CN215370612U

CN215370612U - Double-row angular contact ball bearing capable of self-adjusting pretightening force

Info

Publication number: CN215370612U
Application number: CN202121656710.1U
Authority: CN
Inventors: 卢朝逊
Original assignee: Shanghai C&U Group Co Ltd; C&U Co Ltd
Current assignee: Shanghai C&U Group Co Ltd; C&U Co Ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-12-31
Anticipated expiration: 2031-07-20

Abstract

The utility model relates to the technical field of bearings, and particularly discloses a double-row angular contact ball bearing capable of automatically adjusting pretightening force, which comprises an outer ring, an inner ring, two rows of rolling bodies arranged between the outer ring and the inner ring, and two middle rings arranged between the outer ring and the two rows of rolling bodies, wherein a roller path for the rolling bodies to roll is arranged between the middle rings and the inner ring, the middle rings and the outer ring form interference fit, and the thermal expansion coefficient of the outer ring is greater than that of the middle rings and the inner ring. By adopting the structure, the double-row angular contact ball bearing can weaken the sliding friction heat generation phenomenon of the rolling body and reduce the pre-tightening degree during the high-speed operation of the bearing.

Description

Double-row angular contact ball bearing capable of self-adjusting pretightening force

Technical Field

The utility model relates to the technical field of bearings, in particular to a double-row angular contact ball bearing capable of self-adjusting pretightening force.

Background

At present, a double-row angular contact ball bearing is often used on a chuck shaft of a spinning machine and a chemical fiber high-speed spinning winding head, and the outer ring of the existing double-row angular contact ball bearing is streamline, has poor bearing stability, is easy to axially float and has larger vibration. When the double-row angular contact ball bearing on the high-speed spinning machine works, the bearing is easy to vibrate and heat due to high running speed (30000rpm), so that the bearing generates abnormal sound and fails in advance, and the bearing can be sintered and clamped in case of serious condition, so that the service life of the bearing is influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides the double-row angular contact ball bearing which can weaken the sliding friction heat generation phenomenon of the rolling bodies and reduce the pre-tightening degree during the high-speed operation of the bearing.

In order to achieve the purpose, the utility model adopts the technical scheme that: the double-row angular contact ball bearing capable of automatically adjusting the pretightening force comprises an outer ring, an inner ring, two rows of rolling bodies arranged between the outer ring and the inner ring, and two middle rings arranged between the outer ring and the two rows of rolling bodies, wherein a roller path for the rolling bodies to roll is arranged between the middle rings and the inner ring, the middle rings and the outer ring form interference fit, and the thermal expansion coefficient of the outer ring is greater than that of the middle rings and the inner ring.

According to the utility model, as a further arrangement, a groove with an L-shaped shaft section is arranged on the outer side surface of the outer ring, a plurality of annular notches are arranged on the bottom of the groove at intervals along the axial direction of the groove, the annular notches are aligned with the two middle rings, and an annular concave pit is also arranged on the bottom of the groove.

As a further arrangement of the present invention, a seal ring is disposed between the middle ring and the inner ring, an annular stepped groove is disposed on an inner side surface of the middle ring, an outer side of the seal ring abuts against the annular stepped groove, and an inner side of the seal ring abuts against an outer side surface of the inner ring.

As a further arrangement of the utility model, the folding corners of the annular step grooves are in inward concave arc transition connection.

As a further arrangement of the utility model, one end of the inner side surface of the outer ring is provided with an annular shoulder step which forms a limit fit with one of the middle rings, the other end of the inner side surface of the outer ring is provided with an annular groove, a clamping ring is arranged between the outer ring and the inner ring, the outer side of the clamping ring is embedded in the annular groove and forms a limit arrangement with the other middle ring, and the two middle rings are positioned between the clamping ring and the annular shoulder step.

As a further arrangement of the utility model, the contact surfaces of the outer ring and the middle ring are provided with annular depressions which are staggered with each other, the axial interface of the annular depressions is trapezoidal, and the larger side of the bottom surface faces the joint of the outer ring and the middle ring.

