Pressure-regulating pre-tightening type paired bearing assembly

Abstract

A pressure-regulating pre-tightening type paired bearing assembly relates to the field of bearings and comprises two bearings which are assembled in pairs and bear constant pre-tightening force, and each bearing is provided with an inner ring and an outer ring; a space ring is additionally arranged between the two bearings and comprises an inner space ring positioned between the inner rings of the two bearings and an outer space ring positioned between the outer rings of the two bearings; the space rings are made of rigid materials, and grooves are formed in the space rings, so that the space rings can elastically deform in the axial direction of the space rings, and the space rings are used for elastically compensating pretightening force borne by the two bearings. According to the pressure-regulating pre-tightening type paired bearing assembly, the pre-tightening force of the whole shaft system can be elastically compensated, so that complex working conditions such as low-speed heavy load and high-speed light load can be covered, the operation is stable, and the service life is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a pressure-adjusting and pre-tightening paired bearing assembly. BACKGROUND

[0002] Common bearing pre-tightening methods include positioning pre-tightening and constant-pressure pre-tightening, both of which are constant pre-tightening.

[0003] The constant-pressure pre-tightening outer spacer ring adopts a spring or a butterfly spring. In the working process, the paired bearings will not be unloaded, but the pre-tightening force of the paired bearings will change. For example, if the external load increases, the pre-tightening force of the paired bearings will increase. When the shaft system is lengthened due to the external environment, the pre-tightening force will decrease. When the shaft system is shortened, the pre-tightening force will increase. Therefore, constant-pressure pre-tightening is mostly applied to occasions without external load and relatively stable working environment.

[0004] The positioning pre-tightening adopts a rigid spacer ring. The pre-tightening force changes (increases / decreases) due to the influence of working environment and external load. When the external load exceeds 3.5 times the pre-tightening force, all the load is borne by the loaded end bearing, and the other end bearing will be completely unloaded, thereby reducing the service life of the paired bearings.

[0005] Under complex working conditions, such as low-speed heavy load and high-speed light load, the conventional single constant pre-tightening method and pre-tightening force of the main shaft system of a high-speed machining center cannot meet the processing performance requirements. Therefore, we propose a pressure-adjusting and pre-tightening paired bearing assembly. SUMMARY

[0006] The purpose of the present application is to provide a pressure-adjusting and pre-tightening paired bearing assembly, which can elastically compensate the pre-tightening force of the entire shaft system, thereby covering complex working conditions such as low-speed heavy load and high-speed light load, and having stable operation and long service life.

[0007] The technical scheme adopted by the present application is as follows: a pressure-adjusting and pre-tightening paired bearing assembly, which comprises two bearings paired and configured and subjected to constant pre-tightening force, each bearing having an inner ring and an outer ring; A spacer ring is installed between the two bearings, the spacer ring comprising an inner spacer ring between the inner rings of the two bearings and an outer spacer ring between the outer rings of the two bearings; The spacer ring is made of rigid material, and a groove is formed on the spacer ring to allow the spacer ring to elastically deform along the axial direction, thereby elastically compensating the pre-tightening force of the two bearings.

[0008] As a preferred scheme, the groove is arranged along the circumference of the spacer ring.

[0009] As a preferred scheme, the spacer ring has an inner circular surface, an outer circular surface, and two end surfaces for abutting against the inner ring or the outer ring. The groove is arranged on the inner or outer surface of the spacer ring.

[0010] As a preferred solution, the grooves arranged on the inner spacer ring and the outer spacer ring are opposite or back-to-back.

[0011] As a preferred solution, the step groove is arranged on both end surfaces of the spacer ring, and the step groove penetrates the inner or outer surface of the spacer ring in one direction.

[0012] As a preferred solution, in the radial direction of the bearing, the groove bottom of the groove extends to the depth range of the step groove.

[0013] As a preferred solution, the two bearings are back-to-back or face-to-face.

[0014] As a preferred solution, in the radial direction of the bearing, the thickness of the spacer ring is equal to the thickness of the inner ring or the outer ring on both sides.

