Crown-shaped holder for ball bearings and ball bearings

Abstract

A crown-shaped holder for a ball bearing comprises: a round, annular main section; several column sections projecting axially from the main section and arranged circumferentially at predetermined intervals; and a pocket formed between the adjacent column sections, capable of holding a ball. The pocket has a spherical shape and a concave surface. Each column section has two pairs of claw sections with pointed end sections spaced apart, and a connecting section linking the two claw sections. An inlet section, the width of which is smaller than the diameter of the ball, is provided between the front end regions of the two adjacent claw sections forming the pocket, and serves to insert the ball.The distance between the inner circumferential surface of the pocket and the center point of the crown-shaped holder for a ball bearing is smaller than the radius of the inner circumferential surfaces of the column parts.

Description

Technical area

[0001] The present invention relates to a crown cage for a ball bearing and a ball bearing. State of the art

[0002] Fig. Figure 30 is a cross-sectional view of a ball bearing 1 according to an example in the prior art. In general, this is shown in Fig. The ball bearings 1 shown in Figure 30 are used to support a rotating part of various rotating machines. The ball bearing 1 has an inner ring 3 with an inner ring raceway 2 on an outer circumferential surface of the same, an outer ring 5 arranged concentrically to the inner ring 3 with an outer ring raceway 4 on an inner circumferential surface of the same, and a plurality of balls 6 which are arranged to roll between the inner ring raceway 2 and the outer ring raceway 4.

[0003] Each ball 6 is held in a rollable position by the cage 100. The outer circumferential edges of two paired circular, annular shielding plates 7, 7 are each engaged with both axial end sections of the inner circumferential surface of the outer ring 5. The two shielding plates 7, 7 prevent a lubricant such as grease present in a region of the bearing from escaping to the outside, or dust suspended outside from entering the bearing area. Instead of the non-contacting shielding plates 7, 7, a contacting seal can be used as a sealing device.

[0004] Cage 100 is a crown cage made of resin. Fig. Figure 31 is a perspective view of cage 100 according to the prior art example. Fig. Figure 32 is a view of part of the cage 100 according to the prior art example, seen from a radially inner side. Fig. Figure 33 is a top view of part of cage 100 according to the prior art example. As in the Fig. As shown in Figures 31 to 33, the cage 100 has an annular main section 101, a plurality of column sections 102 which project in an axial direction at predetermined intervals in a circumferential direction from the main section 101, and pockets 103 which each have a spherical shape, are formed between the adjacent column sections 102 and can hold the sphere 6.

[0005] The column section 102 has two claw sections 105 and 105, arranged as a pair, the tips of which are spaced apart. Since the two adjacent claw sections 105 and 105, which form the pocket 103, hold the ball 6, the cage 100 is prevented from falling axially between the outer ring 5 and the inner ring 3. As shown in the figure, the cage 100 is Fig. Figure 33 shows that a distance L1 from the inner circumferential surface of the pocket 103 to the center of the cage 100 (the radius of the inner circumferential surface of the pocket 103) is equal to a radius r1 of the inner circumferential surface of the column section 102 (of the claw section 105) (L1 = r1).

[0006] In recent years, it has become increasingly necessary for rolling bearings (especially ball bearings) supporting a rotating engine shaft to withstand high rotational speeds, particularly in automotive applications. To achieve high rotational speeds, it is necessary to (i) prevent fatigue fractures by suppressing cage expansion due to centrifugal force and reducing the stress generated in the lower part of the pocket, and (ii) prevent cage contact with the outer ring and seal by suppressing cage deformation, thereby reducing wear, vibration, and heat generation.

[0007] In the state-of-the-art cage 100, as in the Fig. Figures 31 to 33 show the stress caused by centrifugal force acting on the cage 100 during high rotational speeds, and the cage 100 can be deformed towards the outer diameter. Fig. 30 is a condition in which the cage 100 is deformed, represented by a dashed line. In this case, the cage 100 can be connected to the outer ring 5 (see Part A in Fig. 30) come into contact, the cage 100 can be connected to the shielding plate 7 (see Part B in Fig. 30) come into contact and the cage 100 can wear out, vibrate or generate heat.

[0008] A cage described in patent literature 1 has an annular base section and an axial section extending axially from the base section. The outer diameter of the axial section is smaller than the outer diameter of the base section. The base section is provided with a hole that communicates with a recessed area of ​​the axial section and extends axially. Accordingly, the amount of material (i.e., the mass of the cage) is reduced, and radial deformation induced during high-speed rotation is suppressed. List of cited writings Patent literature

[0009] Patent literature 1: JP5436204B Overview of the invention Technical task

[0010] However, to meet the demands of high rotational speeds, it is not sufficient to simply reduce deformation by decreasing the cage weight or the load or stress generated in the pockets. It is necessary to reduce the cage deformation caused by centrifugal force and further reduce the load by modifying the shape to increase stiffness. Accordingly, it is possible to avoid the loss of service life in areas of high load or stress generated in the pocket.

[0011] The present invention was conceived in view of the above-mentioned circumstances, and one objective is to provide a crown cage for a ball bearing and a ball bearing that is able to suppress the deformation of the cage and reduce the load or stress. Solution to the task

[0012] The above-mentioned objective of the present invention is achieved by the following structure. [1] A crown cage for a ball bearing has: a ring-shaped main section; Several column sections projecting from the main section at predetermined intervals in an axial direction and circumferentially; and a pocket formed between adjacent column sections, having a spherical concave surface or area with a spherical shape and capable of holding a sphere, wherein the column section has two claw sections designed as a pair with tip end sections arranged at intervals between them, and a connecting section that connects the two claw sections, an inlet section with a width smaller than the diameter of the ball is provided for inserting the ball between the tip end sections of the two adjacent claw sections that form the pocket, and a distance from an inner circumferential surface of the pocket to the center of the crown cage for a ball bearing is smaller than a radius of an inner circumferential surface of the column section. [2] A ball bearing has: an outer ring; an inner ring; several balls arranged between the outer ring and the inner ring; and the crown cage for a ball bearing according to [1]. Advantageous effects of the invention

