JP-2026074693-A - Brushed bearing

Abstract

[Problem] The objective is to provide a brushed bearing that can effectively prevent bearing malfunctions caused by foreign matter generated by the sliding of the brushes, while also providing protection against electromagnetic noise and electrolytic corrosion, thereby extending the lifespan of the bearing. [Solution] The configuration of the brushed bearing (bearing 100) according to the present invention comprises an outer ring 110, an inner ring 120, rolling elements (balls 130) that roll between the outer ring 110 and the inner ring 120, and a seal 140 that connects the outer ring 110 and the inner ring 120. The seal 140 is characterized by having a resin ring 142 fitted to one of the outer ring 110 or the inner ring 120, a coil 144 embedded in the resin ring 142 and electrically connected to one of the outer ring 110 or the inner ring 120, a magnetic core 146 inserted into the coil 144, and a metal brush 148 connected to the coil 144 and sliding on the other of the outer ring 110 or the inner ring 120. [Selection Diagram] Figure 1

Inventors

• 堀越 大裕

Assignees

• 株式会社不二越

Dates

Publication Date

20260507

Application Date

20241021

Claims (2)

1. Outer ring and, Insider, A rolling element that rolls between the outer ring and the inner ring, The outer ring and the inner ring are connected by a seal, The seal is A resin ring fitted to either the outer ring or the inner ring, A coil embedded in the resin ring and electrically connected to either the outer ring or the inner ring, The magnetic core inserted into the coil, A brushed bearing characterized by having a metal brush connected to the coil and sliding against the other of the outer ring or the inner ring.
2. The seal has a conductive fitting plate positioned on the fitting surface of the resin ring, The brushed bearing according to claim 1, characterized in that the mating plate is electrically connected to the coil.

Description

This invention relates to a brushed bearing. In recent years, with the advancement of electric vehicles (EVs) and hybrid vehicles (HVs), the number of high-voltage components installed in a single automobile is increasing. As the number of high-voltage components increases, so does the electromagnetic interference between them. Electromagnetic interference, if transmitted to electronic devices such as computers, navigation systems, communication devices, and in-car radios, can adversely affect the operation of these devices as electromagnetic noise. Therefore, countermeasures against electromagnetic noise in automobiles are in demand. A common method used to mitigate electromagnetic noise is to ground stray currents (noise currents) generated by electromagnetic interference to the surrounding casing, often using bearings as the pathway. However, when current from high-voltage components flows through bearings, electrolytic corrosion occurs on the surfaces of the bearing's rolling elements and the raceways of the outer and inner rings, contributing to damage. For example, Patent Document 1 discloses a rolling bearing in which a plurality of rolling elements are held and interposed between an inner ring and an outer ring by a cage, and a non-contact sealing plate that seals the bearing space between the inner ring and the outer ring is attached to one of the raceways of the inner ring or the outer ring, characterized in that a discharge brush is provided on the sealing plate to form a discharge path in close proximity to the other raceway. Japanese Patent Publication No. 2007-146966 This is a diagram illustrating a brushed bearing according to this embodiment.This diagram illustrates variations in the shape of the inner ring.This figure illustrates another example of a brushed bearing according to this embodiment. 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. Figure 1 illustrates a brushed bearing (hereinafter referred to as bearing 100) according to this embodiment. Figure 1(a) illustrates the overall configuration of bearing 100 in this embodiment. Figure 1(b) is a schematic diagram illustrating the seal 140 in Figure 1(a). As shown in Figure 1(a), the bearing of this embodiment comprises an outer ring 110, an inner ring 120, rolling balls 130, and a seal 140. The rolling balls 130 roll between the outer ring 110 and the inner ring 120. The seal 140 electrically connects the outer ring 110 and the inner ring 120. As shown in Figure 1(b), the seal 140 of the bearing 100 in this embodiment is composed of a resin ring 142, a coil 144, a magnetic core 146, a metal brush 148, and a fitting plate 150. While this embodiment illustrates a configuration with 11 coils 144, 146, 148, and fitting plates 150, the number is not limited to this configuration and can be changed as appropriate. As shown in Figure 1(a), the resin ring 142 is positioned between the outer ring 110 and the inner ring 120, and in this embodiment, it is fitted onto the outer ring 110. The resin ring 142 is the base into which the coil 144 is embedded. In this embodiment, since the resin ring 142 is fitted onto the outer ring 110, the coil 144 is electrically connected to the outer ring 110. A magnetic core 146 is inserted into the coil 144, and a metal brush 148 that slides against the inner ring 120 is connected to it. The metal brush 148 can be made of, for example, iron, stainless steel, brass, copper, or an alloy. In this embodiment, a conductive fitting plate 150, which serves as an electrode, is placed on the fitting surface 142a of the resin ring 142, and the fitting plate 150 contacts and conducts electricity with the coil 144. In the bearing 100 shown in Figure 1, when a noise current E is generated due to electromagnetic interference, the noise current E flows between the outer ring 110 and the inner ring 120 through the coil 144 and the metal brush 148, and is grounded to the surrounding components (not shown) of the bearing 100. This allows for electromagnetic noise and electrolytic corrosion countermeasures in the bearing 100. At this time, the placement of the fitting plate 150 on the fitting surface 142a of the resin ring 142 enhances the conductivity between the outer ring 110 and the coil 144. Furthermore, when noise current E flows through coil 144, a magnetic field is generated in coil 144. This magnetic field causes the magnetic core 146 embedded in c