A hole system two-way positioning tool and positioning method for a marine engine bearing shell

Abstract

The present application relates to the technical field of bearing shell positioning, in particular to a hole system bidirectional positioning tool and method for bearing shell of marine engine. It comprises a positioning plate and a tool base, the positioning plate is fixed with the bearing shell through positioning pins, and a V-shaped groove is opened on the lower surface, and the tool base is provided with load-bearing ball plunger and positioning ball plunger. The positioning method comprises: fixing the positioning plate on the bottom of the bearing shell by the robot and hoisting it to the tool base; releasing the locking of the positioning ball plunger, so that it pops out; after positioning is completed, the load-bearing ball plunger is controlled to descend, the load is transferred to the tool base, and the positioning ball plunger is relocked. The present application is adapted to the lightweight structure of the bearing shell, and the positioning efficiency and accuracy are improved through bidirectional step positioning combined with the robot, the processing quality is guaranteed, and the operation difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of bearing housing positioning technology, and more specifically, to a bidirectional positioning fixture and method for the bore system of a marine engine bearing housing. Background Technology

[0002] In shipbuilding, the precise machining of the bore system in bearing housings, as a critical large structural component, has always been a significant challenge. These bearing housings typically refer to heavy load-bearing components connected to the outside of the engine output shaft, extending power transmission to the propeller. They are enormous and complex, often weighing several tons or even tens of tons. Traditional positioning and adjustment methods are inadequate for such heavy workpieces. Operators usually need to rely on cranes and pry bars for repeated adjustments, which is not only extremely time-consuming and inefficient but also exposes operators to high-risk working environments such as slippage and crushing of heavy objects. Furthermore, to reduce overall weight and meet the requirements of lightweight ship design, modern bearing housings generally employ complex hollow and stiffened structures. While this design optimizes weight performance, it results in irregular curved surfaces or numerous hollow areas at the bottom, failing to provide a complete and continuous reference plane for traditional rigid positioning and support mechanisms.

[0003] This structural characteristic makes it difficult to directly apply many advanced precision positioning technologies. For example, while fine-tuning schemes using arrayed ball bearings can greatly reduce moving friction resistance, their normal operation depends on a relatively flat contact surface at the bottom of the workpiece. For bearing housings with numerous hollows or irregular curved surfaces on the bottom, the balls cannot obtain stable support; they either become trapped in the holes and lose their function, or they can only form point contact with a few protrusions, resulting in huge contact stress. This can easily crush the balls or damage the machined surface of the workpiece, making smooth and controllable precision fine-tuning impossible. Therefore, how to overcome the movement problem caused by the workpiece's own weight, while effectively addressing the irregular support problem caused by its lightweight design at the bottom, has become a core technical bottleneck that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional positioning fixture and method for the hole system of a marine engine bearing housing, so as to solve the problem of difficult positioning and adjustment caused by the excessive weight and irregular bottom structure of heavy bearing housings.

[0005] To achieve the above objectives, one objective of this invention is to provide a bidirectional positioning fixture for the bore system of a marine engine bearing housing, comprising:

[0006] The positioning plate has threaded holes on both sides for connecting with the bearing housing, and V-grooves are formed on both sides of the lower surface of the positioning plate.

[0007] A locating pin is used to pass through the mounting hole of the bearing housing and connect with the threaded hole of the locating plate. A movable pin is slidably connected inside the locating pin.

[0008] Tooling base, on which are provided:

[0009] Multiple sets of load-bearing ball plungers are arranged in an array to support the positioning plate;

[0010] Two rows of positioning ball plungers are respectively set on both sides of the tooling base, and their positions correspond to the V-groove. They are used to engage with the V-groove to achieve positioning in the first direction.

[0011] Positioning holes are provided on both sides of the tooling base to engage with movable pins on the positioning plate to achieve positioning in a second direction.

[0012] In the above technical solution, an intermediate positioning plate transforms the irregular and discontinuous support datum at the bottom of the bearing housing into a unified and precise tooling positioning datum. The lower surface of the positioning plate is precision-machined to form a flat datum surface, enabling it to stably engage with the ball plungers. The V-grooves on both sides of its bottom engage with the positioning ball plungers, utilizing the symmetrical guiding characteristics of the V-grooves to achieve automatic alignment of the workpiece in the lateral direction, completing the "line positioning" in the first direction. Simultaneously, the movable pin inside the positioning pin falls into the positioning hole of the tooling base under gravity, achieving "point positioning" in the second direction, thus jointly constraining all degrees of freedom of the workpiece in the horizontal plane. Furthermore, the arrayed load-bearing ball plungers convert sliding friction into rolling friction, overcoming the movement resistance caused by the workpiece's own weight, facilitating the movement of heavy workpieces.

