Telescopic marine stern tube

Abstract

The utility model discloses a telescopic marine stern tube which comprises a rear stern tube and a front stern tube which are sequentially arranged from back to front, the rear stern tube is fixed in an attractive frame of a ship body through epoxy pouring, and the front end and the rear end of the front stern tube are fixed in a rear hub inner hole and a front hub inner hole of the ship body through epoxy pouring respectively. The device further comprises a rear bearing, a loose joint, a middle bearing and a front bearing, the rear bearing is pressed into an inner hole in the rear end of the rear stern tube, the middle bearing is pressed into an inner hole in the rear end of the front stern tube, the front bearing is pressed into an inner hole in the front end of the front stern tube, and the front end of the rear stern tube is connected with the rear end of the front stern tube through the loose joint. According to the scheme, the telescopic marine stern tube is reasonable in structure, the length of the stern tube is adjustable, the bearing is convenient to replace, and work is reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of ship shafting stern tube structure, and in particular to a telescopic marine stern tube. Background Technology

[0002] The stern tube is a component of a ship's shafting system, fixed at the stern of the hull. It is a section of pipe through which the stern shaft passes and is equipped with seals and supports. The main function of the stern tube is to support the weight of the propeller stern shaft and protect it from entanglement with fishing nets and cables. In addition, the stern tube also protects the cooling medium inside from the influence of the water quality outside the ship, providing a good working environment for the bearings.

[0003] In existing technologies, three-bearing stern tubes are primarily installed using welding for connection and fixation. However, on-site welding can cause deformation, making it difficult to ensure the coaxiality of the three bearings. This results in uneven contact between the stern tube and the bearings, leading to overheating during use, accelerated bearing wear, and in severe cases, rendering the tube unusable. Furthermore, replacing bearings in this type of stern tube is also difficult, requiring cutting off the weld, replacing the bearing, and then re-welding. This re-welding process inevitably causes further deformation, and the workload is substantial. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a telescopic marine stern tube with reasonable structure, adjustable stern tube length, convenient bearing replacement, and reliable operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A telescopic marine stern tube includes an aft stern tube and a fore stern tube arranged sequentially from stern to fore. The aft stern tube is fixed to the hull frame by epoxy casting. The fore and aft ends of the fore stern tube are respectively fixed to the inner holes of the aft and fore axle hubs of the hull by epoxy casting. The tube also includes a rear bearing, a loose-fitting joint, a center bearing, and a front bearing. The rear bearing is pressed into the inner hole at the rear end of the aft stern tube, the center bearing is pressed into the inner hole at the rear end of the fore stern tube, and the front bearing is pressed into the inner hole at the front end of the fore stern tube. The front end of the aft stern tube and the rear end of the fore stern tube are connected by a loose-fitting joint.

[0007] Preferably, it also includes a front flange, which is fixedly installed at the front end of the front stern tube, and a front sealing device is installed on the front end face of the front flange.

[0008] Preferably, the front flange is fixedly connected to the front and stern tubes by screws.

[0009] Preferably, a rear sealing device is installed at the rear end face of the rear bearing.

[0010] Preferably, the device also includes a sealing packing and a packing gland, wherein the packing gland is fixedly connected to the rear end of the loose-fitting joint, and the sealing packing is filled between the packing gland and the loose-fitting joint.

[0011] Preferably, the rear bearing and the rear stern tube are fixedly connected by set screws.

[0012] Preferably, the center bearing and the front stern tube are fixedly connected by set screws.

[0013] Preferably, the front bearing and the front stern tube are fixedly connected by set screws.

[0014] This utility model, by adopting the above technical solution, has the following beneficial effects:

[0015] 1. In this utility model, the stern tube is fixed in the hull frame by epoxy casting, and the front and rear ends of the stern tube are fixed in the inner holes of the rear and front axle hubs of the hull by epoxy casting, respectively. Epoxy casting does not generate much heat, and the bearings do not deform much, thus ensuring the coaxiality of the rear bearing, the middle bearing and the front bearing.

[0016] 2. In this utility model, by setting a loose-fitting joint, the length of the stern tube can be finely adjusted. During maintenance, the bearing is easy to replace, making the stern tube more compatible with the stern structure of the hull, and the overall structure of the stern tube more reliable and practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure label:

[0019] 100. Axle frame; 200. Rear axle hub; 300. Front axle hub; 1. Rear bearing; 11. Rear sealing device; 2. Rear stern tube; 3. Sealing packing; 4. Packing gland; 5. Loose-fitting joint; 6. Center bearing; 7. Front stern tube; 8. Front bearing; 9. Front flange; 91. Front sealing device. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] like Figure 1 As shown, this utility model discloses a telescopic marine stern tube, including a rear stern tube 2 and a front stern tube 7 arranged sequentially from rear to front. The rear stern tube 2 is fixed in the hull frame 100 by epoxy casting. The front and rear ends of the front stern tube 7 are respectively fixed in the inner holes of the rear axle hub 200 and the front axle hub 300 of the hull by epoxy casting. It also includes a rear bearing 1, a loose-fitting joint 5, a middle bearing 6 and a front bearing 8. The rear bearing 1 is pressed into the inner hole of the rear end of the rear stern tube 2 and is fixedly connected to the rear stern tube 2 by a set screw. The middle bearing 6 is pressed into the inner hole of the rear end of the front stern tube 7 and is fixedly connected to the front stern tube 7 by a set screw. The front bearing 8 is pressed into the inner hole of the front end of the front stern tube 7 and is fixedly connected to the front stern tube 7 by a set screw. The front end of the rear stern tube 2 and the rear end of the front stern tube 7 are connected by the loose-fitting joint 5.

