Rolling bearing device

Abstract

In a rolling bearing device having a porous member located between two rows of rolling elements, the supplied lubricating oil is made more easily distributed throughout the porous member. [Solution] The rolling bearing device 1 is arranged so that its axial direction is vertical and includes an inner ring 4, an outer ring 5, two rows of rolling elements 5A and 5B positioned between the inner ring 4 and the outer ring 5, and a cylindrical porous member 8 positioned between the two rows of rolling elements 5A and 5B and capable of being impregnated with lubricating oil. The outer ring 5 has a mounting surface 18 on which the porous member 8 is mounted, an oil supply hole 28 that penetrates radially through a first portion 51 near the top of the outer ring 5, and an oil supply groove 55 provided on the mounting surface 18 that connects from the first portion 51 to a second portion 52 near the bottom of the outer ring 5.

Description

Technical Field

[0001] The present invention relates to a rolling bearing device.

Background Art

[0002] Patent Document 1 discloses a rolling bearing device in which a porous member is provided between an inner ring and an outer ring and between two rows of rolling element rows. The porous member holds a lubricating oil such as oil. The lubricating oil is used for lubricating the rolling bearing device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the case of the rolling bearing device disclosed in Patent Document 1, a through hole is provided in the axial center portion of the outer ring, and the lubricating oil is supplied to the porous member through the through hole. The supplied lubricating oil is applied to the porous member and penetrates and is held, but there are cases where it is difficult for the lubricating oil to reach the entire porous member (especially both axial sides). Therefore, an object of the present invention is to provide a rolling bearing device having a porous member located between two rows of rolling element rows, and in which the supplied lubricating oil easily reaches the entire porous member.

Means for Solving the Problems

[0005] The rolling bearing device of the present invention comprises an inner ring, an outer ring, two rows of rolling elements arranged between the inner ring and the outer ring, and a cylindrical porous member located between the two rows of rolling elements and capable of being impregnated with lubricating oil. The outer ring has a mounting surface on which the porous member is mounted, an oil supply hole that penetrates radially through a first portion near the top of the outer ring, and an oil supply groove provided on the mounting surface that connects from the first portion to a second portion near the bottom of the outer ring. [Effects of the Invention]

[0006] According to the rolling bearing device of the present invention, the lubricating oil spreads out as it flows through the oil supply groove and is supplied to the porous member, making it easier for the oil to spread throughout the entire porous member. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a cross-sectional view of a rolling bearing device. [Figure 2] Figure 2 is an enlarged cross-sectional view of a part of the rolling bearing device shown in Figure 1. [Figure 3] Figure 3 is a perspective view showing an example of a porous material. [Figure 4] Figure 4 is a cross-sectional view of the outer ring. [Figure 5] Figure 5 is a cross-sectional view of the outer ring. [Figure 6] Figure 6 is a cross-sectional view of the outer ring to show a modified example of the lubrication groove. [Modes for carrying out the invention]

[0008] <Overview of Embodiments> The embodiments of the present invention are outlined below. (1) A rolling bearing device according to an embodiment of the present invention is arranged so that its axial direction is vertical and comprises an inner ring, an outer ring, two rows of rolling elements arranged between the inner ring and the outer ring, and a cylindrical porous member located between the two rows of rolling elements and capable of being impregnated with lubricating oil. The outer ring has a mounting surface on which the porous member is attached, an oil supply hole that penetrates radially through a first portion near the top of the outer ring, and an oil supply groove provided on the mounting surface that connects from the first portion to a second portion near the bottom of the outer ring.

[0009] In the aforementioned rolling bearing device, an oil supply groove is provided on the mounting surface on the inner circumference of the outer ring, and this oil supply groove is located on the outer circumference side of the porous member. When lubricating oil supplied from the oil supply hole flows through the oil supply groove, it spreads at least axially (vertically) across the porous member and is supplied to the porous member. The lubricating oil is then easily distributed throughout the porous member.

