CN203856874U - Compressor and connecting rod lining thereof - Google Patents
Compressor and connecting rod lining thereof Download PDFInfo
- Publication number
- CN203856874U CN203856874U CN201420198483.6U CN201420198483U CN203856874U CN 203856874 U CN203856874 U CN 203856874U CN 201420198483 U CN201420198483 U CN 201420198483U CN 203856874 U CN203856874 U CN 203856874U
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- CN
- China
- Prior art keywords
- oil groove
- rob bushing
- connecting rob
- lining
- connecting rod
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000005461 lubrication Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000011514 reflex Effects 0.000 description 8
- 208000004141 microcephaly Diseases 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Abstract
The utility model provides a compressor and a connecting rod lining thereof. The connecting rod lining comprises a barrel-type lining body and at least one rotating oil groove, wherein two end holes are formed in the lining body, and the rotating oil groove and the connecting rod lining are relatively obliquely formed in the lining body in the axis direction; a bearing region does not influence the position of the oil groove, the carrying capacity of the lining is not violently influenced by that the oil groove is formed in the bearing region of the connecting rod lining or not; the influence of the oil groove on a specific pressure surface of a shaft and the lining is effectively reduced, the oil groove formed in the connecting rod lining is obliquely arranged, and thus, the oil groove and the shaft can be in the non-interruption contact, and the lubrication is stable, continuous and uniform. The connecting rod lining provided by the utility model has the advantages of being capable of effectively improving the problem that the lubrication effect is relatively poor when the compressor does not have a back angle, improving the reliability of the compressor, improving a stress and lubrication condition of a cross-head pin and stress on a relative movement part of the lining, prolonging the service life of the compressor, and the like.
Description
Technical field
The utility model relates to Compressor Technology field, particularly relates to a kind of connecting rob bushing for compressor connecting bar.
Background technique
Connecting rod is one of major part in compressor motion, and its effect is to coordinate rotatablely moving of compressor of input to be converted into the to-and-fro motion of piston with bent axle.Connecting rod and bent axle joining end are connnecting rod big end, with crosshead pin or wrist pin joining end be connecting rod small end.In existing microcephaly, be set with lining, be mainly used in reducing wearing and tearing, vibration and the noise at relative sliding place, lining also has etch-proof function, is convenient to the maintenance of equipment and changes conveniently.
Bush inside is provided with oil groove conventionally, and the mode that existing domestic compressor connecting bar small end bushing is arranged oil groove is mostly according to two kinds of given oil groove arranged in form of JB/T2236-2005 " reciprocating-piston compressor lining of connecting rod small end ".These two kinds of oil groove setting types are: as shown in Fig. 1 a～1c, lining 5 inwalls are provided with many oil grooves 50 parallel with lining axial direction and a Circumferential oil groove 51; Or as shown in Fig. 1 d～1f, lining 6 inwalls are provided with many oil grooves 60 parallel with lining 6 axial directions, and lining 6 outer walls are provided with a Circumferential oil groove 61.In addition,, in some slow-speed of revolution compressors, can adopt a word oil groove 40 as shown in Figure 2 a or the pattern of annular oil groove as shown in Figure 2 b 30.
In realizing its function, also there is more narrow limitation according to the oil groove of above-mentioned arranged in form, for example: the oil groove straight-through at pressure span processing and oil supply source can sharply reduce lining bearing capacity, and under above two kinds of tank structures, operation can have a strong impact on the working life of lining; Reflex angle refers to that compressor crank shaft rotated a circle in the time, the angle that comprehensive reverse load endurance inside crank turns over.When employing standard lining, if do not have enough large reflex angle will cause crosshead pin and lining of connecting rod small end only continue friction and produce in a short period of time high temperature and burn in regional area.Even if reserved enough reflex angles in the time of unit design, in the time of unit actual motion, also may there is the situation without reflex angle, for example adopt to press off suction valve and regulate when tolerance or operator's misoperation etc.As can be seen here, there is certain limitation in standard lining lubricating function in the situation that of reflex angle deficiency; The fuel feeding of straight line oil groove in crosshead pin sense of rotation is also discontinuous, and oil mass supply is inhomogeneous.
