JPH0555758U - Motor bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To improve manufacturability of sintered oil-impregnated bearings while ensuring sufficient lubricity. [Structure] A sintered oil-impregnated bearing for bearing a rotor shaft 1 of an electric motor. The sintered oil-impregnated bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1. As the end side of the divided divided oil-impregnated sintered bearing member 2a in the longitudinal direction in the bearing surface side of the both end portions in the longitudinal direction to form a tapered hole 3 becomes large.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a bearing for an electric motor, and more particularly to a technique for improving the manufacturability of a sintered oil-impregnated bearing while ensuring sufficient lubricity.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 6, the structure of the sintered oil-impregnated bearing for bearing the rotor shaft 1 of the electric motor incorporates and uses the twin metal a as the sintered oil-impregnated bearing 2.

[0003]

[Problems to be solved by the device]

 However, in such a structure, when the rotor shaft 1 rotates, the oil impregnated inside the twin metal a seeps out from the pores due to thermal expansion due to friction, and the oil travels along the rotor shaft 1. Although it tries to jump out to the yoke 4 side, the slinger 5 is pressed into the rotor shaft 1 and rotates together, and it is pushed back to the case side by centrifugal force. Therefore, the oil does not flow out to the yoke 4 side and the lubricity is good. The twin metal a used has good coaxiality, and since there is a space in the center, the sliding contact surface with the rotor shaft 1 is small, so there is an advantage that friction is also small. Since the processing method of the twin metal a is complicated, the cost is high. In other words, as shown in Fig. 7, there is an additional step of cutting the central part of the formed metal and then compressing (buckling) it with a press, so the accuracy is good, but it is expensive. There was a problem of doing so. Further, when a straight sintered oil-impregnated bearing 2 as shown in FIG. 8 is used, the bearing is inexpensive, but the sliding contact surface between the rotor shaft 1 and the sintered oil-impregnated bearing 2 increases, and friction increases. As a result, the load becomes large and the electric current increases, the inner diameter of the sintered oil-impregnated bearing 2 collapses, and abnormal noise occurs.

The present invention is intended to solve such a problem, and an object thereof is to provide a structure of a sintered oil-impregnated bearing for bearing the rotor shaft 1 of an electric motor. The bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1, and the divided sintered oil-impregnated bearing members 2a are divided into a plurality of bearing surfaces on both sides in the length direction, which are larger toward the end portions in the length direction. It is characterized in that a tapered hole 3 having a diameter is formed.

[0005]

[Means for Solving the Problems]

 The present invention has a structure of a sintered oil-impregnated bearing for bearing the rotor shaft 1 of an electric motor, in which the sintered oil-impregnated bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1, and the divided divided sintered pieces are formed. The oil-impregnated bearing member 2a is characterized in that tapered holes 3 are formed on the bearing surface sides at both end portions in the length direction, the taper holes 3 having a larger diameter toward the end portions in the length direction.

[0006]

[Action]

 Thus, the sintered oil-impregnated bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1, and the divided sintered oil-impregnated bearing members 2a are lengthened on the bearing surface side at both ends in the length direction. By forming the tapered hole 3 having a substantially large diameter on the end side in the depth direction, the divided sintered oil-impregnated bearing members 2a that are divided into a plurality of pieces are used in a butted state. An oil sump can be formed between No. 3 and No. 3, and an oil sump can be formed even at the tapered hole 3 at the end in the lengthwise direction, the lubricity of which can be greatly improved, and the rotor shaft 1 and the sintered oil-impregnated bearing 2 By reducing the sliding contact surface with, reducing friction, extending the service life, and simplifying the structure compared to the conventional twin metal, it is not necessary to improve the processing accuracy and productivity can be improved. Can reduce costs In which was to so that.

[0007]

【Example】

 The bearing base 8 is held on the iron core 7 side, and the sintered oil-impregnated bearing 2 is arranged on the inner surface side of the iron core 7. The rotor shaft 1 is rotatably inserted into the sintered oil-impregnated bearing 2 to form a rotor shaft. A yoke 4 is fixed to 1 and a fan blade 9 is fixed to the yoke 4, and the yoke 4 is rotated by energizing the coil 6 to burn the rotor shaft 1 integrated with the yoke 4. The oil-impregnated bearing 2 is rotatably held by lubrication. Although such an electric motor is configured for a fan, it may be implemented in another. In FIG. 1, 5 is a slinger, 10 is a washer, 11 is a grip ring, 12 is a labyrinth, 13 is a cap, and 14 is a case.

The sintered oil-impregnated bearing 2 is divided in the lengthwise direction of the rotor shaft 1, and the divided split sintered oil-impregnated bearing members 2a are provided at both ends in the lengthwise direction with respect to the bearing surface side. A tapered hole 3 having a larger diameter on the part side is formed. Thus, the sintered oil-impregnated bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1, and the divided sintered oil-impregnated bearing members 2a are lengthened on the bearing surface side at both ends in the length direction. By forming the tapered hole 3 having a larger diameter toward the end side in the depth direction, the divided sintered oil-impregnated bearing members 2a divided into a plurality of pieces are used in a butted state, so that at the butted portion. An oil sump is formed between the taper holes 3 and 3, and an oil sump is also formed in the taper hole 3 at the end portion in the length direction, thereby significantly improving the lubricity. Then, in the oil sump, the sliding contact surface between the rotor shaft 1 and the sintered oil-impregnated bearing 2 is reduced, friction is reduced, and the life is extended. Compared with the conventional twin metal, the sleeve-shaped split sintered oil-impregnated bearing member 2a can be used, the structure is simplified, it is not necessary to improve the processing accuracy, the productivity is improved, and the cost is reduced. .

