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Selection and Technical Analysis of the Type of Main Hydraulic Pump for Vehicle-Mounted Pumps
Release time:
2026-01-26
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Summary:
In the hydraulic system of on-vehicle pumps, the main hydraulic pump serves as the power source for the entire system, and its performance directly determines the pump’s overall pumping capacity, efficiency, energy consumption, and reliability. Among the many types of hydraulic pumps available, the main pump for on-vehicle pumps is not chosen arbitrarily; rather, it represents the optimal selection based on the pump’s demanding operational requirements—high pressure, large flow rate, variable displacement, and long service life. Currently, mainstream global manufacturers of on-vehicle pumps generally adopt... ** Axial piston pump ** As the main hydraulic pump, this has become a technological consensus within the industry.
I. Why have axial piston pumps become the mainstream choice?
The axial piston pump’s success stems from its array of outstanding features, which closely match the operating conditions of on-vehicle pumps:
1. High working pressure and power density: The pumping system of on-vehicle pumps needs to overcome the substantial pipeline resistance of concrete, and the working pressure typically reaches as high as... 30-40MPa even higher. The structural design of the axial piston pump enables it to withstand and efficiently deliver such high pressures while maintaining a compact footprint, providing tremendous power output—i.e., high power density—within limited installation spaces. This makes it ideally suited for the space-constrained layout requirements of on-board equipment.
2. Variable displacement control: This is the most critical advantage of using piston pumps in vehicle-mounted pumps. By means of a variable mechanism (such as a swashplate or swash shaft), the pump’s displacement—i.e., the volume of fluid discharged per revolution—can be continuously adjusted. This means:
Matching Engine Power: The system can automatically adjust the displacement in response to changes in pumping load, ensuring that the hydraulic pump’s absorbed torque always matches the engine’s rated torque curve. This effectively prevents the engine from stalling or shutting down due to sudden load changes, thereby maximizing engine power utilization and achieving energy savings.
Achieves stepless flow rate adjustment: Without changing the engine speed, the pump’s displacement can be adjusted to precisely control the pumping speed—whether it’s slow, precise pouring or rapid pumping—offering flexible operation and lower fuel consumption.
3. High volumetric efficiency and service life: The plungers and cylinder bores are sealed with precision clearances or distribution plates, minimizing leakage. Even under high pressure, the pump maintains a high volumetric efficiency—defined as the ratio of actual flow rate to theoretical flow rate—meaning less energy loss and higher pumping efficiency. The core friction pair has been specially designed and treated for excellent wear resistance and a long service life.
4. Wide range of variable modes: Multiple variable control methods, such as pressure cut-off, constant power, and electro-proportional control, can be easily implemented according to control requirements. These modes are readily integrable with modern intelligent control systems, enabling precise power matching and sophisticated control strategies.
II. Why are other types of pumps not suitable for the role of a main pump?
To better understand this choice, we can compare it with the limitations of other common pump types:
Gear pumps: Although they feature a simple structure, low cost, and strong resistance to contamination, their working pressure and volumetric efficiency at medium and high pressures are typically lower than those of piston pumps. Most critically, conventional gear pumps are fixed-displacement pumps, making it difficult for them to achieve the crucial variable-function capabilities mentioned above. As a result, they cannot meet the core requirement of on-board pumps for power-adaptive regulation. Therefore, gear pumps are usually employed as auxiliary pumps in on-board systems—such as oil-supply pumps or pilot-control pumps.
Vane pumps: Also feature variable capacity and lower noise levels. However, their maximum working pressure and resistance to contamination are typically inferior to those of piston pumps, making them less capable of handling the extremely harsh operating conditions and pressure surges involved in concrete pumping. As a result, they do not offer an advantage in terms of durability and reliability.
III. Two Mainstream Structures of Axial Piston Pumps
Even within the category of axial piston pumps, there are two main structural types:
1. Swashplate axial piston pump: The displacement is varied by changing the tilt angle of the swashplate, thereby altering the stroke of the pistons. This is currently the most widely used design; it boasts mature technology, rapid variable response, and diverse control methods.
2. Swashplate axial piston pump: Variable displacement is achieved by changing the swashplate angle of the cylinder block. This design typically features higher strength and operating pressure, as well as greater resistance to impact loads. However, its structure is relatively complex, and it may be slightly larger in size and weight.
Both structures have been successfully applied to vehicle-mounted pumps. Different manufacturers may choose based on their own technological heritage and design preferences, but the core principles and advantageous variables of the two are common to both.
Conclusion
Selecting an axial piston pump as the main hydraulic pump for vehicle-mounted pumps represents the optimal solution in engineering practice. This choice is no accident—it stems from its... ** High pressure, high efficiency, and especially flexible stepless variable capability. ** As determined, these characteristics perfectly match the dynamically varying load conditions of on-board pumps and the need for precise management of engine power. Although its structure is complex, its manufacturing costs are higher, and it places stricter demands on oil cleanliness, the outstanding performance, fuel economy, and overall reliability it delivers make it an irreplaceable core component. This technological approach clearly reflects the development trend toward high performance and intelligence in the construction machinery industry.
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