EP4069960A1 - Bielle telescopique de commande pour moteur a taux de compression variable - Google Patents
Bielle telescopique de commande pour moteur a taux de compression variableInfo
- Publication number
- EP4069960A1 EP4069960A1 EP20841974.7A EP20841974A EP4069960A1 EP 4069960 A1 EP4069960 A1 EP 4069960A1 EP 20841974 A EP20841974 A EP 20841974A EP 4069960 A1 EP4069960 A1 EP 4069960A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- engine
- connecting rod
- circuit
- rod
- 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- Withdrawn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
- 230000006835 compression Effects 0.000 title claims abstract description 26
- 238000007906 compression Methods 0.000 title claims abstract description 26
- 238000005461 lubrication Methods 0.000 claims abstract description 25
- 125000006850 spacer group Chemical group 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000001050 lubricating effect Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 33
- 238000002485 combustion reaction Methods 0.000 description 23
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 239000010687 lubricating oil Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002789 length control Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/02—Arrangements of lubricant conduits
-
- 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
- F02B75/048—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable crank stroke 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
- F01M2001/066—Connecting rod with passageways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/02—Arrangements of lubricant conduits
- F01M2011/025—Arrangements of lubricant conduits for lubricating gudgeon pins
Definitions
- the present invention relates to the field of variable compression ratio engines comprising a system for controlling said ratio.
- the invention relates in particular to a telescopic control rod included in said control system.
- variable compression - turbo for “variable compression - turbo” developed by the Nissan group and described in particular in document EP2787196. It comprises four cylinders and four combustion pistons 10. Each combustion piston 10 is connected to a return member 12 by a main connecting rod 11 (FIG. 1).
- the return member 12 comprises three axes of rotation 12a, 12b, 12c, parallel to the x axis of rotation of the crankshaft 13, to establish three pivot links, respectively with the main connecting rod 11, with a crank pin of the crankshaft 13 and with the foot 20a of a control rod 20.
- the head 20b of the control rod 20 is mounted on an eccentric shaft 22 with an axis parallel to the x axis of rotation of the crankshaft 13.
- the four control rods 20, associated with the four combustion pistons 10, establish a pivot connection with said eccentric shaft 22.
- the latter comprises a central lever 23 connected to one end of a rod 24, the other end of the rod 24 being connected to another lever 25 integrated into an electrical control means 26, for example a movable arm in rotation actuated by a motor.
- each return member 12 When the movable arm 25 of the piloting means 26 is actuated, the rod 24 changes position, and causes the rotation of the eccentric shaft 22 around its own axis, simultaneously modifying the position of the four control rods 20.
- the new position of the control rods 20 induces a change in position of the return members 12.
- the third pivot link 12c which each return member 12 establishes with each control rod 20, changes position in the plane (y, z) normal to the x-axis of the crankshaft 13 under the effect of the traction or the thrust of the control rod 20; the first pivot connection 12a of each return member 12 is then moved in the plane (y, z) by a lever effect, which causes the stroke of all the combustion pistons 10 in the cylinders to change.
- Such a control system 2 therefore makes it possible to vary the compression ratio of the engine 100. It nevertheless has the drawback of controlling the pistons of the four cylinders in an inseparable manner, which can impact the energy performance of the engine 100.
- Document DE102010019756 describes a variable compression ratio engine comprising a movable coupling 1 similar to that described above.
- the control system 2 is different, it incorporates adjustment devices comparable to variable-length control rods, including the heads are in a pivot connection, each connected independently with the engine block.
- the variation in the length of an adjustment device modifies the position of the return member connected to the other end of said device, which causes the stroke of the associated combustion piston to change.
- the compression ratio of each piston can thus be controlled independently by the associated control rod.
- the present invention aims to achieve all or part of the aforementioned objectives by proposing a telescopic control rod included in a control system for controlling an engine with a variable combustion rate.
