Special tool for hoisting bearing bush at large end of connecting rod

Abstract

The invention relates to the technical field of low-speed diesel engine manufacturing, and discloses a special tool for lifting a connecting rod large-end bearing bush, which comprises a cross rod, a wing-shaped clamping screw, a bearing bush fixing plate, a vertical rod and a large-end bearing guide plate. A wing-shaped clamping screw is arranged on the front face of a transverse rod, bearing bush fixing plates are symmetrically installed on the two sides of the upper surface of the transverse rod, a vertical rod is vertically arranged at the center position of the transverse rod, and a large-end bearing guide plate with a rolling contact face is arranged on the front face and the back face of the top end of the vertical rod. The design of the matched threaded holes facilitates storage and taking of the screws; an integrated structure of the bearing bush fixing plate and the transverse rod is matched with a transverse limiting function, so that the bearing bush is accurately aligned with a bearing seat during hoisting, and suspension deviation is prevented; and the rolling guide device at the top end of the vertical rod converts sliding friction into rolling friction, so that the dismounting resistance is obviously reduced and the fretting wear of the bearing bush is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-speed diesel engine manufacturing, and specifically to a special lifting tool for the big-end bearing shell of a connecting rod. Background Art

[0002] A low-speed diesel engine, also known as a two-stroke diesel engine, is an important branch in the field of internal combustion engines and is widely used in fields such as ship propulsion, large power stations, and industrial drives. Its core feature is a low rated speed, directly driving a propeller or a generator, with characteristics of high efficiency, reliability, and durability. During the manufacturing process of a low-speed diesel engine, a special lifting tool is required for the big-end bearing shell of the connecting rod. Since the diameter of the big-end bearing shell of the connecting rod of a low-speed diesel engine can reach more than 900 millimeters and the single-piece weight may exceed 50 kilograms, manual handling is likely to cause injury to personnel or dropping of components. At the same time, the lifting tool uses a guide pin or a positioning boss to ensure precise alignment of the bearing shell with the connecting rod hole and the crankshaft journal, avoiding wear or oil leakage caused by misalignment.

[0003] Traditional lifting tools for the big-end bearing shell of a connecting rod use clamping jaws to fix the bearing shell. The installation and use process is complex, time-consuming and laborious, and the assembly efficiency is low. They cannot provide sufficient force and stability for lifting, and are prone to damaging the big-end bearing shell. Also, due to limited space for some repairs or assemblies, the lifting tool must have a compact design. The big-end bearing shell needs to be accurately positioned during lifting to ensure the correct fit between the lifting tool and the bearing shell. The lifting tool needs to be able to precisely control the position of the bearing shell to avoid deviation during the hoisting process. For this reason, a special lifting tool for the big-end bearing shell of a connecting rod is proposed. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a special lifting tool for the big-end bearing shell of a connecting rod to solve the technical problems of difficult installation and disassembly, time-consuming and laborious, and inability to protect the bearing of the big-end bearing shell of the above-mentioned low-speed diesel engine.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions: A special lifting tool for the big-end bearing shell of a connecting rod, comprising:

[0008] A cross bar, and wing-type clamping screws arranged on the front surface of the cross bar, and bearing shell fixing plates are installed on both sides of the upper surface of the cross bar;

[0009] The vertical rod is arranged at the center position of the upper surface of the cross rod, and large-end bearing guide plates are installed on the front and back of the top end of the vertical rod. Hang the special tool for lifting the connecting rod big-end bearing bush under the bush to be disassembled, adjust the position of the vertical rod, so that the large-end bearing guide plates at the top end of the vertical rod are embedded into the preset slots at the bottom of the bush, and form a preliminary sliding fit with the bush through the rolling contact surface. Rotate the wing-shaped clamping screw on the front of the cross rod, and manually apply axial pressure by using its wing-shaped structure, so that the end of the screw gradually fits with the surface of the bush end cover. Compress the bush end cover inward by continuously tightening until the mating surface between the bush and the bearing housing is completely loosened. After the bush is loosened, the bush fixing plate automatically snaps into the two side edges of the bush and forms a lateral limiting structure with the cross rod. Synchronously confirm that the vertical rod maintains rolling contact with the bottom slot of the bush through the large-end bearing guide plate. At this time, the bush and the tool form a rigid connection body, and the tool is vertically lifted by an external hoisting device to complete the disassembly of the bush.