[0013] Based on this, the load-bearing ball plunger is fixedly installed on the retaining plate, and a hydraulic cylinder is provided below the retaining plate, with the piston rod of the hydraulic cylinder fixedly connected to the bottom of the retaining plate;

[0014] The retaining plate has a mesh structure, and the load-bearing ball plunger is fixedly installed at the node of the mesh structure.

[0015] The tooling base is fixedly installed with multiple sets of support bosses, the positions of which correspond to the grid gaps of the retaining plate.

[0016] This technical solution utilizes a liftable rigid support structure to facilitate the transition between two working conditions: workpiece positioning and adjustment, and stable machining. Load-bearing ball plungers are fixedly mounted on a retaining plate, with their lifting and lowering controlled by a hydraulic cylinder. The retaining plate employs a grid structure, fixing the load-bearing ball plungers to the grid nodes to ensure uniform support and provide space for the support bosses to pass through. When positioning is complete and machining is imminent, the hydraulic cylinder drives the retaining plate downwards, allowing the support bosses to pass through the grid gaps and protrude from the upper surface of the balls. This smoothly transfers the workpiece load from the ball support to the rigid base, satisfying the need for low-friction fine-tuning during positioning while ensuring the system rigidity and stability required for subsequent machining, and avoiding the risk of damage to the balls due to impact loads during processing.

[0017] In another technical solution, a spring is provided at the bottom of the positioning ball plunger, and the positioning ball plunger is elastically and telescopically installed in the tooling base by means of the spring;

[0018] The tooling base is provided with a locking mechanism for locking the positioning ball plunger in the retracted state, including:

[0019] A slot is formed on the housing of the positioning ball plunger;

[0020] A locking plate that mates with the slot;

[0021] The locking plate is provided with a rack, which meshes with a gear, and the driving end of the gear is a motor.

[0022] This technical solution uses a positioning ball plunger that can be elastically and retractably mounted within the base via a bottom spring, enabling it to automatically pop out for alignment. The matching locking mechanism, through a slot and locking plate, locks the plunger in the retracted state, preventing accidental interference during non-positioning stages such as hoisting. The locking plate employs rack and pinion transmission and is driven by a motor, allowing for remote control of the mechanical locking. This automates the entire positioning process, ensuring the flexibility and adaptability of the ball plunger during positioning, and also guaranteeing the safety and stability of the positioning system when not in operation.

[0023] The second objective of this invention is to provide a method for positioning the bore system of a marine engine bearing housing, applicable to the bidirectional positioning fixture for the bore system of the marine engine bearing housing described in any of the above-mentioned embodiments, comprising the following method steps:

[0024] S1. Fix the positioning plate to the bottom of the bearing housing using positioning pins, and then hoist the bearing housing with the positioning plate installed onto the tooling base.

[0025] S2. Release the lock on the positioning ball plunger and let it pop out. Adjust the position of the bearing housing and the positioning plate assembly so that the V-groove at the bottom of the positioning plate engages with the balls of the popped-out positioning ball plunger to complete the positioning in the first direction.

[0026] S3. Push the component so that the movable pin inside the positioning pin falls into the positioning hole of the tooling base to complete the positioning in the second direction.

[0027] S4. After positioning is completed, control the load-bearing ball plunger to descend and transfer the workpiece load to the tooling base body; at the same time, relock the positioning ball plunger.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. This invention relates to a two-way positioning fixture and method for the bore system of marine engine bearing housings, adapted to the positioning requirements of bearing housings with irregular bottom structures due to lightweight design. The invention utilizes a positioning plate whose upper surface mates with the irregular bottom surface of the bearing housing, while its lower surface is precision milled to form a flat reference surface, ensuring stable fit with the ball plunger. Combined with the V-groove at the bottom of the positioning plate and the fitting design of the positioning ball plunger, the invention effectively avoids interference from the bearing housing's own structure on positioning, achieving stable positioning of complex workpieces.

