A special tool for dismounting cylinder liner of V-type diesel engine
By using a micro-motor driven bevel gear transmission system and a limiting groove design, the problems of uneven force and limited space that exist in existing V-type diesel engine cylinder liner pullers under manual operation are solved, achieving efficient, non-destructive, and stable disassembly of cylinder liners.
Patent Information
- Application Number
- CN202522015431.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-19
AI Technical Summary
Existing V-type diesel engine cylinder liner pullers rely on manual rotation of the screw, which can cause torque fluctuations, resulting in uneven stress on the cylinder liner and potentially leading to deformation or cylinder bore scratches. Furthermore, they are difficult to use effectively in space-constrained situations.
The puller, driven by a micro motor, rotates the screw through a bevel gear transmission system. The design of the limiting groove and limiting block ensures uniform rotation of the screw and stable disassembly. The protective cover protects the bevel gear and motor from contamination and enhances connection stability.
It enables efficient and non-destructive disassembly of V-type diesel engine cylinder liners, avoiding cylinder liner deformation and cylinder bore scratches. At the same time, it overcomes the operational difficulties caused by space constraints, improving disassembly efficiency and reliability.
Smart Images
Figure CN224674796U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive repair equipment technology, specifically relating to a special disassembly tool for V-type diesel engine cylinder liners. Background Technology
[0002] The cylinder liner of a V-type diesel engine is a cylindrical part embedded in the cylinder bore of the cylinder block. It is a core component of the "working chamber" where the piston reciprocates. It comes into direct contact with the high-temperature, high-pressure combustion gases and bears the reciprocating friction and lateral thrust of the piston. Therefore, it is usually made of wear-resistant and heat-resistant alloy cast iron, and some are further enhanced with processes such as chrome plating and phosphating on the inner surface to improve wear resistance and corrosion resistance. Its main function is to guide the piston, prevent combustion gas leakage and coolant seepage into the combustion chamber, and dissipate heat through contact with the coolant on its outer surface, protecting the cylinder block from direct wear and high-temperature corrosion. After long-term operation, V-type diesel engine cylinder liners require regular maintenance or replacement. A specialized puller is the core tool for removing V-type diesel engine cylinder liners. Designed for the V-shaped angle, it has adjustable claws or support arms to avoid adjacent cylinders and other components. Its structure provides stable axial pulling force. Through the cooperation of the claws, center screw, and support seat, it achieves safe and non-destructive disassembly of the cylinder liner, ensuring the efficiency and reliability of the disassembly process. Most existing V-type diesel engine cylinder liner pullers rely on manual rotation of the screw. However, when operating manually, the torque applied by the operator is prone to fluctuations (especially when the cylinder liner is tightly adhered to the cylinder block). This can cause fluctuations in the axial tension of the screw, resulting in excessive local stress on the cylinder liner, leading to deformation or cylinder bore scratches. Furthermore, the angle between the two cylinder banks of a V-type diesel engine is relatively small, and there may be components such as oil pipes, water pipes, and sensors around the cylinder block. The manual handle is easily restricted by space, making it difficult to apply force. Utility Model Content
[0003] The purpose of this utility model is to provide a special disassembly tool for V-type diesel engine cylinder liners. It aims to solve the problem that most existing V-type diesel engine cylinder liner pullers rely on manual rotation of the screw. However, during manual operation, the torque applied by the operator is prone to fluctuation (especially when the cylinder liner is tightly adhered to the cylinder block), which may cause fluctuations in the axial tension of the screw. This can lead to excessive local stress on the cylinder liner, resulting in deformation or scratches on the cylinder bore. Furthermore, the V-type diesel engine has a small angle between the two rows of cylinders, and there may be components such as oil pipes, water pipes, and sensors around the cylinder block. The manual handle is easily restricted by space, making it difficult to apply force.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a special disassembly tool for V-type diesel engine cylinder liners, comprising a puller body, a screw threadedly connected to the surface of the puller body, a connector head connected to the top surface of the screw, a first limiting groove formed on the surface of the connector head, a first limiting block inserted into the surface of the first limiting groove, the surface of the first limiting block connected to the inner wall of a first bevel gear, the surface of the first bevel gear threadedly connected to the connector head by a first bolt, the surface of the first bevel gear meshing with a second bevel gear, a second limiting groove formed on the inner wall surface of the second bevel gear, a second limiting block inserted into the surface of the second limiting groove, the surface of the second limiting block connected to both sides of an output shaft, the surface of the output shaft threadedly connected to a second bevel gear by a second bolt, the bottom surface of the output shaft connected to the output end of a micro motor, the surface of the micro motor mounted on the surface of the top horizontal plate of the puller body, and dovetail grooves symmetrically formed on both sides of the top horizontal plate of the puller body.
