Abstract: A bearing roller chain which is sealed by a seal mechanism which prevents entry of foreign substances from the outside and leakage of lubricating oil leakage from the inside to the outside, resulting in an improvement in wear resistance of the bearing roller and avoidance both of rotation failure of the roller and of increased traveling resistance of the chain. A seal mechanism is provided between an inner link plate of a bearing roller chain and a bearing roller assembly carried by the link plate. The bearing roller assembly is formed by a plurality of anti-friction rollers between a hollow roller and a bush. The seal mechanism comprises an inner annular oil seal member, a spacer and a disk-shaped seal member having a flange extended toward an outer side surface of the hollow roller loosely into an outer circumferential concave groove on an end surface of the hollow roller. The disk-shaped seal member slidably comes into close contact with the inner link plate and the spacer, respectively.

Abstract: A bearing roller chain which is sealed by a seal mechanism which prevents entry of foreign substances from the outside and leakage of lubricating oil leakage from the inside to the outside, resulting in an improvement in wear resistance of the bearing roller and avoidance both of rotation failure of the roller and of increased traveling resistance of the chain. A seal mechanism is provided between an inner link plate of a bearing roller chain and a bearing roller assembly carried by the link plate. The bearing roller assembly is formed by a plurality of anti-friction rollers between a hollow roller and a bush. The seal mechanism comprises an inner annular oil seal member, a spacer and a disk-shaped seal member having a flange extended toward an outer side surface of the hollow roller loosely into an outer circumferential concave groove on an end surface of the hollow roller. The disk-shaped seal member slidably comes into close contact with the inner link plate and the spacer, respectively.

Abstract: A bearing roller chain having a seal mechanism preventing entry of foreign substance from the outside, and leaking of lubricating oil leakage to the outside and the like, thereby improving wear resistance of the bearing roller and reducing both the likelihood of rotation failure and the traveling resistance of the chain. The seal mechanism is provided between an inner link plate of the chain and the hollow bearing roller, which has a plurality of internal anti-friction rollers rotatable between the hollow bearing roller and a bush mounted between opposed inner link plates. The seal mechanism encloses the internal anti-friction rollers and comprises two parts, i.e a seal ring having an annular lip portion, which comes into close contact with an outer side surface of the bearing roller and an annular metallic seal member.