CN218294201U - Planetary roller bearing - Google Patents
Planetary roller bearing Download PDFInfo
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- CN218294201U CN218294201U CN202222733753.6U CN202222733753U CN218294201U CN 218294201 U CN218294201 U CN 218294201U CN 202222733753 U CN202222733753 U CN 202222733753U CN 218294201 U CN218294201 U CN 218294201U
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- 239000000969 carrier Substances 0.000 claims description 11
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a planet roller bearing, include: a bearing inner race having an axial through bore; the outer wall of the bearing inner ring is provided with a bearing external thread with a zero helix angle, and the two axial ends of the bearing external thread are respectively provided with an annular tooth part and a bearing outer ring which is sleeved outside the bearing inner ring; the inner wall of the bearing outer ring is provided with a bearing inner thread with a zero helix angle; at least two rollers arranged radially between the bearing inner ring and the bearing outer ring with respect to a central axis of the bearing inner ring; the outer surface of each roller is provided with a roller thread which has a zero lead angle and is suitable for being matched with the bearing external thread and the bearing internal thread simultaneously; and the two axial ends of the roller threads are respectively provided with a tooth part which is used for meshing and matching with the annular tooth part. The utility model discloses can improve the stability of the roller running state among the roller planetary bearing.
Description
Technical Field
The utility model relates to a bearing technical field especially relates to a planet roller bearing.
Background
The planetary roller bearing is a structural form of the planetary roller screw which only performs rotary motion and does not output axial displacement. The planetary gear mechanism composed of the roller gear, the screw rod end gear and the inner gear ring replaces a retainer, the roller moves according to the design requirement, the function of the bearing is realized, and the planetary gear mechanism has wide application prospect in the fields of space equipment, military equipment and the like which have strict requirements on rigidity, service life, bearing capacity and impact resistance.
In this regard, publication No. CN 108302118A discloses a threaded roller planetary bearing, which includes: the device comprises a bearing inner ring, a bearing outer ring, a plurality of rollers and two planet carriers; the thread pitch of the threads on the roller is the same as that of the threads on the outer wall of the bearing inner ring and the inner wall of the bearing outer ring so as to realize meshing; the bearing inner ring is nested in the bearing outer ring, the two planetary carriers are respectively positioned at two ends of an annular space formed by nesting the bearing inner ring and the bearing outer ring, and the optical axis steps at two ends of the roller are inserted into the unthreaded holes of the planetary carriers, so that a plurality of mutually parallel rollers rotate in the annular space. The threaded roller planetary bearing has the characteristics of high rotating speed and capability of bearing axial load and radial load, but in the operation process of the integral roller, the conditions of swinging, offsetting and sliding in a tiny range are difficult to avoid, and the swinging, offsetting and sliding of the roller can influence the operation stability of the roller planetary bearing.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a planet roller bearing to solve the technical problem who improves the stability of roller running state among the roller planet bearing.
The utility model discloses a planet roller bearing realizes like this:
a planetary roller bearing comprising: a bearing inner race having an axial through bore; the outer wall of the bearing inner ring is formed with a bearing external thread with a zero helix angle, and two annular tooth parts are respectively arranged at two axial ends of the bearing external thread,
the bearing outer ring is sleeved on the outer side of the bearing inner ring; the inner wall of the bearing outer ring is provided with a bearing inner thread with a zero helix angle;
at least two rollers arranged radially between the bearing inner ring and the bearing outer ring with respect to a central axis of the bearing inner ring; the outer surface of each roller is formed with roller threads with a zero lead angle and suitable for being matched with the bearing external threads and the bearing internal threads simultaneously; and tooth parts which are engaged with the annular tooth parts are respectively arranged at the two axial ends of the roller threads.
In an alternative embodiment of the present invention, the ring gear is not connected to the shaft end of the adjacent bearing external thread, so that an axial distance exists between the ring gear and the bearing external thread.
In an alternative embodiment of the invention, the tooth portion is not connected to the shaft end of the adjacent roller thread such that there is an axial distance between the tooth portion and the roller thread.
In an alternative embodiment of the present invention, the ring-shaped tooth portion is connected to the shaft end of the adjacent bearing external thread in a straight-line manner.
In an alternative embodiment of the invention, the tooth portion is connected to the shaft end of the roller thread in a straight-forward manner.
In an alternative embodiment of the present invention, the planetary roller bearing further includes a pair of planetary carriers respectively provided with axial ends of at least two rollers; and
the pair of planet carriers are sleeved on the outer side of the bearing inner ring.
In an optional embodiment of the present invention, the planet carrier is provided with an assembling hole for assembling the roller; and
and the two shaft ends of each roller are respectively provided with an inserting part with the inner diameter smaller than that of the tooth part and used for being inserted into the assembling hole.
In an optional embodiment of the present invention, a pair of mounting grooves is further concavely formed on an outer wall of the bearing inner ring; and
and the pair of mounting grooves are respectively suitable for being embedded into a snap ring which is suitable for being abutted with one end of the planet carrier, which is far away from the roller, one by one.
