Ntn Corporation

Atsushi Yamashita

Kazuyoshi Harimoto

Eiji Ohsugi

Tsutomu Hashimoto

Kiyoshi Kaneko

Keiji Suzuki

Izumi Ohashi

Taichiro Furukawa

Seiji Kanbori

Kohhei Kondoh

A retainer and method of manufacturing the same which makes it possible to form roller stopper lugs reliably on broken surfaces on the side faces of the crossbars formed by punching and also guide surfaces which can guide rollers with high accuracy. A plurality of protrusions are formed on both sides of the crossbars. The surfaces of the protrusions are ironed in both thickness directions to form roller stopper lugs at both ends of the protrusions. The flat surfaces formed on the protrusions by ironing serve as the roller guide surfaces. Thus, the rising and sinking amount of the rollers can be controlled with high accuracy.

Retainer for roller bearing and method for manufacturing the same

A cage for a roller bearing which is free of fretting and abnormal noise, which can be manufactured at low cost, and which can be easily mounted in the bearing. The cage is formed by bending a metal sheet having pockets into a ring shape, temporarily joining its ends, heat-treating the ring thus formed to remove stress, and separating the temporarily joined portion. Such a cage tends to rotate slower than the raceway members on the driving side of the bearing, making it possible to reduce fretting. Such a cage can be used under high-temperature conditions.

Cage for roller bearings and method for manufacturing the same

A retainer for a needle roller bearing which can prevent a film of lubricating oil from being broken due to its needle roller retaining claws and thus prevent peeling of the needle rollers. Outer-diameter claws and inner-diameter claws are provided on roller guiding surfaces on both sides of each crossbar portion of the retainer to retain the needle rollers in pockets defined between the adjacent crossbars. In the case of an outer-diameter guide type retainer, the outer-diameter claws are provided at a stepped portion formed on the outer-diameter surface of each crossbar. In the case of an inner-diameter guide type retainer, the inner-diameter claws are provided at a stepped portion formed on the inner-diameter surface of each crossbar.

Retainer for needle roller bearing

Cage for roller bearings

A needle roller bearing is directed to avoid a possibility that an inner peripheral surface of a bore in a housing may be ground or scraped by an edge defining a peripheral lip region of an opening in an outer race when a needle roller bearing is to be press-fitted into the bore in the housing and also to eliminate the need to adjust the position of a roller retainer while increasing a physical strength of the roller retainer. For this purpose, the outer race is formed with a first opening having a pair of axially spaced tabs bent so as to incline radially inwardly of the outer race from the remaining portion of the outer race. The roller retainer is in the form of a tubular member having a circumferentially continuous wall formed with a second opening at a location aligned with the first opening in the outer race. The roller retainer has a substantially intermediate portion protruding radially outwardly so as to have an outer diameter greater than that of any one of the opposite ends of the roller retainer.

Needle roller bearing

Growing community of inventors

Fukuroi, Japan

Atsushi Yamashita