A propulsion system power transmission shaft

Abstract

A kind of propulsion system power transmission shaft, including base shaft, work piece, fixed bolt, base shaft is connected with multiple work pieces using fixed bolt fixed, base shaft input flange is provided with mounting hole, mounting hole includes bearing area and fixed area, the fixed area is provided with limit hole, for fixed bolt fixed.The work piece is boss shape, including bearing section and fixed wing, hinge hole is arranged in bearing section, fixed wing is provided with step hole and top screw hole, for matching installation and removal.In some transmission shafts need to be reused scene, transmission shaft hinge hole is used after then cannot be assembled second time, need to be newly customized new transmission shaft to meet the hinge hole demand.Working piece and base shaft are combined to form transmission shaft, hinge hole only needs to be hinged to the hinge hole of working piece, when needing to be reused, replace working piece, transmission shaft can be hinged again, compared with transmission shaft body, working piece has low cost, short manufacturing time, replace simple, with good economic benefits.

Description

Technical Field

[0001] This invention relates to the field of drive shaft technology, and in particular to a power drive shaft for a propulsion system. Background Technology

[0002] The propulsion system mainly consists of the main engine, transmission equipment, shafting, and propellers. Its function is to transmit power from the main engine to the propellers via the transmission equipment and drive shafts to propel the ship. The drive shaft, connecting the transmission equipment and the propellers, plays a crucial role. Increased propulsion system power has led to a continuous increase in drive shaft diameter, often using forged blanks that are then precision-machined. During actual installation, after shaft alignment, to ensure torque transmission to the bolts at the flange connections and to prevent significant relative displacement of the connecting flanges during torque transmission, which could damage the bolts, it is necessary to ream the bolt holes on the drive shaft connecting flanges. Then, reamed bolts are selected based on the dimensions of the reamed holes.

[0003] Because the reaming process continuously enlarges the diameter of the working hole, the reaming of drive shafts is often irreversible, and the working hole must be reamed in one go. After reaming, the drive shaft can often only be used to meet the current working hole size. When the connecting flange of the transmission equipment is changed due to design changes or multiple transmission equipment need to be tested, the initial size of the working hole of the drive shaft may be too large to meet the connection function of the second transmission equipment. A new drive shaft needs to be reforged and machined. However, the drive shaft is long, heavy, has a long manufacturing time, and high cost, reducing economic efficiency and wasting resources. Summary of the Invention

[0004] In response to the shortcomings of the existing production technology, the applicant provides a power drive shaft for a propulsion system, which effectively solves the problem of drive shaft repeatability and greatly reduces costs.

[0005] The technical solution adopted in this invention is as follows:

[0006] A power transmission shaft for a propulsion system includes a base shaft, working parts, fixing bolts, and an output power shaft. Multiple working parts are mounted on the end face of the base shaft via fixing bolts. Each working part has a reamed hole. The multiple working parts are simultaneously connected to the output power shaft, which is connected to the reamed holes via reamed bolts and nuts. The base shaft has a structure including a connecting section. One end of the connecting section has an output flange, and the other end has an input flange. The input flange has multiple mounting holes that match the working parts. Each mounting hole includes a load-bearing area and a fixing area. A limiting hole is provided in the fixing area, and a fixing bolt is installed at the limiting hole.

[0007] Its further technical solution lies in:

[0008] The working part has a one-piece structure.

[0009] The working part is in the shape of a boss. The working part includes a load-bearing section and a fixed wing. The load-bearing section is provided with a hinge hole, and the fixed wing is provided with a stepped hole and a set screw hole. The stepped hole and the set screw hole are both used to install fixing bolts. The load-bearing section is installed in the load-bearing area, and the fixed wing is installed in the fixed area.

[0010] Both the load-bearing zone and the load-bearing section are waist-shaped.

[0011] A clearance fit is used between the load-bearing section and the load-bearing area.

[0012] The fixed wing and the fixed area are fitted with a clearance.

[0013] The number of mounting holes is 4-12, and the mounting holes are evenly distributed radially along the input flange.

[0014] The diameter and distribution of the reamed holes are determined based on the position and diameter of the holes on the output power shaft.

[0015] The input flange diameter D is 2 to 2.5 times the connecting section diameter d.

[0016] The height of the workpiece is consistent with the thickness of the input flange.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention features a compact and reasonable structure, and is easy to operate. It uses a working part and a base shaft to assemble a transmission shaft. During actual reaming, only the working hole on the working part is reamed, while the base shaft remains unchanged. When the transmission shaft needs to be reused, the working part can be customized according to the requirements. The working part is small in size, simple to process, low in cost, and has a short production cycle, thus solving the problem of non-repeatability of transmission shafts and saving time and manufacturing costs.