[0013] According to the crown cage for a ball bearing and the ball bearing of the present invention, deformation of the cage can be suppressed and the load reduced. Short description of the drawings Fig. Figure 1 is a view of part of a cage according to a first embodiment, seen from a radially inner side. Fig. Figure 2 is a top view of the part of the cage according to the first embodiment. Fig. Figure 3 is a view of part of a cage according to a modification of the first embodiment, seen from a radially inner side. Fig. Figure 4 is a top view of the part of the cage according to the modification of the first embodiment. Fig. Figure 5 is a perspective view of a cage according to a second embodiment. Fig. Figure 6 is a top view of the cage according to the second embodiment. Fig. Figure 7 is a view of part of the cage according to the second embodiment, seen from a radially inner side. Fig. Figure 8 is a top view of the part of the cage according to the second embodiment. Fig. Figure 9 is a view of part of a cage according to a modification of the second embodiment, seen from a radially inner side. Fig. Figure 10 is a top view of the part of the cage according to the modification of the second embodiment. Fig. Figure 11 is a perspective view of a cage according to a third embodiment. Fig. Figure 12 is a top view of the cage according to the third embodiment. Fig. Figure 13 is a view of part of the cage according to the third embodiment, seen from a radially inner side. Fig. Figure 14 is a top view of the part of the cage according to the third embodiment. Fig. Figure 15 is a view of part of a cage according to a modification of the third embodiment, seen from a radially inner side. Fig. Figure 16 is a top view of the part of the cage according to the modification of the third embodiment. Fig. Figure 17 is a perspective view of a cage according to a fourth embodiment. Fig. Figure 18 is a top view of the cage according to the fourth embodiment. Fig. Figure 19 is a view of part of the cage according to the fourth embodiment, as seen from a radially inner side. Fig. Figure 20 is a top view of the part of the cage according to the fourth embodiment. Fig. 21A, Fig. 21C, Fig. 21E and Fig. 21G are top views, each showing part of a cage, and Fig. 21B, Fig. 21D, Fig. 21F and Fig. 21H are views that each show the part of the cage from the radially inner side. Fig. 21A and Fig. 21B is a comparative example and shows a cage that is in Fig. 31 to 33 is shown as a product of the state of the art, Fig. 21C and Fig. Figure 210 is an example and shows the cage of the first embodiment, which is located in the Fig. 1 and Fig. 2 is shown, Fig. 21E and Fig. 21F are an example and show the cage according to the modification of the first embodiment, which is described in the Fig. 3 and Fig. 4 is shown, and Fig. 21G and Fig. Figure 21H shows a cage according to a comparative example. Fig. 22A, Fig. 22C, Fig. 22E and Fig. 22G are top views, each showing part of a cage, and Fig. 22B, Fig. 22D, Fig. 22F and Fig. 22H are views that each show the part of the cage from the radially inner side. Fig. 22A and Fig. Figure 22B shows a cage according to a comparative example. Fig. 22C and Fig. 22D are an example and show the cage according to the second embodiment, which is described in the Fig. 5 to 8 is shown, Fig. 22E and Fig. 22F are an example and show the cage according to the one in the Fig. 9 and Fig. 10 modification of the second embodiment shown, and Fig. 22G and Fig. Figure 22H shows a cage according to a comparative example. Fig. 23A, Fig. 23C, Fig. 23E and Fig. 23G are top views, each showing part of a cage, and Fig. 23B, Fig. 23D, Fig. 23F and Fig. 23H are views that each show the part of the cage from the radially inner side. Fig. 23A and Fig. Figure 23B shows a cage according to a comparative example. Fig. 23C and Fig. 23D are an example and show the cage according to the third embodiment, which is described in the Fig. shown in 11 to 14, Fig. 23E and Fig. 23F are an example and show the cage according to the one in the Fig. 15 and Fig. 16 modification of the third embodiment shown, and Fig. 23G and Fig. 23H is an example and shows the cage according to the one in the Fig. fourth embodiment shown in 17 to 20. Fig. Figure 24, including sections (a) to (d), shows a maximum principal stress distribution generated in the cages by a centrifugal force. The stress distribution in sections (a) to (d) of Fig. The 24 cages shown correspond to those in the Fig. 23A, Fig. 23C, Fig. Cage shown in 23E or 23G. Fig. Figure 25 shows the results of a relative comparison of a maximum value of a maximum principal stress caused by a centrifugal force in each in Fig. 21A to Fig. The cage shown in 23H is created. Fig. 26 is a cross-sectional view along a line AA of Fig. 23G. Fig. Figure 27 shows a stress distribution when a centrifugal force is applied, in the example of Fig. 23H is applied. Fig. Figure 28 is a diagram illustrating an analysis model. Fig. 29, including sections (a) and (b), shows the analysis results of a strain distribution or distribution of the deformation of the cages. Fig. Figure 30 is a cross-sectional view of a ball bearing 1 according to a prior art example. Fig. Figure 31 is a perspective view of a cage 100 according to the example of the prior art. Fig. Figure 32 is a view of part of the cage 100 according to the prior art example, seen from a radially inner side. Fig. Figure 33 is a top view of part of cage 100 according to the prior art example. Description of embodiments

[0014] A crown cage for a ball bearing and a ball bearing according to an embodiment of the present invention are described below with reference to the drawings. (First embodiment)

[0015] Fig. Figure 1 is a view of part of a cage according to a first embodiment when viewed from a radially inner side. Fig. Figure 2 is a top view of the portion of the cage according to the first embodiment. As shown in the Fig. 1 and Fig. As shown in Figure 2, a crown cage for a ball bearing (hereinafter referred to as "crown cage" or simply "cage") 110 of the present embodiment can be constructed similarly to a cage 100 in the Fig. The state of the art shown in 31 to 33 is based on a Fig. 30 ball bearings 1 are applied.

[0016] The crown cage 110 is made of a resin material, such as nylon 46 (polyamide 46, PA46), nylon 66 (polyamide 66, PA66), polyamide 9T (PA9T), polyamide 10T (PA10T), L-PPS, PEEK, or the like, or another resin material. To improve the strength of the cage 110, a resin composition can be used to which a fiber-reinforcing material (carbon fiber, glass fiber, aramid fiber, or the like) is added in an amount of 10% (for example, 10 to 50 wt%). Examples of a method for manufacturing the cage 110 include an injection molding process using a mold and a 3D printing process.

