CN203142688U - Bogie of railway vehicle - Google Patents
Bogie of railway vehicle Download PDFInfo
- Publication number
- CN203142688U CN203142688U CN 201320082611 CN201320082611U CN203142688U CN 203142688 U CN203142688 U CN 203142688U CN 201320082611 CN201320082611 CN 201320082611 CN 201320082611 U CN201320082611 U CN 201320082611U CN 203142688 U CN203142688 U CN 203142688U
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- pull bar
- bogie
- rubber pad
- side frame
- adapter
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Abstract
The utility model relates to a bogie of a railway vehicle. The bogie comprises a first wheel set, a second wheel set, a first side frame and a second side frame installed outside both ends of the first and second wheel sets, as well as a swing bolster, a vibration damper, an adapter, a secondary spring suspension and a constant contact side bearing. The bogie is characterized in that a primary suspension system in two-stage rigidity is installed between a small guide frame at the end of each side frame and the adapter, a first pull rod and a second pull rod are connected between the triangular holes of the first side frame and the second side frame, and the first and second pull rods are intercrossed. The bogie has the advantages that the bogie is simple in structure and convenient to maintain, and strong in adaptability to the twisted line, so that shear deformation on the two side frames of the bogie is constrained elastically, and diamonding deformation is inhibited, therefore, the bogie has a certain capacity of recovering the normal position, and meanwhile, the movement force of a wheeltrack piece is relieved, the radial capacity between the wheeltracks of the bogie, the running speed of the vehicle and the curve passage capacity are enhanced, and the running quality of the vehicle is improved.
Description
Technical field
The utility model relates to a kind of rail vehicle truck, belongs to the rail vehicle truck field.
Background technology
Bogie truck is embodied as row main (smoothly by each curve), carrying (realizing the load-carrying target), traveling (realizing running velocity and riding quality), braking (the being embodied as the row operational vehicle stops) effect of turning to that play in service at rail traffic vehicles in predetermined distance.It is that rail traffic vehicles is realized the heavy duty speed-raising and guaranteed the crucial and basic of vehicle operating quality.
Research points out that the diamond resistant rigidity of bogie truck has controlled effect to the hunting stability of bogie truck, and diamond resistant rigidity is little, two-wheeled is shaken the head and reverse transverse motion in the same way to being easy to generate, bogie truck straight-line motion stability is just poor, the unstability of crawling easily, and reduce vehicle stability.Therefore, the diamond resistant rigidity of raising bogie truck is extremely important.
Current track load carrying vehicle bogie truck is mainly cast steel three-major-items formula bogie truck, and in traditional cast steel three-major-items formula bogie truck, its principal character is that bogie side frame is connected by bogie side frame central authorities square hole with bolster.Bolster left and right side frame is relatively done sink-float, rolling pendulum motion.It is that spring and oblique wedge vibration damper by the bolster two ends retrains that bogie side frame rotates with respect to the level (shaking the head) of bolster, this the way of restraint is very not firm, and abrasion state and geometric configuration that the constraint of diamonding and magnitude of load that spring damper bears, wedge take place between the prevention bolster that it provides and the bogie side frame are relevant.When being in complete vehicle curb condition or wedge severe wear, this constraint is more open.During the bogie truck operation, because front and back wheel produces meeting and shakes the head in the same way and the counter yaw moment serpentine locomotion, with the angular transposition in the same way that makes in the relative bolster occurred level of the left and right side frame plane, namely diamonding takes place in bogie truck " framework ", influence operation stability, increase wheeling edge wearing.Simultaneously, when vehicle when curve moves, be subjected to the influence of bogie side frame " rhombus dislocation ", the critical speed of curve passing through motion also can reduce, aforementioned various adverse consequencess also can be aggravated, the maintenance cost of vehicle is also higher.
