Machine device for roller bearing
The mechanical device for rolling bearings addresses the challenge of high-speed lubrication by mixing lubricating oil with air and maintaining a pressure gradient to ensure smooth flow through the bearing space, achieving stable lubrication and preventing heat-related malfunctions.
Patent Information
- Application Number
- JP2023194157
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-15
- Publication Date
- 2025-05-27
AI Technical Summary
High-speed rotating rolling bearings experience increased energy conversion to heat due to rotational resistance, leading to insufficient lubrication and potential malfunction from seizure, especially when the dmn value exceeds 1,000,000.
A mechanical device for rolling bearings that includes an oil supply passage for lubricating oil and a ventilation passage for drawing air into the oil supply side space, creating a mixture with reduced penetration resistance. The static pressure in the oil drain side space is maintained lower than in the oil supply side space, allowing the mixture to smoothly flow through the bearing space for stable lubrication.
This configuration ensures stable and effective lubrication of high-speed rotating rolling bearings without the need for special machining, preventing abnormal heat generation and seizure, and allowing for long-term stable operation.
Smart Images
Figure 2025080833000001_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a mechanical device for a rolling bearing that holds and lubricates a rolling bearing that is assembled to a rotating shaft while rotating at high speed.
Background Art
[0002] In the technical field of electric vehicles, as a means to reduce electricity costs and improve driving performance, there is a movement to increase the rotational speed of the motor, reduce the size and weight of the motor, and increase the output density of the motor. However, when trying to increase the speed of the motor, the rolling bearing that supports the rotating shaft to which the rotation of the motor is input will convert more energy into heat due to the increase in rotational resistance accompanying the increase in rotational speed, and it will easily generate heat. In addition, when the rotational speed of the rolling bearing increases, the lubricating oil becomes difficult to enter the rolling contact portion between the rolling elements and the inner and outer rings due to the air flow in the rotational direction generated inside the bearing (curtain effect), and the heat exchange from the rolling contact portion to the lubricating oil also becomes insufficient, so there is a risk of malfunction of the bearing function due to seizure or the like.
[0003] To solve the above problems, for example, a method as disclosed in Patent Document 1 has been proposed. The mechanical device for a rolling bearing (hereinafter, also simply referred to as "mechanical device") used in Patent Document 1, as shown in FIG. 7, has a plurality of rolling elements (balls) 53 arranged in an annular bearing space between an outer ring 51 and an inner ring 52. The rolling bearing (angular ball bearing) 54 is held in a state of being assembled to the rotating shaft 60 by an outer cylinder 55 into which the outer ring 51 is fitted, inner ring spacers 56 and 57 that abut against both end faces of the inner ring 52, and outer ring spacers 58 and 59 that abut against both end faces of the outer ring 51. An oil supply nozzle (not shown) is provided on the outer ring spacer 58 on one side (the left side in FIG. 7), and the lubricating oil sent from an external lubricating oil supply device is supplied to one side of the bearing space of the rolling bearing 54 by the oil supply nozzle.
[0004] Hereinafter, the side where lubricating oil is supplied to the rolling bearing is referred to as the "oil supply side", and the side where the lubricating oil is discharged is referred to as the "oil discharge side". Accordingly, the space on one side of the rolling bearing where the lubricating oil is supplied is referred to as the "oil supply side space", and the space on the other side of the rolling bearing where the lubricating oil is discharged is referred to as the "oil discharge side space".
[0005] Further, the oil discharge hole 51a and the oil discharge groove 51b provided in the outer ring 51 communicate the bearing space on the oil discharge side of the rolling bearing 54 with the oil discharge passage 55a provided in the outer cylinder 55, and the oil discharge passage 55a is connected to a negative pressure generating device. When the negative pressure generating device is operated, a negative pressure acts on the oil discharge hole 51a and the oil discharge groove 51b of the outer ring 51 of the rolling bearing 54 due to the suction force, and excess lubricating oil in the bearing space on the oil discharge side of the rolling bearing 54 is discharged through the oil discharge hole 51a and the oil discharge groove 51b, and it is said that abnormal heat generation due to excessive lubricating oil and stirring resistance can be suppressed.
