CN113090635A - Engine connecting rod assembly - Google Patents
Engine connecting rod assembly Download PDFInfo
- Publication number
- CN113090635A CN113090635A CN202110350243.8A CN202110350243A CN113090635A CN 113090635 A CN113090635 A CN 113090635A CN 202110350243 A CN202110350243 A CN 202110350243A CN 113090635 A CN113090635 A CN 113090635A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- small
- hole
- head
- bushing
- Prior art date
- 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.)
- Pending
Links
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000001050 lubricating effect Effects 0.000 claims abstract description 8
- 239000010687 lubricating oil Substances 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000005474 detonation Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000005461 lubrication Methods 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2210/00—Applications
- F16N2210/14—Bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses an engine connecting rod assembly, which comprises a connecting rod small head, a small head bushing, a rod body, a connecting rod big head, a bolt and a through hole, wherein the connecting rod small head and the connecting rod big head are respectively arranged at two ends of the rod body; the rod body is provided with a through hole penetrating through the small end of the connecting rod and the large end of the connecting rod, and lubricating oil enters the small end bushing for lubricating and cooling through the through hole of the rod body. Through the mutual matching of the technical schemes, the invention reduces the surface pressure of the connecting rod small-end bushing, improves the pressure distribution and lubrication condition of the bushing, and improves the overall strength of the connecting rod, so that the connecting rod meets the requirement of greatly improved detonation pressure level of an engine, thereby improving the thermal efficiency of the engine and reducing the emission of pollutants.
Description
Technical Field
The invention relates to an engine connecting rod assembly suitable for high detonation pressure, and belongs to the technical field of automobile engines.
Background
The connecting rod assembly is connected with the piston and the crankshaft, and transmits acting force borne by the piston to the crankshaft, so that reciprocating motion of the piston is converted into rotary motion of the crankshaft. In order to improve the thermal efficiency of the engine and meet increasingly stringent emission regulations, the engine needs to continuously increase the explosion pressure. After the explosion pressure rises, the mechanical load of the link assembly rises sharply, and it is necessary to increase the strength thereof greatly. Meanwhile, the surface pressure of the small-head bushing is synchronously increased, and the surface pressure is difficult to be increased only by optimizing the bushing material. At present, a small end of a connecting rod of an engine is lubricated mostly in modes of an oil collecting hole, an oil groove, splashing and the like, and stable and good lubricating and cooling are difficult to form.
Disclosure of Invention
The invention aims to solve the technical problem of providing an engine connecting rod assembly aiming at the defects in the prior art.
In order to solve the technical problem, the invention provides an engine connecting rod assembly which comprises a connecting rod small head, a small head bushing, a rod body, a connecting rod big head, a bolt and a through hole, wherein the connecting rod small head and the connecting rod big head are respectively arranged at two ends of the rod body; the rod body is provided with a through hole penetrating through the small end of the connecting rod and the large end of the connecting rod, and lubricating oil enters the small end bushing for lubricating and cooling through the through hole of the rod body.
The small end of the connecting rod adopts a step-type structure, the width e2 of the lower side is larger than the width e1 of the upper side, and the areas of a bearing area at the lower end of the small end of the connecting rod and a bearing area at the upper end of the piston pin hole are synchronously increased.
The connecting rod big end is processed by adopting an expanding and breaking process and adopts a bevel cut structure, the connecting rod big end cover is arranged on the connecting rod big end and is detachably connected through a bolt, and an included angle alpha exists between the connecting rod big end cover and the dividing plane of the connecting rod body and the horizontal direction.
And processing special-shaped molded lines on the inner surface of the small-end bushing, wherein the molded lines are symmetrical about a connecting rod central plane D-D, the 0 point is positioned at the central position of the connecting rod, 0-E are cylindrical sections, and E-F are special-shaped hole sections.
The cross section of the shaft body is of an I-shaped structure, and the thickness c1 of one side, close to the through hole, of the cross section is larger than the thickness c2 of the other side; the thickness d of the shaft is greatest at the intermediate position d2 and decreases near the lateral positions d1 and d 3.
The through hole is arranged on one side of the I-shaped rod body, the center 61 of the through hole at the small end of the connecting rod deviates from the center line of the connecting rod by a distance a, and the center 62 of the through hole at the large end of the connecting rod deviates from the center line of the connecting rod by a distance b.
Has the advantages that: through the mutual matching of the technical schemes, the invention reduces the surface pressure of the connecting rod small-end bushing, improves the pressure distribution and lubrication condition of the bushing, and improves the overall strength of the connecting rod, so that the connecting rod meets the requirement of greatly improved detonation pressure level of an engine, thereby improving the thermal efficiency of the engine and reducing the emission of pollutants.
Drawings
FIG. 1 is a front view of the present invention in a schematic configuration;
FIG. 2 is a schematic side view of the structure of the present invention;
FIG. 3 is a cross-sectional view H-H in a schematic side view of the structure of the present invention;
FIG. 4 is a schematic structural view of a small end of a connecting rod and a piston pin boss according to the present invention;
FIG. 5 is a schematic view of a profile line of the small end of the connecting rod of the present invention.
In the figure: 1 connecting rod small end, 2 small end bush, 3 rod body, 4 connecting rod big end, 5 bolt, 6 through hole, 61 connecting rod small end through hole center, 62 connecting rod big end through hole center; the device comprises a connecting rod small-end side rod body through hole offset connecting rod center line distance, a connecting rod large-end side rod body through hole offset connecting rod center line distance, a rod c cross section I-shaped width, a rod D width, a connecting rod small-end width, a piston pin boss width F, an included angle between an alpha large-end oblique notch and the horizontal direction, a D-D connecting rod center plane, an E molded line starting point, an F small-end bushing outer side and a G-G connecting rod small-end axis.
Detailed Description
The invention is further described with reference to the following figures and examples.
The invention provides an engine connecting rod assembly, which comprises a connecting rod small head 1, a small head bushing 2, a rod body 3, a connecting rod big head 4, a bolt 5 and a through hole 6, wherein the connecting rod small head 1 and the connecting rod big head 4 are respectively arranged at two ends of the rod body 3, the connecting rod small head bushing 2 is pressed into the connecting rod small head 1 by adopting a certain interference magnitude, and the interference magnitude is comprehensively determined according to the inner diameter of the connecting rod small head, a bushing material and the like; the rod body 3 is provided with a through hole 6 penetrating through the small end 1 and the large end 4 of the connecting rod, lubricating oil enters the small end bushing 2 through the through hole 6 of the rod body 3 for lubricating and cooling, and the rod body is matched with the special-shaped profile line of the small end bushing of the connecting rod to ensure reliable and sufficient lubrication of the small end of the connecting rod under various working conditions, improve the lubricating and cooling with a piston pin and reduce the friction work and the pin hole occlusion risk.
The connecting rod small head 1 adopts a step-shaped structure, the width e2 of the lower side is greater than the width e1 of the upper side, and a piston pin seat matched with the connecting rod small head can be designed to be that the width f1 of the upper end is greater than the width f2 of the lower end; the areas of the bearing area at the lower end of the small end of the connecting rod and the bearing area at the upper end of the piston pin hole are synchronously increased, and the surface pressure is reduced.
The inner surface of the small-end bush 2 is provided with a special-shaped profile line rotating around the axis G-G of the small end of the connecting rod, the profile line is symmetrical about the central plane D-D of the connecting rod, the 0 point is positioned at the central plane of the connecting rod, wherein 0-E are cylindrical sections, and the diameter of each cylindrical section is slightly larger than that of the piston pin; E-F are special-shaped hole sections, the diameter of the inner hole of the bushing is gradually increased, and the pressure distribution and the lubricating cooling on the surface of the bushing are improved; the increase of the inner diameter y is calculated according to the functional equation y as Ax2Calculating + Bx + C; the value F is half of the width e2 of the lower end of the small end of the connecting rod, and the value E, A, B, C is determined according to EHD analysis of the small end of the connecting rod; through molded lines design, the minimum oil film thickness between the bushing and the piston pin can be effectively increased, the maximum oil pressure, thermal load and edge load of the bushing are reduced, and the lubricating cooling and anti-seizure capacity under high detonation pressure is improved.
The H-H section of the shaft 3 is of an I-shaped structure, and the thickness c1 of one side, close to the through hole 6, of the section is larger than the thickness c2 of the other side; the thickness d of the shaft 3 is maximum at the intermediate position d2 and decreases at positions d1 and d3 near both sides; c. d is obtained by finite element calculation simulation; through the differentiated design of the sizes of all positions of the rod body, the weight of the connecting rod can be greatly reduced while the strength and the buckling stability of the connecting rod are improved, so that the reciprocating inertia force and the rotating inertia force are reduced.
The connecting rod big end 4 is provided with a connecting rod big end cover, and the joint surface of the connecting rod body and the connecting rod cover is in a three-dimensional staggered characteristic by adopting the expanding and breaking process, so that the assembling and positioning precision of the connecting rod cover and the connecting rod body is improved, the anti-shearing bearing capacity of the connecting rod assembly is effectively improved, and the production cost of the connecting rod assembly is reduced; the connecting rod big head 4 adopts a diagonal cut structure, an included angle alpha exists between the dividing surfaces of the connecting rod big head cover and the connecting rod body and the horizontal direction, the inner diameter of the connecting rod big head is increased as much as possible while the requirement of installation space is met, and therefore the strength of a connecting rod assembly and the strength of a crank throw of a crankshaft are increased; the connecting rod big head cover is detachably connected through a bolt 5; the strength grade of the bolt is 11.9 grade, the total friction coefficient is limited in a specified interval, the threads are produced by adopting a rolling process and are screwed up by a torque and angle method, so that the designed pre-tightening force is achieved, and the overall strength of the big end of the connecting rod is increased.
