Bearing processing method, and bearing processing apparatus
a processing apparatus and bearing technology, applied in mechanical equipment, sliding contact bearings, engine components, etc., can solve the problems of limiting the elastic deformation of sintered alloy materials, affecting the accuracy of machine tools, so as to reduce the cost, facilitate the amount of air gaps, and improve the effect of bearing quality
Inactive Publication Date: 2005-03-31
SONY CORP
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Benefits of technology
[0020] The processing method of the grooves and the processing apparatus of the present invention do not utilize the elastic deformation of a bearing itself, and by inserting the pin into the cylindrical-shaped core rod which is inserted into the inner circumference of the cylindrical-shaped bearing material, the cylindrical-shaped core rod is depressed against the inner circumference surface of the cylindrical-shaped bearing material and the concavoconvex of the outer circumference of the cylindrical-shaped core rod is transfer-printed on the inner circumference of the cylindrical-shaped bearing material. Accordingly, there becomes no limitation on the shape of the cylindrical-shaped bearing material, such as the outside diameter of the cylindrical-shaped bearing material, and it is able to adjust a size of the bearing mount portion of the motor and the like, replacement of the bearing, etc. become simple, and the handling thereof becomes easy without requiring a change of design.
[0022] The grooves are abele to be formed with fully enough depth, then it becomes possible to easily manage the air gap amount between the shaft and the inner circumference of the bearing, and this can reduce the cost.
[0023] By adapting the processing apparatus for the inner circumference grooves of the present invention, a cheap bearing having no limitation on its shape is obtained in comparison with the conventional technology.
Problems solved by technology
Further, there is a limit in the elastic deformation of the sintered alloy material 1′, and it is impossible to deform so much.
Accordingly, it is only provide concave grooves (depth of the grooves) of around 2 to 4 μm in depth, and this is also a defect that there is no freedom in the depth of the grooves.
When a hydrodynamic bearing is processed by the conventional fabrication method as mentioned above, for example, a ratio of a groove depth to an air gap amount between a rotating shaft and a bearing inner circumference becomes very important, and as the groove depth becomes shallow, the air gap amount has to be managed to be narrower, so that this causes another defect that a machine accuracy has to be more severe and this affects in cost.
As apparent from the above description, the conventional processing method for the inner circumference grooves depends on the elastic deformation of the bearing itself, and the grooves are transfer-printed, so that there is a restriction that the wall-thickness of the bearing has to be thinner, and also there is a defect that the grooves are only transfer-printed in shallow.
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[0030] Hereinafter, one of embodiments of a bearing processing method and a bearing processing apparatus of the present invention is described with reference to the attached drawings.
[0031]FIG. 1 is a sectional side view showing a part of a bearing processing apparatus of the present invention, FIGS. 2A to 2C are charts for showing a part of process for processing a bearing by applying the bearing processing apparatus of the present invention, and FIGS. 3A and 3B are charts for showing process after the process in FIGS. 2A to 2C.
[0032] The bearing processing apparatus of the present invention is described with reference to FIG. 1, at first.
[0033] A bearing processing apparatus 10 comprises a core rod 11, a sleeve 12, and a pin 13.
[0034] The core rod 11 is a cylindrical-shaped member formed with a hollow tubular portion 11A, and an outside diameter of a base portion 111 is slightly larger than an outside diameter of a later described bearing material 20. Further, an outside diame...
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Abstract
The processing method of the grooves and the processing apparatus of the present invention do not utilize the elastic deformation of a bearing itself, and by inserting the pin into the cylindrical-shaped core rod which is inserted into the inner circumference of the cylindrical-shaped bearing material, the cylindrical-shaped core rod is depressed against the inner circumference surface of the cylindrical-shaped bearing material and the concavoconvex of the outer circumference of the cylindrical-shaped core rod is transfer-printed on the inner circumference of the cylindrical-shaped bearing material.
Description
CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority from Japanese Priority Document No. 2003-337405, filed on Sep. 29, 2003 with the Japanese Patent Office, which document is hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a processing method and a processing apparatus of a bearing for supporting a rotating shaft of a motor and the like. [0004] 2. Description of the Related Art [0005] At first, a conventional bearing processing method, and a bearing processing apparatus are described with reference to the attached drawings. [0006]FIGS. 4A to 4E show sectional views for describing the conventional bearing processing method and the bearing processing apparatus, and FIG. 5 shows a side view of a forming die used in the conventional bearing processing method for forming grooves on an inner circumference surface of a bearing. [0007] Conventionally, as a processing method of a hydrod...
Claims
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Login to View More IPC IPC(8): F16C33/14B21D53/10F16C17/02F16C33/10H02K15/14
CPCF16C17/026Y10T29/49639F16C43/02F16C33/107F16C33/145F16C33/14
InventorSATO, HIROSHISHISHIDO, YUJI
OwnerSONY CORP