Split type gear ring of gas engine and disassembly and assembly method

Abstract

The invention discloses a split type gear ring of a gas engine and a disassembly and assembly method, and belongs to the technical field of engine maintenance, the split type gear ring comprises a first half gear ring and a second half gear ring, the first half gear ring and the second half gear ring are the same in structure and are segmented along the tooth root, and the first half gear ring and the second half gear ring are jointly spliced to form a complete annular gear ring; the first half gear ring and the second half gear ring are detachably connected with the fasteners through the connecting parts at the butt joint positions and jointly spliced into the complete gear ring, the connecting parts are provided with connecting and positioning structures, and the whole circle precision after splicing is ensured; an assembly positioning structure matched with an assembly positioning pin on the flywheel is further arranged, and accurate positioning of the gear ring on the flywheel in the radial direction and the circumferential direction is achieved. By adopting the split type gear ring structure, the gear ring can be quickly, safely and conveniently replaced by using a conventional tool on an equipment site under the condition that an engine and a flywheel are not disassembled.

Description

Technical Field

[0001] This invention relates to the field of engine maintenance technology, specifically to a method for disassembling and assembling a split gear ring for a gas engine. Background Technology

[0002] The flywheel ring gear of a gas engine is a key transmission component that meshes with the starter gear. It transmits torque through meshing, driving the engine crankshaft to rotate and thus starting the engine. The traditional ring gear is an integral circular structure, which is assembled to the outer edge of the flywheel by interference fit or fixed to the flywheel by circumferentially distributed bolts. After long-term use, the tooth surface of the ring gear is prone to wear and needs to be replaced. When the ring gear needs to be replaced due to wear, the following steps must be performed: First, lift the engine from the unit and remove the connected generator or other accessories to obtain operating space. Then, remove the connecting bolts between the flywheel and the crankshaft and remove the flywheel together with the ring gear. After that, use tools to separate the ring gear from the flywheel. When installing a new ring gear, it is necessary to align and assemble it, retighten the bolts, and finally reset the flywheel and engine.

[0003] Based on the existing technology, the following technical problems exist: First, the disassembly and assembly process requires the removal of the engine and flywheel, which is cumbersome, labor-intensive, and highly dependent on on-site hoisting equipment; second, the integral gear ring is difficult to disassemble and is prone to damage to the gear ring or flywheel due to improper operation, increasing the cost of parts replacement; in addition, maintenance takes a long time, affecting the continuous operation of the equipment, and there are safety risks in on-site hoisting operations. Summary of the Invention To address the problems existing in the prior art, this invention provides a split gear ring for a gas engine and a method for its assembly and disassembly. By adopting a split gear ring structure, the gear ring can be quickly, safely, and conveniently replaced on-site using conventional tools without disassembling the engine and flywheel.