[0025] In this invention, the stern tube 7 is fixed to the hull frame 100 by epoxy casting. The front and rear ends of the stern tube are respectively fixed to the inner holes of the rear axle hub 200 and the front axle hub 300 by epoxy casting. Epoxy casting generates virtually no heat, and the bearings are unlikely to deform, ensuring the coaxiality of the rear bearing 1, the middle bearing 6, and the front bearing 7. This ensures uniform contact between the stern tube and the three bearings, increasing their service life. Furthermore, due to hull construction errors, the relative positions of the hull frame 100, the rear axle hub 200, and the front axle hub 300 may change. By providing a loose-fitting joint 5, the axial position of the loose-fitting joint 5 and the stern tube 2 can be moved to adjust the overall length of the stern tube, thus compensating for hull construction errors.

[0026] This invention also includes a front flange 9, which is fixedly installed at the front end of the front stern tube 7 by screws, and a front sealing device 91 is installed on the front end face of the front flange 9. A rear sealing device 11 is installed on the rear end face of the rear bearing 1.

[0027] In this utility model, a sealing filler 3 and a packing gland 4 are also included. The packing gland 4 is fixedly connected to the rear end of the loose-fitting joint 5. The sealing filler 3 is filled between the packing gland 4 and the loose-fitting joint 5, thereby maintaining the reliability of the seal.

[0028] This utility model is mainly applied to 56.5m and 53m fishing boats. These fishing boats have a relatively flat stern, a stern support frame, and a long stern tube, therefore requiring front, middle, and rear bearings. During installation, the front stern tube 7 is installed in the hull using epoxy resin. The rear stern tube 2 passes through the inner hole of the hull support frame 100 and is connected to the front stern tube 7 using a loose-fitting connector 5. The front bearing 8 and middle bearing 6 are installed in the inner holes at the front and rear ends of the front stern tube 7, and the rear bearing 1 is installed in the inner hole at the rear end of the rear stern tube 2. The loose-fitting connector 5 is connected to the packing gland 4, with sealing packing 3 between them for sealing. The front flange 9 is installed at the front end of the front stern tube 7 and connected to the front sealing device 91; the rear sealing device 11 is installed on the rear end face of the rear stern tube 2. The telescopic marine stern tube provided by this utility model greatly improves the overall structure of the stern of the hull, making the stern tube more compatible with the stern structure of the hull, and making the overall structure of the stern tube more reliable and practical.

[0029] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0030] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this utility model also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A telescopic marine stern tube, comprising a rear stern tube (2) and a front stern tube (7) arranged sequentially from rear to front, characterized in that, The stern tube (2) is fixed in the hull frame (100) by epoxy casting. The front and rear ends of the stern tube (7) are fixed in the inner holes of the rear axle hub (200) and the front axle hub (300) of the hull by epoxy casting, respectively. It also includes a rear bearing (1), a loose-fitting joint (5), a middle bearing (6) and a front bearing (8). The rear bearing (1) is pressed into the inner hole of the rear end of the stern tube (2), the middle bearing (6) is pressed into the inner hole of the rear end of the stern tube (7), and the front bearing (8) is pressed into the inner hole of the front end of the stern tube (7). The front end of the stern tube (2) and the rear end of the stern tube (7) are connected by the loose-fitting joint (5).

2. A telescopic marine stern tube according to claim 1, characterized in that, It also includes a front flange (9), which is fixedly installed at the front end of the front stern tube (7), and a front sealing device (91) is installed at the front end face of the front flange (9).

3. A telescopic marine stern tube according to claim 2, characterized in that, The front flange (9) is fixedly connected to the front stern tube (7) by screws.

4. A telescopic marine stern tube according to claim 1, characterized in that, A rear sealing device (11) is installed at the rear end face of the rear bearing (1).

5. A telescopic marine stern tube according to claim 1, characterized in that, It also includes a sealing packing (3) and a packing gland (4), the packing gland (4) being fixedly connected to the rear end of the loose-fitting joint (5), and the sealing packing (3) being filled between the packing gland (4) and the loose-fitting joint (5).

6. A telescopic marine stern tube according to claim 1, characterized in that, The rear bearing (1) and the rear stern tube (2) are fixedly connected by set screws.

7. A telescopic marine stern tube according to claim 1, characterized in that, The middle bearing (6) and the front stern tube (7) are fixedly connected by set screws.

8. A telescopic marine stern tube according to claim 1, characterized in that, The front bearing (8) and the front stern tube (7) are fixedly connected by set screws.

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