[0010] (2) In the bearing device described in (1), the lubrication groove is provided on the mounting surface, extending in the axial and circumferential directions. The lubricating oil supplied through the oil supply hole spreads both axially and circumferentially to the porous member and is applied to the porous member.

[0011] (3) In the rolling bearing device of (1) or (2) above, the lubrication groove is a helical groove. The lubricating oil supplied through the oil supply hole flows along the helical oil supply groove, spreading in both the axial and circumferential directions of the porous member and being applied to the porous member.

[0012] (4) In any one of the rolling bearing devices described in (1) to (3) above, the oil supply hole is connected to the upper end of the oil supply groove, or is located above the oil supply groove. The lubricating oil supplied through the oil filler hole can flow along the oil filler groove, from top to bottom.

[0013] (5) In any one of the rolling bearing devices described in (1) to (4) above, the first portion has a first recessed groove on its inner circumference that is in the circumferential direction from which the lubrication hole opens, and the first recessed groove and the lubrication groove are connected. The lubricating oil supplied from the oil supply hole accumulates in the first concave groove. Since the first concave groove and the oil supply groove are connected, the lubricating oil accumulated in the first concave groove flows through the oil supply groove and spreads from the oil supply groove to be supplied to the porous member.

[0014] (6) In the rolling bearing device of (5) above, the oil supply groove has a plurality of axial grooves extending downward from the first concave groove. When the lubricating oil supplied from the oil supply hole flows along the first concave groove and the axial groove, it spreads in both the axial direction and the circumferential direction of the porous member and is supplied to the porous member.

[0015] (7) In the rolling bearing device of (3) above, the upper end portion of the spiral-shaped oil supply groove is located below the oil supply hole, and the lower end portion of the oil supply groove is located at a position opposite to the oil supply hole in the circumferential direction. The lubricating oil supplied from the oil supply hole is easily taken into the spiral-shaped oil supply groove. The lubricating oil that has flowed to the lower end portion of the oil supply groove reaches a position away from the oil supply hole in both the axial direction and the circumferential direction. The lubricating oil supplied from the oil supply hole spreads in both the axial direction and the circumferential direction of the porous member and is supplied to the porous member.

[0016] <Details of Embodiments of the Present Invention> [Overall Configuration of Rolling Bearing Device] FIG. 1 is a cross-sectional view of a rolling bearing device. The rolling bearing device 1 shown in FIG. 1 (hereinafter referred to as "bearing device 1") rotatably supports a shaft 92 with respect to a housing 91. The direction of the center line of the shaft 92 is the vertical direction. Therefore, the direction of the center line C of the bearing device 1 is also the vertical direction. FIG. 1 shows a cross-section (vertical cross-section) including the center line C of the bearing device 1.

[0017] The bearing device 1 includes an outer ring 2, an inner ring 4, upper and lower two rows of rolling element rows 5A and 5B arranged between the outer ring 2 and the inner ring 4, and a cylindrical porous member 8. The rolling elements in this embodiment are balls 6. Between the outer ring 2 and the inner ring 4, an upper rolling element row 5A is formed by a plurality of balls 6 located above, and a lower rolling element row 5B is formed by a plurality of balls 6 located below. The porous member 8 is located between the two rows of rolling element rows 5A and 5B.

[0018] The center line of the inner ring 4 and the center line of the outer ring 2 coincide, and these center lines become the center line C of the bearing device 1. The direction parallel to the center line C is defined as the axial direction. The direction orthogonal to the center line C is defined as the radial direction. The direction along the circle centered on the center line C is defined as the circumferential direction. In the axial direction, the upward direction is defined as the first axial direction, and the downward direction is defined as the second axial direction.

