JP2007190982A - Sealing structure of thruster for vessel and thruster having the sealing structure - Google Patents

Sealing structure of thruster for vessel and thruster having the sealing structure Download PDF

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JP2007190982A
JP2007190982A JP2006009467A JP2006009467A JP2007190982A JP 2007190982 A JP2007190982 A JP 2007190982A JP 2006009467 A JP2006009467 A JP 2006009467A JP 2006009467 A JP2006009467 A JP 2006009467A JP 2007190982 A JP2007190982 A JP 2007190982A
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bearing housing
gear case
peripheral
joint
protrusion
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JP2006009467A
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JP4361535B2 (en
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Mitsunobu Hino
満伸 日野
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Kawasaki Heavy Ind Ltd
川崎重工業株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a seal structure for a marine thruster that reliably prevents water from entering a shim provided on a joint surface between a gear case and a bearing housing in a propeller portion and does not cause crevice corrosion on the joint surface.
SOLUTION: A shim 41 is incorporated in a joint surface 40 between a bearing housing 23 and a gear case 22 so as to adjust the tooth contact between the bevel pinion and the bevel wheel. An outer projecting portion 30 projecting toward the gear case 22 side is provided, and water can be prevented from entering the joining surface 40 between the inner peripheral surface 29 of the outer projecting portion 30 and the outer peripheral surface 27 of the gear case 22. An O-ring 39 is provided.
[Selection] Figure 2

Description

  The present invention relates to a seal structure in a marine thruster, and more particularly to a seal structure in a propeller portion of a marine thruster and a marine thruster including the seal structure.

  Conventionally, as a marine thruster, there are a side thruster for attitude control, an azimuth thruster (entire swivel propulsion device) capable of turning the entire propeller portion by 360 °, and the like. Side thrusters are used in many ships as auxiliary propulsion units for takeoff and landing. Since the azimuth thruster has a very high kinematic performance compared to a line shaft type propulsion device, the azimuth thruster is mainly used for ships that require high kinematic performance such as tugboats. This azimuth thruster has recently begun to be adopted as a marine propulsion device because of its excellent motion performance. In the following description, this azimuth thruster will be described as an example of a marine thruster.

  FIG. 8 is a longitudinal sectional view showing an azimuth thruster having a general structure. As shown in the figure, this azimuth thruster 101 includes a platform portion 102 that fixes the entire azimuth thruster to the hull S, an upper gear box 103 that horizontally receives the power of the drive engine provided on the hull side, and the upper gear box. 103, a strut portion 107 having a pinion shaft 106 for transmitting power in the vertical direction by a bevel pinion 104 and a bevel wheel 105, and a bevel for transmitting the power of the pinion shaft 106 to a propeller shaft 108 arranged in a horizontal direction. A propeller unit 111 incorporating a pinion 109 and a bevel wheel 110 and a propeller 112 driven by a propeller shaft 108 of the propeller unit 111 are provided.

  The propeller 111 is provided with an opening 113 for assembling / disassembling the bevel pinion 109 of the pinion shaft 106 arranged in the vertical direction and the bevel wheel 110 of the propeller shaft 108 arranged in the horizontal direction. ing. The opening 113 forms a gear case 114 of the propeller portion 111 integrally with a lower portion of the strut portion 107, attaches a detachable bearing housing 115 to the gear case 114 with a mounting bolt 122, and removes the bearing housing 115. Thus, the opening 113 is formed on the side of the gear case 114 opposite to the propeller.

  Usually, the joint 121 between the gear case 114 and the bearing housing 115 is assembled in a joint structure (so-called spigot structure) that joins the concave and convex ends, and the bearing housing 115 is axially moved along the gear case 114. A guide surface is also formed so as to be slid and assembled. A sealing material such as an O-ring 116 is provided on the sliding surface of the joint 121 to block seawater from entering.

  On the other hand, when the power transmission direction is changed to a right angle from the pinion shaft 106 arranged in the vertical direction to the propeller shaft 108 arranged in the horizontal direction as described above, the contact between the bevel pinion 109 and the bevel wheel 110 is not good. If appropriate, there is a risk of causing pitching, scoring, and the like, and there is a possibility that predetermined transmission performance cannot be ensured or a gear is broken. Therefore, these tooth contacts are optimally adjusted so as to ensure the predetermined transmission performance intended by the design.

  In order to optimally adjust the tooth contact, it is necessary to adjust both the bevel pinion side and the bevel wheel side. The adjustment on the bevel pinion 109 side is to adjust the position of the bearing housing 117 supporting the pinion shaft 106 in the vertical direction by incorporating an upper tooth contact adjusting shim 118 between the strut portion 107 and the pinion shaft bearing housing 117. Is done by. The adjustment on the bevel wheel 110 side is performed by adjusting the position of the bearing housing 115 in the horizontal direction by incorporating a tooth contact adjusting shim 119 (hereinafter referred to as “shim”) between the bearing housing 115 and the gear case 114. The tooth contact is adjusted by adjusting the position of the bevel wheel 110 with respect to the bevel pinion 109.

  FIG. 9 is a perspective view schematically showing a shimming adjustment shim for an azimuth thruster. The shim 119 is made of a thin brass plate having a thickness of about 0.1 to 1.0 mm, and is assembled so that the contact position of the bevel wheel 110 is an optimum position by combining a plurality of these various thicknesses. The shim 119 is generally manufactured in a split shape. Reference numeral 123 denotes an insertion hole for the mounting bolt 122. The shim 119 is assembled with the shim 119 of various thicknesses being assembled while the bearing housing 115 of the uneven joint 121 is engaged with the gear case 114 with the mounting bolt 122 removed from the joint 121. Together, it is assembled from the side part of the joint part 121.

