Bearing unit and transmission system

Abstract

The utility model provides a bearing unit and a transmission system. The bearing unit comprises a bearing inner ring, a bearing outer ring, a plurality of first drum-shaped rollers, a plurality of spherical rollers and a plurality of second drum-shaped rollers, a first roller path, a second roller path and a third roller path which are sequentially arranged at intervals in the axial direction are formed between the bearing inner ring and the bearing outer ring. The plurality of first drum-shaped rollers are mounted in the first raceway, the plurality of spherical rollers are mounted in the second raceway, the plurality of second drum-shaped rollers are mounted in the third raceway, and the first drum-shaped rollers, the spherical rollers and the second drum-shaped rollers are arranged in the peripheral direction of the bearing inner ring. The bearing unit provided by the utility model can provide a reliable supporting structure, and meanwhile, the spherical roller and the drum-shaped roller are in rolling motion in point-surface contact with the raceway surface, so that the contact area can be effectively reduced, the frictional resistance of the bearing unit is reduced, and the operation efficiency of the bearing is improved.

Description

Technical Field

[0001] This utility model relates to the field of bearing design technology, specifically to a bearing unit and transmission system. Background Technology

[0002] Currently, bearing units are widely used in various mechanical equipment and industrial fields, providing reliable support and protection for equipment operation. They are particularly prevalent in the commercial vehicle sector, showing a trend of completely replacing traditional tapered roller bearings. The working principle of bearing units is based on reducing rolling friction, enabling rotating machinery to operate more efficiently and smoothly. Existing conventional bearing units are all composed of double-row tapered roller bearings. However, because the rolling elements and raceways of double-row tapered roller bearings have a line-to-surface contact, there are limitations to improving the bearing's low-friction performance, leaving room for further improvement. Utility Model Content

[0003] In view of the problems existing in the prior art, the present invention provides a bearing unit and transmission system to improve the technical problem that the existing double-row tapered roller bearings have limitations in improving the low friction performance of the bearing.

[0004] To achieve the above and other related objectives, the first aspect of this utility model provides a bearing unit comprising an inner bearing ring, an outer bearing ring, a plurality of first drum-shaped rollers, a plurality of spherical rollers, and a plurality of second drum-shaped rollers. The inner bearing ring and the outer bearing ring are coaxially arranged, and the outer bearing ring is fitted over the inner bearing ring. A first raceway, a second raceway, and a third raceway are formed between the inner bearing ring and the outer bearing ring, and the first raceway, the second raceway, and the third raceway are sequentially spaced along the axial direction. The plurality of first drum-shaped rollers are mounted in the first raceway and arranged along the outer circumference of the inner bearing ring. The plurality of spherical rollers are mounted in the second raceway and arranged along the outer circumference of the inner bearing ring. The plurality of second drum-shaped rollers are mounted in the third raceway and arranged along the outer circumference of the inner bearing ring.

[0005] In one embodiment of the bearing unit of this utility model, the bearing inner ring includes a first inner ring and a second inner ring; the first inner ring and the second inner ring are disposed opposite to each other, and the inward ends of the first inner ring and the second inner ring abut against each other.

[0006] In one embodiment of the bearing unit of this utility model, the second raceway includes a second inner raceway, which is located at the junction of the outer ring of the first inner ring and the outer ring of the second inner ring.

[0007] In one embodiment of the bearing unit of this utility model, the bearing unit further includes an inner ring connector, which is snapped into the inner cavity of the first inner ring and the second inner ring.

[0008] In one embodiment of the bearing unit of this utility model, the bearing unit further includes a retainer disposed on the outside of the plurality of spherical rollers.

[0009] In one embodiment of the bearing unit of this utility model, a plurality of first drum-shaped rollers are fully installed in the first raceway, and a plurality of second drum-shaped rollers are fully installed in the third raceway.

[0010] In one embodiment of the bearing unit of this utility model, the axis of the first drum-shaped roller intersects with the axis of the inner ring of the bearing, and the first drum-shaped roller is inclined along the outer side of the outer ring of the bearing to the abutment of the first inner ring and the second inner ring.

[0011] In one embodiment of the bearing unit of this utility model, the acute angle between the axis of the first drum-shaped roller and the axis of the inner ring of the bearing is α, where 40°≤α≤50°.