[0017] The crown cage 110 has a substantially ring-shaped main section 101, several column sections 102 projecting axially at predetermined intervals in a circumferential direction from the main section 101, and pockets 103, each having a spherical shape and formed between the adjacent column sections 102, 102 and capable of holding a sphere 6 (see Fig. 30).

[0018] Several spherical concave surfaces 104, each having a spherical shape, are formed at predetermined intervals in the circumferential direction within the main section 101. The spherical concave surface 104 extends over the entire radial width of the main section 101 and forms the pocket 103.

[0019] The column section 102 projects axially beyond the entire radial width of the main section 101. The column section 102 has two claw sections 105, 105 arranged as a pair and a connecting section 113 that connects the two claw sections 105, 105.

[0020] The end sections of the tips or tip end sections of the two claw sections 105 and 105 are arranged at intervals in the circumferential direction. Furthermore, an inlet section 106 is provided with a width that is smaller than the diameter of the ball 6 (see Fig. 30), for inserting the ball 6 between the tip end sections of the two adjacent claw sections 105, 105, which form the pocket 103.

[0021] The circumferential surfaces of the two adjacent claw sections 105, 105 and the spherical concave surface 104 of the main section 101 form the pocket 103. The two circumferential surfaces and the spherical concave surface 104 are seamlessly joined to form a spherical concave surface of the pocket 103. The radius of curvature of the spherical concave surface of the pocket 103 is larger than the radius of curvature of a rolling surface of the sphere 6 (see Fig. 30).

[0022] As described above, the multiple pockets 103 are connected to each other by the main section 101, so that when a centrifugal force acts on the cage 110 during a high rotation speed or the like, it falls to a radially outer side with the main section 101 as its center.

[0023] To suppress falling, an inner circumferential side of the pocket 103, where a high stress or load is generated (an inner circumferential side of the main section 101 forming the pocket 103), is designed to be thickened towards the radially inner side. That is, as in Fig. As shown in Figure 2, the distance L1 from an inner circumferential surface (inner circumferential surface of the main section 101 forming the pocket 103) 111 of the pocket 103 to a center of the cage 110 is smaller than the radius r1 of an inner circumferential surface 112 of the column section 102 (L1 < r1). Accordingly, the stiffness of the pocket 103 on the side of the main section 101 is improved, and deformation of the crown cage 110 can be suppressed. On the other hand, in the cage 100, according to a prior art example, as shown in Fig. Figure 33 shows a distance from an inner circumferential surface of the pocket 103 to a center of the cage 100 equal to the radius r1 of an inner circumferential surface of the column section 102 (L1 = r1).

[0024] In the example shown, the inner circumferential surface (inner circumferential surface of the main section 101 forming the pocket 103) 111 of the pocket 103 has two connecting surfaces 111a, 111a provided as a pair, which are positioned on both sides of the inner circumferential surface in the circumferential direction and are connected to the inner circumferential surface 112 of the column section 102, and has a convex surface 111b which connects the inner side end sections of the two connecting surfaces 111a, 111a together in the circumferential direction.

[0025] The two connecting surfaces 111a, 111a are curved surfaces that have essentially the same curvature as the inner circumferential surface 112 of the column section 102. The distance between the two connecting surfaces 111a, 111a and the center of the cage 110 corresponds essentially to the radius r1 of the inner circumferential surface 112 of the column section 102.

[0026] The convex surface 111b is a plane projecting radially inward from the connecting surface 111a and the inner circumferential surface 112 of the column section 102. The shape of the convex surface 111b is not restricted to a plane and can have any shape, for example, an arc connecting the inner surfaces of the connecting surfaces 111a, 111a, or a cylindrical surface shape, as described below. The distance L1 from an inner circumferential surface of the convex surface 111b to the center of the cage 110 is less than the radius r1 of the inner circumferential surface 112 of the column section 102.

[0027] The circumferential width of the convex surface 111b of the inner circumferential surface 111 is preferably set to a region where the stress or load is particularly high when the centrifugal force occurs. That is, a region of approximately half the inner diameter of the pocket up to a point on the diameter of the pocket is preferable.

[0028] As described above, according to the cage 110 of the present embodiment, deformation of the cage 110 is suppressed and the stress is reduced by thickening the inner circumferential side of the pocket 103, where a high stress is generated, towards the radially inner side. This prevents the cage 110 from coming into contact with the outer ring 5, the shielding plate 7 or the like, and suppresses wear, vibration, heat generation or the like of the cage 10. (Modification of the first embodiment)

[0029] Fig. Figure 3 is a view of part of a cage when viewed from a radially inner side according to a modification of the first embodiment. Fig. Figure 4 is a top view of the portion of the cage according to the modification of the first embodiment. As shown in the Fig. 3 and Fig. As shown in Figure 4, in the present modification the circumferential width of the convex surface 111b of the inner circumferential surface 111 of the pocket 103 is larger than in the example of the Fig. 1 and Fig. 2. In particular, both end sections are arranged in the circumferential direction of the convex surface 111b at essentially the same position in the circumferential direction with respect to the tip end sections (end sections on the inside in the circumferential direction) of the two claw sections 105, 105. Accordingly, the stiffness in the area of ​​the pocket 103 of the cage 110 can be further increased. (Second embodiment)

[0030] Next, a crown cage for a ball bearing according to a second embodiment of the present invention will be described with reference to the drawings.

[0031] Fig. Figure 5 is a perspective view of the cage according to the second embodiment. Fig. Figure 6 is a top view of a cage according to the second embodiment. Fig. Figure 7 is a view of part of the cage according to the second embodiment, seen from a radially inner side. Fig. Figure 8 is a top view of the part of the cage according to the second embodiment.

[0032] A crown cage 210 of the present embodiment has an annular main section 201, several column sections 202 which project axially at predetermined intervals in the circumferential direction from an upper surface of the main section 201, and pockets 203, each having a spherical shape, formed between the adjacent column sections 202, 202 and which can hold the ball 6 (see Fig. 30).

[0033] Several spherical concave surfaces 204, each having a spherical shape, are formed at predetermined intervals in the circumferential direction on the upper surface of the main section 201. The spherical concave surface 204 extends over the entire radial width of the main section 201 and forms the pocket 203.