  As this type of conventional technology, a shim is placed between the installation flange of the vertical water jet propulsion unit and the gear case provided on the installation flange to adjust the contact between the bevel pinion and the bevel wheel. (For example, refer to Patent Document 1).

As another prior art, in order to make the azimuth thruster propeller not project downward from the bottom of the ship, a downwardly open conical bottom is formed on the bottom of the ship, and a propeller is provided in the conical bottom. There is a structure in which the propulsion shaft is supported obliquely and can be swung in the conical ship bottom (see, for example, Patent Document 2).
Japanese Patent No. 2999191 (2nd page, FIG. 1) Japanese Utility Model Publication No. 60-148197 (2nd page, FIG. 1)

  However, as described above, a plurality of shims 119 are combined and installed in the joint portion 121 between the gear case 114 and the bearing housing 115, and the shim 119 has a split shape as described above. The mating surface 125 of the two split portions is always exposed to seawater, and the seawater enters from the two split portions to the outside of the O-ring of the joint portion 121. This means that even when a plurality of shims 119 are stacked, even if the two split mating surfaces 125 are shifted in the circumferential direction, seawater enters through the gap corresponding to the plate thickness. Then, each joint surface 124 of the joint portion 121 into which seawater has invaded is corroded in the same manner as battery corrosion due to ion concentration difference due to a gap between the gear case 114 and the shim 119 provided between the bearing housing 115. Crevice corrosion may occur. In particular, crevice corrosion may occur at an early stage due to salt in seawater. When this crevice corrosion occurs, it takes a lot of time and labor to repair the joint surface 124, which requires a great deal of cost.

  Such a problem does not occur in Patent Document 1 in which the shim 119 does not immerse in water, and means for solving this problem is not described in the Patent Document 1. Also, Patent Document 2 does not describe means for solving such a problem.

  Accordingly, the present invention provides a marine thruster seal structure that reliably prevents water from entering a shim provided at a joint portion between a gear case and a bearing housing in a propeller portion of a marine thruster and does not cause crevice corrosion on the joint surface. And a marine thruster including the same.

  In order to achieve the above object, a seal structure for a marine thruster according to the present invention includes a propeller portion that meshes a bevel pinion of a pinion shaft arranged in a vertical direction with a bevel wheel of a propeller shaft arranged in a horizontal direction. A bearing housing provided with a bearing for supporting the propeller shaft is fixed to the gear case of the portion, and a shim is incorporated in a joint surface between the bearing housing and the gear case to adjust the contact between the bevel pinion and the bevel wheel. A marine thruster sealing structure configured, wherein an outer projecting portion projecting from the bearing housing toward the gear case side or from the gear case toward the bearing housing side is provided on an outer peripheral portion of a joint surface between the bearing housing and the gear case, The inner peripheral surface of the outer protrusion and the bearing housing or gear case where the outer protrusion is located on the outer periphery. It is provided with a sealing member for preventing water from entering into the joint surface between the circumferential surface. This configuration is a basic configuration of the present invention, and by this, water can be reliably blocked outside the shim provided at the joint between the gear case and the bearing housing, and the corrosion problem at this joint can be solved. It is possible to provide a marine thruster seal structure capable of achieving the above.

  Further, the outer protrusion is configured in a sleeve shape separate from the bearing housing or the gear case, a fixing member is provided for fixing the outer protrusion to the gear case or the bearing housing, and an inner periphery of the outer protrusion is provided. You may provide the said sealing material between a surface and the outer peripheral surface of the said gear case or bearing housing in which this outer side protrusion part is located in an outer periphery. Thereby, the process of the junction part of a gear case and a bearing housing and an outside protrusion part can be processed easily, and the process and shim adjustment of a junction part can be performed efficiently.

  Further, the space generated between the axial end of the outer protrusion and the bearing housing or gear case is widened from the outer surface side of the outer protrusion toward the sliding surface of the bearing housing or gear case. It may be formed and the space may be filled with a waterproof material. As a result, water can be prevented from entering by the waterproof material outside the sealing material.

  Further, an inner guide surface for guiding the bearing housing in the axial direction is formed on the bearing housing side of the gear case, and an outer guide surface that slides along the inner guide surface is formed on the gear case side of the bearing housing, A sealing material may be provided between the outer guide surface of the bearing housing and the inner guide surface of the gear case. Thereby, even if water passes through the shim, the sliding surface of the joint portion between the bearing housing and the gear case can be reliably blocked from entering the gear case.

  Further, when the outer guide surface of the bearing housing is moved in the axial direction along the inner guide surface of the gear case, an axial length that can form a space on the outer peripheral side of the joint surface of the end portion of the outer protrusion. You may form. As a result, when a shim is incorporated into the joint surface between the bearing housing and the gear case, the work can be performed with the outer guide surface of the bearing housing engaged with the inner guide surface of the gear case, and quick shim adjustment work can be performed. it can.

  Moreover, you may provide the greasing port which grits to the shim outer peripheral part of the said joint surface from the outer side of this outer side protrusion part in the base part of the said outer side protrusion part. Thereby, oil or grease can be supplied between the outer protruding portion and the shim outer peripheral portion of the joint surface, and water can be prevented from entering even by this oil.