[0019] The outer ring 2 and the inner ring 4 are cylindrical members made of steel materials such as bearing steel or steel for mechanical structures. The outer ring 2 has upper and lower outer ring raceways 2b, 2b on its inner peripheral surface 2a where the balls 6 of the upper and lower rolling element rows 5A, 5B respectively contact. The outer ring 2 is fixed to the inner peripheral cylindrical surface of the housing 91. The inner ring 4 has upper and lower inner ring raceways 4b, 4b on its outer peripheral surface 4a where the balls 6 of the upper and lower rolling element rows 5A, 5B respectively contact. The inner ring 4 is fixed to the outer diameter cylindrical surface of the shaft 92. The upper opening between the outer ring 2 and the inner ring 4 is sealed by an annular upper seal member 10. The lower opening between the outer ring 2 and the inner ring 4 is sealed by an annular lower seal member 12.

[0020] The balls 6 are members made of steel materials such as bearing steel. The plurality of balls 6 included in the upper rolling element row 5A are interposed between the upper outer ring raceway 2b and the upper inner ring raceway 4b. The plurality of balls 6 included in the lower rolling element row 5B are interposed between the lower outer ring raceway 2b and the lower inner ring raceway 4b. The bearing device 1 has a pair of upper and lower cages 7. The pair of cages 7 hold the balls 6 included in the two rolling element rows 5A, 5B respectively at equal intervals in the circumferential direction.

[0021] The porous member 8 has a shape in which its outer peripheral surface 8a and inner peripheral surface 8d respectively follow a cylinder. The porous member 8 has a long slit 32 in the axial direction but has a shape along a cylinder centered on the center line C. The porous member 8 is located between the outer ring 2 and the inner ring 4 and between the upper and lower two rolling element rows 5A, 5B.

[0022] The slit 32 of the porous member 8 shown in Figure 1 is long in the axial direction and has a straight shape. The shape of the slit 32 in the porous member 8 may be other. Figure 3 is a perspective view showing an example of the porous member 8. For example, as shown in Figure 3, the slit 32 has a first slit 41 located on the upper side of the porous member 8 and a second slit 42 located on the lower side of the porous member 8. The first slit 41 and the second slit 42 are located at different circumferential positions and are connected through a third slit 43 that extends in the circumferential direction.

[0023] In Figure 1, the outer circumferential surface 8a of the porous member 8 contacts a portion of the inner circumferential surface 2a of the outer ring 2 (the second inner circumferential surface portion 18). To attach the porous member 8 to the inner side of the outer ring 2, the worker elastically deforms the porous member 8 to reduce its diameter. Subsequently, the porous member 8 expands in diameter due to its elastic restoring force, and the porous member 8 is attached in a state of close contact with the outer ring 2. The porous member 8, having a slit 32, easily undergoes elastic deformation and reduces in diameter. The porous member 8 then expands in diameter from its reduced state and is mounted on the outer ring 2. For this reason, the diameter of the outer peripheral surface 8a of the porous member 8 in its free state is larger than the inner diameter of a portion of the inner peripheral surface 2a of the outer ring 2 (the second inner peripheral surface portion 18).

[0024] The porous member 8 is formed from a porous material that can be impregnated with lubricating oil. This lubricating oil is used to lubricate the bearing device 1. Examples of porous materials include PVA (polyvinyl alcohol) sponge and polyethylene sponge. In addition to being able to be impregnated with lubricating oil, PVA sponge and polyethylene sponge deteriorate less over time than urethane sponge and can be used for a long period of time.

[0025] The inner circumferential surface 2a of the outer ring 2 has a first inner circumferential surface portion 16, a second inner circumferential surface portion 18, a third inner circumferential surface portion 20, a first groove 22, and a second groove 24. The first inner circumferential surface portion 16 is the upper end portion of the inner circumferential surface 2a of the outer ring 2. The first inner circumferential surface portion 16 includes the upper outer ring raceway 2b. The third inner circumferential surface portion 20 is the lower end portion of the inner circumferential surface 2a of the outer ring 2. The third inner circumferential surface portion 20 includes the lower outer ring raceway 2b. The second inner circumferential surface portion 18 is located between the first inner circumferential surface portion 16 and the third inner circumferential surface portion 20. The outer circumferential surface 8a of the porous member 8 is in contact with the second inner circumferential surface portion 18. In other words, the second inner circumferential surface portion 18 is the mounting surface into which the porous member 8 is mounted in contact.