[0034] The column section 202 projects axially from a radially inner side portion of the upper surface of the main section 201. Furthermore, the upper surface of the main section 201 is exposed on a radially outer side of the column section 202. Since, in the first embodiment, the column section 102 projects axially across the entire radial width of the upper surface of the main section 101, the column section 202 of the second embodiment differs in this respect. That is, in the second embodiment, a structure is used in which a section on the radially outer side of the column section 202 (claw sections 205) is raised. Thus, the column section 202 of the second embodiment projects axially only from the radially inner side portion of the upper surface of the main section 201 and is spaced from a radially central portion and a radially outer side portion of the upper surface of the main section 201.Accordingly, the weight of the column section 202, i.e. the weight of the cage 210, is reduced and deformation of the claw section 205 due to centrifugal force is suppressed even during high-speed rotation.

[0035] The column section 202 has the two claw sections 205, 205 and a connecting section 213, which connects the two claw sections 205, 205.

[0036] The tip end sections of the two claw sections 205, 205 are arranged at intervals in the circumferential direction.

[0037] An inlet section 206 with a width that is smaller than the diameter of the sphere 6 (see Fig. 30), for the insertion of the ball 6, a space is provided between the tip end sections of the two adjacent claw sections 205, 205, which form the pocket 203.

[0038] The claw section 205 has a first spherical circumferential surface 205b, which forms the pocket 203, and a second circumferential surface 205c, which is opposite the first circumferential surface 205b.

[0039] The second circumferential surfaces 205c, 205c of the two claw sections 205, 205 each have curved shapes and are seamlessly connected to one another on an upper surface 213a of the connecting section 213. The upper surface 213a of the connecting section 213 corresponds to an essentially U-shaped base section formed by the upper surface 213a and the two second circumferential surfaces 205c, 205c. The upper surface 213a (a lower section of the two circumferentially extending second surfaces 205c, 205c) of the connecting section 213 is positioned slightly above (one side in the axial direction) the upper surface of the main section 201. Accordingly, the lower section (the upper surface 213a of the connecting section 213) of the two second circumferential surfaces 205c, 205c is positioned axially (the other side axially) below a center of the cage 210 and forms an essentially U-shaped recessed section. As in Fig. As shown in Figure 32, in the crown cage 100 of the prior art, an upper surface of a connecting section (a lower section of two second circumferential surfaces) is positioned much higher than an upper surface of the main section 101 and above a center of the cage 100 in the axial direction (one side in the axial direction).

[0040] As in Fig. As shown in Figure 8, the outer diameter of the claw section 205 is set to be smaller than the outer diameter of the main section 201.

[0041] Furthermore, the radial width t1 of the claw section 205 is set to 1 / 2 or less than the radial width t2 of the main section 201 {t1 ≤ (t2) / 2}.

[0042] As in Fig. As shown in Figure 7, an axial width h2 from the upper surface 213a of the connecting section 213 of the column section 202 to a bottom surface of the main section 201 is set to 1 / 2 or less of an axial width h3 of the cage 210 {h2 ≤ (h3) / 2}. Furthermore, an axial width h1 on a side of the connecting section 213 where the column section 202 (the claw section 205) is not present, i.e., on the radially outer side, is also set to 1 / 2 or less of the axial width h3 {h1 ≤ (h3) / 2}. The axial width h1 is smaller than the axial width h2 (h1 < h2).

[0043] If the axial widths h1, h2 are too small, the strength of the cage 210 may decrease, and therefore the axial widths h1, h2 are preferably larger than an axial width h4 of the main section 201 in a bottom section of the pocket 203 (h1 > h4, h2 > h4).

[0044] The main section 201 is provided with an opening section 215 that opens axially between the adjacent pockets 203, 203. The opening section 215 penetrates the bottom surface from the upper surface of the main section 201 in the axial direction. The opening section 215 is positioned on the radially outer side of the column section 202 (the two claw sections 205, 205). This means that at least a portion of the opening section 215 overlaps the column section 202 (the two claw sections 205, 205) in the circumferential direction. Furthermore, the claw section 205 and the opening section 215 are arranged to be offset in the radial direction, and the opening section 215 is positioned on the radially outer side of the claw section 205. Providing the opening section 215 in this way reduces the weight of the cage 210.

[0045] If the width of the column section 202 or the claw section 205 of the cage 210 is reduced, there is a possibility that the strength will decrease, and there is a possibility that the resin will not flow properly and voids will form if the cage 210 is manufactured by injection molding. The width of each part of the cage 210 is preferably 1 mm or more.

[0046] As described above, the multiple pockets 203 are connected to each other by the main section 201, and when centrifugal force acts on the cage 210 during high-speed rotation or the like, the cage 210 falls towards the radially outer side, with the main section 201 forming the center. To suppress this falling, an inner circumferential side of the pocket 203, where a high stress is generated (an inner circumferential side of the main section 201 forming the pocket 203), is designed to be thickened towards the radially inner side.

[0047] That is, as in Fig. As shown in Figure 8, the distance L1 from an inner circumferential surface 211 of the pocket 203 (an inner circumferential surface of the main section 201 forming the pocket 203) to a center of the cage 210 is smaller than the radius r1 of the inner circumferential surface 212 of the column section 202.

[0048] In the example shown, the inner circumferential surface (inner circumferential surface of the main section 201 forming the pocket 203) 211 of the pocket 203 has two connecting surfaces 211a, 211a provided as a pair, which are positioned on both sides of the inner circumferential surface 211 in the circumferential direction and are connected to the inner circumferential surface 212 of the column section 202, and has a convex surface 211b which connects the inner side end sections of the two connecting surfaces 211a, 211a together in the circumferential direction.

[0049] The two connecting surfaces 211a, 211a are curved surfaces that have essentially the same curvature as the inner circumferential surface 212 of the column section 202. The distance between the two connecting surfaces 211a, 211a and the center of the cage 210 corresponds essentially to the radius r1 of the inner circumferential surface 212 of the column section 202.

[0050] The convex surface 211b is a plane projecting radially inward from the connecting surface 211a and the inner circumferential surface 212 of the column section 202. The shape of the convex surface 211b is not restricted to a plane and can have any shape, for example, a cylindrical surface shape, as described below. The distance L1 from an inner circumferential surface of the convex surface 211b to the center of the cage 210 is less than the radius r1 of the inner circumferential surface 212 of the column section 202 (L1 < r1).