[0015] Compared with the prior art, the beneficial effects of the present application are: 1. Based on the rigidity analysis of the spacer ring, the groove structure is arranged on the spacer ring to reduce the rigidity of the spacer ring, so that the spacer ring has a certain elasticity, thereby replacing the rigid spacer ring. The elastic rigid spacer ring after slotting has a certain compensation effect on the pre-tightening force of the paired bearings, can realize the function of automatic adjustment of pre-tightening force (pressure regulating pre-tightening), is suitable for different working conditions, and is suitable for application occasions requiring different pre-tightening force; 2. By using the patent scheme, the working pre-tightening force of the paired bearings is completely the same whether there is an external load or not, and the working environment is unstable. The situation of incomplete unloading and complete unloading does not occur, which is beneficial to improve the service life of the paired bearings. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a partial cross-sectional view of the back-to-back assembly of the present application. Figure 2 It is a structural schematic view of the bearing. Figure 3 It is a partial cross-sectional view of the inner spacer ring in the present application. Figure 4 It is a size design schematic view of the inner spacer ring in the present application. Figure 5 It is a size design schematic view of the outer spacer ring in the present application.

[0018] Reference numerals: 100, first bearing, 101, first inner ring, 102, first outer ring; 200, second bearing, 201, second inner ring, 202, second outer ring; 300, inner spacer; 400, outer spacer; 500, inner circle; 600, outer cylindrical surface; 700, end face; 800, groove, 801, groove bottom; 900. Step groove. DETAILED DESCRIPTION

[0019] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0020] It should be noted that: unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons having 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 a quantity limitation, but indicate the existence of at least one; the words "first", "second" and "third" used herein shall not be regarded as a limitation on the order of components, but are only used to distinguish different components; the words "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.

[0021] In order to more clearly describe the specific structural composition of the pressure-regulated preloaded paired bearing assembly, Figures 1-5 Describe this embodiment: like Figures 1-3 As shown, a pressure-regulated preloaded paired bearing assembly includes two bearings (a first bearing 100 and a second bearing 200) that are paired and subjected to a constant preload force. The two bearings (100 and 200) are assembled back-to-back or face-to-face. Each bearing has an inner ring (a first inner ring 101 and a second inner ring 201), an outer ring (a first outer ring 102 and a second outer ring 202), rolling elements, and a cage. The spacer is installed between the two bearings, and the thickness of the spacer is equal to the thickness of the inner ring (101 or 201) or the outer ring (102 or 202) on both sides of the spacer in the radial direction of the bearing; each spacer includes an inner spacer 300 between the inner rings of the two bearings and an outer spacer 400 between the outer rings of the two bearings; the spacer is made of rigid material, and a groove 800 is formed on the spacer to allow the spacer to elastically deform in the axial direction of the spacer, thereby elastically compensating the pre-tightening force of the two bearings.

[0022] The inner spacer 300 and the outer spacer 400 have the same structure, each having an inner circular surface 500, an outer circular surface 600, and two end surfaces 700 for abutting against the inner ring or the outer ring; the groove 800 is formed on the inner circular surface 500 or the outer circular surface 600 of the spacer, and preferably, the directions of the grooves 800 formed on the inner spacer 300 and the outer spacer 400 are opposite or opposite.

[0023] The cross section of the groove 800 can be rectangular and arranged along the circumference of the spacer, which on the one hand ensures that the deformation degree of different positions in the circumferential direction of the spacer is consistent, and on the other hand facilitates the processing of the spacer.

[0024] Referring to Figure 3 , rectangular stepped grooves 900 are formed on the two end surfaces 700 of the spacer, and the rigidity of the spacer is reduced by forming the stepped grooves, thereby achieving adjustment of different pre-tightening forces; the stepped grooves 900 pass through the inner circular surface 500 or the outer circular surface 600 of the spacer in one direction (in the inner spacer 300 shown in Figure 3 and Figure 4 , the stepped grooves 900 pass through the inner circular surface 500, and in the outer spacer 400 shown in Figure 5 , the stepped grooves 900 pass through the outer circular surface 600). In the radial direction of the spacer (vertical in the shown orientation), the groove bottom 801 of the groove 800 extends to the depth range (between the groove opening and the groove bottom) of the stepped groove 900.

