Ball bearing with S-shaped cooling structure and bearing cooling and lubricating method

Abstract

The invention relates to the technical field of aero-engine bearing cooling, in particular to a ball bearing with an S-shaped cooling structure and a bearing cooling and lubricating method. Comprising a bearing inner ring, a bearing outer ring, a retainer and a plurality of balls, the bearing inner ring, the bearing outer ring and the retainer are coaxially arranged in the bearing, the balls are circumferentially distributed on the retainer, a plurality of S-shaped cooling flow channels which are not communicated with one another are arranged in the bearing outer ring, and through the S-shaped cooling flow channels arranged in the bearing outer ring, independent cooling and heat exchange of the ball bearing outer ring can be achieved; the situation that the outer ring of the ball bearing is insufficiently cooled in a traditional cooling scheme is effectively improved, so that the consumption of sprayed cooling lubricating oil is remarkably reduced, the viscous friction loss of lubricating oil in a bearing cavity is reduced, efficient cooling of the interior of the bearing is achieved, and the service life of the bearing is further prolonged. And meanwhile, the multiple S-shaped cooling flow channels which are not communicated with one another can effectively reduce fluid pressure loss. According to the method, the temperature of the bearing structure can be effectively controlled, meanwhile, the viscous friction loss of the bearing fluid is reduced, and efficient cooling of the interior of the bearing is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of cooling of aircraft engine bearings, and in particular to a ball bearing with an S-shaped cooling structure and a bearing cooling and lubricating method. Background Art

[0002] High-speed rolling bearings in aircraft engines require lubrication and cooling with lubricating oil. In actual operation, only a very small amount of lubricating oil inside the bearing will enter the contact area to form a lubricating oil film, and most of the other lubricating oil is mainly used for cooling, and the heat generated by the bearing is carried away through convection heat transfer.

[0003] At present, the existing bearing cooling methods have developed from traditional single jet lubrication to under-ring lubrication or under-ring / jet combined lubrication. Both cooling methods are "lubricating oil outflow cooling", where the lubricating oil flows through the surface of the bearing parts and cools the bearings through convective heat transfer. Among them, under-ring lubrication is a lubrication method that sends lubricating oil into the bearing through the oil supply hole of the inner ring of the bearing. Compared with jet lubrication, under-ring lubrication has better lubrication and cooling effects. However, both under-ring lubrication and jet lubrication will cause large-scale retention of lubricating oil liquid in the bearing cavity. When the rolling element runs at high speed in this oil environment, it will produce significant fluid viscous friction such as oil stirring and dragging, which will increase the heat generation of the bearing and increase the cooling and heat transfer load. As advanced engines develop towards high intake temperature and high turbine pre-gas temperature, the ultra-high temperature and gas environment faced by bearings have seriously exceeded the current tolerance; at the same time, the variable operating conditions of variable cycle engines, the improvement of thrust-to-weight ratio, and the control of rotor vibration require the development of revolutionary new bearing structures and cooling solutions.