[0051] The circumferential width of the convex surface 211b of the inner circumferential surface 211 is preferably defined in a region where the stress or load is particularly high when the centrifugal force occurs. That is, a region extending from approximately half the inner diameter of the pocket to a point on the diameter of the pocket is preferable.

[0052] As described above, according to the cage 210 of the present embodiment, the weight of the cage 210 is reduced, the stiffness of the pocket 203 is improved, and deformation and stress caused by centrifugal force during high-speed rotation can be suppressed. This prevents the cage 210 from coming into contact with the outer ring 5, the shielding plate 7, or the like, and suppresses wear, vibration, heat generation, or the like of the cage 210. (Modification of the second embodiment)

[0053] Fig. Figure 9 is a view of part of a cage according to a modification of the second embodiment, wherein the view is from a radially inner side. Fig. Figure 10 is a top view of the part of the cage according to the modification of the second embodiment. As shown in the Fig. 9 and Fig. As shown in Figure 10, in the present modification the circumferential width of the convex surface 211b of the inner circumferential surface 211 of the pocket 203 is set larger than in the example of the Fig. 5 to 8. In particular, both end sections are arranged in the circumferential direction of the convex surface 211b at essentially the same position in the circumferential direction with respect to the tip end sections (end sections on the inside in the circumferential direction) of the two claw sections 205, 205. Accordingly, the stiffness in the area of ​​the pocket 203 of the cage 210 can be further increased. (Third embodiment)

[0054] Next, a crown cage for a ball bearing according to a third embodiment of the present invention will be described with reference to the drawings.

[0055] Fig. Figure 11 is a perspective view of the cage according to the third embodiment. Fig. Figure 12 is a top view of the cage according to the third embodiment. Fig. Figure 13 is a view of part of the cage according to the third embodiment, seen from a radially inner side. Fig. Figure 14 is a top view of the part of the cage according to the third embodiment.

[0056] The cage 210 of the present embodiment differs from the cage 210 of the second embodiment (see Fig. 5 to 10) by providing convex sections 217 on a base surface 216 of the main section 201. Since other components are identical to those of the second embodiment, the same reference numerals are used for the same components and their description is omitted or simplified.

[0057] The convex section 217 projects from the base surface 216 of the main section 201 in an axial direction (a direction opposite to the direction in which the claw section 205 extends from top to bottom). Fig. 11 extends) between the opening sections 215, 215, which adjoin each other in the circumferential direction. That is, the bottom surface 216 of the main section 201 has the several convex sections 217, which are formed at predetermined intervals in the circumferential direction below the several pockets 203.

[0058] A portion of the convex section 217 preferably overlaps the pocket 203 in the circumferential and radial directions. That is, a circumferential region and a radial region in which the convex section 217 is provided are preferably substantially equal to a circumferential region and a radial region in which the spherical concave surface 204 of the main section 201, which forms the pocket 203, is provided. A radial width and a circumferential width of the convex section 217 of the present embodiment are substantially equal to a radial width (the radial width t2 of the main section 201) and a circumferential width of the pocket 203.

[0059] According to the cage 210 of the third embodiment, the effect of suppressing the stress and deformation generated by the centrifugal force is not significantly different compared to the second embodiment if the axial width h4 of the main section 201 at a lower section of the pocket 203 has the same dimension. However, the effect is achieved when the cage 210 is installed in the bearing 1, which consists of the inner ring 3, the outer ring 5, and the balls 6. That is, as described later, the stress generated in the claw sections 205 of the cage 210 is reduced. (Modification of the third embodiment)

[0060] Fig. Figure 15 is a view of part of a cage according to a modification of the third embodiment, wherein the view is from a radially inner side. Fig. Figure 16 is a top view of the portion of the cage according to the modification of the third embodiment. As shown in the Fig. 15 and Fig. As shown in Figure 16, in the present modification the circumferential width of the convex surface 211b of the inner circumferential surface 211 of the pocket 203 is set larger than in the example of the Fig. 11 to 14. In particular, both end sections are arranged in the circumferential direction of the convex surface 211b at substantially the same position in the circumferential direction with respect to the tip end sections (end sections on the inside in the circumferential direction) of the two claw sections 205, 205. Accordingly, the stiffness in the area of ​​the pocket 203 of the cage 210 can be further increased. (Fourth embodiment)

[0061] Next, a crown cage for a ball bearing according to a fourth embodiment of the present invention will be described with reference to the drawings.

[0062] Fig. Figure 17 is a perspective view of the cage according to the fourth embodiment. Fig. Figure 18 is a top view of the cage according to the fourth embodiment. Fig. Figure 19 is a view of part of the cage according to the fourth embodiment, seen from a radially inner side. Fig. Figure 20 is a top view of the part of the cage according to the fourth embodiment.

[0063] The shape of the inner circumferential surface (an inner circumferential surface of the main section 201 forming the pocket 203) 211 of the pocket 203 in the cage 210 of the present embodiment differs from its shape in the cage 210 (see Fig. 11 to 16) of the third embodiment. Since other components are identical to those of the third embodiment, the same reference numerals are used for the same components and their descriptions are omitted or simplified.

[0064] In the present embodiment, similar to the embodiment described above, the distance L1 from the inner circumferential surface 211 of the pocket 203 to a center of the cage 210 is smaller than the radius r1 of the inner circumferential surface 212 of the column section 202 (L1 < r1).

[0065] In the example shown, the inner circumferential surface 211 of the pocket 203 is a cylindrical surface projecting radially inward from the inner circumferential surface 212 of the column section 202. The distance L1 from the inner circumferential surface 211 of the pocket 203 to the center of the cage 210 (i.e., a radius of the inner circumferential surface 211 of the pocket 203) is smaller than the radius r1 of the inner circumferential surface 212 of the column section 202.

[0066] Such a design improves the rigidity of the pocket 203 and suppresses deformation, stress, and strain caused by centrifugal force during high-speed rotation. This prevents the cage 210 from coming into contact with the outer ring 5, the shielding plate 7, or the like, and suppresses wear, vibration, heat generation, and the like of the cage 210.

