JP2011089533A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device having the aligning function with a small number of components and with a simple constitution. <P>SOLUTION: An elastic body 215 is held by bearings 202 and 203 arrayed in the axial direction, and the bearings are held by bearing holding parts 207 and 208. The bearings 202 and 203 are pressed against supporting ring parts 217 and 218 of the bearing holding parts by the repulsive force of the elastic body 215 compressed by the bearing holding parts, achieving the aligning function for mitigating the relative inclination between the bearings and a shaft 201 thereby. Further, the inside diameter of a center hole of the elastic body 215 is set to be larger than that of center holes of the bearings 202 and 203 to achieve a hollow structure, to suppress the contact of the shaft with the bearings, and to reduce bearing losses. Still further, the elastic body 215 contains lubricating oil therein, and has the function as an oil-containing material. Thus, the smooth operation of the bearing device can be achieved thereby, any seizure of the bearing device caused by depletion of lubricating oil can be prevented, and the number of components can be reduced. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a plain bearing device having an alignment function.

An example in which a sliding bearing is used in a motor having a structure in which a shaft serving as a rotation center is supported by two or more bearing devices will be described.
FIG. 3 shows the configuration of one bearing device. The bearing device includes a shaft 1 that is a rotating body, a bearing 2 that supports the shaft 1, a bearing stand 3 that holds the bearing 2, and a bearing holding portion 4. The axial center side of the bearing 2 is held by the bearing stand 3, and the shaft tip side of the bearing 2 is held by the bearing holding portion 4 via the spring plate 6.
In the case of the motor shown in FIG. 4, there are two bearing devices that support the shaft 1 in the axial direction, and the shaft 1 is rotatably supported by these two bearing devices. When the bearing center of the bearing 2 with respect to the shaft 1 and the bearing center of the bearing 12 do not coincide with each other, a relative deviation occurs between the bearing 2 and the bearing 12, and the shaft comes into contact with the inner surface of the bearing. The occurrence of contact with each piece causes damage such as seizure and wear of the bearing device, and adversely affects the life of the motor.
In order to solve the above-described problem, in the conventional sliding bearing, the spring plate 6 is disposed between the bearing 2 having a spherical outer periphery and the bearing holding portion 4, so that the bearing 2 is moved by the repulsive force of the spring plate 6. The bearing 2 is pressed against the support ring portion 7 of the bearing stand 3, and the bearing 2 can be freely tilted with respect to the support ring portion 7. With the above structure, the relative inclination between the shaft 1 and the bearing 2 is alleviated. Further, by providing the bearing 12 with the same alignment mechanism as that of the bearing 2, the relative deviation of the bearing center that occurs between the bearing 2 and the bearing 12 is alleviated, and the contact of the shaft with the inner surface of the bearing is prevented. is doing.
In the bearing device, since the bearing loss also affects the efficiency of the motor, it is necessary to reduce the generated bearing loss as much as possible. Since the bearing loss occurs when the shaft 1 contacts the bearing 2 on the inner surface of the bearing 2 where the shaft 1 and the bearing 2 face each other, as shown in FIG. A hollow structure is known that provides a recess for widening the gap between the bearing 22 and the bearing 22 to prevent contact between the shaft and the inside of the bearing and reduce bearing loss.
Further, in the bearing device, when the lubricating oil is depleted from the bearing surface, damage such as seizure occurs between the bearing 2 and the shaft 1, and the function as the bearing is lost. Therefore, prevention of lubricating oil depletion is a necessary technique for long-term maintenance-free use. In the sliding bearing, a technique is used in which lubricating oil is used between the shaft and the bearing to prevent friction and wear and extend the life. Therefore, a technique is known in which the material of the bearing is a porous material, and the porous material is impregnated with lubricating oil to prevent depletion of the lubricating oil on the bearing surface. In addition, as shown in FIG. 3, there is a method in which the oil retaining material 5 is installed adjacent to the bearing 2, the lubricating oil is delivered between the bearing 2 and the oil retaining material 5, and the lubricating oil is supplied to the bearing. Are known.

JP-A-62-81948

Conventionally, a bearing device using a slide bearing having an alignment function generally has a spherical outer peripheral portion, and the spherical bearing is adjusted by rotating it while being pressed against a bearing base by a spring plate. It has a core function. However, the conventional bearing requires a dedicated die and a processing machine in order to process the outer periphery of the sliding bearing into a spherical shape. In addition, since the outer peripheral portion of the slide bearing is spherical, it requires a complicated structure to hold it and parts such as a spring plate, and further requires a spherical volume of bearing material. There are problems in terms of costs, processing costs, and resource saving.
In addition, in order to improve the bearing loss of a sliding bearing, conventionally, a method of providing a recess inside the bearing facing the shaft is known, but this method complicates the mold for manufacturing the bearing and costs high. .
In order to extend the life of a sliding bearing, conventionally, a technique is known in which lubricating oil is supplied from an oil retaining material installed around the bearing to prevent depletion of the lubricating oil on the bearing surface. However, this method increases the number of parts by the amount of the oil retaining material, and further hinders downsizing of the bearing device.
In order to solve the above-described conventional problems, the present invention provides a resource-saving and inexpensive sliding bearing device that has a centering function equivalent to that of the prior art, that is easy to process and assemble the bearing, and that has a reduced number of parts. The purpose is to provide.

