Deep groove ball bearing

Abstract

A deep groove ball bearing has an outer ring, an inner ring, a ball disposed between the outer ring and the inner ring, and a cage holding the ball. The outer ring has an outer ring channel defining an outer ring channel radius, the ratio of the outer ring channel radius to the diameter of the balls defining a first ratio, and both edges of the outer ring channel in the axial direction define an outer ring channel limiting angle with respect to the center of a circle of an arc of the outer ring channel. The inner ring has an inner ring channel defining an inner ring channel radius, the ratio of the inner ring channel radius to the diameter of the ball defining a second ratio, and both edges of the inner ring channel in the axial direction define an inner ring channel limit angle with respect to the center of the arc of the inner ring channel. The range of the first proportion is 0.525-0.570, the range of the second proportion is 0.510-0.530, the range of the channel limiting angle of the outer ring is 66-97 degrees, and the range of the channel limiting angle of the inner ring is 72-99 degrees. Compared with the prior art, the deep groove ball bearing has the advantage that the friction torque is obviously reduced.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, and in particular to a deep groove ball bearing. Background Art

[0002] Bearings are used to support mechanical rotating bodies in mechanical equipment. Bearings convert the sliding friction between the rotating shaft and the shaft seat into rolling friction, thereby reducing friction losses.

[0003] Deep groove ball bearings are a type of bearing. Deep groove ball bearings generally include an outer ring, an inner ring, balls disposed between the outer ring and the inner ring, and a cage for retaining the balls. The outer ring and inner ring of the deep groove ball bearing have an outer ring groove and an inner ring groove, respectively. When the bearing is running, the ball moves in the space defined between the outer ring groove and the inner ring groove.

[0004] During the movement of the ball, the outer ring and inner ring of the bearing interact with the ball, including friction, so that the bearing is still subjected to a certain friction torque. In order to reduce friction, lubrication between the components can generally be performed by lubricating oil or grease. However, there is still a need for an improved bearing component structure to improve the existing lubrication effect. Summary of the invention

[0005] In view of the above problems, according to a first aspect of the present invention, a deep groove ball bearing is proposed, which comprises an outer ring, an inner ring, a ball arranged between the outer ring and the inner ring, and a retaining frame for retaining the ball, wherein the outer ring has an outer ring groove, the outer ring groove defines an outer ring groove radius, the ratio of the outer ring groove radius to the diameter of the ball defines a first ratio, two edges of the outer ring groove in the axial direction relative to the center of the arc of the outer ring groove define an outer ring groove limiting angle, and the inner ring has an inner ring groove. The inner ring channel defines an inner ring channel radius, the ratio of the inner ring channel radius to the diameter of the ball defines a second ratio, and the two edges of the inner ring channel in the axial direction relative to the center of the arc of the inner ring channel define an inner ring channel limiting angle, wherein the first ratio ranges from 0.525 to 0.570, the second ratio ranges from 0.510 to 0.530, the outer ring channel limiting angle ranges from 66° to 97°, and the inner ring channel limiting angle ranges from 72° to 99°.

[0006] The applicant has found that in the deep groove ball bearing according to the present invention, by jointly controlling the groove radius and the groove limit angle of the outer ring and the inner ring, the friction torque to which the bearing is subjected can be effectively reduced. In fact, according to the results of the test conducted by the applicant, the deep groove ball bearing of the present invention can significantly reduce the friction torque relative to the deep groove ball bearing of the prior art, as will be described in detail below.

[0007] In addition, due to the restrictions on the groove radius and groove limiting angle of the outer ring and the inner ring in the present invention, the shoulder surfaces on both sides of the outer ring groove of the deep groove ball bearing can be closer to the radial outer surface of the outer ring, and the shoulder surfaces on both sides of the inner ring groove of the deep groove ball bearing can be closer to the radial inner surface of the inner ring. As a result, the weight of the entire bearing can be reduced, which helps to reduce the weight of the equipment.

[0008] The deep groove ball bearing according to the present invention may have one or more of the following features.

[0009] According to one embodiment, preferably, the first ratio ranges from 0.530 to 0.565, the second ratio ranges from 0.515 to 0.530, the outer ring channel restriction angle ranges from 69° to 94°, and the inner ring channel restriction angle ranges from 76° to 96°.

