A cage structure for a single-row self-aligning roller bearing

Abstract

A kind of cage structure for single-row self-aligning roller bearing, adopts split structure, and is fixed into integrated cage structure by connecting piece, cage is evenly provided with several pockets, the shape of the middle part of pocket is cylindrical, and the shape of both ends of pocket is arc structure same as the shape of the end of installed spherical roller.By optimizing the structure, the end of both sides of pocket is machined into arc structure same as the shape of roller, which can guide spherical roller well and straighten the skew of roller movement, to avoid the problem that two half cages cannot be completely aligned due to the machining position precision of pocket, the middle section of pocket is designed as cylindrical, and the clearance between roller and pocket is larger than that of both end arc pocket section.The middle section of pocket does not contact with roller when bearing rotates, and does not participate in the straightening of roller skew;the straightening force only comes from both end arc pocket end.When roller is not skewed and contacts with pocket wall, there is an acting force in each of both end arc pocket section, which is balanced on roller to improve the stability of operation of self-aligning roller bearing.

Description

Technical Field

[0001] This utility model relates to the technical field of cage structures for bearings, specifically a cage structure for a single-row self-aligning roller bearing. Background Technology

[0002] As is well known, the existing single-row self-aligning roller bearing has the following structure: multiple spherical rollers are separated by a cage and embedded in the inner ring raceway. The spherical rollers, cage, and inner ring are connected together to form an inner assembly. The inner assembly can perform self-aligning action within the spherical raceway of the outer ring.

[0003] The following is a detailed analysis of the existing cage pocket shape for this type of bearing:

[0004] Firstly, it uses the same cylindrical pocket as cylindrical roller bearings. The spherical roller is placed in the cylindrical pocket, with the center of the spherical roller closest to the pocket wall. The further away the roller is from the center, the greater the distance between the roller and the pocket. This type of pocket structure is simple and relatively easy to process and assemble. However, when the roller is misaligned, both ends of the roller need to be misaligned a great deal in order to contact the pocket wall and be prevented from misaligning by the pocket. Therefore, this type of pocket cannot properly straighten the roller.

[0005] Secondly, a single-sided arc-shaped pocket is used, with the pocket machined on one side to match the shape of the roller, but slightly larger in size. The gap between the pocket wall and the roller on this side is uniform. When the roller is tilted, this end of the roller contacts the pocket wall first and is prevented from tilting. However, since the straightening force on the roller is unilateral, the roller will move to the other side with a higher degree of freedom while being straightened, which can easily cause additional vibration and noise.

[0006] Thirdly, a two-section arc-shaped pocket combination is used. This type of cage is actually composed of two parts, left and right, both with arc-shaped pockets. After the roller is installed into the left pocket, the right part of the cage is installed. The two parts are connected by a step fit and a connector. Because the left and right pockets are machined separately, it is difficult to ensure the consistency of size and position, and it is also difficult to ensure that the left and right pockets are aligned during installation. This usually leads to misalignment of the left and right pockets, which causes vibration and noise when the bearing is working.

[0007] The above analysis shows that the existing cage structures and pocket shapes cannot effectively stabilize the running posture of the spherical rollers when the bearing rotates, so a cage structure with better performance needs to be designed. Utility Model Content

[0008] The purpose of this invention is to propose a cage structure for a single-row self-aligning roller bearing. This solution can promptly correct the spherical rollers when they are misaligned, thereby improving the smoothness of the self-aligning roller bearing operation.

[0009] The technical solution adopted in this utility model is:

[0010] A cage structure for a single-row self-aligning roller bearing is disclosed. The cage adopts a split structure and is fixed into an integral cage structure by connecting parts. The cage has a plurality of pockets evenly provided for mounting spherical rollers. The middle part of the pocket is cylindrical, and the two ends of the pocket are arc-shaped, which are the same as the end shape of the spherical roller to be mounted. The gap between the middle part of the pocket and the spherical roller is greater than the gap between the two ends of the pocket and the spherical roller.

[0011] As a preferred embodiment, the retainer is divided into a first half retainer and a second half retainer along the middle of the pocket, and the first half retainer and the second half retainer are connected into an integral structure by rivets.

[0012] As a preferred embodiment, the connecting surfaces of the first half-cage and the second half-cage are provided with mutually cooperating steps.

[0013] As a preferred embodiment, the retainer is provided with rivet holes, which have larger diameters at both ends for clearance fit with the rivets, and smaller diameters in the middle for interference fit with the rivets.

[0014] As a preferred embodiment, the pocket has symmetrically arranged arc-shaped structures at both ends with equal lengths.

[0015] The beneficial effects of this utility model are:

[0016] To address the shortcomings of existing technologies, this solution provides a cage structure for a single-row self-aligning roller bearing. By optimizing the structure, the ends of the pockets are machined into arc shapes that match the roller shape, effectively guiding the rollers and correcting any misalignment during roller movement. To avoid misalignment issues caused by the machining accuracy of the two half-cage pockets, the middle section of the pocket is designed as a cylindrical structure with a larger clearance from the spherical rollers than the two end arc pocket sections. During bearing rotation, the middle section of the pocket does not contact the rollers and does not participate in correcting roller misalignment. The correcting force comes only from the two end arc pockets. When the rollers are not misaligned and are in contact with the pocket wall, each end arc pocket section exerts a force, which is applied evenly to the rollers, improving the smoothness of the self-aligning roller bearing operation.

[0017] As a further optimization, the cage is divided into a first half-cage and a second half-cage along the middle of the pocket. The mating surfaces of the left and right half-cages are provided with dimensionally matched steps to facilitate the radial alignment of the two half-cages. The rivet holes on them are larger at both ends to fit the rivet with a clearance fit, and smaller in the middle to fit the rivet with an interference fit. This allows for better circumferential positioning and improves the overall strength of the cage after riveting. Attached Figure Description

[0018] 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 the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the present invention in use;

[0020] Figure 2 A schematic diagram of the axial cross-section of the rivet holes for the cage;

[0021] Figure 3 A schematic diagram of the axial cross-section of the pocket on the retainer;

[0022] Figure 4 This is a cross-sectional schematic diagram of the arc-shaped structure at both ends of the pocket engaging with the spherical roller.

[0023] Reference numerals: 1-cage, 11-first half-cage, 12-second half-cage, 13-cylindrical structure, 14-arc structure, 2-spherical roller, 3-inner ring, 4-outer ring, 5-rivet. Detailed Implementation

[0024] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains; the words "a," "an," or "the" and similar terms used in the specification and claims of this utility model patent application do not express a quantity limitation, but rather indicate the presence of at least one; the words "comprising" or "including" and similar terms indicate that the elements or objects preceding "comprising" or "including" cover the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function;

[0026] To more clearly describe the specific composition of a cage structure for a single-row self-aligning roller bearing, this embodiment is described in detail with reference to the accompanying drawings:

[0027] like Figure 1As shown, when the cage is in use, the spherical roller 2 is installed in the pocket of the cage 1 and embedded in the raceway of the inner ring 3. The spherical roller 2, the cage 1 and the inner ring 3 are connected together to form an inner component and installed in the raceway of the outer ring 4. The inner component can perform self-aligning action in the spherical raceway of the outer ring 4.

[0028] like Figure 2 As shown, the retainer 1 adopts a split structure and is fixed into an integral retainer structure by connectors. In this embodiment, the retainer 1 is divided into a first half retainer 11 and a second half retainer 12 along the middle of the pocket. The first half retainer 11 and the second half retainer 12 are connected into an integral structure by rivets. The mating surfaces of the first half retainer 11 and the second half retainer 12 are provided with size-fitting steps to facilitate radial alignment of the two half retainers. The retainer is provided with rivet holes. The rivet holes have larger diameters at both ends, which are clearance fits with the rivets, and smaller diameters in the middle, which are interference fits with the rivets. This structure can better achieve circumferential positioning and improve the overall strength of the retainer after riveting.

[0029] like Figure 3-4 As shown, the cage has its pocket ends machined into arc-shaped structures with the same shape as the mounted spherical rollers, which can effectively guide the spherical rollers and correct their misalignment during movement. To avoid misalignment caused by the machining position accuracy of the two half-cage pockets, the middle of the pocket is machined into a cylindrical structure, and the gap between the middle of the pocket and the spherical roller is greater than the gap between the two ends of the pocket and the spherical roller. When the bearing rotates, the middle section of the pocket does not contact the spherical roller and does not participate in correcting the misalignment of the roller. The correcting force comes only from the arc-shaped structures at both ends. When the roller is not misaligned and is in contact with the pocket wall, each arc-shaped pocket section at both ends exerts a force, which is applied evenly to the roller to maintain the stability of their movement. When the two ends of the pocket mate with the roller, as... Figure 4 As shown, this structure can better constrain the rollers. When the rollers are tilted, they are subjected to force on one side, which helps them return to their balanced position.

[0030] In this embodiment, the pocket has symmetrically arranged arc-shaped structures at both ends with equal lengths.

[0031] When assembling the cage, first, the outer ring, half cage, and inner ring are nested together in sequence. Then, the half cage and inner ring are screwed out of the outer ring raceway to form a cross shape. The spherical rollers are then installed in sequence. The rollers at the cross-blocking position of the inner and outer rings can be installed in other positions. After the rollers are installed, the inner component formed by the cage, spherical rollers, and inner ring is rotated to rotate the empty pocket to the cross-blocking position, and then the remaining spherical rollers are installed.

[0032] Next, screw the inner components into the outer raceway, lay the bearing flat with the half cage facing down, snap in the second half cage, and press in the rivets; turn the bearing over and tighten the rivets to complete the assembly of the self-aligning roller bearing.

[0033] The parts not described in detail in the above embodiments are existing technologies.

[0034] It should be noted that although the present invention has been described through the above embodiments, there may be other various embodiments of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A cage structure for a single-row self-aligning roller bearing, wherein the cage adopts a split structure and is fixed into an integral cage structure by connecting members, and a plurality of pockets are evenly provided on the cage, characterized in that: The central part of the pocket is cylindrical, and the two ends of the pocket are arc-shaped, which are the same as the end shapes of the spherical rollers. The gap between the central part of the pocket and the spherical rollers is greater than the gap between the two ends of the pocket and the spherical rollers.

2. The cage structure for a single-row self-aligning roller bearing according to claim 1, characterized in that: The retainer is divided into a first half retainer and a second half retainer along the middle of the pocket, and the first half retainer and the second half retainer are connected by rivets to form an integral structure.

3. The cage structure for a single-row self-aligning roller bearing according to claim 2, characterized in that: The connecting surfaces of the first half-cage and the second half-cage are provided with mutually cooperating steps.

4. The cage structure for a single-row self-aligning roller bearing according to claim 2, characterized in that: The retainer is provided with rivet holes, which have larger diameters at both ends for clearance fit with the rivet, and smaller diameters in the middle for interference fit with the rivet.

5. The cage structure for a single-row self-aligning roller bearing according to claim 1, characterized in that: The pocket has symmetrically arranged arc-shaped structures at both ends with equal lengths.

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