[0005] As a preferred embodiment of the V-type diesel engine cylinder liner disassembly tool of this utility model, the first limiting groove is a "T"-shaped groove whose shape and size are adapted to the first limiting block, and the second limiting groove is a "T"-shaped groove whose shape and size are adapted to the second limiting block.
[0006] As a preferred embodiment of the V-type diesel engine cylinder liner disassembly tool of this utility model, the connector, the first bevel gear and the first bolt form a threaded connection structure, and the second bevel gear, the output shaft and the second bolt form a threaded connection structure.
[0007] As a preferred embodiment of the V-type diesel engine cylinder liner disassembly tool of this utility model, the dovetail groove surface engages with the insert block, the insert block surface engages with the connecting ear surfaces on both sides of the protective cover, and the protective cover surface abuts against the surface of the top horizontal plate of the puller body.
[0008] As a preferred embodiment of the V-type diesel engine cylinder liner disassembly tool of this utility model, a control panel is mounted on the surface of the top horizontal plate of the puller body, and a micro motor is electrically connected to the surface of the control panel.
[0009] As a preferred embodiment of the V-type diesel engine cylinder liner disassembly tool of this utility model, the inner wall of the protective cover is equipped with two bearings, and the connector and output shaft are respectively sleeved in the bearings on the inner wall of the protective cover.
[0010] Compared with the prior art, the beneficial effects of this utility model are: The micro motor installed on the puller body drives the second and second bevel gears to rotate, thereby driving the screw to rotate. This, in turn, adjusts the pull claw installed at the bottom of the puller body to drive the fixed V-type diesel engine cylinder liner to disengage from the disengaged cylinder, making it convenient, efficient and uniform to disassemble the sleeved V-type diesel engine cylinder liner using the adjusting screw. Meanwhile, the protective cover installed on the puller body shields and protects the first and second bevel gears and the micro motor, preventing external oil stains from contaminating their surfaces and thus affecting the connection stability of the first and second bevel gears. Attached Figure Description
[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the main cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of the protective cover and the first and second bevel gears of this utility model; Figure 4 This is a cross-sectional exploded view of the first and second bevel gears of this utility model.
[0012] In the diagram: 1. Puller body; 2. Screw; 3. Connector; 4. First limiting groove; 5. First limiting block; 6. First bevel gear; 7. First bolt; 8. Second bevel gear; 9. Second limiting groove; 10. Second limiting block; 11. Output shaft; 12. Second bolt; 13. Micro motor; 14. Dovetail groove; 15. Insert block; 16. Protective cover; 17. Control panel. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Please see Figures 1-4This utility model provides the following technical solution: A special disassembly tool for V-type diesel engine cylinder liners, including a puller body 1, a screw 2 threadedly connected to the surface of the puller body 1, a connector 3 connected to the top surface of the screw 2, a first limiting groove 4 formed on the surface of the connector 3, a first limiting block 5 inserted into the surface of the first limiting groove 4, the surface of the first limiting block 5 connected to the inner wall of a first bevel gear 6, the surface of the first bevel gear 6 threadedly connected to the connector 3 by a first bolt 7, a second bevel gear 8 meshing with the surface of the first bevel gear 6, a second limiting groove 9 formed on the inner wall surface of the second bevel gear 8, a second limiting block 10 inserted into the surface of the second limiting groove 9, and the surface of the second limiting block 10 connected to the inner wall of the first bevel gear 8. On both sides of the output shaft 11, the surface of the output shaft 11 is threadedly connected to the second bevel gear 8 using the second bolt 12. The bottom surface of the output shaft 11 is connected to the output end of the micro motor 13. The surface of the micro motor 13 is mounted on the surface of the top horizontal plate of the puller body 1. Dovetail grooves 14 are symmetrically opened on both sides of the top horizontal plate of the puller body 1. In this design scheme, the puller body 1, the screw 2 and the connector 3 constitute the main body of the V-type diesel engine cylinder liner puller. The V-type diesel engine cylinder liner puller body contains a large number of related components. Since these are existing technologies and the core content of this technical solution is irrelevant to them, they will not be described in detail in this technical solution. Preferably, the first limiting groove 4 is a "T"-shaped groove, the shape and size of which are adapted to the first limiting block 5, and the second limiting groove 9 is a "T"-shaped groove, the shape and size of which are adapted to the second limiting block 10.
