CN202348465U - Optimized variable compression ratio piston for internal combustion engine - Google Patents
Optimized variable compression ratio piston for internal combustion engine Download PDFInfo
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- CN202348465U CN202348465U CN2011204461634U CN201120446163U CN202348465U CN 202348465 U CN202348465 U CN 202348465U CN 2011204461634 U CN2011204461634 U CN 2011204461634U CN 201120446163 U CN201120446163 U CN 201120446163U CN 202348465 U CN202348465 U CN 202348465U
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Abstract
The utility model discloses an optimized variable compression ratio piston for an internal combustion engine, which is improved based on a variable compression ratio piston for an internal combustion engine with a publication number of CN101900056A. A compression ratio adjusting mechanism mainly comprises a central limiting disc and a peripheral supporting disc which are matched through a conical surface, a steel ball arranged in a V-shaped annular groove consisting of the central limiting disc and the peripheral supporting disc, and an elastic resetting part arranged between the steel ball and an inner cavity on the top of the piston. A spring seat disc is canceled, the original adjusting device shell is replaced by the peripheral supporting disc and the central limiting disc, the pretightening force is adjusted without changing pretightening contact point positions and contact angles between the steel ball and the elastic resetting part and between the peripheral supporting disc and the central limiting disc, the total pretightening height of the piston is not changed, and the piston has the characteristics that: the structure is simplified, the quality is reduced, the dynamic response is rapid, the pretightening position is easily determined and the like; and therefore, the compression ratio can be rapidly adaptively changed along with working conditions of a high-rotating speed engine.
Description
Technical field
It is that CN101900056A, denomination of invention are the further research improvement of variable-compression ratio piston of combustion engine that the utility model relates to publication number, refers to a kind of internal-combustion engine optimization type variable-compression-ratio piston particularly.
Background technique
Compression ratio has considerable influence to the performance of explosive motor.Changeable compression ratio technique is meant the technology that can control the compression ratio of motor according to the operating mode of motor.
The applicant has introduced a kind of variable-compression ratio piston of combustion engine in publication number is the Chinese invention patent ublic specification of application of CN101900056A; The compression ratio adjustment mechanism that is installed between piston head and the piston skirt changes the displacement of control piston top with respect to piston skirt according to in-cylinder pressure, and its displacement includes radially inclined-plane or the curved surface mechanical displacement that rolls and produce of belleville spring resiliently deformable that produces and the steel ball that circumferentially distributes.Its technological points be to adopt steel ball radially inclined-plane or the curved surface mechanical displacement that produces that rolls improved the load/deformation characteristic of elastic element, change thereby make its compression ratio make fast adaptability with engine operating condition.
Yet still there is big, the slow slightly problem of dynamic response of complicacy, weight of structure in the compression ratio adjustment mechanism of above-mentioned patent application.The claimant attempts through the cancellation spring cap in research process, lets steel ball and means such as elastic element directly contacts; Make compression ratio adjustment mechanism when the pretension state, have bigger rigidity; And have less rigidity in piston head during with respect to piston skirt generation relative displacement, but how to make its dynamic response quick more with accurately be puzzlement claimant's a difficult problem always.
Summary of the invention
The purpose of the utility model be exactly to provide that a kind of structure is simplified more, dynamic response is quick more, thereby the pretension position confirms to make its compression ratio to make the internal-combustion engine optimization type variable-compression-ratio piston that fast adaptability changes with the rev-happy engine operating mode more easily.
For realizing above-mentioned purpose; The internal-combustion engine optimization type variable-compression-ratio piston that the utility model designed; Comprise piston head and piston skirt, be provided with compression ratio adjustment mechanism between said piston head and the piston skirt, said compression ratio adjustment mechanism has central position-arresting disk and peripheral supporting disk through cone match; Said central position-arresting disk and piston head are rigidly connected; Said peripheral supporting disk and piston skirt are rigidly connected, and the annular stop face of said central position-arresting disk and the annular support surface of peripheral supporting disk enclose in the V-type annular groove of formation and be evenly distributed with steel ball, are provided with elastic reseting part between the annular cavity top of said steel ball and piston head; Said elastic reseting part, central position-arresting disk and peripheral supporting disk limit the radial rolling or the slip of steel ball jointly, and the pretightening force of said elastic reseting part keeps the conical surface between central position-arresting disk and the peripheral supporting disk to fit tightly and keeps forming flexible gap delta between bottom and the peripheral supporting disk of piston head.Like this, compression ratio adjustment mechanism can change the displacement of control piston top with respect to piston skirt according to in-cylinder pressure, regulates in-cylinder pressure through the variation of combustion chamber volume.
