JP2006349043A - Sealed type rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed type rolling bearing capable of sealing doubly by two contact seals and suppressing wear of a lip due to occurrence of rust on a seal slide-contact face of the contact seal on an outer side. <P>SOLUTION: A bearing space between an inner ring 1 and an outer ring 2 is doubly sealed by two inner and outer contact seals 5, 6, and the seal slide-contact face 7a in contact with the lip 6c of the contact seal 6 on the outer side is provided on an annular member 7 made of stainless steel and fitted into an inner peripheral face of the outer ring 2 to prevent occurrence of rust on the slide-contact face 7a of the contact seal 6 on the outer side and suppress wear of the lip 6c of the contact seal 6 on the outer side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hermetic rolling bearing in which a bearing space between an inner ring and an outer ring is sealed with a contact seal.

  Rolling bearings used in an environment where dust, water, etc. are scattered have a sealed type rolling bearing in which the bearing space is sealed with a contact seal in order to prevent them from entering the bearing space between the inner ring and the outer ring. It is used. The contact seal seals the bearing space by bringing a lip formed of an elastic member such as rubber into contact with a seal sliding contact surface of an inner ring or an outer ring.

  This type of sealed-type rolling bearing is provided with one contact seal on each side of the bearing space (see, for example, Patent Document 1), or on the outside of the contact seals installed one by one. Some have a contact shield (see, for example, Patent Documents 2 and 3). In what is described in Patent Document 2, a shield (shielding plate) is divided into one attached to an inner ring and one attached to an outer ring, and a labyrinth gap is formed between these divided shields. Moreover, in what was described in patent document 3, the labyrinth clearance gap was formed between the shield (cover) and the inner contact seal.

  On the other hand, since the rolling bearing used for the center axis | shaft support part of a propeller shaft of a motor vehicle, the joint axis | shaft support part of a drive shaft, etc. is arrange | positioned under the floor part of a vehicle, it receives scattering of muddy water and rain water.

Japanese Utility Model Publication No. 7-10555 (Fig. 1) No. 8-3710 (Figs. 1 and 2) JP 2001-50288 A (Figs. 1, 3 to 10)

  When a sealed rolling bearing such as that described in Patent Document 1 is used at a site that receives splashes of muddy water as described above, the scattered muddy water adheres to the sliding contact portion of the contact seal, and lip is caused by mud in the muddy water. Further, there is a problem that the seal sliding contact surface is worn and the sealing performance is remarkably lowered.

  The sealed rolling bearings described in Patent Document 2 and Patent Document 3 can prevent muddy water from directly adhering to the sliding contact portion of the contact seal by the shield, but since the shield has a non-contact gap portion, The gap penetrates between the shield and the contact seal through the labyrinth gap. Thus, the muddy water that has entered between the shield and the contact seal increases in the concentration of the mud due to the evaporation of moisture. Wear of the seal sliding contact surface is promoted. For this reason, it is not possible to sufficiently prevent a decrease in sealing performance.

  In order to solve such a problem, the applicant of the present invention seals the bearing space twice with the inner and outer contact seals, blocks the scattered muddy water with the outer contact seal, and removes the inner contact seal. A sealed type rolling bearing in which muddy water is prevented from adhering to the sliding contact portion has been proposed (Japanese Patent Application No. 2005-29116).

  In such a sealed rolling bearing in which the bearing space is double-sealed with the inner and outer contact seals, rust is generated on the seal sliding surface of the outer contact seal that directly receives the splash of muddy water and rainwater. There is a problem that the lip of the outer contact seal that is in sliding contact with the generated seal sliding contact surface is easily worn. As the lip wear of the outer contact seal progresses, the outer contact seal does not sufficiently block muddy water and rainwater, and the sealing performance of the sealed type rolling bearing that is double-sealed with two contact seals is sufficient. Will not be alive.

  Accordingly, an object of the present invention is to suppress the wear of the lip due to the occurrence of rust on the seal sliding surface of the outer contact seal in a sealed type rolling bearing that is doubly sealed with two contact seals.

  In order to solve the above-described problems, the present invention doubles the bearing space between the inner ring and the outer ring with two inner and outer contact seals that make the lip formed of an elastic member contact the seal sliding contact surface. In a hermetically sealed rolling bearing, a structure in which a seal sliding contact surface that is in contact with a lip of the outer contact seal is provided on an annular member made of stainless steel fitted to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring. It was adopted.