[0012] In one embodiment of the bearing unit of this utility model, the second drum-shaped roller and the first drum-shaped roller are symmetrically arranged on both sides of the spherical roller.

[0013] A second aspect of this utility model also provides a transmission system, which includes the bearing unit described in any of the above claims.

[0014] In the bearing unit and transmission system of this invention, multiple raceways are provided between the outer and inner rings of the bearing. The rolling element structure, consisting of two sets of drum-shaped rollers and one set of spherical rollers, provides a reliable support structure. Furthermore, the rolling motion between the spherical and drum-shaped rollers and the raceway surfaces involves point-to-surface contact, which, compared to line-to-surface contact, effectively reduces the contact area, lowers the frictional resistance of the bearing unit, and improves the bearing's operating efficiency. Simultaneously, point-to-surface contact reduces wear while improving lubrication, lowering bearing maintenance costs and enhancing the operational reliability of the equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic cross-sectional view of one embodiment of the bearing unit of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of another embodiment of the bearing unit of this utility model;

[0018] Figure 3 This is a schematic diagram showing the angle of the drum-shaped roller and the position of the contact point in one embodiment of the bearing unit of this utility model;

[0019] Figure 4 This is a schematic diagram of the inner ring connector structure in one embodiment of the bearing unit of this utility model;

[0020] Figure 5 for Figure 4 A schematic diagram of the AA-direction structure.

[0021] Component designation explanation:

[0022] 100, Bearing inner ring; 110, First inner ring; 120, Second inner ring; 200, Bearing outer ring; 301, First raceway; 3011, First inner raceway; 3012, First outer raceway; 302, Second raceway; 3021, Second inner raceway; 303, Third raceway; 3031, Third inner raceway; 3032, Third outer raceway; 310, First drum-shaped roller; 320, Spherical roller; 330, Second drum-shaped roller; 400, Inner ring connector; 500, Retainer. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0024] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0025] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0026] To address the limitation of existing double-row tapered roller bearings in improving low-friction performance, this invention provides a bearing unit and transmission system. This bearing unit effectively reduces contact area, lowers frictional resistance, improves bearing operating efficiency, and enhances equipment reliability.

[0027] Please see Figures 1 to 5 The first aspect of this utility model provides a bearing unit, which includes an inner bearing ring 100, an outer bearing ring 200, a plurality of first drum-shaped rollers 310, a plurality of spherical rollers 320, and a plurality of second drum-shaped rollers 330. The inner bearing ring 100 has a shaft hole adapted to a drive shaft. The inner bearing ring 100 and the outer bearing ring 200 are coaxially arranged, with the outer bearing ring 200 fitted over the inner bearing ring 100, and a gap exists between them to serve as rolling space for the rolling elements 300. A first raceway 301, a second raceway 302, and a third raceway 303 are formed between the inner bearing ring 100 and the outer bearing ring 200. The first raceway 301 and the third raceway 303 are self-aligning roller raceways, and the interface of the raceway surface is arc-shaped. The first raceway 301 is used to mount the first drum-shaped rollers 310, and the third raceway 303 is used to mount the second drum-shaped rollers 330. The first raceway 301, the second raceway 302, and the third raceway 303 are arranged sequentially at intervals along the axial direction of the bearing unit. The first raceway 301 and the third raceway 303 are symmetrically arranged on both sides of the second raceway 302.

[0028] Multiple first drum-shaped rollers 310 are mounted in the first raceway 301 and arranged along the outer circumference of the bearing inner ring 100, i.e., circumferentially. The arrangement of the first drum-shaped rollers 310 is not limited; they can be fully packed in the first raceway 301 or spaced apart by a cage. Multiple spherical rollers 320 are mounted in the second raceway 302 and arranged along the outer circumference of the bearing inner ring 100. Multiple second drum-shaped rollers 330 are mounted in the third raceway 303 and arranged along the outer circumference of the bearing inner ring 100.

