CN111306235A

CN111306235A - Anti-snaking shock absorber, bogie and railway vehicle

Info

Publication number: CN111306235A
Application number: CN201911048934.1A
Authority: CN
Inventors: 徐腾养; 秦剑生
Original assignee: Zhejiang Dunan Track Traffic Equipment Co ltd
Current assignee: Zhejiang Dunan Track Traffic Equipment Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-19

Abstract

The invention relates to and provides an anti-snaking shock absorber, which comprises a first cylinder body, a second cylinder body, an oil guide pipe, a first one-way valve assembly, a second one-way valve assembly and a damping assembly, wherein the first cylinder body is connected with the first cylinder body; a first cylinder cavity is formed in the first cylinder body and embedded in the second cylinder body, a second cylinder cavity is formed between the first cylinder body and the second cylinder body, and the first check valve assembly is connected to the inner wall of the first cylinder cavity in a sliding mode and divides the first cylinder cavity into a first cavity and a second cavity; the oil guide pipe is arranged in the second cylinder body and is used for communicating the first cavity with the second cylinder cavity; the second one-way valve assembly is arranged between the second cylinder cavity and the second cavity; the damping component is arranged at one end, relatively close to the second cavity, of the second cylinder body, one end of the damping component is communicated with the first cavity, the other end of the damping component is communicated with the second cylinder cavity, and the damping component is used for communicating the first cavity with the second cylinder cavity when the oil pressure is larger than the damping force. The invention also relates to a bogie and a railway vehicle.

Description

Anti-snaking shock absorber, bogie and railway vehicle

Technical Field

The invention relates to the technical field of rail transit, in particular to an anti-snaking shock absorber, a bogie and a rail vehicle.

Background

When the running speed of the railway vehicle is increased, the bogie generates a periodic large-amplitude swinging motion in the transverse direction, namely snaking vibration. Severe hunting vibration can cause instability, and once the instability occurs, wheels can violently impact the track, and even the risk of derailment of the wheels occurs, thereby threatening the running safety of the vehicle. The anti-hunting shock absorber can effectively suppress hunting vibration of the bogie, thereby ensuring that the railway vehicle safely runs at a speed lower than a hunting critical speed.

In traditional anti-snake movement shock absorber, damping device sets up inside the shock absorber mostly, for example on piston or the bottom valve seat, when damping performance is weakened along with using, will need to adjust the damping performance of shock absorber, otherwise will seriously influence track vehicle's snake movement stability, security, operating stability and riding comfort etc.. However, for the conventional anti-hunting shock absorber, the whole shock absorber needs to be disassembled, and the damping device needs to be taken out separately to adjust the damping performance of the shock absorber, which is inconvenient.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an anti-hunting shock absorber with a damping force easily adjustable in view of the above-mentioned prior art.

A second technical problem to be solved by the present invention is to provide a bogie that is convenient for adjusting the damping force in view of the above-mentioned prior art.

A third technical problem to be solved by the present invention is to provide a railway vehicle with a damping force that is convenient to adjust, in view of the above-mentioned prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: an anti-hunting shock absorber is provided, comprising: the cylinder comprises a first cylinder body, a second cylinder body, an oil guide pipe, a first one-way valve assembly, a second one-way valve assembly and a damping assembly;

a first cylinder cavity is formed in the first cylinder body and embedded in the second cylinder body, a second cylinder cavity is formed between the first cylinder body and the second cylinder body, and the first check valve assembly is connected to the inner wall of the first cylinder cavity in a sliding mode and divides the first cylinder cavity into a first cavity and a second cavity;

the oil guide pipe is arranged in the second cylinder body and is used for communicating the first cavity with the second cylinder cavity; the second one-way valve assembly is disposed between the second cylinder chamber and the second chamber;

the damping assembly is arranged at one end, relatively close to the second cavity, of the second cylinder body, one end of the damping assembly is communicated with the first cavity, the other end of the damping assembly is communicated with the second cylinder cavity, and the damping assembly is used for communicating the first cavity with the second cylinder cavity when the oil pressure is larger than the damping force.

