CN115614380A - Multi-row multi-point contact type ball bearing and manufacturing method thereof - Google Patents

Abstract

The invention provides a multi-row multi-point contact type ball bearing and a manufacturing method thereof, and mainly solves the problems that in the prior art, a bearing raceway is split into two halves and then spliced, so that the overall rigidity of the raceway is damaged, the overall rigidity of the bearing is reduced, and balls are easily abraded; meanwhile, the problem that the size and the direction of the load borne by the single-row multi-point contact type ball bearing are relatively limited is solved. The multi-row multi-point contact type ball bearing comprises a bearing outer ring and a bearing inner ring, wherein N bearing inner raceways are arranged on the bearing outer ring, and N bearing outer raceways matched with the bearing inner raceways are arranged on the bearing inner ring; the bearing inner raceway and the bearing outer raceway form a bearing raceway, and bearing balls are arranged in the bearing raceway; the section of each bearing raceway comprises at least one section of arc which is not coincident with the circle center of the section, and the arcs of the bearing raceways are randomly arranged; n axial holes are formed in the bearing inner ring, and ball filling holes are formed in the positions, corresponding to the bearing outer rolling paths, of the axial holes.

Description

Multi-row multi-point contact type ball bearing and manufacturing method thereof

Technical Field

The invention relates to a multi-row multi-point contact type ball bearing and a manufacturing method thereof, wherein the multi-row multi-point contact type ball bearing and the manufacturing method thereof are particularly suitable for a speed reducer or a planet wheel.

Background

The double-row ball bearing adopts a double-row deep groove ball shaft-shaped raceway, the raceway and balls have good tightness, the double-row ball bearing can bear radial loads and loads acting in two axial directions within a certain range, and the double-row deep groove ball bearing is suitable for bearing configuration with insufficient load capacity of a single-row deep groove ball bearing.

However, most raceways of the double-row ball bearing are installed in a splicing manner, a gap is formed in the raceway after installation, for example, a lower raceway of a certain row of the four-point contact ball bearing is taken as an example, as shown in fig. 1, a dotted line is a steel ball interface in the four-point contact ball bearing, an ABECD section is a lower raceway (also called as a bearing outer raceway) profile, wherein circle centers of an AB section arc, a CD section arc and the steel ball are different, a curvature center of the AB section is P, a curvature center of the CD section is Q, and a curvature center of the steel ball is O.

The raceway is divided into two parts in the machining process, namely an AE section and a DE section, and during assembly, a half part of the raceway (such as the AE section) is assembled first, then a steel ball is loaded, and finally the rest half part is loaded.

It is also obvious from the attached figure of CN00206947.4 that its bearing inner ring is split type. CN210623387U provides a multi-row combined bearing structure mode, and improves the centering positioning assembly of each row of balls and the radial and axial approximate bidirectional bearing performance, but the inner ring or the outer ring of the bearing is still split. Although the method is easy to assemble, the integral rigidity of the raceway is damaged, and the integral rigidity of the bearing is reduced; the manufacturing manufacturability becomes poor; in addition, the shape and position accuracy such as the fitting degree and the coaxiality of the two half roller paths is difficult to guarantee in split type manufacturing, and the error in accuracy can cause the damage of the pre-tightening state of the bearing, so that the possibility of abrasion of the steel balls is greatly increased, and the service life of the bearing is shortened.

Therefore, it is desirable to provide a multi-row multipoint contact ball bearing to cope with the application scenario of multi-direction high strength and large load.

Disclosure of Invention

The invention provides a multi-row multi-point contact type ball bearing and a manufacturing method thereof, and mainly solves the problems that in the prior art, a bearing raceway is split into two halves and then spliced, so that the overall rigidity of the raceway is damaged, the overall rigidity of the bearing is reduced, and balls are easily abraded; furthermore, the preferable scheme of the invention also solves the problem that the single-row multipoint contact type ball bearing bears the relatively limited load in size and direction.

The principle of the invention is as follows:

firstly, the existing spliced raceway is adjusted into an integrated raceway, and secondly, the number of rows of balls is increased and the direction of the cambered surface of the raceway of each row of balls is adjusted, so that the strength of the bearing is improved, the stress direction is increased, and the service life is prolonged; aiming at the arc surface direction of the raceway, the stress condition of each direction in practical application occasions can be combined for pertinence improvement, and if the stress condition of each direction is relatively uniform, the stress condition of each direction can also be randomly distributed.

