Hydraulic nut mounting tool for propeller shaft

Abstract

The application relates to a hydraulic nut mounting tool for a propeller shaft, which comprises an inner ring tool for fixing a hydraulic nut, an outer ring tool rotatably sleeved on the inner ring tool and having a gap with the inner ring tool, and a plurality of rolling bearings mounted on the outer ring tool and arranged at intervals along the circumference of the inner ring tool, the outer circumferential surface of each rolling bearing abutting against the outer circumferential surface of the inner ring tool. The hydraulic nut mounting tool for the propeller shaft can convert sliding friction into rolling friction by arranging the rolling bearings between the inner ring tool and the outer ring tool, thereby greatly reducing the friction resistance when the inner ring tool rotates relative to the outer ring tool.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a hydraulic nut mounting fixture for a stern shaft. Background Technology

[0002] During shipbuilding, the stern shaft and propeller are typically connected by a large hydraulic nut. Due to the large size and heavy weight of the hydraulic nut, installation is usually accomplished using specialized tooling. Existing hydraulic nut installation tooling typically consists of two parts: an inner ring tooling and an outer ring tooling. The inner ring tooling is used to fix the hydraulic nut, while the outer ring tooling is used to suspend the hydraulic nut onto the stern shaft end face via hoisting equipment. Then, the hydraulic nut is manually screwed into the stern shaft by pulling the pin on the inner ring tooling that is connected to the hydraulic nut.

[0003] However, due to the large friction between the outer and inner ring tooling, especially when installing large hydraulic nuts, the large rotational torque that needs to be overcome makes the operation extremely time-consuming and labor-intensive; in addition, the large sliding friction can easily cause wear on the tooling surface, affecting the installation accuracy and the tooling service life. Summary of the Invention

[0004] Therefore, it is necessary to provide a hydraulic nut mounting fixture for tail shafts to address the problem of high friction between the inner and outer ring fixtures in existing hydraulic nut mounting fixtures for tail shafts.

[0005] The tail shaft hydraulic nut mounting fixture of this application includes: an inner ring fixture for fixing the hydraulic nut; an outer ring fixture rotatably fitted onto the inner ring fixture with a gap between them; and a plurality of rolling bearings mounted on the outer ring fixture and arranged at circumferential intervals along the inner ring fixture, with the outer circumferential surface of each rolling bearing abutting against the outer circumferential surface of the inner ring fixture.

[0006] In one embodiment, the outer ring body has a plurality of mounting holes that extend axially. The outer ring fixture includes the outer ring body and a plurality of bearing fasteners. The outer ring body has a plurality of mounting holes that extend axially. The bearing fasteners are respectively inserted into the mounting holes. The rolling bearing is fitted onto the bearing fasteners so as to be rotatably mounted on both sides of the outer ring body via the bearing fasteners.

[0007] In one embodiment, the bearing fixing component includes a fixing bolt and a fixing nut, the fixing bolt being axially inserted through the mounting hole, and the fixing nut being fixed to the threaded end of the fixing bolt, so as to rotatably mount the rolling bearing to both axial sides of the outer ring body.

[0008] In one embodiment, the outer ring tooling further includes a plurality of bushings fitted onto the bearing fixture and located between the rolling bearing and the outer ring body.

[0009] In one embodiment, the inner ring fixture includes an inner ring body, a nut mounting ring body, and a plurality of nut fasteners. The outer ring body is rotatably fitted onto the inner ring body. The nut mounting ring body is fixed to the inner ring body. The nut mounting ring body has a plurality of fixing holes extending radially. The plurality of fixing holes are spaced apart circumferentially along the nut mounting ring body. The nut fasteners pass through the fixing holes for fixed connection with the hydraulic nut.

[0010] In one embodiment, the inner ring body includes two inner track rings with mounting grooves, the nut mounting ring is fixed in the mounting groove, and the two inner track rings are connected at intervals.

