CN203670436U - Variable length connecting rod for engine - Google Patents
Variable length connecting rod for engine Download PDFInfo
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- CN203670436U CN203670436U CN201320767010.9U CN201320767010U CN203670436U CN 203670436 U CN203670436 U CN 203670436U CN 201320767010 U CN201320767010 U CN 201320767010U CN 203670436 U CN203670436 U CN 203670436U
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- connecting rod
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- engine
- variable chamber
- length
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Abstract
The utility model relates to a connecting rod structure connected between an engine crankshaft and a piston, in particular to a variable length connecting rod for an engine. The variable length connecting rod comprises a connecting rod big end and a connecting rod small end which are connected through the connecting rod. The variable length connecting rod is characterized by comprising a first connecting rod and a second connecting rod which are in plug-in connection with each other in the length direction and respectively connected with the connecting rod big end and the connecting rod small end; the connecting rod further comprises a driving device which applies a continuous variable driving force on the first connecting rod or the second connecting rod in order to make the first connecting rod or the second connecting rod slide relative to each other or from opposite directions along the length direction. Through the adoption of the structure, the compression ratio can be changed by adjusting the connecting rod length to adapt to the compression ratio requirements under different working conditions of the engine, so that the exhaust emission is reduced while the fuel consumption is reduced.
Description
Technical field
The utility model relates to a kind of bar linkage structure being connected between engine crankshaft and piston, relates in particular to a kind of engine variable length connecting rod.
Background technique
In the structure of conventional gasoline machine, comprise the piston being slidably arranged in cylinder, bent axle is connected with connecting rod between piston and bent axle more, by the rotation of bent axle, and then drives the back and forth movement of piston in cylinder.Due to the employing of said structure, make petrol engine there is fixing compression ratio, in order to prevent that pinking occurs when the large load of low speed, regular price gasoline machine compression ratio is all relatively low, in the time of petrol engine cold start-up, normally ensure that by fuel oil enriching motor starts smoothly, can cause like this oil consumption higher, effulent increases; In addition, in the time of cold start-up, because compression ratio can cause delivery temperature low, thereby lengthen the light-off time of catalyst converter, thereby cause the pollutant being discharged in atmosphere more, and for direct spray petrol engine in cylinder, when cold start-up, also easily cause oil dilution, and can not realize motor freely changing under Sydney Atkinson circulation and Otto cycle.
Model utility content
For solving the deficiencies in the prior art, the utility model provides a kind of and has changed compression ratio to improve the engine variable length connecting rod of gasoline engine performance by adjusting length of connecting rod.
For achieving the above object, engine variable length connecting rod of the present utility model, comprise the connecting rod tip and the wrist-pin end of connecting rod that connect by connecting rod, described connecting rod comprises mutual first connecting rod and second connecting rod that peg graft, that be connected with wrist-pin end of connecting rod with connecting rod tip respectively along its length; Also comprise first connecting rod or second connecting rod are applied to continuous variable driving force so that first connecting rod and the second connecting rod drive unit of relative or slide in opposition along its length.
By as above structure, drive the mutual motion of first connecting rod and second connecting rod by drive unit, to change the length of connecting rod, and then realize the compression ratio demand under Under Different Work Condition of Engine, effectively raise engine performance, in reducing oil consumption, reduced discharge, realized the random conversion of Sydney Atkinson and Otto cycle, it is simple in structure simultaneously.
As the restriction to aforesaid way, in first connecting rod, be provided with cavity, the free end of described second connecting rod inserts in cavity; Be provided with the dividing plate that is slidably matched with cavity inner wall and cavity is separated into the first variable chamber and the second variable chamber at the free end of second connecting rod, in the first variable chamber and the second variable chamber, be respectively equipped with the first drive portion and the second drive portion that dividing plate are applied to variable activation force.
As the further restriction to aforesaid way, the first described drive portion and the second drive portion are all for being pumped to the fluid in the first variable chamber and the second variable chamber by oil pump by oil feed line; Also comprise the return tube being communicated with respectively with the first variable chamber and the second variable chamber.Adopt hydraulic driving first connecting rod and second connecting rod, the transmittance process of exerting all one's strength is more stable, has effectively increased compression ratio adjustment scope.
As the restriction to aforesaid way, described return tube extends to oil sump.Return tube is extended to oil sump, the utility model structure and existing engine structure can be combined, make overall structure simpler, compact, be convenient to the layout of overall structure on vehicle.