Therefore, provide a kind of and can overcome the above-mentioned circumscribed connecting rob bushing that is applicable to compressor connecting bar microcephaly, make the moving element greasy property of compressor good, further extend the working life of compressor, become a large technical problem urgently to be resolved hurrily in the industry.
Model utility content
The utility model will solve the technical problem that connecting rob bushing in prior art working life is short and lubrication effect is poor.
For solving the problems of the technologies described above, the utility model adopts following technological scheme:
The utility model proposes a kind of connecting rob bushing, comprise the bush body that is tubular, described bush body has two-port, wherein, described connecting rob bushing also comprises and curls up at least together oil groove, described in curl up oil groove and described connecting rob bushing axial direction relative tilt and be located at the inwall of described bush body.
According to a mode of execution of the present utility model, at least one end of curling up oil groove described in per pass extends to the port of described bush body.
According to another mode of execution, described bush body inwall interval evenly and is abreast provided with multiple tracks and curls up oil groove.
According to another mode of execution, described in per pass, curling up oil groove is head end near the end of a port of described bush body, be tail end near the end of other port, curl up the head end of oil groove described in adjacent twice and the line of tail end is parallel to described bush body axis.
According to another mode of execution, described in curl up oil groove quantity be 4～10 roads.
According to another mode of execution, described in to curl up oil groove be 18 °～45 ° with respect to the lead angle of described connecting rob bushing axial direction.
According to another mode of execution, curl up oilhole of the equal UNICOM of oil groove described in per pass.
According to another mode of execution, described connecting rob bushing also comprises at least one Circumferential oil groove of being circumferentially located at its outer wall along described bush body, and described at least one Circumferential oil groove is equipped with a described oilhole with described each intersection point place of curling up oil groove together with at least.
According to another mode of execution, adjacent described Circumferential oil groove interval is even.
According to another mode of execution, the quantity of described Circumferential oil groove is 1～3 road.
In order to solve the problems of the technologies described above, the technological scheme the utility model proposes also comprises: propose a kind of compressor, comprise connecting rod, described connecting rod has a stub end and a little head end, described little head end has containing space, wherein, described connecting rob bushing is installed in described containing space.
As shown from the above technical solution, the compressor the utility model proposes and connecting rob bushing thereof have the following advantages and good effect: the oil groove positions of the connecting rob bushing the utility model proposes is not subject to the impact of bearing area, and violent impact all can not caused to the bearing capacity of lining in the bearing area that no matter whether oil groove is located at connecting rob bushing; Effectively reduce the impact of the ratio pressure surface that oil groove contacts with lining axle; The oil groove of offering due to the connecting rob bushing inside the utility model proposes, for being obliquely installed, therefore can making oil groove and axle realize free of discontinuities formula and contact, and makes lubricated stable, continuously and evenly.The poor problem of lubrication effect when the connecting rob bushing the utility model proposes has effectively improved compressor without reflex angle, and there is the compressor reliability of increasing, improve crosshead pin and lining relative movement place is stressed and lubrication circumstances, prolongation compressor working life etc. advantage.