[0030] 2. In the bidirectional positioning fixture and method for the bore system of the marine engine bearing housing, the bidirectional positioning design improves the positioning accuracy of the bearing housing bore system and reduces repeated trial and error. In the first direction of positioning, the 90-degree V-groove at the bottom of the positioning plate engages with the positioning ball plunger. The symmetrical structure of the V-groove guides the ball to automatically embed into the bottom of the groove. Simultaneously, a proximity switch monitors the positioning status in real time, ensuring stable and controllable lateral alignment accuracy. The second direction of positioning is achieved through the engagement of a movable pin within the positioning pin and the positioning hole in the fixture base. The tapered guide at the top of the positioning hole generates radial guiding force, actively guiding the movable pin to accurately slide into the positioning hole during its movement. The entire bidirectional positioning process eliminates the need for repeated manual calibration, directly providing a high-precision benchmark for bore system machining, reducing the probability of machining problems caused by positioning deviations, and ensuring stable machining quality.

[0031] 3. In the two-way positioning tooling and positioning method of the bore system of the marine engine bearing housing, the combination design of the positioning plate and the ball plunger is used to support the workpiece and reduce the moving friction resistance by using the load-bearing ball plunger. The operator does not need to pry the heavy workpiece at close range. The positioning can be completed with only fine adjustment, which greatly reduces the operation intensity and avoids the safety hazards of close contact between personnel and heavy workpieces, thus improving the safety of operation and positioning efficiency. Attached Figure Description

[0032] Figure 1 This is a front view of the overall structure of the present invention;

[0033] Figure 2 This is a side view of the overall structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the disassembled assembly structure of the present invention;

[0035] Figure 4 This is a cross-sectional structural diagram of the overall structure of the present invention;

[0036] Figure 5 For the present invention Figure 4 Enlarged view of part A in the image;

[0037] Figure 6 This is a schematic diagram of the structure of the retaining plate of the present invention.

[0038] The meanings of the labels in the diagram are as follows:

[0039] 1. Bearing housing; 2. Positioning plate; 21. Threaded hole; 22. V-groove; 3. Tooling base; 31. Positioning hole; 32. Load-bearing ball plunger; 33. Retaining plate; 34. Hydraulic cylinder; 35. Positioning ball plunger; 36. Slot; 37. Spring; 38. Locking plate; 39. Gear; 4. Positioning pin; 41. Thread; 42. Movable pin; 43. Sliding ball. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-2 As shown, one of the objectives of this embodiment is to provide a bidirectional positioning fixture for the bore system of a marine engine bearing housing, including a positioning plate 2 and a fixture base 3. Figure 3 As shown, the positioning plate 2 has threaded holes 21 on both sides, corresponding to the mounting holes on both sides of the bearing housing 1 for fixing. The bearing housing 1 and the positioning plate 2 are fixedly connected by positioning pins 4. The positioning pins 4 have threads 41, which pass through the mounting holes of the bearing housing 1 and engage with the threaded holes 21 of the positioning plate 2 to form a rigid connection. A movable pin 42 is also slidably connected inside the positioning pin 4. The tooling base 3 has positioning holes 31 on both sides corresponding to the movable pins 42. When the centers of the mounting holes of the bearing housing 1, the threaded holes 21 of the positioning plate 2, and the positioning holes 31 of the tooling base 3 are on the same axis, the movable pins 42 fall into the positioning holes 31 under the action of gravity, realizing fixing and positioning calibration.

[0042] The positioning plate 2 serves as a transition component connecting the bearing housing 1 and the tooling base 3. The upper surface of the plate is a mounting surface that mates with the bottom of the bearing housing 1. It is connected and fixed to the pre-machined mounting holes of the bearing housing 1 via threaded holes 21 on both sides. The lower surface of the plate is precision milled to control overall flatness and reduce friction during fine-tuning with the ball bearings. V-grooves 22 are formed on both sides of the lower surface of the positioning plate 2, with an included angle of 90 degrees. The groove surfaces undergo surface hardening and fine grinding to reduce the surface roughness Ra value, providing a wear-resistant and low-friction guide surface. The 90-degree included angle of the V-grooves 22 provides symmetry. When the V-grooves 22 contact the balls of the positioning ball plunger 35, the contact point between the groove wall and the ball forms a stable isosceles right triangle. This symmetrical structure ensures that the guiding force on both sides is equal in magnitude and symmetrical in direction when the workpiece moves laterally, thus enabling it to automatically find and stabilize at the center line position of the ball bearing array. The 90-degree angle decomposes the vertical load into two equal normal components, avoiding local stress concentration. This protects the ball surface from being crushed and ensures a uniform distribution of contact stress.