[0004] The technical solution of the present invention is as follows: In a first aspect of the present invention, a split gear ring for a gas engine is provided, comprising a first half gear ring and a second half gear ring, wherein the first half gear ring and the second half gear ring have the same structure and are both divided along the tooth root, and are spliced ​​together to form a complete annular gear ring; a connecting portion is provided at the joint of the first half gear ring and the second half gear ring, the connecting portion is provided with a connecting hole, and a fastener is provided in the connecting hole, wherein the fastener is provided through the connecting hole to detachably connect the first half gear ring and the second half gear ring into one piece; The connection part of the first half gear ring and the second half gear ring is provided with a connection positioning structure and an assembly positioning structure. The connection positioning structure is used to ensure the full circle accuracy after the first half gear ring and the second half gear ring are spliced. An assembly positioning pin is provided on the flywheel. The assembly positioning structure is adapted to the assembly positioning pin to realize the radial and circumferential positioning of the first half gear ring and the second half gear ring on the flywheel. In some embodiments of the present invention, the fastener includes a connecting bolt passing through the connecting hole, and connecting nuts are installed at both ends of the connecting bolt. In some embodiments of the present invention, two symmetrically distributed weight-reducing holes are respectively provided at the position of the first half-gear ring corresponding to the connecting nut. The weight-reducing holes are provided through the thickness direction of the first half-gear ring, and the size of the weight-reducing holes is configured to allow a standard wrench tool to be inserted to operate the connecting nut. At the position of the second half gear ring corresponding to the connecting nut, two symmetrically distributed weight-reducing holes are respectively opened. The weight-reducing holes are arranged through the thickness direction of the second half gear ring. The size of the weight-reducing holes is configured to allow a standard wrench tool to be inserted to operate the connecting nut. After the connecting bolt passes through the connecting hole, both ends of the connecting bolt pass through the weight reduction holes located in the first half gear ring and the second half gear ring, respectively, and the connecting nut is set in the weight reduction hole. In some embodiments of the present invention, a pad is provided between the connecting nut and the inner contour of the weight reduction hole, and the side of the pad near the weight reduction hole is configured with an arc-shaped structure to match the inner contour of the weight reduction hole. In some embodiments of the present invention, the connection positioning structure includes a connection positioning pin disposed on the first half-gear ring connection portion and a connection positioning pin hole disposed on the second half-gear ring connection portion that cooperates with the connection positioning pin. Alternatively, it may include a connecting positioning pin hole provided on the first half gear ring connecting part and a connecting positioning pin provided on the second half gear ring connecting part that mates with the connecting positioning pin hole. Alternatively, it may include connecting positioning pin holes disposed on the first half gear ring connecting part and the second half gear ring connecting part, and connecting positioning pins that cooperate with the connecting positioning pin holes, wherein the two ends of the connecting positioning pins are respectively disposed in the connecting positioning pin holes on the first half gear ring connecting part and the second half gear ring connecting part. In some embodiments of the present invention, the connecting positioning pin and the connecting positioning pin hole adopt a transition fit. In some embodiments of the present invention, the assembly positioning structure includes: assembly positioning grooves symmetrically arranged at the connection portion of the first half gear ring and the second half gear ring, the assembly positioning grooves of the first half gear ring and the second half gear ring being joined together to form an assembly positioning pin hole, the assembly positioning pin hole being adapted to the assembly positioning pin. In some embodiments of the present invention, the first half gear ring and the second half gear ring are provided with a plurality of lifting holes. In some embodiments of the present invention, the first half-gear ring and the second half-gear ring are detachably connected to the flywheel by a plurality of mounting bolts. In a second aspect of the invention, a method for disassembling and assembling a split gear ring for a gas engine is provided, including an installation process and a disassembly process. The installation process includes: cleaning the flywheel end face and the inner hole mating surfaces of the first half gear ring and the second half gear ring to be installed; aligning the first half gear ring with the assembly positioning pin on the flywheel through the assembly positioning structure; and using mounting bolts to pre-position and pre-tighten the first half gear ring and the flywheel. Insert the connecting bolt into the connecting through hole of the first half gear ring, and install the pad and connecting nut in the weight reduction hole of the first half gear ring. Hoist the second half gear ring to the assembly position and align it with the connecting part of the already positioned first half gear ring. Connect the second half gear ring to the assembly positioning pin on the flywheel through the assembly positioning structure. Let the other end of the connecting bolt pass through the connecting through hole of the second half gear ring. The connecting positioning pin engages with the connecting positioning pin hole. Install the pad and connecting nut in the weight reduction hole of the second half gear ring. Use the mounting bolt to pre-position and pre-tighten the second half gear ring and the flywheel. Tighten all mounting bolts connecting the first and second half gear rings to the flywheel to the specified torque in the set sequence to complete the installation; The disassembly process includes: loosening all mounting bolts connecting the first half-gear ring and the second half-gear ring to the flywheel in a set sequence with a set torque; removing the mounting bolts on the first half-gear ring; loosening and removing the pad and connecting nut installed in the weight reduction hole of the first half-gear ring; removing the first half-gear ring along the axial direction of the connecting bolts; then loosening and removing the pad, connecting nut, and connecting bolt installed in the weight reduction hole of the second half-gear ring; removing the mounting bolts on the second half-gear ring; and finally removing the second half-gear ring to complete the disassembly.

