FR2732071A1 - Connecting rod end bearing in cam-type IC engine - Google Patents

Connecting rod end bearing in cam-type IC engine Download PDF

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Publication number
FR2732071A1
FR2732071A1 FR9503645A FR9503645A FR2732071A1 FR 2732071 A1 FR2732071 A1 FR 2732071A1 FR 9503645 A FR9503645 A FR 9503645A FR 9503645 A FR9503645 A FR 9503645A FR 2732071 A1 FR2732071 A1 FR 2732071A1
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France
Prior art keywords
circle
cam
portions
dead centers
same radius
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Granted
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FR9503645A
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French (fr)
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FR2732071B1 (en
Inventor
Andre Chaneac
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Const Et D Innovations SA Atel
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Const Et D Innovations SA Atel
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
    • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
    • F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces

Abstract

The bearing (3) contacts the surface of a cam (5) and is mounted rotatably about an axis (4) at the free end of the piston rod (2) of the engine. The cam is shaped to define a pair of convex arcs (6,7) around its top dead centre points (8,9). The central part of the contact surface of the bearing is formed as a concave arc of the same radius as these arcs. The bottom dead centre points (12,13) of the cam are formed as concave circular arcs of the same radius as the convex arcs. The outer edges (16,17) of the contact surface of the bearing are convex in profile, with the same radius as the concave surfaces of the cam.

Description

La présente invention concerne le profil d'un patin transmettant la poussée d'un piston sur une came dans le cas d'un moteur thermique à cames.The present invention relates to the profile of a pad transmitting the thrust of a piston on a cam in the case of a cam combustion engine.

ll existe un certain nombre de brevets ou les cames comportent des portions de cercles situées de part et d'autre des points morts hauts et bas, par exemple les brevets 1904680, 3735741, 4545336, mais les patins qui transmettent la poussée du piston sont des galets, des roulements. Or compte tenu des pressions très élevées obtenues dans le cylindre, les charges sont très importantes et les pressions de Hertz sont très fortes, ce qui entraîne des usures et des grippages. There are a number of patents where the cams have portions of circles located on either side of the top and bottom dead centers, for example the patents 1904680, 3735741, 4545336, but the pads which transmit the piston thrust are rollers, bearings. However, given the very high pressures obtained in the cylinder, the loads are very high and the Hertz pressures are very high, which causes wear and seizures.

La présente invention a pour but de remédier à ces inconvénients en augmentant la surface de contact entre came et patin afin de diminuer les pressions de Hertz, de tavoriser le graissage, et de baisser le coefficient de frottement de la transmission.The object of the present invention is to remedy these drawbacks by increasing the contact surface between cam and shoe in order to reduce the Hertz pressures, promote lubrication, and lower the friction coefficient of the transmission.

Suivant une caractéristique de l'invention, dans le cas ou la came comporte des portions de cercle situées de part et d'autre des points morts hauts, le profil du patin comporte une portion de cercle de même rayon et de même sens que celui de la came.According to a characteristic of the invention, in the case where the cam comprises portions of a circle situated on either side of the top dead centers, the profile of the shoe comprises a portion of a circle of the same radius and in the same direction as that of drug.

Suivant une autre caractéristique de l'invention, dans le cas ou la came est un cercle excentré, le patin est formé d'une portion de cercle de même rayon et de même sens que le cercle excentré de la came.According to another characteristic of the invention, in the case where the cam is an eccentric circle, the shoe is formed by a portion of a circle of the same radius and in the same direction as the eccentric circle of the cam.

Suivant une autre caractéristique de l'invention, dans le cas ou la came comporte des portions de cercles différents au points morts hauts et bas, le patin est formé par une portion de cercle, de même rayon que les portions de cercle des points morts hauts, située entre deux portions de cercle de même rayon que les portions de cercle des points morts bas et de même sens.According to another characteristic of the invention, in the case where the cam comprises portions of circles different from the top and bottom dead centers, the shoe is formed by a portion of a circle, of the same radius as the circle portions of the top dead centers , located between two circle portions of the same radius as the circle portions of the bottom dead centers and of the same direction.

