Excavator Final Drive Parts

A common excavator structure includes power unit, work unit, rotary mechanism, operating mechanism, transmission mechanism, travel mechanism and auxiliary facilities. Among them, the working device is the device that directly completes the excavation task. It consists of three parts, such as the movable arm, bucket bar and bucket, which are articulated. The moving arm, bucket bar and bucket rotation are controlled by reciprocating double-action hydraulic cylinder. In order to meet the needs of different construction operations, the excavator can be equipped with a variety of work devices, such as excavation, lifting, loading, leveling, clamping, bulldozing, impact hammer and other operational tools. The rotary and walking device is the body of the hydraulic excavator, and the upper part of the turntable is equipped with a power unit and transmission system. The engine is the power source of the excavator, mostly using diesel to be in a convenient site, can also be replaced with electric motors. Transmission mechanism through the hydraulic pump will be the power of the engine to the hydraulic motor, hydraulic cylinder and other executive components, to promote the work device action, so as to complete a variety of operations. This article mainly introduces the final drive part of the excavator transmission structure.

What is a Final Drive on an Excavator?

The final drive parts consists of the power unit and reduction part of the excavator. There are two final drives on the machine, left and right, which directly drive the tracks to enable the machine to move forward, backward and turn. The tracks on both sides of the excavator are independently driven, with no mechanical connection to the engine, which drives the fuel pump, and the vast majority of current bulldozers are mechanically driven and cannot be steered in place.

What are the Parts of the Excavator Final Drive

The final drive is composed of hydraulic motor, sincere speed box, brake valve, parking brake and other components.

The role of hydraulic motor hydraulic motor is swashplate axial piston motor, the hydraulic oil from the main pump hydraulic pressure into the rotary motion of the rotary torque
The role of the brake valve (brake reading including safety suction valve, balance valve) when the main valve spool back to the neutral position, due to the inertia of the car body and the motor continues to rotate, the motor plays the role of the pump, so that the return side of the high pressure back pressure, forcing the motor to stop rotating, so that the brake.
The role of the parking brake parking brake is a friction plate type braking mechanism, and hydraulic motor part of the integrated structure.

When the excavator is parked on the sloping ground, to avoid causing skidding, slipping phenomenon.

How Does a Final Drive Work on an Excavator

1.Unbrake

Operate the walking lever, the hydraulic oil from the control valve through the small hole on the balance valve into the balance valve, so that the balance valve moves upward, the pressure oil into the cavity A of the brake piston in the direction of the arrow, the spring counteracts the force of the friction plate and pressure plate, the brake is lifted.

2.When walking

The pressure oil from the control valve is delivered to the oil port, the pressure oil flows to the cavity S1 through the throttle hole in the balance valve, the balance valve moves to the right in the direction of the arrow, at the same time, the pressure oil from the oil port pushes open the safety suction valve. Flow into the running motor oil port and out from the oil port, drive motor rotation, the pressure oil from the oil port flow back to the oil port in the direction of the arrow.

3.When stop walking

When walking lever back to the neutral position, the motor into the oil port is cut off, S1 cavity pressure drop, the balance valve returns to the neutral position, out of the oil port channel oil circuit is cut off, the friction plate and pressure plate is spring pushed together to produce braking.

4.Adjustment of motor speed

When the flow rate of the pump remains unchanged, the motor speed can be changed by changing the angle of the motor swashplate.