CN115681302A - Connecting rod with efficient oil collecting hole - Google Patents
Connecting rod with efficient oil collecting hole Download PDFInfo
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- CN115681302A CN115681302A CN202211328458.0A CN202211328458A CN115681302A CN 115681302 A CN115681302 A CN 115681302A CN 202211328458 A CN202211328458 A CN 202211328458A CN 115681302 A CN115681302 A CN 115681302A
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- connecting rod
- oil
- boss
- collecting hole
- lubricating oil
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- 239000003921 oil Substances 0.000 claims abstract description 105
- 239000010687 lubricating oil Substances 0.000 claims abstract description 49
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 13
- 238000002679 ablation Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a connecting rod with an efficient oil collecting hole. The invention can effectively increase the amount of lubricating oil entering the connecting rod small end-piston pin swing friction pair and prolong the service life of the friction pair. The invention is provided with a lug boss at the periphery of the oil collecting hole along the incoming flow direction of the splashed lubricating oil; and an oil guide structure is arranged between the boss and the oil collecting hole. On the basis of not adding movable parts and not influencing the mechanical strength of the connecting rod, the invention can effectively increase the amount of lubricating oil entering the connecting rod small end-piston pin swing friction pair by only carrying out small-amplitude adjustment on the design of the existing connecting rod, improve the lubricating oil supply condition of the connecting rod small end-piston pin swing friction pair and solve the problems of insufficient lubricating oil supply, high friction loss, low service life, adhesion, ablation, occlusion and the like of the existing friction pair.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a connecting rod with a high-efficiency oil collecting hole.
Background
In a power system of a vehicle power engine, a connecting rod of the engine is one of important parts for transmission and bearing, wherein a large end of the connecting rod is connected to a crankshaft through a crank pin, a small end of the connecting rod is connected to a piston through a piston pin to jointly form a crank-connecting rod mechanism, and the cyclic reciprocating motion of the piston is converted into the rotary motion of the crankshaft to complete the power transmission process of the engine.
In the power transmission process, the small end of the connecting rod and the piston pin jointly form a swing friction pair, the piston pin transmits the thrust of the cylinder to the piston to the small end of the connecting rod through the friction pair, and the friction pair bears the reciprocating inertia force of the piston and the swing moment of the friction pair in the swing process, so that the working environment is very severe. Because of the special position of the friction pair, the connecting rod small end-piston pin swing friction pair usually cannot directly supply lubricating oil through an engine lubricating oil channel, but lubricating oil sprayed by a piston cooling nozzle or lubricating oil sprayed by a crankshaft, a connecting rod and other structures impact an oil pan to indirectly splash into the oil collecting hole to realize lubricating oil supply by designing an oil collecting hole and an oil storage tank on the connecting rod small end, but compared with other pressure oil supply, the oil supply mode hardly meets the requirement of sufficient lubricating oil supply of the connecting rod small end-piston pin swing friction pair. Although the service life of the connecting rod small head-piston pin swing friction pair can basically meet the requirements of most engine models, with the continuous improvement of the index requirements of engineering practice on engine power density, light weight, compactness and the like, for example, a high-power density diesel engine and the like, the alternating load borne by the connecting rod small head-piston pin swing friction pair is far higher than the working load of a common engine, under the existing friction pair lubrication condition, the working environment becomes worse, so that the phenomena of serious ablation, abrasion, occlusion and the like occur between the connecting rod small head and the piston pin, and the service life of the friction pair and the reliability of the engine are greatly reduced.
