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A critically meshing gear pair in unit modulus of a light-weight gear pump

A technology of meshing gears and gear pairs, which is applied in the field of unit modulus gear pairs for pumps, can solve problems such as incomprehension and acceptance, and achieve the effect of reducing stiffness performance

Active Publication Date: 2019-11-19
SICHUAN WUHUAN PETROCHEM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optimum design technology is still difficult for general engineering and technical personnel to understand and accept

Method used

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  • A critically meshing gear pair in unit modulus of a light-weight gear pump
  • A critically meshing gear pair in unit modulus of a light-weight gear pump
  • A critically meshing gear pair in unit modulus of a light-weight gear pump

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Embodiment

[0029] Such as figure 1 As shown, the critical meshing gear pair of a light-weight gear pump of the present invention under the unit modulus includes a pair of driving and driven involute gears with the same tooth shape parameters under the unit modulus, and the meshing position of the tooth apex is The endpoints on the meshing line are the critical points.

[0030] First, from the theoretical displacement formula of the gear pump, we get

[0031]

[0032] In the formula, q e is the theoretical displacement of the pump, V e is double the pitch cylinder volume of the gear pair; V q is the unit displacement volume of the pump; lambda is the shape factor of the gear, which is equal to the ratio of the radius of the tip circle to the pitch circle.

[0033] Known from formula (1), lambda directly determines the unit displacement volume of the pump V q ( lambda ), the weight of the pump is equivalent to lambda maximize.

[0034] Secondly, in figure 1 Among them, ...

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Abstract

The invention relates to a critical meshing gear pair under the unit modulus of a light-weight gear pump, which includes a pair of driving and driven involute gears with the same tooth shape parameters under the unit modulus, and the meshing position of the tooth apex is the theoretical meshing line At the critical point above, the gear pump lightweight existing mixed parallel design method of shape parameters and size parameters is changed to the number of teeth, addendum height coefficient and The shape parameters of the top clearance coefficient and the corresponding shape coefficient are calculated, the upper limit of the modulus determined by the maximum peripheral speed of the addendum that does not cause cavitation and its standardization, determine the single maximum modulus required, and finally determine the gear The serial design method of the actual size of the pair including the tooth width, and the modulus takes the maximum value allowed, which is conducive to improving the strength and stiffness of the gear and reducing the axial leakage accounting for about 85% of the total leakage of the pump. Realize the lightweight design requirements of gear pumps with high quality and high efficiency.

Description

technical field [0001] The invention relates to a gear pair for an external meshing gear pump, in particular to a pump unit modulus gear pair with a critical meshing position. Background technique: [0002] External gear pump (referred to as gear pump) is a power element for pumping working medium. Because of its simple structure and excellent performance, it is widely used. It is also used in water treatment and thermal control systems of spacecraft. A pair of master and slave gears with the same parameters are the core components of the pump, and the determination of the tooth shape parameters directly affects the performance, noise and life of the pump. Among them, the involute tooth profile is the most common application. This pair of pump gear pairs with the same parameters at home and abroad, according to different application occasions, has launched a single (multiple) goal with light weight, flow pulsation, and volumetric efficiency. Lots of (optimized) designs. Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/18F04C15/00
CPCF04C2/18F04C15/00F04C2240/20
Inventor 李玉龙
Owner SICHUAN WUHUAN PETROCHEM EQUIP CO LTD
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