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US 7,547,144 B2Granted
Crossed roller bearing
AssigneeNippon Thompson Co., Ltd.
InventorsKazumasa Kunimoto, Naoki Koshino
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AssigneeNippon Thompson Co., Ltd.
InventorsKazumasa Kunimoto, Naoki Koshino
Estimating the term…
The thickness of a crossed roller bearing is reduced and attachment of a lid member 17 to a loading hole 16 from which rollers 15 are loaded is facilitated. Raceway grooves 13, 14 are respectively formed in an inner ring 11 and an outer ring 12. The rollers are loaded from the loading hole formed in the outer ring, and interposed between the raceway grooves. The axes of the adjacent rollers lie at right angles to each other. The loading hole is covered by the lid member. A flange 22 is provided on an outer periphery of the outer ring, and has an outer end face 22a that is approximately flush with an end face of the outer ring and an inner end face 22b that is either in a position in alignment with or in an inner position across outer ends of the raceway grooves in an axial direction.
A crossed roller bearing, which has raceway grooves respectively formed in an inner ring and an outer ring, includes rollers loaded from a loading hole formed in the outer ring, and interposed between the raceway grooves, in which the axes of the adjacent rollers lie at right angles to each other, and has a lid member covering the loading hole, comprising
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
With cylindrical rollers: the rollers being crossed within the single row
Assembling rolling-contact bearings: placing rolling bodies in cages or bearings
Shafts
About 9 months of term left · ends 25 Jul 2027 (estimated)
1. Field of the Invention
This invention relates to a crossed roller bearing having rollers interposed between an outer ring and an inner ring and a flange formed around the outer ring.
2. Description of the Related Art
FIG. 1 is a sectional view illustrating a crossed roller bearing after assembly according to the present invention.
FIG. 2 is a plan view of an outer ring.
FIG. 3 is a sectional view of the outer ring with a lid member attached thereto.
FIGS. 1 to 4 illustrate an embodiment according to the present invention, in which an outer ring 12 is provided on the outside of an inner ring 11. Raceway grooves 13 and 14 are formed in the respective inner and outer rings 11 and 12. As is seen from FIGS. 1 to 3, each of the raceway grooves 13 and 14 has a V-shaped bottom face having a square corner. When the raceway grooves 13 and 14 face each other, rollers 15 each having a square sectional profile are arranged between the raceway grooves 13 and 13.
A loading hole 16 is formed in the outer ring 12 and extends from the outer periphery of the outer ring 12 to the raceway groove 14. The loading hole 16 is a round hole and has a diameter approximately equal to the length of a diagonal line of the square shape which is the sectional profile of each roller 15, so that each of the rollers 15 can be tilted and enter from the loading hole 16. The rollers 15 are inserted into between the raceway grooves 13 and 14 from the loading hole 16, in such a way that the rollers 15 adjacent to each other have the axes orthogonal to each other, whereby the crossed roller bearing can simultaneously receive a moment load, a load in an axial direction and a load in a radial direction as in the conventional case.
A required diameter of the loading hole 16 is more than the length of the diagonal line of the roller 15. However, the smallest possible diameter of the loading hole 16 is advantageous in order to ensure the rigidity of the crossed roller bearing. Form this viewpoint, instead of more than the length of the diagonal line of the roller 15 as in the embodiment, the diameter of the loading hole 16 may be set at a length between the diameter and the diagonal line of the roller 15. In the case of a smaller diameter of the loading hole 16 than the diameter used in the embodiment, each of the rollers 15 is inserted into the loading hole 16 after the axis of the roller 15 is kept parallel to the axis of the loading hole 16. Then, the roller 15 is tilted in the raceway grooves 13 and 14.