In order to solve the above-described conventional problems, the present invention provides a bearing device including a bearing that supports a shaft, which is a rotating body, penetrating through a hole provided in a central portion, and a bearing holding portion that holds the bearing. The bearings are flat and ring-shaped, and are arranged in at least two in the axial direction. An elastic body is sandwiched between the two or more bearings and the bearing, and the bearing and the elastic body are sandwiched by the bearing holding material. It is a bearing device to hold.
With this configuration, the bearing is pressed against the inside of the bearing holding portion by the repulsive force of the elastic body, and has a centering function that relaxes the relative inclination between the shaft inclination and the bearing. It is possible to prevent the shaft from coming into contact with one another, which causes damage to the bearing device such as wear.
Furthermore, since the annular bearing does not require a dedicated die or the like like a conventional spherical bearing, it can be easily manufactured at low cost.
Furthermore, the bearing device of the present invention has a structure in which a plurality of flat annular bearings are arranged in the axial direction and an elastic body is sandwiched between the bearings. Unlike conventional methods for widening the gap between the shaft and the bearing, the gap between the shaft and the inner surface of the bearing can be widened without complicated processing. Therefore, bearing loss can be reduced with a simple structure.
Furthermore, since the bearing device of the present invention does not require a spring plate for pressing the bearing against the bearing base or a complicated structure for installing the bearing, the number of parts and man-hours can be reduced.
Further, the present invention is a bearing device in which the elastic body sandwiched between the bearings has an annular shape, and the inner diameter of the central hole of the elastic body is larger than the inner diameter of the central hole of the bearing. With this configuration, it is possible to form a space that prevents axial contact between the bearings arranged in the axial direction, so that the bearing loss can be reduced without complicated processing as in the conventional bearing. be able to.

In addition, the present invention is a bearing device having a function of supplying lubricating oil to the bearing, including lubricating oil in an elastic body sandwiched between the bearings. With this configuration, the elastic body has a function of supplying lubricant to the bearing, so the oil retaining material that has been provided in the periphery of the bearing is no longer required, the number of parts can be reduced, and the bearing device can be reduced in size. Can be realized.
Moreover, this invention is a bearing apparatus which uses the porous material as a material of a bearing. With this configuration, the porous material of the bearing can be impregnated with the lubricating oil, and depletion of the lubricating oil on the bearing surface can be prevented.

  Moreover, this invention is a bearing apparatus which uses the resin material for the elastic body inserted | pinched between a bearing and a bearing. Since an elastic body made of a resin material is easier to process than metal, it can be manufactured more easily.

As described above, the present invention can manufacture a bearing device having a centering function with a simple structure with a smaller number of parts than conventional ones. A bearing device that contributes to resource saving can be provided.
Further, if the bearing device of the present invention is used for a motor, it is possible to provide a motor that is inexpensive, has a long life, and contributes to resource saving.

  According to the present invention, it is possible to manufacture a bearing device having an alignment function with a simple structure and a small number of parts, compared with a conventional bearing device having a complex alignment function, and thus a bearing that is inexpensive and contributes to resource saving. An apparatus can be provided.

FIG. 1 is a cross-sectional view of the bearing of the present invention. FIG. 2 is a cross-sectional view of a motor using the bearing of the present invention. FIG. 3 is a cross-sectional view of a conventional bearing. FIG. 4 is a cross-sectional view of a motor using a conventional bearing. FIG. 5 is a cross-sectional view of a bearing provided with a hollow structure in a conventional bearing.

Hereinafter, a bearing device according to an embodiment of the present invention will be described with reference to the drawings.
In the bearing device of the present invention, two or more bearings on the ring are arranged in the axial direction, and an annular elastic body is sandwiched between the two or more bearings and the bearing. The two bearings sandwiching the elastic body are held so as to be wrapped from above and below in the axial direction by two cup-shaped bearing holding portions provided with a hole through which the shaft passes in the central portion. When the bearing is pressed by the bearing holding portion, the sandwiched elastic body is compressed. The bearing is pressed against the support ring portions of the upper and lower bearing holding portions by the repulsive force caused by the compression of the elastic body. The bearing can be freely tilted with respect to the support ring portion of the bearing holding portion in pressure contact, and the relative tilt between the shaft tilt and the bearing can be reduced. As a result, it is possible to provide a bearing having a centering function with respect to the shaft that is the rotating body.
Further, it is desirable to use an elastic body sandwiched between the bearings in which the inner diameter of the central hole is larger than the inner diameter of the central hole of the bearing. With the above-described configuration, a space that prevents axial contact can be formed between the bearings arranged in the axial direction, so that the bearing loss can be reduced without complicated processing as in the conventional bearing. be able to.
Moreover, a metal porous sintered body is used for the material of the bearing which comprises a bearing apparatus. The bearing and the bearing holder are in pressure contact with each other. By using a metal porous sintered body having excellent slidability as the material of the bearing, it is possible to prevent wear of the press contact portion between the bearing and the bearing holding portion and to enable smooth operation of the bearing. Furthermore, since the metal porous sintered body has a function of impregnating a lubricating oil that is a liquid lubricating component, it is possible to improve the slidability of the bearing portion and realize smoother rotation of the shaft.

