ENGINES
HATZ
An evolution in
engine building
GERMAN FIRM HATZ HAS REDEFINED INDUSTRIAL DIESEL
ENGINES FOR SMALL AND MEDIUM-SIZED MACHINES
Industrial diesel engines have been used
for decades in all kinds of machinery.
They do their work well. But the time came to
rethink the classic industrial diesel engine from
the ground up. This was because the partial
developments to existing engine platforms
could no longer do justice to the great challenges
and demands in the long term. Hatz took on
this task and redefined industrial diesel engines
for small and medium-sized machines with its
Hatz H-series.
Hatz H-series engines – the Hatz
Applicationizers – are a product of the company’s
long-standing expertise and innovation.
Fundamental inventions such as the flat-seat
injection nozzle of 1926 or the first industrial
diesel engine made from aluminium in 1958
mark only two of Hatz’s many great moments.
The engine specialist has once again set an
industry-wide milestone in innovation and
development with the H-series three- and fourcylinder
diesel engines.
Why the Applicationizer? Because the Hatz
engines of the H-series constitute a completely
new diesel drive generation, which elevates offhighway
applications to the next evolutionary
52 iVT International Off-Highway 2020
level. The three- and four-cylinder diesel engines
boast impressive features such as high specific
power, efficiency and torque with less
displacement, lower weight, smaller size, lower
fuel consumption and lower emissions. The new
engine class was achieved by adhering to a
consistently implemented downsizing principle
combined with first-class components
throughout the unit. These include sturdy, highly
effective turbochargers and Bosch’s special offhighway
common rail injection system.
Other components, for example from
Mann+Hummel, Mahle, Behr and
Kolbenschmidt/Pierburg, are top-quality
supplements to the Hatz engine design.
Versatile deployment
The Applicationizer’s diversity of variations is
based on one engine family with two platforms,
the three- and four cylinder H-series. Both the
three- and four-cylinder engines are based on the
same basic design with a thin-wall cast cylinder
crankcase, a die-cast aluminium cylinder head
with cross-flow cooling and the over head value
(OHV) two-valve concept with a decentralized
injector position.
The Hatz product range includes various
derivatives and development levels of the two
basic engines in order to provide the ideal engine
for almost every machine type. This gives
machine manufacturers a great deal of choice
when it comes to power versions, emission classes
or engines with special casings for weather
protection and noise insulation. A total of eight
engine variations are available, which drive
machines with up to 64 kW and the most
innovative technology.
Lowest emissions
Apart from complying with EU Directive
2016/1628 (EU Stage V) in force since 2019, the
requirements of the US Environmental
Protection Agency (EPA) Tier 4 final were
naturally also included in the engine redesign.
Several aspects were decisive in this regard. One
of them was the very low vibration level of the
drive, which was realized despite deliberately
dispensing with a balancer shaft. As a result, it
was not only possible to keep the size and weight
down, but also to minimize friction losses along
with the accompanying fuel consumption and
associated CO2 emissions.