JPH09112564A - Slide bearing of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the removal of a bearing sliding member from a bearing base metal, and to replace the bearing sliding member easily. SOLUTION: A bearing sliding member 4 provided on the inner periphery of a bearing base metal 2 is composed of plural unit sliding members 4a provided continuously in the peripheral direction. A dovetail 6 is provided to each unit sliding member 4a. Dovetail grooves 5 are provided on the inner peripheral surface of the bearing base metal 2. By engaging the dovetails 6 to the dovetail grooves 5, the unit sliding members 4a can be positioned and fixed to the bearing base metal 2. The unit sliding member 4a is made of a polytetraphloroechylene resin, for example, and steps 7 are provided at both ends of each member 4a in the peripheral direction. An oil groove 8 is formed of two steps 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing of a rotary electric machine, and more particularly to a slide bearing of a rotary electric machine capable of preventing a bearing sliding member from being separated from a bearing base metal.

[0002]

2. Description of the Related Art Conventionally, in a sliding bearing of a rotary electric machine, a soft metal white metal is injected and adhered to the inner peripheral portion of a bearing base made of an iron material such as mild steel or cast iron by centrifugal casting or the like. The method of forming the sliding member is adopted. Further, the oil groove and the like for forming an oil film between the bearing sliding member and the rotary shaft are manufactured by centrifugally casting the bearing sliding member and then machining the inner peripheral portion thereof.

[0003]

In the conventional sliding bearing of the rotary electric machine, an iron material which is a material of a bearing base metal,
Since the coefficient of thermal expansion is different from that of white metal, which is the material of the bearing sliding member, the contact changes due to heat change due to repeated cold heat accompanying operation of the rotating electrical machine and fatigue over time, and the bearing sliding member Is separated from the bearing base metal. Further, the white metal, which is the material of the bearing sliding member, wears down after many years of operation, and the gap between it and the rotating shaft expands, causing problems such as increased vibration. Then, as a countermeasure for such nonconformity, it is conceivable to replace the entire plain bearing including the bearing base metal with a new one, or to inject white metal, etc. Therefore, there is a problem that the plant must be stopped for a long time.

Therefore, an object of the present invention is to provide a sliding bearing for a rotary electric machine which can prevent the bearing sliding member from being separated from the bearing base metal. Another object of the present invention is to provide a sliding bearing for a rotary electric machine, which can form an oil groove in a bearing sliding member without machining. Still another object of the present invention is to provide a sliding bearing for a rotary electric machine, which can be replaced easily and in a short period of time even if wear occurs over time.

[0005]

In order to achieve the above object, the present invention provides a rotary bearing having a substantially cylindrical bearing base, and a bearing sliding member for rotatably supporting a rotary shaft disposed on the inner peripheral portion of the bearing base metal. In a sliding bearing of an electric machine, the bearing sliding member is formed of a low-wear material that does not swell with oil and has good slidability, and the bearing sliding member and the bearing base metal have a separate structure, and The bearing sliding member is detachably fixed to the bearing base metal by a connecting means.

Further, the bearing sliding member and the bearing base metal are formed as separate members, and they are fixed to each other by a connecting means to prevent the bearing sliding member from being separated from the bearing base metal, which has been a problem in the past. It becomes possible to do. Further, when wear occurs over time, only the bearing sliding member can be replaced, and the work can be performed easily and in a short period of time. As the low wear material, for example, polytetrafluoroethylene resin is used.

According to the present invention, the bearing sliding member is composed of a plurality of unit sliding members arranged in the circumferential direction, and stepped portions are formed at corners on the inner circumferential side at both circumferential ends of each unit sliding member. When each is provided and each unit sliding part is arranged in the circumferential direction,
It is characterized in that an axial oil groove is formed by two adjacent step portions. Further, by constructing the bearing sliding member with a plurality of unit sliding members, replacement work of the bearing sliding member becomes easier, and since the oil groove is formed by the stepped portion, it is possible to form the oil groove. No machining required.

The present invention is also characterized in that the connecting means is constituted by a dovetail and a dovetail groove. As a result, it is possible to easily fix the bearing sliding member to the bearing base metal not only when it is made up of a plurality of unit sliding members but also when it is made up of a single member. Become.

According to the present invention, the connecting member is attached to the notches which are provided at both ends of each unit sliding member in the circumferential direction and which are open in the circumferential direction, and the key members for simultaneously positioning and supporting the unit sliding members on both sides are provided. And a screw member for fixing the key member to the bearing base metal. As a result, the positioning of each unit sliding member is facilitated, and replacement work can be facilitated.

According to the present invention, further, a connecting means is provided between the bearing base and each unit sliding member to form a concave and convex portion for positioning each unit sliding member, and each unit sliding member after positioning. It is characterized in that it is constituted by a screw member fixed to a base metal. As a result, each unit sliding member can be replaced completely independently, which facilitates handling such as uneven wear.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. 1 and 2 show a slide bearing of a rotary electric machine according to a first embodiment of the present invention. This slide bearing 1 includes a bearing base metal 2 having a substantially cylindrical shape and a bearing base metal 2 of the bearing base metal 2. A bearing sliding member 4 which is disposed on the inner peripheral portion and rotatably supports the rotary shaft 3 of the rotating electric machine. The bearing sliding member 4 is, for example, six units continuously arranged in the circumferential direction. It is composed of a sliding member 4a.