[0010] According to one embodiment, preferably, the first ratio ranges from 0.535 to 0.560, the second ratio ranges from 0.520 to 0.530, the outer ring channel restriction angle ranges from 72° to 84°, and the inner ring channel restriction angle ranges from 80° to 92°.

[0011] The above-described embodiment is a preferred embodiment of the present invention, which has a further reduced friction torque of the deep groove ball bearing.

[0012] According to one embodiment, preferably, the deep groove ball bearing includes grease. This embodiment enables the deep groove ball bearing using grease to have a further reduced friction torque.

[0013] According to one embodiment, preferably, the viscosity of the grease at 40°C is less than 40 mm 2 / s.

[0014] According to one embodiment, preferably, the viscosity of the grease at 40°C is less than 30 mm 2 The above embodiment enables the deep groove ball bearing to have a further reduced friction torque.

[0015] According to one embodiment, preferably, the cage is made of polymer. The deep groove ball bearing according to this embodiment has a lighter weight, which helps to reduce the weight of the entire device.

[0016] According to one embodiment, preferably, the retaining frame is a nylon plastic retaining frame.

[0017] According to one embodiment, preferably, the retaining frame comprises a material capable of absorbing lubricating grease.

[0018] According to one embodiment, preferably, the cage is provided with openings or pores for storing lubricating grease. The deep groove ball bearing according to the above embodiment helps to maintain an appropriate amount of lubricating grease between the ball and the outer ring, the inner ring and the cage, improves the overall lubrication effect, and reduces the friction torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0020] Figure 1 is a cross-sectional perspective view of an embodiment of a deep groove ball bearing according to the present invention.

[0021] Figure 2 FIG. 4 is a schematic radial cross-sectional view of an embodiment of a deep groove ball bearing according to the present invention.

[0022] Figure 3 FIG. 4 is another schematic radial cross-sectional view of an embodiment of a deep groove ball bearing according to the present invention.

[0023] Figure 4 1 is a part of a schematic cross-sectional view of an embodiment of a deep groove ball bearing according to the present invention, and the cross section is a center plane of the deep groove ball bearing that is orthogonal to the axial direction.

[0024] Figures 5A-5C 1 and 2 are radial cross-sectional views of a plurality of embodiments of a deep groove ball bearing according to the present invention.

[0025] Reference numerals list

[0026] 1 Outer ring

[0027] 10 Outer raceway

[0028] 11 First shoulder of outer ring

[0029] 12 Second shoulder of outer ring

[0030] 13 First edge of outer raceway

[0031] 14 Second edge of outer raceway

[0032] 15 Center of the arc of the outer raceway

[0033] 2 Inner ring

[0034] 20 Inner raceway

[0035] 21 First shoulder of inner ring

[0036] 22 Second shoulder of inner ring

[0037] 23 First edge of inner raceway

[0038] 24 Second edge of inner raceway

[0039] 25 Center of the arc of the inner groove

[0040] 3 balls

[0041] 30 Center of the ball

[0042] 4 Cage

[0043] 5 Grease

[0044] 6 Seals DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The present invention will be described in detail below by way of describing exemplary embodiments.

[0048] Figure 1 FIG. 2 shows a perspective view of an embodiment of a deep groove ball bearing 100 according to the present invention. Figure 1 As shown, the deep groove ball bearing 100 has an outer ring 1, an inner ring 2, balls 3 disposed between the outer ring 1 and the inner ring 2, and a cage 4 for retaining the balls 3. Figure 1 Not shown, but Figure 1The deep groove ball bearing 100 shown has a set of balls 3 between its outer ring 1 and inner ring 2 for the operation of the deep groove ball bearing 100. Figure 1 The deep groove ball bearing 100 shown also has two annular seals 6 arranged on both axial sides of the ball 3 to prevent dust from entering between the outer ring 1 and the inner ring 2. However, according to other embodiments of the present invention, the seals of the deep groove ball bearing may be arranged to prevent the lubricating oil or grease between the outer ring 1 and the inner ring 2 from flowing out, or the deep groove ball bearing may not be provided with seals.

[0049] Furthermore, if Figure 1 As shown, the outer ring 1 has an outer ring groove 10, and the inner ring 2 has an inner ring groove 20. The outer ring groove 10 and the inner ring groove 20 respectively accommodate a part of the ball 3, so that the ball 3 can roll relative to the outer ring 1 and the inner ring 2 in the annular space formed by the outer ring groove 10 and the inner ring groove 20.