- the invention relates to a telescopic control rod for a variable compression ratio engine comprising: a small end with a longitudinal axis, having, at one end, an eyelet intended to establish a pivot connection with a return member of the engine and having, at another end, a piston, and
- a big end serving as a cylinder body in which said piston defines a first and a second hydraulic chamber, the respective filling and emptying of which modify the length of the connecting rod, and a third lateral chamber situated between the first and the second chamber;
- the big end further comprising two coaxial lateral bearings, of transverse axis normal to the longitudinal axis, intended to establish a pivot connection with a fixed part of the engine;
- a lubrication circuit comprising at least a first duct arranged in the big end, establishing fluid communication between an internal space of each lateral bearing and the third chamber, regardless of the length of the connecting rod, and comprising at least a second duct arranged in the small end, in fluid communication with the third chamber and opening into the eyelet.
- each side bearing has a shoulder to ensure positioning along the transverse axis of the connecting rod relative to the fixed part of the engine
- the third chamber has an annular shape, to facilitate free passage of the oil from the lubrication circuit between the two lateral bearings of the connecting rod;
- the connecting rod comprises a spacer attached to each side bearing and intended to be integral with the fixed part of the engine, each spacer comprising at least one supply duct intended to supply the internal space of the side bearing with oil and to lubricate a surface external of said bearing, when the connecting rod is mounted in the engine;
- the connecting rod comprises a shouldered ring interposed between a side bearing and its attached spacer, to limit the friction associated with the oscillation movement of the control rod relative to the fixed part of the engine;
- the connecting rod comprises a control circuit, independent of the lubrication circuit, to establish or close fluid communication between the first chamber and the second chamber;
- control circuit comprises a first hydraulic spool and a second hydraulic spool, respectively housed in the first and the second lateral bearing of the connecting rod:
- each hydraulic spool is intended to be in contact via a ball with a pilot piston carried by the fixed part of the engine, each pilot piston being capable of being moved by an oil pressure from a pilot circuit, independent the lubrication circuit and the control circuit, to induce the movement of the associated spool;
- the connecting rod comprises a rewash circuit comprising at least one bore and a non-return valve, so as to allow circulation of oil from the third chamber to one of the other two chambers;
- the connecting rod comprises a discharge circuit comprising at least one bore and a non-return valve between the first or the second chamber and the outside of the connecting rod, so as to evacuate oil from the control circuit when the pressure in said circuit exceeds a determined maximum pressure.
- Figure 1 shows a mobile coupling and a variable compression ratio control system in an engine according to the state of the art
- Figure 2 shows a side view of a mobile coupling and a control system of an engine with variable compression ratio, said system including a control rod according to the invention
- Figures 3a and 3b show a control rod for a variable compression ratio engine according to the invention
- Figures 4a and 4b show a plurality of contiguous control rods, intended for a variable compression ratio engine, and respectively in accordance with a first (4a) and a second (4b) embodiment of the invention; these figures illustrate in particular the lubrication circuit of said control rods;
- Figures 5a and 5b show all or part of a control rod for a variable compression ratio engine, according to a first embodiment of the invention
- Figures 6 and 7 show a control rod according to a first embodiment of the invention, illustrating in particular the control circuit and the control circuit of said rod; • Figures 8a, 8b, 9a and 9b show a control rod according to a second embodiment of the invention, illustrating in particular the control circuit and the control circuit of said rod.
- the mobile coupling 1 comprises a crankshaft 13, at least one combustion piston 10 intended to slide in a combustion cylinder 50 (partially shown in FIG. 2). Said cylinder 50 is integrated in an engine block (not shown).
- the combustion piston 10 is intended to move between a bottom dead center PMB and a top dead center PMH.
- the top dead center TDC corresponds to the moment when the piston 10 is at the highest point of its stroke in the cylinder 50, just before it starts again in the other direction.
- TDC top dead center can be reached at different altitudes: for the maximum compression ratio, TDC top dead center will be at the maximum altitude Amax; for the minimum compression ratio, the top dead center TDC will be at the altitude Amin and for an intermediate compression ratio, it will be between these two altitudes Amax, Amin.
- the mobile coupling 1 comprises at least one main connecting rod 11 connected at one end to the combustion piston 10. It also comprises at least one return member 12 connected, on the one hand, to the other end of the main connecting rod 11, on the other hand to a crank pin of the crankshaft 13 and finally to a foot 30a of a control rod 30. More particularly, the return member 12 has three axes of rotation to establish a first 12a, a second 12b and a third 12c pivot connections respectively with the main connecting rod 11, with the crankpin of the crankshaft 13 and with the foot 30a of the control rod 30 (described below).