In one embodiment, in order to facilitate adjusting the damping magnitude of the anti-hunting shock absorber, the damping assembly includes a first housing, an adjuster, a spool valve, and a first resilient member;

the adjusting piece is blocked at one end of the inner wall of the first shell, the core valve is connected at the other end of the inner wall of the first shell and can move relative to the axis direction of the first shell, the first elastic piece is arranged in the first shell, one end of the first elastic piece abuts against the adjusting piece, and the other end abuts against the core valve;

the core valve is provided with a liquid inlet hole communicated with the first cavity, the side wall of the first shell is provided with a liquid outlet hole communicated with the second cylinder cavity, and the core valve can move towards the regulating part when being pressed so as to enable at least part of the liquid inlet hole to be communicated with the liquid outlet hole.

In one embodiment, in order to further facilitate the adjustment of the damping of the anti-hunting damper, at least two stations for fixing the adjusting member are arranged on the inner wall of the first housing, and the adjusting member can adjust the pre-tightening force of the first elastic member when the adjusting member is switched between at least two stations.

In one embodiment, the second one-way valve assembly includes a second valve seat and a second valve cover;

the second valve seat is fixed at one end of the first cylinder body and is provided with a second through hole penetrating along the axial line direction of the first cylinder body, the second valve cover is accommodated in the second chamber and covers the second valve seat, and the second valve cover can move towards the direction far away from the second valve seat when being pressed, so that the second cylinder chamber can be communicated with the second chamber through the second through hole.

In one embodiment, in order to prevent oil from being mixed with air and emulsified in the circulation process, the number of the second through holes is multiple, and the second through holes are arranged at intervals in the circumferential direction of the second valve seat and distributed on one side of the second valve seat.

In one embodiment, in order to improve the dynamic sealing performance between the rod body and the guide cover in the expansion and contraction process, the anti-snaking shock absorber further comprises a guide cover, a sealing element, a guide element and a rod body, wherein the guide cover is fixed at one end of the second cylinder body and is relatively close to the first chamber, one end of the rod body penetrates through the guide cover and is connected to the first check valve assembly, the guide cover is provided with a shaft hole for the rod body to penetrate through, the inner wall of the shaft hole abuts against the outer wall of the rod body, and the inner wall of the shaft hole is provided with a first groove for accommodating the sealing element and a second groove for accommodating the guide element.

In one embodiment, in order to further improve the dynamic sealing performance between the rod body and the guide cover, the number of the first grooves and the number of the second grooves are respectively set to be two, and the two first grooves and the two second grooves are respectively arranged in a crossed and spaced manner along the axial direction of the guide cover.

In one embodiment, in order to avoid the influence of dust in the air on the rod body in the stretching process, the anti-meandering damper further comprises a dust-proof piece embedded on the inner wall of the shaft hole, and a third groove used for accommodating the dust-proof piece is correspondingly formed in one end, relatively far away from the first cylinder body, of the inner wall of the shaft hole.

In one embodiment, in order to improve the static sealing performance between the rod body and the guide cover in the telescopic process, the anti-snaking damper further comprises a second elastic member sleeved on the guide cover, a fourth groove used for accommodating the second elastic member is formed in the side wall of the guide cover, and the inner wall of the second elastic member abuts against the outer wall of the fourth groove.

The technical scheme adopted by the invention for solving the second technical problem is as follows: there is provided a bogie comprising a frame, a wheel set and an anti-hunting shock absorber according to any one of the preceding claims.

The technical scheme adopted by the invention for solving the third technical problem is as follows: a rail vehicle is provided comprising the bogie as described above.

Compared with the prior art, the invention has the beneficial effects that: the damping assembly is arranged on the second cylinder body, when the damping force of the anti-snaking shock absorber needs to be adjusted, the adjustment of the damping force can be realized without disassembling the shock absorber, and compared with the situation that a damping device is arranged in the shock absorber in the traditional anti-snaking shock absorber, the anti-snaking shock absorber greatly simplifies the damping force adjustment mode. In addition, the anti-snake motion shock absorber, the bogie and the rail vehicle have the advantages that oil flows in a single direction and returns oil when vibrating, the structure is simple and compact, the installation is convenient, the cost is low, and meanwhile, the anti-snake motion shock absorber, the bogie and the rail vehicle have good shock absorption performance.