[0067] The shape of the inner circumferential surface 211 of the pocket 203 of the present embodiment can be used not only for the third embodiment, but also for the inner circumferential surfaces 111, 211 of the pockets 103, 203 in the cage according to the first and second embodiments. (Example 1)

[0068] To confirm the effectiveness of the present invention, a finite element analysis was performed. The cage to be analyzed is a resin crown cage used for a bearing with an inner diameter of 35 mm. The cage shape was determined based on each embodiment of the present invention, using the resin crown cage 100 from the prior art and the like.

[0069] To confirm the effect of the first embodiment, the data contained in the Fig. The cage shapes shown in sections 21A to 21H are used. Fig. 21A, Fig. 21C, Fig. 21E and Fig. 21G are top views, each showing part of a cage, and the Fig. 21B, Fig. 21D, Fig. 21F and Fig. 21H are views that each show the part of the cage from the radially inner side. Fig. 21A and Fig. Figure 21B is a comparative example and shows cage 100, which is located in the Fig. 31 to 33 is shown as a product of the state of the art, Fig. 21C and Fig. Figures 21D are an example and show cage 110 of the first embodiment, which is described in the Fig. 1 and Fig. 2 is shown, Fig. 21E and Fig. Figures 21F are an example and show cage 110 according to the modification of the first embodiment, which is described in the Fig. 3 and Fig. 4 is shown, and the Fig. 21G and Fig. Figure 21H shows a cage 120 according to a comparative example.

[0070] In cage 120 according to the comparative example of Fig. 21G and Fig. 21H, compared to the example of Fig. 21A and Fig. 21B, not only the inner circumferential surface 111 of the pocket 103, but also the inner circumferential surface 112 on the side of the main section of the column section 102 projects towards the radially inner side.

[0071] Referring to the example of Fig. 21A and Fig. 21B (L1 = r1) the distance L1 from the inner circumferential surface 111 of the pocket 103 to a center of the cage in the Fig. 21C and Fig. 21D by 0.2 mm (L1 = r1 - 0.2 mm), in the Fig. 21E and Fig. 21F by 0.4 mm (L1 = r1 - 0.4 mm) and by 0.4 mm into the Fig. 21G and Fig. 21H (L1 = r1 - 0.4 mm) reduced.

[0072] To confirm the effect of the second embodiment, the data contained in the Fig. The cage shapes shown in sections 22A to 22H are used. Fig. 22A, Fig. 22C, Fig. 22E and Fig. 22G are top views, each showing part of a cage, and the Fig. 22B, Fig. 22D, Fig. 22F and Fig. 22H are views that each show the part of the cage from the radially inner side. Fig. 22A and Fig. Figure 22B shows a cage 200 according to a comparative example, which Fig. 22C and Fig. Figures 22D are an example and show the cage 210 according to the second embodiment, which is described in the Fig. 5 to 8 are shown, which Fig. 22E and Fig. Figures 22F are an example and show cage 210 according to the modification of the second embodiment, which is described in the Fig. 9 and Fig. 10 is shown, and Fig. 22G and Fig. 22H shows a cage 220 according to a comparative example.

[0073] Unlike the examples of Fig. 22C to 22F is the case for cage 200 according to the comparative example of the Fig. 22A and Fig. 22B the distance L1 from the circumferential surface 211 of the pocket 203 to the center of the cage is set so that it is equal to the radius r1 of the inner circumferential surface 212 of the column section 202 (L1 = r1).

[0074] In cage 220 according to the comparative example of the Fig. 22G and Fig. 22H is compared to the example of the Fig. 22A and Fig. 22B, not only the inner circumferential surface 211 of the pocket 203, but also the inner circumferential surface 212 on the side of the main section of the column section 202 towards the radially inner side.

[0075] Referring to the example of Fig. 22A and Fig. 22B (L1 = r1) the distance L1 from the inner circumferential surface 211 of the pocket 203 to a center of the cage in the Fig. 22C and Fig. 22D by 0.2 mm (L1 = r1 - 0.2 mm), in the Fig. 22E and Fig. 22F by 0.4 mm (L1 = r1 - 0.4 mm) and by 0.4 mm into the Fig. 22G and Fig. 22H (L1 = r1 - 0.4 mm) reduced.

[0076] To confirm the effects of the third and fourth embodiments, the following are described in the Fig. The cage shapes shown in sections 23A to 23H are used. Fig. 23A, Fig. 23C, Fig. 23E and Fig. 23G are top views, each showing part of a cage, and Fig. 23B, Fig. 23D, Fig. 23F and Fig. 23H are views that each show the part of the cage from the radially inner side. Fig. 23A and Fig. Figure 23B shows a cage 230 according to a comparative example, Fig. 23C and Fig. Figures 23D are an example and show cage 210 according to the third embodiment, which is described in the Fig. shown in 11 to 14, Fig. 23E and Fig. Figures 23F are an example and show cage 210 according to the modification of the third embodiment, which is described in Fig. 15 and Fig. 16 is shown, and Fig. 23G and Fig. Figures 23H are an example and show cage 210 according to the fourth embodiment, which is described in Fig. 17 to 20 is shown.

[0077] Unlike the examples of Fig. 23C to 23F is the case for cage 230 according to the comparative example of the Fig. 23A and Fig. 23B the distance L1 from the circumferential surface 211 of the pocket 203 to the center of the cage is set so that it is equal to the radius r1 of the inner circumferential surface 212 of the column section 202 (L1 = r1).

[0078] Referring to the example of Fig. 23A and Fig. 23B (L1 = r1) the distance L1 from the inner circumferential surface 211 of the pocket 203 to a center of the cage in Fig. 23C and Fig. 23D by 0.2 mm (L1 = r1 - 0.2 mm), in Fig. 23E and Fig. 23F by 0.4 mm (L1 = r1 - 0.4 mm) and in Fig. 23G and Fig. 23H reduced by 0.4 mm (L1 = r1 - 0.4 mm).

[0079] The dimensions of each cage were determined such that the inner circumferential radius r1 of the cage (the radius of the inner circumferential surface 212 of the column section 202) was 24.5 mm and the axial height was 10 mm. The material properties of each cage were defined by a modulus of elasticity of 7210 MPa, a Poisson's ratio of 0.4, and a density of 1.27 g / cm³. 3 The conditions were that the rotational speed of the cage was 15,000 rpm, while the rotational speed of the inner ring (rotary ring) was 38,000 rpm.