[0005] One or more technical solutions of the present invention have the following beneficial effects: Firstly, this invention completely changes the installation paradigm by adopting a split structure composed of a first half-gear ring and a second half-gear ring, combined with the use of a connecting positioning structure for mutual positioning and an assembly positioning structure for positioning and connection with the flywheel. This eliminates the need for maintenance personnel to lift the engine from the unit or disassemble the flywheel, reducing reliance on heavy lifting equipment. Gear ring disassembly and assembly operations can be performed directly on-site, greatly simplifying the disassembly and assembly process and reducing the corresponding safety risks when using lifting equipment. The connecting positioning structure and the assembly positioning structure ensure quick and accurate alignment during splicing and installation, avoiding repeated adjustments and ensuring the accuracy of disassembly and assembly operations. The overall disassembly and assembly method is simpler than traditional methods, avoiding damage to the gear ring or flywheel caused by the use of pullers and hydraulic tools during traditional disassembly and assembly processes, significantly reducing the risk of parts damage and replacement costs.

[0006] In addition, the position and size of the weight reduction hole not only allow for weight reduction of the gear ring, but also provide a convenient channel for operating the connecting nut. The shim not only enhances the connection reliability between the connecting nut and the connecting bolt, but also the arc contour of the shim and the weight reduction hole can prevent connection damage to the gear ring body during tightening. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a split-type gear ring and flywheel for a gas engine provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the first half-gear ring provided in Embodiment 1 of the present invention; Figure 3 This is an assembly diagram of a split gear ring and flywheel for a gas engine provided in Embodiment 1 of the present invention.

[0008] In the diagram: 1. First half gear ring; 2. Connecting bolt; 3. Connecting nut; 4. Washer block; 5. Connecting positioning pin; 6. Second half gear ring; 7. Mounting bolt; 8. Flywheel; 9. Lifting hole; 10. Assembly positioning pin; 11. Assembly positioning groove; 12. Connecting hole; 13. Connecting positioning pin hole; 14. Weight reduction hole. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0010] Example 1 In a typical embodiment of the present invention, such as Figures 1 to 3 As shown, a split gear ring for a gas engine is proposed, comprising a first half gear ring 1 and a second half gear ring 6. The first half gear ring 1 and the second half gear ring 6 have the same structure and are both divided along the tooth root, and are spliced ​​together to form a complete annular gear ring. A connecting part is provided at the joint of the first half gear ring 1 and the second half gear ring 6. The connecting part is provided with a connecting hole 12. A fastener is provided in the connecting hole 12. The fastener detachably connects the first half gear ring 1 and the second half gear ring 6 into one piece by passing through the connecting hole 12. The connection part of the first half gear ring 1 and the second half gear ring 6 is provided with a connection positioning structure and an assembly positioning structure. The connection positioning structure is used to ensure the full circle accuracy after the first half gear ring 1 and the second half gear ring 6 are spliced. An assembly positioning pin 10 is provided on the flywheel 8. The assembly positioning structure is adapted to the assembly positioning pin 10 to realize the radial and circumferential positioning of the first half gear ring 1 and the second half gear ring 6 on the flywheel 8. By setting the traditional integral gear ring to a split structure composed of the first half gear ring 1 and the second half gear ring 6, the installation paradigm of the gear ring is fundamentally changed. This eliminates the need for the gear ring to be integrally installed into the flywheel 8 using methods such as interference fit, thereby avoiding the cumbersome process of disassembling the engine and flywheel 8 during replacement. The design of the connecting part and fasteners enables reliable connection and convenient separation of the first half gear ring 1 and the second half gear ring 6.

