CN2573702Y - Improvement on steel top aluminium apron piston for 280/285 series locomotive diesel engine - Google Patents
Improvement on steel top aluminium apron piston for 280/285 series locomotive diesel engine Download PDFInfo
- Publication number
- CN2573702Y CN2573702Y CN 02274796 CN02274796U CN2573702Y CN 2573702 Y CN2573702 Y CN 2573702Y CN 02274796 CN02274796 CN 02274796 CN 02274796 U CN02274796 U CN 02274796U CN 2573702 Y CN2573702 Y CN 2573702Y
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- piston
- skirt
- diesel engine
- improvement
- connecting bolt
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Abstract
The utility model relates to an improvement of a steel top aluminum skirt piston for 280/285 series locomotive diesel engines, which is composed of a piston crown, a piston skirt and a connecting device of the piston skirt, wherein the connecting device of the piston is composed of connecting bolts and a flat gasket and the piston crown and the piston skirt are connected by four connecting bolts. The thickness H#-[1] of the through hole of the connecting bolt on the piston skirt is 95 to 105mm, the thickness H#-[3] of the flat gasket is 8 to 18mm, and the arrangement position L*S of the through hole central line of the connecting bolt on the piston skirt is (58-63) mm * (62-56) mm. Because of the creative improvement of the connecting structure and the arrangement between the piston crown and the piston skirt, the service life of the piston can be prolonged by more than two times.
Description
The improvement of technical field 280/285 series cab use for diesel engine steel crown and aluminum skirt piston of the present utility model belongs to use for diesel engine combined piston structural strength technical field.
Background technique is present, and existing 280/285 series cab use for diesel engine steel crown and aluminum skirt piston is underpass type steel crown and aluminum skirt piston (seeing accompanying drawing 1), and piston is made up of piston skirt (1), piston head (2) and connection set thereof.This connection set is made of stud (3), elastic sleeve (4), nut (5) and spring detent (6).Piston head (2) is connected by 4 stud (3) with piston skirt (1), and an end of stud (3) is screwed into piston head (2), and the other end passes piston skirt (1) and elastic sleeve (4) is tightened with nut (5), and nut (5) is locking by spring detent (6).Piston skirt (1) is gone up the via hole thickness H of stud (3)
1Be 53mm, elastic sleeve length H
2Be 58mm, the position L * S of centerline hole on piston skirt (1) excessively of stud (3) is 60mm * 60mm.The piston skirt fatigue crack damage because of the piston linkage structure is unreasonable with layout, once took place in this piston after diesel engine of locomotive utilization load strengthens, cause the accident of diesel engine serious damage.And repair in one in locomotive that (300,000 kilometers of travelings) piston skirt rhegma in batches occurred when diesel engine is opened and inspect in the phase, in serious 16 pistons of a diesel engine of locomotive, have 14 piston skirts that crackle is arranged unexpectedly.Only about 300,000 kilometers, be difficult to satisfy usage requirement the general working life of piston, has a strong impact on safety of railway traffic.
Summary of the invention is for overcoming owing to former piston head, skirt linkage structure and arranging that the unreasonable piston skirt key position stress raisers that cause are serious, the defective that piston reduces fatigue life significantly, improve the piston whole service life, guarantee safety of railway traffic, we have carried out big quantitative analysis, calculating and test.Analysis, calculating and test show, existing piston strengthens the skirt section, back at the diesel engine of locomotive load and rhegma in batches occurs, except piston skirt material, processing factors, also because of being furnished with pin-and-hole, oil inlet hole, spill port, threaded stud hole, counterbore seat surface on the piston skirt, near the sensitizing range that its knuckle, exists stress to concentrate, under the layout and the unreasonable situation of linkage structure of double-screw bolt, stress is concentrated serious, and just reduce significantly the fatigue life of piston.And existing piston is darker owing to 4 connection double-screw bolt counterbore Position Design, and its knuckle just is in the main power transmission zone, and it is bigger to locate STRESS VARIATION under the effect of gas blow-through pressure and bolt pretightening etc.Just easily germinate microscopic crack when stress alternation strengthens, piston works on, and crackle is located expansion to oil inlet hole, spill port etc., causes the piston skirt fatigue fracture at last.Based on above-mentioned analysis, the utility model provides a kind of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston of novel piston head, skirt linkage structure and layout, concentrates the sensitizing range to avoid this stress, improves piston working life.
The technological scheme that " improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston " of the present utility model solves the technical problem of its former piston existence is: steel crown and aluminum skirt piston is made up of piston skirt, piston head and connection set thereof.Its connection set is made of connecting bolt and plain washer, and piston head is connected by 4 connecting bolts with piston skirt.The via hole thickness H of connecting bolt on piston skirt
1Be 95～105mm, plain washer thickness H
3Be 8～18mm, and connecting bolt is crossed centerline hole and is arranged that on piston skirt L * S is for (58～63) mm * (62～56) mm scope.Connecting bolt can be screw or stud bolt.When connecting bolt was stud bolt, its end was screwed into piston head, and the other end passes piston skirt and plain washer nut screwing clamping; When connecting bolt was screw, screw passes piston skirt and plain washer is screwed into piston head.
" improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston " of the present utility model its beneficial technical effects is: because of it has been cancelled the elastic sleeve in the stud, piston skirt connecting bolt Placement and location arrangements, the degree of depth of bolt hole, several respects such as position of seat surface knuckle have been carried out the improvement of novelty in invention.The dimensional Finite Element that combined piston by two kinds of schemes that former combined piston and the utility model are provided carries out and analyzing relatively, piston of the present utility model, stress phase in the sensitizing range that stress is concentrated is obviously improved, the sensitivity that stress is concentrated obviously reduces, and has improved the structural strength of piston skirt integral body.As calculated, improving the minimum fatigue safety coefficient of back piston is 1.9, and the existing minimum fatigue safety coefficient of piston is 1.4, and fatigue safety coefficient obviously improves.Estimate through fatigue life, to be enhanced about more than once the working life of the piston after the improvement than former piston, thereby make 280/285 series cab use for diesel engine steel crown and aluminum skirt piston under the situation that locomotive load strengthens, to reach 1 overhaul phase the fatigue life of piston, can satisfy the requirement of diesel engine of locomotive reinforcing power, and piston head, skirt linkage structure are simple, processing is checked convenient, be convenient to make maintenance, save manufacturing, maintenance cost.
Description of drawings is further described " improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston " of the present utility model below in conjunction with drawings and Examples.
Accompanying drawing 1. existing diesel engine of locomotive steel top aluminium apron piston structure schematic representation
Accompanying drawing 2. steel crown and aluminum skirt pistons of the present utility model (connecting bolt is a screw) structural representation
Accompanying drawing 3. steel crown and aluminum skirt pistons of the present utility model (connecting bolt is a stud bolt) structure is shown
Intention
Accompanying drawing 4. steel crown and aluminum skirt piston example structure schematic representation of the present utility model
In the accompanying drawing: (1) piston skirt, (2) piston head, (3) stud, (4) elastic sleeve,
(5) nut, (6) spring detent, (7) connecting bolt, (8) plain washer, (9) screw
Embodiment of embodiment " improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston " of the present utility model as shown in Figure 4.Steel crown and aluminum skirt piston is made up of piston skirt (1), piston head (2) and connection set thereof.Its connection set is made of connecting bolt (7) and plain washer (8), and piston head (2) is connected by 4 connecting bolts (7) with piston skirt (1).The via hole thickness H of connecting bolt (7) on piston skirt (1)
1Be 102mm, plain washer thickness H
3Be 10mm, and connecting bolt (7) mistake centerline hole is 61mm * 59mm at the last position L * S of piston skirt (1).The connecting bolt that the connection set of present embodiment is selected for use (7) is a screw (9), and screw (9) passes piston skirt (1) and plain washer (6) is screwed into piston head (1).Piston skirt (1) is gone up connecting bolt (7) via hole thickness H
1Be 102mm, plain washer thickness H
3Be 10mm, and connecting bolt (7) mistake centerline hole is 61mm * 59mm at the last position L * S of piston skirt (1).Calculating and test result prove: steel crown and aluminum skirt piston of the present invention will improve a lot its fatigue life, life-span will reach 1 overhaul phase, and linkage structure is simple, more former piston has been saved elastic sleeve (6), nut (5) and spring detent (8), processing is checked convenient, can satisfy the requirement of diesel engine of locomotive reinforcing power.
Claims (2)
1. the improvement of a series cab use for diesel engine steel crown and aluminum skirt piston, it is made up of piston skirt (1), piston head (2) and connection set thereof, it is characterized in that: connection set is made of connecting bolt (7), plain washer (8), piston head (2) is connected with 4 connecting bolts (7) with piston skirt (1), the via hole thickness H of connecting bolt (7) on piston skirt (1)
1Be 95～105mm, plain washer (8) thickness H
3Be 8～18mm, connecting bolt (7) centerline hole excessively is (58～63) mm * (62～56) mm at the last position L * S of piston skirt (1).
2. the improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston according to claim 1 is characterized in that: connecting bolt (7) can be screw (9) or stud bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02274796 CN2573702Y (en) | 2002-08-16 | 2002-08-16 | Improvement on steel top aluminium apron piston for 280/285 series locomotive diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02274796 CN2573702Y (en) | 2002-08-16 | 2002-08-16 | Improvement on steel top aluminium apron piston for 280/285 series locomotive diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2573702Y true CN2573702Y (en) | 2003-09-17 |
Family
ID=33738990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02274796 Expired - Lifetime CN2573702Y (en) | 2002-08-16 | 2002-08-16 | Improvement on steel top aluminium apron piston for 280/285 series locomotive diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2573702Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101331307B (en) * | 2005-12-17 | 2010-08-11 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN101253322B (en) * | 2005-09-01 | 2012-06-06 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN101896711B (en) * | 2007-12-14 | 2012-08-08 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN107630764A (en) * | 2017-08-10 | 2018-01-26 | 中国北方发动机研究所(天津) | A kind of NEW TYPE OF COMPOSITE heat insulation structural piston |
| CN112555047A (en) * | 2020-12-08 | 2021-03-26 | 江苏永航轨道交通科技有限公司 | Steel crown and aluminum skirt combined piston |
-
2002
- 2002-08-16 CN CN 02274796 patent/CN2573702Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101253322B (en) * | 2005-09-01 | 2012-06-06 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN101331307B (en) * | 2005-12-17 | 2010-08-11 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN101896711B (en) * | 2007-12-14 | 2012-08-08 | 马勒国际公司 | Two-piece piston for an internal combustion engine |
| CN107630764A (en) * | 2017-08-10 | 2018-01-26 | 中国北方发动机研究所(天津) | A kind of NEW TYPE OF COMPOSITE heat insulation structural piston |
| CN112555047A (en) * | 2020-12-08 | 2021-03-26 | 江苏永航轨道交通科技有限公司 | Steel crown and aluminum skirt combined piston |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120816 Granted publication date: 20030917 |