CN102439272A - Apparatus for modifying the piston kinematics of an internal combustion engine - Google Patents

Apparatus for modifying the piston kinematics of an internal combustion engine Download PDF

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Publication number
CN102439272A
CN102439272A CN2010800193536A CN201080019353A CN102439272A CN 102439272 A CN102439272 A CN 102439272A CN 2010800193536 A CN2010800193536 A CN 2010800193536A CN 201080019353 A CN201080019353 A CN 201080019353A CN 102439272 A CN102439272 A CN 102439272A
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China
Prior art keywords
piston
wrist pin
pin
connecting rod
bearing
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CN2010800193536A
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Chinese (zh)
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K·萨兹伯格
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AVL List GmbH
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AVL List GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • 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
    • F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
    • 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

Abstract

The invention relates to an apparatus for modifying the piston kinematics of an internal combustion engine having at least one piston (1) reciprocating in a cylinder, said piston being connected in a swiveling manner to a connecting rod (2) by means of a wrist pin (4), wherein the wrist pin (4) is rotatably supported in at least one wrist pin bearing (5) of the piston (1) and in a connecting rod bearing (3) of the connecting rod (2), wherein the wrist pin (4) comprises an eccentric (6) in at least one support area of the wrist pin bearing (5) and/or of the connecting rod bearing (3), and wherein the wrist pin (4) can be rotated by a rotating device. In order to limit the peak pressure in the simplest possible way, the rotating device is formed by a torsion spring (7) and the wrist pin (4) can be rotated from a rest position to at least one pressure limiting position against the force of the torsion spring (7).

