CN205477932U - Hydraulic drive formula variable compression ratio piston link assembly - Google Patents
Hydraulic drive formula variable compression ratio piston link assembly Download PDFInfo
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- CN205477932U CN205477932U CN201620202336.0U CN201620202336U CN205477932U CN 205477932 U CN205477932 U CN 205477932U CN 201620202336 U CN201620202336 U CN 201620202336U CN 205477932 U CN205477932 U CN 205477932U
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Abstract
The utility model discloses a hydraulic drive formula variable compression ratio piston link assembly, for overcoming the problem that the mechanism is complicated, wearing and tearing are big, control accuracy is low that prior art exists, hydraulic drive formula variable compression ratio piston link assembly includes hydraulic component such as piston, extension spring, piston pin, connecting rod, three -position four -way electromagnetic valve, hydraulic pump, check valve, machine oil is taken out to the hydraulic pump, through three -position four -way electromagnetic valve 's the switching -over after, in the oil circuit of successively flow through connecting rod and piston pin, thereby makes main oil pocket bulk reduction reduce engine compression ratio through making the push rod back down in the check valve mode of bobble at last, thereby make the increase of main oil pocket volume improve engine compression ratio through the mode that makes in the piston lower part of the body oil circuit oil pressure increase back down the check valve bobble, pressure scaling piston adopt hydraulic pressure mechanism mode, the response rapidly, high, the good reliability of accuracy, satisfy engine needs to dynamic property, fuel economy under each operating mode.
Description
Technical field
The present invention relates to a kind of vehicle engine thermomechanical components, be a kind of hydraulic drive type variable-compression-ratio piston link assembly in particular.
Background technology
Automobile compression ratio refers to the degree that engine mixed gas body is compressed, with the cylinder total volume before compression with compress after the ratio of volume of cylinder (i.e. combustion chamber volume) represent.Compression ratio and engine performance have much relations, common low pressure compression ratio to refer to compression ratio below 10, and high compression ratio is more than 10, and compression ratio is the highest comparatively speaking, and the power of electromotor is the biggest.In general, in the case of other designs of electromotor are constant, the car power that compression ratio is the highest is the biggest, and efficiency is the highest, and fuel economy aspect also can be better.But the too high meeting of compression ratio causes stability to decline, knock rating increases, and engine life shortens.
If low grade gasoline selected by the electromotor of high compression ratio, can make cylinder temperature play liter, gasoline combustion is incomplete, machine sharp pounding, so that output declines, parts are impaired.The electromotor of low compression ratio is obstinately with high grade oil, arise that " stagnant combustion " phenomenon, it is less than self-ignition point to be i.e. pressed onto head, equally there will be incomplete combustion phenomenon, electromotor is not had yet benefit, therefore research staff develops the electromotor with changeable compression ratio technique, can be at the numerical value of different operating mode down conversion compression ratios, to meet electromotor under each operating mode to oil product, the thermal efficiency, the requirement of dynamic property.
The most ripe variable compression ratio engine is broadly divided into the toggle of employing non-traditional structure, changes bent axle and cylinder top spacing and change piston rod length three class, but the technology compression ratio to be controlled that these potentiality are infinite is accomplished by more complicated structure, even to carrying out substantial amounts of transformation in whole cylinder, this can increase electromotor volume the most on the contrary, and difficulty of processing becomes big simultaneously.In addition, the problem such as abrasion, control accuracy, sealing is all the most thorny.
