WO-2026094454-A1 - RADIAL ROLLER BEARING

Abstract

The present invention provides a radial roller bearing that can prevent rollers from falling out and allow for improvements in handleability, load bearing, and lubricity.　This radial roller bearing is characterized by comprising: a plurality of rollers that roll on an inner circumferential surface of a housing and/or an outer circumferential surface of a shaft; and a meltable retainer that holds the plurality of rollers in a pre-use state and is melted in an in-use state to allow the plurality of rollers to roll.

Inventors

• MIURA KAZUYA
• KAKUDA Koichi

Assignees

• 日本精工株式会社

Dates

Publication Date

20260507

Application Date

20250912

Priority Date

20241028

Claims (5)

1. Multiple rollers that roll on at least one of the inner surface of the housing and the outer surface of the shaft, A meltable retaining material that holds the plurality of rollers in its pre-use state and melts during use to enable the rolling of the plurality of rollers, A radial roller bearing characterized by having the following features.
2. The radial roller bearing according to claim 1, characterized in that the meltable retaining material can be melted by a lubricant or heat.
3. The holder further comprises a holder having multiple pockets for accommodating the multiple rollers, The radial roller bearing according to claim 1, characterized in that the plurality of rollers are held by the molten retaining material and the retainer.
4. The radial roller bearing according to claim 1, further comprising a raceway ring having a raceway surface on its inner or outer circumferential surface.
5. The aforementioned meltable retaining material is A pair of annular ends are formed in an annular shape so as to abut the axial ends of the plurality of rollers and are arranged coaxially, Multiple axially extending portions are formed to connect the pair of annular ends in the axial direction and to fill the circumferential gaps between adjacent rollers in the circumferential direction, A radial roller bearing according to any one of claims 1 to 4, characterized by comprising the following:

Description

Radial roller bearing This invention relates to radial roller bearings. Generally, radial roller bearings are used in various mechanical devices such as the gear support and shaft support sections of automobile transmissions. Conventional radial roller bearings are known to be equipped with cages to prevent rollers from becoming loose and falling out before assembly, or to maintain the rollers at predetermined intervals in the circumferential direction. The cages for radial roller bearings described in Patent Documents 1 and 2 each have claws on the column portion and the annular portion of the cage for holding the rollers, thereby preventing the rollers from falling out radially outward and radially inward from the cage. Furthermore, Patent Document 3 discloses a cylindrical roller fall prevention device for preventing rollers from falling radially inward from the cage during transportation, etc. In the technology disclosed in Patent Document 3, after the rollers are assembled into a cage that does not have means to prevent them from falling radially inward, the roller fall prevention device is placed radially inward on a plurality of rollers arranged circumferentially. As a result, the rollers are supported radially outward by the cage and radially inward by the roller fall prevention device, preventing them from falling out of the cage. Figure 1 is a perspective view of a radial roller bearing according to the first embodiment.Figures 2(a) and 2(b) are cross-sectional views perpendicular to the circumferential direction of the radial roller bearing according to the first embodiment. Figure 2(a) shows the radial roller bearing alone according to the first embodiment, and Figure 2(b) shows the radial roller bearing according to the first embodiment incorporated into a rotating machine.Figure 3 is a plan view of the radial roller bearing according to the first embodiment, viewed from the radial direction.Figure 4 is a cross-sectional view taken from the direction of the line A-A in Figure 3.Figures 5(a) and 5(b) are cross-sectional views perpendicular to the circumferential direction of a modified radial roller bearing according to the first embodiment. Figure 5(a) shows the radial roller bearing according to the modified first embodiment in its standalone state, and Figure 5(b) shows the radial roller bearing according to the modified first embodiment incorporated into a rotating machine.Figure 6 is a perspective view of a radial roller bearing according to the second embodiment.Figures 7(a) and 7(b) are cross-sectional views perpendicular to the circumferential direction of the radial roller bearing according to the second embodiment. Figure 7(a) shows the radial roller bearing alone according to the second embodiment, and Figure 7(b) shows the radial roller bearing according to the second embodiment incorporated into a rotating machine.Figures 8(a) and 8(b) are cross-sectional views perpendicular to the circumferential direction of a modified radial roller bearing according to the second embodiment. Figure 8(a) shows the radial roller bearing according to the modified second embodiment in its standalone state, and Figure 8(b) shows the radial roller bearing according to the modified second embodiment incorporated into a rotating machine. (First Embodiment) Embodiments of the present invention will be described below with reference to the attached drawings. Figure 1 is a perspective view of a radial roller bearing according to the first embodiment. Figures 2(a) and 2(b) are cross-sectional views of the radial roller bearing according to the first embodiment perpendicular to the circumferential direction, where Figure 2(a) shows the radial roller bearing according to the first embodiment in a standalone state, and Figure 2(b) shows the radial roller bearing according to the first embodiment incorporated into a rotating machine. Figure 3 is a plan view of the radial roller bearing according to the first embodiment viewed from the radial direction. Figure 4 is a cross-sectional view taken in the direction of the A-A arrow in Figure 3. As shown in Figures 1, 2(a) and (b), the radial roller bearing 10 comprises a plurality of rollers 100 arranged circumferentially, and a molten retaining material 20 that holds the plurality of rollers 100 in the state before use. During use, the molten retaining material 20 melts due to lubricants such as grease and oil supplied to the radial roller bearing 10, frictional heat generated by the rotation of the radial roller bearing 10, and external heating. Note that the molten retaining material 20 shown in Figures 1 to 4, and in Figures 5(a) and (b) to 8(a) and (b) described later, represents the state before melting. In this embodiment, the radial roller bearing 10 does not have raceways such as an outer ring or inner ring. That is, the multiple rollers 100 roll between the inner circumferential surface of the housing 200 and the outer circumferential surface of the shaft 30