Further, on the said piston skirt, be provided with the answer cam with the top of the hinged wrist-pin end of connecting rod of wrist pin, said answer cam pushes away central position-arresting disk on being used for when the engine exhaust stroke, and auxiliary compression ratio adjustment mechanism in time resets.
Further, be provided with the adjustment pad between the annular cavity top of said piston head and the elastic reseting part.Through the increase and decrease of adjustment pad, can realize the adjusting of compression ratio and initial pretightening force easily.
Further, said annular stop face is varied angle inclined-plane or curved surface with the surface that annular support surface contacts with steel ball.The component that this varied angle inclined-plane or curved surface can make steel ball act on the peripheral supporting disk reduces, and the component that acts on the central position-arresting disk increases, thereby increases its downward mechanical displacement.
Again further; Said elastic reseting part is formed by stacking last belleville spring assembly and following belleville spring assembly relatively; The said belleville spring assembly of going up respectively comprises one or more pieces belleville springs with following belleville spring assembly; Wherein descend between each sheet belleville spring of belleville spring assembly and be provided with radial clearance, and this radial clearance is bigger near the center of belleville spring.Like this, the following butterfly spring assembly that contacts with steel ball has good deformation space, in the adjustment process of Piston Compression ratio, can reduce rigidity rapidly, increases displacement.
Again further, said belleville spring assembly down and steel ball bottom face in contact are provided with the conduit that is fit to steel ball radial rolling or slip.Like this, belleville spring assembly and the contacted specific pressure of steel ball can be effectively reduced, the surface friction drag between belleville spring assembly and the steel ball can also be reduced.
Further; Said piston head can also be combined by the piston head main body and the piston head core of detachable; Said central position-arresting disk is rigidly connected through centre bolt and piston head core, and also is connected through worm structure locking between the bottom outer wall of the top counterbore of said central position-arresting disk and piston head core.Piston head is designed to split type structure, can significantly improves the stress at piston head subdivision place on the one hand and concentrate, can use pot type piston processing variable-compression-ratio piston on the other hand, and need not cast the piston of new structure again, save research and development and processing cost.
The working principle of the internal-combustion engine optimization type variable-compression-ratio piston of the utility model is divided into three state descriptions:
One, pretension state.Motor is not worked or the pressure in the cylinder is less than predefined pressure during engine operation, and variable-compression-ratio piston is in the pretension state, and motor has higher compression ratio, and the thickness that changes the adjustment pad can conveniently be regulated pretightening force.The pretightening force of compression ratio adjustment mechanism keeps the conical surface between peripheral supporting disk and the central position-arresting disk to fit tightly, and has confirmed pretension contacting points position and pretension wrapping angle between steel ball and elastic reseting part, peripheral supporting disk and the central position-arresting disk.Keep the gap not contact between answer cam on the wrist-pin end of connecting rod and the central position-arresting disk.
Two, compressive state.Pressure during engine operation in the cylinder is greater than predefined pressure; The compression ratio adjustment mechanism that is installed between piston head and the piston skirt produces to bottom offset with respect to piston skirt according to in-cylinder pressure variation control piston top, changes the regulating and controlling in-cylinder pressure through volume of cylinder.Piston head with respect to what piston skirt produced to the bottom offset specific descriptions is: produce resiliently deformable under the effect of elastic reseting part at gas force; With the rigidly connected central position-arresting disk of piston head to bottom offset; The steel ball that causes circumferentially distributing entad rolls between elastic reseting part and peripheral supporting disk or slides; Contacting points position and wrapping angle between steel ball and elastic reseting part, peripheral supporting disk and the central position-arresting disk all change; And then the component that makes steel ball act on the peripheral supporting disk reduces, and the component that acts on the central position-arresting disk increases, and the downward mechanical displacement of steel ball increases.
Three, recoil state.When the exhaust stroke of motor, when the pressure in the cylinder sharply reduced, piston head produced to top offset with respect to piston skirt under the effect of elastic reseting part restoring force, and central position-arresting disk moves on also taking place axially thereupon.Because possibly there are the answer retardation phenomenon in the friction and the effect of system damping, the central position-arresting disk of pushing tow that makes progress of the answer cam on this moment wrist-pin end of connecting rod guarantees that compression ratio adjustment mechanism resets in each work cycle.
With publication number is that the application for a patent for invention of CN101900056A is compared; The distinguishing characteristics of the utility model is: the optimization type variable-compression-ratio piston that designs has been cancelled controlling device housing and spring cap simultaneously; The steel ball top directly contacts with the elastic reseting part bottom, and both sides, steel ball bottom directly contact with the V-type annular groove that the annular support surface of peripheral supporting disk encloses formation with the annular stop face of central position-arresting disk.Like this, its beneficial effect is embodied in following several respects:
One of which, the structure of compression ratio adjustment mechanism are simple more, quality greatly reduces, and cost is more cheap.
They are two years old; The steel ball of compression ratio adjustment mechanism during along the radial motion of V-type annular groove and the point of contact between the elastic reseting part constantly change; In, have bigger rigidity because the effect of pretightening force is prone to retaining mechanism during low-load, the compression ratio of promptly keeping depth pistion, internal-combustion engine is higher; And the radial motion through steel ball can produce certain deformation rapidly when high load, and the rigidity of mechanism is diminished, and promptly reduces depth pistion fast, and the compression ratio of internal-combustion engine is reduced thereupon.
They are three years old; The pretightening force of compression ratio adjustment mechanism is regulated convenient accurate; This pretightening force is regulated and is not changed pretension contacting points position and the wrapping angle between steel ball and elastic reseting part, peripheral supporting disk and the central position-arresting disk; Do not change the pretension total height of piston yet, thereby make its dynamic response accurately quick more.
In addition, the design of cam is replied on wrist-pin end of connecting rod top on piston skirt, pushes away central position-arresting disk on can be when the engine exhaust stroke, thereby guarantee that compression ratio adjustment mechanism in time resets in engine operational cycle.
Description of drawings
Fig. 1 is the main sectional structure schematic representation of embodiment's 1 said internal-combustion engine optimization type variable-compression-ratio piston.
Fig. 2 is the detailed indicating arrangement schematic representation of compression ratio adjustment mechanism among Fig. 1.
Fig. 3 be among Fig. 1 between steel ball and elastic reseting part, peripheral supporting disk and the central position-arresting disk contacting points position and wrapping angle change schematic representation.
Fig. 4 is the structure for amplifying schematic representation of the answer cam of wrist-pin end of connecting rod design among Fig. 1.
Fig. 5 is the structure for amplifying schematic representation of elastic reseting part among Fig. 1.
Fig. 6 is the structural representation of looking up of elastic reseting part among Fig. 5.
Fig. 7 is the main sectional structure schematic representation of embodiment's 2 said internal-combustion engine optimization type variable-compression-ratio pistons.
Fig. 8 is the detailed indicating arrangement schematic representation of compression ratio adjustment mechanism among Fig. 7.
Fig. 9 is the linkage structure schematic representation of piston head and central position-arresting disk among Fig. 7.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to describe in detail.
Embodiment 1:
As shown in Figure 1, the utility model embodiment 1 has introduced a kind of internal-combustion engine optimization type variable-compression-ratio piston, and it comprises piston head 1 and piston skirt 2, is provided with compression ratio adjustment mechanism 3 between piston head 1 and the piston skirt 2.When pretightening force that in-cylinder pressure is set less than compression ratio adjustment mechanism 3, piston head 1 does not have axial displacement with respect to piston skirt 2, and variable-compression-ratio piston and the conventional piston of this moment are basic identical.When pretightening force that in-cylinder pressure is set greater than compression ratio adjustment mechanism 3, compression ratio adjustment mechanism 3 changes control piston top 1 according to the in-cylinder pressure that acts on piston head 1 surface and does axial displacement with respect to piston skirt 2.
Shown in Fig. 2～6; Compression ratio adjustment mechanism 3 among the embodiment 1 has the central position-arresting disk 3.4 and peripheral supporting disk 3.3 through cone match; Central authorities' position-arresting disk 3.4 is rigidly connected through centre bolt 3.6 and piston head 1, and peripheral supporting disk 3.3 is rigidly connected through the piston pin boss 2.1 on lock bolt 2.2 and the piston skirt 2.Have simple in structure, connect characteristics stable, reliable operation.
, the annular support surface 3.3.1 of the annular stop face 3.4.1 of central position-arresting disk 3.4 and peripheral supporting disk 3.3 is evenly distributed with steel ball 3.2 in enclosing the V-type annular groove of formation; Annular stop face 3.4.1 is preferably designed as varied angle inclined-plane or curved surface with the surface that annular support surface 3.3.1 contacts with steel ball 3.2, has quick downward mechanical displacement to guarantee steel ball 3.2 when the high load.Between the annular cavity top of steel ball 3.2 and piston head 1 elastic reseting part 3.1 is installed, by circumferentially radial rolling or the slip of steel ball 3.2 between elastic reseting part 3.1, peripheral supporting disk 3.3 and central position-arresting disk 3.4 of distribution of axial displacement control of central position-arresting disk 3.4.The pretightening force of elastic reseting part 3.1 can keep the conical surface between central position-arresting disk 3.4 and the peripheral supporting disk 3.3 to fit tightly on the one hand; Can confirm pretension contacting points position and pretension wrapping angle between steel ball 3.2 and elastic reseting part 3.1, peripheral supporting disk 3.3 and the central position-arresting disk 3.4 on the other hand, form the flexible gap delta that designs between the bottom that can also keep simultaneously piston head 1 and the peripheral supporting disk 3.3.
Between the annular cavity top of above-mentioned piston head 1 and elastic reseting part 3.1, also be furnished with adjustment pad 3.5.The thickness that changes adjustment pad 3.5 can be regulated the pretightening force of compression ratio adjustment mechanism 3; This pretightening force regulative mode does not change pretension contacting points position and the pretension wrapping angle between steel ball 3.2 and elastic reseting part 3.1, peripheral supporting disk 3.3 and the central position-arresting disk 3.4, does not change the pretension total height of piston head 1 yet.
Above-mentioned elastic reseting part 3.1 is formed by stacking last belleville spring assembly 3.1.1 and following belleville spring assembly 3.1.2 relatively.Last belleville spring assembly 3.1.1 and following belleville spring assembly 3.1.2 respectively comprise two belleville springs.Wherein, be provided with radial clearance 3.1.2.1 between two belleville springs of following belleville spring assembly 3.1.2, and this radial clearance 3.1.2.1 is bigger near the center of belleville spring.During concrete the design, become variable section structure to get final product to its radial center skiving two belleville springs that descend belleville spring assembly 3.1.2.Like this, following butterfly spring assembly 3.1.2 is easy to deformation, when high load, can reduce rigidity rapidly, increases displacement, reaches the effect of quick adjustment Piston Compression ratio.In addition, following belleville spring assembly 3.1.2 and steel ball bottom face in contact are provided with the conduit 3.1.2.2 that is fit to steel ball 3.2 radial rollings or slip.Under the leading role of conduit 3.1.2.2, the specific contact pressure of following belleville spring assembly 3.1.2 and steel ball 3.2 significantly reduces, and surface friction drag declines to a great extent, the effect of quick adjustment Piston Compression ratio when more helping reaching high load.
On above-mentioned piston skirt 2, the cam 4.1 of answer is arranged with the upper design of the hinged wrist-pin end of connecting rod 4 of wrist pin 5.During engine operation, wrist-pin end of connecting rod 4 is around the swing of the center of wrist pin 5.When the conical surface between central position-arresting disk 3.4 and the peripheral supporting disk 3.3 fits tightly, reply between cam 4.1 and central position-arresting disk 3.4 bottoms (or centre bolt 3.6) and exist the gap can not contact.When the engine exhaust stroke; In when, under the effect of central position-arresting disk 3.4 at in-cylinder pressure axial displacement taking place when; If replying, compression ratio adjustment mechanism 3 lags behind; Reply cam 4.1 and contact with central position-arresting disk 3.4 bottoms (or centre bolt 3.6) this moment, replys cam 4.1 and guarantee that compression ratio adjustment mechanism 3 in time resets.
The working procedure of the foregoing description 1 is divided into three state narrations.
One, pretension state.The pressure in the cylinder is less than predefined pressure when motor is not worked or during engine operation, and variable-compression-ratio piston is in the pretension state, and motor has higher compression ratio, and the thickness that changes adjustment pad 3.5 can make things convenient for the pretightening force of controlling mechanism.The pretightening force of compression ratio adjustment mechanism 3 keeps the conical surface between peripheral supporting disk 3.3 and the central position-arresting disk 3.4 to fit tightly; And confirmed pretension contacting points position and the pretension wrapping angle between steel ball 3.2 and elastic reseting part 3.1, peripheral supporting disk 3.3 and the central position-arresting disk 3.4, the maintenance gap does not contact between the answer cam 4.1 on this moment wrist-pin end of connecting rod 4 and the central position-arresting disk 3.4.
