JPH063210B2 - Thrust washer structure of motor shaft bearing and method of assembling thrust washer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thrust washer structure for a motor shaft bearing portion of a fan motor and the like and a method for assembling the thrust washer.

[Problems to be Solved by Prior Art and Invention] In general, when a fan is attached to a motor shaft, a plurality of thrust washers are attached to the front and rear of a bearing portion.

By the way, such a thrust washer needs to have a slip adjusting function for alleviating the sliding resistance of the end surface of the bearing portion, and therefore the washers need to freely rotate with respect to each other. However, the thrust washer is generally formed by stamping a hard thin plate material such as an iron plate.At this time, a burr is generated on the punching end face, and this burr interferes with an adjacent thrust washer to allow free rotation. It will bother you. Therefore, it is necessary to carefully deburr the burrs formed on the through hole and the outer peripheral edge of the motor shaft. For deburring the through hole, the through hole is formed in a large thin plate material. Since it can be done in a closed state, workability is hardly impaired, but for deburring the outer periphery, it is necessary to perform it for each individual punched from the thin plate material, which is troublesome and complicated, resulting in remarkable workability. In addition, when the deburring is insufficient, it is a factor causing problems such as abnormal wear of the bearing portion and generation of abnormal noise.

[Means for Solving the Problem] The present invention has been made in view of the above circumstances and was devised with the object of providing a thrust washer structure for a motor shaft bearing portion and a method for assembling the thrust washer to eliminate these drawbacks. According to the first aspect of the present invention, when the plurality of thrust washers are laminated and fitted and assembled on the bearing portion of the motor shaft so as to freely rotate with each other, each thrust washer has a through hole for the motor shaft. It is assumed that the thin plate material formed in the deburring state is punched into the motor shaft one after another, and the outer diameter of these thrust washers is as large as the one fitted and fitted in advance. It is assumed that the diameters of the thrust washers are gradually set so that the diameter becomes smaller as much as possible.In addition, all thrust washers are aligned and maintained while maintaining the punching posture punched from the thin plate material. Assuming that the burrs projecting to the punching die side of the outer peripheral edge of each of the incorporated thrust washers as fitted to the data shaft are directed toward the adjacent small diameter thrust washer to be subsequently incorporated. It is characterized by being configured in.

Further, in the second invention, when a plurality of thrust washers are fitted and assembled to the motor shaft in a laminated manner, each thrust washer is stamped from a thin plate material in which the through hole of the motor shaft is formed in a deburring state. Shall be sequentially fitted and incorporated into the motor shaft.In that case, the preceding thrust washer fitted and assembled in advance shall fit the one punched from the thin plate material to the motor shaft while maintaining its punching posture. The succeeding thrust washer that is assembled and fitted next to the preceding thrust washer is set so that the outer diameter is smaller than that of the preceding thrust washer, and the punching posture is maintained for the one punched from the thin plate material. The thrust washer outer peripheral edge of each of the assembled thrust washers is aligned by aligning all the directions of the motor shafts of the plurality of thrust washers so that the thrust washers are fitted into the motor shaft as they are. Projecting direction of burrs projecting punching mold side and it is characterized by being configured to face the adjacent thrust washer side of a small diameter which is subsequent integration.

Further, according to the present invention, even if a burr is left on the outer peripheral edge of the thrust washer, the present invention can be fitted and assembled into the motor shaft without any problem.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a fan motor, and a motor shaft 2 of the fan motor 1 is rotatably supported at its front and rear end portions by a bearing metal 3 on a casing 4, and has a tip portion protruding from the casing 4. The fan 5 is integrally mounted on the shaft.

A plurality of thrust washers 6 (three in the embodiment) are attached to both front and rear sides of the bearing metal 3 in the axial direction, and these thrust washers 6 are formed by punching from a thin plate material 7 as described later. However, the closer to the fan 5, the outer diameter is set to be smaller step by step, and the protrusion direction of the burrs 6a remaining on the outer peripheral edge of each thrust washer 6 is smaller than the adjacent thrust washer 6 side. The burrs 6a are sequentially fitted and assembled in a state in which they are aligned so as to face each other, so that the burrs 6a remaining on the outer peripheral edge do not interfere with the adjacent thrust washers 6.

Next, a procedure for incorporating the thrust washer 6 into the motor shaft 2 will be described. In this product, in the first step, the through hole 7a for the motor shaft 2 is punched out in the thin plate material 7 by the die 8, and at this time, a burr formed to protrude to the die 8 side is formed on the inner peripheral edge. Remove by buffing and then
The outer peripheral edge of the preceding first thrust washer 6 is punched out (cut down) by the die 8, and the punched first thrust washer 6 is left on the outer peripheral edge with a burr 6a protruding toward the die 8 side. In this state, the punching posture is maintained and the motor shaft 2 is fitted and incorporated. Then, in each of the second and third steps, the subsequent second and third thrust washers 6 are punched out from the thin plate material 7 in the same manner as the first thrust washer 6 and fitted into the motor shaft 2. In this case, the trailing second and third thrust washers 6 are sequentially set stepwise so that their outer diameters are smaller than those of the preceding thrust washers 6, and are respectively punched from the thin plate material 7. Each thrust washer 6 is sequentially fitted and assembled while maintaining the punching posture as it is, and thus the three thrust washers 6 are the first thrust washer 6 the most. Larger diameters are set so that the diameters of the second and third steps are smaller, and the protrusions of the burrs 6a on the die 8 side are all evenly aligned so as to face the adjacent small diameter thrust washer side. Built direction of the motor shaft 2 is set to be made in state.

