JPH074929U - Motor oil bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an oil-impregnated bearing that can reduce seizure during rotation in a cylindrical bearing having a structure in which an oil-impregnated bearing of a motor used in various confidential devices and acoustic products is press-fitted into a metal housing. . [Structure] By forming a spiral groove b of one or more rounds in the cylindrical direction of the inner diameter surface a of the oil-impregnated bearing 1, it is possible to prevent metal contact between the oil-impregnated bearing and the shaft by the impregnated oil 3 accumulated in the groove. Becomes

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil-impregnated bearing press-fitted into a rotor shaft shaft of a motor and a metal housing.

[0002]

[Prior art]

 Conventionally, the bearing structure of a motor has a cylindrical shape with a uniform inner peripheral surface that contacts the rotor shaft, and the oil-impregnated bearing of this cylinder is simply press-fitted and fixed in a metal housing. There were many.

[0003]

[Problems to be solved by the device]

 FIG. 3 is an oil film formation diagram of impregnated oil during rotation of a conventional oil-impregnated bearing.

In the bearing having the above structure, the oil film of the impregnated oil 3 caused by the pressure difference between the oil-impregnated bearing and the rotor shaft shaft 2 due to the lateral pressure sliding causes an oil film shortage when the lateral pressure is too large, resulting in metal contact. However, there was a problem in that it could result in burn-in, which was not reliable as a bearing.

In order to prevent the seizure between the rotor shaft shaft and the oil-impregnated bearing, there is a drawback that there is no solution other than adding a small amount of the same impregnated oil by drip.

In view of the above problems, it is an object of the present invention to provide an oil-impregnated bearing that can reduce seizure due to metal contact between the rotor shaft shaft and the oil-impregnated bearing.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the oil-impregnated bearing of the motor of the present invention has a structure in which a spiral groove having a depth of about 0.1 mm is formed on the inner diameter surface in contact with the rotor shaft, to a depth of about 0.1 mm.

[0008]

[Action]

 According to the above configuration, since the spiral groove of about 0.1 mm is formed on the inner diameter surface, the impregnated oil can always be stored in the inner diameter surface. Therefore, the inner pressure surface of the oil-impregnated bearing is affected by the lateral pressure. It is possible to reduce seizure due to metal contact between the rotor shaft and the rotor shaft.

[0009]

【Example】

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

FIG. 1 is a sectional explanatory view of an oil-impregnated bearing according to the present invention. As shown in FIG. 1, an oil-impregnated bearing 1 is provided with a groove b spirally formed on the inner diameter surface a at a depth of about 0.1 mm for one or more rounds.

By providing this spiral groove, the impregnating oil 3 always exists between the rotor shaft 2 and the oil-impregnated bearing 1 as shown in FIG. 2, and the lateral pressure is always increased even when the lateral pressure is large. Since the volume of oil in the groove is present, seizure can be prevented by the effect of oil circulating through the groove.

[0012]

[Effect of device]

 As described above, the oil-impregnated bearing of the present invention can reduce the burning caused by the oil film breakage due to the lateral pressure sliding with the rotor shaft shaft in the motor having the structure in which the bearing is press-fitted into the metal housing.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view of an oil-impregnated bearing according to an embodiment of the present invention.

FIG. 2 is an oil film formation diagram of impregnated oil during rotation of the oil-impregnated bearing of the present invention.

FIG. 3 is an oil film formation diagram of a conventional oil-impregnated bearing.

[Explanation of symbols]

 1 Oil-impregnated bearing 2 Rotor shaft 3 Impregnated oil a Inner diameter surface b Spiral groove

Claims (1)

[Scope of utility model registration request] 1. An oil-impregnated bearing for a motor, comprising: a metal-made housing having an oil-impregnated bearing, wherein a spiral groove having one or more turns is provided on a rotary sliding surface.