Two, compressive state.Pressure during engine operation in the cylinder is greater than predefined pressure; The compression ratio adjustment mechanism 3 that is installed between piston head 1 and the piston skirt 2 produces to bottom offset with respect to piston skirt 2 according to in-cylinder pressure variation control piston top 1, changes the regulating and controlling in-cylinder pressure through volume of cylinder.Piston head 1 with respect to what piston skirt 2 produced to the bottom offset specific descriptions is: produce resiliently deformable under the effect of elastic reseting part 3.1 at gas force; With the rigidly connected central position-arresting disk of piston head 1 3.4 to bottom offset; The steel ball 3.2 that causes circumferentially distributing entad rolls between elastic reseting part 3.1 and peripheral supporting disk 3.3 or slides, and contacting points position and wrapping angle between steel ball 3.2 and elastic reseting part 3.1, peripheral supporting disk 3.3 and the central position-arresting disk 3.4 all change.Steel ball 3.2 makes elastic reseting part 3.1 distortion moments increase with the variation of elastic reseting part 3.1 contacting points positions, and rigidity reduces.The component that the variation of steel ball 3.2 and elastic reseting part 3.1 wrapping angles makes steel ball 3.2 act on the peripheral supporting disk 3.3 reduces, and the component that acts on the central position-arresting disk 3.4 increases, and steel ball 3.2 downward mechanical displacements increase.
Three, recoil state.When the exhaust stroke of motor, the pressure in the cylinder sharply reduces, and piston head 1 produces to top offset with respect to piston skirt 2 under the effect of elastic reseting part 3.1 restoring forces.Because friction and system damping exist and reply retardation phenomenon, the answer cam 4.1 on the wrist-pin end of connecting rod 4 can guarantee that compression ratio adjustment mechanism 3 resets in each work cycle at this moment.
Embodiment 2:
Shown in Fig. 7～9, the utility model embodiment 2 has introduced another kind of internal-combustion engine optimization type variable-compression-ratio piston, and it and embodiment's 1 structure is basic identical, comprises piston head 1 and piston skirt 2, is provided with compression ratio adjustment mechanism 3 between piston head 1 and the piston skirt 2.Compression ratio adjustment mechanism 3 mainly is made up of parts such as elastic reseting part 3.1, steel ball 3.2, peripheral supporting disk 3.3, central position-arresting disk 3.4, adjustment pads 3.5.Elastic reseting part 3.1 is formed by stacking last belleville spring assembly 3.1.1 and following belleville spring assembly 3.1.2 relatively.Its difference is: piston head 1 is combined with piston head core 1.2 by the piston head main body 1.1 of detachable; Central authorities' position-arresting disk 3.4 is rigidly connected through centre bolt 3.6 and piston head core 1.2, and also locks through worm structure 1.2.1 between the bottom outer wall of the top counterbore of central position-arresting disk 3.4 and piston head core 1.2 and be connected.
Piston head 1 is designed to split type structure, can becomes variable-compression-ratio piston with the pot type piston process and remould, and need not cast the piston of new structure again, can significantly save research and development and processing cost like this.And piston head 1 is split into piston head main body 1.1 and piston head core 1.2 in the maximum place of stress, can effectively improve the stress concentration phenomenon of piston head 1, increases the service life.In addition, central position-arresting disk 3.4 both was connected through centre bolt 3.6 with piston head core 1.2, and through worm structure 1.2.1 locking, effectively interlocking is locking, guarantees the stability of variable-compression-ratio piston work again.
Claims (9)
1. internal-combustion engine optimization type variable-compression-ratio piston; Comprise piston head (1) and piston skirt (2); Be provided with compression ratio adjustment mechanism (3) between said piston head (1) and the piston skirt (2); It is characterized in that: said compression ratio adjustment mechanism (3) has through the central position-arresting disk (3.4) of cone match and peripheral supporting disk (3.3); Said central position-arresting disk (3.4) is rigidly connected with piston head (1); Said peripheral supporting disk (3.3) and piston skirt (2) are rigidly connected, and the annular stop face (3.4.1) of said central position-arresting disk (3.4) and the annular support surface (3.3.1) of peripheral supporting disk (3.3) enclose in the V-type annular groove of formation and be evenly distributed with steel ball (3.2), are provided with elastic reseting part (3.1) between the annular cavity top of said steel ball (3.2) and piston head (1); Said elastic reseting part (3.1), central position-arresting disk (3.4) and peripheral supporting disk (3.3) limit the radial rolling or the slip of steel ball (3.2) jointly, and the pretightening force of said elastic reseting part (3.1) keeps the conical surface between central position-arresting disk (3.4) and the peripheral supporting disk (3.3) to fit tightly and keeps forming flexible gap delta between bottom and the peripheral supporting disk (3.3) of piston head (1).
2. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1; It is characterized in that: on the said piston skirt (2); Be provided with the top of the hinged wrist-pin end of connecting rod (4) of wrist pin (5) and reply cam (4.1); Said answer cam (4.1) pushes away central position-arresting disk (3.4) on being used for when the engine exhaust stroke, and auxiliary compression ratio adjustment mechanism (3) in time resets.
3. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2 is characterized in that: be provided with adjustment pad (3.5) between the annular cavity top of said piston head (1) and the elastic reseting part (3.1).
4. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2 is characterized in that: said annular stop face (3.4.1) is varied angle inclined-plane or curved surface with the surface that annular support surface (3.3.1) contacts with steel ball (3.2).
5. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2 is characterized in that: said central position-arresting disk (3.4) is rigidly connected through centre bolt (3.6) and piston head (1).
6. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2 is characterized in that: said peripheral supporting disk (3.3) is rigidly connected through the piston pin boss (2.1) on lock bolt (2.2) and the piston skirt (2).
7. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2; It is characterized in that: said elastic reseting part (3.1) is formed by stacking last belleville spring assembly (3.1.1) and following belleville spring assembly (3.1.2) relatively; Said upward belleville spring assembly (3.1.1) and following belleville spring assembly (3.1.2) respectively comprise one or more pieces belleville springs; Wherein descend between each sheet belleville spring of belleville spring assembly (3.1.2) and be provided with radial clearance (3.1.2.1), and this radial clearance (3.1.2.1) is bigger near the center of belleville spring.
8. internal-combustion engine optimization type variable-compression-ratio piston according to claim 7 is characterized in that: said belleville spring assembly (3.1.2) down and steel ball bottom face in contact are provided with the conduit (3.1.2.2) of suitable steel ball (3.2) radial rolling or slip.
9. internal-combustion engine optimization type variable-compression-ratio piston according to claim 1 and 2; It is characterized in that: said piston head (1) is combined by the piston head main body (1.1) and the piston head core (1.2) of detachable; Said central position-arresting disk (3.4) is rigidly connected through centre bolt (3.6) and piston head core (1.2), and also locks through worm structure (1.2.1) between the bottom outer wall of the top counterbore of said central position-arresting disk (3.4) and piston head core (1.2) and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204461634U CN202348465U (en) | 2011-11-11 | 2011-11-11 | Optimized variable compression ratio piston for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204461634U CN202348465U (en) | 2011-11-11 | 2011-11-11 | Optimized variable compression ratio piston for internal combustion engine |
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| Publication Number | Publication Date |
|---|---|
| CN202348465U true CN202348465U (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204461634U Withdrawn - After Issue CN202348465U (en) | 2011-11-11 | 2011-11-11 | Optimized variable compression ratio piston for internal combustion engine |
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| CN (1) | CN202348465U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364076A (en) * | 2011-11-11 | 2012-02-29 | 武汉理工大学 | Optimized variable compression ratio piston of internal-combustion engine |
| CN102943717A (en) * | 2012-12-06 | 2013-02-27 | 湖南江滨机器（集团）有限责任公司 | Steel roof aluminum skirt combinational piston |
-
2011
- 2011-11-11 CN CN2011204461634U patent/CN202348465U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364076A (en) * | 2011-11-11 | 2012-02-29 | 武汉理工大学 | Optimized variable compression ratio piston of internal-combustion engine |
| CN102364076B (en) * | 2011-11-11 | 2013-07-03 | 武汉理工大学 | Optimized variable compression ratio piston of internal-combustion engine |
| CN102943717A (en) * | 2012-12-06 | 2013-02-27 | 湖南江滨机器（集团）有限责任公司 | Steel roof aluminum skirt combinational piston |
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Granted publication date: 20120725 Effective date of abandoning: 20130703 |
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