JPH0557434U - Bearing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bearing device capable of positioning a bearing with respect to a bearing holder and reducing misalignment of the bearing. [Structure] A bearing holder 1 having a cylindrical body 1b having a hole 1a formed along the axial direction, a pair of upper and lower bearings 2 and 3 which are separately press-fitted into the hole 1a of the bearing holder 1 from above and below, and The collar 4 is located between the pair of bearings 2 and 3 and is press-fitted into the hole 1 a of the bearing holder 1.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a bearing device used for bearings such as motors.

[0002]

[Prior Art]

 Conventionally, for example, in a bearing device of a spindle motor for an optical disk, a bearing holder having a cylindrical body having a hole formed along the axial direction and press-fitting vertically into the hole of the bearing holder. Some have a pair of upper and lower bearings.

The pair of upper and lower bearings are press-fitted into the holes of the bearing holder by a mandrel, but the inner diameter accuracy is improved by using a mandrel having a diameter larger than the inner diameter of the bearing.

[0004]

[Problems to be solved by the device]

 By the way, in the bearing device configured as described above, there is a possibility that the bearing may move when the mandrel is pulled out, resulting in displacement.

[0005]

[The purpose of the device]

 The present invention has been made in view of the above circumstances, and an object thereof is to provide a bearing device capable of positioning a bearing with respect to a bearing holder and reducing misalignment of the bearing.

[0006]

[Means for Solving the Problems]

 In order to achieve the object, the present invention provides a bearing holder having a cylindrical body having a hole along the axial direction, and a pair of upper and lower bearings that are separately press-fitted into the hole of the bearing holder from above and below. And a collar which is located between the pair of upper and lower bearings and is press-fitted into the hole portion of the bearing holder.

[0007]

[Action]

 In such a configuration, a pair of upper and lower bearings are separately press-fitted in the hole formed along the axial direction of the cylindrical body from the vertical direction of the bearing holder. At this time, since the collar is press-fitted into the hole of the bearing holder located between the pair of upper and lower bearings, the bearing can be easily positioned with respect to the bearing holder.

[0008]

【Example】

 Next, an embodiment of the bearing device of the present invention will be described with reference to FIGS.

FIG. 1 is an exploded perspective view of an essential part showing a bearing device of the present invention, FIG. 2 is an enlarged perspective view of a collar showing an example of a collar, and FIGS. 3A and 3B show another example of a collar. It is an enlarged perspective view of a color.

In FIG. 1, A is a bearing device used in, for example, a spindle motor for an optical disk, and this bearing device A has a bearing holder 1 having a cylindrical body 1b having a hole 1a formed along the axial direction. And a pair of upper and lower bearings 2 and 3 which are separately press-fitted into the hole 1a of the bearing holder 1 from the vertical direction, and the hole 1a of the bearing holder 1 is located between the pair of upper and lower bearings 2 and 3. And a press-fitted collar 4.

The collar 4 is made of a material that has compressive strength and does not dissolve in bearing oil, and is made of, for example, iron / copper / aluminum-based metal or plastic such as PC / PPS / POM. As shown in FIG. 2, a sleeve 4a is formed at the end of the collar 4, and the sleeve 4a forms a gap between the bearings 2 and 3 and the collar 4 to supply the bearings 2 and 3. Since the bearing holder 1 can be provided with an excessive amount of oil to be generated, abnormal noise due to oil shortage is eliminated.

The oil reservoir sleeve 4a formed on the collar 4 has a plurality of radial slits 4b, 4b, ... Formed on both edges of the collar 4, as shown in FIG. 3 (A), for example. 2 or a plurality of slits 4c, 4c ... Formed on the outer surface of the collar 4 along the axis of the collar 4, as shown in FIG. 4 (B). Not something.

In order to assemble the bearings 2 and 3 into the bearing holder 1 in the above configuration, first, the collar 4 is press-fitted into the hole 1a formed in the cylindrical body 1b of the bearing holder 1, and then the upper and lower bearings 2 , 3 are press-fitted and fixed by a mandrel (not shown). At this time, since the press-fitting depth of the bearings 2 and 3 into the hole 1a of the bearing holder 1 is determined by the height of the collar 4, even if the positioning of the bearings 2 and 3 is deviated when the mandrel is pulled out, it is easy to obtain the normal position. It is possible to correct the position.

[0014]

[Effect of the device]

 As described above, in the bearing device of the present invention, the bearing holder having the cylindrical body in which the hole along the axial direction is formed and the hole of the bearing holder are separately press-fitted from the vertical direction. By providing a pair of upper and lower bearings and a collar that is located between the pair of upper and lower bearings and press-fitted into the hole of the bearing holder, the bearing can be positioned with respect to the bearing holder. It is possible to reduce the misalignment defect of the.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing a bearing device of the present invention.

FIG. 2 is an enlarged perspective view of a collar showing an example of the collar.

3A and 3B are enlarged perspective views of a collar showing another example of the collar.

[Explanation of symbols]

 A Bearing device 1 Bearing holder 1a Hole 1b Cylindrical body 2 Bearing (upper) 3 Bearing (lower) 4 Color

Claims (1)

[Scope of utility model registration request] 1. A bearing holder having a cylindrical body in which a hole along the axial direction is formed, a pair of upper and lower bearings separately press-fitted into the hole of the bearing holder from above and below, and the pair of upper and lower bearings. And a collar which is located between the two and is press-fitted into the hole portion of the bearing holder.