- the engine 100 also includes a compression ratio control system 3.
- Said system 3 comprises at least one control rod 30 of variable length, associated with a combustion piston 10. The modification of the length of the control rod 30 makes it possible to modify the altitude of the top dead center TDC of the combustion piston 10. in its cylinder 50, to vary the compression ratio of the engine.
- the head 30b of the control rod 30 establishing a pivot connection along an axis normal to the plane (x, y) with a fixed part 51 integral with the engine block, the variation in length of said rod 30 will modify the position, in the plane (y, z), of the third pivot connection 12c of the return member 12 and consequently the position of the first pivot connection 12a: this causes the change of stroke of the associated combustion piston 10, either in d 'other words the altitude of the top dead center TDC of said piston 10.
- the control rod 30 is a telescopic rod having a foot 30a and a head 30b. His foot 30a extends along a longitudinal axis L, and has, at one of its ends, an eyelet in which the return member 12 is housed at its third pivot connection 12c.
- the foot 30a of the connecting rod 30 comprises, at its other end, a hydraulic piston 34 capable of sliding in a cylinder body arranged in the head 30b of the connecting rod 30 (FIG. 3a).
- a first chamber 31 and a second chamber 32 are defined in said cylinder body, on either side of the hydraulic piston 34 which incorporates seals.
- the first chamber 31 is called a “high pressure chamber” because it takes up the combustion forces; in contrast, the second chamber 32 is called a "low pressure chamber”.
- the respective filling and emptying of the first 31 and of the second 32 chambers modify the length of the connecting rod 30.
- control rod 30 comprises a return device 341, tending to reduce it to a minimum length, corresponding here to the maximum compression ratio of the engine.
- a return device 341 tending to reduce it to a minimum length, corresponding here to the maximum compression ratio of the engine.
- the head 30b of the control rod 30 comprises in its internal part the bore of the jack; this bore is closed by a cover fixed for example by means of four screws.
- the hydraulic piston 34 is provided so as to have equivalent sections at the level of the two chambers 31, 32.
- the hydraulic piston 34 also defines a third lateral chamber 33, located between the first chamber 31 and the second chamber 32. It is called “lateral” because it is arranged between the lateral internal walls of the cylinder body and those of the hydraulic piston 34.
- the head 30b of the control rod 30 comprises two coaxial side bearings 35 of transverse axis T normal to the longitudinal axis L (FIG. 3b). These side bearings 35 are intended to establish a pivot connection with a fixed part 51 integral with the engine block. The lateral position of said bearings 35 makes it possible to compact the control rod 30 with respect to a conventional jack with the connection points at the ends, thus limiting the bulk in the engine block.
- each lateral bearing 35 has a shoulder 35a to ensure the positioning of the connecting rod 30, along the transverse axis T, relative to the fixed part 51 of the engine.
- the transverse axis T is intended to be parallel to the x axis of the crankshaft 13, when the control rod 30 is mounted in the engine 100.
- the control rod 30 further comprises a lubrication circuit 36 ( Figures 4a, 4b).
- this circuit 36 is supplied with a low pressure lubricating oil, typically between 2 and 6 bars. It comprises at least a first duct 36a arranged in the big end 30b, establishing fluid communication between an internal space of each lateral bearing 35 and the third chamber 33, regardless of the length of the connecting rod 30.
- the third chamber 33 has an annular shape, to facilitate free passage of the oil from the lubrication circuit between the two side bearings 35 of the connecting rod 30.
- the lubrication circuit 36 comprises at least a second duct 36b arranged in the small end 30a, in fluid communication with the third chamber 33 and opening into the eyelet.
- This ingenious architecture of the control rod 30 allows oil to be conveyed from the side bearings 35 to the eyelet, for the lubrication of the pivot connection 12c of the latter with the return member 12.
- the control rod 30 comprises a spacer 52 attached to each lateral bearing 35, illustrated in FIGS. 5a and 5b.