[0004] In response to the above situation, Germany's MTU Engine Company has developed an "external ring cooling technology". The lubricating oil that enters the bearing through the oil supply hole under the ring is mainly used to meet the cooling and lubrication of the inner ring and rolling elements. The outer ring cooling is completed by the oil supply channel surrounded by the outer diameter surface of the outer ring. This part of the lubricating oil does not enter the inside of the bearing, so the lubricating oil flow entering the bearing can be appropriately reduced, thereby reducing the fluid viscous friction loss of the bearing. However, the defect of this technology is that the lubricating oil groove for the separate cooling of the outer ring is arranged on the outer diameter surface of the outer ring, resulting in the inability to effectively control the bearing structure temperature. At the same time, the bearing fluid viscous friction loss is high, that is, the bearing cooling and lubrication effect is not ideal. The invention patent "A ball bearing with a cooling structure and a bearing cooling and lubrication method" (patent number CN202210177014.5) discloses a ball bearing with a cooling structure and a bearing cooling and lubrication method. The ball bearing includes a ball bearing inner ring, a retaining frame and a ball bearing outer ring arranged in sequence from the inside to the outside. The interior of the ball bearing outer ring is provided with a multi-channel annular cooling channel. During the research process, the fluid pressure loss of this structure is relatively large. The S-shaped cooling structure proposed in the present invention has multiple S-shaped cooling channels that are not interconnected, including multiple cooling lubricating oil inlets and multiple cooling lubricating oil outlets, which can reduce the fluid pressure loss. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and to provide a ball bearing with an S-shaped cooling structure and a bearing cooling and lubrication method. The present invention solves the technical problems in the prior art that the bearing cooling and lubrication effect is not ideal and the fluid pressure loss in the cooling channel is large by setting a plurality of S-shaped cooling channels that are not connected to each other.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the ball bearing with an S-shaped cooling structure comprises a bearing inner ring, a bearing outer ring, a retaining frame and a plurality of balls arranged circumferentially on the retaining frame coaxially arranged in the bearing, the interior of the bearing outer ring is provided with a plurality of S-shaped cooling channels that are not interconnected, and each S-shaped cooling channel is provided with a corresponding cooling channel lubricating oil inlet and cooling channel lubricating oil outlet; the bearing inner ring is provided with an inner ring oil supply hole for supplying oil to the balls.

[0007] The radial cross-section of the S-shaped cooling channel is circular, and the multiple S-shaped cooling channels that are not interconnected are centrally symmetrically distributed relative to the outer ring of the bearing. The centerline spacing between two adjacent sections of the S-shaped cooling channel parallel to the axial direction is s1, and the centerline spacing between the inlet and outlet of adjacent S-shaped cooling channels is 2h, satisfying 2h=s1.

[0008] In the described S-shaped cooling channel, the diameter of the cross-sectional circle is d, the centerline spacing between two adjacent straight sections parallel to the axial direction is s1, the centerline spacing between two straight sections perpendicular to the axial direction is s2, the centerline arc radius at the turning of adjacent parallel and perpendicular axial channels is r, and the width of the bearing outer ring is W. The following relationships hold among the dimensional parameters: d + s2 < W, and the value range of s2 is [2d, 8d], and the value range of r is [d, 2d].

[0009] The centerline of the described S-shaped cooling channel is tangent to a cylindrical surface coaxial with the bearing outer ring. The diameter of the cylindrical surface is D2. The following relationships hold among the diameter d of the cross-sectional circle of the S-shaped cooling channel, the outer diameter D1 of the bearing outer ring, the diameter D2 of the cylindrical surface, the bottom diameter D3 of the bearing outer ring groove, and the inner diameter D4 of the bearing outer ring: D1 > D2 + d > D2 - d > D3 > D4.

[0010] The relationship of the structural parameters of the described S-shaped cooling channel is as follows: Taking the area between adjacent parallel and perpendicular axial channels as one turn, and taking the through cooling channel with an independent corresponding cooling channel lubricating oil inlet and cooling channel lubricating oil outlet as one S-shaped cooling channel. The number of turns of each S-shaped cooling channel is n, and the number of S-shaped cooling channels in the bearing outer ring is m. Starting from the first S-shaped cooling channel, in clockwise order, it is named the second S-shaped cooling channel in turn until the mth S-shaped cooling channel. The following relationships hold among the dimensional parameters of the S-shaped cooling channel , and m ≥ 2.

[0011] The width W of the described ball bearing outer ring, the outer diameter D1 of the ball bearing outer ring, the bottom diameter D3 of the bearing outer ring groove, and the inner diameter D4 of the bearing outer ring conform to the conventional aero-engine bearing dimensional parameters. The value range of D1 is [4.5W, 5.3W], the value range of D3 is [4.2W, 4.8W], and the value range of D4 is [4W, 4.8W].