[0011] In one embodiment, the inner ring body further includes two limiting steps that are respectively protruding from the outer periphery of the two inner track rings, and the limiting steps are distributed axially between the rolling bearings.

[0012] In one embodiment, the outer ring tooling further includes an eye plate portion fixed to the outer ring body, the eye plate portion having a hook hole for the hook of the crane to pass through.

[0013] In one embodiment, the outer ring body includes two outer track rings and a plurality of ribs fixed between the outer track rings.

[0014] In one embodiment, the eye plate portion includes a connecting portion fixed between the two outer track rings and a hook portion connected to the connecting portion, wherein the hook hole is formed in the hook portion.

[0015] The hydraulic nut mounting fixture for the tail shaft of this application can convert sliding friction into rolling friction by setting a rolling bearing between the inner ring fixture and the outer ring fixture, which greatly reduces the frictional resistance when the inner ring body rotates relative to the outer ring body. Attached Figure Description

[0016] Figure 1 A schematic diagram of a hydraulic nut mounting fixture for a tail shaft provided in one embodiment of this application; Figure 2 A side view schematic diagram of a hydraulic nut mounting fixture for a tail shaft according to the above embodiments of this application is shown; Figure 3 A cross-sectional schematic diagram of a hydraulic nut mounting fixture for a tail shaft according to the above embodiments of this application is shown; Figure 4 As shown Figure 3 A partial enlarged schematic diagram of part A of the hydraulic nut mounting fixture for the tail shaft shown; Figure 5 A schematic diagram of the inner ring fixture of the tail shaft hydraulic nut mounting fixture according to the above embodiments of this application is shown; Figure 6 A schematic diagram of the outer ring body of the tail shaft hydraulic nut mounting fixture according to the above embodiments of this application is shown; Figure 7 A schematic diagram of the eye plate portion of the hydraulic nut mounting fixture for the tail shaft according to the above embodiment of this application is shown.

[0017] Figure label: 10. Inner ring fixture; 11. Inner ring body; 111. Inner track ring body; 112. Mounting groove; 113. Limiting step; 12. Nut mounting ring body; 121. Fixing hole; 13. Nut fastener; 20. Outer ring fixture; 21. Outer ring body; 211. Mounting hole; 212. Outer track ring body; 213. Rib plate; 22. Bearing fastener; 23. Bushing; 24. Eye plate; 241. Hook hole; 242. Connecting part; 243. Hook part; 30. Rolling bearing. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this invention, 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 part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] To address the issue of high friction between the inner and outer ring fixtures in existing tail shaft hydraulic nut installation fixtures, this application provides a tail shaft hydraulic nut installation fixture. This fixture introduces multiple rolling bearings as intermediate rolling support elements between the inner and outer ring fixtures. By utilizing the rolling action of the rolling bearings, the sliding friction in the traditional structure is transformed into rolling friction, thereby significantly reducing the frictional resistance between the inner and outer rings. This makes the screwing in of the hydraulic nut easier and less strenuous, while also reducing fixture wear and extending its service life.

[0025] Specifically, please refer to Figure 1 , Figure 2 and Figure 3 The hydraulic nut mounting fixture for the tail shaft of this application may include an inner ring fixture 10, an outer ring fixture 20, and rolling bearings 30. The inner ring fixture 10 is used to fix the hydraulic nut, so that the hydraulic nut and the inner ring fixture 10 form a synchronously rotatable whole. The outer ring fixture 20 is rotatably fitted onto the inner ring fixture 10, and there is a gap between the two, that is, the outer ring fixture 20 and the inner ring fixture 10 are not in direct contact, and a gap is reserved between them to avoid the generation of sliding friction. Multiple rolling bearings 30 are mounted on the outer ring fixture 20 and arranged at intervals along the circumference of the inner ring fixture 10, and the outer circumferential surface of each rolling bearing 30 abuts against the outer circumferential surface of the inner ring fixture 10. Through the rolling action of the rolling bearings 30, rolling friction contact is formed between the outer ring fixture 20 and the inner ring fixture 10. When the inner ring fixture 10 rotates, the rolling bearing 30 rotates around its own axis and rolls around the outer circumference of the inner ring fixture 10, thereby allowing the inner ring fixture 10 to rotate smoothly relative to the outer ring fixture 20.