In the prior art, the service life of the connecting rod small end-piston pin swing friction pair is prolonged mainly by improving two aspects of lubricating conditions and material characteristics. In the aspect of improving the lubricating condition, three main schemes exist, the first scheme is to arrange an oil supply oil way in the center of the connecting rod and directly introduce the lubricating oil at the large end of the connecting rod into the small end of the connecting rod to realize pressure oil supply, but the oil supply pressure provided by the method is limited, and due to the hollow design of the connecting rod, the structure cannot bear large load, so that the use of the design in a high-power-density machine type is greatly limited; the second scheme is that an oil collecting oil hole is arranged at the small end of the connecting rod, and lubricating oil supply of the connecting rod small end-piston pin swing friction pair is realized by collecting the engine oil sprayed by a piston cooling nozzle or the engine oil splashed by the impact of a main shaft on an oil pan; the third scheme is that an oil storage groove is arranged on a connecting rod small end bushing on the basis of arranging an oil collecting oil hole on a connecting rod small end, so that the oil storage capacity of the friction pair is improved to a certain extent, but the scheme cannot provide sufficient and effective lubricating conditions for the connecting rod small end-piston pin swing friction pair due to the fact that the oil collecting capacity of the oil hole is poor. In the aspect of improving material characteristics, because an effective lubricating oil film cannot be formed, a dry friction phenomenon inevitably occurs in a connecting rod small end-piston pin swinging and rotating friction pair, which is a main reason for causing problems of abrasion, ablation, adhesion and the like of the friction pair.
Disclosure of Invention
In view of this, the invention provides a connecting rod with an efficient oil collecting hole, which can effectively increase the amount of lubricating oil entering a small end-piston pin swing friction pair of the connecting rod, and improve the service life of the friction pair.
The connecting rod with the efficient oil collecting hole is characterized in that the oil collecting hole is formed in the small end of the connecting rod, and the boss is arranged on the periphery of the oil collecting hole along the incoming flow direction of splashed lubricating oil; an oil guide structure is arranged between the lug boss and the oil collecting hole.
Preferably, a certain space is left between the boss and the piston dome.
Preferably, the shape of the boss is: a square, a rectangle, a trapezoid or any other shape with an intercepting area in the incoming flow direction of the splashed lubricating oil; the boss is a single plate or has a certain thickness.
Preferably, the boss is: the oil collecting hole extends outwards along the oil hole.
Preferably, the splash lubrication oil blocking section of the boss is an inclined plane, and the inclined plane is the oil guide structure.
Preferably, the oil collecting hole is a single oil hole or a plurality of oil holes, and the boss is arranged at each oil collecting hole.
Has the advantages that:
(1) On the basis of fully considering the flow field characteristic of splashing lubricating oil, the invention improves the capture capacity and the collection capacity of the oil collecting hole to the lubricating oil by arranging the boss structure at the periphery of the oil collecting hole, can effectively increase the amount of the lubricating oil entering the connecting rod small head-piston pin swing friction pair on the basis of not influencing the mechanical strength of the connecting rod, solves the problems of insufficient supply of the lubricating oil, high friction loss, low service life, adhesion, ablation, occlusion and the like of the conventional friction pair, and improves the lubricating characteristic of the connecting rod small head-piston pin swing friction pair. On the basis of no addition of movable parts and no influence on the mechanical strength of the connecting rod, the lubricating oil supply condition of the connecting rod small-end-piston pin swing friction pair can be greatly improved only by carrying out small-amplitude adjustment on the existing connecting rod design.
(2) The shape of the boss is not limited, and only the intercepting area is needed in the incoming flow direction of the splashed lubricating oil; the thickness of the boss is not limited, and the boss can be a single plate or a plate with a certain thickness, so that the boss is easy to realize. A certain space is reserved between the boss and the piston dome, so that the problem of interference between the connecting rod and the piston due to movement or temperature rise is effectively avoided. The intercepting surface of the boss is arranged to be the inclined surface, the intercepted splashing lubricating oil can directly flow into the oil collecting hole along the inclined surface, other oil guide structures do not need to be additionally arranged, and the structure is simple and easy to achieve.
(3) The boss is formed in the oil collecting hole in the mode of extending outwards along the oil hole, the implementation mode is simple, and intercepted lubricating oil can be ensured to effectively flow into the oil collecting hole.
Drawings
FIG. 1 is a three-dimensional view of the connecting rod of the present invention.
Fig. 2 is a half sectional view and a partially enlarged view of the connecting rod of the present invention.
FIG. 3 is a curve of the cumulative oil inlet amount of each oil hole of the improved front and rear connecting rods.
Wherein, 1-connecting rod main body; 2-oil collecting hole boss; 3-slope inclined plane; 4-oil collecting holes; and 5-an oil storage tank.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a connecting rod with an efficient oil collecting hole.
