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Pressure pulsation reduction device and pulsation damping member for hydraulic pressure system

A pressure pulsation and hydraulic system technology, applied in the direction of brake components, engine components, brakes, etc., can solve the problems of adverse effects of external environment, output oil pressure pulsation, pressure pulsation, etc., to avoid product unit price increase, reduce stress, The effect of excellent durability

Active Publication Date: 2018-12-21
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in this hydraulic brake system, a hydraulic pump that generates hydraulic pressure is used, and since the hydraulic pump periodically sucks in and discharges brake fluid, pressure pulsation occurs in its output hydraulic pressure.
In addition, pressure pulsation may also occur due to various reasons
And, this pressure pulsation adversely affects the external environment

Method used

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  • Pressure pulsation reduction device and pulsation damping member for hydraulic pressure system
  • Pressure pulsation reduction device and pulsation damping member for hydraulic pressure system
  • Pressure pulsation reduction device and pulsation damping member for hydraulic pressure system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Based on such a background, the present embodiment proposes a pressure pulsation reducing device configured as follows.

[0045] That is, in the present embodiment, the first metal diaphragm constituting the pulsation damping member has a first recess recessed toward the inner space side; and the second metal diaphragm constituting the pulsation damping member has a second recess. 2. A concave portion that is concave toward the inner space side, has a curvature greater than that of the first concave portion of the first metal diaphragm, and is capable of abutting against the first concave portion of the first metal diaphragm.

[0046] In addition, the present embodiment is configured as follows: On one metal diaphragm constituting the pulsation attenuating member, a plurality of recesses that are recessed toward the inner space of the pulsation attenuating member are formed, and on the other metal film constituting the pulsation attenuating member On the sheet, a plural...

Embodiment 2

[0089] Next, a second embodiment of the present invention will be described. Although it is basically the same as the first embodiment, the difference lies in that the configuration of the edge portion on the outer peripheral side is turned back toward one surface.

[0090] Below, refer to Figure 7 and Figure 8 The configuration of the pulsation damping member of the second embodiment will be described. Figure 7 represents the cross-section of the pulsation damping member 17, Figure 8 The middle indicates the pulsation damping member viewed obliquely from the lower side. In the second embodiment, the basic structures of the first concave portion 25A and the second concave portion 27A of the first metal diaphragm 17A, and the first concave portion 25B and the second concave portion 27B of the second metal diaphragm 17B are the same as those of the first embodiment. In the same configuration, the configurations of the edge portion 22A- 1 of the first metal diaphragm 17A a...

Embodiment 3

[0096]Next, a third embodiment of the present invention will be described, which is basically the same as the first embodiment except that the first protrusion is formed on the second metal diaphragm.

[0097] Below, refer to Figure 9 and Figure 10 The structure of the pulsation damping member of the third embodiment will be described. Figure 9 represents the cross-section of the pulsation damping member 17, Figure 10 The pulsation damping member viewed obliquely from above is shown. In the third embodiment, the basic structures of the first recessed portion 25A and the second recessed portion 27A of the first metal diaphragm 17A, and the first recessed portion 25B and the second recessed portion 27B of the second metal diaphragm 17B are the same as those of the first embodiment. In the same structure, the shape of the first metal diaphragm 17A from the edge portion 22A to the first recess 25A and the shape of the second metal diaphragm 17B from the edge portion 22B to ...

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PUM

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Abstract

The purpose of the invention is to provide a novel pressure pulsation reduction device for a hydraulic system that reduces stress occurring in a metal diaphragm and that has excellent durability. A plurality of concentric circular recesses (25A, 27A) protruding toward a space inside a pulsation damping member are formed in one metal diaphragm (17A), a plurality of concentric circular recesses (25B, 27B) protruding toward the space inside the pulsation damping member are similarly formed in another metal diaphragm (17B), and when a prescribed amount of pressure acts on both metal diaphragms, atleast one recess (25A, 27A) of the one metal diaphragm and at least one recess (25B, 27B) of the other metal diaphragm come into contact with each other.

Description

technical field [0001] The present invention relates to a pressure pulsation reduction device and a pulsation attenuation member for attenuating the pressure pulsation of a fluid, in particular to a pressure pulsation reduction device and a pulsation attenuation member used in a hydraulic system. Background technique [0002] Hydraulic systems using working oil as a medium are widely used in automobiles and industrial machines. For example, in automobiles, a hydraulic brake system that operates a brake mechanism using hydraulic pressure from a hydraulic pump is widely known. Furthermore, a hydraulic system of a transmission, a hydraulic system of a high-pressure fuel injection pump, and the like are widely known. In addition, in the following description, a hydraulic brake system is exemplified and described, but the present invention is not limited thereto, and can be applied to pressure pulsation reducing devices of various hydraulic systems. [0003] However, in this hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T17/00F16J3/02F16J15/52
CPCB60T8/4068B60T17/221F16D65/0006F16D2125/12F16J3/02F16L55/041F16L55/05B60T8/4031B60T17/00
Inventor 解龙伊藤贵广濑户信治横山笃仓垣智小泉俊裕
Owner HITACHI ASTEMO LTD