Asymmetric double-row cylindrical roller bearing and heading machine comprising same

Abstract

The utility model belongs to the technical field of main bearings of heading machines, and particularly provides an asymmetric double-row cylindrical roller bearing and a heading machine comprising the same, the asymmetric double-row cylindrical roller bearing comprises an outer ring, a first inner ring, a second inner ring, a main push roller arranged between the outer ring and the first inner ring, and an auxiliary push roller arranged between the outer ring and the second inner ring; the first inner ring and the second inner ring are connected with each other to form an inner ring structure; the inner ring structure is sleeved on the outer ring; an included angle of more than 90 degrees and less than 180 degrees is formed between the axial central axis of the main pushing roller and the axial central axis of the auxiliary pushing roller; the diameter of the main pushing roller is larger than that of the auxiliary pushing roller, and the axial length of the main pushing roller is larger than that of the auxiliary pushing roller. Key parameters of the main pushing roller and the auxiliary pushing roller are oppositely set, so that the main pushing roller and the auxiliary pushing roller can adapt to overturning moment under the extreme unbalance loading working condition of the cutterhead.

Description

Technical Field

[0001] This utility model belongs to the technical field of tunneling machine main bearings, and relates to an asymmetric double-row cylindrical roller bearing and a tunneling machine containing the same. Background Technology

[0002] The main drive of a tunneling machine is one of its key components. The main drive bearing bears the propulsion force of the tunneling machine and provides torque for the cutterhead to cut the rock. Its working environment is harsh and it needs to withstand large vibration and impact loads. The load-bearing capacity and reliability of the main drive bearing directly affect the service life of the main drive and the entire tunneling machine.

[0003] With the increasingly widespread application of TBMs (Tunnel Boring Machines), higher demands are being placed on the space constraints and load requirements of the main drive bearings, especially on small-diameter TBMs, which experience greater loads and impact vibrations, requiring bearings with higher load-bearing capacity and smaller size. Currently, the main drive bearings of existing TBMs generally use three-row in-line roller bearings, which are large and heavy, and have low load-bearing capacity. Under high-load conditions, the lifespan of three-row cylindrical roller bearings will be significantly reduced, failing to meet the requirements. Using asymmetric double-row cylindrical roller bearings can meet the requirements of high-load operation. Utility Model Content

[0004] The present invention aims to design an asymmetric double-row cylindrical roller bearing for use in the main drive of a tunneling machine and a tunneling machine containing the bearing, so as to solve the problems of large bearing space and insufficient load-bearing capacity in the existing tunneling machine under the conditions of increasing space constraints and load requirements in the main drive.

[0005] This utility model provides an asymmetric double-row cylindrical roller bearing, including an outer ring, a first inner ring, a second inner ring, a main push roller disposed between the outer ring and the first inner ring, and an auxiliary push roller disposed between the outer ring and the second inner ring;

[0006] The first inner ring and the second inner ring are connected to each other to form an inner ring structure; the inner ring structure is fitted onto the outer ring.

[0007] The axial center axis of the main push roller and the axial center axis of the auxiliary push roller are set at an angle greater than 90° and less than 180°; and the diameter of the main push roller is greater than the diameter of the auxiliary push roller, and the axial length of the main push roller is greater than the axial length of the auxiliary push roller.

[0008] Preferably, the outer ring includes an outer ring body and a first main push contact surface and a first auxiliary push contact surface disposed on the outer ring body;

[0009] The first main push contact surface is used to make contact with the main push roller, the first auxiliary push contact surface is used to make contact with the auxiliary push roller, and the angle between the first main push contact surface and the radial center axis of the outer ring body is greater than the angle between the first auxiliary push contact surface and the radial center axis of the outer ring body.

[0010] Preferably, a second main push contact surface is provided on the first inner ring for contacting with the main push roller. The second main push contact surface and the first main push contact surface are arranged parallel to each other and cooperate with each other to form a main push raceway for mounting the main push roller.

[0011] The second inner ring is provided with a second auxiliary push contact surface for contacting the auxiliary push roller. The second auxiliary push contact surface and the first auxiliary push contact surface are arranged parallel to each other and cooperate with each other to form an auxiliary push raceway for mounting the auxiliary push roller.

[0012] Preferably, both the first inner ring and the second inner ring are modularly designed, with adjacent modular parts connected by bolts, and the adjacent modular parts are positioned by a stepped stop structure.

[0013] Preferably, the axial length of the first inner ring is set to 1.5-2 times the axial length of the second inner ring.

[0014] Furthermore, the asymmetric double-row cylindrical roller bearing also includes a main thrust cage and an auxiliary thrust cage;

[0015] The main pusher cage is provided with several main pusher rollers arranged at intervals between each other;

[0016] The auxiliary pusher retainer is provided with several auxiliary pusher rollers arranged at intervals.