The bearing base 2 is made of, for example, an iron material such as mild steel or cast iron, and its inner peripheral surface is, for example, two for each unit sliding member 4a, as shown in FIG. The dovetail groove 5 is provided in the ratio.

On the other hand, each of the unit sliding members 4a is formed in a circular arc shape using a low wear material which does not swell with oil and has excellent slidability, and its outer peripheral surface is as shown in FIG. Further, two dovetails 6 which are fitted and locked in the dovetail grooves 5 are provided. By engaging the dovetail groove 5 and the dovetail 6, each unit sliding member 4a is detachably positioned and fixed to the inner peripheral portion of the bearing base metal 2. A polytetrafluoroethylene resin is used as a low-wear material which is a material of each unit sliding member 4a.

As shown in FIG. 2, each of the unit sliding members 4a is also provided with a step 7 at each of the corners on the inner peripheral side at both ends in the circumferential direction. When continuously arranged in the circumferential direction, an axial oil groove 8 is configured by the two adjacent step portions 7. The oil groove 8 allows an oil film 9 to be formed between the rotary shaft 3 and the bearing sliding member 4. The oil groove 8 may have any shape. However, as shown in FIG. 2, it is easy to form the oil film 9 if it has an inverted trapezoidal cross section with a small bottom and a large open end. It is more preferable from the viewpoint.

Next, the operation of the present embodiment will be described. When assembling the slide bearing 1, first, the unit sliding members 4a are arranged at one end of the bearing base 2 in the axial direction, and the dovetail 6 is formed.
Is inserted into the dovetail groove 5 and slid in the axial direction. As a result, the unit sliding members 4a are positioned and fixed in the state shown in FIG. 2, and the bearing sliding member 4 is attached to the inner peripheral portion of the bearing base 2.

By the way, a step portion 7 is provided at each end of the unit sliding members 4a adjacent to each other in the circumferential direction, and an oil groove 8 is formed by these both step portions 7. Therefore, when the rotating shaft 3 rotates, the rotating shaft 3 and the bearing sliding member 4
An oil film 9 is formed between and. At this time, each oil groove 8 has an inverted trapezoidal cross section with a small size on the bottom side and a large size on the open end side. It is possible to easily form a stable oil film 9 by being easily drawn into.

Since the bearing sliding member 4 is mechanically positioned and fixed to the bearing base metal 2 through the dovetail groove 5 and the dovetail 6, however, the bearing sliding member 4 is separated from the bearing base metal 2. There is no. Further, since the bearing sliding member 4 is composed of a plurality of unit sliding members 4a, even if abrasion or uneven wear occurs over time, it can be replaced easily and in a short period of time. Further, since the oil groove 8 is composed of the two adjacent step portions 7, the oil groove 8 can be processed without machining.
Can be formed. In the first embodiment, the bearing sliding member 4 has a plurality of unit sliding members 4a.
Although the case of being divided into two is described, a single structure may be used if necessary.

FIGS. 3 to 5 show a second embodiment of the present invention. Instead of the dovetail groove 5 and the dovetail 6 in the first embodiment, each unit sliding member 4a is provided. The notch 10, the key member 11 attached to the notch 10, and the screw member 12 for fixing the key member 11 to the bearing base 2 are used. That is, as shown in FIGS. 3 and 4, square notches 10 that open in the circumferential direction are provided at both ends of each unit sliding member 4a in the circumferential direction. When the sliding members 4a are continuously arranged in the circumferential direction, a square hole is formed together with the notch 10 of the adjacent unit sliding member 4a. Then, the shaft portion 11b of the key member 11 having a T-shaped cross section is inserted from the head portion 11a and the shaft portion 11b into the rectangular hole, and the edge portion of the rectangular hole has the head portion 11a.
It can be pressed from the inner diameter side by a,
Thereby, the unit sliding members 4a on both sides are simultaneously positioned and supported.

As shown in FIGS. 3 and 5, the key member 11 is provided with, for example, two through holes 13, and the key member 11 is screwed to the bearing base 2 through the through holes 13. The bearing member 2 is fixed by the screw member 12.

In other respects, the configuration is the same as that of the first embodiment, and the operation is the same. Thus, according to the present embodiment, since the unit sliding members 4a on both sides are simultaneously positioned and supported by the single key member 11, the positioning of each unit sliding member 4a becomes easy and the replacement is possible. The work becomes extremely easy.

