Integrated herringbone planetary roller bearing

Abstract

The utility model discloses an integrated herringbone planetary roller bearing which comprises a left half outer ring, a right half outer ring, a plurality of rollers, an inner ring and a pair of brackets, wherein a first thread area is arranged on the inner side of the left half outer ring; a second thread area is arranged on the inner side of the right half outer ring; a third thread area and a fourth thread area are respectively arranged at two ends of the roller; a fifth thread area and a sixth thread area are arranged at the two ends of the inner ring respectively; the left half outer ring and the right half outer ring are arranged at the two ends of the pin rollers in a sleeving mode respectively and are in threaded connection with the pin rollers, and the pin rollers are arranged along the circumference of the inner ring. And the pair of brackets are respectively arranged in the left half outer ring and the right half outer ring and are respectively connected with the end parts of the pin rollers. According to the utility model, a double-row thrust roller bearing is replaced, an integrated design is adopted, and a herringbone structure is formed inside, so that the thrust roller bearing is not easy to move outwards; the assembly precision is high, the overall size is small, and the bearing capacity is large.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary roller bearings, and particularly relates to an integrated herringbone planetary roller bearing. Background Art

[0002] Planetary roller screws are widely used in high-end mechanical equipment due to their unique structure and excellent performance, including fields such as numerical control machine tools, ultra-precision instruments, weaponry, industrial robots, high-end medical equipment, and aerospace mechanisms. Compared with ball screws, planetary roller screws have more thread contact points, greatly improving the rated dynamic load and static load. The planetary roller screw bearing is a derivative product of the planetary roller screw. In the high-end mechanical field, under the same load-bearing capacity, the planetary roller screw bearing has a smaller volume.

[0003] The patent document with the publication number CN106763603A discloses a planetary roller screw bearing. In the utility model, the roller screws are evenly distributed around the circumference of the hollow screw rod. The convex arc-shaped external threads thereof are simultaneously meshed with the triangular internal threads of the nut and the triangular external threads of the hollow screw rod in a point contact manner. The gears at both ends of the roller screws and the end gears of the screw rod and the internal gear ring form a planetary gear mechanism. The thread helix directions, thread pitch diameters, and number of thread starts of the external threads of the hollow screw rod, the external threads of the rollers, and the internal threads of the nut need to satisfy certain relationships. When the nut is fixed and the hollow screw rod rotates, it pushes the roller screws to perform planetary motion without axial displacement, and the roller screws simultaneously transmit axial loads and radial loads. The planetary roller screw bearing described in the utility model has more contact points compared with angular contact ball bearings of the same size and is suitable for applications in occasions with high speed, large axial and radial loads.

[0004] In practical applications, when a double-row planetary roller screw bearing needs to be used, it is difficult to form a "herringbone" structure like a double-row thrust cylindrical roller bearing or a thrust tapered roller bearing. A pair of bearings with opposite helix directions of the external threads of the hollow screw rods (or the inner rings) needs to be used. However, during the assembly process, it is difficult to detect the helix direction, and the assembly of double-row bearings is difficult, and the assembly accuracy is also low in high-end equipment. Therefore, there is an urgent need to invent an integrated herringbone planetary roller bearing. Summary of the Invention

[0005] According to an embodiment of the utility model, there is provided an integrated herringbone planetary roller bearing, comprising:

[0006] A left half outer ring, with a first thread area provided on the inner side of the left half outer ring;

[0007] A right half outer ring, with a second thread area provided on the inner side of the right half outer ring;

[0008] The first thread area and the second thread area have opposite thread helix directions and the same thread lead angle;

[0009] A number of rollers, with a third thread area and a fourth thread area respectively arranged at both ends of each roller. The thread helix directions of the third thread area and the fourth thread area are opposite, and the thread lead angles are the same.

[0010] An inner ring, with a fifth thread area and a sixth thread area respectively arranged at both ends of the inner ring. The thread helix directions of the fifth thread area and the sixth thread area are opposite, and the thread lead angles are the same.

[0011] The left half outer ring and the right half outer ring are respectively sleeved at both ends of the number of rollers and are in threaded connection with the number of rollers. The number of rollers is arranged along the circumference of the inner ring.

[0012] A pair of brackets, which are respectively arranged in the left half outer ring and the right half outer ring and are respectively connected to the ends of the rollers.

[0013] Furthermore, a gap is arranged between the third thread area and the fourth thread area; a gap is arranged between the fifth thread area and the sixth thread area.

