FR2669689A1 - Connecting rod without small end bushing and method for producing it - Google Patents

Connecting rod without small end bushing and method for producing it Download PDF

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Publication number
FR2669689A1
FR2669689A1 FR9014609A FR9014609A FR2669689A1 FR 2669689 A1 FR2669689 A1 FR 2669689A1 FR 9014609 A FR9014609 A FR 9014609A FR 9014609 A FR9014609 A FR 9014609A FR 2669689 A1 FR2669689 A1 FR 2669689A1
Authority
FR
France
Prior art keywords
connecting rod
deposit
small end
producing
bore
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.)
Granted
Application number
FR9014609A
Other languages
French (fr)
Other versions
FR2669689B1 (en
Inventor
Desplanches Gerard
Cuny Gerard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to FR9014609A priority Critical patent/FR2669689B1/en
Publication of FR2669689A1 publication Critical patent/FR2669689A1/en
Application granted granted Critical
Publication of FR2669689B1 publication Critical patent/FR2669689B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Connecting rod which does not have a bearing bush on the small end, characterised in that it exhibits, on the base metal of the small end bore, a deposit having good friction and wear-resistance properties.

Description

BIELlIE SANS COUSSIT DEPIED ET PROCèDE DE REALTSATION
La présente invention se rapporte à une bielle en acier dépourvue de coussinet sur le pied de bielle et à son procédé de réalisation.BIELlIE WITHOUT COUSSIT DEPIED AND REALTSATION PROCESS
The present invention relates to a steel connecting rod devoid of bearing on the connecting rod foot and to its production method.

L'axe de piston est monté libre dans le pied de bielle et en fonctionnement, tourillonne aussi bien dans le pied de bielle que dans les bossages d'axe du piston.The piston pin is mounted free in the big end and in operation, journalled both in the big end as in the piston pin bosses.

I1 a déjà été proposé de réaliser une bielle tourillonnant directement à son pied sur l'axe du piston, sans interposition de coussinet ou métal antifriction. I1 has already been proposed to produce a connecting rod journalling directly at its foot on the axis of the piston, without interposition of bearing or anti-friction metal.

Ce type de montage s'adresse à des moteurs particulièrement chargés.This type of assembly is intended for particularly loaded motors.

Habituellement le pied de bielle est pourvu d'un coussinet.Usually the big end is provided with a bearing.

Le coussinet (ou bague) est monté fretté dans le pied et y génère des contraintes de tension. Le dimensionnement du pied résulte de la prise en compte des contraintes superposées de tension et de service. I1 existe des exemples pour lesquels la part de contraintes prise par le frettage de bague sur les contraintes mécaniques globales de pied est supérieure aux contraintes induites par le fonctionnement de la bielle.The bearing (or ring) is mounted hooped in the foot and generates tension stresses there. The sizing of the foot results from taking into account the superimposed constraints of tension and service. There are examples for which the share of stresses taken up by the ring hooping on the overall mechanical stresses of the foot is greater than the stresses induced by the operation of the connecting rod.

La présente invention a pour but de supprimer les contraintes de frettage de la bague. En conséquence on réduit le poids de la bielle et l'encombrement au niveau du pied grâce à la suppression de la bague habituelle.The present invention aims to remove the hoop stresses from the ring. Consequently, the weight of the connecting rod and the space at the foot are reduced by eliminating the usual ring.

La suppression de la bague de pied de bielle et son
remplacement par des solutions qui assurent la fonction
anti-friction mais qui ne génèrent pas (ou très peu) de
contraintes internes de tension dans le pied lors de leur mise en oeuvre, permet donc d'envisager un dimensionnement réduit du pied et un gain sur la masse totale de la bielle.Cet avantage est d'autant plus important que ces solutions s'adressent à des bielles de moteurs chargés et rapides pour lesquels l'aspect réduction d'inertie de l'attelage mobile est primordial pour l'augmentation des performances moteur.The removal of the big end ring and its
replacement with solutions that provide the function
anti-friction but which do not generate (or very little)
internal tension constraints in the foot during their implementation, therefore makes it possible to envisage a reduced dimensioning of the foot and a gain on the total mass of the connecting rod. This advantage is all the more important as these solutions are intended for loaded and fast engine connecting rods for which the reduction of inertia aspect of the movable coupling is essential for the increase of engine performance.

