New K3V hydraulic pump

The K3V hydraulic pump is a variable displacement axial piston pump of swash plate design developed by Kawasaki Heavy Industries. Here are its main features and aspects:

1. Technical characteristics:

High power density: It can provide relatively high power output in a relatively compact size, which is beneficial for applications where space is limited but high power is required, such as in construction machinery.

High suction capability: Possesses good suction performance, ensuring the stable supply of hydraulic oil and the normal operation of the hydraulic system even in complex working conditions.

High reliability: With a reliable structure and manufacturing process, it can work stably for a long time in harsh working environments, reducing the failure rate and maintenance costs for users.

Wide range of control options: Can be equipped with various control systems, such as total power control, negative flow control, power conversion control, and load sensing control, to meet the different needs of different working conditions.

2. Structure:

It mainly consists of a cylinder block, plungers, a swash plate, and a servo mechanism. The cylinder block contains multiple cylinders, and the plungers are fitted inside the cylinders. The swash plate is connected to the servo mechanism and can change its angle to adjust the displacement of the pump.

3. Applications:

Widely used in various mobile applications such as excavators, wheel loaders, crawler drills, pile drivers, cranes, crushers, and concrete pumps. For example, in an excavator, the K3V hydraulic pump provides power for the movement of the boom, arm, bucket, and other components, ensuring the efficient operation of the excavator.

4. Displacement and pressure:

Different models of the K3V hydraulic pump have different displacements and pressure ratings. For example, common models like K3V63, K3V112, K3V140, and K3V180 have specific displacement and pressure parameters to meet the requirements of different equipment. The rated pressure is usually around 34.3 MPa, and the peak pressure can reach 39.2 MPa.

The K3V hydraulic pump is a variable displacement axial piston pump, and its working process is as follows:

1. Suction process:

The pump has a rotating assembly which includes a cylinder block and plungers. As the cylinder block rotates, when the plungers move to the position where the volume inside the cylinder block increases (i.e., when the plungers move from the top dead center to the bottom dead center in the cylinder), a negative pressure is generated inside the cylinder. At this time, hydraulic oil from the oil tank is sucked into the cylinder through the inlet port of the pump.

2. Discharge process:

As the cylinder block continues to rotate, the plungers start to move in the opposite direction, and the volume inside the cylinder block decreases (i.e., when the plungers move from the bottom dead center to the top dead center). This compresses the hydraulic oil inside the cylinder, and the high-pressure hydraulic oil is then discharged from the outlet port of the pump to the hydraulic system for driving various hydraulic actuators.

3. Control of swash plate angle for variable displacement:

The K3V hydraulic pump can change its output flow by adjusting the angle of the swash plate. The angle of the swash plate is controlled by a regulator. When the regulator adjusts the hydraulic pressure acting on the servo piston, the servo piston moves. Since the swash plate is connected to the servo piston through a mechanism such as a tilting pin, the movement of the servo piston causes the swash plate to change its angle.

For example, when the hydraulic pressure acting on the servo piston increases, the servo piston moves in a certain direction, causing the swash plate angle to increase. As a result, the stroke of the plungers during rotation becomes longer, and the pump's output flow increases. Conversely, when the hydraulic pressure on the servo piston decreases, the swash plate angle decreases, and the pump's output flow decreases.

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