Koyo Seiko Company, Ltd.

Yasuhiro Miyata

Tomohiro Ishii

Nobuyuki Seo

Teruyuki Kawatani

Nobuyoshi Murakami

A fastening structure capable of preventing deterioration in the flatness of a surface of a flange portion () when a serration () of a bolt () is press-fit into the flange portion (). In this fastening structure, one portion in an axial direction of an outer peripheral surface () of the bolt () is provided with the serration (). The bolt () is press-fit into a bolthole () formed through the flange portion () of a mounting member (). The serration () is located apart from respective end surfaces (A) and (B) of the flange portion () by first and second distances (D, C), and the first and second distances (D, C) each exceed 13% of the thickness (A) of the flange portion (). With this arrangement, the serration () presses a bolthole inner peripheral surface () only in the region located far apart from both of the end surfaces (A andB) of the flange portion ().

Fastening structure including a bolt having a serration that is press-fit into a bolthole of a flange

A fastening structure capable of preventing deterioration in the flatness of a surface of a flange portion ( ) when a serration ( ) of a bolt ( ) is press-fit into the flange portion ( ). In this fastening structure, one portion in an axial direction of an outer peripheral surface ( ) of the bolt ( ) is provided with the serration ( ). The bolt ( ) is press-fit into a bolthole ( ) formed through the flange portion ( ) of a mounting member ( ). The serration ( ) is located apart from respective end surfaces ( A) and ( B) of the flange portion ( ) by first and second distances (D, C), and the first and second distances (D, C) each exceed 13% of the thickness (A) of the flange portion ( ). With this arrangement, the serration ( ) presses a bolthole inner peripheral surface ( ) only in the region located far apart from both of the end surfaces ( A and B) of the flange portion ( ).

A fastening structure capable of preventing deterioration in the flatness of a surface of a flange portion (,) when a serration (,) of a bolt (,) is press-fit into the flange portion (,). In this fastening structure, one portion in an axial direction of an outer peripheral surface (,) of the bolt (,) is provided with the serration (,). The bolt (,) is press-fit into a bolthole (,) formed through the flange portion (,) of a mounting member (,). The serration (,) is located apart from respective end surfaces (,A),,B) of the flange portion (,) by first and second distances (D, C), and the first and second distances (D, C) each exceed 13% of the thickness (A) of the flange portion (,). With this arrangement, the serration (,) presses a bolthole inner peripheral surface (,) only in the region located far from both end surfaces (,A and,B) of the flange portion (,).

Fastening structure including a bolt having a serration that is press-fit into a bolt hole of a flange

In a double-row rolling bearing, there is a uniform relationship between a pre-load applied to the bearing and a pre-load gap formed by elastic transformation of rollers and some parts related to the rollers. Therefore, to measure the pre-load is equivalent to measure the pre-load gap. Then, a pre-load gap is measured at every row of the rollers, and measured values of the pre-load gaps are added together to thereby obtain an entire pre-load gap of the bearing.

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Yamatokooriyama, Japan

Yasuhiro Miyata