  On the other hand, the marine thruster provided with the seal structure of the present invention can easily adjust the gear tooth contact in the propeller portion by providing any one of these seal structures, and a shim for this tooth contact adjustment. In addition, it is possible to stably prevent crevice corrosion at the joints.

  The present invention provides a seal structure for a marine thruster that reliably blocks water from entering a shim provided on the joint surface between the gear case and the bearing housing by means as described above, and does not cause crevice corrosion. It becomes possible.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Also in the following embodiments, an azimuth thruster is taken as an example of a marine thruster. 1 is a longitudinal sectional view of a seal structure for a marine thruster according to a first embodiment of the present invention, and FIG. 2 is a portion of a joint surface between a gear case and a bearing housing in the seal structure for a marine thruster shown in FIG. 3 is an enlarged longitudinal sectional view, and FIG. 3 is a longitudinal sectional view further enlarging the portion of the joint surface between the gear case and the bearing housing shown in FIG. 4 (a), (b), and (c) are schematic diagrams showing the tooth contact state, and FIGS. 5 (a) and (b) are adjustment methods according to the tooth contact state shown in FIG. FIG. The shim is the same as the perspective view shown in FIG.

  An azimuth thruster 1 shown in FIG. 1 includes an upper pinion of an upper bevel pinion 5 via an input coupling 4 for the power of an output shaft 3 of a motor (not shown) and a platform portion 2 that fixes the entire azimuth thruster to the hull S. An upper gear box 7 received by the shaft 6 and a pinion that transmits the power of the upper bevel wheel 8 meshing with the upper bevel pinion 5 of the upper pinion shaft 6 disposed in the horizontal direction in the upper gear box 7 downward in the vertical direction. Power is arranged in a horizontal direction by a shaft 9, a strut portion 11 containing a bearing 10 that supports the pinion shaft 9, and a lower bevel wheel 14 that meshes with a lower bevel pinion 12 provided at the lower portion of the pinion shaft 9. A propeller unit 15 configured to transmit to the propeller shaft 13, and a propeller 1 driven by the propeller shaft 13 It is equipped with a door.

  Thereby, the power of the output shaft 3 of the prime mover is arranged in a vertical direction in which the upper bevel pinion 5 arranged in the upper gear box 7 is rotated and rotated by the upper bevel wheel 8 meshing with the upper bevel pinion 5. The propeller shaft 13 disposed in the horizontal direction provided in the lower propeller portion 15 is rotated via the pinion shaft 9 thus formed. Then, the propeller 16 is rotated by the propeller shaft 13, and by the rotation of the propeller 16, seawater is sucked from the right side of the duct 17 to become a jet flow, and a thrust for propelling the hull S from the left side of the duct 17 is generated. It is done.

  Further, the platform portion is provided with a turning motor 18 and a turning gear 19. By rotating the turning gear 19 by the turning motor 18, the entire propeller portion 15 together with the strut portion 11 can be turned 360 °. It is possible. Reference numeral 20 denotes a turning bearing.

  On the other hand, the propeller unit 15 is provided with an opening 21 for assembling / disassembling the propeller shaft 13 and the lower bevel wheel 14. The opening 21 forms a gear case 22 of the propeller portion 15 integrally with a lower portion of the strut portion 11, attaches a bearing housing 23 detachably to the gear case 22 with a mounting bolt 35, and removes the bearing housing 23. Thus, the opening 21 is formed on the side opposite to the propeller of the gear case 22. That is, by removing the illustrated bearing housing 23 to the right side of the figure, the side opposite to the propeller of the gear case 22 is opened, and the opening 21 is formed.

  The propeller portion 15 is provided with bearings 24 and 25 for supporting the propeller shaft 13. The propeller portion 15 is provided on the bearing 24 provided on the bearing housing 23 located on the side opposite to the propeller and the gear case 22. The propeller shaft 13 is supported by the bearing 25. The bearing 24 also supports a reaction force of the propeller thrust.

  As shown in FIGS. 2 and 3, the joint portion 26 between the gear case 22 and the bearing housing 23 of the propeller portion 15 is a joint structure (hereinafter referred to as a concavo-convex end) formed on the gear case 22 and the bearing housing 23. , "In-roof structure"). On the side of the gear case 22 of this inlay structure, an annular outer peripheral surface 27 is formed on the radially outer surface side, and an annular inner guide surface 28 is formed on the radially inner surface side. Further, the bearing housing 23 side includes a cylindrical outer protrusion 30 that forms an annular inner peripheral surface 29 that contacts the outer peripheral surface 27 of the gear case 22, and an annular outer guide surface that faces the inner guide surface 28. An inner projecting portion 32 that forms 31 is formed. This first embodiment is an example in which an outer protrusion 30 is provided so as to protrude from the bearing housing 23 side toward the gear case 22 side. The surfaces 27, 28, 29 and 31 are formed concentrically. An outer peripheral spigot surface 33 is formed by the outer peripheral surface 27 of the gear case 22 and the inner peripheral surface 29 formed on the outer protrusion 30 of the bearing housing 23, and the inner guide surface 28 of the gear case 22 and the inner protrusion 32 of the bearing housing 23 are formed. An inner peripheral inlay surface 34 is constituted by the outer guide surface 31 formed. The inner peripheral spigot surface 34 is formed to have a longer axial length than the outer peripheral spigot surface 33.