[0012] The described cooling channel lubricating oil inlet includes the first S-shaped cooling channel lubricating oil inlet, the second S-shaped cooling channel lubricating oil inlet, up to the mth S-shaped cooling channel lubricating oil inlet; the described cooling channel lubricating oil outlet includes the first S-shaped cooling channel lubricating oil outlet, the second S-shaped cooling channel lubricating oil outlet, up to the mth S-shaped cooling channel lubricating oil outlet; the first S-shaped cooling channel lubricating oil outlet and the second S-shaped cooling channel lubricating oil inlet are adjacent; the (m - 1)th S-shaped cooling channel lubricating oil outlet and the mth S-shaped cooling channel lubricating oil inlet are adjacent.

[0013] A bearing cooling and lubricating method with an S-shaped cooling structure is characterized in that cooling lubricating oil is introduced into the bearing outer ring of the S-shaped cooling structure to achieve cooling and lubrication. The specific steps are as follows: Step 1: The cooling lubricating oil enters the S-shaped cooling channel through the cooling channel lubricating oil inlet on the bearing outer ring, and the cooling lubricating oil entering the S-shaped cooling channel flows out from the corresponding cooling channel lubricating oil outlet, thereby completing the cooling and lubrication of the ball bearing outer ring; Step 2: Pass the cooling lubricating oil into the ball bearing with an S-shaped cooling structure through the inner ring oil supply hole. The cooling lubricating oil flows through the bearing inner ring, retaining frame and balls to complete the cooling and lubrication of the bearing inner ring, retaining frame and balls.

[0014] The initial temperature of the cooling lubricating oil is 300K-350K, and the heat flux density is 100000W / m 2 ~200000W / m 2 , the oil supply flow rate is 1L / min~5L / min.

[0015] Furthermore, the initial temperature of the cooling lubricating oil is 323.15K, and the heat flux density is 150000W / m 2 , the oil supply flow rate is 1.5L / min.

[0016] The present invention has the effect of the above technical solution that the ball bearing and the bearing cooling and lubrication method with an S-shaped cooling structure can realize separate cooling and heat exchange of the outer ring of the ball bearing through the S-shaped cooling channel arranged inside, effectively improving the situation that the traditional cooling scheme does not cool the outer ring of the ball bearing enough, thereby significantly reducing the amount of sprayed cooling lubricating oil, reducing the viscous friction loss of the lubricating oil in the bearing cavity, achieving efficient cooling inside the bearing, and thus increasing the service life of the bearing. At the same time, multiple S-shaped cooling channels that are not connected to each other can effectively reduce fluid pressure loss. This method can effectively control the temperature of the bearing structure and reduce the viscous friction loss of the bearing fluid, that is, achieving efficient cooling inside the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An axial cross-sectional view of a ball bearing with an S-shaped cooling structure according to the present invention; Figure 2 It is a radial cross-sectional view of a ball bearing with an S-shaped cooling structure of the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the circumferential development of an S-shaped cooling channel; Figure 4 For the present invention Figure 1 Schematic diagram of local parameters of the center line of an S-shaped cooling channel; Figure 5 It is a structural schematic diagram of the S-shaped cooling channel of the present invention; Figure 6 It is a schematic diagram of the structure of the outer ring of the ball bearing of the present invention; Figure 7 It is a diagram showing the relationship between the fluid pressure loss of the S-shaped cooling structure and the multi-channel annular cooling structure of the present invention and the oil supply flow rate.

