CN111156083A - Variable compression ratio mechanism and variable compression ratio engine - Google Patents
Variable compression ratio mechanism and variable compression ratio engine Download PDFInfo
- Publication number
- CN111156083A CN111156083A CN202010054259.XA CN202010054259A CN111156083A CN 111156083 A CN111156083 A CN 111156083A CN 202010054259 A CN202010054259 A CN 202010054259A CN 111156083 A CN111156083 A CN 111156083A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- compression ratio
- variable compression
- eccentric shaft
- hinged
- 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.)
- Pending
Links
Images
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
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod 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
Landscapes
- 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)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a variable compression ratio mechanism and a variable compression ratio engine, relating to the technical field of engines, wherein the mechanism comprises: the eccentric rotary part comprises a piston, an upper connecting rod, a middle connecting rod, an eccentric rotary part, a lower connecting rod and a crankshaft crank. The piston is sleeved in the piston cylinder; one end of the upper connecting rod is hinged with the piston; one end of the middle connecting rod is hinged with the other end of the upper connecting rod; the eccentric rotating part comprises a rotating disc and an eccentric shaft arranged on the rotating disc, the axis of the eccentric shaft deviates from the rotating central axis of the rotating disc by a preset distance, the eccentric shaft is hinged with the center of the middle connecting rod, and the rotating disc can rotate around the axis of the rotating disc to adjust the axis position of the eccentric shaft; one end of the lower connecting rod is hinged with the other end of the middle connecting rod; and one end of the crankshaft crank is hinged with the other end of the lower connecting rod, and the other end of the crankshaft crank is an output end of the engine crankshaft. The invention can continuously adjust the compression ratio, reduce the excitation to the engine shell and reduce the vibration of the engine and the vehicle body.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a compression ratio variable mechanism and a compression ratio variable engine.
Background
Variable compression ratio is a technique of dynamically adjusting the compression ratio of an engine. Variable compression ratio may improve fuel efficiency under different load conditions. A lower compression ratio is required at high loads, while a high compression ratio is required at low loads. In other words, the compression ratio is continuously adjusted along with the change of the load, so that the heat efficiency can be improved in the whole working condition range from low load to high working condition, and the aim of saving oil is fulfilled.
Patent No. CN107023386A discloses a variable compression ratio device and variable compression ratio engine, and this variable compression ratio device includes piston, connecting rod, pendulum rod, rotary rod, eccentric structure and bent axle, the pendulum rod has set gradually first connecting portion, second connecting portion and third connecting portion along its length direction, the one end of connecting rod articulates around first axis of rotation on the piston, the other end of connecting rod articulates around second axis of rotation on the first connecting portion, the one end of rotary rod articulates around third axis of rotation on the second connecting portion, the other end of rotary rod articulates around fourth axis of rotation on the bent pin of bent axle, eccentric structure articulates on the third connecting portion. According to the variable compression ratio device, the lower connecting rod in the existing triangular block structure form with larger volume and weight is replaced by the swing rod and the rotating rod which are lighter in weight, so that the movement quality of the whole compressible ratio device is smaller.
In the variable compression ratio device of the above patent, the eccentric structure is hinged on the third connecting part, when the mechanism operates, the centrifugal force of the third connecting part is applied on the eccentric structure, and the centrifugal force is transmitted to the engine shell, so that the engine and the vehicle body generate large vibration, and the uncomfortable feeling of a user is caused.
Disclosure of Invention
The invention aims to provide a variable compression ratio mechanism and a variable compression ratio engine, aiming at solving the problem that the engine and the vehicle body in the prior art vibrate greatly to cause discomfort for users.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a variable compression ratio mechanism for adjusting the compression ratio of a piston cylinder of an engine, comprising:
the piston is sleeved in the piston cylinder;
one end of the upper connecting rod is hinged with the piston;
one end of the middle connecting rod is hinged with the other end of the upper connecting rod;
the eccentric rotating part comprises a rotating disc and an eccentric shaft arranged on the rotating disc, the axis of the eccentric shaft deviates from the rotating central axis of the rotating disc by a preset distance, the eccentric shaft is hinged with the center of the middle connecting rod, and the rotating disc can rotate around the rotating central axis of the rotating disc to adjust the axis position of the eccentric shaft;
one end of the lower connecting rod is hinged with the other end of the middle connecting rod;
and one end of the crankshaft crank is hinged with the other end of the lower connecting rod, and the other end of the crankshaft crank is an output end of the engine crankshaft.
