JPH01242814A - Structure of thrust washer for motor shaft bearing portion and method for assembling thrust washer - Google Patents

Abstract

PURPOSE:To improve efficiency and reliability by setting up respective thrust washers on outer diameter so as to gradually become a smaller diameter from a larger diameter in order, and assembling so as to face burr formed on outer periphery of the thrust washer to the neighboring smaller diameter thrust washer side. CONSTITUTION:Thrust washers 6 are set up so as to the smaller on outer diame ter, the closer to a fan 5, and assembled so as to face burr 6a being on outer peripheral portion of the thrust washer 6 to the smaller diameter thrust washer 6 side. Recessing space for the burr 6a is effectively secured thereby, so noncon formity that the burr 6a interferes with the neighboring thrust washer 6 for being disturbed mutual free turning disappears. Therefore, troublesome deburring process on outer peripheral edge becomes completely needless, and it can be attempted to promote efficiency remarkably while reliability can be improved broadly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust washer structure for a motor shaft bearing portion of a fan motor, etc., and a method for assembling the thrust washer.

[Prior art and problems to be solved by the invention] Generally,
When a fan is attached to a motor shaft, a plurality of thrust washers are stacked and attached to the front and rear of the bearing. By the way, since this thrust washer needs to have a slip adjustment function for alleviating the sliding resistance of the end face of the bearing, the washers need to be able to rotate freely relative to each other. However, thrust washers are generally formed by punching a hard thin plate material, and at this time, burrs are generated on the punched end face, and these burrs interfere with the adjacent thrust washers and impede free rotation. A detailed deburring process is required, which significantly reduces work efficiency and, if deburring is insufficient, causes problems such as abnormal wear of the bearing and generation of abnormal noise.

[Means to solve problems]

The present invention has been devised in view of the above-mentioned circumstances with the aim of providing a thrust washer structure for a motor shaft bearing and a method for assembling the thrust washer that eliminates these drawbacks. In the invention, when a plurality of thrust washers are stacked and assembled on the bearing part of the motor shaft so that they can rotate freely relative to each other, the outer diameter of each thrust washer is
The thrust washer is characterized in that it is set in stages from a large diameter to a small diameter, and is assembled so that the burr formed on the outer periphery of the thrust washer faces toward the adjacent small diameter thrust washer.

In addition, in the second invention, in order to assemble a plurality of thrust washers in a stacked manner on a motor shaft, first, a first thrust washer is punched out from a thin plate and fitted onto the motor shaft, and then the next thrust washer adjacent to this is punched out. The outer diameter of the first thrust washer is set to be smaller than that of the first thrust washer, and the first thrust washer is punched out from a thin plate and fitted onto the motor shaft, so that the firmness produced by the punching is directed toward the adjacent small-diameter thrust washer. It is characterized by being continuously incorporated.

With this configuration, the present invention enables the thrust washer to be assembled as is without being burred.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings. In the drawing, ■ is a fan motor, and a motor shaft 2 of the fan motor 1 is rotatably supported by a casing 4 at its front and rear ends by a bearing metal 3. A fan 5 is integrally attached to the shaft.

Reference numeral 6 denotes a plurality of thrust washers (three in each case) attached to both the front and back sides of the bearing metal 3 in the axial direction. The burr 6a on the outer periphery of the thrust washer 6 is assembled so as to face the small-diameter thrust washer 6, and an escape space is formed so that the burr 6a does not interfere with the adjacent thrust washer 6. has been done.

Next, a procedure for assembling the thrust washer 6 into the motor shaft 2 will be explained. In this first process, a through hole 7a for the motor shaft 2 is punched out in a thin plate 7, and the stiffness formed on the inner peripheral edge at this time is removed by a huffing operation, and then the thrust washer 6 is The outer peripheral edge is punched out, and the punched out thrust washer 6 is fitted onto the motor shaft 2 as it is. Next, in each of the second and third steps, the thrust washers 6 are punched and fitted in the same manner, thereby continuously assembling the thrust washers 6. However, in each of these steps, when the thrust washers 6 are punched out,
A burr 6a is formed on the outer peripheral edge of the thrust washer 6 on the mold 8 side. Therefore, when three thrust washers 6 are stacked, the thrust washers 6 in the first step are set to have the largest diameter, and the diameters of the thrust washers 6 in the second and third steps become smaller.