[0011] Meanwhile, the connection positioning structure and the assembly positioning structure ensure the geometric accuracy of the split gear ring after splicing and the accuracy of its installation position on the flywheel 8, laying a structural foundation for fast and accurate disassembly and assembly operations on site, and significantly reducing the complexity, time and dependence on hoisting equipment in maintenance work.

[0012] The fastener includes a connecting bolt 2, which passes through a connecting hole 12, and connecting nuts 3 are installed at both ends of the connecting bolt 2. This design provides a standardized, highly reliable, and easy-to-apply connection method. The controllable torque and adjustable preload of the bolts and nuts ensure a tight fit between the mating surfaces of the first half-gear ring 1 and the second half-gear ring 6, forming a complete gear ring with sufficient rigidity to withstand the meshing impact during startup. Simultaneously, this structure facilitates operation with conventional wrenches, meeting the needs of rapid on-site repairs and reducing the barrier to entry and cost of using specialized tools.

[0013] At the position of the first half gear ring 1 corresponding to the connecting nut 3, two symmetrically distributed weight-reducing holes 14 are respectively opened. The weight-reducing holes 14 are arranged through the thickness direction of the first half gear ring 1. The size of the weight-reducing holes 14 is configured to allow a standard wrench tool to be inserted to operate the connecting nut 3. At the position of the connecting nut 3 on the second half gear ring 6, two symmetrically distributed weight-reducing holes 14 are respectively opened. The weight-reducing holes 14 are arranged through the thickness direction of the second half gear ring 6. The size of the weight-reducing holes 14 is configured to allow a standard wrench tool to be inserted to operate the connecting nut 3. After the connecting bolt 2 is inserted into the connecting hole 12, both ends of the connecting bolt 2 are inserted into the weight reduction holes 14 located in the first half gear ring 1 and the second half gear ring 6, respectively, and the connecting nut 3 is set in the weight reduction hole 14. This design allows standard wrenches to pass through the weight-reducing hole 14 and operate directly on the connecting nut 3 located therein, eliminating the need for additional complex space design or disassembly of other components for operating the nut. This makes the tightening and loosening process of the connecting bolt 2 extremely direct and fast, substantially promoting the achievement of the goal of rapid assembly and disassembly.

[0014] Furthermore, the position and size of the weight reduction hole 14 are set to correspond to the connecting nut 3. Considering that the connecting positioning structure and fasteners set at the connection part of the first half gear ring 1 and the second half gear ring 6 have a certain weight, by removing some material from the corresponding part of the gear ring body, the local weight reduction of this part of the gear ring is achieved. This makes the weight added by the connecting positioning structure and fasteners match the weight reduced by the weight reduction hole 14, thus balancing the overall weight distribution of the gear ring. This is beneficial to reducing the rotational inertia of the entire gear ring and flywheel 8, and can more effectively improve the engine start-up response.

[0015] A pad 4 is provided between the connecting nut 3 and the inner contour of the weight reduction hole 14. The side of the pad 4 near the weight reduction hole 14 is set with an arc-shaped structure to match the inner contour of the weight reduction hole 14. The pad 4 increases the contact area between the connecting nut 3 and the bodies of the first half gear ring 1 and the second half gear ring 6, allowing the locking force to be transmitted more evenly to the gear ring body, effectively dispersing local stress and preventing the gear ring material from being crushed due to point contact or line contact. The arc-shaped fitting design of the pad 4 ensures its stability within the weight reduction hole 14 and prevents it from deflecting. The above structures together enhance the anti-loosening performance of the fastening assembly under continuous engine vibration conditions, improve connection reliability, and protect the gear ring body from damage by the connecting nut 3.