Conformément à l'invention, la bielle est caractérisée par le fait qu'elle présente sur le métal de base de l'alésage du pied de bielle, un dépôt ayant de bonnes propriétés de frottement et de résistance à l'usure.According to the invention, the connecting rod is characterized in that it has on the base metal of the bore of the connecting rod, a deposit having good friction and wear resistance properties.

Le procédé de réalisation de cette bielle est caractérisé par le fait qu'il consiste à durcir par trempe l'alésage de la bielle avant de réaliser le dépôt.The process for producing this connecting rod is characterized in that it consists in hardening the bore of the connecting rod by quenching before depositing it.

D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante qui fait réference aux dessins annexés sur lesquels: - La figure 1 est une vue partielle d'un pied de bielle pourvu d'un revêtement selon l'invention.Other characteristics and advantages of the invention will emerge from the following description which refers to the accompanying drawings in which: - Figure 1 is a partial view of a connecting rod foot provided with a coating according to the invention.

- La figure 2 est une vue en coupe d'un premier type de dépôt appliqué sur l'alésage du pied de bielle.- Figure 2 is a sectional view of a first type of deposit applied to the bore of the connecting rod.

- La figure 3 est une vue en coupe d'un autre type de dépôt appliqué sur l'alésage du pied de bielle.- Figure 3 is a sectional view of another type of deposit applied to the bore of the connecting rod.

La bielle selon l'invention est réalisée en acier. Elle présente dans l'alèsage de pied de bielle 1 un dépôt anti-friction 2, ne générant pas de contraintes de tension dans le métal de base. The connecting rod according to the invention is made of steel. It has in the big end bore 1 an anti-friction deposit 2, not generating tension stresses in the base metal.

Ce dépôt est constitué, par une couche lubrifiante et antigrippante de sulfures de fer obtenue par voie thermochimique (à basse température) ou de nickel chimique obtenue par voie électrochimique ou de carbone dur obtenue par procédé de dépôt en phase vapeur. L'alésage de pied de bielle, peut être préalablement durci par trempe par induc.tion. Ces solutions peuvent être utilisées face à un axe de piston en acier de type utilisé en série, ou préalablement traité par les techniques évoquées précédemment. This deposit consists of a lubricating and anti-seize layer of iron sulphides obtained thermochemically (at low temperature) or chemical nickel obtained electrochemically or hard carbon obtained by vapor deposition process. The big end bore can be hardened beforehand by induction hardening. These solutions can be used in front of a steel piston pin of the type used in series, or previously treated by the techniques mentioned above.

La figure 1 montre un dépôt de carbone dur. L'épaisseur du dépôt de carbone (figure 1) est de 1 à 10 microns.Figure 1 shows a deposition of hard carbon. The thickness of the carbon deposit (Figure 1) is 1 to 10 microns.

La figure 2 montre un dépôt de nickel chimique durci.Figure 2 shows a deposit of hardened chemical nickel.

L'épaisseur du dépôt de nickel chimique (figure 2) est de 5 à 50 microns. The thickness of the chemical nickel deposit (Figure 2) is 5 to 50 microns.

