A tapered roller bearing

Abstract

The utility model relates to bearing technical field, concretely is a kind of tapered roller bearing, outer ring is equipped with outer ring big end face and outer ring small end face;Cage is equipped with cage big end, cage small end and the plurality of beam column being set between cage big end and cage small end, the outer diameter size of cage big end is greater than the inner diameter size of outer ring small end face;Inner ring is equipped with inner ring big end face and inner ring small end face, the outer diameter of inner ring close to inner ring big end face is provided with big baffle, the outer diameter surface of inner ring is smoothly transitioned from the outer diameter edge of inner ring small end face to big baffle.The utility model is provided with big baffle to the outer diameter of inner ring close to inner ring big end face, the outer diameter surface of inner ring is smoothly transitioned from the outer diameter edge of inner ring small end face to big baffle, remove the small baffle of tapered roller bearing inner ring, can give out greater space to the inner ring outer diameter side of inner ring, and then can increase the design size of rolling body, improve bearing carrying capacity.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically a tapered roller bearing. Background Technology

[0002] Currently, tapered roller bearings have large and small flanges on the inner ring. The large flange primarily bears the load, while the small flange mainly secures the rolling elements and cage. However, tapered roller bearings with stamped cages are limited by the height of the small flange, requiring expansion followed by contraction, which tests the machining process and makes it difficult to guarantee the cage contraction accuracy. The bearing's load-carrying capacity mainly depends on the size and number of rolling elements; the presence of the small flange on the inner ring restricts the size of the rolling elements.

[0003] To improve load-bearing capacity, existing tapered roller bearing designs employ two approaches: one is to increase the number of rolling elements, but this reduces the strength of the cage; the other is to reduce the thickness of the large and small flanges of the inner ring to a certain extent, increasing the design space for the rolling elements, which also reduces the load-bearing capacity of the large flange of the inner ring. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a tapered roller bearing that eliminates the small flange on the inner ring of the bearing, transfers the function of fixing the rolling elements and the cage to the small end face of the outer ring, increases the design space of the rolling elements, increases the design size of the rolling elements, and achieves the effect of increasing the bearing load capacity.

[0005] To achieve the above objectives, the present invention provides a tapered roller bearing, comprising an outer ring, an inner ring, a cage, and rolling elements disposed between the outer ring and the inner ring. The outer ring has a large end face and a small end face; the cage has a large end face, a small end face, and a plurality of beams and columns disposed between the large end face and the small end face, wherein the outer diameter of the large end face is larger than the inner diameter of the small end face; the inner ring has a large end face and a small end face, and a large flange is provided on the outer diameter of the inner ring near the large end face, wherein the outer diameter surface of the inner ring smoothly transitions from the outer diameter edge of the small end face to the large flange.

[0006] Furthermore, the outer diameter of the large end of the cage is smaller than the outer diameter of the small end face of the outer ring.

[0007] Furthermore, the inner diameter of the outer ring is provided with an outer ring raceway, and the distance between the large end face of the outer ring and the small end face of the rolling element along the direction of the outer ring raceway is greater than or equal to 1 mm.

[0008] Furthermore, the outer diameter of the inner ring is provided with an inner ring raceway, and the distance between the small end face of the inner ring and the small end of the rolling element along the inner ring raceway direction is greater than or equal to 1 mm.

[0009] Furthermore, the length of the rolling element is less than the length of the inner raceway.

[0010] Furthermore, the outer diameter of the large end of the cage is D2, and the inner diameter of the small end face of the outer ring is D1. Then D2 = D1 + 1.5ε, where ε is the maximum radial runout value of the cage.

[0011] Furthermore, a first fillet is provided between the large end face of the outer ring and the outer ring raceway.

[0012] Furthermore, there is an axial gap between the large end of the cage and the small end face of the outer ring.

[0013] Furthermore, the gap is 0.1 mm.

