JP5713628B2 - Frame - Google Patents

Description

  The present invention relates to a frame constituting a large diesel engine for ships.

  As a frame constituting a large diesel engine for marine use, for example, one disclosed in Patent Document 1 is known.

JP 2001-289114 A

Further, as a structure constituting a large diesel engine for marine use, the structure shown in FIG. 5 is also known. A frame 31 shown in FIG. 5 has a central partition plate 11 that partitions cylinders, a cam-side partition 12 (see FIG. 2) and an exhaust-side partition 13 (see FIG. 2) disposed on both sides thereof. . The horizontal thrust force received from the cross head 4 (see FIG. 1) is transmitted from the central partition plate 11 to the partition walls 12 and 13 through the guide bar (sliding plate) 14. The central partition plate 11 and the guide bar 14, the guide bar 14 and the top plate 15, and the guide bar 14 and the top plate 16 are joined by welding. The partition walls 12 and 13 and the guide bar 14 serve as members that suppress deformation due to a load such as an in-cylinder pressure and a thrust load acting on the frame 31. The top plate 15 above the partition wall 12 and the top plate 16 above the partition wall 13 are each provided with 14 tie bolt holes 17 through which the tie bolts 10 (see FIG. 1) pass (see FIG. 2).
In FIG. 5, the same members as those in the embodiments described later are denoted by the same reference numerals as those in the embodiments described later.

Then, as shown in FIG. 5, in the vicinity of the (welded) joint portion between the guide bar 14 and the top plate 15 and in the vicinity of the joint portion between the guide bar 14 and the top plate 16, that is, in the vicinity of the tie bolt hole 17. The plates 15 and 16 are respectively provided with rounded portions 32 having a radius R1. The rounded portion 32 protrudes from the inside of the top plates 15 and 16 toward the opposing top plates 16 and 15, and the side surface 19a of the protruding portion (tongue piece portion) 19 to which the outer side surface 14a of the guide bar 14 is joined. The starting point is located on the same plane as the side surface 14 b of the guide bar 14, and the outer side of the top plates 15, 16 (outer side surfaces 15 b, 16 b) and the direction away from the tie bolt hole 17 without approaching the tie bolt hole 17. After a quarter arc is drawn, the end points are formed on the same plane as the inner side surfaces 15a, 16a of the top plates 15, 16.
The side surface 14b of one guide bar 14 and the side surface 19a of the protruding portion 19, the side surface 14b of the other guide bar 14 and the side surface 19a of the protruding portion 19, and the surface 11a of the central partition plate 11 are parallel to each other. The outer surface 14a of the guide bar 14, the inner surface 14c of the guide bar 14, the inner surfaces 15a and 16a of the top plates 15 and 16, and the outer surfaces 15b and 16b of the top plates 15 and 16 are parallel to each other. ing.

  However, in the case having the rounded portion 32 as shown in FIG. 5, the rounded portion 32, the joint between the guide bar 14 and the top plate 15 (more specifically, the protruding portion 19 of the top plate 15), the guide bar 14 and the top. Stress concentrates on the joint with the plate 16 (more specifically, the projecting portion 19 of the top plate 16), and there is a possibility that a crack may occur in the round portion 32 and these joints.

  Therefore, as shown in FIG. 6, the radius of the rounded portion 42 is set to R2 larger than R1, and the rounded portion 42, the joint between the guide bar 14 and the top plate 15, and the joint between the guide bar 14 and the top plate 16 are used. A frame 41 that attempts to reduce concentrated stress is also considered, but in such a frame 41, the outer diameter width of the top plate (the distance between the outer surface 15b of the top plate 15 and the outer surface 16b of the top plate 16). L becomes larger than the frame 31, which is not preferable from the viewpoint of reducing the size and weight of the diesel engine.

  The present invention has been made in view of the above circumstances, and concentrates on the top plate located in the vicinity of the tie bolt hole and the joint between the guide bar and the top plate without causing an increase in size and weight of the diesel engine. It is an object of the present invention to provide a frame that can reduce the stress to be generated and can prevent the top plate and the joint from cracking.