[0029] In this embodiment, a single first drum-shaped roller 310 has two contact points with the raceway surface of the first raceway 301, namely, one contact point with each of the first inner raceway 3011 and the first outer raceway 3012 of the first raceway 301. The first inner raceway 3011 is on the outer circumferential surface of the bearing inner ring 100, and the first outer raceway 3012 is on the inner circumferential surface of the bearing outer ring 200. Similarly, the second drum-shaped roller 330 has two contact points with the raceway surface of the third raceway 303, namely, the second drum-shaped roller 330 has one contact point with each of the third inner raceway 3031 and the third outer raceway 3032 of the third raceway 303. The third inner raceway 3031 is on the outer circumferential surface of the bearing inner ring 100, and the third outer raceway 3032 is on the inner circumferential surface of the bearing outer ring 200. There are four contact points between a single spherical roller 320 and the second raceway 302: two contact points between the spherical roller 320 and the second inner raceway 3021 (located on the outer circumferential surface of the inner ring 100), and two contact points between the spherical roller 320 and the second outer raceway 3022 (located on the inner circumferential surface of the outer ring 200). This invention's bearing unit employs eight-point linear contact between the rolling elements and raceways, enabling self-aligning capability while meeting axial and radial load requirements. This reduces rotational frictional resistance and improves bearing operating efficiency.

[0030] Please see Figure 1 and Figure 2 In one embodiment of the bearing unit of this utility model, to facilitate the installation of the rolling elements, the bearing inner ring 100 adopts a split structure, comprising a first inner ring 110 and a second inner ring 120; wherein the first inner ring 110 and the second inner ring 120 are arranged opposite to each other, with their inwardly facing ends abutting against each other; a first inner raceway 3011 is formed on the outer circumferential surface of the first inner ring 110, and a third inner raceway 3031 is formed on the outer circumferential surface of the second inner ring 120. Further, in this embodiment, the second raceway 302 includes a second inner raceway 3021, which is located at the abutment point between the outer rings of the first inner ring 110 and the second inner ring 120. That is, the raceway surface of the second inner raceway 3021 is formed by splicing the first inner ring 110 and the second inner ring 120, facilitating the installation of the rolling elements. Simultaneously, the split structure of the bearing inner ring 100 can adapt to different installation environments and working conditions, providing greater installation flexibility.

[0031] In one embodiment of the bearing unit of this utility model, in order to prevent the inner ring 100 of the split bearing structure from separating and falling off, and to ensure the smooth progress of the assembly or transportation process, the bearing unit also includes an inner ring connector 400. The inner ring connector 400 is a locking member connecting the first inner ring 110 and the second inner ring 120, preventing the first inner ring 110 and the second inner ring 120 from separating. The inner ring connector 400 can be a bushing, fitted into the shaft holes of the first inner ring 110 and the second inner ring 120. The inner ring connector 400 can also be a bearing unit retaining ring (i.e., a snap ring), which is snapped into the abutment point inside the shaft holes of the first inner ring 110 and the second inner ring 120. For details, please refer to [link to specific details]. Figure 4 and Figure 5 In this embodiment, the inner ring connector 400 adopts a bearing unit retaining ring.

[0032] In one embodiment of the bearing unit of this utility model, the bearing unit further includes a retainer 500, which is disposed on the outside of the plurality of spherical rollers 320 and located between the first raceway 301 and the third raceway 303. The retainer 500 maintains the spacing between the spherical rollers 320 and prevents friction and wear.

[0033] In one embodiment of the bearing unit of this utility model, a plurality of first drum-shaped rollers 310 are fully installed on the first raceway 301, and a plurality of second drum-shaped rollers 330 are fully installed on the third raceway 303. The full installation of the first drum-shaped rollers 310 and the second drum-shaped rollers 330 enables the bearing unit to withstand a larger load, improves the overall load-bearing capacity of the bearing unit, optimizes the transmission efficiency, and eliminates the need for a cage to install the drum-shaped rollers again, reducing assembly complexity.

