CN109578138A - Compression ratio mechanism and its working method - Google Patents
Compression ratio mechanism and its working method Download PDFInfo
- Publication number
- CN109578138A CN109578138A CN201811440361.2A CN201811440361A CN109578138A CN 109578138 A CN109578138 A CN 109578138A CN 201811440361 A CN201811440361 A CN 201811440361A CN 109578138 A CN109578138 A CN 109578138A
- Authority
- CN
- China
- Prior art keywords
- compression ratio
- connecting rod
- hydraulic cavities
- oil duct
- lock piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/048—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable crank stroke length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/03—Controlling by changing the compression ratio
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The present invention provides a kind of compression ratio mechanism, comprising: connecting rod, the both ends of the connecting rod are respectively first end and second end；The first end of connecting rod is equipped with circular cavity for connecting piston in the first end；Eccentric part is set in the cavity of the connecting rod first end, and can circumferentially rotate；Eccentric part and connecting rod first end are commonly through piston pin connection piston；It is rotated by the eccentric part, the length for changing piston pin center to connecting rod second end center achievees the purpose that change compression ratio to change the position of piston top dead center；It is set to the first hydraulic cavities and the second hydraulic cavities of connecting rod first end；An eccentric part locking unit is respectively equipped in first hydraulic cavities and the second hydraulic cavities；The first oil duct with the first hydraulic chamber into communication is respectively equipped in connecting rod, the second oil duct with the second hydraulic chamber into communication.The present invention can switch compression ratio according to engine operation condition, not only improve engine power output, and achieve energy-saving and emission reduction purposes.
Description
Technical field
The present invention relates to technical field of engines, especially a kind of compression ratio mechanism.
Background technique
More engine chamber compression ratio is immutable at present, can not solve the contradiction between oil consumption and pinking.
The compression ratio mechanism of the prior art drives eccentric wheel to change connecting rod by complicated hydraulic piston and push rod
Length is to change compression ratio, but its structure is excessively complicated, and manufacturing cost is high, it is difficult to control.
Although cause in the prior art engine chamber compression ratio be it is variable, structure is complicated, and cost is very high, reliably
Poor, the scheme performance difficulty of property.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of compression ratio mechanisms, can
Switch compression ratio according to engine operation condition to achieve energy-saving and emission reduction purposes to improve engine thermal efficiency.The present invention adopts
Technical solution is:
A kind of compression ratio mechanism, comprising:
Connecting rod, the both ends of the connecting rod are respectively first end and second end；The first end of connecting rod for connecting piston, and this first
Circular cavity is equipped in end；
Eccentric part is set in the cavity of the connecting rod first end, and can circumferentially rotate；Eccentric part and connecting rod first end
Commonly through piston pin connection piston；It is rotated by the eccentric part, changes piston pin center to connecting rod second end center
Length achievees the purpose that change compression ratio to change the position of piston top dead center；
It is set to the first hydraulic cavities and the second hydraulic cavities of connecting rod first end；It is respectively equipped in first hydraulic cavities and the second hydraulic cavities
One eccentric part locking unit；
The eccentric part includes the eccentric pin hole ring body matched with circular cavity, on the outer wall of the eccentric pin hole ring body
Separately an angle sets that there are two the locking holes that match with the eccentric part locking unit；
The first oil duct with the first hydraulic chamber into communication is respectively equipped in the connecting rod, the second oil duct with the second hydraulic chamber into communication.
Specifically, the eccentric part locking unit includes lock piece and elastic element；One end of lock piece is protruded into hydraulic
In the hole that chamber is connected with circular cavity；Elastic element is arranged at the top of hydraulic cavities between the lock piece other end；Lock piece it is another
One end and hydraulic cavity wall couple cooperate.
More preferably, in hydraulic cavities, the locating part for being limited to the lock piece, the locating part position are additionally provided with
Between the lock piece other end and hydraulic cavities bottom.
More preferably, the outer wall circumferential surface of the eccentric pin hole ring body is equipped with guide groove；Described two locking holes are located at
The both ends slot bottom of guide groove；Lock piece one end is directed at the guide groove setting.