[0017] This utility model also provides a tunneling machine, including the asymmetric double-row cylindrical roller bearing as described above;

[0018] When the tunneling machine is used for tunneling in soft soil layers, the diameter of the main thrust roller is set to 1.3-1.5 times the diameter of the auxiliary thrust roller, the axial length of the main thrust roller is set to 1.5-2 times the axial length of the auxiliary thrust roller, and the angle between the main thrust roller and the radial center axis of the outer ring body is greater than the angle between the auxiliary thrust roller and the radial center axis of the outer ring body by 40°-60°.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This utility model sets the diameter of the main push roller to be greater than the diameter of the auxiliary push roller, sets the axial length of the main push roller to be greater than the axial length of the auxiliary push roller, and sets the tilt angle of the auxiliary push roller to be less than the tilt angle of the main push roller, so that it can adapt to the overturning moment under the extreme off-center load condition of the cutter head.

[0021] (2) This utility model sets the parameters of the main push roller and the auxiliary push roller (both parameters of the main push roller and the auxiliary push roller include diameter, tilt angle and axial length) in different ways so that they can meet the high load requirements of TBM tunneling machine and greatly improve the bearing life; under the same diameter, compared with the three-row cylindrical roller bearing in the prior art, the asymmetric double-row cylindrical roller bearing provided by this utility model can decompose the force into axial and perpendicular forces when it is simultaneously subjected to axial and radial forces by adjusting the roller parameters, so it can withstand greater axial and radial loads.

[0022] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 This is a cross-sectional schematic diagram of an asymmetric double-row cylindrical roller bearing according to an embodiment of this utility model;

[0025] Figure 2 yes Figure 1 Cross-sectional schematic diagram of the middle and outer rings;

[0026] in:

[0027] 1. Outer ring; 1.1. Outer ring body; 1.2. First main push contact surface; 1.3. First auxiliary push contact surface; A. Radial center axis of the outer ring body; 2. First inner ring; 3. Second inner ring; 4. Main push roller; 5. Auxiliary push roller. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this utility model clearer and easier to understand, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that the accompanying drawings of this utility model are all in a simplified form and use non-precise proportions, and are only used to facilitate and clearly assist in illustrating the implementation of this utility model; the "several" mentioned in this utility model are not limited to the specific number shown in the examples in the drawings; the directions or positional relationships indicated by "front," "middle," "rear," "left," "right," "up," "down," "top," "bottom," and "middle" mentioned in this utility model are all based on the directions or positional relationships shown in the accompanying drawings of this utility model, and do not indicate or imply that the device or component referred to must have a specific orientation, nor should they be construed as limitations on this utility model.

[0029] Example:

[0030] See Figure 1 As shown, the asymmetric double-row cylindrical roller bearing provided by this utility model includes an outer ring 1, a first inner ring 2, a second inner ring 3, a main push roller 4 disposed between the outer ring 1 and the first inner ring 2, and an auxiliary push roller 5 disposed between the outer ring 1 and the second inner ring 3.

[0031] The first inner ring 2 and the second inner ring 3 are connected to each other to form an inner ring structure; the inner ring structure is fitted onto the outer ring 1.

[0032] The axial center axis of the main push roller 4 and the axial center axis of the auxiliary push roller 5 are set at an angle greater than 90° and less than 180°; and the diameter of the main push roller 4 is greater than the diameter of the auxiliary push roller 5, and the axial length of the main push roller 4 is greater than the axial length of the auxiliary push roller 5. Preferably, the first inner ring 2 is located on the side closer to the cutterhead of the tunneling machine, and the second inner ring 3 is located on the side closer to the drive end of the main drive of the tunneling machine.

[0033] Preferred, see Figure 2 As shown, the outer ring 1 includes an outer ring body 1.1 and a first main push contact surface 1.2 and a first auxiliary push contact surface 1.3 disposed on the outer ring body 1.1;

[0034] The first main push contact surface 1.2 is used to make contact with the main push roller 4, and the first auxiliary push contact surface 1.3 is used to make contact with the auxiliary push roller 5. The angle between the first main push contact surface 1.2 and the radial central axis A of the outer ring body is greater than the angle between the first auxiliary push contact surface 1.3 and the radial central axis A of the outer ring body.

[0035] Preferably, the first inner ring 2 is provided with a second main push contact surface for contacting the main push roller 4. The second main push contact surface and the first main push contact surface 1.2 are arranged parallel to each other and cooperate with each other to form a main push raceway for mounting the main push roller 4.