FIG. 6 shows a third embodiment of the present invention. Instead of the dovetail groove 5 and the dovetail 6 in the first embodiment, a recess 20 is provided in each unit sliding member 4a.
The projection 21 provided on the bearing base 2 and the screw member 22 for fixing each unit sliding member 4a to the bearing base 2 are used. That is, each unit sliding member 4a
As shown in FIG. 6, for example, a square hole-shaped recess 20 is provided in the central portion of the outer peripheral surface of the bearing base metal 2. On the other hand, the inner peripheral surface of the bearing base 2 has a convex portion 21 fitted into the recess 20. Is provided. The unit sliding member 4a is positioned by fitting the concave portion 20 and the convex portion 21. As shown in FIG. 6, insertion holes 23 are provided at both ends of each unit sliding member 4a in the circumferential direction, and each unit sliding member 4a after positioning is provided with the insertion hole 2 described above.
It is adapted to be individually fixed to the bearing base 2 by means of screw members 22 screwed to the bearing base 2 through 3.

In other respects, the configuration is the same as that of the first embodiment, and the operation is the same. Thus, according to the present embodiment, since each unit sliding member 4a is fixed to the bearing base 2 in a state of being completely independent of each other, the specific unit sliding member 4 is caused by uneven wear or the like.
The work is easy when only a needs to be replaced.

[0023]

As described above, according to the present invention, the bearing sliding member is formed of a low-wear material, and the bearing sliding member and the bearing base metal are separate structures, and the bearing sliding member is
Since it is detachably fixed to the bearing base metal by the connecting means, it is possible to prevent separation of the bearing sliding member from the bearing base metal, which has been a problem in the past. Further, when wear occurs over time, only the bearing sliding member can be replaced, and the work can be performed easily and in a short period of time.

According to the present invention, the bearing sliding member is composed of a plurality of unit sliding members arranged in the circumferential direction, and stepped portions are formed at the inner peripheral side corners at both circumferential ends of each unit sliding member. When each unit slide member is arranged in the circumferential direction, the oil groove in the axial direction is formed by the two adjacent step portions, so that it is easier to replace the bearing slide member. In addition, since the oil groove is formed by the stepped portion, machining for forming the oil groove is not required.

Further, according to the present invention, since the connecting means is constituted by the dovetail and the dovetail groove, the bearing sliding member is constituted by a plurality of unit sliding members and is constituted by a single member. Even if it is, it can be easily fixed to the bearing base metal. According to the present invention, the connecting means is provided at both ends in the circumferential direction of each unit sliding member, and the notches that are open in the circumferential direction are provided at the both ends of the unit sliding member. Since the key member and the screw member for fixing the key member to the bearing base are configured, it becomes easy to position each unit sliding member and the replacement work can be facilitated.

In the present invention, the connecting means is provided between the bearing base and each of the unit sliding members, and the concavo-convex portion for positioning each unit sliding member, and each unit sliding member after positioning are bearings. Since it is composed of the screw member fixed to the base metal, each unit sliding member can be replaced completely independently of each other, and handling in case of uneven wear or the like is easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a slide bearing of a rotary electric machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a notch structure of the unit sliding member of FIG.

5 is a perspective view showing the configuration of the key member of FIG.

FIG. 6 is a view corresponding to FIG. 2 showing a third embodiment of the present invention.

[Explanation of symbols]

 1 sliding bearing 2 bearing base metal 3 rotating shaft 4 bearing sliding member 4a unit sliding member 5 dovetail groove 6 dovetail 7 step portion 8 oil groove 9 oil film 10 notch 11 key member 12, 22 screw member 20 recessed portion 21 convex portion

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeo Tanaka, 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Office (72) Inventor, Kei Tatsuya Suehiro, Tsurumi-ku, Yokohama, Kanagawa 2-4, Machi Within the Keihin office of Toshiba Corporation

Claims (5)

[Claims] 1. A sliding bearing of a rotary electric machine, wherein a bearing sliding member that rotatably supports a rotating shaft is provided on an inner peripheral portion of a bearing base metal having a substantially cylindrical shape. The bearing slide member is formed of a low-wear material that does not swell due to the above and has good slidability, and the bearing slide member and the bearing base metal are separate structures, and the bearing slide member is detachably attached by a connecting means. A sliding bearing for a rotating electric machine, characterized by being fixed to. 2. A bearing sliding member is composed of a plurality of unit sliding members arranged in the circumferential direction, and step portions are provided at corners on the inner circumferential side at both circumferential ends of each unit sliding member, respectively.
2. The sliding bearing for a rotary electric machine according to claim 1, wherein when the unit sliding parts are arranged in the circumferential direction, an axial oil groove is formed by two adjacent step parts. 3. The sliding bearing for a rotary electric machine according to claim 1, wherein the connecting means includes a dovetail and a dovetail groove provided between the bearing base metal and the bearing sliding member. 4. The connecting means is provided at both ends in the circumferential direction of each unit sliding member and has notches that are open in the circumferential direction, and is attached to the notches to simultaneously position and support the unit sliding members on both sides. 3. A key member and a screw member for fixing the key member to the bearing base metal.
The sliding bearing of the rotating electric machine described. 5. The connecting means comprises a concavo-convex portion provided between the bearing base metal and each unit slide member for positioning each unit slide member, and each unit slide member after positioning on the bearing base metal. The sliding bearing for a rotary electric machine according to claim 2, further comprising a screw member for fixing.