CN219639249U - Engine connecting rod and connecting structure of engine connecting rod and piston rod - Google Patents
Engine connecting rod and connecting structure of engine connecting rod and piston rod Download PDFInfo
- Publication number
- CN219639249U CN219639249U CN202320568592.1U CN202320568592U CN219639249U CN 219639249 U CN219639249 U CN 219639249U CN 202320568592 U CN202320568592 U CN 202320568592U CN 219639249 U CN219639249 U CN 219639249U
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- connecting rod
- piston
- rod
- engine
- piston pin
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- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
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- 238000005260 corrosion Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The utility model discloses an engine connecting rod, a connecting rod and a piston rod connecting structure, which comprises a connecting rod body, wherein two ends of the connecting rod body are provided with a small connecting rod head and a large connecting rod head, the small connecting rod head comprises two supporting parts, the two supporting parts are respectively provided with a supporting hole, a piston pin is inserted into each supporting hole, the piston pin can transversely move relative to the supporting holes, the piston pin is provided with an anti-dropping device, and the anti-dropping device is used for preventing the piston pin from dropping from the small connecting rod head. When the piston of the engine moves up and down, the piston pin passes through the piston rod bushing of the piston rod, and the piston pin can transversely slide relative to the supporting hole in the movement process of the piston rod, so that a certain position can be transversely offset, and the joint of the connecting rod and the piston rod can be operated more flexibly.
Description
Technical Field
The utility model belongs to the technical field of engines, and particularly relates to an engine connecting rod and a connecting structure of the engine connecting rod and a piston rod.
Background
The engine connecting rod is one of key parts of the gas expansion compression engine, and the engine connecting rod is used for transmitting the gas pressure born by the piston crown to the piston rod, and the piston rod drives the crankshaft and converts the reciprocating motion of the piston into the rotary motion of the crankshaft. The engine connecting rod is structurally composed of a connecting rod big end, a connecting rod small end, a connecting rod bolt, a connecting rod bearing bush and other parts. Because the gas expansion compression engine mainly uses gas to do work by thermal expansion, oily substances and the like cannot exist in the cavity. Therefore, the structure design of the engine connecting rod has no lubrication oil passage hole, and the defect that the lubrication hole is not good at the joint of the connecting rod and the piston rod is inflexible in operation, so that the service life is influenced.
Disclosure of Invention
The utility model aims to provide an engine connecting rod and a connecting structure of the engine connecting rod and a piston rod, so that the connecting part of the connecting rod and the piston rod can run more flexibly.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an engine connecting rod, includes the connecting rod body, the both ends of connecting rod body are equipped with connecting rod tip and connecting rod tip, the connecting rod tip includes two supporting parts, two all be equipped with the supporting hole on the supporting part, the piston pin has been inserted in the supporting hole, the piston pin can be relative supporting hole lateral shifting, be equipped with anti-drop device on the piston pin, anti-drop device is used for preventing the piston pin is followed the connecting rod tip is dropped.
Further, a bushing is fixed on the inner wall of the supporting hole, the piston pin penetrates through the bushing, and the piston pin can transversely move relative to the bushing.
Further, the bushing is an alloy bushing.
Further, the anti-falling device is two circlips, annular grooves are formed in two ends of the piston pin, the two circlips are respectively sleeved on the two annular grooves, and the distance between the two circlips is larger than the distance between the opposite faces of the supporting portions.
Further, the fit clearance between the bushing and the piston pin is 0.008-0.02 mm.
Further, be equipped with first recess on the connecting rod big end, be connected with the connecting seat on the connecting rod big end, be equipped with the second recess that corresponds with first recess on the connecting seat, first recess with the second recess forms the connection circle, first recess with the inner wall of second recess all is equipped with the constant head tank, install two semi-axis tiles in the connection circle, every be equipped with the location arch on the outer wall of semi-axis tile, two the location arch of semi-axis tile respectively with two the constant head tank grafting.
Further, first through holes are formed in two sides of the large end of the connecting rod, two second through holes corresponding to the two first through holes are formed in two sides of the connecting seat, connecting bolts are arranged in the two first through holes in a penetrating mode, the two connecting bolts respectively penetrate through the corresponding second through holes, and connecting nuts are connected to one ends of the connecting bolts penetrating through the second through holes in a threaded mode.
