CN105756800A - Variable-compression ratio piston driven by cycloidal-pin wheels - Google Patents
Variable-compression ratio piston driven by cycloidal-pin wheels Download PDFInfo
- Publication number
- CN105756800A CN105756800A CN201610250662.3A CN201610250662A CN105756800A CN 105756800 A CN105756800 A CN 105756800A CN 201610250662 A CN201610250662 A CN 201610250662A CN 105756800 A CN105756800 A CN 105756800A
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- Prior art keywords
- pin
- cycloidal
- wheel
- piston
- motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
-
- 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
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Motors (AREA)
Abstract
The invention discloses a variable-compression ratio piston driven by cycloidal-pin wheels. The piston comprises a cycloidal wheel, a pin wheel, an upper piston body, a lower piston body, a motor and the like. The variable-compression ratio piston is characterized in that a check block of the upper piston body is located between two guide plates of the lower piston body and connected with the lower piston body through an extension spring. The motor is transversely placed on a motor base on the lower piston body and fixed with a motor cover. The cycloidal-pin wheel structures are fixed to a left rotor and a right rotor of the motor through circular holes in the pin wheel. An eccentric circle wheel on the cycloidal wheel makes line contact with the check block of the upper piston body. By means of rotation of the motor and the speed reduction effect of the cycloidal-pin wheel structures, the eccentric circle wheel structure on the cycloidal wheel pushes the check block on the upper piston body to change the relative position of the upper piston body and the lower piston body, and therefore the compression ratio of an engine is changed. The piston assembly is simple in structure, low in research cost, large in overload capacity, strong in impact resistance and good in reliability.
Description
Technical field
The present invention relates to a kind of automobile engine assembly, be the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive in particular.
Background technology
Changeable compression ratio technique is primarily directed to a kind of technology of engine with supercharger.Fixing compression ratio can not play the performance of electromotor, and in fact at Smaller load, during slow-speed of revolution operating, the thermal efficiency of electromotor is low, and corresponding overall efficiency is poor, at this moment can use bigger compression ratio；And at big rotating speed, when high load capacity, if compression ratio is too high, it is easy to occur detonation, and produce very big thermic load, at this moment can use less compression ratio.Along with the change of load, continuous print regulates compression ratio, it is possible to excavate the potentiality of electromotor to greatest extent so that it is effectively improves the thermal efficiency in whole operating mode, and then improves the combination property of electromotor.
The purpose of variable compression ratio is in that to improve the fuel economy of engine with supercharger.In engine with supercharger, in order to prevent its compression ratio of detonation lower than naturally aspirated engine.When low pressure, the thermal efficiency reduces, and makes fuel economy decline.Particularly in engine with supercharger, owing to supercharging level rises slowly, when low compression ratio, torque rises also very slow, forms so-called turbo lag phenomenon.That is electromotor is when the slow-speed of revolution, after pressurization, wait until electromotor accelerate to certain rotating speed after pressure charging system just play a role, in order to solve this problem, variable compression ratio is important method that is make compression ratio bring up to identical with NA engine compression ratio or exceed under the running on the lower load of low pressure；On the other hand, suitable under the high load capacity operating mode of high pressure-charging reduction compression ratio.In other words, along with the change of load continuously adjusts compression ratio, so as to be effectively improved the thermal efficiency in the whole condition range from underload to high load capacity.
Simply, the technology that these potentiality are infinite, also it is faced with the difficult problem being not less than rotary engine.Controlling compression ratio and be accomplished by more complicated structure, this can increase electromotor volume to a certain extent on the contrary, and difficulty of processing becomes big simultaneously.In addition, the problem such as abrasion, control accuracy, sealing is all very thorny.
Summary of the invention
Technical problem for above-mentioned existence, the present invention proposes the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive, simple in construction, reliable operation, R&D costs are little, change little to electromotor entirety, in particular, the present invention passes through electric machine rotation, after the decelerating effect of cycloidal-pin wheel structure, the off-centre operation wheel construction in Cycloidal Wheel promotes the block on piston upper body, change the relative position between piston upper body and piston lower body, thus realizing the change of engine compression ratio.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
The variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive, including piston upper body, piston lower body, Cycloidal Wheel, pin gear, motor, extension spring etc., it is characterised in that:
Motor is transversely arranged on the motor cabinet of piston lower body, and fixes by motor cover；The round boss of Cycloidal Wheel is placed in the circular port of pin gear, and with the circular port inscribe of pin gear, then that the abnormal cycloid of Cycloidal Wheel is just tangent with one of them circular short pin of pin gear, composition cycloidal-pin wheel mechanism；Cycloidal-pin wheel mechanism is arranged on the left and right rotor of motor by the circular hole of pin gear；Piston upper body is placed on piston lower body so that the block of piston upper body just in two guide plates, the off-centre operation wheel outer surface of Cycloidal Wheel and block linear contact lay, and piston upper body and piston lower body are connected with each other with extension spring.