In the research of the process of splashing the lubricating oil at the small end of the connecting rod, the invention discovers that most of the lubricating oil sprayed out of the piston cooling nozzle can be directly sprayed into the piston cooling oil cavity in the working process of the connecting rod, and only a small part of the lubricating oil can be sprayed onto the piston dome due to the spraying angle and the movement of the piston. And the portion of the lubricating oil injected into the piston dome is relatively low in viscosity due to the heating of the piston dome. Meanwhile, when the piston moves, the lubricating oil collides on one side of the piston dome and moves towards the center of the piston dome, the moving direction of the lubricating oil gradually becomes parallel to the curved surface of the piston dome under the blockage of the piston dome, and then moves towards the side without the piston cooling nozzle and finally falls back to the oil pan along the cylinder wall. The motion speed parallel to the piston dome also makes lubricating oil difficult to effectively fall into the oil hole of the connecting rod, so most of the lubricating oil can directly cross the upper part of the oil collecting hole of the connecting rod and fall back to the oil pan, the oil collecting hole can not effectively collect the lubricating oil splashed to the piston dome by the piston cooling nozzle, and the quantity of the lubricating oil which can be obtained by the connecting rod small-head piston pin swinging friction pair is greatly reduced.
Because the lubricating oil splashed to the small end of the connecting rod by the piston cooling nozzle almost closely clings to the piston dome at a speed parallel to the curved surface of the piston dome to move from the position close to the piston cooling nozzle to the position far away from the piston cooling nozzle, only a small part of the lubricating oil can enter the oil collecting hole, and therefore in order to effectively intercept the splashed lubricating oil, the boss with a certain height is arranged at the position of the oil collecting hole to form an effective interception section, the shape and the thickness of the boss are not limited, but the projection of the interception section in the incoming flow direction is an effective interception area, so the interception section of the boss is positioned on the incoming flow incident face of the splashed lubricating oil as far as possible, and the effective interception area is increased as far as possible. For convenient processing and reducing the structural change as much as possible, the oil collecting hole can be directly extended outwards along the oil hole to form a boss, so that an effective blocking section is formed for splashed lubricating oil, and the effect of improving the oil collecting efficiency of the oil collecting hole is achieved. Meanwhile, the lug boss can be arranged as an inclined plane, and the inclined plane can be directly used as a flow guide structure, so that the additional parts are avoided. Taking a certain type of connecting rod with two oil holes as an example, under the working condition of the rotating speed of 2500rpm, as shown in table 1 and fig. 1, the average oil inlet amount per unit time of the original connecting rod is 5.40mL/min, the average oil inlet amount per unit time of the connecting rod after the oil collecting hole extends outwards to form a semi-cylindrical hollow boss structure is 132.51mL/min, the average oil inlet amount per unit time of the improved connecting rod is approximately 24.5 times of the average oil inlet amount per unit time of the original design and is far higher than the oil inlet amount of a common connecting rod with the oil hole, the oil collecting efficiency of the oil collecting hole of the connecting rod is greatly improved, and better and more sufficient lubricating conditions are provided for a connecting rod small head-piston pin swing friction pair.
TABLE 1 improvement of oil supply condition of each oil hole of front and rear connecting rods
The invention discloses a connecting rod with an efficient oil collecting hole. When the height of the oil collecting hole boss is set, a certain space is ensured to be left between the boss and the piston dome, so that the problem of interference between the connecting rod and the piston due to movement or temperature rise is avoided; the boss structure should be designed with a certain temporary storage space for lubricating oil as much as possible, for example, the hollow design of the semi-cylindrical hollow boss can prevent the lubricating oil from flowing out of the blocking section from the two sides of the boss again when the lubricating oil does not enter the oil collecting hole; the size of the boss structure is usually larger than or equal to the diameter of the oil collecting hole of the connecting rod, and a certain oil guide structure, such as a slope inclined surface, is reserved between the boss structure and the oil collecting hole, so that the design is beneficial to more effectively and quickly flowing lubricating oil into the oil collecting hole and the oil storage tank, and the oil collecting efficiency of the oil collecting hole of the connecting rod is improved; the effective intercepting area of the boss, namely the projection area of the boss in the lubricating oil splashing speed direction, is as large as possible under the conditions of not influencing installation and structural strength and not interfering, and the design is favorable for the boss structure to intercept more splashing lubricating oil and provide more sufficient lubricating conditions. The boss structure comprises, but is not limited to, the semi-cylindrical hollow boss design and any structural design meeting the design requirements.
