Seal structure of rolling bearing

A sealing device and rolling bearing technology, applied in the directions of engine sealing, bearings, ball bearings, etc., can solve problems such as high torque, and achieve the effect of reducing torque and improving sealing.

Inactive Publication Date: 2007-11-07
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in high torque

Method used

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  • Seal structure of rolling bearing
  • Seal structure of rolling bearing
  • Seal structure of rolling bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]The rolling bearing of Embodiment 1 shown in FIGS. 1 and 2 has circumferential seal grooves 4 formed in lands 3 on both sides of raceway grooves 2 formed in the radially outer surface of inner ring 1 . Seal member fixing grooves 6 are formed in the radially inner surface of the outer ring 5 so as to face the corresponding seal grooves 4 . Track grooves 7 are formed in the radially inner surface of the outer ring 5 so as to face the track grooves 2 . Balls 8 are arranged between the raceway grooves 2 and 7 . The balls 8 are circumferentially separated from each other by a predetermined distance by a cage 9 .

[0064] An annular sealing member 11 is provided between each sealing groove 4 and the corresponding sealing member fixing groove 6 . The sealing member 11 is formed by molding synthetic rubber on the metal core 12 . Their outer edges 10 are fitted in and fixed to the respective seal member fixing grooves 6 . The inner diameter R1 of the metal core 12 is larger t...

Embodiment 2

[0086] The sealing device of the second embodiment shown in FIG. 5 is basically the same as that of the first embodiment. The difference is that the radial position of the branch portion 15 is determined above the extension L of the guide surface 3 and most of the auxiliary lip 17 is located above the extension L (ie, radially outside the sealing member 11 ). The radius R3 of the largest diameter portion of the auxiliary lip 17 is greater than the radius R2 of the guide surface 3 . With this configuration, although the volume of the grease pool 24 is increased, a problem arises that the end surface of the auxiliary lip 17 becomes an obstacle to the flow of grease from the guide face 3 to the radially outer surface of the auxiliary lip 17 . In order to avoid this problem, on the tip of the lip 17, a tapered surface 27 having an inclination angle θ of not less than 90° with respect to the guide surface 3 is formed.

[0087] The radially inner surface of the auxiliary lip 17 is ...

Embodiment 3 and 4

[0091] Embodiment 3 shown in FIG. 7 and Embodiment 4 shown in FIG. 8 were invented before Embodiments 1 and 2. FIG. They are disclosed as comparative examples of Examples 1 and 2.

[0092] In Embodiment 3 shown in FIG. 7, each seal member 11 has only the main seal lip. The main sealing lip 16 has a constant width and is formed at its distal end with a transverse end surface 30 . The outer corners of the end surface 30 are in contact with the outer groove wall 21 of the sealing groove 4 to define a contact seal 25 . This embodiment differs from embodiments 1 and 2 in that no auxiliary lip is provided.

[0093] It was confirmed that when the interference of the main lip 16 was set substantially the same as in Embodiments 1 and 2, the torque value C was substantially the same as the value A in FIG. 3 . As shown by the letter C in Fig. 4, the airtightness is about 1 / 2 that of the existing product X. Therefore, it was found that the airtightness was inferior to A and B. This m...

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PUM

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Abstract

A contact type seal structure of a rolling bearing capable of reducing torque and improving sealing by improving the lip structure of a seal member. A branch part (15) is formed on the seal member (11) at a height nearly equal to the height of an inner ring land (3). A main lip (16) is formed of the portion of the seal member projected from the branch part (15) in the radial inner direction, and a contact seal (25) is formed by bringing the tip part of the main lip (16) into contact with the outer groove wall (21) of a seal groove (4). An auxiliary lip (17) is formed of the portion of the seal member projected from the branch part (15) in the axial inner direction, and a labyrinth seal (19) is formed between the tip part of the auxiliary lip (17) and the inner groove wall (18) of the seal groove.

Description

technical field [0001] The present invention relates to seals for rolling bearings, in particular to the shape of the lips of the sealing members forming the contact seals. Background technique [0002] The rolling bearing is provided with a sealing device for preventing the leakage of grease in the bearing and the entry of foreign substances from the outside. There are two types of such seals. One class includes metal shielding members mounted in bearings. Another category includes sealing members mounted in bearings and made of elastic material such as synthetic rubber. The present invention belongs to the latter category, namely to the category including the sealing member. This latter category is further divided into non-contact and contact, in which a sealing member is fixed to one of the bearing rings while facing the other bearing ring, between the sealing member and the A labyrinth gap is defined between the other bearing rings, and in the contact type, the seali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/78F16C33/80
CPCF16J15/3456F16C33/7856F16C19/06F16C33/782F16C33/7853F16J15/3232F16C2300/02
Inventor 石田光平泽义光川北笃史清水雄介
Owner NTN CORP
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