CN105171687A - Disassembling tool and disassembling method for bevel gear component bearing - Google Patents
Disassembling tool and disassembling method for bevel gear component bearing Download PDFInfo
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- CN105171687A CN105171687A CN201510648567.4A CN201510648567A CN105171687A CN 105171687 A CN105171687 A CN 105171687A CN 201510648567 A CN201510648567 A CN 201510648567A CN 105171687 A CN105171687 A CN 105171687A
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- diameter
- bevel gear
- hook
- gear component
- hole
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 abstract 5
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/06—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races
- B25B27/062—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races using screws
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
The invention discloses a disassembling tool and disassembling method for a bevel gear component bearing. According to the disassembling tool, the separable combination principle, namely all components are linked with one another, is adopted for design. The disassembling tool comprises a falcula, a lower supporting plate, a reinforcing ring, pull rods, an upper supporting plate, a press block and a threaded rod. During disassembly, firstly, the reinforcing ring is lifted to a certain height and rotated in the axial direction until the reinforcing ring is suspended in annular grooves in the pull rods; secondly, the falcula is pulled outwards until the falcula can not be pulled outwards anymore; thirdly, the disassembling tool is pick up at the moment, the press block is supported and abutted against the small end face of the upper portion of a bevel gear shaft, and then the falcula is slid to the center until the falcula is attached to the lower supporting plate, inserted into a disassembling notch and attached to the bottom surface of the bearing; and finally the reinforcing ring is rotated in the opposite direction and dropped down at the same time, the falcula is sleeved with the reinforcing ring, the outer circle of the falcula is hooped, and the bearing is disassembled gradually by rotating the threaded rod at the moment. The disassembling tool is convenient to operate and fast and saves labor, and referential experiences are provided for similar problems.
Description
Technical field
The invention belongs to mounting technology, relate to a kind of bevel gear component bearing disassembling tool and decomposition method.
Background technology
Engine assembly debugging and overhaul process in, the bearing be arranged on gear axle journal needs repeatedly to load and unload, and is interference fit between bearing inner race and axle.Axle journal there is reserved decomposition space, normal conditions bearing lower surface is higher than gear upper surface, forked type disassembling tool is utilized to carry out bearing decomposition, the U-shaped support plate be arranged on connecting plate is inserted in the reserved decomposition space on axle journal, and rest on bearing inner race, again the briquetting being arranged on screw head is withstood on gear shaft end face, implement to decompose by the screw rod being rotatably installed in connecting plate center.Certain bevel gear component is made up of bevel gear 1 and bearing 2, and as shown in Figure 1, reserved decomposition radial dimension width A, reserved decomposition axial dimension L, because the bearing that will decompose is embedded in bottom bevel gear, traditional forked type disassembling tool cannot be implemented bearing and decompose.
Summary of the invention
For solving the difficult problem that bevel gear component bearing decomposes, the present invention proposes a kind of bevel gear component bearing disassembling tool and decomposition method.
