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hydraulic buffer

A hydraulic shock absorber and hydraulic cylinder technology, applied in the field of hydraulic shock absorbers, can solve the problems of rapid changes in the area of ​​the flow path, the tendency of the valve spring to contract obliquely, and the low natural vibration number of the spring to achieve the effect of reducing vibration

Active Publication Date: 2016-06-08
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in railway vehicles, since the weight of the vehicle body has been reduced in recent years, the vibration is easily transmitted to the vehicle body. Therefore, even in the hydraulic shock absorber, there is a problem that abnormal noise caused by the vibration when the safety valve is opened and closed is transmitted to the vehicle body.
The reasons for this abnormal noise are as follows: (1) Because it is used under the safety feature, the flow of working oil when the valve is opened is a jet flow; (2) Due to the use of a valve with a large set load and a low spring coefficient Spring, therefore, the natural vibration number of the spring is low; (3) The valve spring tends to contract obliquely, thereby acting an unbalanced load on the valve body; (4) Since the flow path area changes rapidly when the valve is opened, it is easy to respond excessively

Method used

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no. 1 approach ）

[0022] A first embodiment of the present invention will be described with reference to the drawings. Here, the single-flow type hydraulic shock absorber 1 arranged vertically will be described. It should be noted that the upward direction (upper side) and downward direction (lower side) in the following descriptions are the same as figure 1 The upward direction (upper side) and the downward direction (lower side) are the same.

[0023] Such as figure 1 As shown, the hydraulic shock absorber 1 is a multiple cylinder structure in which an outer cylinder 3 is provided outside a hydraulic cylinder 2 , and an annular oil storage chamber 4 is formed between the hydraulic cylinder 2 and the outer cylinder 3 . Openings at both ends of the hydraulic cylinder 2 and the outer cylinder 3 are closed by the upper closing member 5 and the lower closing member 6 . In addition, the lower closing member 6 can be divided into a first cover member 7 for closing the opening at the lower end of ...

no. 2 approach ）

[0040] A second embodiment of the present invention will be described with reference to the drawings. In addition, the same name and code|symbol are attached|subjected to the same or equivalent component as 1st Embodiment, and detailed description is abbreviate|omitted.

[0041] In the first embodiment described above, the safety valve 14 communicates the buffer chamber 36 and the valve body chamber 20 through the passage 37 passing through the first shaft portion 31 of the valve body 19 in the radial direction. In contrast, such as Figure 5 and Figure 6 As shown, in the second embodiment, the safety valve 14A communicates the buffer chamber 36 and the valve body chamber 20 through a pair of grooves 41 formed on the inner peripheral surface of the large-diameter portion 35A of the throttle passage 35 .

[0042] exist Figure 5 When the shown safety valve 14A is closed, the buffer chamber 36 and the valve body chamber 20 are communicated by a pair of grooves 41 . On the o...

no. 3 approach ）

[0045] A third embodiment of the present invention will be described with reference to the drawings. In addition, the same name and code|symbol are attached|subjected to the same or equivalent component as 1st Embodiment, and detailed description is abbreviate|omitted.

[0046] In the first embodiment described above, the safety valve 14 communicates the buffer chamber 36 and the valve body chamber 20 through the passage 37 passing through the first shaft portion 31 of the valve body 19 in the radial direction. In contrast, such as Figure 8 As shown, in the third embodiment, the safety valve 14B utilizes the annular passage 42 centered on the axis of the valve body 19 formed between the throttle passage 35 of the valve body 19 and the shaft portion 28 of the screw member 22 to buffer Chamber 36 communicates with valve body chamber 20 .

[0047] The passage 42 is formed by opposing a tapered hole 42A formed on the valve body 19 side and a tapered shaft 42B formed on the scre...

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Abstract

A hydraulic buffer that reduces vibration when the safety valve opens and closes. The buffer chamber (36) is formed in the safety valve (14) by slidably fitting the shaft portion (28) of the spiral member (22) into the throttle passage (35) of the valve body (19). The buffer chamber (36) constitutes a buffer device that functions to delay the response of the safety valve (14). Therefore, the throttling characteristics are not impaired and vibration (abnormal noise) generated from the safety valve (14) can be effectively suppressed. .

Description

technical field [0001] The invention relates to a hydraulic buffer. Background technique [0002] As a hydraulic shock absorber incorporated in a suspension device of a railway vehicle, a hydraulic shock absorber provided with a safety valve in a flow path in which operating oil flows from an oil chamber in a hydraulic cylinder to an oil storage chamber by expansion and contraction of a piston rod is known. (For example, refer to Patent Document 1). [0003] Patent Document 1: (Japanese) Unexamined Patent Publication No. 2003-74614 [0004] However, in railway vehicles, since the weight of the vehicle body has been reduced in recent years, the vibration is easily transmitted to the vehicle body. Therefore, even in the hydraulic shock absorber, there is a problem that abnormal noise caused by the vibration when the safety valve is opened and closed is transmitted to the vehicle body. The reasons for this abnormal noise are as follows: (1) Because it is used under the safety...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F9/34
Inventor 柴原和晶
Owner HITACHI ASTEMO LTD