Self-pretightening double-row angular contact ball bearing

Abstract

A self-pre-tightening double-row angular contact ball bearing comprises an inner ring, and two circumferential inner ring channels are formed in the outer circumferential surface of the inner ring; the two outer rings are arranged on the outer side of the inner ring in a back-to-back sleeving mode in the mode that the wide end faces are opposite, the inner circumferential face of each outer ring is provided with an outer ring channel in the circumferential direction of the outer ring, and the outer ring channel of each outer ring and one inner ring channel of the inner ring correspondingly form an annular channel for containing the spherical roller to roll; the two retainers are arranged between the inner ring and the outer ring, and the spherical rollers are separated and kept in the corresponding annular channels through pockets in the retainers; and the pre-tightening piece is assembled between the wide end surfaces of the two outer rings in an interference manner so as to support the two outer rings and provide pre-tightening force. The self-pre-tightening double-row angular contact ball bearing has pre-tightening force, high stability can be kept, and a pre-tightening structure does not need to be additionally arranged when the bearing is applied.

Description

Technical Field

[0001] The invention relates to the technical field of double-row angular contact ball bearings, in particular to a self-preloaded double-row angular contact ball bearing. Background Art

[0002] The design of double row angular contact ball bearings is basically the same as that of single row angular contact ball bearings, but they only take up less axial space. There are three installation forms for double row angular contact ball bearings: back-to-back, face-to-face and tandem arrangement.

[0003] Angular contact ball bearings assembled back to back can bear radial load, axial load and overturning moment load at the same time. Due to their high rigidity, high stability and strong torque resistance, they are widely used in aerospace, precision machine tool spindles, automobiles, railways and other fields. Their structural types can be roughly divided into three categories: double-row angular contact ball bearings with a single inner ring and a single outer ring, double-row angular contact ball bearings with double inner rings, and two single-row angular contact ball bearings assembled back to back. Among them, double-row angular contact ball bearings with a single inner ring and a single outer ring still have clearance after processing due to structural limitations, no self-preload and cannot apply preload force, and have low stability; double-row angular contact ball bearings with double inner rings and two single-row angular contact ball bearings assembled back to back need to set up additional preload structures when used, which will occupy the space of the host machine and increase the weight of the host machine. Summary of the invention

[0004] The purpose of the present invention is to provide a self-preloaded double-row angular contact ball bearing, which has its own preload force and can maintain high stability, and does not require an additional preload structure when the bearing is used.

[0005] The technical solution adopted by the present invention is: a self-preloaded double-row angular contact ball bearing, comprising: An inner ring, the outer peripheral surface of which is provided with two circumferential inner ring grooves; Two outer rings are sleeved back to back on the outer side of the inner ring with their wide end faces facing each other. An outer ring groove is arranged on the inner circumference of each outer ring along its circumference. The outer ring groove of each outer ring corresponds to one of the inner ring grooves of the inner ring to form a ring for accommodating the rolling of spherical rollers. Two cages are located between the inner ring and the outer ring, and the spherical rollers are separated and retained in the corresponding rings through the pockets on them; The preload piece is interference fitted between the wide end faces of the two outer rings to support the two outer rings and provide preload force.

[0006] As a preferred solution, the side of the outer ring axially away from the wide end face is a narrow end face, and the inner diameter of the same outer ring narrows from the narrow end face to the wide end face.

[0007] As a preferred solution, the preload member is in an annular shape as a whole, and has two abutting end faces which press the wide end faces of the outer rings on both sides in opposite directions in the axial direction.

[0008] As a preferred solution, the prestressing element is composed of two half rings.

[0009] As a preferred solution, an outer ring end face stop boss for limiting radial movement of the preload member is provided at a position of the outer ring wide end face close to its inner circumference.

[0010] As a preferred solution, an assembly slope facing the outer ring is provided at the junction of the end surface and the inner circumferential surface of the preload member.

[0011] As a preferred solution, an assembly slope facing the preload member is provided at the junction of the wide end surface and the inner circumferential surface of the outer ring.

[0012] As a preferred solution, on the same outer ring, one side of the outer ring groove close to the wide end face has a support portion for supporting and contacting with the spherical roller at the contact angle line to transmit the axial supporting force of the spherical roller toward the preload member.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The double outer ring, back-to-back structure is adopted, and the preloaded parts are inserted between the two rows of outer rings to eliminate the axial and radial clearance of the bearing and provide preload force for the bearing, which has high rigidity and strong stability.