The biggest difficulty encountered in the actual design process of the scheme is that the conventional bearings are all installed in a splicing mode, and the conventional technical means is overcome, so that the design purpose is achieved. Because the ball of the bearing works in the raceway, if the raceway is directly manufactured and molded at one time, how to fill the ball is very difficult; meanwhile, the problem is solved by the aid of the arrangement and installation of the balls in multiple rows and the balls in single rows, and the difficulty of the problem is improved exponentially.

Based on the situation, the invention adopts the idea that the bearing raceway is manufactured and molded according to the load in each direction, then holes are respectively formed on the side wall of the raceway, and finally the separated balls are filled.

The specific technical solution of the invention is as follows:

the multi-row multi-point contact type ball bearing comprises a bearing outer ring and a bearing inner ring, wherein N bearing inner raceways are arranged on the bearing outer ring, and N bearing outer raceways matched with the bearing inner raceways are arranged on the bearing inner ring; the bearing inner raceway and the bearing outer raceway form a bearing raceway, and bearing balls are arranged in the bearing raceway; n axial holes are formed in the bearing inner ring, ball filling holes are formed in the positions, corresponding to the bearing outer roller paths, of the axial holes, and anti-falling-out structures for preventing balls from falling off are arranged in the ball filling holes; n is a natural number and is more than or equal to 2.

Likewise, the relevant components may also all be provided on the bearing outer ring.

Furthermore, the section of each bearing raceway comprises at least one section of arc which is not coincident with the circle center of the section, and the arcs of the bearing raceways are randomly arranged.

Further, when said N is 2,

the first bearing raceway comprises four sections of eccentric arcs, and each section of the arc occupies 1/4 of the perimeter of the section;

the second bearing raceway comprises four sections of eccentric arcs, and each section occupies 1/4 of the perimeter of the section;

the arc of the first bearing raceway is the same as the arc of the second raceway.

Further, when said N is 2,

the first bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section;

the second bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section;

the arc of the first bearing raceway and the arc of the second raceway are arranged in a mirror image.

Further, when the N is 3,

the first bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section;

the third bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the cross section;

the second bearing raceway comprises four sections of eccentric arcs, and each section occupies 1/4 of the perimeter of the section;

the arc of the first bearing raceway and the arc of the third raceway are arranged in a mirror image manner.

Furthermore, the bearing outer ring is a planetary reducer inner gear shell or a planetary reducer body shell, and the bearing inner ring is an output end planet carrier.

Furthermore, a limiting hole is formed in the bearing inner ring and communicated with the ball filling hole; and a limiting device for preventing the anti-falling structure from moving is arranged in the limiting hole.

Furthermore, the limiting hole is a screw hole parallel to the axial hole, and the limiting device is a fastening screw.

The manufacturing and assembling method of the multi-row multi-point contact type ball bearing comprises the following steps:

1, manufacturing a bearing outer ring and N bearing inner raceways on the bearing outer ring;

manufacturing at least one axial hole and N ball filling holes in the bearing inner ring and the bearing outer ring;

manufacturing a bearing inner ring and N bearing outer raceways on the bearing inner ring, and communicating the axial hole with the bearing outer raceways through a ball filling hole;

ball loading

4.1, filling a ball into a raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to enable the balls filled in the step 4.1 to stagger the ball filling holes;

4.3, filling a ball into the raceway through the ball filling hole;

4.4, circulating the steps 4.2 to 4.3 until all the balls are filled into the roller path;

4.5, circulating the steps 4.1 to 4.4 to fill other roller paths until all the roller paths are filled;

or 4.1, respectively filling a ball into each raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to ensure that the balls filled in the step 4.1 are staggered with the ball filling holes;

4.3, filling a ball into each raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into each raceway;

5, installing an anti-falling structure plug in the ball filling hole.