Technical scheme of the present invention is:
Described a kind of bevel gear component bearing disassembling tool, is characterized in that: comprise hook, lower carrier plate, stiffening ring, pull bar, upper supporting plate, briquetting and screw rod;
Described hook is step secter pat structure; Lower floor bench floor thickness H1 is less than the reserved decomposition axial dimension L of bevel gear component, the distance L1 of lower floor's bench floor front end and hook central axis is greater than the reserved decomposition radial dimension width A of bevel gear component, and being less than the half of bevel gear component bearing outside diameter D, lower floor step side internal diameter D1 is greater than bevel gear component bearing outside diameter D; Upper strata bench floor has gain, and gain direction is parallel to the hook plane of symmetry, and gain length meets hook lower floor bench floor and inserts and depart from the requirement of bevel gear component axle journal breach;
Described lower carrier plate is annulus plate, lower carrier plate has two class connecting thread holes; One class connecting thread hole Ma is used for being connected with the stepped screw through gain, stepped screw and gain matched in clearance, and is axially connected with lower carrier plate by hook; Another kind of connecting thread hole Mb is used for being connected with pull bar threaded one end; Lower carrier plate outer diameter D 4 coordinates with hook upper strata step side internal diameter D2;
Described stiffening ring is the disc structure of one end with counterbore, and counterbore internal diameter D5 coordinates with hook upper strata step side outer diameter D 3; Center, stiffening ring other end has through hole, central through hole periphery has profiled holes, described profiled holes is made up of the circular hole of waist type groove and waist type groove one end, circular hole aperture Dk is greater than waist type groove groove width B, and the radial distance at profiled holes and stiffening ring center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center;
Described upper supporting plate is the plate profile structure with center tapped through hole; Upper supporting plate also has the connecting hole be connected with the pull bar other end, the radial distance at connecting hole and upper supporting plate center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center;
Described pull bar is the screwed multidiameters in two ends; Pull bar threaded one end Mc coordinates with lower carrier plate connecting thread hole Mb; The cylindrical section of diameter D7 is adjacent with screw thread Mc; Diameter D7 is greater than screw thread Mc external diameter, and the cylindrical section of diameter D7 can with the circular hole matched in clearance of profiled holes one end, diameter D7 is greater than groove width B; Have the cylindrical section of diameter D8 in the middle part of the cylindrical section of diameter D7, diameter D8 is less than diameter D7, the cylindrical section of diameter D8 can with the waist type groove matched in clearance of profiled holes; The cylindrical section of diameter D6 is adjacent with the cylindrical section of diameter D7, the cylindrical section of pull bar other end screw thread Md and diameter D6 is adjacent, diameter D6 is less than diameter D7, and the cylindrical section of diameter D6 coordinates with the connecting hole of upper supporting plate, and is connected with upper supporting plate by pull bar with nut by screw thread Md;
Described briquetting is for being supported on the axial end of bevel gear component;
Described screw rod is threaded with upper supporting plate center tapped through hole.
Describedly a kind ofly utilize above-mentioned bevel gear component bearing disassembling tool to carry out the method for decomposing, it is characterized in that: comprise the following steps:
Step 1: stiffening ring is lifted certain altitude, and around axial-rotation, make the cylindrical section matched in clearance of diameter D8 on stiffening ring profiled holes waist type groove and pull bar;
Step 2: pull out hook along gain, to stepped screw and gain end thereof contacts;
Step 3: briquetting is supported in the axial end of bevel gear component, and screw rod end is connected with briquetting;
Step 4: inwardly promote hook along gain, makes hook lower floor bench floor insert bevel gear component axle journal breach, fits to hook upper strata step medial surface and lower carrier plate;
Step 5: axial-rotation stiffening ring, the circular hole of stiffening ring profiled holes one end is coordinated with pull bar, and stiffening ring falls, and stiffening ring counterbore inner surface wales hook upper strata step lateral surface;
Step 6: rotary screw, decomposes bevel gear component bearing.
Beneficial effect
Device of the present invention is adopted to solve a difficult problem for bevel gear component bearing decomposition.And tool operation is convenient, convenient power-saving, for Similar Problems provides can experience for reference.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1: disassembling tool schematic diagram;
Fig. 2: hook schematic diagram;
Fig. 3: lower carrier plate schematic diagram;
Fig. 4: stiffening ring schematic diagram;
Fig. 5: pull bar schematic diagram;
Fig. 6: upper supporting plate schematic diagram.
Wherein: 1, bevel gear; 2, bearing; 3, hook; 4, lower carrier plate; 5, stiffening ring; 6, pull bar; 7, upper supporting plate; 8, briquetting; 9, screw rod.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Therefore, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
What the present embodiment adopted is Split assembled, the principle design bevel gear component bearing disassembling tool that ring ring is nested, as shown in Figure 1, disassembling tool is primarily of hook 3, lower carrier plate 4, stiffening ring 5, pull bar 6, upper supporting plate 7, briquetting 8, screw rod 9 and nut and stepped screw composition.
