CN203641255U - Structure of engine connecting rod small end - Google Patents
Structure of engine connecting rod small end Download PDFInfo
- Publication number
- CN203641255U CN203641255U CN201320772517.3U CN201320772517U CN203641255U CN 203641255 U CN203641255 U CN 203641255U CN 201320772517 U CN201320772517 U CN 201320772517U CN 203641255 U CN203641255 U CN 203641255U
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- China
- Prior art keywords
- connecting rod
- small end
- rod small
- end hole
- rob bushing
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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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- 230000033001 locomotion Effects 0.000 claims abstract description 18
- 210000000707 wrist Anatomy 0.000 claims description 52
- 238000013461 design Methods 0.000 abstract description 7
- 238000005452 bending Methods 0.000 description 6
- 208000004141 microcephaly Diseases 0.000 description 4
- 238000013475 authorization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000005474 detonation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The utility model discloses a structure of an engine connecting rod small end which comprises a connecting rod small end (1), wherein a connecting rod small end hole (2) is formed in the connecting rod small end; a piston pin (4) is sleeved with the connecting rod small end hole (2), or a connecting rod bushing (3) is arranged in the connecting rod small end hole (2) in a pressing manner; the piston pin (4) is sleeved with the connecting rod bushing (3); the section, perpendicular to the axis of the connecting rod small end hole (2), of the connecting rod small end hole (2) is elliptical, or the section, perpendicular to the axis of an inner hole of the connecting rod bushing (3), of the inner hole of the connecting rod bushing (3) is elliptical; the long axis of the elliptical section is perpendicular to the movement direction of a piston, and the short axis of the elliptical section is parallel to the movement direction of the piston. The structure of the engine connecting rod small end is novel in design, simple, the born specific pressure is reduced, and the reliability of the lateral surface of the connecting rod small end hole is improved.
Description
Technical field
The utility model relates to a kind of connecting rod structure for automobile engine, relates in particular a kind of connecting rod small end of engine structure, belongs to technical field of automobile engine.
Background technique
Connecting rod is the core component of motor, and it comprises connecting rod small end, shaft and connnecting rod big end, and the function of connecting rod is that the power that piston is born is passed to bent axle, and changes the to-and-fro motion of piston into bent axle rotatablely move.Connnecting rod big end is connected with crank pin, rotates together with bent axle.Connecting rod small end is provided with connecting rod small end hole, is conventionally pressed with connecting rob bushing in connecting rod small end hole, and connecting rob bushing is socketed on wrist pin; Do not press-fit connecting rob bushing in connecting rod small end hole time, connecting rod small end hole is directly socketed on wrist pin, and connecting rod small end is reciprocating together with piston, in the process of the power of transmission, plays an important role.When work, wrist pin slides in connecting rob bushing endoporus or in connecting rod small end hole, because Sliding velocity is lower, is unfavorable for forming carrying oil film, poor lubrication, and therefore wrist pin and connecting rob bushing or connecting rod small end hole generation interlock are one of motor most common failures.On the other hand, because connecting rod small end is arranged in piston cavity, be subject in structural limitations, make that connecting rod small end size is little, pressure-bearing surface is little, bearings ratio to press is high; Improving constantly along with motor reinforcing degree simultaneously, motor detonation pressure constantly promotes, the mechanical load that causes piston to bear is more and more higher, this load is delivered to connecting rod by wrist pin, specific pressure on connecting rob bushing or connecting rod small end hole is also constantly increased, specifically referring to Fig. 1-Fig. 2, thereby cause wrist pin to occur bending and deformation and ovalizing deflection, the loaded area of wrist pin and connecting rob bushing endoporus or connecting rod small end hole is reduced greatly, more increase the local specific pressure of connecting rob bushing or connecting rod small end hole, produced hard contact.