On the basis of the technical scheme, when the piston does up-and-down reciprocating linear motion between the upper dead point and the lower dead point:
the upper connecting rod and the lower connecting rod perform compound motion of linear and circumferential swinging;
the middle connecting rod swings around the eccentric shaft in a circle;
the crankshaft crank performs complete circular motion around the central axis of the output end of the crankshaft of the engine.
On the basis of the technical scheme, the range of the angle of the upper connecting rod swinging around the hinge point of the upper connecting rod and the piston is-5-10 degrees;
the angle range of the lower connecting rod swinging around the hinge point of the lower connecting rod and the middle connecting rod is-40-35 degrees.
On the basis of the technical scheme, the angle range of the middle connecting rod swinging around the circumference of the eccentric shaft is-20 degrees.
On the basis of the technical scheme, the deviation distance between the axis of the eccentric shaft and the rotation central axis of the turntable is 4-6 mm.
On the basis of the technical scheme, a bearing bush is arranged at the hinged part of the eccentric shaft and the middle connecting rod.
On the basis of the above technical solution, the variable compression ratio mechanism further includes a driving motor for driving the eccentric rotary member to rotate.
On the basis of the technical scheme, the driving motor is a self-locking motor.
On the basis of the technical scheme, the range of the variable compression ratio is 7.5-16.5.
The present invention also provides a variable compression ratio engine including the variable compression ratio mechanism.
Compared with the prior art, the invention has the advantages that:
the variable compression ratio mechanism and the variable compression ratio engine can continuously adjust the compression ratio according to the change of the load so as to improve the heat efficiency in the whole working condition range from low load to high load and achieve the aim of saving oil. In addition, the hinge point of the middle connecting rod and the eccentric shaft is located at the middle point of the middle connecting rod, the centrifugal force of the middle connecting rod on the eccentric rotating piece can achieve self balance, namely the resultant force of the centrifugal force is zero, the excitation on an engine shell is greatly reduced, the vibration of an engine and a vehicle body is reduced, and the comfort level of a user is improved.
Drawings
FIG. 1 is a schematic structural view of a variable compression ratio mechanism in the embodiment of the invention;
FIG. 2 is another schematic structural view of the variable compression ratio mechanism in the embodiment of the invention;
FIG. 3 is still another schematic structural view of the variable compression ratio mechanism in the embodiment of the invention;
FIG. 4 is a schematic structural view of the eccentric shaft hinged to the middle connecting rod in the embodiment of the present invention;
in the figure: 1. a piston; 2. an upper connecting rod; 3. a middle connecting rod; 4. an eccentric rotating member; 41. a turntable; 42. an eccentric shaft; 5. a lower connecting rod; 6. a crankshaft crank; 7. a bearing bush.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a variable compression ratio mechanism for adjusting the compression ratio of a piston cylinder of an engine, including: piston 1, upper connecting rod 2, middle connecting rod 3, eccentric rotating member 4, lower connecting rod 5 and crank shaft 6.
The piston 1 is sleeved in the piston cylinder and does reciprocating linear motion up and down between an upper dead point and a lower dead point. One end of the upper connecting rod 2 is hinged with the piston 1 at a point A, the other end of the upper connecting rod is hinged with one end of the middle connecting rod 3 at a point B, the other end of the middle connecting rod 3 is hinged with one end of the lower connecting rod 5 at a point D, the other end of the lower connecting rod 5 is hinged with one end of the crankshaft crank 6 at a point E, and the other end of the crankshaft crank 6 is an output end O (a rotating shaft of the crankshaft. Further, the eccentric rotary member 4 includes a rotary plate 41 and an eccentric shaft 42 provided on the rotary plate 41, an axis of the eccentric shaft 42 is deviated from a rotation central axis of the rotary plate 41 by a predetermined distance, the eccentric shaft 42 is hinged to a point C with respect to a center of the middle connecting rod 3, and the rotary plate 41 can be rotated about its own rotation central axis to adjust an axis position of the eccentric shaft 42.
