EP3638923A1 - Procédé d'assemblage de guides de chaine de distribution de moteur et système de guidage d'une chaine de distribution - Google Patents
Procédé d'assemblage de guides de chaine de distribution de moteur et système de guidage d'une chaine de distributionInfo
- Publication number
- EP3638923A1 EP3638923A1 EP18728686.9A EP18728686A EP3638923A1 EP 3638923 A1 EP3638923 A1 EP 3638923A1 EP 18728686 A EP18728686 A EP 18728686A EP 3638923 A1 EP3638923 A1 EP 3638923A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide
- housing
- chain
- fixed guide
- movable guide
- 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.)
- Withdrawn
Links
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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/18—Means for guiding or supporting belts, ropes, or chains
-
- 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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/0812—Fluid pressure
-
- 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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0872—Sliding members
-
- 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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0893—Circular path
-
- 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
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0897—External to internal direction
Definitions
- the invention relates to a method for assembling internal combustion engine timing chain guides. It also relates to a guide system of an internal combustion engine distribution chain for driving camshaft pinions, comprising a distribution chain and two chain guides assembled according to the method.
- the timing chain In an internal combustion engine of a motor vehicle, the timing chain is wound around pinions mounted at the end of the crankshaft and camshafts. It thus carries out the drive of the camshafts - in general, a motor is equipped with a double camshaft - from the crankshaft rotated by the cylinders of the engine. This timing chain then allows the crankshaft and camshafts to synchronize the opening and closing control of the cylinders by the valves mounted on the camshafts.
- the timing chain is supported by guides, usually two guides between the crankshaft and each camshaft gear, because the axes of these gears are distant, and oscillate the chain strands, stretched and soft.
- the guides eliminate radial and lateral deflections to ensure alignment and avoid torsional stresses.
- a gear drive system of an internal combustion engine is described more precisely below with reference to the side view of FIG. 1.
- This system 1 comprises a timing chain 2 wound continuously around the pinions 3a, 3b and 3c: the pinions 3a and 3b mounted at the end of the camshafts 9a and 9b, and the pinion 3c of the crankshaft 9c.
- the system 1 also comprises the two tension maintenance guides of the chain 2: a fixed guide 4 and a movable guide 5.
- the fixed guide 4 is attached by two screws 6 to a wall rear, usually of the crankcase.
- a pinion-tensioner 8 ensures a predetermined constant tension of the timing chain 2 by action on the movable guide 5 which tends the chain 2 by pivoting about the axis of the screw.
- the drive system 1 is small in size thanks to the fixing of the two guides to one another by means of the screw 7.
- this system must ensure by means of the single screw 7 the fixing of the guide 4 and the pivoting of the guide 5.
- the system has several major drawbacks: the screw 7 to ensure pivoting and fixing, the movable guide 5 is not effectively held and it may move along the screw 7, which affects the alignment of the two guides 4 and 5 in the same plane. Fixing on the axis by crimping, welding or hooping processes requires the addition of additional mechanical parts and additional manipulations. The realization of this system is therefore complex with tolerances difficult to control, while the system is maintained on the cylinder block only by the screws 6 of the fixed guide 4. It follows premature aging and lower performance in recovery engine forces.
- the movable plastic guide of a drive system is associated with a reinforcing plate.
- the movable guide and the reinforcing plate respectively comprise mounting holes and opening coincided on a mounting axis, the movable guide pivoting about the mounting axis.
- the reinforcing plate is housed in a slot formed in a shoe of the guide body and has a substantially constant contact area with the piston of a tensioner. This solution absorbs noise, resists abrasion and reduces the effects of long-term abrasion.
- no connection between the movable guide of plastic material and a fixed metal guide is described, the plate exerting only a reinforcing function and not a fixed guide.
- WO20121 15126 a chain drive system comprising two guides, a guide attached to the motor and the other guide fixed on one side to an axis of rotation and on the other side to a pressing device against the chain.
- This device has a reduction in abrasion provided by bearings whose axes of rotation are arranged without friction in the inner walls of the guides.
- No improvement in linkage between the guides is disclosed for a drive system having to take up a small space in an engine with a limited number of mounting steps.
- the invention provides for separating the fixing function of the fixed guide of the pivoting function of the movable guide by a non-return lock.