Further, the manufacturing method of the multi-row multi-point contact type ball bearing comprises the following steps:

1, manufacturing a bearing outer ring and N bearing inner raceways on the bearing outer ring;

manufacturing an axial hole, N ball filling holes and N limiting holes in the inner ring of the bearing; after the axial hole, the ball filling hole and the limiting hole are manufactured, pin shafts are respectively arranged in the N ball filling holes, then each pin shaft is fixed through the limiting device arranged in each limiting hole, and after the pin shafts are fixed, the pin shafts are manufactured, so that one ends of the pin shafts, which are far away from the inner raceway of the bearing, are coplanar with the hole wall of the axial hole;

or, firstly, manufacturing N ball filling holes and N limiting holes on the bearing inner ring; after the N ball filling holes and the limiting holes are manufactured, pin shafts are arranged in the N ball filling holes, the pin shafts are fixed through the limiting devices arranged in the limiting holes, and after the pin shafts are fixed, axial holes are manufactured, so that one end, away from the inner raceway of the bearing, of each pin shaft is coplanar with the hole walls of the axial holes;

manufacturing a bearing inner ring and N bearing outer raceways on the bearing inner ring, and manufacturing each pin shaft extending into the bearing outer raceways through a ball filling hole while manufacturing the N bearing outer raceways so that one end of each pin shaft extending into the bearing outer raceways is coplanar with the wall of the bearing outer raceway; after the manufacturing is finished, the pin shaft and the limiting device are removed;

ball packing

4.1, filling a ball into a roller path through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to enable the balls filled in the step 4.1 to stagger the ball filling holes;

4.3, filling a ball into the raceway through the ball filling hole;

4.4, circulating the steps 4.2 to 4.3 until all the balls are filled into the roller path;

4.5, circulating the steps 4.1 to 4.4 to fill other roller paths until all the roller paths are filled;

or 4.1, respectively filling a ball into each raceway through the ball filling hole manufactured in the step 3;

4.2, rotating the outer ring of the bearing, and enabling the balls filled in the step 4.1 to stagger the ball filling holes;

4.3, filling a ball into each raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into each raceway;

and 5, installing a pin shaft plug in the ball filling hole, and installing a limiting device in the limiting hole to fix the pin shaft.

Likewise, the relevant components may also all be provided on the bearing outer ring.

The invention has the advantages that:

1. according to the multi-row multi-point contact type ball bearing provided by the invention, the balls are installed in a filling mode, the problem that the outer raceway of the traditional inner bearing is inevitably provided with splicing gaps due to the adoption of an up-and-down splicing structure is solved, the manufactured outer raceway of the inner bearing is formed at one time, the manufacturing precision is improved, the rigidity of the raceway is effectively ensured, and the abrasion of the balls in the raceway due to the splicing type raceway gaps is reduced.

2. Compared with the traditional bearing, the multi-column multi-point contact type ball bearing provided by the invention has the advantages that the rigidity of the raceway is greatly increased, so that the performance of the whole bearing is improved, the bearing can bear large loads in multiple directions, the service life is long, and the reliability is high.

3. The multi-column multi-point contact type ball bearing provided by the invention has more columns which can be determined according to actual use occasions, so that theoretically, the load with any strength can be realized; meanwhile, because the radian of the ball paths of all rows of balls can be randomly adjusted, the bearing can bear loads in any direction, and normal work of large omnidirectional loads is realized.

4. When the multi-row multi-point contact type ball bearing provided by the invention adopts four-point face-to-face or back-to-back mirror image arrangement, because the stress point connecting line of the steel balls is consistent with the rotation axis and is basically pure rolling friction, the adaptability to high-speed rotation is greatly improved.

Drawings

FIG. 1 is a schematic view of a lower raceway of a conventional four-point contact ball bearing;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of the present invention applied to a decelerator;

FIG. 5 is a schematic structural diagram of two columns of four-point contact embodiments of the present invention;

FIG. 6 is a schematic structural diagram of two rows of back-to-back mirror image embodiments of the present invention;

FIG. 7 is a schematic diagram of two-column face-to-face mirror image embodiments of the present invention;

FIG. 8 is a schematic diagram of three exemplary embodiments of the present invention;

the attached drawings are as follows:

the bearing comprises a bearing outer ring 1, a bearing inner ring 2, a bearing inner raceway 3, a bearing outer raceway 4, an axial hole 5, a limiting hole 6, a ball 7 and a ball filling hole 8.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the present invention, "at least one" means one or more, "a plurality" means two or more. "at least one item" or the like, refers to any combination of these items, including any combination of the singular or plural items. For example, "at least one (one) of a, b, or c," or "at least one (one) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

From a structural point of view, firstly:

as shown in fig. 2 and 3, the multi-row multi-point contact type ball 7 bearing comprises a bearing outer ring 1 and a bearing inner ring 2, wherein N bearing inner raceways 3 are arranged on the bearing outer ring 1, N bearing outer raceways 4 matched with the bearing inner raceways 3 are arranged on the bearing inner ring 2, each bearing inner raceway 3 and each bearing outer raceway 4 form N bearing raceways, the bearing balls 7 are arranged in the bearing raceways, and the N bearing raceways are isolated from each other in space; wherein N is a natural number, and N is more than or equal to 2, namely, the number of the bearing inner rolling paths 3 and the number of the bearing outer rolling paths 4 are the same and are a plurality or at least 2.