Claims (4)

REVENDICATIONS 1 Bielle dépourvue de coussinet sur le pied de bielle,1 connecting rod without bearing on the big end, caractérisée par le fait qu'elle présente, sur le characterized by the fact that it presents, on the métal de base de l'alèsage du pied de bielle, un dépôt base metal of the big end bore, a deposit ayant de bonnes propriétés de frottement et de having good friction and résistance à l'usure. wear resistance. 2 Bielle selon la revendication 1, caractérisée par le2 connecting rod according to claim 1, characterized by fait que le dépôt est un dépôt de carbone dur. makes the deposit a hard carbon deposit. 3 Bielle selon la revendication 1, caractérisée par le3 connecting rod according to claim 1, characterized by fait que le dépôt est un dépôt de nickel chimique. makes the deposit a deposit of chemical nickel. l'alésage de la bielle avant de réaliser le dépôt.  the bore of the connecting rod before depositing. par le fait qu'il consiste à durcir par trempe by the fact that it consists of hardening by quenching quelconque des revendications précédentes caractérisé any of the preceding claims characterized [4] Procédé de réalisation d'une bielle selon l'une[4] Method for producing a connecting rod according to one
FR9014609A 1990-11-23 1990-11-23 CONNECTING ROD WITHOUT FOOT PAD AND METHOD FOR PRODUCING THE SAME. Expired - Fee Related FR2669689B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9014609A FR2669689B1 (en) 1990-11-23 1990-11-23 CONNECTING ROD WITHOUT FOOT PAD AND METHOD FOR PRODUCING THE SAME.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9014609A FR2669689B1 (en) 1990-11-23 1990-11-23 CONNECTING ROD WITHOUT FOOT PAD AND METHOD FOR PRODUCING THE SAME.

Publications (2)

Publication Number Publication Date
FR2669689A1 true FR2669689A1 (en) 1992-05-29
FR2669689B1 FR2669689B1 (en) 1994-12-30

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Family Applications (1)

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FR9014609A Expired - Fee Related FR2669689B1 (en) 1990-11-23 1990-11-23 CONNECTING ROD WITHOUT FOOT PAD AND METHOD FOR PRODUCING THE SAME.

Country Status (1)

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FR (1) FR2669689B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1507088A1 (en) * 2003-08-13 2005-02-16 Nissan Motor Company, Limited Structure for connecting piston to crankshaft
US7650976B2 (en) 2003-08-22 2010-01-26 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor
US8206035B2 (en) 2003-08-06 2012-06-26 Nissan Motor Co., Ltd. Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US8575076B2 (en) 2003-08-08 2013-11-05 Nissan Motor Co., Ltd. Sliding member and production process thereof

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3555844B2 (en) 1999-04-09 2004-08-18 三宅 正二郎 Sliding member and manufacturing method thereof
US6969198B2 (en) 2002-11-06 2005-11-29 Nissan Motor Co., Ltd. Low-friction sliding mechanism
JP4863152B2 (en) 2003-07-31 2012-01-25 日産自動車株式会社 gear
US7771821B2 (en) 2003-08-21 2010-08-10 Nissan Motor Co., Ltd. Low-friction sliding member and low-friction sliding mechanism using same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60231010A (en) * 1984-05-02 1985-11-16 Toyota Motor Corp Connecting rod
JPS61244914A (en) * 1985-04-23 1986-10-31 Toshiba Corp Connecting rod

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60231010A (en) * 1984-05-02 1985-11-16 Toyota Motor Corp Connecting rod
JPS61244914A (en) * 1985-04-23 1986-10-31 Toshiba Corp Connecting rod

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 92 (M-468)[2149] 9 avril 1986; & JP-A-60 231 010 (TOYOTA) 16-11-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 94 (M-574)[2541], 25 mars 1987; & JP-A-61 244 914 (TOSHIBA) 31-10-1986 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8206035B2 (en) 2003-08-06 2012-06-26 Nissan Motor Co., Ltd. Low-friction sliding mechanism, low-friction agent composition and method of friction reduction
US8575076B2 (en) 2003-08-08 2013-11-05 Nissan Motor Co., Ltd. Sliding member and production process thereof
EP1507088A1 (en) * 2003-08-13 2005-02-16 Nissan Motor Company, Limited Structure for connecting piston to crankshaft
US7650976B2 (en) 2003-08-22 2010-01-26 Nissan Motor Co., Ltd. Low-friction sliding member in transmission, and transmission oil therefor

Also Published As

Publication number Publication date
FR2669689B1 (en) 1994-12-30

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