[0026] Understandably, compared to traditional sliding friction contact, the hydraulic nut mounting fixture for the tail shaft of this application, by setting a rolling bearing 30 between the inner ring fixture 10 and the outer ring fixture 20, can convert sliding friction into rolling friction, significantly reducing the frictional resistance when the inner ring fixture 10 rotates relative to the outer ring fixture 20. On the one hand, when installing large hydraulic nuts, operators only need a small force to drive the inner ring fixture 10 to rotate, significantly reducing labor intensity. On the other hand, the rolling contact method also greatly reduces wear on the fixture surface, extends the service life of the fixture, and ensures installation accuracy for long-term use.

[0027] More specifically, such as Figure 3 and Figure 6As shown, in some embodiments, the outer ring fixture 20 includes an outer ring body 21 and multiple bearing fasteners 22. The outer ring body 21 has multiple axially extending mounting holes 211. The bearing fasteners 22 are respectively inserted into the mounting holes 211. The rolling bearing 30 is fitted onto the bearing fasteners 22, thereby being rotatably mounted on both axial sides of the outer ring body 21 via the bearing fasteners 22. Thus, by opening mounting holes 211 on the outer ring body 21 and using the bearing fasteners 22 to fix the rolling bearing 30, the installation and removal of the rolling bearing 30 are made more convenient. When the rolling bearing 30 wears out after long-term use and needs to be replaced, the rolling bearing 30 can be quickly replaced simply by removing the bearing fasteners 22, reducing maintenance costs and improving the maintenance convenience of the fixture. In addition, by providing rolling bearings 30 on both sides of the outer ring body 21 in the axial direction, the weight of the inner ring body 11 and the hydraulic nut carried by the inner ring body 11 can be shared, which effectively avoids the problem of uneven load and tilting that may be caused by unilateral support, so that the inner ring body 11 remains stable during rotation, and ensures that the hydraulic nut is accurately positioned when screwed into the tail shaft, thereby improving the installation accuracy.

[0028] Optionally, in some embodiments, the bearing retainer 22 includes a retaining bolt and a retaining nut. The retaining bolt passes through the mounting hole 211 axially, and the retaining nut is fixed to the threaded end of the retaining bolt, thereby rotatably mounting the rolling bearing 30 to both axial sides of the outer ring body 21. Thus, using a retaining bolt and a retaining nut as the bearing retainer 22 not only results in a simple structure, low cost, and convenient installation, but also provides reliable fastening, ensuring the stability of the rolling bearing 30 during rotation.

[0029] Preferably, such as Figure 3 and Figure 4 As shown, in some embodiments, the outer ring fixture 20 further includes multiple bushings 23, which are fitted onto the bearing retainer 22 and located between the rolling bearing 30 and the outer ring body 21. In this way, the bushings 23 maintain an appropriate distance between the rolling bearing 30 and the outer ring body 21, preventing unnecessary friction caused by direct contact between the axial end face of the rolling bearing 30 and the axial end face of the outer ring body 21. This effectively protects the outer ring body 21, reduces wear between the rolling bearing 30 and the outer ring body 21, and extends the service life of both.

[0030] Optionally, in some embodiments, the hydraulic nut mounting fixture for the tail shaft may include 16 rolling bearings 30. The outer ring body 21 has 8 mounting holes 211, each corresponding to 2 rolling bearings 30. These bearings are fixed to both sides of the outer ring body 21 by bearing fasteners 22, forming multiple points of uniform support between the outer ring body 21 and the inner ring fixture 10. Even for hydraulic nuts weighing up to 2 tons, operators can easily screw the hydraulic nuts into the tail shaft with the help of the inner ring fixture 10, effectively reducing labor intensity and installation difficulty.