- the subject of the present invention is a method for assembling longitudinal guides of an internal combustion engine distribution chain, a so-called fixed guide and a so-called mobile guide for maintaining the tension chain extending in parallel. at a transverse plane and along two opposite chain portions.
- a step of connecting the guides an extension of the fixed guide extending laterally relative to the longitudinal direction of this guide is inserted into a housing extending parallel to the transverse plane.
- This connection step ends with a non-return lock of the fixed guide by clipping a portion of said extension against a border of said housing.
- a step of fixing the fixed guide and mounting the movable guide in rotation between two stops is performed around the same axis.
- the assembly of fixed and movable guides according to the invention does not require additional components such as a socket, solder or crimping, and the assembly function of the two guides is integrated on each of the guides.
- the insertion of the extension of the fixed guide into the housing of the movable guide is achieved by elastic deformation of the housing of the movable guide under the pressure exerted by the extension portion, an end of this extension portion. then coming against said housing edge in the anti-return blocking step.
- the insertion step is performed by elastic deformation of the extension portion in a groove formed in the inner wall of the housing under the pressure exerted by the outer wall of the housing, an end of this portion of extension then bearing against said edge of the light of the outer wall of the housing in the non-return locking step.
- the non-return lock of the fixed metal guide is formed by an open slot extending laterally in the movable guide and by elastic deformation during the passage of the extension of the fixed guide by a narrowing made at the end of this slot.
- the extension being terminated by a rounded head connected to a first section of the extension by a narrower neck
- the non-return locking of the fixed guide is made by two clips housing at locking in the neck between the head and the first section, and by guiding the head under a cleat arranged on a wall of the housing.
- the invention also relates to a guiding system of an internal combustion engine distribution chain having two facing chain portion guides, a fixed guide and a movable guide for maintaining the chain in tension. extending longitudinally and parallel to a transverse plane, and a cylinder block.
- the fixed guide is immobilized on the cylinder block via a pivot and the movable guide is mounted movably on the same pivot.
- the fixed guide has a non-return arm extending laterally relative to the longitudinal direction of this guide and positioned by an access slot in a housing formed on the movable guide by two walls extending parallel to the transverse plane and connected by two sides forming lateral stops, the slot having a height greater than the width of the arm.
- the non-return arm is held in the housing by a tongue coming from the non-return arm and supported at the end on a light edge formed in one of the walls of the housing.
- the tongue has an end zone raised relative to the remainder of the tongue, this end zone being in abutment against the border of said light so as to exert a non-return function;
- the raised end zone results from a tongue structure chosen between an increase in thickness of the tongue, a tongue profile having a "step" offset and a boss formed at the tongue end;
- the abutments form an angular sector flanking the antiretour arm and the edge of the light on which bears the tongue end zone is curved; the advantage is to allow a pivoting movement of the movable guide relative to the fixed guide between abutments in contact all along the non-return arm;
- the fixed guide is produced by stamping and cutting from a parent matrix material selected from sheet metal, aluminum and steel;
- the mobile guide is made of plastic material produced by injection into a mold
- the pivot comprising a head, a threaded nose and a central body connecting the head to the nose, the central body of diameter greater than that of the nose crossing without contact a bore of the movable guide and clamping against the fixed guide around a orifice through which the nose screwed into the cylinder block; thus, the bore and the orifice jointly enable a pivot of the movable guide which attaches to the cylinder block without any intermediate part, nor any additional operation (crimping, hooping, gluing, welding or equivalent).
- the invention also relates to a pre-assembled internal combustion engine timing chain drive cassette to facilitate the mounting of this drive in the chain well.
- a cassette comprises a guiding system of the type defined above, with the distribution chain wound continuously around the two camshaft gears and the crankshaft pinion of the engine.
- the fixed guide is mounted on a fixing slide and is configured to serve as a carrier frame of the chain and sprockets.
- the invention also relates to a motor vehicle equipped with a drive system for an internal combustion engine as defined above.
- FIGS. 2a and 2b partial front views of a fixed guide (FIG. 2a) and the non-return arm of this guide (FIG. 2b) of an example of a fixed drive system guide arm according to FIG. invention;
- FIG. 3 a perspective view of the housing formed in the movable guide of an exemplary drive system according to the invention
- FIG. 9 a third example of assembly and non-return blocking of the fixed guide
- FIG. 10 an example of a pre-assembled cassette according to the invention.
