JP6030897B2 - Jack bolt and engine equipped with the same - Google Patents

Description

  The present invention relates to a jack bolt and an engine including the same.

  Conventionally, when installing vibration-isolated equipment such as engines and generators on the installation surface such as the floor of the hull, the vibration-isolated equipment is placed on the platform floor (common platform floor). An anti-vibration structure having an anti-vibration member interposed therebetween is known. For example, as described in Patent Document 1.

  In the vibration isolating structure as described in Patent Document 1, the vibration isolating member is often realized by an elastic body or the like, and deterioration such as a decrease in elastic force may occur with use. And if a vibration isolator deteriorates, since the vibration with respect to the installation surface of a to-be-vibrated apparatus will become large, the necessity to replace | exchange this arises. Therefore, the anti-vibration structure as described in Patent Document 1 is provided with jack bolts for jacking up the platform with respect to the installation surface when the anti-vibration member is replaced. The jack bolt is screwed into a screw hole provided in the bed so that the screwing amount can be adjusted, and the tip of the screw portion can abut on the installation surface.

  By the way, the jack bolt is often used as a substitute for a stopper for suppressing the displacement of the platform with respect to the installation surface while the jack up operation is not performed. That is, when the hull or the like is shaken, the tip portion of the screw portion of the jack bolt abuts on the installation surface, so that excessive deformation of the vibration isolating member is suppressed and displacement of the base floor with respect to the installation surface is suppressed. It is.

JP 2006-341742 A

  However, when the hull or the like shakes violently, the tip of the jack bolt's screw part violently collides with the installation surface, applying a large stress to the jack bolt, causing the screw part of the jack bolt to buckle or damage the thread. As a result, the screw hole may not be removed.

  In consideration of the above, an object of the present invention is to prevent buckling of a screw portion of a jack bolt and damage to a screw thread.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In Claim 1, the vibration proof member was interposed between the base floor and the floor surface, and the jack bolt provided with the function which jacks up the base floor with respect to a floor surface was provided in the base floor. A screw portion that is screwed into the screw hole so that the screwing amount thereof can be adjusted, and a stopper portion that is provided at a lower end of the screw portion and has a diameter increased with respect to the screw portion, and the screwing amount of the screw portion is When the predetermined amount is reached, the stopper portion comes into contact with the floor surface, so that the vibration isolating member can be replaced. When the screwing amount of the screw portion is less than the predetermined amount, the base floor is The stopper member comes into contact with the floor surface when tilted with respect to the floor surface, and limits an allowable range of displacement in the vertical direction with respect to the floor surface of the platform floor.

  In Claim 2, The jack bolt of Claim 1 WHEREIN: The said jack bolt has an operation part, a screw part, and a stopper part in an order from the top, The said operation part is on the upper end of a screw part. An operating portion that is provided and is reduced in diameter relative to the screw portion and rotates the jack bolt in the circumferential direction. A stepped surface is formed on the upper surface of the stopper portion, and the stepped surface contacts the lower surface of the platform. It is comprised as follows.

  In Claim 3, The jack bolt of Claim 1 or Claim 2 WHEREIN: The vertical length of the thread part of the said jack bolt is the vertical length of the screw hole of the said platform, and the vertical length of the said stopper member. The dimensions are set shorter than those obtained by adding together.

  In Claim 4, it is an engine provided with the jack bolt as described in any one of Claim 1- Claim 3.

  As effects of the present invention, the following effects can be obtained.

  In the first aspect, when the jack-up operation is not performed, the stopper member can be screwed onto the screw portion of the jack bolt. In this way, the stopper member can be easily retrofitted to an existing jack bolt. When the stopper is tilted by screwing the stopper member, the stopper member comes into contact with the stopper member to receive pressure. The force applied to the stopper member is transmitted to the platform through the screw portion of the jack bolt and the upper surface of the stopper member. Therefore, compared with the case where it is set as the structure which does not provide a stopper member, the stress which a jack bolt bears is reduced. Therefore, it is possible to prevent the buckling of the jack bolt and the damage of the screw thread.

