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Cycloidal pin gear hydraulic pump

A cycloidal gear and hydraulic pump technology, which is applied in the field of hydraulic pumps, can solve problems such as high rotor precision requirements, difficult processing and manufacturing, and large fluctuations in working pressure, so as to eliminate the influence of oil pressure stability, simple structure, and easy drainage. The effect of volume increase

Inactive Publication Date: 2007-12-26
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the meshing rotation of the inner and outer rotors (2, 14), the volume of each closed space changes, and liquid is sucked and discharged; due to the small number of teeth of the inner and outer rotors (2, 14), the working pressure fluctuates greatly under high pressure and low speed conditions. It is mostly used in medium and low pressure occasions, and the precision of the rotor is high, and the outer rotor (14) is a ring gear with arc teeth, which is difficult to manufacture

Method used

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  • Cycloidal pin gear hydraulic pump
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A needle-toothed cycloid gear hydraulic pump, the structure of which is shown in Figure 1. The hydraulic pump is mainly composed of a transmission shaft (1), an inner rotor (2), a needle tooth (3), a hypocycloid wheel (4), a front end cover (5), a pump body (6), a rear end cover (7), Liquid inlet (8), liquid outlet (10), flow distribution shaft (9) and other components. The transmission shaft (1) is an eccentric shaft, which drives the inner rotor (2) to rotate; the inner rotor (2) is a short epicycloid wheel or a circular wheel; the pin teeth (3) are eccentric pin teeth (3), and rotate eccentrically, The position of the rotation axis is fixed, and the rotation axis of the needle teeth (3) is distributed on a cylindrical surface with the rotation axis of the hypocycloid wheel (4) as the axis; the hypocycloid wheel (4) is a short hypocycloid ring gear, and the inner rotor (2) Set eccentrically with respect to the hypocycloid wheel (4); the inner rotor (2), the needle te...

Embodiment 2

[0037]A needle cycloid gear hydraulic pump, the structure of which is shown in Figure 3. The hydraulic pump is mainly composed of transmission shaft (1), inner rotor (2), needle teeth (3), hypocycloid wheel (4), front end cover, pump body (6), rear end cover (7), liquid inlet (8), liquid outlet (10), distribution plate (9) and other components. The transmission shaft (1) is an eccentric shaft, which drives the inner rotor (2) to rotate; the inner rotor (2) is a circular wheel or a short epicycloidal wheel; the pin teeth (3) are eccentric pin teeth (3), and rotate eccentrically, The position of the rotation axis is fixed, and the rotation axis of the needle teeth (3) is distributed on a cylindrical surface with the rotation axis of the hypocycloid wheel (4) as the axis; the hypocycloid wheel (4) is a short hypocycloid ring gear, and the inner rotor (2) Set eccentrically with respect to the hypocycloid wheel (4); the inner rotor (2), the needle teeth (3), and the hypocycloid wh...

Embodiment 3

[0039] A needle-toothed cycloid gear hydraulic pump, the structure of which is shown in Figure 4. The hydraulic pump is mainly composed of transmission shaft (1), inner rotor (2), needle teeth (3), hypocycloid wheel (4), front end cover, pump body (6), rear end cover (7), liquid inlet (8), liquid outlet (10), flow distribution shaft (9) and other components. The transmission shaft (1) is fixedly connected with the hypocycloid wheel (4); the inner rotor (2) is a short epicycloid wheel or a disc; the pin teeth (3) are eccentric pin teeth (3), and rotate eccentrically, The axial position is fixed, and the rotation axis of the needle teeth (3) is distributed on the cylindrical surface with the rotation axis of the hypocycloid wheel (4) as the axis; the hypocycloid wheel (4) is a short hypocycloid ring gear, and the inner rotor ( 2) It is arranged eccentrically with respect to the hypocycloid wheel (4); the inner rotor (2), the needle teeth (3), and the hypocycloid wheel (4) form ...

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Abstract

The pin gear-cycloid gear hydraulic pump has driving shaft, pump core and valve inside the pump body. The pump core is rotated with the driving shaft, and has drawing cavity connected to conveying pipeline via valve. The pump core is one pin gear-cycloid gear mechanism comprising inner rotor, pin gear, and inner cycloid gear; the inner rotor is set eccentrically relative to the inner cycloid gear and meshed with the pin gear and the inner cycloid gear successively. The inner rotor and the inner cycloid gear and two adjacent pin gears constitute one drawing cavity. The pin gear is eccentric and has fixed rotating shaft and rotating axis distributed on one cylindrical surface with the rotating shaft of the inner cycloid gear as the axis. The hydraulic pump of the present invention has the advantages of several drawing cavities, no fluctuation in flow rate, less liquid pressure impact, less noise, less energy loss, less wear, long service life, etc.

Description

Technical field: [0001] The invention relates to a hydraulic pump. Background technique: [0002] At present, commonly used hydraulic oil pumps include gear pumps, vane pumps, plunger pumps, and cycloid rotor pumps. Each of these pumps has its own disadvantages. [0003] Gear pumps have problems such as "trapped oil", unbalanced radial hydraulic pressure, and large flow pulsation. "Trapped oil" causes a large additional load on the gears and bearings, the bearing life is short, and the oil pump efficiency is low. In addition, "trapped oil" will also increase the oil temperature, which will easily generate air bubbles, and the bursting of air bubbles will cause loud noises. The radial hydraulic pressure is unbalanced, causing the gear shaft to be bent, the radial clearance of the gear in the liquid suction chamber becomes smaller, and the gear and the inner cavity of the pump body are rubbed or stuck, so that the oil pump cannot work normally. After the hydraulic oil is s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/107
Inventor 林菁
Owner SHANGHAI NORMAL UNIVERSITY
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