Further, the oil duct includes the vertical oil duct unit and oblique oil duct unit being connected, vertical oil duct unit
The second end of connecting rod is led in one end, and the other end connects with oblique oil duct unit one end, the other end of oblique oil duct unit with it is hydraulic
The bottom of chamber side wall is connected.
Further, two hydraulic cavities are along the angle setting of one, connecting rod first end outer circle interval；Described two locking holes
Interval angles are greater than two hydraulic cavities along the interval angles of connecting rod first end outer circle.
More preferably, for lock piece in reset state, one bulge quantity S of connecting rod one end inner circle is inserted into lock piece one end.
Further, lock piece uses lock pin or lockup piston.
Further, the locating part uses elastic spacing one.
Further, the compression ratio mechanism further includes control module, for controlling filling for first oil duct
Oil or draining control the oil-filled or draining of second oil duct.
Further, eccentric part uses eccentric wheel.
The present invention has the advantages that
1) overall structure is simple, smaller to available engine change, and the cost of realization is low；
2) mechanism can realize the flexible switching of height compression ratio, improve hair according to the actual operating mode needs of engine
The thermal efficiency of motivation not only improves engine power output, and achieves energy-saving and emission reduction purposes.
Detailed description of the invention
Fig. 1 is high compression ratio status architecture schematic diagram of the invention.
Fig. 2 is low compression ratio status architecture schematic diagram of the invention.
Fig. 3 is oil duct arrangement schematic diagram on connecting rod of the invention.
Fig. 4 is lock piece reset state schematic diagram of the invention.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1, a kind of compression ratio mechanism provided by the invention, comprising: piston 1, connecting rod 2, piston pin 3, partially
Center portion part 4, eccentric part locking unit, circlip 8 and a control module；
The both ends of the connecting rod 2 are respectively first end and second end；Wherein first end is commonly called as small head end, for connecting piston 1,
And circular cavity 201 is equipped in the first end；The second end of connecting rod is commonly called as stub end, for connecting crankshaft；
Using an eccentric wheel in described 4 the present embodiment of eccentric part；The eccentric wheel has to match with circular cavity 201
The eccentric pin hole ring body of conjunction；Therefore work as and be set in the cavity 201 of the connecting rod first end, it will be able to circumferentially rotate；Eccentric wheel
Piston 1 is connected commonly through piston pin 3 with 2 first end of connecting rod；It is rotated by the eccentric part, changes piston pin center to company
The length at bar second end center changes the height of compression clearance to change the position of piston top dead center, reach change compression
The purpose of ratio；
In the first end of connecting rod, the first hydraulic cavities C1 and the second hydraulic cavities C2 are further respectively had；First hydraulic cavities C1 and the second liquid
An eccentric part locking unit is respectively equipped in pressure chamber C2；Two hydraulic cavities C1, C2 are along 2 one, first end outer circle interval of connecting rod
Angle setting；
Separately an angle is set there are two matching with the eccentric part locking unit on the outer wall of the eccentric pin hole ring body
Locking hole L, H；The interval angles of described two locking hole L, H are greater than two hydraulic cavities C1, C2 along 2 first end outer circle of connecting rod
Interval angles.Locking hole L is the first locking hole, and locking hole H is the second locking hole；
The first oil duct A being connected to the first hydraulic cavities C1, second be connected to the second hydraulic cavities C2 are respectively equipped in the connecting rod 2
Oil duct B；First oil duct A or the second oil duct B respectively includes the vertical oil duct unit and oblique oil duct unit being connected, vertical oil duct
The second end of connecting rod 2 is led in unit one end, and the other end connects with oblique oil duct unit one end, the other end of oblique oil duct unit with
The bottom of hydraulic cavities side wall is connected.
The eccentric part locking unit includes lock piece 6 and elastic element 7；Wherein lock piece 6 can be used lock pin or
Spring can be used in lockup piston, elastic element 7；One end of lock piece 6 is protruded into the hole that hydraulic cavities are connected with circular cavity 201；
Spring 7 is arranged at the top of hydraulic cavities between 6 other end of lock piece；The other end of lock piece 6 and hydraulic cavity wall couple cooperate.
