JP2006052768A - Rolling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a lifetime extension by preventing the invasion of a foreign matter into an interior and the leakage of a lubricant with neither gap between a seal groove and a lip even if a relative positional deviation occurs at an outer member and an inner member nor wear of the lip due to an excessive contact pressure. <P>SOLUTION: When an inner ring 2 is position deviated by (Δ) in an (X) direction to an outer ring 1, an outer ring side split seal 11 keeps intact. On the other hand, an inner ring side divided seal 21 can be displaced by following to the positional change of the inner ring 2. When the position of the inner ring 2 changes, a rib 22 for sealing, a protrusion 23 and an engaging groove 13 cooperates to perform a sealing operation to interrupt the interior of a bearing and the exterior of the bearing. The invasion of the foreign matter into the interior of the bearing and the flow-out of the lubricant sealed in the interior of the bearing are prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to rolling devices such as rolling bearings, ball screws, linear guides, and linear ball bearings that are lubricated with a lubricant such as oil or grease held in the internal space. The present invention relates to a rolling device provided with a hermetic seal that prevents entry of foreign matter (water, dust, etc.) from outside and leakage of lubricant.

  A rolling device such as a rolling bearing is composed of an outer member (in the case of a rolling bearing, “outer raceway ring”, in the case of a ball screw, “nut”, in the case of a linear guide, “slider”) and the outer side. An inward member disposed inside the member (referred to as “inner race” or “shaft” for a rolling bearing, “screw shaft” for a ball screw, and “guide rail” for a linear guide). ) And a plurality of rolling elements disposed between the inner member and the outer member, and when the outer member or the inner member rotates or linearly moves, the outer member and the inner member A rolling element rolls on a rolling surface formed opposite to the side member.

  Hereinafter, the sealing seal regarding a rolling bearing among rolling devices mentioned above is explained.

  As a prior art, the sealing seal for bearings shown in Patent Documents 1 to 3 is composed of an elastic body made of rubber or the like, which is an integral structure, and a reinforcing metal core, and is disposed at both ends of the inner ring and the outer ring, This structure prevents the entry of foreign matter (water, dust, etc.) from outside such as bearings.

  As an example of a conventional example of such a hermetic seal, a hermetic seal applied to a rolling bearing is shown in FIGS.

  Fig.5 (a) is sectional drawing of the rolling bearing which concerns on a prior art example, (b) is an expanded sectional view of the sealing seal of the principal part (upper right part of a bearing).

  FIG. 6 is an enlarged cross-sectional view of a hermetic seal of a portion surrounded by reference numeral “VI” in FIG.

  As shown in FIG. 5B, a substantially annular seal member 3 is provided between the outer ring 1 and the inner ring 2. This sealing member 3 is integrally formed in a substantially annular shape from an elastic body 4 that performs a sealing action and a cored bar 5 as a reinforcing material.

  An engagement groove 6 is formed in the outer ring 1, and the outer peripheral edge of the elastic body 4 is fixed to the engagement groove 6.

A seal groove 7 is formed in the inner ring 2, and the main lip 8 and the sub lip 9 of the elastic body 4 are in sliding contact with the seal groove 7 to form a sealing action.
Japanese Patent Laid-Open No. 11-82526 JP 2003-166550 A JP 2003-314700 A

  By the way, as shown in FIG. 6, when the inner ring 2 is displaced by (δ) in the (X) direction with respect to the outer ring 1, the upper seal member 3 in FIG. A gap is formed between the sub lip 9 and the seal groove 7, which causes entry of foreign matter and leakage of the lubricant.

  On the other hand, in the lower seal member 3 in FIG. 6, the main lip 8 and the sub lip 9 of the elastic body 4 are pressed against the seal groove 7, and the contact pressure becomes excessive, and the main lip 8 and the sub lip 9 are worn. It may be the cause of.

  The present invention has been made in view of the above-described circumstances, and even when a relative positional shift between the outer member and the inner member occurs, no gap is generated between the seal groove and the lip. It is possible to provide a rolling device that does not cause wear of the lip due to excessive contact pressure, thereby preventing intrusion of foreign matter and leakage of the lubricant and extending the life. Objective.

In order to achieve the above object, a rolling device according to claim 1 of the present invention includes an outer member,
An inner member disposed inside the outer member;
A plurality of rolling elements arranged between the inner member and the outer member;
In a rolling device comprising a hermetic seal interposed between the outer member and the inner member,
The hermetic seal has a radial rigidity set to be smaller than an axial rigidity.