Brief description of the drawings
Fig. 1 a is the structural representation of a mode of execution of existing reciprocating-piston compressor lining of connecting rod small end, is a kind of oil groove setting type of JB/T2236-2005 (Machinery Ministry proposed standard) recommendation;
Fig. 1 b is the partial enlarged drawing of Fig. 1 a, represents an oil groove;
Fig. 1 c is the sectional view of Fig. 1 a;
Fig. 1 d is the structural representation of another mode of execution of existing reciprocating-piston compressor lining of connecting rod small end, is the another kind of oil groove setting type of JB/T2236-2005 (Machinery Ministry proposed standard) recommendation;
Fig. 1 e is the partial enlarged drawing of Fig. 1 d, represents an oil groove;
Fig. 1 f is the sectional view of Fig. 1 d;
Fig. 2 a is the partial structurtes schematic diagram of a mode of execution of existing slow-speed of revolution compressor connecting bar small end bushing, represents a word setting type of oil groove;
Fig. 2 b is the partial structurtes schematic diagram of another mode of execution of existing slow-speed of revolution compressor connecting bar small end bushing, represents the form that is circular layout of oil groove;
Fig. 3 is the perspective view of the first mode of execution of the connecting rob bushing that the utility model proposes;
Fig. 4 be the connecting rob bushing that the utility model proposes the first mode of execution longitudinally analyse and observe perspective view;
Fig. 5 is the partial structurtes schematic diagram of the compressor that the utility model proposes, represents the matching relationship of connecting rod and connecting rob bushing.
Wherein, description of reference numerals is as follows:
1. connecting rob bushing; 10. bush body; 11. oilholes; 12. curl up oil groove; 13. Circumferential oil grooves; 2. connecting rod; 20. stub ends; 21. little head ends; 22. containing spaces; 30. annular oil grooves; 40. 1 word oil grooves; 5. lining; 50. oil grooves; 51. Circumferential oil grooves; 6. lining; 60. oil grooves; 61. Circumferential oil grooves.
Embodiment
The exemplary embodiments that embodies the utility model feature & benefits will describe in detail in the following description.Be understood that the utility model can have various variations in different embodiments, it neither departs from scope of the present utility model, and explanation wherein and to be shown in be the use explaining in essence, but not in order to limit the utility model.
The utility model proposes a kind of compressor and connecting rob bushing thereof, wherein connecting rob bushing 1 mainly comprises the bush body 10 that is tubular, and this bush body 10 has two ports.The inwall of bush body 10 is also provided with and curls up at least together oil groove 12, and preferred, the quantity of curling up oil groove 12 can be 4～10 roads, but not as limit.This connecting rob bushing 1 is mainly applicable to high rotating speed Reciprocting piston compressor connecting rod small end place, the lubrication problem can solve compressor without reflex angle time.
Connecting rob bushing mode of execution 1
As shown in Figure 3 and Figure 4, present embodiment proposes a kind of connecting rob bushing 1, and the microcephaly who is mainly used in being sleeved on compressor connecting bar 2 holds 21.
As shown in Figure 3 and Figure 4, the connecting rob bushing 1 that present embodiment proposes mainly comprises cylindrical circular bush body 10, and bush body 10 has two-port.Bush body 10 inwalls are provided with 8 roads and curl up oil groove 12, and its outer wall is provided with 1 road Circumferential oil groove 13, offer 8 oilholes 11 in bush body 10.Further, this 8 road curls up oil groove 12 and is parallel to each other, and, it is head end near the end of a port of bush body 10 that per pass curls up oil groove 12, be tail end near the end of other port, adjacent twice are curled up the axis that the head end of oil groove 12 and the line of tail end are parallel to bush body 10,, there is connecting rob bushing 1 that this kind curl up oil groove 12 structures in rotary course, can stablize, continuously and equably axle is lubricated.For example, at connecting rob bushing 1 in the process of crankshaft rotating, be as the criterion with the surface of contact that is approximately wire on bent axle and connecting rob bushing 1 surface of contact, before curl up together oil groove 12 tail end when leaving this surface of contact, the head end that curls up together down oil groove 12 starts to contact oil supply with this surface of contact, realize and curled up that oil groove 12 contacts without interruption with bent axle and instantaneous line contact length is greater than the width of oil groove, significantly promoted lubrication effect.
As shown in Figure 3, in the present embodiment, bush body 10 can be selected conventional construction, and bush body 10 is cylindric and two ends and has two open ports.
