JPH0573314U - Bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bearing device capable of suppressing leakage of lubricating oil from a bearing portion. In a bearing device in which a part of a shaft body 2 is housed in a bearing 1 and a bearing portion 3 where the bearing 1 and the shaft body 2 face each other is lubricated with lubricating oil, the shaft body 2 which faces the bearing 1 faces each other. The annular grooves 5 and 5 that form tapered grooves that become deeper in the axial direction toward the outer side in the axial direction are formed at the axial end portion of the surface, and the oil repellent 6 is applied to the shaft body 2 on the axially outer side of the annular grooves 5 and 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing device that uses low-viscosity grease or oil as lubricating oil.

[0002]

[Prior Art]

 Conventionally, a hydrodynamic bearing device, which is an example of a bearing device that uses low-viscosity grease or oil as a lubricating oil, has the sleeve and the shaft body facing each other when the sleeve of the hydrodynamic bearing device and the shaft body rotate relative to each other. The lubricating oil is retained in the bearing portion by the dynamic pressure generated in the bearing portion (lubricant self-holding action).

However, when the rotation of the dynamic pressure bearing device is stopped, the lubricant self-holding action does not work, and there is a problem that the lubricant may leak from the bearing portion.

[0004]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a bearing device capable of suppressing the leakage of lubricating oil from the bearing portion.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a bearing device in which a part of a shaft is housed in a bearing, and a bearing portion where the bearing and the shaft face each other is lubricated with lubricating oil. An annular groove extending in the circumferential direction is provided at the axial end of the facing surface of the body, and an oil repellent agent is applied to the axial body outside the annular groove in the axial direction.

Further, it is preferable that the annular groove is a tapered groove that becomes deeper toward the outer side in the axial direction.

[0007]

[Action]

 The oil repellent applied to the shaft body repels the lubricating oil that tends to leak out of the bearing portion, so that the lubricating oil is suppressed from leaking out of the bearing portion.

Further, the annular groove provided in the shaft body serves to prevent the above oil repellent agent from being applied inside the annular groove when the oil repellent agent is applied to the shaft body. At the same time, the oil repellent applied to the shaft body is prevented from entering the bearing portion inside the annular groove. In other words, the presence of the annular groove makes it possible to easily apply the oil repellent to a predetermined area axially outside the annular groove and prevent the oil repellent from entering the bearing portion toward the inner side. It is possible to keep the oil repellent in a desired area.

Further, since the annular groove serves as an oil reservoir for the lubricating oil of the bearing portion, it is possible to prevent the lubricating oil from leaking out of the bearing portion.

Further, when the annular groove is formed into a taper groove that becomes deeper toward the outer side in the axial direction, the lubricating oil in the annular groove can be prevented by the centrifugal force applied to the lubricating oil when the shaft body rotates. The taper groove is moved inward in the axial direction along the sloped surface that is inclined inward in the axial direction. Therefore, the lubricating oil sealability of the bearing portion during the above rotation is improved.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows a dynamic pressure bearing device as an embodiment of the present invention. In this dynamic pressure bearing device, a part of a shaft body 2 is housed in a bearing 1 fitted in a housing 10, and a bearing portion 3 in which the bearing 1 and the shaft body 2 face each other is lubricated with a low-viscosity grease, oil or the like. Lubricated (not shown). A dynamic pressure groove 8 is formed in the shaft body 2.

Annular grooves 5 and 5 extending in the circumferential direction are provided at both shaft end portions of the facing surface of the shaft body 2 facing the bearing 1, and the shaft body 2 outside the annular grooves 5 and 5 in the axial direction is provided. An oil repellent 6 that repels oil is applied. The outer ends of the annular grooves 5, 5 in the axial direction are located slightly inward (about 0.5 mm) in the axial direction from both ends of the bearing 1, and the oil repellent 6 applied to the shaft body 2 and the bearing 1 A small area is provided to face the inner peripheral surface of the.

The annular grooves 5, 5 are tapered grooves that become deeper toward the outer side in the axial direction.