As the restriction to aforesaid way, described oil feed line and return tube are provided with the electro hydraulic valve that oil feed line and return tube are carried out to conducting control.
As the restriction to aforesaid way, the connecting port of oil feed line and the first variable chamber and the second variable chamber is all arranged in connecting rod tip.By this setting, in being convenient to oil feed line and arranging, prevent connecting port on multiple parts and the sealability causing declines, improve overall performance.
In sum, adopt the technical solution of the utility model, can change compression ratio by adjusting length of connecting rod, to adapt to the compression ratio demand under Under Different Work Condition of Engine, when having reduced fuel consume, reduced toxic emission.
Brief description of the drawings
Below in conjunction with the drawings and the specific embodiments, the utility model is done further to describe in detail:
Fig. 1 is the agent structure schematic diagram in the utility model embodiment;
Fig. 2 is the linkage structure sketch of Fig. 1 under hydraulic control;
In figure:
1, connecting rod; 101, first connecting rod; 102, second connecting rod; 103, dividing plate; 104, the first variable chamber; 105, the second variable chamber; 106, the first oil-feed port; 107, the second oil-feed port; 2, connecting rod tip; 3, wrist-pin end of connecting rod; 4, common machine oil pump; 5, high pressure lubricating oil pump; 6, the first one-way valve; 7, the second one-way valve; 8, oil feed line; 9, return tube; 10, oil sump; 11, electro hydraulic valve.
Embodiment
The present embodiment relates to a kind of engine variable length connecting rod, as shown in Figure 1, it comprises the connecting rod tip 2 and the wrist-pin end of connecting rod 3 that connect by connecting rod 1, connecting rod tip is used for being connected with the axle journal of not shown crankshaft-link rod, wrist-pin end of connecting rod 3 is for being connected with not shown piston, rotating drive connecting rod 1 by bent axle drives piston movement, and wherein, the linkage structure of connecting rod tip 2, wrist-pin end of connecting rod 3 and the two and crankshaft-link rod, piston all adopts structure of the prior art.
In the present embodiment, the second connecting rod 102 that connecting rod 1 comprises the first connecting rod 101 that is connected with connecting rod tip 2, is connected with wrist-pin end of connecting rod 3, and the end face diameter of first connecting rod 101 is greater than the end face diameter of second connecting rod 102, so that second connecting rod 102 can be inserted in first connecting rod 101 along its length.In structure of the present utility model, also comprise first connecting rod 101 or second connecting rod 102 are applied to continuous variable driving force so that first connecting rod 101 and second connecting rod 102 drive unit of relative or slide in opposition along its length, in the driving of drive unit and make first connecting rod 101 and second connecting rod 102 along its length when relative sliding, can shorten the length of connecting rod 1; In the driving of drive unit and make first connecting rod 101 and second connecting rod 102 along its length when slide in opposition, can increase the length of connecting rod 1.
In the present embodiment, the structure of drive unit adopts hydraulic structure, in order to adapt to this hydraulic structure, in first connecting rod 101, is provided with cavity, and the internal diameter of this cavity is greater than the end face diameter of second connecting rod 102; Insert and on the free end in cavity, be fixedly connected with dividing plate 103 at second connecting rod 102, dividing plate 103 is corresponding with the internal diameter of cavity, so that dividing plate 103 can slide in cavity, simultaneously, due to the setting of dividing plate 103, cavity is separated into the first variable chamber 104 that is positioned at diagram left side and the second variable chamber 105 that is positioned at diagram right side by dividing plate 103.
At interior first drive portion that arranges of the first variable chamber 104, interior second drive portion that arranges of the second variable chamber 105, the first drive portion and the second drive portion all can apply to dividing plate 103 driving force of continuous variable, the hydraulic structure of this enforcement, the first drive portion and the second drive portion all adopt hydraulic oil, between oil pump and the first variable chamber 104 and the second variable chamber 105, be connected with respectively oil feed line 8 as described below, in connecting rod tip 2, be provided with the first oil-feed port 106 that is communicated in oil feed line 8 and the first variable chamber 104, simultaneously, in connecting rod tip 2, be provided with the second oil-feed port 107 that is communicated in oil feed line 8 and the second variable chamber 105, the second oil-feed port 107 and the second variable chamber 105 form roundabout shape pipeline structure.In addition,, on bar linkage structure of the present utility model, be also provided with the return tube 9 being communicated with respectively with the first variable chamber 104 and the second variable chamber 105.Shown in Fig. 2, return tube 9 extends in oil sump 10, so that the fluid in the first variable chamber 104 and the second variable chamber 105 is fed back to oil sump 10.