  According to the second aspect of the present invention, when the base floor is tilted, the stopper portion of the jack bolt comes into contact with the installation surface so that the stopper portion receives pressure. The force applied to the stopper part is transmitted to the platform through the screw part of the jack bolt. Therefore, compared with the case where it is set as the structure which does not provide a stopper part, the stress which the thread part of a jackbolt bears is reduced. Therefore, it is possible to prevent buckling of the screw portion of the jack bolt and damage to the screw thread.

  According to the third aspect, when the jack bolt and the stopper member are mounted, there is no possibility that the lower end of the screw portion of the jack bolt protrudes downward (on the installation surface side) from the stopper member, and an assembly error can be prevented.

  In Claim 4, when the hull etc. which installs the engine which is a to-be-vibrated apparatus shakes violently, a stopper member and an installation surface contact | abut, A stepped surface or a stopper member simultaneously with the screw part of a jack bolt Share the stress. Therefore, compared with the case where it is set as the structure which does not provide a stopper part or a stopper member, the stress which the thread part of a jack bolt bears is reduced. Therefore, it is possible to prevent buckling of the screw portion of the jack bolt and damage to the screw thread.

It is a figure which shows the hull carrying the engine provided with the jack bolt which concerns on this invention. It is a figure which shows the engine which concerns on one Embodiment of this invention. An enlarged cross-sectional view of a portion including jack bolts is shown in a portion surrounded by an ellipse of a two-dot chain line in the figure. It is a figure which shows the state in which the to-be-vibrated apparatus is mounted in the basement. (A) It is a figure which shows the jack bolt which concerns on 1st embodiment. (B) It is a figure which shows a state when jack-up operation is performed using the jack bolt which concerns on 1st embodiment. It is a figure which shows a state when the jack bolt which concerns on 1st embodiment is functioning as a stopper for suppressing the displacement with respect to the installation surface of a base floor. (A) It is a figure which shows the stopper member screwed by the jack bolt which concerns on 2nd embodiment, and the said jack bolt. (B) It is a figure which shows a state when the stopper member screwed by the jack bolt which concerns on 2nd embodiment is loosened. (A) It is a figure which shows a state when jack-up operation is performed using the jack bolt which concerns on 2nd embodiment. (B) It is a figure which shows a state when the stopper member which concerns on 2nd embodiment is functioning as a stopper for suppressing the displacement with respect to the installation surface of a platform. (A) It is a side view which shows another Example of the jack bolt which concerns on 2nd embodiment. (B) It is a side view which shows another Example of the jack bolt which concerns on 2nd embodiment. (A) It is a top view of a spacer. (B) It is a top view of the spacer which concerns on another Example. (C) It is a side view which shows another Example of the jack bolt which concerns on 2nd embodiment. (A) It is a figure which shows the stopper member screwed by the jack bolt which concerns on 3rd embodiment, and the said jack bolt. (B) It is a figure which shows a state when jack-up operation is performed using the jack bolt which concerns on 3rd embodiment. It is a figure which shows a state when the stopper member which concerns on 3rd embodiment is functioning as a stopper for suppressing the displacement with respect to the installation surface of a base floor. It is a figure which shows a stopper member, (a) is a top view, (b) is side sectional drawing, (c) is a bottom view. It is a figure which shows another Example of a stopper member, (a) is a top view, (b) is a side view, (c) is a bottom view.

  Next, embodiments of the invention will be described.

  The engine 1 shown in FIG.1 and FIG.2 is one Embodiment of the engine which concerns on this invention. The engine 1 according to the present embodiment is a marine engine and is mounted on a hull 7. However, the engine 1 is not limited to a marine engine, and may be, for example, a combine engine instead.