The cross section of a normal bearing inner raceway 3 is circular, a bearing outer raceway 4 consisting of two sections of eccentric arcs is arranged on an inner ring 2 of the four-point contact type bearing raceway bearing, and the cross section of the bearing outer raceway is semicircular and combines the two sections of eccentric arcs, so that loads applied in four directions can be borne, and even if the loads are not aligned, the loads can be unloaded by relative spatial deviation.

In a relatively better scheme of the multi-row multi-point contact type bearing provided by the invention, the cross section of each bearing raceway comprises at least one section of arc (eccentric arc) which does not coincide with the circle center of the cross section, and the arcs of each bearing raceway are randomly arranged, so that the number of load directions is only related to the number of arc sections and the circle center position of the arc, and the more the circle center positions and the number of arc sections, the stronger the unloading capacity for each direction and the total load.

When two or more rows of raceways are provided, three different combinations can be considered:

1. the completely random arrangement mode, namely, the number of arcs and the position of the circle center of each row are randomly arranged;

2. the arrangement mode is completely repeated, namely, the number of arcs and the position of the circle center of each row are arranged in the same way;

3. mirror image arrangement mode: there are two branches to this approach:

(1) the middle row is fixed, and the rows on both sides are mirror images, that is, at least one row in the center is completely the same, that is, the number of arcs and the position of the center of the circle of the center row are the same, in this case, the center row is preferably a four-segment eccentric arc structure with a four-point contact type, and the structure of the mirror images on both sides selects a structure in which two segments of eccentric arcs are located on the same side segment; the structure is generally considered in the case of odd columns, so that the structure is relatively balanced.

(2) All the mirror images, that is, all the columns distributed on one side include a section of arc, and all the columns distributed on the opposite side include a section of mirror image arc, that is, the mirror images on both sides are arranged, which is equivalent to single-multi-group four-point contact type mirror image replication; the structure is generally considered in the case of even columns, so that the structure is relatively balanced.

Considering the practical use condition and the processing cost, three specific reference structures are given as follows:

1. as shown in fig. 5, the number of rows of raceways is 2, the first bearing raceway includes four arcs that do not coincide with the circle center of the cross section, and each segment occupies 1/4 of the perimeter of the cross section; the second bearing raceway also comprises four sections of arcs which are not coincident with the circle center of the cross section, and each section occupies 1/4 of the perimeter of the cross section; the arc of the first bearing raceway is the same as the arc of the second raceway. The method is equivalent to repeatedly combining the traditional four-point contact type ball 7 bearing into a double-row four-point contact type ball 7 bearing.

2. The number of the raceway rows is 2, the first bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the section perimeter; the second bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section; the arcs of the first bearing raceways and the arcs of the second raceways are arranged in mirror image, exhibiting a configuration that is either back-to-back mirror image (as shown in fig. 6), or face-to-face mirror image (as shown in fig. 7). Compared with the traditional four-point contact type ball 7 bearing, the scheme decomposes the traditional two sections of eccentric arcs into two rows of rolling paths, and the two rows of rolling paths realize four-point contact together, so that the bearing capacity is exponentially increased. Therefore, the bearing performance is greatly improved as a whole.

3. As shown in fig. 8, the number of the raceway rows is 3, and the first bearing raceway includes a circular arc which is not coincident with the center of the cross section and occupies 1/4 of the perimeter of the cross section; the third bearing raceway comprises a section of circular arc which is not coincident with the circle center of the cross section and occupies 1/4 of the perimeter of the cross section; the second bearing raceway comprises two sections of eccentric arcs which account for 1/2 of the perimeter of the section; the arc of the first bearing raceway and the arc of the third raceway are arranged in mirror image. Compared with the 2-row ball tracks, the bearing capacity of the 3-row balls 7 is further enhanced, more circular arc structures can be selected for the 3-row ball track structures and the above 3-row ball track structures, and the specific selection can be considered by combining with the actual working conditions. The mirror image and center four-point contact combined mode can be suitable for most application occasions, axial and radial loads can be borne, and particularly in the high-speed rotating process, the performance is very excellent.