[0019] This invention effectively solves the problem of repeatability of drive shafts in the prior art. When the drive shaft needs to be used on a second output device or the diameter of the pitch circle of the reamer hole on the output flange of the output device changes, the original drive shaft cannot be reused and needs to be purchased again, which leads to a decrease in economic benefits and waste of resources. At the same time, the drive shaft has long manufacturing time and high cost. This invention solves the problem of repeatability of drive shafts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a schematic diagram of the basic shaft of the present invention.

[0023] Figure 4 for Figure 3 A-direction view.

[0024] Figure 5 for Figure 4 Full sectional view along section BB.

[0025] Figure 6 This is a top view of the working part of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the working part of the present invention.

[0027] Among them: 1. Basic axis;

[0028] 101. Output flange; 102. Connection section; 103. Input flange; 104. Mounting hole; 105. Limiting hole; 106. Load-bearing area; 107. Fixing area;

[0029] 2. Workpiece;

[0030] 201. Stepped hole; 202. Set screw hole; 203. Reamed hole; 204. Load-bearing section; 205. Fixed wing;

[0031] 3. Fixing bolts;

[0032] 4. Reamed bolts;

[0033] 5. Output power shaft;

[0034] 6. Nuts. Detailed Implementation

[0035] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] like Figures 1-7 As shown, the propulsion system power transmission shaft of this embodiment includes a base shaft 1, working parts 2, fixing bolts 3, and an output power shaft 5. Multiple working parts 2 are mounted on the end face of the base shaft 1 through fixing bolts 3. Each working part 2 is provided with a reaming hole 203. Multiple working parts 2 are connected to the output power shaft 5 at the same time. The output power shaft 5 is connected to the reaming hole 203 through reaming bolts 4 and nuts 6. The structure of the base shaft 1 is as follows: it includes a connecting section 102. One end of the connecting section 102 is provided with an output flange 101, and the other end of the connecting section 102 is provided with an input flange 103. Multiple mounting holes 104 matching the working parts 2 are opened on the input flange 103. The mounting holes 104 include a load-bearing area 106 and a fixing area 107. A limiting hole 105 is provided at the fixing area 107, and a fixing bolt 3 is installed at the limiting hole 105.

[0037] Workpiece 2 is a one-piece structure.

[0038] The working part 2 is in the shape of a boss. The working part 2 includes a load-bearing section 204 and a fixed wing 205. The load-bearing section 204 is provided with a hinge hole 203, and the fixed wing 205 is provided with a stepped hole 201 and a set screw hole 202. Both the stepped hole 201 and the set screw hole 202 are equipped with fixing bolts 3. The load-bearing section 204 is installed in the load-bearing area 106, and the fixed wing 205 is installed in the fixed area 107.

[0039] Both the load-bearing zone 106 and the load-bearing section 204 are waist-shaped.

[0040] The load-bearing section 204 and the load-bearing zone 106 are fitted with a clearance.

[0041] The fixed wing 205 and the fixed area 107 are fitted with a clearance.

[0042] The number of mounting holes 104 is 4-12, and the mounting holes 104 are evenly distributed radially along the input flange 103.

[0043] The diameter and distribution of the reamed hole 203 are determined based on the position and diameter of the hole in the output power shaft 5.

[0044] The diameter D of the input flange 103 is 2 to 2.5 times the diameter d of the connecting section 102.

[0045] The height of workpiece 2 is consistent with the thickness of input flange 103.

[0046] The thread of the limiting hole 105 is the same as the thread of the set screw hole 202 on the working part 2.

[0047] The length of the mounting hole 104 is aligned with the radial direction of the input flange 103.

[0048] The load-bearing area 106 of the mounting hole 104 and the load-bearing section 204 of the working piece 2 are cylindrical in shape.

[0049] The specific structure and function of the propulsion system power transmission shaft described in this invention are as follows:

[0050] like Figure 1 As shown, the propulsion system power transmission shaft in this embodiment is used to connect the transmission equipment and the propeller or power dissipation equipment for power transmission. Figure 1 The main focus is on demonstrating the final configuration of the shaft using this structure connected to the output power shaft 5 in the embodiment.

[0051] Figure 2 The diagram illustrates the fit between the base shaft 1, the working part 2, the fixing bolts 3, the output power shaft 5, the reamer bolts 4, and the nut 6. The base shaft 1 and the working part 2 are connected by four fixing bolts 3, and the working part 2 has reamer holes 203.

[0052] Figure 3 , Figure 4and Figure 5 The structure of the base shaft 1 is shown. The base shaft 1 consists of an output flange 101, a connecting section 102, and an input flange 103. The input flange 103 has a certain number of concave holes for installing the working part 2; the number of holes is determined by the connecting flange of the matching transmission equipment. The diameter D of the input flange 103 is 2 to 2.5 times the diameter d of the connecting section 102, allowing for adjustment margins. However, it should not be too large, otherwise stress concentration will occur in the transmission shaft during torque transmission, leading to damage. The load-bearing area 106 is a slotted hole, with its length distributed along the radial direction of the input flange 103. The length L of the slotted hole is 0.8-1.2 times the radius R of the slotted hole circle.