  A joint surface 40 that is orthogonal to the propeller shaft 13 is formed between the outer peripheral spigot surface 33 and the inner peripheral spigot surface 34. The joint portion 26 configured as described above is in contact with the inner peripheral surface 29 formed on the outer protrusion 30 of the bearing housing 23 on the outer side of the outer peripheral surface 27 formed on the gear case 22, and the inner guide formed on the gear case 22. The outer guide surface 31 formed on the bearing housing 23 is assembled so as to contact the inner side of the surface 28. The axial center position of the gear case 22 and the bearing housing 23 is maintained by the joint portion 26 of the inlay structure. With the gear case 22 and the bearing housing 23 positioned, the bearing housing 23 is attached to the gear case 22 by the mounting bolt 35. Fixed to.

  The inner projecting portion 32 of the bearing housing 23 formed in the inlay structure is provided with a groove 36 at a predetermined position shifted in the axial direction from the end surface, and an inner O-ring 37 serving as a sealing material is provided in the groove 36. Yes. Further, a groove 38 is provided on the outer peripheral surface of the gear case 22 at a predetermined position shifted in the axial direction from the end surface, and an outer O-ring 39 serving as a sealing material is provided in the groove 38. The outer O-ring 39 is a sealing material provided between the inner peripheral surface 29 of the outer protrusion 30 and the outer peripheral surface 27 of the gear case 22 where the outer protrusion 30 is located on the outer periphery. In this embodiment, O-rings 37 and 39 as sealing materials are provided on the outer side and the inner side of the joint surface 40 between the gear case 22 and the bearing housing 23 in the joint portion 26 to block water from entering the gear case 22. is doing.

  A tooth contact adjusting shim 41 for adjusting the tooth contact between the bevel pinion 12 and the bevel wheel 14 (see FIG. 1) is incorporated in the joint surface 40 between the gear case 22 and the bearing housing 23. Yes. The shim 41 optimizes its thickness in order to adjust the contact of the bevel wheel 14 with respect to the bevel pinion 12. This tooth contact adjustment requires delicate thickness adjustment, and a joint surface between the gear case 22 and the bearing housing 23 by combining thin shims 41 (for example, 0.1 to 1.0 mm thin brass plates) having different thicknesses. 40. Similarly to the shim 119 shown in FIG. 9, the shim 41 is also manufactured in a semi-annular (for example, a radius of 400 mm to 750 mm) two-divided shape. By incorporating the shim 41 into the joint surface 40, the relative position of the bearing housing 23 with respect to the gear case 22 is adjusted, and the position of the bevel wheel 14 is adjusted via the bearing 24 that supports the propeller shaft 13 provided with the bevel wheel 14. Done. In this tooth contact adjustment, the thickness of the shim 41 is determined while observing the tooth contact condition of the tooth surface, and fine thickness adjustment is performed.

  As the thickness adjustment of the shim 41, the tooth contact in the state shown in FIG. 4 (a) is a preferable state, and the center portions of the tooth surfaces u are in contact with each other (t indicates the tooth contact portion). The tooth contact adjustment is performed by incorporating a preferable thin plate shim 41 in the joint surface 40 between the bearing housing 23 and the gear case 22 so as to achieve the above state. The thickness of the shim 41 is determined while adjusting by repeatedly inserting and removing it and combining it so that the tooth contact position between the bevel pinion 12 and the bevel wheel 14 becomes the optimum position. Therefore, as shown by a two-dot chain line in FIG. 2, it is easy to insert and remove the shim 41 in a state where the outer guide surface 31 of the inner protrusion 32 of the bearing housing 23 is engaged with the inner guide surface 28 of the gear case 22. As shown in FIG. 9, it is manufactured in the shape of a semi-circular double crack as shown in FIG. In order to obtain a good tooth contact with the bevel gear in the propeller portion 15, it is necessary to adjust the bevel pinion 12 side and then the bevel wheel 14 side, but as shown in FIG. The tooth contact adjustment of the bevel wheel 14 is assumed as the tooth contact adjustment of the lower bevel pinion 12 is adjusted by incorporating an upper tooth contact adjustment shim 43 between the strut portion 11 which is the upper part of the gear case 22 and the pinion shaft bearing housing 42. Only will be described below.

  As shown in FIG. 4 (b), when the upper portions of the tooth surfaces u come into contact with each other, as shown in FIG. 5 (a), the bearing housing 23 and the gear case 22 are joined so that the bevel wheel 14 approaches the bevel pinion 12. The number of shims 41 is reduced by removing the corresponding shims 41 so that the total thickness of the shims 41 incorporated in the surface 40 is reduced. Thereby, the bevel wheel 14 is moved in a direction approaching the bevel pinion 12.

  As shown in FIG. 4 (c), when the lower portions of the tooth surfaces u come into contact with each other, as shown in FIG. 5 (b), the bearing housing 23 and the gear case 22 are separated so that the bevel wheel 14 is separated from the bevel pinion 12. A shim 41 having a preferable thickness is incorporated in the joint surface 40. As a result, the bevel wheel 14 is moved away from the bevel pinion 12. Such shim adjustment is performed by repeatedly trying and erroring the shim 41 in and out.