It it is cylindrical base bottom described pin gear, base top edge is uniformly distributed the pin toothing of the circular short pin of odd number, base top is cast with round boss, and the center of base is drilled with fixing for rotor of a circular hole, and a segment distance is deviateed in the center of circle of circular hole and the center of circle of round boss.
Described Cycloidal Wheel top external gear flank profil is abnormal cycloid, abnormal cycloid is that the circular arc with the short pin inscribe of circle is constituted, number fewer than the pin tooth on pin gear one to two, the base of Cycloidal Wheel is the circle wheel eccentric with external gear profile, gear centre is drilled with a circular hole outside, hole drill to base upper surface, and just with the round boss inscribe of pin gear.
Described piston upper body divides section part to have downwards a big cavity, and what be close to cavity inner wall is the cuboid block of left and right symmetry.
Described piston lower body is that disjunction face has the cavity corresponding with piston upper body, the place of bottom center of cavity is cast with cuboid motor cabinet, semi-circular recesses is had above motor cabinet, it is respectively arranged with two buckles at the left and right opposite side of motor cabinet upper surface, four point of intersection at cuboid motor cabinet are each cast with rectangle guide plate, the lateral separation of two guide plates is equal to the distance between two blocks, and the fore-and-aft distance of two guide plates is equal to the length of block.
Compared with currently available technology, beneficial effects of the present invention is embodied in:
(1) variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive of the present invention, by installing the mode of motor in piston additional, electromotor entirety is changed little, and cost is low, good economy performance.
(2) variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive of the present invention, is carried out power transmission by cycloidal-pin wheel structure, and gear range is big, and transmission efficiency is high, and has bigger overload capacity and bear stronger impact property, and unfailing performance is good.
(3) variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive of the present invention, promotes the block of piston upper body to move up and down by the off-centre operation structure in Cycloidal Wheel, and stable working, compression ratio conversion is without impacting.
Accompanying drawing explanation
Fig. 1 is the piston component main sectional view when being in low compression ratio.
Fig. 2 is the B-B projection view of the main sectional view of Fig. 1 piston component.
Fig. 3 is the F-F projection view of the main sectional view of Fig. 1 piston component.
Fig. 4 is the piston component main sectional view when being in high compression ratio.
Fig. 5 is the B-B projection view of the main sectional view of Fig. 4 piston component.
Fig. 6 is the front view of pin gear design of part.
Fig. 7 is the A-A projection view of pin gear design of part front view.
Fig. 8 is the front view of Cycloidal Wheel design of part.
Fig. 9 is the A-A projection view of Cycloidal Wheel design of part front view.
Figure 10 is piston upper body part front view.
Figure 11 is the A-A projection view of piston upper body part front view.
Figure 12 is the front view of piston lower body part.
Figure 13 is the A-A projection view of piston lower body part front view.
Description of reference numerals:
1-piston upper body, 2-Cycloidal Wheel, 3-pin gear, 4-extension spring, 5-motor cover, 6-motor, 7-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.
Consult Fig. 6, Fig. 7, pin gear 3 bottom is cylindrical base, and base top exterior rim is uniform-distribution with the pin toothing of the circular short pin of odd number, is cast with round boss on base, being drilled with a circular hole in the middle of base, the center of circle of circular hole and the center of circle of round boss offset a segment distance.
Consult Fig. 8, Fig. 9, Cycloidal Wheel 2 top external gear flank profil is abnormal cycloid, abnormal cycloid is that the circular arc with the short pin inscribe of circle is constituted, number fewer than the pin tooth on pin gear 3 one to two, the base of Cycloidal Wheel 2 is the circle wheel eccentric with external gear profile, gear centre is drilled with a circular hole outside, and circular hole is drilled into base upper surface, and during assembling just with the round boss inscribe of pin gear 3.
Consulting Figure 10, Figure 11, the edge in disjunction face, piston upper body 1 is uniformly distributed four circular holes, is connected with a cylindrical stub in circular hole, and center, disjunction face, piston upper body 1 inwardly has a big inner chamber, is close to inner chamber wall and is cast with symmetrical cuboid block.