Simultaneously, generally can be divided into one again according to spring suspension classification be that spring hangs and two kinds of secondary spring suspensions to cast steel three-major-items formula bogie truck.The spring mounted bogie truck of polyphyly seldom adopts.Because one is that the spring suspension bogie is simple in structure, to be convenient to maintenance, to make, cost is lower, the general roller bearing adapter stabilizer bars that are used for more.The roller bearing adapter stabilizer bar produced of China was all based on this type of bogie truck in the past, and this type of bogie truck can only be complementary with 50 kilometers to 80 kilometers train operation speed per hour per hour, is unfavorable for Speed Increase of Freight Cars; China is passenger and freight car mixed running on same circuit in addition, and the lorry speed per hour lags behind, and has seriously restricted the passenger vehicle operation.And secondary spring suspension bogie structure more complicated, the parts of employing are more, and cost is also higher.Therefore, the general passenger car bogies that are used for of secondary spring suspension bogie more.
By discovering, adopting the crossbar technology is to improve the effective means of cast steel three-major-items formula bogie truck diamond resistant rigidity, can improve the vehicle dynamics performance, effectively improve the running velocity of vehicle, strengthen the diamond resistant rigidity of bogie truck on the common bogie side frame that adopts two bars to be connected bogie truck across of the rod-type bogie truck that intersects.The rod-type bogie truck that intersects can be divided into middle staggered form, following staggered form by the layout of crossbar on bogie truck; The mode of forming by crossbar can be divided into two kinds again, and a kind of is that two crossbar middle parts are fixed mutually, and another kind is that two crossbars do not connect mutually, is two independently connecting rods.8AG is arranged in the China railways lorry principal mode bogie truck at present, change 8G, change 8AB, change 8B, change K2, change K6 type bogie truck and be staggered form structure down, two crossbars are fixed mutually.Changeing K1 type bogie truck is middle staggered form structure, and two crossbars are separate.
The China railways roller bearing adapter stabilizer bar is after adopting the crossbar technology, the lorry running velocity increases substantially, for China's goods transport has been made huge contribution, but because affixed mode is adopted at two crossbar middle parts, caused crossbar in pcketing place, affixed position stress is concentrated, and causes endurance crack easily, brings certain hidden danger safely for vehicle operating.
For changeing K1 type bogie truck, to intersect by two strut bars and pass bolster belly preformed hole, strut bar two ends and side frames flexibly are connected as a single entity; The bogie side frame two ends are supported on wheel to last by resilient rubbber cushion and adapter.Except preventing that side frames from taking place " rhombus dislocation " bogie truck is operated steadily, reduce wheel-rail wear, improve the vertical and horizontal tractive performance of vehicle, improve curving performance and bogie truck hunting critical speed, reduce the abrasion between the wheel track.
But above-mentioned bogie truck is not still fully optimized from spring suspension and pull bar elastic element, so improving anti-water chestnut property, still there are some limitation in aspects such as the radially carrying capacity when the low power of optimization bogie truck and curve motion, elastic element reliability, performance still can not satisfy best requirement, is necessary this is further improved.
Summary of the invention
The purpose of this utility model is the deficiency at existing railway goods train bogie, provide a kind of simple in structure, economical and practical, have the rail vehicle truck of the radially ability when improving spring suspension system, higher diamond resistant rigidity, shear stiffness and excellent operation stability and curve motion.
In order to realize this purpose, the utility model provides a kind of rail vehicle truck, comprise that the first round is right, second take turns right, be installed in first and second first bogie side frame and second bogie side frames of taking turns the outside, two ends, and bolster, shock attenuation unit, adapter, secondary spring hangs, normal contact side bearing, the secondary spring suspension that is made of the outer coil spring of coil spring in the central authorities and central authorities is placed on the side frames, bolster is placed in secondary spring by shock attenuation unit and hangs, between each little drawing strickle guide in bogie side frame end and adapter, two stage stiffness single stage suspension system is housed, between the delthyrium of first bogie side frame and second bogie side frame, be connected with first pull bar and second pull bar, and first pull bar and second pull bar intersect mutually;
Described single stage suspension system is the journal box spring device of two stage stiffness, shear rubber pad and form by bearing plate, shear plate, base plate, pressure-bearing rubber pad, the first shearing rubber pad, second, first, second is sheared rubber pad and becomes the obtuse angle with the pressure-bearing rubber pad, and the two ends that are connected the pressure-bearing rubber pad of symmetry constitute elastic body, top at the pressure-bearing rubber pad is provided with bearing plate, be respectively equipped with shear plate on first and second tops of shearing rubber pad, base plate is located at elastomeric bottom, is equipped with positioning at first and second shear plates of shearing the top of rubber pad.Wherein the pressure-bearing rubber pad is captiveed joint with bogie side frame, adapter by locating dowel pin, and it is fixed with bogie side frame by the location retaining that first, second shears rubber pad.
