AU2014339483B2 - Railway freight car car-coupler buffer - Google Patents
Railway freight car car-coupler buffer Download PDFInfo
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- AU2014339483B2 AU2014339483B2 AU2014339483A AU2014339483A AU2014339483B2 AU 2014339483 B2 AU2014339483 B2 AU 2014339483B2 AU 2014339483 A AU2014339483 A AU 2014339483A AU 2014339483 A AU2014339483 A AU 2014339483A AU 2014339483 B2 AU2014339483 B2 AU 2014339483B2
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- traction
- coupler
- buffering
- compression
- members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61G—COUPLINGS; DRAUGHT AND BUFFING APPLIANCES
- B61G9/00—Draw-gear
- B61G9/04—Draw-gear combined with buffing appliances
- B61G9/06—Draw-gear combined with buffing appliances with rubber springs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
Disclosed is a railway freight car car-coupler buffer comprising a car coupler, a coupler yoke fixedly connected to the car coupler, a traction buffer unit arranged within the coupler yoke, and a compression buffer unit connected to the bottom of the coupler yoke. Also, the traction buffer unit comprises multiple pairs of stacked traction buffer unit bodies; first positioning grooves and first positioning protrusions that fit with each other are provided on the contact surfaces of the traction buffer unit bodies in each pair of traction buffer unit bodies. Because the traction buffer unit is in a compressed state when providing a buffering effect, and the first positioning protrusions on the traction buffer unit bodies are embedded into the first positioning grooves during a compression process, lateral movement cannot be generated among the traction buffer unit bodies, as such, the entire buffer unit can only move in the longitudinal direction. This effectively prevents the buffer unit of the car-coupler buffer from generating a lateral movement while moving in the longitudinal direction, thus effectively preventing the car-coupler buffer from being damaged.
Description
RAILWAY FREIGHT CAR CAR-COUPLER BUFFER
[0001] The present application claims the benefit of priority to Chinese patent application No. 201310521115.0, titled “COUPLER BUFFER OF RAILWAY FREIGHT TRAIN”, filed with the Chinese State Intellectual Property Office on October 25, 2013, the entire disclosure of which is incorporated herein by reference.
TECHNIAL FIELD
[0002] The present application relates to the technical field of railway freight train manufacture, and particularly to a coupler buffer of a railway freight train.
BACKGROUND
[0003] A coupler buffer is an important part in a rolling stock. Cars or a car and a locomotive of the railway freight train are connected by the coupler buffer to form a train. The coupler buffer transmits and buffers a traction force and an impact force generated during running or shunting and marshalling operation of the railway vehicle.
[0004] Currently, the coupler buffer is required to have bidirectional buffering for buffering the traction force and impact force generated during the running or shunting and marshalling of the train. The structure of a conventional coupler buffer, which provides bidirectional buffering, is as shown in Figure 1. A coupler 01 is connected to a coupler yoke 07, and a follower 03 and a traction buffering unit 04 abutting against the follower 03 are installed in the coupler yoke 07, and a right end of the coupler yoke 07 is in contact with a compression buffering unit 05.
[0005] The traction buffering for the vehicle is implemented by the following way. A traction force is transmitted to the coupler yoke 07 from the coupler 01, and the right end of the coupler yoke 07 compresses the traction buffering unit 04, and the traction buffering unit 04 pushes the follower 03 to move forward, and allow the follower 03 to come into contact with a front follower stop 02 which is fixedly connected to a railway freight train, thus the traction of the coupler of the railway freight train is buffered.
[0006] The compression buffering of the vehicle is implemented by the following way. A compressive force is transmitted to the follower 03 from the coupler 01, and the follower 03 compresses the traction buffering unit 04, and the traction buffering unit 04, after being compressed, transmits the force to the coupler yoke 07, and the coupler yoke 07 compresses the compression buffering unit 05 in succession, allowing the compression buffering unit 05 to come into contact with a rear follower stop 06, thereby the compression of the coupler of the railway freight train is buffered.
