Mobile citybus air-conditioning

Mobile open and Semi-hermetic Compressors

for bus, train air conditioning and transport cooling

Today, air conditioning systems for buses and trains are required to provide optimum comfort for drivers and passengers. The highest possible energy efficiency for the vehicle and the best environmental compatibility are priorities. The focus is on heating the vehicles using environmentally friendly and emission-free heat pumps. The weight of the refrigeration system is important for the air conditioning of buses, trains or in transport cooling. When it comes to compressors, emphasis is placed on robust and smooth-running lightweights that also make a decisive contribution to increasing the efficiency of the overall system.

Thanks to their proven design and constant innovation, the mobile aluminum compressors from BOCK make an important contribution to environmental protection and ensure a good climate in buses and trains as well as in transport cooling.



BOCK open type vehicle compressors FK40 for mobile applications

BOCK vehicle compressors of the FK series are the result of decades of experience in the field of mobile refrigeration. The Bock compressor FK40 has now been on the market for more than 50 years and is the worldwide standard of the most renowned manufacturers in the field of bus air conditioning.

Product benefits - short overview :

  • Lightweight, compact, robust, wide speed range
  • Demand-oriented capacity regulation possible
  • Unique valve plate option
  • Product range with 2-, 4- and 6-cylinder reciprocating compressors
  • For individual cooling applications in a wide range of design variants possible


FK - compressors



Aluminium compressor BOCK HGX34e Front EN

The all-aluminum lightweight design of the HGX34 and HGX22 compressors compressors is ideal for mobile refrigeration and air conditioning applications. Compressor weight and compressor efficiency are critical. Thanks to the lightweight aluminum design, the mobile semi-hermetic compressors are 40% lighter than the standard compressor. System manufacturers in the field of bus-/railway air- conditioning and transport cooling are thus offered new possibilities.

BOCK mobile compressors are available in 2 and 4 pole versions. The 2-pole version of the HG34 offers a significant increase in performance with identical dimensions.

The compressors are available with a terminal box in reduced height and are more compact than the standard version. BOCK mobile aluminum compressors meet the highest fire protection class HL3 of EN45545 for railroad applications.


CO2 solutions for mobile applications

HR40 and HGX24 CO2 T

CO2 compressor- Starcompressor-HR 40-HR60 - closed
BOCK transcritical CO2 compressor HGX24 CO2 T

Bock StarCO2mpressor HR 40 - naturally innovative!
The innovative "star" engine design of the StarCO2mpressor opens up new possibilities in electric bus and rail air conditioning: space-saving roof installation thanks to the industry's lowest overall height and lightest weight. And energy-saving heat generation with heat pumps without auxiliary heater even at outside temperatures down to -20 °C.


The new CO2 compressor series HGX24 CO2 T 
With their wide operating limits and frequency ranges, the new gas-cooled BOCK CO2 semi-hermetic compressors offer economical solutions for many mobile applications. 
The particularly efficient transcritical CO2 compressors flexibly adapt the heating and cooling capacity to the requirements. Their wide range of applications enables customised, cost-saving solutions for the most diverse applications - and all this with the highest reliability and durability.