed is too low, and it will turn a gear at the same time.
- All oil valves are on-off, and the force of biting the clutch is controlled by adjusting the working/o of a gearbox.
DIWA 2 (D851.2/D854.2/D854.2G/D863/D864)
- T0, T1 two types of turbines, R0, R1 two types of rear gear planetary gears
- Automatic neutral selection when parking
- Individual oil valves can be operated between torque converter pressure and operating pressure, whichever is higher
DIWA 3 (D823.3/D851.3/D854.3/D863.3/D864.3/D883.3/D884.3)
- No G version
- Reworked gearbox computer
- Uninterrupted throttle sensor (at least seven-stage throttle + kickdown) / signal by trip computer
- Newly added input speed sensor and back gear planetary gear ring speed sensor, the former is used to check the difference between input and output speed when rotating the gear, and the latter is used to check the back gear planetary gear when the retarder is locked for more precise control.
- The hydraulic retarder will go out when the vehicle speed is too low. After turning back for a gear, gently bite the back gear and slow down.
- The oil circuit is controlled, especially the oil pressure of the torque converter is controlled.
- Most oil valves can independently sense and control the output oil pressure (any 0-100% of the operating pressure), and control the clutch force more accurately and timely. The operating pressure is always kept at 100%, so there is no need for accumul.
DIWA.3E (D823.3E/D851.3E/D854.3E/D863.3E/D864.3E/D883.3E/D884.3E/D381.4)
- Additional SensoTop
- D381.4 is D851.3E with a different planetary gear and input flange configuration
DIWA.5 (D824.5/D854.5/D864.5/D884.5)
- Full-line of four-speed version
- Six types of pump wheels: L, F, G, V, X, H
DIWA.6 (D824.6/D854.6/D864.6/D884.6)
- Stop-Start System added
- The operating pressure will be adjusted according to the situation. It is necessary to increase it first, which can reduce unnecessary load of the oil pump and save fuel.
DIWA.8 (D827.8/D857.8/D867.8/D887.8)
- Seven configurations instead of four, and six gear ratios instead of three
- Four planetary gearsets and a mild hybrid generator/motor
Gear ratios
D200, D506 (wide-ratio)
| 1 | 2 | R |
|---|---|---|
| 1.97 | 0.95 | 3.80 |
D501, D506 (close-ratio)
| 1 | 2 | R |
|---|---|---|
| 1.39 | 0.85 | 3.80 |
D854 (D851 is 3 forward+reverse with the same ratios), DIWA.4
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 5.200 | 1.360 | 1.000 | 0.735 | 3.800 |
DIWA.5, DIWA.6
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 5.200 | 1.429 | 1.000 | 0.700 | 4.120 |
See also
References
"Voith 506 Document" (PDF). Voith. Voith. Retrieved 24 October 2013.
"DIWA.3E, E 200, DIWAGNOSIS - The Combination for Economic Operation". Voith. Voith. Retrieved 24 October 2013.