JPH0734247B2 - Press-fitting method to prevent galling - Google Patents

Description

TECHNICAL FIELD The present invention relates to a press-fitting method for preventing galling by applying a small amount of lubricating oil that does not break the oil film.

[Prior art]

In the conventional rotary magnetic recording / reproducing apparatus as shown in FIG. 3, for example, the upper rotary magnetic head drum 2 is made of an aluminum alloy, and the upper drum 2 is a rotary shaft 4 for driving the upper drum 2.
It was press-fitted and fixed in.

[Problems to be Solved by the Invention]

When the upper drum 2 is press-fitted, galling easily occurs,
Press-fit load becomes very high. In order to prevent the occurrence of galling during press-fitting, for example, press-fitting oil containing trichloroethane as the main component or anti-galling agent was applied for press-fitting. The relationship between press-fitting oil containing trichloroethane as the main component and press-fitting load is shown in Fig. 2. On the street, there was no good press-fitting lubricating oil, and galling was easy to occur.

When the scuffing occurs, the shredded pieces of the drum material a and the like adhere to the tip of the shaft 4 as shown in FIG. 3 or are interposed between the drum inner hole and the shaft, so that the shaft is pressed into the center. Instead, it was eccentric, and there was the drawback that the surface of the drum was shaken.

Also, if a large amount of lubricant is applied, it mixes with the bearing oil of the bearing 12 and deteriorates the bearing oil, or it scatters and stains the drum. There was a flaw that made it worse.

In view of the above drawbacks, the present invention proposes a press-fitting method for preventing galling by selecting a press-fitting lubricating oil having characteristics such as galling prevention during press-fitting and reduction of press-fitting load.

[Means for Solving the Problems]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Applying a lubricating oil composed of a higher alcohol containing animal fat mainly containing cetyl alcohol and stearyl alcohol to a press-fitting surface formed by a press-fitting member and a press-fitted member before press-fitting. This prevents galling during press fitting.

2. In the above-mentioned claim 1, the press-fitted member is a rotary magnetic head drum or a fixed magnetic head drum of a rotary magnetic recording / reproducing apparatus, and the press-fit member is the rotary magnetic head drum or the fixed magnetic head drum. It is a shaft that is press-fitted.

〔Example〕

The present invention will be described below with reference to the illustrated embodiment. The rotary magnetic recording / reproducing apparatus for carrying out the press-fitting method for preventing galling will be described. In the digital signal recording / reproducing apparatus, an upper rotating magnetic head drum 2 for supporting and integrally rotating the rotating magnetic head 1 and this upper rotating magnetic head. Lower fixed magnetic head drum 3 which forms a tape running path with the drum 2.
And the upper rotary magnetic head drum 2 is rotated by a motor 5 formed at the lower end of a shaft 4 that supports and rotates the upper rotary magnetic head drum 2.

The motor 5 includes a rotor set including a rotor case (yoke) 6 that rotates integrally with a shaft 4 that supports and rotates the upper rotating magnetic head drum 2, and a magnet 7, and a lower fixed magnetic head drum 3. It is constituted by a stator side set including a fixed core 8 and a coil 9 wound around the core 8.

The rotary magnetic head 1 is composed of a plurality of recording heads and a plurality of reproducing heads.

Signal transmission between the rotary magnetic heads 1 and the rotary magnetic head drum 2 and a signal processing system, a recording / reproducing amplifier, or a reproducing amplifier outside the rotary magnetic head drum 2 is performed via a rotary rotary transformer 10 and a fixed rotary transformer 11 of a plane-opposing type. ing. The rotary rotary transformer 10 is fixed to the rotary magnetic head drum 2 by adhesion, and the fixed rotary transformer 11 is fixed to the fixed magnetic head drum 3 by adhesion.

The shaft 4 is rotatably supported by bearings 12a and 12b held in the center hole 3a of the fixed magnetic head drum 3.
A collar 13 is fixed to the lower end of the shaft 4 with a screw 14, and the collar 13
The rotor case (yoke) 6 is fixed by screws 15 to the.

