FR2626943A1 - Crankshaft with a stiffened crank pin - Google Patents

Crankshaft with a stiffened crank pin Download PDF

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Publication number
FR2626943A1
FR2626943A1 FR8801479A FR8801479A FR2626943A1 FR 2626943 A1 FR2626943 A1 FR 2626943A1 FR 8801479 A FR8801479 A FR 8801479A FR 8801479 A FR8801479 A FR 8801479A FR 2626943 A1 FR2626943 A1 FR 2626943A1
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Prior art keywords
seal
crankshaft
crank pin
gravity
order
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FR2626943B1 (en
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Classifications

    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention relates to a crankshaft for a V engine with a two-stroke combustion cycle driving a pair of connecting rods and including, at the middle of the big end crank pin, a sealing disc whose centre of gravity with respect to its axis of rotation is off-centred in order to stiffen the crank pin as it deforms. It consists on the one hand of the conventional elements, the ends 1 and 2, the balancing cheeks 3 and 4, the crank pin 5 and, on the other hand, of the sealing disc 6 having a centre of gravity G which is off-centred with respect to the geometric axis of rotation 7 and its seal 8 separating the two pump cases 9 and 10. During the rotation of the crankshaft the deformation of the crank pin under the action of the big ends is minimized, in absolute value, by the action of centrifugal force created by the sealing disc and acting on the middle of the crank pin. The crankshaft according to the invention is particularly appropriate for the design of engines using a "two-stroke" cycle having an even number of cylinders arranged in a V configuration such as a V2 or V4 for example.

Description

VILEBREQUIN A MANETON RAIDI
La présente invention concerne un vilebrequin pour moteur bicylindre cycle de combustion deux temps entrainant un couple de bielles et comportant en milieu du maneton de tete de bielle, un disque d'étanchéité dont le centre de gravité est excentré par rapport à son axe géométrique de rotation afin de raidir le maneton lors de sa déformation.RAIDI CRANKSHAFT
The present invention relates to a crankshaft for a two-cylinder two-stroke combustion cycle engine driving a couple of connecting rods and comprising, in the middle of the connecting rod crankpin, a sealing disc whose center of gravity is eccentric relative to its geometric axis of rotation in order to stiffen the crankpin during its deformation.

Les moteurs thermiques d'architecture dite en vé et à cycle de combustion deux temps comportent, traditionnellement, un palier supplémentaire entre les deux bielles qui a la facheuse conséquence d'augmenter l'encombrement et d'accroitre le niveau de vibration du moteur. I1 existe cependant des moteurs deux temps avec flasque d'étanchéité disposé sur le maneton de tete de bielle pourvu d'un dispositif d'étanchéité précaire au niveau de ce disque (car localement interrompu) et s'usant rapidement du fait de la déformation du maneton soumis aux efforts d'inertie des bielles. Thermal engines of so-called vee architecture and two-stroke combustion cycle, traditionally comprise an additional bearing between the two rods which has the annoying consequence of increasing the size and increasing the vibration level of the engine. There are, however, two-stroke engines with a sealing flange arranged on the crankpin of the connecting rod end provided with a precarious sealing device at the level of this disc (because locally interrupted) and which wear out quickly due to the deformation of the crankpin subjected to the inertia forces of the connecting rods.

Le dispositif selon l'invention permet de remédier à ces inconvénients. The device according to the invention overcomes these drawbacks.

Plus précisément, l'invention concerne un vilebrequin pour moteur thermique à cycle deux temps du type qui comporte un disque d'étanchéité entre les deux carter-pompes des cylindres, solidaire du maneton de tette de bielle. Le disque d'étanchéité du vilebrequin est agencé sur le milieu du maneton de tete de bielle et son centre de gravité se trouve à l'opposé du maneton par rapport à l'axe géométrique de rotation , sa périphérie étant pourvue de portées de joint. L'etancheite est réalisée à laide d'un joint à levures pinçant les portées de joint du disque d'étanchéité et muni sur sa périphérie externe en regard avec le carter-moteur d'un élastomère qui complète l'étanchéité entre les deux carter-pompes. L'effet dynamique de l'excentration du centre de gravité du disque d'étanchéité associée à la valeur de sa masse a pour but de raidir dans sa déformation le maneton de tète de bielle qui est aussi soumis à l'action des forces d'inertie engendrées par les équipages mobiles atelés au maneton ou des forces de pression dues à l'explosion des gaz.More specifically, the invention relates to a crankshaft for a two-cycle cycle heat engine of the type which comprises a sealing disc between the two pump-casings of the cylinders, integral with the crankpin of the connecting rod. The crankshaft sealing disc is arranged on the middle of the connecting rod crankpin and its center of gravity is opposite the crankpin relative to the geometric axis of rotation, its periphery being provided with joint seats. Sealing is carried out using a yeast seal pinching the sealing surfaces of the sealing disc and provided on its outer periphery facing the crankcase with an elastomer which completes the seal between the two crankcases. pumps. The purpose of the dynamic effect of the eccentricity of the center of gravity of the sealing disc associated with the value of its mass is to stiffen in its deformation the crank pin of the connecting rod which is also subjected to the action of the forces of inertia generated by the moving parts harnessed to the crankpin or from the pressure forces due to the explosion of the gases.

