JP-2026075799-A - Sealed bearing

Abstract

[Problem] The objective is to provide a sealed bearing that can effectively suppress lip wear during high-speed rotation of the bearing and prevent damage caused by it. [Solution] The sealed bearing (bearing 100) according to the present invention is a sealed bearing that rotatably supports the shaft end Sa, which is the end of a shaft S, and comprises an outer race 110, an inner race 120, rolling elements (balls 130) that roll between the outer race 110 and the inner race 120, and a seal 140 that seals the space between the outer race 110 and the inner race 120, wherein the seal 140 is fitted onto the outer race 110 and has a lip 146 that slides with the inner race 120, and the contact point between the lip 146 and the inner race 120 is located inside the outer circumferential surface Sb of the shaft S. [Selection Diagram] Figure 1

Inventors

• 寺田 貴雄

Assignees

• 株式会社不二越

Dates

Publication Date

20260511

Application Date

20241023

Claims (4)

1. A sealed bearing that rotatably supports the end of a shaft, Outer lace and, Inner lace and A rolling element that rolls between the outer race and the inner race, The outer race and the inner race are sealed together, The seal is fitted onto the outer race and has a lip that slides against the inner race, A sealed bearing characterized in that the contact point between the lip and the inner race is located inside the outer circumferential surface of the shaft.
2. The inner race comprises a cylindrical portion that fits onto the outer circumferential surface of the shaft and a flange portion that faces the end of the shaft. The sealed bearing according to claim 1, characterized in that the contact point is located on the flange portion.
3. The inner race is cylindrical in shape and fits inside the shaft end. The sealed bearing according to claim 1, characterized in that the contact points are arranged on the outer surface of the cylindrical shape.
4. A sealed bearing that rotatably supports the end of a shaft, Outer lace and, An inner race fitted to the outer surface of the shaft, A rolling element that rolls between the outer race and the inner race, The outer race is fitted with a seal that seals the space between the inner races, The seal is fitted into the outer race and has a lip that slides against the shaft, A sealed bearing characterized in that the contact point between the lip and the shaft is located at the shaft end or on the outer circumferential surface of the shaft.

Description

This invention relates to a sealed bearing that rotatably supports the end of a shaft. Bearings are sometimes equipped with seals to prevent foreign matter from entering between the outer and inner rings and to prevent lubricant leakage. For example, Patent Document 1 discloses "an electrically conductive rolling bearing comprising an outer ring having an outer ring raceway on its inner circumferential surface, an inner ring having an inner ring raceway on its outer circumferential surface, a plurality of rolling elements rotatably mounted between these outer and inner ring raceways, and a circular seal ring located between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring, for closing the end openings of the bearing's internal space where these rolling elements are installed." In the electrically conductive rolling bearing described in Patent Document 1, "one of the inner and outer peripheral edges of the seal ring is locked around its entire circumference to one of the ends of the inner ring and the outer ring, while the other peripheral edge is slidably contacted around its entire circumference to the surface of the other end of the outer ring, and furthermore, the outer ring and the inner ring are electrically connected." Japanese Patent Publication No. 2009-264401 This is a diagram illustrating a sealed bearing according to the first embodiment.This is a diagram illustrating a sealed bearing according to a second embodiment.This is a diagram illustrating a sealed bearing according to the third embodiment.This is a diagram illustrating a conventional sealed bearing. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely illustrative to facilitate understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from illustration or description. (Conventional sealed bearings) First, the prior art will be explained using Figure 4. Figure 4 is a diagram illustrating a conventional sealed bearing (hereinafter referred to as bearing 10). The conventional bearing 10 illustrated in Figure 4 rotatably supports the shaft end Sa, which is the end of the shaft S. The bearing 10 is composed of an outer race 12, an inner race 14, balls 16 which are rolling elements that roll between the outer race 12 and the inner race 14, and a seal 20. The seal 20 seals the space between the outer race 12 and the inner race 14. The seal 20 is composed of a core metal 22 and an elastic material 24 supported by it, with a lip 26 formed at the tip of the elastic material 24. One end (the base end) of the seal 20 is fitted into the outer race 12, and the other end (the tip) of the seal 20 slides against the inner race 14 at the lip 26. In the conventional bearing 10 illustrated in Figure 4, the contact point P0 between the lip 26 and the inner race 14 is located on the outer race 12 side of the outer circumferential surface Sb of the shaft S. In other words, the contact point P0 is further from the center of the shaft S than the outer circumferential surface Sb. This is because the contact point P0 is on the outer circumferential surface (outer race 12 side) of the inner race 14, and since the inner race 14 has thickness, the contact point P0 is inevitably further from the center of the shaft S than the outer circumferential surface Sb of the shaft S. In such a conventional configuration, wear and premature failure of the lip 26 have become a problem as bearing diameters and rotational speeds increase. (First Embodiment) Figure 1 is a diagram illustrating a sealed bearing (hereinafter referred to as bearing 100) according to the first embodiment. The bearing 100 of the first embodiment shown in Figure 1 rotatably supports the shaft end Sa, which is the end of the shaft S. The bearing 100 is composed of an outer race 110, an inner race 120, balls 130 which are rolling elements that roll between the outer race 110 and the inner race 120, and a seal 140. The seal 140 seals the space between the outer race 110 and the inner race 120. The seal 140 is composed of a core metal 142 and an elastic material 144 supported by it, with a lip 146 formed at the tip of the elastic material 144. A feature of the bearing 100 in the first embodiment is that the inner race 120 has a cylindrical portion 122 that fits onto the outer circumferential surface Sb of the shaft S, and a flange portion 124 that faces the shaft end Sa. The flange portion 124 extends from the cylindrical portion 122 toward the center of the shaft S in a direction that covers the sha