  Further, the elastic body is made of an oil-impregnable material such as a fiber. As a result, the lubricant can be delivered between the bearing and the elastic body, and the lubricant is supplied not only to the sliding portion of the shaft and the bearing but also to the pressure contact portion of the bearing and the bearing base. Suppression of wear and smooth rotation at the press contact portion can be realized.

  FIG. 1 is a cross-sectional view of a plain bearing device of the present invention.

As shown in FIG. 1, in the bearing device of the present invention, flat and annular bearings 202 and 203 are arranged in the axial direction, and an annular elastic body 215 is sandwiched between the two bearings. The bearings 202 and 203 sandwiching the elastic body 215 are held so as to be wrapped from above and below in the axial direction by cup-shaped bearing holding portions 207 and 208 provided with a hole penetrating the shaft at the center. That is, the bearing 202 is held in contact with the bearing holding portion 207, and the bearing 203 is held in contact with the bearing holding portion 208. The bearing holding portions 207 and 208 compress the elastic body 215 through the bearings 202 and 203, and the bearings 202 and 203 are pressed against the upper and lower bearing holding portions 207 and 208 by the repulsive force of the compressed elastic body 215. Further, due to the repulsive force of the elastic body, the bearing 202 freely tilts with respect to the support ring portion 217 of the bearing holding portion 207, and the bearing 203 freely tilts with respect to the support ring portion 218 of the bearing holding portion 208. By the action, the inclination of the shaft 201 which is a rotating body and the relative inclination between the bearings 202 and 203 are alleviated, and it is possible to provide a bearing device having a centering function.
As the elastic body 215 sandwiched between the bearings 202 and 203, an elastic body having an inner diameter of the central hole larger than the inner diameter of the central hole of the bearing is used. As a result, a space 209 that prevents axial contact between the bearings 202 and 203 arranged in the axial direction can be formed, so that reduction in bearing loss can be achieved without complicated processing as in a conventional bearing. Can be planned.

The bearing 202 and the bearing 203 are made of a metal porous sintered body. In the configuration of this bearing device, the bearing 202 is in pressure contact with the bearing holding portion 207 and the bearing 203 is in pressure contact with the bearing holding portion 208. Since the metal porous sintered body has a function of impregnating the inside of the lubricant, it suppresses the wear of the above-mentioned pressure contact portion, and allows free movement of the bearings 202 and 203 and smoother rotation of the shaft 201. To do.
Moreover, it is preferable to use a resin material that is easier to process than a metal material for the elastic body 215 constituting the sliding bearing device. Also, the elastic material 215 is made of a material that is capable of delivering lubricating oil between the bearing 202 and the bearing 203 and supplying lubricating oil to the bearing. For example, a felt-like or cotton-like one may be selected. For example, when a hollow fiber having a high oil impregnation function is used as the fibrous material having oil retaining performance, the amount of lubricating oil that can be supplied to the bearings 202 and 203 can be increased.
FIG. 2 is a sectional view of a motor using the bearing device according to the embodiment of the present invention.
As shown in FIG. 2, in the motor using the bearing device of the present invention, the two bearing devices are used. The two bearing devices each have a bearing center with respect to the shaft 201, but the bearing center can be adjusted more appropriately by the synergistic effect of the alignment function of the individual bearing devices.

  According to the present invention, it is possible to provide a bearing having a centering function while reducing the number of parts and material cost and reducing bearing loss. Is preferred. However, the bearing of the present invention is not limited to these applications, and can be used in a wide range as a motor bearing that requires an alignment function.

1,201 axes
2, 12, 202, 203 Bearing 3, 13 Bearing base 4, 14, 207, 208 Bearing holding part 5, 15 Oil retaining material 6, 16 Spring plate 7, 217, 218 Support ring part 8, 18 Motor bracket 22 Structure bearing
31 Rotor 32 Stator 33 Structural Material 209 Elastic Body Center Hole 215 Elastic Body

Claims (6)

In a bearing device comprising a bearing that supports a shaft that is a rotating body by penetrating through a hole provided in a central portion, and a bearing holding portion that holds the bearing, the bearing has a flat annular shape and is axially A bearing device in which at least two or more are arranged, an elastic body is sandwiched between the two or more bearings, the bearing and the elastic body are held by the bearing holding portion, and the shaft is rotatably supported. . The bearing device according to claim 1, wherein the elastic body has an annular shape, and an inner diameter of a hole provided in a central portion of the elastic body is larger than an inner diameter of a hole provided in the central portion of the bearing. The bearing device according to claim 1, wherein the elastic body includes lubricating oil therein. The bearing device according to claim 1, wherein the bearing is made of a porous body. The bearing device according to claim 1, wherein the elastic body is made of a resin material. The motor provided with the bearing apparatus in any one of Claims 1-5.

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