The variable compression ratio mechanism of the embodiment of the invention has the following working principle:
under the working condition of variable compression ratio, according to the change of load, the angle of the rotating disk 41 is rotated, and the position of the central hinge point of the eccentric shaft 42 and the middle connecting rod 3, namely the position of the top dead center of the piston 1, is adjusted, so as to achieve the effect of adjusting the compression ratio.
Referring to fig. 2, when the eccentric shaft 42 rotates to the top, the hinge point C of the middle connecting rod 3 and the eccentric shaft 42 is at the top, and the top dead center of the piston 1 is at the top, and the compression ratio is at the maximum.
Referring to fig. 3, when the eccentric shaft 42 is rotated to the lowest position, the hinge point position C of the middle connecting rod 3 and the eccentric shaft 42 is at the lowest position, and the top dead center position of the piston 1 is at the lowest position, and the compression ratio is at the lowest.
Compared with the prior art, the variable compression ratio mechanism provided by the embodiment of the invention can continuously adjust the compression ratio according to the change of the load, so that the heat efficiency can be improved in the whole working condition range from low load to high working condition, and the purpose of saving oil is achieved. In addition, the hinge point of the middle connecting rod 3 and the eccentric shaft 42 is located at the middle point of the middle connecting rod 3, and the centrifugal force of the middle connecting rod 3 on the eccentric rotating part 4 can reach self balance, namely the resultant force of the centrifugal force is zero, so that the excitation on the engine is greatly reduced, the vibration of the engine and the vehicle body is reduced, and the comfort level of a user is improved.
Example 2
The basic contents are the same as those of embodiment 1: when the piston 1 makes up-and-down reciprocating linear motion between the upper dead point A and the lower dead point a:
the upper connecting rod 2 and the lower connecting rod 5 do compound motion of linear and circumferential swinging;
the middle connecting rod 3 does circumferential oscillation around the eccentric shaft 42;
the crankshaft crank 6 makes a complete circular motion around the crankshaft of the engine.
Example 3
The basic contents are the same as example 2: the range of the angle of the upper connecting rod 2 swinging around the hinge point of the upper connecting rod and the piston 1 is-5 to 10 degrees; the angle range of the lower connecting rod 5 swinging around the hinged point of the lower connecting rod and the middle connecting rod 3 is-40 to 35 degrees. The swinging angle of the upper connecting rod 2 or the lower connecting rod 5 refers to the included angle between the upper connecting rod 2 or the lower connecting rod 5 and the vertical direction.
Example 4
The basic contents are the same as example 2: the range of the angle of the circumferential swing of the middle connecting rod 3 is-20 to 20 degrees. Wherein, the swinging angle of the middle connecting rod 3 refers to the included angle between the middle connecting rod and the horizontal direction.
Example 5
The basic contents are the same as those of embodiment 1: the distance of the axis of the eccentric shaft 42 deviating from the axis of the turntable is 4-6 mm. Under the effect of guaranteeing eccentric regulation, the structure size is compacter.
Example 6
The basic contents are the same as those of embodiment 1: the hinging part of the eccentric shaft 42 and the middle connecting rod 3 is provided with a bearing bush 7. Referring to fig. 4, the bearing bush 7 greatly reduces the friction loss and surface wear between the eccentric shaft 42 and the middle connecting rod 3.
Example 7
The basic contents are the same as those of embodiment 1: the variable compression ratio mechanism further includes a drive motor for driving the eccentric rotary member 4 to rotate. Preferably, the drive motor is a self-locking motor.
Specifically, under the working condition of variable compression ratio, the driving motor drives the turntable 41 to rotate and adjust the position of the central hinge point of the eccentric shaft 42 and the middle connecting rod 3, namely the position of the top dead center of the adjusting piston 1, so as to achieve the effect of adjusting the compression ratio.
Under the working condition of a fixed compression ratio, the driving motor is self-locked, the eccentric shaft 42 keeps still, and the top dead center of the piston is unchanged. When the piston 1 makes up-and-down reciprocating linear motion between the upper dead point and the lower dead point, the upper connecting rod 2 and the lower connecting rod 5 make compound motion of linear and circumferential swinging. Since the eccentric shaft 42 is kept stationary, the top dead center position of the piston 1 is kept constant, and the compression ratio is kept constant in this state.