  Further, the work of inserting and removing the shim 41 is provided on the gear case 22 side of the bearing housing 23 in a state where the mounting bolt 35 fixing the bearing housing 23 to the gear case 22 is loosened and removed from the joint surface 40. The outer guide surface 31 of the inner projecting portion 32 is engaged with the inner guide surface 28 formed on the joint surface side of the gear case 22 to keep the weight of the bearing housing 23 supported by the gear case 22 while maintaining the state of the joint surface 40. The shim 41 can be easily inserted and removed from the outer space. That is, while maintaining the engaged state of the inner peripheral spigot surface 34, the outer peripheral spigot surface 33 is set in a state of being axially disengaged so that the shim 41 can be inserted and extracted from the outside of the joint portion 26. In this way, the thickness adjustment of the shim 41 can be easily performed without removing the bearing housing 23. In order to adjust the tooth contact more easily, a viewing window may be provided at a place (gear case 22) where the contact between the bevel pinion 12 and the bevel wheel 14 in the gear case 22 can be confirmed from the outside.

  On the other hand, as shown in FIGS. 2 and 3, a space 44 between the joint surface 40 of the bearing housing 23 and the joint surface 40 of the gear case 22 is provided in the vicinity of the base of the outer protrusion 30 provided in the bearing housing 23. A filling plug 45 for filling oils and greases such as grease is provided. This space 44 serves as an oil reservoir for storing oils 47 between the outer periphery of the shim 41 incorporated in the joint surface 40 between the gear case 22 and the bearing housing 23 and the inner periphery of the outer protrusion 30.

  Further, the filling plug 45 is provided at the lower part of the outer projecting portion 30, and an air vent plug 46 is provided at the upper part for extracting the air in the space 44 to the outside when supplying oils and fats (FIG. 2). ). Both the filling plug 45 and the air vent plug 46 can seal water from the outside and seal oil inside.

  In this way, the outer periphery of the shim 41 provided on the joint surface 40 can be filled with the fats and oils 47, and oil or grease is supplied from the filling plug 45 to the joint 26 between the gear case 22 and the bearing housing 23. By filling with oils and fats such as, the outer peripheral portion of the shim 41 incorporated in the joint portion 26 is prevented from coming into contact with water.

  In addition, a gap 48 is provided between the gear case 22 and the bearing housing 23 at the end of the outer peripheral spigot surface 33 between the gear case 22 and the bearing housing 23, and a sufficient amount of waterproof material 49 is filled in the gap 48. To be able to. The gap 48 is formed between the gear case 22 side and the outer protrusion 30 on the bearing housing 23 side at an angle (drop-off prevention angle) such that the space is expanded toward the center. That is, the waterproof material 49 filled in the gap 48 is prevented from falling off after curing. Accordingly, by adopting a shape that gives the gap 48 between the gear case 22 and the bearing housing 23 a drop-off prevention angle, the gap 48 is filled with the waterproof material 49 so that the outer portion of the O-ring 39 is also filled. The intrusion of water is blocked. In addition, by widening the outside of the gap 48, the waterproof material 49 can be filled so as not to protrude greatly from the outer surface of the outer protrusion 30, and the waterproof effect can be exhibited without dropping from the gap 48 due to water flow. The waterproof material 49 that can suppress the increase in resistance can be easily provided.

  Further, a groove 50 for attaching a seating surface O-ring 51 for sealing between the seating surface and the bearing housing 23 is provided on the seating surface of the mounting bolt 35 for fixing the bearing housing 23 to the gear case 22. By providing a seating surface O-ring 51 in the groove 50 and fixing the mounting bolt 35, water does not enter from the seating surface of the mounting bolt 35 into the body portion or screw portion of the bolt. The sealing material on the seating surface of the mounting bolt 35 may be packing or liquid packing other than the O-ring 51.

  As described above, in the first embodiment, the waterproof material 49 is provided in the gap 48 between the gear case 22 and the end of the outer protrusion 30 of the bearing housing 23 incorporated in the inlay structure to block water from entering, Water blocking by an O-ring 39 that is a sealing material provided between the outer peripheral surface 27 of the gear case 22 and the inner peripheral surface 29 of the outer protrusion 30 of the bearing housing 23, and the joint surface 40 between the gear case 22 and the bearing housing 23. The gear case 22, the bearing housing 23, and the like are separated by blocking water with oils 47 filled from the filling plug 45 in a space 44 provided between the outer periphery of the shim 41 provided on the inner surface and the inner periphery of the outer protrusion 30. Intrusion of water is reliably blocked outside the shim 41 provided on the joint surface 40.

  According to the seal structure 52 of the first embodiment configured as described above, the inner projecting portion 32 of the bearing housing 23 is formed on the gear case 22 so that the joint surface 40 of the bearing housing 23 is aligned with the joint surface 40 of the gear case 22. By inserting the shim 41 between the joint surfaces 40 and inserting the shim 41 between the joint surfaces 28 and fixing the bearing housing 23 to the gear case 22 with the mounting bolts 35, the outer periphery of the shim 41 and the outer peripheral surface 27 of the gear case 22 are Water can be blocked by an outer O-ring 39 provided between the inner peripheral surface 29 of the housing 23.

  In addition, since the space 44 between the inner surface of the outer protrusion 30 and the shim 41 is filled with oils and fats 47 (grease), the oils and oils 47 can also block water from entering. In addition, since the waterproof material 49 is filled in the gap 48 formed between the gear case 22 and the end of the outer protruding portion 30 of the bearing housing 23, the waterproof material 49 prevents the O-ring 39 and the oils and fats 47. Since water intrusion into the portion is temporarily blocked, water intrusion into the shim 41 at the joint portion 26 between the gear case 22 and the bearing housing 23 can be reliably blocked.