Prior Art Documents
Patent Documents
[0006]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0007] However, even when using a mechanical device as proposed in Patent Document 1, when the dmn value (pitch circle diameter dm (mm) of the rolling element × rotational speed n (min -1 ) is 1,000,000 or more, the resistance to the flow of lubricating oil from the oil supply side space to the oil discharge side space (hereinafter referred to as "penetration resistance") due to the curtain effect increases, so that the lubricating oil does not flow sufficiently from the oil supply side space to the oil discharge side space, and the inflow and discharge of the lubricating oil into and from the bearing space are hindered, and there is a possibility that insufficient lubrication cannot be eliminated.
[0008] In Patent Document 1, an oil drain hole and an oil drain groove are provided in the outer ring of the rolling bearing in accordance with the position of the oil drain passage of the mechanical device. However, this increases the cost of the rolling bearing and lengthens the manufacturing period due to the need for machining of the outer ring, and there is also concern about a decrease in the strength of the rolling bearing.
[0009] Therefore, an object of the present invention is to provide a mechanical device for a rolling bearing that can stably maintain good lubrication without requiring special machining for a rolling bearing that rotates at high speed.
Means for Solving the Problems
[0010] In order to solve the above problems, the present invention holds a rolling bearing in which a plurality of rolling elements are arranged in an annular bearing space between an outer ring and an inner ring in a state of being assembled to a rotating shaft, and has an oil supply passage for supplying lubricating oil sent from an external lubricating oil supply device to an oil supply side space on one side of the bearing space. In a mechanical device for a rolling bearing including an axle box and an oil drain means for making the static pressure in an oil drain side space on the other side of the bearing space smaller than the static pressure in the oil supply side space and drawing out lubricating oil from the oil drain side space, a ventilation passage for drawing air from the outside into the oil supply side space is provided in the axle box (Configuration 1).
[0011] When the mechanical device for a rolling bearing of this Configuration 1 is used, the lubricating oil flowing in from the oil supply passage of the axle box and the air flowing in from the ventilation passage of the axle box are mixed in the oil supply side space on one side of the rolling bearing. Since the penetration resistance of the rolling bearing of the mixture is smaller than that of the lubricating oil alone, when the static pressure in the oil drain side space on the other side of the rolling bearing is made smaller than the static pressure in the oil supply side space, the mixture smoothly flows from the oil supply side space to the oil drain side space (penetrating the bearing space), promoting the inflow and discharge of lubricating oil to and from the bearing space, and a stable and good lubrication state can be obtained.
[0012] In the above Configuration 1, it is desirable to provide a check valve for preventing the outflow of the lubricating oil supplied to the oil supply side space from the ventilation passage (Configuration 2). By doing so, when starting the supply of lubricating oil to the oil supply side space, it is possible to prevent the lubricating oil from being blown out from the ventilation passage in the transient state and effectively supply the lubricating oil.
[0013] In the above Configuration 1 or 2, as the oil drain means, a labyrinth communicating with the oil drain side space is provided between the fixed side member including the axle box and the rotating side member including the rotating shaft, and on either the inner peripheral surface of the fixed side member forming the labyrinth or the outer peripheral surface of the rotating side member, a screw pump mechanism provided with a screw shape in the winding direction that generates an action of drawing out the lubricating oil in the oil drain side space to the outside as the rotating shaft rotates in one direction can be adopted (Configuration 3).
[0014] In the above Configuration 3, it is desirable that the axial length of the screw shape of the screw pump mechanism is equal to or greater than the axial length of the labyrinth (Configuration 4). Furthermore, in any of the above Configurations 3 and 4, it is desirable to provide a plurality of circumferential grooves on the side where the screw shape is not provided among the inner peripheral surface of the fixed side member forming the labyrinth of the screw pump mechanism and the outer peripheral surface of the rotating side member (Configuration 5). By adopting this Configuration 4 or Configuration 5, an action (pumping action) of more effectively drawing out the lubricating oil in the oil drain side space to the outside can be obtained.