Summary of the invention
For the problem in the prior art that presently, there are, the present invention proposes a kind of hydraulic drive type variable-compression-ratio piston link assembly, response is rapidly, good manufacturability, highly reliable, in particular, piston is divided into piston upper body and piston lower body two parts by the present invention, form main oil pocket between piston upper body and piston lower body, changed the size of main oil pocket inner volume by hydraulic mechanism, thus reach to change the purpose of engine compression ratio.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of hydraulic drive type variable-compression-ratio piston link assembly, including piston rod part (piston upper body, piston lower body, stretching spring, piston pin, connecting rod), piston rod part internal oil passages and motor element, the outside oil circuit of piston rod part and motor element, it is characterised in that:
Piston is divided into piston upper body and piston lower body, is opened by two different form of regulation check valve and makes machine oil flow in or out main oil pocket thus increase or reduction compression ratio；
The oilhole of this hydraulic mechanism piston lower body oil circuit, the upper oil hole of oilhole oil circuit left and right with piston pin of push rod chamber lower end dock, the upper oil hole of the lower oilhole oil circuit left and right with connecting rod of the left and right oil circuit of piston pin docks, and the lower oilhole of the left and right oil circuit of connecting rod is connected with the outlet of three position four-way electromagnetic valve.
Described three position four-way electromagnetic valve passes through energising and the power-off of electric magnet, changes the direction of motion of spool, thus changes machine oil and enter the direction of the left and right oil circuit of connecting rod.
The machine oil entered from the left oil circuit of connecting rod flows into piston lower body oil circuit, and piston lower body oil circuit pressure increases to be made to move on check valve bead, and machine oil enters main oil pocket, and main oil chamber volume increases so that electromotor has high compression ratio.
The machine oil entered from the right oil circuit of connecting rod flows into the right oil circuit of piston pin, and the increase of piston pin right oil circuit pressure makes push rod will push away on check valve bead, and machine oil flows out main oil pocket, and main oil chamber volume reduces so that electromotor has low compression ratio.
Output the left oil circuit of piston pin and two oil circuits of the right oil circuit of piston pin inside described piston pin, at four oilholes that two oil circuits intersect with piston pin surface, respectively open an external groove.
At the oil-in of described hydraulic mechanism, oil filter is installed, filters out the impurity in oil-feed oil circuit.
Being provided with overflow valve in described hydraulic mechanism oil-feed oil circuit, when oil-feed oil circuit pressure is excessive, overflow valve is opened, and hydraulic mechanism is carried out overload protection.
Described hydraulic mechanism oil-feed oil circuit is provided with choke valve, by regulating the aperture of throttle valve, regulates oil-feed flow velocity, thus control the speed that compression ratio changes.
Described piston upper body is connected by the special attachment means of stretching spring with piston lower body, overcomes the inertia force of piston upper body, prevents piston upper body from separating with piston lower body.
Described stretching spring be upper and lower two ends respectively with the part of four attachment means, attachment means be circular arc flat key one end by stub be fixed on stretching spring surface, there is hemispherical dome structure the other end of circular arc flat key.
Described piston lower body divides section part to have the connection slotted eye corresponding with stretching spring, piston lower body upper surface, piston upper body lower surface constitutes main oil pocket with piston lower body inwall, shoulder hole is had for installing check valve on the right side of piston lower body upper surface, its middle washer is arranged in the macropore of shoulder hole for fixing check valve, the direction shoulder hole corresponding with check valve is as push rod chamber, the perforate of push rod chamber bottom is on the right side of piston hole surface, two shoulder hole contact positions output piston lower body oil circuit, oil circuit exports on the left of piston hole surface, piston hole left and right end respectively has a circle inner groovy.
Described push rod chamber is shoulder hole shape, places push rod, push rod spring fix in push rod chamber, and push rod spring is in compressive state.
Outputing the left oil circuit of connecting rod and two oil circuits of the right oil circuit of connecting rod inside described connecting rod, wherein oil circuit entrance is in the bottom of the inner surface of wrist-pin end of connecting rod, and by connecting rod shank, oil circuit outlet is in the side on connecting rod tip top.
Compared with currently available technology, beneficial effects of the present invention is embodied in:
(1) present invention changes the size of main oil pocket internal volume by hydraulic-driven, thus changes the compression ratio of electromotor, reliable operation, and response is rapidly.
(2) hydraulic drive mechanism of the present invention has been provided with check valve and overflow valve, it is separately mounted to below main oil pocket and in in-line, prevent these two sections of deathtraps too high and hydraulic mechanism is destroyed due to hydraulic pressure, work relatively reliable.