I1 est avantageux que les masselottes occasionnant l'excentration du centre de gravité soient rapportees sur le disque d'étanchéité afin de permettre la rectification du maneton de tète de bielle. I1 is advantageous that the weights causing the eccentricity of the center of gravity are attached to the sealing disc in order to allow the crankpin of the connecting rod head.

Dans une variante au joint détanchéité il est avantageux que les portées de joint et les lèvres du joint ne soient pas en contact et fassent office de labyrinthe occasionnant ainsi une perte de charge s'opposant au passage des gaz d'un carter-pompe vers l'autre. In a variant of the seal it is advantageous that the seal bearing surfaces and the lips of the seal are not in contact and act as a labyrinth thus causing a pressure drop opposing the passage of gases from a pump casing towards the 'other.

De préférence, la profondeur de l'évidement entre les lèvres du joint permet son montage par déformation latérale et radiale du joint pour éviter sa coupe. Preferably, the depth of the recess between the lips of the seal allows it to be mounted by lateral and radial deformation of the seal to avoid cutting it.

La faible épaisseur des lèvres d'étanchéité du joint permet, par leur flexion et leur appui sur les portees du joint, lors de l'accroissement de pression à l'intérieur du carter-pompe, d'augmenter leur efficacité et de compenser leurs usures. The small thickness of the sealing lips of the seal allows, by their bending and their support on the bearing surfaces of the seal, during the increase in pressure inside the pump housing, to increase their efficiency and to compensate for their wear. .

Il est avantageux que le joint à lèvres se compose de deux anneaux à lèvres circulaires permettant un montage axial des lèvres en prenant en sandwich les portées du joint sur le vilebrequin et d'un joint élastomère coopérant grâce a des moyens disposés sur la périférie externe des lèvres avec le carter-pompe pour procurer un rappel élastique des lèvres contre les portées de joint. It is advantageous for the lip seal to consist of two circular lip rings allowing axial mounting of the lips by sandwiching the bearing surfaces of the seal on the crankshaft and of an elastomer seal cooperating by means of means disposed on the external periphery of the lips with the pump housing to provide an elastic return of the lips against the seal surfaces.

D'autres caractéristiques et avantages ressortiront mieux de la description qui va suivre
- La figure 1 est une vue du vilebrequin selon l'invention.Other characteristics and advantages will emerge more clearly from the description which follows
- Figure 1 is a view of the crankshaft according to the invention.

- La figure 2 est une variante au joint d'étanchéité du vilebrequin. - Figure 2 is a variant of the crankshaft seal.

- La figure 1 représente le vilebrequin qui est constitué des éléments suivants
- De joues de vilebrequin (3) (4) munies respectivement d'arbres de sorties (1) (2) qui matérialisent l'axe géométrique de rotation (7),
- D'un maneton de tète de bielle (5) reliant les deux joues de vilebrequin et faisant office de manivelle actionnée par les bielles,
- D'un disque d'étanchéité (6) qui s'intègre sur le milieu du maneton de tète de bielle (5) présentant des portées de joint (11) et des masselottes (13) qui excentrent de la valeur (E) la position du centre de gravite (G) de l'ensemble par rapport à l'axe géométrique de rotation (7),
- D'un joint à lèvres (B) dont les lèvres s'appuient sur les portées de joint (11) d'une part et équipe d'un élastomère (14) assurant l'étanchéité avec le carter-moteur (12) d'autre part afin de séparer les deux carter-pompes (9) et (10).- Figure 1 shows the crankshaft which consists of the following elements
- Crankshaft cheeks (3) (4) respectively provided with output shafts (1) (2) which materialize the geometric axis of rotation (7),
- A connecting rod crankpin (5) connecting the two crankshaft cheeks and acting as a crank operated by the connecting rods,
- A sealing disc (6) which is integrated on the middle of the crank pin of the connecting rod (5) having joint surfaces (11) and weights (13) which offset the value (E) the position of the center of gravity (G) of the assembly relative to the geometric axis of rotation (7),
- A lip seal (B), the lips of which bear on the seal bearing surfaces (11) on the one hand and is fitted with an elastomer (14) sealing with the crankcase (12) d on the other hand in order to separate the two pump housing (9) and (10).