[0015] And in any of the above Configurations 3 to 5, it is desirable that the screw shape of the screw pump mechanism is provided on the inner peripheral surface of the fixed side member (Configuration 6). By doing so, when changing the screw shape in response to changes in the rotation speed of the rotating shaft, etc., it becomes easier to change the design and manufacture of the parts compared to the case where a male screw is provided on the outer peripheral surface of the rotating side member.
[0016] Further, in the above-described Configuration 1 or 2, on the side where lubricating oil is discharged from the rolling bearing, oil seal means for preventing leakage of the lubricating oil from the oil discharge side space to the outside is provided. The oil seal means is provided with a labyrinth communicating with the oil discharge side space between a fixed side member including the axle box and a rotating side member including the rotating shaft. On either the inner peripheral surface of the fixed side member forming the labyrinth or the outer peripheral surface of the rotating side member, a screw seal mechanism is provided with a screw shape in the winding direction in which a flow (force) in the direction toward the oil discharge side space is generated in the lubricating oil in the labyrinth as the rotating shaft rotates in one direction (Configuration 7).
[0017] The above-described Configuration 7 is preferably implemented when the static pressure in the oil discharge side space can be made sufficiently lower than the static pressure in the oil supply side space by the oil discharge means. In that case, oil sealing for the oil discharge side space can be performed while ensuring smooth inflow and discharge of the lubricating oil into and from the bearing space and ensuring good lubrication.
[0018] Further, in any of the above-described Configurations 1 to 7, on the side where lubricating oil is supplied to the rolling bearing, oil seal means for preventing leakage of the lubricating oil from the oil supply side space to the outside is provided. The oil seal means is provided with a labyrinth communicating with the oil supply side space between a fixed side member including the axle box and a rotating side member including the rotating shaft. On either the inner peripheral surface of the fixed side member forming the labyrinth or the outer peripheral surface of the rotating side member, a screw seal mechanism is provided with a screw shape in the winding direction in which a flow (force) in the direction toward the oil supply side space is generated in the lubricating oil in the labyrinth as the rotating shaft rotates in one direction (Configuration 8). In this way, oil sealing for the oil supply side space can be performed while maintaining a state where the static pressure in the oil supply side space is greater than the static pressure in the oil discharge side space and ensuring good lubrication.
[0019] Furthermore, in any of the above Configurations 1 to 8, if a configuration is adopted in which a pressure converter that numerically displays the static pressures of the oil supply side space and the oil drain side space respectively, or a pressure switch or differential pressure switch that indicates the magnitude relationship between the static pressure of the oil supply side space and the static pressure of the oil drain side space is provided (Configuration 9), it is possible to monitor the magnitude relationship between the static pressure of the oil supply side space and the static pressure of the oil drain side space, and to control so that the static pressure of the oil drain side space is kept smaller than the static pressure of the oil supply side space, thereby maintaining good lubrication.
Advantages of the Invention
[0020] As described above, the rolling bearing mechanical device of the present invention has an axle box having an oil supply passage for supplying lubricating oil to the oil supply side space on one side of the rolling bearing, and is provided with a ventilation passage for drawing air into the oil supply side space, and by making the static pressure of the oil drain side space on the other side of the rolling bearing smaller than the static pressure of the oil supply side space, the mixture of lubricating oil and air smoothly penetrates the bearing space. Therefore, without requiring special processing for the target rolling bearing, the lubrication state of the rolling bearing can be stably and favorably maintained. Accordingly, the rolling bearing held by this mechanical device can sufficiently perform heat exchange from the rolling contact portion between the rolling elements and the inner and outer rings to the lubricating oil even in applications with high-speed rotation, and there is no risk of abnormal heat generation or seizure, and it can be used stably for a long period of time.