[0014] 2. It can realize self-pretightening without adding additional pretightening devices. On the one hand, it is light in weight and saves space. On the other hand, its pretightening force has been determined at the factory, and the user does not need to perform tedious operations such as grinding and pairing.

[0015] 3. The preloaded part is composed of two half rings, which is convenient for installation and disassembly, and can stably fit with the gap between the two outer rings; the assembly slope of the half ring is conducive to the assembler to smoothly install it between the two outer rings.

[0016] 4. By selecting half-ring materials with appropriate stiffness, both high-rigidity positioning preload and strong-stability constant-pressure preload can be implemented.

[0017] 5. The stop bosses on the end faces of the two rows of outer rings can locate the radial position of the half rings to prevent eccentricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is an explosion schematic diagram of the present invention; Figure 3 It is a schematic diagram of an axial section of the present invention as a whole; Figure 4 for Figure 3 A is an enlarged schematic diagram; Figure 5 It is a side view of the half ring in the present invention.

[0020] Reference numerals: 1. Inner ring, 101, inner ring groove; 2. outer ring, 201, outer ring groove, 202, outer ring end face stop boss; 3. Spherical roller; 4. Cage; 5. Preload, 501, half ring. DETAILED DESCRIPTION

[0021] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0022] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by people with ordinary skills in the field to which the invention belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantity restrictions, but indicate the existence of at least one; the words "first", "second" and "third" used in this document shall not be regarded as restrictions on the order of components, but are only used to distinguish different components; words such as "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0023] In order to more clearly describe the specific structure of the self-preloaded double-row angular contact ball bearing, Figure 1-5 Describe this embodiment: like Figure 1 , Figure 2 and Figure 3 As shown, a self-preloaded double-row angular contact ball bearing comprises: An inner ring 1, whose outer peripheral surface is provided with two circumferential inner ring grooves 101; Two outer rings 2 are sleeved on the outer side of the inner ring 1 back to back with their wide end faces 204 facing each other. An outer ring groove 201 is arranged on the inner circumference of each outer ring 2 along its circumference. The outer ring groove 201 of each outer ring 2 corresponds to one of the inner ring grooves 101 of the inner ring 1 to form a ring for accommodating the rolling of the spherical rollers 3. Two retainers 4 are conventional retainers, with several spherical pockets evenly arranged along their circumference for accommodating and separating spherical rollers. Both retainers 4 are located between the inner ring 1 and the outer ring 2, and the pockets thereon separate and retain the spherical rollers 3 in the corresponding rings; The preload member 5 is interference-fitted between the wide end faces of the two outer rings 2 to support the two outer rings 2 and provide preload force. The double outer ring, back-to-back structure is adopted, and the preload member 5 is interference-fitted between the two rows of outer rings 2 to eliminate the axial and radial clearance of the bearing and provide preload force for the bearing, which has high rigidity and strong stability.

[0024] One side of the outer ring groove 201 close to the wide end face 204 has a support portion that is in contact with the spherical roller 3 at the contact angle line. The support portion is located between the preload member 5 and the spherical roller 3 on one side, and is used to transmit the axial support force of the spherical roller 3 toward the preload member 5.

[0025] See also Figure 3 In the above embodiment, the side of the outer ring 2 axially away from its wide end face 204 is the narrow end face 203, and the inner diameter of the same outer ring 2 narrows from the narrow end face 203 to the wide end face 204. When back-to-back, the two rows of spherical rollers 3 are located outside the wide end faces 204 of the two outer rings, and the contact angle line of the bearing (the dotted line shown in the figure) spreads along the direction of the rotation axis. The preload 5 is inserted into the two outer rings 2 with interference fit, so that the two outer rings 2 have a tendency to move away from each other, and the spherical rollers 3 on the outside can provide more support to the support part of the outer ring groove 201, so as to limit the two outer rings 2 from moving away from each other toward the two ends of the inner ring 1, and provide a stable preload force while ensuring the stability of the inner ring 1, the outer ring 2 and the spherical rollers 3.

[0026] See also Figure 2 The preload member 5 is composed of two half rings 501. The two half rings 501 are located between the two outer rings 1, forming a substantially complete circular ring coaxial with the outer ring 2. The axial thickness of the half ring 501 is slightly larger than the gap between the two rows of outer rings 2 before assembly, and is used to support the two rows of outer rings 2 after assembly and provide preload force.

