JPH10311331A - Thrust bering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust bearing of high reliability, whereby thrust wearing powder generated in a thrust slide surface is prevented from infiltrating in a dynamic pressure fluid bearing, and extending of a life of a motor can be attained. SOLUTION: In a dynamic pressure fluid bearing 2, a bearing side thrust washer 7 is provided, which has a protruded part 6 preventing thrust wearing powder from infiltrating in a radial bearing side. A rotary shaft side thrust washer 16, which is provided with a recessed pat 15 accumulating thrust wearing powder in a position opposing the protruded part 6 provided in the bearing side thrust washer 7, is pressed through a spring washer 14. By bringing a thrust slide surface 17 to the bearing side thrust washer 7 into contact by pressing force of the spring washer 14 when a rotary shaft is stopped, thrust wearing powder is prevented from dropping in a surface side of the rotary shaft, and extending of a life can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thrust bearing provided with a hydrodynamic bearing used for a motor.

[0002]

2. Description of the Related Art In recent years, the use of hydrodynamic bearings in motors such as ventilation fans has become widespread, and thrust bearings having a configuration in which abrasion powder generated on a thrust sliding surface does not enter the hydrodynamic bearing. Demands are growing.

Conventionally, as this type of thrust bearing, those shown in FIGS. 4 and 5 have been known. Hereinafter, the configuration will be described with reference to FIGS. 4 and 5.

[0004] As shown in the figure, the outer periphery is formed in a spherical shape,
A substantially V-shaped dynamic pressure generating groove 101 is formed on the inner periphery by rolling.
Is formed, and a centering spring 104 for pressing the other of the outer periphery of the hydrodynamic bearing 102 toward the bearing case 103 is provided to form the bearing portion 105.

A bearing portion 105 is provided at a bearing portion of a motor case 107 that houses the stator 106, and a metal washer 110 for adjusting thrust and a washer 111 made of resin are provided on a rotating shaft 109 provided with a rotor 108. Are mounted, and the rotating shaft 109 is mounted on the dynamic pressure generating groove 101 with lubricating oil.
And was rotatably supported.

In the above configuration, when the rotating shaft 109 is rotated by operating the motor, the lubricating oil in the dynamic pressure generating groove 101 is pressurized by the pumping action, and the rotating shaft 109 is rotated while floating by the oil film.

[0007]

In such a conventional thrust bearing, the motor is operated and the rotating shaft 1 of the motor is driven.
When the rotating shaft 09 rotates, the end face of the hydrodynamic bearing 102 slides with the washer 111 made of resin or the like to generate abrasion powder, and the abrasion powder penetrates into the hydrodynamic bearing 102 and the durability of the motor increases. There was a problem that was damaged.

The present invention solves the above-mentioned problems, and prevents the thrust abrasion powder generated on the thrust sliding surface from invading the hydrodynamic bearing, thereby extending the life of the motor. It is an object of the present invention to provide a highly thrust bearing.

[0009]

SUMMARY OF THE INVENTION In a thrust bearing according to the present invention, a hydrodynamic bearing having a dynamic pressure generating groove, supported by a bearing case and an aligning spring, and a thrust wear provided on the hydrodynamic bearing. A bearing-side thrust washer having a projection for preventing powder from entering the radial bearing side;
A rotating shaft-side thrust washer provided with a concave portion for storing thrust abrasion powder at a position where the convex portion provided on the bearing-side thrust washer is opposed, and interposed between the rotating shaft-side thrust washer and an E-ring provided on the rotating shaft. A spring washer is provided, and the thrust sliding surfaces of the bearing-side thrust washer and the rotating shaft-side thrust washer are brought into contact by the pressing force of the spring washer when the rotating shaft stops.

