The fluid couplings of Transfluid provide a solution where a start-up must be performed in a controlled way without shock loads. Damage and premature wear and tear on the engine and machine are prevented because the torque is transferred by the fluid and the impellers.
Esco Aandrijvingen provides a complete assortment of fluid couplings for diesel engines and electric drives.
The fluid coupling is a Hydro Kinetic Transmission.
The impellers act like a centrifugal pump and a hydraulic turbine. With a drive on the pump side (e.g. electric motor or diesel engine) the kinetic energy is transferred to the impeller on the input side. The oil moves through the centrifugal force over the blades to the outside of the coupling. The kinetic energy of the oil is transferred on the turbine impeller and therefor transfers torque and speed. The wear is practically nil because there is no mechanical contact. The efficiency is only affected by the speed difference (slip) between pump and turbine.
The slip is essential for the operation of the coupling: there can be no torque transfer without the slip! The formula for slip, from which the loss can be deduced is as follows:
In normal conditions the slip can vary between 1.5% (high power) up to 6% (low power).
The K-Series fluid coupling is a “Constant Fill” type and consists of three main elements:
The MPD and SPD pump drive is an innovative module that fits between engine and transmission. With this module it is possible to drive several hydraulic pumps, with the required power coming directly from the engine’s flywheel. The MPD or SPD are mounted directly on the SAE housing and SAE flywheel.
|Size||SAE Input||SAE Output||Weight||Quantity of oil (ltr)||Max. RPM||Max. Torque Input (Nm)||Total Power Pump outputs (kW)||Power per pump output (kW)||Ratio|
|18||1 - 14"||1 - 14"||350||18||2200||3350||300||120||1.0 en 0.88|
|22||1 - 14" en 0 - 18"||0 - 18"||530||35||2100||6300||400||175||0.95|
Rubber Block Drives are flexible couplings between the engine’s flywheel and the powered unit, such as generators, pumps and compressor sets, and mobile applications such as forklifts and earthmoving machines.
RBD couplings have many advantages:
Easy assembly, low weight and short fitting. The drives are also supplied with standard SAE flanges for easy installation.
Coupling can be provided:
Construction of the coupling:
The coupling has internal and external teeth. Between the teeth are blocks of special compound rubber. The external ring, of aluminum, has a profile that corresponds to the rubber molded compound and can be mounted directly on the output flange. This method makes it possible to capture small angle and radial alignment errors.
A KPTO is a fluid coupling which is connected to the diesel engine by means of a SAE housing. The coupling meets the demand for the technical characteristics of a conventional PTO but with the performance of a fluid coupling. The KPTO has an internal pump which is powered by the diesel engine. With a remote control on-off valve, the fluid coupling can be controlled at variable speeds.
Benefits of the KPTO liquid coupling:
The SRBD is designed to connect a pump directly to the engine using a SAE housing and Rubber Block Drive.
Transfluid is the market leader in the design and production of fluid couplings. The company was founded in 1957 and now produces more than 10,000 couplings per year. Pump drives, transmissions and PTOs are part of the program. Hybrid drives have also been developed recently. Contact Esco Aandrijvingen for your enquiries about fluid couplings.