Chinese patent notice of authorization number: CN 202280727 U, notice of authorization day: June 20 in 2012, day, were called in the utility model patent of " a kind of connecting rod structure for automobile engine ", a kind of connecting rod structure for automobile engine is disclosed, comprise stub end, shaft and little head end, hold and in endoporus, press-fit lining microcephaly, described lining endoporus is curve near the bus of shaft side, and this curve is to the axial direction projection of lining endoporus.The inner side surface of connecting rod small end end liner trepanning is designed to arc-shaped curved surface by this model utility, the limit bending deflection when shape of generatrix at arc-shaped curved surface place is worked with wrist pin is consistent, thereby the bearing area of wrist pin and lining is increased greatly, reduce the specific pressure that lining bears, improved connecting rod small end of engine end liner cover bearing capacity.But the problem that this model utility has just solved under the stressed bending deflection of wrist pin, wrist pin and connecting rod small end hole produce hard point of contact on axial fitting surface, it does not optimize the adaptability of connecting rod small end hole for wrist pin ovalizing deflection.Higher at motor detonation pressure, in the larger situation of wrist pin generation ovalizing deflection, specifically referring to Fig. 3, in figure there is larger ovalizing deflection in wrist pin 3, the lining endoporus of connecting rod small end 1 or bottom, microcephaly hole can not be with the fine laminating of wrist pin 4 to pass to shaft by mechanical load, and can cause larger stress at the lining endoporus of connecting rod small end 1 or both sides, microcephaly hole, in figure, arrow points represents the direction of transfer of power; And under this contact form, oil film can not well form, the eliminating of micro-bits that are unfavorable for rubbing, the inordinate wear that easily causes connecting rob bushing endoporus or connecting rod small end hole even with wrist pin interlock, serious meeting damages motor.
Summary of the invention
The purpose of this utility model be for existing structure of small end of connecting rod cannot adapt to wrist pin ovalizing deflection, microcephaly's side stressed large, be not easy to form oil film, be unfavorable for getting rid of the problems such as the micro-bits of friction, a kind of connecting rod small end of engine structure is provided.
For achieving the above object, technical solution of the present utility model is: a kind of connecting rod small end of engine structure, comprise connecting rod small end, on described connecting rod small end, be provided with connecting rod small end hole, described connecting rod small end hole is socketed on wrist pin, or in connecting rod small end hole, be pressed with connecting rob bushing, described connecting rob bushing is socketed on wrist pin, in the time that described connecting rod small end hole is socketed on wrist pin, the section perpendicular to its axis of connecting rod small end hole is oval, the major axis of described oval-shaped profile is perpendicular to piston movement direction, and minor axis is parallel to piston movement direction;
In the time being pressed with connecting rob bushing, connecting rob bushing being socketed on wrist pin in connecting rod small end hole, the section perpendicular to its axis of connecting rob bushing endoporus is oval, the major axis of described oval-shaped profile is perpendicular to piston movement direction, and minor axis is parallel to piston movement direction.
Described connecting rod small end hole is 20mm～60mm perpendicular to the minor axis length of the centre section of its axis, and ovality is 0.002～0.06; In the time being pressed with connecting rob bushing, connecting rob bushing being socketed on wrist pin in connecting rod small end hole, connecting rob bushing endoporus is 20mm～60mm perpendicular to the minor axis length of the centre section of its axis, and ovality is 0.002～0.06.
Described connecting rod small end hole is 48mm perpendicular to the minor axis length of the centre section of its axis, and ovality is 0.015; In the time being pressed with connecting rob bushing, connecting rob bushing being socketed on wrist pin in connecting rod small end hole, connecting rob bushing endoporus is perpendicular to the minor axis length 48mm of the centre section of its axis, and ovality is 0.015.
Compared with prior art, the beneficial effects of the utility model are:
1, modern design, simple in structure, reduce the carrying specific pressure of connecting rod small end hole or connecting rob bushing endoporus, improve the reliability of connecting rod small end hole side.In the utility model in the time that connecting rod small end hole is directly socketed on wrist pin, be oval by the Section Design perpendicular to its axis of connecting rod small end hole, when being pressed with connecting rob bushing in connecting rod small end hole, when connecting rob bushing is socketed on wrist pin, be oval by the Section Design perpendicular to its axis of connecting rob bushing endoporus, , and the major axis of oval-shaped profile is perpendicular to piston movement direction, minor axis is parallel to piston movement direction, make under wrist pin ovalizing deflection, wrist pin and connecting rod small end hole or the better laminating of connecting rob bushing endoporus bottom, increase area of contact, reduce carrying specific pressure, mechanical load is more delivered to shaft simultaneously, reduce the force component to connecting rod small end side, improve the reliability of connecting rod small end hole side.
2, in the utility model, by the Section Design perpendicular to its axis of connecting rod small end hole be oval or by the Section Design perpendicular to its axis of connecting rob bushing endoporus for oval, because oval structure has increased the gap of the supporting plane both sides that wrist pin coordinates with connecting rod small end hole or connecting rob bushing endoporus, be easier to form oil film between wrist pin and connecting rod small end hole or lining endoporus lubricated to improve, simultaneously increase lubricant oil excretion, be beneficial to the eliminating of the micro-bits of friction, reduce frictional surface temperature, reduce the even risk of interlock of connecting rod small end hole or lining inordinate wear.
Accompanying drawing explanation
Fig. 1 is wrist pin bending deflection structural representation.