As shown in Figure 3, in the present embodiment, curl up oil groove 12 and be located at the inwall of bush body 10.In the present embodiment, per pass curl up oil groove 12 all with the axial direction relative tilt α at an angle of connecting rob bushing 1, i.e. lead angle, and 45 ° of 10 ° of < α <, α can be preferably 22.5 °, but not as limit.Further, in the present embodiment, respectively curl up the angle of inclination of oil groove 12 and size all identical and be evenly distributed in the inwall of bush body 10, but not as limit.
As shown in Figure 3, in the present embodiment, each curling up all offers an oilhole 11 on oil groove 12, but not as limit, curls up and on oil groove 12, offers the oilhole 11 that at least one penetrates bush body 10 with at least one.These oilholes 11 are mainly used in lubricant oil by outside its inside of infiltrating of bush body 10.
As shown in Figure 3, in the present embodiment, Circumferential oil groove 13 is located on the outer wall of bush body 10, and its shape is identical with the cross section of bush body 10, but not as limit.Because Circumferential oil groove 13 is surrounded on bush body 10 outer walls, and respectively curl up oil groove 12 and be located at the inwall of bush body 10, respectively curl up oil groove 12 and form 8 intersection points with Circumferential oil groove 13.In the present embodiment, offer in above each intersection point place the hole that penetrates bush body 10, i.e. 8 oilholes 11.Further, Circumferential oil groove 13 is located at the middle part of bush body 10 outer walls, and per pass curls up oil groove 12 is located at bush body 10 inwall middle parts, be that each oilhole 11 is all positioned at the middle part of respectively curling up oil groove 12, so that lubricated more even, but not as limit, the position of each oilhole 11 can flexible transformation, be not limited in the intersection point that curls up oil groove 12 and Circumferential oil groove 13.
In addition, need, in the equipment of larger oil inlet quantity, can add more oilhole 11 at some, to curl up the oilhole 11 of oil groove 12 UNICOMs not unique with per pass, and the quantity of Circumferential oil groove 13 is also not unique, can be preferably 1～3 road, but not as limit.In the time that Circumferential oil groove 13 is multiple tracks, preferred, the interval of each Circumferential oil groove 13 evenly and be parallel to each other, but not as limit.
For the design of connecting rob bushing 1, need to consider emphatically specific pressure P, as not examining while curling up oil groove 12 area, specific pressure can be calculated setting by formula P=F/db.In this formula, F is the maximum support counter-force of connecting rob bushing 1, and d is the internal diameter of connecting rob bushing 1, and b is the width of connecting rob bushing 1.Further, consider the impact of curling up oil groove 12 and oilhole 11, therefore by remove the area that curls up oil groove 12 or oilhole 11 than pressure surface after, can obtain final specific pressure.
As only considered the lubrication of connecting rob bushing 1, curl up oil groove 12 quantity mostly to be good, cross at most and can cause serious impact by reduced pressure but curl up oil groove 12 quantity, consider therefore curl up definite need of oil groove 12 quantity.Taking 4.5 tons of piston force compressors as example, by after calculating must for connecting rob bushing 1 inwall evenly arrange 8 the most favourable to lubrication effect and specific pressure while curling up oil groove 12, therefore the final shaping is for curling up 22.5 ° of oil groove 12 lead angles, length L=1/8P (P is pitch), article 8, the inwall that curls up oil groove 12 and be circumferentially distributed in connecting rob bushing 1, curls up oil groove 12 and is always 8 × 22.5 × 2=360 ° around angle.
Can find out by finite element analysis software, in the situation that piston force is 4.5 tons, the specific pressure of connecting rob bushing 1 high specific pressure point is 24.61MPa, far below its yield force, and offset variable also all in the reasonable scope, curl up oil groove 12 place's stressing conditions good, unstressed concentrating or the appearance of hypergeometric pressure situation.