Example 8
The basic contents are the same as those of embodiment 1: the range of the variable compression ratio is 7.5-16.5, and a relatively wide compression ratio range is provided.
Example 9
The embodiment of the invention also provides a variable compression ratio engine which comprises the variable compression ratio mechanism in the embodiment.
The engine with the variable compression ratio in the embodiment of the invention can continuously adjust the compression ratio according to the change of the load by arranging the mechanism with the variable compression ratio in the embodiment, so that the heat efficiency can be improved in the whole working condition range from low load to high working condition, and the aim of saving oil is fulfilled. In addition, the hinge point of the middle connecting rod 3 and the eccentric shaft 42 is located at the middle point of the middle connecting rod 3, and the centrifugal force of the middle connecting rod 3 on the eccentric rotating part 4 can reach self balance, namely the resultant force of the centrifugal force is zero, so that the excitation on the engine is greatly reduced, the vibration of the engine and the vehicle body is reduced, and the comfort level of a user is improved.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A variable compression ratio mechanism for adjusting the compression ratio of a piston cylinder of an engine, comprising:
the piston (1) is sleeved in the piston cylinder;
an upper connecting rod (2) with one end hinged with the piston (1);
one end of the middle connecting rod (3) is hinged with the other end of the upper connecting rod (2);
the eccentric rotating part (4) comprises a rotating disc (41) and an eccentric shaft (42) arranged on the rotating disc, the axis of the eccentric shaft (42) deviates from the rotating central axis of the rotating disc (41) by a preset distance, the eccentric shaft (42) is hinged with the center of the middle connecting rod (3), and the rotating disc (41) can rotate around the rotating central axis of the rotating disc to adjust the axis position of the eccentric shaft (42);
one end of the lower connecting rod (5) is hinged with the other end of the middle connecting rod (3);
and one end of the crankshaft crank (6) is hinged with the other end of the lower connecting rod (5), and the other end of the crankshaft crank is an output end of the engine crankshaft.
2. The variable compression ratio mechanism according to claim 1, characterized in that:
the piston (1) does reciprocating linear motion up and down between an upper dead point and a lower dead point:
the upper connecting rod (2) and the lower connecting rod (5) perform compound motion of linear and circumferential swinging;
the middle connecting rod (3) swings around the eccentric shaft (42) in a circle;
the crankshaft crank (6) makes complete circular motion around the central axis of the output end of the crankshaft of the engine.
3. The variable compression ratio mechanism according to claim 2, characterized in that:
the upper connecting rod (2) swings around the hinge point of the upper connecting rod and the piston (1) within the angle range of-5 to 10 degrees;
the angle range of the lower connecting rod (5) swinging around the hinged point of the lower connecting rod and the middle connecting rod (3) is-40-35 degrees.
4. The variable compression ratio mechanism according to claim 2, characterized in that:
the angle range of the middle connecting rod (3) swinging around the circumference of the eccentric shaft (42) is-20 degrees.
5. The variable compression ratio mechanism according to claim 1, characterized in that:
the distance between the axis of the eccentric shaft (42) and the rotating central axis of the turntable (41) is 4-6 mm.
6. The variable compression ratio mechanism according to claim 1, characterized in that:
and a bearing bush (7) is arranged at the hinged part of the eccentric shaft (42) and the middle connecting rod (3).
7. The variable compression ratio mechanism according to claim 1, characterized in that:
the variable compression ratio mechanism further comprises a drive motor for driving the eccentric rotary member (4) to rotate.
8. The variable compression ratio mechanism according to claim 7, characterized in that: the driving motor is a self-locking motor.
9. The variable compression ratio mechanism according to claim 1, characterized in that: the range of the variable compression ratio is 7.5-16.5.