[0043] like Figure 4 As shown, the tooling base 3 is designed to cooperate with the positioning plate 2 for fixing and positioning. A load-bearing ball plunger 32 is located at the center of the tooling base 3. The load-bearing ball plunger 32 is composed of high-strength alloy steel balls and threaded sleeves, and is uniformly fixed on the retaining plate 33 in a matrix configuration. Figure 6 As shown, the retaining plate 33 has a grid structure, and the load-bearing ball plungers 32 are fixedly installed on each node to ensure uniform stress distribution when bearing workpiece loads and avoid local stress concentration. Multiple sets of hydraulic cylinders 34 are installed at the bottom of the retaining plate 33. The piston rods of the hydraulic cylinders 34 are fixedly connected below the nodes of the retaining plate 33. After the bearing housing 1 is positioned, the hydraulic rods of the hydraulic cylinders 34 retract, causing the retaining plate 33 to descend. This causes the balls of the load-bearing ball plungers 32 to fall slightly below the upper plane of the tooling base 3, so that the weight of the workpiece is no longer borne by the retaining plate 33 and the balls, allowing them to fall onto the upper plane of the tooling base 3. The tooling base 3 is designed with an array of support bosses for the grid structure of the retaining plate 33, which complement the grid gaps of the retaining plate 33. When the positioning operation is completed and the retaining plate 33 descends under the drive of the hydraulic cylinders 34, these support bosses pass through the grid gaps and protrude from the upper surface of the balls. At this time, the weight of the bearing housing 1 (through the positioning plate 2) is transferred from the load-bearing ball plunger 32 to the support boss, and the force flow path is changed to pass directly through the body of the tooling base 3, providing system rigidity for subsequent processing, rather than letting the ball bear the weight, thus avoiding the plastic deformation or damage that may occur when the ball is subjected to dynamic impact loads during processing.

[0044] like Figure 4As shown, a row of positioning ball plungers 35 is provided on both sides of the tooling base 3. The positions of the positioning ball plungers 35 correspond to the V-shaped grooves 22 opened on the lower surface of the positioning plate 2. A spring 37 is also provided at the bottom of the positioning ball plungers 35. Figure 5 As shown, the positioning ball plunger 35 is composed of an alloy steel shell and precision balls. A groove 36 is provided on one side of the alloy steel shell. The positioning ball plunger 35 is locked in the groove 36 by a locking plate 38. The locking plate 38 has a rack that meshes with a gear 39. The drive end of the gear 39 is a motor. The motor rotates the gear 39 to drive the locking plate 38 to disengage from the groove 36 and unlock.

[0045] When the bearing housing 1 and the positioning plate 2 are hoisted onto the tooling base 3, the V-groove 22 on the lower surface of the positioning plate 2 is first roughly aligned with the array of positioning ball plungers 35 on both sides of the tooling base 3. This drives the gear 39 to rotate, causing the locking plate 38 to disengage from the slot 36 of the positioning ball plunger 35, releasing the mechanical lock. The spring 37 then causes the positioning ball plunger 35 to pop out. Afterward, the position of the positioning plate 2 is finely adjusted. When the ball is fully engaged at the uppermost end (i.e., the bottom of the groove) of the V-groove 22, the positioning ball plunger 35 reaches the fully ejected state. At this point, the workpiece has achieved precise centering in the transverse (X-axis) direction. To monitor the positioning status, a non-contact proximity switch is also installed in the tooling base 3. Its installation position corresponds to the bottom area when the positioning ball plunger 35 is fully ejected. When the positioning ball plunger 35 is fully ejected, the metal shell rises and moves out of the sensing range of the proximity switch. The proximity switch cannot detect the metal signal at this time and determines that the X-axis alignment of the workpiece is completed. It then triggers the sound and light indicator light to issue a prompt, and the operator can confirm that the X-axis positioning is successful.