[0025] Referring to Figure 4 and Figure 5 , taking the 71911 bearing as an example, i.e., the first bearing 100 and the second bearing 200 both use the 71911 bearing, and the unit is mm. Among them, the outer diameter of the 71911 bearing outer ring is 80, and the inner diameter of the inner ring is 50; Figure 2 , the thickness of the bearing outer ring G = the thickness of the bearing inner ring F = 5, the inner ring rib diameter 50 + G = 55, and the outer ring rib diameter 80 - F = 75; Figure 4 and Figure 5 , the width of the inner spacer and the outer spacer is A = 6, and C + E = F = G = 5; Two sets of 71911 bearings are installed back to back, and the inner spacer ring 300 and the outer spacer ring 400 are assembled in the shafting. The outer ring of the bearing is locked by a screw, and the inner ring of the bearing is locked by a nut. The inner spacer ring 300 and the outer spacer ring 400 are slotted. According to the pre-tightening force of the 71911 bearing being 200N, the slot width B=2.5, the slot depth H=4, C=3.5, E=1.5, and D=5 are set. The slotted elastic spacer ring overcomes the shortcomings of single constant pre-tightening, can automatically adjust the pre-tightening force of the paired bearings, and meets the performance requirements of the shafting in various working conditions. Meanwhile, the paired bearings have a compensation effect, enhance the adaptability of the bearing working temperature change environment and the running condition, and improve the service life and reliability of the shafting and the main machine.

[0026] The parts not described in detail in the above embodiments are prior art.

[0027] It should be noted that although the present application has been described by the above embodiments, the present application can also have other various embodiments. Those skilled in the art can obviously make various corresponding changes and modifications to the present application without departing from the spirit and scope of the present application, but these changes and modifications should belong to the scope protected by the appended claims and their equivalents of the present application.

Claims

1. A pressure-regulated preloaded paired bearing assembly, comprising two bearings assembled in a pair and subjected to a constant preload, each bearing having an inner ring and an outer ring; Its characteristics are: A spacer is installed between the two bearings, wherein the spacer includes an inner spacer located between the inner rings of the two bearings and an outer spacer located between the outer rings of the two bearings; The spacers are all made of rigid materials and have grooves formed thereon so that the spacers can be elastically deformed along their axial directions for elastically compensating for the preload forces applied to the two bearings.

2. The pressure-regulated preloaded paired bearing assembly according to claim 1, characterized in that: The groove is arranged along the circumference of the spacer.

3. The pressure-regulated preloaded paired bearing assembly according to claim 1, characterized in that: The spacer has an inner circular surface, an outer circular surface and two end surfaces for abutting the inner ring or the outer ring; The groove is arranged on the inner circumference or the outer circumference of the spacer.

4. The pressure-regulated preloaded paired bearing assembly according to claim 3, characterized in that: The directions of the grooves on the inner spacer and the outer spacer are opposite or opposite.

5. The pressure-regulated preloaded paired bearing assembly according to claim 3, characterized in that: Step grooves are provided on both end surfaces of the spacer, and the step grooves penetrate the inner circumferential surface or the outer circumferential surface of the spacer in one direction.

6. The pressure-regulated preloaded paired bearing assembly according to claim 5, characterized in that: In the radial direction of the spacer, the bottom of the groove is within the depth range of the step groove.

7. The pressure-regulated preloaded paired bearing assembly according to claim 1, characterized in that: Two bearings are assembled back to back or face to face.

8. The pressure-regulated preloaded paired bearing assembly according to claim 1, characterized in that: In the radial direction of the bearing, the thickness of the spacer is equal to the thickness of the inner ring or outer ring on both sides of it.

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