[0014] Furthermore, the threads in the third thread area correspond to the threads in the first thread area, and the thread helix directions of the two are the same and the thread lead angles are the same; the threads in the third thread area correspond to the threads in the fifth thread area, and the thread helix directions of the two are opposite and the thread lead angles are the same.

[0015] Furthermore, the threads in the fourth thread area correspond to the threads in the second thread area, and the thread helix directions of the two are the same and the thread lead angles are the same; the threads in the fourth thread area correspond to the threads in the sixth thread area, and the thread helix directions of the two are opposite and the thread lead angles are the same.

[0016] Furthermore, it further includes: a spacer ring, which is arranged between the left half outer ring and the right half outer ring.

[0017] Furthermore, it further includes: a pair of sealing rings, which are respectively arranged between the brackets and the left half outer ring or the right half outer ring.

[0018] Furthermore, an annular limiting part is arranged on the outer side of the bracket.

[0019] Furthermore, the number of rollers is 3 to 12.

[0020] According to the integrated herringbone planetary roller bearing of the embodiment of the present invention, it replaces the double-row thrust roller bearing. With an integrated design, a "herringbone" structure is formed inside, and it is not easy to move outward; it has high assembly accuracy, small overall volume, and large load-bearing capacity.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a perspective view according to an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 left view of;

[0024] Figure 3 is Figure 2 A - A sectional view of;

[0025] Figure 4 is Figure 3 enlarged view at B of;

[0026] Figure 5 Schematic diagram of an exploded view according to an embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of the structure of the roller meshing with the inner ring according to an embodiment of the present utility model. Detailed implementation manner

[0028] Hereinafter, with reference to the drawings, the preferred embodiments of the present utility model will be described in detail to further elaborate on the present utility model.

[0029] First, in combination with Figures 1 to 6 describe an integral herringbone planetary roller bearing according to an embodiment of the present utility model, which is used in high - end equipment such as medicine, aviation, and automation, and has a wide range of application scenarios.

[0030] As Figures 1 to 6 shown, the integral herringbone planetary roller bearing according to an embodiment of the present utility model includes:

[0031] Left half outer ring 1, with a first thread area 11 provided on the inner side of the left half outer ring 1;

[0032] Right half outer ring 2, with a second thread area 21 provided on the inner side of the right half outer ring 2;

[0033] The thread helix directions of the first thread area 11 and the second thread area 21 are opposite, and the thread lead angles are the same;

[0034] A plurality of rollers 3, with a third thread area 31 and a fourth thread area 32 provided at both ends of the roller 3 respectively, and the thread helix directions of the third thread area 31 and the fourth thread area 32 are opposite, and the thread lead angles are the same;

[0035] Inner ring 4, with a fifth thread area 41 and a sixth thread area 42 provided at both ends of the inner ring 4 respectively, and the thread helix directions of the fifth thread area 41 and the sixth thread area 42 are opposite, and the thread lead angles are the same;

[0036] The left half outer ring 1 and the right half outer ring 2 are respectively sleeved at both ends of a plurality of rollers 3 and are thread - connected to the plurality of rollers 3, and the plurality of rollers 3 are arranged along the circumference of the inner ring 4;

[0037] Threaded regions with opposite helix directions form a "herringbone" structure, causing the bearing to generate a pre-tightening force inward and making it not easy to move outward.

[0038] A pair of brackets 5 are respectively arranged in the left half outer ring 1 and the right half outer ring 2, and are respectively connected to the ends of the rollers 3.

[0039] Furthermore, as Figures 5 to 6 shown, in this embodiment, there is a gap between the third threaded region 31 and the fourth threaded region 32; there is a gap between the fifth threaded region 41 and the sixth threaded region 42.

[0040] Furthermore, as Figures 3 to 6 shown, in this embodiment, the threads in the third threaded region 31 correspond to the threads in the first threaded region 11, and the two have the same helix direction and the same lead angle; the threads in the third threaded region 31 correspond to the threads in the fifth threaded region 41, and the two have opposite helix directions and the same lead angle.

[0041] Furthermore, as Figures 3 to 6 shown, in this embodiment, the threads in the fourth threaded region 32 correspond to the threads in the second threaded region 21, and the two have the same helix direction and the same lead angle; the threads in the fourth threaded region 32 correspond to the threads in the sixth threaded region 42, and the two have opposite helix directions and the same lead angle.

[0042] Furthermore, as Figure 1 , 3 , 5 shown, in this embodiment, it further includes: a spacer ring 6, and the spacer ring 6 is arranged between the left half outer ring 1 and the right half outer ring 2.