[0007] A conventional traction buffering unit is generally composed of a circular steel spring, a rubber sheet, an elastic damper element, etc. The traction buffering unit, after being compressed, is apt to move transversely while moving longitudinally (i.e., the moving direction of the vehicle), which is prone to cause instability of the coupler buffer, and is possible to further damage the coupler buffer.
[0008] Therefore, it is a technical problem to be presently solved by the person skilled in the art to prevent a traction buffering unit of a coupler buffer from moving transversely while moving longitudinally.
[0008A] It is desired, therefore, to provide a coupler buffer of a railway wagon that alleviates one or more difficulties of the prior art, or that at least provides a useful alternative.
SUMMARY
[0009] Described herein is a coupler buffer of a railway freight train which prevents the coupler buffer from moving transversely while moving longitudinally, further avoiding the damage to the coupler buffer.
[0010] For solving the problem in the conventional technology, the coupler buffer of the railway freight train according to the present application includes: a coupler, a coupler yoke which is fixedly connected to the coupler, a traction buffering unit arranged in the coupler yoke, and a compression buffering unit connected to a right end of the coupler yoke, wherein the traction buffering unit includes multiple pairs of superimposed traction buffering members, and contact surfaces of the traction buffering members in each pair of superimposed traction buffering members are provided with a first positioning groove and a first positioning protrusion in cooperation with each other, wherein a traction reinforcing plate is further provided between two adjacent pairs of traction buffering members and is fixedly connected to the two adjacent pairs of traction buffering members, and an edge of the traction reinforcing plate is provided with an edgefold, and when a compression amount of the traction buffering unit reaches a maximum compression amount, adjacent traction reinforcing plates will abut against each other through the edgefold.
[0011] Deleted.
[0012] Preferably, a cross sectional area of the traction buffering member gradually increases from an end, in contact with another traction buffering member, of the traction buffering member to another end of the traction buffering member.
[0013] Preferably, traction buffering members in each pair of traction buffering members are each correspondingly provided with a deformable groove at a position in the middle of each of the contact surfaces of the traction buffering members.
[0014] Preferably, the first positioning protrusion is a conical frustum-shaped positioning protrusion.
[0015] Preferably, the material of the traction buffering member is a thermosetting elastomer.
[0016] Preferably, the compression buffering unit includes multiple bead-shaped compression buffering members sleeved on a guide rod.
[0017] Preferably, a compression reinforcing plate is provided between any two adjacent bead-shaped compression buffering members.
[0018] Preferably, each surface of the bead-shaped compression buffering members by which the bead-shaped compression buffering member is in contact with the compression reinforcing plate is provided with a second positioning groove, and the compression reinforcing plate is provided with a second positioning protrusion in cooperation with the second positioning groove.
[0019] Preferably, the material of the bead-shaped compression buffering members is a thermoplastic elastomer.
[0020] In the coupler buffer of the railway freight train according to the present application, a traction buffering unit is arranged in the coupler yoke, and a right end of the coupler yoke is connected to a compression buffering unit. The traction buffering unit includes multiple pairs of superimposed traction buffering members, and contact surfaces of traction buffering members in each pair of traction buffering members are provided with a first positioning groove and a first positioning protrusion cooperated with each other.
[0021] When the traction buffering unit provides buffering, the traction buffering unit is in a compressed state, and during the compression, the first positioning protrusion of one traction buffering member will be embedded into the first positioning groove of another traction buffering member, thus the traction buffering members cannot move transversely with respect to each other, and the whole traction buffering unit can only move longitudinally. This effectively prevents the traction buffering unit of the coupler buffer from moving transversely while moving longitudinally, effectively protecting the coupler buffer from being damaged.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021A] Some embodiments of the present invention are hereinafter described, by way of example only, with reference to the accompanying drawings, wherein: [0022] Figure 1 is a schematic view showing the internal structure of a coupler buffer; [0023] Figure 2 is a structural schematic view of a traction buffering unit in a coupler buffer of a railway freight train according to an embodiment of the present application; and [0024] Figure 3 is a structural schematic view of a compression buffering unit in the coupler buffer of the railway freight train according to the embodiment of the present application.