[0027] See also Figure 4The semi-ring 501 can be made of high-rigidity material or low-rigidity material according to the actual situation. If a high-rigidity material is used, it can be used as a positioning preload, and if a low-rigidity material is used, it can be used as a constant-pressure preload. The semi-ring 501 is inserted between the two outer rings 2 after the inner ring 1, the outer ring 2, the spherical roller 3 and the retainer 4 are installed. Specifically, the preload member 5 is annular as a whole, and each semi-ring 501 has two abutting end faces 502 that squeeze the wide end faces of the outer rings 2 on both sides in opposite directions in the axial direction. After the preload member 5 is inserted between the two outer rings 2, the abutting end face 502 presses against the wide end face of the outer ring 2 on the corresponding side.

[0028] In the above embodiment, the outer ring 2 is provided with an outer ring end face stop boss 202 near its inner circumference at the wide end face thereof to limit the radial movement of the preload member 5. After the preload member 5 or the half ring 501 is inserted into the gap between the two outer rings 2, a part of the inner circumference is pressed on the outer ring end face stop boss 202 to achieve radial positioning of the half ring 501 and prevent eccentricity.

[0029] In the above embodiment, the junction between the end face and the inner circumference of the preload member 5 is provided with an assembly slope 503 facing the outer ring 2; the junction between the wide end face and the inner circumference of the outer ring 2 is provided with an assembly slope 205 facing the preload member 5. The provision of the assembly slope is conducive to the assembler to smoothly install it between the two outer rings.

[0030] The parts not described in detail in the above embodiments are prior art.

[0031] It should be noted that although the present invention is described by the above embodiments, the present invention may also have other various embodiments. Without departing from the spirit and scope of the present invention, it is obvious that those skilled in the art may make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope of protection of the appended claims of the present invention and their equivalents.

Claims

1. A self-preloaded double-row angular contact ball bearing, characterized in that: include: An inner ring (1) having an outer peripheral surface provided with two circumferential inner ring grooves (101); Two outer rings (2) are sleeved back-to-back on the outer side of the inner ring (1) with their wide end faces facing each other, an outer ring groove (201) is arranged on the inner circumferential surface of each outer ring (2) along its circumference, and the outer ring groove (201) of each outer ring (2) corresponds to one of the inner ring grooves (101) of the inner ring (1) to form a ring for accommodating the rolling of the spherical roller (3); Two cages (4) are located between the inner ring (1) and the outer ring (2), and separate and retain the spherical rollers (3) in corresponding rings through pockets on the cages; The preload member (5) is interference-fitted between the wide end faces of the two outer rings (2) to support the two outer rings (2) and provide a preload force.

2. A self-preloaded double-row angular contact ball bearing according to claim 1, characterized in that: The side of the outer ring (2) that is axially away from the wide end face thereof is a narrow end face, and the inner diameter of the same outer ring (2) narrows from the narrow end face toward the wide end face.

3. The self-preloaded double-row angular contact ball bearing according to claim 1, characterized in that: The preload member (5) is in the shape of a circular ring as a whole, and has two abutment end surfaces (502) that press the wide end surfaces of the outer rings (2) on both sides in opposite directions in the axial direction.

4. A self-preloaded double-row angular contact ball bearing according to claim 3, characterized in that: The preload element (5) consists of two half rings.

5. The self-preloaded double-row angular contact ball bearing according to claim 1, characterized in that: An outer ring end face stop boss (202) for limiting radial movement of the preload member (5) is axially extended from the wide end face of the outer ring (2) near its inner circumferential surface.

6. A self-preloaded double-row angular contact ball bearing according to claim 1, characterized in that: An assembly slope facing the outer ring (2) is provided at the junction of the end surface and the inner peripheral surface of the preload member (5).

7. A self-preloaded double-row angular contact ball bearing according to claim 6, characterized in that: An assembly slope facing the preload member (5) is provided at the junction of the wide end surface and the inner peripheral surface of the outer ring (2).

8. The self-preloaded double-row angular contact ball bearing according to claim 1, characterized in that: On the same outer ring (2), a side of the outer ring groove (201) close to the wide end surface (204) has a support portion for supporting and contacting the spherical roller (3) at the contact angle line to transmit the axial support force of the spherical roller (3) toward the preload member (5).

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