JPH04133021U - Thrust bearing device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent lubricating oil from scattering to the outside in a thrust bearing device in which the thrust load of a rotating shaft is supported by a sintered oil-impregnated bearing. [Structure] A thrust washer 14 fixed to a rotating shaft 20 is arranged between opposing surfaces a and b of two sintered oil-impregnated bearings 10a and 10b arranged in the axial direction at a predetermined interval.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on a sintered oil-impregnated bearing that supports the thrust load of the rotating shaft. This is related to strike bearing devices, and is used in AV equipment such as VTR capstan motors and various other equipment. In various types of office equipment and various industrial equipment such as vertical fans such as ventilation fans, etc. can be used.

0002

[Conventional technology]

Taking the VTR capstan motor shown in FIG. 4 as an example, the capstan motor shown in FIG. The tongue motor is fixed to a rotor 4 carried on one end of a capstan 3 and a stationary member. The stator 5 is configured to rotate the capstan 3. The capstan 3 cooperates with the pinch roller 6 to feed the tape running between them. It is supported by two sintered oil-impregnated bearings 1. and, The lower sintered oil-impregnated bearing 1 is sluggish by the magnetic force of the rotor 4 and stator 5. The thrust load is applied to the end face of the sintered oil-impregnated bearing 1 and the flat washer. It is supported by the sliding contact surface with the carrier 2.

0003

[Problem that the idea aims to solve]

Thrust load is supported by sliding contact between the end face of the sintered oil-impregnated bearing 1 and the washer 2 Then, the lubricating oil impregnated inside the sintered oil-impregnated bearing 1 expands due to frictional heat. seeps to the surface. The lubricating oil 7 that has oozed out in this way is caused by centrifugal force. It scatters in the outer diameter direction (Figure 5). Particularly when used in a high temperature atmosphere, the amount of scattering is small. In many cases, lubricating oil may be insufficient, resulting in poor lubrication and increased torque. Ma In addition, in the case of bearings used in environments that dislike oil, it is necessary to suppress the scattering of lubricating oil as much as possible. Ru.

0004 Therefore, the problem that this invention aims to solve is to reduce the thrust load of the rotating shaft by sintering. To prevent lubricating oil from scattering in thrust bearing devices supported by oil bearings. Is Rukoto.

[0005]

[Means to solve the problem]

The thrust bearing device of this invention has a sintered oil-impregnated bearing that supports the rotating shaft. The thrust load is supported by the sliding contact surface with the shaft for a specified period of time. A thrust washer is placed between the opposing surfaces of two sintered oil-impregnated bearings arranged axially at a distance. It is characterized by

[0006]

[Effect]

Since the thrust bearing part is located between two sintered oil-impregnated bearings, Lubricating oil that seeps out of the sintered oil-impregnated bearing due to sliding is scattered outside due to centrifugal force. There is no. In addition, since the space between the sintered oil-impregnated bearings becomes a pool of oil, oil blown away by centrifugal force Oil collects in this cavity and does not leak into the surrounding area.

[0007]

【Example】

As shown in FIG. Place them side by side in the direction. The spacer 12 sandwiched between the sintered oil-impregnated bearings 10a and 10b Therefore, the mutually opposing surfaces a and b of the sintered oil-impregnated bearings 10a and 10b are maintained at a predetermined distance. It will be done. Note that the sintered oil-impregnated bearings 10a and 10b are fitted and fixed to the housing 18.

[0008] A thrust washer 14 is arranged between the opposing surfaces of the sintered oil-impregnated bearings 10a and 10b. thrust The washer 14 is attached to a predetermined location on the rotating shaft 20 by press-fitting, gluing, or other suitable fixing means. It is fixed. The material of the thrust washer 14 can be selected from metal, resin, etc. You can choose.