  In this embodiment, an inner O-ring 37 is provided between the inner guide surface 28 of the gear case 22 and the outer guide surface 31 of the bearing housing 23, so that even if water passes through the shim 41, the water enters the gear case 22. Is blocked from doing.

  Further, in the seal structure 52 of the first embodiment, water intrusion is blocked by a plurality of configurations. However, only the O-ring 39 that blocks water on the outer peripheral side of the shim 41, only the fats and oils 47 are blocked. Even a basic configuration such as the configuration or the configuration of only the waterproof material 49 can block water, and it is not necessary to provide all the configurations to block water. These may be determined according to use conditions and the like.

  As described above, according to the seal structure 52 of the first embodiment, the crevice corrosion at the joint surface 40 between the gear case 22 and the bearing housing 23 can be prevented and the corrosion of the shim 41 incorporated into the joint surface 40 can be prevented. Therefore, the mounting bolt 35 of the bearing housing 23, which is an important bolt that supports the thrust load of the propeller 16 and the reaction force load of the bevel wheel 14, also has a screw portion and a trunk portion that are high stress portions. Since exposure to water can be prevented, the fatigue strength of the mounting bolt 35 can be improved, the life time of the mounting bolt 35 can be greatly extended, and the maintenance period can be extended. . Moreover, according to the azimuth thruster 1 (marine thruster) provided with this seal structure 52, such an effect can be exhibited.

  FIG. 6 is an enlarged longitudinal sectional view of a part of the seal structure for a marine thruster according to the second embodiment of the present invention. This 2nd Embodiment differs in the structure regarding the outer protrusion part 30 in the seal structure 52 of the said 1st Embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the structure in the said 1st Embodiment, and the detailed description is abbreviate | omitted. The overall configuration is the same as that of the first embodiment, and a description thereof will be omitted.

  As shown in the figure, in the second embodiment, the outer protrusion 60 is formed in a sleeve shape separate from the bearing housing 61. The outer projecting portion 60 is formed on an inner peripheral surface 66 whose inner peripheral dimension can secure a gap 62 with respect to the outer peripheral dimension of the mounting surface of the mounting bolt 35 in the bearing housing 61. In the bearing housing 61 of the second embodiment, an outer mounting surface 63 is formed with an outer peripheral dimension substantially equal to the diameter dimension of the inner peripheral surface 66 of the outer protrusion 60. The outer mounting surface 63 is formed with substantially the same diameter as the outer peripheral surface 27 formed on the joint surface 40 side of the gear case 22. Grooves 38 and 64 for providing O-rings 39 and 65 as sealing materials at predetermined positions respectively shifted in the axial direction from the joint surface 40 on the outer peripheral surface 27 of the gear case 22 and the outer mounting surface 63 of the bearing housing 61. Is provided. In the second embodiment, a concave portion 71 that forms an oil sump space is provided on the outermost peripheral portion of the joint surface 40 of the bearing housing 61. The concave portion 71 is formed on the entire circumference of the bearing housing 61.

  The sleeve-shaped outer protrusion 60 is fixed to the outer periphery of the outer mounting surface 63 formed on the bearing housing 61. The outer protrusion 60 and the bearing housing 61 are provided with a threaded portion 67 for fixing the outer protrusion 60 to the bearing housing 61 from the outside in the radial direction. The threaded portion 67 is provided so as to coincide with the radial direction of the outer projecting portion 60 and the bearing housing 61, and a plurality of the threaded portions 67 are provided in the circumferential direction. A set screw 68 is screwed into the threaded portion 67 from the outer surface side of the outer projecting portion 60 and screwed to the threaded portion 67 formed in the bearing housing 61, whereby the axial movement of the outer projecting portion 60 is prevented and the bearing housing. 61 is fixed.

  Further, the outer projecting portion 60 is provided with a filling plug 45 for filling the concave portion 71 with oil or grease 47 such as oil or grease from the outer peripheral side. The filling plug 45 is provided at the lower part of the outer protruding part 60, and an air vent plug 46 is provided at the upper part of the outer protruding part 60 in the same manner as in the first embodiment shown in FIG.

  Also in the second embodiment, as in the first embodiment, a gap 48 is provided between the gear case 22 and the end of the outer protrusion 60, and the gap 48 is spaced toward the center. The gap 48 is filled with a waterproof material 49. In the second embodiment, a waterproof material 70 that blocks water intrusion is also provided between the outer protrusion 60 configured separately from the bearing housing 61 and the bearing housing 61. In the waterproof material 70, a gap 69 is provided between the mounting bolt 35 side of the outer projecting portion 60 and the bearing housing 61 so that the space extends toward the back side in the axial direction, and the gap 69 is filled. Since this waterproof material 70 is also filled in the gap 69 in which the space extends toward the back, it does not come off after curing.

  According to the seal structure 72 of the second embodiment configured as described above, the outer peripheral surface 27 formed on the gear case 22, the outer mounting surface 63 formed on the bearing housing 61, and the inner protrusion formed on the outer protrusion 60. Since the peripheral surface 66 can be processed as separate members, individual processing can be performed efficiently. Further, since the shim thickness adjustment operation for inserting or removing the shim 41 to or from the joint surface 40 between the gear case 22 and the bearing housing 61 can be performed with the sleeve-like outer protrusion 60 removed, the mounting bolt 35 is loosened. In this state, it can be easily performed from the outer peripheral side of the joint surface 40, and the efficiency of the shim 41 insertion / extraction adjustment work can be improved. After the completion of the shim adjustment work, the work of providing the outer protrusion 60 can be easily performed from the outer peripheral side of the bearing housing 61. Therefore, the thrust contact adjustment and the propeller assembly work can be performed efficiently.