  That is, the sliding contact surface of the outer contact seal is provided on the annular member made of stainless steel fitted to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring. This prevents the occurrence of rust and prevents wear on the lip of the outer contact seal.

  The inner contact seal has a stainless steel core that is locked to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring to which the stainless steel annular member is fitted, and these stainless steel By integrally forming the annular member and the cored bar, a separate annular member is not required, the number of parts can be reduced, and the manufacturing cost can be reduced.

  In the sealed type rolling bearing of the present invention, the seal sliding contact surface with which the lip of the outer contact seal contacts is provided on the annular member made of stainless steel fitted to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring. Prevents the occurrence of rust on the sliding surface of the contact seal, suppresses the wear of the lip of the outer contact seal, and achieves excellent sealing performance of the sealed type rolling bearing that is double-sealed with two contact seals You can make full use of it.

  The inner contact seal has a stainless steel core that is locked to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring to which the stainless steel annular member is fitted, and these stainless steel By integrally forming the annular member and the cored bar, a separate annular member is not required, the number of parts can be reduced, and the manufacturing cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. As shown in FIG. 1, this sealed type rolling bearing has a bearing space in which a ball 3 is held by a cage 4 between an inner ring 1 and an outer ring 2, and two contact seals 5, 6 on the inner side and outer side 2 Heavyly sealed ball bearings.

  As shown in FIG. 2, each of the contact seals 5 and 6 includes cored bars 5a and 6a and elastic members 5b and 6b, respectively. The inner contact seal 5 is fixed to an engaging groove 2 a provided on the inner peripheral surface of the outer ring 2 by an elastic member 5 b, and its lip 5 c comes into contact with a seal sliding contact surface 1 a provided on the outer peripheral surface of the inner ring 1. ing.

  The outer contact seal 6 is a stainless steel in which a cored bar 6a is fitted and fixed to a stepped portion 1b provided on the outer circumferential surface of the inner ring 1 and its lip 6c is fitted to the inner circumferential surface of the outer ring 2. It is in contact with the seal sliding contact surface 7a provided on the annular member 7 made of SUS430. Therefore, the seal sliding contact surface 7a does not generate rust even when directly splashed with muddy water or rainwater, and wear of the lip 6c of the outer contact seal 6 is suppressed.

  FIG. 3 shows a second embodiment. This sealed-type rolling bearing is also a ball bearing similar to that of the first embodiment, and the inner contact seal 5 is fitted to the stepped portion 2b provided on the inner peripheral surface of the outer ring 2. The difference is that the metal core 5a is made of stainless steel SUS430 and is integrally formed with the annular member 7 provided with the seal sliding contact surface 7a. Other parts are the same as those of the first embodiment.

  In each of the above-described embodiments, the annular member provided with the seal sliding contact surface of the outer contact seal is formed of SUS430. However, the annular member may be formed of other stainless steel such as SUS304.

  Further, in each of the above-described embodiments, the sealed type rolling bearing is a ball bearing, but the sealed type rolling bearing according to the present invention can also be used for other types of rolling bearings such as a roller bearing. Further, the forms of the inner and outer contact seals are not limited to those of the embodiment.

Longitudinal sectional view showing a first embodiment of a sealed rolling bearing Sectional drawing which expands and shows the principal part of FIG. Sectional drawing which expands and shows the principal part of 2nd Embodiment of a sealing type rolling bearing

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Seal sliding contact surface 1b Step part 2 Outer ring 2a Locking groove 2b Step part 3 Ball 4 Cage 5, 6 Contact seal 5a, 6a Core metal 5b, 6b Elastic member 5c, 6c Lip 7 Ring member 7a Seal sliding contact surface

Claims (2)

  In a sealed type rolling bearing in which a bearing space between an inner ring and an outer ring is doubly sealed with two inner and outer contact seals in which a lip formed of an elastic member contacts a seal sliding contact surface, the outer contact seal A seal-type rolling bearing having a seal sliding contact surface with which a lip of the ring contacts is provided on an annular member made of stainless steel fitted to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring.   The inner contact seal has a stainless steel core that is locked to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring to which the stainless steel annular member is fitted, and these stainless steel The hermetic rolling bearing according to claim 1, wherein the annular member and the cored bar are integrally formed.

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