Herringbone planetary roller bearing

Abstract

The utility model relates to a herringbone planetary roller bearing which comprises an outer sleeve ring, an inner sleeve ring and a plurality of planetary rollers, a first thread channel and a second thread channel which are opposite in thread turning direction are formed in the outer walls of the left end and the right end of the inner sleeve ring, and a third thread channel opposite to the first thread channel is formed in the inner wall of the outer ring at the left end. A fourth threaded channel opposite to the second threaded channel is formed in the inner wall of the right end outer ring; a fifth thread channel and a sixth thread channel which are opposite in thread turning direction are respectively formed in the outer walls of the left end and the right end of the planetary roller; a fifth threaded channel on the planetary roller is respectively screwed with a first threaded channel of the inner ferrule and a third threaded channel of the left-end outer ring, and a sixth threaded channel is respectively screwed with a second threaded channel of the inner ferrule and a fourth threaded channel of the right-end outer ring; the planetary roller bearing has the function of an angular contact bearing, and a more effective and reliable solution is provided for application scenes of heavy load and long service life.

Description

Technical field:

[0001] The utility model relates to the technical field of bearings, and more specifically to a herringbone planetary roller bearing. Background technology:

[0002] Roller bearings belong to the category of high-end bearings, and rollers are the components that bear the load when the bearing is running. They are the key parts of rolling bearings. Their load capacity, life and reliability have a great impact on the precision, performance, life and reliability of complete sets of bearings. The roller shapes of existing roller bearings on the market are mainly tapered rollers, cylindrical rollers, and spherical rollers. There is still room for optimization in the various performances and functions of existing roller bearings. The rolling element type and motion logic can be used as a breakthrough, and they can be upgraded according to the design principle similar to the reverse planetary screw, so as to optimize the design structure of the roller bearing. For example, there are currently planetary roller bearings with an annular tooth groove meshing structure with a helix angle of zero degrees. The rollers are formed with multiple roller V-shaped annular grooves, and the outer ring and inner ring of the bearing are respectively formed with annular teeth that match the annular grooves. Based on the meshing between the two, the function of the bearing is realized. However, its bearing structure is in the category of deep groove ball bearings, and the axial load-bearing performance is poor. It is difficult to assemble and adjust the clearance. In order to improve the axial load performance of the bearing, simplify the difficulty of bearing assembly, and facilitate installation and use, we can consider the direction of reverse planetary roller screws and angular contact bearings and design a planetary roller bearing with the function of matching angular contact bearings. Utility model content:

[0003] The purpose of the utility model is to address the deficiencies of the prior art and to provide a herringbone planetary roller bearing, wherein the planetary roller bearing has the function of an angular contact bearing, providing a more effective and reliable solution for heavy-load and long-life application scenarios.

[0004] A herringbone planetary roller bearing comprises an outer ring, an inner ring and a plurality of planetary rollers, wherein the planetary rollers are inserted between the inner ring and the outer ring, wherein the outer ring is composed of a left outer ring, a right outer ring and a spacer, wherein the spacer is clamped between the left outer ring and the right outer ring; a first thread groove and a second thread groove with opposite thread rotation directions are formed on the outer walls at the left and right ends of the inner ring, a third thread groove opposite to the first thread groove is formed on the inner wall of the left outer ring, and a fourth thread groove opposite to the second thread groove is formed on the inner wall of the right outer ring; a fifth thread groove and a sixth thread groove with opposite thread rotation directions are respectively formed on the outer walls at the left and right ends of the planetary rollers, wherein the fifth thread groove on the planetary rollers is respectively screwed with the first thread groove of the inner ring and the third thread groove of the left outer ring, and the sixth thread groove is respectively screwed with the second thread groove of the inner ring and the fourth thread groove of the right outer ring;

[0005] An annular sealing retainer is clamped between the two ends of the outer ring and the inner ring, and a plurality of circular positioning recessed holes are formed on the inner end surface of the sealing retainer; circular positioning bosses are formed at both ends of the planetary roller, and the positioning bosses at both ends of the planetary roller are respectively inserted into the positioning recessed holes of the sealing retainer.