[0026] The first groove 22 in this embodiment is a groove that is continuous in the circumferential direction and is an annular groove. Hereinafter, the first groove 22 will be referred to as the "first annular groove 22" and described accordingly. The first annular groove 22 is located between the first inner circumferential surface portion 16 and the second inner circumferential surface portion 18. The first annular groove 22 is recessed radially outward relative to the first inner circumferential surface portion 16 and the second inner circumferential surface portion 18. The second groove 24 in this embodiment is a groove that is continuous in the circumferential direction and is an annular groove. Hereinafter, the second groove 24 will be referred to as the "second annular groove 24" and described accordingly. The second annular groove 24 is located between the second inner circumferential surface portion 18 and the third inner circumferential surface portion 20. The second annular groove 24 is recessed radially outward relative to the second inner circumferential surface portion 18 and the third inner circumferential surface portion 20.

[0027] Figure 2 is an enlarged cross-sectional view of a part of the bearing device 1 shown in Figure 1. The inner diameter D18 of the second inner circumferential surface portion 18 of the outer ring 2 is larger than the inner diameter D16 of the first inner circumferential surface portion 16 and the inner diameter D20 of the third inner circumferential surface portion 20. The second inner circumferential surface portion 18 is recessed radially outward relative to the first inner circumferential surface portion 16 and the third inner circumferential surface portion 20.

[0028] The first annular groove 22 has an upper annular wall 22a, a lower annular wall 22b, and a bottom surface 22c. The upper annular wall 22a is a wall portion that extends radially inward from the upper edge of the bottom surface 22c. The inner periphery of the upper annular wall 22a connects to the lower end edge of the first inner circumferential surface portion 16. The upper annular wall 22a has an annular wall portion 22a1 that protrudes radially inward from the second inner circumferential surface portion 18. The lower annular wall 22b is a wall portion that extends radially inward from the lower edge of the bottom surface 22c. The inner periphery of the lower annular wall 22b connects to the first end edge 18a of the second inner circumferential surface portion 18. The first end edge 18a is the upper end edge of the second inner circumferential surface portion 18.

[0029] The second annular groove 24 has an upper annular wall 24a, a lower annular wall 24b, and a bottom surface 24c. The upper annular wall 24a is a wall portion that extends radially inward from the upper edge of the bottom surface 24c. The inner periphery of the upper annular wall 24a connects to the second end edge 18b of the second inner circumferential surface portion 18. The second end edge 18b is the axially lower end edge of the second inner circumferential surface portion 18. The lower annular wall 24b is a wall portion that extends radially inward from the lower edge of the bottom surface 22c. The inner circumferential edge of the lower annular wall 22b connects to the upper end edge of the third inner circumferential surface portion 20. The lower annular wall 24b has an annular wall portion 24b1 that protrudes radially inward from the second inner circumferential surface portion 18. In this embodiment, the inner diameter of the annular wall portion 24b1 is the same as the inner diameter D20 of the third inner circumferential surface portion 20.

[0030] A portion of the upper end face 8b of the porous member 8 faces the annular wall portion 22a1 located axially upward. A portion of the lower end face 8c of the porous member 8 faces the annular wall portion 24b1 located axially downward. The porous member 8 is provided in the range between the upper annular wall portion 22a1 and the lower annular wall portion 24b1 in the axial direction. The end faces 8b and 8c of the porous member 8 may be in contact with the annular wall portions 22a1 and 24b1. The axial movement of the porous member 8 is restricted by the annular wall portions 22a1 and 24b1.

[0031] As described above, the inner circumferential surface 2a of the outer ring 2 has a second inner circumferential surface portion 18 that contacts the outer circumferential surface 8a of the porous member 8, and an annular wall portion 24b1 located below the second inner circumferential surface portion 18. The inner diameter (D20) of the annular wall portion 24b1 is smaller than the inner diameter D18 of the second inner circumferential surface portion 18. With this configuration, even if the porous member 8 is displaced downwards, it will come into contact with the annular wall portion 24b1, limiting the displacement.

