Shield tunneling machine main drive speed reducer planet carrier axial positioning structure

Abstract

An axial positioning structure for a planet carrier of a main drive speed reducer of a shield tunneling machine relates to the technical field of main drive mechanical transmission of the shield tunneling machine and realizes dual functions of power transmission and axial positioning by matching a spline transmission of an inner hole of the planet carrier with a limiting baffle bolt connecting structure. Therefore, the technical problems that axial positioning of the speed reducer is unstable, the assembly technology is complex, and chipping interference is caused by retainer ring failure are effectively solved. In the axial positioning structure for the planet carrier of the main drive speed reducer of the shield tunneling machine, the split type limiting assembly is formed by contacting the stepped end face of a stepped positioning baffle machined by 45 # steel with the end face of an inner hole of the planet carrier to form an axial constraint pair, and axial positioning is achieved; and an axial gap of 0.5 mm is formed between the stepped positioning baffle and the planet carrier so as to realize a dynamic compensation mechanism.

Description

Technical Field

[0001] This utility model relates to the field of main drive mechanical transmission technology for tunnel boring machines, and in particular to an axial positioning structure for the planetary carrier of the main drive reducer of a tunnel boring machine. Background Technology

[0002] Currently, the main drive reducer of a tunnel boring machine (TBM) is generally used at the cutterhead. It is a very critical component of the machine, playing a role in transmitting power. Its quality and stability directly affect the safety performance and construction safety of the engineering machinery.

[0003] Due to the special nature of tunnel boring machines (TBMs), a gearbox malfunction during construction can easily lead to safety accidents and affect project progress; therefore, the operational stability of the reducer is a key concern. The inventors of this application have discovered three main technical defects in the existing technology for axial positioning of the planetary carrier in gearboxes:

[0004] 1. Snap ring positioning type: The planetary carrier is connected to the sun gear or the machine body by a snap ring. Under low-speed and heavy-load conditions, the snap ring is prone to failure due to uneven load.

[0005] 2. Integrated Component Type: The planetary carrier and the main body are designed as a single unit, which presents problems such as difficulty in blank forming and complex finishing processes, significantly increasing manufacturing costs;

[0006] 3. Misaligned baffle type: Bolts need to be installed in reverse and spline teeth misaligned assembly is required. The installation process is complicated and there is a risk of positioning deviation.

[0007] Analysis shows that the existing technology has significant shortcomings in terms of safety, stability, economy, and assembly efficiency. In addition, the existing technology cannot balance the axial positioning reliability and assembly process simplicity for the special requirement of maintaining a 1mm floating gap for the floating load sharing mechanism. Utility Model Content

[0008] The purpose of this utility model is to provide an axial positioning structure for the planetary carrier of the main drive reducer of a tunnel boring machine. It achieves the dual functions of power transmission and axial positioning through the spline transmission in the inner hole of the planetary carrier and the bolt connection of the limiting baffle. This effectively solves the technical problems of axial positioning instability of the reducer, complex assembly process and debris interference caused by the failure of the retaining ring.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An axial positioning structure for the planetary carrier of a tunnel boring machine main drive reducer includes: a split-type limiting component, wherein the stepped end face of a stepped positioning baffle machined from 45# steel contacts the inner hole end face of the planetary carrier to form an axial constraint pair and achieve axial positioning; a 0.5mm axial gap is provided between the stepped positioning baffle and the planetary carrier to achieve a dynamic compensation mechanism.

[0011] The stepped positioning baffle is connected to the sun gear by hexagonal socket head cap screws in the same direction.

[0012] Specifically, torque transmission is achieved through the inner spline of the planetary carrier output end and the sun gear, thereby decoupling the functions of torque transmission and axial positioning.

[0013] Compared with existing technologies, the axial positioning structure of the planetary carrier of the main drive reducer of the tunnel boring machine described in this utility model has the following advantages:

[0014] In the axial positioning structure of the planetary carrier of the main drive reducer for tunnel boring machines provided by this utility model, the stepped end face of the stepped positioning baffle machine machined from 45# steel contacts the inner hole end face of the planetary carrier to form an axial constraint pair and achieve axial positioning. Therefore, the use of a split-type limiting baffle structure not only has good axial positioning performance, but also effectively avoids the processing difficulty of the integral component. Since a 0.5mm axial gap is provided between the stepped positioning baffle and the planetary carrier to realize a dynamic compensation mechanism, it can effectively ensure the floating load-sharing performance, that is, it allows floating displacement while providing good limiting protection. Therefore, it can be seen that the axial positioning structure of the planetary carrier of the main drive reducer for tunnel boring machines provided by this utility model can effectively improve safety performance, economic performance, and assembly efficiency. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of the planetary carrier axial positioning structure of the main drive reducer of the tunnel boring machine provided in an embodiment of this utility model.