Described hook has two, as shown in Figure 2, is step secter pat structure.Lower floor bench floor thickness H1 0.3 ~ 0.5mm less of the reserved decomposition axial dimension L of bevel gear component, lower floor's bench floor front end 0.4 ~ 0.5mm larger than the reserved decomposition radial dimension width A of bevel gear component with the distance L1 of hook central axis, and be less than the half of bevel gear component bearing outside diameter D, lower floor step side internal diameter D1 3 ~ 4mm larger than bevel gear component bearing outside diameter D.Upper strata bench floor has gain, for stepped screw column part matched in clearance, gap is 0.1 ~ 0.2mm; Gain direction is parallel to the hook plane of symmetry, and gain length L2 meets hook lower floor bench floor and inserts and depart from the requirement of bevel gear component axle journal breach, and makes the distance of lower floor's bench floor front end outside mobile 2-3mm again after departing from bearing outer ring.
As shown in Figure 3, described lower carrier plate is annulus plate, lower carrier plate has two class connecting thread holes; One class connecting thread hole Ma is used for being connected with the stepped screw through gain, stepped screw and gain matched in clearance, and is axially connected with lower carrier plate by hook, and enables hook along the directed small―gap suture slippage of gain; Another kind of connecting thread hole Mb is used for being connected with pull bar threaded one end; Lower carrier plate outer diameter D 4 is that H7/f7 coordinates with hook upper strata step side internal diameter D2.
As shown in Figure 4, described stiffening ring is the disc structure of one end with counterbore, and counterbore internal diameter D5 is with hook upper strata step side outer diameter D 3 for H7/f7 coordinates, and counterbore depth H 3 is consistent with hook upper strata shoulder height H2.Center, stiffening ring other end has through hole, central through hole periphery has profiled holes, described profiled holes is made up of the circular hole of waist type groove and waist type groove one end, circular hole aperture Dk is greater than waist type groove groove width B, and the radial distance at profiled holes and stiffening ring center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center.
As shown in Figure 6, described upper supporting plate is the plate profile structure with center tapped through hole; Upper supporting plate also has the connecting hole be connected with the pull bar other end, the radial distance at connecting hole and upper supporting plate center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center.
As shown in Figure 5, described pull bar is the screwed multidiameters in two ends; Pull bar threaded one end Mc coordinates with lower carrier plate connecting thread hole Mb; The cylindrical section of diameter D7 is adjacent with screw thread Mc; Diameter D7 is greater than screw thread Mc external diameter, and the cylindrical section of diameter D7 can with the circular hole matched in clearance of profiled holes one end, gap is 0.3 ~ 0.4mm, and diameter D7 is greater than groove width B; Have the cylindrical section of diameter D8 in the middle part of the cylindrical section of diameter D7, diameter D8 is less than diameter D7, the cylindrical section of diameter D8 can with the waist type groove matched in clearance of profiled holes, gap is 0.3 ~ 0.4mm; The cylindrical section of diameter D6 is adjacent with the cylindrical section of diameter D7, the cylindrical section of pull bar other end screw thread Md and diameter D6 is adjacent, diameter D6 is less than diameter D7, the cylindrical section of diameter D6 and the connecting hole matched in clearance of upper supporting plate, gap is 0.3 ~ 0.4mm, and be connected with upper supporting plate by pull bar with nut by screw thread Md, thus hook, lower carrier plate, stiffening ring, pull bar, upper supporting plate are assembled into a structure.
As shown in Figure 1, briquetting is for being supported on the axial end of bevel gear component; And screw rod is threaded with upper supporting plate center tapped through hole.
In the present embodiment, bevel gear component bearing parameter A=18mm, L=4mm, external diameter
instrument key dimension:
1) hook:
H2＝30mm；
2) lower carrier plate:
ma=M8; Mb=M12;
3) stiffening ring:
h3=H2=30mm;
4) pull bar: Md=M10;
mc=M12;
5) upper supporting plate:
me=M16.
Employing said apparatus to the method that bevel gear component bearing decomposes is:
Step 1: stiffening ring is lifted certain altitude, and around axial-rotation, make the cylindrical section matched in clearance of diameter D8 on stiffening ring profiled holes waist type groove and pull bar;
Step 2: pull out hook along gain, to stepped screw and gain end thereof contacts, draw motionless till;
Step 3: briquetting is supported in the axial end of bevel gear component, and screw rod end is connected with briquetting;
Step 4: inwardly promote hook along gain, makes hook lower floor bench floor insert bevel gear component axle journal breach, fits to hook upper strata step medial surface and lower carrier plate;
Step 5: axial-rotation stiffening ring, the circular hole of stiffening ring profiled holes one end is coordinated with pull bar, and stiffening ring falls, and stiffening ring counterbore inner surface wales hook upper strata step lateral surface;
Step 6: rotary screw, decomposes bevel gear component bearing.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.