Described bearing plate, shear plate, base plate and pressure-bearing rubber pad, first are sheared rubber pad, the second shearing rubber pad is sulfided into one.
Described first pull bar and second pull bar constitute by shaft and the mounting hole that is located at the shaft two ends, are provided with mider hole at the shaft middle part of second pull bar, and first pull bar passes from the mider hole of second pull bar and forms cross one another pull bar group structure; The pull bar group is installed between the delthyrium of first, second bogie side frame, and in the scope of side frames delthyrium, the end mounting hole of two pull bars connects as one with side frames elasticity by the ball pivot cover the horizontal centre plane of pull bar group in the pull bar group apart from the rail level eminence.
The shaft section of described first pull bar and second pull bar is rectangular configuration, and is heavy according to bogie axle, distance between journal centers is different with pull bar length, and the rational aspect ratio of rectangular cross section is 1:1.65～2.0.
In the described pull bar group end mounting hole of two pull bars and side frames by following structural elasticity connect as one: the longitudinal center delthyrium place at described first, second bogie side frame all is cast with Connection Block, fixed adapter shaft on the Connection Block; Two pull bars are installed on the described adapter shaft by mounting hole in the pull bar group, are pressed with elasticity hinge cover between mounting hole and adapter shaft, end ear pad sheet, retaining washer, binding bolt.
Described adapter shaft is the cylindricality adapter shaft, and described elasticity hinge cover is the integral type elastic ball joint that is complementary with adapter shaft.The difference of height of side frames when this structure can make pull bar can adapt to bogie truck by curve is better avoided being conducive to the safety of vehicle operating because pull bar Do strength causes inside and outside wheel off-load.
Rail vehicle truck of the present utility model, wherein adapter shaft is for directly to be cemented on the Connection Block at bogie side frame delthyrium place, and consolidation style can be that welding, riveted joint or bolt and nut connect.This structure can adopt the scheme of more suitably assembling at different structure spaces.
The utility model has the advantages that: this rail vehicle truck is by installing pull bar and the axle box spring installation being installed between the little drawing strickle guide in bogie side frame end and adapter between the bogie side frame delthyrium, it is simple in structure not only to have inherited traditional cast steel three-major-items formula roller bearing adapter stabilizer bar, easy to maintenance, to the strong characteristics of distortion network adaptability, make the shear deformation of bogie truck side frames be subjected to elastic restraint again, diamonding is suppressed, make bogie truck have the ability of certain answer normotopia, alleviated the action of wheel track spare simultaneously firmly, improve between the bogie truck wheel track radially ability and running velocity and curve negotiation ability, improved the vehicle operating quality.
Description of drawings
Fig. 1 is that the master according to rail vehicle truck of the present utility model looks scheme drawing;
Fig. 2 is the schematic side view of Fig. 1;
Fig. 3 is the schematic top plan view of Fig. 1;
Fig. 4 is single stage suspension of the present utility model system scheme of installation;
Fig. 5 is the structural representation of journal box spring device of the present utility model (single stage suspension system);
Fig. 6 is the birds-eye view of Fig. 5;
Fig. 7 is the structural representation of first pull bar;
Fig. 8 is the birds-eye view of Fig. 7;
Fig. 9 is the structural representation of second pull bar;
Figure 10 is the structural representation in elastic ball joint;
Figure 11, Figure 12 are the mounting structure scheme drawings of two kinds of structures in pull bar, adapter shaft and elastic ball joint;
Figure 13 a, Figure 13 b, Figure 13 c are the several with reference to the mount scheme scheme drawing of the adapter shaft of rail vehicle truck of the present utility model and bogie side frame Connection Block;
Figure 14 a, Figure 14 b, Figure 14 c are several reference configuration scheme drawings of the adapter shaft of rail vehicle truck of the present utility model;
Figure 15 is that rail vehicle truck of the present utility model is being installed under pull bar group and the single stage suspension system, and the wheel during by curve aligns potential energy power and anti-water chestnut ability schematic diagram.