[0010] Preferably, the cross rod includes a fixed rod, and side connecting rods are connected to both sides of the fixed rod, and gears are rotatably connected to both sides of the upper surface of the fixed rod. The gears rotate on the fixed rod, and one set of gears can drive another set of gears to rotate in the same direction and at the same speed on the fixed rod.

[0011] Preferably, threaded lead screws are additionally provided on the upper parts of both sides of the fixed rod, and limiting plates are installed on the lower parts of both sides of the fixed rod, and the overall shape of the limiting plates is "I"-shaped. The fixed rod can be connected to the corresponding structure through the threaded lead screws and the limiting plates.

[0012] Preferably, the side connecting rods are sleeved on the surfaces of the threaded lead screws, and the side connecting rods are slidably connected to the limiting plates. Spiral transmission pairs are formed between the two sides of the fixed rod and the side connecting rods through the threaded lead screws. The gears are meshed with the ends of the threaded lead screws. When the operator rotates the gears, the threaded lead screws rotate synchronously, driving the side connecting rods to slide horizontally along the surfaces of the limiting plates to adjust the distance between the two sets of side connecting rods.

[0013] Preferably, the vertical rod includes an upper connecting rod and a lower connecting rod, and the upper connecting rod is arranged at the top end of the lower connecting rod, and positioning holes are opened in the upper parts of both sides of the lower connecting rod. The lower connecting rod can be connected to the corresponding structure through the positioning holes.

[0014] Preferably, an extension rod is slidably connected to the inner cavity of the lower connecting rod, and the extension rod is connected to the upper connecting rod. Positioning insertion rods are evenly opened on both sides of the extension rod, and compression springs are evenly additionally provided in the inner cavity of the extension rod. Both ends of the compression spring are respectively connected to the surfaces of the corresponding positioning insertion rods, and the shapes and positions of the positioning insertion rods correspond to those of the positioning holes. The extension rod in the inner cavity of the lower connecting rod forms an elastic clamping assembly with the positioning insertion rods and the compression springs. When pressing the positioning insertion rods, the compression springs are compressed and contracted, and the ends of the positioning insertion rods are disengaged from the positioning holes. At this time, the extension rod can be pushed and pulled to adjust the effective length of the vertical rod. After releasing the positioning insertion rods, the compression springs reset and push the positioning insertion rods to snap into the corresponding positioning holes to achieve length locking.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a special tool for lifting the big-end bearing shell of a connecting rod, which has the following beneficial effects:

[0017] 1. For this special tool for lifting the big-end bearing shell of a connecting rod, the combined design of the cross bar and the wing-type clamping screw enables the fixing operation of the bearing shell to be completed by manually rotating the screw. The wing-type structure conforms to the ergonomic characteristics, and the progressive pressing of the bearing shell end cover can be realized without additional tools, avoiding the risk of damage to the mating surface of the bearing shell caused by the traditional knocking and disassembling method. The matching setting of the threaded hole and the clamping screw realizes the convenient storage and quick access of the screw, avoiding the risk of loss of scattered parts, improving the on-site operation efficiency, and being able to accurately control the position of the bearing shell to avoid deviation during the lifting process;

