JPS6226844Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing structure for a turntable device, and is particularly applicable to a turntable device in which air above the turntable is sucked through an air passage in a spindle to attract a record onto the turntable. To provide a bearing structure for a turntable device that can extend the life of the bearing by shielding the lubricant added to the bearing of a spindle from the suctioned air to prevent deterioration and evaporation of the lubricant. With the goal.

The present applicant previously proposed a turntable device in which air above the turntable is sucked through an air passage in a spindle to attract a record onto the turntable. An example of this device is shown in FIG.
The spindle 1 is rotatably supported within a bearing body 2, and a turntable 3 is mounted on the upper part of the spindle 1.
are fitted and fixed. An axial ventilation passage 4 and diametrical ventilation passages 5, 6 are formed in the spindle 1. When the record 7 is placed on the turntable 3 and the suction pump 8 is activated, the air in the groove 3a on the top surface of the turntable is sucked through the ventilation channels 5, 4, 6, the space 9, and the exhaust port 10. Then, the record 7 is sucked onto the turntable 3.

The thrust bearing of the spindle 1 has a structure in which the opening edge of the lower end of the air passage 4 is brought into contact with a steel ball 12 on a steel plate piece 11 buried in the bottom of the bearing body 2. When a record is played, the spindle 1 rotates substantially integrally with the steel ball 12, and slippage occurs between the steel ball 12 and the steel plate piece 11. Accordingly, the lubricant is applied in particular between the steel ball 12 and the steel plate piece 11.

The attached lubricant is now exposed to the air in the space 9. On the other hand, the air in the space 9 is repeatedly sucked in every time a record is played, and this operation is interrupted, so that new air flows in and the air that flows in is discharged repeatedly. Therefore, the lubricant is constantly exposed to fresh air, and the lubricant evaporates and becomes too small, or oxidizes and hardens, making it no longer possible to exert the desired lubricating effect, and bearings deteriorate after a short period of use. There was a problem that this caused a malfunction.

The present invention solves the above-mentioned problems, and each embodiment thereof will be described below with reference to the drawings.

FIG. 2 shows an enlarged view of the main part of the first embodiment of the bearing structure according to the present invention. In FIG. 2, the same reference numerals as those shown in FIG. 1 are given to the constituent parts, and the explanation thereof will be omitted. 15
is a ring-shaped air seal member, which is placed on the steel plate piece 11. The inner diameter d ₁ and the thickness t of the ring-shaped air seal member 15 are determined according to the diameter of the steel ball 12, and the upper edge of the opening surrounds the steel ball 12 on the steel plate piece 11 with a slight gap. do. As a result, a space 16 that is airtight with respect to the space 9 is formed in a portion surrounded by the inner diameter wall of the ring-shaped air seal member 15 and the lower surface of the steel ball 12.

A lubricant is added within the space 16,
It does not come into contact with the air flowing in the space 9 every time a record is played. As a result, the lubricant is hard to deteriorate and has a lubricating effect over a long period of time, so that the thrust bearing can operate normally for a long period of time without running out of oil.

Note that the ring-shaped air seal member 15 is made of rubber,
Made of synthetic resin, felt, metal, etc. In the case of felt, it is impregnated with lubricating oil, and the impregnated lubricant is sequentially supplied to the contact area between the steel ball 12 and the steel plate piece 11. Especially for metals,
Noise is generated when the upper edge of the opening touches the steel ball, so
A gap is defined between the upper edge of the opening and the steel ball.

3 to 6 show the main parts of the second to fifth embodiments of the bearing structure according to the present invention, respectively.
Components that are the same as those shown in the figures are given the same reference numerals, and their explanations will be omitted.

In FIG. 3, reference numeral 17 denotes an air seal member, which has a shape that is roughly a combination of a cylindrical part and an upper lid part, and a drum-shaped hole 17a whose side wall surface is V-shaped in a vertical cross-sectional view is formed in the upper lid part. be. This air seal member 17 is placed on the steel plate piece 11, and the steel ball 12
is in contact with the steel plate piece 11 while being fitted into the drum-shaped hole 17a. The surrounding space 18 including the portion that contacts the steel ball 12 and the steel plate piece 11 is made airtight from the space 9 by the air seal member 17, so that the lubricant does not deteriorate.