The specific embodiment
Below with reference to accompanying drawings, in conjunction with the embodiments the utility model is further described.
As Fig. 1, Fig. 2, shown in Figure 3, rail vehicle truck of the present utility model comprises: the first round is to 1, second taking turns 13, being installed in first and second first bogie side frame 2 and second bogie side frames 14 of taking turns the outside, two ends, and bolster 4, shock attenuation unit 3, adapter 8, secondary spring hang, often contact side bearing 9, the secondary spring suspension that is made of the outer coil spring 6 of coil spring 5 in the central authorities and central authorities is placed on the side frames 2,14, constitutes a kind of suspended structure.Bolster 4 is placed in secondary spring by shock attenuation unit 3 and hangs, and between each little drawing strickle guide in bogie side frame end and adapter two stage stiffness single stage suspension system is housed, and constitutes another kind of suspended structure.Provide wheel to required in length and breadth to the elasticity locating stiffness, reduce unsprung weight, improve the Vehicular vibration performance, reduce between the wheel track action firmly; Between the delthyrium of first bogie side frame and second bogie side frame, be elasticly connected with first pull bar 10 and second pull bar 11, and first pull bar and second pull bar intersect mutually.
As shown in Figure 4, setting up one between bogie side frame 2 and adapter 8 is journal box spring device 7.Adapter 8 is placed in wheel on 1.
As Fig. 5, shown in 6, single stage suspension of the present utility model system is the journal box spring device 7 of two stage stiffness, be by bearing plate 36, shear plate 37, base plate 35, pressure-bearing rubber pad 32, first shears rubber pad 31, second shears the elastic caoutchouc hardware that rubber pad 34 is formed, first, second shears rubber pad becomes the obtuse angle with the pressure-bearing rubber pad, and the two ends that are connected the pressure-bearing rubber pad of symmetry constitute elastic body, be provided with bearing plate 36 on the top of pressure-bearing rubber pad, be respectively equipped with shear plate 37 on first and second tops of shearing rubber pad, base plate 35 is located at elastomeric bottom, bearing plate, shear plate, base plate and pressure-bearing rubber pad, first shears rubber pad, second shears rubber pad is sulfided into one.Be equipped with positioning 30 at first and second shear plates of shearing the top of rubber pad.Wherein the pressure-bearing rubber pad is captiveed joint with bogie side frame, adapter by locating dowel pin 33, with the transverse and longitudinal displacement after limiting it and assembling; It is fixed with bogie side frame by the location retaining that first, second shears rubber pad, to limit its rotation.It is more reliable that this structure makes that bogie side frame, adapter, single stage suspension device cooperate, and making it two is that the effect of rigidity is not fully exerted.Its elasticity location is realized by pressure-bearing rubber pad and shearing rubber pad in the axle box location of rail vehicle truck, forms the single stage suspension system.This structure can satisfy the empty wagons different demands big with the loaded vehicle difference in quality, under the different operating modes with loaded vehicle of empty wagons, provides different horizontal strokes, vertical and vertical stiffness as required.
The secondary spring that the outer coil spring 6 of coil spring 5 and central authorities constitutes in the central authorities of the present utility model hangs and is placed on the bogie side frame 2, constitutes a kind of suspended structure.Between bogie side frame 2 and adapter 8, set up two stage stiffness journal box spring device 7, constitute another kind of suspended structure.By this dual mode, form the two stage suspension bogie structure, can satisfy the demand of the various operating modes of vehicle.Simultaneously be provided with pull bar 10,11 between bogie side frame 2,14, first bogie side frame 2, second bogie side frame 14 are flexibly connected as one, the anti-water chestnut of improving first bogie side frame 2, second bogie side frame 14 becomes ability.