In the embodiment of the present invention configured as described above, when a plurality of thrust washers 6 are assembled in a stacked manner on the motor shaft 2, the thrust washer 6 on the side where the burr 6a is located has a small diameter, and the burr 6a is Interference is reliably avoided, and therefore, even if the thrust washers 6 have burrs 6a on their outer peripheries, they do not pose any problem, and the thrust washers 6 can freely rotate and slide against each other. Designed to reduce dynamic resistance.

As described above, in the present invention, a plurality of thrust washers 6 are assembled in a stacked manner, but in this case, the outer diameter of the thrust washer 6 adjacent to the protruding side of the burr 6a on the outer periphery of the thrust washer 6 is smaller. Therefore, there is no need to remove the burr 6a formed on the outer periphery of the punched thrust washer 6 as in the conventional method, which simplifies the work process and eliminates the thrust The assembly of the washer 6 can be automated as the first, second, and third steps described above, resulting in significant labor savings and contributing to cost reduction.

In carrying out the present invention, it is sufficient that the burr protruding side of the outer periphery of adjacent thrust washers faces toward the smaller diameter thrust washer, and therefore, as in the above embodiment, the diameter becomes smaller toward the fan 5 side. There is no need to assemble it as shown in Figure 3 (A), or the bearing metal 3
Needless to say, the diameter may be set to be smaller toward the side (FIG. 3B), or conversely, the diameter may be set to be larger toward the side (FIG. 3C).

[Effect]

In summary, since the present invention is constructed as described above, the bulge on the outer peripheral edge of the thrust washer faces toward the adjacent thrust washer on the small diameter side, so that the bulge escape space is effectively secured. This eliminates the problem of burrs interfering with adjacent thrust washers and interfering with mutual free rotation, even if the burrs are not deburred one by one as in the past. This eliminates the need for a complete process, resulting in a significant increase in efficiency and a significant improvement in reliability.

Therefore, if the thrust washer installation is configured to be performed continuously as in the second claim, the installation process of the thrust washer can be extremely labor-saving and automated, resulting in improved reliability. This means that high-performance motors can be provided in large quantities at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a sectional view of the main part, Fig. 2 is an explanatory diagram showing the process of assembling the thrust washer to the motor shaft, and Fig. 3A, B and C are enlarged sectional views of essential parts showing other embodiments. In the figure, 2 is the motor shaft, 3 is the bearing metal, 5 is the fan, and 6
is a thrust washer, 6a is a stiffener, and 7 is a thin plate material. Figure 1 A B

Claims (2)

[Claims] (1) When assembling multiple thrust washers in a stacked manner so that they can rotate freely relative to each other on the bearing of the motor shaft, the outer diameter of each thrust washer is adjusted in stages from the largest diameter to the smallest diameter. A thrust washer structure for a motor shaft bearing portion, characterized in that the burr formed on the outer periphery of the thrust washer is installed so as to face an adjacent thrust washer having a smaller diameter. (2) To assemble a plurality of thrust washers in a stack on the motor shaft, first punch out a first thrust washer from a thin plate and fit it onto the motor shaft, and then insert the next thrust washer adjacent to it into the The outer diameter of the thrust washer is set to be smaller than that of the first thrust washer, and the outer diameter is set to be smaller than that of the other thrust washer.Then, the outer diameter of the thrust washer is set to be smaller than that of the first thrust washer, and the outer diameter is set to be smaller than that of the other thrust washer. A method for assembling a thrust washer in a motor shaft bearing, characterized in that the thrust washer is assembled into a motor shaft bearing.