In order to facilitate installation, at least one axial hole 5 is formed in the bearing inner ring 2, when one axial hole 5 is formed, all ball filling holes 8 are formed in the axial hole 5, when the number of rows is small, one axial hole 5 can be considered, but when the number of rows is large, an excessively deep axial hole 5 is considered, the rigidity of the whole bearing can be influenced, and therefore the axial holes can be uniformly distributed; taking the axial holes 5 with the same quantity as the raceways as an example, the positions of the axial holes 5 corresponding to the bearing outer raceways 4 are provided with ball filling holes 8, the ball filling holes 8 communicate the axial holes 5 with the bearing inner ring 2 and the bearing outer raceways 4, during processing, the balls 7 are firstly sent into the axial holes 5 of each row, then the balls 7 are filled into the row of raceways through the corresponding ball filling holes 8, after the balls 7 in all rows of raceways are filled completely, the ball filling holes 8 are internally provided with anti-falling structures for preventing the balls 7 from falling off, and the installation can be completed. It is also conceivable to provide the axial bore 5 and the associated components on the bearing outer ring 1.

The anti-stripping structure has a plurality of selectable forms, and the aim is that at least the ball 7 cannot be stripped from the ball filling hole 8 in the working process, especially under the condition of large load after the processing is finished; preferably, not only the balls 7 are not removed from the ball filling holes 8 during operation, but also the raceways can be opened to remove the balls 7 when maintenance is required.

The ball filling holes 8 should be made perpendicular to the raceways, i.e.: the direction perpendicular to the axial hole 5 is set to be optimal, and an oblique direction can also be set, but when the oblique direction is set, firstly, the processing cost can be increased, and secondly, the risk of reducing the rigidity of the bearing exists.

Based on the above conditions, two specific structures are given for reference.

1. Set up isosceles trapezoid elastic sleeve in ball filling hole 8, the great bottom surface of this sleeve pipe area is towards the bearing center, the less top surface of area is towards 1 bearing inner raceway 3 of bearing inner race of bearing outer lane, the great diameter of area is greater than ball 7 diameter, the less diameter of area is less than ball 7 diameter, but the difference need ensure that the deformation that produces when the installation can extrude ball 7, can guarantee that ball 7 is not extruded through its intensity when this position department atress when ball 7 during operation simultaneously.

When the structure is selected, it is also possible to increase the plugs after the steel balls are all loaded, and directly extrude the plugs into the ball loading holes 8. However, if the plug is added, the surface of one end of the plug extending into the raceway is ensured to be coplanar with the raceway wall, so that the ball 7 is prevented from being damaged due to uneven extrusion.

2. And a pin shaft is arranged in the ball filling hole 8, a limiting hole 6 is arranged on the bearing inner ring 2, the limiting hole 6 is at least communicated with the ball filling hole 8, and a limiting device is arranged in the limiting hole 6 so as to position the pin shaft. The limiting hole 6 is preferably formed in a manner that a central shaft is parallel to a central shaft of the axial hole 5, so that the stress is relatively balanced when the limiting and jacking are carried out. The limiting device can select a structure such as a tightening screw and the like, and the pin shaft is fixed. For a multi-column structure, the limiting holes 6 are arranged in a staggered mode, the limiting holes 6 which are closer to the central column are deeper, in this case, the axial holes 5 are equal to the number of the raceways, and otherwise, certain problems exist when the limiting holes 6 are formed.

In the machining of the bearing, the following steps may be adopted, but it should be understood that, in various embodiments of the present invention, the order of the sequence numbers of the processes does not imply the order of execution, some or all of the steps may be executed in parallel or in sequence, and the order of execution of the processes should be determined by their functions and inherent logic, and should not limit the implementation process of the embodiments of the present invention in any way.