Further, two connecting bolt's tip all is equipped with prevents changeing the plane, be equipped with big head on the connecting rod big head and prevent changeing the face, prevent changeing the plane with big head prevents changeing the face laminating.
Further, the piston pin is provided as a hollow pin.
The connecting structure comprises a piston rod and the engine connecting rod, wherein a first connecting hole is formed in the first connecting end of the piston rod, a piston rod bushing is fixed on the inner wall of the first connecting hole, the first connecting end is arranged between the two supporting parts, and a piston pin penetrates through the piston rod bushing.
Compared with the prior art, the utility model has the beneficial effects that:
(1) When the piston of the engine moves up and down, as the piston pin passes through the piston rod bushing of the piston rod, the piston pin can transversely slide relative to the supporting hole in the movement process of the piston rod, so that a certain position can be transversely offset, and the joint of the connecting rod and the piston rod can be operated more flexibly;
(2) During movement, the piston pin is utilized to perform friction movement in the bushing, so that oil duct lubrication is not needed, the wear resistance is ensured, and the service life is prolonged;
(3) The two ends of the piston pin are limited by adopting a mode of elastic check rings, so that the piston pin is prevented from falling off;
(4) The anti-rotation plane is attached to the big head anti-rotation plane, so that the connecting bolt is prevented from rotating when the connecting nut is screwed down.
Drawings
FIG. 1 is a schematic illustration of the construction of an engine connecting rod of the present utility model;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is an enlarged view of a portion of the portion I of FIG. 3;
FIG. 5 is a side view of FIG. 1;
FIG. 6 is a cross-sectional view at B-B in FIG. 5;
FIG. 7 is an exploded view of FIG. 1;
FIG. 8 is a schematic structural view of a piston rod;
fig. 9 is a cross-sectional view of the engine connecting rod and piston rod when connected.
In the figure: 1. a connecting rod body; 2. a small end of the connecting rod; 3. a connecting rod big end; 4. a support part; 5. a support hole; 6. a piston pin; 7. a bushing; 8. a circlip; 9. a ring groove; 10. a first groove; 11. a connecting seat; 12. a positioning groove; 13. half bearing bush; 14. positioning the bulge; 15. a first perforation; 16. a second perforation; 17. a connecting bolt; 18. a coupling nut; 19. an anti-rotation plane; 20. a big head anti-rotation surface; 21. a second groove; 22. a piston rod; 23. a first connection end; 24. a first connection hole; 25. a piston rod bushing.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-9, the present utility model provides an engine connecting rod and an assembly process scheme for the engine connecting rod.
The utility model provides an engine connecting rod, including connecting rod body 1, connecting rod body 1's both ends are equipped with connecting rod tip 2 and connecting rod tip 3, connecting rod tip 2 includes two supporting part 4, all be equipped with supporting hole 5 on two supporting parts 4, peg graft in the supporting hole 5 has piston pin 6, piston pin 6 can relative supporting hole 5 lateral shifting, be equipped with first connecting hole 24 on piston rod 22's the first link 23, first connecting hole 24 inner wall is fixed with piston rod bush 25, piston rod 22's first link 23 sets up between two supporting part 4, piston pin 6 passes the piston rod bush 25 of first connecting hole 24 inner wall, be equipped with anti-drop device on the piston pin 6, anti-drop device is used for preventing that piston pin 6 from dropping from connecting rod tip 2.
The first connecting end 23 of the piston rod 22 and the connecting rod small end 2 do complex plane movement in a left-right swinging mode besides up-down movement, and when the piston of the engine moves up and down, as the piston pin 6 passes through the piston rod bushing 25 of the piston rod 22, the piston pin 6 can transversely slide relative to the supporting hole 5 in the movement process of the piston rod 22, so that a certain position transverse offset can be realized, and the connecting position of the connecting rod and the piston rod can be operated more flexibly.
Further, a bush 7 is fixed to the inner wall of the support hole 5, the piston pin 6 passes through the bush 7, and the piston pin 6 can move laterally with respect to the bush 7. During movement, the piston pin 6 is utilized to perform friction movement in the bushing 7, so that oil duct lubrication is not needed, the wear resistance is ensured, and the service life is prolonged.