- FIG. 10 With reference to the front views of Figures 2a and 2b, is shown an enlargement at two different scales of an example of non-return arm 27 of the fixed guide 24 of a drive system according to the invention.
- the guide 24 extends longitudinally and parallel to the plane "P" transverse (plane of Figures 2a and 2b).
- This fixed guide 24 is sheet metal in the example, material adapted to a fixing of this guide on a hot support as a motor part.
- the fixed guide 24 is fixed on a cylinder block (not shown).
- a slider still designated pad 26 is clipped onto the fixed guide 24.
- the fixed guide 24 is also fixed via the orifice 30 by a pivot 50 (see Figure 5) which jointly encloses the movable guide 25.
- the fixed guide 24 extends laterally with respect to its longitudinal direction X'X in the transverse plane "P" by a non-return arm 27 of width L1 and rounded end 27e.
- This non-return arm 27 is intended to be inserted into a slot 31 of the movable guide (see FIG.
- this non-return arm 27 is provided with a tongue 29 cut in this non-return arm 27.
- This tongue 29 has an end zone 29b raised relative to the plane of the arm 27, as well as in its middle an inclined transition zone 29a giving this tab a shift in "step".
- This end zone 29b is able to be positioned in abutment against a border 32L of the movable guide 25 (see FIGS. 3 and 5) so as to exert a non-return function on the fixed guide 24.
- the portion of the movable guide 25 more particularly the invention is presented with reference to the perspective view of Figure 3.
- this movable guide 25 of plastic material housing 32 is formed. This housing 32 extends along the transverse plane "P" and has an outer wall 32e extending parallel to the transverse plane "P".
- This wall 32e is joined to the wall 25p of the movable guide 25 by two connecting sides 32a and 32b defining at the ends a rounded bottom wall 32f and, by a slot 31 of height "H", access to the housing 32 for the non-return arm 27 (see Figures 2a and 2b).
- the connecting sides 32a and 32b form an angular sector "A”.
- a lumen "L” is cut in the outer wall 32e of the housing 32 and the movable guide 25 has a through-axis bore 40 TT.
- a rib 25n is used as will be described later.
- the non-return arm 27 of the fixed guide 24 is first inserted into the housing 32 of the movable guide 25 by the slot 31 ( Figure 4a). During this step, the passage of the end zone 29b of the tongue 29 causes pressure of this end zone 29b a slight curvature of a band 33 of the outer wall 32e between the light border 32L and the slot 31. The amplitude of the deflection of the wall strip 33 then formed remains small enough for this wall to retain its elasticity, which makes the deformation totally reversible.
- the passage of the end zone 29b is produced by elastic deformation of this extension zone in a groove 25g (see FIG. 3) formed in the wall 25p under the pressure exerted by the outer wall 32e.
- the end 27 of the non-return arm 27 abuts against the rounded bottom wall 32f and fully enters the housing 32 in a non-return blocking step.
- the tongue end zone 29b enters the "L" lumen of the outer wall 32e and at the same time is positioned against the light border 32L.
- the wall strip 33 After clipping on the tongue end 29b, the wall strip 33 returns to its initial configuration due to the suppression of the pressure exerted by the end 29b and the reversibility of its deformation.
- the tab end 29b is clipped, thanks to its elasticity, against said light edge 32L once released from the pressure exerted by the outer wall 32e in the step insertion.
- Clipping allows a non-return lock of the movable guide 25 relative to the fixed guide 24.
- the axis of the orifice 30 formed in the arm 27 is superimposed on the axis through TT of the bore 40 of the movable guide 25 (see Figure 3).
- the rotational mobility of the guide 25 is facilitated by the curvature of the border 32L.
- pivot 50 has an axis of symmetry which coincides with the common transverse axis TT 'of the bore 40 of the movable guide 25 and the orifice 30 of the fixed guide 24.
- This cylindrical pivot 50 comprises a screwing head 51, a threaded nose 52 and a central body 53 connecting the head 51 to the body 52.
- the central body 53 of greater diameter than that of the nose 52, passes without contact the bore 40 of the movable guide 25 and comes against the face 24a of the fixed guide 24.
- the nose 52 passes through the orifice 30 of the fixed guide 24 and the screwing of the nose 52 in the cylinder block (not shown) tightens the body 53 against the face 24a.