[0018] In the figure, 1 is the bearing; 101 is the inner ring of the bearing; 102 is the cage; 103 is the outer ring of the bearing; 104 is the ball; 105 is the inner ring oil supply hole; 106 is the S-shaped cooling channel; 107 is the lubricating oil inlet of the first S-shaped cooling channel; 108 is the lubricating oil outlet of the first S-shaped cooling channel; 109 is the lubricating oil inlet of the second S-shaped cooling channel; 110 is the lubricating oil outlet of the second S-shaped cooling channel; 111 is the cylindrical surface. Specific embodiments

[0019] The principles and features of the present invention will be described below with reference to the accompanying drawings; the examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] To achieve the above object, the present invention provides the following specific embodiments: As Figure 1 shown, a ball bearing with an S-shaped cooling structure includes an inner ring 101, an outer ring 103, a cage 102 coaxially arranged inside the bearing 1, and a plurality of balls 104 circumferentially arranged on the cage 102. The feature is that a plurality of non-interconnected S-shaped cooling channels 106 are arranged inside the outer ring 103 of the bearing, and each S-shaped cooling channel is provided with a corresponding cooling channel lubricating oil inlet and a cooling channel lubricating oil outlet; an inner ring oil supply hole 105 for supplying oil to the balls 104 is provided through the inner ring 101 of the bearing.

[0021] As Figure 2 、 3 and shown in FIG. 4, the radial cross-section of the S-shaped cooling channel 106 is circular, the plurality of non-interconnected S-shaped cooling channels are centrally symmetrically distributed relative to the outer ring 103 of the bearing, the center line distance between adjacent two sections of the flow channel parallel to the axial direction in the S-shaped cooling channel 106 is s1, and the center line distance between the inlets and outlets of adjacent S-shaped cooling channels is 2h, satisfying 2h = s1.

[0022] The diameter of the cross-sectional circle in the S-shaped cooling channel 106 is d, the center line distance between adjacent two straight sections of the flow channel parallel to the axial direction is s1, the center line distance between two straight sections of the flow channel perpendicular to the axial direction is s2, the center line arc radius of the flow channel turning at the adjacent parallel axial and perpendicular axial directions is r, the width of the outer ring 103 of the bearing is W, and the following relationships are satisfied among the various dimensional parameters: d + s2 < W, and the value range of s2 is [2d, 8d], and the value range of r is [d, 2d].

[0023] The center line of the S-shaped cooling channel 106 is tangent to a cylindrical surface 111 coaxial with the bearing outer ring. The cylindrical surface is a cylindrical surface of equal diameter or a cylindrical surface with convexity. The diameter of the cylindrical surface 111 is D2, which represents twice the distance from any point on the cylindrical surface to the axis. The cross-sectional circular diameter d of the S-shaped cooling channel, the outer diameter D1 of the bearing outer ring, the diameter D2 of the cylindrical surface, the groove bottom diameter D3 of the bearing outer ring, and the inner diameter D4 of the bearing outer ring satisfy D1>D2+d>D2-d>D3>D4.

[0024] The relationship between the structural parameters of the S-shaped cooling channel 106 is as follows: the adjacent parallel axial and perpendicular axial channels are regarded as a turn, the through cooling channel with independent corresponding cooling channel lubricating oil inlet and cooling channel lubricating oil outlet is regarded as an S-shaped cooling channel, the number of turns of each S-shaped cooling channel is n, the number of S-shaped cooling channels in the bearing outer ring is m, starting from the first S-shaped cooling channel, in clockwise order, they are named as the second S-shaped cooling channel, to the mth S-shaped cooling channel, the size parameters of the S-shaped cooling channel meet , and m≥2; the order of determining the structural parameters is: first determine the bearing sizes W, D1, D2, and D4; according to the relationship D1>D2+d>D2-d>D3>D4, first determine the centerline tangent position D3, and then determine the d range; select a suitable d value according to the d range, and then determine the s2 and r ranges, and give values ​​within the range; after determining m and n, determine the size of s1.

[0025] The width W of the ball bearing outer ring, the outer diameter D1 of the ball bearing outer ring, the groove bottom diameter D3 of the bearing outer ring, and the inner diameter D4 of the bearing outer ring conform to the conventional aircraft engine bearing size parameters. The value range of D1 is [4.5W, 5.3W], the value range of D3 is [4.2W, 4.8W], and the value range of D4 is [4W, 4.8W].

