JPS6219071Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an end play adjustment device for a sliding bearing.

Sliding bearings are widely used in various mechanical devices including rotating electric machines, and will be explained below using rotating electric machines as an example. When a rotating electric machine is directly connected to a driving partner machine, the rotor is designed so that it can move freely to the load side and the counter-load side in order to prevent the sliding bearings of the rotating electric machine from receiving the thrust force generated by the other machine. This moving distance is called the end play, and the end play is usually larger than the end play of the mating machine being driven. Furthermore, as mentioned above, the thrust force received by the sliding bearing of the rotating electric machine is not the thrust force of the drive machine, but only the thrust force generated by the movement of the rotor, and is generally several kilograms.

The center of end play in a rotating electric machine is the magnetic center generated between the stator core and rotor core, and this does not necessarily coincide with the center of mechanical end play due to assembly errors and the like. For this reason, in order to match the magnetic center with the mechanical center, after the rotating electric machine is assembled, it is actually rotated to find the magnetic center, and the mechanical end play is adjusted accordingly.

An example of a conventional end play adjustment device is described with reference to FIGS. 1 and 2. A rotor shaft 12 to which a rotor core 11 is fixed is supported by bearing metals 13 and 14 on the load side and the counter-load side. . Therefore, the rotor shaft 12 has stepped portions on both sides of the bearing metal 13 on the load side, and the movement between the stepped portion and the side surface of the bearing metal 13 is end play, and the movement between the stepped portion and the side surface of the bearing metal 13 on the opposite load side The end play adjustment device is not configured. FIG. 2 is a detailed view of the load side bearing, showing the shoulder 12 of the rotor shaft 12.
The gap between A and the thrust part 13A of the bearing metal 13 is the end play.

In order to maintain and cope with the end play δ, an adjustment plate 16 is inserted into the gap between the bearing metal 13 and the bearing bracket 15 that supports it in accordance with the value of the end play δ. In such a structure, since the adjustment plate 16 is inserted, the bearing bracket 15 must be divided into two parts, and each time the end play δ is adjusted, the assembled bearing section must be disassembled, which increases the number of assembly steps and increases the product cost. Was. Furthermore, the amount of end play δ is constant, and if this is to be changed, it is necessary to rework the stepped portion of the rotor shaft 12 or the thrust pad surface 13A of the bearing metal 13, and it is only possible to increase the end play δ. It was impossible to make it smaller.

The present invention eliminates such drawbacks, and its purpose is to make it possible to easily adjust the amount of end play without disassembling the assembled rotating electric machine, even though it has an extremely simple structure, and to allow rework even after assembly. An object of the present invention is to provide an end play adjusting device for a sliding bearing that allows changing the amount of end play without changing the amount of end play.

The details of the present invention will be explained below with reference to FIGS. 3 to 5, which are one embodiment. The rotor shaft 21 to which the rotor core 11 is fixed is supported by a load side bearing metal (hereinafter referred to as bearing metal) 22 and an anti-load side bearing metal (hereinafter referred to as bearing metal) 23 held by a bearing bracket 15. . Shoulder portion 21A of rotor shaft 21 and bearing metals 22 and 23
As shown in FIG. 4, the thrust pads 22A and 23A on one side are each configured to have an end play δ. Figure 4 is a detailed enlarged view of the load side bearing section in Figure 3.
The bearing section on the opposite load side has the same structure as shown in FIG. 4, except that the left and right directions are opposite. A bearing metal 22 is provided on the rotor shaft 21 so as to be movable in the axial direction, and a flange 22B is formed in the circumferential direction on the opposite side of the bearing metal 22 to the thrust part. screw 26
through the bearing bracket 1 so that it can rotate freely.
5 and is screwed together. Said adjustment screw 26
has a rotation scale 27 on the peripheral surface of the head, a hexagonal hole (not shown), for example, on the end surface of the head, and grooves (not shown) near both sides of the flange 22B. Retaining rings 24 and 25 are provided in the groove of the adjusting screw 26, so that the adjusting screw 26 is rotatable and prevented from moving in the axial direction.

Next, the operation of the present invention will be explained. Adjustment of the end play of a rotating electrical machine is carried out by determining the magnetic center through a rotation test, but when assembling the rotating electrical machine, initial settings are made based on the end play center based on mechanical dimensions. Assuming that the magnetic center determined by the subsequent rotation test was displaced toward the load side, when the adjustment screw 26 of the bearing metal 22 is first loosened, the bearing metal 22 moves to the right. Next, if the adjustment screw 26 of the bearing metal 23 is tightened by the same amount as the load side and the rotation scale 27, the bearing metal 23 will also move to the right. The magnetic center of the rotating electric machine is aligned with the center of mechanical end play, but if you want to increase the amount of end play, set the adjusting screws 26 on the load side and anti-load side to the same rotation scale 27. Just loosen the amount. Furthermore, since the amount of rotation of the rotation scale 27 and the amount of change in the end play δ are constant, the center position and amount of the end play can be adjusted as desired.

As mentioned above, the sliding bearing end play adjusting device according to the present invention is configured so that the bearing metal can be moved in the axial direction using the adjusting screw.
The gap between the thrust pad surfaces of the pair of bearing metals and the stepped portion of the rotor shaft can now be adjusted freely. Therefore, the position and amount of the end play can be adjusted arbitrarily even after assembly. Furthermore, even if the amount of end play changes by changing the driving machine, it can be easily adjusted by readjusting the adjustment screw. Furthermore, since the bearing metal is moved in the axial direction using the adjustment screw, there is no need to divide the bearing bracket into two parts, and there is no need to disassemble and reassemble the bearing bracket when adjusting the end play, reducing assembly time. The present invention has many advantages.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example, Figure 1 is a sectional view, Figure 2 is an enlarged view of the load side bearing part in Figure 1,
Figures 3 to 5 show one embodiment of the present invention, Figure 3 is a cross-sectional view, Figure 4 is an enlarged view of the load side bearing part in Figure 3, and Figure 5 is an enlarged view of the main part of Figure 4. It is a diagram. 15...Bearing bracket, 21...Rotor shaft,
21A...Stepped portion, 22, 23...Bearing metal, 2
2A, 23A...Thrust parts, 24, 25...
... Retaining ring, 26 ... Adjustable screw, 27 ... Rotation scale.

Claims (1)

[Scope of utility model registration request] A rotor shaft is fixed to the rotor core and has a pair of stepped portions that become smaller in diameter toward the outside, and the thrust parts of the rotor shaft face both stepped portions and are slidably supported, and are arranged in a circumferential direction. a pair of bearing metals each having a flange thereon; a pair of bearing brackets on which both of the bearing metals are respectively supported and fixed to a fixed portion; A square hole addition/reduction screw is screwed through the bracket, and a groove is provided on the circumferential surface of the adjustment screw on both sides of the flange of the bearing metal to prevent the adjustment screw from moving in the axial direction and to allow rotation. A slide bearing end play adjustment device consisting of a retaining ring and a retaining ring.