(3) hydraulic mechanism that the present invention uses utilizes machine oil in engine sump tank by hydraulic oil as hydraulic mechanism after the filtration of oil filter, it is to avoid the possibility of outer filler tank so that mechanism more simplifies.
(4) main change involved in the present invention is all on piston, and piston pin and connecting rod mainly get out corresponding oil duct, and this makes engine reformation cost be substantially reduced, good economy performance.
(5) present invention is by changing the valve of choke valve, can regulate the flow velocity of hydraulic oil in in-line, thus accurately control the rate of change of compression ratio.
The compression ratio engine realized by hydraulic mechanism can promote the thermal efficiency of electromotor, improve Fuel Economy, be applicable to multipropellant and drive, contribute to reducing discharge, improve engine operational stability, ensureing on the premise of dynamic property, engine displacement can be made to reduce further, structure is the compactest, and specific mass is higher.
Accompanying drawing explanation
Fig. 1 is the front view of variable compression ratio hydraulic mechanism and oil circuit distribution.
Fig. 2 is the structure diagonal view of stretching spring part.
Fig. 3 be piston upper body part be front view.
Fig. 4 is the A-A projection view of piston upper body part front view.
Fig. 5 is the C-C projection view of piston upper body part front view.
Fig. 6 is the front view of piston pin part.
Fig. 7 is the B-B projection view of piston pin part front view.
Fig. 8 is the front view of connecting rod part.
Fig. 9 is the D-D projection view of connecting rod part front view.
Description of reference numerals:
1-piston upper body, 2-stretches spring, the main oil pocket of 3-, 4-packing ring, check valve (5-spring, 6-bead), 7-push rod, 8-push rod chamber, 9-push rod spring, 10-snap ring, 11-piston lower body oil circuit, the left oil circuit of 12-piston pin, the right oil circuit of 13-piston pin, 14-piston pin, 15-connecting rod, the left oil circuit of 16-connecting rod, the right oil circuit of 17-connecting rod, 18-three position four-way electromagnetic valve, 19-choke valve, 20-oil filter, 21-overflow valve, 22-piston lower body.
Detailed description of the invention
Illustrate the present invention is described in detail below according to accompanying drawing, of the present invention for a kind of preferred implementation in numerous embodiments.
Refering to Fig. 1, piston is divided into piston upper body 1 and piston lower body 22 two parts, linked together by stretching spring 2, check valve is arranged on the lower surface of main oil pocket 3, connection push rod chamber 8 below check valve bead 6, the side of check valve bead 6 connects piston lower body oil circuit 11, the upper oil hole of piston lower body oil circuit 11 oil circuit left with piston pin 12 is corresponding, oilhole oil circuit right with piston pin 13 upper oil hole of push rod chamber 8 lower end is corresponding, piston pin 14 constrains on piston lower body 22 by snap ring 10, it is therefore prevented that the play that piston pin 14 is axial；The upper oil hole of the lower oilhole oil circuit left with connecting rod 16 of the left oil circuit of piston pin 12 is corresponding, the upper oil hole of the lower oilhole oil circuit right with connecting rod 17 of the right oil circuit of piston pin 13 is corresponding, from the left and right oil circuit of connecting rod 16, the left and right interface of a certain position in 17 three position four-way electromagnetic valves 18 of docking respectively drawing lower oil circuit, the machine oil in oil sump is directly connect on the left of this corresponding left and right interface, right side, by returning to oil sump after drawing two side oil circuit one side joint overflow valves 21 after choke valve 19, oil filter 20, returns to oil sump after the hydraulic pump that another side joint is connected with motor.
Refering to Fig. 2, described stretching spring 2 be upper and lower two ends respectively with the part of four attachment means, attachment means is that one end of circular arc flat key is fixed on the upper and lower surface stretching spring 2 by stub, and there is hemispherical dome structure the other end of circular arc flat key.
Refering to Fig. 3, Fig. 4, Fig. 5, described piston upper body 1 inner surface has the circular arc flat key connected in star corresponding with stretching spring 2, and the circular arc flat key connected in star of twice angle is arranged at inner surface top, piston upper body 1, as the connection slotted eye connecting stretching spring.
Refering to Fig. 1, 1 point of section part of described piston lower body has the connection slotted eye corresponding with stretching spring 2, piston lower body 22 upper surface, piston upper body 1 lower surface constitutes main oil pocket 3 with piston lower body 22 inwall, shoulder hole is had for installing check valve on the right side of piston lower body 22 upper surface, its middle washer 4 is arranged in the macropore of shoulder hole for fixing check valve, the opposite direction shoulder hole corresponding with check valve is as push rod chamber 8, push rod chamber 8 bottom perforate is to the right side on piston hole surface, two shoulder hole contact positions output piston lower body oil circuit 11, oil circuit exports on the right side of piston hole surface, piston hole left and right end respectively has a circle inner groovy, fixing for snap ring 10.
After the attachment means of stretching spring 2 being alignd with the groove of piston upper body 1, extrude, rotating, stretching spring 2 is just fixed together with piston upper body 1, same, the attachment means of stretching spring 2 is linked together with piston lower body 22.
Refering to Fig. 6, Fig. 7, described piston pin 14 is internal outputs the left oil circuit of piston pin 12 and 13 two oil circuits of the right oil circuit of piston pin, article two, at four oilholes that oil circuit intersects with piston pin 14 surface, respectively open an external groove, make piston pin 14 in motor process, even if the oilhole of the left and right oil circuit of piston pin 12,13 and the left and right oil circuit of connecting rod 16,17, piston lower body oil circuit 11 oilhole the most just to also producing cutout phenomenon.
Refering to Fig. 8, Fig. 9, described connecting rod 15 is internal outputs the left oil circuit of connecting rod 16 and 17 two oil circuits of the right oil circuit of connecting rod, and oil circuit entrance holds greatly upper side at connecting rod 15, and by connecting rod 15 shaft, oil circuit outlet is in the bottom of the inner surface of connecting rod 15 small end.
Refering to Fig. 1, when engine compression ratio is constant, the electric magnet of three position four-way electromagnetic valve 18 the right and left is in off-position, now three position four-way electromagnetic valve 18 is in middle position state, and motor-driven hydraulic pump is by the machine oil suction oil pipe in oil sump, and machine oil is after oil filter 20 filters, filter off the machine oil after impurity and be back to oil sump after choke valve 19 with three position four-way electromagnetic valve 18, the back pressure of the most whole oil circuit is little, and overflow valve 21 is in normally open, and the compression ratio of electromotor is constant.
nullRefering to Fig. 2，When engine compression ratio is reduced by needs，The electric magnet energising on three position four-way electromagnetic valve 18 left side，Spool is moved to the left，Now motor-driven hydraulic pump is by the machine oil suction oil pipe in oil sump，Machine oil is after oil filter 20 filters，Filter off the machine oil after impurity after choke valve 19 with three position four-way electromagnetic valve 18, enter the right oil circuit of connecting rod 17 and the right oil circuit of piston pin 13，The pressure of whole oil-feed oil circuit slowly increases，When reaching the maximum pressure upper limit that engine oil pressure reaches push rod chamber 8，Now，The push rod 7 of engine oil pressure jack-up push rod chamber 8，Push rod 7 overcomes the pressure of the pressure of push rod spring 9 and push rod chamber 8 inner engine oil by the bead 6 in check valve upwardly，Check valve is in opening，All the time bonding state it is in piston lower body 22 in the pulling force lower piston upper body 1 of stretching spring 2，，Piston upper body 1 moves down，Main oil pocket 3 volume diminishes，Machine oil in main oil pocket 3 flows in piston lower body 22 oil circuit，And through the left oil circuit of piston pin 12、Return in oil sump after the left oil circuit of connecting rod 16 and three position four-way electromagnetic valve 18，Now engine compression ratio reduces，The flow velocity of machine oil in oil-feed oil circuit is controlled by the valve opening of regulation choke valve 19，Thus reach to control the speed that engine compression ratio declines，When compression ratio is reduced to desired value，The electric magnet power-off on three position four-way electromagnetic valve 18 left side，Spool returns to middle position，Now the bead 6 in check valve moves down，Block at one-way valve inlet，Main oil pocket 3 inner engine oil no longer flows，Engine compression ratio no longer declines.
nullRefering to Fig. 1，When electromotor needs high compression ratio，Electric magnet energising on the right of three position four-way electromagnetic valve 18，Spool moves right，Now motor-driven hydraulic pump is by the machine oil suction oil pipe in oil sump，Machine oil is after oil filter 20 filters，Filter off the machine oil after impurity after choke valve 19 with three position four-way electromagnetic valve 18, enter the left oil circuit of connecting rod 16、The left oil circuit of piston pin 12、In piston lower body oil circuit 11 and push rod chamber 8，The pressure of whole oil-feed oil circuit slowly increases，When the pressure in oil-feed oil circuit reaches the maximum pressure limit value of check valve，Machine oil overcomes the bead 6 in the pressure jack-up check valve of spring 5，Enter in main oil pocket 3，Main oil pocket 3 volume increases，Piston upper body 1 overcomes the pulling force of stretching spring 2 to move up，Now the compression ratio of electromotor rises，The flow velocity of machine oil in oil-feed oil circuit is controlled by the valve opening of regulation choke valve 19，Thus reach to control the speed that engine compression ratio rises，When compression ratio rises to desired value，Electric magnet power-off on the right of three position four-way electromagnetic valve 18，Spool returns to middle position，Now the bead 6 in check valve moves down，Block at one-way valve inlet，Main oil pocket 3 inner engine oil no longer flows，Engine compression ratio no longer rises.When the pressure in main oil pocket 3 is excessive, during close to hydraulic system critical pressure point, the spool of overflow valve 21 moves to left, and machine oil is draining at overflow valve 21, and the pressure of whole oil circuit reduces, thus plays the effect of overload protection.
The above describes for the formula example making accompanying drawing; obviously implementing of the present invention is not limited by above-mentioned example; as long as using the various improvement that the method design of the present invention is carried out with technical scheme, or the most improved other occasions that directly applies to, the most within the scope of the present invention.
Claims (10)
1. a hydraulic drive type variable-compression-ratio piston link assembly, it is characterized in that described hydraulic drive type variable-compression-ratio piston link assembly includes piston upper body (1), piston lower body (22), stretching spring (2), piston pin (14), connecting rod (15), piston rod part internal oil passages and motor element, the outside oil circuit of piston rod part and motor element: piston is divided into piston upper body (1) and piston lower body (22), opened by two different form of regulation check valve and make machine oil flow in or out main oil pocket (3) thus increase or reduction compression ratio；
The oilhole of piston lower body oil circuit (11), oilhole and the left and right oil circuit of piston pin (12 of push rod chamber (8) lower end, 13) upper oil hole docking, the left and right oil circuit of piston pin (12,13) lower oilhole and the left and right oil circuit of connecting rod (16,17) upper oil hole docking, the lower oilhole of the left and right oil circuit of connecting rod (16,17) is connected with the outlet of three position four-way electromagnetic valve (18).
2. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that the energising by electric magnet of the described three position four-way electromagnetic valve (18) and power-off, change the direction of motion of spool, thus change machine oil and enter the direction of the left and right oil circuit of connecting rod (16,17).
3. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that the machine oil entered from the left oil circuit of connecting rod (16) flows into piston lower body oil circuit (11), piston lower body oil circuit (11) pressure increases makes the upper shifting of check valve bead (6), machine oil enters main oil pocket (3), main oil pocket (3) volume increases so that electromotor has high compression ratio.
4. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that the machine oil entered from the right oil circuit of connecting rod (17) flows into the right oil circuit of piston pin (13), the increase of piston pin right oil circuit (13) pressure makes push rod (7) above be pushed away by check valve bead (6), machine oil flows out main oil pocket (3), main oil pocket (3) volume reduces so that electromotor has low compression ratio.
5. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, described piston pin (14) is internal outputs the left oil circuit of piston pin (12) and (13) two oil circuits of the right oil circuit of piston pin, article two, at four oilholes that oil circuit intersects with piston pin (14) surface, respectively opened an external groove.
6. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that described piston upper body (1) is connected by stretching spring (2) with piston lower body (22), overcome the inertia force of piston upper body (1), prevent piston upper body (1) from separating with piston lower body (22).
7. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 6, it is characterized in that described stretching spring (2) is that upper and lower two ends are respectively with the part of four attachment means, attachment means is the surface that one end of circular arc flat key is fixed on stretching spring (2) by stub, and there is hemispherical dome structure the other end of circular arc flat key.
8. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 6, it is characterized in that described piston lower body (22) point section part has the connection slotted eye corresponding with stretching spring (2), piston lower body (22) upper surface, piston upper body (1) lower surface constitutes main oil pocket (3) with piston lower body (22) inwall, shoulder hole is had for installing check valve on the right side of piston lower body (22) upper surface, its middle washer (4) is arranged in the macropore of shoulder hole for fixing check valve, the direction shoulder hole corresponding with check valve is as push rod chamber (8), push rod chamber (8) bottom perforate is on the right side of piston hole surface, two shoulder hole contact positions output piston lower body oil circuit (11), oil circuit exports on the left of piston hole surface, piston hole left and right end respectively has a circle inner groovy.
9. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that described push rod chamber (8) is shoulder hole shape, push rod (7) is placed in push rod chamber (8), being fixed by push rod spring (9), push rod spring (9) is in compressive state.
10. according to the hydraulic drive type variable-compression-ratio piston link assembly described in claim 1, it is characterized in that described connecting rod (15) is internal and output the left oil circuit of connecting rod (16) and (17) two oil circuits of the right oil circuit of connecting rod, wherein oil circuit entrance is in the bottom of the inner surface of connecting rod (15) small end, by connecting rod (15) shaft, the side on top is held greatly in oil circuit outlet at connecting rod (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620202336.0U CN205477932U (en) | 2016-03-16 | 2016-03-16 | Hydraulic drive formula variable compression ratio piston link assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620202336.0U CN205477932U (en) | 2016-03-16 | 2016-03-16 | Hydraulic drive formula variable compression ratio piston link assembly |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626258A (en) * | 2016-03-16 | 2016-06-01 | 吉林大学 | Hydraulic-drive type variable-compression-ratio piston connection rod assembly |
| CN107762641A (en) * | 2017-09-07 | 2018-03-06 | 浙江锋锐发动机有限公司 | A kind of continuous variable compression ratio engine device and compression ratio transform method |
| CN108825372A (en) * | 2018-06-27 | 2018-11-16 | 大连理工大学 | A kind of low speed machine low energy consumption quick response variable combustion volume mechanism |
| CN110582625A (en) * | 2017-04-10 | 2019-12-17 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod for piston engine |
| CN111425313A (en) * | 2020-03-20 | 2020-07-17 | 唐为民 | Combined piston with variable compression ratio |
-
2016
- 2016-03-16 CN CN201620202336.0U patent/CN205477932U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626258A (en) * | 2016-03-16 | 2016-06-01 | 吉林大学 | Hydraulic-drive type variable-compression-ratio piston connection rod assembly |
| CN105626258B (en) * | 2016-03-16 | 2018-02-13 | 吉林大学 | Hydraulic drive type variable-compression-ratio piston link assembly |
| CN110582625A (en) * | 2017-04-10 | 2019-12-17 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod for piston engine |
| CN110582625B (en) * | 2017-04-10 | 2021-10-29 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod for piston engine |
| CN107762641A (en) * | 2017-09-07 | 2018-03-06 | 浙江锋锐发动机有限公司 | A kind of continuous variable compression ratio engine device and compression ratio transform method |
| CN108825372A (en) * | 2018-06-27 | 2018-11-16 | 大连理工大学 | A kind of low speed machine low energy consumption quick response variable combustion volume mechanism |
| CN111425313A (en) * | 2020-03-20 | 2020-07-17 | 唐为民 | Combined piston with variable compression ratio |
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