JPH1172114A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device which does not cause ageing by forming a delta-shaped tapered face which corresponds to a shaft diameter on an inside diameter face of a bearing abutting to a rotary shaft. SOLUTION: A rotor 2 is integrated with a capstan shaft 1. Concentric bearings 4a, 4b are pressed in at a predetermined interval above and below a bearing housing 3. A chassis 5 holds the bearing housing 3. Delta-shaped tapers 24a1, 24b1 which correspond to a diameter of a rotary shaft 1 are formed on an inside diameter face of the bearings 24a, 24b. Torque loss is reduced due to abutting of the rotary shaft 1 with the delta-shaped tapers 24a1, 24b1 by side pressure P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capstan motor used for a VTR or a tape recorder, which has a plurality of bearings, and in which a rotating shaft receives a side pressure outside these bearings. It is.

[0002]

2. Description of the Related Art In recent years, motors have a small loss torque, a long life,
There is a demand for stable low power consumption, which is disclosed in Japanese Utility Model Laid-Open Publication No. 3-73721 in which the inner diameter surface of the bearing is tapered outward so as to match the inclination due to the side pressure of the rotating shaft. ing.

FIG. 6 shows a sectional view of a capstan motor of a conventional bearing device. When the capstan shaft 51 receives a side pressure outside of the space between the bearings, the capstan shaft 51 and the bearings 54a, 54b extend over the entire length of the tapered inner diameter surface.
The contact is made in a large area of 54b, so that the surface pressure is reduced and a good conforming surface is formed. 52 is a rotor, 53 is a housing, 55 is a chassis, and 56 is a thrust receiver.

[0004]

In this bearing device, a good conforming surface is formed to reduce the loss torque, increase the life,
Stable low power consumption is required.

In particular, there is a strong demand for eliminating the step of forcibly contacting the rotating shaft with the bearing and rotating the rotating shaft for a certain period of time and aging in order to form a good conforming surface between the rotating shaft and the bearing.

However, in the above-mentioned conventional method, even if a taper is added to the inner diameter surface of the bearing, the conforming surface is formed with respect to the diameter of the rotating shaft, and there is a problem with aging less.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide an agingless bearing device.

[0008]

In order to solve this problem, the present invention has a structure in which a delta-shaped taper corresponding to a shaft diameter is provided at a position where a rotating shaft comes into contact with a bearing inner diameter portion by a side pressure. .

According to this configuration, a conforming surface with respect to the shaft diameter is already prepared, so that even if the rotating shaft comes into contact with the inner diameter surface due to the side pressure, the function of conforming is not required, and
It is possible to realize an agingless bearing device with low loss torque and low power consumption from the time of contact.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a bearing device comprising a plurality of bearings for supporting a rotating shaft, and wherein the rotating shaft receives a side pressure outside the bearing. When the output side of the bearing receives a side pressure, the rotating shaft has a delta-shaped taper corresponding to the diameter of the rotating shaft at the bearing inner diameter abutting portion, and has an effect of realizing an agingless bearing device. Have.

According to a second aspect of the present invention, the inner diameter of at least one bearing is formed in a delta taper, and has an effect of realizing an agingless bearing device.

The third aspect of the present invention has the effect of realizing an agingless bearing device by forcibly forming the delta-shaped taper with a bar having the same diameter on the rotating shaft by a rotational sizing method.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a motor structure on which a bearing device of the present invention is mounted, and FIG. 2 is a cross-sectional view in which a rotating shaft is in contact with a bearing inner diameter portion.

1 is a capstan shaft, 2 is a rotor integrated with the capstan shaft 1, 3 is a bearing housing, 4a, 4
Reference numeral b denotes a concentric bearing press-fitted into the bearing housing 3 at predetermined intervals, 5 denotes a chassis holding the bearing housing 3, and inner diameter surfaces of the bearings 24a and 24b have a delta shape corresponding to the diameter of the rotating shaft. Tapers 24a1, 24b1
Are formed. The rotating shaft 1 is configured to contact the delta-shaped tapers 24a1 and 24b1 by the side pressure P to reduce the loss torque.

(Embodiment 2) FIG. 3 shows a bearing structure on which a bearing device of the present invention is mounted, and FIG. 4 is a cross-sectional view in which a rotating shaft is in contact with a bearing inner diameter portion.

Reference numeral 31 denotes a sizing bar having the same diameter as the rotating shaft;
Is a bearing housing, 34a and 34b are concentric bearings press-fitted into the bearing housing 33 vertically at predetermined intervals, the sizing bar 31 is rotated at a predetermined high speed, and the bearing housing 33 has a predetermined force F in a direction to receive a side pressure in advance. , It is configured to be pressed by the sizing bar 31. Accordingly, the pressed contact portions 3a1 and 3b1 form a delta-shaped taper of 44a1 and 44b1 shown in FIG. 4 and constitute a bearing that does not require aging.

FIG. 5 shows the conforming characteristics of the conventional product and the product of the present invention. The product of the present invention does not require aging.

[0019]

As described above, according to the present invention, an aging-less bearing device can be realized by forming a delta-shaped tapered surface corresponding to the shaft diameter on the bearing inner diameter surface in contact with the rotating shaft. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a bearing according to an embodiment of the present invention.

FIG. 3 is a sectional view of a bearing according to the embodiment of the present invention.

FIG. 4 is a sectional view of a bearing according to the embodiment of the present invention.

FIG. 5 is a diagram showing a shaft loss characteristic according to the embodiment of the present invention.

FIG. 6 is a sectional view of a motor of a conventional bearing device.

[Explanation of symbols]

1,31,51 Rotating shaft 2,52 Rotor 3,33,53 Housing 4a, 4b, 24a, 24b, 34a, 34b, 44
a, 44b, 54a, 54b Bearings 24a1, 24b1, 44a1, 44b1 Delta-shaped taper 5, 55 Chassis 6, 56 Thrust receiver

Claims (3)

[Claims] 1. A bearing device comprising a plurality of bearings for supporting a rotating shaft, wherein the rotating shaft receives a side pressure outside the bearing, wherein the bearing rotates when an output side of the bearing receives the side pressure. A bearing device in which a shaft forms a delta-shaped taper corresponding to the outer diameter of a rotating shaft in a bearing inner diameter contact portion. 2. The bearing device according to claim 1, wherein the inner diameter of at least one bearing is formed as a delta taper. 3. A bearing device comprising a plurality of bearings for supporting a rotating shaft, wherein the rotating shaft receives a side pressure outside the bearing, wherein the bearing rotates when an output side of the bearing receives the side pressure. A bearing device in which a shaft is subjected to rotational sizing in a direction in which a side pressure is received in advance by a bar having a diameter corresponding to the outer diameter of the rotating shaft at a bearing inner diameter contact portion.