According to the dynamic pressure bearing device having the above-described configuration, the oil repellent 6 applied to the shaft body 2 repels the lubricating oil that tends to leak out of the bearing portion 3. Leakage to the outside of the bearing portion 3 can be suppressed.

Further, the annular groove 5 provided in the shaft body 2 should be coated inside the annular groove 5 when the oil repellent agent 6 is applied to the shaft body 2. The oil repellent 6 applied to the shaft body 2 is prevented from entering the bearing portion 3 inside the annular groove 5. That is, due to the existence of the annular groove 5, the oil repellent agent 6 can be easily applied to a predetermined area axially outside the annular groove 5, and the oil repellent agent 6 is directed toward the inside of the bearing portion 3. Invasion can be prevented, and the oil repellent agent 6 can be kept in a desired area.

Furthermore, since the annular groove 5 serves as an oil reservoir for the lubricating oil of the bearing portion 3, it is possible to prevent the lubricating oil from leaking out of the bearing portion 3.

Further, since the annular groove 5 is formed as a taper groove that becomes deeper toward the outer side in the axial direction, the lubricating oil in the annular groove 5 is removed by the centrifugal force applied to the lubricating oil when the shaft 2 is rotated. , And is moved inward in the axial direction along the inclined surface of the ascending slope that is directed inward in the axial direction of the annular groove 5 that is a tapered groove. Therefore, the lubricating oil sealability of the bearing portion at the time of rotation can be improved.

Further, since the opposed region between the oil repellent agent 6 applied to the shaft body 2 and the inner peripheral surface of the bearing 1 is slightly provided, the oil repellent agent 6 is lubricated to the outside of the bearing portion 3. It will be possible to reliably control the leakage of oil.

In this embodiment, the dynamic pressure bearing device as the bearing device has been described, but the present invention is not limited to the dynamic pressure bearing device, and can be applied to a slide bearing device or a rolling bearing device.

[0021]

[Effect of the device]

 As is clear from the above description, in the bearing device of the present invention, an annular groove is provided at the shaft end portion of the facing surface of the shaft body facing the bearing, and the oil repellent agent is applied to the shaft body outside of the annular groove in the axial direction. It was done. Therefore, the oil repellent applied to the shaft body repels the lubricating oil that tends to leak out of the bearing portion, so that the lubricating oil can be prevented from leaking out of the bearing portion.

Further, the annular groove provided on the shaft body serves to prevent the above oil repellent agent from being applied to the inside of the annular groove when the oil repellent agent is applied to the shaft body. At the same time, the oil repellent applied to the shaft body is prevented from entering the bearing portion inside the annular groove. In other words, the presence of the annular groove makes it possible to easily apply the oil repellent to a predetermined area axially outside the annular groove and prevent the oil repellent from penetrating toward the inner side of the bearing portion. It is possible to keep the oil repellent in a desired area.

Furthermore, since the annular groove serves as an oil reservoir for the lubricating oil of the bearing portion, it is possible to prevent the lubricating oil from leaking out of the bearing portion.

When the annular groove is a taper groove that becomes deeper toward the outer side in the axial direction, the lubricating oil in the annular groove can be prevented by the centrifugal force applied to the lubricating oil when the shaft body rotates. The taper groove is moved inward in the axial direction along the sloped surface that is inclined inward in the axial direction. Therefore, the lubricating oil sealability of the bearing portion during the above rotation can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a dynamic pressure bearing device according to an embodiment of the present invention.

[Explanation of symbols]

 1 bearing 2 shaft body 3 bearing part 5 annular groove 6 oil repellent 8 dynamic pressure groove 10 housing

Claims (2)

[Scope of utility model registration request] 1. A bearing device in which a part of a shaft body is housed in a bearing, and a bearing portion where the bearing and the shaft body face each other is lubricated with a lubricating oil. A bearing device, wherein an annular groove extending in a circumferential direction is provided at an end portion, and an oil repellent agent is applied to a shaft body outside of the annular groove in the axial direction. 2. The bearing device according to claim 1, wherein the annular groove is a tapered groove that becomes deeper toward the outer side in the axial direction.