[0025] In Figures 1 to 3: 11 traction buffering member; 12 traction reinforcing plate; 13 first positioning protrusion; 14 deformable groove; 21 bead-shaped compression buffering member; 22 compression reinforcing plate; 23 second positioning protrusion; 24 second positioning groove; and 25 guide rod.
DETAILED DESCRIPTION
[0026] A coupler buffer of a railway freight train is provided according to the present application, which prevents a traction buffering unit in the coupler buffer from moving transversely while moving longitudinally, thereby avoiding damage to the coupler buffer.
[0027] For the person skilled in the art to better understand technical solutions of the present application, the present application is further described in detail in conjunction with the drawings and embodiments hereinafter.
[0028] The coupler buffer of the railway freight train according to the present application includes a coupler, a coupler yoke which is fixedly connected to the coupler, a traction buffering unit arranged the coupler yoke and a compression buffering unit connected to a right end of the coupler yoke. The improvements of the coupler buffer of the railway freight train with respect to the conventional technology lie in that, the traction buffering unit includes multiple pairs of superimposed traction buffering members 11, and contact surfaces of the traction buffering members 11 in each pair of traction buffering members 11 are provided with a first positioning groove and a first positioning protrusion 13 in cooperation with each other.
[0029] The traction buffering unit is configured to mainly buffer an impact force between cars during traction. The whole buffering process is implemented by the following way. A traction force is transmitted to the coupler yoke from the coupler, and the right end of the coupler yoke compresses the traction buffering unit, and the traction buffering unit pushes the follower to move forward, which allows the follower to come into contact with a front follower stop which is fixedly connected to a freight train, thereby the traction suffered by the coupler of the railway freight train is buffered.
[0030] As illustrated in the above traction buffering process, when the traction buffering unit provides buffering, the traction buffering unit itself is in a compressed state, and during the process of the compression, the first positioning protrusion 13 of one traction buffering member may be embedded into the first positioning groove of the corresponding traction buffering member, thus the traction buffering members 11 cannot move transversally with respect to each other, and the whole traction buffering unit can only move longitudinally. As shown in Figure 2, it effectively prevents the traction buffering unit of the coupler buffer from moving transversely while moving longitudinally, and allows the whole coupler buffer to move longitudinally and stably, thereby effectively protecting the coupler buffer from being damaged.
[0031] It is to be noted that, the longitudinal movement in the above embodiment refers to the movement of the coupler buffer in a running direction of the vehicle or in an extending direction of a rail.
[0032] Each pair of traction buffering members 11 in the above embodiment may be only provided with one pair of the first positioning groove and the first positioning protrusion 13 in cooperation with each other, and may also be provided with multiple pairs of the first positioning grooves and the first positioning protrusions 13, and when multiple pairs of the first positioning grooves and the first positioning protrusions 13 are provided, all the multiple first positioning protrusions 13 may be arranged on the same traction buffering member 11 or on two different traction buffering members 11, respectively. As shown in Figure 2, for allowing the buffering performance of each of the traction buffering members 11 to be uniform, each pair of traction buffering members 11 in this embodiment is provided with two first positioning protrusions 13, and the two first positioning protrusions 13 are respectively arranged on different traction buffering members 11. Correspondingly, the first positioning grooves matched with the first positioning protrusions 13 are respectively arranged on two different traction buffering members 11.
[0033] For allowing the traction buffering unit to not only have excellent buffer performance, but also have excellent force transmission performance, the traction buffering member 11 in this embodiment is made of a thermosetting elastomer, and a traction reinforcing plate 12 is further provided between two adjacent pairs of traction buffering members 11 and is fixedly connected to the two adjacent pairs of traction buffering members 11. Apparently, another traction reinforcing plate 12 should also be fixedly arranged outside the two ends of the traction buffering members 11, and an edge of the traction reinforcing plate 12 is provided with an edgefold for abutting against another adjacent traction reinforcing plate 12, as shown in Figure 2. The traction reinforcing plate 12 is made of a high strength metal material, and the traction reinforcing plate 12 and the traction buffering member 11 are adhered to an integral structure by an integrally vulcanizing technique, thus the traction buffering unit has a high strength and a high stability. When a compression amount of the traction buffering unit reaches the maximum compression amount, adjacent traction reinforcing plates 12 will abut against each other, thereby turning the whole traction buff unit into a rigidity body, and transmitting an overload of the traction buffering unit.