In the embodiment of the present invention configured as described above, when a plurality of thrust washers 6 are fitted and incorporated in the motor shaft 2 in a laminated manner, as described above, each thrust washer 6 is inserted.
Is such that, even if it is punched from the thin plate material 7 and burrs are left on the outer peripheral edge, the outer diameter becomes larger as it is fitted and assembled in advance, and becomes smaller as it follows. Moreover, each thrust washer 6 is fitted and incorporated in the motor shaft 2 in a state where the punching posture is maintained as it is, whereby each thrust washer 6 has a burr 6a left on the outer peripheral edge. , All of them are projected toward the side of the adjacent small diameter washer 6 and, as a result,
The burrs 6a are surely prevented from interfering with each other between the thrust washers 6, and even the thrust washers 6 with the burrs 6a remaining on the outer peripheral edge do not cause any obstacles. The mutual rotation of each other allows the sliding resistance to be reduced.

As described above, according to the present invention, a plurality of thrust washers 6 are assembled in a laminated form. In this case, even if there is a burr 6a remaining on the outer peripheral edge of each thrust washer 6, there is no problem, and therefore, it is possible to use a conventional method. In addition, it is not necessary to remove the burrs 6a remaining on the outer peripheral edge of the thrust washer 6 at all, which greatly simplifies the working process. It can also be automated so that the process of
Significant labor saving can be achieved and it can contribute to cost reduction.

In carrying out the present invention, in the thrust washers that are stacked next to each other, the diameter of the leading thrust washer is set to be larger and the diameter of the trailing thrust washer is set to be smaller. It is sufficient that the directions are all aligned so that the punching posture by the die is maintained as it is, and all burrs remaining on the outer peripheral edge face the adjacent thrust washer side of the small diameter. It is not necessary to assemble all the thrust washers 5 on both sides so that the diameter becomes smaller toward the tip of the motor shaft, and vice versa (Fig. 3A), or the bearing metal 3 side is set to have a smaller diameter (Fig. 3). B),
It goes without saying that, on the contrary, the diameter may be set to be large (FIG. 3C).

[Effects] In summary, since the present invention is configured as described above, a plurality of thrust washers that are fitted and incorporated in the motor shaft in a laminated manner are punched from a thin plate material and have burrs on the outer peripheral edge. Even if the thrust washer is left as it is, the outer diameter of the thrust washer is set so that it is larger as it is fitted and assembled in advance, and smaller as it is on the trailing side. , Are all aligned in a state where the punching posture by the die is maintained as they are, and are sequentially fitted and incorporated into the motor shaft.

As a result, in each of the thrust washers that have been fitted and assembled, the burrs that remain on the outer peripheral edge of the thrust washers all project toward the adjacent small diameter thrust washer side, and the effective burr escape space is reduced to the adjacent small diameter washer. It is effectively secured on the outer diameter side of the outer peripheral edge of the thrust washer. Therefore, even if a burr is left on the outer peripheral edge of each thrust washer, the remaining burr interferes with the adjacent thrust washer and the thrust washers freely rotate. Since there is no problem that interferes with the above, the sliding resistance can be sufficiently reduced even if a punched product that is not deburred is fitted and incorporated.

Moreover, in this product, it is possible to incorporate multiple thrust washers into the motor shaft one after another, without punching each punched product, while maintaining the punched posture as it is. It is possible to continuously automate punching and fitting of a plurality of thrust washers, resulting in significant labor saving and providing a highly reliable motor at low cost.

[Brief description of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a sectional view of an essential part, FIG. 2 is an operation explanatory view showing an assembling process of a thrust washer into a motor shaft, and FIG. 3A, 9B and 9C are enlarged main-part sectional views showing another embodiment. In the figure, 2 is a motor shaft, 3 is bearing metal, 5 is a fan, and 6
Is a thrust washer, 6a is a burr, 7 is a thin plate material, and 8 is a mold.

Claims (2)

[Claims] 1. When assembling and assembling a plurality of thrust washers so as to freely rotate with respect to each other on a bearing portion of a motor shaft, each thrust washer has a through hole of a motor shaft deburred. It is assumed that the formed thin plate material is punched into the motor shaft one after another, and the outer diameter of these thrust washers is larger as it is fitted and assembled earlier, and smaller as it follows. It is assumed that the thrust washers are all set in such a manner that the thrust washers are fitted and assembled into the motor shaft while maintaining the punching posture punched from the thin plate material. It is characterized in that the protruding direction of the burr projecting to the punching die side of the outer peripheral edge of the incorporated thrust washer is directed to the adjacent thrust washer of a small diameter to be subsequently incorporated. Thrust washer structure of the motor shaft bearing portion. 2. When a plurality of thrust washers are fitted and incorporated into a motor shaft in a laminated manner, the thrust washers are punched from a thin plate material formed by deburring a through hole of the motor shaft. It is assumed that they are sequentially fitted and incorporated into the shaft, and in that case, the preceding thrust washer that is fitted and incorporated in advance inserts and punches the thin plate material punched into the motor shaft while maintaining its punching posture. ,
The subsequent thrust washer that is fitted and assembled next to the preceding thrust washer is set so that the outer diameter is smaller than that of the preceding thrust washer, and is punched from a thin plate material to the motor shaft while maintaining its punching posture. All the plurality of thrust washers are assembled in the same direction as the motor shafts so that the thrust lashers protrude toward the punching die of the outer peripheral edge of each of the assembled thrust washers. A method for assembling a thrust washer in a motor shaft bearing, wherein the thrust washer is configured to face the adjacent small diameter washer.