[0006] Preferably, the central axis of the inner ring, the central axis of the left outer ring, the central axis of the right outer ring and the central axis of the seal retainer coincide with each other, and the planetary rollers are evenly distributed in a ring shape around the central axis of the inner ring.

[0007] Preferably, the thread helix angles of the first thread groove, the second thread groove, the third thread groove, the fourth thread groove, the fifth thread groove and the sixth thread groove are all equal.

[0008] Preferably, an annular middle groove is formed between the first thread groove and the second thread groove of the inner ring, and an annular groove opposite to the middle groove is formed between the fifth thread groove and the sixth thread groove of the planetary roller; the spacer is located on the outside of the middle groove, and the rolling body generates a preload by adjusting the height of the spacer, and the size of the preload can be adjusted by slightly adjusting the height of the spacer.

[0009] Preferably, an annular left groove is formed on the inner wall of the left end of the left outer ring, and an annular right groove is formed on the inner wall of the right end of the right outer ring; the outer ring of the sealing retainer is respectively clamped in the left groove of the left outer ring and the right groove of the right outer ring;

[0010] Annular step grooves are formed on the outer walls of the two end portions of the inner ring, and the inner ring of the sealing retainer abuts against the step surfaces of the step grooves.

[0011] Preferably, a left limit stop ring is formed on the right end surface of the left end outer ring, and a right limit stop ring is formed on the left end surface of the right end outer ring, and the inner wall of the spacer sleeve abuts against the outer walls of the left limit stop ring and the right limit stop ring respectively.

[0012] The beneficial effects of the utility model are:

[0013] The rollers of the planetary roller bearing are provided with left and right threads with opposite rotation directions between the inner and outer rings of the bearing. At the same time, the helix angle of each thread section is equal, the adjacent threads have opposite rotation directions, and can be screwed and rotated with each other. The structure is ingenious and simple. Based on the thread groove design, an equivalent rolling body spherical radius is formed that is larger than that of a ball bearing of the same size, giving it the advantages of high load-bearing and long life, thereby providing a more effective and reliable solution for heavy-load and long-life application scenarios. Description of the drawings:

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 This is a half-section structural schematic diagram of the utility model;

[0016] Figure 3 This is a schematic diagram of the partial three-dimensional structure of the utility model after removing the outer ring;

[0017] Figure 4 This is a schematic diagram of the structure of the inner thread of the outer ring of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the outer thread of the planetary ball of the utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the outer thread of the inner ferrule of the utility model;

[0020] Figure 7 This is a comparison chart of dynamic loads for angular contact ball bearings and planetary roller bearings of the same size;

[0021] Figure 8 It is a schematic diagram of the arc of the channel thread modified by the utility model;

[0022] Fig. 9 The following is a comparison chart of dynamic loads of planetary roller bearings at different heights;

[0023] Fig.10 It is a schematic diagram of a three-dimensional structure of a double-row angular contact ball bearing in partial section;

[0024] Fig.11 It is a schematic diagram of the three-dimensional structure of a conventional planetary roller bearing in partial section;

[0025] Fig.12 It is a schematic diagram of a three-dimensional structure of a partial cross-section of a four-row angular contact ball bearing;

[0026] Fig.13 It is a schematic diagram of the three-dimensional structure of a partial cross-section of an extended planetary roller bearing.

