JPH0136335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a pulley to a small motor used in a tape recorder or the like.

Generally, when attaching a pulley to the rotating shaft of a small motor with an electronic government, the motor M is attached to a predetermined position on the table 30 of a hand press machine, as shown in Figure 1.
, temporarily assemble the pulley P to the motor rotation shaft S, and pull the lever 31 in the direction of arrow D, the punch 32 descends and starts press-fitting, and the stopper 33
It hit the main body 34 and completed the press-fitting.

By the way, in the conventional method, as shown in FIG. 2, a load is applied to the bearing 35 of the rotating shaft S, which may damage the bearing 35, and the dimension A between the motor body and the upper end of the pulley may be damaged due to the deflection of the bearing mounting plate 36. It is possible to achieve an accuracy of only about ±0.3mm,
Also, the dimension B between the motor body and the lower end of the motor is 1
There were drawbacks such as difficulty in reducing the thickness to less than mm.

In view of the above points, the present invention provides a bearing 3 for a motor.
5. To provide a pulley with good dimensional accuracy by press-fitting a pulley without applying a load to the bearing mounting plate 36.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 3 shows a motor pulley mounting jig used in the mounting method of the present invention.In this mounting jig, posts 2 and 3 are press-fitted into a base 1 with screws, and the two posts 2 and 3 are used as guides to move the motor pulley up and down. A sliding plate 4 is set. This slide plate 4
The posts 2 and 3 are guided by two linear motion bearings 5 and 6. Further, a cylinder mounting plate 7 is fixed to the upper ends of the posts 2 and 3 with washers 8 and 9 and screws 10 and 11, and a press-fitting cylinder 12 is fixed to the center of the cylinder mounting plate 7, and the cylinder rod end is connected to the joint 1.
3 to the slide plate 4. A press-fitting punch 14 having a stopper is attached to the central lower surface of the slide plate 4. Note that air is connected to the press-fitting cylinder 12 so that the cylinder 12 is initially pulled upward. The above constitutes the press-fit mechanism section. Next, to explain the motor push-up mechanism, the collars 15 and 16 are sandwiched between the base 1 and the push-up cylinder 17 is screwed onto the same axis as the press-fit cylinder 12 and the press-fit punch 14. The air is connected so that the motor push-up block such as the above is in the lowered state. A motor push-up block 18 is attached to the tip of the rod of the push-up cylinder 17 via an overstroke absorbing spring 19. This push-up block 1
8 is guided by the guide hole of the base 1 and slides up and down. In the shaft chuck mechanism, a stopper 21 is screwed to the base 1 via a spacer block 20. The height of the spacer block 20 is slightly higher than the height of the motor case 22, and the stopper block is attached parallel to the base 1, and the chuck part 23 and punch stopper part 24 of the rotating shaft S of the motor M are
The SKS material is hardened to HRC58°. On the slide side, a cylinder mounting plate 25 is screwed perpendicularly to the base 1, and a shaft chuck cylinder 26 is mounted parallel to this. In the initial state, this cylinder 26 is connected to air so as to be on the drawing side. A shaft chuck 27 is attached to the tip of the cylinder 26 on the same plane and on the same axis as the stopper 21.

Next, the mounting method will be explained with reference to FIGS. 3 and 4. First, a pulley P is assembled on the tip of the rotating shaft S of the motor M and set on the motor pushing block 18. Next, the push-up cylinder rod 17 is moved in the direction of arrow A, and the motor push-up block 1 is compressed while compressing the overstroke absorption spring 19.
8 and push it up until the case 22 of the motor M touches the stopper 21. Next, the shaft chuck cylinder 26 is actuated to move the rod in the direction of arrow B. Therefore, the rod pushes the shaft checker 27, and the rotation shaft S of the motor M is checked by the motor rotation shaft chuck portion 23 of the stopper 21. Next, the press-fitting cylinder 12 operates in the direction of arrow C, and the force is applied to the joint 13 slide plate 4.
, and the punch 14 presses the pulley P. The punch 14 completes press-fitting by hitting the punch stopper 24 of the stopper 21. When the press-fitting cylinder 12 is released after press-fitting is completed, the punch 14 returns to its initial state, and then the shaft chuck cylinder 26 is released to release the chuck on the rotating shaft S of the motor M. Then, the cylinder 17 for pushing up the motor is released, and the motor goes down to complete the entire process.

As mentioned above, the present invention uses a vertically movable table to push the motor up to a predetermined position and fix it, then checks the rotating shaft of the motor, and then press-fits the pulley from above the rotating shaft, unlike the conventional method. This has the advantage of not only having a long life but also being able to provide a product with good dimensional accuracy without damaging the bearing, bearing mounting plate, etc.

[Brief explanation of drawings]

Fig. 1 is a side view of a hand press used for conventional press-fitting, Fig. 2 is a sectional side view of a general motor with an electric government, Figs. 3 and 4 show an embodiment of the present invention, and Fig. The figure is a partially sectional side view of the pulley press-fitting jig before the pulley is attached, and FIG. 4 is a partially sectional side view showing the pulley press-fitting jig in the middle of its operation. M...Motor, S...Rotating shaft, P...Pulley, 18...Table (pushing block).

Claims (1)

[Claims] 1. In a method for attaching a pulley to a rotating shaft of a motor having a rotating shaft, the motor is pushed up and fixed in a predetermined position using a vertically movable table;
A method for attaching a pulley to a small motor, the method comprising: checking the rotating shaft of the motor; and then press-fitting the pulley from above the rotating shaft.