Cage for bearing and bearing using the same

Details Cage for bearing and bearing using the same Cage for bearing and bearing using the same

1999-09-22

2001-03-27

Hannon, Thomas R. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

C384S470000, C384S528000, C384S573000

Reexamination Certificate

active

06206575

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cage for bearing used in a bearing such as a swivel seat bearing, and in more detailed to a cage for bearing, which is formed by connecting plural plate-like members in a cylindrical shape, and a bearing using the same.
2. Description of the Related Art
A swivel seat bearing, includes members called separators that are interposed between respective balls in order to prevent the balls adjoining in circumferential direction from directly contacting each other, without using the cage. This type of bearing is difficult to be assembled and, further, the separators interfere with the rotation of the balls, so that a rotational torque becomes large.
Contrary to this, the swivel seat bearing of a type in which a usual cylindrical cage used in radial ball bearing is utilized is easy to be assembled and its rotational torque is reduced as well.
However, if a diameter of the swivel seat bearing becomes large, for the conventional cylindrical cage, its wall thickness becomes very thin and it becomes flexible owing to its insufficient rigidity, so that its roundness becomes extremely low and thus it cannot be used.
Further, there is known a cage formed into an approximately cylindrical shape by continuously arranging plural plate-like pieces in a circumferential direction. It is necessary that each of the plate-like pieces constituting this cage has a shape warped like a bow when viewed from the side. This warped shape is obtained by a direct replica from metal die molding the plate-like member. In this case, in order to prevent an unnecessary distortion deformation after the molding, the plate-like member is adapted such that the distortion deformation after the molding does not occur as far as possible by using a hard material or mixing reinforcing fibers as the plate-like member.
For the cage consisting of such plate-like members, since it is necessary to mold the plate-like member into a special shape worked into the bow shape by the metal die, costs for designing and manufacturing the metal die become high, so that a manufacturing cost of the cage becomes high.
Moreover, in case of the cage consisting of the plate-like members, in order to change its diametric dimension in large or small size, it is necessary to prepare a plurality of molding metal dies for its exclusive use, since it is necessary to change a warp degree of the plate-like member. Thus, equipment cost is greatly increased.
SUMMARY OF THE INVENTION
Therefore, a main object of the invention is to provide the cage for bearing, which has a structure capable of being manufactured at a low cost.
Another object of the invention is to provide the cage for bearing, wherein the cost for designing and manufacturing the metal die is low and the cost for manufacturing the cage is low as well.
Further another object of the invention is to provide the cage wherein, when it is necessary to change the warp degree, a low cost metal die suffices and the equipment cost can be reduced.
Still another object of the invention is to provide the bearing which is easily assembled using the foregoing cage for bearing and whose rotational torque is reduced.
Other objects, characteristics and advantages of the invention will become clear from the following description.
The cage for bearing of the invention is basically composed of the plural plate-like members each molded from a synthetic resin material by the metal die in a shape having pockets for retaining rolling elements, a shape obtained by mutually connecting each of the plural plate-like members at both end portions in a substantially cylinder shape, and a section between the both end portions of the each plate-like member has a convex warped shape constituting a part of the cylinder by being subjected to a distortion action owing to heat contraction after being molded by the metal die.
Preferably, the plate-like member is provided on its surface at a side becoming the convex shape with recesses for warping it in the convex shape constituting a part of the cylinder by being subjected to the distortion action.
Preferably, the recesses are provided in several places at a desired interval in a circumferential direction of the plate-like member.
Preferably, the recesses are elongated grooves along an axial direction.
Preferably, the plate-like member is formed with the elongated grooves at a side of the pocket.


REFERENCES:
patent: 4239304 (1980-12-01), Wakunami
patent: 4588313 (1986-05-01), Knappe et al.
patent: 4844628 (1989-07-01), Knappe
patent: 4865473 (1989-09-01), DeVito
patent: 5743659 (1998-04-01), Stewart
patent: 5749661 (1998-05-01), Moller
patent: B2 5-22086 (1993-03-01), None
patent: 9-88968 (1997-03-01), None

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