[0046] Finally, the workpiece is adjusted along the Y-axis. The workpiece is pushed longitudinally for adjustment, and the movable pin 42 remains drooping under gravity, with its bottom sliding ball 43 contacting the upper plane of the tooling base 3. (Example:) Figure 3 and Figure 4As shown, the uppermost end of the positioning hole 31 of the tooling base 3 is also provided with a tapered guide opening. When the movable pin 42 moves directly above the positioning hole 31, the sliding ball 43 first contacts the tapered guide opening at the top of the positioning hole 31. The tapered surface generates a radial guiding force, guiding the movable pin 42 to slide into the straight hole until the movable pin 42 falls completely into the positioning hole 31 under the action of gravity. A proximity switch is also provided in the positioning hole 31 to monitor the positioning status. When the movable pin 42 is fully inserted into the positioning hole 31, the sensing ring at the top of the movable pin 42 enters the proximity switch detection area, triggering the switch to generate an electrical signal and transmitting it to the control system. This sends a positioning completion command to the hydraulic system, and the hydraulic cylinder 34 pushes the retaining plate 33 downward, causing all the load-bearing ball plungers 32 to retract synchronously. The weight of the workpiece is completely transferred from the ball support to the rigid plane of the tooling base 3. At the same time, the positioning ball plunger 35 is also pressed and moves downward, returning to its initial position. The motor-driven gear 39 drives the locking plate 38 to engage with the slot 36 of the positioning ball plunger 35, preventing the positioning ball plunger 35 from being affected during processing.

[0047] The second objective of this embodiment is to provide a method for positioning the bore system of a marine engine bearing housing, including a bidirectional positioning fixture for the bore system of a marine engine bearing housing as described above, comprising the following method steps:

[0048] S1. Fix the positioning plate 2 to the bottom of the bearing housing 1 using the positioning pin 4, and hoist the bearing housing 1 with the positioning plate 2 installed onto the tooling base 3.

[0049] S2. Release the lock on the positioning ball plunger 35 so that it pops out, adjust the position of the bearing housing 1 and the positioning plate 2 assembly so that the V-groove 22 at the bottom of the positioning plate 2 engages with the ball of the popped-out positioning ball plunger 35 to complete the positioning in the first direction.

[0050] S3. Push the component so that the movable pin 42 inside the positioning pin 4 falls into the positioning hole 31 of the tooling base 3 to complete the positioning in the second direction.

[0051] S4. After positioning is completed, control the load-bearing ball plunger 32 to descend and transfer the workpiece load to the tooling base 3 body; at the same time, relock the positioning ball plunger 35.

[0052] In summary, the overall working principle of this invention is as follows:

[0053] The positioning process of this invention achieves positioning through two independent and sequential steps. First, the bearing housing 1 with the positioning plate 2 is hoisted onto the tooling base 3. At this time, the positioning ball plunger 35 is in a locked state, and the balls of the load-bearing ball plunger 32 protrude to support the workpiece.

[0054] When the positioning program is started, lateral positioning is performed first. The motor drives the gear 39 to rotate, causing the locking plate 38 to disengage from the slot 36 of the positioning ball plunger 35. Under the action of the spring 37, the positioning ball plunger 35 pops upward. The operator fine-tunes the workpiece position so that the V-groove 22 at the bottom of the positioning plate 2 contacts the popped-out positioning balls. Due to the special geometry of the V-groove 22, the workpiece will automatically center itself during lateral movement. When all positioning balls are embedded in the bottom of the corresponding V-groove 22, lateral positioning is completed. At this time, the positioning ball plunger 35 rises to its highest position, triggering the proximity switch to send a positioning success signal.

[0055] Next, longitudinal positioning is performed. The operator pushes the workpiece longitudinally, and the movable pin 42 inside the positioning pin 4 remains hanging down under the action of gravity, while the sliding ball 43 at its bottom slides on the surface of the tooling base 3. When the movable pin 42 moves above the positioning hole 31, the sliding ball 43 first contacts the tapered guide at the top of the positioning hole 31. Guided by the tapered surface, the movable pin 42 accurately slides into the positioning hole 31. After the movable pin 42 has completely fallen into the positioning hole 31, the sensing ring at its top triggers the proximity switch, confirming that the longitudinal positioning is complete.