1. Processing without a limit structure:

1, manufacturing a bearing outer ring 1 and N bearing inner raceways 3 on the bearing outer ring 1;

2, manufacturing N axial holes 5 and N ball filling holes 8 on the bearing inner ring 2 and the bearing outer ring 1;

3, manufacturing a bearing inner ring 2 and N bearing outer raceways 4 on the bearing inner ring 2, and communicating the axial hole 5 with the bearing outer raceways 4 through a ball filling hole 8;

ball loading

Before the ball is filled, the bearing inner ring is arranged in the bearing outer ring, preferably in the same plane, so that the ball is conveniently filled;

4.1, filling a ball 7 into a raceway through the ball filling hole 8 manufactured in the step 3; grease can be coated in the ball 7 and/or the roller path to reduce the installation difficulty;

4.2 ] rotating the outer ring 1 of the bearing to enable the balls 7 filled in the step 4.1 to be staggered with the ball filling holes 8;

4.3 filling a ball 7 into the raceway through the ball filling hole 8;

4.4, the steps 4.2 to 4.3 are circulated until all the balls 7 are filled into the roller path;

4.5, circulating the steps 4.1 to 4.4 to fill other roller paths until all the roller paths are filled;

or 4.1, respectively filling a ball 7 into each raceway through the ball filling hole 8 manufactured in the step 3;

4.2 ] rotating the outer ring 1 of the bearing to enable the balls 7 filled in the step 4.1 to be staggered with the ball filling holes 8;

4.3 filling a ball 7 into each raceway through a ball filling hole 8;

4.4, the steps 4.2 to 4.3 are circulated until all the balls 7 are filled into each raceway;

and 5, installing an anti-falling structure plug in the ball filling hole.

2. Processing with a limiting structure:

1, manufacturing a bearing outer ring 1 and N bearing inner raceways 3 on the bearing outer ring 1;

2, manufacturing an axial hole 5, N ball filling holes 8 and N limiting holes 6 on the bearing inner ring 2; after the axial hole 5, the ball filling holes 8 and the limiting holes 6 are manufactured, respectively installing pin shafts in the N ball filling holes 8, then installing limiting devices in the limiting holes 6 to fix the pin shafts, and manufacturing the pin shafts after fixing, so that one ends of the pin shafts, far away from the bearing inner raceway 3, are coplanar with the hole wall of the axial hole 5;

or, firstly, manufacturing N ball filling holes 8 and N limiting holes 6 on the bearing inner ring 2; after the N ball filling holes 8 and the N limiting holes 6 are manufactured, pin shafts are arranged in the N ball filling holes 8, then the limiting holes 6 are arranged in limiting devices to fix the pin shafts, and after the pin shafts are fixed, axial holes 5 are manufactured, so that one ends of the pin shafts, far away from the inner raceway 3 of the bearing, are coplanar with the hole walls of the axial holes 5;

3, manufacturing a bearing inner ring 2 and N bearing outer rolling ways 4 on the bearing inner ring 2, manufacturing each pin shaft extending into the bearing outer rolling way 4 through a ball filling hole 8 while manufacturing the N bearing outer rolling ways 4, and enabling one end of each pin shaft extending into the bearing outer rolling way 4 to be coplanar with the wall of the bearing outer rolling way 4; after the manufacturing is finished, the pin shaft and the limiting device are removed;

ball loading

Before the ball is filled, the bearing inner ring is arranged in the bearing outer ring, preferably in the same plane, so that the ball is conveniently filled;

4.1, filling a ball 7 into a raceway through the ball filling hole 8 manufactured in the step 3; grease can be coated in the ball 7 and/or the roller path to reduce the installation difficulty;

4.2 ] rotating the bearing outer ring 1 to enable the balls 7 filled in the step 4.1 to stagger the ball filling holes 8;

4.3 filling a ball 7 into the raceway through the ball filling hole 8;

4.4 ] circulating the steps 4.2 to 4.3 until all the balls 7 are filled into the roller path;

4.5, circulating the steps 4.1 to 4.4 to fill other roller paths until all the roller paths are filled;

or 4.1, respectively filling a ball 7 into each raceway through the ball filling hole 8 manufactured in the step 3;

4.2 ] rotating the outer ring 1 of the bearing to enable the balls 7 filled in the step 4.1 to be staggered with the ball filling holes 8;

4.3 filling a ball 7 into each raceway through a ball filling hole 8;

4.4, the steps 4.2 to 4.3 are circulated until all the balls 7 are filled into each raceway;

and 5, installing a pin shaft plug in the ball filling hole, and installing a limiting device in the limiting hole 6 to fix the pin shaft.

The bearing structure and the processing method can be directly applied to a planetary gear reducer, as shown in fig. 4, specifically, the bearing structure and the processing method are as follows:

the outer bearing ring 1 of the multi-row multi-point contact type ball 7 bearing is equal to an inner gear shell of a planet gear speed reducer, the inner bearing ring 2 is equal to a planet carrier at the output end of the planet gear speed reducer, and the rest parts are equal.