[0080] Sections (a) to (d) of Fig. Figure 24 shows a distribution of the maximum principal stress caused in the cages by the centrifugal force. The figures in sections (a) to (d) of Fig. The 24 cages shown correspond to those in Fig. 23A, Fig. 23C, Fig. 23E and Fig. 23G cages shown. In this case, one voltage value represented a relative value.

[0081] It is evident that in cage 230 of the comparative example of section (a) of Fig. 24 the greatest voltage is generated. On the other hand, it can be seen that in the cages 210 of sections (b), (c) and (d) of Fig. 24 the voltage generation compared to the cage 230 of section (a) of Fig. 24 is reduced.

[0082] Fig. Figure 25 shows the results of a relative comparison of a maximum value of a maximum principal stress caused by a centrifugal force in each in Fig. The cage shown in sections 21A to 23H is created.

[0083] In the examples of Fig. 21A to 21H in Fig. 25 is the maximum value of the maximum principal voltage that can be applied in cage 100 according to the prior art example, which is described in the Fig. 21A and Fig. 21B is shown, set to 1.0, and it is a ratio of the maximum value of the maximum main voltage that occurs in each of the Fig. The cages shown in section 21C to 21H are 110. As shown in Fig. As shown in Figures 21C to 21F, the stress ratios assume the values ​​0.92 and 0.88 when only pocket 103 is thickened towards the radial inner side, indicating that the stress is reduced. On the other hand, as shown in the Fig. 21G and Fig. 21H shows that the stress ratio has a value of 0.96 when the entire inner circumference of the cage is thickened by 120, which shows that there is only a small effect.

[0084] In the examples of Fig. 22A to 22H in Fig. 25 will be the maximum value of the maximum main voltage that will be present in cage 200 according to the [document / section]. Fig. 22A and Fig. The comparative example shown in 22B is set to 1.0, and it is a ratio of the maximum value of the maximum principal voltage that occurs in each of the Fig. The cages 210 and 220 shown at temperatures from 22C to 22H are depicted. As shown in Fig. As shown in Figures 22C to 22F, the stress ratios assume the values ​​0.90 and 0.86 when only the pocket 203 is thickened on the radially inner side, which shows that the stress is lower than when the entire inner circumference of the cage 220 is thickened, as in Fig. 22G and Fig. 22H shown (voltage ratio: 0.97).

[0085] In the examples of Fig. 23A to 23H in Fig. In section 25, the maximum value of the maximum main voltage shown in cage 230 according to the comparison example in 23A and 23B is set to 1.0, and a ratio of the maximum value of the maximum main voltage shown in each of the in Fig. The cages 210 shown, as depicted, are generated between 23C and 23H. Fig. As shown in 23C to 23H, the stress ratios take the values ​​0.91, 0.86 and 0.93 when only the pocket 203 is thickened on the radially inner side, which shows that there is a stress reduction effect.

[0086] Here, the stress caused by the centrifugal force acting on cage 210 is shown using the example of... Fig. 23G and Fig. 23H (fourth embodiment) is described. 26 is a cross-sectional view along a line AA of Fig. 23G. Fig. Figure 27 shows a stress distribution when a centrifugal force is applied, in the example of Fig. It occurs at 23H.

[0087] In Fig. In 27, the deformation of the cage is exaggerated by a factor of approximately 10.

[0088] As in Fig. As shown in Figure 26, the claw section 205 falls in the direction of an arrow D when a centrifugal force F acts on the cage 210. Fig. 26, where the annular main section 201 is the center point. Therefore, a point B on the side of the inner diameter of the pocket 203 moves towards the radially outer side, and a point C moves towards the radially inner side. As in Fig. As shown in Figure 27, point B experiences circumferential elongation and point C experiences circumferential contraction. Since the thickness of the lower section of pocket 203 is smallest, the highest circumferential tensile stress is generated in the section of point B. Since the stress in the examples of Fig. 23C to 23H compared to the example of the Fig. Since the stress can be reduced from 23C to 23H, it follows that the larger the cross-sectional area of ​​the thinnest part of the bottom of the pocket 203, the less likely it is that the claw section 205 will fall down, and the stress in the examples of the Fig. 23C to 23H can be compared to, for example, the Fig. 23A and Fig. 23B will be reduced. In the example of the Fig. 23G and Fig. In 23H, the volume of main section 201 is somewhat larger than in the examples of the Fig. 23C to 23F, however, a greater centrifugal force is applied and a stress (stress ratio: 0.93) is generated that is higher than in the examples of the Fig. 23C to 23F (voltage ratio: 0.91, 0.86).

[0089] Since the volume of main section 101 is larger than in the examples of the Fig. 21C to 21F, is similarly represented in the example of the Fig. 21G and Fig. 21H, a larger centrifugal force is applied and a stress (stress ratio: 0.96) is generated that is greater than that in the examples of the Fig. 21C to 21F (voltage ratio: 0.92, 0.88).

[0090] Since the volume of main section 201 is larger than in the examples of the Fig. 22C to 22F, is similarly represented in the example of the Fig. 22G and Fig. 22H applied a larger centrifugal force and generated a voltage (voltage ratio: 0.97) that is greater than that in the examples of the Fig. 21C to 21F (voltage ratio: 0.90, 0.86). (Example 2)

[0091] The stress generated in the claw section 205 is analyzed and calculated by the finite element method when the cage 210 without convex section 217 on the bottom surface 216 of the main section 201 and the cage 210 with the convex sections 217 on the bottom surface 216 of the main section 201 are installed in the bearing 1, which has the inner ring 3, the outer ring 5 and the balls 6.

[0092] Sections (a) and (b) of Fig. Figure 29 shows the analysis results of a strain distribution or stress distribution of the cages. Cage 210 of section (a) of Fig. 29 is the cage according to the modification of the second embodiment, which is described in Fig. 9 and Fig. Figure 10 shows no convex sections 217 on the base surface 216 of the main section 201. The cage 210 of section (b) of Fig. 29 is the cage according to the modification of the third embodiment, which is described in Fig. 15 and Fig. 16 is shown, and has the convex sections 217 on the base surface 216 of the main section 201.

