Table 1.
Characteristics of the pump.
Fig 1.
Diagram of the measurement setup, where: 1 – oil tank on the suction side, 2 – flowmeter, 3 – gear pump, 4 – torque meter with rotational speed measurement function, 5 – electric motor, 6 – relief valve, 7 – throttle valve, 8 – pressure gauge, 9 – oil tank on the discharge side.
Table 2.
Measurement accuracy of the devices used in the experiment.
Table 3.
Mechanical fits for gear-to-housing interfaces in the test pump.
Fig 2.
Actual view of the inside of a gear pump symbol 1.40.09.00.105 manufactured by Agricola Hydraulika Siłowa Sp. z o. o. Sp. k. from (Lubień Kujawski, Poland): a) view of the pump after splitting, b) view of the bearing housing with the pumping chamber, c) view of the gear wheel, d) vertical view of the gear wheel with the bearing housing.
Table 4.
Characteristics of the Tested Oils.
Fig 3.
Dependent and independent variables in the experimental study.
Table 5.
Results of the measurements of torque T, rotational speed n, and mechanical power P on the input shaft of the gear pump depending on the type of oil (no. 1–16) and pumping pressure, where: avg – average value,p = 0.05 – the confidence interval.
Fig 4.
Energy consumption at the input shaft of the gear pump depending on the pumped oil pressure and type of oil, at the recommended pump speed for continuous operation (2000 rpm).
Fig 5.
The kinematic viscosity values for the tested oil samples at temperatures of 25°C and 50°C, as well as the energy consumption during oil transfer at a pressure of 20 MPa and a gear pump speed of 2000 rpm.
Fig 6.
Energy consumption of the gear pump at a rotational speed of 2000 rpm and a pressure of 20 MPa during the transfer of oils with varying kinematic viscosities at temperatures of 25°C and 50°C.
Fig 7.
The kinematic viscosity values for the tested oil samples intended for internal combustion engines at temperatures of 25°C and 50°C, as well as the energy consumption during oil transfer at a pressure of 20 MPa and a gear pump speed of 2000 rpm.
Fig 8.
The kinematic viscosity values for the tested hydraulic oil samples at temperatures of 25°C and 50°C, as well as the energy consumption during oil transfer at a pressure of 20 MPa and a gear pump speed of 2000 rpm.
Fig 9.
The kinematic viscosity values for the tested gear oil samples at temperatures of 25°C and 50°C, as well as the energy consumption during oil transfer at a pressure of 20 MPa and a gear pump speed of 2000 rpm.
Fig 10.
The kinematic viscosity values for the tested oil samples intended for two-stroke engine fuel mixtures at temperatures of 25°C and 50°C, as well as the energy consumption during oil transfer at a pressure of 20 MPa and a gear pump speed of 2000 rpm.
Fig 11.
The comparison of energy consumption for pumping oils intended for machinery and vehicles using a gear pump, with distinct areas (ellipses) highlighted based on oil application, is presented.
Table 6.
ANOVA results, showing: degrees of freedom (df), F-statistic values, and p-values for each factor.