[0018] 2. The integrated structure of the bearing shell fixing plate and the cross bar ensures that the bearing shell always maintains the correct alignment with the bearing seat during the lifting process. Its lateral limiting function effectively prevents the position deviation of the bearing shell caused by suspension shaking, maintaining the assembly accuracy of the connecting rod assembly. The large-end bearing guide plate at the top of the vertical rod converts the sliding friction during the lifting of the bearing shell into rolling friction through the rolling contact surface design, significantly reducing the disassembly resistance, and at the same time reducing the fretting wear of the bearing shell surface caused by friction, prolonging the service life of key components, simplifying the bearing shell disassembly process while protecting the bearing structure. The overall structure of the tool, through the coordinated action of the horizontal and vertical double limiting systems, transforms the bearing shell disassembly process into a modular operation process. The operator only needs to complete two steps of screwing the screw and lifting the tool to achieve the rigid connection between the bearing shell and the tool, greatly simplifying the complexity of the traditional disassembly process and effectively shortening the equipment maintenance downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the composition structure of the cross bar of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the cross bar in cross-section of the present invention;

[0022] Figure 4 It is a schematic diagram of the composition structure of the vertical rod of the present invention;

[0023] Figure 5 It is a schematic diagram of the internal structure of the lower connecting rod in cross-section of the present invention;

[0024] Figure 6 It is a schematic diagram of the enlarged structure of the partial cross-section of the extension rod of the present invention.

[0025] In the figure: 1. Wing-shaped clamping screw; 2. Cross bar; 3. Bearing fixing plate; 4. Vertical bar; 5. Big end bearing guide plate; 6. Fixing rod; 7. Side connecting rod; 8. Gear; 9. Threaded screw; 10. Limiting plate; 11. Upper connecting rod; 12. Lower connecting rod; 13. Positioning hole; 14. Extension rod; 15. Positioning plug rod; 16. Extrusion spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides a technical solution, a special tool for lifting the connecting rod big end bearing, comprising: Figure 1 , a cross bar 2, and a wing-shaped clamping screw 1 arranged on the front of the cross bar 2, and bearing bush fixing plates 3 are installed on both sides of the upper surface of the cross bar 2;

[0028] The vertical rod 4 is arranged at the center of the upper surface of the cross bar 2, and the big end bearing guide plate 5 is installed on the front and back of the top of the vertical rod 4. The special tool for lifting the big end bearing of the connecting rod is hung below the bearing to be removed, and the position of the vertical rod 4 is adjusted so that the big end bearing guide plate 5 at the top of the vertical rod 4 is embedded in the preset notch at the bottom of the bearing, and forms a preliminary sliding fit with the bearing through the rolling contact surface. The wing-shaped clamping screw 1 on the front of the cross bar 2 is rotated, and the axial pressure is manually applied using its wing-shaped structure, so that the end of the screw is progressively fitted with the surface of the bearing end cover, and the bearing end cover is compressed inward by continuous tightening until the matching surface of the bearing and the bearing seat is completely loosened. After the bearing is loosened, the bearing fixing plate 3 is automatically stuck in the edges of both sides of the bearing, forming a lateral limit structure with the cross bar 2, and simultaneously confirming that the vertical rod 4 maintains rolling contact with the notch at the bottom of the bearing through the big end bearing guide plate 5. At this time, the bearing and the tool form a rigid connection. The tool is lifted vertically through external lifting equipment to complete the disassembly of the bearing. The manual tightening design of the wing-shaped clamping screw 1 replaces the traditional hammer disassembly method to avoid plastic deformation or surface scratches on the bearing mating surface due to impact load. The matching threaded holes realize the integrated storage of the screws and the cross bar 2 to prevent the risk of loss of scattered parts and improve the standardization of on-site operations. The integrated structure of the bearing fixing plate 3 and the cross bar 2 provides a lateral limit function, which automatically corrects the bearing posture during lifting to prevent the bearing-bearing seat hole alignment deviation caused by suspension shaking.