In an alternative embodiment of the present invention, the snap ring has a notch.
By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses a planet roller bearing, the cooperation through the tooth portion that is equipped with on the ring gear portion that is equipped with on bearing inner race and roller can prevent that the roller from appearing the phenomenon of biasing and swing and sliding when rotary motion between bearing inner race and bearing inner race to improve its running state's stability when realizing the high-speed operation of this planet roller bearing. Furthermore the utility model discloses with the structure of ring tooth portion direct forming at the bearing inner race, compare in addition in this planet roller bearing increase the condition that solitary ring gear cooperates the roller in addition, the utility model discloses not only can simplify holistic structure, can improve overall structure's precision moreover.
Drawings
Fig. 1 is a first perspective structural view of the planetary roller bearing of the present invention;
fig. 2 is a second perspective view of the planetary roller bearing of the present invention;
fig. 3 is a schematic view of a partial structure of the planetary roller bearing of the present invention.
In the figure: the bearing comprises a bearing inner ring 1, a bearing outer thread 11, an annular tooth part 12, a mounting groove 13, a bearing outer ring 2, a bearing inner thread 21, a roller 3, a roller thread 31, a tooth part 32, an insertion part 33, a clamping ring 4 and a planet carrier 5.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
Referring to fig. 1 to 3, the present embodiment provides a planetary roller bearing, including: a bearing inner ring 1, a bearing outer ring 2 and at least two rollers 3 located between the bearing inner ring 1 and the bearing outer ring 2, where the at least two rollers 3 are arranged between the bearing inner ring 1 and the bearing outer ring 2 in a radial direction with respect to a central axis of the bearing inner ring 1; in the present embodiment, the number of the rollers 3 may be 6 or more, and for the plurality of rollers 3, the rollers are uniformly spaced in the circumferential direction of the bearing inner ring 1.
More specifically, firstly, the bearing inner race 1 adopted in the present embodiment has an axial through hole; the outer wall of the bearing inner ring 1 is formed with a bearing outer thread 11 with a zero helix angle, and two axial ends of the bearing outer thread 11 are respectively provided with an annular tooth portion 12, where the axial section of the specific annular tooth portion 12 may be rectangular or other shapes, which is not limited in this embodiment.
Secondly, the bearing outer ring 2 is sleeved outside the bearing inner ring 1; a bearing inner thread 21 with a zero helix angle is formed on the inner wall of the bearing outer ring 2.
Finally, a roller 3, the structure of the plurality of rollers 3 employed in the present embodiment is the same, so that the structure of the roller 3 described below in the present embodiment corresponds to the case of any one roller 3, specifically, the outer surface of each roller 3 is formed with a roller thread 31 having a zero lead angle and adapted to simultaneously cooperate with the bearing external thread 11 and the bearing internal thread 21; and tooth portions 32 for meshing engagement with the ring-shaped tooth portions 12 are provided at both axial ends of the roller threads 31, respectively.
In addition to the above-described configuration, in an alternative embodiment, the ring gear 12 is not connected to the axial end of the adjacent bearing external thread 11, so that an axial distance exists between the ring gear 12 and the bearing external thread 11. Correspondingly, the tooth section 32 is not connected to the axial end of the adjacent roller thread 31 so that there is an axial spacing between the tooth section 32 and the roller thread 31. In a further alternative embodiment, the ring toothing 12 is connected directly to the shaft end of the adjacent bearing external thread 11. Correspondingly, the tooth portion 32 is in direct contact with the axial end of the roller thread 31. Both cases are satisfactory for use in the present embodiment, but it is of course also possible here that the ring toothing 12 is not connected to the shaft end of the bearing external thread 11, while the tooth flank 32 is connected to the roller thread 31; it is also possible that the ring-shaped tooth portion 12 is connected to the shaft end of the bearing external thread 11, and the tooth portion 32 is disconnected from the roller thread 31. The requirements of the present embodiment can be met by these conditions, that is, the tooth portion 32 on the roller 3 and the ring-shaped tooth portion 12 on the bearing inner ring 1 can be brought into meshing fit relationship to play a role in limiting the running state of the roller 3, so as to prevent the roller 3 from offsetting, swinging and sliding.
Finally, it should be noted that, in view of convenience of installation, the planetary roller bearing of the present embodiment further includes a pair of planetary carriers 5 respectively provided with two axial ends of the at least two rollers 3; and a pair of planet carriers 5 are sleeved outside the bearing inner ring 1. In more detail, the planet carrier 5 is provided with an assembling hole for assembling the roller 3; and an insertion portion 33 having an inner diameter smaller than that of the tooth portion 32 is formed at both axial ends of each roller 3 for insertion into the fitting hole. That is, the roller 3 and the carrier 5 can be engaged with each other simply by inserting them.