The present invention employs the following means in order to solve the above problems.
Frames according to the present invention includes a central partition plate for partitioning between the cylinders, and its arrangement on either side are cam side partition wall and an exhaust side of the partition wall, of the central partition plate and the cam side of the partition wall and the exhaust side of the partition wall while being disposed in each of the upper, a Frame with a pair of ceiling plate protrusion protruding inwardly at a location that will be formed in the tie-bolts holes are formed, the cutouts at both ends of the protrusion The notch portion draws a ¼ arc from the starting point located on the side surface of the projecting portion toward the outside of the top plate and away from the tie bolt hole without approaching the tie bolt hole. After that, a quarter arc is drawn toward the inner side of the top plate and the direction away from the tie bolt hole to reach the end point located on the inner side surface of the top plate .

Frames according to the present invention includes a central partition plate for partitioning between the cylinders, and its arrangement on either side are cam side partition wall and an exhaust side of the partition wall, of the central partition plate and the cam side of the partition wall and the exhaust side of the partition wall while being disposed in each of the upper, a Frame with a pair of ceiling plate protrusion protruding inwardly at a location that will be formed in the tie-bolts holes are formed, the cutouts at both ends of the protrusion is provided with the cutout, of the top plate after had draw a quarter of a circle towards the outside of the from the start point located at the side surface of the projecting portion so as to approach the said tie-bolt holes the top plate inner surfaces of the outer and the tie bolt-out drawing a quarter of a circle towards away from the hole, the top plate further draw a quarter of a circle towards away from the inside and the tie bolt hole of the top plate To the end point located at It is sea urchin formation.

  According to the frame according to the present invention, since the top plate located in the vicinity of the tie bolt hole has a flexible structure by providing the notch portion, the top plate located in the vicinity of the tie bolt hole, and the joining of the guide bar and the top plate The stress concentrated on the portion can be reduced (dispersed along the notch), and cracks can be prevented from occurring on the top plate and the joint.

  The diesel engine according to the present invention includes any one of the above frames.

  According to the diesel engine according to the present invention, it is possible to reduce the stress concentrated on the joint between the top plate located in the vicinity of the tie bolt hole and the guide bar and the top plate (distributed along the notch), A frame that can prevent the top plate and the joint from cracking is provided, whereby the reliability of the diesel engine can be improved.

  According to the frame of the present invention, the stress concentrated on the top plate located in the vicinity of the tie bolt hole and the joint between the guide bar and the top plate can be reduced without increasing the size and weight of the diesel engine. This produces an effect that it is possible to prevent the top plate and the joint from being cracked.

It is a longitudinal cross-sectional view which shows the structural example of the large sized diesel engines for ships etc. which comprised the frame which concerns on this invention. It is a perspective view of the frame concerning a 1st embodiment of the present invention. It is the top view which expanded and showed the principal part of FIG. It is the top view which expanded and showed the principal part of the frame concerning 2nd Embodiment of this invention. It is the top view which expanded and showed the principal part of the conventional frame. FIG. 5 is an enlarged plan view showing the main part of the frame shown in FIG. 5 that is designed to reduce stress concentrated on the top plate located near the tie bolt hole and the joint between the guide bar and the top plate. FIG.

  Hereinafter, a frame according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view showing a structural example of a marine diesel engine equipped with a frame according to the present invention, FIG. 2 is a perspective view of the frame according to the present embodiment, and FIG. 3 is an enlarged view of the main part of FIG. It is the top view shown.

As shown in FIG. 1, a large diesel engine (crosshead type diesel engine) E is roughly divided into three parts. The first is a jacket that houses the cylinder 2 and the piston 3, etc. The second is the frame 6 that houses the connecting rod 7 that conducts the force generated by the explosion of the piston 3 to the crankshaft 8, and the third is obtained. A base plate 9 that houses a crankshaft 8 that transmits power to a propeller or the like. The base plate 9, the frame 6, and the jacket 1 are sequentially stacked and assembled by tightening with a tie bolt 10 that vertically penetrates the entire engine from the upper surface of the jacket 1 to the bottom surface of the base plate 9.
In FIG. 1, reference numeral 5 denotes a guide bar (sliding plate) along which the cross head 4 moves up and down.

