HOW IS THE DIFFERENCE BETWEEN HYDRAULIC SPEED VARIATOR AND MECHANICAL VARIATOR?

VAR-SPE HYDRAULIC SPEED VARIATORS

Many customers ask to us which are the differences between hydraulic and mechanical variator: we thought to create a summary sheet with the main characteristics.

VARSPE VARIATORS: Working Principle

Var-Spe Hydraulic speed variator has a main circuit composed by primary and secondary pumps. Both units are housed in the same case, and they are mounted on a fixed distributor shaft.

Speed regulation is accomplished by adjusting the eccentricity of the primary pump and, therefore, the oil flow is sent to the secondary pump (with fixed eccentricity). The latter, connected to the output shaft, drives a speed that is directly proportional to the received oil flow.
So, the max eccentricity of primary pump corresponds to the max speed rotation of output shaft, smaller eccentricity will correspond to a lower output speed rotation. (see Image Nr. 2)

MECHANICAL VARIATOR : Working Principle

The mechanical variable speed transmission system is based on the transfer of power, by friction, beetween a moving part (moved by the control speed), drive and driven shafts.

THE TWO VARIATORS CHANGE THE SPEED IN TWO DIFFERENT WAY BUT

OUR VARIATORS HAS THESE ADVANTAGES:

EASY MAINTENANCE: the fully lubricated circuit creates an oil film that PRESERVES from wearing down all internal components, the minimal MAINTENANCE is the replacement of the oil that allows A VERY VERY LONG LIFE of the hydraulic variator, internally the components have No MECHANICAL STRESS ..NO FRICTION
SAFETY of Varspe variators: each VARIATOR is equipped with safety valves that are involved in case of the blocking of the machine… basically in case of stop the valves allow the discharge of oil into the variator case
SPEED CONTROLS: we have a very different range of speed controls: handwheel, pneumatic, electric, lever, ELETTROTRONIC. We can customize the VARIATORS acc. to the customer’s requests, depending on the application, type of environment, etc.

VARSPE covers the power till 22 KW HEAVY SERIES (generally Mechanical Variator arrives to max 9,2 KW)
WIDE RANGE OF SPEED : speed range from 0 to 1500 / 1750 RPM
FAST INVERSION IN BOTH SENSES OF ROTATION
Possibility to adjust the speed also with el. motor switched OFF

FINALLY… OUR VARIATOR IS THE ONLY VARIATOR THAT HAS THIS TYPE OF WORKING PRINCIPLE.