[0032] The porous member 8 is positioned to cover almost the entirety of the first annular groove 22 and almost the entirety of the second annular groove 24. An annular space K1 is provided between the first annular groove 22 and the outer circumferential surface 8a of the porous member 8. An annular space K2 is provided between the second annular groove 24 and the outer circumferential surface 8a of the porous member 8.

[0033] The spaces between the two rows of rolling elements 5A and 5B and the porous member 8 are grease regions G1 and G2. Grease, a semi-solid lubricant, is loaded into each of the upper and lower grease regions G1 and G2. The grease contains a base oil, a thickener, and additives. The upper grease region G1 is adjacent to the upper outer ring raceway 2b and rolling element row 5A. The lower grease region G2 is adjacent to the lower outer ring raceway 2b and rolling element row 5B.

[0034] The base oil of the grease in the upper grease region G1 is supplied to the rolling element row 5A through the upper outer ring raceway 2b. The base oil of the grease in the lower grease region G1 is supplied to the rolling element row 5B through the lower outer ring raceway 2b. The upper and lower grease regions G1 and G2 are adjacent to the porous member 8, and the grease in each of the grease regions G1 and G2 may be in contact with the porous member 8.

[0035] The outer ring 2 has an oil supply hole 28. The oil supply hole 28 is a hole that penetrates radially from the outer circumferential surface 2c of the outer ring 2 to the inner circumferential surface 2a. The oil supply hole 28 opens on the inner circumferential surface 2a between the upper and lower outer ring raceways 2b, 2b. In this embodiment, the oil supply hole 28 penetrates radially through the upper first portion 51 of the outer ring 2. The oil supply hole 28 opens at the bottom surface 22c of the first annular groove 22. The oil supply hole 28 is a hole for supplying lubricating oil from the outside of the bearing device 1 to the inside of the bearing device 1. The lubricating oil is supplied to the inside of the bearing device 1 (porous member 8) through the oil supply hole 28. The lubricating oil is the base oil of the grease.

[0036] Thus, the outer ring 2 has a second inner circumferential surface portion 18 which serves as the mounting surface for the porous member 8, and an oil supply hole 28 that penetrates radially through the first portion 51 near the top of the outer ring 2. Hereafter, the second inner circumferential surface portion 18 will be referred to as the "mounting surface 18" and described accordingly. The outer ring 2 further has a lubrication groove 55 provided on the mounting surface 18. The lubrication groove 55 is a groove that connects from the first portion 51 to the second portion 52 located near the bottom of the outer ring 2.

[0037] The first part 51 is the portion of the outer ring 2 adjacent to the upper side of the mounting surface 18. The second part 52 is the portion of the outer ring 2 adjacent to the lower side of the mounting surface 18. The first part 51 has a first annular groove 22 on its inner circumference. The second part 52 has a second annular groove 24 on its inner circumference.

[0038] [Regarding the fuel filler groove 55] Figure 4 is a cross-sectional view of the outer ring 2, and is a cross-sectional view taken from a plane that is 90 degrees different from the cross-section shown in Figure 1, with respect to the center line C. Figures 1 and 2 show cross-sections taken from the plane that cuts through the oil supply hole 28, whereas Figure 4 shows a cross-section taken from the plane in which the oil supply hole 28 is visible from the front. Figure 5 is a cross-sectional view of the outer ring 2, and is a cross-sectional view taken from a plane that is 180 degrees different from the cross-section shown in Figure 4, with respect to the center line C.