Lock piece 6 can be slided along the cavity wall of hydraulic cavities, and when oil-filled in oil duct, lock piece 6 can be inserted under the pressure of hydraulic oil
In locking hole on 4 outer wall of eccentric part, thus by eccentric part and connecting rod first end locking.
As a preferred technical solution of the present invention, in hydraulic cavities, it is additionally provided with for limiting the lock piece 6
The circlip 8 of position, the circlip 8 is located between 6 other end of lock piece and hydraulic cavities bottom, and is embedded in hydraulic cavities side wall
Fitting groove in.Under spring force effect, when lock piece 6 is resetted from locking hole, progress can be kept out by circlip 8
Limit, prevents 6 one end of lock piece from deviating from from the hole that hydraulic cavities are connected with circular cavity 201；Circlip 8 can also be to reset
Lock piece play buffer function；In other embodiments, circlip 8 can also be replaced using elastic sheet metal, elasticity
Sheet metal has hole or there are gaps to pass through for hydraulic oil between hydraulic cavity wall.
As a preferred technical solution of the present invention, the outer wall circumferential surface of the eccentric pin hole ring body is equipped with guide groove K；
Described two locking hole L, H are located at the both ends slot bottom of guide groove K；Lock piece 6 is directed at the guide groove K setting.
Control module is used to control the oil-filled or draining of the first oil duct A, controls the oil-filled of the second oil duct B or lets out
Oil.
The status of eccentric part 4 shown in Fig. 1 corresponds to mechanism high compression ratio state, when monitoring detonation signal, machine
Structure needs to be switched to low compression ratio state as high compression ratio state (shown in Fig. 1) (shown in Fig. 2)；Second oil duct B is disconnected and draining,
Second hydraulic cavities C2 pressure reduces, and the lock piece 6 in the second hydraulic cavities C2 is under the action of 7 elastic force of elastic element from the second locking
Hole H resets, and eccentric part 4 rotates under explosion pressure effect along the inner circle of 2 first end of connecting rod；Meanwhile first hydraulic cavities C1 with
First oil duct A connection, and pressure is established, the first hydraulic cavities C1 pressure increases, and pushes the lock piece insertion in the first hydraulic cavities C1
In first locking hole L, locking eccentric part 4, mechanism is switched to low compression ratio state as high compression ratio state (shown in Fig. 1)；
The status of eccentric part 4 shown in Fig. 2 corresponds to mechanism low compression ratio state, when engine is in starting or middle-low load
When operating condition, mechanism can be switched to high compression ratio state (shown in Fig. 1) as low compression ratio state (shown in Fig. 2), and the first oil duct A is disconnected
Open and draining, the first hydraulic cavities C1 pressure reduces, the lock piece in the first hydraulic cavities C1 under the action of elastic element elastic force from
First locking hole L resets, and eccentric part 4 rotates backward under inertia force effect along the inner circle of 2 first end of connecting rod；Meanwhile second
Hydraulic cavities C2 and the second oil duct B connection, and pressure is established, the second hydraulic cavities C2 pressure increases, and pushes in the second hydraulic cavities C2
Lock piece is inserted into the second locking hole H, and locking eccentric part 4, mechanism is switched to high compression as low compression ratio state (shown in Fig. 2)
Compare state.
