ZF Ecomat
Encyclopedia
The ZF Ecomat automotive
Automotive industry
The automotive industry designs, develops, manufactures, markets, and sells motor vehicles, and is one of the world's most important economic sectors by revenue....

 transmission
Transmission (mechanics)
A machine consists of a power source and a power transmission system, which provides controlled application of the power. Merriam-Webster defines transmission as: an assembly of parts including the speed-changing gears and the propeller shaft by which the power is transmitted from an engine to a...

 was specifically designed by ZF Friedrichshafen
ZF Friedrichshafen
ZF Friedrichshafen AG, also known as ZF Group, and commonly abbreviated to ZF, is a German public company headquartered in Friedrichshafen, in the south-west German region of Baden-Württemberg....

 AG
Aktiengesellschaft
Aktiengesellschaft is a German term that refers to a corporation that is limited by shares, i.e. owned by shareholders, and may be traded on a stock market. The term is used in Germany, Austria and Switzerland...

 primarily for city-bus
Bus
A bus is a road vehicle designed to carry passengers. Buses can have a capacity as high as 300 passengers. The most common type of bus is the single-decker bus, with larger loads carried by double-decker buses and articulated buses, and smaller loads carried by midibuses and minibuses; coaches are...

es and motorcoaches
Coach (vehicle)
A coach is a large motor vehicle, a type of bus, used for conveying passengers on excursions and on longer distance express coach scheduled transport between cities - or even between countries...

. It has several generations - all of the automatic transmission
Automatic transmission
An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...

 type, and many variants. The latest variants utilise a lock-up torque converter
Torque converter
In modern usage, a torque converter is generally a type of hydrodynamic fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor, to a rotating driven load...

 along with a retarder
Retarder (mechanical engineering)
A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles....

. Some variants are listed below.

Gear ratios

123456R
3.43
(or 2.81:1 on early models Pre-1986)
2.01 (or 1.84:1 on early models Pre-1986) 1.42 (or 1.36:1 on early models Pre-1986) 1.00 0.83
(optional)
0.59
(optional)
4.84

1st generation — Ecomat (1980-2002)

All of these original Ecomat variants are no longer in production.
  • 4HP-500 / 5HP-500 / 6HP-500 — four-, five- or six-speed; maximum input torque
    Torque
    Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

     of 1100 Nm
  • 4HP-590 / 5HP-590 / 6HP-590 — four-, five- or six-speed; maximum input torque of 1250 Nm
  • 4HP-600 / 5HP-600 / 6HP-600 — four-, five- or six-speed; maximum input torque of 1400 Nm

2nd generation — Ecomat 2 (1997-2007)

All four-speed variants (4HP-502, 4HP-592, 4HP-602) are discontinued. The five- and six-speed variants remain in production
  • 4HP-502 / 5HP-502 / 6HP-502 — four-, five- or six-speed; maximum input torque
    Torque
    Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

     of 1100 newton metres (811 ft·lbf)
  • 4HP-592 / 5HP-592 / 6HP-592 — four-, five- or six-speed; maximum input torque of 1250 newton metres (922 ft·lbf)
  • 4HP-602 / 5HP-602 / 6HP-602 — four-, five- or six-speed; maximum input torque of 1600 newton metres (1,180 ft·lbf)

3rd generation — Ecomat 4 (2006-2012?)

  • 5HP-504 / 6HP-504 — five- or six-speed; maximum input torque
    Torque
    Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

     of 1100 newton metres (811 ft·lbf)
  • 5HP-594 / 6HP-594 — five- or six-speed; maximum input torque of 1250 newton metres (922 ft·lbf)
  • 5HP-604 / 6HP-604 — five- or six-speed; maximum input torque of 1750 newton metres (1,291 ft·lbf)

Use in rail vehicles

In addition to its use in road vehicles, the Ecomat transmission is also employed in the Class 172
British Rail Class 172
The Class 172 is a type of diesel multiple unit of the Turbostar family, similar to the Class 168, Class 170 and Class 171.-Technical details and variants :There will be four sub-types:*Class 172/0 - two-car units in operation with London Overground...

 lightweight diesel multiple unit
Diesel multiple unit
A diesel multiple unit or DMU is a multiple unit train consisting of multiple carriages powered by one or more on-board diesel engines. They may also be referred to as a railcar or railmotor, depending on country.-Design:...

 (DMU) trains in service with various operators in Great Britain
Great Britain
Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

.
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