Fig. 2 is wrist pin ovalizing deflection structural representation.
Fig. 3 is circular connecting rod small end hole or connecting rob bushing and the schematic diagram that coordinates of wrist pin ovalizing deflection.
Fig. 4 is the utility model structural representation.
Fig. 5 is the utility model sectional view.
Fig. 6 is connecting rod small end axially bored line and generalized section.
Fig. 7 is the utility model and the schematic diagram that coordinates of wrist pin ovalizing deflection.
In figure: connecting rod small end 1, connecting rod small end hole 2, connecting rob bushing 3, wrist pin 4.
Embodiment
Below in conjunction with accompanying drawing explanation and embodiment, the utility model is described in further detail.
Referring to Fig. 4-Fig. 7, a kind of connecting rod small end of engine structure, comprises connecting rod small end 1, on described connecting rod small end, be provided with connecting rod small end hole 2, described connecting rod small end hole 2 is socketed on wrist pin 4, or is pressed with connecting rob bushing 3 in connecting rod small end hole 2, and described connecting rob bushing 3 is socketed on wrist pin 4.In the time that described connecting rod small end hole 2 is socketed on wrist pin 4, the section perpendicular to its axis of connecting rod small end hole 2 is oval, and specifically referring to Fig. 6, in figure, dotted line is expressed as connecting rod small end hole 2 axis, and solid line is the section perpendicular to connecting rod small end hole 2 axis; The major axis of described oval-shaped profile is perpendicular to piston movement direction, and minor axis is parallel to piston movement direction, and piston movement direction herein refers to along cylinder centerline direction, is vertical direction in motor.In the time being pressed with connecting rob bushing 3, connecting rob bushing 3 being socketed on wrist pin 4 in connecting rod small end hole 2, the section perpendicular to its axis of connecting rob bushing 3 endoporus is oval, the major axis of described oval-shaped profile is perpendicular to piston movement direction, and minor axis is parallel to piston movement direction.Bending deflection and the ovalizing deflection amount of deformation of wrist pin 4 working staties of different type of machines are different, generally connecting rod small end hole 2 is chosen as to 20mm～60mm perpendicular to the minor axis length of the centre section of its axis perpendicular to the minor axis length of the centre section of described connecting rod small end hole 2 axis, ovality is 0.002～0.06; In the time being pressed with connecting rob bushing 3, connecting rob bushing 3 being socketed on wrist pin 4 in connecting rod small end hole 2, generally connecting rob bushing 3 endoporus are chosen as to 20mm～60mm perpendicular to the minor axis length of the centre section of its axis, ovality is 0.002～0.06, perpendicular to the centre section of axis be on axial direction central cross-section, ovality is the poor of oval major axis and minor axis; Specifically, referring to Fig. 5, D1 is oval-shaped major axis, and D0 is oval-shaped minor axis.Further preferred, connecting rod small end hole 2 is 48mm perpendicular to the minor axis length of the centre section of its axis, and ovality is 0.015; In the time being pressed with connecting rob bushing 3, connecting rob bushing 3 being socketed on wrist pin 4 in connecting rod small end hole 2, connecting rob bushing 3 endoporus are perpendicular to the minor axis length 48mm of the centre section of its axis, and ovality is 0.015.
The utility model is oval by the Section Design perpendicular to its axis of the section perpendicular to its axis of connecting rod small end hole 2 or connecting rob bushing 3 endoporus, when elliptical shape and work, wrist pin 4 ovalizing deflections match, like this when after wrist pin 4 stress deformations, wrist pin 4 increases with the area of contact of connecting rob bushing 3 endoporus or connecting rod small end hole 2, the specific pressure that connecting rob bushing 3 endoporus or connecting rod small end hole 2 bear reduces, specifically referring to Fig. 7, connecting rob bushing 3 endoporus loaded areas increase, reduce the force component to connecting rob bushing 3 endoporus sides, increase the gap of the supporting plane both sides that wrist pin coordinates with connecting rod small end hole or connecting rob bushing endoporus, improve lubricated, increasing end lets out, reduce frictional surface temperature.In actual processing, connecting rod small end hole 2 or connecting rob bushing 3 endoporus can be processed as to the oval calotte with gradual change diameter, it is the diameter of axle that the diameter of axle at connecting rod small end hole 2 or connecting rob bushing 3 endoporus middle parts is less than two ends, whole endoporus bus is circular curve, like this, can guarantee to mate with wrist pin 4 bending deflections near the pressure side that bears of shaft side at connecting rod small end hole 2 or connecting rob bushing 3 endoporus, realize the object that specific pressure that connecting rod small end hole 2 or connecting rob bushing 3 endoporus bear reduces.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, said structure all should be considered as belonging to protection domain of the present utility model.