Claims (2)
1. a bevel gear component bearing disassembling tool, is characterized in that: comprise hook, lower carrier plate, stiffening ring, pull bar, upper supporting plate, briquetting and screw rod;
Described hook is step secter pat structure; Lower floor bench floor thickness H1 is less than the reserved decomposition axial dimension L of bevel gear component, the distance L1 of lower floor's bench floor front end and hook central axis is greater than the reserved decomposition radial dimension width A of bevel gear component, and being less than the half of bevel gear component bearing outside diameter D, lower floor step side internal diameter D1 is greater than bevel gear component bearing outside diameter D; Upper strata bench floor has gain, and gain direction is parallel to the hook plane of symmetry, and gain length meets hook lower floor bench floor and inserts and depart from the requirement of bevel gear component axle journal breach;
Described lower carrier plate is annulus plate, lower carrier plate has two class connecting thread holes; One class connecting thread hole Ma is used for being connected with the stepped screw through gain, stepped screw and gain matched in clearance, and is axially connected with lower carrier plate by hook; Another kind of connecting thread hole Mb is used for being connected with pull bar threaded one end; Lower carrier plate outer diameter D 4 coordinates with hook upper strata step side internal diameter D2;
Described stiffening ring is the disc structure of one end with counterbore, and counterbore internal diameter D5 coordinates with hook upper strata step side outer diameter D 3; Center, stiffening ring other end has through hole, central through hole periphery has profiled holes, described profiled holes is made up of the circular hole of waist type groove and waist type groove one end, circular hole aperture Dk is greater than waist type groove groove width B, and the radial distance at profiled holes and stiffening ring center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center;
Described upper supporting plate is the plate profile structure with center tapped through hole; Upper supporting plate also has the connecting hole be connected with the pull bar other end, the radial distance at connecting hole and upper supporting plate center equals the radial distance at connecting thread hole Mb on lower carrier plate and lower carrier plate center;
Described pull bar is the screwed multidiameters in two ends; Pull bar threaded one end Mc coordinates with lower carrier plate connecting thread hole Mb; The cylindrical section of diameter D7 is adjacent with screw thread Mc; Diameter D7 is greater than screw thread Mc external diameter, and the cylindrical section of diameter D7 can with the circular hole matched in clearance of profiled holes one end, diameter D7 is greater than groove width B; Have the cylindrical section of diameter D8 in the middle part of the cylindrical section of diameter D7, diameter D8 is less than diameter D7, the cylindrical section of diameter D8 can with the waist type groove matched in clearance of profiled holes; The cylindrical section of diameter D6 is adjacent with the cylindrical section of diameter D7, the cylindrical section of pull bar other end screw thread Md and diameter D6 is adjacent, diameter D6 is less than diameter D7, and the cylindrical section of diameter D6 coordinates with the connecting hole of upper supporting plate, and is connected with upper supporting plate by pull bar with nut by screw thread Md;
Described briquetting is for being supported on the axial end of bevel gear component;
Described screw rod is threaded with upper supporting plate center tapped through hole.
