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Electrohydraulic proportion variable axial plunger pump

A technology of axial piston pump and electro-hydraulic ratio, which is applied in the direction of liquid variable capacity machinery, pumps, multi-cylinder pumps, etc., can solve the problems of unreliable repeatability and difficulty in meeting actual use requirements, and achieve oil cleanliness The effect of reduced requirements, stable stiffness, and sensitive movement

Inactive Publication Date: 2012-04-25
宁波恒力液压股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the structure of the above-mentioned patent is simple, it is limited by its own characteristics, and the repetition accuracy is unreliable, which is difficult to meet the actual use requirements

Method used

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  • Electrohydraulic proportion variable axial plunger pump
  • Electrohydraulic proportion variable axial plunger pump
  • Electrohydraulic proportion variable axial plunger pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Example: Reference figure 1 with figure 2 As shown, the electro-hydraulic proportional variable axial piston pump in this embodiment includes a plunger pump body 100 and a variable mechanism 101 disposed on one side of the plunger pump body 100 .

[0037] The plunger pump main body 100 further includes a pump body 21 , a pump casing 17 , a plunger shoe 30 , a transmission shaft 24 , an oil distribution plate 20 , a cylinder assembly 19 and a plunger 31 . The variable mechanism 101 includes a variable housing 4, a variable piston 3, a variable head 5, a servo valve sleeve 6, a servo valve core 7, a baffle plate 8, a first flange 9, a control flange 16, a control piston 14, a pull rod 11, Spring seat 12, fixed nut 13, positioning spring 10, proportional pressure reducing valve 15, second flange 1 and limit piston 2.

[0038] The pump casing 17 and the pump body 21 are connected with hexagon socket head cap screws, the pump casing 17 is arranged between the variable cas...

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Abstract

An electro-hydraulic proportional variable axial plunger pump comprises a plunger pump body (100) and a variable mechanism (101) arranged at one side of the variable mechanism (101). The variable mechanism (101) comprises a variable shell (4), a variable piston (3), a variable head (5), a servo-valve housing (6), a servo-valve spool (7), a first flange (9), a positioning spring (10), a control flange (16), a proportional relief valve (15), etc. Compared with the prior art, the inventive axial plunger pump has the advantages of high entire operation reliability, high repetition accuracy, stepless variable implementation, lower oil cleanliness requirement, concise control mechanism, flexible action, relatively lower manufacturing cost, and high product cost performance.

Description

technical field [0001] The invention relates to a swash plate type axial plunger pump, in particular to an electro-hydraulic proportional variable axial plunger pump. Background technique [0002] Since the 1970s, in order to save energy, the foreign hydraulic transmission control system has changed from the traditional valve-controlled hydraulic system to the hydraulic system controlled by the pump displacement. It has played an important role in the development of the national economy. In particular, it is pointed out that the electro-hydraulic proportional axial piston pump has the most extensive application fields due to its advantages of simple control, sensitive action, high repeatability, and the ability to realize stepless variables. [0003] However, some electro-hydraulic proportional axial piston pumps currently used are adjusted by configuring a proportional servo valve, a displacement sensor, and a programmable controller to form a closed loop, but their expens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B1/12F04B1/30
Inventor 吴平
Owner 宁波恒力液压股份有限公司