By the way, as shown in FIG. 3, the recessed stepped portions 15 are formed on the bearing base 8 at a plurality of positions, and the split sintered oil-impregnated bearing member 2a is inserted into these recessed stepped portions 15 to form a rotor. It is conceivable to support the shaft 1 in the form of a bearing, but in such a structure, the bearing function for the rotor shaft 1 will deteriorate unless the dimensional accuracy of the plurality of recessed stepped portions 15 is increased.

FIGS. 4 and 5 show a caulking structure of the yoke 4 and the rotor shaft 1, which is a rotor block in which the yoke 4 is caulked to the rotor shaft 1 via a bush 16. Is. In order to stabilize the runout accuracy, the block is assembled by setting it on a pedestal where the runout of the rotor shaft 1 in the direction of the inner diameter d of the yoke 4 in FIG. The mating of the pedestal and the cradle is about 0.01 mm. In such a case, the clearance between the yoke 4 and the rotor shaft 1 is 0.1 mm, and the deviation of the yoke 4 with respect to the rotor shaft 1 at the inner diameter d is 0.05 to 0.1 mm due to variation. However, it can be corrected as a rotor block and the runout accuracy will be good. In terms of strength, as shown in FIG. 5B, a notch 17 is formed in the caulking portion of the yoke 4, and the caulking portion (rotor shaft 1) is made to bite into the notch 17 during caulking, so that the rotor shaft 1 It is designed to prevent the idling of the car. The bush 16 interposed between the yoke 4 and the rotor shaft 1 can be crimped even if it is a molded product without biting into the edge e of the rotor shaft 1. If the bush 16 is not provided, the cost can be reduced by that amount, but since the yoke 4 receiving surface of the rotor shaft 1 can receive only a very small area, the swing of the top surface of the yoke 4 relative to the rotor shaft 1 is not stable. Therefore, the bush 16 cannot be removed.

[0011]

[Effect of the device]

 According to the present invention, as described above, the sintered oil-impregnated bearing is divided into a plurality of parts in the length direction of the rotor shaft, and the divided sintered oil-impregnated bearing members are provided on the bearing surface side at both ends in the length direction. Since a tapered hole with a larger diameter is formed toward the end side in the length direction, by using a plurality of divided sintered oil-impregnated bearing members in abutting state, the tapered hole is formed at the abutting point. Between the rotor shaft and the sintered oil-impregnated bearing, the oil pool can be formed between the rotor shaft and the sintered oil-impregnated bearing. It is possible to reduce the friction, reduce the friction, extend the life, simplify the structure compared to the conventional twin metal, eliminate the need to improve the processing accuracy, improve the productivity, and reduce the cost. There are advantages.

[Submission date] August 3, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Action]

Thus, the sintered oil-impregnated bearing 2 is divided into a plurality of pieces in the length direction of the rotor shaft 1, and the divided sintered oil-impregnated bearing members 2a are lengthened on the bearing surface side at both ends in the length direction. By forming the tapered hole 3 having a larger diameter on the end side in the depth direction, the divided sintered oil-impregnated bearing members 2a that are divided into a plurality of pieces are used in a butted state. An oil sump can be formed between No. 3 and No. 3, and an oil sump can be formed even at the tapered hole 3 at the end in the lengthwise direction, the lubricity of which can be greatly improved, and the rotor shaft 1 and the sintered oil-impregnated bearing 2 By reducing the sliding contact surface with, reducing friction, extending the service life, and simplifying the structure compared to the conventional twin metal, it is not necessary to improve the processing accuracy and productivity can be improved. Can reduce costs In which was to so that.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

Example: An iron core 7 is inserted into and held by a bearing base 8, a sintered oil-impregnated bearing 2 is disposed on the inner surface side of the iron core 7, and the rotor shaft 1 is rotatably inserted into the sintered oil-impregnated bearing 2. is, the rotor shaft 1 yaw click 4 is fixed to the yoke 4 fan blades 9 are fixed, Thus, by rotating the yoke 4 at the energization of the coil 6, integrated with the yoke 4 The rotor shaft 1 is lubricated by a sintered oil-impregnated bearing 2 and is rotatably held. Although such an electric motor is configured for a fan, it may be implemented in another. In FIG. 1, 5 is a slinger, 10 is a washer, 11 is a grip ring, 12 is a labyrinth, 13 is a cap, and 14 is a case.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

2A and 2B show a split sintered oil-impregnated bearing member, wherein FIG. 2A is a sectional view and FIG. 2B is a plan view.

FIG. 3 is a cross-sectional view of a comparative example of the above.

FIG. 4 is a cross-sectional view showing a fastening structure between a rotor shaft and a bush of the same.

5A is a partial cross-sectional view of the above, and FIG. 5B is a partial plan view.

FIG. 6 is a sectional view of a conventional example.

FIG. 7 shows a process of manufacturing the above twin metal,
(A) thru | or (c) are schematic sectional drawing, (d) is a detailed sectional view.

FIG. 8 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 1 Rotor shaft 2 Sintered oil-impregnated bearing 2a Split sintered oil-impregnated bearing member 3 Tapered hole

[Procedure amendment]

[Submission date] August 3, 1992

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (1)

[Scope of utility model registration request] 1. A structure of a sintered oil-impregnated bearing for bearing a rotor shaft of an electric motor, wherein the sintered oil-impregnated bearing is divided into a plurality in the length direction of the rotor shaft, and the divided divided oil-impregnated bearing is divided. A bearing for an electric motor, in which tapered holes are formed on the bearing surface side at both ends in the length direction of the member, the tapered holes having a larger diameter toward the end side in the length direction.