La figure 2 représente le système d'étanchéité des deux carter-pompes se composant de deux anneaux a lèvres circulaires (8L) et (BR) comportant des moyens (15) coopérant avec le joint (16) en appui sur le carter-pompes (12). FIG. 2 represents the sealing system of the two pump-housing consisting of two rings with circular lips (8L) and (BR) comprising means (15) cooperating with the seal (16) bearing on the pump-housing ( 12).

Le materiau utilisé pour la conception du vilebrequin est un acier dont la résistance élastique à la traction est de l'ordre de 70 à 150 décanewtons par millimètre carré après traitement thermique ; les portées de joint (11) doivent étre rectifiées afin de réduire l'usure du joint pendant la période de rodage. The material used for the design of the crankshaft is a steel whose elastic tensile strength is of the order of 70 to 150 decanewtons per square millimeter after heat treatment; the seal surfaces (11) must be adjusted to reduce wear on the seal during the running-in period.

Le joint à lèvres (8) est en matériau semi-rigide comme le nylon lui permettant de retrouver sa forme initiale après la déformation lors du montage.L'élastomère (14) adherise au joint d'une part et en contact avec le carter-moteur de l'autre devra entre un silicone supportant l'ambiance thermique et huileuse de fonctionnement du moteur . Les masselottes (13)
quant à elles peuvent étre du mème matériau ou d'un matériau plus
dense rapporté comme le tungstène.The lip seal (8) is made of semi-rigid material such as nylon allowing it to regain its initial shape after deformation during assembly. The elastomer (14) adheres to the seal on the one hand and in contact with the casing. motor on the other must between a silicone supporting the thermal and oily environment of engine operation. Weights (13)
as for them can be of the same material or of a material more
dense reported as tungsten.

I1 est entendu que le vilebrequin est représente à titre d'exemple préférentiel et qu'on pourra apporter toute équivalence technique en
assemblant différemment ses éléments constitutifs sans sortir du cadre de
l'invention.It is understood that the crankshaft is shown by way of preferred example and that any technical equivalence may be made in
assembling its constituent elements differently without departing from the framework of
the invention.

Le vilebrequin selon l'invention s'utilise sur des moteurs dont l'angle du ve varie de 180 degrés à 40 degrés et se caracterise également pour un moteur tournant à faible régime de rotation, en ce que le centre de gravité (G) du disque et des masselottes est excentré, par rapport à l'axe géométrique de rotation, du coté opposé au maneton affin d'y contrecarrer les efforts d'inertie engendrés par les masses attelées au maneton; il se caractérise enfin, pour un moteur tournant à haut régime de rotation, en ce que le centre de gravité (G) du disque et des masselottes est excentré par rapport à l'axe géométrique de rotation, du meme cote que le maneton affin d'y contrecarrer les efforts de pression.  The crankshaft according to the invention is used on engines whose angle of the ve varies from 180 degrees to 40 degrees and is also characterized for an engine running at low rotational speed, in that the center of gravity (G) of the disc and weights is eccentric, relative to the geometric axis of rotation, on the side opposite the crankpin in order to counteract the inertial forces generated by the masses coupled to the crankpin; Finally, it is characterized, for an engine running at high rotational speed, in that the center of gravity (G) of the disc and the flyweights is eccentric relative to the geometric axis of rotation, on the same side as the crankpin affin d 'thwart pressure efforts.

Claims (7)