Consult Figure 12, Figure 13, the edge in piston lower body 7 disjunction face is respectively drilled with and circular hole corresponding with piston upper body 1, also same cylindrical stub it is connected with in circular hole, the inner chamber corresponding with piston upper body 1 is had at 7 points of section parts of piston lower body, inner chamber bottom center is cuboid motor cabinet, motor cabinet top has the half slot lateral arrangement for motor 6, two buckles fixing for motor cover 5 it is respectively arranged with on two long limits of motor cabinet, four of motor cabinet, angle point is each cast with a rectangle guide plate, lateral separation between guide plate is equal to the distance between two blocks, fore-and-aft distance between guide plate is equal to the length of block.
Motor 6 is bullhead motor, has self-locking performance, is made up of signal projector, single-chip microcomputer, driving device, it may be achieved motor 6 rotating, stall control.
Consulting Fig. 1, Fig. 2, Fig. 3, motor 6 is placed across on the motor cabinet of piston lower body 7, and fixes motor 6 by motor cover 5；The cylindrical boss of pin gear 3 is placed in the circular hole of Cycloidal Wheel 2, and makes it tangent, then allow on pin gear 3 one of them circular short pin just with the abnormal cycloid inscribe in Cycloidal Wheel 2, constitute cycloidal-pin wheel structure；Cycloidal-pin wheel structure is fixed on the left and right rotor of motor 6 by the circular hole on pin gear 3；Piston upper body 1 is placed on piston lower body 7, make the block of piston upper body 1 just between two guide plates, and make the off-centre operation wheel outer surface in Cycloidal Wheel 2 and block linear contact lay, then with four extension springs 4, piston upper body 1 and piston lower body 7 are strained, extension spring 4 is constantly in extended state, and can guarantee that when there is no relative distance between piston upper body 1 and piston lower body 7 under the effect of extension spring 4, piston acutely moves back and forth and piston upper body 1 and piston lower body 7 will not be made to be separated from each other.
Consult Fig. 4, Fig. 5, when electromotor needs high compression ratio, motor 6 rotates forward, the moment of torsion of motor 6 output is after the deceleration of cycloidal-pin wheel mechanism increases torsion, off-centre operation in Cycloidal Wheel 2 is taken turns relative to motor 6 rotor axis upwards eccentric rotary, due to off-centre operation wheel under the pulling force of extension spring 4 always with the block linear contact lay of piston upper body 1, so, under the guide effect of piston lower body 7 guide plate, off-centre operation wheel in Cycloidal Wheel 2 promotes block to make piston upper body 1 opposing pistons lower body 7 upwards slow shifting, extension spring 4 length, pulling force increases, engine compression ratio raises.
Consult Fig. 1, Fig. 2, Fig. 3, same, when electromotor needs low compression ratio, motor 6 rotates backward, and the off-centre operation in Cycloidal Wheel 2 is taken turns relative to the motor 6 downward eccentric rotary of rotor axis, under the pulling force of extension spring 4, block moves down, and engine compression ratio reduces.
When electromotor no longer changes compression ratio, motor 6 stops operating, and self-locking, owing to cycloidal-pin wheel structure has bigger overload capacity and bears stronger impact property, piston can be made when strenuous exercise, block acts on each circular short pin that the impulsive force in Cycloidal Wheel 2 is dispersed on pin gear 3, and the impulsive force that motor 6 rotor bears is only small.
More than the formula example for accompanying drawing is made describes; the obvious present invention implements the restriction not being subject to above-mentioned example; as long as adopting method design and the various improvement that carry out of technical scheme of the present invention, or not improved directly apply to other occasions, all in protection scope of the present invention.
Claims (6)
1. a variable-compression-ratio piston for Cycloidal pin-wheel drive, including piston upper body (1), piston lower body (7), Cycloidal Wheel (2), pin gear (3), extension spring (4) etc., it is characterised in that:
Motor (6) is transversely arranged on the motor cabinet of piston lower body (7), and fixes by motor cover (5)；Cycloidal-pin wheel mechanism is arranged on motor (6) left and right rotor by the circular hole of pin gear (3)；Piston upper body (1) overlaps with piston lower body (7) disjunction face, and make in the block of piston upper body (1) two guide plates just at piston lower body (7), off-centre operation wheel profile and the block linear contact lay of Cycloidal Wheel (2), and with extension spring (4), piston upper body (1) and piston lower body (7) are connected with each other.
2. the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive according to claim 1, it is characterized in that, the round boss of Cycloidal Wheel (2) is placed in the circular port of pin gear (3), and with the circular port inscribe of pin gear (3), then by the abnormal cycloid of Cycloidal Wheel (2) just with one of them circular short pin inscribe of pin gear (3), composition cycloidal-pin wheel mechanism.