[0027] In the figure: 1, inner ring; 11, first threaded groove; 12, second threaded groove; 13, step groove; 2, planetary roller; 21, fifth threaded groove; 22, sixth threaded groove; 23, positioning boss; 3, left outer ring; 31, third threaded groove; 32, left retaining groove; 33, left limit retaining ring; 4, right outer ring; 41, fourth threaded groove; 42, right retaining groove; 43, right limit retaining ring; 5, nut; 51, positioning recessed hole; 52, limit retaining hole; 6, spacer. Specific implementation method:

[0028] Example: See Figures 1 to 3As shown, the herringbone planetary roller bearing comprises an outer ring, an inner ring 1 and a plurality of planetary rollers 2, the planetary rollers 2 are inserted between the inner ring 1 and the outer ring, the outer ring is composed of a left outer ring 3, a right outer ring 4 and a spacer 6, the spacer 6 is clamped between the left outer ring 3 and the right outer ring 4; the outer walls at the left and right ends of the inner ring 1 are formed with a first thread groove 11 and a second thread groove 12 with opposite thread rotation directions, the first thread groove 11 and the second thread groove 12 form a "herringbone" shaped inner groove structure, the inner wall of the left outer ring 3 is formed with a third thread groove 31 opposite to the first thread groove 11, and the inner wall of the right outer ring 4 is formed with a fourth thread groove 41 opposite to the second thread groove 12; the outer walls at the left and right ends of the planetary rollers 2 are respectively formed with a fifth thread groove 21 and a sixth thread groove 22 with opposite thread rotation directions, the first thread groove 11 and the second thread groove 12 form a "herringbone" shaped inner groove structure, the third thread groove 31 opposite to the first thread groove 11 is formed on the inner wall of the left outer ring 3, and the fourth thread groove 41 opposite to the second thread groove 12 is formed on the inner wall of the right outer ring 4; the fifth thread groove 21 and the sixth thread groove 22 with opposite thread rotation directions are formed on the outer walls at the left and right ends of the planetary rollers 2, respectively. The fifth thread groove 21 and the sixth thread groove 22 form an outer groove structure of a "human" shape and match the inner groove; the fifth thread groove 21 on the planetary roller 2 is respectively screwed with the first thread groove 11 of the inner ring 1 and the third thread groove 31 of the left outer ring 3, and the sixth thread groove 22 is respectively screwed with the second thread groove 12 of the inner ring 1 and the fourth thread groove 41 of the right outer ring 4; that is, the first thread groove 11 on the inner ring 1 and the third thread groove 31 on the left outer ring 3 have the same rotation direction; the second thread groove 12 on the inner ring 1 and the fourth thread groove 41 on the right outer ring 4 have the same rotation direction; the fifth thread groove 21 on the planetary roller 2 has an opposite rotation direction to the first thread groove 11 and the third thread groove 31; the sixth thread groove 22 on the planetary roller 2 has an opposite rotation direction to the second thread groove 12 and the fourth thread groove 41, see Figure 4 , 5 , as shown in 6;

[0029] An annular sealing retainer 5 is clamped between the two ends of the outer ring and the inner ring 1, and a plurality of circular positioning recessed holes 51 are formed on the inner end surface of the sealing retainer 5; circular positioning bosses 23 are formed at both ends of the planetary roller 2, and the positioning bosses 23 at both ends of the planetary roller 2 are respectively inserted into the positioning recessed holes 51 of the sealing retainer 5.

[0030] The central axis of the inner ring 1 , the central axis of the left outer ring 3 , the central axis of the right outer ring 4 and the central axis of the seal holder 5 coincide with each other, and the planetary rollers 2 are evenly distributed in a ring shape around the central axis of the inner ring 1 .

[0031] The thread helix angles of the first thread groove 11, the second thread groove 12, the third thread groove 31, the fourth thread groove 41, the fifth thread groove 21 and the sixth thread groove 22 are all equal, so as to ensure that the planetary roller 2 realizes rotation while performing circumferential fixed revolution around the central axis of the inner ring 1, and ensure that the planetary roller 2 revolves around the left outer ring 3 and the right outer ring 4 while the left outer ring 3 and the right outer ring 4 are circumferentially and axially fixed. The structure is ingenious and simple, and the thread groove design has the advantages of high load-bearing capacity and long life.