[0036] Preferably, the second inner ring 3 is provided with a second auxiliary push contact surface for contacting the auxiliary push roller 5. The second auxiliary push contact surface and the first auxiliary push contact surface 1.3 are arranged parallel to each other and cooperate with each other to form an auxiliary push raceway for mounting the auxiliary push roller 5.

[0037] More preferably, when a tunneling machine including the asymmetric double-row cylindrical roller bearing is used for tunneling in soft soil, the diameter of the main thrust roller 4 is set to 1.3-1.5 times the diameter of the auxiliary thrust roller 5, the axial length of the main thrust roller 4 is set to 1.5-2 times the axial length of the auxiliary thrust roller 5, and the angle between the main thrust roller 4 and the radial central axis A of the outer ring body is greater than the angle between the auxiliary thrust roller 5 and the radial central axis A of the outer ring body by 40°-60°.

[0038] More preferably, both the first inner ring 2 and the second inner ring 3 are arranged in blocks, with adjacent blocks connected by bolts, and the adjacent blocks are positioned by a stepped stop structure.

[0039] More preferably, the axial length of the first inner ring 2 is set to 1.5-2 times the axial length of the second inner ring 3.

[0040] In addition to the above structure, the asymmetric double-row cylindrical roller bearing also includes a main thrust cage and an auxiliary thrust cage;

[0041] The main pusher cage is provided with several main pusher rollers 4 arranged at intervals between each other;

[0042] The auxiliary pusher retainer is provided with several auxiliary pusher rollers 5 arranged at intervals.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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. An asymmetrical double-row cylindrical roller bearing, characterized in that, It includes an outer ring (1), a first inner ring (2), a second inner ring (3), a main push roller (4) disposed between the outer ring (1) and the first inner ring (2), and an auxiliary push roller (5) disposed between the outer ring (1) and the second inner ring (3); The first inner ring (2) and the second inner ring (3) are connected to each other to form an inner ring structure; the inner ring structure is fitted onto the outer ring (1); The axial center axis of the main push roller (4) and the axial center axis of the auxiliary push roller (5) are set at an angle greater than 90° and less than 180°; and the diameter of the main push roller (4) is greater than the diameter of the auxiliary push roller (5), and the axial length of the main push roller (4) is greater than the axial length of the auxiliary push roller (5).

2. The asymmetric double-row cylindrical roller bearing of claim 1, wherein, The outer ring (1) includes an outer ring body (1.1) and a first main push contact surface (1.2) and a first auxiliary push contact surface (1.3) disposed on the outer ring body (1.1). The first main push contact surface (1.2) is used to make contact with the main push roller (4), the first auxiliary push contact surface (1.3) is used to make contact with the auxiliary push roller (5), and the angle between the first main push contact surface (1.2) and the radial center axis (A) of the outer ring body is greater than the angle between the first auxiliary push contact surface (1.3) and the radial center axis (A) of the outer ring body.

3. The asymmetric double-row cylindrical roller bearing of claim 2, wherein, A second main push contact surface is provided on the first inner ring (2) for contact connection with the main push roller (4). The second main push contact surface and the first main push contact surface (1.2) are arranged parallel to each other and cooperate with each other to form the main push raceway for installing the main push roller (4). The second inner ring (3) is provided with a second auxiliary push contact surface for contacting the auxiliary push roller (5). The second auxiliary push contact surface and the first auxiliary push contact surface (1.3) are arranged parallel to each other and cooperate with each other to form an auxiliary push track for installing the auxiliary push roller (5).

4. The asymmetric double-row cylindrical roller bearing according to any one of claims 1-3, characterized in that, The first inner ring (2) and the second inner ring (3) are both set in a block manner. The adjacent two blocks are connected by bolts, and the adjacent two blocks are positioned by a stepped stop structure.

5. The asymmetric double-row cylindrical roller bearing of claim 4, wherein, The axial length of the first inner ring (2) is set to 1.5-2 times the axial length of the second inner ring (3).

6. The asymmetric double-row cylindrical roller bearing of claim 5, wherein, It also includes the main thrust cage and the auxiliary thrust cage; Several main push rollers (4) are provided on the main push cage at intervals. Several auxiliary push rollers (5) are provided on the auxiliary push retainer at intervals.

7. A heading machine characterized by Includes the asymmetric double-row cylindrical roller bearing as described in any one of claims 1-6; When the tunneling machine is used for tunneling in soft soil, the diameter of the main thrust roller (4) is set to 1.3-1.5 times the diameter of the auxiliary thrust roller (5), the axial length of the main thrust roller (4) is set to 1.5-2 times the axial length of the auxiliary thrust roller (5), and the included angle between the main thrust roller (4) and the radial center axis (A) of the outer ring body is greater than the included angle between the auxiliary thrust roller (5) and the radial center axis (A) of the outer ring body by 40°-60°.

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