  As shown in FIG.1 and FIG.3, the engine 1 which concerns on this invention is mounted in the platform 3 which is a common platform with the generator 2. As shown in FIG. The engine 1 includes an engine body 8 mainly composed of a cylinder block, a crankshaft 6 (output shaft), a cylinder head 9 having a fuel injection nozzle for pumping fuel, an oil pan 15 for storing lubricating oil, and the like. It is configured. The engine 1 is fixed to the platform 3 via a support flange 16. Specifically, the flange 16 is fixed to the floor 3 by using fastening means such as bolts, and the lower portion of the engine main body 8 is fixed to the flange 16 using fastening means such as bolts. However, the flange 16 may be formed integrally with the floor 3 or the engine body 8. The engine 1 according to the present embodiment is a so-called auxiliary machine that is provided to give power to the generator 2. The base floor 3 is installed on the floor surface 4 of the hull 7 which is an installation surface via a vibration isolation member 5. As shown in FIGS. 1 to 3, the vibration isolating member 5 in the present embodiment is composed of a vibration isolating rubber having attachment portions at both ends. However, the structure of the vibration isolating member is not limited to this. In FIG. 4 and subsequent figures, the vibration isolating member 5 is schematically shown. In FIG. 4 and subsequent figures, the jack bolt 10 and the vibration isolating member 5 viewed from the direction of the crankshaft 6 of the engine 1 are schematically shown. Here, the engine 1 and the generator 2 are one embodiment of the vibration-isolated device, but the vibration-isolated device is not limited to this, and for example, a control device or the like is further used as the vibration-isolated device. It is good also as a structure provided. Or it is good also as a structure by which only the engine 1 (structure which does not use the generator 2 as a vibration-insulated apparatus) is used as a vibration-insulated apparatus, and the engine 1 is mounted on the floor 3 alone. Further, the floor surface 4 of the hull 7 is an embodiment of the installation surface, but the installation surface is not limited to this. For example, the floor surface 4 of the combine engine room may be used instead. Good.

  The vibration isolation member 5 interposed between the pedestal 3 and the floor surface 4 of the hull 7 is made of an elastic body such as rubber. However, the vibration isolating member 5 may be composed of another known elastic body or the like. The vibration-proof member 5 is deteriorated such that the elastic force is lowered with use. When the vibration isolating member 5 deteriorates, vibrations of the engine 1 and the generator 2 with respect to the floor surface 4 of the hull 7 increase, so that it is necessary to replace them. Therefore, the engine 1 is provided with jack bolts 10 for jacking up the platform 3 with respect to the floor 4 of the hull 7 when the vibration isolator 5 is replaced. The jack bolt 10 is screwed into a screw hole 3 a provided in the floor 3 so that the screwing amount can be adjusted, and the lower end thereof can be brought into contact with the floor surface 4 of the hull 7. As will be described later in detail, the jack bolt 10 functions as a stopper for suppressing the displacement of the floor 3 relative to the floor surface 4 of the hull 7 while the jack-up operation is not performed.

<First embodiment>
Below, the jack bolt 10 which concerns on 1st embodiment of this invention is explained in full detail with reference to FIG.4 and FIG.5. As shown in FIG. 4A, the jack bolt 10 includes a screw portion 10a, a stopper portion 10b, and an operation portion 10c.

  The screw portion 10a is a shaft-like portion having a male screw formed on the outer peripheral surface thereof. This male screw corresponds to a female screw formed on the inner peripheral surface of the screw hole 3 a of the bed 3. In addition, the screw hole 3a of the base floor 3 may be provided directly in the base floor 3, or it is the structure provided in the base floor 3 via the said nut by attaching a nut to the said base floor 3. Also good. The screw portion 10a is screwed into a screw hole 3a provided in the platform 3 so that the screwing amount can be adjusted.

  The stopper portion 10b is a cylindrical portion provided at the lower end of the screw portion 10a. The stopper portion 10b is expanded in diameter relative to the screw portion 10a. More specifically, the axis of the stopper portion 10b is aligned with the axis of the screw portion 10a, and the radial dimension of the stopper portion 10b is larger than the radial dimension of the screw portion 10a. Accordingly, a stepped surface 10d is formed on the upper surface of the stopper portion 10b. The stepped surface 10d is set to have a sufficiently large area with respect to the radial dimension of the threaded portion 10a and to be one smooth plane.

  The operation portion 10c is a shaft-shaped portion having a regular hexagonal cross section provided at the upper end of the screw portion 10a. The operation portion 10c of the present embodiment is reduced in diameter with respect to the screw portion 10a. The operation part 10c is a part operated by the spanner or the like when the jack bolt 10 is rotated in the circumferential direction using a tool such as a spanner. However, the shape of the operation portion 10c is not limited to a regular hexagonal cross section, and may be one in which, for example, a pair of parallel surfaces are formed so that it can be operated by a spanner or the like. Good. Or it is good also as a structure which can rotate the jack bolt 10 with the said rod by providing a through-hole perpendicular | vertical to the axis line of the said screw part 10a in the upper end part of the screw part 10a, and inserting a stick | rod into the said through-hole from the side.

