Hard and hard matched helical gear pair with large helical angle and few teeth and application of helical gear pair

Abstract

The invention relates to a hard and hard matched helical gear pair with large helical angle and few teeth. A driving gear and a driven gear are identical in tooth profile and opposite in rotation direction, the driving gear is made of a metal material, the driven gear is a metal inner core, and the metal inner core is coated with a layer of elastomer material. The invention further provides an extremely few-tooth bevel gear water pump comprising the bevel gear pair. The extremely few-tooth bevel gear water pump is particularly suitable for ships. Firstly, the surface of the driven gear is coated with a layer of elastomer, soft and hard contact and interference fit of the driving gear and the driven gear are achieved, and the efficiency of the water pump and vibration and noise in the operation process can be effectively improved; a pump body structure in central symmetry and the helical gear pair in full symmetry can realize bidirectional work; and the design of a large wrap angle and few teeth can guarantee that large flow is obtained at a low rotating speed, output reliability is guaranteed, and an unloading groove matched with the pump body structure can reduce inflow and outflow resistance, solve the oil trapping phenomenon and reduce noise at a high rotating speed.

Description

technical field [0001] The invention relates to a helical gear pair structure, in particular to a helical gear pair with a large helix angle and very few teeth and its application. Background technique [0002] The helical gear pump with very few teeth is a kind of external meshing gear pump. It relies on the volume change of the meshing space of the gear teeth to transport liquid, and belongs to the rotary positive displacement pump. When the gear pump is working, the driving gear rotates with the motor and drives the driven gear to rotate accordingly. When the meshing teeth on one side of the suction chamber are gradually separated, the partial vacuum formed by the gradual expansion of the meshing chamber can produce a self-priming effect, and the liquid in the pipe is sucked into the pump; the suction liquid is pushed to the discharge by the gear in the tooth groove in two ways. room. After the liquid enters the discharge chamber, due to the continuous meshing of the te...

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Problems solved by technology

[0003] However, positive displacement pumps have higher requirements for leakage when transporting low-viscosity fluids such as water; in addition, because water is less compressible than oil, it is also more sensitive to oil trapping

When a general gear pump is used as a water pump, it is difficult to obtain the effect of large flow and high pressure head

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