Shown in Fig. 1,2,3,7,8,9, between side frames 2,14, be provided with the pull bar group that is constituted by first pull bar 10 and second pull bar 11, this pull bar group is two one group digonal link, first pull bar and second pull bar constitute by shaft and the mounting hole that is located at the shaft two ends, shaft middle part at second pull bar is provided with mider hole 26, first pull bar 10 passes second pull bar, 11 mider holes 26, forms mutual decussate texture.Be convenient and install and safeguard that avoid colliding with, two digonal links are installed between the side frames longitudinal median plane in operation and allocation and transportation process, the horizontal centre plane of its pull bar group apart from the rail level eminence in the scope of bogie side frame delthyrium.Pull bar 10,11 sections are rectangular cross section, and for obtaining the effect of best bending strength and anti-water chestnut, its section aspect ratio is 1:1.65 ~ 2.0.
Shown in Fig. 2,6,8,9,11,12, bolster 4 bellies are provided with preformed hole 21A, 21B, and first pull bar 10, second pull bar 11 pass wherein.The longitudinal center delthyrium place of bogie side frame 2 is cast with Connection Block 12, affixed adapter shaft 23 on the Connection Block 12, and adapter shaft top is drilled with tapped bore; The mounting plane of adapter shaft is positioned near the bogie truck horizontal central plane, so that two pull bars 10,11 horizontal centre plane are near the bogie truck horizontal central plane; The two ends of two pull bars are provided with mounting hole, for ease of assembling, realize that two digonal links intersect mutually, first pull bar, 10 1 end mounting hole thickness are identical with pull bar shaft cross section, other end mounting hole thickness is identical with the mounting hole thickness of second pull bar 11, and each mounting hole can be socketed on the adapter shaft 23; During installation, make two pull bars 10,11 intersections pass preformed hole 21 A, 21 B of bolster 4 bellies, and the mounting hole that makes first pull bar, 10 1 ends and shaft cross section same thickness is socketed on the adapter shaft 23 that is pressed with elastic ball joint 15 and stop collar 24, place back-up ring 19, end aural grommet 18, retaining washer 17, binding bolt 16 then; All the other thickness pull bar mounting holes are socketed on the adapter shaft 23 that is pressed with elastic ball joint 15, place back-up ring 20, end aural grommet 18, retaining washer 17, binding bolt 16 then, thereby pull bar 10,11 and first bogie side frame 2, second bogie side frame 14 are flexibly connected as one.
Shown in Figure 14 a, 14b, 14c, adapter shaft 23 can select to illustrate a kind of in three kinds of organization plans.Be depicted as bolt as Figure 14 a, Figure 13 a and connect, namely adapter shaft 23 is cemented on the Connection Block 12 by bolt 22.Figure 14 b, Figure 13 b are depicted as riveted joint, and adapter shaft 23 is cemented on the Connection Block 12 by rivet 25.It is fixed that Figure 14 c, Figure 13 c are depicted as welding, and adapter shaft 13 directly is welded on the Connection Block 12.
As shown in figure 10, elastic ball joint 15 is complementary with adapter shaft 13.Elastic ball joint 15 by overlap 28 in the ball core steel, tubular steel overcoat 27 and rubber 29 forms one by sulfuration.
As shown in figure 15, with the journal box spring device of single stage suspension system be reduced to three-dimensional spring 38, the first pull bars 10, second pull bar 11 is reduced to pull rod device 39, secondary spring hangs and is reduced to spring installation 40.When bogie truck passes through curve, under three-dimensional spring 38, pull rod device 39, spring installation 40 effects, provided wheel to enough normotopia abilities, eliminate attack angle alpha between the wheel track, make the shear deformation of bogie truck side frames be subjected to elastic restraint, diamonding is suppressed, make bogie truck have the ability of certain answer normotopia, alleviated simultaneously between wheel track action firmly, improve between the bogie truck wheel track radially ability and running velocity and curve negotiation ability, improve the vehicle operating quality.