[0039] The lubrication groove 55 shown in Figures 4 and 5 is a helical groove. The lubrication groove 55 is a groove provided in a helical shape with the center line C as the center, and is provided over the entire axial direction of the mounting surface 18. Since the first annular groove 22 is provided on the upper side of the mounting surface 18 and adjacent to it in the axial direction, the lubrication groove 55 and the first annular groove 22 are connected. Since the second annular groove 24 is provided on the lower side of the mounting surface 18 and adjacent to it in the axial direction, the lubrication groove 55 and the second annular groove 24 are connected. The first annular groove 22, the lubrication groove 55, and the second annular groove 24 are formed in the order of first annular groove 22, lubrication groove 55, and second annular groove 24, from the upper side in the axial direction to the lower side in the axial direction.

[0040] The lubrication groove 55 provided on the mounting surface 18 is located on the outer circumference side of the porous member 8. Therefore, the lubricating oil supplied from the lubrication hole 28 flows through the lubrication groove 55 and is supplied to the porous member 8. As a result, the lubricating oil spreads in the axial and circumferential directions of the porous member 8 and is applied to the porous member 8. The lubrication groove 55 makes it easier for the lubricating oil to spread throughout the entire porous member 8.

[0041] As shown in Figure 2, the upper part 81 of the porous member 8 faces the bottom surface 22c of the first annular groove 22. Therefore, the lubricating oil supplied from the oil supply hole 28 temporarily accumulates in the first annular groove 22 (annular space K1). Specifically, the lubricating oil accumulates between the upper part 81 of the porous member 8 and the bottom surface 22c of the first annular groove 22. The upper end 551 of the lubrication groove 55 (see Figure 4) is open at the first annular groove 22, and as described above, the first annular groove 22 and the lubrication groove 55 are connected. Therefore, the lubricating oil that accumulates in the first annular groove 22 then flows into the lubrication groove 55 located axially below the first annular groove 22, spreads out from the lubrication groove 55, and is supplied to the porous member 8.

[0042] In this way, the lubricating oil supplied from the oil supply hole 28 is stored in the first annular groove 22, then flows into the oil supply groove 55, where it flows and spreads in a spiral pattern before being supplied to the porous member 8. As shown in Figure 2, the lower part 82 of the porous member 8 faces the bottom surface 24c of the second annular groove 24. The lower end 552 of the lubrication groove 55 (see Figure 5) opens at the second annular groove 24, and the lubrication groove 55 and the second annular groove 24 are connected. Therefore, the lubricating oil that flows through the helical lubrication groove 55 accumulates in the second annular groove 24. Specifically (see Figure 2), the lubricating oil accumulates between the lower part 82 of the porous member 8 and the bottom surface 24c of the second annular groove 24 (and the grease area G2).

[0043] As shown in Figure 4, the upper end 551 of the helical lubrication groove 55 is located below the lubrication hole 28. In other words, the upper end 551 of the lubrication groove 55 and the lubrication hole 28 are in different positions in the axial direction, but are in the same position in the circumferential direction. The upper end 551 is the starting point of the helical lubrication groove 55. As shown in Figure 5, the lower end 552 of the helical oil supply groove 55 is located opposite the oil supply hole 28 in the circumferential direction. The lower end 552 is the end point of the helical oil supply groove 55.

[0044] Because the upper end 551 of the lubrication groove 55 is located directly below the lubrication hole 28, the lubricating oil supplied from the lubrication hole 28 is easily taken into the helical lubrication groove 55. The lubricating oil that flows down to the lower end 552 of the lubrication groove 55 then reaches a position away from the lubrication hole 28 in both the axial and circumferential directions. As a result, the lubricating oil supplied from the lubrication hole 28 spreads in both the axial and circumferential directions of the porous member 8 and is supplied to the porous member 8.

[0045] In this embodiment, the depth of the lubrication groove 55 is constant along the longitudinal direction (along the spiral) of the groove. The first annular groove 22 is deeper than the lubrication groove 55. The second annular groove 24 is deeper than the lubrication groove 55.

[0046] Figure 6 is a cross-sectional view of the outer ring 2 to show a modified example of the oiling groove 55. Like Figure 4, Figure 6 shows a cross-section of the surface where the oiling hole 28 is visible from the front. The configuration shown in Figure 6 is the same as the configuration shown in Figure 4, except that the oiling groove 55 is different. In the case of the outer ring 2 shown in Figure 6, its lubrication groove 55 is composed of a plurality of axial grooves 57 extending downward from the first annular groove 22.