  In addition, also with the seal structure 72 of the second embodiment, the seal by the O-ring 39 which is a seal material provided between the inner peripheral surface 66 of the outer protrusion 60 and the gear case 22, and the shim 41 provided on the joint surface 40. Of the outer peripheral portion and the concave portion 71 are filled with a fat and oil 47 and a seal is provided by waterproof members 49 and 70 provided between the axially opposite ends of the outer protrusion 60 and the gear case 22 and the bearing housing 61. Since the intrusion of water is blocked, a reliable and stable sealing effect can be exhibited.

  FIG. 7 is a longitudinal sectional view of the lower part of the propeller portion showing the seal structure of the marine thruster according to the third embodiment of the present invention. In both the first and second embodiments, the outer projecting portions 30 and 60 are projected from the joint surface 40 side of the bearing housings 23 and 61 toward the gear case 22 side. However, in the third embodiment, This is an example in which an outer protrusion 82 is protruded from the gear case 80 side toward the bearing housing 81 side. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, since the overall configuration is the same as that of the first embodiment, the description thereof is also omitted.

  As shown in the figure, in the third embodiment, an outer protrusion 82 that protrudes toward the bearing housing 81 is formed on the outer periphery of the joint surface 40 of the gear case 80. In this example, the outer protrusion protrudes from the gear case 80. The part 82 is integrally formed.

  On the other hand, an outer peripheral surface 84 facing the inner peripheral surface 83 of the outer protrusion 82 is formed on the joint surface 40 side of the bearing housing 81. The outer peripheral surface 84 is provided with a groove 85 for providing an O-ring 86 as a sealing material. An O-ring 86 provided in the groove 85 seals between the inner peripheral surface 83 of the outer protrusion 82 and the outer peripheral surface 84 of the bearing housing 81.

  In addition, a space 87 serving as an oil reservoir is formed in the outer peripheral portion of the shim 41 provided between the joint surface 40 of the gear case 80 and the bearing housing 81, and the filling plug 45 provided in the outer protruding portion 82. The oil and fats 47 can be filled.

  Furthermore, in the third embodiment, a gap 88 is formed between the end of the outer protrusion 82 formed on the gear case 80 and the bearing housing 81 so that the space expands toward the center. By forming the gap 88, the waterproof material 89 is filled into the gap 88 and the waterproof material 89 that has been filled and cured is prevented from falling off, as in the first and second embodiments. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  According to the seal structure 90 of the third embodiment configured as described above, the inner peripheral surface 83 of the outer protruding portion 82 provided from the joint surface 40 side of the gear case 80 toward the bearing housing 81 side is It is assembled so as to be positioned on the outer periphery of the outer peripheral surface 84 of the housing 81. Thus, water is blocked by the waterproof material 89 provided between the end of the outer protrusion 82 and the bearing housing 81, the inner peripheral surface 83 of the outer protrusion 82, and the outer peripheral surface 84 of the bearing housing 81. The shim 41 provided on the joining surface 40 is not exposed to water due to the blocking of water by the O-ring 86 provided between and the blocking of water by the fats and oils 47 at the outer peripheral portion of the shim 41. It is possible to prevent crevice corrosion on the surface 40 and maintain a stable bonding state.

  In any of the embodiments described above, an azimuth thruster has been described as an example of a marine thruster. However, other marine thrusters such as a side thruster can be similarly applied, and is limited to an azimuth thruster. It is not a thing.

  In the above-described embodiment, the O-rings 39 and 86 are described as examples of the sealing material. However, a sealing material other than the O-rings 39 and 86 may be used, and the sealing material is not limited to the O-ring. Absent.

  Furthermore, in the above-described embodiment, an example in which a plurality of configurations are provided to block water from entering the joint surfaces of the gear cases 22, 80 and the bearing housings 23, 61, 81 has been described. However, the present invention can be implemented even with the basic configuration of this application, and various configurations within a range that does not impair the gist of the present invention may be changed, and the present invention is limited to the embodiment described above. It is not a thing.

  The marine thruster seal structure according to the present invention is a marine thruster that reliably blocks water from entering a shim provided at the joint between the gear case and the bearing housing, and does not cause crevice corrosion on the joint surface. Available as

It is a longitudinal cross-sectional view of the seal structure of the marine thruster which concerns on 1st Embodiment of this invention. FIG. 2 is an enlarged longitudinal sectional view of a joint surface portion between a gear case and a bearing housing in the marine thruster seal structure shown in FIG. 1. FIG. 3 is a longitudinal sectional view further enlarging a portion of a joint surface between the gear case and the bearing housing shown in FIG. 2. (a), (b), (c) is a schematic diagram showing a contact state. (a), (b) is a side view which shows the adjustment method according to the state of tooth contact shown in FIG. It is the longitudinal cross-sectional view which expanded a part of seal structure of the marine thruster which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the lower part of the propeller part which shows the seal structure of the marine thruster which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the azimuth thruster of a general structure. It is a perspective view which shows typically the shim for tooth contact adjustment of an azimuth thruster.