3. the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive according to claim 1, it is characterized in that, described pin gear (3) bottom is cylindrical base, base top edge is uniformly distributed the pin toothing of the circular short pin of odd number, base top is cast with round boss, the center of base is drilled with fixing for motor (6) rotor of a circular hole, and a segment distance is deviateed in the center of circle of circular hole and the center of circle of round boss.
4. the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive according to claim 1, it is characterized in that, described Cycloidal Wheel (2) top external gear flank profil is abnormal cycloid, abnormal cycloid is that the circular arc with the short pin inscribe of circle surrounds, number fewer than the pin tooth on pin gear (3) one to two, the base of Cycloidal Wheel (2) is the circle wheel eccentric with external gear flank profil, gear centre is drilled with a circular hole outside, hole drill to base upper surface, and assembling time just with the round boss inscribe of pin gear (3).
5. the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive according to claim 1, it is characterised in that described piston upper body (1) point section part has downwards a big cavity, and what be close to cavity inner wall is the cuboid block of left and right symmetry.
6. the variable-compression-ratio piston of a kind of Cycloidal pin-wheel drive according to claim 1, it is characterized in that, described piston lower body (7) is that disjunction face has the cavity corresponding with piston upper body (1), the place of bottom center of cavity is cast with cuboid motor cabinet, semi-circular recesses is had above motor cabinet, it is respectively arranged with two buckles at the left and right opposite side of motor cabinet upper surface, four point of intersection at cuboid motor cabinet are each cast with rectangle guide plate, the lateral separation of two guide plates is equal to the distance between two blocks, and the fore-and-aft distance of two guide plates is equal to the length of block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610250662.3A CN105756800B (en) | 2016-04-20 | 2016-04-20 | A kind of variable-compression-ratio piston of Cycloidal pin-wheel drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610250662.3A CN105756800B (en) | 2016-04-20 | 2016-04-20 | A kind of variable-compression-ratio piston of Cycloidal pin-wheel drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105756800A true CN105756800A (en) | 2016-07-13 |
| CN105756800B CN105756800B (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610250662.3A Expired - Fee Related CN105756800B (en) | 2016-04-20 | 2016-04-20 | A kind of variable-compression-ratio piston of Cycloidal pin-wheel drive |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1040655A (en) * | 1989-09-09 | 1990-03-21 | 王立 | Engine with internal and external rotors revolving concentrically in same direction |
| CN1267355A (en) * | 1997-08-21 | 2000-09-20 | 费里克斯·阿诺尔德 | Rotary piston machine |
| CN1676905A (en) * | 2004-03-31 | 2005-10-05 | 本田技研工业株式会社 | Power plant including an internal combustion engine with a variable compression ratio system |
| CN2924081Y (en) * | 2006-06-29 | 2007-07-18 | 湖南文理学院 | cycloid two-phase cam sliding-teeth pump |
| JP2011185257A (en) * | 2010-03-09 | 2011-09-22 | Takashi Matsuda | Two-stroke cycloid reciprocating engine with primary compression chamber in cylinder |
| WO2015129543A1 (en) * | 2014-02-28 | 2015-09-03 | 日邦産業株式会社 | Fluid rotary machine |
| CN205592032U (en) * | 2016-04-20 | 2016-09-21 | 吉林大学 | Driven variable compression ratio piston of cycloidal -pin wheel |
-
2016
- 2016-04-20 CN CN201610250662.3A patent/CN105756800B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1040655A (en) * | 1989-09-09 | 1990-03-21 | 王立 | Engine with internal and external rotors revolving concentrically in same direction |
| CN1267355A (en) * | 1997-08-21 | 2000-09-20 | 费里克斯·阿诺尔德 | Rotary piston machine |
| CN1676905A (en) * | 2004-03-31 | 2005-10-05 | 本田技研工业株式会社 | Power plant including an internal combustion engine with a variable compression ratio system |
| CN2924081Y (en) * | 2006-06-29 | 2007-07-18 | 湖南文理学院 | cycloid two-phase cam sliding-teeth pump |
| JP2011185257A (en) * | 2010-03-09 | 2011-09-22 | Takashi Matsuda | Two-stroke cycloid reciprocating engine with primary compression chamber in cylinder |
| WO2015129543A1 (en) * | 2014-02-28 | 2015-09-03 | 日邦産業株式会社 | Fluid rotary machine |
| CN205592032U (en) * | 2016-04-20 | 2016-09-21 | 吉林大学 | Driven variable compression ratio piston of cycloidal -pin wheel |
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| CN105756800B (en) | 2018-04-06 |
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Granted publication date: 20180406 Termination date: 20190420 |