Description

Be used to revise the device of the piston motion of internal-combustion engine
The present invention relates to a kind of device that is used to revise the piston motion of internal-combustion engine; This internal-combustion engine has at least one pistons reciprocating in cylinder; This piston is connected with connecting rod through wrist pin pivotally; Wherein in rotatable at least one gudgeon pin bearing that is bearing in piston of wrist pin and in the connecting rod bearing of connecting rod, wherein wrist pin has eccentric part at least one support region of gudgeon pin bearing and/or connecting rod bearing, and wrist pin is rotatable through whirligig.
Have on performance requirement very that the internal-combustion engine of longspan has following problem, in traditional crank driving mechanism, fixing compression ratio causes the span (Spreizung) of surge pressure between sub load and rated load bigger.This mainly causes diesel driven mechanism must satisfy very high surge pressure requirement, thereby causes the higher friction loss.
Patent document DE 10 2,005 055 199 A1 openly have the reciprocating internal combustion engine of at least one variable compression ratio that can regulate through controlling mechanism, and this controlling device comprises that eccentric part in the stroke bearing hole (Hublagerauge) that is arranged on connecting rod bearing hole or connecting rod is to change the effective length of connecting rod.Eccentric part can move along adjustment stroke through the moment of torsion that is caused by link motion.At this, carry out adjusting to eccentric part via controlling device.
DE 348 555 A disclose a kind of adjustable wrist pin bearing device that is used for internal-combustion engine, but wherein wrist pin is fixed in wherein sleeve eccentric rotation and fixed bearing in second sleeve prejudicially.The structure of known similar in GB412 781 A.
At DE 3 108 486 A1; JP 58-067937 A2, JP 62-035034 A2, US 4 721 073A; DE 3 818 357 A1, known other device that has the capacity eccentric bearing lining that is used for wrist pin and be used to change compression ratio among EP 0 297 904 A2 or WO 95/08705 A1.
The known devices that is used to change compression ratio has following shortcoming, that is, they need distinctive controlling mechanism, to cause the rotation of eccentric part.Thus, the cost of these devices is very high.
In addition, known reciprocating internal combustion engine from DE 40 40 274 A1 with stop of regulating according to temperature, wherein wrist pin has throw of eccentric with respect to its outwards outstanding end in the zone of tie rod holes.The wrist pin and the moment of torsion element that are supported in the piston are rigidly connected, and this torsion element is rigidly connected with piston.The moment of torsion element is processed by memory metal.Thus, cause that wrist pin is rotated according to temperature, and cause the relative displacement between connecting rod and the piston through its throw of eccentric.This controlling device is not suitable for being used for limiting the surge pressure in the cylinder chamber.
The objective of the invention is to, can peak limiting pressure in internal-combustion engine with simple as far as possible method.
Thus, the present invention realizes that whirligig is made up of torsion spring, and the power of wrist pin opposing torsion spring can be rotated to the pressure limit position from position of rest, and wherein preferably, eccentric part is arranged in the zone of connecting rod bearing.
In order to reproduce the output compression ratio, advantageously, the rotation stop of fixed piston pin is on the rotation stop of position of rest near fixed piston.
This has realized the explication of the rotational position of wrist pin.
Be quick response through the gas pressure implement device; Advantageously, spring-loaded Locking Device acts on the rotation stop (Verdrehungsanschlag) of fixed piston pin at least in position of rest, thereby wrist pin remains on position of rest; Wherein preferably; The lock block that Locking Device is pushed by the rotation stop that radially props up the fixed piston pin through pressure spring constitutes, wherein preferably, and the precompression can regulate of pressure spring.At this, lock block can have at least one starting slope (Anlauframpe), and the rotation retainer of fixed piston was crossed this starting slope when it rotated at wrist pin.
Design as follows according to the method for the invention; The wrist pin that promptly has at least one eccentric part, a rotatable supporting in piston and connecting rod at support region remains on position of rest through torsion spring; And the power of opposing torsion spring rotates to the pressure limit position when surpassing the cylinder pressure of regulation, to reduce compression ratio.
Through the precompression of torsion spring, the rotation of the wrist pin of compacting off-centre on the one hand is until the cylinder pressure of confirming.On the other hand, after chamber pressure was lower than under second level to be determined, this torsion spring supporting piston pin was reset to stop dog position.