The through hole 6 is arranged on one side of the I-shaped rod body, the center 61 of the through hole at the small end of the connecting rod deviates from the distance a of the central line of the connecting rod, and the center 62 of the through hole at the large end of the connecting rod deviates from the distance b of the central line of the connecting rod, so that the largest pressure bearing area of the large end and the small end is avoided, and the abrasion at oil holes of the bushing of the small end of the. The value of a is usually determined from finite element calculations, and the value of b is determined by comprehensively considering the wall thickness of the through-hole in the shaft.
The above-described embodiments of the invention are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (6)
1. An engine connecting rod assembly, characterized by: the connecting rod comprises a connecting rod small head (1), a small head bushing (2), a rod body (3), a connecting rod large head (4), a bolt (5) and a through hole (6), wherein the connecting rod small head (1) and the connecting rod large head (4) are respectively arranged at two ends of the rod body (3), and the connecting rod small head bushing (2) is pressed into the connecting rod small head (1) by interference; the connecting rod is characterized in that a through hole (6) penetrating through the small connecting rod head (1) and the large connecting rod head (4) is formed in the rod body (3), and lubricating oil enters the small head bushing (2) through the through hole (6) of the rod body (3) for lubricating and cooling.
2. The engine connecting rod assembly of claim 1, wherein: the small end (1) of the connecting rod adopts a step-type structure, the width e2 of the lower side is larger than the width e1 of the upper side, and the areas of a bearing area at the lower end of the small end of the connecting rod and a bearing area at the upper end of a piston pin hole are synchronously increased.
3. The engine connecting rod assembly of claim 1, wherein: the connecting rod big end (4) is processed by adopting an expansion-fracture process and adopts an inclined notch structure, the connecting rod big end (4) is provided with a connecting rod big end cover, the connecting rod big end cover is detachably connected through a bolt (5), and an included angle alpha exists between the connecting rod big end cover and the dividing surface of the connecting rod body and the horizontal direction.
4. The engine connecting rod assembly of claim 1, wherein: and the inner surface of the small-end bushing (2) is processed with a special-shaped profile, wherein 0-E are cylindrical sections, and E-F are special-shaped hole sections.
5. The engine connecting rod assembly of claim 1, wherein: the cross section of the shaft body (3) is of an I-shaped structure, and the thickness c1 of one side, close to the through hole (6), of the cross section is larger than the thickness c2 of the other side; the thickness d of the shaft (3) is largest at the intermediate position d2 and is reduced near both side positions d1 and d 3.
6. The engine connecting rod assembly of any one of claims 1-5, wherein: the through hole 6 is arranged on one side of the I-shaped rod body, the center 61 of the through hole at the small end of the connecting rod deviates from the center line of the connecting rod by a distance a, and the center 62 of the through hole at the large end of the connecting rod deviates from the center line of the connecting rod by a distance b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350243.8A CN113090635A (en) | 2021-03-31 | 2021-03-31 | Engine connecting rod assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350243.8A CN113090635A (en) | 2021-03-31 | 2021-03-31 | Engine connecting rod assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113090635A true CN113090635A (en) | 2021-07-09 |
Family
ID=76673177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350243.8A Pending CN113090635A (en) | 2021-03-31 | 2021-03-31 | Engine connecting rod assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113090635A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086901A (en) * | 2009-12-05 | 2011-06-08 | 苏州麦格特发动机有限公司 | Structural improvement of engine connecting rod |
| CN202215575U (en) * | 2011-08-08 | 2012-05-09 | 东风康明斯发动机有限公司 | Engine cracking connection rod with V-shaped lubrication oil groove |
| CN203809243U (en) * | 2014-04-15 | 2014-09-03 | 上海大隆机器厂有限公司 | Connecting rod for compressor with piston force of 100 tons |
| CN204805303U (en) * | 2015-08-10 | 2015-11-25 | 广西玉柴机器股份有限公司 | Engine connecting rod |
| CN107120432A (en) * | 2017-05-08 | 2017-09-01 | 中国第汽车股份有限公司 | A kind of low friction end bushing connecting rod piston latch structure |
| CN210013931U (en) * | 2018-12-28 | 2020-02-04 | 长城汽车股份有限公司 | Connecting rod structure and variable compression ratio engine |
-
2021
- 2021-03-31 CN CN202110350243.8A patent/CN113090635A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086901A (en) * | 2009-12-05 | 2011-06-08 | 苏州麦格特发动机有限公司 | Structural improvement of engine connecting rod |
| CN202215575U (en) * | 2011-08-08 | 2012-05-09 | 东风康明斯发动机有限公司 | Engine cracking connection rod with V-shaped lubrication oil groove |
| CN203809243U (en) * | 2014-04-15 | 2014-09-03 | 上海大隆机器厂有限公司 | Connecting rod for compressor with piston force of 100 tons |
| CN204805303U (en) * | 2015-08-10 | 2015-11-25 | 广西玉柴机器股份有限公司 | Engine connecting rod |
| CN107120432A (en) * | 2017-05-08 | 2017-09-01 | 中国第汽车股份有限公司 | A kind of low friction end bushing connecting rod piston latch structure |
| CN210013931U (en) * | 2018-12-28 | 2020-02-04 | 长城汽车股份有限公司 | Connecting rod structure and variable compression ratio engine |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210709 |