JP2017078419A - Large turbocharged two-stroke internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large turbocharged two-stroke internal combustion engine of a crosshead type of which the weight and the cubic volume are minimized without large stress or vibration.SOLUTION: The present invention relates to a large turbocharged two-stroke internal combustion engine of a crosshead type comprising a lubrication fluid supply part, and at least one connecting rod having a first hole configured to be connected to a crosshead, a second hole configured to be connected to a crankpin and a rod part between the first hole and the second hole. The connecting rod has an axial extension and further comprises a fluid channel configured to supply the lubrication fluid to at least one of the first hole and the second hole. The connecting rod comprises a center part and a third hole. The third hole is arranged in the rod part closer to one of a first bearing and a second bearing than the center part, and the third hole is configured to modify a stiffness of the connecting rod at least in the axial extension.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a two-stroke internal combustion engine with a crosshead type large turbocharger comprising a lubrication fluid lubrication supply section and at least one connecting rod.

  In an internal combustion engine known from, for example, US Pat. No. 6,057,049, such as a large two-stroke diesel engine in a marine vessel, the weight and volume of the engine in order to reduce engine costs and to create a larger space on the vessel, for example a larger container. Attempts to minimize are becoming more and more important and constantly evolving. In particular, while minimizing large components, such as connecting rod bearings, without reducing the life of the connecting rod, bearings and engine, it is still possible to supply lubricant to the bearing and transmit the same load. , Has become an area of emphasis.

U.S. Pat. No. 4,515,110

  The object of the present invention is to completely or partially overcome the above disadvantages and drawbacks of the prior art. More specifically, this object is an improved crosshead type two-stroke internal combustion engine with a large turbocharger that does not introduce significant stresses into the components and their connections, or bearings or kinematics. It is to provide a two-stroke internal combustion engine with a crosshead type large turbocharger in which the weight and volume of the engine are minimized without causing negative effects on mechanical instability and vibration of the engine.

The above objectives, as well as numerous other objectives, advantages and features that will become apparent from the following description, are:
A two-stroke internal combustion engine with a crosshead type large turbocharger,
-A lubrication fluid lubrication supply;
A first end having a first hole configured to be connected to the crosshead via a first bearing and configured to be connected to a crank pin via a second bearing; At least one connecting rod comprising: a second end having a second hole; and a rod portion between the first hole and the second hole, the connecting rod having an axial extension line. A connecting rod, the connecting rod further comprising a fluid channel configured to supply lubricating fluid to at least one of the first hole and the second hole;
With
The connecting rod includes a central portion and a third hole, and the third hole is disposed in the rod portion closer to one of the first bearing and the second bearing than the central portion, and the third hole is The solution according to the invention is achieved by a two-stroke internal combustion engine with a crosshead type large turbocharger, which is arranged to change the rigidity of the connecting rod at least in the axial extension.

  By having a third hole in the rod portion closer to one of the first and second bearings than the central portion, the rigidity is such that the connecting rod is substantially thinner and the first and second holes are It is distributed in the connecting rod so as to be formed substantially smaller, thereby reducing the overall length of the crankshaft and thus reducing the overall size of the two-stroke internal combustion engine with a large turbocharger.

  In addition, a fluid channel may extend from the first hole to the second hole.

  Further, the fluid channel may be configured to supply a lubricating fluid through the second hole to a bearing in the second hole.

  Further, the third hole may extend perpendicular to the axial extension line.

  The central portion may be disposed in the middle of the connecting rod between the first hole and the second hole.

  In addition, a third hole may extend across the fluid channel, thereby defining an intermediate outlet and an intermediate inlet of the fluid channel, and both the intermediate outlet and the intermediate inlet may face the third hole. .

  In addition, the connecting rod may comprise an additional third hole on the opposite side of the fluid channel.

  Furthermore, an additional third hole may be closer to the first end.

  Further, the third hole may be closer to the second end than the first end.

  Further, the third hole may be closer to the first end than the second end.