As shown in FIG. 2, the frame 6 includes a central partition plate 11 that partitions cylinders, a cam-side partition wall 12 and an exhaust-side partition wall 13 disposed on both sides thereof. The horizontal thrust force received from the cross head 4 is transmitted from the central partition plate 11 to the partition walls 12 and 13 through a guide bar (sliding plate) 14. The central partition plate 11 and the guide bar 14, the guide bar 14 and the top plate 15, and the guide bar 14 and the top plate 16 are joined by welding. The partition walls 12 and 13 and the guide bar 14 serve as members that suppress deformation due to a load such as an in-cylinder pressure and a thrust load acting on the frame 6. The top plate 15 above the partition wall 12 and the top plate 16 above the partition wall 13 are each provided with 14 tie bolt holes 17 through which the tie bolts 10 (see FIG. 1) pass.
Note that the frame 6 configured in this way receives the cylinder cylinder pressure and the side thrust force from the cross head 4. Therefore, high stress tends to be generated near the upper and lower ends of the central partition plate 11.

Further, as shown in FIG. 3, in the vicinity of the (welded) joint portion between the guide bar 14 and the top plate 15 and in the vicinity of the joint portion between the guide bar 14 and the top plate 16, that is, in the vicinity of the tie bolt hole 17. Each of the plates 15 and 16 is provided with a notch 18 having a semicircular shape in plan view. The notch 18 protrudes from the inside of the top plates 15, 16 toward the opposing top plates 16, 15, and the side surface 19 a of the projection (tongue piece) 19 to which the outer side surface 14 a of the guide bar 14 is joined. The starting point is located on the same plane as the side surface 14 b of the guide bar 14, and the outer side of the top plates 15, 16 (outer side surfaces 15 b, 16 b) and the direction away from the tie bolt hole 17 without approaching the tie bolt hole 17. A quarter arc is drawn toward the inside of the top plates 15, 16 (inner side surfaces 15 a, 16 a) and a direction away from the tie bolt hole 17. After drawing a 1/4 arc toward the inner side (the inner side surfaces 15a, 16a) and the direction away from the tie bolt hole 17, the end point is on the same plane as the inner side surfaces 15a, 16a of the top plates 15, 16 position It is formed in so that.
The side surface 14b of one guide bar 14 and the side surface 19a of the protruding portion 19, the side surface 14b of the other guide bar 14 and the side surface 19a of the protruding portion 19, and the surface 11a of the central partition plate 11 are parallel to each other. The outer surface 14a of the guide bar 14, the inner surface 14c of the guide bar 14, the inner surfaces 15a and 16a of the top plates 15 and 16, and the outer surfaces 15b and 16b of the top plates 15 and 16 are parallel to each other. ing.

  According to the frame 6 according to the present embodiment, the top plate 15, 16 located in the vicinity of the tie bolt hole 17 becomes a flexible structure by providing the notch portion 18, so the top plate 15, located in the vicinity of the tie bolt hole 17, 16 and the stress concentrated on the joint between the guide bar 14 and the top plates 15 and 16 can be reduced (distributed along the notches 18), and cracks are generated in the top plates 15 and 16 and the joints. Can be prevented.

A second embodiment of a frame according to the present invention will be described with reference to FIG. FIG. 4 is an enlarged plan view showing the main part of the frame according to this embodiment.
The frame 21 according to the present embodiment is different from that of the first embodiment described above in that a cutout portion 22 is provided instead of the cutout portion 18. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  As shown in FIG. 4, the notch 22 protrudes from the inside of the top plates 15, 16 toward the opposing top plates 16, 15, and a protruding portion (tongue piece) to which the outer surface 14 a of the guide bar 14 is joined. Portion) 19 and the side surface 14b of the guide bar 14 are flush with the tie bolt hole 17 so that the starting point is located on the same plane as the side surface 19a and the side surface 14b of the guide bar 14 (outside surfaces 15b and 16b). A quarter arc is drawn toward the top, and a quarter arc is drawn toward the outside of the top plates 15 and 16 (outside surfaces 15b and 16b) and away from the tie bolt holes 17, and the top plates 15 and 16 are drawn. After drawing a ¼ arc toward the inner side (inner side surfaces 15a, 16a) and away from the tie bolt hole 17, toward the inner side (inner side surfaces 15a, 16a) of the top plates 15, 16 Side 14 of the guide bar 14 A straight line parallel to the side surface 19a of the projecting portion 19 and the surface 11a of the central partition plate 11 is drawn so that the end point is located on the same plane as the inner side surfaces 15a and 16a of the top plates 15 and 16. ing.

