JP2000356219A - Pre-loaded bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device allowing positive and easy pre-load adjustment by spacers with no change of pre-load quantity without causing the inclination of outer rings when mounted to a housing. SOLUTION: Double rows of outer diameter grooves 3, 4 are directly formed at a distance on the outer periphery of a shaft 1. Inner diameter grooves 5a, 6a are formed in relation to the outer diameter grooves 3, 4 of the shaft 1, and outer rings 5, 6 are arranged at a distance on the outer periphery of the shaft 1. The requested number of rolling elements 8... are respectively built in raceway track grooves 7, 7 formed by the outer diameter grooves 3, 4 of the shaft 1 and the inner diameter grooves 5a, 6a of the outer rings 5, 6, and two spacers 10, 11 built in between the outer rings 5, 6 are pushed in to move in the mutually sliding state of opposed inclined faces 10a, 11a of the spacers 10, 11 to adjust pre-load in the separating direction of the outer rings 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device in which a preload is applied between two outer rings by a preload adjusting member in a direction in which the two outer rings are separated from each other.

[0002]

2. Description of the Related Art For example, a video tape recorder (VT)
R: Video Tape Recorder), capstan motor,
Examples of this type of bearing device used for an LBP (Laser Beam Printer) motor, a hard disk drive (Hard Disk Drive) motor, a hard disk drive (Hard Disk Drive) swing arm, and other motors are shown in FIGS. The configurations shown in FIGS. 9 and 10 are known.

[0003]

In the prior art shown in FIG. 7, two rows of raceway grooves 102, 102 formed separately on the outer circumference 101 of a shaft 100 are provided with outer races 300, 102 through rolling elements 200.
The preload is applied to the bearing portion by a coil spring 400 mounted with the spring 300 mounted between the outer races 300 and 300 via a spring seat. However, in such a conventional technique, it is difficult to mount the coil spring 400, and in particular, under the above-described usage, the component size is often small, and the assembling work is difficult.

[0004] Further, the prior art shown in FIG.
This bearing unit is mounted on a housing by using a material having a high elastic modulus and having a spring property by using a bearing device (Utility Model Registration No. 251577) for twisting the 501s to apply a preload. In some cases, the outer ring 300 may be tilted, and the amount of preload may change.

A bearing device shown in FIG.
49616) and the bearing device shown in FIG.
9717) is a single spacer 502 or 50 having a C-shaped cross section.
3 is inserted between the outer rings 300, 300.
Since the character-shaped spacer 502 (503) is inserted,
There is no worry about the inclination of 00 or the change in the preload amount. However, in these prior arts, it was necessary to adjust the dimensions of the spacers 502 (503) according to the slight work error of each bearing device, or to select and combine them.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art.
An object of the present invention is to provide a bearing device capable of reliably and easily performing preload adjustment by a spacer without causing inclination of an outer ring when a housing is mounted and without changing a preload amount.

[0007]

In order to achieve the above object, the present invention provides a technical means in which a plurality of rows of outer diameter grooves are formed directly at an outer periphery of a shaft, and an inner diameter groove is formed with respect to the outer diameter grooves. Are arranged separately from each other, and rolling elements are incorporated in raceway grooves formed by the outer diameter groove and the inner diameter groove, and the respective outer rings are separated between the separated outer rings. A preload adjusting member for applying a preload in the direction, the preload adjusting member is constituted by two spacers, the facing surfaces of the respective spacers are inclined surfaces, and the inclined surfaces slide with each other. To adjust the preload applied to both outer wheels.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The bearing device A comprises a shaft 1, two outer rings 5, 6 arranged on the shaft 1, rolling elements 8 arranged between the shaft 1 and the outer rings 5, 6, and two outer rings 5, Preload adjusting member 9 arranged between 6
And is constituted by. In the figure, 12 is a sealing plate, 13
Indicates a cage. The description of the sealing plate 12 and the retainer 13 is omitted in this specification, but the present invention is not particularly limited to the illustrated example, and other well-known forms can be appropriately selected and used.

The shaft 1 directly forms double-row outer diameter grooves 3 and 4 spaced apart from its outer periphery (outer diameter) 2, and the outer races 5 and 6 have an inner diameter with respect to the outer diameter grooves 3 and 4 of the shaft 1. Grooves 5a and 6a are formed and arranged separately from the shaft 1, and the rolling elements 8 are formed by the outer diameter grooves 3 and 4 of the shaft 1 and the inner diameter grooves 5a and 6a of the outer rings 5 and 6. A desired number is incorporated in each of the raceway grooves 7.

The shaft 1, the outer races 5, 6 and the rolling elements 8 are not particularly limited to the present embodiment, but can be changed to any known structure within the scope of the present invention.

The preload adjusting member 9 includes two spacers 10, 11
The preload applied to the two outer races 5, 6 that are spaced apart from each other is adjusted, that is, the preload is applied in the direction in which the respective outer races 5, 6 are separated from each other.