Following the present invention will do further to explain according to accompanying drawing.Wherein:
Fig. 1 illustrates to have according to the piston of the internal-combustion engine of the device that is used to revise piston motion of the present invention sectional view along piston axis;
Fig. 2 illustrates the sectional view of this piston transverse to piston axis;
Fig. 3 is the sectional view of this piston according to accompanying drawing 1 center line III-III;
Fig. 4 is the oblique drawing of the torsion spring of this device; And
Fig. 5 is the oblique drawing of wrist pin.
Fig. 1 and 2 illustrates the piston 1 of internal-combustion reciprocating-pisto, and this piston is connected with connecting rod 2 via the wrist pin in the connecting rod bearing that is supported on connecting rod 234 pivotally.Wrist pin 4 rotatably connects through gudgeon pin bearing 5 on piston 1, and in the zone of connecting rob bushing 3, has eccentric part 6, and the axis of the central axis 6a of this eccentric part and gudgeon pin bearing hole 5a is spaced apart.This throw of eccentric is represented with e in the accompanying drawings.
Hollow wrist pin 4 is pressed against position of rest through torsion spring 7, and wherein the rotation stop 8 of fixed piston pin abuts against on the rotation stop 9 of fixed piston.Reference character 7a is the limit pin (Schenkel) of the fixed piston of torsion spring 7, and reference character 7b is the limit pin of the fixed piston pin of torsion spring 7.At this, the limit pin 7b of fixed piston pin is embedded in the groove 10 of wrist pin 4.
In addition, wrist pin 4 is through remaining on position of rest by the Locking Device 12 with lock block (Rastschieber) 11.Lock block 11 at this through being pressed against on the stop member 8 of fixed piston pin via the pressure spring 14 that screw 13 is regulated.Lock block 11 has starting slope 15, and when wrist pin 4 rotations, the rotation stop 8 of fixed piston pin is crossed starting slope 15.
At the compression stage of cylinder, be oriented in the rotation stop 9 of the wrist pin 4 that is implemented as eccentric shaft through fixed piston and Locking Device 12 fixed pistons the position, angle shown in Fig. 2 and 3
Figure BPA00001480973200031
centrifugal apart from e according to equality
Figure BPA00001480973200032
Apply moment of torsion M through gas pressure to eccentric part 6 D-gas
This moment of torsion M D-gasWith the friction torque M in the wrist pin 4 D-R-KStack.Trigger moment of torsion
Figure BPA00001480973200033
M D-ABe applicable to:
M D-A=M D-gas+ ∑ M D-R-K(2)
In the compression procedure of internal-combustion engine, the wedging action of precompression and the spring-loaded Locking Device 12 of wrist pin 4 through torsion spring 7 is by the stop member that presses against the fixed piston pin 9.
At this moment, reset torque M D-resetsBy precompression M D-reversesMoment of torsion M with spring-loaded Locking Device 12 The d-lockingForm:
M D-resets=M D-reverses+ M The d-locking(3)
If now in the combustion process, the triggering moment of torsion M that almost directly is directly proportional with chamber pressure D-AThrough reset torque M D-resetsHold facility and raise, the then power rotation of wrist pin 4 opposing torsion springs 7 is up to new balance occurring at inflection point.Through this rotation, by
Figure BPA00001480973200041
Obtain relative stroke of piston he.
This relative stroke of piston he produces expansion adiabatic in the firing chamber approx, and the driving mechanism with respect to the wrist pin with centering has reduced chamber pressure thus.
If descend again in the expansion stage chamber pressure, then the reset torque M of torsion spring 7 at present D-reversesCause wrist pin 4 along the rotation of the direction of the stop member 9 of fixed piston, up to not only locking and but also reach reset condition of spring-loaded Locking Device 12.
Through coordination parameter M D-AAnd M D-resets, the triggering pressure (for example, 120 crust (bar)) that can regulate is desired.
At this moment, desired maximal phase to stroke of piston he does
Through this equality (5), confirm the pressure decline potentiality of inflection point.
This mechanical peak pressure limit allows IC Engine Design to become the best compression ratio (ε=17 are to 20) of thermomechanics when operation at part load.This system is designed to when operation at part load, trigger moment of torsion M at present D-AThan reset torque M D-resetsLittle.When high load running, cylinder pressure surpasses triggering pressure in combustion process.Corresponding to the device that is used to revise piston motion of the present invention, in the firing chamber, produce additional volume, cause approximate adiabatic expansion thus.For he=1 millimeter to 3 millimeter, obtain for example about 20% to 50% pressure decline potentiality, limited the peak-peak pressure that produces thus.

