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Volume-variable bi-directional rotary pump and hydraulic loop using the pump

A two-way rotation and capacity technology, applied in the direction of liquid variable capacity machinery, pumps, pump control, etc., can solve the problems of large load torque, low load torque, and large-scale efficiency of the overall device, so as to reduce load torque and improve The effect of work efficiency

Active Publication Date: 2007-05-30
YUKEN KOGYO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a pump with a large displacement is used, the load torque also increases during pressure control, so it is also necessary to select a motor with a large capacity, which increases the overall size of the device and reduces efficiency.

Method used

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  • Volume-variable bi-directional rotary pump and hydraulic loop using the pump
  • Volume-variable bi-directional rotary pump and hydraulic loop using the pump
  • Volume-variable bi-directional rotary pump and hydraulic loop using the pump

Examples

Experimental program
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Effect test

Embodiment

[0030] As an embodiment of the present invention, Fig. 2 shows a hydraulic circuit using a bidirectional rotary pump with a swash plate type variable capacity device. Fig. 2 (a) is a hydraulic circuit diagram showing the connection state of the second circuit for displacing the capacity variable mechanism to the small capacity side, and (b) is a hydraulic circuit diagram showing the formation of the second circuit for displacing the capacity variable mechanism to the large capacity side The hydraulic circuit diagram of the state of the primary circuit connection.

[0031] The hydraulic circuit of this embodiment represents a hydraulic control circuit formed by connecting two discharge ports of a variable capacity bidirectional rotary pump having the same structure as that shown in FIG. 1 in series with a hydraulic cylinder. That is, in the present variable capacity bidirectional rotary pump, the capacity variable mechanism 17 is provided on the bidirectional rotary pump mechan...

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PUM

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Abstract

The invention provides a bi-directional rotary pump, which can form large flow when controlling flow, and can reduce load torque exerting on the electric engine when controlling pressure, making the electric engine miniaturization and with higher efficiency than the existing bi-directional rotary pump. The volume-variable bi-directional rotary pump includes a bi-directional rotary pump mechanism, a volume-variable mechanism for carrying out mechanical modification based on the increase and decrease of the control pressure acting on the press part, which causes the discharge volume for rotating per unit of the pump mechanism to change; a change-over valve, forming the first loop connection for reducing said control pressure, connecting the press part with low press side loop, when making the volume-variable mechanism modify to the large volume, at the same time the second loop connection is formed for guiding the discharge pressure of said pump mechanism itself as control pressure, when making the volume-variable mechanism modify to the small volume.

Description

technical field [0001] The present invention relates to a variable-capacity bidirectional rotary pump that supplies liquid such as hydraulic oil from two ports to corresponding working parts. Background technique [0002] The two-way rotary pump has two discharge ports, and pressurized oil is discharged from one of the discharge ports according to the forward and reverse rotation directions. For example, only connecting the two discharge flow paths shown in the hydraulic circuit in Figure 4 with the hydraulic cylinder can easily constitute a hydraulic pressure pump. Control System. In such a bidirectional rotary pump, the discharge direction is changed by switching the direction of forward and reverse rotation, whereby the direction of hydraulic fluid can be controlled and the moving direction of the hydraulic cylinder can be changed. Furthermore, conditions such as required flow rate and pressure can be obtained by controlling the rotational speed (for example, refer to Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B1/12F04B49/00F15B11/00F15B11/02
Inventor 平出博一寺沢达士
Owner YUKEN KOGYO
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