[0029] See also Figure 2 and Figure 3, the cross bar 2 includes a fixed rod 6, and both sides of the fixed rod 6 are connected with side connecting rods 7, and gears 8 are rotatably connected to both sides of the upper surface of the fixed rod 6. The gears 8 rotate on the fixed rod 6, and one set of gears 8 can drive another set of gears 8 to rotate in the same direction and at the same speed on the fixed rod 6. Threaded lead screws 9 are additionally provided on the upper parts of both sides of the fixed rod 6, and limit plates 10 are installed on the lower parts of both sides of the fixed rod 6, and the limit plates 10 are designed in an overall "I" shape. The fixed rod 6 can be connected to the corresponding structure through the threaded lead screws 9 and the limit plates 10. The side connecting rods 7 are sleeved on the surfaces of the threaded lead screws 9, and the side connecting rods 7 are slidably connected to the limit plates 10. A screw pair is formed between both sides of the fixed rod 6 and the side connecting rods 7 through the threaded lead screws 9, and the gears 8 are meshed with the ends of the threaded lead screws 9. When an operator rotates the gears 8, the threaded lead screws 9 rotate synchronously, driving the side connecting rods 7 to slide horizontally along the surfaces of the limit plates 10, realizing the distance between the two sets of side connecting rods 7. Through the coordinated action of the gears 8 and the threaded lead screws 9, the displacement accuracy of the side connecting rods 7 is improved to meet the lateral clamping requirements of different specifications of bearing shells. The "I"-shaped guide rail design of the limit plates 10 ensures that the side connecting rods 7 maintain a vertical posture during the adjustment process, avoiding the structural deformation of the cross bar 2 caused by eccentric loading and improving the clamping stability of the tool for the bearing shell.

[0030] Please refer to Figure 4 , Figure 5 and Figure 6 , the vertical rod 4 includes an upper connecting rod 11 and a lower connecting rod 12, and the upper connecting rod 11 is arranged at the top of the lower connecting rod 12, and positioning holes 13 are opened in the upper parts of both sides of the lower connecting rod 12. The lower connecting rod 12 can be connected to the corresponding structure through the positioning holes 13. An extension rod 14 is slidably connected to the inner cavity of the lower connecting rod 12, and the extension rod 14 is connected to the upper connecting rod 11, and positioning insertion rods 15 are evenly opened on both sides of the extension rod 14, and compression springs 16 are evenly additionally provided in the inner cavity of the extension rod 14. Both ends of the compression springs 16 are respectively connected to the surfaces of the corresponding positioning insertion rods 15, and the shapes and positions of the positioning insertion rods 15 correspond to those of the positioning holes 13. The extension rod 14 in the inner cavity of the lower connecting rod 12 and the positioning insertion rods 15 and the compression springs 16 form an elastic clamping assembly. When pressing the positioning insertion rods 15, the compression springs 16 are compressed and contracted, and the ends of the positioning insertion rods 15 are disengaged from the positioning holes 13. At this time, the extension rod 14 can be pushed and pulled to adjust the effective length of the vertical rod 4. After releasing the positioning insertion rods 15, the compression springs 16 reset and push the positioning insertion rods 15 to be inserted into the corresponding positioning holes 13 to realize length locking. The hierarchical telescopic design of the vertical rod 4 enables it to match different bearing shell radii. The array layout of the positioning insertion rods 15 and the positioning holes 13 provides different length adjustment gears, covering the mainstream bearing shell specifications. The elastic clamping mechanism simplifies the adjustment process, and the operator can complete the quick adjustment without additional tools, significantly improving the compatibility of the tool for bearing shells of multiple models.