The connecting rod with the efficient oil collecting hole has the following characteristics: (1) The oil collecting hole is simple in structure and convenient to process, and only the boss structure is added on the basis of the existing oil collecting hole. (2) The reliability is high, and the boss does not contain any movable part, reduces the possibility that part fatigue became invalid by a wide margin. (3) The oil collecting efficiency is high, and compared with the oil collecting hole design of a common connecting rod, the oil collecting hole can capture and collect lubricating oil more effectively due to the boss design. (4) The structural strength of the existing connecting rod is not damaged, and the structural influence on the existing connecting rod is avoided.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A connecting rod with a high-efficiency oil collecting hole is provided, and the oil collecting hole is arranged at the small end of the connecting rod and is characterized in that a boss is arranged at the periphery of the oil collecting hole along the incoming flow direction of splashed lubricating oil; an oil guide structure is arranged between the lug boss and the oil collecting hole.
2. The connecting rod of claim 1, wherein a space is left between the boss and the piston dome.
3. The connecting rod of claim 1, wherein the boss is shaped as: square, rectangle, trapezoid, or other arbitrary shapes having an intercepting area in the incoming flow direction of the splashed lubricating oil; the boss is a single plate or has a certain thickness.
4. The connecting rod of claim 1, wherein the boss is: the oil collecting hole is formed by extending outwards along the oil hole.
5. The connecting rod of claim 1, wherein the splash oil dam section of the boss is concave.
6. The connecting rod as claimed in any one of claims 1 to 5, wherein the splash lubrication oil dam section of the boss is an inclined surface, and the inclined surface is the oil guide structure.
7. The connecting rod of claim 1, wherein the oil gathering hole is a single oil hole or a multiple oil hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211328458.0A CN115681302A (en) | 2022-10-27 | 2022-10-27 | Connecting rod with efficient oil collecting hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211328458.0A CN115681302A (en) | 2022-10-27 | 2022-10-27 | Connecting rod with efficient oil collecting hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115681302A true CN115681302A (en) | 2023-02-03 |
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ID=85099929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211328458.0A Pending CN115681302A (en) | 2022-10-27 | 2022-10-27 | Connecting rod with efficient oil collecting hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115681302A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1063862B (en) * | 1957-04-09 | 1959-08-20 | Heinkel Ag Ernst | Device for lubricating the upper connecting rod eye with centrifugal lubrication |
| CN201125934Y (en) * | 2007-11-14 | 2008-10-01 | 青年汽车集团有限公司 | Automobile engine linkage rod |
| KR20090020945A (en) * | 2007-08-24 | 2009-02-27 | 현대자동차주식회사 | Lubricating system for crank journal of a deisel vehicle |
| JP2015025424A (en) * | 2013-07-26 | 2015-02-05 | 三菱自動車工業株式会社 | Engine |
| CN106677854A (en) * | 2017-01-23 | 2017-05-17 | 广西玉柴机器股份有限公司 | Oil collecting structure of connecting rod small end |
-
2022
- 2022-10-27 CN CN202211328458.0A patent/CN115681302A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1063862B (en) * | 1957-04-09 | 1959-08-20 | Heinkel Ag Ernst | Device for lubricating the upper connecting rod eye with centrifugal lubrication |
| KR20090020945A (en) * | 2007-08-24 | 2009-02-27 | 현대자동차주식회사 | Lubricating system for crank journal of a deisel vehicle |
| CN201125934Y (en) * | 2007-11-14 | 2008-10-01 | 青年汽车集团有限公司 | Automobile engine linkage rod |
| JP2015025424A (en) * | 2013-07-26 | 2015-02-05 | 三菱自動車工業株式会社 | Engine |
| CN106677854A (en) * | 2017-01-23 | 2017-05-17 | 广西玉柴机器股份有限公司 | Oil collecting structure of connecting rod small end |
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