[0009] The embodiment shown in FIG. 1 is an example in which the rotation axis 20 is vertical, and in this case, the The lower end surface a of the upper sintered oil-impregnated bearing 10a of the two sintered oil-impregnated bearings 10a and 10b is It becomes the last bearing part and comes into contact with the thrust washer 14. Sintered oil-impregnated bearings 10a, 10b A cavity 16 is formed between the opposing surfaces of the thrust washer 14 and around the outer periphery of the thrust washer 14. Described later This void 16 becomes an oil sump.

0010 The embodiment shown in FIG. 2 has sintered oil-impregnated bearings 10a and 10b, as shown by thick solid lines in the same figure. The end faces c and d and the chamfer part that do not function as thrust bearing parts are blinded. This ensures that lubricant oil does not leak from these end faces. . The blinding can be performed by applying wrapping, coating, etc. child In the case of Area 16 fully functions as an oil reservoir.

[0011] In the embodiment shown in FIG. 3, a portion 12' corresponding to the spacer 12 is attached to a sintered oil-impregnated shaft as shown in the figure. It is integrally built into the receivers 10a and 10b and eliminates the spacer 12 (Figs. 1 and 2). be. Note that, like the spacer 12, the portion 12' is located on the opposing surface of the sintered oil-impregnated bearings 10a and 10b. Since it functions to maintain a predetermined interval between , various shapes other than those illustrated in the figure are possible. This example In this case, since the spacer 12 is not interposed, lubricating oil does not flow between the upper and lower sintered oil-impregnated bearings 10a and 10b. Be able to flow. As a result, (upper) sintered oil-impregnated bearing 10a → thrust sliding surface → Splashing → Oil pool (vacancy 16) → (Lower) Sintered oil-impregnated bearing 10b → (Upper) Sintered oil-impregnated bearing A lubricating oil path such as 10a is formed, and the lubricating oil can be cleaned without scattering to the outside. It can be collected in the last bearing device.

0012 All of the above embodiments have been explained using cases in which the axis of rotation is vertical, but this invention Similar implementation is possible when the rotation axis is horizontal.

[0013]

[Effect of the idea]

As mentioned above, this idea is effective in preventing the sliding between the sintered oil-impregnated bearing that supports the rotating shaft and the washer. Two sintered oil-impregnated shafts are used to support thrust loads on dynamic contact surfaces. Since a thrust washer is placed between the receivers, it has the following effects. . Since the thrust bearing part is located between two sintered oil-impregnated bearings, the thrust bearing part Lubricating oil that seeps out of the sintered oil-impregnated bearing due to sliding is scattered outside due to centrifugal force. There is no. In addition, since the space between the sintered oil-impregnated bearings becomes a pool of oil, oil blown away by centrifugal force The oil collects in this cavity and does not leak into the surrounding area. Therefore, lubricating oil spillage This can be prevented and the life of the bearing can be extended.

[0014] Furthermore, in the conventional models shown in Figs. 4 and 5, the rotation axis is When used with a According to the proposal, the thrust washer would be located between the opposing surfaces of two sintered oil-impregnated bearings. , the superior effect of being able to support bidirectional thrust loads is obtained. In particular, if the stator and rotor are radially opposed motors, To simplify the measurement, the rotor can be supported in either direction during drive. It is desirable to do so.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of this invention.

FIG. 2 is a vertical cross-sectional view of the main parts of the second embodiment.

FIG. 3 is a longitudinal cross-sectional view of the main part showing a third embodiment.

FIG. 4 is a vertical cross-sectional view of a VTR capstan motor showing a conventional example.

FIG. 5 is an enlarged sectional view of the thrust bearing device portion of FIG. 4;

[Explanation of symbols]

10a, 10b Sintered oil-impregnated bearing 12 spacer 14 Thrust washer 16 Vacant space (oil sump) 18 Housing 20 Rotation axis

Claims (1)

[Scope of utility model registration request] Claim 1: In a device in which the thrust load of a rotating shaft is supported by a sintered oil-impregnated bearing, a thrust load fixed to the rotating shaft is placed between opposing surfaces of two sintered oil-impregnated bearings arranged in the axial direction at a predetermined interval. Sintered oil-impregnated bearing device with washer.