[0032] An annular middle groove a is formed between the first thread groove 11 and the second thread groove 12 of the inner ring 1, and an annular groove b opposite to the middle groove a is formed between the fifth thread groove 21 and the sixth thread groove 22 of the planetary roller 2; the spacer 6 is located outside the middle groove a, and the width of the middle groove a is equal to the length of the spacer 6.

[0033] An annular left clamping groove 32 is formed on the inner wall of the left end of the left outer ring 3, and an annular right clamping groove 42 is formed on the inner wall of the right end of the right outer ring 4; the outer ring of the sealing retainer 5 is respectively clamped in the left clamping groove 32 of the left outer ring 3 and the right clamping groove 42 of the right outer ring 4;

[0034] Annular step grooves 13 are formed on the outer walls of both ends of the inner ferrule 1, and the inner ring of the sealing retainer 5 abuts against the step surface of the step groove 13; a plurality of limit clamping holes 52 are formed on the outer end surface of the retainer 5;

[0035] A left limit retaining ring 33 is formed on the right end face of the left end outer ring 3, and a right limit retaining ring 43 is formed on the left end face of the right end outer ring 4. The inner wall of the spacer sleeve 6 respectively abuts against the outer wall of the left limit retaining ring 33 and the right limit retaining ring 43, and the radial limitation of the spacer sleeve 6 is achieved based on the left limit retaining ring 33 and the right limit retaining ring 43.

[0036] Working principle: the helix angles of the threads of the inner ring 1, the planetary roller 2, the left outer ring 3 and the right outer ring 4 of the present invention are equal, the planetary roller 2 and the inner ring 1 both have two sections of opposite thread grooves designed in a herringbone structure, and the two sections of the threads of the inner ring 1 and the planetary roller 2 are reversely screwed together, and at the same time, the two sections of the threads of the planetary roller 2 are reversely screwed together with the thread grooves on the left outer ring 3 and the right outer ring 4, respectively, to ensure that a number of planetary rollers 2 can realize self-rotation while revolving around the inner ring 1 in the circumferential direction, the inner ring 1 rotates in the circumferential direction, and ensure that a number of planetary rollers 2 revolve around the left outer ring 3 and the right outer ring 4 while the left outer ring 3 and the right outer ring 4 are fixed in the circumferential and axial directions. The structure is ingenious and simple, based on the thread groove design, a spherical radius of the equivalent rolling body is formed that is larger than that of a ball bearing of the same size, thereby giving it the advantages of high load-bearing capacity and long life;

[0037] A sealing retainer 5 is also provided, which can realize the axial positioning of the planetary rollers 2 and the spacing between the planetary rollers 2, and can also ensure that the axes of the planetary rollers 2, the inner ring 1, the left outer ring 3 and the right outer ring 4 are kept parallel to achieve the best performance;

[0038] The left outer ring 3 and the right outer ring 4 are separated by a spacer sleeve 6 to add preload and adjust the gap. The structure is simple and eliminates the need for matching or grinding spacers to apply preload in traditional angular contact bearings. Moreover, the left outer ring 3 and the right outer ring 4 can be installed to the outside of the planetary roller 2 from the left and right ends of the inner ring 1 through rotation, respectively, and the installation is simple and convenient.

[0039] Taking angular contact ball bearing 7202 as an example, the theoretical dimensions and dynamic loads are compared as follows. See the attached figure for the comparison chart. Figure 7 ;

[0040] The geometric design and mechanical design have high freedom, and the arc of the groove thread can be modified under the same size. See the attached figure Figure 8 , planetary roller bearings of different heights can increase the load-bearing capacity, see attached figure Fig. 9 ;

[0041] In addition, there is also an integrated bearing matching scheme, which does not require the height difference of the inner and outer rings of the bearings, the inner and outer diameter tolerances, etc., and does not require the preload adjustment like grinding a spacer between two angular contact ball bearings. In addition, with a high degree of freedom design, the planetary roller can be lengthened to adapt to the use of multiple pairs of pairs. For example, when comparing double-row back-to-back angular contact ball bearings with planetary roller bearings, the structure of the double-row back-to-back angular contact ball bearing is as follows: Fig.10 As shown, the structure of the planetary roller bearing is as follows Fig.11 As shown in the figure; For example, the structure of the four-row angular contact ball bearing is compared with the extended planetary roller bearing. Fig.12 As shown, the structure of the extended planetary roller bearing is as follows Fig.13 shown.

