JPS62278310A - Bearing device - Google Patents

Abstract

PURPOSE:To obtain a bearing device of good efficiency, by providing a receiving plate of high hardness respectively in the end of a shaft and in the internal bottom surface of a frame and mounting a ball rollably interposing between these receiving plates so that rolling friction is obtained by the ball making a planetary motion. CONSTITUTION:A shaft 11, which is fitted to be inserted into an opening part 10a of a bottommed cylindrical frame 10, is given tension in the thrust direction. Here a bearing provides the first receiving plate 12 made by an artificial ruby in the end of the shaft 11 further the second receiving plate 13 similarly made by an artificial ruby in the internal bottom surface of the frame 10. And a single ball 14 is mounted interposing between both the receiving plates 12, 13. Here the ball 14 forms its external diameter larger than at least a half of the internal diameter (d) of the frame 10. By the above constitution, the ball 14, which performs a planetary motion between both the receiving plates 12, 13 if the shaft 11 rotates, diffuses grease interposed between both the receiving plates 12, 13 and the ball 14, and good lubricating action is obtained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a bearing device suitable for use in electronic devices such as magnetic disk drives.

[Conventional technology]

Conventional bearing devices have a tension spring in the thrust direction,
A structure is known in which a plurality of balls are rotatably stored and inserted between the balls from the opening side of a 7'C7 frame, and the conical protrusion is rotatably supported by these balls. There is. Such a bearing device can be said to be highly efficient due to rolling friction, and to have an automatic centripetal function and to be free of play. However, since the conical protrusion of the shaft functions as the inner ring of the ball bearing, its surface The conical protrusion requires special processing, such as requiring a mirror finish and quenching for longer life, resulting in higher costs. .

In order to eliminate this drawback, a bearing device having a structure as shown in FIG. 2 has been proposed.

The main parts of this bearing device are a 7-frame cylindrical frame 1 with a bottom, a plurality of planetary balls 2 that come into contact with the inner wall surface of this frame 1, and a plurality of planetary balls 2 that stand out from the inner bottom surface of the frame 1. It consists of a main ball 3 held in the center as shown in FIG. The contact spherical surface portion 3 smaller than the main ball 30 hemisphere is exposed upward from 4a in the figure.
a comes into contact with a conical groove 5a formed at the end of the shaft 5. Since the shaft 5, which is tensioned in the thrust direction by a biasing means (not shown), presses the main ball 3, the shaft 5 and the main ball 3 rotate integrally, and the main ball 3 and the planetary ball 2, and as a result, an automatic centripetal function and rolling friction can be obtained without special processing on the shaft 5 itself. Incidentally, related bearing devices of this type include Utility Model Application No. 58-92056.

Further, as shown in FIG. 3, a conical groove 5a similar to the conical groove 5a of the shaft 50 is provided on the inner bottom surface of the 7-frame 1, and one ball 6 is brought into contact with this conical groove la via grease. Accordingly, a bearing device has also been proposed in which the planetary balls 2 are not necessary and a ball 6 that rotates integrally with the shaft 5 is slid and rotated on a conical groove la.

[Problem that the invention seeks to solve]

However, in the case of the conventional example shown in FIG. 2, since the main ball 3 and the plurality of planetary balls 2 are required, there is a problem that the number of parts increases. In addition, in the case of the conventional example shown in FIG. 3, although the number of parts can be reduced, since the movement is not planetary, it is difficult to make rolling contact, and the contact portion between the ball 6 and the cones #1a and #5a has 4/4 There is a problem in that the # agent is difficult to spread and the abutting portions between the ball 6 and the conical grooves 1a, 5a are worn out due to aging.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to provide a bearing device iL that is simple in structure, reduces the number of parts, and is efficient due to rolling friction.
The aim is to provide the following at low cost.

