CN111396456B

CN111396456B - Rolling bearing and support structure

Info

Publication number: CN111396456B
Application number: CN201910001540.4A
Authority: CN
Inventors: 梁霄; 李琳; 周倩楠; 赵凌玲
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-01-02
Filing date: 2019-01-02
Publication date: 2021-07-13
Anticipated expiration: 2039-01-02
Also published as: CN111396456A

Abstract

The present invention relates to a rolling bearing, a support structure including the same, and a support method, wherein the rolling bearing includes the steps of: the ring body, the inner peripheral surface of the said ring body has circulating raceways, the said circulating raceway includes the first spiral raceway, second spiral raceway, the said first spiral raceway communicates with said second spiral raceway of initial end, and the end communicates too; and a plurality of rolling elements for directly supporting the shaft, provided to the circulating raceway; wherein the rolling bodies can roll circularly along the circulating raceway. The rolling bearing, the supporting structure and the supporting method have the advantage that the combined motion requirement of relative linear motion and rotary motion between two objects can be met.

Description

Rolling bearing and support structure

Technical Field

The invention belongs to the field of bearings, and particularly relates to a rolling bearing, a supporting structure and a supporting method for simultaneously realizing axial and rotary motion.

Background

The traditional mechanical transmission technology cannot be separated from a bearing. The massage eraser has different properties, and the bearings can be divided into two categories, namely rolling bearings and sliding bearings. Plain bearings are used to directly support the journal with the bearing shells, take the load and maintain the normal operating position of the shaft. Rolling bearings rely on the rolling of rolling elements to support and carry the load. The rolling bearing has the characteristics of small friction force, small mechanical power consumption in the power transmission process, high rotation precision, high revolution and good wear resistance; meanwhile, it has the advantages of long service life, simple and convenient maintenance and repair, and the like, so that rolling bearings are mostly adopted in various rotary bodies.

Rolling bearings are broadly defined as all forms of bearings that utilize the rolling of balls or rollers to transfer controlled motion of one object to a corresponding other object with minimal friction. Referring to fig. 1, the conventional rolling bearing includes an inner ring 100, an outer ring 200, rolling elements 300 radially interposed therebetween, and a cage 400. The inner race 100 functions to engage and rotate with the shaft; the outer ring 200 is matched with the bearing seat to play a supporting role; the rolling bodies 300 are uniformly distributed between the inner ring 100 and the outer ring 200 by means of the retainer 400, and the shape, size and number of the rolling bodies directly influence the service performance and service life of the rolling bearing; the cage 400 can uniformly distribute the rolling elements 300 and guide the rolling elements 300 to rotate for lubrication. Most rolling bearings are used to impart rotational motion to a shaft relative to some fixed structure, and some rolling bearings exist for translational motion, i.e., linear motion in a fixed direction relative to a stationary shaft. The traditional rolling bearing can not meet the combined motion requirements of relative linear motion and rotary motion between two objects.

Therefore, there is a need in the art for a bearing that meets the combined motion requirements for both relative linear and rotational motion between two objects.

Disclosure of Invention

An object of the present invention is to provide a rolling bearing.

It is an object of the present invention to provide a support structure.

It is an object of the present invention to provide a method of support.

According to one aspect of the invention, the rolling bearing comprises a ring body, wherein a circulating raceway is arranged on the inner circumferential surface of the ring body, the circulating raceway comprises a first spiral raceway and a second spiral raceway, the starting ends of the first spiral raceway and the second spiral raceway are communicated, and the tail ends of the first spiral raceway and the second spiral raceway are also communicated; and a plurality of rolling elements for directly supporting the shaft, provided to the circulating raceway; wherein the rolling bodies can roll circularly along the circulating raceway.

In an embodiment of the rolling bearing, the ring body includes a holder and an outer support ring, the outer support ring is provided with a groove, the holder is provided with an opening, and the holder is lined on an inner peripheral side of the outer support ring, so that the groove and the opening define the circulating raceway together.

In an embodiment of the rolling bearing, both axial ends of the inner circumferential surface of the outer support ring are respectively provided with a retainer ring to stop the retainer in the axial direction.

In an embodiment of the rolling bearing, a spiral spacer is disposed in the groove, the groove is divided into a first spiral groove and a second spiral groove by the spacer, the first spiral groove is communicated with the second spiral groove at the start end, and the second spiral groove is communicated at the end, the opening is overlapped on the groove, and the rolling element and the spacer disposed in the groove are exposed.

In an embodiment of the rolling bearing, the rolling elements are spherical.

In an embodiment of the rolling bearing, the curvature of the channel of the first or second helical raceway is 0.515 to 0.525 times the diameter of the rolling body.