  The jack bolt 10 configured as described above is in a state where the stepped surface 10d is in contact with the lower surface 3b of the platform 3 as shown in FIG. 4A when the jack-up operation is not performed. As shown in FIG. At this time, the difference between the vertical length of the stopper portion 10b and the distance between the lower surface 3b of the bed 3 and the floor 4 of the hull 7 is the vertical displacement of the bed 3 relative to the floor 4 of the hull 7. This is an acceptable range. Therefore, by setting the vertical length of the stopper portion 10b to an appropriate length, it is possible to appropriately change the allowable range of the vertical displacement.

  And when performing jackup operation, an operator applies a spanner etc. to the operation part 10c, rotates the jack bolt 10 to the circumferential direction, and increases the screwing amount of the said jack bolt 10. FIG. That is, the protrusion amount of the screw part 10a to the lower side of the bed 3 is increased. When the protruding amount of the threaded portion 10a downward from the platform floor 3 reaches a predetermined amount, the lower surface of the stopper portion 10b comes into contact with the floor surface 4 of the hull 7. When the jack bolt 10 is screwed further downward in this state, the distance between the floor surface 4 of the hull 7 and the base floor 3 increases, and the base floor 3 is jacked up with respect to the floor surface 4 of the hull 7. (See FIG. 4 (b)). By doing so, the vibration isolating member 5 can be replaced.

  On the other hand, when the base 7 including the engine 1 and the like is tilted when the hull 7 is shaken violently when the jack-up operation is not performed, as shown in FIG. 5, the stopper portion 10b of the jack bolt 10 and the hull 7 is in contact with the floor surface 4. At this time, since the stepped surface 10d is in contact with the lower surface 3b of the platform 3, the force is transmitted through the stepped surface 10d (see the arrow in FIG. 5). Therefore, compared with the case where it is set as the structure which does not provide the stopper part 10b, the stress which the thread part 10a of the jack bolt 10 bears is reduced. Therefore, it is possible to prevent buckling of the screw portion 10a of the jack bolt 10 and damage to the thread.

  As described above, the jack bolt 10 according to the present embodiment includes the vibration isolating member 5 interposed between the floor 3 on which the engine 1 and the generator 2 are placed and the floor surface 4 of the hull 7. This is a jack bolt 10 for jacking up the pedestal 3 with respect to the floor 4 of the hull 7 when exchanging. And the said jack bolt 10 is provided in the screw part 3a screwed in the screw hole 3a provided in the base floor 3 so that the screwing amount can be adjusted, and the lower end of the said screw part 10a, And a stepped surface 10d is formed on the upper surface of the stopper portion 10b. When the jack-up operation is not performed, the stepped surface 10d is the lower surface of the platform 3 It is in a state of being in contact with 3b.

  With this configuration, when the platform 3 including the engine 1 and the like is tilted, the stopper portion 10b of the jack bolt 10 and the floor surface 4 of the hull 7 come into contact with each other, and the force is transmitted through the stepped surface 10d. . Therefore, compared with the case where it is set as the structure which does not provide the stopper part 10b, the stress which the thread part 10a of the jack bolt 10 bears is reduced. Therefore, it is possible to prevent buckling of the screw portion 10a of the jack bolt 10 and damage to the thread.

<Second embodiment>
Below, the jack bolt 20 which concerns on 2nd embodiment of this invention is explained in full detail with reference to FIG.6 and FIG.7. The jack bolt 20 has a screw part 20a and an operation part 20c. A stopper member 21 is screwed onto the screw portion 20a of the jack bolt 20.

  The screw portion 20a is a shaft-like portion having a male screw formed on the outer peripheral surface thereof. This male screw corresponds to a female screw formed on the inner peripheral surface of the screw hole 3 a of the bed 3. The screw portion 3a is screwed into a screw hole 3a provided in the platform 3 so that the screwing amount can be adjusted.

