US 4,792,245 A · Bearing device

Abstract

A bearing device for rotatably supporting the end of a rotational shaft through a slide bearing to a base comprising a through opening perforated at a part of the base for press-fitting the slide bearing, and a retainer containing opening formed at the base to substantially perpendicularly cross the through opening, and a retainer disposed in the retainer containing opening of the base for bearing the axial force of the rotational shaft, thereby reducing the manufacturing cost and improving its accuracy.

Drawings

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Drawings

Claims4

Dependent claims

In a bearing device for rotationally supporting a shaft rotatable about a shaft axis, said shaft having a first end, a second end opposite said first end, and a given outer diameter, said bearing device including first bearing means supporting said first end of said shaft and second bearing means supporting said second end of said shaft,

the improvement comprising:
a base at said first end of said shaft having a through hole extending through said base from a first opening on an outer first side of said base to a second opening on an inner second side of said base in an axial direction along said shaft axis, and a retainer opening formed in a transverse direction perpendicular to said axial direction such that said retainer opening intersects said through hole in said base at a position near to said outer first side of said base;
said shaft having said first end formed with an axial bearing surface in said axial direction at said first end;
said first bearing means formed as a slide bearing press fitted into said through hole in said base and having an inner diameter fitting said outer diameter of said shaft and aligned with said second bearing means in coaxial alignment, so as to allow rotation of said shaft supported in said slide bearing and said second bearing means;
said slide bearing extending from said inner second side of said base through said through hole to the position of said transverse retainer opening;
means in conjunction with said second bearing means for providing an axial compression force on said shaft at said second end thereof;
and
a retaining member inserted into said retainer opening in said base, said retaining member and said retainer opening having corresponding shapes such that said retaining member is seated in said retainer opening and positioned across said through hole wherein said axial bearing surface at said first end of said shaft is pressed into bearing contact with said retaining member by said axial compression force,
whereby during assembly said slide bearing is press fitted into said through hole in said base and a final sizing operation of the inner diameter of said slide bearing can be performed through said first opening on said outer first side of said through hole to properly size and align said slide bearing with said second bearing means for precise coaxial support of said shaft.

6 more elements

A method of forming a bearing device for rotationally supporting a shaft rotatable about a shaft axis, said shaft having a first end, a second end opposite said first end, and a given outer diameter, said bearing device including first end, and a means supporting said first end of said shaft and second bearing means supporting said second end of said shaft,

the improved method comprising:
providing a base at said first end of said shaft having a through hole extending through said base from a first opening on an outer first side of said base to a second opening on an inner second side of said base in an axial direction along said shaft axis, and a retainer opening formed in a transverse direction perpendicular to said axial direction such that said retainer opening intersects said through hold in said base at a position near to said first side of said base;
forming said shaft with an axial bearing surface in said axial direction at said first end;
forming said first bearing means by press fitting a slide bearing into said though hole in said base, said slide bearing having an inner diameter fitting said outer diameter of said shaft and aligned with said second bearing means in coaxial alignment and having a length in said axial direction extending from said second side of said base through said through hole to the position of said transverse retainer opening;;
performing a final sizing operation of said inner diameter of said slide bearing, after said slide bearing has been press fitted into said through hole, by inserting a cutting tool through said first opening on said outer first side of said base, so as to precisely size and coaxial align said slide bearing with said second bearing means for precise rotational support of said shaft;
assembling said shaft to said second bearing means including providing an axial compression force on said shaft at said second end;
and
inserting a retaining member into said retainer opening in said base to position said retaining member across said through hole wherein the axial bearing surface at said first end of said shaft is pressed by said axial compression force into bearing contact with said retaining member.

5 more elements

Dependencies are inferred from the claim text.

Description1,442 words

Summary629 words

#1. FIELD OF THE INVENTION

#This invention relates to a bearing device adapted to be used for an electronic equipment such as a magnetic disk device.

#2. DESCRIPTION OF THE PRIOR ART

Brief description of the drawings5 figures

#FIG. 1 is an explanatory view showing an embodiment of a bearing device according to the present invention;

#FIG. 2 is a plan view of the essential portion of the bearing device;

#FIG. 3 is an explanatory view showing another embodiment of a bearing device according to the present invention;

Detailed description733 words

#Embodiments of a bearing device according to the present invention will be described in detail with reference to the accompanying drawings.

#FIG. 1 is an explanatory view of an embodiment of a bearing device according to the present invention, and FIG. 2 is a plan view of the essential portion of the bearing device, wherein the same parts and components as those in FIG. 5 designate the same or equivalent parts and components, and the duplicated description will be omitted.

#In FIGS. 1 and 2, a base 1 made by aluminum die casting is formed with a through opening 15 perforated axially of a threaded shaft 3, and a small-diameter retainer containing opening 16 perforated to substantially perpendicularly cross the opening 15 to construct a bearing device 14 to become the reference side bearing of the threaded shaft 3. A metal 7 and a needle pin 17 are press-fitted fixedly at predetermined positions in the through openings 15 and the retainer containing opening 16, respectively. The needle pin 17 is a known needle-like steel used for a needle bearing and the like having excellent hardness and area accuracy. This needle pin is used as a retainer in this embodiment. One end of the threaded shaft 3 is inserted through a ball 5 for holding a point contact with the needle pin 17 into the opening 15 of the base 1. Thus, the needle pin 17 is applied with the axial force of the threaded shaft 3, and the metal 7 is provided to radially position to construct the bearing device 14 of the ball 5, the metal 7 and the needle pin 17.

Facts

Application

07/101,128Filed 24 Sep 1987

Priority

JP 61-191671[U]15 Dec 1986

Granted

20 Dec 1988

Term ended

24 Sep 2007

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification14 codes

H02K 7/081
Structural association with bearings: specially adapted for worm gear drives
B23Q 5/404
By feed shaft, e.g. lead screw: screw bearings therefor
F16C 17/08
For axial load only: for supporting the end face of a shaft or other member, e.g. footstep bearings
F16C 2322/39
Apparatus used in shaping articles: general buildup of machine tools, e.g. spindles, slides, actuators

Description1,442 words

Summary629 words

#1. FIELD OF THE INVENTION

#This invention relates to a bearing device adapted to be used for an electronic equipment such as a magnetic disk device.

#2. DESCRIPTION OF THE PRIOR ART

Brief description of the drawings5 figures

#FIG. 1 is an explanatory view showing an embodiment of a bearing device according to the present invention;

#FIG. 2 is a plan view of the essential portion of the bearing device;

#FIG. 3 is an explanatory view showing another embodiment of a bearing device according to the present invention;

Detailed description733 words

#Embodiments of a bearing device according to the present invention will be described in detail with reference to the accompanying drawings.

Bearing device

Life of this patent

Bearing device

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims4

Description1,442 words

Drawings

Classification14 codes

Life of this patent

Description1,442 words