Suivant une autre caractéristique de l'invention, dans le cas ou la came comporte deux chemins d'appui, un pour les points morts hauts et un autre pour les points morts bas, formés par des portions de cercle différents aux points morts hauts et bas, le patin est formé par une portion de cercle de même rayon que les portions de cercle des points morts hauts, située entre deux portions de cercle de même rayon que les portions de cercle des points morts bas et de même sens.According to another characteristic of the invention, in the case where the cam has two support paths, one for the top dead centers and another for the bottom dead centers, formed by portions of a circle different from the top and bottom dead centers , the skate is formed by a portion of a circle with the same radius as the circle portions of the top dead centers, located between two portions of a circle with the same radius as the circle portions of the bottom dead centers and with the same direction.

La présente invention définit un patin associé à une came, mais le moteur peut comporter deux ou trois cames, dans ce cas la poussée du piston sera transmise par deux ou trois patins pivotant autour d'un axe solidaire de la tige du piston, chaque patin ayant les mêmes caractéristiques.The present invention defines a pad associated with a cam, but the engine may comprise two or three cams, in this case the thrust of the piston will be transmitted by two or three pads pivoting around an axis integral with the piston rod, each pad having the same characteristics.

L'invention et ses avantages ressortiront mieux de la description qui suit et des exemples de réalisation donnés à titre indicatif mais non limitatif et qui sont illustrés par les figures suivantes dans lesquelles: - la figure 1 est une vue en plan perpendiculaire à l'arbre moteur d'un piston et de son patin ainsi que de la forme d'une came.The invention and its advantages will emerge more clearly from the description which follows and from the exemplary embodiments given by way of indication but not limitation and which are illustrated by the following figures in which: - Figure 1 is a plan view perpendicular to the shaft engine of a piston and its shoe as well as the shape of a cam.

- la figure 2 est une vue en plan perpendiculaire à l'arbre moteur d'un piston et de son patin ainsi que de la forme d'une came formée par un cercle excentré.- Figure 2 is a plan view perpendicular to the drive shaft of a piston and its shoe as well as the shape of a cam formed by an eccentric circle.

- la figure 3 est une vue en plan perpendiculaire à l'arbre moteur d'un patin comprenant une portion de cercle de même rayon que les portions de cercle situées de part et d'autre des points morts hauts, située entre deux portions de cercle de même rayon que les portions de cercle situées de part et d'autre des points morts bas.- Figure 3 is a plan view perpendicular to the drive shaft of a shoe comprising a circle portion of the same radius as the circle portions located on either side of the top dead centers, located between two circle portions with the same radius as the portions of the circle located on either side of the bottom dead centers.

- la figure 4 est une vue en plan perpendiculaire à l'arbre moteur d'un patin comportant trois surfaces de contact, une centrale formée par une portion de cercle de même rayon que les portions de cercle des points morts hauts, et deux latérales formées chacune par une portion de cercle de même rayon que les portions de cercle des points morts bas et de même sens, dans le cas où la came 5 comporte deux chemins d'appui du patin.- Figure 4 is a plan view perpendicular to the motor shaft of a shoe having three contact surfaces, a central formed by a circle portion of the same radius as the circle portions of the top dead centers, and two lateral formed each by a circle portion of the same radius as the circle portions of the bottom dead centers and in the same direction, in the case where the cam 5 has two support paths of the pad.

- la figure 5 est une vue en coupe verticale d'un patin montrant les trois chemins d'appui du patin.- Figure 5 is a vertical sectional view of a shoe showing the three support paths of the shoe.

- la figure 6 est une vue en projection d'une came montrant les trois chemins d'appui du patin.- Figure 6 is a projection view of a cam showing the three support paths of the pad.

