JPH0718056Y2 - Bearing spindle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bearing spindle device for adsorbing and supporting a disk such as an optical disk or a magnetic disk and rotating the disk.

[Conventional technology]

Generally, a bearing spindle device is used for writing information on an optical disk or a magnetic disk, or for inspection after writing.

The bearing spindle device has two bearings mounted in vertical insertion holes formed in a housing, and is rotatably supported by the bearings. A turntable is mounted on the upper end of the spindle whose upper portion is located above the upper surface of the housing. The disk mounted on the upper surface of the turntable, which is attached to the concave portion formed on the upper surface of the turntable and has a suction force, is suction-supported, and the spindle is driven by a motor to rotate the turntable. .

In order to apply suction force to the concave portion of the table, conventionally,
An axial suction passage is formed in the spindle so as to penetrate through the upper and lower end surfaces, the upper portion of the suction passage and the recess are communicated with each other, and the lower end of the suction passage and the suction generator are communicated with a tube.

[Problems to be solved by the device]

However, in the bearing spindle device configured as described above, since the spindle is supported by at least two bearings, the spindle is long and it is difficult to process the suction passage.

Further, in order to prevent the tube from twisting due to the rotation of the spindle, it is necessary to attach a rotary coupling to the lower end of the spindle, and there is a problem that the spindle becomes longer accordingly.

Further, since it is necessary to attach the rotary coupling to the lower end of the spindle, in the bearing spindle device that requires earthing, there is also a problem that the earthing pad cannot be attached to the lower end of the spindle.

Therefore, the present invention has a technical problem to solve the above-mentioned problems, to facilitate the processing of the bearing spindle device, to reduce the size thereof, and to be able to attach the earth pad.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the present invention, a pair of rolling bearings are attached to the upper and lower portions of an insertion hole opened on the upper surface of the housing, and the pair of rolling bearings are positioned on the housing of the spindle rotatably supported by the rolling bearings. In the bearing spindle device for providing a turntable on the upper end of the turntable, applying a suction force to the concave portion formed on the upper surface of the turntable to attract and support the disk placed on the upper surface of the turntable, the spindle includes: A radial lateral hole that communicates with the radial clearance formed between the pair of rolling bearings between the outer diameter surface of the spindle and the inner diameter surface of the housing, and a shaft that communicates with the lateral hole and reaches the upper end of the spindle. Direction vertical hole is provided, the vertical hole and the recess are communicated with each other through a passage, and the housing is communicated with the vertical center of the radial clearance. A suction passage which opens in the outer peripheral surface of the housing, adopts a configuration in which a suction passage for communicating the outside and the top and bottom of the radial clearance.

[Action]

According to the above structure, when the suction force is applied to the suction passage, the suction force acts on the concave portion through the radial clearance, the horizontal hole, the vertical hole, and the passage, and thus is placed on the upper surface of the turntable. The disc thus formed can be supported by suction.

Further, since the suction force acting on the radial clearance acts on the suction passage, the outside air is sucked into the radial clearance, and it is possible to prevent the grease inside the rolling bearing from being pulled out by the suction of the outside air. It is possible to prevent dust from being sucked into the rolling bearing.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the housing 1 is provided with an insertion hole 2 that opens at the upper surface, and a pair of rolling bearings 3, 3 are attached to the upper and lower portions of the insertion hole 2.

A motor rotor 5 is attached to a lower portion of a spindle 4 rotatably supported by a pair of rolling bearings 3, 3, and a motor stator 6 that forms a motor with the motor rotor 5 is mounted.
Is attached to the lower inside of the housing 1.

Therefore, the spindle 4 is rotated by energizing the motor stator 6, and an encoder 7 for detecting the rotation angle of the spindle 4 is attached to the lower end of the spindle 4. A protrusion 4'is provided at the lower end of the spindle 4, and the other end of an elastic earth piece 20 'having one end abutted on the protrusion 4'is attached to the lower surface of the housing 1.

The upper portion of the spindle 4 is located above the upper surface of the housing 1, and a turntable 8 attached to the upper end of the spindle 4 is provided with a disk suction recess 9 on the upper surface thereof.

Here, the recess 9 may be a hole or a groove. The other end of the passage 10 whose one end communicates with the recess 9 communicates with a radial clearance 12 provided between the spindle 4 and the insertion hole 2 via a communication passage 11 formed in the spindle 4.

The communication passage 11 has a horizontal hole 13 extending radially from the outer diameter surface of the spindle 4 and a vertical hole 14 extending axially from the upper end surface of the spindle 4 and communicating with the horizontal hole 13. Hole 14
The tip of the hole 15 that extends obliquely from the upper part of the is communicated with the other end of the passage 10.