According to the present invention, there is provided a highly reliable thrust bearing capable of preventing wear powder generated on the thrust sliding surface from entering the hydrodynamic bearing and extending the life of the motor. can do.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention has a hydrodynamic bearing having a dynamic pressure generating groove, supported by a bearing case and an aligning spring, and provided in the hydrodynamic bearing. A bearing-side thrust washer having a protrusion for preventing the thrust wear powder from entering the radial bearing side, and a recess for storing the thrust wear powder at a position where the protrusion provided on the bearing-side thrust washer faces. The rotating shaft-side thrust washer provided, and a spring washer interposed between the rotating shaft-side thrust washer and the E-ring provided on the rotating shaft, and a thrust sliding surface of the bearing-side thrust washer and the rotating shaft-side thrust washer is provided. When the rotating shaft is stopped, the contact is made by the pressing force of the spring washer. When the rotating shaft is rotating, the friction generated on the thrust sliding surface is reduced. The powder is released from the thrust sliding surface by centrifugal force, and even if some of the abrasion powder moves to the rotating shaft side, it is received by the convex part provided on the bearing side thrust washer, and the rotating shaft thrust washer When the rotating shaft stops, the thrust sliding surface comes into contact with the pressing force of the spring washer, preventing the abrasion powder from dropping on the rotating shaft surface, and a hydrodynamic bearing. It has the function of preventing intrusion into the inside.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) As shown in FIGS. 1 and 2, one of the outer circumferences of a hydrodynamic bearing 2 having a hydrodynamic groove 1 is received by a cylindrical bearing case 3 and the other is placed on the bearing case 3 side. An axial spring 4 to be pressed is provided, a bearing portion 5 is formed, and a bearing-side thrust washer 7 having a convex portion 6 for preventing thrust abrasion powder from entering the radial bearing side into the hydrodynamic bearing 2 is provided. Bearing part 1 of motor case 9 housed in stator 8
The bearing part 5 is attached to the position No. 0.

An E-ring 13 is provided on the rotating shaft 12 on which the rotor 11 is provided, and a spring washer 14 received by the E-ring 13 and a convex portion provided on the bearing-side thrust washer 7 adjacent to the spring washer 14. A rotating shaft-side thrust washer 16 having a recess 15 for collecting thrust wear powder is provided at a position facing the thrust abrasion powder 6 and mounted on the bearing portion 10 to form a motor.

In the above configuration, when the rotating shaft 12 rotates, the fixed bearing-side thrust washer 7 and the rotating shaft-side thrust washer 1 provided on the rotating shaft 12 and rotated.
Even if thrust abrasion powder is generated on the thrust sliding surface 17 of 6, the centrifugal force of the rotating shaft-side thrust washer 16 is released to the outside, and even if a small amount of thrust abrasion powder moves to the rotating shaft 12 side, for example, The thrust washer is received by the convex portion 6 provided on the bearing-side thrust washer 7 and accumulates in the concave portion 15 provided on the rotating shaft-side thrust washer 16. When the rotating shaft 12 stops, the thrust sliding surface is pressed by the spring washer 14. 17 is in a contact state, so that thrust abrasion powder does not fall on the surface of the rotating shaft 12.

As described above, according to the thrust bearing of the first embodiment of the present invention, the dynamic thrust bearing 2 has the bearing-side thrust washer 7 having the convex portion 6 for preventing the thrust wear powder from entering the radial bearing side. A thrust washer 16 having a concave portion 15 for accumulating thrust abrasion powder at a position facing the convex portion 6 provided on the bearing-side thrust washer 7 is pressed via a spring washer 14 to thereby provide a bearing-side thrust washer. When the rotary shaft 12 is stopped, the thrust sliding surface 17 is brought into contact with the thrust sliding surface 17 by the pressing force of the spring washer 14, so that thrust abrasion powder is prevented from dropping on the rotary shaft 12 surface side. And a longer life can be achieved.

(Embodiment 2) As shown in FIG. 3, a bearing-side thrust washer 7A provided in the hydrodynamic bearing 2
A wear powder receiving groove 18 is provided on the rotating shaft 12A opposite to the thrust sliding surface 17 of the rotating shaft side thrust washer 16A, and the rotating shaft side thrust washer 16A and the rotating shaft 12A are provided.
A rubber washer 19 and a nylon washer 20 are provided between the E-ring 13 and the E-ring 13.

