CN109737175B

CN109737175B - Piston assembly for double-circulation anti-meandering oil pressure shock absorber of high-speed motor train

Info

Publication number: CN109737175B
Application number: CN201811638055.XA
Authority: CN
Inventors: 张红伟; 吴旭; 吴彤
Original assignee: Zhuhai Yecheng Rail Transit Equipment Technology Co ltd
Current assignee: Zhuhai Yecheng Rail Transit Equipment Technology Co ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2024-03-29
Anticipated expiration: 2038-12-29
Also published as: CN109737175A

Abstract

The invention relates to a piston assembly for a dual-cycle anti-hunting oil pressure shock absorber of a high-speed motor train, comprising: the piston and core valve, be equipped with the passageway that fluid passed through the piston circulation on the piston, be provided with the core valve in the passageway, be provided with on the core valve with the spacing guide pillar of core valve integral type connection, the tip and the locating pin cooperation of spacing guide pillar are connected, the locating pin with the piston riveting is fixed. The invention has less change to the whole structure of the piston assembly of the shock absorber, increases less production cost, can effectively solve the problem of leakage in the original piston assembly, increases the stability of the piston valve system during operation, meets the requirement of the anti-snake vibration absorber on the piston assembly, and ensures the stability of the damping performance of the anti-snake vibration absorber.

Description

Piston assembly for double-circulation anti-meandering oil pressure shock absorber of high-speed motor train

Technical Field

The invention relates to the field of high-speed motor train hydraulic elements, in particular to a piston assembly for a high-speed motor train shock absorber.

Background

The oil pressure shock absorber is a key part on the railway vehicle, particularly an anti-hunting shock absorber, has extremely high technical content, and the quality of the working performance of the oil pressure shock absorber is directly related to the riding comfort and the safety of the railway vehicle. The installation of anti-hunting hydraulic dampers on trains has become a trend and the rail head office specifies that anti-hunting dampers must be installed on trains having speeds above 160 Km/h. In recent years, along with the rapid development of high-speed rail technology in China, the speed of rail vehicles is continuously improved, the technical requirements for anti-snake vibration dampers are also higher and higher, and the research on anti-snake vibration dampers by various scientific research institutions is also continuously deepened.

In the prior art, the influence on the anti-snake damping performance is uncontrolled, wherein one main reason is internal leakage, and when the piston structure of the prior anti-snake shock absorber is observed, only two piston rings are sealed, and the piston rings are provided with inclined grooves. The sealing structure can meet the use requirement of a common shock absorber (one-vertical, two-horizontal and two-vertical), but when the structure is used in the anti-snake shock absorber, the pressure generated in the pressure cylinder is higher because the damping coefficient of the anti-snake shock absorber is larger. Therefore, how to reduce or eliminate the internal leakage of the anti-hunting damper is always a problem to be solved by the damper manufacturers.

In addition, the damping coefficient of the anti-hunting shock absorber is larger, and the impact on the valve system is larger, so that the stability requirement on the valve system is higher.

Disclosure of Invention

In order to solve the above problems, the present invention provides a piston assembly for a dual cycle anti-hunting oil pressure damper for a high speed motor train, comprising: the piston and core valve, be equipped with the passageway that fluid passed through the piston circulation on the piston, be provided with the core valve in the passageway, be provided with on the core valve with the spacing guide pillar of core valve integral type connection, the tip and the locating pin cooperation of spacing guide pillar are connected, the locating pin with the piston riveting is fixed.

Further, a plurality of groups of piston rings are arranged between the piston and the inner cylinder of the shock absorber, and a Gellan ring is arranged between the adjacent piston rings.

Further, the piston ring and the Gelai ring are both fixed in a groove at the outer side of the piston.

Further, a core valve spring is arranged on the core valve.

Further, an adjusting screw is also arranged near the core valve spring.

One advantage of the present invention is that: the invention has less change to the whole structure of the piston assembly of the shock absorber, increases less production cost, can effectively solve the problem of leakage in the original piston assembly, increases the stability of the piston valve system during operation, meets the requirement of the anti-snake vibration absorber on the piston assembly, and ensures the stability of the damping performance of the anti-snake vibration absorber.

Drawings

FIG. 1 is a schematic illustration of an improved front piston assembly installation.

Fig. 2 is a schematic diagram of an improved front core valve structure.

FIG. 3 is a schematic view of the piston assembly mounting structure of the present invention after modification.

FIG. 4 is a schematic illustration of the improved spool valve structure of the present invention.

Fig. 5 is a schematic structural view of a newly added locating pin according to the present invention.

1-a piston; 2-piston rings; 3-gurley; 4-adjusting the screw; a 5-spool valve; 6-core valve spring; 7-locating pins.

Description of the embodiments

A piston assembly for a dual cycle anti-hunting hydraulic shock absorber for a high speed motor vehicle according to the present invention will be described in further detail with reference to the accompanying drawings.

The schematic of the installation of the improved front piston assembly shown in fig. 1 and the schematic of the improved front core valve shown in fig. 2 are precisely because of the leakage problem in the shock absorber existing in the prior art, and only two piston rings 2 are provided for sealing between the cylinder and the piston 1 in the shock absorber. Obviously, for the anti-hunting shock absorber, because the damping coefficient is larger, the pressure generated in the pressure cylinder is higher, the impact on the valve system is larger, and therefore, the requirements on the tightness of the piston assembly and the stability of the valve system are higher. Therefore, under the condition of the original function of the piston assembly, the invention reduces or even eliminates the change of the damping performance of the shock absorber due to the internal leakage between the piston assembly and the pressure cylinder by changing and optimizing the structure of the piston assembly; and the stability of the valve system is improved by changing the structure of the core valve and adding the positioning pin 7 of the core valve.

The improved piston assembly mounting structure of the present invention as shown in fig. 3 is schematically illustrated, and comprises: the piston 1 and core valve 5, be equipped with the passageway that fluid passed through piston 1 on the piston 1, be provided with core valve 5 in the passageway, be provided with on the core valve 5 with the spacing guide pillar that core valve 5 is connected in an organic whole, the tip and the locating pin 7 cooperation of spacing guide pillar are connected, locating pin 7 with piston 1 riveting is fixed.

According to the embodiment of the invention, the piston assembly is applied to the inside of the anti-snake oil pressure shock absorber, and is matched with a piston rod and a pressure cylinder to work together, and a groove is formed on the outer side of the piston 1 to increase the Gelai ring 3.

The improved core valve structure of the invention shown in fig. 4 is schematically shown, the structure of the core valve 5 is changed, a limit guide post is added on the basis of the original core valve 5, and a positioning pin 7 matched with the guide post is fixed on the piston 1. The structure of the newly added locating pin of the present invention is shown in fig. 5.

According to the embodiment of the invention, a plurality of groups of piston rings 2 are arranged between the piston 1 and the inner cylinder of the shock absorber, and a Gellan ring 3 is also arranged between the adjacent piston rings 2. The piston ring 2 and the Gelai ring 3 are both fixed in a groove on the outer side of the piston 1.

According to an embodiment of the invention, the spool valve 5 is provided with a spool valve spring 6. An adjusting screw 4 is also provided close to the core valve spring 6. The adjusting screw 4 is used to adjust the pressure of the core valve spring 6 and thus the size of the working valve here, and thus the liquid flow through the valve of the core valve 5. The structural arrangement between the working valve and the core valve spring 6 belongs to the prior art, and is not described in detail. The flow direction of the liquid passing through the piston assembly is unidirectional, and the flow directions of the liquid passing through the two sides of the piston 1 are opposite, so that when the core valve 5 and the positioning pin 7 are arranged, the corresponding position change is required according to the flow direction of the liquid.

According to the embodiment of the invention, when the anti-snake piston assembly is designed, the requirement of the damping performance of the anti-snake shock absorber cannot be met by the original piston structure in consideration of the fact that the nominal speed of the anti-snake shock absorber is low, the load is large, namely the damping coefficient is large. In order to meet the damping performance requirement of the anti-snake vibration absorber, the internal leakage between the piston assembly and the pressure cylinder must be reduced, so that the gray ring 3 is added on the piston assembly while the original piston sealing and guiding structure is reserved.

According to the embodiment of the invention, because of the anti-meandering shock absorber, the damping force is larger, the oil flow is larger, the impact of hydraulic oil on the valve system is larger, and the stability of the piston valve system during operation is ensured. The original core valve 5 structure is changed, a limiting guide post is added on the core valve 5, and meanwhile, a positioning pin 7 of the core valve 5 is added on a piston body, so that the stability of the valve system in working is ensured.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Claims

1. A piston assembly for a dual cycle anti-hunting oil pressure shock absorber for a high speed motor train, comprising: the piston is provided with a channel through which oil flows through the piston, and the core valve is arranged in the channel, and the piston is characterized in that the core valve is provided with a limit guide post integrally connected with the core valve, the end part of the limit guide post is connected with a positioning pin in a matched manner, and the positioning pin is fixedly riveted with the piston;

a plurality of groups of piston rings are arranged between the piston and the inner cylinder of the shock absorber, and a Gelai ring is arranged between the adjacent piston rings; the piston ring and the Gelai ring are both fixed in a groove at the outer side of the piston;

the core valve is provided with a core valve spring.

2. The piston assembly for a dual cycle anti-hunting oil pressure shock absorber for high speed electric vehicles according to claim 1, wherein an adjustment screw is also provided adjacent to the core valve spring.