A2F Series Inclined Axial Pump

A2F Series Inclined Axial Piston Pump/Motor Overview:

Pump or motor with a fixed displacement, used for static pressure transmission in either open or closed systems.
When used as a pump, flow rate is proportional to the speed and displacement.
When used as a motor, the output speed is directly proportional to the displacement and inversely proportional to the pressure difference between the high and low pressure sides. The output torque increases with the increase in the pressure difference between the high and low pressure sides.
The drive shaft can withstand radial loads.
The cylinder and oiling plate utilize spherical oiling, which can automatically center during rotation, featuring lower circumferential speed and high efficiency; low noise.

Model Description

Series Specifications  

Terms of Use 

Axial piston element with a bent shaft structure, featuring a fixed displacement, used as a pump or motor for static night drive in either open or closed-loop systems.
2. When operating as a pump, the flow rate is proportional to the driving speed and displacement.
3. When operating as a motor, the output speed is directly proportional to flow rate and inversely proportional to displacement. The output torque increases with the pressure difference between the high and low-pressure sides.

Structural Section 

Series 1-4, Specifications 10-160

Series 5, Specifications 200-500

Fault Handling  

Repairing pumps involves different methods tailored to various symptoms. For pumps that meet pressure standards but have low flow rates (slow operation), the main focus is on checking the clearances of the pump's variable mechanism parts, such as inspecting the fit between the variable piston and the pump housing bore. The standard clearance between the large diameter and small diameter of the variable piston and the pump housing bore is 0.008mm. The large clearance is 0.032mm. When exceeding the large clearance, the repair involves restoring to the standard clearance. The repair method uses a grinding rod to grind the bore and increase the piston diameter. The large clearance bore is typically narrow at the mouth and wide at the bottom, so the grinding process must ensure that the post-grinding bore does not exhibit a tapered hole. The large and small holes must maintain coaxiality, with specialized grinding rods custom-made by professional factories. When the piston needs an increased outer diameter, the method of ultrasonic flame spraying metal ceramic is used, adding a black, wear-resistant ceramic layer to the piston diameter. This black ceramic layer is particularly wear-resistant and represents advanced surface engineering technology in the world today. However, the price is also very high, up to 3-4 times more expensive than conventional methods. For pump shaft rotating oil seals that have worn into grooves, this method is used for repair. Alternatively, the following two methods can be employed: 1) electroplating a hard chrome layer, which requires first removing approximately 0.15mm of the rod's outer diameter surface using an external grinding machine to eliminate the metal surface fatigue layer, ensuring the bonding strength of the plating. The electroplated layer must be greater than 0.1mm thicker than the bore diameter to ensure sufficient material for machining.

Operating Principle 

1. Pump operating condition
The pump's function is to convert mechanical energy into hydraulic energy. As the motor drives the pump's main shaft to rotate, the connecting rod and plunger move the cylinder body. Due to the angle between the cylinder body's axis and the main shaft's axis, the plunger reciprocates within the cylinder. This causes a volume change in the cylinder's plunger bore. When the volume increases, the medium is drawn into the pump's intake port and enters the plunger bore through the low-pressure window of the distribution plate; when the volume decreases, the medium is expelled from the pump's discharge port through the high-pressure window of the distribution plate. Thus, with one complete rotation of the main shaft, each plunger bore completes one intake and discharge cycle.
2. Motor operating conditions
The motor converts hydraulic energy into mechanical energy. As high-pressure oil enters the cylinder piston bore through the high-pressure window of the manifold plate and the inlet of the motor, it pushes the piston, causing it to move. Due to the angle between the cylinder and the main shaft axes, the hydraulic pressure acts on the main shaft via the connecting rod, generating a tangential force that rotates the main shaft and outputs torque. The oil that has done its work is then ejected from the piston bore, thanks to the inertia of the cylinder, through the low-pressure window of the manifold plate, and排出 from the motor's exhaust port.

Power Calculation  

Appearance dimensions