By adopting the technical scheme, the sliding friction heat generation phenomenon of the rolling body is weakened. By adopting a proper bearing structure, the two middle rings are in a compressed state, and pretightening force is generated in the bearing, so that the sliding friction between the rolling bodies and the roller path is weakened when the rolling bodies bear light load. The pre-tightening degree of the bearing during high-speed operation is reduced. When the bearing is in a high-speed running state, the heat generated inside the bearing is large, the temperature of the bearing is gradually reduced from inside to outside, and the expansion degree is different due to the fact that steel is unevenly heated. The bearing outer ring is made of steel with a high thermal expansion coefficient, and the inner ring and the middle ring are made of steel with a low thermal expansion coefficient. The bearing has the advantages that the expansion amount of the outer ring of the bearing is larger than that of the middle ring and the inner ring in the temperature rise process, so that the internal pretightening force of the bearing is reduced, and the internal heat of the bearing is reduced.

The utility model is further described below with reference to the accompanying drawings.

Drawings

FIG. 1 is a structural sectional view of an embodiment of the present invention.

Detailed Description

The specific embodiment of the utility model is shown in fig. 1, and the double-row angular contact ball bearing capable of self-adjusting pretightening force comprises an outer ring 1, an inner ring 2, two rows of rolling bodies 3 positioned between the outer ring 1 and the inner ring 2, and two middle rings 4 positioned between the outer ring 1 and the two rows of rolling bodies 3, wherein a raceway 31 for the rolling bodies 3 to roll is arranged between the middle rings 4 and the inner ring 2, the middle rings 4 and the outer ring 1 form interference fit, and the thermal expansion coefficient of the outer ring 1 is greater than that of the middle rings 4 and the inner ring 2.

Be provided with the recess 11 that the axial section is the L type on the lateral surface of above-mentioned outer lane 1, be provided with a plurality of annular gaps 111 along its axial interval distribution on the tank bottom of recess 11, annular gap 111 aligns the setting with two centre circles 4, still be provided with annular pit 112 on the tank bottom of recess 11. The arrangement of the groove 11, the annular gap 111 and the annular recess 112 provides sufficient space for expansion of the outer ring 1, and reduces the pretightening force.

A sealing ring 5 is arranged between the middle ring 4 and the inner ring 2, an annular step groove 41 is arranged on the inner side surface of the middle ring 4, the outer side of the sealing ring 5 is abutted against the annular step groove 41, and the inner side of the sealing ring 5 is abutted against the outer side surface of the inner ring 2. The axial interface of annular step groove 41 is the L type, and annular step groove 41 has radial face and axial face, and its radial face is located the inboard than the axial face, and the opening of annular step groove 41 is outwards promptly, and radial face and sealing washer 5 constitute spacing sealed cooperation, make things convenient for sealing washer 5 to install.

The break angle 411 of the annular step groove 41 is in concave arc transition connection. Because the outside of sealing washer 5 is interference fit with annular step groove 41, so the arc transitional coupling setting of indent can conveniently cooperate, makes the junction inseparabler, and this dog-ear 411 is the junction of radial face and axial face.

The one end of the medial surface of above-mentioned outer lane 1 is provided with and constitutes spacing complex annular shoulder rank 12 with one of them centre circle 4, the other end of the medial surface of outer lane 1 is provided with ring channel 13, be provided with rand 6 between outer lane 1 and the inner circle 2, the outside of this rand 6 is inlayed and is established constitute spacing setting with another centre circle 4 in ring channel 13, two centre circle 4 is located between rand 6 and the annular shoulder rank 12. The arrangement of the clamping ring 6 and the annular shoulder step 12 realizes the limit of the centering ring 4, and the structure is simple.

The contact surface of the outer ring 1 and the middle ring 4 is provided with

annular recesses

14 and 42 which are staggered with each other, the axial boundary surfaces of the

annular recesses

14 and 42 are trapezoidal, and the larger side of the bottom surface faces the joint of the outer ring 1 and the middle ring 4. The provision of the

annular recesses

14, 42 facilitates the mutual loosening of the outer ring 1 and the centre ring 4 when the outer ring 1 is expanded.

