JP2543254Y2 - Thrust bearing 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 bearing device using a sintered oil-impregnated bearing.
It can be used in equipment, office equipment, industrial equipment, and the like.

[0002]

2. Description of the Related Art A VTR capstan motor shown in FIG. 8 will be described as an example.
The capstan 3 is constituted by a rotor 4 carried on one end of the placed capstan 3 and a stator 5 fixed to a stationary member, and drives the capstan 3 to rotate. The capstan 3 works in cooperation with the pinch rollers 6 to feed the tape running between them, and is supported by a pair of upper and lower sintered oil-impregnated bearings 1. A thrust load is applied to the lower sintered oil-impregnated bearing 1 by the magnetic force of the rotor 4 and the stator 5, and the thrust load is reduced by the lower end face of the sintered oil-impregnated bearing 1 and the upper end of the flat washer 2.
Supported by sliding contact with the surface .

[0003]

When the thrust load is supported by the sliding contact between the lower end surface of the sintered oil-impregnated bearing 1 and the upper end surface of the washer 2, the heat of the friction of the sintered oil-impregnated bearing 1 is increased. The lubricating oil impregnated inside expands and oozes out from the lower end surface . In addition, the lower end face is in sliding contact with the washer 2.
Lubricating oil oozing out due to
Lubricating oil that has moved. Lubricating oil impregnated inside the bearing,
Lubricating oil that seeps onto the sliding surface (bearing surface) with the rotating shaft is gravity
Causes a phenomenon of moving downward.過
A quantity of lubricating oil is supplied . And this oversupplied
The lubricating oil 7 scatters in the outer diameter direction due to the centrifugal force (FIG. 9).
reference). In particular, when used in a high-temperature atmosphere, the amount of scattering is large, lubricating oil may be insufficient, lubrication may be poor, and torque may increase. In addition, in the case of bearings used in an environment where oil is unfavorable, such as information and office equipment, it is necessary to minimize scattering of lubricating oil.

[0004] In the thrust bearing device having the above structure,
Since the thrust load is supported by the sliding contact between the end face of the sintered oil-impregnated bearing 1 and the washer 2, when the thrust load increases, the torque necessarily increases.

Therefore, an object of the present invention is to prevent the lubricating oil from scattering from the sintered oil-impregnated bearing and to reduce the torque.

[0006]

Thrust bearing device of the present invention SUMMARY OF THE INVENTION may, the thrust load from the oil-impregnated sintered bearing rotatably supporting the rotary shaft that is Tatejiku placed, from below collar fixed to the rotating shaft A thrust bearing device for supporting,
Lower end face of sintered oil-impregnated bearing and upper side of collar facing it
An annular rolling groove is formed at least on the upper end surface of the collar among the end faces, and a plurality of balls arranged in the rolling groove form a ball.
The lower end surface of the sintered oil-impregnated bearing is supported by rolling from below . Here, "At least above the collar
On the end face, a rolling groove was formed only on the upper end face of the collar
In addition to the configuration, the upper end face of the collar and the lower end face of the sintered oil-impregnated bearing
It is intended to include a configuration in which rolling grooves are formed in both of them .

[0007]

The thrust load applied to the rotating shaft is formed on at least the upper end surface of the collar via the sintered oil-impregnated bearing.
The lower part is caused by the balls arranged in the
Rolling is supported. The ball is guided by rolling in an annular rolling groove, and supports a thrust load while being in rolling contact with the lower end surface of the sintered oil-impregnated bearing. Since the amount of heat generated at the contact portion is reduced by the ball supporting the lower end surface of the oil-impregnated sintered bearings while rolling the rolling in grooves, the lower oil-impregnated sintered bearing
The amount of seepage of lubricating oil from the end face is reduced. Then, the lubricating oil etc. slightly oozing out from the lower end surface of the sintered oil-impregnated bearing
It is collected in an annular rolling groove formed on the upper end surface of the collar and performs lubrication of the ball. Thus, the sintered oil-impregnated bearing
The amount of lubricating oil that oozes from the lower end face of the collar itself decreases, and the oozing lubricating oil etc. forms on the upper end face of the collar.
Since the oil is collected by the formed annular rolling grooves, the amount of lubricating oil scattered outside the bearing device is reduced. Further, since the support structure for the thrust load is changed from the conventional sliding contact to the rolling contact, the torque can be reduced.

[0008]

Embodiments of the present invention will be described below.

As shown in FIG. 1, the thrust bearing device of the present invention comprises a collar 1 fixed to a rotating shaft 13 disposed vertically.
An annular rolling groove 12a is formed in the upper end face of the bearing 2 and a plurality of balls 15 arranged in the rolling groove 12a are used to make the sintered oil-impregnated bearing 11
The lower end face is supported by rolling from below .

The sintered oil-impregnated bearing 11 is fitted with the outer diameter portion wrapped in the housing 16 and rotatably supports the rotating shaft 13. The sintered oil-impregnated bearing 11 is made of an iron-based sintered material, and preferably has an iron content of 80% or more. As a lubricating oil, an ester synthetic lubricant whose viscosity grade is equivalent to ISOVG68 is impregnated.

