Closed-loop hydrostatic drive

A closed-loop hydrostatic drive, also referred to as a hydraulic drive, is a type of power transmission system that uses hydraulics to transfer power and regulate the speed of a machine or vehicle.

It consists of three main components: a hydraulic motor, a hydraulic pump, and a control system.

Hydraulic pump in hydrostatic drive

A hydraulic pump is driven by a power source, such as a combustion engine or an electric motor. The pump draws in hydraulic fluid and delivers it under high pressure. The pressure generates the power that is transferred to the hydraulic motor. We often use the Bosch Rexroth hydrostatic pump A4VG, which is an axial piston pump.

Hydraulic motor in hydrostatic drive

A hydraulic motor receives the high-pressure hydraulic fluid from the pump and converts the hydraulic energy into mechanical power and rotation. The hydraulic motor is connected to the driven wheels, components, or moving parts of the machine or vehicle. By adjusting the speed and direction of the incoming hydraulic fluid, the hydraulic motor can be controlled, thereby changing the machine’s speed and direction. We often use the Bosch Rexroth hydraulic motor A6VM, which is an axial piston motor.

Control system in hydrostatic drive

The control system regulates the flow of hydraulic fluid between the pump and the motor in order to change the speed and direction of the machine or vehicle. It may consist of various components such as valves, regulators, and control signals from the operator’s controls or computerized control systems.

Hydrostatic drive: Quick response, smooth acceleration, and high torque

The advantages of hydrostatic drives include:

• Smooth acceleration
• Quick response
• Independent control of speed and direction
• Capability to transmit high torque

They are used in many applications that require control of speed and movement, including tractors, excavators, forestry machines, construction machinery, and vehicles such as lawn mowers and snow plows.

Difference between hydrostatic drive and mechanical transmission

It is important to note that a hydrostatic drive differs from a mechanical transmission, where power is transferred through mechanical couplings and gears. In a hydrostatic drive, the power is transferred through hydraulic pressure and flow instead of mechanical components.

Contact Hydnet to find the optimal solution for your machine!