[Means for solving problems]

In order to achieve the above object, the present invention stores a ball in a bottomed cylindrical frame having an opening, and an axial end of a shaft inserted into the frame through the opening 1111. In a bearing device rotatably supported through a hole, a first receiving plate of high hardness is provided at the end of the shaft, and a second receiving plate of similarly high hardness is provided on the inner bottom surface of the frame. provided, these first and second
The ball is rotatably interposed between the receiving plates of the ball.

[Effect]

That is, according to the above means, a ball is rotatably interposed between the first receiving plate that rotates integrally with the end of the shaft and the second receiving plate provided on the inner bottom surface of the frame. Therefore, when the shaft rotates, the balls move between the first and second balls.
A rolling Js stamp is obtained by performing planetary motion between the receiving plates, and since these first and second receiving plates have day hardness, there is no risk of wear, and a long life can be achieved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a main part of an embodiment of a bearing device according to the invention. In the figure, 10 is a bottomed cylindrical frame having an opening 10a, 11 is a shaft that is fitted into the opening 10a of the frame 10 and is tensioned in the thrust direction, and 12 is the shaft 11. A first receiving plate on the back of the artificial ruby provided at the end of the shaft, 13 a second receiving plate also made of artificial ruby and provided on the inner bottom surface of the frame 10, and 14 these first and second receiving plates. This is one ball interposed between 12 and 13, and the outer diameter of this ball 14 is larger than at least half of the inner diameter d of the frame 10.

In the above configuration, the shaft 11 presses the first receiving plate 12 against the ball 14 by means of a tension member, so that the ball 14 is pushed between the first receiving plate 12 and the second receiving plate 1
It is sandwiched between 3. When the shaft 11 rotates, the first receiving plate 12 rotates integrally with the shaft 11, and the ball 14 performs a planetary movement 5 between the first and second receiving plates 12 and 13. As a result, the grease that is interposed in a film between the first and second receiving plates 12, 13 and the ball 14 is evenly distributed over the contact area, so that the shaft 11 rolls smoothly and rotates efficiently with just 9 rubs. can do. In addition, since the first and second receiving plates 12 and 13 are made of high-hardness and inexpensive artificial ruby, they hardly become irritated even when used for a long time.
There is no need to worry about cost increases. Furthermore, this bearing device has an extremely simple configuration, does not require special machining, and requires only a small number of parts.

In the above embodiment, the mud 1 and the second receiving plate 12.
Although the case has been described in which one ball 14 having a relatively large diameter is disposed between the balls 13, a plurality of balls having a diameter smaller than the ball 14 may be disposed.

Further, when the shaft 11 is to be rotated at high speed, an oil-impregnated bearing (metal) may be inserted as a radial direction bearing near the opening 10a of the 7V-muIQ.

〔Effect of the invention〕

As explained above, according to the present invention, the ball performs a planetary motion between the first receiving slope and the second receiving plate, and rolling J# is obtained. The receiving plate of Kaede is highly hard, so there is no abrasion and it has a long lifespan.Furthermore, the overall structure is simple, requiring special processing, and the number of parts is small. have an effect.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a bearing device according to the present invention.
2 is a sectional view of a main part showing an example of a conventional bearing device, and FIG. 3 is a wT sectional view of a main part showing another example of a conventional bearing device. DESCRIPTION OF SYMBOLS 10... Frame, 10a... Opening, 11... Shaft, 12... First receiving plate, 13... Second Receiving plate, 14...
··ball. Fig. 1 4 d-1≠ Fig. 2

Claims (1)

[Claims] A ball is housed in a bottomed cylindrical frame having an opening, and an axial end of a shaft inserted into the frame from the opening side is rotatably supported via the ball. In the bearing device, a first receiving plate of high hardness is provided at the end of the shaft, and a second receiving plate of high hardness is provided on the inner bottom surface of the frame, and a gap between the first and second receiving plates is provided. A bearing device characterized in that the balls are rotatably interposed in the bearing device.