  The operation portion 20c is a shaft-shaped portion having a regular hexagonal cross section provided at the upper end of the screw portion 20a. The operation portion 20c of the present embodiment has a larger diameter than the screw portion 20a. The operation portion 20c is a portion that is operated by the spanner or the like when the jack bolt 20 is rotated in the circumferential direction using a tool such as a spanner.

  The stopper member 21 shown in FIGS. 6, 7, and 12 is a substantially cylindrical member, and the screw hole 21 a passes through the central shaft portion. The female screw formed on the inner peripheral surface of the screw hole 21 a corresponds to the male screw of the screw part 20 a of the jack bolt 20. Therefore, the stopper member 21 can be attached and detached (screwed) to the threaded portion 20 a of the jack bolt 20. The outer diameter of the stopper member 21 is sufficiently larger than the inner diameter of the screw hole 21a. The upper surface 21d of the stopper member 21 is one smooth flat surface. In the present embodiment, chamfered portions 21 b and 21 b are formed at the lower end portion of the stopper member 21. The chamfered portions 21b and 21b are a pair of parallel surfaces, and are for enabling the stopper member 21 to be operated by a tool such as a spanner.

  As shown in FIG. 6A, when the jack bolt 20 having the above-described configuration is not being jacked up, the screw portion 20a is placed on the base 3 with the operation portion 20c facing upward. It is screwed into the screw hole 3a. A stopper member 21 can be screwed onto the lower end portion of the screw portion 20a of the jack bolt 20. More specifically, the operator applies a spanner or the like to the chamfered portions 21b and 21b of the stopper member 21 while preventing the rotation of the jack bolt 20 in the circumferential direction by applying a spanner or the like to the operation portion 20c. The stopper member 21 is screwed into the threaded portion 20a of the jack bolt 20 by rotating in the circumferential direction. Then, the upper surface 21 d of the stopper member 21 is brought into contact with and in close contact with the lower surface 3 b of the bed 3. At this time, the screwing amount of the jack bolt 20 is also adjusted so that the lower end of the screw portion 20a does not protrude from the lower surface 21e of the stopper member 21. Here, the difference between the vertical length of the stopper member 21 and the distance between the lower surface 3 b of the bed 3 and the floor 4 of the hull 7 is the vertical displacement of the bed 3 relative to the floor 4 of the hull 7. This is an acceptable range. Therefore, by setting the vertical length of the stopper member 21 to an appropriate length, it is possible to appropriately change the allowable range of the vertical displacement.

  Then, when performing the jack-up operation, the operator applies a spanner or the like to the chamfered portions 21 b and 21 b of the stopper member 21, rotates the stopper member 21 in the circumferential direction, and the stopper member 21 is screwed to the screw portion 20 a of the jack bolt 20. Move downward with respect to. That is, the protrusion amount of the stopper member 21 from the lower end of the screw portion 20a is increased. When the amount of downward protrusion of the stopper member 21 reaches a predetermined amount, the lower surface 21e of the stopper member 21 contacts the floor surface 4 of the hull 7. If the stopper member 21 is further protruded downward in this state, the distance between the floor surface 4 of the hull 7 and the pedestal 3 increases, and the pedestal 3 is jacked up with respect to the floor surface 4 of the hull 7. (See FIG. 7A). By doing so, the vibration isolating member 5 can be replaced.

  On the other hand, if the floor surface 4 of the hull 7 is greatly inclined due to the swaying of the hull 7 or the like when the jack-up operation is not performed, the stopper member 21 and the floor surface 4 of the hull 7 come into contact with each other (FIG. 7). (See (b)). At this time, since the lower end of the screw portion 20a of the jack bolt 20 does not protrude from the lower surface 21e of the stopper member 21, no stress is directly applied to the jack bolt 20. At this time, the upper surface 21d of the stopper member 21 contacts and is in close contact with the lower surface 3b of the platform 3 so that the upper surface 21d of the stopper member 21 receives pressure (see the arrow in FIG. 7B). Therefore, compared with the case where it is set as the structure which does not provide the stopper member 21, the stress which the jack bolt 20 bears is reduced. Therefore, buckling of the jack bolt 20 and damage to the screw thread can be prevented.