  The connecting rod may further comprise a connecting element having a bore and disposed in the third hole for fluidly connecting the intermediate outlet and the intermediate inlet.

  Further, the bore may form part of the fluid channel.

  In addition, the connecting element may comprise a tubular part extending into the intermediate inlet.

  Furthermore, the connecting element may be a tubular part extending from the first hole into the intermediate inlet.

  Further, the tubular portion may extend partially through the rod portion.

  Also, the tubular part of the connecting element may extend into the intermediate outlet.

  The tubular portion may be a flexible tube.

  Furthermore, the connecting element comprises a first part comprising a first section of the bore and a second part comprising a second section of the bore, the first part being in relation to the second part It may be slidable and may fluidly connect the first section and the second section of the bore.

  Further, the connecting element may be configured to absorb the deformation of the third hole along the axial extension.

  Also, the first part of the connecting element may slide partially within the second part of the connecting element.

  Furthermore, the first part of the connecting element may be a male part that extends into the second part, for example during deformation of the third hole.

  The male part may be a tubular part.

  Further, the connecting rod may have a radial clearance of 0.05 mm-1.0 mm, preferably 0.05 mm-0.5 mm, between the male part and the second part.

  Furthermore, the first part and the second part may be fastened to the rod part.

  Furthermore, the first part may comprise a base part and a tubular part.

  Further, the second portion may comprise a base portion having a second section of the bore.

  Also, the tubular portion of the first portion may extend partially into the bore of the second portion.

  Furthermore, the base part may be fastened to the rod part, for example by screws or bolts.

  In addition, the connecting rod has a first protruding portion and a second protruding portion that extend into the third hole along the axial extension line, the first protruding portion forming an intermediate outlet. The second protruding portion may form an intermediate inlet.

  Further, the third hole may be substantially H-shaped or substantially I-shaped.

  Additionally, the fluid channel may have a predetermined diameter and the diameter may decrease at the second hole.

  Further, a bearing ring may be disposed in the second bore and the fluid channel outlet may be adjacent to the bearing ring.

  The fluid channel may also terminate at two outlets disposed at a predetermined circumferential distance from the axial extension along the second hole.

  Further, the first end of the connecting rod may comprise a crosshead portion connected to the rod portion, thereby forming a first hole.

  In addition, the second end of the connecting rod may comprise a crankpin portion connected to the rod portion, thereby forming a second hole.

  The present invention also relates to a ship provided with the above-described two-stroke internal combustion engine with a large turbocharger.

  The invention and many of its advantages are described in more detail below with reference to the accompanying schematic drawings, which show several non-limiting embodiments for purposes of illustration.

1 shows a partial cross-sectional view of a two-stroke internal combustion engine with a large turbocharger. The connecting rod is shown in perspective view. FIG. 3 shows a cross-sectional view of a portion of the connecting rod. FIG. 6 shows a cross-sectional view of a portion of another connecting rod. Fig. 2 shows a connecting rod having two third holes. Fig. 4 shows another connecting rod having two third holes. Figure 3 shows another connecting rod.

  All the figures are very schematic and not necessarily to scale, they only show those parts that are necessary to explain the invention and other parts are omitted or simply suggested Is done.

  FIG. 1 shows a two-stroke internal combustion engine 1 with a crosshead type large turbocharger comprising a lubrication fluid lubrication supply unit 2 and a connecting rod 3. The connecting rod 3 has a first end 4 having a first hole 5 configured to be connected to the crosshead 6 and a second hole 8 configured to be connected to the crank pin 9. And a second end portion 7. The connecting rod 3 further comprises a rod portion 10 between the first end 4 and the second end 7. The connecting rod 3 comprises a third hole 12 arranged in the rod part 10 closer to one of the bearings than the central part 13 (shown in FIG. 2), the third hole being an axis (shown in FIG. 2) The rigidity of the connecting rod 3 in the direction extension line L is changed.