[0011] a plurality of balls 15 are rolling guide the annular rolling groove 12a, to <br/> support the lower end surface of the oil impregnated sintered bearing 11 from below. Since the ball 15 makes rolling contact with the lower end surface of the sintered oil-impregnated bearing 11, the amount of heat generated at the contact portion decreases,
The amount of seepage of lubricating oil from this portion is reduced. Then, lubricating oil or the like slightly oozing out from the lower end surface of the sintered oil-impregnated bearing 11 is collected in the annular rolling groove 12a, and the ball 15
It has a lubricating effect. Further, the rolling contact of the ball 15 reduces the torque. For example, 80 ⁰ if C or more thrust load under a high temperature atmosphere of 1 kgf, 8 and 9
In the support structure of the washer 2 shown in (1), the temperature rise of the sintered oil-impregnated bearing becomes large due to the heat generated in the sliding portion, and the lubrication oil deteriorates, and in about 100 hours, lubrication failure occurs and the torque may increase. On the other hand, the ball support structure of the present invention shows stable low torque characteristics for a long time of 1000 hours or more.

The collar 12 is formed of a resin material such as a sintered oil-impregnated material or an engineering plastic material in addition to a steel material such as a bearing steel. By forming the collar 12 from a sintered oil-impregnated material, mass productivity can be improved and the lubrication function of the ball 15 in the rolling groove 12a can be increased. In addition, color 12
Is formed of a resin material such as an engineering plastic material, thereby improving mass productivity and reducing noise during rotation. As shown in FIG. 2, a means for interposing a resin ball 15b between steel ball balls 15a is also effective in reducing noise.

FIG. 3 shows an embodiment in which an oil recovery groove 12b is formed near the entrance of the rolling groove 12a. Oil recovery groove 12b
Are formed on the outer diameter side wall surface of the rolling groove 12a,
The lubricating oil or the like that oozes out from the contact portion between the ball 15 and the lower end surface of the sintered oil-impregnated bearing 11 and is scattered in the outer diameter direction is recovered and supplied to the rolling groove 12a. By forming the oil recovery groove 12b, the effect of preventing the lubricating oil from scattering is further improved.

FIG. 4 shows a step 12 on the upper end face of the collar 12.
An example is shown in which a solid lubricant 17 such as felt, plastic grease, or an oil-impregnated resin is formed on the step portion 12c, and the lubricating oil is impregnated. By arranging the solid lubricant 17, the amount of oil retention increases, so that the ball rolls more smoothly. Further, the lubricating oil which is going to scatter in the outer diameter direction hits the stepped portion 12c and the rolling groove 12a
The lubricating oil is also effectively dispersed.

FIG. 5 shows that the collar 12 is formed of a resin, a rubber material or the like, and the width W1 and the depth W2 of the rolling groove 12a are defined as W1 <D (D: ball diameter) D / 2 <W2 < An example set in the range of D is shown. Ball 15 is rolling groove 1
The entrance portion 2a is pushed into the rolling groove 12a while being elastically pushed open. Compared to the configuration shown in FIG.
The lubricating oil holding function of 2a becomes higher. Ball 1
There is no need to worry about the dropping of 5 and so on.

FIG. 6 shows an embodiment in which a rolling groove 11a is formed on the lower end face of the sintered oil-impregnated bearing 11 in addition to the configuration shown in FIG. As the surface pressure at the contact portion between the sintered oil-impregnated bearing 11 and the ball 15 decreases, the amount of heat generated at the contact portion decreases.

FIG. 7 shows an embodiment in which a flat collar 12 is used and a rolling groove 11a is formed only on the end face of the sintered oil-impregnated bearing 11. As in the case shown in FIG. 6, the contact pressure at the contact portion is reduced, and the processing of the collar 12 is facilitated, so that the cost is reduced. In order to prevent the lubricating oil from scattering in the outer diameter direction, an outer wall 12d may be provided on the outer diameter side end surface of the collar 12, as shown in FIG.

Although the embodiment described above relates to a vertical thrust bearing device, the present invention is not limited to this. For example, a horizontal thrust bearing used for a cooling fan motor of a radiator of an automobile or the like. The present invention can also be applied to a device, and in that case, a similar effect can be obtained.

[0019]

[Effects of the Invention] As described above, according to the present invention,
The thrust load by supporting the rolling contact of the balls, to reduce the amount oozing of the lubricating oil from the lower end surface of the oil impregnated sintered bearing, further color lubricating oil or the like out the bleeding
The lubricating oil is scattered less than the conventional one because it is collected by an annular rolling groove formed on the upper end face of
Also, the torque is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (FIG. 1A) showing an embodiment of the present invention, and a plan view (FIG. 1B) showing an end face of a collar.

FIG. 2 is a plan view showing an end face of a collar according to another embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a sectional view showing another embodiment of the present invention.

FIG. 8 is a sectional view showing a structure of a VTR capstan motor.

FIG. 9 is a sectional view showing a conventional thrust bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Sintered oil-impregnated bearing 12 Collar 12a Rolling groove 13 Rotating shaft 15 Ball

Claims (1)

(57) [Scope of request for utility model registration] 1. A thrust bearing device wherein a thrust load from a sintered oil-impregnated bearing rotatably supporting a rotating shaft arranged vertically is supported from below by a collar fixed to the rotating shaft. The lower end face of the oil-impregnated bearing and the collar facing it
At least the upper end face of the collar
An annular rolling groove is formed in the rolling groove, and a plurality of
The lower end surface of the sintered oil-impregnated bearing from below.
A thrust bearing device characterized by being supported by rolling .