In the rolling device according to claim 2 of the present invention, the sealing seal is divided into the outer member side split seal and the inner member side split seal,
When the relative position between the outer member and the inner member changes, any one of the divided seals is displaced following the change in position.

  According to the present invention, since the radial seal has a smaller rigidity in the radial direction than the rigidity in the axial direction, and the followability in the radial direction is improved, the relative position between the outer member and the inner member is improved. Even if a shift occurs, there is no gap between the seal groove and the lip, and lip wear due to excessive contact pressure does not occur.This prevents intrusion of foreign matter into the interior and leakage of lubricant. This can prevent the rolling device from extending its life.

  Hereinafter, a rolling device according to an embodiment of the present invention will be described with reference to the drawings.

  A rolling device such as a rolling bearing is composed of an outer member (in the case of a rolling bearing, “outer raceway ring”, in the case of a ball screw, “nut”, in the case of a linear guide, “slider”) and the outer side. An inward member disposed inside the member (referred to as “inner race” or “shaft” for a rolling bearing, “screw shaft” for a ball screw, and “guide rail” for a linear guide). ) And a plurality of rolling elements disposed between the inner member and the outer member, and when the outer member or the inner member rotates or linearly moves, the outer member and the inner member A rolling element rolls on a rolling surface formed opposite to the side member.

  Hereinafter, in this Embodiment, the sealing seal regarding a rolling bearing is demonstrated among the rolling devices mentioned above.

(First embodiment)
Fig.1 (a) is sectional drawing of the rolling bearing which concerns on 1st Embodiment of this invention, (b) is an expanded sectional view of the sealing seal of the principal part (upper right part of a bearing).

  FIG. 2 is an enlarged cross-sectional view of a hermetic seal of a portion surrounded by reference numeral “II” in FIG.

  As shown in FIG. 1B, a substantially annular seal member 10 is provided between the outer ring 1 and the inner ring 2. The present embodiment is characterized in that the seal member 10 is set so that its rigidity in the radial direction (X) is smaller than the rigidity in the axial direction (Y).

  Specifically, the seal member 10 is made of an elastic body such as rubber, and is divided into a substantially annular outer ring side divided seal 11 and a substantially annular inner ring side divided seal 21.

  The outer ring-side split seal 11 has fixing ribs 12 on its outer peripheral edge for engaging and fixing the engaging groove 6 formed in the outer ring 1. A fitting groove 13 is formed on the inner peripheral side of the outer ring side split seal 11 so that a sealing rib 22 described later is slidably fitted.

  The inner ring side split seal 21 has sealing ribs 22 formed on the outer periphery thereof, and is slidably fitted into the fitting groove 13 described above. A plurality of convex portions 23 are formed on the outer surface of the sealing rib 22 on the circumference. These convex portions 23 cooperate with the fitting groove 13 to perform a sealing action. That is, with such a structure, the inside of the bearing and the outside of the bearing are shut off to prevent entry of foreign matter into the bearing and outflow of the lubricant sealed inside the bearing. In addition, this convex part 23 should just be at least 1 step | paragraph.

  On the inner peripheral side of the inner ring side split seal 21, a main lip 24 and a sub lip 25 are provided which are in sliding contact with the seal groove 7 formed in the inner ring 2 and have a sealing action.

  A gap (α) is set between the bottom of the fitting groove 13 and the outer peripheral end of the sealing rib 22. A gap (β) is set between the inner peripheral end of the outer ring side split seal 11 and the outer peripheral end of the inner ring side split seal 21.

  As shown in FIG. 2, when the inner ring 2 is displaced by (Δ) in the (X) direction with respect to the outer ring 1, the gaps (α, β) are (α + Δ, β + Δ, respectively) on the upper side of FIG. 2, and on the lower side of FIG. 2, the gaps (α, β) decrease to (α−Δ, β−Δ), respectively.

  That is, the outer ring side split seal 11 maintains the state as it is, while the inner ring side split seal 21 can be displaced following the position change of the inner ring 2. When the position of the inner ring 2 changes, the sealing rib 22 and the convex portion 23 and the fitting groove 13 cooperate to form a sealing action, shut off the bearing interior and the bearing exterior, and allow foreign matter to enter the bearing. In addition, the lubricant enclosed in the bearing is prevented from flowing out.