  In the case of this embodiment, the stopper member 21 can be easily retrofitted to the existing jack bolt 20 that has been conventionally used, and the present invention can be realized at low cost.

  As described above, the jack bolt 20 according to the present embodiment includes the vibration isolating member 5 interposed between the floor 3 on which the engine 1 and the generator 2 are placed and the floor surface 4 of the hull 7. This is a jack bolt 20 for jacking up the pedestal 3 with respect to the floor 4 of the hull 7 when exchanging. The jack bolt 20 has a screw portion 20a that is screwed into a screw hole 3a provided in the bed 3 so that the screwing amount can be adjusted, and a stopper member 21 is detachably attached to the screw portion 20a. When the jack-up operation is not performed, the upper surface 21d of the stopper member 21 is in contact with the lower surface 3b of the platform 3 and the lower end of the screw portion 20a is the lower surface of the stopper member 21. 21e is not projected from 21e.

  With this configuration, the stopper member 21 can be screwed onto the screw portion 20a of the jack bolt 20 when the jack-up operation is not performed. In this manner, the stopper member 21 can be easily attached to the existing jack bolt 20 that has been conventionally used. Then, by screwing the stopper member 21, when the platform 3 including the engine 1 and the like is tilted, the stopper member 21 and the floor surface 4 of the hull 7 come into contact with each other and pass through the upper surface 21 d of the stopper member 21. Power is transmitted. Therefore, compared with the case where it is set as the structure which does not provide the stopper member 21, the stress which the jack bolt 20 bears is reduced. Therefore, buckling of the jack bolt 20 and damage to the screw thread can be prevented.

  In the present embodiment, the screw hole 21a is provided so as to penetrate the central shaft portion of the stopper member 21, but the present invention is not limited to this, and instead of the screw hole 21a. Further, a screw hole may be provided in which the lower surface 21e of the stopper member 21 is closed. In this case, when the stopper member 21 is screwed to the jack bolt 20, there is no possibility that the lower end of the screw portion 20 a of the jack bolt 20 protrudes downward (on the installation surface side) from the stopper member 21, thereby preventing an assembly error. it can.

  In the present embodiment, the upper surface 21d of the stopper member 21 is in direct contact with the lower surface 3b of the platform 3; however, the present invention is not limited to this, for example, instead of this, As shown in FIG. 8A, a spacer 22 is disposed between the stopper member 21 and the pedestal 3, and the upper surface 21 d of the stopper member 21 is indirectly connected to the lower surface 3 b of the pedestal 3 via the spacer 22. It is good also as a structure which has contact | abutted. In FIG. 8A showing a specific example, the spacer 22 is fitted to the screw portion 20 a of the jack bolt 20, the upper surface 22 a is the lower surface 3 b of the platform 3, and the lower surface 22 b is the stopper member 21. The upper surface 21d is in contact with and in close contact.

  Moreover, as shown in FIG.8 (b), it is good also as a structure by which the further spacer 23 is interposed between the operation part 20c of the jack volt | bolt 20 and the base floor 3. FIG. In FIG. 8B showing a specific example, the spacer 23 is fitted to the screw portion 20 a of the jack bolt 20, the upper surface 23 a is the lower surface of the operation portion 20 c, and the lower surface 23 b is the upper surface of the platform 3. 3c is in contact with and in close contact.

  The spacers 22 and 23 may have a shape in which holes 22c and 23c through which the screw portions 20a of the jack bolt 20 are inserted are formed in the center in plan view as shown in FIG. 9A. The cross-sectional shape (planar shape) having a notch 24a larger than the diameter of the screw portion 20a of the jack bolt 20 is not limited to this, for example, a spacer 24 shown in FIG. 9B. It may be included. When configured in this manner, the spacer 24 can be detached from the screw portion 20a without removing the jack bolt 20 from the screw hole 3a. Moreover, as shown in FIG.9 (c), it can be set as the structure which made spacers 25.25 ... thin, and was divided | segmented into several sheets. It is possible to adjust the screwing amount of the jack bolt 20 into the screw hole 3a and the vertical height of the stopper member 21 by changing the number of spacers 25, 25... Attached to the screw portion 20a. It becomes. Further, the planar shape of the spacers 22, 23, and 24 is not limited to the circular shape as shown in FIGS. 9A and 9B, but instead is a polygonal shape (for example, a rectangular shape). You may comprise.

