초록 ▼

A sealed shaft bearing assembly employs a lubricant seal having a rigid seal case supporting a resilient dust seal in rubbing contact with a cylindrical surface on the shaft, and a labyrinth type primary seal between the dust seal and the interior of the seal case, with the labyrinth being defined b

A sealed shaft bearing assembly employs a lubricant seal having a rigid seal case supporting a resilient dust seal in rubbing contact with a cylindrical surface on the shaft, and a labyrinth type primary seal between the dust seal and the interior of the seal case, with the labyrinth being defined by a stator mounted on the seal case and a rotor mounted for rotation with the shaft, and with the stator including a cylindrical tubular portion defining an elongated thin annular gap with the shaft cylindrical surface and the rotor defining an elongated thin annular gap with the outer surface of the rotor. The radial thickness and axial lengths of the thin annular gaps are such as to preclude the passage of grease type lubricant therethrough upon operation of the bearing.

대표청구항 ▼

[ What is claimed is:] [1.] In a sealed bearing assembly including a bearing housing have at least one outer bearing race therein and a cylindrical bore extending into each end thereof outboard of and coaxial with the outer race, a shaft having a cylindrical surface thereon, bearing cone means mount

[ What is claimed is:] [1.] In a sealed bearing assembly including a bearing housing have at least one outer bearing race therein and a cylindrical bore extending into each end thereof outboard of and coaxial with the outer race, a shaft having a cylindrical surface thereon, bearing cone means mounted on the shaft cylindrical surface for rotation therewith, an inner race on the bearing cone means spaced generally radially inwardly from each said at least one outer race, friction bearing means between the inner and outer races, and a lubricant seal assembly at each end of the bearing assembly cooperating with the bearing housing and the shaft cylindrical surface defining an enclosure retaining a grease type lubricant in the bearing assembly, each said seal assembly comprising,a cup-shaped seal case having a generally cylindrical body with an open end mounted in one of said cylindrical bores and an end wall spaced outwardly of said housing from the open end, the end wall having an opening therein coaxial with and spaced from said shaft cylindrical surface,a resilient ring-shaped dust seal mounted on said seal case end wall, said dust seal including a resilient sealing lip dimensioned to provide light rubbing contact with said shaft cylindrical surface,and a labyrinth type primary grease seal between said dust seal and a grease type lubricant within said enclosure, the labyrinth seal including a rotor and a stator mounted within said seal case and each including an elongated tubular body portion having an open end,said stator tubular body portion having a cylindrical inner surface extending coaxially with and in closely spaced relation to said shaft cylindrical surface to define a first thin, axially extending annular gap and having a second end opposite its open end, said second end being fixedly mounted in fluid-tight relationship on said seal case,said rotor tubular body portion having a cylindrical inner surface telescopingly received over said stator tubular body portion to define a second thin, axially extending annular gap and having a second end opposite its open end, said second end being mounted in fixed fluid-tight relationship with said inner race for rotation therewith, said first and second annular gaps being in fluid communication with one another at the open end of said stator tubular body and said second annular gap being in fluid communication with the interior of said seal case at the open end of said rotor tubular body,the radial thickness and axial length of said first and second gaps being dimensional to preclude the flow of semi-solid grease lubricant therethrough to the dust seal while permitting sufficient oil to migrate therethrough to lubricate said dust seal lip.