JP2964176B2 - Preloading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preload applying device for automatically applying a preload to a fitting object fitted to a fitting object.

[0002]

2. Description of the Related Art When a ball bearing is fitted to a rotating shaft of a motor and fixed by an adhesive, a constant pressure is continuously applied to the ball bearing until the adhesive is hardened. Has been performed. If the pressure at the time of fitting the ball bearing to the rotary shaft is continued to be applied even when the preload is applied, the preload to be applied becomes excessively large. Therefore, conventionally, the preload is applied by manually adjusting the pressure by an operator.

[0003] However, appropriate manual adjustment requires the skill of an operator, and if an attempt is made to apply a preload using another device after fitting, the adhesive must be applied to the other device. Curing can cause inconvenience. The present invention has been made in view of the above-described problems in the related art, and an object thereof is to fit a fitting object to a fitting object under pressure, and to fit the fitting object under pressure. An object of the present invention is to provide a preload applying device capable of continuously and automatically applying a preload smaller than a fitting pressure to a fitting after fitting.

[0004]

In order to achieve the above object, a preloading device according to the present invention comprises a vertically moving part, a driving means for driving the vertically moving part up and down, and a compression elasticity. A fitting member supported by the vertically moving portion via a means, and a fitting object under the pressure of the own weight of the fitting member and the elastic compressive force within a predetermined range by the elastic means by lowering the vertically moving portion. After fitting the object to the fitting, the elastic compressive force by the elastic means is almost released, and the vertical moving part is raised so that only the pressure due to the own weight of the fitting member reaches the fitting, And control means for controlling the driving means to hold the position.

[0005]

First, the driving means lowers the vertical moving part under the control of the control means, and the elastic compressive force and the fitting force within a predetermined range generated by the contraction of the elastic means interposed between the fitting member and the vertical moving part. The fitting is fitted to the fitting under pressure due to the weight of the member.

After the fitting, the driving means raises the up-and-down moving part under the control of the control means and releases the contracted state of the elastic means, whereby the elastic compressive force exerted on the fitting by the elastic means almost disappears. . Then, almost only the pressure due to the own weight of the fitting member reaches the fitting. Therefore, a predetermined preload corresponding to the weight of the fitting member can be applied to the fitting.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. Each of the drawings relates to a preloading device as one embodiment of the present invention, in which FIG. 1 is a sectional view of the entire crushing device, and FIGS. 2 to 5 are cross-sectional views of main parts showing respective steps of preloading. is there.

[0010] Reference numeral 10 denotes a frame, and 12 denotes a guide column supported upright by the frame 10. Reference numeral 14 denotes a pneumatic cylinder device (drive unit) with a brake fixed to the frame 10 and provided with a direction control valve. The connecting plate 1 is provided at the upper end of the rod 16 of the pneumatic cylinder device 14.
The slider 20 and the holding member 22 inserted into the guide column 12 are fixed by the connecting plate 18.
(A vertically moving portion) is connected to the rod 16.

The holding member 22 includes a top plate 24 and a cylindrical portion 26. The upper part of the fitting member 28 is fitted inside the tubular portion 26 in a vertically slidable manner. The enlarged diameter portion 30 provided at the upper end of the fitting member 28 is located at the upper large diameter portion 32 in the tubular portion 26, and the annular lower surface of the enlarged diameter portion 30 is formed by the annular upper surface of the upper large diameter portion 32. By being supported, the fitting member 28 is prevented from falling. A compression coil spring 34 (elastic means) is provided between the lower surface of the top plate 24 and the upper end surface of the fitting member 28. It is not always necessary that the upper and lower ends of the compression coil spring 34 are fixed. If the compression coil spring 34 is compressed to generate an elastic compression force when the distance between the top plate 24 and the fitting member 28 is reduced, the compression coil spring 34
May be free at one or both ends. As the elastic means, any means other than a coil spring can be used as long as the elastic means has compression elasticity.

The lower portion of the fitting member 28 is inserted into a guide ring 36 fixed to the frame 10, and is guided to be vertically movable. 38 is a base 10a of the frame 10
The jig supported above and the reference numeral 40 indicated by a two-dot chain line is a spindle motor in which the rotor hub 42 is fitted and supported in the fitting concave portion 44 of the jig 38.

Reference numeral 46 denotes a control device. This control device 46
Inputs a signal indicating the position of the fitting member 28 detected by a position sensor (not shown) provided on the guide ring 36, and in accordance with the position signal, inputs a signal from the direction switching valve and the pneumatic cylinder device 14; The brakes are to be controlled.

The cup-shaped rotor hub 42 opens upward in the figure. Reference numeral 48 denotes a rotating shaft protruding upward at the center of the rotor hub 42. The lower part of the rotating shaft 48 is formed in the large diameter part 50 and the upper part is formed in the small diameter part 52.
A cylindrical rotor yoke 54 is fixed on the outer peripheral extension 42 a of the rotor hub 42, and a rotor magnet 56 is fixed inside the rotor yoke 54.

Reference numeral 58 denotes a bush assembly. A stator core 62 is fixed to an outer peripheral portion of the cylindrical bush 60, and a stator coil 64 is wound around the stator core 62. An outer ring 70 of an upper ball bearing 68 and an outer ring 74 of a lower ball bearing 72 are adhesively fixed above and below an inner peripheral extension 66 located in the middle of the bush 60 in the figure. The lower surface of the outer ring 70 of the upper ball bearing 68 in the figure contacts the upper surface of the inner peripheral extension 66, and the outer ring 74 of the lower ball bearing 72.
The upper surface is in contact with the lower surface of the inner peripheral extension 66.