In an embodiment of the rolling bearing, the bearing play of the rolling bearing is 0-0.2 mm.

A support structure according to an aspect of the present invention includes a shaft that is movable axially and rotationally; the rolling bearing according to any one of the above for supporting the shaft; and a bearing housing supporting the rolling bearing.

According to a supporting method of an aspect of the present invention, a rolling body is used to roll circularly along a spiral track on an outer circumferential surface of a shaft, and the shaft is directly supported by the rolling body to allow the shaft to perform axial and rotational movements.

In summary, the improvement effect of the present invention includes one of the following:

(1) the combined motion requirements of relative linear motion and rotary motion between two objects are met by adopting the spiral roller path and the rolling bodies which roll circularly;

(2) the outer support ring, the rolling body and the retainer are in an assembly form, so that the rolling bearing is convenient to install on the shaft.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments in conjunction with the accompanying drawings, it being noted that the drawings are given by way of example only and are not drawn to scale, and should not be taken as limiting the scope of the invention which is actually claimed, wherein:

fig. 1 is a schematic structural view of a rolling bearing of the related art.

Fig. 2 is a schematic structural view of an embodiment of the rolling bearing of the present invention.

Fig. 3 is a schematic cross-sectional structure view of the embodiment according to fig. 2.

Fig. 4 is a cross-sectional structural schematic view of another embodiment of the rolling bearing of the present invention.

The reference numbers in the drawings are as follows:

1 rolling bearing

2 Ring body

3 circulating raceway

31 first helical raceway

311 first spiral raceway start end

312 first helical raceway end

32 second helical raceway

321 beginning end of second spiral raceway

322 second helical raceway end

4 rolling element

5 holding rack

6 outer support ring

7 clamping ring

8 partition rib

91 first spiral groove

92 second spiral groove

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and do not limit the scope of the invention. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

Further, it is to be understood that the positional or orientational relationships indicated by the terms "front, rear, upper, lower, left, right", "transverse, vertical, horizontal" and "top, bottom" and the like are generally based on the positional or orientational relationships illustrated in the drawings and are provided for convenience in describing the invention and for simplicity in description, and that these terms are not intended to indicate and imply that the referenced devices or elements must be in a particular orientation or be constructed and operated in a particular orientation without departing from the scope of the invention. Also, this application uses specific language to describe embodiments of the application. The terms "inside" and "outside" refer to the inner and outer parts relative to the outline of each part itself, and the terms "first" and "second" are used to define the parts, and are used only for the convenience of distinguishing the corresponding parts, and the terms do not have any special meaning unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Meanwhile, in the axial direction of the axial ring body in the specification, the circumferential surface of one side of the ring body close to the axial line is an inner circumferential surface.

Referring to fig. 2 and 3, in an embodiment, in a practical supporting structure using the rolling bearing 1, a shaft capable of performing axial and rotational motions and a bearing seat for supporting the rolling bearing 1 are included. The rolling bearing 1 includes a ring body 2, a circulating raceway 3 is provided on an inner peripheral surface of the ring body 2, the circulating raceway 3 includes a first spiral raceway 31 and a second spiral raceway 32, starting ends of the first spiral raceway 31 and the second spiral raceway 32 are communicated with each other, and ends of the first spiral raceway 31 and the second spiral raceway 32 are also communicated with each other, that is, as shown in fig. 3, a starting end 311, an end 312, a starting end 321, an end 322 of the first spiral raceway 31, starting ends 311, 321 of the second spiral raceway 32 are communicated with each other, and ends 312, 322 of the two spiral raceways are communicated with each other, that is, trajectories thereof are spiral lines, and starting ends and ends of the two spiral raceways are communicated with each other, so that the rolling elements 4 for directly supporting a. It is understood that the number of the spiral raceways included in the circulating raceway is not limited to two as shown in fig. 2 and 3, and may be two or more spiral raceways, but the starting ends and the ending ends of adjacent spiral raceways in the plural spiral raceways must communicate with each other to ensure the rolling elements 4 to circulate in the circulating raceway 3. In an embodiment shown in fig. 2 and 3, the shaft itself supported at this time is equivalent to an inner ring of a conventional rolling bearing, and since the circulating raceway 3 is disposed on the inner circumferential surface of the ring body 2, the rolling elements 4 rolling in a circulating manner are supported by the ring body 2 in the radial direction, so that the rolling elements 4 can provide support for the shaft moving in rotation, and meanwhile, since the rolling elements 4 roll in a circulating manner along a spiral line in the first spiral raceway 31 and the second spiral raceway 32, the axial movement of the shaft can be supported at the same time, and finally, the rolling bearing 1 can support the shaft moving in a relative linear motion and a rotation motion. In particular, the shape of the rolling elements 4 may be spherical as shown in fig. 2 to 4, which is easy to machine and assemble and easier to roll in a helical raceway. Accordingly, the curvature of the groove of the first spiral raceway 31 or the second spiral raceway 32 may be 0.515 to 0.525 times the diameter of the spherical rolling element 4, so that the spherical rolling element can be easily fitted into the first spiral raceway 31 or the second spiral raceway 32, and the spiral raceway can support the rolling element more stably. It is to be understood that the shape of the rolling elements 4 is not limited to the spherical shape, and may be other shapes suitable for the circulating rolling in the circulating raceway 3. In particular, the bearing play of the rolling bearing 1 can be 0-0.2mm, so that the play is set, which is better suited for applications where transmission precision requirements are high.