Claims (6)
1. rail vehicle truck, comprise that the first round is right, second take turns right, be installed in first and second first bogie side frame and second bogie side frames of taking turns the outside, two ends, and bolster, shock attenuation unit, adapter, secondary spring hangs, normal contact side bearing, the secondary spring suspension that is made of the outer coil spring of coil spring in the central authorities and central authorities is placed on the side frames, bolster is placed in secondary spring by shock attenuation unit and hangs, it is characterized in that: between each little drawing strickle guide in bogie side frame end and adapter, two stage stiffness single stage suspension system is housed, between the delthyrium of first bogie side frame and second bogie side frame, be connected with first pull bar and second pull bar, and first pull bar and second pull bar intersect mutually; Described single stage suspension system is the journal box spring device of two stage stiffness, by bearing plate, shear plate, base plate, the pressure-bearing rubber pad, first shears rubber pad, second shears rubber pad forms, first, second shears rubber pad becomes the obtuse angle with the pressure-bearing rubber pad, and the two ends that are connected the pressure-bearing rubber pad of symmetry constitute elastic body, top at the pressure-bearing rubber pad is provided with bearing plate, be respectively equipped with shear plate on first and second tops of shearing rubber pad, base plate is located at elastomeric bottom, be equipped with positioning at first and second shear plates of shearing the top of rubber pad, wherein the pressure-bearing rubber pad is by locating dowel pin and bogie side frame, the adapter captive joint, first, second shears rubber pad keeps off with bogie side frame fixed by the location.
2. rail vehicle truck according to claim 1 is characterized in that: described bearing plate, shear plate, base plate and pressure-bearing rubber pad, first are sheared rubber pad, second and are sheared rubber pad and be sulfided into one.
3. rail vehicle truck according to claim 1, it is characterized in that: described first pull bar and second pull bar constitute by shaft and the mounting hole that is located at the shaft two ends, shaft middle part at second pull bar is provided with mider hole, and first pull bar passes from the mider hole of second pull bar and forms cross one another pull bar group structure; The pull bar group is installed between the delthyrium of first, second bogie side frame, and in the scope of side frames delthyrium, the end mounting hole of two pull bars connects as one with side frames elasticity by the ball pivot cover the horizontal centre plane of pull bar group in the pull bar group apart from the rail level eminence.
4. rail vehicle truck according to claim 3, it is characterized in that: the shaft section of described first pull bar and second pull bar is rectangular configuration, and the rational aspect ratio of rectangular cross section is 1:1.65～2.0.
5. according to claim 3 or 4 described rail vehicle trucks, it is characterized in that: in the described pull bar group end mounting hole of two pull bars and side frames by following structural elasticity connect as one: the longitudinal center delthyrium place at described first, second bogie side frame all is cast with Connection Block, fixed adapter shaft on the Connection Block; Two pull bars are installed on the described adapter shaft by mounting hole in the pull bar group, are pressed with elasticity hinge cover between mounting hole and adapter shaft, end ear pad sheet, retaining washer, binding bolt.
6. rail vehicle truck according to claim 5, it is characterized in that: described adapter shaft is the cylindricality adapter shaft, described elasticity hinge cover is the integral type elastic ball joint that is complementary with adapter shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082611 CN203142688U (en) | 2013-02-22 | 2013-02-22 | Bogie of railway vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082611 CN203142688U (en) | 2013-02-22 | 2013-02-22 | Bogie of railway vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203142688U true CN203142688U (en) | 2013-08-21 |
Family
ID=48970236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320082611 Withdrawn - After Issue CN203142688U (en) | 2013-02-22 | 2013-02-22 | Bogie of railway vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203142688U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103112466A (en) * | 2013-02-22 | 2013-05-22 | 包头北方创业股份有限公司 | Railway vehicle bogie |
| CN103612645A (en) * | 2013-11-27 | 2014-03-05 | 齐齐哈尔轨道交通装备有限责任公司 | Swing bolster, swing bolster vibration reduction assembly and bogie |
-
2013
- 2013-02-22 CN CN 201320082611 patent/CN203142688U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103112466A (en) * | 2013-02-22 | 2013-05-22 | 包头北方创业股份有限公司 | Railway vehicle bogie |
| CN103112466B (en) * | 2013-02-22 | 2015-11-18 | 包头北方创业股份有限公司 | Rail vehicle truck |
| CN103612645A (en) * | 2013-11-27 | 2014-03-05 | 齐齐哈尔轨道交通装备有限责任公司 | Swing bolster, swing bolster vibration reduction assembly and bogie |
| CN103612645B (en) * | 2013-11-27 | 2016-04-06 | 齐齐哈尔轨道交通装备有限责任公司 | Bolster, bolster damping assembly and bogie truck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130821 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |