CN207111258U - The attachment structure of piston rod - Google Patents
The attachment structure of piston rod Download PDFInfo
- Publication number
- CN207111258U CN207111258U CN201721042819.XU CN201721042819U CN207111258U CN 207111258 U CN207111258 U CN 207111258U CN 201721042819 U CN201721042819 U CN 201721042819U CN 207111258 U CN207111258 U CN 207111258U
- Authority
- CN
- China
- Prior art keywords
- hole
- pin
- section
- connecting rod
- bearing pin
- 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.)
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- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000010687 lubricating oil Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000314 lubricant Substances 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract description 4
- 230000009931 harmful effect Effects 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
Abstract
The utility model discloses a kind of attachment structure of piston rod, including connecting rod, one end of connecting rod is connected with engine crankshaft, the other end of connecting rod is provided with the hole heart line pin-and-hole vertical with the length direction of connecting rod, the stage casing of bearing pin is rotatably assorted with pin-and-hole composition and both ends are connected with piston holder, described pin-and-hole is oval cross section perpendicular to the section of its own hole heart line, and the short axle of oval cross section is parallel with the length direction of connecting rod, and minor axis length is equal with the diameter of bearing pin.Bearing pin is also changed into class ellipticity in its section after bending is operated, at this moment the major axis of the oval cross section of pin-and-hole leaves enough deformation spaces to bearing pin more than the diameter of bearing pin, and now the short axle of the oval cross section of pin-and-hole is more than the short axle of the class oval cross section of the bearing pin after deformation, ensure that leaving enough gaps all the time between pin-and-hole and bearing pin allows lubricating oil to enter, compensate for difference of hardness between pin-and-hole and bearing pin, away from big caused harmful effect, strengthens lubricant effect.
Description
Technical field
The utility model belongs to automotive engine applications, more particularly to a kind of attachment structure of piston rod.
Background technology
In automobile engine transmission, connecting rod one end, which offers pin-and-hole and bearing pin and formed, to be rotatably assorted, the both ends of bearing pin and
The support connection that piston base is set, the other end of connecting rod are connected with engine crankshaft rotation, and engine crankshaft rotation traction connects
Bar in cylinder body with piston so that do straight reciprocating motion.In the prior art, the connected mode of bearing pin and pin-and-hole is more using complete
Floating structure, it has the characteristics of bigger bearing capacity, bearing pin axial direction even wearing, in order to strengthen the lubrication between bearing pin and pin-and-hole
Effect, reduce frictional force, bearing pin outer surface carry out DLC processing, DLC coatings (diamond-like coating) itself with high rigidity,
The good characteristics such as low friction, wear-resistant, it has also become the selection of major main engine plants.But the DLC coating hardness on bearing pin surface is
2500HV or so, the hardness of connecting rod is 280HV or so, and both hardness differences are very big, so as to cause the friction pair of both compositions
Friction durability is low, and both constantly add lubricant in operation process can improve the influence of difference of hardness.At present, for the ease of
Lubricating oil enters, and bearing pin and pin-and-hole coordinate in assembling for clearance-type, and both the excessive relative rotations of the minimum otherwise gap in gap
When abnormal sound can occur.Pin-and-hole is circular, but bearing pin will be born greatly along the shaft length direction of connecting rod in the course of the work
Power, it may occur that bending so as to cause section be changed into class ellipse, transverse diameter gradually increases, so as to cause bearing pin
Diminish with the gap of pin-and-hole so that lubricating oil film is not easy to be formed, and lubricant effect difference causes to damage to workpiece.
Utility model content
The purpose of this utility model is to provide a kind of attachment structure of piston rod, in the case of bearing pin working deformation
Pin-and-hole can also provide enough gaps and be easy to lubricating oil to enter, and strengthen lubricant effect.
To achieve these goals, the utility model takes following technical scheme：A kind of attachment structure of piston rod, bag
Connecting rod is included, one end of connecting rod is connected with engine crankshaft, and the other end of connecting rod is vertical with the length direction of connecting rod provided with hole heart line
Pin-and-hole, the stage casing of bearing pin and pin-and-hole, which are formed, to be rotatably assorted and both ends are connected with piston holder, described pin-and-hole perpendicular to it
The section of itself hole heart line is oval cross section, and the short axle of oval cross section is parallel with the length direction of connecting rod, minor axis length and pin
The diameter of axle is equal.
In above-mentioned technical proposal, the section of pin-and-hole forms clearance-type with bearing pin for ellipticity and coordinated, and bearing pin deforms in operating
Its section is also changed into class ellipticity after bending, and at this moment the major axis of the oval cross section of pin-and-hole leaves foot more than the diameter of bearing pin to bearing pin
Enough deformation spaces, and now the short axle of the oval cross section of pin-and-hole is more than the short axle of the class oval cross section of the bearing pin after deformation,
Ensure that leaving enough gaps all the time between pin-and-hole and bearing pin allows lubricating oil to enter, compensate between pin-and-hole and bearing pin difference of hardness away from
Harmful effect caused by big, strengthen lubricant effect.
Brief description of the drawings
Fig. 1 is the utility model schematic perspective view；
Fig. 2 is sectional view of the utility model parallel to length of connecting rod direction；
Fig. 3 is sectional view of the utility model perpendicular to length of connecting rod direction.
