JP-2026075296-A - Creep-resistant bearing

JP2026075296AJP 2026075296 AJP2026075296 AJP 2026075296AJP-2026075296-A

Abstract

[Problem] The objective is to provide a creep-resistant bearing that can prevent rotational creep without adding any parts and can suppress wear between the outer ring and the housing caused by rotational creep. [Solution] The creep-resistant bearing (bearing 100) according to the present invention comprises an outer ring 110, an inner ring 120, and rolling elements (balls 130) that roll between the outer ring 110 and the inner ring 120, and is characterized in that when one of the outer ring 110 or the inner ring 120 is a stationary ring and the other is a rotating ring, the mating surface of the mating member to which the stationary ring is attached has lathe marks 114 remaining from when the mating surface was machined on a lathe. [Selection Diagram] Figure 1

Inventors

居島啓一

Assignees

株式会社不二越

Dates

Publication Date: 20260508
Application Date: 20241022

Claims (2)

Outer ring and, Insider, A rolling element that rolls between the outer ring and the inner ring, Equipped with, A creep-resistant bearing characterized in that, when one of the outer ring or inner ring is a fixed ring and the other is a rotating ring, the mating surface of the fixed ring to the mating member to which the fixed ring is attached has lathe marks remaining from when the mating surface was machined on a lathe.
A creep-resistant bearing characterized by the formation of a black scale on the aforementioned turn marks.

Description

This invention relates to a creep-resistant bearing. In bearings where the bearing is fitted into a housing and the shaft is inserted into the inner ring, causing the inner ring to rotate with the shaft, various types of creep can occur. One example is rotational creep. Figure 5 illustrates rotational creep. Rotational creep is a phenomenon where, in a configuration where the outer ring 30 is loosely fitted into the housing 40 (clearance fit), the outer surface of the outer ring 30 slides within the housing 40 when the internal torque of the bearing 30a becomes greater than the friction torque of the outer surface of the bearing 30a (high rotation, light load). During rotational creep, a lubricating oil film forms between the outer ring 30 and the housing 40, resulting in almost no wear. However, if a heavy load is applied while creep is occurring, the creep stops, and the problem arises when wear occurs on the contact surface between the outer ring 30 and the housing 40 at the moment the creep stops. One technique for suppressing rotational creep involves fitting an O-ring to the outer circumferential surface of the outer ring. For example, Patent Document 1 discloses a rolling bearing comprising: an outer ring having an outer ring raceway surface on its inner circumferential surface; an inner ring having an inner ring raceway surface on its outer circumferential surface; and a plurality of rolling elements rotatably arranged between the outer ring raceway surface and the inner ring raceway surface; wherein at least one annular groove is formed on the outer circumferential surface of the outer ring over its entire circumference, and an annular elastic body is fitted into the annular groove; and the rolling bearing, used in a lubricating oil environment, is characterized in that, when the outer ring is internally fitted and supported in the outer ring support portion, the compression ratio of the annular elastic body is set to 15% to 30%, and the hardness of the annular elastic body is set to HS70 or less. Japanese Patent Publication No. 2015-215061 This is a diagram illustrating the creep-resistant bearing according to this embodiment.This diagram illustrates the manufacturing method for the outer ring of the bearing in this embodiment.This is a diagram illustrating a conventional method for manufacturing the outer ring of a bearing.This diagram illustrates a comparison between the outer ring of this embodiment and a conventional outer ring.This is a diagram illustrating the phenomenon of "following creep." 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 the 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 the illustrations. Figure 1 illustrates a creep-resistant bearing (hereinafter referred to as bearing 100) according to this embodiment. For ease of understanding, a portion of bearing 100 is cut away to show its internal structure. As shown in Figure 1, bearing 100 of this embodiment comprises an outer ring 110, an inner ring 120, and balls 130, which are rolling elements that roll between them. In many cases, the bearing 100 has one of its outer rings 110 and inner ring 120 used as a fixed ring and the other as a rotating ring, and rotational creep occurs in the clearance-fitted fixed ring. In this embodiment, the outer ring 110 is a fixed ring clearance-fitted to the mating component, the housing (not shown), and the inner ring 120 is a rotating ring that holds the shaft (not shown). A characteristic feature of the bearing 100 in this embodiment is that the outer ring 110, which is a fixed ring, has turning marks 114 remaining on its mating surface with the housing, i.e., its outer circumferential surface 112, which was machined on a lathe. The turning marks 114 on the outer circumferential surface 112 of the outer ring 110 have black scale generated by heat treatment (quenching and tempering) that remains unpolished. Polished surfaces 116, which have been polished with a grinding wheel or the like, are formed between the turning marks 114, and thin turning marks 114 and thin polished surfaces 116 are arranged alternately. In other words, the outer circumferential surface 112 of the outer ring 110 is composed of turning marks 114 and polished surfaces 116. Figure 2 illustrates the manufacturing method of the outer ring 110 of the bearing 100 in this embodiment. Figure 3 illustrates the manufacturing method of the outer ring 30 of a conventional bearing. In the conventional method for manufacturing the ou