Drawings

FIG. 1 is a schematic perspective view of an anti-hunting damper provided in accordance with one embodiment;

FIG. 2 is a schematic structural view of the anti-hunting damper shown in FIG. 1 with a portion of the structure omitted;

FIG. 3 is a cross-sectional view of the anti-snake damper shown in FIG. 1;

FIG. 4 is a schematic structural diagram of a damping assembly according to one embodiment;

FIG. 5 is a cross-sectional view of the damping assembly shown in FIG. 4;

FIG. 6 is a schematic structural view of a second one-way valve assembly provided in accordance with one embodiment;

FIG. 7 is a cross-sectional view of the second one-way valve assembly illustrated in FIG. 6;

FIG. 8 is an exploded schematic view of the second one-way valve assembly shown in FIG. 6;

FIG. 9 is a schematic perspective view of a guide cover according to an embodiment;

FIG. 10 is a cross-sectional view of the guide cap shown in FIG. 9;

FIG. 11 is a sectional view of the guide cover of FIG. 9 with a portion of the structure omitted;

FIG. 12 is a schematic illustration of a first one-way valve assembly according to one embodiment in a first viewing angle;

FIG. 13 is a cross-sectional view of the first one-way valve assembly illustrated in FIG. 12;

FIG. 14 is a schematic view of the first one-way valve assembly of FIG. 12 from a second perspective.

Reference numerals:

anti-hunting shock absorbers-100; a first cylinder-110; a first cylinder chamber-111; a first chamber-1111; a second chamber-1112; a second cylinder-120; a second cylinder chamber-121; an oil conduit-130; a first one-way valve assembly-140; a first valve seat-141; a first via-1411; a first valve cover-142; a first stop-143; a first tower spring-144; a second one-way valve assembly-150; a second valve seat-151; a second via-1511; a second valve cover-152; a second limiting member-153; a second tower spring-154; a damping assembly-160; a first housing-161; a liquid outlet hole-1611; an adjustment member-162; a core valve-163; liquid inlet hole-1631; a first elastic member-164; a guide cover-170; a shaft hole-171; a first groove-1711; a second groove-1712; third groove-1713; fourth groove-1714; a seal-172; guide-173; a dust guard-174; a second elastic member-175; a first passage-176; a rod body-180; a base-190; a second channel-191.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

It is to be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms of orientation such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these terms do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, an anti-hunting damper 100 according to a preferred embodiment of the present invention is shown in fig. 1, where fig. 1 is a schematic perspective view of the anti-hunting damper 100, fig. 2 is a schematic structural view of the anti-hunting damper 100 shown in fig. 1 with a portion of the structure omitted, and fig. 3 is a cross-sectional view of the anti-hunting damper 100 shown in fig. 1.

At present, the requirement on the speed of a rail vehicle is higher and higher, and meanwhile, better stability and riding comfort are required under the condition of high-speed running, however, when the speed of the rail vehicle is increased, the bogie generates snaking vibration in the transverse direction, so that wheels impact a rail and even derail, and the running safety of the rail vehicle is threatened. The anti-hunting damper 100 according to the present embodiment can be mounted on a bogie and used for a railway vehicle, and can reduce lateral vibration during operation.

Specifically, the anti-snake damper 100 includes a first cylinder 110, a second cylinder 120, an oil conduit 130, a guide cover 170, a base 190, a rod 180, a first check valve assembly 140, and a second check valve assembly 150.

The two ends of the second cylinder 120 are respectively fixed with a guide cover 170 and a base 190, the first cylinder 110 is embedded in the second cylinder 120, and the second cylinder 120 and the first cylinder 110 in this embodiment are both of a barrel structure with two open ends.

The guide cover 170 is fixed to one end of the second cylinder 120, and a flange (not shown) for closing one end of the first cylinder 110 is provided on an end surface of the guide cover 170 facing the base 190, and a first passage 176 is formed in the guide cover 170.

The base 190 is fixed to the other end of the second cylinder 120, and encloses a second cylinder chamber 121 having a substantially annular shape together with the guide cover 170, the second cylinder 120, and the first cylinder 110. The base 190 further defines a second channel 191 therein.