2. utilize above-mentioned instrument to carry out a method for bevel gear component bearing decomposition, it is characterized in that: comprise the following steps:
Step 1: stiffening ring is lifted certain altitude, and around axial-rotation, make the cylindrical section matched in clearance of diameter D8 on stiffening ring profiled holes waist type groove and pull bar;
Step 2: pull out hook along gain, to stepped screw and gain end thereof contacts;
Step 3: briquetting is supported in the axial end of bevel gear component, and screw rod end is connected with briquetting;
Step 4: inwardly promote hook along gain, makes hook lower floor bench floor insert bevel gear component axle journal breach, fits to hook upper strata step medial surface and lower carrier plate;
Step 5: axial-rotation stiffening ring, the circular hole of stiffening ring profiled holes one end is coordinated with pull bar, and stiffening ring falls, and stiffening ring counterbore inner surface wales hook upper strata step lateral surface;
Step 6: rotary screw, decomposes bevel gear component bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510648567.4A CN105171687B (en) | 2015-10-09 | 2015-10-09 | Disassembling tool and disassembling method for bevel gear component bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510648567.4A CN105171687B (en) | 2015-10-09 | 2015-10-09 | Disassembling tool and disassembling method for bevel gear component bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105171687A true CN105171687A (en) | 2015-12-23 |
| CN105171687B CN105171687B (en) | 2017-01-18 |
Family
ID=54894355
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510648567.4A Active CN105171687B (en) | 2015-10-09 | 2015-10-09 | Disassembling tool and disassembling method for bevel gear component bearing |
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| CN (1) | CN105171687B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105751153A (en) * | 2016-04-22 | 2016-07-13 | 广州飞机维修工程有限公司 | Dismounting device for double shaft sleeves of civil aircraft oil combustion part |
| CN113427432A (en) * | 2020-03-23 | 2021-09-24 | 中国航发商用航空发动机有限责任公司 | Balance shaft sleeve disassembling assembly and disassembling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2287767A (en) * | 1940-03-25 | 1942-06-30 | New Process Gear Corp | Bearing setting instrument |
| DE10135668B4 (en) * | 2001-07-21 | 2004-12-09 | Krumm Kg | Puller for pulling ball bearings or the like from a shaft |
| CN201455903U (en) * | 2009-08-21 | 2010-05-12 | 南车戚墅堰机车车辆工艺研究所有限公司 | Dismounting tool for bearing outer ring |
| US20120036690A1 (en) * | 2010-08-12 | 2012-02-16 | Mueller-Kueps, L.P. | Dismounting device for bearings |
| CN102922480A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Disassembly tool special for pinion on horizontal shaft of cone crusher |
-
2015
- 2015-10-09 CN CN201510648567.4A patent/CN105171687B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2287767A (en) * | 1940-03-25 | 1942-06-30 | New Process Gear Corp | Bearing setting instrument |
| DE10135668B4 (en) * | 2001-07-21 | 2004-12-09 | Krumm Kg | Puller for pulling ball bearings or the like from a shaft |
| CN201455903U (en) * | 2009-08-21 | 2010-05-12 | 南车戚墅堰机车车辆工艺研究所有限公司 | Dismounting tool for bearing outer ring |
| US20120036690A1 (en) * | 2010-08-12 | 2012-02-16 | Mueller-Kueps, L.P. | Dismounting device for bearings |
| CN102922480A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Disassembly tool special for pinion on horizontal shaft of cone crusher |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105751153A (en) * | 2016-04-22 | 2016-07-13 | 广州飞机维修工程有限公司 | Dismounting device for double shaft sleeves of civil aircraft oil combustion part |
| CN113427432A (en) * | 2020-03-23 | 2021-09-24 | 中国航发商用航空发动机有限责任公司 | Balance shaft sleeve disassembling assembly and disassembling method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105171687B (en) | 2017-01-18 |
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Address after: 710021 Xu Jia Bay, Xi'an, Shaanxi, Beijiao Patentee after: AECC AVIATION POWER CO,LTD. Address before: 710021 Xu Jia Bay, Xi'an, Shaanxi, Beijiao Patentee before: AVIC AVIATION ENGINE Corp.,PLC Address after: 710021 Xu Jia Bay, Xi'an, Shaanxi, Beijiao Patentee after: AVIC AVIATION ENGINE Corp.,PLC Address before: 710021 Xu Jia Bay, Xi'an, Shaanxi, Beijiao Patentee before: XI'AN AVIATION POWER Co.,Ltd. |
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Effective date of registration: 20240602 Address after: 710000, Room 401, 4th Floor, Building 7, Dapu Industrial Park, No. 4955 Shangyuan Road, Economic Development Zone, Xi'an City, Shaanxi Province Patentee after: XI'AN Xaec Suntimes HIGH-TECH Co.,Ltd. Country or region after: China Address before: 710021 Xu Jia Bay, Xi'an, Shaanxi, Beijiao Patentee before: AECC AVIATION POWER CO,LTD. Country or region before: China |