When mechanism carries out the switching of height compression ratio state, eccentric part 4 is under the action of explosive force or inertia force even
Rotation in 2 first end of bar, for the stability and reliability for keeping eccentric wheel rotation work, lock piece 6 is in reset state, locking
6 one end of part can be inserted into 2 one end inner circle of connecting rod, one bulge quantity S.S can use 1mm~5mm.To which 6 one end end of lock piece can be in
In guide groove K.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (11)
1. a kind of compression ratio mechanism characterized by comprising
The both ends of connecting rod (2), the connecting rod (2) are respectively first end and second end；The first end of connecting rod is for connecting piston
(1), circular cavity (201) and in the first end are equipped with；
Eccentric part (4) is set in the cavity (201) of the connecting rod first end, and can circumferentially rotate；Eccentric part (4)
Piston (1) is connected commonly through piston pin (3) with connecting rod first end；It is rotated by the eccentric part, changes piston pin center
To the length at connecting rod second end center, to change the position of piston top dead center, achieve the purpose that change compression ratio；
It is set to the first hydraulic cavities (C1) and the second hydraulic cavities (C2) of connecting rod first end；First hydraulic cavities (C1) and second hydraulic
An eccentric part locking unit is respectively equipped in chamber (C2)；
The eccentric part (4) includes the eccentric pin hole ring body matched with circular cavity (201), the eccentric pin hole ring body
Outer wall on separately an angle set that there are two the locking holes (L, H) that match with the eccentric part locking unit；
It is respectively equipped with the first oil duct (A) being connected to the first hydraulic cavities (C1) in the connecting rod (2), even with the second hydraulic cavities (C2)
Logical the second oil duct (B).
2. compression ratio mechanism as described in claim 1, which is characterized in that
The eccentric part locking unit includes lock piece (6) and elastic element (7)；Hydraulic cavities are protruded into one end of lock piece (6)
In the hole being connected with circular cavity；Elastic element (7) is arranged at the top of hydraulic cavities between lock piece (6) other end；Lock piece
(6) the other end and hydraulic cavity wall couple cooperates.
3. compression ratio mechanism as claimed in claim 2, which is characterized in that
In hydraulic cavities, it is additionally provided with the locating part for being limited to the lock piece (6), the locating part is located at lock piece
(6) between the other end and hydraulic cavities bottom.
4. compression ratio mechanism as claimed in claim 2 or claim 3, which is characterized in that
The outer wall circumferential surface of the eccentric pin hole ring body is equipped with guide groove (K)；Described two locking holes (L, H) are located at guiding
The both ends slot bottom of slot (K)；Lock piece (6) one end is directed at guide groove (K) setting.
5. compression ratio mechanism as claimed in claim 1,2 or 3, which is characterized in that
The oil duct includes the vertical oil duct unit and oblique oil duct unit being connected, and connecting rod is led in vertical oil duct unit one end
Second end, the other end connect with oblique oil duct unit one end, the bottom phase of the other end and hydraulic cavities side wall of oblique oil duct unit
Connection.
6. compression ratio mechanism as claimed in claim 1,2 or 3, which is characterized in that
Two hydraulic cavities (C1, C2) are along the angle setting of one, connecting rod (2) first end outer circle interval；The interval of described two locking holes
Angle is greater than two hydraulic cavities (C1, C2) along the interval angles of connecting rod (2) first end outer circle.
7. compression ratio mechanism as claimed in claim 2 or claim 3, which is characterized in that
For lock piece (6) in reset state, connecting rod (2) one end one bulge quantity S of inner circle is inserted into lock piece (6) one end.
8. compression ratio mechanism as claimed in claim 2 or claim 3, which is characterized in that
Lock piece (6) uses lock pin or lockup piston.
9. compression ratio mechanism as claimed in claim 3, which is characterized in that
The locating part uses elastic spacing one.
10. compression ratio mechanism as claimed in claim 1,2 or 3, which is characterized in that
Further include control module, for controlling the oil-filled or draining of first oil duct, control the oil-filled of second oil duct or
Draining.