[0026] like Figure 5 and 6 As shown, the cooling channel oil inlet includes a first S-shaped cooling channel oil inlet 107, a second S-shaped cooling channel oil inlet 109, to the m-th S-shaped cooling channel oil inlet; the cooling channel oil outlet includes a first S-shaped cooling channel oil outlet 108, a second S-shaped cooling channel oil outlet 110, to the m-th S-shaped cooling channel oil outlet; the first S-shaped cooling channel oil outlet and the second S-shaped cooling channel oil inlet are adjacent, and the (m-1)th S-shaped cooling channel oil outlet and the m-th S-shaped cooling channel oil inlet are adjacent.

[0027] A method for cooling and lubricating a bearing with an S-shaped cooling structure, characterized in that cooling and lubricating oil is introduced into an outer ring of the bearing with the S-shaped cooling structure to achieve cooling and lubrication, specifically comprising the following steps: Step 1: The cooling lubricating oil enters the S-shaped cooling channel through the cooling channel lubricating oil inlet on the bearing outer ring, and the cooling lubricating oil entering the S-shaped cooling channel flows out from the corresponding cooling channel lubricating oil outlet, thereby completing the cooling and lubrication of the ball bearing outer ring; Step 2: Pass the cooling lubricating oil into the ball bearing with an S-shaped cooling structure through the inner ring oil supply hole. The cooling lubricating oil flows through the bearing inner ring, retaining frame and balls to complete the cooling and lubrication of the bearing inner ring, retaining frame and balls.

[0028] The initial temperature of the cooling lubricating oil is 300K-350K, and the heat flux density is 100000W / m 2 ~200000W / m 2 , the oil supply flow rate is 1L / min~5L / min.

[0029] Furthermore, the initial temperature of the cooling lubricating oil is 323.15K, and the heat flux density is 150000W / m 2 , the oil supply flow rate is 1.5L / min.

[0030] In the specific implementation, the width W of the ball bearing outer ring 103 is 40mm, the outer diameter D1 of the ball bearing outer ring 103 is 205mm, the groove bottom diameter D3 of the ball bearing outer ring 103 is 189mm, and the inner diameter D4 of the ball bearing outer ring 103 is 178mm. Two sections of S-shaped cooling channels 106 are symmetrically arranged at the center of the bearing outer ring 103, wherein the cross section of each section of the channel is circular, and the diameter d is 4mm; the center line spacing s1 of the two adjacent straight sections of the channel parallel to the axis is 18.2mm, and the center line spacing s2 of the two straight sections of the channel perpendicular to the axis is 30mm; the center line of the channel at the turning point is an arc transition, and the arc radius r is 6mm; the number m of S-shaped cooling channels included in the bearing outer ring 103 is 2, and the number n of turns of each S-shaped cooling channel is 32. By setting the cross-sectional diameter d of the S-shaped cooling channel 106 , the number m of the S-shaped cooling channels, and the number n of turns of each S-shaped cooling channel according to actual needs, efficient cooling of the bearing outer ring 103 can be achieved.

[0031] In this embodiment, the center line of the S-shaped cooling channel 106 is tangent to a cylindrical surface 111 of equal diameter coaxial with the outer ring of the bearing, and the diameter D2 of the cylindrical surface is 197 mm.

[0032] As a specific solution of this embodiment, the first S-shaped cooling channel lubricating oil outlet 108 and the second S-shaped cooling channel lubricating oil inlet 109 are arranged adjacent to each other.

[0033] In this embodiment, the inner diameter d of the cooling lubricating oil inlet and the inner diameter d of the cooling lubricating oil outlet are both 4 mm. The cooling lubricating oil inlet and the cooling lubricating oil outlet are both cylindrical flow channels, which are parallel to the axial direction and can prevent the cooling lubricating oil at the outlet from flowing into the bearing cavity, thereby preventing additional lubricating oil friction and viscous resistance from being generated due to excessive cooling lubricating oil in the bearing cavity.