Brief Description of the Drawings
[0021]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Mode for Carrying Out the Invention
[0022] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. FIGS. 1 to 3 show the general usage state of the rolling bearing machine device 10 of the first embodiment. As shown in FIG. 1, this machine device 10 has a ball bearing 4 as a rolling bearing in which a plurality of balls 3 as rolling elements are arranged in an annular bearing space between an outer ring 1 and an inner ring 2 (hereinafter also simply referred to as a "bearing"). The outer ring 1 of the bearing 4 is fitted into a bearing housing 11, inner ring spacers 12 and 13 that respectively abut against one end face and the other end face of the inner ring 2, an outer ring spacer 14 that abuts against the other end face of the outer ring 1, and an annular fixed cover 15 fixed to the other end face of the bearing housing 11 are held in a state of being assembled to the rotating shaft 5.
[0023] The bearing housing 11 has an oil supply passage 11a that opens on the outer peripheral surface of one end side and extends in the radial direction at a predetermined position in the circumferential direction. As shown in FIG. 2, an oil supply nozzle 11b that opens into the oil supply side space 6 on one side of the bearing 4 is provided near the inner peripheral side end of the oil supply passage 11a, and lubricating oil sent from an external lubricating oil supply device (not shown) through a lubricating oil path (solid line arrow in FIG. 1) is supplied to the oil supply side space 6 by the oil supply nozzle 11b. Note that the lubricating oil supply method can be circulating oil supply, splash oil supply, jet oil supply, etc.
[0024] Also, in the axle box 11, an air vent passage 11c that opens on the outer peripheral surface of one end side and extends radially is provided at a position where it does not interfere with the above-described oil supply passage 11a. The air vent passage 11c opens into the oil supply side space 6 at the inner peripheral side end, and as will be described later, external air is drawn into the oil supply side space 6 through the air vent passage 11c. And, in the middle of the air path (dotted arrow in FIG. 1) including the air vent passage 11c, a check valve 16 for preventing the outflow of the lubricating oil supplied to the oil supply side space 6 from the air vent passage 11c is provided. By providing this check valve 16, it is possible to prevent the blowing out of the lubricating oil from the air vent passage 11c that occurs in the transient state at the start of lubricating oil supply, and effectively supply the lubricating oil.
[0025] The fixed cover 15 has a boss portion 15a that protrudes axially inward from the inner peripheral portion of its inner surface and is fitted into the counterbore portion at the other end of the axle box 11, and a cylindrical portion 15b that extends axially outward from the inner peripheral portion of its outer surface. Also, a plurality of passages 15c that penetrate the inner peripheral portion including the boss portion 15a and the cylindrical portion 15b in the axial direction are provided at predetermined positions in the circumferential direction, and these passages 15c communicate with the oil discharge side space 7 on the other side of the bearing 4. And, an adjustment valve 17 for adjusting the pressure of the oil discharge side space 7 is provided in at least one of the discharge paths (one-dot chain line arrow in FIG. 1) including each passage 15c. In this embodiment, a plurality of passages 15c are provided, but only one passage may be provided.
[0026] Also, on the oil discharge side of this mechanical device 10, a screw pump mechanism 18 is provided as an oil discharge means. As shown in FIG. 3, this screw pump mechanism 18 forms a labyrinth 18a that communicates with the oil discharge side space 7 through the passage 15c between the inner peripheral surface of the cylindrical portion 15b of the fixed cover 15 and the outer peripheral surface of the rotating shaft 5, and a screw thread (screw shape) 15d in a predetermined winding direction is provided on the inner peripheral surface of the cylindrical portion 15b of the fixed cover 15, and the lubricating oil in the oil discharge side space 7 is drawn out to the outside by the pumping action generated by the rotation of the rotating shaft 5 in one direction.
[0027] Here, in this screw pump mechanism 18, the axial length of the female thread 15d of the fixed cover 15 is set to be equal to or greater than the axial length L of the labyrinth 18a, and a plurality of circumferential grooves 5a are provided on the outer peripheral surface of the rotating shaft 5 so as to more effectively draw out the lubricating oil in the oil drainage side space 7 to the outside.