  By having the third hole 12, the connecting rod 3 has less stiffness or less rigidity, and the force applied to the crankpin 9 by the connecting rod 3 is free of the third hole. Distributing over the contact surface of the second hole 8 which is larger than that of the prior art disclosing the connecting rod, and the connecting rod 3 is made substantially thinner and the first hole 5 and the second hole 8 are substantially Therefore, the bearings in the crankpin 9 and the crosshead 6 can be made smaller without deteriorating the bearing performance. By reducing the thickness t (shown in FIG. 2) of the connecting rod 3, the crankshaft 35 (shown in FIG. 1) can also be made substantially shorter, thereby substantially reducing the overall length of the engine. While reducing, it has a positive effect on kinematic instability and engine vibration. Thus, by providing a third hole 12, the overall volume of the engine is greatly reduced and more space is provided for the cargo. Furthermore, by reducing the size of the connecting rod 3 and thus the engine, the total weight of the engine is also substantially reduced, which reduces the total weight of the ship and the costs associated with transporting the load. Bring things.

  When transmitting a force from one component to another, the pressure applied in the force transmission forces the lubricant away from the force transmission point, so it may be extremely difficult to obtain sufficient lubrication. is there. In particular, when transmitting force between the connecting rod and the crankpin, the strong force pushes the lubricating fluid, e.g. oil, away from the transmission point and further lubricant injection becomes almost impossible during transmission . Optimal oil film pressure, bearing clearance, oil film thickness, and stress and strain in the bearing are seen as the main criteria when sizing crankpin and crosshead bearings for large two-stroke engines. Therefore, lubricating fluid can be supplied to the bearing between the connecting rod and the crankpin / crosshead, thereby reducing the stress at these connections to obtain the optimum oil film thickness and oil film pressure. It is important to be able to

  When distributing the pressure over a larger range, the oil film, i.e. the lubricating fluid, is easily applied by the connection between the connecting rod and the crankpin, and the lubricating fluid is distributed over a large surface area as well, so that the second The lubricating layer is made uniform in the holes 8.

  In FIG. 2, the connecting rod 3 includes a central portion 13 disposed in the middle of the connecting rod 3 between the first hole 5 and the second hole 8. The connecting rod 3 further comprises a fluid channel 11 extending from the first hole 5 to the second hole 8 along the axial extension line L of the connecting rod 3. The fluid channel 11 is configured to supply lubricating fluid from the first hole 5 to the second hole 8. Lubricating fluid is carried through the crosshead 6 to supply the lubricating fluid to the first bearing 14 in the first hole 5. The lubricating fluid flows through the fluid channel 11 to supply the lubricating fluid to the second bearing 15 in the second hole 8. The third hole 12 extends perpendicularly to the axial extension line L, and the third hole 12 is a through hole. The third hole 12 is closer to the second end 7 than the first end 4.

  The third hole 12 in FIG. 3 extends across the fluid channel 11, thereby defining an intermediate outlet 16 and an intermediate inlet 17 of the fluid channel 11, both of which are the third outlet 16 and the intermediate inlet 17. Facing the hole 12. The connecting rod 3 further comprises a connecting element 18 having a bore 19 and arranged in the third hole 12 for fluidly connecting the intermediate outlet 16 and the intermediate inlet 17. The bore 19 forms part of the fluid channel 11. The connecting element 18 comprises a tubular part 20 that extends into the intermediate inlet 17 and fluidly connects the bore 19 in the tubular part 20 with the fluid channel 11. When the connecting rod 3 transmits a force from the crosshead 6 to the crankpin 9, a small deformation of the third hole 12 occurs and the tubular part 20 slides into the intermediate inlet 17, thereby absorbing this deformation. . The connecting element 18 is fastened to the rod part 10 by means of screws or bolts 25, for example. The connecting element 18 comprises a base portion 26, the tubular portion 20 and the bolt 25 extending into the base portion 26. Accordingly, the connecting element 18 is configured to absorb the deformation of the third hole 12 of the connecting rod 3 along the axial extension line L.

