Gear type step roller cone bearing

Abstract

The utility model relates to the technical field of bearing applied to shield machine, concretely is a gear type different diameter roller conic bearing, and the outer diameter circumference direction of outer ring gear is provided with the burl, and the inner diameter of outer ring gear is provided with first outer ring raceway and second outer ring raceway respectively, inner ring subassembly includes the first inner ring of outer diameter setting first inner ring raceway and the second inner ring of outer diameter setting second inner ring raceway, a first conical roller is arranged between first outer ring raceway and first inner ring raceway, a second conical roller is arranged between second outer ring raceway and second inner ring raceway, and the length of first conical roller is less than the length of second conical roller, the utility model integrates the bearing outer ring and the gear ring into one, can avoid the error that gear ring and bearing assembly bring, improves product precision.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology applied to tunnel boring machines, specifically a gear-type tapered roller bearing with different diameters. Background Technology

[0002] With the continuous progress of the times, in recent years, the demand for urban underground railways, underground tunnels and pipelines, basic engineering, underground commercial and industrial spaces, underground storage facilities and other projects has been increasing. These construction projects usually require the use of tunnel boring machines.

[0003] A tunnel boring machine (TBM) is a type of tunnel boring machine that uses the shield tunneling method. The shield tunneling method involves the TBM simultaneously excavating and laying the "shield" of the tunnel. During the manufacturing process of a TBM, double-row tapered roller bearings are required. A gear ring is assembled onto the outer ring of the double-row tapered roller bearing, and the gear ring connects to other structures. Inevitably, assembly errors will occur during the assembly of the gear ring and bearing, reducing the overall precision of the bearing and gear ring structure, and consequently affecting the reliability of the TBM. Utility Model Content

[0004] In view of the deficiencies of the prior art, this utility model provides a gear-type tapered roller bearing with different diameters, which integrates the outer ring of the bearing and the gear ring into one piece, thereby avoiding the errors caused by the assembly of the gear ring and the bearing and improving the product precision.

[0005] To achieve the above objectives, the present invention provides a gear-type tapered roller bearing with different diameters, comprising an outer gear ring, an inner ring assembly, a row of first tapered rollers, and a row of second tapered rollers. The outer gear ring has protruding teeth along its outer circumferential direction, and its inner diameter is provided with a first outer ring raceway and a second outer ring raceway. The inner ring assembly includes a first inner ring with a first inner ring raceway on its outer diameter and a second inner ring with a second inner ring raceway on its outer diameter. A row of first tapered rollers is disposed between the first outer ring raceway and the first inner ring raceway; a row of second tapered rollers is disposed between the second outer ring raceway and the second inner ring raceway; the length of the first tapered rollers is less than the length of the second tapered rollers.

[0006] Furthermore, the angle between the axis of the first tapered roller and the axis of the second tapered roller is less than 90 degrees.

[0007] Furthermore, a bolt countersunk hole is provided on the end face of the external gear ring near the first tapered roller.

[0008] Furthermore, the outer gear ring has an outer gear ring protrusion on the end face near the first tapered roller, and there is a gap between the outer gear ring protrusion and the outer diameter of the first inner ring.

[0009] Furthermore, the first inner ring has a first connecting hole extending through both end faces, and the second inner ring has a second connecting hole extending through both end faces.

[0010] Furthermore, a convex ring is provided on one end face of the first inner ring near the inner diameter, and a concave ring is provided on one end face of the second inner ring near the inner diameter. The convex ring and the concave ring cooperate with each other, and the first connecting hole and the second connecting hole are coaxially connected.

[0011] Furthermore, a first large end flange and a first small end flange are respectively provided on both sides of the first inner ring raceway of the first inner ring.

[0012] Furthermore, a second large end flange and a second small end flange are respectively provided on both sides of the second inner ring raceway of the second inner ring.

[0013] The beneficial effects of this utility model are as follows: The external gear ring integrates the bearing outer ring and the gear ring into one piece, which can avoid the errors caused by the assembly of the gear ring and the bearing, improve the product accuracy. In addition, the structure is relatively compact, which is conducive to reducing the size of the tunnel boring machine and reducing the manufacturing cost. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a gear-type tapered roller bearing with different diameters in one embodiment of the present invention; In the picture: 100. External gear ring; 110. Raised tooth; 120. First outer ring raceway; 130. Second outer ring raceway; 140. Bolt countersunk hole; 150. External gear ring protrusion. 200. Inner ring assembly; 210. First inner ring; 211. First inner ring raceway; 212. First connecting hole; 213. Protruding ring; 214. First large end retaining flange; 215. First small end retaining flange; 220. Second inner ring; 221. Second inner ring raceway; 222. Second connecting hole; 223. Concave ring; 224. Second large end retaining flange; 225. Second small end retaining flange. 300. First tapered roller, 400. Second tapered roller. Detailed Implementation

[0015] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0016] See Figure 1 The diagram shows a schematic of a gear-type tapered roller bearing with different diameters according to an embodiment of the present invention, which is applied to a tunnel boring machine. It includes an outer gear ring 100, an inner ring assembly 200, a first row of tapered rollers 300 and a second row of tapered rollers 400. The outer gear ring 100 is fixed on the shield body and driven to rotate by a drive reducer. The inner ring assembly 200 is connected to the cutterhead of the tunnel boring machine. The outer gear ring 100 has protruding teeth 110 in the circumferential direction of its outer diameter, and the inner diameter of the outer gear ring 100 is provided with a first outer ring raceway 120 and a second outer ring raceway 130 respectively; the inner ring assembly 200 includes a first inner ring 210 with a first inner ring raceway 211 in its outer diameter and a second inner ring 220 with a second inner ring raceway 221 in its outer diameter; a row of first tapered rollers 300 is disposed between the first outer ring raceway 120 and the first inner ring raceway 211; a row of second tapered rollers 400 is disposed between the second outer ring raceway 130 and the second inner ring raceway 221; the length of the first tapered rollers 300 is less than the length of the second tapered rollers 400.

