Overview: a hybrid mechanical/hydraulic transmission dedicated to vehicles driving at normal highway speeds while working at slow speeds between 0 and 10 km/h. In transport mode, the mechanical transmission operates as usual. In “creep mode,” the mechanical transmission is de-clutched and the hydraulic transmission is engaged, providing smooth and perfectly controllable ground speeds. Without having to repeatedly modulate the clutch, gear selection and brakes to optimize ground speed, there is less wear on the mechanical drive-train parts, fuel savings, and reduced emissions.
- The Market
- The Poclain Hydraulics Technical Solution
- Comparison with a Traditional Mechanical Transmission
AddiDrive™ CreepDrive is designed for vehicles that work at very low speeds but travel at normal speeds on-road. The annual accumulated quantities of these vehicles are significant and their environmental impact is real, even if it receives little media coverage.
| Vehicle Type||Estimated Quantity in 2006|
|Road striper vehicle (road marking)||1,500|
|Sprayer – grit spreader||4,000|
|Street sprayer / cleaner||2,000|
|Railroad combination vehicle||3,000|
|Airplane de-icing vehicle||1,300|
|Asphalt laying machine||3,000|
|Works inspection vehicle||600|
|Asphalt repair vehicle||1,200|
The Poclain Hydraulics Technical Solution: AddiDrive™ CreepDrive
The proposed system: a single component enables you to shift from a mechanical to a hydraulic transmission.
|1 – Engine|
2 – PTO Gearbox
3 – Variable Displacement Pump
4 – CreepDrive Motor
The heart of the AddiDrive™ CreepDrive: CM170-050 Hydraulic Motor
The CDM 170-050 integrates a cam-lobe radial-piston hydraulic motor that is activated by a pneumatic clutch.
Used at speeds lower than 10 km/h it delivers 40 kW at maximum power, with a displacement of up to 1000 cc. Being compact and light-weight (124 kg), it can easily be inserted onto transmission shafts.
Comparison with a Traditional Mechanical Transmission:
|AddiDrive™ CreepDrive||Traditional Mechanical Transmissions|
|No stress on the transmission clutch or service brakes||Large amount of stress on the clutch and brakes at low speeds therefore the emission of particulate matter from the brakes|
|Independence between the speed of the combustion engine and that of the vehicle speed lead to a reduction in fuel consumption||High engine speed at low road speeds lead to a high fuel consumption|
|Noise reduction thanks to constant engine RPM’s||Noise pollution due to the increases and decreases in engine RPM’s|
|Allows the combustion engine’s performances to be optimised at high speeds, thus reducing losses and limiting consumption||The combustion engine is sized to operate at both low and high speeds and thus releases more pollution at low speeds.|
| ||Hydrostatic braking, acting as an integral retarder without using the service brakes or separate retarder||Friction braking wear|
To learn more about AddiDrive™ CreepDrive, contact your Spencer Fluid Power representative today 800-367-5646.