La figure 1 est une vue en plan perpendiculaire à l'arbre moteur 14 d'un piston 1, de son patin 3 et de la came 5. Le piston I transmet toute la poussée, par une tige 2 s'appuyant par son patin 3, pivotant autour d'un axe 4 solidaire de la tige 2, sur une came 5, formée par des portions de cercle 6 et 7 situées de part et d'autre des points morts hauts 8 et 9 et par des portions de cercle 10 et 11 situées de part et d'autre des points morts bas 12 et 13, la came S étant solidaire de l'arbre moteur 14. Le patin 3 comporte une portion de cercle 15 de même rayon et de même sens que les portions de cercle 6 et 7, de façon à s'appuyer sur la came par toute sa surface autour des points morts hauts. ll comporte d'autre part deux portions de cercle 16 et 17 de même rayon et de même sens que les portions de cercle 10 et 11.Figure 1 is a plan view perpendicular to the drive shaft 14 of a piston 1, its shoe 3 and the cam 5. The piston I transmits all the thrust, by a rod 2 supported by its shoe 3 , pivoting about an axis 4 integral with the rod 2, on a cam 5, formed by portions of a circle 6 and 7 located on either side of the top dead centers 8 and 9 and by portions of a circle 10 and 11 located on either side of the bottom dead centers 12 and 13, the cam S being integral with the motor shaft 14. The shoe 3 has a portion of a circle 15 of the same radius and in the same direction as the portions of the circle 6 and 7, so as to rest on the cam by its entire surface around the top dead centers. It also has two circle portions 16 and 17 with the same radius and the same direction as the circle portions 10 and 11.

La figure 2 est une vue en plan perpendiculaire à l'arbre moteur 14 lorsque la came 5 est un cercle excentré 18. Nous retrouvons les mêmes caractéristiques que la figure 1. La seule différence est que le patin 3 ne comporte quine seule portion de cercle 15 de même rayon et de même sens que le cercle excentré 18.Figure 2 is a plan view perpendicular to the drive shaft 14 when the cam 5 is an eccentric circle 18. We find the same characteristics as in Figure 1. The only difference is that the shoe 3 has only one portion of a circle 15 of the same radius and the same direction as the eccentric circle 18.

La figure 3 est une vue en plan perpendiculaire à l'arbre moteur 14 d'un patin 3 pivotant autour de l'axe 4 solidaire de la tige 2. Nous retrouvons les mêmes caractéristiques que précédemment; le patin 3 comporte une portion de cercle 15 de même rayon que les portions de cercle 6 et 7 des points morts hauts 8 et 9, comprise entre deux portions de cercle 16 et 17 de même rayon que les portions de cercle 10 et 11 des points morts bas 12 et 13. Figure 3 is a plan view perpendicular to the drive shaft 14 of a shoe 3 pivoting about the axis 4 secured to the rod 2. We find the same characteristics as above; the shoe 3 has a portion of a circle 15 of the same radius as the portions of circle 6 and 7 of the top dead centers 8 and 9, between two portions of circle 16 and 17 of the same radius as the portions of circle 10 and 11 of the points dead low 12 and 13.

La figure 4 et la figure 5 sont deux vues, l'une en plan perpendiculaire à l'arbre moteur et rautre en plan parallèle à l'arbre moteur, d'un patin 3 pivotant autour de l'axe 4 solidaire de la tige 2 ou de son support 22, comportant trois surfaces de contact; la première étant une portion de cercle 15 de même rayon que les portions de cercles 6 et 7 des points morts hauts 8 et 9, les deux autres 16 et 17 étant situées de part et d'autre de la surface de cercle 15 et ayant le même rayon que les portions de cercle 10 et 11 des points morts bas 12 et 13. Le patin 3 comporte donc trois chemins d'appui: un central 15, et deux latéraux 16 et 17 de part et d'autre de 15.Figure 4 and Figure 5 are two views, one in plan perpendicular to the drive shaft and another in plan parallel to the drive shaft, of a shoe 3 pivoting about the axis 4 secured to the rod 2 or its support 22, comprising three contact surfaces; the first being a portion of a circle 15 of the same radius as the portions of circles 6 and 7 of the top dead centers 8 and 9, the other two 16 and 17 being located on either side of the surface of circle 15 and having the same radius as the circle portions 10 and 11 of the bottom dead centers 12 and 13. The shoe 3 therefore has three support paths: a central 15, and two lateral 16 and 17 on either side of 15.