The bushing 7 is an alloy bushing 7, and is specifically a tin-lead bronze bushing 7, and the brand (ZCuPb 10Sn 10) material belongs to cast copper alloy, and has good lubricating property, wear resistance and corrosion resistance, thermal conductivity, temperature aggregation resistance, anti-lock property and good stability in the running process; the method has good adaptability to the working environment, has the advantages of oxidation resistance and corrosion resistance, and maintains the original form to the maximum extent; the tin-lead bronze bushing 7 contains part of other soft metals and antifriction metals, and has the characteristic of improving self-lubricating performance in running-in and working.
The anti-drop device is two circlips 8, and the both ends of wrist pin 6 all are equipped with annular 9, and two circlips 8 cover respectively are established on two annular 9, and the interval between two circlips 8 is greater than the distance between the face that two supporting parts 4 are opposite to each other.
The two ends of the piston pin 6 are limited by adopting the elastic check ring 8, so that the piston pin 6 is prevented from falling off. The fit clearance between the bushing 7 and the piston pin 6 is 0.008-0.02 mm.
The piston pin 6 is provided as a hollow pin in order to reduce the weight of the piston pin 6.
Be equipped with first recess 10 on the connecting rod big end 3, be connected with connecting seat 11 on the connecting rod big end 3, be equipped with the second recess 21 that corresponds with first recess 10 on the connecting seat 11, first recess 10 and second recess 21 form the connection circle, and the inner wall of first recess 10 and second recess 21 all is equipped with constant head tank 12, installs two semi-axis tiles 13 in the connection circle, is equipped with location arch 14 on the outer wall of every semi-axis tile 13, and the location arch 14 of two semi-axis tiles 13 pegging graft with two constant head tanks 12 respectively. The crankshaft of the engine passes through two half shoes 13, and the up-and-down motion of the piston is converted into rotational motion of the crankshaft by a connecting rod.
The two sides of the connecting rod big end 3 are respectively provided with a first perforation 15, the two sides of the connecting seat 11 are respectively provided with two second perforation 16 corresponding to the two first perforation 15, the two first perforation 15 are respectively internally provided with a connecting bolt 17, the two connecting bolts 17 respectively penetrate through the corresponding second perforation 16, and one end of the connecting bolt 17 penetrating through the second perforation 16 is in threaded connection with a connecting nut 18.
The ends of the two connecting bolts 17 are provided with anti-rotation planes 19, the big head 3 of the connecting rod is provided with big head anti-rotation surfaces 20, and the anti-rotation planes 19 are attached to the big head anti-rotation surfaces 20, so that the connecting bolts 17 are prevented from rotating when the connecting nuts 18 are screwed.
The connecting rod body 1 is made of medium carbon alloy steel (42 CrMoagb) and is formed by hot pressing and die forging. The fiber direction of the macroscopic metal structure of the longitudinal section of the connecting rod body and the connecting rod cover is along the central line of the connecting rod, and the metallographic structure accords with the 1 grade to 4 grades in GB/T13320-2007. And the weight consistency of each connecting rod is ensured by adopting a hot-pressing section mould forming technology. The medium carbon alloy steel (42 CrMoagb) is adopted as the material to meet the requirements of tensile strength, compressive strength, fatigue strength, rigidity and toughness.
The mechanical property of the engine connecting rod meets the requirements that the tensile strength is more than or equal to 830, the lower yield strength is more than or equal to 650, the elongation after fracture is more than or equal to 12, the area shrinkage is more than or equal to 44, the impact toughness KU2J is more than or equal to 80, the hardness of the connecting rod body 1 and the connecting seat 11 subjected to thermal refining is 207-320 (HB), and the hardness value of the same connecting rod is not more than 35HB.
The connecting structure of the engine connecting rod and the piston rod 22 comprises the piston rod 22 and the engine connecting rod, wherein a first connecting hole 24 is formed in a first connecting end 23 of the piston rod 22, a piston rod bushing 25 is fixed on the inner wall of the first connecting hole 24, the first connecting end 23 is arranged between the two supporting parts 4, and a piston pin 6 penetrates through the piston rod 22 bushing.
