JPS60237221A - Bearing unit - Google Patents

Abstract

PURPOSE:To afford an excellent rigidity to a moment load by providing a plurality of radial bearing holes of a thrust radial bearing on a rotary shaft in a mutually separated manner. CONSTITUTION:A rotor 1 has a rotary shaft 1a and a thrust plate 1b and a housing 2 is provided with receiving faces 4 forming a fluid passage. Since two radial receiving parts 2b and 3a are provided in parallel to each other at a distance L, the receiving parts 2b and 3a have a tolerance to a moment load applied to the rotary shaft 1a. The tolerance is added to the tolerance possessed by thrust receiving parts 2a and 2c, and hence the rigidity of the bearing is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a radial thrust fluid bearing consisting of a rotor having a rotating shaft and a thrust plate, and a housing. It is related to

Conventional bearings of this type have radial bearing surfaces 4, 4, . A receiving portion 1b and thrust receiving portions 2a and 2c are configured.The receiving surface 4 has a porous restricting mechanism formed of a porous material such as graphite, an orifice, a self-restricted restricting mechanism, a surface restricting mechanism, etc. , fluid pressure is supplied from a supply source (not shown). However, in such a structure, the moment load applied to the rotating shaft 1a + 2 (the radial bearing part 2b has almost no resistance to 2, and most of the load is applied to the thrust bearing). It has been accepted in sections 2a and 2c.

Therefore, when the moment load increases, it becomes necessary to increase the size of the thrust receiver, but even if the thrust receiver is made larger, the resistance C2 of the thrust receiver relative to this type of load (2) has a limit, so the moment load increases ( This has the disadvantage that the rigidity of the secondary bearing decreases.

An object of the present invention is to overcome the above-mentioned drawbacks and to provide another radial receiving part at a position spaced apart from the radial receiving part in the direction of the rotation axis, thereby imparting rigidity to the radial receiving part C2 moment load. The object of the present invention is to provide a bearing device having excellent rigidity against moment loads.

That is, a rotor having a rotating shaft and a thrust portion extending in a radial direction f2 from the rotating shaft, a radial bearing hole through which the rotating shaft loosely passes to form a radial fluid passage, and a thrust fluid passage spaced apart from the thrust portion. A thrust radial bearing consisting of a housing with a thrust bearing surface that forms a The present invention provides a bearing device with excellent rigidity.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Fig. 2 is a sectional view of an embodiment of a radial thrust fluid bearing according to the present invention, and Fig. FIG. 7 is a cross-sectional view of another embodiment.

Figure 2 (In 2, 1 is the rotating shaft 1a and the thrust plate 1b.
2 is a housing provided with a bearing surface 4 forming a fluid passage; 3 is a housing 2 also provided with a bearing surface 4;
, 2a and 2c are thrust receiving parts composed of a receiving part 4, 2b and 3a are radial receiving parts, and the rotor 1 (two thrust bearing parts 2a,
2c is configured so that the radial load can be received by two radial receiving parts.

The above configuration (2, two radial receiving portions 2b).

6a are arranged in parallel with a distance between them, both radial receiving parts 2b and 3a have resistance to the moment load [2] applied to the rotating shaft 1ai, and this resistance is due to the resistance of the thrust receiving parts 2a and 2c. The added resistance (2) improves the rigidity of the bearing.

The table below shows the conventional bearing shown in Fig. 1, the bearing according to the present invention shown in Fig. These are the experimental results of measuring the amount.

As is clear from the table, C2, the bearing according to the present invention (2) has less than half the amount of misalignment compared to the conventional bearing (1), and the rigidity is more than twice (2) improved.

In another embodiment shown in FIG. Thrust load is transferred by two thrust receivers 2a and 2c to two radial receivers 2b.
, 2b are configured to receive a radial load. In this way, since the two radial receiving parts 2b and 2b' are arranged in parallel at a predetermined interval, the moment that the rolling axis 1ar2 is As explained above, the radial thrust hydrodynamic bearing device according to the present invention has the ability to withstand loads (:), and the rigidity of the bearing is also improved. Although a plurality of radial receivers are provided, these radial receivers have rigidity against the moment load (2) that would cause the thrust receiver to cling to the rotating shaft, and this resistance is the resistance of the thrust receiver (2). (2) It has the advantage of greatly improving the rigidity of the bearing device.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional radial thrust fluid bearing.
Fig. 2 is a cross-sectional view of one embodiment according to the present invention (2), and Fig. 6 is a cross-sectional view of another embodiment according to the present invention (2). ...Thrust plate 2...Housing 2a, 2
c...Thrust receiving part 2b, 2b'...Radial receiving part 3...Housing extension part 3a...Radial receiving part 4...Best surface Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] A rotor having a rotating shaft and a thrust portion extending radially from the rotating shaft, a radial bearing hole through which the rotating shaft loosely passes to form a radial fluid passage, and a radial bearing hole spaced apart from the thrust portion to form a thrust fluid passage. A thrust radial bearing consisting of a housing with a thrust bearing surface (2), the radial bearing holes are located on the rotation axis (-
A bearing device characterized by having multiple bearings spaced two or more times apart.