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Methods and standards for checking the engagement of gear pump gears
Gear pump gear meshing conditions are mainly reflected in two aspects: the gear of the contact spots and backlash. Contact speckle reaction gear accuracy of contact, inspection can be evenly coated with a thin layer of red lead on a gear, in the case of a slight brake, according to the direction of rotation of the gear, and then, in the uncovered red gear , Observe the contact spots and calculate the contact ratio on the flats of the tooth flats as a percentage. The specific criteria are as follows: The meshing contact spots should be uniformly distributed above and below the pitch circle line, the contact area should be greater than 60% along the tooth width, Greater than 45%. Check the gear backlash available pressure lead method, that is, with the right diameter and length of the lead wire, along the direction of conveying fluid, from the entrance into the gear between the deputy, after meshing squashed, remove lead wire from the outlet, with a micrometer The thickness of the lead wire at the pitch point of the gear after crushing is measured. The sum of the thickness of the lead wire on both sides of a tooth is the backlash of the gear. See Table 1 - 1 for the standard. Table 1--1 Gear pump gear meshing backlash Reference data / mm Center Moment Clearance Clearance ≤50 51 ~ 80 81 ~ 120 121 ~ 200 0.085 0.1050 0.13 0.17 0.20 0.25 0.30 0.35