Oil pump adopts common machine oil pump 4 parallel with one another and high pressure lubricating oil pump 5, is respectively equipped with the first one-way valve 6 and the second one-way valve 7 on the two pipeline in parallel.In order to realize the control to fluid operation, on oil feed line 8 and return tube 9, be provided with the electro hydraulic valve 11 that oil feed line 8 and return tube 9 are carried out to conducting control.
In use; in order to facilitate motor to start smoothly; before engine shutdown; electro hydraulic valve 11 power-off; now; electro hydraulic valve is in access state; common machine oil pump 4 is pumped to the first variable chamber 104 by the first one-way valve 6, electro hydraulic valve 11 and oil feed line 8 by fluid; the formation of its oil feed line 8 can be in conjunction with existing engine oil channel structure; as the machine oil after electro hydraulic valve 11 first arrives cylinder-body oil duct; arrive crankshaft oil gallery by cylinder-body oil duct again, finally arrived in the first variable chamber 104 by crankshaft oil gallery.Now; pressure in the first variable chamber 104 increases, and promotes second connecting rod 102 and moves right with state shown in Fig. 1, and the fluid in the second variable chamber 105 flows back to oil sump 10 by return tube 9; now; the length of connecting rod 1 increases, like this, and when restarting after shutting down; connecting rod 1 is in long status; engine compression ratio maximum, is beneficial to motor and starts fast, has realized fuel-economizing and has fallen row.
When motor is in the time that conventional load condition turns round, high pressure lubricating oil pump 5 is worked, and common machine oil pump 4 carries machine oil with lubricated to movement parts by other oil ducts.Motor is determined engine compresses top dead center position according to crankshaft position sensor and CMPS Camshaft Position Sensor, at motor during in compression stroke, the second variable chamber 105 is interior oil-filled, the first variable chamber 104 drainings, when the connecting rod integral length forming when first connecting rod 101 and second connecting rod 102 reaches and is applicable to length, control electro hydraulic valve, make length of connecting rod immutable.In the time of expansion stroke, electro hydraulic valve power-off, length of connecting rod is elongated, in the time arriving appropriate length, controls electro hydraulic valve, makes length of connecting rod constant, now, has realized the effect that reduces compression ratio, improves expansion ratio, has realized the higher thermal efficiency.
At motor, during in other part load conditions, high pressure lubricating oil pump 5 quits work, and to the first variable chamber fuel feeding, to regulate as the case may be compression ratio, makes motor in optimum compression ratio position by common machine oil pump 4, improves the thermal efficiency; And when motor is during in high load operating mode, be the power character that ensures motor, in reducing compression ratio, can regulate compression ratio by gathering throttle position signal and chamber pressure signal synthesis, effectively avoid pinking.
In addition, what deserves to be explained is, the hydraulic oil as the first drive portion and the second drive portion in the present embodiment can be substituted by other devices, as the two any one is changed into the structures such as spring, belongs to equally protection domain of the present utility model.
Claims (6)
1. an engine variable length connecting rod, comprise the connecting rod tip and the wrist-pin end of connecting rod that connect by connecting rod, it is characterized in that: described connecting rod comprises mutual first connecting rod and second connecting rod that peg graft, that be connected with wrist-pin end of connecting rod with connecting rod tip respectively along its length; Also comprise first connecting rod or second connecting rod are applied to continuous variable driving force so that first connecting rod and the second connecting rod drive unit of relative or slide in opposition along its length.
2. engine variable length connecting rod according to claim 1, is characterized in that: in first connecting rod, be provided with cavity, the free end of described second connecting rod inserts in cavity; Be provided with the dividing plate that is slidably matched with cavity inner wall and cavity is separated into the first variable chamber and the second variable chamber at the free end of second connecting rod, in the first variable chamber and the second variable chamber, be respectively equipped with the first drive portion and the second drive portion that dividing plate are applied to variable activation force.
3. engine variable length connecting rod according to claim 2, is characterized in that: the first described drive portion and the second drive portion are all for being pumped to the fluid in the first variable chamber and the second variable chamber by oil pump by oil feed line; Also comprise the return tube being communicated with respectively with the first variable chamber and the second variable chamber.
4. engine variable length connecting rod according to claim 3, is characterized in that: described return tube extends to oil sump.
5. engine variable length connecting rod according to claim 3, is characterized in that: described oil feed line and return tube are provided with the electro hydraulic valve that oil feed line and return tube are carried out to conducting control.