- the added spacers 52 are intended to be integral with the fixed part 51 of the engine. It will be recalled that the fixed part 51 is integral with the block supporting the crankshaft 13.
- the connection between the side bearings 35 and the attached spacers 52 allows the oscillating movement of the control rod 30 necessary for the operation of the control system 3 in the engine 100.
- each added spacer 52 has a cylindrical internal housing, to accommodate a side bearing 35.
- the outer casing of the spacer 52 may also be cylindrical. It may nevertheless be advantageous to provide an ovoid outer casing to block any movement of the rotation of the spacer 52 vis-à-vis the fixed part 51 of the motor. Provision can also be made for the internal housing accommodating a lateral bearing 35 to be eccentric with respect to the central axis of the external casing of the attached spacer 52, which will be chosen in this case cylindrical or ovoid: this also provides an anti -rotation.
- the control rod 30 comprises a shouldered ring 53 interposed between each lateral bearing 35 and its attached spacer 52, to limit the friction associated with the oscillation movement of the control rod 30 relative to the fixed part 51 of the engine, and to partially take up the combustion forces as well as those of inertia of the mobile coupling 1.
- the shouldered ring 53 may for example be formed from a material such as steel or bronze.
- Each insert spacer 52 comprises at least one supply duct 52a intended to convey the lubricating oil in the internal space of the side bearing 35 and on an external surface of said bearing 35, when the connecting rod 30 is mounted in the engine 100.
- the external supply 54 of low pressure lubricating oil coming from the fixed part 51 of the engine, thus communicates with the supply duct 52a of the attached spacer 52, which communicates with an internal space of a side bearing 35, for conveying the lubricating oil to the third chamber 33 (via the first duct 36a of the lubrication circuit 36), and with an external space of a side bearing 35, for lubricate the pivot connection between the connecting rod 30 and the fixed part 51 of the engine.
- all the attached spacers 52 may include a supply duct 52a directly in fluid communication with the external supply 54 of lubricating oil. (general motor supply circuit 100).
- a supply duct 52a directly in fluid communication with the external supply 54 of lubricating oil.
- the added spacer 52 of the first connecting rod 30 at one end of the alignment of the four connecting rod heads 30b, and the added spacer 52 of the fourth connecting rod 30 at the other end comprise a duct supply 52a directly in fluid communication with the external supply 54 of lubricating oil (FIG. 4b).
- the presence of the added spacers 52 facilitates the mounting of the control rod (s) 30 in the engine 100. In fact, they allow individual insertion of each telescopic rod 30 in the bearings fitted out of the cylinder block. (fixed part 52 of the engine). Without the presence of these spacers 52, it would be necessary to mount all the control rods 30 on the cylinder block at the same time.
- the control rod 30 advantageously comprises a control circuit 37, independent of the lubrication circuit 36, to establish or close a fluid communication between the first chamber 31 and the second chamber 32, and allow the transfer of fluid (oil in l occurrence) from room to room.
- control circuit 37 is capable of having an oil pressure different from that of the lubrication circuit 36, in this case a higher pressure.
- these two circuits can communicate by means of a so-called regavage valve, allowing the circulation of oil from the lubrication circuit 36 to the control circuit 37, when the pressure in the latter goes below. of the oil pressure in the lubrication circuit 36.
- the oil circulating in the control circuit 37 therefore has the same nature here as the lubricating oil.
- the supply of oil to the first chamber 31 and the emptying of the second chamber 32 drives the connecting rod 30 towards its minimum length; conversely, the supply of the second chamber 32 with oil and the emptying of the first chamber 31 controls the connecting rod 30 towards its maximum length.
- the control rod 30 can remain at an intermediate length.
- control circuit 37 comprises oil passages (37a, 37b), for example in the form of bores made in the big end 30b, making the first 31 and second 32 chambers communicate with each other.
- the control circuit 37 also comprises fluidic distributors, preferably carried by the connecting rod head 30b, making it possible to open or close said oil passages and to manage the direction of circulation of the oil between the two chambers 31, 32.