With continued reference to fig. 3 and 4, an example of a specific structure of the ring body 2 may be that the ring body 2 includes a cage 5 and an outer support ring 6, the outer support ring 6 is provided with a groove, the cage 5 is provided with an opening, and the cage 5 lines the inner circumferential side of the outer support ring 6 such that the groove and the opening together define the endless raceway 3. The beneficial effect of adopting the retainer 5 and the outer support ring 6 to jointly limit the circulating raceway 3 is that the ring body 2 and the rolling body 3 are in an assembly form, so that the processing of the rolling bearing 1 is convenient, and the installation of the rolling bearing 1 on a shaft by an operator is convenient. Further, the ring body 2 may further include collars 7 respectively provided at both axial ends of an inner circumferential surface of the outer support ring 6 to stop the cage 5 in the axial direction to prevent it from axially bouncing along with the axially moving shaft.

Referring to fig. 2 to 4, a specific structure of the circulating raceway 3 may be exemplified by a spiral-shaped spacer 8 disposed in a groove of the circulating raceway 3, the spacer 8 dividing the groove into a first spiral groove 91 and a second spiral groove 92, the first spiral groove 91 communicating with a start end of the second spiral groove 92 and a tail end thereof, and the opening overlapping the groove to expose the rolling elements 4 disposed in the groove and the spacer 8. The beneficial effect that so sets up lies in for the rolling element 4 of different spiral raceways separates through separating muscle 8, supports rolling element 4 through separating muscle 8, makes rolling element 4 change in the circulation roll in circulation raceway 3.

As is apparent from the above description, the method of supporting a shaft that performs axial and rotational motions by using rolling elements 4 includes:

the rolling body 4 rolls circularly along a spiral track on the outer circumferential surface of the shaft, and the shaft is directly supported by the rolling body 4 to allow the shaft to do axial and rotary motion.

In summary, the advantageous effects of the rolling bearing, the supporting structure, and the supporting method using the above embodiments include one of the following:

Although the present invention has been disclosed in the above-mentioned embodiments, it is not intended to limit the present invention, and those skilled in the art may make variations and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. A rolling bearing, characterized by comprising:

the ring body, the inner peripheral surface of the said ring body has circulating raceways, the said circulating raceway includes the first spiral raceway, second spiral raceway, the said first spiral raceway communicates with said second spiral raceway of initial end, and the end communicates too; and

a plurality of rolling bodies for directly supporting the shaft, provided to the circulating raceway;

wherein the rolling bodies can roll circularly along the circulating raceway.

2. The rolling bearing according to claim 1, wherein the ring body includes a cage and an outer support ring, the outer support ring is provided with a groove, the cage is provided with an opening, and the cage lines an inner peripheral side of the outer support ring such that the groove and the opening together define the circulating raceway.

3. The rolling bearing according to claim 2, wherein collars are provided at both axial ends of an inner peripheral surface of the outer support ring, respectively, to stop the cage in an axial direction.

4. The rolling bearing according to claim 2, wherein a rib having a spiral shape is provided in the groove, the groove is divided into a first spiral groove and a second spiral groove by the rib, the first spiral groove communicates with the second spiral groove at the start end and the end, and the opening overlaps the groove to expose the rolling element and the rib provided in the groove.

5. Rolling bearing according to claim 1, characterized in that the rolling elements are spherical.

6. Rolling bearing according to claim 5, wherein the curvature of the channels of the first or second helical raceway is between 0.515 and 0.525 times the diameter of the rolling elements.

7. Rolling bearing according to claim 1, characterized in that the bearing play of the rolling bearing is 0-0.2 mm.

8. A support structure, comprising:

a shaft capable of axial and rotational movement;

a rolling bearing according to any one of claims 1 to 7 for supporting the shaft; and

and a bearing seat for supporting the rolling bearing.