The second check valve assembly 150 is fixed to the first cylinder 110 near one end of the base 190, and the second check valve assembly 150, the flange of the guide cover 170 and the first cylinder 110 together enclose a first cylinder cavity 111 with a substantially cylindrical shape for controlling the connection and disconnection between the second cylinder cavity 121 and the first cylinder cavity 111.

An oil guide pipe 130 is disposed in the annular second cylinder chamber 121 and extends in the axial direction of the second cylinder 120, and a third passage (not shown) is formed inside the oil guide pipe 130. The two ends of the oil conduit 130 extend into the guide cover 170 and the base 190, respectively, and the first passage 176 in the guide cover 170 is communicated with the second passage 191 in the base 190 through the third passage. In this embodiment, the number of the oil guide pipes 130 is two, and the oil guide pipes are arranged at intervals in the second cylinder chamber 121.

The first check valve assembly 140 is slidably connected to an inner wall of the first cylinder chamber 111, divides the first cylinder chamber 111 into a first chamber 1111 and a second chamber 1112, and controls connection and disconnection between the second chamber 1112 and the first chamber 1111.

One end of the rod 180 passes through the guide cover 170 and is connected to the first check valve assembly 140, so that when the anti-snaking damper 100 is subjected to lateral vibration, the rod 180 drives the first check valve assembly 140 to extend and contract along the axis direction thereof, so as to convert the mechanical energy generated by the vibration into the heat energy inside the damper.

In this embodiment, a protective cover (not shown) is further sleeved outside the second cylinder 120, the protective cover is substantially a barrel-shaped structure with an open end, the other end of the rod 180 is fixed on the inner wall of the protective cover, and can extend and slide together with the protective cover relative to the axis direction of the second cylinder 120, so as to effectively prevent external sand and dust and flying stones from affecting the oil seal of the shock absorber and the rod 180, and prevent the rod 180 from being contaminated by dust in the air during the reciprocating movement relative to the first cylinder cavity 111, which results in the contamination of oil inside the shock absorber.

When the anti-snake shock absorber 100 is oscillated, the rod 180 drives the first check valve assembly 140 to slide in the first cylinder cavity 111 toward the base 190, at this time, the second chamber 1112 is compressed, the first chamber 1111 is stretched, the first check valve assembly 140 is opened to communicate the second chamber 1112 with the first chamber 1111, the oil flows from the second chamber 1112 to the first chamber 1111, and sequentially flows to the second passage 191 and the second cylinder cavity 121 in the base 190 through the first passage 176 and the third passage, at this time, since the oil pressure in the second cylinder cavity 121 is greater than the oil pressure in the second chamber 1112, the second check valve assembly 150 is opened to communicate the communication between the second cylinder cavity 121 and the second chamber 1112, so that the oil flows from the second cylinder cavity 121 to the second chamber 1112, thereby completing a complete compression cycle of the anti-snake shock absorber 100.

Further, the anti-hunting shock absorber 100 further includes a damping assembly 160 disposed on the base 190, wherein one end of the damping assembly 160 is communicated with the second channel 191, and the other end is communicated with the second cylinder chamber 121, so as to open the communication between the second channel 191 and the second cylinder chamber 121 when the damping force is greater than the preset value.

It can be understood that the vibration reduction principle of the damper, i.e., the "orifice throttling" principle, converts the transmitted vibration of the wheel pair into internal energy, wherein a part of the internal energy is absorbed by oil, and a part of the internal energy is dissipated in the ambient air through external heat transfer. The oil absorbs a part of internal energy to increase the internal temperature of the shock absorber, and the dynamic viscosity of the oil is influenced by the temperature increase, so that the damping performance of the shock absorber is influenced.

Specifically, the oil temperature rise will cause the oil molecule cohesion to weaken, the dynamic viscosity to reduce, make the damping performance weaken greatly; the phenomenon of oil cavitation can be caused by overhigh temperature, so that the oil supply of the shock absorber is insufficient, the dynamic characteristic of the shock absorber is distorted, and simultaneously, huge abnormal sound is also accompanied; the temperature of the oil rises, the vibration damping characteristic is greatly weakened, and the snaking stability, safety, stability, riding comfort and the like of the vehicle are indirectly influenced.

Therefore, after the shock absorber works for a period of time, the damping performance is reduced, and the use requirement of the shock absorber cannot be met. The traditional shock absorber is characterized in that a damping device of the shock absorber is arranged in the shock absorber, the shock absorber needs to be disassembled integrally and the damping device needs to be taken out when the damping force needs to be adjusted, the adjusting mode is very inconvenient, and the stability of the shock absorber can be influenced in the assembling and disassembling process.

And in the anti-snake movement shock absorber 100 in this embodiment, damping subassembly 160 is the modularization setting to be fixed in on the base 190, when the damping force size was adjusted to needs, only need be used for damping subassembly 160 through adjusting the frock work and can realize the regulation of damping force size, whole process is simple convenient, easy operation, and owing to need not disassemble and assemble the shock absorber, so can not cause the influence to the steadiness and the stability of shock absorber.

Further, referring to fig. 4 and 5 together, a damping assembly 160 according to the preferred embodiment is provided, fig. 4 is a schematic structural diagram of the damping assembly 160, and fig. 5 is a sectional view of the damping assembly 160 shown in fig. 4.

The damping assembly 160 includes a first housing 161, an adjuster 162, a spool valve 163, and a first elastic member 164. The adjusting member 162 is plugged at one end of the inner wall of the first casing 161, and an O-ring (not shown) is disposed between the outer wall of the adjusting member 162 and the inner wall of the first casing 161. The core valve 163 is connected to the other end of the inner wall of the first casing 161 and can move relative to the axial direction of the first casing 161, the first elastic member 164 is disposed in the first casing 161, and one end of the first elastic member 164 abuts against the adjusting member 162, and the other end abuts against the core valve 163. The core valve 163 is provided with a liquid inlet 1631 communicated with the first chamber 1111, the side wall of the first casing 161 is provided with a liquid outlet 1611 communicated with the second cylinder 121, and the core valve 163 can move towards the adjusting member 162 when being pressed, so that at least part of the liquid inlet 1631 is communicated with the liquid outlet 1611.

In order to further facilitate the adjustment of the damping magnitude of the anti-hunting shock absorber 100, at least two stations for fixing the adjusting member 162 are disposed on the inner wall of the first housing 161, and the pre-tightening force of the first elastic member 164 can be adjusted when the adjusting member 162 is switched between the at least two stations. In the preferred embodiment, the inner wall of the first casing 161 and the outer wall of the adjusting member 162 can be fastened by a screw thread, and the pretightening force of the first elastic member 164 and the opening degree of the liquid inlet hole 1631 can be adjusted by controlling the depth of the adjusting member 162 screwed into the first casing 161, so as to adjust the damping force of the damping assembly 160. When the adjusting member 162 is screwed deeply, the pre-tightening force of the first elastic member 164 is larger, so that the core valve 163 needs to overcome the larger elastic force when being pressed and moved toward the adjusting member 162, so as to enable the liquid inlet hole 1631 to be at least partially communicated with the liquid outlet hole 1611.

The damping assembly 160 of this embodiment adopts the modularized design, and the damping characteristic uniformity is good, and this damping assembly 160 can be adjusted accurately, and the accommodation process is simple convenient, can not cause the influence to shock absorber overall structure.

It is understood that during assembly of the shock absorber, air is often mixed with oil. When the air got into the inner casing, under the high pressure effect, the air can make fluid produce emulsification, and fluid emulsification can greatly reduce the dynamic viscosity of fluid to influence the damping effect of shock absorber. Therefore, the oil of the damper cannot be contacted with air and dust, otherwise the oil can generate emulsification.

Referring to fig. 6 to 8 together, in order to prevent the oil from being mixed with air and emulsified during the circulation process, the embodiment provides a second check valve assembly 150 capable of preventing the oil from being mixed with air and emulsified during the circulation process, fig. 6 is a schematic structural view of the second check valve assembly 150, fig. 7 is a sectional view of the second check valve assembly 150 shown in fig. 6, and fig. 8 is an exploded schematic view of the second check valve assembly 150 shown in fig. 6.

The second one-way valve assembly 150 includes a second valve seat 151, a second valve cover 152, a second retainer 153, and a second tower spring 154.

The second valve seat 151 is fixed to one end of the first cylinder 110, and is provided with a second through hole 1511 penetrating along the axial direction of the first cylinder 110, and the second position-limiting member 153 is fixed to the inner wall of the second chamber 1112. The second valve cover 152 covers the second valve seat 151 and is movable in a direction away from the second valve seat 151 when pressurized, so that the second cylinder chamber 121 can communicate with the second chamber 1112 through the second through hole 1511. The second tower spring 154 is disposed between the second valve cap 152 and the second limiting member 153, and one end of the second tower spring 154 abuts against the second valve cap 152, and the other end abuts against the second limiting member 153, so that the second valve cap 152 always has a tendency of blocking the second through hole 1511.

Preferably, the number of the second through holes 1511 is set to be plural, and the plural second through holes 1511 are provided at intervals with respect to the circumferential direction of the second valve seat 151 and distributed at one side of the second valve seat 151.

In the process of returning oil from the second cylinder chamber 121 to the second chamber 1112, air in the second cylinder chamber 121 (belonging to a low-pressure chamber) is supplemented to the second chamber 1112 (belonging to a high-pressure chamber) along with the oil, and because the air density is less than that of the oil, when the shock absorber is horizontally placed, the air floats on the upper surface of the shock absorber, and only one side of the second valve seat 151 is provided with a second through hole 1511. When the shock absorber is installed, as long as one side of the second through hole 1511 is arranged at the lower end (namely, the second through hole 1511 and air are arranged at the upper side and the lower side), oil can be only supplemented to the second chamber 1112 from the lower side during oil return, and since the oil return hole is not formed in the upper surface of the shock absorber, air cannot enter the second chamber 1112 along with the oil in the oil supplementing process to the second chamber 1112, so that the emulsification phenomenon of the oil can be effectively avoided through an oil-gas separation mode, the shock absorber has no idle stroke, and the damping force stability is high.

Further, in the conventional anti-snaking damper, the rod body needs to reduce the influence on the damping effect caused by oil leakage in a dynamic sealing mode in the process of moving relative to the guide cover. Traditional dynamic seal mostly adopts skeleton seal or the sealed single sealing mode of ripple, and this kind of single seal structure is convenient for install, and the cost is also comparatively cheap, but the oil leak phenomenon often takes place, has the potential safety hazard of serious oil leak.

Referring to fig. 9 to 11 together, the present embodiment provides a guide cover 170 capable of improving dynamic sealing performance between a rod 180 and the guide cover 170, where fig. 9 is a schematic perspective view of the guide cover 170, fig. 10 is a cross-sectional view of the guide cover 170 shown in fig. 9, and fig. 11 is a cross-sectional view of the guide cover 170 shown in fig. 9 with a part of the structure omitted.

Further, the guide cover 170 is provided with a shaft hole 171 for the rod body 180 to penetrate through, and a sealing member 172 for sealing the rod body 180 and a guide member 173 for guiding the rod body 180 are mounted on the inner wall of the shaft hole 171, so that the rod body 180 not only can realize dynamic sealing when moving in a telescopic manner relative to the axial direction of the guide cover 170, but also the rod body 180 can move more stably without inclination.

The inner wall of the shaft hole 171 abuts against the outer wall of the rod body 180, and the inner wall of the shaft hole 171 is provided with a first groove 1711 for accommodating the sealing member 172 and a second groove 1712 for accommodating the guide member 173. The number of the first recesses 1711 and the second recesses 1712 is set to two, and the two first recesses 1711 and the two second recesses 1712 are arranged at intervals in a crossing manner in the axial direction of the guide cover 170, respectively. So set up, can greatly promote the dynamic seal performance between the body of rod 180 and the direction lid 170. It is understood that the number and arrangement of the first and

second recesses

1711 and 1712 are only one preferred embodiment, and the present invention is not limited thereto.

In this embodiment, the seal 172 is preferably, but not limited to, a steiner and the guide 173 is preferably made of wear resistant polytetrafluoroethylene.

Further, in order to avoid the influence of dust in the air on the rod body 180 during the expansion and contraction process, the anti-snake damper 100 further includes a dust-proof member 174 embedded on the inner wall of the shaft hole 171, and a third groove 1713 for accommodating the dust-proof member 174 is correspondingly formed at one end of the inner wall of the shaft hole 171, which is relatively far away from the first cylinder 110.

Further, still need avoid the oil leak phenomenon between the body of rod 180 and the direction lid 170 through the static seal on the direction lid 170, traditional static seal more adopts the axial compression O type circle in order to realize the purpose of radial seal, and its installation is convenient relatively, but because the O type circle compression ratio is great, ageing, the sclerosis phenomenon very easily produces, still has serious oil leak potential safety hazard.

In order to improve the static sealing performance between the rod 180 and the guide cover 170 during the extension and retraction process, the anti-snaking damper 100 further includes a second elastic member 175 sleeved on the guide cover 170, a fourth groove 1714 for accommodating the second elastic member 175 is formed on the side wall of the guide cover 170, and the inner wall of the second elastic member 175 abuts against the outer wall of the fourth groove 1714. So set up, can guarantee that the flexible process of the 180 axial of the body of rod is more steady, sealing performance is good, the oil leak of difficult emergence slope, life is longer.

Referring to fig. 12 to 14 together, the first check valve assembly 140 according to the preferred embodiment is provided, fig. 12 is a schematic structural view of the first check valve assembly 140 at a first viewing angle, fig. 13 is a sectional view of the first check valve assembly 140 shown in fig. 12, and fig. 14 is a schematic structural view of the first check valve assembly 140 shown in fig. 12 at a second viewing angle.

The first check valve assembly 140 includes a first valve seat 141, a first valve cover 142, a first stopper 143, and a first tower spring 144. The first valve seat 141 is fixed at one end of the rod body 180 and moves synchronously with the rod body 180, the outer wall of the first valve seat 141 is in friction contact with the inner wall of the first chamber 1111, a plurality of first through holes 1411 penetrating along the axis direction of the first valve seat 141 are formed in the first valve seat 141, and the first through holes 1411 are arranged at intervals in the circumferential direction of the first valve seat 141.

The first limiting member 143 is fixed to the upper end of the first valve seat 141, and the first valve cover 142 is constrained between the first valve seat 141 and the first limiting member 143 and can move toward the first limiting member 143 to open the first sky 1411. The first tower spring 144 is disposed between the first valve cap 142 and the first limiting member 143, and one end of the first tower spring 144 abuts against the first valve cap 142 and the other end abuts against the first limiting member 143, so that the first valve cap 142 always has a tendency of blocking the first through hole 1411.

One embodiment of the present invention also provides a truck comprising a frame, a wheelset, and any of the above anti-hunting dampers 100. The bogie can provide the functions of bearing, guiding, damping, traction, braking and the like so as to ensure the stability and riding comfort of the railway vehicle during high-speed running.

One embodiment of the invention also provides a railway vehicle which comprises the bogie.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An anti-hunting shock absorber (100) comprising: the cylinder comprises a first cylinder body (110), a second cylinder body (120), an oil guide pipe (130), a first one-way valve assembly (140), a second one-way valve assembly (150) and a damping assembly (160);

a first cylinder cavity (111) is formed in the first cylinder body (110) and is embedded in the second cylinder body (120), a second cylinder cavity (121) is formed between the first cylinder body (110) and the second cylinder body (120), and the first one-way valve assembly (140) is connected to the inner wall of the first cylinder cavity (111) in a sliding mode and divides the first cylinder cavity (111) into a first chamber (1111) and a second chamber (1112);

the oil guide pipe (130) is arranged in the second cylinder body (120) and is used for communicating the first chamber (1111) with the second cylinder cavity (121), and the second one-way valve assembly (150) is arranged between the second cylinder cavity (121) and the second chamber (1112);

the damping assembly (160) is arranged at one end, close to the second cavity (1112), of the second cylinder body (120), one end of the damping assembly (160) is communicated with the first cavity (1111), the other end of the damping assembly is communicated with the second cylinder cavity (121), and the damping assembly is used for communicating the first cavity (1111) with the second cylinder cavity (121) when the oil pressure is larger than the damping force.

2. The anti-hunting shock absorber (100) according to claim 1, wherein said damping assembly (160) comprises a first housing (161), an adjuster (162), a spool valve (163), and a first resilient member (164);

the adjusting piece (162) is plugged at one end of the inner wall of the first shell (161), the core valve (163) is connected to the other end of the inner wall of the first shell (161) and can move relative to the axial direction of the first shell (161), the first elastic piece (164) is arranged in the first shell (161), one end of the first elastic piece (164) abuts against the adjusting piece (162), and the other end abuts against the core valve (163);

the core valve (163) is provided with a liquid inlet hole (1631) communicated with the first chamber (1111), the side wall of the first shell (161) is provided with a liquid outlet hole (1611) communicated with the second cylinder cavity (121), and the core valve (163) can move towards the adjusting piece (162) when being pressed so as to enable at least part of the liquid inlet hole (1631) to be communicated with the liquid outlet hole (1611).

3. The anti-hunting shock absorber (100) according to claim 2, wherein the inner wall of the first housing (161) is provided with at least two positions for fixing the adjusting member (162), and the adjusting member (162) can adjust the magnitude of the preload of the first elastic member (164) when switching between the at least two positions.

4. The anti-snake shock absorber (100) of claim 1 wherein the second one-way valve assembly (150) comprises a second valve seat (151) and a second valve cover (152);

the second valve seat (151) is fixed at one end of the first cylinder body (110), and is provided with a second through hole (1511) penetrating along the axial direction of the first cylinder body (110), the second valve cover (152) is accommodated in the second chamber (1112) and is covered on the second valve seat (151), and the second valve cover (152) can move towards the direction far away from the second valve seat (151) when being pressed, so that the second cylinder cavity (121) can be communicated with the second chamber (1112) through the second through hole (1511).

5. The anti-hunting vibration damper (100) according to claim 4, wherein the number of the second through holes (1511) is provided in plurality, and the plurality of second through holes (1511) are provided at intervals with respect to a circumferential direction of the second valve seat (151) and distributed on one side of the second valve seat (151).

6. The anti-hunting bumper (100) according to claim 1, wherein the anti-hunting bumper (100) further comprises a guide cap (170), a seal (172), a guide (173), and a rod (180);

the guide cover (170) is fixed to one end of the second cylinder body (120) and is relatively close to the first chamber (1111) to be arranged, one end of the rod body (180) penetrates through the guide cover (170) and is connected to the first one-way valve assembly (140), the guide cover (170) is provided with a shaft hole (171) for the rod body (180) to penetrate through, the inner wall of the shaft hole (171) is abutted to the outer wall of the rod body (180), and the inner wall of the shaft hole (171) is provided with a first groove (1711) for accommodating the sealing element (172) and a second groove (1712) for accommodating the guide element (173).

7. The anti-hunting vibration damper (100) according to claim 6, wherein the first recesses (1711) and the second recesses (1712) are respectively provided in two in number, and the two first recesses (1711) and the two second recesses (1712) are respectively arranged at intervals across in an axial direction of the guide cover (170).

8. The anti-hunting vibration damper (100) according to claim 6, further comprising a dust-proof member (174) embedded in an inner wall of the shaft hole (171), wherein an end of the inner wall of the shaft hole (171) relatively far from the first cylinder (110) is correspondingly formed with a third recess (1713) for receiving the dust-proof member (174).

9. The anti-hunting damper (100) according to any one of claims 6 to 8, wherein the anti-hunting damper (100) further comprises a second elastic member (175) sleeved on the guide cover (170), a fourth groove (1714) for accommodating the second elastic member (175) is formed on a side wall of the guide cover (170), and an inner wall of the second elastic member (175) abuts against an outer wall of the fourth groove (1714).

10. A bogie comprising a frame, a wheel set and an anti-hunting shock absorber (100) according to any one of claims 1 to 9.

11. A rail vehicle, characterized in that it comprises a bogie as claimed in claim 10.