  The lower end of the stopper member 21 (see FIG. 12) is formed with a pair of parallel chamfered portions 21b and 21b, but at least in order to be operable with a tool such as a spanner. What is necessary is just to have one set of parallel surfaces, for example, the cross section of the lower end part of the said stopper member 26 is good also as a regular hexagon shape like the stopper member 26 shown in FIG. Or it is good also considering a cross section as a polygonal shape over the whole area of the up-down direction of a stopper member.

  Further, when it is necessary to reduce the impact when the stopper members 21 and 26 collide with the floor surface 4 of the hull 7, rubber or a gel-like cushioning material or the like is attached to the bottom surfaces of the stopper members 21 and 26. It is desirable.

<Third embodiment>
Below, the jack bolt 30 which concerns on 3rd embodiment of this invention is explained in full detail with reference to FIG.10 and FIG.11. The jack bolt 30 has a screw part 30a and a head part 30c. The stopper member 21 is screwed onto the screw portion 30 a of the jack bolt 30.

  The stopper member 21 is the same as the stopper member 21 according to the second embodiment. The stopper member 21 is screwed to the screw portion 30 a of the jack bolt 30.

  The screw portion 30a is a shaft-like portion having a male screw formed on the outer peripheral surface thereof. This male screw corresponds to a female screw formed on the inner peripheral surface of the screw hole 3 a of the bed 3 and a female screw formed on the inner peripheral surface of the screw hole 21 a of the stopper member 21. The length of the screw portion 30a is configured to be shorter than the length of the screw portion 20a of the jack bolt 20 according to the second embodiment. The head 30c is a shaft-shaped portion having a regular hexagonal cross section provided at the upper end of the screw portion 30a. The head portion 30c is expanded in diameter relative to the screw portion 30a.

  The difference between the jack bolt 30 according to the third embodiment and the jack bolt 20 according to the second embodiment is that the axial length x (vertical length) of the threaded portion 30a of the jack bolt 30 according to the third embodiment. Is set to be shorter than the sum of the vertical length y of the screw hole 3a of the bed 3 and the vertical length z (thickness) of the stopper member (x <(y + z)). .

  When the jack-up operation is not performed, the screw bolt 30a is screwed into the screw hole 3a of the floor 3 with the head 30c facing upward ( FIG. 10 (a)). A stopper member 21 is screwed to the lower end portion of the screw portion 30 a of the jack bolt 30. At this time, as shown in FIG. 10A, the upper surface 21 d of the stopper member 21 is screwed so as to be in contact with and in close contact with the lower surface 3 b of the bed 3. Here, the axial length (vertical length x) of the screw portion 30a of the jack bolt 30 is the vertical length y of the screw hole 3a of the bed 3 and the vertical length z (thickness) of the stopper member 21. Therefore, even if the jack bolt 30 is screwed into the screw hole 3a of the floor 3 until the screwing amount becomes the maximum, the lower end of the screw portion 30a is set. Does not protrude from the lower surface 21e of the stopper member 21. That is, it is not necessary to separately adjust the screwing amount of the jack bolt 30 so that the lower end of the screw portion 30a does not protrude from the lower surface 21e of the stopper member 21.

  Here, the difference between the vertical length z of the stopper member 21 and the distance between the lower surface 3b of the bed 3 and the floor 4 of the hull 7 is the vertical direction of the bed 3 relative to the floor 4 of the hull 7. This is the allowable range of displacement. Therefore, by setting the vertical length z of the stopper member 21 to an appropriate length, it is possible to appropriately change the allowable range of the vertical displacement.