[0016] Figure label:

[0017] 1-Sun gear; 2-Planet carrier; 3-Hex socket head cap screw; 4-Stepped positioning baffle. Detailed Implementation

[0018] In existing planetary carrier axial fixing structures, the planetary carrier and the gearbox or the next-stage sun gear are usually connected and axially positioned by snap rings. Under low-speed, heavy-load conditions in the reducer, the uneven load transmission of the sun gear by the planetary gears can cause the snap rings to fail, thereby interfering with gear meshing and causing the reducer to fail. Furthermore, in existing planetary carrier axial fixing structures, the planetary carrier and the gearbox may be made into a single component for axial positioning. However, this positioning method has technical problems such as difficulty in forming the blank and complex finishing processes, resulting in high costs.

[0019] For ease of understanding, the axial positioning structure of the planetary carrier of the main drive reducer of the tunnel boring machine provided in this embodiment will be described in detail below with reference to the accompanying drawings.

[0020] This utility model embodiment provides an axial positioning structure for the planetary carrier of the main drive reducer of a tunnel boring machine, such as... Figure 1 As shown, it includes: a split-type limiting component, wherein the stepped end face of the stepped positioning baffle 4, which is machined from 45# steel, contacts the inner hole end face of the planetary carrier 2 to form an axial constraint pair and achieve axial positioning; a 0.5mm axial gap is provided between the stepped positioning baffle 4 and the planetary carrier 2 to realize a dynamic compensation mechanism.

[0021] Compared with the prior art, the axial positioning structure of the planetary carrier of the main drive reducer of the tunnel boring machine described in this embodiment has the following advantages:

[0022] In the axial positioning structure of the planetary carrier of the main drive reducer of the tunnel boring machine provided in this embodiment, the stepped end face of the stepped positioning baffle 4, machined from 45# steel, contacts the inner hole end face of the planetary carrier 2 to form an axial constraint pair and achieve axial positioning. Therefore, the split-type limiting baffle structure not only has good axial positioning performance, but also effectively avoids the processing difficulty of the integral component. Since a 0.5mm axial gap is provided between the stepped positioning baffle 4 and the planetary carrier 2 to realize a dynamic compensation mechanism, it can well ensure the floating load-sharing performance, that is, it allows floating displacement while providing good limiting protection. From this analysis, it can be seen that the axial positioning structure of the planetary carrier of the main drive reducer of the tunnel boring machine provided in this embodiment can effectively improve safety performance, improve economic performance, and improve assembly efficiency.

[0023] Among them, such as Figure 1 As shown, the stepped positioning baffle 4 and the sun gear 1 can be connected by unidirectional hexagonal socket bolts 3, thereby eliminating the need for reverse installation.

[0024] Specifically, such as Figure 1As shown, torque transmission can be achieved through the inner spline of the planetary carrier 2 output end and the sun gear 1, thereby decoupling the functions of torque transmission and axial positioning, and thus effectively improving the reliability of the system.

[0025] In summary, the axial positioning structure of the planetary carrier of the main drive reducer for tunnel boring machines provided in this embodiment of the invention has the following advantages:

[0026] 1. The decoupling design of the spline drive and bolt connection system effectively eliminates the influence of torque on the positioning structure;

[0027] Second, the axial force is evenly distributed and borne by multiple bolts, which significantly improves the impact resistance.

[0028] Third, standardized component design effectively reduces processing difficulty and production costs;

[0029] Fourth, the assembly process is reduced and no special tooling is required.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A shield tunneling machine main drive reducer planetary carrier axial positioning structure, characterized in that, include: The split-type limiting assembly consists of a stepped end face of a stepped positioning baffle made of 45# steel that contacts the inner hole end face of the planetary carrier to form an axial constraint pair and achieve axial positioning; a 0.5mm axial gap is provided between the stepped positioning baffle and the planetary carrier to realize a dynamic compensation mechanism.

2. The shield machine main drive reducer planet carrier axial positioning structure according to claim 1, characterized in that, The stepped positioning baffle is connected to the sun gear by hexagonal socket head cap screws in the same direction.

3. The shield machine main drive reducer planet carrier axial positioning structure according to claim 2, characterized in that, Torque transmission is achieved through the inner spline at the output end of the planetary carrier and the sun gear, thereby decoupling the functions of torque transmission and axial positioning.

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