Likewise, the structure used for mounting can also be arranged on the bearing outer ring.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A multiseriate multiple spot contact ball bearing which characterized in that:

the bearing comprises a bearing outer ring and a bearing inner ring, wherein the bearing outer ring is provided with N bearing inner raceways, and the bearing inner ring is provided with N bearing outer raceways matched with the bearing inner raceways;

the bearing inner raceway and the bearing outer raceway form a bearing raceway, and bearing balls are arranged in the bearing raceway;

the bearing inner ring is provided with at least one axial hole, N ball filling holes are formed in the axial hole and the position corresponding to the bearing outer raceway, and an anti-falling structure for preventing balls from falling off is arranged in each ball filling hole;

or the bearing outer ring is provided with at least one axial hole, the axial hole and the position corresponding to the inner raceway of the bearing are provided with N ball filling holes, and each ball filling hole is internally provided with an anti-falling structure for preventing the balls from falling off;

n is a natural number and is more than or equal to 2.

2. The multi-row multipoint contact ball bearing of claim 1, wherein: the section of each bearing raceway comprises at least one section of circular arc which is not coincident with the circle center of the section.

3. The multi-row multipoint contact ball bearing according to claim 2, wherein:

when the N is 2, the reaction solution is,

the first bearing roller path comprises four sections of eccentric circular arcs, and each section of the arc occupies 1/4 of the section perimeter;

the second bearing raceway comprises four sections of eccentric arcs, and each section occupies 1/4 of the perimeter of the section;

the arc of the first bearing raceway is the same as the arc of the second raceway.

4. The multi-row multipoint contact ball bearing of claim 2, wherein:

when the N is 2, the reaction solution is,

the first bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section;

the second bearing roller path comprises two sections of eccentric circular arcs, and each section occupies 1/2 of the perimeter of the section;

the arc of the first bearing raceway and the arc of the second raceway are arranged in a mirror image.

5. The four-point contact ball bearing of claim 2, wherein:

when the number N is 3, the reaction is carried out,

the first bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the section;

the third bearing raceway comprises two sections of eccentric arcs, and each section occupies 1/2 of the perimeter of the cross section;

the second bearing raceway comprises four sections of eccentric arcs, and each section occupies 1/4 of the perimeter of the section;

the arc of the first bearing raceway and the arc of the third raceway are arranged in a mirror image manner.

6. The multi-row multipoint contact ball bearing according to any of claims 1 to 5, wherein:

the bearing outer ring is a planetary reducer inner gear shell or a planetary reducer body shell, and the bearing inner ring is an output end planet carrier.

7. The multi-row multipoint contact ball bearing of claim 6, wherein: the bearing inner ring or the bearing outer ring is also provided with a limiting hole which is communicated with the ball filling hole; and a limiting device for preventing the anti-falling structure from moving is arranged in the limiting hole.

8. The multi-row multipoint contact ball bearing of claim 7, wherein: the limiting hole is a screw hole parallel to the axial hole, and the limiting device is a fastening screw.

9. A manufacturing method of a multi-row multi-point contact type ball bearing is characterized by comprising the following steps:

1, manufacturing a bearing outer ring and N bearing inner raceways on the bearing outer ring;

manufacturing a bearing inner ring and at least one axial hole and N ball filling holes in the bearing inner ring;

manufacturing N bearing outer raceways on the bearing inner ring, and communicating the axial hole with the bearing outer raceways through a ball filling hole;

or

1, manufacturing a bearing inner ring and N bearing outer raceways on the bearing inner ring;

manufacturing a bearing outer ring and at least one axial hole and N ball filling holes in the bearing outer ring;

manufacturing N bearing inner raceways on the bearing outer ring, and communicating the axial hole with the bearing inner raceways through a ball filling hole;

ball loading

4.1, filling a ball into a roller path through the ball filling hole manufactured in the step 3;

4.2, rotating the outer ring of the bearing, and enabling the balls filled in the step 4.1 to stagger the ball filling holes;

4.3 filling a ball into the raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into the roller paths;

4.5, circulating the steps 4.1 to 4.4 to fill other roller paths until all the roller paths are filled;

or 4.1, respectively filling a ball into each raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to ensure that the balls filled in the step 4.1 are staggered with the ball filling holes;

4.3, filling a ball into each raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into each raceway;

5, installing an anti-falling structure plug in the ball filling hole.