-REVEHDICATIONS--REVEHDICATIONS- 1/ Vilebrequin pour moteur bicylindre à cycle deux temps du type comportant un disque d'étanchéité, entre les deux carter-pompes, solidaire du maneton de tete de bielle caractérisé en ce qu'il comporte en un ensemble - Un disque d'étanchéité (6) doté de masselottes (13), agencé sur le milieu du maneton de tète de bielle (5) dont le centre de gravité (G) est désaxé par rapport à l'axe géométrique de rotation (7) et dont la peripherie est pourvue de portées de joint (11).  1 / Crankshaft for a two-cycle two-cycle engine of the type comprising a sealing disc, between the two pump-housings, integral with the connecting rod crank pin, characterized in that it comprises in one assembly - A sealing disc ( 6) provided with weights (13), arranged on the middle of the connecting rod crank pin (5) whose center of gravity (G) is off-axis with respect to the geometric axis of rotation (7) and whose periphery is provided seal surfaces (11). - Un joint à lèvres (8) pincant les portées de joint (11) en vis à vis du flasque d'étanchéité du coté interne et muni, sur sa périphérie externe en regard avec le carter-moteur (12), d'un élastomère (14) complétant l'étanchéité entre les deux carter-pompes (9) (10).- A lip seal (8) pinching the seal surfaces (11) opposite the sealing flange on the internal side and provided, on its external periphery facing the crankcase (12), with an elastomer (14) completing the seal between the two pump-casings (9) (10). 2/ Vilebrequin selon la revendication 1, caractérisé en ce que le centre de gravité (G) du disque et des masselottes est excentré, par rapport à l'axe géométrique de rotation, du coté opposé au maneton afin d' y contrecarrer, sur les moteurs tournant à faible régime de rotation, les efforts d'inertie engendrés par les masses attelées au marie t on  2 / Crankshaft according to claim 1, characterized in that the center of gravity (G) of the disc and the flyweights is eccentric, relative to the geometric axis of rotation, on the side opposite the crankpin in order to counteract it, on the engines running at low rotational speed, the inertia forces generated by the masses coupled to the water 3/ Vilebrequin selon la revendication 1, caractérisé en ce que le centre de gravité (G) du disque et des masselottes est excentré par rapport à l'axe géométrique de rotation, du même coté que le maneton afin d'y contrecarrer, sur les moteurs tournant à haut régime de rotation les efforts de pression. 3 / Crankshaft according to claim 1, characterized in that the center of gravity (G) of the disc and the flyweights is eccentric with respect to the geometric axis of rotation, on the same side as the crankpin in order to counteract it, on the motors running at high speed, the pressure forces. 4/ Vilebrequin selon les revendications 1, 2 et 3, caractérisé en ce que les masselottes (13) occasionnnant l'excentration (E) du centre de gravité (G) sont rapportées sur le disque d'étanchéité (6) afin de rendre possible la rectification du maneton de tète de bielle (5). 4 / Crankshaft according to claims 1, 2 and 3, characterized in that the weights (13) causing the eccentricity (E) of the center of gravity (G) are attached to the sealing disc (6) in order to make it possible the rectification of the crankpin of the connecting rod (5). 5/ Vilebrequin selon la revendication 1 caractérisé en ce que, dans une variante, les lèvres du joint d'étanchéité ne sont pas en contact avec les portées (11) et font office de labirynthe occasionnant une perte de charge importante s'opposant au passage des gaz d'un carter-pompe vers l'autre. 5 / Crankshaft according to claim 1 characterized in that, in a variant, the lips of the seal are not in contact with the bearing surfaces (11) and act as a labirynthe causing a significant pressure drop opposing the passage gases from one pump housing to the other. 6/ Vilebrequin selon la revendication 1, caractérisé en ce que la profondeur de l'évidement entre les lèvres du joint permet son montage par déformation radiale et lattérale du joint afin d'éviter de le sectionner. 6 / Crankshaft according to claim 1, characterized in that the depth of the recess between the lips of the seal allows its assembly by radial and lateral deformation of the seal in order to avoid cutting it. 7/ Vilebrequin selon les revendications 1 et 6, caractérisé en ce que les lèvres du joint sont de faible épaisseur afin de permettre lors de l'accroissement de pression, leur flexion et leur appui sur les portées de joint (11) afin d'augmenter son efficacité et de compenser son usure.  7 / Crankshaft according to claims 1 and 6, characterized in that the lips of the joint are thin in order to allow during the increase in pressure, their bending and their support on the joint surfaces (11) in order to increase its efficiency and compensate for its wear.
FR8801479A 1988-02-04 1988-02-04 RAIDI CRANKSHAFT Expired - Lifetime FR2626943B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8801479A FR2626943B1 (en) 1988-02-04 1988-02-04 RAIDI CRANKSHAFT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8801479A FR2626943B1 (en) 1988-02-04 1988-02-04 RAIDI CRANKSHAFT

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FR2626943A1 true FR2626943A1 (en) 1989-08-11
FR2626943B1 FR2626943B1 (en) 1992-09-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185700A (en) * 2019-04-18 2019-08-30 上海空间推进研究所 Space flight dynamic sealing type crankshaft

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072259A (en) * 1980-02-11 1981-09-30 Brunswick Corp Two-cycle engine with fuel injection
US4598673A (en) * 1985-02-06 1986-07-08 Outboard Marine Corporation Air-scavenged two-cycle internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072259A (en) * 1980-02-11 1981-09-30 Brunswick Corp Two-cycle engine with fuel injection
US4598673A (en) * 1985-02-06 1986-07-08 Outboard Marine Corporation Air-scavenged two-cycle internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185700A (en) * 2019-04-18 2019-08-30 上海空间推进研究所 Space flight dynamic sealing type crankshaft

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Publication number Publication date
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