[0042] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A herringbone planetary roller bearing, comprising an outer ring, an inner ring (1) and a plurality of planetary rollers (2), wherein the planetary rollers (2) are inserted between the inner ring (1) and the outer ring, and the outer ring is composed of a left outer ring (3), a right outer ring (4) and a spacer (6), wherein the spacer (6) is clamped between the left outer ring (3) and the right outer ring (4); characterized in that: A first thread groove (11) and a second thread groove (12) with opposite thread rotation directions are formed on the outer walls of the left and right ends of the inner ring (1), a third thread groove (31) opposite to the first thread groove (11) is formed on the inner wall of the left outer ring (3), and a fourth thread groove (41) opposite to the second thread groove (12) is formed on the inner wall of the right outer ring (4); a fifth thread groove (21) and a sixth thread groove (22) with opposite thread rotation directions are respectively formed on the outer walls of the left and right ends of the planetary roller (2), the fifth thread groove (21) on the planetary roller (2) is respectively screwed with the first thread groove (11) of the inner ring (1) and the third thread groove (31) of the left outer ring (3), and the sixth thread groove (22) is respectively screwed with the second thread groove (12) of the inner ring (1) and the fourth thread groove (41) of the right outer ring (4); An annular sealing retainer (5) is respectively sandwiched between the two ends of the outer ring and the inner ring (1), and a plurality of circular positioning recessed holes (51) are formed on the inner end surface of the sealing retainer (5); circular positioning bosses (23) are respectively formed at the two ends of the planetary roller (2), and the positioning bosses (23) at the two ends of the planetary roller (2) are respectively inserted into the positioning recessed holes (51) of the sealing retainer (5).

2. The herringbone planetary roller bearing according to claim 1, characterized in that: The central axis of the inner ring (1), the central axis of the left outer ring (3), the central axis of the right outer ring (4) and the central axis of the sealing retainer (5) coincide with each other, and the planetary rollers (2) are evenly distributed in a ring shape around the central axis of the inner ring (1).

3. The herringbone planetary roller bearing according to claim 1, characterized in that: The thread helix angles of the first thread channel (11), the second thread channel (12), the third thread channel (31), the fourth thread channel (41), the fifth thread channel (21) and the sixth thread channel (22) are all equal.

4. The herringbone planetary roller bearing according to claim 2, characterized in that: An annular intermediate groove (a) is formed between the first thread groove (11) and the second thread groove (12) of the inner ring (1), and an annular groove (b) facing the intermediate groove (a) is formed between the fifth thread groove (21) and the sixth thread groove (22) of the planetary roller (2); the spacer (6) is located outside the intermediate groove (a).

5. The herringbone planetary roller bearing according to claim 2, characterized in that: An annular left clamping groove (32) is formed on the inner wall of the left end of the left outer ring (3), and an annular right clamping groove (42) is formed on the inner wall of the right end of the right outer ring (4); the outer ring of the sealing retainer (5) is respectively clamped in the left clamping groove (32) of the left outer ring (3) and the right clamping groove (42) of the right outer ring (4); Annular step grooves (13) are formed on the outer walls of the two end portions of the inner ferrule (1), and the inner ring of the sealing retainer (5) abuts against the step surfaces of the step grooves (13).

6. The herringbone planetary roller bearing according to claim 5, characterized in that: A left limit stop ring (33) is formed on the right end surface of the left end outer ring (3), and a right limit stop ring (43) is formed on the left end surface of the right end outer ring (4). The inner wall of the spacer (6) abuts against the outer walls of the left limit stop ring (33) and the right limit stop ring (43), respectively.

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