[0017] The aforementioned gear-type tapered roller bearing features an external gear ring 100, which integrates the bearing outer ring and the gear ring into one unit. This avoids errors caused by assembly issues between the gear ring and the bearing, improving product precision. With the outer gear ring 100 featuring protruding teeth 110, no other additional gear rings are required, resulting in a more compact structure. This is beneficial for reducing the size of the tunnel boring machine (TBM) and lowering manufacturing costs. Furthermore, the length of the first tapered roller 300 is shorter than that of the second tapered roller 400, employing a unequal diameter rolling element design to address axial load issues, increasing axial load capacity by over 30% compared to bearings of similar size. Specifically, in applications where the loads on both sides of the aforementioned gear-type tapered roller bearing differ, and since the TBM can only move forward, the axial load is unidirectional. The unequal diameter rollers and raceway contact angle greater than 45 degrees are designed and developed based on the working conditions, significantly improving the bearing's axial load capacity.

[0018] Preferably, the length of the first tapered roller 300 is L1, and the length of the second tapered roller 400 is L2, then the roller lengths satisfy: L2≥2◊L1.

[0019] Further, in one embodiment, the angle between the axis of the first tapered roller 300 and the axis of the second tapered roller 400 is less than 90 degrees. Preferably, the angle between the axis of the first tapered roller 300 and the axis of the second tapered roller 400 is between 70 degrees and 85 degrees.

[0020] In one embodiment, a countersunk hole 140 for bolts is provided on the end face of the external gear ring 100 near the first tapered roller 300. The threaded hole of the external gear ring 100 adopts a design combining countersunk hole and threaded hole, which solves the technical bottleneck of thread processing of carburized steel.

[0021] In one embodiment, an external gear ring 100 has an external gear ring protrusion 150 on its end face near the first tapered roller 300, and there is a gap between the external gear ring protrusion 150 and the outer diameter of the first inner ring 210. In this embodiment, providing the external gear ring protrusion 150 can reduce the distance between the inner diameter of the external gear ring 100 and the outer diameter of the first inner ring 210, which can prevent large impurities from entering the bearing and affecting the operation of the bearing, thereby extending the service life of the bearing.

[0022] In one embodiment, the first inner ring 210 has a first connecting hole 212 extending through both end faces, and the second inner ring 220 has a second connecting hole 222 extending through both end faces.

[0023] In one embodiment, a convex ring 213 is provided on one end face of the first inner ring 210 near the inner diameter, and a concave ring 223 is provided on one end face of the second inner ring 220 near the inner diameter. The convex ring 213 and the concave ring 223 cooperate with each other, and the first connecting hole 212 and the second connecting hole 222 are coaxially connected.

[0024] In one embodiment, a first large end flange 214 and a first small end flange 215 are respectively provided on both sides of the first inner ring raceway 211 of the first inner ring 210. The first large end flange 214 and the first small end flange 215 respectively limit the two end faces of the first tapered roller 300, so as to make the operation of the bearing more stable.

[0025] In one embodiment, a second large end flange 224 and a second small end flange 225 are respectively provided on both sides of the second inner ring raceway 221 of the second inner ring 220. The second large end flange 224 and the second small end flange 225 respectively limit the two end faces of the second tapered roller 400, so as to make the operation of the bearing more stable.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A gear-type tapered roller bearing with varying diameters, characterized in that: include The outer gear ring has protruding teeth in the circumferential direction of its outer diameter, and the inner diameter of the outer gear ring is respectively provided with a first outer ring raceway and a second outer ring raceway. The inner ring assembly includes a first inner ring with a first inner ring raceway on its outer diameter and a second inner ring with a second inner ring raceway on its outer diameter; A first row of tapered rollers is disposed between the first outer raceway and the first inner raceway; A second row of tapered rollers is disposed between the second outer ring raceway and the second inner ring raceway; The length of the first tapered roller is less than the length of the second tapered roller.

2. The gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The angle between the axis of the first tapered roller and the axis of the second tapered roller is less than 90 degrees.

3. A gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The outer gear ring has a bolt countersunk hole on its end face near the first tapered roller.

4. A gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The outer gear ring has an outer gear ring protrusion on its end face near the first tapered roller, and there is a gap between the outer gear ring protrusion and the outer diameter of the first inner ring.

5. A gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The first inner ring has a first connecting hole through both end faces, and the second inner ring has a second connecting hole through both end faces.

6. A gear-type tapered roller bearing with different diameters according to claim 5, characterized in that: A convex ring is provided on one end face of the first inner ring near the inner diameter, and a concave ring is provided on one end face of the second inner ring near the inner diameter. The convex ring and the concave ring cooperate with each other, and the first connecting hole and the second connecting hole are coaxially connected.

7. A gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The first inner ring raceway of the first inner ring is provided with a first large end guard and a first small end guard on both sides.

8. A gear-type tapered roller bearing with different diameters according to claim 1, characterized in that: The second inner ring raceway is provided with a second large end flange and a second small end flange on both sides.

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