In the above structure, when the rotating shaft 12A rotates, the thrust sliding surface 17 between the fixed bearing-side thrust washer 7A and the rotating rotating shaft-side thrust washer 16A provided on the rotating shaft 12A causes thrust wear. Even if powder is generated, the thrust washer 16 on the rotating shaft side
A, even if a small amount of thrust abrasion powder moves to the rotating shaft 12A side due to the centrifugal force of A, it is received by the abrasion powder receiving groove 18 formed in the rotating shaft 12A, and the rotating shaft 1
When 2A stops, the thrust sliding surface 17 opens,
The thrust wear powder is dropped to the outside.

As described above, according to the thrust bearing of the second embodiment of the present invention, the rotary shaft 1 with respect to the thrust sliding surface 17 is provided.
Since the abrasion powder receiving groove 18 is formed on the 2A, the thrust abrasion powder generated on the thrust sliding surface 17 is discharged to the outside by centrifugal force, and even if a small amount of the thrust abrasion powder moves to the rotating shaft 12A surface side, the abrasion powder is removed. Hydrodynamic bearing 2 received by pan 18
Is prevented from entering the inside. Further, when the rotating shaft 12A is stopped, the sliding surface is opened, and the remaining wear powder is discharged to the outside.

[0019]

As is clear from the above embodiment,
According to the present invention, a bearing-side thrust washer having a convex portion for preventing thrust abrasion powder provided on the hydrodynamic bearing from entering the radial bearing side, and a convex portion provided on the bearing-side thrust washer are provided. The rotating shaft side thrust washer provided with a concave portion for accumulating thrust abrasion powder at the opposing position and the spring washer interposed between the rotating shaft side thrust washer and the E-ring provided on the rotating shaft are provided. An object of the present invention is to provide a highly reliable thrust bearing capable of preventing generated thrust abrasion powder from entering a hydrodynamic bearing and extending the life of a motor.

A wear powder receiving groove provided on the rotating shaft facing the thrust sliding surface of the bearing-side thrust washer and the rotating shaft-side thrust washer, and an E-ring provided between the rotating shaft-side thrust washer and the rotating shaft. Is provided with a washer made of rubber, nylon, or the like, so that even if the thrust abrasion powder moves to the rotating shaft surface side, the thrust abrasion powder can be received by the abrasion powder receiver and prevented from entering the hydrodynamic bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thrust bearing according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a motor equipped with the thrust bearing.

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

FIG. 4 is a schematic sectional view of a motor equipped with a conventional thrust bearing.

FIG. 5 is a sectional view of the thrust bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dynamic-pressure generating groove 2 Dynamic-pressure fluid bearing 3 Bearing case 4 Alignment spring 6 Convex part 7 Bearing-side thrust washer 7A Bearing-side thrust washer 12 Rotary shaft 12A Rotary shaft 13 E-ring 14 Spring washer 15 Recess 16 Rotary shaft-side thrust washer 16A Thrust washer on the rotating shaft side 17 Thrust sliding surface 18 Wear powder receiving groove 19 Rubber washer 20 Nylon washer

Claims (2)

[Claims] A dynamic pressure generating bearing having a dynamic pressure generating groove and supported by a bearing case and an aligning spring, and a thrust abrasion powder provided in the dynamic pressure fluid bearing entering a radial bearing side. A bearing-side thrust washer having a convex portion for preventing the rotation, a rotary shaft-side thrust washer having a concave portion for accumulating thrust wear powder at a position where the convex portion provided on the bearing-side thrust washer is provided, and a rotary shaft-side thrust. A spring washer interposed between the washer and an E-ring provided on the rotating shaft, wherein the thrust sliding surfaces of the bearing-side thrust washer and the rotating shaft-side thrust washer are brought into contact by the pressing force of the spring washer when the rotating shaft is stopped. A thrust bearing that is configured to 2. A dynamic pressure fluid bearing having a dynamic pressure generating groove and supported by a bearing case and an aligning spring, and thrust sliding of a bearing-side thrust washer and a rotary shaft-side thrust washer provided in the dynamic pressure fluid bearing. A wear powder receiving groove provided on the rotating shaft facing the surface, a rubber or nylon washer interposed between the rotating shaft side thrust washer and an E-ring provided on the rotating shaft, and when the rotating shaft is stopped. A thrust bearing, wherein the thrust sliding surface is opened to discharge wear powder to the outside.