[0034] Please see Figures 1 to 3In one embodiment of the bearing unit of this utility model, the axis of the first drum-shaped roller 310 intersects the axis of the inner ring 100 of the bearing. The first drum-shaped roller 310 is inclined along the outer edge of the outer ring 200 of the bearing to the abutment of the first inner ring 110 and the second inner ring 120. That is, taking the two ends of the first drum-shaped roller 310 as an example, the end of the first drum-shaped roller 310 facing outward relative to the axial direction of the bearing unit is the outer end of the first drum-shaped roller 310, and the end of the first drum-shaped roller 310 facing inward relative to the axial direction of the bearing unit is the inner end of the first drum-shaped roller 310. Along the radial direction opposite to the axial direction, the outer end of the first drum-shaped roller 310 is inclined from the outer periphery of the bearing unit towards the inner center position. That is, a flared structure that is wider on the outside and narrower on the inside is formed. Specifically, in this embodiment, the acute angle between the axis of the first drum-shaped roller 310 and the axis of the bearing inner ring 100 is α, where 40°≤α≤50°. Furthermore, in this embodiment, the second drum-shaped roller 330 and the first drum-shaped roller 310 are mirror-symmetrical structures, symmetrically arranged on both sides of the spherical roller 320. In the above structural design, the inclined arrangement and tilt angle of the first drum-shaped roller 310 and the second drum-shaped roller 330 are designed to withstand axial loads, while eliminating the need for additional flange structures on the bearing inner ring 100 and bearing outer ring 200, thus reducing the overall design complexity.

[0035] The second aspect of this utility model also provides a transmission system, which includes the bearing unit described in any of the above claims. It should be noted that the transmission system can be used in mechanical equipment and transportation vehicles such as automobiles, construction machinery, agricultural machinery, industrial equipment, household appliances, aerospace equipment, and medical equipment, but is not limited thereto.

[0036] In the bearing unit and transmission system of this utility model, multiple raceways are arranged between the outer ring and the inner ring of the bearing. The rolling element structure, composed of two sets of drum-shaped rollers and one set of spherical rollers, provides a reliable support structure. Simultaneously, the rolling motion between the spherical and drum-shaped rollers and the raceway surfaces involves point-to-surface contact. Compared to line-to-surface contact, this effectively reduces the contact area, lowers the frictional resistance of the bearing unit, and improves the bearing's operating efficiency. Furthermore, point-to-surface contact reduces wear while improving lubrication, lowering bearing maintenance costs and enhancing equipment reliability. This addresses the technical limitation of existing double-row tapered roller bearings in improving low-friction performance. Therefore, this utility model effectively overcomes some practical problems in the prior art, thus possessing high utilization value and practical significance.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A bearing unit, characterized in that, include: Inner ring of bearing, The bearing outer ring is coaxially disposed outside the bearing inner ring; a first raceway, a second raceway, and a third raceway are formed between the bearing inner ring and the bearing outer ring, and the first raceway, the second raceway, and the third raceway are arranged sequentially at intervals along the axial direction; Multiple first drum-shaped rollers are installed on the first raceway and arranged along the outer circumference of the inner ring of the bearing; Multiple spherical rollers are installed in the second raceway and arranged along the outer circumference of the inner ring of the bearing; Multiple second drum-shaped rollers are installed in the third raceway and arranged along the outer circumference of the inner ring of the bearing.

2. The bearing unit according to claim 1, characterized in that, The bearing inner ring includes a first inner ring and a second inner ring; the first inner ring and the second inner ring are disposed opposite to each other, and the inward ends of the first inner ring and the second inner ring abut against each other.

3. The bearing unit according to claim 2, characterized in that, The second raceway includes a second inner raceway, which is located at the junction of the first inner ring and the outer ring of the second inner ring.

4. The bearing unit according to claim 2, characterized in that, The bearing unit also includes an inner ring connector, which is snapped into the inner cavity of the first inner ring and the second inner ring.

5. The bearing unit according to claim 1, characterized in that, The bearing unit also includes a retainer disposed on the outside of the plurality of spherical rollers.

6. The bearing unit according to claim 1, characterized in that, Multiple first drum-shaped rollers are fully installed in the first raceway, and multiple second drum-shaped rollers are fully installed in the third raceway.

7. The bearing unit according to claim 2, characterized in that, The axis of the first drum-shaped roller intersects the axis of the inner ring of the bearing, and the first drum-shaped roller is inclined along the outer edge of the outer ring of the bearing to the abutment of the first inner ring and the second inner ring.

8. The bearing unit according to claim 7, characterized in that, The acute angle between the axis of the first drum-shaped roller and the axis of the inner ring of the bearing is α, where 40°≤α≤50°.

9. The bearing unit according to claim 7 or 8, characterized in that, The second drum-shaped roller is symmetrically arranged on both sides of the first drum-shaped roller.

10. A transmission system, characterized in that, Includes the bearing unit as described in any one of claims 1 to 9.

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