The spacers 10, 11 are inclined surfaces 10a, 11a, which are opposed to the spacers 5, 6, respectively. The inclined surfaces 10a, 11a can be pushed into each other so that the inclined surfaces 10a, 11a slide against each other. ) Or torsional rotational movement (torsional sliding) to apply a preload in the direction in which the outer rings 5, 6 that are spaced apart are separated. In addition, if the inclined surfaces 10a and 11a formed on the opposing surfaces are moved so as to slide with each other, the preload applied to the outer rings 5 and 6 is adjusted. The present embodiment is not limited to the inclination angles of 10a and 11a.

FIGS. 1 to 3 show a first embodiment. In the first embodiment, for example, the inner diameters 10b and 11b are formed in a substantially cylindrical shape having a diameter larger than the outer diameter 2 of the shaft 1. The slits 10c, 11c formed in the axial direction are substantially C-shaped in cross section, and the facing surfaces of the spacers 10, 11 are inclined surfaces 10a, 11a which can be in close contact with each other.
By pushing and pulling the outer rings 1a so as to slide each other, the outer rings 5, 6 which are spaced apart from each other are preloaded in a direction in which they are separated from each other.

That is, the inclined surfaces 10 of the spacers 10 and 11
By sliding the a and 11a together, the axial length formed by the spacers 10 and 11 increases and decreases, and the preload applied to the outer rings 5 and 6 is adjusted by the increase and decrease.

In the preload setting according to the embodiment shown in FIG. 1, the spacers 10 and 11 are gradually pushed while the bearing is vibrated, and the pushing is stopped when the resonance frequency due to the target preload rigidity is reached. After that, it is fixed by bonding.
In addition, you may hold | maintain only by friction. Also, during this setup,
By rotating the bearing slowly, the contact state between the rolling element 8 and the outer diameter groove and the inner diameter groove is stabilized, and the variation in the preload rigidity after setting can be reduced.

FIGS. 4 to 6 show a second embodiment. In the second embodiment, for example, the inner diameters 10b and 11b are formed in a substantially cylindrical shape having a diameter larger than the outer diameter 2 of the shaft 1. Inclined surfaces 10a, 1 capable of closely contacting opposing surfaces of the spacers 10, 11
1a, the inclined surfaces 10a and 11a are relatively twisted and rotationally moved (twisted sliding) so as to slide against each other, so that a preload is applied in a direction in which the two outer rings 5 and 6 arranged apart are separated from each other. And The direction of rotation is not particularly limited.

That is, the inclined surfaces 10 of the spacers 10 and 11
When the a and 11a are slid together and relatively twisted and rotated in either direction, the axial length formed by the spacers 10 and 11 increases and decreases, and the axial change is applied to the outer rings 5 and 6 by the increase and decrease. Preload is adjusted.

In the preload setting according to the embodiment shown in FIG. 4, the spacers 10 and 11 are gradually rotated while being vibrated while the bearing is being vibrated, and pushed when the resonance frequency due to the desired preload rigidity is reached. To stop. After that, it is fixed by bonding. In addition, you may hold | maintain only by friction. When assembling and cleaning bearings, do so without preload.

[0020]

According to the present invention, since the present invention has the above-described structure, the opposed inclined surfaces of the spacers are slid and moved.
Since the preload adjustment is performed by rotating the bearing, it is possible to provide a bearing device that can reliably and easily perform the preload adjustment by the spacer without causing the outer ring to tilt when the housing is mounted and without changing the preload amount. did it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view showing an embodiment of a spacer as a main part.

FIG. 3 is a cross-sectional plan view of a main part spacer.

FIG. 4 is a longitudinal sectional view showing another embodiment.

FIG. 5 is a side view showing another spacer according to another embodiment of the present invention, in which inclined surfaces of two spacers are aligned with each other.

FIG. 6 is a cross-sectional plan view of FIG. 5;

FIG. 7 is a longitudinal sectional view showing a conventional technique.

FIG. 8 is a longitudinal sectional view showing a conventional technique.

FIG. 9 is a longitudinal sectional view showing a conventional technique.

FIG. 10 is a longitudinal sectional view showing a conventional technique.

[Explanation of symbols]

 1: bearing device 2: shaft 3: outer circumference (outer diameter) 4: outer diameter groove 5, 6: outer ring 5a, 6a: inner diameter groove 7: raceway groove 8: rolling element 9: preload adjusting member 10, 11: spacer 10a , 11a: inclined surface

Claims (1)

[Claims] 1. A double row outer diameter groove is formed directly on an outer periphery of a shaft, and two outer rings each having an inner diameter groove with respect to the outer diameter groove are arranged separately from each other. A rolling element is incorporated into the raceway groove formed by the inner diameter groove, and a preload adjusting member is provided between the spaced outer rings to apply a preload in a direction to separate the respective outer rings. A bearing device comprising: a seat; a facing surface of each of the spacers is an inclined surface, and a preload applied to both outer rings is adjusted by moving the inclined surfaces so as to slide each other.