[0014] The beneficial effects of this utility model are as follows: A large flange is provided on the outer diameter of the inner ring near the large end face of the inner ring. The outer diameter surface of the inner ring smoothly transitions from the outer diameter edge of the small end face of the inner ring to the large flange. Removing the small flange of the inner ring of the tapered roller bearing can provide more space on one side of the outer diameter of the inner ring, thereby increasing the design size of the rolling elements and improving the bearing load capacity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a tapered roller bearing in one embodiment of the present invention; Figure 2 This is a dimensional schematic diagram of a tapered roller bearing according to one embodiment of the present invention; Figure 3 This is a schematic diagram of the inner ring structure of a tapered roller bearing according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the cage structure of a tapered roller bearing according to one embodiment of the present invention; Figure 5 This is a three-dimensional schematic diagram of a tapered roller bearing according to one embodiment of the present invention; Figure 6 This is a three-dimensional schematic diagram of a tapered roller bearing from another angle in one embodiment of the present invention; In the picture: 100. Outer ring; 110. Large end face of outer ring; 120. Small end face of outer ring; 130. Outer ring raceway; 140. First fillet. 200. Inner ring; 210. Large end face of inner ring; 220. Small end face of inner ring; 230. Outer diameter of inner ring; 231. Large flange; 240. Inner ring raceway. 300. Cage; 310. Large end of cage; 320. Small end of cage; 330. Beam / column. 400, rolling element; 410, small end of rolling element. Detailed Implementation

[0016] 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.

[0017] See Figures 1-4 The diagram shows a structural schematic of a tapered roller bearing according to an embodiment of the present invention, including an outer ring 100, an inner ring 200, a cage 300 disposed between the outer ring 100 and the inner ring 200, and rolling elements 400. The outer ring 100 has a large end face 110 and a small end face 120. The cage 300 has a large end 310, a small end 320, and multiple beams disposed between the large end 310 and the small end 320. The outer diameter of the large end 310 of the column 330 is larger than the inner diameter of the small end face 120 of the outer ring, and the outer diameter of the large end 310 of the cage is smaller than the outer diameter of the small end face 120 of the outer ring. The inner ring 200 is provided with an inner ring large end face 210 and an inner ring small end face 220. The outer diameter 230 of the inner ring near the inner ring large end face 210 is provided with a large flange 231. The outer diameter surface of the inner ring 200 smoothly transitions from the outer diameter edge of the inner ring small end face 220 to the large flange 231.

[0018] The aforementioned tapered roller bearing has a large flange 231 on the outer diameter 230 of the inner ring near the large end face 210 of the inner ring. The outer diameter surface of the inner ring 200 smoothly transitions from the outer diameter edge of the small end face 220 of the inner ring to the large flange 231. Removing the small flange of the inner ring 200 of the tapered roller bearing allows for more space on one side of the outer diameter 230 of the inner ring 200, thereby increasing the design size of the rolling element 400 and improving the bearing's load-bearing capacity. The function of the small flange of the inner ring in the existing tapered roller bearing for fixing the rolling element 400 and the cage 300 is transferred to the small end face 120 of the outer ring. Increasing the size of the end face of the large end 310 of the cage makes the outer diameter of the large end 310 of the cage larger than the inner diameter of the small end face 120 of the outer ring, thus achieving the effect that the radial height of the end face of the large end 310 of the cage is higher than the minimum size of the small end face 120 of the outer ring of the bearing, thereby fixing the position of the rolling element 400 and the cage 300.

[0019] In one embodiment, the inner diameter of the outer ring 100 is provided with an outer ring raceway 130, and the distance between the large end face 110 of the outer ring and the small end 410 of the rolling element along the direction of the outer ring raceway 130 is greater than or equal to 1 mm.

[0020] In one embodiment, the outer diameter of the inner ring 200 is provided with an inner ring raceway 240, and the distance between the small end face 220 of the inner ring and the small end 410 of the rolling element along the direction of the inner ring raceway 240 is greater than or equal to 1 mm.

[0021] In one embodiment, the outer diameter of the cage large end 310 is D2, and the inner diameter of the outer ring small end face 120 is D1. Then, D2 = D1 + 1.5ε, where ε is the maximum radial runout value of the cage. Specifically, the cage large end 310 extends outward from the bearing, and conversely, the cage small end 320 extends inward from the bearing.

[0022] In one embodiment, a first fillet 140 is provided between the outer ring large end face 110 and the outer ring raceway 130.

[0023] In one embodiment, there is an axial gap between the large end 310 of the cage and the small end face 120 of the outer ring.

[0024] In one embodiment, the gap is 0.1 mm.