[0015] In practical use, when the connector 3, the first bevel gear 6, the second bevel gear 8, and the output shaft 11 are plugged in and fixed, the connection between the two is guided and limited by the cooperation of the first limiting groove 4, the first limiting block 5, the second limiting groove 9, and the second limiting block 10, so as to facilitate quick positioning and fix the connector 3, the first bevel gear 6, the second bevel gear 8, and the output shaft 11.
[0016] Preferably, the connector 3, the first bevel gear 6 and the first bolt 7 form a threaded connection structure, and the second bevel gear 8, the output shaft 11 and the second bolt 12 form a threaded connection structure.
[0017] In practical use, the connector 3 and the first bevel gear 6 are connected by the first bolt 7, which facilitates their fixing and disassembly. Similarly, when the second bevel gear 8 needs to be replaced, it can be disassembled simply by loosening the second bolt 12 that is threaded between the second bevel gear 8 and the output shaft 11.
[0018] Preferably, the dovetail groove 14 engages with the plug 15, the plug 15 engages with the connecting ear surfaces on both sides of the protective cover 16, and the surface of the protective cover 16 abuts against the surface of the top horizontal plate of the puller body 1.
[0019] In practical use, the plug 15, which is inserted between the puller body 1 and the connecting ear of the protective cover 16, can be pulled out to disassemble the protective cover 16. In actual use, the plug 15 is made of high-strength engineering plastic. At the same time, the angle of the plug 15 and the dovetail groove 14 (usually designed to be 15°-30°) will cause the weight or slight vibration of the protective cover 16 to be converted into "positive pressure along the slope" after the plug 15 is inserted, forcing the plug 15 to fit tightly with the dovetail groove 14 to form a self-locking mechanism.
[0020] Preferably, a control panel 17 is mounted on the surface of the top horizontal plate of the puller body 1, and a micro motor 13 is electrically connected to the surface of the control panel 17.
[0021] In practical use, the operating parameters of the micro motor 13 can be set through the control panel 17 and the micro motor 13 connected to it via the controller, so as to meet the stable operation in different scenarios.
[0022] Preferably, two bearings are installed on the inner wall of the protective cover 16, and the connector 3 and the output shaft 11 are respectively sleeved in the bearings on the inner wall of the protective cover 16.
[0023] In actual use, the connector 3 and the output shaft 11 are fitted and limited by two bearings installed on the protective cover 16 to make their rotation more stable.
[0024] Working principle: When disassembling the cylinder liner of a V-type diesel engine using the puller body 1, a special puller claw assembly is connected to the "slider assembly" of the puller body 1 via a hinge or sliding guide rail. The slider assembly is sleeved on the outside of the central screw 2 and can slide along the axial direction of the screw 2. After fixing the puller claw assembly, the puller claw assembly at the bottom of the puller body 1 can be inserted into the cylinder liner. Then, the output shaft 11 connected to it is controlled by the control panel 17, which drives the second bevel gear 8 connected to its top thread to rotate, causing the first bevel gear 6 meshing with the surface of the second bevel gear 8 to rotate together. This adjusts the rotation of the screw 2, causing the slider assembly on it to move towards the support seat (closer to the top surface of the cylinder block). Through the linkage mechanism, the puller claw is driven to retract inward (at this time, the outer diameter of the puller claw is smaller than the inner diameter of the cylinder liner). The retracted puller claw assembly is inserted into the cylinder bore from the top of the cylinder liner, ensuring that the puller claw is fully inserted into the cylinder liner. At this point, the micro motor 13 stops running. Then, the operating parameters of the micro motor 13 are set again through the control panel 17, causing it to start rotating in the opposite direction. This drives the slider assembly on the surface of the puller body 1 away from the support seat (moving towards the inside of the cylinder liner). The claws open outward under the action of the connecting rod until the claw teeth tightly bite the inner wall of the cylinder liner (usually the biting depth is 2-3mm to avoid damaging the cylinder liner). At the same time, the micro motor 13 continues to run and rotate, driving the screw 2 to rotate together through the meshing first bevel gear 6 and second bevel gear 8. This causes the claws on the surface of the puller body 1 to generate sufficient friction with the inner wall of the cylinder liner. The screw 2 moves upward under the action of the nut on the support seat (the support seat is fixed to the top surface of the cylinder body). The axial force is transmitted to the claws through the slider assembly. The axial force overcomes the interference fit force between the cylinder liner and the cylinder body and the adhesive force of the sealant, allowing the cylinder liner to be smoothly dislodged along the cylinder bore axis. Throughout the process, the