  Then, when performing the jack-up operation, the operator applies a spanner or the like to the chamfered portions 21 b and 21 b of the stopper member 21, rotates the stopper member 21 in the circumferential direction, and causes the stopper member 21 to be threaded 30 a of the jack bolt 30. Move downward with respect to. That is, the protrusion amount of the stopper member 21 from the lower end of the screw portion 30a is increased. When the amount of downward protrusion of the stopper member 21 reaches a predetermined amount, the lower surface 21e of the stopper member 21 contacts the floor surface 4 of the hull 7. If the stopper member 21 is further protruded downward in this state, the distance between the floor surface 4 of the hull 7 and the pedestal 3 increases, and the pedestal 3 is jacked up with respect to the floor surface 4 of the hull 7. (See FIG. 10B). By doing so, the vibration isolating member 5 can be replaced.

  On the other hand, when the base 7 including the engine 1 and the like is tilted when the hull 7 is vigorously shaken when the jack-up operation is not performed, the stopper member 21 and the floor surface of the hull 7 are shown in FIG. 4 and abut. At this time, since the lower end of the screw portion 30a of the jack bolt 30 does not protrude from the lower surface 21e of the stopper member 21, no stress is directly applied to the jack bolt 30. At this time, since the upper surface 21d of the stopper member 21 is in contact with and in close contact with the lower surface 3b of the platform 3, a force is transmitted through the upper surface 21d of the stopper member 21 (see the arrow in FIG. 11). Therefore, compared with the case where it is set as the structure which does not provide the stopper member 21, the stress which the jack bolt 30 bears is reduced. Therefore, buckling of the jack bolt 30 and damage to the screw thread can be prevented.

  As described above, in the jack bolt 30 according to this embodiment, the vertical length x of the screw portion 30a of the jack bolt 30 is equal to the vertical length y of the screw hole 3a of the bed 3 and the vertical length z of the stopper member 21. And is shorter than the sum of (x <(y + z)).

  With this configuration, when the jack bolt 30 and the stopper member 21 are mounted, there is no possibility that the lower end of the screw portion 30a of the jack bolt 30 protrudes downward (on the installation surface side) from the stopper member 21, and an assembly error is caused. Can be prevented.

  Further, by providing the engine 1 with the jack bolt 10 (20/30) according to any one of the first to third embodiments, when the hull 7 or the like on which the engine 1 is installed shakes violently, The force is transmitted through the attached surface 10d or the upper surface 21d of the stopper member 21. Therefore, compared with the case where it is set as the structure which does not provide the stopper part 10b or the stopper member 21, the stress which the thread part 10a (20a * 30a) of the jack bolt 10 (20 * 30) bears is reduced. Therefore, it is possible to prevent buckling of the screw portion 10a (20a, 30a) of the jack bolt 10 (20, 30) and damage to the screw thread.

1 Engine (anti-vibration device)
3 Base floor 3b Bottom surface of base floor 4 Floor of the hull (installation surface)
5 Anti-vibration member 10 Jack bolt 10a Screw part 10b Stopper part 10d Stepped surface

Claims (4)

In a jack bolt having a function of anti-vibration member interposed between the floor and the floor surface, and jacking up the floor to the floor surface,
A screw portion that is screwed into a screw hole provided in the platform so that the screwing amount can be adjusted, and a stopper portion that is provided at a lower end of the screw portion and has a diameter increased with respect to the screw portion,
When the screwing amount of the screw portion reaches a predetermined amount, the stopper portion comes into contact with the floor surface, so that the vibration isolating member can be replaced.
When the screwing amount of the threaded portion is less than a predetermined amount, the stopper member comes into contact with the floor surface when the platform floor is inclined with respect to the floor surface, and the vertical displacement of the platform floor with respect to the floor surface is allowed. Jack bolt characterized by limiting the range . The jack bolt according to claim 1,
The jack bolt has an operation portion, a screw portion, and a stopper portion in order from the top, and the operation portion is provided at an upper end of the screw portion and is reduced in diameter relative to the screw portion. The operation unit rotates in the circumferential direction.
A jack bolt, wherein a stepped surface is formed on the upper surface of the stopper portion, and the stepped surface is in contact with the lower surface of the platform.   3. The jack bolt according to claim 1 or 2, wherein the vertical length of the screw portion of the jack bolt is obtained by adding the vertical length of the screw hole of the platform and the vertical length of the stopper member. Jack bolt characterized by having a shorter dimension setting.   An engine comprising the jack bolt according to any one of claims 1 to 3.

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