[0034] Further, for allowing the elastic modulus of the traction buffering unit to be varied, that is, allowing the traction buffering unit to have a decreased amount of deformation under equal pressure as the amount of compression increases, in this embodiment, the traction buffering member 11 is preferably designed in a form that a cross sectional area thereof gradually increases from an end, in contact with another traction buffering member 11, of the traction buffering member 11, to another end of the traction buffering member 11, as shown in Figure 2. This allows the whole traction buffering member 11 to be in a conical frustum, and two traction buffering members 11 in any pair of traction buffering members 11 are in contact with each other by the small ends.
[0035] For preserving enough space for the deformation of the traction buffering member 11, a deformable groove 14 is provided on each of the contact surfaces of the traction buffering members 11, and the deformable groove 14 is preferably provided at a position in the middle of the traction buffering members 11. Two deformable grooves 14 in corresponding traction buffering members 11 are arranged correspondingly, as shown in Figure 2.
[0036] The shape of the first positioning protrusion 13 may have many options, for example, a square shape, a circular shape, etc. The first positioning protrusion 13 in this embodiment is preferably a conical frustum-shaped positioning protrusion, as shown in Figure 2. Correspondingly, the first positioning groove in cooperation with the first positioning protrusion is also required to be configured in a conical frustum shape.
[0037] For further optimizing the technical solutions in the above embodiment, the compression buffering unit of the coupler buffer of the railway freight train specifically includes multiple bead-shaped compression buffering members 21 sleeved on a guide rod 25, as shown in Figure 3.
[0038] The compression buffering unit is mainly provided for buffering an impact force generated between cars when they moving towards each other. The whole buffering process thereof is implemented in the following way. A compressive force is transmitted to the follower from the coupler, and the follower compresses the traction buffering unit, and the traction buffering unit transmits the force to the coupler yoke after being compressed, and the coupler yoke compresses the compression buffering unit in succession, and the compression buffering unit comes to contact with a rear follower stop, thus the compression of the coupler of the railway freight train is buffered.
[0039] As illustrated in the above compression buffering process, when the compression buffering unit provides buffering, the compression buffering unit itself is also in a compressed state. Since all the bead-shaped compression buffering members 21 in the compression buffering unit are sleeved on the guide rod 25, the bead-shaped compression buffering members 21 can only move longitudinally along the guide rod 25 during the compression, which cannot move transversely. This effectively prevents the compression buffering unit of the coupler buffer from moving transversely while moving longitudinally, and allows the whole coupler buffer to move longitudinally stably, thus effectively protecting the coupler buffer from being damaged.
[0040] For further improving the performance of the compression buffering unit, in this embodiment, a compression reinforcing plate 22 is further provided between two adjacent bead-shaped compression buffering members 21. in addition, for further improving the stability of the compression buffering unit, a surface of the bead-shaped compression buffering member 21 which is in contact with the compression reinforcing plate 22 may be provided with a second positioning groove 24, and the compression reinforcing plate 22 is provided with a second positioning protrusion 25 in cooperation with the second positioning groove 24, as shown in Figure 3. The second positioning groove 24 is an annular groove distributed in a circumferential direction of the bead shaped compression buffering member 21, and correspondingly, the second positioning protrusion 23 is an annular protrusion in cooperation with the annular groove.
[0041] Since the sectional area of the bead-shaped compression buffering member 21 is largest in a middle portion, and the sectional area thereof gradually decreases from the middle portion to two ends thereof, therefore, it has characteristics that an amount of deformation decreases gradually under equal pressure as the amount of compression increases.
[0042] For improving the elastic performance of the whole compression buff unit, the bead-shaped compression buffering member 21 in this embodiment is made of a thermoplastic elastomer. Both of the thermoplastic elastomer and the thermosetting elastomer have excellent buffing performance, which are anti-aging, environmental friendly, recyclable, and can meet the temperature requirement ranging from -50 Celsius degree to 70 Celsius degree, and have excellent adaptability. Apparently, the bead-shaped compression buffering member 21 may also be made of elastic materials such as natural rubber, synthetic rubber, etc.
