JP4089363B2

JP4089363B2 - Rolling bearing device

Info

Publication number: JP4089363B2
Application number: JP2002267838A
Authority: JP
Inventors: 弘上野; 正章大槻; 正二江口
Original assignee: 株式会社ジェイテクト
Priority date: 2002-09-13
Filing date: 2002-09-13
Publication date: 2008-05-28
Anticipated expiration: 2022-09-13
Also published as: JP2004108388A; CN101240815B; CN1688827A; CN100420868C; CN101240815A

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
Conventionally, there is an oil supply unit that supplies a small amount of lubricating oil to a rolling bearing (see Patent Document 1).
[0003]
In this lubrication unit, a tank is installed at a location distant from the installation position of the rolling bearing, a nozzle is installed so as to face the inner and outer rings of the rolling bearing, and the tank and the nozzle are connected by an oil supply path. ing.
[0004]
The conventional oil supply unit needs to be installed separately from the rolling bearing, and installation is troublesome. On the other hand, there exists what installed the lubrication pump which discharges lubricating oil inside a rolling bearing (refer patent document 2).
[0005]
[Patent Document 1]
JP 2002-130593 A [Patent Document 2]
Japanese Unexamined Patent Publication No. 3-113119
[Problems to be solved by the invention]
In the conventional example shown in Patent Document 2, since the lubrication pump is a vane pump and the outer size is large, it is necessary to increase the size of the rolling bearing and to secure a pump installation area for the outer ring of the rolling bearing. There is a concern that the cost will be high. In addition, the tank for storing the lubricating oil needs to be installed outside the rolling bearing.
[0007]
[Means for Solving the Problems]
In the rolling bearing device according to the present invention, an oil supply unit for supplying lubricating oil to a rolling element or a raceway surface of a fixed ring or a rotating ring as needed is attached to the fixed ring side of the rolling bearing. The unit includes a tank that stores lubricating oil, a micropump that sucks and discharges the lubricating oil in the tank, and a drive unit that drives the micropump.
[0008]
Thus, since the oil supply unit is attached to the rolling bearing, the oil supply unit can be easily installed and the rolling bearing device can be made compact. Further, since the oil supply unit supplies lubricating oil to the rolling bearings as necessary, there is no waste of supplying the lubricating oil when unnecessary, and it can contribute to long-term stabilization of the rolling characteristics.
[0009]
By the way, the drive unit can be a generator having a power generation capacity corresponding to the rotational speed of the rolling bearing, and the amount of lubricating oil discharged by the micropump can be controlled according to the power generation capacity of the power generator. . In this way, by controlling the amount of lubricating oil discharged by the micropump according to the number of rotations of the rolling bearing, an appropriate amount of lubricating oil can be supplied, and excess and deficiency can be eliminated.
[0010]
The oil supply unit includes a sensor that detects a lubrication state of the raceway surface of the fixed wheel or the rotating wheel, and can control a lubricant discharge amount by the micropump based on a detection output from the sensor. In this case, an appropriate amount of lubricating oil can be supplied according to the lubrication state.
[0011]
Further, the oil supply unit may be detachably attached in the vicinity of a shoulder portion of a peripheral surface facing the rotating wheel in the fixed wheel. In this case, when the lubricating oil in the tank is insufficient, it can be removed and replenished or replaced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the present invention. In the figure, 1 is an inner ring, 2 is an outer ring, 3 is a ball as a plurality of rolling elements, 4 is a cage ring, and 5 and 6 are seal rings.
[0013]
The rolling bearing device of the illustrated example is called a deep groove type ball bearing, and a plurality of balls 3 are interposed between raceway grooves 1a and 2a provided in the inner and outer rings 1 and 2 to hold the plurality of balls 3 in a waveform. It is held by a cage ring 4 called a vessel. Here, the outer ring 2 is a fixed ring and the inner ring 1 is a rotating wheel. The seal rings 5 and 6 are attached to both shoulders of the inner peripheral surface of the outer ring 2 as a fixed ring and are in contact with both shoulders of the outer peripheral surface of the inner ring 1 as a rotating ring. The openings at both ends in the axial direction in the first and second opposed annular spaces are closed.
[0014]
This embodiment is characterized in that an oil supply unit 7 is attached inside one seal ring 5 in the opposed annular space.
[0015]
The oil supply unit 7 includes a tank 8, a generator 9, and a micropump 10 having a driven part, and generates power with the generator 9 as the inner ring 1 rotates to drive the micropump 10. Thus, the lubricating oil in the tank 8 is supplied to the vicinity of the raceway groove 2a of the outer ring 2 and the balls 3 little by little.
[0016]
The tank 8 is made of a hollow annular member that stores lubricating oil, and is attached to the inner surface of the seal ring 5. The tank 8 can be a partial annular member that is installed in a predetermined angular region on the circumference, instead of being annular.
[0017]
The generator 9 includes a stator 9 a that is attached to the inner side surface of the tank 8 and a rotor 9 b that is integrally formed on one shoulder of the outer peripheral surface of the inner ring 1. The rotor 9b is formed by alternately magnetizing N poles and S poles at equal intervals around the inner ring 1 as a body. In addition, a magnetizing ring or the like formed by alternately magnetizing N poles and S poles at equal circumferential intervals may be attached to a predetermined position on the outer peripheral surface of the inner ring 1.