  From the above, even when the inner ring 2 is displaced by (Δ) in the (X) direction with respect to the outer ring 1, the inner ring-side split seal 21 can be displaced following the position change of the inner ring 2. Therefore, there is no gap between the seal groove 7 and the main / sub lips 24, 25, and there is no wear of the main / sub lips 24, 25 due to excessive contact pressure. It is possible to prevent the intrusion of foreign matter and the leakage of the lubricant, thereby extending the life of the rolling bearing.

(Second Embodiment)
FIG. 3A is a cross-sectional view of a rolling bearing according to a second embodiment of the present invention, and FIG. 3B is an enlarged cross-sectional view of a hermetic seal of the main part (the upper right part of the bearing).

  FIG. 4 is an enlarged cross-sectional view of a hermetic seal of a portion surrounded by reference numeral “IV” in FIG.

  As is apparent from the drawings, this embodiment has the same basic structure as the first embodiment described above, and the differences will be described.

  In the present embodiment, as shown in FIG. 3B, a cored bar 14 and a reinforcing material 15 are attached to the inner peripheral side of the outer ring side split seal 11, and the cored bar 14 and the reinforcing material are attached. 15 is formed with a fitting groove 13. The core metal 14 is integrally formed with the outer ring side split seal 11, and the reinforcing member 15 is attached to the outer ring side split seal 11 by adhesion or welding. Other configurations are the same as those of the first embodiment described above.

  As shown in FIG. 4, when the inner ring 2 is displaced by (Δ) in the (X) direction with respect to the outer ring 1, the gaps (α, β) are (α + Δ, β + Δ, respectively) on the upper side of FIG. In the lower part of FIG. 4, the gaps (α, β) decrease to (α−Δ, β−Δ), respectively.

  That is, the outer ring side split seal 11 maintains the state as it is, while the inner ring side split seal 21 can be displaced following the position change of the inner ring 2. When the position of the inner ring 2 changes, the sealing rib 22 and the convex portion 23 and the fitting groove 13 cooperate to form a sealing action, shut off the bearing interior and the bearing exterior, and allow foreign matter to enter the bearing. In addition, the lubricant enclosed in the bearing is prevented from flowing out.

  From the above, even when the inner ring 2 is displaced by (Δ) in the (X) direction with respect to the outer ring 1, the inner ring-side split seal 21 can be displaced following the position change of the inner ring 2. Therefore, there is no gap between the seal groove 7 and the main / sub lips 24, 25, and there is no wear of the main / sub lips 24, 25 due to excessive contact pressure. It is possible to prevent the intrusion of foreign matter and the leakage of the lubricant, thereby extending the life of the rolling bearing.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

(A) is sectional drawing of the rolling bearing which concerns on 1st Embodiment of this invention, (b) is an expanded sectional view of the sealing seal of the principal part (upper right part of a bearing). It is an expanded sectional view of the seal | sticker seal of the part enclosed with the code | symbol "II" of Fig.1 (a). (A) is sectional drawing of the rolling bearing which concerns on 2nd Embodiment of this invention, (b) is an expanded sectional view of the sealing seal of the principal part (upper right part of a bearing). It is an expanded sectional view of the seal | sticker seal of the part enclosed with code | symbol "IV" of Fig.3 (a). (A) is sectional drawing of the rolling bearing which concerns on a prior art example, (b) is an expanded sectional view of the sealing seal of the principal part (upper right part of a bearing). It is an expanded sectional view of the seal | sticker seal of the part enclosed with the code | symbol "VI" of Fig.5 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Seal member 4 Elastic body 5 Core metal 6 Engagement groove 7 Seal groove 8 Main lip 9 Sub lip 10 Seal member 11 Outer ring side division seal 12 Fixing rib 13 Fitting groove 14 Core metal 15 Reinforcement material 21 Inner ring Side split seal 22 Sealing rib 23 Protrusion 24 Main lip 25 Sub lip

Claims (2)

An outer member;
An inner member disposed inside the outer member;
A plurality of rolling elements arranged between the inner member and the outer member;
In a rolling device comprising a hermetic seal interposed between the outer member and the inner member,
The rolling device is characterized in that the radial seal has a smaller rigidity in the radial direction than the rigidity in the axial direction. The sealing seal is divided into the outer member side division seal and the inner member side division seal,
2. The rolling device according to claim 1, wherein when the relative position between the outer member and the inner member changes, any one of the divided seals is displaced following the change in position.

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