[0050] like Figure 2 As shown, the outer ring groove 10 is an arc shape in the radial section of the deep groove ball bearing 100, and the radius re of the arc is the outer ring groove radius re. The inner ring groove 20 is an arc shape in the radial section of the deep groove ball bearing 100, and the radius ri of the arc is the inner ring groove radius ri. Figure 2 Also shown is the center 30 of the ball 3 and the radius r of the ball 3. The ratio of the outer ring groove radius re to the diameter 2r of the ball 3 defines a first ratio fe=re / 2r, and the ratio of the inner ring groove radius ri to the diameter 2r of the ball 3 defines a second ratio fi=ri / 2r. According to an embodiment of the deep groove ball bearing 100 of the present invention, the first ratio fe ranges from 0.525 to 0.570, and the second ratio fi ranges from 0.510 to 0.530. In other words, the outer ring groove radius re and the inner ring groove radius ri are both slightly larger than the radius r of the ball 3. Thus, as Figure 2 As shown, the center 15 of the arc of the outer ring groove 10 is farther away from the outer ring groove 10 relative to the center 30 of the ball 3 , and the center 25 of the arc of the inner ring groove 20 is farther away from the inner ring groove 20 relative to the center 30 of the ball 3 .

[0051] In addition, if Figure 2As shown, the outer ring groove 10 has two annular edges, namely the first edge 13 and the second edge 14. The first edge 13 and the second edge 14 are the annular edges at both ends of the outer ring groove 10 along the axial direction of the bearing. The inner ring groove 20 has two annular edges, namely the first edge 23 and the second edge 24. The second edge 23 and the second edge 24 are the annular edges at both ends of the inner ring groove 20 along the axial direction of the bearing. The first edge 13 and the second edge 14 of the outer ring groove 10 define the outer ring groove limiting angle Ae relative to the center 15 of the arc of the outer ring groove 10, and the first edge 23 and the second edge 24 of the inner ring groove 20 define the inner ring groove limiting angle Ai relative to the center 25 of the arc of the inner ring groove 20. In addition, in this embodiment of the deep groove ball bearing 100, the outer ring groove limiting angle Ae ranges from 66° to 97°, and the inner ring groove limiting angle Ai ranges from 72° to 99°.

[0052] In the deep groove ball bearing 100 according to the present invention, by limiting the first ratio fe, the second ratio fi, the outer ring groove limit angle Ae and the inner ring groove limit angle Ai within the above-mentioned combination range, the friction torque exerted on the bearing can be effectively reduced.

[0053] In addition, according to the first preferred embodiment of the present invention, the first ratio fe ranges from 0.530 to 0.565, the second ratio fi ranges from 0.515 to 0.530, the outer ring channel restriction angle Ae ranges from 69° to 94°, and the inner ring channel restriction angle Ai ranges from 76° to 96°.

[0054] According to a second preferred embodiment of the present invention, the first ratio fe ranges from 0.535 to 0.560, the second ratio fi ranges from 0.520 to 0.530, the outer ring channel restriction angle Ae ranges from 72° to 84°, and the inner ring channel restriction angle Ai ranges from 80° to 92°.

[0055] According to a third preferred embodiment of the present invention, the deep groove ball bearing comprises grease.

[0056] According to a fourth preferred embodiment of the present invention, the viscosity of the grease at 40°C is less than 40 mm 2 / s.

[0057] According to a fifth preferred embodiment of the present invention, the viscosity of the grease at 40°C is less than 30 mm 2 / s.

[0058] In the tests conducted on deep groove ball bearings with the above-mentioned geometry, these deep groove ball bearings have demonstrated the ability to significantly reduce the friction torque they are subjected to. In the tests, the internal geometry of these deep groove ball bearings complies with the above-mentioned combination range, the external geometry complies with the applicant's 6208-2Z / C3 model bearings, and are provided with nylon plastic cages and filled with a viscosity of less than 40mm at 40°C. 2 / s of grease. During the test, the bearing speed was 3600rpm, the load included general radial load and axial preload, and the ratio of basic rated dynamic load C to bearing equivalent dynamic load P was C / P=20.