As shown in FIG. 1, a pneumatic cylinder device 1
In a state where the fourth rod 16 is located at the upper end of the stroke and the holding member 22 and the fitting member 28 are located at the upper end, as shown in FIG. The rotor hub 4 to which the rotating shaft 48, the rotor yoke 54, and the rotor magnet 56 are attached.
2 is fitted and supported in the fitting concave portion 44 of the jig 38. The large-diameter portion 50 and the small-diameter portion 5 of the rotary shaft 48 (the object to be fitted)
After applying the anaerobic adhesive 76 to the outer peripheral surface of each of 2,
As shown in FIG. 3, the bush assembly 58 (fitting object) is concentrically and shallowly fitted on the rotating shaft 48.

Next, a signal for lowering the rod 16 is sent from the control device 46 to the direction switching valve of the pneumatic cylinder device 14. Then, as the holding member 22 connected to the rod 16 is lowered, the fitting member 28 is lowered, and the cylindrical pressing portion 78 located at the lower end of the fitting member 28 is placed on the upper surface of the inner ring 80 of the upper ball bearing 68. Touch

Subsequently, when the holding member 22 is lowered, the compression coil spring 34 contracts, and the fitting member 28 slides upward relative to the holding member 22. The inner ring 80 of the upper ball bearing 68 is directly pressed down by the own weight of the fitting member 28 and the compression elastic force generated by the contraction of the compression coil spring 34. The inner ring 82 of the lower ball bearing 72 is
Inner ring 80 of upper ball bearing 68, upper rolling sphere 84, upper ball bearing 6
Outer ring 70, bush 60, outer ring 7 of lower ball bearing 72
4. Pressed downward through the lower rolling sphere 86. By these pressures, the bush assembly 58 is fitted into the rotary shaft 48 as shown in FIG. The pressing force required for the fitting is set so as to correspond to the sum of the compression elastic force within a certain range generated by the compression coil spring 34 and the own weight of the fitting member 28.

When the control device 46 detects the completion of the fitting of the bush assembly 58 from the signal of the position of the fitting member 28 by the position sensor, the control device 46 sends the signal to the pneumatic cylinder device 1.
A signal for raising the rod 16 is sent to the directional control valve 4. When it is detected from the signal of the position of the fitting member 28 by the position sensor that the contraction of the compression coil spring 34 has been eliminated by the rise of the holding member 22 due to the rise of the rod 16, the control device 46 sends the direction switching valve of the pneumatic cylinder device 14. , A signal for stopping the rod 16 is sent.

In the stop state as shown in FIG.
Almost only the lower pressing force due to the weight of the fitting member 28 is loaded on the inner ring 80 of the upper ball bearing 68. Since the lower surface of the inner ring 82 of the lower ball bearing 72 is supported on the upper surface of an annular projection 88 located on the outer periphery of the base of the rotating shaft 48 in the rotor hub 42, the upper and lower ball bearings 72 are provided in the directions shown by arrows in FIG. , A force corresponding to the weight of the fitting member 28 is applied.

After a lapse of a predetermined time sufficient for the anaerobic adhesive 76 to harden, the upper and lower ball bearings 68 and 72 are set in a direction corresponding to the weight of the fitting member 28 in the direction indicated by the arrow in FIG. The position preload is applied. Of course, the magnitude of the preload can be adjusted by setting the weight of the fitting member 28. Therefore, after a certain period of time, by sending a signal for raising the rod 16 from the control device 46 to the directional control valve of the pneumatic cylinder device 14, FIG.
The spindle motor 40 in which the required preload is applied to the upper and lower ball bearings 72 is obtained. The upper and lower sides of the bush assembly 58 are supported by an appropriate jig in a state opposite to the state shown in the figure, and the rotating shaft 48 (fitted object) protruding from the rotor hub 42 is pressed from above the bush assembly 58.
Of course, it is also possible to apply a preload by fitting to the (fitted object).

In addition to the above description, appropriate modifications can be made without departing from the gist of the present invention. For example,
The position of the fitting member can be appropriately detected using various sensors and switches. Also, a suitable driving device can be used as the driving means. Further, as the control device, a relay sequence control circuit, a programmable controller, a microcomputer, and the like can be appropriately used.

[0021]

According to the preload applying device of the present invention, the fitting object is fitted to the fitting object under pressure, and an appropriate preload is applied to the fitting object after the fitting, which is smaller than the fitting pressure. Can be performed continuously and automatically through the same fitting member.

[Brief description of the drawings]

FIG. 1 is a fragmentary sectional view of a preloading device.

FIG. 2 is a sectional view of a main part of the preload applying device.

FIG. 3 is a sectional view of a main part of the preload applying device.

FIG. 4 is a sectional view of a main part of the preload applying device.

FIG. 5 is a sectional view of a main part of the preload applying device.

[Description of sign]

 14 Pneumatic cylinder device 22 Holding member 28 Fitting member 34 Compression coil spring 46 Control device 48 Rotating shaft 58 Bush assembly

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16C 25/08 B23P 19/02 B23P 21/00 301

Claims (1)

(57) [Claims] A vertically moving part, a driving means for vertically driving the vertically moving part, a fitting member supported by the vertically moving part via elastic means having compression elasticity, and After lowering the portion and fitting the fitting to the fitting under the pressure of the own weight of the fitting member and the elastic compressive force within a predetermined range by the elastic means, the elastic compressive force by the elastic means is reduced. Control means for controlling the driving means so as to raise the up-and-down moving portion so that only the pressure due to the own weight of the fitting member is substantially released and reach the fitting, and hold the position. A preload applying device, characterized in that: