CN101857038B - Linear shock absorber for railway vehicles - Google Patents
Linear shock absorber for railway vehicles Download PDFInfo
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- CN101857038B CN101857038B CN2009101339159A CN200910133915A CN101857038B CN 101857038 B CN101857038 B CN 101857038B CN 2009101339159 A CN2009101339159 A CN 2009101339159A CN 200910133915 A CN200910133915 A CN 200910133915A CN 101857038 B CN101857038 B CN 101857038B
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Abstract
The invention provides a linear shock absorber (1) for railway vehicles, comprising a first fluid chamber (6) which is divided to be at the side of a piston rod (4) by a piston (5) fixed on the piston rod (4) in a cylinder (3) and a second fluid chamber (7) which is divided to be at the side opposite to the piston rod (4) by the piston (5) in the cylinder (3), wherein the first fluid chamber (6) is connected with a working fluid tank (10) by an expansion side damping valve (22) and a first check valve (21) which are parallel to each other; and the second fluid chamber (7) is connected with the working fluid tank (10) by a compression side damping valve (37) and a second check valve (36) which are parallel to each other. Neither of the two fluid chambers is under negative pressure, and the compression side damping valve (37) and the expansion side damping valve (22) generate stable damping force relative to expansion of the piston rod (4).
Description
Technical field
The present invention relates between a kind of car body and chassis that is located in railway vehicle, the linear shock absorber of the relative displacement of the flat pendulum direction between car body and chassis that is used to decay.
Background technology
For the car body of the railway vehicle of decaying and the relative displacement of the flat pendulum direction between the chassis, known have between chassis and car body folder establish linear shock absorber.The JP2001-241483A of Japan's special permission Room calendar year 2001 distribution discloses a kind of structure that can be used for the linear shock absorber of above-mentioned purpose.
Adopt technology in the past, linear shock absorber contains piston in cylinder, and the piston rod that is fixed on the piston is outstanding from cylinder vertically.The inboard of cylinder by piston be divided into piston rod side the 1st grease chamber and with the 2nd grease chamber of piston rod side opposition side.
When piston gets into direction in the cylinder, is the shrinkage direction of bumper when sliding that to piston rod the 2nd grease chamber shrinks, the 1st grease chamber enlarges.A part of power fluid of the 2nd grease chamber flow in the 1st grease chamber by the dash pot valve of being located on the piston.Unnecessary a part of power fluid of the 2nd grease chamber flows out in the power fluid fuel tank through the basic valve of being located at cylinder bottom portion, in this process, produces to press the side dumping force.
The direction of stretching out from cylinder to piston rod when piston, be the prolonging direction of bumper when sliding, shrink the 1st grease chamber, and the 2nd grease chamber enlarges.The power fluid of the 1st grease chamber is pushed disc valve open and is flow in the 2nd grease chamber, in this process, produces and stretches the side dumping force.In addition, power fluid also flow into the 2nd grease chamber from the power fluid fuel tank by the check valve of being located on the basic valve with having no resistance.
In technological in the past linear shock absorber, when pressing the side action, supply with power fluid to the 1st grease chamber and rely on the inflow power fluid that has passed through cutoff port from the 2nd grease chamber.Therefore, the 1st grease chamber that enlarges in the time of need avoiding pressing the side action designs to negative pressureization.That is, even need be designed to press the side action also can the 1st grease chamber be remained positive pressure Px.Its result, establishing piston area is A, and the pressure of establishing the 2nd grease chamber is P, and establishing the piston rod sectional area is Ax, and the pressure of establishing the 1st grease chamber is Px, the generation damping force F when pressing the side action is represented with following formula (1).
F＝A·P-(A-Ax)·Px (1)
That is, produce damping force F for from press the side dumping force, deducting the power that is equivalent to (A-Ax) Px.
At the linear shock absorber of the relative displacement of the flat pendulum direction on be used for decaying car body and chassis, the dumping force that requirement equates in stretching the side action and pressing the side action.But, under above-mentioned damping force characteristic, be difficult in stretching the side action and pressing the side action, produce the dumping force that equates.
Summary of the invention
Therefore, the structure that the objective of the invention is to the oil hydraulic circuit through designing linear damper improves the pressure side dumping force of linear shock absorber.
In order to achieve the above object, linear shock absorber for railway vehicles of the present invention comprises: cylinder; Piston rod, its end from cylinder enters into cylinder; Piston, it is fixed in cylinder on the piston rod, can be accommodated in the cylinder with being free to slide; The 1st fluid chamber, it is divided in piston rod side by piston in cylinder; The 2nd fluid chamber, it is divided in a side opposite with piston rod by piston in cylinder; The working fluid case, it is used to store working fluid; Stretch the side dash pot valve, it flows out working fluid to the working fluid case from the 1st fluid chamber under the damping of regulation; Press the side dash pot valve, it flows out working fluid to the working fluid case from the 2nd fluid chamber under the dumping force of regulation; The 1st check valve, it flow in the 1st fluid chamber working fluid of working fluid case with having no resistance, and cuts off the circulation of oppositely directed working fluid; The 2nd check valve, it flow in the 2nd fluid chamber working fluid of working fluid case with having no resistance, and cuts off the circulation of oppositely directed working fluid.
Describe in the following record in specification sheets of detailed content of the present invention and other characteristic, advantage, shown in the accompanying drawing of apposition.
Description of drawings
Fig. 1 is the longitudinal section of linear shock absorber for railway vehicles of the present invention.
Fig. 2 is the sectional elevation of the linear shock absorber that dissects of the II-II line along Fig. 1.
Fig. 3 is the longitudinal section of stretching the side dash pot valve that the III-III line along Fig. 2 dissects.
Fig. 4 is the oil hydraulic circuit figure of linear shock absorber.
The specific embodiment
With reference to Fig. 1, the linear shock absorber 1 that railway vehicle is used is for the relative displacement of the flat pendulum direction on the car body of the railway vehicle of decaying and chassis and be located between car body and the chassis.
Linear shock absorber 1 comprises: the outer sleeve 2 that an end combines with ring element 11, be formed in the inboard cylinder 3 of outer sleeve 2 coaxially, entering into the piston rod 4 of outer sleeve 2 and cylinder 3 vertically with ring element 11 opposite sides with outer sleeve 2.Cardinal extremity at piston rod 4 is fixed with another ring element 12.Linear shock absorber 1 is connected with the chassis with car body with 12 by ring element 11.
Top at the piston rod 4 that enters into cylinder 3 inboards is connected with piston 5.The inboard of cylinder 3 be divided into by piston 5 piston rod 4 sides conduct the 1st fluid chamber the 1st grease chamber 6 and with the 2nd grease chamber 7 of conduct the 2nd fluid chamber of piston rod 4 opposition sides.Be filled with power fluid in the grease chamber 6 and 7.
It is airtight by guide block 8 to be positioned at a peristome side opposite with ring element 11, outer sleeve 2 and cylinder 3.Piston rod 4 can in guide block 8, be free to slide in guide block 8.The columnar cover 9 that the piston rod 4 in outer sleeve 2 outsides is fixed on the ring element 12 covers.
Be provided with the power fluid fuel tank 10 of having enclosed power fluid and gas in the annular gap between cylinder 3 and the outer sleeve 2 as the working fluid case.
The 1st grease chamber 6 is by being built in the 1st in the guide block 8, shown in Figure 2 check valve 21 and stretching side dash pot valve 22 and be connected with power fluid fuel tank 10.
With reference to Fig. 2, the 1st check valve 21 comprises spool 21a and retracing spring 21b, and this spool 21a faces with space 23 mutually, is located on the valve seat 21c; This retracing spring 21b to spool 21a towards the valve seat 21c application of force.Always in space 23, import power fluid by inflow shown in Figure 1 with pipe 24 from the central portion of power fluid fuel tank 10.In addition, be in order to prevent that gas is blended into the power fluid that is directed in the space 23 through flowing into managing 24 central portions importing power fluides from power fluid fuel tank 10.
Spool 21a rises along with the pressure of the 1st grease chamber 6 reduces from valve seat 21c, and the power fluid of power fluid fuel tank 10 is imported in the 1st grease chamber 6 through space 23 with having no resistance.On the other hand, be under the high-voltage situation in the 1st grease chamber 6, spool 21a is located on the valve seat 21c, and the partition power fluid is moving to power fluid fuel tank 10 from the 1st grease chamber 6.
With reference to Fig. 3, stretch side dash pot valve 22 and comprise spool 22a and spring 22b, this spool 22a faces with space 25 mutually, is located on the valve seat 22c; This spring 22b to spool 22a towards the valve seat 22c application of force.Space 25 always is connected with the 1st grease chamber 6 through the path 26 that is formed in the guide block 8.Spring 22b is different with retracing spring 21b, and spring 22b is set to, and 25 pressure does not rise to and can not make the such spring-load (spring load) of spool 22a rising more than the regulation in the space.In addition, after spool 22a rose, spring 22b also can increase to the application force that closes the valve direction spool 22a according to the ascending amount of spool 22a.On the basis of said structure, stretch the pressure of side dash pot valve 22 and rise to regulation and open when above in the 1st grease chamber 6, make power fluid when flow out the 1st grease chamber 6, produce the dumping force of stipulating to power fluid fuel tank 10.
Stretching side dash pot valve 22 preferably constitutes and produces the apportioning valve of stretching the side dumping force that is directly proportional to the responsiveness of stretching side with piston 5.Through the shape of design spool 22a, can set the relation of ascending amount and the aperture area of spool 22a, have characteristic so that stretch side dash pot valve 22 as apportioning valve.
Be provided with basic valve 35 in the bottom of cylinder 3.Be provided with the 2nd check valve 36 on the basic valve 35 side by side and pressing side dash pot valve 37, the 2 check valves 36 to make power fluid have no resistance ground to the 2nd grease chamber 7, to flow into, and cutting off oppositely directed power fluid and circulate from power fluid fuel tank 10; These pressure side dash pot valve 37 pressure in the 2nd grease chamber 7 rise under the situation more than the regulation, make power fluid when power fluid fuel tank 10 flows out, produce the dumping force of regulation from the 2nd grease chamber 7.
The structure of the 2nd check valve 36 is identical with the 1st check valve 21.The structure of pressing side dash pot valve 37 is with to stretch side dash pot valve 22 identical.Therefore, omit the 2nd check valve 36 and the detailed description of pressing side dash pot valve 37 at this.
Open when on piston 5, being provided with 6 surpressures side by side and the power fluid of the 1st grease chamber 6 is flowed out to and stretch side by pass valve 31 in the 2nd grease chamber 7, and open during 7 surpressures in the 2nd grease chamber and make the power fluid of the 2nd grease chamber 7 flow out to the pressure side by pass valve 32 in the 1st grease chamber 6 in the 1st grease chamber.It is to produce excessive dumping force in order to prevent when on piston rod 4, acting on the speed that excessive shrinkage direction or prolonging direction are arranged imports that these by pass valves 31 and 32 are set, and avoids the breakage of linear shock absorber 1.Therefore, when the relative displacement of the flat pendulum direction between car body and chassis was in common scope, by pass valve 31 and 32 kept blocking.
With reference to Fig. 4, the linear shock absorber for railway vehicles 1 that more than constitutes is when the pressure side action of piston 5, and the power fluid of the 2nd grease chamber 7 is being pressed the side dumping force through producing when pressing side dash pot valve 37 to flow in the power fluid fuel tank 10.The power fluid of power fluid fuel tank 10 is fed in the 1st grease chamber 6 through the 1st check valve 21 with having no resistance.In addition, linear shock absorber 1 is stretched side when action piston 5, and the power fluid of the 1st grease chamber 6 is being stretched the side dumping force through producing when stretching side dash pot valve 22 and flow in the power fluid fuel tank 10.The power fluid of power fluid fuel tank 10 flow in the 2nd grease chamber 7 through the 2nd check valve 36 with having no resistance.Therefore, it is a direction with respect to shrinkage direction that linear shock absorber 1 makes the circulation of power fluid, is other direction with respect to prolonging direction, and promptly linear shock absorber 1 is as the linear shock absorber performance function of so-called bidirectional flow type.
As stated, in linear shock absorber for railway vehicles of the present invention, the 1st grease chamber 6 is connected with power fluid fuel tank 10 with the 1st check valve 21 through the side dash pot valve 22 of stretching arranged side by side, and therefore, when the pressure side action of piston 5, the 1st grease chamber 6 of expansion can negative pressureization.In addition, the 2nd grease chamber 7 is connected with power fluid fuel tank 10 with the 2nd check valve 36 through pressure side dash pot valve 37 arranged side by side, and therefore, stretching side when action of piston 5, the 2nd grease chamber 7 of expansion can negative pressureization.
Therefore, as stated, establishing piston area is A, and the pressure of establishing the 2nd grease chamber 7 is P, and establishing the piston rod sectional area is Ax, and the pressure of establishing the 1st grease chamber 6 is Px, when Px=0, can produce the represented damping force F of following formula (2) during contractive action.
F＝A·P (2)
Therefore, use the cylinder of same size can produce ratio technological big dumping force in the past.
In addition, when contractive action, can not receive the pressure influence of the 1st grease chamber 6 yet, therefore, be easy to generate and the dumping force of stretching side when action identical characteristics.
More than, describe the present invention through several certain embodiments, but the present invention is not limited to above-mentioned each embodiment.For a person skilled in the art, can be in the technical scope of claim to additional various modifications of these embodiment or change.
For example, in above embodiment, use power fluid as working fluid, but working fluid also can use incompressible fluid arbitrarily.
For example, also can replace stretching side by pass valve 31 and be provided with and stretch the side dash pot valve, replace pressing side by pass valve 32 and be provided with and press the side dash pot valve.
Exclusiveness that embodiments of the invention are included or speciality are as claimed in claim.
Claims (5)
1. a linear shock absorber for railway vehicles (1), it comprises:
Cylinder (3);
Piston rod (4), its end from cylinder (3) enters into cylinder (3);
Piston (5), it is fixed in cylinder (3) on the piston rod (4), can be accommodated in the cylinder (3) with being free to slide;
The 1st fluid chamber (6), it is divided in piston rod (4) side by piston (5) in cylinder (3);
The 2nd fluid chamber (7), it is divided in a side opposite with piston rod (4) by piston (5) in cylinder (3);
Working fluid case (10), it is used to store working fluid;
Stretch side dash pot valve (22), it flows out working fluid to working fluid case (10) from the 1st fluid chamber (6) under the dumping force of regulation;
Press side dash pot valve (37), it flows out working fluid to working fluid case (10) from the 2nd fluid chamber (7) under the dumping force of regulation;
The 1st check valve (21), it flow in the 1st fluid chamber (6) working fluid of working fluid case (10) with having no resistance, and cuts off the circulation of oppositely directed working fluid;
The 2nd check valve (36), it flow in the 2nd fluid chamber (7) working fluid of working fluid case (10) with having no resistance, and cuts off the circulation of oppositely directed working fluid.
2. linear shock absorber for railway vehicles according to claim 1 (1), this linear shock absorber for railway vehicles (1) also comprises: the outer sleeve (2) that covers the outside of cylinder (3); Guide block (8), the peristome of its closed cylinder (3) and overcoat (2) so that the mode that piston rod (4) can be free to slide guides piston rod (4), is stretched side dash pot valve (22) and is built in the guide block (8).
3. linear shock absorber for railway vehicles according to claim 2 (1), the 1st check valve (21) is built in the guide block (8).
4. according to claim 2 or 3 described linear shock absorber for railway vehicles (1), press side dash pot valve (37) to be disposed at the bottom of cylinder (3).
5. linear shock absorber for railway vehicles according to claim 4 (1) presses side dash pot valve (37) and the 2nd check valve (36) to be installed on the bottom of cylinder (3) side by side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101339159A CN101857038B (en) | 2009-04-10 | 2009-04-10 | Linear shock absorber for railway vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101339159A CN101857038B (en) | 2009-04-10 | 2009-04-10 | Linear shock absorber for railway vehicles |
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| Publication Number | Publication Date |
|---|---|
| CN101857038A CN101857038A (en) | 2010-10-13 |
| CN101857038B true CN101857038B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101339159A Active CN101857038B (en) | 2009-04-10 | 2009-04-10 | Linear shock absorber for railway vehicles |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438140B (en) * | 2013-08-28 | 2015-09-23 | 株洲南车时代电气股份有限公司 | A kind of pantograph damper damping throttling arrangement |
| CN106641075B (en) * | 2016-11-30 | 2019-03-29 | 江西洪都航空工业集团有限责任公司 | A kind of two-stage vent plug formula buffer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB296712A (en) * | 1927-09-05 | 1929-07-18 | Rheinische Metallw & Maschf | Improvements in hydraulic brakes or shock absorbing devices, such as railway vehiclebuffers |
| US4240531A (en) * | 1977-12-12 | 1980-12-23 | Itt Industries, Inc. | Low-wear shock absorber |
| US4423801A (en) * | 1980-04-09 | 1984-01-03 | Tokico Ltd. | Shock absorber |
| CN2619849Y (en) * | 2003-03-18 | 2004-06-09 | 益阳市轴瓦厂 | Oil hydraulic vibration damper |
-
2009
- 2009-04-10 CN CN2009101339159A patent/CN101857038B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB296712A (en) * | 1927-09-05 | 1929-07-18 | Rheinische Metallw & Maschf | Improvements in hydraulic brakes or shock absorbing devices, such as railway vehiclebuffers |
| US4240531A (en) * | 1977-12-12 | 1980-12-23 | Itt Industries, Inc. | Low-wear shock absorber |
| US4423801A (en) * | 1980-04-09 | 1984-01-03 | Tokico Ltd. | Shock absorber |
| CN2619849Y (en) * | 2003-03-18 | 2004-06-09 | 益阳市轴瓦厂 | Oil hydraulic vibration damper |
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| CN101857038A (en) | 2010-10-13 |
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Address after: Tokyo, Japan, Japan Patentee after: KAYABA INDUSTRY CO LTD Address before: Tokyo, Japan, Japan Patentee before: Kayaba Industry Co., Ltd. |