La figure 6 est une vue en projection d'une came 5 où l'on voit les trois chemins d'appui discontinus 19 pour la partie centrale 15 du patin 3 comprise entre les deux chemins discontinus 20 et 21. Le chemin d'appui 19 est en contact avec la portion de cercle 15, les chemins d'appui 20 et 21 le sont avec les portions 17 et 16.Figure 6 is a projection view of a cam 5 where we see the three discontinuous support paths 19 for the central part 15 of the shoe 3 between the two discontinuous paths 20 and 21. The support path 19 is in contact with the circle portion 15, the support tracks 20 and 21 are with the portions 17 and 16.

Bien entendu, si le moteur à cames comporte deux ou trois cames pouvant tourner en sens inverse, la tige 2 du piston s'appuie obligatoirement sur un support 22 comportant autant de patins 3 que de nombre de cames 5.Of course, if the cam engine comprises two or three cams which can rotate in opposite directions, the piston rod 2 is necessarily supported on a support 22 comprising as many pads 3 as the number of cams 5.

D'autres formes de patins pourraient être trouvées sans pour cela sortir du cadre de l'invention dont le seul but est de diminuer les pressions de contact entre les patins et les cames dans le cas d'un moteur thermique à cames.Other forms of pads could be found without departing from the scope of the invention, the sole purpose of which is to reduce the contact pressures between the pads and the cams in the case of a cam engine.

Par ailleurs, nous avons pris comme exemple une came 5 à deux bossages, on pourrait prendre plusieurs bossages pour d'autres cames sans pour cela sortir du cadre de l'invention. Furthermore, we have taken as an example a cam 5 with two bosses, we could take several bosses for other cams without departing from the scope of the invention.

Claims (4)