- the fixed guide 24 is thus immobilized and the threaded nose 52 is screwed with a clamping without intermediate piece or additional operation (crimping, hooping or welding, etc.), while the movable guide 25 can pivot around the central body 53 via its bore rotation 40.
- Figure 5 also shows in section the non-return arm 27 held in the housing 32 by the end 29b of the tongue 29 coming from this non-return arm 27, this end 29b bearing on the edge 32L of the light "L" of dwelling 32.
- FIG. 6 The cross-sectional view of Figure 6 (in the sectional plane VI - VI of Figure 5) shows more precisely the rectilinear lateral abutments 31 a and 31 b of pivoting of the movable guide 25 formed by the connecting sides. 32a and 32b of the housing 32 (see Figure 3).
- the movable guide 25 can then pivot between these abutments 31a and 31b also forming an angular angle sector "A" flanking the non-return arm 27.
- the rectilinear abutments 31a and 31b come into contact all along the rectilinear edges 27a and 27b of the non-return arm 27.
- the pivoting movement of the movable guide 25 is made relative to to the fixed guide 24 with angular displacements of this pivoting "a" of the abutment 31a and " ⁇ " of the abutment 31b.
- FIGS. 7 and 8 illustrate two steps of assembly and locking of the fixed metal guide 64 and the movable guide of plastic material 65.
- a housing 62 arranged in the movable guide 65, comprises a lug 61 for guiding a rotation of a head 67a of the non-return arm 67 in a circular opening 69, between the two positions illustrated respectively by FIGS. 7 and 8.
- the housing 62 also comprises a slot 63, open at an inlet end 63a extending laterally for receiving the non-return arm 67 (see FIG. 8) in the rotational movement guided by the displacement of the lug 61 in the opening 69.
- the non-return blocking function of the fixed guide 64 is performed by inserting the rectilinear portion 67b of the non-return arm 67 into the slot 63 after passage of the inlet 63a of the slot 63 (see FIG. 8). .
- the open slot 63 has a boss 60 which decreases the height of the slot 63 and the passage of the inlet 63a is made by elastic deformation of the slot 63.
- the boss 60 prevents the return of the arm 67 and defines one of the pivot stops of the movable guide 65 in the slot 63, the other stop being the closed end 63b of the slot 63.
- Figure 9 shows a non-return lock according to a third embodiment.
- the non-return arm 87 of the metal fixed guide 84 has at the end a rounded head 83 introduced, via a slot 80, into the housing 82 formed in the movable plastic guide 85.
- the head 83 is connected to a first section of arm 86 by a neck 88 narrower than the head 83 and the section 86.
- the non-return blocking of the fixed metal guide 84 is then achieved by the action of two clips 81 accommodating in the enlargements 88a formed in the housing 82 on each side of the neck 88, as well as by the guide of the head 83 under a tab 89 arranged in the bottom of the housing 82.
- the movable guide can pivot between the ends 80a of the slot 80.
- Figure 10 shows an example of pre-assembled cassette 10 for internal combustion engine distribution chain drive.
- a cassette 10 makes it easier to mount this drive in the chain well. It comprises a timing chain 2 wound continuously around the two camshaft gears 3a and 3b and the crankshaft pinion motor 3c, and a fixed guide 24 'for holding in position which is mounted on a fixing slide 70 a chain portion 2a.
- the fixed guide 24 ' which extends between the chain portions 2a and 2b connecting the pinions 3a and 3b to the crank pinion 3c, also provides a carrier frame function of the chain 2 and pinions 3a to 3c.
- This pre-assembled cassette 10 also comprises a movable guide 25 of the chain portion 2b, the chain portions 2a and 2b extending facing in the same transverse plane "P".
- This movable guide 25 is movably attached to the guide 24 'as previously described.
- the fixed guide 24 ' has a non-return arm 29 extending laterally with respect to the longitudinal direction YY' of this guide 24 '.
- the cassette 10 comprises a guiding system of the type defined above (see with reference to Figures 2a to 6).
- the movable guide 25 is positioned last, and this movable guide 25 then allows to maintain all the components in place, via the simple assembly method according to the invention, with the anti-return function of the antiretour arm 27 and the pivot function between the upper stops 31a and lower 31b (see Figure 6).
- a translation of the movable guide 25 towards the fixed guide 24 'and simple clipping thus allows to assemble all the elements of the cassette 10.