[0053] The load-bearing area 106 and the fixing area 107 of the mounting hole 104 mate with the load-bearing section 204 and the fixing wing 205 of the working piece 2, respectively. Reamed holes 203 are arranged on the load-bearing section 204. By changing the distribution position of the reamed holes 203 on the working piece 2 and the radius r2 of the reamed holes 203, they mate with the connecting holes on the power output shaft flange. The working piece 2 has a fixing wing 205, which has stepped holes 201 for installing fixing bolts 3. The thickness of the fixing wing 205 is 1.4 to 1.6 times the thickness of the bolt head of the fixing bolt 3. The height of the working piece 2 is consistent with the thickness of the input flange 103 of the base shaft 1. The fixing wing 205 also has a set screw hole 202. The thread of the set screw hole 202 is the same as the thread specification of the fixing bolt 3. When the drive shaft is replaced, the working piece 2 can be removed and replaced with a new working piece 2 by loosening the fixing bolt 3 and screwing the fixing bolt 3 into the set screw hole 202, making replacement convenient. The radius r2 of the reamed hole 203 shall not exceed 0.8 times the radius r1 of the top end of the workpiece.

[0054] In other embodiments of the drive shaft, the fixed area 107 of the base shaft 1 and the load-bearing section 204 of the working part 2 can also be in other shapes such as circles.

[0055] In this invention, a power transmission shaft for a propulsion system is proposed, in which the base shaft 1 is the main body of the transmission shaft and serves as the mounting base for the working part 2. In some scenarios where the transmission shaft needs to be reused, once the reaming hole is used, it cannot be reassembled, requiring a new transmission shaft to be custom-made to meet the reaming requirements. In this invention, the working part 2 and the base shaft 1 combine to form the transmission shaft. During reaming, only the reaming hole 203 of the working part 2 needs to be reamed. When reuse is required, the working part 2 is replaced, and the transmission shaft can be re-reamed to meet the usage conditions. Compared with the transmission shaft body, the working part 2 has lower cost, shorter manufacturing time, and simpler replacement, resulting in good economic benefits.

[0056] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A power transmission shaft for a propulsion system, characterized in that: The assembly includes a base shaft (1), working parts (2), fixing bolts (3), and an output power shaft (5). Multiple working parts (2) are mounted on the end face of the base shaft (1) via fixing bolts (3). Each working part (2) has a reamed hole (203). Multiple working parts (2) are simultaneously connected to the output power shaft (5), which is connected to the reamed hole (203) via reamed bolts (4) and nuts (6). The base shaft (1) has the following structure: a connecting section (102), one end of which has an output flange (101), and the other end of which has an input flange (103). The input flange (103) has multiple openings that match the working parts (2). Mounting hole (104), the mounting hole (104) includes a load-bearing area (106) and a fixing area (107), the fixing area (107) is provided with a limiting hole (105), and a fixing bolt (3) is installed at the limiting hole (105); the working part (2) is in the shape of a boss, the working part (2) includes a load-bearing section (204) and a fixing wing (205), the load-bearing section (204) is provided with a hinge hole (203), the fixing wing (205) is provided with a step hole (201) and a set screw hole (202), and a fixing bolt (3) is installed at both the step hole (201) and the set screw hole (202); the load-bearing section (204) is installed in the load-bearing area (106), and the fixing wing (205) is installed in the fixing area (107).

2. The power transmission shaft for a propulsion system as described in claim 1, characterized in that: The working part (2) is an integral structure.

3. The power transmission shaft for a propulsion system as described in claim 1, characterized in that: Both the load-bearing area (106) and the load-bearing section (204) are waist-shaped.

4. The power transmission shaft for a propulsion system as described in claim 1, characterized in that: The load-bearing section (204) and the load-bearing area (106) are fitted with a clearance.

5. A power transmission shaft for a propulsion system as described in claim 1, characterized in that: The fixed wing (205) and the fixed area (107) are fitted with a clearance.

6. The power transmission shaft for a propulsion system as described in claim 1, characterized in that: The number of mounting holes (104) is 4-12, and the mounting holes (104) are evenly distributed radially along the input flange (103).

7. A power transmission shaft for a propulsion system as described in claim 1, characterized in that: The diameter and distribution of the reamed hole (203) are determined based on the position and diameter of the hole in the output power shaft (5).

8. A power transmission shaft for a propulsion system as described in claim 1, characterized in that: The diameter D of the input flange (103) is 2 to 2.5 times the diameter d of the connecting section (102).

9. A power transmission shaft for a propulsion system as described in claim 1, characterized in that: The height of the working part (2) is consistent with the thickness of the input flange (103).

Images