[0059] On the other hand, the applicant tested the friction torque of the existing 6208-2Z / C3 deep groove ball bearing under the same conditions for comparison. In the deep groove ball bearing, fe = 0.523 ~ 0.530, fi = 0.508 ~ 0.515, Ae = 98 ° ~ 102 °, Ai = 100 ° ~ 105 °. The existing deep groove ball bearing used in the comparative test is also provided with a nylon plastic cage and filled with the same type of grease, and the same load setting is used in the comparative experiment.

[0060] The test results show that the friction torque of the deep groove ball bearing according to the present invention is significantly lower than the friction torque of the existing deep groove ball bearing measured in the comparative experiment, and the deep groove ball bearing according to the first preferred embodiment of the present invention is subjected to a further reduced friction torque, and the deep groove ball bearing according to the second preferred embodiment of the present invention is subjected to an even lower friction torque. In particular, the test results show that the friction torque of the deep groove ball bearing according to a preferred embodiment of the present invention can be reduced by 70% relative to the existing deep groove ball bearing.

[0061] Figure 3 Another schematic radial cross-sectional view of an embodiment of a deep groove ball bearing 100 according to the present invention is shown to help explain the advantages of the deep groove ball bearing according to the present invention. Figure 3 Only a part of the ball 3 and the inner ring 2 are shown in the figure, so that the interaction between the ball 3, the inner ring 2 and the outer ring 1 is described by taking the inner ring 2 as an example. Figure 3 In the figure, the radius ri of the inner ring channel 20 is exaggerated to more clearly show the first edge 23 and the second edge 24 of the inner ring channel 20.

[0062] The friction torque of deep groove ball bearings during operation comes from the friction force experienced by the outer ring or inner ring of the bearing. The friction force is affected by many factors, and these factors also affect each other. In the prior art, the influence of the ratio of the diameter of the groove to the ball, fe, fi, on reducing the friction torque has been studied, but there is no public research project or research results on the influence of the coupling of fe, fi and Ae, Ai on the friction torque.

[0063] In the deep groove ball bearing of the present application, by jointly controlling the respective ranges of the first ratio fe, the second ratio fi, the outer ring groove limiting angle Ae and the inner ring groove limiting angle Ai, the friction torque on the bearing can be significantly reduced. The following is a possible reason analyzed by the applicant.

[0064] like Figure 3 As shown, during the operation of the bearing, the surfaces of the ball 3 and the inner ring groove 20 are squeezed against each other, thereby forming a contact area 26. In the contact area 26, the ball 3 generates a compressive stress σ along the radial direction of the bearing on the inner ring 2, and in the contact area 26, both the ball 3 and the inner ring groove 20 generate elastic deformation. The elastic deformation is continuously generated and restored during the rolling process of the ball 3, generating elastic resistance to the relative movement of the ball 3 and the inner ring 2, and the elastic resistance becomes a part of the friction force on the bearing.

[0065] On the other hand, Figure 3 and Figure 4 As shown in FIG. 1 , there is grease 5 in the gap space between the surface of the ball 3 and the inner raceway 20. The grease 5 plays a lubricating role during the relative movement of the ball 3 and the inner raceway 20, especially in the contact area 26. At the same time, as the ball 3 rolls relative to the inner raceway 20, it squeezes out the grease 5 in the gap space in front of the contact area 26 (see FIG. 1 ). Figure 4 ), so the movement of the grease 5 also produces resistance to the rolling of the ball 3, which results in another part of the friction force on the bearing.

[0066] Therefore, on the basis of reducing the contact area between the ball 3 and the groove surface by increasing the radius re and ri of the outer ring groove 10 and the inner ring groove 20, thereby reducing the friction force, by appropriately reducing the arc length of the outer ring groove 10 and the inner ring groove 20 in the radial section of the bearing, for example, by controlling the outer ring groove limit angle Ae and the inner ring groove limit angle Ai, it may be possible to affect the dynamic process of the grease 5 being displaced by the ball 3, thereby reducing the friction force. In addition, the radii of the outer ring groove 20 and the inner ring groove 10 respectively constitute the shape of the gap space between the ball 3 and the two groove surfaces, so the radii of the outer ring groove 20 and the inner ring groove 10 will also affect the dynamic process of the grease 5 being displaced by the ball 3, thereby reducing the friction force.