pull claw maintains a radial gripping force on the cylinder liner to prevent slippage or tilting, thereby allowing the sleeved cylinder liner to disengage from the sleeved cylinder and complete its rapid disassembly. When the micro motor 13 is running, the "torque limiter" installed in its circuit will automatically cut off the power supply to the micro motor 13 when the torque of the screw 2 exceeds the set value, preventing the first bevel gear 6 and the second bevel gear 8 from breaking and the screw 2 from stripping its threads. When disassembling the cylinder liner of the V-type diesel engine using the above operations, the protective cover 16, which is snapped and fixed to the surface of the top horizontal plate of the puller body 1, shields the first bevel gear 6, the second bevel gear 8, and the micro motor 13, preventing environmental oil from adhering to their surfaces and affecting their stable connection and service life. In actual use, the protective cover 16 can be made of fluoroplastic material, which can prevent oil from adhering while not affecting the heat dissipation generated by the micro motor 13 during operation. In addition, when it is necessary to remove the first bevel gear 6 and the second bevel gear 8 from the inside of the protective cover 16... When maintaining the wheel 8 and the micro motor 13, the plug 15, which is engaged between the puller body 1 and the connecting lug of the protective cover 16, can be pulled out to disassemble the protective cover 16. In actual use, the plug 15 is made of high-strength engineering plastic. At the same time, the angle of the inclined surface of the plug 15 and the dovetail groove 14 (usually designed to be 15°-30°) will cause the weight or slight vibration of the protective cover 16 to be converted into "positive pressure along the inclined surface" after the plug 15 is inserted, forcing the plug 15 to fit tightly with the dovetail groove 14 to form a self-locking mechanism, thus preventing the part of the plug 15 engaged from loosening due to the vibration generated when the micro motor 13 is running.
[0025] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A special tool for removing cylinder liners of V-type diesel engines, comprising a puller body (1), characterized in that: The puller body (1) is threadedly connected to a screw rod (2), and a connector (3) is connected to the top surface of the screw rod (2). A first limiting groove (4) is formed on the surface of the connector (3), and a first limiting block (5) is inserted into the surface of the first limiting groove (4). The surface of the first limiting block (5) is connected to the inner wall of the first bevel gear (6). The surface of the first bevel gear (6) is threadedly connected to the connector (3) by a first bolt (7). The surface of the first bevel gear (6) is meshed with a second bevel gear (8), and the inner wall of the second bevel gear (8) is connected to the first bevel gear (8). A second limiting groove (9) is opened on the surface, and a second limiting block (10) is inserted into the surface of the second limiting groove (9). The surface of the second limiting block (10) is connected to both sides of the output shaft (11). The surface of the output shaft (11) is threadedly connected to the second bevel gear (8) by the second bolt (12). The bottom surface of the output shaft (11) is connected to the output end of the micro motor (13). The surface of the micro motor (13) is mounted on the surface of the top horizontal plate of the puller body (1). Dovetail grooves (14) are symmetrically opened on both sides of the top horizontal plate of the puller body (1).
2. The special disassembly tool for V-type diesel engine cylinder liners according to claim 1, characterized in that: The first limiting groove (4) is a "T" shaped groove, and its shape and size are adapted to the first limiting block (5). The second limiting groove (9) is a "T" shaped groove, and its shape and size are adapted to the second limiting block (10).
3. The special disassembly tool for V-type diesel engine cylinder liners according to claim 1, characterized in that: The connector (3), the first bevel gear (6) and the first bolt (7) form a threaded connection structure, and the second bevel gear (8), the output shaft (11) and the second bolt (12) form a threaded connection structure.
4. The special disassembly tool for V-type diesel engine cylinder liners according to claim 1, characterized in that: The dovetail groove (14) is engaged with the plug (15), the plug (15) is engaged with the connecting ear surfaces on both sides of the protective cover (16), and the surface of the protective cover (16) abuts against the top horizontal plate surface of the puller body (1).
5. A special disassembly tool for V-type diesel engine cylinder liners according to claim 1, characterized in that: A control panel (17) is mounted on the surface of the top horizontal plate of the puller body (1), and a micro motor (13) is electrically connected to the surface of the control panel (17).
6. A special tool for disassembling V-type diesel engine cylinder liners according to claim 4, characterized in that: Two bearings are installed on the inner wall of the protective cover (16), and the connector (3) and the output shaft (11) are respectively sleeved in the bearings on the inner wall of the protective cover (16).