[0028] On the other hand, as shown in FIG. 1, a screw seal mechanism 19 is provided on the oil supply side of this mechanical device 10 as oil seal means for preventing the leakage of lubricating oil from the oil supply side space 6 to the outside. This screw seal mechanism 19 has the same configuration as that in FIG. 3 between the axle box 11 and the inner raceway seat 12 on the oil supply side. That is, although not shown, a labyrinth communicating with the oil supply side space 6 is formed by the inner peripheral surface of the axle box 11 and the outer peripheral surface of the inner raceway seat 12, and a female thread (screw shape) in a predetermined winding direction is provided on the inner peripheral surface of the axle box 11 so that a flow (force) in the direction toward the oil supply side space 6 is generated in the lubricating oil in the labyrinth as the rotating shaft 5 rotates in one direction.
[0029] Also in this screw seal mechanism 19, similar to the above-described screw pump mechanism 18, the axial length of the female thread of the axle box 11 is set to be equal to or greater than the axial length of the labyrinth, and a plurality of circumferential grooves are provided on the outer peripheral surface of the rotating shaft 5 so as to more effectively prevent the leakage of the lubricating oil from the oil supply side space 6.
[0030] Also, although not shown, this mechanical device 10 is provided with a pressure transducer that numerically displays the static pressures of the oil supply side space 6 and the oil drainage side space 7 respectively, or a pressure switch or a differential pressure switch that indicates the magnitude relationship between the static pressure of the oil supply side space 6 and the static pressure of the oil drainage side space 7.
[0031] This mechanical device 10 has the above-described configuration and supplies the lubricating oil sent from an external lubricating oil supply device to the oil supply passage 11a of the axle box 11 to the oil supply side space 6. When the rotating shaft 5 is rotated in one direction, due to the pumping action of the screw pump mechanism 18 on the discharge side, the static pressure in the oil discharge side space 7 becomes lower than the static pressure in the oil supply side space 6, and the lubricating oil in the oil supply side space 6 is mixed with the air flowing in from the ventilation passage 11c of the axle box 11 and flows into the oil discharge side space 7 (penetrating the bearing space). A part of the mixture is drawn out to the outside by the screw pump mechanism 18, and the other part is discharged to the outside from each passage 15c of the fixed cover 15. Note that the static pressures in the oil supply side space 6 and the oil discharge side space 7 can be measured in the bearing external space continuous with the bearing space. Specifically, by making a hole reaching the bearing external space from the outside and measuring with a pressure gauge, the magnitude relationship between the static pressures in the oil supply side space 6 and the oil discharge side space 7 can be confirmed.
[0032] Here, since the penetration resistance of the bearing 4 of the mixture of lubricating oil and air mixed in the oil supply side space 6 is smaller than that of the lubricating oil alone, when the static pressure in the oil discharge side space 7 is made lower than the static pressure in the oil supply side space 6 by the screw pump mechanism 18, the mixture smoothly flows from the oil supply side space 6 to the oil discharge side space 7, promoting the inflow and discharge of the lubricating oil to and from the bearing space, and a stable and good lubrication state can be obtained.
[0033] The magnitude relationship between the static pressure in the oil supply side space 6 and the static pressure in the oil discharge side space 7 is monitored by the aforementioned pressure transducer, pressure switch, or differential pressure switch, and by controlling so that the static pressure in the oil discharge side space 7 is maintained lower than the static pressure in the oil supply side space 6 by adjusting the opening and closing of the adjustment valve 17 on the discharge side, etc., good lubrication can be maintained.
[0034] Therefore, the bearing 4 held by this mechanical device 10 can sufficiently perform heat exchange from the rolling contact portion of the ball 3, the outer ring 1, and the inner ring 2 to the lubricating oil even in applications with high-speed rotation, without the risk of abnormal heat generation or seizure, and can be stably used for a long period of time.