- fluidic distributors preferably carried by the connecting rod head 30b, making it possible to open or close said oil passages and to manage the direction of circulation of the oil between the two chambers 31, 32.
- the hydraulic control circuit 37 comprises a first hydraulic spool 371 and a second hydraulic spool 372, respectively housed in the first side bearing 35 and the second side bearing 35 of the connecting rod.
- the two spools are arranged along the transverse axis T, coaxially with the side bearings 35. This orientation prevents the hydraulic spools 371,372 from undergoing inertia and / or combustion forces applying to the connecting rod 30, which could interfere with the actuation of said drawers.
- a movement along the transverse axis T of the first hydraulic spool 371 makes it possible for example to establish an oil circulation (shown diagrammatically by the black arrows on the FIG. 6) from the first chamber 31 to the second chamber 32, via first passages 37a arranged in the big end 30b.
- the movement of the first slide 371 places the first passages 37a leading to the two chambers 31, 32 in communication, and a first non-return valve 37c is arranged on said first passages 37a, allowing only a circulation of fluid from the first chamber 31 towards the second chamber 32 (FIG. 7 (a), (b)).
- a movement of the second hydraulic spool 372 makes it possible to establish a circulation of oil from the second chamber 32 to the first chamber 31, via second passages 37b arranged in the big end 30b.
- the movement of the second slide 372 places the second passages 37b leading to the two chambers 31, 32 in communication, and a second non-return valve 37d is arranged on said second passages 37b, allowing only a circulation of fluid from the second chamber 32. to the first bedroom 31.
- the hydraulic control circuit 37 comprises a first hydraulic spool 371 'and a second hydraulic spool 372', each housed in the big end 30b.
- the two sliders are arranged parallel to the transverse axis T. As mentioned above, this orientation prevents the hydraulic sliders 371,372 from undergoing the inertia and / or combustion forces applied to the connecting rod 30.
- Each hydraulic spool 371 ', 372' advantageously comprises a non-return valve mechanism, which only allows oil to circulate in one direction (FIG. 8 (b)).
- the drawers 371 ', 372' block all communication between the rooms 31, 32.
- a movement along the transverse axis T of the first hydraulic spool 371 'in its housing makes it possible for example to establish a circulation oil from the first chamber 31 to the second chamber 32, via first passages 37a ′ arranged in the big end 30b.
- the movement of the first drawer 371 ' puts the first passages 37a' leading to the two chambers 31, 32 in communication, by only allowing a circulation of fluid from the first chamber 31 to the second chamber 32.
- a displacement of the second hydraulic spool 372 ′ makes it possible to establish an oil circulation from the second chamber 32 to the first chamber 31, via second passages 37b arranged in the big end 30b.
- the connecting rod 30 puts another hydraulic circuit, called a control circuit 55, is implemented.
- the control circuit 55 is supplied with a pressurized fluid (air, gas, oil or other liquid) coming from the fixed part 51 of the engine.
- one actuation of the fluidic distributors of the control circuit 37 can be operated mechanically.
- Such an option can be advantageous in that it avoids sometimes complex management of the seal between fixed and mobile parts.
- the movement of the hydraulic spools 371,372 is controlled by mechanical actuation.
- each hydraulic slide 371.372 is intended to be in contact via a ball 553 with a pilot piston 551.552 carried by the fixed part 51 of the engine, and more particularly carried by the attached spacer 52.
- Each pilot piston 551.552 can be moved by the oil pressure (shown diagrammatically by the white arrows on the FIG. 6) in the control circuit 55, independent of the lubrication circuit 36 and of the control circuit 37, to induce the displacement of the associated hydraulic spool 371,372.
- the control circuit 55 is here totally external to the control rod 30.
- the oil of this circuit 55 is conveyed via conduits 55a, 55b from the fixed part 51 of the engine to an internal housing of each attached spacer 52, which housing accommodates the pilot piston 551.552.
- the mechanical contact between the pilot piston 551.552 and the hydraulic spool 371.372 is provided by a ball 553, which is capable of accommodating the oscillation of the connecting rod 30 with respect to the fixed elements of the engine, including in particular with respect to the pilot piston. 551,552.
