a pump motor

Abstract

The invention relates to the technical field of engineering machinery, and particularly relates to a pump motor. The pump motor provided by the invention comprises a pump motor body, a working condition switching executing device and a working condition control component, wherein the pump motor body comprises a first working port, a second working port and a swash plate; the wording condition switching executing device comprises a first hydraulic control end and a second hydraulic control end; the working condition control component can control to switch the pump motor between a pump working condition and a motor working condition through controlling the pressure of a hydraulic control end of a second driving device; further, in the pump working condition, the working condition control component can control the pressure change of the hydraulic control end of the second driving device according to the change of load pressure; and thus, the pump motor is controlled to realize a pump load-sensitive control function. The pump motor provided by the invention not only can be used as a pump, but also can be used as a motor, has an energy recovery function, moreover, can be used for regulating a flow volume according to the load pressure in the pump working condition, and has the pump load-sensitive control function.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a pump motor. Background technique [0002] In the prior art, many construction machinery are faced with the problem of how to save energy. For example, wheeled mobile construction machinery such as truck cranes and garbage trucks have a large number of products, high fuel consumption, and poor emissions. All of these lead to urgent solutions to energy-saving problems. [0003] Recycling energy by designing appropriate devices is an effective technical means to solve the above energy-saving problems. [0004] Swash plate axial piston pumps and swash plate axial piston motors are commonly used fluid machines in construction machinery. Because of their advantages of small size, light weight, high power density, and easy control, they are widely used in various in a hydraulic system. [0005] Figure 1-2 The working principle of the swash plate axial piston pump is ...

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Problems solved by technology

[0007] However, in the prior art, most swash plate axial piston pumps or motors only have a corresponding single function, that is, the pump can only realize the function of the pump, and the motor can only realize the function of the motor, and cannot be used in pump working conditions and motor working conditions. The energy recovery function cannot be realized; or although some hydraulic components that can switch between the pump working condition and the motor working condition have appeared, the structures of these existing hydraulic components are generally more complicated and the cost is relatively high. High, and its control effect is not ideal, for example, the pump load sensitive control function cannot be realized, which leads to the poor performance of existing products of this type, and the application is greatly restricted

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