[0056] Once bidirectional positioning is achieved, the system enters the locking phase. Hydraulic cylinder 34 pushes retaining plate 33 downwards, causing all load-bearing ball plungers 32 to retract synchronously, completely transferring the workpiece's weight from the ball supports to the rigid plane of the tooling base 3. Simultaneously, positioning ball plungers 35 move downwards under pressure, the motor rotates in the opposite direction, driving locking plate 38 to re-engage in slot 36, completing the mechanical locking of the entire positioning system and providing a stable and reliable reference for subsequent processing.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional positioning tooling for the bore system of a marine engine bearing housing, characterized in that, include: The positioning plate (2) has threaded holes (21) on both sides for connecting with the bearing housing (1), and V-grooves (22) are provided on both sides of the lower surface of the positioning plate (2). A positioning pin (4) is used to pass through the mounting hole of the bearing housing (1) and connect with the threaded hole (21) of the positioning plate (2). A movable pin (42) is slidably connected inside the positioning pin (4). Tooling base (3), on which are provided: Multiple sets of load-bearing ball plungers (32) are arranged in an array to support the positioning plate (2). Two rows of positioning ball plungers (35) are respectively set on both sides of the tooling base (3), and their positions correspond to the V-groove (22) for fitting with the V-groove (22) to achieve positioning in the first direction; Positioning holes (31) are provided on both sides of the tooling base (3) to cooperate with the movable pins (42) on the positioning plate (2) to achieve positioning in the second direction; The load-bearing ball plunger (32) is fixedly installed on the retaining plate (33), and a hydraulic cylinder (34) is provided below the retaining plate (33). The piston rod of the hydraulic cylinder (34) is fixedly connected to the bottom of the retaining plate (33). The tooling base (3) is fixedly installed with multiple sets of support bosses, the positions of which correspond to the grid gaps of the retaining plate (33); The bottom of the positioning ball plunger (35) is provided with a spring (37), and the positioning ball plunger (35) can be elastically and telescopically installed in the tooling base (3) by means of the spring (37); The tooling base (3) is provided with a locking mechanism for locking the positioning ball plunger (35) in the retracted state, including: A slot (36) is formed on the housing of the positioning ball plunger (35); A locking plate (38) that cooperates with the slot (36); The locking plate (38) is provided with a rack, which meshes with a gear (39), and the driving end of the gear (39) is a motor; When the bearing housing (1) and the positioning plate (2) are placed on the tooling base (3) by hoisting, the V-groove (22) on the lower surface of the positioning plate (2) is first roughly aligned with the array of positioning ball plungers (35) on both sides of the tooling base (3), driving the gear (39) to rotate, driving the locking plate (38) to exit from the slot (36) of the positioning ball plunger (35), releasing the mechanical lock, and the spring (37) causes the positioning ball plunger (35) to pop out. Then, the position of the positioning plate (2) is finely adjusted. When the ball is fully inserted into the uppermost part of the V-groove (22), the positioning ball plunger (35) reaches the fully popped state. At this time, the workpiece has achieved precise centering in the transverse direction.

2. The bidirectional positioning fixture for the bore system of a marine engine bearing housing according to claim 1, characterized in that: The retaining plate (33) has a mesh structure, and the load-bearing ball plunger (32) is fixedly installed at the node of the mesh structure.

3. The bidirectional positioning fixture for the bore system of a marine engine bearing housing according to claim 1, characterized in that: The bottom of the movable pin (42) is provided with a sliding ball (43).

4. The bidirectional positioning fixture for the bore system of a marine engine bearing housing according to claim 1, characterized in that: The top of the positioning hole (31) is provided with a tapered guide opening.

5. A bidirectional positioning method for the bore system of a marine engine bearing housing, applied to the bidirectional positioning fixture for the bore system of a marine engine bearing housing as described in any one of claims 1-4, characterized in that: The methods and steps include the following: S1. Fix the positioning plate (2) to the bottom of the bearing housing (1) by the positioning pin (4), and hoist the bearing housing (1) with the positioning plate (2) installed onto the tooling base (3); S2. Release the lock on the positioning ball plunger (35) so that it pops out. Adjust the position of the bearing housing (1) and the positioning plate (2) assembly so that the V-groove (22) at the bottom of the positioning plate (2) engages with the ball of the popped-out positioning ball plunger (35) to complete the positioning in the first direction. S3. Push the component so that the movable pin (42) inside the positioning pin (4) falls into the positioning hole (31) of the tooling base (3) to complete the positioning in the second direction; S4. After positioning is completed, control the load-bearing ball plunger (32) to descend and transfer the workpiece load to the tooling base (3) body; at the same time, re-lock the positioning ball plunger (35).

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