In addition, if existing straight line type oil groove is arranged on the bearing area of connecting rob bushing 1, can sharply reduce the bearing capacity of connecting rob bushing 1, but the connecting rob bushing 1 the utility model proposes is due to its structural characteristics of curling up oil groove 12, curl up the length of oil groove 12 in bearing area and only account for the sub-fraction of connecting rob bushing 1 carrying section, the bearing capacity of connecting rob bushing 1 be there is no to considerable influence.The moment line contact length of existing straight line type oil groove lining and axle is oil groove width, but the moment line contact length of the connecting rob bushing 1 the utility model proposes is 2.61 times (curling up oil groove 12 width/sin22.5 °) of curling up oil groove 12 width, make lubrication circumstances be improved significantly, and any position in bearing area, curl up oil groove 12 all identical with the contact width of axle and connecting rob bushing 1, make continuously lubricated and even.Axle has often turned one and has curled up oil groove 12 in this lining, all can once be lubricated in contact total length, often rotate a circle, axle just can by 8 curl up oil groove 12 obtain 8 times lubricated, axle can be worked under good lubricated environment.In addition, the utility model has also solved the lubrication problems of equipment when without reflex angle such as such as compressor, for example, in the coordinating of connecting rob bushing 1 and crosshead pin, even if also can realize lubricating function in gapless situation between crosshead pin and connecting rob bushing 1.
Connecting rob bushing mode of execution 2
The second mode of execution of the connecting rob bushing 1 the utility model proposes, its main structure is identical with the first mode of execution, and difference is:
Oilhole 11 is not opened on the wall of bush body 10, also removes the structure of circumferentially curling up oil groove 12 in the first mode of execution.Infiltrate the function of lubricant oil for reaching, at least one end of curling up oil groove 12 extends to the port of bush body 10, that is, utilize these to be formed at respectively the notch that curls up oil groove 12 and extend to the port of bush body 10, replaces oilhole 11 to infiltrate lubricant oil.As shown in Figure 8, in the present embodiment, the two ends that per pass curls up oil groove 12 all extend to the port part of bush body 10 to its direction of both ends.
Compressor mode of execution
The mode of execution of the compressor the utility model proposes.As shown in Figure 5, in the present embodiment, compressor can be selected conventional construction, and comprises that connecting rod 2, the two ends of this connecting rod 2 have respectively a stub end 20 and a microcephaly holds 21.Microcephaly holds 21 to have containing space 22 in order to installing connecting rods lining 1.
Though described compressor of the present utility model and connecting rob bushing thereof with reference to several exemplary embodiments, should be understood that term used is explanation and illustrative, and not restrictive.Because the utility model can specifically be implemented in a variety of forms and not depart from its design or essence, therefore, above-described embodiment is not limited to any aforesaid details, and explain widely in the design that should limit in the claim of enclosing and scope, therefore all should be the claim of enclosing, the whole variations in the claim of falling into or its equivalent scope and remodeling contains.
Claims (12)
1. a connecting rob bushing (1), comprise the bush body (10) that is tubular, described bush body (10) has two-port, it is characterized in that, described connecting rob bushing (1) also comprises and curls up at least together oil groove (12), described in curl up oil groove (12) and described connecting rob bushing (1) axial direction relative tilt and be located at the inwall of described bush body (10).
2. connecting rob bushing according to claim 1 (1), is characterized in that, at least one end of curling up oil groove (12) described in per pass extends to the port of described bush body (10).
3. connecting rob bushing according to claim 1 (1), is characterized in that, described bush body (10) inwall interval evenly and is abreast provided with multiple tracks and curls up oil groove (12).
4. connecting rob bushing according to claim 3 (1), it is characterized in that, described in per pass, curling up oil groove (12) is head end near the end of a port of described bush body (10), be tail end near the end of other port, curl up the head end of oil groove (12) described in adjacent twice and the line of tail end is parallel to described bush body (10) axis.
5. connecting rob bushing according to claim 3 (1), is characterized in that, described in curl up oil groove (12) quantity be 4～10 roads.
6. connecting rob bushing according to claim 3 (1), is characterized in that, described in to curl up oil groove (12) be 18 °～45 ° with respect to the lead angle of described connecting rob bushing (1) axial direction.