[0043] The principle and the embodiments of the present application are illustrated herein by specific examples. The above description of examples is only intended to facilitate understanding the method and concept of the present application. It should be noted that, for the person skilled in the art, many modifications and improvements may be made to the present application without departing from the principle of the present application, and these modifications and improvements are also deemed to fall into the protection scope of the present application defined by the claims.
[0044] Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
Claims (9)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:1. A coupler buffer of a railway wagon, comprising a coupler, a coupler yoke which is fixedly connected to the coupler, a traction buffering unit arranged in the coupler yoke and a compression buffering unit connected to a right end of the coupler yoke, wherein the traction buffering unit comprises a plurality of pairs of superimposed traction buffering members, and contact surfaces of the traction buffering members in each pair of traction buffering members are provided with a first positioning groove and a first positioning protrusion cooperated with each other; wherein a traction reinforcing plate is further provided between two adjacent pairs of traction buffering members and is fixedly connected to the two adjacent pairs of traction buffering members, and an edge of the traction reinforcing plate is provided with an edgefold, and when a compression amount of the traction buffering unit reaches a maximum compression amount, adjacent traction reinforcing plates will abut against each other through the edgefold.
- 2. The coupler buffer of the railway wagon according to claim 1, wherein a cross sectional area of the traction buffering member gradually increases from an end, in contact with another traction buffering member, of the traction buffering member to another end of the traction buffering member.
- 3. The coupler buffer of the railway wagon according to claim 1, wherein the traction buffering members in each pair of traction buffering members are each correspondingly provided with a deformable groove at a position in the middle of each of the contact surfaces of the traction buffering members.
- 4. The coupler buffer of the railway wagon according to claim 1, wherein the first positioning protrusion is a conical frustum-shaped positioning protrusion.
- 5. The coupler buffer of the railway wagon according to claim 1, wherein the material of the traction buffering member is a thermosetting elastomer.
- 6. The coupler buffer of the railway wagon according to any one of claims 1 to 5, wherein the compression buffering unit comprises a plurality of bead-shaped compression buffering members sleeved on a guide rod.
- 7. The coupler buffer of the railway wagon according to claim 6, wherein a compression reinforcing plate is provided between any two adjacent bead-shaped compression buffering members.
- 8. The coupler buffer of the railway wagon according to claim 7, wherein a surface of the bead-shaped compression buffering members which is in contact with the compression reinforcing plate is provided with a second positioning groove, and the compression reinforcing plate is provided with a second positioning protrusion cooperated with the second positioning groove.
- 9. The coupler buffer of the railway wagon according to claim 6, the material of the bead-shaped compression buffering members is a thermoplastic elastomer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521115.0 | 2013-10-25 | ||
| CN201310521115.0A CN103523047B (en) | 2013-10-25 | 2013-10-25 | A kind of railway freight-car coupler buffer |
| PCT/CN2014/088547 WO2015058634A1 (en) | 2013-10-25 | 2014-10-14 | Railway freight car car-coupler buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2014339483A1 AU2014339483A1 (en) | 2015-06-18 |