[0047] The axial groove 57 is provided along the axial direction on the mounting surface 18 and is a groove that extends from the first annular groove 22 to the lower end 182 of the mounting surface 18. The axial groove 57 opens at the second annular groove 24 and connects with the second annular groove 24.

[0048] Even in the case of the oil supply groove 55 shown in Figure 6, the lubricating oil supplied from the oil supply hole 28 flows along the first annular groove 22 and the axial groove 57, spreading in both the axial and circumferential directions of the porous member 8 and being supplied to the porous member 8. In the configuration shown in Figure 6, the axial groove 57 is a straight groove parallel to the center line C, but the axial groove 57 may be inclined with respect to a virtual straight line on the mounting surface 18 that is parallel to the center line C. Also, the axial groove 57 may be a curved groove rather than a straight groove.

[0049] In the configurations shown in Figures 4 and 5, and in the configuration shown in Figure 6, the lubrication groove 55 is provided on the mounting surface 18, extending in both the axial and circumferential directions. As a result, the lubricating oil supplied from the lubrication hole 28 spreads in both the axial and circumferential directions of the porous member 8 and is applied to the porous member 8.

[0050] In the configurations shown in Figures 4 and 5, and in the configuration shown in Figure 6, the oil supply hole 28 is located above the oil supply groove 55. The lubricating oil supplied from the oil supply hole 28 can reliably flow along the oil supply groove 55, from top to bottom. Alternatively, although not shown in the diagram, the oil supply hole 28 may be connected to the upper end of the oil supply groove 55. Referring to Figure 2, for example, the oil supply hole 28 may open at a position in contact with the lower annular wall 22b of the first annular groove 22.

[0051] 〔others〕 The embodiments disclosed are illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments described above and includes all modifications within the scope equivalent to the configurations described in the claims. [Explanation of symbols]

[0052] 1. Rolling bearing device 2 Outer ring 4. Inner Ring 5A,5B Rolling element row 6 balls 8 Porous material 18 Mounting surface (second inner peripheral surface) 22 First annular groove (first concave groove) 22c bottom 24. Second annular groove (second concave groove) 28 Fuel filler port 51 Part 1 52 Part 2 55 Fueling groove 56 Circumferential groove 57 Axial groove 81 Top 82 Lower part 551 Upper end 552 Lower end

Claims

1. They are arranged so that the axis is in the vertical direction. It comprises an inner ring, an outer ring, two rows of rolling elements positioned between the inner ring and the outer ring, and a cylindrical porous member located between the two rows of rolling elements and capable of being impregnated with lubricating oil. The aforementioned outer ring is The mounting surface on which the porous member is attached, The first portion of the outer ring near the top has an oil supply hole that penetrates radially, A lubrication groove is provided on the mounting surface and extends from the first portion to the second portion lower to the outer ring, Having, Rolling bearing device.

2. The rolling bearing device according to claim 1, wherein the lubrication groove is provided on the mounting surface, extending in the axial and circumferential directions.

3. The aforementioned fueling groove is a spiral groove. A rolling bearing device according to claim 1 or claim 2.

4. The rolling bearing device according to claim 1 or claim 2, wherein the oil supply hole is connected to the upper end of the oil supply groove, or is located above the oil supply groove.

5. The first portion has a first recessed groove on its inner circumference that is aligned in the circumferential direction and through which the oil supply hole opens, and the first recessed groove and the oil supply groove are connected. A rolling bearing device according to claim 1 or claim 2.

6. The rolling bearing device according to claim 5, wherein the lubrication groove has a plurality of axial grooves extending downward from the first recessed groove.

7. The upper end of the spiral-shaped oil supply groove is located below the oil supply hole, The lower end of the oil supply groove is located opposite the oil supply hole in the circumferential direction. The rolling bearing device according to claim 3.

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