[0067] In other words, the first ratio fe, the second ratio fi, the outer ring groove limit angle Ae and the inner ring groove limit angle Ai together affect the friction torque of the bearing in various ways, and the applicant has found that the specific shape of the deep groove ball bearing according to the present invention can significantly reduce the friction torque. In addition, the applicant has found that the grease used in the deep groove ball bearing according to the present invention, especially the viscosity of less than 40mm at 40°C, 2 / s of grease, a significantly reduced friction torque will be obtained compared to the deep groove ball bearings in the prior art. This optimized effect may also be related to a specific combination of fe, fi, Ae, and Ai ranges.

[0068] Figures 5A to 5C Other embodiments according to the present invention are shown. Figure 5A In the deep groove ball bearing shown in , the cage 4 is a steel cage. Figure 5B In the deep groove ball bearing shown in , the retainer 4 is a nylon plastic retainer. According to other embodiments of the present invention, the retainer 4 may also be made of other materials, such as polymer materials. In addition, in embodiments not shown according to the present invention, the retainer of the bearing may be provided with openings or pores for storing lubricating grease, or the retainer of the bearing may include a material capable of absorbing lubricating grease, such as phenolic resin. Thus, an appropriate amount of lubricating oil or grease can be maintained on the outer surface of the ball by the retainer, thereby ensuring the lubrication effect and reducing the friction torque of the deep groove ball bearing.

[0069] exist Figure 5C In the deep groove ball bearing shown in , the cage 4 is a nylon plastic cage, and the deep groove ball bearing also has a sealing ring 6 for sealing grease 5, and the outer ring 1 and the inner ring 2 are filled with grease 5. Figure 5C The deep groove ball bearing of also meets the combination range of the deep groove ball bearing according to the present invention regarding the ratios fe, fi, and the limit angles Ae, Ai, and it also has a significantly reduced friction torque.

[0070] The exemplary implementations of the bearing retainer and the bearing proposed in the present invention are described in detail above with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined in various ways without exceeding the scope of protection of the present invention.

Claims

1. A deep groove ball bearing (100), comprising an outer ring (1), an inner ring (2), a ball (3) disposed between the outer ring and the inner ring, and a retaining frame (4) for retaining the ball, wherein: The outer ring (1) has an outer ring groove (10), the outer ring groove defines an outer ring groove radius (re), the ratio of the outer ring groove radius (re) to the diameter of the ball defines a first ratio (fe), two edges (13, 14) of the outer ring groove (10) in the axial direction relative to the center (15) of the arc of the outer ring groove (10) define an outer ring groove limit angle (Ae), The inner ring (2) has an inner ring groove (20), the inner ring groove defines an inner ring groove radius (ri), the ratio of the inner ring groove radius (ri) to the diameter of the ball defines a second ratio (fi), two edges (23, 24) of the inner ring groove (20) in the axial direction relative to the center (25) of the arc of the inner ring groove (20) define an inner ring groove limit angle (Ai), Among them, the range of the first ratio (fe) is 0.525~0.570, the range of the second ratio (fi) is 0.510~0.530, the range of the outer ring channel restriction angle (Ae) is 66°~97°, and the range of the inner ring channel restriction angle (Ai) is 72°~99°.

2. The deep groove ball bearing according to claim 1, wherein: The first ratio ranges from 0.530 to 0.565, the second ratio ranges from 0.515 to 0.530, the outer ring channel restriction angle ranges from 69° to 94°, and the inner ring channel restriction angle ranges from 76° to 96°.

3. The deep groove ball bearing according to claim 2, wherein: The first ratio ranges from 0.535 to 0.560, the second ratio ranges from 0.520 to 0.530, the outer ring channel restriction angle ranges from 72° to 84°, and the inner ring channel restriction angle ranges from 80° to 92°.

4. The deep groove ball bearing according to any one of claims 1 to 3, wherein: The deep groove ball bearing includes grease.

5. The deep groove ball bearing according to claim 4, wherein: The viscosity of the grease at 40°C is less than 40 mm 2 / s.

6. The deep groove ball bearing according to claim 5, wherein: The viscosity of the grease at 40°C is less than 30 mm 2 / s.

7. The deep groove ball bearing according to any one of claims 1 to 3, wherein: The cage is made of a polymer.

8. The deep groove ball bearing according to claim 7, wherein: The retaining frame is a nylon plastic retaining frame.

9. The deep groove ball bearing according to claim 7, wherein: The cage includes a material capable of absorbing lubricating grease.

10. The deep groove ball bearing according to any one of claims 1 to 3, wherein: The retaining frame is provided with openings or pores for storing lubricating grease.

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