Explanation of symbols

1. Azimuth thruster (marine thruster)
2 ... Platform part
3 ... Output shaft
4 ... Input coupling
5 ... Upper bevel pinion
6 ... Upper pinion shaft
7 ... Upper gearbox
8 ... Upper bevel wheel
DESCRIPTION OF SYMBOLS 9 ... Pinion shaft 10 ... Bearing 11 ... Strut part 12 ... Lower bevel pinion 13 ... Propeller shaft 14 ... Lower bevel wheel 15 ... Propeller part 16 ... Propeller 21 ... Opening 22 ... Gear case 23 ... Bearing housing 24, 25 ... Bearing 26 ... Junction 27 ... Outer peripheral surface 28 ... Inner guide surface 29 ... Inner peripheral surface 30 ... Outer protrusion 31 ... Outer guide surface 32 ... Inner protrusion 33 ... Outer spigot surface 34 ... Inner peripheral spigot surface 35 ... Mounting bolts 36, 38 ... Groove 37 ... Inner O-ring (seal material)
39 ... Outside O-ring (seal material)
DESCRIPTION OF SYMBOLS 40 ... Joint surface 41 ... Shim 42 ... Pinion shaft bearing housing 43 ... Upper tooth | gear adjustment shim 44 ... Space 45 ... Filling plug 46 ... Air vent plug 47 ... Fats and oils 48 ... Crevice 49 ... Waterproof material 50 ... Groove 51 ... Seat surface O-ring 52 ... Seal structure 60 ... Outer protrusion 61 ... Bearing housing 62 ... Gap 63 ... Outer mounting surface 64 ... Groove 65 ... O-ring 66 ... Inner peripheral surface 67 ... Screw part 68 ... Set screw 69 ... Gap 70 ... Waterproof material DESCRIPTION OF SYMBOLS 71 ... Concave part 72 ... Seal structure 80 ... Gear case 81 ... Bearing housing 82 ... Outer protrusion 83 ... Inner peripheral surface 84 ... Outer peripheral surface 85 ... Groove 86 ... O-ring 87 ... Space 88 ... Gap 89 ... Waterproof material 90 ... Seal structure

Claims (7)

  1. A propeller portion that meshes a bevel pinion of a pinion shaft arranged in a vertical direction with a bevel wheel of a propeller shaft arranged in a horizontal direction is fixed, and a bearing housing provided with a bearing that supports the propeller shaft is fixed to a gear case of the propeller portion A seal structure for a marine thruster configured to incorporate a shim into the joint surface between the bearing housing and the gear case to adjust the contact between the bevel pinion and the bevel wheel,
    An outer projecting portion projecting from the bearing housing toward the gear case side or from the gear case toward the bearing housing side is provided on the outer peripheral portion of the joint surface between the bearing housing and the gear case, and the inner peripheral surface of the outer projecting portion and the outer projecting portion are provided. A marine thruster sealing structure in which a sealing material is provided between the bearing housing or the outer peripheral surface of the gear case, the portion of which is located on the outer periphery, to prevent water from entering the joint surface.
  2.   The outer protrusion is configured as a sleeve separate from the bearing housing or the gear case, a fixing member is provided for fixing the outer protrusion to the gear case or the bearing housing, and an inner peripheral surface of the outer protrusion is provided. 2. The marine thruster sealing structure according to claim 1, wherein the sealing material is provided between the outer protrusion of the outer casing and the outer peripheral surface of the gear case or the bearing housing.
  3.   A space formed between the axial end of the outer protrusion and the bearing housing or gear case is formed so that the space expands from the outer peripheral surface side to the inner peripheral surface side of the outer protrusion, The seal structure for a marine thruster according to claim 1 or 2, wherein a waterproof material is filled.
  4.   An inner guide surface that guides the bearing housing in the axial direction is formed on the bearing housing side of the gear case, and an outer guide surface that slides along the inner guide surface is formed on the gear case side of the bearing housing. The seal structure for a marine thruster according to any one of claims 1 to 3, wherein a sealing material is provided between the outer guide surface of the gear and the inner guide surface of the gear case.
  5.   When the outer guide surface of the bearing housing is moved in the axial direction along the inner guide surface of the gear case, the axial length is such that a space can be formed on the outer peripheral side of the joining surface at the end of the outer protrusion. The marine thruster seal structure according to claim 4, wherein the marine thruster seal structure is formed.
  6.   The base part of the said outside protrusion part was provided with the greasing port which grits the shim outer peripheral part of the said joint surface from the outer side of this outside protrusion part, The any one of Claims 1-5 characterized by the above-mentioned. Seal structure for marine thrusters.
  7. A marine thruster comprising the marine thruster seal structure according to any one of claims 1 to 6.

JP2006009467A 2006-01-18 2006-01-18 Marine thruster seal structure and marine thruster equipped therewith Active JP4361535B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006009467A JP4361535B2 (en) 2006-01-18 2006-01-18 Marine thruster seal structure and marine thruster equipped therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006009467A JP4361535B2 (en) 2006-01-18 2006-01-18 Marine thruster seal structure and marine thruster equipped therewith

Publications (2)

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JP2007190982A true JP2007190982A (en) 2007-08-02
JP4361535B2 JP4361535B2 (en) 2009-11-11

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8985746B2 (en) 2012-10-29 2015-03-24 Sii Printek Inc. Liquid jet head, liquid jet apparatus, and method of manufacturing liquid jet head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8985746B2 (en) 2012-10-29 2015-03-24 Sii Printek Inc. Liquid jet head, liquid jet apparatus, and method of manufacturing liquid jet head

Also Published As

Publication number Publication date
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