Skid shoe-free swash plate-free axial short piston pump

Abstract

The invention relates to a ram pump, in particular to a ram pump without sliding shoes and swash plates. An input shaft (1) is provided with a front cavity body (4), a front baffle (3), a rear baffle (15) and a rear cavity body (8), wherein, the front cavity body (4) and the rear cavity body (8) are respectively connected with the input shaft (1) via a bearing; a thrust bearing is arranged between the front cavity body (4) and the front baffle (3); the front baffle (3) and the rear baffle (15) are respectively fixedly connected with the input shaft (1); a port plate (12) is arranged between the rear baffle (15) and the rear cavity body (8); a support ring (7) is arranged inside a shell body (5); the support ring (7) contacts an adjusting screw (6) and a spring (16) arranged on the upper end and the lower end of the shell body (5); a cylinder (1) is arranged on the inner side of the support ring (7), and between the front baffle (3) and the rear baffle (15) via a needle bearing (9); the cylinder (10) is provided with 2 to 7 cylinder holes uniformly distributed around the center of the cylinder (10); a cylinder unit which is fixed on the front baffle (3) and the rear baffle (15) is arranged in the cylinder holes, and the rear baffle (15) is provided with a kidney-shaped hole. The pump has the advantages of no sliding shoes, no swash plates and little friction pair, which is beneficial to the control of an oil pump and to the increase of pressure; furthermore, as the oil pump can bidirectionally output pressure oil, the hydraulic system is simplified.

Description

technical field [0001] The invention relates to a plunger pump, in particular to a plunger pump without a sliding shoe and without a swash plate. technical background [0002] The hydraulic pump is the power source of the hydraulic system, and the quality of the oil pump determines the performance of the hydraulic system. At present, the oil pumps used in hydraulic systems include gear pumps, vane pumps, and plunger pumps. Gear pumps are widely used because of their simple structure and low price. However, gear pumps also have their weaknesses, such as: relatively low volumetric efficiency, and cannot be variable. , so its application is limited; the vane pump also has weaknesses such as relatively low output pressure; although the volumetric efficiency of the plunger pump is high and variable, but its cost is high, there are many friction pairs, and the control required for its variable The force is relatively large, so its application is also limited. Although the contro...

AI Technical Summary

Problems solved by technology

At present, the oil pumps used in hydraulic systems include gear pumps, vane pumps, and plunger pumps. Gear pumps are widely used because of their simple structure and low price. However, gear pumps also have their weaknesses, such as: relatively low volumetric efficiency, and cannot be variable. , so its application is limited; the vane pump also has weaknesses such as relatively low output pressure; although the volumetric efficiency of the plunger pump is high and variable, but its cost is high, there are many friction pairs, and the control required for its variable The force is large, so it also limits its application

Although the control force of the plunger pump can be solved by taking some measures, its cost is unacceptable for some small and medium-sized enterprises

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