| AU2014339483B2 true AU2014339483B2 (en) | 2016-06-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2014339483A Active AU2014339483B2 (en) | 2013-10-25 | 2014-10-14 | Railway freight car car-coupler buffer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103523047B (en) |
| AU (1) | AU2014339483B2 (en) |
| WO (1) | WO2015058634A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523047B (en) * | 2013-10-25 | 2016-05-11 | 齐齐哈尔轨道交通装备有限责任公司大连研发中心 | A kind of railway freight-car coupler buffer |
| JP6867195B2 (en) * | 2017-03-07 | 2021-04-28 | 川崎重工業株式会社 | Railroad vehicle |
| CN112227860B (en) * | 2020-09-13 | 2022-06-07 | 中国人民解放军海军工程大学 | Double-layer isolation type buffering stop plate mechanism |
| CN112977531A (en) * | 2021-04-07 | 2021-06-18 | 中车齐齐哈尔车辆有限公司 | Buffer device and have its vehicle |
| CN112977529B (en) * | 2021-04-07 | 2022-10-18 | 中车齐齐哈尔车辆有限公司 | Coupler yoke, coupler yoke and vehicle |
| CN113715863B (en) * | 2021-09-09 | 2022-06-28 | 原宇博 | Subway vehicle traction mechanism with buffer mechanism during emergency stop |
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| DE2944669A1 (en) * | 1979-11-06 | 1981-05-14 | Clouth Gummiwerke AG, 5000 Köln | Buffer block with stacked resilient discs - uses discs with interlocking ribs and grooves, also projections forming gaps between discs |
| CN2571635Y (en) * | 2002-09-25 | 2003-09-10 | 西南交通大学 | Rubber buffer for vehicle |
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| NL188186B (en) * | 1953-06-08 | Feinmetall Gmbh | SPRING CONTACT PIN. | |
| IT1165688B (en) * | 1979-06-21 | 1987-04-22 | Riv Officine Di Villar Perosa | SPRING INCLUDING A PLURALITY OF DEFORMABLE ELEMENTS SUITABLE TO SUPPORT AXIAL COMPRESSION LOADS |
| US5351844A (en) * | 1993-06-01 | 1994-10-04 | Miner Enterprises, Inc. | Elastomeric spring unit |
| US6478173B2 (en) * | 2001-02-13 | 2002-11-12 | Miner Enterprises, Inc. | Railroad car draft gear having a long travel |
| CN201027877Y (en) * | 2007-04-18 | 2008-02-27 | 中国南车集团戚墅堰机车车辆工艺研究所 | Rubber buffer |
| CN201842109U (en) * | 2010-10-26 | 2011-05-25 | 青岛四方车辆研究所有限公司 | Elastomer type compact buffer |
| UA65691U (en) * | 2011-05-30 | 2011-12-12 | Андрей Владимирович Сидорчук | Cushioning device apm-120 for rail vehicles |
| CN202669839U (en) * | 2012-06-25 | 2013-01-16 | 南车戚墅堰机车车辆工艺研究所有限公司 | Traction and buffer device |
| CN202987188U (en) * | 2012-12-26 | 2013-06-12 | 中国神华能源股份有限公司 | Car coupler buffer |
| CN103523047B (en) * | 2013-10-25 | 2016-05-11 | 齐齐哈尔轨道交通装备有限责任公司大连研发中心 | A kind of railway freight-car coupler buffer |
-
2013
- 2013-10-25 CN CN201310521115.0A patent/CN103523047B/en active Active
-
2014
- 2014-10-14 AU AU2014339483A patent/AU2014339483B2/en active Active
- 2014-10-14 WO PCT/CN2014/088547 patent/WO2015058634A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2944669A1 (en) * | 1979-11-06 | 1981-05-14 | Clouth Gummiwerke AG, 5000 Köln | Buffer block with stacked resilient discs - uses discs with interlocking ribs and grooves, also projections forming gaps between discs |
| CN2571635Y (en) * | 2002-09-25 | 2003-09-10 | 西南交通大学 | Rubber buffer for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015058634A1 (en) | 2015-04-30 |
| CN103523047A (en) | 2014-01-22 |
| AU2014339483A1 (en) | 2015-06-18 |
| CN103523047B (en) | 2016-05-11 |
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Legal Events
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| FGA | Letters patent sealed or granted (standard patent) | ||
| HB | Alteration of name in register |
Owner name: CRRC QIQIHAR ROLLING STOCK CO., LTD. Free format text: FORMER NAME(S): QIQIHAR RAILWAY ROLLING STOCK CO., LTD; QIQIHAR RAILWAY ROLLING STOCK CO., LTD. DALIAN R&D CENTRE Owner name: CRRC QIQIHAR ROLLING STOCK CO., LTD. DALIAN RESEAR Free format text: FORMER NAME(S): QIQIHAR RAILWAY ROLLING STOCK CO., LTD; QIQIHAR RAILWAY ROLLING STOCK CO., LTD. DALIAN R&D CENTRE |