[0034] In this embodiment, the ball bearing outer ring 103 with an S-shaped cooling structure is processed by metal 3D printing technology, with a printing accuracy of ≯0.05mm and an internal roughness of the hollow flow channel ≯Ra1.

[0035] In this embodiment, in order to verify the effect of the present invention on reducing flow resistance, ANSYS software was used to perform simulation calculations. During the calculation, for the multi-channel annular cooling structure in the prior art and the S-shaped cooling structure proposed in the present invention, the fluid pressure loss of the two structures under different lubricating oil inlet flow conditions is as follows: Figure 7 shown.

[0036] Figure 7 This is a graph showing the relationship between the fluid pressure loss of the S-shaped cooling structure and the multi-channel annular cooling structure and the oil supply flow rate. The horizontal axis in the figure is the total oil supply of the cooling channel inside the bearing outer ring, and the vertical axis is the fluid pressure loss inside the cooling channel.

[0037] Depend on Figure 7 It can be seen that as the lubricating oil inlet flow rate increases, the fluid pressure loss of the multi-channel annular cooling structure and the S-shaped cooling structure increases; under the same lubricating oil flow conditions, the S-shaped cooling structure can significantly reduce the fluid pressure loss compared to the multi-channel annular cooling structure. When the lubricating oil flow rate is 2.5L / min, the fluid pressure loss of the S-shaped cooling structure is only 21.0% of the pressure loss of the multi-channel annular cooling structure; as the lubricating oil flow rate increases, the S-shaped cooling structure has a better effect in reducing the fluid pressure loss; when the lubricating oil flow rate is 5L / min, the fluid pressure loss of the S-shaped cooling structure is only 17.2% of the pressure loss of the multi-channel annular cooling structure. From the above analysis, it can be seen that compared with the multi-channel annular cooling structure, the S-shaped cooling structure proposed in the present invention has multiple S-shaped cooling channels that are not connected to each other, including corresponding cooling lubricating oil inlets and cooling lubricating oil outlets, which can reduce fluid pressure losses.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ball bearing with an S-shaped cooling structure, characterized in that: It includes a bearing inner ring, a bearing outer ring, a cage, and a plurality of balls circumferentially arranged on the cage, which are coaxially arranged inside the bearing. A plurality of non - communicating S - shaped cooling channels are provided inside the bearing outer ring, and each S - shaped cooling channel is provided with a corresponding cooling channel lubricating oil inlet and a cooling channel lubricating oil outlet; a lubricating oil supply hole for the balls is penetratingly provided on the bearing inner ring.

2. A ball bearing with an S-shaped cooling structure as claimed in claim 1, characterized in that: The radial cross - section of the S - shaped cooling channel is circular. The plurality of non - communicating S - shaped cooling channels are centrosymmetrically distributed relative to the bearing outer ring. The center - line distance between two adjacent channels parallel to the axial direction in the S - shaped cooling channel is s1, and the center - line distance between the inlets and outlets of adjacent S - shaped cooling channels is 2h, and 2h = s1.

3. A ball bearing with an S-shaped cooling structure as claimed in claim 1 or 2, characterized in that: In the S - shaped cooling channel, the diameter of the cross - section circle is d, the center - line distance between two adjacent straight sections parallel to the axial direction is s1, the center - line distance between two straight sections perpendicular to the axial direction is s2, and the center - line arc radius at the turning of adjacent parallel - axial and perpendicular - axial channels is r. The width of the bearing outer ring is W. The following relationships are satisfied among the various dimensional parameters: d + s2 < W, and the value range of s2 is [2d, 8d], and the value range of r is [d, 2d].