10. Method for manufacturing a multi-row multipoint contact ball bearing according to claim 9, characterized in that it comprises the following steps:

1, manufacturing a bearing outer ring and N bearing inner raceways on the bearing outer ring;

manufacturing an axial hole, N ball filling holes and N limiting holes in the inner ring of the bearing; after the axial hole, the ball filling hole and the limiting hole are manufactured, pin shafts are respectively arranged in the N ball filling holes, then each pin shaft is fixed through the limiting device arranged in each limiting hole, and after the pin shafts are fixed, the pin shafts are manufactured, so that one ends of the pin shafts, which are far away from the inner raceway of the bearing, are coplanar with the hole wall of the axial hole;

or, firstly, manufacturing N ball filling holes and N limiting holes on the bearing inner ring; after the N ball filling holes and the N limiting holes are manufactured, pin shafts are arranged in the N ball filling holes, the pin shafts are fixed through the limiting devices arranged in the limiting holes, and after the pin shafts are fixed, axial holes are manufactured, so that one end, away from the inner raceway of the bearing, of each pin shaft is coplanar with the hole wall of each axial hole;

manufacturing a bearing inner ring and N bearing outer raceways on the bearing inner ring, and manufacturing each pin shaft extending into the bearing outer raceways through a ball filling hole while manufacturing the N bearing outer raceways so that one end of each pin shaft extending into the bearing outer raceways is coplanar with the wall of the bearing outer raceway; after the manufacturing is finished, the pin shaft and the limiting device are removed;

ball loading

4.1, filling a ball into a raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to enable the balls filled in the step 4.1 to stagger the ball filling holes;

4.3 filling a ball into the raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into the roller paths;

4.5, circularly filling other roller paths from 4.1 to 4.4 until all the roller paths are filled;

or 4.1, respectively filling a ball into each raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to ensure that the balls filled in the step 4.1 are staggered with the ball filling holes;

4.3, filling a ball into each raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into each raceway;

and 5, installing a pin shaft plug in the ball filling hole, and installing a limiting device in the limiting hole to fix the pin shaft.

11. The method of manufacturing a plurality of rows of multi-point contact ball bearings according to claim 9, comprising the steps of:

1, manufacturing a bearing inner ring and N bearing outer raceways on the bearing inner ring;

manufacturing an axial hole, N ball filling holes and N limiting holes in the outer ring of the bearing; after the axial hole, the ball filling hole and the limiting hole are manufactured, pin shafts are respectively arranged in the N ball filling holes, then each pin shaft is fixed through the limiting device arranged in each limiting hole, and after the pin shafts are fixed, the pin shafts are manufactured, so that one ends of the pin shafts, which are far away from the bearing outer raceway, are coplanar with the hole wall of the axial hole;

or, firstly, manufacturing N ball filling holes and N limiting holes on the outer ring of the bearing; after the N ball filling holes and the N limiting holes are manufactured, pin shafts are arranged in the N ball filling holes, the pin shafts are fixed through the limiting devices arranged in the limiting holes, and after the pin shafts are fixed, axial holes are manufactured, so that one end, away from the bearing outer raceway, of each pin shaft is coplanar with the hole wall of each axial hole;

manufacturing a bearing outer ring and N bearing outer raceways on the bearing outer ring, and manufacturing each pin shaft extending into the bearing inner raceway through a ball filling hole while manufacturing the N bearing outer raceways so that one end of each pin shaft extending into the bearing inner raceway is coplanar with the wall of the bearing inner raceway; after the manufacturing is finished, the pin shaft and the limiting device are removed;

ball loading

4.1, filling a ball into a raceway through the ball filling hole manufactured in the step 3;

4.2 ] rotating the outer ring of the bearing to enable the balls filled in the step 4.1 to stagger the ball filling holes;

4.3 filling a ball into the raceway through the ball filling hole;

4.4, circulating the steps 4.2 to 4.3 until all the balls are filled into the roller path;

4.5, circularly filling other roller paths from 4.1 to 4.4 until all the roller paths are filled;

or 4.1, respectively filling a ball into each raceway through the ball filling hole manufactured in the step 3;

4.2, rotating the outer ring of the bearing, and enabling the balls filled in the step 4.1 to stagger the ball filling holes;

4.3, filling a ball into each raceway through the ball filling hole;

4.4, the steps 4.2 to 4.3 are circulated until all the balls are filled into each raceway;

and 5, installing a pin shaft plug in the ball filling hole, and installing a limiting device in the limiting hole to fix the pin shaft.

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