Gear pump eccentric axial force compensation structure

Abstract

The invention relates to a gear pump eccentric axial force compensation structure. A certain gap is formed between an outer circle of a floating bearing and the cavity wall of a gear pump shell, high-pressure fuel oil at a gear outlet can be introduced into an eccentric ring cavity which is formed by the tail of the floating bearing and the shell, the tail of the floating bearing is provided witha plurality of spring holes, and a plurality of floating springs are arranged in the spring holes. In a starting state, by means of the spring force, it is guaranteed that the end face of the floatingbearing presses a gear, the force pushing away the floating bearing is increased along with the increasing of the pressure at the outlet, the pressure in the eccentric ring cavity of the floating bearing is increased along with the increasing of the pressure at the outlet, meanwhile, the force pressing a side plate is also increased, and therefore end face compressing is guaranteed, and the volume efficiency is improved. Specific eccentric values need to be set for the center of the eccentric ring cavity and the center of a gearing shaft neck / the floating bearing, it is guaranteed that a resultant action line of the hydraulic force of the eccentric ring cavity coincides with a resultant action line of the hydraulic force among teeth of the gear, inclination of the floating bearing is prevented, and the volume efficiency of a gear pump is improved.

Description

technical field [0001] The invention belongs to the end surface floating compensation technology of a gear pump, and relates to an eccentric axial force compensation structure of a gear pump. Background technique [0002] As we all know, the existing end surface floating compensation technology of gear pumps is generally partition compensation. With this compensation method, hydraulic pressure and spring pressing force act on the side plate facing away from the gear. In the starting state, the spring force ensures that the side plate is pressed against the gear, and in the large state, as the outlet pressure increases, the force to push the side plate increases, and the force to press the side plate also increases, thereby ensuring The end face is pressed tightly, the volumetric efficiency is increased, and because of the fuel lubrication, it does not produce a large power loss, so it is widely used. [0003] The gear pump end surface floating compensation used in the prior...

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Problems solved by technology

[0003] The gear pump end surface floating compensation used in the prior art has certain shortcomings: the side plate and the bearing are of a separate structure, and the side plate needs to be equipped with multiple partitioned oil chambers, and spring floating, rubber pad seals, oil introduction holes, etc. Structure, complex structure, cumbersome assembly, relatively low reliability

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