4. A ball bearing with an S-shaped cooling structure as claimed in claim 3, characterized in that: The center - line of the S - shaped cooling channel is tangent to a cylindrical surface coaxial with the bearing outer ring. The diameter of the cylindrical surface is D2. The following relationships are satisfied among the diameter d of the cross - section circle of the S - shaped cooling channel, the outer diameter D1 of the bearing outer ring, the diameter D2 of the cylindrical surface, the bottom diameter D3 of the bearing outer ring groove, and the inner diameter D4 of the bearing outer ring: D1 > D2 + d > D2 - d > D3 > D4.

5. A ball bearing with an S-shaped cooling structure as claimed in claim 4, characterized in that: The relationship between the structural parameters of the S-shaped cooling channel is as follows: the adjacent parallel axial and vertical axial channels are regarded as a turn, the through cooling channel with independent corresponding cooling channel lubricating oil inlet and cooling channel lubricating oil outlet is regarded as an S-shaped cooling channel, the number of turns of each S-shaped cooling channel is n, the number of S-shaped cooling channels in the bearing outer ring is m, starting from the first S-shaped cooling channel, in clockwise order, they are named as the second S-shaped cooling channel, to the mth S-shaped cooling channel, the size parameters of the S-shaped cooling channel meet , and m≥2.

6. A ball bearing with an S-shaped cooling structure as claimed in claim 4, characterized in that: The width W of the ball bearing outer ring, the outer diameter D1 of the ball bearing outer ring, the bottom diameter D3 of the bearing outer ring groove, and the inner diameter D4 of the bearing outer ring conform to the conventional aero - engine bearing dimensional parameters. The value range of D1 is [4.5W, 5.3W], the value range of D3 is [4.2W, 4.8W], and the value range of D4 is [4W, 4.8W].

7. A ball bearing with an S-shaped cooling structure according to any one of claims 1 to 6, characterized in that: The cooling channel lubricating oil inlets include the first S - shaped cooling channel lubricating oil inlet, the second S - shaped cooling channel lubricating oil inlet, up to the m - th S - shaped cooling channel lubricating oil inlet; the cooling channel lubricating oil outlets include the first S - shaped cooling channel lubricating oil outlet, the second S - shaped cooling channel lubricating oil outlet, up to the m - th S - shaped cooling channel lubricating oil outlet; the first S - shaped cooling channel lubricating oil outlet and the second S - shaped cooling channel lubricating oil inlet are adjacent; the (m - 1) - th S - shaped cooling channel lubricating oil outlet and the m - th S - shaped cooling channel lubricating oil inlet are adjacent.

8. A method for cooling and lubricating a bearing having an S-shaped cooling structure as claimed in claims 1 to 7, characterized in that Cooling and lubricating are achieved by introducing cooling lubricating oil into the bearing outer ring with an S - shaped cooling structure, including the following steps: Step 1: Pass the cooling lubricating oil through the cooling channel lubricating oil inlet on the bearing outer ring and into the S - shaped cooling channel. The cooling lubricating oil entering the S - shaped cooling channel flows out from the corresponding cooling channel lubricating oil outlet, completing the cooling and lubrication of the ball bearing outer ring. Step 2: Pass the cooling lubricating oil through the inner - ring lubricating oil supply hole into the ball bearing with an S - shaped cooling structure. The cooling lubricating oil flows through the bearing inner ring, the cage, and the balls, completing the cooling and lubrication of the bearing inner ring, the cage, and the balls.

9. A method for cooling and lubricating a bearing with an S-shaped cooling structure as claimed in claim 8, characterized in that: The initial temperature of the cooling lubricating oil is 300K-350K, and the heat flux density is 100000W / m 2 ~200000W / m 2 , the oil supply flow rate is 1L / min~5L / min.

10. A method for cooling and lubricating a bearing with an S-shaped cooling structure according to claim 8, characterized in that: The initial temperature of the cooling lubricating oil is 323.15K, and the heat flux density is 150000W / m 2 , the oil supply flow rate is 1.5L / min.

Images