[0035] FIG. 4 shows a schematic usage state of the mechanical device 10 of the second embodiment. In this second embodiment, the screw pump mechanism 18 on the oil discharge side of the first embodiment is eliminated, and as an alternative oil discharge means, a suction pump 20 is provided in the discharge path that does not have the adjustment valve 17 among the discharge paths including the passage 15c of the fixed cover 15. Further, the fixed cover 15 is provided with a cover portion that covers the end face of the rotating shaft 5 and prevents the leakage of lubricating oil from the oil discharge side space 7 to the outside. Note that if the static pressure of the oil discharge side space 7 can be kept sufficiently lower than the static pressure of the oil supply side space 6 by the suction pump 20, the adjustment valve 17 provided in the other discharge path may be closed. Also, instead of the suction pump 20, another fluid machine that can draw out a mixture of lubricating oil and air may be used.
[0036] FIG. 5 shows a schematic usage state of the mechanical device 10 of the third embodiment. This third embodiment is based on the second embodiment, and at the position of the screw pump mechanism 18 of the first embodiment, a screw seal mechanism 21 is provided as oil seal means for preventing the leakage of lubricating oil from the oil discharge side space 7 to the outside. This screw seal mechanism 21 has the opposite screw direction to that of the screw pump mechanism 18 (see FIG. 3) of the first embodiment. That is, as shown in FIG. 6, a labyrinth 21a that communicates with the oil discharge side space 7 through the passage 15c is formed between the inner peripheral surface of the cylindrical portion 15b of the fixed cover 15 and the outer peripheral surface of the rotating shaft 5, and a female screw (screw shape) 15e with a winding direction opposite to that in FIG. 3 is provided on the inner peripheral surface of the cylindrical portion 15b of the fixed cover 15, so that a flow (force) in the direction toward the oil discharge side space 7 is generated in the lubricating oil in the labyrinth 21a as the rotating shaft 5 rotates in one direction.
[0037] Also in this screw seal mechanism 21, the axial length of the female screw 15e of the fixed cover 15 is set to be equal to or greater than the axial length L' of the labyrinth 21a, and a plurality of circumferential grooves 5a are provided on the outer peripheral surface of the rotating shaft 5, so that the leakage of lubricating oil from the oil discharge side space 7 can be more effectively prevented.
[0038] The embodiments disclosed herein should be considered illustrative in all respects and not restrictive. The scope of this invention is defined not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.
[0039] For example, even if the configuration of the mechanical device is partially different from the embodiment, the screw pump mechanism and the screw seal mechanism may be provided between a fixed-side member including a housing, a fixed cover, an outer raceway ring, etc., and a rotating-side member including a rotating shaft, an inner raceway ring, etc.
[0040] Also, the screw shape of the screw pump mechanism and the screw seal mechanism can be such that a male screw is provided on the outer peripheral surface of the rotating-side member. However, it is preferable to provide a female screw on the inner peripheral surface of the fixed-side member as in the embodiment because it is easier to change the design and manufacture of parts when changing the screw shape in response to changes in the rotation speed of the rotating shaft, etc., compared to the case where a male screw is provided on the outer peripheral surface of the rotating-side member.
[0041] And this invention can be applied not only to the drive unit (eAxle) of an electric vehicle and the rolling bearings incorporated in industrial machinery, but also to any mechanical device that holds a rolling bearing that rotates at high speed.
Explanation of Reference Numerals
[0042] 1 Outer race 2 Inner race 3 Ball (rolling element) 4 Ball bearing (rolling bearing) 5 Rotating shaft 5a Circumferential groove 6 Oil supply side space 7 Oil discharge side space 10 Mechanical device for rolling bearing 11 Housing 11a Oil supply passage 11c Vent passage 15 Fixed cover 15c Passage 15d, 15e Female screw (screw shape) 16 Check valve 17 Adjusting valve 18 Screw pump mechanism (oil drain means) 18a Labyrinth 19 Screw seal mechanism (oil seal means on the oil supply side) 20 Suction pump (oil drain means) 21 Screw seal mechanism (oil seal means on the oil drain side) 21a Labyrinth
Claims
1. A rolling bearing (4) having a plurality of rolling elements (3) arranged in an annular bearing space between an outer ring (1) and an inner ring (2) is held in a state of being assembled to a rotating shaft (5), and an oil supply passage (11a) for supplying lubricating oil sent from an external lubricating oil supply device to an oil supply side space (6) on one side of the bearing space is provided. The shaft box (11) and, In a rolling bearing mechanical device (10) including an oil discharge means (18, 20) for reducing the static pressure of an oil discharge side space (7) on the other side of the bearing space to be lower than the static pressure of the oil supply side space (6) and drawing out lubricating oil from the oil discharge side space (7). The rolling bearing mechanical device (10) is characterized in that the shaft box (11) is provided with a ventilation passage (11c) for drawing air from the outside into the oil supply side space (6).