10. A variable compression ratio engine characterized by comprising the variable compression ratio mechanism according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054259.XA CN111156083A (en) | 2020-01-17 | 2020-01-17 | Variable compression ratio mechanism and variable compression ratio engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054259.XA CN111156083A (en) | 2020-01-17 | 2020-01-17 | Variable compression ratio mechanism and variable compression ratio engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111156083A true CN111156083A (en) | 2020-05-15 |
Family
ID=70563734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010054259.XA Pending CN111156083A (en) | 2020-01-17 | 2020-01-17 | Variable compression ratio mechanism and variable compression ratio engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111156083A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016860A (en) * | 2007-02-13 | 2007-08-15 | 天津大学 | Pressure ratio adjustable engine |
| CN101784775A (en) * | 2007-07-09 | 2010-07-21 | 斯卡尔佐汽车研究股份有限公司 | The mechanism that is used for internal-combustion piston engine |
| CN107023386A (en) * | 2017-05-17 | 2017-08-08 | 广州汽车集团股份有限公司 | Variable compression ratio device and variable compression ratio engine |
| US20170284291A1 (en) * | 2016-03-29 | 2017-10-05 | GM Global Technology Operations LLC | Independent compression and expansion ratio engine with variable compression ratio |
| EP2687707A3 (en) * | 2012-07-17 | 2018-04-04 | Wärtsilä Schweiz AG | A large reciprocating piston combustion engine, a control apparatus and a method for controlling such an engine |
| CN108104958A (en) * | 2017-12-15 | 2018-06-01 | 东风汽车集团有限公司 | A kind of motor mechanisms of novel changable compression ratio |
-
2020
- 2020-01-17 CN CN202010054259.XA patent/CN111156083A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016860A (en) * | 2007-02-13 | 2007-08-15 | 天津大学 | Pressure ratio adjustable engine |
| CN101784775A (en) * | 2007-07-09 | 2010-07-21 | 斯卡尔佐汽车研究股份有限公司 | The mechanism that is used for internal-combustion piston engine |
| EP2687707A3 (en) * | 2012-07-17 | 2018-04-04 | Wärtsilä Schweiz AG | A large reciprocating piston combustion engine, a control apparatus and a method for controlling such an engine |
| US20170284291A1 (en) * | 2016-03-29 | 2017-10-05 | GM Global Technology Operations LLC | Independent compression and expansion ratio engine with variable compression ratio |
| CN107023386A (en) * | 2017-05-17 | 2017-08-08 | 广州汽车集团股份有限公司 | Variable compression ratio device and variable compression ratio engine |
| CN108104958A (en) * | 2017-12-15 | 2018-06-01 | 东风汽车集团有限公司 | A kind of motor mechanisms of novel changable compression ratio |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6390035B2 (en) | Reciprocating internal combustion engine | |
| JP3968967B2 (en) | Variable compression ratio mechanism of reciprocating internal combustion engine | |
| US9617912B2 (en) | Multi-link engine | |
| JP3879385B2 (en) | Variable compression ratio mechanism of internal combustion engine | |
| EP1674692B1 (en) | Internal combustion engine | |
| CN107023386B (en) | Variable compression ratio device and variable compression ratio engine | |
| EP2463498A1 (en) | Crankshaft of internal combustion engine provided with multi link-type piston-crank mechanism and multi link-type piston-crank mechanism of internal combustion engine | |
| JPH09228858A (en) | Reciprocating engine | |
| CN102971506A (en) | Internal combustion engine having a multi-joint crank drive and additional masses on articulated connecting rods of the multi-joint crank drive for damping free mass forces | |
| JPH0125900B2 (en) | ||
| US4066049A (en) | Internal combustion engine having a variable engine displacement | |
| JPH0231233B2 (en) | ||
| CN111156083A (en) | Variable compression ratio mechanism and variable compression ratio engine | |
| JP2004068862A (en) | Crank shaft and engine | |
| KR20100138332A (en) | Variable compression ratio engine | |
| JP5417977B2 (en) | Vibration reduction structure of multi-link engine | |
| JP3626018B2 (en) | Directly connected reciprocating crank unit | |
| JP4628225B2 (en) | Reciprocating cylinder device with variable compression ratio | |
| CN108252800A (en) | Internal-combustion piston engine variable compression ratio regulating device | |
| WO2004053345A1 (en) | Crank mechanism of combustion engine___________________ | |
| US4492126A (en) | Variable leverage oil field pump jack | |
| CN208010467U (en) | Internal-combustion piston engine variable compression ratio regulating device | |
| US5568762A (en) | Stabilizing device for variable displacement axial piston pumps | |
| JP3426113B2 (en) | Reciprocating piston mechanism | |
| JP5126100B2 (en) | Double link mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200515 |