The development of the HL-A4VTG90 series of hydraulic pumps stems from the company’s more than ten years of global application experience in the construction machinery market. It is improved on the basis of the mature variable plunger pump to make it more suitable for use in the hydraulic transmission system of concrete mixer trucks. .
1. Product features:
Hydraulic components for industry mobile machinery;
Swashplate axial piston variable pump, suitable for closed loop hydraulic drive of mobile machinery;
The flow rate of the hydraulic pump is proportional to the speed and displacement of the pump;
The infinite variable can be realized by adjusting the angle of the swash plate;
When the swash plate swing angle passes through the zero position, the liquid flow changes smoothly;
Two relief valves on the high-pressure side protect hydraulic components [pumps and motors] from overloading
Built-in auxiliary pump as charge and control oil pump
The maximum charge pressure is limited by the built-in charge relief valve
Rated working pressure can reach 40MPa
Choose long-life high-precision bearings
Choose Parker seals
2. Specification:
Output flow: Q=Vg.n.ηv/1000 L/min
Torque: M=1.59Vg.△P/10ηmh N.m
Power: P=M.n/9549=Q. △P/60ηt Kw
Note: Vg=displacement Ml/r △P=pressure difference MPa n=speed rpm
ηv = volumetric efficiency ηmh = mechanical efficiency ηt = point efficiency
Three, technical parameters
| specification | HLA4VTG90 |
| Variable pump displacement Vgmaxcm3/r | 90 |
| Charge pump displacement Vg Sp cm3/r | 19.8 |
| Speed nmaxrpm | 3000 |
| Minimum speed nminrpm | 500 |
| Maximum flow when n=nmaxL/min | 270 |
| Maximum power when n=nmaxv=Vgmax△P=40MPa KW | 180 |
| Maximum torque when V=Vgmax△P=40MPa Nm | 572.4 |
| Shell oil volume V L | 1.5 |
| Weight Kg | 61 |
Hydraulic pump working pressure range
Working pressure range of imported oil [auxiliary pump]
Suction pressure Ps min: ≥0.08MPa absolute pressure
Working pressure range of working circuit port
a, variable pump
Nominal pressure P=40MPa Peak pressure Pmax=45MPa Total pressure [Pressure A+Pressure B]=70MPa
b. Auxiliary pump
Maximum pressure P=4MPa
Leakage port pressure range
Short-term [t﹤0.1s] allowable maximum pressure: P=0.6MPa
When working normally and for a long time, the case drain pressure P≦0.3 MPa
Precautions:
a. The pump body must be filled with oil during trial operation and kept full during work
b. In order to reduce noise, all connecting pipes are recommended to be isolated from the fuel tank with flexible components
c. When the hydraulic pump is continuously running at the rated pressure or the inter-peak pressure, auxiliary devices are required to cool the oil to ensure that the oil temperature does not exceed the specified range, and the temperature at any point in the oil circuit is not allowed to exceed 115°C.
Four, implementation standards
JB/T 7043-2006 hydraulic axial piston pump