  According to the frame 21 according to this embodiment, the shortest distance between the tie bolt hole 17 and the notch 22 is shorter than the notch 18 of the first embodiment, and the length of the curved portion of the notch 22 is the first. Since it becomes longer than the notch part 18 of 1st Embodiment, the stress concentrated on the top plate 15 and 16 located in the vicinity of the tie-bolt hole 17 and the junction part of the guide bar 14 and the top plate 15 and 16 is 1st Embodiment. Can be reduced (dispersed along the notch 22), and cracks can be prevented from occurring in the top plates 15, 16 and the joint.

  The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the gist of the present invention.

6 frame 11 central partition plate 12 partition wall 13 partition wall 15 top plate 16 top plate 17 tie bolt hole 18 notch 21 frame 22 notch 31 frame 41 frame E diesel engine

Claims (5)

A central partition that partitions the cylinders;
A cam-side partition and an exhaust-side partition disposed on both sides thereof;
While it is disposed in each of an upper side of the central partition plate and the cam side of the partition wall and said exhaust-side partition wall, a pair of top plate protruding portion formed to protrude inwardly at a position that will be formed in the tie-bolt holes ,
A frame with
Notches are provided at both ends of the protrusion ,
The notch is of the top plate of the outer and quarter of a circle towards away from the tie bolt hole of the top plate without approaching from the start point located at the side surface of the projecting portion in the tie-bolt holes after had draw A frame characterized by forming a ¼ arc toward the inner side and the direction away from the tie bolt hole so as to reach an end point located on the inner side surface of the top plate . A central partition that partitions the cylinders;
A cam-side partition and an exhaust-side partition disposed on both sides thereof;
While it is disposed in each of an upper side of the central partition plate and the cam side of the partition wall and said exhaust-side partition wall, a pair of top plate protruding portion formed to protrude inwardly at a position that will be formed in the tie-bolt holes ,
A frame with
Notches are provided at both ends of the protrusion ,
The cut portion is outside and the tie bolt hole of the top plate after had draw a quarter of a circle towards the outside of the from the start point located at the side surface of the projecting portion so as to approach the said tie-bolt holes the top plate -out drawing a quarter arc towards away from reaching the end point further located on the inner surface of the inner and draw a quarter of a circle towards away from the tie bolt hole the top plate of the top plate A frame characterized by being formed as follows . A central partition that partitions the cylinders;
A cam-side partition and an exhaust-side partition disposed on both sides thereof;
The frame is arranged on the upper side of the central partition plate and the partition wall, and has a top plate on which tie bolt holes are formed,
The top plate located in the vicinity of the tie bolt hole is a position where the tie bolt hole is provided in the direction in which the central partition plate extends, and the side surface of the sliding plate joined to each of the central finishing plate and the top plate; from the inside and the tie bolt hole of the top plate after had draw a quarter of a circle towards away from the outer and the tie bolt hole of the top plate without approaching the tie bolts hole positions on the same plane as the starting point A frame comprising a notch extending in a ¼ arc toward the far side. A central partition that partitions the cylinders;
A cam-side partition and an exhaust-side partition disposed on both sides thereof;
The frame is arranged on the upper side of the central partition plate and the partition wall, and has a top plate on which tie bolt holes are formed,
The top plate located in the vicinity of the tie bolt hole is provided with a notch that draws an arc centered on the position where the tie bolt hole is provided in the direction in which the central partition plate extends,
The notch is located on the inner side of the top plate with respect to the center in the direction in which the central partition plate extends, and is flush with the side surface of the sliding plate joined to each of the central finishing plate and the top plate. A quarter arc is drawn outward from the top plate so as to approach the tie bolt hole starting from the upper position, and a quarter arc toward the outside of the top plate and away from the tie bolt hole. painted, characterized by the Turkey extending draw a quarter arc towards away from the inside and the tie bolt hole of the top plate Frame. A diesel engine comprising the frame according to any one of claims 1 to 4 .

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