JPH051023U - Sealed rolling bearing - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing changes in internal pressure of sealed type rolling bearings,
Improve bearing life. [Structure] A filter seal 15 is installed at both ends between the inner ring 13 and the outer ring 12 of the bearing.
The outer ring 16 and the inner ring 17 sandwich an annular seal material 18 from both sides, and the outer ring 16 is press-fitted and fixed in the outer ring 12 to form the seal material 1.
The inner circumference of 8 is brought into sliding contact with the inner ring 13, and the inside of the bearing is sealed by the filter seal 15 so that grease does not leak. Since the sealing material 18 allows the air to pass therethrough, it is possible to prevent a change in the internal pressure of the bearing, and the sealing material 18 prevents dust and water from entering to extend the life of the bearing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hermetically sealed rolling bearing, and more particularly to a structure of a filter seal which can prevent the ingress of water and dust into the inside of the bearing and suppress the rise of internal pressure.

[0002]

[Prior Art]

 Sealed rolling bearings that are grease-lubricated have seals installed at both ends between the inner and outer rings to prevent grease leakage.

As a seal structure in a conventional sealed type rolling bearing, as shown in FIG. 4, an annular seal plate 3 having a U-shaped cross section is provided at both ends between an outer ring 1 and an inner ring 2 in a double row tapered roller bearing. Assembled by press-fitting into the outer ring 1 and forming a labyrinth 4 between the outer peripheral surface of the seal plate 3 and the inner ring 2, or as shown in FIG. 5, inside the shield plate 5 press-fitted and fixed to the inner periphery of the outer ring 1. There is one in which an elastic sealing material 6 which is in sliding contact with the outer peripheral surface of the inner ring 2 is attached to the circumference.

[0004]

[Problems to be solved by the device]

 By the way, when the internal pressure of the bearing rises due to temperature rise, etc., the former seal structure shown in FIG. 4 can release the internal pressure to the outside by the labyrinth 4, but there is a disadvantage that grease leaks together with the internal pressure. .

Further, in the latter seal structure shown in FIG. 5, the seal material 6 escapes outward due to an increase in internal pressure, and similarly grease leaks.

When the double-row tapered roller bearing is used in a dust atmosphere or a place where water is splashed, the labyrinth 4 cannot completely prevent dust and water from entering due to the presence of the labyrinth 4. There is.

Further, while the latter seal structure prevents moisture from entering, dust trapped between the seal material 6 and the inner ring 2 abrades the lip portion of the seal material 6, which shortens the seal life. However, there is a problem that the life of the bearing is shortened.

Therefore, in order to solve the above-mentioned problems, the present invention can prevent the increase of the internal pressure by freeing the movement of the air inside and outside the bearing, and at the same time, prevent the grease leakage inside the bearing, It is an object to provide a hermetically sealed rolling bearing that can prevent the intrusion of water and dust.

[0009]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention incorporates filter seals at both ends between an inner ring and an outer ring that are fitted via rolling elements, and this filter seal is made of a polyolefin microporous sheet. It employs a structure in which both sides of the used sealing material are sandwiched between an inner ring and an outer ring.

[0010]

[Action]

 Since the sealing material of the filter seals installed at both ends between the inner ring and the outer ring is made of polyolefin microporous sheet, it allows air to pass freely and allows the increased internal pressure to escape to the outside. Since the above sealing material does not pass liquid or dust, it is possible to prevent grease leakage in the bearing.

Further, since the sealing material does not allow liquid or dust to pass therethrough, it is possible to reliably prevent the ingress of external water or dust.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings.

As shown in FIGS. 1 and 2, the hermetically sealed rolling bearing 11 exemplifies a double row tapered roller bearing, in which a tapered roller 14 is interposed between an outer ring 12 and an inner ring 13, and an outer ring 12 and an inner ring 13 are provided. Filter seals 15 are incorporated at both ends of the space.

The filter seal 15 includes an outer ring 16 formed in an L-shaped cross section and an outer ring 16 sandwiching an annular seal member 18 between opposing surfaces of an inner ring 17 fitted inside the outer ring 16. Is press-fitted and fixed to the inner circumference of the end of the outer ring 12, and the inner circumference of the seal material 18 is brought into sliding contact with the outer peripheral surface of the end of the inner ring 13.

The sandwiching of the seal member 18 by the outer ring 16 and the inner ring 17 is provided with a bent portion 19 toward the inner surface near the inner circumference of the inner ring 17 and a portion 18a and a bent portion 19 for strongly compressing the seal member 18. Therefore, the portion 18b that is compressed more weakly is a two-stage type so that the inner peripheral side of the sealing member 18 protruding from the outer ring 16 has a sufficient waist.

Further, a tubular portion 20 extending in the inner axial direction of the bearing is formed continuously on the inner peripheral side of the inner ring 17, and a labyrinth 21 is formed on the outer periphery of the inner ring 13 by the tubular portion 20 so that Prevents leakage of grease filled in the outside.

The sealing material 18 is formed using a polyolefin microporous sheet. This sheet has a function of allowing air to pass therethrough but not passing dust or water.

In the example shown in FIG. 3, the inner peripheral portion of the inner ring 17 is inclined toward the inner side, and a rubber seal 22 slidingly contacting the inner ring 13 is attached to this inner peripheral portion to improve the sealing effect of preventing grease leakage. I am making it.

Although the rolling bearing 11 is a double-row tapered roller bearing in the illustrated case, it may be of any other type such as a ball bearing as long as it is grease-lubricated.

The rolling bearing of the present invention has the above-mentioned structure, and the grease filled between the outer ring 12 and the inner ring 13 is sealed by the filter seals 15 installed at both ends to prevent the grease from leaking. When the internal pressure of the bearing rises, air escapes to the outside through the fine holes in the seal material 18 to prevent changes in the internal pressure of the bearing, and when the pressure inside the bearing returns to normal pressure, the outside air will block the seal material 18. It will pass through and penetrate into the bearing.

When the bearing is used in a dust atmosphere or a place where water is splashed, the seal material 18 prevents dust and water from entering and improves the life of the bearing.

[0022]

【effect】

 As described above, according to the present invention, the polyolefin microporous sheet is used as the sealing material of the filter seal installed at the end portion between the inner ring and the outer ring of the bearing, so that the sealing material can pass air. Therefore, the dust and water are blocked, so that it is possible to prevent the grease enclosed in the bearing from leaking to the outside and at the same time prevent the internal pressure change in the bearing.

Further, even when the bearing is used in an atmosphere of dust or a place exposed to water, the sealing material can completely prevent intrusion of dust and water, and can improve the life of the bearing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rolling bearing according to the present invention.

FIG. 2 is an enlarged vertical sectional view of the main part of the above.

FIG. 3 is an enlarged vertical sectional view of a main part showing another example of the above.

FIG. 4 is a vertical sectional view showing a conventional rolling bearing.

FIG. 5 is a vertical cross-sectional view showing another conventional example.

[Explanation of symbols]

 11 Sealing type rolling bearing 12 Outer ring 13 Inner ring 14 Tapered roller 15 Filter seal 16 Outer ring 17 Inner ring 18 Sealing material

Claims (1)

[Claims for utility model registration] [Claim 1] Filter seals are incorporated at both ends between an inner ring and an outer ring fitted through rolling elements, and the filter seal is a seal using a polyolefin microporous sheet. A sealed type rolling bearing formed by sandwiching both sides of a material with an inner ring and an outer ring.