- the cassette 10 is then pre-assembled and the components are pre-positioned between them for the final assembly inside the engine.
- the stop 31b makes it possible to prevent the tilting back of the mobile guide 24, which allows the pre-assembled cassette to be held, while keeping the chain 2 taut.
- the invention is not limited to the embodiments described and shown. Thus, it is possible to provide other types of immobilization of the fixed guide that the screwing, for example by gluing, crimping or welding. Furthermore, other variants may be implemented to block the tongue against the light edge in the non-return blocking step: a retractable pin coming to erect the end of the tongue, an articulation of the end of the tongue in two positions (flat and rectified), or a portion of arm capable of deforming with a spherical curvature under the effect of pressure.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1755394A FR3067782B1 (fr) | 2017-06-15 | 2017-06-15 | Procede d’assemblage de guides de chaine de distribution de moteur et systeme de guidage d’une chaine de distribution |
PCT/FR2018/051102 WO2018229370A1 (fr) | 2017-06-15 | 2018-05-03 | Procédé d'assemblage de guides de chaine de distribution de moteur et système de guidage d'une chaine de distribution |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3638923A1 true EP3638923A1 (fr) | 2020-04-22 |
Family
ID=59859230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18728686.9A Withdrawn EP3638923A1 (fr) | 2017-06-15 | 2018-05-03 | Procédé d'assemblage de guides de chaine de distribution de moteur et système de guidage d'une chaine de distribution |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3638923A1 (fr) |
CN (1) | CN110753805A (fr) |
FR (1) | FR3067782B1 (fr) |
MA (1) | MA49370A (fr) |
WO (1) | WO2018229370A1 (fr) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19607819A1 (de) * | 1996-03-01 | 1997-09-04 | Bayerische Motoren Werke Ag | Kettentrieb-Einheit für den Nockenwellen-Antrieb einer Brennkraftmaschine |
JP2002089636A (ja) * | 2000-09-13 | 2002-03-27 | Toyota Motor Corp | 環状帯システムのガイド機構 |
JP3336337B1 (ja) | 2001-11-14 | 2002-10-21 | 株式会社椿本チエイン | 伝動装置用プラスチック製可動ガイド |
DE10353643A1 (de) * | 2003-11-17 | 2005-06-16 | Joh. Winklhofer & Söhne GmbH und Co KG | Montagevorrichtung für einen Zugmitteltrieb und Verfahren zu seinem Montieren |
US20050130776A1 (en) * | 2003-12-11 | 2005-06-16 | Borgwarner Inc. | Cassette for securing shipping and assembly of a camshaft drive and timing system |
DE102008020744A1 (de) * | 2007-10-26 | 2009-04-30 | Schaeffler Kg | Montageeinheit eines Zugmitteltriebs |
DE102010005405A1 (de) * | 2010-01-22 | 2011-07-28 | iwis motorsysteme GmbH & Co. KG, 81369 | Spann- und Führungsvorrichtung mit Wärmedehnungsausgleich |
JP5234670B2 (ja) * | 2010-01-28 | 2013-07-10 | 株式会社椿本チエイン | チェーンガイド機構 |
JP5355480B2 (ja) * | 2010-04-09 | 2013-11-27 | 株式会社椿本チエイン | チェーンガイド機構 |
JP5893949B2 (ja) | 2011-02-23 | 2016-03-23 | Ntn株式会社 | チェーンガイド及びチェーンテンショナ装置 |
DE102011075155B4 (de) * | 2011-05-03 | 2019-12-19 | Schaeffler Technologies AG & Co. KG | Montageeinheit für einen Zugmitteltrieb und Zugmitteltrieb |
-
2017
- 2017-06-15 FR FR1755394A patent/FR3067782B1/fr active Active
-
2018
- 2018-05-03 EP EP18728686.9A patent/EP3638923A1/fr not_active Withdrawn
- 2018-05-03 CN CN201880040194.4A patent/CN110753805A/zh active Pending
- 2018-05-03 MA MA049370A patent/MA49370A/fr unknown
- 2018-05-03 WO PCT/FR2018/051102 patent/WO2018229370A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3067782B1 (fr) | 2019-07-12 |
FR3067782A1 (fr) | 2018-12-21 |
WO2018229370A1 (fr) | 2018-12-20 |
CN110753805A (zh) | 2020-02-04 |
MA49370A (fr) | 2021-03-24 |
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