7. according to the connecting rob bushing described in any one in claim 2～6 (1), it is characterized in that, curl up all oilholes of UNICOM (11) of oil groove (12) described in per pass.
8. connecting rob bushing according to claim 7 (1), it is characterized in that, described connecting rob bushing (1) also comprises at least one Circumferential oil groove (13) of being circumferentially located at its outer wall along described bush body (10), and described at least one Circumferential oil groove (13) is equipped with a described oilhole with described each intersection point place of curling up oil groove (12) together with at least.
9. connecting rob bushing according to claim 8 (1), is characterized in that, adjacent described Circumferential oil groove (13) interval is even.
10. connecting rob bushing according to claim 8 (1), is characterized in that, the quantity of described Circumferential oil groove (13) is 1～3 road.
11. 1 kinds of compressors, comprise connecting rod (2), described connecting rod (2) has a stub end (20) and a little head end (21), described little head end (21) has containing space (22), it is characterized in that, the connecting rob bushing (1) as described in any one in claim 1～6,8～10 is installed in described containing space (22).
12. 1 kinds of compressors, comprise connecting rod (2), described connecting rod (2) has a stub end (20) and a little head end (21), described little head end (21) has containing space (22), it is characterized in that, connecting rob bushing as claimed in claim 7 (1) is installed in described containing space (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198483.6U CN203856874U (en) | 2014-04-22 | 2014-04-22 | Compressor and connecting rod lining thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198483.6U CN203856874U (en) | 2014-04-22 | 2014-04-22 | Compressor and connecting rod lining thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203856874U true CN203856874U (en) | 2014-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420198483.6U Expired - Lifetime CN203856874U (en) | 2014-04-22 | 2014-04-22 | Compressor and connecting rod lining thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN203856874U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107471111A (en) * | 2017-09-20 | 2017-12-15 | 方乐 | A kind of outer ring raceway feeding grinder system |
| CN107866465A (en) * | 2016-09-27 | 2018-04-03 | 褚瑜 | Linkage |
| CN110080969A (en) * | 2019-05-30 | 2019-08-02 | 无锡压缩机股份有限公司 | A kind of small end bushing tank structure and its processing technology |
| CN110446864A (en) * | 2017-03-30 | 2019-11-12 | 三菱重工业株式会社 | Cross head bearing and crosshead and framework, cross-head type internal combustion engine |
| CN111623039A (en) * | 2020-05-07 | 2020-09-04 | 丰电金凯威(北京)科技有限公司 | Crosshead copper sheathing |
| CN112756904A (en) * | 2020-12-28 | 2021-05-07 | 国营第六一六厂 | Guide sleeve for remanufacturing and repairing five-axis boring machine and repairing method |
-
2014
- 2014-04-22 CN CN201420198483.6U patent/CN203856874U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107866465A (en) * | 2016-09-27 | 2018-04-03 | 褚瑜 | Linkage |
| CN110446864A (en) * | 2017-03-30 | 2019-11-12 | 三菱重工业株式会社 | Cross head bearing and crosshead and framework, cross-head type internal combustion engine |
| CN107471111A (en) * | 2017-09-20 | 2017-12-15 | 方乐 | A kind of outer ring raceway feeding grinder system |
| CN110080969A (en) * | 2019-05-30 | 2019-08-02 | 无锡压缩机股份有限公司 | A kind of small end bushing tank structure and its processing technology |
| CN111623039A (en) * | 2020-05-07 | 2020-09-04 | 丰电金凯威(北京)科技有限公司 | Crosshead copper sheathing |
| CN111623039B (en) * | 2020-05-07 | 2021-10-22 | 丰电金凯威(苏州)压缩机有限公司 | Crosshead copper sheathing |
| CN112756904A (en) * | 2020-12-28 | 2021-05-07 | 国营第六一六厂 | Guide sleeve for remanufacturing and repairing five-axis boring machine and repairing method |
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