By adopting the technical scheme, the sliding friction heat generation phenomenon of the rolling body 3 is weakened. By adopting a proper bearing structure, the two middle rings 4 are in a compressed state, and pretightening force is generated in the bearing, so that the sliding friction between the rolling bodies 3 and the roller path 31 when bearing light load is weakened. The pre-tightening degree of the bearing during high-speed operation is reduced. When the bearing is in a high-speed running state, the heat generated inside the bearing is large, the temperature of the bearing is gradually reduced from inside to outside, and the expansion degree is different due to the fact that steel is unevenly heated. The bearing outer ring 1 is made of steel with a high thermal expansion coefficient, and the inner ring 2 and the middle ring 4 are made of steel with a low thermal expansion coefficient. The expansion amount of the outer ring 1 of the bearing is larger than that of the middle ring 4 and the inner ring 2 in the temperature rise process, so that the internal pretightening force of the bearing is reduced, and the internal heat of the bearing is reduced.

The bearing structure is composed of an outer ring 1 with high thermal expansion coefficient, two middle rings 4 and an inner ring 2 which are made of common materials, two retainers, two rows of rolling bodies 3, two sealing rings 5, a clamping ring 6 and grease. The outer side of the middle ring 4 is in interference fit with the outer ring 1, a certain reserved gap is reserved between the two middle rings 4 when the outer ring 1 is not installed, the gap between the two middle rings 4 is 'eaten' after the two middle rings 4 are pressed into the outer ring 1, and the bearing forms an initial pre-tightening state. After the bearing operates, the inner ring 1 and the outer ring 1 of the bearing have certain temperature difference, and the outer ring 1 has a 'loosening' effect on the middle ring 4 in the axial direction and the radial direction due to large thermal expansion coefficient, so that the pretightening force of the bearing is reduced, the friction heat generation inside the bearing is reduced, the abnormal temperature rise and even the blocking state of the bearing are avoided, the operating stability of the bearing is improved, the vibration and the temperature rise of the bearing are reduced, and the service life of the bearing is prolonged. The structure considers that the interior of the bearing needs larger pretightening force to improve the stability of operation in the initial operation stage; when the bearing ring runs at high speed, the nonuniformity of temperature rise in the bearing is relieved due to the different thermal expansion coefficients of the bearing ring. By adopting the bearing configuration structure, the comprehensive cost of a single bearing can be reduced by about 60 percent.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.

Claims

1. The utility model provides a but self-interacting pretightning force's double column angular contact ball bearing, includes outer lane, inner circle and is located two rows of rolling elements between outer lane and the inner circle, its characterized in that: the rolling bearing further comprises two middle rings positioned between the outer ring and the two rows of rolling bodies, a roller path for the rolling bodies to roll is arranged between the middle rings and the inner rings, the middle rings and the outer ring form interference fit, and the thermal expansion coefficient of the outer ring is larger than that of the middle rings and that of the inner rings.

2. The double-row angular contact ball bearing capable of self-adjusting preload according to claim 1, wherein: the outer ring is characterized in that a groove with an L-shaped shaft section is formed in the outer side face of the outer ring, a plurality of annular notches distributed at intervals along the axial direction of the groove are formed in the groove bottom of the groove, the annular notches are aligned with the two middle rings, and annular pits are further formed in the groove bottom of the groove.

3. The double-row angular contact ball bearing capable of self-adjusting preload as claimed in claim 1 or 2, wherein: a sealing ring is arranged between the middle ring and the inner ring, an annular step groove is formed in the inner side face of the middle ring, the outer side of the sealing ring abuts against the annular step groove, and the inner side of the sealing ring abuts against the outer side face of the inner ring.

4. The double-row angular contact ball bearing capable of self-adjusting preload according to claim 3, wherein: the folding angle of the annular step groove is in inwards concave arc transition connection.

5. The double-row angular contact ball bearing capable of self-adjusting preload as claimed in claim 1, 2 or 4, wherein: one end of the inner side surface of the outer ring is provided with an annular shoulder step which is in limit fit with one of the middle rings, the other end of the inner side surface of the outer ring is provided with an annular groove, a clamping ring is arranged between the outer ring and the inner ring, the outer side of the clamping ring is embedded in the annular groove and forms limit arrangement with the other middle ring, and the two middle rings are positioned between the clamping ring and the annular shoulder step.

6. The double-row angular contact ball bearing capable of self-adjusting preload as claimed in claim 1, 2 or 4, wherein: the contact surface of the outer ring and the middle ring is provided with annular depressions which are staggered with each other, the axial interface of the annular depressions is trapezoidal, and the side with the larger bottom surface faces the joint of the outer ring and the middle ring.