[0093] The analysis showed, as in Fig. Figure 28 shows the model used in which part of the cage 210 was removed and the ball 6 was gradually pushed into position. In the actual bearing arrangement, the ball is fixed and the cage is moved, but in the present analysis, the model in which the cage is fixed and the ball is moved is used because the overall motion remains the same. The stress distribution and strain distribution, respectively, when the stress and strain are at their maximum at that time, are shown in sections (a) and (b) of Fig. 29 shown.

[0094] The maximum value of the claw section 205 of cage 210 of section (a) of the Fig. The generated voltage in 29 was 2.0%. On the other hand, the maximum value of the generated voltage in the claw section 205 of the cage 210 in (b) of the Fig. 29 1.8%, which is 10% lower than in the example in section (a) of the Fig. 29, which shows that the provision of the convex sections 217 has a stress-reducing effect.

[0095] This is because, as described in sections (a) and (b) of the Fig. Figure 29 shows that when the ball 6 is pressed into the pocket 203 of the cage 210, the claw section 205 expands circumferentially, with a section of low stiffness serving as the pivot point P. That is, it is assumed that the further the pivot point P is from the tip end section of the claw section 205, the wider a stress generation area D is, and since the generated strain is distributed, the maximum value is reduced.

[0096] In cage 210 according to section (b) of the Fig. 29 Modification of the third embodiment compared to cage 210 according to section (a) of the Fig. In the modification shown in Figure 29, the stress generation area D is widened and the maximum value of the stress or strain is further reduced as the distance from the tip end section of the claw section 205 to the pivot point P increases.

[0097] When the present invention is applied to a cage that uses a resin material such as polyamide 9T (PA9T) or polyamide 10T (PA10T) with a lower elongation than nylon 46 or nylon 66, the stress can be reduced.

[0098] The following content is revealed in the description provided. (1) A crown cage for a ball bearing has: a ring-shaped main section; several column sections projecting from the main section at predetermined intervals in an axial direction and circumferentially; and a pocket formed between the adjacent column sections, having a spherical concave surface with a spherical shape capable of holding a sphere, wherein the column section has two claw sections designed as a pair with tip end sections arranged at a distance between them, and a connecting section that joins the two claw sections, an inlet section with a width smaller than the diameter of the ball is provided for inserting the ball between the tip end sections of the two adjacent claw sections that form the pocket, and a distance from an inner circumferential surface of the pocket to a center of the crown cage for a ball bearing is smaller than a radius of an inner circumferential surface of the column section. (2) The crown cage for a ball bearing according to (1) in which a convex section projecting in the axial direction is provided on a bottom surface of the main section and at least one section of the convex section overlaps the pocket in the circumferential and radial directions. (3) The crown cage for a ball bearing according to (1) or (2), wherein the claw section projects in an axial direction from a radially inner side section of an upper surface of the main section and the upper surface of the main section is accessible from a radially outer side of the column section. (4) The crown cage for a ball bearing according to (3) in which an opening section open in the axial direction is provided between the adjacent pockets in the main section. (5) The crown cage for a ball bearing according to any one of points (1) to (4) wherein the inner circumferential surface of the pocket is a cylindrical surface projecting from the inner circumferential surface of the column section to a radially inner side. (6) A ball bearing has: an outer ring; an inner ring; several balls arranged between the outer ring and the inner ring; and the crown cage for a ball bearing according to one of points (1) to (5).

[0099] Although various embodiments are described above with reference to the drawings, the present invention is not limited to these examples. It is apparent to those skilled in the art that various variants or modifications can be conceived within the scope described in the claims, and it is understood that these variants or modifications fall within the technical scope of the present invention. Furthermore, the components in the above embodiments can be combined in any way within the scope of protection without deviating from the fundamental concept of the invention.

[0100] This application is based on a Japanese patent application (No. 2022-069471) filed on April 20, 2022, the contents of which are incorporated herein by reference. List of reference symbols 1 ball bearing 2 Inner ring raceway 3 inner ring 4 Outer ring track 5 outer ring 6 balls 7 Shielding plate 100, 110, 120 cage 101 Main Section 102 Column section 103 bags 104 spherical concave surface 105 Claw section 106 Entrance section 111 inner circumference of the bag 111a Connecting surface 111b convex surface 112 inner circumferential surface of the column section 113 Connecting section 201 Main Section 202 Column section 203 bags 204 spherical concave surface 205 Claw section 205b Circumferential area 205c second circumferential surface 206 Entrance section 200, 210, 220, 230 cage 211 inner circumferential area of ​​the bag 211a Connecting surface 211b convex surface 212 inner circumferential surface of the column section 213 Connecting section 213a Top 215 Opening section 216 Underside 217 convex section QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 5436204B

[0009] JP 2022-069471

[0100]

Claims

[1] A crown cage for a ball bearing, with: an annular main section; a plurality of column portions projecting in an axial direction at predetermined intervals in a circumferential direction from the main portion; and a pocket formed between the adjacent column sections and having a spherical concave surface with a spherical shape capable of holding a sphere, where: the column portion has two paired claw portions with tip end portions spaced therebetween, and a connecting portion connecting the two claw portions; an inlet portion having a width smaller than a diameter of the ball is provided for inserting the ball between the tip end portions of the two adjacent claw portions forming the pocket; and a distance from an inner peripheral surface of the pocket to a center of the crown cage for a ball bearing is smaller than a radius of an inner peripheral surface of the column portion. [2] The crown cage for a ball bearing according to claim 1, wherein: a convex portion projecting in the axial direction is provided on a bottom surface of the main portion; and at least a portion of the convex portion overlaps the pocket in the circumferential and radial directions. [3] The crown cage for a ball bearing according to claim 1, wherein: the claw portion projects axially from a radially inner side portion of an upper surface of the main portion; and the upper surface of the main section is accessible from a radially outer side of the column section. [4] The crown cage for a ball bearing according to claim 3, wherein an axially open opening portion is provided between the adjacent pockets in the main portion. [5] The crown cage for a ball bearing according to claim 1, wherein the inner peripheral surface of the pocket is a cylindrical surface projecting from the inner peripheral surface of the column portion to a radially inner side. [6] Ball bearings, with: an outer ring; an inner ring; a plurality of balls arranged between the outer ring and the inner ring; and the crown cage for a ball bearing according to one of claims 1 to 5.

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