- This configuration therefore provides a simple and robust solution for the external control of the hydraulic control circuit 37 of the connecting rod 30.
- the control circuit 55 establishes a fluid connection between the fixed part 51 and the lateral bearings 35 of the control rod 30 movable in rotation.
- the movement of the hydraulic spools 371 ', 372' is controlled by fluidic actuation.
- Such a connection can be made, for example, as illustrated in FIG. 9 (a) and (b) by using oscillating joints between fixed and movable parts.
- each hydraulic slide 371 ', 372' is intended to be moved by the oil pressure of the pilot circuit 55.
- Conduits 55a ' are arranged in the big end 30b from a central point of a first bearing.
- Ducts 55a are also arranged in the attached spacer 52 and communicate with the fixed part 51 of the engine.
- the fluid connection between a duct 55a 'of the movable part (connecting rod 30) and a duct 55a of the fixed part 51 is established via two rings 554,555 centered on the conduits 55a ', 55a, the contacting faces of which are ground ( Figure 9 (a), (b)).
- a first ring 554 is integral with the side bearing 35, a second ring 555 is carried by the attached spacer 52 and can rotate slightly on its axis because it is mounted on an externally domed ring 558, absorbing any defects in geometry between the faces in touch.
- the movement of the second ring 555 is limited to an axial movement thanks to the presence of a pin 557.
- the contact between the two faces of the first 554 and second 555 rings is made permanently thanks to the combined action of the springs 556 and due to the oil pressure inside the rings 554.555 greater than the pressure outside the rings 554.555.
- Each hydraulic spool 371 ', 372' can thus be moved by the oil pressure (shown schematically by the white arrow in figure 8 (b)) in the pilot circuit 55, independent of the lubrication circuit 36 and the control circuit 37.
- control rod 30 can, moreover, comprise a rewashing circuit 38 comprising at least one bore 38a and a non-return valve 38b, between the third chamber 33 and one of the other two chambers 31, 32 ( Figure 7 (a) and (c), Figure 8 (a)).
- the non-return valve 38b is configured so as to allow an oil circulation from the third chamber 33 to one of the other two chambers 31, 32 (to the second chamber 32 in the example of FIG. 7 (c)) ), when the pressure in said chamber 31, 32 is lower than the pressure in the third chamber 33.
- Such a configuration is advantageous in that the third chamber 33, supplied by the lubrication circuit 36, is used to replenish the circuit of control 37, when the pressure in the chamber 31,32 connected to the regavage circuit 38 passes below the lubricating oil pressure.
- the object of this regwashing circuit 38 is to raise the average pressure in the chambers 31 and 32 above the supply pressure available in the third chamber 33 thanks to the pump effect generated by the alternation of the forces. . It also compensates for any leaks in the system. Rewashing is effective due to the proximity between the third chamber 33 and one of the other two 31,32.
- the rewashing circuit will be made to communicate with the second chamber 32, that is to say the one which is not subjected to the combustion forces transmitted by the mobile coupling 1 because the forces generated by the combustion are generally greater than those generated by the inertias, which means that the second chamber 32 will see the greatest depression and the lowest instantaneous pressure, thus improving the regavage.
- the control rod 30 may further comprise a discharge circuit 39 comprising at least one bore 39a and a non-return valve 39b between the first 31 or the second 32 chambers and the outside of the rod 30, so as to evacuate the oil of the control circuit 37, when the pressure in said circuit 37 exceeds a determined maximum pressure.
- a discharge circuit 39 comprising at least one bore 39a and a non-return valve 39b between the first 31 or the second 32 chambers and the outside of the rod 30, so as to evacuate the oil of the control circuit 37, when the pressure in said circuit 37 exceeds a determined maximum pressure.
- a non-return valve 39b whose opening pressure is greater than 200 bars or 300 bars.
- the role of such a discharge circuit 39 is to limit the increase in average pressure in the control circuit 37, and in particular in the first 31 and the second 32 hydraulic chambers.
- the instantaneous pressures in the chambers 31, 32 which pass through peaks due to inertia and / or combustion forces transmitted, are also limited, which allows existing and high-performance sealing solutions at a lower cost for the connecting rod. order 30.