[0031] Furthermore, such as Figure 3 As shown, in some embodiments, the inner ring fixture 10 includes an inner ring body 11, a nut mounting ring 12, and multiple nut fasteners 13. The outer ring body 21 is rotatably fitted onto the inner ring body 11. The nut mounting ring 12 is fixed to the inner ring body 11. The nut mounting ring 12 has multiple radially extending fixing holes 121, which are spaced apart circumferentially along the nut mounting ring 12. The nut fasteners 13 pass through the fixing holes 121 for fixed connection with the hydraulic nut. In this way, by firmly fixing the hydraulic nut to the nut mounting ring 12 with the nut fasteners 13, it can be ensured that the hydraulic nut and the inner ring fixture 10 rotate synchronously during installation. Furthermore, the nut fasteners 13 can also be used as a wrench to drive the inner ring body 11 to rotate. By turning the nut fasteners 13, the operator can drive the inner ring body 11 and the hydraulic nut to rotate.

[0032] Optionally, such as Figure 4 and Figure 5 As shown, in some embodiments, the inner ring body 11 includes two inner track rings 111 with mounting grooves 112. A nut mounting ring 12 is fixed within the mounting grooves 112, and the two inner track rings 111 are connected at intervals. This design of the inner ring body 11 as a split structure consisting of two inner track rings 111 and a nut mounting ring 12 facilitates the processing and manufacturing of the inner ring body 11, reducing production difficulty and cost. The nut mounting ring 12 serves to connect the two inner track rings 111 and can be welded to each of them, resulting in a more compact overall structure and a more reliable connection.

[0033] It is worth noting that the hydraulic nut mounting fixture for the tail shaft of this application can be designed according to the inner diameter of the nut mounting ring body 12 of the inner ring fixture 10, so that the fixture can be used for hydraulic nuts within a certain range.

[0034] Optionally, such as Figure 3 and Figure 4As shown, in some embodiments, the inner ring body 11 further includes two limiting steps 113 that are respectively protruding from the outer periphery of the two inner track ring bodies 111. The limiting steps 113 are distributed axially between the rolling bearings 30, which can restrict the inner ring fixture 10 between the two rolling bearings 30 in the axial direction and prevent the inner ring body 11 from detaching from the outer ring fixture 20 during rotation.

[0035] Optionally, in some embodiments, the nut retainer 13 can be a pin. By passing the pin through the fixing hole 121 and inserting it into the pin hole of the hydraulic nut, and securing it with fasteners, the hydraulic nut can be fixed to the inner ring body 11. The portion of the pin remaining outside the nut mounting ring body 12 can serve as a wrench to rotate the inner ring body 11 for the operator to turn.

[0036] Furthermore, such as Figure 2 and Figure 3 As shown, in some embodiments, the outer ring fixture 20 also includes an eye plate portion 24 fixed to the outer ring body 21. The eye plate portion 24 has a hook hole 241 for the hook of the crane to pass through, so that the outer ring fixture 20 is suspended on the crane, thereby aligning the hydraulic nut installed on the inner ring fixture 10 with the tail shaft end face, and realizing the screw-in installation of the hydraulic nut.

[0037] Optionally, such as Figure 6 As shown, in some embodiments, the outer ring body 21 includes two outer track rings 212 and multiple ribs 213 fixed between the outer track rings 212. In this way, the two outer track rings 212 are connected into one unit by the ribs 213, which effectively reduces the overall weight of the outer ring body 21 while ensuring that the outer ring body 21 has sufficient structural rigidity and load-bearing capacity, thereby reducing the load on the crane during hoisting and reducing the hoisting difficulty of the installation tools.