[0016] The connection positioning structure includes a connection positioning pin 5 disposed on the connection part of the first half gear ring 1 and a connection positioning pin hole 13 disposed on the connection part of the second half gear ring 6 that cooperates with the connection positioning pin 5. Alternatively, it may include a connecting positioning pin hole 13 disposed on the connecting part of the first half gear ring 1 and a connecting positioning pin 5 disposed on the connecting part of the second half gear ring 6 that cooperates with the connecting positioning pin hole 13. Alternatively, it may include a connecting positioning pin hole 13 disposed on the connecting part of the first half gear ring 1 and the connecting part of the second half gear ring 6, and a connecting positioning pin 5 that cooperates with the connecting positioning pin hole 13, wherein the two ends of the connecting positioning pin 5 are respectively disposed in the connecting positioning pin hole 13 on the connecting part of the first half gear ring 1 and the connecting part of the second half gear ring 6. This design provides a flexible and precise docking guidance mechanism, enabling the first half gear ring 1 and the second half gear ring 6 to be precisely positioned in the docking plane before the fasteners are tightened. This prevents the two half gear rings from misaligning in the circumferential and radial directions, thereby ensuring normal and smooth meshing with the starter gear and avoiding abnormal wear or noise caused by improper splicing.

[0017] The connecting positioning pin 5 and the connecting positioning pin hole 13 adopt a transition fit. The transition fit eliminates the obvious gap between the connecting locating pin 5 and the connecting locating pin hole 13, ensuring positioning accuracy and overall rigidity after the first half gear ring 1 and the second half gear ring 6 are spliced ​​together. It also avoids the difficulties of forced insertion or disassembly caused by interference fit. This allows the connecting locating pin 5 to be smoothly guided into alignment and to make close contact with the hole wall after final tightening, jointly resisting shear force, while also facilitating separation operations during maintenance.

[0018] The assembly positioning structure includes: symmetrically arranged assembly positioning grooves 11 at the connection between the first half gear ring 1 and the second half gear ring 6; the assembly positioning grooves 11 of the first half gear ring 1 and the second half gear ring 6 are joined together to form an assembly positioning pin 10 hole; the assembly positioning pin 10 hole is adapted to the assembly positioning pin 10. By disassembling a complete locating pin hole onto the first half-gear ring 1 and the second half-gear ring 6, a single half-gear ring can achieve self-positioning through initial engagement with the locating pin 10 mounted on the flywheel 8. This simplifies the alignment process during installation. The operator only needs to align the mounting locating slots 11 of the first half-gear ring 1 and the second half-gear ring 6 with the mounting locating pin 10 of the flywheel 8. There is no need to precisely align a complete, easily obscured, and difficult-to-align hole axially while the flywheel is suspended. This significantly reduces the assembly difficulty in confined spaces and improves installation speed and the success rate on the first attempt.

[0019] The first half gear ring 1 and the second half gear ring 6 are provided with several lifting holes 9. The lifting hole 9 provides a clear stress point for the wire rope, hook, or special lifting tool, allowing the heavier first half-gear ring 1 and second half-gear ring 6 to be stably and balancedly lifted to the installation position or removed from the flywheel 8. This avoids slippage, bumping, or damage to the tooth profile that may be caused by directly binding the gear ring body, improving the controllability and safety of the heavy component handling process, and is an important auxiliary guarantee for the smooth implementation of the rapid on-site assembly and disassembly method.

[0020] The first half-gear ring 1 and the second half-gear ring 6 are detachably connected to the flywheel 8 by multiple mounting bolts 7. The evenly distributed mounting bolts 7 ensure a tight fit between the entire gear ring end face and the flywheel 8 end face, ensuring reliable torque transmission. They also allow for independent inspection and tightening of individual mounting bolts 7, facilitating long-term maintenance.