Claims (7)

1. be used to revise the device of the piston motion of internal-combustion engine; Said internal-combustion engine has at least one pistons reciprocating (1) in cylinder; Said piston (1) can be connected with connecting rod (2) through wrist pin (4) pivotally; Wherein said wrist pin (4) is bearing at least one gudgeon pin bearing (5) of said piston (1) revolvably and in the connecting rod bearing (3) of said connecting rod (2), wherein, said wrist pin (4) has eccentric part (6) at least one support region of said gudgeon pin bearing (5) and/or said connecting rod bearing (3); And said wrist pin (4) can rotate through whirligig; It is characterized in that said whirligig is made up of torsion spring (7), and the power of said wrist pin (4) opposing torsion spring (7) rotates at least one pressure limit position from position of rest.
2. device as claimed in claim 1 is characterized in that, said eccentric part (6) is arranged in the zone of said connecting rod bearing (3).
3. according to claim 1 or claim 2 device is characterized in that the rotation stop of fixed piston pin (8) is at the rotation stop (9) of position of rest near fixed piston.
4. like each described device in the claim 1 to 3, it is characterized in that spring-loaded Locking Device (12) acts on the rotation stop (8) of fixed piston pin at least in position of rest, thereby said wrist pin (4) remains on position of rest.
5. like each described device in the claim 1 to 4; It is characterized in that; The lock block (11) that said Locking Device (12) is pushed by the rotation stop (8) that radially props up said fixed piston pin through pressure spring (14) constitutes, and preferably, can regulate the precompression of said pressure spring (11).
6. device as claimed in claim 5 is characterized in that, said lock block (11) has at least one starting slope (15), and the rotation stop of said fixed piston pin (8) is crossed said starting slope when said wrist pin (4) rotates.
7. be used to revise the method for the piston motion of internal-combustion engine; Said internal-combustion engine has at least one pistons reciprocating (1) in cylinder; Said piston can be connected with connecting rod (2) through the wrist pin (4) that is supported on revolvably in the said piston (1) and in the connecting rod (2) pivotally; It is characterized in that; The wrist pin (4) that in support region, has at least one eccentric part (6) remains on position of rest through torsion spring (7), and the power of opposing torsion spring (7) rotates to the pressure limit position to reduce compression ratio when surpassing the cylinder pressure of regulation.
CN2010800193536A 2009-04-29 2010-04-21 Apparatus for modifying the piston kinematics of an internal combustion engine Pending CN102439272A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT6572009A AT506470B1 (en) 2009-04-29 2009-04-29 DEVICE FOR MODIFYING THE PISTON KINEMATICS OF AN INTERNAL COMBUSTION ENGINE
ATA657/2009 2009-04-29
PCT/EP2010/055235 WO2010124971A1 (en) 2009-04-29 2010-04-21 Apparatus for modifying the piston kinematics of an internal combustion engine

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WO (1) WO2010124971A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107208550A (en) * 2015-01-26 2017-09-26 日立汽车系统株式会社 The actuator of link lever for internal combustion engine mechanism
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

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
DE102011111816B4 (en) 2011-08-27 2021-07-08 Volkswagen Aktiengesellschaft Device with eccentric piston pin to achieve a variable compression ratio in a reciprocating piston engine
DE102011115417A1 (en) * 2011-10-08 2013-04-11 Daimler Ag Piston arrangement for a variable compression ratio having combustion chamber of an internal combustion engine
DE102011115415A1 (en) * 2011-10-08 2013-04-11 Daimler Ag Method for variably setting a compression ratio of a combustion chamber of an internal combustion engine
FI123748B (en) * 2012-04-25 2013-10-15 Waertsilae Finland Oy Piston Pin Arrangement
DE102013225763A1 (en) * 2013-12-12 2015-06-18 Beijing Zhi KE Investment and Management Co.,Ltd. Piston rod assembly and internal combustion engine with such piston rod assembly

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JPH0176531U (en) * 1987-11-11 1989-05-24
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Publication number Priority date Publication date Assignee Title
SU661128A1 (en) * 1977-02-14 1979-05-07 Головное Специализированное Конструкторское Бюро По Двигателям Средней Мощности Internal combustion engine
US4266443A (en) * 1978-07-06 1981-05-12 Mcwhorter Edward M Articulating guide spring
JPH0176531U (en) * 1987-11-11 1989-05-24
WO2007043093A1 (en) * 2005-10-14 2007-04-19 Hipass Srl Automatic regulator of the compression-ratio for explosion engines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107208550A (en) * 2015-01-26 2017-09-26 日立汽车系统株式会社 The actuator of link lever for internal combustion engine mechanism
CN107208550B (en) * 2015-01-26 2019-09-27 日立汽车系统株式会社 The actuator of link lever for internal combustion engine mechanism
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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DE112010001815A5 (en) 2012-05-31
AT506470A2 (en) 2009-09-15
WO2010124971A1 (en) 2010-11-04
AT506470B1 (en) 2010-12-15

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Application publication date: 20120502