Single-split cage

Patent metadata

Field	Value
Publication number	US-9004775-B2
Application number	US-201113392761-A
Country	US
Kind code	B2
Filing date	Sep 13, 2011
Priority date	Sep 14, 2010
Publication date	Apr 14, 2015
Grant date	Apr 14, 2015

Abstract

The present invention provides a single-split cage capable of continuously holding a plurality of rolling elements stably for a long time by eliminating the difference in the strength between split regions, by maintaining the strength of the entire cage uniform in the circumferential direction and by maintaining the dimensional accuracy between the split regions constant at the time of molding and also capable of improving load capacity and achieving low cost for assembly. A split section 10 for splitting at one portion in the circumferential direction is formed at regions (split regions 10 a and 10 b ) extending between pockets 2 p adjacent to each other in the circumferential direction, engagement sections being engageable with each other are provided at the circumferential central position between the pockets and on a one-side split face Sa and the other-side split face Sb formed by splitting the regions, and in a state in which both the engagement sections are engaged with each other, predetermined clearances are formed between the one-side split face and the other-side split face and between the engagement sections.

First claim

The invention claimed is:

1. A single-split cage comprising:
a pair of circular ring sections having a circular ring shape and being disposed so as to be opposed to each other;
a plurality of pillar sections continuously extending between the circular ring sections and arranged at predetermined intervals in the circumferential direction; and
a plurality of pockets formed in the portions enclosed by the pair of circular ring sections and the plurality of pillar sections and at predetermined intervals in a circumferential direction, wherein:
in the single-split cage, a split section for splitting the cage at one portion in the circumferential direction thereof in a direction being crosswise to the circumferential direction is provided;
the split section is formed at regions extending between the pockets adjacent to each other in the circumferential direction, and at the circumferential center position between these pockets, a one-side split face and an other-side split face formed by splitting the regions are disposed so as to be opposed in the circumferential direction;
engagement sections being mutually engageable are respectively provided on the one-side split face and the other-side split face, and these engagement sections are disposed so as to be opposed to each other in the circumferential direction;
on the one-side split face, as the engagement sections, a plurality of one-side convex sections protruding toward the other-side split face and a one-side concave section formed by denting the area between these one-side convex sections are provided;
on the other-side split face, as the engagement sections, a plurality of other-side concave sections with which the plurality of one-side convex sections are engageable and an other-side convex section protruding toward the one-side split face between the other-side concave sections and engageable with the one-side concave section are provided;
when the thickness between the one-side split face, other than the engagement sections, and the pockets on both sides is W 1 , and when the thickness between the other-side split face, other than the engagement sections, and the pockets on both sides is W 2 , the relationship of:
W1=W2

is satisfied; and
in a state in which both the engagement sections of both the one-side split face and the other-side split face are engaged with each other, the relationship of:
A>B=C,

is satisfied,
wherein the clearance formed between the one-side split face, other than the engagement sections, and the other-side split face, other than the engagement sections, in the circumferential direction is A;
the clearance formed between the one-side convex section of the engagement sections of the one-side split face and the other-side concave section of the engagement sections of the other-side split face in the circumferential direction is B; and
the clearance formed between the one-side concave section of the engagement sections of the one-side split face and the other-side convex section of the engagement sections of the other-side split face in the circumferential direction is C.

2. The single-split cage according to claim 1 , wherein:
the one-side convex section, the one-side concave section, the other-side concave section and the other-side convex section respectively have a rectangular geometry:
the axial inner face of the one-side convex section constitutes the axial side face of the one-side concave section:
the axial inner face of the other-side concave section constitutes the axial side face of the other-side convex section, and these are formed so as to be in parallel with each other in the circumferential direction:
in a state in which both the engagement sections of the one-side split face and the other-side split face are engaged with each other, the clearances between the engagement sections in the direction perpendicular to the circumferential direction are set so as to satisfy the relationship of:
D>E,

wherein the clearance formed between the one-side convex section and the other-side concave section is D; and
the clearance formed between the one-side concave section and the other-side convex section is E.

3. The single-split cage according to claim 2 , wherein:
on the one-side split face, diameter-increase restricting concave sections are formed on the axial outsides of the plurality of one-side convex sections;
on the other-side split face, diameter-increase restricting convex sections capable of being engaged with the diameter-increase restricting concave sections are formed on the axial outsides of the plurality of the other-side concave section; and
the axial side faces of the diameter-increase restricting concave section and the diameter-increase restricting convex section, opposed to each other, are formed into a tapered shape so as to make contact with each other when the split section is expanded in the circumferential direction.

4. The single-split cage according to claim 3 , wherein:
the clearance between the diameter-increase restricting concave section and the diameter-increase restricting convex section, formed in a direction perpendicular to the circumferential direction, is larger than the clearance between the one-side concave section and the other-side convex section, formed in a direction perpendicular to the circumferential direction.

Assignees

• Ishibashi Yutaka
• Nsk Ltd

Inventors

• Ishibashi Yutaka

Classifications

• F16C19/463

  consisting of needle rollers held in a cage, i.e. subunit without race rings · CPC title

• F16C2226/70

  with complementary interlocking parts · CPC title

• F16C33/4694 Primary

  Single-split roller or needle cages · CPC title

• F16C33/4635

  made from plastic, e.g. injection moulded window cages · CPC title