REVENDICATIONS 1) Profil d'un patin 3 s'appuyant sur une came 5 et pivotant autour d'un axe central 4 fixé soit à la tige 2 du piston 1, soit sur un support 22 de cette tige 2 comportant un ou deux ou trois patins suivant le nombre de cames du moteur thermique, la ou les cames possédant une portion de cercle 6 et 7 de chaque côté des points morts hauts 8 et 9, caractérisé en ce que le profil du patin 3 comporte une portion de cercle 15 de même rayon et de même sens que celui de la came, de façon à s'appuyer sur la came par toute sa surface autour des points morts hauts.1) Profile of a pad 3 resting on a cam 5 and pivoting about a central axis 4 fixed either to the rod 2 of the piston 1, or on a support 22 of this rod 2 comprising one or two or three pads depending on the number of cams of the heat engine, the cam or cams having a circle portion 6 and 7 on each side of the top dead centers 8 and 9, characterized in that the profile of the pad 3 comprises a circle portion 15 of the same radius and in the same direction as that of the cam, so as to rest on the cam by its entire surface around the top dead centers. 2) Profil d'un patin suivant la première revendication dans le cas où le moteur thermique comporte une ou plusieurs cames 5 réalisées par un cercle excentré 18, caractérisé en ce que le profil du patin 3 est une portion de cercle 15 de même rayon et de même sens.2) Profile of a shoe according to the first claim in the case where the heat engine comprises one or more cams 5 produced by an eccentric circle 18, characterized in that the profile of the shoe 3 is a portion of a circle 15 of the same radius and in the same sense. 3) Profil d'un patin suivant la première revendication dans le cas où le moteur thermique comprend une ou plusieurs cames 5 comportant des portions de cercle 6 et 7 situées de part et d'autre des points morts hauts 8 et 9, et par d'autres portions de cercle 10 et 11 situées de part et d'autre des points morts bas 12 et 13, caractérisé en ce que le profil du patin 3 comporte une portion de cercle 15 de même rayon que les portions de cercle 6 et 7 des points morts hauts 8 et 9, et deux portions de cercle 16 et 17 de même rayon que les portions de cercle 10 et 1 1 des points morts bas 12 et 13, situées de part et d'autre de la portion de cercle 15.3) Profile of a skate according to the first claim in the case where the heat engine comprises one or more cams 5 comprising portions of a circle 6 and 7 located on either side of the top dead centers 8 and 9, and by d '' other circle portions 10 and 11 located on either side of the bottom dead centers 12 and 13, characterized in that the profile of the shoe 3 comprises a circle portion 15 of the same radius as the circle portions 6 and 7 of the top dead centers 8 and 9, and two circle portions 16 and 17 of the same radius as the circle portions 10 and 11 of the bottom dead centers 12 and 13, located on either side of the circle portion 15. 4) Profil d'un patin 3 suivant la première revendication dans le cas où la came 5 comporte des portions de cercle discontinues 19 situées de part et d'autre des points morts hauts 8 et 9, et deux portions de cercle 21 et 22 discontinues situées de chaque côté des portions de cercle 19 et 20, caractérisé en ce que le profil du patin 3 comporte une portion de cercle 15 de même rayon que les portions de cercle 6 et 7 situées de part et d'autre des points morts hauts 8 et 9, cette portion de cercle 15 étant placée entre deux portions de cercle latérales 16 et 17 de même rayon que les portions de cercle 10 et 1 1 situées de part et d'autre des points morts bas 12 et 13. 4) Profile of a Skid 3 according to the first claim in the case where the cam 5 comprises discontinuous circle portions 19 located on either side of the top dead centers 8 and 9, and two discontinuous circle portions 21 and 22 located on each side of the circle portions 19 and 20, characterized in that the profile of the shoe 3 comprises a circle portion 15 of the same radius as the circle portions 6 and 7 located on either side of the top dead centers 8 and 9, this circle portion 15 being placed between two lateral circle portions 16 and 17 with the same radius as the circle portions 10 and 11 located on either side of the bottom dead centers 12 and 13.
FR9503645A 1995-03-23 1995-03-23 PROFILE OF A SKATE BASED ON ONE OR MORE CAMS Expired - Fee Related FR2732071B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005088102A1 (en) * 2004-03-17 2005-09-22 Mission Foundation Of The Family Federation For World Peace And Unification Track determining method for cam of cam-type engine and hump track part, and cam whose track is determined by said method and cam-type engine having hump track part

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677101A (en) * 1949-06-18 1952-08-06 Eduard Woydt Radial-cylinder pumps and motors
FR2182485A5 (en) * 1972-04-22 1973-12-07 Dubno Abraham
FR2651829A1 (en) * 1989-09-08 1991-03-15 Innovations Atel Const Combustion engine without connecting rods or crankshaft, of the type having cylinders in a star configuration
GB2278883A (en) * 1993-05-06 1994-12-14 Stephen William Owen Cam drive reciprocating piston engine.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677101A (en) * 1949-06-18 1952-08-06 Eduard Woydt Radial-cylinder pumps and motors
FR2182485A5 (en) * 1972-04-22 1973-12-07 Dubno Abraham
FR2651829A1 (en) * 1989-09-08 1991-03-15 Innovations Atel Const Combustion engine without connecting rods or crankshaft, of the type having cylinders in a star configuration
GB2278883A (en) * 1993-05-06 1994-12-14 Stephen William Owen Cam drive reciprocating piston engine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005088102A1 (en) * 2004-03-17 2005-09-22 Mission Foundation Of The Family Federation For World Peace And Unification Track determining method for cam of cam-type engine and hump track part, and cam whose track is determined by said method and cam-type engine having hump track part

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Publication number Publication date
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