6. engine variable length connecting rod according to claim 3, is characterized in that: the connecting port of oil feed line and the first variable chamber and the second variable chamber is all arranged in connecting rod tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320767010.9U CN203670436U (en) | 2013-11-29 | 2013-11-29 | Variable length connecting rod for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320767010.9U CN203670436U (en) | 2013-11-29 | 2013-11-29 | Variable length connecting rod for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670436U true CN203670436U (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320767010.9U Expired - Fee Related CN203670436U (en) | 2013-11-29 | 2013-11-29 | Variable length connecting rod for engine |
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| Country | Link |
|---|---|
| CN (1) | CN203670436U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061228A (en) * | 2014-06-12 | 2014-09-24 | 王立华 | Engine connecting rod mechanism with variable compression ratio |
| CN104963935A (en) * | 2015-05-05 | 2015-10-07 | 苏犁 | Cylinder type internal combustion engine retractable connecting rod |
| CN107588088A (en) * | 2017-11-02 | 2018-01-16 | 吉林大学 | A kind of variable bent axle of crank length |
| CN108317158A (en) * | 2018-04-04 | 2018-07-24 | 吉林大学 | A kind of motor-driven variable length link of guide |
| CN109779751A (en) * | 2019-03-29 | 2019-05-21 | 潍柴动力股份有限公司 | Variable length link mechanism and engine |
| CN109804150A (en) * | 2016-07-06 | 2019-05-24 | Avl 里斯脱有限公司 | With the connecting rod using the adjustable length of connecting rod of mechanical operation |
| CN111828170A (en) * | 2019-04-16 | 2020-10-27 | 广州汽车集团股份有限公司 | Connecting rod for variable compression ratio engine |
| CN113494513A (en) * | 2020-04-07 | 2021-10-12 | 广州汽车集团股份有限公司 | Length-variable connecting rod device |
| CN114060148A (en) * | 2020-08-04 | 2022-02-18 | 长城汽车股份有限公司 | Variable length connecting rod, engine and connecting rod length control method |
-
2013
- 2013-11-29 CN CN201320767010.9U patent/CN203670436U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061228A (en) * | 2014-06-12 | 2014-09-24 | 王立华 | Engine connecting rod mechanism with variable compression ratio |
| CN104963935A (en) * | 2015-05-05 | 2015-10-07 | 苏犁 | Cylinder type internal combustion engine retractable connecting rod |
| WO2016177017A1 (en) * | 2015-05-05 | 2016-11-10 | 苏犁 | Telescopic connecting rod of cylinder-type internal combustion engine |
| CN109804150A (en) * | 2016-07-06 | 2019-05-24 | Avl 里斯脱有限公司 | With the connecting rod using the adjustable length of connecting rod of mechanical operation |
| CN107588088A (en) * | 2017-11-02 | 2018-01-16 | 吉林大学 | A kind of variable bent axle of crank length |
| CN108317158A (en) * | 2018-04-04 | 2018-07-24 | 吉林大学 | A kind of motor-driven variable length link of guide |
| CN108317158B (en) * | 2018-04-04 | 2023-10-10 | 吉林大学 | Motor-driven variable-length connecting rod with guide rod |
| CN109779751A (en) * | 2019-03-29 | 2019-05-21 | 潍柴动力股份有限公司 | Variable length link mechanism and engine |
| CN109779751B (en) * | 2019-03-29 | 2020-06-26 | 潍柴动力股份有限公司 | Variable length link mechanism and engine |
| CN111828170A (en) * | 2019-04-16 | 2020-10-27 | 广州汽车集团股份有限公司 | Connecting rod for variable compression ratio engine |
| CN111828170B (en) * | 2019-04-16 | 2021-11-23 | 广州汽车集团股份有限公司 | Connecting rod for variable compression ratio engine |
| CN113494513A (en) * | 2020-04-07 | 2021-10-12 | 广州汽车集团股份有限公司 | Length-variable connecting rod device |
| CN113494513B (en) * | 2020-04-07 | 2022-08-19 | 广州汽车集团股份有限公司 | Length-variable connecting rod device |
| CN114060148A (en) * | 2020-08-04 | 2022-02-18 | 长城汽车股份有限公司 | Variable length connecting rod, engine and connecting rod length control method |
| CN114060148B (en) * | 2020-08-04 | 2023-01-31 | 长城汽车股份有限公司 | Variable length connecting rod, engine and connecting rod length control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20211129 |