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Big pressure angle negative profile shifted gear for hydraulic gear pump

A hydraulic gear pump and pressure angle technology, applied in the field of gears, can solve the problems of noise pollution, inability to use, small space, etc., and achieve the effects of long life, low noise, and light weight

Inactive Publication Date: 2008-01-09
XUZHOU KEYUAN HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical center distance of the two gears meshing is A=m×z. In order to achieve a larger displacement, increasing the modulus m and the number of teeth z will increase the volume of the gear pump. The installation of the gear pump requires a large space, and the space is small and cannot be used.
[0009] The currently used gear pumps generally have the disadvantage of excessive instantaneous flow pulsation, which reduces the stability and uniformity of the components in the hydraulic system, and even produces pressure pulses, which cause the entire system to vibrate and generate strong noise pollution.

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  • Big pressure angle negative profile shifted gear for hydraulic gear pump

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Embodiment Construction

[0016] 1. Gear parameters and calculation case:

[0017] 1. Tooth profile parameters

[0018] (1) Number of teeth Z=10

[0019] (2) Modulus m=5.75

[0020] (3) Tooth profile pressure angle α=30°

[0021] 2. Design calculation formula

[0022] (1) Theoretical center distance a=mz=57.5

[0023] (2) Actual central data a'=55

[0024] (3) Pitch circle diameter d=mz=57.5

[0025] (4) Base circle diameter db=mzcosα=49.8

[0026] (5) The meshing angle α' is determined by the formula cosα'=a / a'*cosα

[0027] Get α'=arcc(a / a'*cosα)=arccos57.5 / 55*cos30°=25.12°

[0028] (6) Variation coefficient x=z(ivnα'-ivnα) / 2tgα=-0.202

[0029] (7) Separation coefficient of center distance y=(a'-a) / m=(55-57.5) / 5.75=-0.435

[0030] (8) Variation coefficient of addendum height Δy=(x1+x2)-y=-0.404+0.435=0.031

[0031] (9) Addendum height ha=(ha*+x-Δy)m=(1-0.202-0.031)*5.75=4.41

[0032] (10) Dedendum height hf=(ha*+cn*-x)m, take cn*=0.17

[0033] hf=(1+0.17+0.202)×5.75=...

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Abstract

This invention discloses involute cylinder gear used in hydraulic gear pump, whose tooth shape is negative addendum modification 30 degree pressure angle. Said invention has small volume, light, long service life, no undercut and low noise etc advantages.

Description

technical field [0001] The invention relates to a gear, in particular to a large pressure angle negative displacement toothed gear in a hydraulic gear pump. Background technique [0002] Currently widely used hydraulic gear pumps, most of the gears are ordinary standard involute cylindrical gears. In the design of hydraulic gear pumps, the displacement calculation generally adopts the formula q=2πzm 2 B*10 -3 Carry out displacement calculations to determine the parameters of the gear, where [0003] q-pump displacement unit ml / r [0004] Number of teeth of Z-gear [0005] m-the modulus of the gear in mm [0006] B-gear width in cm [0007] It can be seen from the above formula that the first square ratio of the displacement q to the number of teeth z is proportional to the square of the modulus and proportional to the gear width. When the displacement needs to be increased, if the number of teeth is increased, the volume of the gear pump will increase. If the width of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/18
Inventor 韩永进徐云涛刘洪森林国英袁世维王小兵
Owner XUZHOU KEYUAN HYDRAULIC