[0021] In a second aspect of the invention, a method for disassembling and assembling a split gear ring for a gas engine is provided, including an installation process and a disassembly process. The installation process includes: cleaning the end face of the flywheel 8 and the inner hole mating surfaces of the first half gear ring 1 and the second half gear ring 6 to be installed; aligning the first half gear ring 1 with the assembly positioning pin 10 on the flywheel 8 through the assembly positioning structure; and using the installation bolts 7 to pre-position and pre-tighten the first half gear ring 1 and the flywheel 8. Insert the connecting bolt 2 into the connecting through hole of the first half gear ring 1, and install the pad 4 and connecting nut 3 in the weight reduction hole 14 of the first half gear ring 1. Hoist the second half gear ring 6 to the assembly position and align it with the connecting part of the already positioned first half gear ring 1. Connect the second half gear ring 6 to the assembly positioning pin 10 on the flywheel 8 through the assembly positioning structure. Let the other end of the connecting bolt 2 pass through the connecting through hole of the second half gear ring 6. Connect the positioning pin 5 and the positioning pin hole 13. Install the pad 4 and connecting nut 3 in the weight reduction hole 14 of the second half gear ring 6. Use the mounting bolt 7 to pre-position and pre-tighten the second half gear ring 6 and the flywheel 8. Tighten all mounting bolts 7 connecting the first half gear ring 1 and the second half gear ring 6 to the flywheel 8 in the set sequence to the specified torque to complete the installation; The disassembly process includes: loosening all the mounting bolts 7 connecting the first half gear ring 1 and the second half gear ring 6 to the flywheel 8 in a set sequence with a set torque; removing the mounting bolts 7 on the first half gear ring 1; loosening and removing the pad 4 and connecting nut 3 installed in the weight reduction hole 14 of the first half gear ring 1; removing the first half gear ring 1 along the axial direction of the connecting bolt 2; then loosening and removing the pad 4, connecting nut 3, and connecting bolt 2 installed in the weight reduction hole 14 of the second half gear ring 6; removing the mounting bolts 7 on the second half gear ring 6; and finally removing the second half gear ring 6.

[0022] The split-type gear ring not only has structural advantages but also a highly efficient assembly and disassembly process. The entire process is based on a split design and positioning structure, avoiding the complex operations of hoisting the engine and disassembling the flywheel in traditional technologies. The steps of cleaning, initial positioning and pre-tightening, alignment and splicing, and final tightening are interconnected, ensuring assembly quality, significantly reducing labor intensity, shortening equipment downtime, and reducing reliance on large lifting equipment and corresponding safety risks. It truly achieves the core objective of quickly replacing the gear ring on-site using conventional tools, effectively reducing overall maintenance costs.

[0023] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A split-type gear ring for a gas engine, characterized in that, It includes a first half-gear ring and a second half-gear ring. The first half-gear ring and the second half-gear ring have the same structure and are both divided along the tooth root, and are spliced ​​together to form a complete annular gear ring. A connecting part is provided at the joint of the first half-gear ring and the second half-gear ring. The connecting part is provided with a connecting hole. A fastener is provided in the connecting hole. The fastener is inserted through the connecting hole to detachably connect the first half-gear ring and the second half-gear ring into one piece. The connection part of the first half gear ring and the second half gear ring is provided with a connection positioning structure and an assembly positioning structure. The connection positioning structure is used to ensure the full circle accuracy after the first half gear ring and the second half gear ring are spliced. An assembly positioning pin is provided on the flywheel. The assembly positioning structure is adapted to the assembly positioning pin to realize the radial and circumferential positioning of the first half gear ring and the second half gear ring on the flywheel.

2. The split-type gear ring for a gas engine as described in claim 1, characterized in that, The fastener includes a connecting bolt, which passes through the connecting hole, and connecting nuts are installed at both ends of the connecting bolt.

3. A split-type gear ring for a gas engine as described in claim 2, characterized in that, At the position of the first half gear ring corresponding to the connecting nut, two symmetrically distributed weight-reducing holes are respectively opened. The weight-reducing holes are arranged through the thickness direction of the first half gear ring. The size of the weight-reducing holes is configured to allow a standard wrench tool to be inserted to operate the connecting nut. At the position of the second half gear ring corresponding to the connecting nut, two symmetrically distributed weight-reducing holes are respectively opened. The weight-reducing holes are arranged through the thickness direction of the second half gear ring. The size of the weight-reducing holes is configured to allow a standard wrench tool to be inserted to operate the connecting nut. After the connecting bolt passes through the connecting hole, both ends of the connecting bolt pass through the weight reduction holes located in the first half gear ring and the second half gear ring, respectively, and the connecting nut is set in the weight reduction hole.