This air seal member 17 is made of a deformable material such as rubber, and the steel ball 12 is inserted into the drum-shaped hole 17 in advance.
It is installed inside a. This prevents the steel ball 12 from moving around, making it easier to handle during assembly.

In FIG. 4, reference numeral 19 denotes an air seal member, which has a truncated conical shape and is placed on the steel plate piece 11. The steel ball 12 is partially fitted into the upper opening of the air seal member 19 and is in contact with the steel plate piece 11 . Since this air seal member 19 has a truncated conical shape, it can be placed with good stability. The space 20 surrounding the contact portion between the steel ball 12 and the steel plate piece 11 is shielded from the space 9 through which air flows, so that deterioration of the lubricant is unlikely to occur.

In FIG. 5, reference numeral 21 denotes a thin ring-shaped air seal member, which is placed on the bottom circumferential step 2a of the bearing body 2. As shown in FIG. The steel ball 12 is fitted into the inner diameter portion of the air seal member 21 and is in contact with the steel plate piece 11 within the bottom recess 2b of the bearing body 2. As a result, the space 22 in the bottom recess 2b is made airtight with respect to the space 9 by the air seal member 21, and no deterioration of the lubricant occurs. This air seal member 21 can be manufactured at the lowest cost.

The bearing structure of Fig. 6 is a structure that forms a desired space airtight without using an air seal member as a separate part.
A recess _2c is formed with a diameter d2 slightly larger than the diameter of the steel plate 11, and the steel ball 12 is provided in the recess 2c. The steel ball 12 is fitted into the recess 2c with a small gap between it and the opening edge of the recess 2c and is in contact with the steel plate 11. In this structure, the space 23 is also isolated from the space 9,
The lubricant is less likely to deteriorate.

FIGS. 7 and 8 show an embodiment of a thrust bearing structure that does not use steel balls. spindle 2
A ventilation passage 27 is formed within the vents 5 and 26, as indicated by a broken line. The lower end of the spindle 25 is spherical,
The lower end of the spindle 26 is a cone, and the top thereof is spherical. In FIGS. 7 and 8, substantially the same components as those shown in FIGS. 5 and 4 are designated by the same reference numerals.

In FIG. 7, a space 28 surrounding the abutting portion between the lower end spherical portion 25a of the spindle 25 and the steel plate piece 11 is shown.
is made airtight with respect to the space 9 by an air seal member 21 loosely fitted onto the spindle 25 and placed on the bottom circumferential step 2a of the bearing body 2. Further, in FIG. 8, the spindle 26 has a lower conical portion 2.
6a is fitted into the opening of the air seal member 19 and is supported in contact with the steel plate piece 11. With this air seal member 19, the surrounding space 2 of the abutting part
9 is made airtight with respect to the space 9. As a result, the same effect as in the above case can be obtained.

As described above, according to the bearing structure of the turntable device according to the present invention, there is a space around the bearing at the lower end of the spindle that is airtight with respect to the space through which air sucked when sucking a record disc passes. Since the lubricant is provided in this space, the lubricant is not exposed to the air that replaces it, and the lubricant evaporates, decreases, becomes insufficient, or oxidizes and hardens. This has the advantage of preventing the occurrence of inconveniences, allowing the bearing to function smoothly over a desired long period of time, and preventing accidents caused by insufficient lubrication of the bearing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical cross-sectional view showing an example of a bearing structure of a conventional turntable device, FIG. 3 to 6 are views showing the main parts of the second to fifth embodiments of the bearing structure according to the present invention, and FIG.
8 and 8 are diagrams showing an embodiment of a bearing structure that does not use steel balls. 1, 25, 26...Spindle, 2...Bearing body, 2a...Bottom peripheral step, 2b...Bottom recess,
2c... recess, 3... turntable, 4, 5,
6,27...Air passage, 7...Record, 8...
Suction pump, 9...Space, 10...Exhaust port, 1
1...Steel plate piece, 12...Steel ball, 15, 17, 1
9, 21...Air seal member, 16, 18, 2
0, 22, 23, 28, 29... Spacing around the bearing.

Claims (1)

[Scope of utility model registration request] In a turntable device that suctions air above the turntable through an air passage in a spindle to attract a record onto the turntable,
A bearing structure for a turntable device, wherein a space is formed around a bearing at a lower end of the spindle to be airtight with respect to a space through which the sucked air passes, and a lubricant is provided in the space.