Claims (3)
1. a connecting rod small end of engine structure, comprise connecting rod small end (1), on described connecting rod small end, be provided with connecting rod small end hole (2), described connecting rod small end hole (2) is socketed on wrist pin (4), or in connecting rod small end hole (2), be pressed with connecting rob bushing (3), described connecting rob bushing (3) is socketed on wrist pin (4), it is characterized in that: in the time that described connecting rod small end hole (2) is socketed on wrist pin (4), the section perpendicular to its axis of connecting rod small end hole (2) is oval, the major axis of described oval-shaped profile is perpendicular to piston movement direction, minor axis is parallel to piston movement direction,
Be socketed in wrist pin (4) when upper when be pressed with connecting rob bushing (3), connecting rob bushing (3) in connecting rod small end hole (2), the section perpendicular to its axis of connecting rob bushing (3) endoporus is oval, the major axis of described oval-shaped profile is perpendicular to piston movement direction, and minor axis is parallel to piston movement direction.
2. a kind of connecting rod small end of engine structure according to claim 1, is characterized in that: described connecting rod small end hole (2) is 20mm～60mm perpendicular to the minor axis length of the centre section of its axis, ovality is 0.002～0.06; Be socketed in wrist pin (4) when upper when be pressed with connecting rob bushing (3), connecting rob bushing (3) in connecting rod small end hole (2), connecting rob bushing (3) endoporus is 20mm～60mm perpendicular to the minor axis length of the centre section of its axis, and ovality is 0.002～0.06.
3. a kind of connecting rod small end of engine structure according to claim 2, is characterized in that: described connecting rod small end hole (2) is 48mm perpendicular to the minor axis length of the centre section of its axis, ovality is 0.015; Be socketed in wrist pin (4) when upper when be pressed with connecting rob bushing (3), connecting rob bushing (3) in connecting rod small end hole (2), connecting rob bushing (3) endoporus is perpendicular to the minor axis length 48mm of the centre section of its axis, and ovality is 0.015.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320772517.3U CN203641255U (en) | 2013-12-02 | 2013-12-02 | Structure of engine connecting rod small end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320772517.3U CN203641255U (en) | 2013-12-02 | 2013-12-02 | Structure of engine connecting rod small end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203641255U true CN203641255U (en) | 2014-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320772517.3U Expired - Lifetime CN203641255U (en) | 2013-12-02 | 2013-12-02 | Structure of engine connecting rod small end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203641255U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603863A (en) * | 2013-12-02 | 2014-02-26 | 东风商用车有限公司 | Connecting rod small end structure of engine |
| CN107228647A (en) * | 2016-03-23 | 2017-10-03 | 新昌县达科机电产品设计有限公司 | Piston pin connecting rob bushing gap size positions accessory part |
| CN109386539A (en) * | 2018-12-05 | 2019-02-26 | 潍柴动力股份有限公司 | A kind of connecting rob bushing and a kind of connecting rod ASSY |
| DE102019009183A1 (en) * | 2019-09-30 | 2021-04-01 | Lear Corporation | Seat arrangement with swiveling seat backrest |
| DE102019215064A1 (en) * | 2019-09-30 | 2021-04-01 | Lear Corporation | RIFLE |
| US11691546B2 (en) | 2019-09-30 | 2023-07-04 | Lear Corporation | Seat assembly having a pivotable seat back |
-
2013
- 2013-12-02 CN CN201320772517.3U patent/CN203641255U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603863A (en) * | 2013-12-02 | 2014-02-26 | 东风商用车有限公司 | Connecting rod small end structure of engine |
| CN107228647A (en) * | 2016-03-23 | 2017-10-03 | 新昌县达科机电产品设计有限公司 | Piston pin connecting rob bushing gap size positions accessory part |
| CN109386539A (en) * | 2018-12-05 | 2019-02-26 | 潍柴动力股份有限公司 | A kind of connecting rob bushing and a kind of connecting rod ASSY |
| DE102019009183A1 (en) * | 2019-09-30 | 2021-04-01 | Lear Corporation | Seat arrangement with swiveling seat backrest |
| DE102019215064A1 (en) * | 2019-09-30 | 2021-04-01 | Lear Corporation | RIFLE |
| DE102019009183B4 (en) | 2019-09-30 | 2023-03-23 | Lear Corporation | Seating arrangement with swiveling backrest |
| US11691546B2 (en) | 2019-09-30 | 2023-07-04 | Lear Corporation | Seat assembly having a pivotable seat back |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140611 |