When each of the rotary magnetic heads 1 is mounted on the rotary magnetic head drum 2, it is mounted with screws 16 and adjustment screws 17
The height is adjusted with.

A chassis 18 is fixed to the lower side of the fixed magnetic head drum 3, and a pattern substrate 19 of the frequency generator is fixed so as to face the magnet 20 fixed to the rotor case 6. Further, the core 8 is fitted to the outer periphery of the lower protruding portion 3b of the fixed magnetic head drum 3 so that the screws 21a, 2
Fixed at 1b.

When the shaft 4 which supports and rotates the rotary magnetic head drum 2 is used as a press-fitting member, when the upper end of the shaft 4 of the press-fitting member is press-fitted into the press-fitting surface 2a of the central hole of the rotary magnetic head drum 2 above the press-fitted member. The lubricating oil is applied to the press-fitting surface 2a of the central hole so as to have a slight and constant uniform film thickness, and the lubricant is press-fitted. The coating amount is, for example, a fraction of one drop of the spoid.

Lubricating oil is a lubricating oil composed of higher alcohol of animal fat containing cetyl alcohol and stearyl alcohol in appropriate ratios and some other additives, and lubricating oil composed of higher alcohol and other lubricating oils are press-fitted. The relationship of loads is as shown in FIG.

When a lubricating oil composed of a higher alcohol is used, galling is prevented, so that the press-fitting load is significantly reduced. Further, when the galling is prevented, the conventional drum material fragments a and the like do not adhere to the tip of the shaft 4, so that the shaft 4 is press-fitted into the center, is not eccentric, and the surface wobbling of the drum is eliminated.

Further, since the lubricating oil applied is small, it does not mix with the bearing oil of the bearing 12 or scatter to stain the drum, so that the recording / reproducing characteristics on the magnetic tape are improved.

In the above description, the rotary magnetic recording / reproducing apparatus in which the shaft 4 is press-fitted into the upper rotary magnetic head drum has been described. However, the shaft 4 is press-fitted into the center hole of the lower fixed magnetic head drum 3 and the upper rotary magnetic head drum is pressed. A bearing may be held in the center hole of 2 to rotate the rotary magnetic head drum, that is, the shaft 4 may be fixed and not used in a rotary magnetic recording / reproducing apparatus.

〔The invention's effect〕

Since the present invention is configured as described above, since galling is prevented, the press-fitting load is significantly reduced, and further, when galling is prevented, fragments of the drum material, etc. do not adhere to the tip of the shaft, The shaft is press-fitted in the center, does not become eccentric, and the surface of the drum does not shake. Also, since the amount of lubricating oil applied is small, it does not mix with the bearing oil of the bearings or scatter to contaminate the drum, so that it is possible to prevent galling, which has excellent effects such as improved recording / reproducing characteristics on the magnetic tape. A press-fitting method can be provided.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawings, FIG. 1 is a vertical cross-sectional front view of a rotary magnetic recording / reproducing apparatus in which a press-fitting method for preventing galling is carried out, and FIG. 2 is a lubricating oil made of higher alcohol and other lubrication. FIG. 3 is a vertical cross-sectional front view of essential parts of a rotary magnetic recording / reproducing apparatus showing a galling caused by conventional press-fitting. 2 ... Press-fitted member components, 2a ... Press-fitted surface, 4 ... Press-fitted member components.

Claims (2)

[Claims] 1. A lubricating oil comprising a higher alcohol containing animal fat containing cetyl alcohol and stearyl alcohol as main components is applied to a press-fitting surface formed by a press-fitting member and a press-fitted member before press-fitting. , Press-fitting method to prevent galling during press-fitting. 2. The press-fitted member is a rotary magnetic head drum or a fixed magnetic head drum of a rotary magnetic recording / reproducing apparatus, and the press-fit member is a shaft press-fitted to the rotary magnetic head drum or the fixed magnetic head drum. The press-fitting method for preventing galling according to claim 1 above.