2. The rolling bearing mechanical device (10) according to claim 1, further comprising a check valve (16) for preventing the lubricating oil supplied to the oil supply side space (6) from flowing out through the ventilation passage (11c).
3. The oil discharge means is provided with a labyrinth (18a) communicating with the oil discharge side space (7) between a fixed side member including the shaft box (11) and a rotating side member including the rotating shaft (5), and either the inner peripheral surface of the fixed side member forming the labyrinth (18a) or the outer peripheral surface of the rotating side member is provided with a screw pump mechanism (18) having a screw shape in the winding direction that generates an action of drawing out the lubricating oil in the oil discharge side space (7) to the outside as the rotating shaft (5) rotates in one direction. The rolling bearing mechanical device (10) according to claim 1 or 2.
4. The rolling bearing mechanical device (10) according to claim 3, wherein the axial length of the screw shape of the screw pump mechanism (18) is equal to or greater than the axial length of the labyrinth (18a).
5. The rolling bearing mechanical device (10) according to claim 3, wherein a plurality of circumferential grooves (5a) are provided on the side where the screw shape is not provided among the inner peripheral surface of the fixed side member forming the labyrinth (18a) of the screw pump mechanism (18) and the outer peripheral surface of the rotating side member.
6. The rolling bearing mechanical device (10) according to claim 3, wherein the screw shape of the screw pump mechanism (18) is provided on the inner peripheral surface of the fixed side member.
7. On the side where lubricating oil is discharged from the rolling bearing (4), oil seal means for preventing leakage of lubricating oil from the oil discharge side space (7) to the outside is provided. The oil seal means is provided with a labyrinth (21a) communicating with the oil drain side space (7) between a fixed side member including the axle box (11) and a rotating side member including the rotating shaft (5), and on either the inner peripheral surface of the fixed side member forming the labyrinth (21a) or the outer peripheral surface of the rotating side member, a screw seal mechanism (21) is provided with a screw shape in the winding direction in which a flow in the direction toward the oil drain side space (7) is generated in the lubricating oil in the labyrinth (21a) as the rotating shaft (5) rotates in one direction. The rolling bearing machine device (10) according to claim 1 or 2.
8. On the side where lubricating oil is supplied to the rolling bearing (4), an oil seal means for preventing leakage of the lubricating oil from the oil supply side space (6) to the outside is provided. The oil seal means is provided with a labyrinth communicating with the oil supply side space (6) between a fixed side member including the axle box (11) and a rotating side member including the rotating shaft (5), and on either the inner peripheral surface of the fixed side member forming the labyrinth or the outer peripheral surface of the rotating side member, a screw seal mechanism (19) is provided with a screw shape in the winding direction in which a flow in the direction toward the oil supply side space (6) is generated in the lubricating oil in the labyrinth as the rotating shaft rotates in one direction. The rolling bearing machine device (10) according to claim 1 or 2.
9. A pressure transducer for numerically displaying the static pressures of the oil supply side space (6) and the oil drain side space (7) respectively, or a pressure switch or differential pressure switch for indicating the magnitude relationship between the static pressure of the oil supply side space (6) and the static pressure of the oil drain side space (7) is provided. The rolling bearing machine device (10) according to claim 1 or 2.
Citation Information
Patent Citations
Spindle device bearing
JP2009216244A