[0043] Furthermore, as Figure 1 , 4 ~5 shown, in this embodiment, it further includes: a pair of sealing rings 7, and the pair of sealing rings 7 are respectively arranged between the brackets 5 and the left half outer ring 1 or the right half outer ring 2.

[0044] Furthermore, as Figures 4 to 5 shown, in this embodiment, an annular limiting portion 51 is arranged on the outer side of the bracket 5, and the annular limiting portion 51 is used to limit the radial position of the sealing ring 7.

[0045] Furthermore, the number of rollers 3 is 3 to 12; preferably, as Figure 5 shown, in this embodiment, the number of rollers 3 is 10.

[0046] Working principle: The rollers 3 are arranged along the circumferential direction of the inner ring 4 and are engaged with the inner ring 4; the left half outer ring 1 and the right half outer ring 2 are respectively sleeved at both ends of the rollers 3 and are engaged with the rollers 3. The spacer ring 6 is sleeved on the rollers 3 and is located between the third thread area 31 and the fourth thread area 32. The bracket 5 is used to support the rollers 3 and limit the axial displacement of the rollers 3. The sealing ring 7 is used to seal the outside of the bracket 5; the inner ring 4 is used to be sleeved on the rotating shaft to be installed. During operation, the inner ring 4 rotates, the left half outer ring 1 and the right half outer ring 2 do not rotate, and the rollers 3 rotate around their own axes. Since the thread helix directions of the third thread area 31 and the fourth thread area 32 on the rollers 3 are opposite, a "herringbone" structure is formed, generating a pre-tightening force in the opposite direction to prevent the axial movement of the bearing.

[0047] As described above, with reference to Figures 1 to 6 the one-piece herringbone planetary roller bearing according to the embodiment of the present invention has been described. It replaces the double-row thrust roller bearing, with an integrated design, a "herringbone" structure formed inside, and is not prone to outward movement; it has high assembly accuracy, a small overall volume, and a large load-bearing capacity.

[0048] It should be noted that in this specification, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0049] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. An integrated chevron planetary roller bearing, characterized in that, Comprising: A left half outer ring, with a first thread area provided on the inner side of the left half outer ring; A right half outer ring, with a second thread area provided on the inner side of the right half outer ring; The thread helix directions of the first thread area and the second thread area are opposite, and the thread lead angles are the same; A number of rollers, with a third thread area and a fourth thread area respectively provided at both ends of the roller, and the thread helix directions of the third thread area and the fourth thread area are opposite, and the thread lead angles are the same; An inner ring, with a fifth thread area and a sixth thread area respectively provided at both ends of the inner ring, and the thread helix directions of the fifth thread area and the sixth thread area are opposite, and the thread lead angles are the same; The left half outer ring and the right half outer ring are respectively sleeved at both ends of the number of rollers and are threadedly connected to the number of rollers, and the number of rollers is arranged along the circumference of the inner ring; A pair of brackets, which are respectively provided in the left half outer ring and the right half outer ring and are respectively connected to the ends of the rollers.

2. The one-piece chevron planetary roller bearing according to claim 1, wherein, A gap is provided between the third thread area and the fourth thread area; a gap is provided between the fifth thread area and the sixth thread area.

3. The integrated chevron planetary roller bearing according to claim 1, characterized in that, The threads in the third thread area correspond to the threads in the first thread area, and the two have the same thread helix direction and the same thread lead angle; the threads in the third thread area correspond to the threads in the fifth thread area, and the two have opposite thread helix directions and the same thread lead angle.

4. The one-piece chevron planetary roller bearing according to claim 1, wherein The threads in the fourth thread area correspond to the threads in the second thread area, and the two have the same thread helix direction and the same thread lead angle; the threads in the fourth thread area correspond to the threads in the sixth thread area, and the two have opposite thread helix directions and the same thread lead angle.

5. The one-piece chevron planetary roller bearing according to claim 1, wherein It further comprises: a spacer ring, which is provided between the left half outer ring and the right half outer ring.

6. The one-piece chevron-shaped planetary roller bearing according to claim 1, wherein, It further comprises: a pair of sealing rings, which are respectively provided between the bracket and the left half outer ring or the right half outer ring.

7. The one-piece chevron planetary roller bearing according to claim 6, wherein, An annular limiting portion is provided on the outer side of the bracket.

8. The integrated chevron planetary roller bearing according to claim 1, characterized in that, The number of the rollers is 3 to 12.

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