Instead of the hole 15, a concave portion communicating with the vertical hole 14 may be formed on the lower surface of the table 8, and the other end of the passage 10 may communicate with the concave portion.

Further, in the drawing, an annular groove 16 is formed on the outer peripheral surface of the spindle 4 and the outer end of the lateral hole 13 is communicated with the annular groove 16, but the annular groove 16 may be omitted.

The housing 1 has the radial clearance from the outer peripheral surface.
A suction passage 17 is formed toward 12, and the suction passage 17 is
It is connected to a suction generator (not shown) via a tube. Therefore, the suction passage 17 is activated by the operation of the suction generator.
When a suction force is applied to the
It acts on the concave portion 9 via the communication passage 12, the communication passage 11 and the passage 10.

At this time, if the radial clearance 12 is too wide, the suction force acting on the recess 9 is weakened. Therefore, the radial clearance 12 is preferably a small clearance, and in the case of the embodiment, it is set to 30 μm or less.

If the suction force acting on the radial clearance 12 is too strong, the grease inside the pair of rolling bearings 3 may be drawn out, resulting in poor lubrication, and external dust may be sucked into the rolling bearing 3.

To prevent this, the housing 1 has a radial clearance.
An intake passage 18 that communicates with the upper and lower portions of 12 is formed, and the tip of the suction passage 18 is communicated with a motor storage space 19 provided in the lower portion of the housing 1. Through this motor storage space 19, the outside air has a radial clearance 12 It is configured so that a large suction force is not applied to the inside of the rolling bearing 3 by being sucked into.

The tip of the suction passage 18 may be opened on the outer peripheral surface of the housing 1.

In order to adsorb a disc using the bearing spindle device having the above-mentioned structure, the disc D is turned by the turntable 8
Placed on the upper surface of, and then apply suction force to the suction passage 17,
The suction force is applied to the radial clearance 12, the communication passage 11 and the passage 10.
It is made to act on the concave portion 9 via.

Since the radial clearance 12 and the intake passage 18 are communicated with each other when the disk is adsorbed as described above, the suction force acting on the intake passage 18 causes the outside air to pass from the intake passage 18 through the motor storage space 19 to the radial clearance 12. It is possible to prevent the inside of the rolling bearing 3 from being strongly sucked by the suction of the outside air flowing into the inside.

Therefore, the grease inside the rolling bearing 3 is not drawn out, and external dust can be prevented from being sucked into the inside of the rolling bearing 3.

[Effect of device]

As described above, in this invention, the suction passage is provided in the housing, and the suction force acting on the suction passage is provided to the recess of the turntable through the radial clearance, the radial horizontal hole and the axial vertical hole provided in the spindle. Since it is made to act, it is extremely easy to form a hole in the spindle as compared with the conventional bearing spindle device in which the suction passages that penetrate the upper and lower ends are formed in the spindle.

Further, since the suction passage is formed in the housing, the axial length becomes shorter as compared with the conventional bearing spindle device in which the rotary coupling is attached to the lower end of the spindle, and the device can be downsized. A ground pad can be attached to the lower end of the spindle.

In addition, the intake passages are connected to the upper and lower parts of the radial clearance so that the outside air is sucked into the radial clearance, so that the grease inside the rolling bearing is not drawn out and dust is prevented from being sucked into the rolling bearing. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a bearing spindle device according to the present invention. 1 ... Housing, 2 ... Insertion hole, 3 ... Rolling bearing,
4 ... spindle, 8 ... turntable, 9 ... recess, 10 ... passage, 12 ... radial clearance, 13 ... lateral hole,
14 …… Vertical hole, 17 …… Suction passage, 18 …… Intake passage.

Claims (1)

[Scope of utility model registration request] 1. A pair of rolling bearings are attached to upper and lower portions of an insertion hole opened on the upper surface of a housing, and a turntable is provided at an upper end portion of the spindle rotatably supported by the rolling bearings, which is located on the housing. In a bearing spindle device that applies a suction force to a concave portion formed on the upper surface of the turntable to adsorb and support a disk placed on the upper surface of the turntable, the spindle includes an outer diameter surface of the spindle and an inner diameter of the housing. A radial horizontal hole that communicates with the radial bearing formed between the pair of rolling bearings and a surface, and an axial vertical hole that communicates with the radial clearance and reaches the upper end of the spindle are provided. A suction passage communicating with the hole and the recess through a passage, and communicating with the vertical center of the radial clearance in the housing and opening at the outer peripheral surface of the housing. , Bearing spindle device being characterized in that provided an intake passage for communicating the outside and the top and bottom of the radial clearance.