Embodiment
Made further instructions with reference to 1~3 pair of the utility model of accompanying drawing：
A kind of attachment structure of piston rod, including connecting rod 10, one end of connecting rod 10 are connected with engine crankshaft, connecting rod 10
The other end be provided with the hole heart line pin-and-hole 20 vertical with the length direction of connecting rod 10, stage casing and the pin-and-hole 20 of bearing pin 30 form rotation
Coordinate and both ends be connected with piston holder, described pin-and-hole 20 perpendicular to the section of its own hole heart line be oval cross section, and
The short axle of oval cross section is parallel with the length direction of connecting rod 10, and minor axis length is equal with the diameter of bearing pin 30.The section of pin-and-hole 20
Clearance-type being formed for ellipticity and bearing pin 30 to coordinate, bearing pin 30 is also changed into class ellipticity in its section after bending is operated, this
When pin-and-hole 20 the major axis of oval cross section be more than the diameter of bearing pin 30 enough deformation spaces left to bearing pin 30, and now sell
The short axle of the oval cross section in hole 20 is more than the short axle of the class oval cross section of the bearing pin 30 after deformation, ensure pin-and-hole 20 and bearing pin 30 it
Between leave enough gaps all the time and allow lubricating oil to enter, compensate between pin-and-hole 20 and bearing pin 30 difference of hardness away from caused by big not
Good influence, strengthen lubricant effect.
The oval cross section at the both ends parallel to the median plane of the length direction of connecting rod 10 to pin-and-hole 20 of described pin-and-hole 20
Major axis gradually increases.It is gradually reduced, is easy to from the both ends of pin-and-hole 20 to the gap between pin-and-hole median plane 20 and bearing pin 30
The remittance of lubricating oil, while lubricating oil is decreased by the speed in gap, oil film is more readily formed in this process, increases
Strong lubricant effect.
The oval cross section at the both ends parallel to the median plane of the length direction of connecting rod 10 to pin-and-hole 20 of described pin-and-hole 20
Ovality is 0.002~0.006.It is poor to limit major axis and the short axle of oval cross section, major axis is excessive to cause pin-and-hole 20 and bearing pin 30
Cooperation is excessively loosened, and enough distortion allowances are left to bearing pin 30, avoid surplus it is excessive cause to collide in operation process it is different
Ring.
The oval cross section at the both ends parallel to the median plane of the length direction of connecting rod 10 to pin-and-hole 20 of described pin-and-hole 20
Bus where the end points of major axis is curve-like.Make the inner surface more continuous and derivable of pin-and-hole 20, at the same with the deformation phase of bearing pin 30
Adapt to, be easy to there are enough gaps to allow lubricating oil to enter.
The oval cross section at the both ends parallel to the median plane of the length direction of connecting rod 10 to pin-and-hole 20 of described pin-and-hole 20
Bus where the end points of major axis meets Hyperbolic Equation feature.Pin-and-hole 20 and bearing pin 30 are simulated by CAE Structural Performance Analysis
Coordinate operating, make bus meet Hyperbolic Equation be more beneficial for pin-and-hole 20 meet bearing pin 30 deform while allow lubricating oil enter between
Gap.
Claims (5)
1. a kind of attachment structure of piston rod, including connecting rod (10), one end of connecting rod (10) are connected with engine crankshaft, connecting rod
(10) the other end is provided with the hole heart line pin-and-hole (20) vertical with the length direction of connecting rod (10), the stage casing of bearing pin (30) and pin-and-hole
(20) composition is rotatably assorted and both ends are connected with piston holder, it is characterised in that：Described pin-and-hole (20) perpendicular to its own
The section of hole heart line is oval cross section, and the short axle of oval cross section is parallel with the length direction of connecting rod (10), minor axis length and pin
The diameter of axle (30) is equal.
2. the attachment structure of piston rod according to claim 1, it is characterised in that：Described pin-and-hole (20) parallel to
The major axis of the median plane of connecting rod (10) length direction to the oval cross section at the both ends of pin-and-hole (20) gradually increases.
3. the attachment structure of piston rod according to claim 2, it is characterised in that：Described pin-and-hole (20) parallel to
The ovality of the median plane of connecting rod (10) length direction to the oval cross section at the both ends of pin-and-hole (20) is 0.002~0.006.
4. the attachment structure of piston rod according to claim 3, it is characterised in that：Described pin-and-hole (20) parallel to
Bus where the median plane of connecting rod (10) length direction to the end points of the major axis of the oval cross section at the both ends of pin-and-hole (20) is curve
Shape.
5. the attachment structure of piston rod according to claim 4, it is characterised in that：Described pin-and-hole (20) parallel to
Bus meets double where the median plane of connecting rod (10) length direction to the end points of the major axis of the oval cross section at the both ends of pin-and-hole (20)
Curvilinear equation feature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721042819.XU CN207111258U (en) | 2017-08-18 | 2017-08-18 | The attachment structure of piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721042819.XU CN207111258U (en) | 2017-08-18 | 2017-08-18 | The attachment structure of piston rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207111258U true CN207111258U (en) | 2018-03-16 |
Family
ID=61577009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721042819.XU Active CN207111258U (en) | 2017-08-18 | 2017-08-18 | The attachment structure of piston rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207111258U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837803A (en) * | 2022-05-26 | 2022-08-02 | 奇瑞汽车股份有限公司 | Crankshaft connecting rod and engine |
-
2017
- 2017-08-18 CN CN201721042819.XU patent/CN207111258U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837803A (en) * | 2022-05-26 | 2022-08-02 | 奇瑞汽车股份有限公司 | Crankshaft connecting rod and engine |
| CN114837803B (en) * | 2022-05-26 | 2023-05-26 | 奇瑞汽车股份有限公司 | Crankshaft connecting rod and engine |
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