[0025] See Figure 2 Taking ZWZ bearing 32230 (32000 series) as an example, the overall optimization method is as follows: Step S100: Determine the design parameters of conventional bearings according to the tapered bearing design method.

[0026] Step S200: After removing the inner ring small flange, redesign the rolling element dimensions. The original bearing inner ring raceway length was 56mm. After removing the inner ring small flange, the inner ring raceway 240 length is 62mm, meaning the rolling element 400 length must be less than 62mm. Considering the maximum chamfer of the outer ring large end face 110's outer inner diameter, the minimum distance from the outer ring large end face 110's outer inner diameter to the rolling element small end 410 along the outer raceway should be greater than or equal to 1mm and less than or equal to 3mm, i.e., 3mm ≥ a ≥ 1mm. Considering the maximum chamfer of the inner ring small end's inner and outer diameters, the minimum distance from the inner ring small end's inner and outer diameters to the rolling element's small section along the inner raceway should be greater than or equal to 1mm, i.e., b ≥ 1mm. After considering the above, simultaneously satisfying 3mm ≥ a ≥ 1mm and b ≥ 1mm, the maximum rolling element length is 59.2mm.

[0027] Step S300: After removing the inner ring small flange, redesign the cage dimensions. Based on the bearing optimization approach, the function of fixing the cage 300 and rolling elements 400 is transferred from the inner ring small flange to the outer ring small end face 120. That is, the outer diameter of the cage large end 310 and the outer inner diameter of the outer ring small end face 120 are interference-fitted in radial height, i.e., D2 > D1. At this point, D1 is the maximum size after removing the largest chamfer on the outer inner diameter of the outer ring. Considering the radial runout ε of the cage, D2 > D1. Considering a safety margin, D2 = D1 + 1.5ε. Calculations show that the maximum radial runout of this bearing cage is ε = 1.7 mm, and D1 = 127.8 mm. Therefore, D2 = D1 + 1.5ε = 130.4 (rounded to one decimal place). S is the cage plate thickness. Considering machining errors and assembly, the theoretically designed distance c between the cage and the outer ring small end face is 0.1.

[0028] Table 1 shows the parameter changes after bearing optimization.

[0029] As shown in Table 1, the optimized bearing has a 3.3% increase in dynamic load and a 4.3% increase in static load compared to the original bearing, while the overall weight remains basically unchanged.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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 tapered roller bearing, comprising an outer ring, an inner ring, a cage and rolling elements disposed between the outer ring and the inner ring, characterized in that: The outer ring has a large end face and a small end face; the cage has a large end face, a small end face, and multiple beams and columns disposed between the large end face and the small end face, the outer diameter of the large end face is larger than the inner diameter of the small end face; the inner ring has a large end face and a small end face, a large flange is provided on the outer diameter of the inner ring near the large end face, and the outer diameter surface of the inner ring smoothly transitions from the outer diameter edge of the small end face to the large flange.

2. A tapered roller bearing according to claim 1, characterized in that: The outer diameter of the large end of the cage is smaller than the outer diameter of the small end face of the outer ring.

3. A tapered roller bearing according to claim 1, characterized in that: The inner diameter of the outer ring is provided with an outer ring raceway, and the distance between the large end face of the outer ring and the small end of the rolling element along the direction of the outer ring raceway is greater than or equal to 1 mm.

4. A tapered roller bearing according to claim 1, characterized in that: The outer diameter of the inner ring is provided with an inner ring raceway, and the distance between the small end face of the inner ring and the small end of the rolling element along the inner ring raceway direction is greater than or equal to 1 mm.

5. A tapered roller bearing according to claim 4, characterized in that: The length of the rolling element is less than the length of the inner raceway.

6. A tapered roller bearing according to any one of claims 1-4, characterized in that: The outer diameter of the large end of the cage is D2, and the inner diameter of the small end face of the outer ring is D1. Then D2 = D1 + 1.5ε, where ε is the maximum radial runout value of the cage.

7. A tapered roller bearing according to any one of claims 1-4, characterized in that: A first fillet is provided between the large end face of the outer ring and the outer ring raceway.

8. A tapered roller bearing according to any one of claims 1-4, characterized in that: There is an axial gap between the large end of the cage and the small end face of the outer ring.

9. A tapered roller bearing according to claim 8, characterized in that: The gap is 0.1 mm.

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