- the control system according to the present invention for an engine with variable compression ratio, comprises one or more control rod (s) as described above.
- the mobile coupling 1 of the engine 100 described in the introduction, integrating the combustion pistons 10, the main connecting rods 11, the return members 12 and the crankshaft 13 can remain unchanged as well as the upper part of the engine.
- the shape of the telescopic control rods is designed to fit into the current size of the engine, thus avoiding increasing the center distance of the engine 100.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1913799A FR3104220B1 (fr) | 2019-12-05 | 2019-12-05 | Bielle télescopique de commande pour moteur à taux de compression variable |
| PCT/FR2020/052281 WO2021111089A1 (fr) | 2019-12-05 | 2020-12-04 | Bielle telescopique de commande pour moteur a taux de compression variable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4069960A1 true EP4069960A1 (fr) | 2022-10-12 |
Family
ID=69743454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20841974.7A Withdrawn EP4069960A1 (fr) | 2019-12-05 | 2020-12-04 | Bielle telescopique de commande pour moteur a taux de compression variable |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230349333A1 (fr) |
| EP (1) | EP4069960A1 (fr) |
| CN (1) | CN114930005A (fr) |
| FR (1) | FR3104220B1 (fr) |
| WO (1) | WO2021111089A1 (fr) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003322036A (ja) * | 2002-05-07 | 2003-11-14 | Nissan Motor Co Ltd | 内燃機関の可変圧縮比機構 |
| JP4134658B2 (ja) * | 2002-09-27 | 2008-08-20 | 日産自動車株式会社 | レシプロ式可変圧縮比機関 |
| JP3945419B2 (ja) * | 2003-02-24 | 2007-07-18 | 日産自動車株式会社 | レシプロ式可変圧縮比機関 |
| JP2009036128A (ja) * | 2007-08-02 | 2009-02-19 | Nissan Motor Co Ltd | 複リンク式可変圧縮比エンジン |
| US7827943B2 (en) * | 2008-02-19 | 2010-11-09 | Tonand Brakes Inc | Variable compression ratio system |
| DE102010004593B4 (de) * | 2010-01-14 | 2016-03-10 | Audi Ag | Brennkraftmaschine mit variabler Verdichtung und einteiligen Anlenkpleueln |
| DE102010019756A1 (de) | 2010-05-07 | 2011-11-10 | Daimler Ag | Verfahren zum Betreiben einer Hubkolbenmaschine |
| WO2013080674A1 (fr) | 2011-11-29 | 2013-06-06 | 日産自動車株式会社 | Moteur à combustion interne à taux de compression variable |
| US8851030B2 (en) * | 2012-03-23 | 2014-10-07 | Michael von Mayenburg | Combustion engine with stepwise variable compression ratio (SVCR) |
| FR3043739B1 (fr) * | 2015-11-17 | 2018-06-15 | MCE 5 Development | Bielle pour moteur a rapport volumetrique variable |
| DE102016114978A1 (de) * | 2016-05-18 | 2017-11-23 | Hilite Germany Gmbh | Pleuel für eine Brennkraftmaschine mit variabler Verdichtung |
| FR3063307B1 (fr) * | 2017-02-28 | 2019-03-29 | MCE 5 Development | Dispositif presseur pour exercer un effort de maintien sur un dispositif de transmission et moteur muni d’un tel dispositif. |
-
2019
- 2019-12-05 FR FR1913799A patent/FR3104220B1/fr not_active Expired - Fee Related
-
2020
- 2020-12-04 WO PCT/FR2020/052281 patent/WO2021111089A1/fr not_active Ceased
- 2020-12-04 US US17/756,954 patent/US20230349333A1/en not_active Abandoned
- 2020-12-04 EP EP20841974.7A patent/EP4069960A1/fr not_active Withdrawn
- 2020-12-04 CN CN202080091701.4A patent/CN114930005A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021111089A1 (fr) | 2021-06-10 |
| US20230349333A1 (en) | 2023-11-02 |
| CN114930005A (zh) | 2022-08-19 |
| FR3104220A1 (fr) | 2021-06-11 |
| FR3104220B1 (fr) | 2021-12-24 |
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