[0038] Optionally, such as Figure 7 As shown, in some embodiments, the eye plate portion 24 includes a connecting portion 242 fixed between two outer track rings 212 and a hook portion 243 connected to the connecting portion 242, with a hook hole 241 formed in the hook portion 243. Thus, by fixing the connecting portion 242 between the two outer track rings 212, the tension applied by the crane to the hook portion 243 can be evenly distributed and transmitted to the two outer track rings 212 via the connecting portion 242, avoiding uneven loading and tilting of the outer ring body 21 during hoisting. The connecting portion 242 is typically fixed to the outer track rings 212 by welding, ensuring sufficient connection strength and structural integrity between the eye plate portion 24 and the outer ring body 21.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hydraulic nut mounting fixture for a tail shaft, characterized in that, include: Inner ring fixture, the inner ring fixture being used to fix the hydraulic nut; An outer ring fixture, rotatably fitted onto an inner ring fixture, with a gap between the outer ring fixture and the inner ring fixture; and Multiple rolling bearings are mounted on the outer ring fixture and arranged at circumferential intervals along the inner ring fixture, with the outer circumferential surface of each rolling bearing abutting against the outer circumferential surface of the inner ring fixture.

2. The hydraulic nut mounting fixture for the tail shaft according to claim 1, characterized in that, The outer ring fixture includes an outer ring body and multiple bearing fasteners. The outer ring body has multiple mounting holes that extend along the axial direction. The bearing fasteners are respectively inserted into the mounting holes. The rolling bearings are fitted onto the bearing fasteners so as to be rotatably mounted on both sides of the outer ring body via the bearing fasteners.

3. The hydraulic nut mounting fixture for the tail shaft according to claim 2, characterized in that, The bearing fixing component includes a fixing bolt and a fixing nut. The fixing bolt passes through the mounting hole along the axial direction, and the fixing nut is fixed to the threaded end of the fixing bolt, so as to rotatably install the rolling bearing on both sides of the outer ring body.

4. The hydraulic nut mounting fixture for the tail shaft according to claim 2, characterized in that, The outer ring tooling also includes multiple bushings, which are fitted onto the bearing fixing member and located between the rolling bearing and the outer ring body.

5. The hydraulic nut mounting fixture for the tail shaft according to any one of claims 2 to 4, characterized in that, The inner ring fixture includes an inner ring body, a nut mounting ring body, and multiple nut fasteners. The outer ring body is rotatably fitted onto the inner ring body. The nut mounting ring body is fixed to the inner ring body. The nut mounting ring body has multiple fixing holes extending radially. The multiple fixing holes are spaced apart circumferentially along the nut mounting ring body. The nut fasteners pass through the fixing holes for fixed connection with the hydraulic nut.

6. The hydraulic nut mounting fixture for the tail shaft according to claim 5, characterized in that, The inner ring body includes two inner track rings with mounting grooves. The nut mounting ring is fixed in the mounting groove and connects the two inner track rings at intervals.

7. The hydraulic nut mounting fixture for the tail shaft according to claim 6, characterized in that, The inner ring body also includes two limiting steps that are respectively protruding from the outer periphery of the two inner track rings, and the limiting steps are distributed axially between the rolling bearings.

8. The hydraulic nut mounting fixture for the tail shaft according to any one of claims 2 to 4, characterized in that, The outer ring tooling also includes an eye plate portion fixed to the outer ring body, the eye plate portion having a hook hole for the hook of the crane to pass through.

9. The hydraulic nut mounting fixture for the tail shaft according to claim 8, characterized in that, The outer ring body includes two outer track rings and multiple ribs fixed between the outer track rings.

10. The hydraulic nut mounting fixture for the tail shaft according to claim 9, characterized in that, The eye plate includes a connecting part fixed between the two outer track rings and a hook part connected to the connecting part, and the hook hole is opened in the hook part.

Images