Servoless motor, hydraulic piston unit and control method thereof

A hydraulic piston and piston technology, applied in hydraulic axial piston unit and bending shaft structure type, hydraulic radial piston unit or vane pump and motor field, can solve the inoperability of hydraulic piston unit, consumption of structural space, cost increase, etc. question

Active Publication Date: 2020-02-11
丹佛斯动力系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such servo units form a separate component group, especially in two-position hydraulic piston units, which leads to increased costs and consumes construction space
In addition, such servo units are subject to wear or other possible failures, which can lead to inoperability of the entire hydraulic piston unit

Method used

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  • Servoless motor, hydraulic piston unit and control method thereof
  • Servoless motor, hydraulic piston unit and control method thereof
  • Servoless motor, hydraulic piston unit and control method thereof

Examples

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Embodiment Construction

[0025] exist Figures 1 to 5 In , the invention is disclosed schematically by means of a simplified hydraulic piston unit, exemplarily a hydraulic axial piston unit of swash plate structure. The illustrated embodiments are only for reasons of simplification, which only illustrate the invention in a simplified manner and do not limit the scope of the inventive concept. On the contrary, as mentioned above, the invention is also applicable to hydraulic axial piston units of the bent axis or rolling plate construction type, as well as to radial piston units and vane units. In addition, in the drawings, the same reference numerals denote the same features of the hydraulic piston unit of the present application. Therefore, although some descriptions may refer only to certain figures and reference numerals, it should be understood that such descriptions may equally apply to the same reference numerals in other figures.

[0026] figure 1 The hydraulic axial piston unit 1 shown in i...

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PUM

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Abstract

The invention provides a servoless motor, a hydraulic piston unit and a control method thereof. The hydraulic piston unit includes a rotational group for driving or being driven by a driving shaft, and has a tiltable displacement element for adjusting the displacement volume of the rotational group between a minimum or a maximum displacement, wherein, on t valve segment between a kidney-shaped inlet port and a kidney-shaped outlet port at respective dead end positions of reciprocally moveable working pistons first and second control ports are located in fluid connection with cylinder bores inthe cylinder block, for controlling the position of the displacement element. The hydraulic piston unit further includes a control valve with a shiftable control valve spool fluidly connected via a high pressure port to a high pressure side of the hydraulic piston unit. The control valve spool is configured to conduct hydraulic fluid from the high pressure side to one of the first or the second control port.

Description

technical field [0001] The invention relates to a hydraulic piston unit with a displacement element for adjusting the displacement volume of the hydraulic unit. The invention relates in particular to a hydraulic axial piston unit of the swash plate and to a bent shaft type of construction. However, the invention is also applicable to hydraulic radial piston units or vane pumps and motors. In the sense of the present invention, the term hydraulic piston unit covers hydraulic piston pumps as well as hydraulic piston motors. In a particular embodiment, the invention relates to a two-position hydraulic axial piston unit, wherein a displacement element can be positioned between two end positions for adjusting the displacement volume of the hydraulic axial piston unit to a maximum or minimum value . Although the invention is described with the example of an axial piston unit specifically having an axial piston unit of the swashplate construction type, the given example may be tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/14F15B15/20
CPCF15B15/14F15B15/20F03C1/0636F04B1/20F04B1/324F03C1/0686F03C1/0655F04B49/002F04B1/2042F04B49/22F03C1/005F04B1/122F03C1/08
Inventor 史蒂文·李格斯蒂芬·弗兰茨杰弗里·C·汉塞尔
Owner 丹佛斯动力系统有限公司
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