  The connecting element 18 in FIG. 4 comprises a first part 21 comprising the first section 22 of the bore 19 and a second part 23 comprising the second section 24 of the bore 19. The first part 21 of the connecting element 18 is slidable relative to the second part 23 of the connecting element 18 and fluidly connects the first section 22 and the second section 24 of the bore 19. The first portion 21 includes a tubular portion 20 that extends into the second section 24 of the bore 19 and slides within the second section 24 and thus extends axially. It is a male part that absorbs deformation of the third hole 12 of the connecting rod 3 along the line L. The connecting rod 3 has a radial clearance of 0.05 mm to 1.0 mm between the tubular portion 20 and the second portion 23, thereby absorbing the deformation of the third hole 12. The first portion 21 and the second portion 23 are fastened to the rod portion 10 by screws or bolts 25, for example. The first portion 21 includes a base portion 26A, and the tubular portion 20 and the bolt 25 extend into the base portion 26A. The second portion 23 also includes a base portion 26 </ b> B having a second section 24 of the bore 19.

The connecting rod 3 in FIGS. 3 and 4 has a first projecting portion 27 and a second projecting portion 28 that extend into the third hole 12 along the axial extension line L. The first protruding portion 27 forms the intermediate outlet 16, and the second protruding portion 28 forms the intermediate inlet 17. Therefore, the third hole is substantially H-shaped. In FIG. 3, the fluid channel 11 has a diameter D ₁ , D ₂ , the diameter from a first diameter D _{1 at} the first hole 5 to a second diameter D _{2 at} the second hole 8. is decreasing. A bearing ring 29 is disposed in the second hole 8 and the outlet 30 of the fluid channel 11 is adjacent to the bearing ring 29.

In FIG. 4, the fluid channel 11 has a first diameter D _{1 up} to the second hole 8, where the lubricating fluid is around the second hole 8 as shown in FIG. 5. Along the peripheral channel 36, so that the fluid channel 11 terminates at two outlets 32.

  In FIG. 5, the connecting rod 3 is provided with an additional third hole 12 </ b> B, which is closer to the first end 4 than to the second end 7. The connecting element 18 comprises a tubular part 20 extending into the intermediate inlet 17, and the fluid channel 11 is arranged along two holes 8 at two predetermined circumferential distances from the axial extension L. Terminate at exit 32.

  The first end 4 of the connecting rod 3 in FIGS. 1 to 7 has a crosshead part 33 connected to the rod part 10, thereby forming a first hole 5. In the same manner, the second end 7 of the connecting rod 3 comprises a crankpin part 34 connected to the rod part 10, thereby forming a second hole 8.

  The connecting rod 3 in FIG. 6 comprises an initial third hole 12, 12 A and an additional third hole 12, 12 B, arranged on opposite sides of the fluid channel 11, so that the two third holes The holes 12, 12 </ b> A, 12 </ b> B are disposed on both sides of the fluid channel 11. Therefore, the rod portion 10 is formed more flexible above the second hole 8 in order to make the force applied to the crankpin 9 uniform.

  In FIG. 7, the tubular portion 20 extends partially through the rod portion 10 in the fluid channel 11, so that the tubular portion 20 passes from the first hole 5 through the third hole 12. It extends to the second hole 8. There may be a clearance between the tubular portion 20 and the first hole 5 and / or the second hole 8. Tubular portion 20 extends into intermediate outlet 16 and intermediate inlet 17 and slides within fluid channel 11 to absorb deformation of third hole 12. The tubular portion may be a flexible tube in another embodiment.

  While the invention has been described above with reference to preferred embodiments of the invention, those skilled in the art will envision certain modifications without departing from the invention as defined by the following claims. Obviously it is possible.