11. a kind of working method of compression ratio mechanism, which is characterized in that
When monitoring detonation signal, mechanism needs to be switched to low compression ratio state by high compression ratio state；Second oil duct B is disconnected
And draining, the second hydraulic cavities C2 pressure reduce, the lock piece in the second hydraulic cavities C2 is under the action of elastic element elastic force from the
Two locking hole H reset, and eccentric part 4 rotates under explosion pressure effect along the inner circle of 2 first end of connecting rod；Meanwhile first is hydraulic
Chamber C1 and the first oil duct A connection, and pressure is established, the first hydraulic cavities C1 pressure increases, and pushes the locking in the first hydraulic cavities C1
Part is inserted into the first locking hole L, and locking eccentric part 4, mechanism is switched to low compression ratio state by high compression ratio state；
When engine is in starting or middle-low load working condition, mechanism is switched to high compression ratio state by low compression ratio state, the
One oil duct A is disconnected and draining, and the first hydraulic cavities C1 pressure reduces, and the lock piece in the first hydraulic cavities C1 is in elastic element elastic force
It is resetted under effect from the first locking hole L, eccentric part 4 rotates backward under inertia force effect along the inner circle of 2 first end of connecting rod；Together
When, the second hydraulic cavities C2 and the second oil duct B connection, and pressure is established, the second hydraulic cavities C2 pressure increases, and pushes the second hydraulic cavities
Lock piece in C2 is inserted into the second locking hole H, and locking eccentric part 4, mechanism is switched to high compression ratio by low compression ratio state
State.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440361.2A CN109578138A (en) | 2018-11-29 | 2018-11-29 | Compression ratio mechanism and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811440361.2A CN109578138A (en) | 2018-11-29 | 2018-11-29 | Compression ratio mechanism and its working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109578138A true CN109578138A (en) | 2019-04-05 |
Family
ID=65925475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811440361.2A Pending CN109578138A (en) | 2018-11-29 | 2018-11-29 | Compression ratio mechanism and its working method |
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| Country | Link |
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| CN (1) | CN109578138A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963243A (en) * | 2021-03-23 | 2021-06-15 | 一汽解放汽车有限公司 | Variable compression ratio mechanism of engine and control method |
| US20210332747A1 (en) * | 2020-04-23 | 2021-10-28 | FEV Group GmbH | Connecting rod for changing a compression ratio of an internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4830517A (en) * | 1987-06-01 | 1989-05-16 | Toyota Jidosha Kabushiki Kaisha | Device for locking rotation of an eccentric bearing of a compression ratio changing device |
| JPH11257110A (en) * | 1998-03-12 | 1999-09-21 | Toyota Motor Corp | Compression ratio switching device for internal combustion engine |
| CN104533636A (en) * | 2014-11-05 | 2015-04-22 | 张素英 | Variable-compression ratio system of engine and control method of variable-compression ratio system |
| CN107529584A (en) * | 2017-09-30 | 2018-01-02 | 中国第汽车股份有限公司 | A kind of variable connecting rod of length |
| CN107882861A (en) * | 2017-09-30 | 2018-04-06 | 中国第汽车股份有限公司 | The connecting rod that a kind of length with eccentric part can become |
-
2018
- 2018-11-29 CN CN201811440361.2A patent/CN109578138A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4830517A (en) * | 1987-06-01 | 1989-05-16 | Toyota Jidosha Kabushiki Kaisha | Device for locking rotation of an eccentric bearing of a compression ratio changing device |
| JPH11257110A (en) * | 1998-03-12 | 1999-09-21 | Toyota Motor Corp | Compression ratio switching device for internal combustion engine |
| CN104533636A (en) * | 2014-11-05 | 2015-04-22 | 张素英 | Variable-compression ratio system of engine and control method of variable-compression ratio system |
| CN107529584A (en) * | 2017-09-30 | 2018-01-02 | 中国第汽车股份有限公司 | A kind of variable connecting rod of length |
| CN107882861A (en) * | 2017-09-30 | 2018-04-06 | 中国第汽车股份有限公司 | The connecting rod that a kind of length with eccentric part can become |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210332747A1 (en) * | 2020-04-23 | 2021-10-28 | FEV Group GmbH | Connecting rod for changing a compression ratio of an internal combustion engine |
| US11635019B2 (en) * | 2020-04-23 | 2023-04-25 | FEV Group GmbH | Connecting rod for changing a compression ratio of an internal combustion engine |
| CN112963243A (en) * | 2021-03-23 | 2021-06-15 | 一汽解放汽车有限公司 | Variable compression ratio mechanism of engine and control method |
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Application publication date: 20190405 |
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