In addition, a pair of mounting grooves 13 are concavely arranged on the outer wall of the bearing inner ring 1; and a pair of mounting grooves 13 are respectively suitable for being embedded into the snap rings 4 which are suitable for being abutted against one end of the planet carrier 5, which is far away from the roller 3, one by one. Wherein, the snap ring 4 is provided with a gap. By adopting the structure, when the snap ring 4 of the embodiment limits the planet carrier 5 and the roller 3 at the outer side of the bearing inner ring 1, the anti-falling effect between the planet carrier 5 and the roller 3 is synchronously realized.
In summary, for the planetary roller bearing of the present embodiment, when the planetary roller bearing rotates, the bearing inner ring 1 is fixed, the bearing inner threads 21 on the inner wall of the bearing outer ring 2 cooperate with the roller threads 31 on the rollers 3 to generate friction, so as to drive the rollers 3 to rotate, and when the rollers 3 rotate, the threads on the rollers 3 cooperate with the bearing outer threads 11 on the bearing inner ring 1 to drive the rollers 3 and the planetary carriers 5 respectively provided at the two shaft ends thereof to rotate on the outer wall of the bearing inner ring 1 at the same time, so as to form the revolution of the rollers 3 and the pair of planetary carriers 5. In the process, the annular tooth part 12 arranged on the bearing inner ring 1 is matched with the tooth part 32 arranged on the roller 3, so that the roller 3 can be prevented from generating the phenomena of offset, swing and slippage when rotating between the bearing inner ring 1 and the bearing outer ring 2, and the stability of the running state of the planetary roller bearing is improved when the planetary roller bearing runs at high speed.
The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature being below, beneath or beneath a second feature includes the first feature being directly below and obliquely below the second feature or simply indicating that the first feature is at a lesser level than the second feature.
Claims (9)
1. A planetary roller bearing, comprising:
a bearing inner race having an axial through bore; the outer wall of the bearing inner ring is formed with a bearing external thread with a zero helix angle, and two annular tooth parts are respectively arranged at two axial ends of the bearing external thread,
the bearing outer ring is sleeved on the outer side of the bearing inner ring; the inner wall of the bearing outer ring is provided with a bearing inner thread with a zero helix angle;
at least two rollers arranged radially between the bearing inner ring and the bearing outer ring with respect to a central axis of the bearing inner ring; the outer surface of each roller is formed with roller threads with a zero lead angle and suitable for being matched with the bearing external threads and the bearing internal threads simultaneously; and tooth parts which are engaged with the annular tooth parts are respectively arranged at the two axial ends of the roller threads.
2. The planetary roller bearing of claim 1, wherein the ring gear is not connected to an axial end of an adjacent bearing external thread such that there is an axial spacing between the ring gear and the bearing external thread.
3. A planetary roller bearing according to claim 2, characterized in that the tooth sections are not connected to the axial ends of adjacent roller threads so that there is an axial distance between the tooth sections and the roller threads.
4. The planetary roller bearing of claim 1, wherein the ring-shaped teeth are in direct contact with the axial ends of adjacent bearing external threads.
5. An epicyclic roller bearing according to claim 4, wherein said tooth portions are coterminous with the axial ends of the roller threads.
6. An epicyclic roller bearing according to any of claims 1 to 5, further comprising a pair of planet carriers provided with axial ends of at least two rollers, respectively; and
the pair of planet carriers are sleeved on the outer side of the bearing inner ring.
7. The planetary roller bearing according to claim 6, wherein the carrier is provided with an assembly hole for assembling the roller; and
and the two shaft ends of each roller are respectively provided with an inserting part with the inner diameter smaller than that of the tooth part and used for being inserted into the assembling hole.
8. The planetary roller bearing of claim 7, wherein the outer wall of the inner race is further recessed with a pair of mounting grooves; and
and the pair of mounting grooves are respectively suitable for being embedded into one-to-one snap rings which are suitable for being abutted to one end of the planet carrier, which is far away from the roller.
9. A planetary roller bearing as claimed in claim 8 wherein the snap ring has a gap therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222733753.6U CN218294201U (en) | 2022-10-16 | 2022-10-16 | Planetary roller bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222733753.6U CN218294201U (en) | 2022-10-16 | 2022-10-16 | Planetary roller bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218294201U true CN218294201U (en) | 2023-01-13 |
Family
ID=84808406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222733753.6U Active CN218294201U (en) | 2022-10-16 | 2022-10-16 | Planetary roller bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218294201U (en) |
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2022
- 2022-10-16 CN CN202222733753.6U patent/CN218294201U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240126 Address after: 213000, No. 5 Jinjiang Road, Menghe Town, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Runfu Power Technology Co.,Ltd. Country or region after: China Address before: No. 217, Kaifa West Road, Hanjiang Economic Development Zone, Yangzhou City, Jiangsu Province, 225100 Patentee before: YANGZHOU CHVER TRANSMISSION TECHNOLOGY CO.,LTD. Country or region before: China |
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| TR01 | Transfer of patent right |