4. A split-type gear ring for a gas engine as described in claim 3, characterized in that, A pad is provided between the connecting nut and the inner contour of the weight reduction hole. The side of the pad near the weight reduction hole is set with an arc-shaped structure to match the inner contour of the weight reduction hole.

5. A split-type gear ring for a gas engine as described in claim 1, characterized in that, The connection positioning structure includes a connection positioning pin disposed on the first half gear ring connection part and a connection positioning pin hole disposed on the second half gear ring connection part that cooperates with the connection positioning pin. Alternatively, it may include a connecting positioning pin hole provided on the first half gear ring connecting part and a connecting positioning pin provided on the second half gear ring connecting part that mates with the connecting positioning pin hole. Alternatively, it may include connecting positioning pin holes disposed on the first half gear ring connecting part and the second half gear ring connecting part, and connecting positioning pins that cooperate with the connecting positioning pin holes, wherein the two ends of the connecting positioning pins are respectively disposed in the connecting positioning pin holes of the first half gear ring connecting part and the second half gear ring connecting part.

6. A split-type gear ring for a gas engine as described in claim 5, characterized in that, The connecting positioning pin and the connecting positioning pin hole adopt a transition fit.

7. A split-type gear ring for a gas engine as described in claim 1, characterized in that, The assembly positioning structure includes: symmetrically arranged assembly positioning grooves at the connection between the first half gear ring and the second half gear ring, the assembly positioning grooves of the first half gear ring and the second half gear ring being spliced ​​together to form an assembly positioning pin hole, and the assembly positioning pin hole being adapted to the assembly positioning pin.

8. A split-type gear ring for a gas engine as described in claim 1, characterized in that, The first and second half gear rings are provided with several lifting holes.

9. A split-type gear ring for a gas engine as described in claim 1, characterized in that, The first and second half gear rings are detachably connected to the flywheel via multiple mounting bolts.

10. A method for disassembling and assembling a split-type gear ring for a gas engine as described in any one of claims 1-9, characterized in that, This includes the installation and disassembly processes; The installation process includes: cleaning the flywheel end face and the inner hole mating surfaces of the first half gear ring and the second half gear ring to be installed; aligning the first half gear ring with the assembly positioning pin on the flywheel through the assembly positioning structure; and using mounting bolts to pre-position and pre-tighten the first half gear ring and the flywheel. Insert the connecting bolt into the connecting through hole of the first half gear ring, and install the pad and connecting nut in the weight reduction hole of the first half gear ring. Hoist the second half gear ring to the assembly position and align it with the connecting part of the already positioned first half gear ring. Connect the second half gear ring to the assembly positioning pin on the flywheel through the assembly positioning structure. Let the other end of the connecting bolt pass through the connecting through hole of the second half gear ring. The connecting positioning pin engages with the connecting positioning pin hole. Install the pad and connecting nut in the weight reduction hole of the second half gear ring. Use the mounting bolt to pre-position and pre-tighten the second half gear ring and the flywheel. Tighten all mounting bolts connecting the first and second half gear rings to the flywheel to the specified torque in the set sequence to complete the installation; The disassembly process includes: loosening all mounting bolts connecting the first half-gear ring and the second half-gear ring to the flywheel in a set sequence with a set torque; removing the mounting bolts on the first half-gear ring; loosening and removing the pad and connecting nut installed in the weight reduction hole of the first half-gear ring; removing the first half-gear ring along the axial direction of the connecting bolts; then loosening and removing the pad, connecting nut, and connecting bolt installed in the weight reduction hole of the second half-gear ring; removing the mounting bolts on the second half-gear ring; and finally removing the second half-gear ring to complete the disassembly.

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