Also disclosed is an engine connecting rod assembly process:
the bushing 7 is placed in liquid nitrogen for three minutes, and the bushing 7 is contracted after being placed in the liquid nitrogen, so that the bushing 7 is convenient to be placed in the supporting hole 5;
after the lining 7 is taken out and then is put into the supporting hole 5, the lining 7 is expanded to be in interference connection with the inner wall of the supporting hole 5, the contact area between the lining 7 and the supporting hole 5 is more than 92%, and the requirement of secondary processing of the lining 7 is met;
finish reaming is carried out on the bushing 7 which is installed in the supporting hole 5, and the finish reaming is carried out to the size of an inner hole, so that the assembly process is satisfied;
the piston pin 6 is inserted through the two post-reamed bushings 7 and the piston rod bushing 25 of the piston rod 22;
two circlips 8 are sleeved on ring grooves 9 at two ends of the piston pin 6.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An engine connecting rod, characterized in that: including the connecting rod body, the both ends of connecting rod body are equipped with connecting rod tip and connecting rod big end, the connecting rod tip includes two supporting parts, two all be equipped with the supporting hole on the supporting part, the piston pin has been inserted in the supporting hole, the piston pin can be relative supporting hole lateral shifting, be equipped with anti-drop device on the piston pin, anti-drop device is used for preventing the piston pin is followed the connecting rod tip is gone up to drop.
2. An engine connecting rod as defined in claim 1, wherein: and a bushing is fixed on the inner wall of the supporting hole, the piston pin penetrates through the bushing, and the piston pin can transversely move relative to the bushing.
3. An engine connecting rod as defined in claim 2, wherein: the bushing is an alloy bushing.
4. An engine connecting rod as defined in claim 1, wherein: the anti-drop device is two circlips, the both ends of wrist-pin all are equipped with the annular, two the circlips overlaps respectively and establishes two on the annular, two the interval between the circlips is greater than two the distance between the face that the supporting part is on the back of the body.
5. An engine connecting rod as defined in claim 2, wherein: the fit clearance between the bushing and the piston pin is 0.008-0.02 mm.
6. An engine connecting rod as defined in claim 1, wherein: the connecting rod is characterized in that a first groove is formed in the big end of the connecting rod, a connecting seat is connected to the big end of the connecting rod, a second groove corresponding to the first groove is formed in the connecting seat, a connecting circle is formed in the first groove and the second groove, positioning grooves are formed in the inner wall of the first groove and the inner wall of the second groove, two half axle shoes are installed in the connecting circle, positioning protrusions are arranged on the outer wall of each half axle shoe, and the two positioning protrusions of the half axle shoes are respectively spliced with the two positioning grooves.
7. An engine connecting rod as defined in claim 6, wherein: the connecting rod is characterized in that first through holes are formed in two sides of the big end of the connecting rod, two second through holes corresponding to the two first through holes are formed in two sides of the connecting seat, connecting bolts are arranged in the two first through holes in a penetrating mode, the two connecting bolts respectively penetrate through the corresponding second through holes, and connecting nuts are connected with one ends of the connecting bolts penetrating through the second through holes in a threaded mode.
8. An engine connecting rod as defined in claim 7, wherein: the end parts of the two connecting bolts are respectively provided with an anti-rotation plane, the big end of the connecting rod is provided with a big end anti-rotation surface, and the anti-rotation planes are attached to the big end anti-rotation surfaces.
9. An engine connecting rod as defined in claim 1, wherein: the piston pin is provided as a hollow pin.
10. An engine connecting rod and piston rod connection structure, its characterized in that: comprising a piston rod and an engine connecting rod according to any one of claims 1-9, wherein a first connecting hole is provided in a first connecting end of the piston rod, a piston rod bushing is fixed to an inner wall of the first connecting hole, the first connecting end is provided between the two supporting parts, and the piston pin penetrates the piston rod bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320568592.1U CN219639249U (en) | 2023-03-16 | 2023-03-16 | Engine connecting rod and connecting structure of engine connecting rod and piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320568592.1U CN219639249U (en) | 2023-03-16 | 2023-03-16 | Engine connecting rod and connecting structure of engine connecting rod and piston rod |
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| Publication Number | Publication Date |
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| CN219639249U true CN219639249U (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320568592.1U Active CN219639249U (en) | 2023-03-16 | 2023-03-16 | Engine connecting rod and connecting structure of engine connecting rod and piston rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292587A (en) * | 2023-03-16 | 2023-06-23 | 绍兴思源科技有限公司 | Connecting structure of engine connecting rod, connecting rod and piston rod and assembling process |
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2023
- 2023-03-16 CN CN202320568592.1U patent/CN219639249U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292587A (en) * | 2023-03-16 | 2023-06-23 | 绍兴思源科技有限公司 | Connecting structure of engine connecting rod, connecting rod and piston rod and assembling process |
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