DESCRIPTION OF SYMBOLS 1 2 stroke internal combustion engine with a large turbocharger, 2 Lubrication supply part, 3 Connecting rod, 4 1st end part, 5 1st hole, 6 Crosshead, 7 2nd end part, 8 2nd hole, 9 Crankpin, 10 Rod part, 11 Fluid channel, 12 3rd hole, 13 Central part, 14 1st bearing, 15 2nd bearing, 16 Intermediate outlet, 17 Intermediate inlet, 18 Connecting element, 19 Bore, 20 Tube , 21 1st part, 22 1st section, 23 2nd part, 24 2nd section, 27 1st protruding part, 28 2nd protruding part, L axial extension line

Claims (10)

A cross-head type two-stroke internal combustion engine (1) with a large turbocharger,
-A lubrication fluid lubrication supply (2);
A first end (4) having a first hole (5) configured to be connected to the crosshead (6) via a first bearing (14); and a second bearing (15 ) Via a second end (7) having a second hole (8) configured to be connected to the crankpin (9), the first hole (5) and the second hole At least one connecting rod (3) comprising a rod portion (10) between the hole (8), said connecting rod (3) having an axial extension (L), said connecting rod A connecting rod (3), wherein the rod (3) further comprises a fluid channel (11) configured to supply the lubricating fluid to at least one of the first hole (5) and the second hole (8). 3) and
In a two-stroke internal combustion engine (1) with a crosshead type large turbocharger comprising:
The connecting rod (3) includes a central portion (13) and a third hole (12), and the third hole (12) is located closer to the first bearing and the second bearing than the central portion. A through hole located in the rod portion (10) near one of the two, the third hole (12) changing the rigidity of the connecting rod (3) at least in the axial extension line (L) A two-stroke internal combustion engine (1) with a large cross-head type turbocharger, characterized in that   The crosshead type large turbocharged two-stroke internal combustion engine (1) according to claim 1, wherein the third hole (12) extends perpendicularly to the axial extension line (L). 1).   The crosshead type large turbocharger according to claim 1 or 2, characterized in that the fluid channel (11) extends from the first hole (5) to the second hole (8). A two-stroke internal combustion engine with a charger (1).   The third hole (12) extends across the fluid channel (11), thereby defining an intermediate outlet (16) and an intermediate inlet (17) of the fluid channel (11); The crosshead type large size according to any one of claims 1 to 3, wherein both the outlet (16) and the intermediate inlet (17) face the third hole (12). 2-stroke internal combustion engine with turbocharger (1).   A connecting rod (3) having a bore (19) and disposed in the third hole (12) for fluidly connecting the intermediate outlet (16) and the intermediate inlet (17) The two-stroke internal combustion engine (1) with a crosshead type large turbocharger according to claim 4, further comprising an element (18).   The two-stroke with crosshead type large turbocharger according to claim 5, characterized in that the connecting element (18) comprises a tubular part (20) extending into the intermediate inlet (17). Internal combustion engine (1).   The connecting element (18) comprises a first part (21) comprising a first section (22) of the bore and a second part (23) comprising a second section (24) of the bore; The first part (21) is slidable relative to the second part (23), the first section (22) and the second section (24) of the bore The two-stroke internal combustion engine (1) with a crosshead type large turbocharger according to claim 5 or 6, characterized by being fluidly connected.   8. The device according to claim 5, wherein the connecting element is configured to absorb deformation of the third hole along the axial extension line. A two-stroke internal combustion engine (1) with a large turbocharger of the crosshead type according to one item.   The first part (21) of the connecting element (18) slides partly within the second part (23) of the connecting element (18). A two-stroke internal combustion engine (1) with a large turbocharger of the crosshead type according to any one of the items.   A first protruding portion (27) and a second protruding portion (28), wherein the connecting rod (3) extends into the third hole (12) along the axial extension line (L). The first projecting portion (27) forms the intermediate outlet (16), and the second projecting portion (28) forms the intermediate inlet (17). A two-stroke internal combustion engine (1) with a crosshead type large turbocharger according to any one of claims 4 to 9.

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