[0031] This solution: On the upper surface of the fixed rod 6 of the rotating cross bar 2, there are gears 8 on both sides. Through the meshing drive of the gears 8 and the threaded lead screw 9, the side connecting rods 7 are driven to slide horizontally along the "I"-shaped guide rail of the limit plate 10, adjusting the distance between the two connecting rods 7 to match the transverse dimension of the bearing bush to be disassembled. Press the positioning insertion rods 15 on both sides of the extension rod 14 in the inner cavity of the lower connecting rod 12 of the vertical rod 4, so that the compression spring 16 is compressed to drive the positioning insertion rods 15 to disengage from the positioning holes 13. Push and pull the extension rod 14 until the total length of the vertical rod 4 is adapted to the radius of the bearing bush, and then release the positioning insertion rods 15. The length is locked by the reset of the compression spring 16;

[0032] Suspend the special tool for lifting the large end of the connecting rod after adjustment below the bearing bush. Adjust the position of the vertical rod 4 so that the large end bearing guide plate 5 at the top of the upper connecting rod 11 is inserted into the preset notch at the bottom of the bearing bush, forming a preliminary sliding fit through the rolling contact surface;

[0033] Rotate the wing-shaped clamping screw 1 on the front of the cross bar 2, and manually apply axial pressure using the wing-shaped structure, so that the end of the screw gradually fits with the surface of the bearing bush end cover. By continuously tightening, the bearing bush end cover is compressed inward until the mating surface between the bearing bush and the bearing housing is completely loosened;

[0034] After the bearing bush is loosened, the bearing bush fixing plate 3 on the upper surface of the cross bar 2 automatically snaps into the two sides of the bearing bush, forming a lateral limit structure with the cross bar 2; Synchronously confirm that the vertical rod 4 maintains rolling contact with the bottom notch of the bearing bush through the large end bearing guide plate 5. At this time, the bearing bush and the tool form a rigid connection body;

[0035] Lift the tool vertically through an external hoisting device. Utilize the lateral limit function of the bearing bush fixing plate 3 and the rolling guiding effect of the vertical rod 4 to keep the bearing bush in a horizontal posture to complete the disassembly, avoiding the centering deviation between the bearing bush and the bearing housing hole during the suspension process.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special tool for lifting the big-end bearing shell of a connecting rod, characterized in that Including: A cross bar (2), and an airfoil clamping screw (1) arranged on the front surface of the cross bar (2), and bearing fixing plates (3) are installed on both sides of the upper surface of the cross bar (2); A vertical bar (4) is arranged at the center position of the upper surface of the cross bar (2), and large-end bearing guide plates (5) are installed on the front and back of the top end of the vertical bar (4).

2. The special lifting tool for the big end bearing shell of the connecting rod according to claim 1, characterized in that: The cross bar (2) includes a fixed bar (6), and side connecting rods (7) are connected to both sides of the fixed bar (6), and gears (8) are rotatably connected to both sides of the upper surface of the fixed bar (6).

3. The special lifting tool for the big end bearing shell of the connecting rod according to claim 2, characterized in that: Threaded lead screws (9) are additionally provided on the upper parts of both sides of the fixed bar (6), and limit plates (10) are installed on the lower parts of both sides of the fixed bar (6), and the limit plates (10) are integrally designed in an "I" shape.

4. The special lifting tool for the big end bearing shell of the connecting rod according to claim 3, characterized in that: The side connecting rods (7) are sleeved on the surfaces of the threaded lead screws (9), and the side connecting rods (7) are slidably connected to the limit plates (10).

5. A special lifting tool for the big end bearing shell of a connecting rod, as claimed in claim 1, wherein: The vertical bar (4) includes an upper connecting rod (11) and a lower connecting rod (12), and the upper connecting rod (11) is arranged at the top end of the lower connecting rod (12), and positioning holes (13) are opened on the upper parts of both sides of the lower connecting rod (12).

6. The special lifting tool for the big end bearing shell of the connecting rod according to claim 5, characterized in that: An extension rod (14) is slidably connected to the inner cavity of the lower connecting rod (12), and the extension rod (14) is connected to the upper connecting rod (11), and positioning insertion rods (15) are uniformly opened on both sides of the extension rod (14), and compression springs (16) are uniformly additionally provided in the inner cavity of the extension rod (14), both ends of the compression spring (16) are respectively connected to the surfaces of the corresponding positioning insertion rods (15), and the shapes and positions of the positioning insertion rods (15) correspond to those of the positioning holes (13).

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