[0018]
As the micropump 10, for example, the diaphragm 12 as a driven part is reciprocally displaced by the piezoelectric element 11, thereby sucking the lubricating oil in the tank 8 into the pump chamber 13 and discharging it from the nozzle 10 a for discharging oil. A diaphragm pump or the like that generates a pumping action is applied. The piezoelectric element 11 is energized by the generator 9. A miniature motor or the like can be used instead of the piezoelectric element 11. The nozzle 10 a of the micropump 10 is directed near one end of the raceway groove 2 a of the outer ring 2 and the ball 3.
[0019]
As shown in FIG. 3, the tank 8 and the micropump 10 have an oil suction nozzle 10 b provided on the side surface of the micropump 10 and an oil supply nozzle provided on the side surface of the tank 8. The holes 8a are connected to each other by being fitted through the rubber tube 14.
[0020]
Thus, the tank 8 of the fuel supply unit 7 is attached to the seal ring 5 so that the tank 8 can be easily attached and detached after the seal ring 5 is removed. Therefore, the tank 8 can be easily installed and removed, and the entire rolling bearing device can be made compact. Further, when the lubricating oil in the tank 8 is insufficient, the tank 8 can be removed together with the seal ring 5 to supply the lubricating oil to the tank 8, or the tank 8 itself can be replaced with a new one. .
[0021]
The generator 9 has a power generation capacity corresponding to the number of rotations of the rolling bearing, and the amount of lubricating oil discharged by the micropump 10 is controlled according to the power generation capacity of the power generator 9. For example, a very small amount of lubricating oil is directly applied to the ball 3 and the vicinity of the raceway groove 2a of the outer ring 2 in a region where the rotational speed of the inner ring 1 is low, and in a region where the rotational speed is high. Is sprayed on.
[0022]
Thus, in the rolling bearing device described above, the lubricating oil can be continuously supplied to the rolling region of the ball 3 of the rolling bearing without excess or deficiency over a long period of time. Can contribute to improvement.
[0023]
In addition, this invention is not limited only to embodiment mentioned above, Various application and deformation | transformation can be considered.
[0024]
(1) In the above embodiment, although not shown, the tank 8 is detachably attached to the outer surface of the seal ring 5, and the generator 9 and the micropump 10 are attached to the inner surface of the seal ring 5. Can do. In this case, when the lubricating oil in the tank 8 is insufficient, the lubricating oil can be replenished to the tank 8 or the tank 8 itself can be replaced with a new one without removing the seal ring 5.
[0025]
(2) In the above embodiment, for example, the amount of lubricating oil discharged by the micropump 10 can be controlled in accordance with the lubrication state of the rolling bearing. The lubrication state can be recognized based on the temperature of the rolling bearing, for example. Therefore, for example, a temperature sensor such as a thermocouple can be mounted around the raceway portion of the rolling bearing, and the amount of lubricant discharged by the micropump 10 can be controlled by the control circuit based on the detection output of the temperature sensor. The control circuit may be attached to a rolling bearing, or may be installed on a support portion that supports the rolling bearing.
[0026]
(3) Although the bearing type of the rolling bearing device is a deep groove type ball bearing, the present invention can be applied to various other known types. Further, the cage ring 4 may be a corrugated cage, a synthetic resin cage or the like in addition to the corrugated cage.
[0027]
【The invention's effect】
In the present invention, since the oil supply unit is attached to the rolling bearing, the oil supply unit can be easily installed and the rolling bearing device can be made compact. Further, since the oil supply unit supplies lubricating oil to the rolling bearings as necessary, there is no waste of supplying the lubricating oil when unnecessary, and it can contribute to long-term stabilization of the rolling characteristics.
[Brief description of the drawings]
1 is a sectional view showing an upper half of a rolling bearing device according to an embodiment of the present invention. FIG. 2 is a side view of the rolling bearing device of FIG. 1. FIG. 3 is a connection structure of a tank and a micropump in FIG. Sectional view showing [signs]
DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cage ring 5, 6 Seal ring 7 Refueling unit 8 Refueling unit tank 9 Refueling unit generator 10 Refueling unit micropump 10a Micropump nozzle

Claims

On the fixed ring side of the rolling bearing, an oil supply unit that supplies lubricating oil to the rolling elements or raceway surfaces of the fixed ring and the rotating ring as needed is attached.
A rolling bearing device in which the oil supply unit includes a tank that stores lubricating oil, a micropump that sucks and discharges the lubricating oil in the tank, and a drive unit that drives the micropump.
The rolling bearing according to claim 1, wherein the driving unit is a generator having a power generation capability corresponding to the number of rotations of the rolling bearing, and a lubricant discharge amount by the micropump is controlled according to the power generation capability of the generator. apparatus.
The lubrication unit includes a sensor that detects a lubrication state of a raceway surface of the fixed wheel or the rotating wheel, and a lubricant discharge amount by the micropump is controlled based on a detection output from the sensor. Rolling bearing device.
The rolling bearing device according to any one of claims 1 to 3, wherein the oil supply unit is detachably attached in the vicinity of a shoulder portion of a peripheral surface facing the rotating wheel in the fixed wheel.